Grinder for grinding stamper used for disc molding

Details Grinder for grinding stamper used for disc molding Grinder for grinding stamper used for disc molding

1992-11-30

1995-01-03

Lavinder, Jack W.

Abrading

Precision device or process - or with condition responsive...

451306, 451307, 451 11, 451 57, B24B 2106

Patent

active

053774523

ABSTRACT:
A grinding apparatus for grinding a stamper for forming a signal recording part, of an information signal recording disc is disclosed. The grinding apparatus includes a turntable holding and rotationally driving the stamper and an abrasive head for bringing a mounting surface of the stamper opposite to its surface carrying projections and recesses for molding the signal recording part of the information signal recording disc into sliding contact with an abrasive member. The rotational velocity of the turntable is controlled depending on the position of the abrasive head with respect to the stamper for rendering the relative speed of sliding contact between the stamper and the abrasive member constant for uniform grinding of the mounting surface of the stamper uniformly across its inner and outer peripheries.

REFERENCES:
patent: 4964242 (1990-10-01), Ruble
patent: 5018311 (1991-05-01), Malagrino, Jr.
patent: 5193314 (1993-03-01), Wormley

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