CN111928203A - Optical lens and light-emitting device - Google Patents

Abstract

The present invention provides an optical lens and a light-emitting device, comprising: a light incident surface, wherein a cavity with an opening is formed on the light incidence surface, the cavity includes a first area and a second area, and the second area is located in the on the first area; the first area is used to place a light source, and the light emitted by the light source is incident from the second area; the light exit surface includes a concave part, the concave part is located on the concave, so The center line of the cavity and the recessed portion coincides with the center line of the optical lens; a bottom surface, the bottom surface connects the light incident surface and the light exit surface; wherein, the bottom surface includes at least one A curved surface, the bottom surface includes at least one concave area; part of the light rays are reflected from the light exit surface and then face the concave area to be refracted to form refracted rays. The optical lens proposed by the present invention can improve the uniformity of the light spot.

Description

Optical lens and light-emitting device

technical field

The present invention relates to the field of optical technology, and in particular, to an optical lens and a light-emitting device.

Background technique

With the development of semiconductor lighting technology, light emitting diodes (Light emitting diodes, LEDs) have been continuously improved in light efficiency, and are now gradually replacing traditional light sources. For the LED light source, how to effectively distribute the light energy emitted by the LED is a key problem to be solved in the design of the optical system using the LED light source. The light emitting uniformity of the current LED light source is not good. In order to achieve more uniform illumination, the light emitted by the LED light source needs to be adjusted. Therefore, it is necessary to provide an optical lens that can improve the uniformity of light output from the light source.

SUMMARY OF THE INVENTION

In view of the above-mentioned defects of the prior art, the present invention proposes an optical lens and a light-emitting device, so as to improve the utilization rate of the light source and the uniformity of light output.

In order to achieve the above object, the present invention provides an optical lens, comprising:

a light incident surface, the light incident surface forms a cavity with an opening, the cavity includes a first area and a second area, the second area is located on the first area; the first area is used for placing a light source, the light emitted by the light source is incident from the second region;

The light exit surface includes a concave portion, the concave portion is located on the concave cavity, and the center line of the concave cavity and the concave portion coincides with the center line of the optical lens;

a bottom surface, the bottom surface connects the light incident surface and the light exit surface;

Wherein, the bottom surface includes at least one curved surface, and the bottom surface includes at least one concave area; part of the light rays are reflected from the light exit surface toward the concave area, and are refracted to form refracted rays.

Further, the optical lens is located on the substrate whose surface is coated with a reflective material, and the refracted light is reflected by the reflective material toward the concave area.

Further, when the bottom surface is a curved surface, the radius of curvature of the bottom surface is less than (R ² +d ² )/8d, where R represents the half width of the bottom surface, and d represents the reflective material to The height of the upper surface of the first region.

且r×N≤R≤r×(N+1)；Further, when the bottom surface includes N curved surfaces, the N curved surfaces are connected to each other and have the same shape; the maximum value of the radius of curvature of the curved surfaces is

And r×N≤R≤r×(N+1);

Wherein, N≧2, R represents the half width of the bottom surface, and d represents the height of the reflective material to the upper surface of the first region.

Further, when the bottom surface includes N curved surfaces, the N curved surfaces have the same shape, and the N curved surfaces are separated by plane intervals, and the maximum value of the curvature radius of the curved surfaces is

Wherein, N≧2, R represents the half width of the bottom surface, d represents the height of the reflective material to the upper surface of the first region, and m represents the width of the plane.

Further, when the bottom surface includes N curved surfaces, the N curved surfaces have different shapes, and the N curved surfaces are separated by plane intervals, and the maximum value of the curvature radius of the curved surfaces is

Wherein, N≥2, R represents the half width of the bottom surface, d represents the height of the reflective material to the upper surface of the first region, m represents the width of the plane, and α represents the smallest curved surface among the N curved surfaces The corresponding central angle, β represents the central angle corresponding to the largest surface among the N surfaces, and r ₁ represents the radius of the smallest surface among the N surfaces.

Further, the ratio of the height of the recess to the distance from the second end to the center point of the recess is between 3-6.

Further, the light exit surface further includes a protruding portion and a vertical portion, and the protruding portion is connected to the outer periphery of the recessed portion.

Further, the distance from the highest point of the protruding portion to the center point of the concave portion is between 0.5-0.8 mm.

Further, the vertical portion is parallel to the center line of the optical lens, the vertical portion is connected to the outer periphery of the protruding portion, and the protruding portion is connected to the bottom surface through the vertical portion.

Further, the height of the first area is smaller than the height of the second area.

Further, the height of the vertical portion is smaller than the height of the cavity.

Further, the present invention also provides a light-emitting device, comprising:

substrate;

a light source, arranged on the substrate;

an optical lens on the light source;

Wherein, the optical lens includes:

a light incident surface, the light incident surface forms a cavity with an opening, the cavity includes a first area and a second area, the second area is located on the first area; the first area is used for placing a light source, the light emitted by the light source is incident from the second region;

The light exit surface includes a concave portion, the concave portion is located on the concave cavity, and the center line of the concave cavity and the concave portion coincides with the center line of the optical lens;

a bottom surface, the bottom surface connects the light incident surface and the light exit surface;

Wherein, the bottom surface includes at least one curved surface, and the bottom surface includes at least one concave area; part of the light rays are reflected from the light exit surface toward the concave area, and are refracted to form refracted rays.

To sum up, the present invention provides an optical lens and a light-emitting device. By designing the bottom surface to include at least one curved surface, at least one concave area is formed on the bottom surface. When the light emitted by the light source is reflected by the light emitting surface, it is refracted through the concave area again to form a refracted light. The refracted light is reflected by the reflective material and then passes through the concave area again. Therefore, the concave area can play a role in diffusing the light. That is, it controls the light. Therefore, the optical lens can improve the uniformity of the light spot formed on the target plane, thereby also improving the utilization rate of the light source.

Description of drawings

FIG. 1 is an overall view of the optical lens proposed in this embodiment.

Figure 2: A partial view of Figure 1.

Figure 3: Sectional view of Figure 1 .

Figure 4: Schematic diagram of the location of the light source and the first region.

Figure 5: Diagram of light rays exiting the light exit surface.

Figure 6: Graph of light reflected from the light exit surface.

Figure 7: Schematic illustration of the regulation of light by the bottom surface.

Figure 8: The bottom surface is a comparison chart of the spot brightness curves of the flat and curved surfaces.

Figure 9: Brief schematic of the array light source.

Figure 10: Simulation comparison diagram of the array light source.

FIG. 11 is a cross-sectional view of the optical lens proposed in this embodiment.

FIG. 12 is another cross-sectional view of the optical lens proposed in this embodiment.

FIG. 13 is another cross-sectional view of the optical lens proposed in this embodiment.

FIG. 14 is a schematic diagram of the light-emitting device proposed in this embodiment.

Detailed ways

The embodiments of the present invention are described below through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

It should be noted that the drawings provided in this embodiment are only to illustrate the basic concept of the present invention in a schematic way, so the drawings only show the components related to the present invention rather than the number, shape and the number of components in actual implementation. For dimension drawing, the type, quantity and proportion of each component can be changed at will in actual implementation, and the component layout may also be more complicated.

As shown in FIGS. 1-2 , this embodiment provides an optical lens 100 , and the optical lens 100 includes a light incident surface 101 , a light exit surface 102 and a bottom surface 103 . The optical lens 100 is a rotationally symmetric structure with an axis of symmetry. The light incident surface 101 forms a cavity with an opening, so that the light source can be placed in the cavity. The light emitted by the light source may enter from the light incident surface 101 and then exit from the light exit surface 102 .

As shown in FIG. 1-FIG. 2, FIG. 2 is a partial three-dimensional view of the optical lens. In this embodiment, the light exit surface 102 is located on the light entrance surface 101, and the bottom surface 103 extends from the light exit surface 102 and is connected to the light exit surface 102. The incident surface 101 is connected. In this embodiment, the bottom surface 103 is a curved surface, and the bottom surface 103 is concave in the direction of the light exit surface 102 , that is to say, the bottom surface 103 is concave toward the inside of the optical lens 100 , so the bottom surface 103 can form a concave shape area.

As shown in FIGS. 1-3 , FIG. 3 is a cross-sectional view of FIG. 1 . In this embodiment, the optical lens 100 includes a center line 100 a, and the center line 100 a can also be used as the rotation axis of the optical lens 100 . The light incident surface 101 includes a first surface 101a and a second surface 101b, and the second surface 101b is located on the first surface 101a. The first surface 101a is a vertical surface, the second surface 101b is a curved surface, and the second surface 101b may be a free-form surface. After the centerline 100a is rotated, the first surface 101a forms the first area 11, the second surface 101b forms the second area 12, and the second area 12 is located on the first area 11. In this embodiment, the first area 11 and the second area are 12 is defined as pocket 10 . In this embodiment, since the first surface 101a is a vertical surface, the first region 11 is cylindrical, and thus the inner diameter of the first region 11 remains unchanged. Since the second surface 101b is a curved surface, the inner diameter of the second region 12 varies. The inner diameter of the second area 12 gradually decreases from the first end to the second end, the end of the second area 12 in contact with the first area 11 can be defined as the first end, and the end of the second area 12 away from the first area 11 is defined as The second end; meanwhile, the second end can also be defined as the highest point of the second region 12 . In this embodiment, the inner diameter of the first region 11 is less than 3.6 mm, for example, 3.18 mm, so the maximum inner diameter of the second region 12 is 3.18 mm, which is the inner diameter of the first end, and the minimum inner diameter of the second region 12 is 0 , that is, the second end; that is, the inner diameter of the second region 12 gradually decreases from 3.18 mm to 0.

As shown in FIGS. 3 and 4 , in this embodiment, the light source 105 is placed in the first area 11 , so the height D of the first area 11 can also be defined as the thickness of the light source 105 , that is to say, the light source 105 is arranged in the first area 105 . The connecting surface of the region 11 and the second region 12 . It can be seen from FIG. 1 that the first area 11 and the second area 12 are connected, so the first end of the second area 12 can be defined as the connection surface of the first area 11 and the second area 12 . When the light source 105 is placed in the first area 11 , the light L emitted by the light source 105 is emitted from the connecting surface and incident from the second area 12 .

As shown in FIG. 3 , in this embodiment, the light exit surface 102 is an aspheric surface symmetrical to the center line 100 a. The light exit surface 102 includes a concave portion 1021 , a protruding portion 1022 and a vertical portion 1023 . The concave portion 1021 is located in the center of the light exit surface 102, that is, in the center of the optical lens 100, and the concave portion 1021 is located directly above the cavity 10, that is to say, the center line connecting the concave portion 1021 and the cavity 10 coincides with the center line 100a . In this embodiment, the height of the concave portion 1021 is A, that is, the distance from the highest point of the protruding portion 1022 to the center point of the concave portion 1021 is A. In this embodiment, the height of the recessed portion 1021 may be between 0.5-0.8 mm, for example, 0.64 mm.

As shown in FIG. 3 , in this embodiment, the protruding portion 1022 is located on the outer periphery of the recessed portion 1021 , and the protruding portion 1022 is also symmetrical about the center line 100 a. The point where the convex part 1022 contacts the concave part 1021 can be defined as the highest point of the optical lens 100 , that is, the corresponding point with the maximum distance from any point of the light exit surface 102 along the centerline 100 a direction to the light entrance surface 101 or the bottom surface 103 . Location. Meanwhile, the distance from the position to the center line 100 a may be defined as the maximum diameter Rmax of the recessed portion 1021 , and the maximum diameter Rmax of the recessed portion 1021 may be greater than the height A of the recessed portion 1021 .

As shown in FIG. 3 , in this embodiment, the vertical portion 1023 is located on the outer periphery of the protruding portion 1022 , and the vertical portion 1023 connects the bottom surface 103 and the protruding portion 1022 . The vertical portion 1023 is parallel or substantially parallel to the center line 100 a, and the height of the vertical portion 1023 is smaller than the height of the cavity 10 .

As shown in FIG. 3 , in this embodiment, the bottom surface 103 is a curved surface. Specifically, the bottom surface 103 is concave toward the light exit surface 102 , that is to say, the bottom surface 103 is concave toward the inside of the optical lens 100 . The surface 103 rotates around the center line 100 a to form a concave area; one end of the concave area is connected to the light exit surface 102 , and the other end of the concave area is connected to the light incident surface 101 . As can be seen from the figure, the cavity 10 is located at the center of the bottom surface 103, that is, at the center of the concave area. Therefore, it can also be said that one end of the concave area is connected to the vertical portion 1023, and the other end of the concave area is connected to the vertical portion 1023. Connection pocket 10. The bottom surface 103 may be a free-form surface or a surface with a constant curvature radius.

As shown in FIG. 3 , in this embodiment, since the second surface 101 b is an arc surface, the second area 12 is a paraboloid with an opening facing the first area 11 , so the second area 12 has the highest point. In this embodiment, the distance B is defined as the distance from the highest point of the second region 12 to the center point of the recessed portion 1021 . The height of the cavity 10 is equal to the sum of the height of the first region 11 and the height of the second region 12 . The height of the first area 11 is equal to D, the height of the second area 12 is equal to C, so the height of the cavity 10 is equal to (C+D). In this embodiment, the ratio of the height of the cavity 10 to the distance from the highest point of the second region 12 to the center point of the concave portion 1021 is between 3-6, for example, 4 or 5, that is, (C+D) /B is between 3-6. In this embodiment, the ratio of (C+D)/B may be 4.5, that is, the height of the cavity 10 is 4.5 mm, and the distance from the highest point of the second region 12 to the center point of the recess 1021 is defined as 1 mm.

As shown in FIG. 3 , in this embodiment, since the bottom surface 103 is a curved surface, the radius of curvature of the bottom surface 103 is related to the height d from the top surface of the first region 11 to the substrate 106 and the half-width R of the bottom surface 103 , so After calculation, the maximum value of the radius of curvature of the bottom surface 103 is equal to (R ² +d ² )/8d, so the radius of curvature of the bottom surface 103 is greater than 0 and less than (R ² +d ² )/8d. It should be noted that the optical lens 100 is mounted on the substrate 106, and the surface of the substrate 106 is coated with a reflective material. In this embodiment, the height from the upper surface of the first region 11 to the substrate 106 is d, that is, the distance from the substrate 106 to the light emitting surface of the light source, or the height from the reflective material to the light emitting surface of the light source is d.

As shown in FIG. 3 , in this embodiment, the outer peripheral contour line 104 of the bottom surface 103 contacts the substrate 106 , so the bottom surface 103 is concave in the direction of the optical lens 100 relative to the PCB substrate. It should be noted that, in this embodiment, the outer peripheral outline 104 is also provided with pins (not shown), so it can contact the substrate 106 .

As shown in FIG. 5 , the light source 105 is first set on the substrate 106 , and the surface of the substrate 106 is coated with a reflective material. The optical lens 100 is then arranged on the light source 105 , ie the light source 105 is located in the cavity 10 . When the light source 105 emits light L, part of the light L enters through the light incident surface 101 and then exits from the light exit surface 102 to form a light spot on the target plane 107 . It should be noted that only one ray L is drawn for illustration in FIG. 5 .

As shown in FIGS. 5 to 6 , in this embodiment, part of the light L exits through the light exit surface 102 , and part of the light L fails to reach the target plane 107 due to the total reflection of the light exit surface 102 , but passes through the bottom surface 103 ejected onto the substrate 106 .

As shown in FIG. 7 , when the light L reaches the substrate 106, since the substrate 106 has a reflective material, the light L is reflected. Since the bottom surface 103 is a curved surface, the bottom surface 103 plays a role in diffusing the light L, so When the light ray L exits through the light exit surface 102 , the light ray L reaches the target plane 107 and is equivalent to being scattered, so the light spot formed on the target plane 107 becomes more uniform.

As shown in FIG. 8 , FIG. 8 is a light spot comparison diagram of the optical lens of the present invention and the conventional optical lens. Wherein, curve 1 is shown as a light spot luminance distribution diagram formed by an optical lens with a flat bottom surface, and curve 2 is shown as a light spot illuminance distribution diagram formed by the optical lens of the present invention. As can be seen from the figure, for an optical lens with a flat bottom surface, when the light is totally reflected to the bottom substrate 106, the reflective material on the substrate 106 reflects the light into the optical lens and converges toward the center, resulting in high brightness in the central area. When the bottom surface of the optical lens is a curved surface, the light reflected by the substrate 106 diverges when passing through the curved surface, thereby reducing the brightness of the central area and improving the uniformity of the light spot.

As shown in FIG. 9 , in this embodiment, four light sources 105 are arranged in a matrix manner, for example, a 2×2 matrix is selected, and the light sources 105 may be light emitting diodes. The spacing between the light sources 105 in the X direction is, for example, 145 mm, and the spacing between the light sources 105 in the Y direction is, for example, 140 mm. The emission angle of the light source 105 may be between 0-180°, eg, 80°. It should be noted that the light sources 105 may be arranged in other matrices, for example, a 3×5 matrix or a 5×8 matrix.

As shown in FIG. 10 , FIG. 10( a ) is an array simulation illuminance diagram of an optical lens with a flat bottom surface, and FIG. 10( b ) is an array simulation illuminance diagram of an optical lens with a curved bottom surface of the present invention. Figures 10(a) and 10(b) both use a 2×2 matrix of light sources. As can be seen from Figure 10(a), since the bottom surface of the optical lens is a plane, when the total reflection light is reflected by the reflective material on the substrate 106 and reaches the bottom plane of the optical lens, the bottom plane of the optical lens will converge the light to the center, resulting in 4 The brightness of the central area of each LED is too high (the brightness of the central area is 6170 nits), and the brightness of the overlapping area between the four LEDs is significantly lower than that of the central area of the LEDs (the brightness of the overlapping area is 4050 nits), with poor uniformity. It can be seen from Fig. 10(b) that after using the optical lens whose bottom surface is a curved surface, when the total reflection light is reflected by the reflective material on the substrate 106 to make the bottom surface curved surface, the bottom curved surface scatters the light to the edge area, which can effectively compensate for The brightness of the overlapping area between the 4 LEDs (the brightness of the overlapping area is 4530nit), which reduces the brightness of the central area of the LED (the brightness of the central area is 5670nit), reduces the brightness difference between the center area and the overlapping area, and improves the uniformity . It should be noted that the bottom surface of the optical lens used in FIG. 10( b ) is a curved surface, and the curvature radius of the bottom surface may be 15.30.

并且，r×N≤R≤r×(N+1)。需要说明的是，R表示底表面103的半宽，d表示基板106至第一区域上表面的高度，也就是反射材料至第一区域上表面的高度。需要说明的是，N可以大于或等于2。As shown in FIG. 11 , this embodiment also proposes another optical lens. The bottom surface 103 of the optical lens is composed of N curved surfaces 103a, the N curved surfaces 103a are connected to each other, and the N curved surfaces 103a have the same shape. The tangents of the N curved surfaces 103 a are dotted lines 108 . In this case, the maximum value of the radius of curvature of the curved surface 103a is

Also, r×N≦R≦r×(N+1). It should be noted that R represents the half width of the bottom surface 103 , and d represents the height from the substrate 106 to the upper surface of the first region, that is, the height from the reflective material to the upper surface of the first region. It should be noted that N can be greater than or equal to 2.

As shown in FIG. 12 , another optical lens is also proposed in this embodiment. The bottom surface 103 of the optical lens includes N curved surfaces 103 a and M flat surfaces 109 , and the N curved surfaces 103 a and M flat surfaces 109 are distributed at intervals. The width of the plane 109 is m, that is, the distance between the curved surfaces 103a is m. In this case, the maximum value of the radius of curvature of the curved surface 103a is

Wherein, R represents the half width of the bottom surface 103, and d represents the height of the reflective material to the upper surface of the first region. It should be noted that N can be greater than or equal to 2. In this embodiment, the difference between the number of curved surfaces and the number of planes is 1, that is to say, the number of curved surfaces can be one more than the number of planes, or the number of curved surfaces can be one less than the number of planes.

其中，R表示底表面103的半宽，d表示基板106至第一区域上表面的高度，也就是反射材料至第一区域上表面的高度，m表示平面109的宽度，α表示第一曲面103b对应的圆心角，β表示第二曲面103c对应的圆心角，r₁表示第一曲面103b的半径。需要说明的是，N可以大于或等于2。α也可以表示所有的曲面中最小的曲面对应的圆心角，β也可以表示所有的曲面中最大的曲面对应的圆心角。As shown in FIG. 13 , this embodiment further proposes another optical lens. The bottom surface 103 of the optical lens is composed of a first curved surface 103 b , a second curved surface 103 c and a flat surface 109 . A plane 109 is spaced between the first curved surface 103b and the second curved surface 103c. The arc of the first curved surface 103b is smaller than that of the second curved surface 103c, that is, the radius of curvature of the first curved surface 103b is smaller than the radius of curvature of the second curved surface 103c. In this case, the maximum value of the radius of curvature of the second curved surface 103c is

Wherein, R represents the half width of the bottom surface 103, d represents the height from the substrate 106 to the upper surface of the first area, that is, the height from the reflective material to the upper surface of the first area, m represents the width of the plane 109, and α represents the first curved surface 103b The corresponding central angle, β represents the central angle corresponding to the second curved surface 103c, and r ₁ represents the radius of the first curved surface 103b. It should be noted that N can be greater than or equal to 2. α can also represent the central angle corresponding to the smallest surface among all the surfaces, and β can also represent the central angle corresponding to the largest surface among all the surfaces.

As shown in FIG. 14 , this embodiment further provides a light-emitting device 200 . The light-emitting device 200 includes a substrate 106 , a light source 105 , and an optical lens 100 .

As shown in FIG. 14 , in this embodiment, the light source 105 is packaged on the substrate 106 , and the substrate 106 is provided with a reflective material. The substrate 106 may be a PCB substrate, and the light source 105 may be an LED. In this embodiment, the light sources 105 may be arranged on the substrate 106 in an M×N matrix, where M may be equal to or not equal to N.

As shown in FIG. 14 , in this embodiment, the optical lens 100 is disposed on the light source 105 , and the specific shape of the optical lens 100 may refer to FIG. 1 , and the shape of the optical lens 100 will not be described here.

As shown in FIG. 14 , in this embodiment, a diffusion film 202 , a first brightness enhancement film 203 and a second brightness enhancement film 204 are further provided on the optical lens 100 . The first brightness enhancement film 203 is located on the diffusion film 202 , and the second brightness enhancement film 204 is located on the first brightness enhancement film 203 . The diffusion film 202, the first brightness enhancement film 203 and the second brightness enhancement film 204 can all play a role in regulating the light spot.

As shown in FIG. 14 , in this embodiment, since the optical lens 100 can regulate the light, the thickness of the light emitting device 200 can be reduced. The light-emitting device 200 can be used in a plurality of electronic devices, for example, in a display device.

To sum up, the present invention provides an optical lens and a light-emitting device. By designing the bottom surface to include at least one curved surface, at least one concave area is formed on the bottom surface. When the light emitted by the light source is reflected by the light emitting surface, it is refracted through the concave area again to form a refracted light. The refracted light is reflected by the reflective material and then passes through the concave area again. Therefore, the concave area can play a role in diffusing the light. That is, it controls the light. Therefore, the optical lens can improve the uniformity of the light spot formed on the target plane, thereby also improving the utilization rate of the light source.

The above description is only a preferred embodiment of the application and an illustration of the applied technical principle. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solution formed by the specific combination of the above technical features , and shall also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept, for example, the above features are similar to those disclosed in this application (but not limited to) A technical solution formed by replacing the technical features of the functions with each other.

Except for the technical features described in the specification, the other technical features are known technologies by those skilled in the art, and in order to highlight the innovative features of the present invention, the remaining technical features are not repeated here.

Claims (10)

1. An optical lens, comprising:

a light incident surface forming a pocket having an opening, the pocket including a first region and a second region, the second region being on the first region; the first area is used for placing a light source, and light rays emitted by the light source are incident from the second area;

the light emitting surface comprises a concave part, the concave part is positioned on the concave cavity, and the center lines of the concave cavity and the concave part are superposed with the center line of the optical lens;

a bottom surface connecting the light incident surface and the light exit surface;

wherein the bottom surface comprises at least one curved surface, and the bottom surface comprises at least one concave area; and part of the light rays are reflected from the light emergent surface and then are refracted towards the concave area to form refracted light rays.

2. The optical lens of claim 1 wherein the optical lens is disposed on a reflective material, and the refracted light rays are reflected by the reflective material toward the concave region.

3. The optical lens of claim 2 wherein when said bottom surface is curved, said bottom surface has a radius of curvature less than (R)²+d²) And/8 d, wherein R represents the half width of the bottom surface, and d represents the height of the reflecting material to the upper surface of the first region.

4. The optical lens of claim 2, wherein when the bottom surface comprises N curved surfaces, the N curved surfaces are connected to each other and have the same shape; maximum value of curvature radius of the curved surface

And R x N is not more than R x (N + 1);

wherein N ≧ 2, R represents a half-width of the bottom surface, and d represents a height of the reflective material to an upper surface of the first region.

5. The optical lens of claim 2 wherein when the bottom surface comprises N curved surfaces, the N curved surfaces have the same shape and the N curved surfaces are separated by a plane, the maximum value of the radius of curvature of the curved surfaces

Wherein N ≧ 2, R represents a half-width of the bottom surface, d represents a height of the reflective material to the upper surface of the first region, and m represents a width of the plane.

6. The optical lens of claim 2 wherein when the bottom surface comprises N curved surfaces, the N curved surfaces have different shapes and the N curved surfaces are separated by a planar space, the maximum of the radius of curvature of the curved surfaces

Wherein N is more than or equal to 2, R represents the half width of the bottom surface, d represents the height from the reflecting material to the upper surface of the first area, m represents the width of the plane, alpha represents the central angle corresponding to the minimum curved surface of the N curved surfaces, beta represents the central angle corresponding to the maximum curved surface of the N curved surfaces, and R represents the central angle corresponding to the maximum curved surface of the N curved surfaces₁Representing the radius of the smallest of the N curved surfaces.

7. The optical lens of claim 1 wherein a ratio of a height of the recess to a distance from the second end to a center point of the recess is between 3-6.

8. An optical lens according to claim 1, characterized in that the distance from the highest point of the protrusion to the center point of the depression is between 0.5 and 0.8 mm.

9. An optical lens according to claim 1, wherein the light exit surface further comprises a convex portion and a vertical portion, the convex portion being connected to an outer periphery of the concave portion; the vertical portion is parallel to a center line of the optical lens, the vertical portion is connected to an outer circumference of the protrusion, and the protrusion is connected to the bottom surface through the vertical portion.

10. A light-emitting device, comprising:

a substrate;

a light source disposed on the substrate;

an optical lens positioned on the light source;

wherein the optical lens includes:

a light incident surface forming a pocket having an opening, the pocket including a first region and a second region, the second region being on the first region; the first area is used for placing a light source, and light rays emitted by the light source are incident from the second area;

the light emitting surface comprises a concave part, the concave part is positioned on the concave cavity, and the center lines of the concave cavity and the concave part are superposed with the center line of the optical lens;

a bottom surface connecting the light incident surface and the light exit surface;

wherein the bottom surface comprises at least one curved surface, and the bottom surface comprises at least one concave area; and part of the light rays are reflected from the light emergent surface and then are refracted towards the concave area to form refracted light rays.

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