JPH10340004A - High-viscosity liquid coating device and image forming device provided therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent density irregularity by eliminating the ruggedness of high- viscosity liquid developer on a developing belt. SOLUTION: A bar-like coating body 613 provided in a direction orthogonal to the carrying direction of the developing belt 62 as a longitudinal direction is equipped with plural liquid extrusion holes arranged in a direction orthogonal to the carrying direction of the belt 62 on the carrying upstream side of the belt 62. The coating body 613 is equipped with uniform and fine ruggedness on its contact surface with the belt 62. The coating body 613 forms the thin layer of high-viscosity liquid on the surface of the belt 62 by extruding the high-viscosity liquid from the liquid extrusion hole, and the surface of the thin layer of the high-viscosity liquid formed on the surface of the belt 62 is leveled by a contact part with the high-viscosity liquid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-viscosity liquid applying apparatus for applying a high-viscosity liquid and an image forming apparatus provided with the high-viscosity liquid applying apparatus, and more particularly, to the uniformity of a high-viscosity liquid applied to a liquid application target. It relates to improvement of image quality and image quality.

[0002]

2. Description of the Related Art In general, when a high-viscosity liquid is sandwiched between two members, and after the high-viscosity liquid is attached to both members, the two members are separated and a liquid film is provided on the member surface. Occur. This is because when a highly viscous liquid splits into two,
This is because the thread is divided in a manner that pulls the thread, and finally the thread-like part is cut and the part rises.

[0003] In a high-viscosity liquid application apparatus for applying a high-viscosity liquid, the phenomenon that the high-viscosity liquid separates like a string in the same manner, and finally the thread-like portion is cut and the portion rises. It has occurred.

[0004] As a highly viscous liquid coating apparatus, for example, a liquid developing apparatus using a developing belt is considered. When a thin layer of high-viscosity liquid developer, which is a high-viscosity liquid, is formed on a developing belt of a liquid developing device using a roller, as described above, when the roller and the developing belt separate, the high-viscosity liquid developer on the developing belt is removed. Unevenness occurs on the surface of the thin layer. When the latent image on the photoreceptor is developed in the state of the high-viscosity liquid developer on the developing belt as it is, shading occurs in a portion that should have the same density after the development. On the other hand, for example, there is a method of smoothing out irregularities on the surface of the high-viscosity liquid developer on the developing belt with a wire bar or the like in which a wire is wound around a rod-shaped body.

[0005]

However, in the method of leveling the surface of the high-viscosity liquid developer on the developing belt with a wire bar or the like, the method of applying the high-viscosity liquid developer onto the developing belt and the height of the high-viscosity liquid developer on the developing belt are reduced. A portion for leveling the viscous liquid developer is required, which complicates the device configuration and increases the size of the device.

SUMMARY OF THE INVENTION The present invention has been made to solve such a disadvantage, and has as its object to uniformly apply a high-viscosity liquid such as a high-viscosity liquid developer with a simple structure.

[0007]

A high-viscosity liquid coating apparatus according to the present invention has a rod-shaped coating body provided with a longitudinal direction perpendicular to the direction of transport of a liquid application target, and the rod-shaped coating body is a liquid coating liquid. A plurality of liquid extrusion holes arranged in a direction perpendicular to the direction of transport of the liquid application object are provided on the upstream side of the conveyance of the application object, and uniform fine irregularities are provided on the contact surface with the liquid application object, and the liquid extrusion is performed. The high-viscosity liquid is discharged from the hole, a thin layer of high-viscosity liquid is formed on the surface of the liquid application target, and the surface of the thin layer of high-viscosity liquid formed on the surface of the liquid application target is smoothed to increase the size of the device. The high-viscosity liquid is uniformly applied to the surface of the liquid application target body without performing.

[0008] Further, the rod-shaped coating body has a round rod shape.

In the rod-shaped coating body, a cross section of the liquid application target in a conveying direction at a contact portion with the high-viscosity liquid draws an arc having a convex portion on the liquid application target side.

Further, the rod-shaped coated body is wound with a thin wire to provide uniform fine irregularities on the contact surface with the liquid coated object.

In addition, the rod-shaped coating body has a thread on the surface, and uniform fine irregularities are provided on the contact surface with the liquid application object.

[0012] The surface of the rod-shaped coating body is covered with a thin ring-shaped material except for the portion where the liquid extrusion hole is provided, and uniform fine irregularities are provided on the contact surface with the liquid coating target body.

[0013] A high-viscosity liquid coating apparatus according to another aspect of the present invention includes:
A high-viscosity liquid supply unit that has a high-viscosity liquid supply unit and a rod-shaped application body, and has uniform fine irregularities on the contact surface with the liquid application object A plurality of liquid supply nozzles arranged in a direction perpendicular to the direction of transport of the body are provided, each liquid supply nozzle supplies a high-viscosity liquid to the surface of the rod-shaped application body, and the rod-shaped application body is orthogonal to the transport direction of the liquid application target object The liquid application target object is provided with a uniform fine unevenness on a contact surface with the liquid application target object, and the high viscosity liquid supplied from the high viscosity liquid supply unit is applied to the liquid application target object. The surface of the high-viscosity liquid applied to the liquid is leveled, and the high-viscosity liquid is uniformly applied to the surface of the liquid application target.

[0014] Further, another high-viscosity liquid coating apparatus according to the present invention includes:
A liquid supply having a high-viscosity liquid supply unit and a rod-shaped application body, wherein the high-viscosity liquid supply unit is provided with a longitudinal direction in a direction orthogonal to the liquid conveyance direction of the liquid application object on the upstream side of the liquid application object conveyance of the rod-shaped application body. A slit is provided, the liquid supply slit supplies a high-viscosity liquid to the surface of the rod-shaped application body, and the rod-shaped application body is provided with the longitudinal direction perpendicular to the transport direction of the liquid application object, and the liquid supply slit contacts the liquid application object. Highly viscous liquid supplied from the high viscous liquid supply unit is applied to the liquid application target object, and the surface of the high viscous liquid applied to the liquid application target is smoothed out. Is uniformly applied to the surface of the liquid application target body.

Further, a high-viscosity liquid developer is used as the high-viscosity liquid, and the developer carrier to be applied with the liquid is a visible image formed on the image carrier by using the high-viscosity liquid developer. Become

An image forming apparatus provided with a high-viscosity liquid application device includes a high-viscosity liquid application device and a developer carrier.
The high-viscosity liquid coating apparatus has a rod-shaped coating body provided with a longitudinal direction perpendicular to the transport direction of the developer carrier, and the rod-shaped coating body transports the liquid coating target body upstream of the liquid coating target transport. A plurality of liquid extrusion holes arranged in a direction perpendicular to the direction, and also provided with fine irregularities on the surface, a high-viscosity liquid developer is discharged from the inside of the rod-shaped application body through the liquid extrusion holes, and the surface of the developer carrier A thin layer of high-viscosity liquid developer is formed on the surface of the developer carrier, and the surface of the thin layer of high-viscosity liquid developer formed on the surface of the developer carrier is leveled. The electrostatic latent image formed on the body is developed, and the developed image is transferred to a recording medium.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A high-viscosity liquid applying apparatus according to the present invention uniformly applies a high-viscosity liquid developer, which is a high-viscosity liquid, to the surface of a liquid application object formed of, for example, a developing belt. By uniformly applying a high-viscosity liquid developer, which is a high-viscosity liquid, to a developing belt, which is an object to be applied, it is possible to prevent shading from occurring in a portion that should have the same density after development.

The high-viscosity liquid coating apparatus has, for example, a coating liquid tank, a pump, and a rod-shaped coating body. The coating liquid tank stores a high-viscosity liquid such as a high-viscosity liquid developer applied to a liquid application target such as a developer carrier. Here, as the developer carrier, for example, there is an endless developing belt. The pump pumps up the high-viscosity liquid stored in the coating liquid tank and supplies it to the rod-shaped coating body. The rod-shaped coating body is provided with a direction perpendicular to the transport direction of the developing belt as a longitudinal direction, and a plurality of liquid extrusion holes arranged in a direction perpendicular to the transport direction of the liquid coating target object on the upstream side of the transport of the liquid coating target object. And uniform fine irregularities on the contact surface with the liquid application target. The rod-shaped application body extrudes the high-viscosity liquid developer supplied from the pump from each liquid extrusion hole based on the pressure of the pump, and forms a thin layer of the high-viscosity liquid developer on the surface of the developing belt. Here, since the rod-shaped application body has uniform fine irregularities on the contact surface with the liquid application object, the high-viscosity liquid extruded from each liquid extrusion hole is made uniform in a direction orthogonal to the transport direction of the developing belt. It can be applied to a developing belt.

Further, the rod-shaped coated body makes the surface of the thin layer of the high-viscosity liquid developer formed on the surface of the developing belt at a contact portion with the thin layer of the high-viscosity liquid developer formed on the surface of the developing belt. In this manner, by combining the portion where the high-viscosity liquid developer is applied to the development belt and the portion where the high-viscosity liquid developer is leveled on the development belt into one, irregularities remain on the surface of the high-viscosity liquid developer. It is possible to prevent such a problem and to simplify the device configuration.

As described above, for example, by forming a uniform thin layer of a high-viscosity liquid developer on the surface of a developing belt, an electrostatic latent image on a photoreceptor can be developed at a uniform and appropriate density in an image forming apparatus, for example. And it is possible to prevent the occurrence of shading in a portion that should have the same density after development.

[0021]

FIG. 1 is a block diagram of an image forming apparatus provided with a high-viscosity liquid applying apparatus according to one embodiment of the present invention. As shown in the figure, an image forming apparatus provided with a high-viscosity liquid coating device includes a photosensitive member 1, a first charging roller 2, a pre-wet unit 3, a second charging roller 4, an exposure unit 5, a developing unit 6, and a set roller 7. , A transfer roller 8, a first discharging lamp 9, a cleaning blade 10, and a second discharging lamp 11. The photosensitive member 1 includes a first charging roller 2 and a second charging roller 4.
And an electrostatic latent image is formed on the surface by exposure of the exposure unit 5. The pre-wet unit 3 includes a pre-wet liquid tank 31, a suction roller 32, an application roller 33, and an application roller 34, and is stored in the pre-wet liquid tank 31 on the surface of the photoconductor 1 after being charged by the first charging roller 2. The pre-wet liquid 91 is applied.

The developing unit 6 includes a high-viscosity liquid coating device 6
1, developing belt (developer carrier) 62 and belt roller 6
3 to 67. The high-viscosity liquid application device 61 has an application liquid tank 611, a pump 612, and a rod-shaped application body 613. The coating liquid tank 611 stores a high-viscosity liquid developer 92 to be applied to the developing belt 62. The pump 612 pumps up the high-viscosity liquid developer 92 stored in the coating liquid tank 611, and
Supply 3 As shown in FIG. 2, the rod-shaped coating body 613 is a developing belt 6 stretched by belt rollers 63 to 67.
2 is provided with the direction orthogonal to the transport direction (direction indicated by arrow A in the figure) as the longitudinal direction. Rod-shaped coating body 613
Is, for example, formed in a round bar shape and has a fine mesh surface
The surface is covered with 14 to give fine irregularities. The rod-shaped coating body 613 has a plurality of liquid extrusion holes 615 arranged on the upstream side of the transport of the developing belt 62 in a direction orthogonal to the transport direction of the developing belt 62. The rod-shaped coating body 613 is hollow, and extrudes the high-viscosity liquid developer 92 supplied from the pump 612 through the high-viscosity liquid supply port 616 from each liquid extrusion hole 615 based on the pressure of the pump 612. The high-viscosity liquid developer 92 extruded from each of the liquid extrusion holes 615 travels along the concave portion on the surface of the rod-shaped coating body 613 and is thus
The toner flows into the developing belt 62 after being substantially averaged in a direction orthogonal to the transport direction of the second belt 2, and a thin layer of the high-viscosity liquid developer 92 is formed on the surface of the developing belt 62. The rod-shaped coating body 613 is in contact with the thin layer of the high-viscosity liquid developer 92 formed on the surface of the developing belt 62, and the surface of the thin layer of the high-viscosity liquid developer 92 formed on the surface of the developing belt 62 is contacted. Smooth out. In this way, by combining the portion where the high-viscosity liquid developer 92 is applied to the development belt 62 and the portion where the high-viscosity liquid developer 92 on the development belt 62 is leveled into one, the high-viscosity liquid development on the development belt 62 is performed. The unevenness can be prevented from remaining on the thin layer surface of the agent 92, and the device configuration can be simplified.

The developing belt 62 is a high-viscosity liquid coating device 61
The pre-wet unit 3 makes the thin layer of the high-viscosity liquid developer 92 formed on the surface contact the photoreceptor 1 via the pre-wet liquid 91 applied to the photoreceptor 1, and forms an electrostatic latent image on the photoreceptor 1. Develop to form a visible toner image. here,
Since the thin layer surface of the high-viscosity liquid developer 92 on the developing belt 62 is made uniform, the electrostatic latent image on the photoreceptor 1 can be developed at a uniform and appropriate density. It is possible to prevent the occurrence of shading in a portion that should become a shade.

The toner image formed by the development of the developing unit 6 is transferred to the transfer paper 1 by the transfer bias of the transfer roller 8.
Transfer to 0. First static elimination lamp 9 and second static elimination lamp 1
Reference numeral 1 denotes a portion after the transfer of the toner image on the photoreceptor 1 to remove electricity. The cleaning blade 10 scrapes off the remaining high-viscosity liquid developer 92 from the portion of the photoconductor 1 after the transfer of the toner image.

Here, in the above embodiment, the rod-shaped coating body 613 is used.
Is formed in a round bar shape. For example, as shown in FIG. 3, the developing belt 6 at the contact portion 617 between the thin layer of the high viscous liquid developer 92 formed on the surface of the developing belt 62 and the rod-shaped coating body 613 is used.
The section in the conveyance direction of 2 may draw an arc having a convex portion in the direction of the developing belt 62, and the upper side of the rod-shaped coating body 613 may be flat.

Further, in the above embodiment, fine irregularities 614 are provided on the surface of the rod-shaped coating body 613. For example, as shown in FIG. The rod-shaped application body 613 may be covered with a thin ring-shaped material 619 having a portion corresponding to the liquid extrusion hole 615 as shown in FIG. 5, and the surface of the rod-shaped application body 613 may be provided with irregularities.

Further, as shown in FIG.
The surface of the rod-shaped coating body 613 may be provided with irregularities by providing a thread 620 on the surface.

Next, as another embodiment, as shown in FIG. 7, a high-viscosity liquid application device 61 is provided with a high-viscosity liquid supply section 621.
And a rod-shaped coating body 613 having fine irregularities on the surface. The high-viscosity liquid supply unit 621 is provided on the upstream side of the rod-shaped coating body 613 in the direction of conveyance of the developing belt, with the direction perpendicular to the direction of conveyance of the developing belt 62 as the longitudinal direction. The high-viscosity liquid supply unit 621 includes a plurality of liquid supply nozzles 622 as shown in FIG. Each liquid supply nozzle 6
Reference numeral 22 denotes a high-viscosity liquid developer 92 on the surface of the rod-shaped coating body 613.
Supply. The rod-shaped coating body 613 is provided at a predetermined interval from the surface to be coated of the developing belt 62 with the longitudinal direction perpendicular to the transport direction of the developing belt 62. The rod-shaped application body 613 applies the high-viscosity liquid developer 92 supplied from the high-viscosity liquid supply unit 621 to the development belt 62, and applies the high-viscosity liquid developer 92 applied to the development belt 62.
Is smoothed at the contact portion 617 with the high-viscosity liquid developer 92. In this case, since the liquid supply nozzle 622 is used, the amount of the high-viscosity liquid developer 92 can be easily adjusted as compared with the case where the high-viscosity liquid developer 92 is discharged from the liquid extrusion hole 615.

The high-viscosity liquid supply unit 621 uses the liquid supply nozzle 622 to supply the high-viscosity liquid developer 92 to the surface of the rod-shaped application body 613, as shown in FIG. A liquid supply slit 623 having a longitudinal direction provided in a direction perpendicular to the conveyance direction of the developing belt 62 is provided on the upstream side of the conveyance, and the high viscosity liquid developer 92 is supplied from the liquid supply slit 623 to the surface of the rod-shaped coating body 613. May be.

[0030]

As described above, according to the present invention, fine rods are provided on the surface of a rod-shaped coating body provided with the longitudinal direction perpendicular to the transport direction of the liquid coating target object, and the surface of the liquid coating target object is provided. A plurality of liquid extrusion holes are provided on the upstream side of the conveyance, a high-viscosity liquid is discharged from the liquid extrusion holes, a thin layer of the high-viscosity liquid is formed on the surface of the liquid application object, and the high-viscosity liquid formed on the liquid application object surface Since the surface of the thin layer is smoothed, the highly viscous liquid can be uniformly applied to the surface of the liquid application target without increasing the size of the apparatus.

Further, since the rod-shaped application body has a round bar shape, the resistance to the liquid application object can be reduced.

Further, since the cross section of the rod-shaped coating body in the conveying direction of the liquid coating target at the contact portion with the highly viscous liquid draws an arc having a convex portion on the liquid coating target side, resistance to the liquid coating target is reduced. it can.

Further, since the rod-shaped coated body is provided with fine irregularities on the surface by winding a fine wire, it has a simple structure.
Irregularities can be provided on the surface.

Further, since the rod-shaped coated body is provided with threads on the surface to provide fine irregularities on the surface, the irregularities can be formed on the surface with a simple structure.

Further, since the surface of the rod-shaped application body is covered with a thin ring-shaped material except for the portion where the liquid extrusion hole is provided, and the surface is provided with fine irregularities, the surface can be provided with a simple structure. In addition, it is possible to prevent the supply of the high-viscosity liquid from being hindered.

In addition, a plurality of liquid supply nozzles arranged in a direction perpendicular to the direction in which the liquid application object is conveyed are arranged on the upstream side of the liquid application object conveyance of the rod application object having fine irregularities on the surface. The viscous liquid is supplied, and the rod-shaped application body is provided with the longitudinal direction perpendicular to the transport direction of the liquid application target object, and applies the high viscosity liquid supplied from the high viscosity liquid supply unit to the liquid application target object, The surface of the high-viscosity liquid applied to the liquid application target is smoothed, and the high-viscosity liquid is uniformly applied to the surface of the liquid application target, so that the high-viscosity liquid is applied to the surface of the liquid application target without increasing the size of the apparatus. And the supply amount of the highly viscous liquid can be easily controlled.

In addition, a liquid supply slit having a longitudinal direction perpendicular to the direction of transport of the liquid application object is provided on the upstream side of the liquid application object conveyance of the rod-shaped application object having fine irregularities on the surface, so that the height of the rod application object surface can be increased. The viscous liquid is supplied, and the rod-shaped application body is provided with the longitudinal direction perpendicular to the transport direction of the liquid application target object, and applies the high viscosity liquid supplied from the high viscosity liquid supply unit to the liquid application target object, The surface of the high-viscosity liquid applied to the liquid application target is smoothed, and the high-viscosity liquid is uniformly applied to the surface of the liquid application target, so that the high-viscosity liquid is applied to the surface of the liquid application target without increasing the size of the apparatus. And the supply amount of the highly viscous liquid can be easily controlled.

Further, a high-viscosity liquid developer is used as the high-viscosity liquid, and the developer carrier, which is a liquid application target, visualizes the electrostatic latent image formed on the image carrier with the high-viscosity liquid developer. Therefore, it is possible to prevent the occurrence of uneven density or the like in the developed image.

In the image forming apparatus provided with the high-viscosity liquid coating device, it is possible to prevent the occurrence of density unevenness or the like in the developed image, thereby improving the image quality.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a perspective view of a rod-shaped coating body.

FIG. 3 is a perspective view of a rod-shaped coating body having a flat upper portion.

FIG. 4 is a perspective view of a rod-shaped coating body around which a thin wire is wound.

FIG. 5 is a perspective view of a rod-shaped coating body covered with a thin ring-shaped material.

FIG. 6 is a perspective view of a rod-shaped coating material provided with a thread.

FIG. 7 is a perspective view of a high-viscosity liquid supply section and a rod-shaped application body.

FIG. 8 is a perspective view of a high-viscosity liquid supply unit provided with a liquid supply nozzle.

FIG. 9 is a perspective view of a high-viscosity liquid supply unit provided with a liquid supply slit.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 photoconductor 2 first charging roller 3 pre-wet unit 5 exposure unit 6 developing unit 61 high-viscosity liquid application device 611 application liquid tank 612 pump 613 rod-shaped application body 614 net-like member 615 liquid extrusion hole 616 high-viscosity liquid supply port 618 wire 619 Ring-shaped material 620 Thread 621 High-viscosity liquid supply section 622 Liquid supply nozzle 623 Liquid supply slit 62 Developing belt 8 Transfer roller 9 First static elimination lamp 10 Cleaning blade 92 High-viscosity liquid developer

Claims (10)

[Claims] 1. A rod-shaped coating body provided with a longitudinal direction perpendicular to a direction in which the liquid coating target is transported, wherein the rod-shaped coating is transported upstream of the liquid coating target in a direction in which the liquid coating target is transported. And a plurality of liquid extrusion holes arranged in a direction perpendicular to the liquid application target, and a uniform fine unevenness on a contact surface with the liquid application target object, and a high-viscosity liquid is discharged from the liquid extrusion hole to the liquid application target surface. A high-viscosity liquid coating apparatus, wherein a thin layer of a high-viscosity liquid is formed, and the surface of the thin layer of the high-viscosity liquid formed on the surface of the liquid application target body is leveled at a contact portion with the high-viscosity liquid. 2. The high-viscosity liquid coating apparatus according to claim 1, wherein the rod-shaped coating body has a round rod shape. 3. The high-viscosity liquid application according to claim 1, wherein the rod-shaped application body has a cross section in a conveying direction of the liquid application object at a contact portion with the liquid application object, drawing an arc having a convex portion on the liquid application object side. apparatus. 4. The high-viscosity liquid coating apparatus according to claim 1, wherein the rod-shaped coating body is provided with a uniform fine unevenness on a contact surface with the liquid coating target body by winding a thin wire. 5. The high-viscosity liquid application apparatus according to claim 1, wherein the rod-shaped application body has a thread on its surface, and uniform fine irregularities are provided on a contact surface with the liquid application object. 6. The rod-shaped application body is covered with a thin ring-shaped material having a portion provided with a liquid extruding hole, and has uniform fine irregularities on a contact surface with a liquid application object. High viscosity liquid coating device. 7. It has a high-viscosity liquid supply section and a rod-shaped application body,
The high-viscosity liquid supply section includes a plurality of liquid supply nozzles arranged in a direction perpendicular to the liquid application object transport direction on the upstream side of the rod-shaped application object for transporting the liquid application object. The viscous liquid is supplied, and the rod-shaped application body is provided with the longitudinal direction perpendicular to the transport direction of the liquid application object, provided with uniform fine irregularities on the contact surface with the liquid application object, and a high-viscosity liquid supply unit. A high-viscosity liquid applied from a liquid application target body, and leveling the surface of the high-viscosity liquid applied on the liquid application target body at a contact portion with the high-viscosity liquid . 8. It has a high-viscosity liquid supply section and a rod-shaped application body,
The high-viscosity liquid supply unit includes a liquid supply slit provided with a longitudinal direction in a direction orthogonal to the liquid application object transport direction on the upstream side of the rod-shaped application body for transporting the liquid application object. The viscous liquid is supplied, and the rod-shaped application body is provided with the longitudinal direction perpendicular to the transport direction of the liquid application object, provided with uniform fine irregularities on the contact surface with the liquid application object, and a high-viscosity liquid supply unit. A high-viscosity liquid applied from a liquid application target body, and leveling the surface of the high-viscosity liquid applied on the liquid application target body at a contact portion with the high-viscosity liquid . 9. A high-viscosity liquid developer is used as the high-viscosity liquid, and a developer carrier, which is a liquid application target, converts an electrostatic latent image formed on an image carrier into a visible image using the high-viscosity liquid developer. The high-viscosity liquid application device according to any one of claims 1 to 8, wherein the high-viscosity liquid application device is used. 10. A high-viscosity liquid application device and a developer carrier, wherein the high-viscosity liquid application device has a rod-shaped application body provided with a direction orthogonal to a transport direction of the developer carrier being a longitudinal direction, The rod-shaped application body has a plurality of liquid extrusion holes arranged in a direction orthogonal to the conveyance direction of the developer carrier on the upstream side of the conveyance of the developer carrier, and uniform fine unevenness on a contact surface with the developer carrier. A high-viscosity liquid developer is discharged from the inside of the rod-shaped application body through a liquid extrusion hole, a thin layer of the high-viscosity liquid developer is formed on the surface of the developer carrier, and the high-viscosity liquid developer is formed on the surface of the developer carrier. The surface of the thin layer of viscous liquid developer is leveled at the contact portion with the high-viscosity liquid, and the developer carrier is an electrostatic latent image formed on the photoreceptor using the thin layer of liquid developer formed on the surface A high-viscosity liquid coating device, which is characterized by developing an image and transferring the developed image to a recording medium. Image forming apparatus provided.