GB1484803A - Electronic flash unit - Google Patents
Electronic flash unitInfo
- Publication number
- GB1484803A GB1484803A GB3222775A GB3222775A GB1484803A GB 1484803 A GB1484803 A GB 1484803A GB 3222775 A GB3222775 A GB 3222775A GB 3222775 A GB3222775 A GB 3222775A GB 1484803 A GB1484803 A GB 1484803A
- Authority
- GB
- United Kingdom
- Prior art keywords
- thyristor
- tube
- flash
- capacitor
- lamp
- 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
- H05B41/325—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp for single flash operation by measuring the incident light
Landscapes
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
- Stroboscope Apparatuses (AREA)
Abstract
1484803 Electronic flash units FRANKE & HELDECKE GmbH 1 Aug 1975 [10 Aug 1974] 32227/75 Heading G2A An electronic flash unit comprises a flash tube 2 in series with a thyristor 3, a flash measuring device 16 for blocking the thyristor 3 after receipt of a predetermined quantity of light from the tube 2, a capacitor 12 connected in parallel with the thyristor 3 so as to charge during the time between blocking of the thyristor 3 and quenching of the tube 2 and means, preferably a lamp 15, to indicate when the charge on capacitor 12 reaches a predetermined level lighting up of lamp 15 thus indicates that device 16 has worked properly. When thyristor 3 is turned on again for the next flash, capacitor 12 discharges through it, if it hasn't already discharged through resistors 13, 14, so that lamp 15 is extinguished and ready for use again. In Fig. 1 the ignition circuit 5 to 8 ignites tube 2 and thyristor 3 simultaneously. In Fig. 2 (not shown) the tube (22) is ignited first, and the resulting voltage pulse through capacitors (29, 33) turns on the thyristor (23). In this circuit a resistor (32) has to be connected in parallel with the thyristor (32) and as a consequence diodes (37, 42) are connected in the charging and discharging paths of the lamp control capacitor (38). A prior art arrangement is described in which the flash tube is short circuited by a quench tube which lights up for a few milliseconds, light being transmitted from the quench tube to a fluorescent disc by a light pipe for indication purposes. The afterglow of.the disc makes this indicator arrangement ineffective when a rapid succession of flashes is used.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19742438541 DE2438541B2 (en) | 1974-08-10 | 1974-08-10 | ELECTRON FLASH DEVICE |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1484803A true GB1484803A (en) | 1977-09-08 |
Family
ID=5922929
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3222775A Expired GB1484803A (en) | 1974-08-10 | 1975-08-01 | Electronic flash unit |
Country Status (4)
Country | Link |
---|---|
JP (1) | JPS5142531A (en) |
DE (1) | DE2438541B2 (en) |
GB (1) | GB1484803A (en) |
HK (1) | HK10981A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5384349U (en) * | 1976-12-14 | 1978-07-12 | ||
JPS5410728A (en) * | 1977-06-25 | 1979-01-26 | Sunpak Kk | Device for confirming lighttadjustment operation in lighttadjusting strobo |
JPS5636635A (en) * | 1979-08-31 | 1981-04-09 | Canon Inc | Dimming check display device in dimming strobe |
-
1974
- 1974-08-10 DE DE19742438541 patent/DE2438541B2/en not_active Withdrawn
-
1975
- 1975-08-01 GB GB3222775A patent/GB1484803A/en not_active Expired
- 1975-08-11 JP JP9744275A patent/JPS5142531A/en active Pending
-
1981
- 1981-03-26 HK HK10981A patent/HK10981A/en unknown
Also Published As
Publication number | Publication date |
---|---|
HK10981A (en) | 1981-04-03 |
DE2438541B2 (en) | 1977-12-22 |
JPS5142531A (en) | 1976-04-10 |
DE2438541A1 (en) | 1976-02-19 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |