Fujifilm Corporation

Tsuyoshi Mitarai

Atsushi Misawa

Tatsuo Saito

Nobuaki Ueki

Masahiro Hideshima

An optical system is disposed on an opposite side to an object side with respect to an objective lens, and includes: a rotational movement member that is rotationally movably supported; and a plurality of light transmissive regions that are formed in the rotational movement member, are configured to be able to be disposed at a position intersecting an optical axis of the objective lens, and have different light transmission characteristics, and a rotational movement axis of the rotational movement member is configured to be non-parallel with the optical axis of the objective lens.

Optical system, lens device, imaging device, and projection device

There is provided a lens device that prevents dust from entering a space in which a movable lens is moved. A movable lens is moved in the direction of an optical axis. A holding member, which extends in the direction of the optical axis, is formed at an end portion of the movable lens. A magnet is fixed to an end portion of the holding member. A hall IC is disposed in a closed storage space at a position facing the magnet. A signal, which corresponds to the position of the magnet in the direction of the optical axis, is output from the hall IC. Since the hall IC is disposed in the storage space closed by a storage box, the entry of dust, which is caused by the hall IC, into a space in which the movable lens is moved is prevented.

Lens device

The first and second optical elements are held so as to be rotatable relative to each other about an optical axis. An aberration, which can cancel an aberration caused by a color separation prism, is generated from a synthesis of aberrations generated by the first and second optical elements in a case in which the second optical element is positioned at a first position with respect to the first optical element. The aberration generated by the first optical element is cancelled by the aberration generated by the second optical element in a case in which the second optical element is positioned at a second position with respect to the first optical element. The second optical element is positioned at the first position in a case in which the lens device is to be used in a 3-CCD type first camera device, and the second optical element is positioned at the second position with respect to the first optical element in a case in which the lens device is to be used in a single-CCD type second camera device.

Lens device, camera system, and aberration correction unit

A lens device includes a Hall IC detecting whether extender lenses are positioned on an optical axis or are retreated from the optical axis by rotating the extender lenses about a rotating shaft by a predetermined angle. An inner space of a lens barrel is divided into first to fourth spaces by a first plane passing through the rotating shaft and the optical axis and a second plane passing through the optical axis and perpendicular to the first plane. When the extender lenses are positioned on the optical axis, a magnet is fixed to a portion in the first space of an extender lens frame and the Hall IC is disposed in the first space on a side substantially opposite to a portion in which the rotating shaft is present, so that the Hall IC is not an obstacle even while the extender lenses rotate.

A lens device comprising a barrel body which movably holds a focus lens in an optical axis direction; a focus ring provided on an outer circumferential part of the barrel body and having a regulated rotation range; a rotation position detecting unit which detects a rotation position in the rotation range of the focus ring; a touch sensor provided on the outer circumferential part of the barrel body so as to be adjacent to the focus ring; and a control device which perform absolute position control of moving the focus lens to an absolute position corresponding to the rotation position detected by the rotation position detecting unit and relative position control of moving the focus lens to a relative position corresponding to a sliding amount on the touch sensor on an outer circumferential surface in a circumferential direction.

Lens device and method of controlling focus

An appropriate operation angle (actuation angle) corresponding to a use is obtained by a relatively simple structure. A focus ringis mounted around a focus camWhen the focus ringis moved to a front end side, a gear formed in the focus ringmeshes with a gearof the focus camand the rotation of the focus ringis directly transmitted to the focus camWhen the focus ringis moved to a rear end side, the gear formed in the focus ringmeshes with pinionsmounted on the focus camand the rotation of the focus ringis directly transmitted to the focus camthrough the pinionsA half of the rotation angle of the focus ringis the same as the rotation angle of the focus cam

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Saitama, Japan

Tsuyoshi Mitarai