JPS6224788B2 - - Google Patents
Info
- Publication number
- JPS6224788B2 JPS6224788B2 JP7788078A JP7788078A JPS6224788B2 JP S6224788 B2 JPS6224788 B2 JP S6224788B2 JP 7788078 A JP7788078 A JP 7788078A JP 7788078 A JP7788078 A JP 7788078A JP S6224788 B2 JPS6224788 B2 JP S6224788B2
- Authority
- JP
- Japan
- Prior art keywords
- photoreceptor
- image
- shutter
- light source
- lamp
- 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
Links
- 108091008695 photoreceptors Proteins 0.000 claims description 110
- 230000008859 change Effects 0.000 claims description 17
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 230000003287 optical effect Effects 0.000 description 26
- 238000012546 transfer Methods 0.000 description 16
- 238000004140 cleaning Methods 0.000 description 14
- 238000003384 imaging method Methods 0.000 description 12
- 230000007246 mechanism Effects 0.000 description 12
- 238000000034 method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 12
- 238000005286 illumination Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 230000004397 blinking Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 210000000078 claw Anatomy 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000007723 transport mechanism Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Landscapes
- Exposure Or Original Feeding In Electrophotography (AREA)
Description
【発明の詳細な説明】
本発明は画像形成装置の露光系の改良に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an exposure system of an image forming apparatus.
周知の如く、普通紙に複写画像を形成する転写
式電子写真装置では、回転ドラムや無端ベルトに
電子写真感光体を設け、所定の無端径路を循環運
動させ、そしてその運動する感光体にまず所望の
静電潜像を形成し、次にこの潜像を現像し、次に
現像された像を紙等に転写し、そして転写後感光
体上に残つた現像剤をクリーニングする構成を有
している。ところで、この種の電子写真装置で像
を形成するにあたつて、感光体に潜像形成する前
段階、又潜像を形成して、現像転写の終つた後の
段階において、そして連続像形成を行う場合には
各像形成の間の段階において、潜像形成用の光像
は感光体に投影しないでおいて感光体を所定時間
運動させておくものがある。この様な装置では潜
像形成用等の帯電器や現像器等を作動させる事が
行なわれている場合があり、この様に潜像形成用
の光像を投影しないで現像器は作動させている
為、もし光像露光部等で適当な照明光を感光体に
与えてやらなければ、感光体全面にベタ黒状に現
像剤が吸着してしまう。吸着した現像剤は転写材
に転写されないから全てクリーニング手段で除去
しなければならないが、そうするとクリーニング
手段の負担が大きくなる。そしてその結果、十分
なクリーニングができなくなるばかりか、クリー
ニング手段の寿命を縮め、又装置内への現像剤の
飛散量が急激に増大して装置の故障を誘発する。
更に又、現像器から出る現像剤が多くなるから現
像器内での現像剤濃度が急激に低下すると共に、
一方クリーニング手段から現像器へ現像剤を戻す
手段が大型になる。従つて、この様な不都合を解
決する為に、前記の光像非投影下での感光体の運
動時にも感光体には光像露光部等、少なくとも現
像部の前の位置でこの感光体に略均一な照明光を
与える様にしている。これをブランク露光と称す
るが、従来このブランク露光は、感光体への光像
投影光路に近接して配置されたランプを、潜像形
成時には消灯し潜像非形成時に点灯して感光体全
面を均一照明する事によつて行なわれる様になつ
ている。 As is well known, in a transfer-type electrophotographic device that forms a copy image on plain paper, an electrophotographic photoreceptor is installed on a rotating drum or an endless belt, and the electrophotographic photoreceptor is moved in circulation along a predetermined endless path. The electrostatic latent image is formed, the latent image is developed, the developed image is transferred to paper, etc., and the developer remaining on the photoreceptor is cleaned after the transfer. There is. By the way, when forming an image with this type of electrophotographic device, there are two steps: before forming a latent image on a photoreceptor, after forming a latent image and completing development and transfer, and during continuous image formation. In some cases, the photoreceptor is moved for a predetermined period of time without projecting an optical image for forming a latent image onto the photoreceptor at a stage between each image formation. In some cases, such devices operate a charger, a developing device, etc. for forming a latent image, and in this way, the developing device is operated without projecting an optical image for forming a latent image. Therefore, if appropriate illumination light is not applied to the photoreceptor at a light image exposure section or the like, the developer will be adsorbed in a solid black form over the entire surface of the photoreceptor. Since the adsorbed developer is not transferred to the transfer material, all of it must be removed by the cleaning means, but this increases the burden on the cleaning means. As a result, not only is sufficient cleaning not possible, but the life of the cleaning means is shortened, and the amount of developer scattered into the device increases rapidly, leading to device failure.
Furthermore, as more developer comes out of the developing device, the developer concentration within the developing device decreases rapidly.
On the other hand, the means for returning the developer from the cleaning means to the developing device becomes large. Therefore, in order to solve this inconvenience, even when the photoreceptor moves without projecting a light image, a light image exposure section or the like is attached to the photoreceptor at least at a position in front of the developing section. It is designed to provide approximately uniform illumination light. This is called blank exposure, and conventionally, in blank exposure, a lamp placed close to the optical path for projecting a light image onto the photoreceptor is turned off when a latent image is formed, and turned on when no latent image is formed, to cover the entire surface of the photoreceptor. This is done by providing uniform illumination.
しかし、この様にランプを点滅させることは、
ランプの寿命が低下するので好ましくなく、又点
滅時にノイズを発生して電子写真装置の制御系の
IC等に悪影響を及ぼすことがある。しかも、消
灯時の残照が画像形成に影響を与えて端部画像が
ボケてしまうことがある等の欠点を有している。 However, blinking the lamp like this
This is undesirable because it shortens the life of the lamp, and it also generates noise when blinking, which can affect the control system of electrophotographic equipment.
It may have an adverse effect on IC, etc. Moreover, it has drawbacks such as afterglow when the lights are turned off affecting image formation, resulting in blurred edge images.
一方、一般に感光体の幅は光像が投影され、静
電潜像が形成される像形成用領域の幅より若干広
く設定されているが、この像形成用領域の外側の
領域にも帯電器、現像器等は作用するから、所望
潜像を形成する為に前記のブランク露光用ランプ
を消灯して光像を感光体に投影すると、上記感光
体の外側領域に現像剤が帯状に濃く付着してしま
う。この外側領域に付着した現像剤はクリーニン
グに関連して前記と同様の欠点を招来する。又更
に、転写部において感光体に吸着せしめられた紙
等の転写材を感光体から分離する為に、この感光
体画像領域の外側に爪状又はベルト状等の分離用
部材が接触せしめられている場合には、上記画像
領域の外側に帯状に付着したトナーがこの分離用
部材を汚し、そしてこの汚れが更に転写材を汚し
てしまうという不都合も生ずる。 On the other hand, the width of the photoreceptor is generally set to be slightly wider than the width of the image forming area where the optical image is projected and the electrostatic latent image is formed, but the area outside of this image forming area also has a charger. , the developing device etc. act, so when the blank exposure lamp is turned off and the light image is projected onto the photoreceptor in order to form a desired latent image, the developer adheres in a dense band shape to the outer area of the photoreceptor. Resulting in. Developer deposited in this outer region leads to the same drawbacks mentioned above in connection with cleaning. Furthermore, in order to separate the transfer material such as paper adsorbed onto the photoreceptor from the photoreceptor in the transfer section, a separation member such as a claw or a belt is brought into contact with the outside of the image area of the photoreceptor. In this case, the toner adhering in a belt shape to the outside of the image area stains the separating member, and this stain further stains the transfer material.
本発明の主目的は上記の様な従来装置の欠点を
解決する事にある。即ち、本発明はランプの点滅
によるブランク露光の欠点をなくし、且つ前記ブ
ランク露光時には勿論感光体全面を照明し、そし
て静電潜像形成の為に光像を投影する時にも感光
体の像形成用領域の外側領域を照明し、その領域
の感光体表面帯電を消去できる様にした電子写真
装置を提供することを目的とする。 The main purpose of the present invention is to solve the above-mentioned drawbacks of conventional devices. That is, the present invention eliminates the drawbacks of blank exposure due to blinking of a lamp, illuminates the entire surface of the photoreceptor during the blank exposure, and also improves image formation on the photoreceptor when projecting a light image to form an electrostatic latent image. An object of the present invention is to provide an electrophotographic apparatus that can illuminate an area outside a photoreceptor area and erase the charge on the surface of a photoreceptor in that area.
上記目的を達成する本発明は、電子写真感光体
に対し、スリツト状に原稿像を露光する電子写真
装置において、感光体の回転軸方向に沿つて設け
た光源と、該光源と上記感光体との間に設けたシ
ヤツター手段と、上記原稿像を感光体上にスリツ
ト露光する為に作動する往復移動手段と、上記往
復移動手段を駆動するための駆動力を与える駆動
手段と、上記駆動手段により回転する回転手段で
あつて、上記往復移動手段の往復移動方向の転換
に同期して回転方向の切り換わる回転手段と、上
記回転手段の回転方向変化に同期して上記シヤツ
ター手段を開閉するように上記回転手段に取付け
られたシヤツター開閉手段とを有している。そし
て、光学系が感光体上に原稿像を露光する状態に
ある時は、上記シヤツターを遮断位置にして上記
光路を遮り、又光学系が感光体上に原稿像を露光
しない状態の時には、上記シヤツターを開放位置
にして上記光路を開放する構成にし、上記感光体
上に原稿像を露光しない時には該感光体上に静電
潜像を形成しない様にしたものである。上記構成
により潜像形成用のコロナ放電器が作動し続けて
いても、感光体が非画像露光状態になつたとして
も、上記シヤツターの開閉によるブランク露光が
成される為、該感光体の原稿露光時外には潜像が
形成される事が無い。従つて、上記の様にコロナ
放電器が作動していて、且つ感光体に原稿像の露
光が成されなくとも、該感光体に静電潜像が形成
されないから、感光体は現像手段により現像され
る事が無い為、感光体に付着した現像剤とクリー
ニング手段との関連で生じていた上記従来の間題
点は解決される。 To achieve the above object, the present invention provides an electrophotographic apparatus that exposes an original image to an electrophotographic photoreceptor in the form of a slit. a shutter means provided between the two, a reciprocating means that operates to perform slit exposure of the original image onto the photoreceptor, a driving means for applying a driving force to drive the reciprocating means, and A rotary means that rotates and whose rotational direction is switched in synchronization with a change in the direction of reciprocating movement of the reciprocating means, and a shutter means that opens and closes in synchronization with a change in the rotational direction of the rotary means. and a shutter opening/closing means attached to the rotating means. When the optical system is in a state where the original image is exposed on the photoreceptor, the shutter is set to the blocking position to block the above-mentioned optical path, and when the optical system is not in a state where the original image is exposed on the photoreceptor, the shutter is The shutter is set to an open position to open the optical path, and an electrostatic latent image is not formed on the photoreceptor when the original image is not exposed on the photoreceptor. With the above configuration, even if the corona discharger for latent image formation continues to operate, even if the photoreceptor is in a non-image exposure state, blank exposure is achieved by opening and closing the shutter, so the document on the photoreceptor is No latent image is formed outside of exposure. Therefore, even if the corona discharger is operating as described above and the photoreceptor is not exposed to the original image, no electrostatic latent image is formed on the photoreceptor, so the photoreceptor cannot be developed by the developing means. Therefore, the above-mentioned conventional problems caused by the relationship between the developer attached to the photoreceptor and the cleaning means are solved.
更に、上記電子写真感光体は該感光体自身の幅
よりも狭い幅を画像形成用の画像領域として使用
し、又上記光源は感光体の幅全域を露光するだけ
の長さを有し、上記スリツトの作動に関係なく、
該スリツト端部より上記光源からの光が感光体の
非画像領域を露光する構成を採用する事により、
帯電器が感光体の非画像領域まで伸びて常時コロ
ナ放電を行なおうとも、該感光体の非画像領域は
上記光源により露光される為、感光体端部の非画
像領域は常に現像される事が無い。即ち、上記構
成により原稿の露光時.非露光時を問わず感光体
端部は現像されず、前記の現像剤とクリーニング
手段との問題点を更に改善する事が可能となる。 Further, the electrophotographic photoreceptor uses a width narrower than the width of the photoreceptor itself as an image area for image formation, and the light source has a length sufficient to expose the entire width of the photoreceptor, Regardless of the slit operation,
By adopting a configuration in which the light from the light source exposes the non-image area of the photoreceptor from the end of the slit,
Even if the charger extends to the non-image area of the photoreceptor and constantly performs corona discharge, the non-image area of the photoreceptor is exposed by the light source, so the non-image area at the end of the photoreceptor is always developed. There's nothing wrong. That is, with the above configuration, when exposing the original. The end portion of the photoreceptor is not developed regardless of whether it is not exposed to light, making it possible to further improve the problems with the developer and cleaning means described above.
ところで、上記本発明において往復移動手段と
は、原稿を載置し往復移動する透明原稿載置台で
あつたり、又は逆に固定された原稿台を走査する
ミラー.ランプ等の走査手段である。一方、感光
体の軸方向に沿つて設けた光源とは原稿照明用の
ランプを用いる事ができ、この様に照明用ランプ
をブランク露光用ランプと兼ねる構成は装置内の
発熱量を押えたり消費電力の低減化、更には装置
内の空間利用の面で好ましい形態と言える。 Incidentally, in the present invention, the reciprocating means may be a transparent document placing table on which a document is placed and moved back and forth, or conversely, a mirror that scans a fixed document table. This is a scanning means such as a lamp. On the other hand, a lamp for document illumination can be used as the light source provided along the axial direction of the photoreceptor, and this configuration in which the illumination lamp also serves as a blank exposure lamp reduces the amount of heat generated within the device and reduces consumption. This can be said to be a preferable form in terms of power reduction and space utilization within the device.
以下、本発明を電子写真複写装置に適用した場
合を例にとり説明する。 Hereinafter, the present invention will be explained using an example in which the present invention is applied to an electrophotographic copying apparatus.
第1図は本発明の一実施例電子写真複写装置を
説明する為の略画断面図である。本図実施例では
被複写原稿の光像を感光体に投影する結像光学系
として短焦点小結像素子アレイを使用している。
短焦点小結像素子アレイとは、特公昭47―28057
号公報、同47―28058号公報等に記載されている
様な、中心から半径方向外側に向つて屈折率が放
物線的に漸減している棒状導光素子や、本発明の
出願人の出願による特願昭52―37315号明細書に
記載されている様なバーレンズ系素子等、物体の
等倍正立実像を形成できる短焦点小結像素子の多
数を、夫々の光軸を平行にして一段、又は複数段
密に(例えば俵積み状に)配列して成るもので、
夫々の素子が協働して物体の等倍正立実像を形成
する事ができる。この様な小結像素子アレイを使
用する事によつて、原稿光像結像用光学系を簡素
化でき、又装置を小型化できる等の利点或いは後
述の利点もあるが、本発明は通常の所謂単眼スル
ーレンズ、単眼インミラーレンズ等を原稿光像形
成用に使用する複写装置にも適用できるものであ
る。 FIG. 1 is a schematic sectional view for explaining an electrophotographic copying apparatus according to an embodiment of the present invention. In this embodiment, a short-focus small imaging element array is used as an imaging optical system for projecting an optical image of an original to be copied onto a photoreceptor.
What is short focus small imaging element array?
A rod-shaped light guiding element in which the refractive index gradually decreases parabolically from the center toward the outside in the radial direction, as described in Japanese Patent No. 47-28058, etc., and a rod-shaped light guiding element as described in the application filed by the applicant of the present invention. A large number of short-focus small imaging elements capable of forming a same-magnification erect real image of an object, such as a bar lens system element as described in Japanese Patent Application No. 52-37315, are arranged in one stage with their optical axes parallel to each other. , or arranged in multiple stages densely (for example, in the form of bales),
Each element can work together to form an erect real image of the object at the same size. By using such a small imaging element array, there are advantages such as the simplification of the optical system for optical image formation of the document and the miniaturization of the apparatus, as well as other advantages described below. The present invention can also be applied to a copying apparatus that uses a so-called monocular through lens, a monocular in-mirror lens, or the like for forming a light image of an original.
さて、第1図で1は感光ドラムでモータ(図示
せず)を駆動源として矢印方向に定速回転駆動さ
れる。上記ドラム1はその周面に、導電体基層、
光導電体層、表面の透明絶縁体層を順に積層して
成る本発明の出願人による特公昭42―23910号公
報に記載のある電子写真感光体1aを有してい
る。ドラム1の回転に従つて、感光体1aの表面
にはまず放電器2よりのDCコロナ放電が印加さ
れる。放電器2の放電極性は前記光導電体がN型
半導体の場合は正(+)、P型の場合は負(−)
である。更に感光体1aは次に放電器3からの
AC又は上記放電器2とは逆極性のDCコロナ放電
を受け、そして原稿の静電像形成時にはこれと同
時に原稿Oの光像が投射される。そしてその後、
感光体1aにランプ6の光を用いて全面均一露光
を行なう事により該感光体1aには原稿Oの光像
に対応した電荷パターンが形成される。 In FIG. 1, reference numeral 1 denotes a photosensitive drum which is rotated at a constant speed in the direction of the arrow using a motor (not shown) as a driving source. The drum 1 has a conductive base layer on its circumferential surface.
It has an electrophotographic photoreceptor 1a described in Japanese Patent Publication No. 42-23910 by the applicant of the present invention, which comprises a photoconductor layer and a transparent insulator layer on the surface, which are laminated in this order. As the drum 1 rotates, DC corona discharge from the discharger 2 is first applied to the surface of the photoreceptor 1a. The discharge polarity of the discharge device 2 is positive (+) when the photoconductor is an N-type semiconductor, and negative (-) when the photoconductor is a P-type semiconductor.
It is. Furthermore, the photoreceptor 1a is then fed from the discharger 3.
It receives an AC or DC corona discharge with a polarity opposite to that of the discharge device 2, and at the same time when forming an electrostatic image of the original, an optical image of the original O is projected. And after that
By uniformly exposing the entire surface of the photoreceptor 1a to light from the lamp 6, a charge pattern corresponding to the optical image of the original O is formed on the photoreceptor 1a.
さて、原稿Oの光源は、前述の等倍正立実像を
形成する、結像性棒状導光素子、バーレンズ系素
子等の短焦点小結像素子のアレー4により上記感
光体1aの回転方向と直交する方向についての幅
より狭い幅を有する像形成領域上に結像される。
一方、原稿Oは載置台5のプラテンガラス上に載
置されている。この台5は、ドラム1の回転に同
期して、モータを駆動源として矢印方向に移動せ
しめられ、これによつて原稿Oを走査する様にな
つている。そしてアレイ4が原稿の光像をスリツ
ト露光的に感光体1aに露光する。原稿Oの上記
走査工程が終了すると、台5は矢印と逆方向に移
動され、始動位置に復帰される。尚、台5の往動
時の速度はドラム1の周速度と同じであるが、復
動時の速度はそれよりも速くなる様駆動する事で
複写速度を向上する事ができる。走査工程におい
て原稿Oにアレイ4が対向する領域は、反射笠7
を従えたハロゲンランプ等のランプ6が発する光
により照明される様になつている。尚、図から明
らかな様に、小結像素子アレイ4は、その長手方
向が原稿載置台5の移動方向と直角になる様に、
従つて又、ドラム1の回転軸と平行になる様に配
置されており、複写可能な最大幅の原稿を感光体
上の前記像形成用領域に形成できるだけの幅を有
している。 Now, the light source of the original O is provided by an array 4 of short-focus small imaging elements such as an image-forming rod-shaped light guiding element and a bar lens element, which form the same-magnification erect real image as described above, and are arranged in the direction of rotation of the photoreceptor 1a. The image is formed onto an imaging area having a width narrower than the width in the orthogonal direction.
On the other hand, the original O is placed on the platen glass of the mounting table 5. The table 5 is moved in the direction of the arrow in synchronization with the rotation of the drum 1 using a motor as a drive source, thereby scanning the original O. The array 4 then exposes the light image of the original onto the photoreceptor 1a in a slit exposure manner. When the scanning process of the original O is completed, the table 5 is moved in the direction opposite to the arrow and returned to the starting position. The speed of the table 5 when moving forward is the same as the circumferential speed of the drum 1, but the speed of the table 5 when moving backward is driven to be faster than that speed, thereby increasing the copying speed. The area where the array 4 faces the original O in the scanning process is covered with a reflective shade 7.
It is designed to be illuminated by light emitted from a lamp 6 such as a halogen lamp followed by a lamp. As is clear from the figure, the small imaging element array 4 is arranged such that its longitudinal direction is perpendicular to the direction of movement of the document table 5.
Therefore, it is arranged parallel to the rotation axis of the drum 1, and has a width sufficient to form the maximum width of an original that can be copied in the image forming area on the photoreceptor.
この様にしてアレイ4によつて原稿光像を露光
され、又、同時に放電器3で光像パターンに応じ
た表面帯電荷の除電を受けた感光体1aは、次に
全面均一な露光を受ける。これによつて高コント
ラストの静電潜像が感光体1a表面に形成され
る。上記全面露光は上記ランプ6によつて行う。
即ち、上記反射笠7の下部に感光体1aに対向す
る開口7aが設けられており、ランプ6から発し
た光の一部はこの開口7aを通り、感光体1aに
到達する様になつている。 In this way, the photoreceptor 1a is exposed to the original light image by the array 4, and at the same time, the surface charge is removed according to the light image pattern by the discharger 3, and then the entire surface of the photoreceptor 1a is uniformly exposed. . As a result, a high-contrast electrostatic latent image is formed on the surface of the photoreceptor 1a. The above-mentioned whole surface exposure is performed by the above-mentioned lamp 6.
That is, an opening 7a facing the photoreceptor 1a is provided at the lower part of the reflective shade 7, and a portion of the light emitted from the lamp 6 passes through this opening 7a and reaches the photoreceptor 1a. .
この様に感光体の光像投影後の全面均一露光用
のランプと原稿照明用のランプを同一とする事に
より、装置の製造コストを低減できると共に、上
記全面露光用の光源の作動状態を直接確認できる
から信頼性が高まる。この様に原稿照明用と上記
感光体の全面露光用とを同一のランプで兼用でき
るのは、結像光学系として小結像素子アレイ4を
使用した為、ランプ6と感光体1aの距離を接近
させ得、そして両者間に光量の低下を招く他の部
材、例えば光学系の鏡筒等を配設しなくてもよく
なつたからである。勿論、原稿照明用ランプとは
別に感光体の全面露光専用のランプを設けてもよ
い。 In this way, by using the same lamp for uniform exposure of the entire surface after the light image is projected on the photoreceptor and the lamp for illuminating the original, it is possible to reduce the manufacturing cost of the device, and to directly control the operating status of the light source for the entire surface exposure. Confirmation increases reliability. The reason why the same lamp can be used both for document illumination and for exposing the entire surface of the photoreceptor is because the small imaging element array 4 is used as the imaging optical system, and the distance between the lamp 6 and the photoreceptor 1a is shortened. This is because there is no need to dispose other members between the two that would cause a decrease in the amount of light, such as a lens barrel of an optical system. Of course, a lamp dedicated to exposing the entire surface of the photoreceptor may be provided separately from the original illumination lamp.
上記静電潜像は、感光体1aに現像剤を供給す
る現像器8にて現像され、可視トナー像が形成さ
れる。尚、現像器8はマゲネツトブラシ式等の様
な乾式の現像器であつても、又液体現像剤を使用
する湿式現像器であつてもよい。 The electrostatic latent image is developed by a developing device 8 that supplies developer to the photoreceptor 1a, forming a visible toner image. The developing device 8 may be a dry type developing device such as a magnetic brush type, or a wet type developing device using a liquid developer.
以上の様にして感光体上に形成されたトナー像
は、カセツト9から送出機構10によりドラム1
の回転に同期して送出搬送される転写紙Pに転写
される。転写部において転写紙Pの背面には、放
電器11によりトナー電荷と逆極性のコロナ放電
が印加され、これによつて転写効率が高められ転
写紙Pにトナー像が転写される。トナー像をを担
持した転写紙Pは感光体1aの像形成用領域外の
端部に先端が接触せしめられた分離爪12により
この感光体から剥離され、そして搬送機構12a
により定着器13に送られる。定着器13は上記
トナー像を加熱溶融して転写紙に定着する。尚、
定着器13としては図の如く熱ローラ式のもの
や、その他に輻射熱式、熱風式等、或いは圧力定
着器等も使用できる。定着器13を出た転写紙P
はトレイ14に排出される。 The toner image formed on the photoreceptor as described above is transferred from the cassette 9 to the drum 1 by the delivery mechanism 10.
The image is transferred onto a transfer paper P that is sent out and conveyed in synchronization with the rotation of the image forming apparatus. In the transfer section, a corona discharge having a polarity opposite to that of the toner charge is applied by a discharger 11 to the back surface of the transfer paper P, thereby increasing the transfer efficiency and transferring the toner image onto the transfer paper P. The transfer paper P carrying the toner image is separated from the photoreceptor 1a by a separation claw 12 whose tip is brought into contact with the edge of the photoreceptor 1a outside the image forming area, and then transferred to the transport mechanism 12a.
The image is sent to the fixing device 13. The fixing device 13 heats and melts the toner image and fixes it on the transfer paper. still,
As the fixing device 13, a heated roller type as shown in the figure, a radiant heat type, a hot air type, or a pressure fixing device can also be used. Transfer paper P leaving the fixing device 13
is discharged onto the tray 14.
上記転写工程後、感光体1a上に残留した現像
剤はクリーニング器15によつて除去される。ク
リーニング器15としては、図の如く感光体1a
にそのエツジを圧接されたゴム等の弾性体ブレー
ドを使用するものの他、フアーブラシを使用する
もの等が利用できる。クリーニング器15によ。
て表面を浄化された感光体1aは、再び次の複写
工程に使用されるものである。尚、感光体1aと
して導電体基層と表面の光導電層とから成る感光
体を用いるカールソン.プロセスに使用されるも
のを用いてもよく、この場合は感光体1aに対す
るコロナ放電器3、全面均一露光手段は不要であ
る。 After the transfer process, the developer remaining on the photoreceptor 1a is removed by a cleaning device 15. As the cleaning device 15, the photoreceptor 1a is used as shown in the figure.
In addition to those that use an elastic blade made of rubber or the like whose edges are pressed together, those that use a fur brush can be used. To the cleaning device 15.
The surface of the photoreceptor 1a whose surface has been purified is used again in the next copying process. In addition, Carlson et al. uses a photoreceptor consisting of a conductive base layer and a photoconductive layer on the surface as the photoreceptor 1a. Those used in the process may be used, and in this case, the corona discharger 3 and the uniform exposure means for the entire surface of the photoreceptor 1a are not necessary.
さて、第1図の複写装置においては、複写の準
備処理の為の所定時間、そして複写終了後の後処
理の為の所定時間、更に連続複写工程においては
各複写工程の間にも、前述した様に感光ドラム1
が回転せしめられ、又それと一緒に帯電器2,3
及び現像器8も作動せしめられ、更にランプ6も
点灯されて、感光体の感度の適正化、又その維
持、表面のクリーニング、帯電器、現像器の作動
の安定化、又その維持等がなされる様になつてい
る。 Now, in the copying apparatus shown in FIG. 1, the predetermined time for copy preparation processing, the predetermined time for post-processing after copying, and also between each copying process in the continuous copying process are as described above. Photosensitive drum 1
is rotated, and the chargers 2 and 3 are rotated together with it.
The developing device 8 is also activated, and the lamp 6 is also turned on to optimize and maintain the sensitivity of the photoreceptor, to clean the surface, and to stabilize and maintain the operation of the charging device and the developing device. It's starting to look like that.
上記装置においてブランク露光は、ランプ6が
放射した光の一部を放電器3の開口を介し、小結
像素子アレイ4の対向する原稿面に集光して行な
う。次に第2図の露光部拡大断面図に従つてこの
ブランク露光の詳細を説明する。 In the above apparatus, blank exposure is performed by condensing a portion of the light emitted by the lamp 6 through the opening of the discharger 3 onto the surface of the document facing the small image forming element array 4. Next, details of this blank exposure will be explained with reference to the enlarged sectional view of the exposed portion in FIG.
反射傘7には少なくとも感光体1aの軸方向全
幅を照明する能力を有する、即ち、感光体の全幅
を均一照明可能にランプ6の放射光を通過させ得
る長さのスリツト7bが設けてある。この構成に
より上記開口7b(以下この様な開口をスリツト
と称す)を通過した光源6の出射光は、放電器3
のシールド部材3aのスリツト3bから入射し、
放電器3の作用下の感光体1aを露光する。尚、
放電器3のシールド部材3aに設けられた上記ス
リツト3bも、上記傘7のスリツト7bと同様
に、感光体1aの全幅を均一照明可能にランプ6
から光を通過させるに十分な開口面積を有してい
る。従つて、上記2つのスリツト3b,7bはラ
ンプ口からの光を遮断する事なく、感光体の軸方
向全域に必要な光量を導くに十分な開口を構成し
ている。上記スリツト3bと7bとの間には、ラ
ンプ6から感光体1aへの光を選択的に遮断する
シヤツター16を有している。上記シヤツター1
6は板状に構成され、後述する機構により回動軸
16aを中心に回動する。 The reflector 7 is provided with a slit 7b having a length capable of illuminating at least the entire width of the photoreceptor 1a in the axial direction, that is, allowing the emitted light from the lamp 6 to pass through so as to uniformly illuminate the entire width of the photoreceptor. With this configuration, the emitted light from the light source 6 that has passed through the aperture 7b (hereinafter such an aperture will be referred to as a slit) is directed to the discharger 3.
enters from the slit 3b of the shield member 3a,
The photoreceptor 1a under the action of the discharger 3 is exposed. still,
Similarly to the slit 7b of the umbrella 7, the slit 3b provided in the shield member 3a of the discharger 3 also allows the lamp 6 to uniformly illuminate the entire width of the photoreceptor 1a.
The opening area is large enough to allow light to pass through. Therefore, the two slits 3b and 7b constitute an opening sufficient to guide the necessary amount of light to the entire axial direction of the photoreceptor without blocking the light from the lamp port. A shutter 16 is provided between the slits 3b and 7b for selectively blocking light from the lamp 6 to the photoreceptor 1a. Shutter 1 above
6 is configured in a plate shape and rotates around a rotation shaft 16a by a mechanism described later.
次に上記シヤツター16の回動機構を第3図か
ら第5図に従つて更に詳細に説明する。 Next, the rotation mechanism of the shutter 16 will be explained in more detail with reference to FIGS. 3 to 5.
第3図は原稿台を駆動する駆動ワイヤとプーリ
の構成を示す斜視図である。図において、原稿台
5の一端部にはワイヤ17が固定されており、こ
のワイヤ17は軸19に回転自在に取付けられた
変向プーリ18を介してワイヤ巻付プーリ20に
数回巻きつけられた後、再び変向プーリ18を介
して原稿台5の他端部に固定されている。原稿台
5はワイヤ巻付プーリ20が回転してワイヤ17
を巻き取ることにより往復移動する。 FIG. 3 is a perspective view showing the configuration of a drive wire and a pulley that drive the document table. In the figure, a wire 17 is fixed to one end of the document table 5, and this wire 17 is wound several times around a wire winding pulley 20 via a direction changing pulley 18 rotatably attached to a shaft 19. After that, it is again fixed to the other end of the document table 5 via the direction change pulley 18. The wire winding pulley 20 rotates and the wire 17 is attached to the document table 5.
It moves back and forth by winding it up.
第4図は、シヤツターを開閉するための手段を
設けた変向プーリの断面図である。図においてク
ラツチシユー21,23並びに揺動板22、押え
板24及び圧接力を発生させる圧接部材25(例
えば、板バネ等のバネ部材、又は発泡ウレタンの
様な弾性部材)が図示の如く軸19上に変向プー
リ18と一体的に配置され、摩擦クラツチを構成
している。 FIG. 4 is a sectional view of a deflection pulley provided with means for opening and closing the shutter. In the figure, clutches 21 and 23, a rocking plate 22, a presser plate 24, and a pressing member 25 that generates a pressing force (for example, a spring member such as a leaf spring, or an elastic member such as urethane foam) are mounted on a shaft 19 as shown in the figure. It is arranged integrally with the deflection pulley 18 to form a friction clutch.
シヤツターを開閉する揺動板22はクラツチシ
ユー21,23と摩擦力によつて係合する。ま
た、揺動板22の端部はシヤツターに設けられた
ピン16bと係合しており、この揺動板の動きに
よつてシヤツターが開閉する。なお、図において
26はスラストストツパである。 A swing plate 22 for opening and closing the shutter engages with clutches 21 and 23 by frictional force. Further, the end of the swing plate 22 is engaged with a pin 16b provided on the shutter, and the movement of the swing plate opens and closes the shutter. In addition, in the figure, 26 is a thrust stopper.
第5図はシヤツターの回動機構の正面図であ
る。図においてワイヤ巻付けプーリ20が、図示
しない駆動モータ若しくはモータとクラツチの組
み合わせにより図の矢印A方向に回転すると、ワ
イヤ17が巻かれてB方向に移動する。これによ
り原稿台が始動位置からワイヤ17と同方向即ち
B′方向(第3図)に移動し、次いで画像露光が行
なわれる。 FIG. 5 is a front view of the shutter rotation mechanism. In the figure, when the wire winding pulley 20 is rotated in the direction of arrow A in the figure by a drive motor or a combination of a motor and a clutch (not shown), the wire 17 is wound and moved in the direction B. This causes the document table to move in the same direction as the wire 17 from the starting position, that is,
It moves in the B' direction (FIG. 3), and then image exposure is performed.
このとき、揺動板22はブレーキシユー21,
23との摩擦力によつて変向プーリ18と共に図
のC方向に回転する。その結果シヤツター16は
支点16aを中心として回動し、ランプ6の光を
遮る閉状態に移行する。揺動板22はシヤツター
16を閉じた状態で装置の側板等に固定されたス
トツパピン27に当接して停止するが、変向プー
リ18はワイヤ移動に伴つて回転し続ける。 At this time, the swing plate 22 is moved by the brake shoe 21,
Due to the frictional force with 23, it rotates together with the direction change pulley 18 in the direction C in the figure. As a result, the shutter 16 rotates about the fulcrum 16a and shifts to a closed state in which the light from the lamp 6 is blocked. With the shutter 16 closed, the swing plate 22 comes into contact with a stopper pin 27 fixed to a side plate of the device and stops, but the direction change pulley 18 continues to rotate as the wire moves.
画像露光終了後、原稿台始動位置に戻すため、
原稿台の移動方向を反転させるときには、ワイヤ
巻付プーリ20をモーター或いはクラツチの反転
によつて図の矢印D方向に逆回転させる。このと
き、変向プーリ18も逆回転するので、揺動板2
2は前述と同様に摩擦力により変向プーリ18と
同方向(図のCと逆方向)回転し、その結果シヤ
ツター16を動かして開状態にする。シヤツター
16が開くと、第2図においてランプ6からの光
がコロナ放電器3のスリツト3bを介して感光体
の露光部に照射され、ブランク露光が開始する。
この状態で揺動板22は図示しない側板等に固定
されたストツパピン28に当接して停止するが、
変向プーリ18はクラツチシユー21と揺動板2
2との間でスリツプしながら回転を続ける。 After the image exposure is completed, the document platen is returned to the starting position.
When reversing the direction of movement of the document table, the wire-wound pulley 20 is reversely rotated in the direction of arrow D in the figure by reversing the motor or clutch. At this time, the direction change pulley 18 also rotates in the opposite direction, so the swing plate 2
2 rotates in the same direction as the direction change pulley 18 (in the opposite direction to C in the figure) due to frictional force, as described above, and as a result moves the shutter 16 to open. When the shutter 16 opens, the light from the lamp 6 in FIG. 2 is irradiated onto the exposed portion of the photoreceptor through the slit 3b of the corona discharger 3, and blank exposure begins.
In this state, the swing plate 22 comes into contact with a stopper pin 28 fixed to a side plate (not shown) and stops.
The direction change pulley 18 is connected to the clutch 21 and the swing plate 2.
Continue rotating while slipping between 2 and 2.
この様に、原稿台の往復移動すなわち変向プー
リの正逆転によつてシヤツターの開閉作業を行な
うと、正確なシヤツター開閉制御が達成できる。
しかも変向プーリはこの種の原稿台移動型の複写
機においては殆ど不可欠なものであるから、この
変向プーリを本発明に用いることにより、シヤツ
ター回動制御機構を簡単な構成で且つ小型化する
ことができ、空間利用の面でも有効である。ま
た、シヤツター自体の回転負荷は、かなり小さい
ので、前述の様な軽圧力の摩擦機構で実用上何ら
差支えない。 In this way, when the shutter is opened and closed by reciprocating the document table, that is, by rotating the direction change pulley in the forward and reverse directions, accurate shutter opening and closing control can be achieved.
Furthermore, since the direction change pulley is almost indispensable in this type of document table moving type copying machine, by using this direction change pulley in the present invention, the shutter rotation control mechanism can be made simple and compact. It is also effective in terms of space utilization. Furthermore, since the rotational load on the shutter itself is quite small, there is no practical problem with the light pressure friction mechanism as described above.
以上本発明の実施例の説明に当つては、原稿台
を駆動する駆動機構の変向プーリにシヤツター開
閉手段を設けた例を示したが、駆動機構とは別に
原稿台の往復移動方向の転換に同期して回転方向
の切り換わる上記変向プーリと同様な回転部材を
設け、これにシヤツター開閉手段を取付けてシヤ
ツター開閉制御を行なつてもよい。また、上記回
転手段と原稿台等の往復移動手段とを連結する手
段としては、上記実施例のワイヤの外に、ベルト
若しくは原稿台に設けたラツクと回転部材として
ピニオンを用いるなど周知の手段が使えることは
言うまでもない。 In the above description of the embodiments of the present invention, an example was shown in which a shutter opening/closing means was provided on the direction change pulley of the drive mechanism that drives the document table. A rotary member similar to the above-mentioned direction change pulley whose rotational direction is switched in synchronization with the rotation direction may be provided, and a shutter opening/closing means may be attached to this rotating member to control opening/closing of the shutter. In addition to the wire used in the above embodiments, well-known means such as a belt or a rack provided on the document table and a pinion as a rotating member may be used as a means for connecting the rotating means and the reciprocating means such as the document table. Needless to say, it can be used.
本発明は以上の様に構成したことから、感光体
に付着した現像剤とクリーニング手段との関連で
生じていた従来の問題点、更にはブランク露光を
ランプの点滅によつて行なうことによるランプの
寿命・ノイズ・画像への影響などの欠点を防止で
きる。 Since the present invention is constructed as described above, it solves the conventional problems caused by the relationship between the developer attached to the photoreceptor and the cleaning means, and furthermore solves the problems of the lamp due to the blank exposure being performed by flashing the lamp. Defects such as longevity, noise, and effects on images can be prevented.
ところで従来、シヤツター手段を電磁プランジ
ヤーに接続し、原稿台反転時の信号を電気的に取
り、電磁プランジヤーの吸着力でシヤツターを切
換える機構があるが、この場合、原稿台から電気
的に位置検出の信号を取る手段が必要で、さらに
空間的に電磁プランジヤーの場所を大きく取り、
費用も割高となる問題がある。 Conventionally, there is a mechanism in which the shutter means is connected to an electromagnetic plunger, the signal when the document platen is reversed is electrically received, and the shutter is switched by the attraction force of the electromagnetic plunger. A means of receiving the signal is required, and the electromagnetic plunger takes up a large space in terms of space.
There is also the problem of high costs.
また、原稿台にカムを取付けて該カムをシヤツ
ターの一部と係合する様に配置し、該カムの往復
移動によつて直接シヤツターを開閉させる機構も
ある。しかし、この場合、少なくとも往動の際の
始動位置に相当するカムと復動の際の始動位置に
相当するカムとが必要で、さらに原稿複写サイズ
によつて復動の反転位置を変える場合には、その
位置に相当するカムを追加しなければならない。
例えば、A4サイズとB4サイズ(共にJIS規格)の
原稿を選択的に複写する場合は、A4サイズ時に
原稿台の移動を反転させるために作動させるカム
として1つ、B4サイズ時の復動時に作動させる
カムとして1つ、および原稿露光始動時(往動
時)に作動させるカムを1つ設置しなければなら
なくなる。また、この様に同一経路上に複数個カ
ムが設けられたときには、必ず最初のカムでシヤ
ツターを作動させ、例えばB4サイズの原稿を選
択して複写する場合は、次のA4サイズ用のカム
はシヤツター手段の開閉に影響を与えない様な機
構にしなければならず、装置が複雑化することは
否めない。 There is also a mechanism in which a cam is attached to the document table and the cam is arranged to engage with a portion of the shutter, and the shutter is directly opened and closed by reciprocating the cam. However, in this case, at least a cam that corresponds to the starting position for forward movement and a cam that corresponds to the starting position for backward movement is required, and furthermore, when changing the reversing position of backward movement depending on the copy size of the document, , you must add a cam corresponding to that position.
For example, when selectively copying A4 size and B4 size documents (both JIS standards), one cam is activated to reverse the movement of the document table when the document is A4 size, and one cam is activated during the double movement when the document table is B4 size. Therefore, it is necessary to install one cam to operate the document and one cam to operate at the start of exposure of the original (during forward movement). Also, when multiple cams are installed on the same path like this, the first cam will always operate the shutter. For example, when selecting and copying a B4 size document, the next A4 size cam will be activated. It is necessary to create a mechanism that does not affect the opening and closing of the shutter means, which inevitably complicates the device.
本発明によるシヤツター手段の制御機構は、上
記の様な装置の複雑さやコスト高となる欠点がな
くしかも仮りにどこの位置で原稿台が反転しても
それに必ず追随してシヤツターを切り換えること
ができる優れた機能を有する。 The control mechanism for the shutter means according to the present invention does not have the drawbacks of complexity and high cost of the device as described above, and can switch the shutter without fail to follow the reverse position of the document table even if it is turned over at any position. Has excellent functionality.
尚、上記実施例では原稿走査用の往復移動手段
として、往復移動形の原稿台を例示したが、原稿
台が固定形の場合にはミラーやランプ等の移動部
材を利用し、これら移動部材の往復移動により、
回転部材の回転方向を変換させ、シヤツター手段
を開閉する構成としてもよい。 In the above embodiment, a reciprocating document table was used as the reciprocating means for scanning the document, but if the document table is of a fixed type, movable members such as mirrors and lamps may be used to move these movable members. Due to the round trip,
The shutter means may be opened and closed by changing the direction of rotation of the rotating member.
以上述べた様に例えば像形成走査手段が移動形
原稿台で、該原稿台が像露光工程時は、第2図に
示す様にシヤツター16は実線位置に配置される
ので、傘7のスリツト7bを通過した光は感光体
1aに対して遮断され、原稿面からの像のみ露光
される。又、ブランク露光時即ち像形成走査手段
の復帰時には、シヤツター16が破線で示される
位置に退避され、従つてスリツト3b,7bを介
し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1aの表面電位
は全面真白の原稿像を投影した時と等価となり、
それ故感光体からは電荷が消散して明暗部とも現
像剤が付着しない事になる。従つて、前述の様な
クリーニング器15の負担が増大する不都合、更
に分離爪12が現像剤で汚れる不都合等を防止で
きる。 As described above, for example, when the image forming scanning means is a movable document table and the document table is in the image exposure process, the shutter 16 is placed at the solid line position as shown in FIG. The light that has passed through is blocked by the photoreceptor 1a, and only the image from the document surface is exposed. Further, during blank exposure, that is, when the image forming scanning means returns, the shutter 16 is retracted to the position shown by the broken line, so that the light that has passed through the slits 3b and 7b covers approximately the entire width of the photoreceptor in the original image exposure area. Since the illumination is uniform, the surface potential of the photoreceptor 1a is equivalent to that when a completely white original image is projected.
Therefore, the charge is dissipated from the photoreceptor, and no developer adheres to either the bright or dark areas. Therefore, it is possible to prevent the above-mentioned disadvantages such as an increase in the burden on the cleaning device 15 and furthermore the disadvantages in which the separating claw 12 is contaminated with developer.
一方、像形成走査手段、例えば原稿台5の往動
時、即ち感光体1aに前記の如く原稿に対応する
電荷パターンを形成する為の像露光行程の時は、
第2図に示される如くシヤツター16は実線で示
される如く位置する。この時、ランプ6からの光
を導くスリツト3b,7bを通つた光が感光体1
aの露光部に入射しない様にすると共に、上記ス
リツト3b,7bを通つたランプ6からの光の一
部を常に感光体1aの露光部の原稿像用領域の外
側に入射せしめるようにする。 On the other hand, when the image forming scanning means, for example, the original platen 5, moves forward, that is, during the image exposure process for forming the charge pattern corresponding to the original on the photoreceptor 1a as described above,
As shown in FIG. 2, the shutter 16 is located as shown by the solid line. At this time, the light that has passed through the slits 3b and 7b that guide the light from the lamp 6 is transmitted to the photoreceptor 1.
A part of the light from the lamp 6 passing through the slits 3b and 7b is always allowed to enter outside the original image area of the exposure part of the photoreceptor 1a.
上記像形成走査手段の像露光工程時のシヤツタ
ー16の作用を第6図の平面図により示した。図
のランプ6のフイラメント6aの発する光はシヤ
ツター16によつて感光体1aに対して遮断され
るが、フイラメント6bから発した光の一部はシ
ヤツター16の縁端外を通過して感光体1aの画
像形成用領域Fの外側領域Eに入射する。即ちシ
ヤツター16の影が上記領域の端まで形成される
ものである。従つてランプ6と感光体1a間の距
離及びシヤツター16の位置により若干異なる
が、シヤツター16の幅としては上記領域Fの幅
と略同程度の長さを有していることがよい。尚、
上記両領域E,Fの境界部にシヤツター16の縁
端の鮮鋭な影を形成するにはシヤツター16を光
路中に入れる際、なるべく感光体1aに対して近
くなるような位置に配置することが好ましい。 The action of the shutter 16 during the image exposure process of the image forming scanning means is shown in the plan view of FIG. The light emitted by the filament 6a of the lamp 6 shown in the figure is blocked by the shutter 16 from the photoconductor 1a, but a part of the light emitted from the filament 6b passes outside the edge of the shutter 16 and is blocked by the photoconductor 1a. is incident on the outer area E of the image forming area F. That is, the shadow of the shutter 16 is formed to the end of the area. Therefore, it is preferable that the width of the shutter 16 is approximately the same as the width of the area F, although it differs slightly depending on the distance between the lamp 6 and the photoreceptor 1a and the position of the shutter 16. still,
In order to form a sharp shadow of the edge of the shutter 16 at the boundary between the two areas E and F, when the shutter 16 is placed in the optical path, it should be placed as close to the photoreceptor 1a as possible. preferable.
以上説明した実施例では、原稿照明用と感光体
の端部及びブランク露光用と同一ランプ6を兼用
して部品点数の減少を計り、これによつて構造の
簡略化と同時にコストの低減を可能にしている
が、このようなことができるのは原稿像結像光学
系として短焦点小結像素子アレイを使用したから
である。即ち、長い光路を確保するための折れ曲
つた鏡筒等をランプ6と感光体1a間に設置する
必要がなく、ランプ6と感光体1a間の距離を接
近させ得るからである。 In the embodiment described above, the same lamp 6 is used for document illumination, the end of the photoreceptor, and blank exposure, thereby reducing the number of parts, thereby simplifying the structure and reducing costs. However, this is possible because a short focus small imaging element array is used as the original image forming optical system. That is, there is no need to install a bent lens barrel or the like between the lamp 6 and the photoreceptor 1a to ensure a long optical path, and the distance between the lamp 6 and the photoreceptor 1a can be shortened.
尚、上述のように同一ランプ6を原稿照明用と
ブランク露光用に兼用する場合、ブランク露光時
にはランプの発光量を感光体に現像剤が付着しな
い程度の光量に低減させることにより原稿台やラ
ンプ近傍の光学系感光体等の昇温を防止し、また
ランプ自体の寿命を延ばすことが可能となる。 As mentioned above, when the same lamp 6 is used both for document illumination and blank exposure, the amount of light emitted by the lamp during blank exposure is reduced to a level that does not cause developer to adhere to the photoreceptor, thereby making it possible to It is possible to prevent the temperature of nearby optical system photoreceptors and the like from rising, and also to extend the life of the lamp itself.
以上、本発明は短焦点小結像素子アレイを原稿
像結像光学系として使用する場合を例にあげて述
べたが、本発明は同光学系として単眼レンズを使
用するものにも適用でき、また光源として例えば
螢光灯等のタングステンランプ以外の光源を使用
する装置にも適用できる。また、前述の実施例で
はブランク露光と感光体端部露光用照明光を、原
稿像照射部において感光体に照明した。しかし、
カールソンプロセスを採用した電子写真装置であ
れば、第1図装置の帯電器2と現像器8の間であ
ればどの位置で行つてもよいことは言うまでもな
い。 The present invention has been described above using an example in which a short-focus small imaging element array is used as a document image forming optical system, but the present invention can also be applied to an optical system that uses a monocular lens as the same optical system. It can also be applied to devices that use light sources other than tungsten lamps, such as fluorescent lamps, as the light source. Further, in the above embodiment, the photoreceptor was illuminated with illumination light for blank exposure and photoreceptor edge exposure in the original image irradiation section. but,
Needless to say, in an electrophotographic apparatus employing the Carlson process, the process may be performed at any position between the charger 2 and the developer 8 of the apparatus shown in FIG.
以上述べた本発明によれば、ブランク露光は勿
論、潜像形成時の感光体端部均一露光も簡単な構
成で可能になり、クリーニング手段の負担軽減、
現像器内のトナーが無駄に消費されないため現像
剤濃度の適正維持、転写材分離部材の汚れ防止等
が容易に効果的に行なわれるようになる。 According to the present invention described above, not only blank exposure but also uniform exposure of the end of the photoreceptor during formation of a latent image is possible with a simple configuration, which reduces the burden on cleaning means.
Since the toner in the developing device is not wasted, the developer concentration can be maintained at an appropriate level, the transfer material separation member can be prevented from becoming dirty, etc., easily and effectively.
第1図は本発明の一実施例を示す複写装置の断
面図、第2図は第1図実施例の露光部拡大断面
図、第3図は駆動ワイヤとプーリの構成を示す斜
視図、第4図はシヤツター開閉手段を設けた変向
プーリの断面図、第5図はシヤツター回動機構の
正面図、第6図は上記第1図装置の光路を模式的
に示したブランク露光光路の平面図を示す。図に
おいて、
1a……感光体、5……原稿台、6……ラン
プ、7……反射傘、7a,7b……スリツト、1
6……シヤツター、17……ワイヤ、18……変
向プーリ、20……ワイヤ巻付プーリ、22……
揺動板、を表わす。
FIG. 1 is a sectional view of a copying machine showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the exposure section of the embodiment shown in FIG. Figure 4 is a sectional view of the direction change pulley provided with the shutter opening/closing means, Figure 5 is a front view of the shutter rotation mechanism, and Figure 6 is a plan view of the blank exposure optical path schematically showing the optical path of the apparatus shown in Figure 1 above. Show the diagram. In the figure, 1a...photoreceptor, 5...document stand, 6...lamp, 7...reflector, 7a, 7b...slit, 1
6... Shutter, 17... Wire, 18... Direction change pulley, 20... Wire wrapped pulley, 22...
Represents a rocking plate.
Claims (1)
を露光する電子写真装置において、 感光体の回転軸方向に沿つて設けた光源と、該
光源と上記感光体との間に設けたシヤツター手段
と、上記原稿像を感光体上にスリツト露光する為
に作動する往復移動手段と、上記往復移動手段を
駆動するための駆動力を与える駆動手段と、上記
駆動手段により回転する回転手段であつて、上記
往復移動手段の往復移動方向の転換に同期して回
転方向の切り換わる回転手段と、上記回転手段の
回転方向変化に同期して上記に取付けられたシヤ
ツター開閉手段とを有し、上記感光体上に原稿像
を露光しない時には、上記シヤツター手段を開放
位置にして上記光源から感光体上に光を照射し、
感光体上の電位を非現像電位に保つ様にした電子
写真装置。 2 上記往復移動手段とは、原稿を載置し往復移
動する透明原稿載置台である特許請求の範囲第1
項に記載の電子写真装置。 3 上記電子写真感光体は該感光体自身の幅より
も狭い幅を画像形成用の画像領域として使用し、
又上記光源は感光体の幅全域を露光するだけの長
さを有し、上記シヤツター手段の作動に関係な
く、スリツト端部より上記光源からの光が感光体
の非画像領域を露光する特許請求の範囲第1項に
記載の電子写真装置。 4 上記光源は原稿照明用のランプである特許請
求の範囲第1項乃至第3項に記載の電子写真装
置。 5 上記光源は全面露光用のランプである特許請
求の範囲第1項乃至第3項に記載の電子写真装
置。[Scope of Claims] 1. In an electrophotographic apparatus that exposes an original image in a slit shape to an electrophotographic photoreceptor, a light source provided along the rotational axis direction of the photoreceptor, and between the light source and the photoreceptor. a shutter means provided on the photoreceptor, a reciprocating means that operates to slit-expose the document image onto the photoreceptor, a driving means for applying a driving force to drive the reciprocating means, and a reciprocating means that is rotated by the driving means. a rotating means whose rotational direction is switched in synchronization with the change in the direction of reciprocating movement of the reciprocating means; and a shutter opening/closing means attached to the above in synchronization with the change in the rotational direction of the rotating means. and when the original image is not exposed on the photoreceptor, the shutter means is set to an open position and light is irradiated from the light source onto the photoreceptor;
An electrophotographic device that maintains the potential on the photoreceptor at a non-developing potential. 2. Claim 1, wherein the reciprocating means is a transparent original placing table on which an original is placed and moved back and forth.
The electrophotographic device described in Section 1. 3. The electrophotographic photoreceptor uses a width narrower than the width of the photoreceptor itself as an image area for image formation,
The light source has a length sufficient to expose the entire width of the photoreceptor, and the light from the light source exposes the non-image area of the photoreceptor from the end of the slit regardless of the operation of the shutter means. The electrophotographic device according to item 1. 4. The electrophotographic apparatus according to claims 1 to 3, wherein the light source is a lamp for illuminating a document. 5. The electrophotographic apparatus according to claims 1 to 3, wherein the light source is a lamp for full-surface exposure.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7788078A JPS556322A (en) | 1978-06-27 | 1978-06-27 | Electrophotographic apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7788078A JPS556322A (en) | 1978-06-27 | 1978-06-27 | Electrophotographic apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS556322A JPS556322A (en) | 1980-01-17 |
JPS6224788B2 true JPS6224788B2 (en) | 1987-05-29 |
Family
ID=13646377
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7788078A Granted JPS556322A (en) | 1978-06-27 | 1978-06-27 | Electrophotographic apparatus |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS556322A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4924269A (en) * | 1987-10-28 | 1990-05-08 | Minolta Camera Kabushiki Kaisha | Original illuminating apparatus |
DE112015006766T5 (en) | 2015-08-04 | 2018-04-19 | Sumitomo Electric Industries, Ltd. | Optical connection component |
-
1978
- 1978-06-27 JP JP7788078A patent/JPS556322A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS556322A (en) | 1980-01-17 |
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