Panasonic Corporation

Matsushita Electric Industrial Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Makoto Umeda

Kenichi Miyamori

Toshio Inaji

Yoshihiro Ueno

Keizo Miyata

Hiroshi Kohso

Naoki Yoshikawa

Takeshi Sakakibara

Tatsuhiro Enomoto

Hideki Kuwajima

Akio Konishi

Tetsuya Uno

Hiroyasu Fujinaka

Tetsuya Morita

Hirotsugu Yabuta

An optical device actuator comprises a movable frame () including a focus lens (L); a main shaft guide (); a piezoelectric element (); a weight (); a fixed frame (); a guide holding frame (); and a spring (). The piezoelectric element () imparts vibration to a first end () side of the main shaft guide (). The fixed frame () supports the piezoelectric element () and the weight () disposed on the first end () side of the main shaft guide (). The guide holding frame () supports, in a fixed state, the main shaft guide () on a second end () side on the opposite side from the first end () side. The spring () is provided on the first end () side of the main shaft guide (), and presses the piezoelectric element () along the axial direction with respect to the first end () of the main shaft guide () via the weight ().

Optical device actuator and lens barrel provided with same

A lens barrel () comprises a fixed frame (), a main shaft guide () that is fixed to the fixed frame, a movable frame () that moves along the main shaft guide (), a driver (magnet (), drive coil ()) that moves the movable frame () relatively with respect to the fixed frame () along the main shaft guide (), and a vibration imparting unit () that imparts vibration to the main shaft guide ().

A position detection device includes a detection portion and a magnetism generation portion. The detection portion includes a first magnetism detection element and a second magnetism detection element. The first magnetism detection element and the second magnetism detection element are disposed on a plane. The magnetism generation portion is disposed at a position opposite the detection portion. The magnetism generation portion includes mutually opposing magnetic fluxes with respect to the detection portion by performing bipolar magnetization on a face opposite the plane where the first magnetism detection element and the second magnetism detection element are disposed.

Position detection device, drive device, and lens barrel

The actuator disclosed herein comprises a coil, a magnet and a magnetism detection element. The magnet is configured to move a predetermined distance relative to the coil via a magnetic force generated when current is passed through the coil. The magnet includes a first polarization line perpendicular to the direction in which the magnet moves relative to the coil, and a second polarization line parallel to the first polarization line. The magnetism detection element is configured to detect the position of the magnet. The coil faces the first polarization line and the magnetism detection element faces the second polarization line. The length from the second polarization line to a first end of the magnet is equal to or more than 1.25 times the predetermined distance. The first end of the magnet is closer to the magnetism detection element than to the coil.

Actuator, driving device and imaging device

A lens drive unit includes a movable member with lenses; and a guide portion configured to movably guide the movable member back and forth along a predetermined direction and rotatably guide the movable member about a predetermined rotational axis in a plane perpendicular to an optical axis of the lens. A distance r between the gravity center of the movable member and the rotational axis satisfies the following expression (A):&#x2266;&#x221a;{square root over (0.2)}&#x2003;&#x2003;(A).

Lens drive unit, lens barrel and imaging apparatus

An image stabilizing device of the present invention includes: a correction lens holding memberto which a correction lens Gincluded in an optical system of a camera is fixed; a lens holding memberthat holds the correction lens holding member so that the correction lens holding member is movable in a rectilinear direction that is an arbitrary direction in a plane orthogonal to an optical axis A of light entering the correction lens Gand in a rotation direction along an arc in the plane about a rotary shaft Asubstantially parallel to the optical axis A; a driving portion for rectilinear movementthat applies a driving force to the correction lens holding memberin order to drive the correction lens holding memberin the rectilinear direction; and a driving portion for rotationthat applies a driving force to the correction lens holding memberin order to drive the correction lens holding memberin the rotation direction. According to this configuration, it is possible to provide an image stabilizing device that achieves miniaturization, while preventing a deterioration in image stabilizing performance, and a camera including the same.

Image stabilizing device and camera

The present invention provides a head holding member and a head holding method of a head actuator having a very high impact resisting property, and having a simple construction, and a disk device using the head holding member and the head holding method. The head holding member resists an impact applied at a stopping time, and a stable operation can be performed at a power turning-on time.

Head holding member, disk device with the head holding member, and head holding method in the disk, device

A disk apparatus includes (a) an actuator having a head supporting arm with a tab formed on the arm and a voice coil fixed to the arm, which arm is rotatable on a horizontal rotary shaft as well as on a vertical rotary shaft, (b) a voice coil motor having an upper yoke with a magnet fixed to the upper yoke and a lower yoke sandwiching and confronting the voice coil, and (c) a ramp section guiding and holding the tab at a refuge place. When the actuator at the refuge place starts loading with a starter command, a pulsed driving current is applied to the voice coil temporarily for urging the tab against a tab-holding plane of the ramp section, thereby making use of repulsion force generated on the actuator, so that the tab can leave the refuge place efficiently for carrying out the loading operation.

Method of controlling an actuator, and disk apparatus using the same method

A disk apparatus includes: an actuator; a driver; a voltage detectorfor outputting first voltage signal Ed which is produced in a driving coilof the actuator; a voltage signal adjusterfor outputting pseudo disturbance signal ur and generating second voltage signal Edfrom pseudo disturbance signal ur, driving signal u, first voltage signal Ed, and disturbance estimation signal &#x3c4;d; a disturbance estimatorfor estimating the magnitude of disturbance load &#x3c4;d applied to a magnetic headfrom driving signal u and second voltage signal Edto output disturbance estimation signal &#x3c4;d; a position detectorfor generating position error signal e which corresponds to a current position of the magnetic head; a position controllerfor generating control signal c from position error signal e; and a correctorfor generating driving signal u from disturbance estimation signal &#x3c4;dand position control signal c.

Disk apparatus and head positioning method

A disk storage apparatus includes: an actuator positioning a head with respect to a disk; a drive device driving the actuator; a voltage detection device detecting a voltage signal induced in driving the actuator; a disturbance estimation unit estimating the magnitude of load disturbance exerted on the head from a drive signal and the voltage signal, and outputting a disturbance estimation signal; a filter unit cutting off a high frequency component of the disturbance estimation signal, and outputting a filter signal; a position detection unit producing a position error signal corresponding to a current position of the head; a position control unit producing a position control signal based on the position error signal; and a correction unit outputting the drive signal based on the filter signal and the position control signal, and the apparatus controls stable positioning of the head against a resistance value fluctuation of a drive coil of the actuator and a resistance value change.

Growing community of inventors

Osaka, Japan

Makoto Umeda