Injection mold for an optical disk

Details Injection mold for an optical disk Injection mold for an optical disk

1986-10-30

1988-05-03

Hoag, Willard E.

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

249160, 425808, 425812, B29C 4534

Patent

active

047416890

ABSTRACT:
An injection mold for injection molding a plastic substrate for high-density information recording medium. An annular sliding member is axially slidably supported in the circumference of a disk-shaped cavity of a mold half. The annular sliding member is biased toward the surface of a disk-shaped cavity provided in another mold half so as to form the molding cavity and maintain contact with said surface during molding of said plastic substrate.

REFERENCES:
patent: 1029488 (1912-06-01), Burghoff et al.
patent: 2998622 (1961-09-01), Renoux
patent: 3991971 (1976-11-01), Drake
patent: 4085178 (1978-04-01), McNeely et al.
patent: 4118168 (1978-10-01), Rees et al.
patent: 4395211 (1983-07-01), Broeksema et al.
patent: 4452748 (1984-06-01), Lange et al.

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