Hitachi, Ltd.

Nisshin Steel Co., Ltd.

Hitachi Denshi Kabushiki Kaisha

Semiconductor Research Foundation

Hitachi Electronics, Ltd.

Takeo Seki

Akio Kumada

Katsuhiko Ishida

Jun-ichi Nishizawa

Ichiemon Sasaki

Takeshi Nishimura

Itsuji Maeda

Yukio Shinoda

Syoji Tauchi

Noboru Kozuma

A piezo-electric bimorph type transducer of a cantilever type for controlling the scan tracking of a magnetic tape by a rotating head in a helical-scan-type video tape recorder. In this transducer, piezo-electric thin plates which constitute a piezo-electric bimorph are formed in a different shape from the electrodes attached to the piezo-electric thin plates, and the width of the electrodes is smaller than the width of the piezo-electric thin plates in the direction from a fixed end of the transducer toward a movable end of the same, whereby in the bimorph element, a predetermined relationship is attained between the bending moment produced by a control voltage applied to the electrodes and the innertia generated in a dynamic condition, and the displacement of the magnetic head caused by the piezo-electric bimorph type transducer is in static and dynamic conformity, so that the tracking control is correctly carried out.

Piezo-electric bimorph type transducer

A method and apparatus for detecting a flaw, color shading, or the like on the surface of a running object and for producing an electrical signal in response thereto by optically scanning such surface, characterized in that there is provided not only a photoelectric element for receiving the component of light regularly reflected from the surface of the running object, but also means for receiving the component of light irregularly reflected from the surface thereof, thereby to detect all of the defects that may exist on the surface of such object regardless of the surface finish.

Method and apparatus for detecting defects in a surface regardless of

Signal collecting and distributing systems wherein an active transmission line possessing neuristor characteristics is provided as a means for scanning a plurality of signal transducers, which may be in the form of radiation sensitive elements or electroluminescent elements, respectively, to effect actuation thereof in a prescribed order.

Signal collecting and distributing systems

Growing community of inventors

Kokubunji, Japan

Takeo Seki