JPS5818807B2 - Atsumi Beriketsuyoushindoushi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thickness-shear crystal oscillator that does not deteriorate the % performance of the oscillator due to support.

An example of a conventional thickness-shear oscillator is shown in FIGS. 1 and 2.

In FIG. 1, the vibration direction of a rectangular plate vibrator 1 is parallel to the long side direction, a partial electrode 2 is provided at the center of the vibrator 1, and a support 3 is provided at the end in the length direction and the center in the width direction. This shows the case where

FIG. 2 shows a case where the vibration direction and the long side direction are at right angles.

In the conventional thickness-shear vibrator as shown in FIGS. 1 and 2, by arranging partial electrodes 2 and confining the energy there,
The aim is to weaken the vibrations at the point so that even if support is provided there, the characteristics will not deteriorate.

In addition, methods have been taken to further enhance the above-mentioned effects by bevel-cutting the ends in the long side direction or making the cross section plano-compex or convex.

However, in order to create a vibrator with excellent impact resistance, the amount of adhesive and adhesive area had to be adjusted to a certain degree, which inevitably led to a decrease in the Q value of the vibrator. .

In addition, the shape of the resonator is square (for example,
0-22593), there is a structure in which support is provided at two diagonal locations, but in this case, the support positions are not far from the vibrating part, so the negative effect of the support on the characteristics of the vibrator is large. , the equivalent resistance of the resonator becomes high Q
It had the disadvantage of lowering the value.

An object of the present invention is to provide a thickness-shear crystal resonator in which deterioration of the characteristics of the resonator due to support is minimized due to the nature of the shape of the resonator.

Embodiments of the invention will be described below with reference to the drawings.

In FIG. 3, a partial electrode 2 is arranged approximately at the center of a parallelogram-shaped vibrator 1, and two points a1 and d2 far from the electrode are placed.
This is an example in which support 3 was performed.

The direction of vibration is parallel to the long side direction, as shown by the arrow in the figure.

The example in FIG. 4 shows a case where the vibration direction is perpendicular to the long side direction, as indicated by the arrow in the figure.

As shown in FIGS. 3 and 4, by arranging the partial electrode 2 almost at the center of the vibrator, most of the vibration energy is confined there, and the two points a1 and d2 farthest from the electrode 2 The vibration at is the weakest among vibrator 1.

Also, as shown in Figures 3 and 4, the oscillator crystal is located at point b2.
and is cut at point c1.

As a result, the straight line b1. b2 and the straight lines C1 and C2 to the side farther from the electrode 2, vibrations have a property of being difficult to be transmitted.

Therefore, from the point al t 321 dl p d2 of the rectangular vibrator of FIGS. 1 and 2, which have the same length in the long side direction, the end of the present invention shown in FIGS. 3 and 4 It can be said that the vibration strength is weaker at points a1 and 62.

By the way, when an electric field is applied in the thickness direction, in addition to the main thickness shear vibration, spurious hoop vibration may also occur.

This vibration is caused by the center line 01 of the crystal shown in FIGS. 1 and 2.
02 and PQ are nodes of vibration, sides alta2al, d2
and al 1 dl 1 a2 p d2 are two types of standing waves with antinodes of vibration.

In the parallelogram shape of the present invention, as shown in FIGS. 3 and 4, median lines 01, 02 and sides a1. A standing wave cannot be created because b2, cl, and d2 are not parallel.

It can be said that the parallelogram shape of the present invention is superior to the rectangular shape in that it is difficult to create ring vibration, which is unnecessary vibration.

As described above, in the parallelogram-shaped thickness shear crystal vibrator of the present invention, 1) the support position is far from the electrode position of the vibrating section.

2) The strength of vibration at the support position is weaker than that of a general rectangular thickness-shear vibrator.

3) The shape suppresses unnecessary wheel vibration.

It has the above three advantages and has the advantage of suppressing the deterioration of characteristics due to support as much as possible.

By the way, FIG. 5 shows another embodiment of the present invention, in which the shape is approximately a parallelogram, and at two points a and d2 farthest from the partial electrode 2, for convenient attachment of the support 3, Slight portions a1y-a2 and d in the direction perpendicular to the long side direction
, , d2 are provided.

By providing a1@a2, dl, and d2 with a small length, it has a component in the direction perpendicular to the direction of the support line 3 without damaging the above-mentioned %Fl of the parallelogram shape, making it stronger. It has the advantage of being able to support.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a specific example of a conventional thickness-shear crystal resonator, in which the vibration direction is parallel to the long side direction. FIG. 2 similarly shows another conventional example, in which the vibration direction is perpendicular to the long side direction. 3 and 4 are plan views of specific examples of the present invention, in which the vibration direction in the former is parallel to the long side direction, and in the latter at right angles. FIG. 5 is a plan view of another embodiment of the invention. 1 is a thickness-shear crystal oscillator, 2 is a partial electrode, and 3 is a support wire.

Claims (1)

[Claims] 1. An electrode is arranged in the center, and the shape of the plate surface is almost a parallelogram in which the four interior angles are not right angles and the lengths of adjacent sides are different, and the opposite side far from the electrode part is Thickness sliding knot characterized by support at two points on the corner. High vibration element. 2 The electrode is arranged in the center, and the shape of the plate surface is almost a parallelogram in which the four interior angles are not right angles and the lengths of adjacent sides are different, and the two diagonal sides far from the electrode part are A thickness shear crystal oscillator characterized by having a microscopic plane part in a direction perpendicular to the long side of the oscillator and supporting it by these two microscopic plane parts.