JPH02118628A - Color image forming device - Google Patents

Abstract

PURPOSE:To form a color image in a tone corresponding to a hue and a density to be set on a photosensitive recording medium by exposing the photosensitive recording medium with each wavelength light and forming a latent image. CONSTITUTION:A control part 34 drives a step motor 32 and controls a red filter 24R of a filter 24 so as to come just under a lens 22. In such a condition, the control part 34 drives a shutter driving part 34, it controls a shutter blade 20 into an opened condition for a prescribed time, and by irradiating a microcapsule paper 28 with a reflected light from an original by a prescribed light quantity degree, the red latent image is formed on the microcapsule surface of the microcapsule paper 28. In the same way, a green filter part 24G and a blue filter part 24B are positioned at the lower side of the lens 22, and the green and blue latent images are formed. Thus, the adjustments of the hue and density of the color image can be easily executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in an image forming apparatus, particularly an image forming apparatus that forms a color image on a photosensitive recording medium.

[Prior Art] As is well known, image forming apparatuses are configured to expose a photosensitive recording medium to form a latent image and then develop this latent image to record an image. In this method, a photosensitive recording medium is exposed to light of each wavelength of red (R), green (G), and blue (B) to form a latent image, and then this latent image is developed to form a color image on the photosensitive recording medium. It is formed like this.

Conventionally, various types of color image forming apparatuses of this type have been known, such as silver halide photography, electrophotography, and inkjet photography. ), cyan (C) 3
In addition to the primary colors, black dye or pigment is subtractively mixed as needed, and the white color of the output base color is used to perform additive color mixing to express the pigment density of the color image.

In particular, since the dye density of a color image is determined by the density of each of the three colors, desired hue can be achieved by changing the density of these three colors.

A high density color image can be obtained.

For example, if you want to lower the density of the entire color image, 3
If you only need to lower the density of all colors, and if you want to make the image hue red without changing the density of the entire color image, use M
Then, adjustment may be made to increase the density of Y and lower the density of C.

For this reason, conventional color image forming apparatuses are provided with individual density adjustment dials for independently adjusting the density of each of these three colors, and the user adjusts each of these density setting dials before forming an image. It is formed like this.

[Problems to be Solved by the Invention] However, in order to obtain a color image with a predetermined density and tone while adjusting the density of all three colors in a well-balanced manner, skill is required, and in most cases, the output is difficult. There is a problem in that it is necessary to judge by trial and error which colors to increase and which colors to decrease while comparing the obtained color image with a document or a desired output image.

In particular, it is thought that such color image forming apparatuses will become widely used in general households in the future. There is a need for a configuration in which users such as housewives and children can easily adjust the hue and density, and an effective measure for this purpose has been desired.

The present invention has been made in view of such conventional problems, and its purpose is to easily adjust the hue and density of a color image without requiring special skill. An object of the present invention is to provide a color image forming apparatus.

[Means for Solving the Problems] In order to achieve the above object, the present invention exposes a photosensitive recording medium to light of at least two or more wavelengths to form a latent image, and develops the latent image to expose it to light. In an image forming apparatus that forms a color image on a recording medium, there is provided a means for setting the hue and density of an output color image, and a table in which the exposure amount of each wavelength light corresponding to the hue and density is stored and set in advance. comprising an exposure amount setting means for determining the exposure amount of each wavelength light corresponding to the hue and density, and an exposure amount control means for controlling the exposure amount of each wavelength light for the photosensitive recording medium according to the determined exposure amount, It is characterized by automatically adjusting the tone of the output color image.

Further, according to the apparatus described in claim (2), the exposure amount setting means stores in advance a table of exposure amounts of red, green, and blue corresponding to hue and density, and stores the exposure amounts of red, green, and blue corresponding to hue and density in advance, and and the exposure amount control means is configured to determine the exposure amount of red, green, and blue corresponding to the density, and the exposure amount control means controls the amount of exposure of red, green, and blue to the photosensitive recording medium according to the determined exposure amount. It is characterized by being formed.

[Work] Next, the present invention will be explained in detail.

The present invention is characterized in that the exposure amount of each wavelength light corresponding to the hue and density is stored in advance in a table.

Then, when the user sets the hue and density of the output color image, the exposure amount determination means determines the exposure amount of each wavelength light corresponding to the set hue and density based on the table, and the exposure amount control means determines the exposure amount of each wavelength light corresponding to the set hue and density. The direction is output.

The exposure amount control means controls the photosensitive recording medium to be exposed to light of each wavelength in accordance with the determined exposure amount so that a latent image is formed.

By developing the photosensitive recording medium on which the latent image has been formed in this way, a color image with a tone corresponding to the set hue and density is formed on the photosensitive recording medium.

As described above, according to the present invention, a color image of a desired tone can be formed on a photosensitive recording medium by simply setting the hue and density by the user, without requiring any special skill. It is extremely convenient to handle compared to conventional devices that adjust the color tone by setting Y, M, and C densities through trial and error.

[Example] Next, preferred embodiments of the present invention will be described based on the drawings.

FIRST EMBODIMENT FIG. 2 shows a preferred example of a photosensitive pressure-sensitive copying machine to which the present invention is applied, and the copying machine of this embodiment is designed to be capable of full-color copying.

The photosensitive recording medium (consisting of microcapsule paper and color developer paper) that enables such copying is disclosed in Japanese Patent Application Laid-Open No. 58-88.
This has been proposed in Publication No. 739, etc., and will not be described in detail here.

This photosensitive and pressure sensitive copying machine 1o has an original platen glass 12 on the top plate.
and an original platen cover 14 are provided, and an original platen glass 12 is provided.
It is formed so that a desired original can be placed face down on top.

Moreover, inside the frame 16 of this photosensitive and pressure sensitive copying machine 1o,
A pair of light sources 18.18 are provided below the document table glass 12 to illuminate the document.
The light emitted from 18 is formed so as to illuminate the entire surface of the document.

Then, the light reflected from the original is transmitted to the shutter blade 20.
Lens 22. The image is formed through a filter 24 onto a microcapsule paper 28 that is in close contact with the upper surface of an exposure table 26 .

The shutter blade 20 is controlled to open and close by a shutter drive unit 30. When the shutter blade 20 is controlled to be open, it transmits the reflected light from the document toward the lens 22, and when it is controlled to be closed, it transmits the reflected light from the document. It is designed to block light.

Further, the filter 24 is formed in a disc shape,
This disk is provided with a red filter section 24R that transmits only red light, a green filter section 24G that transmits only green light, and a blue filter section 24B that transmits only blue light. The center of rotation of this disc-shaped filter 24 is fixed to the rotating shaft of a step motor 32, and by controlling the rotation of this step motor, each of the filter parts 24R, 24G, and 24B can be selectively rotated. It is formed so as to be located on the optical path of the reflected light, that is, directly below the lens 22.

Further, the microcapsule paper 28 contains a dye precursor,
Microcapsules mainly containing a photocurable resin and a photopolymerization initiator are formed so as to be supported on the surface, and this microcapsule paper 28 is attached to the cartridge shaft 4.
2 is housed in a storage case 40 in a wound state.

This storage case 40 is detachably attached to a socket 44 provided on the right side of the frame 16.

The microcapsule paper 28 emerging from the left side of the storage case 40 passes through the upper surface of the exposure table 26 via a feed roller 46, is guided to a pressure developing roller 48, and is wound around a winding shaft 50.

That is, the microcapsule paper 28 is taken out from the storage case 40 with the microcapsule surface facing upward, and set in an unexposed state on the exposure table 26, where -
It will be stopped once.

In this state, the light source 18 is turned on, and the reflected light from the document is illuminated as an image on the surface of the microcapsule through the lens 22 and filter 24.

At this time, the control section 34 first controls the shutter drive section 30 to close the shutter 20 and block the reflected light. Then, the control unit 34 drives the step motor 32,
The red filter portion 24R of the filter 24 is controlled to be directly below the lens 22. In this state, the control unit 34 drives the shutter drive unit 34 to keep the shutter blade 20 open for a predetermined period of time, and irradiates the microcapsule paper 28 with a predetermined amount of light reflected from the document. As a result, a red latent image is formed on the microcapsule surface of the microcapsule paper 28.

Next, the control section 34 drives the step motor 32 to position the green filter section 24G of the filter 24 directly below the lens 22, and in this state controls the shutter blade 20 to open for a predetermined period of time.

As a result, the microcapsule paper 28 is exposed to the green wavelength light included in the light reflected from the original, and a green latent image is formed. Similarly, the control unit 34 drives the step motor 32 to position the blue filter portion 24B of the filter 24 below the lens 22, thereby forming a blue latent image on the microcapsule paper 28.

In this way, when red, green, and blue latent images are formed on the microcapsule surface of the microcapsule paper 28 with respective unique exposure amounts, the microcapsule paper 28 starts moving to the left in the figure.

Further, a developer paper cassette 60 is installed on the left side of the frame 16, located above the pressure developing roller 48, and storing a cut paper type developer paper 62.
The sheets are taken out one by one by the half-moon roller 64 and guided to pressure developing rollers 48, 48 via a conveyance path 66. and,
The color developing paper 62 is brought into close contact with the microcapsule surface of the microcapsule paper 28 and is integrated with the pressure developing roller 48.
48° and pressure is applied. This pressure destroys the unexposed microcapsules and forms an image on the color developing paper 62.

Then, the color developing paper 62 that comes out of the pressure developing roller 48 is separated from the microcapsule paper 28 and guided to the heat roller 68.
Here, color development is promoted by the heat of the roller 68 to form a color image, and then the paper is delivered to a paper discharge tray 70 with the color image side facing up.

Next, the main parts of the present invention will be explained in detail.

In the photosensitive and pressure sensitive copying machine 10 of the embodiment, an original set on the platen glass 12 is color-copied onto the developer paper 62. At this time, the density and hue of the color image copied onto the developer paper 62 are controlled. For adjustment, a density adjustment dial 80 and a hue adjustment dial 82 as shown in FIG. 3 are provided on the upper surface of the frame 6.

The outputs of these dials 80 and 82 are
4 is entered.

A feature of the present invention is that by simply setting the desired density and hue by the user using the dials 80 and 82, a color image corresponding to the set density and hue can be automatically formed. be.

FIG. 1 shows a control section 34 of a photosensitive and pressure sensitive copying machine 10 according to an embodiment.
The color tone adjustment circuit provided therein is shown.

In the color tone adjustment circuit of the embodiment, the exposure amounts of R, G, and B corresponding to the hue and density are stored in advance in a table form, and the exposure amounts of R, G, and B corresponding to the set hue and density are determined. It includes an exposure amount determination circuit 84 and an exposure amount control circuit 86 that controls the exposure amount of R, G, and B to the microcapsule paper 28 according to the determined exposure amount.

In the embodiment, the exposure amount setting circuit 84 includes a table memory 88 and an exposure amount calculation circuit 90.

In the table memory 88, as shown in FIG. 4(A), the total exposure amounts of R, G, and B corresponding to the densities are stored in advance in a table format, and as shown in FIG. 4(B), In addition, R and G corresponding to the hue.

The exposure amount ratio of B is stored as a table.

Here, the exposure amount for the microcapsule paper 28 can be set by the opening control time T of the shutter blade 20, by adjusting the light amount of the light source 18, or by other means. can. In this embodiment, the opening time T of the shutter blade 20 is
The exposure amount is set by controlling the

Then, the exposure calculation circuit 90 first calculates the density as shown in FIG. 4(A) based on the density set by the density setting dial 80.
Using the table shown below, the total exposure amount T for each wavelength of R, G, and B light is determined. Then, using the obtained total exposure amount T and the table shown in FIG. 4(B), the R, G, and H exposure times TR+TG+TB corresponding to the hue C set by the hue setting dial 82 are determined. . At this time, between these TR + T G + TB, T
=TR1T. The relationship +TB must hold true.

Then, the exposure time TR of each wavelength light of R, G, and B is determined.
, Tc, and "rB" are sequentially output to the control circuit 86.

Based on the signal input in this way, the control circuit 86 controls the step motor 22 so that the red filter section 24R of the filter 24 is located directly below the lens 22 when performing exposure with, for example, R wavelength light. Then, the shutter drive section 30 is controlled to open the shutter blade 20 for the input exposure time TR.

As a result, the red wavelength light included in the reflected light from the document causes the micro-force pull surface of the microcapsule paper 28 to
It is exposed for R time and an R latent image is formed.

Similarly, the control circuit 86 drives the step motor 22 so that the green filter 24G of the filter 24 is connected to the lens 22.
The shutter blade 20 is controlled to open directly under the TG dark period. Following this, the control circuit 86 similarly controls the blue filter section 24B to be located directly below the lens 22, and further controls the shutter blade 20 to be open for 18 hours.

By doing this, the microcapsule paper 28 on the exposure table 26 is exposed to R contained in the reflected light from the original.
TR, T, for each wavelength light of G and H.

After exposure for TB time, red, green, and blue latent images are formed.

As described above, according to the present invention, when the density setting dial 80 is set to Dl, for example, the total exposure time of R, G, and B is set to T1 from the table shown in FIG. 4(A).

Therefore, if the dial 80 is turned toward "dark", the exposure time will be shortened, resulting in an overall dark image, and if the dial 80 is turned toward "light", the exposure time will be lengthened, resulting in an overall pale image.

According to the present invention, the hue setting dial 82 is set to C.
When set to 1, the exposure time T R11T GI+ of each wavelength light of R, G, and B is set based on the table shown in FIG. 4(B).
T Bl is determined.

Here, the exposure time of the green light is T. 1 is not changed by the hue setting dial 82, and only the exposure times T R,, T, , for red and blue light are changed.

Therefore, depending on the setting position of the setting dial 80, the entire three lines shown in FIG. Can be adjusted within a range.

In this way, according to the invention, each dial 80.8
By simply setting the density D1 and hue C1 using 2,
R, G, B exposure time T RI IT G1+ T
B is automatically adjusted, and Y as before.

Compared to devices that adjust each concentration of MSC individually,
It will be appreciated that hue and density adjustment of color copies becomes much easier.

In this embodiment, the color tone adjustment circuit shown in FIG. 1 is implemented by the CPU 90. as shown in FIG. RAM92) ROM9
4. Non-volatile memory 96 and interface circuit 9
8.

The nonvolatile memory 96 is formed to function as the table memory 88 shown in FIG. Also ROM
A program is written in the CPU 94 so that the CPU 90 functions as the color tone adjustment circuit shown in FIG. The RAM 92 is configured such that calculation data of the CPU 90 is written at any time, and the ink-to-face circuit 98 is configured to accept various input devices such as the density setting dial 80.
° Connected to the hue setting dial 84. Furthermore, this interface circuit 98 is also connected to the shutter drive section 30 and the step motor 32.

The present embodiment has the above configuration, and its operation will be explained next.

First, when copying is to be performed using the photosensitive and pressure sensitive copying machine 10, the density setting dial 80 is used to set the copy density D1, and the hue setting dial 82 is used to set the hue C1 for color copying. Next, the document table cover 14 is opened and the document is placed on the document table glass 12, and then a start switch (not shown) is turned on.

As a result, the light sources 18, 18 are turned on with the unexposed microcapsule paper 28 pulled out onto the exposure table 26, and the original is irradiated.

At this time, the control section 34 first drives the step motor 32 and places the red filter section 24R of the filter 24 directly below the lens 22. Then, the set values DI and C1 of the dials 80 and 82 are read, and the red light exposure time TR1 corresponding to the density D1 and hue C1 is determined with reference to the table shown in FIG. 4(A).

Next, the control unit 34 controls the shutter drive unit 30 to
The shutter blade 2o is controlled to be open for 8 hours, and as a result, the red light component included in the reflected light from the original forms an image on the microcapsule surface of the microcapsule paper 28, and the latent image due to the red light, that is, the cyan capsule, is hardened. A latent image is formed.

Then, when the exposure time TRI has elapsed and the shutter blade 20 is controlled to close, the control section 34 drives the step motor 32 to arrange the green filter section 24G of the filter 24 directly below the lens 22. Then, as in the case of red exposure, the green exposure time T is determined based on the density D1 and hue C1 set values using the dials 80 and 82. , and perform green exposure.

Next, the control unit 34 similarly controls the blue filter unit 24.
B is placed directly below the lens 22, and the blue exposure time is T8.
1 and perform blue exposure.

When the above processing is completed, the winding shaft 50 rotates and the exposed microcapsule paper 28 is transferred to the pressure developing roller 48.
move it in the direction of In synchronization with this, the half-moon roller 44
rotates, takes out one sheet of color developer paper 62 from the color developer paper cassette 60, superimposes it on the exposed surface of the microcapsule paper 28, and presses it onto the pressure developing roller 48. ．． Two people were born between the ages of 48 and 48. As a result, the microcapsule paper 28 and the color developer paper 62 are pressed, and the latent image on the microcapsule paper 28 is developed and transferred onto the color developer paper 62.

Thereafter, the developing paper 62 is thermally fixed by a heat roller 68 and then discharged onto a tray 70 provided outside the copying machine 10.

In this way, according to this embodiment, by simply setting the density and hue/C using the dials 80 and 82 provided above the frame 16, the hue and density can be adjusted according to the set values. It is possible to make a color copy of a color image with a color image on the color developing paper 62.

Second Embodiment Next, a second preferred embodiment of the present invention will be described with reference to the drawings. Incidentally, members corresponding to those in the first embodiment are given the same reference numerals and their explanations will be omitted.

FIG. 6 shows a preferred embodiment of a copying machine 10 that forms color images using the electrofax method.
The copying machine 10 of the embodiment uses a photosensitive sheet S as a photosensitive recording medium.
Use. This photosensitive sheet S is made of titanium dioxide T i
A photosensitive layer in which O2 is dispersed in a binder is coated on a conductive substrate.

The photosensitive sheet S is then pulled out from the storage case 40 provided above the frame 16 using paper feed rollers 52 and 54. When the photosensitive sheet S is pulled out by the required amount, the paper cutter 56 rotates, the photosensitive sheet S is cut off, held once on the conveyor belt 110, and then transferred onto the paper stage 112. The paper stage 112 translates in the direction of the arrow in the figure, and when it reaches a predetermined position, rotates counterclockwise and becomes horizontal as shown by the two-dot chain line in the figure. At this time, the photosensitive sheet s is held on the upper surface of the paper stage 112.

Subsequently, the paper stage 112 and the tank unit 114 simultaneously move in the direction of the arrows in the figure so as to intersect with each other.
The positions of the paper stage 112 and the tank unit 1]-4 are exchanged as shown in FIG. 7, and when they intersect, the photosensitive sheet S is uniformly negatively charged by the action of the scorotron 16.

Then, paper stage 112 and tank unit 1]-
4 continues to advance to a predetermined position and stops, and then the paper stage 112 rotates 90 degrees counterclockwise to the position shown by the solid line, and is placed in a position where exposure is performed through the reflector 111.

In this state, the control section 34 controls the shutter drive section 30 and the step motor 32 in the same manner as in the first embodiment, and the step motor 32 selects the blue filter section 24B of the filter 24, and in this state, the light source 18 is lit. Then, the blue component of the reflected light from the original placed on the original platen glass 12 is imaged on the photosensitive sheet S for an exposure time TB1 during which the shutter blade 20 is controlled to be opened by the shutter drive unit 30, and the blue component is focused on the photosensitive sheet S. An electrostatic latent image is formed. Note that the method for determining the exposure time TBI at this time will be described in detail later.

After the exposure, the paper stage 112 is rotated counterclockwise again by 9.
The photosensitive sheet S is rotated by 0 degrees and becomes horizontal with the photosensitive sheet S held downward as shown by the two-dot chain line in FIG.

Subsequently, the paper stage 112 and the tank unit 114 simultaneously move in the direction of the arrow in the figure and intersect, but at this time, the photosensitive sheet S is first exposed using the auxiliary exposure unit 120 whose light intensity is adjusted by the control section 34, Photosensitive sheet S
The overall amount of charge is adjusted. Next, pre-wet device 1
22, the surface of the porous photosensitive sheet S is immersed in a solvent common to the developer prior to development, and then wet-developed with yellow toner by the developing unit Y in the tank unit 114. At this time, the developing bias is also adjusted using the control section 34.

The yellow toner excessively attached to the developed photosensitive sheet S is removed by squeeze rollers 126Y dedicated to each of Y, M, and C toners.

When this series of developing steps is completed, the arrangement of the paper stage 112 and the tank unit 114 is changed again, as shown in FIG. 6.

Then, the paper stage 112 is controlled in attitude so as to hold the photosensitive sheet S having a 180-degree rotated yellow image on its upper surface.

When the yellow drawing is completed, the magenta drawing is subsequently performed in the same procedure. The difference from Yellow's drawing is that
Prior to the charging step by the scorotron 116, the photosensitive sheet S is neutralized by the corotron 128. From then on, the photosensitive sheet S is uniformly charged, exposed to green light, and developed with magenta toner in the same manner as in the yellow image formation.

Furthermore, a cyan image is drawn by the same operation, and a full-color image is formed on the photosensitive sheet S.

Then, the paper stage 112 rotates to the solid line position shown in FIG.
is transferred to the conveyor belt 110. And the conveyor belt 110
and 130 are used to discharge the photosensitive sheet S onto a paper discharge tray 70 provided at the top of the frame 14 with the color screen facing upward.

In this way, the copying machine 10 of the embodiment has the photosensitive sheet S.
A full color image of the original is copied above.

Further, in order to adjust the density and hue of a full-color image, a density setting volume 80 and a hue setting volume 82 as shown in FIG. 8 are provided on the upper part of the frame 14.
The set value is input to the control section 34.

FIG. 9 shows the color tone control circuit of this embodiment provided in this control section 34, and the feature of this embodiment is that the color tone control circuit of FIGS. The reason is that the four tables shown in the figure are stored in advance.

Here, the tables shown in FIGS. 10(A) and 10(B) are the same as the tables shown in FIGS. 4(A) and 4(B), so a description thereof will be omitted here.

Further, the table shown in FIG. 10(C) shows the relationship between the grid voltage V of the scorotron 116 and the concentration. The device of the embodiment measures this correspondence relationship in advance and stores it in the memory 8.
Register on 8. Further, the table shown in FIG. 10(D) shows the relationship between the exposure amount of the auxiliary exposure unit 120 and the exposure time of each color light. The apparatus of the embodiment measures this relationship in advance and registers it in the table memory 88.

Then, the exposure amount calculation circuit 90 performs the following operations according to each table shown in FIG. 10 registered in advance in the table memory 88.
R, G corresponding to the density and hue C set by each dial 80.82.

In addition to determining each exposure amount of B, the scorotron 11
The grid voltage V1 of No. 6 and the auxiliary exposure amount of the auxiliary exposure unit 120 are automatically determined.

Then, the control circuit 86 controls the shutter driving section 30. based on the value determined in this way. Step motor 32. The corotron 128 and the auxiliary exposure unit 120 are controlled to automatically form a full-color image on the photosensitive sheet S corresponding to the set density and hue.

For example, as shown in FIG. 8, each volume 80.82
When the density is set to DI and the hue is set to 01 using
R and G from each table shown in the figure.

Each exposure amount of B is determined as LR□+LGI+LBl, and the auxiliary exposure amount is "2 + grid voltage is V.
Yes, it is automatically determined.

Then, based on the determined values, each part of the circuit is controlled by the control unit 34, and first a yellow image is formed on the photosensitive sheet S, then a magenta image is formed, and finally a cyan image is formed. .

In this way, according to the copying machine 10 of this embodiment, by simply setting the density and hue using the volumes 80 and 82, a full-color image corresponding to the density and hue that has been automatically set can be created on the photosensitive sheet. It will be copied above.

In each of the above embodiments, as shown in FIGS. 4 and 10, there is a linear relationship between the position of the dial 80 and 82 and the exposure time in each case, but the relationship may be changed as necessary. A table may be formed using this as an appropriate curve, and the way the red light and blue light change may differ depending on the position of the density setting dial 80.

Further, in the above embodiments, exposure is performed using blue light, green light, and red light, but the present invention is not limited to this, and it is also possible to perform similar exposure using, for example, yellow, magenta, and cyan light.

Further, in each of the above embodiments, the exposure amount is adjusted by controlling the exposure time, but the present invention is not limited to this, and the exposure amount can be adjusted by, for example, changing the light amount of a light source, adjusting the transmittance of a filter, etc. Adjustments may be made.

Further, in the second embodiment, each dial 80.8
Although the position No. 2, the grid voltage v1, and the auxiliary exposure amount have a linear relationship, the present invention is not limited to this, and it is also possible to form an appropriate curve as necessary.

Furthermore, in the second embodiment, the grid voltage V and the auxiliary exposure amount are constant for the three colors R, G, and B.
The present invention is not limited to this, but a different grid voltage table and auxiliary exposure amount table may be created for each color, and these grid voltages and auxiliary exposure amounts may be set according to each of R, G, and B.

Furthermore, in the embodiment described above, the exposure amounts of R, G, and B are determined by calculation using a CPU.
The present invention is not limited to this, but is a circuit using hardware,
It is also possible to output the R, G, and B exposure amounts directly from the density and hue setting values.

Furthermore, in each of the above embodiments, the present invention was explained by taking as an example a case where the present invention is applied to a copying machine, but the present invention is not limited to this, and can be widely used in various applications such as a color laser printer, a color inkjet printer, etc. and
For example, when the present invention is used in these color laser printers and color inkjet printers, by making the contrast configurable, it becomes possible to adjust colors over a wider range.

[Effects of the Invention] As explained above, according to the present invention, by simply setting the hue and density, the user can generate light of two or more wavelengths, especially RlG and B, with sensitivities according to the set values. Since the amount of exposure of the wavelength light is automatically adjusted, there is an effect that even if the user is not skilled in color adjustment, the tone of the color image can be easily adjusted.

[Brief explanation of drawings]

FIG. 1 is a block circuit diagram showing an example of a color tone adjustment circuit used in an image forming apparatus according to the present invention, FIG. 2 is a schematic cross-sectional view of a photosensitive pressure-sensitive copying machine to which the present invention is applied, and FIG. FIG. 2 is an explanatory diagram of the density and color tone setting dials provided in the photosensitive and pressure-sensitive copying machine, and FIG. 4 is an explanatory diagram of a table that is preset and registered in the table memory of the circuit shown in FIG. Figure (A) is an explanatory diagram of the total exposure amount of R, G, and B corresponding to the density, and Figure (B) is an explanatory diagram showing the correspondence relationship between the hue and the exposure amount of R, G, and B. 1 is a block circuit diagram showing a specific example of the circuit shown in FIG. 1 formed using a CPU, and FIGS. 6 and 7 show an example in which the present invention is applied to a copying machine that forms images using the electrofax method. FIG. 8 is an explanatory diagram of the density and hue setting dials provided in the apparatus shown in FIGS. 6 and 7, and FIG. 9 is an explanatory diagram of the circuit shown in FIGS. 7 and 8. FIG. 10, a block diagram of the color tone adjustment circuit used, is an explanatory diagram of each table set and registered in advance in the table memory of FIG. 9. 80... Density adjustment dial, 82... Hue adjustment dial, 84... Exposure amount control circuit, 86... Exposure amount determination circuit, 88... Table memory, 90... Exposure amount calculation circuit. Agent Patent Attorney Inoue - (2 others) No. 10 (A) (B) (C) (D) Tankai

Claims (3)

[Claims] (1) In a color image forming apparatus that exposes a photosensitive recording medium to light of at least two or more wavelengths to form a latent image, and develops this latent image to form a color image on the photosensitive recording medium, an output color image is provided. means for setting the hue and density of the light, and an exposure amount for determining the exposure amount of each wavelength light corresponding to the set hue and density, in which the exposure amount of each wavelength light corresponding to the hue and density is stored in advance as a table. a setting means; and an exposure amount control means for controlling the exposure amount of each wavelength light to the photosensitive recording medium according to the determined exposure amount, and the color image is characterized in that the color tone of the outputted color image is automatically adjusted. Image forming device. (2) In the apparatus according to claim (1), the exposure amount setting means stores the exposure amounts of red, green, and blue corresponding to the hue and density in advance in a table, and The exposure amount control means is formed to determine the exposure amount of red, green, and blue corresponding to the density, and the exposure amount control means is formed to control the exposure amount of red, green, and blue to the photosensitive recording medium according to the determined exposure amount. A color image forming apparatus characterized by: (3) In the apparatus according to any one of claims (1) and (2), the exposure amount setting means stores in advance a table of the total exposure amount of each wavelength light corresponding to the density, and , the ratio of the exposure amount of each wavelength light corresponding to the color tone is stored as a table, and based on these tables, the exposure amount of each wavelength light corresponding to the set hue and density is determined. Characteristic color image forming device.