JPS6336278Y2 - - Google Patents
Info
- Publication number
- JPS6336278Y2 JPS6336278Y2 JP17754582U JP17754582U JPS6336278Y2 JP S6336278 Y2 JPS6336278 Y2 JP S6336278Y2 JP 17754582 U JP17754582 U JP 17754582U JP 17754582 U JP17754582 U JP 17754582U JP S6336278 Y2 JPS6336278 Y2 JP S6336278Y2
- Authority
- JP
- Japan
- Prior art keywords
- electrodes
- electrode
- sector
- differential amplifier
- motion
- 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.)
- Expired
Links
- 230000005611 electricity Effects 0.000 claims description 7
- 230000003068 static effect Effects 0.000 claims description 7
- 230000000737 periodic effect Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 description 8
- 230000001360 synchronised effect Effects 0.000 description 8
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Description
【考案の詳細な説明】
本考案はプラスチツク、紙、布、油などの静電
気を帯び易い物質の帯電状態を測定する静電気測
定器の改良に関する。[Detailed Description of the Invention] The present invention relates to an improvement in a static electricity meter for measuring the charged state of materials that are easily charged with static electricity, such as plastics, paper, cloth, and oil.
従来の静電気測定器を第１１図により説明すれ
ば、唯一枚の検出セクター電極板１″を帯電検体
１０に近づけて運動セクター３″で遮蔽、開放を
周期的に繰り返すことにより、検出セクター電極
１″に発生する検体１０の静電誘導による検出信
号は、交流電圧の形に変換される。上記検出信号
は高入力インピーダンスの交流増幅器４″に入力
するが、検出器自体からの同相モードノイズと一
緒に増幅せざるを得ない為、非常に雑音成分が大
きい。そして、バンドパス能動フイルター１１″
にて電源ノイズを除去し、同期信号発生器８″に
接続した同期検波器７″を介して表示装置５″に表
示する。 To explain the conventional electrostatic meter with reference to FIG. 11, the only detection sector electrode plate 1'' is brought close to the charged specimen 10 and the detection sector electrode 1 is periodically shielded and opened by the moving sector 3''. The detection signal generated by the electrostatic induction of the specimen 10 is converted into an AC voltage form. The detection signal is input to the high input impedance AC amplifier 4'', but it is separated by common mode noise from the detector itself. Since they have to be amplified together, the noise component is extremely large. And bandpass active filter 11″
Power supply noise is removed at the synchronous signal generator 8'', and the signal is displayed on the display device 5'' via the synchronous detector 7'' connected to the synchronous signal generator 8''.
上記のような静電気測定器では検出信号と同相
モードノイズを一緒に増幅してしまい、非常に雑
音成分が大きい。依つてＳ／Ｎ比が悪く測定精度
が悪かつた。 The static electricity measuring instrument described above amplifies the detection signal and common mode noise together, resulting in a very large noise component. Therefore, the S/N ratio was poor and the measurement accuracy was poor.
本考案は上記従来静電気測定器を改良する為に
なされたものでその目的とする処は、同相成分除
去比（CMRR）の高い差動増幅器を用いて、同
相モードノイズを除くことができると共に従来静
電気測定器の２倍の振幅の検出信号を得られる静
電気測定器を提供し、そのＳ／Ｎ比を改良し測定
精度を向上させることにある。 This invention was devised to improve the conventional electrostatic meter mentioned above, and its purpose is to eliminate common mode noise by using a differential amplifier with a high common mode component rejection ratio (CMRR). An object of the present invention is to provide a static electricity measuring device that can obtain a detection signal with twice the amplitude as that of a static electricity measuring device, and to improve its S/N ratio and measurement accuracy.
斯かる本考案の静電気測定器は、遮蔽、開放の
周期運動をする運動セクターに平行状対向する平
面上に、同一面積を有し交互に配列する第１電極
と第２電極とを設置して両電極より位相の反転し
た交流電圧を出力するようにすると共に、第１、
第２電極を差動増幅器に接続し、該差動増幅器に
帯電量を表示する表示装置を接続したことを特徴
とする。 The electrostatic meter of the present invention has first electrodes and second electrodes arranged alternately and having the same area on a plane facing parallel to a motion sector that undergoes periodic motion of shielding and opening. The first,
The second electrode is connected to a differential amplifier, and a display device that displays the amount of charge is connected to the differential amplifier.
すなわち、本考案の静電気測定器は周期運動す
る金属板製の運動セクターの一端を接地する。該
運動セクターの前面の自由空間におかれた帯電量
を測定する検体に対して、運動セクターの背面に
第１、第２電極を配置する。この第１、第２電極
は同一平面上にあり、互いに絶縁される。そして
運動セクターの平面と第１、第２電極の平面とは
平行に近接する。 That is, in the electrostatic meter of the present invention, one end of a periodic moving sector made of a metal plate is grounded. First and second electrodes are placed on the back side of the moving sector with respect to the specimen whose amount of charge is to be measured, which is placed in the free space in front of the moving sector. The first and second electrodes are on the same plane and are insulated from each other. The plane of the motion sector and the planes of the first and second electrodes are parallel and close to each other.
又、運動セクター第１、第２電極の各セクトは
同じ形で同じ面積を有した金属板よりなり、第
１、第２電極の各セクトは交互に配置するので
夫々同じ空間で仕切られる。 Further, each of the first and second motion sector electrodes is made of a metal plate having the same shape and the same area, and since each of the first and second electrode sectors is arranged alternately, they are partitioned by the same space.
この様にして帯電検体からの第１、第２電極へ
の電気力線は運動セクターの周期的な運動で遮
蔽、開放されて、第１、第２電極に夫々運動セク
ターの周期の基本波を含む交流電圧を発生する。 In this way, the lines of electric force from the charged specimen to the first and second electrodes are shielded and opened by the periodic motion of the moving sector, and the fundamental wave with the period of the moving sector is transmitted to the first and second electrodes, respectively. Generates an alternating current voltage containing
第１、第２電極の交互の配置から互いに位相の
反転した交流電圧を形成する。この交流電圧を差
動増幅器の反転と非反転入力端とに夫々結合する
ことにより、差動増幅器の入力構造と検出端への
結合インピーダンスのマツチングをとることによ
り同相モードノイズ（主に高入力インピーダンス
時の誘導ノイズ）を除去することが出来る。 Alternating current voltages having phases reversed to each other are formed from the alternating arrangement of the first and second electrodes. By coupling this AC voltage to the inverting and non-inverting input terminals of the differential amplifier, the input structure of the differential amplifier and the coupling impedance to the detection terminal are matched, thereby reducing common-mode noise (mainly due to high input impedance). (induced noise) can be removed.
この差動増幅器の出力から検体の帯電量に比例
した交流電圧を取出すことができるので、この差
動増幅器の出力を一般の交流電圧計の中の適切な
品種の電圧計を使用することにより直読出来る。 Since an AC voltage proportional to the amount of charge on the specimen can be extracted from the output of this differential amplifier, the output of this differential amplifier can be directly read by using an appropriate type of general AC voltmeter. I can do it.
本考案の第１実施例を第１図により説明すれ
ば、図中３は運動セクターであり、扇形を４個放
射状に配して一体状に形成した金属板の一端を接
地すると共に、該セクター３の中心をモーター６
に軸支て定速回転するようにする。 The first embodiment of the present invention will be explained with reference to FIG. 1. In the figure, reference numeral 3 represents a movement sector, and one end of a metal plate integrally formed with four fan shapes arranged radially is grounded, and the sector Motor 6 at the center of 3
Rotate at a constant speed with a shaft supported.
上記運動セクター３と略同形状に第１電極１を
形成すると共に、該第１電極を補完するように第
２電極２を同一平面上に並設し、両電極１，２の
検体１０と対面する面の面積が等しくなるように
する。両電極１，２の間には隙間を設けて互に絶
縁すると共に、両電極１，２が運動セクター３を
間において検体１０と対面するように構成し、両
電極１，２が検体１０に対して交互に遮蔽、開放
されるようにする。 A first electrode 1 is formed in substantially the same shape as the movement sector 3, and a second electrode 2 is arranged in parallel on the same plane to complement the first electrode, and both electrodes 1 and 2 face the specimen 10. Make sure that the areas of the faces are equal. A gap is provided between the electrodes 1 and 2 to insulate them from each other, and the electrodes 1 and 2 are configured to face the specimen 10 with the movement sector 3 between them. so that they are alternately shielded and opened.
上記第１、第２電極の一方は差動増幅器４の反
転入力端子に、他方は非反転入力端子に夫々接続
すると共に、該差動増幅器４の出力端子には表示
装置５を接続する。 One of the first and second electrodes is connected to the inverting input terminal of the differential amplifier 4, and the other to the non-inverting input terminal, and the display device 5 is connected to the output terminal of the differential amplifier 4.
而して上記第１実施例の静電気測定器の動作を
第５図乃至第７図により説明すれば、運動セクタ
ー３を回転しながら帯電した検体１０に対面する
と、第１第２電極１，２は交互に検体１０と対面
し静電誘導により交互に帯電して夫々180゜位相の
異なつた電圧a1，a2を生じる（第５，６図）。 The operation of the electrostatic meter of the first embodiment will be explained with reference to FIGS. 5 to 7. When facing the charged specimen 10 while rotating the motion sector 3, the first and second electrodes 1 and 2 alternately face the specimen 10 and are alternately charged by electrostatic induction, producing voltages a 1 and a 2 that are 180° out of phase (FIGS. 5 and 6).
該電圧a1，a2を夫々差動増幅器４の反転入力端
子、非反転入力端子に入力し、差動増幅器４の入
力と第１、第２電極１，２との結合インピーダン
スのマツチングをとることにより同相モードノイ
ズ（主に高入力インピーダンス時の誘導ノイズ）
を除去することができると共に、検体１０の帯電
量に比例した交流電圧ａを取出すことができる。
（第７図）。 The voltages a 1 and a 2 are input to the inverting input terminal and non-inverting input terminal of the differential amplifier 4, respectively, and the coupling impedance between the input of the differential amplifier 4 and the first and second electrodes 1 and 2 is matched. Common mode noise (mainly inductive noise at high input impedance)
can be removed, and an alternating current voltage a proportional to the amount of charge on the specimen 10 can be extracted.
(Figure 7).
上記交流電圧ａを表示装置５に入力して検体１
０の帯電重を読取れるようにする。表示装置５は
整流型電圧計、トランジスタボルトメータなどの
交流電圧計の適切なものを使用する。 The above AC voltage a is input to the display device 5 and the sample 1 is
Make it possible to read the 0 charge weight. As the display device 5, an appropriate AC voltmeter such as a rectifier voltmeter or a transistor voltmeter is used.
尚、以下に述べる実施例において同一構成のも
のについては同一記号で示し説明は省略する。 In the embodiments described below, components having the same configuration will be indicated by the same symbols and explanations will be omitted.
第２実施例を第２図により説明すれば、第２実
施例は第１実施例に同期信号発生器８と同期検波
器７を追加したものである。 The second embodiment will be explained with reference to FIG. 2. The second embodiment is obtained by adding a synchronizing signal generator 8 and a synchronizing detector 7 to the first embodiment.
電極１，２の一方、本実施例では第１電極１に
対する運動セクター３の遮蔽、開放の動作を基準
にして、開放をON、遮蔽をOFFに対応させた矩
形波ｂを同期信号とする（第８図）。このような
同期信号ｂを発生させる（光電式、静電式又は電
磁誘導式などの）チヨツパーよりなる同期信号発
生器８を運動セクター３の駆動軸に配設する。 One of the electrodes 1 and 2, in this embodiment, based on the shielding and opening operations of the motion sector 3 with respect to the first electrode 1, the synchronization signal is a rectangular wave b in which opening corresponds to ON and shielding corresponds to OFF. Figure 8). A synchronization signal generator 8 consisting of a chopper (of photoelectric type, electrostatic type, electromagnetic induction type, etc.) that generates such a synchronization signal b is arranged on the drive shaft of the movement sector 3.
同期検波器７は上記同期信号ｂと差動増幅器４
の出力端子ａを入力してなり、検体１０の帯電極
性と帯電量とを、極性が十の時は第９図のような
電圧ｃ、極性が一の時は第１０図のような電圧ｃ
にて出力する。 The synchronous detector 7 receives the synchronous signal b and the differential amplifier 4.
By inputting the output terminal a of
Output at .
表示装置５は指示計又はデイジタル表示回路な
どからなり、極性と電荷量にて帯電状態を表示す
る。 The display device 5 is composed of an indicator or a digital display circuit, and displays the charging state by polarity and amount of charge.
次に第３実施例を第３図により説明すれば、本
実施例は第２実施例の差動増幅器４と同期検波器
７との間にバンドバス能動フイルター１１を配設
したものである。 Next, a third embodiment will be described with reference to FIG. 3. In this embodiment, a bandpass active filter 11 is disposed between the differential amplifier 4 and the synchronous detector 7 of the second embodiment.
バンドパス能動フイルター１１はモーター６に
交流モーターを用いた時などに生じる電源誘導ノ
イズを除去するもので、検出した信号ａのみを通
すようになつている。尚、本実施例の動作は前記
第２実施例と同一である。 The bandpass active filter 11 removes power supply induced noise that occurs when an AC motor is used as the motor 6, and is designed to pass only the detected signal a. Note that the operation of this embodiment is the same as that of the second embodiment.
第４図は第４実施例を示し、図中１′は第１電
極、２′は第２電極であり、夫々櫛状に形成する
と共に、両電極１′，２′を隙間を開けて噛み合う
ように配設する。 FIG. 4 shows a fourth embodiment, in which 1' is a first electrode and 2' is a second electrode, each of which is formed in a comb shape, and both electrodes 1' and 2' are interlocked with a gap between them. Arrange it like this.
運動セクター３′は上記電極１′，２′のように
櫛状に形成すると共に、その先端を一体状に連結
して枠状に形成してなる。更に、該運動セクター
３′をバイブレータ６′，６′に支持させて、該運
動セクター３′が周期的に往復動するように構成
する。 The motion sector 3' is formed into a comb shape like the electrodes 1' and 2', and its tips are integrally connected to form a frame shape. Further, the motion sector 3' is supported by vibrators 6', 6' so that the motion sector 3' periodically reciprocates.
上記実施例は第１電極１′と第２電極２′が交互
に検体１０と対面するようになるので、第２実施
例と同様な電圧を発生し、第２実施例と同様に動
作する。 In the above embodiment, the first electrode 1' and the second electrode 2' alternately face the specimen 10, so that the same voltage as in the second embodiment is generated and the same operation as in the second embodiment is performed.
尚、本考案における周期運動とは上記実施例の
如く、往復運動、回転運動など任意である。 Incidentally, the periodic motion in the present invention is arbitrary, such as reciprocating motion and rotational motion, as in the above embodiments.
又、表示装置も単なるアナログ指示計に限らず
デジタル表示器でもよく任意である。 Further, the display device is not limited to a simple analog indicator, but may be any digital display.
本考案は以上のように、遮蔽、開放の周期運動
をする運動セクターに平行状対向する平面上に、
同一面積を有し交互に配列する第１電極と第２電
極とを設置して両電極より位相の反転した交流電
圧を出力するようにすると共に、第１、第２電極
を差動増幅器に接続し、該差動増幅器に帯電量を
表示する表示装置を接続してなる静電気測定器に
構成したので、同相モードノイズを除去してＳ／
Ｎ比を高めると共に、従来静電気測定器の２倍の
振幅の検出信号を得ることができる。従つて測定
精度を高めることができる。 As described above, the present invention is based on a plane parallel to and opposite to a motion sector that undergoes periodic motion of shielding and opening.
A first electrode and a second electrode having the same area and arranged alternately are installed so that an alternating current voltage with a reversed phase is output from both electrodes, and the first and second electrodes are connected to a differential amplifier. However, since the static electricity meter is configured by connecting a display device that displays the amount of charge to the differential amplifier, common mode noise can be removed and S/
In addition to increasing the N ratio, it is possible to obtain a detection signal with twice the amplitude of a conventional electrostatic meter. Therefore, measurement accuracy can be improved.
更に、差動増幅器には、市場に多品種出廻つて
いる高性能で安価なBi−FETオペアンプがBi−
MOS−FETオペアンプなどの中から選べるので
性能に対して割安に製作できる。 Furthermore, for differential amplifiers, there are many types of high-performance and inexpensive Bi-FET operational amplifiers on the market.
Since you can choose from MOS-FET operational amplifiers, etc., it can be manufactured at a relatively low price in terms of performance.
依つて所期の目的を達する。 By doing so, we will reach our intended purpose.
第１図乃至第４図は夫々第１乃至第４実施例の
原理図、第５図乃至第１０図は夫々電圧a1，a2，
ａ，ｂ，ｃ，c′のグラフ、第１１図は従来例の原
理図である。
図中、１，１′……第１電極、２，２′……第２
電極、３，３′……運動セクター、４……差動増
幅器、７……同期検波器、８……同期信号発生
器、５……表示装置、６……モーター、６′……
ソレノイドド、１０……検体である。
1 to 4 are principle diagrams of the first to fourth embodiments, respectively, and FIGS. 5 to 10 are voltages a 1 , a 2 ,
The graphs of a, b, c, c', and FIG. 11 are diagrams of the principle of the conventional example. In the figure, 1, 1'...first electrode, 2, 2'...second electrode
Electrode, 3, 3'... Motion sector, 4... Differential amplifier, 7... Synchronous detector, 8... Synchronous signal generator, 5... Display device, 6... Motor, 6'...
Solenoid, 10...specimen.
Claims (1)
行状対向する平面上に、同一面積を有し交互に配
列する第１電極と第２電極とを設置して両電極よ
り位相の反転した交流電圧を出力するようにする
と共に、第１、第２電極を差動増幅器に接続し、
該差動増幅器に帯電量を表示する表示装置を接続
してなる静電気測定器。 A first electrode and a second electrode, which have the same area and are arranged alternately, are installed on a plane facing parallel to a movement sector that undergoes periodic motion of shielding and opening, and an alternating current voltage with an inverted phase is transmitted from both electrodes. output, and connect the first and second electrodes to a differential amplifier,
A static electricity meter comprising a display device that displays the amount of charge connected to the differential amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17754582U JPS5984478U (en) | 1982-11-22 | 1982-11-22 | static electricity meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17754582U JPS5984478U (en) | 1982-11-22 | 1982-11-22 | static electricity meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5984478U JPS5984478U (en) | 1984-06-07 |
| JPS6336278Y2 true JPS6336278Y2 (en) | 1988-09-27 |
Family
ID=30385697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17754582U Granted JPS5984478U (en) | 1982-11-22 | 1982-11-22 | static electricity meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5984478U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007218693A (en) * | 2006-02-15 | 2007-08-30 | Canon Inc | Measuring device and image forming apparatus |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012242094A (en) * | 2011-05-16 | 2012-12-10 | Koganei Corp | Potential measuring device |
| WO2014045406A1 (en) * | 2012-09-21 | 2014-03-27 | 株式会社コガネイ | Potential measuring device |
| JP6818328B2 (en) * | 2018-10-12 | 2021-01-20 | 春日電機株式会社 | Static electricity measuring device |
-
1982
- 1982-11-22 JP JP17754582U patent/JPS5984478U/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007218693A (en) * | 2006-02-15 | 2007-08-30 | Canon Inc | Measuring device and image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5984478U (en) | 1984-06-07 |
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