Matsushita Electric Industrial Co., Ltd.

Nozomu Ueshiba

Yukihiko Ise

Ryoichi Takayama

Akira Tokushima

Tetsuji Fukada

Takashi Wakabayashi

Hiroshi Suzuki

Hiroshi Mitake

S/N characteristic and durability of recording medium e.g. video tape or magnetic disket are improved by using as bonding resin used in the magnetic paint to make the magnetic layer a polyester-based polyurethane having a number average molecular weight of 5,000-100,000 and containing at least two hydroxyl group and at least one sulfone bond therein, through improvement of dispersibility of fine magnetic powder in the magnetic paint.

Magnetic recording medium

A fine adjustment apparatus for an optical system lens includes an annular laminated piezoelectric vibrator. The lens is attached to the inner peripheral portion of the piezoelectric vibrator. The piezoelectric vibrator is firmly supported at its outer peripheral portion by a proper member. The piezoelectric vibrator is deflected by the application of a voltage, whereby the lens is finely displaced in the optical axis direction thereof. The piezoelectric vibrator may be formed by laminating two annular piezoelectric elements with an annular metal plate sandwiched therebetween. Each of the piezoelectric elements has the axis of polarization extending in the thicknesswise direction thereof. The metal plate has a thickness which does not exceed at least 25% of the total thickness of the two piezoelectric elements.

Fine adjustment apparatus for optical system lens

An ultrasonic transducer having, in a throat part of a horn, a piezoelectric element and a diaphragm connected by a connection rod to the piezoelectric element. A disk having a plurality of apertures is disposed in front of the diaphragm, thereby improving the directivity and sensitivity without losing transient characteristic, making the transducer very suitable for ultrasonic distance measurement in air.

Ultrasonic transducer with a piezoelectric element

An ultrasonic transducer comprises a lamination structured piezo-electric element (1) to which center shaft (2) of a diaphragm (3) is connected, a housing (7) mounted integral with a horn (11), a buffer member (10) disposed between said housing (7) and said diaphragm (3) for holding said diaphragm (3) in vibratable manner; thereby a sharp rise up and fall down characteristics of ultrasonic wave and sharp directivity are attained.

Growing community of inventors

Hirakata, Japan

Nozomu Ueshiba