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:
Aug. 07, 1997
Yoshihiro Sakanushi, Kanagawa, JP;
Mitsumi Electric Co. Ltd., Tokyo, JP;
Abstract
In an optical pickup, the sum signal -V.sub.MAIN of the light receiving sections A, B, C and D of a main photo diode is applied to an inversion amplifier Amp9, and the sum signal V.sub.MAIN is applied to a data processor section and a mirror signal arithmetic section. An inversion amplifier Amp10, on the side of sub photo diodes, receives the sum of the sum signal -V.sub.SUB E and a corrected signal C*V.sub.MAIN which is obtained by adjusting the sum signal V.sub.MAIN of the main photo diode with a variable resistor VR1. The output of the inversion amplifier Amp10 becomes a regular sub beam receiving signal V.sub.SUB which is obtained by subtracting a correcting signal whose voltage is equal to the main beam leakage signal from the sub photo diode sum signal V.sub.SUB E. The regular sub beam receiving signal is applied to the mirror signal arithmetic section.