JPS6239399Y2 - - Google Patents
Info
- Publication number
- JPS6239399Y2 JPS6239399Y2 JP17629178U JP17629178U JPS6239399Y2 JP S6239399 Y2 JPS6239399 Y2 JP S6239399Y2 JP 17629178 U JP17629178 U JP 17629178U JP 17629178 U JP17629178 U JP 17629178U JP S6239399 Y2 JPS6239399 Y2 JP S6239399Y2
- Authority
- JP
- Japan
- Prior art keywords
- detection
- potential
- dielectric
- width
- surface potential
- 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
- 238000001514 detection method Methods 0.000 claims description 64
- 238000000034 method Methods 0.000 claims description 4
- 239000003989 dielectric material Substances 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims 3
- 108091008695 photoreceptors Proteins 0.000 description 17
- 230000002159 abnormal effect Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 2
- 206010034972 Photosensitivity reaction Diseases 0.000 description 1
- 239000002800 charge carrier Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000036211 photosensitivity Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Description
【考案の詳細な説明】
本考案は表面電位検出装置に関し、さらに詳し
くは、電荷保持体に導電性の検出部材を接触せし
め、この検出部材に流れる電流により表面電位を
検出するタイプの表面電位検出装置に関するもの
である。[Detailed Description of the Invention] The present invention relates to a surface potential detection device, and more specifically, a type of surface potential detection device in which a conductive detection member is brought into contact with a charge carrier and the surface potential is detected by a current flowing through the detection member. It is related to the device.
誘電体の表面電位を測定する方法あるいは装置
として、従来から象限型、振動容量型、回転セク
ター型、静電誘導型等のものが提案あるいは提供
されている。 As methods or devices for measuring the surface potential of a dielectric material, methods such as a quadrant type, a vibration capacitance type, a rotating sector type, and an electrostatic induction type have been proposed or provided.
一方、電子写真複写機の分野においては、電子
写真感光体の帯電、露光後の表面電位が複写画像
に大きな影響を与えることから、例えば米国特許
第3887845号同第4000944号等に示される如く、感
光体の表面電位を測定することにより帯電量を制
御する技術が知られている。 On the other hand, in the field of electrophotographic copying machines, since the charging of the electrophotographic photoreceptor and the surface potential after exposure have a large effect on the copied image, as shown in, for example, U.S. Pat. No. 3,887,845 and U.S. Pat. A technique for controlling the amount of charge by measuring the surface potential of a photoreceptor is known.
上記米国特許第3887845号に示されるものは、
導電性の検出素子を感光体表面に接触せしめ、感
光体の移動に伴つて検出素子に流れる電流により
表面電位に対応した信号を得るもので、検出信号
が大きく、測定回路も比較的簡単であり、検出素
子と感光体表面との距離変動に伴う検出誤差を生
じないという利点を有しているが、反面、感光体
表面から検出素子に流れる電流が表面電位だけで
なく周囲温湿度によつても変化し、それによる検
出誤差を生じるという欠点あるいは、検出素子に
異常放電による電流が流れ、これによつて検出誤
差を生じるという欠点があつた。 What is shown in the above US Pat. No. 3,887,845 is
A conductive detection element is brought into contact with the surface of the photoreceptor, and a signal corresponding to the surface potential is obtained by the current flowing through the detection element as the photoreceptor moves.The detection signal is large and the measurement circuit is relatively simple. This has the advantage of not causing detection errors due to changes in the distance between the sensing element and the surface of the photoreceptor, but on the other hand, the current flowing from the surface of the photoreceptor to the sensing element depends not only on the surface potential but also on the ambient temperature and humidity. However, there are disadvantages in that the voltage also changes, resulting in a detection error, or that a current due to abnormal discharge flows through the detection element, thereby causing a detection error.
この周囲温湿度の変化による検出誤差に関して
は、本考案の出願人からすでに特願昭53−68165
号としてその解決手段が出願されているが、その
中で、上記異常放電による検出誤差に関しては、
検出素子の直前で電位を下げる露光を行い、検出
素子と感光体ベース間にバイアス電圧を印加する
等の対策を行なつている。 Regarding detection errors due to changes in ambient temperature and humidity, the applicant of the present invention has already filed a patent application No. 53-68165.
A solution to this problem has been filed as No. 1, but regarding the detection error due to the above abnormal discharge,
Measures are taken such as performing exposure to lower the potential just before the detection element and applying a bias voltage between the detection element and the photoreceptor base.
また、上記米国特許第3887845号あるいは特開
昭53−95636号等に示される接触型の表面電位検
出装置においてはこのような異常放電による検出
誤差は全く問題にされていないが、このことは、
検出すべき表面電位ＶSと検出素子への印加電圧
ＶBとの電位差ＶGが、異常放電を生じない電位で
あるという前提の上に考えられていることに起因
する。 Furthermore, in the contact type surface potential detection device disclosed in the above-mentioned US Pat.
This is due to the assumption that the potential difference V G between the surface potential V S to be detected and the voltage V B applied to the detection element is a potential that does not cause abnormal discharge.
しかしながら、感光体の使用条件や周囲環境等
によつては異常放電は無視できない問題であり、
また、上記本件出願人の示した対策によつても感
光体の初期表面電位や感光体の光感度等に対し、
環境条件によつては検出許容巾をこえることが起
こり得、十分な対策とは言えなかつた。 However, depending on the usage conditions of the photoreceptor and the surrounding environment, abnormal discharge is a problem that cannot be ignored.
Furthermore, even with the above-mentioned measures suggested by the applicant, the initial surface potential of the photoreceptor, the photosensitivity of the photoreceptor, etc.
Depending on the environmental conditions, the detection tolerance could be exceeded, and this could not be considered a sufficient countermeasure.
本考案はこのような点に着目してなされたもの
で、検出素子に対する異常放電を防止することに
より検出許容巾の上限を考慮することなく表面電
位の検出を実行できる表面電位検出装置を提供す
ることを目的とするものである。 The present invention has been made with attention to these points, and an object of the present invention is to provide a surface potential detection device that can perform surface potential detection without considering the upper limit of the detection tolerance by preventing abnormal discharge to the detection element. The purpose is to
以下、本考案の実施例を図面に従つて説明す
る。まず、異常放電現象につき第１図ａ，ｂを用
いて説明する。誘電体１は例えば矢印Ａ方向に駆
動されており、その進行方向に沿つて電位検出部
１ａが設けられ、帯電されている。この検出部１
ａ中において誘電体１表面に転接するように設け
られた検出素子２は導電性ゴム等の導電材で形成
され、軸２ａに接するブラシ３を介して検出回路
４に接続されている。 Embodiments of the present invention will be described below with reference to the drawings. First, the abnormal discharge phenomenon will be explained using FIGS. 1a and 1b. The dielectric 1 is driven, for example, in the direction of arrow A, and a potential detection section 1a is provided along the direction of movement of the dielectric 1, and is charged. This detection section 1
A detection element 2 provided in rolling contact with the surface of the dielectric 1 in a is made of a conductive material such as conductive rubber, and is connected to a detection circuit 4 via a brush 3 in contact with a shaft 2a.
このような構成において検出素子２には接触部
分から誘電体１表面上の検出部１ａの帯電電位に
対応した電流が流れ、検出回路４によつて電位が
検出されるものであるが、時として接触部分だけ
でなく、検出素子２の両側部に対し、その近傍の
電荷が放電されることがあり、これが異常放電と
呼ばれ、検出値には異常放電による誤差が生じ
る。 In such a configuration, a current corresponding to the charged potential of the detection part 1a on the surface of the dielectric 1 flows through the detection element 2 from the contact portion, and the potential is detected by the detection circuit 4. Charges in the vicinity of not only the contact portion but also both sides of the detection element 2 may be discharged, and this is called an abnormal discharge, and an error occurs in the detected value due to the abnormal discharge.
本考案者等は異常放電による検出誤差が、上述
した如く検出素子２の両側部に対し、その近傍の
電荷の放電により生じることを見出し、検出部１
ａの巾d1を検出素子２の巾d0より小さくすること
により上記異常放電を防止するようになした。以
下、その具体的な構成につき説明する。 The inventors of the present invention discovered that the detection error due to abnormal discharge occurs due to the discharge of charges in the vicinity of both sides of the detection element 2 as described above, and
By making the width d 1 of a smaller than the width d 0 of the detection element 2, the above-mentioned abnormal discharge is prevented. The specific configuration will be explained below.
第２図は電子写真感光体１０の表面電位を検出
する場合を示したもので、感光体１０はドラム状
に形成され、ドラムの回転に伴い、遂次帯電用チ
ヤージヤ１１によりその表面が帯電される。感光
体ドラム１０の一側部は電位検出部１０ａとして
設定され、帯電後、適宜露光手段によりＢ，Ｃで
示す位置で露光を行い、初期帯電電位V0に対
し、Ｂ，Ｃ位置の露光後の電位をV1までおと
す。このV1は感光体１０表面の電荷が検出素子
２に移動可能な最低電位Vthと同程度か、それ以
下となるように露光量を設定する。このＢ，Ｃ部
に対する露光後、露光されなかつた部分を検出部
として用い、この検出部１０ａの巾をd1とし、検
出素子２の巾d0との関係を
d0＞d1
となるように設定する。このときの表面電位の状
態を第３図に示す。 FIG. 2 shows the case of detecting the surface potential of the electrophotographic photoreceptor 10. The photoreceptor 10 is formed into a drum shape, and as the drum rotates, its surface is charged by a charger 11 for charging sequentially. Ru. One side of the photoreceptor drum 10 is set as a potential detection section 10a , and after being charged, it is exposed to light at the positions indicated by B and C using an appropriate exposure means. The potential of is lowered to V 1 . The exposure amount is set so that this V 1 is equal to or less than the lowest potential Vth at which the charge on the surface of the photoreceptor 10 can be transferred to the detection element 2 . After exposing parts B and C, the unexposed part is used as a detection part, the width of this detection part 10a is set as d 1 , and the relationship with the width d 0 of the detection element 2 is set so that d 0 > d 1 . Set to . The state of the surface potential at this time is shown in FIG.
このように検出部の巾d1と検出素子の巾d0との
関係を定めることにより上述した異常放電による
検出誤差は生じず、きわめて良好な電位検出を行
うことができた。 By determining the relationship between the width d 1 of the detection portion and the width d 0 of the detection element in this way, the detection error due to the above-mentioned abnormal discharge did not occur, and extremely good potential detection could be performed.
第４図に検出部１０ａの巾を規制する別実施例
を示す。 FIG. 4 shows another embodiment in which the width of the detection section 10a is restricted.
これは、帯電用チヤージヤ１１の下面にシール
ド板２０を設け、このシールド板２０に巾d1のス
リツト２０ａを設け、スリツト巾d1部分のみが帯
電されるようにしたもので、検出素子の巾d0との
関係はd0＞d1である。 A shield plate 20 is provided on the lower surface of the charging charger 11, and a slit 20a having a width d1 is provided in the shield plate 20, so that only the portion of the slit width d1 is charged, and the width of the detection element is The relationship with d 0 is d 0 > d 1 .
なお、上記実施例においては感光体ドラム１０
に対する初期帯電電位V0を測定する場合を示し
たが、これは画像露光後の表面電位Viを測定す
るようになしても良い。 Note that in the above embodiment, the photosensitive drum 10
Although the case is shown in which the initial charging potential V 0 is measured for the image, the surface potential Vi after image exposure may be measured.
また、感光体ドラム１０上の電位検出部１０ａ
はドラムの端部に設けると感光体の膜厚ムラや取
扱時の汚れ等が生じやすく電位測定に際して誤差
が生じやすいため、少し中央寄りに設けることが
好ましい。 Further, the potential detection section 10a on the photoreceptor drum 10
If it is provided at the end of the drum, unevenness in the film thickness of the photoreceptor, dirt during handling, etc. are likely to occur, and errors are likely to occur when measuring the potential. Therefore, it is preferable to provide it a little closer to the center.
さらに、上記実施例においては検出素子２とし
て誘電体表面に転接するローラ型のものを示した
が、これは金属等の接片を接触させるものでも良
く、また、検出素子２を通つて流れる電流により
表面電位を検出する回路等はその制御あるいは測
定の目的に応じて適宜決定すれば良く、特に本考
案実施例においては具体例は示さない。 Furthermore, in the above embodiment, a roller type element that contacts the dielectric surface is shown as the detection element 2, but it may also be a type that contacts a contact piece of metal or the like, and the current flowing through the detection element 2 may be The circuit for detecting the surface potential may be appropriately determined depending on the purpose of control or measurement, and no specific example is shown in the embodiments of the present invention.
また、上記第１の実施例において示したＢ，Ｃ
部に対する露光は、適宜光源に対しＢ，Ｃ部に対
応した開孔を有するマスク等を用いて達成でき、
光源としては複写機においては露光ランプ等を用
いても良く、また別に電位検出部用の光源を設け
ても良い。 In addition, B and C shown in the first embodiment above
Exposure to the parts can be achieved by using a mask or the like having openings corresponding to parts B and C for the light source as appropriate.
As a light source, an exposure lamp or the like may be used in the copying machine, or a separate light source for the potential detection section may be provided.
以上説明した如く本考案は誘電体表面の電位検
出部の巾d1と検出素子の巾d0との関係を、
d0＞d1
としたものであるから、検出素子の側部に対する
電荷の異常放電を生じず、このため検出誤差のな
い正確な表面電位の検出を行うことができる。 As explained above, in the present invention, the relationship between the width d 1 of the potential detection part on the dielectric surface and the width d 0 of the detection element is d 0 > d 1 , so the charge on the side of the detection element is Abnormal discharge does not occur, and therefore surface potential can be accurately detected without detection errors.
第１図ａ，ｂは従来装置の不都合点を説明する
ための図、第２図は本考案の１実施例を示す図、
第３図はその表面電位の状態を示す図、第４図は
本考案の別の実施例を示す図である。
１……誘電体、１ａ……検出部、２……検出素
子、４……検出回路、１０……感光体、１０ａ…
…検出部、Ｂ，Ｃ……露光位置、１１……帯電用
チヤージヤ、２０……シールド部材、２０ａ……
スリツト、d0……検出素子の巾、d1……検出部の
巾、V0……表面電位（初期帯電電位）。
Figures 1a and b are diagrams for explaining the disadvantages of the conventional device, Figure 2 is a diagram showing one embodiment of the present invention,
FIG. 3 is a diagram showing the state of the surface potential, and FIG. 4 is a diagram showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Dielectric, 1a... Detection part, 2... Detection element, 4... Detection circuit, 10... Photoreceptor, 10a...
...Detection section, B, C...Exposure position, 11...Chargeer for charging, 20...Shield member, 20a...
slit, d 0 ...Width of the detection element, d 1 ...Width of the detection section, V 0 ...Surface potential (initial charging potential).
Claims (1)
電手段の下流位置で、上記誘電体表面の電位
を、該表面に接触する導電性の検出素子に流れ
る電流値によつて検出するようになした表面電
位検出装置において、上記誘電体表面上におい
て電位検出部を設定すると共に、その巾d1を規
制する手段を設け、上記検出素子の巾d0との関
係を、d0＞d1となしたことを特徴とする表面電
位検出装置。 ２ 上記誘電体が光導電性を有する部材であり、
上記規制手段が、上記検出部の巾d1を残し、そ
の両側を露光する露光手段である実用新案登録
請求の範囲第１項記載の表面電位検出装置。 ３ 上記規制手段が上記誘電体を帯電する帯電手
段と誘電体との間に設けられ、上記巾d1のスリ
ツトを有するシールド部材である実用新案登録
請求の範囲第１項記載の表面電位検出装置。[Claims for Utility Model Registration] 1. At a downstream position of a charging means that charges the entire surface of a dielectric moving in one direction, the electric potential on the surface of the dielectric is determined by the value of a current flowing through a conductive detection element in contact with the surface. In a surface potential detecting device configured to detect a potential by a method, a potential detecting portion is set on the surface of the dielectric material, and a means for regulating the width d 1 of the potential detecting portion is provided, and the relationship with the width d 0 of the detecting element is provided. A surface potential detection device characterized in that d 0 > d 1 . 2 the dielectric is a member having photoconductivity;
2. The surface potential detection device according to claim 1 , wherein the regulating means is an exposure means for exposing both sides of the detection section, leaving a width d1 of the detection section. 3. The surface potential detection device according to claim 1, wherein the regulating means is a shield member provided between the charging means for charging the dielectric and the dielectric, and having a slit having the width d1 . .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17629178U JPS6239399Y2 (en) | 1978-12-21 | 1978-12-21 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17629178U JPS6239399Y2 (en) | 1978-12-21 | 1978-12-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5592143U JPS5592143U (en) | 1980-06-25 |
| JPS6239399Y2 true JPS6239399Y2 (en) | 1987-10-07 |
Family
ID=29184679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17629178U Expired JPS6239399Y2 (en) | 1978-12-21 | 1978-12-21 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6239399Y2 (en) |
-
1978
- 1978-12-21 JP JP17629178U patent/JPS6239399Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5592143U (en) | 1980-06-25 |
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