JPH03291011A - Short-side crystal resonator - Google Patents

Abstract

PURPOSE:To confine the resonance energy within a resonant part and a bent part, to reduce the equivalent series resistance of the vibrator and to improve the shock resistance by integrating the resonant part, a bridge, the bent part, a frame and a support with etching and adopting a new shape. CONSTITUTION:A resonator 1 consists of a resonant part 2, a bent part 3, a bridge 4, a frame 5 and a support 6. Many resonators are formed simultaneously by etching one thin plate crystal plate and exciting electrodes 9, 10 are arranged to upper and lower faces of the part 2. In such a case, the electrodes 9, 10 are formed on the upper and lower faces of the part 2 opposed to each other as different poles and they are prolonged up to a mount 7 of the support 6. Thus, a short-side resonance is caused by applying an alternate voltage between the electrodes 9, 10 and the resonance is displaced in also long side direction. Moreover, since the frame 5 is connected to the support 6 with a hole 8 made thereto, no leakage resonance is caused.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to the shape and excitation of a short-side crystal resonator in which a vibrating part, a bridging part, a bent part, a frame, and a support part are integrally formed by chemical etching. This invention relates to electrode arrangement, and relates to a short-sided 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 and compact.

[Summary of the invention]

The purpose of the present invention is to provide a short-side crystal resonator having very low vibration leakage, low equal series resistance R1, and a high Q value. The support part is formed integrally with the pre-fuji part bending part and the frame by a chemical etching method, and the vibrating part is formed so as to be surrounded by the bending part and the frame. Furthermore, the support part is connected to the approximate center of the frame, and is a short-side crystal oscillator with excitation electrodes arranged on almost the entire top and bottom of the vibrating part, and is supported and fixed to a pedestal etc. by the mount part of the support part. There is. By forming the vibrator in this manner, the object of the present invention is achieved.

[Conventional technology]

As shown in Japanese Patent Application Laid-open No. 53-132988 and Japanese Patent Application No. 53-160737, in conventional short-side crystal resonators, the vibrating part and the supporting part are integrally formed by etching, and the bridging part A method of supporting and fixing to a pedestal or the like was adopted at both ends of the support part in the same direction.

C invention tries to solve the problem! 11! [Problem] As mentioned above, in conventional short-sided crystal resonators, the mounting part is in the same direction as the bridge part, so when it is miniaturized, it is directly affected by the pedestal, which leads to deterioration of electrical characteristics and reduces the amount of energy inside the vibrating part. There remained major problems with miniaturization, such as insufficient confinement and, as a result, vibration leakage.

(Means for Solving 41 Problems) Therefore, the present invention solves the conventional problems by the following method.That is, the vibration part, the bridge part, the bending part, and the frame which are largely displaced in the short side direction. A short-side crystal oscillator consisting of a supporting part, the vibrating part is connected to a bending part via a bridge part, a frame is connected to the bending part so as to surround the vibrating part, and the vibration is damped approximately at the center of the frame. The object of the present invention is achieved by forming the vibrator to include a support portion provided with a hole for allowing the vibration to occur.

[Function] As described above, the short-side crystal resonator of the present invention is composed of a vibrating portion, a bridging portion, a bent portion, a frame, and a supporting portion. As a result, even when downsized, it is not affected by the support pedestal and energy is sufficiently trapped, so it is possible to create a compact, compact, shock-resistant product with a low equal series resistance R1, a high Q value, and A short side crystal resonator is obtained.

〔Example〕

Next, embodiments of the present invention will be specifically described based on the drawings.

FIGS. 1(A) and 1(B) show a plan view (A) and a side view (B) of an embodiment of the shape of the short-side crystal oscillator and the arrangement of the excitation electrodes of the present invention. 2° bent part 3. Purifuji part 4. It is composed of a frame 5 and a support section 6. A large number of these shapes are simultaneously formed from a single thin crystal plate by etching. In addition, excitation electrodes 9 and 10 are arranged on the upper and lower surfaces of the vibrating section 2 (however, not shown in the plan view (A)). They are formed so as to extend to the mount portion 7 of one of the support portions 6. This will describe zero-order vibration leakage that can cause short-side vibration by applying an alternating voltage between the excitation electrodes 9 and 10. The short side vibration also causes displacement in the long side direction.

This displacement is transmitted to the bending section 3 via the bridge section 4 and converted into a bending mode. At this time, the vibrations are slightly transmitted to the frame 5, but since the support part 6 provided with the six 8 is connected to the frame 5, the vibrations of the frame 5 are not transmitted at all, especially to the mount part 7 of the support part 6. First, a short-side crystal resonator with no vibration leakage can be obtained even when it is supported and fixed on a pedestal or the like by the mount portion 6. In other words, most of the vibration energy of the vibrating part 2 is confined within the vibrating part 2 and the bending part 3, and as a result, an equal number of series resistors R1
A short-side crystal resonator with a small Q value and a high Q value can be obtained.

〔Effect of the invention〕

As described above, the present invention proposes a short-side crystal resonator with a new shape in which the vibrating part, pre-fugitive part, bending part, frame and support part are integrally formed by etching.
It has the following remarkable effects.

(2) By selecting the shape of the vibrator, it is possible to confine the vibration energy within the vibrating part and the bending part, so it is possible to obtain a small equal series resistance R2.

■ The vibrating part 1 bridge part, bending part, frame and support part are integrally molded by chemical etching method, so it can be miniaturized.

■ At the same time, it has excellent impact resistance.

(2) Since the support portion is connected to the frame, a short-side crystal resonator with low vibration leakage, low equal series resistance R, and high Q value can be obtained.

■ There is no vibration leakage even when the mount is supported and fixed.
Excellent aging properties.

[Brief explanation of the drawing]

FIGS. 1A and 1B show examples of the short-side crystal resonator shape and excitation electrode arrangement of the present invention, and show a plan view and a side view, respectively. 1... Vibrator 2... Vibrating part 3... Bent part 4... Bridge part 5... Frame 6... Support part 7... Mount part 8... Hole 9.10.・・Excitation electrode

Claims (1)

[Claims] A short-side crystal resonator consisting of a vibrating part that is largely displaced in the short side direction, a bridge part, a bent part, a frame, and a support part, the vibrating part being connected to the bending part via the bridge part, and arranged so as to surround the vibrating part. 1. A short-side crystal resonator, characterized in that the frame is connected to a bending part and comprises a support part having a hole for damping vibrations in the approximate center of the frame.