Abstract: A surface acoustic wave resonator includes a base plate made of glass and a layer of piezoelectric material which has a plurality of strips extending parallel to each other for forming a reflector. A surface acoustic wave excited from a transducer reflects at each of the strips. The reflectance of such surface acoustic wave is improved by the arrangement of the strips and the thickness of the layer. On the other hand, the temperature coefficient of the resonance frequency is also improved by the arrangement of the strips and the thickness of the layer, and by the amount of the alkali metal oxide contained in the base plate, and further by the thickness of silicon oxide film laminated on the surface of the base plate.

Abstract: An alumina body having a conductive coating with a smooth surface, is made up of a conductive layer and a cementing layer sandwiched between the conductive layer and the surface of the alumina. The thus coated alumina body can advantageously be used e.g. for a pickup stylus for a video disc playback system of the capacitance variation type.

Abstract: This invention provides a multi-layered substrate for a surface-acoustic-wave device which substrate comprises a piezoelectric layer on a base, the temperature coefficient of a phase velocity of the surface-acoustic-wave in the piezoelectric layer being different from that of the base, the piezoelectric layer having a thickness less than a wavelength of the SAW. This multi-layered substrate can have a large electromechanical coupling and controlled temperature coefficient of the phase velocity.

Abstract: A resistive film composition consisting essentially of AlN and solid solution of TiN and ZrN and a method of making the same by means of cathodic sputtering.

Abstract: A crystal film such as a piezoelectric crystal film is formed by sputtering of source material which is in the form of a convex curved surface or a polyhedral surface, and the formed film has crystallographic properties which can be very well controlled.

Abstract: An electrooptic storage device having a transparent, ferroelectric ceramic plate, one pair of writing electrodes on opposite surfaces of the ferroelectric ceramic plate, respectively, and one pair of erasing electrodes on opposite edges, respectively of the ferroelectric ceramic plate, the writing electrodes each being a thermally sensitive transparent resistor layer. This device is a device capable of reversible image storage.