JPH0345237Y2 - - Google Patents
Info
- Publication number
- JPH0345237Y2 JPH0345237Y2 JP11108784U JP11108784U JPH0345237Y2 JP H0345237 Y2 JPH0345237 Y2 JP H0345237Y2 JP 11108784 U JP11108784 U JP 11108784U JP 11108784 U JP11108784 U JP 11108784U JP H0345237 Y2 JPH0345237 Y2 JP H0345237Y2
- Authority
- JP
- Japan
- Prior art keywords
- potential
- developing
- photoreceptor
- development
- screen grid
- 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
- 239000002344 surface layer Substances 0.000 claims description 2
- 108091008695 photoreceptors Proteins 0.000 description 25
- 230000007423 decrease Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
Landscapes
- Developing For Electrophotography (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は帯電装置としてスコロトロン帯電装置
を備えた電子写真装置に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electrophotographic apparatus equipped with a scorotron charging device as a charging device.
電子写真装置の帯電装置として、従来よりコロ
トロン帯電装置とスコロトロン帯電装置が知られ
ているが、この両者のうち、特にスコロトロン帯
電装置は帯電量を安定して得ることができるとい
う特長を有している。
As charging devices for electrophotographic devices, corotron charging devices and scorotron charging devices are conventionally known, but of these two, the scorotron charging device in particular has the advantage of being able to obtain a stable amount of charge. There is.
このスコロトロン帯電装置は、共立出版株式会
社発行の電子写真（R.M・シヤフアート著・井
上英一訳）に示されているように、コロナワイヤ
と感光体の間にスクリーングリツドを配置し、グ
リツド電位のコントロールによつてコロナ電流が
感光体とグリツドに分れて流れるようにしたもの
で、つまり換言すれば感光体表面の電位が高くな
るとグリツド電位が増加して、感光体表面の電位
をグリツド電位にほぼ等しく保つことができる。 This scorotron charging device has a screen grid placed between the corona wire and the photoreceptor, and the grid potential is The corona current is divided into the photoconductor and grid by controlling can be kept approximately equal to.
ところで、現像工程を反転現像で行う電子写真
装置の場合、感光体の表面電位と現像ローラの電
位（以下現像電位という）が一致する領域つまり
帯電後に光照射されなかつた領域では、現像工程
でトナーが付着せず、後続の転写工程及び定着工
程を経て出力される画像の白地となる。逆に、光
照射された領域では、表面電位がほぼ零電位とな
つてトナーが付着する。 By the way, in the case of an electrophotographic apparatus that performs the development process by reversal development, in the area where the surface potential of the photoreceptor and the potential of the development roller (hereinafter referred to as development potential) match, that is, the area that was not irradiated with light after charging, toner is removed during the development process. does not adhere, resulting in a white background in the image output through the subsequent transfer process and fixing process. On the other hand, in the area irradiated with light, the surface potential becomes almost zero potential and toner adheres thereto.
従つて、反転現像を行う場合、感光体の表面電
位と現像電位を一致させることが白地を保つため
に重要である。 Therefore, when performing reversal development, it is important to match the surface potential of the photoreceptor with the development potential in order to maintain a white background.
一方、このような反転現像を行う電子写真装置
では、画像濃度を変えるときに現像電位と感光体
の表面電位の両方を調整する必要がある。 On the other hand, in an electrophotographic apparatus that performs such reversal development, it is necessary to adjust both the development potential and the surface potential of the photoreceptor when changing the image density.
ところが、上述したスコロトロン帯電装置を有
していてかつ前記の反転現像を行う従来の電子写
真装置では、スコロトロン帯電装置と現像装置と
が各々独立して設けられているため、現像電位と
感光体の表面電位とを同時に変えることができ
ず、画像濃度を調整することが困難であるという
問題があつた。
However, in a conventional electrophotographic apparatus that has the above-mentioned scorotron charging device and performs the above-mentioned reversal development, the scorotron charging device and the developing device are each provided independently, so that the development potential and the photoreceptor are There was a problem that it was difficult to adjust the image density because the surface potential could not be changed at the same time.
本考案はこのような問題を解決するためになさ
れたもので、感光体の表面電位と現像電位を同時
に変えることができ、これにより画像濃度を容易
に変えることができる電子写真装置を実現するこ
とを目的とするものである。 The present invention was devised to solve these problems, and aims to realize an electrophotographic device that can simultaneously change the surface potential of the photoreceptor and the development potential, thereby easily changing the image density. The purpose is to
上述した目的を達成するため、本考案はスコロ
トロン現像装置を有しかつ現像ローラにより反転
現像を行う電子写真装置において、現像ローラに
現像電位を与える現像電位電源にスコロトロン帯
電装置のスクリーングリツドを接続したものであ
る。
In order to achieve the above-mentioned object, the present invention is an electrophotographic apparatus that has a scorotron developing device and performs reversal development using a developing roller, in which a screen grid of the scorotron charging device is connected to a developing potential power source that provides a developing potential to the developing roller. This is what I did.
上述した手段によれば、スクリーングリツドに
現像電位と同じ値の電位が与えられるため、現像
電位電源による現像電位を増減させると、それに
対応してスクリーングリツドの電位が増減し、そ
の結果感光体の表面電位も増減するので、現像電
位電源を調整するだけで画像濃度を変えることが
できる。
According to the above-mentioned means, a potential having the same value as the development potential is applied to the screen grid, so when the development potential by the development potential power supply is increased or decreased, the potential of the screen grid is increased or decreased correspondingly, and as a result, the photosensitive Since the surface potential of the body also increases or decreases, the image density can be changed simply by adjusting the development potential power source.
以下図面を参照して実施例を説明する。 Examples will be described below with reference to the drawings.
図面は本考案による電子写真装置の一実施例を
示す概略側面図で、図において１は感光ドラムで
あり、この感光ドラム１は接地された導電基材２
とその外周面を覆う表層として形成した感光体３
とで構成され、図示しない動力源により矢印方向
に回転するようになつている。 The drawing is a schematic side view showing an embodiment of an electrophotographic apparatus according to the present invention.
and a photoreceptor 3 formed as a surface layer covering its outer peripheral surface.
It is configured to rotate in the direction of the arrow by a power source (not shown).
４はスコロトロン帯電装置、９はレーザスキヤ
ナーまたはLEDアレイ等の光信号源、１０は現
像装置、１６はコロナ転写器、１７は除電用光
源、１８はクリーニング装置であり、これらは前
記感光ドラム１と対向するようにそれぞれ所定の
位置に配置されている。 4 is a scorotron charging device, 9 is an optical signal source such as a laser scanner or an LED array, 10 is a developing device, 16 is a corona transfer device, 17 is a light source for static elimination, and 18 is a cleaning device, which are connected to the photosensitive drum 1. They are each placed at a predetermined position so as to face each other.
前記スコロトロン帯電装置４はコロナワイヤ
５、該コロナワイヤ５と感光ドラム１の感光体３
との間に配置されたスクリーングリツド６及びこ
れらを支持するシヤーシ７により構成されてい
て、前記コロナワイヤ５は直流高圧電源８に接続
されている。 The scorotron charging device 4 includes a corona wire 5, and the corona wire 5 and the photoreceptor 3 of the photoreceptor drum 1.
The corona wire 5 is connected to a DC high voltage power source 8.
一方、現像装置１０はトナーホツパ１１、該ト
ナーホツパ１１内に収容されたトナー１２及び該
トナー１２を感光ドラム１との間の現像領域に搬
送する現像ローラ１３により構成されていて、こ
の現像ローラ１３は現像電位電源１４に接続され
ており、そしてこの現像電位電源１４にツエナー
ダイオード等の定電圧素子１５を介して前記スク
リーングリツド６が接続されている。 On the other hand, the developing device 10 includes a toner hopper 11, toner 12 contained in the toner hopper 11, and a developing roller 13 that conveys the toner 12 to a developing area between the photosensitive drum 1 and the developing roller 13. It is connected to a developing potential power source 14, and the screen grid 6 is connected to this developing potential power source 14 via a constant voltage element 15 such as a Zener diode.
次に本実施例の作用について説明する。 Next, the operation of this embodiment will be explained.
まず、動作開始により感光ドラム１が矢印方向
に回転し、スコロトロン帯電装置４のコロナワイ
ヤ５に直流高圧電源８からコロナ電流が付与され
てコロナ放電が行われる。このコロナ放電により
発生した静電荷はスクリーングリツド６の電位に
より制御され、感光体３の表面を一様に帯電させ
る。 First, upon the start of operation, the photosensitive drum 1 rotates in the direction of the arrow, and a corona current is applied from the DC high voltage power supply 8 to the corona wire 5 of the scorotron charging device 4 to perform corona discharge. The electrostatic charge generated by this corona discharge is controlled by the potential of the screen grid 6, and uniformly charges the surface of the photoreceptor 3.
この後、光信号源９が画像信号に応じて光を感
光体３に照射し、これにより感光体３上に静電潜
像が形成される。 Thereafter, the optical signal source 9 irradiates the photoreceptor 3 with light in accordance with the image signal, thereby forming an electrostatic latent image on the photoreceptor 3.
現像装置１０の現像ローラ１３はその外周面上
にトナー１２を保持して回転しており、これによ
りトナーホツパ１１内から感光ドラム１と現像ロ
ーラ１３との間の現像領域に現像に必要な充分な
量のトナー１２が順次搬送される。 The developing roller 13 of the developing device 10 rotates while holding the toner 12 on its outer peripheral surface, and as a result, sufficient amount of toner necessary for development is supplied from inside the toner hopper 11 to the developing area between the photosensitive drum 1 and the developing roller 13. amount of toner 12 is sequentially conveyed.
従つて、前記静電潜像が感光ドラム１の回転に
より現像領域に搬送されると、感光体３の表面電
位と現像電位電源１４により現像ローラ１３に与
えられている現像電位との電位差に応じて感光体
３の表面にトナー１２が付着し、静電潜像が現像
される。 Therefore, when the electrostatic latent image is conveyed to the developing area by the rotation of the photosensitive drum 1, the potential difference between the surface potential of the photosensitive member 3 and the developing potential given to the developing roller 13 by the developing potential power source 14 is applied. The toner 12 adheres to the surface of the photoreceptor 3, and an electrostatic latent image is developed.
こうして感光体３に付着したトナー１２は感光
ドラム１の回転によりコロナ転写器１６の位置に
送られ、ここでこのコロナ転写器１６により図示
しない用紙上に転写された後、該用紙と共に定着
器に送られて、該定着器により画像として定着さ
れた後、装置外へ出力される。 The toner 12 adhered to the photoconductor 3 in this way is sent to the position of the corona transfer device 16 by the rotation of the photoconductor drum 1, and after being transferred onto a sheet (not shown) by the corona transfer device 16, it is transferred together with the sheet to a fixing device. After being sent and fixed as an image by the fixing device, it is output outside the apparatus.
一方、トナー転写後の感光ドラム１はそのまま
回転を続け、除電用光源１７により光照射されて
感光体３の表面が一様にほぼ零電位に戻され、更
にクリーニング装置１８により残留トナーが除去
される。 On the other hand, the photosensitive drum 1 after the toner transfer continues to rotate as it is, and the surface of the photosensitive member 3 is uniformly returned to almost zero potential by being irradiated with light by the static eliminating light source 17, and the residual toner is further removed by the cleaning device 18. Ru.
上述した動作において、スコロトロン帯電装置
４により帯電される感光体３の表面電位は、スク
リーングリツド６の電位とほぼ等しくなることは
既に述べた通りである。このとき、直流高圧電源
８からのコロナ電流は充分与えられていて、これ
が感光体３とスクリーングリツド６に分れて流れ
るわけであるが、このスクリーングリツド６は前
記の如く定電圧素子１５を介して現像電位電源１
４に接続されている。 As mentioned above, in the above-described operation, the surface potential of the photoreceptor 3 charged by the scorotron charging device 4 becomes approximately equal to the potential of the screen grid 6. At this time, a sufficient amount of corona current is supplied from the DC high-voltage power supply 8, and this current is divided into the photoreceptor 3 and the screen grid 6, and the screen grid 6 is connected to the constant voltage element 15 as described above. Development potential power supply 1 via
Connected to 4.
従つて、現像電位電源１４の出力電位を増加さ
せると、現像電位のみでなく、同時にスクリーン
グリツド６の電位を増加させることができる。そ
のため、スクリーングリツド６に流れるコロナ電
流は減少し、感光体３に流れるコロナ電流が増加
して、感光体３の表面電位が前記出力電位の増加
分と同等の値だけ増加し、これにより現像電位と
感光体３の表面電位をほぼ一致させることができ
る。 Therefore, by increasing the output potential of the development potential power supply 14, it is possible to increase not only the development potential but also the potential of the screen grid 6 at the same time. Therefore, the corona current flowing through the screen grid 6 decreases, the corona current flowing through the photoreceptor 3 increases, and the surface potential of the photoreceptor 3 increases by a value equivalent to the increase in the output potential. The potential and the surface potential of the photoreceptor 3 can be made to substantially match.
このように本実施例では、現像ローラ１３に現
像電位を与える現像電位電源１４の出力電位を増
加させることによつて、現像電位とほぼ同等に感
光体３の表面電位を自動的に増加させることがで
き、これにより画像濃度を上げることができる。 As described above, in this embodiment, by increasing the output potential of the development potential power supply 14 that applies a development potential to the development roller 13, the surface potential of the photoreceptor 3 is automatically increased to be approximately equal to the development potential. This allows the image density to be increased.
無論、画像濃度を低下させる場合は、前記とは
逆に現像電位電源１４の出力電位を減少させれば
よく、こうすることによつてスクリーングリツド
６に流れるコロナ電流が増加し、感光体３に流れ
るコロナ電流が減少して、該感光体３の表面電位
が現像電位とほぼ同等の値となるように減少す
る。 Of course, if the image density is to be lowered, the output potential of the developing potential power supply 14 can be reduced in the opposite manner to the above, and by doing so, the corona current flowing through the screen grid 6 is increased and the photoreceptor 3 is The corona current flowing through the photoreceptor 3 decreases, and the surface potential of the photoreceptor 3 decreases to a value approximately equal to the development potential.
尚、定電圧素子１５によつてスクリーングリツ
ド６に付加する定電圧は、感光体３の表面電位が
帯電位置から現像位置までに回転する間に暗減衰
によつて減衰する値を補うためのもので、一般の
セレン等の感光体を使用する場合には、この定電
圧素子１５の定電圧値は100V程度が適当である。 The constant voltage applied to the screen grid 6 by the constant voltage element 15 is used to compensate for the value that the surface potential of the photoreceptor 3 attenuates due to dark decay while rotating from the charging position to the developing position. However, when a general photoreceptor such as selenium is used, the constant voltage value of the constant voltage element 15 is suitably about 100V.
また、感光体３の暗減衰値が小さい場合は定電
圧素子１５による補正の必要がないので、スクリ
ーングリツド６を直接現像電位電源１４の出力側
に接続すればよい。 Further, if the dark attenuation value of the photoreceptor 3 is small, there is no need for correction by the constant voltage element 15, so the screen grid 6 may be directly connected to the output side of the developing potential power source 14.
以上説明したように本考案は、スコロトロン帯
電装置のスクリーングリツドを、現像ローラに現
像電位を与える現像電位電源に接続することによ
り、現像電位を増減させ、これと同時に感光体の
表面電位がほぼ等しい値だけ増減するようにして
いるため、反転現像を行う電子写真装置におい
て、現像電位を変化させるだけで、画像濃度の調
整を容易に行うことができるという効果がある。
As explained above, the present invention increases or decreases the developing potential by connecting the screen grid of the scorotron charging device to the developing potential power source that supplies the developing roller with the developing potential. Since the values are increased or decreased by the same value, the image density can be easily adjusted in an electrophotographic apparatus that performs reversal development by simply changing the development potential.
図面は本考案による電子写真装置の一実施例を
示す概略側面図である。
１：感光ドラム、３：感光体、４：スコロトロ
ン帯電装置、５：コロナワイヤ、６：スクリーン
グリツド、８：直流高圧電源、１０：現像装置、
１２：トナー、１３：現像ローラ、１４：現像電
位電源、１５：定電圧素子。
The drawing is a schematic side view showing an embodiment of an electrophotographic apparatus according to the present invention. 1: Photosensitive drum, 3: Photosensitive member, 4: Scorotron charging device, 5: Corona wire, 6: Screen grid, 8: DC high voltage power supply, 10: Developing device,
12: toner, 13: developing roller, 14: developing potential power source, 15: constant voltage element.
Claims (1)
ワイヤ及び該コロナワイヤと前記感光体との間に
設けられるスクリーングリツドを備えたスコロト
ロン帯電装置とを有し、かつ前記感光体上に形成
される静電潜像を現像ローラとトナーを備えた現
像装置により反転現像する電子写真装置におい
て、該現像装置の現像ローラに現像電位を与える
現像電位電源に前記スコロトロン帯電装置のスク
リーングリツドを接続したことを特徴とする電子
写真装置。 A photosensitive drum having a surface layer formed of a photosensitive member, a scorotron charging device including a corona wire and a screen grid provided between the corona wire and the photosensitive member, and a scorotron charging device formed on the photosensitive member. In an electrophotographic apparatus that reversely develops an electrostatic latent image using a developing device equipped with a developing roller and toner, the screen grid of the scorotron charging device is connected to a developing potential power source that provides a developing potential to the developing roller of the developing device. An electrophotographic device featuring:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11108784U JPS6127147U (en) | 1984-07-24 | 1984-07-24 | electrophotographic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11108784U JPS6127147U (en) | 1984-07-24 | 1984-07-24 | electrophotographic equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6127147U JPS6127147U (en) | 1986-02-18 |
| JPH0345237Y2 true JPH0345237Y2 (en) | 1991-09-25 |
Family
ID=30670197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11108784U Granted JPS6127147U (en) | 1984-07-24 | 1984-07-24 | electrophotographic equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6127147U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0725801Y2 (en) * | 1987-03-13 | 1995-06-07 | 富士ゼロックス株式会社 | Development bias voltage generator |
-
1984
- 1984-07-24 JP JP11108784U patent/JPS6127147U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6127147U (en) | 1986-02-18 |
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