Lighting device for forming an illumination spot of variable diameter and of variable color temperature

摘要

A lighting device comprises a first light source (10) at a first color temperature (Tk1), a second light source (20) at a second color temperature (Tk2) that is different from the first color temperature, and an optical system that forms an illumination spot (3) at an intermediate color temperature (Tkr). The optical system comprises a beam splitter (13) that is arranged to split the light produced by each light source (10, 20) into a transmitted light beam and a reflected light beam. It is arranged to focus said transmitted and reflective light beams (FR1, FR2) and to combine them in a certain superposition configuration in a superposition plane in which said illumination spot is formed, and the optical system and the light sources are arranged to modify the size of the illumination spot (3) at said intermediate temperature.

主权项

1. A lighting device for illuminating a medical operative field, the lighting device comprising:
a first white light source suitable for emitting a first light beam at a first color temperature; a second white light source suitable for emitting a second light beam at a second color temperature that is different from the first color temperature; and an optical system that uses the light from the light sources to form an illumination spot at an intermediate color temperature lying between the first color temperature and the second color temperature, said optical system comprises a fixed beam splitter arranged to split light produced by each of the first and second light sources into a transmitted light beam portion and a reflected light beam portion; wherein the optical system is arranged to focus the reflected second light beam portion of said first light beam together with the transmitted first light beam portion of said second light beam to form a first resulting beam having said intermediate color temperature, and to focus the transmitted first light beam portion of said first light beam together with the reflected second light beam portion of said second light beam to form a second resulting beam having said intermediate color temperature, and to combine said first resulting beam and said second resulting beam in a superposition configuration to form said illumination spot at said intermediate color temperature in a superposition plane of said medical operative field; and wherein said optical system and said light sources are arranged to modify the size of the illumination spot at said intermediate color temperature.