JPS5847885B2 - Oscillator support structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support structure for a crystal or ceramic resonator such as a quartz resonator.

As shown in FIG. 1, the conventional support structure for a crystal resonator is generally such that the crystal resonator is held between opposing metal electrode films 2 and 3 by metal elastic support wires 4 and 4l whose ends are double-wound, and soldered, etc. The external terminal 6 is attached to the base 5 and insulated with glass or the like, and the external terminal 6 is pulled out.

However, the piezoelectric vibrator configured in this way is
If the spring pressure of the metal elastic support wires 4, 4l described above is strong,
The stress acting on the vibrator is large and the Q value of the vibrator decreases.
Weak spring pressure makes it vulnerable to external shocks, and the conductive adhesion between the metal electrode films 2, 3 and the metal elastic support lines 4l, 4 causes vibration to be attenuated due to viscosity, resulting in a decrease in the Q value of the vibrator. Due to their large size, it is difficult to apply them to small-sized products such as wristwatches, which have been attracting attention in recent years.

The present invention is a support structure for a particularly compact piezoelectric vibrator for use in wristwatches, etc., and is intended to overcome the drawbacks of the prior art described above.

This will be explained below with reference to the drawings.

FIG. 2 is a perspective view showing one embodiment of the present invention, with the upper cap of the sealing case omitted.

Figure 2 shows a piezoelectric vibrator plate, which has a rectangular shape in the figure.
It may be in the shape of a disc, or it may be convex-processed, bevel-processed, or the like.

2 is a metal electrode film extending to the end of the piezoelectric vibrator plate for extraction, and is also formed symmetrically on the back side of the vibrator.

3, 4, 5, and 6 may be insulating members having elasticity or plastic resin materials.

3 and 5 are positioned on the lower base 9, and 4 and 6 are positioned on the upper cap (10 in FIG. 3, which will be described later), respectively, corresponding to the piezoelectric vibrator 1 and the electrode lead wire 7, etc. The shape of each cap is 10 for inclusion.
, taking into consideration the inner shape of the base 9, the shape of the piezoelectric vibrator 1, the electrode lead wires 7, the external lead wires 8, etc., as shown in FIG. a1, b1, c1, d1 are the plan view a2, b2
, c2, d2 show side views, and a3, b3, C3, d3 show front views.

), in these cases, applying stress to each other between these insulating members and the vibrator will suppress the vibration of the vibrator as described above, so they were placed as a vibrator body as shown in Figure 3. In this case, the vertical contact area between the vibrator 1 and the insulating members 4 and 6, and the horizontal contact area between the vibrator 1 and the insulating members 3, 4, and 5.6 are spaced from several μm to several hundred μm, respectively. Make sure you have enough time.

Therefore, this insulating member has the functions of allowing the vibrator to move in all directions, protecting the vibrator from external forces from all directions, and supporting the vibrator.

The electrodes of the vibrator are drawn out using a thin wire 7 that connects the electrode metal film 2 and the external lead wire 8 by wire bonding or the like, and the counter electrode is constructed in the same manner.

Note that the electrode metal film 2 and the external lead wire 8 can be connected by welding a metal ribbon to the electrode metal film 2.

To assemble the piezoelectric vibrator body, the piezoelectric vibrator is fixed in the recesses of the insulating members 3 and 5 mounted on the base 9 as shown in FIG. The upper camp 10 to which the members 4 and 6 are attached is sealed by crimping or soldering.

Due to its flexibility, the electrode lead wire 7 of the piezoelectric vibrator body constructed in this way does not apply stress to the vibrator via the vibrator, and the connecting portion with the vibrator electrode metal film is also smaller than that of the conventional method. Because it is sufficiently small, it does not cause a decrease in the Q value that conventionally occurs due to a large amount of adhesive, and because of the space between the insulating member and the vibrator in the vertical and horizontal directions, it is not subjected to stress due to support, and is resistant to shock. Therefore, it is possible to obtain a compact vibrator body without causing the electrodes of the vibrator to open or break.

[Brief explanation of the drawing]

FIG. 1 shows a conventional vibrator support structure. FIG. 2 shows a perspective view of the vibrator structure of the present invention. 1... Piezoelectric vibrator, 2... Metal electrode film, 3, 4, 5, 6... Insulating member, 7...
...Electrode lead line, 8...External electrode lead line, 9...Base. FIG. 3 shows a sectional view of the upper cap, insulating member, piezoelectric vibrator, and base of the vibrator structure of the present invention. FIG. 4 shows a plan outline view of an insulating member according to an embodiment of the present invention.

Claims (1)

[Claims] 1 includes a vibrator and a vibrator sealing case, the vibrator sealing case is composed of an upper camp and a lower base, and each of the upper cap and the lower base is provided with an insulating material. 1. A support structure for a vibrator, characterized in that the vibrator is inserted between each of the insulating members with a space left between the insulating members.