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US 5,626,890 AGranted
Mold for molding discs
AssigneeMeiki Co., Ltd.
InventorIkuo Asai
Life of this patent
Estimating the term…
Abstract
In a mold for molding data discs having a stationary cylindrical member and a movable cylindrical member fixed to a stationary moldhalf and movable moldhalf respectively, in each of which a stationary mirror plate and a movable mirror plate are fixed, an outer peripheral ring is set on the outer peripheral surface of the movable mirror plate, having a protrusion in the lower portion of a small inner peripheral surface of the outer peripheral ring for preventing leakage of air blowing into a cavity to release the discs from the stamper.
Claims6
A mold for molding discs, comprising:
- a stationary mold half on which are mounted a stationary cylindrical member and a stationary mirror plate fixed inside thereof, the stationary mold half defining a stationary side wall of a mold cavity when the mold is closed;
- a movable mold half on which are mounted a movable cylindrical member and a movable mirror plate fixed inside thereof, the stationary mirror plate concentric with the movable mold half, the movable mold half defining a movable side wall of a mold cavity when the mold is closed;
- a stamper set in concentrically on the movable mirror plate;
- an outer peripheral ring fixed so that a large inner peripheral surface thereof is in close contact and concentric with the outer peripheral surface of the mirror plate, of which a small inner peripheral surface defines an outer peripheral surface of the mold cavity, having a protrusion at the lower portion of the small inner peripheral surface so as to prevent leakage of blown air along the inner periphery of the outer peripheral ring;
- and
- a first air passage in an interior of the outer peripheral ring, the first air passage connected to a second air passage provided in an interior of the movable cylindrical member, the first air passage and the second air passage to blow air into the mold cavity.
3 more elements
A mold for molding discs, comprising:
- a movable mold half on which are mounted a movable cylindrical member and a movable mirror plate fixed inside thereof, the movable mold half defining a movable side wall of a mold cavity when the mold is closed;
- a stationary mold half on which are mounted a stationary cylindrical member and a stationary mirror plate fixed inside thereof, the movable mirror plate concentric with the stationary mold half, the stationary mold half defining a stationary side wall of a mold cavity when the mold is closed;
- a stamper set in concentrically on the stationary mirror plate;
- an outer peripheral ring fixed so that a large inner peripheral surface thereof is in close contact and concentric with the outer peripheral surface of the mirror plate, of which a small inner peripheral surface defines an outer peripheral surface of the mold cavity, having a protrusion at the lower portion of the small inner peripheral surface so as to prevent leakage of blown air along the inner periphery of the outer peripheral ring;
- and
- a first air passage in an interior of the outer peripheral ring, the first air passage connected to a second air passage provided in an interior of the stationary cylindrical member, the first air passage and the second air passage to blow air into the mold cavity.
3 more elements
Dependencies are inferred from the claim text.