JPS5785039A - Automatic dimming electronic flash device - Google Patents

Automatic dimming electronic flash device

Info

Publication number
JPS5785039A
JPS5785039A JP55162404A JP16240480A JPS5785039A JP S5785039 A JPS5785039 A JP S5785039A JP 55162404 A JP55162404 A JP 55162404A JP 16240480 A JP16240480 A JP 16240480A JP S5785039 A JPS5785039 A JP S5785039A
Authority
JP
Japan
Prior art keywords
terminal
flash device
automatic dimming
exclusive
light
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
JP55162404A
Other languages
Japanese (ja)
Inventor
Katsumi Horinishi
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.)
WEST DENKI KK
West Electric Co Ltd
Original Assignee
WEST DENKI KK
West Electric Co Ltd
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 WEST DENKI KK, West Electric Co Ltd filed Critical WEST DENKI KK
Priority to JP55162404A priority Critical patent/JPS5785039A/en
Publication of JPS5785039A publication Critical patent/JPS5785039A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • 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)

Abstract

PURPOSE:To permit the use of a titled device also as an ordinary automatic dimming flash device other than the exclusive use by so constituting the same that a control circuit for quantity of light operates in spite of an open or short circuit state of a terminal to be supplied with electric signals. CONSTITUTION:For example, if a terminal A is open without using an exclusive camera, the output of an operational amplifier 19 goes zero, and a voltage comparator 15 emits an output signal of a high level. The voltage obtained by dividing a high level output signal with resistances 13, 14 is supplied to the inversion input terminal of another voltage comparator 10. Therefore, when the terminal voltage of an integrating capacitor 11 attains the voltage value divided by the resistances 13, 14 on account of the photocurrent flowing through a photosensor 9, the light emission operation of a flash discharge tube 6 is controlled by a light quantity control part 7. With such constitution, a control circuit for quantity of light is operatable, although the terminal A is open. Hence, this is usable both as an exclusive automatic dimming flash device and as an ordinary automatic dimming flash device other than for the exclusive use.
JP55162404A 1980-11-17 1980-11-17 Automatic dimming electronic flash device Pending JPS5785039A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55162404A JPS5785039A (en) 1980-11-17 1980-11-17 Automatic dimming electronic flash device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55162404A JPS5785039A (en) 1980-11-17 1980-11-17 Automatic dimming electronic flash device

Publications (1)

Publication Number Publication Date
JPS5785039A true JPS5785039A (en) 1982-05-27

Family

ID=15753956

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55162404A Pending JPS5785039A (en) 1980-11-17 1980-11-17 Automatic dimming electronic flash device

Country Status (1)

Country Link
JP (1) JPS5785039A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100450085B1 (en) * 2002-08-16 2004-09-30 삼성테크윈 주식회사 Flash control apparatus utilizing characteristic of logarithmic function

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100450085B1 (en) * 2002-08-16 2004-09-30 삼성테크윈 주식회사 Flash control apparatus utilizing characteristic of logarithmic function

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