Recording video information on a flexible master disc

Details Recording video information on a flexible master disc Recording video information on a flexible master disc

1978-03-13

1980-09-09

Hecker, Stuart N.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

156 74, 274 39R, 346137, H04N 576, B32B 3116

Patent

active

042220700

ABSTRACT:
Video information is commonly recorded on a master record device such as a video disc by focussing a modulated recording beam on the master disc and rotating the disc relative to the focussed recording beam. During exposure, the recording beam travels across the rotating master disc so that a spiral track of video information is recorded. Because of the extremely small depth of focus, typically less than a micron, focus maintenance is simplified if the master disc recording surface is optically flat. This requirement has led to the use of a relatively expensive master video disc comprised of optically polished glass, quartz or other rigid material. In accordance with the present invention, a method of recording video information on a master disc is provided which permits the use of an inexpensive flexible master disc comprised of ESTAR or other similar material, and yet which enables an extremely small depth of focus to be accurately maintained.

REFERENCES:
patent: 3687667 (1972-08-01), Hayakawa et al.
patent: 3729720 (1973-04-01), Darling et al.
patent: 3737880 (1973-06-01), Kelley
patent: 3805292 (1974-04-01), Hashiguchi et al.
patent: 3825323 (1974-07-01), Landwer
patent: 3922086 (1975-11-01), Freericks
patent: 3992576 (1976-11-01), Sugiura
patent: 4003059 (1977-01-01), Sugiura et al.

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