US3702732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exposure control apparatus and method utilizing time vs intensity tradeoff servo system
Assignee: Prime Computer Inc
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Filing: 1971-05-05
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Granted: 1972-11-14
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Expires: 1991-05-05
Abstract
Abstract AN EXPOSURE CONTROL APPARATUS AND METHOD WITH UTILIZES A TIME VS. LAMP INTENSITY TRADEOFF SERVO SYSTEM. THE LAMP INTENSITY IS REGULATED BY THE SERVO SYSTEM TO PROVIDE THE MINIMUM AMOUNT OF LAMP DRIVE OR INTENSITY THAT WILL PRODUCE A PREDETERMINED EXPOSURE WITHIN THE AVAILABLE EXPOSURE TIME. A TWO STATE GAIN ADJUSTMENT IS EMPLOYED IN THE SERVO SYSTEM TO PERMIT RAPID CONVERGENCE AT A HIGH GAIN AND THEN A CONTROLLED, AND SMALL RIPPLE OF LIGHT INTENSITY AT A LOWER GAIN. THE SERVO SYSTEM AUTOMATICALLY COMPENSATES FOR LAMP INTENSITY DECAY DURING LAMP AGAING WITHOUT REQUIRING A HIGH INITIAL POWER DRIVE.
Inventors
- 👤 Joseph J Sliwkowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:03
CPC Classifications
G; G06; G06K; G06K15/00; G06K15/22; G06K15/225
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-14 | 1976-05-15 | 1976-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-14 | 1980-05-15 | 1980-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-14 | 1984-05-15 | 1984-11-14 | $7700.00 | Window Closed / Lapsed |