KR20210109996A - Optical lens and light emitting module comprising the same - Google Patents

Abstract

Provided is an optical lens diffusing light generated from a light source. The optical lens comprises: a light incidence unit which is concavely formed toward an upper side in a height direction for a light generated from the light source to pass through the center of the lens; a light reflection unit constituted to reflect at least part of the light passed through the light incidence unit from the upper side of the light incidence unit in the height direction; a light emission unit constituted to emit the light, reflected at the light reflection unit, from the outer radial side of the light reflection unit; and a back surface unit which is placed on a circumference of the light incidence unit at the outer radial side of the light incidence unit and has a concave groove toward the upper side in the height direction. The present invention aims to improve diffusion of light by increasing reflected or refracted light amount inside the lens.

Description

Optical lens and light emitting module including the same

The present disclosure relates to an optical lens and a light emitting module including the same. More specifically, it relates to an optical lens installed on an LED panel to control a path of emitted light.

In general, a plurality of light emitting modules are arranged in a backlight unit used in a liquid crystal display (LCD). The light emitting module includes a light emitting device and a diffusion lens, and the light emitting device may use, for example, a light emitting diode (LED, hereinafter referred to as LED). LEDs have advantages of small size and low power consumption, and thus have been widely used as light sources in recent years. Since the light emitted from the LED has a relatively high linearity, a diffusion lens is used to disperse the light emitted from the light emitting device at a wide angle to be emitted. A plurality of light emitting modules may irradiate light to a wide area of the backlight unit through the diffusion lens.

Diffusion lenses are classified into refractive diffusion lenses and reflective diffusion lenses. The refractive diffusion lens has a structure in which light is refracted by forming an exit surface of the lens through which light passes as a curved surface.

Japanese Patent No. 6,294,635 discloses a surface light source device having a surface concavely extending from the central axis to reflect light. Therefore, there is a problem in that it is difficult to implement a sufficient level of light diffusion.

Various embodiments of the present disclosure aim to improve light diffusivity by increasing the amount of light reflected or refracted inside a lens. Another object of the present invention is to provide an optical lens that minimizes occurrence of luminance unevenness and increases the amount of light directed in a lateral direction, and a light emitting module including the same.

In an optical lens for diffusing light generated from a light source according to an embodiment of the present disclosure, the optical lens comprising: a light incident portion concavely formed upward in the height direction so that light generated from the light source is incident at the center of the lens; a light reflection unit configured to reflect at least a portion of light passing through the light incidence unit above the light incidence unit in a height direction; a light output unit configured to emit light reflected from the light reflection unit in a radial direction of the light reflection unit; and a rear surface portion disposed on the periphery of the light incident portion from the radially outer side of the light incident portion to form a groove concave upward in the height direction, wherein the light reflection portion comprises a first reflective portion and a first curved surface concavely extending upwardly in the height direction. It is disposed on the radially outer side of the reflective part and includes a second reflective part extending flatly along the radial direction from the first reflective part, and a micro pattern may be formed on at least a portion of the rear part.

According to an exemplary embodiment, at least a portion of the light reflected by the first reflecting unit may be configured to be emitted to the light output unit after being reflected by the second reflecting unit.

According to an embodiment, the rear surface portion may include: a first rear surface portion concave upwardly in the height direction; and a second rear surface formed between the first rear surface portion and the light incident portion and having a highest height lower than that of the first rear surface portion.

According to an embodiment, the light incident portion may include: a first incident portion extending from a central position of the light incident portion to an inflection point; and a second incident portion having a different curvature from the first incident portion and extending in a radial direction from the inflection point.

According to an embodiment, a micro pattern may be formed on a portion of an edge of the second incident part.

According to an embodiment, the micro pattern may be a micro pattern formed on the second back surface.

According to an embodiment, the first back surface may include: a first partial surface convexly formed upward in the height direction from the bottom surface parallel to the radial direction; a second partial surface extending flatly from the first partial surface; and a third partial surface extending from the second partial surface to the bottom surface.

According to an embodiment, the micro pattern may be a micro pattern formed on the second partial surface.

A light emitting module according to an embodiment of the present disclosure includes a circuit board; a light emitting device mounted on a circuit board; and an optical lens installed on the circuit board to be positioned above the light emitting device and controlling light emitted from the light emitting device.

According to the embodiments of the present disclosure, light diffusivity may be improved by forming the rear surface portion under the optical lens. In addition, by forming the micro pattern on the light incident portion and the back surface of the optical lens, the amount of light directed upward can be reduced and the amount of light directed laterally can be increased.

1 is a perspective view illustrating a light emitting module including an array of optical lenses according to an embodiment of the present disclosure.
2 is a perspective view illustrating a configuration of the optical lens according to an embodiment of the present disclosure as viewed from the image side.
FIG. 3 is a perspective view illustrating the configuration of the optical lens shown in FIG. 2 as viewed from the lower side.
FIG. 4 is a cross-sectional view taken along line II of the optical lens shown in FIG. 2 .
FIG. 5 is a view for explaining an optical path with respect to a light reflection unit of the optical lens shown in FIG. 4 .
FIG. 6 is a view for explaining an optical path with respect to a light incident part of the optical lens shown in FIG. 4 .
FIG. 7 is a view for explaining an optical path with respect to the rear surface of the optical lens shown in FIG. 4 .
8 is a partial cross-sectional view for explaining the configuration of an optical lens according to another embodiment of the present disclosure.
9 is a perspective view for explaining the configuration of an optical lens according to another embodiment of the present disclosure.
10 is a cross-sectional view taken along line II of the optical lens shown in FIG. 9 .
11 is a cross-sectional view of the optical lens shown in FIG. 9 taken along line II-II.
FIG. 12 is a table showing the luminance test results according to the size of the back surface shown in FIG. 8 .
FIG. 13 is a graph showing luminance according to the size of the back surface shown in FIG. 8 .
FIG. 14 is a graph showing relative luminance values according to the size of the back surface shown in FIG. 8 .

Embodiments of the present disclosure are exemplified for the purpose of explaining the technical spirit of the present disclosure. The scope of the rights according to the present disclosure is not limited to the embodiments presented below or specific descriptions of these embodiments.

All technical and scientific terms used in this disclosure have the meanings commonly understood by one of ordinary skill in the art to which this disclosure belongs, unless otherwise defined. All terms used in the present disclosure are selected for the purpose of more clearly describing the present disclosure and not to limit the scope of the present disclosure.

As used in this disclosure, expressions such as "comprising", "including", "having", etc. are open-ended terms connoting the possibility of including other embodiments, unless otherwise stated in the phrase or sentence in which the expression is included. (open-ended terms).

Expressions in the singular described in this disclosure may include plural meanings unless otherwise stated, and the same applies to expressions in the singular in the claims.

Expressions such as “first” and “second” used in the present disclosure are used to distinguish a plurality of components from each other, and do not limit the order or importance of the corresponding components.

In the present disclosure, when a component is referred to as being “connected” or “connected” to another component, the component can be directly connected or connectable to the other component, or a new component It should be understood that other components may be connected or may be connected via other components.

Direction indicators such as “upper” and “upper” used in the present disclosure are based on the direction in which the lens is positioned with respect to the light emitting element in the accompanying drawings, and direction indicators such as “down” and “down” are in the opposite direction means The lens and the light emitting device shown in the accompanying drawings may be oriented differently, and the direction indicators may be interpreted accordingly.

The coordinate system shown in the drawings of the present disclosure shows an X-axis and a Z-axis. The X-axis direction means a direction parallel to the radial direction of the optical lens, and the Z-axis direction means a direction parallel to the height direction of the optical lens. In addition, the radial direction may mean a direction away from the central axis direction of the optical lens.

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In the accompanying drawings, identical or corresponding components are assigned the same reference numerals. In addition, in the description of the embodiments below, overlapping description of the same or corresponding components may be omitted. However, even if description regarding components is omitted, it is not intended that such components are not included in any embodiment.

1 is a perspective view illustrating a light emitting module 1000 including an array of optical lenses according to an embodiment of the present disclosure.

A backlight unit (not shown) is disposed at the rear of the liquid crystal display device (not shown), and irradiates light toward the front of the liquid crystal display device, thereby realizing an identifiable image on the display device. The light emitting module 1000 included as a component of a backlight unit (not shown) may include an optical lens 100 , a light emitting device 10 , and a printed circuit board (PCB, 30 ).

The light emitting device 10 may be mounted on the circuit board 30 , and the circuit board 30 may be configured to control the light emitting device 10 and supply power to the light emitting device 10 . The light emitting device 10 may be composed of, for example, an LED lamp. In order to control and diffuse the light emitted from the light emitting device 10 , the optical lens 100 may be installed on the circuit board 30 to be positioned above the light emitting device 10 .

In FIG. 1 , a plurality of light emitting devices 10 may be mounted in a checkerboard-shaped array so as to have a constant distance from each other on a circuit board 30 having an area of a predetermined size. The optical lens 100 may be provided in a number corresponding to the number of the plurality of light emitting devices 10 , and installed on the circuit board 30 to be positioned above each light emitting device 10 .

A bonding portion 170 may be formed on the bottom surface 101 of the optical lens 100 . The bonding unit 170 may be bonded to the position display unit 20 formed on the circuit board 30 . A plurality of bonding portions 170 may be provided in an edge region of the bottom surface 101 .

2 is a perspective view illustrating a configuration of the optical lens 100 as viewed from the upper side according to an embodiment of the present disclosure. FIG. 3 is a perspective view illustrating the configuration of the optical lens 100 shown in FIG. 2 as viewed from the lower side. 4 is a cross-sectional view taken along the line I-I of the optical lens 100 shown in FIG. 2 .

2 and 3 , the optical lens 100 may include a light incidence unit 110 , a light reflection unit 120 , a rear surface 130 , and a light emission unit 160 . Referring to FIG. 4 , the optical lens 100 may have a symmetrical shape with respect to the central axis CL. In addition, the optical lens 100 may have a columnar shape in which the height direction (Z direction) is the central axis as a whole. That is, when the optical lens 100 is cut in a plane perpendicular to the Z-axis, a cross-section having sides composed of four convex curves as a whole may appear.

The light incident part 110 may be formed to be concave upward in the height direction (Z direction) so that the light emitted from the light emitting device 10 is incident. The light incident part 110 may have a conical shape as a whole. The conical surface forming the conical shape may be configured as a curved surface convex downward in the height direction (Z direction). A detailed configuration of the light incident unit 110 will be described later.

The light exit unit 160 may include an exit surface 161 through which light passing through the light incidence unit 110 or refracted by the light incidence unit 110 exits to the outside of the optical lens 100 . The emission surface 161 may be configured as a curved surface convex in the radial direction RD. A flange portion 180 may be formed below the light emission portion 160 . The flange portion 180 does not substantially affect the light path.

The light reflection unit 120 formed on the upper side in the height direction (Z direction) of the optical lens 100 is formed to be concave toward the lower side in the height direction (Z direction) so that a portion of the light passing through the light incident unit 110 is reflected. The first and second reflection units 121 and 122 may be formed. The first reflection unit 121 may be configured as a curved surface concavely extending from a position spaced upward in the height direction (Z direction) from the central position of the light incident unit 110 . The first reflector 121 may have a substantially truncated cone shape. That is, the optical lens 100 may have a shape that is recessed from the top to the bottom.

The first reflector 121 may be formed to be tapered in the direction of the central axis CL of the optical lens 100 , and the second reflector 122 may be formed in a radial direction from the first reflector 121 . It may extend flat to parallel with (RD). The second reflector 122 may be formed of a flat surface (see FIG. 4 ), but is not limited thereto, and may be formed of an angled surface (see FIG. 8 ). Unlike the first reflector 121 , the second reflector 122 is formed to have a flat surface, which may improve brightness in the central axis direction of the optical lens 100 . On the other hand, it is obvious that the second reflection unit 122 may be formed with a predetermined curvature capable of improving the brightness in the central axis CL direction in the optical lens 100 in addition to the flat surface. A portion of the light passing through the light incident unit 110 may be reflected by the first reflection unit 121 or the second reflection unit 122 to be emitted through the emission surface 161 .

The back surface part 130 is formed outside the radial direction RD of the light incident part 110 and is configured to change the path of the light passing through the light incident part 110 or the path of the light reflected by the light reflecting part 120 . can be The back surface 130 may form a groove concave upward in the height direction (Z direction) from the radially outer side of the light incident unit 110 . The back side 130 may include a first back side 140 and a second back side 150 . The second back surface part 150 is formed between the first back surface part 140 and the light incident part 110 and may have a lower maximum height than the first back surface part 140 .

Referring to FIG. 4 , when the cross-section of the optical lens 100 is viewed, the first rear surface portion 140 and the second rear surface portion 150 may have a cross section of a generally triangular or rhombus shape. The first back surface portion 140 has a first partial surface 141 convexly formed upward in the height direction (Z direction) from the bottom surface 101 parallel to the radial direction RD, and is flat from the first partial surface 141 . The second partial surface 142 may include an extended third partial surface 143 and a third partial surface 143 extending downward from the second partial surface 142 to the bottom surface 101 in the height direction (Z direction). The first partial surface 141 may be formed to be connected to the second back surface portion 150 .

FIG. 5 is a view for explaining an optical path with respect to the light reflection unit 120 of the optical lens 100 shown in FIG. 4 .

The light L1 is reflected by the first reflector 121 and then displays the light emitted through the emitting surface 161 . In general, the light L1 may be a light having an angle with respect to the central axis CL within about 45°. Since the light L1 is directed upward in the height direction (Z direction) while passing through the emission surface 161 , a structure of the second reflection unit 122 may be provided to further increase light diffusivity.

The light L2 is a part of the light reflected by the first reflection unit 121 , and is configured to be emitted to the light output unit after being reflected by the second reflection unit 122 . The light L2 may be composed of light having an angle of approximately 45° or more with respect to the central axis CL. Since the light L2 is directed downward in the height direction (Z direction) after being reflected by the second reflection unit 122 , light diffusivity may be further improved.

FIG. 6 is a view for explaining an optical path with respect to the light incident unit 110 of the optical lens 100 shown in FIG. 4 . Lights L3, L4, and L5 shown in FIG. 6 represent the same lights as lights L3, L4, and L5 shown in FIG.

The light incident part 110 has a curvature different from that of the first incident part 111 and the first incident part 111 extending from the central axis CL to a point of inflection PI, and is formed from the inflection point PI. A second incident part 112 extending in the radial direction RD may be included. A micro pattern may be formed on a portion 113 of an edge of the second incident part 112 .

The light L3 is reflected by the second incident unit 112 and is directed downward in the height direction (Z direction). If the light emitted from the light emitting device 10 is directed toward the first incident portion 111 , since the incident angle is smaller than the total reflection angle, the light may pass through the first incident portion 111 rather than being reflected.

The light L4 represents light passing through the edge portion 113 on which the micro-pattern is formed. Since the micro-pattern is formed on the edge portion 113 , the amount of light passing through the light L4 may be greater than being reflected on the edge portion 113 , and may be refracted at various angles to spread the light. Accordingly, light diffusivity may be improved due to such a micropattern.

The light L5 is reflected by the second back surface 150 and is directed downward in the height direction (Z direction). The light L5 passes through the light incident unit 110 and is directed to the second rear surface portion 150, and the incident angle of the light L5 corresponds to an angle that is generally totally reflected by the second rear surface portion 150, so that the second It may be reflected by the second back surface portion 150 rather than passing through the second rear surface portion 150 . Meanwhile, a micro pattern may be formed on the second back surface 150 . In this case, since the angle of the light L5 directed downward in the height direction (Z direction) after being reflected by the second back surface part 150 may be more variously dispersed, light diffusivity may be improved.

FIG. 7 is a view for explaining an optical path with respect to the rear surface portion 130 of the optical lens 100 shown in FIG. 4 . FIG. 7 mainly describes the optical path for the first back surface 140 .

The first back surface portion 140 is formed generally from the first partial surface 141 and the first partial surface 141 convexly formed upward in the height direction (Z direction) from the bottom surface 101 parallel to the radial direction RD. It may include a second partial surface 142 extending flatly, and a third partial surface 143 extending from the second partial surface 142 to the bottom surface 101 . Meanwhile, the second partial surface 142 may be formed to be inclined at a predetermined angle with the bottom surface 101 . A micro pattern may be formed on the second partial surface 142 .

The light L6 represents light that is refracted while passing through the first back surface portion 140 . The light L6 may be refracted while passing through the first partial surface 141 , and then refracted while passing through the third partial surface 143 . If the micro-pattern is not formed on the edge portion 113 of the light incident part 110 , the light L6 may be reflected on the bottom surface 101 , and light diffusivity may be weakened. Accordingly, when the micro-pattern is formed on the edge portion 113 of the light incident part 110 , the light L6 passing through the first partial surface 141 may be generated, and light diffusivity may be improved.

The light L7 represents light reflected while passing through the first back surface portion 140 . The light L7 may have a smaller angle with the central axis CL than the light L6 . The light L7 may first pass through the first partial surface 141 and then be reflected on the second partial surface 142 . Next, the light L4 may be directed downward in the height direction (Z direction) after being reflected on the third partial surface 143 . Accordingly, since the light L7 may be the light directed toward the light emitting device 10 again, light diffusivity may be improved. If the micro-pattern is formed on the second partial surface 142 , the angle at which the light L7 spreads on the second partial surface 142 may be varied, so that light diffusivity may be improved.

8 is a partial cross-sectional view for explaining the configuration of the optical lens 100 according to another embodiment of the present disclosure. A duplicate description of the configuration described in the above-described embodiment will be omitted. Part A is an enlarged portion of an upper edge of the optical lens 100 , and Part B is an enlarged portion of a lower edge of the optical lens 100 .

The second reflector 123 may be formed of at least one inclined surface forming a predetermined angle with the radial direction RD. In this case, the second reflector 123 may constitute a pattern in which the inclined surface is repeated. If the light is reflected by the second reflector 123 having a pattern, the angle after being reflected by the second reflector 123 may be dispersed, so that light diffusivity may be improved. Meanwhile, the second reflection unit 123 may be configured as a flat surface as shown in FIG. 4 .

The average line AL and the radial direction RD formed by the second reflector 123 may form a predetermined angle α. The predetermined angle α may be, for example, between 1° and 5°. In this case, since the amount of light directed downward in the height direction (Z direction) can be increased, light diffusivity can be improved.

A stepped surface 162 may be formed between the exit surface 161 and the flange portion 180 . The stepped surface 162 may be formed to have a curvature different from that of the exit surface 161 . Accordingly, since the degree of refraction of the light passing through the emitting surface 161 and the light passing through the stepped surface 162 is different, light diffusivity may be improved.

9 is a perspective view for explaining the configuration of the optical lens 200 according to another embodiment of the present disclosure. 10 is a cross-sectional view of the optical lens 200 shown in FIG. 9 taken along line I-I. 11 is a cross-sectional view of the optical lens 200 shown in FIG. 9 taken along line II-II. A duplicate description of the configuration described in the above-described embodiment will be omitted.

The optical lens 200 may include a light incidence unit 210 , a light reflection unit 220 , a rear surface unit 230 , and a light emission unit 260 . The light reflection unit 210 may include a first reflection unit 221 and a second reflection unit 222 . When viewed from the top, the light reflection unit 210 may have a rectangular shape with curved corners. Also, the first reflective part 221 may have a circular shape, and the second reflective part 221 may include four partial surfaces obtained by removing the circular shape from the rectangular shape. Each partial surface may have a curved side (ie, a plurality of arc lines).

Compared with the light reflection unit 120 illustrated in FIG. 2 , the diameter of the first reflection unit 221 illustrated in FIG. 9 is larger than the diameter of the first reflection portion 121 illustrated in FIG. 2 . Accordingly, the edge of the first reflection unit 221 may almost come into contact with the edge of the light reflection unit 210 . Accordingly, the area of the second reflection unit 222 illustrated in FIG. 9 is significantly smaller than the area of the second reflection unit 122 illustrated in FIG. 2 .

Since FIG. 10 is a cross-sectional view of the optical lens 200 shown in FIG. 9 taken along line I-I, the second reflection unit 222 is not shown in FIG. On the other hand, since FIG. 11 is a cross-sectional view of the optical lens 200 shown in FIG. 9 taken along line II-II, the second reflection unit 222 is shown in FIG. 11 . The second reflector 222 may extend flatly from the first reflector 221 . The second reflection unit 222 may be formed of a flat surface, but is not limited thereto, and may be formed of an angled surface (see FIG. 8 ).

FIG. 12 is a table showing results of a luminance experiment according to the size of the back surface 130 shown in FIG. 8 . 13 is a graph showing luminance according to the size of the back surface 130 shown in FIG. 8 . FIG. 14 is a graph showing relative luminance values according to the size of the back surface 130 shown in FIG. 8 . In FIG. 10 , the X axis indicates a position along the radial direction RD of the optical lens 100 , and the Y axis indicates different luminance values at the corresponding position. In addition, the X-axis represents the position along the radial direction RD of the optical lens 100, and the Y-axis represents the ratio (%) of the luminance value corresponding to each position divided by the maximum luminance value.

Referring to FIG. 8 , the height H of the optical lens 100 may be defined as the shortest distance between the second reflector 123 and the bottom surface 101 . In addition, the thickness T of the first back surface portion 140 may be defined as the shortest distance between the highest point of the first back surface portion 140 and the second reflection portion 123 . That is, as the thickness T increases, the highest point of the first back surface portion 140 is low, and as the thickness T decreases, the highest point of the first back surface portion 140 is high.

Referring to FIG. 12 , the luminance test results according to Experimental Examples 1 to 11 are described. In the course of the experiment, the height (H) was fixed at 2.95 mm. The first column indicates the number (No.) of the experimental examples. The second column shows experimental examples distinguished from among Experimental Examples 1 to 11. The third column shows the thickness (T) value. The fourth column shows the ratio T/H of the height (H) to the thickness (T) in %. The fifth column shows the maximum luminance Lv at the central axis CL position according to each thickness T. Column 6 shows judgment results according to the experimental results of each of the experimental examples. The unit of the maximum luminance (Lv) may be expressed as Nit. Here, the lower the maximum luminance Lv, the better the light diffusivity, and the higher the maximum luminance Lv, the lower the light diffusivity.

Experimental Examples 1 and 2 were judged to be NG, which means unsuitable for implementation. In Experimental Example 1, the luminance uniformity was not good, and the area where the light was concentrated was wide. In addition, in Experimental Example 2, although a lot of total reflected outgoing rays appeared, the amount of light toward the central axis CL of the optical lens 100 was large.

Experimental Examples 10 and 11 were judged to be NG, meaning unsuitable for implementation. In Experimental Example 10, the total reflected outgoing light was small, but the amount of light toward the central axis CL of the optical lens 100 was also low. In addition, in the experiment 11, it was confirmed that the light diffusivity and light efficiency were inferior.

Experimental Examples 3 to 9 were judged as OK, meaning that they were suitable for implementation. Experimental Example 3 shows UPPER LIMIT, and Experimental Example 9 shows LOWER LIMIT. Therefore, all of Experimental Examples 3 to 9 were judged to be OK. Therefore, it is preferable to perform the thickness (T) of the optical lens 100 between 1.10mm to 2.30mm. Among these, the most preferable experimental example is Experimental Example 6, in which the thickness T is 1.7 mm. In this case, the maximum luminance (Lv) was measured to be 11,984Nit.

Referring to FIG. 13 , a graph displayed between two straight lines parallel to the X axis shows Experimental Examples 3 to 9 . Referring to FIGS. 13 and 14 , it can be seen that the light diffusivity in Experimental Examples 3 to 9 is better implemented than in the other Experimental Examples.

Although the technical spirit of the present disclosure has been described by the examples shown in some embodiments and the accompanying drawings, it does not depart from the technical spirit and scope of the present disclosure that can be understood by those of ordinary skill in the art to which the present disclosure belongs. It should be understood that various substitutions, modifications, and alterations within the scope may be made. Further, such substitutions, modifications and variations are intended to fall within the scope of the appended claims.

10: light emitting element
20: position display unit
30: circuit board
100: optical lens
110: light incident part
120: light reflection unit
130: back side
140: first back surface
150: second back surface
160: light output unit
1000: light emitting module

Claims (9)

In the optical lens for diffusing the light generated from the light source,
a light incident part concave upward in the height direction so that the light generated from the light source is incident at the center of the lens;
a light reflection unit configured to reflect at least a portion of the light passing through the light incidence unit above the light incidence unit in the height direction;
a light output unit configured to emit the light reflected by the light reflection unit from the radially outer side of the light reflection unit; and
and a rear surface portion disposed on the periphery of the light incident portion from the radially outer side of the light incident portion to form a groove concave upward in the height direction;
The light reflection unit includes a first reflection unit formed of a curved surface concavely extending upwardly in the height direction, and a second reflection unit disposed radially outside the first reflection unit and extending flatly in the radial direction from the first reflection unit. including wealth,
A micro pattern is formed on at least a portion of the back surface portion,
optical lens. According to claim 1,
at least a portion of the light reflected by the first reflector is configured to be emitted to the light output unit after being reflected by the second reflector,
optical lens. According to claim 1,
The back side is
a first rear surface concavely formed upward in the height direction; and
a second rear surface formed between the first rear surface portion and the light incident portion and having a highest height lower than the first rear surface portion;
optical lens. According to claim 1,
The light incident part,
a first incident portion extending from a central position of the light incident portion to an inflection point; and
a second incident portion having a different curvature than the first incident portion and extending along the radial direction from the inflection point;
optical lens. 5. The method of claim 4,
A micro pattern is formed on a portion of the edge of the second incident part,
optical lens. 4. The method of claim 3,
The micro pattern is a micro pattern formed on the second back surface portion,
optical lens. 4. The method of claim 3,
The first back surface portion,
a first partial surface convexly formed upward in the height direction from the bottom surface parallel to the radial direction;
a second partial surface extending flatly from the first partial surface; and
a third partial surface extending from the second partial surface to the bottom surface;
optical lens. 8. The method of claim 7,
The micro pattern is a micro pattern formed on the second partial surface,
optical lens. circuit board;
a light emitting device mounted on the circuit board; and
A light emitting module comprising the optical lens of any one of claims 1 to 8 installed on the circuit board so as to be positioned above the light emitting device and controlling the light emitted from the light emitting device.

Images