Contact printer and method of making a filter for a contact prin

Details Contact printer and method of making a filter for a contact prin Contact printer and method of making a filter for a contact prin

1996-06-20

1998-06-02

Mathews, A. A.

Photocopying

Contact printing

Localized contrast modification

355125, 355132, 359888, 430 7, G03B 2772

Patent

active

057608822

ABSTRACT:
A method of improving uneven illumination in a contact printer having an original image position and a light source to illuminate the original image position, which light source may illuminate the original image position non-uniformly, the method comprising: first forming a mask by exposing a photographic element to the light source and processing the element to form a negative image of the light source at a filtering position between the light source and the original image position; and positioning the mask at the filtering position. A second aspect of the method uses an electronic processor and gathered illumination data, to generate a mask.

REFERENCES:
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patent: 2420141 (1947-05-01), Lessler
patent: 3312143 (1967-04-01), Karow et al.
patent: 4059481 (1977-11-01), Nagano
patent: 4298275 (1981-11-01), Critchlow et al.
patent: 4394089 (1983-07-01), McIntosh et al.
patent: 4472047 (1984-09-01), Stoudt
patent: 4575222 (1986-03-01), Ahern et al.

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