JPH0339594B2 - - Google Patents
Info
- Publication number
- JPH0339594B2 JPH0339594B2 JP58164584A JP16458483A JPH0339594B2 JP H0339594 B2 JPH0339594 B2 JP H0339594B2 JP 58164584 A JP58164584 A JP 58164584A JP 16458483 A JP16458483 A JP 16458483A JP H0339594 B2 JPH0339594 B2 JP H0339594B2
- Authority
- JP
- Japan
- Prior art keywords
- surface potential
- opening
- vibrating
- potential sensor
- shield case
- 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 - Lifetime
Links
- 238000005259 measurement Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 108091008695 photoreceptors Proteins 0.000 description 1
Landscapes
- Control Or Security For Electrophotography (AREA)
Description
【発明の詳細な説明】
本発明は、導体、絶縁体等の表面電位に非接触
にて検出、測定するための表面電位センサに関す
るものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a surface potential sensor for detecting and measuring the surface potential of conductors, insulators, etc. in a non-contact manner.
従来、各種分野において物体の表面電位を検出
し測定する必要がしばしばあり、特に、電子写真
複写機においては、良好な像形成を行なうための
プロセス制御を行なうため感光体ドラムの表面電
位を測定している。これらの表面電位を非接触に
て測定する表面電位計としては、従来種々ある
が、その一例として、添付図面の第１図に略示す
るような構成のものが提案されている。この従来
の表面電位計は、電位を測定すべき表面からシー
ルド部材１の開口２を通して測定電極３に受電さ
れる電気力線Ｅを、音叉振動片４に設けたチヨツ
プ電極５にてチヨツプして交流信号に変換し、測
定電極３に接続した電位検出回路６にて電位計の
出力としている。この従来の表面電位計は、被測
定面の表面電位を交流信号として取り出すための
チヨツパとして音叉を用いるので、チヨツピング
周波数の安定化、駆動源の低電力化、駆動機構の
簡素化、低価格化を図れるものであるが、シール
ド部材と測定電極との間にチヨツパ電極、音叉振
動片を設けているのでそれだけ表面電位計の全体
の厚さが増してしまい、また、部品数もそれだけ
多くなつてしまう。 Conventionally, it has often been necessary to detect and measure the surface potential of objects in various fields, and in particular, in electrophotographic copying machines, it has been necessary to measure the surface potential of the photoreceptor drum in order to control the process to ensure good image formation. ing. There are various types of surface electrometers that measure these surface potentials in a non-contact manner, and one example of such a structure has been proposed as schematically shown in FIG. 1 of the accompanying drawings. This conventional surface electrometer chops electric lines of force E, which are received from the surface whose potential is to be measured through the opening 2 of the shield member 1 and into the measurement electrode 3, with a tip electrode 5 provided on the tuning fork vibrating piece 4. The signal is converted into an alternating current signal and outputted from a potential meter by a potential detection circuit 6 connected to the measurement electrode 3. This conventional surface potential meter uses a tuning fork as a chopper to extract the surface potential of the surface to be measured as an alternating current signal, which stabilizes the chopping frequency, reduces the power consumption of the drive source, simplifies the drive mechanism, and lowers the price. However, since a chopper electrode and a tuning fork vibrating piece are provided between the shield member and the measuring electrode, the overall thickness of the surface electrometer increases accordingly, and the number of parts also increases accordingly. Put it away.
本発明の目的は、前述したような問題点を解消
し、薄型で部品数の少ない安価な表面電位センサ
を提供することである。 An object of the present invention is to solve the above-mentioned problems and provide a thin and inexpensive surface potential sensor with a small number of parts.
本発明による表面電位センサは、頂面部の間に
開口部を作り出している一対の側面部材を備えて
いて、その側面部材の少なくとも一方は振動可能
なものとされているシールドケースと、該シール
ドケース内に前記開口部に面して設けられその開
口部を通して入射される電気力線を受ける測定電
極と、前記開口部の開口面積が変化し前記測定電
極の受電する電気力線数が変化するように前記振
動可能な側面部材を振動させるための駆動手段と
を備えたことを特徴とする。 A surface potential sensor according to the present invention includes a shield case including a pair of side members creating an opening between the top surfaces, at least one of the side members being able to vibrate, and the shield case. A measurement electrode is provided facing the opening and receives lines of electric force incident through the opening, and the opening area of the opening changes to change the number of lines of electric force received by the measurement electrode. and a driving means for vibrating the vibrating side member.
次に、添付図面の第２図、第３図及び第４図に
基づいて本発明の実施例について本発明をより詳
細に説明する。 Next, the present invention will be described in more detail with respect to embodiments of the present invention based on FIGS. 2, 3, and 4 of the accompanying drawings.
第２図は、本発明の一実施例としての表面電位
センサを概略的に示す斜視図であり、第３図は第
２図の表面電位センサの動作を説明するための概
略図である。この実施例の表面電位センサは、シ
ールドケース１０と、このシールドケース１０内
に配設された測定電極１１とを備えている。シー
ルドケース１０は、正面板１０Ａ及び背面板１０
Ｂと、振動可能な一対の側面部材１０Ｃ及び１０
Ｄとを備えており、側面部材１０Ｃ及び１０Ｄの
頂面部の間には、開口部１２が作り出されてい
る。この表面電位センサは、更に、シールド部材
である側面部材１０Ｃ及び１０Ｄにそれぞれ作用
してこれらを振動させるための圧電素子１３を備
えている。これら圧電素子１３は、適当な駆動回
路１４にて付勢され、側面部材１０Ｃ及び１０Ｄ
を振動させ、開口部１２を第３図に矢印Ａで示す
如く所定の繰返し周期にて振動させる。このよう
な圧電素子の代りに電磁コイルを用いて電磁作用
にて開口部を振動させるようにしてもよい。 FIG. 2 is a perspective view schematically showing a surface potential sensor as an embodiment of the present invention, and FIG. 3 is a schematic diagram for explaining the operation of the surface potential sensor of FIG. 2. The surface potential sensor of this embodiment includes a shield case 10 and a measurement electrode 11 disposed within the shield case 10. The shield case 10 includes a front plate 10A and a back plate 10.
B, and a pair of side members 10C and 10 that can vibrate.
D, and an opening 12 is created between the top surfaces of the side members 10C and 10D. This surface potential sensor further includes piezoelectric elements 13 that act on the side members 10C and 10D, which are shield members, to vibrate them. These piezoelectric elements 13 are energized by a suitable drive circuit 14, and the side members 10C and 10D
is vibrated, and the opening 12 is vibrated at a predetermined repetition period as shown by arrow A in FIG. Instead of such a piezoelectric element, an electromagnetic coil may be used to cause the opening to vibrate by electromagnetic action.
このような実施例は表面電位センサの動作につ
いて、特に、第３図を参照して説明する。電位を
測定すべき表面からの電気力線Ｅは、シールド部
材１０Ｃ及び１０Ｄ間の開口部１２を通してシー
ルドケース１０内に入射して、測定電極１１に受
電され、測定電極１１に接続した電位検出回路１
５にてその表面電位を表わす信号とされる。ここ
で、開口部１２は、駆動回路１４によつて付勢さ
れる圧電素子１３の作用によつてシールド部材１
０Ｃ及び１０Ｄが振動させられることによつて、
矢印Ａで示す如くくり返し振動させられ、その開
口面積が周期的に変化させられている。従つて、
被測定表面からの電気力線が一定であつても、開
口部１２を通して入射される電気力線数は、その
開口部の振動による開口面積の周期的変化に応じ
て変化し、測定電極１１によつて受電される電気
力線数も同様に変化し、交流信号に変換されるこ
とになる。電位検出回路１５は、このような交流
信号を処理して、測定電位を表わす信号を出力す
るのである。 These embodiments will be described with particular reference to FIG. 3 regarding the operation of the surface potential sensor. Lines of electric force E from the surface whose potential is to be measured enters the shield case 10 through the opening 12 between the shield members 10C and 10D, is received by the measurement electrode 11, and is sent to the potential detection circuit connected to the measurement electrode 11. 1
5 is used as a signal representing the surface potential. Here, the opening 12 is formed in the shield member 1 by the action of the piezoelectric element 13 energized by the drive circuit 14.
By vibrating 0C and 10D,
It is repeatedly vibrated as shown by arrow A, and its opening area is changed periodically. Therefore,
Even if the lines of electric force from the surface to be measured are constant, the number of lines of electric force incident through the aperture 12 changes according to periodic changes in the aperture area due to the vibration of the aperture, and Therefore, the number of electric lines of force received also changes in the same way, and is converted into an alternating current signal. The potential detection circuit 15 processes such an alternating current signal and outputs a signal representing the measured potential.
第４図は、本発明の別の実施例としての表面電
位センサを示す第３図と同様の図である。この実
施例の、表面電位センサは、第２図及び第３図の
実施例においては、シールド部材としての側面板
１０Ｃ及び１０Ｄがほゞ逆Ｌ字状に曲折されたも
のであるのに対し、シールド部材としての側面板
１０C′及び１０D′がほゞくの字状に曲折されたも
のである点を除けば、第２図及び第３図の実施例
のものと同様の構成であり、同様に動作するもの
である。 FIG. 4 is a diagram similar to FIG. 3 showing a surface potential sensor as another embodiment of the present invention. In the surface potential sensor of this embodiment, in contrast to the embodiments shown in FIGS. 2 and 3, the side plates 10C and 10D serving as shield members are bent into an approximately inverted L shape. The structure is similar to that of the embodiment shown in FIGS. 2 and 3, except that the side plates 10C' and 10D' serving as shield members are bent into a substantially dogleg shape. It is something that works.
本発明の表面電位センサは、前述したようにシ
ールド部材の開口部を直接的に振動させるものな
ので、シールド部材の開口と測定電極との間にチ
ヨツパ電極等の特別な部品を全く必要としていな
いのであるから、センサ全体の厚みを小さくでき
部品数も減少させることができるので安価なもの
とされる。 As mentioned above, the surface potential sensor of the present invention directly vibrates the opening of the shield member, so there is no need for any special parts such as a chopper electrode between the opening of the shield member and the measurement electrode. Because of this, the overall thickness of the sensor can be reduced and the number of parts can be reduced, making it inexpensive.
第１図は従来提案されている表面電位計の一例
を示す概略図、第２図は本発明の一実施例として
の表面電位センサの概略斜視図、第３図は第２図
の表面電位センサの動作を説明するための概略
図、第４図は本発明の別の実施例としての表面電
位センサを示す第３図と同様の図である。
１０……シールドケース、１０Ｃ，１０Ｄ……
側面部材、１１……測定電極、１２……開口部、
１３……圧電素子、１４……圧電素子駆動回路、
１５……電位検出回路。
Figure 1 is a schematic diagram showing an example of a conventionally proposed surface potential meter, Figure 2 is a schematic perspective view of a surface potential sensor as an embodiment of the present invention, and Figure 3 is the surface potential sensor of Figure 2. FIG. 4 is a diagram similar to FIG. 3 showing a surface potential sensor as another embodiment of the present invention. 10...Shield case, 10C, 10D...
Side member, 11... measurement electrode, 12... opening,
13...Piezoelectric element, 14...Piezoelectric element drive circuit,
15... Potential detection circuit.
Claims (1)
側面部材を備えていて、その側面部材の少なくと
も一方は振動可能なものとされているシールドケ
ースと、該シールドケース内に前記開口部に面し
て設けられその開口部を通して入射される電気力
線を受ける測定電極と、前記開口部の開口面積が
変化し前記測定電極の受電する電気力線数が変化
するように前記振動可能な側面部材を振動させる
ための駆動手段とを備えたことを特徴とする表面
電位センサ。 ２ 前記駆動手段は、前記振動可能な側面部材に
作用する圧電素子を含む特許請求の範囲第１項記
載の表面電位センサ。 ３ 前記駆動手段は、前記振動可能な側面部材に
作用する電磁コイルを含む特許請求の範囲第１項
記載の表面電位センサ。[Claims] 1. A shield case comprising a pair of side members creating an opening between top surfaces, at least one of which is capable of vibrating; and an interior of the shield case. a measurement electrode that is provided facing the opening and receives lines of electric force incident through the opening; A surface potential sensor comprising: a driving means for vibrating the vibrating side member. 2. The surface potential sensor according to claim 1, wherein the driving means includes a piezoelectric element that acts on the vibrating side member. 3. The surface potential sensor according to claim 1, wherein the driving means includes an electromagnetic coil that acts on the vibrating side member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58164584A JPS6055274A (en) | 1983-09-06 | 1983-09-06 | Surface potential sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58164584A JPS6055274A (en) | 1983-09-06 | 1983-09-06 | Surface potential sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6055274A JPS6055274A (en) | 1985-03-30 |
| JPH0339594B2 true JPH0339594B2 (en) | 1991-06-14 |
Family
ID=15795945
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58164584A Granted JPS6055274A (en) | 1983-09-06 | 1983-09-06 | Surface potential sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6055274A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4965478A (en) * | 1988-09-02 | 1990-10-23 | Mitsuba Electric Mfg. Co., Ltd. | DC motor with a durable pigtail arrangement |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5780570A (en) * | 1980-11-07 | 1982-05-20 | Matsushita Electric Ind Co Ltd | Measuring device for surface potential |
-
1983
- 1983-09-06 JP JP58164584A patent/JPS6055274A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5780570A (en) * | 1980-11-07 | 1982-05-20 | Matsushita Electric Ind Co Ltd | Measuring device for surface potential |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6055274A (en) | 1985-03-30 |
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