JPS5919419A - Supporting structure of tuning fork type oscillator - Google Patents

Abstract

PURPOSE:To attain stable fT characteristics and frequency change characteristics due to the lapse of time, by providing a recessed part to a base of a tuning fork type oscillator and supporting the oscillator between the recessed part and the base, for decreasing the leakage of vibration to a case. CONSTITUTION:Bases A-B-...-E-F of the tuning fork type oscillator using torsional vibration are provided with recessed parts N-Q-R-P (or L-J-H-I-K-M), and a support 122 (or 132) serving also as a lead is fixed between the recessed part and the base and fixed to a case (not shown). The torsional vibration at the base (H-I) is decreased in comparison with the case without the provision of the recessed parts, and the leakage of the vibration to the case is decreased, because the oscillator is supported between the recessed part and the base. Further, the leakage of vibration is prevented further by forming the support into a U shape in the broadwise direction as the support 142.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tuning fork type vibrator that utilizes torsional vibration.

In recent years, tuning fork type crystal cameras that utilize torsional vibration have attracted attention. Both the use of torsional vibration alone and the use of elastic coupling of bending vibration and torsional vibration are attracting attention. In particular, in the latter case, the strength of the elastic coupling between bending vibration and torsional vibration should be appropriately selected to improve the frequency-temperature characteristics (hereinafter referred to as fT characteristics) of the former vibration, making it possible to use a vibrator for a high-precision wristwatch. It was targeted.

FIG. 1 shows a state in which a tuning fork type crystal sensor is sealed in a container. 11 is a tuning fork type crystal oscillator, 12 is an electrode lead that also supports the oscillator, 13 is a stem that supports the +7- cord,
14 represents a container that encloses the vibrator. When the vibration of the vibrator 11 is transmitted to the container 14 via the reed 12 and stem 13'i (hereinafter, this phenomenon is referred to as vibration leakage), if the amount of vibration is large, it may affect the fT% characteristic and frequency change characteristics over time of the vibrator 11. It is known to have significant negative effects. When the vibration leakage is large Ia, as shown in FIG. 1, when force F is applied to the container 13, the frequency of the vibrator changes greatly.

FIG. 2 is a plan view showing a support structure for a conventional tuning fork type crystal #R mover that utilizes the combination of bending vibration and torsional vibration.

21 is a tuning fork type crystal resonator, and 22 and 23 are support members that also serve as electrical connections to the excitation electrodes.

FIG. 3 shows a plan view of a tuning fork type crystal resonator.

It is called the base of a partial diatune-fork vibrator surrounded by six points A, B, O, D, Ei, and F'. That is, the base of the tuning fork type vibrator is a partial tone of the tuning fork type vibrator excluding two vibrating arms.

In the tuning fork type crystal camera having the support structure shown in FIG. 2, vibration leakage into the container due to bending vibration was extremely large. The reason for this is that the imaging displacement of the torsional imaging at the base is very large, and therefore the imaging displacement of the base of the bending imaging, which is elastically coupled to the torsional vibration, is very large. As a result, a tuning fork type crystal resonator that makes full use of the combination of bending vibration and torsional vibration has the disadvantage that stable fT characteristics and stable frequency change characteristics over time cannot be obtained. The present invention aims to improve this conventional drawback and provide a tuning fork type vibrator that uses torsional vibration alone with less imaging leakage or utilizes elastic coupling of bending imaging and torsional vibration. . The present invention will be described in detail below with reference to the drawings.

FIG. 4 shows a perspective view of a tuning fork type crystal resonator. ”
The r 7Z ” axis directions represent the width, length, and thickness directions of the tuning fork crystal resonator, respectively. It has a direction rotated by an arbitrary angle around it.

FIG. 5 shows the widthwise displacement ut (hereinafter abbreviated as ur) of the vibrator of torsional vibration on the base end straight line [(I) shown in FIG. ,u y/
It represents the relative magnitude of the displacement u Z / (hereinafter abbreviated as ug /) of the vibrator in the thickness direction. In Figure 5, 51 is uX, 52 is uy', 53
represent uz', respectively. This result was obtained using the finite hair accumulation method.

As is clear from FIG. 5, the amount of displacement due to torsional vibration at the base of the tuning fork type crystal resonator is extremely large in uz' compared to ux and u, /. Therefore, the reason why the vibration leakage in torsional imaging is large is that the displacement ug' in the thickness direction due to torsional vibration is extremely large at the base of the tuning fork type crystal sensor. Also, the reason why the imaging leakage of the bending vibration that is elastically coupled with the torsional vibration was large is also due to the thickness direction u at the base of the torsional vibration.
Since z' is large, the JilII[t11 vibration itself also has a large thickness direction displacement uz' at the base. In this way, in order to reduce the vibration leakage of torsional vibration alone or of bending vibration elastically coupled with torsional imaging, it is sufficient to reduce the thickness direction displacement uii''fir at the base of the vibrator.

FIG. 6 shows a plan view of a tuning fork type crystal resonator having four parts at its base. However, the outer dimensions of the tuning fork type crystal resonator shown in FIG. 6 are the same as the tuning fork type crystal resonator shown in FIG. 4 except that four parts are provided at the base.

Figure 7 shows the base end HI of the tuning fork type crystal resonator shown in Figure 4.
It represents the thickness direction displacement u zZ of torsional vibration on the base end H' of the tuning fork type crystal resonator shown above and in FIG. 71 represents us'e on HI in FIG. 4, and 72 represents us'e on H'I' in FIG.

As is clear from FIG. 7, when the four parts are provided at the base, the torsional vibration uz' at the end of the base becomes much smaller than when the four parts are not provided at the base. In addition, when the tuning fork type crystal resonator shown in FIG. 4, which does not have four parts at the base, torsively vibrates, u g / is very large at both ends in the width direction of the base, and the vibration is caused by a thick canopy in the width direction of the base. is being carried out. However, when the tuning fork type crystal camera shown in FIG. 6, which has four parts at its base, performs torsional imaging, the tilting vibration disappears at the end of the base. Providing the four parts at the base in this way has a very large effect in reducing vibration leakage.

FIG. 8 shows u m / of torsional imaging on straight line LM and straight line JK when the tuning fork type crystal resonator having four parts at the base shown in FIG. 6 performs torsional imaging.

As is clear from Figure 8, the straight line L on the tuning fork arm side of the fourth part
u15' on M and the straight line JK on the base end side of the recess
The magnitude of u z / above is extremely different.

The vibration displacement ug' is very small on the base end side of the four parts. Further, the tilting vibration at the base, which is characteristic of torsional vibration, almost disappears on the side of the concave base R4.

6-FIG. 9 shows a plan view of a tuning fork type crystal resonator having a recessed portion at the base end.

FIG. 10 shows the four straight fi! It represents the magnitude of ug' of torsional imaging on NP and @ line QR.

101 is u on the @ line NP, 102 is u on the straight line QR
g' respectively. As is clear from FIG. 10, ug' is much smaller than ug' on the straight line QR. Furthermore, the tilt vibration peculiar to the torsional vibration on the plane mNp has almost disappeared on the straight line QR.

Therefore, even if a concave portion is provided at the base end, the effect of completely reducing imaging leakage is significant.

FIG. 11 is a plan view showing an embodiment of the present invention. 11
Reference numeral 1 indicates a hemorrhoid-shaped crystal resonator, and reference numeral 112 indicates a support material that also serves as electrical continuity with an excitation electrode provided on the resonator. The support member 112 supports the tuning fork crystal resonator between the four parts provided at the base of the resonator and the end of the base.

FIG. 12 is a plan view showing another embodiment of the present invention. 1
Reference numeral 21 indicates a tuning fork type crystal resonator, and reference numeral 122 indicates a support member that also serves as electrical continuity with the excitation electrode provided on the side element. The support member 122 supports the tuning fork type crystal resonator at the four parts provided at the base end of the resonator and at the base end.

Figures 13 and 14 show other implementations of the invention. FIG. 13 shows a plan view thereof, and FIG. 14 shows a side view thereof. Reference numerals 131 and 141 indicate tuning fork type crystal sensors, and reference numerals 132 and 142 indicate support members that also serve as electrical continuity with excitation electrodes provided on the vibrator. The supporting members 132 and 142 support the tuning fork type crystal sensor between the four parts provided at the base of the tuning fork type crystal sensor and the base end. Furthermore, the vibrator has a U-shape at one point in the thickness direction. Support material 1
32 and 142 have a U-shaped shape in the thickness direction of the vibrator, which has a very large effect in preventing leakage during imaging.

Tuning fork type crystal t= of the present invention shown in FIGS. 11 to 14
The support structure of the wth element is such that between the recess provided in the base of the tuning fork type crystal sensor and the end of the base, the displacement ug5' in the thickness direction due to torsional vibration is extremely small, and the tilting at the base unique to torsional vibration is prevented. Since the vibrator is supported at a location where vibration does not occur, it is possible to provide a tuning fork type crystal camera element with less vibration leakage. It has a characteristic.

In the above description, all examples have been made of crystal cameras as vibrators, but the effects of the present invention also apply to tuning fork type cameras other than crystal as the material of the vibrators. Therefore, the present invention includes materials other than crystal as the material of the vibrator.

As explained in detail above, the support structure of the tuning fork type sensor of the present invention has less vibration leakage, and therefore has stable fT characteristics and frequency change characteristics over time. It has an immersed feature that allows it to provide a tuning fork type oscillator that utilizes coupling.

[Brief explanation of drawings]

FIG. 1 is a side view showing the structure of a tuning fork type vibrator and a container. Second
The figure is a plan view showing the support structure of a conventional tuning fork type vibrator. M3
The figure is a plan view of a tuning fork type vibrator. Figure 49 is a perspective view showing the shape and orientation of a tuning fork type crystal resonator. Figure 5 is a graph showing the six-direction components of displacement during torsional imaging at the base end face of a tuning fork type crystal resonator. FIG. 6 is a plan view of a tuning fork type crystal camera. FIG. 7 is a graph showing the displacement of torsional vibration at the base end of the tuning fork type crystal resonator shown in FIGS. 4 and 6, and FIG. Graph showing displacement of torsional vibration at three locations. FIG. 9 is a plan view of a tuning fork type crystal camera. Figure 10 shows the 9th
A graph showing the displacement of torsional vibration in the three cylinders ff1vS at the base of the tuning fork type crystal resonator shown in the figure. Figure 11, Figure 12,
Figure m13 is a plan view of a tuning fork type crystal resonator showing an embodiment of the present invention. FIG. 14 is a side view of the tuning fork type crystal camera according to the embodiment of the present invention shown in FIG. 13. 111, 121.131.141... Tuning fork type crystal oscillator 112, 122.132.142... Support material
Applicant Daini Seikosha Co., Ltd. Patent Attorney Agent Tsutomu Mogami-10- Male 10 Figure 1/Figure ll ¥/2111D Figure 73/, & 1,74 Figure t 95

Claims (3)

[Claims] (1) A support structure for a tuning fork vibrator that utilizes torsional vibration and has a recessed portion in its base, which is supported between the recessed portion and the end of the base. (2) A support structure for a tuning fork type vibrator according to claim 1, wherein the vibrator is a vibrator that utilizes elastic coupling of bending vibration and torsional vibration. (3) A supporting structure for a tuning fork type vibrator according to claim 1 or 2, wherein the vibrator is a crystal vibrator.