New Shicoh Technology Co., Ltd.

Shicoh Engineering Co., Ltd.

Igarashi Electric Works Ltd.

Junichi Tada

Manabu Shiraki

Hiroshi Sato

Hiroki Narushima

Yoshitaka Mori

A control device for a brushless DC servo motor which uses a MR sensor unit and controls the motor with high precision by a closed loop. The motor control device comprises a control unit for controlling power supplied to three pairs of stator coils of U, V and W phases. The control unit generates phase information for each of the U, V and W phases and obtains an absolute origin position of the rotary shaft with respect to the driving signal, when the brushless DC servo motor is driven, based on the synchronization relationship of: a driving signal rising phase from zero; an integrated value peak phase of counter electromotive force to the phase stator coil obtained by driving the motor; and a rising phase of the output signal of the A phase or the B phase output from the MR sensor unit corresponding to zero of the driving signal.

Control device for brushless DC servo motor

The electric parking brake device comprising a resolver which has a base arranged in a housing so as to face a rotating plate fixed to a rotation axis of an electric motor, wherein a first sheet coil comprising a detecting coil and a second sheet coil comprising a primary coil of an output transformer coupled to a detecting coil are arranged on the opposite face of the rotating plate, and

Electric parking brake device

A rotation angle detecting device and an electric motor provided with the rotation angle detecting device. The rotation angle detecting device has both a reduced thickness and outer diameter and is easily fixed to a small-sized electric motor. The rotation angle detecting device has a first sheet coil, provided with an excitation coil, mounted on a base fixed to a fixed body, a second sheet coil, provided with a detecting coil, mounted on a surface of a rotating plate opposite the base, the rotating plate is fixed to a rotating shaft, a third sheet coil, provided with a primary coil of an output transformer, mounted on another surface of the rotating plate opposing to a cover, and a fourth sheet coil, provided with a secondary coil of the output transformer, mounted on a facing surface of the cover opposite the rotating plate.

Rotation angle detecting device and an electric motor provided with the rotation angle detecting device

An autofocus camera is provided which restrains and corrects any tilt that may occur in the optical axis direction without the need of providing any additional new sensors for that purpose. The autofocus camera includes an image sensor for receiving light from an object and converting the light into corresponding electrical signals, a lens driving device having a lens for focusing the light from the object upon said image sensor, and a control portion for causing said lens driving device to adjust any tilt that may occur in the optical axis in response to the electrical signals received from said image sensor. The control portion is operated to cause the lens driving device to adjust any tilts of the optical axis with respect to the image sensor in the orthogonal directions with each other, so that the resolution signals at the predetermined positions of said image sensor can be maximized.

Lens driving device, camera, and camera-equipped electronic device

The vibration producing device includes a driving shaft being placed under slight rapid vibratory movements in its axial direction, a slight rapid vibratory movements producing member coupled with one end of the driving shaft for causing the driving shaft to be vibrated with the slight rapid vibratory movements, a casing for supporting at least either the driving shaft or the slight rapid vibratory movement producing member in such a manner that the driving shaft can be vibrated with the slight rapid vibratory movements in its axial direction, and a weight member to be coupled with the driving shaft in order to permit the weight member to move in its axial direction under the slight rapid vibratory movements of the driving shaft, wherein the casing is vibrated by allowing the weight member to be moved forwards and backwards alternately along the driving shaft in its axial direction.

Vibration producing device as well as electronic device and human body fitting article both employing such vibration producing device

A linear driving device includes a slight rapid vibratory movements producing member coupled with one end of a driving shaft which causes said driving shaft to be moved in said an axial direction, a casing for supporting at least either said driving shaft or said slight rapid vibratory movements producing member so that said driving shaft can be moved in said axial direction; and a moving body to be coupled with said driving shaft so that said moving body can be moved in the axial direction. When said moving body moves from one end side toward the other end side of said driving shaft, a part of said moving body which forms the surface facing the other end side opposite to said one end of said moving body may hit against a component which stops said moving body from moving further toward the other end side of said driving shaft.

Linear driving device, electronic device and human body fitting article both employing such linear driving device

A driving member, a linear driving device using the driving member, a camera device and an electronic device are provided. The driving member () includes a deformable thin plate () having a flexible thin plate () capable of expanding and contracting itself under the applied voltage and an elastic thin plate () having at least one side thereof rigidly fixed to the flexible thin plate () and a driving shaft () having its one axial end rigidly fixed to the deformable thin plate () and being capable of undergoing displacements that are operatively associated with the deformation of the deformable thin plate (), wherein the driving shaft () has the lateral side portion () of the one axial end thereof rigidly fixed to the corresponding inner side portion of a through hole formed on the deformable thin plate ().

Driving member, linear driving device, camera device, and electronic device

Autofocus camera for adjusting tilt in the optical axis of a lens, and camera-equipped electronic device

In a linear driving device, in which a driving shaftvibrates in an axial direction by a vibration member, as a result of which a movable bodythat is frictionally contact with the driving shaftslides along the axial direction of the driving shaft, the vibration memberincludes a piezoelectric elementand a vibratormade of a metal plate having elasticity; the vibratoris fixed to the piezoelectric elementby superimposing plate faces thereof; the driving shafthas a trunkalong which the movable bodyslides, and an end portionto be fixed to the vibrator; a base surfaceof the end portionabuts with and is fixed to the vibrator; and an area of the base surfaceis smaller than a cross sectional area of the trunk

Linear driving device

A lens drive device having a simple structure and small sized. The lens drive device () has a lens holder (), a drive shaft () into which one end of the lens holder () is fitted and placed along the direction of the optical axis of lenses (), and a piezo element () provided at a base end () of the drive shaft (). The base end () of the drive shaft () is fixed to a vibrator () of the piezo element (), and the drive shaft () is vibrated in the direction of its axis by vibration of the vibrator () produced by conducting a pulse current to the piezo element (). The lens holder () is moved in the optical axis direction by using repetition of inertia force and friction force of the holder relative to the drive shaft ().

Lens drive device

A magnetic position detecting apparatus of the present invention includes a first magnetic resistance circuit and a second magnetic resistance circuit each having multiple magnetic resistance elements arranged to be opposite to a magnetized surface, wherein the first and the second magnetic resistance circuits are arranged in such a way that the resistance elements of the first and the second magnetic resistance circuits are connected to one another in series and arranged in a comblike shape to be parallel to one another along a current path of each magnetic resistance element, the magnetic resistance elements of the second magnetic resistance circuit are placed between the magnetic resistance elements of the first magnetic resistance circuit.

Magnetic position detecting apparatus having a plurality of magnetic resistance circuits arranged in a comblike shape

In a position detecting apparatusof the present invention, magnetic resistance circuits A and B of a first main circuitinclude a reference magnetic resistance element +A, an even harmonic correction magnetic resistance element +Abeing placed at a position shifted by (1/4)&#x3bb; or (3/4)&#x3bb; from the reference magnetic resistance element +A, with respect to a reference wave, and a third harmonic correction magnetic resistance element +Abeing placed at a position shifted by (1/6)&#x3bb; from the reference magnetic resistance element, with respect to a reference wave, and magnetic resistance circuits A' and B&#x2032; of a second main circuitinclude the magnetic resistance circuit of the second main circuitincludes a reference magnetic resistance element +A&#x2032;a fifth harmonic correction magnetic resistance element +A&#x2032;being placed at a position shifted by (1/10)&#x3bb; from the adjacent magnetic resistance element, with respect to a reference wave and a fifth harmonic correction magnetic resistance element +A&#x2032;being placed at a position shifted by (4/15)&#x3bb; from the reference magnetic resistance element +A&#x2032;with respect to a third harmonic wave.

Growing community of inventors

Yamato, Japan

Junichi Tada