Canon Kabushiki Kaisha

Rentaro Imai

Keisuke Adachi

Jun Kawanami

Tetsuya Nishio

Toru Kawashima

A shutter apparatus includes a front blade unit and a rear blade unit configured to open and close an opening for exposure control, a front drive member and a rear drive member configured to drive the front blade unit and the rear blade unit between an open position and a closed position of the opening, respectively, a front cam gear and a rear cam gear configured to charge the front drive member and the rear drive member, respectively, a front driving source and a rear driving source connected to and configured to rotate the front cam gear and the rear cam gear, respectively, and a controller configured to control the front driving source and the rear driving source based on an imaging condition so as to change driving times of the front blade unit and the rear blade unit.

Shutter apparatus and image pickup apparatus

A shutter apparatus includes a blade unit configured to open and close an opening used for exposure, a blade moving member configured to move the blade unit between an open position and a closed position of the opening, an urging member configured to urge at least one of the blade unit and the blade moving member in a direction from the closed position to the open position of the opening; and a blade cam member configured to contact the blade moving member as the blade unit moves from the closed position to the open position of the opening.

Shutter apparatus and imaging apparatus

The focal-plane shutter includes a blade drive member, an acceleration member providing a driving force to the drive member, and a lock member reducing bounce of the drive member after blade movement completion and being movable between a first position where a stopper portion thereof enters a movable area of a contact portion of the drive member and a second position where the stopper portion is located outside the movable area. During the blade movement, the contact portion pushes the lock member to move it from the first to second position. Before the blade movement completion, the contact portion is away from the lock member and thereby the lock member is moved from the second to first position by a biasing force. After the completion, the acceleration member pushes the lock member to move it from the first to second position.

Focal-plane shutter and image capturing apparatus

When a blade drive spring has been overcharged when a second cam gear has caused a drive lever to move to a position beyond a position of attraction of an armature by a yoke, a blade lever does not contact the drive lever even if the blade lever has been driven in a direction of opening an aperture by a first blade and a second blade with an urging force of a blade return spring. When the second cam gear has moved to the attraction position form the overcharged position, the blade lever contacts the drive lever before the yoke starts attracting the armature by the attractive force.

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Yokohama, Japan

Rentaro Imai