JP3340221B2 - Method of transferring developed image in wet image forming apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for transferring a developed image in a wet image forming apparatus such as a full-color copying machine, a facsimile, a printer, etc., and more particularly, to a method for forming a latent image on the surface of a latent image carrier based on image data. A developing solution in which toner is dispersed in a liquid carrier is supplied to the surface of the latent image carrier to develop the latent image, and then the developed image is transferred to a transfer material by a transfer unit. And a transfer method.

[0002]

2. Description of the Related Art In a wet image forming apparatus, a latent image formed on a latent image carrier is formed into a developed image using a developing solution in which toner is dispersed in a liquid carrier, and the developed image is transferred to a transfer material. Conventionally, as a method of transferring a developed image, a transfer material is superimposed on the developed image, a corona charge having a polarity opposite to that of the toner is applied from the back of the transfer material, or the toner is pressed against the back of the transfer material by directly contacting a roller. For example, there is a method of transferring a developed image to a transfer material by applying a voltage having a polarity opposite to that of the toner to the roller. In the above-described wet image forming apparatus, a carrier liquid layer having a thickness of 100 to 200 μm is formed on the surface of the latent image carrier having passed through the developing area. Even if the transfer material is transferred onto the surface of the latent image carrier in this state, the adhesion between the liquid layer and the transfer material is deteriorated, and the transfer efficiency is reduced. On the other hand, even if all the carrier liquid is removed,
On the contrary, the transfer efficiency deteriorates.

[0003]

Therefore, conventionally, in the above-mentioned wet image forming apparatus, excess carrier liquid is squeezed while leaving a minimum amount of carrier liquid necessary for transfer. As a specific method of squeezing the excess carrier liquid, a squeeze roller and a corona discharger are disposed with a predetermined distance from the surface of the latent image carrier, and a squeeze roller is disposed. By rotating the latent image carrier in the opposite direction to the latent image carrier in the area facing the latent image carrier, applying a predetermined bias voltage to the squeeze roller, or generating ions of the same polarity as the toner by a corona discharger There is a method of irradiating the latent image carrier with the ions.

[0005]

The amount of the carrier liquid adhering to the surface of the latent image carrier varies depending on the viscosity of the developing solution, the amount of toner adhering, and the like. Further, the amount of the carrier liquid attached affects the transfer efficiency. For example, when the attached amount of the carrier liquid is large, the adhesiveness between the transfer material and the toner is deteriorated. When the amount of toner is small, the adhesion between the transfer material and the toner is good, so that a relatively weak transfer force is appropriate.

However, in the conventional method of squeezing the excess carrier liquid, since the surface of the latent image carrier is uniformly squeezed, the amount of toner is large, and accordingly, a portion having a large amount of carrier liquid and a small amount of toner are small. Accordingly, the same amount of the carrier liquid is squeezed in the part where the carrier liquid is small and in any part. Therefore, in a portion with a large amount of toner, a large amount of the carrier liquid is not squeezed because it is held inside the toner, and a relatively large amount of the carrier liquid remains. In a portion with a small amount of toner, the carrier liquid becomes insufficient. There was sometimes.

Here, in the above conventional transfer method,
Since the developed image is transferred with a uniform transfer force, the same amount is applied to both the portion where the amount of the carrier liquid is large due to the large amount of the toner and the portion where the carrier liquid is small due to the small amount of the toner. Transfer with transfer force. Therefore, since the amount of toner is large, the portion of the carrier liquid that accompanies the relatively large amount of unsqueezed carrier liquid remaining inside the toner after squeezing as described above has a relatively low transfer force. In addition, in the portion where the amount of the carrier liquid is small due to the small amount of the toner, the carrier liquid becomes insufficient after the squeezing as described above, so that there is a problem that the transfer force becomes excessive and the image is disturbed.

The present invention has been made in view of the above problems, and an object of the present invention is to improve the transfer efficiency by changing the transfer force of a transfer unit based on image data, thereby improving the transfer efficiency. An object of the present invention is to provide a method of transferring a developed image in a wet image forming apparatus capable of obtaining a good image. In addition, transfer of the transfer means is performed based on the image data.
By changing the shooting power, transfer efficiency can be improved,
Wet image forming apparatus capable of obtaining good images without
Is to provide an installation.

[0009]

To achieve the above Symbol purpose SUMMARY OF THE INVENTION The invention of Claim 1, to form a latent image on the latent image bearing member surface on the basis of images data, the latent image bearing member surface After developing the latent image by supplying a developer in which a toner is dispersed in a liquid carrier, the latent image is developed and then opposed to the surface of the latent image carrier at a predetermined interval, and ions of the opposite polarity to the toner are discharged. The developed image on the latent image carrier is transferred by transfer means comprising a corona discharger that generates and irradiates the ions onto the back surface of the transfer material superimposed on the developed image on the surface of the latent image carrier. In the method of transferring a developed image in a wet image forming apparatus for transferring to a material, the amount of ion irradiation by the corona discharger is calculated for each of a predetermined number of pixels in at least a longitudinal direction of the latent image carrier based on the image data, So that each electrode substantially corresponds to the predetermined number of pixels. A first electrode composed of an electrode group arranged in the direction in an insulated state, and a second electrode arranged to face the first electrode in an insulated state from the corona discharger side, A control electrode arranged such that a slit portion extending in the longitudinal direction of the latent image carrier is located between the corona discharger and the surface of the latent image carrier, and a developed image on the surface of the latent image carrier. An electric field that irradiates the calculated amount of ions generated from the corona discharger to the back surface of the superposed transfer material is applied to the first electric field.
A voltage formed between the electrode and the second electrode is applied to transfer the developed image on the latent image carrier. According to a second aspect of the present invention, a latent image is formed on the surface of a latent image carrier based on image data, and a developer in which toner is dispersed in a liquid carrier is supplied to the surface of the latent image carrier to form the latent image. After the development, the latent image carrier is disposed so as to oppose the surface of the latent image carrier with the transfer material interposed therebetween and directly contact the rear surface of the transfer material, and at a portion facing the latent image carrier, the latent image carrier In a wet image forming apparatus that rotates in the same direction as above, and transfers the developed image on the latent image carrier to the transfer material by a transfer unit including a transfer roller to which a bias voltage having a polarity opposite to that of the toner is applied. In the method of transferring a developed image, the bias voltage is calculated for each of a predetermined number of pixels in at least a longitudinal direction of the latent image carrier based on the image data, so that each electrode substantially corresponds to the predetermined number of pixels. Transfer rollers arranged in this direction while being insulated from each other La of the electrode group, the calculated the bias voltage is applied, is characterized in that to transfer the developing image formed on the latent image bearing member. According to a third aspect of the present invention, a latent image is formed on the surface of a latent image carrier based on image data.
And toner is dispersed in a liquid carrier on the surface of the latent image carrier.
After developing the latent image by supplying the developing solution thus obtained,
It is arranged facing the surface of the latent image carrier at a predetermined interval.
To generate ions of opposite polarity to the toner,
On the transfer material superimposed on the developed image on the surface of the latent image carrier
The transfer means is constituted by a corona discharger for irradiation.
A wet image for transferring the developed image on the latent image carrier to the transfer material
A latent image holding device based on the image data;
At least every predetermined number of pixels in the longitudinal direction of the body
Calculating means for calculating the ion irradiation amount by the Rona discharger;
Insulated from each other so that each electrode roughly corresponds to the predetermined number of pixels
A first electrode comprising an electrode group arranged in the direction in the state;
Opposed to the first electrode in an insulated state from the corona discharger side
And a second electrode arranged in such a manner that
A slit portion extending in the direction
And a control electrode disposed so as to be located between the holding body surfaces.
And a back of a transfer material superimposed on the developed image on the surface of the latent image carrier.
The ion generated from the corona discharger on the surface is calculated by the calculation means.
An electric field that irradiates only the calculated amount is applied to the first electrode and the first electrode.
A voltage to be formed between the two electrodes is applied to the latent image carrier.
The above developed image is transferred.
According to a fourth aspect of the present invention, there is provided a latent image carrier based on image data.
A latent image is formed on the surface, and a liquid carrier is formed on the surface of the latent image carrier.
Supplying a developer in which toner is dispersed to develop the latent image
After that, the transfer material is sandwiched between the surface of the latent image carrier and the latent image carrier.
Facing the back side of the transfer material,
The same direction as the latent image carrier at the portion facing the latent image carrier
And a bias voltage having a polarity opposite to that of the toner is applied.
Transfer of the latent image by a transfer means comprising a transfer roller
Wet image forming apparatus for transferring the developed image on the body to the transfer material
At a small amount of the latent image carrier based on the image data.
At least for each predetermined number of pixels in the longitudinal direction,
Calculating means for calculating the pressure, and each electrode being substantially equivalent to the predetermined number of pixels.
Correspondingly arranged in this direction insulated from each other
An electrode group of a transfer roller, and an electrode group of the transfer roller,
Applying the bias voltage calculated by the calculation means,
Transferring the developed image on an image carrier
It is.

[0010]

[Action] In the invention of claim 1 or 3, co ion irradiation amount of corona discharger is calculated for each pixel of a predetermined number of the latent image bearing member longitudinal direction based on the image data. Then, an electric field is applied to the control electrode between the first electrode and the second electrode such that the back surface of the transfer material superimposed on the developed image on the surface of the latent image carrier is irradiated with ions by an amount calculated for each predetermined pixel. Since the voltage to be formed therebetween is applied, the transfer force of the corona discharger to the developed image on the latent image carrier can be changed corresponding to each predetermined pixel in the direction of the image data. In the invention according to claim 2 or 4, the transfer force for the developed image on the latent image carrier is determined by a bias voltage applied to the transfer roller. Here, the bias voltage applied to the transfer roller is calculated for each of a predetermined number of pixels in the longitudinal direction of the latent image carrier based on the image data, and the bias voltage calculated for each of the predetermined pixels is provided in the direction of the transfer roller. Since the voltage is applied to the applied electrode group, the transfer force of the transfer roller to the developed image on the latent image carrier can be changed corresponding to each predetermined pixel in the direction of the image data.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to an electrophotographic copying machine (hereinafter, referred to as a copying machine) as an image forming apparatus will be described. FIG. 1 is a schematic configuration diagram of a main part of a copying machine according to the present embodiment. The photosensitive drum 1, which is a latent image carrier, is rotated at a constant speed in the direction of arrow a during copying. Then, the outer peripheral surface of the photosensitive drum 1 is uniformly charged in the dark from the main charger 2, and then the developing laser image is irradiated and formed by the exposure laser scanner 3 to form an electrostatic latent image. Next, the portion outside the image forming area on the outer peripheral surface of the photosensitive drum 1 is removed by the eraser 4. Thereafter, the electrostatic latent image is visualized by the wet developing device 5 while passing through the region facing the wet developing device 5. The visualized electrostatic latent image is transferred from a transfer material 6 fed from a sheet feeding device (not shown).
The transfer is performed by a transfer charger (hereinafter, referred to as a transfer corona discharger) 7 including a corona discharger as a transfer unit. After the transfer material 6 is separated from the photosensitive drum 1, residual toner is removed by a cleaning blade 8. The direction in which the cleaning blade 8 is disposed may be the trailing direction or the counter direction. Thereafter, the residual potential is removed from the surface of the photosensitive drum 1 by the charge removing lamp 9 to prepare for the next copy.

In the wet developing device 5, a developing container 51 is provided.
A developing roller 52 as a developer carrying member and a squeeze roller 53 as a surplus liquid removing means are arranged in close proximity to the photosensitive drum 1 in image forming order. In addition to the developing roller 52, a developing plate, a sponge roller, or the like may be used as the developer carrier, and these may be employed. In this embodiment, the developing roller 52 will be described as an example. The developing roller 52 is driven to rotate in a direction indicated by an arrow b which is a reverse rotation direction to the photosensitive drum 1 by a driving unit such as a motor (not shown). Above the developing roller 52, a developing solution supply unit 54 for supplying a developing solution to the developing roller 52 is provided.
A scraper 55 is provided on the right side of the developing roller 52 in the drawing, with its end contacting the outer peripheral surface of the developing roller 52. The developing solution in which the toner is dispersed in the liquid carrier supplied from the developing solution supply unit 54 accumulates in a wedge-shaped portion 56 formed by the developing roller 52 and the scraper 55. The roller 52 is supplied to a developing unit facing the roller 52.

As the surplus liquid removing means, there are a corona discharger, an air knife and the like in addition to the squeeze roller 53. In this embodiment, a roller squeeze using a squeeze roller 53 will be described as an example. The squeeze roller 53 is disposed so as to be in close proximity to the photosensitive drum 1. And the surface of the squeeze roller 53 is anodized,
It is preferable that the surface portion has a resistance value of 10 ⁹ Ωcm or more. The squeeze roller 53 is driven by driving means such as a motor (not shown) by an arrow c in the same direction as the photosensitive drum 1.
The excess carrier liquid on the photosensitive drum 1 after development is squeezed by being driven to rotate in the direction. A squeeze roller scraper 57 is disposed on the outer peripheral surface of the squeeze roller 53 at the end thereof in contact with the squeeze roller 53 on the downstream side in the rotation direction from the area facing the photosensitive drum 1. The squeeze roller scraper 57 is a squeeze roller 5
3. Clean the developer adhering to the surface.

As the transfer means, in addition to the transfer corona discharger 7, there is a transfer roller, corona transfer via a dielectric film, or the like. In the present embodiment, a corona charge transfer using the transfer corona discharger 7 will be described as an example. The transfer corona discharger 7 generates ions having a polarity opposite to that of the toner (negative ions in the present embodiment), and applies the ions from the back surface of the transfer paper 6 superimposed on the toner image on the photosensitive drum 1. The transfer paper 6 is charged and the photosensitive drum 1
, And at the same time, the toner is transferred to the transfer paper 6 by Coulomb force.

An image processing device 32 to which a reading device 31 is connected is connected to the exposure laser scanner 3.
Further, an exposure data accumulator 33 is connected to the image processing device 32, and a voltage controller 34 is connected to the exposure data accumulator 33, and a voltage applying device 35 is connected to the voltage controller 34.

Next, the transfer of the toner image on the photosensitive drum 1 in the copying machine having the above configuration will be described. The reading device 31 reads a document and sends image data A to the image processing device 32. The image processing device 32 stores the image data A
Is subjected to image processing to obtain image data B, and this image data B is output to the exposure laser scanner 3 and the exposure data accumulating device 33. The exposure laser scanner 3 exposes the photosensitive drum 1 according to the image data B. On the other hand, the exposure data accumulating device 33 is used to transfer the image data B received from the image processing device 32 and the image formed on the photosensitive drum 1 based on the image data B and developed by the wet developing device 5. Transfer necessary amount of ions Corona discharger 7
Has a conversion table or a conversion formula with the voltage value to be generated, and converts the image data B into a voltage value for transfer according to the conversion table or the conversion formula. Here, the conversion unit of the image data is as follows in the main scanning direction.
Since the discharge amount of the transfer corona discharger 7 is uniform in the axial direction (main scanning direction) of the photosensitive drum 1, the discharge amount corresponds to one line, and the sub-scanning direction can be set arbitrarily. For example, the conversion is performed in units of the number of scanning lines falling within the width of the corona discharge in the sub-scanning direction (drum surface moving direction). Then, the exposure data accumulating device 33 sends a signal of a necessary voltage value to the voltage applying device 35 via the voltage control device 34. The voltage applying device 35 that has received the signal of the voltage value from the exposure data accumulating device 33 applies a voltage to the transfer corona discharger 7 based on the signal. Then, the transfer corona discharger 7 to which the voltage converted based on the image data B is applied by the voltage application device 35 generates ions in an amount based on the image data B and transfers the ions on the surface of the photosensitive drum 1. By irradiating the transfer paper 6 from the back surface of the transfer paper 6 superimposed on the toner image, the transfer paper 6 is charged and adsorbed on the photosensitive drum 1, and at the same time, the toner is transferred to the transfer paper 6 by Coulomb force.

Incidentally, as described above, the transfer means may be a transfer roller. An example in which a transfer roller is used as a transfer unit will be described with reference to FIG. 2, the same components as those in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and the description thereof is omitted. 2 differs from FIG. 1 in that a transfer roller 27 is used instead of the transfer corona discharger 7 as a transfer unit. The transfer roller 27 is disposed so as to face the photosensitive drum 1, is driven to rotate in a direction indicated by an arrow d which is a reverse rotation direction to the photosensitive drum 1 by driving means such as a motor (not shown), and comes into direct contact with the back of the transfer paper 6. Then, transfer is performed by applying a voltage having a polarity opposite to that of the toner.

In the copying machine according to this embodiment, similarly to the above-described embodiment, the exposure laser scanner 3 uses the exposure laser scanner 3 based on the image data read by the reading device 31 and subjected to image processing by the image processing device 32. An electrostatic latent image is formed on the photosensitive drum 1 and is converted into a predetermined voltage by an exposure data accumulating device 33, a voltage control device 34, and a voltage applying device 35. In the present embodiment, the toner image on the photosensitive drum 1 after development is transferred to the transfer paper 6 by the voltage applied to the transfer roller 27 by the voltage application device 35. (Hereinafter, margin)

Next, another embodiment for transferring images for every several pixels in the axial direction of the photosensitive drum will be described. In this embodiment, a corona discharger is used as the transfer unit, as in the embodiment shown in FIG. Specifically, for example, a corona discharger 7 'of a slit control type as shown in FIG. 3 is used. That is, in the corona discharger 7 ′ shown in FIG. 3, between the corotron wire 71 and the photosensitive drum 1
A pair of control electrodes 10 extending in the axial direction of the photoconductor drum 1 are provided side by side in the rotation direction of the photoconductor drum 1, and the corotron wire 71 is connected to the photoconductor drum 1 by slits 11 between the respective control electrodes 10. It can face each other. Each control electrode 10 includes an insulating layer 101,
It is composed of a single electrode 102 and a thin wire electrode 103,
Corotron wire 71 of insulating layer 101 having a thickness of 100 μm
A uniform single electrode 102 is provided on the surface on the side, and a thin line electrode 103 of 8 lines / mm is provided on the surface of the insulating layer 101 on the photosensitive drum 1 side. Here, the thin line electrodes 103 in the present embodiment are provided so as to substantially correspond to a predetermined number of pixels in the axial direction of the photosensitive drum, and are based on image data of several pixels corresponding to each thin line electrode 103. The determined voltage is applied.

In the corona discharger 7 'having the above structure, a corona discharge is caused between the single electrode 102 and the corotron wire 71 to generate ions (negative ions in this embodiment) having the opposite polarity to the toner. Let it. This ion
The direction of the movement is determined by the direction of the electric field generated between the single electrode 102 and the thin wire electrode 103 in each of the pair of control electrodes 10. That is, when the direction of the electric field is the direction from the single electrode 102 to the thin wire electrode 103, the ions move toward the photosensitive drum 1 through the slit 11 according to the direction of the electric field. Further, the direction of the electric field is changed from the thin wire electrode 103 to the single electrode 10.
When the direction is toward 2, the ions move toward the corotron wire 71 according to the direction of the electric field. Further, by determining the intensity of the electric field, the amount of ion irradiation to the photosensitive drum 1 can be controlled. That is, as the intensity of the electric field from the single electrode 102 to the thin wire electrode 103 is increased, the amount of ion irradiation in the direction of the photosensitive drum 1 can be increased. According to the corona discharger 7 ′, the direction and intensity of the electric field are determined for each of the opposed thin wire electrodes 103 of the pair of control electrodes 10, so that the predetermined number of pixels in the axial direction of the photosensitive drum 1 are determined. In addition, it is possible to finely control the ion moving direction and the ion irradiation amount in the direction of the photosensitive drum 1.

In the present embodiment having the above-described configuration, an amount of ions to be irradiated is applied to the corona discharger 7 '(corotron wire 71) for each predetermined number of pixels in the axial direction of the photosensitive drum based on image data. ), The single electrode 102 and the thin wire electrode 1
Calculate a voltage that can be formed between the voltage and the voltage V.03. Here, the voltage to be applied to the thin wire electrode 103 of the corona discharger 7 ′ based on the image data can be realized by, for example, the same method as the embodiment according to FIG. When each voltage calculated for each of the predetermined number of pixels is applied to the thin line electrode 103 corresponding to each of the predetermined number of pixels, the single electrode 1
Negative ions generated between the wire 02 and the corotron wire 71 pass through the slit 11 toward the photosensitive drum 1 by a forward electric field (direction from the single electrode 102 to the thin wire electrode 103) for each dot in the slit 11. The movement to the photoreceptor drum 1 is restricted by the electric field in the opposite direction (the direction from the thin wire electrode 103 to the single electrode 102). The ions that have passed through the slit 11 due to the forward electric field are accelerated and converged by the electric field formed between the electrode on the back surface of the photosensitive drum 1 and the control electrode 10, and are condensed on the photosensitive drum 1 every predetermined number of pixels. A transfer force corresponding to the amount of toner or carrier liquid adhered to the developed image is generated. In the present embodiment, the single electrode 102 and the fine wire electrode 103 are insulated by interposing the insulating layer 101. Instead, the two electrodes are opposed to each other with a gap therebetween. The electrodes may be in an insulated state.

Here, even when a transfer roller is used in place of the corona discharger 7 ', the excess carrier liquid can be squeezed for every several pixels in the axial direction of the photosensitive drum as in the above embodiment. An example in this case will be described. As shown in FIG. 4, the transfer roller 27 'according to this embodiment includes, for example, electrodes 271' arranged in the main scanning direction in a state of being insulated from each other. It is desirable that the surface of each electrode 271 'is anodized to have a resistance of about 10 ⁹ Ωcm or more. Each electrode 271 'is provided so as to substantially correspond to a predetermined number of pixels in the axial direction of the photosensitive drum. Here, the transfer roller 27 'provided with such an electrode 271' can be formed by integrating a disc-shaped electrode and a disc-shaped insulator in an alternately arranged state to form a roller. Also, the ring-shaped electrode 271 ′
Can be formed in the annular recess for fitting the electrode 271 ′ formed on the support roller. When a conductive material is used as the support roller material, an insulator is interposed between the concave portion and the electrode.

In this embodiment, the voltage applied to each electrode 271 'is calculated for each of a predetermined number of pixels in the axial direction of the photosensitive drum based on image data, as in the embodiment shown in FIG. The calculation of this voltage can be realized in the same manner as in the embodiment according to FIG. In this embodiment, the predetermined number of pixels are determined by the pressure of the transfer roller 27 ′ and the voltage calculated for each of the predetermined number of pixels and applied to the electrode 271 ′ corresponding to each of the predetermined number of pixels. The toner image on the photosensitive drum 1 is transferred for each pixel.

As described above, according to the present embodiment, the force for transferring the toner image on the photosensitive drum 1 can be controlled based on the image data. Further, the transfer force can be controlled for each predetermined number of pixels in the axial direction of the photosensitive drum. The method of transferring a developed image according to the present invention is applicable to all wet image forming apparatuses having a transfer unit capable of changing a transfer force.

[0025]

According to the first or third aspect of the present invention, the amount of voltage applied to the control electrode is determined by the image data in the main scanning direction.
By adjusting the transfer force in both the sub-scanning direction and changing the transfer force, for example, a relatively weak transfer force is used for each of the above-described highlight portions for a few pixels, so that proper transfer is performed, and a relatively strong transfer force is used for the dark portion. Thus, there is an effect that the transfer rate can be improved and an image free of image deletion or the like can be obtained. According to the second or fourth aspect of the invention, the squeeze roller can have an independent electrode effect in the main scanning direction, and the length of the latent image carrier of the transfer roller is determined by image data not only in the sub-scanning direction but also in the main scanning direction. The transfer force can be changed by adjusting the amount of voltage applied to the electrode group provided in the direction. In a dark portion, the transfer rate is improved by setting a relatively strong transfer force, and there is an effect that an image without image deletion or the like can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a main part of a copying machine according to an embodiment.

FIG. 2 is a schematic configuration diagram of a main part of a copying machine according to another embodiment.

FIG. 3 is a schematic configuration diagram of a corona discharger according to another embodiment.

FIG. 4 is a schematic configuration diagram of a transfer roller according to another embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 photoconductor drum 2 main charger 3 exposure laser scanner 4 eraser 5 wet developing device 6 transfer material 7 transfer corona discharger 7 ′ corona discharger 8 cleaning blade 9 static elimination lamp 10 control electrode 11 slit 27 transfer roller 27 ′ transfer roller 31 Reading device 32 Image processing device 33 Exposure data accumulating device 34 Voltage control device 35 Voltage applying device 51 Developing container 52 Developing roller 53 Squeeze roller 54 Developing solution supply unit 55 Scraper 56 Wedge-shaped portion 57 Squeeze roller scraper 71 Corotron wire 101 Insulating layer 102 Single electrode 103 Fine wire electrode 271 'electrode

Claims (4)

(57) [Claims] 1. A latent image carrier having a latent image on a surface thereof based on image data.
An image is formed and toner is applied to the liquid carrier on the surface of the latent image carrier.
After developing the latent image by supplying a developer in which
At a predetermined distance from the surface of the latent image carrier.
To generate ions of a polarity opposite to that of the toner.
On the back of the transfer material with the ON on the developed image on the latent image carrier
Transfer means consisting of a corona discharger that irradiates the surface
Transferring the developed image on the latent image carrier to the transfer material
In a method of transferring a developed image in an image forming apparatus , at least a length of the latent image carrier is determined based on the image data.
The corona discharger for every predetermined number of pixels in the
Calculate ON irradiation dose and each electrode roughly corresponds to the specified number of pixels
Electrodes arranged in the direction insulated from each other so that
And a first electrode made of, and insulated from the corona discharger side
A second electrode arranged to face the first electrode.
The slit extending in the longitudinal direction of the latent image carrier is
So that it is located between the Rona discharger and the surface of the latent image carrier.
The control electrode provided overlaps the developed image on the surface of the latent image carrier.
Ions generated from the corona discharger on the back of the transfer material
An electric field that irradiates the first electrode with the calculated amount.
A voltage to be formed between the second electrode and the second electrode is applied,
Wet image characterized by transferring the developed image on a holding body
A method for transferring a developed image in a forming apparatus. 2. A latent image carrier having a latent image based on image data.
An image is formed and toner is applied to the liquid carrier on the surface of the latent image carrier.
After developing the latent image by supplying a developer in which
To face the latent image carrier surface with a transfer material interposed therebetween,
The latent image is disposed so as to directly contact the back surface of the transfer material, and
Rotates in the same direction as the latent image carrier at the part facing the carrier
Transfer to which a bias voltage having a polarity opposite to that of the toner is applied.
Transfer means constituted by rollers on the latent image carrier
In a wet image forming apparatus for transferring the developed image to the transfer material,
In the method of transferring a developed image , at least the longitudinal direction of the latent image carrier is determined based on the image data.
Calculate the bias voltage for each predetermined number of pixels in the direction
And, together so that each electrode is substantially corresponding to the pixels of the predetermined number
In the electrode group of the transfer roller arranged in the direction in an insulated state,
Applying the calculated bias voltage to the latent image carrier
Wet image forming apparatus for transferring the developed image
Transfer method of the developed image in the above. 3. A latent image carrier having a latent image based on image data.
An image is formed and toner is applied to the liquid carrier on the surface of the latent image carrier.
After developing the latent image by supplying a developer in which
At a predetermined distance from the surface of the latent image carrier.
To generate ions of a polarity opposite to that of the toner.
On the back of the transfer material with the ON on the developed image on the latent image carrier
Transfer means consisting of a corona discharger that irradiates the surface
Transferring the developed image on the latent image carrier to the transfer material
In the image forming apparatus, at least the length of the latent image carrier is determined based on the image data.
The corona discharger for every predetermined number of pixels in the
The calculating means for calculating the ON irradiation amount is insulated from each other so that each electrode substantially corresponds to the predetermined number of pixels.
A first electrode comprising an electrode group arranged in the direction in the state;
Opposed to the first electrode in an insulated state from the corona discharger side
And a second electrode arranged in such a manner that
A slit portion extending in the direction
And a control electrode disposed so as to be located between the holding body surfaces.
Provided on the rear surface of the transfer material superimposed on the developed image on the surface of the latent image carrier.
The ions generated from the corona discharger are calculated by the calculation means.
An electric field for irradiating the first electrode and the second electrode
And a voltage to be formed between the latent image carrier and
A wet image forming apparatus for transferring a developed image. 4. A latent image carrier on a surface of a latent image carrier based on image data.
An image is formed and toner is applied to the liquid carrier on the surface of the latent image carrier.
After developing the latent image by supplying a developer in which
To face the latent image carrier surface with a transfer material interposed therebetween,
The latent image is disposed so as to directly contact the back surface of the transfer material, and
Rotates in the same direction as the latent image carrier at the part facing the carrier
Transfer to which a bias voltage having a polarity opposite to that of the toner is applied.
Transfer means constituted by rollers on the latent image carrier
In a wet image forming apparatus for transferring the developed image to the transfer material
And at least the longitudinal length of the latent image carrier based on the image data.
The bias voltage is calculated for each predetermined number of pixels in the direction.
And the calculation means are insulated from each other so that each electrode substantially corresponds to the predetermined number of pixels.
In this state, the transfer roller electrode group arranged in the direction is set.
Only, the electrode assembly of the transfer roller, calculated by the calculated detection means該Ba
Applying a bias voltage to transfer the developed image on the latent image carrier
A wet image forming apparatus.