Projection device and light source module

Abstract

The invention provides a projection device and a light source module thereof. The projection device comprises the light source module, a light valve and a projection lens. The light source module comprises a light-emitting element, a light diffusion assembly, a first structural member and a first temperature sensing element. The light-emitting element is adapted to emit an illumination beam. The light diffusion assembly is adapted to diffuse the illumination beam. The light diffusion assembly is provided with a front end and a rear end which are opposite, the front end of the light diffusion assembly faces the light-emitting element, and the rear end of the light diffusion assembly faces the first structural part. The first temperature sensing element is arranged on the first structural member and corresponds to the light diffusion assembly. The light valve is suitable for converting the illumination light beam from the light source module into an image light beam. The projection lens is suitable for projecting the image light beam.

Description

Technical Field

[0001] The present invention relates to a projection device and a light source module thereof, and in particular to a projection device including a light diffusion component and a light source module thereof. Background Art

[0002] The application of micro-projection devices is becoming more and more extensive. They can be used in automotive lighting systems and matched with adaptive driving beam (ADB) technology to project driving information. If the optical elements such as lenses contained in the light diffusion component and / or wavelength conversion component in the micro-projection device are broken due to unexpected factors, the light transmitted between them will leak out and cause light hazard problems.

[0003] Therefore, it is necessary to design a new type of projection device and light source module to overcome the above defects. Summary of the invention

[0004] The object of the present invention is to provide a projection device and a light source module, which can avoid the light hazard problem caused by the breakage of optical elements.

[0005] To achieve the above-mentioned purpose, the present invention provides a light source module, including: a light-emitting element, suitable for emitting a lighting beam; a light diffusion component, suitable for diffusing the lighting beam, wherein the light diffusion component has a first front end and a first rear end relative to each other, and the first front end of the light diffusion component faces the light-emitting element; a first structural member, and the first rear end of the light diffusion component faces the first structural member; and a first temperature sensing element, which is configured on the first structural member and corresponds to the light diffusion component.

[0006] Preferably, the illumination light beam is adapted to be incident on the light diffusion component along an incident direction, and when viewed along the incident direction, the first temperature sensing element overlaps the light diffusion component.

[0007] Preferably, the distance between the first structure and the light diffusion component is smaller than the distance between the light diffusion component and the light emitting element.

[0008] Preferably, the first structural member is a metal plate.

[0009] Preferably, the first structural member has a first surface and a second surface opposite to each other, the first surface faces the light diffusion component, and the first temperature sensing element is disposed on the second surface.

[0010] Preferably, it also includes a wavelength conversion element, a second structural member and a second temperature sensing element, wherein the wavelength conversion element is suitable for converting the wavelength of the illumination light beam, the wavelength conversion element has a second front end and a second rear end relative to each other, the second front end of the wavelength conversion element faces the space between the light emitting element and the light diffusion component, the second rear end of the wavelength conversion element faces the second structural member, and the second temperature sensing element is configured on the second structural member and corresponds to the wavelength conversion element.

[0011] Preferably, a semi-transmissive and semi-reflective element is further included, wherein the semi-transmissive and semi-reflective element is located on the transmission path of the illumination light beam, a portion of the illumination light beam is reflected by the semi-transmissive and semi-reflective element to the wavelength conversion element, and another portion of the illumination light beam passes through the semi-transmissive and semi-reflective element to reach the light diffusion component.

[0012] Preferably, the wavelength conversion element and the second temperature sensing element are disposed on a bearing surface of the second structural component.

[0013] Preferably, the illumination light beam is adapted to be incident on the light diffusion component along an incident direction, and the first temperature sensing element and the second temperature sensing element are located on the same side of the wavelength conversion element in the incident direction.

[0014] The present invention also provides a projection device, comprising: the light source module as described above; a light valve, adapted to convert the illumination light beam from the light source module into an image light beam; and a projection lens, adapted to project the image light beam.

[0015] Compared with the prior art, the embodiment of the present invention provides a projection device and a light source module. In the light source module of the present invention, a first temperature sensing element corresponding to the light diffusion component is arranged on the first structural member. Accordingly, when the optical element in the light source module is broken and the light beam passing through the light diffusion component is abnormally irradiated to the first structural member in large quantities, the first temperature sensing element can sense the abnormal temperature rise of the first structural member, and then immediately shut down the light emitting element to avoid the light hazard problem caused by the breakage of the optical element. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. 1 is a schematic diagram of a projection device according to an embodiment of the present invention.

[0017] Figure 2 yes Figure 1 A three-dimensional diagram of the projection device.

[0018] Figure 3 yes Figure 2 A cross-sectional view of the local structure of the projection device along line II. DETAILED DESCRIPTION

[0019] In order to provide a further understanding of the purpose, structure, features and functions of the present invention, the following detailed description is given in conjunction with the embodiments.

[0020] Figure 1 is a schematic diagram of a projection device according to an embodiment of the present invention. Figure 1 The projection device 100 of this embodiment includes a light source module 110, a light valve 120 and a projection lens 130. The light source module 110 is adapted to emit an illumination beam L1, the light valve 120 is adapted to convert the illumination beam L1 from the light source module 110 into an image beam L2, and the projection lens 130 is adapted to project the image beam L2.

[0021] In this embodiment, the projection device 100 is at least a part of a car lamp, and the light source module 110 is the light source of the car lamp. Specifically, the projection device 100 can be a micro-projection device and can be used with the Adaptive Driving Beam (ADB) technology as a car lamp to project driving information. In other embodiments, the projection device 100 can be other types of projection equipment, and the present invention is not limited to this.

[0022] Figure 2 yes Figure 1 A three-dimensional diagram of the projection device. Figure 3 yes Figure 2 The cross-sectional view of the partial structure of the projection device along line II. Please refer to Figure 2 and Figure 3 The light source module 110 of this embodiment includes a light emitting element 112, a light diffusion component 114, a semi-transmissive semi-reflective element 117 and a wavelength conversion element 111. The light emitting element 112 is, for example, a blue laser source and is suitable for emitting blue light (i.e. Figure 1 The wavelength conversion element 111, the semi-transmissive and semi-reflective element 117 and the light diffusion element 114 are located on the transmission path of the illumination beam L1.

[0023] Specifically, a portion of the blue light emitted by the light emitting element 112 is reflected by the semi-transmissive semi-reflective element 117 to the wavelength conversion element 111, and the wavelength conversion element 111 is suitable for converting the wavelength of the illumination light beam L1. For example, the wavelength conversion element 111 can be a fluorescent wheel and is used to convert the received blue light into yellow light and then transmit it to the semi-transmissive semi-reflective element 111. The yellow light is transmitted to the light valve 120 through the semi-transmissive semi-reflective element 111.

[0024] Another part of the blue light emitted by the light emitting element 112 reaches the light diffusion element 114 through the semi-transmissive semi-reflective element 117, and is diffused by the light diffusion element 114 and then transmitted to the semi-transmissive semi-reflective element 117. The blue light is reflected by the semi-transmissive semi-reflective element 117 and transmitted to the light valve 120. The blue light and the yellow light transmitted to the light valve 120 are combined into white light. The light valve 120 is, for example, a digital micromirror device (DMD) or other types of light valve components, which are used to convert the white light into Figure 1 The image beam L2 is shown and transmitted to the projection lens 130 .

[0025] The light source module 110 of the present embodiment further includes a first structural member 116, a second structural member 113, a first temperature sensing element 118, and a second temperature sensing element 115. The light diffusion component 114 has a first front end 114a and a first rear end 114b opposite to each other. The first front end 114a of the light diffusion component 114 faces the light emitting component 112, and the first rear end 114b of the light diffusion component 114 faces the first structural member 116. The first temperature sensing element 118 is disposed on the first structural member 116 and corresponds to the light diffusion component 114. The wavelength conversion element 111 has a second front end 111a and a second rear end 111b opposite to each other. The second front end 111a of the wavelength conversion element 111 faces the space between the light emitting component 112 and the light diffusion component 114, and the second rear end 111b of the wavelength conversion element 111 faces the second structural member 113. The second temperature sensing element 115 is disposed on the second structural member 113 and corresponds to the wavelength conversion element 111.

[0026] As described above, in the light source module 110 of the present embodiment, the first temperature sensing element 118 corresponding to the light diffusion component 114 is disposed on the first structure 116, and the second temperature sensing element 115 corresponding to the wavelength conversion element 111 is disposed on the second structure 113. Accordingly, when the optical element (such as the semi-transmissive and semi-reflective element 117, the lens and reflector in the light diffusion component 114 and / or the lens in the wavelength conversion element 111) in the light source module 110 is broken, so that the light beam passing through the light diffusion component 114 is abnormally irradiated to the first structure 1166 in large quantities and / or the light beam passing through the wavelength conversion element 111 is abnormally irradiated to the second structure 113 in large quantities, the first temperature sensing element 118 can sense the abnormal temperature rise of the first structure 116 and the second temperature sensing element 115 can sense the abnormal temperature rise of the second structure 113, and then the power control board 140 can immediately shut down the power of the light emitting element 112 to avoid the light hazard problem caused by the breakage of the optical element. In other embodiments, only the first temperature sensing element 118 may be configured without the second temperature sensing element 115 , and the present invention is not limited thereto.

[0027] The first structural member 116 of the present embodiment is, for example, a metal plate installed behind the light diffusion component 114 and has a first surface 116a and a second surface 116b opposite to each other, the first surface 116a faces the light diffusion component 114, and the first temperature sensing element 118 is disposed on the second surface 116b. In addition, the second structural member 113 of the present embodiment is, for example, a heat sink (such as a heat sink fin group) corresponding to the wavelength conversion element 111, and the wavelength conversion element 111 and the second temperature sensing element 115 are disposed on the supporting surface on the same side of the second structural member 113. However, the present invention is not limited thereto, and in other embodiments, the first structural member 116 and the second structural member 113 may be other types of structures, respectively, and the first temperature sensing element 118 and the second temperature sensing element 115 may be disposed at other positions on the first structural member 116 and the second structural member 113, respectively.

[0028] In this embodiment, the illumination light beam L1 (shown in FIG. 1 ) emitted by the light emitting element 112 Figure 1 ) is suitable for the incident direction D (marked at Figure 3 ) is incident on the light diffusion component 114. When viewed along the incident direction D, the first temperature sensing element 118 overlaps the light diffusion component 114. In addition, the distance between the first structural member 116 and the light diffusion component 114 is smaller than the distance between the light diffusion component 114 and the light emitting element 112. Accordingly, the first temperature sensing element 118 can reliably sense the aforementioned abnormal temperature rise at the first structural member 116 adjacent to the light diffusion component 114.

[0029] like Figure 3 As shown in FIG. 1 , in this embodiment, the first temperature sensing element 118 and the second temperature sensing element 115 are located on the same side of the wavelength conversion element 111 in the incident direction D. Figure 2 As shown, a line 150 connected between the first temperature sensing element 118 / the second temperature sensing element 115 and the power control board 140 is conveniently provided.

[0030] The first temperature sensing element 118 and the second temperature sensing element 115 of this embodiment may be negative temperature coefficient (NTC) thermistors, but the present invention is not limited thereto. In other embodiments, the first temperature sensing element 118 and the second temperature sensing element 115 may be other types of temperature sensing elements.

[0031] In summary, the present invention provides a light source module and a projection device, wherein the light source module includes a light emitting element, a light diffusion component, a first structural member, and a first temperature sensing element, wherein the light emitting element is suitable for emitting an illumination light beam; the light diffusion component is suitable for diffusing the illumination light beam, wherein the light diffusion component has a first front end and a first rear end opposite to each other, the first front end of the light diffusion component faces the light emitting element, and the first rear end of the light diffusion component faces the first structural member; and the first temperature sensing element is arranged on the first structural member and corresponds to the light diffusion component. In the light source module of the present invention, a first temperature sensing element corresponding to the light diffusion component is arranged on the first structural member, and a second temperature sensing element corresponding to the wavelength conversion element is arranged on the second structural member. Accordingly, when the optical element in the light source module is broken and the light beam passing through the light diffusion component is abnormally irradiated to the first structural member in large quantities and / or the light beam passing through the wavelength conversion element is abnormally irradiated to the second structural member in large quantities, the first temperature sensing element can sense the abnormal temperature rise of the first structural member and the second temperature sensing element can sense the abnormal temperature rise of the second structural member, thereby immediately shutting down the light emitting element to avoid the light hazard problem caused by the breakage of the optical element.

[0032] Although the present invention is described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to exemplify the preferred embodiments of the present invention and should not be construed as limiting the present invention. In order to clearly describe the required components, the proportions in the schematic drawings do not represent the proportional relationship of the actual components.

[0033] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. A light source module, characterized in that: include: A light emitting element, adapted to emit a light beam; A light diffusion component, adapted to diffuse the illumination light beam, wherein the light diffusion component has a first front end and a first rear end opposite to each other, and the first front end of the light diffusion component faces the light emitting element; A first structural member, wherein the first rear end of the light diffusion component faces the first structural member; as well as The first temperature sensing element is disposed on the first structure and corresponds to the light diffusion component.

2. The light source module according to claim 1, characterized in that: The illumination light beam is suitable for incident on the light diffusion component along an incident direction. When observed along the incident direction, the first temperature sensing element overlaps the light diffusion component.

3. The light source module according to claim 1, characterized in that: The distance between the first structure and the light diffusion component is smaller than the distance between the light diffusion component and the light emitting element.

4. The light source module according to claim 1, characterized in that: The first structural member is a metal plate body.

5. The light source module according to claim 1, characterized in that: The first structural component has a first surface and a second surface opposite to each other. The first surface faces the light diffusion component, and the first temperature sensing element is disposed on the second surface.

6. The light source module according to claim 1, characterized in that: It also includes a wavelength conversion element, a second structural member and a second temperature sensing element, wherein the wavelength conversion element is suitable for converting the wavelength of the illumination light beam, the wavelength conversion element has a second front end and a second rear end relative to each other, the second front end of the wavelength conversion element faces the space between the light-emitting element and the light diffusion component, the second rear end of the wavelength conversion element faces the second structural member, and the second temperature sensing element is configured on the second structural member and corresponds to the wavelength conversion element.

7. The light source module according to claim 6, characterized in that: It also includes a semi-transmissive and semi-reflective element, wherein the semi-transmissive and semi-reflective element is located on the transmission path of the illumination light beam, a portion of the illumination light beam is reflected by the semi-transmissive and semi-reflective element to the wavelength conversion element, and another portion of the illumination light beam passes through the semi-transmissive and semi-reflective element to reach the light diffusion component.

8. The light source module according to claim 6, characterized in that: The wavelength conversion element and the second temperature sensing element are disposed on the supporting surface of the second structural component.

9. The light source module according to claim 6, characterized in that: The illumination light beam is suitable for incident on the light diffusion component along an incident direction. The first temperature sensing element and the second temperature sensing element are located at the same side of the wavelength conversion element in the incident direction.

10. A projection device, characterized in that: include: The light source module according to any one of claims 1 to 9; A light valve, adapted to convert the illumination light beam from the light source module into an image light beam; as well as The projection lens is suitable for projecting the image light beam.

11. The projection device according to claim 10, characterized in that: The light source module is the light source of the vehicle lamp.

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