GB1328553A - Electronic flash tube - Google Patents

Electronic flash tube

Info

Publication number
GB1328553A
GB1328553A GB5271370A GB5271370A GB1328553A GB 1328553 A GB1328553 A GB 1328553A GB 5271370 A GB5271370 A GB 5271370A GB 5271370 A GB5271370 A GB 5271370A GB 1328553 A GB1328553 A GB 1328553A
Authority
GB
United Kingdom
Prior art keywords
capacitor
tube
flash
switching element
flash tube
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
GB5271370A
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 GB1328553A publication Critical patent/GB1328553A/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

1328553 Arrangement for controlling a flash tube PHILIPS ELECTRONIC and ASSOCIATED INDUSTRIES Ltd 5 Nov 1970 [8 Nov 1969] 52713/70 Heading G2A A control circuit for a flash tube 4, in which the flash tube is shunted by a circuit comprising a resistor 6, a switching element 7 and a capacitor 8, and wherein the duration of the flash is influenced by a control circuit of the switching element 7 which contains a photo-sensitive element 15, fed from a previously charged main capacitor 3. The capacitor 8 is included so that the main capacitor will not completely discharge after each flash. When taking a photograph, a voltage is applied between terminals 20 and 21 thereby igniting the flash tube 4 and charging a capacitor 14 via primary 5 and secondary 12 windings of a transformer. Light received by the photo-sensitive element 15 after being reflected off the object being photographed decreases its resistance causing a current to flow to a capacitor 18 which triggers switching element 7 when the voltage of the capacitor 18 is high enough. This allows current from the main capacitor 3 to flow through the shunt circuit 6, 7, 8 until the voltage on capacitors 3 and 8 has become substantially equal. Both capacitors 3 and 8 then discharge through flash tube 4, the current from the capacitor 8 going by way of diode 10. When the charge of the two capacitors 3 and 8 has decreased to the minimum operating voltage of the tube 4, the tube 4 is extinguished leaving a residual charge in the main capacitor 3. The controlled switching element can be a quench tube or a thyristor.
GB5271370A 1969-11-08 1970-11-05 Electronic flash tube Expired GB1328553A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6916883.A NL161032C (en) 1969-11-08 1969-11-08 EQUIPMENT EQUIPPED WITH AN ELECTRONIC FLASH LAMP.

Publications (1)

Publication Number Publication Date
GB1328553A true GB1328553A (en) 1973-08-30

Family

ID=19808346

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5271370A Expired GB1328553A (en) 1969-11-08 1970-11-05 Electronic flash tube

Country Status (9)

Country Link
US (1) US3716753A (en)
JP (1) JPS4832726B1 (en)
AT (1) AT316988B (en)
BE (1) BE758643A (en)
CH (1) CH527544A (en)
FR (1) FR2069108A5 (en)
GB (1) GB1328553A (en)
NL (1) NL161032C (en)
SE (1) SE354767B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3787704A (en) * 1970-02-20 1974-01-22 Loewe Opta Gmbh Electronic flash unit with controlled light energy
US3878433A (en) * 1971-11-17 1975-04-15 Sato Koki Kk Photographic flashlight apparatus with improved automatic light termination means
JPS4916421A (en) * 1972-06-01 1974-02-13
US3836818A (en) * 1973-02-22 1974-09-17 R Berglas Strobe light trigger circuit
DE2423527A1 (en) * 1974-05-15 1975-11-27 Rollei Werke Franke Heidecke ELECTRONIC FLASH DEVICE WITH EXPOSURE MEASURING AND FLASH LIMITING DEVICE
JPH09127578A (en) * 1995-11-02 1997-05-16 Olympus Optical Co Ltd Stroboscopic device
US10976794B2 (en) 2017-12-21 2021-04-13 Carrier Corporation Low latency power supply for notification appliance synchronization

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3340426A (en) * 1965-05-04 1967-09-05 Honeywell Inc Control system for terminating the discharge through a flash lamp
DE1772129A1 (en) * 1968-04-03 1971-11-11 Bosch Elektronik Gmbh Electronic flash unit
US3517255A (en) * 1968-07-25 1970-06-23 Honeywell Inc Flash apparatus with automatic light termination using light activated silicon controlled rectifier

Also Published As

Publication number Publication date
NL161032C (en) 1979-12-17
SE354767B (en) 1973-03-19
DE2053411A1 (en) 1971-05-19
FR2069108A5 (en) 1971-09-03
BE758643A (en) 1971-05-06
NL6916883A (en) 1971-05-11
JPS4832726B1 (en) 1973-10-08
DE2053411B2 (en) 1977-04-14
US3716753A (en) 1973-02-13
AT316988B (en) 1974-08-12
NL161032B (en) 1979-07-16
CH527544A (en) 1972-08-31

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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