Optical information recording and/or reproducing apparatus and m

Details Optical information recording and/or reproducing apparatus and m Optical information recording and/or reproducing apparatus and m

1993-01-22

1993-09-21

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4435, G11B 700

Patent

active

052475026

ABSTRACT:
In apparatus for recording information and/or reproducing information by irradiating a light beam to a disk shaped optical recording medium, there are provided an adjusting mechanism for adjusting an irradiation state of the light beam to the recording medium, a detector for detecting an irradiation sate error signal of the light beam transmitted or reflected from the recording medium to the recording medium. Further, there are provided a feedback circuit, a storing device and providing circuit. In the feedback circuit, the irradiation state error signal obtained by the detector is sampled at a predetermined rate to generate a control signal for the adjusting mechanism by use of the sampled irradiation state error signal, and the control signal is fed back to the adjusting mechanism. The sampling of the irradiation state error signal is effected at a different rate from that in the detector and the sampled irradiation state error signal is stored in the storing device. The irradiation state error signal stored in the device is input to the feedback circuit by the providing circuit.

REFERENCES:
patent: 4286318 (1981-08-01), Immink et al.
patent: 4707816 (1987-11-01), Yonezawa et al.
patent: 4785442 (1988-11-01), Ohtake et al.
patent: 4866688 (1989-09-01), Ohtake et al.
patent: 4872152 (1989-10-01), Tsuyoshi et al.
patent: 4949331 (1990-08-01), Maeda et al.

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