# US 10,481,478 B2 · Dust-proof case, light source unit and projector > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,481,478 B2 - Document ID: US10481478B2 - Status: Granted - Kind: B2 - Application number: 16/058,471 - Filed: 2018-08-08 - Published: 2019-03-28 - Granted: 2019-11-19 - Earliest claimed: 2017-09-26 - Assignees: Casio Computer Co., Ltd. - Applicants: Casio Computer Co., Ltd - Inventors: Osamu Jobi - Web page: https://patentgrep.com/patent/US10481478B2 ## CPC - G03B 21/20: Lamp housings - G03B 21/145: {Housing details, e.g. position adjustments thereof} - 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: 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 dust-proof case includes a case main body having a lid member resting surface that is formed on an outer circumferential portion and a wall portion that is formed on an outer circumferential side of the lid member resting surface, and a lid member having a lid member main body having a plurality of corner portions and an elastic portion that is in abutment with an inner surface of the wall portion that is formed on an outer circumference of the lid member main body and rested on the lid member resting surface, and the elastic portion includes the plurality of corner portions and a straight-line portion in a circumferential shape thereof, and a circumferential cross-sectional area of the elastic portion is narrower at the corner portion than at the straight-line portion. ## Claims ### Claim 1 A dust-proof case comprising: a case main body having a lid member resting surface that is formed on an outer circumferential portion and a wall portion that is formed on an outer circumferential side of the lid member resting surface; and a lid member having a lid member main body having a plurality of corner portions and an elastic portion that is in abutment with an inner surface of the wall portion that is formed on an outer circumference of the lid member main body and rested on the lid member resting surface, wherein the elastic portion includes the plurality of corner portions and a straight-line portion in a circumferential shape thereof, and wherein a circumferential cross-sectional area of the elastic portion is narrower at the corner portion than at the straight-line portion. ### Claim 2 (depends on 1) The dust-proof case according to claim 1, wherein an abutment portion where the inner surface of the wall portion is brought into abutment with the elastic portion is positioned more upwards than an outer circumferential end face portion of the lid member main body. ### Claim 3 (depends on 1) The dust-proof case according to claim 1, wherein a plurality of ribs or thick portions are formed on the straight-line portion of the elastic portion at predetermined intervals in a longitudinal direction of the straight-line portion. ### Claim 4 (depends on 2) The dust-proof case according to claim 2, wherein a plurality of ribs or thick portions are formed on the straight-line portion of the elastic portion at predetermined intervals in a longitudinal direction of the straight-line portion. ### Claim 5 (depends on 1) The dust-proof case according to claim 1, wherein the elastic portion has formed thereon a protuberant portion that protrudes outwards, and the protuberant portion is brought into abutment with the inner surface of the wall portion. ### Claim 6 (depends on 2) The dust-proof case according to claim 2, wherein the elastic portion has formed thereon a protuberant portion that protrudes outwards, and the protuberant portion is brought into abutment with the inner surface of the wall portion. ### Claim 7 (depends on 3) The dust-proof case according to claim 3, wherein the elastic portion has formed thereon a protuberant portion that protrudes outwards, and the protuberant portion is brought into abutment with the inner surface of the wall portion. ### Claim 8 (depends on 4) The dust-proof case according to claim 4, wherein the elastic portion has formed thereon a protuberant portion that protrudes outwards, and the protuberant portion is brought into abutment with the inner surface of the wall portion. ### Claim 9 (depends on 1) The dust-proof case according to claim 1, wherein a hole portion is formed in the lid member, and wherein a connecting elastic portion connecting to the elastic portion and having a projecting cross section is formed on an outer circumferential portion of the hole portion. ### Claim 10 (depends on 2) The dust-proof case according to claim 2, wherein a hole portion is formed in the lid member, and wherein a connecting elastic portion connecting to the elastic portion and having a projecting cross section is formed on an outer circumferential portion of the hole portion. ### Claim 11 (depends on 3) The dust-proof case according to claim 3, wherein a hole portion is formed in the lid member, and wherein a connecting elastic portion connecting to the elastic portion and having a projecting cross section is formed on an outer circumferential portion of the hole portion. ### Claim 12 (depends on 4) The dust-proof case according to claim 4, wherein a hole portion is formed in the lid member, and wherein a connecting elastic portion connecting to the elastic portion and having a projecting cross section is formed on an outer circumferential portion of the hole portion. ### Claim 13 (depends on 5) The dust-proof case according to claim 5, wherein a hole portion is formed in the lid member, and wherein a connecting elastic portion connecting to the elastic portion and having a projecting cross section is formed on an outer circumferential portion of the hole portion. ### Claim 14 (depends on 6) The dust-proof case according to claim 6, wherein a hole portion is formed in the lid member, and wherein a connecting elastic portion connecting to the elastic portion and having a projecting cross section is formed on an outer circumferential portion of the hole portion. ### Claim 15 (depends on 1) A light source unit comprising: the dust-proof case according to claim 1; a light source provided in an interior of the dust-proof case; and a light guiding optical system having a plurality of optical members and configured to guide light from the light source unit. ### Claim 16 (depends on 2) A light source unit comprising: the dust-proof case according to claim 2; a light source provided in an interior of the dust-proof case; and a light guiding optical system having a plurality of optical members and configured to guide light from the light source unit. ### Claim 17 (depends on 3) A light source unit comprising: the dust-proof case according to claim 3; a light source provided in an interior of the dust-proof case; and a light guiding optical system having a plurality of optical members and configured to guide light from the light source unit. ### Claim 18 (depends on 4) A light source unit comprising: the dust-proof case according to claim 4; a light source provided in an interior of the dust-proof case; and a light guiding optical system having a plurality of optical members and configured to guide light from the light source unit. ### Claim 19 (depends on 5) A light source unit comprising: the dust-proof case according to claim 5; a light source provided in an interior of the dust-proof case; and a light guiding optical system having a plurality of optical members and configured to guide light from the light source unit. ### Claim 20 (depends on 15) A projector comprising: the light source unit according to claim 15; a display device on to which light source light from the light source unit is shined to form image light; a projection-side optical system configured to project the image light emitted from the display device on to a screen; and a projector control unit configured to control the display device and the light source unit.