The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 11, 1980
Filed:
Sep. 29, 1978
Applicant:
Inventors:
Willi Hagner, Solms, DE;
Horst Frimmel, Hermannstein, DE;
Assignee:
Ernst Leitz Wetzlar GmbH, , DE;
Primary Examiner:
Int. Cl.
CPC ...
F21V / ; G02B / ; F21V / ;
U.S. Cl.
CPC ...
362 32 ; 350206 ; 362283 ; 362322 ;
Abstract
Disclosed is a brightness control device for use with fiber optical lamps, comprising a diaphragm which is arranged unilaterally in the light beam between the lamp light source and the light entrance area of the fiber optical conductor. The diaphragm comprises a variable size diaphragm which is designed such that the cross-section of the light entrance area of the fiber optical conductor is asymmetrically and unilaterally reduced in order to maintain a constant lamp color temperature and emission characteristic.