JPH01180575A - Image forming device - Google Patents

Image forming device

Info

Publication number
JPH01180575A
JPH01180575A JP459588A JP459588A JPH01180575A JP H01180575 A JPH01180575 A JP H01180575A JP 459588 A JP459588 A JP 459588A JP 459588 A JP459588 A JP 459588A JP H01180575 A JPH01180575 A JP H01180575A
Authority
JP
Japan
Prior art keywords
contact
high voltage
image
potential
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.)
Pending
Application number
JP459588A
Other languages
Japanese (ja)
Inventor
Kumiko Izawa
井沢 くみこ
Hiroshi Tokunaga
洋 徳永
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Konica Minolta Inc
Original Assignee
Konica Minolta Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Konica Minolta Inc filed Critical Konica Minolta Inc
Priority to JP459588A priority Critical patent/JPH01180575A/en
Publication of JPH01180575A publication Critical patent/JPH01180575A/en
Pending legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09BORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B47/00Porphines; Azaporphines
    • C09B47/04Phthalocyanines abbreviation: Pc
    • C09B47/30Metal-free phthalocyanines
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09BORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B47/00Porphines; Azaporphines

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)

Abstract

PURPOSE:To prevent the occurrence of a malfunction by providing a means for turning OFF the corona discharge high voltage of an electrifier at the time of switching a grid potential. CONSTITUTION:An ON/OFF signal for turning ON and OFF to apply a high voltage to a discharge wire is supplied to a high voltage power source 7 from a control part 2, and the ON/OFF signal is outputted by interlocking with the output of a relay driving signal to a relay 3. That is the ON/OFF signal is outputted so that the high voltage to the discharge wire 9 becomes OFF immediately before the master contact (a) of the relay 3 is separated from a slave contact (b), and the high voltage becomes ON after the master contact (a) is brought into contact with the slave contact (c). Accordingly, in a floating state during the time when the master contact (a) is separated from the slave contact (b) and brought into contact with the slave contact (c), the high voltage is not applied to the discharge wire, therefore, an excessive discharge current does not flow. In such a way, even the generation of the malfunction in a copying device caused by the excessive discharge current does not occur.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、像形成体に一様帯電、像露光および現像を行
ってトナー像を形成し該トナー像を転写材へ転写した後
定着して画像を形成する画像形成装置の帯電手段の改良
に関する。
Detailed Description of the Invention (Industrial Field of Application) The present invention is directed to forming a toner image by uniformly charging an image forming body, exposing it to light and developing it, and then fixing the toner image after transferring it to a transfer material. The present invention relates to an improvement in a charging means of an image forming apparatus that forms an image.

(発明の背景) 従来、スコロトロン帯電器のグリッドを電気的に2つの
領域に区分し各領域に異なった電位を持たせる技術が知
られている(特開昭52−68425.特開昭57−6
7952)。
(Background of the Invention) Conventionally, a technique is known in which the grid of a scorotron charger is electrically divided into two regions and each region is given a different potential (JP-A-52-68425; JP-A-57- 6
7952).

また、スコロトロンのグリッドを区分せずに全体の電位
を高低切り替える技術が知られている(特開昭60−1
09193)。
In addition, a technique is known to switch the overall potential to high or low without dividing the scorotron grid (JP-A-60-1
09193).

しかしながら、スコロトロンのグリッドを区分する前記
技術においては区分の数が2個に限定されており且つそ
れぞれの電位が固定されているために、きめの細かいス
コロトロン電位の制御を行うことができないという問題
がある。
However, in the technique of dividing the scorotron grid, the number of divisions is limited to two and each potential is fixed, so there is a problem that fine control of the scorotron potential cannot be performed. be.

また、一方スコロトロンのグリッドを区分しないで全体
の電位を切り替える技術においては、グリッド電位を高
く設定することにより像形成体が帯電器の下へ進入した
ときの像形成体電位の立ち上がりを早くすることはでき
るが定常値が高くなり、逆に定常値を最適値に選択する
と定常値へ達するのが遅くなるという問題がある。
On the other hand, in the technique of switching the overall potential without dividing the scorotron grid, by setting the grid potential high, the rise of the potential of the image forming body when the image forming body enters under the charger is made faster. However, if the steady value is selected as the optimum value, the steady value will be reached slowly.

そこで本願発明者らは、上記従来技術の問題点に鑑みて
、スコロトロン帯電器のグリッドを2つ以上に区分する
とともに少なくとも1つの区分の電位の高低を選択切り
替えできるようにすることにより、像形成体が帯電器の
下へ進入したときに、その電位が速やかに立ち上がり且
つ最適値を維持できる帯電手段を発明し、本願出願人に
おいて特許出願中である。
In view of the above-mentioned problems of the prior art, the inventors of the present application divided the grid of the scorotron charger into two or more sections, and made it possible to selectively switch between high and low potentials in at least one section, thereby forming an image. The present applicant has invented a charging means that allows the potential to quickly rise and maintain an optimal value when a body enters the charger, and the applicant is currently applying for a patent.

その実施例は第2図のとおりである。1はスコロトロン
帯電器、7は高圧電源、8および8′はグリッドであり
電気的に区分されている。従って相互に異なった電位に
保持することができる。
An example thereof is shown in FIG. 1 is a scorotron charger, 7 is a high-voltage power source, and 8 and 8' are grids, which are electrically separated. Therefore, they can be held at mutually different potentials.

4〜6はツェナーダイオードであり、ツェナーダイオー
ドがグリッドに接続されるとグリッドの電位はそのツェ
ナーダイオードのツェナー電圧に維持される。本実施例
ではグリッドが2つの領域に区分されている例であり、
そのうちのグリッド8′にはツェナーダイオード6が接
続され一定の電位が維持されるようになっており、他方
のグリッド8はリレー3の親接点aに接続されており、
リレー3のオンオフ動作により親接点aが子接点す又は
同Cに接続され、子接点すにはツェナーダイオード4が
接続されており、子接点Cにはツェナーダイオード5が
接続されている。
4 to 6 are Zener diodes, and when the Zener diodes are connected to the grid, the potential of the grid is maintained at the Zener voltage of the Zener diodes. In this example, the grid is divided into two areas,
A Zener diode 6 is connected to one of the grids 8' to maintain a constant potential, and the other grid 8 is connected to the parent contact a of the relay 3.
The on/off operation of the relay 3 connects the parent contact a to the child contact A or C, the Zener diode 4 is connected to the child contact A, and the Zener diode 5 is connected to the child contact C.

従って、前記2つのツェナーダイオードのツェナー電圧
を異ならせておくことにより、グリッド8の電位を選択
することができる。リレー3は制御部2からのリレー駆
動信号によりオンオフ動作を行う0.制御部2は電位制
御信号が入力されこれによりリレー駆動信号を出力する
Therefore, by making the Zener voltages of the two Zener diodes different, the potential of the grid 8 can be selected. The relay 3 has a 0.0. The control section 2 receives a potential control signal and outputs a relay drive signal accordingly.

第3図はグリッド8の電位を第1色目の帯電のときは一
900■とし、第2色目から第4色目までは一600■
に切り替え、グリッド8′は切り替え無しで一600V
とした場合の像形成体の電位を2重丸で示した図である
。比較対照のためグリッド8およびグリッド8′を共に
一600Vに固定した場合(白丸のデータ)とグリッド
8およびグリッド8′を共に第1色目の帯電時は一70
0Vで第2色目以降は一600Vに切り替えた場合(黒
丸のデータ)を示しである。
In Figure 3, the potential of the grid 8 is set to 1900■ when charging the first color, and 1600■ for the second to fourth colors.
and grid 8' is -600V without switching.
FIG. 3 is a diagram showing the potential of the image forming body with double circles in the case of the following. For comparison, when grid 8 and grid 8' are both fixed at -600V (white circle data), and when both grid 8 and grid 8' are charged for the first color, it is -70V.
The figure shows the case where the voltage is 0V and the second and subsequent colors are switched to -600V (data with black circles).

図を見ると、共に一600■で切り替え無しの場合は、
第1色目のときと第4色目のときとて約80■の差があ
るのに対し、2重丸で示されたデータには殆ど差がない
、またグリッド8通過位置における電位も黒丸で示され
たデータより約100■高いことがわかる。
Looking at the diagram, if both are 1600■ and there is no switching,
While there is a difference of about 80 square meters between the first color and the fourth color, there is almost no difference in the data indicated by the double circles, and the potential at the grid 8 passing position is also indicated by the black circle. It can be seen that this is approximately 100 ■ higher than the data obtained.

このように、スコロトロン帯電器のグリッドを複数に区
分して、電位を切り替え選択できるようにすることによ
り、像形成体の電位を速やかに立ち上がらせその結果像
形成体上の微細な凹凸や傷の存在或いは紙粉や塵埃の付
着に起因する電位のむらが帯電器の下を通過する間に平
滑化され易くきめの細かい電位制御が行われ、また、第
1色目の電位と第4色目の電位との差も小さくすること
ができその結果地かぶりの少ないカラー画像が形成され
る。
In this way, by dividing the grid of the scorotron charger into a plurality of sections and making it possible to switch and select the potential, the potential of the image forming body can be quickly raised, and as a result, minute irregularities and scratches on the image forming body can be eliminated. The potential unevenness caused by the presence or adhesion of paper powder or dust is easily smoothed out while passing under the charger, and fine potential control is performed. As a result, a color image with less background fog can be formed.

(発明が解決しようとする課題) しかしながら、上記の技術では、高品質の画像形成が行
われる一方でスコロトロングリッドの電位を切り替える
際に高圧電源から過大な放電電流が流れ、この過大電流
或いはその誘導が原因となり複写装置の他の部分の誤動
作を招くという問題を生じた。
(Problem to be Solved by the Invention) However, with the above technology, while high-quality image formation is performed, an excessive discharge current flows from the high voltage power supply when switching the potential of the scorotron grid, and this excessive current or its A problem arises in that the induction causes malfunctions in other parts of the copying apparatus.

本発明の目的は、上記問題点に鑑みて、誤動作の原因と
なっている過大電流の発生を防止する手段を設け、以て
安定且つ高画質の画像形成が行われる画像形成装置を提
供することにある。
SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an image forming apparatus that is provided with means for preventing the generation of excessive current that causes malfunctions, and thereby performs stable and high-quality image formation. It is in.

(課題を解決するための手段) 本発明は、上記の目的を達成するために次の手段構成を
有する。
(Means for Solving the Problems) The present invention has the following means configuration to achieve the above object.

即ち、本発明の画像形成装置は、像形成体に一様帯電を
施し、画像信号に基づく像露光を行って潜像を形成し該
潜像を所定のトナーによって現像した後形成されたトナ
ー像を転写材へ転写して定着し画像形成を行う過程でス
コロトロン帯電器のグリッド電位の切り替えを行う画像
形成装置において、グリッド電位の切り替え時に帯電器
のコロナ放電用高電圧をオフにする手段を有することを
特徴とするものである。
That is, the image forming apparatus of the present invention uniformly charges an image forming body, performs image exposure based on an image signal to form a latent image, and develops the latent image with a predetermined toner, and then forms a toner image. In an image forming apparatus that switches the grid potential of a scorotron charger during the process of transferring and fixing onto a transfer material and forming an image, the image forming apparatus has means for turning off a high voltage for corona discharge of the charger when switching the grid potential. It is characterized by this.

(作 用) 以下、本発明の画像形成装置の作用を説明する。(for production) The operation of the image forming apparatus of the present invention will be explained below.

本発明の画像形成装置においては、スコロトロン帯電器
のグリッド電位の切り替えを行うときに帯電器のコロナ
放電用高電圧をオフにする手段を設けているので、グリ
ッド電位切り替え時には帯電器の放電ワイヤに高電圧が
かかっていないので放電電流が流れないことになる。
In the image forming apparatus of the present invention, a means is provided for turning off the high voltage for corona discharge of the charger when switching the grid potential of the scorotron charger, so that the discharge wire of the charger is turned off when switching the grid potential of the charger. Since no high voltage is applied, no discharge current will flow.

(実 施 例) 以下、本発明の実施例を図面に基づいて説明する。(Example) Embodiments of the present invention will be described below based on the drawings.

第1図は本発明の実施例の構成を示す図である。FIG. 1 is a diagram showing the configuration of an embodiment of the present invention.

第2図の構成と殆ど同じであるが異なる点は制御部2か
ら高圧電源7へ放電ワイヤへの高電圧印加をオンオフす
るオンオフ信号が供給されている点である。
The configuration is almost the same as that in FIG. 2, but the difference is that an on/off signal for turning on/off the application of high voltage to the discharge wire is supplied from the control section 2 to the high voltage power source 7.

オンオフ信号はリレー3へのリレー駆動信号の出力と連
動して出力される。即ち、リレー3の親接点aが子接点
すから離れる直前に放電ワイヤ9への高電圧をオフにし
、親接点aが子接点Cに接してから高電圧をオンにする
ようにオンオフ信号が出力される。従って、親接点aが
子接点すから離れ子接点Cに接するまでの間の浮動状態
にあるときには放電ワイヤに高電圧がかかつていないの
で、過大な放電電流が流れない。
The on/off signal is output in conjunction with the output of the relay drive signal to the relay 3. That is, an on/off signal is output so that the high voltage to the discharge wire 9 is turned off immediately before the master contact a of the relay 3 leaves the slave contact, and the high voltage is turned on after the master contact a contacts the slave contact C. be done. Therefore, when the parent contact a is in a floating state from the time when it comes into contact with the child contact C to the time when it comes into contact with the detached child contact C, no high voltage is applied to the discharge wire, so that no excessive discharge current flows.

従って、過大な放電電流による複写装置内の誤動作の発
生も生じなくなる。
Therefore, malfunctions within the copying apparatus due to excessive discharge current will not occur.

(発明の効果) 以上説明したように、本発明の画像形成装置ではスコロ
トロン帯電器のグリッド電位の切り替え時に帯電器の放
電ワイヤに印加する高電圧をオフにするようにしたので
、切り替え時に過大な放電電流が流れることなく、過大
な放電電流に起因していた複写装置内の他の部分の誤動
作が生起しなくなるという利点がある。
(Effects of the Invention) As explained above, in the image forming apparatus of the present invention, the high voltage applied to the discharge wire of the scorotron charger is turned off when switching the grid potential of the scorotron charger. There is an advantage that no discharge current flows, and malfunctions in other parts of the copying apparatus that would otherwise be caused by an excessive discharge current will not occur.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の実施例の構成を示すブロック図、第2
図はスコロトロン帯電器の区分されたグリッドの1区分
の電位が2段階の電位に切り替えられるようになってい
る構成の図、第3図は第2図の例における像形成体の電
位特性図である。 1・・・・・・スコロトロン帯電器、 2・・・・・・
制御部、3・・・・・・リレー、 4,5.6・・・・
・・ツェナーダイオード、 7・・・・・・高圧電源、
 8,8′・・・・・・グリッド、 9・・・・・・放
電ワイヤ。 代理人 弁理士  八 幡  義 博 第 / 図 第 2 閃
FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIG.
The figure shows a configuration in which the potential of one division of the divided grid of the scorotron charger can be switched to two levels of potential, and Figure 3 is a diagram of the potential characteristics of the image forming body in the example of Figure 2. be. 1...Scorotron charger, 2...
Control unit, 3...Relay, 4,5.6...
...Zener diode, 7...High voltage power supply,
8, 8'...Grid, 9...Discharge wire. Agent: Patent Attorney Yoshihiro Yawata / Figure 2: Sen

Claims (1)

【特許請求の範囲】[Claims]  像形成体に一様帯電を施し、画像信号に基づく像露光
を行って潜像を形成し該潜像を所定のトナーによって現
像した後形成されたトナー像を転写材へ転写して定着し
画像形成を行う過程でスコロトロン帯電器のグリッド電
位の切り替えを行う画像形成装置において、グリッド電
位の切り替え時に帯電器のコロナ放電用高電圧をオフに
する手段を有することを特徴とする画像形成装置。
The image forming body is uniformly charged, image exposure is performed based on an image signal to form a latent image, the latent image is developed with a predetermined toner, and the formed toner image is transferred to a transfer material and fixed to form an image. An image forming apparatus that switches a grid potential of a scorotron charger during a forming process, the image forming apparatus comprising means for turning off a high voltage for corona discharge of the charger when switching the grid potential.
JP459588A 1988-01-12 1988-01-12 Image forming device Pending JPH01180575A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP459588A JPH01180575A (en) 1988-01-12 1988-01-12 Image forming device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP459588A JPH01180575A (en) 1988-01-12 1988-01-12 Image forming device

Publications (1)

Publication Number Publication Date
JPH01180575A true JPH01180575A (en) 1989-07-18

Family

ID=11588396

Family Applications (1)

Application Number Title Priority Date Filing Date
JP459588A Pending JPH01180575A (en) 1988-01-12 1988-01-12 Image forming device

Country Status (1)

Country Link
JP (1) JPH01180575A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3483220A1 (en) 2013-09-30 2019-05-15 Hoya Lens Thailand Ltd. Transparent plastic substrate and plastic lens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3483220A1 (en) 2013-09-30 2019-05-15 Hoya Lens Thailand Ltd. Transparent plastic substrate and plastic lens

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