# US 2019/0316768 A1 · Lighting device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0316768 A1 - Document ID: US20190316768A1 - Status: Published application - Kind: A1 - Application number: 16/379,171 - Filed: 2019-04-09 - Published: 2019-10-17 - Earliest claimed: 2018-04-11 - Assignees: Canon Kabushiki Kaisha - Applicants: Canon Kabushiki Kaisha - Inventors: Keiichiro Saito; Yutaka Yamamoto; Toshiki Miyakawa - Web page: https://patentgrep.com/patent/US20190316768A1 ## CPC - F21V 29/67: characterised by the arrangement of fans - G03B 15/05: Combinations of cameras with electronic flash apparatus; Electronic flash units - F21V 5/045: {the lens having discontinuous faces, e.g. Fresnel lenses} - F21V 13/02: Combinations of only two kinds of elements - F21V 14/02: by movement of light sources {(in vehicle head lamps F21S41/657)} - F21V 29/503: of light sources (cooling arrangements structurally associated with gas-discharge or vapour-discharge lamps H01J61/52; cooling arrangements structurally associated with electric incandescent lamps H01K1/58; cooling arrangements structurally associated with light-emitting diodes H10H20/858) - F21V 29/504: of refractors - F21V 29/506: of globes, bowls or cover glasses - G03B 17/55: with provision for heating or cooling, e.g. in aircraft - F21V 23/003: {the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array} - F21V 23/02: the elements being transformers, impedances {or power supply units, e.g. a transformer with a rectifier} - F21Y 2115/10: Light-emitting diodes [LED] - G03B 2215/0517: Housing - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - 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) - F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED ## Abstract A lighting device that protects a member related to light emission from heat associated with light emission includes a light source, a first optical member configured to transmit light emitted by the light source, a second optical member, arranged between the light source and the first optical member, configured to transmit light emitted by the light source, and an air-sending mechanism configured to send air suctioned from a first space that is an inner space on a side nearer to the light source than the second optical member and includes the light source to a second space that is a space between the first optical member and the second optical member. ## Claims ### Claim 1 A lighting device comprising: a light source; a first optical member configured to transmit light emitted by the light source; a second optical member, arranged between the light source and the first optical member, configured to transmit light emitted by the light source; and an air-movement mechanism configured to move air from a first space to a second space, the first space being an inner space of the lighting device that includes the light source and is arranged towards a side of the device that is nearer to the light source than the second optical member and, the second space being a space between the first optical member and the second optical member. ### Claim 2 (depends on 1) The lighting device according to claim 1, wherein the first optical member is an optical lens that changes distribution of the light emitted by the light source. ### Claim 3 (depends on 1) The lighting device according to claim 1, wherein the second optical member is arranged with a predetermined distance from the first optical member in an irradiation optical axis direction of the lighting device. ### Claim 4 (depends on 1) The lighting device according to claim 1, further comprising a driving mechanism configured to change a relative position of the light source to the first optical member in the irradiation optical axis direction of the lighting device, wherein, if the relative position of the light source to the first optical member in the irradiation optical axis direction is changed by the drive mechanism, a relative position of the first optical member to the second optical member in the irradiation optical axis direction is not changed. ### Claim 5 (depends on 1) The lighting device according to claim 1, wherein air-movement mechanism is configured to move air to the second space by moving air in a direction perpendicular to a longitudinal direction of the light source. ### Claim 6 (depends on 1) The lighting device according to claim 1, wherein the air-movement mechanism is arranged such that a longitudinal direction of an air-moving port of the air-movement mechanism is a same direction as a longitudinal direction of the light source. ### Claim 7 (depends on 1) The lighting device according to claim 1, wherein the air having flowed through the second space is exhausted to the first space. ### Claim 8 (depends on 1) The lighting device according to claim 1, wherein the air having flowed through the second space passes through a flow path arranged along the second space and is exhausted to an outside of the lighting device. ### Claim 9 (depends on 8) The lighting device according to claim 8, further comprising a second air-movement mechanism configured to send the air having flowed through the second space to the outside of the lighting device. ### Claim 10 (depends on 1) The lighting device according to claim 1, further comprising a heat radiation unit thermally connected to the air-movement mechanism. ### Claim 11 (depends on 1) The lighting device according to claim 1, wherein the air-movement mechanism includes a fan. ### Claim 12 (depends on 11) The lighting device according to claim 11, wherein the air-movement mechanism includes a blower fan. ### Claim 13 (depends on 1) The lighting device according to claim 1, wherein the air-movement mechanism is arranged on one side of the light source, and a storage unit is arranged on an other side of the light source, wherein the storage unit is configured to store a third optical member for changing distribution of light emitted from the first optical member in a drawable and retractable manner. ### Claim 14 (depends on 1) The lighting device according to claim 1, further comprising: a light emitting diode (LED); an LED substrate on which the LED is mounted; and an LED heat radiation unit thermally connected to the LED substrate, wherein a flow path of air sent from the air-sending mechanism is formed by using one portion of the LED heat radiation unit.