Patent · US Active

Optical observation unit and method for ensuring an unchanging illumination intensity when changing the color temperature of the illumination

US9829692B2 · kind B2 · utility

2Cited by

7References

16Claims

0Family size

Assignee

Carl Zeiss Meditec AG · DE

Inventors

Peter Reimer · Ellwangen, DE
Thomas Kratzer · Königsbronn, DE
Stefan Ernsperger · Ellwangen, DE
Bruno Stich · Aalen, DE

Key dates

Filing date	Apr 14, 2010
Grant date	Nov 28, 2017
Priority date	—
Expiry date	Aug 6, 2032

Classification

Technology area (CPC G)Physics
CPC primaryG02B5/28
WIPO fieldMedical technology
WIPO sectorInstruments

Abstract

An optical observation unit (1) has an illumination apparatus (43) for illuminating an observation object (3). The illumination apparatus (43, 143) has a light source (45) emitting illumination light with a first color temperature, and a spectral filter (49) that can be inserted in the illumination beam path. The spectral filter (49) converts the illumination light with the first color temperature into illumination light with a second color temperature. The illumination apparatus further has an attenuator (51) that can be inserted in the illumination beam path in place of the spectral filter (49) and has a transmission characteristic that leads to an intensity reduction of the illumination light with the first color temperature that corresponds to the intensity reduction of the illumination light with the second color temperature by way of the spectral filter (49).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.