# US 8,540,377 B2 · Projector light source device having projections regulating cooling airflow > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,540,377 B2 - Document ID: US8540377B2 - Status: Granted - Kind: B2 - Application number: 12/723,877 - Filed: 2010-03-15 - Published: 2010-09-16 - Granted: 2013-09-24 - Earliest claimed: 2009-03-16 - Assignees: Seiko Epson Corporation - Applicants: Takuji Kawai - Inventors: Takuji Kawai - Web page: https://patentgrep.com/patent/US8540377B2 ## CPC - G03B 21/16: Cooling; Preventing overheating - 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, includes: an arc tube having a tube spherical portion containing a pair of electrodes disposed along an illumination axis, and a pair of sealing portions extending from both sides of the tube spherical portion; a reflector having a reflection portion disposed in the vicinity of one of the sealing portions of the arc tube for reflecting light emitted from the arc tube toward an illumination area; and a flow regulating unit including a plurality of projecting portions projecting in a direction approximately along the illumination axis to regulate the flow direction of cooling air, and a fixing portion for fixing the plural projecting portions to one of the sealing portions in the vicinity of the tube spherical portion. ## Claims ### Claim 1 A light source device, comprising: an arc tube having a tube spherical portion containing a pair of electrodes disposed along an illumination axis, and a pair of sealing portions extending from both sides of the tube spherical portion; a reflector having a reflection portion disposed in a vicinity of one of the sealing portions of the arc tube for reflecting light emitted from the arc tube toward an illumination area; a flow regulating unit including: a plurality of projecting portions configured to regulate a flow direction of cooling air, each projecting portion of the plurality of projecting portions being configured to have a length extending along the illumination axis; and a fixing portion for fixing the plurality of projecting portions to one of the pair of sealing portions in a vicinity of the tube spherical portion, and an adhesive filled between the fixing portion and the one of the pair of sealing portions, wherein each of the plurality of projecting portions is disposed on a side of the fixing portion that is opposite to a side of the fixing portion on which the adhesive is disposed, and a virtual plane that passes through the illumination axis and extends along the length of the plurality of projecting portions is interposed between adjacent protecting portions of the plurality of projecting portions so that the adjacent projecting portions sandwich the virtual plane. ### Claim 2 (depends on 1) The light source device according to claim 1, wherein the virtual plane extends vertically in the direction of gravity. ### Claim 3 (depends on 2) The light source device according to claim 2, wherein the plurality of projecting portions are configured to be substantially symmetric with respect to the virtual plane. ### Claim 4 (depends on 1) The light source device according to claim 1, wherein each sealing portion is configured to be tubular, the one of the pair of sealing portions being inserted through the fixing portion. ### Claim 5 (depends on 1) The light source device according to claim 1, wherein the fixing portion is configured to have an inclined portion expanding toward the tube spherical portion along the illumination axis. ### Claim 6 (depends on 1) The light source device according to claim 1, wherein the flow regulating unit is set up in an area out of an effective optical path. ### Claim 7 (depends on 1) A projector, comprising: the light source device according to claim 1; and an optical modulation device configured to form an optical image by modulating light emitted from the light source device according to an image signal. ### Claim 8 (depends on 2) A projector, comprising: the light source device according to claim 2; and an optical modulation device configured to form an optical image by modulating light emitted from the light source device according to an image signal. ### Claim 9 (depends on 3) A projector, comprising: the light source device according to claim 3; and an optical modulation device configured to form an optical image by modulating light emitted from the light source device according to an image signal. ### Claim 10 (depends on 4) A projector, comprising: the light source device according to claim 4; and an optical modulation device configured to form an optical image by modulating light emitted from the light source device according to an image signal. ### Claim 11 (depends on 5) A projector, comprising: the light source device according to claim 5; and an optical modulation device configured to form an optical image by modulating light emitted from the light source device according to an image signal. ### Claim 12 (depends on 6) A projector, comprising: the light source device according to claim 6; and an optical modulation device configured to form an optical image by modulating light emitted from the light source device according to an image signal. ### Claim 13 (depends on 1) The light source device according to claim 1, wherein each of the projecting portions has a height extending in a direction perpendicular to the illumination axis and parallel to the virtual plane, and a width extending in a direction perpendicular to the virtual plane. ### Claim 14 (depends on 1) The light source device according to claim 1, wherein the length of each of the plurality of projecting portions is less than a length of the fixing portion extending along the illumination axis. ### Claim 15 (depends on 1) The light source device according to claim 1, wherein each of the plurality of projecting portions has a substantially triangular plate shape.