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Automatic Tracking Balance and Threshold Control

IP.com Disclosure Number: IPCOM000037157D
Original Publication Date: 1989-Nov-01
Included in the Prior Art Database: 2005-Jan-29

Publishing Venue

IBM

Related People

Authors:
Conly, DJ Teets, RW [+details]

Abstract

An important parameter for reliable tracking in an optical disk drive is that the tracking servo operates nominally as close to the center of the linear region of the tracking error signal as possible. Small movements of laser and other optical components in the head cause shifts in the balance between the light on the two halves of the tracking detectors. Movement of the rest position of the actuator lens in the tracking direction also causes an imbalance in light on the two halves of tracking. Excessive tracking transients need to be detected during recording to prevent destroying data on adjacent tracks in the event of an inadvertent track jump. (Image Omitted)