Method of manufacturing a shear plate for a dry-shaver

Details Method of manufacturing a shear plate for a dry-shaver Method of manufacturing a shear plate for a dry-shaver

1989-04-11

1991-05-21

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Making named article

430323, 430394, 3034651, G03C 500

Patent

active

050174606

ABSTRACT:
The invention relates to a method of manufacturing a shear plate for a dry-shaver, which shear plate is formed with perforations, at least one side of a metal sheet being provided with a layer of a photosensitive material, which photosensitive material is exposed to radiation via a mask formed with a pattern of holes corresponding to the pattern of the perforations, after which the photosensitive material is developed and the perforations are formed in the metal sheet by etching. In accordance with the method a positive photosensitive material is used and in at least two stages at least two masks are employed, the method as defined above being carried out using a first mask and, subsequently, in the second stage using a second mask that part of the positive photosensitive material which was covered by the first mask being exposed to radiation, upon which said material is developed and the etching process is continued.

REFERENCES:
patent: 3179543 (1965-04-01), Marcelis

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