JPH05127464A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPH05127464A JPH05127464A JP32097191A JP32097191A JPH05127464A JP H05127464 A JPH05127464 A JP H05127464A JP 32097191 A JP32097191 A JP 32097191A JP 32097191 A JP32097191 A JP 32097191A JP H05127464 A JPH05127464 A JP H05127464A
- Authority
- JP
- Japan
- Prior art keywords
- image head
- magnetic fluid
- photosensitive drum
- shaft
- shafts
- 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
- Dot-Matrix Printers And Others (AREA)
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
- Electrophotography Using Other Than Carlson'S Method (AREA)
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【発明の利用分野】この発明は光背面露光方式の画像形
成装置に関し、特に画像ヘッドの感光体に対する位置決
め、トナーや紙粉のヘッドへの侵入の防止、感光体とヘ
ッドに接続したシャフト間の気密封止に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical back exposure type image forming apparatus, and more particularly, to positioning of an image head with respect to a photoconductor, prevention of invasion of toner and paper dust into the head, and a space between the photoconductor and a shaft connected to the head. Regarding hermetic sealing.
【０００２】[0002]
【従来技術】特開昭５８−４４４４５号公報は、光背面
露光方式の基本原理を示している。そして光背面露光方
式では、画像形成装置の小型化や低価格化、低圧での帯
電による安全性の向上やオゾン発生の防止等の効果が得
られる。しかしながら光背面露光方式では、感光体の内
部に画像ヘッドを収容するため、画像ヘッドを感光体の
結像面（感光体膜）に正確に位置決めするのが困難とな
る。また画像ヘッドはトナーや紙粉等で汚染され、画像
ヘッドを感光体の内部に配置すると清掃が困難となる。
このため清掃無しで、画像ヘッドへの紙粉やトナーの付
着を防止できる機構が必要である。紙粉やトナー等の侵
入を防止するには、ヘッドと感光体との間を気密に封止
することが考えられるが、通常のボールベアリングでは
ベアリングの摩耗が問題となり、空気軸受けでは荷重支
承能力が不足し感光体を高精度に支承することができな
い。軸受けの摩耗は気密度の低下や位置精度の低下をも
たらし、画像品質の低下をもたらす。2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 58-44445 discloses the basic principle of an optical back exposure system. Further, the optical backside exposure system has effects such as miniaturization and cost reduction of the image forming apparatus, improvement of safety by charging at low voltage, and prevention of ozone generation. However, in the light back exposure method, since the image head is housed inside the photoconductor, it is difficult to accurately position the image head on the image forming surface (photoconductor film) of the photoconductor. Further, the image head is contaminated with toner, paper dust and the like, and if the image head is arranged inside the photoconductor, it becomes difficult to clean it.
Therefore, it is necessary to have a mechanism that can prevent paper dust and toner from adhering to the image head without cleaning. To prevent the invasion of paper powder, toner, etc., it is possible to hermetically seal between the head and the photoconductor, but with normal ball bearings bearing wear becomes a problem, and with air bearings the load bearing capacity Is insufficient to support the photoconductor with high precision. The wear of the bearing causes a decrease in airtightness and a decrease in positional accuracy, resulting in deterioration of image quality.
【０００３】[0003]
【発明の課題】この発明の課題は、(1) 画像ヘッドを
感光体に対して高精度に位置決めできるようにするとと
もに、(2) 画像ヘッドへのトナーや紙粉等の汚れの付
着を防止して清掃を不要にすることにある。この発明で
は上記(2)の課題のために、画像ヘッドにシャフトを接
続して、シャフトと感光体の間を気密に封止する。そし
てこの発明の他の課題は、(3) シャフトと感光体との
間の封止部の摩耗を防止し、高速で長時間感光体を回転
させても封止部が摩耗しないようにし、封止部の摩耗に
よる位置決め精度の低下や汚れの侵入を防止できるよう
にすることにある。An object of the present invention is to (1) enable highly accurate positioning of an image head with respect to a photoconductor, and (2) prevent adhesion of dirt such as toner or paper powder to the image head. To eliminate the need for cleaning. In order to solve the problem (2) of the present invention, the shaft is connected to the image head to hermetically seal between the shaft and the photoconductor. Another object of the present invention is to (3) prevent wear of the sealing portion between the shaft and the photosensitive member, prevent the sealing portion from being worn even when the photosensitive member is rotated at a high speed for a long time, and It is to prevent the positioning accuracy from being deteriorated and dirt from entering due to wear of the stopper.
【０００４】[0004]
【発明の構成】この発明は、感光体の内部に画像ヘッド
を配設し、光背面露光方式で該感光体を動作させるよう
にした画像形成装置において、前記画像ヘッドの両端に
シャフトを結合して、画像ヘッドを該シャフトに固定
し、該シャフトを感光体に対して位置決めすると共に、
該シャフトと感光体ドラムとの間を磁性流体で気密封止
したことを特徴とする。According to the present invention, in an image forming apparatus in which an image head is provided inside a photoconductor and the photoconductor is operated by a light back exposure method, shafts are connected to both ends of the image head. Fix the image head to the shaft, position the shaft with respect to the photoconductor, and
The shaft and the photosensitive drum are hermetically sealed with a magnetic fluid.
【０００５】ここに画像ヘッドとしては、実施例に示す
ＬＥＤ画像ヘッドの他に、液晶シャッタアレイ画像ヘッ
ド等を用いれば良い。好ましくはシャフトを画像ヘッド
のハウジングと一体成型し、ヘッドとシャフトとが最初
から位置決めされているようにする。このようなハウジ
ングの構造は複雑で、金属の押し出し等で成型するには
適さないので、好ましくはハウジングはエンジニアリン
グプラスチックで成型する。エンジニアリングプラスチ
ックでは導電性が不足し、帯電器からのノイズ等の静電
気から画像ヘッドを保護するのが不十分となる。また帯
電したトナーや紙粉の静電付着の防止も不十分となる。
そこで好ましくはハウジングを導電性のエンジニアリン
グプラスチックで製造し、例えばポリフェニレンサルフ
ァイドやポリカーボネート等のエンジニアリングプラス
チックに、金属粉末やグラファイト、炭素繊維等の導電
性粒子を混合して導電性を持たせると良い。磁性流体に
よる気密封止は、単に封止のためにのみ用いても良い
が、磁性流体封止は同時に軸受けとしても用いることが
できる。そして磁性流体軸受けは高速回転が可能で、摩
耗せず、長時間使用しても気密性が破られることがな
い。このため好ましくは、磁性流体封止を同時にシャフ
トと感光体間の軸受けとする。封止を破らずに、画像ヘ
ッドを外部に接続するために、好ましくはシャフトは中
空とし、中空のシャフトに画像ヘッドの信号線や電源線
を収容する。また例えばシャフトの中空部を、シャフト
の端部等で封止し、中空シャフトを介してのトナーや紙
粉の侵入を防止するのが好ましい。なおこの段落で示し
たものは、実施例の概要の説明であり、この発明の範囲
を限定するものではない。As the image head, a liquid crystal shutter array image head or the like may be used in addition to the LED image head shown in the embodiment. The shaft is preferably integrally molded with the housing of the imaging head so that the head and shaft are initially positioned. Since the structure of such a housing is complicated and not suitable for molding by metal extrusion or the like, the housing is preferably molded of engineering plastic. The engineering plastic lacks conductivity, and it becomes insufficient to protect the image head from static electricity such as noise from the charger. In addition, prevention of electrostatic adhesion of charged toner and paper powder is also insufficient.
Therefore, it is preferable that the housing is made of a conductive engineering plastic, and the conductive plastic such as polyphenylene sulfide or polycarbonate is mixed with conductive particles such as metal powder, graphite, or carbon fiber to give conductivity. The hermetic sealing with a magnetic fluid may be used merely for sealing, but the magnetic fluid sealing can also be used as a bearing at the same time. The magnetic fluid bearing can rotate at high speed, does not wear, and does not lose its airtightness even when used for a long time. For this reason, it is preferable that the magnetic fluid sealing is simultaneously used as a bearing between the shaft and the photoconductor. In order to connect the image head to the outside without breaking the seal, the shaft is preferably hollow, and the hollow shaft accommodates the signal line and the power line of the image head. Further, for example, it is preferable that the hollow portion of the shaft is sealed with the end portion of the shaft or the like to prevent the invasion of toner or paper powder through the hollow shaft. It should be noted that what is shown in this paragraph is an explanation of the outline of the embodiment and does not limit the scope of the present invention.
【０００６】[0006]
【発明の作用】この発明では、感光体とシャフトとの間
を磁性流体で気密に封止し、トナーや紙粉の侵入を防止
する。次に画像ヘッドをシャフトに対して位置決めし、
シャフトを感光体に位置決めすれば、画像ヘッドを精密
に感光体に対し位置決めすることができる。磁性流体に
よる封止は摩耗がなく、長時間使用しても、あるいは感
光体を高速回転させても摩耗せず、長期に渡って感光体
と画像ヘッドとの気密封止を保つことができる。According to the present invention, the space between the photosensitive member and the shaft is hermetically sealed with a magnetic fluid to prevent the intrusion of toner and paper powder. Then position the image head with respect to the shaft,
By positioning the shaft on the photoconductor, the image head can be accurately positioned on the photoconductor. Sealing with a magnetic fluid does not cause wear and does not wear even after long-term use or when the photoconductor is rotated at a high speed, and it is possible to maintain hermetic sealing between the photoconductor and the image head for a long time.
【０００７】[0007]
【実施例】図１において、２は感光体ドラムで、例えば
ガラス等の透明基体にａ−Ｓｉ等の感光体膜を成膜した
ものとする。４は画像ヘッドで、ここではＬＥＤ画像ヘ
ッドとし、液晶シャッタアレイ画像ヘッド等の他の画像
ヘッドでも良い。６，８は、画像ヘッド４に結合した一
対のシャフトである。１０，１０は感光体ドラム２の両
端部で、シャフト６，８との間に設けた磁性流体軸受け
である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 2 designates a photosensitive drum, which is formed by forming a photosensitive film such as a-Si on a transparent substrate such as glass. An image head 4 is an LED image head here, and may be another image head such as a liquid crystal shutter array image head. Reference numerals 6 and 8 are a pair of shafts connected to the image head 4. Reference numerals 10 and 10 denote magnetic fluid bearings provided between the shafts 6 and 8 at both ends of the photosensitive drum 2.
【０００８】図２に、磁性流体軸受けの構造を示す。図
において、１２はプラスチック等のカバー、１４は永久
磁石で、例えば感光体ドラム２の内周に沿ってリング状
に配置し、１６，１８は鉄等の磁性金属を用いたヨーク
で、ドラム２の内周に沿ってリング状に形成する。２０
は磁性流体で、例えば潤滑油に鉄粉やＣｏ粉、Ｎｉ粉等
の磁性粉体の微粒子を分散させたものである。磁性粉体
の粒径は、例えば１μｍ〜０．００１μｍ程度とする。
永久磁石１４の周囲に鉄等のヨーク１６，１８を設けて
閉磁路を構成し、磁性流体２０をヨーク１６，１８の間
に保持する。FIG. 2 shows the structure of the magnetic fluid bearing. In the figure, 12 is a cover made of plastic or the like, 14 is a permanent magnet, which is arranged in a ring shape along the inner circumference of the photosensitive drum 2, and 16 and 18 are yokes made of magnetic metal such as iron. It is formed in a ring shape along the inner circumference of. 20
Is a magnetic fluid, which is, for example, lubricating oil in which fine particles of magnetic powder such as iron powder, Co powder, and Ni powder are dispersed. The particle size of the magnetic powder is, for example, about 1 μm to 0.001 μm.
Yokes 16 and 18 made of iron or the like are provided around the permanent magnet 14 to form a closed magnetic circuit, and the magnetic fluid 20 is held between the yokes 16 and 18.
【０００９】磁性流体軸受け１０の配置は種々に変形す
ることができ、例えば図３の磁性流体軸受け３０のよう
に、感光体ドラム２と永久磁石１４の間に磁性流体２０
を配置しても良く、あるいは図４の磁性流体軸受け４０
のように、永久磁石１４の両側に磁性流体２０を配置し
ても良い。即ち磁性流体軸受け自体の構造は、任意であ
る。また磁性流体軸受け１０，３０，４０は、感光体ド
ラム２とシャフト６，８の間でなく、感光体ドラム２の
両端にはめ合わせたフランジとシャフト６，８との間に
設けても良い。しかしこの場合は、直接感光体ドラム２
に対し磁性流体軸受け１０，３０，４０で画像ヘッド４
を位置決めする場合に比べ、取り付け精度が低下する。The arrangement of the magnetic fluid bearing 10 can be variously modified. For example, like the magnetic fluid bearing 30 shown in FIG. 3, the magnetic fluid 20 is provided between the photosensitive drum 2 and the permanent magnet 14.
May be arranged, or the magnetic fluid bearing 40 of FIG.
As described above, the magnetic fluid 20 may be arranged on both sides of the permanent magnet 14. That is, the structure of the magnetic fluid bearing itself is arbitrary. Further, the magnetic fluid bearings 10, 30 and 40 may be provided not between the photoconductor drum 2 and the shafts 6 and 8, but between flanges fitted to both ends of the photoconductor drum 2 and the shafts 6 and 8. However, in this case, the direct photosensitive drum 2
In contrast to the magnetic fluid bearings 10, 30, 40, the image head 4
The mounting accuracy is lower than that in the case of positioning.
【００１０】磁性流体軸受け１０，３０，４０は、磁性
流体２０で荷重を支えるため摩耗せず、磁性流体２０の
密度が空気軸受けの場合の空気よりも大きいため、高荷
重を支えることができる。そこで磁性流体２０による封
止部をそのまま軸受けとして、感光体ドラム２の荷重の
支承や画像ヘッド４の位置決めに用いることが好まし
い。しかし図５，図６のように、別にボールベアリング
軸受けやスペーサーコロ等を設けて、これらのものを感
光体ドラム２の軸受けとすると共に、画像ヘッド４の位
置決めに用いても良い。図５において、５０はボールベ
アリング軸受けで、図６はボールベアリング軸受け５０
を感光体ドラム２の取り付けフランジ５２に結合した例
である。但し図６の変形例は、感光体ドラム２に対し直
接ボールベアリング軸受け５０を接触させる場合に比
べ、画像ヘッド４の位置決め精度が低下するので好まし
くはない。図５，図６の変形例では、磁性流体軸受け１
０，４０を気密封止にのみ用い、シャフト６，８の位置
決めによる画像ヘッド４の位置決めは、ボールベアリン
グ軸受け５０で行う。The magnetic fluid bearings 10, 30, 40 do not wear because they bear the load with the magnetic fluid 20, and since the density of the magnetic fluid 20 is larger than that of the air in the case of the air bearing, it can bear a high load. Therefore, it is preferable to use the sealed portion formed by the magnetic fluid 20 as it is as a bearing to support the load of the photosensitive drum 2 and to position the image head 4. However, as shown in FIGS. 5 and 6, it is also possible to separately provide a ball bearing bearing, a spacer roller, etc., and use these as the bearing of the photosensitive drum 2 and the positioning of the image head 4. In FIG. 5, 50 is a ball bearing bearing, and FIG. 6 is a ball bearing bearing 50.
In this example, is attached to the mounting flange 52 of the photosensitive drum 2. However, the modified example of FIG. 6 is not preferable because the positioning accuracy of the image head 4 is reduced as compared with the case where the ball bearing 50 is directly contacted with the photosensitive drum 2. In the modified examples of FIGS. 5 and 6, the magnetic fluid bearing 1
The ball bearings 50 are used to position the image head 4 by positioning the shafts 6 and 8 using 0 and 40 only for hermetic sealing.
【００１１】シャフト６，８と感光体ドラム２の間を磁
性流体軸受け１０等で気密に封止したので、画像ヘッド
４の信号線や電源線、アース線の取り出しが問題とな
る。そこで例えば図７のように、シャフト６，８を中空
として中空部５４を設け、ここに信号線等を結束してケ
ーブル５６として通し、シリコンゴム５８等で端部を封
止する。なお封止には、シリコンゴム５８の他に任意の
封止剤を用いることができ、また封止の位置はシャフト
６，８の端部に限らず任意である。シリコンゴム５８に
よる封止で、中空部５４を介してのトナーや紙粉の侵入
を防止する。Since the magnetic fluid bearing 10 or the like hermetically seals between the shafts 6 and 8 and the photosensitive drum 2, taking out the signal line, the power source line and the ground line of the image head 4 becomes a problem. Therefore, for example, as shown in FIG. 7, the shafts 6 and 8 are hollowed to provide a hollow portion 54, and the signal lines and the like are bundled therein and passed as a cable 56, and the ends are sealed with silicone rubber 58 or the like. For the sealing, any sealing agent other than the silicone rubber 58 can be used, and the sealing position is not limited to the ends of the shafts 6 and 8 and is arbitrary. The sealing with the silicone rubber 58 prevents the invasion of toner and paper powder through the hollow portion 54.
【００１２】図８に、画像ヘッド４の例を示す。図にお
いて、６０は画像ヘッドのハウジングで、シャフト６，
８と一体成型したものである。６２はセルフフォーカシ
ングレンズアレイ等のレンズアレイで、６４はＬＥＤア
レイ６６を搭載した基板、６８は基板６４の上下位置を
定めて搭載するための基準面で、例えば接着剤により基
板６４を固定する。７０はレンズアレイ６２の側面位置
を定めながらレンズアレイ６２を支承するための基準面
で、７２はレンズアレイ６２の底面を支えるための突起
である。突起７２の上面を面出しし、レンズアレイ６２
の底面位置を規定する。７４はステンレス等のカバーで
ある。FIG. 8 shows an example of the image head 4. In the figure, 60 is a housing of the image head, and the shaft 6,
It is molded integrally with 8. Reference numeral 62 is a lens array such as a self-focusing lens array, 64 is a substrate on which the LED array 66 is mounted, 68 is a reference plane for mounting the substrate 64 by determining its vertical position, and the substrate 64 is fixed by, for example, an adhesive. Reference numeral 70 is a reference surface for supporting the lens array 62 while determining the side surface position of the lens array 62, and 72 is a protrusion for supporting the bottom surface of the lens array 62. The upper surface of the protrusion 72 is chamfered, and the lens array 62
Specifies the bottom position of the. 74 is a cover made of stainless steel or the like.
【００１３】図８の画像ヘッド４では、ハウジング６０
の基準面６８，７０を直角に配置するので、図のｙ方向
にもｚ方向にも反りが生じ難い。このため基板６４やレ
ンズアレイ６２の反りを防止するとともに、ハウジング
６０自体の剛性を高め変形を防止することができる。In the image head 4 of FIG. 8, the housing 60
Since the reference planes 68 and 70 are arranged at a right angle, the warp is unlikely to occur in the y direction and the z direction in the figure. For this reason, it is possible to prevent the substrate 64 and the lens array 62 from warping, and increase the rigidity of the housing 60 itself to prevent deformation.
【００１４】次にＬＥＤアレイ６６の搭載に当たって
は、基板６４に図示しない導電性接着剤を塗布して置
き、ダイマウンタでＬＥＤアレイ６６の上面位置（発光
面の高さ）が揃うように加圧して導電性接着剤の厚さを
定めて、固定する。このことによって、ＬＥＤアレイ６
６の上面高さを揃えることができる。Next, when mounting the LED array 66, a conductive adhesive (not shown) is applied to the substrate 64 and placed, and the die mounter pressurizes the LED array 66 so that the upper surface positions (height of the light emitting surface) are aligned. Determine the thickness of the conductive adhesive and fix it. As a result, the LED array 6
The upper surface heights of 6 can be made uniform.
【００１５】実施例では、ハウジング６０とシャフト
６，８を一体成型したので、ハウジング６０に対して基
板６４やレンズアレイ６２を位置決めすれば、これらの
ものを直ちにシャフト６，８に対して位置決めできる。
しかし図８に示したように、これらを一体化したハウジ
ングの構造は複雑で、Ａｌ等の押し出し加工では一体成
型ができない。このためハウジング６０はエンジニアリ
ングプラスチック製とし、例えばポリフェニレンサルフ
ァイド（ＰＰＳ）やポリカーボネート（ＰＣ）等を用い
る。そしてエンジニアリングプラスチックを用いれば、
例えば射出成型でハウジング６０とシャフト６，８とを
安価に一体成型できる。ハウジング６０をエンジニアリ
ングプラスチック製とすると導電性が不足し、図示しな
い帯電器からのノイズに対するシールドや、紙粉やトナ
ー等の静電付着の防止が不完全となる。そこで好ましく
はハウジング６０の材質に、ステンレス粉末等の金属粉
末やグラファイト粒子、炭素繊維等の導電性粒子を混合
し、導電性を与える。なお図には示さなかったが、ハウ
ジング６０の両端の開口は、カバー７４を折り曲げる等
により密封しておくのが好ましい。In the embodiment, since the housing 60 and the shafts 6 and 8 are integrally molded, if the substrate 64 and the lens array 62 are positioned with respect to the housing 60, these can be immediately positioned with respect to the shafts 6 and 8. ..
However, as shown in FIG. 8, the structure of the housing in which these are integrated is complicated and cannot be integrally molded by extrusion of Al or the like. Therefore, the housing 60 is made of engineering plastic, for example, polyphenylene sulfide (PPS), polycarbonate (PC), or the like. And if you use engineering plastics,
For example, the housing 60 and the shafts 6 and 8 can be integrally molded at low cost by injection molding. If the housing 60 is made of engineering plastic, the conductivity is insufficient, and the shield against noise from a charger (not shown) and the electrostatic adhesion of paper powder, toner, etc. are incomplete. Therefore, preferably, the material of the housing 60 is mixed with metal powder such as stainless powder or conductive particles such as graphite particles or carbon fibers to give conductivity. Although not shown in the drawing, the openings at both ends of the housing 60 are preferably sealed by bending the cover 74 or the like.
【００１６】レンズアレイ６２にガラスレンズのアレイ
を用いる場合、ＣＯ2等と水分との反応で生じた炭酸
で、レンズアレイ６２の表面が侵され曇りが生じるとの
問題がある。このような曇りは簡単に拭き取ることがで
きるが、画像ヘッド４を感光体ドラム２の内部に配置し
たため拭き取りは難しい。そこで図９のように、レンズ
アレイ６２の表面をエポキシ樹脂やアクリル樹脂等の透
明樹脂７８で被覆し、防曇処理を行う。When a glass lens array is used as the lens array 62, there is a problem in that the surface of the lens array 62 is fogged by the carbonic acid produced by the reaction of CO2 or the like with moisture. Such fogging can be easily wiped off, but it is difficult to wipe it off because the image head 4 is arranged inside the photosensitive drum 2. Therefore, as shown in FIG. 9, the surface of the lens array 62 is covered with a transparent resin 78 such as an epoxy resin or an acrylic resin to perform antifogging treatment.
【００１７】好ましくは図１０のように、個別のレンズ
７６毎に透明樹脂７８の厚さを替え、個別のレンズ７６
毎の焦点調整を行う。Preferably, as shown in FIG. 10, the thickness of the transparent resin 78 is changed for each individual lens 76, and the individual lens 76 is changed.
Adjust the focus for each.
【００１８】実施例の作用を説明する。磁性流体軸受け
１０等は、気密でトナーや紙粉等の侵入を防止できる。
次に磁性流体軸受け１０等は流体軸受けで摩耗せず、磁
性流体２０は永久磁石１４の磁力で軸受け１０等の内部
に閉じ込められる。更に高密度の磁性流体１０を用いる
ため正確にシャフト６，８と感光体ドラム２の内周との
間隔を保ち、高速回転時にも狂いが生じないとの特徴が
ある。このため長期間に渡ってシャフト６，８と感光体
ドラム２との位置関係を保ち、かつ汚れの侵入を防止で
きる。The operation of the embodiment will be described. The magnetic fluid bearing 10 and the like are airtight and can prevent invasion of toner, paper dust, and the like.
Next, the magnetic fluid bearing 10 and the like are not worn by the fluid bearing, and the magnetic fluid 20 is confined inside the bearing 10 and the like by the magnetic force of the permanent magnet 14. Further, since the magnetic fluid 10 of high density is used, the distance between the shafts 6 and 8 and the inner circumference of the photosensitive drum 2 is accurately maintained, and the characteristic is that no deviation occurs even at high speed rotation. Therefore, it is possible to maintain the positional relationship between the shafts 6 and 8 and the photosensitive drum 2 for a long period of time, and prevent dirt from entering.
【００１９】図８に示したように、ハウジング６０とシ
ャフト６，８を一体成型したので、レンズアレイ６２や
基板６４は自動的にシャフト６，８に対して位置決めさ
れる。ここでハウジング６０に対する基板６４の位置は
基準面６８で定め、レンズアレイ６２の位置は基準面７
０で定め、基板６４に対するＬＥＤアレイ６６の高さの
ばらつきはダイマウント時に導電性接着剤の厚さを変え
ることで吸収した。またハウジング６０には、図８のｙ
方向にもｚ方向にも反りが生じ難い形状のものを用い
た。この結果、シャフト６，８を感光体ドラム２に対し
て位置決めすれば、自動的にレンズアレイ６２やＬＥＤ
アレイ６６を感光体ドラム２の結像面に対し位置決めで
きることになる。As shown in FIG. 8, since the housing 60 and the shafts 6 and 8 are integrally molded, the lens array 62 and the substrate 64 are automatically positioned with respect to the shafts 6 and 8. Here, the position of the substrate 64 with respect to the housing 60 is determined by the reference plane 68, and the position of the lens array 62 is determined by the reference plane 7.
The variation in the height of the LED array 66 with respect to the substrate 64 was absorbed by changing the thickness of the conductive adhesive during die mounting. In addition, the housing 60 has y in FIG.
A shape that is resistant to warpage in both the z direction and the z direction was used. As a result, when the shafts 6 and 8 are positioned with respect to the photosensitive drum 2, the lens array 62 and the LED are automatically
The array 66 can be positioned with respect to the image plane of the photosensitive drum 2.
【００２０】これらのことにより、画像ヘッド４を感光
体ドラム２に対し正確に位置決めし、焦点精度を向上さ
せると共に、トナーや紙粉の侵入を防止し、印画品質を
向上させることができる。しかも磁性流体軸受け１０等
は摩耗しないので、長期間印画品質を保つことができ
る。As a result, the image head 4 can be accurately positioned with respect to the photosensitive drum 2, the focus accuracy can be improved, and the intrusion of toner and paper dust can be prevented and the printing quality can be improved. Moreover, since the magnetic fluid bearing 10 and the like are not worn, the printing quality can be maintained for a long time.
【００２１】これらの他に、ハウジング６０をエンジニ
アリングプラスチック製とすることにより、シャフト
６，８を一体成型した複雑な形状のものを安価に量産す
ることができ、また導電性微粒子を混合することにより
静電ノイズをシールドし、トナーや紙粉等の静電付着も
防止できる。また気密封止だけでは解決できない、ＣＯ
2によるレンズアレイ６２の曇りの発生も、透明樹脂７
８で被覆することにより解消できる。In addition to these, by making the housing 60 made of engineering plastic, it is possible to mass-produce the complicated shape in which the shafts 6 and 8 are integrally molded at low cost, and by mixing the conductive fine particles. It can shield electrostatic noise and prevent electrostatic adhesion of toner and paper powder. Moreover, CO cannot be solved only by hermetic sealing.
Even if the lens array 62 becomes cloudy due to 2, the transparent resin 7
It can be solved by coating with 8.
【００２２】ここでは感光体ドラム２の内周に画像ヘッ
ドを配置したが、図１１に示すように、ＯＰＣフィルム
等の感光体８０の内部に画像ヘッドを配置しても良い。Although the image head is arranged on the inner circumference of the photosensitive drum 2 here, the image head may be arranged inside the photosensitive member 80 such as an OPC film as shown in FIG.
【００２３】[0023]
【発明の効果】この発明では、感光体とシャフトとの間
を磁性流体で気密に封止し、トナーや紙粉の侵入を防止
する。この結果、画像ヘッドの清掃無しで、長時間駆動
することができる。次に画像ヘッドをシャフトに対して
位置決めし、シャフトを感光体に位置決めすれば、画像
ヘッドを精密に感光体に対し位置決めすることができ
る。このため画像形成装置の位置精度を向上させること
ができる。磁性流体による封止は摩耗がなく、長時間使
用しても、あるいは感光体を高速回転させても摩耗せ
ず、長期に渡って感光体と画像ヘッドとの気密封止を保
つことができる。According to the present invention, the space between the photoconductor and the shaft is hermetically sealed with a magnetic fluid to prevent the intrusion of toner and paper dust. As a result, it is possible to drive for a long time without cleaning the image head. Next, by positioning the image head with respect to the shaft and the shaft with respect to the photoconductor, the image head can be accurately positioned with respect to the photoconductor. Therefore, the positional accuracy of the image forming apparatus can be improved. Sealing with a magnetic fluid does not cause wear and does not wear even after long-term use or when the photoconductor is rotated at a high speed, and it is possible to maintain hermetic sealing between the photoconductor and the image head for a long time.
【図１】 実施例の画像形成装置の端面図FIG. 1 is an end view of an image forming apparatus according to an embodiment.
【図２】 実施例の画像形成装置での、磁性流体軸受
けの配置を示す要部端面図FIG. 2 is an end view of a main part showing the arrangement of magnetic fluid bearings in the image forming apparatus according to the embodiment.
【図３】 他の実施例での、磁性流体軸受けの配置を
示す要部端面図FIG. 3 is an end view of a main part showing the arrangement of a magnetic fluid bearing according to another embodiment.
【図４】 更に他の実施例での、磁性流体軸受けの配
置を示す要部端面図FIG. 4 is an end view showing the arrangement of a magnetic fluid bearing according to still another embodiment.
【図５】 磁性流体をシャフトと感光体ドラム間の気
密封止のみに用いた、実施例の要部端面図FIG. 5 is an end view of a main part of an embodiment in which a magnetic fluid is used only for airtight sealing between a shaft and a photosensitive drum.
【図６】 磁性流体をシャフトと感光体ドラム間の気
密封止のみに用いた、他の実施例の要部端面図FIG. 6 is an end view of a main part of another embodiment in which a magnetic fluid is used only for hermetically sealing a shaft and a photosensitive drum.
【図７】 実施例での中空シャフトを示す部分断面図FIG. 7 is a partial sectional view showing a hollow shaft according to an embodiment.
【図８】 実施例での画像ヘッドの例を示す斜視図FIG. 8 is a perspective view showing an example of an image head in the embodiment.
【図９】 実施例でのガラスレンズアレイの防曇処理
を示す側面図FIG. 9 is a side view showing the antifogging treatment of the glass lens array in the example.
【図１０】 変形例でのガラスレンズアレイの防曇処理
を示す側面図FIG. 10 is a side view showing an antifog treatment of a glass lens array in a modified example.
【図１１】 ＯＰＣ感光体への実施例の適用を示す斜視
図FIG. 11 is a perspective view showing application of the embodiment to an OPC photosensitive member.
２ 感光体ドラム ４ 画像ヘッド ６，８ シャフト １０，３０，４０ 磁性流体軸受け １４ 永久磁石 １６，１８ ヨーク ２０ 磁性流体 2 photoconductor drum 4 image head 6,8 shaft 10, 30, 40 magnetic fluid bearing 14 permanent magnet 16, 18 yoke 20 magnetic fluid
Claims (1)
光背面露光方式で該感光体を動作させるようにした画像
形成装置において、 前記画像ヘッドの両端にシャフトを結合して、画像ヘッ
ドをシャフトに固定し、かつ、該シャフトを感光体に対
して位置決めすると共に、該シャフトと感光体ドラムと
の間を磁性流体で気密封止したことを特徴とする、画像
形成装置。1. An image head is provided inside a photoreceptor,
In an image forming apparatus in which the photoconductor is operated by a light back exposure method, a shaft is coupled to both ends of the image head, the image head is fixed to the shaft, and the shaft is positioned with respect to the photoconductor. In addition, the image forming apparatus is characterized in that a magnetic fluid is hermetically sealed between the shaft and the photosensitive drum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32097191A JP2805556B2 (en) | 1991-11-07 | 1991-11-07 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32097191A JP2805556B2 (en) | 1991-11-07 | 1991-11-07 | Image forming device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05127464A true JPH05127464A (en) | 1993-05-25 |
| JP2805556B2 JP2805556B2 (en) | 1998-09-30 |
Family
ID=18127346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32097191A Expired - Fee Related JP2805556B2 (en) | 1991-11-07 | 1991-11-07 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2805556B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7245313B2 (en) | 2003-12-16 | 2007-07-17 | Murata Kikai Kabushiki Kaisha | Image forming device |
| WO2008104469A1 (en) * | 2007-02-26 | 2008-09-04 | OCé PRINTING SYSTEMS GMBH | Device and method for sealing a shaft to prevent the penetration of a toner mixture |
| DE102009023322A1 (en) * | 2009-05-29 | 2010-12-02 | OCé PRINTING SYSTEMS GMBH | Apparatus for sealing a shaft to prevent penetration of particles, comprises an annular stationary sealing device disposed radially around the shaft at the distance of an annular gap, where the annular gap is applied with a magnetic field |
-
1991
- 1991-11-07 JP JP32097191A patent/JP2805556B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7245313B2 (en) | 2003-12-16 | 2007-07-17 | Murata Kikai Kabushiki Kaisha | Image forming device |
| US7397492B2 (en) | 2003-12-16 | 2008-07-08 | Murata Kikai Kabushiki Kaisha | Image forming device |
| US7414644B2 (en) | 2003-12-16 | 2008-08-19 | Murata Kikai Kabushiki Kaisha | Image forming device |
| WO2008104469A1 (en) * | 2007-02-26 | 2008-09-04 | OCé PRINTING SYSTEMS GMBH | Device and method for sealing a shaft to prevent the penetration of a toner mixture |
| US8224204B2 (en) | 2007-02-26 | 2012-07-17 | Oce Printing Systems Gmbh | Device and method for sealing a shaft to prevent the penetration of a toner mixture |
| DE102009023322A1 (en) * | 2009-05-29 | 2010-12-02 | OCé PRINTING SYSTEMS GMBH | Apparatus for sealing a shaft to prevent penetration of particles, comprises an annular stationary sealing device disposed radially around the shaft at the distance of an annular gap, where the annular gap is applied with a magnetic field |
| DE102009023322B4 (en) * | 2009-05-29 | 2011-06-09 | OCé PRINTING SYSTEMS GMBH | Device and method for sealing a shaft against the passage of particles |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2805556B2 (en) | 1998-09-30 |
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| LAPS | Cancellation because of no payment of annual fees |