JPS58172008A - Structure and manufacture of piezoelectric oscillator - Google Patents

Abstract

PURPOSE:To reduce the cost of a piezoelectric oscillator by mass production by notching the intersection of the circumferential edge part of a sealing body for sealing the piezoelectric oscillator and a piezoelectric oscillator electrode lead part to specific area and exposing the electrode lead part. CONSTITUTION:A crystal oscillator 1 is formed by sticking electrodes 2 and 3 to both surfaces of a crystal blank plate and notches 6 and 7, and 8 and 9 are made at two edges of crystal plates 4 and 5 which are aligned to each other and provided with a recessed part so that a slight gap is obtained at the center part of the blank plate 1. In those notches, electrode lead parts 10 and 11 extending from the electrodes 2 and 3 are exposed and connected to an electronic circuit. Then, the upper and lower spread center parts of cantilever parts of a U-shaped metallic fixture 11 are fitted in the edge parts having the notched parts and fixed with a conductive adhesive. Consequently, the oscillator is arranged on a printed board in various attitudes without a breakdown of an electrode lead part and any lead.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a pressure-4 method aimed at cost reduction through mass production.
The present invention relates to the structure and manufacturing method of a vibrator.

As is well known, the piezoelectric transducer's sealing structure is such that electrodes are attached to individual piezoelectric substrates processed to predetermined shapes, thicknesses, and surface conditions. It was common to attach the wire by making electrical connections and mechanically holding it, then covering it with a sealing tube and sealing it.

As is clear from the above-mentioned process, it is difficult to automate the manufacturing process of piezoelectric vibrators, and therefore the process has to be expensive.

The present invention has been made in view of the above-mentioned circumstances, and involves simultaneously attaching a large number of electrodes and electrode lead portions to a large horizontal piezoelectric substrate, and placing the electrode attachment surface at an appropriate position corresponding to the electrode lead portion. The piezoelectric substrate having a through hole or notch with a desired area is covered with a sealing member having the same area as desired, and after bonding to the piezoelectric substrate around each electrode, the through hole is formed by a line passing through the center of the hole. It is an object of the present invention to provide a piezoelectric vibrator which is suitable for mass production and whose manufacturing process is automated, and which has an electrode lead portion exposed at the side edge of the sealing body by cutting, and a method of manufacturing the same.

Hereinafter, the present invention will be explained in detail based on drawings showing embodiments.

FIGS. 1(a) and 1(b) are a sectional view and a perspective view, respectively, showing the structure of a pressure vibrator according to the present invention.

A crystal resonator having electrodes 2 and 3 attached to both sides of the crystal plate 1 is aligned with the crystal resonator, and a recess is provided in the center of the crystal plate 1 to provide a slight gap. It has a structure in which 4 and 5 are tied together. There are notches 6 on each of the two edges of the crystal plates 4 and 5.
7, 8, and 9 are cut out from the electric bridges 2 and 3, respectively (to expose the pole lead portions 10 and 11 and connect them to an electronic circuit).

However, with only the configuration shown in FIG.
Since there is a high possibility that the piezoelectric vibrator element plate in 7 and 7 will be damaged by external force, it is necessary to use a U-shaped metal fitting 11 as shown in FIG. The structure is such that a curved part is inserted into the edge having the notch and fixed with a conductive adhesive or the like. A cross-sectional view and a perspective view thereof are shown in FIGS. 12(b) and 12(C), respectively.

By doing so, the vibrator of the present invention can be placed on a printed circuit board in various postures without taking any leads, without considering damage to the electrode lead portions.

FIG. 3 is a cross-sectional view showing a modification of the embodiment shown in FIG. 2, in which the edge portion having the cutouts 6 and 7 is dipped in a conductive adhesive instead of the metal fitting 11, and an adhesive layer 12 is formed. ” This is the core of the story.

1. The present invention is applicable not only to the piezoelectric vibrator having electrodes on both sides as described above, but also to the electrode surface of a vibrator having electrodes on only one side, such as the surface acoustic wave vibrator 13 shown in FIG. 114. You can also.

In the case where the four corners of the piezoelectric vibrator element plate are fixed by the above-mentioned chindwitch structure, if the sealing bodies 4 and 5 are made of the same material as the piezoelectric vibrator element plate and their axes are aligned, thermal expansion can be prevented. Since it is uniform, there is no stress on the vibrator element plate, but it is expensive.

Therefore, the sealing body may be made of glass and the piezoelectric vibrator may have a structure as shown in FIG. 5 or 46.

That is, the required slits 14,
By forming the slits 15, 15 by etching, for example, and attaching the sole pole 17 to the center portion 16 surrounded by these slits, only the center portion 16 of the blank plate 1 is allowed to participate in vibration, and this and the outermost periphery A pressure 'flL vibrator is used as a cushion between the fixed part and the fixed part.

When JFr<full, the LIS force on the vibrator element plate due to the difference in expansion coefficient between the vibrator and the sealing body can be reduced to a level that does not pose a practical problem.

In addition, as shown in Figure 6, when the above-mentioned S')y 14 is straight, for example, if Jt 4 My is an A T'-cut crystal, the point of zero frequency fluctuation with respect to the pressure of the cut, In other words, the connection between the slit outer periphery and the vibrating part 16 can be set at a position of 60@1201 with respect to the axis, so that the influence of stress can be avoided by extending the electrode lead through the core. .

Next, a method for mass producing piezoelectric vibrators according to the present invention will be briefly explained using FIGS. 7 and 8.

FIG. 7 is an explanatory diagram showing the manufacturing process, in which predetermined slits 14, 14, .
For example, if the substrate is quartz, it is etched, or if the substrate is ceramic, it is formed during molding, and then the electrode l) and the 'magnetic pole lead part 18.18.・・・
. . . is attached by vapor deposition or plating, and on f, a sleeve surrounding each electrode) 14, 14. ...Glass solder on the outer periphery of Qiaochishi 1HP1 19.19.・・・・・・
... is attached by screen printing.

On both sides of the pressed vibrator substrate 1 processed as above, there are gaps 20° 20, which can seal the vibrator electrodes formed in large numbers on the substrate 1 and the slits surrounding them, Lead electrode 18.18. Cutouts or slits 21, 21 .・・・・・・
The glass sealing plates 22 with the
The glass solder 19 is used for adhesion.

After that, this sandwich plate is attached to the target (slabs exposing the electrode board parts) 21, 21. . . . is cut with a cutter along a line passing through the center of the plate to produce a sandwich plate 23 in which a large number of chip vibrators of the present invention are lined up in rows as shown in Fig. sS.

At the same time, a thin metal plate is pressed into a U-shape on both sides of the sanderch plate 23 in the direction of construction (cuts of a predetermined width are made at equal intervals on the free edges thereof).

Bend this and make the contact piece with the electrode lead part 24.24°.
If a lead terminal member 25 of .

Note that the lead terminal member 25 is attached to the plate 23
Needless to say, if the core part is dipped in conductive adhesive and then cut, a similar chip vibrator as shown in Fig. IIs can be obtained.

It is not necessary to cut the sealed tint inch plate of each successive vibrator with a diamond cutter or the like; for example, a V-shaped notch may be provided on the cutting line of the sealing body 22. It may be possible to press it (=therefore break it).

When using such a cutting method, it is clear that it is better to use a conductive adhesive dip as the lead member than a metal one.

Since the present invention is constructed as described above, it is possible to produce chip-shaped piezoelectric vibrators at extremely low cost, and the completed vibrator can be mounted freely on a printed circuit board on which other electronic circuits are arranged. The electronic circuits become smaller.

This has a remarkable effect on lowering prices.

[Brief explanation of the drawing]

FIGS. 1(a) and (b) are a sectional view and a perspective view, respectively, of the chip resonator sealed body of the present invention, and FIGS. 2(a) and (b) are respectively the oscillator sealed body of FIG. 1. A cross-sectional view and a perspective view showing a state in which a metal lead member is fitted, FIG. 3 (C) is a perspective view of the metal lead member, and FIG. FIG. 4 is a cross-sectional view showing an embodiment in which the present invention is applied to a surface acoustic wave resonator. 5 and 6 are diagrams showing examples of different structures of the resonator used as the chip resonator of the present invention, FIG. 7 is an explanatory diagram of the chip resonator manufacturing process of the present invention, and FIG. 88 is a lead It is an explanatory view of a member attachment process. 1... Pressure 4 vibrator, 4, 5... Sealing body 6, 7.8 and 9... Notch, 10, 11. and 1
8... Lead electrode, 11. ...Metallic lead member 1
2... Conductive adhesive, 21... Hole or cutout for exposing the electrode lead part

Claims (1)

[Scope of Claims] (1) The piezoelectric vibrator is integrated with a sealing body that seals the entire peripheral edge of both surfaces or one side thereof, and the piezoelectric vibrator electrode lead portion of the peripheral edge of the sealing body is integrated with the piezoelectric vibrator. A structure of a piezoelectric vibrator, characterized in that a predetermined area of the intersection portion is cut out to expose the electrode lead portion. (O) The edge portion having the notch portion of the sealing body that hermetically houses the piezoelectric vibrator is fitted into a metal lead member, and this and the electrode portion are electrically connected. The structure of a piezoelectric vibrator according to claim 1, characterized in that: (8) A conductive adhesive is attached to at least an edge portion having the notch portion of a sealed body in which the piezoelectric vibrator is hermetically housed. According to claim I, the electrical contact between the electrode lead portion and an external circuit is formed by
I Box 1 Structure of a piezoelectric vibrator. (4) Through-holes or through-holes are formed on both or one side of a piezoelectric substrate having a predetermined shape to which a large number of electrodes and electrode lead portions are attached, and which have substantially the same shape as the substrate and are placed in advance at positions corresponding to the electrode lead portions. After adhering a pressure resonator sealing body provided with a notch or both, it is cut through the center of each through hole of the sealing body to form individual sealed pressure cans. A method for manufacturing a piezoelectric vibrator, characterized in that a vibrator is obtained. (5) Each through-hole of the sealing body has a large number of sealed holes by cutting a V-shaped groove in advance at a portion corresponding to a cutting line passing through the center of the sealing body and cutting it at the political situation. A method for manufacturing a piezoelectric vibrator, characterized in that individual sealed piezoelectric vibrators are obtained from a single plate-shaped body having a piezoelectric vibrator without using a cutter.