JPH10222011A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPH10222011A JPH10222011A JP9039737A JP3973797A JPH10222011A JP H10222011 A JPH10222011 A JP H10222011A JP 9039737 A JP9039737 A JP 9039737A JP 3973797 A JP3973797 A JP 3973797A JP H10222011 A JPH10222011 A JP H10222011A
- Authority
- JP
- Japan
- Prior art keywords
- photosensitive drum
- drum
- cylindrical
- image forming
- cylindrical drum
- 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
Links
Landscapes
- Electrophotography Configuration And Component (AREA)
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
- Cleaning In Electrography (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、レ−ザプリンタ
や電子複写機等の画像形成装置、特に感光体ドラムの振
動による画質の劣化の防止に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a laser printer and an electronic copier, and more particularly to prevention of deterioration of image quality due to vibration of a photosensitive drum.
【０００２】[0002]
【従来の技術】電子写真方式を使用した電子写真複写機
などにおいては、印刷媒体として感光体ドラムが使用さ
れている。この感光体ドラムはアルミニウムなどの導体
で形成された円筒状のドラムの外周面に光導電体が塗布
されている。そして一様に帯電した感光体ドラム表面の
光導電体は光書込系から送られた画像情報を含む光によ
って物性変化を引き起こして、感光体ドラム表面に静電
潜像を形成する。形成された静電潜像はトナ−により顕
像化されて記録紙に転写して画像を形成する。画像を転
写後に感光体ドラムに残ったトナ−は掻き落されて除去
される。2. Description of the Related Art In an electrophotographic copying machine using an electrophotographic system, a photosensitive drum is used as a printing medium. In this photosensitive drum, a photoconductor is applied to an outer peripheral surface of a cylindrical drum formed of a conductor such as aluminum. The uniformly charged photoconductor on the surface of the photosensitive drum causes a change in physical properties by light including image information sent from the optical writing system, and forms an electrostatic latent image on the surface of the photosensitive drum. The formed electrostatic latent image is visualized by a toner and transferred to a recording sheet to form an image. The toner remaining on the photosensitive drum after transferring the image is scraped off and removed.
【０００３】電子写真複写機等に使用される感光体ドラ
ムは、感光体ドラムを回転駆動するモ−タやギヤ−等の
駆動機構の振動により共振を起こす。また、感光体ドラ
ムとクリ−ニング装置のクリ−ニングブレ−ドとの間に
働く摩擦力によっても振動を発生する。A photosensitive drum used in an electrophotographic copying machine or the like resonates due to vibration of a driving mechanism such as a motor or a gear for rotating the photosensitive drum. Vibration is also generated by the frictional force acting between the photosensitive drum and the cleaning blade of the cleaning device.
【０００４】この感光体ドラムに発生する振動を低減し
た画像形成装置が、例えば特開昭63−271388号公報や特
開昭64−7089号公報に示されている。特開昭63−271388
号公報に示された画像形成装置は、感光体ドラムの内壁
面と接触する発泡ポリウレタン等の制振部材を感光体ド
ラムの内部に設けて、感光体ドラムの振動を減衰させる
ようにして、耳障りな高周波の異常騒音が発生すること
を防止している。また、特開昭64−7089号公報に示され
た画像形成装置は、発泡ポリウレタン等の制振部材を感
光体ドラムの内部に圧入して感光体ドラムの振動を減衰
させ、高周波の異常騒音が発生することを防止してい
る。An image forming apparatus in which the vibration generated in the photosensitive drum is reduced is disclosed in, for example, JP-A-63-271388 and JP-A-64-7089. JP-A-63-271388
The image forming apparatus disclosed in Japanese Patent Application Laid-Open Publication No. H10-15095 has a vibration damping member made of foamed polyurethane or the like that comes into contact with the inner wall surface of the photosensitive drum inside the photosensitive drum to attenuate the vibration of the photosensitive drum. The generation of abnormal high frequency noise is prevented. Further, in the image forming apparatus disclosed in Japanese Patent Application Laid-Open No. 64-7089, a vibration damping member such as foamed polyurethane is pressed into the inside of the photosensitive drum to attenuate the vibration of the photosensitive drum, and abnormal high frequency noise is generated. It prevents that from happening.
【０００５】[0005]
【発明が解決しようとする課題】電子写真複写機等で高
画質化を阻害する要因の１つにジタ−、バンディングと
呼ばれる現象がある。特にディジタル技術の導入により
画質の向上が進められるとレ−ザビ−ムによる書き込み
の１ラインごとの位置精度が厳しく要求され、これを支
配する要因の１つである感光体ドラムの駆動を精度良く
達成することが良質な画像を形成するために必要であ
る。One of the factors inhibiting high image quality in an electrophotographic copying machine or the like is a phenomenon called jitter or banding. In particular, if the image quality is improved by the introduction of digital technology, the positional accuracy of each line of writing by laser beam is strictly required, and the driving of the photosensitive drum, which is one of the factors controlling this, is precisely performed. Achieving is necessary to form a good quality image.
【０００６】また、画像の可視感度と空間周波数の関係
は、人間の視覚系の特性から、空間周波数が0.2〜２ラ
インペア／ｍｍの範囲での濃度変化が最も目につき易い
といわれている。これと感光体ドラムの回転速度を考え
あわせると、良質な画像を形成するためには、感光体ド
ラムの数Ｈｚから300Ｈｚの周波数帯域における回転速
度変動を回避することが要求される。The relationship between the visual sensitivity of an image and the spatial frequency is said to be most noticeable when the spatial frequency is in the range of 0.2 to 2 line pairs / mm due to the characteristics of the human visual system. Considering this and the rotation speed of the photosensitive drum, it is required to avoid the rotation speed fluctuation in the frequency band of several Hz to 300 Hz in order to form a high quality image.
【０００７】しかしながら、特開昭63−271388号公報等
に示されたように、感光体ドラムの捩り振動による高周
波成分を減衰させるようにしても、感光体ドラム自身の
固有振動数が約300Ｈｚ以下の低周波数帯域にあった場
合、感光体ドラム周辺に存在する駆動源より発生する加
振周波数が300Ｈｚ以下の低周波数帯域にあると、感光
体ドラムが共振して回転速度に変動を生じ、レ−ザビ−
ムによる書き込みが乱れ画質の低下を招くという問題が
発生する。However, as disclosed in Japanese Patent Application Laid-Open No. 63-271388, even if the high-frequency component due to the torsional vibration of the photosensitive drum is attenuated, the natural frequency of the photosensitive drum itself is about 300 Hz or less. If the vibration frequency generated by the drive source around the photosensitive drum is in the low frequency band of 300 Hz or less, the photosensitive drum resonates and the rotation speed fluctuates. -Zabi-
This causes a problem that the writing by the system is disturbed and the image quality is deteriorated.
【０００８】また、感光体ドラムの回転速度変動に大き
く影響を与える振動は、感光体ドラムの回転方向に発生
する捩り振動であるが、感光体ドラムの曲げ方向振動も
感光体ドラムを支持する側板やベ−スなどに影響を及ぼ
し画像の画質の低下を引き起こす可能性がある。The vibration which greatly affects the rotation speed fluctuation of the photoconductor drum is torsional vibration generated in the rotation direction of the photoconductor drum, but the vibration in the bending direction of the photoconductor drum is also affected by the side plate supporting the photoconductor drum. And the quality of the image may be degraded.
【０００９】この発明はかかる短所を改善するためにな
されたものであり、感光体ドラムの共振周波数を低い周
波数帯域から高い周波数帯域にシフトさせるとともにク
リ−ニングブレ−トと感光体ドラムとに発生するスティ
ックスリップの発生周波数に対し、感光体ドラムの固有
振動数に制限を与えて高画質化，低騒音化を図ることが
できる画像形成装置を得ることを目的とするものであ
る。The present invention has been made in order to improve such disadvantages, and shifts the resonance frequency of a photosensitive drum from a low frequency band to a high frequency band, and generates a cleaning blade and a photosensitive drum. It is an object of the present invention to provide an image forming apparatus capable of achieving high image quality and low noise by limiting the natural frequency of the photosensitive drum with respect to the frequency of occurrence of stick-slip.
【００１０】[0010]
【課題を解決するための手段】この発明に係る画像形成
装置は、光導電体を表面に塗布した導体からなる円筒状
ドラムと、円筒状ドラム両端に取り付けられたフランジ
とからなる感光体ドラムを有する画像形成装置におい
て、感光体ドラムの固有振動数ｆｄが、感光体ドラム周
辺に存在する駆動源より発生する加振周波数ｆｇを超え
るように円筒状ドラムの剛性を定めたことを特徴とす
る。An image forming apparatus according to the present invention comprises a photosensitive drum comprising a cylindrical drum made of a conductor having a photoconductor coated on its surface and flanges attached to both ends of the cylindrical drum. The rigidity of the cylindrical drum is determined so that the natural frequency fd of the photosensitive drum exceeds an excitation frequency fg generated by a drive source existing around the photosensitive drum.
【００１１】上記フランジを円筒状ドラムの端部にある
外部フレ−ムと円筒状ドラムの内部にある内部フレ−ム
とを有する中空の円柱状に形成し、内部フレ−ムで軸に
支持させ、感光体ドラムの全長より短い距離で感光体ド
ラムを支持して感光体ドラムの剛性を上げるようにする
と良い。The flange is formed in a hollow cylindrical shape having an outer frame at an end of the cylindrical drum and an inner frame inside the cylindrical drum, and is supported on a shaft by the inner frame. Preferably, the photosensitive drum is supported at a distance shorter than the entire length of the photosensitive drum to increase the rigidity of the photosensitive drum.
【００１２】また、上記円筒状ドラムの内壁に沿って複
数の棒状部材を均等に配分して取り付けて感光体ドラム
の剛性を上げても良い。Further, the rigidity of the photosensitive drum may be increased by equally distributing and attaching a plurality of rod-shaped members along the inner wall of the cylindrical drum.
【００１３】さらに、上記円筒状ドラムの内壁に、長手
方向に沿った複数の凸部を設けたり、円筒状ドラムの内
壁に、内径に沿った凸部を一定ピッチで設けて感光体ド
ラムの剛性を上げても良い。Further, the inner wall of the cylindrical drum may be provided with a plurality of convex portions along the longitudinal direction, or the inner wall of the cylindrical drum may be provided with convex portions along the inner diameter at a constant pitch, so that the rigidity of the photosensitive drum can be improved. May be raised.
【００１４】また、上記円筒状ドラムの厚さを、長手方
向の中心にいくにしたがって連続的に厚くなるように形
成して感光体ドラムの剛性を上げても良い。Further, the rigidity of the photosensitive drum may be increased by forming the thickness of the cylindrical drum so as to increase continuously toward the center in the longitudinal direction.
【００１５】また、上記円筒状ドラムの内部に、中心か
ら内壁に向かう放射状のリブを設けて、感光体ドラムの
剛性を上げるようにしても良い。A radial rib extending from the center toward the inner wall may be provided inside the cylindrical drum to increase the rigidity of the photosensitive drum.
【００１６】さらに、上記感光体ドラムの固有振動数ｆ
ｄを、感光体ドラム周辺に存在する駆動源より発生する
加振周波数ｆｇを超えるようにするとともに、感光体ド
ラムの固有振動数ｆｄを、感光体ドラムに残留したトナ
−を除去するクリ−ニング装置のクリ−ビングブレ−ド
と感光体ドラム表面の間に生じるスティックスリップの
振動数ｆｓに対して、ｆｓ／√２＜ｆｄ＜√２ｆｓの範
囲外に設定することが望ましい。Further, the natural frequency f of the photosensitive drum
d is set to exceed an excitation frequency fg generated by a drive source existing around the photosensitive drum, and the natural frequency fd of the photosensitive drum is reduced to remove toner remaining on the photosensitive drum. It is desirable that the frequency fs of the stick-slip generated between the creeping blade of the apparatus and the surface of the photosensitive drum be set outside the range of fs / √2 <fd <√2fs.
【００１７】[0017]
【発明の実施の形態】この発明の画像形成装置は、光導
電体を表面に塗布した導体からなる円筒状ドラムと円筒
状ドラム両端に取り付けられたフランジとからなる感光
体ドラムのフランジを円筒状ドラムの端部にある外部フ
レ−ムと円筒状ドラムの内部にある内部フレ−ムとを有
する中空の円柱状に形成する。そして、各フランジの内
部フレ−ムで軸に支持させ、感光体ドラムの全長より短
い距離で感光体ドラムを支持する。このフランジの全長
を適当に定めて、感光体ドラムの固有振動数ｆｄが、感
光体ドラム周辺に存在する駆動源より発生する加振周波
数ｆｇを超えるようにし、駆動機構の振動による感光体
ドラムの共振周波数を高めて、感光体ドラムの書込位置
精度を高める。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An image forming apparatus according to the present invention has a cylindrical photosensitive drum composed of a conductor having a photoconductor coated on its surface and flanges attached to both ends of the cylindrical drum. It is formed as a hollow cylinder having an outer frame at the end of the drum and an inner frame inside the cylindrical drum. The shaft is supported by the inner frame of each flange, and the photosensitive drum is supported at a distance shorter than the entire length of the photosensitive drum. By appropriately determining the overall length of the flange, the natural frequency fd of the photosensitive drum is set to exceed the excitation frequency fg generated by a drive source existing around the photosensitive drum, and the photosensitive drum is driven by the vibration of the drive mechanism. The resonance frequency is increased to increase the writing position accuracy of the photosensitive drum.
【００１８】また、上記円筒状ドラムの内壁に沿って複
数の棒状部材を均等に配分して取り付けることにより、
感光体ドラムの剛性を簡単に上げることができ、感光体
ドラムの固有振動数ｆｄを適宜設定できる。Further, by distributing a plurality of rod-shaped members evenly along the inner wall of the cylindrical drum and mounting the same,
The rigidity of the photosensitive drum can be easily increased, and the natural frequency fd of the photosensitive drum can be set appropriately.
【００１９】さらに、上記円筒状ドラムの内壁に、長手
方向に沿った複数の凸部を設けたり、円筒状ドラムの内
壁に、内径に沿った凸部を一定ピッチで設けたり、円筒
状ドラムの厚さを、長手方向の中心にいくにしたがって
連続的に厚くなるように形成し、円筒状ドラム自体の剛
性を高めるようにして良い。Further, a plurality of protrusions along the longitudinal direction are provided on the inner wall of the cylindrical drum, or a plurality of protrusions along the inner diameter are provided at a constant pitch on the inner wall of the cylindrical drum. The thickness may be formed so as to increase continuously toward the center in the longitudinal direction so as to increase the rigidity of the cylindrical drum itself.
【００２０】また、上記円筒状ドラムの内部に、中心か
ら内壁に向かう放射状のリブを設けて感光体ドラムの剛
性を高めても、感光体ドラムの固有振動数ｆｄが、感光
体ドラム周辺に存在する駆動源より発生する加振周波数
ｆｇを超えるように設定できる。また、円筒状ドラムの
厚さを薄くしても半径方向に対し強度を増すこともでき
る。Further, even if a radial rib extending from the center to the inner wall is provided inside the cylindrical drum to increase the rigidity of the photosensitive drum, the natural frequency fd of the photosensitive drum remains around the photosensitive drum. It can be set to exceed the excitation frequency fg generated from the driving source. Further, even if the thickness of the cylindrical drum is reduced, the strength can be increased in the radial direction.
【００２１】さらに、上記感光体ドラムの固有振動数ｆ
ｄを、感光体ドラム周辺に存在する駆動源より発生する
加振周波数ｆｇを超えるようにするとともに、感光体ド
ラムの固有振動数ｆｄを、感光体ドラムに残留したトナ
−を除去するクリ−ニング装置のクリ−ビングブレ−ド
と感光体ドラム表面の間に生じるスティックスリップの
振動数ｆｓに対して、ｆｓ／√２＜ｆｄ＜√２ｆｓの範
囲外に設定して、スティックスリップの振動による共振
を防ぐ。Further, the natural frequency f of the photosensitive drum
d is set to exceed an excitation frequency fg generated by a drive source existing around the photosensitive drum, and the natural frequency fd of the photosensitive drum is reduced to remove toner remaining on the photosensitive drum. The resonance frequency caused by the stick-slip vibration is set outside the range of fs / √2 <fd <√2fs with respect to the stick-slip vibration frequency fs generated between the cleaning blade of the apparatus and the surface of the photosensitive drum. prevent.
【００２２】[0022]
【実施例】図１はこの発明の一実施例の電子写真複写機
の画像形成部の構成図である。図に示すように、画像形
成部は感光体ドラム１と、感光体ドラム１の周囲に回転
方向に沿って配置された帯電ユニット２と露光ユニット
３，現像ユニット４，転写ユニット５，剥離ユニット６
及びクリ−ニングユニット７を有する。そして帯電ユニ
ット２で帯電した感光体ドラム１を露光ユニット３で露
光して静電潜像を形成し、形成した静電潜像に現像ユニ
ット４でトナ−を付着させてトナ−像を形成する。形成
したトナ−像を転写ユニット５でレジストロ−ラ８によ
って搬送される記録紙に転写し、トナ−像を転写した記
録紙を剥離ユニット６で感光体ドラム１から剥離して紙
搬送ユニット９で定着ユニット（不図示）に送り定着す
る。一方、感光体ドラム１に残留したトナ−をクリ−ニ
ングユニット７のクリ−ニングブレ−ド７１で掻き落し
て除去する。FIG. 1 is a block diagram of an image forming section of an electrophotographic copying machine according to one embodiment of the present invention. As shown in the figure, the image forming unit includes a photosensitive drum 1, a charging unit 2, an exposure unit 3, a developing unit 4, a transfer unit 5, and a peeling unit 6, which are arranged around the photosensitive drum 1 along the rotation direction.
And a cleaning unit 7. The photosensitive drum 1 charged by the charging unit 2 is exposed by the exposure unit 3 to form an electrostatic latent image, and toner is adhered to the formed electrostatic latent image by the developing unit 4 to form a toner image. . The formed toner image is transferred to the recording paper conveyed by the registration roller 8 by the transfer unit 5, and the recording paper on which the toner image has been transferred is peeled off from the photosensitive drum 1 by the peeling unit 6 and the paper transport unit 9. The sheet is sent to a fixing unit (not shown) to be fixed. On the other hand, the toner remaining on the photosensitive drum 1 is scraped off by a cleaning blade 71 of the cleaning unit 7 and removed.
【００２３】感光体ドラム１は、図２の断面図に示すよ
うに、外周面に光導電体が塗布されたアルミニウムなど
の導体で形成された円筒状ドラム１１と、円筒状ドラム
１１の両端に取り付けられたフランジ１２を有し、ドラ
ムモ−タやギヤ等を有する駆動機構部（不図示）により
回転する。この感光体ドラム１を回転するときに、感光
体ドラム１はドラムモ−タ等の駆動機構部の振動が加え
られ、ドラムモ−タ等から加えられる振動の周期と感光
体ドラム１の固有振動の周期が等しいときに共振する。
このように感光体ドラム１が外力により共振すると、感
光体ドラム１の回転速度に変動が生じ、感光体ドラム１
の書込位置精度が悪くなり、形成される画像の画質が劣
化してしまう。As shown in the sectional view of FIG. 2, the photosensitive drum 1 has a cylindrical drum 11 made of a conductor such as aluminum coated with a photoconductor on the outer peripheral surface thereof, and has a drum at both ends thereof. It has an attached flange 12 and is rotated by a drive mechanism (not shown) having a drum motor, gears and the like. When the photosensitive drum 1 is rotated, vibration of a driving mechanism such as a drum motor is applied to the photosensitive drum 1, and the period of the vibration applied from the drum motor and the period of the natural vibration of the photosensitive drum 1 are applied. Resonates when are equal.
When the photosensitive drum 1 resonates due to the external force in this manner, the rotation speed of the photosensitive drum 1 fluctuates, and the photosensitive drum 1
The writing position accuracy of the image becomes poor, and the image quality of the formed image deteriorates.
【００２４】一般に画像の可視感度と空間周波数の関係
は、人間の視覚系の特性からレ−ザにより書き込まれる
１ライン毎の空間周波数が0.2〜２ラインペア／ｍｍの
範囲で濃度変化をした場合に目につき易いといわれてい
る。感光体ドラム１が約300Ｈｚ以下で共振して速度変
動が生じた場合には、書き込みによる空間周波数が前記
範囲に該当するため、画質の低下としてとらえられる。
そこで、感光体ドラム１の剛性を適当に定めて、感光体
ドラム１の１次の固有振動数ｆｄが感光体ドラム１の駆
動機構部より発生する加振周波数ｆｇ、例えば300Ｈｚ
を超えるようにする。In general, the relationship between the visual sensitivity of an image and the spatial frequency is determined by the characteristics of the human visual system when the spatial frequency of each line written by a laser changes in density within the range of 0.2 to 2 line pairs / mm. It is said to be easily noticeable. When the photosensitive drum 1 resonates at about 300 Hz or less and causes a speed fluctuation, the spatial frequency due to writing falls in the above range, and this is regarded as a decrease in image quality.
Therefore, the rigidity of the photosensitive drum 1 is appropriately determined, and the primary natural frequency fd of the photosensitive drum 1 is changed to the excitation frequency fg generated from the drive mechanism of the photosensitive drum 1, for example, 300 Hz.
To exceed.
【００２５】すなわち、図２に示すように、円筒状ドラ
ム１１の両端に取り付けたフランジ１２を中空の円柱状
に形成し、各フランジ１２の円筒状ドラム１１の端部に
ある外部フレ−ム１２１と円筒状ドラム１１の内部にあ
る内部フレ−ム１２２の２個所で軸１３に支持させる。
このように感光体ドラム１の全長Ｌより短い距離Ｌ1で
感光体ドラム１を支持することにより、感光体ドラム１
の固有振動数ｆｄを高くすることができる。このフラン
ジ１２の全長Ｌ2は、感光体ドラム１の固有振動数ｆｄ
が、感光体ドラム１の駆動機構部より発生する加振周波
数ｆｇを超えるように感光体１の全長Ｌと外径Ｄ及び円
筒状ドラム１１の厚さｔに応じて定めれば良い。That is, as shown in FIG. 2, the flanges 12 attached to both ends of the cylindrical drum 11 are formed in a hollow cylindrical shape, and the outer frames 121 at the end of the cylindrical drum 11 of each flange 12 are formed. And the inner frame 122 inside the cylindrical drum 11 is supported on the shaft 13 at two points.
By supporting the photosensitive drum 1 in this manner photosensitive drum short distance L 1 from the total length L of 1, the photosensitive drum 1
Can have a high natural frequency fd. The total length L 2 of the flange 12 is equal to the natural frequency fd of the photosensitive drum 1.
May be determined according to the overall length L and the outer diameter D of the photoconductor 1 and the thickness t of the cylindrical drum 11 so as to exceed the vibration frequency fg generated by the drive mechanism of the photoconductor drum 1.
【００２６】このようにして、感光体ドラム１に外力に
よる振動が加えられても、良質な画像形成に必要な周波
数帯では感光体ドラム１に共振が生じないから、良質な
画像を形成することができる。In this way, even if vibration is applied to the photosensitive drum 1 by an external force, resonance does not occur in the photosensitive drum 1 in a frequency band necessary for high quality image formation. Can be.
【００２７】なお、フランジ１２の内部フレ−ム１２２
は感光体１の全長Ｌに応じて複数設けても良い。The inner frame 122 of the flange 12
May be provided in accordance with the total length L of the photoconductor 1.
【００２８】上記実施例はフランジ１２を外部フレ−ム
１２１と内部フレ−ム１２２を有する中空の円柱状に形
成し、円筒状ドラム１１の中空部の長さＬ2を短くして
感光体ドラム１の固有振動数ｆｄを高めた場合について
説明したが、図３の断面図と図４のＡ−Ａ断面図に示す
ように、剛性を有するフェノ−ル樹脂やエポキシ樹脂，
硬質のＡＢＳ樹脂，ポリアミド樹脂，ポリカ−ボネ−ト
等の合成樹脂や金属で形成された複数の棒状部材１４を
円筒状ドラム１１の内壁に沿って均等に配分して取り付
けて、感光体ドラム１の剛性を上げるようにしても良
い。この場合も、棒状部材１４の大きさと本数を感光体
ドラム１の固有振動数ｆｄが、感光体ドラム１の駆動機
構部より発生する加振周波数ｆｇを超えるように、感光
体１の全長Ｌと外径Ｄ及び円筒状ドラム１１の厚さｔに
応じて定めれば良い。[0028] The above embodiment the flange 12 external frame - arm 121 and the inner frame - is formed in a hollow cylindrical shape having an arm 122, a hollow portion of the length L 2 of the short to the photosensitive drum of the cylindrical drum 11 1, the case where the natural frequency fd is increased has been described. However, as shown in the sectional view of FIG. 3 and the sectional view taken along the line AA of FIG. 4, a rigid phenol resin or epoxy resin,
A plurality of rod members 14 made of a synthetic resin such as a hard ABS resin, a polyamide resin, or a polycarbonate, or a metal are uniformly distributed along the inner wall of the cylindrical drum 11 and attached. May be increased. Also in this case, the size and the number of the rod-shaped members 14 are set to be equal to the total length L of the photoconductor 1 so that the natural frequency fd of the photoconductor drum 1 exceeds the vibration frequency fg generated from the drive mechanism of the photoconductor drum 1. It may be determined according to the outer diameter D and the thickness t of the cylindrical drum 11.
【００２９】上記第２の実施例は円筒状ドラム１１の内
壁に沿って複数の棒状部材１４を取り付けて感光体ドラ
ム１の剛性を高め、感光体ドラム１の固有振動数ｆｄ
が、感光体ドラム１の駆動機構部より発生する加振周波
数ｆｇを超えるようにした場合について説明したが、図
５の断面図に示すように、円筒状ドラム１１の内壁に、
長手方向に沿った複数の凸部１５を設けたり、図６の断
面図に示すように、円筒状ドラム１１の内壁に、内径に
沿った凸部１６を一定ピッチで設けて円筒状ドラム１１
自体の剛性を高めるようにしても良い。この場合も、凸
部１５や凸部１６の高さとピッチを感光体ドラム１の固
有振動数ｆｄが、感光体ドラム１の駆動機構部より発生
する加振周波数ｆｇを超えるように、感光体１の全長Ｌ
と外径Ｄ及び円筒状ドラム１１の厚さｔに応じて定めれ
ば良い。In the second embodiment, the rigidity of the photosensitive drum 1 is increased by attaching a plurality of rod members 14 along the inner wall of the cylindrical drum 11 and the natural frequency fd of the photosensitive drum 1 is increased.
However, the case where the vibration frequency fg generated from the drive mechanism of the photosensitive drum 1 is set to be exceeded has been described, but as shown in the cross-sectional view of FIG.
A plurality of protrusions 15 are provided along the longitudinal direction, and as shown in the sectional view of FIG. 6, protrusions 16 along the inner diameter are provided on the inner wall of the cylindrical drum 11 at a constant pitch.
You may make it increase the rigidity of itself. Also in this case, the height and pitch of the protrusions 15 and 16 are adjusted so that the natural frequency fd of the photosensitive drum 1 exceeds the excitation frequency fg generated by the drive mechanism of the photosensitive drum 1. Total length L
And the outer diameter D and the thickness t of the cylindrical drum 11.
【００３０】また、上記実施例は円筒状ドラム１１の内
壁に凸部１５や凸部１６を設けて円筒状ドラム１１自体
の剛性を高めようにした場合について説明したが、図７
の断面図に示すように、円筒状ドラム１１の厚さｔを、
長手方向の中心にいくにしたがって連続的に厚くなるよ
うに形成して、円筒状ドラム１１自体の剛性を高めよう
にしても良い。この場合は、円筒状ドラム１１の厚さｔ
を連続的に変化させて振動モ−ドの発生しやすい中心部
を最も厚くすることにより、感光体ドラム１の固有振動
数ｆｄを高めることができるとともに部分的に応力が集
中することを防ぐことができる。In the above embodiment, the case where the protrusions 15 and 16 are provided on the inner wall of the cylindrical drum 11 to increase the rigidity of the cylindrical drum 11 itself has been described.
As shown in the cross-sectional view of FIG.
The rigidity of the cylindrical drum 11 itself may be increased by forming the cylindrical drum 11 to be continuously thicker toward the center in the longitudinal direction. In this case, the thickness t of the cylindrical drum 11
Is continuously changed to make the central portion where the vibration mode is likely to occur thickest, so that the natural frequency fd of the photosensitive drum 1 can be increased and stress is partially prevented from being concentrated. Can be.
【００３１】また、図８の断面図に示すように、円筒状
ドラム１１の内部に、合成樹脂や金属材料からなり、中
心から内壁に向かう放射状のリブ１７を設けて、感光体
ドラム１の剛性を高めて固有振動数ｆｄが、感光体ドラ
ム１の駆動機構部より発生する加振周波数ｆｇを超える
ようにしても良い。このように円筒状ドラム１１の内部
に放射状のリブ１７を設けると、円筒状ドラム１１の厚
さを薄くしても半径方向につぶれるモ−ドに対し強度が
増すこともできる。この点からも放射状のリブ１７の本
数は多い方が好ましい。また、放射状のリブ１７の材料
を変えることにより、感光体ドラム１の固有振動数ｆｄ
を変化させることもでき、比重の大きな金属材料を用い
ることにより、感光体ドラム１の固有振動数ｆｄをより
高い周波数帯域にシフトさせることもできる。As shown in the cross-sectional view of FIG. 8, a radial rib 17 made of a synthetic resin or a metal material and extending from the center toward the inner wall is provided inside the cylindrical drum 11 so that the rigidity of the photosensitive drum 1 can be improved. May be increased so that the natural frequency fd exceeds the vibration frequency fg generated by the drive mechanism of the photosensitive drum 1. When the radial ribs 17 are provided inside the cylindrical drum 11 in this manner, even if the thickness of the cylindrical drum 11 is reduced, the strength against the mode in which the cylindrical drum 11 is collapsed in the radial direction can be increased. From this point, it is preferable that the number of radial ribs 17 is large. Further, by changing the material of the radial ribs 17, the natural frequency fd of the photosensitive drum 1 is changed.
Can be changed, and by using a metal material having a large specific gravity, the natural frequency fd of the photosensitive drum 1 can be shifted to a higher frequency band.
【００３２】上記各実施例に示すように感光体ドラム１
の剛性を適当に定めて感光体ドラム１の固有振動数ｆｄ
が、感光体ドラム１の駆動機構部より発生する加振周波
数ｆｇを超えるようにしても、感光体ドラム１に残留し
たトナ−をクリ−ニングユニット７で除去するときに、
感光体ドラム１の表面とクリ−ニングユニット７のクリ
−ビングブレ−ド７１との間に生じるスティックスリッ
プ、すなわち滑らかでない引っかかったようなビビリと
いう振動を伴う摩擦現象により感光体ドラム１に共振が
生じると、感光体ドラム１の書込精度が悪くなり画質の
低下を招く。スティックスリップで発生する振動数をｆ
ｓとすると、図９の加振振動数ｆｓ／固有振動数ｆｄと
振動伝達率の特性図に示すように、感光体ドラム１の固
有振動数ｆｄがｆｓ／√２＜ｆｄ＜√２ｆｓの範囲のと
きに、スティックスリップの振動により感光体ドラム１
が共振して大きな振幅で振動する。As shown in the above embodiments, the photosensitive drum 1
The natural frequency fd of the photosensitive drum 1 is determined by appropriately setting the rigidity of the photosensitive drum 1.
However, even when the vibration frequency fg generated by the drive mechanism of the photosensitive drum 1 is exceeded, when the toner remaining on the photosensitive drum 1 is removed by the cleaning unit 7,
Resonance occurs in the photosensitive drum 1 due to a stick-slip generated between the surface of the photosensitive drum 1 and the cleaning blade 71 of the cleaning unit 7, that is, a frictional phenomenon accompanied by vibrations such as unsteady chattering. In this case, the writing accuracy of the photosensitive drum 1 is deteriorated, and the image quality is reduced. The frequency generated by stick-slip is f
As shown in FIG. 9, the characteristic frequency fd of the photosensitive drum 1 is in the range of fs / √2 <fd <√2fs, as shown in the characteristic diagram of the vibration frequency fs / the natural frequency fd and the vibration transmissibility in FIG. In this case, the photosensitive drum 1
Resonate and oscillate with a large amplitude.
【００３３】そこで、上記各実施例に示すように感光体
ドラム１の剛性を適当に定めて、感光体ドラム１の固有
振動数ｆｄが、感光体ドラム１の駆動機構部より発生す
る加振周波数ｆｇを超えるようにするときに、感光体ド
ラム１の固有振動数ｆｄがスティックスリップで発生す
る振動数ｆｓに対してｆｓ／√２＜ｆｄ＜√２ｆｓの範
囲外になるように設定する。このように感光体ドラム１
の固有振動数ｆｄを設定することにより、スティックス
リップの振動との共振を避けることができ、形成する画
像の高画質化と低騒音化を図ることができる。Therefore, as shown in each of the above embodiments, the rigidity of the photosensitive drum 1 is appropriately determined, and the natural frequency fd of the photosensitive drum 1 is changed to the excitation frequency generated by the drive mechanism of the photosensitive drum 1. When the frequency fg exceeds fg, the natural frequency fd of the photosensitive drum 1 is set so as to be out of the range of fs / √2 <fd <√2fs with respect to the frequency fs generated by stick-slip. Thus, the photosensitive drum 1
By setting the natural frequency fd, resonance with stick-slip vibration can be avoided, and high quality and low noise of an image to be formed can be achieved.
【００３４】[0034]
【発明の効果】この発明は以上説明したように、光導電
体を表面に塗布した導体からなる円筒状ドラムと円筒状
ドラム両端に取り付けられたフランジとからなる感光体
ドラムの固有振動数ｆｄが、感光体ドラムの駆動機構部
より発生する加振周波数ｆｇを超えるように円筒状ドラ
ムの剛性を定め、画像書込に影響する周波数帯域では感
光体ドラムを共振させないようにしたから、感光体ドラ
ムの書込位置精度を高めることができ、高画質の画像を
形成することができる。As described above, according to the present invention, the natural frequency fd of the photosensitive drum composed of the cylindrical drum made of the conductor coated with the photoconductor on the surface and the flanges attached to both ends of the cylindrical drum is reduced. The rigidity of the cylindrical drum is determined so as to exceed the excitation frequency fg generated by the drive mechanism of the photosensitive drum, and the photosensitive drum is prevented from resonating in a frequency band that affects image writing. The writing position accuracy can be improved, and a high-quality image can be formed.
【００３５】また、感光体ドラムのフランジを円筒状ド
ラムの端部にある外部フレ−ムと円筒状ドラムの内部に
ある内部フレ−ムとを有する中空の円柱状に形成し、各
フランジの内部フレ−ムで軸に支持させ、感光体ドラム
の全長より短い距離で感光体ドラムを支持するようにし
て、簡単な構成で感光体ドラムの固有振動数ｆｄを感光
体ドラムの駆動機構部より発生する加振周波数ｆｇより
高くすることができる。The flange of the photosensitive drum is formed in a hollow cylindrical shape having an outer frame at an end of the cylindrical drum and an inner frame inside the cylindrical drum. A frame is supported on a shaft, and the photosensitive drum is supported at a distance shorter than the entire length of the photosensitive drum. With a simple structure, the natural frequency fd of the photosensitive drum is generated from the drive mechanism of the photosensitive drum. To be higher than the excitation frequency fg.
【００３６】また、上記円筒状ドラムの内壁に沿って複
数の棒状部材を均等に配分して取り付けることにより、
感光体ドラムの剛性を簡単に上げることができ、感光体
ドラムの固有振動数ｆｄを適宜設定できる。Further, by distributing a plurality of rod-shaped members evenly along the inner wall of the cylindrical drum and mounting the rod-shaped members,
The rigidity of the photosensitive drum can be easily increased, and the natural frequency fd of the photosensitive drum can be set appropriately.
【００３７】さらに、上記円筒状ドラムの内壁に、長手
方向に沿った複数の凸部を設けたり、円筒状ドラムの内
壁に、内径に沿った凸部を一定ピッチで設けたり、円筒
状ドラムの厚さを、長手方向の中心にいくにしたがって
連続的に厚くなるように形成することにより、円筒状ド
ラム自体の剛性を高めることができるとともに感光体ド
ラムに部分的に応力が集中することを防ぐことができ
る。Further, a plurality of convex portions along the longitudinal direction are provided on the inner wall of the cylindrical drum, or convex portions along the inner diameter are provided at a constant pitch on the inner wall of the cylindrical drum. By forming the thickness so as to increase continuously toward the center in the longitudinal direction, the rigidity of the cylindrical drum itself can be increased, and stress is prevented from being partially concentrated on the photosensitive drum. be able to.
【００３８】また、上記円筒状ドラムの内部に、中心か
ら内壁に向かう放射状のリブを設けることにより、簡単
に感光体ドラムの剛性を高めて感光体ドラムの固有振動
数ｆｄを感光体ドラムの駆動機構部より発生する加振周
波数ｆｇより高く設定できるとともに円筒状ドラムの厚
さを薄くしても半径方向に対し強度を増すこともでき、
高画質の画像を安定して形成することができる。Further, by providing radial ribs extending from the center toward the inner wall inside the cylindrical drum, the rigidity of the photosensitive drum is easily increased, and the natural frequency fd of the photosensitive drum is increased. It can be set higher than the excitation frequency fg generated from the mechanism and can increase the strength in the radial direction even if the thickness of the cylindrical drum is reduced,
High-quality images can be formed stably.
【００３９】さらに、上記感光体ドラムの固有振動数ｆ
ｄを、感光体ドラムの駆動機構部より発生する加振周波
数ｆｇを超えるようにするとともに、感光体ドラムの固
有振動数ｆｄを、感光体ドラムに残留したトナ−を除去
するクリ−ニング装置のクリ−ビングブレ−ドと感光体
ドラム表面の間に生じるスティックスリップの振動数ｆ
ｓに対して、ｆｓ／√２＜ｆｄ＜√２ｆｓの範囲外に設
定することにより、スティックスリップの振動による共
振も防ぐことができ、画像の高画質化と低騒音化を図る
ことができる。Further, the natural frequency f of the photosensitive drum
d is set to exceed the vibration frequency fg generated by the drive mechanism of the photoconductor drum, and the natural frequency fd of the photoconductor drum is increased by a cleaning device for removing toner remaining on the photoconductor drum. Frequency f of stick slip generated between the cleaning blade and the surface of the photosensitive drum.
By setting s to be outside the range of fs / √2 <fd <共振 2fs, resonance due to stick-slip vibration can also be prevented, and high image quality and low noise can be achieved.
【図１】この発明の実施例の電子写真複写機の画像形成
部を示す構成図である。FIG. 1 is a configuration diagram illustrating an image forming unit of an electrophotographic copying machine according to an embodiment of the present invention.
【図２】上記実施例の感光体ドラムの構成を示す断面図
である。FIG. 2 is a cross-sectional view illustrating a configuration of a photosensitive drum of the embodiment.
【図３】第２の実施例の感光体ドラムの構成を示す断面
図である。FIG. 3 is a cross-sectional view illustrating a configuration of a photosensitive drum according to a second embodiment.
【図４】第２の実施例の感光体ドラムのＡ−Ａ断面図で
ある。FIG. 4 is a sectional view of the photosensitive drum according to a second embodiment, taken along the line AA.
【図５】第３の実施例の感光体ドラムの構成を示す断面
図である。FIG. 5 is a sectional view illustrating a configuration of a photosensitive drum according to a third embodiment.
【図６】第４の実施例の感光体ドラムの構成を示す断面
図である。FIG. 6 is a cross-sectional view illustrating a configuration of a photosensitive drum according to a fourth embodiment.
【図７】第５の実施例の感光体ドラムの構成を示す断面
図である。FIG. 7 is a sectional view illustrating a configuration of a photosensitive drum according to a fifth embodiment.
【図８】第６の実施例の感光体ドラムの構成を示す断面
図である。FIG. 8 is a sectional view illustrating a configuration of a photosensitive drum according to a sixth embodiment.
【図９】加振振動数ｆｓ／固有振動数ｆｄと振動伝達率
の特性図である。FIG. 9 is a characteristic diagram of an excitation frequency fs / a natural frequency fd and a vibration transmissibility.
１ 感光体ドラム ７ クリ−ニングユニット ７１ クリ−ニングブレ−ド １１ 円筒状ドラム １２ フランジ １２１ 外部フレ−ム １２１ 内部フレ−ム １３ 軸 １４ 棒状部材 １５ 凸部 １６ 凸部 １７ リブ DESCRIPTION OF SYMBOLS 1 Photoreceptor drum 7 Cleaning unit 71 Cleaning blade 11 Cylindrical drum 12 Flange 121 External frame 121 Internal frame 13 Shaft 14 Bar member 15 Convex part 16 Convex part 17 Rib
Claims (8)
円筒状ドラムと、円筒状ドラムの両端に取り付けられた
フランジとからなる感光体ドラムを有する画像形成装置
において、感光体ドラムの固有振動数ｆｄが、感光体ド
ラム周辺に存在する駆動源より発生する加振周波数ｆｇ
を超えるように円筒状ドラムの剛性を定めたことを特徴
とする画像形成装置。1. An image forming apparatus having a photosensitive drum including a cylindrical drum made of a conductor having a photoconductor coated on its surface and flanges attached to both ends of the cylindrical drum. The number fd is the vibration frequency fg generated from the drive source existing around the photosensitive drum.
An image forming apparatus wherein the rigidity of the cylindrical drum is determined so as to exceed the range.
る外部フレ−ムと円筒状ドラムの内部にある内部フレ−
ムとを有する中空の円柱状に形成し、内部フレ−ムで軸
に支持させ、感光体ドラムの全長より短い距離で感光体
ドラムを支持して感光体ドラムの剛性を上げる請求項１
記載の画像形成装置。2. An outer frame at an end of a cylindrical drum and an inner frame at an end of the cylindrical drum.
A hollow cylindrical member having an inner frame, the inner frame supporting the shaft, and supporting the photosensitive drum at a distance shorter than the entire length of the photosensitive drum to increase the rigidity of the photosensitive drum.
The image forming apparatus as described in the above.
棒状部材を均等に配分して取り付けて感光体ドラムの剛
性を上げる請求項１記載の画像形成装置。3. The image forming apparatus according to claim 1, wherein a plurality of rod-shaped members are evenly distributed and attached along the inner wall of said cylindrical drum to increase the rigidity of the photosensitive drum.
沿った複数の凸部を設けて感光体ドラムの剛性を上げる
請求項１記載の画像形成装置。4. The image forming apparatus according to claim 1, wherein a plurality of protrusions are provided on an inner wall of the cylindrical drum along a longitudinal direction to increase rigidity of the photosensitive drum.
た凸部を一定ピッチで設けて感光体ドラムの剛性を上げ
る請求項１記載の画像形成装置。5. The image forming apparatus according to claim 1, wherein convex portions along the inner diameter are provided on the inner wall of the cylindrical drum at a constant pitch to increase the rigidity of the photosensitive drum.
中心にいくにしたがって連続的に厚くなるように形成し
て感光体ドラムの剛性を上げる請求項１記載の画像形成
装置。6. The image forming apparatus according to claim 1, wherein the thickness of said cylindrical drum is formed so as to increase continuously toward the center in the longitudinal direction to increase the rigidity of the photosensitive drum.
壁に向かう放射状のリブを設けて、感光体ドラムの剛性
を上げる請求項１記載の画像形成装置。7. The image forming apparatus according to claim 1, wherein radial ribs extending from the center toward the inner wall are provided inside the cylindrical drum to increase the rigidity of the photosensitive drum.
円筒状ドラムと、円筒状ドラムの両端に取り付けられた
フランジとからなる感光体ドラムを有する画像形成装置
において、感光体ドラムの固有振動数ｆｄを、感光体ド
ラムに残留したトナ−を除去するクリ−ニング装置のク
リ−ビングブレ−ドと感光体ドラム表面の間に生じるス
ティックスリップの振動数ｆｓに対して、ｆｓ／√２＜
ｆｄ＜√２ｆｓの範囲外に設定することを特徴とする画
像形成装置。8. An image forming apparatus having a photosensitive drum comprising a cylindrical drum made of a conductor having a photoconductor coated on the surface thereof and flanges attached to both ends of the cylindrical drum, the natural vibration of the photosensitive drum The number fd is expressed as fs / √2 <, with respect to the frequency fs of the stick-slip generated between the cleaning blade of the cleaning device for removing the toner remaining on the photosensitive drum and the surface of the photosensitive drum.
An image forming apparatus, wherein fd <√2fs is set outside the range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9039737A JPH10222011A (en) | 1997-02-10 | 1997-02-10 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9039737A JPH10222011A (en) | 1997-02-10 | 1997-02-10 | Image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10222011A true JPH10222011A (en) | 1998-08-21 |
Family
ID=12561289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9039737A Pending JPH10222011A (en) | 1997-02-10 | 1997-02-10 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10222011A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007114606A (en) * | 2005-10-21 | 2007-05-10 | Ricoh Co Ltd | Cleaning device, process cartridge, image forming apparatus, and color image forming apparatus |
| JP2011039230A (en) * | 2009-08-10 | 2011-02-24 | Fuji Xerox Co Ltd | Developing device and image forming apparatus |
| WO2011030840A1 (en) * | 2009-09-11 | 2011-03-17 | 株式会社神戸製鋼所 | Photosensitive drum and vibration reduction method for same, and photosensitive drum unit |
| JP2012068460A (en) * | 2010-09-24 | 2012-04-05 | Fuji Xerox Co Ltd | Developing device, cartridge and image forming device |
| JP2012088687A (en) * | 2010-09-24 | 2012-05-10 | Canon Inc | Photosensitive drum and process cartridge |
-
1997
- 1997-02-10 JP JP9039737A patent/JPH10222011A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007114606A (en) * | 2005-10-21 | 2007-05-10 | Ricoh Co Ltd | Cleaning device, process cartridge, image forming apparatus, and color image forming apparatus |
| JP2011039230A (en) * | 2009-08-10 | 2011-02-24 | Fuji Xerox Co Ltd | Developing device and image forming apparatus |
| WO2011030840A1 (en) * | 2009-09-11 | 2011-03-17 | 株式会社神戸製鋼所 | Photosensitive drum and vibration reduction method for same, and photosensitive drum unit |
| JP2011059507A (en) * | 2009-09-11 | 2011-03-24 | Kobe Steel Ltd | Photoreceptor drum, method for reducing vibration of the same, and photoreceptor drum unit |
| US8787798B2 (en) | 2009-09-11 | 2014-07-22 | Kobe Steel, Ltd. | Photosensitive drum and vibration reduction method for same, and photosensitive drum unit |
| JP2012068460A (en) * | 2010-09-24 | 2012-04-05 | Fuji Xerox Co Ltd | Developing device, cartridge and image forming device |
| JP2012088687A (en) * | 2010-09-24 | 2012-05-10 | Canon Inc | Photosensitive drum and process cartridge |
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