US Patent 7145842 Objective lens moving control method and apparatus

Patent 7145842 was granted and assigned to Sony on December, 2006 by the United States Patent and Trademark Office.

Overview Structured Data Issues Contributors Activity

Is a

Patent

Patent attributes

Current Assignee

Sony

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

71458420

Patent Inventor Names

Toshikazu Kobayashi0

Date of Patent

December 5, 2006

Patent Application Number

100933630

Date Filed

March 7, 2002

Patent Primary Examiner

‌

Andrea Wellington

Patent abstract

In a layer jump, a control signal based on a focus error signal is masked in a period based on a moving speed of an objective lens so as not to be influenced by an unnecessary light component. Thereafter, an observation of the control signal based on the focus error signal is restarted, and a brake signal is sent to the objective lens, and a focus servo is switched to the ON status. Thus, accuracy of the layer jump is improved when the unnecessary light component exists in an interlayer portion of the focus error signal.