JPH08240434A - Support structure of vibrator - Google Patents

Abstract

PURPOSE: To bend and vibrate a vibrator in a stable posture by flattening supporting filaments in the axial direction of the vibrator at least in a part except a connecting part to the vibrator. CONSTITUTION: When a vibrator 1 supported by supporting filaments 21a and 21b is bent and vibrated in a necessary amplitude in the Y axis direction by an action of a piezoelectric means, an electromagnetic means or the like, the filaments 21a and 21b are particularly largely deformed in the Z axis direction in flat parts 23a and 23b whose second moment of area is small. The bending moment acting on a connecting part to the vibrator 1 by its filaments 21a and 21b becomes smaller, and deflective deformation generated in its part also becomes smaller. Therefore, pressing force exerted on respective side surfaces of the vibrator 1 by its connecting part of the filaments 21a and 21b also becomes smaller, and component force in the X axis direction and the Z axis direction of respective pressing forces also becomes smaller. Therefore, bending vibration in the Y axis direction of the vibrator 1 is extremely stabilized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibrator support structure used in a vibration gyro and the like, and more particularly to stabilizing the bending vibration posture of the vibrator.

[0002]

2. Description of the Related Art A conventional supporting structure for a vibrator is shown in FIG.
There is one illustrated in a perspective view. Here, one supporting line having a substantially circular cross-section and having, for example, a circular cross-section at a position corresponding to a node or a portion in the vicinity thereof on one ridge line portion 1a of a columnar vibrator 1 made of a constant elastic alloy or the like. The central portion of the strip 2a is connected by welding or the like in a posture in which it is oriented in a direction substantially orthogonal to the ridge line portion 1a, and the ridge line portion 1a
Similarly, the central portion of the other supporting line 2b is connected to the ridge line portion 1b located opposite to the supporting line 2b.
The leg ends of a and 2b are fixed to the support members 3a and 3b. The vibrator 1 thus supported is flexurally vibrated in the Y-axis direction in the figure by the operation of the piezoelectric means, the electromagnetic means, and the like.

[0003]

By the way, in such a conventional technique, when the vibrator 1 bends and vibrates as shown in the enlarged side view of the main part in FIG. As is apparent from the enlarged plan view of the main part of FIG. 5 (b), the beam-shaped portions of 2a and 2b receive a bending moment in the Z-axis direction, which causes vibration of both supporting filaments 2a and 2b. The parts separated from the child connecting part are flexibly deformed in the directions away from each other.

Because of this, even if the belly portion of the vibrator 1 is
For example, as shown in the figure, it is bent in the positive direction of the Y axis
Therefore, each of the supporting filaments 2a and 2b is shown in FIG.
In each of the portions A to D shown by hatching, the vibrator 1
On each side of₁~ F_FourTo exert the power of
It Where these forces F₁~ F_FourBoth are shown in Figure 6.
As shown in the enlarged plan view, the X-axis direction and the Z-axis direction
Each component force F_x1~ F _x4And F_z1~ F_z4Bring
Of these component forces, the component force in the X-axis direction is
Force F_x1And F_x2And component force F_x3And F_x4At least one with
If the other side is out of balance,
And act as a force to rotate it around the Z axis.
As a result, the bending vibration posture of the vibrator 1 becomes unstable,
There is a problem that the vibration direction shifts from the Y-axis direction.
Was.

Further, the component force in the Z-axis direction is, for example, the dimensional error of the supporting wire rods 2a, 2b, the wire rods 2 thereof.
component force F _z1 and F
_When the balance of _z2 and at least one of the component _forces F _z3 and F _z4 is broken, etc., the vibrator 1 also has a bending vibration component in the X-axis direction. 1,
There is a problem that it causes a deviation with respect to a predetermined vibration direction.

Therefore, when such a vibrator 1 is applied to a vibration gyro, serious problems occur in the characteristics of the vibration gyro, such as deterioration of output drift and deterioration of detection accuracy.

By the way, it has been proposed to reduce the above-mentioned forces F _{1 to} F ₄ to reduce the diameter of the supporting wire 2 in order to stabilize the bending vibration posture of the vibrator 1. However, according to this, there is another problem that the supporting strength of the vibrator 1 is likely to be insufficient.

The present invention has been made as a result of studies aimed at solving such problems of the prior art, and the main object of the present invention is to sufficiently secure the support strength of the vibrator. It is another object of the present invention to provide a support structure for a vibrator that effectively reduces the influence of the supporting wire on the flexural vibration of the vibrator and allows the flexural vibration of the vibrator in a stable posture.

[0009]

According to the vibrator support structure of the present invention, a substantially columnar vibrator has a substantially gate shape at a position corresponding to a node or in the vicinity of the ridge of the vibrator.
Preferably, the central portion of the beam portion of the plurality of supporting filaments is connected by welding or the like in a posture in which the beam portion is substantially orthogonal to the ridge portion, and the supporting filament is connected to the vibrator. At least a part except for is flat in the axial direction of the vibrator. Here, the columnar vibrator includes a prismatic vibrator, a cylindrical cylinder, an elliptic cylinder, and a deformed cylinder.

[0010]

The function of the supporting wire is, for example, Z direction in the axial direction of the vibrator.
When flattened in the axial direction by crushing or the like, in the flattened portion, the second moment of area in the Z-axis direction decreases and bending stiffness decreases, while the flattened portion extends in the extending direction and the Z-axis direction. In the direction orthogonal to the respective directions, the second moment of area becomes large and the bending stiffness increases. Therefore, in this support structure in which the supporting wire is flat except for the connecting portion to the vibrator, the bending deformation of the supporting wire in the Z-axis direction due to the bending vibration of the vibrator is By concentrating it on the flat portion thereof, it is possible to sufficiently reduce both the bending moment and the bending deformation amount of the supporting wire in the same direction at the connecting portion to the vibrator.

Thus, the force exerted on each side surface of the vibrator by the connecting portion of the supporting wire to the vibrator is effectively reduced,
Moreover, since the acting directions of these forces approach the Z-axis direction, the respective component forces of each of those forces in the X-axis direction and the Z-axis direction are also effectively reduced. However, the rotational force around the Z-axis that is received from the supporting wire during its bending vibration is small, and the bending vibration force that the vibrator receives in the X-axis direction is also small. Flexural vibration in the axial direction is sufficiently stable.

On the other hand, in the flat portion of the supporting wire, the second moment of area becomes large and the bending stiffness increases with respect to the acting direction of the vibrator weight. It is possible to exhibit excellent supporting strength.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged view of an essential part showing an embodiment of the present invention, in which the same parts as those described in the conventional example are designated by the same reference numerals. Here, a position corresponding to a node on one ridge line portion 1a of a columnar vibrator 1 having a quadrangular cross-sectional shape and made of, for example, a constant elastic alloy or the like, and another position on the opposing ridge line portion 1b of the vibrator 1 are different. Each of the supporting lines 21a, 21b forming a substantially gate-shaped structure as a whole at each of the positions corresponding to the nodes is formed in the central portion of each beam portion thereof in a direction substantially orthogonal to the ridge line portions 1a, 1b. Facing each other, connect them by welding, etc., and further,
a, 21b, the tip of each leg extending in the Y-axis direction,
It is fixed on the support members 3a and 3b. Incidentally, reference numeral 22 in the figure denotes a cushion material arranged between the support members 3a and 3b. Here, in this example, only both end portions of the beam portion extending in the X-axis direction of the supporting filaments 21a, 21b are made flat in the axial direction of the vibrator 1, that is, the Y-axis direction, and the flat portions 23a, 23b thereof are formed. The other parts except for have a circular shape, a square shape, or the like. In the illustrated example, the vibrator 1 is shown in a bent state in which it is convex in the positive direction of the Y axis.
Although the flat portions 23a and 23b and the leg portion of 1b are somewhat flexibly deformed, when the vibrator 1 is stationary, the supporting wire 21
Such flexural deformation does not occur in a and 21b.

By the way, the formation of the flat portions 23a, 23b on the beam portions of the supporting filaments 21a, 21b is carried out, for example, as shown in FIG. Both end portions can be crushed and deformed by the press die 24 to have a substantially rectangular cross-sectional shape, and in this case, by providing the press die 24 with an arcuate notch, the central portion of the beam portion can be obtained. It is also possible to have an arcuate cross section.

According to such a supporting structure, the supporting wire is
When the vibrator 1 supported by 21a, 21b is flexurally vibrated in the Y-axis direction with a required amplitude by the action of piezoelectric means, electromagnetic means, etc., the supporting wire rods 21a, 21b have a second moment of area of area. The small flat portions 23a and 23b are particularly deformed in the Z-axis direction, so that the supporting filaments 21a and 21b are deformed.
The bending moment acting on the connecting portion to the vibrator 1 becomes small, and the bending deformation occurring at that portion also becomes small.

Therefore, the pressing force exerted on each side surface of the vibrator 1 by the connecting portion of the supporting wires 21a and 21b is reduced, and the component force of each pressing force in the X-axis direction and the Z-axis direction is also reduced. In addition, when the flexural vibration of the vibrator 1 is caused, the rotational force around the Z axis exerted on the vibrator 1 by the supporting wires 21a and 21b is effectively reduced.
The bending vibration force in the axial direction is also effectively reduced,
The bending vibration in the Y-axis direction becomes extremely stable.

With respect to the bending vibration of the vibrator 1 in the Y-axis direction, since the flat portions 23a and 23b of the supporting wires 21a and 21b have a large second moment of area, the flat portions 23a and Although the supporting strength of 23b in the Z-axis direction is somewhat reduced, the supporting filaments 21a and 21b can support the vibrator 1 with sufficient strength.

FIG. 3 is a view showing another embodiment of the present invention, in which not only both end portions of the beam portions of the supporting wires 21a and 21b but also the upper end portions of their legs are hooked. The flat portions 23a and 23b are formed in a continuous shape.

Also in this embodiment, the vibrator 1 is set to Y
When it is flexurally vibrated in the axial direction, like the above-described embodiment,
The bending deformation in the Y-axis direction is concentrated on each flat portion 23a, 23b, the bending moment acting on the connecting portion of the supporting wire 21a, 21b to the vibrator 1 is reduced, and the bending deformation generated there is also generated. Since the amount is also small, the supporting wire
The rotational force exerted on the vibrator 1 by the transducers 21a and 21b around the Z-axis is effectively reduced, and the bending vibration force of the transducer 1 in the X-axis direction is also effectively reduced. The bending vibration posture of becomes extremely stable.

In this case, since the flat portions 23a and 23b of the supporting wires 21a and 21b have a wide width in each of the Y-axis direction and the X-axis direction, the flat portions 23a and 23b are not affected by a force in either direction. Can also exert sufficient stiffness, and therefore
The supporting wires 21a and 21b can support the vibrator 1 with sufficient strength.

Although the above invention has been described with reference to the illustrated example, the flat portions of the supporting wires 21a and 21b may be continuously provided from the end portion of the beam portion thereof to the tip of the leg portion. It is also possible to form only the legs.

[0022]

As described above, according to the present invention, the action of force in an unintended direction due to the supporting wire of the vibrator 1 in the flexural vibration state can be effectively prevented, and the flexural vibration posture of the vibrator can be effectively prevented. Can be stabilized sufficiently. Therefore, when the vibrator to which this support structure is applied is used for the vibration gyro, the output drift is stabilized, the detection accuracy is improved, and the accuracy of the vibration gyro can be greatly improved.

[Brief description of drawings]

FIG. 1 is an enlarged side view and a plan view of an essential part showing an embodiment of the present invention.

FIG. 2 is a diagram showing an example of forming a flat portion of a supporting wire.

3A and 3B are an enlarged side view and a plan view of an essential part showing another embodiment of the present invention.

FIG. 4 is a perspective view showing a conventional example.

5A and 5B are an enlarged side view and a plan view of a main part of a conventional example.

FIG. 6 is a diagram showing a component force acting on each part.

[Explanation of symbols]

 1 Transducer 1a, 1b Ridge part 3a, 3b Support member 21a, 21b Support wire 23a, 23b Flat part 24 Press type

Claims (1)

[Claims] 1. A central portion of a substantially linear supporting line at a position corresponding to a node or in the vicinity of the position of a ridge portion of a substantially columnar vibrator is substantially orthogonal to the ridge portion. A supporting structure for a vibrator, which is connected in the direction of the vibration, wherein the supporting wire is flat in the axial direction of the vibrator in at least a part excluding the connecting portion to the vibrator. Support structure.