JP2001331004A - Image forming device and its control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that the concentration of toner is not completely controlled and an insufficiently transferred image is formed in the case of controlling developing electric field and transfer electric field only by a temperature and humidity sensor because some toner takes a short time to attain humidity in accordance with the value of the temperature and humidity sensor or some toner takes a long time to attain it, though the temperature and humidity sensor comparatively rapidly follows up environmental change in the case of the sudden environmental change such as the change of temperature and humidity. SOLUTION: A 1st image forming condition is decided based on the detected temperature and humidity and a patch is formed according to the 1st image forming condition (102). The detected density of the patch and the density of the patch obtained from a table based on the detected temperature and humidity are compared (103), and the 1st image forming condition is corrected and a 2nd image forming condition is set in accordance with the compared result (103 to 106).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus and a control method thereof, and more particularly, to an image forming apparatus such as a copying machine, a printer, a facsimile machine, etc., for forming an image by an electrophotographic system.

[0002]

2. Description of the Related Art As one of image forming apparatuses, an electrophotographic copying apparatus is used.

As shown in FIG. 6, the copying apparatus includes a photosensitive drum (image carrier) 1 rotatably supported,
The photosensitive drum 1 is driven to rotate in a direction indicated by an arrow by a driving device (not shown).

Around the photosensitive drum 1, a primary charging device (charging means) 2 for charging the surface of the photosensitive drum 1 to a uniform potential, and exposing the surface of the photosensitive drum 1 to form an electrostatic latent image. An exposure device (exposure means) 3 for forming, a rotary developing device (developing means) 4 for developing the electrostatic latent image to form a toner image (visible image), and transferring the toner image onto a transfer material (described later) A transfer device 5 and a cleaning device (cleaning means) 6 for removing residual toner on the surface of the photosensitive drum 1 are provided.

The transfer apparatus 5 includes a transfer drum 50 rotatably supported.
Rotates in the direction of the arrow in the figure. As shown in FIG. 4, the transfer drum 50 has a cylindrical transfer substrate 501, on which a dielectric sheet 502 such as PET or PVDF is adhered. Then, on the surface of the transfer drum 50,
The transfer material P is electrostatically or mechanically held.

As shown in FIG. 6, a transfer charger 52 is disposed inside the transfer drum 50 so as to face the photosensitive drum 1 with the transfer drum 50 interposed therebetween. The transferred toner image is transferred onto the transfer material P. Also,
A pair of separation chargers 53 are provided inside and outside the transfer drum 50, and removes electricity from the transfer material P after the transfer. Further, a separation claw 56 is disposed at a position facing the surface of the transfer drum 50, and the transfer material P is separated from the transfer drum 50 by the leading end contacting the surface of the transfer drum 50 at the end of transfer. Further, a cleaning device 54 is provided so as to face the transfer drum 50, and cleans the surface of the transfer drum 50 after the transfer is completed.

The transfer material P separated from the transfer drum 50 passes through the fixing device 7 so that the toner image is fixed.

On the other hand, the rotary developing device 4 is, for example, a four-color toner such as a yellow toner, a magenta toner, a cyan toner, and a black toner (hereinafter, referred to as Y toner, M toner, C toner and BK toner, respectively). Four developing devices 4a, 4b, 4c and 4d for individually storing toner, and a substantially cylindrical developing device support 410 that holds these four developing devices 4a to 4d and is rotatably supported on the shaft. Consists of

The rotary developing device 4 conveys the desired developing devices 4a to 4d to a position facing the surface of the photosensitive drum 1 by rotating the developing device support 410 in the direction of the arrow in FIG. The electrostatic latent image is developed, and full-color development with four colors can be performed by one rotation of the developing device supporter 410.

The photosensitive drum 1 is provided with a photosensitive layer on a conductive substrate as an image carrier, and the exposure device 3 is composed of a light emitting element such as a laser or an LED.

In the image forming apparatus having the above configuration,
When the transfer material P is fed by a feeding device (not shown), the transfer material P is held while being wound around the surface of the transfer drum 50.

Then, the primary charging device 2 charges the surface of the rotating photosensitive drum 1 to a uniform potential, and the exposing device 3 performs a predetermined timing based on the image information of the first color (for example, yellow). Image exposure is performed to form a first color electrostatic latent image. At this time, the developing device 4a is transported to a position facing the surface of the photosensitive drum 1, and the electrostatic latent image on the surface of the photosensitive drum 1 is developed by the developing device 4a and is visualized.

The visualized toner image is transferred to a photosensitive drum
The transfer drum 50 rotates to a position facing the transfer drum 50 with the rotation of 1, and the transfer charger 50
The image is transferred to the upper transfer material P. On the other hand, the toner remaining on the surface of the photosensitive drum 1 is cleaned by the cleaning device 6, and the photosensitive drum 1 is ready for the next image formation.

When a second-color electrostatic latent image is formed on the surface of the photosensitive drum 1, the rotary developing device 4 is driven to rotate, and the developing device 4b is transported to a position facing the surface of the photosensitive drum 1. I have. Then, a second color toner image is formed on the surface of the photosensitive drum 1, and the second color toner image is transferred onto the surface of the transfer material P on which the first color toner image has already been transferred.

When the toner images of all colors are transferred to the surface of the transfer material P in this manner, a pair of separation chargers 53, 53
Are started, and the transfer material P is separated from the transfer charger 52. Then, the toner on the surface of the transfer material P is fixed by the fixing device 7, and the image formation is completed.

[0016]

Generally, an apparatus is often provided with a temperature / humidity sensor 900 for detecting the absolute moisture content in the apparatus. This is because different developing and transfer characteristics are corrected depending on the temperature and humidity, and a good image is formed under any environment. However, it is difficult to control to form a good image under any environment using the temperature and humidity sensor described above.

Before explaining the reason, for the sake of simplicity, the environmental conditions will be described in three sections based on the absolute moisture content obtained using information from the temperature and humidity sensor. For example, when the absolute moisture content obtained using the information from the temperature and humidity sensor is 0 or more and less than 10 g / kg,
The environment below 20 g / kg is referred to as “environment 2”, and the environment above 20 g / kg is referred to as “environment 3”. Here, the conditions for control in development and transfer performed in the environment 2 are standard.

It is known that under environment 1, the amount of water is small and the toner charge is large. Therefore, the adhesive force between the developing sleeve and the carrier is strong, and a high developing electric field is required. Further, since the adhesive force to the photoreceptor after development is strong, the transfer electric field needs to be high.

Conversely, it is known that under the environment 3, the water content is large and the toner charge is small. Therefore, the adhesive force to the developing sleeve is weak, and a low developing electric field is sufficient. Further, since the adhesion to the photoreceptor after development is weak, a low transfer electric field is sufficient. Therefore, the developing electric field and the transfer electric field are controlled to be higher in the environment 1 and lower in the environment 3 as compared to those electric fields in the environment 2. In FIG.
The physical quantities controlled according to each environment and their values are shown.

When an environmental change such as a sudden change in temperature and humidity occurs, the temperature and humidity sensor can follow up relatively quickly. However, depending on the type of toner, some toners reach the humidity corresponding to the value of the temperature and humidity sensor in a short time, and others require a long time. For this reason, in the control of the development electric field, the transfer electric field, and the like using only the temperature and humidity sensors, there is a problem that the density of each toner is not sufficiently controlled, and an image is insufficiently transferred.

An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to realize an image formation in which the influence of moisture contained in a toner is reduced.

[0022]

The present invention has the following configuration as one means for achieving the above object.

An image forming apparatus according to the present invention includes a forming unit for forming a toner image based on image data, a density detecting unit for detecting a density of the formed toner image, and a temperature and humidity at a predetermined position of the apparatus. Temperature and humidity detecting means, and control means for controlling image forming conditions of the forming means based on the detection results of the density detecting means and the temperature and humidity detecting means, wherein the controlling means is based on the detected temperature and humidity. A table showing the relationship between the temperature and humidity and the density of the toner image based on the detected density of the toner image and the detected temperature and humidity, based on the first image forming condition to be set, and causing the forming unit to form a toner image. The first image forming condition is corrected and the second image forming condition is set according to the result of the comparison.

A forming unit for forming a toner image based on the image data; a density detecting unit for detecting the density of the formed toner image; a temperature and humidity detecting unit for detecting a temperature and humidity at a predetermined position of the apparatus; Control means for controlling image forming conditions of the forming means based on a detection result of the density detecting means and the temperature and humidity detecting means, wherein the control means determines a water content of the toner based on the detected temperature and humidity. Forming a toner image on the forming unit based on a first image forming condition set based on the water content of the toner, detecting the density of the toner image, and detecting the toner water content and the toner content based on the toner water content. Comparing the density of the toner image obtained from the table showing the relationship with the density of the image, and correcting the first image forming condition and the second image forming condition according to the comparison result. And setting.

A method for controlling an image forming apparatus according to the present invention includes a forming section for forming a toner image based on image data, a density detecting section for detecting the density of the formed toner image, and a temperature and humidity at a predetermined position of the apparatus. A control method for controlling image forming conditions of the forming unit based on detection results of the density detecting unit and the temperature and humidity detecting unit, wherein the temperature detecting unit detects a temperature to be detected. A first image forming condition is determined based on the humidity, a toner image is formed in the forming unit according to the first image forming condition, a density of the detected toner image, and a temperature and humidity based on the detected temperature and humidity. The density of the toner image is compared with the density of the toner image obtained from the table indicating the relationship with the density of the toner image. Based on the comparison result, the first image forming condition is corrected and the second image forming condition is changed. Characterized in that it constant.

The image forming apparatus further includes a forming section for forming a toner image based on image data, a density detecting section for detecting the density of the formed toner image, and a temperature and humidity detecting section for detecting temperature and humidity at a predetermined position of the apparatus. In the image forming apparatus, a control method of controlling image forming conditions of the forming unit based on detection results of the density detecting unit and the temperature and humidity detecting unit, wherein the amount of toner water is determined based on the detected temperature and humidity. Determining the toner image on the basis of the first image forming condition set from the moisture content of the toner, and forming the toner image on the toner based on the density of the toner image detected and the moisture content of the toner. And the density of the toner image obtained from the table showing the relationship between the density of the toner image and the density of the toner image. And sets the image forming conditions.

[0027]

Embodiments of the present invention will be described below with reference to the drawings.

[0028]

First Embodiment An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 2, the recording apparatus according to the first embodiment of the present invention includes a photosensitive drum (image carrier) 1 rotatably supported, and the photosensitive drum 1 is not shown. It is rotationally driven in the direction of the arrow by the driving device.

Around the photosensitive drum 1, a primary charging device (charging means) 2 for charging the surface of the photosensitive drum 1 to a uniform potential, and the surface of the photosensitive drum 1 are exposed to form an electrostatic latent image. An exposure device (exposure means) 3 for forming, a rotary developing device (developing means) 4 for developing the electrostatic latent image to form a toner image (visible image), and transferring the toner image onto a transfer material (described later) A transfer device 5 and a cleaning device (cleaning means) 6 for removing residual toner on the surface of the photosensitive drum 1 are provided.

The transfer device 5 includes a transfer drum 50 rotatably supported.
Rotates in the direction of the arrow in the figure. The transfer drum 50 is shown in FIG.
As shown in FIG. 5, a transfer substrate 501 has a cylindrical shape, and a dielectric sheet 502 such as PET or PVDF is adhered on the transfer substrate 501. The transfer material P is electrostatically or mechanically held on the surface of the transfer drum 50.

As shown in FIG. 2, a transfer charger 52 is provided inside the transfer drum 50 so as to face the photosensitive drum 1 with the transfer drum 50 interposed therebetween, and is formed on the photosensitive drum 1. The toner image is transferred onto the transfer material P. Further, a pair of separation chargers 53 are provided inside and outside the transfer drum 50, and removes the charge of the transfer material P after the transfer. Further, a separation claw 56 is provided at a position facing the surface of the transfer drum 50,
At the end of the transfer, the transfer material P is separated from the transfer drum 50 by its leading end contacting the surface of the transfer drum 50. Further, a cleaning device 54 is provided so as to face the transfer drum 50, and cleans the surface of the transfer drum 50 after the transfer is completed.

Then, the transfer material P separated from the transfer drum 50 passes through the fixing device 7 and the toner image is fixed.

On the other hand, the rotary developing device 4 is provided with four color toners of, for example, yellow toner, magenta toner, cyan toner, and black toner (hereinafter, referred to as Y toner, M toner, C toner and BK toner, respectively). Four developing devices 4a, 4b, 4C, 4 for individually storing toner, and a substantially cylindrical developing device support rotatably supported while holding these four developing devices 4a to 4d. Consists of 410.

The rotary developing device 4 includes a developing device support 410
By rotating in the direction of the arrow in the drawing, desired developing units 4a to 4d
Is transported to a position facing the surface of the photosensitive drum 1, and the electrostatic latent image on the surface of the photosensitive drum 1 is developed, so that the developing device support 410 rotates once so that so-called four-color full-color development can be performed. It is configured.

The photosensitive drum 1 is provided with a photosensitive layer on a conductive substrate as an image carrier, and the exposure device 3 is composed of a light emitting element such as a laser or an LED.

In the image forming apparatus having the above configuration,
When the transfer material P is fed by a feeding device (not shown), the transfer material P is held while being wound around the surface of the transfer drum 50.

Then, the primary charging device 2 charges the surface of the rotating photosensitive drum 1 to a uniform potential, and the exposing device 3 performs a predetermined timing based on the image information of the first color (for example, yellow). The image fog light is applied to form a first color electrostatic latent image. At this time, the developing device 4a is transported to a position facing the surface of the photosensitive drum 1, and the electrostatic latent image on the surface of the photosensitive drum 1 is developed by the developing device 4a and is visualized.

The visualized toner image is transferred to a photosensitive drum
The transfer drum 50 rotates to a position facing the transfer drum 50 with the rotation of 1, and the transfer charger 50
The image is transferred to the upper transfer material P. On the other hand, the toner remaining on the surface of the photosensitive drum 1 is cleaned by the cleaning device 6, and the photosensitive drum 1 is ready for the next image formation.

When a second-color electrostatic latent image is formed on the surface of the photosensitive drum 1, the rotary developing device 4 is driven to rotate, and the developing device 4b is transported to a position facing the surface of the photosensitive drum 1. I have. Then, a second color toner image is formed on the surface of the photosensitive drum 1, and the second color toner image is transferred onto the surface of the transfer material P on which the first color toner image has already been transferred.

When the toner images of all colors are transferred to the surface of the transfer material P in this manner, the separation chargers 53 and 53 are activated, and the transfer material P is separated from the transfer charger 52. Then, the toner on the surface of the transfer material P is fixed by the fixing device 7, and the image formation is completed.

Further, a temperature / humidity sensor 900 is provided, and is controlled so as to obtain optimum developing conditions and transfer conditions in accordance with the amount of water in the apparatus. The following control conditions are usually used.

When the water content is 0 to less than 10 g / kg (environment 1), the development contrast is 300 V, the transfer current is 20 μA, and the water content is 10 to 2
Below 0 g / kg (environment 2), development contrast = 250 V, transfer current = 15 μA, and when water content is 20 g / kg or more (environment 3), development contrast = 200 V, transfer current = 10 μA.
Shown in

Here, in order to solve the above-mentioned problem, the image forming apparatus according to the present embodiment has the above-described temperature and humidity sensor 90.
In addition to 0, the image forming apparatus uses a density sensor 9 for detecting the density of the toner image on the photoconductor, and controls the following image forming conditions when a change in the environmental classification by the temperature / humidity sensor occurs. . FIG. 1 shows the flow of this control process.

In step 101, it is determined based on information from the temperature and humidity sensor 900 whether or not a change has occurred in the determined environmental category. If it is determined that no change has occurred, the process ends in step 107 assuming that the image forming conditions have not been changed.

If it is determined in step 101 that a change has occurred, the process proceeds to step 102, where a patch having a predetermined density is formed under the development and transfer conditions specified by the environment category, and the density of the patch is changed to the density. Read with sensor 9.

After reading in step 102, step 103
Then, it is determined whether or not the value of the patch density is within a normal reference density range previously obtained under the environment. For example, in the case of the environment 1, it is determined whether or not the density is within the range of the patch normally obtained with the moisture amount specified for the environment 1.

If it is determined in step 103 that the value of the patch density is within the reference density range, the process is terminated in step S104 assuming that the image forming conditions are not changed.

If it is determined in step 103 that the patch density is higher than the reference density range, the process proceeds to step 105, where it is determined that the toner has a higher moisture content than the environmental classification determined by the information from the temperature / humidity sensor 900, and image formation is performed. The condition is switched to the image forming condition when the water content is high.

If it is determined in step 103 that the patch density is lower than the reference density range, the process proceeds to step 106, where it is determined that the toner has a lower moisture content than the environmental classification determined by the information from the temperature / humidity sensor 900, and image formation is performed. The condition is switched to the image forming condition when the water content is low.

By these processes, the control of the image forming conditions is completed.

As described above, since the conditions for image formation are such that a patch is formed, its density is detected, and the water concentration of the toner is determined based on the value, the conditions for image formation are set directly from the patch. As a result, the detection error of the water content in the toner can be reduced, and the above-described problem can be solved.

The present invention is not limited to the embodiments described above, and a configuration obtained by combining them is also possible.

[0054]

[Second Embodiment] A second embodiment of the present invention is an application of the first embodiment to a copying apparatus. Therefore, the description of the same parts as in the first embodiment will be omitted.

In the copying apparatus according to the present embodiment, a reader of the copying apparatus is used without using the density sensor. With this, as described below, the same effect as the control according to the first embodiment can be obtained.

When a change in the environmental classification by the temperature and humidity sensor occurs, the following image forming conditions are controlled. FIG. 5 shows the flow of this control process.

In step 501, it is determined based on the information from the temperature / humidity sensor 900 whether or not the determined environmental category has changed. If it is determined that no change has occurred, the process ends in step 505 assuming that the image forming conditions have not been changed.

If it is determined in step 501 that a change has occurred, the flow advances to step 502 to display a message on an operation unit (not shown) to output a user test pattern.

Next, in step 503, a message is displayed to scan the output test pattern with a reader (not shown) in accordance with the displayed message, and the density of the scanned test pattern is read in accordance with the displayed message.

After reading in step 503, step 504
Then, it is determined whether or not the density of the test pattern is within a normal reference density range previously obtained under the environment. For example, in the case of the environment 1, it is determined whether or not the density is within the range of the density of the test pattern normally obtained with the moisture amount designated for the environment 1.

If it is determined in step 504 that the density value of the test pattern is within the reference density range, the processing is terminated in step 505 without any change in image forming conditions.

If it is determined in step 504 that the density of the test pattern is higher than the reference density range, the process proceeds to step 506, where it is determined that the toner has a higher moisture content than the environmental classification determined by the information from the temperature and humidity sensor 900. The image forming conditions are switched to the conditions when the amount of water is large.

If it is determined in step 103 that the test pattern density is lower than the reference density range, the process proceeds to step 106, where it is determined that the toner has less water content than the environmental classification determined by the information from the temperature and humidity sensor 900, and The forming condition is switched to the image forming condition when the water content is low.

With these processes, control of the image forming conditions is completed.

As described above, in the copying apparatus, the conditions for forming an image are output as a test pattern, the density is detected by scanning, and the water density of the toner is determined based on the value. Instead, it is possible to set the conditions for image formation, it is possible to reduce the detection error of the water content in the toner, and it is possible to obtain the same effect as that obtained in the first embodiment.

Note that the present invention is not limited to the above-described embodiments, and a configuration obtained by combining these is also possible.

According to each of the above-described embodiments, the image carrier for carrying the image, the charging means for uniformly charging the image carrier,
Exposure means for forming an electrostatic image on the image carrier, developing means for developing the electrostatic latent image to form a toner image, and transferring the toner image formed on the image bearing member to a transfer material In an image forming apparatus having a transfer unit and a fixing unit that fixes a toner image transferred to a transfer material, an image forming condition is controlled by an environment detecting unit that detects an environmental condition and an environmental condition obtained by the environment detecting unit. And a density detecting means for detecting the density of the toner image formed at a predetermined location. The density of the toner image formed under predetermined image forming conditions obtained by the density detecting means is determined by the environment detecting means. By comparing the density of the toner image formed under the predetermined image forming condition assumed from the obtained environmental condition with the density of the toner image, and when there is a difference equal to or more than the predetermined value, the image forming condition is controlled (corrected). Proper image formation It is possible to set the matter from the toner image. Therefore, it is possible to reduce the problem that the concentration of the toner is excessive or insufficient and the transfer is not sufficient, which is caused by the control using only the temperature and humidity sensor because the moisture contained in the toner cannot be accurately detected.

[0068]

[Other Embodiments] Even if the present invention is applied to a system including a plurality of devices (for example, a host computer, an interface device, a reader, a printer, etc.), an apparatus (for example, a copying machine) Machine, facsimile machine, etc.).

Further, an object of the present invention is to supply a storage medium (or a recording medium) on which a program code of software for realizing the functions of the above-described embodiments is recorded to a system or an apparatus, and to provide a computer (a computer) of the system or the apparatus. It is needless to say that the present invention can also be achieved by a CPU or an MPU) reading and executing the program code stored in the storage medium. In this case, the program code itself read from the storage medium implements the functions of the above-described embodiment, and the storage medium storing the program code constitutes the present invention. Also,
When the computer executes the readout program code, not only the functions of the above-described embodiments are realized, but also the operating system (OS) running on the computer based on the instructions of the program code.
It goes without saying that a case where the functions of the above-described embodiments are implemented by performing some or all of the actual processing, and the processing performs the functions of the above-described embodiments.

Further, after the program code read from the storage medium is written into the memory provided in the function expansion card inserted into the computer or the function expansion unit connected to the computer, the program code is read based on the instruction of the program code. Needless to say, the CPU included in the function expansion card or the function expansion unit performs part or all of the actual processing, and the processing realizes the functions of the above-described embodiments.

When the present invention is applied to the storage medium, the storage medium stores program codes corresponding to the flowcharts described above.

[0072]

As described above, according to the present invention,
Image formation in which the influence of moisture contained in the toner is reduced can be realized.

[Brief description of the drawings]

FIG. 1 is a view showing a processing flow for controlling image forming conditions according to a first embodiment;

FIG. 2 is a diagram illustrating a schematic configuration of an image forming apparatus according to the first embodiment;

FIG. 3 is a diagram illustrating an example of an image forming condition.

FIG. 4 is a diagram illustrating a schematic configuration of a transfer drum.

FIG. 5 is a diagram showing a flow of processing for controlling image forming conditions according to the second embodiment;

FIG. 6 is a diagram illustrating a schematic configuration of an image forming apparatus.

FIG. 7 is a diagram illustrating a relationship among a water content, a toner charge, an adhesive force, and image forming conditions.

Claims (7)

[Claims] 1. A forming unit for forming a toner image based on image data, a density detecting unit for detecting a density of the formed toner image, a temperature and humidity detecting unit for detecting a temperature and humidity at a predetermined position of the apparatus, Control means for controlling image forming conditions of the forming means based on a detection result of the density detecting means and the temperature and humidity detecting means, wherein the control means sets the first image forming set based on the detected temperature and humidity. A toner image is formed by the forming means based on the conditions, and the density of the toner image is obtained from a table indicating the relationship between the temperature and humidity and the density of the toner image based on the detected temperature and humidity. Wherein the first image forming condition is corrected and the second image forming condition is set according to the comparison result. 2. A forming means for forming a toner image based on image data; a density detecting means for detecting the density of the formed toner image; a temperature and humidity detecting means for detecting a temperature and humidity at a predetermined position of the apparatus; Control means for controlling image forming conditions of the forming means based on a detection result of the density detecting means and the temperature and humidity detecting means, wherein the control means determines a water content of the toner based on the detected temperature and humidity. Forming a toner image on the forming unit based on a first image forming condition set based on the water content of the toner, detecting the density of the toner image, and detecting the toner water content and the toner content based on the toner water content. Compare with the density of the toner image obtained from the table showing the relationship with the density of the image,
An image forming apparatus, wherein the first image forming condition is corrected and the second image forming condition is set according to the comparison result. 3. The image forming apparatus according to claim 1, wherein the second image forming condition is a transfer condition when a toner image is transferred to a recording sheet on a transfer drum. apparatus. 4. An image comprising a forming section for forming a toner image based on image data, a density detecting section for detecting the density of the formed toner image, and a temperature and humidity detecting section for detecting temperature and humidity at a predetermined position of the apparatus. In the forming apparatus, a control method for controlling image forming conditions of the forming unit based on detection results of the density detecting unit and the temperature and humidity detecting unit, wherein a first image forming condition is set based on detected temperature and humidity. Determining, forming a toner image on the forming unit under the first image forming condition, and a table showing a relationship between the detected density of the toner image and the temperature / humidity and the density of the toner image based on the detected temperature / humidity. And controlling the first image forming condition and setting the second image forming condition according to the comparison result. 5. A device comprising: a forming unit for forming a toner image based on image data; a density detecting unit for detecting the density of the formed toner image; and a temperature and humidity detecting unit for detecting temperature and humidity at a predetermined position of the apparatus. In the image forming apparatus, based on the detection results of the density detection unit and the temperature and humidity detection unit,
A control method for controlling an image forming condition of the forming unit, wherein a water content of the toner is determined based on a detected temperature and humidity, and based on a first image forming condition set from the water content of the toner, A toner image is formed by the forming unit, and the detected toner image density is compared with the toner image density obtained from a table showing the relationship between the toner water content and the toner image density based on the toner water content. And a control method for correcting the first image forming condition and setting a second image forming condition according to a result of the comparison. 6. An image comprising a forming section for forming a toner image based on image data, a density detecting section for detecting the density of the formed toner image, and a temperature and humidity detecting section for detecting temperature and humidity at a predetermined position of the apparatus. In the forming apparatus, a recording medium recording a program code for controlling an image forming condition of the forming unit based on a detection result of the density detecting unit and the temperature and humidity detecting unit, wherein the program code is at least detected. A code of a step of determining a first image forming condition based on temperature and humidity, a code of a step of forming a toner image in the forming unit based on the first image forming condition, a density of a detected toner image, A code for a step of comparing the density of the toner image obtained from the table showing the relationship between the temperature and humidity and the density of the toner image based on the detected temperature and humidity; A code for correcting the first image forming condition and setting a second image forming condition in accordance with a result of the comparison. 7. An image comprising a forming section for forming a toner image based on image data, a density detecting section for detecting the density of the formed toner image, and a temperature and humidity detecting section for detecting temperature and humidity at a predetermined position of the apparatus. In the forming apparatus, a recording medium recording a program code for controlling an image forming condition of the forming unit based on a detection result of the density detecting unit and the temperature and humidity detecting unit, wherein the program code is at least detected. A code for determining the amount of water in the toner based on the temperature and humidity, and a code for causing the forming unit to form a toner image based on a first image forming condition set from the amount of water in the toner. Obtained from a table showing the relationship between the toner image density and the toner image density based on the toner image density based on the toner image density. And a code for a step of correcting the first image forming condition and setting a second image forming condition according to the result of the comparison. Recording medium.