Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1989-10-10
1990-09-25
Thibodeau, Paul J.
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
428 65, 428156, 428480, 430271, G11B 2300
Patent
active
049592521
ABSTRACT:
Rigid, dimensionally stable, essentially circular and planar, axially injection-molded disc members, well adapted as support substrates for radiation sensitive layers for optical discs, e.g., laser discs, comprise radially molecularly oriented thermotropic polymers and such disc members have a radiation-sensitive microrelief pattern on at least one of the face surfaces thereof.
REFERENCES:
patent: 4126726 (1978-11-01), Soeding
patent: 4626493 (1986-12-01), Butters et al.
patent: 4668549 (1987-05-01), Lippits et al.
patent: 4680211 (1987-07-01), Evans et al.
patent: 4719171 (1988-01-01), Ikenaga et al.
Bonnebat Claude
Morin Alain
Quentin Jean-Pierre
Rhone-Poulenc Chimie
Thibodeau Paul J.
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