Metal mold apparatus for molding an optical disk

Details Metal mold apparatus for molding an optical disk Metal mold apparatus for molding an optical disk

1996-12-03

1998-10-13

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

264106, 264107, 425810, B29C 4540

Patent

active

058208984

ABSTRACT:
An optical disk metal mold apparatus includes a fixed cavity plate; a movable cavity plate facing the fixed cavity plate; a disk-shaped plate disposed on at least one of the fixed and movable cavity plates such that it is movable with respect thereto; a stamper plate concentrically supported on the at least one of the fixed and movable cavity plates by the disk-shaped plate such that it is movable with respect to the disk-shaped plate and the at least one of the fixed and movable cavity plates; wherein the stamper plate and the disk-shaped plate are each made of a material and further configured such that a difference between respective deformations of the disk-shaped plate and the stamper plate caused by expansion and contraction thereof due to temperature changes during a molding cycle is smaller than a difference between respective deformations of the stamper plate and the at least one of the fixed and movable cavity plates caused by expansion and contraction thereof due to temperature changes during a molding cycle if the stamper plate were to be in direct contact with the at least one of the fixed and movable cavity plates.

REFERENCES:
patent: 4447381 (1984-05-01), Matey
patent: 5593710 (1997-01-01), Asai

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