US-12625420-B2 - Light source device and projector

Abstract

A light source device includes a first laser emitter configured to emit first light, a light transmissive member having a first surface and a second surface, the first light emitted from the first laser emitter being incident on the second surface, a base having a first support part configured to support the first laser emitter and a second support part configured to support the light transmissive member, and a wavelength converter arranged on the first surface and configured to convert the first light into second light. The wavelength converter has an incident surface including an incident area where the first light enters and an emission surface disposed at an opposite side to the incident surface and configured to emit the second light. The second support part supports the second surface of the light transmissive member in an area corresponding to the incident area.

Inventors

• Chigusa Takagi
• Shoichi Uchiyama
• Tetsuo Shimizu
• Tomoko AKAGAWA
• Ryota Tatsumi

Assignees

• SEIKO EPSON CORPORATION

Dates

Publication Date

20260512

Application Date

20230328

Priority Date

20220328

Claims (16)

1. 1 . A light source device comprising: a first laser emitter configured to emit first light in a first wavelength band; a light transmissive member having a first surface and a second surface opposite to the first surface, the first light emitted from the first laser emitter being incident on the second surface; a base having a first support part configured to support the first laser emitter and a second support part configured to support the light transmissive member; and a wavelength converter arranged on the first surface of the light transmissive member and configured to convert the first light into second light in a second wavelength band different from the first wavelength band, wherein the wavelength converter has an incident surface including an incident area where the first light enters and an emission surface disposed at an opposite side to the incident surface and configured to emit the second light, and the second support part supports the second surface of the light transmissive member in an area corresponding to the incident area.
2. 2 . The light source device according to claim 1 , wherein an air layer is disposed between the incident surface of the wavelength converter and the first surface of the light transmissive member.
3. 3 . The light source device according to claim 2 , wherein an uneven structure is provided to one of the incident surface of the wavelength converter and an area, in the first surface of the light transmissive member, opposed to the incident surface, and the air layer is provided to the uneven structure.
4. 4 . The light source device according to claim 2 , further comprising: a spacer arranged between the incident surface of the wavelength converter and the first surface of the light transmissive member, wherein the air layer is disposed in a space formed by the spacer between the incident surface and the first surface.
5. 5 . The light source device according to claim 1 , further comprising: an optical element disposed at a light emitting side of the first laser emitter and facing the first laser emitter, the optical element being configured to fold a light path of the first light emitted from the first laser emitter toward the second surface of the light transmissive member.
6. 6 . The light source device according to claim 1 , further comprising: a first reflector arranged in an area different from the wavelength converter on the first surface; and a second reflector arranged between the second support part and the second surface of the light transmissive member, wherein the first reflector reflects the first light emitted from the first laser emitter toward the second reflector, and the second reflector reflects the first light reflected by the first reflector, toward the wavelength converter.
7. 7 . The light source device according to claim 6 , further comprising: a diffuser configured to diffuse the first light, wherein the diffuser is formed on at least one of a reflecting surface of the first reflector and a reflecting surface of the second reflector.
8. 8 . The light source device according to claim 1 , further comprising: a diffuser configured to diffuse the first light, wherein the diffuser is arranged in a light path of the first light from the first laser emitter to the incident surface of the wavelength converter.
9. 9 . The light source device according to claim 8 , wherein the diffuser is arranged at the second surface of the light transmissive member in an area where the first light emitted from the first laser emitter enters.
10. 10 . The light source device according to claim 8 , wherein the diffuser is arranged between the incident surface of the wavelength converter and the first surface of the light transmissive member.
11. 11 . The light source device according to claim 1 , further comprising: an optical layer arranged between the incident surface of the wavelength converter and the first surface of the light transmissive member and configured to transmit the first light and reflect the second light.
12. 12 . The light source device according to claim 1 , further comprising: a first optical system arranged between the first laser emitter and the light transmissive member and configured to collimate the first light emitted from the first laser emitter.
13. 13 . The light source device according to claim 12 , further comprising: a second laser emitter configured to emit the first light; and a second optical system configured to collimate the first light emitted from the second laser emitter, wherein the first optical system and the second optical system are separated from each other, and are arranged at a distance from each other.
14. 14 . The light source device according to claim 12 , further comprising: a second laser emitter configured to emit the first light; and a second optical system configured to collimate the first light emitted from the second laser emitter, wherein the first optical system and the second optical system are integrated into a single member.
15. 15 . The light source device according to claim 1 , wherein the second support part has a support surface configured to support the second surface of the light transmissive member, and the support surface is larger in area than the incident area of the wavelength converter.
16. 16 . A projector comprising: the light source device according to claim 1 ; a light modulation device configured to modulate the light emitted from the light source device; and a projection optical device configured to project the light modulated by the light modulation device.

Description

The present application is based on, and claims priority from JP Application Serial Number 2022-052359, filed Mar. 28, 2022, the disclosure of which is hereby incorporated by reference herein in its entirety. BACKGROUND 1. Technical Field The present disclosure relates to a light source device and a projector. 2. Related Art In the past, there has been a light source device which makes excitation light emitted from a laser element enter a wavelength converter from a reverse surface, and then emits fluorescence generated by the wavelength converter from an obverse surface of the wavelength converter (see, e.g., JP-A-2021-106299). In this light source device, a periphery of a transparent radiator substrate provided with the wavelength converter is supported with a radiator member shaped like a frame. The heat of the wavelength converter is released to the radiator member via a light transmissive member. However, in the light source device described above, since a radiation path from the wavelength converter to the radiation member is long, there is a problem that the temperature of the wavelength converter rises to thereby deteriorate luminous efficiency. SUMMARY In view of the problems described above, a light source device according to the present disclosure includes a first laser emitter configured to emit first light in a first wavelength band, a light transmissive member having a first surface and a second surface opposite to the first surface, the first light emitted from the first laser emitter being incident on the second surface, a base having a first support part configured to support the first laser emitter, and a second support part configured to support the light transmissive member, and a wavelength converter arranged on the first surface of the light transmissive member and configured to convert the first light into second light in a second wavelength band different from the first wavelength band. The wavelength converter has an incident surface including an incident area where the first light enters and an emission surface disposed at an opposite side to the incident surface and configured to emit the second light. The second support part supports the second surface of the light transmissive member in an area corresponding to the incident area. A projector according to the present disclosure includes the light source device described above, a light modulation device configured to modulate the light emitted from the light source device, and a projection optical device configured to project the light modulated by the light modulation device. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a schematic configuration of a projector according to a first embodiment. FIG. 2 is a schematic configuration diagram of an illumination device. FIG. 3 is a plan view of a light source device 20. FIG. 4 is a cross-sectional view according to an arrow view along the line IV-IV in FIG. 3. FIG. 5 is a cross-sectional view showing a configuration of an essential part of a wavelength converter. FIG. 6 is a diagram showing a configuration of a light source device according to a second embodiment. FIG. 7 is a diagram showing a configuration of a light source device according to a third embodiment. FIG. 8 is a diagram showing a configuration of a light source device according to a fourth embodiment. FIG. 9 is a diagram showing a configuration of a light source device according to a fifth embodiment. FIG. 10 is a diagram showing a configuration according to a modified example of the fifth embodiment. FIG. 11A is a diagram showing a configuration of an essential part of a light source device according to a first modified example. FIG. 11B is a diagram showing a configuration of an essential part of a light source device according to a second modified example. FIG. 11C is a diagram showing a configuration of an essential part of a light source device according to a third modified example. FIG. 11D is a diagram showing a configuration of an essential part of a light source device according to a fourth modified example. DESCRIPTION OF EXEMPLARY EMBODIMENTS Some embodiments of the present disclosure will hereinafter be described in detail with reference to the drawings. It should be noted that the drawings used in the following description show characteristic parts in an enlarged manner in some cases for the sake of convenience in order to make the features easy to understand, and the dimensional ratios between the constituents and so on are not necessarily the same as actual ones. First Embodiment An example of a projector according to the present embodiment will be described. FIG. 1 is a diagram showing a schematic configuration of the projector according to the present embodiment. As shown in FIG. 1, the projector 1 according to the present embodiment is a projection-type image display device for displaying a color image on a screen SCR. The projector 1 is provided with a color separation optical system 3, a