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:
Mar. 02, 2004
Filed:
Sep. 28, 2001
Kenichi Oono, Saitama, JP;
Keiichi Takagi, Saitama, JP;
Pioneer Corporation, Tokyo, JP;
Abstract
When the position of the pickup is normalized, a lead screw is rotated by a stepping motor to move the pickup to the outermost circumferential position, whereby a preset counter is preset to the maximum value CTout corresponding to the outermost circumferential position. The counter counts proportionally to the number of driving pulses to be supplied to the stepping motor, the lead screw rotates till the counting value of the counter gets “0”, so that the pickup moves near the outermost circumferential track of the optical disk in the lead-in area to make the set up. The shape of the tooth flank of the lead screw and the inclination of the engaging projections are designed such that the step out is caused between the engaging projections and the lead screw when the pickup is moved to the outermost circumferential position. Even if this step out is caused, the engaging projections only engage strongly with the lead screw