TWI662229B - Light source module - Google Patents

Abstract

A light source module includes a light guide plate, a first reflection plate, a light emitting device, and a second reflection plate. The light guide plate has opposite top and bottom surfaces. The light guide plate includes a first groove on the top surface and a second groove on the bottom surface. The first reflecting plate is disposed on the top surface of the light guide plate to cover the first groove, and two light emitting regions are formed on the top surface. The light emitting device is disposed in the second groove and is suitable for providing a light beam. The second reflecting plate is disposed on the bottom surface of the light guide plate to cover the bottom surface and the second groove, wherein the light beam enters the light guide plate through the second groove, and is transmitted out of the light guide plate by the two light emitting areas.

Description

Light source module

The invention relates to an optical module, and in particular to a light source module.

In today's LED lighting devices that are used in road lighting, due to the characteristics of point light sources, the light emitting surface of the lamp presents many light spots, the intensity of the light spots is extremely high, and there is a strong contrast with the background, which is extremely uncomfortable visually. Recently, a few products have provided solutions for point-to-surface light sources, such as adding a diffused outer layer to the light emitting area of a lamp, or using an optical module such as an LCD backlight module. Although these methods solve the optical area in varying degrees, they are strongly contrasted. It is not comfortable, but it also destroys the proportion of optical energy that the street lamp should have in front of the lamp. Because the street light is located on the edge of the road, the energy projected from the light to the front and back of the lamp must be asymmetric light; if it is symmetrically distributed, nearly half of the light will be irradiated outside the road and waste, such as behind the lamp Dwellings or farmland, resulting in loss of light energy. In addition, in a lighting device in which a backlight module is applied to road lighting, a light-emitting element (such as a light-emitting diode) is disposed on a side of a light guide plate, so that a heat dissipation surface is perpendicular to a plane of the lighting device and located at an edge, resulting in poor heat dissipation. Effect. Therefore, how to design a road lighting device that can illuminate the road uniformly and uniformly, and improve the heat dissipation effect, is devoted by those skilled in the art.

The invention provides a light source module, which can provide asymmetric uniform light to improve light use efficiency, and can improve the heat dissipation effect of a light emitting device.

The invention provides a light source module including a light guide plate, a first reflection plate, a light emitting device, and a second reflection plate. The light guide plate has opposite top and bottom surfaces. The light guide plate includes a first groove on the top surface and a second groove on the bottom surface. The first reflecting plate is disposed on the top surface of the light guide plate to cover the first groove, and two light emitting regions are formed on the top surface. The light emitting device is disposed in the second groove and is suitable for providing a light beam. The second reflecting plate is disposed on the bottom surface of the light guide plate to cover the bottom surface and the second groove, wherein the light beam enters the light guide plate through the second groove, and is transmitted out of the light guide plate by the two light emitting areas.

In an embodiment of the present invention, the extending direction of the first groove is parallel to the extending direction of the second groove.

In an embodiment of the present invention, the first groove is composed of two planes, and an extending direction of the first groove is parallel to an extending direction of a short side of the light guide plate.

In an embodiment of the present invention, the second groove includes a plurality of sub-grooves, and is in a direction parallel to a short side of the light guide plate. The height of the sub-groove gradually decreases from one end of the short side of the light guide plate toward the other end of the short side of the light guide plate.

In an embodiment of the present invention, each of the sub-grooves is composed of three planes, and one of the planes is perpendicular to the light guide plate.

In an embodiment of the present invention, the shape of the above-mentioned sub-groove is a truncated triangular pyramid shape, and the sub-grooves communicate with each other.

In an embodiment of the present invention, the shape of the sub-grooves is a triangular pyramid shape, and the sub-grooves are not connected to each other.

In an embodiment of the present invention, the light-emitting device includes a plurality of light-emitting elements, and the light-emitting devices are respectively located in the sub-grooves.

In an embodiment of the present invention, the vertex angle of the first groove in a direction parallel to the long side of the light guide plate is greater than the vertex angle of the second groove in a direction parallel to the long side of the light guide plate. .

In an embodiment of the present invention, a height of the first groove is greater than or equal to a quarter of a thickness of the light guide plate.

In an embodiment of the present invention, the maximum height of the second groove is greater than or equal to the height of the first groove.

In an embodiment of the present invention, the light guide plate includes a plurality of optical microstructures.

In an embodiment of the present invention, an area of a top surface of the light guide plate is between 100 cm 2 and 1000 cm 2.

In an embodiment of the present invention, the thickness of the light guide plate is between 2 mm and 15 mm.

Based on the above, in the light source module of the present invention, the light beam provided by the light emitting device enters the light guide plate through the second groove of the light guide plate, and enters the light guide plate again through the first reflection plate disposed on the top surface of the light guide plate. The light beam re-entering the light guide plate can be transmitted out of the light guide plate by the two light emitting areas on the top surface of the light guide plate through the reflection of the second reflecting plate. At the same time, the light beam provided by the light emitting device can be deflected by the structural design of the second groove, thereby providing asymmetrical uniform light when the light is emitted, and the light use efficiency can be improved in lighting. In addition, the light-emitting device is arranged in parallel to the extending direction of the overall light source module, which will help improve the heat dissipation effect of the light-emitting device, thereby increasing the service life of the light source module.

In order to make the above features and advantages of the present invention more comprehensible, embodiments are hereinafter described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic perspective view of a light source module according to an embodiment of the present invention. Please refer to Figure 1. The light source module 100 of this embodiment can be applied to a lighting device on a road, such as a street lamp, which is suitable for providing asymmetrical uniform light to the road to improve light use efficiency, and can improve the light emitting device in the light source module 100 130 cooling effect. Specifically, in this embodiment, the light source module 100 includes a light guide plate 110, a first reflective plate 120, a light emitting device 130, and a second reflective plate 140.

FIG. 2A and FIG. 2B are perspective views of a part of the light source module of FIG. 1 at different perspectives, respectively. Please refer to FIGS. 1, 2A and 2B. The light guide plate 110 has a top surface S1 and a bottom surface S2 opposite to each other, and the light guide plate 110 includes a first groove 112 on the top surface S1 and a second groove 114 on the bottom surface S2. In this embodiment, the extending direction of the first groove 112 and the extending direction of the second groove 114 are both parallel to the extending direction of the short side of the light guide plate 110, as shown in FIGS. 2A and 2B. In other words, the extending direction of the first groove 112 is parallel to the extending direction of the second groove 114, but the present invention is not limited thereto. The area of the top surface S1 of the light guide plate 110 in this embodiment is between 100 cm 2 and 1000 cm 2, and the thickness L1 of the light guide plate 110 is between 2 mm and 15 mm. In addition, in this embodiment, the light guide plate 110 may include a plurality of optical microstructures (not shown) on the outer plane of the groove, which is suitable for allowing light to produce the effect of a surface light source. The plurality of optical microstructures may be added particulate bodies, optical microstructures, or atomized materials, and the present invention is not limited thereto.

The light emitting device 130 is disposed in the second groove 114 and is adapted to provide a light beam L. In detail, in this embodiment, the light-emitting device 130 includes a plurality of light-emitting elements 132, and the second groove 114 includes a plurality of sub-grooves 114a, and the light-emitting elements 132 are respectively located in the sub-grooves 114a. It is worth mentioning that since the light emitting element 132 is disposed in the second groove 114 of the bottom surface S2 of the light guide plate 110, the heat dissipation surface (not shown) of the light emitting element 132 is parallel to the extending direction of the overall light source module 100, that is, Light plane. In this way, the heat-dissipating surface close to the plane of the lamp will help to improve the heat-dissipating effect of the light-emitting device 130, thereby increasing the service life of the light source module 100.

The first reflecting plate 120 is disposed on the top surface S1 of the light guide plate 110 to cover the first groove 112 to form two light emitting regions C on the top surface S1 of the light guide plate 110. The second reflecting plate 140 is disposed on the bottom surface S2 of the light guide plate 110 to cover the bottom surface S2 of the light guide plate 110 and the second groove 114. The light emitting surfaces of these light emitting elements 132 are arranged toward the light guide plate 110. Therefore, the light beam L emitted by these light emitting elements 132 will enter the light guide plate 110 through the second groove 114 of the light guide plate 110, and after multiple reflections and refractions, the light guide plate 110 will be transmitted from the two light exit areas C, such as Shown in Figure 1.

FIG. 3 is a schematic top view of a part of the light source module of FIG. 1. FIG. 4 is a cross-sectional view of the light source module of FIG. 1 along line A-A. FIG. 5 is a cross-sectional view of the light source module of FIG. 1 along line B-B. Please refer to FIG. 1, FIG. 3, FIG. 4 and FIG. 5 at the same time. In detail, in this embodiment, the first groove 112 is composed of two planes and forms a vertex angle D1, as shown in FIG. 2A. Therefore, when the light beam L emitted from the light emitting device 130 is transmitted from the second groove 114 to the first groove 112, it will be refracted multiple times and transmitted to the first reflecting plate 120, and again reflected by the first reflecting plate 120. Passed into the light guide plate 110 as shown in FIG. 4. The light beam L re-entering the light guide plate 110 can be transmitted out of the light guide plate 110 by the two light-exiting areas C of the top surface S1 of the light guide plate 110 through the reflection of the second reflection plate 140.

On the other hand, the heights of the plurality of sub-grooves 114 a of the second groove 114 on the light guide plate 110 gradually decrease toward the same direction, as shown in FIG. 5. More specifically, each of the sub-grooves 114a is composed of three planes, and one of the planes is perpendicular to the light guide plate 110, and the other two surfaces are inclined surfaces that gradually decrease in height and are parallel to the long sides of the light guide plate 110. And a cross-section perpendicular to the short side of the light guide plate 110 forms a vertex angle D2, as shown in a partially enlarged view in FIG. 1 and FIG. 5. In addition, in this embodiment, the shape of the sub-grooves 114 a is a truncated triangular pyramid shape, and the sub-grooves 114 a communicate with each other, as shown in FIG. 5. However, in other embodiments, the shapes of the sub-grooves 114 a may be triangular pyramids according to the arrangement density of the plurality of light-emitting elements 132 in the light-emitting device 130, and the sub-grooves 114 a are not connected to each other.

Therefore, when the light beam L is emitted from the light emitting device 130 toward the top surface S1, the transmission path of the light beam L will be affected by the two inclined surfaces of the triangular-shaped sub-groove 114a. In this embodiment, the light beam L is deflected toward the tapered top direction of the sub-groove 114a, as shown in FIG. 1, FIG. 3, and FIG. In this way, when the light source module 100 is configured to illuminate a road, and the long side extension direction of the light source module 100 is parallel to the road extension direction, it can further provide an asymmetric uniform surface with a high ratio of light energy in a specific direction. Light can be further applied to lighting roads to improve light use efficiency.

In this embodiment, the angle of the vertex angle D1 of the first groove 112 in the direction parallel to the long side of the light guide plate 110 is greater than the vertex angle of the second groove 114 in the direction parallel to the long side of the light guide plate 110. D2 angle. In this embodiment, the height L2 of the first groove 112 is greater than or equal to a quarter of the thickness L1 of the light guide plate 110, and the maximum height L3 of the second groove 114 is greater than or equal to the height L2 of the first groove 112. However, the present invention is not limited to this.

In summary, in the light source module of the present invention, the light beam provided by the light emitting device enters the light guide plate through the second groove of the light guide plate, and enters the light guide plate again through the first reflection plate disposed on the top surface of the light guide plate. The light beam re-entering the light guide plate is totally reflected inside the light guide plate. When the total reflection is broken by the microstructure, the light guide plate is directly transmitted, or the light from the top surface of the light guide plate can be reflected by the reflection of the second reflection plate. The area passes out of the light guide plate. At the same time, the light beam provided by the light emitting device can be deflected by the structural design of the second groove, thereby providing an asymmetric uniform surface light with a high light energy ratio in a specific direction when the light is emitted, which can improve the light use efficiency in lighting. . In addition, the light-emitting device is arranged in parallel to the extending direction of the overall light source module, which will help improve the heat dissipation effect of the light-emitting device, thereby increasing the service life of the light source module.

Although the present invention has been disclosed as above with the examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some modifications and retouching without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be determined by the scope of the attached patent application.

100‧‧‧light source module

110‧‧‧light guide

112‧‧‧The first groove

114‧‧‧Second groove

114a‧‧‧Sub-groove

120‧‧‧first reflector

130‧‧‧light-emitting device

132‧‧‧Light-emitting element

140‧‧‧Second reflector

C‧‧‧Illuminating area

D1, D2‧‧‧Top angle

L‧‧‧ Beam

L1‧‧‧thickness

L2‧‧‧height

L3‧‧‧Maximum height

S1‧‧‧Top

S2‧‧‧ Underside

FIG. 1 is a schematic perspective view of a light source module according to an embodiment of the present invention. FIG. 2A and FIG. 2B are perspective views of a part of the light source module of FIG. 1 at different perspectives, respectively. FIG. 3 is a schematic top view of a part of the light source module of FIG. 1. FIG. 4 is a cross-sectional view of the light source module of FIG. 1 along line A-A. FIG. 5 is a cross-sectional view of the light source module of FIG. 1 along line B-B.

Claims (14)

A light source module includes: a light guide plate having an opposite top surface and a bottom surface, the light guide plate including a first groove on the top surface and a second groove on the bottom surface; a first reflection A plate disposed on the top surface of the light guide plate to cover the first groove and forming two light emitting areas on the top surface; a light emitting device disposed in the second groove and adapted to provide a light beam; and A second reflecting plate is disposed on the bottom surface of the light guide plate to cover the bottom surface and the second groove, wherein the light beam enters the light guide plate through the second groove, and is transmitted out of the light guide plate by the two light emitting areas. The light source module according to item 1 of the patent application, wherein the extending direction of the first groove is parallel to the extending direction of the second groove. The light source module according to item 1 of the scope of patent application, wherein the first groove is composed of two planes, and the extending direction of the first groove is parallel to the extending direction of the short side of the light guide plate. The light source module according to item 1 of the patent application scope, wherein the second groove includes a plurality of sub-grooves, and in a direction parallel to the short side of the light guide plate, the sub-grooves are in the light guide plate. The height gradually decreases from one end of the short side of the light guide plate toward the other end of the short side of the light guide plate. The light source module according to item 4 of the scope of patent application, wherein each of the sub-grooves is composed of three planes, and one of the planes is perpendicular to the light guide plate. The light source module according to item 4 of the scope of patent application, wherein the shapes of the sub-grooves are in the shape of a truncated triangular cone, and the sub-grooves are in communication with each other. The light source module according to item 4 of the scope of patent application, wherein the shapes of the sub-grooves are triangular pyramids, and the sub-grooves are not connected to each other. The light source module according to item 4 of the scope of patent application, wherein the light-emitting device includes a plurality of light-emitting elements respectively located in the sub-grooves. The light source module according to item 1 of the scope of patent application, wherein the vertex angle of the first groove in a direction parallel to the long side of the light guide plate is greater than the length of the second groove in parallel to the light guide plate. Vertex angle in the direction of the side. The light source module according to item 1 of the patent application scope, wherein a height of the first groove is greater than or equal to a quarter of a thickness of the light guide plate. The light source module according to item 1 of the scope of patent application, wherein the maximum height of the second groove is greater than or equal to the height of the first groove. The light source module according to item 1 of the patent application scope, wherein the light guide plate includes a plurality of optical microstructures. The light source module according to item 1 of the scope of patent application, wherein the area of the top surface of the light guide plate is between 100 cm 2 and 1000 cm 2. The light source module according to item 1 of the scope of patent application, wherein the thickness of the light guide plate is between 2 mm and 15 mm.