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:
Jan. 08, 2008
Filed:
Jan. 05, 2005
Hideo Wada, Katsuragi, JP;
Nobuhisa Watanabe, Katsuragi, JP;
Takayuki Taminaga, Kitakatsuragi, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
In an optical movement information detector, light emitted from a laser diode () is split into a first beam (), a second beam () and a third beam () by beam splitters (). The first, second and third beams are converged by a condenser lens () upon a surface of an object to be measured () to form a beam spot () thereon. Diffused light from the beam spot () is received by a photodiode () and an output signal of the photodiode () is processed by a signal processing circuit () including an analog-digital converter () and a Fourier transforming unit (). A detecting section () obtains, for example, a moving velocity and a moving direction of the object based on spectrum peak frequencies obtained by the Fourier transform.