Fujifilm Corporation

Shinji Otsuka

Yuichi Kawanabe

Yi Pan

Yukitaka Takeshita

Yukihiro Kaneko

Hajime Fukushima

Mitsuhiko Oka

Kazuyoshi Azegami

Kouhei Awazu

Masahiko Miyata

Takeya Abe

Hiroyuki Iwasaki

Provided is a lens barrel capable of improving stop accuracy. A roller support shaft () is attached to an outer peripheral portion of a cam cylinder (). A torque applying roller () is rotatably supported by the roller support shaft (). A biasing ring () is fitted to an outer peripheral portion of a second fixed cylinder (B) and is held to be movable in an axial direction. The biasing ring () is biased by a biasing spring () and pressed to abut against the torque applying roller (). In a case where the cam cylinder () is rotated, the torque applying roller () rolls along the biasing ring (). A load torque is applied to the rotation of the cam cylinder () by frictional force generated between the torque applying roller () and the roller support shaft () due to the rotation of the torque applying roller ().

Lens barrel

There are provided a lens barrel and an imaging device that can fix a movable member to a stationary frame without providing a member for fixing the movable member. The lens barrel includes a first motor () that drives a third front lens group-holding frame (B) by first magnets (A) provided on the third front lens group-holding frame (B) and a first coil (C), and a second motor () that drives a fourth lens group-movable holding frame (B) by second coils (A) provided on the fourth lens group-movable holding frame (B) and second magnets (B) provided on a fourth lens group base-holding frame (A) fixed to the stationary barrel () and the cam barrel (). The third front lens group-holding frame (B) is fixed by a magnetic force between the first magnets (A) and inner and outer yokes (C,D) provided on the fourth lens group base-holding frame (A) in a case where the application of current to the first coil (C) is stopped.

Lens barrel and imaging device

An image shake correction device includes a movement restrictor that restricts movement of a movable member in directions X, Y, &#x3b8;, and Z. The movement restrictor includes a movement prevention member that is fixed to a base of a support member and prevents the movable member from moving in the direction Z while sandwiching the movable member in cooperation with the support member, a hole portion formed in the support member, and an insertion member that is formed in the movable member and is inserted into the hole portion. A wide width portion of the insertion member has a size that overlaps with the base of the support member even in a state in which an abutting portion of the insertion member is positioned in any position in the hole portion.

Image shake correction device and imaging device

A lens barrel including a first main shaft and a first sub-shaft that guide the movement of a third front lens group (G), a second main shaft and a second sub-shaft that guide the movement of a fourth lens group (G), a hall element that is used to detect the position of the third front lens group (G), and an MR sensor that is used to detect the position of the fourth lens group (G) are disposed on a straight line passing through an optical axis in a cross section orthogonal to the optical axis. The first main shaft and the second main shaft overlap each other in a direction of the optical axis. In a drive unit for each lens group, a plurality of drive magnets are arranged symmetrically with respect to the straight line.

An image shake correction device () includes a movable member (), a support member () including a movement prevention member (B,C) for preventing the movable member () from being lifted, and a movement restriction unit that restricts a movement range of the movable member (). The movement restriction unit includes a hole portion () formed in the support member () and an insertion member () inserted into the hole portion () formed in the movable member (). The insertion member () has an abutting portion () that moves in the hole portion () in directions X, Y, and &#x3b8; with the movement of the movable member (), and a wide width portion () which is wider than the abutting portion ().

There is provided a lens barrel that can easily and reliably prevent an erroneous operation at the time of switching of a manual focus mode. A lens barrel body houses an imaging optical system including a focus lens. A focus operation ring rotates integrally with a first connection ring about an optical axis of the imaging optical system. A second connection ring is movable between an engagement position at which the second connection ring is engaged with the first connection ring and a cam ring and a disengagement position at which the second connection ring is not engaged with both of the first connection ring and the cam ring. A switching-operation ring is movable between a rotation-restriction position at which the switching-operation ring moves the second connection ring to the engagement position and a rotation-allowable position at which the switching-operation ring moves the second connection ring to the disengagement position.

Lens barrel, method of controlling lens barrel, camera body, method of controlling camera body, imaging device, and method of controlling imaging device

An object of the invention is to provide a camera body of which a manual focus mode can be easily switched. A lens barrel includes an imaging optical system, a first operation ring, a second operation ring, and first and second sensors. The first sensor detects the rotation of the first operation ring and the rotation angle and the rotational direction of the first operation ring. The second sensor detects the angular position of the second operation ring. The imaging optical system includes a focus lens. A camera body includes a body control unit. The body control unit selectively executes a first manual focus mode in which the focus lens is moved according to the rotational direction and the rotation angle detected by the first sensor and a second manual focus mode in which the focus lens is moved according to the angular position detected by the second sensor.

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Saitama, Japan

Shinji Otsuka