Tdk Corporation

Nec Corporation

Masahiro Hosokawa

Naoki Yusa

Takuto Horii

Mitsunao Homma

Hiroshi Tojo

Tatsuya Taki

Seiji Fukuoka

Atsushi Ezawa

Toshiki Maruyama

Mio Hamashima

Noriyuki Kawano

Shusuke Ichihashi

Kazuo Yanoo

A lens drive device including, a variation in a distance between the support point and an action point of the leaf spring member is suppressed, and a variation in a biasing force of the leaf spring member determined according to the distance between the support point and the action point is also suppressed. As a result, a frictional force of the frictional engagement between a friction engagement member and an actuator is uniform, and driving characteristics of the lens drive device are uniform.

Lens drive device

An optical driving device includes: a movable portion to which an optical element is attachable; a drive portion which movably holds the movable portion; and a fixing portion which holds the drive portion, in which each end portion of a first shaft provided in the drive portion and slidably holding the movable portion and each end portion of a second shaft provided separately from the drive portion and slidably supporting the movable portion are fixed to the fixing portion. A diameter of the first shaft is larger than a diameter of the second shaft and a distance between fixing positions of the fixing portion to which each end portion of the first shaft is fixed is smaller than a distance between fixing positions of the fixing portion to which each end portion of the second shaft is fixed.

Optical driving device

A piezoelectric drive device including: laminated piezoelectric element including a first end face and a second end face opposed to the first end face; a weight member attached to the first end face; and a shaft attached to the second end face, in which a moving member, engaged to the shaft movable in an axial direction, is moved by activating the laminated piezoelectric element. Inside the laminated piezoelectric element, a first internal electrode and a second internal electrode, respectively having a plane surface approximately perpendicular to the first end face and the second end face, are laminated in Y axial direction, approximately perpendicular to the first internal electrode and the second internal electrode with a piezoelectric layer in-between. The piezoelectric drive device, in which the laminated piezoelectric element is difficult to bend, even when the load is applied to the shaft from a lateral direction, is provided.

Piezoelectric drive device

A lens driving device includes a first column portion rising from a base member toward a movable element side and configured to limit a moving range of the movable element moved by a piezoelectric actuator, and a case covering the base member so as to accommodate the movable element, the piezoelectric actuator, a lens carrier, and a column portion. The first column portion abuts on an inner surface of the case.

Lens driving device havng a movable element and a first column portion configured to limit a range of the movable element

A lens drive unit that prevents an actuator from being inclined is provided. In the lens drive unit, when a lens frame is displaced in a direction orthogonal to a direction in which the actuator extends and contracts with respect to a base member by, for example, impact from an outside of the lens drive unit, a drive shaft of the actuator abuts on a first lateral wall and a column, so that the actuator is prevented from being inclined with respect to the base member.

Lens drive unit

A lens drive unit that offers enhanced reliability in connection between an actuator electrode and an electric wire is provided. In the lens drive unit, an actuator has a weight housed in an holding portion of a base member and is thereby fixed in the base member. Electrodes on a lateral surface of the weight directly contact respective terminal electrodes on an inner lateral surface of the holding portion, so that an electrical connection is established therebetween. The arrangement enhances reliability in connection between the actuator electrodes and the terminal electrodes.

An X-axis movable object holding portion to hold an X-axis movable object is provided at a position facing an X-axis actuator in a base member. A Y-axis movable object holding portion to hold a Y-axis movable object is provided at a position facing a Y-axis actuator in the X-axis movable object. An X-axis stopper mechanism for restricting a movement range of the X-axis movable object is provided in the base member. A Y-axis stopper mechanism for restricting a movement range of the Y-axis movable object is provided in the X-axis movable object.

A lens driving device includes a base member, a movable element movable with respect to the base member, a piezoelectric actuator configured to move the movable element, a base-member-side urging part, and a movable-element-side urging part. The base-member-side urging part urges the movable element toward the base member side. The movable-element-side urging part urges the piezoelectric actuator toward the movable element side.

Lens driving device

A lens drive for driving a lens having, in seriatum along the optical axis of the lens, a base member, an X-axis movable object, a Y-axis movable object and a lens carrier. The base member, the X-axis movable object, the Y-axis movable object and the lens carrier overlap circumferentially around the optical axis in the direction of the optical axis. A first conductive suspension wire connects wiring of the Y-axis movable object and the base member. A second conductive suspension wire connects wiring of the X-axis movable object and the base member. The first and second conductive suspension wires have substantially the same length.

An X-axis movable object holding portion to hold an X-axis movable object to be movable in an X-axis direction is provided at a position facing an X-axis actuator with an optical axis between the X-axis movable object holding portion and the X-axis actuator in a base member. A Y-axis movable object holding portion to hold a Y-axis movable object to be movable in a Y-axis direction is provided at a position facing a Y-axis actuator with the optical axis between the Y-axis movable object holding portion and the Y-axis actuator in the X-axis movable object. An auxiliary member supports a carrier actuator to move a lens carrier. In the lens carrier, a movement of the direction of the optical axis is regulated by a carrier stopper mechanism.

A gravity center obtained by combining a gravity center of an X-axis movable object, a gravity center of a Y-axis movable object, and a gravity center of a lens carrier is located in a triangle, as vertexes, having a contact portion in which an X-axis friction engagement portion comes into contact with an X-axis drive shaft, a contact portion in which a first X-axis support portion comes into contact with an X-axis movable object holding portion, and a contact portion in which a second X-axis support portion comes into contact with the X-axis movable object holding portion.

A lens driving apparatus has a lens portion, a first driving portionandto cause a movement of a movable unitincluding said lens portionrelatively to a fixed portionalong a vertical direction of a light axis of said lens portion, a second driving portionandto cause a movement of said lens portion relatively to said fixed portionalong said light axis, an image sensorheld on said fixed portionto detect a light which comes through said lens portion, an inner casingheld on said fixed portionto cover said movable unitand said image sensor, and a planar flexible printed circuitto which a shake detection sensordetecting a shake of said fixed portionis connected. The planar flexible printed circuitis attached to contact with a sidewall surface of said inner casingparallel to the light axis of said lens.

Lens driving apparatus

There is disclosed a method for switching access folders in accordance with a confidential mode. In this method, a confidential root directory is located below a normal root directory. A directory structure constituted by the at least one confidential folder other than a confidential root directory is the same as that constituted by at least one normal folder other than a normal root directory. A file access request from an application program to a disk device is received. If the application program is operating as a process in a confidential mode, file access to the confidential file in the confidential folder is executed through a kernel, by rewriting a specified file path name with a file path name corresponding to the confidential folder below the confidential root directory. If the application program is operating as a process in the normal mode, file access to the confidential file in the confidential folder is not permitted.

Growing community of inventors

Tokyo, Japan

Masahiro Hosokawa