Matsushita Electric Industrial Co., Ltd.

Matsushita Electrical Industrial Co., Ltd.

Hiroshi Yoneno

Masanori Sumihara

Yoshinobu Imasaka

Shoichi Ishihara

Yoshihiro Matsuo

Takahiro Wada

Ryoichi Yamamoto

Fumiko Yokotani

Akira Tokushima

Akira Inami

Provided herein is an ultrasonic motor in which at least fluorocarbon polymer is present on the contact surface of at least either of the rotor or the stator. Since the fluorocarbon polymer provides a smooth contact surface, the ultrasonic motor generates no noise and produces a stable starting torque and holding torque. In addition, it has a long life with a minimum of wear.

Ultrasonic motor

Provided herein is an ultrasonic motor in which at least fluorocarbon polymer is present on the contact surface of at least either of the rotor of the stator. Since the fluorocarbon polymer provides a smooth contact surface, the ultrasonic motor generates no noise and produces a stable starting torque and holding torque. In addition, it has a long life with a minimum of wear.

In an ultrasonic motor using a friction member having arrangements of reinforcing fibers between an driven member to be driven and a vibrating stator for generating travelling waves by the vibration of a piezoelectric element, the arrangements of the fibers are oriented in at least a predetermined direciton, such as parallel to the moving direction of the driven member.

In an ultrasonic motor using a friction member having arrangements of reinforcing fibers between an driven member to be driven and a vibrating stator for generating travelling waves by the vibration of a piezoelectric element, the arrangements of the fibers are oriented in at least a predetermined direction parallel or vertical to the moving direction such as of the driven member.

A contacting member of a composite material of organic fiber and resin is provided to an inner surface of either a rotor or a stator of an ultrasonic motor. Noise is suppressed, starting torque is better and wear is decreased.

A heat storage material comprising a system consisting of sodium acetate and water incorporated with a fluorine ion-containing salt which is in solid state at the crystallizing temperature of sodium acetate trihydrate, as a nucleating agent for sodium acetate trihydrate.

Heat storage material

A heat insulator comprises a vacuum-filled pliable container containing a mass of flaky pearlite particles. The flaky pearlite particles have a thickness not greater than 0.5 micrometer and an average particle size not greater than 100 micrometers.

Heat insulator

The disclosure is directed to a composite thermal insulator including a Freon gas expanded plastic, and an evacuated powder insulation. The present invention provides a composite thermal insulator light in weight and having a superior heat insulating performance over a long period through replacement of a thick metallic container conventionally used for the evacuated powder insulation and considered indispensable for withstanding a load at one atmospheric pressure and for preventing vacuum leakage, by a film-like plastic container, with activated carbon disposed in it. More specifically, the composite thermal insulator of the present invention includes a Freon gas expanded plastic, a film-like plastic container evacuated to form a vacuum in its interior, and directly contacting and/or covered by the expanded plastic, and activated carbon or inorganic powder containing activated carbon tightly enclosed in the plastic container, light in weight, having a heat conductivity lower than 0.01 kcal/mh.degree.C. and a mechanical strength sufficient for actual use, with almost no variations with time in the heat insulating property.

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Shiki, Japan

Hiroshi Yoneno