Information recording medium, production process and molding die

Details Information recording medium, production process and molding die Information recording medium, production process and molding die

1989-01-25

1990-09-11

Ryan, Patrick

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428913, 264104, 369272, 3692751, 369277, 369280, 346 76L, 3461351, B32B 302

Patent

active

049562142

ABSTRACT:
There is provided a molding die for an information recording medium substrate having a prescribed unevenness pattern comprising a track portion and an information pit portion which has a planar shape of a polygon wherein at least one diagonal is substantially parallel to the track portion. Such molding die provides an information recording medium substrate without lack in the periphery of a pre-format.

REFERENCES:
patent: 3501586 (1970-03-01), Russell
patent: 4509162 (1985-04-01), Rester
patent: 4710418 (1987-12-01), Takano et al.

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