# US 8,783,885 B2 · Operating light and a process for lighting an operating table by means of an operating light > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,783,885 B2 - Document ID: US8783885B2 - Status: Granted - Kind: B2 - Application number: 13/183,801 - Filed: 2011-07-15 - Published: 2012-05-03 - Granted: 2014-07-22 - Earliest claimed: 2010-11-03 - Assignees: Dräger Medical GmbH - Applicants: Hanno Kretschmann; Christian Elsenbach; Patrick Wegner - Inventors: Hanno Kretschmann; Christian Elsenbach; Patrick Wegner - Web page: https://patentgrep.com/patent/US8783885B2 ## CPC - F21V 5/04: of lens shape - F21V 7/0091: {using total internal reflection} - G02B 19/0028: {refractive and reflective surfaces, e.g. non-imaging catadioptric systems} - G02B 19/0061: {the light source comprising a LED} - F21W 2131/205: for operating theatres - F21Y 2115/10: Light-emitting diodes [LED] - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - 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 An operating light (36) and a process are provided for lighting an operating table via an operating light (36). The operating light (36) includes at least one first radiation source (1), which is suitable for producing light (12) with locally different, especially radially outwardly decreasing color temperature distribution (18) in a plane extending at right angles to the work area. ## Claims ### Claim 1 An operating light comprising: a radiation source for producing light with a locally different color temperature distribution in a work area, in a plane parallel to a working surface, wherein said locally color temperature distribution has a radially outwardly dropping pattern with a plurality of radial areas of at least one of nearly constant, continuously changing and slightly decreasing color temperature, the plurality of radial areas comprising: a first area which covers an innermost part of the work area having a color temperature that is nearly constant and has a mean value between 4,500 K and 6,700 K; a second area, which adjoins the first area, the second area having a color temperature that decreases from an inside of the second area to an outside of the second area; and a third area, which adjoins the second area, said third area having a mean color temperature value between 3,000 K and 4,000 K. ### Claim 2 (depends on 1) An operating light in accordance with claim 1, wherein the color temperature in the first area changes by 600 K or less. ### Claim 3 (depends on 1) An operating light in accordance with claim 1, wherein the color temperature in the second area decreases from the inside of the second area to the outside of the second area by 1,000 K or more. ### Claim 4 (depends on 1) An operating light in accordance with claim 1, wherein the color temperature in the third area changes by 600 K or less. ### Claim 5 (depends on 1) An operating light in accordance with claim 1, wherein the first area covers a working position within the work area, wherein the lighting intensity is greater within the first area than outside the first area. ### Claim 6 (depends on 1) An operating light in accordance with claim 1, wherein a size of the first area is determined by a first area external diameter, at which the lighting intensity drops to 80% to 20% of a maximum first area lighting intensity. ### Claim 7 (depends on 1) An operating light in accordance with claim 1, wherein a size of the second area is determined by a second area external diameter, at which the lighting intensity has dropped to 15% to 5% of a maximum second area lighting intensity. ### Claim 8 (depends on 1) An operating light in accordance with claim 1, wherein: the radiation source comprises an LED chip with a phosphor converter applied in front of the LED chip in an emission direction; and said phosphor converter is larger than the LED chip in order to locally emit light with different color temperatures. ### Claim 9 (depends on 1) An operating light in accordance with claim 1, wherein the radiation source comprises an optical system for bundling and imaging a light emission, wherein said optical system is designed such that a local color temperature characteristic is preserved. ### Claim 10 (depends on 1) An operating light in accordance with claim 1, further comprising at least one additional radiation source to provide a plurality of different radiation sources, wherein homogeneous color temperatures of the radiation sources are superimposed by means of different focus diameters to the local color temperature pattern. ### Claim 11 (depends on 1) An operating light in accordance with claim 1, further comprising at least one additional radiation source to provide a plurality of radiation sources of a same type, wherein the radiation sources comprise a plurality of LED lens pairs with a radial color temperature pattern oriented towards a light spot at a defined working distance. ### Claim 12 (depends on 1) An operating light in accordance with claim 1, further comprising at least one additional radiation source to provide a plurality of radiation sources with a lighting means comprising one or more of halogen lights, gas discharge lights and LEDs. ### Claim 13 (depends on 1) An operating light in accordance with claim 1, further comprising at least one additional radiation source to provide a plurality of radiation sources, each of said radiation sources having a light filter and a reflector arranged one after another in a light body and each of said radiation sources produce a light spot with different, always homogeneous color temperature and different focus diameters at a same working distance on a common axis. ### Claim 14 (depends on 1) An operating light in accordance with claim 1, wherein: the first area has a color temperature mean value between 5,200 K and 6,000 K; and the third area has a mean color temperature value that is between 3,200 K and 3,900 K. ### Claim 15 (depends on 6) An operating light in accordance with claim 6, wherein the lighting intensity drops to 65% to 35% of the maximum at the first area external diameter. ### Claim 16 A process for lighting an operating table, the process comprising the steps of: providing an operating light with a radiation source; producing light with the radiation source, the light having a locally different color temperature distribution in a work area, in a plane parallel to a working surface, wherein said locally color temperature distribution has a radially outwardly decreasing pattern with a plurality of radial areas of at least one of nearly constant, continuously changing and slightly decreasing color temperature, the plurality of radial areas comprising: a first area which covers an innermost part of the work area having a color temperature that is nearly constant and has a mean value between 4,500 K and 6,700 K; a second area, which adjoins the first area, the second area having a color temperature that decreases from an inside of the second area to an outside of the second area; and a third area, which adjoins the second area, said third area having a mean color temperature value between 3,000 K and 4,000 K. ### Claim 17 (depends on 16) A process in accordance with claim 16, further comprising: producing a light spot with a radial color temperature pattern which has a nearly constant color temperature pattern in said first area and, adjoining same, and has a color temperature decreasing towards the edge of the light spot; and setting the color temperature pattern such that fatigue-free working is made possible during the operation of the operating light. ### Claim 18 (depends on 16) A process in accordance with claim 16, further comprising: using physiological light perception during the operation by an operating site being lit with a higher color temperature in order to make high concentration and low fatigue possible, and a lower color temperature is provided outside the operating site in order to create a quieter picture with a lower extent of overstimulation. ### Claim 19 An operating light for lighting a work area of a working surface of an operating table in an operating room, the operating light comprising: a radiation source producing light in the work area with a color temperature distribution that differs between local areas in a plane parallel to the working surface, the local areas of the color temperature distribution comprising: a first area covering an innermost part of the work area and having a color temperature that is nearly constant with a mean value between 4,500 K and 6,700 K; a second area adjacent to the first area and having a color temperature that decreases from an inside of the second area to an outside of the second area; and a third area adjacent to the second area and having a mean color temperature value between 3,000 K and 4,000 K. ### Claim 20 (depends on 19) An operating light in accordance with claim 19, wherein: the color temperature in the first area changes by 600 K or less; the color temperature in the second area decreases from the inside of the second area to the outside of the second area by 1,000 K or more; the color temperature in the third area changes by 600 K or less.