Track pitch calibration error reduction

Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

369111, G11B 700

Patent

active

045773017

ABSTRACT:
A system and method for optically measuring and maintaining track pitch in an optical storage system. A set of at least four calibration tracks, each having a prescribed track pitch or distance therebetween, are precisely placed on a record carrier of the optical storage system during the manufacture thereof. When this record carrier is subsequently inserted into the optical storage system, the track pitch of a select pair of the calibration tracks is optically measured, and an offset signal is generated in response to this measurement. This offset signal is used within the optical storage system for controllably positioning a second radiation beam with respect to a first radiation beam, the first radiation beam being directed to follow a previously written data track on the record carrier. The offset signal may be stored so that it need only be generated during an initialization or calibration mode of the optical storage system, and thereafter be readily available for positioning the second radiation beam relative to the first radiation beam. The select pair of calibration tracks may be an inner pair, having additional tracks adjacent both sides thereof, or an outer pair, having an additional track adjacent only one side thereof; thereby having included in the offset signal the optical effects of having additional data tracks adjacent or not adjacent the respective sides of the pair of calibration tracks whose track pitch is being measured.

REFERENCES:
patent: 4138741 (1979-02-01), Hedlund et al.
patent: 4167024 (1979-09-01), Hamisch
patent: 4283777 (1981-08-01), Curry et al.
patent: 4290122 (1981-09-01), Bates et al.
patent: 4432083 (1984-02-01), Hsieh et al.
patent: 4504939 (1985-03-01), Eberly

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Track pitch calibration error reduction does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Track pitch calibration error reduction, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Track pitch calibration error reduction will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2310415

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.