JPS58116553A - Dichromatic recording device - Google Patents

Abstract

PURPOSE:To obtain a dichromatic record print of good print quality by prividing a recharging stage behind plural developing means except a final-stage developing means. CONSTITUTION:With regard to a dichromatic recording device, a two-component magnetic brush developing method is applied to the 1st development and a one-component magnetic toner developing method is applied to the 2nd development. Then, the recharging stage which uses a recharger 13 is provided behind the 1st developing device 2. A photoreceptor 1 is charged uniformly over the entire surface by an initial-stage charger 2 firstly and the exposure of a picture corresponding to red is carried out by an exposing part 3. Then, red toner charged positively is used to perform development at a developing bias voltage setting part 5 and the recharger 13 recharges the photoreceptor 1; and the exposure of the picture corresponding to black is carried out by an exposing part 6 and development is performed by a developing bias voltage setting part 8.

Description

DETAILED DESCRIPTION OF THE INVENTION (G) Technical Field of the Invention The present invention relates to a two-color recording device such as an electrostatic recording device or an electrophotographic device, and a two-component recording method for a first method.

This invention relates to a two-color recording device that uses a first-order development method for second development (#).

■Technical Background In recent years, as electronic computers have become faster, output devices such as line printers are required, as shown below.

(1) High-speed printing (2) Miniaturization of the device (3) Easy maintenance (4) No noise In order to meet these requirements, research into non-impact type line printers is underway.

In addition, printed matter from the output device is not only used to confirm information processing results as in the past, but also performs all processes such as processing, editing, and tabulation, and printed matter tends to be treated as an official 1F class (-). It is required to be able to change the color of characters, symbols, figures, etc. as necessary.

(Q. Conventional technology and problems FIG. 1 shows a schematic wall diagram of a conventional two-color recording device.

Further, FIG. 2 shows the potential levels of each process for two-color recording.

In Figure 1, the entire surface of the photoreceptor 1 is uniformly charged by the initial charger 2. The magnetic potential tl at this time is set to the initial charging potential level Vs as shown in FIG. 2(1). Next, the image 1# corresponding to the first color of the photoconductor IFi (hereinafter referred to as black)
! The exposure section 3 performs the exposure.

At this time, the potential of the photoreceptor 1 exposed by the exposure section 3 is
As shown in FIG. 2 (2), the voltage is attenuated to approximately O[v].

Thereafter, using black toner with a positive charge, the developing bias voltage Vll is set by the developing bias voltage setting section 5, and f1MK, which is slightly lower than the initial charging potential level Vs, is set as shown in FIG. 2 (3). Developing is carried out by

After complete development, toner adheres to the photoreceptor 1 in areas from which the charge has been removed, as shown in FIG. 2 (13).

Next, gmi corresponding to the second color (hereinafter referred to as red)
Exposure of * is performed by the exposure section 6. Exposure section 6 at this time
The potential of the photoreceptor 1 exposed to light is attenuated to approximately O(V) as shown in FIG. 2(4).

Next, using a toner with a positive red charge, the developing bias voltage setting section 8 sets the developing bias voltage v! +2 is set to a value slightly lower than the initial charging potential level ■$ as shown in FIG. 2 (5), and development is performed using the two-component developer 7. From K! As shown in Figure 2 (t5), red toner adheres to the removed portion of
The colored toners adhere to form a two-color toner image on the photoreceptor 1. Next, the toner image is transferred onto the recording paper 10 by the transfer means 9. Next, in the same way as the printing rod 1 process of a conventional electrophotographic apparatus, the toner image is heated and deposited on the recording paper 1°, the cleaning rod 11° is subjected to the static neutralization step 12, and the process is completed.

Two-color recording can be performed by sequentially repeating the above-mentioned one scale.

However, the conventional method has the following problems.

First, in the two-component development method, the particle size of 9 is 100 to 300.
Iron powder of about [μm] size is used as a carrier. The developer mixed with the carrier and toner is transferred to the sleeve 1 as shown in FIG.
Height d = 5 [Parrot] Wado's 8 on top of 3! ! 14, and during development, contact depth J=3 (v
It is carried out by making contact with it about itl.

In this way, in the two-component development method, development is performed by pressing and rubbing the developer against the 14-tube photoreceptor 1.

Therefore, if the setting of the contact depth of the ears 14 of the second developing device 7 is not appropriate, the image formed on the photoreceptor 1 by the first developing device 4 and the black color formed on the photoreceptor 1 when passing through the second developing device 7 are It is mechanically scraped away, resulting in destruction of the black image.

Also, after the black image is rubbed off, red toner may adhere to the surface, causing the originally black surface to become a mixture of black and red.

Figure 4 is I! In the case where black is used as the first active agent and red is used as the second active agent. It shows the relationship between the contact depth of the second developing device 7 and the developed density. As the contact depth I of the second developing device 7 increases, the density of the red color increases;
The density of the black image decreases.

This is because the black image is mechanically scraped off by the second developing device 7, and after being removed, the red toner of the second developing device 7 adheres, causing color mixing.

For this reason, the present inventors have proposed a system in which the l-component development method, which is a soft development method, is used as the @2 development method.

In this l-component development method, the diameter is about 10 (sm).

A toner having magnetic powder dispersed therein is used to form spikes of about 0.1 to 0.3 (b) on the sleeve of a developing device.

This toner does not originally have an electric charge, but during development.

Charge is injected into the toner due to electrostatic induction of latent scratches.

Development is performed. This one-component development method does not use carriers with large particle sizes like the two-component development method.
It can be said that it is an extremely soft developing method because development is performed near the point where the tip of the Mahyu toner comes into contact with the photoreceptor. Figure 5 shows the second developing device ρ when one-component Genrenho is used for the second developing device.
FIG. 3 is a diagram showing the relationship between contact depth and developer density. Red Wei has a contact depth I of 01lI! The development density near ull is 1.2
degree is obtained. At this time, the density of the black image does not change even if the contact depth of the second developing device increases, unlike in the conventional method.

This is because a soft developing method was used as the second developer, and the black image is mechanically rubbed off by the 82 developer, and red toner is then deposited, causing color mixing. 0 Therefore, if we use the l component Genrinho as the second law.

Good records can be obtained without the destruction of red or black images or color mixing.

However, this method also has the following drawbacks. In other words, in the one-component development method.

When toner is formed on a photoreceptor and then transferred to plain paper, a high-resistance toner must be used as the developer. Therefore, the latent image strength (difference between the potential of the developer and the surface potential of the photoreceptor) Fi is necessary for the toner image obtained by the one-component developer method to have a sufficient degree of deterioration.

It must be larger than in the case of two-component development.

That is, the latent flaw concentration with respect to the initial charging potential level Vs explained using FIGS. 2 obtained by
It has the disadvantage that color gIIK density unevenness occurs.

OBJECTS OF THE INVENTION In view of the above-mentioned drawbacks, an object of the present invention is to develop a method of developing a two-component image with a low required latent image intensity after the development (#'?).

By using the l-component development method, which has a high required latent image strength, the visual density that can be developed can be made to be about the same level, and it is possible to obtain two-color printed matter with good print quality. The purpose is to realize the device.

■ Structure of the Invention The object of the present invention is to charge the latent image forming medium uniformly over the entire surface, and then perform first exposure and first development using a two-component development method.
Next, in a two-color recording device that obtains a two-color record by performing a second exposure and a second development using a one-component development method,
This is achieved by providing a two-color recording apparatus characterized in that a recharging step is provided between the fourth development and the second exposure.

[F] Examples of the invention The present invention will be explained in detail using the drawings.

FIG. 6 shows a schematic diagram of a two-color recording apparatus according to the present invention.

The difference between the figure and FIG. 1 is that a recharging device 14 is provided after the first developing device 4 performs development.

The same parts as in Figure 1 are numbered.

FIG. 7 shows the relationship between latent image intensity and developed density in the Vcl component development method and the two-component development method.

@ In Figure 7, to obtain 1.0 once developed.

The two-component JI method requires a latent image intensity of about 500 (V), and the one-component development method requires a latent image intensity of about 800 V.

FIG. 8 shows the potential levels of each process of the two-color recording apparatus according to the present invention.

First, the entire surface of the photoreceptor 1 is uniformly charged by the initial charger 2 . The potential at this time is set to the initial charging potential level Vs as shown in the diagram (1) K: tjX8. Next, the exposure portion 3 of the photoreceptor 1 is exposed to IiiigI light corresponding to black. At this time, the surface area of the photoreceptor 10 exposed by the exposure section 3 attenuates to approximately 0 [■] as shown in FIG. 8(2).

Thereafter, using a black toner with a positive charge, the developing bias voltage setting section 5 sets the developing bias voltage Vllt to 8th.
As shown in FIG. 3, development is carried out by setting the initial charging potential level to a value slightly lower than 8. By carrying out development, the charge is removed and black toner adheres to the photoreceptor 1 in 9 areas as shown in FIG. 8 (13).

Next, the photoreceptor is recharged by the IFi recharger 13.

At this time, the black toner image formed on the photoconductor l by the first exposure, 1'#lf&, is recharged by the recharger 13, and the electric charge of the black toner image itself increases E7. In addition, the potential of the photoreceptor 1 under the black toner image also increases.

The potential level is as shown in FIG. The present inventors have experimentally confirmed that the black toner image is not destroyed by recharging at this time.

At this time, the recharging potential level Vs is set such that a KIm density of 1.0 or more is obtained when development is performed using the method of developing the potential Fi1 component of the photoreceptor 1.

Next, the photoreceptor 1 is exposed at both fronts corresponding to red at the exposure section 6.
It will be held in At this time, the surface potential of the photoreceptor 1 directly exposed by the exposure section 6 is approximately o as shown in FIG. 8 (5).
(V).

Next, using a red toner with a positive charge, the developing bias voltage VB2° is set to a value slightly lower than the recharging potential level Vs' as shown in FIG. 8 (6) using the developing bias voltage setting section 8. Perform development. By carrying out this development, a necessary and sufficient development density can be obtained by one-component development, and a good two-color toner image can be obtained on the photoreceptor 1.

Therefore, the good two-color toner image formed on the photoreceptor 1 is transferred to the paper 10 by the transfer means 9, and a printed matter with good print quality and no unevenness can be obtained.

0 Effects of the Invention According to the present invention, even if a two-component development method and a one-component development method are used, each of which requires different latent image intensities in order to obtain sufficient recording density for two-color toner images, the toner image can be optimally developed for each. Development can be carried out with a high latent image strength, a good two-color toner image can be obtained on the photoreceptor, and a two-color printed matter with good print quality can be obtained.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a conventional two-color recording device, FIG. 2 is a diagram showing the potential levels of each process of the two-color recording device in FIG. 1, and FIG. 3 is a diagram explaining the developing state of the developing device. . 4 and 5 are diagrams showing the relationship between contact depth and developed density, and FIG. 6 is a schematic diagram of a two-color recording apparatus according to the present invention. FIG. 7 is a diagram showing the relationship between latent image strength and developed density, and FIG. 8 is a diagram showing the potential levels of each process of the two-color recording apparatus in FIG. In the figure, 1 is a photoreceptor, 2 is an initial charger, 3.6 is an exposure section, 4. f is a developing device, 5 and 8 are developing bias installation parts, 9 is a transfer means, and 10Fi paper. 11 is a cleaning process, 12ti is a static elimination process, 13#i
It is a recharger. Mine 3 θ l 2 3 4
S (mm) Penetration 4 Penalty -0,3-θ,2-OjOθ/ 0.2 0.3 O delirium 1 stitch drift 5 [fn-] Dormitory 5 Indication of the case of Mr. Commissioner of the Patent Office in 1982. Revised Application No. 213645) 2. Name of the invention two-color memorization device 3 Person doing Supplement II Relationship with 11G11゛ - Patent applicant address 1-11, 1) 1-101 Nakahara-ku, Yozaki City, Kanagawa Prefecture
No. 5 (522) Name: Fujitsu Limited 4 Representative Director: L-11, 181111015, Naka Ig-ku, Yozaki City, Kanagawa Prefecture Akira
Hoso Rose Multicolor Recording Method 2, Claims (1) A plurality of latent image forming means for forming a latent image on a latent image forming medium, a plurality of latent image forming means for forming a latent image on the latent image forming medium, and a plurality of latent image forming means for forming a latent image on the latent image forming medium by supplying a developer. A plurality of developing means are provided corresponding to the plurality of latent image forming means to be visualized. gI′kJIg
A multicolor recording method for obtaining a multicolor record by repeating the following nine times, characterized in that a recharging step is provided after each of the plurality of developing means except for the last developing means. Recording method. (2) In the re-fluorescence step, the potential of the image area and the non-image area or only the image area is increased, and the potential of the mws and the non-image area are made to be approximately the same.
A multicolor recording method whose main feature is the presence of t. 3. Explanation of the IP #1 technical field of the invention The present invention relates to a multicolor recording method that performs multicolor recording by sequentially repeating the formation and development of a latent image on a latent scratch forming medium.
In particular, the present invention relates to a multicolor recording method in which a recharging step is provided after each developing means except the last developing means.忤) Technical Background In recent years, as electronic computers have become faster, output devices such as line printers are required to meet the following requirements. (1) High speed printing (2) Miniaturization of the device (3) Easy maintenance (4) No noise These l! In order to meet the demands of XK, the development of non-impact printing equipment is progressing. In addition, the printed matter from the output device is not only used for checking information processing results as in the past, but also for processing 2 editing. With the tendency for printed materials to be treated as official documents, there is a need to be able to change the color of characters, symbols, etc. on printed materials as necessary. 1. Prior Art and Problems In order to simplify the explanation of the present invention, a two-color recording device using the principles of electrophotography will be described below. FIG. 1 shows a schematic diagram of a conventional two-color recording device. Further, FIG. 2 shows the potential levels of each process for two-color recording. In FIG. 1, the entire surface of the photoreceptor 1#-i is uniformly charged by the initial charger 2. The potential at this time is shown in Figure 2 (as shown in υ, the initial band '14
ik level ■8. Next, the exposure section 3 performs exposure of an image corresponding to the color of the photoreceptor IHil (hereinafter referred to as black). At this time, the potential of the II & light body 1 exposed by the exposure section 3 attenuates to approximately 0 [V], as shown in FIG. 2 (2). Thereafter, using a black and positively charged toner, the developing bias voltage VBI is set to a value slightly lower than the initial charging potential level Vs as shown in FIG. 4) Perform development. By performing the development, toner adheres to the photoreceptor 1 in the portion from which the charge has been removed, as shown in FIG. 2(3)K. Next, the exposure unit 6 exposes an image corresponding to the second color (hereinafter referred to as red) K. The potential of the photoreceptor 1 exposed by the exposure unit 6 at this time is shown in FIG. 2 (4). As shown, it attenuates to 0 [■]. Next, using a toner with a positive red charge, set the developing bias voltage setting section 8 to the developing bias voltage ■l! As shown in FIG. 2(5), development is carried out by the two-component developer 7 while setting the voltage to a value slightly lower than the initial charging potential level Va. By performing development, red toner adheres to the portion from which the electric charge has been removed, as shown in FIG. Next, the toner image is transferred onto the recording paper 10 by the transfer means 9. Next, the toner image on the recording paper 10 is heated and fixed in the same manner as the printing process of a normal electrophotographic device.
After the cleaning step 11 and the static elimination step 12't-, the l step is completed.0 Two-color recording can be performed by sequentially repeating the above-mentioned steps.0 However, the above conventional method has the following problems. have First, in the two-component development method, the particle size is 100 to 300.
[μm] iron powder is used as a carrier. The developer, which is a mixture of this carrier and toner, is transferred to the sleeve 1 as shown in FIG. 3 by the magnetic force of a mag roll (not shown).
An ear 14 having a height of about d=5 [dragon] is formed on the photoreceptor 1, and during development, the spike 1114 is brought into contact with the photoreceptor 1 at a contact depth of about g=d−δ23 [dragon]. In this way, in the two-component development method, development is performed by pressing the spike 14 made of developer against the photoreceptor 1 and rubbing it. Therefore, if the setting of the contact depth 1 of the ears 14 of the second developer 7 is not appropriate, the black image formed on the photoreceptor l by the first developer 4 will be It may be mechanically scraped as it passes, resulting in destruction of the black image. FIG. 4 shows the relationship between the contact depth ε of the second developer 7 and the developer density when black is used as the first developer and red is used as the second developer. As the contact depth C of the second developing device 7 increases, the density of the red image increases, but the density of the black image decreases. This is because it will be taken over by VC. When performing two-color recording by repeating latent image formation and development,
In addition to the destruction of the black image, which is the first image, the occurrence of color mixture as shown in FIG. 5 also results in a single fold. Figure 5 (1
)I As shown in (2), when a black image is formed on the photoreceptor 1 by first performing light and color development, the image area potential V
TI has a value lower than the development bias VBI because there is an unsaturated portion of development. In this state, Fig. 5(a)t
As shown in (4), when the second repair ft and second visual image are performed, red toner adheres due to the development of the unsaturated portion Km2 of the black image, which is the first image, and color mixture occurs in the black image. For this reason, the present inventors have first proposed the application of -development as a method for preventing destruction of ml images. In this one-component development method, a toner with a diameter of about 10 μm and magnetic powder dispersed inside is used to form ears of about 0.1 to 0.3 μm on the sleeve of the developing device. . Although this toner does not originally have an electric charge, during development, an electric charge is injected into the toner due to electrostatic induction of the latent image, and development is performed. This l-component development method does not use a carrier with a large particle size like the two-component tomato method, and develops near the point where the tip of the toner comes into contact with the photoreceptor.
It can be said that this is an extremely soft developing method. Stripe diagram 6 is a diagram illustrating the relationship between the contact depth C of the second developing device and the current W*armpit when a one-component developing method is used for the second developing device. For a black image, when the contact depth °C is around 0 (+ai + 3), the developed density will be underestimated by about 1.2. At this time, the density of the red image is Fi 2nd tax g # profit tangent 7S! Ill depth C becomes larger. This is because a soft developing method is used as the second development, and the red image is not mechanically removed by the second development. However, Even in this method, as shown in FIG. 5, the magnetic toner is developed in the unsaturated portion of the first red image, resulting in color mixture in the red image. When transferring the magnetic toner on the photoreceptor to recording paper, the resistance of the magnetic toner must be high to some extent.As a result, the latent image strength required for magnetic toner development is lower than that of the two-component developing method. At the initial charging potential v8 shown in FIG. 5, the quality of the image g4 when developed with magnetic toner is low, and there are also problems such as density unevenness in the two-color image. υ) According to the invention Purpose In view of the above-mentioned drawbacks, an object of the present invention is to prevent toners of different colors from adhering to unsaturated portions of dust scratches in the previous stage during the subsequent development when performing U-printing by repeating latent image formation and development. The object of the present invention is to realize a multicolor recording method that can prevent the occurrence of color mixture and obtain printing with a φ color arrangement. Furthermore, another object of the present invention is to use developing methods with different required latent image strengths so that the developed densities obtained by each developing method can be made to be of the same level, and a multi-color image with uniform density can be obtained. The object of the present invention is to realize a multicolor recording method 't7 that can obtain recorded prints. (2) Yang Cheng of the present invention According to the present invention, the present invention provides a plurality of latent image forming means for forming a latent image on a latent image forming medium; and a developing means provided corresponding to the plurality of latent image forming means to be visualized, and the plurality of latent image forming means and the developing means form a latent image, form a transparent : A multicolor recording method for obtaining multicolor recording by sequentially repeating the method, wherein a recharging step is provided after the valley image means except for the last developing means among the plurality of developing means. This is achieved by providing a color recording method. Embodiments of the Invention For the sake of simplicity, a multicolor recording method according to the present invention will be described in detail with reference to the drawings for a two-color recording apparatus. FIG. 7 shows a schematic diagram of a two-color recording apparatus for explaining the multicolor recording method according to the present invention. In this case, a two-component magnetic brush development method is applied to the first development, and a filtration magnetic toner development method is applied to the second development. The difference between the figure and FIG. 1 is that a recharging process using a recharging device 13 is provided after the first developing device 4. 1st
Parts that are the same as those in the figure are given the same numbers.0 Figure 8 shows the relationship between latent image strength and developed density in the one-component development method and the two-component development method.0 In Figure 8, in order to obtain a development gI quality of 1.0, K is 2
The component development method requires a latent image intensity of about 500 (V), and the one-component development method requires a latent image intensity of about 800 V. FIG. 9 shows the potential levels of each process of the two-color recording apparatus according to this embodiment. First, the entire surface of the photoreceptor 1 is uniformly charged by initial charging a2. The potential of this capacitor is set to the initial charging potential level v8 as shown in FIG. 9(1). Next, the photoreceptor 1 is exposed to an image corresponding to red by exposure s3. At this time, the surface potential of the photoreceptor 1 exposed by the non-light W3&C is attenuated to approximately O(V) as shown in FIG. 9(2). Thereafter, using a red toner with a positive charge, the developing bias voltage setting section 5 sets the developing bias voltage Vll to the ninth level.
As shown in FIG. 3, development is performed by setting the initial charging potential level to a value slightly lower than V8. As a result of development, red toner adheres to the photoreceptor 1 in areas from which the electric charge has been removed, as shown in FIG. Therefore, the value VTI becomes lower than the developing bias. Next, the photoreceptor 1 is charged by a recharging device 1 placed after the first dust and scratch device 4.
Recharged by 3. In this case, by using a scorotron equipped with a charge control function and a recharger having a 13Vc grid electrode, the red volatile @image s' can be brought to the same level as the background potential, as shown in Figure 9 (4). Moreover, the background voltage Vs itself can be raised to a potential of 5IWIL to 8. After this recharging, the background area leading vII is a potential at which a latent image intensity is obtained such that the image density becomes ODl, 0 or more by l-component magnetic toner development. The surface of the photoreceptor 1 exposed by the exposure part 6,
As shown in FIG. 9 (5), the potential #-i attenuates to approximately 0 [■]. Next, using black magnetic toner, development is performed by setting the developing bias voltage VB2 to a value equal to the recharging potential level yi+ as shown in FIG. 9(6) using the developing bias voltage setting section 8. At this time, magnetic toner does not adhere to the red image No. A good two-color toner image can be obtained. Therefore, the good two-color toner image formed on the photoreceptor 1 is transferred to the paper 10 by the transfer means 9, and a printed matter with good print quality can be obtained. be able to. In this example, a case was explained in which the WJ1'fA image (two-component development method, 1 g magnetic toner development method was used for the Ki-2 toy image), but both the first development and the second development were performed using one component. It goes without saying that similar effects can be obtained when using magnetic toner development or other development methods.Also, even when using only two-component development, the developing device used for the second development Destruction of the first image can be considerably prevented by lowering the magnetic force of the magnet roller and by changing the particle size of the carrier used in the developer.As a result, as in this example, only two-component development is used. Even if the present invention is used, color mixing of the first image can be prevented and the same effect can be obtained.Also, the required latent image strength in the development method used for the first development and the second development is almost the same. In this case, it is not necessary to raise the background potential Vs by the recharging process as in this embodiment, and it is sufficient to control the scorotron so that only the image potential of the first image is at the same level as the background S potential. Further, in this embodiment, the case where two-color recording is performed is explained for the sake of simplicity, but it goes without saying that the same effect can be obtained even when multi-color recording is performed using three or more colors.Q Invention As described in detail, according to the present invention, when multicolor recording is performed by sequentially repeating S-ring formation and development, toner of a different light color adheres to the unsaturated area of the 11th area depending on the next development. It is possible to obtain a good multicolor image GL without color mixture by preventing the above problems, and also to obtain a good multicolor image without density unevenness even when using the VT method with different required latent intensities. 4. Brief explanation of the drawings Fig. 1 is a schematic diagram of a conventional two-color recording device, Fig. 2 is a diagram showing the potential levels of each process of the two-color printing device shown in Fig. 1, and Fig. 3 is a diagram of a developing device. A diagram explaining the development state of , !s4 diagram,
Fig. 6 is a diagram showing the relationship between contact depth and current density, Fig. 5 is a diagram illustrating the occurrence of color mixture in a two-color recording device,
FIG. 7 is a schematic diagram of a two-color recording device for explaining the multicolor recording method according to the present invention, FIG. 8 is a chest diagram of latent image intensity and developed density, and FIG. In Figure 0, which is a diagram showing the potential levels of each process of the two-color recording device, 1 is the photoreceptor, 2 is the initial charger, 3°6 is the exposure section, and 4
．． 7 is a developing device, 5 and 8 are developing bias setting sections, 9V
i transfer means, 10Fi paper, 11 cleaning process,
12 is a static elimination process and a 13Fi recharger. Agent: Patent Attorney Hiroshi Matsuoka, Department 5.・L-many,・;”・ (5) Second exposure (B) Second phenomenon (black) qth (red) B2 Figure

Claims (1)

[Claims] +1) After uniformly charging the entire surface of the latent image forming medium,
In a two-color recording device that obtains two-color recording by performing first exposure and first development using a two-component development method, followed by second exposure and second development using a first-order development method. A two-color recording device characterized in that a recharging step is provided between the first development and the second exposure. (2. A two-color recording device according to claim 1, characterized in that the first development and the second development use an inversion development method.