Laser module

Abstract

The invention discloses a laser module. The laser module comprises a substrate, a laser diode and a diffusion sheet, the substrate is provided with a surface and a reference plane, and the reference plane is parallel to the surface. The laser is arranged on the surface, and the laser diode can provide a light ray. The diffusion sheet is arranged on the laser diode, an included angle is formed between the diffusion sheet and the reference plane, and the included angle is larger than 5 degrees.

Description

Technical Field

[0001] The invention relates to a laser module, in particular to a laser module capable of providing an off-axis light shape effect. Background Art

[0002] The light-emitting principle and structure of light-emitting diodes (LEDs) are different from those of traditional light sources. They have the advantages of low power consumption, long component life, no warm-up time, and fast response speed. In addition, they are small in size, vibration-resistant, suitable for mass production, and easy to be made into extremely small or array components according to application requirements. They are widely used in the market, for example, optical display devices, laser diodes, traffic signs, data storage devices, communication devices, lighting devices, and medical devices.

[0003] In the past, laser modules were used in scenarios such as pedestrian recognition for autonomous vehicles and walking path recognition for sweeping robots. In order to focus the light provided by the laser module on the necessary area (for example, focusing the light on the ground when using the walking path recognition of sweeping robots), the laser module often needs to be installed in an inclined manner, which increases the design and parts costs, and also increases the size of the product. Summary of the invention

[0004] The embodiment of the present invention is to solve the previous problems and propose a laser module, including a substrate, a laser diode and a diffuser. The substrate has a surface and a reference plane, wherein the reference plane is parallel to the surface. The laser light source is arranged on the surface, wherein the laser diode can provide a light. The diffuser is arranged on the laser diode, wherein there is an angle between the diffuser and the reference plane, and the angle is greater than 5 degrees.

[0005] The laser module of the embodiment of the present invention is applied. Since the laser module can provide an off-axis light shape effect, the light provided by the laser module can be directly concentrated in the necessary area (for example, when the walking path recognition of the sweeping robot is applied, the light is concentrated on the ground), without the need to install the laser module in an inclined manner. The laser module of the embodiment of the present invention is easy to install, which can save design and parts costs and reduce the volume of the product.

[0006] The laser module of the embodiment of the present invention can be applied to products such as pedestrian recognition for automatic driving of vehicles, vehicle reversing radar, gesture recognition, walking path recognition for sweeping robots or unmanned guided vehicles, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 is a three-dimensional diagram of a laser module according to an embodiment of the present invention;

[0008] Figure 2 is a cross-sectional view of a laser module according to a first embodiment of the present invention;

[0009] Figure 3 is a schematic diagram of light emission of a laser module according to an embodiment of the present invention;

[0010] Figure 4 FIG. 4 is a cross-sectional view of a laser module according to a second embodiment of the present invention.

[0011] Explanation of symbols

[0012] M, M'~Laser module

[0013] 1~Substrate

[0014] 11. Surface

[0015] 2~Laser diode

[0016] 3. 3'~Diffuser

[0017] 31~Light-entering surface

[0018] 32~Light-emitting surface

[0019] 33~Diffusion microstructure

[0020] 4~Reflector

[0021] 41~Support

[0022] 411~slope

[0023] 42~Inner surface

[0024] P~reference plane

[0025] θ~Angle

[0026] L~Light

[0027] g~gap

[0028] A~Area DETAILED DESCRIPTION

[0029] Figure 1 is a perspective view showing a laser module according to an embodiment of the present invention. Figure 2 is a cross-sectional view showing a laser module according to a first embodiment of the present invention. Figure 1 , Figure 2 In one embodiment, the laser module M of the embodiment of the present invention comprises a substrate 1, a laser diode 2 and a diffuser 3. The substrate 1 has a surface 11 and a reference plane P, wherein the reference plane P is parallel to the surface 11. The laser diode 2 is disposed on the surface 11, wherein the laser diode 2 provides a light L. The diffuser 3 is disposed on the laser diode 2, wherein an angle θ exists between the diffuser 3 and the reference plane P, and the angle θ is greater than 5 degrees.

[0030] Reference Figure 2 In one embodiment of the present invention, the angle θ is less than 70 degrees. For example, in one embodiment, the angle θ may be 20 degrees, 35 degrees or 50 degrees.

[0031] Reference Figure 2 In one embodiment of the present invention, the laser module M further includes a reflector 4, wherein the reflector 4 is disposed on the substrate 1 and surrounds the laser diode 2, and the diffuser 3 is disposed on the reflector 4 and supported by the reflector 4.

[0032] In an embodiment of the present invention, the substrate 1 and the reflector 4 may be integrally formed, and the above disclosure does not limit the present invention.

[0033] Reference Figure 2 In one embodiment of the present invention, the medium between the laser diode 2 and the diffuser 3 is air. The above disclosure does not limit the present invention. In another embodiment of the present invention, the space between the laser diode 2 and the diffuser 3 may also be filled with other gases.

[0034] Refer to Figure 2 In one embodiment of the present invention, the material of the reflector 4 is selected from liquid crystal polymer (LCP), ceramic, copper, etc. In the embodiment of the present invention, the inner surface of the reflector 4 may also be covered with a reflective layer.

[0035] Refer to Figure 2 In one embodiment of the present invention, the reflector 4 includes a support portion 41 and an inner surface 42, the support portion 41 is formed on the inner surface 42, and the diffuser 3 is supported by the support portion 41. In the embodiment of the present invention, the support portion 41 includes an inclined surface 411 relative to the reference plane P, and the inclined surface 411 is suitable for substantially contacting the diffuser 3. In another embodiment of the present invention, the support portion 41 supports four edges of the diffuser 3. However, the above disclosure does not limit the present invention.

[0036] Refer to Figure 2 In one embodiment of the present invention, the reflector 4 is a rectangular, circular, cup-shaped or other annular structure. There is a gap g between the diffuser 3 and the inner surface 42. In the embodiment of the present invention, the gap g can be filled with glue. In another embodiment of the present invention, the diffuser 3 can be connected to the reflector 4 by gluing.

[0037] Refer to Figure 2 In one embodiment of the present invention, the material of the substrate 1 is selected from one of ceramic, glass fiber (FR4), resin (BT), solid molding material (EMC), etc.

[0038] Refer to Figure 2 In one embodiment of the present invention, the material of the diffusion sheet 3 is selected from polymer, glass and the like.

[0039] Figure 3 FIG. 2 is a diagram showing the light emission of the laser module according to an embodiment of the present invention. Figure 3 In one embodiment, the laser module of the present invention is used. The laser diode is a surface light source. The light emission range of the light L will be mainly concentrated in the area A on the diffuser 3, and the light shape will become, for example, an off-axis light shape of (+19 / -41 degrees, +38 / -45 degrees). In this way, the light L can be concentrated to the required irradiation area, the induction intensity can be increased, and the energy loss in unnecessary areas can be reduced. The above off-axis light shape data is only an example and is not intended to limit the present invention.

[0040] Matching reference Figure 2 , Figure 3 In one embodiment of the present invention, the light emitting angle of the above-mentioned off-axis light beam L can be perpendicular to the diffuser plate 3. However, the above disclosure does not limit the present invention. According to actual needs, the light emitting angle of the light beam L can be appropriately adjusted.

[0041] Figure 4 FIG. 2 is a cross-sectional view showing a laser module according to a second embodiment of the present invention. Figure 4 In an embodiment of the present invention, a laser module M' comprises a substrate 1, a laser diode 2 and a diffuser 3'. The laser diode 2 is disposed on the substrate 1, wherein the laser diode 2 provides a light L. The diffuser 3' is disposed on the laser diode 2. The laser module M' further comprises a reflector 4, wherein the reflector 4 is disposed on the substrate 1 and surrounds the laser diode 2, and the diffuser 3' is disposed on the reflector 4 and supported by the reflector 4. In this embodiment, the diffuser 3' comprises a diffuser microstructure 33, a light incident surface 31 and a light emitting surface 32, the light L enters the diffuser 3' from the light incident surface 31, and leaves the diffuser 3' from the light emitting surface 32, and the diffuser microstructure 33 is formed on the light incident surface 31. Through the diffuser microstructure 33 of the above-mentioned embodiment, a more significant light shape off-axis effect can be provided.

[0042] Refer to Figure 4 In another embodiment of the present invention, the medium between the laser diode 2 and the diffuser 3' is air. The above disclosure does not limit the present invention. In another embodiment, other gases may be filled between the laser diode 2 and the diffuser 3'. The material of the reflector 4 is selected from one of liquid crystal polymer materials (LCP), ceramics, copper, etc. In an embodiment of the present invention, the inner surface of the reflector 4 may also be covered with a reflective layer. The diffuser 3' can be connected to the reflector 4 by gluing. The material of the substrate 1 is selected from one of ceramics, glass fiber (FR4), resin (BT), solid molding material (EMC), etc. The material of the diffuser 3' is selected from one of polymers, glass, etc.

[0043] The laser module of the embodiment of the present invention can provide an off-axis light effect, so the light provided by the laser module can be directly concentrated on the necessary area (for example, when the walking path recognition of the sweeping robot is applied, the light is concentrated on the ground), without the need to install the laser module in an inclined manner. The laser module of the embodiment of the present invention is easy to install, which can save design and parts costs and reduce the volume of the product.

[0044] The laser module of the embodiment of the present invention can be applied to pedestrian recognition of vehicle automatic driving, vehicle reversing radar, gesture recognition, walking path recognition of sweeping robots or unmanned guided vehicles, etc. The above disclosure does not limit the present invention. The laser module of the embodiment of the present invention can also be used in other product applications.

[0045] Although the present invention has been disclosed as above with specific preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this technology can make slight changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the attached claims.

Claims

1. A laser module, comprising: A substrate having a surface and a reference plane, wherein the reference plane is parallel to the surface; a laser diode disposed on the surface; and A diffusion sheet is disposed on the laser diode, wherein an angle exists between the diffusion sheet and the reference plane, and the angle is greater than 5 degrees.

2. The laser module according to claim 1, wherein: The angle is less than 70 degrees.

3. The laser module according to claim 1, wherein: The laser diode provides the light.

4. The laser module according to claim 3, wherein: The diffuser comprises a deflection microstructure, a light incident surface and a light emitting surface. The deflection microstructure is formed on the light incident surface. The light enters the diffuser from the light incident surface and leaves the diffuser from the light emitting surface.

5. The laser module according to claim 1, further comprising a reflector, wherein: The reflector is arranged on the substrate and surrounds the laser diode, and the diffusion sheet is arranged on the reflector and supported by the reflector.

6. The laser module according to claim 5, wherein: The material of the reflector is selected from liquid crystal polymer (LCP), ceramic, copper and the like.

7. The laser module according to claim 5, wherein: The reflector comprises a supporting portion and an inner surface, the supporting portion is formed on the inner surface, and the diffusion sheet is supported by the supporting portion.

8. The laser module according to claim 5, wherein: The reflector is a ring-shaped structure such as a rectangle, a circle, or a cup.

9. The laser module according to claim 1, wherein: The material of the substrate is selected from one of ceramic, glass fiber (FR4), resin (BT), solid molding material (EMC), etc.

10. The laser module according to claim 1, wherein: The material of the diffusion sheet is selected from polymer, glass and the like.

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