Abstract: In a surface acoustic wave resonator in which an interdigital transducer is formed on a piezoelectric substrate with apodization based on cross lengths of electrode fingers and the inside face of each bus bar is not parallel to a group velocity direction of a surface acoustic wave excited on the interdigital transducer, reflector electrode fingers and excitation-area electrode fingers are disposed to provide relatively shifted positioning therebetween in the group velocity direction of the surface acoustic wave or a distance between the periphery of an excitation area and the inside face of each bus bar is limited within a predetermined range.

Abstract: In a surface acoustic wave resonator in which an interdigital transducer is formed on a piezoelectric substrate with apodization based on cross lengths of electrode fingers and the inside face of each bus bar is not parallel to a group velocity direction of a surface acoustic wave excited on the interdigital transducer, reflector electrode fingers and excitation-area electrode fingers are disposed to provide relatively shifted positioning therebetween in the group velocity direction of the surface acoustic wave or a distance between the periphery of an excitation area and the inside face of each bus bar is limited within a predetermined range.

Abstract: A surface acoustic wave device which includes a piezoelectric substrate, and an interdigital transducer formed on a planar surface of the piezoelectric substrate, and having first and second bus bars, a first plurality of electrode fingers connected to the first bus bar, and a second plurality of electrode fingers connected to the second bus bar. The first and second plurality of electrode fingers of the interdigital transducer have an electrode cross region in which the first and second plurality of electrode fingers are arranged alternatively. Each boundary between the first and second bus bars and a grating region of the first and second plurality of electrode fingers is arranged such that the boundary is not substantially parallel, with a transmission direction of surface acoustic waves excited by the interdigital transducer.

Abstract: A high frequency module is disclosed which comprises a high frequency device in a package, a circuit formed on a flexible substrate in the package, the circuit, the high frequency device and input/output terminals of the package being connected electrically.

Abstract: A SAW resonator includes resonating SAW transducer units formed on a piezoelectric substrate and juxtaposed in a direction of propagation of acoustic waves, and a unidirectionally reflecting SAW transducer unit provided in each end of the juxtaposed resonating SAW transducer units on the substrate. Each resonating SAW transducer unit includes first and second SAW transducers connected in series and/or in parallel with each other.

Abstract: A surface acoustic wave device has its inter--digital transducers made of a 3--metal alloyed material consisting of aluminum, copper and magnesium.

Abstract: In order to reduce the size of a duplex radio communication transceiver such as a mobile telephone, this transceiver is constructed of a transmitting and receiving duplexer, a filter to be coupled to the duplexer, an amplifier for amplifying a signal received, and a filter to be connected with the output of the amplifier. All the filters are made of acoustic surface wave filters, and all the circuits are mounted on a single metallic substrate and sealed by means of a metallic casing into a module. The transceiver thus constructed has a volume which is one tenth as small as that of the device of the same kind according to the prior art.

Abstract: In order to realize an SAW filter withstanding high power, a plurality of single open-ended surface acoustic wave resonators are connected in series, and an earth conductor is disposed at least on a part of rear face of a piezoelectric substrate constituting the surface acoustic wave resonators. And static capacities formed between said earth conductor and electrode conductors on the piezoelectric substrate constituting the surface acoustic wave resonators are utilized as constituents of the filter circuit. In the above described structure, a part of input power is not converted into acoustic energy, but directly transmitted to the output side. Since the mechanical stress imposed upon the electrode material and the piezoelectric substrate is thus lightened, the SAW filter can withstand a large power signal.

Abstract: A method of driving a gas-discharge panel having at least one reset electrode and cathode and anode groups for forming N electrode pairs. The cathodes are p-phase connected (p.gtoreq.3) while the anodes are m-phase connected (m.ltoreq.p). The reset electrode is applied with a reset pulse voltage having a period of T of one frame. Cathode pulse voltages having their pulse widths of (p-1)T/N are successively applied to the cathodes for respective p phases with a phase shift of T/N to each other while anode pulse voltages having their pulse widths of at maximum (m-1)T/N are successively applied to the anodes for respective m phases with a phase shift of T/N to each other. A reset discharge which is generated by the reset pulse voltage and the first one of the cathode pulse voltages and anode pulse voltages applied for each frame and having a value cooperating with the reset pulse voltage value is successively transferred by means of the cathode and anode voltages to display desired information.

Abstract: A gas discharge display device comprising alternately disposed anodes and cathodes, wherein the anodes and the cathodes are interconnected respectively in multi-phase connections whereby a bar-graph display can be effected by means of a self-scanning function.

Abstract: A display device wherein a plurality of discharge cells exploiting the d.c. discharge and having the memory function are separated into a group of cells to be used only for the transfer of discharge and a group of cells to be used for the transfer of discharge and for the display of characters etc., and wherein the self-transfer of discharge is done while the discharge is shifting zigzag among the cells of both the groups.

Abstract: A method for forming flat display panel phosphor dots is disclosed wherein a conventional printing method or procedure is used in combination with an optical method.The paste film containing the phosphor, photoresist and powdered glass is coated on the surface of the dielectric layer, e.g. lead glass layer by means of the printing method. The paste layer is irradiated by a ultraviolet light through a mask, and after the development of the paste layer has been completed, the remaining hardened portions of the paste layer are subjected to a heat treatment. In this way, phosphor dots having a desired shape can be formed very firmly and very exactly at certain predetermined portions on said dielectric layer.