Process for producing information recording medium

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

1988-04-04

1990-06-12

Ryan, Patrick

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428908, 428913, 346 76L, 3461351, 346137, 369284, 430945, B32B 302

Patent

active

049332228

ABSTRACT:
A process for producing an information recording medium such as an optical disc comprises the steps: putting a disc-shaped flexible resin film having a hole at its central part upon a surface of the recording layer-side of a disc-shaped resin substrate; placing them on a ultrasonic welding machine between its applying horn and its receiving tool in such a manner that the resin film and the applying horn are opposed to each other, wherein the horn has a ring-shaped protrusion provided with a raised portion; and applying ultrasonic wave to them while pressing the resin film to weld the resin film to the substrate.

REFERENCES:
patent: 4353767 (1982-10-01), Wilkinson
patent: 4539673 (1985-09-01), Winslow
patent: 4564932 (1986-01-01), Lange
patent: 4590493 (1986-05-01), Inoue et al.
patent: 4644520 (1987-02-01), Lange
patent: 4758063 (1988-07-01), Konechny, Jr.

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