GB1374247A - - Google Patents

Info

Publication number
GB1374247A
GB1374247A GB2016374A GB2016374A GB1374247A GB 1374247 A GB1374247 A GB 1374247A GB 2016374 A GB2016374 A GB 2016374A GB 2016374 A GB2016374 A GB 2016374A GB 1374247 A GB1374247 A GB 1374247A
Authority
GB
United Kingdom
Prior art keywords
capacitor
thyristor
tube
turns
photo
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
GB2016374A
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.)
Ponder & Best
Original Assignee
Ponder & Best
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 Ponder & Best filed Critical Ponder & Best
Publication of GB1374247A publication Critical patent/GB1374247A/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
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G03B15/03—Combinations of cameras with lighting apparatus; Flash units
    • G03B15/05—Combinations of cameras with electronic flash apparatus; Electronic flash units
    • 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
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B2215/00—Special procedures for taking photographs; Apparatus therefor
    • G03B2215/05—Combinations of cameras with electronic flash units

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Stroboscope Apparatuses (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
  • Exposure Control For Cameras (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)

Abstract

1374247 Photo-flash control circuit PONDER & BEST Inc 24 Aug 1971 [11 June 1971] 20163/74 Divided out of 1374245 Heading G2A A flash tube 594 is energized by pulses from a generator 593, a photo-detector circuit 596 being connected to the generator to terminate pulse generation on receipt of a predetermined quantity of light. As shown, a pulse from a trigger circuit 595 triggers tube 594 and via capacitor 59304 and capacitor 59307 switches on transistor 59306 to turn on a thyristor 59301. This causes a supply capacitor 592 to discharge through a capacitor 59304 and tube 594 until capacitor 59304 is charged. This turns off thyristor 59301, and turns on thyristor 59302 whereby capacitor 59304 discharges through the tube. When capacitor 59304 is discharged thyristor 59302 turns off, thyristor 59301 turns on and capacitor 592 again discharges. This process is repeated to energize tube 594 by means of pulses until a photo-detecting integrating circuit blocks thyristor 59302 to prevent further generation. The charge remaining on supply capacitor 591 is thus conserved.
GB2016374A 1970-08-24 1971-08-24 Expired GB1374247A (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
BE93116 1970-08-24
BE94290 1970-09-23
BE100618 1971-03-08
BE102057 1971-04-09
BE104488 1971-06-11

Publications (1)

Publication Number Publication Date
GB1374247A true GB1374247A (en) 1974-11-20

Family

ID=27507527

Family Applications (5)

Application Number Title Priority Date Filing Date
GB2016474A Expired GB1374248A (en) 1970-08-24 1971-08-24 Control systems
GB1991974A Expired GB1374246A (en) 1970-08-24 1971-08-24 Electric switch
GB2016374A Expired GB1374247A (en) 1970-08-24 1971-08-24
GB3970471A Expired GB1374245A (en) 1970-08-24 1971-08-24 Electronic photoflash
GB2022174A Expired GB1374249A (en) 1970-08-24 1971-08-24 Electronic photoflash

Family Applications Before (2)

Application Number Title Priority Date Filing Date
GB2016474A Expired GB1374248A (en) 1970-08-24 1971-08-24 Control systems
GB1991974A Expired GB1374246A (en) 1970-08-24 1971-08-24 Electric switch

Family Applications After (2)

Application Number Title Priority Date Filing Date
GB3970471A Expired GB1374245A (en) 1970-08-24 1971-08-24 Electronic photoflash
GB2022174A Expired GB1374249A (en) 1970-08-24 1971-08-24 Electronic photoflash

Country Status (3)

Country Link
JP (11) JPS524933B1 (en)
DE (5) DE2166612B2 (en)
GB (5) GB1374248A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2134662A (en) * 1983-01-24 1984-08-15 Eastman Kodak Co Electronic flash apparatus
US4540265A (en) * 1983-01-24 1985-09-10 Eastman Kodak Company Energy-saving electronic flash apparatus

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2738984A1 (en) * 1977-08-30 1979-03-15 Rollei Werke Franke Heidecke ELECTRONIC FLASH DEVICE FOR PHOTOGRAPHIC RECORDING PURPOSES
JPS55134823A (en) * 1979-04-06 1980-10-21 Olympus Optical Co Ltd Strobe light emission control system
JPS63170484U (en) * 1987-04-23 1988-11-07
EP1083458A3 (en) * 1999-09-07 2005-07-27 Konica Corporation Lens-fitted film unit with strobe circuit

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1966984A1 (en) * 1968-02-13 1976-03-25 Ponder & Best ELECTRONIC FLASH DEVICE WITH EXTERNAL FLASH BLOCK
US3519879A (en) * 1968-07-25 1970-07-07 Honeywell Inc Flash apparatus with automatic light termination having gating and anticipation means
JPS5038616Y2 (en) * 1971-09-01 1975-11-07
JPS5149410A (en) * 1974-10-25 1976-04-28 Hitachi Ltd TATEJIKUGATADENDOKI

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2134662A (en) * 1983-01-24 1984-08-15 Eastman Kodak Co Electronic flash apparatus
US4540265A (en) * 1983-01-24 1985-09-10 Eastman Kodak Company Energy-saving electronic flash apparatus

Also Published As

Publication number Publication date
JPS54102119U (en) 1979-07-18
GB1374249A (en) 1974-11-20
JPS524933B1 (en) 1977-02-08
JPS50112030A (en) 1975-09-03
DE2166613B2 (en) 1975-10-30
JPS50112028A (en) 1975-09-03
JPS50112026A (en) 1975-09-03
JPS50111566A (en) 1975-09-02
JPS5427140B2 (en) 1979-09-07
DE2142081A1 (en) 1972-04-13
GB1374245A (en) 1974-11-20
DE2166611A1 (en) 1975-05-07
DE2166611B2 (en) 1978-05-18
DE2142081B2 (en) 1976-02-12
JPS50112029A (en) 1975-09-03
JPS50112027A (en) 1975-09-03
GB1374248A (en) 1974-11-20
JPS629890B2 (en) 1987-03-03
DE2166610A1 (en) 1974-11-14
JPS5410099B2 (en) 1979-05-01
GB1374246A (en) 1974-11-20
JPS50112025A (en) 1975-09-03
JPS50112032A (en) 1975-09-03
JPS544849B2 (en) 1979-03-10
DE2166612A1 (en) 1975-05-07
DE2166612B2 (en) 1975-12-04
JPS50112031A (en) 1975-09-03
DE2166613A1 (en) 1975-05-07

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee