GB589037A - Improvements relating to electric lighting systems - Google Patents
Improvements relating to electric lighting systemsInfo
- Publication number
- GB589037A GB589037A GB978544A GB978544A GB589037A GB 589037 A GB589037 A GB 589037A GB 978544 A GB978544 A GB 978544A GB 978544 A GB978544 A GB 978544A GB 589037 A GB589037 A GB 589037A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lamp
- condenser
- resistance
- projector
- duration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/30—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp
- H05B41/34—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp to provide a sequence of flashes
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
589,037. Kinematograph projectors. SIEMENS ELECTRIC LAMPS & SUPPLIES, Ltd., and ALDINGTON, J. N. June 15, 1945, No. 9785/44. [Class 97 (i)] [Also in Groups XXXV and XL] An electric discharge lamp L (see Group XL) for use in a kinematograph projector is metallically connected across a capacitance C2 charged from a direct current source through a resistance R3 to a peak voltage less than the fundamental breakdown voltage of the lamp ; rapidly recurrent impulses of high voltage (not less than 24 per second and preferably 50 or even 100 per second) are applied to the lamp, e.g. from a spark coil S whereby breakdown occurs at each impulse and the capacitance is discharged across the lamp producing a high current density discharge of short duration. The duration of current flow may be not more than one per cent of the duration of operation, the peak current during an impulse being not less than one hundred times that which the lamp could carry on steady load. The lamp may be cooled by water or air-blast particularly when near the condenser of the projector. In the arrangement shown one end. of the secondary of the coil S is wrapped round the tube L. Periodic excitation of the primary is effected bydischarge of a condenser C1 through the plate circuit of a gas valve TH the condenser being charged from a voltage source through a resistance R2 ; the rate of flashing may be controlled by the values of the resistance and the condenser or by controlling the application of bias to the grid of the valve, e.g. the intermittent feed of the projector may be arranged periodically to short-circuit a resistance across the terminals e, f. Alternatively control may be exercised photo-electrically from a track on the film. Specifications 569,267, 579,686 and 586,685, [all in Group XL], are referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB978544A GB589037A (en) | 1945-06-15 | 1945-06-15 | Improvements relating to electric lighting systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB978544A GB589037A (en) | 1945-06-15 | 1945-06-15 | Improvements relating to electric lighting systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB589037A true GB589037A (en) | 1947-06-10 |
Family
ID=9878710
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB978544A Expired GB589037A (en) | 1945-06-15 | 1945-06-15 | Improvements relating to electric lighting systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB589037A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1051406B (en) * | 1955-08-19 | 1959-02-26 | Fernseh Gmbh | Arrangement for the ignition and operation of a gas discharge tube with an external electrode (light flash or stroboscope tube) |
DE1104061B (en) * | 1956-11-09 | 1961-04-06 | Licentia Gmbh | Arrangement to improve the ignition of fluorescent lamps controlled by phase control |
-
1945
- 1945-06-15 GB GB978544A patent/GB589037A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1051406B (en) * | 1955-08-19 | 1959-02-26 | Fernseh Gmbh | Arrangement for the ignition and operation of a gas discharge tube with an external electrode (light flash or stroboscope tube) |
DE1104061B (en) * | 1956-11-09 | 1961-04-06 | Licentia Gmbh | Arrangement to improve the ignition of fluorescent lamps controlled by phase control |
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