Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1989-09-26
1991-01-29
Psitos, Aristotelis M.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 32, 369111, 369116, G11B 709
Patent
active
049891944
ABSTRACT:
An optical information processing method comprises a step of recording and/or reproducing information by irradiating a light beam to a periodically relatively moving record medium, detecting focusing and/or tracking servo signals and driving auto-focusing and/or auto-tracking means in accordance with the detected servo signals, a step of storing detected servo signals of at least one period of the movement of the medium, and a step of stopping the irradiation of the light beam to the medium and driving the auto-focusing and/or auto-tracking means in accordance with the stored ervo signals. An optical information processing apparatus for embodying the above method comprises a device for irradiating a light beam to an optical information record medium, a device for periodically moving the record medium relative to the light beam, a device for detecting focusing and/or tracking servo signals from the light beam reflected by or transmitted through the medium, auto-focusing and/or auto-tracking device, a feedback circuit for feeding the detected servo signal back to the auto-focusing and/or auto-tracking device, a device for storing the detected servo signals of at least one period of movement of the medium, and control device for deactivating the feedback circuit and activating the auto-focusing and/or auto-tracking device in accordance with the signals stored in the storage device when the irradiation of the light beam to the medium is stopped.
REFERENCES:
patent: 4205338 (1980-05-01), Schaefer
patent: 4527263 (1985-07-01), Nakagawa
patent: 4623994 (1986-11-01), Nabeshima et al.
patent: 4669075 (1987-05-01), Abe
patent: 4688202 (1987-08-01), Mukai et al.
Canon Kabushiki Kaisha
Psitos Aristotelis M.
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