Industry Patents
Patent: 3754824
Light Color Control Apparatus
(Click image for PDF of full patent)
| Patent Number: |
3754824 |
| Title: |
Light Color Control 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 having an elliptical reflector. The filters
divide the beam into a white portion and an intensely colored portion. The
beam enters a mixing chamber wherein white-opaque side walls and a ceiling
coact with each other to mix the white and intensely colored light. The
light exits through a diffuser at the bottom of the chamber and passes
through a color slide or negative having a color image. An optical system
focuses the image on printing paper. Three pivotally mounted filter
holders support the filters in their respective positions. Three cams
movable by manually adjustable wheels control the positions of the
holders. A control arm engageable with all three of the holders
simultaneously draws the filter holders out of engagement with the cams
until the filters are removed from the beam. A regulating arm moves an
attenuator into the path of the beam.
|
| Country of Issue: |
US |
| First Named Inventor: |
Weisglass, Flieder, Rubin |
| Assignee: |
Berkey Photo |
| Continuation or Divisional of: |
|
| International Classification: |
G03B 27/76 |
| US Classification: |
355/35 |
| Issue Date: |
08-28-1973 |
| Filing Date: |
12-14-1971 |
| Application : |
207809 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
3754824 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
3754824 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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