Industry Patents
Patent: 3968401
Apparatus for Controlling the Intensity of a Light Source
(Click image for PDF of full patent)
| Patent Number: |
3968401 |
| Title: |
Apparatus for Controlling the Intensity of a Light Source |
| Abstract: |
An enabling circuit selectively generates first, second and third enabling
signals. The first enabling signal enables a pulse generator means which
generates a train of clock pulses. The second enabling signal enables a
gating means which applies the clock pulses generated by the pulse
generator means to the up input terminal of an up/down counter. The third
enabling signal enables a gating means which applies the clock pulses
generated by the pulse generator means to the down input terminal of the
up/down counter. The up/down counter evaluates the difference between the
number of clock pulses applied to its up input terminal and the number of
clock pulses applied to its down input terminal and generates a digital
signal representative of the evaluation. Finally, digital to analog
converter means generates an analog output control signal whose magnitude
is determined by the digital generated by the up/down counter.
|
| Country of Issue: |
US |
| First Named Inventor: |
Bryant |
| Assignee: |
Strand Century |
| Continuation or Divisional of: |
|
| International Classification: |
H05B 41/392 |
| US Classification: |
315/293 |
| Issue Date: |
07-06-1976 |
| Filing Date: |
11-27-1974 |
| Application : |
527923 |
| Notes: |
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| Link to Patent at freepatentsonline.com: |
3968401 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
3968401 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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