JPS60230144A - Photosensitive body and formation of two-color image - Google Patents

Abstract

PURPOSE:To obtain a sharp image without causing color mixing by laminating 3 layers of an insulating layer, a photoconductive layer, and a photochromic layer in this order from the surface to form a photosensitive body, and regulating the potentials of black parts and chromatic color parts perfectly opposite in polarity from each other. CONSTITUTION:The photosensitive body 1 consists of the insulating layer 2, the photoconductive layer 3, a transparent electrode 4, and the base 5 made of a photochromic material. The surface of the body 1 is subjected to negative primary charging with a corona charging electrode 8. At the same time, the body 1 is exposed at the same time through a blue filter 6 to the optical image of an original OR having a blue part BL and a black part BK on a white background W. The resistivity of the photoconductive layer 3 is lowered on the parts corresponding to the white background W and the blue part BL, and positive charge opposite in polarity is induced near the interface between the layer 2 and the layer 3, and the part corresponding to the black part BK has small surface charge. Next, the substrate 5 is allowed to develop color by comparatively strong exposure. A two-color latent image having zero surface potential on the part corresponding to the white background BK, and surface potentials opposite in polarity on the parts corresponding to the blue and black parts BL, BK is obtained by executing secondary charging opposite in polarity with a corona electrode 9, and exposing the backside of the body 1 to the optical image of the original OR through a yellow filter, and uniformly exposing with long wavelength light to erase color of the substrate 5.

Description

【発明の詳細な説明】 〔発明の技術分野〕 本発明は、電子写真複写機或いは電子写真技術を用いた
プリンタ等の画像形成装置に関するもので、特に２色画
像形成装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image forming apparatus such as an electrophotographic copying machine or a printer using electrophotographic technology, and particularly relates to a two-color image forming apparatus.

〔従来技術〕[Prior art]

電子写真複写機は、今日、２色或いは、多色画像による
複写の需要が増大している。Nowadays, demand for electrophotographic copying machines for copying two-color or multicolor images is increasing.

２色画像複写方法の従来のものは、一般に多色カラー複
写と同様に色数に応じたプロセスを繰り返し行っていた
。Conventional two-color image copying methods generally repeat processes according to the number of colors, similar to multicolor copying.

しかし１色数に応じたプロセスを繰り返すことは１色ず
れや、各色トナーの混色を招き易く明瞭な２色画像を得
ることは難しかった。However, repeating the process according to the number of colors tends to cause one color shift or color mixing of the toners of each color, making it difficult to obtain a clear two-color image.

そこで、これを解決するものとして、１回の静電潜像形
成工程により、２色画像を形成する方法が提案されてい
た。第１図はその一例を示す工程図である。添付図面に
従って従来例を説明すると。As a solution to this problem, a method has been proposed in which a two-color image is formed by a single electrostatic latent image forming process. FIG. 1 is a process diagram showing an example. A conventional example will be explained according to the attached drawings.

第１ｍ　（１）の工程において導電性基体ａの上に光導
電層す、絶縁層Ｃの順に積層した感光体に一様に一次帯
電９例えば、負極性帯電を行う。この時、同時にまたは
、その直後に全面露光を行う。In step 1m (1), the photoreceptor in which the photoconductive layer and the insulating layer C are laminated in this order on the conductive substrate a is uniformly subjected to primary charging 9, for example, negative polarity charging. At this time, the entire surface is exposed simultaneously or immediately thereafter.

すると、絶縁層Ｃの表面に負電荷が沈積し、絶縁Ｎｃと
光導電層すの境界付近には逆極性の正電荷が誘起される
。（ＩＩ）の工程では、逆極性の二次帯電を行いながら
赤補色フィルターＦ１を介して白地に赤色、黒色の２色
画像を有する原稿ＯＲの像を露光する。すると、白地に
対応するＷ部分にのみ赤以外の光が入射するので、その
部分の光導電Ｎｂの抵抗が下がる一方、逆極性帯電を受
けることで１表面型位はほぼ零となる。赤色に対応する
Ｒ部分及び黒色に対応するＢ部分では、絶縁層Ｃと光導
電層すの境界付近の誘起正電荷は保持されたままである
が表面が正極性に帯電されるため絶縁層Ｃの表面の負電
荷は減少する。Then, negative charges are deposited on the surface of the insulating layer C, and positive charges of opposite polarity are induced near the boundary between the insulating layer C and the photoconductive layer. In the step (II), an image of the original OR having a two-color image of red and black on a white background is exposed through a red complementary color filter F1 while performing secondary charging of opposite polarity. Then, since light other than red is incident only on the W portion corresponding to the white background, the resistance of the photoconductive Nb in that portion decreases, and on the other hand, it receives reverse polarity charge, so that the 1st surface type becomes almost zero. In the R part corresponding to red and the B part corresponding to black, the induced positive charge near the boundary between the insulating layer C and the photoconductive layer remains retained, but the surface is positively charged, so that the insulating layer C The negative charge on the surface is reduced.

（１）の工程では、原稿ＯＲの光像を今度は赤色フィル
ターＦ２を介して与えると赤色光のみがＷ及びＲ部分に
入射する。すると、Ｒ部分では。In step (1), when the optical image of the original OR is now applied through the red filter F2, only the red light enters the W and R portions. Then, in the R part.

光導電層すの抵抗が下がり、絶縁Ｎｃと光導電層すの境
界付近の誘起正電荷のうち表面に対応したもの以外は、
アース側へ逃げ１表面型位は負となる。The resistance of the photoconductive layer decreases, and the induced positive charges near the boundary between the insulating Nc and the photoconductive layer except those corresponding to the surface,
It escapes to the ground side and the 1st surface type becomes negative.

この結果、白地に対応するＷ部分の表面電位は。As a result, the surface potential of the W portion corresponding to the white background is.

零、赤色に対応するＲ部分の表面電位は、負、黒色に対
応するＢ部分の表面電位は、正という形の潜像を作る。A latent image is formed in the form of zero, the surface potential of the R portion corresponding to red is negative, and the surface potential of the B portion corresponding to black is positive.

該潜像のＲ部分に正極性の赤トナーをＢ部分に負極性の
黒トナーを与えれば、２色画像を得ることができる。By applying positive polarity red toner to the R portion of the latent image and negative polarity black toner to the B portion of the latent image, a two-color image can be obtained.

〔従来技術の問題点〕[Problems with conventional technology]

従来の２色画像形成方法では、黒色部と赤色部の電位差
が大きくとれないという短所が存在した。The conventional two-color image forming method has a disadvantage in that it is not possible to maintain a large potential difference between the black part and the red part.

また、電位的には正極性の黒色部の表面にも負電荷が残
っているため赤色トナーが付いてしまい混色が生じてい
た。更に、帯電制御を非常に厳格に行われなければなら
ず、その為の制御が大変であった。In addition, since negative charges remained on the surface of the black portion, which has a positive polarity in terms of potential, red toner was attached to the surface, resulting in color mixing. Furthermore, charging control had to be performed very strictly, which was difficult to control.

〔発明の目的〕[Purpose of the invention]

本発明は上記従来の欠点に鑑み、黒色部と有彩色部の電
位を完全な逆極性に分離できる感光体とその感光体を使
用した２色画像形成方法を提供することを目的とする。SUMMARY OF THE INVENTION In view of the above-mentioned conventional drawbacks, it is an object of the present invention to provide a photoreceptor in which the potentials of a black area and a chromatic area can be separated into completely opposite polarities, and a two-color image forming method using the photoreceptor.

〔発明の要点〕[Key points of the invention]

本発明は上記目的を達成するために、感光体の構造を表
面から順に絶縁層、光導電層、フォトクロミック材料層
の三層構造とした事を特徴とする。In order to achieve the above object, the present invention is characterized in that the photoreceptor has a three-layer structure consisting of an insulating layer, a photoconductive layer, and a photochromic material layer in order from the surface.

〔発明の実施例〕[Embodiments of the invention]

以下９図面に従って本発明の一実施例について説明する
。An embodiment of the present invention will be described below with reference to nine drawings.

第２図は２本発明の感光体１の構造を示す一部切欠断面
図である。感光体１は１表面に絶縁Ｎ２゜次に光導電Ｎ
３．透明電極４．最下層に基体５を有して構成されてい
る。FIG. 2 is a partially cutaway sectional view showing the structure of the photoreceptor 1 of the present invention. The photoreceptor 1 has an insulating layer on one surface and a photoconductive layer on the second surface.
3. Transparent electrode 4. It is configured to have a base body 5 at the bottom layer.

基体５は、フォトクロミンク材料から成り、該材料は、
光メモリ機能、すなわち可逆的発消色性を持つ高機能材
料であり、研究の対象となっている材料も有機化合物か
ら、無機化合物、或いは異種機能を持つ材料の組み合せ
によるデバイスに至るまでその種類が多く、実用的にも
将来的にも非常に大きな可能性を持った興味ある材料で
ある。The base body 5 is made of a photochromic material, and the material is
It is a highly functional material that has a photomemory function, that is, reversible color development and decolorization, and the materials that are the subject of research range from organic compounds to inorganic compounds, and even devices that combine materials with different functions. It is an interesting material with great practical and future potential.

そして、短波長光（λ−を受けることにより縁。and edges by receiving short wavelength light (λ-).

グレー等に発色し、長波長光（λ２）を受けることによ
り消色する。更に、その消色作用は、加熱することによ
り促進される。このような材料としては２例えば、Ｃａ
Ｆ２の母体結晶中に、Ｓｎ／Ｅｕを添加したものや、Ｓ
ｒＴｉＯ３の母体結晶中にＮ　ｉ　／　Ｍ　ｏを添加し
たもの等が挙げられ、いずれも短波長光により発色し、
長波長光により消色する。It develops a color such as gray and disappears when exposed to long wavelength light (λ2). Furthermore, the decoloring action is accelerated by heating. Examples of such materials include 2, for example, Ca
Those with Sn/Eu added to the F2 host crystal, and those with S
Examples include those in which Ni/Mo is added to the base crystal of rTiO3, and both of them develop color when exposed to short wavelength light.
Discolored by long wavelength light.

次に、前記のフォトクロミンク材料から成る感光体を用
いた２色画像形成方法について、第３図を用いて説明す
る。Next, a two-color image forming method using a photoreceptor made of the photochromic material described above will be explained with reference to FIG.

第３図（Ｉ）において、感光体ｌの表面をコロナ帯電極
８によって負に一次帯電する。それと同時に、原稿ＯＲ
（白地部Ｗ上に青色部ＢＬと黒色部ＢＫを有する。）像
を青フイルタ−ｂを介して露光する。すると白地対応部
と青色対応部では。In FIG. 3(I), the surface of the photoreceptor 1 is primarily negatively charged by a corona charge electrode 8. At the same time, the manuscript OR
(There is a blue part BL and a black part BK on the white background part W.) The image is exposed to light through a blue filter b. Then, in the white background corresponding part and the blue corresponding part.

光導電層３の抵抗が下がり、絶縁層２と光導電層の境界
付近に逆極性の正電荷が誘起され、絶縁層の上下に正負
一対の電荷が形成される。黒色対応部では、光照射を受
けない為、光導電層３の抵抗は高いままであり、背面誘
起電荷は注入されず。The resistance of the photoconductive layer 3 decreases, and positive charges of opposite polarity are induced near the boundary between the insulating layer 2 and the photoconductive layer, forming a pair of positive and negative charges above and below the insulating layer. In the black corresponding area, since it is not irradiated with light, the resistance of the photoconductive layer 3 remains high, and no back surface induced charge is injected.

その分、白地対応部及び青色対応部に比べ表面電荷は少
なくなる。Accordingly, the surface charge is reduced compared to the white background corresponding area and the blue background corresponding area.

また、この時比較的強い露光を与えることにより光導電
層４に吸収されなかった光は、基体５に到達し、フォト
クロミンク材料である基体５は。Also, at this time, the light that is not absorbed by the photoconductive layer 4 due to the relatively strong exposure reaches the substrate 5, which is made of a photochromic material.

この光（λ１）に反応し発色する（第３図（Ｎ５の斜線
部）。It reacts to this light (λ1) and develops a color (Fig. 3 (shaded area N5)).

次に、此の感光体１に対して第３図（ＩＩ）に示すよう
に一次帯電と逆極性の二次帯電をコロナ帯電極９により
行う。同時に、黄フィルターを介した原稿ＯＲめ光像露
光と、感光体１の裏側からの背面露光を行う。この時の
光源の波長は、フォトクロミンク反応の起らない波長λ
３　（λ１〈λ３〈λ２）に設定する。これにより、白
地対応部は電荷が中和され表面電荷は消滅し、青色対応
部は光導電層３の抵抗が高いままであり、第３図（ｒ）
における絶縁層２の背面誘起電荷を保持したまま。Next, as shown in FIG. 3(II), the photoreceptor 1 is subjected to secondary charging with a polarity opposite to the primary charging using the corona charging electrode 9. At the same time, the original OR image is exposed through a yellow filter, and the back side of the photoreceptor 1 is exposed from the back side. The wavelength of the light source at this time is the wavelength λ at which no photochromic reaction occurs.
3 (λ1<λ3<λ2). As a result, the charge in the white background corresponding area is neutralized and the surface charge disappears, and the resistance of the photoconductive layer 3 remains high in the blue background corresponding area, as shown in FIG. 3(r).
While retaining the back surface induced charge of the insulating layer 2 at .

逆極性の二次帯電が行われるため９表面の一次帯電電荷
は減少するものの完全には中和はされずに負極性電荷が
残留する。黒色対応部は、フォトクロミンク反応を起し
ておらず透明のままであるので背面露光により光導電層
３の抵抗が下がるため。Since secondary charging of opposite polarity is performed, the primary charges on the surface of 9 are reduced, but are not completely neutralized and negative charges remain. Since the black corresponding portion does not undergo a photochromic reaction and remains transparent, the resistance of the photoconductive layer 3 is lowered by back exposure.

背面電荷の注入が行われ、−次帯電による表面電荷を中
和し、さらに逆極性の正極性側に帯電される（第３図（
■））。その後、λ２の長波長光により全面露光し、さ
らに好ましくは、熱を与えることにより、フォトクロミ
ック材料である基体５は、消色し、また１表面電荷に対
応しない背面誘起電荷は、電荷注入により中和される。Back surface charge is injected to neutralize the surface charge caused by -order charging, and the surface is further charged to the positive polarity side of the opposite polarity (Figure 3 (
■)). Thereafter, by exposing the entire surface to long-wavelength light of λ2, and more preferably by applying heat, the substrate 5, which is a photochromic material, is decolorized, and the back surface induced charges that do not correspond to one surface charge are neutralized by charge injection. be harmonized.

尚、全面照射および加熱は２表面側からでも裏面側から
でも、どちら側からでも行っても良い（第３図（■））
。Incidentally, the entire surface irradiation and heating may be performed from either the front side or the back side (Fig. 3 (■)).
.

この際、加熱するｄ青色速度を増すことができる。At this time, it is possible to increase the speed of heating dblue.

この結果、感光体表面は白地対応部の表面電位は零、青
色対応部、黒色対応部は互いに逆極性の表面電位を持つ
２色潜像が得られる。As a result, a two-color latent image is obtained on the surface of the photoreceptor, with the surface potential of the area corresponding to a white background being zero, and the surface potential of the area corresponding to blue and the area corresponding to black having opposite polarities.

以上の方法によると、青色対応部と黒色対応部′の電位
が完全に逆極性となり電位差が大きくなるため、現像の
際に、電位差が少ないために起きるトナーの混色などば
な（なり、鮮明な２色画像が得られることになる。According to the above method, the potentials of the blue corresponding area and the black corresponding area' are completely opposite in polarity, and the potential difference becomes large. A two-color image will be obtained.

〔発明の効果〕〔Effect of the invention〕

以上のように構成された本発明の感光体及び感光体を用
いた２色画像形成プロセスによれば、黒色部と有色部の
電位を完全に逆極性とすることができ、電位差を大きく
取れるため、混色のない鮮明な２色画像を得る事ができ
る。According to the photoconductor of the present invention configured as described above and the two-color image forming process using the photoconductor, the potentials of the black part and the colored part can be made completely opposite in polarity, and a large potential difference can be obtained. , it is possible to obtain a clear two-color image without color mixture.

また、帯電制御を厳格に行う必要もなく、大川りな装置
を必要としない。Further, there is no need to perform strict charging control, and no Okawa-like equipment is required.

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

第１図は従来の２色画像形成プロセスを示す工程図、第
２図は本発明の感光体を示す断面図、第３図は本発明の
２色画像形成プロセスを示す工程図である。 １−−−一感光体、　２−−−絶縁層。 ３−−−−−一光導電層、　４−−−透明電極。 ５−−−−一基体、　６−−−−−一青フイルター。 ？　−−−−−−−一黄フイルター、　８．９−−−−
コロナ帯電極、　０Ｒ−−−一原稿。 ｗ　−−−−一一白地部、ＢＬ−−−−−−青色部１８
　Ｋ　−−−−−一黒色部 特許　出願人　カシオ計算機株式会社 同　上　アイ・ディ株式会社 代理人弁理士　大　菅　義　２ 第１図 第２図FIG. 1 is a process diagram showing a conventional two-color image forming process, FIG. 2 is a sectional view showing a photoreceptor of the present invention, and FIG. 3 is a process diagram showing a two-color image forming process of the present invention. 1---One photoreceptor, 2---Insulating layer. 3---One photoconductive layer, 4---Transparent electrode. 5---One substrate, 6---One blue filter. ? ---------Ikko filter, 8.9----
Corona charged electrode, 0R---1 manuscript. w---11 white background part, BL------blue part 18
K - Ikkurobe Patent Applicant: Casio Computer Co., Ltd. Same as above ID Co., Ltd. Representative Patent Attorney Yoshi Osuga 2 Figure 1 Figure 2

Claims (2)

【特許請求の範囲】[Claims] （１）表面から順に絶縁層、光導電層、フォトクロミッ
ク材料層の三層構造を有する事を特徴とする感光体。 く。(1) A photoreceptor characterized by having a three-layer structure consisting of an insulating layer, a photoconductive layer, and a photochromic material layer in order from the surface. Ku. （２）表面から順に絶縁層、光導電層、フォトクロミッ
ク材料層の三層構造を有する感光体表面側から所定極性
の一次帯電を行うと同時に第１露光を行い、続いて前記
感光体表面側から一次帯電とは逆極性の二次帯電を行う
と同時に第２露光を行い、かつ前記感光体のフォトクロ
ミック材料層を発色も消色もさせない光にて全面照射を
行い、然る後消色工程を行うことを特徴とする２色画像
形成方法。(2) A photoreceptor having a three-layer structure consisting of an insulating layer, a photoconductive layer, and a photochromic material layer in order from the surface, performs primary charging to a predetermined polarity from the surface side, and at the same time performs first exposure, and then performs first exposure from the surface side of the photoreceptor. Secondary charging with the opposite polarity to the primary charging is performed, and at the same time, second exposure is performed, and the entire surface of the photochromic material layer of the photoreceptor is irradiated with light that does not cause color development or decolorization, followed by a decolorization process. A two-color image forming method characterized by: