US 4,364,654 AGranted

Electromagnetic release shutter

AssigneeCanon Kabushiki Kaisha

InventorsMichio Senuma, Fumio Shimada, Yoshihiro Shigeta, Syuichiro Saito, Hiroshi Aizawa, Takehiko Ohniwa, Canon Denshi Kabushiki Kaisha

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Abstract

In a shutter of the electromagnetic release type arranged to have shutter blades locked by locking members in their charged states and to make an exposure by releasing the shutter blades from the locking members, a first locking member is arranged to lock each of the charged shutter blades while a second locking member is arranged to lock the shutter blade when the shutter blade is released from the first locking member and to have the shutter blade released therefrom by the action of an electromagnet. The releasing torque required for the second locking member is smaller than that of the first locking member.

Claims10

Dependent claims

An electromagnetic release shutter for a camera having shutter blades locked by locking members in a charged state and being arranged to expose a light-sensitive face to light by unlocking the shutter blades through the actions of electromagnets, comprising:

(a) first locking members, said members being capable of locking shutter blades in a charged state;
(b) a first releasing member, said member being capable of releasing said shutter blades from their states of being locked by said first locking members;
(c) second locking members, said members being capable of locking said shutter blades in a charged state;
and
(d) second releasing members arranged in combination with electromagnets, said members being capable of releasing said shutter blades by electromagnetic forces from their states of being locked by the second locking members to permit the shutter blades to travel, said second releasing members being arranged to be actuated after the shutter blades are released by the first releasing member from their states of being locked by the first locking members;
said second releasing members being armatures of electromagnets, said armatures being arranged to be driven by the electromagnets and to hit said second locking members after they have been displaced by the electromagnets to predetermined extents.

3 more elements

comprising:
(a) a shutter charging member which is arranged to charge the shutter and also to lock the shutter in the charged state;
(b) a charge releasing member arranged to release the shutter from the charged state in which the shutter is locked by the shutter charging member, said charge releasing member being arranged to perform the charge releasing action after the start of a shutter releasing operation and before the shutter begins to travel;
(c) a second locking member arranged to be capable of locking the shutter in a charged state;
and
(d) a second releasing member arranged in combination with an electromagnet, said member being capable of releasing the shutter by an electromagnetic force from its state of being locked by the second locking member to permit the shutter to travel, said second releasing member being arranged to be actuated after the shutter is released by the charge releasing member from its state of being locked by said shutter charging member;
said second releasing member being an armature of said electromagnet, said armature being arranged to be driven by said electromagnet and to hit said second locking member after the second releasing member is displaced by the electromagnet to a predetermined extent.

4 more elements

Dependencies are inferred from the claim text.