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:
Mar. 05, 1991
Filed:
May. 01, 1989
Applicant:
Inventors:
Yoshihara Unami, Tomisato, JP;
Masao Tanaka, Yachiyo, JP;
Assignee:
Fujikura Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01J / ;
U.S. Cl.
CPC ...
315151 ; 250205 ;
Abstract
An LED stabilizing light source device comprises an LED, a drive circuit for driving the LED, a wavelength filter for filtering the light emitted from the LED, a light splitter for splitting the light passing through the filter, a photodiode for receiving the split light. The device further comprises a feedback loop for feeding an output of the photodiode to the drive circuit.