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:
Feb. 22, 2000
Filed:
Dec. 23, 1998
Applicant:
Inventors:
Yoichi Seki, Yotsukaido, JP;
Shinichi Endo, Yotsukaido, JP;
Assignee:
Seiko Precision Inc., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ; G01J / ;
U.S. Cl.
CPC ...
396165 ; 396206 ; 356218 ; 2502 / ;
Abstract
A light measuring apparatus comprises an oscillation circuit, a first delaying circuit for delaying an output waveform of the oscillation circuit in accordance with a peripheral brightness, a second delaying circuit for delaying an output waveform of the oscillation circuit for a predetermined period of time, and a brightness judging circuit for judging a peripheral brightness in accordance with outputs of the first and second delaying circuits.