JP5330620B1 - Servo type acceleration sensor - Google Patents

Servo type acceleration sensor Download PDF

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JP5330620B1
JP5330620B1 JP2013086444A JP2013086444A JP5330620B1 JP 5330620 B1 JP5330620 B1 JP 5330620B1 JP 2013086444 A JP2013086444 A JP 2013086444A JP 2013086444 A JP2013086444 A JP 2013086444A JP 5330620 B1 JP5330620 B1 JP 5330620B1
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pendulum
frame
servo
acceleration sensor
plate member
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JP2014211316A (en
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淳 関
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Rion Co Ltd
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Rion Co Ltd
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Abstract

【課題】 安価な部品で構成でき、且つ組立・調整が容易なサーボ式加速度センサを提供する。
【解決手段】 加速度に応じて変位する振子部6と、この振子部6を支持する枠部7と、振子部6の変位を静電容量の変化で検知する変位検出部16a,16bと、この変位検出部16a,16bが検知した静電容量の変化量に基づき、振子部6に設けたコイル13aに振子部6の変位を制御する電流を供給するサーボ回路部3を備え、このサーボ回路部3が供給する電流を加速度として出力するサーボ式加速度センサ1であって、変位検出部16a,16bの電極配線部11e,11fとコイル13aの配線部を兼ねる可撓部11c,11dを形成する金属薄板部材11が、一対の振子部用プリント基板12a,12bと一対の枠部用プリント基板17a,17bにより挟持され、振子部6の表面と枠部7の表面が同一平面に形成される。
【選択図】 図2
PROBLEM TO BE SOLVED: To provide a servo type acceleration sensor which can be constituted by inexpensive parts and can be easily assembled and adjusted.
A pendulum unit 6 that is displaced according to acceleration, a frame unit 7 that supports the pendulum unit 6, displacement detection units 16a and 16b that detect displacement of the pendulum unit 6 by a change in capacitance, and A servo circuit unit 3 is provided for supplying a current for controlling the displacement of the pendulum unit 6 to the coil 13a provided on the pendulum unit 6 based on the amount of change in capacitance detected by the displacement detection units 16a and 16b. 3 is a servo type acceleration sensor 1 that outputs the current supplied by 3 as acceleration, and is a metal that forms flexible portions 11c and 11d that also serve as electrode wiring portions 11e and 11f of the displacement detection portions 16a and 16b and wiring portions of the coil 13a. The thin plate member 11 is sandwiched between a pair of pendulum printed boards 12a and 12b and a pair of frame printed boards 17a and 17b, and the surface of the pendulum 6 and the surface of the frame 7 are formed in the same plane.
[Selection] Figure 2

Description

本発明は、地震計などに用いられるサーボ式加速度センサに関する。   The present invention relates to a servo-type acceleration sensor used for a seismometer or the like.

静電容量型のサーボ式加速度センサは、加速度が加わると、枠部に対して振子部が変位しようとするが、その変位を静電容量の変化で検知し、振子部に備わるコイルに静電容量の変化に応じた電流を流して電磁力を発生させ、振子部が見掛け上では静止状態となるようにしている。この電流は加速度に比例するので、電流を測定すれば、加速度を知ることができる。   In the capacitance type servo acceleration sensor, when acceleration is applied, the pendulum part tends to displace with respect to the frame part. However, the displacement is detected by a change in the electrostatic capacity, and the coil provided in the pendulum part is electrostatically detected. An electromagnetic force is generated by flowing a current according to the change in the capacity so that the pendulum portion is apparently stationary. Since this current is proportional to the acceleration, the acceleration can be known by measuring the current.

特許文献1には、コイルパターンが形成された複数の基板で振動子(振子部)を構成し、この振動子(振子部)の支持体として、振動子(振子部)の一端側に可撓性のばねを設け、このばねをコイルパターンの配線材としても機能させるサーボ形振動センサが記載されている。   In Patent Document 1, a vibrator (pendulum part) is constituted by a plurality of substrates on which a coil pattern is formed, and a flexible body is provided on one end side of the vibrator (pendulum part) as a support for the vibrator (pendulum part). A servo-type vibration sensor is described in which a spring is provided and this spring also functions as a wiring material for a coil pattern.

また、特許文献2には、可動板(振子部)とヒンジを別体とし、可動板(振子部)を支持するヒンジを可撓板(金属のバネ材)で形成し、この可撓板をコ字状のクリップ部材により可動板(振子部)と固定板(枠部)に固定する構成の傾斜計が記載されている。   In Patent Document 2, a movable plate (pendulum part) and a hinge are separated, and a hinge for supporting the movable plate (pendulum part) is formed of a flexible plate (metal spring material). An inclinometer is described which is fixed to a movable plate (pendulum portion) and a fixed plate (frame portion) by a U-shaped clip member.

特許第2861694号公報Japanese Patent No. 2861694 特許第2913525号公報Japanese Patent No. 2913525

特許文献1に記載の技術においては、振動子(振子部)を磁気的な力で制御駆動することになるが、その駆動力はコイルの巻数・ギャップ磁場・コイルを流れる電流に比例する。このような部品構成では、ギャップ磁場(例えば5000ガウス)を確保すること、コイルパターンでの巻数(例えば600ターン)を確保することが難しく、かなりの電流を流すことになるので、実用化が難しい。   In the technique described in Patent Document 1, the vibrator (pendulum unit) is controlled and driven by a magnetic force, and the driving force is proportional to the number of turns of the coil, the gap magnetic field, and the current flowing through the coil. In such a component configuration, it is difficult to secure a gap magnetic field (for example, 5000 gauss), to secure the number of turns in the coil pattern (for example, 600 turns), and to pass a considerable current, so it is difficult to put it to practical use. .

また、特許文献2に記載の技術においては、固定板と可動板にコ字状のクリップ部材で可撓板をそれぞれ固定する構成なので、部品点数が増え、組立作業も容易でなく、小型化には不向きであり、組立工数も増える。   In the technique described in Patent Document 2, the flexible plate is fixed to the fixed plate and the movable plate with a U-shaped clip member, so that the number of parts increases, the assembly work is not easy, and the size is reduced. Is unsuitable and increases the number of assembly steps.

本発明は、従来の技術が有するこのような問題点に鑑みてなされたものであり、その目的とするところは、安価な部品で構成でき、且つ組立・調整が容易なサーボ式加速度センサを提供しようとするものである。   The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide a servo-type acceleration sensor that can be configured with inexpensive parts and can be easily assembled and adjusted. It is something to try.

上記課題を解決すべく請求項1に係る発明は、加速度に応じて変位する振子部と、この振子部を支持する枠部と、振子部の変位を静電容量の変化で検知する変位検出部と、この変位検出部が検知した静電容量の変化量に基づき、前記振子部に設けたコイルに前記振子部の変位を制御する電流を供給するサーボ回路部を備え、このサーボ回路部が供給する電流を加速度として出力するサーボ式加速度センサであって、金属薄板部材を一対の振子部用プリント基板と一対の枠部用プリント基板により挟んで前記振子部と前記枠部を形成すると共に、前記振子部の表面と前記枠部の表面が同一平面になるように構成し、前記振子部は前記金属薄板部材を介して前記枠部に支持され、前記金属薄板部材に前記変位検出部の電極配線部とコイルの配線部を兼ねる可撓部を形成するものである。   In order to solve the above problems, the invention according to claim 1 includes a pendulum part that is displaced according to acceleration, a frame part that supports the pendulum part, and a displacement detection part that detects displacement of the pendulum part by a change in capacitance. And a servo circuit unit for supplying a current for controlling the displacement of the pendulum unit to a coil provided in the pendulum unit based on the amount of change in capacitance detected by the displacement detection unit. A servo-type acceleration sensor that outputs a current to be accelerated as the pendulum part and the frame part are sandwiched between a pair of pendulum part printed boards and a pair of frame part printed boards. The surface of the pendulum part and the surface of the frame part are configured to be in the same plane, the pendulum part is supported by the frame part via the metal thin plate member, and the electrode wiring of the displacement detection unit is connected to the metal thin plate member And coil wiring And it forms a flexible portion which also serves.

前記変位検出部は、前記一対の振子部用プリント基板に夫々形成された電極と、これらの電極に対向する各ハウジングにより構成され、前記各ハウジングの少なくとも一方は磁気回路を構成し、前記枠部と前記各ハウジングの間に挟装される各スペーサの厚みにより、前記変位検出部の電極間ギャップを設定することができる。   The displacement detection unit includes electrodes formed on the pair of pendulum printed circuit boards, and housings facing the electrodes. At least one of the housings forms a magnetic circuit, and the frame unit. And the gap between the electrodes of the displacement detector can be set by the thickness of each spacer sandwiched between the housings.

前記振子部の先端側に凸部を形成すると共に、この凸部が臨む切り欠き部を前記枠部に形成し、前記凸部及び前記切り欠き部を構成する前記金属薄板部材は夫々前記振子部用プリント基板及び前記枠部用プリント基板より突出させることができる。   A convex part is formed on the tip end side of the pendulum part, a notch part facing the convex part is formed in the frame part, and the metal thin plate members constituting the convex part and the notch part are respectively the pendulum part. It can project from the printed circuit board for a frame and the printed circuit board for a frame part.

前記電極配線部の少なくとも一部を曲げて形成することができる。   It can be formed by bending at least a part of the electrode wiring part.

また、前記金属薄板部材の前記振子部用プリント基板と前記枠部用プリント基板に挟まれる面に、複数の微小孔を形成することができる。   A plurality of minute holes can be formed on a surface of the metal thin plate member sandwiched between the pendulum printed board and the frame printed board.

本発明によれば、金属薄板部材を一対の振子部用プリント基板と一対の枠部用プリント基板で挟持することにより振子部と枠部を構成するので、振子部と枠部の組立作業が容易になると共に、安価な部品で構成することができる。   According to the present invention, the pendulum part and the frame part are configured by sandwiching the metal thin plate member between the pair of pendulum part printed circuit boards and the pair of frame part printed circuit boards, so that the assembly operation of the pendulum part and the frame part is easy. At the same time, it can be configured with inexpensive parts.

また、変位検出部の電極間ギャップをスペーサの厚みにより設定すれば、電極間のギャップ調整が容易になる。   Further, if the gap between the electrodes of the displacement detection unit is set by the thickness of the spacer, the gap adjustment between the electrodes becomes easy.

振子部の先端側に凸部を形成すると共に、この凸部が臨む切り欠き部を枠部に形成すれば、枠部に対する振子部の位置ズレを容易に確認することができる。   If a convex part is formed on the tip side of the pendulum part and a notch part where the convex part faces is formed in the frame part, the positional deviation of the pendulum part with respect to the frame part can be easily confirmed.

電極配線部の少なくとも一部を曲げて形成すれば、組立時や引張りなどによるストレスを逃すことで、振子部の偏りを防ぐことができる。   If at least a part of the electrode wiring part is bent, the pendulum part can be prevented from being biased by releasing stress due to assembly or pulling.

また、金属薄板部材の振子部用プリント基板と枠部用プリント基板に挟まれる面に、複数の微小孔を形成すれば、接着剤を塗布して一対の振子部用プリント基板と一対の枠部用プリント基板を貼り合わせ密着させた時に、接着剤が微小孔に入り込み、そのまま硬化するので十分な接着力を得ることができる(アンカー効果)。   Also, if a plurality of minute holes are formed on the surface of the metal thin plate member sandwiched between the pendulum printed board and the frame printed board, an adhesive is applied to form a pair of pendulum printed boards and a pair of frame parts. When the printed circuit board is bonded and brought into close contact, the adhesive enters the micropore and cures as it is, so that a sufficient adhesive force can be obtained (anchor effect).

本発明に係るサーボ式加速度センサの概略断面図Schematic sectional view of a servo acceleration sensor according to the present invention センサ部の概略断面図Schematic cross section of sensor 金属薄板部材の平面図Plan view of sheet metal member 振子部用プリント基板の平面図Plan view of printed circuit board for pendulum 枠部用プリント基板の平面図Plan view of printed circuit board for frame 接着剤を塗布した振子部用プリント基板と枠部用プリント基板の平面図Plan view of printed circuit board for pendulum and frame printed with adhesive 第1組立治具の説明図で、(a)は第1組立治具の平面図、(b)は第1組立治 具の側面図、(c)は第1組立治具に振子部用プリント基板と枠部用プリント基板を載置 した状態の平面図It is explanatory drawing of a 1st assembly jig, (a) is a top view of a 1st assembly jig, (b) is a side view of a 1st assembly jig, (c) is a print for pendulum parts on a 1st assembly jig Plan view of the board and frame printed circuit board placed 振子部用プリント基板と枠部用プリント基板に金属薄板部材を載置した状態の平面図Plan view of a state in which a thin metal plate member is placed on the pendulum printed board and the frame printed board 金属薄板部材に振子部用プリント基板と枠部用プリント基板を載置した状態の平 面図Plan view with the pendulum printed circuit board and the frame printed circuit board placed on a thin metal plate 第2組立治具の説明図で、(a)は第2組立治具の平面図、(b)は第2組立 治具の側面図、(c)は第2組立治具を第1組立治具にセットした状態の平面図、(d) は第2組立治具を第1組立治具にセットした状態の側面図It is explanatory drawing of a 2nd assembly jig, (a) is a top view of a 2nd assembly jig, (b) is a side view of a 2nd assembly jig, (c) is a 1st assembly jig of a 2nd assembly jig. The top view of the state set to the implement, (d) is the side view of the state which set the 2nd assembly jig to the 1st assembly jig 振子部と枠部の平面図Top view of pendulum and frame 振子部の先端凸部と枠部の切り欠き部の拡大図Enlarged view of the tip convex part of the pendulum part and the cutout part of the frame part コイルを取り付けた振子部の断面図Cross-sectional view of the pendulum with the coil attached 第1ハウジングの説明図で、(a)は平面図、(b)は断面図It is explanatory drawing of a 1st housing, (a) is a top view, (b) is sectional drawing. 第2ハウジングの説明図で、(a)は平面図、(b)は断面図It is explanatory drawing of a 2nd housing, (a) is a top view, (b) is sectional drawing. スペーサの平面図Top view of spacer ベース部材の説明図で、(a)は平面図、(b)は断面図It is explanatory drawing of a base member, (a) is a top view, (b) is sectional drawing.

以下に本発明の実施の形態を添付図面に基づいて説明する。本発明に係るサーボ式加速度センサ1は、図1に示すように、センサ部2、サーボ回路部3、ケース4、ベース部材5からなる。センサ部2はベース部材5に取り付けられ、サーボ回路部3はセンサ部2に取り付けられている。   Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, the servo acceleration sensor 1 according to the present invention includes a sensor unit 2, a servo circuit unit 3, a case 4, and a base member 5. The sensor unit 2 is attached to the base member 5, and the servo circuit unit 3 is attached to the sensor unit 2.

センサ部2は、図2に示すように、振子部6、枠部7、第1ハウジング8、第2ハウジング9、2つのスペーサ10a,10bなどからなる。センサ部2の形状は略円筒形をなし、高さは約15mmであり外径は約23mmである。   As shown in FIG. 2, the sensor unit 2 includes a pendulum unit 6, a frame unit 7, a first housing 8, a second housing 9, two spacers 10a and 10b, and the like. The sensor portion 2 has a substantially cylindrical shape, a height of about 15 mm, and an outer diameter of about 23 mm.

振子部6及び枠部7は、金属薄板部材11を一対の振子部用プリント基板12a,12b及び枠部用プリント基板17a,17bでそれぞれ挟んで接着してなり、振子部6の両面となる振子部用プリント基板12a,12bにはコイル13a,13bが取り付けられている。   The pendulum part 6 and the frame part 7 are formed by sandwiching and bonding the metal thin plate member 11 between the pair of pendulum part printed boards 12a and 12b and the frame part printed boards 17a and 17b. Coils 13a and 13b are attached to the printed circuit boards 12a and 12b.

振子部用プリント基板12a,12bに設けた電極14a,14bは、振子部6の金属薄板部材11を介して枠部7に支持される側の反対側の端部付近の両面に配置され、これら電極14a,14bに対向する第1ハウジング8の表面15a及び第2ハウジング9の表面15bにより静電容量を検出する変位検出部16a,16bが形成される。   The electrodes 14a, 14b provided on the printed circuit boards 12a, 12b for the pendulum part are arranged on both sides in the vicinity of the end part opposite to the side supported by the frame part 7 through the metal thin plate member 11 of the pendulum part 6, Displacement detectors 16a and 16b for detecting capacitance are formed by the surface 15a of the first housing 8 and the surface 15b of the second housing 9 facing the electrodes 14a and 14b.

また、枠部7は、スペーサ10a,10bを介して第1ハウジング8と第2ハウジング9により挟装されている。   Further, the frame portion 7 is sandwiched between the first housing 8 and the second housing 9 via the spacers 10a and 10b.

金属薄板部材11は、図3に示すように、振子部6となる振子側部位11aと枠部7となる枠部側部位11bが形成されると共に、コイル13a,13bの配線を兼ねる2箇所の可撓部11c,11dと、変位検出部16a,16bの電極14a,14bの配線となる電極配線部11e,11fを形成している。   As shown in FIG. 3, the metal thin plate member 11 is formed with a pendulum side portion 11a to be the pendulum portion 6 and a frame portion side portion 11b to be the frame portion 7 and also serves as wiring of the coils 13a and 13b. Electrode wiring portions 11e and 11f that form wirings of the flexible portions 11c and 11d and the electrodes 14a and 14b of the displacement detection portions 16a and 16b are formed.

配線を兼ねる可撓部11c,11dと電極配線部11e,11fがサーボ回路部3と配線される。金属薄板部材11には、振子部側部位11aと枠部側部位11bの夫々に2つ(合計4つ)のガイド孔11gが形成されている。なお、図3のような形状の場合では、組立作業において金属薄板部材11の不要な部分11h及び11iを切断する。   The flexible portions 11c and 11d also serving as wiring and the electrode wiring portions 11e and 11f are wired to the servo circuit portion 3. The metal thin plate member 11 is formed with two (four in total) guide holes 11g in each of the pendulum part side part 11a and the frame part side part 11b. In the case of the shape as shown in FIG. 3, unnecessary portions 11h and 11i of the thin metal plate member 11 are cut in the assembling work.

可撓部11c,11dの可撓性の調整は、金属薄板部材11の板厚及び可撓部11c,11dの幅を調整することにより、容易となり、品質のバラツキが少なくなる。また、変位検出部16a,16bの電極14a,14bの電極配線部11e,11fは、例えば略コの字形状に屈曲した形状にすることにより、組立時に加わるストレスを逃すので、振子部6の捻じれなどを防ぐことができる。   The flexibility of the flexible portions 11c and 11d can be easily adjusted by adjusting the plate thickness of the thin metal plate member 11 and the width of the flexible portions 11c and 11d, and the variation in quality is reduced. In addition, the electrode wiring portions 11e and 11f of the electrodes 14a and 14b of the displacement detectors 16a and 16b are bent into, for example, a substantially U-shape so that stress applied during assembly is released. This can be prevented.

振子部用プリント基板12a,12bには、図4に示すように、2つのガイド孔12cと貫通孔12dが形成されている。また、振子部用プリント基板12a,12bには、弓形状の電極14a,14b及び3つのコイル位置決め用銅箔パターン14cが形成されている。なお、振子部用プリント基板12a,12bの金属薄板部材11の振子側部位11aとの接着面(裏面)には電極14a,14bや銅箔パターン14cがない。   As shown in FIG. 4, two guide holes 12c and through holes 12d are formed in the pendulum printed circuit boards 12a and 12b. The pendulum printed boards 12a and 12b are provided with bow-shaped electrodes 14a and 14b and three coil positioning copper foil patterns 14c. Note that the electrodes 14a and 14b and the copper foil pattern 14c are not present on the adhesion surface (back surface) of the pendulum printed circuit boards 12a and 12b to the pendulum side portion 11a of the metal thin plate member 11.

枠部用プリント基板17a,17bには、図5に示すように、2つのガイド孔17cが形成されている。また、スペーサ10a,10bと接する枠部用プリント基板17a,17bの面(表面)には、振子部用プリント基板12a,12bの電極14a,14bと同じ厚みで、ほぼ全面を覆うように銅箔パターン17dが形成されている。なお、枠部用プリント基板17a,17bの金属薄板部材11の枠部側部位11bとの接着面(裏面)には銅箔パターン17dがない。   As shown in FIG. 5, two guide holes 17c are formed in the frame printed boards 17a and 17b. Further, the surface (front surface) of the frame printed circuit boards 17a and 17b in contact with the spacers 10a and 10b is the same thickness as the electrodes 14a and 14b of the pendulum printed circuit boards 12a and 12b, and is covered with copper foil. A pattern 17d is formed. In addition, the copper foil pattern 17d does not exist in the adhesive surface (back surface) with the frame part side site | part 11b of the metal thin plate member 11 of the printed circuit boards 17a and 17b for frames.

次に、本発明に係るサーボ式加速度センサ1の組立作業手順について説明する。先ず、センサ部2を構成する振子部6と枠部7を組み立てるには、図6に示すように、振子部用プリント基板12a,12bの裏面の所定の箇所に接着剤18を塗布する。同様に、枠部用プリント基板17a,17bの裏面の所定の箇所に接着剤18を塗布する。接着剤18としては、加熱硬化タイプのエポキシ系接着剤が適している。   Next, the assembly work procedure of the servo acceleration sensor 1 according to the present invention will be described. First, in order to assemble the pendulum part 6 and the frame part 7 constituting the sensor part 2, as shown in FIG. 6, an adhesive 18 is applied to a predetermined portion on the back surface of the pendulum part printed boards 12a and 12b. Similarly, the adhesive 18 is applied to a predetermined portion on the back surface of the frame portion printed boards 17a and 17b. As the adhesive 18, a heat curing type epoxy adhesive is suitable.

次いで、図7(a),(b)に示すように、ネジ穴20aと4本のガイドピン20bを設けた第1組立治具20を用意する。そして、図7(c)に示すように、第1組立治具20の上に、接着剤18を塗布した面(裏面)を上にして、振子部用プリント基板12aのガイド孔12cと枠部用プリント基板17aのガイド孔17cをガイドピン20bに夫々挿通させて、一方の振子部用プリント基板12aと一方の枠部用プリント基板17aを載置する。   Next, as shown in FIGS. 7A and 7B, a first assembly jig 20 provided with a screw hole 20a and four guide pins 20b is prepared. Then, as shown in FIG. 7C, the guide hole 12c and the frame portion of the pendulum printed board 12a are placed on the first assembly jig 20 with the surface (back surface) coated with the adhesive 18 facing upward. The guide holes 17c of the printed circuit board 17a are respectively inserted into the guide pins 20b, and the one printed circuit board 12a for the pendulum part and the printed circuit board 17a for the frame part are placed.

次いで、図8に示すように、第1組立治具20に接着剤塗布面を上にして載置された振子部用プリント基板12aと枠部用プリント基板17aの上に、金属薄板部材11の11iをカットし、夫々2つのガイド孔11gを第1組立治具20のガイドピン20bに挿通させて金属薄板部材11を載置する。なお、図8に示す金属薄板部材11は不要な部分11hをカットする前の状態である。   Next, as shown in FIG. 8, the metal thin plate member 11 is placed on the pendulum printed board 12 a and the frame printed board 17 a placed on the first assembly jig 20 with the adhesive application surface facing upward. 11i is cut, and the thin metal plate member 11 is placed by inserting two guide holes 11g into the guide pins 20b of the first assembly jig 20 respectively. In addition, the metal thin plate member 11 shown in FIG. 8 is in a state before cutting the unnecessary portion 11h.

次いで、図9に示すように、他方の振子部用プリント基板12bと他方の枠部用プリント基板17bの接着剤塗布面(裏面)を下にして、夫々のプリント基板12b,17bのガイド孔12c,17cを第1組立治具20のガイドピン20bに挿通させて金属薄板部材11の上に載置する。   Next, as shown in FIG. 9, the guide hole 12c of each printed circuit board 12b, 17b with the adhesive-coated surface (back surface) of the other printed circuit board 12b for pendulum and the printed circuit board 17b for the other frame section facing down. , 17 c are inserted into the guide pins 20 b of the first assembly jig 20 and placed on the thin metal plate member 11.

次いで、図10(a),(b)に示すように、貫通孔21aと4つの遊嵌穴21bを設けた第2組立治具21と、締付ボルト22を用意する。なお、遊嵌穴21bは第2組立治具21を載置した際に第1組立治具20のガイドピン20bに第2組立治具21が当たらないようにするためである。そして、第2組立治具21を振子部用プリント基板12bと枠部用プリント基板17bの上に、第1組立治具20のネジ穴20aと貫通孔21a及びガイドピン20bと遊嵌穴21bの位置を合わせて載置する。   Next, as shown in FIGS. 10A and 10B, a second assembly jig 21 provided with a through hole 21a and four loose fitting holes 21b, and a fastening bolt 22 are prepared. The loose fitting holes 21b are for preventing the second assembly jig 21 from hitting the guide pins 20b of the first assembly jig 20 when the second assembly jig 21 is placed. Then, the second assembly jig 21 is placed on the pendulum printed circuit board 12b and the frame printed circuit board 17b. The screw holes 20a and the through holes 21a, the guide pins 20b, and the loose fitting holes 21b of the first assembly jig 20 are formed. Place it in position.

更に、図10(c),(d)に示すように、締付ボルト22を、第2組立治具21の貫通孔21a、振子部用プリント基板12bの貫通孔12d、金属薄板部材11の中央部、振子部用プリント基板12aの貫通孔12dに挿通させ、第1組立治具20のネジ穴20aに螺合させて所定のトルクで締付ける。ここでは、締付ボルト22を用いたが、締付ボルト22で締付けるのではなく、第2組立治具21を錘として一定荷重を加えてもよい。   Further, as shown in FIGS. 10 (c) and 10 (d), the tightening bolt 22 is connected to the through hole 21 a of the second assembly jig 21, the through hole 12 d of the pendulum printed board 12 b, and the center of the thin metal plate member 11. Are inserted into the through holes 12d of the printed circuit board 12a for the pendulum and the pendulum, screwed into the screw holes 20a of the first assembly jig 20, and tightened with a predetermined torque. Here, the tightening bolt 22 is used, but instead of tightening with the tightening bolt 22, a constant load may be applied using the second assembly jig 21 as a weight.

このように、第1組立治具20と第2組立治具21により、金属薄板部材11及び接着剤18を塗布した一対の振子部用プリント基板12a,12bと一対の枠部用プリント基板17a,17bを所定の圧力で挟んだ状態で所定の条件により加熱硬化する。   Thus, the pair of pendulum printed boards 12a and 12b and the pair of frame printed boards 17a coated with the metal thin plate member 11 and the adhesive 18 by the first assembly jig 20 and the second assembly jig 21, respectively. Heat curing is performed under predetermined conditions with 17b sandwiched at a predetermined pressure.

また、金属薄板部材11の接着面の全体に不図示の微小孔(角穴□0.2mm)を複数形成しておけば、接着剤18を塗布した振子部用プリント基板12a,12b及び枠部用プリント基板17a,17bが、第1組立治具20と第2組立治具21と締付ボルト22による締付によって金属薄板部材11に接着した時に、接着剤18が微小孔に入り込みそのまま加熱硬化するので、接着剤18のはみ出しや接着によるそりを防ぎつつ、十分な接着力を得ることができる(アンカー効果)。   Further, if a plurality of unillustrated micro holes (square holes □ 0.2 mm) are formed on the entire bonding surface of the metal thin plate member 11, the pendulum printed circuit boards 12a and 12b and the frame portion coated with the adhesive 18 are used. When the printed circuit boards 17a and 17b are bonded to the metal thin plate member 11 by fastening with the first assembly jig 20, the second assembly jig 21 and the fastening bolts 22, the adhesive 18 enters the microholes and heat cures as it is. Therefore, it is possible to obtain a sufficient adhesive force (anchor effect) while preventing the adhesive 18 from protruding or warping due to adhesion.

また、振子部用プリント基板12a,12bと枠部用プリント基板17a,17bがガラスエポキシ基板であれば、接着剤18を用いることなく、振子部用プリント基板12a,12bと枠部用プリント基板17a,17bを金属薄板部材11に熱融着させてもよい。   If the pendulum printed circuit boards 12a and 12b and the frame printed circuit boards 17a and 17b are glass epoxy substrates, the pendulum printed circuit boards 12a and 12b and the frame printed circuit board 17a are used without using the adhesive 18. 17b may be heat-sealed to the thin metal plate member 11.

上記のように組み立てることで、振子部用プリント基板12a,12b及び枠部用プリント基板17a,17bが多少反っていても硬化時の加熱によって、振子部6と枠部7の平坦性が良くなり、ほとんど同一平面を得ることができる。また、振子部6が金属薄板部材11の可撓部11c,11dを介して枠部7に支持され、金属薄板部材11に対して対称性のよい一体構造となる。   By assembling as described above, even when the pendulum printed boards 12a and 12b and the frame printed boards 17a and 17b are slightly warped, the flatness of the pendulum 6 and the frame 7 is improved by heating during curing. , Almost the same plane can be obtained. Further, the pendulum portion 6 is supported by the frame portion 7 via the flexible portions 11 c and 11 d of the metal thin plate member 11, and has an integrated structure with good symmetry with respect to the metal thin plate member 11.

次いで、図11に示すように、接着剤18の硬化後、組立治具20,21から振子部6と枠部7を外し、金属薄板部材11の不要な部分11hを切り取る。   Next, as shown in FIG. 11, after the adhesive 18 is cured, the pendulum portion 6 and the frame portion 7 are removed from the assembly jigs 20 and 21, and an unnecessary portion 11 h of the metal thin plate member 11 is cut off.

上記手順による組立作業により、振子部6と枠部7は一体構造となる。そして、図12に示すように、振子部6の先端側に凸部6aを形成すると共に、この凸部6aが臨む枠部7に切り欠き部7aを形成し、凸部6a及び切り欠き部7aを構成する金属薄板部材11の振子側部位11a及び枠部側部位11bを夫々振子部用プリント基板12a,12b及び枠部用プリント基板17a,17bから突出させることにより、振子部6と枠部7との変位方向の位置ズレを確認し易くなる。   By the assembling work according to the above procedure, the pendulum part 6 and the frame part 7 have an integral structure. And as shown in FIG. 12, while forming the convex part 6a in the front end side of the pendulum part 6, the notch part 7a is formed in the frame part 7 which this convex part 6a faces, and the convex part 6a and the notch part 7a are formed. The pendulum side part 11a and the frame part side part 11b of the metal thin plate member 11 forming the pendulum part 6 and the frame part 7 are protruded from the pendulum part printed boards 12a and 12b and the frame part printed boards 17a and 17b, respectively. It becomes easy to confirm the positional deviation in the displacement direction.

次いで、図13に示すように、振子部6の両面となる振子部用プリント基板12a,12bのコイル位置決め銅箔パターン14cに合わせてコイル13a,13bを載置し、接着剤で接着する。バランスを保つため、振子部6の両面にコイル13a,13bを取り付ける。そして、片側のコイル13aだけ配線を兼ねる可撓部11c,11dに電気的接続をする。なお、両面のコイル13a,13bを用いる構成とすることもできる。   Next, as shown in FIG. 13, the coils 13a and 13b are placed in accordance with the coil positioning copper foil patterns 14c of the pendulum printed boards 12a and 12b on both sides of the pendulum 6, and are adhered with an adhesive. In order to maintain the balance, the coils 13 a and 13 b are attached to both surfaces of the pendulum unit 6. Then, only the coil 13a on one side is electrically connected to the flexible portions 11c and 11d that also serve as wiring. In addition, it can also be set as the structure which uses the coils 13a and 13b of both surfaces.

位置決め用の銅箔パターン14cを振子部用プリント基板12a,12bに形成することにより、銅箔パターン14cがプリント基板12a,12b面に比べて凸状態(約75μm突出)になるので、コイル13a,13bは容易に位置決めすることができる。   By forming the copper foil pattern 14c for positioning on the printed circuit boards 12a and 12b for the pendulum part, the copper foil pattern 14c becomes a convex state (about 75 μm projecting) as compared with the printed circuit board 12a and 12b surface. 13b can be easily positioned.

次いで、図14に示すように、磁気回路を構成する第1ハウジング8を形成しておく。第1ハウジング8の材料には、飽和磁束密度の高い軟磁性材料(例えば、電磁軟鉄)を使用する。中央部にはマグネット(例えば、希土類マグネット)25を設ける。第1ハウジング8はコイル13aを囲むように設けられ、コイル13aが位置するギャップに所定の磁場を与える。8aは第2ハウジング9との結合用ネジ穴、8bはガイド穴である。   Next, as shown in FIG. 14, the first housing 8 constituting the magnetic circuit is formed. As the material of the first housing 8, a soft magnetic material (for example, electromagnetic soft iron) having a high saturation magnetic flux density is used. A magnet (for example, a rare earth magnet) 25 is provided at the center. The first housing 8 is provided so as to surround the coil 13a, and applies a predetermined magnetic field to the gap where the coil 13a is located. 8a is a screw hole for coupling with the second housing 9, and 8b is a guide hole.

また、図15に示すように、第2ハウジング9を形成しておく。第2ハウジング9は、磁気回路を構成しないが、コイル13bも用いるのであれば第1ハウジング8と同様に構成してもよい。材料は熱的なバランスをとるために、第1ハウジング8と同じ材料を使用する。9aは第1ハウジング8との結合用孔、9bはガイド穴である。   Further, as shown in FIG. 15, the second housing 9 is formed. The second housing 9 does not constitute a magnetic circuit, but may be configured similarly to the first housing 8 if the coil 13b is also used. The same material as that of the first housing 8 is used in order to achieve a thermal balance. 9a is a hole for coupling with the first housing 8, and 9b is a guide hole.

次いで、金属薄板部材11を一対の枠部用プリント基板17a,17bで挟んで接着した枠部7を、ガイドピン(不図示)と結合ボルト(不図示)を用い、2つのスペーサ10a,10bを介して第1ハウジング8と第2ハウジング9により挟装する。スペーサ10a,10bには、薄板で非磁性の金属材を使用する。スペーサ10a,10bは、図16に示すように、枠部用プリント基板17a,17bとほぼ同様の形状であるが、切り欠きのない形状に形成される。10cは結合用孔、10dはガイド孔である。   Next, the frame portion 7 in which the thin metal plate member 11 is sandwiched and bonded by the pair of frame printed boards 17a and 17b is used to guide the two spacers 10a and 10b using guide pins (not shown) and coupling bolts (not shown). The first housing 8 and the second housing 9 are interposed therebetween. The spacers 10a and 10b are made of thin and non-magnetic metal materials. As shown in FIG. 16, the spacers 10a and 10b have substantially the same shape as the frame printed boards 17a and 17b, but are formed without cutouts. 10c is a coupling hole and 10d is a guide hole.

そして、振子部6の一方の面に設けた電極14aと電極14aに対向する第2ハウジング8の表面15aにより構成される変位検出部16aにおいて、所望の静電容量が得られるようスペーサ10aの厚みにより静電容量が調整される。同様に、振子部6の他方の面に設けた電極14bと第2ハウジング9の表面15bにより構成される変位検出部16bにおいて、所望の静電容量が得られるようスペーサ10bの厚みにより静電容量が調整される。なお、スペーサ10a,10bは同じ厚みとするが、必要に応じて異なった厚みであってもよい。   The thickness of the spacer 10a is obtained so that a desired capacitance can be obtained in the displacement detector 16a formed by the electrode 14a provided on one surface of the pendulum 6 and the surface 15a of the second housing 8 facing the electrode 14a. Thus, the electrostatic capacity is adjusted. Similarly, in the displacement detection unit 16b constituted by the electrode 14b provided on the other surface of the pendulum unit 6 and the surface 15b of the second housing 9, the capacitance varies depending on the thickness of the spacer 10b so that a desired capacitance can be obtained. Is adjusted. The spacers 10a and 10b have the same thickness, but may have different thicknesses as necessary.

このように、スペーサ10a,10bを用いることで、所望の静電容量を得るための調整が容易となる。なお、変位検出部16a,16bにおいて、ハウジング8,9の表面15a15bをアースにしている。   As described above, the use of the spacers 10a and 10b facilitates adjustment for obtaining a desired capacitance. In the displacement detectors 16a and 16b, the surfaces 15a15b of the housings 8 and 9 are grounded.

次いで、サーボ回路部3が第2ハウジング9に取り付けられる。また、コイル13aは金属薄板部材11の配線を兼ねる可撓部11c,11dを介してサーボ回路部3に接続される。変位検出部16a,16bの電極14a,14bは、電極配線部11e,11fを介してサーボ回路部3に接続される。   Next, the servo circuit unit 3 is attached to the second housing 9. The coil 13a is connected to the servo circuit unit 3 through flexible portions 11c and 11d that also serve as wiring of the thin metal plate member 11. The electrodes 14a and 14b of the displacement detectors 16a and 16b are connected to the servo circuit unit 3 via the electrode wiring units 11e and 11f.

次いで、図17に示すベース部材5に、結合用孔5aを用いてサーボ回路部3を取り付けたセンサ部2をネジで3点固定する。この際、ベース部材5に設けた3箇所の角度調整用ネジ孔5bを用いて、組立上発生する僅かな受感軸のずれを、ネジの進退調整によってベース部材5に対するセンサ部2の取り付け角度を変えることが容易にできるので、振子部6の位置補正が可能となる。   Next, the sensor part 2 to which the servo circuit part 3 is attached is fixed to the base member 5 shown in FIG. At this time, by using the three angle adjusting screw holes 5b provided in the base member 5, a slight shift of the sensitive shaft generated during assembly can be performed by adjusting the screw advance / retreat adjustment angle of the sensor unit 2 with respect to the base member 5. Therefore, the position of the pendulum unit 6 can be corrected.

次いで、センサ部2を固定したベース部材5に結合用孔5cを用いてケース4をネジで4点固定する。ケース4は、外形状が略直方体形状であるが、円筒形状であってもよい。材料はアルミニウムを用いることで、シールド効果によりノイズの発生及びノイズの影響を低減しつつ、軽量化でき、安価である。磁性材料であれば、磁気ノイズの影響を低減できる。使用条件下で変形がなく、温度などに対して安定であればエンジニアリングプラスチックも使用してもよい。所望により選択すればよい。   Next, the case 4 is fixed to the base member 5 to which the sensor unit 2 is fixed at four points with screws using the coupling holes 5c. Although the outer shape of the case 4 is a substantially rectangular parallelepiped shape, it may be a cylindrical shape. By using aluminum as the material, it is possible to reduce the weight and reduce the cost while reducing the generation of noise and the influence of noise by the shielding effect. If it is a magnetic material, the influence of magnetic noise can be reduced. Engineering plastics may be used as long as they do not deform under the conditions of use and are stable with respect to temperature. It may be selected as desired.

上記手順による組立作業のように、振子部6と枠部7を第1組立治具20と第2組治具21で挟んで締め付ける又は一定荷重により加圧し、接着剤18を加熱硬化するので、振子部6と枠部7はほとんど同一平面になり、所定の厚みのスペーサ10a,10bを枠部7とハウジング8,9との間に夫々挟むことにより要求する静電容量を容易に設定することができる。   Since the pendulum part 6 and the frame part 7 are sandwiched and clamped between the first assembly jig 20 and the second assembly jig 21 as in the assembly work according to the above procedure, or the adhesive 18 is heated and cured, The pendulum part 6 and the frame part 7 are almost on the same plane, and the required capacitance can be easily set by sandwiching spacers 10a and 10b having a predetermined thickness between the frame part 7 and the housings 8 and 9, respectively. Can do.

また、振子部6及び枠部7にプリント基板12a,12b,17a,17bを用いた構成であっても、−50℃〜100℃の耐熱性を得ることができるので、地震計の要求仕様に対しても十分な温度範囲が得られる。   Moreover, even if it is the structure which used the printed circuit boards 12a, 12b, 17a, 17b for the pendulum part 6 and the frame part 7, since the heat resistance of -50 degreeC-100 degreeC can be obtained, it is in the required specification of a seismometer. A sufficient temperature range can be obtained.

本発明によれば、安価な構成部品で、且つ組立作業・調整作業が容易なサーボ式加速度センサを提供することができる。   According to the present invention, it is possible to provide a servo-type acceleration sensor that is an inexpensive component and can be easily assembled and adjusted.

1…サーボ式加速度センサ、2…センサ部、3…サーボ回路部、4…ケース、5…ベース部材、6…振子部、6a…凸部、7…枠部、7a…切り欠き部、8…第1ハウジング、9…第2ハウジング、10a,10b…スペーサ、11…金属薄板部材、11a…振子側部位、11b…枠部側部位、11c,11d…可撓部、11e,11f…電極配線部、11g,12c,17c…ガイド孔、12d,21a…貫通孔、12a,12b…振子部用プリント基板、13a,13b…コイル、14a,14b…電極、15a,15b…表面、16a,16b…変位検出部、17a,17b…枠部用プリント基板、18…接着剤、20…第1組立治具、20a…ネジ穴、20b…ガイドピン、21…第2組立治具、21b…ガイド穴、22…締付ボルト。   DESCRIPTION OF SYMBOLS 1 ... Servo type acceleration sensor, 2 ... Sensor part, 3 ... Servo circuit part, 4 ... Case, 5 ... Base member, 6 ... Pendulum part, 6a ... Convex part, 7 ... Frame part, 7a ... Notch part, 8 ... 1st housing, 9 ... 2nd housing, 10a, 10b ... Spacer, 11 ... Metal thin plate member, 11a ... Pendulum side part, 11b ... Frame part side part, 11c, 11d ... Flexible part, 11e, 11f ... Electrode wiring part 11g, 12c, 17c ... guide holes, 12d, 21a ... through holes, 12a, 12b ... pendulum printed circuit boards, 13a, 13b ... coils, 14a, 14b ... electrodes, 15a, 15b ... surface, 16a, 16b ... displacement Detection part, 17a, 17b ... Printed circuit board for frame part, 18 ... Adhesive, 20 ... First assembly jig, 20a ... Screw hole, 20b ... Guide pin, 21 ... Second assembly jig, 21b ... Guide hole, 22 ... Tightening bolt .

Claims (5)

加速度に応じて変位する振子部と、この振子部を支持する枠部と、振子部の変位を静電容量の変化で検知する変位検出部と、この変位検出部が検知した静電容量の変化量に基づき、前記振子部に設けたコイルに前記振子部の変位を制御する電流を供給するサーボ回路部を備え、このサーボ回路部が供給する電流を加速度として出力するサーボ式加速度センサであって、金属薄板部材を一対の振子部用プリント基板と一対の枠部用プリント基板により挟んで前記振子部と前記枠部を形成すると共に、前記振子部の表面と前記枠部の表面が同一平面になるように構成し、前記振子部は前記金属薄板部材を介して前記枠部に支持され、前記金属薄板部材に前記変位検出部の電極配線部とコイルの配線部を兼ねる可撓部を形成することを特徴とするサーボ式加速度センサ。 A pendulum part that is displaced according to acceleration, a frame part that supports the pendulum part, a displacement detection part that detects displacement of the pendulum part by a change in capacitance, and a change in capacitance detected by the displacement detection part A servo-type acceleration sensor that includes a servo circuit unit that supplies a current for controlling the displacement of the pendulum unit to a coil provided in the pendulum unit, and outputs the current supplied by the servo circuit unit as an acceleration, The pendulum part and the frame part are formed by sandwiching a thin metal plate member between a pair of pendulum printed boards and a pair of frame printed boards, and the surface of the pendulum part and the surface of the frame part are flush with each other The pendulum part is supported by the frame part via the metal thin plate member, and a flexible part that serves as both the electrode wiring part of the displacement detection part and the coil wiring part is formed on the metal thin plate member. It is characterized by Bo type acceleration sensor. 請求項1に記載のサーボ式加速度センサにおいて、前記変位検出部は、前記一対の振子部用プリント基板に夫々形成された電極と、これらの電極に対向する各ハウジングにより構成され、前記各ハウジングの少なくとも一方は磁気回路を構成し、前記枠部と前記各ハウジングの間に挟装される各スペーサの厚みにより、前記変位検出部の電極間ギャップが設定されることを特徴とするサーボ式加速度センサ。 2. The servo acceleration sensor according to claim 1, wherein the displacement detection unit includes electrodes respectively formed on the pair of pendulum printed circuit boards and housings facing the electrodes. A servo-type acceleration sensor, wherein at least one of them constitutes a magnetic circuit, and a gap between the electrodes of the displacement detector is set by a thickness of each spacer sandwiched between the frame and each housing. . 請求項1又は2に記載のサーボ式加速度センサにおいて、前記振子部の先端側に凸部が形成されると共に、この凸部が臨む切り欠き部が前記枠部に形成され、前記凸部及び前記切り欠き部を構成する前記金属薄板部材は夫々前記振子部用プリント基板及び前記枠部用プリント基板より突出していることを特徴とするサーボ式加速度センサ。 3. The servo acceleration sensor according to claim 1, wherein a convex portion is formed on a tip side of the pendulum portion, and a notch portion facing the convex portion is formed in the frame portion, and the convex portion and the The servo-type acceleration sensor according to claim 1, wherein the thin metal plate member constituting the notch portion protrudes from the pendulum printed board and the frame printed board. 請求項1乃至請求項3のいずれかに記載のサーボ式加速度センサにおいて、前記電極配線部の少なくとも一部を曲げて形成することを特徴とするサーボ式加速度センサ。 4. The servo acceleration sensor according to claim 1, wherein at least a part of the electrode wiring portion is bent. 5. 請求項1乃至請求項4のいずれかに記載のサーボ式加速度センサにおいて、前記金属薄板部材の前記振子部用プリント基板と前記枠部用プリント基板に挟まれる面に、複数の微小孔が形成されることを特徴とするサーボ式加速度センサ。 5. The servo acceleration sensor according to claim 1, wherein a plurality of minute holes are formed on a surface of the metal thin plate member sandwiched between the pendulum printed circuit board and the frame printed circuit board. Servo-type acceleration sensor characterized by that.
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