Abstract: A piezoelectric resonator plate capable of excitation to thickness shear vibrations is provided on each of its large surfaces with a respective excitation electrode and is provided, at least in partial regions of its border, a thickness decreasing in the direction of the border of the plate in the form of a beveling, whereby in the region of such a border beveling, respectively, a connection member contacts one of the excitation electrodes.

Abstract: An H-type ceramic resonator having two resonating leaves, a connecting leaf for bridging the two resonating leaves to form an H-shape, and electrodes disposed on at least both surfaces of the resonating leaves. The resonator has a dimensional relationship which falls within the following equities:B.sub.2 /B.sub.3 =4 to 6,B.sub.1 /B.sub.3 =2 to 4, andL/B.sub.1 =5 to 6wherein L is a length of each of the resonating leaves, B.sub.1 is a width of each of the resonating leaves, B.sub.2 is a distance between the two resonating leaves, and B.sub.3 is a width of the connecting leaf.

Abstract: A generally flat, relatively thin AT-cut piezoelectric resonator element structured to minimize the force-frequency effect when mounted and energized in a housing. The resonator is in the form of an equilateral hexagon with the X crystallographic axis of the crystal passing through one set of opposing corners with mounting being effected at an adjacent set of corners respectively .+-.60.degree. away from the X axis which thereby results in a substantially zero frequency shift of the operating frequency.

Abstract: A resonator component module has circuitry contained in a dual-in-line package integrated circuit and a plate-shaped crystal resonator which is secured in place by upwardly bending opposite central leads of the dual-in-line package and forming the ends of the bent leads to receive and retain the plate. Appropriate other leads of the dual-in-line package are fixed to terminal pins held in a base plate to which external electrical connections are made. A protective cap is attached to the base plate to cover the integrated circuit and the resonator in a self-contained module.

Abstract: A crystal holder is provided which is capable of supporting any one of a plurality of piezoelectric crystals having different preselected diameters. The crystal holder includes two side portions, each portion having a stair step-like structure, the stair steps of one side portion leading upwardly and away from the stair steps of the remaining side portion. Each step of one side portion is respectively horizontally aligned with a corresponding step of the remaining side portion such that each step pair thus formed has a different distance therebetween and is thus capable of accepting for mounting one of a plurality of piezoelectric crystals having preselected diameters corresponding to the distances between the steps of the step pairs.

Abstract: A resonator mounting assembly wherein the resonator blank is mounted agai an essentially planar surface presented by a plurality of peripherally disposed mounting clips and bonded to this surface to provide substantially all the mechanical support for the blank in a direction normal to the major faces of the resonator blank, while being flexible in the directions parallel to said major faces so as to minimize radial stresses on the resonator blank, particularly during thermal cycling of the resonator assembly. The clips are fabricated of a low thermal expansion material, such as molybdenum, which also has considerable yield strength after exposure to processing temperatures; the bonding of the clips to the edges of the resonator blank can be achieved by a polyimide containing electrically conductive particles.

Abstract: A supporting structure for a thickness-shear type crystal oscillator for watches which has an excellent resistance to shocks, which is very compact in construction and which can support not only an annular crystal piece but also support a rectangular crystal piece is disclosed. The supporting structure comprises a supporting frame which is provided at its opposed inner periphery with tongues adapted to be engaged with corresponding notches provided on opposed end portions of a crystal piece, respectively.

Abstract: Piezoelectric resonator comprising a sealed box in which a vacuum has been formed or into which has been introduced a residual gas, within said box a piezoelectric crystal having first and second main opposite faces, a first metal electrode deposited on the first main face of the crystal and a second metal electrode deposited on the second main and opposite faces of the crystal, a first conductor connected to the first electrode and extending outside the box, a second conductor connected to the second electrode and extending outside the box and means for maintaining the crystal within the box, wherein the piezoelectric crystal comprises a central portion and a peripheral portion forming a ring which spacedly surrounds the central portion and connected to said central portion by an intermediate portion which over at least part of the distance between the central portion and the peripheral portion has a reduced thickness compared with the thickness of said central and peripheral portions wherein the first and s

Abstract: A piezoelectric resonator assembly comprises a single integral plate which is cut to form a peripheral region for supporting a resonator, a central resonating region for resonating in the longitudinal mode, surface-shear mode, or bending mode, and at least two oppositely positioned arms for fastening the peripheral region to the central region at opposite points on the central resonating region. The arms are positioned at nodal zones of the central resonating region. There is a single gap between the peripheral region and the central resonating region at each position about the central resonating region except at the positions of the arms. The entire upper and lower surfaces of the plate are continuous and have metal plates formed thereon for forming the excitation electrodes of the central resonating region. The metallized plates are attached to leads at the peripheral region.

Abstract: An oscillator case assembly includes a casing element and an oscillator element housed therein in a hermetically sealed manner. The casing element is made of a solid insulating material, preferably glass or ceramic material, and at least two thin conductive layer elements are provided on said casing element, each serving as parts of lead-in and lead-out means for the oscillator element, respectively.

Abstract: A piezoelectric resonator element having supporting lead members projecting in opposite directions therefrom is positioned in a tubular dielectric case having tubular metal cap members affixed at opposite ends thereof and extruding beyond the ends of the case. Inner end portions of the cap members are hermetically sealed to the case. Intermediate portions of the cap members beyond the ends of the case are compressed onto end portions of the lead members to secure the resonator element in position in the case and to make electrical contact between the lead members and the metal cap members. End portions of the cap members beyond the ends of the lead members are compressed to seal the case, the sealing being effected in a vacuum so as to evacuate the interior of the case. In order further to seal the case, the outer ends of the cap members may be welded or soldered.

Abstract: Piezoelectric microresonators with suspension arms, oscillating according to a vibration resulting from the superposition of a principal extensional mode of oscillation, of a first shear coupled mode of oscillation and of a second extensional coupled mode of oscillation. The suspension arms are attached to the active part of the resonator in a place which is the intersection of a nodal plane of the vibration resulting of the superposition of the principal mode and of the first coupled mode of oscillation. The other end of the arms is fixed on a stiff support in a location which coincide with a node of their vibration.

Abstract: A piezoelectric crystal is held in the slots of two flat spring sheetmetal members with small flaps of the spring being bent out of the slots lying against the bevelled edges of the crystal to improve shock resistance. Additionally the flaps can be fastened to the crystal by using an elastic material.

Abstract: This disclosure relates to improved piezoelectric quartz crystal products preferably used in quartz crystal filter and resonator applications, and fabrication methods therefor. Various embodiments are disclosed including a substantially circular, a square, and a rectangular quartz crystal product wherein each one contains a single triangular shaped electrode located on each of the two sides thereof in an overlapping arrangement. Other embodiments disclosed include a substantially circular, a square, and a rectangular quartz crystal product wherein each one contains multiple electrodes such as two spaced apart triangular shaped electrodes located on each side of the two sides thereof in an overlapping arrangement.

Abstract: A thickness shear resonator used as an overtone quartz crystal for a quartz stabilized oscillator which has an operating frequency in the MHz range that has an excitation electrode on each of its plane parallel surfaces running in the x, z' plane and where the thickness of the vibrator in the y' direction is determined by the distance of these surfaces from one another wherein the vibrator presents a dimensional ratio between its dimensions measured in the z' direction and its thickness which is determined by a fundamental quartz crystal frequency having a value of 1/3 of the operating frequency, thus, resulting in an oscillator which is not sensitive to influences from associated oscillating components.

Abstract: A piezoelectric vibrator unit has a substantially flat holder case which is provided on one side with a recess or recesses each encasing a piezoelectric vibrator plate. The bottom wall of each recess is provided therethrough with a port or ports each at a position which corresponds to an excitation electrode formed on the vibrator plate. Another side of the holder case is used for masking means for forming, for the micro-adjustment of vibration frequency, a vacuum evaporated film on the excitation electrode.