JPS609792Y2 - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JPS609792Y2 JPS609792Y2 JP3939879U JP3939879U JPS609792Y2 JP S609792 Y2 JPS609792 Y2 JP S609792Y2 JP 3939879 U JP3939879 U JP 3939879U JP 3939879 U JP3939879 U JP 3939879U JP S609792 Y2 JPS609792 Y2 JP S609792Y2
- Authority
- JP
- Japan
- Prior art keywords
- photoreceptor
- image forming
- area
- light shielding
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Exposure Or Original Feeding In Electrophotography (AREA)
Description
【考案の詳細な説明】
本考案は電子写真感光部材に対するシャープカット用の
露光装置を備えた画像形成装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image forming apparatus equipped with an exposure device for sharp cutting on an electrophotographic photosensitive member.
詳しくは、感光部材の像形成領域とその周囲領域との境
をシャープに出すための露光装置を備えた像形成領域に
関する。Specifically, the present invention relates to an image forming area equipped with an exposure device for sharply creating a boundary between an image forming area of a photosensitive member and its surrounding area.
周知の如くドラム状感光体上に形成した現像をシート状
の転写材に転写する電子写真装置では、感光体に原稿に
対応した潜像を形成するとき、この感光体の潜像形成時
の前後に略々均一光を感光体面に露光し、感光体上に電
位が発生しないようにする。As is well known, in an electrophotographic device that transfers a developed image formed on a drum-shaped photoreceptor to a sheet-like transfer material, when forming a latent image corresponding to an original on the photoreceptor, there is a difference between before and after the latent image is formed on the photoreceptor. The surface of the photoreceptor is exposed to substantially uniform light to prevent potential from being generated on the photoreceptor.
このような露光を１ブランク露光ヨと称し、後の現像工
程時に不要な部分を現像しないように作用して、現像剤
の消費量を押え同時にクリーニング手段に対する負荷を
軽減させる。Such exposure is referred to as one blank exposure, and acts to prevent unnecessary portions from being developed during the subsequent development process, thereby reducing the amount of developer consumed and at the same time reducing the load on the cleaning means.
一方、感光体は実際には原稿像に対する静電潜像が形成
される像形成領域幅よりも両端が若干広く設定されるも
のである。On the other hand, the photoreceptor is actually set to be slightly wider at both ends than the width of the image forming area where the electrostatic latent image on the original image is formed.
そして、この像形成領域の側端側の外側にあたる境界領
域に対しても潜像形成手段や現像手段が作用するので、
所望潜像を形成した場合、上記境界領域は実質的に暗部
に相当するため、上記境界領域では画像両端で帯状に現
像剤が付着してしまう。Since the latent image forming means and the developing means also act on the boundary area on the outside of the side edge side of this image forming area,
When a desired latent image is formed, the boundary area substantially corresponds to a dark area, and therefore, the developer adheres in a band shape at both ends of the image in the boundary area.
この境界領域に付着した現像剤はクリーニング手段の負
担を大きくし、クリーニング手段の能力を落したり耐久
性を縮めたりする問題を生じる。The developer adhering to this boundary area increases the burden on the cleaning means, causing problems such as deterioration of the cleaning means' performance and shortening of its durability.
また転写部においては転写材が感光体に対して転写のた
めに接触せしめられ、これら転写材は次の分離工程で感
光体から分離される。Further, in the transfer section, transfer materials are brought into contact with the photoreceptor for transfer, and these transfer materials are separated from the photoreceptor in the next separation step.
この感光体から転写材を分離するために、上記感光体の
一端又は両端側の境界領域に爪状・ベルト状等の分離手
段が感光体に接触せしめられている場合には、上記境界
領域に付着したトナーがこの分離手段を汚染し、更にこ
の汚染が転写材を汚すという不都合をも生ずる。In order to separate the transfer material from the photoreceptor, if a separation means such as a claw or a belt is brought into contact with the photoreceptor at one or both ends of the photoreceptor, the separation means may be in contact with the photoreceptor. The adhering toner contaminates the separating means, and this contamination also contaminates the transfer material.
従って、上記のような境界領域における従来装置の欠点
を解決するには、上記ブランク露光の適用と共に、境界
領域をも均一光で露光し、感光体の画像形成領域の全周
囲領域を照明し、その全周囲領域の感光体表面電位を消
失させれば良い訳である。Therefore, in order to solve the above-mentioned drawbacks of the conventional apparatus in the boundary area, in addition to applying the blank exposure, the boundary area is also exposed with uniform light to illuminate the entire surrounding area of the image forming area of the photoreceptor, It is sufficient to eliminate the surface potential of the photoreceptor in the entire surrounding area.
上記の如き境界領域における均一露光を１シヤープカツ
ト露光ヨと称する。Uniform exposure in the boundary area as described above is called one sharp cut exposure.
本考案の目的は上記シャープカット露光の改良にあり、
感光体の像形成領域と境界領域との境を鮮明に出すこと
を目的とするものである。The purpose of this invention is to improve the sharp cut exposure described above.
The purpose of this is to clearly define the boundary between the image forming area and the boundary area of the photoreceptor.
上記目的を達成する本考案は、電子写真法を適用する感
光体と、この感光体の幅より狭い幅を有する像形成領域
に所望する静電潜像を形成するための潜像形成手段を有
する画像形成装置において、上記感光体の像形成領域の
側端側の境界領域に均一な光を露光する手段を有し、こ
の露光手段は感光体面上の位置により異なる距離をこの
感光体面間で形成する光源と、この感光体面と光源との
間に位置する遮光部材を有し、この遮光部材は上記像形
成領域と境界領域との境に対応する端部が、像形成領域
と境界領域との境界を通り感光体面に垂直な面と非平行
な端部になるように構威し、上記遮光部材で遮断され光
による上記遮光部材端部影を感光体上で上記境界に沿っ
て形成することにより行なう。To achieve the above object, the present invention includes a photoreceptor to which electrophotography is applied, and a latent image forming means for forming a desired electrostatic latent image in an image forming area having a width narrower than the width of the photoreceptor. The image forming apparatus includes means for exposing uniform light to a boundary area on the side edge side of the image forming area of the photoreceptor, and this exposure means forms a distance between the photoreceptor surfaces that varies depending on the position on the photoreceptor surface. and a light shielding member located between the photoreceptor surface and the light source, and the end of the light shielding member corresponding to the boundary between the image forming area and the boundary area is located between the image forming area and the boundary area. The edge of the light shielding member is configured such that the end portion passes through the boundary and is non-parallel to a plane perpendicular to the surface of the photoreceptor, and is blocked by the light shielding member, and a shadow of the end of the light shielding member is formed on the photoreceptor along the boundary. This is done by
上記本考案における光源とは原稿照明用のランプやシャ
ープカット専用のランプを使用すれば良く、遮光部材と
しては感光体の幅方向に連続したランプである場合は、
像領域を覆う遮光部材とし、またシャープカット専用の
ランプの場合は、所定位置を露光するだけのスリット状
のもので良い。The light source in the present invention may be a lamp for document illumination or a lamp exclusively for sharp cutting, and if the light shielding member is a continuous lamp in the width direction of the photoreceptor,
It is a light shielding member that covers the image area, and in the case of a lamp exclusively for sharp cutting, it may be a slit-shaped member that only exposes a predetermined position.
更に、両者の場合はブランク露ｐＮ、 ＯＦＦ用のシャ
ッタとしても活用でき、この例は実施例において説明す
る。Furthermore, in both cases, it can also be used as a shutter for blank exposure pN and OFF, and this example will be explained in the embodiment.
なお感光体の形状としてはドラム状・板状を含み、第１
図から第３図の如くシャープカット用の光源１から感光
体２までの距離が感光体上の位置により異なる装置であ
るならば、本考案の適用は可能で、図のものはスリット
露光による場合を示している。The shape of the photoreceptor includes a drum shape and a plate shape.
If the distance from the light source 1 for sharp cutting to the photoconductor 2 differs depending on the position on the photoconductor, the present invention can be applied to the device as shown in FIGS. It shows.
第４図は本考案の原理を示すものであり、図中３はドラ
ム状感光体、４は遮光板、５はシャープカット用の光源
を示す。FIG. 4 shows the principle of the present invention. In the figure, 3 indicates a drum-shaped photoreceptor, 4 indicates a light shielding plate, and 5 indicates a light source for sharp cutting.
図の場合の光源５は点光源とし、この光源５が感光体３
の軸と表面の母線を通り且つ図の如く遮光板４の端辺中
央部を通る垂直線上にあるときは、遮光板４の端辺部影
は図の如く感光体３の周面上で直線状に形成される。In the case of the figure, the light source 5 is a point light source, and this light source 5 is connected to the photoreceptor 3.
When it is on a vertical line that passes through the axis and the generatrix of the surface and also passes through the center of the edge of the light shielding plate 4 as shown in the figure, the edge shadow of the light shielding plate 4 is a straight line on the circumferential surface of the photoreceptor 3 as shown in the figure. formed into a shape.
即ち、感光体３表面の領域Ａが像形成部であり領域Ｂが
シャープカットのための境界領域とすれば、上記像領域
端部の画像を鮮明に形成することができる。That is, if area A on the surface of the photoreceptor 3 is used as an image forming area and area B is used as a boundary area for sharp cutting, it is possible to form a clear image at the edge of the image area.
これに対し第５図は、上記光源５の位置を同じ高さで感
光体３の回転軸方向に移動した場合の、上記遮光板４の
影の出来方を示したものである。On the other hand, FIG. 5 shows how the shadow of the light shielding plate 4 is formed when the position of the light source 5 is moved in the direction of the rotation axis of the photoreceptor 3 at the same height.
例えば光源５を境界Ｃの内側に移動した場合、遮光板４
の影は凸状になり、逆に外側に移動すると影は凹状とな
る。For example, if the light source 5 is moved inside the boundary C, the light shielding plate 4
The shadow becomes convex, and conversely when moving outward, the shadow becomes concave.
このような光源の位置で像形成領域にシャープカット露
光した場合、境界部の画像を消したり又は境界領域の端
部を現像することになる。If the image forming area is exposed to sharp cut light at such a light source position, the image at the boundary will be erased or the edge of the boundary area will be developed.
上記遮光板４の影の凹凸の発生は、感光体表面と遮光板
との距離が一定でないこと及び、光源が感光体３の軸と
遮光板を通る面内を通り且つ遮光板４の端部に垂直な位
置から外れることに起因する。The unevenness of the shadow of the light shielding plate 4 is caused by the fact that the distance between the surface of the photoreceptor and the light shielding plate is not constant, and also because the light source passes through the axis of the photoreceptor 3 and the light shielding plate, and the edge of the light shielding plate 4 This is caused by deviation from the perpendicular position.
そして、実際の装置のシャープカット用の光源としては
点光源では有り得ず実質的に発光部は一定の幅を有して
おり、光源を５の位置においた場合にも第５図の５ａ又
は５ｂの位置からも露光することになる。As a light source for sharp cutting in an actual device, a point light source cannot be used, and the light emitting part has a substantially constant width, so even if the light source is placed at position 5, 5a or 5b in It will also be exposed from the position.
本考案では上記点に鑑み、光源からの光を遮光する部材
の端部を上記境界を通る面とは非平行にこれを変形する
ことにより、上記問題を解決するものである。In view of the above point, the present invention solves the above problem by deforming the end portion of the member that blocks light from the light source so that it is non-parallel to the plane passing through the boundary.
即ち、例えば第５図の光源５ａの如きなる場合は、遮光
板の端部を第６図の一点鎖線で示す曲線に戒形腰更に光
源５ｂの場合は鎖線で示す如く遮光板を成形することに
より、シャープカット露光時の板４の影を第４図の状態
に補正するものである。That is, for example, in the case of the light source 5a in FIG. 5, the end of the light shielding plate should be shaped into the curve shown by the dashed line in FIG. This corrects the shadow of the plate 4 during sharp cut exposure to the state shown in FIG. 4.
次に実際の装置を例に本考案の実施例を第７図に従って
説明する。Next, an embodiment of the present invention will be described with reference to FIG. 7 using an actual device as an example.
図中６は電子写真用感光体で、本件出願人による特公昭
４２−２３９１０号公報に開示のある導電基体、光導電
層、表面絶縁層より成るもので、７は１次コロナ放電器
、８は２次コロナ放電器、９は移動タイプの原稿載置台
（原稿台）、１０は功源で上記原稿台９及びブランク露
光とシャープカット露光用光源として使用される。In the figure, 6 is a photoreceptor for electrophotography, which is composed of a conductive substrate, a photoconductive layer, and a surface insulating layer, as disclosed in Japanese Patent Publication No. 42-23910 by the applicant, 7 is a primary corona discharger, and 8 is a photoreceptor for electrophotography. Reference numeral 9 denotes a secondary corona discharger, 9 a movable original table (original table), and 10 a light source which is used as the document table 9 and a light source for blank exposure and sharp cut exposure.
１１は上記ランプの反射笠（笠）、１２は素子アレイで
原稿台の反射光を感光体６に導くために作用する。Reference numeral 11 denotes a reflecting shade (shade) for the lamp, and 12 an element array which serves to guide reflected light from the document table to the photoreceptor 6.
また１３は第２放電器８のシールド板１４に設けた開口
で、１５は遮光板で光源１０からのブランク露光用の光
を感光体に対して遮光又は露光するために作用し、１６
はシャープカット及びブランク露光用の光を感光体の所
定位置に露光するためのスリットである。Further, 13 is an opening provided in the shield plate 14 of the second discharger 8, 15 is a light shielding plate that acts to block or expose the photoreceptor to blank exposure light from the light source 10, and 16
is a slit for exposing a predetermined position of the photoreceptor to light for sharp cut and blank exposure.
なお、放電器のシールド部材１４に設けられた上記開口
１３も、笠１１のスリット状開口１６と同様、感光体６
の全幅を均一照明可能な長さを有している。Note that the opening 13 provided in the shield member 14 of the discharger is also similar to the slit-shaped opening 16 of the cap 11, and the photoreceptor 6
It has a length that allows uniform illumination of the entire width.
従って、上記２つの開口１３・１６は感光体６の幅と方
向について、この幅とほぼ等しい長さ以上の長さを有し
ていることが好ましい。Therefore, it is preferable that the two openings 13 and 16 have a length approximately equal to or greater than the width of the photoreceptor 6 in the width and direction.
上記遮光板１５はロータリーソレノイド１７の作動によ
り開口１３・１６間の光路中に出し入れされるようにな
っている。The light shielding plate 15 is moved in and out of the optical path between the openings 13 and 16 by the operation of a rotary solenoid 17.
ソレノイド１７は制御回路１８からの信号により作動さ
れ、原稿台９が往動する前、及び連続複写の場合の各複
写工程の間の原稿台９の復動時、及び前述の後処理には
遮光板１５を破線位置、即ち上記光路外に退避させて感
光体６全幅をほぼ一様に照明してブランク露光を行い、
一方、原稿台９の往動時、即ち感光体６に前記の如く原
稿に対応する電荷パターンを形成する時は実線位置、即
ち上記光路中に入れて光源１０から開口１６・１３を通
った光が感光体６の像形成用領域に入射しないようにす
るとともに、開口１６・１３を通った光源からの光の一
部を感光体６の像形成用領域の外側には入射せしめるよ
うにする。The solenoid 17 is operated by a signal from the control circuit 18, and is shielded from light before the document table 9 moves forward, when the document table 9 moves backward between each copying process in the case of continuous copying, and during the above-mentioned post-processing. The plate 15 is retracted to the position indicated by the broken line, that is, out of the optical path, and the entire width of the photoreceptor 6 is illuminated almost uniformly to perform blank exposure.
On the other hand, when the document table 9 moves forward, that is, when forming the charge pattern corresponding to the document on the photoreceptor 6 as described above, the solid line position is selected, that is, the light that enters the optical path and passes through the apertures 16 and 13 from the light source 10. The light from the light source passing through the openings 16 and 13 is allowed to enter outside the image forming area of the photosensitive member 6.
上記原稿台９の往動時の遮光板１５の作用を第８図に示
ス。FIG. 8 shows the action of the light shielding plate 15 when the document table 9 moves forward.
光源１０のフイラメン）１０ａの発する光は板１５によ
って感光体６の像形成領域Ａに対して遮蔽されるが、フ
ィラメント１０ａを発した光の一部は遮光板１５の縁端
外を通過して感光体６の画像形成領域Ａの外側の境界領
域Ｂに入射する。The light emitted by the filament 10a of the light source 10 is blocked by the plate 15 from the image forming area A of the photoreceptor 6, but part of the light emitted from the filament 10a passes outside the edge of the light blocking plate 15. The light is incident on the outer boundary area B of the image forming area A of the photoreceptor 6.
即ち、遮光板１５の影が上記領域Ａの端まで形成される
ものである。That is, the shadow of the light shielding plate 15 is formed up to the end of the area A.
以上述べたように、ブランク露光時には板１５が破線位
置に退避させ、従って開口１６・１３を通って来た光が
原稿像露光部において感光体全幅をほぼ均一に照明する
ので感光体には全面真白の原稿像を投影したのと等価と
なり、それ敏感光体からは電荷が消散して現像剤は付着
しないことになる。As described above, during blank exposure, the plate 15 is retracted to the dotted line position, and therefore the light passing through the openings 16 and 13 almost uniformly illuminates the entire width of the photoreceptor in the original image exposure area. This is equivalent to projecting a pure white original image, and the electric charge is dissipated from the photosensitive material, and no developer is attached to it.
また原稿台９の往動時、即ち原稿の潜像を形成するため
に原稿光像を上記領域Ａに投影する時は板１５が実線位
置に配置されるので笠１１の開口１６を通った光は上記
領域Ａに対して遮蔽されて静電潜像が形成され、一方上
記領域Ｂに対してはほぼ均一な光が照射されるから同領
域の電荷は消散して現像剤が付着することはない。Furthermore, when the document table 9 moves forward, that is, when projecting the document light image onto the area A to form a latent image of the document, the plate 15 is placed at the solid line position, so that light passes through the opening 16 of the shade 11. The area A is shielded and an electrostatic latent image is formed, while the area B is irradiated with almost uniform light, so the charge in the area is dissipated and no developer is attached. do not have.
従って前述したようなりリーニング手段の負担が増大す
る不都合、分離手段が現像剤で汚れる不都合等も防止で
きる。Therefore, it is possible to prevent the above-mentioned disadvantages such as an increase in the burden on the cleaning means and the inconvenience that the separating means is contaminated with developer.
更に、台９の往動時に前述の如く領域Ｂを照明すること
による更に別の効果は、静電潜像の両端部を鮮明にする
ことができるということであり、これにより、例えば端
に黒地があるような原稿でも端部の鮮やかな複写を得る
ことができる。Furthermore, another effect of illuminating the area B as described above during forward movement of the table 9 is that both ends of the electrostatic latent image can be made clear, so that, for example, a black background can be seen at the end. Even if the edges of the original are rough, you can obtain a copy with clear edges.
ところで、上記の如き露光装置においてはシャッタとし
て作動する遮光板の端部１５ａの形状が適当でないと、
第５図で述べた理由により境界部を鮮明に再生すること
が不可能となる。By the way, in the exposure apparatus as described above, if the shape of the end portion 15a of the light shielding plate that operates as a shutter is not appropriate,
For the reason described in FIG. 5, it is impossible to reproduce the boundary clearly.
即ち、ランプ１０の境界領域を照明するフィラメント１
０ａが境界線よりも外側に存在するため、第５図の光源
５ａの場合に対応し、境界部を鮮明にする効果が減衰す
る。That is, the filament 1 illuminates the border area of the lamp 10.
Since 0a exists outside the boundary line, the effect of sharpening the boundary part is attenuated, corresponding to the case of the light source 5a in FIG. 5.
ここで実施例を第９図、第１０図に従って説明する。An embodiment will now be described with reference to FIGS. 9 and 10.
この第９図と第１０図は第７図の境界領域露光部に対応
するもので、第９図は斜視図、第１０図は正面図を示し
、同一部材には同一図番が付しであるが、第９図では感
光体面を平面に想定して説明する。These Figures 9 and 10 correspond to the boundary area exposure section in Figure 7, with Figure 9 showing a perspective view and Figure 10 showing a front view, and the same parts are given the same figure numbers. However, in FIG. 9, the photoreceptor surface is assumed to be a flat surface.
図中ＡＤは近似的に感光体６の像形成領域の外側を露光
するための光源とみなす。In the figure, AD is approximately regarded as a light source for exposing the outside of the image forming area of the photoreceptor 6.
ＢＥは遮光板１５の端部で、ＣＦ’は感光体上の好まし
い遮光板１５の影の端部、ＣＦは実際に形成された影の
端部を示す。BE is the end of the light shielding plate 15, CF' is the end of the preferred shadow of the light shielding plate 15 on the photoreceptor, and CF is the end of the actually formed shadow.
本実施例においては説明を容易にするためＡＣの中点に
Ｂ点が存在するものと仮定する。In this embodiment, for ease of explanation, it is assumed that point B exists at the midpoint of AC.
また２ＡＤ＝（ＢＥのｙ軸成分）とすると、このとき点
Ａ−Ｂ−Ｃ−Ｄ−Ｅ−Ｆ・Ｆ′はそれぞれ
Ａ （−Ｘ、 Ｙ、 Ｚ）
Ｂ （０，０，０）
Ｃ（Ｘ、 −Ｙ、 −Ｚ）
Ｄ （−Ｘ、Ｙ十ａ、Ｚ）
Ｅ （０？ ２ ａ、ｚｌ）
Ｆ （Ｘ十丁−Ｙ、 −Ｚ−Ｚ２）
Ｆ’ （Ｘ＋ＣＦ’？ −ｙｔ −Ｚ）
であり、Ｆｏは（ＢＥＧ＝（Ｒと想定した時の点Ｅ＊１
に対応する影の位置である。Also, if 2AD=(y-axis component of BE), then the points A-B-C-D-E-F and F' are respectively A (-X, Y, Z) B (0,0,0) C (X, -Y, -Z) D (-X, Y10a, Z) E (0? 2 a, zl) F (X10-Y, -Z-Z2) F'(X+CF'? -yt -Z), and Fo is the point E*1 when assuming (BEG=(R)
is the position of the shadow corresponding to .
これに対してその状態は、〈ＢＥＧをある鈍角に形成し
であるため、実際にはＦの位置に影が出来る。On the other hand, in that situation, since the BEG is formed at a certain obtuse angle, a shadow is actually created at the F position.
しかし、この状態でも鮮明な境界を形成できないので更
に影ＦをＦ′に補正する必要がある。However, even in this state, a sharp boundary cannot be formed, so it is necessary to further correct the shadow F to F'.
以下式によりこの補正量を求めてみる。上記構成では点
Ｄ−Ｅ−Ｆが一直線上にあるため、
ＢＥｘＢＦ＋ＢＦｘＢＤｘＢＥ＝Ｑ
となり、即ち、
これを展開すると、
（３ａＺ−１−（２Ｙ ＋ ａ） Ｚ１＋（Ｙ ａ）
ｚ２） Ｉ＋ （２ＸＸＺ１−ＸＺ） Ｊ ＋ （−
３ａＸ） Ｋ＝０と記式より実際の影と好ましい影との
間に生じる誤差をなくすには求めるには４がＯであれば
良いから、
３ａＺ＋ （２Ｙ 十ａ ） Ｚ□十（Ｙ ａ ）
ｚ２” ０より
を満足すれば良いことがわかる。This correction amount will be calculated using the following formula. In the above configuration, since the points D-E-F are on a straight line, BExBF+BFxBDxBE=Q, that is, when expanded, (3aZ-1-(2Y + a) Z1+(Y a)
z2) I+ (2XXZ1-XZ) J+ (-
3 a
It can be seen that it is sufficient to satisfy z2'' than 0.
ここで実際に遮光板１５の幅が６１ｒｒ！ＩＬでＹが２
０ｒｒａｎ、 Ｚが１−と仮定すると、
となり、遮光板１５の点Ｅを内側に２ｒｒｒｍ短くして
作成することにより、好ましい形状の遮光板を形成する
ことが可能となる。Here, the actual width of the light shielding plate 15 is 61rr! Y is 2 in IL
Assuming that 0rran and Z is 1-, then the following equation is obtained, and by shortening the point E of the light shielding plate 15 inward by 2rrrm, it is possible to form a light shielding plate with a preferable shape.
以上、本考案によれば、像形成領域とその側端側の境界
領域との間の境界を鮮明に形成することができ、像の側
端部が不鮮明になったり、或いは上記境界領域が十分な
明部電位とならないような不都合を防止できる。As described above, according to the present invention, it is possible to clearly form the boundary between the image forming area and the boundary area on the side edge side of the image forming area, so that the side edge of the image becomes unclear or the boundary area is not sufficiently formed. Inconveniences such as not having a bright bright area potential can be prevented.
第１図から第３図は本考案の適用可能な場合を示す模式
図、第４図と第５図は本考案の原理を示す遮光板端部の
斜視図、第６図は遮光板の平面図、第７図は実際装置の
露光部側面図、第８図は光源部の平面断面図、第９図は
実施例説明のための露光部斜視図で第１０図は回部の正
面図を示す。
図において、１は光源、２・３は感光体、４は遮光板、
５は光源、６は感光体、１０は光源、１５は遮光板を示
す。Figures 1 to 3 are schematic diagrams showing cases where the present invention can be applied, Figures 4 and 5 are perspective views of the end of the light shielding plate showing the principle of the present invention, and Figure 6 is a plane view of the light shielding plate. 7 is a side view of the exposure section of the actual device, FIG. 8 is a plan sectional view of the light source section, FIG. 9 is a perspective view of the exposure section for explaining the embodiment, and FIG. 10 is a front view of the rotation section. show. In the figure, 1 is a light source, 2 and 3 are photoreceptors, 4 is a light shielding plate,
5 is a light source, 6 is a photoreceptor, 10 is a light source, and 15 is a light shielding plate.
Claims (5)
の幅より狭い幅を有する像形成領域に所望する静電潜像
を形成するための潜像形成手段を有する画像形成装置に
おいて、上記感光体の像形成領域の側端側の境界領域に
均一な光を露光する手段を有し、この露光手段は感光体
面上の位置により異なる距離をこの感光体面間で形成す
る光源と、この感光体面と光源との間に位置する遮光部
材を有し、この遮光部材は上記像形成領域と境界領域と
の境に対応する端部が、像形成領域と境界領域との境界
を通り感光体面に垂直な面と非平行な端部になるように
構威し、上記遮光部材で遮断される光による上記遮光部
材端部の影を、感光体上で上記境界に沿って形成するこ
とを特徴とする画像形成装置。(1) In an image forming apparatus having a photoreceptor to which electrophotography is applied and a latent image forming means for forming a desired electrostatic latent image in an image forming area having a width narrower than the width of the photoreceptor, the above-mentioned The exposure means includes a light source that forms a distance between the photoreceptor surfaces that varies depending on the position on the photoreceptor surface; A light shielding member is provided between the body surface and the light source, and the end portion of the light shielding member corresponding to the boundary between the image forming area and the boundary area passes through the boundary between the image forming area and the boundary area and reaches the photoreceptor surface. The light shielding member is arranged such that the end thereof is non-parallel to a perpendicular surface, and a shadow of the end of the light shielding member due to the light blocked by the light shielding member is formed on the photoreceptor along the boundary. image forming device.
であることを特徴とする実用新案登録請求の範囲第（１
）項に記載の画像形成装置。(2) Utility model registration claim No. 1, characterized in that the light shielding member is a light shielding plate that covers the image forming area of the photoreceptor.
).
開口を有する遮光板であることを特徴とする実用新案登
録請求の範囲第（１）項に記載の画像形成装置。(3) The image forming apparatus according to claim (1), wherein the light shielding member is a light shielding plate having a slit opening corresponding to the boundary area.
プを用いることを特徴とする実用新案登録請求の範囲第
（１）項に記載の画像形成装置。(4) The image forming apparatus according to claim (1), wherein the light source is a lamp for original illumination of the latent image forming section.
遮光部材は、前記静電潜像の形成時は前記光源と感光体
の間の照明光路中に入って感光体の像形成領域を覆って
前記境界領域のみを照明せしめ、静電潜像の非形成時は
上記照明光路から退避して感光体の像形成領域も照明せ
しめる可動遮光板であることを特徴とする実用新案登録
請求の範囲第（１）項又は第（４）項記載の画像形成装
置。(5) The light source is capable of illuminating the entire width of the photoreceptor, and the light shielding member enters an illumination optical path between the light source and the photoreceptor to form an image forming area of the photoreceptor when forming the electrostatic latent image. A request for registration of a utility model characterized in that the movable light-shielding plate is a movable light-shielding plate that illuminates only the boundary area by covering the area, and when an electrostatic latent image is not formed, retreats from the illumination optical path and illuminates the image forming area of the photoreceptor. The image forming apparatus according to the range (1) or (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3939879U JPS609792Y2 (en) | 1979-03-27 | 1979-03-27 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3939879U JPS609792Y2 (en) | 1979-03-27 | 1979-03-27 | Image forming device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55141134U JPS55141134U (en) | 1980-10-08 |
| JPS609792Y2 true JPS609792Y2 (en) | 1985-04-05 |
Family
ID=28906156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3939879U Expired JPS609792Y2 (en) | 1979-03-27 | 1979-03-27 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS609792Y2 (en) |
-
1979
- 1979-03-27 JP JP3939879U patent/JPS609792Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55141134U (en) | 1980-10-08 |
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