TW202024524A - Light source module - Google Patents

Abstract

A light source module including a light guide plate, a first reflecting plate, a light emitting device, and a second reflecting plate is provided. The light guide plate has opposite top surface and bottom surface. 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 to cover the first groove, and forms two light emitting regions on the top surface. The light emitting device is disposed in the second groove and is adapted to provide a light beam. The second reflecting plate is disposed on the bottom surface to cover the bottom surface and the second groove, wherein the light beam enters the light guide plate from the second groove and is transmitted from the two light emitting regions.

Description

Light source module

The present invention relates to an optical module, and particularly relates to a light source module.

In today's LED lighting devices 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, there have been a few products that provide solutions for spot-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 have different degrees of resolution, the optical area is strongly contrasted. It is uncomfortable, but it also destroys the proportion of the optical energy of the street lamp to the front of the lamp. Because the street lamp is located on the edge of the road, the energy of the light projected by the lamp to the front and behind the lamp must be asymmetrical light; if it is symmetrically distributed, nearly half of the light will be irradiated outside the road and form waste, such as behind the lamp Residential or farmland, which in turn causes loss of light energy. In addition, in the lighting device where the backlight module is applied to road lighting, the light-emitting element (such as a light-emitting diode) is arranged on the side of the light guide plate, so that the heat dissipation surface is perpendicular to the plane of the lighting device and located at the edge, resulting in poor heat dissipation Effect. Therefore, how to design a road lighting device that can illuminate the road intensively and uniformly while improving the heat dissipation effect is what those in the art are committed to.

The present 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 exit areas are formed on the top surface. The light emitting device is arranged in the second groove and is suitable for providing a light beam. The second reflecting plate is arranged 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 through the two light exit areas.

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

In an embodiment of the present invention, the above-mentioned first groove is formed by 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.

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

In an embodiment of the present invention, each of the aforementioned 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 above-mentioned sub-groove has a truncated triangular pyramid shape, and these sub-grooves are connected to each other.

In an embodiment of the present invention, the above-mentioned sub-groove has a triangular pyramid shape, and these sub-grooves are not connected to each other.

In an embodiment of the present invention, the aforementioned light-emitting device includes a plurality of light-emitting elements, which are respectively located in the aforementioned sub-groove.

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

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

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

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

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

In an embodiment of the present invention, the thickness of the aforementioned 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 re-enters the light guide plate through the reflection of the first reflecting plate arranged on the top surface of the light guide plate. The light beam reentering the light guide plate can be transmitted out of the light guide plate from the two light exit areas on the top surface of the light guide plate by the reflection of the second reflector 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 asymmetric and uniform light when emitting light, which can improve the light use efficiency in lighting. In addition, the arrangement of the light-emitting device parallel to the extending direction of the overall light source module 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-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

FIG. 1 is a three-dimensional schematic diagram of a light source module according to an embodiment of the invention. Please refer to Figure 1. The light source module 100 of this embodiment can be applied to a road lighting device, such as a street lamp, which is suitable for providing asymmetric surface uniform light to the road to improve light usage efficiency, and can improve the light emitting device in the light source module 100 130's heat dissipation effect. Specifically, in this embodiment, the light source module 100 includes a light guide plate 110, a first reflection plate 120, a light emitting device 130 and a second reflection plate 140.

2A and 2B are three-dimensional schematic diagrams of part of the light source module of FIG. 1 at different viewing angles. Please refer to Figure 1, Figure 2A and Figure 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 to this. In this embodiment, the area of the top surface S1 of the light guide plate 110 is between 100 square cm and 1000 square centimeters, 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 surface of the groove, which is suitable for allowing light to produce a surface light source effect. The plurality of optical microstructures can be added granular 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 suitable for providing 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-recesses 114a, and the light-emitting elements 132 are respectively located in the sub-recesses 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, namely Lamp plane. In this way, the heat dissipation surface close to the plane of the lamp will help improve the heat dissipation effect of the light emitting device 130, thereby increasing the service life of the light source module 100.

The first reflective 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 exit regions C on the top surface S1 of the light guide plate 110. The second reflective 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 beams L emitted by these light-emitting elements 132 will enter the light guide plate 110 from the second groove 114 of the light guide plate 110, and after multiple reflections and refractions, the light beams L will be transmitted out of the light guide plate 110 from the two light exit areas C, as in Shown in Figure 1.

3 is a schematic top view of 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 the line A-A. Fig. 5 is a cross-sectional view of the light source module of Fig. 1 along the line B-B. Please refer to Figure 1, Figure 3, Figure 4 and Figure 5 at the same time. In detail, in this embodiment, the first groove 112 is formed by two planes and forms a vertex D1, as shown in FIG. 2A. Therefore, when the light beam L emitted by 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 reflector 120, and is again reflected by the first reflector 120. Pass into the light guide plate 110, as shown in FIG. 4. The light beam L that reenters the light guide plate 110 can be transmitted out of the light guide plate 110 through the two light exit regions C on the top surface S1 of the light guide plate 110 by the reflection of the second reflective plate 140.

On the other hand, the heights of the multiple sub-grooves 114a of the second groove 114 on the light guide plate 110 are uniformly and gradually become smaller in the same direction, as shown in FIG. 5. More specifically, each sub-groove 114a is composed of three planes, and one of the planes is perpendicular to the light guide plate 110, and the other two surfaces form inclined surfaces that gradually decrease in height, and are parallel to the long sides of the light guide plate 110. And the cross section perpendicular to the short side of the light guide plate 110 forms an apex angle D2, as shown in the partially enlarged view of FIG. 1 and FIG. 5. In addition, in this embodiment, the shape of the sub-recesses 114a is a truncated triangular pyramid, and the sub-recesses 114a are connected to each other, as shown in FIG. 5. However, in other embodiments, according to the arrangement density of the plurality of light-emitting elements 132 in the light-emitting device 130, the shape of the sub-recesses 114a is triangular and the sub-recesses 114a 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 pyramid-shaped sub-groove 114a. In this embodiment, the light beam L will be deflected toward the cone-shaped top of the sub-groove 114a, as shown in FIGS. 1, 3, and 5. In this way, when the light source module 100 is configured to illuminate the road, and the long side of the light source module 100 extends parallel to the extending direction of the road, an asymmetric uniform surface with a higher proportion of light energy in a specific direction can be further provided. Light can be used to illuminate roads to improve light use efficiency.

In this embodiment, the apex angle D1 of the first groove 112 in the direction parallel to the long side of the light guide plate 110 is larger than the apex angle of the second groove 114 in the direction parallel to the long side of the light guide plate 110 The angle of D2. In this embodiment, the height L2 of the first groove 112 is greater than or equal to one-fourth 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 , But 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 re-enters the light guide plate through the reflection of the first reflecting plate disposed on the top surface of the light guide plate. The light beam that re-enters the light guide plate is totally reflected inside the light guide plate, and when the total reflection is broken by the microstructure, it is directly transmitted to the light guide plate, or can be reflected by the second reflector plate from the two lights on the top surface of the light guide plate. The zone passes out 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 proportion of light energy in a specific direction when the light is emitted, which can improve the light use efficiency in lighting . In addition, the arrangement of the light-emitting device parallel to the extending direction of the overall light source module 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 in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the relevant technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be subject to those defined by the attached patent scope.

100: light source module 110: light guide plate 112: first groove 114: second groove 114a: sub-recess 120: first reflector 130: light-emitting device 132: light-emitting element 140: second reflector C: light exit area D1, D2: top angle L: beam L1: thickness L2: height L3: maximum height S1: top surface S2: bottom surface

FIG. 1 is a three-dimensional schematic diagram of a light source module according to an embodiment of the invention. 2A and 2B are three-dimensional schematic diagrams of part of the light source module of FIG. 1 at different viewing angles. 3 is a schematic top view of 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 the line A-A. Fig. 5 is a cross-sectional view of the light source module of Fig. 1 along the line B-B.

100: light source module

110: Light guide plate

112: first groove

114: second groove

120: first reflector

130: light-emitting device

132: Light-emitting element

140: second reflector

C: Light emitting area

L: beam

S1: Top surface

S2: bottom surface

Claims (14)

A light source module includes: a light guide plate having a top surface and a bottom surface opposite to each other, 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 is disposed on the top surface of the light guide plate to cover the first groove, and two light exit areas are formed on the top surface; a light emitting device is disposed in the second groove and is suitable for providing a light beam; and The second reflecting plate is arranged 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 through the two light exit areas. According to the light source module described in claim 1, wherein the extending direction of the first groove is parallel to the extending direction of the second groove. According to the light source module described in claim 1, wherein the first groove is formed by 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. According to the light source module described in claim 1, 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 on 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. According to the light source module described in item 4 of the scope of patent application, each of the sub-grooves is composed of three planes, and one of the planes is perpendicular to the light guide plate. According to the light source module described in item 4 of the scope of patent application, the shape of the sub-grooves is a truncated triangular pyramid shape, and the sub-grooves communicate with each other. According to the light source module described in item 4 of the scope of patent application, the shape of the sub-grooves is a triangular pyramid shape, and the sub-grooves are not connected to each other. According to the light source module described in claim 4, the light-emitting device includes a plurality of light-emitting elements which are respectively located in the sub-grooves. The light source module described in the first item of the scope of patent application, wherein the apex angle of the first groove in the direction parallel to the long side of the light guide plate is greater than that of the second groove in parallel to the length of the light guide plate. The vertex angle in the direction of the edge. According to the light source module described in item 1 of the scope of patent application, the height of the first groove is greater than or equal to a quarter of the thickness of the light guide plate. According to the light source module described in claim 1, wherein the maximum height of the second groove is greater than or equal to the height of the first groove. According to the light source module described in item 1 of the scope of patent application, the light guide plate includes a plurality of optical microstructures. According to the light source module described in item 1 of the scope of patent application, the area of the top surface of the light guide plate is between 100 square centimeters and 1000 square centimeters. According to the light source module described in item 1 of the scope of patent application, the thickness of the light guide plate is between 2 mm and 15 mm.

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