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:
Mar. 27, 2007
Filed:
Feb. 07, 2003
Atsushi Iida, Tokyo, JP;
Toshio Watanabe, Kanagawa, JP;
Hironobu Tanase, Kanagawa, JP;
Kenji Yamamoto, Kanagawa, JP;
Gakuji Hashimoto, Saitama, JP;
Atsushi Iida, Tokyo, JP;
Toshio Watanabe, Kanagawa, JP;
Hironobu Tanase, Kanagawa, JP;
Kenji Yamamoto, Kanagawa, JP;
Gakuji Hashimoto, Saitama, JP;
Sony Corporation, , JP;
Abstract
An optical head enabling a size reduction so that the optical head can be stored in an opening of a cartridge for a disk and enabling an improvement in the dynamic performance as the density and transfer rate are increased is provided. In a two-axis actuator optical head capable of driving an objective lens () along the Z axis in the focus direction, that is, vertical to the surface of the optical disk and along the X axis in the tracking direction, that is, the radial direction of the optical disk. The objective lens () is disposed in the center of the coil bobbin (), a focusing coil () is disposed around the coil bobbin () and is wound around the X axis, and tracking coils (and) are disposed on both ends of the coil bobbin () in the X axis direction and are wound around the X axis. Pairs of magnets (to) are disposed plane-symmetrically with the Z-Y plane including the Z axis aligned with the optical axis of the objective lens () and the Y axis and with the Z-X plane including the Z axis and the X axis.