JPH07174568A - Driving detection circuit for piezoelectric vibrating gyro - Google Patents

Driving detection circuit for piezoelectric vibrating gyro

Info

Publication number
JPH07174568A
JPH07174568A JP5322088A JP32208893A JPH07174568A JP H07174568 A JPH07174568 A JP H07174568A JP 5322088 A JP5322088 A JP 5322088A JP 32208893 A JP32208893 A JP 32208893A JP H07174568 A JPH07174568 A JP H07174568A
Authority
JP
Japan
Prior art keywords
temperature
voltage
circuit
piezoelectric vibrator
drive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP5322088A
Other languages
Japanese (ja)
Inventor
Nagayuki Ono
長幸 小野
Hiroshi Abe
洋 阿部
Kikuo Tsuruga
紀久夫 敦賀
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tokin Corp
Original Assignee
Tokin Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tokin Corp filed Critical Tokin Corp
Priority to JP5322088A priority Critical patent/JPH07174568A/en
Publication of JPH07174568A publication Critical patent/JPH07174568A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To always stably detect a driving operation with high accuracy while detection sensitivity does not depend on a temperature by applying a temperature-compensation driving voltage to a piezoelectric vibrator with a temperature-compensation circuit. CONSTITUTION:A temperature-compensation circuit 18 temperature-compensates a driving voltage from a phase shift circuit 12, it generates a temperature- compensation driving voltage, and it applies the temperature-compensation driving voltage to a piezoelectric vibrator. The temperature-compensation driving voltage which is generated by the circuit 18 is obtained in such a way that the driving voltage is temperature-compensated according to a variable portion due to a temperature change in a detection voltage. In this case, the mechanical sharpness of the piezoelectric vibrator is changed accompanying the temperature change. Even when the detection voltage which is output from the piezoelectric vibrator is made variable by the temperature change, the temperature- compensation driving voltage which is generated by compensating the variable portion by using the circuit 18 is applied to the piezoelectric vibrator. Consequently, the detection voltage which is obtained from the piezoelectric vibrator can be kept always definite.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、圧電振動子の超音波振
動を利用すると共に、自励発振回路により圧電振動子を
自励振駆動する圧電振動ジャイロ用駆動検出回路に関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive detection circuit for a piezoelectric vibrating gyro, which utilizes ultrasonic vibration of a piezoelectric vibrator and drives the piezoelectric vibrator by self-excited oscillation circuit.

【0002】[0002]

【従来の技術】従来、圧電振動ジャイロは、船舶,自動
車等の移動体に搭載される機器類の姿勢を制御する制御
装置や、自動車のナビゲーションシステム等の幅広い分
野で用いられている。一般に圧電振動ジャイロは、振動
している物体に回転角速度が与えられると、その振動方
向と直角な方向にコリオリ力を生じるという力学現象を
利用したジャイロスコープに属する。
2. Description of the Related Art Conventionally, a piezoelectric vibrating gyro has been used in a wide range of fields such as a control device for controlling the posture of equipment mounted on a moving body such as a ship or an automobile and a navigation system for an automobile. Generally, a piezoelectric vibrating gyro belongs to a gyroscope that utilizes a mechanical phenomenon in which a Coriolis force is generated in a direction perpendicular to the vibration direction when a rotating angular velocity is applied to a vibrating object.

【0003】この圧電振動ジャイロを構成する圧電振動
子は、互いに直交する2つの方向の励振とその検出とが
可能であるように構成した振動系において、一方の入力
側で振動を励振した状態で圧電振動子自体を回転させる
と、上述したコリオリ力の作用によって、この振動と直
角な方向に力が働き、他方の出力側で振動が励振され
る。ここで、出力側に励振される振動の大きさは、入力
側の振動の大きさ及び圧電振動子の回転角速度に比例す
る。そこで、入力側における振動励振のための入力電圧
(駆動電圧)を一定にした状態で、出力側から得られる
出力電圧(検出電力)の大きさを検出すると、回転角速
度の大きさを求めることができる。
The piezoelectric vibrator constituting this piezoelectric vibrating gyro is a vibrating system configured so that it can excite in two directions orthogonal to each other and can detect it. In a vibrating system, vibration is excited at one input side. When the piezoelectric vibrator itself is rotated, a force acts in a direction perpendicular to the vibration due to the action of the Coriolis force described above, and the vibration is excited on the other output side. Here, the magnitude of vibration excited on the output side is proportional to the magnitude of vibration on the input side and the rotational angular velocity of the piezoelectric vibrator. Therefore, when the magnitude of the output voltage (detection power) obtained from the output side is detected with the input voltage (driving voltage) for vibration excitation on the input side being constant, the magnitude of the rotational angular velocity can be obtained. it can.

【0004】図3は、圧電振動ジャイロに用いられる圧
電振動子の概略構造を示したもので、同図(a)はその
斜視図、同図(b)はその中央部における断面図であ
る。
3A and 3B show a schematic structure of a piezoelectric vibrator used in a piezoelectric vibrating gyro. FIG. 3A is a perspective view thereof, and FIG. 3B is a sectional view of a central portion thereof.

【0005】この圧電振動子では、円柱状圧電セラミッ
クス1の外周面上の円周を6等分する位置であって、そ
の長さ方向と平行な位置には6個の帯状電極2〜7が形
成されている。但し、帯状電極2〜7のうち、円周に沿
って1つおきに位置する帯状電極2,4,6の両端は、
アース用接続電極8a,8bに接続されている。これら
の電極は、円柱状圧電セラミックス1の側曲面にスクリ
ーン印刷により直接形成するか、或いはメッキ等を全面
に形成した後に電極の不要部分をフォトエッチングによ
り除去することで製造される。
In this piezoelectric vibrator, six strip-shaped electrodes 2 to 7 are provided at positions that divide the circumference on the outer peripheral surface of the cylindrical piezoelectric ceramic 1 into six equal parts and are parallel to the length direction. Has been formed. However, of the strip-shaped electrodes 2 to 7, both ends of the strip-shaped electrodes 2, 4 and 6 located every other one along the circumference are
It is connected to the ground connection electrodes 8a and 8b. These electrodes are directly formed on the side curved surface of the cylindrical piezoelectric ceramic 1 by screen printing, or are formed by plating the entire surface and then removing unnecessary portions of the electrodes by photoetching.

【0006】この圧電振動子では、6個の帯状電極2〜
7のうち、円周に沿う1つおきの帯状電極2,4,6が
アース用として、1個の帯状電極3が駆動用として、更
に残りの2個の帯状電極5,7が検出用として構成され
る。このような構成の圧電振動子では、駆動用帯状電極
3に円柱状圧電振動セラミック1の共振周波数に等しい
周波数で一定の駆動電圧を印加することで、円柱状圧電
セラミックス1が屈曲振動し、検出用帯状電極5,7か
ら圧電振動子の回転角速度に比例した検出電圧が得られ
る。
In this piezoelectric vibrator, six strip electrodes 2 to
Of the seven, every other strip-shaped electrode 2, 4, 6 along the circumference is for grounding, one strip-shaped electrode 3 is for driving, and the remaining two strip-shaped electrodes 5, 7 are for detection. Composed. In the piezoelectric vibrator having such a configuration, by applying a constant driving voltage to the driving strip electrode 3 at a frequency equal to the resonance frequency of the cylindrical piezoelectric vibrating ceramic 1, the cylindrical piezoelectric ceramic 1 flexurally vibrates and is detected. A detection voltage proportional to the angular velocity of rotation of the piezoelectric vibrator is obtained from the strip electrodes 5 and 7.

【0007】図4は、圧電振動ジャイロに用いられる駆
動検出回路の基本構成を示したブロック図である。この
駆動検出回路は、差動増幅回路19,加算増幅回路2
1,同期検波回路20,及び移相回路22から構成され
る。
FIG. 4 is a block diagram showing the basic structure of a drive detection circuit used in a piezoelectric vibration gyro. This drive detection circuit includes a differential amplifier circuit 19 and an addition amplifier circuit 2.
1, a synchronous detection circuit 20, and a phase shift circuit 22.

【0008】ここで、圧電振動子として構成された円柱
状圧電セラミックス1の検出用帯状電極5,7から得ら
れる2系統の検出電圧は加算増幅回路21に入力され、
合成されて加算電圧として出力される。加算増幅回路2
1からの加算電圧は移相回路22に入力され、移相回路
22では円柱状圧電セラミックス1の共振周波数に等し
い周波数の一定の駆動電圧を駆動用帯状電極3に印加す
る。これらの加算増幅回路21及び移相回路22は、円
柱状圧電セラミックス1の屈曲振動の共振周波数で発振
する自励発振回路として機能する。
Here, two systems of detection voltages obtained from the detection strip electrodes 5 and 7 of the cylindrical piezoelectric ceramic 1 configured as a piezoelectric vibrator are input to the summing amplification circuit 21,
The combined voltage is output as an added voltage. Summing amplifier circuit 2
The added voltage from 1 is input to the phase shift circuit 22, and in the phase shift circuit 22, a constant drive voltage having a frequency equal to the resonance frequency of the cylindrical piezoelectric ceramic 1 is applied to the drive strip electrode 3. The addition amplification circuit 21 and the phase shift circuit 22 function as a self-excited oscillation circuit that oscillates at the resonance frequency of the bending vibration of the cylindrical piezoelectric ceramic 1.

【0009】又、検出用帯状電極5,7から得られる2
系統の検出電圧は同時に差動増幅回路19に入力され、
差動増幅回路19からは圧電振動子の回転角速度に比例
した振幅の交流電圧が出力される。差動増幅回路19か
らの交流電圧と加算増幅回路21からの加算電圧とは、
それぞれ同期検波回路20に入力される。同期検波回路
20では、圧電振動子の回転方向に応じた極性を有し、
且つその回転角速度に比例した直流電圧を出力端子Pへ
出力する。
2 obtained from the strip electrodes 5 and 7 for detection
The detection voltage of the system is simultaneously input to the differential amplifier circuit 19,
The differential amplifier circuit 19 outputs an AC voltage having an amplitude proportional to the rotational angular velocity of the piezoelectric vibrator. The alternating voltage from the differential amplification circuit 19 and the added voltage from the addition amplification circuit 21 are
Each is input to the synchronous detection circuit 20. The synchronous detection circuit 20 has a polarity according to the rotation direction of the piezoelectric vibrator,
A DC voltage proportional to the rotation angular velocity is output to the output terminal P.

【0010】[0010]

【発明が解決しようとする課題】ところで、一般に圧電
振動子の機械的尖鋭度Qは温度変化に伴って変化する。
これにより、図4に示した圧電振動ジャイロ用駆動検出
回路では、駆動電圧が一定でもその温度変化に伴って圧
電振動子から出力される検出電圧が変化し、この結果、
圧電振動ジャイロの検出感度が温度の影響を受けて不安
定になり易い。
By the way, generally, the mechanical sharpness Q of the piezoelectric vibrator changes with the temperature change.
As a result, in the piezoelectric vibration gyro drive detection circuit shown in FIG. 4, even if the drive voltage is constant, the detection voltage output from the piezoelectric vibrator changes with the temperature change.
The detection sensitivity of the piezoelectric vibration gyro tends to be unstable due to the influence of temperature.

【0011】具体的に云えば、駆動用帯状電極の入力電
圧が一定であっても、高温状態においては機械的尖鋭度
Qが小さくなり、これに伴って圧電振動子からの検出電
圧も小さくなる。この結果、圧電振動ジャイロの検出感
度が鈍化されてしまう。更に、低温状態ではこの逆とな
って圧電振動子からの検出電圧が大きくなり、この結
果、圧電振動ジャイロの検出感度が鋭敏化されてしま
う。即ち、このように圧電振動ジャイロの検出感度は温
度変化に依存して不安定になる。
Specifically, even if the input voltage of the driving strip electrode is constant, the mechanical sharpness Q becomes small in a high temperature state, and the detection voltage from the piezoelectric vibrator also becomes small accordingly. . As a result, the detection sensitivity of the piezoelectric vibration gyro is weakened. Further, in the low temperature state, the opposite is true, and the detection voltage from the piezoelectric vibrator increases, and as a result, the detection sensitivity of the piezoelectric vibration gyro becomes sharp. That is, as described above, the detection sensitivity of the piezoelectric vibration gyro becomes unstable depending on the temperature change.

【0012】本発明は、かかる問題点を解消すべくなさ
れたもので、その技術的課題は、検出感度が温度に依存
せず、常時安定して高精度に検出を行い得る圧電振動ジ
ャイロ用駆動検出回路を提供することにある。
The present invention has been made to solve the above problems, and its technical problem is to provide a drive for a piezoelectric vibration gyroscope whose detection sensitivity does not depend on temperature and can always perform stable and highly accurate detection. It is to provide a detection circuit.

【0013】[0013]

【課題を解決するための手段】本発明によれば、圧電振
動子から得られる検出電圧を合成して加算電圧として出
力する加算増幅回路と、加算電圧を入力して圧電振動子
の共振周波数に等しい周波数の駆動電圧を出力する移相
回路とを含む圧電振動ジャイロ用駆動検出回路におい
て、駆動電圧を温度補償して温度補償駆動電圧を生成す
ると共に、該温度補償駆動電圧を圧電振動子に印加する
温度補償回路が設けられた圧電振動ジャイロ用駆動検出
回路が得られる。
According to the present invention, a summing amplifier circuit for synthesizing detection voltages obtained from a piezoelectric vibrator and outputting the summed voltage, and a summing voltage as an input to the resonance frequency of the piezoelectric vibrator. In a piezoelectric vibration gyro drive detection circuit including a phase shift circuit that outputs a drive voltage of equal frequency, the drive voltage is temperature-compensated to generate a temperature-compensated drive voltage, and the temperature-compensated drive voltage is applied to the piezoelectric vibrator. A piezoelectric vibration gyro drive detection circuit provided with a temperature compensation circuit is provided.

【0014】又、本発明によれば、上記圧電振動ジャイ
ロ用駆動検出回路において、温度補償回路は、検出電圧
の温度変化に伴う可変分に応じて駆動電圧を温度補償す
るこで温度補償駆動電圧を得る圧電振動ジャイロ用駆動
検出回路が得られる。
According to the present invention, in the above-mentioned piezoelectric vibration gyro drive detection circuit, the temperature compensation circuit temperature-compensates the drive voltage in accordance with the variable amount of the detected voltage due to the temperature change. A drive detection circuit for a piezoelectric vibrating gyroscope is obtained.

【0015】[0015]

【作用】本発明の圧電振動ジャイロ用駆動検出回路は、
従来の駆動検出回路において加算増幅回路及び移相回路
で構成された自励発振回路に対し、更に検出電圧の温度
変化に伴う可変分に応じて駆動電圧を温度補償するため
の温度補償回路を付加している。従って、この駆動検出
回路では圧電振動子の機械的尖鋭度Qが温度変化に伴っ
て変化することにより、圧電振動子から出力される検出
電圧が温度変化によって可変する場合でも、その可変分
を温度補償回路で補って生成した温度補償駆動電圧を圧
電振動子に印加しているので、圧電振動子から得られる
検出電圧は常に一定に保たれる。
The piezoelectric vibration gyro drive detection circuit of the present invention is
In the conventional drive detection circuit, a temperature compensation circuit is added to the self-excited oscillation circuit that is composed of a summing amplification circuit and a phase shift circuit to further compensate the drive voltage according to the change of the detected voltage due to temperature change. is doing. Therefore, even if the detection voltage output from the piezoelectric vibrator changes due to the temperature change because the mechanical sharpness Q of the piezoelectric vibrator changes with the temperature change in this drive detection circuit, the variable amount is Since the temperature-compensated drive voltage supplemented by the compensation circuit is applied to the piezoelectric vibrator, the detection voltage obtained from the piezoelectric vibrator is always kept constant.

【0016】[0016]

【実施例】以下に実施例を挙げ、本発明の圧電振動ジャ
イロ用駆動検出回路について、図面を参照して詳細に説
明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A piezoelectric vibration gyro drive detection circuit according to the present invention will be described in detail below with reference to the drawings.

【0017】図1は、本発明の一実施例に係る圧電振動
ジャイロ用駆動検出回路の基本構成を示したブロック図
である。
FIG. 1 is a block diagram showing the basic structure of a piezoelectric vibration gyro drive detection circuit according to an embodiment of the present invention.

【0018】この駆動検出回路では、圧電振動子として
構成された円柱状圧電セラミックス1の検出用帯状電極
5,7から得られる2系統の検出電圧を合成して加算電
圧として出力する加算増幅回路11と、この加算電圧を
入力して圧電振動子の共振周波数に等しい周波数の駆動
電圧を出力する移相回路12と、この駆動電圧を温度補
償して温度補償駆動電圧を生成すると共に、この温度補
償駆動電圧を圧電振動子に印加する温度補償回路18と
によって自励発振回路が構成されている。ここで、温度
補償回路18によって生成される温度補償駆動電圧は、
検出電圧の温度変化に伴う可変分に応じて駆動電圧を温
度補償して得られたものである。因みに、温度補償回路
18は入力端子16及び出力端子17間に挿入されてい
る。
In this drive detection circuit, a summing amplifier circuit 11 that synthesizes two systems of detection voltages obtained from the detection strip electrodes 5 and 7 of the cylindrical piezoelectric ceramics 1 configured as a piezoelectric vibrator and outputs as a summed voltage. A phase shift circuit 12 that inputs the added voltage and outputs a drive voltage having a frequency equal to the resonance frequency of the piezoelectric vibrator; and temperature-compensates the drive voltage to generate a temperature-compensated drive voltage. A self-excited oscillation circuit is configured by the temperature compensation circuit 18 that applies a drive voltage to the piezoelectric vibrator. Here, the temperature compensation drive voltage generated by the temperature compensation circuit 18 is
This is obtained by temperature-compensating the drive voltage according to the variable amount of the detected voltage due to the temperature change. Incidentally, the temperature compensation circuit 18 is inserted between the input terminal 16 and the output terminal 17.

【0019】又、この駆動検出回路は、検出用帯状電極
5,7から得られる2系統の検出電圧を入力し、圧電振
動子の回転角速度に比例した振幅の交流電圧を出力する
差動増幅回路9と、差動増幅回路9からの交流電圧と加
算増幅回路11からの加算電圧とを入力し、圧電振動子
の回転方向に応じた極性で、且つその回転角速度に比例
した直流電圧を出力端子Pに出力する同期検波回路10
とを備えている。
Further, the drive detection circuit is a differential amplifier circuit which inputs two systems of detection voltages obtained from the detection strip electrodes 5 and 7 and outputs an AC voltage having an amplitude proportional to the rotational angular velocity of the piezoelectric vibrator. 9, the AC voltage from the differential amplifier circuit 9 and the added voltage from the additive amplifier circuit 11 are input, and a DC voltage having a polarity according to the rotation direction of the piezoelectric vibrator and proportional to the rotation angular velocity is output terminal. Synchronous detection circuit 10 for outputting to P
It has and.

【0020】尚、円柱状圧電セラミックス1には、図3
に示したように、その外周面にアース用帯状電極2,
4,6と、駆動用帯状電極3と、検出用帯状電極5,7
が形成されている。
The cylindrical piezoelectric ceramic 1 has a structure shown in FIG.
As shown in FIG.
4, 6 and drive strip electrode 3 and detection strip electrode 5, 7
Are formed.

【0021】この駆動検出回路の場合、圧電振動子の機
械的尖鋭度Qが温度変化に伴って変化することにより、
圧電振動子から出力される検出電圧が温度変化によって
可変する場合でも、その可変分を温度補償回路18で補
って生成した温度補償駆動電圧を圧電振動子(圧電セラ
ミックス円柱1の駆動用帯状電極3)に印加しているの
で、圧電振動子から得られる検出電圧は常に一定に保た
れることになる。
In the case of this drive detection circuit, the mechanical sharpness Q of the piezoelectric vibrator changes with the temperature change.
Even when the detected voltage output from the piezoelectric vibrator varies depending on the temperature change, the temperature-compensated drive voltage generated by compensating for the variable amount by the temperature compensation circuit 18 is applied to the piezoelectric vibrator (the driving strip electrode 3 of the piezoelectric ceramic cylinder 1). ), The detection voltage obtained from the piezoelectric vibrator is always kept constant.

【0022】図2は、この駆動検出回路における温度補
償回路18の回路構成を示したものである。この温度補
償回路18は、温度上昇によりその抵抗値が大きく変化
するサーミスタ13と、このサーミスタ13に直列に接
続された抵抗14,及びサーミスタ13に並列に接続さ
れた抵抗15とから構成されている。ここで、例えばサ
ーミスタ13における抵抗値の温度係数を負であるよう
に設定すれば、抵抗14,15における抵抗値の温度係
数は正となるように設定されれば良い。
FIG. 2 shows a circuit configuration of the temperature compensation circuit 18 in this drive detection circuit. The temperature compensating circuit 18 is composed of a thermistor 13 whose resistance value greatly changes due to temperature rise, a resistor 14 connected in series with the thermistor 13, and a resistor 15 connected in parallel with the thermistor 13. . Here, for example, if the temperature coefficient of the resistance value of the thermistor 13 is set to be negative, the temperature coefficient of the resistance value of the resistors 14 and 15 may be set to be positive.

【0023】即ち、この温度補償回路18において、サ
ーミスタ13及び抵抗14,15の時定数を適切に選択
し、これらの抵抗値に任意の温度変化に対応する可変値
を持たせることで、温度補償回路18の入力端子16の
駆動電圧が一定の場合でも出力端子17からの温度補償
駆動電圧を温度変化に応じて任意に可変させることがで
きる。
That is, in the temperature compensating circuit 18, the time constants of the thermistor 13 and the resistors 14 and 15 are appropriately selected, and the resistance values of these thermistors 13 and 15 have variable values corresponding to arbitrary temperature changes. Even if the drive voltage of the input terminal 16 of the circuit 18 is constant, the temperature-compensated drive voltage from the output terminal 17 can be arbitrarily changed according to the temperature change.

【0024】例えば、温度上昇により圧電振動子からの
検出電圧が降下する傾向にある場合には、温度補償回路
18を構成するサーミスタ13の抵抗値をその温度上昇
によって小さくなるようにしておけば、これによって駆
動用帯状電極3を介して圧電振動子に印加される温度補
償駆動電圧が増大し、圧電振動子からの検出電圧を上げ
ることができる。又、温度降下により圧電振動子からの
検出電圧が増加する傾向にある場合には、温度補償回路
18を構成するサーミスタ13の抵抗値をその温度降下
によって大きくなるようにしておけば、これによって駆
動用帯状電極3を介して圧電振動子に印加される温度補
償駆動電圧が減少し、圧電振動子からの検出電圧を下げ
ることができる。
For example, when the detected voltage from the piezoelectric vibrator tends to drop due to the temperature rise, if the resistance value of the thermistor 13 constituting the temperature compensating circuit 18 is reduced by the temperature rise, As a result, the temperature compensating drive voltage applied to the piezoelectric vibrator via the driving strip electrode 3 increases, and the detection voltage from the piezoelectric vibrator can be increased. If the detected voltage from the piezoelectric vibrator tends to increase due to the temperature drop, the resistance value of the thermistor 13 forming the temperature compensating circuit 18 may be increased by the temperature drop to drive it. The temperature compensating drive voltage applied to the piezoelectric vibrator via the band-shaped electrode 3 is reduced, and the detection voltage from the piezoelectric vibrator can be lowered.

【0025】このように、この駆動検出回路では、圧電
振動子の検出電圧が温度によって変化する場合でも、そ
の出力の可変分を温度補償して生成した温度補償駆動電
圧で圧電振動子を駆動しているので、圧電振動子から得
られる検出電圧は常時一定に保たれる。
As described above, in this drive detection circuit, even if the detected voltage of the piezoelectric vibrator changes with temperature, the piezoelectric vibrator is driven by the temperature-compensated drive voltage generated by temperature-compensating the variable component of the output. Therefore, the detection voltage obtained from the piezoelectric vibrator is always kept constant.

【0026】[0026]

【発明の効果】以上に述べた通り、本発明の圧電振動ジ
ャイロ用駆動検出回路によれば、温度補償回路を設けて
圧電振動子の検出電圧が温度によって変化する場合で
も、その出力の可変分を温度補償した温度補償駆動電圧
を圧電振動子に印加しているので、圧電振動子から得ら
れる検出電圧は常時一定に保たれるようになる。この結
果、圧電振動ジャイロにおいては、温度変化による影響
を受けずに安定した検出感度が得られるようになる。
As described above, according to the drive detection circuit for a piezoelectric vibration gyroscope of the present invention, even if the detection voltage of the piezoelectric vibrator is changed by providing the temperature compensation circuit, the variable component of the output can be changed. Since the temperature-compensated drive voltage that is temperature-compensated is applied to the piezoelectric vibrator, the detection voltage obtained from the piezoelectric vibrator is always kept constant. As a result, in the piezoelectric vibration gyro, stable detection sensitivity can be obtained without being affected by the temperature change.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例に係る圧電振動ジャイロ用駆
動検出回路の基本構成を示したブロック図である。駆動
回路を構成する温度補償回路の実施例の回路図である。
FIG. 1 is a block diagram showing a basic configuration of a piezoelectric vibration gyro drive detection circuit according to an embodiment of the present invention. It is a circuit diagram of an example of a temperature compensation circuit which constitutes a drive circuit.

【図2】図1に示す圧電振動ジャイロ用駆動検出回路の
要部である温度補償回路の回路構成を示したものであ
る。
2 shows a circuit configuration of a temperature compensation circuit which is a main part of the drive detection circuit for a piezoelectric vibration gyro shown in FIG.

【図3】従来の圧電振動ジャイロに用いられる圧電振動
子の概略構造を示したもので、(a)はその斜視図、
(b)はその中央部における断面図である。
FIG. 3 shows a schematic structure of a piezoelectric vibrator used in a conventional piezoelectric vibrating gyroscope, in which (a) is a perspective view thereof,
(B) is a cross-sectional view of the central portion thereof.

【図4】図3で説明した圧電振動ジャイロに用いられる
駆動検出回路の基本構成を示したブロック図である。
FIG. 4 is a block diagram showing a basic configuration of a drive detection circuit used in the piezoelectric vibration gyro described in FIG.

【符号の説明】[Explanation of symbols]

1 円柱状圧電セラミックス 2,4,6 アース用帯状電極 5 駆動用帯状電極 3,7 検出用帯状電極 8a,8b アース用接続電極 9,19 差動増幅回路 10,20 同期検波回路 11,21 加算演算回路 12,22 移相回路 13 サーミスタ 14,15 抵抗 18 温度補償回路 1 Cylindrical piezoelectric ceramics 2,4,6 Earth band electrode 5 Drive band electrode 3,7 Detection band electrode 8a, 8b Ground connection electrode 9,19 Differential amplifier circuit 10,20 Synchronous detection circuit 11,21 Addition Arithmetic circuit 12,22 Phase shift circuit 13 Thermistor 14,15 Resistance 18 Temperature compensation circuit

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 圧電振動子から得られる検出電圧を合成
して加算電圧として出力する加算増幅回路と、前記加算
電圧を入力して前記圧電振動子の共振周波数に等しい周
波数の駆動電圧を出力する移相回路とを含む圧電振動ジ
ャイロ用駆動検出回路において、前記駆動電圧を温度補
償して温度補償駆動電圧を生成すると共に、該温度補償
駆動電圧を前記圧電振動子に印加する温度補償回路が設
けられたことを特徴とする圧電振動ジャイロ用駆動検出
回路。
1. A summing amplifier circuit for synthesizing detection voltages obtained from a piezoelectric vibrator and outputting the summed voltage, and a driving voltage having a frequency equal to the resonance frequency of the piezoelectric vibrator, to which the summed voltage is input. A piezoelectric vibration gyro drive detection circuit including a phase shift circuit is provided with a temperature compensation circuit that temperature-compensates the drive voltage to generate a temperature-compensated drive voltage and applies the temperature-compensated drive voltage to the piezoelectric vibrator. A drive detection circuit for a piezoelectric vibrating gyro, which is characterized in that
【請求項2】 請求項1記載の圧電振動ジャイロ用駆動
検出回路において、前記温度補償回路は、前記検出電圧
の温度変化に伴う可変分に応じて前記駆動電圧を温度補
償することで前記温度補償駆動電圧を得ることを特徴と
する圧電振動ジャイロ用駆動検出回路。
2. The piezoelectric vibration gyro drive detection circuit according to claim 1, wherein the temperature compensation circuit temperature-compensates the drive voltage in accordance with a variable amount of the detected voltage according to a temperature change. A drive detection circuit for a piezoelectric vibration gyro, which is characterized by obtaining a drive voltage.
JP5322088A 1993-12-21 1993-12-21 Driving detection circuit for piezoelectric vibrating gyro Pending JPH07174568A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5322088A JPH07174568A (en) 1993-12-21 1993-12-21 Driving detection circuit for piezoelectric vibrating gyro

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5322088A JPH07174568A (en) 1993-12-21 1993-12-21 Driving detection circuit for piezoelectric vibrating gyro

Publications (1)

Publication Number Publication Date
JPH07174568A true JPH07174568A (en) 1995-07-14

Family

ID=18139786

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5322088A Pending JPH07174568A (en) 1993-12-21 1993-12-21 Driving detection circuit for piezoelectric vibrating gyro

Country Status (1)

Country Link
JP (1) JPH07174568A (en)

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