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:
Dec. 05, 2006
Filed:
Jul. 08, 2003
Kenji Nagashima, Takatsuki, JP;
Youichi Saitoh, Hirakata, JP;
Kenji Nagashima, Takatsuki, JP;
Youichi Saitoh, Hirakata, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An optical head by which a good detection signal can be obtained based on a zeroth-order diffracted beam and first-order diffracted beams is provided. The optical head includes: a shaping element for shaping a beam emitted from a light source; a converging element for converging the beam that has been shaped by the shaping element on an optical recoding medium; and a detector for detecting an electric signal based on a zeroth-order diffracted beam and a first-order diffracted beam contained in the beam that has been reflected by the optical recoding medium. The shaping element is provided in a swingable manner so that a distance between a spot position at which the zeroth-order diffracted beam is incident on the detector and a spot position at which the first-order diffracted beam is incident on the detector can be adjusted.