Process for producing information recording medium

Details Process for producing information recording medium Process for producing information recording medium

1989-07-17

1991-01-01

Wityshyn, Michael G.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

1563082, 1565801, 346137, 360135, B29C 6500, B29C 6508

Patent

active

049815385

ABSTRACT:
Disclosed is a process for producing an information recording medium of air-sandwich type for optically recording or reproducing information which comprises an information recording disc and hubs provided on both sides at the center thereof. In the process, using a receiving tool provided with a disc-shaped raised portion for receiving a substrate at its center and a hub-receiving center axis extended upward from the center, a circular hole of the disc is fitted to the raised portion of the receiving tool, then a magnetizable hub having a magnetizable substance and a clamping hole at the center is fitted coaxially to the recording disc, and the hub is joined to the disc. Thereafter, the disc joined with the hub is turned over and fitted onto other receiving tool, and the other hub is joined to the disc. Otherwise, after one hub is joined to the recording disc on one side, another magnetizable hub may be joined to the back side of the recording disc by fitting the magnetizable hub to a different receiving tool and then fitting the above-obtained disc onto the magnetizable hub.

REFERENCES:
patent: 4549922 (1985-10-01), Oishi et al.
patent: 4698715 (1987-10-01), Oishi
patent: 4785444 (1988-11-01), Nakane et al.
patent: 4834819 (1989-05-01), Todo et al.
patent: 4836890 (1989-06-01), Murata et al.
patent: 4877667 (1989-10-01), Hattori et al.

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