Electromagnetic release device for single-lens reflex camera

Details Electromagnetic release device for single-lens reflex camera Electromagnetic release device for single-lens reflex camera

1984-04-04

1986-03-25

Perkey, William B.

G03B 1912

Patent

active

045779465

ABSTRACT:
An electromagnetic release device for a single-lens reflex camera which maintains an armature engaged with an electromagnet used to effect shutter release for a maximum period of time to prevent accumulation of dust between the armature and the pole face of the electromagnet. An energizing spring urges an armature lever towards the electromagnet. An armature disengaging spring connected between the armature lever and a mirror driving lever urges the armature lever away from the electromagnet. The armature disengaging spring is positioned and has a spring constant such that a tensile force provided thereby for moving the armature lever away from the electromagnet when the mirror driving lever reaches an upper position thereof is smaller than the force of energizing spring urging the armature lever towards the electromagnet.

REFERENCES:
patent: 4429972 (1984-02-01), Yamamichi et al.
patent: 4502769 (1985-03-01), Nakamori et al.

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