Mold for molding disc substrata
AssigneeMeiki Co., Ltd.
InventorIkuo Asai
Life of this patent
Estimating the term…
Abstract
A mold for molding digital data discs has interchangeable stampers. An outer peripheral stamper retainer and a mirror block with a convex portion allow interchange without dismounting the mold. The outer stamper peripheral retainer has a plurality of arcuate slots connected or disconnected to a plurality of rods provided with a stationary half-mold and to a corresponding plurality of holder bushings and a mirror block with a convex portion whose diameter fits an inner diameter of the outer stamper peripheral retainer. The outer stamper peripheral retainer and the mirror block correspond in size with a disc to be molded.
Claims3
A mold for molding disc substrata, comprising:
- a stamper mounted on a stationary mirror block, the stationary mirror block being inserted within an inner periphery of a stationary mirror block locating ring mounted on a stationary half-mold;
- an inner stamper retainer having a supporting device, the supporting device being inserted in a central portion of the stationary mirror block, the inner stamper retainer including means for holding an inner peripheral portion of the stamper;
- a unitary outer peripheral stamper retainer, the outer peripheral stamper retainer including a plurality of arcuate slots, each of the slots including a wide width portion and a narrow width portion respectively, the plurality of arcuate slots including first arcuate slots to be connected to the stationary mirror block locating ring of the stationary half-mold and second arcuate slots to be connected to a movable mirror block locating ring of a movable half-mold;
- a plurality of movable holder devices coupled with the stationary half-mold, each of the holder devices including a rod with a head, the head having a rear portion inserted movably in a fluid actuating cylinder in the stationary mirror block locating ring, a front end portion of the rod having a washer, and a coil spring for pulling the rod to connect the outer peripheral stamper retainer to the stationary half-mold;
- a movable mirror block of the movable half-mold having a convex portion, the convex portion being inserted in an inner periphery of the outer peripheral stamper retainer;
- a movable stopper device of the movable mirror block locating ring of the movable half-mold, the movable stopper device including a stopper pin advanced by resilient force of a coil spring and retracted by actuating of fluid cylinder to prevent sudden turning of the outer peripheral stamper retainer held in the movable half-mold;
- a plurality of fixed holder devices of the movable half-mold, each of the fixed holder devices including a holder bushing, the holder bushing including a head portion having a large diameter and a stem portion having a small diameter, each of the fixed holder devices being fixed to the movable mirror block locating ring to connect the outer peripheral stamper retainer to the movable half-mold.
A mold for molding disc substrata comprising:
- a stamper mounted on a stationary mirror block, the stationary mirror block being inserted in an inner periphery of a stationary mirror block locating ring of a stationary half-mold;
- an inner stamper retainer including a supporting device, the supporting device being inserted in a central portion of the stationary mirror block of the stationary half-mold, the inner stamper retainer including means for holding an inner peripheral portion of the stamper;
- a movable half-mold having a movable mirror block with a convex portion, the convex portion having an outer diameter selected in accordance with a disc diameter;
- the stamper having a stamper diameter equal to at least said outer diameter;
- and
- an outer stamper peripheral retainer disposed against said stamper and having an inner diameter selected in accordance with said outer diameter.
Dependencies are inferred from the claim text.