Photographic contrast control device

Details Photographic contrast control device Photographic contrast control device

1984-01-19

1985-08-27

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 1, 354202, G03B 2754

Patent

active

045375003

ABSTRACT:
A contrast control device fogs a photographic recording medium with diffuse light simultaneously with the imaging of that medium. The diffuse light is colinear with the imaging light. The contrast control includes a semi-transparent mirror arranged diagonally across the light path. A fiber optic cable collects diffuse light and delivers it at a right angle to the cone of imaging light. This diffuse light also passes through the partial mirror and is received by a reflector. The reflector converts the diffuse light into a diffuse cone of light which approximates the imaging cone of light. This second or diffuse cone of light is reflected onto the partial mirror which in turn, reflects it onto the photographic medium substantially colinear with the imaging cone of light.

REFERENCES:
patent: 2135575 (1938-11-01), Hansch et al.
patent: 2556307 (1951-06-01), Walker
patent: 3575510 (1971-04-01), Kohashi
patent: 3854815 (1974-12-01), McIntosh
patent: 4021831 (1977-05-01), Bercher
patent: 4172640 (1979-10-01), Land

Affiliated with

Also associated with

Rating

Photographic contrast control device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Photographic contrast control device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photographic contrast control device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1999584