Additive lamphouse for contact printing

Details Additive lamphouse for contact printing Additive lamphouse for contact printing

1976-01-12

1978-03-21

Braun, Fred L.

Photocopying

Contact printing

Multicolor printing

355 32, 355 71, 355132, G03B 2704

Patent

active

040800725

ABSTRACT:
A novel device for use as an additive lamphouse in contact printing. White light is emitted by a source, collimated and then passed through a dispersion element to form a spectrum. The light is then selectively attenuated by wavelength to allow exact control of the color mixture of the light which falls on the negative and the positive contact. The use of a dispersion element rather than the dichroic principle of the prior art allows selective control of the color mixture of the light incident to the negative and thus to the contact by providing an improved control of the homogenuity of the color across the illuminated field. Also the problem of "color wedging" has been markedly reduced. The contact printer according to the present invention is more compact than those of the prior art and may be produced at a reduced cost.

REFERENCES:
patent: 1935422 (1933-11-01), Vidal
patent: 2024522 (1935-12-01), Harrison
patent: 2052625 (1936-09-01), Harrison
patent: 2741944 (1956-04-01), Gunther
patent: 2780155 (1957-02-01), Debrie
patent: 3075432 (1963-01-01), Myers
patent: 3260152 (1966-07-01), Aston
patent: 3521954 (1970-07-01), French

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