Canon Kabushiki Kaisha

Other

Nisca Corporation

Chikara Aoshima

Hiromu Yasuda

Kousuke Kiyamura

Hideo Tamamura

Toyoshige Sasaki

Hiroaki Maegawa

Akira Egawa

Toru Nagata

Masahiro Takayama

Hiroshi Maeno

Makoto Miyawaki

Toshiharu Ueda

Takashi Ikeda

Takayuki Tsuboi

Yasuhiko Shiomi

Kazuhiro Izukawa

Naoto Mochizuki

Masaaki Ishihara

Hitomi Ito

Toshio Takahashi

Shigeru Kawasaki

Masao Mizumaki

Eriko Namazue

Hideo Ikari

Kazuya Karibe

Jumpei Ishibiki

Kaori Horiike

Shinya Yomogizawa

Akira Kurosawa

Akihiro Nami

A shutter apparatus includes a shutter base having an opening, a light shield configured to reciprocate between a closed state that closes the opening and an open state that opens the opening, a motor, a cam member configured to move the light shield when the cam member is rotated by the motor, and a restricting member configured to contact the cam member and to restrict the cam member from rotating in a first direction and in a second direction different from the first direction, the restricting member being rotatable and including a rotary damper engaged with the cam member. The restricting member is located at different positions in a rotating direction between when the restricting member restricts the cam member from rotating in the first direction and when the restricting member restricts the cam member from rotating in the second direction.

Shutter apparatus and imaging apparatus

A shutter apparatus includes a motor, a cam gear, a driving member, and a blade group. A cam part includes a blade maintaining section configured to maintain one of an open state and a closed state of the blade group when a cam follower slides, and a blade driving section. Where the cam follower slides in the blade maintaining section and the blade driving section in this order, the motor is driven in the micro step driving mode when the cam follower slides in the blade maintaining section, and the motor is driven in the full step driving mode when the cam follower slides in the blade driving section.

Shutter apparatus, image pickup apparatus, and control method for the shutter apparatus

When a stepping motor is used as a driving source for a shutter device, if the stepping motor loses synchronization because of variations in load during driving or the like, it becomes unable to rotate a driving ring at that time, and this disables an exposure operation. In a first zone where a driven member is driven, but a light shielding member remains in a closed state or an open state, the motor drives the driven member in open-loop driving mode. In a second zone where the driven member is driven, and thus the light shielding member moves to the closed state or the open state, the motor drives the driven member in feed-back driving mode.

Shutter device and image pickup apparatus including shutter device

A motor driving apparatus includes a rotor, a first yoke including a first magnetic portion, a first coil configured to, if energized, excite the first magnetic portion, a second yoke including a second magnetic portion, a second coil configured to, if energized, excite the second magnetic portion, a detecting portion including a first detection element, a second detection element, a third detection element, and a fourth detection element, each detection element being configured to detect a rotation position of the rotor, and a controller configured to switch a pole excited by the first magnetic portion and the second magnetic portion by switching an energization direction of the first coil and the second coil based on an output of the detecting portion.

Motor driving apparatus

An optical apparatus having a recording mode that is switchable between motion picture recording and still picture recording includes an optical element, a motor that includes a rotor having a magnet, and a stator having a coil configured to provide a rotational force to the magnet, the motor being configured to drive the optical element, a position sensor configured to detect a position of the rotor of the motor, and a driving circuit configured to select, in accordance with the recording mode, first driving configured to switch an electrization to the coil in the motor in accordance with a determined time interval, or second driving configured to switch an electrization to the coil in the motor in accordance with an output of the position sensor.

Optical apparatus having a recording mode for recording a motion picture and a different recording mode for recording a still picture

A drive apparatus includes a magnet rotor having a plurality of magnetic poles that are magnetized, a stator having a magnetic pole portion that opposes each pole of the magnet rotor, a coil configured to excite the magnetic pole portion, a position detector configured to detect a position of the magnet rotor, a first driver configured to switch an electrification state of the coil in accordance with a preset time interval, a second driver configured to switch an electrification state of the coil in accordance with an output of the position detector, and a controller configured to select the first driver when the output of the position detector is less than a first threshold, and to select the second driver when the output of the position detector is equal to or larger than the first threshold.

Drive apparatus

A light amount adjustment device including a motor which can be reduced in size by reducing radial and axial dimensions and makes it possible to increase the motor output. The device has a stator of a motor drive mechanism formed integrally with a holding member fixed to a cam member with aperture blades and a rotary member for driving them sandwiched therebetween. A stator includes a support portion, and first and second magnetic pole portions. The first and second magnetic pole portions extend toward an outer periphery of the rotor and coils are inserted thereon from respective extending ends. The extending ends are disposed in a manner opposed to the outer periphery of the rotor. The two portions are disposed with an angle therebetween such that respective lines extending in the extending directions intersect with each other.

Motor having small size and high output, and light amount adjustment device equipped with the motor

Drive apparatus having a stepping motor

An optical apparatus having a recording mode that is switchable between motion picture recording and still picture recording includes an optical element, a motor that includes a rotor having a magnet, and a stator having a coil configured to provide a rotational force to the magnet, the motor being configured to drive the optical element, a position sensor configured to detect a position of the rotor of the motor, and a driving circuit configured to select, in accordance with the recording mode, first driving configured to switch an electrization to the coil in the motor in accordance with a determined time interval, or second driving configured to switch an electrization to the coil in the motor in accordance with an output of the position senor.

Optical apparatus with motor drive control selected based on rotor position sensor or determined time interval

A brushless DC motor configured to drive a driven member includes a rotor having a magnet, a stator having a coil configured to provide a rotational force to the magnet, a position detector configured to output a first signal that is periodic, in accordance with a rotating position of the rotor, a signal generator configured to generate a second signal by adding a lead angle to a phase of the first signal output from the position detector, an excitation switch configured to select an excitation to the coil in accordance with the second signal, and a phase change part configured to change the lead angle in accordance with at least one of a position and a moving direction of the driven member.

Brushless DC motor and image pickup apparatus

A diaphragm blade includes a light-shielding, thin-plate blade base made of laser absorptive resin to regulate an aperture, and a first shaft portion made of laser transmissive resin and provided on one surface of the blade base. The first shaft portion includes a cylindrical member which is welded to the protruding weld portion, a protruding weld portion integrally formed with the blade base, and a recess formed at the back side of the protruding weld portion. The cylindrical member has a first recess defined at one end thereof near the blade base and coming into contact with the protruding weld portion, and a second recess defined at the other end. A contact surface of the protruding weld portion is melted with laser beam transmitted through the cylindrical member, whereby the protruding weld portion is welded to the cylindrical member.

Diaphragm blade, method of manufacturing the same, and light quantity controller having the same

A driving device which is capable of increasing a driving speed at which an object to be driven is driven, enhancing quietness in driving the object to be driven, and positioning the object to be driven with high accuracy. A hollow cylindrical magnet () extends along an optical axis, and a plurality of magnetized parts (to) spirally extend along the outer peripheral surface of the magnet. A first yoke (), a second yoke (), a third yoke (), and a fourth yoke () are formed of a soft magnetic material, and each of the yokes has five magnetic pole teeth (tototo, orto) each disposed in opposed relation to a corresponding one of the magnetized parts of the magnet. A lens holder () holds the object to be driven and supports the magnet such that the magnet is movable along the optical axis. First and second coils () for magnetizing the first and second yokes, respectively, are energized to move the magnet along the lens holder in the direction along the predetermined axis to thereby drive the object to be driven.

Driving device, optical apparatus, and image pickup apparatus

A driving device which is capable of increasing a driving speed at which an object to be driven is driven, enhancing quietness in driving the object to be driven, and positioning the object to be driven with high accuracy. A hollow cylindrical magnet () extends along an optical axis, and a plurality of magnetized parts (to) spirally extend along the outer peripheral surface of the magnet. A first yoke (), a second yoke (), a third yoke (), and a fourth yoke () are formed of a soft magnetic material, and each of the yokes has five magnetic pole teeth (to,to,to, ora to) each disposed in opposed relation to a corresponding one of the magnetized parts of the magnet. A lens holder () holds the object to be driven and supports the magnet such that the magnet is movable along the optical axis. First and second coils () for magnetizing the first and second yokes, respectively, are energized to move the magnet along the lens holder in the direction along the predetermined axis to thereby drive the object to be driven.

A focus controller configured to control focus of an optical element includes a focus state detector configured to detect a focus state based on a contrast value of an image formed by the optical element, and a driving mechanism that moves the optical element including a motor, a position sensor configured to detect a position of a rotor in the motor, and a driving controller configured to select, in accordance with the contrast value, first driving configured to switch an electrization to a coil in accordance with an output of the position senor, or second driving configured to switch the electrization to the coil in the motor in accordance with a determined time interval.

Growing community of inventors

Zama, Japan

Chikara Aoshima