JP2004301978A - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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Publication number
JP2004301978A
JP2004301978A JP2003093124A JP2003093124A JP2004301978A JP 2004301978 A JP2004301978 A JP 2004301978A JP 2003093124 A JP2003093124 A JP 2003093124A JP 2003093124 A JP2003093124 A JP 2003093124A JP 2004301978 A JP2004301978 A JP 2004301978A
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JP
Japan
Prior art keywords
ozone
image forming
forming apparatus
measuring
filter
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
JP2003093124A
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Japanese (ja)
Inventor
Kenichi Honda
謙一 本田
Kanna Iinuma
環奈 飯沼
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.)
Hitachi Ltd
Hitachi Information Technology Co Ltd
Original Assignee
Hitachi Ltd
Hitachi Information Technology Co Ltd
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
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Priority to JP2003093124A priority Critical patent/JP2004301978A/en
Publication of JP2004301978A publication Critical patent/JP2004301978A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent a print defect by detecting all high-voltage part operation states of an electrophotographic process part of an image forming apparatus or to accurately calculate the life of an ozone filter by measuring ozone density before and behind an ozone filter and calculating the difference. <P>SOLUTION: The image forming apparatus is equipped with a measuring instrument which measures the density of ozone produced through the corona discharge of a high voltage part, and ensures printing by measuring the density of the ozone before, in the middle, and after printing and realizing total abnormality sensing of a high voltage system. Further, the image forming apparatus produces ozone irrelevantly to imaging operation and measuring instrument measures the density before and behind the ozone filter to accurately calculate the life of the ozone filter. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
この発明は、電子写真プロセスを利用したレーザプリンタや複写機などの画像形成装置に係り、特に電子写真プロセスで発生するオゾンの利用技術に関するものである。
【0002】
【従来の技術】
電子写真プロセスを利用した画像形成装置においては、転写や感光体の帯電に高電圧を使用している。高電圧が帯電線に正常に印可しなくなった場合、もしくは印可していても帯電線の汚れ等により正常に放電されなくなった場合、真黒・真白などの印刷不良となっていた。このため、高電圧部電圧を測定し、印刷不良を防止するものがある(例えば、特許文献1を参照)。
【0003】
また、画像形成装置の高電圧によりコロナ放電が行われ、このコロナ放電において、空気の絶縁破壊を行うために、オゾン発生となる。オゾンには種々の特性があるが、人体に対しては上気道摂取率が低いために簡単に呼吸器深部に達し、一定量の暴露で肺水腫、気管支炎、肺気腫などの障害が発生する。このため電子写真プロセスを利用した画像形成装置等では、オゾンフィルタを用いて酸素と二酸化炭素に分解して排気するようにしている(例えば、特許文献2を参照)。
【0004】
【特許文献1】
特開平9−160402号公報
【特許文献2】
特開平8−206453号公報
【0005】
【発明が解決しようとする課題】
しかしながら、前記従来技術では、高電圧センサが高価なためプリンタ装置の価格が上昇してします問題があった。このため、高電圧部の電圧を測定可能な高価なプリンタ装置以外のプリンタでは、印刷結果を人手で確認することで高電圧部の異常を判断するしかないという問題点があった。
【0006】
また、高電圧部の電圧のセンスを行っても、高電圧電源部が正常であれば、仮に帯電線が切れていたり、汚れが付着し正常に帯電されないなどの高電圧部のトータル的な異常はセンスできず、結果的に印刷結果で高電圧系の異常を判断せざるを得なかった。
【0007】
本発明の目的は、電子写真プロセスを利用した画像形成装置においては、電子写真プロセスを実施すると二次的に発生するオゾンに着目して、上記問題点を解決することにある。
【0008】
【課題を解決するための手段】
オゾンの発生メカニズムによれば、オゾンが発生していれば高電圧が正常に印可されていることになり、かつコロナ放電も正常に行われている事が判明する。上記目的を達成するため、本願発明では、電子写真プロセスを実施するために行う高電圧部のコロナ放電により発生したオゾンの濃度を測定するオゾン濃度測定器を設け、このオゾン濃度を測定することにより電子写真プロセスを利用した画像形成装置の電子写真プロセス部の高電圧系状態を判断するようにした。
【0009】
また、本発明は副次的な作用であったオゾンの発生を、トータル的な高電圧系の異常センスとして利用し、電圧センスでは実現困難な、電子写真プロセス部のすべての高電圧部動作保証を実現するものである。
【0010】
さらに、上記高電圧部動作保証用のオゾン測定器に加えて、オゾン分解用のオゾンフィルタ外にもう一つ同一測定部を設け、差分を計測する事によりオゾンフィルタの寿命を正確に算出する。
【0011】
より詳しくは、印刷前、印刷途中、印刷後にオゾンの濃度を測定するプロセスを実施することにより、高電圧系の総合的な異常センスを可能とし印刷の保証を実現するものである。
【0012】
また、この発明に係わる画像形成装置は、作像動作とは関係なくオゾンを発生させ、オゾン濃度測定器によりオゾンフィルタの前後の濃度を測定し測定した結果を表示または、出力可能な制御部を有する。さらに、オゾン濃度測定のタイミングを制御可能な制御部を有する。これにより、オゾンフィルタ通過前後のオゾン濃度測定を可能としオゾンフィルタの寿命を正確に算出し有害なオゾンの排出を未然に防ぐことを実現するものである。
【0013】
【発明の実施の形態】
図1は、この発明の一実施例である。図に示す画像形成装置16中の感光体1を帯電させるコロナ放電器2およびコロナ放電を行う転写器15および現像器3を有する高電圧系オゾン発生部位4において、オゾン発生部位4はその他の画像形成装置と隔絶されており、外気導入口5と排気口6を有する。外気導入口5から導かれた外気は高電圧系にて発生したオゾンを含み、ファン7によりオゾンフィルタ8を通過して排気口6よりオゾンが分解され排出される。
【0014】
また、コロナ放電器2および転写器15の近傍、およびオゾン発生部位4の外側のオゾンフィルタ8近傍にそれぞれ、オゾン濃度測定センサ9、10を設け、オゾン濃度測定のタイミングを制御およびオゾン濃度の正常・異常の判断が可能な制御機能を有した測定制御部11を有する。測定制御部11は測定したオゾン濃度および測定による高電圧部の正常・異常などの状態を分析・判断する。
【0015】
また、測定制御部11は測定したオゾン濃度や分析・判断した高電圧部の正常・異常の結果を表示可能な表示部14を有する。 さらに、作像動作の有無に係わらず高電圧電源部を制御することによりコロナ放電器2および転写器15および現像器3を動作させ、オゾンの発生を制御可能な高電圧電源制御部12および高電圧部13を有する。
【0016】
上記のように構成された画像系背装置において、印刷動作前に、高電圧電源制御部12により高電圧部13を作動させコロナ放電器2および転写器15および現像器3より、発生したオゾンをオゾン濃度測定センサ9により測定する。この測定情報を測定制御部11にて分析・判断し表示部14に表示することにより、印刷実施前の高電圧部の正常・異常を認識することができる。
【0017】
また、印刷動作中および印刷動作後のオゾン濃度をオゾン濃度測定センサ9により測定する。この測定情報を測定制御部11にて分析・判断し表示部14に表示することにより、印刷動作後の高電圧部の正常・異常を認識することができ、総合的な印刷結果の保証を可能とする。
【0018】
また、コロナ放電器2および転写器15および現像器3のコロナ放電で発生したオゾンはファン7により、排気口6に導かれ、排気口6に設けたオゾンフィルタ8を通過し外気中へ放出される。センサ9および10によりオゾンフィルタ通過前後のオゾン濃度を測定し比較分析することにより、オゾンフィルタ通過後のオゾン濃度の低下状態を把握・判断し、表示部14に表示することにより、オゾンフィルタの寿命を的確に把握することを可能とする。
【0019】
なお、上記実施例は測定制御部で判定した結果を表示部に表示したが、この情報を上位装置にインターフェースを使用して伝達することによりもしくは上位装置が読みとりに行くことにより上位装置側から確認するよう制御しても良い。
【0020】
【発明の効果】
本発明は以上説明したように電子写真プロセスで発生したオゾンの濃度を測定する事により総合的な高電圧系の異常センスを行い、また印刷前後のオゾン濃度のセンスを行うことにより印刷結果までを保証できる効果を奏する。
【0021】
また、オゾンフィルター通過後のオゾン濃度を測定することにより、装置設置環境のオゾン濃度が測定でき装置可動時間で管理しているオゾンフィルタの交換時期がオゾンフィルタの能力として確認でき、適正な交換時期を判断できる効果を奏する。
【図面の簡単な説明】
【図1】本発明の実施例の構成を示す図である。
【符号の説明】
感光体、2.コロナ放電器、3.現像器、
4.高電圧系オゾン発生部位、5.外気導入口、6.排気口、
7.ファン、8.オゾンフィルタ、
9,10.オゾン濃度測定センサ、11.測定制御部、
12.高電圧電源制御部、13.高電圧部、14.表示部、
15.転写器、16.画像形成装置
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image forming apparatus such as a laser printer or a copier using an electrophotographic process, and more particularly to a technique for using ozone generated in an electrophotographic process.
[0002]
[Prior art]
2. Description of the Related Art In an image forming apparatus using an electrophotographic process, a high voltage is used for transfer and charging of a photosensitive member. When the high voltage is not normally applied to the charged line, or when the applied voltage is not normally discharged due to contamination of the charged line or the like, printing failure such as black and white is caused. For this reason, there is one that measures a high-voltage portion voltage to prevent printing failure (for example, see Patent Document 1).
[0003]
Further, corona discharge is performed by the high voltage of the image forming apparatus, and in this corona discharge, ozone is generated due to dielectric breakdown of air. Although ozone has various characteristics, it easily reaches the deep respiratory tract due to a low intake rate of the upper respiratory tract to the human body, and a certain amount of exposure causes disorders such as pulmonary edema, bronchitis, and emphysema. For this reason, in an image forming apparatus or the like using an electrophotographic process, an ozone filter is used to decompose into oxygen and carbon dioxide and exhaust the gas (for example, see Patent Document 2).
[0004]
[Patent Document 1]
JP 9-160402 A [Patent Document 2]
JP-A-8-206453
[Problems to be solved by the invention]
However, the conventional technique has a problem in that the price of the printer device increases because the high voltage sensor is expensive. For this reason, in a printer other than an expensive printer device capable of measuring the voltage of the high-voltage section, there is a problem that an abnormality in the high-voltage section must be determined by manually checking the print result.
[0006]
Also, even if the voltage of the high-voltage part is sensed, if the high-voltage power supply part is normal, a total abnormality of the high-voltage part such as a broken charging line or contamination and improper charging will not occur. Could not be sensed, and as a result, it was necessary to judge the abnormality of the high voltage system based on the print result.
[0007]
An object of the present invention is to solve the above-mentioned problems in an image forming apparatus using an electrophotographic process, focusing on ozone that is generated secondarily when the electrophotographic process is performed.
[0008]
[Means for Solving the Problems]
According to the ozone generation mechanism, it is found that if ozone is generated, a high voltage is normally applied, and that corona discharge is also performed normally. In order to achieve the above object, in the present invention, an ozone concentration measuring device for measuring the concentration of ozone generated by corona discharge in a high-voltage section for performing an electrophotographic process is provided, and by measuring this ozone concentration The high voltage state of the electrophotographic process section of the image forming apparatus utilizing the electrophotographic process is determined.
[0009]
Further, the present invention utilizes the generation of ozone, which is a secondary effect, as a total sense of abnormality in a high-voltage system, and guarantees the operation of all high-voltage sections of the electrophotographic process section, which is difficult to achieve with voltage sensing. Is realized.
[0010]
Further, in addition to the ozone measuring device for guaranteeing the operation of the high voltage section, another identical measuring section is provided outside the ozone filter for decomposing ozone, and the difference is measured to accurately calculate the life of the ozone filter.
[0011]
More specifically, by performing a process of measuring the concentration of ozone before printing, during printing, or after printing, comprehensive abnormality sensing of a high-voltage system is enabled and printing is guaranteed.
[0012]
Further, the image forming apparatus according to the present invention includes a control unit that generates ozone irrespective of the image forming operation, measures the concentration before and after the ozone filter with an ozone concentration measuring device, and displays or outputs the measurement result. Have. Further, it has a control unit capable of controlling the timing of the ozone concentration measurement. Thus, it is possible to measure the ozone concentration before and after passing through the ozone filter, accurately calculate the life of the ozone filter, and prevent the emission of harmful ozone.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows an embodiment of the present invention. In a high voltage system ozone generating portion 4 having a corona discharger 2 for charging the photoconductor 1 and a transfer device 15 and a developing device 3 for performing corona discharge in the image forming apparatus 16 shown in FIG. It is isolated from the forming device and has an outside air inlet 5 and an outlet 6. The outside air introduced from the outside air inlet 5 contains ozone generated in a high voltage system, passes through an ozone filter 8 by a fan 7, and is decomposed and discharged from an exhaust port 6 through an exhaust port 6.
[0014]
Further, ozone concentration measurement sensors 9 and 10 are provided near the corona discharger 2 and the transfer device 15 and near the ozone filter 8 outside the ozone generating portion 4, respectively, to control the timing of the ozone concentration measurement and to correct the ozone concentration. -It has the measurement control part 11 which has the control function which can judge abnormality. The measurement control unit 11 analyzes and determines the measured ozone concentration and the normal / abnormal state of the high voltage unit based on the measurement.
[0015]
Further, the measurement control unit 11 has a display unit 14 capable of displaying the measured ozone concentration and the result of normality / abnormality of the high voltage part analyzed / determined. Further, the corona discharger 2, the transfer device 15, and the developing device 3 are operated by controlling the high-voltage power supply unit regardless of the presence or absence of the image forming operation, and the high-voltage power supply control unit 12 capable of controlling the generation of ozone is provided. It has a voltage section 13.
[0016]
In the image system configured as described above, before the printing operation, the high-voltage power supply control unit 12 activates the high-voltage unit 13 to cause the corona discharger 2, the transfer device 15, and the developing device 3 to generate the ozone. It is measured by the ozone concentration measurement sensor 9. By analyzing and determining this measurement information in the measurement control unit 11 and displaying it on the display unit 14, it is possible to recognize whether the high-voltage unit is normal or abnormal before printing.
[0017]
The ozone concentration during and after the printing operation is measured by the ozone concentration measuring sensor 9. This measurement information is analyzed and judged by the measurement control unit 11 and displayed on the display unit 14, so that it is possible to recognize the normal / abnormal of the high-voltage part after the printing operation, and to guarantee the overall printing result. And
[0018]
The ozone generated by the corona discharge of the corona discharger 2, the transfer unit 15, and the developing unit 3 is guided to the exhaust port 6 by the fan 7, passes through the ozone filter 8 provided in the exhaust port 6, and is released into the outside air. You. By measuring and comparing and analyzing the ozone concentration before and after passing through the ozone filter by the sensors 9 and 10, the state of decrease in the ozone concentration after passing through the ozone filter is grasped and judged, and displayed on the display unit 14, whereby the life of the ozone filter is reduced. Can be accurately grasped.
[0019]
In the above embodiment, the result determined by the measurement control unit is displayed on the display unit. However, the information is transmitted from the higher-level device to the higher-level device by using an interface or is read from the higher-level device by the higher-level device. Control may be performed.
[0020]
【The invention's effect】
The present invention measures the concentration of ozone generated in the electrophotographic process as described above to perform comprehensive sense of abnormalities in the high voltage system, and also performs the sensing of the ozone concentration before and after printing to determine the printing result. It has an effect that can be guaranteed.
[0021]
In addition, by measuring the ozone concentration after passing through the ozone filter, the ozone concentration in the installation environment of the device can be measured, and the replacement time of the ozone filter, which is controlled by the operation time of the device, can be confirmed as the capability of the ozone filter. The effect that can judge is produced.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.
[Explanation of symbols]
1. photoreceptor, Corona discharger, 3. Developing unit,
4. 4. High-voltage ozone generation site; 5. outside air inlet; exhaust port,
7. Fan, 8. Ozone filter,
9,10. 10. Ozone concentration measurement sensor, Measurement control unit,
12. 12. high-voltage power supply control unit; 13. high voltage section; Display,
15. Transfer device, 16. Image forming device

Claims (2)

電子写真プロセスを利用した画像形成装置において、電子写真プロセスを実施する過程で発生するオゾンを印刷実行前あるいは印刷中に測定するオゾン測定器を備えたことを特徴とする画像形成装置。An image forming apparatus using an electrophotographic process, comprising an ozone measuring device for measuring ozone generated during the process of performing the electrophotographic process before or during printing. 電子写真プロセスを利用した画像形成装置において、オゾンフィルターの空気流路の前後にオゾンを測定するオゾン測定器を備え、電子写真プロセスの一部の機能を動作させオゾンを発生させ、前記オゾン測定器の測定値からオゾンフィルターの寿命を判定することを特徴とする画像形成装置。In an image forming apparatus using an electrophotographic process, an ozone measuring device for measuring ozone before and after an air flow path of an ozone filter is provided, and a part of the function of the electrophotographic process is operated to generate ozone. An image forming apparatus for determining a life of an ozone filter from a measured value of the ozone filter.
JP2003093124A 2003-03-31 2003-03-31 Image forming apparatus Pending JP2004301978A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012029335A1 (en) 2010-08-31 2012-03-08 大日本スクリーン製造株式会社 Liquid supply device and method of determining the replacement time of a gas adjustment element
CN110196544A (en) * 2019-07-04 2019-09-03 海南海建鑫网智能科技股份有限公司 A kind of multi-function printer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012029335A1 (en) 2010-08-31 2012-03-08 大日本スクリーン製造株式会社 Liquid supply device and method of determining the replacement time of a gas adjustment element
US9039149B2 (en) 2010-08-31 2015-05-26 SCREEN Holdings Co., Ltd. Liquid feeding device and method of determining time of exchange of gas control element
CN110196544A (en) * 2019-07-04 2019-09-03 海南海建鑫网智能科技股份有限公司 A kind of multi-function printer

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