Back to results
US 5,209,027 AGranted
Polishing of the rear surface of a stamper for optical disk reproduction
AssigneeTDK Corporation
InventorsToshihiko Ishida, Tetuji Takamizawa, Hiroyuki Arioka
Life of this patent
Estimating the term…
Abstract
The rear surface of a stamper for use in the manufacture of optical disks should be polished to precision. A length of abrasive tape is fed across the stamper in pressure contact with the rear surface of the stamper through a pressure roller having a rubber sleeve with a hardness of up to 80 degrees as measured according to ASTM D 2240 type A while the stamper is rotating.
Claims5
A method for polishing a rear surface of a stamper for use in the manufacture of optical disks requiring high speed rotation, comprising the step of:
- feeding a length of abrasive tape across the stamper in pressure contact with the rear surface of the stamper through a pressure roller while the stamper is rotating, said pressure roller comprising a surface layer formed of a rubber having a hardness of up to 80 degrees as measured according to ASTM D 2240 type A for minimizing vibrations of the pressure roller and stamper caused by a motor for driving the stamper so as to uniformly polish the rear surface of the stamper.
Dependencies are inferred from the claim text.