Photocell controlled diaphragm
Abstract
Abstract A MOTION PICTURE DIAPHRAGM CONTROL MECHANISM INCLUDES A PHOTOCONDUCTOR AND RESISTOR CONNECTED IN SERIES ACROSS A VOLTAGE SOURCE THE JUNCTION BEING CONNECTED THROUGH A SWITCH TO THE INPUT OF A DARLINGTON AMPLIFIER. AN ADJUSTABLE DIAPHRAGM IS CONNECTED TO THE ARMATURE OF A METER MOVEMENT WHOSE WINDING IS CONNECTED BETWEEN A VOLTAGE TERMINAL AND THE COLLECTOR OF THE AMPLIFIER OUTPUT TRANSISTOR, THE EMITTER THEREOF BEING ROUNDED THROUGH A FIRST VARIABLE RESISTOR. A MEMORY CAPACITOR SHUNTS THE AMPLIFIER INPUT. A SECOND VARIABLE RESISTOR MAY BE CONNECTED THROUGH A SWITCH ACROSS THE CAPACITOR AND THE CAPACITOR MAY BE CONNECTED TO THE VOLTAGE SOURCE THROUGH A THIRD VARIABLE TRANSISTOR AND SWITCH.
Inventors
- 👤 Tsukumo Nobusawa
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 |