JPH05322581A - Oscillation gyroscope - Google Patents

Abstract

PURPOSE:To make it possible to measure and adjust the resonance frequency of a vibrator readily by containing terminal electrodes, which are formed on a supporting plate and electrically connected to the vibrator and, holes around which connecting electrodes are provided, and which are connected to the terminal electrodes. CONSTITUTION:When the resonance frequency of a vibrator is adjusted in an oscillation gyroscope 10, measuring devices are connected to terminal electrodes 36a-36c of a supporting plate 28. In this way, the resonance frequency of the vibrator 12 can be simply measured and adjusted. At this time, the supporting plate 28, on which the vibrator 12 is supported and the peripheral circuits such as an oscillating circuit and a detecting circuit, which are electrically connected to the vibrator 12, are independently manufactured so that these parts can be assembled. Therefore, the resonance frequency of the vibrator can be readily measured and adjusted without the effects of the parts of these peripheral circuits. Namely, in this oscillation gyroscope 10, the resonance frequency when the vibrator 12 is regarded as the single body can be correctly obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration gyro,
In particular, for example, it relates to a vibration gyro used in a navigation system mounted on an automobile.

[0002]

2. Description of the Related Art FIG. 5A is a perspective view showing an example of a conventional vibrating gyro, and FIG. 5B is a circuit diagram thereof.
The vibrating gyro 1 includes a vibrator 2. Oscillator 2 is 3
Including the prismatic vibrating body 3, the three side surfaces of the vibrating body 3 are
Piezoelectric elements 4a, 4b and 4c are respectively formed.
Two support members 5a and 5b made of a material such as nickel are attached to the ridge portion of the vibrating body 3. The two support members 5a and 5b are fixed near the node points of the vibrating body 3 by soldering or welding. Further, the two support members 5a and 5b are fixed to the mounting substrate 6 by a method such as soldering. This 2
The two support members 5a and 5b are for supporting the vibrating body 3 on the mounting substrate 6 in a vibrating manner.

A printed board (not shown), for example, is formed below the mounting board 6. Peripheral circuits such as an oscillation circuit for driving the vibrator 2 and a detection circuit for detecting displacement of the vibrator 2 are formed on the printed board. These peripheral circuits and the vibrator 2 are electrically connected. The mounting substrate 6 and the printed circuit board are integrally fixed with, for example, an adhesive.

One piezoelectric element 4c of the vibrator 2 is shown in FIG.
As shown in (B), it is electrically connected to the input end of the oscillation circuit 7, and the output end of the oscillation circuit 7 is connected to the other two piezoelectric elements 4.
It is electrically connected to a and 4b. Therefore, the vibrator 2 is self-excited. Further, the two piezoelectric elements 4a and 4b are electrically connected to the two input ends of the detection circuit 8 including, for example, a differential amplifier. Therefore,
The output of the detection circuit 8 detects the rotational angular velocity of the vibration gyro 1.

[0005]

A conventional vibrating gyro 1
Then, usually, the vibrator 2 is, for example, a case (not shown).
It is built in and stored in. Further, in the conventional vibrating gyro 1, since the mounting substrate 6 and the printed circuit board are integrated, when measuring and adjusting the resonance frequency of the vibrator 2, for example, the components of the peripheral circuit formed on the printed circuit board. Under the influence of, it was difficult to correctly measure the resonance frequency of the vibrator 2. In other words, it is difficult for the conventional vibration gyro 1 to grasp the resonance frequency when the vibrator 2 is viewed as a single unit.

However, in order to prevent the influence of the peripheral circuit, the mounting substrate 6 and the printed circuit board are removed before the vibrator 2 is assembled in the case, and the electric connection between the vibrator 2 and the peripheral circuit is made at one end. Disconnect. Further, for example, lead wires were connected to the three piezoelectric elements 4a, 4b and 4c of the vibrator 2, and the resonance frequency of the vibrator 2 was measured and adjusted. And after adjusting the resonance frequency,
Again, those lead wires were removed, the mounting substrate 6 and the printed circuit board were electrically connected and integrated, and they were housed in the case. As described above, in the conventional vibration gyro 1, it is very troublesome to accurately measure and adjust the resonance frequency of the vibrator 2.

Therefore, the main object of the present invention is not to be affected by the peripheral circuit electrically connected to the vibrator, and moreover, even after the vibrator is incorporated, the resonance frequency of the vibrator can be easily adjusted. Can be measured and adjusted,
It is to provide a vibrating gyro.

[0008]

The present invention provides a vibrator,
A vibrating gyroscope including a support plate that supports the vibrator, a terminal electrode formed on the support plate and electrically connected to the vibrator, and a hole that is connected to the terminal electrode and around which a connection electrode is provided. Is.

[0009]

Function: The vibrator is supported by the support plate. The vibrator and the terminal electrode are electrically connected. Therefore, the resonance frequency characteristic of the vibrator is measured by electrically connecting, for example, a measuring device to the terminal electrode. Also, on the support plate,
For example, when mounting a circuit board having a peripheral circuit such as an oscillation circuit for vibrating the vibrator and a detection circuit for detecting the displacement of the vibrator, the support plate and the circuit board are connected through a hole. .. Further, by electrically connecting the connection electrode formed on the peripheral portion of the hole and the vibrator, the vibrator and the peripheral circuit are electrically connected.

[0010]

According to the present invention, the resonance frequency of a vibrator can be easily measured without being affected by peripheral circuits electrically connected to the vibrator and even after the vibrator is incorporated. A vibrating gyro that can be adjusted by

The above-mentioned objects, other objects, features and advantages of the present invention will become more apparent from the detailed description of the following embodiments with reference to the drawings.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1A is a partially cutaway perspective view showing an embodiment of the present invention, and FIG. 1B is a side view thereof. FIG. 2 is an exploded perspective view of the vibrating gyro shown in FIG. 3 is a perspective view of a main part of the vibration gyro shown in FIG. 1, and FIG. 4 is a circuit diagram of the vibration gyro shown in FIG.

The vibrating gyro 10 includes a vibrator 12. As shown in FIG. 3 in particular, the vibrator 12 includes a vibrating body 14 having, for example, a triangular cross section and a columnar shape. This vibrating body 14
Is formed of a constant elastic metal material such as nickel, iron, chromium, titanium or an alloy thereof such as elimba or iron-nickel alloy. The vibrating body 14 may be formed of a material other than a metal that generally causes mechanical vibration, such as quartz, glass, crystal, or ceramic.

As shown in FIG. 4, the vibrating body 14 includes
Piezoelectric elements 16a, 16b and 16c are fixed to approximately the centers of the three side surfaces. These piezoelectric elements 1
Each of 6a to 16c includes a piezoelectric layer 18 made of, for example, a piezoelectric ceramic, and electrodes 20a and 20b are formed on both main surfaces of the piezoelectric layer 18, respectively. And
Electrodes 20 on one main surface of these piezoelectric elements 16a to 16c
a is bonded to the side surface of the vibrating body 14 with, for example, a conductive adhesive. In this embodiment, the two piezoelectric elements 16a are
And 16b are used for driving for vibrating or driving the vibrating body 14 and for detecting for detecting the displacement of the vibrating body 14, and another piezoelectric element 16c drives two piezoelectric elements 16a and 16b. It is used as a feedback for returning a signal.

The vibrator 12 is supported by two support members 22a and 22b, particularly as shown in FIGS. Each of the support members 22a and 22b is formed in a U shape by a wire material such as metal. Then, the central portions of the support members 22a and 22b are fixed to one ridge portion of the vibrating body 14 sandwiched by the two piezoelectric elements 16a and 16b. In this case, the support members 22a and 2a
2b is fixed near the node point of the vibrating body 14 in order to make it difficult for the vibration of the vibrating body 14 to be adversely affected. In this embodiment, assuming that the length of the vibrating body 14 is L, these support members 22a and 22b are fixed at positions of 0.224L from both ends of the vibrating body 14.

These support members 22a and 22b are
The vibrating body 14 is fixed to the vibrating body 14 by, for example, bonding with an adhesive, soldering, or welding. However, when the vibrating body 14 is fixed by soldering or welding, the strength of the supporting member and the supporting member for the vibrating body are fixed. Considering both the solderability and weldability of molybdenum,
It is possible to form a supporting member with a wire material that is coated with a material having good solderability and weldability such as nickel, platinum, gold, silver, copper, stainless steel, and iron around a metal wire having high strength such as titanium. preferable.

As shown in FIGS. 1, 2 and 3, the both end portions of the support members 22a and 22b are mounted on a mounting board 24 made of a metal material such as iron, nickel or stainless steel, which is substantially rectangular, for example. Fixed. That is, two holes (not shown) are formed in each of the mounting substrates 24. And one support member 22a
Both end portions are inserted into the two holes of the one mounting substrate 24 and soldered. Similarly, the other support member 22b
Both end portions are inserted into the two holes of the other mounting substrate 24 and soldered.

Further, as shown in FIGS. 1, 2 and 3, the mounting substrate 24 is fixed on one main surface of the support plate 28 by a cushioning member 26 made of an elastic sheet such as a rubber foam. It The mounting substrate 24 is fixed to a position closer to one end side in the width direction than the center of the support plate 28 in the width direction. That is, the vibrator 12 is supported on the one main surface by the support plate 28 together with the mounting substrate 24 via the cushioning material 26. The support plate 28 includes, for example, a rectangular face member 30, and protrusions 32 and 34 are formed at one end and the other end of the face member 30 in the longitudinal direction, respectively. Each of the protrusions 32 and 34 is formed at a position closer to one end side than the center of the surface member 30 in the width direction. These face members 30, protrusions 32 and 34 are
For example, it is integrally formed of a magnetic and conductive material such as iron, nickel, and stainless.

Further, on one main surface of the support plate 28, seven strip-shaped terminal electrodes 3 made of metal, for example, are formed at a position closer to the other end side than the center in the width direction.
6a, 36b, 36c, 36d, 36e, 36f and 36g are formed. These terminal electrodes 36a to 36g
Are formed at intervals in the longitudinal direction of the support plate 28.
Each of these terminal electrodes 36a to 36g is formed to extend from the other end of the support plate 28 in the width direction to the center of the support plate 28 in the width direction.

Further, on the one main surface of the support plate 28, there are, for example, seven holes 38a, 38b, 38c, 38 at approximately the center thereof and spaced in the longitudinal direction of the support plate 28.
d, 38e, 38f and 38g are provided. Ring-shaped connection electrodes 40a, 40b, 40 made of, for example, metal are provided around the peripheries of these holes 38a-38g, respectively.
c, 40d, 40e, 40f and 40g are formed. These connection electrodes 40a-40g are connected to the tip portions of the terminal electrodes 36a-36f, respectively.

A sheet-shaped cushion material 42 is adhered to the other main surface of the support plate 28 with an adhesive. The cushion material 42 is formed to have substantially the same size and shape as the support plate 28. The cushion material 42 is formed of a material in which rubber such as butyl rubber or synthetic resin such as urethane is foamed so as not to be connected to each other, that is, so-called independent foaming.

On one main surface side of the support plate 28, as shown in FIGS. 1 and 2, a relay member 46 made of, for example, metal.
a, 46b, 46c, 46d, 46e, 46f and 4
A rectangular circuit board 44 having a hybrid IC, for example, is attached via 6g. In this case, the relay member 4 is inserted into the holes 38a to 38g of the support plate 28, respectively.
6a, 46b, 46c, 46d, 46e, 46f and 46g are inserted and soldered to the connection electrodes 40a-40g, respectively.

Since the relay members 46a to 46g have the same structure, one relay member 46a will be described. The relay member 46a includes, for example, a rectangular relay substrate 48a. The relay board 48a has, for example, a U-shaped holding portion 50a formed at one end in the longitudinal direction, and a strip-shaped terminal portion 52a formed at the other end in the longitudinal direction. In this case, the holding portion 50a is formed so that one end thereof is orthogonal to one end in the longitudinal direction of the relay board 48a. The terminal portion 52a is formed extending from the other end of the relay board in the longitudinal direction in parallel with the main surface of the relay board. Holding part 50a
Is for sandwiching one end in the width direction of the circuit board.

One end in the width direction of the circuit board 44 is sandwiched between the sandwiching portions 50a to 50g of the relay members 48a to 48g and soldered, so that the circuit board 44 is fixed to the relay members 48a to 48g. Further, the relay member 48a
~ 48g, those terminal portions 52a ~ 52g is the support plate 2
8 of the holes 38a to 38g, and the terminal portions 52a to 52g thereof are soldered to the connection electrodes 40a to 40g at the peripheral edges of the holes 38a to 38g, respectively, thereby being fixed to the support plate 28. Therefore, the circuit board 44 is fixed to the support plate 28 while being floated from the one main surface of the support plate 28 by the relay members 48a to 48g.

On the other hand, the electrodes 20b on the other main surface of the three piezoelectric elements 16a to 16c have lead wires 54a,
One end of 54b and 54c is soldered. Also,
One end of each of the lead wires 54a, 54b and 54c is connected to the electrode 20b and the vibrating body 14 by an elastic adhesive 56 such as silicon having an effect of damping vibration.
Stuck to. Further, the other end of the lead wire 54a has
As shown in FIG. 6, the other end of the lead wire 54b is connected to the conductor pattern 58a, and the other end of the lead wire 54c is connected to the conductor pattern 58b provided on the other main surface side of the support plate 28. Connected to. in this case,
Since the conductor patterns 54a, 54b and 54c are connected to the connection electrodes 40a, 40b and 40c, respectively, the lead wires 54a, 54b and 54c are electrically connected to the terminal electrodes 38b, 38a and 38c, respectively. Further, the ground pattern 60 provided on the other main surface side of the support plate 28 is electrically connected to the terminal electrode 36g by being connected to the connection electrode 40g.

The support plate 28 surrounds the vibrator 12 and the circuit board 44, and is, for example, a frame member 6 having a rectangular plane shape.
2 is attached. As shown in FIG. 2, the frame member 62 includes, for example, a U-shaped front member 64, and two protrusions 66 a and 6 are provided on both sides of the lower end of the front member 64.
6b is formed. The front surface member 64 has, for example, a rectangular side surface member 68 extending at right angles from both ends in the longitudinal direction,
68 are formed respectively. These side members 68, 6
Two projecting portions 70a and 70b are formed at the upper end of 8 at intervals in the longitudinal direction thereof. Further, two protrusions 72a and 72b are formed on both sides of the lower ends of the side members 68, 68, respectively. A rectangular back member 74, for example, is formed between the two side members 68. At the upper end of the back member 74, there are two protrusions 76a spaced apart in the longitudinal direction.
And 76b are formed. The front member 64, the protrusions 66a and 66b, the two side members 68, and the protrusion 70
a, 70b, 72a, 72b, back member 74, protrusion 7
6a and 76b are integrally formed of, for example, a synthetic resin material.

In the frame member 62, one end side of the support plate 28 in the width direction is locked between the two protrusions 66a and 66b of the front member 64, and between the protrusions 72a and 72b of the two side members. The end portions of the projecting portions 32 and 34 of the support plate 28 are respectively locked to. In this case, the lower ends of the four sides of the frame member 62 and the peripheral ends of the four sides of the support plate 28 are fixed to each other with an adhesive, for example.

Further, the lid member 7 is provided on the upper end of the frame member 62.
8 is attached. The lid member 78 includes a rectangular main surface member 80, and the main surface member 80 has two holes 82 corresponding to the adjusting screws of the variable resistor provided on the circuit board 44.
a and 82b are formed. Two protrusions 84 and 86 are formed at both ends in the longitudinal direction of the main surface member 80 at intervals in the width direction thereof. The lid member 78 is covered on the frame member 62 so that the protrusion 86 thereof is held between the projecting portions 70a and 70b of the frame member 62, and is bonded by, for example, an adhesive.

On the other hand, on the circuit board 44, the oscillation circuit 88 and the detection circuit 90 shown in FIG. 3 are mounted. Oscillation circuit 8
Reference numeral 8 is for driving or vibrating the vibrator 12, and includes a crystal for stabilizing the oscillation frequency and a phase correction circuit for adjusting the oscillation frequency. The input terminal of the oscillator circuit 88 has a terminal electrode 36c, a connection electrode 40c and a conductor pattern 58, as shown in FIGS.
the electrode 2 of the piezoelectric element 16c of the vibrator 12 via
It is electrically connected to 0b. The output terminal of the oscillator circuit 88 is divided by the variable resistor 92a and connected to the electrodes 20b of the piezoelectric elements 16b and 16a via the terminal electrodes 36a and 36b, the connection electrodes 40a and 40b, the conductor patterns 58a and 58b, etc., respectively. To be done.

The detection circuit 90 is for detecting the displacement of the vibrator 12, and is composed of, for example, a differential amplifier. The two input ends of the detection circuit 90 are connected to the terminal electrode 3
6a and 36b, connection electrodes 40a and 40b, conductor patterns 58a and 58b, etc.
Electrodes 20b of 6b and 16a are respectively connected.

Further, as shown in FIG. 2, two variable resistors 92a and 92b are mounted on the circuit board 44.
The one variable resistor 92a distributes the output of the oscillation circuit 88 to the piezoelectric elements 16a and 16b in a well-balanced manner. Further, the other variable resistor 92b is connected to the detection circuit 90.
It is for adjusting the level of the input signal input to the input terminal, and is connected between the two input terminals of the detection circuit 90 as shown in FIG. Further, another variable resistor (not shown) for adjusting the level of the output signal of the detection circuit 90.
Are connected between the output end of the detection circuit 90 and ground.

Further, the support plate 28 has a structure shown in FIGS.
As shown in, the vibrator 12, the circuit board 44, the frame member 62
And the cover member 78 and so on, for example, iron,
A box-shaped case 94 made of a material having magnetism and conductivity such as nickel or stainless is attached. This case 94 has an opening 94a at its lower end, and has two holes 96a at its upper end for adjusting the adjusting screws of the variable resistors 92a and 92b from the outside, corresponding to the adjusting screws. And 96b are formed. Further, the case 94 is formed with two projecting pieces 98 on both sides of the lower end in the width direction. In this case, the case 94 is attached to the support plate 28 by bending the two protruding pieces 98 to the other main surface side of the support plate 28 and soldering the bent portions. In this way, the vibrator 12, the circuit board 44, the relay members 46a to 46g, the frame member 62, the lid member 78, and the like are housed in the case 94.

In this vibrating gyro 10, the relay members 46a to 46g are formed in the holes 38a to 38g formed in the support plate 28.
By inserting g and soldering the terminal portions 52a to 52g to the connection electrodes 40a to 40g, the circuit board 44 can be easily attached and housed in the case 94. Therefore, this vibration gyro 1
In No. 0, the vibrator 12 and the circuit board 44 can be manufactured separately, and they can be combined in a compact manner via the relay members 46a to 46g.

Further, in the vibrating gyroscope 10, when adjusting the resonance frequency of the vibrator 12, the resonance of the vibrator 12 can be easily performed by connecting the measuring device to the terminal electrodes 36a to 36g of the support plate 28. The frequency can be measured and adjusted. In this case, the support plate 28 supporting the vibrator 12 and the peripheral circuits such as the oscillation circuit 88 and the detection circuit 90 electrically connected to the vibrator 12 are
Since they are manufactured separately so that they can be combined, the vibrator 1 is not affected by the peripheral circuit components.
The resonant frequency of 2 can be easily measured and adjusted. That is, in this vibrating gyroscope 10, the vibrator 12
It is possible to correctly grasp the resonance frequency when viewed as a single unit.

In the above-described embodiment, the vibrating body 14 of the vibrator 12 is formed to have a triangular cross section.
May have a quadrangular or polygonal cross section.
In addition, the piezoelectric element may be formed on at least two adjacent non-parallel side surfaces of the vibrating body.

[Brief description of drawings]

FIG. 1A is a perspective view showing an embodiment of the present invention, and FIG. 1B is a side view solution thereof.

FIG. 2 is an exploded perspective view of the vibration gyro shown in FIG.

FIG. 3 is a perspective view of a main part of the vibrating gyro shown in FIG.

FIG. 4 is a circuit diagram of the vibration gyro shown in FIG.

5A is a perspective view showing an example of a conventional vibration gyro, and FIG. 5B is a circuit diagram thereof.

[Explanation of symbols]

 10 vibrating gyro 12 vibrator 14 vibrating body 16a-16c piezoelectric element 22a, 22b support member 32 support plate 36a-36g terminal electrode 38a-38g hole 40a-40g connection electrode 44 circuit board 46a-46g relay member

Claims (1)

[Claims] 1. A vibrator, a support plate for supporting the vibrator, a terminal electrode formed on the support plate and electrically connected to the vibrator, and a connection electrode connected to and around the terminal electrode. A vibrating gyro including a hole provided with.