# US 2026/0063979 A1 · Light source device and projector > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0063979 A1 - Document ID: US20260063979A1 - Status: Published application - Kind: A1 - Application number: 19/314,637 - Filed: 2025-08-29 - Published: 2026-03-05 - Earliest claimed: 2024-09-02 - Assignees: Seiko Epson Corporation - Applicants: Seiko Epson Corporation - Inventors: Ryota TAKAI - Web page: https://patentgrep.com/patent/US20260063979A1 ## CPC - G03B 21/16: Cooling; Preventing overheating - G03B 21/204: {using secondary light emission, e.g. luminescence or fluorescence (using different colours G03B33/00; if related to video signals H04N9/3197)} - G03B 21/208: {Homogenising, shaping of the illumination light} - G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) ## Abstract A light source device according to an aspect of the present disclosure includes a light source unit including a light emitting element configured to emit light, a light guide member on which the light emitted from the light emitting element is made incident, the light guide member emitting the light, and a support member configured to support the light guide member. The support member includes a support surface facing a first direction intersecting a longitudinal direction, which is a direction in which the light guide member extends, and configured to support the light guide member, a heat transfer member extending in a second direction intersecting the longitudinal direction, and a holding section configured to hold the heat transfer member, the heat transfer member is disposed on the inside of the holding section, and the thermal conductivity of the heat transfer member is higher than the thermal conductivity of the holding section. ## Claims ### Claim 1 A light source device comprising: a light source unit including a light emitting element configured to emit light; a light guide member on which the light emitted from the light emitting element is made incident, the light guide member emitting the light; and a support member configured to support the light guide member, wherein the support member includes: a support surface facing a first direction intersecting a longitudinal direction, which is a direction in which the light guide member extends, and configured to support the light guide member; a heat transfer member extending in a second direction intersecting the longitudinal direction; and a holding section configured to hold the heat transfer member, the heat transfer member is disposed on an inside of the holding section, and thermal conductivity of the heat transfer member is higher than thermal conductivity of the holding section. ### Claim 2 (depends on 1) The light source device according to claim 1, wherein the second direction is a direction intersecting both of the longitudinal direction and the first direction. ### Claim 3 (depends on 1) The light source device according to claim 1, wherein the second direction is a direction inclined from the longitudinal direction to the first direction. ### Claim 4 (depends on 1) The light source device according to claim 1, wherein at least a part of the heat transfer member overlaps the light guide member when viewed from the first direction. ### Claim 5 (depends on 1) The light source device according to claim 1, wherein the heat transfer member has a columnar shape or a tubular shape extending in the second direction. ### Claim 6 (depends on 1) The light source device according to claim 1, wherein the heat transfer member is a tubular heat pipe extending in the second direction. ### Claim 7 (depends on 1) The light source device according to claim 1, wherein the support member includes a plurality of the heat transfer members, and the plurality of heat transfer members are disposed in the longitudinal direction. ### Claim 8 (depends on 1) The light source device according to claim 1, wherein the heat transfer member is a plate-shaped vapor chamber spreading in a direction intersecting the first direction. ### Claim 9 (depends on 8) The light source device according to claim 8, wherein a plate surface of the heat transfer member faces the first direction, and the support surface includes a surface facing the first direction among outer surfaces of the heat transfer member. ### Claim 10 (depends on 1) The light source device according to claim 1, further comprising a pressing member that presses the light guide member against the support surface, wherein a portion of the light guide member pressed by the pressing member overlaps the heat transfer member when viewed from the first direction. ### Claim 11 (depends on 10) The light source device according to claim 10, wherein the light source device comprises a plurality of the pressing members disposed spaced apart in the longitudinal direction, the support member includes a plurality of fixed sections disposed spaced apart in the longitudinal direction, the plurality of pressing members are respectively fixed to the fixed sections different from one another, and at least parts of the heat transfer member are disposed among the plurality of fixed sections in the longitudinal direction. ### Claim 12 (depends on 1) The light source device according to claim 1, wherein the holding section includes a first holding section including the support surface and a second holding section configured to hold the first holding section, and the heat transfer member is disposed on an inside of the second holding section. ### Claim 13 (depends on 1) The light source device according to claim 1, further comprising a heat sink attached to a surface facing a side opposite to the support surface among outer surfaces of the holding section. ### Claim 14 (depends on 1) The light source device according to claim 1, wherein the light emitting element emits first light having a first wavelength band, and the light guide member is a wavelength conversion member that includes a phosphor, converts the first light into second light having a second wavelength band different from the first wavelength band, and emits the second light. ### Claim 15 (depends on 1) A projector comprising: the light source device according to claim 1; a light modulation device configured to modulate light emitted from the light source device; and a projection optical device configured to project the light modulated by the light modulation device.