GB892573A - Improvements in electronic flash apparatus and like apparatus - Google Patents

Improvements in electronic flash apparatus and like apparatus

Info

Publication number
GB892573A
GB892573A GB962759A GB962759A GB892573A GB 892573 A GB892573 A GB 892573A GB 962759 A GB962759 A GB 962759A GB 962759 A GB962759 A GB 962759A GB 892573 A GB892573 A GB 892573A
Authority
GB
United Kingdom
Prior art keywords
capacitor
oscillator
transistor
flash
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
GB962759A
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.)
TDK Micronas GmbH
Original Assignee
TDK Micronas GmbH
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 TDK Micronas GmbH filed Critical TDK Micronas GmbH
Publication of GB892573A publication Critical patent/GB892573A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/338—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/338—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement
    • H02M3/3385—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement with automatic control of output voltage or current
    • 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

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)

Abstract

892,573. Condenser charging arrangements for photo-flash arrangements. INTERMETALL GESELLSCHAFT FUR METALLURGIE UND ELEKTRONIK. March 19, 1959 [April 11, 1958], No. 9627/59. Class 38 (4). Photo-flash apparatus comprises a capacitor Cb which is charged from a direct current source Q by way of an oscillator including a transistor T 1 and a transformer W 1 , W 2 , W 3 , the arrangement being such that when the capacitor Cb becomes fully charged an indicator lamp A ignites whereupon a control transistor Ts becomes conductive to short circuit the base-emitter circuit of the oscillator transistor T 1 so disabling the oscillator. A fall in the charge of the capacitor Cb then causes the lamp A to extinguish whereby the oscillator once more starts oscillating to bring the charge on the capacitor Cb up to its full value. Closure of the camera shutter switch S energizes a trigger transformer T whereupon the capacitor Cb discharges into a gas-discharge tube B to produce a flash. A capacitor Ch charges up over a diode D 2 and assists the disablement of the oscillator by impressing on the base of the transistor T 1 a positive potential relative to the emitter. A battery may be connected in parallel with the capacitor Ch to obviate the effect of temperature on the transistor T 1 .
GB962759A 1958-04-11 1959-03-19 Improvements in electronic flash apparatus and like apparatus Expired GB892573A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEI14681A DE1124152B (en) 1958-04-11 1958-04-11 Circuit arrangement for keeping constant the nominal voltage of a charged flash capacitor in electronic flash units

Publications (1)

Publication Number Publication Date
GB892573A true GB892573A (en) 1962-03-28

Family

ID=7185683

Family Applications (1)

Application Number Title Priority Date Filing Date
GB962759A Expired GB892573A (en) 1958-04-11 1959-03-19 Improvements in electronic flash apparatus and like apparatus

Country Status (3)

Country Link
DE (1) DE1124152B (en)
FR (1) FR1219172A (en)
GB (1) GB892573A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1279819B (en) * 1963-06-28 1968-10-10 Siemens Ag Voltage regulated DC converter
DE1182744B (en) * 1964-01-31 1964-12-03 Metz App Werke Inh Paul Metz Electronic flash light device with voltage regulation

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL197375A (en) * 1954-05-20
NL201086A (en) * 1954-10-11
NL203732A (en) * 1955-01-18

Also Published As

Publication number Publication date
FR1219172A (en) 1960-05-16
DE1124152B (en) 1962-02-22

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