Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Surface deformation means only
Patent
1994-05-17
1998-05-26
Mackey, James P.
Plastic article or earthenware shaping or treating: apparatus
Preform reshaping or resizing means: or vulcanizing means...
Surface deformation means only
2491141, 249116, 425403, 425810, 428469, 428472, 428622, 428629, B29C 3338, B32B 300
Patent
active
057561303
ABSTRACT:
There is provided a stamper for producing a recording medium exhibiting excellent durability and capable of stably forming projections and pits and a method of producing the stamper. A stamper for producing a recording medium comprising projections and pits in a predetermined pattern on the surface thereof, wherein a value of tan .theta..sup.-1 obtainable from an enlargement angle .theta. of an output from a cartridge with respect to an enlargement of an output denoting a load measured by a test of scratching the surface having the projections and pits under conditions that a diameter of a stylus is 100 .mu.m and a loading speed of 1 .mu.m/second is 1.3 or more.
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Ishihama Hiroshi
Kojima Yoshitaka
Nakashima Shoichi
Obara Hiroshi
Umebayashi Nobuhiro
Hitachi , Ltd.
Hitaci Maxell, Ltd.
Mackey James P.
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