JPS5640814A - Electronic flash device - Google Patents
Electronic flash deviceInfo
- 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
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.
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)
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 photographing |
JPS5855917A (en) * | 1981-09-29 | 1983-04-02 | Nippon Kogaku Kk <Nikon> | Flash emitting device which can emit flash continuously |
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)
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 |
-
1979
- 1979-09-11 JP JP11711979A patent/JPS5640814A/en active Pending
Patent Citations (2)
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 (12)
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 photographing |
JPH0522891B2 (en) * | 1981-07-31 | 1993-03-31 | Nippon Kogaku Kk | |
JPS5855917A (en) * | 1981-09-29 | 1983-04-02 | Nippon Kogaku Kk <Nikon> | Flash emitting device which can emit flash continuously |
JPH0522894B2 (en) * | 1981-09-29 | 1993-03-31 | Nippon Kogaku Kk | |
JPS58150943A (en) * | 1982-03-03 | 1983-09-07 | Minolta Camera Co Ltd | Detecting device of charging completion of electronic flash device |
JPH0462057B2 (en) * | 1982-03-03 | 1992-10-05 | Minolta Camera Kk | |
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 |
JPH0467515B2 (en) * | 1985-10-14 | 1992-10-28 | Shinetsu Chem Ind Co | |
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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