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:
Apr. 23, 2013
Filed:
Jan. 26, 2010
Hideki Nakata, Kyoto, JP;
Kousei Sano, Osaka, JP;
Takashi Haruguchi, Fukuoka, JP;
Osamu Kajino, Osaka, JP;
Hideki Nakata, Kyoto, JP;
Kousei Sano, Osaka, JP;
Takashi Haruguchi, Fukuoka, JP;
Osamu Kajino, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An optical headcomprises: a light sourcethat emits a light beam; an objective lensthat condenses, in the form of converging light, the light beam emitted by the light source, onto an information recording medium; a cylindrical lensonto which a reflected light beam that is reflected by the information recording medium is incident, and which generates astigmatism for forming a focus error signal; a light detectorthat receives the reflected light beam passing through the cylindrical lens; and a holderthat holds the cylindrical lensand the light detector. The holderhas a first main face and a second main face that extend in directions that intersect the optical axis of the reflected light beam. The cylindrical lensis bonded to the first main face and the light detectoris bonded to the second main face.