JPH11160073A - Piezoelectrically vibrating gyro - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a piezoelectrically vibrating gyro whose productivity is enhanced, which is small and whose reliability is increased. SOLUTION: A piezoelectrically vibrating gyro is provided with a bending vibrator 1, with a circuit board 7, for drive detection, which detects an acceleration according to the vibration of the bending vibrato and with a support and fixation base 8 which is used to support the bending vibrator. The circuit board 7 for drive detection and the support and fixation base 8 are integrated and molded by a three-dimensional injection molding operation so as to become a molded component comprising a three-dimensional wiring pattern 11. The bending vibrator 1 and the circuit board 7 for drive detection are connected by using the three-dimensional wiring pattern 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a piezoelectric vibrating gyroscope, and more particularly, to a piezoelectric vibrating gyroscope using a rod-shaped bending vibrator.

[0002]

2. Description of the Related Art In general, a gyroscope is used in a camera shake prevention mechanism and an automobile navigation system used in a camera-integrated VTR. being called.

The piezoelectric vibrating gyroscope utilizes a mechanical phenomenon in which when an angular velocity is applied to a vibrating body (piezoelectric vibrator), a Coriolis force is generated in a direction perpendicular to the vibration direction. Now, consider a vibration system that can vibrate in two directions orthogonal to each other. When this vibrating system is excited in one direction and an angular velocity is applied to the vibrator itself with an axis parallel to a line that intersects the vibrating surface in two directions as the center axis, the vibration in the direction orthogonal to the excitation due to the aforementioned Coriolis force Occurs.

When the piezoelectric vibrator is used, if the input voltage used for excitation is constant, the magnitude of the added angular velocity can be obtained from the magnitude of the output voltage.

Here, a piezoelectric vibrator for a piezoelectric vibrating gyroscope will be described with reference to FIG.

The piezoelectric vibrator shown in FIG. 6 includes a columnar piezoelectric ceramic body 1, a driving electrode 2 is provided on a side surface of the piezoelectric ceramic body 1, and a detection electrode 3 is provided.
And 4 and a ground electrode 5 are provided. And
Polarization has been applied between electrodes 2, 3, and 4 and electrode 5. The piezoelectric vibrator 1 is supported at the nodes 6 at both ends, and performs bending vibration in accordance with a voltage applied to the driving electrode 2. Therefore, the piezoelectric vibrator 1 is also called a bending vibrator.

FIG. 7 shows a conventional piezoelectric vibrator unit for a piezoelectric vibrating gyroscope using the above-described piezoelectric vibrator. Referring to FIG. 7, piezoelectric vibrator 1 is supported by insulating holder 18, and insulating holder 18 is inserted into recess 19 of circuit board 17 and adhered by an adhesive. After the insulating holder 18 is inserted into the circuit board 17, the conductor 21 of the insulating holder 18 and the conductor 24 of the circuit board 17 are electrically connected by soldering or the like.

The piezoelectric vibrator 1 described with reference to FIG. 6 is disposed on the insulating holder 18 by rubber-like soft elastic supporting parts 20a and 20b, and the supporting parts 20a and 20b support the nodes of the piezoelectric vibrator 1. doing. The support components 20a and 20b are, for example, a resin that is fluid before curing and becomes a rubber-like elastic body after curing.

Next, the conductor 21 of the insulating holder 18 and the electrodes 2, 3, 4, and 5 of the piezoelectric ceramic 1 are connected by the input / output lead wire 22. An electronic component 23 such as a capacitor is mounted between the circuit conductor patterns on the circuit board 17.

[0010]

By the way, in the conventional piezoelectric vibrating gyroscope, the supporting and fixing bases for supporting the drive detecting circuit board and the bending vibrator are separated from each other. That is,
Two molded parts are used as the support fixture. Therefore, when electrically connecting the support fixture to the circuit board, the support fixture and the circuit board are bonded, and then the conductors of the support fixture and the circuit board are electrically connected by solder welding or the like. There is a need to. That is, in the case of the conventional piezoelectric vibrating gyroscope, there is a problem that the production is troublesome.

In addition, in the conventional piezoelectric vibrating gyroscope, as described above, a rubber-like resin molded body is used as a supporting component, but there is a problem that the shape of the supporting component after curing of the resin is not uniform. As a result, there is a problem that the support between the insulating holder and the bending vibrator is not constant and various characteristics such as a detection sensitivity and a phase characteristic of the piezoelectric vibrating gyroscope are adversely affected.

An object of the present invention is to provide a piezoelectric vibrating gyroscope that can be easily manufactured.

It is another object of the present invention to provide a piezoelectric vibrating gyroscope having excellent characteristics such as detection sensitivity and phase characteristics.

[0014]

According to the present invention, there is provided a piezoelectric vibrating gyroscope having a bending oscillator, a circuit board for drive detection, and a support base for supporting the bending oscillator. Circuit board and the support base are integrated by an injection molded body having a three-dimensional wiring pattern, and the bending oscillator and the drive detection circuit board are connected using the three-dimensional wiring pattern. Thus, a piezoelectric vibrating gyroscope is obtained.

[0015] For example, the support fixture is located above the drive detection circuit board, and a terminal portion is formed on the three-dimensional wiring pattern in the support fixture, and the terminal portion is formed using the terminal portion. The terminal and the bending oscillator are connected by an input / output lead wire.

Further, a part of the three-dimensional wiring pattern is spread over the front and back surfaces of the drive detection circuit board at an end of the drive detection circuit board to form a surface mount component type terminal. You may. In this case, it is desirable to have at least two embosses formed on a mounting surface of the drive detection circuit board, which are used for positioning when the drive detection circuit board is mounted on an external circuit board.

Further, a rubber-like supporting component is attached to the supporting and fixing base, and the node of the bending vibrator is supported by the supporting component. In this case, the supporting component is mounted on the supporting and fixing base. A groove for inserting and supporting is formed.

In addition, a rubber-like support component is attached to the support-fixing table. When the support component supports the node of the bending vibrator, a recess is formed in the support component to form the support-fixer. A platform may be fitted in the recess.

[0019]

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

The piezoelectric vibrating gyroscope according to the present invention includes the piezoelectric vibrator described with reference to FIG. As described above, the illustrated piezoelectric vibrator includes the columnar piezoelectric ceramic body 1, and the driving electrode 2 is disposed on the side surface of the piezoelectric ceramic body 1 as shown in FIG. 3
And 4 and a ground electrode 5 are provided. And
A polarization treatment is performed between the electrodes 2, 3, and 4 and the electrode 5. This piezoelectric vibrator bends and vibrates according to the voltage applied to the driving electrode 2.

FIG. 1 is an external perspective view of a piezoelectric vibrating gyroscope according to the present invention. Referring to FIG. 1, a circuit board 7 and a support base 8 are formed by so-called three-dimensional injection molding. That is, the circuit board 7 and the support fixture 8 are resin molded articles integrally formed by three-dimensional injection molding.
A three-dimensional wiring pattern 11 is formed on the front surfaces of the circuit board 7 and the support fixture 8.

Referring also to FIG. 2, as described above, the three-dimensional wiring pattern 11 is formed on the upper surface of the support fixing base 8, and the terminal 9 is defined by the three-dimensional wiring pattern 11. In the illustrated example, the terminals 9 are formed at four places, and the lead wires 22 are welded from the terminals 9 to the respective electrodes 2, 3, 4, and 5 of the bending oscillator 1, and the three-dimensional wiring pattern 11 is formed. The bending oscillator 1 is electrically connected.

Referring to FIG. 1, a land 10 is formed on the circuit board 7 and the support base 8, and this land 10
Is provided with a through hole connecting the front surface and the back surface of the circuit board 7 (or the supporting and fixing base 8), and a conductor film (conductor) is formed on the inner surface of the through hole. Therefore, when the connection between the front surface and the back surface of the circuit board 7 is connected, the front surface and the back surface of the circuit board 7 are connected by the land 10, and an electronic component (not shown) is also mounted on the land 10 and soldered. Is done.
On the back surface of the circuit board 7, pin terminals 12 for connection to an external circuit (not shown) are provided. In the illustrated example, they are provided at four locations on the circuit board 7.

As shown in FIG. 2, a supporting part for supporting the bending oscillator 1 is used. A groove 15 is formed in the support fixing base 8, and the support component 14 is inserted into the groove 15. Specifically, a back part 15 ′ is formed on the support component 14, and the projection 1 is formed on a surface facing the back part 15 ′.
6 are formed. The support component 14 is formed of a rubber-like resin, and the back 1
5 'is inserted. Then, the protrusion 16 of the support component 14
To support the node of the bending oscillator 1 so that the vibration state of the bending oscillator 1 is not impaired. The back part 1 of the support component 14
The corner of 5 'is formed at an obtuse angle.

The support component 14 cannot be formed together with the support fixture by three-dimensional injection molding because of the difference in material from the support fixture 8, and as described above, the support component 14 is formed on the support fixture 8 in a later step. combine.

FIG. 3 shows another example of the supporting fixture and the supporting parts. In the illustrated example, a recess 25 is formed in the support component 14 ′, and the support fixture 8 ′ is mounted in the recess 25. Since the inner diameter of the recess 25 is slightly smaller than the outer diameter of the support fixing base 8 ′, the support fixing base 8 ′ can be firmly attached to the recess 25. This support part 14 '
Is formed of a rubber-like resin similarly to the support component 14, and a projection 16 is formed on a surface facing the recess 25. The projection 16 of the support component 14 'supports the node of the bending oscillator 1 so that the vibration state of the bending oscillator 1 is not impaired. Note that the corners of the support fixture 8 'are machined at an obtuse angle.

Referring to FIGS. 4A and 4B, as the circuit board 7, for example, the circuit board shown in FIGS. 4A and 4B may be used. In the illustrated example, the circuit board 7 is provided with a surface mount type terminal (SMD terminal) 13. That is, in the illustrated example, the surface-mounted terminals 13 are formed by extending the conductors of the wiring pattern 11 and extending from the front surface to the rear surface at both ends of the circuit board 7.
Such a surface mount type terminal 13 is formed by three-dimensional injection molding (MI
It can be easily formed by the three-dimensional wiring pattern according to D).

Further, the circuit board 7 shown in the figure has a convex emboss 16 formed on the rear surface thereof. When the circuit board 7 is mounted on another circuit board, the emboss 16 is aligned with the position and direction. Used as a mark. The emboss 16 is also formed by three-dimensional injection molding (MID). The height of the emboss 16 is a house circle with a height of about 0.5 to 1 mm, and is formed at, for example, two places on the back surface of the circuit board 7.

When the circuit boards shown in FIGS. 4A and 4B are used, a piezoelectric vibrating gyroscope shown in FIG. 5 is obtained. In the piezoelectric vibrating gyroscope shown in FIG. 5, since the surface mounting type terminals 13 are provided, the pin terminals 12 shown in FIG. 1 are not required. In FIG. 5, other components are the same as those of the piezoelectric vibrating gyroscope shown in FIG.

[0030]

As described above, according to the present invention, the circuit board and the support fixture having a complicated shape are formed by three-dimensional injection molding (M).
(ID), so that not only the number of parts can be reduced but also the productivity is improved, and a small, highly reliable and inexpensive piezoelectric vibrating gyroscope can be obtained.

Further, if a three-dimensional wiring pattern is used,
Surface mount (SMD) terminals can also be easily formed,
Further, there is an effect that downsizing and reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an external appearance of an example of a piezoelectric vibrating gyroscope according to the present invention.

FIG. 2 is a perspective view partially showing the appearance of a supporting fixture and supporting components used in the piezoelectric vibrating gyroscope shown in FIG. 2;

FIG. 3 is a perspective view partially showing an appearance of a support fixing base and a support component (concave shape) used in the piezoelectric vibrating gyroscope shown in FIG. 2;

4A and 4B are diagrams showing a circuit board used for the piezoelectric vibrating gyroscope shown in FIG. 2, wherein FIG. 4A is a cross-sectional view of the circuit board,
(B) is a plan view showing the appearance of the circuit board.

FIG. 5 is a perspective view showing an external appearance of an example of a piezoelectric vibrating gyroscope having an SMD type terminal according to the present invention.

FIG. 6 is a perspective view showing the appearance of a piezoelectric vibrator.

FIG. 7 is a perspective view showing the appearance of a conventional piezoelectric vibrating gyroscope.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 piezoelectric vibrator (flexing vibrator) 2 drive electrode 3, 4 detection electrode 5 ground electrode 6 node 7, 17 circuit board 8 support fixture 9 terminal 10 land 11 three-dimensional wiring pattern 12 pin terminal 13 surface mounting Mold (SMD) terminal 14, 20a, 20b Supporting component 15 Groove 15 'Back 16 Projection 18 Insulating holder 19 Recess 21, 24 Conductor 22 Input / output lead wire 23 Electronic component 25 Concave portion

Claims (6)

[Claims] 1. A bending oscillator, a drive detection circuit board,
In the piezoelectric vibrating gyroscope having a support fixed base for supporting the bending vibrator, the drive detection circuit board and the support fixed base are integrated by an injection molded body having a three-dimensional wiring pattern, A piezoelectric vibrating gyroscope, wherein the bending vibrator and the drive detection circuit board are connected using a three-dimensional wiring pattern. 2. The piezoelectric vibrating gyroscope according to claim 1, wherein the support fixture is located above the drive detection circuit board, and a terminal portion is provided on the three-dimensional wiring pattern in the support fixture. Is formed, and the terminal portion and the bending vibrator are connected by input / output lead wires using the terminal portion. 3. The piezoelectric vibrating gyroscope according to claim 1, wherein a part of the three-dimensional wiring pattern spreads over an upper surface and a lower surface of the drive detection circuit board at an end of the drive detection circuit board. A piezoelectric vibratory gyroscope characterized by forming a surface-mounted component type terminal. 4. The piezoelectric vibratory gyroscope according to claim 3, wherein the drive detection circuit board is used for positioning when the drive detection circuit board is mounted on an external circuit board, and is formed on a mounting surface of the drive detection circuit board. A piezoelectric vibrating gyroscope having two embosses. 5. The piezoelectric vibrating gyroscope according to claim 1, wherein a rubber-like supporting component is attached to the support fixing stand, and the supporting component supports a node of the bending vibrator. A piezoelectric vibrating gyroscope, wherein a groove for inserting and supporting the support component is formed in the support fixing base. 6. The piezoelectric vibrating gyroscope according to claim 1, wherein a rubber-like support component is attached to the support fixing base, and the support component supports a node of the bending vibrator. A piezoelectric vibrating gyroscope, wherein a concave portion is formed in the support component, and the support fixing base is fitted in the concave portion.