GB1396685A - Electronic flash gun for photographic picture-taking purposes - Google Patents

Electronic flash gun for photographic picture-taking purposes

Info

Publication number
GB1396685A
GB1396685A GB3214873A GB3214873A GB1396685A GB 1396685 A GB1396685 A GB 1396685A GB 3214873 A GB3214873 A GB 3214873A GB 3214873 A GB3214873 A GB 3214873A GB 1396685 A GB1396685 A GB 1396685A
Authority
GB
United Kingdom
Prior art keywords
switch
capacitor
flash
tube
electronic flash
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
Application number
GB3214873A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rollei Werke Franke und Heidecke GmbH and Co KG
Original Assignee
Rollei Werke Franke und Heidecke GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Rollei Werke Franke und Heidecke GmbH and Co KG filed Critical Rollei Werke Franke und Heidecke GmbH and Co KG
Publication of GB1396685A publication Critical patent/GB1396685A/en
Expired legal-status Critical Current

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

  • Stroboscope Apparatuses (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)

Abstract

1396685 Electronic flash control FRANKE & HEIDECKE GmbH 5 July 1973 [10 Aug 1972] 32148/73 Heading G2A Closing an ignition switch 8 discharges a capacitor 7 through a transformer 10 to ionize a flash tube 2 connected to a storage capacitor 3 by a resistor 14, and the resulting positive pulse is conducted via capacitors 18, 26 and a voltage divider 27, 28 to fire a thyristor 17 which shorts out resistor 14 and provides a full flash current flow through tube 2. This ensures that the tube is ionized before commencement of the main discharge. The light reflected from the object is detected by a photo-electric measuring device 21 which at a pre-set level fires a switch 19 whereby capacitor 18 discharges to provide a reverse current flow through switch 17 and via capacitor 26 and divider 27, 29 to provide a negative pulse on the control electrode 29 of switch 17. This switches off switch 17 to terminate the flash. The negative pulse on the electrode 29 reduces the time required for switch 17 to switch off and therefore reduces the capacitance required of capacitor 18.
GB3214873A 1972-08-10 1973-07-05 Electronic flash gun for photographic picture-taking purposes Expired GB1396685A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722239324 DE2239324B2 (en) 1972-08-10 1972-08-10 ELECTRON FLASH LAMP FOR PHOTOGRAPHIC PURPOSES

Publications (1)

Publication Number Publication Date
GB1396685A true GB1396685A (en) 1975-06-04

Family

ID=5853200

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3214873A Expired GB1396685A (en) 1972-08-10 1973-07-05 Electronic flash gun for photographic picture-taking purposes

Country Status (3)

Country Link
DE (1) DE2239324B2 (en)
GB (1) GB1396685A (en)
HK (1) HK82576A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4132923A (en) * 1976-07-01 1979-01-02 Braun Aktiengesellschaft Circuit for light-integrator-controlled electronic flash unit
US4228381A (en) * 1977-10-06 1980-10-14 Nippon Kogaku K.K. Flash tube apparatus with delayed emission

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4132923A (en) * 1976-07-01 1979-01-02 Braun Aktiengesellschaft Circuit for light-integrator-controlled electronic flash unit
US4228381A (en) * 1977-10-06 1980-10-14 Nippon Kogaku K.K. Flash tube apparatus with delayed emission

Also Published As

Publication number Publication date
HK82576A (en) 1977-01-07
DE2239324B2 (en) 1977-01-13
DE2239324A1 (en) 1974-02-21

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Legal Events

Date Code Title Description
PS Patent sealed
433D Application made for revocation (sect. 33/1949)
433C Case decided by the comptroller ** specification amended (sect. 33/1949)
PCNP Patent ceased through non-payment of renewal fee
SP Amendment (slips) printed