# US 10,502,393 B2 · Low-bulk optical collimator for generating a small spot of illumination > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,502,393 B2 - Document ID: US10502393B2 - Status: Granted - Kind: B2 - Application number: 15/765,878 - Filed: 2016-07-27 - Published: 2018-10-04 - Granted: 2019-12-10 - Earliest claimed: 2015-10-20 - Assignees: Maquet GmbH - Applicants: Maquet SAS - Inventors: Cecilia Valteau; Minh Hong Vu Thi; David Genevriere - Web page: https://patentgrep.com/patent/US10502393B2 ## CPC - F21V 7/0091: {using total internal reflection} - A61B 90/30: Devices for illuminating a surgical field, the devices having an interrelation with other surgical devices or with a surgical procedure - F21V 5/04: of lens shape - G02B 19/0028: {refractive and reflective surfaces, e.g. non-imaging catadioptric systems} - G02B 19/0061: {the light source comprising a LED} - G02B 27/30: Collimators - F21W 2131/205: for operating theatres - F21Y 2101/00: Point-like light sources - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - F21W: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS - 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 comprises a solid optical collimator (6′), the collimator comprises a truncated cap having an inside surface (10′) operating in total internal reflection and having a small base opening into a frustoconical through recess that is coaxial with the cap and at the centre of which a light source (8′) is placed, and having a refractive large base such that incident light emitted by the light source is guided in totality by the inside surface towards the large base of the cap. The recess of the collimator is disposed in the cap in such a manner as to have a small base open and coinciding with the small base of the cap. ## Claims ### Claim 1 A surgical lighting device forming an illumination spot, comprising: a lighting dome having a plurality of lighting devices, wherein each lighting device includes a solid optical collimator comprising a truncated cap having an inside surface operating in total internal reflection and having a small base opening into a frustoconical through recess that is coaxial with said cap and at the centre of which a light source is placed, and having a refractive large base such that incident light emitted by said light source is guided in totality by said inside surface towards said large base of said cap, and wherein said recess of said collimator is disposed in said cap in such a manner as to have a small base open and coinciding with said small base of said cap, and in that said collimators are directed to concentrate the light flux from said light sources onto said illumination spot that is centered on the illumination axis of said lighting dome. ### Claim 2 (depends on 1) The surgical lighting device according to claim 1, wherein said recess in said collimator opens out into said large base of said cap. ### Claim 3 (depends on 2) The surgical lighting device according to claim 2, wherein said recess comprises a frustoconical first recess having a small base open and coinciding with said small base of said cap, and a second coaxial recess under said first recess and, between the two recesses, an annular shoulder carries a screen for said incident light. ### Claim 4 (depends on 3) The surgical lighting device according to claim 3, wherein said screen is absorbent on its side closer to the light source. ### Claim 5 (depends on 3) The surgical lighting device according to claim 3, wherein said screen is diffusive on its side closer to the light source. ### Claim 6 (depends on 5) The surgical lighting device according to claim 5, wherein said screen is adhesively bonded to said shoulder. ### Claim 7 (depends on 3) The surgical lighting device according to claim 3, wherein said shoulder forms a plane surface that is perpendicular to the axis of said cap. ### Claim 8 (depends on 7) The surgical lighting device according to claim 7, wherein said collimator is rigid. ### Claim 9 (depends on 8) The surgical lighting device according to claim 8, wherein said collimator is made of injection-molded plastic. ### Claim 10 (depends on 9) The surgical lighting device according to claim 9, wherein said collimator is made of PMMA. ### Claim 11 (depends on 3) The surgical lighting device according to claim 3, wherein a support of the collimator includes means for fastening said screen for said incident light. ### Claim 12 (depends on 11) The surgical lighting device according to claim 11, wherein said light source is an LED. ### Claim 13 (depends on 3) The surgical lighting device according to claim 3, wherein said screen is adhesively bonded to said shoulder. ### Claim 14 (depends on 1) The surgical lighting device according to claim 1, wherein said collimator is rigid. ### Claim 15 (depends on 1) The surgical lighting device according to claim 1, wherein said collimator is made of injection-molded plastic. ### Claim 16 (depends on 1) The surgical lighting device according to claim 1, wherein said collimator is made of PMMA. ### Claim 17 (depends on 1) The surgical lighting device according claim 1, wherein said light source is an LED.