JPH08171256A - Corona discharging device - Google Patents

Abstract

PURPOSE: To simplify maintenance work such as cleaning or replacing a discharge electrode part by arranging an integrated electrode at a specified distance from a photoreceptor and providing the electrode so that it can be attached to/detached from an insulating supporting body having elasticity. CONSTITUTION: The stainless tooth-shaped discharge electrode 8a is disposed on the insulating substrate 8b. A common electrode 8h is installed on an opposite side to the electrode 8a on the substrate 8b. By attaching a common electrode projected part 8i to the center of a chip resistance 8c knocked in the electrode 8a in a shape functioning as positioning, the electrode 8a is fixed Then, the electrode 8a is fixed. The electrode 8a is mounted on the substrate 8b so that its addendum may be positioned to be projected to a photoreceptor side from the edge part of the substrate 8b. The common electrode 8h is connected to a high voltage power source, and high voltage is impressed on the electrode 8h by the high voltage power source, thereby generating corona discharge from the addendum and electrifying the surface of the photoreceptor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corona discharge device for uniformly charging an object to be charged by utilizing a corona discharge phenomenon,
More specifically, by using a corona discharge device having a plurality of discharge members, a resistor connected to each discharge member, and a voltage source connected to the resistor, stable discharge can be performed with a smaller discharge current. The present invention relates to a corona discharge device capable of being generated, generating less ozone, and being capable of uniform charging.

[0002]

2. Description of the Related Art In an image forming apparatus for forming an image by an electrophotographic method, a tungsten wire having a diameter of 50 to 100 .mu.m and a high voltage of 5 to 10 kv is used as a charging device for supplying a predetermined charging potential to the surface of an image forming body. There is known a corona discharge device that applies and moves the ions generated by the discharge on the wire to the surface of the image forming body for charging. When this method is used for negative discharge, the discharge points are randomly positioned on the wire depending on the state of the wire surface, and the discharge is unstable and non-uniform with respect to the surface to be charged, so the charged surface is uniformly charged. Therefore, a shield case as an auxiliary electrode and a grid for potential control are used. However, this method requires a large amount of discharge current in order to stabilize discharge and uniform charge, and as a result, a large amount of ozone is generated, leading to deterioration of image quality and adverse effects on the human body. is there.

In recent years, for example, Japanese Patent Laid-Open No. 63-1527.
As disclosed in Japanese Patent Laid-Open No. 2 (1994), a corona discharge device using a sawtooth discharge electrode instead of a tungsten wire has been proposed. This type of corona discharge device has more uniform discharge on the surface to be charged because the discharge points are regularly located at the sawtooth tip, and it has significant structural and operational advantages over the wire type. However, the discharge current required for uniform charging is small, the structural strength is relatively high, and the amount of undesired ozone generation is small.

However, on the other hand, there are drawbacks that the supporting means for the sawtooth electrode becomes complicated and the tooth tips of the sawtooth electrode are easily damaged. Therefore, for example, JP-A-63-16
As disclosed in Japanese Patent No. 7382, there is proposed a system in which a discharge resistance and a discharge electrode are formed on an insulating corona-resistant substrate. In this method, since the discharge electrodes and the like are fixed on the insulating substrate, it is easy to mount the discharge electrode in the corona discharge device. It has the advantage of being protected by the substrate and not easily damaged.

FIG. 14 is a block diagram of a conventional corona discharge electrode, in which 21 is a sawtooth discharge electrode, 22 is an insulating substrate,
Reference numeral 23 is a counter electrode, and 24 is a high-voltage power supply. Insulating substrate 2
A sawtooth discharge electrode 21 made of stainless steel is attached to the upper part of the electrode 2. The number of teeth of the sawtooth discharge electrode 21 is 10, and the pitch between the teeth is 2 mm. A counter electrode 23 made of stainless steel is fixed so as to face the saw-tooth discharge electrode 21 with a constant gap g from the tooth tip of the saw-tooth discharge electrode 21.
A high voltage power supply 24 is connected to the sawtooth discharge electrode 21, and a high voltage is applied to the sawtooth discharge electrode 21 to generate corona discharge to the counter electrode 23. The discharge current flowing through each electrode during this corona discharge was measured by an ammeter connected in series between the sawtooth discharge electrode 21 and the high voltage power supply 24. FIG. 15 shows the discharge current of each electrode when the applied voltage is −4.3 kV and the interval g = 7 mm.

As described above, although the discharges occur at substantially equal intervals, the discharge amount (discharge current) varies and fluctuations are large, resulting in unstable discharge. As one of the solutions to this problem, it is known to stabilize the current flowing through each of the electrode members by connecting each of the electrode members to a power supply via a separate resistor. In order to solve this point, for example, Japanese Patent Publication No. 3-1663 is proposed.

[0007]

As described above, in the conventional corona discharge device, since the discharge point is specified, the tooth tip of the serrated electrode is damaged or the floating matter is attached to the tip of the electrode.
The electrode itself is easily affected by the tilt of the electrode and the discharge itself is unstable. To stabilize the discharge, a discharge current several times to several tens of times the actual charge amount must be applied, and However, even if there is an insufficient electrode, the pitch of the tooth tip must be made small to prevent charging failure, resulting in a large amount of ozone, which is a problem similar to the wire method.

Further, in order to form the discharge electrode and the discharge resistance on the ceramic substrate, a thick film printed circuit technology such as firing the electrode pattern and the resistance after thick film printing is used, so that the manufacturing process is complicated and expensive. It will be something like.

Further, since it is necessary to use a large number of resistors, the corona discharge device becomes complicated, the material cost is considerably increased, and the manufacturing is difficult. As disclosed in Japanese Patent Publication No. 3-1663 mentioned above, it has been proposed to simplify a device by placing a space instead of via a resistor and utilizing a voltage drop due to discharge in the space. However, the discharge in the space is unstable and is easily affected by the environment.

After all, there has been no corona discharge device which can generate stable discharge with a small discharge current, generate little ozone, can uniformly store electricity, and is easy to assemble. there were.

[0011]

According to another aspect of the present invention, there is provided a corona discharge device having a plurality of non-circular through holes, each of which has a through hole having the same shape as the through hole. The plurality of discharge electrodes having the through holes are arranged so that the through holes overlap with each other, the plurality of resistors having the through holes which are the first supporting members are fitted into the plurality of through holes, and A corona discharge device is characterized in that a conductor, which is a second support member, having a plurality of protrusions corresponding to the through holes of the resistor is fitted therein.

A corona discharge device according to a second aspect of the present invention is characterized in that, when the first member and the second member are fastened, the second member is fused by using a conductive resin. It is a device.

A corona discharge device according to a third aspect of the present invention is a corona discharge device for applying a voltage to the tips of a plurality of discharge electrodes, wherein the discharge electrodes are fitted to a hollow resistor, and the tips are provided. The corona discharge device is characterized in that only the part is exposed.

According to a fourth aspect of the present invention, the corona discharge device according to the third aspect is characterized in that the discharge electrode is fitted on the resistor and integrated with each other, and then is assembled to the insulating support. It is a device.

According to a fifth aspect of the present invention, a corona discharge device is an electrode in which a base made of a conductor and a high resistance resin, a plurality of independent discharge electrodes embedded in the base, and an insulating support are integrated. At the same time, the corona discharge device is characterized in that the integrated electrode is detachably provided on an insulating support having an elastic force, which is arranged at a predetermined distance from the photoconductor.

[0016]

According to the structure of claim 1, the discharge electrode and the insulating support are supported by the first member and the second member, the first member is a resistor, and the second member is A conductor, which is commonly connected to a plurality of discharge electrodes, has the same sectional shape of the first member and the second member, and the same shape as the through hole of the discharge electrode and the support, The discharge electrodes can be structurally stabilized because the shapes of the common electrodes, the resistors, and the fitting portions of the discharge electrode group are non-circular, as well as the shapes of the discharge electrodes.

According to the second aspect of the present invention, the method of locking the first member and the second member uses the conductive resin for the second member, so that the discharge electrode is structurally stable. Can be made.

According to the third aspect of the present invention, in the charging device that applies a voltage to each of the plurality of discharge tips to perform corona discharge, the discharge electrode is driven into each resistor, so that the discharge electrode is structured. Can be stabilized.

According to a fourth aspect of the present invention, the discharge electrode is formed in a comb tooth shape, and the one formed by engaging with the resistor also formed in the comb tooth shape is used as a constituent member. Positioning can be facilitated by dividing the electrodes into independent discharge electrodes.

According to a fifth aspect of the present invention, a base body made of a conductor and a high resistance resin, a plurality of independent discharge electrodes embedded in the base body, and an insulating support body are integrated into an electrode, and Since the integrated electrode is placed at a predetermined distance from the photoconductor and is detachably attached to the elastic insulating support, maintenance work such as cleaning and replacement of the discharge electrode is simplified. Can be converted.

[0021]

【Example】

(Embodiment 1) An embodiment of the present invention will be described with reference to FIGS. 1 to 6 and 9.

FIG. 1 is a block diagram of an electrophotographic apparatus such as a copying machine or a laser printer using the corona discharge device according to the present invention, in which 1 is an image forming body (photoreceptor), 2 is an exposure direction, and 3 is an exposure direction. Is a developing device, 4 is a transfer material, 5 is a fixing device, 6 is a cleaner, 7 is a discharge lamp, 8 is a corona discharge device (charger),
8a is a sawtooth discharge electrode, 8b is an insulating substrate, 8c is a chip resistor, 8d is a shield case, 8e is a grid electrode,
8f and 8g are high-voltage power supplies, 9 is a corona discharge device (transfer device), 9a is a sawtooth discharge electrode, 9b is an insulating substrate, and 9c.
Is a chip resistor, 9d is a shield case, and 9e is a high-voltage power supply.

The photosensitive member 1 has an axis line in the direction perpendicular to the paper surface, and the photosensitive member 1 rotatably supports a drum-shaped base body made of a conductive material such as aluminum, and OPC (Orga) is provided on the peripheral surface of the base body.
and an organic photoconductive layer made of nic photoconductor or the like. The photoconductor 1 is configured to be rotationally driven in the direction of the arrow A shown, and a corona discharge device (charger) 8 and a corona discharge device (transfer device) 9 are closely opposed to the photoconductor 1. There is. Charger 8
Is made of stainless steel (thickness 0.1 m on the insulating substrate 8b).
m) The sawtooth discharge electrode 8a is disposed and is supported in the U-shaped shield case 8d in cross section. A common electrode is attached to the insulating substrate 8b, and is connected to the sawtooth discharge electrode 8a via a chip resistor 8c.

FIG. 3 is a block diagram for explaining a corona discharge device according to the present invention, in which 10 is a sawtooth discharge electrode,
11 is an insulating substrate, 12 is a counter electrode, 13 is a high voltage power supply,
Reference numeral 14 is a resistor. The insulating substrate 11 is made of PET, AB
Materials such as S and polycarbonate that are insulating and are not easily affected by heat are used. The resistor 14 is made of an organic material such as polyethylene, polyester, polyurethane, nylon, polyamide, or polyimide, and is made of carbon black or metal powder, and is an inorganic material or zinc oxide, ruthenium oxide, or the like, which forms an inexpensive resistor. A metal oxide forming a high-resistor with stable performance even when temperature and humidity change, or a uniform resistor such as halogen oxyacid salt, perhalogen oxyacid salt, lithium perchlorate, etc. with little local resistance change Additives such as an alkali metal salt showing ionic conductivity that form the above are kneaded to obtain a predetermined electric resistance. As the resistance value, it is desirable that the resistance value is about 100 MΩ or more so that a voltage drop of several hundreds V occurs in the resistor for stabilizing the discharge characteristic.

A sawtooth discharge electrode 10 made of stainless steel is provided on an insulating substrate 11. The sawtooth discharge electrode 10
The number of teeth is 10 and the pitch between each tooth is 2 mm. A counter electrode 12 made of stainless steel is fixed so as to face the saw-toothed discharge electrode 10 with a constant gap g from the tooth tip of the saw-toothed discharge electrode 10. A high voltage power supply 13 is connected to the sawtooth discharge electrode 10, and the sawtooth discharge electrode 10 is connected.
A corona discharge is generated on the counter electrode 12 by applying a high voltage to the counter electrode 12. Each discharge electrode is connected to a high voltage power supply 13 via a resistor 14 of 500 MΩ.

In the experimental apparatus shown in FIG. 3, the resistance value is 10M,
50M, 100M, 500M, 1G, 5GΩ and normalized standard deviation of the discharge current and the discharge current at each pin resistor when the discharge current is changed to about 0.1, 0.5, 1.0μA per pin. The relationship shown in FIG. When the potential drop across the resistor is 200 V or more, the variation in the discharge current is reduced and the discharge is stabilized. However, when the potential drop in the resistor is large, the applied voltage is increased and the power consumption is increased, resulting in a large amount of ozone generation.
A potential drop of 00V is suitable. The potential drop in the resistor to reduce variations in discharge current depends on variations in discharge conditions such as the state of the electrodes and the environment, but the results of this experiment show that it was produced accurately by etching etc. and that there is no history. It is the result of using it at room temperature, considering the deterioration, damage, adhesion of foreign matter, environmental change etc. of the electrode due to long-term use,
Preferably, if there is a potential drop of about 500 V, variations in the previous discharge conditions can be absorbed, and stable discharge can be obtained.

FIG. 15 shows the discharge current of each electrode when the experimental apparatus having the structure shown in FIG. 14 was discharged at an applied voltage of −4.78 KV and an interval g = 7 mm. As described above, in the conventional corona discharge electrode, the discharge amount at each electrode is unstable. Similarly, applied voltage −4.78 KV, interval g = 7
FIG. 4 shows the discharge current of each electrode according to the present invention when discharged in mm. The discharge amount at each electrode was very stable, and good discharge characteristics were obtained.

FIGS. 5 (A) and 5 (B) are an enlarged view of a main part of the sawtooth discharge electrode in FIG. 3 and a side view showing the structure for explaining the first embodiment of the present invention. In the figure, 8a is a sawtooth discharge electrode, 8b is an insulating substrate, 8c is a chip resistor, 8h is a common electrode, 8i is a common electrode convex portion, and other parts having the same functions as those in FIG. I am doing it. A sawtooth discharge electrode 8a made of stainless steel is arranged on the insulating substrate 8b. The insulating substrate 8b is provided with a common electrode 8h on the opposite side of the sawtooth discharge electrode 8a, and the common electrode 8h is attached to the center of the chip resistor 8c which is driven into the sawtooth discharge electrode 8a in a shape also serving as positioning. The sawtooth discharge electrode 8a is fixed by providing the common electrode protrusion 8i. The number of teeth of the discharge electrode 8a is 52, the pitch between the teeth is 4 mm, and the tip of the tooth is located on the insulating substrate 8b so that the tip of the tooth protrudes from the edge portion of the insulating substrate 8b toward the photoreceptor 1. Is glued to. The common electrode 8h is connected to a high voltage power source 8f, and by applying a high voltage from the high voltage power source 8f, corona discharge is generated from the tooth tips and the surface of the photoconductor 1 is charged. Discharge electrode 8a and photoconductor 1
A grid electrode 8e to which a voltage of about -720V is applied by a high-voltage power supply 8g is disposed between them to control the charging potential of the photoconductor 1 to a predetermined potential (-700V). After the surface of the photoconductor 1 is charged to a predetermined potential by the charging device 8, an electrostatic latent image is formed on the surface of the photoconductor 1 by exposure 2, and the electrostatic latent image is developed by the developing device 3.

Next, when this toner image reaches the transfer portion where the corona discharge device (transfer device) 9 and the photosensitive member 1 face each other, the transfer material 4 is supplied to the transfer portion at the same timing (in FIG. 1). Arrow B direction). At the transfer site, the back surface of the transfer material 4 is charged by a transfer device 9 similar to the charging device 8 except that there is no grid electrode, and the toner image on the photoconductor is transferred to the transfer material 4. Thereafter, the transfer material 4 carrying the toner image is conveyed to the fixing device 5, while the toner remaining on the photoconductor 1 is collected by the cleaner 6, and the residual charge on the photoconductor 1 is removed by the charge eliminating lamp 7. Enter the next step.

FIG. 9 is a block diagram showing the shapes of the resistor, the discharge electrode, and the common electrode, and the steps for driving the resistor into the discharge electrode. The reference numerals in the figure are those in FIGS. 5 (A) and 5 (B). It is the same. A sawtooth discharge electrode 8a made by etching or laser processing is superposed on the insulating substrate 8b, and further the resistor 8c is superposed on the sawtooth discharge electrode 8a. After sandwiching the sawtooth discharge electrode 8a and the insulating substrate 8b, the sawtooth discharge electrode 8a is pressure-bonded or thermocompression-bonded from above. After the insulating substrate 8b, the resistor 8c, and the discharge electrode 8a are securely pressure-bonded to each other, they are broken at a crease that is half-etched or half-laser processed. In this state, the resistance value between the adjacent discharge electrodes is 1 * 10 ¹² Ω or more when 100 V is applied, and the resistance value between the discharge electrode and the common electrode is approximately 1 * 10 ⁹ Ω when 500 V is applied. The common electrode 8h is connected to a high-voltage power supply, and by applying a high voltage from the high-voltage power supply, corona discharge is generated from the tooth tips and the surface of the photoconductor is charged.

FIGS. 6A and 6B are side views showing another method of joining the common electrode protrusions in FIG.
a is a sawtooth discharge electrode, 8b is an insulating substrate, 8c is a chip resistor, 8h is a common electrode, 8i is a common electrode convex portion, and 8j.
Is a conductive resin or a conductive adhesive.

When the common electrode protrusion 8i is attached to the center of the chip resistor 8c which is driven into the sawtooth discharge electrode 8a in a shape also serving as a positioning, FIG. 6A shows that the electrode material is relatively soft (gold). , Silver, copper, aluminum, brass, tin, etc.), the common electrode convex portion is crushed like rivet bonding. In FIG. 6B, the material of the electrode is relatively hard (SU
In the case of S, iron, chromium, nickel, etc.), since it is difficult to crush like a soft material, they are bonded via a conductive adhesive. In FIG. 6C, when the material of the electrodes is a conductive resin, the electrodes are joined by fusing the resin.

(Embodiment 2) Another embodiment of the present invention is shown in FIG.
A description will be given based on FIG.

FIG. 7 is a block diagram showing another embodiment of the sawtooth discharge electrode in FIG. 5, in which 8a is a sawtooth discharge electrode, 8b is an insulating substrate, 8c is a chip resistor, and 8h is a common electrode. Is. A sawtooth discharge electrode 8a made of stainless steel and a chip resistor 8c are arranged on an insulating substrate 8b. The sawtooth discharge electrode 8a and the chip resistor 8c are integrated by driving the sawtooth discharge electrode 8a into the chip resistor 8c, and a common electrode 8h is additionally provided on the chip resistor 8a. ing.

FIG. 10 is a configuration diagram showing the shapes of the resistor, the discharge electrode, and the common electrode and the steps for driving the discharge electrode into the resistor. The reference numerals in the figure are the same as those in FIG. A sawtooth discharge electrode 8a manufactured by etching or laser processing is driven into the center of the resistor 8c, and is superposed on the insulating substrate 8b, and then the sawtooth discharge electrode 8a.
Press or heat press from above. After the insulating substrate 8b, the resistor 8c, and the discharge electrode 8a are securely pressure-bonded to each other, they are broken at a crease that is half-etched or half-laser processed. In this state, the resistance value between the adjacent discharge electrodes is 100.
It is 1 * 10 ¹² Ω or more when V is applied, and the resistance value between the discharge electrode and the common electrode is approximately 1 * 10 ⁹ Ω when 500 V is applied. The common electrode 8h is connected to a high-voltage power supply, and by applying a high voltage from the high-voltage power supply, corona discharge is generated from the tooth tips and the surface of the photoconductor is charged.

(Embodiment 3) Another embodiment of the present invention is shown in FIG.
It will be described with reference to FIG.

FIG. 8 is a block diagram showing still another embodiment of the sawtooth discharge electrode in FIG. 5, in which 8a is a sawtooth discharge electrode, 8b is an insulating substrate, 8c is a chip resistor, and 8h is It is a common electrode. A sawtooth discharge electrode 8a made of stainless steel, a chip resistor 8c, and a common electrode 8h are arranged on an insulating substrate 8b. The sawtooth discharge electrode 8a, the chip resistor 8c, and the common electrode 8h are respectively the chip resistor 8c.
To the common electrode 8h and then to the sawtooth discharge electrode 8a to form an integral type.

FIG. 11 is a configuration diagram showing the shapes of the resistor, the discharge electrode, and the common electrode and the steps for driving the discharge electrode into the common electrode. The reference numerals in the figure are the same as those in FIG. A sawtooth discharge electrode 8a manufactured by etching, laser processing, or the like is driven into the center of the resistor 8c and further into the common electrode 8h. After being superposed on the insulating substrate 8b, pressure-bonding or thermo-compression bonding is performed on the saw-tooth discharge electrode 8a. After the insulating substrate 8b, the resistor 8c, and the discharge electrode 8a are securely pressure-bonded to each other, they are broken at the creases half-etched or half-laser processed. In this state, the resistance value between the adjacent discharge electrodes is 1 * when 100 V is applied.
And at 10 ¹² Omega or more, the resistance value between the discharge electrode and the common electrode is about 1 * 10 ⁹ Ω at 500V applied. The common electrode 8h is connected to a high voltage power source, and by applying a high voltage from the high voltage power source, corona discharge is generated from the tooth tips and the surface of the photoconductor is charged.

(Embodiment 4) Another embodiment of the present invention is shown in FIG.
2, it demonstrates based on FIG.

12 and 13 are configuration diagrams showing another embodiment of the sawtooth discharge electrode in FIG. 5, in which 8 in FIG.
a is a sawtooth discharge electrode, 8b is an insulating substrate, 8c is a chip resistor, 8h is a common electrode, and 8j is an elastic holder.

A sawtooth discharge electrode 8a made of stainless steel, a chip resistor 8c, and a common electrode 8h are arranged on an insulating substrate 8b. Serrated discharge electrode 8a, insulating substrate 8
b, the chip resistor 8c, and the common electrode 8h are superposed on each other, and then sandwiched by the elastic holder 8j so that they can be attached and detached during maintenance.

That is, in the embodiment, an electrode in which a base made of a conductor and a high resistance resin, a plurality of independent discharge electrodes embedded in the base, and an insulating support are integrated,
The integrated electrode is placed at a predetermined distance from the photoconductor and is detachably attached to the elastic insulating support, which simplifies maintenance work such as cleaning and replacement of the discharge electrode section. It is intended to be

[0043]

According to the invention described in claim 1, the discharge electrode and the insulating support are supported by the first member and the second member, the first member is the resistor, and the second member is the resistor. The member is a conductor and is commonly connected to a plurality of discharge electrodes, and the cross-sectional shape of the first member and the second member and the shape of the through hole of the discharge electrode and the support are the same. , The shape also serves as each positioning, and further, since the shape of the common electrode portion, the fitting portion of the resistor and the discharge electrode group is non-circular, the discharge electrode can be structurally stabilized,
A stable discharge can be obtained. Also, the assembly of the device is very simple.

According to the second aspect of the present invention, the method of engaging and locking the first member and the second member uses the conductive resin for the second member. It can be stabilized and stable discharge can be obtained. Furthermore, to reduce the cost compared to rivet joining,
It can also be expected to improve productivity. Further, since no adhesive is used, the cost can be reduced.

According to the third aspect of the invention, in a charging device that applies a voltage to each of a plurality of discharge tips to perform corona discharge, the discharge electrode is driven into each resistor, so that the discharge electrode is structured. Can be stabilized, and stable discharge can be obtained. Furthermore, by integrally molding the discharge electrode and the resistor, it is possible to stabilize the contact resistance and reduce variations, and thus more stable discharge can be obtained.

According to the fourth aspect of the present invention, the discharge electrode is formed in a comb shape, and a resistor formed in a comb shape is engaged with the discharge electrode as a constituent member. Since the electrode is divided into the independent discharge electrodes, the independent needle is firmly fixed, and the positioning of the independent needle can be facilitated even after cutting.

According to a fifth aspect of the present invention, a base body made of a conductor and a high resistance resin, a plurality of independent discharge electrodes embedded in the base body, and an insulating support are integrated into an electrode. Since the integrated electrode is arranged at a predetermined distance from the photoconductor and is detachably attached to the elastic insulating support, maintenance work such as cleaning and replacement of the discharge electrode part can be performed. It can be simplified.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an electrophotographic apparatus using a corona discharge device according to the present invention.

FIG. 2 is a diagram showing a relation between a normalized standard deviation between a potential drop and a discharge current in a resistor according to the present invention.

FIG. 3 is a configuration diagram for explaining a corona discharge device according to the present invention.

FIG. 4 is a diagram showing discharge characteristics of the sawtooth discharge electrode in FIG.

FIG. 5A is an enlarged view of a main part of a discharge electrode according to an embodiment of the present invention. (B) It is a side view of (A).

FIG. 6 (A) is a diagram showing a locking method (caulking) of the first member and the second member. (B) It is a figure showing the locking method (conductive adhesive) of a 1st member and a 2nd member. (C) It is a figure showing the locking method (electroconductive resin) of a 1st member and a 2nd member.

FIG. 7 is an enlarged view of a main part of a discharge electrode according to another embodiment of the present invention.

FIG. 8 is an enlarged view of a main part of a discharge electrode according to another embodiment of the present invention.

FIG. 9 is a diagram showing a manufacturing process of the discharge electrode in FIG.

10 is a diagram showing a manufacturing process of the discharge electrode of FIG. 7. FIG.

FIG. 11 is a diagram showing a manufacturing process of the discharge electrode in FIG. 8.

FIG. 12 is an enlarged view of a main part of a discharge electrode according to another embodiment of the present invention.

FIG. 13 is a diagram showing a manufacturing process of the discharge electrode in FIG.

FIG. 14 is a configuration diagram of a conventional corona discharge electrode.

15 is a diagram showing discharge characteristics of the sawtooth discharge electrode in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Image forming body (photoreceptor) 2 Exposure direction 3 Developing device 4 Transfer material 5 Fixing device 6 Cleaner 7 Eliminating lamp 8 Corona discharge device (charging device) 8a Sawtooth discharge electrode 8b Insulating substrate 8c Chip resistance 8d Shield case 8e Grid Electrode 8f High-voltage power supply 8g High-voltage power supply 8h Common electrode 8i Common electrode convex portion 8j Elastic holder 9 Corona discharge device (transfer device) 9a Sawtooth discharge electrode 9b Insulating substrate 9c Chip resistance 9d Shield case 9e High-voltage power supply 10 Sawtooth discharge electrode 11 Insulating substrate 12 Counter electrode 13 High voltage power supply 14 Resistor 21 Sawtooth discharge electrode 22 Insulating substrate 23 Counter electrode 24 High voltage power supply

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Seiko Uwakawa 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Within Sharp Corporation (72) Inventor Eisaku Hatanaka 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Osaka Incorporated (72) Inventor Katsuhiro Nagayama 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka

Claims (5)

[Claims] 1. A plurality of discharge electrodes each having one through-hole having the same shape as each of the through-holes in an insulating support having a plurality of non-circular through-holes so that the through-holes overlap each other. A plurality of resistors having a through hole which is a first supporting member is fitted into the plurality of through holes, and a plurality of protrusions corresponding to the through holes of the plurality of resistors are provided. A corona discharge device characterized by being fitted with a conductor which is a second supporting member. 2. A corona discharge device, characterized in that, when fastening the first member and the second member, the second member is fused using a conductive resin. 3. A corona discharge device for applying a voltage to the tips of a plurality of discharge electrodes, wherein the discharge electrodes are fitted in a hollow resistor, and only the tips are exposed. Characteristic corona discharge device. 4. The corona discharge device according to claim 3, wherein the discharge electrode is fitted and integrated with the resistor and then assembled to the insulating support. 5. A base made of a conductor and a high resistance resin,
A plurality of independent discharge electrodes embedded in the base and an insulating support are integrated with each other, and the integrated electrodes are arranged at a predetermined distance from the photosensitive member and have an elastic force. A corona discharge device, which is detachably attached to a flexible support.