Device for producing an information recording disk

Details Device for producing an information recording disk Device for producing an information recording disk

1981-09-04

1984-09-18

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

With direct application of magnetic force to manipulate...

204 6, 264107, 425110, 4251744, 425290, 425810, B29D 1700

Patent

active

044721242

ABSTRACT:
A device for producing information recording disks comprises a stamper mount for placing a stamper thereon, a stamper-fixing shaft for fixing the stamper, and a pressing plate for pressing a backing plate toward the stamper after a liquid resin is injected in the space between the backing plate and the stamper. Injection is effected via a passage made at the center of the stamper mount, and the injected resin is stretched outwardly radially by pressing the backing plate. An ultraviolet ray is irradiated to the stretched resin through the backing plate to harden the resin. An injection valve movably received in the stamper-fixing shaft may be used so that uninjected resin is prevented from being hardened. The injection valve may have a center projection as well as a flange portion at its top so that machining for making a center hole of the disk is unnecessary. The periphery of the flange portion may be wetted by the resin before the backing plate is placed on the flange portion. The stretching speed of the resin is controlled so that air bubbles are prevented from being taken into the resin. The stamper may be attracted by magnetic forces to the stamper mount. A stamper having a fixing ring at its center may be used so that eccentricity is avoided.

REFERENCES:
patent: 2465276 (1949-03-01), Ryder
patent: 3023458 (1962-03-01), Seymour
patent: 3196485 (1965-07-01), Bottenfeld
patent: 3671158 (1972-06-01), Rand et al.
patent: 3749828 (1973-07-01), Konthe et al.
patent: 3969057 (1976-07-01), Pierre
patent: 4301099 (1981-11-01), Broeksema
patent: 4306852 (1981-12-01), Mateev
patent: 4312823 (1982-01-01), Kraakman
patent: 4315723 (1982-02-01), Antoine
patent: 4340353 (1982-07-01), Mayer
Patents Abstracts of Japan, vol. 5, No. 25, Feb. 14, 1981, p. 697M55.

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