JPH0215391Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a piezoelectric vibrator holding structure devised to obtain stable characteristics of the piezoelectric vibrator.

For example, in the case of a rectangular crystal resonator, a conventional holding structure includes two metal terminals 2 on a base 3, in which two metal terminals 2 are commonly fixed with an insulating material 1 such as glass or ceramic interposed, as shown in FIG. 1a. In order to hold the crystal diaphragm 4, a metal support 5 is fixed by brazing, soldering or spot welding. This metal support 5 is formed by pressing or etching a flat plate of a material with high springiness, such as nickel silver or nickel, bent at two places, and furthermore, the tip is formed into a U-shape in order to hold the crystal diaphragm 4. It has been formed.
The crystal diaphragm 4 is fixed by applying conductive adhesive 6 at four locations as shown in FIG. 1b.

However, with this holding structure, when fixing the metal supports 5 to the metal terminals 2, it is difficult to achieve positional accuracy for the pair of left and right metal supports 5, and the metal terminals 2 have a rigid structure while the metal supports 5 have a flexible structure. Because of this, the crystal diaphragm 4 is protected against strong vibrations and shocks.
is subjected to a large amount of stress using the metal terminal 2 as a support point, resulting in frequency fluctuations, output fluctuations, and destruction. If a hard metal is used to make the metal terminal 2 a rigid structure, it will be difficult to process the metal support 5 into a U-shape, and it will not only be difficult to achieve left and right positioning accuracy, but the crystal diaphragm will also be resistant to strong vibrations and shocks. Since the stress is applied directly to the crystal diaphragm 4 and there is no escape of the stress, either the crystal diaphragm 4 is destroyed, or the conductive adhesive 6 fixing the crystal diaphragm 4 is destroyed.

An object of the present invention is to provide a holding structure for a piezoelectric vibrator that eliminates the above-mentioned drawbacks, and the present invention will be described below with reference to the drawings of embodiments. FIG. 2 shows an embodiment of the present invention in which a crystal diaphragm 4 is placed parallel to the plane of the base 3. As shown in FIG. In the figure, instead of attaching the metal support 5 to the metal terminal 2, the base 3
The metal terminal 7 protruding from the upper surface side is processed as follows. This metal terminal 7 is made of a hard metal such as Kovar or an iron-nickel alloy, and is processed using an insulating material 1 such as glass as shown in the enlarged right half cross-sectional view of Fig. 2c.
The first point is the location immediately after the metal terminal 7 rises from the
The metal terminals 7 are bent in opposite directions at the bending portion 8. Proceeding diagonally upward from the first bending part 8,
The crystal diaphragm 4 is further bent upward at a second bending portion 9 having a length l slightly longer than the main dimension. Although this upper direction is perpendicular to the plane of the base 3 in the embodiment, it may be tilted so that the upper ends of the two metal terminals 7 are spread out from each other. The plate thickness t between the first bent portion 8 and the second bent portion 9 at these two locations
is processed so that it becomes thinner as it progresses diagonally upward. As can be seen from the figure, the dimension between the first bent part and the second bent part of the metal terminal 7 is the longest dimension among the metal terminals 7 on the base. Furthermore, the plate width w is processed so that it gradually becomes wider in the same direction of movement. Crystal diaphragm 4 is AT
A cut crystal plate is cut into a rectangular shape, and the main dimension is beveled or convexed in the longitudinal direction, and the thickness becomes thinner as it progresses toward the periphery. Extracting electrodes are arranged that extend from the periphery in opposite directions to the periphery. By soldering or applying a conductive adhesive 6 to this extraction electrode portion, the crystal diaphragm 4 is fixed both electrically and mechanically within the range from the second bent portion to the upper end of the metal terminal 7.

The present invention has the above-mentioned structure, especially the structure from the first bending part, which is the longest dimension of the metal terminal 7 on the base, to the second bending part, from a rigid structure to a relatively flexible structure, so that strong vibrations and It is possible to improve the durability against impact and to prevent the crystal diaphragm 4 and its fixed parts from being destroyed. Further, since the metal terminal 7 according to the present invention has an integral holding structure, positional accuracy can be improved and processing can be facilitated. Furthermore, as in this example, the width w of the metal terminal 7 to which the crystal diaphragm 4 is fixed is determined by the width w of the metal terminal 7.
Since the diameter of the crystal diaphragm 4 is larger than that of the crystal diaphragm 4, it is possible to easily hold the crystal diaphragm 4 and to make it strong.

FIG. 3 shows a crystal diaphragm 4 perpendicular to the plane of the base 3.
In this example as well, the metal terminal 10 advances diagonally upward from the first bending part 8 to the second bending part 9, and as it progresses, the metal terminal 10 gradually breaks the plate. It is processed so that the thickness t becomes thinner and the plate width w becomes wider. Then, in the middle from the second bent part 9 of the metal terminal 10 until it stands upright in the upward direction, an R surface is formed in a direction that projects toward each other, and a slit into which the end surface of the crystal diaphragm 4 is inserted is formed at the center line in the upright direction. Then, by soldering or applying a conductive adhesive 6 to the concave portion of the R surface, it is fixed electrically and mechanically to the extraction electrode of the crystal diaphragm 4.

This example also has the same effects as the previous example. In the above embodiments, quartz is used as the piezoelectric material, but it may also be a piezoelectric material such as lithium tantalate, lithium niobate, or piezoelectric ceramic.

As described above, according to the present invention, vibration resistance, impact resistance, and positional accuracy can be improved, and processing can be facilitated, so that the present invention has great practical value.

[Brief explanation of the drawing]

FIG. 1A is a perspective view showing a conventional holding structure, and FIG. 1B is a perspective view showing an example in which a crystal diaphragm is mounted on the conventional holding structure. Fig. 2a is a perspective view showing a holding structure according to an embodiment of the present invention, Fig. 2b is a perspective view showing an example in which a crystal diaphragm is mounted on the holding structure of this embodiment, Fig. 2c
is an enlarged right half cross-sectional view of Figure b. FIG. 3a is a perspective view showing a holding structure according to another embodiment of the present invention, and FIG. 3b is a perspective view showing an example in which a crystal diaphragm is mounted on the holding structure of this embodiment. 1... Insulating material, 7... Metal terminal, 3... Base, 4... Piezoelectric diaphragm.

Claims (1)

[Scope of utility model registration request] Holding a rectangular piezoelectric vibrator in which two metal terminals are fixed through the base with an insulating material interposed therebetween, and a rectangular piezoelectric diaphragm is electrically and mechanically fixed to the two metal terminals on the base. In the structure, from the first bent part having the longest dimension of the two metal terminals on the base to the second
The thickness is gradually made thinner and the width is made wider up to the bent part, and the piezoelectric diaphragm is placed near the second bent part,
A holding structure for a rectangular piezoelectric vibrator, which is characterized by being fixed.