Information recording medium

Details Information recording medium Information recording medium

1989-02-15

1990-09-11

Ryan, Patrick

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428913, 346 11, 346 76L, 3461351, 346137, 369284, B32B 302

Patent

active

049562134

ABSTRACT:
An improvement of an information recording medium comprising a disc-shaped resin substrate having an inner-side non-recording zone and an outer-side non-recording zone, a laser-sensitive recording layer, and a flexible resin film (for protection of the recording layer, having protruded and depressed portions on at least the surface facing the recording layer is disclosed. The improvement comprises joining the substrate and the flexible resin to each other on the inner-side and outer-side non-recording zones through fusion by ultrasonic welding or thermal welding in such manner that at least one joining of the flexible resin film to the substrate on the outer-side non-recording zone and the inner-side non-recording zone is effected through a fused portion in the form of a discontinuous ring.

REFERENCES:
patent: 4353767 (1982-10-01), Wilkinson
patent: 4539673 (1985-09-01), Winslow
patent: 4564932 (1986-01-01), Lange
patent: 4590493 (1986-05-01), Inoue et al.
patent: 4644520 (1987-02-01), Lange

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