JPH0310507A - Bending crystal resonator - Google Patents

Abstract

PURPOSE:To realize a comparatively high frequency in the bending mode by constituting a vibration part with two rods, providing a support not suppressing the vibration at both ends and forming them integrally with the etching method. CONSTITUTION:A vibrator 1 consists of a vibration part 2, a support part 3, via a bridge part 4 and they are formed integrally with the etching method. When the same frequency as a tuning fork bending crystal resonator is obtained, the length of the rods is doubled and a longer shape than a conventional tuning fork is obtained. In order to make the vibration of the bending part 5 sufficiently free, a hole 7 is provided. Then the vibration of the vibrator part 2 in the direction of the bridge 4 is very small but vibrated in the bending mode and the hole 7 is connected to the frame 6 and prolonged to the mount part 8, then the energy of the vibration part is not delivered to the frame 6 and the bending crystal vibrator with no vibration leakage is obtained even when a lead wire or the like is fixed to the mount part 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bent crystal resonator having a low frequency of 50 KHz to 500 KHz. In particular, it relates to the resonator shape and excitation electrode arrangement, and relates to a bent crystal resonator that is optimal as a reference signal source for portable devices such as IC cards and pagers, which are required to be ultra-thin.[Summary of the Invention] The present invention The object of the present invention is to provide a bending crystal resonator having a low frequency of 50 to 500 Hz, very little vibration leakage, and a small equivalent series resistance R. To achieve this, the vibrating section is shaped like a rod, and the two rods are connected at the center of the rod. In other words, an H-shaped vibrator is formed in which the vibrating portion has two tuning fork shapes. In addition, a support part that does not suppress the vibration of the vibrating part is formed at both ends of the center of each rod via a bridge part, and the vibrating part and the support part are integrally formed by an etching method. It is a child.

[Conventional technology]

A tuning fork-type bent crystal resonator is an example of a low-frequency resonator, but to further increase the frequency, harmonic vibration must be used, which makes the excitation electrode arrangement complicated and the electrical characteristics Problems such as an increase in the capacitance ratio, which is one of the
, it was very difficult to obtain a vibrator with a small series resistance R1 of equal number. Further, when considering the frequency of a tuning fork type bent crystal resonator at a mass production level, the highest frequency is about 200 KHz, and the bent crystal resonator of the present invention with a frequency of 500 Hz has not yet been put into practical use.

[41 Problems to be Solved by the Invention] As stated above, there is a limit to increasing the frequency with the conventional tuning fork type bent crystal resonator, and at the same time, the equal series resistance R9 increases and the capacitance ratio increases. There were many problems such as.

[Means to solve the problem]

Therefore, the present invention solves the conventional problems by the following method. That is, it is a bent crystal resonator in which a vibrating part and a supporting part are integrally formed by an enching method, and the vibrating part of the vibrating part has a shape of two rods, and the vibrating parts are connected at the center thereof, and The object of the present invention is achieved by configuring the vibrator so that both ends of each vibrating part are connected to the bent part of the support part through the bridge part and connected to the frame through both ends of the hole. There is.

[Effect]

In this way, the bending crystal resonator of the present invention has two rod-shaped vibrating parts, and furthermore, support parts that do not suppress vibration are provided at both ends of the vibrating parts, and these parts are integrally formed by an etching method. Therefore, there is no vibration leakage, miniaturization is possible, and at the same time, a relatively high frequency with a small equal series resistance R1, a high Q value, and a small capacitance ratio can be realized in the bending mode.

〔Example〕

Next, the present invention will be specifically described.

FIG. 1 is a plan view of one embodiment of the bending crystal resonator of the present invention, and the top view showing the arrangement method of the excitation ti of the vibrating section 2 is the second embodiment.
It is a diagram. The vibrator 1 is composed of a vibrating part 2 and a support part 3 via a bridge part 4, and is integrally formed by an etching method. The vibrating section 2 vibrates in a bending vibration mode, as indicated by solid and broken arrows a and a' in the plan view of FIG.

Furthermore, since the two rods are connected at the central portion 9 of the rod of the vibrating section 2, this is essentially equivalent to forming two tuning fork shapes.

That is, when this resonator obtains the same frequency as a tuning fork type bent crystal resonator, the rod length is twice as long, and it can be made longer than the conventional tuning fork shape. In other words, when shortening the vibrating part 2 to increase the frequency, it is necessary to make the vibrating part 2 longer (than the tuning fork shape).
Therefore, the frequency can be increased without causing deterioration of the equal number of series resistors R5. It goes without saying that the bending mode can be obtained by applying an alternating voltage to both terminals A and B in FIG. Both ends of the vibrating section 2, which has two rod shapes, are connected to a bent section 5 of the support section via a bridge section 4, and are integrally formed by an etching method. Further, a hole 7 is provided in order to allow the bending portion 5 to sufficiently vibrate. Furthermore, both ends of the hole are connected to the frame 6 and extend to the mount section 8. Therefore, the vibration of the vibrating part 2 in the direction of the bridge part 4 is very small, but it vibrates in the bending mode.
In addition, since it is connected to the frame 6 through both ends of the hole and extends to the mount part 8, the energy of the vibrating part is not transmitted to the frame 6, and even if it is supported and fixed to a lead wire etc. by the mount part 8, there is no vibration at all. A bent crystal resonator without leakage can be obtained.

〔Effect of the invention〕

As described above, the present invention provides a bent crystal resonator in which the vibrating part and the supporting part are integrally formed by etching.
By proposing a new-shaped bent crystal fine oscillator consisting of two vibrating portions, the following remarkable effects can be achieved.

(2) By using two vibrating arms in the vibrating section, the electric field efficiency is improved, and as a result, a bent crystal resonator having a small equal series resistance R2, a high Q value, and a small capacitance ratio can be obtained.

(2) By improving the shape of the support part, the vibration of the vibrating part can be made free without being suppressed, so that the equal series resistance R8 can be reduced.

■ Since there is a hole between the bent part and the frame, the vibrating part can vibrate freely, and at the same time, the energy of the bent part is not transmitted to the frame, eliminating vibration leakage and fixing it with the mount part. Even if the equivalent series resistance R1
A small bent crystal resonator can be obtained.

■ Since it is mounted on one side, it is easy to manufacture and can be made smaller.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the shape of the bending crystal resonator of the present invention;
FIG. 2 is a top view showing one embodiment of the excitation 1t8i of the present invention.・Vibrator・Vibration part・Support part・Bridge part・Bending part・Frame・Hole・Mount part・Central part B...Electrode terminal

Claims (1)

[Claims] This is a bent crystal resonator in which a vibrating part and a supporting part are integrally formed by an etching method. A bent crystal resonator characterized in that both ends of the part are connected to the bent part of the support part through a bridge part and connected to the frame through both ends of the hole.