Disc metal mold and recorded disc

Details Disc metal mold and recorded disc Disc metal mold and recorded disc

1996-12-18

1998-12-22

Evans, Elizabeth

Stock material or miscellaneous articles

Circular sheet or circular blank

428 642, 428 644, 428 652, 428913, 4304951, 430945, 369283, 425190, 425192R, 264107, 264335, B32B 300

Patent

active

058516204

ABSTRACT:
Improved disc metal mold provides an improved disc without a ring groove thereon. The improved disc metal mold has a fixed metal mold section and a movable metal mold section for forming a cavity therebetween. One of the fixed and movable metal molds has a stamper having an information signal surface on which an information signal is formed in a form of pits, wherein a fused resin is injected into the cavity to form a disc substrate having a center through hole at the center thereof. The disc metal mold includes the stamper having an center hole at a center thereof for retaining the stamper itself and a retainer for retaining the stamper to engage with the center hole of the stamper. The retainer has a slightly larger diameter at a top surface thereof than a diameter of the center hole of the stamper so that the top surface of the retainer is approximately flush with the information signal surface of the stamper by causing the top end thereof to engage with the center hole of the stamper. Thus, it is possible to provide a recorded disc having a seamless flush information surface without ring groove.

REFERENCES:
patent: 4795127 (1989-01-01), Asai
patent: 4979891 (1990-12-01), Kitamura
patent: 5059462 (1991-10-01), Kurisu et al.
patent: 5345436 (1994-09-01), Higuchi
patent: 5607705 (1997-03-01), Asai

Affiliated with

Also associated with

Rating

Disc metal mold and recorded disc does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Disc metal mold and recorded disc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Disc metal mold and recorded disc will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2043954