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:
Aug. 12, 1997
Filed:
Sep. 20, 1995
Kan Ebisawa, Kanagawa, JP;
Kazumichi Hatate, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A disc recording device for recording a first information signal and a second information signal, e.g. a pilot signal, on a disc-shaped recording medium comprises an optical pick-up having first and second laser diodes for recording the first and second information signals on the disc-shaped recording medium, a first modulator for modulating the first information signal at a first frequency, a first laser diode modulator for driving the first laser diode based on a signal outputted from the first modulator, a generator for generating the second information signal of a second frequency and a second laser diode modulator for driving the second laser diode based on the second information signal.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile