Stamper

Details Stamper Stamper

1994-08-16

1995-10-17

Zimmerman, John

Stock material or miscellaneous articles

All metal or with adjacent metals

Having variation in thickness

428621, 428630, 428662, 428667, 428680, 428686, 428934, 425385, 425DIG30, G11B 726, B32B 318, B32B 700

Patent

active

054589851

ABSTRACT:
A method of manufacturing a stamper includes the steps of coating a flat surface of a substrate with photosensitive material; directing light to a specified position on the photosensitive material to expose it; developing the photosensitive material to make a minute photoresist pattern; etching the substrate to a specified depth with a mask of the photoresist pattern; removing the photoresist as the mask to make a glass master; arbitrarily forming a first nickel layer on a surface of the glass master; forming an intermediate layer of a metal having a smaller linear expansion coefficient than nickel over the first nickel layer; forming a second nickel layer on the intermediate layer to form a conductive film having a two- or three-stratum structure; arbitrarily subjecting the whole substrate to a process to make nickel passive; forming an electroformed layer on the conductive film by an electroforming process; and separating the conductive film from the glass master.

REFERENCES:
patent: 3478684 (1969-11-01), Schafler et al.
patent: 3532587 (1970-10-01), Unger et al.
patent: 3558290 (1971-01-01), Baier et al.
patent: 3715793 (1973-02-01), Kefalas et al.
patent: 4262875 (1981-04-01), Nyman et al.
patent: 4500392 (1985-02-01), Slaten
patent: 4563145 (1980-01-01), de Meij
patent: 4565772 (1986-01-01), Takeoka et al.
patent: 4723903 (1988-02-01), Okazaki et al.
Translation of Japanese Kokai Patent Publication 2-77,594, Mar. 1990, Tsucniya, Y., pp. 1-5.
Abstract for JP 3036021, Feb. 1991. 1 page.

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