JPH0651603A - Image forming controller - Google Patents

Abstract

PURPOSE:To correct a control voltage so that optimum image quality may be obtained even when the image forming characteristic of an electrostatic image forming system is changed. CONSTITUTION:The control voltage is controlled so as to obtain the optimum image quality by correcting the control voltage based on a value obtained by feeding back a difference between an output voltage from a neurocomputer 73 and a previously decided ideal value from the output side to the input side of the neurocomputer 73 by using the neurocomputer 73 which learns the characteristic of toner concentration value obtained for a set of original density and control voltage value in an image forming system. By allowing the neurocomputer 73 to relearn the characteristic of the toner concentration value obtained for the set of original density and control voltage value measured by using a reference density original 49 and a toner concentration sensor 52, the correct correction amount of the control voltage value is always obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming control device such as a copying machine or a facsimile using an electrophotographic system.

[0002]

2. Description of the Related Art First, a copying process of a copying machine as an electrophotographic apparatus is shown in FIG.
This will be described with reference to FIG.

A document transport device 2 for automatically transporting a document is provided above the main body 1 of the copying machine, and a document 4 set on a document table 3 is fed to an exposure position 5. The exposure lamp 6 is driven by an AC power source (not shown) to illuminate the fed original 7.

The reflected light from the original is reflected by the mirror 8,
An image is formed on the photoconductor 11 charged by the charger 10 through the lens 9. The photoconductor 11 is exposed to the reflected light, its resistance value is reduced, and the charge is discharged, whereby an electrostatic latent image is formed on the photoconductor 11. When the electrostatic latent image moves to the developing unit 12, the toner 14 adheres to the photoconductor 11 due to the difference between the potential of the photoconductor 11 and the potential applied to the developing tank 13, and the toner 14 adheres.
The electrostatic latent image becomes a visible image (toner image) (development of the photoconductor 11). Next, the paper 16 is fed from the paper cassette 15, and the toner is transferred to the paper 16 in the transfer unit 17. The paper 18 on which the toner image is transferred is fixed by the fixing device 19 and then discharged to the outside of the machine.

At the time of the above transfer, the toner remaining on the photoconductor 11 without being transferred to the paper 16 is removed by the cleaner 20.

As described above, the image forming operation in the copying machine is
It is roughly divided into three types: exposure of an original document / potential formation of a photoconductor / development of a photoconductor. And to control the copy quality,
The voltage applied to the exposure lamp 6 and the output voltage of the charger 10 are corrected.

FIG. 16 shows characteristics relating to image formation of a copying machine.
The characteristics of each block are shown by dividing each block into exposure of a document / potential formation of a photoconductor / development of a photoconductor. That is, in the characteristic diagram a shown in FIG. 16, the horizontal axis represents the optical density D of the original document, and the vertical axis represents the common logarithm of the reflected light amount from the original document. The relationship between the optical density D of the original document and the amount of light X reflected from the image of the original document is shown in the following formula 1.

[0008]

[Equation 1] In Expression 1, Xm is the amount of light reflected from the background. As the amount of light reflected from the background, the amount of light reflected from white paper is usually used.

In the characteristic diagram b shown in FIG. 16, the vertical axis represents the common logarithm of the amount of light incident on the photoconductor (= the amount of light reflected from the original), and the horizontal axis represents the potential of the photoconductor after exposure. .

In the characteristic diagram c shown in FIG. 16, the horizontal axis represents the potential of the photoconductor and the vertical axis represents the density of the developed toner image.

In the characteristic diagram d shown in FIG. 16, the horizontal axis represents the optical density D of the original and the vertical axis represents the toner image density.

As can be seen from FIG. 16, FIG. 16 is a characteristic diagram a
→ Characteristic diagram b → By tracing the characteristic diagram c, the characteristic diagram d of the toner image density can be synthesized and the copy image quality can be determined.

Normally, even when the exposure lamp voltage or the output voltage value of the high-voltage power source connected to the charger is kept constant, it is affected by temperature and humidity changes, abrasion of the photoconductor, contamination of the exposure lamp and charger, etc. The characteristics of the characteristic diagram a, the characteristic diagram b, and the characteristic diagram c of FIG. 16 change.

For example, as shown in the characteristic diagram a of FIG. 16, if only the characteristic of the exposed portion with respect to the exposure voltage changes from the characteristic 21 to the characteristic 22, the characteristic shown in the characteristic diagram d changes from the characteristic 26 to the characteristic 27. And changes.

According to the characteristic 26 of the characteristic diagram d, a good copy image quality can be obtained, but according to the characteristic 27 of the characteristic diagram d, the toner image density becomes high and the dark copy image quality is obtained.

Further, if only the characteristic of the photoreceptor potential with respect to the amount of light incident on the photoreceptor shown in the characteristic diagram b of FIG. 16 changes from the characteristic 23 to the characteristic 24, the characteristic diagram d of FIG. 16 can be obtained. The characteristic changes from the characteristic 26 to the characteristic 28, and the toner image density becomes low as a whole, resulting in a bright copy image quality.

In this way, temperature and humidity changes, wear of the photoreceptor,
Due to the effects of dirt on the exposure lamp and charger, the characteristics shown in Fig. 16
Since the characteristics of a, characteristic chart b, and characteristic chart c change, the output voltage value of the exposure lamp voltage and the high-voltage power supply connected to the charger is kept constant, and the control voltage value for exposure / charging is kept constant. Therefore, it is impossible to maintain a good copy image quality for a long time.

Needless to say, in the electrophotographic copying machine, it is desirable that the density of the toner image formed on the paper is stable.

However, as described above, the characteristics of the exposure lamp, the photoconductor, the developer, etc. change due to various factors such as temperature, humidity, dirt, wear, and changes in material characteristics, and as a result, the density of the toner image is changed. Changes.

Therefore, conventionally, in order to prevent the toner image density change, in the process from the exposure of the document to the formation of the toner image, the exposure amount and the charge amount of the photoconductor are controlled to change the toner image density. Various devices for correcting minutes have been proposed and implemented.

As a first conventional example, an exposure condition for latent image formation or a development condition for latent image visualization is controlled from a signal corresponding to an image of a bright portion formed on a photoconductor, A device for controlling the charging condition of the electrostatic latent image forming member from a signal corresponding to the image of the dark portion has been proposed (Japanese Patent Publication No. 61-295).
02). The bright portion means the toner image formed in the portion 29 where the optical density D of the original is about 0.5 or less in the characteristic diagram d of FIG. Also, the dark area is shown in FIG.
In the characteristic diagram d, the toner image formed in the portion 30 where the optical density D of the document is about 1.0 or more is meant.

When only the exposure characteristic shown in the characteristic diagram a of FIG. 16 changes from the characteristic 21 to the characteristic 22,
The characteristic shown in the characteristic diagram d of 6 changes from the characteristic 26 to the characteristic 27. Regarding the change from the characteristics 26 to 27, the characteristic change of the portion 29 (bright portion) is larger than the characteristic change of the portion 30 (dark portion). On the other hand, only the charging characteristic of the photoconductor shown in the characteristic diagram b of FIG. 16 changes, and the characteristic shown in the characteristic diagram d is the characteristic 2
When changing from 6 to the characteristic 28, the characteristic change of the portion 30 (dark portion) is larger than the characteristic change of the portion 29 (light portion).
Therefore, in such a case, the first conventional example in which the exposure condition or the image condition is controlled from the signal corresponding to the toner image in the bright portion and the charging condition is controlled from the signal corresponding to the toner image in the dark portion is effective. Is.

Next, as a second conventional example, the toner image density created with a specific control voltage value (a voltage value for controlling the charging voltage value of the photoconductor) at the stage where the image quality of the copying machine is initially adjusted. The value of the toner image density detected at the stage of the initial adjustment is stored as a reference value of the toner image density value for controlling the control voltage value, as well as detected by the reflection type optical sensor. There is implemented a device for performing a similar toner image density detection operation and converting the difference between the detected toner image density value and the reference value of the toner image density value into a correction amount of the charging voltage value of the photoconductor.

As a third conventional example, the change amount of temperature and humidity in the copying machine and the change in sensitivity of the photoconductor, which are some of the factors that cause the characteristic change (change of toner image density value), are measured, and the measurement result is obtained. Has proposed a device for obtaining a correction value for the control voltage of the photoconductor. (For example, "Electrophotographic process control method using neural network and fuzzy theory", IEICE Proceeding 91-05-05)

However, the above-mentioned first conventional example (Japanese Patent Publication No. 61-29502) is, however, not as shown in FIG.
When the exposure characteristic shown in the characteristic diagram a of FIG. 6 changes from the characteristic 21 to the characteristic 22 and the charging characteristic of the photoconductor shown in the characteristic diagram b of FIG. 16 also changes from the characteristic 23 to the characteristic 24,
As indicated by the characteristic 31 in the characteristic diagram d of No. 6, the change in the density characteristic corresponding to the change in the exposure characteristic and the change in the density characteristic corresponding to the change in the charging characteristic may be offset. In other words, if both charging and exposure characteristics change,
On the contrary, compared to the case where only one of the charging characteristic or the exposure characteristic changes, the change in the density characteristic becomes smaller, or the change in the charge characteristic affects the density characteristic and the change in the exposure characteristic affects the density characteristic. It may be hidden.

Therefore, when both the charging characteristic and the exposure characteristic are changed, the exposure condition or the developing condition is controlled from the signal corresponding to the toner image in the light portion, while the charging condition is changed from the signal corresponding to the toner image in the dark portion. In the first conventional example in which the toner image density is controlled, for example, as shown by a broken line in FIG. 11, the change from the initial characteristics of the toner image density characteristics cannot be sufficiently corrected, and the toner image density cannot always be stabilized. There is.

Further, in the second conventional example in which the change in the toner image density or the like is measured to correct the change in the image quality, it is determined which part of the image forming system such as exposure, charging and development changes the image quality. Since it cannot be specified, there is a problem that a plurality of control values cannot be collectively corrected and the best control value cannot always be determined.

A third method for measuring environmental changes such as temperature and humidity
In the conventional example, it is necessary to measure the temperature and humidity, the photoconductor potential, etc., and therefore there is a problem such as an increase in cost due to the provision of a temperature sensor, a humidity sensor, a potential sensor, and an extra space in the device. In addition, there is a problem that factors such as stains that are difficult to measure cannot be dealt with.

The above-mentioned first to third conventional examples all correct the initially adjusted control value, and cannot be adapted to the initial adjustment for absorbing the variations of individual machines. .

Therefore, in addition to the correction for suppressing the above-described change of toner image forming characteristics with time, even when the photoconductor or the like maintains the characteristics in the initial state, each machine (copier, etc.) In order to absorb variations in toner image formation characteristics in the above, the exposure voltage and the charging voltage are currently manually adjusted at the production stage, at the time of installing a machine, or at the time of maintenance.

This situation is the same not only in a copying machine that exposes a photoconductor by light reflected from an original, but also in a printer or a facsimile that employs an electrophotographic system. Electrophotographic printers and facsimiles differ from copying machines only in that the output of the exposure device is changed by laser light or the like according to the input image signal to expose the photoconductor.

Therefore, an object of the present invention is to provide an image forming control apparatus capable of correcting the toner image density characteristic by correcting the control voltage of the image forming system with respect to changes and variations in the image forming characteristic of the image forming system. To provide.

[0032]

In order to achieve the above object, the invention according to claim 1 forms the toner image density value corresponding to the document density value, and the image forming section. The voltage control means for storing the control voltage value affecting the toner image density and outputting the control voltage value to the image forming section, the reference document density value, and the reference toner image density value corresponding to the reference document density value And a density relation generating means for outputting the reference document density value and the reference toner image density value, a control voltage value input to the image forming section, the document density value, and the document density. It is pre-learned so as to reproduce the relationship with the toner image density value generated by the image forming unit corresponding to the value, has a fixed internal coupling, and is input from the density relationship generating means to the input side. The standard original density value Based on the control voltage value input from the pressure control means to the input side, the toner image density value according to the internal coupling is calculated, and the calculated toner image density value and the density relationship generating means are output to the output side. Based on the difference from the input reference toner image density value, feedback is performed from the output side to the input side, and the control voltage value corrected so that the calculated toner image density value approaches the reference density value is output to the input side. And a neuro computer for correcting the control voltage value stored in the voltage control means to the corrected control voltage value.

Further, according to a second aspect of the present invention, an image forming unit for forming a toner image density value corresponding to a document density value and a control voltage value affecting the toner image density formed by the image forming unit are set. In addition to storing the voltage control means for storing and outputting the control voltage value to the image forming section, the reference document density value and the reference toner image density value corresponding to the reference document density value, the reference document is also stored. A density relation generating means for outputting a density value and a reference toner image density value; a reference document means; and a reference density output means for detecting the reference density of the reference document means and outputting the reference density value of the reference document means. A toner density detecting means for detecting a toner image density value of a toner image of the reference original means generated based on a control voltage value output by the voltage control means; and a reference density value from the reference density output means, the above By inputting the control voltage value when the image section generates the toner image of the reference original document means and the toner image density value detected by the toner density detecting means to the output side, The internal coupling is changed so that the relationship between the reference density value input to the input side and the control voltage value and the toner image density value input to the output side can be reproduced, while the density relationship generating means is used. Based on the reference document density value input to the input side and the control voltage value input to the input side from the voltage control means,
The toner image density value according to the internal coupling is calculated, and the output side is calculated based on the difference between the calculated toner image density value and the reference toner image density value input from the density relationship generating means to the output side. Is fed back to the input side, the control voltage value corrected so that the calculated toner image density value approaches the reference density value is output to the input side, and the control voltage value stored in the voltage control means is It is characterized in that it is provided with a neuro computer that corrects to a corrected control voltage value.

Further, the invention according to claim 3 stores an image forming section for forming a toner image density value corresponding to a document density value, and a control voltage value affecting the toner image density formed by the image forming section. At the same time, the voltage control means for outputting the control voltage value to the image forming section, the reference document means, and the reference density of the reference document means are detected to output the reference density value of the reference document means. Means, a toner density detecting means for detecting a toner image density value of the toner image of the reference original generated by the image forming section based on the control voltage value output by the voltage control means, and an input to the image forming section. Control voltage value
The document density value and the toner image density value generated by the image forming section corresponding to the document density value are learned in advance so as to be reproduced, and have a fixed internal coupling, and the reference density A toner image density value corresponding to the internal coupling is calculated based on the reference density value of the reference original document means input from the output means to the input side and the control voltage value input to the input side from the voltage control means. Based on the difference between the calculated toner image density value and the toner image density value of the reference original document means input to the output side from the toner density detection means, feedback is performed from the output side to the input side to calculate the toner The control voltage value corrected so that the image density value approaches the toner image density value of the reference original means is output to the input side, and the control voltage value stored in the voltage control means is changed to the corrected control voltage value. Fixed on Is characterized in that a neuro-computer for.

[0035]

According to the first aspect of the present invention, the control voltage value input to the image forming unit, the document density value, and the toner image density value generated by the image forming unit corresponding to the document density value. A neurocomputer pre-learned so as to reproduce the relationship with the above, outputs a control voltage value corrected so that the calculated toner image density value approaches the reference density value to the input side, and the voltage control means stores it. The control voltage value being corrected is corrected to the corrected control voltage value.

That is, under the regulation of the internal coupling of the neurocomputer, the stored value of the voltage control means is changed so that the output characteristic of the neurocomputer with respect to the document density input and the characteristic of the density relation generating means coincide with each other. .

Therefore, if the density relation generating means is set so as to output the target image forming characteristic in the actual image forming system, the target is obtained with respect to the image forming characteristic expressed by the internal coupling of the neuro computer. The optimum control voltage value for realizing the image forming characteristic is set in the voltage control means.

According to the second aspect of the present invention, as in the first aspect of the invention, the density relation generating means outputs the target image forming characteristic in the actual image forming system. If set, the optimum control voltage value for realizing the target image forming characteristic is set in the voltage control means with respect to the image forming characteristic expressed by the internal coupling of the neuro computer, and the neuro computer is The reference density value from the reference density output means and the control voltage value when the image forming section forms the toner image of the reference original means are input to the input side, and the toner detected by the toner density detecting means is input. By inputting the image density value to the output side, it is possible to reproduce the relationship between the reference density value and the control voltage value input to the input side and the toner image density value input to the output side. The bond has changed .

That is, when the characteristics of the image forming system change,
The internal coupling of the neurocomputer can be changed according to the characteristic change, and the optimum control voltage value is always set in the voltage control means.

According to the third aspect of the invention, the control voltage value input to the image forming section, the document density value, and the toner image generated by the image forming section corresponding to the document density value. The neurocomputer having a fixed internal coupling, which is pre-learned so that the relationship with the density value can be reproduced, has a reference density value of the reference document means input to the input side from the reference density output means and the voltage control means. Output to the input side a control voltage value corrected so that the toner image density value calculated based on the control voltage value input from the input side to the toner image density value of the reference document means is output to the voltage control means. The control voltage value stored by is corrected to the corrected control voltage value.

Therefore, when the characteristic of the image forming system changes, the amount of feedback to the voltage control means changes according to the amount of change in the characteristic, and the optimum control voltage value is changed without changing the internal coupling of the neurocomputer. It is set in the voltage control means.

[0042]

The present invention will be described in detail below with reference to the embodiments shown in the drawings.

FIG. 1 shows the construction of the image forming control apparatus of the copying machine according to the first embodiment which is an embodiment of the image forming control apparatus of the present invention.

The exposure lamp 6 is turned on by an AC power source (not shown), and the exposure lamp regulator 32 changes the voltage application time in the AC waveform to control the exposure voltage. The control input of the exposure lamp regulator 32 is connected to the exposure voltage controller 33. The exposure voltage control section 33 is connected to an exposure voltage storage section 34 that stores the exposure voltage value at the time of copying. The exposure voltage control unit 33 and the exposure voltage storage unit 34 constitute exposure voltage control means. The light from the exposure lamp 6 is reflected by the original 7,
It is incident on the charged photoconductor 11.

A high voltage from the high voltage power source 35 is applied to the charger 10 to charge the photoconductor 11 to a predetermined potential. The control input of the high-voltage power supply 35 is connected to the charging voltage controller 36. The charging voltage control unit 36 is connected to a charging voltage storage unit 37 that stores the charging voltage value at the time of copying. The charging voltage control unit 36 and the charging voltage storage unit 37 constitute charging voltage control means.

As shown in FIG. 2, the density relationship generator 38 is composed of a ROM 39 in which four sets of ideal toner image density values for certain document density values at the time of copying are stored. As shown in FIG. 3, the document density value TABLE
1 and toner image density value TABLE2 (0.4, 0.1
35) to (1.2, 1.336), as shown in FIG.
The group numbers from 0 to 3 are given, and the group numbers are used as digital signals from the controller 40 to the concentration relationship generator 38.
It is input to the address line 41 of the ROM 39. ROM3
When the group number is input to the address line 41 of No. 9, RO
The original document density value and the toner image density value corresponding to the group number are output to the data lines 42-1 and 42-2 of M39.

The neuro computer 43 has an input layer 4
4, the intermediate layer 45, and the output layer 46 have a three-layer structure.

The input layer 44 includes the input unit 44-1 and
The input unit 44-2 and the input unit 44-3 are provided. The document density value generated by the density relationship generator 38 is input to the input unit 44-1. The exposure voltage value stored in the exposure voltage storage unit 34 is input to the input unit 44-2. The charging voltage value stored in the charging voltage storage unit 37 is input to the input unit 44-3.

The intermediate layer 45 comprises ten similar units 4
5-1 to 45-10 are provided. Each unit 45-1
~ 45-10 are coupled to input units 44-1 and 44-2 and 44-3, respectively. However, the units of the intermediate layer 45 are not bonded to each other. The coupling between the input layer 44 and the intermediate layer 45 has a unique coupling amount.
The output value O2j of the jth unit of the intermediate layer 45 is equal to the output value O1i of the ith unit of the input layer 44 and the i of the input layer 44.
The amount of coupling W1ij from the j-th unit of the intermediate layer 45 to the j-th unit of the intermediate layer 45 and the threshold value W10j of the j-th unit of the intermediate layer can be used to calculate by the following equation 2.
In Equation 2, f represents a sigmoid function. This sigmoid function f is expressed by the following equation 3.

[0050]

[Equation 2]

[0051]

[Equation 3] The output layer 46 is composed of one output unit, and is connected to each of the units 45-1 to 45-10 of the intermediate layer 45 with its own strength.

The output value O3 of the output unit is the strength W2j of the coupling between the output layer 46 and the j-th unit 45-j of the intermediate layer 45, and the threshold value W2 of the output unit.
It is calculated by the following equation 4 using 0. In Equation 4, f
Is a sigmoid function.

[0053]

[Equation 4] When the exposure voltage value, the charging voltage value, and the document density are given to the input layer 44, the neuro computer 43 causes the image forming unit including the exposure lamp 6 and the charger 10 to cause the exposure voltage value, the charging voltage value, and the document to be read. In order to output the toner image density value of the toner image created according to the density from the output layer 46,
Its internal coupling has been determined. In other words, the neuro computer 43 previously sets the image forming characteristics of the image forming unit as follows.
Have been learned.

Next, in the first embodiment described above, the exposure voltage value and the charging voltage value for obtaining an appropriate copy image quality are stored in the exposure voltage storage section of each voltage control means (exposure voltage control means and charging voltage control means). The procedure of setting the voltage in the charging voltage storage unit 34 and the charging voltage storage unit 37 will be described with reference to the flowchart shown in FIG.

First, the controller 40 gives the density relation generator 38 a set number 0 (step S2). Then,
The concentration relationship generator 38 uses the unit 44-1 of the input layer 44 via the data line 42-1 and the data line 42-2.
Then, the document density 0.4 and the toner density Dti of 0.135 are output to the output layer 46 (step S3).

Next, a document density of 0.4 is input to the input unit 44-1 of the neuro computer 43 (step S
4), the exposure voltage value Vc stored in the exposure voltage storage unit 34 is input to the input unit 44-2 (step S5),
The charging voltage value Vg stored in the charging voltage storage unit 37 is input to the input unit 44-3 (step S6).

Next, the output value O2j of each unit of the intermediate layer 45 of the neurocomputer 43 and the output value O3 of the output layer 46 are calculated according to the above equations 2 and 4 (steps S7 to S21). Then, the difference between the output value O3 of the output layer 46 and the toner density Dti = 0.135 output by the density relationship generator 38 is obtained, and from this difference, according to the following Equations 5 to 8, The correction amount in each layer 44 to 46 of the neuro computer 43 is calculated. In Equations 5 to 8, e3 is the error of the output layer, e2j is the error of the jth unit of the intermediate layer, e1i is the error of the ith unit of the input layer, and dVi is connected to the ith input unit. It is the correction amount of the control voltage value that is being applied. The above calculation is performed by the following equation 5 (steps S22 to S24) → equation 6 (steps S25 to S28) → equation 7 (steps S29)
-Step S34)-> Equation 8 (step S35). That is, the process is sequentially performed from the output layer 46 to the input layer 44, which is a kind of feedback (step S2).
2 to step S37).

[0058]

[Equation 5]

[0059]

[Equation 6]

[0060]

[Equation 7]

[0061]

[Equation 8] In Expression 8, ε1 is a minute value, and is 0.01 in this embodiment.

Based on the correction amount dVi of the control voltage value,
The exposure voltage value Vc stored in the exposure voltage storage unit 34 and the charging voltage value Vg stored in the charging voltage storage unit 37 are corrected (steps S38 and S39). Next, the controller 40 gives the group number 1 to the density relationship generator 38 (step S40), and the density relationship generator 38 sets the document density of 0.6 to the unit 44-1 of the input layer 44 and the toner density. Is output to the 0.522 output layer 46. Then, the control voltage values Vc and Vg are corrected again as in the case of the document density of 0.4 and the toner density of 0.135.

In the following, the density relation generating device 38 has a document density of 0.90 and a toner density of 1.137 for number 2, and a document density of 1.20 and a toner density of 1.336 for number 3.
And the feedback by the neuro computer 43 is repeatedly executed, and the exposure voltage value V stored in the exposure voltage storage unit 34 constituting the voltage control means is stored.
The charging voltage value Vg stored in c and the charging voltage storage unit 37 is corrected.

From the control device 40 to the concentration relation generating device 3
One cycle ends when the group number input to 8 is 0 to 3. If the sum of squares of the difference between O3 and Dti obtained during this one cycle period, that is, if the value of r shown in the following equation 9 is below a certain value, the correction of the control voltage values Vc, Vg is completed ( Steps S42 to S43), if r is equal to or greater than a certain value, the above cycle is executed again (Step S4).
2 to step S1). In equation 9, O3 (k) and Dti (k)
Represent O3 and Dti for the number k, respectively.

[0065]

[Equation 9] When the exposure voltage value, the charging voltage value, and the document density are given to the input layer 44, the neurocomputer 43 shows the characteristics of the toner density with respect to the document density and the control voltage value of the actual image forming system of this embodiment, and outputs the output layer with the characteristics. 46 so that it will be output from
Its internal coupling has been determined. Therefore, if the exposure voltage value Vc and the charging voltage value Vg obtained after the end of the above cycle are used for copying, the density relationship generator 38
Can be copied with characteristics very close to the relationship between the document density and the toner density stored in the ROM 39. Then, as described above, the relationship between the document density and the toner density stored in the ROM 39 of the density relationship generator 38 is set to an ideal relationship for obtaining good image quality. Therefore, according to the first embodiment, when the exposure voltage value Vc and the charging voltage value Vg deviate from the values at which the ideal image quality characteristics are obtained, the exposure voltage is fed back by the neurocomputer 43. The value Vc and the charging voltage value Vg are corrected and can be set to the exposure voltage value Vc and the charging voltage value Vg for copying with good image quality.

FIG. 5 shows the case where the exposure voltage value value stored in the exposure voltage storage section 34 and the charging voltage value stored in the charging voltage storage section 37 are once set to random values in the first embodiment. Image quality reproduction characteristics (characteristics for generating a toner image from a document) and the above voltage value are determined by the procedure shown in FIG.
The image quality reproduction characteristics by the optimum voltage values (exposure voltage value Vc and charging voltage value Vg) after correction are shown. As shown in FIG. 5, according to the first embodiment, it is possible to obtain the image quality reproduction characteristics that are substantially the same as the ideal image reproduction characteristics. Therefore,
It can be seen that the first embodiment described above is very effective in automatically determining the control voltage value of the image forming system.

FIG. 6 shows the configuration of a second embodiment which is an embodiment of the image forming control apparatus according to the second aspect of the present invention.

In this embodiment, the same parts as those in the first embodiment shown in FIG. 1 are designated by the same reference numerals, and the parts different from the first embodiment will be mainly described.

As shown in FIG. 6, in the second embodiment, the switch SW-1 is provided on the input side of the exposure voltage control unit 63, and the exposure voltage storage unit 34 is connected to the input of the exposure voltage control unit 63.
Alternatively, the toner voltage measuring lamp voltage generator 47 can be selected and connected.

A switch SW-2 is provided on the input side of the charging voltage control unit 66, and the charging voltage storage unit 37 or the toner concentration measuring charging voltage generation unit 48 is selected and connected to the input of the charging voltage control unit 66. You can do it.

When measuring the toner density, the light from the exposure lamp 6 is reflected by the reference original 49, and the reflected light is incident on the photoconductor 11. Then, as shown in FIG.
The toner concentration sensor 52, which is a reflection type optical sensor in which the light emitting unit 50 and the light receiving unit 51 are integrated, is the photosensitive member 1 described above.
1 is arranged so that the density of the toner adhering to the toner can be measured. The output of the density sensor 52 is A / D.
It can be connected to the output layer 76 of the neuro computer 73 through the converter 53 via the switch 56.

Switches 56, 56, 56, 56 are provided in each unit of the input layer 74 and the output layer 76.
The switch 56 is used when changing the internal coupling amounts 54 and 55 of the neuro computer 73.

By switching the switch 56, the reference original 4
A signal 57 obtained by converting the density value of 9 by a signal converter (not shown).
Alternatively, one of the document density values 58 generated by the density relationship generating device 38 can be selected and input to the input unit 74-1.

Further, by switching the switch 56, either the output value of the toner concentration measuring lamp voltage generating section 47 or the output value of the exposure voltage storing section 34 inputted to the exposure voltage control section 63 is selected to input unit. You can input to 74-2.

By switching the switch 56, either the output value of the charging voltage generator 48 for toner concentration measurement or the output value of the charging voltage memory 37, which is input to the charging voltage controller 66, is selected and the input unit is selected. You can input to 74-3.

Further, by switching the switch 56, the A / D conversion value 59 of the toner density or the density relation generating device 38
Of the toner concentration output value 60 of the output layer 7
6 can be input.

The reference original 49 is an original having four kinds of uniform densities. The reference original 49 is used only when measuring the toner density.

The reference original 49 is provided on the back side of the original table to save the trouble of placing it on the exposure position 5 of the original table and to prevent stains. The density of light exposed by the controller 70 is switched. Those that are designed to be used are good.

In the second embodiment, as the reference original 49, as shown in FIG. 7B, the density Do = 0.40, 0.4.
The disk on which the original 49 having the respective densities of 60, 0.90, and 1.20 was pasted was used so that it could be rotated by 90 ° by the step motor 61 in response to a command from the control device 70.

In the second embodiment, when the toner density is measured, several kinds of exposure voltages and charging voltages preset in the measuring lamp voltage generating section 47 and the measuring charging voltage generating section 48 are switched by the switch SW-. 1 through the switch SW-2, the exposure voltage control unit 63, and the charging voltage control unit 66 in this order, and is input to the exposure lamp regulator 32 and the high-voltage power supply 35, and the exposure lamp 6 and the charger 10 are driven to drive the reference original. A toner image of 49 is formed on the photoconductor 11.

Usually, the photoconductor 11 has a color such as reddish brown, and the color of the toner is black. Therefore, as the toner adheres to the photoconductor 11, the amount of light reflected by the light receiving portion 51 of the toner concentration sensor 52 decreases and the output voltage of the toner concentration sensor 52 increases. The output voltage from the toner concentration sensor 52 is converted by the A / D converter 53 into a digital signal indicating the output voltage value of the toner concentration sensor 52.

Next, the procedure for changing the internal connection of the neuro computer 73 of the second embodiment will be described with reference to FIGS.
It will be described according to the flowchart shown in FIG.

First, the input side of the exposure voltage controller 63 is connected to the toner concentration measuring lamp voltage generator 47 (step S44), and the charging voltage controller 66 is connected to the toner concentration measuring charging voltage generator 48 ( Step S45).

Next, for the toner image density measurement, the image forming conditions of the density, exposure voltage, and charging voltage of the reference original 49 are set to any one of the values shown in FIG. 8 depending on the values of m, n, and p. Is set (step S46 to step S51). Then, the toner image of the reference original 49 is formed on the photoconductor 11 under the set image forming conditions (step S52), and the toner image density value of the toner image is measured by the toner density sensor 52.

The A / D converted toner image density value is temporarily stored in a memory (not shown) addressed by the values of m, n and p (step S53). And m, n, p
4 ³ = 64 obtained by changing each value of 1 to 4
Under the same image forming conditions, the toner image density value Dt is measured and stored in the memory (steps S46 to S59).

As the image forming conditions for the toner image, as shown in FIG. 8, the exposure voltage is about 10V in steps from 50V to 80V, and the charging voltage is about 100V in steps from 400V to 700V. Up to

Next, the reference document density when image formation is performed on each input unit 74-1, 74-2, 74-3 of the neuro computer 73 under the image formation conditions set by the values of m, n and p described above. , The exposure voltage and the charging voltage are input respectively, and the input units 74-1, 74-2 and 74-3 output the reference document density, the exposure voltage and the charging voltage as the output values O11, O12 and O13, respectively. . (Steps S64 to S66).

Next, the neuro computer 73
The calculation based on the equations 2 and 4 from the input to the output described in the embodiment is performed, and the value depending on the strength of the internal coupling at the present time is output to the output layer 76 (steps S67 to S).
81).

By the way, in the above-described first embodiment, the error (correction amount) eli, e2i, e3 of each layer of the input layer, the intermediate layer, and the output layer and the correction amount dVi of the control voltage value are the calculated value O2 of the neurocomputer and It was calculated from the difference between O3 and the toner image density value output by the density relationship generator 38. On the other hand, in this second embodiment, the same calculation formula as in the first embodiment is used.
From the difference between the measured toner image density Dt and the output value O3 of the neurocomputer 73, the error (correction amount) e of the intermediate layer is calculated by using the following formulas 10 and 11 which are (formula 6 and formula 5).
The error (correction amount) e3 of 2j and the output layer 76 is calculated.
(Step S84, step S82).

[0090]

[Equation 10]

[0091]

[Equation 11] Furthermore, the correction amount dW2j of the coupling amount W2j between the jth unit of the intermediate layer 75 and the output layer 76 is calculated from the correction amount e3 of the output layer using the following formula 12 (step S8).
8).

[0092]

[Equation 12] In Expression 12, ε2 is a small value, and in this second embodiment, ε = 0.2.

The threshold value W20 of the output layer 76 is also corrected and calculated for j = 0, 1, ..., 10 (steps S87 to S91).

Further, for the coupling amount W1ij between the i-th unit of the input layer 74 and the j-th unit of the intermediate layer 75, the correction amount dW1ij is calculated using the following equation 13 (steps S92 to S92). S94).

[0095]

[Equation 13] The threshold value W10j of each unit in the intermediate layer 75 is also corrected and calculated for i = 0, 1, 2, and 3.

Further, the coupling amount W2j between the jth unit of the intermediate layer 75 and the output layer 76 is the correction amount dW obtained by the equation 12.
Using 2j, it is calculated by the following equation 14 and corrected (step S89).

[0097]

[Equation 14] Further, the coupling amount W1ij between the i-th unit of the input layer 74 and the j-th unit of the intermediate layer 75 is calculated and corrected by the following formula 15 using the correction amount dW1ij calculated by the formula 13 ( Step S95).

[0098]

[Equation 15] In Equations 14 and 15, the binding amount W2j (t) and the binding amount W1
ij (t) indicates the coupling amount W2j and the coupling amount W1ij in the t-th calculation cycle, respectively, and the coupling amount W2j (t + 1)
And W1ij (t + 1) represent the coupling amounts W2j and W1ij in the (t + 1) th calculation cycle, respectively.

The toner density of the toner image formed on the photoconductor 11 is measured for all combinations of the reference document density, the exposure voltage, and the charging voltage.

When the toner image is measured under the combination conditions of k sets of the reference original density, the exposure voltage and the charging voltage, k output values O3m of the neuro computer 73 are obtained.
The sum of squares of the difference between (m = 1,2 ..., k) and the actually measured k toner image densities Dtm (m = 1,2, ..., k), that is, The above-mentioned prescription (correction of the internal connection state of the neuro computer 73) is repeated until the value calculated by the equation (16) becomes equal to or less than a certain value that causes no practical problem (step S1).
07).

[0101]

[Equation 16] In this way, the neurocomputer 73 determines the characteristics of the image forming process of the copying machine of this embodiment, that is, the relationship between the document density and the exposure voltage and the charging voltage, that is, the relationship between the toner image density of the toner image formed by the image forming unit. Acquire as an inner join.

This process is usually called neurocomputer learning.

As described above, according to the second embodiment, the actually measured characteristics of the image forming process of the image forming system (original density, exposure voltage, charging voltage) are input to the neuro computer 73, so that Since the internal connection of the computer 73 is changed, the characteristics of the image forming process of the image forming system of the copying machine may change, or the characteristics of the image forming process of the image forming system may vary from machine to machine. Also, the characteristics of the image forming process of the image forming system are reflected in the internal connection of the neuro computer 73.

As described above, after the characteristics of the image forming process of the actual image forming system are reflected in the internal connection of the neuro computer 73, they are stored in the density relation generator 38 in the same manner as in the first embodiment. The ideal relationship of the toner image density with respect to the document density that has been recorded is expressed by
3 is input to the charging voltage V so that the ideal relationship between the toner image density and the document density can be realized.
It is possible to output g and the exposure voltage Vc from the units 74.3 and 74-2 of the input layer 74 of the neuro computer 73 and store them in the charging voltage storage unit 37 and the exposure voltage storage unit 34.

Further, according to the second embodiment, the neurocomputer 73 is made to learn the image forming characteristics of the copying machine of this embodiment at a suitable time so that the characteristics of the image forming process of the image forming system of the copying machine can be confirmed. The charging voltage Vg and the exposure voltage Vc that always realize the ideal relationship of the toner image density with respect to the document density by coping with changes over time and the characteristics of the image forming process of the image forming system depending on individual machines. Can be stored in the charging voltage storage unit 37 and the exposure voltage storage unit 34.

From the initial image forming characteristics shown by the solid line in FIG. 11, when the relationship between the exposure voltage and the image forming characteristics and the relationship between the charging voltage and the image forming characteristics simultaneously change from the initial image forming characteristics, The image forming characteristics corrected by the correction of the exposure voltage and the charging voltage according to the second embodiment are shown by a chain line, and
The image forming characteristics corrected by the correction of the exposure voltage and the charging voltage according to (Japanese Patent Publication No. 61-29502) are shown by the broken line. In the second embodiment described above, the concentration relationship generator 38 is similar to that shown in FIG.
The characteristic 26 shown in the characteristic diagram d is output.

As shown in FIG. 11, obviously, the conventional example
Compared with the image forming characteristic corrected by the Japanese Patent Publication No. 61-29502, the image forming characteristic corrected by the second embodiment has a better image forming characteristic closer to the initial image forming characteristic.

If the toner image density in the second embodiment is measured, for example, after the power is turned on and before the temperature of the fixing device reaches the specified temperature, the original copying operation is hindered. There is no inconvenience.

FIG. 12 shows the configuration of a third embodiment which is an embodiment of the image forming control apparatus according to the third aspect of the present invention.

In the third embodiment, parts common to the first embodiment shown in FIG. 1 and the second embodiment shown in FIG. 6 are designated by common reference numerals, and the first embodiment and the second embodiment shown in FIG. The part different from the second embodiment will be mainly described.

The third embodiment differs from the first embodiment in that
The density relation generator 38 is not provided. Further, the same reference document 49 as in the second embodiment is provided. Then, the density value of the reference original 49 is transferred to the unit 84-1 of the input layer 84 of the neurocomputer 83 via a signal converter (not shown).
It is connected to the. Further, the toner concentration sensor 52 similar to that of the second embodiment is connected to the output layer 86 of the neuro computer 83 via the A / D converter 53.

The neuro computer 83 is made to learn in advance the initial image forming characteristics of the image forming system of the copying machine of the third embodiment. That is, in the neuro computer 83,
The relationship of the toner density generated by the copying machine is learned with respect to each condition of the original density, the exposure voltage and the charging voltage given to the copying machine. Furthermore, unlike the second embodiment,
Internal connections 94 and 9 of the neurocomputer 83
5 is fixed. Based on the flowchart shown in FIG. 13, in the third embodiment, the exposure voltage value and the charging voltage value that can obtain a proper copy image quality are determined by the exposure voltage control unit 3.
3 and the exposure voltage storage unit 3 connected to the charging voltage control unit 36
4 and the procedure for setting the charging voltage storage unit 37 will be described.

Exposure voltage controller 33 and charging voltage controller 36
A toner image of the reference original 49 is formed on the photoconductor 11 based on the exposure voltage value and the charging voltage value input to and the density of the toner image is measured by the toner density sensor 52 (steps S112 and S113). ).

The density, exposure voltage value, and charging voltage value of the reference original 49 are input to the neuro computer 83 (steps S109 to S111), and the neuro computer 83 is fixed in the same procedure as in the first embodiment. The calculated value is output to the output layer 86 through the internal coupling (steps S114 to S128).

On the other hand, the toner image density measured by the toner density sensor 52 is given to the output layer 86, and the difference between the calculated value of the neurocomputer 86 and the actually measured toner image density is explained in the first embodiment. The procedure is fed back to the input layer 84 (steps S129 to S142).

In the above-described first embodiment, the density relation generator 3
While the output value of 8 is used as a reference value for feedback, the neurocomputer 8 is used in the third embodiment.
Since feedback must be performed with the output value O3 of 6 as the reference value, the sign when calculating e3 is opposite to that of the first embodiment. Then, the fed-back value is output from the input layer 84 as the corrected exposure voltage value and the corrected charging voltage value, and the exposure voltage storage unit 34.
And the charging voltage storage unit 37 (step S
143, step S144). Then, based on the corrected and stored exposure voltage value and charging voltage value, the above-described feedback is carried out for the portion of the reference original 49 having another density. Then, the above feedback processing is performed for a total of four reference densities (step S145, step S146, step S109).

In general, the initial image forming characteristics of the image forming system do not change rapidly, and even when there is a change, the shape itself of each characteristic curve shown in FIG. 16 maintains its original shape. Therefore,
If the correction amount is obtained by the procedure described above, a slight error will occur as compared with the second embodiment in which the internal coupling of the neurocomputer can be corrected according to the temporal change of the image forming characteristics, but the second embodiment
The exposure voltage value and the charging voltage value can be corrected with less processing than that in the embodiment.

FIG. 14 shows the initial image quality reproduction characteristics and the corrected image quality reproduction characteristics after copying 100 × 1000 sheets. It can be seen that good correction has been achieved by the above example.

In the above first to third embodiments, the embodiments applied to the copying machine have been described with reference to the drawings. However, the present invention is applied to electrophotographic printers, facsimiles, etc. in addition to the copying machine. It is possible.

[0120]

As is apparent from the above description, according to the invention described in claim 1, the control voltage value input to the image forming unit is
A neurocomputer trained in advance so that the relationship between the document density value and the toner image density value generated by the image forming unit corresponding to the document density value can be reproduced by the neurocomputer. The control voltage value corrected so as to approach the value is output to the input side, and the control voltage value stored in the voltage control means is corrected to the corrected control voltage value.

That is, under the regulation of the internal coupling of the neurocomputer, the stored value of the voltage control means is changed so that the output characteristic of the neurocomputer with respect to the document density input and the characteristic of the density relation generating means coincide with each other. .

Therefore, if the density relationship generating means is set so as to output the target image forming characteristic in the actual image forming system, the target image forming characteristic expressed by the internal coupling of the neuro computer is set as the target. The optimum control voltage value for realizing the image forming characteristic is set in the voltage control means.

Therefore, according to the first aspect of the present invention, the control voltage value can be corrected to a voltage value with which the optimum image quality can be obtained, regardless of the value stored in the voltage control means.
The image quality adjustment, which has been performed manually until now, can be performed automatically and quickly.

The invention described in claim 2 is the same as claim 1
Similarly to the invention described in (1), if the density relation generating means is set so as to output the target image forming characteristic in the actual image forming system, the image forming characteristic expressed by the internal coupling of the neuro computer is Then, the optimum control voltage value for realizing the target image forming characteristic is set in the voltage control means, and the neurocomputer uses the reference density value from the reference density output means and The control voltage value when the toner image is generated by the means and the toner image density value detected by the toner density detecting means are input to the input side and the input side. The internal coupling is changed so that the relationship between the reference density value, the control voltage value, and the toner image density value input to the output side can be reproduced.

That is, when the characteristics of the image forming system change,
The internal coupling of the neurocomputer can be changed according to the characteristic change, and the optimum control voltage value is always set in the voltage control means.

Therefore, according to the second aspect of the present invention, even if the characteristics of the image forming system change, or even if the characteristics of the image forming system are completely unknown, the optimum image forming system to be targeted is optimized. It is possible to automatically obtain the control voltage value for obtaining various image quality and only by the toner concentration detecting means (toner concentration sensor). In addition, the number of times a toner image is created to know the characteristics of the image forming system or to obtain the optimum control voltage value can be corrected only by combining predetermined image forming conditions. Therefore, the amount of toner consumed for this purpose can be kept relatively small.

According to the invention described in claim 3, the control voltage value input to the image forming section, the document density value, and the toner image density value generated by the image forming section corresponding to the document density value. The neurocomputer, which has been pre-learned so as to reproduce the relationship with, and has a fixed internal coupling, uses the reference density value of the reference original document means input to the input side from the reference density output means and the voltage control means. The control voltage value corrected so that the toner image density value calculated based on the control voltage value input to the side approaches the toner image density value of the reference document is output to the input side and stored by the voltage control means. The control voltage value being corrected is corrected to the corrected control voltage value described above.

Therefore, when the characteristic of the image forming system changes, the amount of feedback to the voltage control means changes according to the amount of change in the characteristic, and the optimum control voltage value is changed without changing the internal coupling of the neurocomputer. It is set in the voltage control means.

Therefore, according to the third aspect of the present invention, the characteristics of the image forming system are learned in advance, and the characteristic correction is performed by the neuro computer having a fixed internal coupling. The time for learning is unnecessary, and faster image forming characteristic correction processing is possible.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a schematic configuration of an image forming control apparatus according to a first embodiment of the invention of claim 1.

FIG. 2 is a configuration diagram of a concentration relationship generating device included in the first and second embodiments.

FIG. 3 is a diagram showing a combination of a document density value and a toner image density value stored in the density relationship generating device.

FIG. 4 is a flowchart showing an outline of a control procedure in the first embodiment.

FIG. 5 is a characteristic diagram of the image forming system according to the control voltage value obtained in the first embodiment.

FIG. 6 is a configuration diagram showing a schematic configuration of an image forming control apparatus according to a second embodiment of the invention of claim 2;

FIG. 7 is a diagram including a configuration diagram of a toner density sensor included in the second and third embodiments and a configuration diagram of a reference original document included in the second and third embodiments.

FIG. 8 is a diagram showing toner image forming conditions of the second embodiment.

FIG. 9 is a flowchart showing an outline of a control procedure of the second embodiment.

FIG. 10 is a flowchart showing an outline of a control procedure of the second embodiment.

FIG. 11 is a characteristic diagram of the image forming system according to the control voltage value obtained in the second embodiment.

FIG. 12 is a configuration diagram showing a schematic configuration of an image forming control device according to a third embodiment of the invention described in claim 3;

FIG. 13 is a flowchart showing an outline of a control procedure in the third embodiment.

FIG. 14 is a characteristic evaluation diagram of the image forming system based on the control voltage value obtained in the third embodiment.

FIG. 15 is a sectional view of a copying machine.

FIG. 16 is an explanatory diagram of image forming characteristics of an image forming system of a copying machine.

[Explanation of Codes] 1 Copier main body 5 Original exposure position 6 Exposure lamp 7 Copy original 8 Reflecting mirror 9 Lens 10 Charger 11 Photoconductor 13 Developing tank 14 Toner 15 Paper cassette 19 Fixing device 21 Initial exposure characteristic 22 Deterioration exposure characteristic 23 Initial photoconductor potential characteristics 24 Deteriorated photoconductor potential characteristics 25 Development characteristics 26 Initial image quality reproduction characteristics 27, 28, 31 Degraded image quality reproduction characteristics 29 Original bright area 30 Original dark area 33 Exposure voltage control section 34 Exposure voltage storage section 36 Charging voltage control section 37 Charging voltage storage unit 38 Concentration relation generating device 40 Control device 43 Neurocomputer 44 Input layer 45 Intermediate layer 46 Output layer 47 Toner concentration measuring lamp voltage generating unit 48 Toner concentration measuring charging voltage generating unit 52 Toner concentration sensor 53 A / D
Converter 54 Coupling of input layer and intermediate layer 55 Coupling of intermediate layer and output layer

Claims (3)

[Claims] 1. An image forming unit that creates a toner image density value corresponding to a document density value, a control voltage value that affects the toner image density created by the image forming unit are stored, and the control voltage value is stored. The voltage control means for outputting to the image forming unit, the reference document density value, and the reference toner image density value corresponding to the reference document density value are stored, and the reference document density value and the reference toner image density value are stored. The relationship between the density relationship generating means for outputting, the control voltage value input to the image forming section, the document density value, and the toner image density value generated by the image forming section corresponding to the document density value is shown. It is pre-learned so that it can be reproduced, has a fixed internal coupling, and has a reference original document density value input to the input side from the density relationship generating means and a control input to the input side from the voltage control means. Based on the voltage value, the above The toner image density value according to the partial combination is calculated, and from the output side based on the difference between the calculated toner image density value and the reference toner image density value input from the density relationship generating means to the output side. The control voltage value corrected by the feedback to the input side so that the calculated toner image density value approaches the reference density value is output to the input side, and the control voltage value stored in the voltage control means is corrected by the correction value. An image forming control apparatus comprising: a neuro computer that corrects the control voltage value. 2. An image forming unit that creates a toner image density value corresponding to a document density value, a control voltage value that affects the toner image density created by the image forming unit, and stores the control voltage value. The voltage control means for outputting to the image forming unit, the reference document density value, and the reference toner image density value corresponding to the reference document density value are stored, and the reference document density value and the reference toner image density value are stored. A density relation generating means for outputting, a reference manuscript means, a reference density output means for detecting a reference density of the reference manuscript means and outputting a reference density value of the reference manuscript means, and a control output by the voltage control means. Toner density detecting means for detecting the toner image density value of the toner image of the reference original document means generated on the basis of the voltage value, the reference density value from the reference density output means, and the image forming section for the reference original document means. of The control voltage value at the time of generating the toner image is input to the input side, and the toner image density value detected by the toner density detecting means is input to the output side. The internal coupling is changed so that the relationship between the reference density value, the control voltage value and the toner image density value input to the output side can be reproduced, while the reference document input to the input side from the density relationship generating means is changed. Based on the density value and the control voltage value input from the voltage control means to the input side, the toner image density value according to the internal coupling is calculated, and the calculated toner image density value and the density relationship are generated. Based on the difference from the reference toner image density value input from the means to the output side, feedback is performed from the output side to the input side, and the calculated toner image density value is corrected so as to approach the reference density value. And outputs a pressure value on the input side, the image formation control apparatus, characterized in that said voltage control means is a control voltage value stored, and a neuro-computer to correct the above corrected control voltage value. 3. An image forming unit that creates a toner image density value corresponding to a document density value, a control voltage value that affects the toner image density created by the image forming unit, and stores the control voltage value. The voltage control means for outputting to the image forming section, the reference manuscript means, the reference density output means for detecting the reference density of the reference manuscript means and outputting the reference density value of the reference manuscript means, and the voltage control means. Toner density detecting means for detecting a toner image density value of the toner image of the reference original generated by the image forming section based on the output control voltage value; a control voltage value input to the image forming section; Preliminarily learned so as to reproduce the relationship between the document density value and the toner image density value generated by the image forming unit corresponding to the document density value, having a fixed internal coupling, and outputting the reference density output. Input from the means to the input side A toner image density value according to the internal coupling is calculated based on the reference density value of the semi-original means and the control voltage value input to the input side from the voltage control means, and the calculated toner image density value is Based on the difference from the toner image density value of the reference original document means input to the output side from the toner density detecting means, feedback is performed from the output side to the input side, and the calculated toner image density value is the reference original document means. And a neuro computer for outputting the control voltage value corrected so as to approach the toner image density value to the input side and correcting the control voltage value stored in the voltage control means to the corrected control voltage value. An image forming control device characterized by the above.