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:
Nov. 12, 2013
Filed:
Dec. 10, 2012
Chikara Tanioka, Yokohama, JP;
Kazuo Watabe, Yokohama, JP;
Hideaki Okano, Yokohama, JP;
Akihito Ogawa, Fujisawa, JP;
Takashi Usui, Saitama, JP;
Kazuaki Doi, Kawasaki, JP;
Chikara Tanioka, Yokohama, JP;
Kazuo Watabe, Yokohama, JP;
Hideaki Okano, Yokohama, JP;
Akihito Ogawa, Fujisawa, JP;
Takashi Usui, Saitama, JP;
Kazuaki Doi, Kawasaki, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
According to one embodiment, an optical pickup configured to record and to reproduce on a layer of a disk, including, a light source configured to emit a laser beam, an objective lens including a variable use magnification and configured to focus the laser beam on the layer, a collimator lens configured to change the magnification of the objective lens by moving along an optical axis direction, and a liquid crystal module configured to generate spherical aberration to cancel a coma aberration which may occur because an object point and an image point of the objective lens at the use magnification do not exist on an optical axis of the objective lens.