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.
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 on substrate, the improvement in which at least one spacer is an adhesive-retainable spacer comprisign 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.
Claim 2
Dependent Claim
157 words
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 on substrate, the improvement in which at least one spacer is an adhesive-retainable spacer comprisign 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.
Claim 3
Dependent Claim
29 words
The information recording medium as claimed in claim 1, wherein said stem portion of the adhesive-retainable spacer has an adhesive-retaining concave on either of the upper-side and under-side thereof.
Claim 4
Dependent Claim
25 words
The information recording medium as claimed in claim 1 or 2, wherein each of said inner spacer and said outer spacer is the adhesive-retainable spacer.
Claim 5
Dependent Claim
35 words
The information recording medium as claimed in claim 1 or 2, wherein said protruding portion of the adhesive-retainable spacer is so tappered that the thickness continuously increases from the stem thereof to the front thereof.
Claim 6
Dependent Claim
31 words
The information recording medium as claimed in claim 1 or 2, wherein said protruding portion of the adhesive-retainable spacer has an adhesive-retaining concave, the concave having an equal depth throughout thereof.