Illumination control system
Abstract
Abstract AN ILLUMINATION CONTROL SYSTEM WHICH COMPENSATES FOR GRADUAL DIMMING OR DETERIORATION OF EXPOSURE LAMPS IN A PHOTOCOPYING MACHINE. THE ACCUMULATED NUMBER OF REPRODUCTIONS MADE BY THE REPRODUCING MACHINE CONTROLS THE CURRENT OUTPUT OF A VARIABLE CURRENT GENERATOR, WHICH IN TURN CONTROLS THE ILLUMINATION PROJECTED ONTO THE PHOTOCONDUCTIVE SURFACE IN ONE OF TWO WAYS. IN THE FIRST EMBODIMENT, THE CURRENT OUTPUT CONTROLS AN APERTURE SLIT MECHAISM POSITIONED BETWEEN THE SOURCE OF ILLUMINATION AND THE PHOTOCONDUCTIVE SURFACE, WIDENING THE SLIT AS THE ACCUMULATED NUMBER OF COPIES INCREASES. IN THE SECOND EMBODIMET, THE CURRENT OUTPUT IS COUPLED DIRECTLY TO THE SOURCE OF ILLUMINATION, THEREBY CONTROLLING THE AMOUNT OF ILLUMINATION IT GENERATES.
Inventors
- 👤 George T Bauer
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |