TWI516807B - Lens and direct type light source module - Google Patents

Description

Lens and direct light source module

The present invention relates to an optical component and an optical module, and more particularly to a lens and a direct type light source module.

In recent years, with the improvement of the luminous efficiency and life of the Light Emitting Diode (LED), coupled with low energy consumption, low pollution, high efficiency, high reaction speed, small size, light weight and various surfaces With the features and advantages of components, LEDs have also been actively used in various optical fields. In general, the light-emitting diode can be applied to various types of lighting devices in daily life as well as light sources of various flat-panel displays such as liquid crystal displays (LCDs).

In addition, with the advancement of optical technology, more and more illumination patterns that can be provided by light source devices have been developed. However, since the light-emitting diode is a light source having directivity, it can provide a small change in the illumination light shape itself. In order to provide more possibilities for light shape, the technique of arranging various suitable shapes of lenses on the light-emitting path of the light-emitting diode to provide appropriate light shape has become a research and development focus in the field of illumination.

However, in the lateral light-emitting diode package used in the direct-light source module, when the lens is disposed on the light-emitting path of the light-emitting diode, the light that the light-emitting diode can provide can be provided. The shape of the central dark area appears at the near optical axis. Thus, when the light emitting diode light source is applied to the light source module, it may affect the uniform brightness in the effective illumination area, thereby affecting the picture quality of the display.

The present invention provides a lens that eliminates dark area phenomena formed by a light source.

The invention provides a direct type light source module which can provide a uniform surface light source.

A lens according to an embodiment of the invention includes a light incident surface, a reflective curved surface, and a light exiting surface. The light incident surface includes a first optical surface and a second optical surface. The first optical surface is a flat or convex surface. The first optical surface is coupled to the second optical surface. The gradient at the junction of the first optical surface and the second optical surface changes abruptly, and the second optical surface is convex toward an optical axis of the lens. The reflective surface is opposite to the light incident surface, and the reflective curved surface forms a first recess in the center of the lens. The light-emitting side is connected to the light surface and the reflective surface.

A direct type light source module according to an embodiment of the present invention includes a plurality of light emitting units. The light emitting units are arranged in an array, and each of the light emitting units includes a aforementioned lens and a light emitting element. The light emitting element emits a light beam, wherein when the first optical surface is convex, the first optical surface is convex toward the light emitting element, and the light beam enters the lens via the light incident surface.

In an embodiment of the invention, the lens is axisymmetric with respect to the optical axis.

In an embodiment of the invention, the first optical surface is located on the optical axis.

In an embodiment of the invention, the angle between the first optical surface and the outer surface of the second optical surface outside the lens falls within a range of 114 degrees to 124 degrees.

In an embodiment of the invention, the first optical surface is convex along a direction substantially parallel to the optical axis.

In an embodiment of the invention, the lens further includes a peripheral surface surrounding the second optical surface, wherein the first optical surface and the second optical surface are recessed relative to the peripheral surface to form a first surface relative to the first recess Two depressions.

In an embodiment of the invention, the light beam includes a first sub-beam and a second sub-beam, and the first sub-beam sequentially penetrates into the first optical surface of the optical surface, and is reflected and worn by the reflective surface. After the first sub-beam passes through the first optical surface, the lens is emitted through the reflective curved surface at the near-optical axis, and the second sub-beam sequentially penetrates into the second optical surface of the optical surface and is reflected Reflecting and penetrating the light side, and the light divergence angle of the first sub beam is smaller than the light divergence angle of the second sub beam.

In an embodiment of the invention, when the first sub-beam passes through the first optical surface, it is turned toward a direction close to the optical axis, and when the second sub-beam passes through the second optical surface, Will turn towards the direction of the optical axis.

Based on the above, the lens, the light-emitting unit, and the direct-type light source module of the embodiment of the present invention are configured by the second recess formed by the first optical surface and the second optical surface, so that the light-emitting component can provide the portion The light of the beam can be properly Through the near-optical axis of the penetrating lens, other parts of the beam can be totally reflected by the reflective surface to the light-emitting side, so that the light-emitting unit can avoid the central dark area at the near-optical axis, and thus can achieve uniform overall light. The energy distribution, in turn, allows the direct light source module to provide a uniform surface source.

The above described features and advantages of the invention will be apparent from the following description.

60‧‧‧ Beam

61‧‧‧First sub-beam

63‧‧‧Second sub-beam

65‧‧‧ Third sub-beam

100, 100a‧‧ lens

110, 110a‧‧‧ into the glossy surface

111, 111a‧‧‧ first optical surface

113‧‧‧Second optical surface

120‧‧‧Reflective surface

130‧‧‧Lighting side

140‧‧‧ peripheral surface

200, 200a‧‧‧Lighting unit

210‧‧‧Lighting elements

300‧‧‧Direct light source module

310‧‧‧Reflection unit

320‧‧‧Diffuser

330‧‧‧Optical diaphragm

S1‧‧‧ accommodating space

RS1‧‧‧ first depression

RS2‧‧‧second depression

PS‧‧‧ surface

JT‧‧‧ junction

O‧‧‧ optical axis

α, β, γ, θ‧‧‧ angle

d, D‧‧‧ distance

1A is a schematic cross-sectional view of a light emitting unit according to an embodiment of the invention.

1B is a schematic cross-sectional view of a light emitting unit according to another embodiment of the present invention.

2 is a light trace of the light emitting unit of FIG. 1A.

FIG. 3 is a schematic structural diagram of a direct type light source module according to an embodiment of the invention.

1A is a schematic cross-sectional view of a light emitting unit according to an embodiment of the invention. 1B is a schematic cross-sectional view of a light emitting unit according to another embodiment of the present invention. 2 is a light trace of the light emitting unit of FIG. 1A. Referring to FIG. 1A , FIG. 1B and FIG. 2 , in the embodiment, the light emitting unit 200 includes a lens 100 and a light emitting element 210 . In addition, the light-emitting element 210 of the present embodiment is, for example, a light-emitting diode, but the invention is not limited thereto.

Specifically, as shown in FIG. 1A, in the embodiment, the lens 100 includes A light incident surface 110, a reflective curved surface 120, and a light exiting surface 130, and the lens 100 further includes an optical axis O and is axisymmetric with respect to the optical axis O. The light incident surface 110 includes a first optical surface 111 and a second optical surface 113. The first optical surface 111 is coupled to the second optical surface 113. In detail, the first optical surface 111 is located on the optical axis O and is convex in a direction substantially parallel to the optical axis O, and the second optical surface 113 is convex toward the optical axis O of the lens 100. In more detail, in the embodiment, the first optical surface 111 is convex, and the first optical surface 111 is convex toward the light emitting element 210, and the light emitting element 210 is disposed on the optical axis O, but the invention is not limited thereto. . In another embodiment, as shown in FIG. 1B, the light emitting unit 200a is similar in structure to the light emitting unit 200, but the first optical surface 111a of the light incident surface 110a of the lens 100a may also be a flat surface.

On the other hand, please refer to FIG. 1A again, in more detail, in FIG. 1A. In an embodiment, the gradient of the junction JT of the first optical surface 111 and the second optical surface 113 may be designed to be substantially discontinuous, that is, the junction JT is designed to be a turning point instead of an arc curved portion. However, in general, when the lens 100 is formed by injection molding, the lens 100 forms a sharp change in the gradient at the junction of the first optical surface 111 and the second optical surface 113 when the lens 100 is released. Curved surface. For example, in the present embodiment, the angle α of the outer angle of the first optical surface 111 and the second optical surface 113 outside the lens 100 falls within a range of 114 degrees to 124 degrees. Here, the outer angle is defined as the angle between the tangent plane of the first optical surface 111 at the junction JT and the tangent plane of the second optical surface 113 at the junction of the JT outside the lens 100. Further, the ratio of the width d of the first optical surface 111 to the width D of the second optical surface 113 is from 1/13 to 1/11. In the range. It should be noted that the numerical ranges herein are for illustrative purposes only and are not intended to limit the invention.

In addition, as shown in FIG. 1A, in the present embodiment, the reflective curved surface 120 is opposite to the light incident surface 110, and a first recess RS1 is formed in the center of the lens 100. The light emitting side surface 130 is connected to the light surface 110 and the reflective curved surface 120. In addition, in the embodiment, the lens 100 further includes a peripheral surface 140 surrounding the second optical surface 113, and the peripheral surface 140 is connected to the second optical surface 113 via a surface PS, wherein the first optical surface 111 and the second optical surface 113 is recessed with respect to the peripheral surface 140 to form a second recess RS2 with respect to the first recess RS1. For example, in the embodiment, the angle β between the reflective curved surface 120 and the light exiting side 130 is, for example, in the range of 73 degrees to 83 degrees, and the angle between the light emitting side surface 130 and the peripheral surface 140. γ, for example, falls within the range of 79 to 89 degrees. Further, the angle θ of the cut line obtained by cutting the first recess RS1 along the optical axis O is, for example, falling within the range of 42 degrees to 52 degrees. It should be noted that the numerical ranges of the angles herein are for illustrative purposes only and are not intended to limit the invention.

For example, in another embodiment, the angle α of the outer angle of the first optical surface 111 and the second optical surface 113 outside the lens 100 may be in the range of 153 degrees to 163 degrees, and the first optical surface 111 The ratio of the width d to the width D of the second optical surface 113 may be in the range of 1/13 to 1/11. The angle β between the reflective curved surface 120 and the light exiting side 130 may be in the range of 77 degrees to 87 degrees, and the angle γ between the light emitting side surface 130 and the peripheral surface 140 may be between 79 degrees and 89 degrees. Within the range of degrees. In addition, the first recess RS1 is cut along the optical axis O. The angle θ of the cut line may be in the range of 38 to 48 degrees. Wherein, when the ray passing through the tangential line of the second optical surface 113 at the position on the second optical surface 113 with respect to the optical axis O is increased to a certain extent, the light is concentrated, that is, toward the optical axis O. The direction is turned, and when the tangential line of the second optical surface 113 at the position on the second optical surface 113 is smaller than the acute angle of the optical axis O, the light is diverged, that is, away from the light. The direction of the axis O is turned. The invention does not limit the acute angle between the tangential line and the optical axis O to be large enough to cause the light to converge, or to be small enough to cause the light to diverge, which can be adjusted according to actual needs.

Further, in the present embodiment, when the light emitting element 210 emits light, Light emitting element 210 can emit a beam of light 60 that enters lens 100 via light entrance surface 110. More specifically, in the present embodiment, the light beam 60 includes a first sub-beam 61, a second sub-beam 63, and a third sub-beam 65 that are incident on the lens 100 at different angles. In this embodiment, a portion of the first sub-beam 61 sequentially penetrates the first optical surface 111 of the light surface 110, is reflected by the reflective curved surface 120, and penetrates the light side surface 130. Part of the first sub-beam 61 penetrates the After the first optical surface 111, the lens 100 is emitted through the reflective curved surface 120 at the near optical axis O. The second sub-beam 63 sequentially penetrates the second optical surface 113 of the optical surface 110, is reflected by the reflective curved surface 120, and penetrates the light. The side surface 130 and the third sub-beam 65 exit the lens 100 via the light-emitting side surface 130 after penetrating the surface PS of the peripheral surface 140 and the second optical surface 113. In more detail, as shown in FIG. 1A and FIG. 2, when the first sub-beam 61 penetrates the first optical surface 111, it will turn toward the optical axis O, and when the second sub-beam 63 penetrates the first After the two optical faces 113, they are turned toward the optical axis O. Further, in this embodiment, borrowing The second recess RS2 formed by the first optical surface 111 of the lens 100 and the second optical surface 113 is designed such that the light divergence angle of the first sub-beam 61 will be smaller than the light divergence angle of the second sub-beam 63.

In addition, in this embodiment, a reflective structure (not shown) that can be used to reflect light, such as a reflective sheet, a reflective plate, or a reflective layer, may be selectively disposed on the peripheral surface 140. As a result, as shown in FIG. 2, part of the light is reflected by the reflective curved surface 120 and the light emitting side surface 130 back to the periphery of the lens 100 after penetrating the portion of the second optical surface 113 that is relatively gentle near the surface PS. At the surface 140, it can be reflected by the above-mentioned reflective structure to the vicinity of the optical axis O to complement the light at the center of the light-emitting unit 200.

In this way, the light-emitting unit 200 of FIG. 1A can make the light of the partial light beam 60 that can be provided by the light-emitting element 210 be properly concentrated at the near-optical axis O, and the light beams 60 of other portions can be reflected by the curved surface 120. It is totally reflected to the light exiting side 130, and a central dark area can be avoided at the near optical axis O, and a uniform overall light energy distribution can be achieved.

On the other hand, referring to FIG. 1B again, since the light emitting unit 200a of FIG. 1B is also similar in structure to the light emitting unit 200, the light of the partial light beam 60 that can be provided by the light emitting element 210 can be properly penetrated through the lens. At the near optical axis O, the other portions of the beam 60 can be totally reflected by the reflective curved surface 120 to the light exiting side 130, thereby avoiding a central dark region at the near optical axis O, and can be similar to the light emitting unit 200. The function of this will not be repeated here.

3 is a schematic diagram showing the architecture of a direct type light source module according to an embodiment of the invention; intention. Referring to FIG. 3 , the direct light source module 300 of the present embodiment includes a plurality of light emitting units 200 , a reflecting unit 310 , a diffusing plate 320 , and at least one optical film 330 . In detail, in the present embodiment, the reflection unit 310 and the diffusion plate 320 together form an accommodating space S1, and the illuminating units 200 are arranged in an array and are accommodated in the accommodating space S1, that is, the reflecting unit 310 is A light box, but the invention is not limited thereto. In another embodiment, the reflective unit 310 can also be a reflective sheet disposed at the bottom of the light box. In addition, the diffusion plate 320 is located between the reflective unit 310 and an optical film 330. In this embodiment, the optical film 330 may include at least one of a cymbal sheet, a diffusion sheet, and other optical films, but the invention is not limited thereto.

Specifically, referring to FIG. 2 and FIG. 3 , in the embodiment, the reflection unit 310 and the diffusion plate 320 are disposed on the transmission path of the light beam 60 from the light emitting unit 200 , and the light emitting unit 200 is distributed on one of the diffusion plates 320 . side. Further, after the light beam 60 is emitted from the lens 100, most of the light beam 60 exits the lens 100 through the upper half of the light-emitting side surface 130 and is directly transmitted to the diffusion plate 320. In this way, the phenomenon that the light beam 60 is emitted horizontally through the light exiting side 130 and the light reflected upward by the reflecting unit 310 is concentrated on the diffusing plate 320 can be reduced, and a large brightening on the diffusing plate 320 can be avoided. Dark ratio. Furthermore, when the light is transmitted to the diffuser 320, the direct-type light source module 300 will uniformize the light distribution through the diffuser 320, and correct the light direction by the optical film 330 to enhance the direct light source. The positive luminance of the module 300.

In addition, in the lens 100, the light emitting unit 200, and the direct type light source module 300 of the embodiment, the light of the partial light beam 60 that can be provided by the light emitting element 210 The light beam 60 of the other portion can be totally reflected by the reflective curved surface 120 to the light exiting surface 130, so when the light emitting unit 200 is applied to the direct light source module 300, A situation in which a central dark area is generated at the near optical axis O of the light emitting unit 200 can be avoided. In this way, the direct type light source module 300 of the embodiment can provide a uniform surface light source.

In summary, the lens, the light-emitting unit, and the direct-type light source module of the embodiment of the present invention can be provided by the light-emitting element by the second recessed structure formed by the first optical surface and the second optical surface. The light of part of the beam can be properly penetrated through the near-optical axis of the lens, and the other parts of the beam can be totally reflected by the reflective surface to the light-emitting side, so that the light-emitting unit can avoid generating a central dark area at the near-optical axis. Therefore, a uniform overall light energy distribution can be achieved, thereby providing a direct surface light source module with a uniform surface light source.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

60‧‧‧ Beam

61‧‧‧First sub-beam

63‧‧‧Second sub-beam

65‧‧‧ Third sub-beam

100‧‧‧ lens

110‧‧‧Into the glossy surface

111‧‧‧First optical surface

113‧‧‧Second optical surface

120‧‧‧Reflective surface

130‧‧‧Lighting side

140‧‧‧ peripheral surface

200‧‧‧Lighting unit

210‧‧‧Lighting elements

RS1‧‧‧ first depression

RS2‧‧‧second depression

PS‧‧‧ surface

JT‧‧‧ junction

O‧‧‧ optical axis

α, β, γ, θ‧‧‧ angle

d, D‧‧‧ distance

Claims (10)

A lens includes: a light incident surface, comprising: a first optical surface, the first optical surface is a plane or a convex surface; and a second optical surface, the first optical surface is connected to the second optical surface, the first a gradient of an interface between the optical surface and the second optical surface changes abruptly, and the second optical surface is convex toward an optical axis of the lens; a reflective curved surface opposite to the light incident surface, And the reflective curved surface forms a first recess in the center of the lens; and a light emitting side surface connecting the light incident surface and the reflective curved surface. The lens of claim 1, wherein the lens is axisymmetric with respect to the optical axis. The lens of claim 1, wherein the first optical surface is located on the optical axis. The lens of claim 1, wherein an angle of the first optical surface and an outer angle of the second optical surface outside the lens falls within a range of 114 degrees to 124 degrees. The lens of claim 1, wherein the first optical surface is convex in a direction substantially parallel to the optical axis. The lens of claim 1, further comprising: a peripheral surface surrounding the second optical surface, wherein the first optical surface and the second optical surface are recessed relative to the peripheral surface to form relative to the second optical surface First recessed one The second depression. A direct light source module includes: a plurality of light emitting units arranged in an array, each of the light emitting units comprising: a lens comprising: a light incident surface, comprising: a first optical surface, wherein the first optical surface is a plane or a convex surface; and a second optical surface, the first optical surface being connected to the second optical surface, a gradient of the intersection of the first optical surface and the second optical surface is sharply changed, and the second The optical surface is convex toward a direction of an optical axis of the lens; a reflective curved surface opposite to the light incident surface, the reflective curved surface forming a first recess in the center of the lens; and a light emitting side connecting the light entering And a light emitting element emitting a light beam, wherein when the first optical surface is convex, the first optical surface is convex toward the light emitting element, and the light beam enters the lens via the light incident surface . The direct-type light source module of claim 7, wherein the light beam comprises a first sub-beam and a second sub-beam, and the first sub-beam sequentially penetrates the first surface of the incident surface An optical surface is reflected by the reflective curved surface and penetrates the light emitting side surface. After the first sub-beam passes through the first optical surface, the lens is emitted through the reflective curved surface at the near optical axis, and the second sub-beam is emitted. Passing through the light-emitting surface in sequence The second optical surface is reflected by the reflective curved surface and penetrates the light exiting side, and the light divergence angle of the first sub-beam is smaller than the light divergence angle of the second sub-beam. The direct-type light source module of claim 8, wherein when the first sub-beam penetrates the first optical surface, it is turned toward a direction close to the optical axis, and when the second sub-beam is After penetrating the second optical surface, it will turn toward the optical axis. The direct-lit light source module of claim 7, wherein the lens further comprises a peripheral surface surrounding the second optical surface, and the first optical surface and the second optical surface are opposite to the periphery The surface is recessed to form a second recess relative to the first recess.