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US 4,791,044 AGranted
Disk type information recording medium
AssigneePioneer Electronic Corporation
InventorToshikazu Yoshino
Life of this patent
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Abstract
A disk-shaped information recording medium is provided in such a manner that at least one information bearing layer formed on a side of a pair of disk-shaped substrates, which substrates are arranged so that the information bearing layers face each other with a hollow space between them by means of inner and outer spacers being concentrically interposed between the two substrates. A polyurethane adhesive layer is formed between the substrate and the spacer to combine said pair of substrates together via the inner and outer spacers.
Claims7
A information recording disk medium comprising:
- a pair of disk-shaped substrates disposed in parallel to each other;
- information bearing layers made of a cyanine dye and formed respectively on surfaces of said pair of substrates which face each other, from which information is read by irradiating a light beam such as a laser beam thereon;
- an inner spacer concentrically interposed between said pair of substrates at a central part of said substrates so as to form a hollow space between said information bearing layers facing each other;
- an outer spacer concentrically interposed between said pair of substrates at a peripheral portion thereof;
- and
- polyurethane adhesive layers having a viscoelastic characteristic and respectively connecting said pair of substrates with said inner and outer spacers.
3 more elements
Dependencies are inferred from the claim text.