Murata Manufacturing Co., Ltd.

Toshiaki Yamashita

Tsuguji Kambayashi

Katsumi Fujimoto

Manabu Sumita

Eitaro Kameda

Shuho Saito

Isao Okada

Osamu Segawa

An optical control device is provided that controls an angle of a reflecting member. The optical control device includes a holding portion, an actuator, an angle detection unit, and a control unit. The angle detection unit is provided at a position outside an outer shape of the actuator in an actuator holder on which the actuator is placed, and detects a rotation angle of the reflecting member. The control unit drives the actuator based on the angle detected by the angle detection unit, and controls the rotation angle of the reflecting member.

Optical control device and head-up display apparatus including the same

An ultrasonic motor is provided that includes a stator having a vibrator and first to fourth piezoelectric elements, a rotor, and a wiring member including an insulating substrate and first and second wirings. The piezoelectric elements are dispersedly arranged along the circumferential direction of a traveling wave circulating around an axial direction so that the traveling wave is generated by the vibrator being vibrated. The first and third piezoelectric elements face each other across the center of a traveling wave. The first wiring is electrically connected to the first and third piezoelectric elements, and the second wiring is electrically connected to the second and fourth piezoelectric elements. The second wiring passes over the third piezoelectric element from the second piezoelectric element side and extends toward the side of fourth piezoelectric element.

Ultrasonic motor with improved rotation efficiency

An ultrasonic motor is provided that includes a stator including first and second piezoelectric elements provided on a first main surface of a vibrator having a plate shape, a rotor in direct or indirect contact with a second main surface of the vibrator, and a wiring member connected to the first and second piezoelectric elements. Moreover, the wiring member includes first and second connection members connected to the first and second piezoelectric elements, a central wiring portion connected to the first and second connection members and provided in a region including a center of an axial direction, and an extended wiring portion connected to the central wiring portion. The central wiring portion is fixed to the first main surface of the vibrator and the extended wiring portion is lifted from the first main surface of the vibrator.

Ultrasonic motor with stabilized stator vibration

A piezoelectric power generator having a first elastic body which deforms along a first direction when subject to a stress, and a power-generating element. The power-generating element includes a second elastic body and a piezoelectric element. The second elastic body includes a fixing portion and an abutting portion. The fixing portion is fixed to the first elastic body. The abutting portion is arranged on one side in a first direction with respect to the fixing portion. The abutting portion abuts against the first elastic body, but is not fixed to the first elastic body. At least one of the first elastic body and the second elastic body is provided with a slippage suppression mechanism that suppresses slipping of the abutting portion with respect to the first elastic body when the first elastic body is deformed.

Piezoelectric power generator

A piezoelectric buzzer includes a piezoelectric diaphragm stored in a case having a case body and a back cover, and a pair of metal terminals which are electrically connected to the piezoelectric diaphragm and drawn out from the back cover. The metal terminals have terminal drawing portions, terminal fixing portions which are arranged along an inner surface of the back cover, and connecting portions which are bent from inner ends of the terminal fixing portions so that the bent portions are substantially U-shaped as viewed from above while forward ends thereof are separated from the inner surface of the back cover and brought into contact with the piezoelectric diaphragm.

Piezoelectric buzzer

A parallel type piezoelectric bimorph vibrator is used for a piezoelectric buzzer or a piezoelectric loud-speaker, which is cemented at both ends of a conductive diaphragm together with piezoelectric elements, and is provided at part of the outer periphery of a diaphragm with a cutout, the outer peripheries of the piezoelectric elements facing the cutout. Electrodes outside both the piezoelectric elements are connected by a conductor at the position corresponding to the cutout, so that the existence of the cutout prevents the conductor from being brought into contact with the diaphragm.

Growing community of inventors

Kyoto-fu, Japan

Toshiaki Yamashita