Industry Patents
Patent: 3883243
Light Color Regulating Apparatus
(Click image for PDF of full patent)
| Patent Number: |
3883243 |
| Title: |
Light Color Regulating Apparatus |
| Abstract: |
The disclosed apparatus forms part of the lamp house in a photographic
enlarger. Three dichroic filters partially intercept a white light beam
emerging from a light source. The filters divide the beam into a white
portion and an intensely colored portion. A mixing chamber receives the
beam to mix the white and intensely colored light which is used to
illuminate a color slide or negative having a color image. Suitable
controls coupled to the filters move the filters into and out of the beam
along a continuous path between predetermined limits that define the
maximum and minimum color densities of the light emerging from the
chamber. A number of readouts coupled to the controls display the extent
to which the filters have been moved between the limits and represent the
colored density of the position of the filters. The readouts exhibit a
given reading for a predetermined color and density. When the character of
the beam is changed by changing the source, it is necessary for the
controls to readjust the filters to different positions in order to obtain
the predetermined color and density. A coupler decouples the readouts from
the controls so that the readouts can be set to the same readings for the
predetermined color and density when the controls cause the filters to
produce the predetermined color and density. The controls and readouts are
then recoupled.
|
| Country of Issue: |
US |
| First Named Inventor: |
Weisglass, Flieder |
| Assignee: |
Berkey Photo |
| Continuation or Divisional of: |
|
| International Classification: |
G03B 27/76 |
| US Classification: |
355/35 |
| Issue Date: |
05-13-1975 |
| Filing Date: |
09-25-1973 |
| Application : |
400646 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
3883243 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
3883243 at Google Patents |
1. The Google Patents and World Patent Family links will likely not work until a few weeks
after the patent has issued - they take a while to get new patents in their systems.
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