JPH03191607A - Thickness slip crystal resonator - Google Patents

Abstract

PURPOSE:To microminiaturize and thin the crystal resonator, to make the resonance leakage extremely small, to reduce an equivalent series resistance, and also, to enhance the Q value by providing a bridge part on a vibration part and connecting it through a frame, and providing a projecting part in the center part of the frame. CONSTITUTION:A resonator 1 is constituted of a resonating part 2, four bridge parts 3, two pieces of frames 4 and two pieces of projecting parts 5. Also, on the upper and the lower faces of the part 2, an excitation electrode 6 and 7 are placed, and by applying an alternating voltage between both the electrodes, thickness slip resonance can be caused. Subsequently, in four corners or the part 2, the part 3 is provided, respectively, the part extended in the same direction is connected through the frame 4, and also, in the center part of the frame 4, a projecting part 5 is provided. Accordingly, energy of the part 2 is not transmitted at all to the part 5, therefore, even if it is supported and fixed by the part 5, a satisfactory characteristic is obtained without causing the deterioration of an equivalent series resistance R1. In such a way, sprious resonance is suppressed, there is no resonance leakage, the equivalent series resistance R1 becomes smaller, a high Q value is obtained, and also, the crystal resonator is miniaturized and thinned with its shock resistance improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to the shape of a thickness shear crystal resonator in which a vibrating part and a supporting part are integrally formed by an etching method. In particular, the present invention relates to a thickness-slip crystal oscillator that is optimal as a reference signal source for portable devices such as IC cards, pagers, and mobile radios, which have strong demands for ultra-thin and compact design.

[Summary of the Invention] An object of the present invention is to provide a thickness-shear crystal resonator that is ultra-compact, thin, has very little vibration leakage, has a small equivalent series resistance R0, and has a high Q value. In order to achieve this, a support part consisting of a vibrating part, a bridge part, a frame and a protruding part is chemically formed integrally by an etching method. By forming the vibrator in this manner, the object of the present invention is achieved.

[Conventional technology]

Conventional thickness-shear crystal oscillators are generally machined and have a disk or strip shape. The disk-shaped support has a certain angle with the vibration direction, while the strip-shaped support is supported and fixed by two support lines in the same direction as the vibration direction.

[Problems to be solved by the invention] Since the conventional disc shape is a disc, it is relatively easy to support it, but because it is a disc, it is difficult to miniaturize it.On the other hand, the conventional rectangular shape In this case, it is possible to reduce the width of the vibrator, but since it is supported and fixed in the length direction, there is a limit to miniaturization of the vibrator due to the support method.

[Means for Solving the Problems 1] In view of the above, the present invention solves the shortcomings of the conventional method by the following method. In other words, it is a thickness-shear crystal resonator in which the vibrating part and the supporting part are integrally formed using the etching method.
Bridge parts are provided at each of the four corners of the vibrating part, the bridge parts provided in the same direction are connected via a frame, and the vibrator is constructed in a shape with a protruding part provided in the center of the frame. This achieves the objectives of the invention.

[Function] As described above, the thickness shear crystal resonator of the present invention has a vibrating part,
It consists of a bridge part, a frame and a protruding part. Since it is supported and fixed to lead wires or a pedestal by the protrusions provided on both ends, it is ultra-compact, thin, has excellent impact resistance, and has a high Q value with a small series resistance R. It is possible to obtain an inexpensive thickness-shear crystal resonator having the following characteristics.

[Examples] Next, the present invention will be specifically described based on Examples. 1st
The figures show a plan view (A) and a side view (B) of an example of the thickness-shear crystal resonator shape and excitation electrode arrangement of the present invention.The resonator l has 2 vibrating parts, 4 bridge parts 3, and 2 It consists of a frame 4 and two protrusions 5, which are integrally formed by etching. In addition, excitation electrodes 6 and 7 are arranged on the upper and lower surfaces of the vibrating part 2, and by applying an alternating voltage between the two electrodes, thickness shear vibration can be caused. Bridge parts 3 are provided at each of the four corners of the vibrating part 2, and the bridge parts 3 extending in the same direction are connected via a frame 4. Further, the frame 4 has a structure in which a protrusion 5 is provided at the center. Therefore, the energy of the vibrating part 2 is not transmitted to the protruding part 5 at all, so the protruding part 5
Even if the resistor R3 is supported and fixed, good characteristics can be obtained without causing deterioration of the equal series resistor R3.

[Effects of the Invention 1 As described above, the present invention achieves the following remarkable effects by proposing a thickness-shear crystal resonator with a new shape in which the vibrating part, bridge part, frame, and protrusion are integrally formed by an etching method. have

■ Since bridge parts are provided at the four corners and two of each are connected to the frame, contour slip mode can be suppressed and spurious vibrations can be suppressed.

■ By additionally connecting the supporting part consisting of the bridge part, frame and protruding part to the vibrating part, a thickness-slip crystal resonator with no vibration leakage, low equal series resistance R1, and high Q value can be obtained. .

(2) At the same time, since the vibrator is formed by an etching method, it can be made smaller and thinner.

■ Since it is supported and fixed at both ends, it has excellent impact resistance.

[Brief explanation of drawings]

FIGS. 1A and 1B are a plan view (A) and a top view (B) of an embodiment of the thickness-shear crystal resonator shape and excitation electrode arrangement according to the present invention.・Vibrator, vibrating part, bridge part, frame, protruding part, excitation electrode and above

Claims (1)

[Claims] This is a thickness-slide crystal resonator in which a vibrating part and a support part are integrally formed by an etching method, and bridge parts are provided at each of the four corners of the vibrating part, and the bridge parts provided in the same direction are connected via a frame, A thickness shear crystal resonator characterized in that a protrusion is provided in the center of the frame.