Information storage medium and process for producing the same

Details Information storage medium and process for producing the same Information storage medium and process for producing the same

1989-10-05

1991-05-07

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428412, 428913, 369286, 369288, 156 60, 346 76L, 3461351, 264106, B32B 302

Patent

active

050135937

ABSTRACT:
Disclosed is an information storage medium having an air-sandwich structure which comprises two disc-shaped substrates joined together through a ring-shaped inner spacer and a ring-shaped outer spacer. These spacers are made of the same kind of resin as those forming the disc substrates and the resin of the spacers has a viscosity-average molecular weight larger than that of the resin of the substrates. Also disclosed is a process for producing the information storage medium by joining the spacers to the disc substrates by means of ultrasonic welding.

REFERENCES:
patent: 4847827 (1989-07-01), Hayashi et al.

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