JPS6024556A - Synthetic image forming method - Google Patents

Synthetic image forming method

Info

Publication number
JPS6024556A
JPS6024556A JP13367983A JP13367983A JPS6024556A JP S6024556 A JPS6024556 A JP S6024556A JP 13367983 A JP13367983 A JP 13367983A JP 13367983 A JP13367983 A JP 13367983A JP S6024556 A JPS6024556 A JP S6024556A
Authority
JP
Japan
Prior art keywords
image
potential
negative
latent image
composite
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP13367983A
Other languages
Japanese (ja)
Inventor
Kenjiyu Oka
岡 建樹
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Minolta Co Ltd
Original Assignee
Minolta Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP13367983A priority Critical patent/JPS6024556A/en
Priority to US06/631,834 priority patent/US4608327A/en
Publication of JPS6024556A publication Critical patent/JPS6024556A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G13/00Electrographic processes using a charge pattern
    • G03G13/22Processes involving a combination of more than one step according to groups G03G13/02 - G03G13/20
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/04Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
    • G03G15/04018Image composition, e.g. adding or superposing informations on the original image

Abstract

PURPOSE:To obtain an excellent photosensitive body having no fog by using a photosensitive body of a three layer structure constituted fundamentally of a conductive layer, a photoconductive layer and an insulating layer. CONSTITUTION:A photosensitive drum 1 is electrostatically charged uniformly, and simultaneously, a negative image is exposed by a negative latent image forming means 3. The drum 1 is charged by a destaticizing AC corona charger 5, and its surface potential is set to about zero. Thereafter, a light is irradiated uniformly by a full surface exposing lamp 7. By this light irradiation, a charge remains behind in parts A, B. As for the part A and the same B, the potential rises in accordance with each charge quantity, and the part A and the part B rise to the highest V3 and the intermediate potential of V4, respectively. On the other hand, the part C remains as V2 which is almost equal to zero. In this way, a composite electrostatic latent image consisting of a potential shown by V3 corresponding to an image part of a negative latent image, a potential shown by V4 corresponding to a background part, and three potentials shown by V2 corresponding to an image part of a positive picture is formed on the drum 1.

Description

【発明の詳細な説明】 技術分野 本発明は導電層、光導電層及び絶縁層を基本構成とする
三層構造の感光体を用いた合成像形成方法に関する。
DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a synthetic image forming method using a photoreceptor having a three-layer structure, the basic structure of which is a conductive layer, a photoconductive layer, and an insulating layer.

従来技術 近年、通常の原稿に対する露光により形成さ1する画像
に加えて、o F’rやレーザによる所謂書き込みを行
って合成像を得る複写方法が提案されている。その−例
として特開昭57.−8553号公報に示される方法が
あり、第1a図に示す通り、第l工程はまず感光体をコ
ロナチャージャによりその表面電位が(VS )となる
ように帯電する。続く第2工程は第1b図に示す如く、
帯電された上記感光体を通常のポジ原稿に対し露光する
もので、これにより画像部電位・は略(Vs )のまま
であるか非画像部は(VL)の電位にまで減衰する。次
に第3工程としてOFl”やレーザを用いて上記非画像
部に対しネガ像を露光するとその画像部分に対応して(
Vt、 )の電位はff、 l c図に示すように(V
LL)まで減衰して合成静電潜像が形成される。このよ
うにして形成された合成静電潜像は次の第4工程におい
て現像されるが、この際の現像バイアス電圧値を上記(
VL)程度に設定することにより、第1d図に示す如く
夫々の潜像に対して互いに逆極性のトナーを付着させる
BACKGROUND OF THE INVENTION In recent years, a copying method has been proposed in which a composite image is obtained by performing so-called writing using oF'r or a laser in addition to an image formed by exposing an original to light. An example of this is JP-A-57. There is a method disclosed in Japanese Patent No. 8553, and as shown in FIG. 1a, in the first step, the photoreceptor is first charged with a corona charger so that its surface potential becomes (VS). The subsequent second step is as shown in Figure 1b.
The charged photoreceptor is exposed to light for a normal positive original, and as a result, the potential of the image area remains at approximately (Vs), or the potential of the non-image area attenuates to (VL). Next, in the third step, when a negative image is exposed to the non-image area using OFl'' or a laser, a negative image (
As shown in the figure, the potential of Vt, ) is ff, lc.
LL), and a composite electrostatic latent image is formed. The composite electrostatic latent image formed in this way is developed in the next fourth step, and the developing bias voltage value at this time is set as (
By setting the toner to about VL), toners of opposite polarity are attached to each latent image as shown in FIG. 1d.

ところで−1−記複写方法にあっ−ては(VS)、(V
(1)及び(Vt、り夫々の電位が安定していることが
、カブリのないff<’1. lす」な合成像を得る上
で重要である。
By the way, in the -1- writing method, (VS), (V
It is important that the potentials of (1) and (Vt) are stable in order to obtain a fog-free composite image with ff<'1.1.

この中で常に安定した(VS )の保証は例えばスフロ
トロンチャージャを用いることにより容易に達成できる
。また、(VLL)についてもネガ像露光時の光量を充
分とすればよい。しかしながら、(VS)と(VLり間
の中間電位(VL)は感光体間の感度のばらつき、温度
依存性、更にはポジ像露光時の光風の変動等により安定
しないことが多く、このため、現像バイアス電圧値の設
定を困難としている。
Among these, guaranteeing constant stability (VS) can be easily achieved by using, for example, a Sufrotron charger. Also, regarding (VLL), the amount of light at the time of negative image exposure may be made sufficient. However, the intermediate potential (VL) between (VS) and (VL) is often unstable due to variations in sensitivity between photoreceptors, temperature dependence, and even fluctuations in light wind during positive image exposure. This makes it difficult to set the developing bias voltage value.

もっとも上記特開昭57−8553号公報においては、
上記(VL )の電位を検出してポジ像露光量を調整制
御しているが、この場合、装置自体が複雑となる。
However, in the above-mentioned Japanese Patent Application Laid-open No. 57-8553,
The positive image exposure amount is adjusted and controlled by detecting the potential (VL), but in this case, the apparatus itself becomes complicated.

また上記複写方法にあっては夫々の潜像とも略同−コン
トラストとするためには中間電位(VL)を(VS)と
(VLL)の略中間とする必要かあり、露光量を微妙に
調整しなければならないという欠点がある。加えて上記
の複写方法にあっては、ポジ像とネガ像1ijji像部
が重複して露光されたきき−は、共に消失されてしまう
か、互いの像の電位が相殺減少して低濃度のポジまたは
ネガ像しか形成されないという不都合がある。
In addition, in the copying method described above, in order to achieve approximately the same contrast for each latent image, it is necessary to set the intermediate potential (VL) approximately halfway between (VS) and (VLL), so the exposure amount must be adjusted slightly. The drawback is that you have to do it. In addition, in the above-mentioned copying method, when the positive and negative image areas are exposed overlappingly, they are either erased together, or the potentials of each image cancel each other out and decrease, creating a low-density image. The disadvantage is that only positive or negative images are formed.

発明の目的 本発明は以上の事実に鑑みて成されたものでその目的と
するところは、常に背景部の電位を一定にしてカブリの
ない良好な合成像が得られ目、っポジ像とネガ像が重な
って露光されたと゛きはネガ像を優先して良好に可視像
化讐ることのできる合成像形成方法を提供することにあ
る。
Purpose of the Invention The present invention has been made in view of the above-mentioned facts.The purpose of the present invention is to always keep the potential of the background portion constant to obtain a good composite image without fogging, and to produce a positive image and a negative image. The object of the present invention is to provide a composite image forming method that can give priority to negative images and visualize them favorably when images are exposed in an overlapping manner.

実施例 第2図は本発明に係る合成像形成方法が実施可能な複写
機の概略構成を示し、(1)は反時計方向に回転する感
光体ドラムで導電層(1a ) J:に光導電層(1b
)と透光性絶縁層(1c)を順次積層してなる三層構造
を基本構成さしている。−例としてアルミニウム導電層
上ニCdS 、 Z+i0.CdS −ncdcO3’
4ヲハインダー樹脂に分散塗布してなるものやアモルフ
ァスシリコンを用いた厚さ10〜60ミクロンの光導電
層とその上にポリエステル−フィルムやアクリル樹脂を
10〜60ミクロンの厚さに積層してなるものを用いる
こきができる。(2)は同時露光用コロナチャージャで
そのコロナ電極(2a)は直流電圧# (2b )に接
続され感光体ドラムを所定の極性に均一帯電するととも
に同時にレーザスキャナ、OF’r、発光ダイオードア
レイ等のネガ潜像形成手段(3)によりネガ像が露光さ
れるようになっている。尚、コロナチャージャ(2)は
コロトロンに限らずスコロトロンでもよく後者のものは
均、−帯電の面で非常に有効である。
Embodiment FIG. 2 shows a schematic configuration of a copying machine in which the synthetic image forming method according to the present invention can be carried out. Layer (1b
) and a transparent insulating layer (1c) are sequentially laminated to form a three-layer structure. - As an example, CdS on an aluminum conductive layer, Z+i0. CdS-ncdcO3'
4.Those made by dispersing and coating on a binder resin, or those made by laminating a photoconductive layer of 10 to 60 microns thick using amorphous silicon and a polyester film or acrylic resin to a thickness of 10 to 60 microns on top of that. Can be used as a koki. (2) is a corona charger for simultaneous exposure, and its corona electrode (2a) is connected to DC voltage # (2b) to uniformly charge the photoreceptor drum to a predetermined polarity, and at the same time, it is used for laser scanners, OF'r, light emitting diode arrays, etc. A negative image is exposed by the negative latent image forming means (3). Incidentally, the corona charger (2) is not limited to a corotron, but may also be a scorotron, and the latter is very effective in terms of uniform charging.

(4)はポジ原稿(5)をドラム(1)上に投影するた
めの光学系でレンズ(4a)及び反射ミラー(41))
 、(4C)を含み、前述したネガ潜像形成手段(3)
と合わせて合成潜像を形成する。(6)は除電用交流コ
ロナチャージャでそのコロナ電極(6a)は交流電圧源
(6b)に接続されている。また(7)は全面露光用ラ
ンプで感光体ドラム表面を均一照射するものである。
(4) is an optical system for projecting the positive original (5) onto the drum (1) (lens (4a) and reflection mirror (41))
, (4C), and the negative latent image forming means (3) described above.
Together with this, a composite latent image is formed. (6) is an AC corona charger for static elimination, and its corona electrode (6a) is connected to an AC voltage source (6b). Further, (7) is a lamp for full-surface exposure, which uniformly irradiates the surface of the photoreceptor drum.

(8)は形成された合成潜像を現像するための磁気ブラ
シ現像ローラでその現像電極に所定のバイアス電圧(v
b)を印加するに適した直流バイアス電圧源(8a)が
接続されている。ここで、ネガ像に対応する潜像は正規
現像により第1極性のトナーが、またポジ像に対応する
潜像は反転現像により第2極性のトナーが付着して現像
されるようになっている。史に(9)は異なる極性のト
ナーを夫々同一極性に揃えるための前荷電用コロナチャ
ージャ、(10)は現像された像を転写紙に転写するた
めの転写用コロナチャージャ、tll)は転写された転
写紙を感光体ドラム(1)より分離するための分離用コ
ロナチャージャ、(12)は残留トナーを除去するため
のプレードクリーナ並びに(13)は同時照射交流除電
コロナチャージャでそのコロナ電極は交流電圧源(13
a)に接続される一方、除電ランプ(13b) iこよ
り同時照射されるようになっている。
(8) is a magnetic brush developing roller for developing the formed composite latent image, and a predetermined bias voltage (v
A DC bias voltage source (8a) suitable for applying b) is connected. Here, the latent image corresponding to the negative image is developed by regular development with toner of the first polarity, and the latent image corresponding to the positive image is developed by adhering toner of the second polarity by reversal development. . In history, (9) is a pre-charging corona charger for aligning toners of different polarities to the same polarity, (10) is a transfer corona charger for transferring the developed image to transfer paper, and (tll) is a transfer corona charger for transferring the developed image to transfer paper. (12) is a blade cleaner for removing residual toner, and (13) is a simultaneous irradiation AC static neutralization corona charger whose corona electrode is connected to an AC Voltage source (13
a), while simultaneously being irradiated from the static elimination lamp (13b).

以上の構成の複写機において、本発明に係る合成像形成
方法は次のように行われる。
In the copying machine having the above configuration, the composite image forming method according to the present invention is carried out as follows.

第1工程は感光体ドラム(1)を」1記同時露光用コロ
ナチャージャ(2)で均一帯電すると同時にネガ潜像形
成手段(3)よりネガ像を露光する工程である。
The first step is a step in which the photosensitive drum (1) is uniformly charged by the simultaneous exposure corona charger (2) and at the same time a negative image is exposed by the negative latent image forming means (3).

これは第33図に示す通りで、導電層(1a)、光導電
層(11) )並びに絶縁層(IC)の三層構造の感光
体ドラム(1)を便宜皇国、fBl、IcIに三等分し
くA1部分にネガ像の画像部(光照射部)が露光され、
fBIとfc1部分は非画像部に対応するものとする。
As shown in Fig. 33, a photosensitive drum (1) with a three-layer structure consisting of a conductive layer (1a), a photoconductive layer (11)) and an insulating layer (IC) was used as a photoreceptor drum (1) in the three-layered structure of the Imperial, fBl, and IcI. The image area (light irradiation area) of the negative image is exposed to the A1 area,
It is assumed that the fBI and fc1 portions correspond to the non-image portion.

例えば正極性に帯電するものとした場合、+A1部分は
ネガ像の画像部が同時に光照射されるから絶縁層(IC
)上のiE極重電荷対応して絶縁層(IC)と光導電層
(1b)の界面に負の電荷が誘起される。一方、光照射
されないfBlと(q部分は絶縁層上の正電荷に対応し
て負電荷が導電層(la)に誘導される。
For example, if the +A1 area is positively charged, the image area of the negative image is irradiated with light at the same time, so the insulating layer (IC
) A negative charge is induced at the interface between the insulating layer (IC) and the photoconductive layer (1b) corresponding to the iE extremely heavy charge on the photoconductive layer (1b). On the other hand, in the fBl and (q portions) which are not irradiated with light, negative charges are induced into the conductive layer (la) corresponding to the positive charges on the insulating layer.

ここで+A1部分とfBI及びfc1部分では絶縁層(
I C) −I:の電荷用が静電容量の差により異なる
が、表面電位としては同じで@1工程によって感光体ド
ラム(1)は第4a図に示すように(■0)で示される
表面電位に均一帯電される。
Here, the insulating layer (
Although the charge of I C) -I: differs due to the difference in capacitance, the surface potential is the same, and the photoreceptor drum (1) is indicated by (■0) in the @1 step as shown in Figure 4a. Uniformly charged to surface potential.

続く第2工程はポジ原稿(Stを光学系(4)lこより
遂次露光する工程で、Thab図に示すようにfc1部
分にポジ原tifl+ (7)の画像部(非照射部)が
、fAlと四部分子こ非画像部(光照射部が投影される
ものとした場合、画像部に対応するIC1部分は光照射
されないので電位変化を受けずその表面電位は第4b図
に示すように(Vo)のままである。またfAI部分は
第l工程において光照射を受け絶縁層(IC)をはさむ
関係に電荷が存在するからこの第2工程で再度光照射を
受けても何ら影響を受けずその部分の表面電位は(vO
)のままである。一方、(用部分は光照射を受けること
により導電層(1a)の負電荷は絶縁層(IC)と光導
電層(1b)の界面に移動する。
The subsequent second step is a step in which the positive original (St) is sequentially exposed from the optical system (4), and as shown in the Thab diagram, the image area (non-irradiated area) of the positive original tifl+ (7) is exposed to fAl in the fc1 area. If it is assumed that the non-image area (light irradiation area) is projected on the four molecules, the IC1 area corresponding to the image area is not irradiated with light, so it does not undergo any potential change and its surface potential is as shown in Figure 4b (Vo ).Furthermore, since the fAI portion was irradiated with light in the first step and there is a charge between it and the insulating layer (IC), it will not be affected at all even if it is irradiated with light again in the second step. The surface potential of the part is (vO
) remains the same. On the other hand, the negative charge of the conductive layer (1a) moves to the interface between the insulating layer (IC) and the photoconductive layer (1b) by receiving light irradiation.

この結果、+81部分の電位は(Vt )まで低下する
As a result, the potential of the +81 portion drops to (Vt).

第3工程は」1記感光体ドラム(1)を除電用交流コロ
ナチャージャ(5)で帯電してその表向電位を略零にす
る二り稈である。つまり第3C図に示すように除電用コ
ロナチャージャ(5)で帯電すると、絶縁層(IC)表
面の正電荷は減少する一方、その減少分に対応して導電
層(1a)には正電荷が誘起される。
The third step is to charge the photoreceptor drum (1) with an AC corona charger (5) for static elimination so that its surface potential becomes approximately zero. In other words, as shown in Fig. 3C, when charged with the charge eliminating corona charger (5), the positive charge on the surface of the insulating layer (IC) decreases, while the conductive layer (1a) has a positive charge corresponding to the decrease. induced.

従って見かけ上の表面電位は第4c図に示すように略0
■に近い(v2)まで低下する。但し、+q部分につい
ては絶縁節と光導電層を間として電荷が存在していたた
め、この工程により電荷は消滅する。
Therefore, the apparent surface potential is approximately 0 as shown in Figure 4c.
It decreases to a value close to (v2). However, since charges were present between the insulating node and the photoconductive layer in the +q portion, the charges were eliminated by this step.

第4工程は全曲露光用ランプ(7)で均一光照射する工
程で、結果として光導電層(1b)を間とする電荷はな
くなる。つまりこの工程の光照射により導電層(1a)
の電荷は逃げfAl、+81部分には絶縁層(IC)を
間とする電荷が残留する。そしてfAlと+81部分は
夫々の電荷量に応じて電゛位が上昇し、fAI部分は最
も高い(v3)に、(81部分は(V4)の中間電位ま
で上昇する。一方、(q部分は第3工程において電荷消
滅したから零に略等しい(v2)のままである。こうし
て感光体ドラム上にはネガ潜像の画像部に対応する(v
3)によって表わされる電位、背景部に対応する(v4
)によって表わされる電位並びにポジ潜像の画像部に対
応する(v2)によって表わされる3値の電位からなる
合成静電潜像が形成される。しかるに各電位、特に(v
3)と(v4)は絶縁層(IC)を間とする電荷用lこ
よって定まる。
The fourth step is a step of uniformly irradiating light with a full-length exposure lamp (7), and as a result, there is no charge between the photoconductive layer (1b). In other words, the conductive layer (1a) is formed by light irradiation in this step.
The charges escape, and charges remain in the +81 portion of fAl with the insulating layer (IC) in between. The potential of the fAl and +81 parts rises according to their respective charge amounts, and the fAI part rises to the highest potential (v3), and the (81 part rises to an intermediate potential of (V4)).On the other hand, the (q part rises to an intermediate potential of (V4)). Since the charge disappeared in the third step, it remains approximately equal to zero (v2).Therefore, on the photoreceptor drum, there is a portion (v2) corresponding to the image area of the negative latent image.
3), corresponding to the background part (v4
) and a three-value potential represented by (v2) corresponding to the image portion of the positive latent image, a composite electrostatic latent image is formed. However, each potential, especially (v
3) and (v4) are determined by the charge l between the insulating layer (IC).

このことは露光量を微妙に調整しなくとも常に安定した
中間電位(v4)はもとより各画像部の安定した電位が
得られる。特に反復使用により感光体の感度が変化して
も第4工程の露光量を一定以上とすれば(v3)と(v
4)は絶縁層をはさむ電荷量にのみ依存することとなり
安定したものとなる。
This means that not only a stable intermediate potential (v4) but also a stable potential of each image portion can be obtained without delicately adjusting the exposure amount. In particular, even if the sensitivity of the photoreceptor changes due to repeated use, if the exposure amount in the fourth step is kept above a certain level, (v3) and (v3)
4) depends only on the amount of charge sandwiching the insulating layers and is stable.

すれば、(V O)ハ1000 Vl(Vt) ハ50
0 V、(V2)ハ略OV、(Vl)カ500 Vl(
V4)カ250 vテ、t)る。より解析的には絶縁層
(IC)の客年を61、光導電層(1b)の容量をG2
とすると、」1記(v3)と(v4)は次の式によって
表わされる。
Then, (V O) Ha1000 Vl(Vt) Ha50
0 V, (V2) approximately OV, (Vl) approximately 500 Vl (
V4) 250 vte, t)ru. More analytically, the year of the insulating layer (IC) is 61, and the capacitance of the photoconductive layer (1b) is G2.
Then, ``1, (v3) and (v4) are expressed by the following formula.

■3−−”u V。■3--”uV.

C1−1−C2 従って(■3)と(v4)は絶縁層と光導電層の容量C
I、C2並ひに@1工程の初期表面電位(Vo )とで
定まり、基本的に露光量さえある程度以上であれば安定
することが判る。
C1-1-C2 Therefore, (■3) and (v4) are the capacitance C of the insulating layer and photoconductive layer.
It is determined by I, C2, and the initial surface potential (Vo) of the @1 step, and it can be seen that it is basically stable as long as the exposure amount is above a certain level.

また、本発明では前述したW(l工程におけるネガ像の
画像部(A部分)と第2工程におけるポジ像の画像部の
投影位置が重複したときはネガ像を優先して形成するこ
とができる。即ち第3b図において、+q部分に加えて
iAI部分もポジ原稿(7)の画像部に対応するとした
場合、第2工程でfAI部分も光照射を受けないが、こ
のfAI部分は光照射を受ける、受けないに関係なく何
ら影響を受けない。従って第1工程におけるネガ像露光
が優先し、第4d図で示した通りの電位パターンが得ら
れる。
Furthermore, in the present invention, when the projection positions of the negative image area (portion A) in the W(l step) and the positive image area in the second step overlap, the negative image can be formed preferentially. In other words, in Fig. 3b, if the iAI part in addition to the +q part also corresponds to the image area of the positive original (7), the fAI part will not be irradiated with light in the second step; There is no influence regardless of whether it is received or not.Therefore, the negative image exposure in the first step takes priority, and the potential pattern as shown in FIG. 4d is obtained.

こうして第l乃至第4工程を経て形成された合成静電潜
像は次の第5工程において磁気ブラシ現像ローラ(8)
により直流バイアス電圧源(8a)から所定の現像バイ
アス電圧(vb )印加のドに現像される。具体的に第
4d図に示す如き3値の合成静しいかそれより幾分低く
設定するとともに、現像剤として互いに極性の異なる2
種のトナーを用い、(■2)の電位によって表わされる
ポジ像の画像部は反転現像により正極性のトナーを、ま
た(■3)の電位によって表わされるネガ像の画像部は
正規現像により負極性のトナーを付着する。尚、トナー
は夫々同色でもよいが例えば黒と赤に夫々着色されたも
のを用いれば各ポジとネガの画像部が異なる色で現像さ
れることとなり識別上好都合である。
In this way, the composite electrostatic latent image formed through the first to fourth steps is transferred to a magnetic brush developing roller (8) in the next fifth step.
Developing is performed by applying a predetermined developing bias voltage (vb) from the DC bias voltage source (8a). Specifically, as shown in Figure 4d, the three-value synthesis is set to be quiet or slightly lower, and two different polarities are used as the developer.
The positive image area represented by the potential of (■2) is developed with positive polarity toner by reversal development, and the negative image area represented by the potential of (■3) is developed with negative polarity by regular development. Adheres sexual toner. The toners may be of the same color, but if, for example, toners colored black and red are used, each positive and negative image area will be developed in a different color, which is convenient for identification.

第5工程を詳述するに、現像方法としては磁気ブラシ法
を採用す・るのが好ましく鉄粉キャリアと異なる極性に
帯電された2種のトナーからなる現像剤を用い上記現像
バイアス電圧(vb)印加の下で−1−記のように単一
の現像工程により現像してもよいし、あるいは2つの現
像装置を並設して正規現像と反転現像を分けて行っても
よい。更に正規及び反転現像を単一工程で行う場合に本
願出願人による特開昭55−32073号公報に開示さ
れている2成分現1象剤を用いることができる。この現
像剤は非磁性絶縁トナーと、該トナー摩擦帯電し抵抗値
か1012Ω・G以上と高抵抗であり粒径が約5乃至4
0ミクロンであるとともに絶縁性樹脂中に磁性微粉末を
分散してなり、11つ、その磁性微粉末の粒子全体に占
める割合が50乃至75重置火である高抵抗磁性キャリ
アとの少なくとも2つの成分から成るもので、従来のも
のに比へ特に解像力と寛容度の点て非常に優れている。
To explain the fifth step in detail, it is preferable to adopt a magnetic brush method as a developing method, using a developer consisting of an iron powder carrier and two types of toner charged with different polarities, and using the above-mentioned developing bias voltage (vb ), the development may be carried out by a single development step as in -1-, or two development devices may be installed in parallel to carry out normal development and reversal development separately. Furthermore, when regular and reversal development are performed in a single step, a two-component developer disclosed in Japanese Patent Application Laid-open No. 32073/1983 by the applicant of the present invention can be used. This developer is made of non-magnetic insulating toner and the toner is triboelectrically charged, has a high resistance value of 1012Ω・G or more, and has a particle size of about 5 to 4.
0 micron and at least two high-resistance magnetic carriers, which are made by dispersing magnetic fine powder in an insulating resin, and the ratio of the magnetic fine powder to the whole particle is 50 to 75 times. It is extremely superior to conventional products, especially in terms of resolution and tolerance.

より具体的に例えば特開昭55−41460号公報に示
される磁気ブラシ現像装置を用い、上記高抵抗磁性キャ
リアと非磁性絶縁トナーを攪拌して互いに逆極性に摩擦
帯電させ磁気ブラシ法により現像するものであるが、中
間電位(■4)に略等しいか幾分低11す1像部に、キ
ャリアはポジ潜像の画像部に夫々イー1着する。尚、こ
の現像剤にあってもキャリアとトナーを夫々異なる色に
着色しておけば識別上好都合である。
More specifically, for example, using a magnetic brush developing device disclosed in JP-A No. 55-41460, the high-resistance magnetic carrier and non-magnetic insulating toner are stirred and frictionally charged to opposite polarities, and developed by the magnetic brush method. However, the carrier is deposited on the image area of the positive latent image at a voltage approximately equal to or slightly lower than the intermediate potential (4). In this developer, it is convenient for identification if the carrier and toner are respectively colored in different colors.

こうして感光体ドラム(1)上の合成静電潜像は現像さ
れ、次に前荷電用コロナチャージャ(9)により第1工
程とは逆極性の負極性に帯電される。これは異なる極性
の2種のトナー乃至キャリアとトナーを同極に揃えるこ
とを目的とする。但し、転写が圧力や熱による場合はn
f1荷亀用コロナチャージャは不要である。続いて転写
用コロナチャージャ(lO)により転写紙背面より正の
コロナイオンを印加して転写紙上に現像された像を転写
する。転写紙はその後、分離用コロナチャージャ(11
)により分離され、図示しない定着装置によって定着さ
れて最終複写物となる。一方、感光体ドラム(1)は残
留現像剤がブレードクリーナ(12)により除去され、
続いて残留電荷が同時照射交流除電コロナチャージャ(
13)により除去される。
In this way, the composite electrostatic latent image on the photoreceptor drum (1) is developed, and then charged by the pre-charging corona charger (9) to a negative polarity opposite to that in the first step. The purpose of this is to align two types of toner or carrier with different polarities and the toner to have the same polarity. However, if the transfer is done by pressure or heat, n
A corona charger for the f1 cargo turtle is not required. Subsequently, positive corona ions are applied from the back side of the transfer paper by a transfer corona charger (lO) to transfer the developed image onto the transfer paper. The transfer paper is then placed in a separation corona charger (11
) and then fixed by a fixing device (not shown) to form the final copy. On the other hand, residual developer is removed from the photoreceptor drum (1) by a blade cleaner (12).
Subsequently, the residual charge is removed by simultaneous irradiation with an AC static elimination corona charger (
13).

第・6図は本発明に係る合成像形成方法が実施EiJ能
な複写機の別実施例を示し、第2図と同一部材について
は同一番号を付してその説明に替える。
FIG. 6 shows another embodiment of a copying machine capable of implementing the composite image forming method according to the present invention, and the same members as those in FIG. 2 are given the same numbers and their explanations will be replaced.

第6図において、(笥)、(21)は夫々ネガ像及びポ
ジ像を露光するに適した半導体レーザてポリゴンミラー
 +221により変調されて不が像は反射ミラー(23
)、(24)を介して、またポジ像は反射ミラー(25
)を介して感光体ドラム(1)上に遂次露光されるよう
になっている。半導体レーザ(2o)からのネガ像は同
時露光用スコロトロンチャージャ伽)による帯電と同時
に露光されるが、このスコロトロンチャージャ、廟はそ
のコロナ電極(26a)か交流乃至は一直流の高圧電源
(26b)に接続される一方、コロナ電極とドラム間の
グリッド電極(26C)は直流バイアス電圧源(26d
)ニ接続されている。このような構成のスコロトロンチ
ャージャにあっては直流バイアス電圧源(26)からグ
リッド電極(26C)に印加されるノくイアスミJ」ミ
(Vg)と略等しい電位に感光体ドラム(1)を均一帯
電できるという効果かある。
In FIG. 6, (21) and (21) are semiconductor lasers suitable for exposing a negative image and a positive image, respectively, and are modulated by a polygon mirror (221).
), (24), and the positive image passes through the reflecting mirror (25).
) is sequentially exposed onto the photoreceptor drum (1). The negative image from the semiconductor laser (2o) is charged and exposed at the same time by a simultaneous exposure scorotron charger (2o), but this scorotron charger (26a) is connected to its corona electrode (26a) or an AC or DC high-voltage power source ( 26b), while the grid electrode (26C) between the corona electrode and the drum is connected to a DC bias voltage source (26d
) are connected. In a scorotron charger having such a configuration, the photoreceptor drum (1) is brought to a potential approximately equal to the voltage applied to the grid electrode (26C) from the DC bias voltage source (26). It has the effect of being able to be charged uniformly.

以上の構成において、感光体ドラム(1)iま同口1閤
光用スコロトロンチヤージヤ(26)’lこより帯電さ
J”Lると同時に半導体レーザ(20)でネガ像カ≦露
)覧さ11.1直光体ドラム(1)は前述した第3a図
及び第4a図で示したように(■0)の電位やこ均一帯
電さ(する。続いて半導体レーザ(21)によってポジ
像力≦’a”i 3’6さJ”L(第3b図、第4b図
参照)、更に除電用交流コロナチャージャ(6)で帯電
される(第3C図、第4C図参照)。そして全面露光用
ランプ(7)で均一11αIAtされて合成静電潜像が
形成される。形成された合成静電潜像は続いて第5図に
も示したようにfilii 9tブラシ現像ローラ(8
)により/くイアスミ圧(vb)pJ加の下に現像され
、以下同様の工程を経てIl伝写される一方、感光体ド
ラム(1)は残留トナーと残留電荷が除去されて次の複
写に備、える。
In the above configuration, the photosensitive drum (1) is charged by the scorotron charger (26)'l for illumination, and at the same time the semiconductor laser (20) is used to view the negative image (≦exposure). 11.1 The direct light drum (1) is uniformly charged to a potential of (■0) as shown in FIGS. 3a and 4a described above.Subsequently, the semiconductor laser (21) is used to generate a positive image power. ≦'a"i 3'6J"L (see Figures 3b and 4b), and is further charged with an AC corona charger (6) for static elimination (see Figures 3C and 4C).Then, the entire surface is exposed. A composite electrostatic latent image is formed by uniformly applying 11αIAt using a filii 9t brush developing roller (8) as shown in FIG.
), the photoreceptor drum (1) is developed under the application of Iasumi pressure (VB) pJ, and is then transferred through the same process, while the remaining toner and residual charge are removed from the photoreceptor drum (1) and it is used for the next copy. Be prepared.

効 果 以上の説明から明らかなように、不発明に係る合成像形
成方法によれば、微妙な露光量の設定を必要とすること
なく常に安定した電位の合成像を得ることができ、特に
背景部の中間電位を安定させることができるのてカブリ
のない優れた合成像を得ることができる。また各工程の
条件設定も容易で構成的にも簡素である。しかもネガ像
とポジ像が重複して露光されたときはネガ像今優先して
形成することができる等、優れた効果を有する。
Effects As is clear from the above explanation, according to the uninvented composite image forming method, a composite image with a stable potential can always be obtained without the need for delicate setting of exposure amount, and in particular, it is possible to obtain a composite image with a stable potential. Since the intermediate potential of the area can be stabilized, an excellent composite image without fog can be obtained. Furthermore, the setting of conditions for each process is easy and the configuration is simple. Furthermore, when a negative image and a positive image are exposed in duplicate, the negative image can be formed preferentially, which is an excellent effect.

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

第1a図乃至第1d図は従来の合成像形成方法を示す工
程図、i’32図は本発明に係る合成像形成方法が実施
i1能な複写機の概略構成を示す図、第3a図乃至?4
3 d図は本発明の方法の工程を示す図、第4a図乃至
第4d図は第3a図乃至13C1図における電位パター
ンを示す図、第5図は現像二[稈を示す図、第6図は木
発1万に係る方法が実施jif能な複写機の別実施例を
示す図である。 (1)・・・感光体ドラム、 (1a)・・・導電層、
 (113)・・・光導電層、 (IC)・・絶縁層、
 (2)・・同時露光用コロナチャージャ、(3)・・
・ネガ品像形成手段、(6)・・・除電用交流コロナチ
ャージャ、 (7)・・・全面露光用ランプ、 (8)
・・・磁気ブラシ現イ象ローラ、(8a)・・・直流バ
イアス電圧源、 (vb )・・・現イ象Iくイアスミ
圧、 (v2)・・・ポジ像画像iJ電位、(v3)・
・・ネガ像画像部電位0、 (V4 )−rll I+
Il電(1°f0出願人ミノルタカメラ株式会社 第1a図 第tb図 第1C図 第1d図年Z図 第4a図 Vo□ θ□ 第4c図 X15図 V4 = 第6図 5 乙bX シ
1a to 1d are process diagrams showing a conventional composite image forming method, FIG. ? 4
Figure 3d is a diagram showing the steps of the method of the present invention, Figures 4a to 4d are diagrams showing the potential patterns in Figures 3a to 13C1, Figure 5 is a diagram showing the development second culm, Figure 6 1 is a diagram showing another embodiment of a copying machine capable of carrying out the method according to KIHASHI 10,000. (1)...photosensitive drum, (1a)...conductive layer,
(113)...Photoconductive layer, (IC)...Insulating layer,
(2)...Corona charger for simultaneous exposure, (3)...
・Negative image forming means, (6)...AC corona charger for static elimination, (7)...Lamp for full exposure, (8)
...magnetic brush phenomenon roller, (8a)...DC bias voltage source, (vb)...effect I, insulator pressure, (v2)...positive image iJ potential, (v3)・
...Negative image part potential 0, (V4)-rll I+
Il Electric (1° f0 Applicant Minolta Camera Co., Ltd. Figure 1a Figure tb Figure 1C Figure 1d Figure Year Z Figure 4a Figure 4a Vo□ θ□ Figure 4c

Claims (1)

【特許請求の範囲】 (1) qT1層、光導電層及び絶縁Ji!7を積層し
てなる感光体を所定の極性の表面電位に化電すると同時
にネガ像を露光する第1工程と、 該感光体に対しポジ像を露光する第2工程と、該感光体
を交流コロナチャージャによりシ11°電してその表面
電位を略零にする$3工程と、該感光体を光照射して合
成静電潜像を形成する第4工程と、 該合成静電潜像をその現像電極に所定のバイアス電圧印
加のドに現像する弔5工程とを含むことを11ス徴とす
る合成像形成方法。 (2117il記第4工程において形成される合成静電
潜像はそのポジ像画像部に対応する電位が最も低く、背
景部がそれより高い中間電位でネガ像画像部は最も高い
電位を有することを4を徴とする4’!f 1j’l請
求の範囲第1項記載の合成像形成方法。 (3)前記バイアス電圧は前記中間電位と略等−しいか
それより幾分低く設定されることを特徴とする特許請求
の範囲第2項記載の合成像形成方法3゜(4) 前記第
2工程においてポジ像の画像部が第1工程におけるネガ
像画像部と重複して露光されたときはネガ像画像部の潜
像か優先して形成されることを特徴とする特許請求の範
囲第1項記載の合成像形成方法。
[Claims] (1) qT1 layer, photoconductive layer and insulation Ji! A first step of electrifying a photoreceptor formed by laminating the photoreceptor 7 to a surface potential of a predetermined polarity and simultaneously exposing a negative image to light; a second step of exposing the photoreceptor to a positive image; and a second step of exposing the photoreceptor to an alternating current. a $3 step in which the surface potential of the photoreceptor is reduced to approximately zero by electrifying it by 11° with a corona charger; a fourth step in which the photoreceptor is irradiated with light to form a composite electrostatic latent image; and a fourth step in which the composite electrostatic latent image is 11. A method for forming a composite image, which includes a step of developing by applying a predetermined bias voltage to the developing electrode. (In the composite electrostatic latent image formed in the fourth step according to 2117il, the potential corresponding to the positive image area is the lowest, the background area has a higher intermediate potential, and the negative image area has the highest potential. 4'!f 1j'l The composite image forming method according to claim 1, characterized by 4'!f 1j'l. (3) The bias voltage is set to be approximately equal to or somewhat lower than the intermediate potential. A method for forming a composite image according to claim 2, characterized in that: (4) When the positive image area in the second step is exposed to overlap with the negative image area in the first step; 2. The composite image forming method according to claim 1, wherein a latent image in a negative image area is formed preferentially.
JP13367983A 1983-07-21 1983-07-21 Synthetic image forming method Pending JPS6024556A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP13367983A JPS6024556A (en) 1983-07-21 1983-07-21 Synthetic image forming method
US06/631,834 US4608327A (en) 1983-07-21 1984-07-17 Method of forming composite images

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13367983A JPS6024556A (en) 1983-07-21 1983-07-21 Synthetic image forming method

Publications (1)

Publication Number Publication Date
JPS6024556A true JPS6024556A (en) 1985-02-07

Family

ID=15110343

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13367983A Pending JPS6024556A (en) 1983-07-21 1983-07-21 Synthetic image forming method

Country Status (1)

Country Link
JP (1) JPS6024556A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5294962A (en) * 1991-11-08 1994-03-15 Casio Electronics Manufacturing Co., Ltd. Contact-type electroconductive brush for electrically charging an image carrier of an image forming apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5294962A (en) * 1991-11-08 1994-03-15 Casio Electronics Manufacturing Co., Ltd. Contact-type electroconductive brush for electrically charging an image carrier of an image forming apparatus

Similar Documents

Publication Publication Date Title
Pai et al. Physics of electrophotography
US5038177A (en) Selective pre-transfer corona transfer with light treatment for tri-level xerography
JPS6032192B2 (en) 3-color electrophotographic copying method
US4047945A (en) Xeroprinting master and process
EP0130787A2 (en) An electrophotographic method for the formation of two-colored images
US4608327A (en) Method of forming composite images
JPS6251469B2 (en)
US3666365A (en) Electrophotographic process and apparatus involving persistent internal polarization
JPS6024556A (en) Synthetic image forming method
JPS6024555A (en) Synthetic image forming method
JPS63172286A (en) Color electrophotographic device
JPS608852A (en) Electrophotographing method
JP2825809B2 (en) Color electrophotographic method and apparatus
JPS6355707B2 (en)
JPS5931070B2 (en) electrophotography
JPS6017464A (en) Two-color image formation method
JPS6261954B2 (en)
JPS6262350B2 (en)
JPS59123860A (en) Synthetic image copying method
JPH0428103B2 (en)
JPS58217958A (en) Electrophotographing method
JPH0128380B2 (en)
JPH0197972A (en) Four-color electrophotography
JPS638666A (en) Dichromatic copying method
JPH01170956A (en) Color electrophotographic method