Method and apparatus for measuring speed of movement during beam

Details Method and apparatus for measuring speed of movement during beam Method and apparatus for measuring speed of movement during beam

1990-04-10

1993-07-13

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 32, G11B 700

Patent

active

052280195

ABSTRACT:
A method for measuring the speed of movement during beam track movement in an optical memory apparatus which moves a beam spot on a rotating optical recording medium, a beam spot is received from the optical recording medium and it is detected when the beam spot crosses a track. The number of the detected track crossings of the beam spot during a predetermined time are detected, and the interval of the detected track crossings is measured. The remainder time from the time when a track crossing is detected to the end of the predetermined time is counted, and the amount of movement of the beam spot in the predetermined time from the number of tracks counted, the time of the track crossing interval detected, and the remainder time detected, is measured.

REFERENCES:
patent: 4593386 (1986-06-01), Kuwabara et al.
patent: 4866687 (1989-09-01), Kasai et al.
patent: 4899325 (1990-02-01), Katsuhara et al.
patent: 4972350 (1990-11-01), Sander et al.
patent: 5050146 (1991-09-01), Richsels et al.

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