Disc-shaped information carrier having information in the form o

Details Disc-shaped information carrier having information in the form o Disc-shaped information carrier having information in the form o

1977-04-04

1978-11-21

Ansher, Harold

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

156209, 156272, 274 41A, 274 416S, 274 42R, 427 54, 427304, 427314, 428164, 428409, 428913, G11B 700, G11B 582, B32B 1508, B32B 1520

Patent

active

041267265

ABSTRACT:
A disc-shaped information carrier for high-density storage, in particular for video signals, has the information provided on both sides of the carrier and stored in the form of a beam-reflecting surface structure which is covered by a layer of translucent material. A disc-shaped base element is formed by injection molding, pressing, stamping or the like to exhibit a surface structure corresponding to the information to be stored on both sides thereof. Each side has a thin metallic coating applied thereto which maintains the same surface profile and the information structure is protected on each side with a layer of transparent material.

REFERENCES:
patent: 3531317 (1970-09-01), Patheiger et al.
patent: 3655441 (1972-04-01), Kefalas
patent: 3740286 (1973-06-01), Ban
patent: 3745055 (1973-07-01), Gorman
patent: 3800099 (1974-03-01), Dickopp et al.
patent: 3842194 (1974-10-01), Clemens
patent: 3971874 (1976-07-01), Ohta et al.
patent: 3977684 (1976-08-01), Camerik
patent: 4023185 (1977-05-01), Bloom et al.
patent: 4039764 (1977-08-01), Bricot et al.
patent: 4041530 (1977-08-01), Kramer et al.

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