Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1984-08-15
1987-05-26
Faber, Alan
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
369 46, 250201, G11B 709
Patent
active
046690743
ABSTRACT:
An optical storage system employing a laser beam which is directed and focused onto an optical disk for reading and/or writing data in a track of the disk. Proper focusing is maintained using focusing control circuitry which produces a focus error signal that is applied to a focus motor. This focusing control circuitry is able to return the objective lens assembly to its in-focus position so long as the objective lens assembly remains within a predetermined capture range. In the event that the objective lens assembly is outside of this capture range, a waveform generator is enabled which produces a correction signal that causes the focus motor to move the objective lens assembly back within the capture range with a velocity and for a time period sufficient to permit the focusing control circuitry to regain control and return the objective lens assembly to its in-focus position.
REFERENCES:
patent: 3932700 (1976-01-01), Snopko
patent: 4128847 (1978-12-01), Roullet
patent: 4216501 (1980-08-01), Bell
patent: 4222071 (1980-09-01), Bell
patent: 4232337 (1980-11-01), Winslow
patent: 4243848 (1981-01-01), Utsumi
patent: 4243850 (1981-01-01), Edwards
patent: 4253019 (1981-02-01), Ophey
patent: 4253734 (1981-03-01), Komurasaki
patent: 4268745 (1981-05-01), Okano
patent: 4368526 (1983-01-01), Harigae
patent: 4417330 (1983-11-01), Hazel
"An Optical Disk Replaces 25 Mag Tapes" by Kenney, pp. 33-38, IEEE Spectrum; Feb., 1979.
"Optical Disk Systems Emerge" by Bartolini, pp. 20-28, IEEE Spectrum; Aug., 1978.
"Antireflection Structures for Optical Recording" by Bell, IEEE Journal of Quantum Electronics, vol. QE-14, No. 7, Jul., 1978.
"Ten Billion Bits on a Disk" by Bulthuis, pp. 26-33, IEEE Spectrum; Aug., 1979.
Hsieh Der C.
LaBudde Edward V.
Burroughs Corporation
Cass Nathan
Chung Edmund M.
Faber Alan
Peterson Kevin R.
LandOfFree
Focusing control circuitry for an optical memory system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Focusing control circuitry for an optical memory system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Focusing control circuitry for an optical memory system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-708265