Die for molding disc substrates
AssigneeKabushiki Kaisha Meiki Seisakusho
InventorToshiyuki Ebina
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Abstract
The present invention aims at increasing service life of an inner circumferential stamper holder in a die for molding disc substrates that is used when the disc substrates are injection molded. To that end, in the die for molding the disc substrates in which a stamper 3 is supported by at least one of a stationary die 6 and a movable die 1, an abrasion resistant treatment is applied to at least a portion, which abuts against a side surface 3a of a center opening of the stamper 3, of an outer circumferential surface 4a of the inner circumferential stamper holder 4 supporting the stamper 3.
Claims3
A die for molding disc substrates in which a stamper is supported by at least one of a stationary die and a movable die,
- wherein an abrasion resistant treatment is applied to at least a portion, which abuts against a side surface of a center opening of the stamper, of an outer circumferential surface of an inner circumferential stamper holder supporting the stamper;
- wherein said inner circumferential stamper holder is made of stainless steel, and
- said abrasion resistant treatment is a coating of any of DLC, a nitride, a carbide, hard chromium and tungsten carbide applied to said stainless steel.
Dependencies are inferred from the claim text.