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. 18, 2007
Filed:
May. 27, 2004
Tetsu Tanaka, Tokyo, JP;
Tetsu Tanaka, Tokyo, JP;
Sony Corporation, , JP;
Abstract
An optical pickup apparatus is described which includes a movable unit with an objective lens, a focus servo coil for moving the moveable unit containing the objective lens in the optical-axis direction, and tracking servo coils for moving the moveable unit containing the objective lens in the horizontal directions, and a liquid crystal element disposed for correcting the refractive index. Springs simultaneously provide support for the moveable unit and feed power to the liquid crystal element, the focus servo coil, and the tracking servo coils. A method for making said optical pickup apparatus is described. Two sheets, each having four springs extending across an opening formed by punching, are disposed parallel to each other at a predetermined distance. On these sheets, a fixed unit and a movable unit are formed by insert-molding. Excess portions of the metal sheets are removed, and a through-hole is formed so that connected portions of the wirings, lying side by side, are disconnected. Then, an objective lens, a focus servo coil, tracking servo coils, and a liquid crystal element are mounted on the movable unit.