JPS5788437A - Dimming system electronic flash device - Google Patents

Dimming system electronic flash device

Info

Publication number
JPS5788437A
JPS5788437A JP55164243A JP16424380A JPS5788437A JP S5788437 A JPS5788437 A JP S5788437A JP 55164243 A JP55164243 A JP 55164243A JP 16424380 A JP16424380 A JP 16424380A JP S5788437 A JPS5788437 A JP S5788437A
Authority
JP
Japan
Prior art keywords
started
light emission
electronic flash
flash device
voltage
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
JP55164243A
Other languages
Japanese (ja)
Inventor
Kaoru Kuraishi
Norio Takada
Akio Takeshita
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.)
Toshiba Corp
Original Assignee
Toshiba 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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP55164243A priority Critical patent/JPS5788437A/en
Publication of JPS5788437A publication Critical patent/JPS5788437A/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)

Abstract

PURPOSE:To prevent an overexposure, by constituting a titled device so that light emission is started by delaying by a prescribed time from a light emission start time of a main electronic flash device, and also its dimming operation is started simultaneously when light emission of the main electronic flash device is started. CONSTITUTION:When a shutter of a camera is pushed, and a main electronic flash device emits light, this light is photodetected by a photothyristor 27 functioning as a synchronizing light emission photodetecting element, by which voltage is generated across a resistance 30. This voltage is an output of a photodetecting means, and on the one hand, this voltage is supplied to a dimming circuit 26 as a dimming operation start signal, and starts an integrating operation of the integration circuit in the dimming circuit 26. On the other hand, voltage generated across the resistance 30 is supplied to a delaying circuit 34, too, consisting of a resistance 32 and a capacitor 33 through a reverse-current preventive diode 31, by which the delaying circuit 34 generates voltage across a resistance 35 in a prescribed time after the photothyristor 27 has been started, and starts a thyristor 15. That is to say, a flash discharge tube 13 starts to emit light after a delay time of the delaying circuit 34 after light emission of the main electronic flash device 2 has been started.
JP55164243A 1980-11-21 1980-11-21 Dimming system electronic flash device Pending JPS5788437A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55164243A JPS5788437A (en) 1980-11-21 1980-11-21 Dimming system electronic flash device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55164243A JPS5788437A (en) 1980-11-21 1980-11-21 Dimming system electronic flash device

Publications (1)

Publication Number Publication Date
JPS5788437A true JPS5788437A (en) 1982-06-02

Family

ID=15789389

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55164243A Pending JPS5788437A (en) 1980-11-21 1980-11-21 Dimming system electronic flash device

Country Status (1)

Country Link
JP (1) JPS5788437A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63180837U (en) * 1987-05-15 1988-11-22
JPS63194330U (en) * 1987-06-03 1988-12-14
US6798986B2 (en) 2002-02-15 2004-09-28 Nikon Corporation Slave flash controlling device and slave flash device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS564132A (en) * 1979-06-22 1981-01-17 Yoshiyuki Takematsu Flash device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS564132A (en) * 1979-06-22 1981-01-17 Yoshiyuki Takematsu Flash device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63180837U (en) * 1987-05-15 1988-11-22
JPH0438336Y2 (en) * 1987-05-15 1992-09-08
JPS63194330U (en) * 1987-06-03 1988-12-14
US6798986B2 (en) 2002-02-15 2004-09-28 Nikon Corporation Slave flash controlling device and slave flash device

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