Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1990-03-13
1991-10-01
Levy, Stuart S.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4425, 369 30, 369 33, G11B 700, G11B 708
Patent
active
050540130
ABSTRACT:
A track transverse detection signal generating circuit in a LD or a CD player, which comprises a presence signal amplifier for amplifying a presence signal indicating that an optical spot for reading information exists on a recording track, a controller for receiving a speed signal corresponding to a moving speed of the optical spot for reading information on the recording track to control an amplification level of the presence signal amplifier in response to the moving speed of the optical spot, and a presence signal comparator for receiving the presence signal which has been amplified and transmitted from the presence signal amplifier, for making a comparison between the amplified presence signal and a reference value, and for transmitting a pulse-shaped track transverse detection signal. Therefore, a track transverse detection signal can be reliably generated by raising the gain of the presence signal amplifier or lowering the reference value of the present signal comparator in the case of a track jump operation in which the optical pickup moves at a speed higher than that in the case of an operation of reproducing the optical disk normally and in the case of a high speed accessing operation in which the same moves at a further raised speed.
REFERENCES:
patent: 4330880 (1982-05-01), Van Dijk
patent: 4611316 (1986-09-01), Takeuchi
patent: 4627038 (1986-12-01), Abed
patent: 4698795 (1987-10-01), Yoshio
patent: 4817073 (1989-03-01), Suzuki
patent: 4819219 (1989-04-01), Nagano
patent: 4835754 (1989-05-01), Yamamoto
patent: 4860271 (1989-08-01), Yokogawa
patent: 4887253 (1989-12-01), Tateishi
Levy Stuart S.
Pioneer Electronic Corporation
Pokotylo John
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