US Patent 7233556 Disk discrimination method

Patent 7233556 was granted and assigned to Lite-On on June, 2007 by the United States Patent and Trademark Office.

Overview Structured Data Issues Contributors Activity

Is a

Patent

Patent attributes

Current Assignee

Lite-On

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

72335560

Patent Inventor Names

Yu-Hung Sun0

Date of Patent

June 19, 2007

Patent Application Number

107112120

Date Filed

September 1, 2004

Patent Primary Examiner

‌

Thang V. Tran

Patent abstract

A method for discriminating an optical disk is disclosed. Peak values and trough values of focus error signal and RF level signal are detected by an operation of focus search. Threshold levels for detecting each material layer of the optical disk are determined according to the peak values and the trough values. Thereafter another focus search for the optical disk is executed to calculate a thickness of the substrate and a distance between the first and the second recording layer of the optical disk according to the threshold levels. Thus the type of the optical disk can be discriminated.