JPS59151515A - Supporting structure of tuning fork type crystal oscillator - Google Patents

Abstract

PURPOSE:To prevent oscillation from being leaked by supporting a tuning fork type crystal oscillator utilizing torsional oscillation at a position where the displacement of a subordinate oscillation is small by two leads. CONSTITUTION:A tuning fork type crystal oscillator 81 utilizing torsional oscillation is supported by the leads 82, 83. The displacement by the subordinate oscillation specific to the torsional oscillation is smaller at a range between points D and E which are midpoints respectively between points B, C on a prolonged line of straight lines 86, 87 at the end in the broadwise direction of tuning fork arms 84, 85 and points F, G at the end in broadwise direction of the base. Further, the leads 82, 83 are provided at the inner side from the points D, E and on one face. Thus, the leakage of the oscillation through the leads 82, 83 is prevented. Thus, the supporting process is made simple with simple structure.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a support structure for a tuning fork crystal resonator that utilizes torsional vibration.

(Prior Art) In recent years, tuning fork type crystal cameras that utilize torsional vibration have been attracting attention. Both the use of torsional imaging alone and the use of elastic coupling between bending vibration and torsional imaging are attracting attention. In particular, in the latter case, the aim is to appropriately select the strength of the elastic coupling between bending vibration and torsional imaging, and to improve the frequency-temperature characteristics of the former vibration to create a high-precision wristwatch vibrator.

FIG. 1 shows a state in which a tuning fork type crystal sensor is enclosed in a container. 11Fi tuning fork type crystal resonator, 12 is an electrode lead that also supports the resonator, a stem that supports the "Fi')-de, and 14 is a container that encloses the resonator.Resonator 11
When vibrations are transmitted to the container via the reed 12 and stem 13 (hereinafter, this phenomenon is referred to as vibration leakage), if the amount is large, it will have a great negative impact on the frequency temperature characteristics and frequency change characteristics of the vibrator 110 over time. Giving is what I'm known for. If the vibration leakage is large, a force F is applied to the container 16 as shown in FIG.
, the frequency of the oscillator changes significantly.

FIG. 2 is a plan view showing a conventional support structure for a tuning fork type crystal resonator that utilizes a combination of bending vibration and torsional vibration. FIG. 3 is a side view of a support structure for the conventional tuning fork type crystal resonator shown in FIG. 2. 21 and 31 are tuning fork type crystal oscillators, 2
2, 26, and 32 represent electrode leads '5c which also serve as support for the vibrator.

As is clear from FIG. 2, the electrode leads 22 and 25 are
The tuning fork type crystal resonator is supported at the widthwise end of the base of the tuning fork type crystal resonator (here, the base refers to the part of the tuning fork type crystal resonator excluding the two tuning fork arms). ing.

This support structure has a simple structure because it is supported by two σ) electrode leads on one main surface of the tuning fork type crystal mover. Here, the main surface refers to the surface with the largest area in the tuning fork crystal resonator.

However, with this support method, as will be described later, as a result of being directly affected by the tilting vibration at the base, which is unique to torsional vibration,
Vibration leakage is very strong. For this reason, there was a major drawback in that stable frequency temperature characteristics and frequency aging characteristics could not be obtained.

FIG. 4 is a plan view showing a conventional support structure for a tuning fork crystal resonator that utilizes a combination of bending vibration and torsional imaging. g
FIG. 4cS is a side view of a conventional support structure for the tuning fork type crystal resonator shown in FIG. Reference numerals 41 and 51 represent tuning fork type crystal resonators, and reference numerals 42, 52, and 55 represent electrode leads that also serve as support for the resonators.

The support structure of the tuning fork crystal resonator shown in Figs. 4 and 5 is as follows:
It has a structure that is not affected by tilting vibration at the base of torsional vibration, which will be described later. However, since this support structure is supported by sandwiching, it has the disadvantage that the process of sandwiching the tuning fork crystal resonator between two leads and the process of gluing the leads to the tuning fork crystal resonator are extremely troublesome. had.

(Objective of the Invention) The present invention eliminates these conventional drawbacks and provides a support for a tuning fork type crystal mover that is not affected by the tilting vibration peculiar to torsional vibration at the base of the vibrator, has a simple structure, and has a simple supporting process. The purpose is to provide structure.

(Structure and operation of the invention) Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 6 shows a perspective view of a tuning fork type crystal resonator.

The directions represent the width, length, and thickness of the tuning fork-shaped crystal mover, respectively.xll
II is the electric axis of the crystal, the y'' and 2' axes are the mechanical axis and the optical axis of the crystal, respectively, and the directions are rotated by arbitrary angles around the X axis.No. 61 and 62 are the two tuning fork arms. It shows.

65 and 64 respectively represent the inner straight line 7 (out of the two straight lines) along the length direction of the vibrator at both ends in the width direction of the first tuning fork arm.

65 and 66 represent outer straight lines. Point A.

B, O, D, and E are on a straight line along the width direction of the vibrator, which is located at the longitudinal end of the base. Point A is located at the midpoint of the vibrator in the width direction. Points B and C are straight lines 63 and 6, respectively.
It is an extension of 4. Point F and point Gt4 are located at the ends in the width direction of the vibrator. Point DFi is located at the midpoint between points B and F, and point E is located at the midpoint between points C and G.

Figure 7 shows the straight line F'G of the tuning fork crystal resonator shown in Figure 6.
The transducer width direction displacement u t+ of the torsional vibration above
, the longitudinal displacement uy' of the vibrator, the thickness direction displacement uy of the vibrator, and the relative magnitudes of /. In FIG. 7, 71 is ux and 72 is uy'.

73 is ull'? each represents. This result could not be obtained by calculation using the finite element method. As is clear from FIG. 7, the displacement t of the torsional vibration at the base of the tuning fork crystal resonator is as follows:
Very large. Therefore, the reason why the vibration leakage of torsional vibration is large is that the displacement u z / in the thickness direction of torsional vibration is very large at the base of the tuning fork type crystal resonator.

As is clear from the curve 75 in FIG. 7, when the tuning fork type crystal stander is torsionally vibrating, at the longitudinal ends of the base, u at both ends in the width direction and at the center in the width direction of the base, /
are performing different aoshi vibrations. In addition, at the longitudinal ends of the base, as the width approaches both ends of the base, the rate of change in the size of uI+L' (hereinafter referred to as the rate of change) 61 increases, and at the center of the width, ug
It can be seen that the rate of change in the size of / is relatively small. Then, from point F and point E to point G, the magnitude of ug' changes rapidly.

From this fact, in order to avoid vibration leakage in a tuning fork crystal resonator that produces torsional vibration noise, it is necessary to locate the area near the center in the width direction where ui'' is small and the rate of change in the size of s is small, that is, near point A. It is desirable to support it.

From this point of view, the conventional example shown in the fourth quotient and in FIG. 5 is unsuccessful in reducing vibration leakage. However, in this case, the supporting process is troublesome, and the reliability and mass production of the vibrator are poor. In the present invention, the magnitude of um / is small and the rate of change in the magnitude of ug / is small,
The vibrator is characterized by being supported by two leads on the same main surface.

As mentioned above, the point where the rate of change in the magnitude of u11' and the magnitude of uIl' is small is that the extension line of the straight line along the length direction of the sensor at the inner end in the width direction of the tuning fork arm is at the base. This is the distance from the point where the ends intersect to the middle of the base in the width direction. That is, in the present invention, in FIG.
The feature is that the point and point E are supported on the same main surface by two leads.

(Embodiment) FIG. 8 is a plan view showing an embodiment of the present invention. 9th
The figure shows a side view of FIG.

81 and 91 are tuning fork crystal resonators, and 82, 83, and 92 are leads. Points A, B, C! ,D,E.

F and G correspond to points A-G explained in FIG. 6, respectively. The two leads are between the dot and point E.

FIG. 10 is a plan view showing another example of an actual gun using the tuning fork type crystal oscillator of the present invention. FIG. 11 shows a side view of FIG. 101 and 111 are tuning fork type crystal oscillators, 102
, 103, and 112 indicate leads. Points A, B, O
, D, and E correspond to points A-EK explained in FIG. 6, respectively.

However, the distance between the widthwise center of the base of the tuning fork type crystal j7jji 101 is defined as the distance between the point G' and the point F'.

The tuning fork type crystal resonator shown in Figure $10 has a shape in which both ends in the length direction and both ends in the width direction of the base are cut off. This shape of tuning fork crystal s-movement has torsional motion u,′
By cutting off both ends in the width direction of the base where the rate of change in the magnitude of and u ts / is large, this has the effect of preventing tilting vibrations at the base that are specific to torsional imaging.

On the straight gland H at the longitudinal end of the base, there is a
qualitatively matches the characteristics of the graph of FIG. 7 excluding the cut-off portion of the base shown in FIG. Therefore, even in the tuning fork type crystal resonator having the shape shown in Fig. 10,
If the lead position is between the dot and point E, vibration leakage will be reduced.

By the way, the graph shown in FIG. 7 showing the state of displacement at the base of the tuning fork type crystal resonator that undergoes torsional movement is obtained when the shape of the tuning fork type crystal resonator is under the following conditions. That is, when the length and width of the tuning fork arm are L and W, respectively, and the length of the base is 2b, w/R'';o, 1.fib/J
! = o, 4, if the shape of the tuning fork type crystal oscillator is different,
The thickness of the displacement at the base of the torsional IT vibration naturally differs from that shown in FIG. However, even if the absolute values of the displacements are different, uX, u7',
u! The relative relationship between the magnitude of displacement of ' and the change in u z / at the longitudinal end of the base along the width direction of the sensor are almost the same as the results shown in FIG. Therefore, the above discussion of the present invention generally applies to tuning fork type crystal resonators that undergo torsional vibration.

Furthermore, in the above description, the tuning fork type crystal resonator using only torsional vibration has been described on the gold side. However, as mentioned above, a tuning fork type crystal resonator that fully utilizes the elastic coupling of bending vibration and torsional S-shifting has been considered as a highly elliptic resonator. When this vibrator is assembled into an oscillation circuit, the vibration mode that oscillates is bending vibration, but as a result of using elastic coupling with torsional vibration, the bending vibration itself has a large displacement component of torsional vibration at the base. I'll have at least a few. Therefore, the above discussion regarding the present invention also applies to a tuning fork type crystal resonator that utilizes elastic coupling of bending vibration and torsional vibration.

(Effects of the Invention) By the way, when utilizing the elastic coupling between bending vibration and torsional imaging, conventionally it has been mainly considered to utilize the elastic coupling between the secondary vibration of bending and the fundamental vibration of torsion. However, when using the elastic coupling of the fundamental vibration of bending and the fundamental vibration of @re,
Compared to the case where elastic coupling of the secondary vibration of bending and the fundamental vibration of torsion is used, when the frequency of the bending vibration is made the same, the thickness of the camera element can be made thinner. Therefore, when making a vibrator using photolithography, it requires less etching time and has the advantage of allowing the vibrator to be made smaller.

By the way, when trying to make the fundamental vibration of bending and the secondary vibration the same frequency, a tuning fork crystal resonator that uses the fundamental vibration of bending has a lower frequency than a tuning fork crystal resonator that uses the secondary vibration of bending. , the length of the tuning fork arm must be shortened and the width of the tuning fork arm must be widened.

As a result, the width of the entire vibrator becomes much wider than that in the case where secondary vibration of bending is used. As the width of the entire vibrator increases, tilting vibration at the base during torsional imaging increases. That is, u at the widthwise end of the base
w/ becomes very large. For this reason, the present invention, which is characterized in that the camera element is supported at a location close to the center of the base in the width direction, is particularly suitable for tuning fork-type crystal resonators that utilize the basic photography of bending and the basic photography of torsion. , exhibiting excellent properties.

As described in detail above, the present invention has great effects in manufacturing all tuning fork type crystal resonators that utilize torsional vibration and have a support structure with less vibration leakage and a simple supporting process.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the structure of a tuning fork type □ crystal resonator and a container. FIG. 2 is a plan view showing the support structure of a conventional tuning fork type crystal resonator. FIG. 5 is a side view of the conventional example shown in FIG. 2. FIG. 4 is a plan view showing another support structure for a conventional tuning fork type crystal resonator. FIG. 5 is a side view of the conventional example shown in FIG. 4. FIG. 6 is a perspective view showing the orientation of a tuning fork type crystal resonator. FIG. 7 shows ux and uy' at the base of the tuning fork crystal resonator shown in FIG.
, a graph showing the size of us'. FIG. 8 is a plan view showing an embodiment of the present invention. 9 is a side view of the embodiment of the invention shown in FIG. 8; FIG. FIG. 10 is a plan view showing another embodiment of the present invention. FIG. 11 is a side view of the embodiment of the invention shown in FIG. 10. 81.91,101,111... Tuning fork type crystal resonator 8
2.83,92,102,103,112 ... Reed and above Applicant Daini Seiko Co., Ltd. Figure 1, Sentence 21, Figure 3 ゛3/,. ``Kure E Gate] 2] Figure 4 Drop 2 / Figure 6 Bt 6.) Figure 7 Figure 8 Figure 10 @ Figure 11, // copy / l" 77, Ill

Claims (3)

[Claims] (1) In a tuning fork type crystal resonator that uses torsional vibration, when this resonator is supported by two leads on the same principal surface, the resonator at both widthwise ends of the tuning fork arm of the tuning fork type crystal camera is It is characterized by being supported within the distance between the two straight lines along the length, and the distance of the rod from the point where the extension of the inner straight line intersects with the base end to the widthwise end of the base. A support structure for a tuning fork type crystal camera. (2) A support structure for a tuning fork type crystal resonator according to claim 1, wherein the resonator utilizes elastic coupling of bending vibration and torsional vibration. (3) A support structure for a tuning fork crystal resonator according to claim 2, wherein the vibrator utilizes elastic coupling of fundamental vibrations of bending vibration and torsional vibration.