Abstract:
Practical for use to make a road divider/reflector or a solar collector, a light distribution panel is disclosed to include four faces that can be planar or arched faces and constitute a light distribution curve to control the moving direction of light. When used in a lamp, light is evenly distributed onto the expected illumination area, avoiding formation of Gauss distribution and providing broad area illumination. When used as a road reflector, the light distribution panel provides excellent driving safety effect. When used in a solar collector system, the light distribution panel collects a wide range of incident light.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to light distribution technology and more particularly, to a light distribution panel having light distribution curves formed of multiple faces and designed subject to the principles of optical refraction and reflection of critical angle of the medium. The light distribution panel is suitable for use in lamps, road lines and reflectors, and solar energy collection. When used for illumination, the light distribution panel minimizes brightness loss, provides even and soft luminance, saves energy, and avoids light pollution. When used in road line, the light distribution gives a prominent indication. When used in a solar collector system, the light distribution panel lowers the cost of the solar collector panel. 
         [0003]    2. Description of the Related Art 
         [0004]    Regular lamps include two types, one for indoor application and the other for outdoor application. A lamp for indoor application, as shown in  FIG. 1A , comprises a light source  102 , a hand style opaque lampshade  101  disposed around the light source  102  at the top side, and a reflector  103  provided inside the lampshade  101  for reflecting light from the light source  102  toward a predetermined illumination area. According to this design, some light rays from the light source  102  go directly to the expected illumination area, and the reflector  103  reflect the other light rays from the light source  102  toward the illumination area. To avoid glaring, the surface of the light source may be frosted. 
         [0005]    When the aforesaid lamp is used for outdoor application, as shown in  FIG. 1B , a light transmitting covering  104  may be covered on the bottom side of the lampshade  103 . To avoid glaring, the light transmitting covering  104  has tiny raised portions formed on the outer surface (to achieve the functioning of a frosted glass). However, the frosted treatment of the transmitting covering  104  or the surface of the light source  102  results in a brightness loss. Lamps of these kinds show a Gaussian distribution where the brightness is concentrated at a specific area right below the lamp. 
         [0006]      FIG. 2  is a schematic drawing showing a conventional street/park lamp. The street/park lamp comprises a lamp post  201  and a lamp  202  fixedly mounted in the top side of the lamp post  201 . The lamp  202  comprises a light source  203  upwardly disposed on the inside, and a light transmitting lampshade  204  covered over the light output side of the lamp  202 . The light transmitting lampshade  204  allows light rays to go in different directions, providing a poor road illumination effect and causing a severe light pollution. 
         [0007]      FIG. 3  is a schematic drawing showing another design of conventional street/park lamp. According to this design, the street/park lamp comprises a lamp post  301 , a lamp  302  fixedly mounted in the top side of the lamp post  301  and having a light source  303  upwardly disposed on the inside, and a reflector  304  obliquely disposed above the lamp  302  for reflecting light rays from the light source  303  toward the ground. This design of street/park lamp has the drawback of limited illumination range. 
         [0008]    Further, a reflector for road line generally comprises a metal frame embedded in the road, and a plastic plate member coated with a layer of a fluorescent substance and fixedly mounted in the metal frame. When light rays from the headlights of a running motor vehicle fall upon the fluorescent substance-coated plastic plate member of the reflector, the fluorescent substance-coated plastic plate member reflects the light rays, and therefore the driver can well see the direction of the road line. However, when the fluorescent substance-coated plastic plate member is covered with dust, the reflection performance of the fluorescent substance-coated plastic plate member will be lowered or even disappeared. 
       SUMMARY OF THE INVENTION 
       [0009]    The present invention has been accomplished under the circumstances in view. It is one object of the present invention to provide a light distribution panel having light distribution curves formed of multiple faces, which is practical for use in a lamp, reflector for road line or solar energy collector panel, eliminating the drawbacks of the prior art designs. When used in a lamp or reflector for road line, the light distribution panel controls the angle of refraction or reflection of the major part of incident light, enabling light be evenly projected onto a predetermined illumination area. 
         [0010]    The light distribution panel comprises at least four faces. A number of the faces constitute a light distribution curve that controls the path of the major part of the incident light. The faces can be a planar face or arched face. Further, the tilting angle, curvature and surface area of every face are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0011]    Further, the light distribution panel can be made in a rectangular, circular, oval, or irregular shape. Further, the light distribution panel can be prepared from light transmitting plastics, light transmitting glass, or any other light transmitting materials. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0012]      FIG. 1A  is a schematic drawing showing a lamp covered with a half style lampshade according to the prior art. 
           [0013]      FIG. 1B  is a schematic drawing showing a lamp covered with a full style lampshade according to the prior art. 
           [0014]      FIG. 2  is a schematic drawing showing a conventional street/park lamp. 
           [0015]      FIG. 3  is a schematic drawing showing another design of conventional street/park lamp. 
           [0016]      FIG. 4  illustrates light refraction through a light distribution panel in accordance with the present invention (I). 
           [0017]      FIG. 4A  illustrates light refraction through a light distribution panel in accordance with the present invention (II). 
           [0018]      FIG. 4B  illustrates light refraction through a light distribution panel in accordance with the present invention (III). 
           [0019]      FIGS. 5 and 5A  show the structure of a light distribution panel in accordance with a first embodiment of the present invention. 
           [0020]      FIG. 6  is a schematic drawing showing light path control of the light distribution panel in accordance with the 1 st  embodiment of the present invention. 
           [0021]      FIGS. 7 ,  7 A and  7 B show the structure of a light distribution panel in accordance with a 2 nd  embodiment of the present invention. 
           [0022]      FIG. 8  is a schematic drawing showing light path control of the light distribution panel in accordance with the 2 nd  embodiment of the present invention. 
           [0023]      FIGS. 9 and 9A  show the structure of a light distribution panel in accordance with a 3 rd  embodiment of the present invention. 
           [0024]      FIG. 10  is a schematic drawing showing light path control of the light distribution panel in accordance with the 3 rd  embodiment of the present invention. 
           [0025]      FIGS. 11 ,  11 A and  11 B show the structure of a light distribution panel in accordance with a 4 th  embodiment of the present invention. 
           [0026]      FIGS. 12 ,  12 A and  12 B show the structure of a light distribution panel in accordance with a 5 th  embodiment of the present invention. 
           [0027]      FIGS. 13 ,  13 A and  13 B show the structure of a light distribution panel in accordance with a 6 th  embodiment of the present invention. 
           [0028]      FIGS. 14 ,  14 A and  14 B show the structure of a light distribution panel in accordance with a 7 th  embodiment of the present invention. 
           [0029]      FIGS. 15 ,  15 A and  15 B show the structure of a light distribution panel in accordance with a 8 th  embodiment of the present invention. 
           [0030]      FIGS. 16 ,  16 A show the structure of a light distribution panel in accordance with a 9 th  embodiment of the present invention. 
           [0031]      FIGS. 17 ,  17 A show the structure of a light distribution panel in accordance with a 10 th  embodiment of the present invention. 
           [0032]      FIGS. 18 ,  18 A and  18 B show the structure of a light distribution panel in accordance with a 11 th  embodiment of the present invention. 
           [0033]      FIGS. 19 ,  19 A and  19 B show the structure of a light distribution panel in accordance with a 12 th  embodiment of the present invention. 
           [0034]      FIGS. 20 ,  20 A and  20 B show the structure of a light distribution panel in accordance with a 13 th  embodiment of the present invention. 
           [0035]      FIGS. 21 ,  21 A and  21 B show the structure of a light distribution panel in accordance with a 14 th  embodiment of the present invention. 
           [0036]      FIG. 22  is a schematic drawing showing an application example of the present invention in a lamp. 
           [0037]      FIG. 23  is a schematic drawing showing another application example of the present invention in a lamp. 
           [0038]      FIG. 24  is a schematic drawing showing still another application example of the present invention in a lamp. 
           [0039]      FIGS. 25 ,  25 A show the structure of a light distribution panel in accordance with a 15 th  embodiment of the present invention. 
           [0040]      FIGS. 26 ,  26 A show the structure of a light distribution panel in accordance with a 16 th  embodiment of the present invention. 
           [0041]      FIGS. 27 ,  27 A show the structure of a light distribution panel in accordance with a 17 th  embodiment of the present invention. 
           [0042]      FIGS. 28 ,  28 A and  28 B show the structure of a light distribution panel in accordance with a 18 th  embodiment of the present invention. 
           [0043]      FIGS. 29 ,  29 A and  29 B show the structure of a light distribution panel in accordance with a 19 th  embodiment of the present invention. 
           [0044]      FIGS. 30 ,  30 A and  30 B show the structure of a light distribution panel in accordance with a 20 th  embodiment of the present invention. 
           [0045]      FIG. 31  is a schematic drawing showing an application example of the present invention in a reflector for road line. 
           [0046]      FIGS. 32 and 32A  show an application example of the present invention in a solar collector system. 
           [0047]      FIGS. 33 ,  33 A show the structure of a light distribution panel in accordance with a 21 st  embodiment of the present invention. 
           [0048]      FIGS. 34 ,  34 A and  34 B show the structure of a light distribution panel in accordance with a 22 nd  embodiment of the present invention. 
           [0049]      FIGS. 35 ,  35 A and  35 B show the structure of a light distribution panel in accordance with a 23 rd  embodiment of the present invention. 
           [0050]      FIGS. 36 ,  36 A show the structure of a light distribution panel in accordance with a 24 th  embodiment of the present invention. 
           [0051]      FIGS. 37 ,  37 A and  37 B show the structure of a light distribution panel in accordance with a 25 th  embodiment of the present invention. 
           [0052]      FIG. 38  is a schematic drawing showing an application example of the present invention in a solar collector panel. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0053]    Referring to  FIGS. 4 ,  4 A and  4 B, the drawings illustrate the structure and principle of the present invention and explain the operation of the present invention in controlling the movement of light rays. 
         [0054]    Referring to  FIG. 4 , a light distribution panel  401  is shown having multiple faces. When two incident light rays  402  fall upon one face  403  of the light distribution panel  401  at one same angle and go to another face  404  after refraction, the contained angle between the incident light rays  402  and the normal line  405  is smaller than the critical angle of the light distribution panel. Subject to refraction law, the light rays are refracted out of the light distribution panel. 
         [0055]    When changing the angle of the face  404  shown in  FIG. 4  to the angle of the face  407  shown in  FIG. 4A , the contained angle between the incident light rays  402  and the normal line  408  is greater than the critical angle of the light distribution panel. Subject to reflection law (the angle of incidence is equal to the angle of reflection), the light rays are reflected rightwardly upwards to another face  409 . At this time, the contained angle between the incident light rays and the normal line  410  of the face  409  is smaller than the critical angle of the light distribution panel. Subject to refraction law, the light rays are refracted out of the light distribution panel. 
         [0056]    When changing the angle of the face  409  shown in  FIG. 4A  to the angle of the faces  411  and  413  shown in  FIG. 4B , the contained angle between one incident light ray  402   a  and the normal line  412  of the face  411  is 54.9°, greater than the critical angle of the light distribution panel, and therefore, subject to reflection law, the light ray is reflected rightwardly upwards toward another face  415 . At this time, the contained angle between the incident light and the normal line  416  is smaller than the critical angle of the light distribution panel, and therefore this light ray is reflected out of the light distribution panel. Further, the contained angle between the other incident light ray  402   b  and the normal line  414  of the face  413  62.3° is greater than the critical angle of the light distribution panel, therefore, subject to reflection law, the light ray is reflected in the light distribution panel rightwardly upwards toward another face  415 . At this time, the contained angle between the incident light and the normal line  417  is smaller than the critical angle of the light distribution panel, and therefore the light ray is refracted out of the light distribution panel subject to refraction law. 
         [0057]    Therefore, by means of properly adjusting the tilting angle, curvature and surface area of every face of a multiple-face light distribution panel the light path is controlled toward the expected illumination area. 
         [0058]    Exemplars of the present invention will now be described hereinafter.  FIGS. 5 and 5A  show a light distribution panel having multiple faces for producing a light distribution curve in accordance with a first embodiment of the present invention. The light distribution panel  501  has a center face  502  that is a light receiving face disposed at the center of the top side, a face  50  that is a light reflection face disposed at the bottom side, multiple peripheral faces  504 ˜ 510  of different specifications for reflecting or refracting light incident light rays from different angles toward a predetermined illumination area, and a top face  511  disposed at the top side for refracting all incident light rays out of the light distribution panel  501  toward the illumination area. All the faces are arranged around a center reference line  512 , constituting a circular light distribution panel. The tilting angle, curvature and surface area of every face are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0059]      FIG. 6  is a schematic drawing showing light path control of the light distribution panel in accordance with the first embodiment of the present invention. When incident light rays  602  fall upon a center face  603  of a light distribution panel  601  at a same incident angle, all the light rays are refracted in the light distribution panel toward the inside of a face  604 . At this time, the incident angle is greater than the critical angle of the light distribution panel, therefore the light rays are reflected- rightwardly upwards at an angle equal to the incident angle toward different faces of different specifications. The light rays that fall upon the face  605  at an incident angle greater than the critical angle of the light distribution panel are reflected to the top face  611 . Because the incident angle of the light rays that fall upon the top face  611  is smaller than the critical angle of the light distribution panel, these light rays are refracted onto a predetermined illumination area. The incident angle of the light rays that fall upon the face  606  is greater than the critical angle of the light distribution panel, and therefore these light rays are reflected upwardly onto the top face  611 . At this time, the incident angle of the light rays is greater than the critical angle of the light distribution panel, and therefore these light rays are reflected onto the predetermined illumination area. The other light rays go in a similar manner toward the predetermined illumination area. However, because the light rays fall upon different faces of different specifications, they are reflected at different angles. From the range  612  within which the light rays are reflected out of the light distribution panel, the light distribution panel having multiple faces for producing a light distribution curve effectively control the moving directions of light rays toward a predetermined illumination area, achieving the effects of broad illumination and even distribution of light. 
         [0060]      FIGS. 7 ,  7 A and  7 B show a light distribution panel having multiple faces for producing a light distribution curve in accordance with a second embodiment. The light distribution panel  701  according to this second embodiment is substantially similar to the aforesaid first embodiment with the exception that the multiple faces are arranged around a center reference line  702  at one half side to form a semicircular light distribution panel. The other half structure at the other side relative to the center reference line has a top face  703  that is a light receiving face for receiving light from a light source, three bottom faces  705 ˜ 707  of different specifications at the bottom side for reflecting light, a first lateral face  708  at one lateral side for refracting light, and an arched second lateral face  704  at the opposite lateral side for reflecting light. The tilting angle, curvature and surface area of every face of the light distribution panel are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0061]      FIG. 8  is a schematic drawing showing light path control of the light distribution panel in accordance with the second embodiment of the present invention. When incident light rays  802  fall upon a light receiving face  810  at the center area of the light distribution panel  801 , these light rays are refracted and/or reflected in the same manner as shown in  FIG. 6 . When multiple incident light rays enter the light receiving face  804  of the other half structure of the light distribution panel  801  at the other side relative to the center reference line at a same incident angle are not refracted and go directly to the three bottom faces  805 ˜ 807  at the bottom side. The incident angles of these light rays that enter the three bottom faces  805 ˜ 807  are greater than the critical angle of the light distribution panel  801 . Therefore, these light rays are not refracted out of the light distribution panel  801  but reflected rightwards at different angles of reflection onto the right lateral face  808 . The incident angles of the light rays that fall upon the right lateral face  808  are smaller than the critical angle of the light distribution panel  801 . Therefore, these light rays are refracted rightwardly out of the light distribution panel  801  onto the face  809  and then refracted onto the inside of the light distribution panel  801 , and then reflected upwards by the faces of different specifications at the right side onto the illumination area. This process is same as that shown in  FIG. 6 , and therefore no further description in this regard is necessary. Therefore, the light distribution panel of this second embodiment enables the major part of the light rays to be radiated onto the predetermined illumination area. 
         [0062]      FIGS. 9 and 9A  show a light distribution panel having multiple faces for producing a light distribution curve in accordance with a third embodiment. The light distribution panel  901  according to this third embodiment has a top face  902  partially designed for receiving light from a light source, a first bottom face  903  that is a reflection face for reflecting light, a second bottom face  912  that is a refraction face for refracting light, and multiple lateral faces  904 ˜ 910  of different specifications. Most lateral faces are designed to reflect light at a different reflection angle. The other lateral faces are designed to refract light at a different refraction angle. Light rays that fall upon these lateral faces finally go to a predetermined illumination area. The faces of this light distribution panel are arranged around a center reference line  911 , forming a circular configuration. Further, the tilting angle, curvature and surface area of every face are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0063]      FIG. 10  is a schematic drawing showing light path control of the light distribution panel in accordance with the third embodiment of the present invention. When incident light rays  1002  fall upon the center area of the light receiving face  1003  of the light distribution panel  1001  at a same incident angle, these light rays directly go to the bottom face  1004  without refraction. Because the incident angles of the light rays that fall upon the bottom face  104  are greater than the critical angle of the light distribution panel  1001 , these light rays reflected rightwards onto the lateral faces at a respective reflection angle corresponding to the respective incident angle. The incident angles of the light rays that fall upon the face  1005  are smaller than the critical angle of the light distribution panel, therefore the light rays that fall upon the face  1005  are refracted onto the predetermined illumination area. The incident angles of the light rays that fall upon the face  1006  are smaller than the critical angle of the light distribution panel, therefore the light rays that fall upon the face  1006  are refracted onto the predetermined illumination area. The incident angles of the light rays that fall upon the face  1007  are smaller than the critical angle of the light distribution panel, therefore the light rays that fall upon the face  1007  are refracted onto the predetermined illumination area. The incident angles of the light rays that fall upon the face  1008  are smaller than the critical angle of the light distribution panel, therefore the light rays that fall upon the face  1008  are refracted onto the predetermined illumination area. The incident angle of the light rays that fall upon the face  1009  are greater than the critical angle of the light distribution panel, therefore the light rays that fall upon the face  1009  are reflected onto the bottom face  1011 . However, because the incident angles of the light rays that are reflected by the face  1009  onto the bottom face  1011  are smaller than the critical angle of the light distribution panel, these light rays are then refracted onto the predetermined illumination area. Further, the incident angles of the light rays that fall upon the face  1010  are greater than the critical angle of the light distribution panel, therefore the light rays that fall upon the face  1010  are reflected downwardly onto the bottom face  1011 . However, because the incident angles of the light rays that are reflected by the face  1010  onto the bottom face  1011  are smaller than the critical angle of the light distribution panel, these light rays are then refracted onto the predetermined illumination area. Therefore, the light distribution panel of this third embodiment effectively controls the moving direction of light rays toward the expected illumination area, achieving the effects of broad illumination and even distribution of light. 
         [0064]      FIGS. 11 ,  11 A and  11 B show a light distribution panel in accordance with a fourth embodiment of the present invention. According to this fourth embodiment, the light distribution panel  1101  is substantially similar to the aforesaid third embodiment with the exception that with the exception that the multiple faces of the light distribution panel  1101  according to this fourth embodiment are arranged around a center reference line  1102  at one side to form a semicircular light distribution panel. The other half structure at the other side relative to the center reference line  1102  has a top face  1103  that is a light receiving face for receiving light from a light source, three bottom faces  1105 ,  1106  and  1107  of different specifications at the bottom side for reflecting light, a first lateral face  1108  at one lateral side for refracting light, and an arched second lateral face  1104  at the opposite lateral side for reflecting light. The tilting angle, curvature and surface area of every face of the light distribution panel  1101  are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0065]      FIGS. 12 ,  12 A and  12 B show a light distribution panel in accordance with a fifth embodiment of the present invention. According to this fifth embodiment, the light distribution panel  1201  comprises a bottom face  1203  for reflecting light, a plurality of lateral faces  1204 ˜ 1210  for refracting or reflecting light at a different angle toward a predetermined illumination area, and a top face  1211  for refracting light out of the light distribution panel  1201  onto the predetermined illumination area. The faces of the light distribution panel  1201  are arranged on or around a center reference line, thereby constituting a rectangular light distribution panel. The tilting angle, curvature and surface area of every face of the light distribution panel  1201  are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0066]      FIGS. 13 ,  13 A and  13 B show a light distribution panel in accordance with a sixth embodiment of the present invention. According to this fifth embodiment, the structure of the right half of the light distribution panel  1301  relative to the top imaginary line  1309  is substantially similar to the aforesaid fifth embodiment. The left half of the light distribution panel  1301  comprises a top face  1302  that is a light receiving face for receiving light from a light source, three bottom faces  1304 ,  1305  and  1306  of different specifications designed to reflect light, two right lateral faces  1307 . and  1308  for refracting light, and one left lateral face  1303  for reflecting light. The right half and left half of the light distribution panel constitute a rectangular configuration. Further, the tilting angle, curvature and surface area of every face of the light distribution panel  1301  are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0067]      FIGS. 14 ,  14 A and  14 B show a light distribution panel in accordance with a seventh embodiment of the present invention. According to this seventh embodiment, the light distribution panel  1401  comprises a top face  1401  that has its center area adapted for receiving light from a light source, a first bottom face  1403  designed to reflect light, a second bottom face  1412  designed to refract light, and a plurality of lateral faces  1404 ˜ 1410  of different specifications for reflecting or refracting light at different angles toward a predetermined illumination area. The faces are arranged on or around a center reference line  1411 , constituting a rectangular configuration. Further, the tilting angle, curvature and surface area of every face of the light distribution panel  1401  are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0068]      FIGS. 15 ,  15 A and  15 B show a light distribution panel in accordance with an eighth -embodiment of the present invention. According to this eighth embodiment, the light distribution panel  1501  has a right half and a left half divided by an imaginary line  1502 . The structure of the right half of the light distribution panel  1501  is substantially to the right half of the aforesaid seventh embodiment. The left half of the light distribution panel  1501  comprises a top face  1503  that is a light receiving face for receiving light from a light source, three bottom faces  1505 ,  1506  and  1507  of different specifications for reflecting light, a right lateral face  1508  for refracting light, and a left lateral face  1504  for reflecting light. The right half and left half of the light distribution panel constitute a rectangular configuration. Further, the tilting angle, curvature and surface area of every face of the light distribution panel  1501  are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0069]      FIGS. 16 and 16A  show a light distribution panel in accordance with a ninth embodiment of the present invention. According to this ninth embodiment, the light distribution panel  1601  comprises a top center face  1602  and a plurality of top border faces  1603 ˜ 1606  adapted for receiving light from a light source, a bottom refractive lens  1612  for refracting light, and a plurality of lateral faces  1607 ˜ 1611  of different specifications for reflecting light at different angles toward a predetermined illumination area. Based on a center reference line  1613 , the faces constitute a circular configuration. Further, the tilting angle, curvature and surface area of every face of the light distribution panel  1601  are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0070]      FIGS. 17 and 17A  show a light distribution panel in accordance with a tenth embodiment of the present invention. According to this tenth embodiment, the light distribution panel  1701  comprises a plurality of top faces  1702 ˜ 1708  designed for receiving light from a light source, a bottom face  1713  designed for refracting light, and a plurality of lateral faces  1709 ˜ 1712  of different specifications for reflecting light at different angles toward a predetermined illumination area. Based on a center reference line  1714 , the. faces constitute a circular configuration. Further, the tilting angle, curvature and surface area of every face of the light distribution panel  1701  are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0071]      FIGS. 18 ,  18 A and  18 B show a light distribution panel in accordance with a 11 th  embodiment of the present invention. According to this 11 th  embodiment, the light distribution panel  1801  comprises multiple sets of faces  1802 ,  1803  and  1804  of different specifications. The tilting angle, curvature and surface area of every face of the light distribution panel  1801  are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0072]      FIGS. 19 ,  19 A and  19 B show a light distribution panel in accordance with a 12 th  embodiment of the present invention. According to this 12 th  embodiment, the light distribution panel  1901  comprises multiple sets of faces  1902 ˜ 1906  of different specifications. The tilting angle, curvature and surface area of every face of the light distribution panel  1901  are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0073]      FIGS. 20 ,  20 A and  20 B show a light distribution panel in accordance with a 13 th  embodiment of the present invention. According to this 13 th  embodiment, the light distribution panel  2001  comprises multiple sets of faces  2002 ,  2003  and  2004  of different specifications. The tilting angle, curvature and surface area of every face of the light distribution panel  2001  are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0074]      FIGS. 21 ,  21 A and  21 B show a light distribution panel in accordance with a 14 th  embodiment of the present invention. According to this 14 th  embodiment, the light distribution panel  2101  comprises multiple sets of faces  2102 ˜ 2108  of different specifications. The tilting angle, curvature and surface area of every face of the light distribution panel  2101  are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0075]      FIG. 22  shows a first application example of the present invention. According to this first application example of the present invention, the light distribution panel is used in a floor lamp that comprises a lamp stand  2201 , a lamp  2202  fixedly provided at the top side of the lamp stand  2201 , a light source  2203  upwardly arranged in the lamp  2202 , and a light distribution panel  2204  selected from the aforesaid 1 st ˜14 th  embodiments of the present invention and arranged around the lamp  2202 . According to this application example, the light distribution panel  2204  is prepared subject to the 1 st  embodiments of the present invention. Light rays from the light source  2203  are refracted and reflected through the light distribution panel  2204  toward the floor. 
         [0076]      FIG. 23  shows a second application example of the present invention. According to this second application example of the present invention, the light distribution panel is used in a floor lamp that comprises a lamp stand  2301 , a lamp  2302  fixedly provided at the top side of the lamp stand  2301 , a light source  2303  upwardly arranged in the lamp  2302 , a light distribution panel  2304  selected from the aforesaid 1 st ˜14 th  embodiments of the present invention, for example, the first embodiment of the present invention and arranged around the lamp  2302 , and an opaque lampshade  2305  covered on the top side of the light distribution panel  2304 . Light rays from the light source  2303  are refracted and reflected through the light distribution panel  2304  toward the floor. 
         [0077]      FIG. 24  shows a third application example of the present invention. According to this third application example, the light distribution panel is used in a floor lamp that comprises a lamp stand  2401 , an opaque lampshade  2402  fastened to the horizontally extending upper part of the lamp stand  2401 , a light source  2404  suspending inside the opaque lampshade  2402 , a reflector  2403  mounted inside the opaque lampshade  2402  over the light source  2404  for reflecting light from the light source  2404  downwardly toward the floor, and a light distribution panel  2405  selected from the aforesaid 1 st ˜14 th  embodiments of the present invention and arranged at the bottom side of the lamp that is formed of the aforesaid opaque lampshade  2402 , reflector  2403  and light source  2404 . According to this application example, the light distribution panel  2405  is prepared subject to the 3 rd  embodiments of the present invention. Light rays from the light source  2403  are refracted and reflected through the light distribution panel  2205  toward the floor. 
         [0078]      FIGS. 25 and 25A  show a light distribution panel in accordance with a 15 th  embodiment of the present invention. According to this 15 th  embodiment, the light distribution panel  2501  comprises a top face  2502  adapted for the input and output of light, a plurality of bottom faces  2503 ,  2504  and  2505  of different specifications for reflecting light, and a protruded mounting face  2506  for mounting. The faces  2502 ˜ 2505  are based on a center reference line  2507 , constituting a circular configuration. The tilting angle, curvature and surface area of every face of the light distribution panel  2501  are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0079]      FIGS. 26 and 26A  show a light distribution panel in accordance with a 16 th  embodiment of the present invention. According to this 16 th  embodiment, the light distribution panel  2601  comprises a top face  2602  for output of light, a peripheral face  2603  for output of light, a plurality of bottom faces  2604  and  2605  for reflecting light, and a protruded mounting face  2606  extending around the periphery of the bottom side for mounting. Based on a center reference line  2607 , the faces  2602 ˜ 2606  constitute a circular configuration. Further, the top face  2602  has raised portions  2608  for output of light and for providing an anti-skip effect. Further, the tilting angle, curvature and surface area of every face of the light distribution panel  2601  are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0080]      FIGS. 27 and 27A  show a light distribution panel in accordance with a 17 th  embodiment of the present invention. According to this 17 th  embodiment, the light distribution panel  2701  comprises a top face  2702  for output of light, a peripheral face  2703  for receiving light from a light source, a plurality of bottom faces  2704  and  2705  for reflecting light, and a protruded mounting face  2706  extending around the periphery of the bottom side for mounting. Based on a center reference line  2707 , the faces  2702 ˜ 2706  constitute a circular configuration. Further, the top face  2602  has raised portions  2608  for output of light and for providing an anti-skip effect. Further, the tilting angle, curvature and surface area of every face of the light distribution panel  2701  are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0081]      FIGS. 28 ,  28 A and  28 B show a light distribution panel in accordance with a 18 th  embodiment of the present invention. According to this 18 th  embodiment, the light distribution panel  2801  comprises a top face  2802  for input and output of light, a plurality of bottom faces  2803 ,  2804  and  2805  for reflecting light, and a protruded mounting face  2806  extending around the periphery of the bottom side for mounting. Further, the tilting angle, curvature and surface area of every face of the light distribution panel  2801  are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0082]      FIGS. 29 ,  29 A and  29 B show a light distribution panel in accordance with a 19 th  embodiment of the present invention. According to this 19 th  embodiment, the light distribution panel  2901  comprises a top face  2902  for output of light, a peripheral face  2903  for input of light, a plurality of bottom faces  2904  and  2905  for reflecting light, and a protruded mounting face  2906  extending around the periphery of the bottom side for mounting. The top face  2902  has a plurality of raised portions  2908  for output of light and for providing an anti-skip effect. Further, the tilting angle, curvature and surface area of every face of the light distribution panel  2901  are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0083]      FIGS. 30 ,  30 A and  30 B show a light distribution panel in accordance with a 20 th  embodiment of the present invention. According to this 20 th  embodiment, the light distribution panel  3001  comprises a top face  3002  for output of light, a peripheral face  3003  for input of light, a plurality of bottom faces  3004  and  3005  for reflecting light, and a protruded mounting face  3006  extending around the periphery of the bottom side for mounting. Based on a center reference line  3007 , the faces  3002 ˜ 3006  constitute a rectangular configuration. Further, the tilting angle, curvature and surface area of every face of the light distribution panel  3001  are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0084]    Referring to  FIG. 31 , a light distribution panel  3101  is constructed subject to one of the aforesaid 15 th ˜20 th  embodiments of the present invention, for example, the 15 th  embodiment, and fixedly fastened to a road  3102  for use as a road divider and reflector. When light rays  3103  from the headlights of a moving vehicle fall upon the outer face  3104  of the light distribution panel  3101 , these incident light rays are refracted onto a first internal face  3105 , due to that the incident angle is greater than the critical angle of the light distribution panel. When light rays enter the first internal face  3105 , the incident angles of the light rays are greater than the critical angle of the light distribution panel, and therefore these light rays are refracted rightwards by this first internal face  3105  onto a second internal face  3106 . When light rays enter this second internal face  3106 , the incident angles of these light rays are greater than the critical angle of the light distribution panel, and therefore these light rays are refracted toward the outer face  3104 . Because the incident angles of these light rays are greater than the critical angle of the light distribution panel, these light rays go out of the outer face  3104  of the light distribution panel  3101 . Therefore, a car driver can see clearly the indication of the light distribution panel  3101 , assuring safety. 
         [0085]      FIG. 32  illustrate a convex lens  3201  formed of a light distribution panel according to the present invention and having a solar collector  3203  on the focal point of the convex lens  3201 . When light rays fall upon the convex lens  3201 , light rays are condensed onto the solar collector  3203 . According to this fixed design, the limited light receiving angle of the convex lens  3201  is functioning to condense sunlight onto the solar collector  3203  within a limited time period. To extend the working time period, as shown in  FIG. 32A , a mechanical device  3204  is used to support the structure shown in  FIG. 32 . This mechanical device  3204  moves the structure shown in  FIG. 32  subject to the moving direction and speed of the earth relative to the sun. This arrangement effectively improves solar energy collection efficiency, however the installation cost is relatively raised. 
         [0086]    When using a light distribution panel constructed according to the present invention in a solar system to condense the light of the sun, the effective sunlight condensing time is greatly prolonged. The use of a light distribution panel in a solar system simply increases a small amount of material cost, however it greatly improves the performance of the solar system. The invention has industrial value for use in a low-power solar system. Following embodiments are practical for use in a solar system for condensing sunlight. 
         [0087]      FIGS. 33 and 33A  show a light distribution panel in accordance with a 21 st  embodiment of the present invention. According to this 21 st  embodiment, the light distribution panel  3301  comprises a top center face  3302  for input of light, a plurality of peripheral faces  3303 ˜ 3314  arranged around the top center face  3302  for reflecting light, a bottom center face  3329  for refracting light, a plurality of bottom border faces  3317 ˜ 3328  for reflecting light, and two lateral faces  3315  and  3316  for reflecting light. Based on a center reference line  3330 , these faces  3302 ˜ 3329  constitute a circular configuration. Further, the tilting angle, curvature and surface area of every face of the light distribution panel  3301  are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0088]      FIGS. 34 ,  34 A and  34 B show a light distribution panel in accordance with a 22 nd  embodiment. According to this 22 nd  embodiment, the light distribution panel  3401  has a right half and a left half divided by a center imaginary line  3402 . The structure of the right half is same as the aforesaid 21 st  embodiment with the exception that the faces are based on the center imaginary line  3402 , constituting a rectangular configuration. Further, the tilting angle, curvature and surface area of every face of the light distribution panel  3401  are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0089]      FIGS. 35 ,  35 A and  35 B show a light distribution panel in accordance with a 23 rd  embodiment of the present invention. This 23 rd  embodiment is substantially similar to the aforesaid 22 nd  embodiment with the exception that the top center area of the light distribution panel  3501  is an arched face  3502 . Further, the tilting angle, curvature and surface area of every face of the light distribution panel  3501  are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0090]      FIGS. 36 and 36A  show a light distribution panel in accordance with a 24 th  embodiment of the present invention. According to this 24 th  embodiment, the light distribution panel  3601  comprises a top center face  3602  for input of light, a plurality of faces  3603  arranged around the top center face  3602  for reflecting light, a bottom center face  3629  that is a refracting face for output of light, a plurality of faces  3617 ˜ 3628  arranged around the bottom center face  3629  for reflecting light, and two lateral faces  3615  and  3616  for reflecting light. Based on a center reference line  3631 , these faces  3602 ˜ 3629  constitute a circular configuration. Further, the light distribution panel  3601  further comprises a through hole  3630  at the center of the bottom side. The size of the through hole  3630  is smaller than the bottom center face  3629 . Further, the tilting angle, curvature and surface area of every face of the light distribution panel  3601  are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0091]      FIGS. 37 ,  37 A and  37 B show a light distribution panel in accordance with a 25 th  embodiment of the present invention. According to this 25 th  embodiment, the light distribution panel  3701  is divided by a center imaginary line  3702  into a right half and a left half. The structure of the right half is same as the aforesaid 24 th  embodiment with the exception that the faces according to this 25 th  embodiment constitute a rectangular configuration. Further, the light distribution panel  3701  has a through hole  3704  cut through the center of the panel  3703 . Further, the tilting angle, curvature and surface area of every face of the light distribution panel  3701  are respectively designed subject to the respective desired angle of refraction or reflection. 
         [0092]      FIG. 38  shows still another application example of the present invention. According to this application example, the light distribution panel  3801  is prepared subject to the aforesaid 21 st  embodiment, having the center of the bottom side thereof mounted with a solar collector panel  3802 . If the incident angles of sunlight that falls upon the top light-receiving face  3803  are within the range of 25-degrees between 42°  3803  and 17°  3809  relative to the vertical line, incident light rays are refracted in the light distribution panel  3801 . When these light rays enter a light distribution curve  3804  formed of a number of faces, onto different faces of the light distribution panel  3801 , they are reflected into parallel light rays. When light rays fall upon the face  3805 , the incident angles of these light rays are greater than the critical angle of the light distribution panel, and therefore they are reflected upwardly leftwards toward the face  3806  where the incident angles of the light rays are greater than the critical angle of the light distribution panel. Therefore, the light rays that fall upon the face  3806  are reflected upwardly rightwards a light distribution curve  3807  that is formed of a number of faces. When light rays fall upon the light distribution curve  3807 , they are reflected toward the bottom center face  3808  and condensed onto the solar collector panel  3802 . When the incident angle of sunlight that falls upon the top light receiving face  3817  is smaller than 17°  3809  relative to the vertical line, incident light rays are refracted by the top light receiving face  3817  onto the inside of the light distribution panel. When light rays reach the bottom face  3808 , they are refracted onto the border are of the solar collector panel  3802 . The light rays that fall upon the light distribution panel at an angle relatively closer to the vertical line can be radiated onto the solar collector panel over a relatively larger area. When light rays  3801  fall vertically upon the top side of the light distribution panel, the range where light rays are. radiated onto the solar collector panel reaches the maximum level. When light rays are moving toward the left side, the range where light rays are radiated onto the solar collector panel is relatively reduced. When light rays enter the range where the incident angle relative to the vertical line is greater than 17°, the radiation range of the incident light is beyond the collar collector panel  3802  and enters the range of the light distribution curve  3812  of the light distribution panel. The light rays of which the incident angles are within the range of 25-degrees between 42° and 17° relative to the vertical line are reflected by the light distribution curve  3812 , the face  3813 , the face  3814  and the light distribution curve  3815  onto the solar collector panel  3802 . 
         [0093]    The aforesaid various embodiments of the present invention are practical for use in conventional lighting fixtures to substitute for a conventional light transmitting lampshade, for making road lines or road reflectors, or for use in a solar collection system for gathering solar energy onto a solar collector panel. 
         [0094]    Although particular embodiments of the invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.