JPH03229280A - Multicolor electrophotographic method - Google Patents

Abstract

PURPOSE:To remove moire and to obtain a sharp image by making the angles between a subject and detectors different by specific colors and detecting them, forming latent images of the respective specific colors on respective photosensitive bodies based on the detection results, and transferring them one over another to paper. CONSTITUTION:This method includes a storage means 3 which stores the images of the specific colors detected by the detector 2, a laser light source control means 4 which varies the output of a laser light source by the storage means 3, and a photosensitive body 5 where an image is projected by the laser light source control means 4. Then the angles theta between the subject 1 and detectors 2 are made different by the specific colors and detected by the respective detectors, the latent images corresponding to the specific colors are formed on the respective photosensitive bodies based on the detection results, and they are transferred one over another to the paper. Therefore, the edges of dots can be represented clearly by using the electrophotographic sensitive bodies 5 having extremely high latent image gamma and whether the dots are large or small is represented to enable gradational representation. Consequently, the moire is removed and the sharp image is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a multicolor electrophotographic method, and particularly to a method for eliminating moiré, which is required during colorization.

(Prior Art) Many multicolor electrophotographic methods have been proposed in the past, but their low resolution is one of the reasons why they have been sluggish, with results far inferior to printing methods.

Because of the low resolution, accurate printing has almost been abandoned, and problems such as so-called uneven color tones and moiré have been ignored.

(Problems to be Solved by the Invention) Needless to say, eliminating moiré is a basic requirement in order to obtain good color printing in offset printing.

In electrophotographic technology, the overall accuracy has not yet improved enough to pay close attention to such details, and there has been no discussion regarding moiré removal.

However, recently, when the halftone halftone dots produced by the dithering method reach a certain level, the moiré problem has begun to surface.

Furthermore, the present inventor succeeded in developing an electrophotographic photoreceptor with an extremely high γ value, which was disclosed in Japanese Patent Application No. 62-328465, and further utilized this high γ property to increase laser output. We discovered a technique to change the dot area on the surface of an electrophotographic photoreceptor by making it variable, and this was published in Japanese Patent Application No. 1-505.
I proposed it as No. 71.

These two proposals gave electrophotographic technology an image-forming ability that is extremely close to that of offset printing, but as dot shapes become more clearly expressed down to the smallest details, the problem of moiré becomes more serious. It has emerged as a matter of fact.

In conventional electrophotographic techniques, the resolution is basically low because the photoreceptor is used with a low γ characteristic.

FIG. 13a, FIG. 13b, and FIG. 13C are diagrams conceptually showing this situation.

FIG. 13a shows an ideal incident optical image, FIG. 13 shows a latent image formed on a photoreceptor with low γ, and FIG. 13C shows a latent image formed on a photoreceptor with high γ.

At the stage of latent image formation, the image on the low-gamma photoreceptor shown in Figure 13 is distorted, so no matter what improvements are made to the development, it is necessary to faithfully reproduce the original optical incident light image. Things are completely impossible.

On the other hand, the latent image formed on a photoreceptor with a high γ will be as shown in Figure 13C, so if you pay attention to the selection of the bias voltage for development and the characteristics of the developer. , it is possible to obtain an image that is almost the same as the original (Fig. 13a).

This result was obtained from the patent application filed in 1982-32 as shown by the solid line in Figure 5.
This is supported by the extremely steep γ characteristic obtained by the technique of No. 8465.

A photoreceptor with high resolution in this way can be used to express images with gradation depending on halftone dots using the so-called dither method or the technology disclosed in Japanese Patent Application No. 1-50571. be done.

The technology disclosed in Japanese Patent Application No. 1-50571 uses a laser beam given a unique light intensity distribution as shown in FIG. 9 to scan a photoreceptor as shown by the solid line in FIG. It is characterized by arbitrarily modulating the laser light output.

FIG. 9 is a diagram conceptually showing changes in the diameter of latent image dots obtained when the optical output of the laser is changed. In the diagram, 3
The light output is changed in stages, and the 2.61t J/
cm" line corresponds to 2.6 μJ/c in FIG.

The figure shows how the dot diameter of the latent image changes in three stages, a, b, and c, depending on the change in the light input in three stages.

This technique provides a much faster method of halftone processing than the dither method. In any case, as halftones come to be expressed by being broken down into halftone dots, there is a continuing need for colorization of electrophotography.

With conventionally used photoreceptors with low gamma, the edges of the dots are blurred, so they cannot be expressed as accurate dots, and the color mixing that can be achieved with offset printing is not possible. Efforts have been made to accomplish this.

However, with this method, it was not possible to obtain vivid color tones comparable to that of printing, which was one of the weaknesses of electrophotography.

The inventor of the present invention encountered the same moiré problem as printing while trying to improve image accuracy using a high-gamma photoreceptor.

In printing, as is well known, the screen angle is changed for each color to prevent moiré.

Printing techniques involve screen-based halftone dotting, which is time-consuming, so the same technique cannot be used as an electrophotographic method, where speed is of paramount importance.

Therefore, new techniques must be devised to replace this.

(Means for Solving the Problems) The multicolor electrophotographic method of the present invention includes a subject, a detector arranged at a relative angle on a plane parallel to the subject, and detects an image of a specific color. , a storage means for storing an image of a specific color detected by the detector, a laser light source control means capable of changing the output of the laser light source by the storage means, and a photoreceptor onto which the image is projected by the laser light source control means. , forming a latent image on the photoreceptor at the angle, wherein the angle between the subject and the detector is made different for each specific color and detected by each detector;
Based on this detection, a latent image corresponding to each specific color is formed on each photoreceptor, and the images are transferred and synthesized onto paper.

Further, the multicolor electrophotographic method of the present invention includes a subject, a detector arranged at a relative angle on a plane parallel to the subject to detect an image of a specific color, and an image of a specific color detected by the detector. A storage means for storing an image of a specific color, a laser light source control means that can change the output of the laser light source by the storage means, a photoreceptor on which a latent image is formed by projection by the laser light source control means, and a photoreceptor for forming a latent image by projection on the photoreceptor a sheet of paper on which a latent image is transferred, and the angle between the photoreceptor and the paper is the same as the angle between the object and the detector, and the angle between the object and the detector is the same as the angle between the object and the detector. The angle is set differently for each specific color and detected by each detector. Based on this detection, a latent image corresponding to each specific color is formed on each photoreceptor, and these images are transferred to paper and combined. .

Further, the laser light source control means has a predetermined light amount distribution within the bright spot of the laser projected onto the photoreceptor, and the amount of light emitted from the light source can be changed by the storage means.

Further, the photoreceptor is formed of an endless band or a cylindrical drum.

Furthermore, the detector is formed by a charge-coupled device camera detector.

(Operation) The multicolor electrophotographic method configured as described above uses an image of a specific color detected by a detector arranged at a relative angle on a plane parallel to the subject to detect an image of a specific color. The output of the laser light source of the laser light source control means is changed by the storage means for storing the angle, and the output of the laser light source of the laser light source control means is changed and projected onto the photoreceptor to form a latent image on the photoreceptor at the angle, and the object and the detector are The angle formed by each specific color is detected by each detector, and based on this detection, a latent image corresponding to each specific color is formed on each photoreceptor, and these are transferred to paper and combined. Each specific color is transferred at a different angle, making it possible to remove moiré.

Further, the laser light source of the laser light source control means is controlled by a storage means for storing an image of a particular color detected by a detector arranged at a relative angle on a plane parallel to the subject and detecting an image of a particular color. The output is changed and the image is projected onto a photoreceptor so that the angle between the photoreceptor and the paper is the same as the angle between the object and the detector, and the angle between the object and the detector is adjusted for each specific color. Based on this detection, a latent image corresponding to each specific color is formed on each photoreceptor, and these images are transferred to paper and combined. It is possible to remove moiré by tightening the image and transferring it differently.

In addition, by using a photoreceptor with an extremely high latent image γ,
The edge of the dot can be clearly expressed, the laser light source control means has a predetermined light intensity distribution within the bright spot of the laser projected onto the photoreceptor, and the light emission amount of the light source can be changed by the storage means. Because of this structure, it is possible to arbitrarily change the laser output and the diameter of the bright spot to express the size of the dots and express gradations without increasing the scanning line density.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 schematically shows an embodiment of the present invention.
is the subject, and the angle θ is relative to the plane parallel to the subject 1.
a detector 2 for detecting an image of a specific color by arranging the detector 2, a storage device 3 for storing the image of the specific color detected by the detector 2, and a laser light source control device that can change the a-power of the laser light source by the storage device 3. means 4 and laser light source control means 4
A latent image is formed on the photoreceptor 5 at an angle θ.

In the multicolor electrophotographic method, the angle θ between the subject 1 and the detector 2 is set to be different for each specific color as described later, and each detector detects the latent image corresponding to each specific color. are formed on each photoreceptor, and then transferred and synthesized onto paper.

The detector 2 is a photoelectric element, for example, a charge coupled device camera (Charge Coupled Device camera).
e), which is a charge-coupled device [CCD] as shown in FIG.
ce) elements] arranged in four rows, for example.

The example camera made with four rows of charge-coupled devices has an angle of tan-"yi # 14.036°,
It works correctly when held against the subject.

Of course, this angle is arbitrarily selected as the angle to be applied to eliminate moiré.

For example, if the camera is formed in 5 rows, 1), 3.1°
If the camera is formed in 3 rows, it will be 18.43
It becomes 5°.

Needless to say, the element arrangement in the camera can be changed in various ways, and a more rational element arrangement can also be considered.

From a broader perspective, electrophotographic technology is following offset printing technology.

The moiré problem in offset printing is
As image precision increases, this problem becomes more common.

Immediacy is the lifeblood of electrophotography, so it is not allowed to waste time creating master plates, and everything must be processed immediately.

Therefore, the addition of printing angles to prevent moiré is not done at the stage of producing the original (it must be done at the same time as the original is read).

Of course, for example, when performing multicolor printing by computer-based composition, or when copying a color original by reading it separately, printing in three to four colors is required.

The four colors refer to cyan, magic, yellow, and black.

In printing, for example, yellow is given a printing angle of 0°, cyan is given a printing angle of -156, magic is given a printing angle of 151, and black is given a printing angle of 90°. The moiré caused by this is made less noticeable as a result of printing.

Further, the storage means 3 is, for example, a storage means of a charge-coupled device camera.

As is well known, the charge-coupled device camera is capable of storing what is detected by the detector 2 at intervals, and sending out what has been stored temporally by the storage means 3.

That is, the storage means 3 stores images projected on four columns of charge-coupled devices at once, and then, for example, sequentially emits signals in the first column from the left, and then sequentially releases signals from the left in the second column. When the rightmost signal in the fourth column is finally released, the next step of photographing begins.

Then, the entire surface of the object is divided into four screens of charge-coupled device cameras (CCD cameras) arranged in four rows, the images are taken, and the signals are sent one after another to the laser light source control means 4 to create an image of the object 1. The diameter of the laser bright spot is variably controlled based on this.

Therefore, the light from the semiconductor laser element 1) variably controlled by the laser light source control means 4 is projected onto the photoreceptor 5.

The photoreceptor 5 is formed of an endless band having a high latent image γ, the details of which will be described later.

Further, the laser light source control means 4 can change the laser light source by the storage means 3, and the laser light source control means 4 has a predetermined light intensity distribution within the bright spot of the laser projected onto the photoreceptor 5. Moreover, the amount of light emitted from the light source can be changed by the laser light source control means 4.

That is, the images projected onto the four rows of charge-coupled devices are stored in the storage means 3 at - degrees, and based on the information in the storage means 3,
The laser light source control means 4 forms a latent image on the photoreceptor 5 sequentially from the left side of the first row detected by the detector 2 at an angle θ, and then from the left side of the second row and finally the second row. Once a latent image corresponding to the rightmost end of the fourth row is formed on the photoreceptor 5, the next latent image step begins.

1) is a semiconductor laser element, 12 is an optical system such as a condenser lens, 13 is a polygon mirror (rotating polygon @),
Reference numeral 14 indicates an optical system such as an fθ lens.

Note that the motor that drives the polygon mirror 13 and the photoreceptor S
The nearby charging charger, developing device, transfer charger, optical system of a charge-coupled device camera (CCD camera), etc. are omitted.

Furthermore, the angle θ between the subject 1 and the detector 2 is different for each specific color, and the angle θ between the object 1 and the detector 2 is different for each specific color.
is placed at an angle θ with respect to the subject l, and the subject 1
information is given diagonally, and the first color (for example, blue, θ
is 15°), the second color (for example, red, θ is -15°)
, the third color (for example, yellow, θ is 75°), and the fourth color (for example, black, θ is 45°).

That is, in the first section, the angle θ is 15°, and the detector 2
Assume that only blue color is detected.

The storage means 3 controls the laser light source control means 4 based on the detector 2 to form a latent image on the photoreceptor 5 at an angle (θ=15°) (see FIG. 3), and a developing device (not shown) forms a blue latent image. It is developed with toner and becomes a visible image on paper.

In this way, a first color toner image (blue) is formed on the paper.

Next, although not shown, it is assumed that the angle θ shown in FIG. The image is formed and developed with red toner by a developing device (not shown) to be visualized on paper.

Next, although not shown, the angle θ shown in FIG. 1 is set to 75°, the detector 2 detects only a third color, for example, yellow, and a latent image is formed on the photoreceptor 5 in the same manner as described above. The image is then developed with yellow toner by a developing device (not shown) and visualized on paper.

Next, although not shown, the angle θ shown in FIG. 1 is set to 45 degrees, the detector 2 detects only the fourth color, for example, black, and a latent image is formed on the photoreceptor 5 in the same manner as described above. and a developing device (not shown).

It is developed with red toner and left as a visible image on paper.
A multicolor electrophotograph is obtained by transferring and combining blue, red, yellow, and black colors onto paper.

That is, in the multicolor electrophotographic method, the angle θ between the subject 1 and the H detector 2 is different for each specific color, and each detector detects the angle θ, and based on this detection, the latency corresponding to each specific color is determined. Some images are formed on each photoreceptor, transferred to paper, and combined.The images are fixed on the paper by a fixing device (not shown) and then discharged to a machine.

The photoreceptor 5 was previously proposed by the present inventor in Japanese Patent Application No. 6-3284.
It is made using the technology proposed in No. 65.

This technology produces intrinsic semiconductor microcrystals or amorphous flat conductor fine powder with an average particle size of 0.5 μm or less and 0.01 μm or more.
This is achieved by a combination of highly insulating binders having a volume resistivity of 1013 Ω-cm or more.

The photoreceptor 5 used in this embodiment responds rapidly when a certain amount of light is reached, and its surface potential rapidly decreases almost linearly.

That is, ON and OFF operations are shown based on the amount of light.

As a result, it provides an extremely high gamma image (conventional photoreceptors have a gamma of 1 to 2).

The concept of γ was originally given for visualized images in silver halide photography, but there is a similar concept in electrophotography.

However, in order to further facilitate the explanation, "γ of the latent image" is defined and used here to express the steepness of the latent image.

Needless to say, a photoreceptor with a high latent image γ is suitable for expressing digital light input.

The photoreceptor 5 having a high latent image γ has the following composition, for example.

α type steel phthalocyanine 1G, 6 gr.

Polyester resin 36.75gr.

(Mitsui Toatsusha P-645) Melamine resin 13.8gr.

(Manufactured by Mitsui Toatsu Co., Ltd., Kneepan 2O-H5') Cyclohexanone 170 gr - After stirring the above mixture for 2 hours with a vibrating stirrer, it was placed on the surface of an aluminum cylinder with a diameter of 80 mm to a thickness of 15 μm after drying. After coating and drying in the same manner, it was heated in an atmosphere of 150'C for 2 hours, and then cooled to room temperature to obtain a photoreceptor 5.

When this photoreceptor 5 is given a surface potential of 600 volts, it exhibits rapid optical attenuation with an input of about 2.4 μJ/c at 780 nm, the γ of the latent image reaches about 100, and the residual potential is 20 volts. It was confirmed that the amount of damage was approximately 100% (see Figure 5).

Here, we will simply state that Japanese Patent Application No. 62-328465 is a technology that was realized by applying the avalanche phenomenon, which previously included electrophotographic methods and had never been conveniently used for photoreceptors. (.

Further, the laser light source control means 4 is manufactured, for example, by the technique previously proposed by the present inventor in Japanese Patent Application No. 1-50571.

At the imaging plane of the laser beam projected onto the photoreceptor 5,
Gives a specific light intensity distribution within the bright spot.

An example is shown in FIG. In order to simplify the explanation, FIG. 6 shows an extremely schematic example of a cross-section of the light quantity distribution.

FIG. 7 shows this in a three-dimensional model.

FIG. 8 shows the relationship between the optical output of the solid semiconductor and the applied voltage.

As is clear from this figure, the amount of light emitted is controlled by controlling the voltage (the laser output is modulated).

FIG. 9 shows the projected bright spots when the voltage is changed.

In the figure, A, B, and C are approximately 100% and 70%, respectively.

The cross section shows the light amount distribution within the bright spot when the light emission amount is 50%. What is shown with a dotted line in the figure is the amount of light showing the rapid optical attenuation of the photoreceptor illustrated in FIG. The photoreceptor loses its surface potential above this dotted line.

In the case of the figure, the surface of the photoreceptor 5 has diameters a and b.

A potential loss point C is formed.

In the example in the figure, A is the case where 100% light is emitted,
B shows the case where the light emission amount is controlled to about 70%, and C shows the case where the light emission amount is controlled to about 50%.

And the area ratio of the surface potential loss points created in this case is:
approximately 1.0.0.48.0.1, respectively.

FIGS. 10(a), 10(b), and 10(c) show examples of latent image patterns created on the surface of the photoreceptor using three types of input voltages.

In Figure 1O (C), 6-1.6-2° 6-3 represents the input voltage state, and in Figure 1O (b), 6-1°, 6
-2', 6-3' are diagrams showing the state when surface potentials 6-1", 6-2" and 6-3°" are visualized in FIG. 10(a). It is shown in cross section.

The degree of blackening decreases in the order of 6-1°, 6-2', and 6-3'.

The case of expressing continuous gradation is shown in Fig. 1).

Both FIG. 10 and FIG. 1) are conceptual diagrams drawn along one scanning line.

As can be understood from the above explanation, (1) A photoreceptor having an extremely high latent image γ (γ of a conventional photoreceptor is 1 to 2) is used.

(2) Give a predetermined light intensity distribution to the laser bright spot.

(3) Change the laser output arbitrarily.

When the above three conditions are satisfied, it becomes possible to express gradation without narrowing down the diameter of the bright spot or increasing the scanning line density.

Furthermore, there are various ways to make the system easier to use, but the second
, 3 will be described as an example.

FIG. 12 is a schematic three-dimensional diagram showing various states in which the distribution of light amount within a bright spot is changed.

FIG. 12(a) shows a case where a double-stage distribution is given to the format shown in FIG. This is a distribution that accurately represents points in response to changing input voltage levels. Figure 12 (b
) is used to express square halftone dots. FIG. 12(C) is an example for continuous square halftone dots. Figure 12 (d
) is an example used when there is sufficient laser output.

Next, a commercially available printer (process speed 1 x 5 7μ) was used, and the above photoreceptor was used in place of the conventional 5eAs photoreceptor.

Furthermore, the laser light source that was originally installed had an output of 5mW, but was switched to 10mW. The laser is GaA
It is IAsPIN type.

Separately, when we investigated the original light intensity distribution within the bright spot, we found that it roughly follows a Gaussian distribution, although it is somewhat flat.

The distribution was schematically shown as a in FIG. 14. I created a density filter to correct this distribution. The state corrected by this filter was the state shown in FIG. 14.

Using the above 10m W laser and density filter,
A density filter (not shown) is placed between the condenser lens 2 and the polygon mirror 13 shown in FIG.

Alternatively, a window provided in the laser element may have the function of a density filter.

A density filter is a filter with a density distribution that is placed in the condensing optical path, and it is used to adjust the density as required for the final result while paying attention to the light intensity distribution that the semiconductor laser element (laser emitter) basically has. It must be manufactured in such a way that a bright spot distribution of light intensity can be obtained. Note that, for example, one or more density filters are formed so as to make it difficult for light to pass from the center to the periphery.

The wavefront aberration of the optical systems currently used in laser systems has been carefully considered, so even if a filter is inserted into the optical system, the concentration distribution at the focal point will not change significantly.

A normal laser beam has a Gaussian distribution, so the amount of light at the periphery is naturally lower than at the center.
A correction filter can be made relatively easily. If the Gaussian distribution that the laser beam basically has is close to the intended light intensity distribution, that is, if it can be used as a predetermined light intensity distribution,
The goal is achieved even without a filter.

Then, the 10 mW laser and the density filter described above were used, and the density filter (not shown) was placed between the condenser lens 12 and the polygon mirror 13 shown in FIG. 1 and operated.

By varying the voltage applied to the laser diode in seven steps from 225 volts to 2.4 volts, it was possible to accurately create point images with seven different sizes.

That is, we succeeded in accurately visualizing dots of various diameters by using bright spots with the same diameter as conventional bright spots.

Further, FIG. 4 schematically shows another embodiment of the present invention, in which the same parts as in the above-described embodiment have the same reference numerals.

The difference from the one shown in FIG. 1 is that the photoreceptor 5 has a cylindrical shape, and the photoreceptor 5 and the paper 6 are inclined accordingly.The other points are the same as described above.

That is, in FIG. 4, 1 is an object, a detector 2 is arranged at an angle θ relative to the object 1 on a plane parallel to the object 1, and detects an image of a specific color; a storage means 3 for storing color images; a laser light source control means 4 capable of changing the output of the laser light source by the storage means 3; a photoconductor 5' for forming a latent image by projection by the laser light source control means 4; It has a paper 6 on which a latent image of the object 5' is transferred, and the angle θ formed by the photoreceptor 5' and the paper 6 is the same as the angle θ formed between the object 1 and the detector 2. The angle θ between 1 and the detector 2 is set to be different for each specific color and detected by each detector. Based on this detection, a latent image corresponding to each specific color is formed on each photoreceptor, and these are printed on a paper 6. A multicolor electrophotograph is obtained by transferring and synthesizing the images.

Note that the angle θ is changed depending on different color image signals (for example, blue, red, yellow, and black), and the detector 2 of the charge-coupled device camera is placed at an angle θ with respect to the subject 1. The information of the subject 1 is given diagonally, and the first color (for example, blue, θ is 15 degrees), the second color (for example, red, θ is -15 degrees), and the third color (for example, yellow in,
θ is 75°), the fourth color (for example, black and θ is 45°)
The angle θ is made different for each.

(Effects of the Invention) Since the present invention is configured as described above, it produces the effects described below.

The electrophotographic method of the present invention includes a subject, a detector arranged at a relative angle on a plane parallel to the subject to detect an image of a specific color, and an image of a specific color detected by the detector. a storage means for storing a latent image on the photoreceptor at the angle, a laser light source control means capable of changing the output of the laser light source by the storage means, and a photoreceptor onto which the laser light source is projected. The angle between the subject and the detector is set to be different for each specific color, and each detector detects the image, and based on this detection, a latent image corresponding to each specific color is formed on each photoreceptor. By using an electrophotographic photoreceptor with an extremely high latent image γ (conventional photoreceptor γ is 1 to 2), the edges of the dots can be clearly seen. Moreover, it is possible to express the size of dots by giving a predetermined light intensity distribution to the laser bright spot, changing the laser output arbitrarily, and changing the diameter of the bright spot without increasing the scanning line density. It is possible to obtain an electrophotographic method that can express gradations, transfer specific colors at different angles, remove moiré, and obtain clear images.

Further, the electrophotographic method of the present invention includes a subject, a detector arranged at a relative angle on a plane parallel to the subject to detect an image of a specific color, and a detector of a specific color detected by the detector. a storage means for storing an image of the image; a laser light source control means capable of changing the output of the laser light source by the storage means; a photoconductor onto which a latent image is projected by the laser light source control means; and a latent image on the photoconductor. , and the angle between the photoreceptor and the paper is the same as the angle between the subject and the detector, and the angle between the subject and the detector is the same as the angle between the subject and the detector. Each specific color is detected differently by each detector, and based on this detection, a latent image corresponding to each specific color is formed on each photoreceptor, and these are transferred to paper and combined, resulting in an extremely high By using an electrophotographic photoreceptor with a latent image γ (conventional photoreceptor γ is 1 to 2), the edges of dots can be clearly expressed, and the laser bright spot can be given a predetermined light intensity distribution, which increases the laser output. By changing the diameter of the bright spot arbitrarily, it is possible to express the size of the dot and express the gradation without increasing the scanning line density.Furthermore, each specific color is transferred at a different angle, which eliminates moiré. It is possible to obtain an electrophotographic method that can remove .

Of course, the effects of the present invention are not limited by the type of laser light source, and are not limited to the solid-state semiconductor laser used in the above explanation.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram schematically showing an embodiment of the present invention, and FIG. 2 is a diagram showing a part of a detector of a charge-coupled device camera used in FIG. FIG. 3 is a diagram showing dots transferred at an angle, FIG. 4 is an explanatory diagram schematically showing another embodiment of the present invention, and FIG. 5 is an illustration of an embodiment of the present invention. The photosensitivity characteristics of the photoreceptor used in the example are shown. Figure 6 is an example of a horizontal cross-section of the light quantity distribution, and Figure 7 is a schematic three-dimensional diagram of the light quantity distribution. , FIG. 8 shows the relationship between the optical output of the solid-state semiconductor and the applied voltage, and FIG. 9 shows the bright spots projected when the voltage is changed. shows examples of latent image patterns created on the surface of the photoreceptor with three types of input voltages, the 1st) represents continuous gradation, and the 12th
Figures a, b, c, and d are three-dimensional diagrams schematically showing various states in which the light intensity distribution within a bright spot is changed;
Figure C is a diagram conceptually showing the resolving power. FIG. 14 is a diagram showing a latent image formed on a photoreceptor with high γ, and FIG. 14 is a diagram showing a light amount distribution within a bright spot. ■...Subject 2...Pressure detector, 3...Storage means, 4...Laser light source control means 5.5''...Photoconductor 2. 6-2"6-3" →t -1 -2 -3 →1st →t 2nd figure j3 3rd 4th figure #point embryo

Claims (6)

[Claims] (1) A subject and a detector arranged at a relative angle on a plane parallel to the subject to detect an image of a specific color;
It has a storage means for storing an image of a specific color detected by this detector, a laser light source control means that can change the output of the laser light source by this storage means, and a photoreceptor onto which the image is projected by this laser light source control means. A latent image is formed on the photoreceptor at the angle, the angle between the object and the detector is set to be different for each specific color, and each detector detects the specific color. A multicolor electrophotographic method in which a corresponding latent image is formed on each photoreceptor, and then transferred and synthesized onto paper. (2) a subject and a detector arranged at a relative angle on a plane parallel to the subject to detect an image of a specific color;
A storage means for storing an image of a specific color detected by the detector, a laser light source control means capable of changing the output of the laser light source using the storage means, and a photoreceptor onto which a latent image is projected by the laser light source control means. and a paper to which the latent image of the photoreceptor is transferred, and the angle between the photoreceptor and the paper is the same as the angle between the object and the detector, and the angle between the object and the detector is the same as the angle between the object and the detector. The angle formed by the detector is set to be different for each specific color, and each detector detects it.Based on this detection, a latent image corresponding to each specific color is formed on each photoreceptor, and these are transferred to paper and synthesized. A multicolor electrophotographic method. (3) A claim in which the laser light source control means is formed by a laser light source control means that has a predetermined light intensity distribution within the bright spot of the laser projected onto the photoreceptor and is capable of changing the light emission amount of the light source by a storage means. 3. The multicolor electrophotographic method according to claim 1 or claim 2. (4) The multicolor electrophotographic method according to claim 1, wherein the photoreceptor is formed of an endless band. (5) The multicolor electrophotographic method according to claim 2, wherein the photoreceptor is a cylindrical drum type. (6) The multicolor electrophotographic method according to claim 1 or 2, wherein the detector is formed by a detector of a charge-coupled device type camera.