Optical information record disk

Details Optical information record disk Optical information record disk

1987-10-23

1989-03-14

Goldberg, E. A.

Recorders

Record receivers and/or driving means therefor

Disc

369284, G01D 1534, G11B 370

Patent

active

048128570

ABSTRACT:
The structure of an annular spacer adapted to be sandwiched between a pair of circular base plates in an optical information record disk of the air sandwiching type.
The annular spacer has an annular groove having a flattened bottom which groove is formed on each of opposite faces of the annular spacer on which circular base plates are carried in order to allow layers of a bonding agent between the circular base plates and the spacer to have a sufficient thickness required for adhesion between them.

REFERENCES:
patent: 4365258 (1982-12-01), Geyer

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