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. 19, 2008
Filed:
Dec. 19, 2003
Hiroshi Kubota, Nagano, JP;
Hiroshi Sakai, Nagano, JP;
Hiroshi Kubota, Nagano, JP;
Hiroshi Sakai, Nagano, JP;
Nidec Sankyo Corporation, Nagano, JP;
Abstract
An optical head device including a photo detector and an optical system which converges a laser beam emitted by a laser light source onto an optical recording medium and also guides a returning beam from the optical recording medium to the photo detector. The optical head device further includes a base on which the laser light and the photo detector are mounted. An optical element is mounted on the base via an optical element holder which has the same linear expansion coefficient as that of the base and is fixed with adhesive directly to the base. The optical element is fixed on a surface which is perpendicular to a device optical axis of the element holder.