Information recording medium of air-sandwich structure

Details Information recording medium of air-sandwich structure Information recording medium of air-sandwich structure

1985-10-15

1986-10-07

Goldberg, E. A.

Recorders

Record receivers and/or driving means therefor

Disc

369284, 369287, G01D 1532, G11B 726

Patent

active

046162380

ABSTRACT:
In an information recording medium having an air-sandwich structure comprising two disc-shaped substrates opposed to each other at a given space by interposing therebetween a ring-shaped inner spacer and a ring-shaped outer spacer and a recording layer for writing and/or reading information with laser beam which is provided on the inner surface of at least one substrate, the improvement in which at least one spacer is an adhesive-retainable spacer comprising a ring portion of protecting circumferences of the substrates and a protruding ring portion of arranging the two substrates apart, the latter ring portion protruding from a side of the protective ring portion and comprising a front portion for defining the space between the substrates and a stem portion being thinner than the front portion for retaining an adhesive, whereby an excessive adhesive or a volatile material of the adhesive is discharged through a space between the substrate and the stem portion of the protruding ring portion.

REFERENCES:
patent: 4462036 (1984-07-01), Leonard et al.
patent: 4564850 (1986-01-01), Kazuharu

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