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

1990-06-27

1991-12-17

Hoag, Willard

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

Surface deformation means only

425810, B29C 4302

Patent

active

050731017

ABSTRACT:
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: 4481620 (1984-11-01), Murakami
patent: 4482511 (1984-11-01), Komatsubara
patent: 4723903 (1988-02-01), Okazaki

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