Patent ID: 9119668
Filing Date: 2015-09-01
Classification: A61B,F21S,F21V,F21W,F21Y

Abstract:
1. A surgical lamp for illuminating an operating site, comprising: a lamp body having an optical axis and comprising a first light source and a second light source that respectively generate a first light field and a second light field on the operating site, wherein the operating site is located at a particular distance from the lamp body, and the first and second light fields together produce a resultant light field, wherein the resultant light field has a circular shape and is associated with a light distribution that conforms with a surgical lamp standard, such that a preset relative central illuminance (Ecx) of the light distribution is generated at a predetermined diameter (dx) of the resultant light field; a control device configured to control a first light intensity of the first light source and a second light intensity of the second light source, such that the preset relative central illuminance (Ecx) is generated at the predetermined diameter (dx) at the particular distance; and a device for detecting a distance between the lamp body and the operating site, wherein the control device is configured to control the first and second light intensities of the first and second light sources, respectively, such that the predetermined diameter (dx) of the resultant light field on the operating site is maintained at a substantially constant value as the distance between the lamp body and the operating site changes, wherein the first and second light sources are respectively assigned to first and second groups of light sources according to one or more criteria comprising diameters of light fields generated by light sources within the first and second groups of light sources and distances of the light sources within the first and second groups of light sources from the optical axis, wherein the control device is configured such that the light sources within the first and second groups of light sources can be controlled similarly and such that the first and second groups of light sources can be controlled independently of one another, and wherein the control device comprises a storage that stores a mapping, and wherein light intensities of the light sources in the first and second groups of light sources are stored as values associated with currents in the mapping, such that the values are retrievable by the control device in a mixing ratio that depends on the distance between the lamp body and the operating site.