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:
Sep. 16, 2003
Filed:
Feb. 14, 2000
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
A disk drive includes a DVD optical head and a CD optical head. An objective lens in the CD optical head moves along a reference radial line passing through the center of rotation of an optical disk. An objective lens in the DVD optical head moves along a transfer line parallel to the reference radial line, and is disposed so that an expression R <(Rmin+Rmax)/2 is satisfied, where Rmin and Rmax represent distances along the reference radial line between the center of rotation and the positions of the objective lens when it is disposed on the innermost and outermost tracks of the optical disk, respectively, and R represents a distance along the reference radial line between the center of rotation and the position of the objective lens when its tracking correction direction is towards the center of rotation of the optical disk.