Cover assembly for optical recording medium

Details Cover assembly for optical recording medium Cover assembly for optical recording medium

1983-03-14

1985-02-12

Goldberg, E. A.

Recorders

Record receivers and/or driving means therefor

Disc

3461351, 346 76L, 369284, 156245, G01D 1534, G01D 1514, B29C 1900

Patent

active

044994770

ABSTRACT:
A cover assembly for use with a disk-shaped optical recording medium, having two substantially identical halves, each having an inner surface adapted to provide upon assembly with the medium an air gap adjacent an optical recordable coating on the medium. Each cover half is transparent and has substantially no birefringent characteristics on the region overlying the air gap, thus allowing light to pass unimpeded therethrough. The cover assembly is adapted to be coupled to the central hub of the optical recording medium and to have a raised annulus adjacent thereto to support the assembly and minimize contact with the transparent portion.

REFERENCES:
patent: 4037251 (1977-07-01), Bricot et al.
patent: 4074282 (1978-02-01), Balas, Jr. et al.
patent: 4308545 (1981-12-01), Lehureau et al.
patent: 4313190 (1982-01-01), Slaten
patent: 4331966 (1982-05-01), Moe
patent: 4365257 (1982-12-01), Gerfast

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