GB1251701A - - Google Patents
Info
- Publication number
- GB1251701A GB1251701A GB1251701DA GB1251701A GB 1251701 A GB1251701 A GB 1251701A GB 1251701D A GB1251701D A GB 1251701DA GB 1251701 A GB1251701 A GB 1251701A
- Authority
- GB
- United Kingdom
- Prior art keywords
- capacitor
- lamp
- glow lamp
- transistor
- circuit
- 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
- H05B41/32—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp for single flash operation
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
Abstract
1,251,701. Supplying photoflash lamps. NIPPON KOGAKU K.K. 7 Feb., 1969 [23 Feb., 1968], No. 6761/69. Heading H2H. [Also in Division G3] A circuit for supplying a photoflash discharge lamp includes a glow lamp which determines the maximum and minimum voltages to which a capacitor is charged. The charge on the capacitor is thus kept substantially constant to provide uniform output when the lamp is operated. As shown in Fig. 1, a capacitor 4 is charged from a D.C. source 1 through a converter 3. When the capacitor reaches a certain voltage, a glow lamp 8 breaks down allowing current to flow through a transistor 9 to a circuit 12 which inhibits the converter 3 so that charging of the capacitor stops. The gating of the transistor also reduces the voltage across the glow lamp 8, but this remains conductive until the capacitor has discharged slightly. When the glow lamp blocks, the transistor is also cut off so that Charging starts again until the glow lamp restrikes. The maximum and minimum voltages can be adjusted using potentiometers 6, 7. The lamp 14 is flashed by a trigger circuit 13 when a synchronizing switch 15 is closed.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1338668 | 1968-02-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1251701A true GB1251701A (en) | 1971-10-27 |
Family
ID=11831638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1251701D Expired GB1251701A (en) | 1968-02-23 | 1969-02-07 |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US3586906A (en) |
| GB (1) | GB1251701A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2419645A1 (en) * | 1978-03-06 | 1979-10-05 | Balda Werke Photographische | ELECTRONIC LIGHT LAMP WITH CHARGE CONTROL EFFLUVES LAMP |
| EP0135756A1 (en) * | 1983-08-08 | 1985-04-03 | Life Light Systems | High voltage flash lamp circuit and emergency signal |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3780344A (en) * | 1971-09-07 | 1973-12-18 | Gte Sylvania Inc | Charge regulating circuit for flash lamp storage capacitor |
| US3993929A (en) * | 1975-12-19 | 1976-11-23 | Honeywell Inc. | Automatic correct exposure indicator |
-
1969
- 1969-02-07 US US797625A patent/US3586906A/en not_active Expired - Lifetime
- 1969-02-07 GB GB1251701D patent/GB1251701A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2419645A1 (en) * | 1978-03-06 | 1979-10-05 | Balda Werke Photographische | ELECTRONIC LIGHT LAMP WITH CHARGE CONTROL EFFLUVES LAMP |
| EP0135756A1 (en) * | 1983-08-08 | 1985-04-03 | Life Light Systems | High voltage flash lamp circuit and emergency signal |
Also Published As
| Publication number | Publication date |
|---|---|
| US3586906A (en) | 1971-06-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |