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, 2005
Filed:
Jan. 16, 2003
Applicants:
Akifumi Yamaguchi, Kashiba, JP;
Hisakazu Sugiyama, Nara-ken, JP;
Inventors:
Akifumi Yamaguchi, Kashiba, JP;
Hisakazu Sugiyama, Nara-ken, JP;
Assignee:
Sharp Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01P003/36 ;
U.S. Cl.
CPC ...
Abstract
In an optical movement detecting device, two semiconductor lasers irradiate an object with respective light beams to form two light spots on the object. Two light-receiving elements receive the two light beams reflected from the two light spots respectively and traveling in a predetermined direction. Based on a difference in phase between two signals S, Soutputted from the two light-receiving elements, a signal processor derives a movement speed of the object.