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. 19, 2011
Filed:
Jun. 17, 2008
Hirotaka Miyamoto, Kanagawa, JP;
Jingcheng Yuan, Kanagawa, JP;
Hirotaka Miyamoto, Kanagawa, JP;
Jingcheng Yuan, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
An optical pickup includes: an objective lens that collects a first beam and a second beam and emits the first and second beam toward an optical information recording medium on which information can be recorded as a recording mark as a result of being exposed to the first beam; a section that drives the objective lens to focus the second beam on a reflection layer formed on the optical information recording medium, the reflection layer at least partly reflecting the second beam; and a section that changes the convergence state of the first beam to position a focal point of the first beam a distance away from a focal point of the second beam in the direction of depth in order to place the focal point of the first beam at a target depth.