JPH06229765A - Angular speed sensor - Google Patents

Abstract

PURPOSE:To eliminate fluctuation in the soldered area and the quantity of solder by adding a component for accelerating soldering to the wiring parts of driving and detecting electrodes thereby facilitating the soldering work. CONSTITUTION:When a component, e.g. zinc, tin or nickel, is added to the wiring parts 11a, 12a of driving and detecting electrodes 11, 12, soldering work is facilitated and the strength of solder is enhanced. Furthermore, the solder is constricted within the wiring parts 11a, 12a by the surface tension thereof and the soldering range is specified thus suppressing fluctuation in the quantity of solder. Furthermore, the solder is not fed to unrequired part and thereby has no adverse effect on the oscillation of an oscillator 10 thus preventing the accuracy of sensor from lowering.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an angular velocity sensor.

[0002]

2. Description of the Related Art Conventionally, in this type of angular velocity sensor,
The drive and detection electrodes are attached by printing a paste containing metal powder on the outer periphery of the vibrating body. At this time, the adhesion between the vibrating body and the paste is improved by adding a frit component to the paste by a known technique. Then, as disclosed in GB2154739B, the lead wire is directly soldered to the electrode for connection.

[0003]

However, in the above-mentioned conventional technique, the electrode containing the frit component is directly soldered for connection, but since the electrode containing the frit component is less likely to be soldered, the connection work is difficult. There is a problem that it is difficult and the solder strength is low. Furthermore, the surface of the electrode is a uniform flat surface, and the variation in the amount of solder after soldering is large, resulting in a large variation in impedance, which adversely affects the output of the sensor and leads to a decrease in sensor accuracy.
Further, if the surface of the electrode is a flat surface, if the solder adheres more than necessary and affects the vibration of the vibrating body, the vibration of the vibrating body is affected.
This conventional angular velocity sensor detects the angular velocity of the rotation of the sensing object by the change in the output voltage from the detection electrode due to the change in the vibration of the vibrating part. Also affects the accuracy of the sensor.

It is a technical object of the present invention to make it easy to attach solder, to make the amount of solder after soldering substantially constant, and to perform soldering within a predetermined range.

[0005]

The technical means taken in the present invention for solving the above-mentioned technical problems are a vibrating body having a cylindrical shape and made of a piezoelectric material, and attached to a main surface of the vibrating body, respectively. Driving and detecting electrodes, a power supply that applies a voltage to the driving electrodes, an arithmetic unit that calculates the angular velocity from the output voltage from the detecting electrodes, and a driving electrode that is joined to the driving and detecting electrodes by soldering. In an angular velocity sensor having a power source, a detection electrode, and a lead wire that electrically connects the arithmetic device to each other, in the angular velocity sensor, the lead wire is soldered with a component that is provided on the driving and detection electrodes and that easily attaches solder. Is to have a section.

[0006]

The function of the present invention will be described. Since the connection portion contains a component to which solder easily attaches, it is easy to attach solder and the soldering work is easy. Further, since the solder has a surface tension and has a connecting portion on the electrode,
The solder is less likely to stick out from the connection portion, and the solder area after the soldering is reduced by specifying the soldering range, and at the same time, the variation in the solder amount is reduced. Further, since the solder does not reach the place that affects the vibration of the vibrating portion, the sensor accuracy is prevented from being degraded.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described with reference to the drawings.

FIG. 1 is a half sectional view of the angular velocity sensor of this embodiment. In the figure, reference numeral 10 is a cylindrical vibrating body made of a piezoelectric material, and eight driving electrodes 11 and detection electrodes 12 are alternately printed on the outer periphery of the vibrating body 10, and An upper peripheral electrode 13 for performing a polarization process is printed on the upper side in the drawing, and the vibrating body 10 is also provided.
The ground electrode 15 is printed on the entire inner surface of the. Driving and detecting electrodes 11 and 12, upper peripheral electrode 1
3 and the ground electrode 15 each contain a frit component, and have high adhesion to the vibrating body 10. The lower end of the vibrating body 10 is fixed to a metal fixed body 14, and the vibration increases as it goes upward. The fixed body 14 is fixed to a detection object (not shown) at the cylindrical support portion 14a,
The rotational angular velocity of the detection object is measured by the output voltage from the detection electrode 12 due to the change in the vibration of the vibrating body 10. A connection portion 1 containing, for example, zinc, tin, nickel, or the like, is provided on each of the driving and detection electrodes 11 and 12.
1a and 12a are printed.

The connection portion 11a on the driving electrode 11 can be electrically connected to a power source (not shown) via a lead wire (not shown). In addition, the connection portion 12a on the detection electrode 12
Can be electrically connected to an arithmetic unit (not shown) via a lead wire.

Next, the operation of the present invention will be described.

Since the connecting portions 11a and 12a of the driving and detecting electrodes 11 and 12 respectively contain components such as zinc, tin and nickel, the connecting portions 11a and 12a.
Solder is easy to attach, soldering work is easy, and solder strength is high. Further, the solder is less likely to protrude from the wire connection portions 11a and 12a due to the surface tension, and the range of soldering is specified, so that the variation in the amount of solder after soldering is small.

Further, since the solder is not attached to unnecessary portions, it is not attached to a portion that affects the vibration of the vibrating portion 10, so that the vibration of the vibrating body 10 is not adversely affected and the sensor accuracy is reduced. Is prevented.

[0013]

The effects of the present invention will be described. A vibrating body that has a cylindrical shape and is made of a piezoelectric material, drive and detection electrodes that are attached to the main surfaces of the vibrating body, a power supply that applies a voltage to the drive electrode, and an angular velocity based on the output voltage from the detection electrode. In an angular velocity sensor having an arithmetic unit for calculating the following, and a drive electrode and a power source that are joined to the driving and detecting electrodes by soldering and a lead wire that electrically connects the detecting electrode and the arithmetic unit, In the angular velocity sensor, which is provided on the electrode for use and has a connecting portion to which the lead wire is soldered, which includes a component to which solder easily attaches, in the angular velocity sensor, the width of the connecting portion is arbitrarily narrowed in a portion not to be soldered. The angular velocity sensor is characterized in that the wiring part contains a component that easily attaches solder, so soldering is easy and soldering work is easy. That. In addition, since the solder has surface tension and the wire connection part is provided on the electrode, it is difficult for the solder to protrude from the wire connection part, and the soldering area after the soldering is specified by specifying the soldering range. Of the solder amount is reduced, and at the same time, the amount of solder is also reduced. Further, since the solder does not reach the place that affects the vibration of the vibrating portion, the sensor accuracy is prevented from being degraded.

[Brief description of drawings]

FIG. 1 is a half sectional view of an angular velocity sensor of this embodiment.

[Explanation of symbols]

 10 ... Vibrating body 11 ... Driving electrode 11a ... Connection part 12 ... Detection electrode 12a ... Connection part 13 ... Upper peripheral electrode 14 ... Fixed body 15 ... Ground electrode

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Masayuki Sato 2-1-1 Asahi-cho, Kariya City, Aichi Aisin Seiki Co., Ltd. (72) Inventor Hiroshi Kajino 2-chome, Asahi-cho, Kariya City, Aichi Prefecture Address: Aisin Seiki Co., Ltd. (72) Inventor, Hideya Kurachi, 2-1-1 Asahi-cho, Kariya City, Aichi Aisin Seiki Co., Ltd.

Claims (1)

[Claims] 1. A vibrating body having a cylindrical shape and made of a piezoelectric material, driving and detecting electrodes attached to respective main surfaces of the vibrating body, a power source for applying a voltage to the driving electrode, and the detecting means. An arithmetic unit for calculating the angular velocity from the output voltage from the working electrode, and electrically connected between the driving electrode and the power source and the detecting electrode and the arithmetic unit by being soldered to the driving and detecting electrodes. An angular velocity sensor having a lead wire, the angular velocity sensor comprising a connecting portion which is provided on the driving and detecting electrodes and to which the lead wire is soldered, including a component that easily attaches solder.