JPS57190935A - Flash starting device of flash discharge flashgun having response to optical pulse - Google Patents

Flash starting device of flash discharge flashgun having response to optical pulse

Info

Publication number
JPS57190935A
JPS57190935A JP56074991A JP7499181A JPS57190935A JP S57190935 A JPS57190935 A JP S57190935A JP 56074991 A JP56074991 A JP 56074991A JP 7499181 A JP7499181 A JP 7499181A JP S57190935 A JPS57190935 A JP S57190935A
Authority
JP
Japan
Prior art keywords
turned
flash
transistors
light
optical pulse
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
JP56074991A
Other languages
Japanese (ja)
Inventor
Motoharu Aikawa
Shuichi Mihara
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.)
SUN PACK KK
Sun Pack Co Ltd
Sunpak KK
Original Assignee
SUN PACK KK
Sun Pack Co Ltd
Sunpak KK
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 SUN PACK KK, Sun Pack Co Ltd, Sunpak KK filed Critical SUN PACK KK
Priority to JP56074991A priority Critical patent/JPS57190935A/en
Publication of JPS57190935A publication Critical patent/JPS57190935A/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
    • 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
    • G03B2215/0514—Separate unit
    • G03B2215/0557—Multiple units, e.g. slave-unit

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Stroboscope Apparatuses (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)

Abstract

PURPOSE:To eliminate an independent installation of a photoelectric transducer for start of the flash, by providing an automatic switch circuit which switches and connects the photoelectric transducer to an integrator from a voltage generating member for start of a trigger circuit. CONSTITUTION:When a phototransistor 35 receives the optical pulse in the slave flash mode, the pulse voltage is produced at a coil 46. Thus an SCR11 conducts and an inner light discharge tube 6 has the emission of light. As a result, the voltage of a light measuring circuit is generated between the terminals of a Zener diode 33. Then transistors 48, 43 and 44 are turned on and off respectively, and as a result a transistor 45 is turned off to prevent the inflow of the photoelectric converting current to the coil 46. On the other hand, the transistors 37 and 40 are turned on and off respectively, and an integral capacitor 36 is charged by the photoelectric converting current. When the integral value reaches a prescribed level, the transistors 38 and 39 are turned on. Thus an SCR18 conducts to perform the commutation, and the emission of light is discontinued.
JP56074991A 1981-05-20 1981-05-20 Flash starting device of flash discharge flashgun having response to optical pulse Pending JPS57190935A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56074991A JPS57190935A (en) 1981-05-20 1981-05-20 Flash starting device of flash discharge flashgun having response to optical pulse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56074991A JPS57190935A (en) 1981-05-20 1981-05-20 Flash starting device of flash discharge flashgun having response to optical pulse

Publications (1)

Publication Number Publication Date
JPS57190935A true JPS57190935A (en) 1982-11-24

Family

ID=13563249

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56074991A Pending JPS57190935A (en) 1981-05-20 1981-05-20 Flash starting device of flash discharge flashgun having response to optical pulse

Country Status (1)

Country Link
JP (1) JPS57190935A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52154281A (en) * 1976-06-15 1977-12-21 West Electric Co Electronic flash device
JPS564132A (en) * 1979-06-22 1981-01-17 Yoshiyuki Takematsu Flash device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52154281A (en) * 1976-06-15 1977-12-21 West Electric Co Electronic flash device
JPS564132A (en) * 1979-06-22 1981-01-17 Yoshiyuki Takematsu Flash device

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