JPS58216269A - Picture formation device - Google Patents

Abstract

PURPOSE:To uniformize the whole area where pictures are formed and prevent the picture quality from deterioration by the unevenness of the quantity of light, by installing a correcting means which uniformize the quantity of near-infrared light on the total width of the surface of a photoconductive photosensitive body which hardly reacts to lights of short wavelengths. CONSTITUTION:A photosensitive drum 1 has a photoconductive layer of CdS, Se, etc., which hardly reacts to the light of short wavelengths. A mirror 9 is composed of non-absorbing substances of high refractive index and low refractive index which are alternately vacuum deposited on a transparent glass plate. Therefore, about 80% of the light image of an original is reflected by the colorless non-absorbing half mirror in visual light ranges. An exposure light source of near infrared 12 is composed of tungsten filament lamps 121 and a filter 122 which transmits near-infrared lights, and the lamps 121 are installed in a plural number in the direction of the revolving shaft of the drum 1 and turned on by a prescribed voltage at the time of separating and exposing each color. The light from the light source 12 is exposed upon the light image of the original under an overlapped condition through the half mirror 9 and uniformized throughout the whole area.

Description

【発明の詳細な説明】 本発明は感光体上に形成する静電潜像の階調性を改良し
た電子写真法による画１等形成装置に関し、特にカラー
複写画像において、カラーバランスの良好なカラー再現
像を可能とする装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrophotographic first image forming apparatus that improves the gradation of an electrostatic latent image formed on a photoreceptor, and particularly to a color copying image with good color balance. The present invention relates to a device that enables reproduction of images.

本出願人が既に提案した特開昭５４−７３５６号に記載
の発明は、原稿像を露光すると同時に近赤炬領域）九を
均一露光し、形成する静電潜像のγ値、即ち、原稿濃度
（ＤＯ）と渭像衣面電位（Ｖｓ）との関係によシ措かれ
る曲線の傾きを良好に制御し１階調性の優れたｌｌ！ｉ
ｌ像再現を可能とするものである。The invention described in JP-A-54-7356, which was already proposed by the present applicant, uniformly exposes the near red area (9) at the same time as exposing the original image, and the γ value of the electrostatic latent image formed, that is, the original The slope of the curve, which is determined by the relationship between the density (DO) and the image surface potential (Vs), is well controlled, resulting in excellent one-tone gradation. i
This makes it possible to reproduce the L image.

ところで上記近赤外光を得るための光源に、タングステ
ンランプを用いることができるが、感光体の全幅に複数
の点状に発光するランプを配設した場合、この感光体の
全幅に渡って均一な露光量を得ることが内錐である。特
に本発明においては、近赤外光をＩＩＩＩｌ像露光の一
部として用いるため、先細の不均一さはそのまま再生画
像の不均一さとなシ現われる。　　。By the way, a tungsten lamp can be used as a light source for obtaining the above-mentioned near-infrared light, but if a plurality of lamps that emit light in dots are arranged over the entire width of the photoreceptor, the light will be emitted uniformly over the entire width of the photoreceptor. The inner cone is to obtain a certain amount of exposure. In particular, in the present invention, since near-infrared light is used as a part of the III-image exposure, the non-uniformity of the taper directly appears as non-uniformity of the reproduced image. .

本発明の目的は、上記従来の近赤外光の均一露光におけ
る問題を解決し、階調性の十分な−品質の複写Ｉｌ！１
１１家を得る補助崩光装置を提供する。It is an object of the present invention to solve the above-mentioned problems in the conventional uniform exposure of near-infrared light, and to obtain high-quality reproductions with sufficient gradation. 1
Provides an auxiliary light disintegration device to obtain 11 lights.

上記目的を達成する不発ゆ」は、短い波長の光に反応し
にくい特性の光導電Ｉ−を有した感光体と、この感光体
に原稿像を導く光像露光手段と、この廁九手段による感
光体１ｔ１１の露光位置又はその近傍に近赤外光を導く
近赤外光ｍ元手段とを有し１この近赤外露光手段１ま近
赤外光の光量を感光体表面の全幅で均一にする九−補正
手段を有する画像形成装置にある。上Ｈ己感光体の例と
しては、ＣｄＳ。The "non-exposure device" that achieves the above purpose is a photoreceptor having a photoconductive I- characteristic that does not easily react to short wavelength light, a light image exposure means for guiding an original image onto the photoreceptor, and a light image exposure means based on this means. A near-infrared light source means for guiding near-infrared light to the exposure position of the photoreceptor 1t11 or its vicinity. (9) An image forming apparatus having a correction means. An example of a top H photoreceptor is CdS.

８ｅ等を用いたものがある。また、近赤外露光手段とし
ては、タングステンフィラメントを１つ又は一定の間隔
で感光体の幅方向に複数設けたランプ尋がある。There are some using 8e etc. Further, as a near-infrared exposure means, there is a lamp having one or more tungsten filaments arranged at regular intervals in the width direction of the photoreceptor.

以下１実施例に従って更に詳しく駅間する。The stations will be explained in more detail according to one embodiment below.

第１図は本発明を適用するカラー複写装置の説明図であ
る。感光体１゛ラム１は、導電層、　Ｃｄ８を用いた光
４電層人び衣１１１１絶縁層を基本構成とする。FIG. 1 is an explanatory diagram of a color copying apparatus to which the present invention is applied. The photoreceptor 1 has a basic structure including a conductive layer, a photoelectric layer 1111 and an insulating layer using Cd8.

原稿台ガラス２Ｆに＃１腹写すべき原稿を載置し、照明
ランプ６によりこの原稿を照明する。このガラス２下部
の走置ミラー４，５がドラム１の回転と同期し、ランプ
６とともに原稿を走査する。A #1 document to be copied is placed on the document table glass 2F, and the document is illuminated by the illumination lamp 6. The scanning mirrors 4 and 5 below the glass 2 are synchronized with the rotation of the drum 1, and together with the lamp 6 scan the document.

走査された原稿の光像は兎レンズ６、固定ミラー７、色
分解手段８及び固定ミラー９を介して更に露光スリット
１０．露光同時除竜器１１を介して感光体ドラム１面に
結像される。色分解手段８は各色分解色に応じてｔ８１
．緑８ＩＩ、赤８ｓ及びＮＤ８４の各フィルターのいず
れかが、″ｌｔ、路内に位置する様に切換可能に設けた
回転フィルタより成る。The light image of the scanned document passes through a rabbit lens 6, a fixed mirror 7, a color separation means 8, and a fixed mirror 9, and then passes through an exposure slit 10. An image is formed on one surface of the photoreceptor drum via the simultaneous exposure remover 11. The color separation means 8 performs t81 according to each color separation.
．． Each of the green 8II, red 8s, and ND84 filters is a rotary filter that is switchably provided so as to be located within the road.

第２図はミラー９周辺を拡大した部分説明図である。FIG. 2 is an enlarged partial explanatory view of the mirror 9 and its surroundings.

ミラー９は透明ガラス板上に非吸収の屈折率の高い物質
と低い物質を交互に真空蒸着しである。The mirror 9 is made by vacuum-depositing a non-absorbing material with a high refractive index and a material with a low refractive index alternately on a transparent glass plate.

これにより可視光域では無色無吸収のハーフミラ−であ
り、原稿の光像の約８０チを反射する。このミラー９の
裏側に配置した近赤外露光源１２は、タングステンラン
プ（２４Ｖ、０．５Ｗ豆球）１２１と近赤外光を透過す
るフィルター１２島とから成ｐ１このランプ１２１は感
光体ドラム１０回転軸方向に複数個並べられてあ）、各
色分Ｍ露光時に所定の点灯電圧で点灯される。近赤外露
光源１２からの光はハーフ・ミラー９（透過率約１５チ
）を介して上記原稿の電像に虫ね−Ｃ感感光ドラム１上
に無光する。As a result, it is a colorless, non-absorbing half mirror in the visible light range, and reflects about 80 inches of the light image of the original. A near-infrared exposure source 12 placed on the back side of the mirror 9 consists of a tungsten lamp (24V, 0.5W miniature bulb) 121 and a filter 12 that transmits near-infrared light. A plurality of lamps are arranged in the direction of the rotation axis (A), and are turned on at a predetermined lighting voltage during exposure for each color M. The light from the near-infrared exposure source 12 passes through a half mirror 9 (transmittance of about 15 inches) and is transmitted to the electric image of the original document onto the C photosensitive drum 1.

第１図の装置において、感光体ドラム１表面は予めブレ
ードクリーニング器１３で清掃され、次いで前臓元ラン
プ１４及び前除電器１５によシ前回のｍ像の影響が除去
され、次いで一次帯電器１６で一様帝電さね一様な表向
電位を得る。この感光体表面は原稿元輩及び近赤外光の
露光と共に、露光同時除電器１１によって除電され、続
いて全面篇元用光源１７により全面均−ｍ元が施される
。In the apparatus shown in FIG. 1, the surface of the photoreceptor drum 1 is cleaned in advance by a blade cleaner 13, then the influence of the previous m image is removed by the front internal lamp 14 and the front static eliminator 15, and then the primary charger 16 to obtain a uniform Teiden surface potential. The surface of this photoreceptor is exposed to near-infrared light and neutralized by an exposure-simultaneous static eliminator 11, and then the entire surface is uniformized by a light source 17 for editing the entire surface.

その結果、感光体表向には高いコントラストの靜′ｆｊ
ｔ潜像が形成される。As a result, there is a high contrast on the surface of the photoreceptor.
A latent image is formed.

この感光体ドラム」二のｆｌｉ像はイエｒ：ｘ　−１８
１、マゼンタ１日３．シアン１８１及びブラック１８４
の各現像器を有する現洋・手段１８の所定現像器により
色別に現像される。This photoreceptor drum's second fli image is yellow r:x-18
1. Magenta 1 day 3. Cyan 181 and black 184
Each color is developed by a predetermined developing unit 18 having each developing unit.

一方、ドラム１土のトナー像を転写する転写紙１９Ｖｉ
ローラ２０により送り出され、転写ユニット２１へ送ら
れる。この転写ユニット２１はグリッパ−２１１で転写
紙１９の先端を把持して転写紙をドラム状のユニット２
１の局面に保持する。転写紙１９は転写ユニット２１内
の転写コロナ放電器２１！によシ、背面からコロナ放電
が施されて惑うｔ体面上のトナー像が転写される。On the other hand, transfer paper 19Vi for transferring the toner image on drum 1
It is sent out by roller 20 and sent to transfer unit 21 . This transfer unit 21 grips the leading edge of the transfer paper 19 with a gripper 211 and transfers the transfer paper to a drum-shaped unit 2.
Hold in position 1. The transfer paper 19 is transferred to the transfer corona discharger 21 in the transfer unit 21! Otherwise, a corona discharge is applied from the back side and the toner image on the t-body surface is transferred.

単色コピーの場合は転写紙１９は分離除電器２１１１に
より除電された後、直ちに分離爪２１４の作動によシ転
写ユニット２１よシ分離される。一方、多色再現の場合
は再現すべき２色乃至３色の・トナー像の転写を終了す
るまで転写ユニット２１のグリッパ−２１１は開放せず
、又その間分離爪２１４も作用せずに転写紙１９を保持
する。いずれの場合も分離後の転写紙１９は搬送ベルト
２２によ如加熱ローラ定着器２６へ導かれ、転写された
現像々が加熱定着される。そして定着終了後、転写紙は
排紙トレー２４上に排紙される。In the case of monochrome copying, the transfer paper 19 is separated from the transfer unit 21 by the operation of the separation claw 214 immediately after the charge is removed by the separation charge eliminator 2111. On the other hand, in the case of multi-color reproduction, the gripper 211 of the transfer unit 21 does not open until the transfer of the two to three color toner images to be reproduced is completed, and during that time the separation claw 214 does not operate, either. Hold 19. In either case, the separated transfer paper 19 is guided by a conveyor belt 22 to a heating roller fixing device 26, where the transferred developed images are heated and fixed. After the fixing is completed, the transfer paper is discharged onto the paper discharge tray 24.

第３図は上記第１図装置の感光体ドラム１０回転軸方向
におけるドラム面の光量分布を示す。横軸は感光体ドラ
ム幅方向、及び縦軸はドラム周面での光量を表わしてい
る。FIG. 3 shows the light amount distribution on the drum surface in the direction of the rotation axis of the photosensitive drum 10 of the apparatus shown in FIG. The horizontal axis represents the width direction of the photoreceptor drum, and the vertical axis represents the amount of light on the circumferential surface of the drum.

近赤外光′ｆｉ、鯨のランプ１２ｘｉｊ、感光体ドラム
１に対して等距離に轡間隔で配置されているのにもかか
わらず、感光体ドラム」：では図示される様な中央部の
光量が両端部よシも多（なるという光量分布になる。そ
の押出と１２では、各ランプの光量のばらつき、及びラ
ンプ中のフィラメントの向きが一定でないことがち六ら
れる。実際には感光体ドラム上の画像形成幅内にＪＩＪ
ける元を分布は〜最大値と最小価で約６０〜５０％の差
を発生し、その結果、得られるコピー画像は、中央部と
両端部で濃度の差とｌ、【り画質の低下を招いてしまう
。Even though the near-infrared light 'fi, the whale lamp 12xij, and the photoconductor drum 1 are arranged at equal distances from each other, the amount of light at the center of the photoconductor drum 1 is as shown in the figure. However, the light intensity distribution becomes more intense at both ends.In the extrusion process, there are variations in the light intensity of each lamp and the direction of the filament in the lamp is not constant.In reality, the light intensity distribution on the photoreceptor drum JIJ within the image forming width of
As a result, the copy image obtained has a difference in density between the center and both ends, and a decrease in image quality. I invite you.

第４図ｔよ上記四組を解決するための本発明の実施例で
、近赤夕１ランプ１２１のドラム幅内にある両端のラン
プ近傍に反射ミラーを設置した場合の感光体ドラム曲の
光ｌ＃１イ）イＩｎ示す。FIG. 4 t shows an embodiment of the present invention for solving the above four sets, and the light of the photoreceptor drum music when reflective mirrors are installed near the lamps at both ends within the drum width of the near-infrared light 1 lamp 121. l#1 A) Indicates.

本実施例においで１１、両端のランプ１２１に対してミ
ラー２５を配設したため、第６図の光量の少ない部分の
ｙｔ、臘が増加１．、、、　、ｍ光体ドラム上の画像形
成幅の鍛大値と最小イ１６の差が約１０〜１５％程度に
押えることが口Ｊ　ｆｉｌ；となり、コピー画質を向上
することが可能となった。In this embodiment, 11. Since mirrors 25 are provided for the lamps 121 at both ends, yt and yt in the portion with low light intensity in FIG. 6 increase.1. , , , It is possible to suppress the difference between the maximum value of the image forming width on the optical drum and the minimum value of 16 to about 10 to 15%, and it is possible to improve the copy image quality. Ta.

第５図は上記反射ミラーの具体的な実施例で、ランプ１
２１の近傍に設置する反射ミラーの平面図を示す。この
ミラー２５はランプに対する角度がミラーの支持板２６
に設けた長穴２７に従って任意に変化でき１かつ固定ね
じ２８により支持板２６に対して固定可能にしである。FIG. 5 shows a concrete example of the above-mentioned reflecting mirror, and shows the lamp 1.
21 is a plan view of a reflecting mirror installed near the mirror 21. The angle of this mirror 25 with respect to the lamp is the support plate 26 of the mirror.
It can be changed arbitrarily according to the elongated hole 27 provided therein, and can be fixed to the support plate 26 with a fixing screw 28.

２９は上記ミラー２５０回転中心軸であシ、支持板２６
にミラーを回転自在に支持している。上記構成によシラ
ンブ１２１のフィラメントの角度を考慮し、ミラー２５
を任意の位置に回転させて固定する。29 is the rotation center axis of the mirror 250, and the support plate 26
The mirror is rotatably supported. With the above configuration, considering the angle of the filament of the shield 121, the mirror 25
Rotate and fix it in any position.

第６図は本発明の他の実施例で、ランプ１２１と固定ミ
ラー９（第１図）との間のスリットの開口幅を中央部と
両端部とで変化させたものである。FIG. 6 shows another embodiment of the present invention, in which the opening width of the slit between the lamp 121 and the fixed mirror 9 (FIG. 1) is varied between the center and both ends.

このスリット開口６０け固定型でも良いが、図の如（上
下独立した遮光板３１．６２に長穴６６゜３４を設け、
この長穴に設げたねじ３５，３６に　　　□より上記遮
光板３１．３２を支持板６７に対して適切な位置に固定
しても良い。This fixed type with 60 slit openings may be used, but as shown in the figure (by providing elongated holes 66° 34 in the upper and lower independent light shielding plates 31 and 62,
The light shielding plates 31 and 32 may be fixed at appropriate positions with respect to the support plate 67 using screws 35 and 36 provided in the elongated holes.

上記本発明によシ近赤外元は感光体面の画像形成域の全
域で均一化され、光量むらによる画質の低下を防止する
ことがｉｑ能となった。According to the present invention, the near-infrared light source is made uniform over the entire image forming area on the photoreceptor surface, making it possible to prevent deterioration in image quality due to uneven light intensity.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明を適用したカラー複写機の構成説明図、
第２図はＡ［赤’Ａ光諒都の部分断面図、第３図ｔま従
来のランプの光゛−を示す光量分布曲線、第４図は本発
明を適用１〜だ装置の′ｙｔ、菫分布曲線〜第５図は第
４図で述べたＩｉ射ミラーの平面図、第６図は本発明の
他の実施例を示す。 図において、１は感光体ドラム、１２１１１近赤外光源
ランプ、２５け反射ミラー、６０はスリット開口部、５
５１−３２ｔｉ丸板を示す。 出願人　キャノン株式会社 暦５品FIG. 1 is an explanatory diagram of the configuration of a color copying machine to which the present invention is applied;
Fig. 2 is a partial cross-sectional view of A [red'A light ridge], Fig. 3 is a light intensity distribution curve showing the light of a conventional lamp, and Fig. 4 is a `yt of a device to which the present invention is applied. , violet distribution curve - FIG. 5 is a plan view of the Ii radiation mirror described in FIG. 4, and FIG. 6 shows another embodiment of the present invention. In the figure, 1 is a photosensitive drum, 12111 near-infrared light source lamp, 25 reflective mirrors, 60 is a slit opening, and 5
51-32ti round plate is shown. Applicant Canon Co., Ltd. Calendar 5 Products

Claims (3)

【特許請求の範囲】[Claims] （１）短い波長の元に反応しにくい特性の元２４電層を
有した感光体と、この感光体に原稿像を専く光像無光手
段と、この露光手段による感光体向の露光位置又はその
近傍に近赤外光を導く近赤外ｉｉ！元手段とを有し、こ
の近赤外光露光手段は近赤外光の光量を感光体表面の全
幅で均一にする光量補正手段を有する画像形成装置。(1) A photoreceptor having a 24-electrode layer that does not easily react to short wavelength light, a lightless means for exclusively applying an original image to the photoreceptor, and an exposure position facing the photoreceptor by this exposure means. Or near-infrared light that guides near-infrared light ii! The near-infrared light exposure means has a light amount correction means for making the amount of near-infrared light uniform over the entire width of the surface of the photoreceptor. （２）上記″Ｉｔ、量補正手補正手段端部の近赤外光源
に取付けた反射部材である特許請求の範囲第（１）項に
記載の画像形成装置。(2) The image forming apparatus according to claim (1), wherein the "It" is a reflective member attached to the near-infrared light source at the end of the amount correction manual correction means. （３）上記光量補正手段は、中央部よりも両端部で広い
開口面積を有して近赤外光源に対して取付けたスリット
部材である特許請求の範囲第（１）項に記載の画像形成
装置。(3) Image formation according to claim (1), wherein the light amount correction means is a slit member attached to the near-infrared light source and having a wider opening area at both ends than at the center. Device.