JPS5713437A - Flash discharge light emitting device responding to luminosity of field - Google Patents

Flash discharge light emitting device responding to luminosity of field

Info

Publication number
JPS5713437A
JPS5713437A JP8595380A JP8595380A JPS5713437A JP S5713437 A JPS5713437 A JP S5713437A JP 8595380 A JP8595380 A JP 8595380A JP 8595380 A JP8595380 A JP 8595380A JP S5713437 A JPS5713437 A JP S5713437A
Authority
JP
Japan
Prior art keywords
luminosity
field
discharge tube
prescribed value
flash discharge
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.)
Pending
Application number
JP8595380A
Other languages
Japanese (ja)
Inventor
Yoshiyuki Takematsu
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.)
Fuji Koeki Corp
Original Assignee
Fuji Koeki Corp
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 Fuji Koeki Corp filed Critical Fuji Koeki Corp
Priority to JP8595380A priority Critical patent/JPS5713437A/en
Priority to DE19813123101 priority patent/DE3123101A1/en
Priority to US06/276,510 priority patent/US4394079A/en
Priority to GB8119481A priority patent/GB2078985B/en
Publication of JPS5713437A publication Critical patent/JPS5713437A/en
Pending 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
    • 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
    • G03B2215/0503—Built-in units
    • G03B2215/0507—Pop-up mechanisms

Landscapes

  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
  • Stroboscope Apparatuses (AREA)

Abstract

PURPOSE:To prevent overexposure automatically by stopping the oscillations of the DC-DC converter of a charging source for a main capacitor on detecting the luminosity of a field exceeding a prescribed value. CONSTITUTION:When the luminosity of a field exceeds a prescribed value, the resistance of a photoconductive element 7 increases to turn off a transistor 3, so that an oscillation transformer 2 forming a DC-DC converter will not oscillate. Therefore, a main capacitor 12 is not charged, and a flash discharge tube 18 never flashes. On the other hand, if the luminosity of the field exceeds the prescribed value while the discharge tube 18 is flashing to stop the oscillations of the transformer 2, capacitors 11 and 14 are discharged via a resistance 17 to turn off a neon lamp 9. Simultaneously, a trigger voltage obtained through a boosting transformer 15 is vanished to stop the flashing of the discharge tube 18, thus preventing over-exposure automatically.
JP8595380A 1980-06-26 1980-06-26 Flash discharge light emitting device responding to luminosity of field Pending JPS5713437A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP8595380A JPS5713437A (en) 1980-06-26 1980-06-26 Flash discharge light emitting device responding to luminosity of field
DE19813123101 DE3123101A1 (en) 1980-06-26 1981-06-11 "PHOTOGRAPHIC FLASH LIGHTING DEVICE"
US06/276,510 US4394079A (en) 1980-06-26 1981-06-23 Photographic flash device operatively responsive to the luminance of an object to be photographed to prevent overexposure
GB8119481A GB2078985B (en) 1980-06-26 1981-06-24 Photographic flash device operatively responsive to luminance of object to be photographed

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8595380A JPS5713437A (en) 1980-06-26 1980-06-26 Flash discharge light emitting device responding to luminosity of field

Publications (1)

Publication Number Publication Date
JPS5713437A true JPS5713437A (en) 1982-01-23

Family

ID=13873112

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8595380A Pending JPS5713437A (en) 1980-06-26 1980-06-26 Flash discharge light emitting device responding to luminosity of field

Country Status (1)

Country Link
JP (1) JPS5713437A (en)

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