JPS59181713A - Supporting structure of rectangular thickness shear vibrator - Google Patents

Abstract

PURPOSE:To inhibit an increase of a CI value, a drop of a Q value and a drop of a supporting strength, etc., and to install automatically a microsupporting structure to a substrate, by providing a pair of supporting bases at a right angle on a base of a vessel, forming a recessed part on said supporting base, inserting both end parts in the longitudinal direction of a vibrator into this recessed part, and supporting them. CONSTITUTION:A supporting structure of a vibrator is obtained by providing a pair of supporting bases 18 extending at a right angle on a base 20 of a vessel for containing a vibrator 14, forming a recessed part 19 extending in parallel to said base 20, on each opposed surface of said supporting base 18, inserting the end part in the longitudinal direction of the vibrator 14 into the recessed part 19, and sticking it. In this case, even if the quantity of application of a conductive adhesive agent used for supporting is not much, resistance to shock is not deteriorated, and also since a small supporting area is enough, such problems as an increase of a CI value and a drop of a Q value, etc. can be inhibited. Also, this supporting structure has no lead wire, and a shape of the vessel is a rectangular parallelepiped, therefore, it is very advantageous for installing it automatically to a substrate, etc.

Description

[Detailed description of the invention] related.

In recent years, with the increasing density of electronic devices, many of the electronic components are becoming smaller and of higher quality, and the thickness-shear oscillators used as signal sources in such devices are There is a strong demand for smaller and higher quality products. In addition, 1) In order to reduce the cost of IJ equipment, etc., automated systems are being introduced for mounting electronic components on boards. Therefore, it is desired that electronic components have a simple shape that is easy to install. However, the quality of thickness shear vibration-r currently available on the market is ii:6.
Although it is added, the magnitude of the vibration A is considerably larger than that of other electric parts, and the shape has a conductive leat, so it is not suitable for automatic mounting on a board. is the current situation.

In order to further reduce the size of the thickness-shear vibrator and simplify its external shape, it is more advantageous to use a rectangular type than the disk-shaped type that is currently mass-produced. However, because
In order to perform pure thickness-shear vibration using a thickness-shear resonator, the dimensions of the main surface must be sufficiently wide compared to the thickness of the resonator. There is a high possibility that a thickness-shear oscillator with a rectangular shape that cannot be used will not be able to achieve the original performance of a thickness-shear oscillator.

In the case of a thickness-shear resonator, in addition to the thickness-shear vibration, which is the main vibration, many spurious waves are observed to occur. In the case of a rectangular thickness-shear oscillator, it is confirmed that the occurrence of spurious noise due to the contour oscillation is more significant than that of a disc-shaped one, and that there are even more spurious waves as the oscillator is made smaller. If the following spurious components exist near the main vibration, problems such as an increase in the crystal impedance value (hereinafter referred to as CI value), a decrease in the Q value, and a discontinuous no-yamp in the frequency and CI temperature characteristics may occur. Therefore, the performance of the rectangular thickness-shear oscillator is adversely affected. Therefore, in order to avoid the spurious generated in the vicinity of the main vibration due to the outline size and miniaturization far from the main vibration, it is necessary to select an appropriate outline size. In addition, we have proposed a method for confining the vibration energy of thickness shear vibration in the central part of a rectangular thickness shear vibrator and reducing as much as possible the leakage of vibration energy to the supporting parts provided at the longitudinal ends of the vibrator. need to be developed. As mentioned above, many problems related to rotation have been identified in the development of rectangular thickness-shear oscillators, or recently, research and development has progressed and ultra-thickness shear oscillators have been developed with good characteristics that can be put to practical use. A small rectangular thickness-shear oscillator has been developed. However, the current rectangular thickness-shear vibrator has many problems in terms of mass productivity, external appearance, etc. of the vibrator.

FIG. 1 is a perspective view of the first conventional example, in which (1) is a rectangular thickness-shear oscillator, (2) is an excitation main electrode, (3) is a conductive adhesive, and (4) is a lead wire. 1. Support member that also serves as a wire, (
5) is an airtight terminal, which is represented by a dotted line in the figure (6)
) is a cylindrical sealed tube. ” 1. The support structure of the conventional example is
Conductive adhesive (
3) was used to support and fix. ``The point that must be taken into account in the support structure described in item 1 is the amount of conductive adhesive used. If the amount of the adhesive used to support the vibrator (1) is too large, the adhesive may be used to support the vibrator (1).
CI
This results in an increase in the Q value and a decrease in the Q value. If the amount is too small, the support strength of the vibrator (1) will be reduced, resulting in peeling of the support portion due to drop impact or the like. Further, the conventional example is not suitable for automatic attachment to a board because of its cylindrical external appearance and the use of a support member (4) that also serves as a lead wire.

FIG. 2 is a perspective view of the second conventional example, in which (7) is a rectangular thickness shear vibrator, (8) is the main electrode for excitation, (9) beam 1/piezo electrode, and (10) is a conductive (11) is a support, (12) is a base, and (13), indicated by a dotted line in the figure, is the top lid of the container. The external shape of this conventional example is a simple rectangular parallelepiped, and the IJ-
Since it has no curved edges and is provided with a lead electrode pattern (9), it is suitable for automatic attachment to a board. However, in the support structure of this conventional example, a conductive adhesive (10) is applied to the second part of the support member (1), and then the rectangular thickness shear vibrator (7) is placed on the support member (11) and supported. For fixation, the support part jA' of the rectangular thickness shear vibrator (7)
(11) It is difficult to achieve positional accuracy when installing on J2. Further, since the support structure uses a support member (11), the area used for support becomes large, and vibration energy due to thickness shear leaks to the support portion, resulting in an increase in the CI value and a decrease in the Q value.

Therefore, in view of the above-mentioned drawbacks of the conventional examples, the present invention aims to provide a thickness-shear vibrator that is ultra-compact, high-quality, and excellent in mass production and automatic attachment to a substrate.

FIG. 3 shows an embodiment of the present invention,
(a) is a perspective view, (l) is a front view, (C1 is an A-A' cross-sectional view of fbl. In the figure, (14) is a rectangular thickness-shear oscillator, and (15) is a rectangular thickness-shear oscillator. Main electrode for excitation, (1
6) is a lead electrode, (17)- is a conductive adhesive, (]
8) is a support base, (19) is a recess, (20) is a base, and (21) represented by a dotted line is a -1-bump of the container.

FIG. 4 shows another embodiment of the present invention; (a) is a front view, fbl is a cross-sectional view of ta+ no. 13-B', and (C) is c-c' of (a). There is a lack of cross-sectional views.

In the figure, c21) is the main electrode for excitation, (22) is the Li-1/piezo electrode, C23) is the support base, (24) is the recess, and (25) is the conductive adhesive.

In the case of a rectangular thickness-shear oscillator, its vibration state is thickness-shear vibration, and in order to maintain the good characteristics inherent to a thickness-shear oscillator, special care must be taken with the support position and area of the rectangular thickness-shear oscillator. It is necessary to. In general, as a support structure for maintaining good characteristics of the vibrator, the shorter the length from the longitudinal end of the vibrator to the center of the vibrator, the better the support position, and the smaller the supporting area. It is said to be in good condition. However, in the support structure for maintaining good characteristics of the vibrator, there is a high possibility that the impact resistance will be impaired. Therefore, the support structure of the rectangular thickness-shear oscillator must take into consideration impact resistance and characteristics. Therefore, in order to solve the following two problems, the support structure for the rectangular thickness shear vibrator of the present invention is designed to provide a support structure for the rectangular thickness shear vibrator of the present invention, such as the base (20) of the container housing the vibrator (j4).
A pair of support stands (18) extending substantially perpendicularly upward is provided, a recess (19) extending substantially parallel to the base (20) is formed on opposing surfaces of the support stand (18), Vibrator (14
) is inserted into the recess (19) and fixed therein.

The shape of the recess described above has an rlJ that allows insertion of the longitudinal end of the rectangular thickness-shear oscillator, and the depth of the recess is 1/8 or less of the longitudinal dimension of the oscillator. It is desirable to do so. As described above, even if the amount of applied conductive adhesive used for support is not as large as in the first and second conventional examples, the impact resistance will not be deteriorated, and the supporting area is smaller than in the first and second conventional examples. Since it is sufficient that the amount is smaller than in the case of the example, it is possible to suppress problems such as an increase in the zero value and an increase in the Q value due to support, which have been problems in the past. Further, unlike the first conventional example, the present invention does not have a lead wire, and the container has a rectangular parallelepiped shape, which is very advantageous for automatic attachment to a substrate or the like.

As explained below (according to the support structure of the rectangular thickness shear oscillator according to the present invention), the CI value of the hole size and Q caused by the excessive amount of applied conductive adhesive, which has been a problem in the past, can be reduced.
Not only is it possible to prevent the drop in value and support strength, but also the external shape of the container for the vibrator can be greatly simplified, making it possible to automatically attach it to the ultra-compact board. It is possible to mass produce rectangular thickness shear vibrations.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a first conventional example. FIG. 2 is a perspective view of a second conventional example. FIG. 3 shows an embodiment of the present invention, (al is a perspective view, (bl is a front view, and (C) is A of tb+.
-A' sectional view. FIG. 4 shows another embodiment of the present invention, in which (al) is a front view, (1) is (al) a BB' sectional view, and (C1 is (
It is a CC' sectional view of al. Rectangular thickened oscillator...1.7.14 Main electrode for excitation...2.8.15.21 Conductive adhesive...
...3.10.17.25 Support part that also serves as lead wire...4 Airtight terminal...5 Cylindrical ice tube...6 Lead electrode ...9.16.22 Support stand...
・・・・・・11.18.23 Board・・・・・・12
．． 20 Concave portion...19.24 C Figure 1 Figure 3 (b) Figure 3 (C)

Claims (1)

[Claims] A support structure for a rectangular thick-shear vibrator includes a pair of support stands extending substantially perpendicularly to the base of a container that houses the vibrator, and a pair of support stands extending substantially perpendicularly to the base stand on opposing surfaces of the support stand. 1. A support structure for a rectangular thickness-shear oscillator, characterized in that a recess extending in parallel is formed, and both longitudinal ends of the rectangular thickness-shear oscillator are inserted into the recess and supported.