JPS5640814A - Electronic flash device - Google Patents

Electronic flash device

Info

Publication number
JPS5640814A
JPS5640814A JP11711979A JP11711979A JPS5640814A JP S5640814 A JPS5640814 A JP S5640814A JP 11711979 A JP11711979 A JP 11711979A JP 11711979 A JP11711979 A JP 11711979A JP S5640814 A JPS5640814 A JP S5640814A
Authority
JP
Japan
Prior art keywords
flash
light emitted
capacitor
emission
time
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
JP11711979A
Other languages
Japanese (ja)
Inventor
Mikio Naya
Yoshiharu Ota
Hiroshi Hosomizu
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.)
Minolta Co Ltd
Original Assignee
Minolta 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 Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP11711979A priority Critical patent/JPS5640814A/en
Publication of JPS5640814A publication Critical patent/JPS5640814A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE:To achieve the reduction in the charging time of a main capacitor and make possible continuous flash photographing with a motor drive by selecting time constant resistances to control the timing for discharge stop thereby decreasing the quantity of the light emitted. CONSTITUTION:If the guide number of a flash device is changed over by way of a switch, the corresponding resistances 38-40 are selected by a switch 48 cooperating therewith and their time constants determined together with a capacitor 37 change. As a result, the time when the emission stop control current through a thyristor 20 owing to discharging of a capacitor 34 via a transistor 35 conducting upon emission of a flash tube 19 reaches predetermined current value is controlled, and the quantity of the light emitted by the discharge tube 19 becomes less. This results in the decreased charging time of the main capacitor 5 after the emission of flash and the stabilized quantity of the light emitted at less and constant quantity, thus the continuous flash photographing through motor drive controlling may be performed.
JP11711979A 1979-09-11 1979-09-11 Electronic flash device Pending JPS5640814A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11711979A JPS5640814A (en) 1979-09-11 1979-09-11 Electronic flash device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11711979A JPS5640814A (en) 1979-09-11 1979-09-11 Electronic flash device

Publications (1)

Publication Number Publication Date
JPS5640814A true JPS5640814A (en) 1981-04-17

Family

ID=14703890

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11711979A Pending JPS5640814A (en) 1979-09-11 1979-09-11 Electronic flash device

Country Status (1)

Country Link
JP (1) JPS5640814A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5821722A (en) * 1981-07-31 1983-02-08 Nippon Kogaku Kk <Nikon> Display device for flash photographing
JPS5821721A (en) * 1981-07-31 1983-02-08 Nippon Kogaku Kk <Nikon> Display device for flash photography
JPS5855917A (en) * 1981-09-29 1983-04-02 Nippon Kogaku Kk <Nikon> Flash device that can emit continuous flash light
JPS58150943A (en) * 1982-03-03 1983-09-07 Minolta Camera Co Ltd Detecting device of charging completion of electronic flash device
JPS6117137A (en) * 1984-07-04 1986-01-25 Agency Of Ind Science & Technol Photosensitive emulsion for application to plastic film
JPS6287394A (en) * 1985-10-14 1987-04-21 Shin Etsu Chem Co Ltd Mesh composite material for screen printing
EP0373537A1 (en) 1988-12-14 1990-06-20 THE STATE OF JAPAN, as Represented by the DIRECTOR GENERAL of the AGENCY of INDUSTRIAL SCIENCE and TECHNOLOGY Photosensitive poly(vinyl alcohol) derivative
FR2722892A1 (en) * 1994-07-22 1996-01-26 Samsung Aerospace Ind PHOTOGRAPHIC APPARATUS FOR REDUCING THE CHARGING TIME OF A FLASH

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5123623A (en) * 1974-08-20 1976-02-25 West Electric Co JIDODENSHISENKOSOCHI
JPS5474420A (en) * 1977-11-25 1979-06-14 Fuji Photo Optical Co Ltd Strobo flash preventing circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5123623A (en) * 1974-08-20 1976-02-25 West Electric Co JIDODENSHISENKOSOCHI
JPS5474420A (en) * 1977-11-25 1979-06-14 Fuji Photo Optical Co Ltd Strobo flash preventing circuit

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5821722A (en) * 1981-07-31 1983-02-08 Nippon Kogaku Kk <Nikon> Display device for flash photographing
JPS5821721A (en) * 1981-07-31 1983-02-08 Nippon Kogaku Kk <Nikon> Display device for flash photography
JPS5855917A (en) * 1981-09-29 1983-04-02 Nippon Kogaku Kk <Nikon> Flash device that can emit continuous flash light
JPS58150943A (en) * 1982-03-03 1983-09-07 Minolta Camera Co Ltd Detecting device of charging completion of electronic flash device
JPS6117137A (en) * 1984-07-04 1986-01-25 Agency Of Ind Science & Technol Photosensitive emulsion for application to plastic film
JPS6287394A (en) * 1985-10-14 1987-04-21 Shin Etsu Chem Co Ltd Mesh composite material for screen printing
EP0373537A1 (en) 1988-12-14 1990-06-20 THE STATE OF JAPAN, as Represented by the DIRECTOR GENERAL of the AGENCY of INDUSTRIAL SCIENCE and TECHNOLOGY Photosensitive poly(vinyl alcohol) derivative
FR2722892A1 (en) * 1994-07-22 1996-01-26 Samsung Aerospace Ind PHOTOGRAPHIC APPARATUS FOR REDUCING THE CHARGING TIME OF A FLASH

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