Recording disc and method of producing same

Details Recording disc and method of producing same Recording disc and method of producing same

1995-04-03

1996-10-01

Levy, Stuart S.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

369290, 369291, 264255, 2643288, B29C 4504, G11B 2300

Patent

active

055608809

ABSTRACT:
A chucking hub member welded to a disc substrate includes a circular metal plate, an outer plastic ring molded on and around an outer peripheral portion of the metal plate, and an inner plastic ring molded on and around a peripheral portion of a circular center opening of the metal plate. The outer and inner plastic rings are produced by injecting melted plastic into both a first cavity portion defined about the outer peripheral portion of the metal plate and a second cavity portion defined about the peripheral portion of the circular center opening of the metal plate. The first and second cavity portions have respective inlet openings which face toward the same direction.

REFERENCES:
patent: 4743994 (1988-05-01), Kato et al.
patent: 4785444 (1988-11-01), Nakane et al.
patent: 4787009 (1988-11-01), Takahashi
patent: 4926410 (1990-05-01), Suzuki et al.
patent: 5020207 (1991-06-01), Minoda et al.
patent: 5226033 (1993-07-01), Takahashi
patent: 5289456 (1994-02-01), Takahashi
patent: 5448553 (1995-09-01), Suzuki et al.

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