Making a data-carrying optical disk

Details Making a data-carrying optical disk Making a data-carrying optical disk

1992-05-15

1993-03-09

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Forming sound grooves in records

2643281, 264336, 264342R, B29C 4542

Patent

active

051924749

ABSTRACT:
An optical disk having a pair of axially oppositely directed faces and an annular outer periphery is made by first forming a mold cavity corresponding to the shape of the disk between a pair of axially spaced parts and a demolding ring sandwiched between the parts. The cavity is then filled with a hardenable resin such that the parts form the respective faces and an inner periphery of the ring forms the outer periphery of the disk and the resin is at least partially hardened in the cavity. The parts are then axially oppositely separated from each other and from the disk to leave the disk in the ring with both of its faces exposed and the ring is then transversely displaced with the disk engaged in it out from between the mold parts. The disk is then cooled and shrunk such that its outer periphery separates from the inner periphery of the ring and the disk separates from the ring.

REFERENCES:
patent: 2390129 (1945-12-01), Shobert
patent: 4118168 (1978-10-01), Rees et al.
patent: 4519767 (1985-05-01), Westerman, Jr.
patent: 4618466 (1986-10-01), McGlashen et al.

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