Disc-shaped recording medium

Details Disc-shaped recording medium Disc-shaped recording medium

1991-08-19

1993-09-14

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428913, 346 76L, 3461351, B32B 300

Patent

active

052447057

ABSTRACT:
A disc-shaped recording medium for storing compressed audio data which have been recorded thereon by an optical recording apparatus. The inner diameter of a data recording region of the disc-shaped recording medium is in the range from 28 mm to 50 mm. The outer diameter of the data recording region is in the range from 58 mm to 62 mm for an inner diameter of 28 mm, and is in the range from 71 mm to 73 mm for an inner diameter of 50 mm. The disc-shaped recording medium may be used with a small-sized portable disc recording and reproducing apparatus, and can record compressed audio data for playback with a playback time substantially as long as that of a standard compact disc having 12 cm diameter.

REFERENCES:
patent: 4855979 (1989-08-01), Kimura
patent: 4871404 (1989-10-01), Murata

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