GB2003327A - Improvements in or relating to release electromagnet assemblies - Google Patents

Improvements in or relating to release electromagnet assemblies

Info

Publication number
GB2003327A
GB2003327A GB7834211A GB7834211A GB2003327A GB 2003327 A GB2003327 A GB 2003327A GB 7834211 A GB7834211 A GB 7834211A GB 7834211 A GB7834211 A GB 7834211A GB 2003327 A GB2003327 A GB 2003327A
Authority
GB
United Kingdom
Prior art keywords
electromagnet
permanent magnet
yoke
magnet body
flux
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
GB7834211A
Other versions
GB2003327B (en
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.)
Olympus Corp
Original Assignee
Olympus Optical Co Ltd
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
Priority claimed from JP52101375A external-priority patent/JPS6022805B2/en
Priority claimed from JP13271177A external-priority patent/JPS6022806B2/en
Application filed by Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Publication of GB2003327A publication Critical patent/GB2003327A/en
Application granted granted Critical
Publication of GB2003327B publication Critical patent/GB2003327B/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/38—Releasing-devices separate from shutter

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnets (AREA)
  • Shutters For Cameras (AREA)

Abstract

A release electromagnet assembly includes a permanent magnet body 15 associated with a movable member 19, and an electromagnet which co-operates with the permanent magnet such that magnetic attraction between the latter and the yoke 12 of the electromagnet is effective to constrain the movable member. The electromagnet is capable in energisation of coil 13 of producing a flux opposing such magnetic attraction to release the movable member for free movement by spring 21. The permanent magnet body has a magnetic pole of a single polarity disposed opposite the limb ends of the yoke of the electromagnet so that flux from the permanent magnet body passes along a magnetic path which is partly external of and partly within the yoke of the electromagnet. Energization of the release coil 13 produces a flux which passes along a magnetic path which is mainly within the yoke and which opposes the flux from the permanent magnet body, thus releasing the movable member from the constraint applied by the permanent magnet body. The yoke may be of e.g. ferrite. <IMAGE>
GB7834211A 1977-08-23 1978-08-22 Release electromagnet assemblies Expired GB2003327B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP52101375A JPS6022805B2 (en) 1977-08-23 1977-08-23 Electromagnetic device for releasing restraint
JP13271177A JPS6022806B2 (en) 1977-11-04 1977-11-04 release type electromagnet device

Publications (2)

Publication Number Publication Date
GB2003327A true GB2003327A (en) 1979-03-07
GB2003327B GB2003327B (en) 1982-02-10

Family

ID=26442257

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7834211A Expired GB2003327B (en) 1977-08-23 1978-08-22 Release electromagnet assemblies

Country Status (3)

Country Link
DE (1) DE2836705C2 (en)
FR (1) FR2401439A1 (en)
GB (1) GB2003327B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1072050A1 (en) * 1998-04-13 2001-01-31 Walker Magnetics Group, Inc. Electrically switchable magnet system
EP1615242A2 (en) * 2004-07-06 2006-01-11 Saia-Burgess Dresden GmbH Electromagnetic actuator

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10159510A1 (en) * 2001-12-04 2003-06-12 Welcker F Safety unit for the gas supply to an equipment has a spring loaded valve, kept in the open position by a lever mechanism which can be tripped by levers held by an anchor at a magnet holder

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1047848A (en) * 1962-08-09 1966-11-09 H E & B S Benson Ltd Improvements in d.c. electromagnets with permanentmagnet armatures
JPS5740522B2 (en) * 1974-01-18 1982-08-28
US3914723A (en) * 1974-07-15 1975-10-21 Price Edison Inc Positive action magnetic latching relay
DE2654111A1 (en) * 1975-12-11 1977-06-16 Minolta Camera Kk Magnetic contact operating device fed with signal - has yoke and cross piece made from same piece with armature spring

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1072050A1 (en) * 1998-04-13 2001-01-31 Walker Magnetics Group, Inc. Electrically switchable magnet system
EP1072050A4 (en) * 1998-04-13 2001-07-25 Walker Magnetics Group Inc Electrically switchable magnet system
EP1615242A2 (en) * 2004-07-06 2006-01-11 Saia-Burgess Dresden GmbH Electromagnetic actuator
EP1615242A3 (en) * 2004-07-06 2011-09-14 Saia-Burgess Dresden GmbH Electromagnetic actuator

Also Published As

Publication number Publication date
GB2003327B (en) 1982-02-10
DE2836705A1 (en) 1979-03-08
FR2401439A1 (en) 1979-03-23
DE2836705C2 (en) 1984-10-31
FR2401439B1 (en) 1982-10-29

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee