JPH0587827B2 - - Google Patents
Info
- Publication number
- JPH0587827B2 JPH0587827B2 JP57064602A JP6460282A JPH0587827B2 JP H0587827 B2 JPH0587827 B2 JP H0587827B2 JP 57064602 A JP57064602 A JP 57064602A JP 6460282 A JP6460282 A JP 6460282A JP H0587827 B2 JPH0587827 B2 JP H0587827B2
- Authority
- JP
- Japan
- Prior art keywords
- image
- color
- latent image
- developer
- black
- 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 - Lifetime
Links
- 108091008695 photoreceptors Proteins 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- 230000003068 static effect Effects 0.000 description 6
- 230000008030 elimination Effects 0.000 description 4
- 238000003379 elimination reaction Methods 0.000 description 4
- 230000004907 flux Effects 0.000 description 4
- 230000000295 complement effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
Description
【発明の詳細な説明】
本発明は、二色刷が可能な複写又はワードプロ
セツサのプリンタの画像形成方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image forming method for a copy or word processor printer capable of two-color printing.
本発明は、二色刷が可能な画像形成方法に於
て、二色刷時と、単色刷時の潜像階調を異ならし
めて、夫々に適応する画像再現性を一機を使い分
けて与えて常に良質なコピーを得ることを目的と
するものである。 In an image forming method capable of two-color printing, the present invention makes the latent image gradation different during two-color printing and monochrome printing, and uses one machine to provide image reproducibility suitable for each, thereby consistently providing high quality. The purpose is to obtain accurate copies.
又さらに詳しくは、二色コピー例えば黒色文字
の文章に赤ペンで訂正・注釈或は傍線のある書類
等のコピーを黒・赤二色に複写するとき、カブリ
混色がなく明瞭に表わす。単色例えば黒色の文
字・写真等の明度彩度の低い原稿のコピーをとる
場合は、文字・図面等のライン原稿はもとより写
真原稿をも含めて十分再現性が得られるように一
機に切換え利用する方法に関する。 More specifically, when copying a two-color copy, for example, a document with black text and red pen corrections, annotations, or side lines, it is clearly displayed without fogging or color mixture. When copying monochromatic originals with low brightness and saturation, such as black text and photographs, you can switch to one machine to obtain sufficient reproducibility, including not only line originals such as text and drawings, but also photographic originals. Regarding how to.
具体的に説明すると、二色機能を有する画像形
成方法に於て、二色コピー時には硬調な潜像を形
成させ、単色コピー時には軟調な潜像を形成させ
ることを特徴とする。 Specifically, in an image forming method having a two-color function, a high-contrast latent image is formed during two-color copying, and a soft-tone latent image is formed during monochrome copying.
このように潜像階調を変えることによつて上記
のような画像再現性が得られる。しかも多色機能
機に、潜像電位切換手段を付加して、その切換え
によつて容易に使い分けを可能とした点に特徴が
ある。 By changing the latent image gradation in this way, the image reproducibility described above can be obtained. Moreover, a feature is that a latent image potential switching means is added to the multi-color function machine so that it can be easily used for different purposes by switching the latent image potential switching means.
図面を参照しながら実施例を詳述する。第１図
は二色機能複写機の一例を表わすもので、１は光
導電層の表面に絶縁層を有する少なくとも三層構
成の感光体を周面に形成した感光ドラム、２は一
次帯電器、３は二次除電同時露光器、４，５は第
１・第２の現像器、６は全面露光ランプ、７は転
写除電器、８は分離ローラ、９はクリーナでこれ
等２〜９は感光ドラム１の周面にその回転方向に
沿つて順次に配置される。 Examples will be described in detail with reference to the drawings. FIG. 1 shows an example of a two-color functional copying machine, in which numeral 1 is a photosensitive drum having at least a three-layered photosensitive member having an insulating layer on the surface of a photoconductive layer, 2 is a primary charger, 3 is a secondary static elimination simultaneous exposure device, 4 and 5 are first and second developing devices, 6 is a full exposure lamp, 7 is a transfer static eliminator, 8 is a separation roller, and 9 is a cleaner, these 2 to 9 are photosensitive They are sequentially arranged on the circumferential surface of the drum 1 along its rotational direction.
１０は原稿載置台で透明なガラス・プラスチツ
ク等の板、１１は原稿照明ランプ、１２〜１５は
光像反射ミラー、１６はレンズでこれ等の光学系
で、原稿載置台の何れに拘らず原稿のスリツト露
光像を露光器３の位置で、回転する感光体１の面
に結像させる。 Reference numeral 10 denotes a document mounting table, which is a plate made of transparent glass or plastic, 11 is a document illumination lamp, 12 to 15 are optical image reflecting mirrors, and 16 is a lens, which is an optical system such as these. A slit exposure image is formed on the surface of the rotating photoreceptor 1 at the position of the exposure device 3.
１７，１８は給紙カセツト、１９，２０は給紙
ローラ、２１は現像ローラ、２２は排出トレイを
示す。 17 and 18 are paper feed cassettes, 19 and 20 are paper feed rollers, 21 is a developing roller, and 22 is a discharge tray.
今一次帯電器２で一様帯電された感光体１上に
補色フイルタ２８を通過した原稿露光を与えると
同時に二次除電器３で感光体を除電した後、準色
フイルタ２９を通過した原稿露光を与えると、感
光体表面には原稿の準色部分の潜像のみが現像可
能電位となる。 At the same time, the photoreceptor 1 uniformly charged by the primary charger 2 is exposed to the original that has passed through the complementary color filter 28, and at the same time the photoreceptor is neutralized by the secondary static eliminator 3, and then the original that has passed through the quasi-color filter 29 is exposed. When , only the latent image of the quasi-color portion of the original document has a developable potential on the surface of the photoreceptor.
この準色潜像を準色トナーを用いた現像器４で
現像する。次いで感光体表面を一様露光すると、
原稿の準色以外の部分（赤黒二色原稿の場合は黒
の部分）の潜像が現像可能電位となる。このため
黒色トナー現像器５で現像することにより赤黒二
色コピーが可能となるものである。 This quasi-color latent image is developed by a developing device 4 using quasi-color toner. Then, when the surface of the photoreceptor is uniformly exposed,
A latent image in a portion of the document other than the quasi-color portion (black portion in the case of a red-black two-color document) becomes a developable potential. Therefore, red and black two-color copying is possible by developing with the black toner developing device 5.
ところで、準色トナー現像器４の動作を止め、
感光体全面を黒色トナー現像器５で現像すると、
原稿の赤部分も黒色トナーで現像された単色コピ
ーを得ることができる。 By the way, if you stop the operation of the semi-color toner developer 4,
When the entire surface of the photoreceptor is developed with the black toner developer 5,
It is possible to obtain a monochrome copy in which the red portion of the original is also developed with black toner.
以上実施例の詳細は特開昭51−146832号公報に
開示され公知であるから、その詳細は省略する。 The details of the above embodiments are disclosed in Japanese Unexamined Patent Publication No. 146832/1983 and are well known, so the details will be omitted.
上記目的を達成するための本発明は、電子写真
感光体に原稿像を露光して静電潜像を形成し、こ
の静電潜像を黒現像剤と色現像剤により現像する
画像形成方法であつて、黒現像剤と色現像剤とに
よる２色画像と、黒現像剤のみによる単色画像の
形成が選択可能であり、単色画像の形成に際して
は、軟調な調子の現像像となる静電潜像を形成
し、一方、色画像の形成に際しては、前記単色画
像の現像像よりも硬調な調子の現像像となる静電
潜像を形成するものである。 To achieve the above object, the present invention provides an image forming method in which a document image is exposed to light on an electrophotographic photoreceptor to form an electrostatic latent image, and this electrostatic latent image is developed with a black developer and a color developer. It is possible to select between forming a two-color image using a black developer and a color developer, or a single-color image using only the black developer. On the other hand, when forming a color image, an electrostatic latent image is formed which is a developed image with a higher tone than the developed image of the monochromatic image.
第２図は潜像の階調を表わすグラフを示すもの
で、露光量（log Ｅ）と感光体表面電位Ｖの関係
を示しＥ−Ｖカーブと呼ばれる。曲線の傾きは原
稿の中間濃度部分の再現性を示し、傾きが大きい
ほど硬調の再現性を示す。第２図は曲線２−ａが
２−ｂに対し硬調であることを示している。 FIG. 2 shows a graph representing the gradation of the latent image, which shows the relationship between the exposure amount (log E) and the photoreceptor surface potential V, and is called an EV curve. The slope of the curve indicates the reproducibility of the intermediate density portion of the original, and the larger the slope, the higher the reproducibility of the high contrast. FIG. 2 shows that curve 2-a has higher contrast than curve 2-b.
二色機能装置に於て、曲線２−ａの硬調潜像に
対して第１・第２現像器４，５を用いて現像する
と、前記の黒色文字と赤色記入の原稿の二色がく
つきりして色分けされたコピーが得られる。 In a two-color function device, when the high-tone latent image of curve 2-a is developed using the first and second developing devices 4 and 5, the two colors of the original with black characters and red are combined. You will get a color-coded copy.
曲線２−ｂの軟調潜像を黒色トナー現像器５で
現像すると、ライン原稿・写真原稿が十分再現さ
れる。 When the soft-tone latent image of the curve 2-b is developed with the black toner developer 5, line originals and photographic originals are sufficiently reproduced.
上記の階調制御手段の実施例は次下の通りであ
る。 An example of the above gradation control means is as follows.
例 １
第３図は前記の二次除電同時露光器を示すもの
で、２３は放電線、２４はグリツド、２８は補色
フイルタ、２９は準色フイルタ、25は補色フイル
タ２８を通じて感光ドラム１を一様に照明する光
源、２６はその電源、２７は光量調節器である。Example 1 FIG. 3 shows the above-mentioned secondary static elimination simultaneous exposure device, in which 23 is a discharge wire, 24 is a grid, 28 is a complementary color filter, 29 is a quasi-color filter, and 25 is a complementary color filter 28. 26 is a power source thereof, and 27 is a light amount adjuster.
原画像露光と同時に一様光源２５を点燈し、そ
の光量を徐々に増すと、第２図のようにＥ−Ｖカ
ーブはＥ軸の０方向に移動し、直線領域の傾きが
緩やかに修正される。同図のカーブ２−ａは一様
光光源２５の光量０の場合を表わす。その光量を
一例として、原画像の白地部分の露光量の20％に
相当する量とした場合が２−ｂカーブでしる。 When the uniform light source 25 is turned on at the same time as the original image is exposed and the light intensity is gradually increased, the EV curve moves toward the 0 direction of the E axis as shown in Figure 2, and the slope of the straight line area is gradually corrected. be done. Curve 2-a in the figure represents the case where the amount of light from the uniform light source 25 is 0. As an example, when the amount of light is set to be equivalent to 20% of the amount of exposure of the white background portion of the original image, it is represented by the 2-b curve.
例 ２
第４図は二次除電同時露光器３に於てコロナ放
電に対する露光束分布位置をS1・S2・S3のよう
に変えることによつて潜像形成特性を変える実施
例であり、除電のコロナ分布と露光束分布がずれ
るに従い軟調となる。第４図ではS1・S3の場合
が軟調、S2の場合が硬調となる。Example 2 Figure 4 shows an example in which the latent image formation characteristics are changed by changing the exposure flux distribution position for corona discharge in the secondary static elimination simultaneous exposure device 3 as S1, S2, and S3. As the corona distribution and exposure flux distribution deviate, the tone becomes softer. In Figure 4, S1 and S3 have soft contrast, and S2 has high contrast.
露光光束S1〜S3の変化は、露光ミラー又は露
光マスタの位置を変えて容易に行うことができ
る。 The exposure light fluxes S1 to S3 can be easily changed by changing the position of the exposure mirror or the exposure master.
例 ３
第４図のようにゲリツド３０1，３０2を有する
二次除電同時露光器３に於ては、グリツドバイア
ス電圧を電源３１，３２の調整で行うことによつ
てＥ−Ｖカーブの修正ができ、露光束に一致する
部分のコロナ分布が強まるようにバイアス電圧を
変えることにより再像再現性を硬調することがで
きる。Example 3 As shown in Fig. 4, in the secondary charge removal simultaneous exposure device 3 having gerids 30 1 and 30 2 , the E-V curve can be changed by adjusting the grid bias voltage by adjusting the power supplies 31 and 32. This can be corrected, and reimage reproducibility can be enhanced by changing the bias voltage so that the corona distribution in the portion matching the exposure flux is strengthened.
例 ４
第１図に於て、一次帯電器２に6.5Vの高圧を
印加すると約600Vの暗部電位が得られ、硬調な
画像生として前記の二色コピーに適する。一次帯
電器への印加電圧を5.8KVとすると約450Vの暗
部電位の軟調画像性となり、黒色コピーに適す
る。Example 4 In FIG. 1, when a high voltage of 6.5 V is applied to the primary charger 2, a dark area potential of about 600 V is obtained, which is suitable for the above-mentioned two-color copying as a high-contrast image. If the voltage applied to the primary charger is 5.8 KV, the image quality will be soft with a dark area potential of approximately 450 V, which is suitable for black copying.
以上の何れの例に於てもＥ−Ｖカーブの変化と
第１現像器４のオン・オフだけで二色コピー、単
色コピーに変換されるから、その切換は簡単な構
成と操作で容易に行われる。 In any of the above examples, conversion to two-color copy or single-color copy is achieved simply by changing the EV curve and turning on/off the first developing device 4, so the switching is easy with a simple configuration and operation. It will be done.
第１図は本発明を適用する複写機の一例の要部
配置図、第２図は潜像階調性曲線図、第３図・第
４図は潜像階調制御手段の実施例である。
１は三層構成感光ドラム、２は一次帯電器、３
は二次除電同時露光器、２−ａは硬調曲線、２−
ｂは軟調曲線、４は準色トナー現像器、５は黒色
トナー現像器。
FIG. 1 is a layout diagram of essential parts of an example of a copying machine to which the present invention is applied, FIG. 2 is a latent image gradation curve diagram, and FIGS. 3 and 4 are examples of latent image gradation control means. . 1 is a three-layer photosensitive drum, 2 is a primary charger, and 3 is a three-layer photosensitive drum.
2-a is a secondary static elimination simultaneous exposure device, 2-a is a high contrast curve, 2-
b is a soft tone curve, 4 is a semi-color toner developer, and 5 is a black toner developer.
Claims (1)
を形成し、この静電潜像を黒現像剤と色現像剤に
より現像する画像形成方法において、 黒現像剤と色現像剤とによる２色画像と、黒現
像剤のみによる単色画像の形成が選択可能であ
り、 単色画像の形成に際しては、軟調な調子の現像
像となる静電潜像を形成し、 一方、色画像の形成に際しては、前記単色画像
の現像剤よりも硬調な調子の現像像となる静電潜
像を形成する ことを特徴とする画像形成方法。[Scope of Claims] 1. An image forming method in which a document image is exposed to light on an electrophotographic photoreceptor to form an electrostatic latent image, and this electrostatic latent image is developed with a black developer and a color developer, comprising: a black developer; It is possible to select between forming a two-color image using black developer and a single-color image using only black developer.When forming a single-color image, an electrostatic latent image with a soft tone is formed; . An image forming method, characterized in that, when forming a color image, an electrostatic latent image is formed which becomes a developed image with a higher tone than the developer for the monochrome image.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57064602A JPS58181067A (en) | 1982-04-17 | 1982-04-17 | Image forming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57064602A JPS58181067A (en) | 1982-04-17 | 1982-04-17 | Image forming method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58181067A JPS58181067A (en) | 1983-10-22 |
| JPH0587827B2 true JPH0587827B2 (en) | 1993-12-20 |
Family
ID=13262964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57064602A Granted JPS58181067A (en) | 1982-04-17 | 1982-04-17 | Image forming method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58181067A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02281271A (en) * | 1989-04-24 | 1990-11-16 | Fuji Xerox Co Ltd | Image forming device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5441502A (en) * | 1977-07-14 | 1979-04-02 | Jieemusu Jii Buraun Ando Asosh | Jacking device for excavation |
| JPS54155840A (en) * | 1978-05-30 | 1979-12-08 | Ricoh Co Ltd | Developing method in two color electrophotographic copier |
-
1982
- 1982-04-17 JP JP57064602A patent/JPS58181067A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5441502A (en) * | 1977-07-14 | 1979-04-02 | Jieemusu Jii Buraun Ando Asosh | Jacking device for excavation |
| JPS54155840A (en) * | 1978-05-30 | 1979-12-08 | Ricoh Co Ltd | Developing method in two color electrophotographic copier |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58181067A (en) | 1983-10-22 |
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