Abstract:
A reflection screen apparatus in which a projection apparatus projects an image based on received image data and an observer observes the image comprises a screen reflection surface which visibly diffuses and reflects the image projected by the projection apparatus to the observer. The reflection screen apparatus further has a light distribution correction section configured to change a state of a distribution direction of a light reflected on the screen reflection surface so as to increase a diffused light reflected on the screen reflection surface to the observer.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
   This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2003-92072, filed Mar. 28, 2003, the entire contents of which are incorporated herein by reference. 
   BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to a reflection screen apparatus which reflects an image projected by a projection apparatus based on optimal light distribution, and to a projection system using the same. 
   2. Description of the Related Art 
   A projector of a so-called front projection type uses a reflection screen that reflects a projected image thereof. Various ideas have been tried for the screen so that a brighter light can be obtained for an observer by converging luminous flux reflected by the screen to the observer and reducing useless light reflected to the outside of the observer&#39;s visual field as much as possible. Accordingly, many inventions or commercial products have been presented regarding a reflection screen of high directivity in which the reflected light distribution angle of a screen reflection surface is narrowed. As opposed to a conventional white matte screen of a wide light distribution angle, a silver screen, a pearl screen, a bead screen, a hologram screen, etc., can be cited as such representative screens that have been in practical use. Further, various ideas have been presented to increase directivity by a structure such as a shape of a screen reflection surface, e.g., in Jpn. Pat. Appln. KOKAI Publications Nos. 6-242511, 5-45733, 2000-275755, 10-26802, etc. Thus, since the amount of a light can be increased for the observer in a condensed manner by the screen of a small light distribution angle, a demand therefor tends to increase more and more. 
   Recently, however, widespread use of projectors has increased the need for projection on a large screen even at a place of limited space, consequently increasing short-focus projectors. Thus, an incident angle of a projected luminous flux made incident on a screen end surface inevitably becomes steep on a general plane screen, creating a situation in which a direction itself of the reflected light distribution thereof is shifted more to an area outside the observer. A problem of the impossibility of achieving an original object occurs even on the screen reflection surface of a small light distribution angle. 
   Thus, Jpn. Pat. Appln. KOKAI Publication No. 5-297466 presents a screen apparatus that has a mechanism for changing light distribution angle characteristics by bending and deforming the entire screen reflection surface to a predetermined curved surface shape. This screen apparatus sets a plane state when observation is carried out at a wide light distribution angle by many people, and changes its state to a curved surface shape when observation is carried out by a small number of people. Additionally, a surface inspection apparatus or the like based on an image obtained by simply making variable a curvature of a curved surface shape of a screen reflection surface and concentrating a reflected light on a predetermined object is presented in Jpn. Pat. Appln. KOKAI Publication No. 8-114430. According to this method, it is possible to effectively provide bright images to an observer by making effective use of screen reflection characteristics of a small light distribution angle. 
   BRIEF SUMMARY OF THE INVENTION 
   According to a first aspect of the present invention, there is provided a reflection screen apparatus in which a projection apparatus projects an image based on received image data and an observer observes the image, comprising:
         a screen reflection surface which visibly diffuses and reflects the image projected by the projection apparatus to the observer; and   a light distribution correction section configured to change a state of a distribution direction of a light reflected on the screen reflection surface so as to more reflect a diffused light reflected on the screen reflection surface to the observer.       

   According to a second aspect of the present invention, there is provided a projection system comprising: 
   a projection apparatus which projects an image based on received image data; 
   a reflection screen apparatus in which an observer observes the image, the reflection screen apparatus including:
         a screen reflection surface which visibly diffuses and reflects the image projected by the projection apparatus to the observer; and   a light distribution correction section configured to change a state of a distribution direction of a light reflected on the screen reflection surface so as to more reflect a diffused light reflected on the screen reflection surface to the observer, the light distribution correction section changing the state of the light distribution direction and outputting image correction information in accordance with an amount of the change; and       

   an image correction section configured to execute image correction for the image data sent to the projection apparatus based on the image correction information from the light distribution correction section. 
   According to a third aspect of the present invention, there is provided a reflection screen apparatus in which a projection apparatus projects an image based on received image data and an observer observes the image, comprising: 
   a screen reflection surface which visibly diffuses and reflects the image projected by the projection apparatus to the observer; and 
   light distribution correction means for changing a state of a distribution direction of a light reflected on the screen reflection surface so as to more reflect a diffused light reflected on the screen reflection surface to the observer. 
   According to a fourth aspect of the present invention, there is provided a projection system comprising: 
   a projection apparatus which projects an image based on received image data; 
   a reflection screen apparatus in which an observer observes the image, the reflection screen apparatus including:
         a screen reflection surface which visibly diffuses and reflects the image projected by the projection apparatus to the observer; and   light distribution correction means for changing a state of a distribution direction of a light reflected on the screen reflection surface so as to more reflect a diffused light reflected on the screen reflection surface to the observer, the light distribution correction means changing the state of the light distribution direction and outputting image correction information in accordance with an amount of the change; and       

   image correction means for executing image correction for the image data sent to the projection apparatus based on the image correction information from the light distribution correction means. 
   Advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out hereinafter. 

   
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING 
     The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention, and together with the general description given above and the detailed description of the embodiments given below, serve to explain the principles of the invention. 
       FIG. 1  is a view showing a state of using a reflection screen apparatus according to a first embodiment of the present invention, and a projection system that uses the same; 
       FIG. 2  is a functional block diagram showing a basic configuration of the projection system according to the first embodiment; 
       FIG. 3  is a view showing a constitution of a screen according to a second embodiment of the present invention; 
       FIG. 4  is a functional block diagram showing a constitution for detecting a projected luminous flux incident angle; 
       FIG. 5  is a view showing a constitution of a screen according to a third embodiment of the present invention; 
       FIG. 6  is a view showing a relation between an amount of a detected light and a deformation angle of a screen reflection surface; 
       FIG. 7  is a view explaining each parameter in an estimation equation for calculating an amount of deformation control at a screen reflection surface deformation control section according to a fourth embodiment of the present invention; 
       FIG. 8  is a perspective view showing a deformation mechanism of a screen reflection surface deformation driving section according to a fifth embodiment of the present invention; 
       FIG. 9  is a block constitutional diagram of the screen reflection surface deformation driving section; 
       FIG. 10  is a view showing a constitution in the case of ceiling suspension; 
       FIG. 11  is a view showing a state of using a remote controller with a built-in photodetection sensor for explaining position measurement of an observer who uses the remote controller with the built-in photodetection sensor according to a sixth embodiment of the present invention; 
       FIG. 12  is a functional block diagram showing a configuration of a projection system that uses the remote controller with the built-in photodetection sensor; 
       FIG. 13  is a view showing a state of using a remote controller with a built-in marker for explaining setting of an observer covering area which uses the remote controller with the built-in marker according to a seventh embodiment of the present invention; 
       FIG. 14  is a view explaining a relation between a position of the remote controller with the built-in marker and the observer covering area; 
       FIG. 15A  is a view showing a state before deformation for explaining a positional relation between a micro-convex lens for light condensation and a light amount detection sensor according to an eight embodiment of the present invention; 
       FIG. 15B  is a view showing a state after deformation; 
       FIG. 16A  is a view showing a state before deformation for explaining a constitution of a screen reflection surface according to a ninth embodiment of the present invention; 
       FIG. 16B  is a view showing a state after deformation; 
       FIG. 17  is a view showing a constitution of a micro-lens; 
       FIG. 18  is a view explaining characteristics of a light absorption area; 
       FIG. 19  is a view showing a constitution of a screen reflection surface in the case of using a hologram filter; 
       FIG. 20  is a view explaining a deformation direction of a screen reflection surface according to a tenth embodiment of the present invention; 
       FIG. 21  is a view explaining a constitution of a screen reflection surface according to an eleventh embodiment of the present invention; 
       FIG. 22  is an expanded view (equivalent view) of an A portion of  FIG. 21  in the case of a charged film/thin plate system; 
       FIG. 23  is an expanded view (equivalent view) of the A portion of  FIG. 21  in the case of a charged rotary plate system; 
       FIG. 24  is a view showing a modified example of a constitution of  FIG. 22  in the case of using a photoelectric conversion section and an electricity accumulation section; 
       FIG. 25  is a view showing a modified example of a constitution of  FIG. 23  in the case of using the photoelectric conversion section and the electricity accumulation section; and 
       FIG. 26  is a view explaining a constitution of a screen according to a twelfth embodiment of the present invention. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   Next, the preferred embodiments of the present invention will be described with reference to the accompanying drawings. 
   First Embodiment 
   As shown on the left side of  FIG. 1 , a reflection screen apparatus according to a first embodiment of the present invention has a screen  10 . When an image is projected onto the screen  10  by a projection apparatus  12 , a projected luminous flux is made incident on a planar screen reflection surface of the screen  10 , and reflected as a reflected luminous flux in accordance with a reflected light distribution angle that the screen reflection surface has. Incidentally, in the specification, “light distribution angle” means a diffusing and spreading angle thereof when light rays made incident on the screen are reflected from the same spot of the screen reflection surface. The reflected luminous flux from the screen reflection surface only needs to enter eyes of all observers  14 , i.e., an observation area  16  that includes positions of the eyes of all the observers  14 . Reflected luminous fluxes on other areas, e.g., a ceiling, a desk, etc., are wasted. Thus, according to the reflection screen apparatus of the embodiment, the screen reflection surface is deformed as shown on the right side of  FIG. 1  to condense the reflected luminous flux in the observation area  16 , whereby bright images can be effectively provided to the observers  14 . As for the deformation, according to the embodiment, the observation area  16  is detected or set to adaptively deform the screen reflection surface, and luminous fluxes reflected on the screen reflection surface are efficiently condensed on the observers  14 . 
   As shown in  FIG. 2 , a projection system according to the embodiment comprises the reflection screen apparatus  18  of the embodiment, the projection apparatus  12 , and an image correction section  20 . The reflection screen apparatus  18  comprises a light distribution correction command section  22 , a projected luminous flux incident angle detection section  24 , an observer covering area setting section  26 , a screen light distribution angle memory section  28 , and a light distribution correction section  30 . The light distribution correction section  30  includes a screen reflection surface deformation control section  32 , and a screen reflection surface deformation driving section  34 . 
   Here, the light distribution correction command section  22  of the reflection screen apparatus  18  instructs projection-on to the projection apparatus  12  in accordance with an operation of an operation button (not shown) that the reflection screen apparatus  18  has by an operator (one of the observers  14 ). In association, a light distribution correction command is output to the projected luminous flux incident angle detection section  24  and the screen reflection surface deformation control section  32 . The projected luminous flux incident angle detection section  24  detects an angle of a luminous flux made incident from the projection apparatus  12  on the screen reflection surface  36  of the screen  10  in accordance with the light distribution correction command. By the operation of the operator of the operation button (not shown) that the reflection screen apparatus  18  has, the observer covering area setting section  26  sets an observer covering area that is information of a position in which the plurality of observers  14  including the operator who has executed the operation. Additionally, the screen light distribution angle memory section  28  stores data of a light distribution angle that the screen reflection surface  36  has as reflection characteristics. The screen reflection surface deformation control section  32  controls deformation of the screen reflection surface  36  in accordance with the light distribution correction command from the light distribution correction command section  22 . The screen reflection surface deformation driving section  34  drives deformation of the screen reflection surface  36  based on the control of the screen reflection surface deformation control section  32 . 
   Incidentally, in the above constitution, not all of the projected luminous flux incident angle detection section  24 , the observer covering area setting section  26 , and the screen light distribution angle memory section  28  are necessary. As in the case of each embodiment described below, these sections may be used as occasion demands. 
   According to the reflection screen apparatus  18  of the foregoing constitution, the screen reflection surface deformation control section  32  calculates an amount of deformation to provide an optimal light distribution to the observer covering area based on at least one of the incident angle of the luminous flux on the screen reflection surface  36  which has been detected by the projected luminous flux incident angle detection section  24 , the data of the light distribution angle which the screen reflection surface  36  has as the reflection characteristics and which has been stored by the screen light distribution angle memory section  28 , and the setting of the observer covering area by the observer covering area setting section  26 . Then, a control amount thereof is provided to the screen reflection surface deformation driving section  34 . The screen reflection surface deformation driving section  34  deforms the screen reflection surface  36  based on the control amount. Accordingly, the reflected light is effectively supplied from the screen reflection surface  36  to the observer  14 . 
   Furthermore, according to the projection system of the present invention, the screen reflection surface deformation control section  32  obtains image correction information such as data to correct distortion or nonuniform luminance of the projected image which occurs in accordance with the deformation amount of the screen reflection surface  36 , and supplies the information to the image correction section  20 . The image correction section  20  executes correction to improve the projected image based on image data input for projection in accordance with the image correction information. Then, the corrected image data is input to the projection apparatus  12  to be projected to the deformed screen reflection surface  36 . Thus, even if the screen reflection surface  36  is deformed, the observer  14  can observe an image substantially similar to that in the case of no deformation. 
   Incidentally, the amount of correction executed in accordance with the deformation amount of the screen reflection surface  36  based on the image correction information is obtained beforehand to be represented in a function or a table. Further, the deformation of the screen reflection surface  36  may be accompanied by a necessity of defocusing correction in addition to the correction of the distortion or the nonuniform luminance. Thus, as a function of the image correction section  20 , for example, an automatic lens replacement function or the like may be constituted to execute not only image data correction but also optical defocusing correction. 
   Therefore, the deformation of the screen reflection surface  36  enables the observer  14  to observe an image substantially similar to that in the case of no deformation but increased in amount. 
   Needless to say, the image correction section  20  may be incorporated in one of the reflection screen apparatus  18  and the projection apparatus  12 . 
   Second Embodiment 
   Next, as a second embodiment of the present invention, description will be made of deformation of the screen reflection surface  36  executed in accordance with incident angle detection of a luminous flux by the projected luminous flux incident angle detection section  24 . 
   That is, as shown in  FIG. 3 , a plurality of sets (N) of micro-convex lenses  38  for light condensation and corresponding light spot position detection sensors  40  are attached to predetermined positions, e.g., inconspicuous positions near an upper end and a lower end, of the screen  10 . According to this constitution, a condensing position y of a projected light  42  of the projection apparatus  12  on the light spot position detection sensor  40  by the micro-convex lens  38  for light condensation is changed in accordance with the angle of the projected light  42  made incident from the projection apparatus  12  on the screen reflection surface  36 . Thus, it is possible to find out the incident angle of the projected light  42  with respect to the position of the screen reflection surface  36  based on a detection value of the light spot position detection sensor  40 . 
   Incidentally, in  FIG. 3 , a reference numeral  44  denotes a main reflection optical axis before deformation of the screen reflection surface  36 , and a reference numeral  46  denotes a main reflection optical axis after deformation. 
   Further, as shown in  FIG. 4 , the projected luminous flux incident angle detection section  24  comprises a projected luminous flux angle calculation section  48  in addition to the light spot position detection sensors  40  (and the micro-convex lenses  38  for light condensation). The screen reflection surface deformation control section  32  comprises a screen deformation amount calculation section  50  and a screen reflection surface operation section  52 . The projected luminous flux angle calculation section  48  calculates the angle of luminous flux of the projected light  42  made incident on the screen reflection surface  36  based on a detection value y from each light spot position detection sensor  40 . Then, the calculated data is output to the screen deformation amount calculation section  50  of the screen reflection surface deformation control section  32 . The screen deformation amount calculation section  50  calculates an optimal deformation amount θ of the screen reflection surface  36  based on the calculated data, light distribution angle information from the screen light distribution angle memory section  28 , and observer covering area information from the observer covering area setting section  26 . Then, the calculated optimal deformation amount is input to the screen reflection surface deformation operation section  52 . The screen reflection surface deformation operation section  52  obtains an operation amount to deform the screen  10  in accordance with the input optimal deformation amount, and outputs the operation amount to the screen reflection surface deformation driving section  34 . 
   Thus, according to the embodiment, it is possible to easily detect the angle of the projected luminous flux made incident on the screen reflection surface  36  by detecting the light spot position thereon. 
   Additionally, a light distribution range of the luminous flux reflected on the screen reflection surface  36  is obtained based on the angle of the projected luminous flux made incident thereon, and the screen reflection surface  36  can be properly deformed to match the range with the area that covers the observers  14 . Thus, it is possible to effectively condense the reflected luminous flux of the screen reflection surface  36  on the observers  14 . 
   Incidentally, as shown in  FIG. 4 , the reflection screen apparatus  18  of the embodiment may further comprise a deformation amount display section  54 , a deformation pattern memory section  56 , and a deformation pattern selection section  58 . That is, the optimal deformation amount θ of the screen reflection surface obtained by the screen deformation amount calculation section  50  is also output to the deformation amount display section  54 . Then, the deformation amount display section  54  displays the input optimal deformation amount. Accordingly, the observers  14  can perceive the deformation amount. The deformation pattern memory section  56  prestores typical deformation patterns of the screen reflection surface  36 . One of the observers  14  selects a pattern by switch selection or the like at the deformation pattern selection section  58 . Upon selection of the deformation pattern, the deformation pattern information is supplied from the deformation pattern selection section  58  to the screen reflection surface deformation operation section  52 . The screen reflection surface deformation operation section  52  obtains an operation amount corresponding to the deformation pattern information, and sends the operation amount to the screen reflection surface deformation driving section  34 . Further, the observer  14  may optionally select an easily seen deformation pattern. 
   Third Embodiment 
   As in the case of the second embodiment, a third embodiment concerns deformation of the screen reflection surface  36  executed in accordance with the incident angle detection of the luminous flux by the projected luminous flux incident angle detection section  24 . 
   As shown in  FIG. 5 , according to the embodiment, a light amount detection sensor  60  is used in place of the light spot position detection sensor  40  of the second embodiment. Additionally, according to the embodiment, the projected luminous flux angle calculation section  48  of the projected luminous flux incident angle detection section  24  stores the relation between the detected light amount of the light amount detection sensor  60  and the incident angle of the projected luminous flux as foresighted information. Accordingly, the projected luminous flux angle calculation section  48  can easily find out the incident angle of the projected luminous flux based on the detected light amount of the light amount detection sensor  60 . As a result, as in the case of the second embodiment, the angle of the projected luminous flux made incident on the screen reflection surface  36  can be calculated to be output to the screen deformation amount calculation section  50  of the screen reflection surface deformation control section  32 . 
   Thus, according to the embodiment, it is possible to easily detect the angle of the projected luminous flux made incident on the screen reflection surface  36 . Moreover, a light distribution range of the reflected luminous flux on the screen reflection surface  36  is obtained based on the incident angle of the projected luminous flux thereon, and the screen reflection surface  36  can be properly deformed to match the range with the area that covers the observers  14 . As a result, it is possible to effectively condense the reflected luminous flux of the screen reflection surface  36  on the observers  14 . 
   Incidentally, in place of the processing through the projected luminous flux angle calculation section  48 , the detected light amount of the light amount detection sensor  60  may be directly supplied to the screen deformation amount calculation section  50  of the screen reflection surface deformation control section  32 . In this case, the screen deformation amount calculation section  50  stores the relation between the detected light amount and the deformation angle φ of the screen reflection surface  36  which is similar to that shown in  FIG. 6  as foresighted information, and φ=φx is preset as an optimal deformation angle of the screen reflection surface  36 . Thus, the screen deformation amount calculation section  50  can calculate an optimal deformation amount of the screen reflection surface  36  based on a difference between the deformation angle corresponding to the detected light amount detected by the projected luminous flux incident angle detection section  24  and the optimal deformation angle φx. 
   Fourth Embodiment 
   A fourth embodiment concerns deformation control amount calculation of the screen reflection surface  36  by the screen reflection surface deformation control section  32 . 
   An estimation equation for deformation control amount calculation at the screen reflection surface deformation control section  32  will be described by referring to  FIG. 7 . This estimation equation is a setting example at a screen position P. In the drawing, the reference numeral  62  denotes a vertical reference line at the screen position P, and the reference numeral  64  denotes a horizontal reference line at the same. 
   Now, it is assumed that apexes of a virtual space which defines an observer covering area  66  set by the observer covering area setting section  26  are A, B, C and D. Additionally, it is assumed that an incident angle (angle formed with a normal direction of the screen reflection surface  36 ) of the projected light  42  detected by the projected luminous flux incident angle detection section  24  is α, a half of a maximum screen light distribution angle (defined by a kind of the screen  10 , and stored in the screen light distribution angle memory section  28 ) is β, and an angle formed between a maximum light distribution boundary  68  (AP) and the horizontal reference line  64  is γA. Then, an angle φ of screen inclination (uppermost projected portion) that is a deformation control amount can be obtained by the following equation:
 
φ=α−β+γ A 
 
   Incidentally, the “light distribution angle” means the diffusing and spreading angle thereof when light rays made incident on the screen  10  are reflected from the same spot of the screen reflection surface  36 . The “maximum light distribution angle” means the angle formed between light rays of half-value brightness which sandwich a main reflection optical axis  46  of highest brightness among reflected lights from the same spot of the screen reflection surface  36 . The “maximum light distribution boundary” means the position of the light rays of the half-value brightness. Reference numeral  70  denotes the other maximum light distribution boundary. The “half-value brightness” is not necessarily a half value. The value may properly be defined based on a designing idea. 
   Furthermore, in addition to the aforementioned example, matching of the maximum light distribution boundary  68  with one of the apexes of the virtual space that defines the observer covering area based on a relation between a size of the light distribution angle and a size of the observer covering area  66  may be decided on a case-by-case basis. 
   Thus, it is possible to easily calculate a deformation control amount by using the estimation equation. 
   Fifth Embodiment 
   A fifth embodiment concerns deformation of the screen reflection surface  36  by the screen reflection surface deformation driving section  34 . 
   The screen  10  has spring characteristics, and is constituted to hold an erected spread state even if there is no special holding mechanism. Then, as shown in  FIG. 8 , deformation wires  72  are passed through wire guides  74  arranged along both left and right ends of the screen  10 . One end of each deformation wire  72  is fixed to an upper end position of the screen  10 , while the other end side is fixed to a winding bobbin  76  attached to a rotary shaft of a rotary motor  78 . The wire guide  74  allows free screen up-and-down movement of the deformation wire  72 , but regulates screen left-and-right, and forward movement thereof within a predetermined range. Thus, the rotary motor  78  is rotated to wind the deformation wire  72  on the winding bobbin  76 , whereby the screen upper end to which one end of the deformation wire  72  has been fixed is pulled downward to bend and deform the screen  10 . 
   Additionally, a photoelectric conversion section  80  is arranged near the lower end of the screen  10  to convert the projected light  42  into power. As shown in  FIG. 9 , the power obtained by the photoelectric conversion section  80  is stored in an electricity accumulation section  82  to be used as a power supply for each section of the reflection screen apparatus which includes the screen reflection surface deformation control section  32 . 
   Thus, according to the embodiment, the light projected to the screen reflection surface  36  is converted into power by the photoelectric conversion section  80 , and the power is used as a driving power supply for the mechanism of changing the light distribution direction state of the screen reflection surface  36 . Therefore, there is no need to prepare another power supply for the mechanism of changing the light distribution direction state of the screen reflection surface  36 , which contributes to energy saving. 
   Incidentally, as shown in  FIG. 10 , it is needless to say that the constitution of  FIG. 8  can be set upside down to be used as a screen of a ceiling suspension type. 
   Furthermore, the screen deformation mechanism is not limited to the type that uses the deformation wires  72 . Needless to say, for example, the present invention can be applied to various deformation mechanisms such as deformation by an extrusion mechanism from the back of the screen reflection surface to the projection apparatus side. 
   Sixth Embodiment 
   A sixth embodiment is designed in such a manner that a light amount is detected at a position of the observer  14  to accordingly deform the screen reflection surface  36 . 
   That is, a photodetection sensor is incorporated in a remote controller that is a remote operation member of the reflection screen apparatus. Then, as shown in  FIG. 11 , an amount of a reflected light from the screen  10  is measured by the remote controller  84  with the built-in photodetection sensor. As a matter of course, the photodetection sensor should be set at a position in which the observer  14  can visually observe a projected image most brightly. Thus, as shown in  FIG. 11 , the observer  14  simply holds the remote controller  84  with the built-in photodetection sensor by hand to set a state at a visual position. 
   In the case of using such a remote controller  84  with the built-in photodetection sensor, a reflected light detection section  86  is disposed as a photodetection sensor in the light distribution correction section  30  as shown in  FIG. 12  in place of the projected luminous flux incident angle-detection section  24  in the basic constitution shown in  FIG. 2 . Then, the reflected light detection section  86  and the operation section that includes the light distribution correction command section  22  or the like are arranged in the remote controller  84  with the built-in photodetection sensor. In this case, incidentally, the reflected light detection section  86  is connected to the screen reflection surface deformation control section  32  by wireless or the like. 
   According to the described constitution, the observer  14  holds the remote controller  84  with the built-in photodetection sensor by hand to set the state at the visual position, and executes a predetermined key operation to issue a light distribution correction command from the light distribution correction command section  22 . An image white on the full surface or a certain static image is projected from the projection apparatus  12  in accordance with the light distribution correction command. In association, the amount of a reflected light of the projected image on the screen reflection surface  36  is detected by the reflected light detection section  86  of the remote controller  84  with the built-in photodetection sensor. Subsequently, the result of the detection is transmitted to the screen reflection surface deformation control section  32  by wireless or the like. Thus, each section after the screen reflection surface deformation-control section  32  executes the aforementioned operation to deform the screen reflection surface  36 . 
   Incidentally, if there are a plurality of observers  14 , preferably, photodetection sensors are set at positions of all the observers to carry out detection in a time division manner, and a deformation amount of the screen reflection surface  36  is decided so that all difference values among obtained light amount signals can become minimum. That is, in the case of one observer  14 , deformation control may be carried out so that the light amount detected by the photodetection sensor (reflected light detection section  86 ) can take a maximum value. On the other hand, in the case of the plurality of observers  14 , deformation control is carried out so that a difference between the detected light amounts can become minimum. This processing is for the purpose of preventing generation of a difference in brightness of the projected image among the target observers  14  as much as possible. 
   According to the sixth embodiment, it is possible to surely condense the reflected luminous flux of the screen reflection surface in the area that includes (the plurality of) the observers by holding the photodetection sensor at (each) the observer or the like to set the position of (each) the photodetection sensor substantially identical to that of (each) the observer. 
   Incidentally, according to the embodiment, the reflected light detection section  86  is incorporated in the remote controller  84  with the built-in photodetection sensor, and connected to the screen reflection surface deformation control section  32  by wireless or the like. Needless to say, however, the screen reflection surface deformation control section  32  may be incorporated in the remote controller  84  with the built-in photodetection sensor. In this case, the screen reflection surface deformation control section  32 , the screen reflection surface deformation driving section  34  and the image correction section  20  are interconnected by wireless or the like. 
   Seventh Embodiment 
   As opposed to the sixth embodiment, a seventh embodiment is designed in such a manner that a light is emitted from the position of the observer  14 , the light is received at the position of the screen reflection surface  36  to detect the position of the observer, and an observer covering area is accordingly set to deform the screen reflection surface  36 . 
   That is, as shown in  FIG. 13 , a marker light spot position detection sensor  88  detects a luminous flux  90  from a luminous body (not shown) as a marker that is incorporated in a remote controller  92  with a built-in marker. Then, the screen reflection surface deformation control section  32  obtains the position of an emission point thereof by calculation. The marker light spot position detection sensor  88  generally comprises an image-forming lens and a light spot position sensor (not shown). In this example, the marker light spot position detection sensor  88  is arranged on a fixed screen lower part or the like of no relation to deformation so as to facilitate detection. If two sets of marker light spot position sensors  88  of such a constitution are arranged at a predetermined interval as shown in  FIG. 14 , it is possible to specify a spatial position of a marker light spot by using a triangulation principle. Needless to say, the marker should be set at a position in which the observer can visually observe the projected image most brightly, and the observer simply holds the marker to set a state at the visual position. 
   Thus, the light emitted from the marker is received to obtain a coordinate position thereof relative to the screen reflection surface  36 , and the observer covering area  66  is set based on the obtained coordinate position. Therefore, it is possible to accurately set the observer covering area  66  in which the observer  14  is present. Additionally, in this case, a space that has a predetermined spatial spread including the detected marker coordinate may be set as an observer covering area. In this way, even if there are a plurality of observers around the marker position, the space that includes the plurality of observers can be set as an observer covering area. As a result, it is possible to surely condense the reflected luminous flux of the screen reflection surface on the plurality of observers. 
   Needless to say, if there are a plurality of observers, markers may be arranged at positions of all the observers in a time division manner to set the observer covering area  66 . Alternatively, as shown in  FIG. 14 , markers may be arranged at eight edge corners of a virtual space of the observer covering area  66  in a time division manner to set the same. Thus, it is possible to set the observer covering area  66  more accurately by setting the space surrounded with a plurality of marker coordinates as the observer covering area  66 . 
   It goes without saying that the marker is not limited to the type which uses a light, but may be a type which uses a generally used ultrasonic sound wave, electromagnetic wave or the like. 
   Eight Embodiment 
   According to the third embodiment, the light amount is detected on the screen reflection surface  36  to detect the incident angle of the projected luminous flux, and the deformation amount of the screen reflection surface  36  is accordingly decided. 
   On the other hand, according to the eighth embodiment, a light amount is detected while the screen reflection surface  36  is deformed, and a deformed state thereof is held when a predetermined light amount is obtained. That is, the micro-convex lens  38  for light condensation and the light amount detection sensor  60  are attached to the screen  10  in a relative positional relation in which a focusing point by the micro-convex lens  38  for light condensation is not matched with the light amount detection sensor  60  in a state before deformation as shown in  FIG. 15A , and matched therewith in a state after deformation as shown in  FIG. 15B . According to such a constitution, when the screen reflection surface  36  is gradually deformed, the focusing point by the projected light  42  from the projection apparatus  12  is gradually shifted. When the focusing point is matched with the light amount detection sensor  60  at a predetermined position, deformation of an angle φ has been achieved by this time in which a reflected light from the screen reflection surface  36  is directed to a predetermined observer covering area  66 . Thus, it is only necessary to hold this deformed state. 
   Ninth Embodiment 
   As shown in  FIG. 16A , there is known an apparatus in which the screen reflection surface  36  is constituted by two-dimensionally arranging a micro-lens  94 . Here, a reflection and diffusion area  96  surrounded with a light absorption area (black area)  98  is constituted on an image forming surface of the micro-lens  94 . On the screen reflection surface  36  of such a constitution, a light condensed in the reflection and diffusion area  96  by the micro-lens  94  is reflected and diffused therein to go out of the micro-lens  94 . On the other hand, a light condensed in the light absorption area  98  is absorbed therein. 
   If the screen reflection surface  36  is constituted by two-dimensionally arranging such a micro-lens  94 , when it is deformed as shown in  FIG. 16B , even the projected light  42  absorbed in the light absorption area  98  before deformation can be condensed in the reflection and diffusion area  96 . Thus, the light is reflected and diffused by the reflection and diffusion area  96  to go out of the micro-lens  94 , and to be observed by the observer  14 . Besides, there is no influence of an external light  100  from a ceiling illumination lamp or the like since it is absorbed in the light absorption area  98 . 
   In the micro-lens  94 , a wavelength selection reflection and diffusion film  102  shown in  FIG. 17  may be constituted in place of the reflection and diffusion area  96 . As shown in  FIG. 18 , the wavelength selection reflection and diffusion film  102  has characteristics of reflecting and diffusing only predetermined wavelengths, i.e., wavelengths R, G and B of the projected light  42 , but not other light of a non-reflection wavelength area  104 . Accordingly, even if the external light  100  from the illumination lamp of the like is condensed on a portion other than the light absorption area  98 , the light is not reflected/diffused, and thus a screen reflection surface  36  difficult to be influenced by the external light  100  can be formed. 
   In  FIG. 17 , reference numeral  106  denotes a projected luminous flux, and reference numeral  108  denotes a reflected and diffused luminous flux. 
   Additionally, in place of the micro-lens  94  equipped with the wavelength selection reflection and diffusion film  102 , as shown in  FIG. 19 , a hologram filter  110  may be used which comprises wavelength selection reflection and diffusion film  112  in which areas are arrayed to individually reflect and diffuse R, G and B. That is, as shown, the hologram filter  110  can spatially separate focusing points by wavelengths. Accordingly, if the wavelength selection reflection and diffusion film  112  in which the areas are arranged to reflect and diffuse the corresponding R, G and B wavelengths is constituted at a position of each focus, it is possible to obtain operational effects similar to those of the micro-lens  94  equipped with the wavelength selection reflection and diffusion film  102  shown in  FIG. 17 . 
   Tenth Embodiment 
   Thus far, description has been made of one-dimensional deformation which deforms the upper end side of the screen reflection surface  36  toward the observer as the deformation direction thereof. However, the present invention is not limited to such. Needless to say, two-dimensional deformation may be carried out as indicated by θx, θy of  FIG. 20 . 
   The two-dimensional deformation that bends the screen reflection surface  36  in a concave shape enables more effective condensation of the reflected luminous flux thereof on the observer  14 . 
   Eleventh Embodiment 
   Thus far, description has been made of deformation of the entire screen reflection surface  36 . However, the present invention is not limited to such. Needless to say, the screen reflection surface  36  may be locally deformed. 
   That is, as shown in  FIG. 21 , the screen reflection surface  36  is constituted by arranging a plurality of micro-diffusion and reflection surfaces  114  ( 114   1 ,  114   2 , . . . ,  114   N ) on a screen base  116 . The micro-diffusion and reflection surfaces  114  are movable. Thus, it is possible to change a state of a distribution direction of a light reflected on the screen reflection surface  36  by moving the micro-diffusion and reflection surfaces  114 . 
   According to such a constitution, finer control can be carried out by micro-diffusion and reflection surface units. Incidentally, in  FIG. 21 , a reference numeral  118  denotes a screen reflected light distribution angle. 
   Some constitutional examples for moving the micro-diffusion and reflection surfaces  114  will be described. 
   First, a charged film/thin film system will be described by referring to  FIG. 22 . The drawing is an expanded view (equivalent view) of an A portion of  FIG. 21 , showing only one micro-diffusion and reflection surface  114  (similar in  FIGS. 23 to 25 ). 
   That is, as shown in  FIG. 22 , two fixed electrodes  120  are attached to the screen base  116 . Further, one side face of a charged movable plate  122  one surface of which is charged “+” and the other surface of which is charged “−” is attached between the fixed electrodes  120 . Then, the micro-diffusion and reflection surface  114  is arranged on a free side face of the charged movable plate  122 . Additionally, one of the fixed electrodes  120  is connected through a switch  126  to a power source  124 , while the other is grounded. 
   According to such a constitution, the switch  126  is off in a state before deformation. At the time of transition to deformation, the switch  126  is turned on to apply “+” to the fixed electrode  120  opposite the “+” charged side of the charged movable plate  122 . Accordingly, the charged movable plate  122  is deformed by repulsion of charges, which is accompanied by a change in inclination angle of the micro-diffusion and reflection surface  114 . Then, when a desired angle is reached, the switch  126  is turned off to hold the deformed state. 
     FIG. 23  is a view showing a constitution in the case of a charged rotary plate system. In this case, a charged rotary plate  128  that has a surface to become the micro-diffusion and reflection surface  114  is rotatably attached in the screen base  116 . One side face of the charged rotary plate  128  is charged “+” while the other side face is charged “−”. Then, three fixed electrodes  120   1 , and three fixed electrodes  120   2  are disposed on the screen base  116  sandwiching the charged rotary plate  128 . In this case, the fixed electrode  120   2  that becomes an observer side is constituted as a transparent electrode. The three fixed electrodes  120   1  are selectively connected through a switch  126   1  to the power source  124 , while the three fixed electrodes  120   2  are selectively grounded through a switch  126   2 . The switches  126   1  and  126   2  are linked with each other. However, the fixed electrodes  120   1 ,  120   2  and the switches  126   1 ,  126   2  are connected so that uppermost one of the three fixed electrodes  120   1  and lowermost one of the three fixed electrodes  120   2  can be simultaneously selected, middle one of the fixed electrodes  120   1  and middle one of the fixed electrodes  120   2  can be simultaneously selected, and lowermost one of the fixed electrodes  120   1  and uppermost one of the fixed electrodes  120   2  can be simultaneously selected. 
   Thus, according to such a constitution, the switches  126   1 ,  126   2  are both off in a state before deformation. At the time of transition to deformation, the switch  126   1  is switched to set a state of connecting the lowermost fixed electrode  120   1  to the power source  124 , while the switch  126   2  is switched to set a state of grounding the uppermost fixed electrode  120   2 . Then, the “−” charged side face of the charged rotary plate  128  is pulled to the lowermost fixed electrode  120   1  side, while the “+” charged side face is pulled to the uppermost fixed electrode  120   2  side. Accordingly, the charged rotary plate  128  is rotated to change the inclination angle of the micro-diffusion and reflection surface  114 . Then, when a desired angle is reached, the switches  126   1 ,  126   2  are both turned off to hold the deformed state. 
   As a result, it is possible to hold the deformation of the micro-diffusion and reflection surface  114  by an electrostatic force. 
   Incidentally, the photoelectric conversion section  80  and the electricity accumulation section  82  described above with reference to the fifth embodiment may be used in place of the power source  124 . A constitution in such a case is shown in  FIGS. 24 and 25 . 
   Twelfth Embodiment 
   An embodiment is applied to a screen of a curtain type. 
   That is, as shown in  FIG. 26 , the screen  10  is formed in a dual structure of a curtain  130  and a screen reflection surface  36 . Then, the curtain  130  and the screen reflection surface  36  are folded together to be housed, and the screen reflection surface  36  is spread in a drawn state of the curtain  130 . 
   According to such a constitution, only the screen reflection surface  36  is deformed to enable effective condensation of a reflected luminous flux thereof on the observer  14 . 
   Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.