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. 05, 1996
Filed:
Jun. 15, 1994
Applicant:
Inventors:
Hiroyuki Saito, Yotsukaido, JP;
Akira Ito, Yotsukaido, JP;
Assignee:
Seiko Precision Inc., , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
2502016 ; 2502014 ; 396106 ;
Abstract
A distance measuring device for a camera projects a pulsed light beam toward a subject and converts the reflected light from the subject to a voltage which is integrated by an integrating circuit. The output of the integrating circuit is compared with a first reference voltage until the level thereof exceeds the first reference voltage, and then the output of the integrated circuit is compared with a second reference voltage until the level thereof reaches the second reference voltage. The distance to the subject is calculated depending on the number of times the integration operation is performed.