JPH1179455A - Medium carrying device and manufacture therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an environmental characteristic, particularly, a moisture resistant characteristic by arranging a moistureproof layer to cover a base material and the whole insulating layer on a fixing piece. SOLUTION: A fixing piece 1 of a medium carrying device has a base material 11, a belt-like electrode 12 and an insulating layer 13, and a moistureproof layer 14 is also arranged. Here, in the moistureproof layer 14, a surface of the fixing piece 1 is coated with a silicone resin for the purpose of moistureproof processing. That is, after the silicone resin is diluted with toluene being a main solvent, vacuum defoaming processing is performed. The moistureproof layer 14 is also formed in a thickness of about 40 μm by a soaking method in a low humidity atmosphere on the fixing piece 1 sufficiently dried by preheating it to 40 deg.C or more. Therefore, reduction in medium carrying force can be ignored even in a high humidity environment such as rainy season time. When the moistureproof layer 14 is formed, a special technology is not required, and a cost increase necessary to improve moisture resistance of the medium carrying device can be restrained to the minimum extent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medium transport device used for transporting paper and other media to various parts of a copying machine, a printer, a facsimile, an automatic cash dispensing device, and the like.

[0002]

2. Description of the Related Art Heretofore, as a medium transfer device used for a copying machine, a printer, a facsimile, an automatic cash dispenser, and the like, a medium transfer device driven by a rotary electromagnetic motor using a rubber roller has been generally used. However, this device
The problem is that the power consumption of the rotary electromagnetic motor itself is large and the amount of heat generated is also large. Furthermore, since a rotary electromagnetic motor and a large number of rubber rollers are arranged inside the apparatus, there is a limit to the size and size of the apparatus.

[0003] In order to improve these problems,
In recent years, technical development of a medium transport device using an electrostatic actuator is in progress. This technique is described in, for example,
No. 859778]. This device is composed of a stator having a strip electrode inside an insulating layer and a moving element also having a strip electrode inside the insulating layer. A DC voltage is applied to the strip electrodes of both the stator and the mover, and the mover is moved by using an electrostatic force generated between the two strip electrodes.

[0004]

By the way, the medium conveying apparatus using the above-mentioned electrostatic actuator has the following problems to be solved. The transport force of this device is proportional to the amount of positive and negative electrostatic charges generated on the insulator surface by dielectric polarization. The charge amount largely depends on the insulation resistance value of the insulating material forming the insulating layer around the base material of the stator and the strip electrodes. On the other hand, the insulation resistance value of this insulating material greatly depends on environmental characteristics, particularly, moisture resistance characteristics. Therefore, in a high humidity environment such as during the rainy season, there is a problem to be solved that the medium conveyance force is significantly reduced.

[0005]

The present invention adopts the following constitution in order to solve the above points. <Configuration 1> A predetermined electrostatic force is applied to an object to be conveyed along the conveyance path,
It has a stator that conveys it in a predetermined direction.
A medium transport device comprising: a plurality of strip electrodes formed on a base; an insulating layer covering the strip electrodes on the base; and a moisture-proof layer covering the entire base and the insulating layer.

<Structure 2> A plurality of band-shaped electrodes are formed on a base material when a stator to be conveyed in a predetermined direction is applied by applying a predetermined electrostatic force to an object to be conveyed along a conveyance path. Then, an insulating layer is formed on the base material so as to cover the strip-shaped electrodes, dried, and then heated to 40 ° C. or more in a low humidity atmosphere, and the ratio of the silicon-based resin to the solvent is reduced to 70% by weight. A method for manufacturing a medium transporting device, comprising diluting at not less than 90% by weight and immersing in a vacuum-defoamed material to form a moisture-proof layer.

<Structure 3> There is provided a stator for applying a predetermined electrostatic force to a transfer object transferred on a transfer path and transferring the object in a predetermined direction, and the stator includes a plurality of stators formed on a base material. A belt-like electrode, and a moisture-proof layer covering the whole of the substrate and the band-shaped electrode on the substrate.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 is a configuration diagram of the first specific example. Before describing the medium transport apparatus according to the present invention, an electrostatic actuator, which is a main part of the medium transport apparatus, will be described with reference to the drawings to facilitate understanding of the invention.

(Structure of Electrostatic Actuator) FIG. 2 is a perspective view of the electrostatic actuator. The electrostatic actuator includes a stator 1 and a transport medium 2. The stator 1 includes a base material 11, a strip electrode 12, and an insulating layer 13. The base material 11 is an insulator, and glass, an epoxy resin, a fluorine resin, a fiber-mixed resin, a polyimide resin, or the like can be used.

The strip electrode 12 may be made of a conductive material such as gold, silver and copper. After electroless plating, foil bonding, etc., on the base material 11, it is formed by etching or the like. The electrode pitch and electrode width depend on the purpose of this electrostatic actuator,
Designed according to the application. Further, the plurality of strip electrodes 12
The three phases are separately connected. After that, each of the three phases is A
Phases, B phase and C phase, and the electrodes connected to A phase are 12
The electrode connected to the A and B phases is referred to as 12B, and the electrode connected to the C phase is referred to as 12C.

The insulating layer 13 is applied to the electrode surface and side surfaces for the purpose of insulating the strip electrodes 12 from each other. It is formed by coating an insulating resin, for example, a fluorine-based resin, or by bonding a polyimide film. The thickness is arbitrary, but if the thickness is too large, the conveying force is weakened. On the other hand, if the thickness is too small, air discharge easily occurs. Therefore, an appropriate design according to the purpose and application is required. The transport medium 2 means paper sheets such as paper and bills, cards such as cash cards and prepaid cards, and all other media transported by the medium transport apparatus according to the present invention. Next, the operation of the electrostatic actuator will be described.

(Operation of Electrostatic Actuator) FIGS. 3 and 4
FIG. 4 is an explanatory diagram of the operation of the electrostatic actuator. In order to facilitate understanding of the operation, one transport medium 2 is subdivided and described as 2A1 to 2B3, respectively. Further, the plurality of strip electrodes 12 are connected to each other in three phases, the electrodes connected to the A phase are 12A1 to 12A4, and the electrodes connected to the B phase are
B1 to 12B4, electrodes connected to the C phase are 12C1 to 1
Recorded as 2C4. Further, the electrostatic force is represented by a solid line (suction force) and a dotted line (repulsive force). When the electrostatic force acts in the transport direction of the transport medium 2 (from left to right in the figure), a circle is put on the solid line or the dotted line, and when it acts in the opposite direction to the transport direction, a cross is placed.

(A) shows the operation of the initial polarization. The initial polarization is an operation of generating an electrostatic charge on the surface of the transport medium 2 at the beginning of the operation of the electrostatic actuator. A negative voltage is applied to the A phase, a positive voltage is applied to the B phase, and a positive voltage is applied to the C phase. Hereinafter, the negative voltage is represented by N, the positive voltage is represented by P, and the 0 voltage is represented by G, and the state (a) is described as (N, P, P). Strip electrodes 12A1 to 12C4
When a DC voltage (N, P, P) is applied to the medium, the DC voltage causes dielectric polarization inside the carrier medium 2 and generates an electrostatic charge on the surface of the medium opposite to the band electrodes 12A1 to 12C facing each other. . Since the transport medium 2 is an insulator, the generated electrostatic charges are charged on the subdivided media 2A1 to 2B3 while maintaining their polarities.

In this state, the divided media 2A1 to 2B
The electrostatic force acts between the electrostatic charge charged to No. 3 and the electrostatic charge accumulated on the strip electrodes 12A1 to 12C4 as follows. A strong suction force acts between the subdivided media 2A1 to 2B3 and the opposing strip electrodes 12A1 to 12B3 in a direction to attract the transport medium 2 to the stator 1. At the same time, between the subdivided medium 2A1 and the strip electrodes 12B1, between the subdivided medium 2C1 and the strip electrodes 12B1 and 12A2,
Between the subdivided medium 2A2 and the strip electrode 12B2, between the subdivided medium 2C2 and the strip electrodes 12B2 and 12A3, between the subdivided medium 2A3 and the strip electrode 12B3,
A force acts on the transport medium 2 in a direction opposite to the transport direction.

Further, the subdivided medium 2B1 and the strip electrode 1
2A1 and 12C1, between the subdivided medium 2A2 and the strip electrode 12C1, between the subdivided medium 2B2 and the strip electrodes 12A2 and 12C2, between the subdivided medium 2A3 and the strip electrode 12C2, A force in the transport direction acts on the transport medium 2 between 2B3 and the strip electrode 12A3. However, as described above, since the strong suction force acts in the direction in which the transport medium 2 is attracted to the stator 1, the transport medium 2 remains at the same position.

(B) DC voltages (P, N, G) are applied to the strip electrodes 12A1 to 12C4. Subdivided medium 2A
Strip-shaped electrodes 12A1 to 12B3 respectively facing 1 to 2B3
A strong repulsive force acts in the direction in which the transport medium 2 floats from the stator 1. At the same time, between the subdivided medium 2A1 and the strip electrode 12B1, between the subdivided medium 2C1 and the strip electrode 12B1.
B1 and 12A2, between the subdivided medium 2A2 and the strip electrode 12B2, and between the subdivided medium 2C2 and the strip electrode 1
2B2 and 12A3, and between the subdivided medium 2A3 and the strip electrode 12B3, a force acts on the transport medium 2 in the transport direction.

Further, the subdivided medium 2B1 and the strip electrode 1
2A1, the subdivided medium 2B2 and the strip electrode 12A
2, and between the subdivided medium 2B3 and the strip electrode 12A3, a force acts on the transport medium 2 in the direction opposite to the transport direction. In this state, the number of forces (indicated by a circle) in the transport direction with respect to the transport medium 2 is greater than the force (indicated by a cross) in the direction opposite to the transport direction with respect to the transport medium 2. No. 2 moves by one pitch of the strip electrode 12, and reaches (c).
In the state (c), a strong suction force acts between the subdivided media 2A1 to 2B3 and the opposing strip electrodes 12B1 to 12C3 in a direction to attract the transport medium 2 to the stator 1.
Therefore, the force in the transport direction on the transport medium 2 (marked by ○)
Irrespective of the magnitude of the number, the transport medium 2 remains at the same position.

Next, the process proceeds to (d), in which the strip electrodes 12A1 to 12A1
DC voltage (G, P, N) is applied to 12C4. The strip-shaped electrodes 12 respectively facing the subdivided media 2A1-2B3.
A strong repulsive force acts between B1 and 12C3 to lift the transport medium 2 from the stator 1. At the same time, between the subdivided medium 2A1 and the strip electrode 12C1, the subdivided medium 2C1
Between the strip-shaped electrodes 12C1 and 12B2, between the segmented medium 2A2 and the strip-shaped electrodes 12C2,
2 and the strip electrodes 12C2 and 12B3, and between the subdivided medium 2A3 and the strip electrodes 12C3, a force acts on the transport medium 2 in the transport direction.

Further, the subdivided medium 2B1 and the strip electrode 1
2B1, the divided medium 2B2 and the strip electrode 12B
2, a force in the direction opposite to the transport direction acts on the transport medium 2 between the subdivided medium 2B3 and the strip electrode 12B3. In this state, the number of forces (indicated by a circle) in the transport direction with respect to the transport medium 2 is greater than the force (indicated by a cross) in the direction opposite to the transport direction with respect to the transport medium 2. No. 2 moves by one pitch of the strip electrode 12 to reach (e).
In the state of (e), a strong suction force acts between the subdivided media 2A1 to 2B3 and the opposing strip electrodes 12C1 to 12A4 in a direction in which the transport medium 2 is attracted to the stator 1.
Therefore, the force in the transport direction on the transport medium 2 (marked by ○)
Irrespective of the magnitude of the number, the transport medium 2 remains at the same position.

Next, the process proceeds to (f), in which the strip electrodes 12A1 to 12A1
DC voltage (N, G, P) is applied to 12C4. The strip-shaped electrodes 12 respectively facing the subdivided media 2A1-2B3.
A strong repulsive force acts between C1 and 12A4 in a direction that causes the transport medium 2 to float from the stator 1. At the same time, between the subdivided medium 2A1 and the strip electrode 12A2, the subdivided medium 2C1
Between the strip-shaped electrodes 12A2 and 12C2, between the subdivided medium 2A2 and the strip-shaped electrodes 12A3,
2 and the strip electrodes 12A3 and 12C3, and between the subdivided medium 2A3 and the strip electrodes 12A4, a force acts on the transfer medium 2 in the transfer direction.

Further, the subdivided medium 2B1 and the strip electrode 1
2C1, the subdivided medium 2B2 and the strip electrode 12C
2, a force in the direction opposite to the transport direction acts on the transport medium 2 between the subdivided medium 2B3 and the strip electrode 12C3. In this state, the number of forces (indicated by a circle) in the transport direction with respect to the transport medium 2 is greater than the force (indicated by a cross) in the direction opposite to the transport direction with respect to the transport medium 2. 2 moves the strip-shaped electrode 12 by one pitch. Thereafter, the same operation is repeated, and the transport medium 2 moves in the transport direction. This is the end of the description of the electrostatic actuator. Returning to FIG. 1 again, the medium transport device according to the present invention will be described.

<Structure of Embodiment 1> FIGS. 1A and 1B
More specifically, the medium transport device according to the specific example 1 includes the stator 1, the transport medium 2, the power supply 5, the driving unit 6, and the control unit 7. Here, the transport medium 2 can be understood as an accessory of the medium transport apparatus. However, in the present invention, the transport medium 2 is treated as a component in the description of the operation. The stator 1 includes the base material 11, the strip electrodes 12, and the insulating layer 13, as described in the configuration of the electrostatic actuator. Further, the specific example 1 includes a moisture-proof layer 14 in addition to the above components. Epoxy resin was used as the base material 11. This is for giving a degree of freedom in designing the thickness and the like. The strip electrode 12 was formed using a copper electrode at an electrode pitch of 0.4 mm and an electrode width of 0.1 mm. As the insulating layer 13, a solder resist was coated to a thickness of about 40 μm.

The moisture-proof layer 14 is a moisture-proof material coated on the surface of the stator 1 for the purpose of moisture-proof treatment. A resin having good moisture resistance such as a fluorine resin, a silicon resin, and an epoxy resin can be used. In this specific example, a silicon-based resin was used. At the time of forming the moisture-proof layer 14, it is necessary to pay attention that unevenness does not occur on the surface and that there are no bubbles inside, and it is necessary to adjust the viscosity at the time of formation. Therefore, the silicon-based resin was diluted with toluene as a main solvent, and then subjected to vacuum defoaming treatment. Further, the stator 1 previously heated to 40 ° C. or more and sufficiently dried is placed under a low humidity atmosphere.
It was formed to a thickness of about 40 μm by an immersion method. As a result of various experiments, to obtain a film with a thickness of several tens of μm by the immersion method,
70% to 9% of silicone resin with toluene as main solvent
It was determined that it was necessary to dilute to 0%. It was experimentally confirmed that by these operations, it was possible to form a moisture-proof layer having no irregularities on the surface and not enclosing bubbles.

The transport medium 2 includes paper sheets such as paper and bills,
It refers to cards such as cash cards and prepaid cards, and all other media transported by the media transport device according to the present invention. The power supply 5 is a power supply that supplies a DC voltage to be applied to the strip-shaped electrode 12, and includes a positive voltage, a negative voltage,
It has three outputs of zero voltage (ground voltage). Drive unit 6
Changes the output of the power supply 5 to each of the A phase, the B phase, and the C phase,
This is a part that switches and supplies a positive voltage, a negative voltage, and a zero voltage (ground voltage). The control section 7 is a section that performs phase switching of the drive section 6. Control of the transport direction, transport speed, and the like is performed by this phase switching.

<Operation of Embodiment 1> As shown in FIG. 1A, it is assumed that the transport medium 2 is placed on the stator 1 and the transport is started. (B) is a configuration diagram showing connections and positional relationships among the stator 1, the transport medium 2, the power supply 5, the drive unit 6, and the control unit 7 for explaining the subsequent operation. The drive unit 6 applies a DC voltage (N, P, P) to the strip electrode 12 under the control of the control unit 7 at the start of the transport.

The charge accumulated on the strip electrode 12 by the DC voltage (N, P, P) charges the oppositely charged electrostatic charge at the position of the transport medium 2 facing the electrode.
Thereafter, based on the control of the control unit 7, the drive unit 6 changes the polarity of the DC voltage to (P, N, G), (G, P, N), (N, G,
Each time the mode is switched to P), the transport medium 2 is transported by one pitch of the strip electrode. This operation is exactly the same as the operation already described for the operation of the electrostatic actuator.

In this case, the polarity of the DC voltage is changed in three stages of transport patterns (P, N, G), (G, P, N), (N,
G, P), but it is not necessary to stick to this pattern. The transfer medium 2 can be changed in accordance with the purpose and use of the transfer medium device, including the forward and backward movements of the transfer medium 2 and the transfer speed.

In this embodiment, the transport medium 2 is directly placed on the stator 1 and transported. However, a movable element made of an insulator is provided, and the transport medium 2 is placed on the movable element and It is also possible to carry them together. The object to be transported is defined as including the transport medium 2 and the moving element.

Further, in this embodiment, the explanation has been made by taking the example of the substrate-like linear transfer device. However, it is also possible to manufacture the stator 1 on a film-like flexible substrate or the like.
Therefore, a medium transport device having a curved curved transport path can be easily realized. Next, a description will be given of a demonstration experiment on the moisture resistance characteristics of the transport medium device according to this example.

(Demonstration Experiment on Moisture Resistance Characteristics of Conveying Medium Device According to Specific Example 1) Demonstration experiment (a), stator 1 (FIG. 1)
A medium transport device A having a moisture barrier layer 14 and a media transport device B having no moisture barrier layer 14 in the stator 1 (FIG. 1) are continuously manufactured for 10 minutes in an indoor environment before humidification. The reciprocating conveyance operation was performed, and the operation state was measured. As a result, it was confirmed that both were completely unusual. In the verification experiment (b), the above A and B were left in a constant temperature and humidity chamber at 40 ° C. and 95%, and the above measurements were made every day. As a result, it was confirmed that B did not operate at all after 3 days, but A did not deteriorate after 10 days.

As the above criterion, the arrival rate was emphasized. The arrival rate is a value obtained by dividing the number of pitches actually moved by a theoretical value. In the above (a), both A and B are 95 to 10
Although it was 0%, in the above (b), B decreased to 20% or less after 3 days, and A was 95% even after 10 days.
The above was maintained.

<Effect of Specific Example 1> The medium transport device according to the specific example 1 has the following effects by providing the stator 1 with the moisture-proof layer 14 made of a silicone resin coating. 1. Environmental properties, especially humidity resistance, have been greatly improved. Therefore, even in a humid environment such as during the rainy season, the decrease in the medium conveyance force can be ignored. 2. Since no special technique is required for forming the moisture-proof layer 14, the cost increase required for improving the moisture-resistant characteristics of the medium transport device can be minimized.

3. The movement of the object to be conveyed on the stator 1 has been improved due to the good sliding characteristic of the silicone resin. Further, the moisture-proof layer 14 is previously diluted to 70% to 90% with a solvent in a low-humidity atmosphere, and dried on a vacuum-defoamed silicone resin by heating to 40 ° C. or more in advance. The following effects were obtained by forming by dipping.

4. Since the thickness of the moisture-proof layer 14 can be made thin and uniform, a decrease in the transport force due to the moisture-proof layer 14 could be ignored. 5. The moisture-proof layer 14 could be formed without unevenness, and the silicone resin was well immersed in bubbles, scratches, etc. on the stator surface, so that a film with high adhesive strength could be formed.

<Embodiment 2> FIG. 5 is a block diagram of Embodiment 2. As shown in the figure, the medium transport device according to the second embodiment includes a stator 3, a transport medium 2, a power supply 5, a driving unit 6, and a control unit 7. Here, the transport medium 2 can be understood as an accessory of the medium transport apparatus. However, in the present invention, the transport medium 2 is treated as a component in the description of the operation. What is different from the specific example 1 is the stator 3
Only the others are the same as in the first embodiment. Only the differences from the specific example 1 will be described.

The stator 3 comprises a base material 11 and a strip electrode 12.
And an insulating moisture-proof layer 15. Stator 1 according to specific example 1
The difference is that the insulating moisture-proof layer 15 is provided instead of the insulating layer 13 (FIG. 1) in the first embodiment. Further, it does not have the moisture-proof layer 14 (FIG. 1). Others are the same as the stator 1 of the specific example 1. The insulating moisture-proof layer 15 includes the strip-shaped electrode 12.
It is a moisture-proof material that also serves as an insulating material, coated on the surface of the base material 11. Resins having good moisture resistance and high insulating properties, such as a fluorine-based resin, a silicon-based resin, and an epoxy-based resin, can be used.

In this example, a silicon-based resin was used. At the time of forming the insulating and moisture-proof layer 15, it is necessary to pay attention that no irregularities are generated on the surface and that there are no bubbles inside, and a proper viscosity is required at the time of formation. Therefore, the silicon-based resin was diluted with toluene as a main solvent, and then subjected to vacuum defoaming treatment. Further, the substrate 11 having a sufficiently dried band electrode 12 was formed to a thickness of about 80 μm by a dipping method in a low humidity atmosphere. At this time, there is no problem even if the silicon-based resin adheres not only to the band-shaped electrode 12 side of the base material 11 but also to the back side thereof.

The operation of the embodiment 2 is exactly the same as the operation of the embodiment 1. Further, it was confirmed by the demonstration experiment described below that the same characteristics were exhibited. Next, a verification experiment on the moisture resistance characteristics of the transport medium device according to the specific example 2 will be described.

(Demonstration Experiment on Moisture Resistance Characteristics of Conveying Medium Device According to Specific Example 2) Demonstration experiment (c), stator 3 (FIG. 5)
Transport device C provided with an insulating and moisture-proof layer 15 on the stator 1
Transport device D having no moisture barrier 14 (Demonstration experiment a,
b), and both of them were subjected to a continuous reciprocating transport operation for 10 minutes in an indoor environment before humidification, and the operating state was measured. As a result, it was confirmed that both were completely unusual.

Demonstration experiment (d), C and D at 40 ° C. 95
% In a constant temperature / humidity bath, and the above measurement was carried out every day. As a result, it was confirmed that D did not operate at all after 3 days, but C did not deteriorate after 10 days.

As the above judgment items, emphasis was placed on the arrival rate. The arrival rate is a value obtained by dividing the number of pitches actually moved by a theoretical value. In the above (c), both C and D are 95 to 10
Although it was 0%, in the above (d), D decreased to 20% or less after 3 days, and C was 95% even after 10 days.
The above was maintained. Demonstration experiment (c), demonstration experiment (d)
Confirmed that the results showed exactly the same as those of the verification experiment (a) and the verification experiment (b).

<Effects of Specific Example 2> The medium transport device according to Specific Example 2 has the following effects by providing the stator 3 with the insulating and moisture-proof layer 15 made of a silicon-based resin coating. 1. Since the two steps of forming the insulating layer 13 and the moisture-proof layer 14 according to the specific example 1 can be combined with one step of forming the insulating and moisture-proof layer 15, the cost required for improving the moisture-proof characteristics of the medium transport device can be increased. It has become possible to further down. 2. Further, it is possible to maintain all the effects of the first embodiment.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a specific example 1.

FIG. 2 is a perspective view of an electrostatic actuator.

FIG. 3 is an operation explanatory view (part 1) of the electrostatic actuator.

FIG. 4 is an operation explanatory view (part 2) of the electrostatic actuator.

FIG. 5 is a configuration diagram of a specific example 2.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator 2 Conveying medium 5 Power supply 6 Drive part 7 Control part 11 Base material 12 Strip electrode 13 Insulation layer 14 Moisture-proof layer

Claims (3)

[Claims] An object to be conveyed along a conveying path is provided with a stator for applying a predetermined electrostatic force to the object to be conveyed in a predetermined direction. The stator includes a plurality of strips formed on a base material. A medium transport device, comprising: an electrode; an insulating layer covering the strip electrode on the substrate; and a moisture-proof layer covering the entire substrate and the insulating layer. 2. A method of manufacturing a stator, which applies a predetermined electrostatic force to an object to be conveyed along a conveyance path and conveys the object in a predetermined direction, comprises forming a plurality of strip-shaped electrodes on a base material; An insulating layer is formed on the base material so as to cover the strip electrodes, dried, and heated in a low-humidity atmosphere to 40 ° C. or more. A method for manufacturing a medium transporting device, comprising diluting at a concentration of not more than weight% and immersing in a vacuum degassed product to form a moisture-proof layer. 3. A method according to claim 1, further comprising the step of applying a predetermined electrostatic force to an object to be conveyed along the conveying path to convey the object in a predetermined direction. The stator includes a plurality of strips formed on a base material. A medium transport device, comprising: an electrode; a strip electrode on the substrate; and a moisture-proof layer covering the entire substrate.