Tdk Corporation

Atsushi Ezawa

Takuto Horii

Tatsuya Taki

Toshiki Maruyama

Hiroshi Tojo

Kaoru Kijima

Masahiro Hosokawa

Mitsunao Homma

Naoki Yusa

Seiji Fukuoka

Mio Hamashima

Shunsuke Ueno

Akihiro Takeda

Yoshiki Ohta

Yoshikazu Shimura

Tomohiro Takeda

Ryuichi Sakai

Miho Bamba

Atsuko Murakoshi

Haruna Sumi

An audio device includes a vibration member, and a first piezoelectric vibrator and a second piezoelectric vibrator that are provided on the vibration member. A natural frequency of the first piezoelectric vibrator is larger than a natural frequency of the second piezoelectric vibrator.

Audio device

In a vibration unit, a first electrode of a sensor circuit of a control unit is electrically connected to a first external electrode of a first piezoelectric element, a second electrode of the sensor circuit is electrically connected to a second external electrode of the first piezoelectric element, a first electrode of a drive circuit is electrically connected to a first external electrode of a second piezoelectric element, and a second electrode of the drive circuit is electrically connected to a second external electrode of the second piezoelectric element. Only a relatively small voltage induced by an electromotive force occurring due to the flexure of the first piezoelectric element is applied to the sensor circuit. In addition, only a relatively large drive voltage to be applied to the second piezoelectric element is applied to the drive circuit.

Vibration unit

In a vibration unit, a piezoelectric element enters an internal space of a through hole; and thereby, a second case member can be arranged proximate to a first case member. Therefore, a thickness of the vibration unit can be reduced, namely, a height of the vibration unit can be reduced. As described above, since the thickness of the vibration unit is reduced, a size of the vibration unit can be reduced.

Vibration unit having a piezoelectric element as the vibration source

A vibrating device includes a piezoelectric element, a resin member having electric insulation, a vibrating member made of metal, a first adhesive layer, and a second adhesive layer. The resin member includes a first principal surface and a second principal surface opposing each other. The vibrating member includes a third principal surface and a fourth principal surface opposing each other. The first adhesive layer joins the piezoelectric element and the first principal surface. The second adhesive layer joins the second principal surface and the third principal surface. An area of the resin member is greater than an area of the piezoelectric element, and an area of the vibrating member is greater than the area of the piezoelectric element. An area where the second adhesive layer adheres to the vibrating member is greater than an area where the first adhesive layer adheres to the resin member.

Vibrating device

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.

The present invention relates to a piezoelectric driving devicecapable of moving the movable memberalong the axis direction engaged in a movable manner to the axial direction with respect to the shaft. A pair of the external electrodesandrespectively comprises the first external connection partand the second external connection partformed at the lower end face in Z axis direction by being insulated against each other. At the opposing face of the weight memberfacing against the lower end face of the element, the first circuit patternand the second circuit patternare formed by being insulated against each other; and the first circuit patternand the second circuit patternare respectively connected to the first external connection partand the second external connection partby a metal bonding.

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Tokyo, Japan

Atsushi Ezawa