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:
Feb. 26, 2013
Filed:
Dec. 23, 2010
Xeufeng Wang, Schenectady, NY (US);
John Erik Hershey, Ballston Lake, NY (US);
Zhiyuan Ren, Malta, NY (US);
Xiaohong LI, Niskayuna, NY (US);
Xeufeng Wang, Schenectady, NY (US);
John Erik Hershey, Ballston Lake, NY (US);
Zhiyuan Ren, Malta, NY (US);
Xiaohong Li, Niskayuna, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
Techniques are provided for using a multi-stage actuator to actuate one or more optical components of an optical head. The multi-stage actuator includes a cross-layer displacement component which actuates an optical component to change the beam focus in a displacement range corresponding to the thickness of the data layers in a holographic disk, such that a beam is impinged on the target data layer. The multi-stage actuator also includes a intra-layer focusing component which actuates the optical component in a smaller range to focus the beam on the target data position. The cross-layer displacement component and the intra-layer focusing component may each include more than one actuator. In some embodiments, the focusing component also actuates the optical component in a tilting motion to compensate for movement or imperfections of the disk during a reading or recording process.