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:
Oct. 26, 1999
Filed:
Jul. 21, 1997
Applicant:
Inventors:
Nob Kimura, Torrance, CA (US);
Daniel Wu, St. Cerritos, CA (US);
Assignee:
Discovision Associates, Irvine, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369116 ; 369124 ;
Abstract
The present invention includes a method and apparatus for reducing the signal amplitude in long marks which are written into optical disks. When forming a long mark, an increased signal amplitude is typically caused by the blooming toward the end of the mark, and is often sensed by the focused spot in the adjacent track causing increased adjacent track crosstalk (ATC). However, when forming short marks, the effect of blooming is minimized. Therefore, by splitting a long mark into a sequence of short period marks, with short period spaces (1T) between each short period mark, the effect of blooming is substantially reduced.