JPS552267A - Driving system of electromagnetically driven shutter - Google Patents
Driving system of electromagnetically driven shutterInfo
- Publication number
- JPS552267A JPS552267A JP7513778A JP7513778A JPS552267A JP S552267 A JPS552267 A JP S552267A JP 7513778 A JP7513778 A JP 7513778A JP 7513778 A JP7513778 A JP 7513778A JP S552267 A JPS552267 A JP S552267A
- Authority
- JP
- Japan
- Prior art keywords
- subject luminance
- coil
- constant voltage
- shutter
- capacitors
- 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.)
- Granted
Links
Landscapes
- Exposure Control For Cameras (AREA)
- Shutters For Cameras (AREA)
Abstract
PURPOSE: To enable large current to be supplied from a capacitor to the coil of a motor only when high speed second time is required by discriminating the subject luminance level and changing over the first and second power source device outputs.
CONSTITUTION: When a switch MSW is closed in an electromagnetically driven shutter device which is electromagnetically opened and close by an electromagnetic driving device, a constant voltage is generated from a constant voltage circuit 31 and the voltage corresponding to the subject luminance is generated in the output of an operational amplifier OP 1. When the subject luminance is high, a switching transistor TR 1 goes ON to supply power from a battery 30 to a DC boosting circuit 39, by which capacitors C1, C2 are charged. When the shutter is released in the state where this charging is completed, the charge amounts from the capacitors C1, C2 flow in the coil 9 of the electromagnetic driving device, whereby, the shutter opening and closing operations are accomplished. When the subject luminance is low, the operation level of the operational amplifier OP 1 does not rise and the boosting circuit 39 does not operate, thus the low voltage is supplied to the coil 9 from the constant voltage circuit 31.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7513778A JPS552267A (en) | 1978-06-21 | 1978-06-21 | Driving system of electromagnetically driven shutter |
US06/048,742 US4264162A (en) | 1978-06-21 | 1979-06-15 | Drive system for electromagnetically driven shutter |
DE19792924876 DE2924876A1 (en) | 1978-06-21 | 1979-06-20 | DRIVE SYSTEM FOR AN ELECTROMAGNETICALLY OPERATED LOCKING |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7513778A JPS552267A (en) | 1978-06-21 | 1978-06-21 | Driving system of electromagnetically driven shutter |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS552267A true JPS552267A (en) | 1980-01-09 |
JPS6239403B2 JPS6239403B2 (en) | 1987-08-22 |
Family
ID=13567494
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7513778A Granted JPS552267A (en) | 1978-06-21 | 1978-06-21 | Driving system of electromagnetically driven shutter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS552267A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61148436A (en) * | 1984-12-21 | 1986-07-07 | Nippon Kogaku Kk <Nikon> | Shutter device capable of correcting run characteristic |
-
1978
- 1978-06-21 JP JP7513778A patent/JPS552267A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61148436A (en) * | 1984-12-21 | 1986-07-07 | Nippon Kogaku Kk <Nikon> | Shutter device capable of correcting run characteristic |
Also Published As
Publication number | Publication date |
---|---|
JPS6239403B2 (en) | 1987-08-22 |
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