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:
Feb. 17, 2009
Filed:
Aug. 24, 2007
Nobuyuki Mitsunaga, Kawasaki, JP;
Masahide Kanegae, Kawasaki, JP;
Hiroyuki Tanaka, Kawasaki, JP;
Isamu Tomita, Kawasaki, JP;
Masao Kondo, Kawasaki, JP;
Nobuyuki Mitsunaga, Kawasaki, JP;
Masahide Kanegae, Kawasaki, JP;
Hiroyuki Tanaka, Kawasaki, JP;
Isamu Tomita, Kawasaki, JP;
Masao Kondo, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
Upon recording, a clearance control unit performs preheating by an added control value (BR) of a base heater control value B and an adjustment heater control value R and switches that to value B when it reaches a target sector to perform write. Upon reproduction, preheating is performed by the value (BR) and the value (BR) is maintained when it reaches a target sector to perform read. A correction processing unit detects contact between the head and a medium surface while increasing the value R from a predetermined initial value Ro, and sets a new calculated base heater control value B, and value Ro as the adjustment heater control value R. Write assist adjustment in which the measured adjustment heater control value R is adjusted to a heater control value that improves characteristic deterioration immediately after recording is started wherein preheating is switched to write heating is performed.