Electromagnetic device for cameras

Details Electromagnetic device for cameras Electromagnetic device for cameras

1994-07-28

1996-05-14

Mathews, A. A.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Retarded or delayed type

3542711, 335271, 335277, G03B 908, G03B 902, H01F 708

Patent

active

055172679

ABSTRACT:
An electromagnetic device for cameras includes a yoke that has a contact surface and is attached to a base plate. An armature having a contact surface faces and is movable into contact with the contact surface of the yoke. An armature shaft has one end attached perpendicularly to the contact surface of the armature, and has a catch at its opposite end. An armature lever is freely movable on the shaft between the catch and the armature. A biasing member, such as a spring, biases the armature away from the yoke. A coil is provided on the yoke, and when in an excited state, causes the contact surface of the armature to come into contact with the contact surface of the yoke to magnetically adhere the armature to the yoke, and when in an unexcited state, disengages the armature from the yoke. The armature lever includes one or more openings, such as a circular hole and/or an elongated slot, that are used to apply an elastic adhesive between the armature lever and the armature.

REFERENCES:
patent: 3664251 (1972-05-01), Vincent
patent: 4205287 (1980-05-01), Shimizu et al.
patent: 4862127 (1989-08-01), Lundstrom et al.

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