The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 13, 1998
Filed:
Dec. 03, 1996
Katsuyuki Yasuda, Funabashi, JP;
Seikoh Giken Co., Ltd., Chiba-Ken, JP;
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.