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:
Nov. 21, 1989
Filed:
Feb. 24, 1988
Applicant:
Inventors:
Roger R Bracht, Colorado Springs, CO (US);
Johannes J Verboom, Bergeyk, NL;
Assignee:
Laser Magnetic Storage International Company, Colorado Springs, CO (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 54 ;
Abstract
Provided is a read signal offset during write verify which prevents the false detection of amorphous pips from an optical disk recorder. Amorphous pips are the signals caused by the drop in reflection from an optical disk after the laser has caused the surface material to change from its crystalline state to an amorphous state, but not to a hole. When a hole is not formed in the material, the amorphous material later recrystallizes, the drop in reflection no longer occurs and information is lost.