Patent Publication Number: US-2016238751-A1

Title: Light-diffusing member, method for manufacturing the same, and display device

Description:
TECHNICAL FIELD 
     The present invention relates to a light-diffusing member, a method for manufacturing the same, and a display device. 
     The present application claims priority to Japanese Patent Application No. 2013-142009 filed in the Japanese Patent Office on Jul. 5, 2013, the disclosure of which is herein incorporated by reference in its entirety. 
     BACKGROUND ART 
     A liquid crystal display device has been widely used as a display of a mobile electronic device including a mobile phone, a television, or a personal computer. Incidentally, it has been generally known in the past that the liquid crystal display device has excellent visual perception properties from a front surface but has a narrow viewing angle, and various studies for widening the viewing angle have been performed. As one study, it is considered that a member (hereinafter, referred to as a light-diffusing member) for diffusing light emitted from a display member of a liquid crystal panel is provided on a visual perception side of the display member. 
     For example, PTL 1 describes a viewing angle widening film that includes a sheet main member and a plurality of substantially wedge-shaped portions which is buried on an emission surface within the sheet main member and becomes wider toward the emission surface. In the viewing angle widening film, the side surface of the substantially wedge-shaped portion is provided with polygonal surfaces, and an angle formed by a vertical line of an incident surface and the polygonal surface of the side surface becomes larger toward the emission surface. In the viewing angle widening film, since the side surface of the substantially wedge-shaped portion has such a configuration, light vertically incident on the incident surface is totally reflected on the side surfaces multiple times, and thus, a diffusing angle becomes larger. 
     CITATION LIST 
     Patent Literature 
     PTL 1: Japanese Unexamined Patent Application Publication No. 2005-157216 
     SUMMARY OF INVENTION 
     Technical Problem 
     In a case where the viewing angle widening film described in PTL 1 is manufactured, it is extremely difficult to form the substantially wedge-shaped portions having the side surfaces provided with the plurality of polygonal surfaces on the sheet main member. There is an inconvenience of filling the substantially wedge-shaped portions with UV curable resin without gaps after the substantially wedge-shaped portions are formed on the sheet main member, and a manufacturing process is complicated. If a problem such as a case where the inclined angle of the polygonal surface is not accurately formed or a case where the substantially wedge-shaped portions are not sufficiently filled with the resin occurs, there is a problem that desired light-diffusing performance is not obtained. 
     An aspect of the present invention has been made in view of the above-described circumstances, and it is an object of the present invention to provide a method for manufacturing a light-diffusing member capable of achieving a desired light-diffusing function without complicating a manufacturing process. It is also an object of the present invention to provide a light-diffusing member manufactured by the method for manufacturing a light-diffusing member. It is also an object of the present invention to provide a display device including the light-diffusing member with excellent display quality. 
     Solution to Problem 
     According to an aspect of the present invention, there is provided a method for manufacturing a light-diffusing member. The manufacturing method includes: a process of forming a light shielding layer on one surface of a substrate having light transparency; a process of forming a negative photosensitive resin layer having light transparency on the one surface of the substrate so as to cover the light shielding layer; a process of exposing the negative photosensitive resin layer by irradiating the negative photosensitive resin layer with parallel light of ultraviolet light diagonally with respect to a normal direction of the one surface of the substrate from a surface opposite to the one surface of the substrate on which the light shielding layer and the negative photosensitive resin layer are formed in at least one direction through a region of the substrate other than a region where the light shielding layer is formed; and a process of forming a light-diffusing section, which includes a light emission end surface on a side close to the substrate and a light incident end surface having an area greater than an area of the light emission end surface on a side opposite to the substrate, on the one surface of the substrate by developing the exposed negative photosensitive resin layer. 
     In the method for manufacturing a light-diffusing member according to the aspect of the present invention, it is preferable that the negative photosensitive resin layer is irradiated with the parallel light diagonally with respect to the normal direction of the one surface of the substrate in two or more different directions. 
     In the method for manufacturing a light-diffusing member according to the aspect of the present invention, it is preferable that angles of the parallel light applied in two or more different directions with respect to the normal direction of the one surface of the substrate are different from each other. 
     In the method for manufacturing a light-diffusing member according to the aspect of the present invention, it is preferable that the negative photosensitive resin layer is irradiated with the parallel light diagonally with respect to the normal direction of the one surface of the substrate in at least one direction and the negative photosensitive resin layer is irradiated with the parallel light in parallel with the normal direction of the one surface of the substrate. 
     In the method for manufacturing a light-diffusing member according to the aspect of the present invention, it is preferable that an angle of the applied parallel light with respect to the normal direction of the one surface of the substrate is controlled by the arrangement of the substrate and a light source which emits the parallel light. 
     In the method for manufacturing a light-diffusing member according to the aspect of the present invention, it is preferable that the light source includes a plurality of surface light sources and the plurality of surface light sources is arranged in different directions from one another with respect to the normal direction of the one surface of the substrate. 
     In the method for manufacturing a light-diffusing member according to the aspect of the present invention, it is preferable that the light source includes a line light source and the line light source is moved in the normal direction of the one surface of the substrate. 
     In the method for manufacturing a light-diffusing member according to the aspect of the present invention, it is preferable that a prism is disposed so as to face the substrate, and the angle of the applied parallel light with respect to the normal direction of the one surface of the substrate is controlled by refracting the parallel light emitted from a light source by the prism. 
     A light-diffusing member according to another aspect of the present invention may be manufactured by the method for manufacturing a light-diffusing member according to the aspect of the present invention. 
     A display device according to still another aspect of the present invention may include the light-diffusing member according to the aspect of the present invention. 
     Advantageous Effects of Invention 
     According to the aspect of the present invention, it is possible to provide a method for manufacturing a light-diffusing member capable of achieving a desired light-diffusing function without complicating a manufacturing process. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a schematic configuration diagram showing an example of an apparatus for manufacturing a light-diffusing member used in a method for manufacturing a light-diffusing member of the present embodiment. 
         FIG. 2  is a schematic configuration diagram showing a first embodiment of an exposure device. 
         FIG. 3  is a graph showing distribution characteristics of parallel light. 
         FIG. 4  is a diagram showing the relationship between an inclined angle of a substrate and an inclined angle (incident angle) of parallel light with respect to a normal line of the substrate. 
         FIG. 5  is a diagram showing the refraction of parallel light incident on the substrate. 
         FIG. 6  is a graph showing the relationship between an inclined angle of the substrate and a taper angle of a light-diffusing section. 
         FIG. 7  is a diagram showing the refraction of parallel light incident on the substrate. 
         FIG. 8  is a schematic sectional view showing an embodiment of the light-diffusing member. 
         FIG. 9  is a schematic configuration diagram showing a second embodiment of the exposure device. 
         FIG. 10  is a schematic configuration diagram showing a third embodiment of the exposure device. 
         FIG. 11  is a schematic configuration diagram showing a fourth embodiment of the exposure device. 
         FIG. 12  is a schematic configuration diagram showing a fifth embodiment of the exposure device. 
         FIG. 13  is a schematic configuration diagram showing a sixth embodiment of the exposure device. 
         FIG. 14  is a schematic configuration diagram showing a seventh embodiment of the exposure device. 
         FIG. 15  is a schematic configuration diagram showing an eighth embodiment of the exposure device. 
         FIG. 16  is a diagram showing a state in which the substrate is irradiated with the parallel light in the method for manufacturing a light-diffusing member of the present embodiment. 
         FIG. 17  is a diagram showing a state in which the substrate is irradiated with the parallel light in the method for manufacturing a light-diffusing member of the present embodiment. 
         FIG. 18  is a diagram showing a state in which the substrate is irradiated with the parallel light in the method for manufacturing a light-diffusing member of the present embodiment. 
         FIG. 19  is a schematic configuration diagram showing a ninth embodiment of the exposure device. 
         FIG. 20  is a schematic configuration diagram showing a tenth embodiment of the exposure device. 
         FIG. 21  is a schematic configuration diagram showing an eleventh embodiment of the exposure device. 
         FIG. 22  is a schematic sectional view showing an embodiment of the light-diffusing member. 
         FIG. 23  is a schematic configuration diagram showing a twelfth embodiment of the exposure device. 
         FIG. 24  is a schematic sectional view showing an embodiment of the light-diffusing member. 
         FIG. 25  is a schematic configuration diagram showing a thirteenth embodiment of the exposure device. 
         FIG. 26  is a schematic sectional view showing an embodiment of the light-diffusing member. 
         FIG. 27  is a schematic configuration diagram showing a fourteenth embodiment of the exposure device. 
         FIG. 28  is a diagram showing a state in which the parallel light is incident on the substrate through a prism. 
         FIG. 29  is a diagram showing the refraction of parallel light incident on the prism. 
         FIG. 30  is a graph showing the relationship between an inclined angle of the prism and an inclined angle of light emitted from the bottom surface of the prism. 
         FIG. 31  is a graph showing the relationship between the inclined angle of light emitted from the bottom surface of the prism and a taper angle of the light-diffusing section. 
         FIG. 32  is a schematic configuration diagram showing a case where a plurality of prisms is used in the fourteenth embodiment of the exposure device. 
         FIG. 33  is a schematic configuration diagram showing a fifteenth embodiment of the exposure device. 
         FIG. 34  is a schematic configuration diagram showing the fifteenth embodiment of the exposure device. 
         FIG. 35  is a schematic configuration diagram showing the fifteenth embodiment of the exposure device. 
         FIG. 36  is a schematic configuration diagram showing a sixteenth embodiment of the exposure device. 
         FIG. 37  is a schematic configuration diagram showing a seventeenth embodiment of the exposure device. 
         FIG. 38  is a schematic configuration diagram showing an eighteenth embodiment of the exposure device. 
         FIG. 39  is a schematic configuration diagram showing a nineteenth embodiment of the exposure device. 
         FIG. 40  is a schematic configuration diagram showing a twentieth embodiment of the exposure device. 
         FIG. 41  is a schematic configuration diagram showing the twentieth embodiment of the exposure device. 
         FIG. 42  is a schematic configuration diagram showing the twentieth embodiment of the exposure device. 
         FIG. 43  is a schematic configuration diagram showing a twenty-first embodiment of the exposure device. 
         FIG. 44  is a schematic configuration diagram showing the twenty-first embodiment of the exposure device. 
         FIG. 45  is a longitudinal sectional view showing an embodiment of a liquid crystal display device. 
         FIG. 46  is a longitudinal sectional view of a liquid crystal panel. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Embodiments of a light-diffusing member, a method for manufacturing the same, and a display device of the present embodiment will be described. 
     The present embodiment is specifically described to allow those skilled in the art to more easily understand the gist of the invention, and is not limited to the present invention unless specified otherwise. 
     Light-Diffusing Member and Method for Manufacturing the Same 
     (1) First Embodiment 
     A first embodiment of a method for manufacturing a light-diffusing member and a light-diffusing member manufactured by the method for manufacturing the light-diffusing member will be described with reference to  FIGS. 1 to 8 . 
       FIG. 1  is a schematic configuration diagram showing an example of a device for manufacturing the light-diffusing member used in the method for manufacturing the light-diffusing member of the present embodiment. 
     A manufacturing apparatus  1  shown in  FIG. 1  transfers an elongated substrate  30  in a roll-to-roll manner and performs various processes during the transfer. In the manufacturing apparatus  1 , a printing method is used to form a light shielding layer  31 . 
     As shown in  FIG. 1 , a supply roller  11  that supplies the substrate  30  is provided at one end of the manufacturing apparatus  1 , and a winding roller  12  that winds the substrate  30  is provided at the other end thereof. 
     The substrate  30  moves toward the winding roller  12  from the supply roller  11 . A printing device  13 , a negative photosensitive resin layer forming device  16  which includes a barcode device  14  and a first drying device  15 , a development device  17 , and a second drying device  18  are sequentially arranged higher than the substrate  30  from the supply roller  11  toward the winding roller  12 . 
     An exposure device  19  is arranged below the substrate  30 . 
     The printing device  13  is configured to print the light shielding layer  31  made of a black resin on the substrate  30 . 
     In a case where a light-diffusing section is formed using a negative photosensitive resin  32  having optical transparency, the barcode device  14  is configured to coat the light shielding layer  31  with the negative photosensitive resin  32  having optical transparency. 
     In the case where the light-diffusing section is formed using the negative photosensitive resin  32  having optical transparency, the first drying device  15  dries the coated negative photosensitive resin  32 , and uses the dried resin as a coating film  33 . 
     Although it has been described in the present embodiment that the negative photosensitive resin layer forming device  16  includes the barcode device  14  and the first drying device  15 , the present embodiment is not limited thereto. In the present embodiment, in a case where the light-diffusing section is formed using a dry film resist, a laminating device which laminates the dry film resist on the substrate  30  is used as the negative photosensitive resin layer forming device  16 . 
     The development device  17  is configured to develop the exposed negative photosensitive resin  32  (coating film  33 ) by using a developing solution. 
     The second drying device  18  is configured to dry the substrate  30  on which a light-diffusing section  34  made of the developed negative photosensitive resin  32  (the coating film  33 ) is formed. 
     The exposure device  19  is configured to expose the coating film  33  of the negative photosensitive resin  32  from a side close to the substrate  30 . As shown in  FIG. 1 , the exposure device  19  includes light sources  20 . 
     In the present embodiment, the light shielding layer  31  is initially formed on one surface  30   a  of the substrate  30  being transferred by the printing method using the printing device  13  (light shielding layer forming process). 
     The substrate  30  is generally formed using resins such as thermoplastic polymer, thermosetting resin and photo-polymeric resin. A substrate made of an appropriate transparent resin (optical transparency) such as acrylic polymer, olefin polymer, vinyl polymer, cellulose polymer, amide polymer, fluorine polymer, urethane polymer, silicone polymer, or imide polymer may be used. 
     As the substrate  30 , for example, a substrate made of a transparent resin such as a triacetylcellulose (TAC) film, a polyethylene-telephthalate (PET) film, a cycloolefin polymer (COP) film, a polycarbonate (PC) film, a polyethyleneaphthalate (PEN) film, a polyether sulphone (PES) film, or a polyimide (PI) film is preferably used. 
     The substrate  30  serves as a base in a case where the materials of the light shielding layer  31  or the light-diffusing section  34  are coated, and needs to have heat resistance and mechanical strength in a heat treatment process during the manufacturing process. Accordingly, as the substrate  30 , a substrate such as glass may be used in addition to the substrate made of resin. 
     Preferably, the substrate  30  has a thin thickness to the extent that heat resistance or mechanical strength is not impaired. This is because there is a concern that display may be blurred as the thickness of the substrate  30  becomes thicker. Preferably, the total light transmittance of the substrate  30  is 90% or more according to JIS K 7361-1. If the total light transmittance is 90% or more, sufficient transparency is obtained. 
     As shown in  FIG. 1 , the light shielding layer  31  is randomly formed on the one surface  30   a  of the substrate  30 . 
     For example, the light shielding layer  31  is made of an organic material such as black resist having light absorptivity and photosensitivity. In addition, the light shielding layer  31  may be formed using black-based ink obtained by mixing metallic film such as a multilayer film made of Cr (chrome) or Cr/chromium oxide, pigments or dyes to be used in the black ink, and a multicolored ink. In addition to these materials, any material having light shielding properties may be used as the material of the light shielding layer  31 . 
     For example, the thickness of the light shielding layer  31  is set to be smaller than a height from a light incident end surface up to a light emission end surface of the light-diffusing section  34 . 
     Subsequently, the barcode device  14  coats the one surface  30   a  of the substrate  30  with the negative photosensitive resin  32  such that the light shielding layer  31  is covered, and the first drying device  15  dries the coated negative photosensitive resin  32  to form the coating film (hereinafter, referred to as a “negative photosensitive resin layer”)  33  (a negative photosensitive resin layer forming process). 
     For example, the negative photosensitive resin  32  is made of an organic material such as acrylic resin or epoxy resin having optical transparency and photosensitivity. In the present embodiment, preferably, the negative photosensitive resin  32  has the same refractive index as that of the substrate  30 . 
     Thereafter, the exposure device  19  exposes the negative photosensitive resin layer  33  by irradiating the negative photosensitive resin layer  33  with parallel light F such as ultraviolet light diagonally with respect to a normal direction of the one surface  30   a  of the substrate  30  in two directions so as to allow the light to pass through the substrate  30  of a region other than a region where the shielding layer  31  is formed from a surface opposite to the one surface  30   a  of the substrate  30  on which the shielding layer  31  and the negative photosensitive resin layer  33  have been formed (a negative photosensitive resin layer exposing process). 
     Here, the process of exposing the negative photosensitive resin layer  33  in the present embodiment will be described. 
     In the present embodiment, for example, the device having the configuration shown in  FIG. 2  is used as the exposure device  19 . 
     In  FIG. 2 , the light shielding layer  31  and the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  are omitted. 
     In  FIG. 2 , a direction (direction shown by an arrow of  FIG. 2 ) in which the substrate  30  is transferred is referred to as an X-axis direction, a width direction of the substrate  30  is referred to as a Y-axis direction, and a height direction of the exposure device  19  is referred to as a Z-axis direction. 
     The exposure device  19  schematically includes the light sources  20  for irradiating the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  with the parallel light F such as the ultraviolet light, and a first roller  41 , a second roller  42 , a third roller  43 , a fourth roller  44 , and a fifth roller  45  which are arranged so as to correspond to a region (exposure region) α 1  where the negative photosensitive resin layer  33  can be exposed by the light sources  20  and sequentially support the substrate  30  in the transfer direction thereof. 
     The light sources  20  face the substrate  30 , and are arranged so as to irradiate the substrate with the parallel light F perpendicular to the transfer direction (X-axis direction) of the substrate  30 . 
     For example, an ultraviolet lamp is used as the light source  20 . 
     Here, the parallel light F is light emitted with a full width at a half maximum of ±2 degrees or less and high intensity at which azimuth is 0 degrees, and is, for example, light having distribution characteristics as shown in  FIG. 3 . 
     The first roller  41  is arranged on the one surface  30   a  of the substrate  30  on a supply side of the substrate  30 , and supports the substrate  30 . 
     The second roller  42  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the first roller  41 , is arranged on the surface (the other surface of the substrate  30 )  30   b  opposite to the one surface  30   a  of the substrate  30 , and supports the substrate  30 . The second roller  42  is arranged near one end (end on the supply side of the substrate  30 ) of the exposure region α 1 . 
     The third roller  43  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the second roller  42  and the fourth roller  44 , is arranged on the one surface  30   a  of the substrate  30  in the center of the exposure region α 1 , and supports the substrate  30 . The third roller  43  moves in the Z-axis direction, and is arranged higher than the first roller  41 , the second roller  42 , the fourth roller  44  and the fifth roller  45  in the Z-axis direction. 
     The fourth roller  44  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the third roller  43 , is arranged on the other surface  30   b  of the substrate  30 , and supports the substrate  30 . The fourth roller  44  is arranged near the other end (end on a winding side of the substrate  30 ) of the exposure region α 1 . 
     The fifth roller  45  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the fourth roller  44 , is arranged on the one surface  30   a  of the substrate  30 , and supports the substrate  30 , on the winding side of the substrate  30 . 
     In the process of exposing the negative photosensitive resin layer  33 , the position of the third roller  43  moves upward in the Z-axis direction (higher than the first roller  41 , the second roller  42 , the fourth roller  44  and the fifth roller  45  in the Z-axis direction), and thus, it is possible to allow the substrate  30  being transferred in the X-axis direction to have an arbitrary inclined angle θ R  with respect to the X-axis direction, as shown in  FIG. 4 . In  FIG. 4 , a normal line of the substrate  30  is expressed by symbol β. 
     In such a state, the parallel light F emitted from the light source  20  is incident at an inclined angle ±θ R  inclined with respect to the normal direction of the substrate  30 . For example, in a case where an inclined angle (incident angle) of the second roller  42  is +θ R  with the third roller  43  as its center, it is assumed that an inclined angle (incident angle) of the fourth roller  44  is −θ R . By arranging the third roller  43  that moves in the Z-axis direction within the exposure region α 1  in the center of the exposure region α 1 , the amount of irradiated parallel light F at the inclined angle +θ R  of the second roller  42  and the amount of irradiated parallel light at the inclined angle −θ R  of the fourth roller  44  can be equal to each other. 
     As mentioned above, since the parallel light F is applied from the other surface  30   b  (the surface opposite to the surface of the substrate  30  on which the light shielding layer  31  and the negative photosensitive resin layer  33  are formed) in a state in which the substrate  30  is inclined in the X-axis direction, that is, in a state in which the substrate has the inclined angle with respect to the normal direction, the region of the substrate  30  other than the normal direction can be irradiated with the high-intensity parallel light. 
     More specifically, the parallel light F applied to the substrate  30  from the light source  20  is incident diagonally with respect to the normal direction of the substrate  30 , as shown in  FIG. 5 . The parallel light F is refracted in a case where the parallel light is incident on the substrate  30  from the air, and transmits through the negative photosensitive resin layer  33  at a refracted angle at the time of being incident on the substrate  30 . Thereafter, the parallel light F is emitted while being refracted from the negative photosensitive resin layer  33  to the air.  FIG. 5( a )  is a diagram showing a traveling state of the parallel light F on the second roller  42  side, and  FIG. 5( b )  is a diagram showing a traveling state of the parallel light F on the fourth roller  44  side. 
     As stated above, by moving the position of the third roller  43  in the Z-axis direction and allowing the substrate  30  to have an arbitrary inclined angle with respect to the normal direction thereof, since the parallel light F emitted from the light source  20  can be incident so as to be inclined with respect to the normal direction of the substrate  30 , a taper angle of the negative photosensitive resin layer  33  (light-diffusing section  34 ) can be adjusted by the inclined angle (the inclined angle with respect to the X-axis direction) of the substrate  30 . As shown in  FIG. 6 , the taper angle of the light-diffusing section  34  and the inclined angle of the substrate  30  are substantially inverse in proportion to each other. 
     For example, it is assumed that a refractive index with which ultraviolet light (wavelength: 365 nm) is refracted from the substrate  30  and the negative photosensitive resin layer  33  is n=1.5. For example, in a case where the taper angle of the light-diffusing section  34  of the light-diffusing member needs to be 80 degrees, the negative photosensitive resin layer  33  may be exposed by setting the inclined angle (the inclined angle θ R ) with respect to the X-axis direction of the substrate  30  to be 15 degrees and irradiating the substrate  30  and the negative photosensitive resin layer  33  with the parallel light F. Preferably, the taper angle of the light-diffusing section  34  is 60 degrees or more and less than 90 degrees. For example, as shown in  FIG. 6 , by setting the inclined angle with respect to the X-axis direction of the substrate  30 , that is, the inclined angle of the parallel light F with respect to the normal direction of the substrate  30  to be 50 degrees, it is possible to set the taper angle of the light-diffusing section  34  to be 60 degrees. In the present embodiment, in order to set the taper angle of the light-diffusing section  34  to be 60 degrees or more and less than 90 degrees, the incident angle of the parallel light F with respect to the normal direction of the substrate  30  may be changed within a range of ±50 degrees. 
     For example, since the parallel light F (F 1 ) is incident with respect to the normal direction of the substrate  30  at the incident angle +θ R  on the second roller  42  side as shown in  FIG. 5( a ) , the parallel light F 1  travels in the negative photosensitive resin layer  33  while being inclined toward the supply side of the substrate  30  as shown in  FIG. 7 . Meanwhile, for example, since the parallel light F (F 2 ) is incident with respect to the normal direction of the substrate  30  at the inclined angle −θ R  on the fourth roller  44  side as shown in  FIG. 5( b ) , the parallel light F 2  travels in the negative photosensitive resin layer  33  while being inclined toward the winding side of the substrate  30  as shown in  FIG. 7 . 
     As described above, according to the present embodiment, it is possible to expose the negative photosensitive resin layer  33  in two different directions by using the parallel light F, as shown in  FIG. 7 . The negative photosensitive resin layer  33  is exposed on the section (section of the substrate  30  in the normal direction) shown in  FIG. 7  so as to be bilaterally symmetrical. 
     Subsequently, the development device  17  develops the exposed negative photosensitive resin layer  33 , and the second drying device  18  forms the light-diffusing section  34  having a light emission end surface  34   a  on a side close to the substrate  30  and a light incident end surface  34   b  having an area greater than an area of the light emission end surface  34   a  on a side opposite to the substrate  30  on the one surface  30   a  of the substrate  30  as shown in  FIG. 8  (a light-diffusing section forming process). 
     Thereafter, a light-diffusing member  35  is obtained by drying the substrate  30  formed on the light-diffusing section  34 . 
     As shown in  FIG. 8 , the light-diffusing section  34  is formed such that the area of the light emission end surface  34   a  is small and a sectional area in a horizontal direction escalates as the cross section area becomes further away from the substrate  30  when viewed as a whole. 
     That is, the light-diffusing section  34  has a quadrangular pyramid shape of a so-called reverse taper shape when viewed from the substrate  30 . The light emission end surface  34   a  and the light incident end surface  34   b  of the light-diffusing section  34  are formed in parallel with each other. Angles (taper angles) of taper-shaped side surfaces  34   c  of the light-diffusing section  34  are bilaterally symmetrical on the section (section of the substrate  30  in the normal direction) shown in  FIG. 8 . 
     Such a light-diffusing section  34  is a section of the light-diffusing member  35  which contributes to light transmission. That is, the light incident on the light-diffusing section  34  from the light incident end surface  34   b  is totally reflected from the taper-shaped side surfaces  34   c  of the light-diffusing section  34 , and is guided while being substantially confined within the light-diffusing section  34 , and is emitted from the light emission end surface  34   a.    
     (2) Second Embodiment 
     A second embodiment of the method for manufacturing the light-diffusing member will be described with reference to  FIG. 9 . 
     The method for manufacturing the light-diffusing member of the present embodiment is different from the method for manufacturing the light-diffusing member of the above-described first embodiment in that an exposure device  50  shown in  FIG. 9  is used as the exposure device in the process of exposing the negative photosensitive resin layer  33 . Other processes are the same as those in the method for manufacturing the light-diffusing member of the above-described first embodiment. 
     In  FIG. 9 , the same components as those shown in  FIG. 2  will be assigned the same reference numerals, and the description thereof will be omitted. In  FIG. 9 , the light shielding layer  31  and the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  will be omitted. 
     In  FIG. 9 , a direction (direction shown by an arrow in  FIG. 9 ) in which the substrate  30  is transferred is referred to as an X-axis direction, a width direction of the substrate  30  is referred to as a Y-axis direction, and a height direction of the exposure device  50  is referred to as a Z-axis direction. 
     The exposure device  50  schematically includes two light sources  51  and  52  for irradiating the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  with the parallel light F such as ultraviolet light, and a first roller  53 , a second roller  54 , a third roller  55 , a fourth roller  56  and a fifth roller  57  which are arranged so as to correspond to two regions (exposure regions) α 11  and α 12  where the negative photosensitive resin layer  33  can be exposed by the light sources  51  and  52  and sequentially support the substrate  30  in the transfer direction. 
     The light sources  51  and  52  face the substrate  30 , and are arranged in positions which are positioned in the transfer direction (X-axis direction) of the substrate  30  and are symmetrical with respect to the third roller  55 . The light sources  51  and  52  are arranged so as to irradiate the substrate  30  with the parallel light F in a direction perpendicular to the transfer direction (X-axis direction) thereof. 
     For example, ultraviolet lamps are used as the light sources  51  and  52 . 
     The first roller  53  is arranged on the one surface  30   a  of the substrate  30  and supports the substrate  30  on the supply side of the substrate  30 . 
     The second roller  54  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the first roller  53  and the third roller  55 , is arranged on the other surface  30   b  of the substrate  30 , and supports the substrate  30 . 
     The second roller  54  is arranged near one end (end on the supply side of the substrate  30 ) of the exposure region α 11  on the supply side of the substrate  30 . 
     The third roller  55  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the second roller  54  and the fourth roller  56 , is arranged on the one surface  30   a  of the substrate  30 , and supports the substrate  30 . The third roller  55  is arranged near the other end (end on the winding side of the substrate  30 ) of the exposure region α 11  on the supply side of the substrate  30  and near one end (end on the supply side of the substrate  30 ) of the exposure region α 12  on the winding side of the substrate  30 . The third roller  55  is arranged in an intermediate portion between the second roller  54  and the fourth roller  56 . The third roller  55  moves in the Z-axis direction, and is arranged higher than the first roller  53 , the second roller  54 , the fourth roller  56  and the fifth roller  57  in the Z-axis direction. 
     The fourth roller  56  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the third roller  55  and the fifth roller  57 , is arranged on the other surface  30   b  of the substrate  30 , and supports the substrate  30 . The fourth roller  56  is arranged near the other end (end on the winding side of the substrate  30 ) of the exposure region α 12  on the winding side of the substrate  30 . 
     The fifth roller  57  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the fourth roller  56 , and is arranged on the one surface  30   a  of the substrate  30  and supports the substrate  30  on the winding side of the substrate  30 . 
     That is, the exposure region α 11  on the supply side of the substrate  30  is formed between the second roller  54  and the third roller  55 , and the exposure region α 12  on the winding side of the substrate  30  is formed between the third roller  55  and the fourth roller  56 . 
     In the process of exposing the negative photosensitive resin layer  33 , the position of the third roller  55  moves upward in the Z-axis direction (higher than the first roller  53 , the second roller  54 , the fourth roller  56  and the fifth roller  57  in the Z-axis direction), and thus, it is possible to allow the substrate  30  to have an arbitrary inclined angle with respect to the X-axis direction, similarly to the method for manufacturing the light-diffusing member of the above-described first embodiment. Accordingly, it is possible to apply the parallel light F from the other surface  30   b  in a state in which the normal direction of the substrate  30  has the inclined angle with respect to the normal direction. 
     According to the present embodiment, since the exposure region α 11  on the supply side of the substrate  30  is formed between the second roller  54  and the third roller  55  and the exposure region α 12  on the winding side of the substrate  30  is formed between the third roller  55  and the fourth roller  56  by arranging two light sources  51  and  52  in the positions symmetrical with respect to the third roller  55 , the parallel light F having a prescribed intensity can be incident on the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  without shielding the parallel light emitted from the light sources  51  and  52  by the first roller  53 , the second roller  54 , the third roller  55 , the fourth roller  56  and the fifth roller  57  provided in the exposure device  50 . Thus, it is possible to form the light-diffusing section  34  having a prescribed taper angle. According to the present embodiment, it is possible to expose the negative photosensitive resin layer  33  by using the parallel light F in two different directions. 
     According to the present embodiment, the light-diffusing member  35  on which the same light-diffusing section  34  as that of the above-described first embodiment is formed is obtained. 
     (3) Third Embodiment 
     A third embodiment of the method for manufacturing the light-diffusing member will be described with reference to  FIG. 10 . 
     The method for manufacturing the light-diffusing member of the present embodiment is different from the method for manufacturing the light-diffusing member of the above-described first embodiment in that an exposure device  60  shown in  FIG. 10  is used as the exposure device in the process of exposing the negative photosensitive resin layer  33 . Other processes are the same as those in the method for manufacturing the light-diffusing member of the above-described first embodiment. 
     In  FIG. 10 , the same components as those shown in  FIG. 2  will be assigned the same reference numerals, and the description thereof will be omitted. In  FIG. 10 , the light shielding layer  31  and the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  will be omitted. 
     In  FIG. 10 , a direction (direction shown by an arrow in  FIG. 10 ) in which the substrate  30  is transferred is referred to as an X-axis direction, a width direction of the substrate  30  is referred to as a Y-axis direction, and a height direction of the exposure device  50  is referred to as a Z-axis direction. 
     The exposure device  60  schematically includes four light sources  61 ,  62 ,  63  and  64  for irradiating the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  with the parallel light F such as the ultraviolet light, and a first roller  65 , a second roller  66 , a third roller  67 , a fourth roller  68 , a fifth roller  69 , a sixth roller  70  and a seventh roller  71  which correspond to four regions (exposure regions) α 21 , α 22 , α 23  and α 24  (hereinafter, respectively referred to as “a first exposure region α 21 , a second exposure region α 22 , a third exposure region α 23 , and a fourth exposure region α 24 ”) where the negative photosensitive resin layer  33  can be exposed by the light sources  61 ,  62 ,  63  and  64  and sequentially support the substrate  30  in the transfer direction thereof. 
     A group of light sources  61  and  62  and a group of light sources  63  and  64  face the substrate  30 , and are arranged in positions which are positioned in the transfer direction (X-axis direction) of the substrate  30  and are symmetrical with respect to the fourth roller  68 . The light sources  61 ,  62 ,  63  and  64  are arranged so as to irradiate the substrate  30  with the parallel light F in a direction perpendicular to the transfer direction (X-axis direction) of the substrate. 
     For example, ultraviolet lamps are sued as the light sources  61 ,  62 ,  63  and  64 . 
     The first roller  65  is arranged on the one surface  30   a  of the substrate  30  and supports the substrate  30  on the supply side of the substrate  30 . 
     The second roller  66  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the first roller  65  and the third roller  67 , is arranged on the other surface  30   b  of the substrate  30 , and supports the substrate  30 . The second roller  66  is arranged near one end (end on the supply side of the substrate  30 ) of the first exposure region α 21 . 
     The third roller  67  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the second roller  66  and the fourth roller  68 , is arranged on the one surface  30   a  of the substrate  30 , and supports the substrate  30 . The third roller  67  is arranged near the other end (end on the winding side of the substrate  30 ) of the first exposure region α 21  and near one end (end on the supply side of the substrate  30 ) of the second exposure region α 22 . 
     The fourth roller  68  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the third roller  67  and the fifth roller  69 , is arranged on the one surface  30   a  of the substrate  30 , and supports the substrate  30 . The fourth roller  68  is arranged near the other end (end on the winding side of the substrate  30 ) of the second exposure region α 22  and near one end (end on the supply side of the substrate  30 ) of the third exposure region α 23 . The fourth roller  68  is arranged in an intermediate portion between the third roller  67  and the fifth roller  69 . The fourth roller  68  moves in the Z-axis direction, and is arranged higher than the first roller  65 , the second roller  66 , the third roller  67 , the fifth roller  69 , the sixth roller  70  and the seventh roller  71  in the Z-axis direction. 
     The fifth roller  69  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the fourth roller  68  and the sixth roller  70 , is arranged on the one surface  30   a  of the substrate  30 , and supports the substrate  30 . The fifth roller  69  is arranged near the other end (end on the winding side of the substrate  30 ) of the third exposure region α 23  and near one end (end on the supply side of the substrate  30 ) of the fourth exposure region α 24 . 
     The sixth roller  70  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the fifth roller  69  and the seventh roller  71 , is arranged on the other surface  30   b  of the substrate  30 , and supports the substrate  30 . The sixth roller  70  is arranged near the other end (end on the winding side of the substrate  30 ) of the fourth exposure region α 24 . 
     The seventh roller  71  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the sixth roller  70 , and is arranged on one surface  30   a  of the substrate  30  and supports the substrate  30  on the winding side of the substrate  30 . 
     That is, the first exposure region α 21  is formed between the second roller  66  and the third roller  67 , the second exposure region α 22  is formed between the third roller  67  and the fourth roller  68 , the third exposure region α 23  is formed between the fourth roller  68  and the fifth roller  69 , and the fourth exposure region α 24  is formed between the fifth roller  69  and the sixth roller  70 . 
     In the process of exposing the negative photosensitive resin layer  33 , the position of the fourth roller  68  moves upwards (higher than the first roller  65 , the second roller  66 , the third roller  67 , the fifth roller  69 , the sixth roller  70  and the seventh roller  71  in the Z-axis direction) in the Z-axis direction, and thus, the substrate  30  can have an arbitrary inclined angle with respect to the X-axis direction, similarly to the method for manufacturing the light-diffusing member of the above-described first embodiment. Accordingly, the parallel light F can be applied from the other surface  30   b  in a state in which the substrate  30  has the inclined angle with respect to the normal direction. 
     According to the present embodiment, since the first exposure region α 21  is formed between the second roller  66  and the third roller  67 , the second exposure region α 22  is formed between the third roller  67  and the fourth roller  68 , the third exposure region α 23  is formed between the fourth roller  68  and the fifth roller  69 , and the fourth exposure region α 24  is formed between the fifth roller  69  and the sixth roller  70  by arranging the group of two light sources  61  and  62  and the group of two light sources  63  and  64  in the positions symmetrical with respect to the fourth roller  68 , the parallel light F having a prescribed intensity can be incident on the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  without shielding the parallel light emitted from light sources  61 ,  62 ,  63  and  64  by the first roller  65 , the second roller  66 , the third roller  67 , the fourth roller  68 , the fifth roller  69 , the sixth roller  70  and the seventh roller  71  provided in the exposure device  60 . Accordingly, it is possible to form the light-diffusing section  34  having a prescribed taper angle. According to the present embodiment, it is possible to expose the negative photosensitive resin layer  33  by using the parallel light F in two different directions. 
     According to the present embodiment, the light-diffusing member  35  on which the same light-diffusing section  34  as that of the above-described first embodiment is formed is obtained. 
     (4) Fourth Embodiment 
     A fourth embodiment of the method for manufacturing the light-diffusing member will be described with reference to  FIG. 11 . 
     The method for manufacturing the light-diffusing member of the present embodiment is different from the method for manufacturing the light-diffusing member of the above-described first embodiment in that an exposure device  80  shown in  FIG. 11  is used as the exposure device in the process of exposing the negative photosensitive resin layer  33 . Other processes are the same as those in the method for manufacturing the light-diffusing member of the above-described first embodiment. 
     In  FIG. 11 , the same components as those shown in  FIG. 2  will be assigned the same reference numerals, and the description thereof will be omitted. In  FIG. 11 , the light shielding layer  31  and the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  will be omitted. 
     In  FIG. 11 , a direction (direction shown by an arrow in  FIG. 11 ) in which the substrate  30  is transferred is referred to as an X-axis direction, a width direction of the substrate  30  is referred to as a Y-axis direction, and a height direction of the exposure device  80  is referred to as a Z-axis direction. 
     The exposure device  80  schematically includes a light source  81  for irradiating the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  with the parallel light F such as the ultraviolet light, and a first roller  82 , a second roller  83 , a third roller  84 , a fourth roller  85  and a fifth roller  86  which are arranged so as to correspond to a region (exposure region) α 31  where the negative photosensitive resin layer  33  can be exposed by the light source  81  and sequentially support the substrate  30  in the transfer direction thereof, and a light shielding section  87  arranged between the light source  81  and the third roller  84 . 
     The light source  81  is arranged so as to irradiate the substrate  30  with the parallel light in a direction perpendicular to the transfer direction (X-axis direction) of the substrate  30 . 
     For example, an ultraviolet lamp is used as the light source  81 . 
     The first roller  82  is arranged on the one surface  30   a  of the substrate  30  and supports the substrate  30  on the supply side of the substrate  30 . 
     The second roller  83  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the first roller  82  and the third roller  84 , is arranged on the other surface  30   b  of the substrate  30 , and supports the substrate  30 . The second roller  83  is arranged near one end (end on the supply side of the substrate  30 ) of the exposure region α 31  of the substrate  30 . 
     The third roller  84  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the second roller  83  and the fourth roller  85 , is arranged on the one surface  30   a  of the substrate  30 , and supports the substrate  30 . The third roller  84  is arranged in an intermediate portion between the second roller  83  and the fourth roller  85 . The third roller  84  moves in the Z-axis direction, and is arranged higher than the first roller  82 , the second roller  83 , the fourth roller  85 , and the fifth roller  86  in the Z-axis direction. 
     The fourth roller  85  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the third roller  84  and the fifth roller  86 , is arranged on the other surface  30   b  of the substrate  30 , and supports the substrate  30 . The fourth roller  85  is arranged near the other end (end on the winding side of the substrate  30 ) of the exposure region α 31  of the substrate  30 . 
     The fifth roller  86  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the fourth roller  85 , and is arranged on the one surface  30   a  of the substrate  30  and supports the substrate  30  on the winding side of the substrate  30 . 
     The light shielding section  87  is arranged between the light source  81  and the third roller  84  in parallel with the transfer direction (X-axis direction) of the substrate  30 . The parallel light F emitted from the light source  81  is shielded by the light shielding section  87 , and a region below the light shielding section  87  in the Z-axis direction is not irradiated with the parallel light F. That is, the third roller  84  and the substrate  30  present near the third roller is not irradiated with the parallel light F emitted from the light source  81  by the light shielding section  87 . 
     In the process of exposing the negative photosensitive resin layer  33 , the position of the third roller  84  moves upward in the Z-axis direction (higher than the first roller  82 , the second roller  83 , the fourth roller  85  and the fifth roller  86  in the Z-axis direction), and thus, the substrate  30  can have an arbitrary inclined angle with respect to the X-axis direction, similarly to the method for manufacturing the light-diffusing member of the above-described first embodiment. Accordingly, it is possible to apply the parallel light F from the other surface  30   b  in a state in which the normal direction of the substrate  30  has the inclined angle with respect to the normal direction. 
     According to the present embodiment, since the light shielding section  87  is arranged between the light source  81  and the third roller  84  in parallel with the transfer direction (X-axis direction) of the substrate  30 , the parallel light F emitted from the light source  81  is shielded by the light shielding section  87 , and the region below the light shielding section  87  in the Z-axis direction is not irradiated with the parallel light F. Accordingly, the parallel light F emitted from the light source  81  is shielded by the third roller  84 , and thus, it is possible to prevent a problem that the parallel light having a prescribed intensity is not incident on the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30 . Therefore, it is possible to form the light-diffusing section  34  having a prescribed taper angle. According to the present embodiment, it is possible to expose the negative photosensitive resin layer  33  by the parallel light F in two different directions. 
     According to the present embodiment, the light-diffusing member  35  on which the same light-diffusing section  34  as that of the above-described first embodiment is formed is obtained. 
     (5) Fifth Embodiment 
     A fifth embodiment of the method for manufacturing the light-diffusing member will be described with reference to  FIG. 12 . 
     The method for manufacturing the light-diffusing member of the present embodiment is different from the method for manufacturing the light-diffusing member of the above-described first embodiment in that an exposure device  90  shown in  FIG. 12  is used as the exposure device in the process of exposing the negative photosensitive resin layer  33 . Other processes are the same as those in the method for manufacturing the light-diffusing member of the above-described first embodiment. 
     In  FIG. 12 , the same components as those shown in  FIG. 2  will be assigned the same reference numerals, and the description thereof will be omitted. In  FIG. 12 , the light shielding layer  31  and the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  will be omitted. 
     In  FIG. 12 , a direction (direction shown by an arrow in  FIG. 12 ) in which the substrate  30  is transferred is referred to as an X-axis direction, a width direction of the substrate  30  is referred to as a Y-axis direction, and a height direction of the exposure device  90  is referred to as a Z-axis direction. 
     The exposure device  90  schematically includes a light source  91  for irradiating the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  with the parallel light F such as ultraviolet light, a first roller  92 , a second roller  93 , a third roller  94 , a fourth roller  95 , a fifth roller  96 , a sixth roller  97 , and a seventh roller  98  which are arranged so as to correspond to a region (exposure region) α 41  where the negative photosensitive resin layer  33  can be exposed by the light source  91  and sequentially support the substrate  30  in the transfer direction thereof, a first light shielding section  99  disposed between the light source  91  and the third roller  94 , a second light shielding section  100  disposed between the light source  91  and the fourth roller  95 , and a third light shielding section  101  disposed between the light source  91  and the fifth roller  96 . 
     The light source  91  faces the substrate  30 , and is arranged so as to irradiate the substrate  30  with the parallel light in a direction perpendicular to the transfer direction (X-axis direction) thereof. 
     For example, an ultraviolet lamp is used as the light source  91 . 
     The first roller  92  is arranged on the one surface  30   a  of the substrate  30  and supports the substrate  30  on the supply side of the substrate  30 . 
     The second roller  93  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the first roller  92  and the third roller  94 , is arranged on the other surface  30   b  of the substrate  30 , and supports the substrate  30 . The second roller  93  is arranged near one end (end on the supply side of the substrate  30 ) of the exposure region α 41  of the substrate  30 . 
     The third roller  94  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the second roller  93  and the fourth roller  95 , is arranged on the one surface  30   a  of the substrate  30 , and supports the substrate  30 . 
     The fourth roller  95  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the third roller  94  and the fifth roller  96 , is arranged on the one surface  30   a  of the substrate  30 , and supports the substrate  30 . The fourth roller  95  is arranged in an intermediate portion between the third roller  94  and the fifth roller  96 . The fourth roller  95  moves in the Z-axis direction, and is arranged higher than the first roller  92 , the second roller  93 , the third roller  94 , the fifth roller  96 , the sixth roller  97  and the seventh roller  98  in the Z-axis direction. 
     The fifth roller  96  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the fourth roller  95  and the sixth roller  97 , is arranged on the one surface  30   a  of the substrate  30 , and supports the substrate  30 . 
     The sixth roller  97  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the fifth roller  96  and the seventh roller  98 , is arranged on the other surface  30   b  of the substrate  30 , and supports the substrate  30 . The sixth roller  97  is arranged near the other end (end on the winding side of the substrate  30 ) of the exposure region α 41  of the substrate  30 . 
     The seventh roller  98  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the sixth roller  97 , and is arranged on the one surface  30   a  of the substrate  30  and supports the substrate  30  on the winding side of the substrate  30 . 
     The first light shielding section  99  is arranged between the light source  91  and the third roller  94  in parallel with the transfer direction (X-axis direction) of the substrate  30 . The parallel light F emitted from the light source  91  is shielded by the first light shielding section  99 , and a region below the first light shielding section  99  in the Z-axis direction is not irradiated with the parallel light F. That is, the third roller  94  and the substrate  30  near the third roller are not irradiated with the parallel light F emitted from the light source  91  by the first light shielding section  99 . 
     The second light shielding section  100  is arranged between the light source  91  and the fourth roller  95  in parallel with the transfer direction (X-axis direction) of the substrate  30 . The parallel light F emitted from the light source  91  is shielded by the second light shielding section  100 , and a region below the second light shielding section  100  in the Z-axis direction is not irradiated with the parallel light F. That is, the fourth roller  95  and the substrate  30  near the fourth roller are not irradiated with the parallel light F emitted from the light source  91  by the second light shielding section  100 . 
     The third light shielding section  101  is arranged between the light source  91  and the fifth roller  96  in parallel with the transfer direction (X-axis direction) of the substrate  30 . The parallel light F emitted from the light source  91  is shielded by the third light shielding section  101 , and a region below the third light shielding section  101  in the Z-axis direction is not irradiated with the parallel light F. That is, the fifth roller  96  and the substrate  30  near the fifth roller are not irradiated with the parallel light F emitted from the light source  91  by the third light shielding section  101 . 
     In the process of exposing the negative photosensitive resin layer  33 , the position of the fourth roller  95  moves upwards (higher than the first roller  92 , the second roller  93 , the third roller  94 , the fifth roller  96 , the sixth roller  97  and the seventh roller  98  in the Z-axis direction) in the Z-axis direction, and thus, the substrate  30  can have an arbitrary inclined angle with respect to the X-axis direction, similarly to the method for manufacturing the light-diffusing member of the above-described first embodiment. Accordingly, the parallel light F can be applied from the other surface  30   b  in a state in which the substrate  30  has the inclined angle with respect to the normal direction. 
     According to the present embodiment, since the first light shielding section  99  is arranged between the light source  91  and the third roller  94  in parallel with the transfer direction (X-axis direction) of the substrate  30 , the parallel light F emitted from the light source  91  is shielded by the first light shielding section  99 , and the region below the first light shielding section  99  in the Z-axis direction is not irradiated with the parallel light F. Accordingly, the parallel light F emitted from the light source  91  is shielded by the third roller  94 , and thus, it is possible to prevent a problem that the parallel light having a prescribed intensity is not incident on the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30 . Since the second light shielding section  100  is arranged between the light source  91  and the fourth roller  95  in parallel with the transfer direction (X-axis direction) of the substrate  30 , the parallel light F emitted from the light source  91  is shielded by the second light shielding section  100 , and the region below the second light-shielding section  100  in the Z-axis direction is not irradiated with the parallel light F. Accordingly, the parallel light F emitted from the light source  91  is shielded by the fourth roller  95 , and thus, it is possible to prevent a problem that the parallel light having a prescribed intensity is not incident on the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30 . Since the third light shielding section  101  is arranged between the light source  91  and the fifth roller  96  in parallel with the transfer direction (X-axis direction) of the substrate  30 , the parallel light F emitted from the light source  91  is shielded by the third light shielding section  101 , and the region below the third light-shielding section  101  in the Z-axis direction is not irradiated with the parallel light F. Accordingly, the parallel light F emitted from the light source  91  is shielded by the fifth roller  96 , and thus, it is possible to prevent a problem that the parallel light having a prescribed intensity is not incident on the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30 . Therefore, it is possible to form the light-diffusing section  34  having a prescribed taper angle. According to the present embodiment, it is possible to expose the negative photosensitive resin layer  33  by the parallel light F in two different directions. 
     According to the present embodiment, the light-diffusing member  35  on which the same light-diffusing section  34  as that of the above-described first embodiment is formed is obtained. 
     (6) Sixth Embodiment 
     A sixth embodiment of the method for manufacturing the light-diffusing member will be described with reference to  FIG. 13 . 
     The method for manufacturing the light-diffusing member of the present embodiment is different from the method for manufacturing the light-diffusing member of the above-described first embodiment in that an exposure device  110  shown in  FIG. 13  is used as the exposure device in the process of exposing the negative photosensitive resin layer  33 . Other processes are the same as those in the method for manufacturing the light-diffusing member of the above-described first embodiment. 
     In  FIG. 13 , the same components as those shown in  FIG. 2  will be assigned the same reference numerals, and the description thereof will be omitted. In  FIG. 13 , the light shielding layer  31  and the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  will be omitted. 
     In  FIG. 13 , a direction (direction shown by an arrow in  FIG. 13 ) in which the substrate  30  is transferred is referred to as an X-axis direction, a width direction of the substrate  30  is referred to as a Y-axis direction, and a height direction of the exposure device  110  is referred to as a Z-axis direction. 
     The exposure device  110  schematically includes two exposure devices  120  and  130  (hereinafter, referred to as “a first exposure device  120  and a second exposure device  130 ”) arranged in the transfer direction of the substrate  30  with a prescribed distance, and first rollers  111  and  111 , second rollers  112  and  112  and third rollers  113  and  113  which sequentially support the substrate  30  in the transfer direction. 
     For example, the same exposure device as that of any of the first embodiment to the fifth embodiment described above is used as the first exposure device  120  and the second exposure device  130 . The first exposure device  120  and the second exposure device  130  may be the same device, or may be different devices. That is, in the first exposure device  120  and the second exposure device  130 , the same exposure process may be performed, or different exposure processes may be performed. 
     The first rollers  111  and  111  are arranged on the one surface  30   a  and the other surface  30   b  of the substrate  30  and support (sandwich) the substrate  30  in the front stage of the first exposure device  120  on the supply side of the substrate  30 . 
     The second rollers  112  and  112  are arranged on the one surface  30   a  and the other surface  30   b  of the substrate  30  between the first exposure device  120  and the second exposure device  130 , and support (sandwich) the substrate  30 . 
     The third rollers  113  and  113  are arranged on the one surface  30   a  and the other surface  30   b  of the substrate  30  in the rear stage of the second exposure device  130  and support (sandwich) the substrate  30 , on the winding side of the substrate  30 . 
     According to the present embodiment, since the first exposure device  120  and the second exposure device  130  are arranged in the transfer direction of the substrate  30 , in each of the first exposure device  120  and the second exposure device  130 , the parallel light F having a prescribed intensity can be incident on the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30 . Therefore, it is possible to form the light-diffusing section  34  having a prescribed taper angle. According to the present embodiment, it is possible to expose the negative photosensitive resin layer  33  by the parallel light F in two or more different directions. 
     According to the present embodiment, the light-diffusing member  35  on which the same light-diffusing section  34  as that of the above-described first embodiment is formed is obtained. 
     (7) Seventh Embodiment 
     A seventh embodiment of the method for manufacturing the light-diffusing member will be described with reference to  FIG. 14 . 
     The method for manufacturing the light-diffusing member of the present embodiment is different from the method for manufacturing the light-diffusing member of the above-described first embodiment in that an exposure device  140  shown in  FIG. 14  is used as the exposure device in the process of exposing the negative photosensitive resin layer  33 . Other processes are the same as those in the method for manufacturing the light-diffusing member of the above-described first embodiment. 
     In  FIG. 14 , the same components as those shown in  FIG. 2  will be assigned the same reference numerals, and the description thereof will be omitted. In  FIG. 14 , the light shielding layer  31  and the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  will be omitted. 
     In  FIG. 14 , a direction (direction shown by an arrow in  FIG. 14 ) in which the substrate  30  is transferred is referred to as an X-axis direction, a width direction of the substrate  30  is referred to as a Y-axis direction, and a height direction of the exposure device  140  is referred to as a Z-axis direction. 
     The exposure device  140  schematically includes a first light source  141  and a second light source  142  for irradiating the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  with the parallel light such as ultraviolet light, and first rollers  143  and  143 , second rollers  144  and  144 , third rollers  145  and  145 , fourth rollers  146  and  146 , fifth rollers  147  and  147  and sixth rollers  148  and  148  which are arranged so as to correspond to two regions (exposure regions) α 51  and α 52  where the negative photosensitive resin layer  33  can be exposed by the first light source  141  and the second light source  142  and sequentially support the substrate  30  in the transfer direction. 
     The first light source  141  and the second light source  142  face the substrate  30 , and are arranged so as to irradiate the substrate  30  in the transfer direction (X-axis direction) thereof with the parallel light F in a direction perpendicular to the transfer direction (X-axis direction) of the substrate  30 . The first light source  141  is arranged between the second rollers  144  and  144  and the third rollers  145  and  145 . The second light source  142  is arranged between the fourth rollers  146  and  146  and the fifth rollers  147  and  147 . 
     For example, ultraviolet lamps are used as the first light source  141  and the second light source  142 . 
     The first rollers  143  and  143  are arranged on the one surface  30   a  and the other surface  30   b  of the substrate  30  and support (sandwich) the substrate  30  on the supply side of the substrate  30 . 
     The second rollers  144  and  144  are arranged in the transfer direction of the substrate  30  with a prescribed distance from the first rollers  143  and  143  and the third rollers  145  and  145 , are arranged on the one surface  30   a  and the other surface  30   b  of the substrate  30 , and support (sandwich) the substrate  30 . The second rollers  144  and  144  are arranged near one end (end on the supply side of the substrate  30 ) of the exposure region α 51  on the supply side of the substrate  30 . The second rollers  144  and  144  move at an arbitrary inclined angle with respect to the Y-axis direction while sandwiching the substrate  30  in line with the third rollers  145  and  145 . 
     The third rollers  145  and  145  are arranged in the transfer direction of the substrate  30  with a prescribed distance from the second rollers  144  and  144  and the fourth rollers  146  and  146 , are arranged on the one surface  30   a  and the other surface  30   b  of the substrate  30 , and support (sandwich) the substrate  30 . The third rollers  145  and  145  are arranged near the other end (end on the winding side of the substrate  30 ) of the exposure region α 51  on the supply side of the substrate  30 . The third rollers  145  and  145  moves at an arbitrary inclined angle with respect to the Y-axis direction while sandwiching the substrate  30  in line with the second rollers  144  and  144 . 
     The fourth rollers  146  and  146  are arranged in the transfer direction of the substrate  30  with a prescribed distance from the third rollers  145  and  145  and the fifth rollers  147  and  147 , are arranged on the one surface  30   a  and the other surface  30   b  of the substrate  30 , and support (sandwich) the substrate  30 . The fourth rollers  146  and  146  are arranged near one end (end on the supply side of the substrate  30 ) of the exposure region α 52  on the winding side of the substrate  30 . The fourth rollers  146  and  146  move at an arbitrary inclined angle with respect to the Y-axis direction while sandwiching the substrate  30  in line with the fifth rollers  147  and  147 . 
     The fifth rollers  147  and  147  are arranged in the transfer direction of the substrate  30  with a prescribed distance from the fourth rollers  146  and  146  and the sixth rollers  148   a  and  148 , are arranged on the one surface  30   a  and the other surface  30   b  of the substrate  30 , and support (sandwich) the substrate  30 . The fifth rollers  147  and  147  are arranged near the other end (end on the winding side of the substrate  30 ) of the exposure region α 52  on the winding side of the substrate  30 . The fifth rollers  147  and  147  move at an arbitrary inclined angle with respect to the Y-axis direction while sandwiching the substrate  30  in line with the fourth rollers  146  and  146 . 
     The sixth rollers  148  and  148  are arranged in the transfer direction of the substrate  30  with a prescribed distance from the fifth rollers  147  and  147 , and are arranged on the one surface  30   a  and the other surface  30   b  of the substrate  30  and support (sandwich) the substrate  30  on the winding side of the substrate  30 . 
     That is, the exposure region α 51  on the supply side of the substrate  30  is formed between the second rollers  144  and  144  and the third rollers  145  and  145 , and the exposure region α 52  on the winding side of the substrate  30  is formed between the fourth rollers  146  and  146  and the fifth rollers  147  and  147 . 
     For example, as shown in  FIG. 14( b ) , in the process of exposing the negative photosensitive resin layer  33 , the second rollers  144  and  144  and the third rollers  145  and  145  are inclined at an arbitrary inclined angle with respect to the Y-axis direction, that is, are inclined upward in the Z-axis direction with a Y axis as its reference, and thus, the substrate  30  is also inclined upward in the Z-axis direction with the Y axis as its reference. Accordingly, the substrate  30  can have an arbitrary inclined angle with respect to the normal direction, similarly to the method for manufacturing the light-diffusing member of the above-described first embodiment. 
     For example, as shown in  FIG. 14( c ) , the fourth rollers  146  and  146  and the fifth rollers  147  and  147  are inclined at an arbitrary inclined angle with respect to the Y-axis direction, that is, are inclined downward in the Z-axis direction with the Y axis as its reference, and thus, the substrate  30  is also inclined downward in the Z-axis direction with the Y axis as its reference. Accordingly, the substrate  30  can have an arbitrary inclined angle with respect to the normal direction, similarly to the method for manufacturing the light-diffusing member of the above-described first embodiment. 
     Therefore, the parallel light F can be applied from the other surface  30   b  in a state in which the substrate  30  has the inclined angle with respect to the normal direction. 
     According to the present embodiment, the substrate  30  is inclined at an arbitrary inclined angle with respect to the Y-axis direction between the second rollers  144  and  144  and the third rollers  145  and  145 , and the substrate  30  is inclined at an arbitrary inclined angle with respect to the Y-axis direction between the fourth rollers  146  and  146  and the fifth rollers  147  and  147 . Thus, the parallel light F can be incident on the negative photosensitive resin layer  33  formed on the other surface  30   a  of the substrate  30  at a prescribed inclined angle. Therefore, it is possible to form the light-diffusing section  34  having a prescribed taper angle. 
     According to the present embodiment, an inclined direction of the substrate  30  between the second rollers  144  and  144  and the third rollers  145  and  145  and an inclined direction of the substrate  30  between the fourth rollers  146  and  146  and the fifth rollers  147  and  147  are different, and thus, it is possible to expose the negative photosensitive resin layer  33  by the parallel light F in two different directions. 
     According to the present embodiment, the light-diffusing member  35  on which the same light-diffusing section  34  as that of the above-described first embodiment is formed is obtained. 
     (8) Eighth Embodiment 
     An eighth embodiment of the method for manufacturing the light-diffusing member will be described with reference to  FIG. 15 . 
     The method for manufacturing the light-diffusing member of the present embodiment is different from the method for manufacturing the light-diffusing member of the above-described first embodiment in that an exposure device  150  shown in  FIG. 15  is used as the exposure device in the process of exposing the negative photosensitive resin layer  33 . Other processes are the same as those in the method for manufacturing the light-diffusing member of the above-described first embodiment. 
     In  FIG. 15 , the same components as those shown in  FIG. 2  will be assigned the same reference numerals, and the description thereof will be omitted. In  FIG. 15 , the light shielding layer  31  and the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  will be omitted. 
     In  FIG. 15 , a direction (direction shown by an arrow in  FIG. 15 ) in which the substrate  30  is transferred is referred to as an X-axis direction, a width direction of the substrate  30  is referred to as a Y-axis direction, and a height direction of the exposure device  150  is referred to as a Z-axis direction. 
     The exposure device  150  schematically includes a light source  151  for irradiating the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  with the parallel light F such as ultraviolet light, and first rollers  152  and  152 , a second roller  153 , a third roller  154 , and fourth rollers  155  and  155  which are arranged so as to correspond to a region (exposure region) α 61  where the negative photosensitive resin layer  33  can be exposed by the light source  151  and sequentially support the substrate  30  in the transfer direction. 
     The light source  151  faces the substrate  30 , and is arranged so as to irradiate the substrate  30  in the transfer direction (X-axis direction) thereof with the parallel light F in a direction perpendicular to the transfer direction (X-axis direction) of the substrate  30 . 
     For example, an ultraviolet lamp is used as the light source  151 . 
     The first rollers  152  and  152  are arranged on the one surface  30   a  and the other surface  30   b  of the substrate  30  and support (sandwich) the substrate  30  on the supply side of the substrate  30 . The first rollers  152  and  152  are arranged near one end (end on the supply side of the substrate  30 ) of the exposure region α 61 . 
     The second roller  153  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the first rollers  152  and  152  and the third roller  154 , is arranged on the one surface  30   a  of the substrate  30  within the exposure region α 61 , and supports the substrate  30 . The second roller  153  moves in the Z-axis direction in line with the third roller  154 , and is arranged higher than the first rollers  152  and  152  and the fourth rollers  155  and  155  in the Z-axis direction. 
     The third roller  154  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the second roller  153  and the fourth rollers  155  and  155 , is arranged on the one surface  30   a  of the substrate  30  within the exposure region α 61 , and supports the substrate  30 . The third roller  154  moves in the Z-axis direction in line with the second roller  153 , and is arranged higher than the first rollers  152  and  152  and the fourth rollers  155  and  155  in the Z-axis direction. 
     The fourth rollers  155  and  155  are arranged in the transfer direction of the substrate  30  with a prescribed distance from the third roller  154  on the winding side of the substrate  30 , are arranged on the one surface  30   a  and the other surface  30   b  of the substrate  30 , and support (sandwich) the substrate  30 . The fourth rollers  155  and  155  are arranged near the other end (end on the winding side of the substrate  30 ) of the exposure region α 61 . 
     In the process of exposing the negative photosensitive resin layer  33 , the positions of the second roller  153  and the third roller  154  move upward in the Z-axis direction (higher than the first rollers  152  and  152  and the fourth rollers  155  and  155  in the Z-axis direction), and thus, the substrate  30  can have an arbitrary inclined angle with respect to the X-axis direction between the first rollers  152  and  152  and the second roller  153  and between the third roller  154  and the fourth rollers  155  and  155 , similarly to the method for manufacturing the light-diffusing member of the above-described first embodiment. Accordingly, the parallel light F can be applied from the other surface  30   b  while the substrate  30  has the inclined angle with respect to the normal direction between the first rollers  152  and  152  and the second roller  153  and between the third roller  154  and the fourth rollers  155  and  155 . 
     In this case, the second roller  153  and the third roller  154  have the same positions (heights with an X axis as its reference). Thus, the substrate  30  passing (transferred) between the second roller  153  and the third roller  154  is in parallel with the X-axis direction. The substrate  30  can be irradiated with the parallel light F in a direction perpendicular to the transfer direction (X-axis direction) between the second roller  153  and the third roller  154 . 
     Here, as in the above-described first embodiment, an exposure state in a case where the substrate  30  on which the negative photosensitive resin layer  33  is formed is irradiated with the parallel light F in two different directions will be examined with reference to  FIGS. 16  and  17 . 
     In  FIGS. 16 and 17 , a width of an opening  31   a  of the light shielding layer  31  is expressed by H, a thickness of the negative photosensitive resin layer  33  is expressed by T, and an angle formed by the parallel light F applied to the negative photosensitive resin layer  33  and a surface (hereinafter, referred to as “one surface”)  33   a  opposite to the substrate  30  of the negative photosensitive resin layer  33  is expressed by θ T . 
     As in the first embodiment, in a case where the substrate  30  on which the negative photosensitive resin layer  33  is formed is irradiated with the parallel light F in two different directions, and in a case where the width H, the thickness T and the angle θ T  satisfy the relationship of H≧2T/tan θ T  as shown in  FIG. 16 , since the parallel light rays F 11  and F 12  which pass through the opening  31   a  of the light shielding layer  31  and are incident on the negative photosensitive resin layer  33  overlap with each other on the one surface  33   a  of the negative photosensitive resin layer  33  in two different directions, there is no region which is not irradiated with the parallel light F. That is, there is no portion which is not exposed on the one surface  33   a  of the negative photosensitive resin layer  33 . 
     In contrast, as in the first embodiment, in a case where the negative photosensitive resin layer  33  is irradiated with the parallel light F in two different directions, and in a case where the width H, the thickness T and the angle θ T  do not satisfy the relationship of H≧2T/tan θ T  as shown in  FIG. 17 , that is, in a case where the width H, the thickness T and the angle θ T  satisfy the relationship of H&lt;2T/tan θ T , since there is a region (region represented by γ in  FIG. 17 ) where the parallel light rays F 11  and F 12  which pass through the opening  31   a  of the light shielding layer  31  and are incident on the negative photosensitive resin layer  33  in two different directions do not overlap with each other on the one surface  33   a  of the negative photosensitive resin layer  33 , there is a region (region represented by γ in  FIG. 17 ) which is not irradiated with the parallel light F. That is, there is a portion which is not exposed on the one surface  33   a  of the negative photosensitive resin layer  33 . 
     This means that a region which is not irradiated with the parallel light F is generated by merely irradiating the negative photosensitive resin layer  33  with the parallel light F in two different directions in a case where the width H of the opening  31   a  is small or a case where the thickness of the negative photosensitive resin layer  33  is thick. 
     Thus, as in the present embodiment, the substrate  30  is arranged (transferred) in parallel with the X-axis direction between the second roller  153  and the third roller  154  within the exposure region α 61 , and thus, the substrate  30  is irradiated with the parallel light F 13  in a direction perpendicular to the transfer direction (X-axis direction) in this portion, as shown in  FIG. 18 . Accordingly, even in a case where the width H, the thickness T and the angle θ T  satisfy the relationship of H&lt;2T/tan θ T , the substrate  30  is irradiated with the parallel light F 13  perpendicular to the transfer direction thereof in the a region of the negative photosensitive resin layer  33  which is not irradiated with the parallel light rays F 11  and F 12  incident in two different directions. Therefore, there is no region which is not exposed on the one surface  33   a  of the negative photosensitive resin layer  33 . By doing this, even though the width H of the opening  31   a  of the light shielding layer  31  or the thickness T of the negative photosensitive resin layer  33  are changed, it is possible to prevent the portion which is not exposed on the one surface  33   a  of the negative photosensitive resin layer  33  from being present. 
     According to the present embodiment, the light-diffusing member  35  on which the same light-diffusing section  34  as that of the above-described first embodiment is formed is obtained. 
     (9) Ninth Embodiment 
     A ninth embodiment of the method for manufacturing the light-diffusing member will be described with reference to  FIG. 19 . 
     The method for manufacturing the light-diffusing member of the present embodiment is different from the method for manufacturing the light-diffusing member of the above-described first embodiment in that an exposure device  160  shown in  FIG. 19  is used as the exposure device in the process of exposing the negative photosensitive resin layer  33 . Other processes are the same as those in the method for manufacturing the light-diffusing member of the above-described first embodiment. 
     In  FIG. 19 , the same components as those shown in  FIG. 2  will be assigned the same reference numerals, and the description thereof will be omitted. In  FIG. 19 , the light shielding layer  31  and the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  will be omitted. 
     In  FIG. 19 , a direction (direction shown by an arrow in  FIG. 19 ) in which the substrate  30  is transferred is referred to as an X-axis direction, a width direction of the substrate  30  is referred to as a Y-axis direction, and a height direction of the exposure device  160  is referred to as a Z-axis direction. 
     The exposure device  160  schematically includes three light sources  161 ,  162  and  163  for irradiating the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  with the parallel light F such as ultraviolet light, and first rollers  164  and  164 , a second roller  165 , a third roller  166 , and fourth rollers  167  and  167  which are arranged so as to correspond to three regions (exposure regions) α 71 , α 72 , and α 73  (hereinafter, referred to as “a first exposure region α 71 , a second exposure region α 72 , and a third exposure region α 73 ”) where the negative photosensitive resin layer  33  can be exposed by the light sources  161 ,  162  and  163  and sequentially support the substrate  30  in the transfer direction. 
     The light sources  161 ,  162  and  163  face the substrate  30 , and are arranged in the transfer direction (X-axis direction) of the substrate  30  with a prescribed distance. The light sources  161 ,  162  and  163  are arranged so as to irradiate the substrate  30  with the parallel light F in a direction perpendicular to the transfer direction (X-axis direction). 
     For example, ultraviolet lamps are used as the light sources  161 ,  162  and  163 . 
     The first rollers  164  and  164  are arranged on the one surface  30   a  and the other surface  30   b  of the substrate  30  and support (sandwich) the substrate  30  on the supply side of the substrate  30 . The first rollers  164  and  164  are arranged near one end (end on the supply side of the substrate  30 ) of the first exposure region α 71 . 
     The second roller  165  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the first rollers  164  and  164  and the third roller  166 , is arranged on the one surface  30   a  of the substrate  30 , and supports the substrate  30 . The second roller  165  is arranged near the other end (end on the winding side of the substrate  30 ) of the first exposure region α 71  and near one end (end on the supply side of the substrate  30 ) of the second exposure region α 72 . The second roller  165  moves in the Z-axis direction in line with the third roller  166 , and is arranged higher than the first rollers  164  and  164  and the fourth rollers  167  and  167  in the Z-axis direction. 
     The third roller  166  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the second roller  165  and the fourth rollers  167  and  167 , is arranged on the one surface  30   a  of the substrate  30 , and supports the substrate  30 . The third roller  166  is arranged near the other end (end on the winding side of the substrate  30 ) of the second exposure region α 72  and near one end (end on the supply side of the substrate  30 ) of the third exposure region α 73 . The third roller  166  moves in the Z-axis direction in line with the second roller  165 , and is arranged higher than the first rollers  164  and  164  and the fourth rollers  167  and  167  in the Z-axis direction. 
     The fourth rollers  167  and  167  are arranged in the transfer direction of the substrate  30  with a prescribed distance from the third roller  166  on the winding side of the substrate  30 , are arranged on the one surface  30   a  and the other surface  30   b  of the substrate  30 , and support (sandwich) the substrate  30 . The fourth rollers  167  and  167  are arranged near the other end (end on the winding side of the substrate  30 ) of the third exposure region α 73 . 
     That is, the first exposure region α 71  is formed between the first rollers  164  and  164  and the second roller  165 , the second exposure region α 72  is formed between the second roller  165  and third roller  166 , and the third exposure region α 73  is formed between the third roller  166  and the fourth rollers  167  and  167 . 
     In the process of exposing the negative photosensitive resin layer  33 , the positions of the second roller  165  and the third roller  166  moves upward in the Z-axis direction (higher than first rollers  164  and  164  and the fourth rollers  167  and  167  in the Z-axis direction), and thus, the substrate  30  can have an arbitrary inclined angle with respect to the X-axis direction between the first rollers  164  and  164  and the second roller  165  and between the third roller  166  and the fourth rollers  167  and  167 , similarly to the method for manufacturing the light-diffusing member of the above-described first embodiment. Accordingly, the parallel light F can be applied from the other surface  30   b  in a state in which the substrate  30  has the inclined angle with respect to the normal direction between the first rollers  164  and  164  and the second roller  165  and between the third roller  166  and the fourth rollers  167  and  167 . 
     In this case, the second roller  165  and the third roller  166  have the same position (height with the X axis as its reference). Thus, the substrate  30  passing (transferred) between the second roller  165  and the third roller  166  is in parallel with the X-axis direction. The substrate  30  can be irradiated with the parallel light F in a direction perpendicular to the transfer direction (X-axis direction) thereof between the second roller  165  and the third roller  166 . 
     According to the present embodiment, the substrate  30  is irradiated with the parallel light F at an arbitrary inclined angle with respect to the X-axis direction in the first exposure region α 71  formed between the first rollers  164  and  164  and the second roller  165 , the substrate  30  is irradiated with the parallel light F in a direction perpendicular to the X-axis direction in the second exposure region α 72  formed between the second roller  165  and the third roller  166 , and the substrate  30  is irradiated with the parallel light F at an arbitrary inclined angle with respect to the X-axis direction in the third exposure region α 73  formed between the third roller  166  and the fourth rollers  167  and  167 . Thus, it is possible to prevent the portion which is not exposed on the one surface  33   a  of the negative photosensitive resin layer  33  formed on the substrate  30  from being present. 
     Since the first exposure region α 71  is formed between the first rollers  164  and  164  and the second roller  165 , the second exposure region α 72  is formed between the second roller  165  and the third roller  166 , and the third exposure region α 73  is formed between the third roller  166  and the fourth rollers  167  and  167 , the parallel light having a prescribed intensity can be incident on the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  without shielding the parallel light emitted from the light sources  161 ,  162  and  163  by the first rollers  164  and  164 , the second roller  165 , the third roller  166  and the fourth rollers  167  and  167  provided in the exposure device  160 . Therefore, it is possible to form the light-diffusing section  34  having a prescribed taper angle. 
     According to the present embodiment, the light-diffusing member  35  on which the same light-diffusing section  34  as that of the above-described first embodiment is formed is obtained. 
     (10) Tenth Embodiment 
     A tenth embodiment of the method for manufacturing the light-diffusing member will be described with reference to  FIG. 20 . 
     The method for manufacturing the light-diffusing member of the present embodiment is different from the method for manufacturing the light-diffusing member of the above-described first embodiment in that an exposure device  170  shown in  FIG. 20  is used as the exposure device in the process of exposing the negative photosensitive resin layer  33 . Other processes are the same as those in the method for manufacturing the light-diffusing member of the above-described first embodiment. 
     In  FIG. 20 , the same components as those shown in  FIG. 2  will be assigned the same reference numerals, and the description thereof will be omitted. In  FIG. 20 , the light shielding layer  31  and the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  will be omitted. 
     In  FIG. 20 , a direction (direction shown by an arrow in  FIG. 20 ) in which the substrate  30  is transferred is referred to as an X-axis direction, a width direction of the substrate  30  is referred to as a Y-axis direction, and a height direction of the exposure device  170  is referred to as a Z-axis direction. 
     The exposure device  170  schematically includes a light source  171  for irradiating the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  with the parallel light F such as ultraviolet light, and first rollers  172  and  172 , a second roller  173 , a third roller  174 , a fourth roller  175  and fifth rollers  176  and  176  which are arranged so as to correspond to a region (exposure region) α 81  where the negative photosensitive resin layer  33  can be exposed by the light source  171  and sequentially support the substrate  30  in the transfer direction. 
     The light source  171  faces the substrate  30 , and is arranged so as to irradiate the substrate  30  in the transfer direction (X-axis direction) thereof with the parallel light F in a direction perpendicular to the transfer direction (X-axis direction) of the substrate  30 . 
     For example, an ultraviolet lamp is used as the light source  171 . 
     The first rollers  172  and  172  are arranged on the one surface  30   a  and the other surface  30   b  of the substrate  30  and support (sandwich) the substrate  30  on the supply side of the substrate  30 . The first rollers  172  and  172  are arranged near one end (end on the supply side of the substrate  30 ) of the exposure region α 81 . 
     The second roller  173  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the first rollers  172  and  172  and the third roller  174 , is arranged on the one surface  30   a  of the substrate  30  within the exposure region α 81 , and supports the substrate  30 . The second roller  173  moves in the Z-axis direction in line with the third roller  174  and the fourth roller  175 , and is arranged higher than the first rollers  172  and  172  and the fifth rollers  176  and  176  in the Z-axis direction and is arranged lower than the third roller  174  in the Z-axis direction. 
     The third roller  174  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the second roller  173  and the fourth roller  175 , is arranged on the one surface  30   a  of the substrate  30  in the center of the exposure region α 81 , and supports the substrate  30 . The third roller  174  moves in the Z-axis direction in line with the second roller  173  and the fourth roller  175 , and is arranged higher than the first rollers  172  and  172 , the second roller  173 , the fourth roller  175  and the fifth rollers  176  and  176  in the Z-axis direction. 
     The fourth roller  175  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the third roller  174  and the fifth rollers  176  and  176 , is arranged on the one surface  30   a  of the substrate  30  within the exposure region α 81 , and supports the substrate  30 . The fourth roller  175  moves in the Z-axis direction in line with the second roller  173  and the third roller  174 , and is arranged higher than the first rollers  172  and  172  and the fifth rollers  176  and  176  in the Z-axis direction and is arranged lower than the third roller  174  in the Z-axis direction. 
     The fifth rollers  176  and  176  are arranged in the transfer direction of the substrate  30  with a prescribed distance from the fourth roller  175  on the winding side of the substrate  30 , are arranged on the one surface  30   a  and the other surface  30   b  of the substrate  30 , and support (sandwich) the substrate  30 . The fifth rollers  176  and  176  are arranged near the other end (end on the winding side of the substrate  30 ) of the exposure region α 81 . 
     In the process of exposing the negative photosensitive resin layer  33 , the positions of the second roller  173  and the fourth roller  175  move upward in the Z-axis direction (higher than the first rollers  172  and  172  and the fifth rollers  176  and  176  in the Z-axis direction and lower than the third roller  174  in the Z-axis direction), and the position of the third roller  174  moves upward in the Z-axis direction (higher than the first rollers  172  and  172 , the second roller  173 , the fourth roller  175 , and the fifth rollers  176  and  176  in the Z-axis direction). Thus, the substrate  30  can have an arbitrary inclined angle with respect to the X-axis direction between the first rollers  172  and  172  and the second roller  173 , between the second roller  173  and the third roller  174 , between the third roller  174  and the fourth roller  175 , and between the fourth roller  175  and the fifth rollers  176  and  176 , similarly to the method for manufacturing the light-diffusing member of the above-described first embodiment. Accordingly, the parallel light F can be applied from the other surface  30   b  in a state in which the substrate  30  has the inclined angle with respect to the normal direction. 
     In this case, the second roller  173  and the fourth roller  175  have the same position (height with the X axis as its reference). By doing this, the incline with respect to the X-axis direction of the substrate  30  between the first rollers  172  and  172  and the second roller  173  and the incline with respect to the X-axis direction of the substrate  30  between the fourth roller  175  and the fifth rollers  176  and  176  can be equal to each other. The incline with respect to the X-axis direction of the substrate  30  between the second roller  173  and the third roller  174  and the incline with respect to the X-axis direction of the substrate  30  between the third roller  174  and the fourth roller  175  can be equal to each other. The incline with respect to the X-axis direction of the substrate  30  between the first rollers  172  and  172  and the second roller  173  and the incline with respect to the X-axis direction of the substrate  30  between the fourth roller  175  and the fifth rollers  176  and  176  (incline A), and the incline with respect to the X-axis direction of the substrate  30  between the second roller  173  and the third roller  174  and the incline with respect to the X-axis direction of the substrate  30  between the third roller  174  and the fourth roller  175  (incline B) can be different from each other. Specifically, for example, the incline A can be greater than the incline B, as shown in  FIG. 20 . Thus, the inclined angle of the parallel light F applied to the substrate  30  between the first rollers  172  and  172  and the second roller  173  and between the fourth roller  175  and the fifth rollers  176  and  176  and the inclined angle of the parallel light F applied to the substrate  30  between the second roller  173  and the third roller  174  and between the third roller  174  and the fourth roller  175  can be different from each other. 
     According to the present embodiment, the inclined angle of the parallel light F applied to the substrate  30  between first rollers  172  and  172  and the second roller  173  and between the fourth roller  175  and the fifth rollers  176  and  176  and the inclined angle of the parallel light F applied to the substrate  30  between the second roller  173  and the third roller  174  and between the third roller  174  and the fourth roller  175  are different from each other, and thus, it is possible to prevent the portion which is not exposed on the one surface  33   a  of the negative photosensitive resin layer  33  formed on the substrate  30  from being present. 
     According to the present embodiment, the light-diffusing member  35  on which the same light-diffusing section  34  as that of the above-described first embodiment is formed is obtained. 
     (11) Eleventh Embodiment 
     An eleventh embodiment of the method for manufacturing the light-diffusing member will be described with reference to  FIG. 21 . 
     The method for manufacturing the light-diffusing member of the present embodiment is different from the method for manufacturing the light-diffusing member of the above-described first embodiment in that an exposure device  180  shown in  FIG. 21  is used as the exposure device in the process of exposing the negative photosensitive resin layer  33 . Other processes are the same as those in the method for manufacturing the light-diffusing member of the above-described first embodiment. 
     In  FIG. 21 , the same components as those shown in  FIG. 2  will be assigned the same reference numerals, and the description thereof will be omitted. In  FIG. 21 , the light shielding layer  31  and the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  will be omitted. 
     In  FIG. 21 , a direction (direction shown by an arrow in  FIG. 21 ) in which the substrate  30  is transferred is referred to as an X-axis direction, a width direction of the substrate  30  is referred to as a Y-axis direction, and a height direction of the exposure device  180  is referred to as a Z-axis direction. 
     The exposure device  180  schematically includes a light source  181  for irradiating the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  with the parallel light F such as ultraviolet light, and first rollers  182  and  182 , a second roller  183 , and third rollers  184  and  184  which are arranged so as to correspond to a region (exposure region) α 91  where the negative photosensitive resin layer  33  can be exposed by the light source  181  and sequentially support the substrate  30  in the transfer direction. 
     The light source  181  faces the substrate  30 , and is arranged so as to irradiate the substrate  30  with the parallel light F in a direction perpendicular to the transfer direction (X-axis direction) thereof. 
     For example, an ultraviolet lamp is used as the light source  181 . 
     The first rollers  182  and  182  are arranged on the one surface  30   a  and the other surface  30   b  of the substrate  30  and support (sandwich) the substrate  30  on the supply side of the substrate  30 . The first rollers  182  and  182  are arranged near one end (end on the supply side of the substrate  30 ) of the exposure region α 91 . 
     The second roller  183  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the first rollers  182  and  182  and the third rollers  184  and  184 , is arranged on the one surface  30   a  of the substrate  30  within the exposure region α 91 , and supports the substrate  30 . The second roller  183  is arranged closer to the winding side of the substrate  30  than the center of the exposure region α 91  within the exposure region α 91 . The second roller  183  moves in the X-axis direction, and is arranged higher than the first rollers  182  and  182  and the third rollers  184  and  184  in the Z-axis direction. 
     The third rollers  184  and  184  are arranged in the transfer direction of the substrate  30  with a prescribed distance from the second roller  183  on the winding side of the substrate  30 , are arranged on the one surface  30   a  and the other surface  30   b  of the substrate  30 , and support (sandwich) the substrate  30 . The third rollers  184  and  184  are arranged near the other end (end on the winding side of the substrate  30 ) of the exposure region α 91 . 
     In the process of exposing the negative photosensitive resin layer  33 , the position of the second roller  183  moves upward in the Z-axis direction (higher than the first rollers  182  and  182  and the third rollers  184  and  184  in the Z-axis direction), and thus, the substrate  30  can have an arbitrary inclined angle with respect to the X-axis direction. Thus, the parallel light F can be applied from the other surface  30   b  in a state in which the substrate  30  has the inclined angle with respect to the normal direction. 
     In this case, since the second roller  183  is arranged closer to the winding side of the substrate  30  than the center of the exposure region α 91  within the exposure region α 91 , the incline with respect to the X-axis direction of the substrate  30  between the first rollers  182  and  182  and the second roller  183  and the incline with respect to the substrate  30  between the second roller  183  and the third rollers  184  and  184  are different from each other, as shown in  FIG. 21 . Accordingly, the inclined angle of the parallel light F applied to the substrate  30  between the first rollers  182  and  182  and the second roller  183  and the inclined angle of the parallel light F applied to the substrate  30  between the second roller  183  and the third rollers  184  and  184  can be different from each other. That is, the inclined angle of the parallel light F with respect to the normal direction of the substrate  30  between the first rollers  182  and  182  and the second roller  183  and the inclined angle of the parallel light F with respect to the normal direction of the substrate  30  between the second roller  183  and the third rollers  184  and  184  can be different from each other. 
     According to the present embodiment, the inclined angle of the parallel light F applied to the substrate  30  between the first rollers  182  and  182  and the second roller  183  and the inclined angle of the parallel light F applied to the substrate  30  between the second roller  183  and the third rollers  184  and  184  are different from each other, and thus, the parallel light F can be incident on the substrate  30  so as to be asymmetrical with respect to the normal direction thereof with the second roller  183  as its boundary. Accordingly, it is possible to expose the negative photosensitive resin layer  33  formed on the substrate  30  so as to be bilaterally asymmetrical with respect to the normal direction of the substrate  30 . 
     That is, according to the present embodiment, the light-diffusing member  35  on which the light-diffusing section  34  in which angles (taper angles) of taper-shaped side surface  34   c   1  and  34   c   2  are bilaterally asymmetrical on the section of the substrate  30  in the normal direction is obtained, as shown in  FIG. 22 . 
     (12) Twelfth Embodiment 
     A twelfth embodiment of the method for manufacturing the light-diffusing member will be described with reference to  FIG. 23 . 
     The method for manufacturing the light-diffusing member of the present embodiment is different from the method for manufacturing the light-diffusing member of the above-described first embodiment in that an exposure device  190  shown in  FIG. 23  is used as the exposure device in the process of exposing the negative photosensitive resin layer  33 . Other processes are the same as those in the method for manufacturing the light-diffusing member of the above-described first embodiment. 
     In  FIG. 23 , the same components as those shown in  FIG. 2  will be assigned the same reference numerals, and the description thereof will be omitted. In  FIG. 23 , the light shielding layer  31  and the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  will be omitted. 
     In  FIG. 23 , a direction (direction shown by an arrow in  FIG. 23 ) in which the substrate  30  is transferred is referred to as an X-axis direction, a width direction of the substrate  30  is referred to as a Y-axis direction, and a height direction of the exposure device  190  is referred to as a Z-axis direction. 
     The exposure device  190  schematically includes a light source  191  for irradiating the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30 , and first rollers  192  and  192 , a second roller  193 , and a third roller  194  which are arranged so as to correspond to a region (exposure region) α 101  where the negative photosensitive resin layer  33  can be exposed by the light source  191  and sequentially support the substrate  30  in the transfer direction. 
     The light source  191  faces the substrate  30 , and is arranged so as to irradiate the substrate  30  with the parallel light F in a direction perpendicular to the transfer direction (X-axis direction). 
     For example, an ultraviolet lamp is used as the light source  191 . 
     The first rollers  192  and  192  are arranged on the one surface  30   a  and the other surface  30   b  of the substrate  30  and support (sandwich) the substrate  30  on the supply side of the substrate  30 . The first rollers  192  and  982  are arranged near one end (end on the supply side of the substrate  30 ) of the exposure region α 101 . 
     The second roller  193  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the first rollers  192  and  192  and the third roller  194 , is arranged on the one surface  30   a  of the substrate  30  within the exposure region α 101 , and supports the substrate  30 . 
     The second roller  193  is arranged closer to the winding side of the substrate  30  than the center of the exposure region α 101  within the exposure region α 101 . The second roller  193  moves in the Z-axis direction in line with the third roller  194 , and is arranged higher than the first rollers  192  and  192  in the Z-axis direction. 
     The third roller  194  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the second roller  193  on the winding side of the substrate  30 , is arranged on the one surface  30   a  of the substrate  30 , and supports the substrate  30 . The third roller  194  moves in the Z-axis direction in line with the second roller  193 , and is arranged higher than the first rollers  192  and  192  in the Z-axis direction. 
     In the process of exposing the negative photosensitive resin layer  33 , the positions of the second roller  193  and the third roller  194  moves upward in the Z-axis direction (higher than the first rollers  192  and  192  in the Z-axis direction), and the second roller  193  and the third roller  194  have the same the positions (height with the X axis as its reference). Thus, the substrate  30  can have an arbitrary inclined angle with respect to the X-axis direction between the first rollers  192  and  192  and the second roller  193 . Accordingly, the parallel light F can be applied from the other surface  30   b  in a state in which the substrate  30  has the inclined angle with respect to the normal direction. 
     The substrate  30  is transferred in parallel with the X-axis direction between the second roller  193  and the third roller  194 . The substrate  30  can be irradiated with the parallel light F from the other surface  30   b  in a direction perpendicular to the transfer direction (X-axis direction) thereof between the second roller  193  and the third roller  194 . 
     According to the present embodiment, the substrate  30  has the inclined angle with respect to the normal direction (is inclined) between the first rollers  192  and  192  and the second roller  193 , and the parallel light F is applied. Thus, the substrate  30  can be irradiated with the parallel light F in parallel with the normal direction between the second roller  193  and the third roller  194 . Accordingly, it is possible to expose the negative photosensitive resin layer  33  formed on the substrate  30  so as to be bilaterally asymmetrical with respect to the normal direction of the substrate  30 . It is possible to adjust the inclined angle with respect to the X-axis direction of the substrate  30  between the first rollers  192  and  192  and the second roller  193  by the positions of the second roller  193  and the third roller  194 . 
     That is, according to the present embodiment, the light-diffusing member  35  on which the light-diffusing section  34  in which angles (taper angles) of taper-shaped side surfaces  34   c   1  and  34   c   2  are laterally asymmetrical is formed on the section of the substrate  30  in the normal direction is obtained, as shown in  FIG. 24 . Specifically, the side surface  34   c   1  of the light-diffusing section  34  has an inclined angle with respect to the normal direction of the substrate  30 , and the side surface  34   c   2  of the light-diffusing section  34  is parallel with the normal direction of the substrate  30 . 
     (13) Thirteenth Embodiment 
     A thirteenth embodiment of the method for manufacturing the light-diffusing member will be described with reference to  FIG. 25 . 
     The method for manufacturing the light-diffusing member of the present embodiment is different from the method for manufacturing the light-diffusing member of the above-described first embodiment in that an exposure device  200  shown in  FIG. 25  is used as the exposure device in the process of exposing the negative photosensitive resin layer  33 . Other processes are the same as those in the method for manufacturing the light-diffusing member of the above-described first embodiment. 
     In  FIG. 25 , the same components as those shown in  FIG. 2  will be assigned the same reference numerals, and the description thereof will be omitted. In  FIG. 25 , the light shielding layer  31  and the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  will be omitted. 
     In  FIG. 25 , a direction (direction shown by an arrow in  FIG. 25 ) in which the substrate  30  is transferred is referred to as an X-axis direction, a width direction of the substrate  30  is referred to as a Y-axis direction, and a height direction of the exposure device  200  is referred to as a Z-axis direction. 
     The exposure device  200  schematically includes a light source  201  for irradiating the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  with the parallel light F such as ultraviolet light, and first rollers  202  and  202 , a second roller  203 , and a third roller  204  which are arranged so as to correspond to a region (exposure region) α 111  where the negative photosensitive resin layer  33  can be exposed by the light source  201  and sequentially support the substrate  30  in the transfer direction. 
     The light source  201  faces the substrate  30 , and is arranged so as to irradiate the substrate  30  with the parallel light F in a direction perpendicular to the transfer direction (X-axis direction). 
     For example, an ultraviolet lamp is used as the light source  201 . 
     The first rollers  202  and  202  are arranged on the one surface  30   a  and the other surface  30   b  of the substrate  30  and support (sandwich) the substrate  30  on the supply side of the substrate  30 . The first rollers  202  and  202  are arranged near one end (end on the supply side of the substrate  30 ) of the exposure region α 111 . 
     The second roller  203  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the first rollers  202  and  202  and the third roller  204 , is arranged on the one surface  30   a  of the substrate  30 , and supports the substrate  30 . The second roller  203  is arranged near the other end (end on the winding side of the substrate  30 ) of the exposure region α 111 . The second roller  203  moves in the Z-axis direction in line with the third roller  204 , and is arranged higher than the first rollers  202  and  202  in the Z-axis direction. 
     The third roller  204  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the second roller  203  on the winding side of the substrate  30 , and is arranged on the one surface  30   a  of the substrate  30  and supports the substrate  30 . The third roller  204  moves in the Z-axis direction in line with the second roller  203 , and is arranged higher than the first rollers  202  and  202  in the Z-axis direction. 
     That is, the exposure region α 111  is formed between the first rollers  202  and  202  and the second roller  203 . 
     In the process of exposing the negative photosensitive resin layer  33 , the positions of the second roller  203  and the third roller  204  move upward in the Z-axis direction (higher than the first rollers  202  and  202  in the Z-axis direction), and the second roller  203  and the third roller  204  have the same position (height with the X axis as its reference). Thus, the substrate  30  can have an arbitrary inclined angle with respect to the X-axis direction between the first rollers  202  and  202  and the second roller  203 . Accordingly, it is possible to apply the parallel light F from the other surface  30   b  in a state in which the normal direction of the substrate  30  has the inclined angle with respect to the normal direction. 
     According to the present embodiment, the substrate  30  has the inclined angle with respect to the normal direction (is inclined) between the first rollers  202  and  202  and the second roller  203 , and the parallel light F can be applied. Thus, the negative photosensitive resin layer  33  formed on the substrate  30  can be exposed by being inclined in one direction with respect to the normal direction of the substrate  30 . It is possible to adjust the inclined angle with respect to the X-axis direction of the substrate  30  between the first rollers  202  and  202  and the second roller  203  by the positions of the second roller  203  and the third roller  204 . 
     That is, according to the present embodiment, the light-diffusing member  35  on which the light-diffusing section  34  in which angles (taper angles) of taper-shaped side surfaces  34   c   1  and  34   c   2  are equal is formed is obtained on the section of the substrate  30  in the normal direction, as shown in  FIG. 26 . Specifically, the side surface  34   c   1  of the light-diffusing section  34  and the side surface  34   c   2  of the light-diffusing section  34  are in parallel with each other. 
     (14) Fourteenth Embodiment 
     A fourteenth embodiment of the method for manufacturing the light-diffusing member will be described with reference to  FIG. 27 . 
     The method for manufacturing the light-diffusing member of the present embodiment is different from the method for manufacturing the light-diffusing member of the above-described first embodiment in that an exposure device  210  shown in  FIG. 27  is used as the exposure device in the process of exposing the negative photosensitive resin layer  33 . Other processes are the same as those in the method for manufacturing the light-diffusing member of the above-described first embodiment. 
     In  FIG. 27 , the same components as those shown in  FIG. 2  will be assigned the same reference numerals, and the description thereof will be omitted. In  FIG. 27 , the light shielding layer  31  and the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  will be omitted. 
     In  FIG. 27 , a direction (direction shown by an arrow in  FIG. 27 ) in which the substrate  30  is transferred is referred to as an X-axis direction, a width direction of the substrate  30  is referred to as a Y-axis direction, and a height direction of the exposure device  210  is referred to as a Z-axis direction. 
     The exposure device  210  schematically includes a light source  211  for irradiating the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  with the parallel light F such as ultraviolet light, a first roller  212 , a second roller  213 , a third roller  214 , and a fourth roller  215  which sequentially support the substrate  30  in the transfer direction, and a prism  216  disposed between the substrate  30  transferred by the rollers and the light source  211 . 
     The light source  211  faces the substrate  30 , and is arranged so as to irradiate the substrate  30  with the parallel light F in a direction perpendicular to the transfer direction (X-axis direction). 
     For example, an ultraviolet lamp is used as the light source  211 . 
     The first roller  212  is arranged on the one surface  30   a  of the substrate  30  and supports the substrate  30  on the supply side of the substrate  30 . 
     The second roller  213  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the first roller  212  and the third roller  214 , is arranged on the one surface  30   a  of the substrate  30 , and supports the substrate  30 . The second roller  213  is arranged near one end (end on the supply side of the substrate  30 ) of a region (exposure region) α 121  where the negative photosensitive rein layer  33  can be exposed by the light source  211 . 
     The third roller  214  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the second roller  213  and the fourth roller  215 , is arranged on the one surface  30   a  of the substrate  30 , and supports the substrate  30 . The third roller  214  is arranged near the other end (end on the winding side of the substrate  30 ) of the exposure region α 121  of the substrate  30 . 
     The fourth roller  215  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the third roller  214 , and is arranged on the one surface  30   a  of the substrate  30  and supports the substrate  30  on the winding side of the substrate  30 . 
     The exposure region α 121  is formed between the second roller  213  and the third roller  214 . 
     The prism  216  has a shape in which the section parallel to the height direction has an isosceles triangle shape. The prism  216  is arranged between the light source  211  and the substrate  30  such that a direction in which an inclined surface  216   a  is present, that is, a longitudinal direction of a base  216   b  is in parallel with the transfer direction (X-axis direction) of the substrate  30 . The prism  216  allows the parallel light F emitted from the light source  211  from the inclined surface  216   a  having an isosceles triangle shape to be incident, refracts the parallel light F, and emits the base surface  216   b  having an isosceles triangle shape. 
     In the process of exposing the negative photosensitive resin layer  33 , if the parallel light F emitted from the light source  211  is incident from the inclined surface  216   a  of the prism  216 , the parallel light is refracted, is inclined toward a central line passing through an apex angle of the prism  216 , is emitted from the bottom surface  216   b , and is incident on the substrate  30  at an inclined angle (so as to be inclined) with respect to the normal direction. More specifically, in  FIG. 28 , in the prism  216 , in a left portion of the central line passing through the apex angle, the parallel light F refracted from the prism  216  is emitted from the bottom surface  216   b  of the prism  216  so as to be inclined toward the central line (right side) passing through the apex angle of the prism  216 . Meanwhile, in  FIG. 28 , in the prism  216 , in a right portion of the central line passing through the apex angle, the parallel light F refracted from the prism  216  is emitted from the bottom surface  216   b  of the prism  216  so as to be inclined toward the central line (left side) passing through the apex angle of the prism  216 . In a case where the inclined angle of the prism  216 , that is, an inclined angle θ p  of the inclined surface  216   a  with respect to the bottom surface  216   b  of the prism  216  is equal in the left and right portions with the central line passing through the apex angle of the prism  216  as its boundary, an inclined angle θ E  of the parallel light F emitted from the bottom surface  216   b  of the prism  216  is also equal in the left and right portions with the central line passing through the apex angle of the prism  216  as its boundary (see  FIG. 29 ). 
     For example, it is assumed that a refractive index of ultraviolet light (wavelength: 365 nm) of the prism  216  is n=1.5. If the inclined angle θ p  of the prism  216  is 6 degrees, the parallel light F of which the inclined angle θ E  is 15 degrees is emitted from the bottom surface  216   b  of the prism  216 . By using the prism  216 , the parallel light F inclined at 15 degrees with respect to the normal direction of the substrate  30  is incident, and is refracted from the inside of the substrate  30 . For this reason, in the negative photosensitive resin layer  33  and the substrate  30 , since the parallel light is inclined at 10 degrees with respect to the normal direction of the substrate  30 , it is possible to set the taper angle of the light-diffusing section  34  to be 80 degrees. As shown in  FIG. 30 , the inclined angle θ p  of the prism  216  and the inclined angle θ E  of the light emitted from the bottom surface  216   b  of the prism  216  are proportional to each other. As shown in  FIG. 31 , the inclined angle θ E  of the light emitted from the bottom surface  216   b  of the prism  216  and the taper angle of the light-diffusing section  34  are inversely proportional to each other. 
     According to the present embodiment, the parallel light F emitted from the light source  211  is refracted using the prism  216 , and thus, the parallel light F can be incident on the substrate  30  at the inclined angle with respect to the normal direction thereof. According to the present embodiment, it is possible to expose the negative photosensitive resin layer  33  by the parallel light F in different two directions. 
     According to the present embodiment, the light-diffusing member  35  on which the same light-diffusing section  34  as that of the above-described first embodiment is formed is obtained. 
     Although it has been described in the present embodiment that one prism  216  is arranged between the second roller  213  and the third roller  214 , the present embodiment is not limited thereto. In the present embodiment, two prisms  216  may be arranged between the second roller  213  and the third roller  214 , three prisms  216  ( 216 A,  216 B and  216 C) may be arranged between the second roller  213  and the third roller  214  as shown in  FIG. 32 , or four or more prisms  216  may be arranged between the second roller  213  and the third roller  214 . 
     (15) Fifteenth Embodiment 
     A fifteenth embodiment of the method for manufacturing the light-diffusing member will be described with reference to  FIGS. 33 to 35 . 
     The method for manufacturing the light-diffusing member of the present embodiment is different from the method for manufacturing the light-diffusing member of the above-described first embodiment in that an exposure device  220  shown in  FIG. 33  is used as the exposure device in the process of exposing the negative photosensitive resin layer  33 . Other processes are the same as those in the method for manufacturing the light-diffusing member of the above-described first embodiment. 
     In  FIG. 33 , the same components as those shown in  FIG. 2  will be assigned the same reference numerals, and the description thereof will be omitted. In  FIG. 33 , the light shielding layer  31  and the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  will be omitted. 
     In  FIG. 33 , a direction (direction shown by an arrow in  FIG. 33 ) in which the substrate  30  is transferred is referred to as an X-axis direction, a width direction of the substrate  30  is referred to as a Y-axis direction, and a height direction of the exposure device  220  is referred to as a Z-axis direction. 
     The exposure device  220  schematically includes a light source  221  for irradiating the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  with the parallel light F such as the ultraviolet light, a first roller  222  and a second roller  223  which sequentially support the substrate  30  in the transfer direction, and a first prism  224 , a second prism  225 , a third prism  226  and a fourth prism  227  which are sequentially arranged so as to be in continuously contact with the substrate  30  in the transfer direction between the substrate  30  transferred by the rollers and the light source. 
     The light source  221  faces the substrate  30 , and is arranged so as to irradiate the substrate  30  with the parallel light F in a direction perpendicular to the transfer direction (X-axis direction). 
     For example, an ultraviolet lamp is used as the light source  221 . 
     The first roller  222  is arranged on the one surface  30   a  of the substrate  30  and supports the substrate  30  on the supply side of the substrate  30 . The first roller  222  is arranged near one end (end on the supply side of the substrate  30 ) of a region (exposure region) α 131  where the negative photosensitive resin layer  33  can be exposed by the light source  221 . 
     The second roller  223  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the first roller  222 , and is arranged on the one surface  30   a  of the substrate  30  and supports the substrate  30  on the winding side of the substrate  30 . The second roller  223  is arranged near the other end (end on the winding side of the substrate  30 ) of the exposure region α 131  of the substrate  30 . 
     That is, the exposure region α 131  is formed between the first roller  222  and the second roller  223 . 
     The first prism  224  has a shape in which the section parallel to the Z-axis direction is a right triangle while being arranged on the substrate  30 . The first prism  224  is arranged on the substrate  30  such that an inclined surface  224   a  is positioned on an upper side in the Z-axis direction and a longitudinal direction of a bottom surface (surface facing the inclined surface  224   a )  224   b  is in parallel with the Y-axis direction. The first prism  224  is arranged in a direction in which the inclined surface  224   a  having a right triangle becomes lower toward the deep side of the paper surface. As shown in  FIG. 34 , the first prism  224  allows the parallel light F emitted from the light source  221  to be incident from the inclined surface  224   a  having a right triangle, refracts the parallel light F, and emits the parallel light from the bottom surface  224   b  having a right triangle. 
     The second prism  225  has a shape in which the section parallel to the Z-axis direction is a right triangle while being arranged on the substrate  30 . The second prism  225  is arranged on the substrate  30  such that an inclined surface  225   a  is positioned on an upper side in the Z-axis direction and a longitudinal direction of a bottom surface (surface facing the inclined surface  225   a )  225   b  is in parallel with the Y-axis direction. The second prism  225  is arranged in a direction in which the inclined surface  225   a  having a right triangle becomes lower toward the front side of the paper surface. As shown in  FIG. 34 , the second prism  225  allows the parallel light F emitted from the light source  221  to be incident from the inclined surface  225   a  having a right triangle, refracts the parallel light F, and emits the parallel light from the bottom surface  225   b  having a right triangle. 
     The third prism  226  has a shape in which the section parallel to the Z-axis direction is a right triangle while being arranged on the substrate  30 . The third prism  226  is arranged on the substrate  30  such that an inclined surface  226   a  is positioned on an upper side in the Z-axis direction and a longitudinal direction of a bottom surface (surface facing the inclined surface  226   a )  226   b  is in parallel with the X-axis direction. The third prism  226  is arranged in a direction in which the inclined surface  226   a  having a right triangle becomes lower toward the supply side of the substrate  30 . As shown in  FIG. 35 , the third prism  226  allows the parallel light F emitted from the light source  221  to be incident from the inclined surface  226   a  having a right triangle, refracts the parallel light F, and emits the parallel light from the bottom surface  226   b  having a right triangle. 
     The fourth prism  227  has a shape in which the section parallel to the Z-axis direction is a right triangle while being arranged on the substrate  30 . The fourth prism  227  is arranged on the substrate  30  such that an inclined surface  227   a  is positioned on an upper side in the Z-axis direction and a longitudinal direction of a bottom surface (surface facing the inclined surface  227   a )  227   b  is in parallel with the X-axis direction. The fourth prism  227  is arranged in a direction in which the inclined surface  227   a  having a right triangle becomes lower toward the winding side of the substrate  30 . As shown in  FIG. 35 , the fourth prism  227  allows the parallel light F emitted from the light source  221  to be incident from the inclined surface  227   a  having a right triangle, refracts the parallel light F, and emits the parallel light from the bottom surface  227   b  having a right triangle. 
     In the process of exposing the negative photosensitive resin layer  33 , if the parallel light F emitted from the light source  221  is incident from the inclined surface  224   a  of the first prism  224  as shown in  FIG. 34( a ) , the parallel light is refracted, is inclined toward the front side of the paper surface in  FIG. 33 , is emitted from the bottom surface  224   b , and is incident on the substrate  30  at an inclined angle (so as to be inclined) with respect to the normal direction thereof. 
     As shown in  FIG. 34( b ) , if the parallel light F emitted from the light source  221  is incident from the inclined surface  225   a  of the second prism  225 , the parallel light is refracted, is inclined toward the deep side of the paper surface in  FIG. 33 , is emitted from the bottom surface  225   b , and is incident on the substrate  30  at an inclined angle (so as to be inclined) with respect to the normal direction thereof. 
     As shown in  FIG. 35( a ) , if the parallel light F emitted from the light source  221  is incident from the inclined surface  226   a  of the third prism  226 , the parallel light is refracted, is inclined toward the winding side of the substrate  30 , is emitted from the bottom surface  226   b , and is incident on the substrate  30  at an inclined angle (so as to be inclined) with respect to the normal direction thereof. 
     As shown in  FIG. 35( b ) , if the parallel light F emitted from the light source  221  is incident from the inclined surface  227   a  of the fourth prism  227 , the parallel light is refracted, is inclined toward the supply side of the substrate  30 , is emitted from the bottom surface  227   b , and is incident on the substrate  30  at an inclined angle (so as to be inclined) with respect to the normal direction thereof. 
     Accordingly, the parallel light F can be applied from the other surface  30   b  in a state in which the substrate  30  has the inclined angle with respect to the normal direction. 
     According to the present embodiment, the parallel light F emitted from the light source  221  is refracted using the first prism  224 , the second prism  225 , the third prism  226  and the fourth prism  227 , and thus, the parallel light F can be incident on the substrate  30  at the inclined angle with respect to the normal direction thereof. According to the present embodiment, it is possible to expose the negative photosensitive resin layer  33  by the parallel light F in four different directions. 
     According to the present embodiment, the light-diffusing member  35  on which the same light-diffusing section  34  of which the taper-shaped side surfaces are inclined in four different directions is obtained. 
     (16) Sixteenth Embodiment 
     A sixteenth embodiment of the method for manufacturing the light-diffusing member will be described with reference to  FIG. 36 . 
     The method for manufacturing the light-diffusing member of the present embodiment is different from the method for manufacturing the light-diffusing member of the above-described first embodiment in that an exposure device  230  shown in  FIG. 36  is used as the exposure device in the process of exposing the negative photosensitive resin layer  33 . Other processes are the same as those in the method for manufacturing the light-diffusing member of the above-described first embodiment. 
     In  FIG. 36 , the same components as those shown in FIG.  2  will be assigned the same reference numerals, and the description thereof will be omitted. In  FIG. 36 , the light shielding layer  31  and the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  will be omitted. 
     In  FIG. 36 , a direction (direction shown by an arrow in  FIG. 36 ) in which the substrate  30  is transferred is referred to as an X-axis direction, a width direction of the substrate  30  is referred to as a Y-axis direction, and a height direction of the exposure device  230  is referred to as a Z-axis direction. 
     The exposure device  230  schematically includes a light source  231  for irradiating the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  with the parallel light F such as the ultraviolet light, a first roller  232  and a second roller  233  which sequentially support the substrate  30  in the transfer direction, and a first prism  234 , a second prism  235 , a third prism  236 , a fourth prism  237 , a fifth prism  238 , a sixth prism  239  and a seventh prism  240  which are sequentially arranged so as to be in continuously contact with the substrate  30  in the transfer direction between the substrate  30  transferred by the rollers and the light source. 
     The light source  231  faces the substrate  30 , and is arranged so as to irradiate the substrate  30  with the parallel light F in a direction perpendicular to the transfer direction (X-axis direction). 
     For example, an ultraviolet lamp is used as the light source  231 . 
     The first roller  232  is arranged on the one surface  30   a  of the substrate  30  and supports the substrate  30  on the supply side of the substrate  30 . The first roller  232  is arranged near one end (end on the supply side of the substrate  30 ) of a region (exposure region) α 141  where the negative photosensitive resin layer  33  can be exposed by the light source  231 . 
     The second roller  233  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the first roller  232 , and is arranged on the one surface  30   a  of the substrate  30  and supports the substrate  30  on the winding side of the substrate  30 . The second roller  233  is arranged near the other end (end on the winding side of the substrate  30 ) of the exposure region α 141  of the substrate  30 . 
     That is, the exposure region α 141  is formed between the first roller  232  and the second roller  233 . 
     The first prism  234  has a saw blade shape such that unit shapes in which the section parallel to the Z-axis direction is a right triangle while being arranged on the substrate  30  are in continuously contact with one other in parallel. The first prism  234  is arranged on the substrate  30  such that an inclined surface  234   a  having a saw blade shape is positioned on an upper side in the Z-axis direction and a direction in which the unit shapes having a right triangle are in continuously contact with one another in parallel is in parallel with the Y-axis direction. The first prism  234  is arranged in a direction in which the inclined surface  234   a  having a right triangle becomes lower toward the deep side of the paper surface. The first prism  234  allows the parallel light F emitted from the light source  231  to be inclined from the inclined surface  234   a  having a right triangle (surface having a saw blade shape), refracts the parallel light F, and emits the parallel light from the bottom surface of the right triangle. 
     The second prism  235  has a saw blade shape such that unit shapes in which the section parallel to the Z-axis direction is a right triangle while being arranged on the substrate  30  are in continuously contact with one other in parallel. The second prism  235  is arranged on the substrate  30  such that an inclined surface  235   a  having a saw blade shape is positioned on an upper side in the Z-axis direction and a direction in which the unit shapes having a right triangle are in continuously contact with one another in parallel is in parallel with the Y-axis direction. The second prism  235  is arranged in a direction in which the inclined surface  235   a  having a right triangle becomes lower toward the deep side of the paper surface. The second prism  235  allows the parallel light F emitted from the light source  231  to be inclined from the inclined surface  235   a  having a right triangle (surface having a saw blade shape), refracts the parallel light F, and emits the parallel light from the bottom surface of the right triangle. The second prism  235  is arranged so as to be deviated from the first prism  234  such that the saw blade shape does not overlap with the first prism  234 . 
     The third prism  236  has a saw blade shape such that unit shapes in which the section parallel to the Z-axis direction is a right triangle while being arranged on the substrate  30  are in continuously contact with one other in parallel. The third prism  236  is arranged on the substrate  30  such that an inclined surface  236   a  having a saw blade shape is positioned on an upper side in the Z-axis direction and a direction in which the unit shapes having a right triangle are in continuously contact with one another in parallel is in parallel with the Y-axis direction. The third prism  236  is arranged in a direction in which the inclined surface  236   a  having a right triangle becomes lower toward the deep side of the paper surface. The third prism  236  allows the parallel light F emitted from the light source  231  to be inclined from the inclined surface  236   a  having a right triangle (surface having a saw blade shape), refracts the parallel light F, and emits the parallel light from the bottom surface of the right triangle. The third prism  236  is arranged so as to be deviated from the second prism  235  such that the saw blade shape does not overlap with the second prism  235 . 
     The fourth prism  237  has a shape in which the section parallel to the Z-axis direction is a right triangle while being arranged on the substrate  30 . The fourth prism  237  is arranged on the substrate  30  such that an inclined surface  237   a  is positioned on an upper side in the Z-axis direction and a longitudinal direction of a bottom surface (surface facing the inclined surface  237   a ) is in parallel with the X-axis direction. The fourth prism  237  is arranged in a direction in which the inclined surface  237   a  having a right triangle becomes lower toward the supply side of the substrate  30 . The fourth prism  237  allows the parallel light F emitted from the light source  231  to be inclined from the inclined surface  237   a  having a right triangle, refracts the parallel light F, and emits the parallel light from the bottom surface of the right triangle. 
     The fifth prism  238  has a shape in which the section parallel to the Z-axis direction is a right triangle while being arranged on the substrate  30 . The fifth prism  238  is arranged on the substrate  30  such that an inclined surface  238   a  is positioned on an upper side in the Z-axis direction and a longitudinal direction of a bottom surface (surface facing the inclined surface  238   a ) is in parallel with the X-axis direction. The fifth prism  238  is arranged in a direction in which the inclined surface  238   a  having a right triangle becomes lower toward the winding side of the substrate  30 . The fifth prism  238  allows the parallel light F emitted from the light source  231  to be inclined from the inclined surface  238   a  having a right triangle, refracts the parallel light F, and emits the parallel light from the bottom surface of the right triangle. 
     The sixth prism  239  has a shape in which the section parallel to the Z-axis direction is a right triangle while being arranged on the substrate  30 . The sixth prism  239  is arranged on the substrate  30  such that an inclined surface  239   a  is positioned on an upper side in the Z-axis direction and a longitudinal direction of a bottom surface (surface facing the inclined surface  239   a ) is in parallel with the X-axis direction. The sixth prism  239  is arranged in a direction in which the inclined surface  239   a  having a right triangle becomes lower toward the supply side of the substrate  30 . The sixth prism  239  allows the parallel light F emitted from the light source  231  to be inclined from the inclined surface  239   a  having a right triangle, refracts the parallel light F, and emits the parallel light from the bottom surface of the right triangle. 
     The seventh prism  240  has a shape in which the section parallel to the Z-axis direction is a right triangle while being arranged on the substrate  30 . The seventh prism  240  is arranged on the substrate  30  such that an inclined surface  240   a  is positioned on an upper side in the Z-axis direction and a longitudinal direction of a bottom surface (surface facing the inclined surface  240   a ) is in parallel with the X-axis direction. The seventh prism  240  is arranged in a direction in which the inclined surface  240   a  having a right triangle becomes lower toward the winding side of the substrate  30 . The seventh prism  240  allows the parallel light F emitted from the light source  231  to be inclined from the inclined surface  240   a  having a right triangle, refracts the parallel light F, and emits the parallel light from the bottom surface of the right triangle. 
     In the process of exposing the negative photosensitive resin layer  33 , if the parallel light F emitted from the light source  231  is incident from the inclined surface  234   a  of the first prism  234 , the inclined surface  235   a  of the second prism  235 , and the inclined surface  236   a  of the third prism  236 , the parallel light is refracted, is inclined toward the front side of the paper surface in  FIG. 36 , is emitted from the bottom surface, and is incident on the substrate  30  at the inclined angle (so as to be inclined) with respect to the normal direction. 
     If the parallel light F emitted from the light source  231  is incident from the inclined surface  237   a  of the fourth prism  237  and the inclined surface  239   a  of the sixth prism  239 , the parallel light is refracted, is inclined toward the take-out side of the substrate  30 , is emitted from the bottom surface, and is incident on the substrate  30  at the inclined angle (so as to be inclined) with respect to the normal direction. 
     If the parallel light F emitted from the light source  231  is incident from the inclined surface  238   a  of the fifth prism  238  and the inclined surface  240   a  of the seventh prism  240 , the parallel light is refracted, is inclined toward the supply side of the substrate  30 , is emitted from the bottom surface, and is incident on the substrate  30  at the inclined angle (so as to be inclined) with respect to the normal direction. 
     Accordingly, the parallel light F can be applied from the other surface  30   b  in a state in which the substrate  30  has the inclined angle with respect to the normal direction. 
     According to the present embodiment, the parallel light F emitted from the light source  231  is refracted using the first prism  234 , the second prism  235 , the third prism  236 , the fourth prism  237 , the fifth prism  238 , the sixth prism  239 , the seventh prism  240 , and thus, the parallel light F can be incident on the substrate  30  at the inclined angle with respect to the normal direction thereof. According to the present embodiment, it is possible to expose the negative photosensitive resin layer  33  by using the parallel light F in three different directions. 
     According to the present embodiment, the light-diffusing member  35  on which the same light-diffusing section  34  of which the taper-shaped side surfaces are inclined in three different directions is formed is obtained. 
     Although it has been described in the present embodiment that the first prism  234 , the second prism  235  and the third prism  236  which have the saw blade shape are arranged between the first roller  232  and the second roller  233 , the present embodiment is not limited thereto. In the present embodiment, two prisms having a saw blade shape may be arranged between the first roller  232  and the second roller  233 , or four or more prisms having a saw blade shape may be arranged between the first roller  232  and the second roller  233 . 
     Although it has been described in the present embodiment that the fourth prism  237 , the fifth prism  238 , the sixth prism  239  and the seventh prism  240  which have a shape in which the section parallel to the Z-axis direction is a right triangle are arranged between the first roller  232  and the second roller  233 , the present embodiment is not limited thereto. Two prisms which have a shape in which the section parallel to the Z-axis direction is a right triangle may be arranged between the first roller  232  and the second roller  233 , or an even number (six or more) of prisms which have a shape in which the section parallel to the Z-axis direction is a right triangle may be arranged between the first roller  232  and the second roller  233 . 
     (17) Seventeenth Embodiment 
     A seventeenth embodiment of the method for manufacturing the light-diffusing member will be described with reference to  FIG. 37 . 
     The method for manufacturing the light-diffusing member of the present embodiment is different from the method for manufacturing the light-diffusing member of the above-described first embodiment in that an exposure device  250  shown in  FIG. 37  is used as the exposure device in the process of exposing the negative photosensitive resin layer  33 . Other processes are the same as those in the method for manufacturing the light-diffusing member of the above-described first embodiment. 
     In  FIG. 37 , the same components as those shown in  FIG. 2  will be assigned the same reference numerals, and the description thereof will be omitted. In  FIG. 37 , the light shielding layer  31  and the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  will be omitted. 
     In  FIG. 37 , a direction (direction shown by an arrow in  FIG. 37 ) in which the substrate  30  is transferred is referred to as an X-axis direction, a width direction of the substrate  30  is referred to as a Y-axis direction, and a height direction of the exposure device  250  is referred to as a Z-axis direction. 
     The exposure device  250  schematically includes a light source  251  for irradiating the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  with the parallel light such as the ultraviolet light, a first roller  252  and a second roller  253  which are arranged so as to correspond to a region (exposure region) α 151  where the negative photosensitive resin layer  33  can be exposed by the light source  251  and sequentially support the substrate  30  in the transfer direction, and a first prism  254  and a second prism  255  which are sequentially arranged so as to be in continuously contact with the substrate  30  in the transfer direction between the substrate  30  transferred by the rollers and the light source. 
     The light source  251  faces the substrate  30 , and is arranged so as to irradiate the substrate  30  with the parallel light F in a direction perpendicular to the transfer direction (X-axis direction). 
     For example, an ultraviolet lamp is used as the light source  251 . 
     The first roller  252  is arranged on the one surface  30   a  of the substrate  30  and supports the substrate  30  on the supply side of the substrate  30 . The first roller  252  is arranged near one end (end on the supply side of the substrate  30 ) of the region (exposure region) α 151  where the negative photosensitive resin layer  33  can be exposed by the light source  251 . 
     The second roller  253  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the first roller  252 , and is arranged on the one surface  30   a  of the substrate  30  and supports the substrate  30  on the winding side of the substrate  30 . The second roller  253  is arranged near the other end (end on the winding side of the substrate  30 ) of the exposure region α 151  of the substrate  30 . 
     That is, the exposure region α 151  is formed between the first roller  252  and the second roller  253 . 
     The first prism  254  has a shape in which the section parallel to the Z-axis direction is a right triangle while being arranged on the substrate  30 . The first prism  254  is arranged on the substrate  30  such that an inclined surface  254   a  is positioned on an upper side in the Z-axis direction and a longitudinal direction of a bottom surface (surface facing the inclined surface  254   a )  254   b  is in parallel with the X-axis direction. The first prism  254  is arranged in a direction in which the inclined surface  254   a  having a right triangle becomes lower toward the supply side of the substrate  30 . The first prism  254  allows the parallel light F emitted from the light source  251  to be inclined from the inclined surface  254   a  having a right triangle, refracts the parallel light F, and emits the parallel light from the bottom surface  254   b  of the right triangle. 
     The second prism  255  has a shape in which the section parallel to the Z-axis direction is a right triangle while being arranged on the substrate  30 . The second prism  255  is arranged on the substrate  30  such that an inclined surface  255   a  is positioned on an upper side in the Z-axis direction and a longitudinal direction of a bottom surface (surface facing the inclined surface  255   a )  255   b  is in parallel with the X-axis direction. The second prism  255  is arranged in a direction in which the inclined surface  255   a  having a right triangle becomes lower toward the winding side of the substrate  30 . The second prism  255  allows the parallel light F emitted from the light source  251  to be inclined from the inclined surface  255   a  having a right triangle, refracts the parallel light F, and emits the parallel light from the bottom surface  255   b  of the right triangle. 
     As shown in  FIG. 37 , the shape of the first prism  254  and the shape of the second prism  255  are different, and the inclined angle with respect to the X-axis direction of the inclined surface  254   a  of the first prism  254  and the inclined surface with respect to the X-axis direction of the inclined surface  255   a  of the second prism  255  are different. 
     The first prism  254  and the second prism  255  are arranged between the first roller  252  and the second roller  253  in the X-axis direction. 
     In the process of exposing the negative photosensitive resin layer  33 , if the parallel light F emitted from the light source  251  is incident from the inclined surface  254   a  of the first prism  254 , the parallel light is refracted, is inclined toward the winding side of the substrate  30 , is emitted from the bottom surface  254   b  of the first prism  254 , and is incident on the substrate  30  at the inclined angle (so as to be inclined) with respect to the normal direction. 
     If the parallel light F emitted from the light source  251  is incident from the inclined surface  255   a  of the second prism  255 , the parallel light is refracted, is inclined toward the supply side of the substrate  30 , is emitted from the bottom surface  255   b  of the second prism  255 , and is incident on the substrate  30  at the inclined angle (so as to be inclined) with respect to the normal direction. 
     Accordingly, the parallel light F can be applied from the other surface  30   b  in a state in which the substrate  30  has the inclined angle with respect to the normal direction. 
     According to the present embodiment, the parallel light F emitted from the light source  251  is refracted using the first prism  254  and the second prism  255 , and thus, the parallel light F can be incident on the substrate  30  at the inclined angle with respect to the normal direction thereof. According to the present embodiment, it is possible to expose the negative photosensitive resin layer  33  by using the parallel light F in two different directions. 
     According to the present embodiment, the light-diffusing member  35  on which the same light-diffusing section  34  in which angles (taper angles) of taper-shaped side surfaces  34   c   1  and  34   c   2  are bilaterally asymmetrical is formed is obtained on the section of the substrate  30  in the normal direction, as shown in  FIG. 22 . 
     Although it has been described in the present embodiment that the first prism  254  and the second prism  255  which have a shape in which the section parallel to the Z-axis direction is a right triangle and have different shapes are arranged between the first roller  252  and the second roller  253 , the present embodiment is not limited thereto. In the present embodiment, an even number (four or more) of prisms which have a shape in which the section parallel to the Z-axis direction is a right triangle may be arranged between the first roller  252  and the second roller  253 . 
     Although it has been described in the present embodiment that the first prism  254  is larger than the second prism  255 , the present embodiment is not limited thereto. In the present embodiment, the second prism  255  may be larger than the first prism  254 . 
     (18) Eighteenth Embodiment 
     An eighteenth embodiment of the method for manufacturing the light-diffusing member will be described with reference to  FIG. 38 . 
     The method for manufacturing the light-diffusing member of the present embodiment is different from the method for manufacturing the light-diffusing member of the above-described first embodiment in that an exposure device  260  shown in  FIG. 38  is used as the exposure device in the process of exposing the negative photosensitive resin layer  33 . Other processes are the same as those in the method for manufacturing the light-diffusing member of the above-described first embodiment. 
     In  FIG. 38 , the same components as those shown in  FIG. 2  will be assigned the same reference numerals, and the description thereof will be omitted. In  FIG. 38 , the light shielding layer  31  and the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  will be omitted. 
     In  FIG. 38 , a direction (direction shown by an arrow in  FIG. 38 ) in which the substrate  30  is transferred is referred to as an X-axis direction, a width direction of the substrate  30  is referred to as a Y-axis direction, and a height direction of the exposure device  260  is referred to as a Z-axis direction. 
     The exposure device  260  schematically includes a light source  261  for irradiating the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  with the parallel light F such as the ultraviolet light, a first roller  262  and a second roller  263  which are arranged so as to correspond to a region (exposure region) α 161  where the negative photosensitive resin layer  33  can be exposed by the light source  261  and sequentially support the substrate  30  in the transfer direction, and a prism  264  which is arranged between the substrate  30  transferred by the rollers and the light source. 
     The light source  261  faces the substrate  30 , and is arranged so as to irradiate the substrate  30  with the parallel light F in a direction perpendicular to the transfer direction (X-axis direction). 
     For example, an ultraviolet lamp is used as the light source  261 . 
     The first roller  262  is arranged on the one surface  30   a  of the substrate  30  and supports the substrate  30  on the supply side of the substrate  30 . The first roller  262  is arranged near one end (end on the supply side of the substrate  30 ) of the region (exposure region) α 161  where the negative photosensitive resin layer  33  can be exposed by the light source  261 . 
     The second roller  263  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the first roller  262 , and is arranged on the one surface  30   a  of the substrate  30  and supports the substrate  30  on the winding side of the substrate  30 . The second roller  263  is arranged near the other end (end on the winding side of the substrate  30 ) of the exposure region α 161  of the substrate  30 . 
     That is, the exposure region α 161  is formed between the first roller  262  and the second roller  263 . 
     The prism  264  has a shape in which the section parallel to the Z-axis direction is a right triangle while being arranged on the substrate  30 . The prism  264  is arranged on the substrate  30  such that an inclined surface  264   a  is positioned on an upper side in the Z-axis direction and a longitudinal direction of a bottom surface (surface facing the inclined surface  264   a )  264   b  is in parallel with the X-axis direction. The prism  264  is arranged in a direction in which the inclined surface  264   a  having a right triangle becomes lower toward the winding side of the substrate  30 . The prism  264  allows the parallel light F emitted from the light source  261  to be inclined from the inclined surface  264   a  having a right triangle, refracts the parallel light F, and emits the parallel light from the bottom surface  264   b  of the right triangle. 
     The prism  264  is arranged between the first roller  262  and the second roller  263  in the X-axis direction. 
     The prism  264  is arranged such that a part (front end  264   c ) protrudes from the exposure region α 161 . 
     In the process of exposing the negative photosensitive resin layer  33 , if the parallel light F emitted from the light source  261  is incident in parallel with the normal direction of the substrate  30  in a region (left region of the exposure region α 161  in  FIG. 38 ) of the exposure region α 161  where the prism  264  is not arranged and the parallel light F emitted from the light source  261  is incident from the inclined surface  264   a  of the prism  264  in a region (right region of the exposure region α 161  in  FIG. 38 ) where the prism  264  is arranged, the parallel light is refracted, is inclined toward the supply side of the substrate  30 , is emitted from the bottom surface  264   b  of the prism  264 , and is incident on the substrate  30  at the inclined angle (so as to be inclined) with respect to the normal direction. 
     According to the present embodiment, the light parallel light F is applied in parallel with the normal direction of the substrate  30  in a region of the exposure region α 161  where the prism  264  is not arranged, and the parallel light F can be applied at the inclined angle (so as to be inclined) with respect to the normal direction of the substrate  30  in a region where the prism  264  is arranged. Thus, it is possible to expose the negative photosensitive resin layer  33  so as to be bilaterally asymmetrical with respect to the normal direction of the substrate  30 . 
     That is, according to the present embodiment, the light-diffusing member  35  on which the same light-diffusing section  34  in which angles (taper angles) of taper-shaped side surfaces  34   c   1  and  34   c   2  are bilaterally asymmetrical is formed is obtained on the section of the substrate  30  in the normal direction, as shown in  FIG. 24 . Specifically, the side surface  34   c   1  of the light-diffusing section  34  has an inclined angle with respect to the normal direction of the substrate  30 , and the side surface  34   c   2  of the light-diffusing section  34  is in parallel with the normal direction of the substrate  30 . 
     (19) Nineteenth Embodiment 
     A nineteenth embodiment of the method for manufacturing the light-diffusing member will be described with reference to  FIG. 39 . 
     The method for manufacturing the light-diffusing member of the present embodiment is different from the method for manufacturing the light-diffusing member of the above-described first embodiment in that an exposure device  270  shown in  FIG. 39  is used as the exposure device in the process of exposing the negative photosensitive resin layer  33 . Other processes are the same as those in the method for manufacturing the light-diffusing member of the above-described first embodiment. 
     In  FIG. 39 , the same components as those shown in  FIG. 2  will be assigned the same reference numerals, and the description thereof will be omitted. In  FIG. 39 , the light shielding layer  31  and the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  will be omitted. 
     In  FIG. 39 , a direction (direction shown by an arrow in  FIG. 39 ) in which the substrate  30  is transferred is referred to as an X-axis direction, a width direction of the substrate  30  is referred to as a Y-axis direction, and a height direction of the exposure device  270  is referred to as a Z-axis direction. 
     The exposure device  270  schematically includes a light source  271  for irradiating the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  with the parallel light F such as the ultraviolet light, a first roller  272  and a second roller  273  which are arranged so as to correspond to a region (exposure region) α 171  where the negative photosensitive resin layer  33  can be exposed by the light source  271  and sequentially support the substrate  30  in the transfer direction, and a prism  274  which is arranged between the substrate  30  transferred by the rollers and the light source. 
     The light source  271  faces the substrate  30 , and is arranged so as to irradiate the substrate  30  with the parallel light F in a direction perpendicular to the transfer direction (X-axis direction). 
     For example, an ultraviolet lamp is used as the light source  271 . 
     The first roller  272  is arranged on the one surface  30   a  of the substrate  30  and supports the substrate  30  on the supply side of the substrate  30 . The first roller  272  is arranged near one end (end on the supply side of the substrate  30 ) of the region (exposure region) α 171  where the negative photosensitive resin layer  33  can be exposed by the light source  271 . 
     The second roller  273  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the first roller  272 , and is arranged on the one surface  30   a  of the substrate  30  and supports the substrate  30  on the winding side of the substrate  30 . The second roller  273  is arranged near the other end (end on the winding side of the substrate  30 ) of the exposure region α 171  of the substrate  30 . 
     That is, the exposure region α 171  is formed between the first roller  272  and the second roller  273 . 
     The prism  274  has a shape in which the section parallel to the Z-axis direction is a right triangle while being arranged on the substrate  30 . The prism  274  is arranged on the substrate  30  such that an inclined surface  274   a  is positioned on an upper side in the Z-axis direction and a longitudinal direction of a bottom surface (surface facing the inclined surface  274   a )  274   b  is in parallel with the X-axis direction. The prism  274  is arranged in a direction in which the inclined surface  274   a  having a right triangle becomes lower toward the winding side of the substrate  30 . The prism  274  allows the parallel light F emitted from the light source  271  to be inclined from the inclined surface  274   a  having a right triangle, refracts the parallel light F, and emits the parallel light from the bottom surface  274   b  of the right triangle. 
     The prism  274  is arranged between the first roller  272  and the second roller  273  in the X-axis direction. 
     The prism  274  is arranged such that a part (front end  264   c  and rear end  264   d ) protrudes from the exposure region α 171 . 
     In the process of exposing the negative photosensitive resin layer  33 , if the parallel light F emitted from the light source  271  is incident from the inclined surface  274   a  of the prism  274 , the parallel light is refracted, is inclined toward the supply side of the substrate  30 , is emitted from the bottom surface  274   b  of the prism  274 , and is incident on the substrate  30  at the inclined angle (so as to be inclined) with respect to the normal direction. 
     Accordingly, the parallel light F can be applied from the other surface  30   b  in a state in which the substrate  30  has the inclined angle with respect to the normal direction. 
     According to the present embodiment, the parallel light F can be applied between the first roller  272  and the second roller  273  at the inclined angle (so as to be inclined) with respect to the normal direction of the substrate  30 . Accordingly, it is possible to expose the negative photosensitive resin layer  33  by being inclined in one direction with respect to the normal direction of the substrate  30 . 
     According to the present embodiment, the light-diffusing member  35  on which the same light-diffusing section  34  in which angles (taper angles) of taper-shaped side surfaces  34   c   1  and  34   c   2  are equal is formed is obtained on the section of the substrate  30  in the normal direction, as shown in  FIG. 26 . Specifically, the side surface  34   c   1  of the light-diffusing section  34  and the side surface  34   c   2  of the light-diffusing section  34  are in parallel with each other. 
     (20) Twentieth Embodiment 
     A twentieth embodiment of the method for manufacturing the light-diffusing member will be described with reference to  FIGS. 40 to 42 . 
     The method for manufacturing the light-diffusing member of the present embodiment is different from the method for manufacturing the light-diffusing member of the above-described first embodiment in that an exposure device  280  shown in  FIG. 40  is used as the exposure device in the process of exposing the negative photosensitive resin layer  33 . Other processes are the same as those in the method for manufacturing the light-diffusing member of the above-described first embodiment. 
     In  FIG. 40 , the same components as those shown in  FIG. 2  will be assigned the same reference numerals, and the description thereof will be omitted. In  FIG. 40 , the light shielding layer  31  and the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  will be omitted. 
     In  FIG. 40 , a direction (direction shown by an arrow in  FIG. 40 ) in which the substrate  30  is transferred is referred to as an X-axis direction, a width direction of the substrate  30  is referred to as a Y-axis direction, and a height direction of the exposure device  280  is referred to as a Z-axis direction. 
     The exposure device  280  schematically includes a light source  281  for irradiating the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  with the parallel light F such as the ultraviolet light, a first roller  282 , a second roller  283 , a third roller  284 , and a fourth roller  285  which are arranged so as to correspond to a region (exposure region) α 181  where the negative photosensitive resin layer  33  can be exposed by the light source  281  and sequentially support the substrate  30  in the transfer direction. 
     The light source  281  faces the substrate  30 , and is arranged so as to face the substrate  30 . 
     As shown in  FIG. 41 , the light source  281  includes a plurality of unit light sources  286  which is arranged adjacent to one another. 
     For example, the light source  281  is obtained by using a small-sized ultraviolet lamp as the unit light source  286  and arranging a plurality of small-sized ultraviolet lamps so as to be adjacent to one another. 
     As shown in  FIG. 42 , each of the unit light sources  286  moves at an arbitrary inclined angle with respect to the X-axis direction and the Y-axis direction, and the substrate  30  is irradiated with the parallel light F at an arbitrary inclined angle. 
     The first roller  282  is arranged on the one surface  30   a  of the substrate  30  and supports the substrate  30  on the supply side of the substrate  30 . 
     The second roller  283  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the first roller  282 , is arranged on the one surface  30   a  of the substrate  30 , and supports the substrate  30 . The second roller  283  is arranged near one end (end on the supply side of the substrate  30 ) of the region (exposure region) α 181  where the negative photosensitive resin layer  33  can be exposed by the light source  281 . 
     The third roller  284  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the second roller  283  and the fourth roller  285 , is arranged on the one surface  30   a  of the substrate  30 , and supports the substrate  30 . The third roller  284  is arranged near the other end (end on the winding side of the substrate  30 ) of the exposure region α 181  of the substrate  30 . 
     The fourth roller  285  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the third roller  284 , and is arranged on the one surface  30   a  of the substrate  30  and supports the substrate  30  on the winding side of the substrate  30 . 
     The exposure region α 181  is formed between the second roller  283  and the third roller  284 . 
     In the process of exposing the negative photosensitive resin layer  33 , the plurality of unit light sources  286  constituting the light source  281  moves in the X-axis direction and the Y-axis direction of the substrate  30  at an arbitrary inclined angle, and thus, the parallel light F is applied at an arbitrary inclined angle with respect to the X-axis direction of the substrate  30 . Accordingly, the parallel light F can be applied from the other surface  30   b  in a state in which the substrate  30  has the inclined angle with respect to the normal direction. All the plurality of unit light sources  286  may simultaneously move in the same direction, or may randomly move in different directions. 
     According to the present embodiment, the parallel light F can be applied between the second roller  283  and the third roller  284  at the inclined angle (so as to be inclined) with respect to the normal direction of the substrate  30 . Accordingly, it is possible to expose the negative photosensitive resin layer  33  at the inclined angle in two or more different directions with respect to the normal direction of the substrate  30 . 
     According to the present embodiment, the light-diffusing member  35  on which the same light-diffusing section  34  of which the taper-shaped side surfaces are inclined in two or more different directions is formed is obtained. 
     (21) Twenty-First Embodiment 
     A twenty-first embodiment of the method for manufacturing the light-diffusing member will be described with reference to  FIGS. 43 and 44 . 
     The method for manufacturing the light-diffusing member of the present embodiment is different from the method for manufacturing the light-diffusing member of the above-described first embodiment in that an exposure device  290  shown in  FIG. 43  is used as the exposure device in the process of exposing the negative photosensitive resin layer  33 . Other processes are the same as those in the method for manufacturing the light-diffusing member of the above-described first embodiment. 
     In  FIG. 43 , the same components as those shown in  FIG. 2  will be assigned the same reference numerals, and the description thereof will be omitted. In  FIG. 43 , the light shielding layer  31  and the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  will be omitted. 
     In  FIG. 43 , a direction (direction shown by an arrow in  FIG. 43 ) in which the substrate  30  is transferred is referred to as an X-axis direction, a width direction of the substrate  30  is referred to as a Y-axis direction, and a height direction of the exposure device  290  is referred to as a Z-axis direction. 
     The exposure device  290  schematically includes a light source  291  for irradiating the negative photosensitive resin layer  33  formed on the one surface  30   a  of the substrate  30  with the parallel light F such as the ultraviolet light, and a first roller  292 , a second roller  293 , a third roller  294 , and a fourth roller  295  which are arranged so as to correspond to a region (exposure region) α 191  where the negative photosensitive resin layer  33  can be exposed by the light source  291  and sequentially support the substrate  30  in the transfer direction. 
     The light source  291  faces the substrate  30 , and is arranged so as to face the substrate  30 . 
     The light source  291  includes a plurality of unit light sources  296  which is arranged in parallel in the transfer direction (X-axis direction) of the substrate  30 . 
     For example, the light source  291  is obtained by using a small-sized ultraviolet lamp as the unit light source  296  and arranging a plurality of small-sized ultraviolet lamps in parallel. 
     As shown in  FIG. 44 , each of the unit light sources  296  moves at an arbitrary inclined angle with respect to the X-axis direction, and the substrate  30  is irradiated with the parallel light F at an arbitrary inclined angle with respect to the transfer direction (X-axis direction). 
     The first roller  282  is arranged on the one surface  30   a  of the substrate  30  and supports the substrate  30  on the supply side of the substrate  30 . 
     The second roller  293  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the first roller  292 , is arranged on the one surface  30   a  of the substrate  30 , and supports the substrate  30 . The second roller  293  is arranged near one end (end on the supply side of the substrate  30 ) of the region (exposure region) α 191  where the negative photosensitive resin layer  33  can be exposed by the light source  291 . 
     The third roller  294  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the second roller  293  and the fourth roller  295 , is arranged on the one surface  30   a  of the substrate  30 , and supports the substrate  30 . The third roller  294  is arranged near the other end (end on the winding side of the substrate  30 ) of the exposure region α 191  of the substrate  30 . 
     The fourth roller  295  is arranged in the transfer direction of the substrate  30  with a prescribed distance from the third roller  294 , and is arranged on the one surface  30   a  of the substrate  30  and supports the substrate  30  on the winding side of the substrate  30 . 
     The exposure region α 191  is formed between the second roller  293  and the third roller  294 . 
     In the process of exposing the negative photosensitive resin layer  33 , the plurality of unit light sources  296  constituting the light source  291  moves in the X-axis direction of the substrate  30  at an arbitrary inclined angle, and thus, the parallel light F is applied at an arbitrary inclined angle with respect to the X-axis direction of the substrate  30 . Accordingly, the parallel light F can be applied from the other surface  30   b  in a state in which the substrate  30  has the inclined angle with respect to the normal direction. All the plurality of unit light sources  296  may simultaneously move in the same direction, or may randomly move in different directions. 
     According to the present embodiment, the parallel light F can be applied between the second roller  293  and the third roller  294  at the inclined angle (so as to be inclined) with respect to the normal direction of the substrate  30 . Accordingly, it is possible to expose the negative photosensitive resin layer  33  at the inclined angle in two or more different directions with respect to the normal direction of the substrate  30 . 
     According to the present embodiment, the light-diffusing member  35  on which the same light-diffusing section  34  of which the taper-shaped side surfaces are inclined in two or more different directions is formed is obtained. 
     Display Device 
       FIG. 45  is a longitudinal sectional view showing an embodiment of a liquid crystal display device as an example of a display device. 
     A liquid crystal display device  300  of the present embodiment schematically includes a liquid crystal display member  306  which includes a backlight  301  (light source), a first polarizing plate  302 , a liquid crystal panel  303  and a second polarizing plate  304 , and a light-diffusing member  307 . 
     One plate-shaped liquid crystal panel  303  is schematically illustrated in  FIG. 45 , and the structure thereof will be described in detail below. An observer sees the display from the top of the liquid crystal display device  300  in  FIG. 45  in which the light-diffusing member  307  is arranged. Thus, in the following description, a side on which the light-diffusing member  307  is referred to as a visual-perception side, and a side on which the backlight  301  is arranged is referred to as a rear side. 
     In the liquid crystal display device  300 , the light emitted from the backlight  301  is modulated in the liquid crystal panel  303 , and a prescribed image or character is displayed by the modulated light. If the light emitted from the liquid crystal panel  303  passes through the light-diffusing member  307 , an angle distribution of the emitted light becomes wider than that in a case where the light is incident on the light-diffusing member  307 , and thus, the light is emitted from the light-diffusing member  307 . 
     Accordingly, the observer can visually perceive the display with a wide viewing angle. 
     In the liquid crystal display device  300  of the present embodiment, the member manufactured by the method for manufacturing the light-diffusing member of the first to twenty-first embodiments is used as the light-diffusing member  307 . 
     The light-diffusing member  307  schematically includes a substrate  310  having light transparency, a plurality of light shielding layers  311  formed on one surface  310   a  of the substrate  310 , and a light-diffusing section  312  formed in a region other than a region of the one surface  310   a  of the substrate  310  where the light shielding layers  311  are formed. 
     The light-diffusing section  312  includes a light emission end surface  312   a  on the substrate  310 , and a light incident end surface  312   b  having an area greater than an area of the light emission end surface  312   a  opposite to the substrate  310 . 
     Hereinafter, the specific configuration of the liquid crystal panel  303  will be described. 
     Although it will be described in this example that an active matrix transmissive liquid crystal panel is used as the liquid crystal panel  303 , a liquid crystal panel capable of being applied to the present invention is not limited to the active matrix transmissive liquid crystal panel. For example, the liquid crystal panel capable of being applied to the present invention may be a translucent (transmissive and reflective) liquid crystal panel or a reflective liquid crystal panel, or may be a simple matrix liquid crystal panel in which each pixel does not include a switching thin film transistor (hereinafter, referred to as a “TFT”). 
       FIG. 46  is a longitudinal section view of the liquid crystal panel  303 . 
     As shown in  FIG. 46 , the liquid crystal panel  303  includes a TFT substrate  320  as a switching element substrate, a color filter substrate  321  disposed so as to face the TFT substrate  320 , and a liquid crystal layer  322  interposed between the TFT substrate  320  and the color filter substrate  321 . The liquid crystal layer  322  is sealed within a space surrounded by the TFT substrate  320 , the color filter substrate  321 , and a frame-shaped sealing member (not shown) which bonds the TFT substrate  320  to the color filter substrate  321  with a prescribed distance. The liquid crystal panel  303  is configured to display in, for example, a vertical alignment (VA) mode, and a vertical alignment liquid crystal having negative dielectric anisotropy is used as the liquid crystal layer  322 . Spherical spacers  323  for constantly maintaining the distance between these substrates are arranged between the TFT substrate  320  and the color filter substrate  321 . The display mode is not limited to the VA mode, but may include a twisted nematic (TN) mode, a super twisted nematic (STN) mode, and an In-Plane switching (IPS) mode. 
     On the TFT substrate  320 , a plurality of pixels (not shown) which are display minimum units is arranged in a matrix shape. On the TFT substrate  320 , a plurality of source bus lines (not shown) is formed so as to extend in parallel with one another, and a plurality of gate bus lines (not shown) is formed so as to extend in parallel with one another and so as to be perpendicular to the plurality of source bus lines. Accordingly, on the TFT substrate  320 , the plurality of source bus lines and the plurality of gate bus lines are formed in a grid pattern, and a rectangular region partitioned by the adjacent source bus line and the adjacent gate bus line serves as one pixel. The source bus line is connected to a TFT source electrode to be described below, and the gate bust line is connected to a TFT gate electrode. 
     On a surface of a transparent substrate  324  of the TFT substrate  320  close to the liquid crystal layer  322 , a TFT  329  which includes a semiconductor layer  325 , a gate electrode  326 , a source electrode  327 , and a drain electrode  328  is formed. For example, a glass substrate may be used as the transparent substrate  324 . For example, a semiconductor layer  325  made of a semiconductor layer such as continuous grain silicon (CGS), low-temperature poly-silicon (LPS) or amorphous silicon (α-Si) is formed on the transparent substrate  324 . A gate insulating film  330  is formed on the transparent substrate  324  so as to cover the semiconductor layer  325 . For example, a silicon oxide film, a silicon nitride film, or a laminated film thereof is used as the material of the gate insulating film  330 . 
     A gate electrode  326  is formed on the gate insulating film  330  so as to face the semiconductor layer  325 . For example, a laminated film of W (tungsten)/TaN (tantalum nitride), Mo (molybdenum), Ti (titanium) or Al (aluminum) is used as the material of the gate electrode  326 . 
     A first interlayer insulating film  331  is formed on the gate insulating film  330  so as to cover the gate electrode  326 . 
     For example, a silicon oxide film, a silicon nitride film, or a laminated film thereof is used as the material of the first interlayer insulating film  331 . 
     Source electrodes  327  and drain electrodes  328  are formed on the first interlayer insulating film  331 . The source electrode  327  is connected to a source region of the semiconductor layer  325  through a contact hole  332  penetrating the first interlayer insulating film  331  and the gate insulating film  330 . Similarly, the drain electrode  328  is connected to a drain region of the semiconductor layer  325  through a contact hole  333  penetrating the first interlayer insulating film  331  and the gate insulating film  330 . 
     The same conductive material as that of the above-described gate electrode  326  is used as the material of the source electrode  327  and the drain electrode  328 . 
     A second interlayer insulating film  334  is formed on the first interlayer insulating film  331  so as to cover the source electrodes  327  and the drain electrodes  328 . 
     The same material as that of the above-described first interlayer insulating film  331  or an organic insulating material is used as the material of the second interlayer insulating film  334 . 
     Pixel electrodes  335  are formed on the second interlayer insulating film  334 . The pixel electrode  335  is connected to the drain electrode  328  through the contact hole  336  penetrating the second interlayer insulating film  334 . Thus, the pixel electrode  335  is connected to the drain region of the semiconductor layer  325  by using the drain electrode  328  as an intermediate electrode. 
     For example, a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO) is used as the material of the pixel electrode  335 . 
     In such a configuration, in a case where a scanning signal is supplied through the gate bus line and the TFT  329  is turned on, a signal supplied to the source electrode  327  via the source bus line is supplied to the pixel electrode  335  via the semiconductor layer  325  and the drain electrode  328 . An alignment film  337  is formed on the entire surface of the second interlayer insulating film  334  so as to cover the pixel electrodes  335 . The alignment film  337  has an alignment restricting capability of vertically aligning liquid crystal molecules of the liquid crystal layer  322 . As the type of TFT, a top-gate type TFT shown in  FIG. 2  may be used, or a bottom-gate type TFT may be used. 
     Meanwhile, a black matrix  340 , color filters  341 , a planarization layer  342 , a facing electrode  343 , and an alignment film  344  are sequentially formed on a surface of a transparent substrate  339  of the color filter substrate  321  close to the liquid crystal layer  322 . 
     The black matrix  340  has a function of shielding light transmission in an inter-pixel region, and is formed using a photoresist obtained by dispersing metal such as a multilayer film of Cr (chrome) or Cr/chromium oxide, or carbon particles in photosensitive resin. 
     Each component of the colors such as red (R), green (G) and blue (B) are included in the color filter  341 , any one color filter  341  of R, G and B is arranged on one pixel electrode  335  on the TFT substrate  320  so as to face each other. 
     The planarization layer  342  is formed as an insulating film that covers the black matrix  340  and the color filters  341 , and has a function of achieving planarization by removing stepped portions caused by the black matrix  340  and the color filters  341 . 
     The facing electrode  343  is formed on the planarization layer  342 . The same transparent conductive material as that of the pixel electrode  335  is used as the material of the facing electrode  343 . 
     The alignment film  344  having the vertical alignment restricting capability is formed on the entire surface on the facing electrode  343 . 
     The color filters  341  may be implemented as three or more of multiple colors such as R, G and B. 
     As shown in  FIG. 1 , the backlight  301  includes a light source  350  such as a light-emitting diode or a cold-cathode tube, and a light guide plate  351  which emits light emitted from the light source  350  toward the liquid crystal panel  303  by using the internal reflection of the light. The backlight  301  may be an edge-lit type in which a light source is arranged on an end surface of a light guide, or may be a direct type in which a light source is arranged immediately below the liquid crystal panel  303 . The first polarizing plate  302  serving as a polarizer is provided between the backlight  301  and the liquid crystal panel  303 . The second polarizing plate  304  serving as an analyzer is provided between the liquid crystal panel  303  and the light-diffusing member  307 . 
     INDUSTRIAL APPLICABILITY 
     The present invention is applicable to various display devices such as a liquid crystal display device, an organic electroluminescence display device, and a plasma display. 
     REFERENCE SIGNS LIST 
     
         
         
           
               1  Manufacturing apparatus 
               11  Supply roller 
               12  Winding roller 
               13  Printing device 
               14  Barcode device 
               15  First drying device 
               16  Negative photosensitive resin layer forming device 
               17  Development device 
               18  Second drying device 
               19  Exposing device 
               20  Light source 
               30  Substrate 
               31  Light shielding layer 
               32  Negative photosensitive resin 
               33  Coating film (negative photosensitive resin layer) 
               34  Light-diffusing section 
               35  Light-diffusing member 
               41  First roller 
               42  Second roller 
               43  Third roller 
               44  Fourth roller 
               45  Fifth roller 
               300  Liquid crystal display device 
               301  Backlight (light source) 
               302  First polarizing plate 
               303  Liquid crystal panel 
               304  Second polarizing plate 
               306  Liquid crystal display member 
               307  Light-diffusing member 
               310  Substrate 
               311  Light shielding layer 
               312  Light-diffusing section 
               320  TFT substrate 
               321  Color filter substrate 
               322  Liquid crystal layer 
               323  Spacer 
               324  Transparent substrate 
               325  Semiconductor layer 
               326  Gate electrode 
               327  Source electrode 
               328  Drain electrode 
               329  TFT 
               330  Gate insulating film 
               331  First interlayer insulating film 
               332 ,  333  Contact hole 
               334  Second interlayer insulating film 
               335  Pixel electrode 
               337  Alignment film 
               339  Transparent substrate 
               340  Black matrix 
               341  Color filter 
               342  Polarization layer 
               343  Facing electrode 
               344  Alignment film 
               350  Light source 
               351  Light guide plate