JPH047584A - Image forming device - Google Patents

Abstract

PURPOSE:To suppress tribaelectrification due to the rubbing between a recording medium and a cleaning member by controlling the operation of a humidifying means by a temperature control means so that low-humidity environment is not generated in the device. CONSTITUTION:This device is equipped with a recording electrode 1, the recording medium, a developer supply means 3, the cleaning member 11, a humidity detecting means 19 which detects the humidity in the device, the humidifying means 17 which humidifies the inside of the device, and a humidity control means 18. Then the humidity control means 18 controls the operation of the humidifying means 17 according to the humidity in the device which is detected by the humidity detecting means 19 so that the humidity control means 18 performs humidification in the device or stops the humidification. Thus, the humidity control means 18 controls the operation of the humidifying means 17 so that low-humidity environment is not generated in the device, thereby suppressing the triboelectrification due to the rubbing between the recording medium and cleaning member 11.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an image forming apparatus that forms an image by electrostatically adhering a developer to a recording medium.

<Prior art> Various devices have been developed to form images according to image information, and some of these devices use conductive magnetic toner, which is a fine powder developer, to electrostatically transfer the toner to a recording medium. There is an image device that forms an image by attaching it to a surface.

For example, the method shown in Japanese Patent Publication No. 51-46707 has been proposed. As shown in FIG. 12, the non-magnetic cylinder 5
The conductive magnetic toner 51 on the outer periphery of the non-magnetic cylinder 50 is attached to the outer periphery of the cylinder 50 and conveyed by the magnetic field of a rotating magnet 52 provided coaxially with the non-magnetic cylinder 50. Then, the toner 51 is passed through recording electrodes 50a densely arranged along the axial direction on the outer peripheral surface of the non-magnetic cylinder 50,
When the power supply unit 54 is in physical contact with the recording medium 53 formed by laminating a conductive layer 53b and an insulating layer (or dielectric layer) 53a from the inside, which is provided close to the non-magnetic cylinder 50,
Apply voltage by. At this time, by applying a voltage corresponding to the image information between the recording electrode 50a and the conductive layer 53b of the recording medium 53, the insulating layer 53b of the recording medium 53 is
An image is formed by attaching toner 51 to 3a.

In addition, as shown in FIG. 13, an image forming apparatus to which the above image forming method is applied is configured such that a recording medium 53 that is conveyed by a driving conveying roller 55a and a driven conveying roller 55b is moved to a recording electrode 50a by rotation of a magnet roller 56.
The toner 51 is conveyed upward, and an image is formed by attaching or not attaching the toner 51 depending on a signal voltage from the recording control section 57.

For example, the signal voltage from the recording control section 57 is +40V.
When the voltage is applied, the toner 51 adheres to the recording medium 53, and when the voltage is 0, the toner 51 does not adhere. By repeating this operation, image formation is performed.

After the image is displayed in the image display area 58, the toner 51 adhering to the recording medium 53 is rubbed by a cleaning member 59 made of conductive carbon fiber, conductive resin, conductive rubber, etc. It falls onto the roller 56 and is conveyed again in preparation for the next recording.

However, in the above configuration, when the cleaning member 59 rubs against the recording medium 53, an electric charge is generated on the recording medium 53 due to frictional electrification, especially in a low humidity environment, and when the cleaning member 59 passes near the magnet roller 56, the electric charge is generated on the recording medium 53. This may cause the toner 51 to be attracted to the surface of the recording medium 53, causing so-called staining.

In contrast, conventionally, a humidity sensor 60 detects the humidity inside the apparatus, and a power source 61 applies a bias voltage having a polarity opposite to the frictional charging polarity of the recording medium 53 to the cleaning member 59 based on the detected value. He was restraining his head from turning.

<Problems to be Solved by the Invention> However, with the above configuration, due to manufacturing variations associated with mass production of the recording medium 53, the cleaning voltage characteristics with respect to humidity of the recording medium 53 may differ, and it is difficult to suppress fogging. In some cases, it is difficult to do so, or in some cases, it is necessary to change the cleaning voltage characteristics with respect to humidity to match the recording medium 53 each time.

Especially in low humidity environments (relative humidity of about 30% or less),
Since the characteristics of the recording medium 53 differ due to manufacturing variations, there are cases where it is not possible to suppress fogging using the conventional cleaning voltage control method using humidity detection.

An object of the present invention is to provide an image forming apparatus in which frictional electrification between a recording medium and a cleaning member is suppressed by providing a humidifying means in the apparatus to prevent the inside of the apparatus from becoming a low-humidity environment.

Means for Solving the Problems> A typical means for solving the problems of the prior art described above and applied to the embodiments described below is to use a recording electrode and a recording electrode for applying a voltage to the developer according to image information. , a recording medium to which the developer is attached to form an image; a developer supply means for supplying the developer between the recording electrode and the recording medium; a cleaning member for removing the developer that has been washed, a humidity detection means for detecting the humidity inside the apparatus, a humidification means for humidifying the inside of the apparatus, and a cleaning member for removing the humidity detected by the humidity detection means; and humidity control means for controlling the operation of the humidification means.

<Operation> According to the above configuration, the humidity control means controls the operation of the humidifying means so as to humidify the inside of the apparatus or to stop humidifying the inside of the apparatus, depending on the humidity inside the apparatus detected by the humidity detecting means.

Therefore, by controlling the operation of the humidifying means so as not to create a low-humidity environment inside the apparatus using the humidity controlling means, it is possible to suppress frictional electrification caused by rubbing between the recording medium and the cleaning member.

<Embodiment> An embodiment of an image forming apparatus to which the present invention is applied will be described below with reference to the drawings.

[First Embodiment] FIG. 1 is a cross-sectional explanatory diagram showing a schematic configuration of an image forming apparatus, FIG. 2 is a perspective explanatory diagram of a recording electrode, FIG. 3 is a partially enlarged cross-sectional diagram of a recording medium, and FIG. FIG. 5 is a block diagram of the detection means for detecting the humidity inside the apparatus, and is a flowchart showing the operation of the humidification means.

First, the schematic structure of the image forming apparatus will be described with reference to FIGS. 1 to 3.

In FIG. 1, reference numeral 1 denotes a recording electrode for applying a voltage to the developer according to image information. The recording electrode 1 is arranged closely along the axial direction on a convex portion 3a on the outer peripheral surface of a non-magnetic cylinder 3, which is a developer supply means for supplying a conductive magnetic developer (hereinafter referred to as "toner") 2. is attached to.

As shown in FIG. 2, the recording electrode 1 is connected to a drive element 1b provided on the substrate 1a, and the convex portion 3a
A recording portion 1c of the recording electrode 1 that contributes to recording is arranged. Further, a plurality of holes 1d are bored in the substrate 1a along the axial direction of the non-magnetic cylinder 3. These holes 1d are configured so that the toner 2 conveyed on the outer periphery of the non-magnetic cylinder 3 passes in the direction of arrow A and reaches the recording section 1c. Further, the substrate 1a is a flexible printed circuit board, and the drive element 1b
A VFD driver (Oki Electric MSGII63) is used.

As shown in FIG. 1, a rotating magnet 4 is coaxially attached to the non-magnetic cylinder 3. A belt 4b is passed between the rotating magnet 4 and the drive motor 4a.
The rotating magnet 4 is rotationally driven by the drive motor 4a. The toner 2 is attached to the outer peripheral surface of the non-magnetic cylinder 3 and conveyed by the magnetic field formed by the rotating magnet 4.

In the vicinity of the recording electrode 1, an endless heddle-shaped recording sheet 5, which is a recording medium on which toner 2 is attached to form an image, is arranged with a portion of the recording sheet 5 close to it. The recording sheet 5 is passed between a tension roller 6a and a drive roller 6b, which are arranged in a pair above and below, and which serve as conveyance means. A belt 8 is passed between the drive roller 6b and the drive motor 7, and the drive roller 6b is rotationally driven by the drive motor 7 to convey the recording sheet 5 in the direction of arrow B in FIG. It is something to do.

As shown in FIG. 3, the recording sheet 5 is made of a surface layer 5a made of a transparent material whose main component is butyral resin or urethane resin, a colored inorganic substance, and a binder (acrylic resin, plastic resin). A colored layer 5b, a conductive layer 5c deposited with aluminum or ITO (indium and tin oxide) to provide conductivity, and a base material 5d made of a plastic resin such as polyethylene terephthalate, polyethylene, or polypropylene are polymerized. It is configured.

The surface layer 5a and the colored layer 5b are electrically insulated, and the colored layer 5b is made of titanium oxide (T i O□) to produce white as the base color of the screen.

Inorganic materials such as aluminum oxide (Aj!203) are used.

Reference numeral 9 denotes a recording control section for applying a voltage to the recording electrode 1 according to image information. This recording control section 9
A signal voltage corresponding to image information is applied to the conductive layer 5c of the recording sheet 5 to cause the toner 2 to adhere to the surface layer 5a to form an image.

10 is an image display section for externally displaying the image formed on the recording sheet 5; 11 is a back plate 1 of the main body of the apparatus;
2 through a support member 12a. This cleaning member 11 is composed of a cleaning member main body 11a and a soft conductive brush 11b, and by rubbing the brush 11b against the recording sheet 5 at an appropriate angle and distance, the cleaning member 11 is applied to the recording sheet 5. This is to scrape off the adhered toner 2 onto the non-magnetic cylinder 3. As the cleaning member 11,
Materials used include carbon fiber, flexible plastics (polyethylene, polypropylene) that have conductivity when combined, urethane rubber, or silicone.

Further, a non-magnetic member 13 and a magnet 14 for supporting the recording sheet 5 are disposed at a position facing the cleaning member 11 with the recording sheet 5 interposed therebetween.

Furthermore, above the cleaning member 11, a grounding member 15 is provided for grounding the conductive layer 5c exposed on the end surface of the recording sheet 5. This grounding member 15 is composed of a grounding member main body 15a made of the same material as the cleaning member 11 and a brush 15b, and the brush 15b contacts the conductive layer 5c and is grounded.

Further, inside the main body of the apparatus, there are provided a density sensor 16 for detecting the surface reflection density of the recording sheet 5, and a humidifier 17 having a water tank 17a for humidifying the inside of the apparatus. The humidity control circuit 18 is connected to the humidity control circuit 18 disposed in the air conditioner. When the detected value of the concentration sensor 16 is input to the humidity control circuit 18, the operation of the humidifier 17 is controlled according to the detected value.

As the humidifying device I7, for example, one using an ultrasonic transducer is used. This means that the vibration surface of the ultrasonic transducer is
It is fixed to the bottom of a water droplet generating container made of a thin metal plate. When a pulsed voltage is applied to the vibrator, the vibrator starts vibrating and the vibration is transmitted to the metal plate on the bottom of the water droplet generating container. When the amount of water from the water tank 17a is adjusted so that an extremely thin water film is formed on the metal plate, a large amount of extremely fine water droplets are generated on the water surface due to the ultrasonic vibration of the metal plate, and the water droplets are directed upward using a fan or the like. By blowing up the air, the inside of the device can be humidified. Note that the humidifying device 17 is not limited to the above-mentioned method, but may also use a method of emitting moisture by heating, for example.

Further, a humidity sensor 19 is connected to the humidity control circuit 18 for detecting the humidity inside the device.

The humidity sensor 19 has a resistance value that changes depending on the humidity inside the device, and the humidity control circuit 18 is configured to control the operation of the humidifier 1'7 based on the change in the resistance value. .

The toner 2 attached to the outer circumference of the non-magnetic cylinder 3 by the rotating magnet 4 is conveyed onto the recording electrode 1 through the hole 1d of the substrate 1a. At this time, by applying a voltage to the recording electrode 1 according to the image information, the toner 2 can be attached to the recording sheet 5 to form an image. The toner 2 that did not contribute to image formation on the recording electrode l falls from the convex portion 3a of the non-magnetic cylinder 3 and is deposited on the recording sheet 5.
It does not affect the image formed.

The image formed on the recording sheet 5 is transferred to the drive roller 6
By the rotation b, the recording sheet 5 is conveyed in the direction of arrow B in FIG. 1, and when it passes through the image display section 10, it is displayed on the outside. After the recording sheet 5 that has passed through the image display section 10 has its charging history erased by the grounding member 15, the adhering toner 2 is stripped off by the cleaning member 10, and the toner 2 is magnetic cylinder 3
It falls to the top and is transported again to prepare for the next recording.

As shown in FIG. 4, the density sensor 16 is arranged in a non-image forming area between the left end of the recording sheet 5 (left side in the drawing) and the left end of the recording electrode 1 (left end of the image forming area C). It is set up. Since there is no recording electrode 1 in this non-image forming area, no image is formed on the recording sheet 5, and white is always displayed.

Further, the cleaning member 10 is configured to rub the entire width of the recording sheet 5, and the non-image forming area is also rubbed by the brush 10b. Therefore, even in the above-mentioned area, there is a possibility that the recording sheet 5 is frictionally charged due to the rubbing of the brush 10b, and fogging occurs where the toner 2 adheres to the recording sheet 5.

Therefore, by disposing a density sensor 16 in the non-image forming area to detect the fogging state, when the surface reflection density (hereinafter referred to as 'OD (+ft+)) is exceeded,
By operating the humidifying device F to humidify the inside of the device, it is possible to suppress the occurrence of frictional electrification and prevent fogging.

Next, a block diagram of the humidity control means will be explained with reference to FIG.

The OD value and humidity information detected by the concentration sensor 16 and humidity sensor 19 are input to the humidity control circuit 18 and stored. Further, the humidity control circuit 18 operates the humidifier 17 according to the humidity inside the apparatus, and also outputs to the recording control section 9 that the apparatus is in an image display standby state.

The control operation of the humidity control means will be explained with reference to the flowchart shown in FIG.

In step S1, when power is input, the process proceeds to step S2 and shifts to an image display standby state. When an image display signal is input at this time, an image is displayed on the image display section 10.

Next, the process advances to step S3, where the concentration sensor 16 detects the fourth
The OD value of the non-image forming area shown in the figure is detected. In step S4, it is determined whether the OD value is 0.05 or more. If the above OD value is 0.05 or more, step S
In step S5, the humidifier 17 is operated by the humidification control circuit 18 to humidify the inside of the apparatus, and the process proceeds to step S6, where the humidity sensor 19 detects the humidity inside the apparatus. Further, if the above OD value is less than 0°05, step s is performed again.
The process returns to step 2 and shifts to the next image display standby state.

Next, in step S7, it is determined whether the relative humidity is 80% or more, and if it is less than 80%, the process proceeds to step s8 and shifts to an image display standby state. Also at this time, step S
In step 9, the OD value is detected by the concentration sensor 16, and in step SIO, it is determined whether oD4fi is less than 0.05.

If the above OD value is less than 0.05, step S
11, and the operation of the humidifying device 17 is stopped.

If the OD value is 0.05 or more, the process returns to step S6 and the humidity inside the device is detected.

Further, if the relative humidity is 80% or more in step S7, the process proceeds to step Sll and the drive of the humidifying device 17 is stopped.

That is, the operation of the humidifying device 17 is stopped when the relative humidity inside the device is 80% or more, or when the OD value is 0.05.
When it is less than The above OD value is a relative value when the surface reflection density in the initial state of the recording sheet 5 is set to zero, and an OD value of 0.05 is a density that is sufficient to make fog visible on the recording sheet 5. be.

Further, if the relative humidity inside the apparatus is 80% or more, even if the cleaning section +A'll rubs against the recording sheet 5, frictional charging will hardly occur and will not cause fogging.

Next, in step S12, it is determined whether the power is OFF or not. If the power is ON, the operations from step 82 to step 311 are repeated, and if the power is OFF, the humidity control operation is performed. finish.

[Second Embodiment] Next, a second embodiment of the humidity control means in the above embodiment will be described with reference to FIG.

The general configuration of the image forming apparatus is the same as that of the first embodiment, but in this embodiment, the right end of the recording electrode is extended to coincide with the widthwise end of the recordable area of the recording sheet, and the cleaning member is extended. The difference is that the right end is similarly extended and that a plurality of density sensors are provided to detect the surface reflection density of the recording sheet.

The recording electrode 20 is disposed long on the right side of the image forming area C of the recording sheet 5, and extends to the vicinity of the conductive layer 5C located at the edge of the recordable area in the width direction of the recording sheet 5. The right end of the recording electrode 2° and the left end of the conductive layer 5c must not be in a position where they overlap in the vertical direction of the recording sheet 5 in order to prevent a short circuit accident. Further, a signal voltage is applied to a non-image forming area (arrow E in the figure) surrounded by the image forming area C and the conductive layer 5c by the second recording electrode 2o. A density sensor 21 is provided in the non-image forming area E to detect the surface reflection density thereof. This density sensor 21 is configured to constantly or periodically detect the surface reflection density of the non-image forming area E together with the density sensor 16, and input the detected value to the humidity control circuit 18.

In a normal usage environment, the surface reflection density in the image forming area C has an OD value of 1.10 or more. However, as the relative humidity increases, the resistance value of the surface layer 5a of the recording sheet 5 decreases, making it easier for charges to escape, and there is a risk that there will not be enough charge to attract the toner 2 during recording, resulting in a decrease in recording density. be. Furthermore, depending on manufacturing variations in the recording sheet 5, the recording density may decrease even when the relative humidity is less than 80%.

Therefore, in this embodiment, the condition for operating the humidifying device 17 is that the detected value of the concentration sensor "16 is 0.05 OD value.
It is controlled by the humidity control circuit 18 to operate as described above. Further, the conditions for the humidification device 17 to stop are when the detection value of the concentration sensor 16 becomes less than 0.05 in terms of OD value, or when the relative humidity inside the device becomes 80% or more, and furthermore, when the humidity When the detected value of the sensor 21 becomes less than 1.10 in terms of OD value, the controller is controlled to stop the operation by the humidity control circuit 18 when at least one condition is satisfied.

Therefore, according to this embodiment, the detected value of the concentration sensor 21 is O.
By stopping the operation of the humidifying device 17 when the D value becomes less than 1.10, it is possible to prevent a decrease in the recording density in the image forming area C, and also to prevent the recording density from decreasing depending on humidity or due to manufacturing variations in the recording sheet 5. Fog of the toner 2 can be prevented.

[Third Embodiment] Next, a third embodiment of the humidity control means in the above embodiment will be described with reference to FIG.

The general configuration of the image forming apparatus is the same as that of the first embodiment, but in this embodiment, the recording sheet 5 is used instead of the density sensor 16 for detecting the surface reflection density of the recording sheet 5.
The difference is that a detection brush 22 made of the same material as the cleaning member 11 is arranged to rub against the non-image forming area D (on the left side of the drawing).

The detection brush 22 is composed of a detection brush main body 22a and a soft, conductive brush 22b, and is configured to rub the recording sheet 5 with the brush 22b at an appropriate angle and distance. The detection brush 22 is disposed downstream of the cleaning member 9 in the conveying direction of the recording sheet 5 so as to rub against the non-image forming area. The brush 11b of the cleaning member 11 rubs against the recording sheet 5, and the triboelectric charge is transferred to the detection brush 22.
The humidity control circuit 18 controls the operation of the humidifier 17 through feedback control. Therefore, recording sheet 5
As the amount of frictional electrification increases, the amount of current flowing through the detection brush 22 increases, so by detecting the current value, it is possible to detect whether or not the recording sheet 5 is prone to fogging.

Next, a block diagram of the humidity control means will be explained with reference to FIG.

The current value of the current flowing from the detection brush 22 is detected by a current value detection circuit 23. This current value and the humidity information detected by the humidity sensor 19 are input to the humidity control circuit 18 and stored. In addition, the humidity control circuit 1
8 is a humidifying device 1 according to the current value and the humidity inside the device.
7 and outputs to the recording control section 9 that it is in an image display standby state.

The above humidity control operation will be explained below with reference to the flowchart shown in FIG.

In step S1, when power is input, the process proceeds to step S2 and shifts to an image display standby state. When an image display signal is input at this time, an image is displayed on the image display section 10.

Next, the process proceeds to step S3, where the current value j in the non-image forming area shown in FIG. 8 is detected by the detection brush 22 via the current value detection circuit 23. In step S4, it is determined whether the second current value i is within the range -0.5 μA≦i≦0.5 μA. -The above current value i is i<-Q, 5μA
Alternatively, if i > 0.5 μA, the process proceeds to step S5, where the humidification control circuit 18 operates the humidifier 17 to humidify the inside of the apparatus, and the process proceeds to step S6, where the humidity sensor 19 measures the humidity inside the apparatus. To detect. Further, if the current value i is within the range of 0.5 μA≦j≦0.5 μA, the process returns to step S2 again and shifts to the image display standby state.

Next, in step S7, it is determined whether the relative humidity is 80% or more, and if it is less than 80%, the process proceeds to step S8 and shifts to an image display standby state. Also at this time, step S
In step 9, the current value i flowing from the detection brush 22 is detected, and in step SIO, a part of the current value i is detected. 5
It is determined whether μA≦21≦0.5 μA.

If the current value i is within the range of -0.5μA≦i≦0.5μ, the process proceeds to step 311 and the humidifying device 1
Stop the operation of 7. Also, the above current value i is i<-0,5
If μA or i >0.5 μA, the process returns to step S6 and the humidity inside the device is detected.

Further, if the relative humidity is 80% or more in step S7, the process proceeds to step Sll and the drive of the humidifying device 17 is stopped.

That is, the operation of the humidifying bag f17 is stopped when the current value i is within the range of -0.5 μA≦i≦0.5 μA or when the relative humidity inside the device is 80% or more. The above current value i depends on the material of the recording sheet 5 or the detection brush 2.
The influence of the material etc. of No. 2 is small, and i l >0.5 μ
It is known that A is likely to cause fogging.

Next, in step SI2, it is determined whether the power is off or not. If the power is on, the operations from step S2 to step Sll are repeated again. If the power is off, the humidity control operation is performed. finish.

According to the above configuration, it is possible to reliably predict that fogging will occur on the recording sheet 5 before starting the image forming operation, and to prevent its occurrence.

[Fourth Example] Next, a fourth example of the humidity control means in the above example will be described with reference to FIG.

The general configuration of the image forming apparatus is the same as that of the first embodiment, but in this embodiment, fogging is suppressed by controlling only the humidity inside the apparatus without detecting the surface reflection density of the recording sheet 5. That is. Therefore, the difference is that the concentration sensor 1621 shown in the first to third embodiments does not exist.

Frictional charging between the recording sheet 5 and the cleaning member 11 is suppressed by constantly or periodically detecting the humidity inside the apparatus using the humidity sensor I9 and controlling the apparatus so that the inside of the apparatus does not become a low-humidity environment. be.

Specifically, the humidity control circuit 18 operates and stops the humidifying device 17 so that the humidity inside the device is maintained at 50% to 70% relative humidity by the humidity sensor 19, thereby suppressing frictional charging. This prevents fog from occurring.

- According to the structure described above, the sensor section and its accompanying circuits can be omitted, and the device can be simplified and the cost can be reduced.

<Effects of the Invention> As described above, the present invention reduces frictional electrification caused by rubbing between the recording medium and the Kleinige member by controlling the operation of the humidifying means to prevent the inside of the apparatus from becoming a low-humidity environment. It can be suppressed.

Therefore, it is possible to prevent developer from sloshing due to frictional electrification of the recording medium.

In particular, in the case where the operation of the humidifying means is controlled according to the detected value of the reflection density detection means for detecting the surface reflection density of the recording medium, a decrease in the recording density in the image forming area is prevented, and It is possible to prevent developer from sloshing, which does not depend on humidity or is caused by variations in the manufacturing process of recording media.

Further, when the current value flowing through the detection member that rubs the recording medium is detected by the current detection means to control the operation of the humidification means, fogging may occur on the recording medium before starting the image forming operation. can be reliably predicted and prevented from occurring.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional explanatory diagram showing a schematic configuration of an image forming apparatus, FIG. 2 is a perspective explanatory diagram of a recording electrode, FIG. 3 is a partially enlarged cross-sectional view of a recording medium, and FIG. 4 is a front view of the image forming apparatus. Explanatory diagram,
FIG. 5 is a block diagram of the detection means for detecting the humidity inside the device, FIG. 6 is a flowchart showing the operation of the humidity control means, and FIGS. 7 to 11 are explanatory diagrams showing other humidity control means. FIGS. 12 and 13 are explanatory diagrams of conventional examples. 120 is a recording electrode, 1a is a substrate, ■b is a driving element, 1c
1d is a recording part, 1d is a hole, 2 is a toner, 317 is a non-magnetic cylinder, 3a is a convex part, 4 is a rotating magnet, 4a and 7 are drive motors,
4b, 8 is a heald, 5 is a recording sheet, 5a is a surface layer, 5
b is a colored layer, 5C is a conductive layer, 5d is a base material, 6a is a tension roller, 6b is a drive roller, 9 is a recording control unit, 10
1 is an image display section, 11 is a cleaning member, lla is a cleaning member main body, Ilb, 15b, 22b are brushes, 1
2 is a back plate, 12a is a support member, 13 is a non-magnetic member, 14
is a magnet, 15 is a grounding member, 15a is a grounding member body, 16
．． 21 is a concentration sensor, 17 is a humidifier, 17a is a water tank,
18 is a humidity control circuit, 19 is a humidity sensor, 22 is a detection brush, and 22a is a detection brush body. Figure 5

Claims (3)

[Claims] (1) A recording electrode for applying a voltage to a developer according to image information, a recording medium to which the developer is attached to form an image, and a developer between the recording electrode and the recording medium. a cleaning member for removing adhering developer by rubbing the recording medium; a humidity detection means for detecting humidity inside the apparatus; and a humidity detection means for humidifying the inside of the apparatus. an image forming apparatus comprising: a humidifying means for controlling the humidity; and a humidity controlling means for controlling the operation of the humidifying means in accordance with the humidity detected by the humidity detecting means. (2) The image according to claim (1), further comprising a reflection density detection means for detecting a surface reflection density of the recording medium, and controlling the operation of the humidification means according to a detected value of the reflection density detection means. Forming device. (3) It has a detection member for rubbing the recording medium, and a current detection means for detecting the value of the current flowing through the detection member, and the humidification means is adjusted according to the detected value of the current detection means. The image forming apparatus according to claim 1, wherein the image forming apparatus controls the operation.