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:
Aug. 07, 2012
Filed:
Oct. 04, 2006
Makoto Sato, Tsurugashima, JP;
Masakazu Ogasawara, Tsurugashima, JP;
Takuma Yanagisawa, Tsurugashima, JP;
Makoto Sato, Tsurugashima, JP;
Masakazu Ogasawara, Tsurugashima, JP;
Takuma Yanagisawa, Tsurugashima, JP;
Pioneer Corporation, Tokyo, JP;
Abstract
A pickup device comprising an irradiation optical system including an objective lens to focus a ray bundle on a track of a recording surface of an optical recording medium to form a light spot, and a detection optical system including a photo detector to receive return light reflected from the light spot via the objective lens and perform photoelectric conversion and controls said objective lens in position according to electrical signals produced through operations on outputs of said photo detector.