JPS6354184B2 - - Google Patents
Info
- Publication number
- JPS6354184B2 JPS6354184B2 JP55095738A JP9573880A JPS6354184B2 JP S6354184 B2 JPS6354184 B2 JP S6354184B2 JP 55095738 A JP55095738 A JP 55095738A JP 9573880 A JP9573880 A JP 9573880A JP S6354184 B2 JPS6354184 B2 JP S6354184B2
- Authority
- JP
- Japan
- Prior art keywords
- toner
- color
- light beam
- charge
- image
- 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
- 238000000034 method Methods 0.000 claims description 17
- 239000000203 mixture Substances 0.000 description 5
- 239000003086 colorant Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000758 substrate Substances 0.000 description 2
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 108091008695 photoreceptors Proteins 0.000 description 1
- 238000001454 recorded image Methods 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G13/00—Electrographic processes using a charge pattern
- G03G13/01—Electrographic processes using a charge pattern for multicoloured copies
- G03G13/013—Electrographic processes using a charge pattern for multicoloured copies characterised by the developing step, e.g. the properties of the colour developers
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
Description
【発明の詳細な説明】
本発明は電子写真方法に係り、特に二色刷り印
刷を行う二色電子写真方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrophotographic method, and more particularly to a two-color electrophotographic method for performing two-color printing.
現在、電子写真による記録方式が多方面に適応
されている。そのなかで情報信号を印字する装置
として、レーザビームプリンタといわれるものが
ある。従来のレーザビームプリンタでは最終的に
記録紙上にえられる記録像は例えば黒だけの一色
である。しかし、一般的に広く用いられるプリン
トでは、例えば伝票などの罫線の色と計算値やデ
ータの値の色とが異なる色で印刷されると極めて
印刷物が明瞭になり、理解し易くなる。また、計
算値、データ、グラフなどにおいても二色に分類
して印刷した方が理解を助けることは日常よく経
験することである。 Currently, recording methods using electrophotography are being applied in many fields. Among these, there is a device called a laser beam printer that prints information signals. In conventional laser beam printers, the final recorded image on the recording paper is of one color, for example, black. However, in commonly used prints, for example, if the ruled lines of a slip or the like are printed in a different color from the color of calculated values or data values, the print becomes extremely clear and easy to understand. Furthermore, it is a common experience that it is easier to understand calculated values, data, graphs, etc. if they are classified and printed in two colors.
そこで、本発明者らは、電子写真による二色印
刷法として第１図に示すような方法を提案した。
本発明はこのような方法に関する。図において、
基板と光導電体よりなるドラム状の記録体１を帯
電器２で例えば正に一様帯電する。次に第１の光
線３を照射して第１の静電潜像を形成し、この静
電潜像を第１の現像器４で、光をあてた所、即ち
電荷のない所にスリーブ１３上を搬送する正に帯
電した第１のトナー５を付着せしめる。即ち反転
現像を行なう。次に第２の光線６を照射して第２
の静電潜像を形成し、第２の現像器７で、第２の
光線６を照射した所に反転現像により第１のトナ
ー５とは異なる色のスリーブ１４上を搬送する正
に帯電した第２のトナー８を付着せしめる。この
ようにして記録体１上に作られた二色のトナー像
を記録紙９に帯電器１０で転写する。記録体１
は、残存するトナーをクリーナ１１で清掃せさ、
再び使用される。 Therefore, the present inventors proposed a method as shown in FIG. 1 as a two-color printing method using electrophotography.
The present invention relates to such a method. In the figure,
A drum-shaped recording medium 1 made of a substrate and a photoconductor is charged uniformly, for example, by a charger 2. Next, a first light beam 3 is irradiated to form a first electrostatic latent image, and this electrostatic latent image is transferred to a sleeve 13 by a first developing device 4 on a place irradiated with light, that is, a place where there is no electric charge. The positively charged first toner 5 conveyed thereon is deposited. That is, reversal development is performed. Next, the second light beam 6 is irradiated to produce a second light beam.
A positively charged toner is transported on a sleeve 14 of a color different from that of the first toner 5 by reversal development at the location where the second light beam 6 is irradiated with the second developing device 7. A second toner 8 is applied. The two-color toner image thus created on the recording medium 1 is transferred onto the recording paper 9 by the charger 10. Recording body 1
clean the remaining toner with cleaner 11,
used again.
さて、かかる方式で従来の現像法を用いて現像
するさい、第２の現像器で現像するときに、第１
のトナーと第２のトナーが接触するために、すで
に出来た第１のトナー画像の上に第２のトナーが
付着したり、第１のトナー画像から第１のトナー
が掻き取られて第２のトナー中に混入して現像の
たびごとに少しずつ混入トナーがふえていき、こ
の混入トナーが第２のトナー画像にも付着したり
して、第１、第２のトナー画像とも混色を呈し、
本来の色とはならないという欠点がある。このこ
とを第２図、第３図で説明する。第２図は、第１
のトナー画像の上に第２のトナーが重なる様子を
第３図は、第２のトナーに第１のトナーが蓄積さ
れていく様子を各々示す。 Now, when developing using the conventional developing method in such a system, when developing with the second developing device, the first developing device
Because the toner and the second toner come into contact with each other, the second toner may adhere to the already formed first toner image, or the first toner may be scraped off from the first toner image and the second toner image may be scraped off. The mixed toner gradually increases each time development is performed, and this mixed toner also adheres to the second toner image, causing color mixture in both the first and second toner images. ,
The disadvantage is that the color is not the original color. This will be explained with reference to FIGS. 2 and 3. Figure 2 shows the first
FIG. 3 shows how the second toner is superimposed on the toner image, and how the first toner is accumulated on the second toner.
第２図は、第１図における第１，第２トナーに
よる現像の際のトナー付着状態と記録体の電位の
様子を示すものである。細線の円は第１のトナー
を、太細の円は第２のトナーをそれぞれ示し、円
に囲まれたプラス記号はトナーの正電荷を示す。
また、V0は帯電による表面電位、VRは光照射部
の電位（残留電位）、Vtはトナー付着部の電位
（トナー電位）を各々示す。第２図イに示すよう
に、表面電位V0にコロナ帯電された記録体に第
１の光線３を照射すると照射部の電位は残留電位
とよばれるVRとなり静電潜像が形成される。こ
の静電潜像を第１のトナー５で反転現像すること
により第１のトナー５は第１の光線３の照射部に
付着し、トナー付着部の電位はVtとなる。一般
に記録体として広く使われるセレン感光体の場合
には、V0，VR，Vtはそれぞれおよそ700V，
100V，200Vとなり、第１のトナーによる現像後
も、V0−Vtは約500Vと、かなり大きな値を示
し、第２のトナーに対しても静電潜像として作用
する。従つて第２図ロに示すように、第１のトナ
ー５による現像後に記録体を第２の光線６で照射
して、照射部を第１のトナー５と同程度の電荷量
をもつ第２のトナー８で反転現像すると、第２の
トナー８は第１のトナー５の上にも一部付着し
て、第１のトナー５によるトナー画像は混色を呈
する。 FIG. 2 shows the state of toner adhesion and the potential of the recording medium during development with the first and second toners in FIG. 1. A thin circle indicates the first toner, a thick and thin circle indicates the second toner, and a plus sign surrounded by the circle indicates the positive charge of the toner.
Further, V 0 represents the surface potential due to charging, V R represents the potential of the light irradiated portion (residual potential), and V t represents the potential of the toner-attached portion (toner potential). As shown in Figure 2A, when the first light beam 3 is irradiated onto a recording medium corona-charged to a surface potential V 0 , the potential of the irradiated area becomes V R , which is called a residual potential, and an electrostatic latent image is formed. . By reversing and developing this electrostatic latent image with the first toner 5, the first toner 5 adheres to the area irradiated with the first light beam 3, and the potential of the toner adhering area becomes Vt . In the case of a selenium photoreceptor, which is commonly used as a recording medium, V 0 , V R , and V t are approximately 700 V, respectively.
100V and 200V, and even after development with the first toner, V 0 -V t shows a fairly large value of about 500V, and acts as an electrostatic latent image on the second toner as well. Therefore, as shown in FIG. 2B, after development with the first toner 5, the recording medium is irradiated with a second light beam 6, and the irradiated area is exposed to a second light beam 6 having the same amount of charge as the first toner 5. When reversal development is performed using the toner 8, the second toner 8 partially adheres to the first toner 5, and the toner image formed by the first toner 5 exhibits mixed colors.
第３図は、第１図で示した第２の現像器による
現像時の様子を示すもので、第１の現像器による
現像で第１のトナーはすでに記録体に付着してい
る。理解を容易にするために一部のトナーを大き
く図示してある。図において、記録体１は、基板
１ａ、光導電体１ｂよりなつており、反時計方向
に回転している。記録体１は正に帯電され、第１
図に示した第１の現像器４による現像で、正に帯
電した第１のトナー５が記録体１に付着してい
る。第２の現像器７に入つている二成分現像剤の
第２のトナー８で磁気ブラシ現像を行うときに、
記録体１上の第１のトナー５は、第２の現像剤に
より摺擦されて第２の現像剤に少しづつ混入して
いく。混入した第１のトナー５はしだいにちく積
されていき、ついには第２のトナーで現像すべき
所にも混入した第１のトナーが多量に付着し、第
２のトナーによるトナー画像１２は混色を呈する
ようになる。 FIG. 3 shows the state during development by the second developing device shown in FIG. 1, and the first toner has already adhered to the recording medium during development by the first developing device. Some toners are shown enlarged for ease of understanding. In the figure, a recording medium 1 consists of a substrate 1a and a photoconductor 1b, and is rotating counterclockwise. The recording medium 1 is positively charged, and the first
During development by the first developing device 4 shown in the figure, positively charged first toner 5 adheres to the recording medium 1 . When performing magnetic brush development with the second toner 8 of the two-component developer contained in the second developing device 7,
The first toner 5 on the recording medium 1 is rubbed by the second developer and gradually mixes into the second developer. The mixed first toner 5 gradually accumulates, and eventually a large amount of mixed first toner adheres to the area that should be developed with the second toner, and the toner image 12 created by the second toner is It starts to show mixed colors.
本発明は、かかる欠点に鑑みてなされたもので
あり、第２のトナーによる現像のさいに、第１の
トナー画像の上に第２のトナーが付着せず、か
つ、第２のトナーに混入する第１のトナーが現像
のたびごとにちく積しないようにして混色を呈さ
ない二色電子写真方法を提供することを目的とす
る。 The present invention has been made in view of such drawbacks, and the second toner does not adhere to the first toner image during development with the second toner, and the second toner is mixed into the second toner. It is an object of the present invention to provide a two-color electrophotographic method that prevents a first toner from piling up every time it is developed and does not cause color mixture.
この目的を達成するため、本発明は、記録体上
の静電潜像を第１、第２の現像器で各々色の異な
る第１、第２のトナーを有する二成分系の第１、
第２の現像剤で反転現像する二色電子写真方法に
おいて、前記第２のトナーの帯電々荷量を前記第
１のトナーの帯電々荷量よりも大きくすることを
特徴とする。 In order to achieve this object, the present invention develops an electrostatic latent image on a recording medium using a two-component system having first and second toners of different colors in first and second developing devices.
In the two-color electrophotographic method in which reversal development is performed using a second developer, the amount of charge of the second toner is made larger than the amount of charge of the first toner.
以下、本発明を第２図、第３図で示した従来方
法と比較して図面と共に説明する。第４図は、第
１，第２のトナーによる現像の際のトナー付着状
態と記録体の電位の様子を示すものであり、第２
図に対応している。第４図イにおいて、第１の光
線３を照射した所に第１のトナー５が反転現像に
より付着している。次に第４図ロに示すように、
第２の光線６で照射した所を第２のトナー８で反
転現像する。本発明方法により第２のトナー８は
第１のトナー５よりもキヤリアとの大きな摩擦帯
電々荷量を有している。従つて第２のトナー８は
キヤリアとのクーロンカによる結合が強まり、第
２のトナー８の帯電々荷量を第１より大きい値に
選ぶことにより、第２のトナー８は、V0−VRの
電位差をもつ第２の光線６の照射した部分には付
着するが、V0−Vtより小さい電位差をもつ第１
のトナー５が付着した所には付着しない。 Hereinafter, the present invention will be explained with reference to the drawings in comparison with the conventional method shown in FIGS. 2 and 3. FIG. 4 shows the state of toner adhesion and the potential of the recording medium during development with the first and second toners.
Corresponds to the diagram. In FIG. 4A, the first toner 5 adheres to the area irradiated with the first light beam 3 due to reversal development. Next, as shown in Figure 4 B,
The area irradiated with the second light beam 6 is reversely developed with the second toner 8. By the method of the present invention, the second toner 8 has a larger amount of triboelectric charge with the carrier than the first toner 5. Therefore, the second toner 8 has a stronger coupling with the carrier due to the coulomb force, and by selecting the amount of electrical charge of the second toner 8 to be larger than the first value, the second toner 8 has a voltage of V 0 −V R The second light beam 6, which has a potential difference of
The toner 5 does not adhere to the areas where the toner 5 has adhered.
第５図は、第２の現像器による現像時の様子を
示すものであり、第３図に対応している。図にお
いて、第２の現像器７に入つている二成分現像剤
の第２のトナー８で磁気ブラシ現像を行うとき
に、記録体１上の第１のトナー５は、第２の現像
剤により摺擦されて第２の現像剤に少しづつ混入
していく。本発明方法により第２のトナー８の帯
電々荷量は第１のトナー５より大きいので、混入
した第１のトナー５は、第２の現像剤の中で第２
のトナー８よりもキヤリアとの結合力が弱いの
で、第２の現像器による現像のさいに第２のトナ
ー８よりも静電潜像に付着しやすく、混入量がふ
えない内に第２のトナーと共に現像されていく。
すなわち、混入した第１のトナー５は、常時、少
しづつ多量の第２のトナーにまざつて使用されて
いくので、第２のトナー画像１２は混色がほとん
どない第２のトナー８の色となる。 FIG. 5 shows the state of development by the second developing device, and corresponds to FIG. 3. In the figure, when magnetic brush development is performed using the second toner 8 of the two-component developer contained in the second developing device 7, the first toner 5 on the recording medium 1 is removed by the second developer. It is rubbed and mixed into the second developer little by little. According to the method of the present invention, the amount of electrical charge of the second toner 8 is larger than that of the first toner 5, so that the mixed first toner 5 becomes the second toner in the second developer.
Since the bonding force with the carrier is weaker than that of the toner 8, it is easier to adhere to the electrostatic latent image than the second toner 8 during development with the second developing device, and the second It is developed together with toner.
That is, since the mixed first toner 5 is always mixed with a large amount of the second toner little by little, the second toner image 12 has the color of the second toner 8 with almost no color mixture. .
本発明方法においては、前記説明した第１、第
２のトナー電荷量として、例えば第１のトナーの
電荷量が10μc／ｇに対して、第２のトナーの電
荷量は15〜30μc／ｇとなるように、第２のトナ
ーの電荷量は第１のトナーの電荷量の1.5〜３倍
がよい。また、トナーの色としては、例えば第１
のトナーを黒色、第２のトナーの色を赤色とする
ように、第１のトナーの明度を第２のトナーの明
度よりも低くした方がトナーが混色した場合にも
混色がほとんど目立たなくなる。また第１の像の
上に第２の像が乗つても転写により上下が逆転す
るので重りの影響は極めて少ない。さらに、第２
の現像時のスリーブ１４と記録体１との距離が第
１の現像時のスリーブ１３と記録体１との距離よ
りも長い方が、第２の現像剤による摺擦力が弱く
なり、第２の現像器による現像時に第１のトナー
が掻き取られて第２のトナー８に混入することが
少なくなり混色は一段と減少する。そして、第１
のトナーより第２のトナーの方が電荷量が大きい
にもかかわらず、第１の同等の調子もしくは硬調
となりスレシヨールドレベルが上がり第２のトナ
ー像への第１のトナーの重なりが少なくなる。 In the method of the present invention, the first and second toner charge amounts described above are, for example, 10 μc/g for the first toner and 15 to 30 μc/g for the second toner. Therefore, the amount of charge of the second toner is preferably 1.5 to 3 times the amount of charge of the first toner. Further, as the toner color, for example, the first
If the brightness of the first toner is lower than the brightness of the second toner, such as by making the toner black and the second toner red, even if the toners are mixed, the color mixture will hardly be noticeable. Further, even if the second image is placed on top of the first image, the top and bottom are reversed due to transfer, so the influence of the weight is extremely small. Furthermore, the second
When the distance between the sleeve 14 and the recording medium 1 during the first development is longer than the distance between the sleeve 13 and the recording medium 1 during the first development, the sliding force by the second developer becomes weaker, and the second During development with the developing device, the first toner is less likely to be scraped off and mixed into the second toner 8, and color mixture is further reduced. And the first
Even though the second toner has a larger charge than the second toner, the toner has the same tone or high contrast as the first toner, the threshold level increases, and the overlap of the first toner on the second toner image decreases. .
以上説明したように、本発明によれば、二色電
子写真方法において、トナーの混色のない鮮明な
二色画像がえられる。 As described above, according to the present invention, a clear two-color image without toner color mixing can be obtained in a two-color electrophotographic method.
上記説明では現像時バイアスは印加しない場合
で述べたが、直流、交流、交流を重畳した直流の
バイアスを印加し、現像スレシヨールドレベル、
現像の調子を調整してもよく、この場合、第２の
現像器に第１の現像器より大きな電圧を加えるの
が良い。 In the above explanation, the case was described in which no bias was applied during development, but by applying a bias of DC, AC, and DC bias superimposed with AC, the development threshold level,
The condition of development may be adjusted, and in this case, it is preferable to apply a higher voltage to the second developer than to the first developer.
第１図は本発明を適用するプリント装置の概略
構成図、第２図イ，ロは記録体へのトナー付着と
電位の関係の説明図、第３図は第２のトナーに混
入する第１のトナーの説明図、第４図イ，ロは本
発明方法による記録体へのトナー付着と電位の関
係の説明図、第５図は本発明方法による第２のト
ナーに混入する第１のトナーの説明図である。
１……記録体、４……第１の現像器、５……第
１のトナー、７……第２の現像器、８……第２の
トナー。
FIG. 1 is a schematic configuration diagram of a printing apparatus to which the present invention is applied, FIGS. 4A and 4B are explanatory diagrams of the relationship between toner adhesion to a recording medium and electric potential according to the method of the present invention, and FIG. 5 is an explanatory diagram of the first toner mixed into the second toner according to the method of the present invention. FIG. 1... Recording body, 4... First developing device, 5... First toner, 7... Second developing device, 8... Second toner.
Claims (1)
線により第１の静電潜像を形成し、これを第１の
現像器のスリーブ上を搬送する第１のトナーとキ
ヤリアとからなる二成分現像剤の該第１のトナー
で反転現像し、ひき続いて第２の光線により上記
第１の静電潜像と同一極性の第２の静電潜像を形
成し、これを第２の現像器のスリーブ上を搬送す
る上記第１のトナーと同一極性で色が異なる第２
のトナーとキヤリアとからなる二成分現像剤の該
第２のトナーで反転現像する二色電子写真方法に
おいて、上記第２のトナーの帯電電荷量は、上記
第２の光線の照射した部分には上記第２のトナー
が付着するが、上記第１のトナーが付着した所に
は上記第２のトナーが付着しない程度で、かつ、
上記第１のトナーの帯電電荷量よりも大きいこと
を特徴とする二色電子写真方法。1 A first electrostatic latent image is formed on a photoconductor whose surface is uniformly charged by a first light beam, and this image is transferred from a first toner and a carrier conveyed on a sleeve of a first developer. Reversal development is performed using the first toner of a two-component developer, followed by forming a second electrostatic latent image with the same polarity as the first electrostatic latent image using a second light beam. A second toner having the same polarity as the first toner and having a different color is conveyed on the sleeve of the second developing device.
In a two-color electrophotographic method in which reversal development is performed using a second toner of a two-component developer consisting of a toner and a carrier, the amount of charge on the second toner is such that the portion irradiated with the second light beam has a charge amount of The second toner adheres, but to the extent that the second toner does not adhere to the area to which the first toner has adhered, and
A two-color electrophotographic method, characterized in that the amount of charge is greater than that of the first toner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9573880A JPS5720744A (en) | 1980-07-15 | 1980-07-15 | Method for dichromic electrophotography |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9573880A JPS5720744A (en) | 1980-07-15 | 1980-07-15 | Method for dichromic electrophotography |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5720744A JPS5720744A (en) | 1982-02-03 |
| JPS6354184B2 true JPS6354184B2 (en) | 1988-10-27 |
Family
ID=14145820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9573880A Granted JPS5720744A (en) | 1980-07-15 | 1980-07-15 | Method for dichromic electrophotography |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5720744A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58159551A (en) * | 1982-03-17 | 1983-09-21 | Fujitsu Ltd | Multicolor recording device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52106743A (en) * | 1976-03-04 | 1977-09-07 | Fujitsu Ltd | High-speed multi-color printing |
| JPS5538538A (en) * | 1978-09-11 | 1980-03-18 | Ricoh Co Ltd | Developing method in two color electrophotographic copying system |
| JPS5557864A (en) * | 1978-10-23 | 1980-04-30 | Ricoh Co Ltd | Developing method of electrophotography |
| JPS5576360A (en) * | 1978-12-05 | 1980-06-09 | Ricoh Co Ltd | Dry development system |
-
1980
- 1980-07-15 JP JP9573880A patent/JPS5720744A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52106743A (en) * | 1976-03-04 | 1977-09-07 | Fujitsu Ltd | High-speed multi-color printing |
| JPS5538538A (en) * | 1978-09-11 | 1980-03-18 | Ricoh Co Ltd | Developing method in two color electrophotographic copying system |
| JPS5557864A (en) * | 1978-10-23 | 1980-04-30 | Ricoh Co Ltd | Developing method of electrophotography |
| JPS5576360A (en) * | 1978-12-05 | 1980-06-09 | Ricoh Co Ltd | Dry development system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5720744A (en) | 1982-02-03 |
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