JPH0720971Y2 - Support structure for piezoelectric vibrator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a support structure for a piezoelectric vibrator, and more specifically, it supports a piezoelectric vibrating element plate such as a crystal upright, and this piezoelectric vibrating element plate In a piezoelectric vibrator having a three-terminal structure such as a piezoelectric filter in which electrodes are led to the outside from both sides and below, a support body for a portion in which the electrodes are led out is provided.

(Prior Art) An example of a conventional support structure for a piezoelectric vibrator will be described with reference to FIG. In FIG. 4, 6 is a crystal vibrating element plate, 61 and 62 are excitation electrodes formed on the surface of the crystal vibrating element plate, 63 is an excitation electrode formed on the back surface of the crystal vibrating element plate, and 71 and 72 are plate-shaped. A support body, 73 is a support body corresponding to the excitation electrode 63, 74 is a base, and 75, 76 and 77 are lead terminals electrically connected to the support body. The support body 73 has a structure in which a plate-shaped metal plate is bent 90 degrees.

(Problems to be Solved by the Invention) According to such a conventional support structure for a general piezoelectric vibrator, in particular, in the support body 73 portion corresponding to the excitation electrode 63, a conductive joint for joining the excitation electrode and the support body Mechanical strain may be applied to the piezoelectric vibrating element plate due to strain generated during curing of the material or due to dropping of the piezoelectric vibrator. In addition, thermal strain may be applied due to changes in ambient temperature. In such a case, according to the supporting structure as in the conventional example, the stress applied to the piezoelectric vibrating element plate is difficult to be relaxed as it is, and the electrical characteristics of the piezoelectric vibrator are deteriorated such that the frequency becomes unstable. was there.

In order to solve such a problem, the actual development Sho 59-121927
As is the case with the issue, the plate support has been made into a staircase shape so as to obtain a cushioning effect. However, due to the recent miniaturization of electronic devices, electronic components such as piezoelectric vibrators used for the electronic devices are also required to be miniaturized and have a low profile. In the configuration, it has been a factor that hinders miniaturization and low profile of electronic components such as piezoelectric vibrators. Further, since the plate support is difficult to stand on its own, there is a problem that the workability is poor because the positioning and mounting work on the metal base (base) is not easy.

The object of the present invention is to sufficiently relax this strain even if mechanical or thermal strain occurs, to prevent strain stress from being generated in the piezoelectric vibrating element plate, and to support downsizing and height reduction. It is an object of the present invention to provide a support structure for a piezoelectric vibrator that improves the workability of.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides at least one upright support body that is provided upright with respect to a base, and is placed flat parallel to the upper surface of the base. Piezoelectric vibration, in which an electrode-formed piezoelectric vibrating element plate is uprightly supported by a plate-shaped flat support body that electrically and mechanically connects the base vibrating element plate proximal portion and the base portion. In the child, a buffer portion having a planarly bent portion is provided between the piezoelectric vibrating element plate joint portion and the base joint portion of the flat support member.

(Operation) According to the present invention, since the base-proximity portion of the piezoelectric vibrating element plate and the base are connected by the flat support body having the buffer portion having the planarly bent portion, the piezoelectric vibrating element plate is connected. The stress strain generated between the base and the base can be relaxed, and unnecessary strain is not generated in the piezoelectric vibrating element plate. Further, since this flat support member has a plate-like shape and a bent portion is provided in a plane, the distance between the piezoelectric vibrating element plate and the base in the height direction (vertical direction in each drawing) can be minimized. Furthermore, since the flat support member is flat, the flat support member is not installed at an angle,
The workability when attaching the support body is improved.

(Embodiment) First Embodiment FIG. 1 shows a perspective view of a crystal filter as a first embodiment of the present invention.

The crystal vibrating element plate 1, which is a piezoelectric vibrating element plate, is an AT-cut quartz crystal plate, on the surface of which an input electrode 11 and an output electrode 12 are provided by means such as vapor deposition, and on the back surface thereof, a common electrode 13 is provided. Has been. Each of the above electrodes is an extraction electrode (111, 121, 13
It was pulled out to the end of the crystal vibrating element plate in 1). The base 4 has a hermetic structure in which a metallic shell is filled with an insulating glass material and the lead terminals 51, 52, 53 are penetrated through the shell, and is integrally molded by firing. The upright supports 21 and 22 have a structure in which slits are provided in a plate-shaped elongated metal plate, and are uprightly spot-welded to lead terminals protruding above the base. The flat support 31 placed flat on the base is also made of a metal plate, and the piezoelectric vibrating element plate joint portion
311 and a buffer portion 312 that has a bent portion in a plan view following this
And a base joining portion 313 subsequent to this, and the base joining portion 313 joins the base. In this embodiment, as shown in FIG. 1 (b), the flat support member 31 has a shape in which the base joint portion and a part of the buffer portion are E-shaped and this is connected to the piezoelectric vibrating element plate joint portion. Has been done. The bent portion of the buffer portion may be provided by punching with a press, etching, or the like.

As shown in FIG. 1 (a), the crystal vibrating element plate 1 is inserted into the slits of the upright support bodies 21 and 22 on the base 4, and the extraction electrodes 111 and 121 and these upright support bodies 21 and 22 are electrically conductively joined. While being fixed with a material, the extraction electrode from the common electrode (this part becomes the base proximity part) 131 and the flat support 31
The piezoelectric vibrating element plate bonding portion 311 of is bonded with a conductive bonding material. Although not shown, finally, the upper part of the base is covered with a metallic cap to complete the crystal filter.

Other Embodiments Another embodiment will be described with reference to FIGS. 2 and 3. In addition,
The same structural parts as those in the above-mentioned embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the embodiment shown in FIG. 2, the base joint portion 323 in the flat support body 32 placed flat on the base is surrounded by the buffer portion 322. Further, in the embodiment shown in FIG. 3, the slits provided in the flat support member 33 placed flat on the base are H-shaped, and each joint portion and buffer portion are formed.

In the above three embodiments, the buffer portion may be partially provided with a thin portion by half etching or the like. In this case, the cushioning action is further improved.

Further, the present invention is not applied only to the vibrator having the three-terminal structure shown in the above-mentioned embodiment. For example, when quoting the first embodiment, the upright support body 21 standing upright on the base and parallel to the base. It can also be applied to a two-terminal structure vibrator having only the flat support 31.

(Effects of the Invention) According to the present invention, since the base-proximity portion of the piezoelectric vibrating element plate and the base are connected by the flat support body having the buffer portion provided with the planar bending portion, the piezoelectric vibration A highly reliable piezoelectric vibrator that can alleviate the stress strain generated between the base plate and the base, does not generate unnecessary strain in the piezoelectric vibration base plate, and does not deteriorate the electrical characteristics of the piezoelectric vibrator. Can be provided. Also,
Since this flat support has a plate-like bent portion in a plane, the distance in the height direction (vertical direction in each drawing) between the piezoelectric vibrating element plate and the base can be minimized, and thus the completed vibration can be achieved. It is possible to reduce the size and height of the child.

Further, since this flat support body can be flatly placed on the base and occupies a large area, it is easier to position as compared with the support body shown in the conventional example, and the workability is improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (a) and FIG. 1 (b) are views showing an embodiment according to the present invention, FIG. 2 and FIG. 3 are views showing other embodiments, and FIG. It is a figure which shows a prior art example. 1 …… Crystal vibrating element plate (piezoelectric vibrating element plate) 21,22 …… Upright support body 31,32,33 …… Platform support body 311,321,331 …… Piezoelectric vibrating element plate joint part 312,322,332 …… Buffer part 313,323,333 …… base Platform joint

Claims (1)

[Scope of utility model registration request] 1. An at least one upright support body provided upright with respect to a base, and a flat plate placed substantially parallel to the upper surface of the base, and electrically connecting the base proximity portion of the piezoelectric vibrating element plate and the base. In a piezoelectric vibrator in which an electrode-formed piezoelectric vibrating element plate is uprightly supported on a base by a plate-shaped flat supporting element that is mechanically and mechanically connected, the piezoelectric vibrating element plate joint portion of the flat supporting element A support structure for a piezoelectric vibrator, wherein a buffer portion having a planarly bent portion is provided between the base and the base joint portion.