JPS55101924A - Electromagnetically driven shutter - Google Patents
Electromagnetically driven shutterInfo
- Publication number
- JPS55101924A JPS55101924A JP991079A JP991079A JPS55101924A JP S55101924 A JPS55101924 A JP S55101924A JP 991079 A JP991079 A JP 991079A JP 991079 A JP991079 A JP 991079A JP S55101924 A JPS55101924 A JP S55101924A
- Authority
- JP
- Japan
- Prior art keywords
- shutter
- sector ring
- magnets
- conductor patterns
- magnetic fields
- 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
- Shutters For Cameras (AREA)
Abstract
PURPOSE: To make effective use of small-size magnets and ease shutter controlling by so constituting the shutter that the rotating force of a sector ring becomes maximum at the full opening of shutter blade and that the sector ring makes uniformly accelerated motion.
CONSTITUTION: In a shutter close state, the weighting amount of the radiation components of conductor patterns and magnets 1a, 1b is small, but when the sector ring 2 rotates and a shutter 3 assumes a full open state, all the radiation direction components of the conductor patterns superpose in the magnetic fields and the ratios that they are disposed in the magnetic fields of the conductors become maximum. In addition, if the sector angle of the magnet 1 is let β radian, the mean value of the distance between the magnetic fields and the center O of the sector ring 2 a, the set number of conductor patterns n, magnetic flux density B and current I and if these are so selected that the spring constant K of a spring 6 satisfies formula I, then the sector ring 2 is let to perform uniformly accelerated motion. In this way, the shutter control may be readily accomplished by making effective use of the small magnets.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP991079A JPS55101924A (en) | 1979-01-31 | 1979-01-31 | Electromagnetically driven shutter |
DE3003462A DE3003462C2 (en) | 1979-01-31 | 1980-01-31 | Electrodynamic drive for a camera shutter |
US06/353,507 US4415252A (en) | 1979-01-31 | 1982-03-01 | Electromagnetically operated shutter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP991079A JPS55101924A (en) | 1979-01-31 | 1979-01-31 | Electromagnetically driven shutter |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55101924A true JPS55101924A (en) | 1980-08-04 |
JPS6158011B2 JPS6158011B2 (en) | 1986-12-09 |
Family
ID=11733255
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP991079A Granted JPS55101924A (en) | 1979-01-31 | 1979-01-31 | Electromagnetically driven shutter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55101924A (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4945312A (en) * | 1972-09-11 | 1974-04-30 | ||
JPS51107823A (en) * | 1975-03-19 | 1976-09-24 | Fuji Photo Film Co Ltd | |
JPS5374028A (en) * | 1976-11-04 | 1978-07-01 | Olympus Optical Co Ltd | Diaphragm device for camera |
JPS5495233U (en) * | 1977-12-17 | 1979-07-05 |
-
1979
- 1979-01-31 JP JP991079A patent/JPS55101924A/en active Granted
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4945312A (en) * | 1972-09-11 | 1974-04-30 | ||
JPS51107823A (en) * | 1975-03-19 | 1976-09-24 | Fuji Photo Film Co Ltd | |
JPS5374028A (en) * | 1976-11-04 | 1978-07-01 | Olympus Optical Co Ltd | Diaphragm device for camera |
JPS5495233U (en) * | 1977-12-17 | 1979-07-05 |
Also Published As
Publication number | Publication date |
---|---|
JPS6158011B2 (en) | 1986-12-09 |
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