JPS58136125A - Coupled crystal oscillator - Google Patents

Abstract

PURPOSE:To decrease the IC value and to improve the workability of an oscillator excellent in vibration-resistance, by forming the oscillation and support sections of a coupled crystal oscillator incorporatedly, and arranging an exciting electrode of the oscillator on the entire upper and lower surfaces of the oscillation section. CONSTITUTION:Two support sections 3 are formed incorporatedly at both sides of the oscillation section 2 of a crystal 1, and exciting electrodes 6, 7 are uniformly arranged on the upper and lower surfaces 4, 5 of the oscillation section 2. This oscillation electrode 6 is prolonged to the one support section 3, the electrode 7 is prolonged to the other support section 3, and an AC voltage is applied to the electrodes 6, 7 to excite the oscillator. The resonance frequency of the two modes is determined basing on the width W and the length L of the oscillator, and the resonance frequency of the main oscillation is determined width W and the resonance frequency of the sub-oscillation is determined basing on the length L. The IC value of the coupled crystal oscillator is reduced and the manufacture in the oscillator excellent in the vibration-resistance is made easy.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrode structure of a so-called coupled crystal resonator in which a vibrating section and a supporting section are integrally formed and a plurality of longitudinal vibration modes are coupled. An object of the present invention is to provide a coupled crystal resonator with excellent frequency-temperature characteristics (hereinafter referred to as temperature characteristics). Another object of the present invention is to use CI (crystal engineering).
edanca) is dedicated to providing small bonded quartz crystals. Another object of the present invention is to provide an electrode structure for a coupled crystal resonator that is easy to work with, particularly an electrode structure that facilitates mounting work.

There are many consumer devices that require resonators with excellent temperature % characteristics and small CI, and AT-cut crystal resonators have been used in these devices. However, recently, various consumer devices have become smaller, and along with this, there has been a demand for smaller AT-cut crystal resonators.
The reality is that miniaturization is difficult due to the large number of tion), and the CI increases when miniaturization is performed. In particular, when using an AT-cut crystal oscillator as a wristwatch crystal oscillator, it is necessary to downsize the VC, and when compared with a tuning fork-type bent crystal oscillator, it is not completely satisfactory in terms of size. . Therefore, recently, a method of forming a vibrator using photolithography, which applies the technique of engineering C, has been applied to the manufacturing of vibrators, and as a result, it has become possible to provide very small vibrators. .

For example, it has been applied to GT-cut quartz crystal oscillators with excellent temperature characteristics that allow the thickness of the oscillator to be extremely thin, making it possible to create extremely small oscillators. However, these GT cant crystal oscillators utilize the combination of two vibration modes, ie, the main vibration and the sub-vibration, in order to achieve good temperature characteristics. Therefore, the temperature characteristics are almost determined by the difference in the resonance frequencies of the main and minor vibrations. Theoretically, it is known how much the difference in resonance frequency should be to support excellent temperature characteristics, but in reality, it is difficult to maintain a constant value due to variations in the structure. Atatsu next because of the cause.

Several methods have been proposed to absorb this variation in temperature characteristics. For example, Japanese Patent Publication No. 47-3508 proposes a method in which the characteristics are adjusted once by removing the excitation electrode, but since the actual electric field efficiency decreases due to the removal of the excitation electrode, C
A problem arises in that Stingray 1 becomes high. Furthermore, since it is supported by a crystal oscillator and two thin lead wires, it is difficult to miniaturize it, and at the same time, it is vulnerable to shocks, and the workability of the mount is often poor. Therefore, the present invention is intended to improve these problems and drawbacks.

Hereinafter, the present invention will be described in detail along one aspect.

FIGS. 1(A) and 1(B) show an example of the shape and electrode of the coupled resonator of the present invention, in which the vibrating part 2 and the two supports s3 arranged in its FikJIIll are integrally formed of a GT cut crystal. This is an example of a camera. fa1 diagram (A) is the top view
Figure (B) shows a side view. On the upper surface 4 and lower UAJ 5 of the vibrating part 2 at a water height of 1, excitation electrodes 6.7 are arranged uniformly over the entire surface.
i1i&, the excitation electrode 6 is disposed extending to one support part 3, and the excitation electrode 7 is disposed to extend to the other support part 5. The electrode extending from the excitation part 2 to the support part 3 is a terminal 1 necessary for applying an electric field! It is extreme. Support part 3
The vibrator can be easily excited by applying an alternating voltage to both extended wires. The resonance frequencies of the two modes are determined by width W and length LK, respectively, @WV
In C, the resonant frequency jW of the main vibration can be determined, and the resonant frequency fL of the auxiliary vibration can be determined depending on the length L. Next, the reason why the excitation electrodes are arranged on the upper and lower surfaces and the entire surface of the imaging 1@S2 will be explained. Fig. 2 (N is determined by nFI!J of the GT-cut crystal camera in which the vibrating part 2 and the supporting part 5 of the present invention are integrally formed. The relationship between the displacement and each position on the cross section A-A. The calculated value is shown. That is, the displacement becomes zero at point C, and from point C to points a and e, h<VC, so the absolute value of displacement increases (ux=uz).

FIG. 2(B) shows the relationship between each INK and distortion. That is, the strain is maximum at point C, and becomes smaller at the ends. However, the second cause (A), (f1
As is clear from Figure 11.3 (A) and <B), the end a
, θ, the distortion does not become zero at 2·′, and a distortion occurs.

This means that the 01 body of the crystal resonator is different depending on whether the excitation electrode is placed at the end of the vibrating section or not.In other words, the excitation electrode is placed at the end of the imaging section. In other words, it is possible to obtain a C f- that is lower than K.

Figure 5 (A), (The layer is a histogram of the distribution of Cll1 when the excitation electrode is placed on the upper and lower surfaces of the imaging section, the entire surface, and when it is placed on a portion (approximately 75 mm of the vibrating section), with experimental values. FIG. 3(A) is a histogram showing the distribution of C1 values for the number n=200 when Fi excitation electrodes are arranged in sections, and the average value X=140fffi.

On the other hand, Fig. 5 (Cl
The histogram showing the distribution of values shows that the CI value can be reduced by about 40% from the average value data 84 (D), and the effect when the excitation electrodes are placed over the entire surface is remarkable. Fourth
Figures (A) and (,B) show a plan view (body) and a side view (CB) of an embodiment of the T-cut crystal camera 9 of the present invention mounted on a support base 8. A crystal resonator 9 is arranged on the support base 8, and the ends 12 and 13 of the resonator are fixed with adhesive, glue, or solder. Excitation electrodes 10° and 11 are arranged on the upper and lower surfaces of the crystal sensor.

Since the crystal resonator 9 is fixed to the support base 8 at both ends, it is possible to provide a crystal resonator with excellent shock resistance. on the side,
By pulling out the electrodes from the imaging section to the support section, mounting work at both ends of the support became easier. Although the crystal camera element 9 has a complicated shape, it can be easily formed using a photo ring 7I. As a result, it has become possible to provide an extremely small crystal camera. Next, temperature characteristics will be explained. The temperature characteristics are determined by the ratio RVC of the width W and the straw length L when the cutting angle is constant, R=
It shows excellent temperature characteristics when R is between 0.90 and (199), and FIG. 5 shows an example according to the present invention when R=[L95.

As described above, the present invention has been able to provide a coupled vibrator with a small CI value by arranging excitation electrodes on the upper and lower surfaces and the entire surface of the moving part of the coupled vibrator. Fourthly, by improving the electrode arrangement, it was possible to firmly fix the structure at the supporting end, thereby providing a coupled vibrator with excellent impact resistance and easy workability. Furthermore, by selecting the side ratio and R, it was possible to provide a coupled resonator with excellent temperature characteristics. Therefore, an image sensor having these characteristics can be applied to consumer equipment, etc., and its industrial value is extremely large.

[Brief explanation of drawings]

#! 1 (A) and (B) respectively show an example of the shape and electrode of the coupled vibrator of the present invention, in which the vibrating part 2 and the two supporting parts 5 disposed on both sides thereof are integrally formed. FIG. 1 is a plan view and a side view showing an example of a GT-cut crystal camera. Figure 2 (A) shows that the vibrating part 2 and the supporting part 3 of the present invention are integrally formed. Position A-displacement l of the GT cut crystal resonator
Samurai drawing Ruru. 2. FIG. 4B) is a graph showing the relationship between distortion and each position of the GT cut crystal resonator of FIG. 2(A). Figure 5 (A) is a histogram of CI values when the excitation electrode is placed on the vibrating part. Figure 5 (B) is the CI value when the excitation electrode is placed on the upper and lower surfaces of the vibrating part. This is a histogram of values. 4(A) and 4(9) are a plan view and a side view, respectively, of an embodiment of the T-cut crystal camera 9 of the present invention mounted on a support base 8. It is a temperature characteristic diagram obtained in °C in one embodiment of the present invention. 1... Crystal 2... Vibrating part 5... Supporting part 4... Top surface 5... Bottom surface 6.7 ...Beyond the excitation electrode
Applicant Daini Seikokai Co., Ltd. Agent Patent Attorney Mogami-10: Figure 1 (Al Figure 1 (B) Figure 2 (A) Figure 2 (δ) Figure 3 (A)
Figure 3 CB) Figure 4 rA1 * 4 @tβfu

Claims (1)

[Claims] (1) A crystalline quartz resonator in which a plurality of longitudinal vibration modes are coupled, the vibrating part and the supporting part of the coupled crystal resonator are integrally formed, and the excitation electrodes of the crystal resonator are arranged on the upper and lower surfaces of the vibrating part,
A coupled crystal oscillator characterized by being arranged over the entire surface. (2. In claim (1), the electrode on the upper surface of the vibrating section extends to the upper surface of one of the supporting sections for power distribution,
The coupled crystal oscillator is characterized in that the electrode on the lower surface of the vibrating section extends 1km below the hydraulic support section.