GB1328655A - Arrangement for an electronic flash tube - Google Patents

Arrangement for an electronic flash tube

Info

Publication number
GB1328655A
GB1328655A GB5271470A GB5271470A GB1328655A GB 1328655 A GB1328655 A GB 1328655A GB 5271470 A GB5271470 A GB 5271470A GB 5271470 A GB5271470 A GB 5271470A GB 1328655 A GB1328655 A GB 1328655A
Authority
GB
United Kingdom
Prior art keywords
capacitor
flash
diode
rectifier
control 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
Application number
GB5271470A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
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 Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1328655A publication Critical patent/GB1328655A/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
    • 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)
  • Exposure Control For Cameras (AREA)

Abstract

1328655 Arrangement for electronic flash tube PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 5 Nov 1970 [8 Nov 1969] 52714/70 Heading G2A In an electronic circuit wherein the flashing duration of a flash tube 8 is determined by a control circuit containing a photo-sensitive element 22 connected to a controlled semiconductive rectifier 15, the energy lost by a main capacitor or energy source 3 is minimised by means of a second capacitor 12, connected so as to oppose the current causing the flash, which is usually isolated by a diode 14 and controlled semi-conductive rectifier 15 and thereby only allowed to discharge (terminating the flash) when the semi-conductor 15 in the control circuit is rendered conducting. A diode 16 and resistor 17 serve to provide means by which the second capacitor 12 may be charged initially together with the capacitor 3. In operation, a voltage is applied between the parts 18 and 19 and trigger electrode 20 of the tube 8 when a shutter mechanism of a photographic camera is actuated. The shutter mechanism also closes the switch 24 in the control circuit of controlled semi-conductive rectifier 15. The controlled semi-conductive rectifier 15 is actuated after the quantity of light, received by the photosensitive 22, which is reflected off the object being photographed is such that the battery 21 is able to charge a capacitor 25, as shown, to the necessary voltage to start conduction. In a further embodiment the capacitor 12 is replaced by a small battery with the diode 14 being replaced by a switching element.
GB5271470A 1969-11-08 1970-11-05 Arrangement for an electronic flash tube Expired GB1328655A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6916884.A NL160141C (en) 1969-11-08 1969-11-08 EQUIPMENT EQUIPPED WITH AN ELECTRONIC FLASH LAMP AND A POWER CONDENSER FOR THIS.

Publications (1)

Publication Number Publication Date
GB1328655A true GB1328655A (en) 1973-08-30

Family

ID=19808347

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5271470A Expired GB1328655A (en) 1969-11-08 1970-11-05 Arrangement for an electronic flash tube

Country Status (9)

Country Link
US (1) US3696268A (en)
JP (1) JPS4840420B1 (en)
AT (1) AT324120B (en)
BE (1) BE758644A (en)
CH (1) CH527545A (en)
FR (1) FR2069109A5 (en)
GB (1) GB1328655A (en)
NL (1) NL160141C (en)
SE (1) SE354768B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2065904A (en) * 1979-11-07 1981-07-01 Fuji Koeki Corp Electronic flash device

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2128703B2 (en) * 1968-02-13 1977-12-23 Lumina Sprl
US3849703A (en) * 1971-07-06 1974-11-19 Shindengen Electric Mfg Electronic flash apparatus
GB1375460A (en) * 1971-11-25 1974-11-27
JPS49102334A (en) * 1973-01-31 1974-09-27
KR101201320B1 (en) * 2005-12-28 2012-11-14 엘지디스플레이 주식회사 Apparatus and method for driving of liquid crystal display device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1472579A1 (en) * 1965-07-10 1969-02-20 Agfa Gevaert Ag Photographic camera with a device running from an end position for changing the aperture size
US3568582A (en) * 1967-09-27 1971-03-09 Konishiroku Photo Ind Electronic shutter
US3473084A (en) * 1967-12-06 1969-10-14 Automatic Power Inc Constant intensity lamp control with an optical feedback control

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2065904A (en) * 1979-11-07 1981-07-01 Fuji Koeki Corp Electronic flash device

Also Published As

Publication number Publication date
NL160141B (en) 1979-04-17
US3696268A (en) 1972-10-03
NL6916884A (en) 1971-05-11
AT324120B (en) 1975-08-11
SE354768B (en) 1973-03-19
JPS4840420B1 (en) 1973-11-30
FR2069109A5 (en) 1971-09-03
BE758644A (en) 1971-05-06
DE2053429B2 (en) 1977-05-05
CH527545A (en) 1972-08-31
NL160141C (en) 1979-09-17
DE2053429A1 (en) 1971-05-19

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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