US3576466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High intensity mercury-line source
Assignee: Individual
•
Filing: 1968-11-04
•
Granted: 1971-04-27
•
Expires: 1988-11-04
Abstract
Abstract The invention utilizes a tubular mercury vapor lamp for high intensity backlighting for use with the ballistic-synchro camera technique. In order to effectively eliminate the flicker inherent in such lamps because of the alternating current supply, threephase power is used with three ballasts and three full-wave bridge rectifiers, with the outputs of the rectifiers in parallel. Although with continual application of this power the lamp is overloaded, satisfactory control is achieved by operating the lamp on single phase for standby and switching on the other two phases just prior to event time and switching back to single phase when the object to be photographed has cleared the area.
Inventors
- 👤 William C Griffin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:53
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/16; H05B41/20; H05B41/23; H05B41/232; H05B41/234
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
244 words
Illuminating means comprising: a source of power having three current phases; a first ballast having a first terminal connected to a first of said current phases and a first diagonal of a fullwave rectifier, an intermediate portion connected to the second of said current phases, and a second terminal connected to said full-wave rectifier opposite to said first terminal; a second ballast having a first terminal connected to the second of said current phases and a first diagonal of a second full-wave rectifier, an intermediate portion connected to the third of said current phases, and a second terminal connected to said second full-wave rectifier opposite to said first terminal; a third ballast having a first terminal connected to the third of said current phases and a first diagonal of a third full-wave rectifier, an intermediate portion connected to the first of said current phases, and a second terminal connected to said third full-wave rectifier opposite to said first terminal; an illuminating device connected across the second diagonal of said full-wave rectifier; switch means for connecting in its closed position similarly poled ends of said second diagonals of said second and third rectifiers to said similarly poled end of said second diagonal of said full-wave rectifier, and for separately connecting opposite ends of said second diagonals to said opposite end of said second diagonal of said full-wave rectifier, whereby said illuminating device may be selectively operated in an overload condition on all three current phases.
Claim 2
Dependent Claim
244 words
Illuminating means comprising: a source of power having three current phases; a first ballast having a first terminal connected to a first of said current phases and a first diagonal of a fullwave rectifier, an intermediate portion connected to the second of said current phases, and a second terminal connected to said full-wave rectifier opposite to said first terminal; a second ballast having a first terminal connected to the second of said current phases and a first diagonal of a second full-wave rectifier, an intermediate portion connected to the third of said current phases, and a second terminal connected to said second full-wave rectifier opposite to said first terminal; a third ballast having a first terminal connected to the third of said current phases and a first diagonal of a third full-wave rectifier, an intermediate portion connected to the first of said current phases, and a second terminal connected to said third full-wave rectifier opposite to said first terminal; an illuminating device connected across the second diagonal of said full-wave rectifier; switch means for connecting in its closed position similarly poled ends of said second diagonals of said second and third rectifiers to said similarly poled end of said second diagonal of said full-wave rectifier, and for separately connecting opposite ends of said second diagonals to said opposite end of said second diagonal of said full-wave rectifier, whereby said illuminating device may be selectively operated in an overload condition on all three current phases.
Claim 3
Dependent Claim
57 words
An illuminating means as in claim 1 wherein said illuminating device is a mercury vapor lamp having a single-phase power rating and is operated at said power rating with said switch means in open position, and is operated above said power rating with said switch means in closed position for maximum light output, and substantially without flicker.
References Cited (Backward Citations)
US751016A
Cited
DE1069780B
Cited
US2122436A
Cited
US3227920A
Cited
US3222573A
Cited
US3339107A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |