JPH0527858B2 - - Google Patents
Info
- Publication number
- JPH0527858B2 JPH0527858B2 JP58134167A JP13416783A JPH0527858B2 JP H0527858 B2 JPH0527858 B2 JP H0527858B2 JP 58134167 A JP58134167 A JP 58134167A JP 13416783 A JP13416783 A JP 13416783A JP H0527858 B2 JPH0527858 B2 JP H0527858B2
- Authority
- JP
- Japan
- Prior art keywords
- charger
- current
- chargers
- constant
- shield
- 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
- 238000001514 detection method Methods 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 description 3
- 238000009499 grossing Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 108091008695 photoreceptors Proteins 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
- G03G15/0266—Arrangements for controlling the amount of charge
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Physics & Mathematics (AREA)
- Control Or Security For Electrophotography (AREA)
Description
【発明の詳細な説明】
本発明は、帯電を利用する画像形成装置、例え
ば電子写真複写機における複数の帯電器への給電
方式に関するもので、特に帯電電流の定電流化を
図つた給電装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for feeding power to a plurality of chargers in an image forming apparatus that utilizes charging, such as an electrophotographic copying machine, and particularly relates to a power feeding device that maintains a constant charging current. .
例えば電子写真複写機においては、感光体を帯
電させるための帯電器及び現像像を転写するため
の転写帯電器、さらには残留電荷除電用の帯電器
の如く複数の帯電器が用いられている。 For example, in an electrophotographic copying machine, a plurality of chargers are used, such as a charger for charging a photoreceptor, a transfer charger for transferring a developed image, and a charger for removing residual charges.
従来帯電電流の定電流化のために種々の給電方
式が試みられている。各帯電器に対して個々に高
圧トランスを設ける一般的な給電方式の他に、一
個の高圧トランスに複数の高圧二次巻線を設け、
その各出力を整流後に各帯電器に給電し、そのう
ち所定の帯電器の負荷電流を検出して該高圧トラ
ンスの一次側の印加電力を制御する給電方式も既
に実用化されている。しかし前者は各帯電器毎に
高圧トランス及びその周辺回路が必要なこと、後
者も複数の二次巻線及び整流回路が必要であるこ
と等から、一巻線から複数帯電器に給電する従来
の定電圧給電方式に比して、装置の大型化、コス
ト上昇を招いていた。 Conventionally, various power supply systems have been attempted to make the charging current constant. In addition to the general power supply system in which a high-voltage transformer is installed for each charger, multiple high-voltage secondary windings are installed in one high-voltage transformer.
A power supply system has already been put into practical use in which each output is rectified and then supplied to each charger, and the load current of a predetermined charger is detected to control the power applied to the primary side of the high-voltage transformer. However, the former requires a high-voltage transformer and its peripheral circuits for each charger, and the latter also requires multiple secondary windings and rectifier circuits. Compared to the constant voltage power supply method, this led to larger equipment and higher costs.
本発明は、上述の欠点を除去して、装置のコス
ト上昇、大型化を招く事なく、複数の帯電器のう
ち所定の帯電器の帯電電流を定電流化することを
意図したものである。 The present invention is intended to eliminate the above-mentioned drawbacks and to make the charging current of a predetermined charger among a plurality of chargers a constant current without causing an increase in cost or size of the device.
本発明による帯電器の給電装置は、ワイヤとシ
ールドとを備え互いに並列に接続された複数の帯
電器へ高圧電力を供給するために共通の１つの二
次巻線を備えた高圧トランスと、前記複数の帯電
器のうち一部の帯電器のシールド電流を検知する
検知手段と、この検知結果に基づいて前記シール
ド電流が一定になるように前記トランスの一次側
を制御する制御手段とを有することを特徴とす
る。帯電器の帯電電流はシールド電流と一定の比
率にあるという性質があるから、上記のようにす
ることにより、その帯電器の帯電電流は定電流化
されることになる。 A power supply device for a charger according to the present invention includes a high-voltage transformer including a wire and a shield and a common secondary winding for supplying high-voltage power to a plurality of chargers connected in parallel; It has a detection means for detecting the shield current of some of the chargers among the plurality of chargers, and a control means for controlling the primary side of the transformer so that the shield current is constant based on the detection result. It is characterized by Since the charging current of the charger has a property that it is in a constant ratio with the shield current, by doing the above, the charging current of the charger is made constant.
以下、本発明の実施例を説明する。 Examples of the present invention will be described below.
第１図は電子写真複写機の場合の実施例を示
し、１は矢印方向に回転する感光ドラムでアルミ
の導体ベース上に感光層を有する構造からなり、
アルミの導体ベースは回転軸を介して框体に接地
されている。２は感光ドラム帯電用の帯電器で感
光ドラム表面に負電荷を荷電する。３は原稿から
の反射光で、感光ドラム上にこの反射光の当つた
部分の抵抗値が下つて負電荷を放電し、感光ドラ
ム上に潜像が形成される。４は現像器で正電荷を
有するトナー粒子を感光ドラムに近接させ、感光
ドラム上の負電荷の残存する部分、即ち原稿の暗
部に相当する部分にトナーを付着させトナー像を
形成する。５は転写帯電器で転写紙６に感光ドラ
ム上のトナー像を吸引付着させる。 FIG. 1 shows an example of an electrophotographic copying machine, in which 1 is a photosensitive drum that rotates in the direction of the arrow, and has a structure having a photosensitive layer on an aluminum conductor base.
The aluminum conductor base is grounded to the frame via the rotating shaft. Reference numeral 2 denotes a charger for charging the photosensitive drum, which charges the surface of the photosensitive drum with a negative charge. Reference numeral 3 indicates reflected light from the original document, and the resistance value of the portion of the photosensitive drum that is hit by this reflected light decreases, thereby discharging negative charges and forming a latent image on the photosensitive drum. A developing device 4 brings positively charged toner particles close to the photosensitive drum, and causes the toner to adhere to the portions of the photosensitive drum where the negative charges remain, that is, the portions corresponding to the dark portions of the document, thereby forming a toner image. Reference numeral 5 denotes a transfer charger which attracts and attaches the toner image on the photosensitive drum to the transfer paper 6.
帯電器２，５はワイヤとシールドとを備え互い
に並列に接続され、図のように框体から絶縁さ
れ、これら帯電器のシールドはそれぞれ電流検出
用抵抗器R1，R2によつて框体に接地される。抵
抗器R1によつて検出された帯電器２の負荷電流
は誤差増幅器９によつて基準値と比較されてイン
バータ駆動回路８に入力されてインバータトラン
ス７の一次側印加電力を制御する。帯電器２，５
はトランス７の共通の二次巻線から、整流ダイオ
ードD1、ブリーダ抵抗R3、平滑コンデンサC1な
る回路及び火花防止用抵抗器R4，R5を介して
夫々給電される。 The chargers 2 and 5 have wires and shields, and are connected in parallel to each other, and are insulated from the frame as shown in the figure.The shields of these chargers are connected to the frame by current detection resistors R 1 and R 2 , respectively. grounded. The load current of the charger 2 detected by the resistor R 1 is compared with a reference value by the error amplifier 9 and input to the inverter drive circuit 8 to control the power applied to the primary side of the inverter transformer 7 . Charger 2, 5
are respectively supplied from a common secondary winding of the transformer 7 via a circuit consisting of a rectifier diode D 1 , a bleeder resistor R 3 , a smoothing capacitor C 1 , and spark prevention resistors R 4 and R 5 .
高圧出力から帯電器へ流れる負荷電流は、各帯
電器の帯電線から概略３：１という一定の比率で
その帯電器シールドと感光ドラム１に分配され
る。帯電器２による感光ドラムの帯電及び転写帯
電器５による転写帯電に本質的に寄与するのはそ
れら帯電器の帯電線から感光ドラムに流れる帯電
電流であるが、上記の如くこの帯電電流はその帯
電器の帯電線から帯電器シールドに流れる電流と
一定の比率にあるから、帯電器２のシールドに流
れる電流を前記の如く抵抗器R1で検知して前記
の如き制御を行うことにより、環境変化に伴うそ
の帯電器インピーダンスの変動を十分に補正して
帯電器２の帯電電流を一定値に保つことができる
のである。この場合、転写帯電器５については定
電流化制御がなされないが、これは帯電器２の定
電流化の方をより重視したためである。 The load current flowing from the high voltage output to the charger is distributed from the charging wire of each charger to the charger shield and the photosensitive drum 1 at a constant ratio of approximately 3:1. What essentially contributes to the charging of the photosensitive drum by the charger 2 and the transfer charging by the transfer charger 5 is the charging current flowing from the charging wires of these chargers to the photosensitive drum, but as described above, this charging current Since the current flowing from the charging wire of the charger to the shield of the charger is at a constant ratio, by detecting the current flowing to the shield of the charger 2 with the resistor R1 as described above and performing the control as described above, it is possible to prevent changes in the environment. The charging current of the charger 2 can be maintained at a constant value by sufficiently correcting the fluctuation in the charger impedance caused by the change in charger impedance. In this case, the transfer charger 5 is not controlled to have a constant current, but this is because more emphasis is placed on making the charger 2 constant current.
前記実施例では、抵抗器R1によつて帯電器２
のシールド電流を検知して帯電器２の帯電電流を
定電流化したが、これに代つて抵抗器R2により
転写帯電器５のシールド電流を検知することによ
り、前記と同様にして帯電器５の帯電電流すなわ
ち転写電流を定電流化することも可能である。 In the above embodiment, the charger 2 is connected to the charger 2 by the resistor R1.
The charging current of the charger 2 was made constant by detecting the shield current of the transfer charger 5, but instead of this, by detecting the shield current of the transfer charger 5 with the resistor R2 , the charger 5 was changed in the same manner as described above. It is also possible to make the charging current, that is, the transfer current, a constant current.
第１図の実施例は同極性の帯電器２，５の場合
であるが、それらが異性極の帯電器である場合は
第２図の様に逆向きの整流ダイオードD2、ブリ
ーダ抵抗R6、平滑コンデンサC2なる整流回路を
追加することで、帯電器２の帯電電流を定電流化
することが可能である。この場合も、帯電器２の
代りに、上述と同様に、転写帯電器５を定電流化
することもできる。第２図の実施例は、光３が原
稿反射光でなくレーザー光でバツクスキヤン（背
景走査）され、負電荷を有するトナーにより現像
するレーザービームプリンター等に対する実施例
である。 The embodiment shown in FIG. 1 is for chargers 2 and 5 of the same polarity, but if they are chargers of opposite polarity, the rectifier diode D 2 and bleeder resistor R 6 are connected in opposite directions as shown in FIG. By adding a rectifier circuit such as a smoothing capacitor C2 , it is possible to make the charging current of the charger 2 a constant current. Also in this case, instead of the charger 2, the transfer charger 5 can be made to have a constant current as described above. The embodiment shown in FIG. 2 is an embodiment for a laser beam printer or the like in which the light 3 is back-scanned by a laser beam instead of the original reflected light, and the image is developed by toner having a negative charge.
以上説明したように、本発明によれば、先に述
べた従来の定電流化給電方式に比べて部品数の少
い簡単な回路構成を用いて、所望の帯電器の負荷
電流を定電流に制御しつつ複数の帯電器に給電す
ることができ、装置の大型化やコスト上昇が避け
られる。 As explained above, according to the present invention, the load current of the desired charger can be adjusted to a constant current using a simple circuit configuration with fewer parts than the conventional constant current power supply method described above. It is possible to supply power to multiple chargers while controlling it, thereby avoiding an increase in the size and cost of the device.
第１図は本発明の一実施例の回路構成、第２図
は、レーザービームプリンタへの応用例であつ
て、転写帯電器に正の高圧を給電する場合の本発
明の実施例を示す回路構成図である。
１…感光ドラム、２…感光体帯電器、３…原稿
反射光、４…現像器、５…転写帯電器、６…転写
紙、７…インバータトランス、８…インバータ駆
動回路、９…誤差増幅器、D1，D2…整流ダイオ
ード、R1，R2…電流検出用抵抗器、R3…ブリー
ダ抵抗、R4，R5…火花防止用抵抗器、C1，C2…
平滑コンデンサ。
FIG. 1 shows a circuit configuration of an embodiment of the present invention, and FIG. 2 shows a circuit diagram of an embodiment of the present invention applied to a laser beam printer, in which a positive high voltage is supplied to a transfer charger. FIG. DESCRIPTION OF SYMBOLS 1... Photosensitive drum, 2... Photosensitive charger, 3... Original reflected light, 4... Developer, 5... Transfer charger, 6... Transfer paper, 7... Inverter transformer, 8... Inverter drive circuit, 9... Error amplifier, D 1 , D 2 ... Rectifier diode, R 1 , R 2 ... Current detection resistor, R 3 ... Bleeder resistance, R 4 , R 5 ... Spark prevention resistor, C 1 , C 2 ...
smoothing capacitor.
Claims (1)
された複数の帯電器へ高圧電力を供給するために
共通の１つの二次巻線を備えた高圧トランスと、
前記複数の帯電器のうち一部の帯電器のシールド
電流を検知する検知手段と、この検知結果に基づ
いて前記シールド電流が一定になるように前記ト
ランスの一次側を制御する制御手段とを有するこ
とを特徴とする帯電器の給電装置。1. A high-voltage transformer equipped with one common secondary winding for supplying high-voltage power to a plurality of chargers connected in parallel with each other, each having a wire and a shield;
It has a detection means for detecting the shield current of some of the chargers among the plurality of chargers, and a control means for controlling the primary side of the transformer so that the shield current is constant based on the detection result. A power supply device for a charger characterized by the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58134167A JPS6026363A (en) | 1983-07-22 | 1983-07-22 | Power feeding system of electrostatic charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58134167A JPS6026363A (en) | 1983-07-22 | 1983-07-22 | Power feeding system of electrostatic charger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6026363A JPS6026363A (en) | 1985-02-09 |
| JPH0527858B2 true JPH0527858B2 (en) | 1993-04-22 |
Family
ID=15122010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58134167A Granted JPS6026363A (en) | 1983-07-22 | 1983-07-22 | Power feeding system of electrostatic charger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6026363A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07160098A (en) * | 1993-12-10 | 1995-06-23 | Mita Ind Co Ltd | Image forming device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5564262A (en) * | 1978-11-01 | 1980-05-14 | Xerox Corp | Followwup power supply circuit for controlling multiple corotron |
| JPS55122379A (en) * | 1979-03-15 | 1980-09-20 | Matsushita Electric Ind Co Ltd | High voltage power supply for copying machine |
| JPS5621157A (en) * | 1979-07-26 | 1981-02-27 | Sharp Corp | Corona charger |
-
1983
- 1983-07-22 JP JP58134167A patent/JPS6026363A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5564262A (en) * | 1978-11-01 | 1980-05-14 | Xerox Corp | Followwup power supply circuit for controlling multiple corotron |
| JPS55122379A (en) * | 1979-03-15 | 1980-09-20 | Matsushita Electric Ind Co Ltd | High voltage power supply for copying machine |
| JPS5621157A (en) * | 1979-07-26 | 1981-02-27 | Sharp Corp | Corona charger |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6026363A (en) | 1985-02-09 |
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