JPS587662A - Multiple color printer - Google Patents

Abstract

PURPOSE:To develop respective latent image potentials with toners of different colors by subjecting the surfaces of various kinds of phitoreceptors having conductive layers and photoconductive layers basically to exposure and charge by a laser light having the quantity of light of many-valued levels simultaneously. CONSTITUTION:Since a laser light is off in the black image parts to be exposed at the quantity of light corresponding to two color images by said laser light simultaneously with positive electrostatic charging, said parts are charged positively as they are and the positive potential is formed. In the white image parts, on the other hand, they are exposed by weak light and therefore a photoconductive layer 1b is thoroughly conducted, and all the electrostatic charges are discharged despite positive charging and roughly zero potential is formed. The surface potentials in the image parts of black, red and white are formed in the above-mentioned manner, and if these are developed with colored particles corresponding to the respective levels, the two color images are obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multicolor printer C, and particularly to a multicolor printer that is easy to process.

Conventionally, there is a laser beam printer as a non-impact printer using electrophotographic technology and a laser. This modulates the laser beam according to the information signal and further deflects it to form two-dimensional information on the recording medium in the form of pixel resolution, and then obtains a recorded image using a known electrophotographic process. It is something. In this case, since two-dimensional information is recorded in the form of pixel decomposition, it is easy to combine different types of information, delete information, or change the size of various characters. However, #kii! Since the information is printed in the same color on 1gl1, it is difficult to identify the information. Also, in the future, administrative processing, etc. It is thought that there will be a strong demand for distinguishing between text and document information, or between additional information, supplementary information, etc., and main information. There are multi-color printers that can identify different types of information to meet these demands, but the current multi-color printers only have very complicated processes, and it is difficult to make the device compact, lightweight, or low-cost. Currently, it is not possible to immediately convert it into a single-color printer.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a multicolor printer that has a simple process, is small in size, lightweight, and low in cost.

The present invention is a multicolor printer that simultaneously exposes and charges 62 types of photoreceptors that basically have a conductive layer and a photoconductive layer with a laser beam having a multilevel light intensity. ,
A multivalued latent potential vIk+J corresponding to each exposure amount is formed on the photoconductor, and each latent potential g1. It is assumed that VOW is to print the t1 position with different colored toners.

Hereinafter, an example of an actual ship of Hongyomei will be explained based on the drawings. This example is for two-color printing.

FIG. 1 shows the fundamentals of the two-color printer of this embodiment. (
1) shows a two-sensitizer consisting of a conductive group & (1a) and a photoconductive layer (1b). First, charger (2)
and laser light (3) (two electric lights and l C-perform simultaneously to form a latent image potential corresponding to two colors. At this time, the laser light emitted from the laser light source (4) is transmitted to the modulator (5). through 2
The light is converted into a light amount corresponding to the color image C2, deflected by a deflector (6), and scanned over the two-layer photosensitive element (2).

Next ζ2 Genrenki (7) G2 Use opposite polarity toner (for example, red toner with positive polarity, black toner with negative polarity) to bias the current type. current position
21 II, 2 colors 1iIj fireflies 2 photoconductors (11 upper =
Form.

After that, align the polarity of the toner with a charger (814), apply a voltage of opposite polarity to the charger (90), and transfer the two-color image onto the recording paper 0a (12). The two-layer photoreceptor (11 is passed through the static elimination station Ous and the cleaning station (2) for repeated use, and the cleaning be blinded.

Next, the electrostatic latent g1 formation process will be explained in detail with reference to FIG.

First, since the light is off in the black image area where G light is applied by laser beam at the light intensity corresponding to the two colors mm at the same time as positive charging, positive charging continues as it is, and a positive potential is formed.

On the other hand, since the white image area is exposed to weak light, the optical electric field (1b) becomes semi-conductive and some of the positively charged charges are discharged, so a positive potential of approximately 1 is formed in the black image area. Ru. In addition, the blush part 9 is exposed with a strong party, Tashima, photoconductive II (
Even if 11) becomes completely conductive and positively charged, the charged charges are combined and discharged to form a potential of approximately zero. In this way, the surface potentials of the black, red, and white image areas are formed. FIG. 3 shows the time course of the surface potential in the process in this case. In this way, two color ms can be created by coloring particles at each level.
'1.

Next, two f-type examples C of this embodiment will be described. In the embodiment described above, the potential of the self-portrait area is approximately 2 times the potential of the black area.
However, by reversing the exposure amount of the red image area and self-portrait area, the potential of the red 1iii area is approximately 1 of the potential of the black image area.
It is also possible to set the white image area to approximately zero potential; in this case,
First, the potential of the red mis area is approximately equal to the potential of the white image area: ll * bias potential ζ; The red toner is used to perform the actual work. Therefore, in this case, it is not necessary to charge the two toners so that the charged polarities are the same, and the two-color transfer charger (9) can transfer the two colors ij and ζ onto the recording paper aD. Further, in the above embodiment, a two-layer photoreceptor consisting of a conductive substrate and a photoconductive layer was used, but the present invention is not limited to this, and various multilayer photoreceptors having a basic C2 two-layer structure are used. Similar results can be obtained using the body. For example, a three-color printer using a three-layer photoreceptor with a transparent insulating layer (1c) formed on the two-layer photoreceptor described above can also be implemented. Charge distribution vI for this three-color printer process! Fig. 4 is shown in Fig. 4, and Fig. jI5 shows the time course of the surface potential during the process. In this way, a three-color image is obtained by sequentially applying colored particles to each level.

Specific numerical values in this example are shown. A two-layer photoreceptor (1) with a 60μm 8e photoisoelectric layer V formed on a 3D toden substrate.
First, charge! ! While applying a voltage (21 g: l-+5.5 KV), image exposure is simultaneously performed using a 15 mW Ar laser. At this time, 4erg/aL 6er@/d 15erg for the red image area, blue image area, and white image area, respectively.
Expose with an exposure amount of /-. Then, the latent image potential of each image tube part is 600V, 4007%! It becomes 100v.

Also, since the black image area is not exposed to laser light, the latent image potential is 8
It remains at 00v. Next, a current bias voltage of +6007 is applied to a current bias voltage of +6007 to a current bias voltage of +6007 to form a black image area. Next, the present bias voltage is set to +400 V, and a present molding process is performed using a present material g11a made of negatively charged red toner to form a red mnemonic part. Further, the C2 current bias is set to +150V, and development is performed using a developer made of negatively charged blue toner to form a blue image area. In this way, on the photoreceptor (forming a 23-color image),
-5KV to the charger (8) to adjust the charge amount of each color toner.
voltage is applied to keep the amount of charge held by each color toner constant. Next, a voltage of +5.5 KV is applied to the charger (9), and the three-color image on the photoreceptor is transferred onto the recording paper αG. As a result, a clear three-color painting consisting of black, red, and blue was obtained. Similarly, for the n-color image side, a latent image potential with a slight level of n is formed on the photoreceptor, and each latent image potential I: is sequentially developed with charged colored particles of the corresponding n colors. Can be 0 or more C
By simultaneously performing exposure and charging at multiple levels of light intensity (;), latent image formation can be realized in a single process (2), rather than a complex process (e.g., first charging + second charging) seen in conventional methods. There is no need for reverse polarity charging, and a small, lightweight, and low-cost multicolor printer can be realized.

[Brief explanation of the drawing]

It! Figure 1 is a configuration diagram of the printer of the present invention, Figure 2 is an explanatory diagram of the electrostatic S image forming process using a two-layer photoreceptor, Figure 3 is a time course diagram of the surface potential at that time, and Figure 4 is a diagram of the three-layer photoreceptor. An illustration of the electrostatic latent image formation process using a layered photoreceptor tube! l! Figure 5 is a time course diagram of the surface potential at that time. 1... Two-layer sensitive member 1a... Conductive substrate 1b
... Photoconductive layer 2 ... Charger 3 ... Laser light 4 ... Laser + m5 ... Modulator
6... Deflector 7... Charger 8.
... Charger (7317) Agent Patent Attorney Rules Kinden
Yu (and 1 other person) Figure 1 Figure 2 1 1
11 1 1 Figure 4 Figure 5

Claims (1)

[Claims] On various photoreceptors basically having a conductive layer and a photoconductive layer, exposure and charging using a laser light beam having a multi-value level of light amount is performed simultaneously C2, corresponding to each exposure amount type. The multi-color printer is characterized in that a multi-valued latent potential is formed on the photoreceptor, and each of the latent potentials is developed with a different color toner.