JPS55153928A - Automatic light quantity controlling flash light emitting device - Google Patents
Automatic light quantity controlling flash light emitting deviceInfo
- Publication number
- JPS55153928A JPS55153928A JP1245876A JP1245876A JPS55153928A JP S55153928 A JPS55153928 A JP S55153928A JP 1245876 A JP1245876 A JP 1245876A JP 1245876 A JP1245876 A JP 1245876A JP S55153928 A JPS55153928 A JP S55153928A
- Authority
- JP
- Japan
- Prior art keywords
- light
- xenon lamp
- emitting device
- voltage
- control element
- 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
Abstract
PURPOSE:To control the quantity of emitted light by charging a capacitor through the photoelectric element which actuates by receiving the reflected light from the subject at the same instant of light emission of an internal light emitting device and controlling the light quantity control element when its voltage reaches the specified voltage thereby cutting off or putting out the light source. CONSTITUTION:When a trigger switch TS is closed, a xenon lamp Xe goes on and a switch SW closes at the same time. When the reflected light from the subject enters a photoconductor PC such as CdS, its resistance decreases and a capacitor SC is charged by an electric power source E. When its voltage reaches the preset value, a relay discharge tube RD discharges and the voltage having been applied to a light quantity control element LC' using, for example, glass panel, becomes zero and therefore the element becomes nontransparent to cut off the light of the xenon lamp. It is also possible to control the quantity of light by shorting and putting out the xenon lamp Xe by making use of a light quantity control element LC' such as thyristor.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1245876A JPS55153928A (en) | 1976-02-07 | 1976-02-07 | Automatic light quantity controlling flash light emitting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1245876A JPS55153928A (en) | 1976-02-07 | 1976-02-07 | Automatic light quantity controlling flash light emitting device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55153928A true JPS55153928A (en) | 1980-12-01 |
Family
ID=11805892
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1245876A Pending JPS55153928A (en) | 1976-02-07 | 1976-02-07 | Automatic light quantity controlling flash light emitting device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55153928A (en) |
-
1976
- 1976-02-07 JP JP1245876A patent/JPS55153928A/en active Pending
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