For jumping a light spot on a track of a recording medium

Details For jumping a light spot on a track of a recording medium For jumping a light spot on a track of a recording medium

1982-12-02

1985-09-10

Cardillo, Jr., Raymond F.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 33, 369 46, 360 77, G11B 2110

Patent

active

045410836

ABSTRACT:
In a light spot control signal generating device, a light spot is irradiated on a recording medium having tracks on which information is recorded. In order to jump the light spot from a track being scanned thereby to an adjacent track, a signal representative of light quantity of reflection or transmission of the light spot and a track error signal are detected. The two signals are used to judge whether the light spot has passed through an edge of the track. The track error signal is also used to detect a signal representative of an instant at which the light spot is present at the middle point between adjacent tracks, and this signal is used as a timing signal for changing the polarity of a control signal applied to a spot light deflector.

REFERENCES:
patent: 4037252 (1977-07-01), Janssen
patent: 4057832 (1977-11-01), Kappert
patent: 4234837 (1980-11-01), Winslow

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