Abstract: A thin quartz oscillator element including a substrate of quartz with a plurality of electrodes disposed on a major surface of the substrate and extending outwardly beyond one edge of the substrate. Metallic bodies are disposed on the same surface of the substrate as the electrodes remote from the electrodes. The electrodes thicken in the region that extends beyond the edge of the substrate to a sufficient thickness to be thereby reinforced. Another electrode made as a metallic layer is built-up on the opposite major surface of the quartz substrate. To construct the quartz oscillator, an upper and a lower major surface of a quartz substrate are lapped. The substrate is mounted on a jig, and a metallic layer is deposited on a surface of the substrate and extending from one end thereof. The metallic layer is coated with photo-resist, the photo-resist is exposed to light through a mask, and the photoresist is then developed to remove unexposed photo-resist.

Abstract: An acoustic surface wave transducer characterized by a novel electrode coguration. A pair of electrode strips are positioned on the surface of a piezoelectric material, each of the strips having elongate fingers extending laterally towards one another. The fingers from the opposed electrode strips are aligned with one another, as opposed to the common interdigitated structure of the prior art. The fingers have a prescribed spacing from adjacent fingers as well as from opposed fingers. The prescribed configuration causes the electric field between corresponding fingers to peak at the points between the ends of the fingers which, in turn, causes high shear stresses to occur and be reinforced as the acoustic wave travels down the length of the material. The basic transducer generates a point source of acoustic waves.

Abstract: Disclosed is a surface wave device comprising one transducer having its fundamental resonant frequency at a subharmonic of the device operating frequency and a second transducer having its fundamental resonant frequency at the device operating frequency. Both transducers respond to surface waves at the operating frequency. Only the harmonic operated transducer responds to bulk waves at the operating frequency. Thus, signal coupled from one transducer to the other at the operating frequency contains no noise generated by bulk mode coupling.

Abstract: An interdigital transducer used in an elastic surface wave device and including a pair of electrodes each having a common electrode and a plurality of electrode fingers connected to the common electrode, the overlap lengths of electrode fingers being uniform throughout the transducer. Floating electrodes, each having two parallel conductors connected together at one end, are disposed between the interdigital electrode fingers of the paired electrodes to weight the excitation electric field strength.This invention relates to an elastic surface wave transducer.BACKGROUND OF THE INVENTIONAn elastic surface wave device (also referred to as an acoustic surface wave device) used in the VHF band and UHF band as a filter or delay line already known to those skilled in the art. An elastic surface wave device has transmitting and receiving interdigital transducers disposed on a piezoelectric substrate. These transducers are used to convert electrical signals into elastic surface waves or vice versa.

Abstract: Apparatus and method for phase-encoding electro-acoustic electro-acoustic elements, elements of an acoustic surface wave device to provide preselected transducer characteristics. By altering the position of a transducer element or portions of a transducer element, the phase of the acoustic wave propagated from, or the phase of the electrical signal received by the transducer element can be varied by an amount determined by the velocity of propagation of the acoustic wave.By altering the location of the electro-elements, or portions thereof, from a position determined for example by amplitude-encoding techniques, a resultant signal produced by a plurality of electro-acoustic elements, element portions, or combination of elements and element portions can provide the preselected transducer characteristics.

Abstract: Surface acoustic waves on a piezoelectric crystal substrate beat with the bulk shear wave energy generated by the incident surface wave and which pass through the thickness of the substrate to produce a beat signal which is collected and is useful in pulse systems.