ES390865A1 - Electronic flashlight units - Google Patents

Electronic flashlight units

Info

Publication number
ES390865A1
ES390865A1 ES390865A ES390865A ES390865A1 ES 390865 A1 ES390865 A1 ES 390865A1 ES 390865 A ES390865 A ES 390865A ES 390865 A ES390865 A ES 390865A ES 390865 A1 ES390865 A1 ES 390865A1
Authority
ES
Spain
Prior art keywords
rectifier
polarity
voltage
flash
capacitor
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
ES390865A
Other languages
Spanish (es)
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.)
MULTIBLITZ DR ING D A MANNSESM
Original Assignee
MULTIBLITZ DR ING D A MANNSESM
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
Priority claimed from DE19702021880 external-priority patent/DE2021880A1/en
Priority claimed from DE19702038859 external-priority patent/DE2038859A1/en
Application filed by MULTIBLITZ DR ING D A MANNSESM filed Critical MULTIBLITZ DR ING D A MANNSESM
Publication of ES390865A1 publication Critical patent/ES390865A1/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)
  • Rectifiers (AREA)
  • Stroboscope Apparatuses (AREA)

Abstract

In an electronic flashlight unit, a controlled semiconductor rectifier is ignited simultaneously with the ignition of flash tube and power from a first capacitor flows therethrough. A voltage of one polarity thereby appears across the rectifier. The discharge causes a voltage drop across a resistor and that voltage drop is used to charge an integrating capacitor in correspondence with the integral of the flash light flux as detected by a photoresistor. At a predetermined integral value a switching action applies the voltage of a quenching capacitor across the rectifier in a manner such that the polarity is opposite to said one polarity. The rectifier is thereby turned off to ensure that the flash tube is quenched. In one embodiment two semiconductor rectifiers each connected in series to a reactor are provided in the flash discharge circuit and a second pair similarly connected in the quenching circuit to enable the use of inexpensive low-power semiconductor rectifiers protected from overloading.
ES390865A 1970-05-05 1971-05-04 Electronic flashlight units Expired ES390865A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19702021880 DE2021880A1 (en) 1970-05-05 1970-05-05 Electronic flash unit
DE19702038859 DE2038859A1 (en) 1970-08-05 1970-08-05 Electronic flash unit

Publications (1)

Publication Number Publication Date
ES390865A1 true ES390865A1 (en) 1973-07-01

Family

ID=25759082

Family Applications (1)

Application Number Title Priority Date Filing Date
ES390865A Expired ES390865A1 (en) 1970-05-05 1971-05-04 Electronic flashlight units

Country Status (8)

Country Link
US (1) US3808500A (en)
AT (1) AT316307B (en)
CA (1) CA921549A (en)
CH (1) CH522894A (en)
ES (1) ES390865A1 (en)
FR (1) FR2093492A5 (en)
GB (1) GB1331328A (en)
NL (1) NL7106106A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2305782A1 (en) * 1973-02-07 1974-08-08 Rollei Werke Franke Heidecke ELECTRONIC FLASH UNIT FOR PHOTOGRAPHIC PURPOSES
US3976914A (en) * 1975-05-27 1976-08-24 Honeywell Inc. Series SCR gate hold-on circuit
JPS5421070A (en) * 1977-07-18 1979-02-16 West Electric Co Electronic flashing device

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3229158A (en) * 1962-02-21 1966-01-11 Honeywell Inc Electronic photographic flash apparatus with photosensitive capacitor charge monitoring
US3344311A (en) * 1965-05-24 1967-09-26 Gen Electric Compensating control circuit
US3344310A (en) * 1966-01-13 1967-09-26 Gen Electric Universal lamp control circuit with high voltage producing means
US3591829A (en) * 1967-04-20 1971-07-06 Minolta Camera Kk Automatic control device for electronic flash
US3510750A (en) * 1967-11-28 1970-05-05 Masao Horino Rectified output voltage control device
DE1814856A1 (en) * 1968-12-11 1970-07-16 Loewe Opta Gmbh Electronic flash unit with a device for regulating the duration of the flash
DE1905223A1 (en) * 1969-01-28 1970-08-13 Loewe Opta Gmbh Electronic flash unit with flash duration control device

Also Published As

Publication number Publication date
GB1331328A (en) 1973-09-26
CA921549A (en) 1973-02-20
AT316307B (en) 1974-07-10
CH522894A (en) 1972-05-15
NL7106106A (en) 1971-11-09
US3808500A (en) 1974-04-30
FR2093492A5 (en) 1972-01-28

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