JPH05238050A - Image forming device - Google Patents

Abstract

PURPOSE:To make it possible to arrange a record electrode on a cylindrical member having a small diameter and improve conveyance of developer. CONSTITUTION:A rigid substrate 2 having a record electrode 1 and a signal voltage applying IC 3 mounted thereon and a circuit substrate 4 having a circuit member 5 mounted thereon are secured on planes 6a and 6b formed by scraping a peripheral face of a sleeve 6, respectively. Thereafter, connecting terminals between the record electrode 1 and the signal voltage applying IC 3 and between the signal voltage applying IC 3 and the circuit substrate 4 are connected by wire bonding, respectively. The signal voltage applying IC 3, a wire 8 and the circuit member 5 are covered with a sealing resin 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a printer or a display device, and more particularly, to a recording medium by supplying a developer between a recording electrode and a recording medium and applying a signal voltage to the recording electrode. The present invention relates to an image forming apparatus that electrostatically attaches a developer to form an image.

[0002]

2. Description of the Related Art Conventionally, in this type of apparatus, there is known one which forms an image by the method described in Japanese Patent Publication No. 51-46707. As shown in FIG. 11, this rotates a rotating magnet 52 contained in a fixed non-magnetic cylinder (hereinafter simply referred to as a “sleeve”) 51 to rotate a conductive / magnetic toner 53 on the sleeve 51. The magnet 52 is conveyed in the direction opposite to the rotating direction and passed over the recording electrode 54 made of a magnetic material. By applying a signal voltage from the recording controller 55 to the recording electrode 54, the recording charge is changed to the toner 53.
Grounded conductive layer on the back side of the recording medium 56
Due to the Coulomb force with 56b, the dielectric layer 56a on the surface side
The toner 53 is electrostatically attached to the toner to form an image.

[0003] FIG.
There is a display device shown in 12. The same members as those shown in FIG. 12 are designated by the same reference numerals and the description thereof will be omitted. In the display device, the conductive / magnetic toner 53 contained in the developing container 57 is attached to the outer peripheral surface of the sleeve 51 by the rotating magnetic field formed by the rotating magnet 52 provided so as to be included in the sleeve 51. To transport. Then, the toner 51 is passed through the recording electrode 54 provided on the outer peripheral surface of the sleeve 51, and when the toner 51 is in physical contact with the endless belt-shaped recording medium 56 provided in the vicinity of the sleeve 51, A signal voltage corresponding to image information is applied to the recording electrode 54 from the recording control unit 55, and a recording charge is injected into the toner 53 to electrostatically adhere the toner 53 to the recording medium 56 to form an image. .. For example, the toner 53 adheres to the recording medium 56 when the signal voltage from the recording controller 55 is applied +30 V, and the toner 53 does not adhere when the signal voltage is 0 V to form an image.

The recording medium 54 on which an image has been formed is a pair of conveying rollers.
After the image is formed on the image display unit 59 after being conveyed by the 58, the toner 53 is scraped into the developing container 57 by using the cleaning member 60 and the cleaning magnet 61, and is used again for image formation. Is configured.

In the above display device, the recording electrode
As shown in FIG. 13, an electrode array is formed in the longitudinal direction of the sleeve 51, and a flexible substrate 62 having a metal portion at its tip exposed is attached to the peripheral surface of the sleeve 51, as shown in FIG. There is a way. Flexible board 62
A large number of through holes 62a for conveying the toner 53 are formed therein.

As a method capable of forming a higher density electrode array in order to further increase the recording density, a recording head 63 formed by patterning a metal thin film on a rigid substrate as shown in FIG. Proposed. This recording head
Reference numeral 63 shows a structure in which a rigid substrate 64 made of ceramic or the like is used as an electrode supporting member, and the recording electrodes 54 are formed on the rigid substrate 64 by a method similar to the semiconductor manufacturing process, so that the electrode pitch is increased. That is, after forming a metal thin film on a rigid substrate, a resist is applied, exposure and etching are performed to form an electrode pattern, and each electrode and the drive IC are electrically connected to each other. Specifically, the IC 65 for applying the signal voltage is mounted on the rigid substrate 64, and the IC drive circuit 66 having mounted parts such as a connector, a resistor and a capacitor for driving the IC 65 for applying the signal voltage is provided on the circuit board 67. It is implemented. Then, the rigid board 64 and the circuit board
67 is mounted on a support member 68, and both are electrically connected.

A structure for mounting the recording head 63 on the sleeve 51 will be described with reference to FIG. In FIG. 15, the dimensions of each part of the recording head 63 are the diameter of the sleeve 51.
40 mm, the circumferential length of the recording head 63 is 20 mm, and the thickness is 2 mm except for the mounting parts 67 on the surface of the recording head. The signal voltage application IC 65 and the IC drive circuit 66 are covered with a sealing resin 69 that also serves as insulation and protection. Further, in order to easily fix the recording head 63, a part of the sleeve 51 may be
Processing is performed so as to form a flat surface portion 51a having a width of mm, and a supporting member 68 is fixed so that the end portion of the recording head 63 is aligned with the end portion of the flat surface portion 51a. Since the thickness of the sleeve 51 is limited, the width of the flat portion 51a cannot be set to 14 mm or more. Therefore, the upstream side of the recording head 63 in the toner conveying direction is fixed in a state of floating above the surface of the sleeve 3. Therefore, a gap is formed between the support member 68 and the sleeve 51.

The presence of the above-mentioned gap not only hinders the conveyance of the toner 53, but also causes the toner 53 to invade, accumulate and be compressed in the gap, and a force for pushing up the recording head 63 acts to fix the recording head 63. May be weakened to cause deterioration of the toner. As a countermeasure against this, a recording head support base 70 is provided in the gap to support the upstream side of the recording head 63 in the toner conveyance direction, and the inclination of the recording head support base 70 is used to smoothly convey the toner 53. Was configured.

[0009]

However, in the above-mentioned conventional example, the upstream end of the recording head 63 in the toner conveying direction is
Since it is located farthest from the rotating magnet 52, the carrying force of the toner 53 is weak, and if even a small obstacle that does not matter on the surface of the sleeve 51 exists in this area, it may get over this obstacle or 2 When the toner 53 passes through the above obstacles, the toner 53 may be accumulated, and these may serve as nuclei to form a toner wall, which may hinder the toner conveyance.

The above problem can be solved by shortening the length of the recording head 63 in the toner carrying direction and thinning it in order to ensure the carrying property of the toner 53, but it is not technically easy. The cost may increase. That is, in order to reduce the length of the recording head 63, it is necessary to reduce the size of the signal voltage applying IC 65 and the electrode length of the recording electrode 54, but to reduce the size of the IC, it is necessary to further increase the degree of circuit integration. However, it is difficult to achieve dramatic miniaturization with the current semiconductor process technology, and even if it can be miniaturized, the area for providing the bonding pads required for connection does not change. It cannot be transformed. Further, the electrode length also needs a minimum length for obtaining a good image, and cannot be easily shortened.

In consideration of commercialization, it is necessary to reduce the diameters of the rotary magnet 52 and the sleeve 51 in order to reduce the size and weight. Even if the recording head length is the same in the circumferential direction, the rotary magnet 52 and the sleeve 51 should be attached to the sleeve 51 having a smaller diameter. It was desired to be constructed.

Further, the rigid board 64 and the circuit board 67 are supported by a supporting member.
Since it has to be mounted on the 68 and electrically connected to each other, it becomes a factor of cost increase, and when the density of the electrode array is increased, the connection becomes difficult. Further, the higher the density of the recording electrodes 54, the more difficult the connection becomes, and the yield is lowered. Even if the recording electrodes 54 can be connected, the number of steps is increased and the production efficiency may be lowered.

The present invention has been made to solve the above-mentioned problems of the prior art. The object of the present invention is to enable the recording electrodes to be arranged on a cylindrical member having a small diameter and to improve the developer transportability. An object is to provide an image forming apparatus. It is another object of the present invention to provide an image forming apparatus in which the manufacturing cost is reduced by downsizing and high density of the recording electrode and the apparatus is downsized.

[0014]

A typical means for solving the above-mentioned problems of the prior art and applied to the embodiments described below is to provide a plurality of recording electrodes and a recording signal to the recording electrodes. Recording electrode driving means, a movable recording medium for forming an image by adhering a developer by the recording electrode, and a cylindrical member for supplying the developer between the recording electrode and the recording medium. A developer supply means, the recording electrodes and the recording electrode driving means are separately mounted on a plurality of rigid substrates, each rigid substrate is fixedly arranged on a cylindrical member, and these are electrically connected. Is characterized by.

A plurality of recording electrodes, recording electrode driving means for applying a recording signal to the recording electrodes, a movable recording medium for forming an image by adhering a developer by the recording electrodes, A developer supplying means for supplying a developer between the recording electrode and the recording medium, and an output terminal of a recording signal applying element in the recording electrode driving means is used as the recording electrode. And

[0016]

According to the above construction, the recording electrodes and the recording electrode driving means are separately mounted on a plurality of rigid substrates, each rigid substrate is fixedly arranged on the cylindrical member, and these are electrically connected. It is possible to arrange the recording electrodes and the recording electrode driving means on the cylindrical member having a small diameter without making the recording signal applying element, the circuit board and the like fine. Further, since the developer conveying path can be formed without being separated from the peripheral surface of the cylindrical member, the developer can be smoothly conveyed.

Further, since the output terminal of the recording signal applying element in the recording electrode driving means is used as the recording electrode, the step of connecting the recording electrode and the recording electrode driving means can be omitted, and the recording electrode is incorporated in the IC. In addition, the recording electrode can be downsized and the density can be increased.

[0018]

【Example】

[First Embodiment] An embodiment of an image forming apparatus to which the present invention is applied will be described below with reference to the drawings. This embodiment will be described using a display device. FIG. 1 is a cross-sectional view around the developing area of the display device, and FIG. 2 is a cross-sectional explanatory view showing the structure of the recording medium.

First, the schematic configuration of the display device will be described with reference to FIG. In FIG. 1, reference numeral 1 denotes a recording electrode for applying a voltage to a developer according to image information, which is patterned and arranged on a rigid substrate 2.
The recording electrode 1 is driven by a signal voltage applying IC 3 provided on the rigid substrate 2 to apply a signal voltage according to image information. The recording electrode 1 is provided with a conductor exposed portion 1a which exposes a conductor portion at the tip portion and contributes to recording. Reference numeral 4 denotes a circuit board which constitutes a recording electrode driving means, and a circuit component 5 for driving the recording electrode 1 such as a connector, a resistor and a capacitor is mounted on the circuit board 4.

Reference numeral 6 denotes a non-magnetic cylindrical member (hereinafter referred to as "sleeve") which constitutes a developer transport means, and is fixed in a developing container (not shown). As the sleeve 6,
Stainless steel pipe, aluminum pipe, resin pipe, etc. are used. Further, on the peripheral surface of the sleeve 6, flat surface portions 6a and 6b adjacent to each other by cutting a part of the peripheral surface for fixing the rigid substrate 2 and the circuit board 4 are formed at a predetermined angle. The rigid board 2 and the circuit board 4 fixed to 6a and 6b are connected by wire bonding described later.

The mounting operation of the rigid board 2 and the circuit board 4 will be described. First, the rigid board 2 on which the recording electrode 1 and the signal voltage application IC 3 are mounted and the circuit board 4 on which the circuit component 5 is mounted are respectively placed on the plane of the sleeve 6. After fixing to the portions 6a and 6b, each sleeve 6 is set in a bonding device, and the recording electrode 1 and the signal voltage applying IC3 and the signal voltage applying IC3 and the circuit board 4 are connected while adjusting the angle as necessary. The terminals are connected by wire bonding, and then the signal voltage applying IC 3, the wire 8 and the circuit component 5 are covered and protected by the sealing resin 7 to be mounted.

The sleeve 6 contains a rotating magnet 9 capable of rotating in the clockwise direction, and the rotating magnetic field formed by the rotating magnet 9 causes the conductive magnetic toner, which is a developer, to develop on the peripheral surface of the sleeve 6. 10 is conveyed counterclockwise.

The toner 10 is composed of acrylic resin,
After internally adding magnetic powder such as 70% ferrite (weight ratio),
It is a particle having an average particle size of about 10 μm to which 10% of carbon (weight ratio) is externally added, and the electric resistance value is a volume resistance value in the toner connecting direction when the toner 10 is formed into a chain with a magnetic brush.
The one with ⁸ Ωcm was used.

An endless belt-shaped recording sheet 11 which is a recording medium for adhering toner 10 to form an image is arranged in the vicinity of the recording electrode 1 so that a part thereof faces the exposed conductor portion 1a. Has been done. The recording sheet 7 is wound around a pair of upper and lower conveying rollers 12 which are conveying means, and is rotationally driven by a drive motor (not shown) to move the recording sheet 11 in the direction of arrow A in FIG. It is to be transported to.

The recording sheet 11 is, as shown in FIG.
It has a 4-layer structure, butyral resin (thickness: 5 μm, volume resistance value: 10 ⁹ Ωcm) as the surface layer 11a, white layer
11b is a plastic resin in which titanium oxide is dispersed (thickness: 10 μm, volume resistance value: 10 Ωcm), conductive layer 11c
An aluminum vapor deposition film (thickness: 800 Å, volume resistance value: 10 ² Ωcm) was used as the base material, and a polyethylene terephthalate resin (thickness: 70 μm) was used as the base material 11d.

After a signal voltage is applied to the recording electrode 1 according to image information and the toner 10 adhered to the recording sheet 11 by electrostatic force passes through an image display section (not shown) made of glass to display an image. , And again conveyed into the developing container. Then, the toner 10 is rubbed by a cleaning member (not shown), scraped off into the developing container, and conveyed again by the sleeve 6 to prepare for the next image formation.

According to the above structure, the rigid substrate 2 having the recording electrode 1 and the recording signal applying IC 3 and the circuit substrate 4 having the circuit component 5 mounted thereon are divided and arranged on the sleeve 6, and the rigid substrate 2 and the circuit are arranged. By connecting to the substrate 4 by wire bonding, it is possible to arrange the recording signal applying IC 3 and the circuit substrate 4 on the sleeve 6 having a small diameter without miniaturizing the device. Since the transporting path of the toner is not separated from the surface of the sleeve, the magnetic force does not sufficiently act to reduce the transportability of the toner.

[Second Embodiment] Next, a second embodiment of the recording electrode will be described with reference to FIG. The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In this embodiment, a flexible printed circuit board 14 for a drive circuit is mounted on a support substrate 13 instead of the circuit board 4 in the first embodiment. A connection terminal is exposed at the end of the flexible printed circuit board 14 for the drive circuit on the side of the rigid substrate 2, and is connected to the connection terminal of the rigid substrate 2 via an anisotropic conductive film 15. The anisotropic conductive film 15
Is required to apply pressure in order to improve the electrical connection. In this embodiment, the resin rod 16 having elasticity is placed on the upper surface of the flexible printed circuit board 14 for the drive circuit, and the protective plate is further provided thereon. Sufficient pressure is obtained by pressing 17 with a screw.

According to the above construction, the angle formed by the rigid board 2 and the circuit board 4 shown in the first embodiment becomes too acute,
It can be preferably used when the wiring distance of the wire 8 becomes long and the bonding strength becomes insufficient. Specifically, it becomes possible to fix each substrate to the sleeve 6 having a large curvature, and it is possible to downsize the device. It becomes possible to correspond.

[Third Embodiment] Next, a third embodiment of the recording electrode will be described with reference to FIG. The same members as those in the second embodiment are designated by the same reference numerals and the description thereof will be omitted. This embodiment relates to an improvement of the second embodiment, in which a circuit board 4 on which the same circuit component 5 as that of the first embodiment is mounted is used as a recording electrode driving means, and the connecting terminal portion of the circuit board 4 and the rigid board 2 are used.
The flexible printed board 18 for connection and the anisotropic conductive film 15 are used to electrically connect the connection terminal portions of the same as in the second embodiment.

In each of the above embodiments, the recording electrode 1
Also, the circuit board 4 and the like for driving the same are divided into two boards and arranged on the sleeve 6, but it is also possible to divide and arrange into three or more boards.

[Fourth Embodiment] Next, a fourth embodiment of the recording electrode will be described with reference to FIGS. The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In this embodiment, the output terminal of the IC chip, which is a recording signal applying element, is used as the recording electrode.
That is, as shown in FIG. 5, on the IC chip 19, the shift register portion 19a, the shift register portion 19a,
Latch circuit portion 19b, buffer amplifier portion 19c, electrode portion 19d
Are formed. FIG. 6 shows a recording electrode 20 formed by using the IC chip 19 described above. The recording electrode 20 has the IC chip 19 and other circuit components 20b mounted on a circuit board 20a.

FIG. 7 shows a state in which the recording electrode 20 is attached to the sleeve 6. The circuit board 20 is fixed to the flat surface portion 6a of the sleeve 6, and the shift register portion 19 is also provided.
A, the latch circuit portion 19b, the buffer amplifier portion 19c, and the circuit component 20b are covered and protected by the sealing resin 21.

According to the above construction, by incorporating the electrode portion 19d into the IC chip 19, the length of the recording electrode 20 in the circumferential direction can be greatly shortened as compared with the conventional case, and the transportability of the toner 10 can be improved. Able to make smaller sleeve 6
It is also possible to fix the device to the above, and it is possible to promote the miniaturization of the device. Further, since the step of connecting the recording electrode and the driving element can be omitted, the production efficiency can be improved, and since an extra substrate and a supporting member are unnecessary, the number of parts can be reduced and the cost can be reduced. Can be planned. Furthermore, since the semiconductor manufacturing process is used as it is for manufacturing the recording electrode 20, it is possible to form a recording electrode having a higher density than that of forming the electrode on the rigid substrate.

[Fifth Embodiment] Next, a fifth embodiment of the recording electrode will be described with reference to FIG. The same members as those in the fourth embodiment are designated by the same reference numerals and the description thereof will be omitted. This embodiment relates to an improvement of the recording electrode 20 shown in the fourth embodiment, and does not use the circuit board 20a as in the fourth embodiment, and the flat surface portion 6 of the sleeve 6 having the wiring pattern formed thereon.
IC chip 19 with the electrode part 19d built in a and other circuit parts
20b is directly mounted and covered with the sealing resin 21.

According to the above construction, the circuit board 20a can be omitted, the number of parts can be further reduced, the manufacturing process can be simplified, and the cost can be reduced. Further, since the electrode portion 19d is closer to the rotary magnet 9, an image can be formed by a stronger magnetic force on the electrode portion 19d, the image quality can be improved and the assembling accuracy can be relaxed.

[Sixth Embodiment] Next, a sixth embodiment of the recording electrode will be described with reference to FIG. The same members as those in the fourth embodiment are designated by the same reference numerals and the description thereof will be omitted. This embodiment relates to an improvement of the recording electrode 20 shown in the fourth embodiment, in which the circuit pattern portion and the output terminal portion are alternately arranged on the IC chip 19 according to the pixel pitch required for recording. .. That is, as shown in FIG. 9, the shift register section 19a, the latch circuit section 19b, and the buffer amplifier section 19c.
And electrode portions 19d are alternately arranged in a line shape to perform a pattern layout.

Generally, an IC chip having an electrode portion 19d built therein
In the case of 19, the output terminal portion tends to be larger than the circuit pattern portion. In order to increase the degree of integration, the circuit pattern portion having the shift register portion 19a, the latch circuit portion 19b, and the buffer amplifier portion 19c is formed in the unit of μm, while the electrode portion 19d supplies the electric charge to the toner 10. This is because a length in mm is required for this purpose. Therefore, when the circuit pattern portion and the output terminal portion are separately arranged as shown in FIG. 5, a blank area is generated in the space between the electrode rows. Therefore, in the present embodiment, the circuit pattern is formed in the space between the electrode rows to improve the degree of integration and promote miniaturization of the IC chip 19. The degree of integration of the IC chip 19 in this embodiment mainly depends on the resolution and the electrode length, and the higher the electrode pitch, the more advantageous it becomes. For example, if the current semiconductor process technology is used and the electrode length is 3 mm, the resolution is 600 DPI.
The above IC chip 19 can be created.

[Seventh Embodiment] Next, a seventh embodiment of the recording electrode will be described with reference to FIG. In this embodiment, the sixth
The present invention relates to the improvement of the recording electrode shown in the embodiment, and the recording electrode having a higher density is produced by adopting the multilayer wiring structure. That is, the electrode portion which is the output terminal portion of the IC chip is formed on the circuit pattern portion having the shift register portion, the latch circuit portion, and the buffer amplifier portion with the insulating layer interposed therebetween.

In FIG. 10, the IC chip 22 has a circuit pattern forming region 22b having a shift register portion, a latch circuit portion, and a buffer amplifier portion on a silicon substrate 22a, and an interlayer insulating film 22c is deposited on the surface thereof. An electrode portion 22d is formed thereon, and the surface thereof is coated with a nickel thin film 22e. As a result, the electrode surface is protected and the magnetic flux is concentrated, and the durability and resolution of the electrode can be improved. In addition, a part of the interlayer insulating film 22c is
Through holes 22f are formed, the circuit pattern forming region 22b and the electrode portions 22d are electrically connected, and aluminum is used as the material of the electrode portions 22d.

According to the above construction, by arranging the circuit pattern portion and the output terminal portion in three dimensions, the degree of integration of the IC chip 22 can be increased, which is at least double that of the IC chip 19 shown in FIG. It is possible to realize a recording electrode having a high density.

[0042]

According to the present invention, as described above, the recording electrodes and the recording electrode driving means are separately mounted on a plurality of rigid substrates,
By arranging each rigid board fixedly on the cylindrical member and electrically connecting them, it is possible to arrange it on a small-diameter cylindrical member without miniaturizing the recording signal application element, circuit board, etc. It becomes possible to cope with the change. Further, since the developer can be smoothly transported without being separated from the peripheral surface of the cylindrical member, the developer transportability can be improved. Also, by setting the tip of the recording electrode to a position where the magnetic force is stronger, the recording density and resolution can be improved, and the distance between the recording electrode and the recording medium can be increased, improving durability, performance, and mass productivity. It is possible to improve and reduce the manufacturing cost. Further, by using the output terminal of the recording signal applying element in the recording electrode driving means as the recording electrode, the step of connecting the recording electrode and the recording electrode driving means can be omitted, and by incorporating the electrode portion inside the IC, the recording electrode It is possible to realize downsizing and high density, and it is possible to realize a device with improved performance and mass productivity at low cost. Further, by arranging the circuit pattern portion and the output terminal portion of the recording signal applying element alternately according to the pixel pitch required for recording, an IC with a high degree of integration can be obtained. Further, by forming the output terminal portion of the recording signal applying element on the circuit pattern portion via the insulating layer, the integration degree of the IC can be more than doubled, and the recording electrode can be made smaller and higher in density. Can be promoted.

[Brief description of drawings]

FIG. 1 is a cross-sectional view around a developing area of a display device.

FIG. 2 is a cross-sectional explanatory diagram showing a configuration of a recording medium.

FIG. 3 is an explanatory diagram showing a configuration of a recording electrode peripheral portion according to a second example.

FIG. 4 is an explanatory diagram showing a configuration of a recording electrode peripheral portion according to a third embodiment.

FIG. 5 is a plan view of an IC chip according to a fourth embodiment.

FIG. 6 is a perspective view of a recording electrode according to a fourth embodiment.

FIG. 7 is a cross-sectional view around a developing area of a display device according to a fourth embodiment.

FIG. 8 is a sectional view around a developing area of a display device according to a fifth exemplary embodiment.

FIG. 9 is a plan view of an IC chip according to a sixth embodiment.

FIG. 10 is a cross-sectional view of an IC chip according to a seventh embodiment.

FIG. 11 is a sectional explanatory view showing a conventional image forming principle.

FIG. 12 is a cross-sectional explanatory view showing a conventional image forming apparatus.

FIG. 13 is a perspective view showing a configuration of a conventional recording electrode section.

FIG. 14 is a perspective view showing a configuration of a conventional recording electrode section.

FIG. 15 is an explanatory diagram showing a conventional mounting configuration of recording electrodes.

[Explanation of symbols]

 1, 20 ... Recording electrode 1a ... Conductor exposed portion 2 ... Rigid substrate 3 ... Signal voltage application IC 4, 20a ... Circuit board 5, 20b ... Circuit component 6 ... Sleeves 6a, 6b ... Plane portion 7, 21 ... Sealing Resin 8 ... Wire 9 ... Rotating magnet 10 ... Toner 11 ... Recording sheet 11a ... Surface layer 11b ... White layer 11c ... Conductive layer 11d ... Base material 12 ... Conveying roller 13 ... Support substrate 14 ... Flexible printed circuit board 15 for drive circuit ... Different Directional conductive film 16 ... Resin rod 17 ... Protective plate 18 ... Flexible printed circuit board for connection 19, 22 ... IC chip 19a ... Shift register section 19b ... Latch circuit section 19c ... Buffer amplifier section 19d, 22d ... Electrode section 22a ... Silicon substrate 22b ... Circuit pattern forming area 22c ... Interlayer insulating film 22e ... Nickel thin film 22f ... Through hole

Claims (8)

[Claims] 1. A plurality of recording electrodes, a recording electrode driving unit for applying a recording signal to the recording electrodes, and a movable recording medium for forming an image by attaching a developer by the recording electrodes. And a developer supplying unit having a cylindrical member for supplying a developer between the recording electrode and the recording medium, and the recording electrode and the recording electrode driving unit are separately mounted on a plurality of rigid substrates. The rigid substrate is fixedly arranged on the cylindrical member and electrically connected to each other. 2. A plurality of recording electrodes, a recording electrode driving means for applying a recording signal to the recording electrodes, and a movable recording medium for forming an image by attaching a developer by the recording electrodes. And a developer supplying unit having a cylindrical member for supplying a developer between the recording electrode and the recording medium, and the recording electrode and the recording electrode driving unit are separately mounted on a plurality of rigid substrates. An image forming apparatus is characterized in that each rigid substrate is fixedly arranged on a cylindrical member and they are connected by wire bonding. 3. A plurality of recording electrodes, a recording electrode driving means for applying a recording signal to the recording electrodes, and a movable recording medium for forming an image by attaching a developer by the recording electrodes. And a developer supplying unit having a cylindrical member for supplying a developer between the recording electrode and the recording medium, and the recording electrode and the recording electrode driving unit are separately mounted on a plurality of rigid substrates. Then, each rigid substrate is fixedly arranged on the cylindrical member, and these are connected to each other using a flexible printed substrate and an anisotropic conductive film. 4. A plurality of recording electrodes, a recording electrode driving unit for applying a recording signal to the recording electrodes, and a movable recording medium for forming an image by attaching a developer by the recording electrodes. And a developer supplying unit for supplying a developer between the recording electrode and the recording medium, wherein the output terminal of the recording signal applying element in the recording electrode driving unit is used as the recording electrode. A characteristic image forming apparatus. 5. The image forming apparatus according to claim 4, wherein the circuit pattern portion and the output terminal portion of the recording signal applying element are alternately arranged in accordance with a pixel pitch required for recording. 6. The image forming apparatus according to claim 4, wherein the output terminal portion of the recording signal applying element is formed on the circuit pattern portion via an insulating layer. 7. The image forming apparatus according to claim 1, wherein the recording medium is formed by laminating a conductive layer, a white layer, and a surface layer on a base material. 8. The image forming apparatus according to claim 7, wherein the image formed on the recording medium is a display device which is used by being displayed on a display unit.