Abstract:
An optical lens includes a incident curved surface, a cone-shaped body, and a emitting curved surface. Light emitted from a light emitting diode (LED) has a first refraction angle on a first plane and a second refraction angle on a second plane after passing through the incident curved surface, the cone-shaped body, and the emitting curved surface. The first refraction angle is between 105 degrees and 145 degrees, and the second refraction angle is between 38 degrees and 65 degrees. The light is asymmetrically distributed on the second plane. Therefore, when the optical lens is applied to a street lamp, the light utilization on a road side may be increased.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of Invention 
         [0002]    The present invention relates to an optical lens and an optical lens plate, and more particularly to an optical lens and an optical lens plate capable of achieving asymmetric distribution of light on a second plane. 
         [0003]    2. Related Art 
         [0004]    With the enhancement of people&#39;s awareness of environmental protection, various green electronic products have received attention according to the energy-saving and carbon-reduction effect. Due to characteristics of small volume, high brightness, long service life, and low power consumption, light emitting diode (LED) become an outstanding lighting appliance in the world wide. For example, the LED is used as a light source of traffic lights and flashlights in daily life. In addition to the application in traffic lights and flashlights, the LED can also be applied to street lamps. 
         [0005]    Light emitted from the LED should meet requirements of a specific light distribution for street lamp lighting. An optical lens plate, mechanism design and arrangement are used to enable the light emitted from the LED to meet the requirement for a particular light distribution. The light distribution is an illuminated range formed by light projected from a lighting device on a road surface. 
         [0006]    Persons skilled in the art proposed an LED street lamp meeting the requirement for different light distributions by means of an optical lens plate or arrangement. But in this method, a combination of more than two kinds of optical lenses needs to be adopted, and different kinds of optical lenses need to cooperate with each other in accordance with a certain ratio to achieve the required light distribution. Therefore, problems of excessively high cost of mold design and increasing development and test time due to ratio adjustment exist. Moreover,  FIG. 1A  is a schematic cross-sectional structural view of an embodiment wherein a conventional LED street lamp uses an optical lens plate to meet requirements for different light distributions. In this embodiment, an LED street lamp  10  includes a plurality of LEDs  12  and an optical lens plate  14 , and the optical lens plate  14  includes a plurality of optical lenses  16  and a substrate  18 . Each optical lens  16  is disposed on the substrate  18 , and the optical lenses  16  correspond to the LEDs  12 . light  19  which has the large incident angle emitted from each LED  12  may be easily lost due to total reflection of the light  19  caused by the forming thickness requirement of the optical lens plate  14  (that is, the substrate  10  needs to have a certain thickness), thereby reducing the light-emitting efficiency of the optical lens plate  14 . 
         [0007]    Furthermore,  FIG. 1B  is a schematic view for illustrating use of an embodiment of a conventional LED street lamp on a first plane,  FIG. 1C  is a schematic view for illustrating use of the embodiment of the conventional LED street lamp on a second plane,  FIG. 1D  is a luminous intensity distribution curve of the embodiment of the conventional LED street lamp, and  FIG. 1E  is a schematic view illustrating a relation between a road side and a non-road side of light utilization of the embodiment of the conventional LED street lamp. In this embodiment, a light distribution on the first plane (that is, a dotted line in  FIG. 1D , namely, the light distribution on a Y-Z plane) and a light distribution on the second plane (that is, the light distribution shown by a solid line in  FIG. 1D , namely, the light distribution on an X-Z plane) of the LED street lamp are both substantially symmetric light distribution. However, the utilization of the LED street lamp with a symmetric light distribution on the road side (that is, a dotted line SS in  FIG. 1E ) to that on the non-road side (that is, a solid line HS in  FIG. 1E ) is about 50% to 50% (for example, one half of the light is projected to the road surface, and the other half of the light is projected to a building or a rice field), thereby causing light pollution to the non-road side (for example, the light projected to the building will interfere with the quality of human sleep or the light projected to the rice field will interfere with the growth of paddy rice.). 
         [0008]    In order to solve the problems, the conventional LED street lamp employs adjustment of the mechanism design (for example, increasing an elevation angle of the LED street lamp) to meet the requirement for a specific light distribution. Therefore, problems that the design is complex and the assembly and production is not easy exist, thereby increasing the manufacturing cost of the street lamp. 
       SUMMARY OF THE INVENTION 
       [0009]    Accordingly, the present invention is an optical lens and an optical lens plate, which can solve problems such as light pollution, low light utilization, and high manufacturing cost due to a complex design in the prior art when being applied in a street lamp. 
         [0010]    The present invention provides an optical lens, which is applicable for receiving light emitted from an LED, wherein the LED comprises a first optical axis. In an embodiment, the optical lens comprises an incident curved surface, a cone-shaped body, and an emitting curved surface. The incident curved surface is used for receiving the light, and the light has a first refraction angle on a first plane and a second refraction angle on a second plane after passing through the incident curved surface, the cone-shaped body, and the emitting curved surface. The first refraction angle is between 105 degrees and 145 degrees, the second refraction angle is between 38 degrees and 65 degrees, and the light is asymmetrically distributed on the second plane. 
         [0011]    In an embodiment of the optical lens, the cone-shaped body comprises a first surface and a second surface, there is a first angle between the first surface and the second surface, and the first angle is between 10 degrees and 65 degrees. 
         [0012]    In an embodiment of the optical lens, the incident curved surface comprises a second incident curved surface, the second incident curved surface comprises a first curved line, the first curved line comprises two first end points, there is a second angle between a connecting line between the first end points and the second surface, and the second angle is between 30 degrees and 60 degrees. 
         [0013]    In an embodiment of the optical lens, the optical lens further comprises a lead angle surface, the lead angle surface may comprises a first line segment, and the first line segment comprises two second end points. There is a third angle between a connecting line between the second end points and the first optical axis, and the third angle is between 20 degrees and 50 degrees. 
         [0014]    In an embodiment of the optical lens, the emitting curved surface is an M-shaped curved surface, the M-shaped curved surface comprises a central axis, and the central axis coincides with the first optical axis. 
         [0015]    The present invention provides an optical lens plate, which is applicable to a lamp, the lamp has a plurality of light emitting diodes (LEDs), each LED comprises a first optical axis and is used for emitting light. In an embodiment, the optical lens plate comprises a substrate and a plurality of optical lenses, each optical lens is disposed on the substrate, and the optical lenses correspond to the LEDs. Each optical lens comprises an incident curved surface, a cone-shaped body, and a emitting curved surface. The incident curved surface is used for receiving the light, and the light has a first refraction angle on a first plane and a second refraction angle on a second plane after passing through the incident curved surface, the cone-shaped body, and the emitting curved surface. The first refraction angle is between 105 degrees and 145 degrees, the second refraction angle is between 38 degrees and 65 degrees, and the light is asymmetrically distributed on the second plane. 
         [0016]    In an embodiment of the optical lens plate, the cone-shaped body comprises a first surface and a second surface, there is a first angle between the first surface and the second surface, and the first angle is between 10 degrees and 65 degrees. 
         [0017]    In an embodiment of the optical lens plate, the incident curved surface comprises a second incident curved surface, the second incident curved surface comprises a first curved line, and the first curved line comprises two first end points. There is a second angle between a connecting line between the first end points and the second surface, and the second angle is between 30 degrees and 60 degrees. 
         [0018]    In an embodiment of the optical lens plate, the optical lens further comprises a lead angle surface, the lead angle surface may comprises a first line segment, and the first line segment comprises two second end points. There is a third angle between a connecting line between the second end points and the third optical axis and is between 20 degrees and 50 degrees. 
         [0019]    In an embodiment of the optical lens plate, the emitting curved surface is an M-shaped curved surface, the M-shaped curved surface comprises a central axis, and the central axis coincides with the first optical axis. 
         [0020]    With the optical lens and the optical lens plate of the present invention, the second refraction angle on the second plane is changed through adjustment of a relative relation between the incident curved surface, the cone-shaped body and the design of the cone-shaped body. With the design of the lead angle surface, the utilization of the light is increased. Through adjustment of a relative relation between the light guide angle and the LED and a relative relation between the incident curved surface and the emitting curved surface, the first refraction angle on the first plane is changed. The optical lens plate of the present invention is applicable to a lamp, wherein an asymmetric light intensity distribution is achieved through the design of a single type of optical lens. Therefore, the luminous intensity distribution curve of the optical lens and the optical lens plate of the present invention has an asymmetric light distribution, so that the problems such as light pollution, low light utilization, and high manufacturing cost due to a complex design in the prior art can be solved when the optical lens and the optical lens plate of the present invention are applied to a street lamp. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0021]    The present invention will become more fully understood from the detailed description given herein below for illustration only, and thus are not limitative of the present invention, and wherein: 
           [0022]      FIG. 1A  is a schematic cross-sectional structural view of an embodiment in which a conventional LED street lamp uses a lens plate to meet requirements for different light distribution; 
           [0023]      FIG. 1B  is a schematic view for illustrating use of an embodiment of a conventional LED street lamp on a first plane; 
           [0024]      FIG. 1C  is a schematic view for illustrating use of the embodiment of the conventional LED street lamp on a second plane; 
           [0025]      FIG. 1D  is a luminous intensity distribution curve of the conventional LED street lamp according to an embodiment; 
           [0026]      FIG. 1E  is a schematic view illustrating a relation between a road side and a non-road side of light utilization of the embodiment of the conventional LED street lamp; 
           [0027]      FIG. 2A  is a schematic three-dimensional structural view of an embodiment of an optical lens plate of the present invention; 
           [0028]      FIG. 2B  is a schematic cross-sectional structural view along line  2 B- 2 B of  FIG. 2A ; 
           [0029]      FIG. 2C  is a schematic structural cross-sectional view along line  2 C- 2 C of  FIG. 2A ; 
           [0030]      FIG. 3A  is a schematic structural view of an embodiment wherein the optical lenses board in  FIG. 2B  is applied to a lamp; 
           [0031]      FIG. 3B  is a schematic structural view of an embodiment wherein the optical lens plate in  FIG. 2C  is applied to a lamp; 
           [0032]      FIG. 4  is a schematic view of a first refraction angle and a second refraction angle of an embodiment of the optical lens in  FIG. 2A ; 
           [0033]      FIG. 5A  is a luminous intensity distribution curve in which a first angle in  FIG. 3A  is 10 degrees; 
           [0034]      FIG. 5B  is a luminous intensity distribution curve in which the first angle in  FIG. 3A  is 25 degrees; 
           [0035]      FIG. 5C  is a luminous intensity distribution curve in which the first angle in  FIG. 3A  is 40 degrees; 
           [0036]      FIG. 5D  is a luminous intensity distribution curve in which the first angle in  FIG. 3A  is 60 degrees; 
           [0037]      FIG. 5E  is a luminous intensity distribution curve in which the first angle in  FIG. 3A  is 65 degrees; 
           [0038]      FIG. 6A  is a luminous intensity distribution curve in which a second angle in  FIG. 3A  is 30 degrees; 
           [0039]      FIG. 6B  is a luminous intensity distribution curve in which the second angle in  FIG. 3A  is 35 degrees; 
           [0040]      FIG. 6C  is a luminous intensity distribution curve in which the second angle in  FIG. 3A  is 60 degrees; 
           [0041]      FIG. 7A  is a schematic structural view of a first embodiment of an optical lens of the present invention; 
           [0042]      FIG. 7B  is a schematic structural view of a second embodiment of the optical lens of the present invention; 
           [0043]      FIG. 7C  is a schematic structural view of a third embodiment of the optical lens of the present invention; 
           [0044]      FIG. 8A  is a luminous intensity distribution curve of the optical lens in  FIG. 7A ; 
           [0045]      FIG. 8B  is a luminous intensity distribution curve of the optical lens in  FIG. 7B ; 
           [0046]      FIG. 8C  is a luminous intensity distribution curve of the optical lens in  FIG. 7C ; 
           [0047]      FIG. 9  is a schematic structural views of another embodiment in which the optical lens plate of the present invention is applied to a lamp; 
           [0048]      FIG. 10A  is a schematic structural view of a fourth embodiment of the optical lens of the present invention; 
           [0049]      FIG. 10B  is a schematic structural view of a fifth embodiment of the optical lens of the present invention; 
           [0050]      FIG. 10C  is a schematic structural view of a sixth embodiment of the optical lens of the present invention; 
           [0051]      FIG. 11A  is a luminous intensity distribution curve of the optical lens in  FIG. 10A ; 
           [0052]      FIG. 11B  is a luminous intensity distribution curve of the optical lens in FIG.  10 B; and 
           [0053]      FIG. 11C  is a luminous intensity distribution curve of the optical lens in  FIG. 10C . 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0054]      FIG. 2A  is a schematic three-dimensional structural view of an embodiment of an optical lens plate of the present invention, and  FIG. 2B  is a schematic cross-sectional structural view along line  2 B- 2 B of  FIG. 2A . Referring to  FIGS. 2A and 2B , in this embodiment, an optical lens plate  200  comprises a substrate  202  and thirty optical lenses  204 , wherein the thirty optical lenses  204  are disposed on the substrate  202  in a 5×6 array (that is, a number of the optical lenses  204  disposed along a second axial direction Y is 5, and a number of the optical lenses  204  disposed along a first axial direction X is 6), but this embodiment is not intended to limit the present invention. That is, the number and the arrangement of the optical lenses  204  can be adjusted as required. Each optical lens  204  comprises an incident curved surface  206 , a cone-shaped body  208 , and an emitting curved surface  210 . The emitting curved surface  210  may be, but not limited to, an elliptical curved surface (referring to  FIG. 2C , which is a schematic cross-sectional view along line  2 C- 2 C of  FIG. 2A ). That is to say, the emitting curved surface  210  may also be an M-shaped curved surface, and the details will be described below. 
         [0055]      FIG. 3A  is a schematic structural view of an embodiment in which the optical lenses board in  FIG. 2B  is applied to a lamp, and  FIG. 3B  is a schematic structural view of an embodiment in which the optical lens plate in  FIG. 2C  is applied to a lamp. Referring to  FIGS. 2B and 2C , in this embodiment, a lamp  50  comprises a circuit board  52  and an optical lens plate  200 , wherein the optical lens plate  200  is disposed on the circuit board  52 . The circuit board  52  may have thirty LEDs  54 . Each optical lens  204  may correspond to each LED  54 , that is, the lenses  204  can correspond to the LEDs  54  in a one-to-one relation, but this embodiment is not intended to limit the present invention. Each LED  54  is used for emitting light  60  and comprises a first optical axis  56 . The incident curved surface  206  is used for receiving the light  60 . 
         [0056]    Since each of the optical lenses  204  in the optical lens plate  200  may has the same design, a single optical lens  204  is taken as an example for description.  FIG. 4  is a luminous intensity distribution curve of an embodiment of the optical lens in  FIG. 2A . In  FIG. 4 , the center of a circle is a position where a light source (the LED  54 ) is located, a concentric arc  40  represents two thirds of a maximum light intensity  42  of the light  60  on a second plane (that is, an X-Z plane) after the light  60  passes through the optical lens  204 , and radial lines represent an angle with a vertical line  44  passing through the light source (for example, 0, 10, 20, 30, 40, 50, 60, 70, 80, and 90 degrees in  FIG. 4 ). A first refraction angle  92  is an angle between a line connecting the center of the circle with a maximum luminous intensity at the right side of the vertical line  44  and another line connecting the center of the circle with a maximum luminous intensity at the left side of the vertical line  44  in the light intensity distribution on the first plane (that is, a dotted line in  FIG. 4 , namely, a Y-Z plane), and a second refraction angle  94  is an angle formed by the light intensity distribution of the light  60  on the second plane (that is, a solid line in  FIG. 4 , namely, an X-Z plane) and the concentric arc  40  at the right side of the vertical line  44 , that is, an angle of the luminous intensity distribution on the second plane greater than two thirds of the maximum light intensity  42  at the right side of the vertical line  44 . 
         [0057]    The relative relation among the incident curved surface  206 , the cone-shaped body  208 , and the emitting curved surface  210  may influence the first refraction angle  92  of the light  60  on the first plane (that is, the Y-Z plane) and the second refraction angle  94  of the light  60  on the second plane (that is, the X-Z plane), and the details will be described later. 
         [0058]    Referring to  FIG. 3A , the cone-shaped body  208  comprises a first surface  212  and a second surface  214 , wherein there is a first angle θ 1  between the first surface  212  and the second surface  214 . The first angle θ 1  may be between 10 degrees and 65 degrees (that is, 10° θ 1  65°), so that the light intensity distribution of the light  60  on the second plane (that is, the X-Z plane) is asymmetric.  FIGS. 5A ,  5 B,  5 C,  5 D, and  5 E are luminous intensity distribution curves in which the first angle in  FIG. 3A  is 10 degrees, 25 degrees, 40 degrees, 60 degrees, and 65 degrees respectively. Different first angles θ 1  correspond to different first refraction angles  92  and different second refraction angles  94 , and detailed results are shown in Table 1. 
         [0000]    
       
         
               
               
               
             
           
               
                 TABLE 1 
               
               
                   
               
               
                 First angle 
                 First refraction angle 
                 Second refraction angle 
               
               
                 (degrees) 
                 (degrees) 
                 (degrees) 
               
               
                   
               
             
             
               
                 10 
                 115 
                 38 
               
               
                 25 
                 115 
                 44 
               
               
                 40 
                 115 
                 46 
               
               
                 60 
                 116 
                 62 
               
               
                 65 
                 116 
                 65 
               
               
                   
               
             
          
         
       
     
         [0059]    It can be known form Table 1 that, when the first angle θ 1  becomes larger, the second refraction angle  94  of the light  60  after the light  60  passes through the optical lens  204  increases accordingly. When the optical lens  204  is applied to a street lamp, since the second refraction angle  94  is the distribution of the light  60  at the road side, an optical lens  204  having a larger first angle θ 1  can project the light  60  to a wider road area. In other words, the optical lens  204  having the larger first angle θ 1  is applicable to a street lamp for multilane roads. 
         [0060]    Moreover, referring to  FIG. 3A , the incident curved surface  206  further comprises a first incident curved surface  216  and a second incident curved surface  218 , wherein the second incident curved surface comprises a first curved line  70 . The first curved line  70  comprises two first end points H and K. There is a second angle θ 2  between a connecting line  72  between the first end points H and K and the second surface  214 . 
         [0061]    The second angle θ 2  may be greater than or equal to 30 degrees and less than or equal to 60 degrees (that is, 30° θ 2  60°), so that the luminous intensity distribution of the light  60  on the second plane (that is, the X-Z plane) is asymmetric.  FIGS. 6A ,  6 B, and  6 C are luminous intensity distribution curves in which the second angle in  FIG. 3A  is 30 degrees, 35 degrees and 60 degrees respectively. Different second angles θ 1  correspond to different first refraction angles  92  and different second refraction angles  94 , and detailed results are shown in Table 2. 
         [0000]    
       
         
               
               
               
             
           
               
                 TABLE 2 
               
               
                   
               
               
                 Second angle 
                 First refraction angle 
                 Second refraction angle 
               
               
                 (degrees) 
                 (degrees) 
                 (degrees) 
               
               
                   
               
             
             
               
                 30 
                 114 
                 45 
               
               
                 35 
                 115 
                 43 
               
               
                 60 
                 114 
                 39 
               
               
                   
               
             
          
         
       
     
         [0062]    It can be known form Table 2 that, when the second angle θ 2  becomes larger, the second refraction angle  94  of the light  60  after the light  60  passes through the optical lens  204  decreases accordingly. When the optical lens  204  is applied to a street lamp, since the second refraction angle  94  is the luminous intensity distribution of the light  60  at the road side, an optical lens  204  having a smaller second angle θ 1  can project the light  60  to a wider road area. In other words, the optical lens  204  having the smaller second angle θ 1  is applicable to the street lamp for multilane roads. 
         [0063]    Referring to  FIG. 3B , the optical lens  204  further comprises a lead angle surface  220 . In this embodiment, the lead angle surface  220  may be a plane, so that after passing through the lead angle surface  220 , the large-angle light  60  (for example, the light  60  with an angle between the light  60  and the first optical axis  56  of 85-90 degrees) can be emitted out from the optical lens  204  via the emitting curved surface  210 , thereby increasing the utilization of the light  60 , but this embodiment is not intended to limit the present invention, that is, the lead angle surface  220  may also be a curved surface. 
         [0064]    Moreover, the lead angle surface  220  comprises a first line segment  222 , in which the first line segment  222  comprises two second end points J and L. There is a third angle θ 3  between a connecting line  74  between the second end points J and L and the first optical axis  56 . In this embodiment, since the lead angle surface  220  is a plane, the first line segment  222  coincides with the connecting line  74  between the second end points J and L, but this embodiment is not intended to limit the present invention. The third angle θ 3  may be greater than or equal to 20 degrees and less than or equal to 50 degrees (that is, 20° θ 3  50°), so that the light  60  is emitted out from the optical lens  204 , thereby increasing the utilization of the light  60 . Different third angles θ 3  correspond to different relative light utilization, and detailed results are shown in Table 3. 
         [0000]    
       
         
               
               
             
               
               
             
           
               
                 TABLE 3 
               
               
                   
               
               
                 Third angle 
                 Relative light utilization 
               
               
                 (degrees) 
                 (%) 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 0 
                 100 
               
               
                 20 
                 101 
               
               
                 35 
                 102 
               
               
                 50 
                 102.4 
               
               
                   
               
             
          
         
       
     
         [0065]    It can be known form Table 3 that, when the third angle θ 3  becomes larger, the relative utilization of the light  60  after the light  60  passes through the optical lens  204  increases accordingly. 
         [0066]    Furthermore, the relative relation between the incident curved surface  206  and the emitting curved surface  210  influences the range of the first refraction angle  92  of the light  60  on the first plane (that is, the Y-Z plane).  FIGS. 7A ,  7 B, and  7 C are schematic structural views of a first, a second, and a third embodiment of the optical lens of the present invention respectively. It can be found from  FIGS. 7A ,  7 B, and  7 C that, the difference between the three optical lenses lies in different relative distances between the incident curved surface  206  and the emitting curved surface  210 , wherein the relative distance between the incident curved surface  206  and the emitting curved surface  210  in  FIG. 7A  is larger than that in  FIG. 7B , and the relative distance between the incident curved surface  206  and the emitting curved surface  210  in  FIG. 7B  is larger than that in  FIG. 7C . The relative distance is a shortest distance between the incident curved surface  206  and the emitting curved surface  210 . 
         [0067]    The optical lens  204  may influence the luminous intensity distribution of the light  60  after the light  60  passes through the optical lens  204  with the different relative distances between the incident curved surface  206  and the emitting curved surface  210 .  FIGS. 8A ,  8 B, and  8 C are luminous intensity distribution curves of the optical lens in  FIGS. 7A ,  7 B, and  7 C respectively. The optical lenses  204  of the first embodiment, the second embodiment and the third embodiment have different first refraction angles  92  and different second refraction angles  94  respectively, and detailed results are shown in Table 4. 
         [0000]    
       
         
               
               
               
             
               
               
               
             
           
               
                   
                 TABLE 4 
               
               
                   
                   
               
               
                   
                 First refraction angle 
                 Second refraction angle 
               
               
                   
                 (degrees) 
                 (degrees) 
               
               
                   
                   
               
             
             
               
                   
               
             
          
           
               
                 First embodiment 
                 105 
                 42 
               
               
                 Second embodiment 
                 115 
                 43 
               
               
                 Third embodiment 
                 145 
                 44 
               
               
                   
               
             
          
         
       
     
         [0068]    It can be known from Table 4 that, as the relative distance between the incident curved surface  206  and the emitting curved surface  210  decreases, the first refraction angle  92  of the light  60  on the first plane (that is, the Y-Z plane) becomes larger. When the optical lens  204  is applied to a street lamp, since the first refraction angle  92  is the luminous intensity distribution of the light  60  in a length direction of the road, so that an optical lens  204  having a shorter relative distance between the incident curved surface  206  and the emitting curved surface  210  can project the light  60  to a longer road length, so as to increase an interval between two adjacent street lamps arranged in a second axial direction (that is, a Y direction), thereby decreasing the number of the street lamps arranged. 
         [0069]    In the above embodiments, the emitting curved surface  210  is the wlliptical curved surface, but the emitting curved surface  210  may also be an M-shaped curved surface.  FIG. 9  is a schematic structural view of another embodiment in which an optical lens plate of the present invention is applied to a lamp. In this embodiment, the M-shaped curved surface (that is, the emitting curved surface  210 ) comprises a central axis  224 , wherein the central axis may coincide with the first optical axis  56 , but this embodiment is not intended to limit the present invention. 
         [0070]      FIGS. 10A ,  10 B, and  10 C are schematic structural views of a fourth embodiment, a fifth embodiment and a sixth embodiment of the optical lens of the present invention respectively. It can be found from  FIGS. 10A ,  10 B, and  10 C that, the difference between the three optical lenses lies in different relative distances between the incident curved surface  206  and the emitting curved surface  210 , and the emitting curved surfaces  210  in the  FIGS. 10A ,  10 B, and  10 C are the M-shaped curved surfaces. The relative distance is a shortest distance between the incident curved surface  206  and the emitting curved surface  210 . 
         [0071]    The optical lens  204  may influence the luminous intensity distribution of the light  60  after the light  60  passes through the optical lens  204  with the different relative distances between the incident curved surface  206  and the emitting curved surface  210 .  FIGS. 11A ,  11 B, and  11 C are luminous intensity distribution curves of the optical lenses in  FIGS. 10A ,  10 B, and  10 C respectively. The optical lenses  204  of the fourth embodiment, the fifth embodiment, and the sixth embodiment have different first refraction angles  92  and different second refraction angles  94  respectively, and detailed results are shown in Table 5. 
         [0000]    
       
         
               
               
               
             
               
               
               
             
           
               
                   
                 TABLE 5 
               
               
                   
                   
               
               
                   
                 First refraction angle 
                 Second refraction angle 
               
               
                   
                 (degrees) 
                 (degrees) 
               
               
                   
                   
               
             
             
               
                   
               
             
          
           
               
                 Fourth embodiment 
                 105 
                 44 
               
               
                 Fifth embodiment 
                 112 
                 45 
               
               
                 Sixth embodiment 
                 145 
                 47 
               
               
                   
               
             
          
         
       
     
         [0072]    It can be known from Table 5 that, as the relative distance between the incident curved surface  206  and the emitting curved surface  210  decreases, the first refraction angle  92  of the light  60  on the first plane (that is, the Y-Z plane) becomes larger. When the optical lens  204  is applied to a street lamp, since the first refraction angle  92  is the luminous intensity distribution of the light  60  in a length direction of the road, so that an optical lens  204  having a shorter relative distance between the incident curved surface  206  and the emitting curved surface  210  can project the light  60  to a longer road length, so as to increase an interval between two adjacent street lamps arranged in a second axial direction (that is, a Y direction), thereby decreasing the number of the street lamps arranged. 
         [0073]    With the optical lens and the optical lens plate of the present invention, through the design of a first angle, the luminous intensity distribution of light passing through an optical lens on a second plane may be asymmetric. Through the design of a second angle, the luminous intensity distribution of light passing through the optical lens on the second plane may be asymmetric. Through the design of a lead angle surface and a third angle, the utilization of the light increases. Through the adjustment of a relative distance between a incident curved surface and a emitting curved surface, the first refraction angle of the light on the first plane is changed. The optical lens plate of the present invention is applicable to a lamp, wherein an asymmetric luminous intensity distribution is achieved through the design of a single type of optical lens. Therefore, the luminous intensity distribution curve of the light after passing through the optical lens and the optical lens plate of the present invention is asymmetric, and the problems such as light pollution, low light utilization, and high manufacturing cost due to the complex design in the prior art can be solved, when being applied to a street lamp. When the second refraction angle of the optical lens is larger, the optical lens is more applicable in street lamps for multilane road lighting.