Mold for cast molding substrate having preformat with informatio

Details Mold for cast molding substrate having preformat with informatio Mold for cast molding substrate having preformat with informatio

1989-03-10

1991-06-25

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264 19, 264106, 264129, 249117, 249140, 425810, 425543, 425411, 425414, 425416, 425422, B29C 3902, B29C 3912

Patent

active

050265105

ABSTRACT:
A cast mold and process for casting a substrate for an information recording medium has an uneven preformat pattern formed on the mold surface. The uneven preformat features a pattern corresponding to tracking grooves and information pits, each information pit portion has a size with a length b in the direction parallel to the pattern of the tracking groove of 2 to 15 .mu.m and a width a in the direction perpendicular thereto of 1 to 6 .mu.m and a height c of 300 to 3500 .ANG.. The pit pattern has a pitch which is 1.8-fold or more of pit length b.

REFERENCES:
patent: 3875024 (1975-04-01), Picquendar
patent: 3882214 (1975-05-01), Nosker
patent: 4387068 (1983-01-01), Llabres
patent: 4430401 (1984-02-01), Wilkinson
patent: 4743409 (1988-05-01), Nomura
patent: 4900902 (1990-02-01), Sakakibara

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