JPS6440933A - Motor-driven stop device - Google Patents
Motor-driven stop deviceInfo
- Publication number
- JPS6440933A JPS6440933A JP19772987A JP19772987A JPS6440933A JP S6440933 A JPS6440933 A JP S6440933A JP 19772987 A JP19772987 A JP 19772987A JP 19772987 A JP19772987 A JP 19772987A JP S6440933 A JPS6440933 A JP S6440933A
- Authority
- JP
- Japan
- Prior art keywords
- gear plate
- stop
- gear
- motor
- restrained
- 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
- Diaphragms For Cameras (AREA)
Abstract
PURPOSE:To reduce the size and weight of a motor-driven stop device and to control the stop tool closely by forming a 1st gear plate of a magnetic body and eliminating the need to arrange a magnet on a surface facing a 2nd gear plate, and driving the stop tool through the differential rotation between the 1st and 2nd gear plates. CONSTITUTION:When a control current flows through winding 16 in order, magnetic flux is produced in the axial direction of the 2nd gear plate 15 to attract the 1st gear plate 11 and 2nd gear plate 15, and a 1st tooth part 11b and a 2nd tooth part 15a engage each other in order. Then the 1st and 2nd gear plates 11 and 15 differ in the number of teeth and one is restrained from rotating, so the other gear plate which is restrained rotates to drive the stop tool 18, thereby opening and closing an optical path through the sliding of stop blades. Further, the 1st gear plate 11 is made of the discoid annular magnetic body and a magnet need not be arranged separately, so the whole device never increases in size axially.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19772987A JPS6440933A (en) | 1987-08-07 | 1987-08-07 | Motor-driven stop device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19772987A JPS6440933A (en) | 1987-08-07 | 1987-08-07 | Motor-driven stop device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6440933A true JPS6440933A (en) | 1989-02-13 |
Family
ID=16379370
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19772987A Pending JPS6440933A (en) | 1987-08-07 | 1987-08-07 | Motor-driven stop device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6440933A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004205967A (en) * | 2002-12-26 | 2004-07-22 | Canon Electronics Inc | Light quantity adjusting device and optical equipment |
-
1987
- 1987-08-07 JP JP19772987A patent/JPS6440933A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004205967A (en) * | 2002-12-26 | 2004-07-22 | Canon Electronics Inc | Light quantity adjusting device and optical equipment |
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