Title:
【発明の名称】光学式情報記録再生装置のトラッキングデフェクト解消方法
Document Type and Number:
Japanese Patent JP2585036
Kind Code:
B2
Abstract:
Tracking servo control of a pickup to an optical card is performed by: obtaining an addition of two tracking error signals detected through respective sub-beam spots, detecting that at least one of the sub-beam spots has met a scratch, etc. from the addition signal, and suspending the tracking servo control while the sub-beam spot is in contact with or located on the scratch, etc. by interrupting a difference error signal and holding a value of the difference error signal just before the interruption.
Inventors:
ADA KAZUHISA
Application Number:
JP33040887A
Publication Date:
February 26, 1997
Filing Date:
December 25, 1987
Export Citation:
Assignee:
KYOCERA CORP
International Classes:
G11B7/0033; G11B7/09; (IPC1-7): G11B7/09
Domestic Patent References:
| JP62271232A | ||||
| JP62239330A | ||||
| JP6280842A | ||||
| JP61148635A | ||||
| JP6196530A | ||||
| JP6196529A | ||||
| JP6196526A | ||||
| JP62202622U | ||||
| JP62117721U |