Apparatus for detecting servo-lock state in rotation of rotary r

Details Apparatus for detecting servo-lock state in rotation of rotary r Apparatus for detecting servo-lock state in rotation of rotary r

1985-05-28

1988-01-05

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358338, 358906, 358342, 360 73, H04N 5781

Patent

active

047179694

ABSTRACT:
A servo lock or sync detecting apparatus is provided for an electronic still camera system. When the images captured and recorded with such a still camera system are reproduced in a separate television system, for example, stable disk rotation is essential for achieving a stable image reproduction. To this end, a servo lock detecting apparatus is provided in which timing signals are generated as a function of the rotational speed of the magnetic disk, and a driving device for driving the disk is controlled by a control unit. The control circuit counts the periods of the timing signals using reference clock signals to produce servo lock signals when the timing signal periods are within a preset range for a preset number of times. The servo lock signals indicate that the servo lock or sync is established in the driving device.

REFERENCES:
patent: 4439849 (1984-03-01), Nabeshima
patent: 4485337 (1984-11-01), Sandusky
patent: 4603412 (1986-07-01), Yamazaki

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