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:
Jul. 10, 2001
Filed:
Dec. 15, 1998
Seiji Kobayashi, Kanagawa, JP;
Roderick Koehle, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
An optical information recording apparatus, an optical information recording method and an optical information recording medium according to the present invention enable second information such as character information, graphic information and the like to be recorded on a disk as a large laser output difference, thereby making it possible to record the second information clearly. The optical information recording apparatus comprises a modulation signal generating device (modulating circuit,) for generating a modulation signal SB which changes in response to first information SA, a time change signal generating device (staircase generating circuit,) for generating a time change signal SF which changes in accordance with second information SE, a light amount changing device (optical modulator,A) for changing a light amount of laser beam in accordance with the time change signal SF and an optical modulation device (optical modulator,B) for turning on and off a laser beam L,obtained from the light amount changing device,A in accordance with the modulation signal SB and wherein the light amount of laser beam is changed slowly by the second information SE.