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:
Dec. 09, 1997
Filed:
Jan. 16, 1996
Roger A Hajjar, Faiport, NY (US);
Jeffrey T Klaus, Rochester, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
An apparatus for use in an optical system in which information is read from a recorded wobbled groove of an optical medium by detecting first and second portions of a return beam in first and second detectors producing detected signals, respectively, the apparatus comprising: gain control circuit means coupled to the first and second detectors, respectively, and receiving the first and second detected signals therefrom; the gain control circuit means being responsive to the detected signals for producing a summation signal which is a function of the sum of the two detected signals; a first signal difference circuit coupled to the first and second detected signals for providing a difference signal; and a second signal difference circuit responsive to the difference signal and the summation signal for producing a wobbled groove information signal.