JPS55101924A - Electromagnetically driven shutter - Google Patents

Electromagnetically driven shutter

Info

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
Application number
JP991079A
Other languages
Japanese (ja)
Other versions
JPS6158011B2 (en
Inventor
Michiro Hirohata
Yukio Ogawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP991079A priority Critical patent/JPS55101924A/en
Priority to DE19803003462 priority patent/DE3003462A1/en
Publication of JPS55101924A publication Critical patent/JPS55101924A/en
Priority to US06/353,507 priority patent/US4415252A/en
Publication of JPS6158011B2 publication Critical patent/JPS6158011B2/ja
Granted legal-status Critical Current

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
JP991079A 1979-01-31 1979-01-31 Electromagnetically driven shutter Granted JPS55101924A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP991079A JPS55101924A (en) 1979-01-31 1979-01-31 Electromagnetically driven shutter
DE19803003462 DE3003462A1 (en) 1979-01-31 1980-01-31 ELECTROMAGNETICALLY OPERATED LOCKING
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
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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