Murata Manufacturing Co., Ltd.

Yutaka Murai

Takeshi Nakamura

Takayuki Kaneko

Takao Mouri

Akira Kumada

A transformer includes a bobbin having a cavity, a primary winding wound around the bobbin, and a secondary winding wound around the bobbin and magnetically coupled with the primary winding. In the transformer, at least one of the primary winding and the secondary winding is divided into at least two portions which include a portion wound at an inside region of the transformer and a portion wound at an outside region of the transformer. Also, at least a portion of the other one of the primary winding and the secondary winding is wound between said at least two portions obtained by dividing the one of the primary winding and the secondary winding, and at least a portion of the cavity of the bobbin is used as a space to dispose another member therein.

Transformer, loudspeaker device, loudspeaker network, and loudspeaker system

A speaker includes a disk-shaped base. A substantially hemispherical surface vibrator is fitted into a substantially circular groove formed in the base to be bonded therein. Terminals are attached to electrodes located on both surfaces of the vibrator. The edge portion of the vibrator is bonded with a first adhesive, and further, its circumference is bonded with a second adhesive. The first adhesive has a sufficient bonding strength between the vibrator and the base. The second adhesive has a lower elastic modulus than the first adhesive.

Speaker

A speaker includes a disk-shaped base. A substantially hemispherical surface vibrator is fitted into a substantially circular groove provided in the base and bonded therein. Terminals are attached to electrodes provided on both surfaces of the vibrator. The terminals, passing through the terminal grooves provided in the base, are led out in a direction that is substantially perpendicular to the plane of the base. Further, a horn as a separate member may be attached to the outer surface side of the vibrator.

Speaker having a hemispherical vibrator

A vibrating gyroscope 10 includes a vibrator 12 which has a regular triangular prism-shaped vibrating body 14 and piezoelectric elements 16a, 16b and 16c formed on side faces of the vibrating body 14. The piezoelectric elements 16a, 16b and 16c having approximately same temperature characteristics are used. An oscillation circuit 26 is connected between the piezoelectric elements 16a, 16b and the piezoelectric element 16c. The piezoelectric elements 16a and 16b are connected to a differential amplifying circuit 28, and the differential amplifying circuit 28 is connected to a detecting circuit 30. An output signal of the piezoelectric element 16c for feedback is half-wave rectified by a half-wave rectification circuit 32, and smoothed by a smoothing circuit 34. An output signal of the smoothing circuit 34 is supplied to an automatic gain control circuit 36, and a gain of the detecting circuit 30 is controlled according to the input signal of the automatic gain control circuit 36.

Growing community of inventors

Nagaokakyo, Japan

Yutaka Murai