Electrostatic film formation apparatus and electrostatic film formation method

Abstract

To provide a technology that can obtain high film-forming efficiency in an electrostatic film forming apparatus.SOLUTION: An electrostatic film forming apparatus includes a magnet roller having a magnetic pole, and attracting a carrier having magnetism to which electrode particles as a film forming material are attached by a magnetic force, and a backup roller spaced apart from the magnet roller, and having a film-forming surface on which the electrode particles separated from the carrier are formed, and inside the backup roller, a repelling magnetic pole member having a repelling magnetic pole that repels the magnetic pole of the magnet roller, and causing a change in the magnetic field in a flying region located between the magnet roller and the backup roller is provided.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to an electrostatic film formation apparatus and an electrostatic film formation method. [Background technology]

[0002] Conventionally, a technology has been known in which a developing device carries and conveys a developer on the surface of a developer carrier equipped with a magnet roller inside as a magnetic field generating means, thereby developing a toner image on the surface of a photosensitive drum facing the developer carrier (Patent Document 1). The developer comprises a toner and a magnetic carrier. In this technology, while the carrier is bound by the magnetic flux of the magnet roller, the frictionally charged toner is electrostatically bound to the carrier to form a magnetic brush. The magnetic brush is then brought into contact with the photosensitive drum to supply the toner to the photosensitive drum, thereby developing a toner image. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-129607 A Summary of the Invention [Problem to be solved by the invention]

[0004] As a technique for forming a film on an electrode used in a lithium ion battery or the like, for example, there is a wet film formation in which a paste containing electrode particles is applied to the surface of a strip-shaped metal foil and dried. The inventors of the present application have considered applying the technique of developing a toner image using a developing device equipped with a magnetic field generating means described in Patent Document 1 to the film formation of an electrode. When the technique described in Patent Document 1 is applied to the film formation of an electrode, it may be difficult for the electrode particles to be separated from the carrier, and a high film formation efficiency may not be obtained. Therefore, a technique is desired that can improve the film formation efficiency by making more electrode particles fly from the magnet roller. [Means for solving the problem]

[0005] The present disclosure can be realized in the following forms.

[0006] (1) According to one embodiment of the present disclosure, an electrostatic film forming apparatus is provided. The electrostatic film forming apparatus includes a magnet roller having a magnetic pole, which magnetically attracts a carrier having a magnetic property to which electrode particles, which are a film forming material, are attached, and a backup roller provided at a distance from the magnet roller, which has a film-forming surface on its surface on which the electrode particles separated from the carrier are formed. Inside the backup roller, a repulsive magnetic pole member is provided, which has a repulsive magnetic pole that repels the magnetic pole of the magnet roller, and which generates a magnetic field change in a flying area located between the magnet roller and the backup roller. According to this embodiment, a magnetic field change is generated in the flying area by the magnetic pole and the repulsive magnetic pole that repels the magnetic pole. Therefore, the carrier to which the electrode particles are attached can be vibrated by the magnetic field change. This vibration makes it easier to separate the electrode particles electrostatically bound to the carrier from the carrier, thereby improving the film forming efficiency. (2) In the above embodiment, the magnet roller may have a cylindrical member that attracts the carrier to which the electrode particles are attached, and a magnetic pole member that is provided inside the cylindrical member and has the magnetic pole, and the repulsive magnetic pole member may be configured to be rotatable so that the magnetic pole and the repulsive magnetic pole face each other periodically. According to this embodiment, the repulsive magnetic pole member may rotate periodically, thereby easily generating a change in the magnetic field. (3) In the above aspect, the number of times that the magnetic pole and the repelling magnetic pole face each other per second may be equal to or greater than 20 and equal to or less than 270. According to this aspect, it is possible to further improve the efficiency of film formation. (4) In the above embodiment, the backup roller may have a rotating shaft, and the repulsive magnetic pole member may be located inside the backup roller between the rotating shaft and the magnet roller. This embodiment allows the repulsive magnetic pole member to be made smaller than when the repulsive magnetic pole member is provided throughout the entire interior of the backup roller. This allows the number of rotations of the repulsive magnetic pole member per unit time for the same driving force to be efficiently increased. (5) According to another embodiment of the present disclosure, an electrostatic film formation method is provided. This electrostatic film formation method includes a step of (a) attracting the carrier, which is a magnetic carrier and has electrode particles, which are a film formation material, to a magnet roller by the magnetic force of a magnetic pole, and (b) separating the electrode particles from the carrier and attaching the electrode particles to a film formation surface of a backup roller, and the step (b) includes a step of vibrating the carrier by causing a magnetic field change in a flying area located between the magnet roller and the backup roller by a repulsive magnetic pole that repels the magnetic pole inside the backup roller. According to this embodiment, a periodic magnetic field change is caused in the flying area by the magnetic pole and the repulsive magnetic pole that repels. Therefore, the carrier to which the electrode particles are attached can be vibrated by the magnetic field change. This vibration makes it easier to separate the electrode particles electrostatically bound to the carrier from the carrier, thereby improving the film formation efficiency. The present disclosure can be realized in various forms other than the electrostatic film formation apparatus and electrostatic film formation method described above. For example, the present disclosure can be realized in the form of a manufacturing method for an electrostatic film formation apparatus, a control method for an electrostatic film formation apparatus, a computer program for implementing the control method, a non-transitory recording medium on which the computer program is recorded, etc. [Brief description of the drawings]

[0007] [Figure 1] 1 is a diagram showing a schematic configuration of an electrostatic film forming apparatus according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a diagram for explaining the positional relationship of each component in a film forming unit according to the embodiment. [Diagram 3] 5A and 5B are diagrams for explaining the behavior of electrode particles and carriers in a film forming section. [Figure 4] 1 is a graph showing the relationship between the amount of electrode particle film formation and the magnetic frequency. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] A. Embodiment: FIG. 1 is a diagram showing a schematic configuration of an electrostatic film-forming apparatus 1 according to the present embodiment. FIG. 1 shows the electrostatic film-forming apparatus 1 as viewed from the side. The electrostatic film-forming apparatus 1 attracts a magnetic carrier C to which electrode particles E, which are a film-forming material, are attached by the magnetic force of a magnet roller 20, and vibrates the carrier C to which the electrode particles E are attached by utilizing a change in magnetic field. The electrostatic film-forming apparatus 1 separates the electrode particles E from the carrier C by this vibration and the centrifugal force caused by the rotation of the magnet roller 20, thereby forming an electrode as an aggregate of the electrode particles E. The electrostatic film-forming apparatus 1 forms, for example, a sheet-shaped electrode. The sheet-shaped electrode is used, for example, as an electrode for a secondary battery such as a lithium-ion battery. The electrostatic film-forming apparatus 1 includes a supply unit 2, a film-forming unit 3, a recovery unit 4, an adjustment unit 5, a fixing unit 6, and a control device 7. The electrode particles E are transported in the order of the supply unit 2, the film-forming unit 3, the adjustment unit 5, and the fixing unit 6. That is, in this embodiment, the supply unit 2 is on the upstream side in the transport direction of the electrode particles E. Also, the fixing unit 6 is on the downstream side in the transport direction of the electrode particles E. Also, hereinafter, the direction of gravity is defined as the lower side, and the direction opposite to the direction of gravity is defined as the upper side.

[0009] The supply unit 2 is provided upstream of the film formation unit 3 in the transport direction of the electrostatic film formation apparatus 1. The supply unit 2 supplies electrode particles E and carriers C to the film formation unit 3 described below. The supply unit 2 includes a mixture storage chamber 200 and three supply chambers 211, 212, and 213. First, the electrode particles E and the carriers C will be described below.

[0010] The electrode particles E are diamagnetic and are not attracted by the magnetic force of the magnetic pole member 21 or the repulsive magnetic pole member 60 described later. Furthermore, the electrode particles E have electronic conductivity and contain an active material. When forming a film of a positive electrode, the electrode particles E contain a positive electrode active material. As the positive electrode active material, various oxides, for example, lithium cobalt composite oxide and lithium manganese composite oxide are used. Furthermore, when forming a negative electrode, the electrode particles E contain a negative electrode active material. As the negative electrode active material, for example, a carbon-based material, a lithium titanate-based material, an oxide-based material, an alloy-based material, and a lithium metal-based material are used. Note that the electrode particles E constituting the electrode are not limited to those disclosed herein, and may be any material having electronic conductivity. Furthermore, the electrode particles E may contain two or more types of active materials as long as they are the same polarity active materials.

[0011] The carrier C is composed of ferrite particles, which are magnetic bodies, coated with a non-metallic resin. The non-metallic resin coating is preferably conductive. Since the carrier C is magnetic, it is attracted by the magnetic force of the magnet roller 20, which will be described later, and is adsorbed to the surface of the cylindrical member 30, which will be described later.

[0012] The electrode particles E and the carrier C are mixed by a stirrer, and the electrode particles E adhere to the carrier C to form a mixture EC, which is then supplied to the electrostatic film formation apparatus 1. Specifically, the electrode particles E are negatively charged due to friction with the carrier C, and the mixture EC is formed by electrostatically adhering to the surface of the carrier C in a dispersed state. Note that the mixture EC functions as a magnetic material because it contains the carrier C, which has magnetism.

[0013] Next, each component of the supply unit 2 and its function will be described. The mixture storage chamber 200 is provided upstream of a first supply chamber 211 described later in the supply unit 2. The mixture storage chamber 200 stores the mixture EC. The mixture EC is supplied to the mixture storage chamber 200 through a passage not shown. Furthermore, the mixture EC is supplied from the mixture storage chamber 200 to a first supply chamber 211 described later through a communication port 201 that communicates between the mixture storage chamber 200 and a first supply chamber 211 described later.

[0014] The supply chambers 211, 212, and 213 are provided in this order in the supply unit 2 downstream of the mixture storage chamber 200. The supply chambers 211, 212, and 213 transport the mixture EC supplied from the mixture storage chamber 200 toward the film formation unit 3 described later, and supply it to the film formation unit 3 described later. Hereinafter, the three supply chambers 211, 212, and 213 are referred to as a first supply chamber 211, a second supply chamber 212, and a third supply chamber 213, respectively.

[0015] The first supply chamber 211 receives the mixture EC supplied from the mixture storage chamber 200 and supplies it to the second supply chamber 212. The first supply chamber 211 is provided downstream of the mixture storage chamber 200 and upstream of the second supply chamber 212. The first supply chamber 211 has a semi-cylindrical shape with an open upper portion. On the side of the first supply chamber 211 where the communication port 201 of the mixture storage chamber 200 is located, a first wall portion 215 having a height higher than a second wall portion 216 described later is formed. The first supply chamber 211 includes a first rotor 221 having a plurality of blades. In this embodiment, the first rotor 221 has six blades. The six blades of the first rotor 221 form a shape that spreads radially from a central axis not shown. The first rotor 221 rotates around a central axis not shown under the control of the control device 7 described later. The rotation direction of the first rotor 221 is a direction in which the mixture EC can be supplied to the second supply chamber 212. In Fig. 1, the first rotor 221 rotates in the same direction as the conveying direction. As a result, the mixture EC supplied from the mixture storage chamber 200 is supplied to the second supply chamber 212 by the rotation of the first rotor 221 in the first supply chamber 211.

[0016] The second supply chamber 212 receives the mixture EC supplied from the first supply chamber 211 and supplies it to the film forming unit 3. The second supply chamber 212 is provided downstream of the first supply chamber 211 and upstream of the third supply chamber 213. In this embodiment, among the supply chambers 211, 212, and 213, the second supply chamber 212 is located closest to the pumping magnetic pole N1 described later. The second supply chamber 212 has a semi-cylindrical shape with an open top. A second wall portion 216 is formed between the first supply chamber 211 and the second supply chamber 212 as a partition separating the two. The second supply chamber 212 includes a second rotor 222 having a shape similar to that of the first rotor 221. It is preferable that the second rotor 222 rotates in a direction in which the mixture EC can be well supplied depending on the positional relationship between the second supply chamber 212 and the film forming unit 3. In this embodiment, the second rotor 222 rotates in the same direction as the first rotor 221 around a central axis (not shown) under the control of the control device 7 described later. As a result, the mixture EC supplied from the first supply chamber 211 is supplied to the film forming unit 3 by the rotation of the second rotor 222 in the second supply chamber 212. The mixture EC supplied to the film forming unit 3 is attracted by the magnetic force of a pumping magnetic pole N1, which is one of the magnetic poles of the magnet roller 20 described later, and is adsorbed to the surface of a cylindrical member 30 described later. At this time, a part of the mixture EC supplied from the second supply chamber 212 is not adsorbed to the surface of the cylindrical member 30, and returns to the second supply chamber 212, and flows into the third supply chamber 213 beyond a third wall portion 217 described later.

[0017] The third supply chamber 213 receives the mixture EC that has flowed into the third supply chamber 213 through a third wall portion 217 described later due to the rotation of the second rotor 222, and supplies the mixture EC to the second supply chamber 212. The third supply chamber 213 has a semi-cylindrical shape with an open upper portion. Between the second supply chamber 212 and the third supply chamber 213, a third wall portion 217 is formed as a partition separating the two. In addition, between the third supply chamber 213 and a recovery chamber 420 described later, a fourth wall portion 218 is formed separating the two. The third supply chamber 213 includes a third rotor 223 having a shape similar to that of the first rotor 221. It is preferable that the third rotor 223 rotates in a direction opposite to the rotation direction of the second rotor 222. In this embodiment, the third rotor 223 rotates in a direction opposite to the second rotor 222 around a central axis (not shown) under the control of the control device 7 described later. This allows the mixture EC, which has flowed into the third supply chamber 213 over the third wall portion 217 due to the rotation of the second rotor 222, to be supplied to the second supply chamber 212.

[0018] The film forming unit 3 is provided in the electrostatic film forming apparatus 1 upstream of the supply unit 2 and downstream of the adjustment unit 5 described later. The film forming unit 3 performs a process of attracting the mixture EC supplied from the supply unit 2 to a magnet roller 20 described later and a process of transporting the mixture EC toward a position facing a backup roller 50 described later. Furthermore, the film forming unit 3 performs a process of separating the electrode particles E from the carrier C in a flight region 300 described later and forming a film of the electrode particles E on a film-forming surface 68 described later. The detailed configuration of the film forming unit 3 will be described later.

[0019] FIG. 2 is a diagram for explaining the positional relationship of each component in the film forming unit 3 of this embodiment. FIG. 2 shows a schematic front view of the film forming unit 3 of the electrostatic film forming apparatus 1. FIG. 2 also shows a schematic internal configuration of the electrostatic film forming apparatus 1. The film forming unit 3 includes a magnet roller 20, a backup roller 50, a repulsive magnetic pole member 60, a ground member 80 shown in FIG. 1, and a base 18 that serves as a base for these components. The components in the film forming unit 3 and their positional relationship will be described below. The behavior of the electrode particles E and the carrier C in the film forming unit 3 will be described later. The components in the film forming unit 3 and their positional relationship will be described below.

[0020] The magnet roller 20 includes a cylindrical member 30, a magnetic pole member 21 as a magnetic field generating means, a regulating member 25 shown in FIG. 1, a voltage supply unit (not shown), and electrical wiring (not shown).

[0021] The cylindrical member 30 has a surface that attracts and transports the mixture EC by the magnetic force of the magnetic pole member 21 described later. The cylindrical member 30 has a cylindrical shape. The cylindrical member 30 is formed of a conductive non-magnetic material, for example, aluminum or non-magnetic stainless steel. The longitudinal direction of the cylindrical member 30 is a direction that is horizontal to the base 18. The cylindrical member 30 is composed of a cylindrical member main body 31 and a first shaft portion 32. The cylindrical member main body 31 contains the magnetic pole member 21 described later. The first shaft portion 32 forms a cylindrical rotation axis O1 that is the rotation axis of the cylindrical member 30. The first shaft portion 32 is rotatably supported by a first support member 33 that stands vertically from the base 18, thereby supporting the cylindrical member 30. The cylindrical member 30 rotates around the cylindrical rotation axis O1 under the control of the control device 7 described later. 3, in this embodiment, the rotation direction of the cylindrical member 30 is opposite to the rotation direction of the second rotor 222. In this embodiment, the extension direction of the cylinder rotation axis O1 is the horizontal direction.

[0022] The magnetic pole member 21 is provided inside the cylindrical member 30. The magnetic pole member 21 is composed of a magnetic pole member main body 21a having a smaller diameter than the cylindrical member 30, and a second shaft portion 22. The longitudinal direction of the magnetic pole member 21 is horizontal, similar to the cylindrical member 30.

[0023] The magnetic pole member body 21a is composed of a plurality of magnets, each having magnetic poles N1, S1, N2, S2, and N3. The magnetic pole member body 21a is formed radially around a second shaft portion 22, which will be described later. Details of the magnetic pole member body 21a will be described later with reference to FIG.

[0024] The second shaft portion 22 is provided so as to have a smaller diameter than the magnetic pole member main body 21a. The magnetic pole member 21 is fixed inside the cylindrical member 30 by supporting the second shaft portion 22 of the magnetic pole member 21 by the first support member 33. In this embodiment, the magnetic pole member 21 is fixed without rotating. It is sufficient that the magnetic pole member 21 is fixed without rotating inside the cylindrical member 30, and the position and number of supporting the magnetic pole member 21 are not limited to those disclosed herein.

[0025] The regulating member 25 causes an excess of the mixture EC that has been attracted to the surface of the cylindrical member 30 by the magnetic force of the magnetic pole member 21 to fall off. The regulating member 25 will be described in detail later with reference to FIG.

[0026] The voltage supply unit includes a voltage supply device (not shown) that supplies voltage to the magnet roller 20, particularly to the cylindrical member 30. The magnet roller 20 and the voltage supply unit (not shown) are connected by electrical wiring (not shown). A predetermined voltage is applied to the magnet roller 20 from the voltage supply unit via the electrical wiring (not shown). The manner in which the voltage is applied to the magnet roller 20 during the deposition of the electrode particles E will be described later. Note that the shape, formation position, size, and rotation manner of each component of the magnet roller 20 are not limited to those disclosed herein.

[0027] The backup roller 50 has a film-forming surface 68 on its surface, and conveys a foil F, which will be described later. The backup roller 50 is provided at a distance from the magnet roller 20. In the example shown in FIG. 2, the backup roller 50 is provided above the magnet roller 20. Also, in FIG. 2, a part of the surface of the magnet roller 20 faces a part of the surface of the backup roller 50. The backup roller 50 has a cylindrical shape. The backup roller 50 is made of a conductive material such as metal, for example, aluminum. The longitudinal direction of the backup roller 50 is horizontal.

[0028] The backup roller 50 is composed of a backup roller main body 51 and a third shaft portion 52. The backup roller main body 51 contains a repulsion magnetic pole member 60 described later. The backup roller 50 has a third shaft portion 52 that forms a backup roller rotation axis O3. In FIG. 2, the third shaft portion 52 is provided so as to have a smaller diameter than the backup roller main body 51. The third shaft portion 52 is rotatably supported by a third support member 53 that stands vertically from the base 18, thereby supporting the backup roller 50. The backup roller 50 rotates around the backup roller rotation axis O3, which is the central axis of the backup roller 50, under the control of the control device 7 described later. In this embodiment, the rotation direction of the backup roller 50 is opposite to the rotation direction of the magnet roller 20. In this embodiment, the extension direction of the backup roller rotation axis O3 is the horizontal direction.

[0029] The backup roller 50 has a film-forming surface 68 on which the electrode particles E separated from the carrier C are formed at a position on the surface of the backup roller 50 facing the magnet roller 20. In this embodiment, as shown in FIG. 1, a long foil F is continuously supplied along the film-forming surface 68. That is, the electrode particles E separated from the carrier C are not directly formed on the film-forming surface 68, but are formed on the foil F supplied on the film-forming surface 68. The foil F is formed of a conductive material such as a metal, for example, aluminum. The foil F functions as a base for a sheet-like electrode. The foil F and the pre-formed electrode I as the electrode particles E formed on the foil F are pressed in the fixing unit 6 described later, and the foil F and the electrode particles E are in close contact with each other to be integrated, thereby manufacturing a sheet-like electrode.

[0030] Note that the backup roller 50 only needs to have a diameter larger than that of the repulsion magnetic pole member 60, and the shape, formation position, size, and rotation mode of each component of the backup roller 50 are not limited to those disclosed herein.

[0031] The repulsive magnetic pole member 60 is provided inside the backup roller 50, between the backup roller rotation axis O3 and the magnet roller 20. In this embodiment, the repulsive magnetic pole member 60 is provided below the backup roller rotation axis O3. The repulsive magnetic pole member 60 is a magnetic field generating means. The repulsive magnetic pole member 60 is configured to be displaceable between an opposing position where the opposing magnetic pole N2 of the magnetic pole member 21 described later and the repulsive magnetic pole N of the repulsive magnetic pole member 60 face each other, and a non-opposing position where the opposing magnetic pole N2 and the repulsive magnetic pole N do not face each other. In this embodiment, the repulsive magnetic pole member 60 having the repulsive magnetic pole N is rotated with respect to the opposing magnetic pole N2 described later that exists in a fixed position, so that the repulsive magnetic pole member 60 can be displaced between the opposing position and the non-opposing position. The repulsive magnetic pole member 60 has a repulsive magnetic pole member main body 60a and a fourth shaft portion 62 that forms the repulsive magnetic pole rotation axis O4. The longitudinal direction of the repulsive magnetic pole member 60 is horizontal, similar to the backup roller 50.

[0032] The repulsive magnetic pole member body 60a is composed of a plurality of magnets. As shown in Fig. 1, the magnets constituting the repulsive magnetic pole member body 60a each have a repulsive magnetic pole N. As shown in Figs. 1 and 2, the plurality of magnets constituting the repulsive magnetic pole member body 60a are plate-shaped and supported by a fourth shaft portion 62.

[0033] The fourth shaft portion 62 is rotatably supported inside the backup roller 50. At this time, the repulsive magnetic pole member main body 60a rotates around the repulsive magnetic pole rotation axis O4 under the control of the control device 7 described later. In this embodiment, the repulsive magnetic pole member 60 rotates in the opposite direction to the magnet roller 20. The direction in which the repulsive magnetic pole rotation axis O4 extends is the horizontal direction. The number and the formation position of the magnets constituting the repulsive magnetic pole member main body 60a are not limited to this. The repulsive magnetic pole member main body 60a only needs to have a repulsive magnetic pole N that opposes and repels the opposing magnetic pole N2 described later. The repulsive magnetic pole member main body 60a may be composed of, for example, five magnets and have five magnetic poles. Details of the repulsive magnetic pole member main body 60a will be described later with reference to FIG. 3.

[0034] The shape, formation position, size, rotation mode, and displacement means between the facing position and the non-facing position of each component of the repulsive magnetic pole member 60 are not limited to those described above. The repulsive magnetic pole member 60 may be provided with a smaller diameter than the backup roller 50 and may be configured to be displaceable between the facing position where the facing magnetic pole N2 and the repulsive magnetic pole N face each other and the non-facing position where the facing magnetic pole N2 and the repulsive magnetic pole N do not face each other.

[0035] 1, a description will be given of other components of the electrostatic film formation apparatus 1. The recovery unit 4 recovers the detached mixture EC when the mixture EC that has been adsorbed to the surface of the cylindrical member 30 by the magnetic force of the magnetic pole member 21 is detached. The recovery unit 4 includes a discharge member 410 and a recovery chamber 420.

[0036] The discharge member 410 receives the mixture EC that has been separated as described above, and guides it to the collection chamber 420. In the following, the side of the discharge member 410 where the magnet roller 20 is located is referred to as the tip side. Also, the part of the discharge member 410 that is located opposite to the tip side is referred to as the base side. The tip side of the discharge member 410 is provided between the separation magnetic pole N3 and the pumping magnetic pole N1, which will be described later, among the multiple magnetic poles N1, S1, N2, S2, and N3 that the magnetic pole member 21 has, and is provided so as to face the surface of the cylindrical member 30. Also, the base side of the discharge member 410 is provided in a part of the fourth wall portion 218 that abuts against a part of the collection chamber 420, and is fixed to a part of the collection chamber 420. The shape of the discharge member 410 is not limited to that disclosed herein. The discharge member 410 may have any shape as long as it can guide the mixture EC that has been separated from the magnet roller 20 to the collection chamber.

[0037] The recovery chamber 420 is provided on the base end side of the discharge member 410. The recovery chamber 420 is a space for recovering the mixture EC supplied along the discharge member 410. In this manner, the recovery unit 4 recovers the carrier C and the electrode particles E that were not separated from the carrier C in the film forming unit 3. The electrode particles E and the carrier C recovered in the recovery chamber 420 may be supplied to the supply unit 2 by a connecting member (not shown). In this manner, the electrode particles E and the carrier C recovered in the recovery chamber 420 can be easily reused.

[0038] The adjustment unit 5 checks the state of the pre-formed electrode I as the electrode particles E formed on the foil F in the film forming unit 3, and adjusts the thickness of the film, etc. The adjustment unit 5 includes a thickness correction member 510, a pressing member 520, a sensor 530, and a carrier removal device 540. In this embodiment, the thickness correction member 510, the pressing member 520, the sensor 530, and the carrier removal device 540 are provided in this order in the transport direction of the electrostatic film forming apparatus 1. Note that the components of the adjustment unit 5 and the order in which they are arranged are not limited to those disclosed herein. For example, the components listed in the adjustment unit 5 are not essential, and the adjustment unit 5 may additionally include other components. In addition, the components may be arranged in an order different from that of this embodiment.

[0039] The thickness correction member 510 regulates the thickness of the pre-formed electrode I formed on the foil F on the film-forming surface 68. The thickness correction member 510 is a so-called scraper. The tip of the thickness correction member 510 is provided so as to face the outer surface of the pre-formed electrode I. The thickness correction member 510 is also provided at a position away from the film-forming surface 68 by a predetermined distance in the thickness direction from the film-forming surface 68 to the outer surface of the pre-formed electrode I. Here, while the backup roller 50 rotates, the tip of the thickness correction member 510 comes into contact with the surface of the pre-formed electrode I, whereby a portion exceeding the predetermined thickness is scraped off. That is, the thickness correction member 510 regulates the pre-formed electrode I formed on the foil F on the film-forming surface 68 to a predetermined thickness.

[0040] The pressing member 520 presses the pre-formed electrode I formed on the foil F on the film-forming surface 68, and makes the thickness of the electrode particles E formed constant. In this embodiment, the pressing member 520 is in the form of a roll that rotates around a central axis (not shown) under the control of the control device 7 (described later). In this embodiment, the rotation direction of the pressing member 520 is the same as the rotation direction of the backup roller 50. The pressing member 520 is formed of an insulating material, for example, rubber. The pressing member 520 has a contact surface that contacts the pre-formed electrode I on the film-forming surface 68 of the backup roller 50. The contact surface of the pressing member 520 is provided parallel to the surface of the backup roller 50 so as to face the surface. The pressing member 520 contacts the surface of the pre-formed electrode I while rotating around a central axis (not shown). In this embodiment, the pressing member 520 rotates in the opposite direction to the rotation direction of the backup roller 50. Here, in the thickness direction of the pre-molded electrode I, the distance between the pressing member 520 and the surface of the pre-molded electrode I is preferably shorter than the distance between the thickness correction member 510 and the surface of the pre-molded electrode I. In this way, when the pre-molded electrode I on the foil F, which is restricted to a predetermined thickness by the thickness correction member 510, is brought into contact with the contact surface of the pressing member 520, the thickness of the pre-molded electrode I becomes uniform.

[0041] The sensor 530 detects the state of the pre-formed electrode I formed on the foil F on the deposition surface 68, such as the unevenness and thickness of the surface, the presence or absence of the carrier C, the presence or absence of the foreign matter, etc. The sensor 530 transmits the detected information to the control device 7.

[0042] The carrier removing device 540 removes the carrier C from the pre-molded electrode I when the carrier C is mixed into the pre-molded electrode I during film formation in the film forming unit 3. The carrier removing device 540 is, for example, made of a magnet and is provided to face the pre-molded electrode I. When the pre-molded electrode I is transported together with the foil F in the transport direction and the pre-molded electrode I on the foil F faces the carrier removing device 540, the magnetic carrier C mixed into the pre-molded electrode I is attracted to the carrier removing device 540 by the magnetic force of the carrier removing device 540. In contrast, the foil F in this embodiment is made of aluminum and therefore does not have magnetism, and the electrode particles E constituting the pre-molded electrode I are diamagnetic. Therefore, the foil F and the pre-molded electrode I are not attracted to the magnetic force of the carrier removing device 540 and are not attracted to the carrier removing device 540. In this way, the carrier C mixed into the pre-molded electrode I can be removed and the purity of the electrode particles E on the foil F can be improved. When a magnetic metal foil is used as the foil F, a roller may be provided to prevent the foil F from floating up due to the magnetic force of the carrier removing device 540. In this case, for example, a pair of rollers may be provided on the upstream side and downstream side of the carrier removing device 540 in the conveying direction of the foil F. The carrier removing device 540 may recognize information about the carrier C mixed in the pre-molded electrode I, such as the mixed location and mixed amount, using a sensor and acquire the information via the control device 7.

[0043] The fixing unit 6 presses the foil F and the pre-molded electrode I formed on the foil F to bring them into close contact with each other and integrate them. The fixing unit 6 is provided downstream of the adjustment unit 5 in the conveying direction. The fixing unit 6 includes fixing rollers 610 and 620. The fixing rollers 610 and 620 are a pair of rollers that sandwich the foil F and the pre-molded electrode I formed on the foil F in the conveying direction. That is, the fixing rollers 610 and 620 are provided on one side located on the foil F side and the other side located opposite to the one side as the pre-molded electrode I side. The fixing rollers 610 and 620 rotate in synchronization with the conveying speed of the foil F under the control of the control device 7 described later, and heat the foil F and the pre-molded electrode I by a heating device not shown. Then, when the foil F and the pre-formed electrode I pass between the pair of fixing rollers 610 and 620, the fixing unit 6 applies pressure and heat to fix the pre-formed electrode I to the foil F. This causes the foil F and the pre-formed electrode I to become one, producing a sheet-like electrode.

[0044] The grounding member 80 neutralizes the conductive backup roller 50 and the foil F. The grounding member 80 is grounded. The grounding member 80 abuts against the backup roller body 51 of the backup roller 50 and keeps the backup roller 50 in an uncharged state.

[0045] The control device 7 controls each component of the electrostatic film forming apparatus 1 described above by applying a driving force. In FIG. 1, among the components of the electrostatic film forming apparatus 1 electrically connected to and controlled by the control device 7, a part of the electrical connection state is illustrated as a representative. Specifically, the control device 7 applies a driving force to the first rotor 221, the second rotor 222, the third rotor 223, the cylindrical member 30, the backup roller 50, the repulsion magnetic pole member 60, the pressing member 520, and the fixing rollers 610 and 620. As a result, each of the components 221, 222, 223, 30, 50, 60, 520, 610, and 620 of the electrostatic film forming apparatus 1 rotates. The control device 7 includes a motor (not shown). The control device 7 and each of the components 221, 222, 223, 30, 50, 60, 520, 610, and 620 are connected by electrical wiring. The rotation speed of each of the components 221, 222, 223, 30, 50, 60, 520, 610, and 620 of the electrostatic film forming apparatus 1 is controlled by the number of rotations of the motor of the control device 7.

[0046] Based on the electrostatic film-forming apparatus 1 described above, details of each component in the film-forming section 3 and the behavior of the electrode particles E and the carriers C will be described.

[0047] Fig. 3 is a diagram for explaining the behavior of the electrode particles E and the carrier C in the film forming section 3. Fig. 3 shows a schematic side view of the film forming section 3 of the electrostatic film forming apparatus 1. Fig. 3 also shows only the portion of the long foil F being transported to the film forming surface 68 that contacts the backup roller 50. In the following, first, the configuration of each of the magnetic poles N1, S1, N2, S2, and N3 of the magnetic pole member 21 will be described.

[0048] As described above, in the magnetic pole member 21, the magnetic pole member main body 21a functioning as a magnetic field generating means is composed of a plurality of magnets, each of which has magnetic poles N1, S1, N2, S2, and N3. In this embodiment, the magnetic pole member main body 21a is composed of five magnets. That is, the number of magnetic poles of the magnetic pole member main body 21a is five. As shown in FIG. 3, the five magnets are plate-shaped and have a shape that spreads radially from the second shaft portion 22. In the following, the portion where each magnet constituting the magnetic pole member main body 21a abuts on the second shaft portion 22 is referred to as the first base end. In addition, the portion of each magnet located on the opposite side to the first base end, that is, the portion facing the inner surface of the cylindrical member 30, is referred to as the first tip portion. The magnetic poles N1, S1, N2, S2, and N3 of the magnetic pole member main body 21a are located at the first tip portion of each magnet.

[0049] The magnetic poles N1, S1, N2, S2, and N3 of the magnetic pole member main body 21a are a pumping magnetic pole N1, a first transport magnetic pole S1, a counter magnetic pole N2, a second transport magnetic pole S2, and a detachment magnetic pole N3. The pumping magnetic pole N1, the first transport magnetic pole S1, the counter magnetic pole N2, the second transport magnetic pole S2, and the detachment magnetic pole N3 are provided in this order inside the cylindrical member 30.

[0050] 1, the pumping magnetic pole N1 is provided at a position facing the second supply chamber 212 above the second supply chamber 212. In this embodiment, the polarity of the pumping magnetic pole N1 is an N pole.

[0051] The opposing magnetic pole N2 is provided at a position facing the repulsion magnetic pole member 60. That is, the opposing magnetic pole N2 faces the film-forming surface 68 of the backup roller 50 and the foil F supplied to the film-forming surface 68. In this embodiment, the polarity of the opposing magnetic pole N2 is an N pole.

[0052] The first transfer magnetic pole S1 is provided between the pumping magnetic pole N1 and the opposing magnetic pole N2. In this embodiment, the polarity of the first transfer magnetic pole S1 is an S pole different from the polarity of the pumping magnetic pole N1 and the opposing magnetic pole N2.

[0053] The detachment pole N3 is provided at a position adjacent to the pumping pole N1 and on the second transport pole S2 side of the position where the surface of the cylindrical member 30 faces the tip of the discharge member 410. In this embodiment, the polarity of the detachment pole N3 is an N pole that is the same polarity as the pumping pole N1 adjacent to the detachment pole N3.

[0054] The second transport magnetic pole S2 is provided between the opposing magnetic pole N2 and the detachment magnetic pole N3. In this embodiment, the polarity of the second transport magnetic pole S2 is an S pole different from the polarity of the opposing magnetic pole N2 and the detachment magnetic pole N3.

[0055] The positions and number of the multiple magnetic poles N1, S1, N2, S2, and N3 of the magnetic pole member main body 21a are not limited to these. The magnetic poles of the magnetic pole member main body 21a have an opposing magnetic pole N2 of the same polarity as the repulsive magnetic pole N described later at a position opposing the repulsive magnetic pole N described later, and the portion where the mixture EC is transported by the magnet roller 20 may be positioned so that magnetic poles of different polarities are adjacent to each other.

[0056] Next, the function of each of the magnetic poles N1, S1, N2, S2, and N3 of the magnetic pole member main body 21a and the behavior of the electrode particles E and the carrier C when the mixture EC is transported by the magnet roller 20 will be described.

[0057] First, the mixture EC is attracted to the magnet roller 20. The manner of attraction of the mixture EC to the magnet roller 20 is as follows. As shown in FIG. 1, the supply unit 2 is supplied with the mixture EC in which the negatively charged electrode particles E are electrostatically attached to the carrier C. This mixture EC is transported to the second supply chamber 212 via the mixture storage chamber 200 and the first supply chamber 211. The mixture EC transported to the second supply chamber 212 is pushed up by the multiple wings of the second rotor 222 by the rotation of the second rotor 222, and approaches the magnet roller 20. At this time, the magnetic pole located closest to the second supply chamber 212 is the pumping magnetic pole N1. The polarity of the pumping magnetic pole N1 is the N pole, and the N pole magnetic pole has the property of attracting a magnetic body by a magnetic force. In addition, the mixture EC, which is a mixture of the magnetic carrier C and the electrode particles E, functions as a magnetic body as described above. Therefore, when a magnetic force is applied to the mixture EC, the mixture EC is in a state where it is attracted or repelled by the applied magnetic force, and its behavior follows the magnetic field lines. The magnetic field lines here refer to lines that virtually represent the distribution of the magnetic field around each magnetic pole. As a result, the mixture EC pushed up by the second rotor 222 of the second supply chamber 212 is attracted to the magnet roller 20 side by the magnetic force of the pumping magnetic pole N1 located closest to the second supply chamber 212. Furthermore, the mixture EC attracted to the pumping magnetic pole N1 is attracted to a position facing the pumping magnetic pole N1 on the surface of the cylindrical member 30 that constitutes the outer shape of the magnetic pole member 21.

[0058] The mixture EC adsorbed to the surface of the cylindrical member 30 forms a shape that follows the direction of the magnetic field lines. Specifically, the mixture EC adsorbed to the position facing the pumping magnetic pole N1 rises in a direction away from the position where the pumping magnetic pole N1 and the cylindrical member 30 face each other, as shown in FIG. 3. At this time, the mixture EC forms a magnetic ear with the carrier C as an axis and the electrode particles E attached to the carrier C, which has a rice ear shape. That is, the ear axis of the rice ear corresponds to the carrier C in this embodiment. Also, the rice grains in the rice ear correspond to the electrode particles E in this embodiment. In the example shown in FIG. 3, the mixture EC adsorbed to the position facing the pumping magnetic pole N1 is in a state where a plurality of electrode particles E are attached to seven carriers C. At this time, as the cylindrical member 30 rotates, the mixture EC, while adsorbed to the surface of the cylindrical member 30, is conveyed in the rotation direction of the magnet roller 20 as shown in FIG. 3 while changing the rice ear shape to a shape that follows the magnetic field lines.

[0059] A regulating member 25 is provided between the pumping magnetic pole N1 and the first transport magnetic pole S1. In this case, in order to regulate the length of the mixture EC attracted to the magnet roller 20 to a predetermined length during the transport process of the magnet roller 20, the regulating member 25 is provided at a position spaced a predetermined distance from the surface of the cylindrical member 30. In addition, since the regulating member 25 is provided so that the tip side faces the surface of the cylindrical member 30, when the cylindrical member 30 rotates, the mixture EC attracted to the magnet roller 20 comes into contact with the tip side of the regulating member 25. Then, the carrier C and the electrode particles E that are excessively attracted beyond the predetermined length are separated by contact with the tip side of the regulating member 25 and fall off. As a result, the mixture EC attracted to the magnet roller 20 is transported toward the first transport magnetic pole S1 with the length of the mixture EC being uniformed. Of the mixture EC attracted to the magnet roller 20, the electrode particles E and carrier C separated and dropped by the regulating member 25 are received in the supply chambers 211-213 and are supplied again to the pumping magnetic pole N1. The shape and the position of the regulating member 25 are not limited to those disclosed herein. The regulating member 25 may be provided at a position between the pumping magnetic pole N1 and the opposing magnetic pole N2 in the rotation direction of the cylindrical member 30 and facing the mixture EC attracted to the magnet roller 20. The regulating member 25 may be located, for example, between the first transport magnetic pole S1 and the opposing magnetic pole N2.

[0060] Furthermore, due to the rotation of the cylindrical member 30, the mixture EC attracted to the magnet roller 20 is transported to the first transport magnetic pole S1 while its shape follows the magnetic field lines. The polarity of the magnetic poles of the pumping magnetic pole N1 and the first transport magnetic pole S1 is different. If the magnetic pole located at the first transport magnetic pole S1 is the same N pole as the pumping magnetic pole N1, a repulsive magnetic field is generated between the pumping magnetic pole N1 and the adjacent magnetic pole, and the mixture EC attracted to the magnet roller 20 is detached from the magnet roller 20. In contrast, in this embodiment, the first transport magnetic pole S1 having a polarity different from that of the pumping magnetic pole N1 is provided, so that the mixture EC is transported while being inverted. In the surface of the cylindrical member 30, near the center between the pumping magnetic pole N1 and the first transport magnetic pole S1, the mixture EC forms a bow-shaped curved shape following the magnetic field lines. That is, the base end and the front end of the mixture EC are reversed between the time when the mixture EC is attracted to a position facing the pumping magnetic pole N1 and the time when the mixture EC is attracted to a position facing the first transport magnetic pole S1.

[0061] The mixture EC transported to the position facing the first transport magnetic pole S1 is further transported toward the position where the magnet roller 20 and the backup roller 50 face each other, and reaches a region on the surface of the cylindrical member 30 close to the opposing magnetic pole N2. In the region between the magnet roller 20 and the backup roller 50, which contains the opposing magnetic pole N2, the electrode particles E separate from the carrier C and fly, adhering to the foil F. Therefore, this region between the magnet roller 20 and the backup roller 50 is also called the flying region 300. The first transport magnetic pole S1 and the opposing magnetic pole N2 have different magnetic pole polarities. Therefore, the manner in which the mixture EC attracted to the magnet roller 20 is transported from the first transport magnetic pole S1 to the opposing magnetic pole N2 is the same as the transport manner described above.

[0062] As described above, in the repulsive magnetic pole member 60, the repulsive magnetic pole member main body 60a functioning as a magnetic field generating means is composed of a plurality of magnets, each of which has a repulsive magnetic pole N. In this embodiment, the repulsive magnetic pole member main body 60a is composed of four magnets. That is, the repulsive magnetic pole member main body 60a in this embodiment has four repulsive magnetic poles N. Since the functions of the four repulsive magnetic poles N in the repulsive magnetic pole member main body 60a are the same, the same reference numerals are given in FIG. 3. As shown in FIG. 3, the four magnets constituting the repulsive magnetic pole member main body 60a are plate-shaped and have a shape that spreads radially from the fourth shaft portion 62 as the center. In this embodiment, the four magnets constituting the repulsive magnetic pole member main body 60a are provided at equal intervals. In the following, the portion where each magnet constituting the repulsive magnetic pole member main body 60a abuts against the fourth shaft portion 62 is referred to as the second base end. In addition, the portion of each magnet located on the opposite side to the second base end, that is, the portion facing the inner surface of the cylindrical member 30, is referred to as the second tip end. The four repulsive magnetic poles N of the repulsive magnetic pole member body 60a are located at the second tip of each magnet.

[0063] The repulsive magnetic pole N is a magnetic pole that opposes and repels the opposing magnetic pole N2. That is, since the polarity of the opposing magnetic pole N2 is an N pole, the repulsive magnetic pole N is also an N pole of the same polarity as the opposing magnetic pole N2. In the following, an electrostatic film formation method using the electrostatic film formation device 1, the behavior of the mixture EC in the flight region 300, and the film formation mode of the electrode particles E will be described.

[0064] When the mixture EC is transported to the flight region 300, some of the electrode particles E constituting the mixture EC are separated from the carrier C by the following two forces.

[0065] The first force is centrifugal force. Specifically, due to the centrifugal force generated by the rotation of the cylindrical member 30, some of the electrode particles E constituting the mixture EC are separated from the carrier C. In the separation mode caused by centrifugal force, the electrostatic constraint between the electrode particles E and the carrier C in the mixture EC tends to be dominant compared to the film formation in which the electrode particles E are electrostatically attached to the foil F on the film formation surface 68 described later. In other words, the electrostatically constrained electrode particles E are difficult to separate from the carrier C. Therefore, there may be cases in which high film formation efficiency cannot be obtained in the film formation of the electrode particles E.

[0066] In contrast, the electrostatic film forming apparatus 1 of this embodiment additionally generates a second force as shown below. The second force is a force that causes a periodic change in the magnetic field in the flight area 300 to vibrate the carrier C. Specifically, it is as follows. The opposing magnetic pole N2 and the repulsive magnetic pole N are N poles of the same polarity, and when the opposing magnetic pole N2 and the repulsive magnetic pole N face each other, the magnetic fields formed by the magnetic forces generated by the two poles collide with each other, and a magnetic field in a repulsive direction is generated between the two poles. Here, the magnetic pole member 21 does not rotate but is fixed, and the repulsive magnetic pole member 60 rotates around the repulsive magnetic pole rotation axis O4. As a result, in the flight area 300, the repulsive magnetic pole N faces the opposing magnetic pole N2 at a fixed position periodically.

[0067] Consider a case where the distance between the opposing magnetic pole N2 and the repulsive magnetic pole N is increased from the opposing position where the opposing magnetic pole N2 and the repulsive magnetic pole N are opposed to each other by the rotation of the repulsive magnetic pole member 60. In this case, the strength of the magnetic field in the repulsive direction generated between the opposing magnetic pole N2 and the repulsive magnetic pole N becomes weaker in proportion to the distance between the opposing magnetic pole N2 and the repulsive magnetic pole N compared to the opposing position. When the distance between the opposing magnetic pole N2 and the repulsive magnetic pole N is the farthest among the non-opposing positions described above, the strength of the magnetic field in the repulsive direction generated between them is the smallest. On the other hand, when the repulsive magnetic pole member 60 rotates further, the distance between the opposing magnetic pole N2 and the repulsive magnetic pole N approaches again. At this time, the strength of the magnetic field in the repulsive direction generated between the opposing magnetic pole N2 and the repulsive magnetic pole N becomes stronger as the repulsive magnetic pole N approaches the opposing magnetic pole N2. Then, when the opposing magnetic pole N2 and the repulsive magnetic pole N are again in the opposing position where they are opposed to each other, the strength of the magnetic field in the repulsive direction generated between them is maximized. In this manner, the electrostatic film forming apparatus 1 generates a periodic change in the magnetic field in the flight area 300.

[0068] When considering the influence of the magnetic field change on the mixture EC, it is easier to understand by using magnetic field lines that virtually represent the distribution of the magnetic field generated around the opposing magnetic pole N2 and the repulsive magnetic pole N. As described above, when a periodic magnetic field change is generated, the shape of the mixture EC attracted to the magnet roller 20 changes in accordance with the change in the magnetic field lines accompanying the periodic magnetic field change. Specifically, when the opposing magnetic pole N2 and the repulsive magnetic pole N face each other at the opposing position, that is, when the strength of the magnetic field in the repulsive direction is maximum, the magnetic field in the repulsive direction formed between them is drawn with magnetic field lines that separate them. Therefore, the mixture EC attracted to the magnet roller 20 follows the magnetic field lines, and the carrier C that forms the axis of the mixture EC falls down. In FIG. 3, the shape of the mixture EC when the strength of the magnetic field in the repulsive direction is maximum at the opposing position is shown by solid lines. On the other hand, when the distance between the opposing magnetic pole N2 and the repulsive magnetic pole N is the farthest, that is, when the strength of the magnetic field in the repulsive direction is the smallest, the magnetic lines of both exist without blocking each other. In other words, no magnetic field is generated to separate the opposing magnetic pole N2 and the repulsive magnetic pole N. Therefore, when the opposing magnetic pole N2 and the repulsive magnetic pole N are at the farthest distance in the non-opposing position, the carrier C forming the axis of the mixture EC is in an upright state. In FIG. 3, the shape of the mixture EC when the strength of the magnetic field in the repulsive direction is at its smallest in the non-opposing position is shown by a dotted line. In this way, with the periodic magnetic field change, the mixture EC attracted to the magnet roller 20 repeatedly falls and stands up like a dust beater with the carrier C forming the axis of the mixture EC. In other words, with the periodic magnetic field change, the mixture EC vibrates when attracted to the magnet roller 20. 3, the vibration of the carrier C forming the axis of the mixture EC is shown by a double-headed arrow in the flight area 300. Since the mixture EC is a magnetic material, the vibration of the mixture EC caused by the periodic change in the magnetic field can be called magnetic vibration.

[0069] Here, the mixture EC is in a state where the electrode particles E are attached to the carrier C. Therefore, as described above, in the flight region 300, the carrier C undergoes magnetic vibration in accordance with the periodic change in the magnetic field, and the magnetic vibration propagates throughout the mixture EC. As a result, some of the electrode particles E are separated from the carrier C. At this time, the mode in which some of the electrode particles E are separated from the carrier C by the magnetic vibration of the mixture EC is a state in which the electrode particles E attached to the carrier C constituting the mixture EC are shaken off by the magnetic vibration. In other words, when some of the electrode particles E are separated from the carrier C by the magnetic vibration, it can be said that some of the electrode particles E separated from the carrier C fly toward the foil F on the deposition surface 68. In the example shown in FIG. 3, the electrode particles E that are separated from the carrier C and fly in the flight region 300 are shown as flying electrode particles E1.

[0070] The repulsive magnetic pole member 60 in this embodiment is provided inside the backup roller 50, between the backup roller rotation axis O3 and the magnet roller 20. In this way, the repulsive magnetic pole member 60 can be made smaller than when the repulsive magnetic pole member 60 is provided throughout the entire interior of the backup roller 50. This makes it possible to efficiently increase the number of rotations of the repulsive magnetic pole member 60 per unit time for the same driving force. In other words, by making the repulsive magnetic pole member 60 smaller, the magnetic vibration frequency, which will be described later, can be efficiently increased.

[0071] Next, we will explain how flying electrode particles E1, which are electrode particles E separated from a carrier C, are formed onto a foil F transported to a film-forming surface 68 by at least one of the two forces mentioned above, namely centrifugal force and force due to magnetic vibration.

[0072] As described above, the magnet roller 20 is connected to a voltage supply unit (not shown) for supplying a voltage to the magnet roller 20. In this embodiment, the voltage supply unit (not shown) applies a DC voltage of 2550 V to the magnet roller 20. On the other hand, the backup roller 50 is connected to the ground member 80 as described above. In this embodiment, the backup roller 50 is grounded (earthed) by the ground member 80, so the voltage is 0 V. As a result, the electrostatic film forming apparatus 1 is in a state where a potential difference is provided between the magnet roller 20 and the backup roller 50. Note that the voltage applied to the magnet roller 20 is not limited to this, and for example, a DC voltage superimposed with an AC voltage may be applied.

[0073] As described above, in the electrostatic film forming apparatus 1, a potential difference is provided between the magnet roller 20 that attracts and conveys the mixture EC and the backup roller 50 that has the film forming surface 68 on its surface. Therefore, the negatively charged flying electrode particles E1 are subjected to an electrostatic force (Coulomb force) from the magnet roller 20 toward the backup roller 50. Specifically, when the negatively charged flying electrode particles E1 approach the backup roller 50, positive charges are collected on the surface of the backup roller 50 due to electrostatic induction. At this time, the backup roller 50 is grounded (earthed) by the grounding member 80. Therefore, the negative charge on the backup roller 50 flows to the ground, and the positive charge of the free electrons from the ground and the negative charge on the backup roller 50 are neutralized, and the negative charge on the backup roller 50 disappears as if it had flowed to the ground. As a result, the surface of the backup roller 50 becomes positively charged. As a result, the flying electrode particles E1 separated from the carrier C due to at least one of the centrifugal force and the force due to magnetic vibration fly toward the deposition surface 68 of the backup roller 50 due to electrostatic force, and adhere to the foil F transported to the deposition surface 68, thereby forming a film.

[0074] The electrostatic force generated between the magnet roller 20 and the backup roller 50 contributes to the process of forming, on the foil F, flying electrode particles E1 as electrode particles E separated from the carrier C, and also to the process of separating the electrode particles E from the carrier C. That is, of the two forces that separate the electrode particles E attached to the carrier C, the electrostatic force generated between the magnet roller 20 and the backup roller 50 acts in a direction that promotes the separation of the electrode particles E from the carrier C.

[0075] The mixture EC transported to the flight region 300 is further transported to the second transport magnetic pole S2 by the rotation of the cylindrical member 30. Next, the mixture EC transported to the second transport magnetic pole S2 is transported to the detachment magnetic pole N3 by the rotation of the cylindrical member 30. The transport manner of the mixture EC at this time is the same as the transport manner in which the mixture EC is transported from the pumping magnetic pole N1 to the counter magnetic pole N2 via the first transport magnetic pole S1 described above, and therefore a description thereof will be omitted.

[0076] The mixture EC transported to the detachment magnetic pole N3 is transported in the direction of the pumping magnetic pole N1 by the rotation of the cylindrical member 30. In this transport process, since the detachment magnetic pole N3 and the pumping magnetic pole N1 have the same polarity, a magnetic field in a repulsive direction is formed between the detachment magnetic pole N3 and the pumping magnetic pole N1. This magnetic field in a repulsive direction formed to separate the detachment magnetic pole N3 and the pumping magnetic pole N1 forms a magnetic field-free zone at the boundary between them. As a result, the mixture EC attracted to the magnet roller 20 is released from the magnet roller 20.

[0077] According to the electrostatic film-forming apparatus 1 described above, the magnetic pole member 21 is provided inside the magnet roller 20 that attracts and transports the mixture EC. The magnetic pole member 21 includes the opposing magnetic pole N2 as a magnetic pole located in the flight area 300 among the multiple magnetic poles N1, S1, N2, S2, and N3 included in the magnetic pole member main body 21a. Meanwhile, the backup roller 50 having the film-forming surface 68 includes a repulsive magnetic pole member 60 inside. The repulsive magnetic pole member 60 includes a repulsive magnetic pole N as a magnetic pole that opposes and repels the opposing magnetic pole N2. The opposing magnetic pole N2 and the repulsive magnetic pole N periodically oppose each other, so that the electrostatic film-forming apparatus 1 generates a periodic magnetic field change. That is, in a state where the mixture EC is attracted to the magnet roller 20, the electrostatic film-forming apparatus 1 generates a force that shakes off the electrode particles E from the carrier C by magnetically vibrating the mixture EC by the magnetic field change in addition to the centrifugal force accompanying the rotation of the cylindrical member 30.

[0078] The rotation speed of the repulsive magnetic pole member 60 was changed to measure the change in the amount of film formed by the electrode particles E. FIG. 4 is a graph showing the relationship between the amount of film formed by the electrode particles E and the magnetic frequency (rotation speed). FIG. 4 shows, as the result of this measurement, the relationship between the magnetic frequency at the time of measurement and the value of the amount of film formed corresponding to the magnetic frequency at the time of measurement. The vertical axis of the graph in FIG. 4 represents the amount of film formed by the electrode particles E on the foil F transported to the film-forming surface 68, expressed as 1 cm. 2 4 indicates the weight of electrode particles E formed per cm 2 of foil F. The horizontal axis of the graph in FIG. 4 indicates the magnetic frequency. The film formation efficiency was calculated from the results of this measurement. The film formation efficiency here is the value obtained by dividing the weight of electrode particles E formed on the foil F transported to the film formation surface 68 by the amount of electrode particles E supplied to the film formation unit 3. In other words, the film formation efficiency is the ratio of the weight of electrode particles E formed on the foil F transported to the film formation surface 68 to the amount of electrode particles E supplied to the film formation unit 3. 2 This is a value indicating how much weight of electrode particles E was formed per foil F. In this measurement, the film formation efficiency was calculated as (weight of electrode particles E formed on foil F) / (weight of electrode particles E collected without being formed into a film + weight of electrode particles E formed on foil F). In this measurement, the unit of the weight of the formed electrode particles E is expressed in milligrams (mg). In addition, the unit of the film formation efficiency in this measurement is mg / cm. 2 It is.

[0079] As a prerequisite for creating the graph of Fig. 4, the closest distance between the cylindrical member 30 constituting the outer shape of the magnet roller 20 and the backup roller 50 having the film-forming surface 68 on its surface was set to 6 to 10 mm. A DC voltage of 2550 V was applied to the magnet roller 20, and the backup roller 50 was set to 0 V by abutting it against a grounded member 80 that was grounded (earthed), providing a potential difference of 2550 V between them. The carrier C and the electrode particles E were supplied to the supply unit 2 at a weight ratio of 10:1. In this measurement, the amount of mixture EC supplied to the film-forming unit 3 was set to approximately 30 mg / cm 2 Specifically, the amount of mixture EC supplied was 29.27 mg / cm when the magnetic vibration frequency was 0 Hz, as described below. 2 , and 29.29 mg / cm at 20 Hz. 2 , and 29.22 mg / cm at 200 Hz. 2 , and 29.31 mg / cm at 267 Hz. 2 In this measurement, the circumferential speed as the rotation speed of the cylindrical member 30 and the backup roller 50 was a predetermined value and was constant regardless of the magnetic vibration frequency. In addition, the circumferential speed as the rotation speed of the repulsive magnetic pole member 60 was controlled by the motor constituting the control device 7 so that it matched the magnetic vibration frequency to be measured, and the rotation speed of the repulsive magnetic pole member 60 was controlled. The result of this measurement under the above conditions is shown in FIG. 4.

[0080] The magnetic frequency in this measurement refers to the number of times the opposing magnetic pole N2 and the repulsive magnetic pole N face each other per second. That is, the magnetic frequency is also the number of magnetic vibrations per second that occur when the opposing magnetic pole N2 and the repulsive magnetic pole N face each other. In the following, the unit of the magnetic frequency in this measurement is expressed in Hertz (Hz). Note that the magnetic frequency in this embodiment depends on the number of magnets that the repulsive magnetic pole member 60 has, the number of repulsive magnetic poles N associated therewith, and the rotational frequency of the repulsive magnetic pole member 60. At this time, the rotational frequency of the repulsive magnetic pole member 60 is adjusted by the rotational speed of the repulsive magnetic pole member 60. In this measurement, the magnetic frequency is adjusted by varying the rotational frequency of the repulsive magnetic pole member 60 while keeping the number of repulsive magnetic poles N constant at four.

[0081] In this measurement, in order to compare the change in film formation efficiency with the change in magnetic frequency, the measurement was performed at four different magnetic frequencies. The four magnetic frequencies measured were 0 Hz, 20 Hz, 200 Hz, and 267 Hz, as shown in FIG. 4. Here, when the magnetic frequency is 0 Hz, the repulsive magnetic pole member 60 is not rotated, that is, no periodic magnetic field change is generated, and the mixture EC is not magnetically vibrating. Below, a comparison is made between the case where the magnetic frequency is 0 Hz and the case where the mixture EC is magnetically vibrating to some extent (magnetic frequencies of 20 Hz, 200 Hz, and 267 Hz).

[0082] First, as shown in FIG. 4, when the magnetic vibration frequency is 0 Hz, the deposition amount of electrode particles E is 4.39 mg / cm 2 In contrast, when the magnetic vibration frequency was 20 Hz, that is, when the opposing magnetic pole N2 and the repulsive magnetic pole N were opposed to each other 20 times per second, the amount of film formation of the electrode particles E was 4.98 mg / cm 2 The film formation efficiency at this time was about 17.0%. As a result, when comparing the case where the mixture EC was not subjected to magnetic vibration with the case where the mixture EC was subjected to magnetic vibration, the amount of film formation of the electrode particles E was greater when the mixture EC was subjected to magnetic vibration. In addition, when the mixture EC was subjected to magnetic vibration, an improvement in film formation efficiency of about 2.0% was observed compared to the case where the mixture EC was not subjected to magnetic vibration.

[0083] Furthermore, when the magnetic vibration frequency is 200 Hz, that is, when the opposing magnetic pole N2 and the repulsive magnetic pole N are opposed to each other 200 times per second, the film formation amount of the electrode particles E is 5.26 mg / cm 2 The film formation efficiency at this time was about 18.0%. That is, by increasing the magnetic vibration frequency, that is, by increasing the number of times per second that the opposing magnetic pole N2 and the repulsive magnetic pole N face each other, the amount of film formation of the electrode particles E increased, and an improvement in the film formation efficiency was observed. Specifically, when the mixture EC was magnetically vibrated at a magnetic vibration frequency of 200 Hz, the film formation efficiency improved by about 3.0% compared to when the mixture EC was not magnetically vibrated. Furthermore, when the mixture EC was magnetically vibrated at a magnetic vibration frequency of 200 Hz, the film formation efficiency improved by about 1.0% compared to when the mixture EC was magnetically vibrated at a magnetic vibration frequency of 20 Hz. From this, it was possible to improve the film formation efficiency by generating a periodic magnetic field change and magnetically vibrating the mixture EC. Furthermore, when the magnetic vibration frequency was increased to 200 Hz, a further improvement in the film formation efficiency was achieved.

[0084] Here, when the magnetic vibration frequency is increased from 200 Hz to 267 Hz, that is, when the opposing magnetic pole N2 and the repulsive magnetic pole N are opposed to each other 267 times per second, the film formation amount of the electrode particles E is 5.13 mg / cm 2 and the film formation efficiency at this time was about 17.5%. Specifically, when the mixture EC was magnetically vibrated at a magnetic frequency of 267 Hz, the film formation efficiency was reduced by about 0.5% compared to when the mixture EC was magnetically vibrated at a magnetic frequency of 200 Hz. In other words, the magnetic vibration of the mixture EC due to the periodic magnetic field change contributes to improving the film formation amount of the electrode particles E and the film formation efficiency associated therewith. However, when the magnetic vibration frequency exceeds a certain value (hereinafter referred to as a threshold value), the film formation amount and film formation efficiency of the electrode particles E tend to decrease. In other words, the magnetic vibration frequency is an index for exerting the effect of improving the film formation amount and film formation efficiency of the electrode particles E, and the threshold value can be said to be its maximum value.

[0085] From the above results, when the mixture EC was subjected to magnetic vibration, the amount of film formation was improved by up to about 19.8% compared to when the mixture EC was not subjected to magnetic vibration. In addition, when the mixture EC was subjected to magnetic vibration, the film formation efficiency was improved by up to about 3.0% compared to when the mixture EC was not subjected to magnetic vibration. In other words, when the mixture EC was subjected to magnetic vibration, the amount and efficiency of film formation of the electrode particles E on the film formation surface 68 were improved due to the periodic magnetic field change caused by periodically opposing the opposing magnetic pole N2 and the repulsive magnetic pole N.

[0086] Furthermore, from the above results, the magnetic frequency in the electrostatic film-forming apparatus 1 that forms a film of particles such as electrode particles E using a magnet roller as a magnetic field generating means is preferably 20 Hz or more. The magnetic frequency in the electrostatic film-forming apparatus 1 is preferably 270 Hz or less, more preferably 267 Hz or less. In other words, in the electrostatic film-forming apparatus 1, the number of times that the opposing magnetic pole N2 and the repulsive magnetic pole N, which is a magnetic pole that opposes the opposing magnetic pole N2, face each other per second is preferably 20 times or more. In addition, in the electrostatic film-forming apparatus 1, the number of times that the opposing magnetic pole N2 and the repulsive magnetic pole N face each other per second is preferably 270 times or less, more preferably 267 times or less.

[0087] In addition, when the magnetic frequency exceeds the threshold, the amount of the electrode particles E formed and the associated film formation efficiency decrease due to the following factors. First, due to the magnetic field in the repulsive direction generated between the opposing magnetic pole N2 and the repulsive magnetic pole N by the opposing magnetic pole N2, the mixture EC cannot stand up with the carrier C as an axis, and falls along the surface side of the cylindrical member 30. After the mixture EC falls down in this way, the distance between the opposing magnetic pole N2 and the repulsive magnetic pole N increases with the rotation of the repulsive magnetic pole member 60. In this process, if the magnetic frequency is below the threshold, the strength of the magnetic field in the repulsive direction generated between the opposing magnetic pole N2 and the repulsive magnetic pole N weakens, and the mixture EC gradually rises up with the carrier C as an axis. Furthermore, in the process of the opposing magnetic pole N2 and the repulsive magnetic pole N approaching each other again, if the strength of the magnetic field in the repulsive direction generated between them increases, the mixture EC falls down again, and by repeating this, the mixture EC magnetically vibrates. However, when the magnetic frequency exceeds the threshold, the interval until the opposing magnetic pole N2 and the repulsive magnetic pole N face each other again after the opposing magnetic pole N2 and the repulsive magnetic pole N face each other again becomes shorter than when the magnetic frequency is equal to or less than the threshold. As a result, after the mixture EC falls due to the magnetic field in the repulsive direction formed between the opposing magnetic pole N2 and the repulsive magnetic pole N as described above, the opposing magnetic pole N2 and the repulsive magnetic pole N face each other again before standing up around the carrier C, so that the mixture EC continues to fall. In other words, when the magnetic frequency exceeds the threshold, it is considered that the mixture EC will no longer follow the change in the magnetic field created by the opposing magnetic pole N2 and the repulsive magnetic pole N.

[0088] According to the above embodiment, the electrostatic film-forming apparatus 1 includes a magnet roller 20 that attracts and conveys the mixture EC as the carrier C to which the electrode particles E are attached, an opposing magnetic pole N2 located inside the magnet roller 20, and a repulsive magnetic pole N located inside the backup roller 50 having the film-forming surface 68, which faces and repels the opposing magnetic pole N2. The opposing magnetic pole N2 and the repulsive magnetic pole N periodically face each other, so that the electrostatic film-forming apparatus 1 generates a periodic magnetic field change. That is, in a state where the mixture EC is attracted to the magnet roller 20, the electrostatic film-forming apparatus 1 magnetically vibrates the mixture EC by the magnetic field change in addition to the centrifugal force accompanying the rotation of the cylindrical member 30. This makes it possible to easily separate the electrode particles E electrostatically bound to the carrier C from the carrier C in the film-forming technique using the magnet roller 20 as the magnetic field generating means. In other words, the electrostatic film-forming apparatus 1 can easily separate the electrode particles E electrostatically bound to the carrier C from the carrier C. As a result, the film-forming efficiency can be improved.

[0089] According to the above embodiment, when the mixture EC is magnetically vibrated by generating a periodic magnetic field change, the amount of electrode particles E formed per unit area and the associated film formation efficiency are improved compared to when the mixture EC is not magnetically vibrated. As a result, the electrostatic film formation device 1 can easily separate the particles electrostatically bound to the carrier C from the carrier C by generating a periodic magnetic field change.

[0090] Furthermore, according to the above embodiment, the number of times the opposing magnetic pole N2 and the repelling magnetic pole N face each other per second, i.e., the magnetic frequency, can be controlled by controlling the motor. This controllable magnetic frequency correlates with the amount of film formation of the electrode particles E. Thus, by controlling the magnetic frequency, the electrostatic film formation device 1 can further improve the amount of film formation of the electrode particles E and the associated film formation efficiency.

[0091] B. Other embodiments: B-1. Alternative embodiment 1: In the above embodiment, the entire backup roller 50 is kept in an uncharged state by the ground member 80. That is, the electrode particles E separated from the carrier C are deposited on the foil F conveyed to the film-forming surface 68 over the entire film-forming surface 68 located on the surface of the backup roller 50. However, the present disclosure is not limited to this. Instead of the ground member 80, a charging roller that charges the backup roller 50 to a uniform charge and a laser device that makes a part of the film-forming surface 68 uncharged may be provided. For example, the charging roller negatively charges the surface of the backup roller 50. In addition, the laser device is provided at a position separated from the backup roller 50, for example, like laser irradiation in toner development, and removes electricity by irradiating a predetermined area on the film-forming surface 68 with a laser beam, forming an uncharged area on a part of the film-forming surface 68. Even in such a form, the electrostatic film-forming device 1 is provided with an opposing magnetic pole N2 and a repulsive magnetic pole N, and the two are periodically opposed to each other to generate a periodic magnetic field change. This makes it possible to easily separate the electrode particles E electrostatically bound to the carrier C from the carrier C in a film formation technique using the magnet roller 20 as a magnetic field generating means. In other words, the film formation efficiency can be improved. Furthermore, with this configuration, the area on the film formation surface 68 where the electrode particles E are formed and the film formation width can be controlled.

[0092] B-2. Alternative embodiment 2: In the above embodiment, the repulsive magnetic pole member 60 formed by a plurality of magnets having repulsive magnetic poles N is rotated with respect to the opposing magnetic pole N2 present at a fixed position, so that the opposing position and the non-opposing position can be displaced. However, the present disclosure is not limited to this. The repulsive magnetic pole member 60 may be formed by a single magnet having repulsive magnetic poles N, and may be displaced between the opposing position and the non-opposing position by moving horizontally inside the backup roller 50 instead of rotating. Even in this form, the electrostatic film forming apparatus 1 includes the opposing magnetic pole N2 and the repulsive magnetic pole N, and is capable of displacing between the opposing position and the non-opposing position, so that the carrier C to which the electrode particles E are attached can be vibrated by a change in magnetic field. This vibration makes it easier to separate the electrode particles E electrostatically bound to the carrier C from the carrier C, so that the film forming efficiency can be improved.

[0093] B-3. ​​Alternative embodiment 3: In the above embodiment, the repulsive magnetic pole member 60 formed by a plurality of magnets having repulsive magnetic poles N is rotated with respect to the counter magnetic pole N2 present at a fixed position, so that it can be displaced between the facing position and the non-facing position. However, the present disclosure is not limited to this. The magnetic pole member 21 and the repulsive magnetic pole member 60 may be electromagnets. Even in such a form, the electrostatic film formation device 1 is provided with the counter magnetic pole N2 and the repulsive magnetic pole N, and can be displaced between the facing state in which the counter magnetic pole N2 and the repulsive magnetic pole N face each other and the non-facing state in which they do not face each other. This makes it possible to vibrate the carrier C to which the electrode particles E are attached by a change in the magnetic field. In other words, the electrode particles E electrostatically bound to the carrier C by this vibration can be easily separated from the carrier C, so that the film formation efficiency can be improved.

[0094] B-4. Alternative embodiment 4: In the above embodiment, the number of magnets constituting the repulsive magnetic pole member main body 60a was four, and they were plate-shaped. In addition, since each of the magnets constituting the repulsive magnetic pole member main body 60a has a repulsive magnetic pole N, the number of repulsive magnetic poles N provided in the repulsive magnetic pole member 60 was four. However, the present disclosure is not limited to this, and the shape, number, size, and number of repulsive magnetic poles N constituting the repulsive magnetic pole member 60 can be any. The repulsive magnetic pole member 60 only needs to have a repulsive magnetic pole N that opposes and repels the opposing magnetic pole N2 located inside the magnet roller 20 that attracts and conveys the carrier C to which the electrode particles E are attached. Even in this form, the electrostatic film formation device 1 has the opposing magnetic pole N2 and the repulsive magnetic pole N, and periodically opposes the two to generate a periodic magnetic field change. As a result, in the film formation technology using the magnet roller 20 as a magnetic field generating means, it is possible to easily separate the electrode particles E electrostatically bound to the carrier C from the carrier C. In other words, it is possible to improve the film formation efficiency. Furthermore, in this configuration, by adjusting the shape, number, and size of the magnets provided in the repulsive magnetic pole member 60, the backup roller 50 can be made smaller.

[0095] The present disclosure is not limited to the above-mentioned embodiment, and can be realized in various configurations without departing from the spirit of the present disclosure. For example, the technical features of the embodiments corresponding to the technical features in each aspect described in the Summary of the Invention can be appropriately replaced or combined to solve some or all of the above-mentioned problems or to achieve some or all of the above-mentioned effects. Furthermore, if a technical feature is not described as essential in this specification, it can be appropriately deleted. [Explanation of symbols]

[0096] 1...electrostatic film forming apparatus, 2...supply section, 3...film forming section, 4...recovery section, 5...adjustment section, 6...fixing section, 7...control device, 18...base, 20...magnet roller, 21...magnetic pole member, 21a...magnetic pole member main body, 22...second shaft section, 25...regulation member, 30...cylindrical member, 31...cylindrical member main body, 32...first shaft section, 33...first support member, 50...backup roller, 51...backup roller main body, 52...third shaft section, 53...third support member, 60...repulsion magnetic pole member, 60a...repulsion magnetic pole member main body, 62...fourth shaft section, 68...film-forming surface, 80...ground member, 200...mixture storage chamber, 201...communication port, 211...first supply chamber, 212...second supply chamber, 213...third supply chamber, 215...first wall portion, 216...second wall portion, 217...third wall portion, 218...fourth wall portion, 221...first rotor, 222...second rotor, 223...third rotor, 300...flying area, 410...discharge member, 420...recovery chamber, 510...thickness correction member, 520...pressure member, 530...sensor, 540...carrier removal device, 610, 620...fixing roller, C...carrier, E...electrode particle, E1...flying electrode particle, EC...mixture, F...foil, I...pre-molded electrode, N...repulsion magnetic pole, N1...pumping magnetic pole, N2...opposing magnetic pole, N3...detachment magnetic pole, O1...cylinder rotation shaft, O3...backup roller rotation shaft, O4...repulsion magnetic pole rotation shaft, S1...first conveying magnetic pole, S2...second conveying magnetic pole

Claims

1. An electrostatic deposition apparatus, a magnet roller having magnetic poles, which attracts, by magnetic force, a magnetic carrier having electrode particles attached thereto as a film-forming material; a backup roller provided at a distance from the magnet roller, the backup roller having a film-forming surface on which the electrode particles separated from the carrier are formed; An electrostatic film forming apparatus, wherein a repulsive magnetic pole member having a repulsive magnetic pole that repels the magnetic pole of the magnet roller is provided inside the backup roller, the repulsive magnetic pole member causing a magnetic field change in a flight area located between the magnet roller and the backup roller.

2. 2. The electrostatic deposition apparatus according to claim 1, The magnet roller includes a cylindrical member that attracts the carrier to which the electrode particles are attached, and a magnetic pole member provided inside the cylindrical member and having the magnetic pole; The repulsive magnetic pole member is configured to be rotatable so that the magnetic pole and the repulsive magnetic pole periodically face each other.

3. 3. The electrostatic deposition apparatus according to claim 2, The electrostatic film forming apparatus, wherein the number of times that the magnetic pole and the repelling magnetic pole face each other per second is 20 times or more and 270 times or less.

4. 4. The electrostatic deposition apparatus according to claim 1, The backup roller has a rotation shaft, The repelling magnetic pole member is located inside the electrostatic film forming apparatus between the rotating shaft and the magnet roller.

5. An electrostatic deposition method, comprising: (a) a step of attracting a magnetic carrier having electrode particles, which are a film-forming material, to a magnet roller by a magnetic force of a magnetic pole; (b) separating the electrode particles from the carrier and attaching the electrode particles to a film-forming surface of a backup roller, The process (b) includes a process of vibrating the carrier by generating a magnetic field change in a flight region located between the magnet roller and the backup roller using a repulsive magnetic pole that repels the magnetic pole inside the backup roller, thereby electrostatically forming a film.

Images