KR101573437B1 - Lens for light emitting device package and backlight unit - Google Patents

Abstract

The present invention relates to a lens for a light emitting device package used for display and lighting, and a backlight unit. The lens may include a lens body which has a light entering part formed on a lower surface, a light exiting part formed on an upper surface, and a concave part in the center part of the upper surface; and an internal cavity part which has an empty space sealed between the light entering part of the lens body and the light exiting part to induce at least part of incident light through the light entering part to a lateral direction.

Description

[0001] The present invention relates to a lens and a backlight unit for a light emitting device,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens and a backlight unit for a light-emitting device, and more particularly to a lens and a backlight unit for a light-emitting device which can be used for display or illumination.

A light emitting diode (LED) is a kind of semiconductor device that can emit light of various colors by forming a light emitting source through the formation of a PN diode of a compound semiconductor. Such a light emitting device has a long lifetime, can be reduced in size and weight, and can be driven at a low voltage. In addition, these LEDs are resistant to shock and vibration, do not require preheating time and complicated driving, can be packaged after being mounted on a substrate or lead frame in various forms, so that they can be modularized for various purposes and used as a backlight unit A lighting device, and the like.

Such an LED is mounted on the surface of a circuit board and mounted on various electronic apparatuses. At this time, a lens may be installed on the upper portion of the LED to diffuse the light emitted from the LED.

On the other hand, aphotoconductive material such as a phosphor or a quantum dot is provided on the light emitting device package side separately from the lens, and is subject to thermal damage due to high temperature heat generated in the light emitting device.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a light- , The light direction and light efficiency can be greatly improved and the photoconversion material can be sealed from the outside to firmly protect the photoconversion material from external heat conduction, moisture, foreign matter, etc., And it is an object of the present invention to provide a lens for a light emitting device and a backlight unit which can facilitate alignment of a light emitting device package as well as a phototransducing material to prevent a deviation of a light emitting axis. However, these problems are exemplary and do not limit the scope of the present invention.

According to an aspect of the present invention, there is provided a light emitting device comprising: a lens body having a light-entering portion formed on a lower surface thereof, a light-emitting portion formed on an upper surface thereof, and a concave groove formed in a central portion of the upper surface thereof; And an inner cavity having an empty space in a sealed form between the light-entering portion and the light-emitting portion of the lens body so that at least a part of the light incident through the light-entering portion can be guided laterally .

Further, according to the present invention, the inner cavity portion may have a dome-like void space whose bottom is flat and the top is concave.

According to the present invention, at least a part of the light-incident portion includes at least one of a flat surface, a convex convex surface, a Fresnel concave lens surface, a Fresnel convex lens surface, a pattern surface, a scattered surface, And may be formed by selecting.

According to the present invention, a guide protrusion is formed to align the light emitting element with the light-entering portion, and the cross-section of the light-emitting portion has a first curvature center biased to the left with reference to the light- A left hemispherical portion having a first curvature and a second hemispherical portion having a first curvature and having a second curvature center biased to the right with respect to the main beam, A left concave groove portion formed in the direction of the upper center point of the light emitting portion on the uppermost surface, and a right concave groove portion formed in the upper central point direction of the light emitting portion on the uppermost surface of the right hemisphere.

In addition, according to the present invention, the lens body may include a first portion formed with an empty space therein and an opening formed at a lower portion thereof to communicate with the empty space; And a second portion installed in the opening of the first portion to seal the empty space.

Further, according to the present invention, the second portion may include a translucent member formed in a shape corresponding to the opening in which the light-incident portion is formed; And a light conversion material provided on or inside the light transmissive member and including a phosphor or a quantum dot that converts the wavelength of light passing through the light transmissive member.

According to the present invention, the translucent member comprises: a first translucent member; And a second translucent member fixed to the first translucent member, wherein the photo-conversion material is provided between the first translucent member and the second translucent member, and the first translucent member or the second translucent member, The diameter of which is not more than the diameter of the ring.

Further, according to the present invention, the opening portion of the first portion may have a receiving groove portion corresponding to the second portion, and the second portion may be inserted into the receiving groove portion and fixed by an adhesive.

In addition, according to the present invention, the filler made by selecting at least one of air, an inert gas, a light-transmitting liquid, a light-transmitting solid and a combination thereof, which is different from the refractive index of the lens body, have.

According to an aspect of the present invention, there is provided a backlight unit comprising: a lens body having a light-entering portion formed on a lower surface thereof, a light-emitting portion formed on an upper surface thereof, and a concave- An inner cavity having a hollow space in a sealed form between the light-entering portion and the light-emitting portion of the lens body so as to guide at least a part of the light incident through the light-incident portion in the lateral direction; And a light guide plate installed at an optical path of the light emitted from the light emitting unit.

According to some embodiments of the present invention as described above, the directionality and light efficiency of light can be greatly improved, and the light conversion material can be firmly protected from external heat conduction, moisture, foreign matter, And the effect of preventing the deviation of the light emitting axis can be obtained. Of course, the scope of the present invention is not limited by these effects.

1 is a perspective view showing a lens for a light emitting device according to some embodiments of the present invention.
2 is a cross-sectional view showing the lens for a light-emitting element of FIG.
3 is a cross-sectional view showing a lens for a light emitting device according to some other embodiments of the present invention.
4 is a cross-sectional view showing an example of a second portion of the lens for a light-emitting element of Fig.
Figs. 5 to 7 are cross-sectional views showing steps of manufacturing the second portion of Fig.
8 is a flowchart showing an example of a manufacturing method of the second part of Fig.
9 is a cross-sectional view showing a lens for a light emitting device according to still another embodiment of the present invention.
10 is a cross-sectional view illustrating a lens for a light emitting device according to still another embodiment of the present invention.
11 is a cross-sectional view showing a lens for a light emitting device according to still another embodiment of the present invention.
12 is a cross-sectional view illustrating a lens for a light emitting device according to still another embodiment of the present invention.
13 is a cross-sectional view showing a lens for a light emitting device according to still another embodiment of the present invention.
14 is a cross-sectional view showing a lens for a light emitting device according to still another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are described in order to more fully explain the present invention to those skilled in the art, and the following embodiments may be modified in various other forms, The present invention is not limited to the embodiment. Rather, these embodiments are provided so that this disclosure will be more thorough and complete, and will fully convey the concept of the invention to those skilled in the art. In the drawings, the thickness and size of each layer are exaggerated for convenience and clarity of explanation.

It is to be understood that throughout the specification, when an element such as a film, region or substrate is referred to as being "on", "connected to", "laminated" or "coupled to" another element, It will be appreciated that elements may be directly "on", "connected", "laminated" or "coupled" to another element, or there may be other elements intervening therebetween. On the other hand, when one element is referred to as being "directly on", "directly connected", or "directly coupled" to another element, it is interpreted that there are no other components intervening therebetween do. Like numbers refer to like elements. As used herein, the term "and / or" includes any and all combinations of one or more of the listed items.

Although the terms first, second, etc. are used herein to describe various elements, components, regions, layers and / or portions, these members, components, regions, layers and / It is obvious that no. These terms are only used to distinguish one member, component, region, layer or section from another region, layer or section. Thus, a first member, component, region, layer or section described below may refer to a second member, component, region, layer or section without departing from the teachings of the present invention.

Also, relative terms such as "top" or "above" and "under" or "below" can be used herein to describe the relationship of certain elements to other elements as illustrated in the Figures. Relative terms are intended to include different orientations of the device in addition to those depicted in the Figures. For example, if the element is inverted in the figures, the elements depicted as being on the upper surface of the other elements will have a direction on the lower surface of the other elements. Thus, the example "top" may include both "under" and "top" directions depending on the particular orientation of the figure. If the elements are oriented in different directions (rotated 90 degrees with respect to the other direction), the relative descriptions used herein can be interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a," "an," and "the" include singular forms unless the context clearly dictates otherwise. Also, " comprise "and / or" comprising "when used herein should be interpreted as specifying the presence of stated shapes, numbers, steps, operations, elements, elements, and / And does not preclude the presence or addition of one or more other features, integers, operations, elements, elements, and / or groups.

Hereinafter, embodiments of the present invention will be described with reference to the drawings schematically showing ideal embodiments of the present invention. In the figures, for example, variations in the shape shown may be expected, depending on manufacturing techniques and / or tolerances. Accordingly, the embodiments of the present invention should not be construed as limited to the particular shapes of the regions shown herein, but should include, for example, changes in shape resulting from manufacturing.

1 is a perspective view showing a lens 100 for a light emitting device according to some embodiments of the present invention. 2 is a cross-sectional view showing the lens 100 for a light-emitting element of FIG.

First, as shown in FIGS. 1 and 2, a lens 100 for a light emitting device according to some embodiments of the present invention may include a lens body 10 and an inner cavity 20.

For example, the lens body 10 has a light-incident portion 10a formed on a lower surface thereof, a light-emitting portion 10b formed on an upper surface thereof, and a concave groove portion 10c formed in a center portion of the upper surface thereof. .

More specifically, for example, the lens body 10 has a lens bottom 10d formed on a lower surface thereof, and at least one lens leg 10e protruding downward from the lens bottom 10d by a predetermined length, Can be formed.

The concave groove portion 10c and the lens bottom portion 10d and the lens leg portion 10e may be made of a translucent material integrally formed with the lens body 10. [

However, in the lens body 10, the light entering portion 10a, the light emitting portion 10b, the concave groove portion 10c, the lens bottom portion 10d, the lens leg portion 10e, Are not necessarily limited to those shown in the drawings, and can be modified and changed in various designs, shapes, materials, and the like without departing from the technical idea of the present invention.

Here, when the light passes through the interface between the medium and the medium such as air or a lens, the angle of refraction according to the traveling direction of the light may be changed depending on the nature of the medium, , And the optical characteristics of the lens body 10.

Therefore, the optical characteristics can be optimized by the material, the refractive index, the shape, and the optical characteristics of the lens body 10.

For example, when the lens body 10 is made of glass, the refractive index may be 1.45 to 1.96. Here, lead or bar can be added to increase the refractive index, and iron can be added to make it smaller.

In addition, the lens body 10 may be made of at least one of EMC, epoxy resin composition, silicone resin composition, modified epoxy resin composition, modified silicone resin composition, polyimide resin composition, modified polyimide resin composition , Polyphthalamide (PPA), polycarbonate resin, polyphenylene sulfide (PPS), liquid crystal polymer (LCP), ABS resin, phenol resin, acrylic resin and PBT resin.

In addition, the lens body 10 may be made of polycarbonate, polysulfone, polyacrylate, polystyrene, polyvinyl chloride, polyvinyl alcohol, polynorbornene, polyester, or the like. Various types of translucent resin-based materials can be applied.

In order to enhance the light dispersibility, a scattering pattern, a scattering member, or the like may be provided by various methods such as forming fine patterns, fine protrusions, diffusion films, or the like on the surface or inside of the lens body 10 have.

1 and 2, the inner cavity 20 is formed in the inner surface of the lens body 10 so that at least a part of the light incident through the light-incident portion 10a can be guided laterally. And may be an internal structure having an empty space A in a sealed form between the light-incident portion 10a and the light-emitting portion 10b.

More specifically, for example, the inner cavity portion 10 may be formed integrally with the lens body 10.

For example, a method of forming an air-tight space A in the inside of the lens body 10 includes a method of forming an inner air bubble using a laser, a method of dividing the lens body 10 into a plurality of pieces Various molding methods such as forming the molded body by ultrasonic welding or the like may be applied.

1 and 2, the inner cavity portion 20 has a flat bottom portion and a dome-shaped upper portion with a concave upper portion so that light passing through the inner cavity portion 20 can be guided laterally. And may have a merchant empty space (A).

However, the shapes and materials of the lens body 10 and the inner cavity portion 20 are not necessarily limited to the drawings and the above description.

2, the operation of the lens 100 for a light emitting device according to some embodiments of the present invention will be described. In the light emitting device 1, The light is incident inside through the light-incident portion 10a of the body 10, and the incident light can be first refracted laterally while passing through the interface of the internal cavity 20 having different mediums, And can be secondarily refracted in the lateral direction while passing through the light emitting portion 10b of the lens body 10. [

Therefore, even if the light-incident portion 10a is flat, the light can be refracted in the lateral direction using the internal cavity 20 described above, thereby facilitating the control of light in a desired direction have.

The upper surface of the light emitting element 1 can be opposed to or in contact with the light incident portion 10a, which is also in a flat shape. The light emitting element 1 is relatively easy to align the optical axis, ) And the light-incident portion 10a is short or very short, so that contamination of the light-emitting device 1 and the light-incident portion 10a by various foreign substances can be minimized.

3 is a cross-sectional view showing a lens 200 for a light emitting device according to some other embodiments of the present invention.

3, the light emitting device lens 200 according to some other embodiments of the present invention is configured such that the light emitting portion 10b has a cross section in which the light beam L of the light emitting element 1 is referred to as a reference A left hemisphere SL having a first curvature R1 and a second curvature center C2 biased to the right with respect to the main ray L, And a right hemisphere SR having the first curvature R1.

The concave groove portion 10c has a left concave groove portion HL whose cross section is formed in the direction of the upper center point of the light emitting portion on the uppermost surface of the left hemisphere portion SL and a concave groove portion HL on the uppermost surface of the right hemisphere portion SR, And a right concave groove portion HR formed in the direction of the upper center point of the light emitting portion.

Here, the light beam L may refer to a directional axis toward a path through which the largest amount of light among the light distribution distributions of the light emitted from the light emitting device 1 passes.

In the present invention, the case where the light beam L of the light emitting element 1 passes through the concave groove portion 10c is exemplified. However, the present invention is not limited to this, and the concave groove portion 10c may be formed at various positions in various shapes.

3, the lens body 10 of the light emitting device lens 200 according to some embodiments of the present invention may be assembled with each other to form an integral body, for example, And may include a first portion 10-1 and a second portion 10-2 formed therein.

More specifically, for example, as shown in FIG. 3, the first portion 10-1 has the empty space A formed therein, (OP) may be formed.

3, the second portion 10-2 may be installed in the opening OP of the first portion 10-1 so as to seal the empty space A. In addition, The lens structure may be a translucent material.

4 is a cross-sectional view showing an example of a second portion 10-2 of the lens 200 for a light-emitting element in Fig.

More specifically, for example, as shown in FIG. 4, the second portion 10-2 has the light-incident portion 10a formed on a lower surface thereof, and is formed in a shape corresponding to the opening OP A translucent member 10-3 and a phosphor or a quantum dot which is provided inside or on the upper surface of the translucent member 10-3 and which converts the wavelength of light passing through the translucent member 10-3, (10-4).

4, the translucent member 10-3 includes a first translucent member 10-31 and a second translucent member 10-31 fixed to the first translucent member 10-31, And the light conversion material 10-4 is provided between the first light transmission member 10-31 and the second light transmission member 10-32, 4 may have a diameter d less than or equal to the diameter D of the first translucent member 10-31 or the second translucent member 10-32.

Figs. 5 to 7 are sectional views showing steps of manufacturing the second portion 10-2 of Fig. 4, and Fig. 8 is a flowchart showing an example of a manufacturing method of the second portion 10-2 of Fig. 4 .

As shown in Figs. 5 to 8, the method of manufacturing the second portion 10-2 includes a second light transmitting member preparing step (Fig. 5) of preparing the second light transmitting member 10-32 of Fig. 5 (S200) of applying a photo-conversion material (S100) and a photo-conversion material (10-4) on the photo-conversion material (10-4) so as to be spaced apart therefrom. Then, as shown in FIG. 6, Forming a first light-transmissive member (S300) forming a light-transmissive material (10-3) and a neighboring photo-conversion material (10-4) (Step S400).

Here, the second translucent member 10-32 may be a glass material, and the first translucent member 10-31 may be a glass-coated material.

Therefore, the photo-conversion material 10-4 can be sealed by the first and second translucent members 10-31 and 10-32 described above, -4) is firmly protected from external heat conduction, moisture, foreign matter, etc., and the durability of the product can be greatly improved.

Therefore, if the second portion 10-2 separately made in the first portion 10-1 is assembled and integrated with an adhesive such as epoxy, the empty space A is formed therein, The light conversion material 10-4 is installed directly under the empty space A to minimize a distance of light generated in the light conversion material 10-4 to the empty space A, Directionality and light efficiency can be greatly improved and alignment of the light emitting element 1 as well as the light conversion material 10-4 can be facilitated to prevent the light emitting axis from being turned.

9 is a cross-sectional view showing a lens 300 for a light emitting device according to still another embodiment of the present invention, and Fig. 10 is a sectional view showing a lens 400 for a light emitting device according to still another embodiment of the present invention to be.

As shown in Figs. 3 and 9 and 10, the plane 10a1 of Fig. 3, the convex convex surface 10a2 of Fig. 9, and the Fresnel concave 10a2 of Fig. 10 are formed on a part of the light- A lens surface 10a3 or the like may be provided.

In addition, various types of optical systems such as a Fresnel convex lens surface, a pattern surface, a scattering surface, and a diffusing surface may be formed on the lower surfaces of the light-incident portion 10a or the second portion 10-2.

Therefore, the light generated from the light emitting element 1 can be guided in the direction of the main beam L through the optical system, or guided in the direction away from the main beam L, , It is possible to maintain the central light amount as a whole, thereby improving the uniformity of the overall light, and increasing the light amount as the uniformity is improved.

11 is a cross-sectional view showing a lens 500 for a light emitting device according to still another embodiment of the present invention.

11, the second portion 10-2 of the lens 500 for a light-emitting device according to some other embodiments of the present invention is formed such that the photo-conversion material 10-4 is applied on the top surface The second translucent member 10-32 may be formed of only the second translucent member 10-32.

Accordingly, when the second translucent member 10-32 is sealed with an adhesive to the opening OP of the first portion 10-1, the photo-conversion material 10-4 is also sealed in the empty space A, Therefore, the durability of the product can be greatly improved by being firmly protected from external heat conduction, moisture, foreign substances and the like. Therefore, since the above-mentioned first translucent member 10-31 can be omitted, the material cost and the manufacturing cost can be reduced.

12 is a cross-sectional view showing a lens 600 for a light emitting device according to still another embodiment of the present invention.

12, the refractive index of the lens body 10 may be different from the refractive index of the lens body 10 in the empty space A of the inner cavity 20 of the lens 600 for a light emitting device according to another embodiment of the present invention. A filler 30 made by selecting at least one of air, an inert gas, a light-transmitting liquid, a light-transmitting solid, and a combination thereof can be charged.

Accordingly, the filler 30 can protect the photo-conversion material 10-4 and the refractive index of the filler 30 can be adjusted to arbitrarily control the refraction direction of light.

13 is a cross-sectional view showing a lens 700 for a light emitting device according to still another embodiment of the present invention.

13, a second portion 10-2 is formed in the opening OP of the first portion 10-1 of the lens 700 for light emitting device according to still another embodiment of the present invention, And the second portion 10-2 may be inserted into the receiving groove H and fixed by an adhesive.

Here, the receiving groove portion (H) is in the form of a right angle groove, but the present invention is not limited thereto and the guide groove may be formed in various forms.

Accordingly, the second portion 10-2 can be naturally aligned in the process of inserting the second portion 10-2 into the receiving groove H as shown in FIG.

Therefore, alignment of the light emitting axes is easy, and the light efficiency can be increased through this.

14 is a cross-sectional view showing a lens 800 for a light emitting device according to still another embodiment of the present invention.

14, a lens 800 for a light emitting device according to another embodiment of the present invention includes a guide protrusion G formed to allow the light emitting element 1 to be aligned with the light incident portion 10a .

Here, the guide protrusion G has a stepped shape with a right-angled cross section, but the present invention is not limited thereto.

Therefore, in the course of assembling the light emitting element 1 inside the guide protrusion G, the light emitting element 1 can be naturally aligned in the right position.

Therefore, alignment of the light emitting axes is easy, and the light efficiency can be increased through this.

3, the backlight unit 1000 according to some embodiments of the present invention includes a light-incident portion 10a formed on a lower surface thereof, a light-emitting portion 10b formed on an upper surface thereof, A lens body 10 in which a concave groove 10c is formed at a central portion of the lens body 10 and a light incident portion 10b of the lens body 10 to guide at least a part of light incident through the light- An inner cavity 20 having an empty space A sealed between the light emitting portion 10a and the light emitting portion 10b and a light guide plate 90 provided in the light path of the light emitted from the light emitting portion 10b .

Here, the lens body 10 and the inner cavity 20 may include the lenses 100, 200, 300, 400 for light emitting devices according to various embodiments of the present invention shown in FIGS. 1 to 14 ) 500, (600) 700, and (800). Therefore, detailed description is omitted.

Also, the light guide plate 90 may be an optical member that can be made of a light transmitting material to guide light emitted through the light emitting unit 10b.

The light guide plate 90 may be installed in an optical path of light emitted through the light emitting unit 10b to transmit light over a wider area.

The light guide plate 90 may be made of polycarbonate, polysulfone, polyacrylate, polystyrene, polyvinyl chloride, polyvinyl alcohol, polynorbornene, polyester, or the like , And various light transmitting resin materials may be applied. Further, the light guide plate may be formed by various methods such as forming fine patterns, fine protrusions, diffusion films, or the like on the surface, or forming fine bubbles therein.

Although not shown, various diffusion sheets, prism sheets, filters, and the like may be additionally provided above the light guide plate 90. In addition, various display panels such as an LCD panel may be installed above the light guide plate 90.

Although not shown, the present invention can be applied to the above-described light emitting device 100, 200, 300, 400, 500, 600, 700, 800 or the backlight unit 1000 A lighting device or a display device. Here, the components of the illumination device or the display device according to some embodiments of the present invention may have the same configuration and functions as those of the above-described light-emitting element lens of the present invention. Therefore, detailed description is omitted.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

1: Light emitting element
10: Lens body
10a:
10a1: Flat
10a2: convex surface
10a3: convex concave lens surface
10b:
10c: concave groove
10d: lens bottom
10e: lens leg
20: inner cavity portion
A: empty space
G: Guide projection
L: Bowl light
C1: first curvature center
C2: center of the second curvature
R1: 1st curvature
SL: Left hemisphere
SR: right hemisphere
HL: Left concave groove
HR: Right concave groove
OP: opening
10-1: First part
10-2: Second part
10-3:
10-31: a first translucent member
10-32: a second translucent member
10-4: photo-conversion material
D, d: Diameter
H: receiving groove
30: Filler
90: light guide plate
100, 200, 300, 400, 500, 600, 700, 800:
1000: Backlight unit

Claims (10)

A lens body in which a light-entering portion is formed on a lower surface, a light-emitting portion is formed on an upper surface, and a concave groove is formed in a central portion of the upper surface; And
And an inner cavity having an empty space between the light entering portion and the light emitting portion of the lens body so as to guide at least a part of the light incident through the light entering portion in the lateral direction,
Wherein the lens body comprises:
A first portion in which the hollow space is formed and an opening is formed in a lower portion to communicate with the hollow space; And
And a second portion installed in the opening of the first portion to seal the empty space,
A receiving groove portion corresponding to the second portion is formed in the opening of the first portion,
And the second portion is inserted and fixed in the receiving groove portion. The method according to claim 1,
Wherein the inner cavity portion has a flat bottom portion and a dome-shaped void space having a top-topped concave portion. The method according to claim 1,
Wherein a part of the light-incident portion is formed by selecting at least one of a flat surface, a convex convex surface downward, a Fresnel concave lens surface, a Fresnel convex lens surface, a pattern surface, a scattering surface, A lens for a light emitting device. The method according to claim 1,
A guide protrusion is formed on the light-incident portion to align the light-emitting element,
Wherein the light emitting portion has a first hemispherical portion having a first curvature center biased to the left with respect to the main ray of the light emitting element and a second hemispherical portion having a first curvature and a second hemispherical portion having a second curvature center And a right hemispherical portion having the first curvature,
Wherein the concave groove portion has a left concave groove portion formed in the direction of the upper center point of the light emitting portion on the uppermost surface of the left hemisphere portion and a right concave groove portion formed in the direction of the upper center point of the light emitting portion on the uppermost surface of the right hemisphere portion , A lens for a light emitting element. delete The method according to claim 1,
Wherein the second portion comprises:
A light transmitting member formed on the lower surface of the light-incident portion and formed in a shape corresponding to the opening; And
A light conversion material provided on the inside or the upper surface of the translucent member and including a phosphor or a quantum dot that converts the wavelength of light passing through the translucent member;
And a light-emitting element. The method according to claim 6,
The light-
A first translucent member; And
And a second translucent member fixed to the first translucent member,
Wherein the light conversion material is provided between the first translucent member and the second translucent member and has a diameter equal to or smaller than a diameter of the first translucent member or the second translucent member. delete The method according to claim 1,
Wherein a filling material comprising at least one selected from the group consisting of air, an inert gas, a light-transmitting liquid, a light-transmitting solid and a combination thereof is filled in the hollow space of the inner cavity part, the refractive index being different from the refractive index of the lens body. A lens body in which a light-entering portion is formed on a lower surface, a light-emitting portion is formed on an upper surface, and a concave groove is formed in a central portion of the upper surface;
An inner cavity having an empty space between the light-entering portion and the light-emitting portion of the lens body so as to guide at least a part of light incident through the light-incident portion in a lateral direction; And
And a light guide plate installed on an optical path of light emitted from the light emitting unit,
Wherein the lens body comprises:
A first portion in which the hollow space is formed and an opening is formed in a lower portion to communicate with the hollow space; And
And a second portion installed in the opening of the first portion to seal the empty space,
A receiving groove portion corresponding to the second portion is formed in the opening of the first portion,
And the second portion is inserted into and fixedly secured to the receiving groove.

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