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:
Aug. 19, 1986
Filed:
Dec. 27, 1983
Applicant:
Inventor:
Christer Ovren, Vaster.ang.s, SE;
Assignee:
ASEA Aktiebolag, Vaster.ang.s, SE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01D / ; G02B / ; H01J / ;
U.S. Cl.
CPC ...
250216 ; 250227 ; 2502 / ; 313499 ;
Abstract
A light-generating element, for example an LED, a semiconductor laser or a body of photoluminescent material is arranged to have a temperature-independent output power characteristic by providing it with an optical filter having such a frequency-dependent transmission curve that the amplitude of the signal, emitted by the element, is, after passage through the filter, substantially independent of the temperature of the element.