JPH1184990A - Temperature controller for image carrier and image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming device capable of obtaining an excellent image by improving temperature control for an image carrier. SOLUTION: This device is provided with a heating means 28 heating the image carrier 11, a temperature detecting means 14 detecting the information correlative to the temperature of the image carrier 11, a control means 20 controlling the heating means 28 by comparing the detected value by the detection means 14 with a reference value and an environment sensor 80 measuring the circumstances of surrounding environment. The control means 20 changes the reference value based on the measured result by the sensor 80.

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 such as a copying machine, a printer, a facsimile, and the like using a photosensitive member, and a temperature control device for an image carrier.

[0002]

2. Description of the Related Art In a conventional image forming apparatus, a temperature control method for detecting information correlated with the temperature of a photoreceptor as an image carrier and controlling the temperature of the photoreceptor so that the detected value is constant is often used. Are known.

[0003]

However, as the speed of the image forming apparatus or the size of the image forming apparatus is reduced, the conventional method causes various problems due to an increase in temperature in the apparatus and causes a problem on the surface of the photoreceptor. In some cases, it is difficult to simultaneously prevent the occurrence of problems such as image defects due to adhesion of moisture, corona products, exhaust gas of a diazo type copying machine, and the like.

An object of the present invention is to provide a temperature control device for an image carrier and an image forming apparatus capable of improving the temperature control of the image carrier and obtaining a good image. .

[0005]

According to a first aspect of the present invention, there is provided a temperature control device for an image carrier, which includes a heating means for heating the image carrier, and a temperature control device for controlling the temperature of the image carrier. In an image carrier temperature control device having a temperature detecting means for detecting correlated information, and a control means for controlling the heating means by comparing a detected value of the temperature detecting means with a reference value, a condition of an ambient environment And the control means changes the reference value based on the measurement result of the environment sensor.

A second configuration of the image carrier temperature control apparatus for realizing the object of the invention according to the present application is a heating means for heating the image carrier, and detecting information correlated with the temperature of the image carrier. An image carrier temperature control device having a temperature detection unit and a control unit for controlling the heating unit so that a detection value of the temperature detection unit becomes a target value, includes an environment sensor for measuring a situation of an ambient environment. The control means changes the target value based on the measurement result of the environment sensor.

A third structure of the image carrier temperature control apparatus for realizing the object of the invention according to the present application is a heating means for heating the image carrier, and detecting information correlated to the temperature of the image carrier. Controlling the heating means by comparing a temperature detection means, an environment sensor for measuring a situation of an ambient environment, and a plurality of reference values detected by the temperature detection means with respect to a plurality of reference values which change uniquely according to a measurement result of the environment sensor. And control means.

According to a fourth configuration of the image carrier temperature control device for realizing the object of the invention according to the present application, in the third configuration described above, the control means is configured to control the measurement result of the environment sensor and a plurality of reference values. The relationship with the value is changed based on the measurement result of the ambient humidity.

According to a fifth aspect of the invention, there is provided a temperature control device for an image carrier, wherein the environment sensor detects at least a temperature of an environment around an image forming apparatus equipped with the image carrier. It is intended to be measured.

A sixth structure of the image carrier temperature control apparatus for realizing the object of the invention according to the present application is a heating means for heating the image carrier, and detecting information correlated to the temperature of the image carrier. A temperature control device for an image carrier, comprising: a temperature detection unit; and a control unit that controls the heating unit based on a comparison result between a detection value of the temperature detection unit and a reference value, wherein the control unit includes the image carrier The reference value is changed in accordance with an operation state including a process non-operation using.

According to a seventh aspect of the invention, there is provided a temperature control apparatus for an image carrier for realizing the object of the present invention, comprising a heating means for heating the image carrier, and detecting information correlated to the temperature of the image carrier. In a temperature control device of an image carrier having a temperature detection unit and a control unit that controls the heating unit such that a detection value of the temperature detection unit becomes a target value, the control unit includes:
The target value is changed according to an operation state including a process non-operation using the image carrier.

A first configuration of an image forming apparatus for realizing the object of the invention according to the present application has a temperature control device for an image carrier having any one of the above-described configurations.

A second configuration of the image forming apparatus for realizing the object of the invention according to the present application is the same as the above-described configuration of the image forming apparatus, except that the image forming apparatus includes a plurality of image carriers and is formed on the plurality of image carriers. The color images are formed by transferring the visible images of a plurality of colors onto a recording material.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In each of the embodiments of the present invention described below, the present invention is applied to an electrophotographic color copying machine having a plurality of drums, but the present invention is not limited to this. Machine or printer, facsimile,
It goes without saying that the present invention can be applied to image forming apparatuses other than the mono-color type and the electrophotographic type.

(First Embodiment) FIG. 1 is an external view showing a configuration example of a color copying machine according to the present embodiment.

An outline of a full-color image forming process will be described. The document placed on the document table 3 is read by the reader unit 1, converted into an image signal, subjected to desired processing, and sent to the printer unit 2. In the printer unit 2, the image signal is converted into a laser beam modulated by a laser driver 4. In FIG. 1, 5 is a polygon scanner which scans the laser beam,
The photosensitive drums 11 to 71 of the image forming units 10, 30, 50, and 70 of the respective colors are irradiated.

Reference numeral 10 denotes a yellow (Y) image forming unit;
Is a magenta (M) image forming unit, 50 is a cyan (C)
An image forming unit 70 is a black (Bk) image forming unit.
An image of each corresponding color is formed. Image forming unit 10
70 are substantially the same, the details of the Y image forming unit 10 will be described below, and the description of the other image forming units will be omitted. In the Y image forming unit 10, a photosensitive drum 11 forms an electrostatic latent image on the surface thereof by a laser beam from the polygon scanner 5. Reference numeral 12 denotes a primary charger, and the photosensitive drum 1
1 is charged to a predetermined potential to prepare for formation of an electrostatic latent image. A developing unit 15 develops the electrostatic latent image on the photosensitive drum 11 to form a toner image. Reference numeral 16 denotes a transfer blade, which discharges electricity from the back of the transfer belt 6 and
1 is transferred to a recording paper or the like on the transfer belt 6.

The photosensitive drum 11 after the transfer is the cleaner 1
7, the surface is cleaned, and the charge is removed by the auxiliary charger 18.
Further, the residual charge is erased by the pre-exposure lamp 19, and the primary charger 12 is again used to obtain good charge. Reference numeral 13 denotes a potential sensor which measures the surface potential of the photoreceptor 11, and based on the measurement result, controls the grid 12 of the primary charger 12 so that a desired surface potential and image density can be obtained.
1 (grid bias), the voltage (development bias) applied to the developing sleeve 151 of the developing device 15, and the like are controlled. An air duct (not shown) is attached to an upper portion of the primary charger 12, and outside air sucked by an intake fan (not shown) is introduced from the upper portion of the primary charger through the air duct, and the inside of the primary charger is And blows to the drum. The air flow exhausts corona products and the like in the primary charger, ventilates the inside of the machine, and cools the inside of the machine.

The recording paper or the like onto which the toner image has been transferred is conveyed by the transfer belt 6, and thereafter, the toner images of the respective colors formed by the respective image forming units are sequentially transferred in the order of M, C, and Bk. An image of four colors is formed on the surface. The recording paper or the like that has passed through the Bk image forming unit is separated from the transfer belt 6 after being discharged by a discharging charger 7 in order to facilitate separation from the transfer belt 6. The separated recording paper or the like is charged by a pre-fixing charger 8 and then a toner image is fixed by a fixing unit 9 in order to compensate for toner attraction and prevent image disturbance.

Reference numeral 80 denotes an environment measuring sensor that measures the temperature and humidity around the color copying machine and controls the copying process based on the measurement results.

FIG. 2 is a block diagram of a photosensitive drum, a temperature control circuit, and an environment measuring circuit according to the present embodiment.

The temperature control of the photosensitive drum 11 in the present embodiment will be described with reference to FIG. Reference numeral 14 denotes a temperature detecting thermistor, which is installed near the photosensitive drum 11. The resistance value of the thermistor 14 approximately corresponds to the temperature of the photosensitive drum 11. Thermistor 14
It is connected to a DC controller 20, and a detection circuit 21 in the DC controller inputs a divided voltage value (hereinafter, detected temperature) corresponding to the resistance value of the thermistor 14 to an AD converter 22 via a selector 25. AD converter 2
The detected temperature digitally converted by the CPU 2
Sent to

The photosensitive drum 11 includes a drum portion 110 in which a photosensitive layer or the like is coated on an aluminum base material, a front flange 111 and a rear flange 112 which are fitted in front and rear.
The photosensitive drum 11 is installed by passing the front and rear flanges through a drive shaft 27 of a copying machine main body, and is driven to rotate. A leaf spring 113 is provided on the rear flange, and the photosensitive drum 11 is grounded by contacting both the drum unit 110 and the drive shaft 27.

A heater 28 is provided in the drive shaft 27. When the heater 28 is energized, the photosensitive drum 11 is heated via the drive shaft 27 and the leaf spring 113.

A high temperature adjustment value and a low temperature adjustment value are stored in a RAM 24 attached to the CPU 23. When the detected temperature is lower than the low temperature adjustment value, the heater 28 is energized to reduce the drum temperature of the photosensitive drum 11. If the detected temperature is equal to or higher than the high temperature adjustment value, the temperature of the photosensitive drum 11 is decreased by not energizing the heater 28. Thus, the temperature of the photosensitive drum 11 can be controlled.

The ambient temperature and humidity detected by the environment sensor 80 are converted into voltage values,
5 to the AD converter 22. The ambient temperature and humidity digitally converted by the AD converter 22 are sent to the CPU 23 and stored in the RAM 24.

Next, the control target value of the drum temperature will be described below.

In an environment of relatively high humidity, the photosensitive drum 1
Due to the moisture adhering to the surface of the photosensitive drum 11, the surface resistance of the photosensitive drum 11 may be reduced, and the formed electrostatic latent image may flow along the photosensitive drum surface. As a result, the developed image may blur and become defective. In order to prevent such a phenomenon, it is necessary to heat the photosensitive drum and keep it at a high temperature with respect to the surrounding environment.

Further, even in a normal temperature and normal humidity environment, discharge products such as nitrogen oxides by the corona discharge in the primary charger 12 or ammonia in the exhaust gas of a diazo type copier installed near the drum. Adhere to the surface of the photosensitive drum 1 due to the influence of such an electrolyte.
In some cases, the surface resistance of the photosensitive drum 1 decreases, the charge of the electrostatic latent image flows, and an image defect occurs.

However, at the same time, it is necessary to prevent the temperature inside the apparatus from exceeding an allowable range. The toner used in the full-color copying machine of the present embodiment is made of a polyester resin containing a coloring material and the like. Such a toner softens as the temperature rises, and the toners stick together.

In the case of the present embodiment, if the temperature in the developing unit 15 exceeds 45 ° C., the toners tend to adhere to each other,
If the temperature exceeds 50 ° C., development failure clearly occurs.
In addition, the cleaning performance of the cleaning blade mounted on the cleaner 17 is also reduced due to the hardening of the blade rubber material due to the temperature rise.
May occur.

The control target temperature of the photosensitive drum 11 is set to a high humid environment in order to prevent both the image defect related to the adhesion of moisture as described above, the development defect related to the temperature rise, and the image defect caused by the cleaning defect. Below, it is set to 38 ° C.

In a low-humidity environment, since the above-mentioned problem is unlikely to occur, the control target temperature of the photosensitive drum 11 is set to 35 ° C. in order to further improve the developing property and the cleaning property.

In this embodiment, as described above, the temperature of the photosensitive drum 11 is controlled based on the temperature detected by the thermistor 14 installed near the photosensitive drum 11. The thermistor 14 is installed near the photosensitive drum but is separated therefrom. As a result, the temperature detected by the thermistor 14 is affected by the supplied outside air temperature, and
Temperature will be lower than the temperature.

In this embodiment, the photosensitive drum 1 described above is used.
In order to correct the difference between the temperature of No. 1 and the temperature detected by the thermistor 14 and control the temperature of the photosensitive drum 11 to an appropriate value,
The high temperature adjustment value and the low temperature adjustment value are changed and controlled according to the temperature and humidity around the copying machine main body.

FIG. 3 shows the change of the high temperature adjustment value and the low temperature adjustment value according to the ambient temperature and the humidity. As the ambient temperature increases, the difference between the temperature of the photosensitive drum 11 and the detected temperature of the thermistor 14 decreases, and accordingly, the high temperature adjustment value and the low temperature adjustment value are set low. Further, as described above, in order to increase the temperature regulation temperature under high humidity and lower the temperature regulation temperature under low humidity, the range of the ambient humidity is set to three regions. Control is performed by shifting the adjustment value and the low-temperature adjustment value.

The high temperature adjustment value and low temperature adjustment value corresponding to these ambient temperature and humidity regions are stored in the RAM 24 in advance.
Then, the CPU 23 sets a high temperature adjustment value and a low temperature adjustment value corresponding to the ambient temperature and the humidity detected by the environment sensor 80, and based on the high / low adjustment values, turns on / off the heater 28.
Turn off control.

FIG. 4 shows a change in the temperature of the photosensitive drum 11 corresponding to the ambient temperature and humidity of the copying machine main body in the present embodiment. As described above, the ambient temperature and humidity of the copying machine main body are detected, and the ON / OFF of the heater 28 is determined by using the corresponding high-temperature adjustment value and low-temperature adjustment value.
By performing the off control, it is possible to control the temperature of the photosensitive drum 11 within a range of ± 3 ° C., including the overshoot and the undershoot, which does not cause any practical problem around the target value. It became.

(Second Embodiment) The basic configuration of the present embodiment is similar to that of the image forming apparatus shown in FIG.
Except that 0 is not provided, the second embodiment is the same as the first embodiment, and only different points will be described.

In the block diagram shown in FIG.
The RAM in 3 stores a high temperature adjustment value and a low temperature adjustment value. When the detected temperature is equal to or lower than the low temperature adjustment value, the heater 28 is energized to increase the drum temperature of the photosensitive drum 11 to detect the detected temperature. Is higher than the high temperature adjustment value, the heater 28
, The temperature of the photosensitive drum 11 is lowered. Thus, the temperature of the photosensitive drum 11 can be controlled.

Next, the control target value of the drum temperature will be described below.

In an environment of relatively high humidity, the photosensitive drum 1
The surface resistance of the photosensitive drum 11 may be reduced due to the moisture attached to the surface of the photosensitive drum 11, and the formed electrostatic latent image may flow along the surface of the photosensitive drum. As a result, the developed image may blur and become defective. In order to prevent such a phenomenon, it is necessary to heat the photosensitive drum and keep it at a high temperature with respect to the surrounding environment.

Further, even under a normal temperature and normal humidity environment, discharge products such as nitrogen oxides by corona discharge in the primary charger 12 or ammonia in the exhaust gas of a diazo type copying machine installed in the vicinity. Adheres to the drum and becomes a nitric acid compound or the like. Under the influence of such an electrolyte, the photosensitive drum 11
In some cases, the surface resistance of the toner image decreases and the charge of the electrostatic latent image flows to cause image defects.

However, at the same time, it is necessary to prevent the temperature inside the apparatus from exceeding an allowable range. The toner used in the full-color copying machine of the present embodiment is made of a polyester resin containing a coloring material and the like. Such a toner softens as the temperature rises, and the toners stick together.

In the case of the present embodiment, if the temperature in the developing unit 15 exceeds 45 ° C., the toners tend to adhere to each other,
If the temperature exceeds 50 ° C., development failure clearly occurs.
In addition, the cleaning performance of the cleaning blade mounted on the cleaner 17 is also reduced due to the hardening of the blade rubber material due to the temperature rise.
May occur.

Therefore, in the present embodiment, the photosensitive drum 11 is used to prevent both image defects related to the adhesion of moisture as described above, and image defects due to development defects and cleaning defects related to temperature rise. Control target temperature of 38
Set to ° C.

In this embodiment, the temperature of the photosensitive drum 11 is controlled based on the temperature detected by the thermistor 14 installed near the photosensitive drum 11.

When the copying machine main power is off, the temperature detected by the thermistor 14 is substantially the same as the temperature of the photosensitive drum 11. However, during the copying process, other exhaust air, including the intake fan, and a cooling fan are operating, and the outside air is always supplied to the vicinity of the photosensitive drum.

As a result, the temperature detected by the thermistor 14 is
The temperature is lower than the temperature of the photosensitive drum 11 due to the influence of the supplied outside air. Even when the copying process is stopped, if the main power of the copying machine is turned on,
Since a plurality of fans are operating for the main purpose of suppressing the temperature rise of each part in the copying machine such as a power supply, although the intake fan is stopped, an air flow exists in the copying machine, and as a result,
The temperature detected by the thermistor 14 depends on whether the copying process is in progress or not.
To the extent that the photosensitive drum 1 is located between the main power off state and
The temperature will be lower than the temperature of 1.

In this embodiment, the photosensitive drum 1 described above is used.
In order to correct the difference between the temperature of No. 1 and the temperature detected by the thermistor 14 and control the temperature of the photosensitive drum 11 to an appropriate value,
Switching between the high temperature adjustment value and the low temperature adjustment value is controlled in accordance with the state of the copying machine main body.

More specifically, as shown in FIG. 6, the state of the copying machine body is as follows: the main power is off (off), and the main power is on, but the copying process is operating. No state (standby): The state where the copying process is operating (copy) is classified into three types, and the high temperature adjustment value and low temperature adjustment value are stored in the RAM for each state.

Then, the CPU 23 determines which of the above three states is in, and uses the high temperature adjustment value and the low temperature adjustment value corresponding to the state to perform the on / off control of the heater 28 as described above. carry out.

Table 1 shows the high temperature adjustment value and the low temperature adjustment value corresponding to the three types of states.

[0054]

[Table 1]

FIG. 6 shows a change in the temperature of the photosensitive drum 11 corresponding to the state of the copying machine main body in the present embodiment.

As described above, it is determined which of the three types of states of the copying machine main body are in, and the on / off of the heater 28 is determined by using the high temperature adjustment value and the low temperature adjustment value corresponding to the state. By performing the control, the temperature of the photosensitive drum 11 is controlled within the range of 38 ± 3 ° C. including the overshoot and the undershoot, which is a range where practically no problem occurs around the target value of 38 ° C. It became possible.

(Third Embodiment) The configuration and operation of the image forming apparatus of the present embodiment are the same as those of the first embodiment.

The photosensitive drum, the temperature control circuit, and the environment measuring circuit in the present embodiment are the same as those in FIG. Regarding the temperature control of the photosensitive drum 11 in the present embodiment, FIG.
This will be described with reference to FIG.

In the present embodiment, R in the CPU 23
The AM 24 stores a target value. When the detected temperature of the thermistor 14 becomes equal to or higher than the target value, the power supply to the heater 28 is turned off, and the temperature of the photosensitive drum 11 is reduced. When the detected temperature falls below the target value, the heater 28 is energized to increase the temperature of the photosensitive drum 11. Thereby, the temperature of the photosensitive drum 11 can be controlled to the target temperature.

The control target temperature of the photosensitive drum 11 is set to 38 ° C. in a high humidity environment, as in the first embodiment.

In a low-humidity environment, since the above-mentioned problem is unlikely to occur, the control target temperature of the photosensitive drum 11 is set to 35 ° C. in order to further improve the developing property and the cleaning property.

Also in this embodiment, in order to correct the difference between the above-described temperature of the photosensitive drum 11 and the temperature detected by the thermistor 14 and control the temperature of the photosensitive drum 11 to an appropriate value, the temperature around the copying machine main body is adjusted. The target value is changed and controlled according to the humidity and the humidity.

That is, as in the first embodiment, as the ambient temperature increases, the difference between the temperature of the photosensitive drum 11 and the temperature detected by the thermistor 14 decreases.
Accordingly, the target value is set lower.

Further, as described above, in order to raise the temperature control temperature under high humidity and lower the temperature control temperature under low humidity,
The range of the ambient humidity is set in three regions, and the target value is shifted and controlled in accordance with each region.

The target values corresponding to these ambient temperature and humidity regions are stored in the RAM 24 in advance. And CP
U23 sets a target value corresponding to the ambient temperature and humidity detected by the environment sensor 80, and performs on / off control of the heater 28 based on the target value.

As described above, by detecting the ambient temperature and humidity of the copying machine main body and performing on / off control of the heater 28 using the target values corresponding thereto,
As in the above-described embodiment, it is possible to control the temperature of the photosensitive drum 11 within a range of ± 3 ° C., including the overshoot and the undershoot, around the target value, which does not cause any practical problem. Was.

(Fourth Embodiment) The configuration and operation of the image forming apparatus according to the present embodiment are the same as those of the second embodiment.

The photosensitive drum and the temperature control circuit in this embodiment are the same as those in FIG. The temperature control of the photosensitive drum 11 in the present embodiment will be described with reference to FIG.

A target value is stored in the RAM in the CPU 23. When the detected temperature of the thermistor 14 becomes equal to or higher than the target value, the power supply to the heater 28 is turned off, and the temperature of the photosensitive drum 11 is reduced. Lower. When the detected temperature falls below the target value, the heater 28 is energized to increase the temperature of the photosensitive drum 11. Thereby, the temperature of the photosensitive drum 11 can be controlled to the target temperature.

The control target temperature of the photosensitive drum 11 is set at 38 ° C. as in the first embodiment.

Also in this embodiment, in order to correct the difference between the temperature of the photosensitive drum 11 and the temperature detected by the thermistor 14 and to control the temperature of the photosensitive drum 11 to an appropriate value, the state of the copying machine main body is changed. The target value is switched and controlled accordingly.

More specifically, the state of the copying machine main body is such that the main power is off (off), the main power is on, but the copying process is not operating (standby), and the copying process is stopped. 3 of operating status (copy)
The target values are stored in the RAM for each state. Then, the CPU 23
The state of the type is determined, and the on / off control of the heater 28 is performed as described above using the target value corresponding to the state.

Table 2 shows the target values corresponding to the three types of states.
Shown in

[0074]

[Table 2]

As described above, it is determined which of the three types of states of the copier main body are in, and the on / off control of the heater 28 is performed using the control target value corresponding to the state. As a result, the temperature of the photosensitive drum 11 including the overshoot and the undershoot in the range where no practical problem occurs around the target value of 38 ° C. as in the case of the second embodiment shown in FIG. It became possible to control within a certain range of 38 ± 3 ° C.

(Fifth Embodiment) FIG. 7 is a partially cutaway perspective view of a photosensitive drum when another photosensitive drum heater is used. The outline of a full-color image forming process is described in the first embodiment. This is the same as in the case of the form.

Reference numeral 28 is used in the present embodiment.
It is a sheet type drum heater. The heater 28 is of a type in which a heater (heating resistor) is printed on a base material, and is provided along the inner surface of the photosensitive drum 11.

Also in the present embodiment, the first,
As in the case of the third embodiment, the ambient temperature and humidity of the copying machine main body are detected, and the heater is adjusted by using the high and low temperature adjustment values corresponding thereto or by using the control target value. By performing the on / off control of 28, it is possible to control the temperature of the photosensitive drum 11 to a range that does not cause a practical problem, including the overshoot and the undershoot.

The fifth embodiment is applied to the second and fourth embodiments described above, and the main body of the copying machine is similar to the second and fourth embodiments. Is 3
By judging which type of state it is in, and performing on / off control of the heater 28 using a high temperature adjustment value and a low temperature adjustment value corresponding to the state, or using a control target value. In addition, it is possible to control the temperature of the photosensitive drum 11 to a range that does not cause a practical problem, including the amount of overshoot and undershoot.

In addition, the present invention can be applied regardless of the shape of the photosensitive drum heater.

(Sixth Embodiment) The first to fifth embodiments described above
Although the embodiment of the present invention has been described with reference to a four-drum type full-color copying machine, the present invention is not limited to this, and is not limited to other types of full-color copying machine, mono-color / multi-color copying machine, and electrophotography. The present invention can be applied to various image forming apparatuses irrespective of the system, including a copier or an image reading apparatus such as a scanner.

[0082]

According to the first to fifth and eighth and ninth aspects of the present invention, a reference value or a target value relating to a temperature control of a photosensitive member as an image carrier is correlated with a surrounding environment, for example, an image. Therefore, the temperature of the image carrier can be controlled within an appropriate temperature range, and a high-quality image can be provided.

According to the present invention, the reference value or the target value related to the temperature control of the photosensitive member as the image bearing member is changed according to the operation state including the non-operation of the image forming apparatus. By doing so, the temperature of the image carrier can be controlled within an appropriate temperature range, and a high-quality image can be provided.

[Brief description of the drawings]

FIG. 1 is an external view illustrating a configuration example of a color copying machine according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a photosensitive drum, a temperature control circuit, and an environment measurement circuit of the image forming apparatus shown in FIG.

FIG. 3 is a diagram illustrating a change in a high-temperature adjustment value and a low-temperature adjustment value according to the ambient temperature and the humidity of the image forming apparatus illustrated in FIG. 1;

FIG. 4 is a diagram illustrating a change in the temperature of the photosensitive drum corresponding to the ambient temperature and humidity of the image forming apparatus main body of FIG. 1;

FIG. 5 is a block diagram of a photosensitive drum and a temperature control circuit according to a second embodiment.

FIG. 6 is a diagram illustrating a change in temperature of a photosensitive drum corresponding to a state of a copying machine main body according to the second embodiment.

FIG. 7 is a perspective view showing a photosensitive drum according to a fifth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Leader part 2 Printer part 10, 30, 50, 70 Image formation part 11, 31, 51, 71 Photosensitive drum 12 Primary charger 14 Temperature detection thermistor 20 DC controller 21 Detection circuit 22 AD converter 23 CPU 24 RAM 110 Drum Part 28 heater 80 environment sensor

Claims (9)

[Claims] A heating unit that heats the image carrier; a temperature detection unit that detects information correlated with a temperature of the image carrier; and a heating unit that compares a detection value of the temperature detection unit with a reference value. A temperature control device for controlling the means, the temperature control device for the image carrier having an environment sensor for measuring a situation of an ambient environment, wherein the control means changes the reference value based on a measurement result of the environment sensor. A temperature control device for an image carrier, characterized in that: 2. A heating means for heating the image carrier, a temperature detecting means for detecting information correlated with a temperature of the image carrier, and the heating means so that a detected value of the temperature detecting means becomes a target value. A temperature control device for controlling the temperature of the image carrier, comprising: an environment sensor for measuring a situation of an ambient environment, wherein the control unit changes the target value based on a measurement result of the environment sensor. A temperature control device for an image carrier, characterized in that: 3. A heating unit for heating the image carrier, a temperature detecting unit for detecting information correlated with the temperature of the image carrier, an environment sensor for measuring a condition of the surrounding environment, and a measurement result of the environment sensor. And a control means for controlling the heating means by comparing the detected values of the temperature detection means with a plurality of reference values which are uniquely changed by the control means. 4. The method according to claim 3, wherein the control unit determines a relationship between the measurement result of the environment sensor and a plurality of reference values.
A temperature control device for an image carrier, wherein the temperature is changed based on a measurement result of an ambient humidity. 5. The image carrier according to claim 1, wherein the environment sensor measures at least a temperature of an environment around an image forming apparatus provided with the image carrier. Temperature control device. 6. A heating means for heating the image carrier, a temperature detecting means for detecting information correlated to the temperature of the image carrier, and a comparison between a detected value of the temperature detecting means and a reference value. In the image carrier temperature control device having a control unit for controlling the heating unit, the control unit changes the reference value according to an operation state including a process non-operation using the image carrier. Temperature control device for an image carrier. 7. A heating means for heating the image carrier, a temperature detecting means for detecting information correlated with a temperature of the image carrier, and the heating means so that a detected value of the temperature detecting means becomes a target value. An image carrier temperature control device having control means for controlling the temperature of the image carrier, wherein the control means changes the target value in accordance with an operation state including a process non-operation using the image carrier. Temperature control device for carrier. 8. The method of claim 1, 2, 3, 4, 5, 6, or 7.
An image forming apparatus, comprising: the image carrier temperature control device according to claim 1. 9. A color image according to claim 8, comprising a plurality of image carriers, and transferring a plurality of color visible images formed on said plurality of image carriers onto a recording material. An image forming apparatus comprising: