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:
Apr. 13, 1999
Filed:
Jan. 30, 1997
Min Hwangbo, Anyang, KR;
Samsung Electronics Co., Ltd., Kyungki-do, KR;
Abstract
A magnetooptical disk focus servo and tracking servo which remain stable and which make various servo control gains uniform even when the amount of light detected in a photodetecting portion changes. An operator outputs a sum signal by adding signals corresponding to an amount of light detected in at least two photodiodes among a plurality of photodiodes of the photodetecting portion. A first divider divides a focus error signal by the sum signal. A second divider divides a tracking error signal by the sum signal. A focus servo portion controls a focus actuator using the output of the first divider, and a tracking servo portion for controlling a track actuator with the output of the second divider.