GB1374245A - Electronic photoflash - Google Patents

Electronic photoflash

Info

Publication number
GB1374245A
GB1374245A GB3970471A GB3970471A GB1374245A GB 1374245 A GB1374245 A GB 1374245A GB 3970471 A GB3970471 A GB 3970471A GB 3970471 A GB3970471 A GB 3970471A GB 1374245 A GB1374245 A GB 1374245A
Authority
GB
United Kingdom
Prior art keywords
tube
capacitor
thyristor
flash
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
GB3970471A
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 GB1374245A publication Critical patent/GB1374245A/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

Abstract

1374245 Photo-flash control circuit PONDER & BEST Inc 24 Aug 1971 [24 Aug 1970 23 Sept 1970 8 March 1971 9 April 1971 11 June 1971] 39704/71 Heading G2A A flash limiting circuit is arranged to terminate discharge through a flash-tube 3 without wasting the charge still remaining on the storage capacitor 1. In Fig. 1, a capacitor turn off circuit 8, 10 is connected in parallel with tube 3 and a thyristor 6, closing a camera synch, contact 301 turns on thyristor 6 to discharge capacitor 1 through tube 3. A photo-electrically controlled integrating circuit 203, 204 turns on a thryristor 10 whereby a reverse current flows through and blocks thyristor 6 to deionize the tube. Fig. 2 (not shown), includes an additional capacitor (19) to accelerate the blocking of the thyristor 6. Fig. 2 also includes a "flash ready" indicator lamp (14). In Fig. 8 a parallel switch 85 is closed to short out tube 3 and the resulting current surge from capacitor 1 sets up magnetic fields in coil springs 86 sufficient to separate contacts 87 of a series switch 82'for a time sufficient for tube 3 to deionize. Fig. 9 (not shown) shows an alternative series switch in which a capacitor (93) discharges through a relay coil to hold the relay contact (91) open whilst the tube deionizes.
GB3970471A 1970-08-24 1971-08-24 Electronic photoflash Expired GB1374245A (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
GB1374245A true GB1374245A (en) 1974-11-20

Family

ID=27507527

Family Applications (5)

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

Family Applications Before (4)

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

Country Status (3)

Country Link
JP (11) JPS524933B1 (en)
DE (5) DE2166613B2 (en)
GB (5) GB1374249A (en)

Cited By (3)

* 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
EP1083458A2 (en) * 1999-09-07 2001-03-14 Konica Corporation Lens-fitted film unit with strobe circuit

Families Citing this family (3)

* 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

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1907059B2 (en) * 1968-02-13 1973-04-19 Lumina SPRL, Brüssel ELECTRON FLASH DEVICE
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 (4)

* 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
EP1083458A2 (en) * 1999-09-07 2001-03-14 Konica Corporation Lens-fitted film unit with strobe circuit
EP1083458A3 (en) * 1999-09-07 2005-07-27 Konica Corporation Lens-fitted film unit with strobe circuit

Also Published As

Publication number Publication date
JPS54102119U (en) 1979-07-18
DE2166613B2 (en) 1975-10-30
DE2142081A1 (en) 1972-04-13
JPS5427140B2 (en) 1979-09-07
JPS50112025A (en) 1975-09-03
JPS524933B1 (en) 1977-02-08
GB1374248A (en) 1974-11-20
GB1374246A (en) 1974-11-20
JPS50111566A (en) 1975-09-02
DE2166612A1 (en) 1975-05-07
GB1374249A (en) 1974-11-20
DE2166611B2 (en) 1978-05-18
JPS50112030A (en) 1975-09-03
DE2166612B2 (en) 1975-12-04
JPS5410099B2 (en) 1979-05-01
GB1374247A (en) 1974-11-20
JPS50112032A (en) 1975-09-03
JPS629890B2 (en) 1987-03-03
JPS544849B2 (en) 1979-03-10
JPS50112026A (en) 1975-09-03
JPS50112029A (en) 1975-09-03
JPS50112028A (en) 1975-09-03
JPS50112027A (en) 1975-09-03
DE2142081B2 (en) 1976-02-12
JPS50112031A (en) 1975-09-03
DE2166613A1 (en) 1975-05-07
DE2166610A1 (en) 1974-11-14
DE2166611A1 (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