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. 21, 2004
Filed:
Oct. 24, 2002
Fumihiro Itoh, Yawata, JP;
Jun Kikuchi, Takatsuki, JP;
Abstract
The present invention provides an optical disk device that reduces a track lead-in time associated with a seek time. A switching means includes a multiplier A for multiplying an output of a speed control means by &agr; and a multiplier B for multiplying an output of a position control means by (1−&agr;), and an adder for adding an output of the multiplier A and an output of the multiplier B to output a result of the addition as control input to an actuator driving means . At the time of movement of an optical pickup toward a target track, the multiplier factor &agr; for the multipliers A and B is set at 0, thereby performing control of the actuator driving means by means of the position control means . After the optical pickup reaches the vicinity of the target track, the multiplier factor &agr; is set to be gradually increased from 0 to 1 at a predetermined ratio, whereby the speed control means is gradually made operate to make the lens follow the eccentricity of the optical disk