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:
Jun. 26, 2012
Filed:
Nov. 06, 2009
Tsutomu Ishimoto, Tokyo, JP;
Tsutomu Ishimoto, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
A movement speed of a lens included in an optical pickup is calculated by differentiating a total reflection return light quantity that is detected by emitting laser light and near-field light onto a signal recording surface of a rotationally driven optical disc. On the basis of the calculated movement speed, processing for driving the optical pickup or the lens included in the optical pickup is controlled. For example, in a case where the calculated movement speed exceeds a permissible speed set in advance, retreat processing is performed for moving the optical pickup or the lens included in the optical pickup apart from a surface of the optical disc.