JPS5844652Y2 - Oscillator support structure - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a support structure for a piezoelectric oscillator made of a crystal such as a crystal oscillator or a ceramic oscillator.

As shown in Fig. 1, the conventional support structure for a crystal resonator is generally such that the opposite metal electrode films 2 and 3 of the resonator are held between two elastic metal support wires 4 whose ends are double-wound and bonded with solder or the like. The structure is such that the base 5 is insulated with glass or the like and external terminals 6 are drawn out.

However, the piezoelectric vibrator configured in this way is
If the spring pressure of the metal elastic support wire 4 described above is strong, the stress acting on the vibrator will be large and the Q value will be reduced. If the spring pressure is weak, it will be weak against external shocks, and the metal electrode film 2 and the metal elastic support wire Conductive adhesion with No. 4 causes a large drop in Q value due to viscous attenuation, making it difficult to apply to small-sized devices such as wristwatches, which have been attracting attention in recent years.

The present invention is an attempt to overcome the drawbacks of the prior art described above with respect to a support structure for a piezoelectric vibrator of a particularly small size such as for a wristwatch.

This will be explained below with reference to the drawings.

FIG. 2 is a perspective view showing an embodiment of the present invention, and the upper sealing cap is omitted.

FIG. 2 shows a piezoelectric vibrator plate which has a rectangular shape in the figure, but it may have a disk shape or any other shape such as convex processing or bevel processing.

2 is a metal electrode film extending to the end of the piezoelectric vibrator plate for extraction.

For 3.4 and 5.6, an insulating member having elasticity or a plastic resin material may be used.

3 and 5 are attached to the lower base 9, and 4 and 6 are attached to the upper cap (10 in FIG. 3, which will be described later).
The shapes of the cap 10, the inner shape of the base 9, the shape of the end face of the piezoelectric vibrator 1, the electrode lead wire 7, and the external lead wire Figure 4 a, l), respectively, with space for 8, etc.

Do as shown in C and d.

Here al, bl, CI, di are plan views, a2. b2.
C2, d2 has a side view a3. b3. C3, d3 shows a front view.

Reference numeral 7 denotes a thin wire connecting the electrode metal film 2 and the external lead wire 8 by a wire bonding method or the like, and the counter electrode is also constructed in the same manner.

In addition to the method described above, welding of a metal ribbon to the electrode metal film 2 can also be used to connect the electrode metal film 2 and the external lead wire 8.

To assemble the piezoelectric vibrator body, as shown in FIG. 3, the piezoelectric vibrator is fixed in the recesses of the insulating members 3 and 5 mounted on the base 9, and the wiring for the electrode extraction is performed.

Thereafter, the upper cap 10 to which the insulating members 4 and 6 are attached is sealed by crimping or soldering.

As described above, since the present invention supports the vibrator in pressure contact with a flexible insulating member, it has the following effects.

In other words, since the vibrator is positioned by an insulating member, the position of the vibrator will hardly shift especially in the event of a fall impact, and since the insulating member is flexible, a sudden force will be applied to the vibrator. It is not easily destroyed and does not cause frequency changes.

On the other hand, when rigid support is used, the vibration of the vibrator is directly transmitted to the case via the rigid support material, causing dissipation of vibration energy.

As a result, the equivalent resistance of the vibrator increases, that is, the Q value decreases.

Since the present invention uses a flexible support material, almost no vibration energy is dissipated, and a high Q value can be maintained.

[Brief explanation of drawings]

Figure 1: Conventional vibrator support. 1... Piezoelectric vibrator, 2, 3... Metal electrode film, 4, 4'... Metal elastic support wire, 5...
...Base, 6,6'...External electrode terminal. FIG. 2 is a perspective view of the vibrator structure of the present invention. 1... Piezoelectric vibrator, 2... Metal electrode film, 3, 4, 5° 6... Insulating member, τ...
...Electrode lead line, 8...External electrode lead line, 9...Base. FIG. 3 is a sectional view of the upper cap, insulating member, piezoelectric vibrator, and base of the vibrator structure of the present invention. FIG. 4 is an external view of an insulating member explained in an embodiment of the present invention.

Claims (1)

[Scope of utility model registration request] It has a vibrator and a vibrator sealing case, the vibrator sealing case is composed of an upper cap and a lower base, and each of the upper cap and the lower base is provided with a flexible insulating member. A support structure for a vibrator, characterized in that the vibrator is pressed against the flexible insulating member.