Trapezoidal smooth grooves for video disc

Details Trapezoidal smooth grooves for video disc Trapezoidal smooth grooves for video disc

1974-09-06

1976-07-06

Eddleman, Alfred H.

Telegraphy

Systems

Alternating or pulsating current

1791004R, 274 42R, H04N 576, G11B 1112

Patent

active

039683265

ABSTRACT:
A method of forming a disc having an information recording groove of regular cross-sectional shape by forming a preliminary spiral groove of trapezoidal cross-section in a disc having a relatively flat surface, and then flowing an excess of viscous material on the groove surface of the disc while rotating the disc rapidly and long enough to flow off the excess viscous material so as to leave a continuous coating of viscous material over the surface of the disc, the trapezoidal regions being covered by a coating having a relatively constant radius of curvature.

REFERENCES:
patent: 3235672 (1966-02-01), Beguin
patent: 3654401 (1972-04-01), Dickopp
patent: 3842217 (1974-10-01), Clemens

Affiliated with

Also associated with

Rating

Trapezoidal smooth grooves for video disc does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Trapezoidal smooth grooves for video disc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Trapezoidal smooth grooves for video disc will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1534574