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:
Aug. 22, 1995
Filed:
Jun. 27, 1994
Fujitsu Limited, Kawasaki, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
A seek control system is used for a magneto-optic disk unit which has an optical head driven by a VCM positioner, two lens actuators disposed on the optical head, and respective object lenses disposed on the lens actuators for passing first and second beams (erase and write beams) to irradiate an identical track on a medium thereby to record and reproduce data thereto and therefrom. To shorten an access time needed for accessing a target track through a lens seek operation carried out by driving the two lens actuators and to prevent a deviation (off-track) of the second beam from the target track during the VCM positioner seek operation according to the first beam and shorten an access time, upon receiving a seek instruction from a higher device respective, exclusive use processors carry out the lens seek control of the first and second beams, in parallel. The number of tracks respectively crossed the first and second beams are counted so that, when the moving speed of the second beam decreases to a lens seek possible speed at a specified target track due to the positioner seek operation with the first beam, the lens seek operation with the second beam is started.