Optical disc

Details Optical disc Optical disc

1987-11-18

1990-03-27

Thomas, Alexander S.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

369282, 369286, 3461351, 346137, 430945, G01D 4514, G01D 1534

Patent

active

049119680

ABSTRACT:
An optical recording disc which includes a pair of recording disc substrates opposed to each other with a space therebetween, with a hub situated at the central portion of the disc substrates so that there is formed the closed space between the disc substrates, thereby providing a dual sided recordable optical recording disc. The hub may be formed by a pair of hub halves. There is disposed an annular inner spacer and annular outer spacer around the hub so as to separate the pair of recording disc substrates.

REFERENCES:
patent: 4555716 (1985-11-01), Odawara et al.
patent: 4686543 (1987-08-01), Tani et al.
patent: 4710913 (1987-12-01), Matsushima et al.
Philips Technical Review, vol. 40, 10/1982, No. 10, "Manufacture of Laser Video Discs by a Photopolymerization Process."

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