JPH09305035A - Wet type electrophotographic device - Google Patents
Wet type electrophotographic deviceInfo
- Publication number
- JPH09305035A JPH09305035A JP12154596A JP12154596A JPH09305035A JP H09305035 A JPH09305035 A JP H09305035A JP 12154596 A JP12154596 A JP 12154596A JP 12154596 A JP12154596 A JP 12154596A JP H09305035 A JPH09305035 A JP H09305035A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- electrophotographic apparatus
- toner image
- wet electrophotographic
- photoconductor
- 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.)
- Granted
Links
Landscapes
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
- Developing For Electrophotography (AREA)
- Wet Developing In Electrophotography (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は複写機、プリンタ、
ファクシミリ等の湿式電子写真装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying machine, a printer,
The present invention relates to a wet electrophotographic apparatus such as a facsimile.
【０００２】[0002]
【従来の技術】複写機、プリンタ、ファクシミリ等の湿
式電子写真装置においては、感光体ドラム、感光体ベル
ト等からなる感光体を駆動源により移動させ、この感光
体上にトナー像形成手段によりトナー像を形成し、この
感光体上のトナー像を転写手段にて記録紙などの転写体
へ転写させている。トナー像形成手段は、感光体を帯電
手段により一様に帯電して露光手段にて露光することに
より、感光体上に静電潜像を形成し、この感光体上の静
電潜像を湿式現像装置で現像してトナー像としている。2. Description of the Related Art In a wet electrophotographic apparatus such as a copying machine, a printer and a facsimile, a photosensitive member including a photosensitive drum and a photosensitive belt is moved by a drive source, and toner is formed on the photosensitive member by toner image forming means. An image is formed, and the toner image on the photoconductor is transferred to a transfer body such as recording paper by a transfer unit. The toner image forming unit forms an electrostatic latent image on the photosensitive member by uniformly charging the photosensitive member with the charging unit and exposing the photosensitive member with the exposing unit, and wets the electrostatic latent image on the photosensitive member. The toner image is developed by the developing device.
【０００３】このような湿式電子写真装置において、感
光体上のトナー像に対してトナー像電荷付与装置として
のセット手段にて放電により電荷を付与してトナー像を
安定化するようにしたものが提案されている。このセッ
ト手段は、感光体との間に空隙を設けて配置された導電
性部材により構成されて電源から放電開始電圧以上の直
流電圧が印加され、この導電性部材と感光体との間で放
電を行って感光体上のトナー像に電荷を付与している。
これにより、感光体上のトナー像はセット手段による電
荷の付与でトナー同士及び感光体との間の結合力が増し
て安定化するというセット効果が得られる。In such a wet-type electrophotographic apparatus, a toner image on a photoconductor is stabilized by applying a charge to the toner image by a setting means as a toner image charge applying device to stabilize the toner image. Proposed. The setting means is composed of a conductive member disposed with a gap between the photosensitive member and a photoconductor, and a DC voltage higher than the discharge start voltage is applied from a power source to discharge between the conductive member and the photoconductor. Then, the toner image on the photoconductor is charged.
As a result, the toner image on the photoconductor is stabilized by the increase in the binding force between the toners and the photoconductor due to the charge applied by the setting means.
【０００４】[0004]
【発明が解決しようとする課題】上記セット手段を有す
る湿式電子写真装置では、セット手段は、感光体との間
に空隙を設けて配置された導電性部材により構成されて
電源から放電開始電圧以上の直流電圧が印加され、この
導電性部材から感光体に放電を行って感光体上のトナー
像に電荷を付与するので、導電性部材と感光体との間の
放電は一方向のみで起こり、トナーの単位質量当たりの
電荷量（Ｑ／ｍ）が上昇してトナーと感光体との結合力
が増加することによって転写手段による転写工程での必
要転写電流が上昇する。本発明は、上記問題点を解決
し、必要転写電流を下げることができる湿式電子写真装
置を提供することを目的とする。In the wet electrophotographic apparatus having the above-mentioned setting means, the setting means is composed of a conductive member which is arranged with a gap between the photosensitive member and the photoconductor, and the discharge starting voltage from the power source is higher than the discharge starting voltage. DC voltage is applied, and the conductive member discharges the photoconductor to give a charge to the toner image on the photoconductor, so that the discharge between the conductive member and the photoconductor occurs in only one direction. The charge amount (Q / m) per unit mass of the toner is increased and the binding force between the toner and the photoconductor is increased, so that the transfer current required in the transfer step by the transfer means is increased. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a wet electrophotographic apparatus capable of reducing the required transfer current.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するた
め、請求項１に係る発明は、感光体上にトナー像を形成
するトナー像形成手段と、このトナー像形成手段により
前記感光体上に形成されたトナー像に放電により電荷を
付与して該トナー像を安定化するセット手段と、このセ
ット手段により電荷が付与された前記感光体上のトナー
像を転写体へ転写させる転写手段とを有する湿式電子写
真装置において、前記セット手段を前記感光体に非接触
な導電性部材から構成し、この導電性部材と前記感光体
上のトナー像との間の放電開始電圧の２倍以上のピーク
間電圧を有する交流電圧を前記導電性部材に印加する電
圧印加手段を備えたものであり、必要転写電流を下げる
ことができる。In order to achieve the above object, the invention according to claim 1 is a toner image forming means for forming a toner image on a photoconductor, and the toner image forming means forms a toner image on the photoconductor. A set means for stabilizing the toner image by applying an electric charge to the formed toner image by electric discharge, and a transfer means for transferring the toner image on the photoconductor to which a charge is applied by the setting means to a transfer body. In the wet electrophotographic apparatus having the above, the setting means is composed of a conductive member that is not in contact with the photoconductor, and the peak of the discharge start voltage between the conductive member and the toner image on the photoconductor is twice or more. It is provided with a voltage applying means for applying an AC voltage having an inter-voltage to the conductive member, and can reduce the required transfer current.
【０００６】請求項２に係る発明は、請求項１記載の湿
式電子写真装置において、前記電圧印加手段は前記導電
性部材に前記交流電圧と直流電圧とを重畳して印加する
ものであり、直流電圧により必要転写電流を操作するこ
とができる。According to a second aspect of the present invention, in the wet electrophotographic apparatus according to the first aspect, the voltage applying means applies the AC voltage and the DC voltage to the conductive member in a superimposed manner. The required transfer current can be manipulated by the voltage.
【０００７】請求項３に係る発明は、請求項１または２
記載の湿式電子写真装置において、前記感光体に対して
前記セット手段と前記転写手段との間で光を照射して電
荷を減衰させる感光体電荷減衰用光源を設けたものであ
り、必要転写電流を下げることができる。[0007] The invention according to claim 3 is the invention according to claim 1 or 2.
In the wet electrophotographic apparatus described above, a photoconductor charge attenuating light source for irradiating light to the photoconductor between the setting means and the transfer means is provided, and a necessary transfer current is provided. Can be lowered.
【０００８】請求項４に係る発明は、請求項２記載の湿
式電子写真装置において、前記直流電圧に基づき前記転
写手段の転写バイアスを操作する手段を設けたものであ
り、操作性の向上を図ることができる。According to a fourth aspect of the present invention, in the wet electrophotographic apparatus according to the second aspect, there is provided means for operating the transfer bias of the transfer means based on the DC voltage, thereby improving operability. be able to.
【０００９】請求項５に係る発明は、請求項１または２
記載の湿式電子写真装置において、前記交流電圧の周波
数をプロセス速度ｍｍ／ｓｅｃをｍｍ／ｓｅｃで除した
値の２倍以上の値としたものであり、凹凸の画像周波数
を目立たなくすることができる。The invention according to claim 5 is the invention according to claim 1 or 2.
In the wet electrophotographic apparatus described above, the frequency of the AC voltage is set to a value that is at least twice the value obtained by dividing the process speed mm / sec by mm / sec, so that the image frequency of unevenness can be made inconspicuous. .
【００１０】請求項６に係る発明は、請求項１または２
記載の湿式電子写真装置において、前記導電性部材を回
転可能なローラにて構成したものであり、導電性部材が
現像液ミストなどで汚損した場合にも清掃用の拭き取り
部材、かき取り部材などでその汚れを除去することがで
きる。The invention according to claim 6 is the invention according to claim 1 or 2.
In the wet electrophotographic apparatus described, the conductive member is configured by a rotatable roller, even when the conductive member is soiled by a developer mist or the like, a wiping member for cleaning, a scraping member, etc. The dirt can be removed.
【００１１】請求項７に係る発明は、請求項１または２
記載の湿式電子写真装置において、前記導電性部材を板
状電極にて構成したものであり、簡単な構成で低コスト
にできる。The invention according to claim 7 is claim 1 or 2.
In the wet electrophotographic apparatus described above, the conductive member is composed of a plate-shaped electrode, and the cost can be reduced with a simple structure.
【００１２】請求項８に係る発明は、請求項１または２
記載の湿式電子写真装置において、前記導電性部材を導
電性ブラシにて構成したものであり、簡単な構成で低コ
ストにできる。The invention according to claim 8 is claim 1 or 2.
In the wet electrophotographic apparatus described above, the conductive member is composed of a conductive brush, and the cost can be reduced with a simple structure.
【００１３】請求項９に係る発明は、請求項６記載の湿
式電子写真装置において、前記ローラの表面を金属面と
したものであり、前記ローラの清掃用拭き取り部材、か
き取り部材に対する耐久性を向上させることができる。According to a ninth aspect of the present invention, in the wet electrophotographic apparatus according to the sixth aspect, the surface of the roller is a metal surface, and the durability of the roller with respect to a cleaning wiping member and a scraping member is improved. Can be improved.
【００１４】請求項１０に係る発明は、請求項６記載の
湿式電子写真装置において、前記ローラの表面をハード
アルマイト処理面としたものであり、感光体表面の傷な
どに対する局所的な放電を抑制することができる。According to a tenth aspect of the present invention, in the wet electrophotographic apparatus according to the sixth aspect, the surface of the roller is a hard alumite treated surface, and local discharge to a scratch on the surface of the photoconductor is suppressed. can do.
【００１５】請求項１１に係る発明は、請求項６記載の
湿式電子写真装置において、前記ローラの表面を酸化チ
タン薄膜としたものであり、感光体表面の傷などに対す
る局所的な放電を抑制することができ、電圧耐久性も得
られる。According to an eleventh aspect of the present invention, in the wet electrophotographic apparatus according to the sixth aspect, the surface of the roller is a thin film of titanium oxide, which suppresses local discharge due to scratches on the surface of the photoconductor. It is also possible to obtain voltage durability.
【００１６】[0016]
【発明の実施の形態】図１は請求項１、２に係る発明の
一実施形態を示す。この実施形態は複写機、プリンタ、
ファクシミリ等として用いられる湿式電子写真装置の一
実施形態である。感光体、例えば感光体ドラム１１は、
駆動源により回転駆動されて図示しないトナー像形成手
段によりトナー像が形成される。このトナー像形成手段
は、感光体ドラム１１を一様に帯電する帯電手段と、こ
の帯電手段により一様に帯電された感光体ドラム１１の
表面に露光を行って画像を書き込むことにより感光体ド
ラム１１上に静電潜像を形成する露光手段と、感光体ド
ラム１１上の静電潜像を現像液で現像してトナー像とす
る湿式現像装置とからなる。FIG. 1 shows an embodiment of the invention according to the first and second aspects. This embodiment is a copier, printer,
1 is an embodiment of a wet electrophotographic apparatus used as a facsimile or the like. The photoconductor, for example, the photoconductor drum 11,
The toner image is formed by the toner image forming means (not shown) by being rotationally driven by the drive source. The toner image forming means includes a charging means for uniformly charging the photoconductor drum 11, and a photosensitive drum by writing an image by exposing the surface of the photoconductor drum 11 uniformly charged by the charging means. An exposure unit that forms an electrostatic latent image on the photosensitive drum 11 and a wet developing device that develops the electrostatic latent image on the photosensitive drum 11 with a developing solution to form a toner image.
【００１７】トナー像電荷付与装置としてのセット手段
は、上記湿式現像装置と転写手段としての転写帯電ロー
ラ１２との間に感光体ドラム１１に空隙をおいて対向す
るように配置された、感光体ドラム１１に非接触なトナ
ー像電荷付与用帯電ローラからなるトナー像電荷付与用
導電性部材１３により構成される。電圧印加手段として
の交流・直流電源１４は、帯電ローラ１３と感光体ドラ
ム１１上のトナー像との間の放電開始電圧の２倍以上の
ピーク間電圧を有する交流電圧と直流電圧とを重畳して
帯電ローラ１３に印加する。帯電ローラ１３は、回転す
るように設置された導電性ローラからなり、感光体ドラ
ム１１上のトナー像との間で放電を行う。The setting means as the toner image charge applying device is arranged so as to face the photosensitive drum 11 with a gap between the wet developing device and the transfer charging roller 12 as the transfer means. The toner image charge imparting conductive member 13 is composed of a toner image charge imparting charging roller that is not in contact with the drum 11. The AC / DC power supply 14 as voltage applying means superimposes the AC voltage and the DC voltage having a peak-to-peak voltage that is at least twice the discharge start voltage between the charging roller 13 and the toner image on the photosensitive drum 11. And applies it to the charging roller 13. The charging roller 13 is composed of a conductive roller installed so as to rotate, and discharges between the charging roller 13 and the toner image on the photosensitive drum 11.
【００１８】また、無端の転写ベルト１５は複数のロー
ラに架け渡されて回転駆動され、転写手段としての転写
帯電ローラ１２は帯電ローラ１３よりも感光体ドラム１
１の回転方向下流側で感光体ドラム１１に圧接されて転
写電源１６から転写バイアスが印加される。給紙装置か
ら給紙された記録紙からなる転写体１７は感光体ドラム
１１と転写帯電ローラ１２とのニップ部を通過する際に
感光体ドラム１１上のトナー像が転写されて感光体ドラ
ム１１から分離される。この記録紙１７は、転写ベルト
１５から分離され、定着装置によりトナー像が定着され
る。また、感光体ドラム１１はトナー像転写後にクリー
ニング装置によりクリーニングされ、転写電荷用モニタ
１８は転写電流をモニタする。Further, the endless transfer belt 15 is spanned by a plurality of rollers and is rotationally driven, and the transfer charging roller 12 as a transfer means is more sensitive than the charging roller 13 to the photosensitive drum 1.
The transfer bias is applied from the transfer power supply 16 by being pressed against the photosensitive drum 11 on the downstream side in the rotating direction of 1. When the transfer body 17 made of recording paper fed from the paper feeding device passes through the nip portion between the photoconductor drum 11 and the transfer charging roller 12, the toner image on the photoconductor drum 11 is transferred and the photoconductor drum 11 is transferred. Separated from. The recording paper 17 is separated from the transfer belt 15, and the toner image is fixed by the fixing device. Further, the photosensitive drum 11 is cleaned by the cleaning device after the toner image is transferred, and the transfer charge monitor 18 monitors the transfer current.
【００１９】ところで、帯電ローラ１３と感光体ドラム
１１上のトナー像との間で放電が行われることにより、
感光体ドラム１１上のトナー像は電荷が付与されてトナ
ー同士及び感光体ドラム１１との結合力が増し安定した
像となるというセット効果が得られる。この場合、帯電
ローラ１３と感光体ドラム１１との間の放電は双方向
（±方向）で起こり、感光体ドラム１１上のトナーの単
位質量当たりの電荷量（Ｑ／ｍ）の上昇が抑えられる。By the way, by discharging between the charging roller 13 and the toner image on the photosensitive drum 11,
The toner image on the photosensitive drum 11 is provided with an electric charge to increase the bonding force between the toners and the photosensitive drum 11 to form a stable image. In this case, discharge between the charging roller 13 and the photoconductor drum 11 occurs in both directions (± directions), and an increase in the amount of charge (Q / m) per unit mass of toner on the photoconductor drum 11 is suppressed. .
【００２０】帯電ローラ１３に電源１４から上記交流電
圧のみを印加した場合には、感光体ドラム１１上のトナ
ー像は帯電ローラ１３通過後の表面電位が０Ｖに近づ
く。帯電ローラ１３に交流・直流電源１４から図２に示
すように上記交流電圧と直流電圧とが重畳した電圧が印
加された場合には、感光体ドラム１１上のトナー像は帯
電ローラ１３通過後の表面電位が上記直流電圧に収れん
する。転写工程での必要転写電流は感光体ドラム１１上
のトナー像の表面電位に依存し、交流・直流電源１４の
出力電圧の直流成分により転写工程での必要転写電流を
操作することができる。When only the AC voltage is applied to the charging roller 13 from the power source 14, the surface potential of the toner image on the photosensitive drum 11 approaches 0V after passing through the charging roller 13. When a voltage obtained by superposing the AC voltage and the DC voltage is applied to the charging roller 13 from the AC / DC power source 14 as shown in FIG. The surface potential converges on the DC voltage. The required transfer current in the transfer step depends on the surface potential of the toner image on the photosensitive drum 11, and the required transfer current in the transfer step can be controlled by the DC component of the output voltage of the AC / DC power supply 14.
【００２１】このように、本実施形態は、請求項１に係
る発明の実施形態であって、感光体としての感光体ドラ
ム１１上にトナー像を形成するトナー像形成手段と、こ
のトナー像形成手段により感光体１１上に形成されたト
ナー像に放電により電荷を付与して該トナー像を安定化
するセット手段と、このセット手段により電荷が付与さ
れた感光体１１上のトナー像を転写体としての記録紙１
７へ転写させる転写帯電ローラからなる転写手段１２と
を有する湿式電子写真装置において、前記セット手段を
感光体１１に非接触な導電性部材１３から構成し、この
導電性部材１３と感光体１１上のトナー像との間の放電
開始電圧の２倍以上のピーク間電圧を有する交流電圧を
前記導電性部材１３に印加する電圧印加手段としての交
流・直流電源１４を備えたので、必要転写電流を下げる
ことができる。As described above, the present embodiment is an embodiment of the invention according to claim 1, and is a toner image forming means for forming a toner image on the photosensitive drum 11 as a photosensitive member, and the toner image forming means. Setting means for stabilizing the toner image by applying an electric charge to the toner image formed on the photoconductor 11 by the discharging means, and a transfer member for transferring the toner image on the photoconductor 11 charged by the setting means. Paper 1 as
In the wet electrophotographic apparatus having a transfer means 12 composed of a transfer charging roller for transferring to the image forming means 7, the setting means is composed of a conductive member 13 which is not in contact with the photoconductor 11, and the conductive member 13 and the photoconductor 11 Since an AC / DC power supply 14 as a voltage applying means for applying an AC voltage having a peak-to-peak voltage that is at least twice the discharge start voltage to the toner image is provided to the conductive member 13, Can be lowered.
【００２２】また、本実施形態は、請求項２に係る発明
の実施形態であって、請求項１記載の湿式電子写真装置
において、電圧印加手段１４は導電性部材１３に前記交
流電圧と直流電圧とを重畳して印加するので、この直流
電圧により必要転写電流を操作することができる。Further, this embodiment is an embodiment of the invention according to claim 2, and in the wet electrophotographic apparatus according to claim 1, the voltage applying means 14 causes the conductive member 13 to apply the AC voltage and the DC voltage. And are superimposed and applied, the required transfer current can be controlled by this DC voltage.
【００２３】図３は請求項３に係る発明の一実施形態を
示す。この実施形態は、上記請求項１、２に係る発明の
一実施形態において、感光体ドラム１１に対して帯電ロ
ーラ１３と転写帯電ローラ１２との間で光を照射して電
荷を減衰させる感光体電荷減衰用光源１９を設けたもの
である。帯電ローラ１３からの放電による電荷は、感光
体ドラム１１上のトナー像の電荷量を増加させるものだ
けでなく、感光体ドラム１１の地肌、感光体ドラム１１
上のトナー像の表面にとどまるもの（表面電荷）もあ
る。帯電ローラ１３と転写帯電ローラ１２との間で感光
体電荷減衰用光源１９から感光体ドラム１１へ光が照射
されると、その光により感光体ドラム１１の抵抗が下が
ってその表面電荷が感光体ドラム１１を通して逃がされ
る。これにより、必要転写電流が下がる。FIG. 3 shows an embodiment of the invention according to claim 3. In this embodiment, in the embodiment of the invention according to claims 1 and 2, the photoconductor for irradiating the photoconductor drum 11 with light between the charging roller 13 and the transfer charging roller 12 to attenuate the charge. A light source 19 for charge attenuation is provided. The charge generated by the discharge from the charging roller 13 not only increases the charge amount of the toner image on the photoconductor drum 11, but also the background of the photoconductor drum 11 and the photoconductor drum 11
Some remain on the surface of the toner image above (surface charge). When light is applied to the photoconductor drum 11 from the photoconductor charge attenuation light source 19 between the charging roller 13 and the transfer charge roller 12, the resistance of the photoconductor drum 11 is lowered by the light and the surface charge of the photoconductor drum 11 is reduced. Escaped through the drum 11. As a result, the required transfer current is reduced.
【００２４】このように、本実施形態は、請求項３に係
る発明の実施形態であって、請求項１または２記載の湿
式電子写真装置において、感光体１１に対してセット手
段１３と転写手段１２との間で光を照射して電荷を減衰
させる感光体電荷減衰用光源１９を設けたので、必要転
写電流を下げることができる。As described above, the present embodiment is an embodiment of the invention according to claim 3, and in the wet electrophotographic apparatus according to claim 1 or 2, the setting means 13 and the transfer means are set with respect to the photoconductor 11. Since the photoconductor charge attenuating light source 19 for radiating light between the photoconductor 12 and the photoconductor 12 is provided, the required transfer current can be reduced.
【００２５】図４は請求項４に係る発明の一実施形態を
示す。この実施形態は、上記請求項１、２に係る発明の
一実施形態において、交流・直流電源１４の出力電圧の
直流成分に基づき転写電源１６の出力転写バイアスを操
作する操作手段２０を設けたものである。セット効果に
適した交流・直流電源１４の出力電圧の直流成分はトナ
ーの種類、記録紙１７の種類により異なる。例えば、交
流・直流電源１４の出力電圧の直流成分は、表面の比較
的粗い記録紙では低めの直流電圧が良く、表面の比較的
滑らかな記録紙では高めの直流電圧が良い。そこで、操
作手段２０は交流・直流電源１４の出力電圧の直流成分
に基づき自動的に転写電源１６の出力電圧を操作するこ
とにより転写帯電ローラ１２の転写電圧を操作し、これ
により転写電圧の手動調整が不要になって操作性の向上
を図ることができる。FIG. 4 shows an embodiment of the invention according to claim 4. In this embodiment, in one embodiment of the invention according to claims 1 and 2, the operating means 20 for operating the output transfer bias of the transfer power supply 16 based on the DC component of the output voltage of the AC / DC power supply 14 is provided. Is. The DC component of the output voltage of the AC / DC power supply 14 suitable for the set effect varies depending on the type of toner and the type of recording paper 17. For example, the DC component of the output voltage of the AC / DC power supply 14 is preferably a low DC voltage on a recording paper with a relatively rough surface, and a high DC voltage on a recording paper with a relatively smooth surface. Therefore, the operating means 20 automatically operates the output voltage of the transfer power supply 16 based on the DC component of the output voltage of the AC / DC power supply 14 to operate the transfer voltage of the transfer charging roller 12, thereby manually operating the transfer voltage. Adjustment is unnecessary, and operability can be improved.
【００２６】このように、本実施形態は、請求項４に係
る発明の実施形態であって、請求項２記載の湿式電子写
真装置において、交流・直流電源１４の出力電圧の直流
成分に基づき転写手段１２の転写バイアスを操作する操
作手段２０を設けたので、操作性の向上を図ることがで
きる。As described above, this embodiment is an embodiment of the invention according to claim 4, and in the wet electrophotographic apparatus according to claim 2, the transfer is performed based on the DC component of the output voltage of the AC / DC power supply 14. Since the operating means 20 for operating the transfer bias of the means 12 is provided, the operability can be improved.
【００２７】請求項５に係る発明の一実施形態は、上記
請求項１、２に係る発明の一実施形態において、交流・
直流電源１４の出力電圧の交流成分の周波数をプロセス
速度（感光体ドラム１１や記録紙１７などの線速）ｍｍ
／ｓｅｃをｍｍ／ｓｅｃで除した値の２倍以上の値に設
定したものである。上記トナー像電荷付与装置１３の放
電は、交流・直流電源１４の出力電圧の交流成分の１周
期に付きそれぞれ両極方向（±方向）に１度づつ計２回
起こる。この放電により感光体ドラム１１上のトナー像
に微小な凹凸が発生する。An embodiment of the invention according to claim 5 is the same as the embodiment of the invention according to claims 1 and 2 above.
The frequency of the AC component of the output voltage of the DC power supply 14 is defined as the process speed (the linear speed of the photosensitive drum 11 or the recording paper 17) mm.
/ Sec is divided by mm / sec and is set to a value that is at least twice the value. The discharge of the toner image charge applying device 13 occurs twice, once in each bipolar direction (± direction) for each cycle of the AC component of the output voltage of the AC / DC power supply 14. This discharge causes minute unevenness in the toner image on the photosensitive drum 11.
【００２８】この凹凸のピッチが粗くなると、画像ノイ
ズとして顕在化する（特にベタ部で顕在化する）。この
実施形態では、交流・直流電源１４の出力電圧の交流成
分の周波数をプロセス速度ｍｍ／ｓｅｃをｍｍ／ｓｅｃ
で除した値の２倍以上の値に設定したことにより、凹凸
の画像周波数を４本／ｍｍ以上として感光体ドラム１１
上のトナー像の凹凸を目立たなくすることができる。When the pitch of the unevenness becomes rough, it becomes apparent as image noise (especially at solid areas). In this embodiment, the frequency of the AC component of the output voltage of the AC / DC power supply 14 is set to the process speed mm / sec in mm / sec.
By setting the value equal to or more than twice the value divided by, the image frequency of the unevenness is set to 4 lines / mm or more and the photosensitive drum 11
The unevenness of the upper toner image can be made inconspicuous.
【００２９】このように、本実施形態は、請求項５に係
る発明の実施形態であって、請求項１または２記載の湿
式電子写真装置において、交流・直流電源１４の出力電
圧の交流成分の周波数をプロセス速度ｍｍ／ｓｅｃをｍ
ｍ／ｓｅｃで除した値の２倍以上の値としたので、凹凸
の画像周波数を４本／ｍｍ以上として目立たなくするこ
とができる。As described above, this embodiment is an embodiment of the invention according to claim 5, and in the wet electrophotographic apparatus according to claim 1 or 2, the AC component of the output voltage of the AC / DC power source 14 Frequency is process speed mm / sec is m
Since the value is twice or more the value divided by m / sec, it is possible to make the image frequency of the concavities and convexities 4 lines / mm or more inconspicuous.
【００３０】上記請求項１、２に係る発明の一実施形態
は、請求項６に係る発明の一実施形態でもあり、セット
手段としての導電性部材１３を回転可能な帯電ローラで
構成したものである。この帯電ローラ１３の特徴は、現
像液ミストなどで汚損した場合にも清掃用の拭き取り部
材、かき取り部材などでその汚れを除去できることであ
る。An embodiment of the invention according to claims 1 and 2 is also an embodiment of the invention according to claim 6, in which the conductive member 13 as the setting means is constituted by a rotatable charging roller. is there. The characteristic of the charging roller 13 is that even if the charging roller 13 is contaminated by a developer mist, the contamination can be removed by a cleaning wiping member, a scraping member, or the like.
【００３１】このように、本実施形態は、請求項６に係
る発明の実施形態では、請求項１または２記載の湿式電
子写真装置において、導電性部材１３を回転可能なロー
ラにて構成したので、導電性部材が現像液ミストなどで
汚損した場合にも拭き取り部材、かき取り部材などでそ
の汚れを除去することができる。As described above, in this embodiment, in the embodiment of the invention according to claim 6, in the wet electrophotographic apparatus according to claim 1 or 2, the conductive member 13 is composed of a rotatable roller. Even when the conductive member is contaminated by the developer mist, the stain can be removed by the wiping member, the scraping member, or the like.
【００３２】図５は請求項７に係る発明の一実施形態を
示す。この実施形態は、上記請求項１、２に係る発明の
一実施形態において、導電性部材１３を板状電極１３ａ
にて構成するようにしたものである。板状電極１３ａは
交流・直流電源１４から帯電ローラ１３と感光体ドラム
１１上のトナー像との間の放電開始電圧の２倍以上のピ
ーク間電圧を有する交流電圧と直流電圧とを重畳した電
圧が印加され、板状電極１３ａと感光体ドラム１１との
間で放電が起こる。このため、感光体ドラム１１上のト
ナー像は電荷が付与されてトナー同士及び感光体ドラム
１１との結合力が増し安定した像となるというセット効
果が得られる。板状電極１３ａを用いる利点は構成が簡
単で低コストにできることである。FIG. 5 shows an embodiment of the invention according to claim 7. In this embodiment, in the embodiment of the invention according to claims 1 and 2, the conductive member 13 is connected to the plate electrode 13a.
It is configured to. The plate-shaped electrode 13a is a voltage obtained by superimposing an AC voltage and a DC voltage, which have a peak-to-peak voltage that is twice or more the discharge start voltage between the charging roller 13 and the toner image on the photosensitive drum 11 from the AC / DC power supply 14. Is applied, and a discharge occurs between the plate electrode 13a and the photoconductor drum 11. For this reason, the toner image on the photoconductor drum 11 is provided with an electric charge, and the coupling force between the toner and the photoconductor drum 11 is increased, so that a stable image is obtained. The advantage of using the plate electrode 13a is that the configuration is simple and the cost can be reduced.
【００３３】このように、本実施形態は、請求項７に係
る発明の一実施形態であって、請求項１または２記載の
湿式電子写真装置において、前記導電性部材１３を板状
電極１３ａにて構成したので、簡単な構成で低コストに
できる。As described above, this embodiment is an embodiment of the invention according to claim 7, and in the wet electrophotographic apparatus according to claim 1 or 2, the conductive member 13 is formed on the plate electrode 13a. Since it is configured as described above, the cost can be reduced with a simple configuration.
【００３４】図６は請求項８に係る発明の一実施形態を
示す。この実施形態は、上記請求項１、２に係る発明の
一実施形態において、導電性部材１３を導電性ブラシ１
３ｂにて構成するようにしたものである。導電性ブラシ
１３ｂは交流・直流電源１４から帯電ローラ１３と感光
体ドラム１１上のトナー像との間の放電開始電圧の２倍
以上のピーク間電圧を有する交流電圧と直流電圧とを重
畳した電圧が印加され、導電性ブラシ１３ｂと感光体ド
ラム１１との間で放電が起こる。このため、感光体ドラ
ム１１上のトナー像は電荷が付与されてトナー同士及び
感光体ドラム１１との結合力が増し安定した像となると
いうセット効果が得られる。導電性ブラシ１３ｂを用い
る利点は構成が簡単で低コストにできることである。FIG. 6 shows an embodiment of the invention according to claim 8. In this embodiment, in the embodiment of the invention according to claims 1 and 2, the conductive member 13 is replaced by the conductive brush 1.
3b. The conductive brush 13b is a voltage obtained by superimposing an AC voltage and a DC voltage from the AC / DC power supply 14 having a peak-to-peak voltage that is at least twice the discharge start voltage between the charging roller 13 and the toner image on the photosensitive drum 11. Is applied, and a discharge occurs between the conductive brush 13b and the photoconductor drum 11. For this reason, the toner image on the photoconductor drum 11 is provided with an electric charge, and the coupling force between the toner and the photoconductor drum 11 is increased, so that a stable image is obtained. The advantage of using the conductive brush 13b is that the structure is simple and the cost can be reduced.
【００３５】このように、本実施形態は、請求項８に係
る発明の一実施形態であって、請求項１または２記載の
湿式電子写真装置において、前記導電性部材１３を導電
性ブラシ１３６にて構成したので、簡単な構成で低コス
トにできる。As described above, this embodiment is an embodiment of the invention according to claim 8, and in the wet electrophotographic apparatus according to claim 1 or 2, the conductive member 13 is replaced by the conductive brush 136. Since it is configured as described above, the cost can be reduced with a simple configuration.
【００３６】請求項９に係る発明の一実施形態は、上記
請求項６に係る発明の一実施形態において、回転可能な
帯電ローラからなる導電性部材１３の表面を金属面にし
たものである。これにより、導電性部材１３は、清掃用
の拭き取り部材、かき取り部材に対する耐久性が向上
し、また、大電流発生防止用に保護抵抗を設けることも
有効である。An embodiment of the invention according to claim 9 is the same as the embodiment of the invention according to claim 6, in which the surface of the conductive member 13 composed of a rotatable charging roller is a metal surface. As a result, the conductive member 13 has improved durability with respect to a cleaning wiping member and a scraping member, and it is also effective to provide a protective resistance for preventing a large current from occurring.
【００３７】このように、請求項９に係る発明の一実施
形態では、請求項６記載の湿式電子写真装置において、
ローラ１３の表面を金属面としたので、ローラの清掃用
拭き取り部材、かき取り部材に対する耐久性を向上させ
ることができる。As described above, in one embodiment of the invention according to claim 9, in the wet electrophotographic apparatus according to claim 6,
Since the surface of the roller 13 is a metal surface, the durability of the roller for cleaning wiping members and scraping members can be improved.
【００３８】請求項１０に係る発明の一実施形態は、上
記請求項６に係る発明の一実施形態において、回転可能
な帯電ローラからなる導電性部材１３の表面をハードア
ルマイト処理面としたものである。これにより、感光体
ドラム１１表面の傷などの局所的な放電を抑制すること
ができる。An embodiment according to a tenth aspect of the present invention is the one embodiment according to the sixth aspect of the invention, wherein the surface of the conductive member 13 composed of a rotatable charging roller is a hard alumite treated surface. is there. As a result, local discharge such as scratches on the surface of the photoconductor drum 11 can be suppressed.
【００３９】このように、請求項１０に係る発明の一実
施形態では、請求項６記載の湿式電子写真装置におい
て、前記ローラ１３の表面をハードアルマイト処理面と
したので、感光体表面の傷などに対する局所的な放電を
抑制することができる。As described above, in one embodiment of the invention according to claim 10, in the wet electrophotographic apparatus according to claim 6, since the surface of the roller 13 is a hard alumite treated surface, scratches on the surface of the photosensitive member, etc. Can be suppressed from being locally discharged.
【００４０】請求項１１に係る発明の一実施形態は、上
記請求項６に係る発明の一実施形態において、回転可能
な帯電ローラからなる導電性部材１３の表面を酸化チタ
ン薄膜面としたものである。これにより、帯電ローラ１
３は電圧依存性を有する抵抗成分が得られ、感光体ドラ
ム１１表面の傷などに対する局所的な放電を抑制するこ
とができ、また、ローラ１３は電圧耐久性も得られる。An embodiment of the invention according to claim 11 is the embodiment of the invention according to claim 6 in which the surface of the conductive member 13 comprising a rotatable charging roller is a titanium oxide thin film surface. is there. As a result, the charging roller 1
In No. 3, a resistance component having voltage dependency is obtained, local discharge due to scratches on the surface of the photosensitive drum 11 can be suppressed, and the roller 13 also has voltage durability.
【００４１】このように、請求項１１に係る発明の一実
施形態では、請求項６記載の湿式電子写真装置におい
て、前記ローラ１３の表面を酸化チタン薄膜としたの
で、感光体表面の傷などに対する局所的な放電を抑制す
ることができ、電圧耐久性も得られる。As described above, according to the eleventh aspect of the present invention, in the wet electrophotographic apparatus according to the sixth aspect, since the surface of the roller 13 is a titanium oxide thin film, it is possible to prevent scratches on the surface of the photoconductor. Local discharge can be suppressed and voltage durability can be obtained.
【００４２】なお、各請求項に係る発明は、上記実施形
態に限定されるものではなく、例えば転写ベルト１５を
用いずに感光体ドラム１１上のトナー像を転写手段によ
り記録紙に転写したり感光体ドラム１１上のトナー像を
転写手段により記録紙以外の転写体に転写したりする場
合などにも同様に適用することができる。The invention according to each claim is not limited to the above-described embodiment, and for example, the toner image on the photosensitive drum 11 is transferred to the recording paper by the transfer means without using the transfer belt 15. The same can be applied to the case where the toner image on the photoconductor drum 11 is transferred to a transfer body other than the recording paper by the transfer means.
【００４３】[0043]
【発明の効果】以上のように請求項１に係る発明によれ
ば、感光体上にトナー像を形成するトナー像形成手段
と、このトナー像形成手段により前記感光体上に形成さ
れたトナー像に放電により電荷を付与して該トナー像を
安定化するセット手段と、このセット手段により電荷が
付与された前記感光体上のトナー像を転写体へ転写させ
る転写手段とを有する湿式電子写真装置において、前記
セット手段を前記感光体に非接触な導電性部材から構成
し、この導電性部材と前記感光体上のトナー像との間の
放電開始電圧の２倍以上のピーク間電圧を有する交流電
圧を前記導電性部材に印加する電圧印加手段を備えたの
で、必要転写電流を下げることができる。As described above, according to the first aspect of the invention, the toner image forming means for forming a toner image on the photoconductor and the toner image formed on the photoconductor by the toner image forming means. Wet electrophotographic apparatus having setting means for stabilizing the toner image by applying an electric charge to the transfer member and a transfer means for transferring the toner image on the photoconductor to which the electric charge is applied by the setting means to a transfer body. In the above, the setting means comprises a conductive member that is not in contact with the photoconductor, and an alternating current having a peak-to-peak voltage that is at least twice the discharge start voltage between the conductive member and the toner image on the photoconductor. Since the voltage applying means for applying a voltage to the conductive member is provided, the required transfer current can be reduced.
【００４４】請求項２に係る発明によれば、請求項１記
載の湿式電子写真装置において、前記電圧印加手段は前
記導電性部材に前記交流電圧と直流電圧とを重畳して印
加するので、直流電圧により必要転写電流を操作するこ
とができる。According to the second aspect of the present invention, in the wet electrophotographic apparatus according to the first aspect, the voltage applying means applies the alternating voltage and the direct current voltage to the conductive member in a superimposed manner. The required transfer current can be manipulated by the voltage.
【００４５】請求項３に係る発明によれば、請求項１ま
たは２記載の湿式電子写真装置において、前記感光体に
対して前記セット手段と前記転写手段との間で光を照射
して電荷を減衰させる感光体電荷減衰用光源を設けたの
で、必要転写電流を下げることができる。According to the third aspect of the invention, in the wet electrophotographic apparatus according to the first or second aspect, light is applied to the photoconductor between the setting means and the transfer means to charge the photoreceptor. Since the light source for attenuating the photoreceptor charge is provided, the required transfer current can be reduced.
【００４６】請求項４に係る発明によれば、請求項２記
載の湿式電子写真装置において、前記直流電圧に基づき
前記転写手段の転写バイアスを操作する手段を設けたの
で、操作性の向上を図ることができる。According to the fourth aspect of the invention, in the wet electrophotographic apparatus according to the second aspect, means for operating the transfer bias of the transfer means based on the DC voltage is provided, so that the operability is improved. be able to.
【００４７】請求項５に係る発明によれば、請求項１ま
たは２記載の湿式電子写真装置において、前記交流電圧
の周波数をプロセス速度ｍｍ／ｓｅｃをｍｍ／ｓｅｃで
除した値の２倍以上の値としたので、凹凸の画像周波数
を目立たなくすることができる。According to a fifth aspect of the present invention, in the wet electrophotographic apparatus according to the first or second aspect, the frequency of the AC voltage is at least twice the value obtained by dividing the process speed mm / sec by the mm / sec. Since the value is used, the image frequency of the unevenness can be made inconspicuous.
【００４８】請求項６に係る発明によれば、請求項１ま
たは２記載の湿式電子写真装置において、前記導電性部
材を回転可能なローラにて構成したので、導電性部材が
現像液ミストなどで汚損した場合にも拭き取り部材、か
き取り部材などでその汚れを除去することができる。According to the sixth aspect of the present invention, in the wet electrophotographic apparatus according to the first or second aspect, since the conductive member is composed of a rotatable roller, the conductive member is a developer mist or the like. Even if it is soiled, it can be removed by a wiping member, a scraping member, or the like.
【００４９】請求項７に係る発明によれば、請求項１ま
たは２記載の湿式電子写真装置において、前記導電性部
材を板状電極にて構成したので、簡単な構成で低コスト
にできる。According to the seventh aspect of the invention, in the wet electrophotographic apparatus according to the first or second aspect, since the conductive member is composed of the plate-shaped electrode, it is possible to reduce the cost with a simple structure.
【００５０】請求項８に係る発明によれば、請求項１ま
たは２記載の湿式電子写真装置において、前記導電性部
材を導電性ブラシにて構成したので、簡単な構成で低コ
ストにできる。According to the eighth aspect of the present invention, in the wet electrophotographic apparatus according to the first or second aspect, since the conductive member is made of a conductive brush, the structure is simple and the cost can be reduced.
【００５１】請求項９に係る発明によれば、請求項６記
載の湿式電子写真装置において、前記ローラの表面を金
属面としたので、前記ローラの清掃用拭き取り部材、か
き取り部材に対する耐久性を向上させることができる。According to the invention of claim 9, in the wet electrophotographic apparatus of claim 6, since the surface of the roller is a metal surface, the durability of the roller with respect to the cleaning wiping member and the scraping member is improved. Can be improved.
【００５２】請求項１０に係る発明によれば、請求項６
記載の湿式電子写真装置において、前記ローラの表面を
ハードアルマイト処理面としたので、感光体表面の傷な
どに対する局所的な放電を抑制することができる。According to the invention of claim 10, claim 6
In the wet electrophotographic apparatus described above, since the surface of the roller is a hard alumite treated surface, it is possible to suppress local discharge to a scratch on the surface of the photoconductor.
【００５３】請求項１１に係る発明によれば、請求項６
記載の湿式電子写真装置において、前記ローラの表面を
酸化チタン薄膜としたので、感光体表面の傷などに対す
る局所的な放電を抑制することができ、電圧耐久性も得
られる。According to the invention of claim 11, claim 6
In the wet electrophotographic apparatus described above, since the surface of the roller is made of a titanium oxide thin film, it is possible to suppress local discharge due to scratches on the surface of the photoconductor and also obtain voltage durability.
【図１】請求項１、２に係る発明の一実施形態を示す概
略図である。FIG. 1 is a schematic view showing an embodiment of the invention according to claims 1 and 2.
【図２】同実施形態における交流・直流電源の出力電圧
波形を示す波形図である。FIG. 2 is a waveform diagram showing an output voltage waveform of the AC / DC power supply in the same embodiment.
【図３】請求項３に係る発明の一実施形態を示す概略図
である。FIG. 3 is a schematic view showing an embodiment of the invention according to claim 3;
【図４】請求項４に係る発明の一実施形態を示す概略図
である。FIG. 4 is a schematic view showing an embodiment of the invention according to claim 4;
【図５】請求項７に係る発明の一実施形態を示す概略図
である。FIG. 5 is a schematic view showing an embodiment of the invention according to claim 7;
【図６】請求項８に係る発明の一実施形態を示す概略図
である。FIG. 6 is a schematic view showing an embodiment of the invention according to claim 8;
１１ 感光体ドラム １２ 転写帯電ローラ １３ トナー像電荷付与用帯電ローラ １４ 交流・直流電源 １５ 転写ベルト １６ 転写電源 １７ 記録紙 １９ 感光体電荷減衰用光源 ２０ 操作手段 １３ｂ 導電性ブラシ １３ａ 板状電極 11 Photoreceptor Drum 12 Transfer Charging Roller 13 Toner Image Charging Charging Roller 14 AC / DC Power Supply 15 Transfer Belt 16 Transfer Power Supply 17 Recording Paper 19 Photoreceptor Charge Attenuation Light Source 20 Operating Means 13b Conductive Brush 13a Plate Electrode
───────────────────────────────────────────────────── フロントページの続き (72)発明者 岩井 貞之 東京都大田区中馬込１丁目３番６号・株式 会社リコー内 (72)発明者 黒鳥 恒夫 東京都大田区中馬込１丁目３番６号・株式 会社リコー内 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Sadayuki Iwai 1-3-6 Nakamagome, Ota-ku, Tokyo, Ricoh Co., Ltd. (72) Tsuneo Kuroto 1-3-6 Nakamagome, Ota-ku, Tokyo・ Inside Ricoh Co., Ltd.
Claims (11)
成手段と、このトナー像形成手段により前記感光体上に
形成されたトナー像に放電により電荷を付与して該トナ
ー像を安定化するセット手段と、このセット手段により
電荷が付与された前記感光体上のトナー像を転写体へ転
写させる転写手段とを有する湿式電子写真装置におい
て、前記セット手段を前記感光体に非接触な導電性部材
から構成し、この導電性部材と前記感光体上のトナー像
との間の放電開始電圧の２倍以上のピーク間電圧を有す
る交流電圧を前記導電性部材に印加する電圧印加手段を
備えたことを特徴とする湿式電子写真装置。1. A toner image forming means for forming a toner image on a photoconductor, and a charge is applied to the toner image formed on the photoconductor by the toner image forming means by discharging to stabilize the toner image. In a wet electrophotographic apparatus having a setting means for setting and a transfer means for transferring the toner image on the photoconductor charged by the setting means to a transfer body, the setting means is provided with a non-contact conductive material. And a voltage applying means for applying to the conductive member an AC voltage having a peak-to-peak voltage that is at least twice the discharge start voltage between the conductive member and the toner image on the photoconductor. A wet electrophotographic apparatus characterized in that
て、前記電圧印加手段は前記導電性部材に前記交流電圧
と直流電圧とを重畳して印加することを特徴とする湿式
電子写真装置。2. The wet electrophotographic apparatus according to claim 1, wherein the voltage applying means applies the AC voltage and the DC voltage to the conductive member in a superimposed manner.
において、前記感光体に対して前記セット手段と前記転
写手段との間で光を照射して電荷を減衰させる感光体電
荷減衰用光源を設けたことを特徴とする湿式電子写真装
置。3. A wet type electrophotographic apparatus according to claim 1 or 2, wherein the photoconductor charge attenuating light source for radiating light to the photoconductor between the setting means and the transfer means to attenuate the charge. A wet electrophotographic apparatus, which is provided with a.
て、前記直流電圧に基づき前記転写手段の転写バイアス
を操作する手段を設けたことを特徴とする湿式電子写真
装置。4. The wet electrophotographic apparatus according to claim 2, further comprising means for operating a transfer bias of the transfer means based on the DC voltage.
において、前記交流電圧の周波数をプロセス速度ｍｍ／
ｓｅｃをｍｍ／ｓｅｃで除した値の２倍以上の値とした
ことを特徴とする湿式電子写真装置。5. The wet electrophotographic apparatus according to claim 1, wherein the frequency of the AC voltage is a process speed mm /
A wet electrophotographic apparatus, wherein a value obtained by dividing sec by mm / sec is twice or more.
において、前記導電性部材を回転可能なローラにて構成
したことを特徴とする湿式電子写真装置。6. The wet electrophotographic apparatus according to claim 1, wherein the conductive member is composed of a rotatable roller.
において、前記導電性部材を板状電極にて構成したこと
を特徴とする湿式電子写真装置。7. The wet electrophotographic apparatus according to claim 1 or 2, wherein the conductive member is composed of a plate electrode.
において、前記導電性部材を導電性ブラシにて構成した
ことを特徴とする湿式電子写真装置。8. A wet electrophotographic apparatus according to claim 1, wherein the conductive member is a conductive brush.
て、前記ローラの表面を金属面としたことを特徴とする
湿式電子写真装置。9. The wet electrophotographic apparatus according to claim 6, wherein the surface of the roller is a metal surface.
て、前記ローラの表面をハードアルマイト処理面とした
ことを特徴とする湿式電子写真装置。10. The wet electrophotographic apparatus according to claim 6, wherein the surface of the roller is a hard alumite treated surface.
て、前記ローラの表面を酸化チタン薄膜としたことを特
徴とする湿式電子写真装置。11. The wet electrophotographic apparatus according to claim 6, wherein the surface of the roller is a titanium oxide thin film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12154596A JP3515856B2 (en) | 1996-05-16 | 1996-05-16 | Wet electrophotographic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12154596A JP3515856B2 (en) | 1996-05-16 | 1996-05-16 | Wet electrophotographic equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09305035A true JPH09305035A (en) | 1997-11-28 |
| JP3515856B2 JP3515856B2 (en) | 2004-04-05 |
Family
ID=14813907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12154596A Expired - Fee Related JP3515856B2 (en) | 1996-05-16 | 1996-05-16 | Wet electrophotographic equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3515856B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007041457A (en) * | 2005-08-05 | 2007-02-15 | Mitsubishi Heavy Ind Ltd | Wet type electrophotographic apparatus |
| WO2014120155A1 (en) | 2013-01-30 | 2014-08-07 | Hewlett-Packard Development Company, L.P. | Control for a non-contact charging roller |
| JP2016188991A (en) * | 2015-03-19 | 2016-11-04 | 株式会社リコー | Image forming apparatus |
-
1996
- 1996-05-16 JP JP12154596A patent/JP3515856B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007041457A (en) * | 2005-08-05 | 2007-02-15 | Mitsubishi Heavy Ind Ltd | Wet type electrophotographic apparatus |
| WO2014120155A1 (en) | 2013-01-30 | 2014-08-07 | Hewlett-Packard Development Company, L.P. | Control for a non-contact charging roller |
| CN104956268A (en) * | 2013-01-30 | 2015-09-30 | 惠普发展公司，有限责任合伙企业 | Control for a non-contact charging roller |
| EP2951646A4 (en) * | 2013-01-30 | 2016-11-23 | Hewlett Packard Development Co | Control for a non-contact charging roller |
| JP2016188991A (en) * | 2015-03-19 | 2016-11-04 | 株式会社リコー | Image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3515856B2 (en) | 2004-04-05 |
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