JPS556369A - Electromagnet driving circuit - Google Patents
Electromagnet driving circuitInfo
- Publication number
- JPS556369A JPS556369A JP7903278A JP7903278A JPS556369A JP S556369 A JPS556369 A JP S556369A JP 7903278 A JP7903278 A JP 7903278A JP 7903278 A JP7903278 A JP 7903278A JP S556369 A JPS556369 A JP S556369A
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- electromagnetic coil
- transistor
- power source
- constant 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
Links
Landscapes
- Shutter-Related Mechanisms (AREA)
Abstract
PURPOSE: To let stable operation be accomplished without producing any fluctuation in detaching time in the electromagnetic device by controlling the charging voltage of a power supply capacitor which supplies electric energy to an electromagnetic coil with a constant voltage circuit and supplying always constant quantity of electricity to the electromagnetic coil.
CONSTITUTION: An electromagnetic coil 16 for the electric shutter of the camera is coiled to the core 20 provided with a permanent magnet 18 in a par thereof. When it is energized by the transistor 14 which controls power supply according to the output of a switching circuit 10, it offsets the magnetic force of the permanent magnet 18, causing an attraction piece 22 to be detached by a spring 24 thereby starting shutter close through a lever 26. The power supply capacitor 28 supplying electric energy to the electromagnetic coil 16 is held always connected to a power source 2 through a resistance 30 and is constantly kept charged with the specified charges. A constant voltage diode 32 and transistor 34 are connected across the power supply capacitor 28 and the base of the transistor 34 is connected to the power source battery 2 through a power source switch 8, whereby the constant voltage circuit CV is formed.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7903278A JPS556369A (en) | 1978-06-28 | 1978-06-28 | Electromagnet driving circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7903278A JPS556369A (en) | 1978-06-28 | 1978-06-28 | Electromagnet driving circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS556369A true JPS556369A (en) | 1980-01-17 |
Family
ID=13678580
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7903278A Pending JPS556369A (en) | 1978-06-28 | 1978-06-28 | Electromagnet driving circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS556369A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5880628A (en) * | 1981-11-09 | 1983-05-14 | Sharp Corp | Control circuit for releasing of shutter |
EP0317365A2 (en) * | 1987-11-20 | 1989-05-24 | Toto Ltd. | Solenoid valve control circuit |
-
1978
- 1978-06-28 JP JP7903278A patent/JPS556369A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5880628A (en) * | 1981-11-09 | 1983-05-14 | Sharp Corp | Control circuit for releasing of shutter |
EP0317365A2 (en) * | 1987-11-20 | 1989-05-24 | Toto Ltd. | Solenoid valve control circuit |
EP0715321A2 (en) * | 1987-11-20 | 1996-06-05 | Toto Ltd. | Solenoid valve control circuit |
EP0715321A3 (en) * | 1987-11-20 | 1996-06-26 | Toto Ltd |
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