Drying apparatus and recording apparatus

Abstract

The invention provides a drying device and a recording device which can restrain large size of the drying device. Each of the plurality of electromagnetic wave generating units dries the medium on which the liquid has been discharged by generating electromagnetic waves in accordance with the application of the high-frequency voltage. Each of the plurality of electromagnetic wave generating sections has: a first electrode; a second electrode surrounding the first electrode when viewed in a plane from a first direction toward the medium; a first conductor having a coil and electrically connecting a transmission line capable of transmitting a high-frequency voltage to the first electrode; and a second conductor electrically connecting the transmission line and the second electrode. The first metal plate is disposed at a position between the first electromagnetic wave generation unit and the second electromagnetic wave generation unit in the second direction with respect to the plurality of electromagnetic wave generation units across the medium in the first direction, and extends along the first direction. The first metal plate is electrically connected to the second electrode of the first electromagnetic wave generating unit and the second electrode of the second electromagnetic wave generating unit.

Description

Technical Field

[0001] This invention relates to a drying apparatus and a recording apparatus. Background Technology

[0002] For example, Patent Document 1 discloses a liquid ejection device equipped with a drying apparatus for drying a medium from which liquid has been ejected. To improve drying efficiency, such a drying apparatus includes multiple alternating current (AC) field generating units that generate electromagnetic waves relative to the medium after the liquid has been ejected, thereby drying the medium. One example of such an AC field generating unit is an electromagnetic wave generating unit that generates electromagnetic waves relative to the medium by supplying a high-frequency voltage between a first electrode and a second electrode. This enables the drying of the medium from which the liquid has been ejected.

[0003] However, in such a drying apparatus, when multiple electromagnetic wave generating units are configured, these units need to be isolated from each other to avoid interference from alternating electric fields. Therefore, this may lead to an increase in the size of the drying apparatus.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2022-39286 Summary of the Invention A drying apparatus for solving the above-mentioned problems includes: a plurality of electromagnetic wave generating units that generate electromagnetic waves by applying a high-frequency voltage to dry a medium from which liquid has been sprayed; a first metal plate, wherein each of the plurality of electromagnetic wave generating units has: a first electrode; a second electrode configured to surround the first electrode when viewed from a plane in a first direction toward the medium; a first conductor having a coil and electrically connecting a transmission line capable of transmitting a high-frequency voltage to the first electrode; and a second conductor electrically connecting the transmission line to the second electrode. The plurality of electromagnetic wave generating units have a first electromagnetic wave generating unit and a second electromagnetic wave generating unit, which are arranged in a second direction intersecting the first direction. The first metal plate is configured to be positioned in the first direction relative to the plurality of electromagnetic wave generating units, separated by the medium, and in the second direction between the first and second electromagnetic wave generating units, and is configured to extend along the first direction, and is electrically connected to the second electrode of both the first and second electromagnetic wave generating units.

[0005] A recording apparatus for solving the above-mentioned problems includes: a recording unit that records by spraying liquid onto a medium; a plurality of electromagnetic wave generating units that generate electromagnetic waves by applying a high-frequency voltage, thereby drying the medium onto which liquid has been sprayed through the recording unit; a first metal plate, wherein each of the plurality of electromagnetic wave generating units has: a first electrode; a second electrode configured to surround the first electrode when viewed from a plane in a first direction toward the medium; a first conductor having a coil and electrically connecting a transmission line capable of transmitting high-frequency voltage to the first electrode; and a second conductor electrically connecting the transmission line to the second electrode. The plurality of electromagnetic wave generating units have a first electromagnetic wave generating unit and a second electromagnetic wave generating unit. The first electromagnetic wave generating unit and the second electromagnetic wave generating unit are arranged in a second direction intersecting the first direction. The first metal plate is configured to be positioned in the first direction relative to the plurality of electromagnetic wave generating units and separated by a medium, and in the second direction between the first electromagnetic wave generating unit and the second electromagnetic wave generating unit. It is configured to extend along the first direction and is electrically connected to the second electrode of the first electromagnetic wave generating unit and the second electrode of the second electromagnetic wave generating unit. Attached Figure Description

[0006] Figure 1 This is a schematic diagram illustrating the recording system of the first embodiment.

[0007] Figure 2 This is a perspective view showing the drying unit of the first embodiment.

[0008] Figure 3 This is a schematic diagram illustrating the drying unit of the first embodiment.

[0009] Figure 4 This is a schematic diagram illustrating the drying unit of the first embodiment.

[0010] Figure 5 This is a schematic diagram illustrating the drying unit of the first embodiment.

[0011] Figure 6 This is a schematic diagram illustrating a modified drying unit. Detailed Implementation

[0012] First Implementation Method The following describes one embodiment of a recording system including a drying device and a recording device. In this description, the direction intersecting the vertical direction Z is defined as the width direction X, and the direction intersecting both the vertical direction Z and the width direction X is defined as the intersection direction Y. One direction along the width direction X is defined as the first width direction X1, and the other direction along the width direction X is defined as the second width direction X2. One direction along the intersection direction Y is defined as the first intersection direction Y1, and the other direction along the intersection direction Y is defined as the second intersection direction Y2. The upper part of the vertical direction Z is defined as the upper Z1, and the lower part of the vertical direction Z is defined as the lower Z2. The lower Z2 corresponds to an example of the first direction. The width direction X corresponds to an example of the second direction. The intersection direction Y corresponds to an example of a third direction. The first intersection direction Y1 corresponds to an example of one side of the third direction, and the second intersection direction Y2 corresponds to an example of the other side of the third direction. Planar views taken from the upper Z1 are only represented as top-down views. Planar views taken from the second width direction X2 are only represented as front-view views.

[0013] Structure of Recording System 10 like Figure 1 As shown, the recording system 10 is a system for performing recording on a medium 90. Specifically, the recording system 10 is a system for performing recording on a medium 90 by spraying liquid onto the medium 90. The recording system 10 is also a system for drying the medium 90 after the liquid has been sprayed out during recording.

[0014] The recording system 10 includes a recording device 11. The recording device 11 is configured to perform recording on a medium 90. Specifically, the recording device 11 performs recording on the medium 90 by spraying liquid onto the medium 90. The recording device 11 can also be an inkjet printer that performs recording by spraying ink, an example of a liquid, onto the medium 90. The medium 90 has a front surface 90A and a back surface 90B. The medium 90 is cloth, but it can also be, for example, paper.

[0015] The recording system 10 includes a drying device 12. The drying device 12 is configured to dry the recorded medium 90 from which the liquid was ejected by the recording device 11. In particular, the drying device 12 dries the recorded medium 90 by generating electromagnetic waves.

[0016] The recording system 10 includes a feed unit 13. The feed unit 13 unwinds the medium 90, which is to be recorded, onto the recording device 11. The feed unit 13 includes a feed roller 13A. The feed roller 13A is provided to extend along the width direction X. In the width direction X, the width of the feed roller 13A is longer than the width of the medium 90. The feed roller 13A is configured to rotatably hold a first roll 91. The first roll 91 is the medium 90, which is to be wound and is to be recorded. The medium 90 may also be a strip. In this way, the feed roller 13A holds the medium 90 being unwound toward the recording device 11.

[0017] The recording system 10 includes a take-up section 14. The take-up section 14 takes up the recorded medium 90 that has been recorded by the recording device 11. In particular, the take-up section 14 takes up the recorded medium 90 that has been dried by the drying device 12. The take-up section 14 includes a take-up roller 14A. The take-up roller 14A is provided to extend along the width direction X. In the width direction X, the width of the take-up roller 14A is longer than the width of the medium 90. The take-up roller 14A is configured to rotatably hold a second roll 92. The second roll 92 is the recorded medium 90 that has been wound. In this way, the take-up roller 14A takes up the medium 90 that has been recorded by the recording device 11 and dried by the drying device 12.

[0018] Structure of recording device 11 Here, the structure of the recording device 11 will be described in detail.

[0019] The recording apparatus 11 includes a recording unit 20, a recording support unit 21, and a recording transport unit 22. The recording unit 20 is configured to record on the medium 90 by spraying liquid onto the medium 90. The recording unit 20 is configured to record on the medium 90 by spraying liquid onto the surface 90A of the medium 90. The recording unit 20 records on the medium 90 supported by the recording support unit 21. The recording unit 20 records on the medium 90 transported by the recording transport unit 22.

[0020] The recording unit 20 includes a head 23. The head 23 can be a serial head or a line head. A serial head is a head that scans along the width direction X of the medium 90. A line head is a head that records simultaneously across the width direction X of the medium 90.

[0021] The head 23 has a nozzle surface 24 with multiple nozzles (not shown) opening. The nozzle surface 24 faces downward Z2. The nozzle surface 24 faces the surface 90A of the medium 90 being transported by the recording and transport unit 22. The multiple nozzles are configured to open downward Z2. The multiple nozzles are configured to eject liquid.

[0022] The recording unit 20 may also include a carriage 25 and a carriage support 26. The carriage 25 is configured to support the head 23. The carriage support 26 extends along the width direction X. The carriage support 26 supports the carriage 25 in a manner that allows it to move along the width direction X. The carriage 25 can move along the carriage support 26 in the width direction X by a driving force from a drive source (not shown).

[0023] The recording support 21 is configured to support the medium 90 being transported by the recording transport unit 22. The recording support 21 is located Z2 below the recording unit 20. The recording support 21 supports the back surface 90B of the medium 90 being transported by the recording transport unit 22. The recording support 21 is located Z2 below the head 23.

[0024] The recording conveying unit 22 is configured to convey the medium 90 in the conveying direction D. The conveying direction D is along the intersecting direction Y. The recording conveying unit 22 may also have multiple rollers. The recording conveying unit 22 uses multiple rollers to convey the medium 90 in the conveying direction D, but it may also use a conveyor belt driven by multiple rollers to convey the medium 90 in the conveying direction D. The recording conveying unit 22 can also perform intermittent conveying and stopping of the medium 90.

[0025] Structure of drying device 12 Next, the structure of the drying device 12 will be described in detail.

[0026] The drying apparatus 12 includes a drying unit 30. The drying unit 30 is configured to dry the recorded medium 90. In other words, the drying apparatus 12 takes the medium 90, which has been recorded by the recording unit 20, as the object to be dried.

[0027] The drying unit 30 is configured to dry the recorded medium 90 by generating electromagnetic waves. The drying unit 30 is located on both sides of the medium 90, above Z1 and below Z2.

[0028] The drying apparatus 12 includes a high-frequency voltage generating unit 31. The drying apparatus 12 may also include multiple high-frequency voltage generating units 31. The high-frequency voltage generating units 31 are configured to generate high-frequency voltage. The high-frequency voltage generating units 31 supply high-frequency voltage to the drying unit 30 via a transmission line 32.

[0029] The multiple high-frequency voltage generating units 31 can also supply high-frequency voltage independently relative to the multiple electromagnetic wave generating units 36 described later. That is, a high-frequency voltage generating unit 31 can also be connected to an electromagnetic wave generating unit 36 ​​in a paired manner.

[0030] The transmission line 32 is a line connecting the drying unit 30 and the high-frequency voltage generating unit 31. The transmission line 32 is capable of transmitting high-frequency voltage from the high-frequency voltage generating unit 31 to the drying unit 30. In other words, the transmission line 32 is capable of transmitting high-frequency voltage.

[0031] The transmission line 32 can also be a coaxial cable, but is not limited to a coaxial cable. The transmission line 32 can also have a first line and a second line. The first line can also be a core wire of the transmission line 32. The second line can also be an electromagnetic shielding component that covers the first line.

[0032] The drying apparatus 12 includes a drying conveying unit 33. The drying conveying unit 33 is configured to convey the medium 90 in a conveying direction D. The conveying direction D is along the intersecting direction Y. The drying conveying unit 33 may also use multiple rollers to convey the medium 90 in the conveying direction D. The drying conveying unit 33 can also perform continuous conveying of the medium 90. Relaxation of the medium 90 can also be achieved between the recording conveying unit 22 and the drying conveying unit 33.

[0033] The drying apparatus 12 includes a control unit 35. The control unit 35 controls the drying apparatus 12. Specifically, the control unit 35 controls the drying unit 30. The control unit 35 controls the high-frequency voltage generating unit 31. The control unit 35 controls the drying conveying unit 33.

[0034] The control unit 35 may also be composed of one or more processors that execute various processes according to a computer program. The control unit 35 may also be composed of one or more dedicated hardware circuits. The control unit 35 may also be composed of a dedicated integrated circuit that executes at least a portion of the various processes. The control unit 35 may also be composed of a circuit that includes a combination of a processor and hardware circuits. The processor includes a CPU and memories such as RAM and ROM. The memory stores program code or instructions configured to cause the CPU to execute processes. Memory, also known as computer-readable media, includes all readable media that can be accessed by a general-purpose or special-purpose computer.

[0035] The drying unit 30 includes an electromagnetic wave generating unit 36. The electromagnetic wave generating unit 36 ​​is configured to generate electromagnetic waves based on the application of a high-frequency voltage. Thus, the electromagnetic wave generating unit 36 ​​is configured to dry the medium 90 from which liquid has been ejected through the recording unit 20. The electromagnetic wave generating unit 36 ​​is located above the medium 90 at a position Z1, but is not limited to this location.

[0036] The electromagnetic wave generating unit 36 ​​generates an alternating electric field by generating electromagnetic waves. The electromagnetic waves generated by the electromagnetic wave generating unit 36 ​​are mainly composed of an electric field. Compared with ordinary electromagnetic wave generating units, the electromagnetic wave generating unit 36 ​​can minimize the induction of magnetic fields caused by the generated electric field.

[0037] To give a specific example, the electromagnetic wave generating unit 36 ​​generates electromagnetic waves of 2.4 GHz, but is not limited to this. For example, the electromagnetic wave generating unit 36 ​​can also generate electromagnetic waves of 3 MHz to 300 MHz. For example, the electromagnetic wave generating unit 36 ​​can generate electromagnetic waves of 300 MHz to 30 GHz, and can also generate electromagnetic waves of 10 MHz to 20 GHz.

[0038] The electromagnetic wave generating unit 36 ​​dries the medium 90 by heating it from the surface 90A. Specifically, the electromagnetic wave generating unit 36 ​​heats the liquid sprayed onto the medium 90 from the surface 90A. The electromagnetic wave generating unit 36 ​​dries the medium 90 by vaporizing the liquid sprayed onto the medium 90. In other words, the electromagnetic wave generating unit 36 ​​dries the medium 90 regardless of whether the water vapor surrounding the medium 90 is saturated. Therefore, the electromagnetic wave generating unit 36 ​​does not need to blow on the dried gas, which is not saturated with water vapor around the medium 90.

[0039] Configuration of multiple electromagnetic wave generating units 36 like Figure 2 As shown, the drying unit 30 includes multiple electromagnetic wave generating units 36. That is, the drying apparatus 12 includes multiple electromagnetic wave generating units 36. The multiple electromagnetic wave generating units 36 include a first electromagnetic wave generating unit 36A and a second electromagnetic wave generating unit 36B. The multiple electromagnetic wave generating units 36 may also include a third electromagnetic wave generating unit 36C. Figure 3 as well as Figure 4 The fourth electromagnetic wave generating unit 36D is shown.

[0040] Multiple electromagnetic wave generating units 36 are arranged in a manner that runs along the width direction X. That is, the first electromagnetic wave generating unit 36A and the second electromagnetic wave generating unit 36B are arranged in a manner that runs along the width direction X.

[0041] Structure of electromagnetic wave generating unit 36 The electromagnetic wave generating unit 36 ​​includes a first electrode 41, a second electrode 42, a first conductor 43, and a second conductor 44. The electromagnetic wave generating unit 36 ​​may also include an opposing part 45. Figure 2 The diagram shows the first electrode 41 and the second electrode 42 positioned on the Z1 side above the dielectric 90.

[0042] The first electrode 41 is flat, but it can also be rod-shaped. When viewed in a plane, the intersecting direction Y of the first electrode 41 becomes its length direction. That is, when viewed in a plane, the first electrode 41 is extended along the intersecting direction Y. The first electrode 41 can also be rectangular when viewed in a plane.

[0043] The first electrode 41 has a first electrode surface 41A. The first electrode surface 41A is a surface facing downward Z2. That is, the first electrode surface 41A is a surface facing the surface 90A of the medium 90. The first electrode 41 is arranged such that the first electrode surface 41A abuts against the opposing portion 45.

[0044] The first electrode 41 has a central portion 41B and two end portions 41C. The central portion 41B is located at the center in the width direction X. The two end portions 41C are located at both ends in the width direction X. The central portion 41B and the two end portions 41C are integrated.

[0045] The central portion 41B constitutes the first electrode surface 41A. The central portion 41B is disposed at a position that overlaps with the second electrode 42 in the vertical direction Z. That is, at least a portion of the first electrode 41 is disposed at a position that overlaps with the second electrode 42 in the vertical direction Z.

[0046] Both ends 41C are constructed to be inclined upward relative to the outer side of the width direction X. Both ends 41C are located at a position separated from the opposing portion 45. That is, both ends 41C are provided to extend upward Z1 in the vertical direction Z, separated from the medium 90. Both ends 41C may also be bent in a manner that separates them from the opposing portion 45.

[0047] The second electrode 42 is in the shape of a flat plate. The second electrode 42 has a second electrode surface 42A. The second electrode surface 42A is the surface facing downward Z2. That is, the second electrode surface 42A is the surface facing the surface 90A of the medium 90. The second electrode 42 is arranged such that the second electrode surface 42A abuts against the opposing portion 45.

[0048] The second electrode 42 has an opening 42B. The opening 42B is rectangular in shape when viewed in a planar view, but it can also be a rounded rectangular shape. The first electrode 41 is located at the opening 42B when viewed in a planar view. The opening 42B surrounds the first electrode 41 when viewed in a planar view. That is, the second electrode 42 is configured to surround the first electrode 41 when viewed in a planar view.

[0049] The second electrodes 42 in the multiple electromagnetic wave generating units 36 can also be shared at adjacent positions in the width direction X. Specifically, the second electrodes 42 in the second width direction X2 of the first electromagnetic wave generating unit 36A and the second electrodes 42 in the first width direction X1 of the second electromagnetic wave generating unit 36B are shared. That is, the second electrodes 42 of the first electromagnetic wave generating unit 36A and the second electrodes 42 of the second electromagnetic wave generating unit 36B are shared in the width direction X at the positions where the first electromagnetic wave generating unit 36A and the second electromagnetic wave generating unit 36B are arranged.

[0050] The first conductor 43 is configured to electrically connect the transmission line 32 to the first electrode 41. The first conductor 43 includes a coil 43A. The coil 43A extends in the vertical direction Z. One end of the coil 43A is connected to the first electrode 41. The other end of the coil 43A is connected to a wire 43B.

[0051] In detail, in the first electromagnetic wave generating unit 36A, the first conductor 43 is connected to the first electrode 41 at a position relative to the center in the first cross direction Y1. That is, the coil 43A of the first electromagnetic wave generating unit 36A is positioned on the side of the first cross direction Y1 when viewed from the main viewpoint.

[0052] In the second electromagnetic wave generating unit 36B, the first conductor 43 is connected to the first electrode 41 at a position relative to the center in the second cross direction Y2. That is, the coil 43A of the second electromagnetic wave generating unit 36B is positioned on the side of the second cross direction Y2 when viewed from the main viewpoint.

[0053] Thus, the coil 43A of the first electromagnetic wave generating unit 36A and the coil 43A of the second electromagnetic wave generating unit 36B are positioned in a location that does not overlap during main view. This reduces the influence of strong magnetic fields in the coil 43A of the first electromagnetic wave generating unit 36A and the coil 43A of the second electromagnetic wave generating unit 36B, which are adjacent in the width direction X. Figure 2 In order to make the invention easier to understand, the first conductor 43 in the first electromagnetic wave generating unit 36A and the second electromagnetic wave generating unit 36B is shown, and the first conductor 43 in the electromagnetic wave generating unit 36 ​​other than that is omitted.

[0054] like Figure 3 as well as Figure 4 As shown, the second conductor 44 is configured to electrically connect the transmission line 32 to the second electrode 42. The second conductor 44 may also have a support post 44A. The second conductor 44 may also have multiple supports post 44A. The supports post 44A are electrically connected to the second electrode 42. The supports post 44A extend upward Z1 from the second electrode 42. The supports post 44A are made of metal.

[0055] In this embodiment, the second conductor 44 may also have two supports 44A in the width direction X. One second conductor 44 extends upward Z1 from the second electrode 42 located on the first electromagnetic wave generating section 36A on the first width direction X1 side. Another second conductor 44 extends upward Z1 from the second electrode 42 located on the second width direction X2 side of the fourth electromagnetic wave generating section 36D located on the second width direction X2 side.

[0056] The second conductor 44 may also have a top plate 44B. The top plate 44B is electrically connected to the support column 44A. The top plate 44B is located at the upper end of the support column 44A. The top plate 44B connects multiple supports 44A. The top plate 44B may also be integral with the support column 44A. The top plate 44B is made of metal. Figure 2 In order to make the invention easier to understand, the top plate 44B was omitted.

[0057] like Figure 2 As shown, the opposing portion 45 is located Z2 below the first electrode 41 and the second electrode 42. That is, the opposing portion 45 is located between the first electrode 41 and the second electrode 42 and the dielectric 90. The opposing portion 45 may also be in the shape of a flat plate.

[0058] The opposing portion 45 is constructed using a material that allows electromagnetic waves generated by the electromagnetic wave generating portion 36 to pass through. The opposing portion 45 is arranged opposite to the surface 90A of the dielectric 90. The opposing portion 45 may or may not contact the dielectric 90. The opposing portion 45 protects the first electrode 41 and the second electrode 42. The opposing portion 45 is constructed from an insulating component. The opposing portion 45 may also be a glass plate. The opposing portion 45 may also be a ceramic with high transmittance. The opposing portion 45 may also be made of a resin with a low dielectric loss tangent. The opposing portion 45 may also be made of polypropylene. The opposing portion 45 may also be made of polyethylene.

[0059] By configuring the electromagnetic wave generating unit 36 ​​in this way, when a high-frequency voltage is applied to the first electrode 41 and the second electrode 42, electromagnetic waves are generated according to the application of the high-frequency voltage to heat the medium 90.

[0060] Such an electromagnetic wave generating unit 36 ​​can transfer a large amount of heat energy to the medium 90 by generating electromagnetic waves. The electromagnetic wave generating unit 36 ​​may also use electromagnetic waves instead of heat conduction, thus eliminating the need for heating wires or other components. As a result, the electromagnetic wave generating unit 36 ​​can be miniaturized.

[0061] Furthermore, the minimum separation distance between the first electrode 41 and the second electrode 42 is less than 1 / 10 of the wavelength of the electromagnetic wave output from the electromagnetic wave generating unit 36. This allows the electromagnetic wave generated when a high-frequency voltage is applied to attenuate near the first electrode 41 and the second electrode 42. Consequently, the intensity of the electromagnetic wave reaching a distance from the first electrode 41 and the second electrode 42 can be reduced. In other words, the electromagnetic wave generated from the electromagnetic wave generating unit 36 ​​is very strong near the first electrode 41 and the second electrode 42, but becomes very weak at a distance.

[0062] By appropriately controlling the frequency band of the generated electromagnetic waves, the electromagnetic wave generating unit 36 ​​can concentrate the alternating electric field in the vicinity of the first electrode 41 and the second electrode 42. In other words, it can suppress the influence on the surrounding environment caused by the generation of electromagnetic waves beyond the vicinity of the first electrode 41 and the second electrode 42. The vicinity of the first electrode 41 and the second electrode 42 can be, for example, a range of 3 mm to 3 cm.

[0063] Although in this embodiment, such as Figure 5 As shown, the drying unit 30 is configured such that the first electrode 41 extends along the intersecting direction Y in order to facilitate understanding of the invention, but it is not limited thereto. Figure 6 As shown, the first electrode 41 can also be arranged such that it is tilted at a predetermined angle from the intersecting direction Y. This promotes the homogenization of the drying of the medium 90. In this case, the direction in which the plurality of electromagnetic wave generating units 36 are arranged is an example of the second direction, and the direction intersecting the vertical direction Z and the second direction is an example of the third direction.

[0064] Metal plates 51 and 52 like Figures 2 to 4 As shown, the drying unit 30 includes a connecting portion 50, a first metal plate 51, and a second metal plate 52. That is, the drying apparatus 12 includes a connecting portion 50, a first metal plate 51, and a second metal plate 52. The drying unit 30 may also include multiple connecting portions 50, multiple first metal plates 51, and multiple second metal plates 52. Figure 2 In order to make the invention easier to understand, the second metal plate 52 is represented by a double-dotted line.

[0065] A first metal plate 51 is disposed at a position in the vertical direction Z, separated from the plurality of electromagnetic wave generating units 36 by a medium 90. The first metal plate 51 may also be flat. The first metal plate 51 is configured to extend along the vertical direction Z. The first metal plate 51 is disposed between adjacent locations of the plurality of electromagnetic wave generating units 36. Specifically, the first metal plate 51 is disposed in the width direction X between the first electromagnetic wave generating unit 36A and the second electromagnetic wave generating unit 36B.

[0066] The connecting portion 50 is conductive. The connecting portion 50 is in the shape of a flat plate, but it can also be in the shape of a line. The connecting portion 50 is configured to electrically connect a plurality of first metal plates 51 to the second electrode 42.

[0067] The connecting portion 50 is electrically connected to a plurality of first metal plates 51 at both ends in the first intersecting direction Y1 and the second intersecting direction Y2. The connecting portion 50 is also connected to the second electrode 42 at both ends in the first intersecting direction Y1 and the second intersecting direction Y2. The connecting portion 50 is connected to the second electrode 42 on the first width direction X1 side of the first electromagnetic wave generating portion 36A and the second electrode 42 on the second width direction X2 side of the fourth electromagnetic wave generating portion 36D.

[0068] Thus, the first metal plate 51 is electrically connected to the second electrode 42 via the connecting portion 50. That is, the first metal plate 51 is electrically connected to the second electrode 42 of the first electromagnetic wave generating unit 36A and the second electrode 42 of the second electromagnetic wave generating unit 36B via the connecting portion 50. The first metal plate 51 and the second electrode 42 are electrically connected at both ends via the connecting portion 50 when viewed from the main viewpoint.

[0069] The second electrode 42 has a predetermined region. This predetermined region is close to the region where the first electrode 41, to which the coil 43A is connected, is located. When electromagnetic waves are generated from the electromagnetic wave generating unit 36, a large current flows through the predetermined region of the second electrode 42. Specifically, a large current flows from the predetermined region of the second electrode 42 towards both the end in the first intersecting direction Y1 and the end in the second intersecting direction Y2. Thus, a strong electric field is generated by the large current flowing through the predetermined region of the second electrode 42.

[0070] In this case, the first metal plate 51 is configured to attenuate the strong electric fields generated in each of the plurality of adjacent electromagnetic wave generating units 36 in the width direction X. Specifically, the first metal plate 51 can reduce the influence of strong electric fields in the first electromagnetic wave generating units 36A and the second electromagnetic wave generating units 36B that are adjacent in the width direction X.

[0071] In particular, when the first metal plate 51 and the second electrode 42 are electrically connected at both ends during main view observation, current flows from both ends of the second electrode 42 toward the center. That is, current flows from both ends of the second electrode 42 toward a predetermined area. In this way, by reducing the current value in the predetermined area of ​​the second electrode 42, the influence of the strong electric field in the first electromagnetic wave generating unit 36A and the second electromagnetic wave generating unit 36B can be reduced.

[0072] The first metal plate 51 is configured to attenuate the strong magnetic field from the respective coils 43A of the plurality of electromagnetic wave generating units 36. Specifically, the first metal plate 51 can reduce the influence of the strong magnetic field in the coils 43A of the first electromagnetic wave generating unit 36A and the coils 43A of the second electromagnetic wave generating unit 36B that are adjacent in the width direction X.

[0073] The second metal plate 52 is positioned relative to the first metal plate 51 and separated by a medium 90 in the vertical direction Z. The second metal plate 52 may also be flat. The second metal plate 52 is configured to extend along the vertical direction Z. The second metal plate 52 is disposed between adjacent portions of the plurality of electromagnetic wave generating portions 36. Specifically, the second metal plate 52 is disposed between the first electromagnetic wave generating portion 36A and the second electromagnetic wave generating portion 36B in the width direction X.

[0074] The second metal plate 52 can also be connected to the top plate 44B. The second metal plate 52 is connected to the second electrode 42 via the second conductor 44. That is, the second metal plate 52 is connected to the second electrode 42 via the second conductor 44. Thus, the second metal plate 52 is electrically connected to the second electrode 42 of the first electromagnetic wave generating unit 36A and the second electrode 42 of the second electromagnetic wave generating unit 36B.

[0075] The second metal plate 52 is separated from the second electrodes 42 of the plurality of electromagnetic wave generating units 36 in the vertical direction Z. Specifically, the second metal plate 52 is separated from the second electrodes 42 of the first electromagnetic wave generating unit 36A and the second electrodes 42 of the second electromagnetic wave generating unit 36B in the vertical direction Z.

[0076] Therefore, the second metal plate 52 is positioned in a location electrically connected to the second electrode 42 without affecting the first electrode 41. In other words, the second metal plate 52 is electrically connected to the second electrode 42 so that its potential is the same as the second electrode 42, and is also positioned so as not to function as the second electrode 42 by being separated from the first electrode 41. Therefore, the reduction in energy efficiency of the electromagnetic waves generated from the multiple electromagnetic wave generating units 36 can be suppressed. When the second electrode 42 is grounded, the second metal plate 52 is also grounded in the same way as the second electrode 42.

[0077] The second metal plate 52 is configured to cover the coils 43A of the plurality of electromagnetic wave generating units 36 when viewed from the main viewpoint. In other words, the second metal plate 52 is configured to attenuate the strong magnetic fields from the respective coils 43A of the plurality of adjacent electromagnetic wave generating units 36 in the width direction X. Specifically, the second metal plate 52 can reduce the influence of strong magnetic fields on the coils 43A of the first electromagnetic wave generating unit 36A and the coils 43A of the second electromagnetic wave generating unit 36B that are adjacent in the width direction X.

[0078] The function and effects of the first implementation method The function and effects of the first embodiment will be explained.

[0079] (1) The first electromagnetic wave generating unit 36A and the second electromagnetic wave generating unit 36B are arranged in the width direction X. The first metal plate 51 is positioned in the vertical direction Z, separated from the plurality of electromagnetic wave generating units 36 by a medium 90, and in the width direction X, between the first electromagnetic wave generating unit 36A and the second electromagnetic wave generating unit 36B. The first metal plate 51 is configured to extend along the vertical direction Z. Thus, the first metal plate 51 is electrically connected to the second electrode 42 of the first electromagnetic wave generating unit 36A and the second electrode 42 of the second electromagnetic wave generating unit 36B. According to this structure, even when the first electromagnetic wave generating unit 36A and the second electromagnetic wave generating unit 36B are arranged in close proximity, the interference of the alternating electric field between the first electromagnetic wave generating unit 36A and the second electromagnetic wave generating unit 36B can be suppressed by the first metal plate 51. Therefore, it is possible to suppress the enlargement of the drying device 12.

[0080] (2) The second metal plate 52 is positioned relative to the first metal plate 51 in the vertical direction Z, separated by a medium 90, and located between the first electromagnetic wave generating section 36A and the second electromagnetic wave generating section 36B in the width direction X. The second metal plate 52 is configured to extend along the vertical direction Z. The second metal plate 52 is electrically connected to the second electrode 42 of the first electromagnetic wave generating section 36A and the second electrode 42 of the second electromagnetic wave generating section 36B. According to this structure, even when the first electromagnetic wave generating section 36A and the second electromagnetic wave generating section 36B are positioned close to each other, the interference of the alternating electric fields of the first electromagnetic wave generating section 36A and the second electromagnetic wave generating section 36B can be suppressed by the second metal plate 52. Therefore, it is possible to suppress the enlargement of the drying device 12.

[0081] (3) The second metal plate 52 is separated from the second electrode 42 of the first electromagnetic wave generating unit 36A and the second electrode 42 of the second electromagnetic wave generating unit 36B in the vertical direction Z. According to this structure, the second metal plate 52 is electrically connected to the second electrode 42, and also separated from the second electrode 42. Therefore, by configuring the second metal plate 52 in a way that reduces the impact on the first electrode 41, it is possible to suppress the reduction in energy efficiency of the electromagnetic waves generated from the multiple electromagnetic wave generating units 36.

[0082] (4) The coil 43A of the first electromagnetic wave generating unit 36A and the coil 43A of the second electromagnetic wave generating unit 36B are positioned so as not to overlap during main view. This configuration allows the coil 43A of the first electromagnetic wave generating unit 36A to be kept far apart from the coil 43A of the second electromagnetic wave generating unit 36B. Therefore, even when the first electromagnetic wave generating unit 36A and the second electromagnetic wave generating unit 36B are positioned close together, mutual interference between the coils 43A of the first electromagnetic wave generating unit 36A and the coils 43A of the second electromagnetic wave generating unit 36B can be suppressed. Thus, the enlargement of the drying apparatus 12 can be prevented.

[0083] (5) During main view observation, the first metal plate 51, the second electrode 42 of the first electromagnetic wave generating unit 36A, and the second electrode 42 of the second electromagnetic wave generating unit 36B are electrically connected at both ends. According to this structure, a current that is opposite in phase to the current flowing in the second electrode 42 can be generated in the region close to the coil 43A. Therefore, the current flowing in the second electrode 42 in the region close to the coil 43A can be reduced. Thus, even when the first electromagnetic wave generating unit 36A and the second electromagnetic wave generating unit 36B are positioned close to each other, interference between the alternating current fields of the first electromagnetic wave generating unit 36A and the second electromagnetic wave generating unit 36B can be suppressed by the first metal plate 51. Therefore, the enlargement of the drying device 12 can be suppressed.

[0084] (6) The second electrode 42 of the first electromagnetic wave generating unit 36A and the second electromagnetic wave generating unit 36B are shared in the width direction X at the position where the first electromagnetic wave generating unit 36A and the second electromagnetic wave generating unit 36B are arranged. According to this structure, the first electromagnetic wave generating unit 36A and the second electromagnetic wave generating unit 36B can be arranged in a closer position. Even in this case, interference between the alternating current fields of the first electromagnetic wave generating unit 36A and the second electromagnetic wave generating unit 36B can be suppressed by the first metal plate 51. Therefore, the large-scale design of the drying device 12 can be suppressed.

[0085] (7) Even if the multiple high-frequency voltage generating units 31 can supply high-frequency voltage independently relative to the multiple electromagnetic wave generating units 36, the interference of the alternating electric fields of the first electromagnetic wave generating unit 36A and the second electromagnetic wave generating unit 36B can be suppressed by the first metal plate 51. Therefore, the large-scale development of the drying device 12 can be suppressed.

[0086] Change Example This embodiment can be modified and implemented in the following ways. This embodiment and the following modifications can be combined and implemented with each other within the scope of technical inconsistency.

[0087] The coil 43A of the first electromagnetic wave generating unit 36A and the coil 43A of the second electromagnetic wave generating unit 36B only need to be arranged in a position that does not overlap when viewed from the main viewpoint, or they may not be arranged on the side of the first intersection direction Y1 and the side of the second intersection direction Y2 when viewed from the main viewpoint. The coil 43A of the first electromagnetic wave generating unit 36A and the coil 43A of the second electromagnetic wave generating unit 36B may also be arranged in a position that partially or completely overlaps when viewed from the main viewpoint.

[0088] The first metal plate 51 and the second electrode 42 may also be electrically connected at one of their ends when viewed from the main view. In this case, it is preferable that the first metal plate 51 and the second electrode 42 are electrically connected at the end closest to the coil 43A when viewed from the main view. The first metal plate 51 and the second electrode 42 need only be electrically connected at at least one of the first width direction X1 side and the second width direction X2 side.

[0089] The second metal plate 52 may also be configured to overlap a portion of the coil 43A when viewed from the main view. The drying unit 30 may also include either the first metal plate 51 or the second metal plate 52, but not either of the other.

[0090] The second metal plate 52 may also be electrically connected to the support column 44A instead of the top plate 44B. That is, the second metal plate 52 may also be electrically connected to the second conductor 44. The second metal plate 52 may also be electrically connected to the second electrode 42 without passing through the second conductor 44.

[0091] Although the multiple high-frequency voltage generating units 31 are configured to independently supply high-frequency voltage to the multiple electromagnetic wave generating units 36, they may also supply high-frequency voltage to the multiple electromagnetic wave generating units 36 without independence. That is, they may be configured to supply high-frequency voltage from the multiple high-frequency voltage generating units 31 to one electromagnetic wave generating unit 36. They may also be configured to supply high-frequency voltage from one high-frequency voltage generating unit 31 to the multiple electromagnetic wave generating units 36. The drying device 12 may also have a structure that does not have multiple high-frequency voltage generating units 31, but has only a single high-frequency voltage generating unit 31.

[0092] Although the multiple electromagnetic wave generating units 36 are integrally constructed by sharing the second electrode 42, the second electrode 42 may not be shared. The multiple electromagnetic wave generating units 36 may also be constructed separately.

[0093] The multiple electromagnetic wave generating units 36 can also be configured such that the width direction X is the length direction. That is, the cross direction Y can also be an example of a second direction. The width direction X can also be an example of a third direction. Thus, the drying unit 30 can also be configured such that the first electrode 41 extends along the width direction X.

[0094] The electromagnetic wave generating unit 36 ​​can also be provided on the back side 90B of the medium 90. Alternatively, the electromagnetic wave generating unit 36 ​​can be provided on both the surface side 90A and the back side 90B of the medium 90. The electromagnetic wave generating unit 36 ​​can also be configured to scan in the width direction X.

[0095] The electromagnetic wave generating unit 36 ​​may also be separately provided from the opposing unit 45. That is, the electromagnetic wave generating unit 36 ​​may not have the opposing unit 45. In this case, it is preferable that the opposing unit 45 is provided between the first electrode 41 and the second electrode and the dielectric 90.

[0096] • The first electrode 41 is not limited to a flat plate shape; for example, it may also be a generally flat plate shape. A generally flat plate shape may be a shape with a large aspect ratio that is curved along the vertical direction Z, i.e., the thickness direction, or a rectangular shape, or may include a linear shape.

[0097] The second electrode 42 is not limited to a flat plate shape; for example, it can also be a generally flat plate shape. A generally flat plate shape is, for example, a shape that is curved along the vertical direction Z, i.e., the thickness direction, or a rectangular shape with a very large aspect ratio, and may also include a linear shape.

[0098] • At least one of the first electrode surface 41A and the second electrode surface 42A is not limited to a planar shape, but may also be a generally planar shape. A generally planar shape may be a shape with a large aspect ratio that is curved along the vertical direction Z, i.e., the thickness direction, or a rectangular shape, and may also include a linear shape.

[0099] The electromagnetic wave generating unit 36 ​​may not be provided on the drying device 12, but rather on the recording device 11. That is, the recording device 11 may also include the electromagnetic wave generating unit 36. In this case, the electromagnetic wave generating unit 36 ​​only needs to be provided downstream of the recording unit 20 in the transport direction D. Thus, the electromagnetic wave generating unit 36 ​​may not be used in the drying device 12, but rather in the recording device 11.

[0100] • As the recording device 11, a side-shift printer can also be used. A side-shift printer is a printer in which the carriage 25 can move in both the main scanning direction and the sub-scanning direction.

[0101] • The medium 90 is not limited to a roll. The medium 90 can also be paper, resin film or sheet, resin and metal composite film, laminated film, fabric, non-woven fabric, metal foil, metal film, ceramic sheet, and clothing, etc.

[0102] • The liquid can be arbitrarily selected as long as it is a liquid that can be recorded on the medium 90 by adhering to the medium 90. For example, the ink may also include substances such as water-based inks, oil-based inks, gel inks, hot melt inks, etc., which are composed of functional material particles such as pigments or metal particles dissolved, dispersed, or mixed in a solvent.

[0103] • The expression "at least one" as used in this specification means one or more of the desired options. As an example, "at least one" as used in this specification means that if there are two options, it refers to only one option or both of the two options. As another example, "at least one" as used in this specification means that if there are three or more options, it refers to only one option or any combination of two or more options.

[0104] Postscript The following describes the technical concept and its effects as understood from the above-described embodiments and modifications. These technical concepts and their effects can be combined with each other without technical contradiction.

[0105] [1] A drying apparatus comprising: a plurality of electromagnetic wave generating units that generate electromagnetic waves by applying a high-frequency voltage, thereby drying a medium from which liquid has been sprayed; a first metal plate, wherein each of the plurality of electromagnetic wave generating units has: a first electrode; a second electrode configured to surround the first electrode when viewed from a plane in a first direction toward the medium; a first conductor having a coil and electrically connecting a transmission line capable of transmitting a high-frequency voltage to the first electrode; and a second conductor electrically connecting the transmission line to the second electrode. The plurality of electromagnetic wave generating units have a first electromagnetic wave generating unit and a second electromagnetic wave generating unit, the first electromagnetic wave generating unit and the second electromagnetic wave generating unit being configured to be arranged in a second direction intersecting the first direction. The first metal plate is configured to be positioned in the first direction relative to the plurality of electromagnetic wave generating units, separated by the medium, and in the second direction between the first electromagnetic wave generating unit and the second electromagnetic wave generating unit, and is configured to extend along the first direction, and is electrically connected to the second electrode of the first electromagnetic wave generating unit and the second electrode of the second electromagnetic wave generating unit.

[0106] According to this structure, even when the first electromagnetic wave generating unit and the second electromagnetic wave generating unit are positioned close to each other, the interference between the alternating electric fields of the first electromagnetic wave generating unit and the second electromagnetic wave generating unit can be suppressed by the first metal plate. Therefore, it is possible to suppress the scaling up of the drying device.

[0107] [2] In the above-described drying apparatus, it may also be provided that a second metal plate is provided, the second metal plate is disposed at a position in the first direction that is separated from the first metal plate by a medium and at a position between the first electromagnetic wave generating part and the second electromagnetic wave generating part in the second direction, the second metal plate is configured to extend along the first direction and is electrically connected to the second electrode of the first electromagnetic wave generating part and the second electrode of the second electromagnetic wave generating part.

[0108] According to this structure, even when the first electromagnetic wave generating unit and the second electromagnetic wave generating unit are positioned close to each other, the interference between the alternating electric fields of the first electromagnetic wave generating unit and the second electromagnetic wave generating unit can be suppressed by the second metal plate. Therefore, it is possible to suppress the scaling up of the drying device.

[0109] [3] In the above-mentioned drying device, the second metal plate may also be configured to be separated from the second electrode of the first electromagnetic wave generating part and the second electrode of the second electromagnetic wave generating part in the first direction.

[0110] According to this structure, the second metal plate is electrically connected to the second electrode, and the second metal plate is also separated from the second electrode. Therefore, by configuring the second metal plate in a way that reduces the impact on the first electrode, it is possible to suppress the reduction in energy efficiency of electromagnetic waves generated from multiple electromagnetic wave generating units.

[0111] [4] In the above-described drying apparatus, the coil of the first electromagnetic wave generating unit and the coil of the second electromagnetic wave generating unit may be arranged in a non-overlapping position when viewed from a plane in the second direction.

[0112] According to this structure, the coil of the first electromagnetic wave generating unit and the coil of the second electromagnetic wave generating unit can be kept apart. Therefore, even when the first and second electromagnetic wave generating units are positioned close to each other, mutual interference between the coils of the first and second electromagnetic wave generating units can be suppressed. Thus, it is possible to prevent the drying device from becoming too large.

[0113] [5] In the above-described drying apparatus, the coil of the first electromagnetic wave generating unit may be positioned on one side of a third direction intersecting the first and second directions when viewed from a plane in the second direction, and the coil of the second electromagnetic wave generating unit may be positioned on the other side of that third direction when viewed from a plane in the second direction. With this configuration, the same effect as in [4] can be achieved.

[0114] [6] In the above-described drying apparatus, the first metal plate, the second electrode of the first electromagnetic wave generating unit, and the second electrode of the second electromagnetic wave generating unit may be electrically connected at both ends when viewed from the second direction in a plane.

[0115] According to this structure, a current that is in the opposite phase to the current flowing in the second electrode can be generated in the region close to the coil. Therefore, the current flowing in the second electrode in the region close to the coil can be reduced. Thus, even when the first electromagnetic wave generating unit and the second electromagnetic wave generating unit are positioned close to each other, interference between the alternating electric fields of the first and second electromagnetic wave generating units can be suppressed by the first metal plate. Therefore, it is possible to prevent the drying device from becoming too large.

[0116] [7] In the above-described drying apparatus, the second electrode of the first electromagnetic wave generating part and the second electrode of the second electromagnetic wave generating part may be shared in the second direction at a position where the first electromagnetic wave generating part and the second electromagnetic wave generating part are arranged.

[0117] According to this structure, the first electromagnetic wave generating unit and the second electromagnetic wave generating unit can be positioned closer together. Even in this case, interference between the alternating electric fields of the first and second electromagnetic wave generating units can be suppressed by the first metal plate. Therefore, it is possible to prevent the drying device from becoming too large.

[0118] [8] In the above-mentioned drying apparatus, it may also be configured to have a plurality of high-frequency voltage generating units, which generate the high-frequency voltage and supply the high-frequency voltage independently to the plurality of electromagnetic wave generating units.

[0119] According to this structure, even if multiple high-frequency voltage generating units can independently supply high-frequency voltage to multiple electromagnetic wave generating units, the interference between the alternating electric fields of the first electromagnetic wave generating unit and the second electromagnetic wave generating unit can be suppressed by the first metal plate. Therefore, it is possible to suppress the scaling up of the drying device.

[0120] [9] A recording apparatus comprising: a recording unit that records by spraying liquid onto a medium; a plurality of electromagnetic wave generating units that generate electromagnetic waves by applying a high-frequency voltage, thereby drying the medium onto which liquid has been sprayed through the recording unit; a first metal plate, wherein each of the plurality of electromagnetic wave generating units has: a first electrode; a second electrode configured to surround the first electrode when viewed from a plane in a first direction toward the medium; a first conductor having a coil and electrically connecting a transmission line capable of transmitting a high-frequency voltage to the first electrode; and a second conductor electrically connecting the transmission line to the second electrode. The plurality of electromagnetic wave generating units have a first electromagnetic wave generating unit and a second electromagnetic wave generating unit. The first electromagnetic wave generating unit and the second electromagnetic wave generating unit are arranged in a second direction intersecting the first direction. The first metal plate is configured to be positioned in the first direction relative to the plurality of electromagnetic wave generating units, separated by a medium, and in the second direction between the first electromagnetic wave generating unit and the second electromagnetic wave generating unit. It is configured to extend along the first direction and is electrically connected to the second electrode of the first electromagnetic wave generating unit and the second electrode of the second electromagnetic wave generating unit. According to this structure, the same effect as [1] can be achieved.

[0121] Symbol Explanation 10…Recording system; 11…Recording device; 12…Drying device; 13…Feeding section; 13A…Feeding roller; 14…Take-up section; 14A…Take-up roller; 20…Recording section; 21…Recording support section; 22…Recording conveyor section; 23…Head; 24…Nozzle surface; 25…Carriage; 26…Carriage support section; 30…Drying unit; 31…High-frequency voltage generating section; 32…Transmission line; 33…Drying conveyor section; 35…Control section; 36…Electromagnetic wave generating section; 36A…First electromagnetic wave generating section; 36B…Second electromagnetic wave generating section; 36C…Third electromagnetic wave generating section; 36D…Fourth electromagnetic wave generating section; 41…First electrode; 41A…First electrode surface; 41B… …Central part; 41C…Both ends; 42…Second electrode; 42A…Second electrode surface; 42B…Opening; 43…First conductor; 43A…Coil; 43B…Wire; 44…Second conductor; 44A…Support; 44B…Top plate; 45…Opposing part; 50…Connecting part; 51…First metal plate; 52…Second metal plate; 90…Dielectric; 90A…Surface; 90B…Back side; 91…First reel; 92…Second reel; D…Conveying direction; X…Width direction; X1…First width direction; X2…Second width direction; Y…Crossing direction; Y1…First crossing direction; Y2…Second crossing direction; Z…Vertical direction; Z1…Above; Z2…Below.

Claims

1. A drying apparatus, characterized in that, have: Multiple electromagnetic wave generating units, which generate electromagnetic waves by applying a high-frequency voltage to dry the medium from which the liquid has been ejected. First metal plate, Each of the plurality of electromagnetic wave generating units has: First electrode; The second electrode is configured to surround the first electrode when viewed from a plane in a first direction toward the medium. A first conductor having a coil and electrically connecting a transmission line capable of transmitting high-frequency voltage to the first electrode; A second conductor electrically connects the transmission line to the second electrode. The plurality of electromagnetic wave generating units include a first electromagnetic wave generating unit and a second electromagnetic wave generating unit. The first electromagnetic wave generating unit and the second electromagnetic wave generating unit are configured to be arranged in a second direction intersecting the first direction. The first metal plate is set to be, It is positioned in the first direction relative to the plurality of electromagnetic wave generating units, separated by a medium, and in the second direction between the first electromagnetic wave generating unit and the second electromagnetic wave generating unit. It is configured to extend along the first direction, and It is electrically connected to the second electrode of the first electromagnetic wave generating unit and the second electrode of the second electromagnetic wave generating unit.

2. The drying apparatus as described in claim 1, characterized in that, The device includes a second metal plate, which is positioned relative to the first metal plate in the first direction and separated by a medium, and is located between the first electromagnetic wave generating part and the second electromagnetic wave generating part in the second direction. The second metal plate is set to be, It is configured to extend along the first direction, and It is electrically connected to the second electrode of the first electromagnetic wave generating unit and the second electrode of the second electromagnetic wave generating unit.

3. The drying apparatus as described in claim 2, characterized in that, The second metal plate is separated from the second electrode of the first electromagnetic wave generating part and the second electrode of the second electromagnetic wave generating part in the first direction.

4. The drying apparatus according to any one of claims 1 to 3, characterized in that, The coils of the first electromagnetic wave generating unit and the coils of the second electromagnetic wave generating unit are arranged in non-overlapping positions when viewed from a plane in the second direction.

5. The drying apparatus as described in claim 4, characterized in that, When viewed from a plane in the second direction, the coil of the first electromagnetic wave generating unit is positioned on a third upward side that intersects both the first and second directions. When viewed from a plane in the second direction, the coil of the second electromagnetic wave generating unit is positioned on the other side in the third direction.

6. The drying apparatus according to any one of claims 1 to 3, characterized in that, When viewed from the second direction, the first metal plate, the second electrode of the first electromagnetic wave generating part, and the second electrode of the second electromagnetic wave generating part are electrically connected at both ends.

7. The drying apparatus according to any one of claims 1 to 3, characterized in that, The second electrode of the first electromagnetic wave generating part and the second electrode of the second electromagnetic wave generating part are shared in the second direction at the position where the first electromagnetic wave generating part and the second electromagnetic wave generating part are arranged.

8. The drying apparatus according to any one of claims 1 to 3, characterized in that, It has multiple high-frequency voltage generating units, which generate the high-frequency voltage. The plurality of high-frequency voltage generating units independently supply the high-frequency voltage to the plurality of electromagnetic wave generating units.

9. A recording device, characterized in that, have: The recording unit records data by spraying liquid onto a medium. Multiple electromagnetic wave generating units generate electromagnetic waves by applying a high-frequency voltage, thereby drying the medium through which the liquid ejected from the recording unit is dried. First metal plate, Each of the plurality of electromagnetic wave generating units has: First electrode; The second electrode is configured to surround the first electrode when viewed from a plane in a first direction toward the medium. A first conductor having a coil and electrically connecting a transmission line capable of transmitting high-frequency voltage to the first electrode; A second conductor electrically connects the transmission line to the second electrode. The plurality of electromagnetic wave generating units include a first electromagnetic wave generating unit and a second electromagnetic wave generating unit. The first electromagnetic wave generating unit and the second electromagnetic wave generating unit are configured to be arranged in a second direction intersecting the first direction. The first metal plate is set to be, It is positioned in the first direction relative to the plurality of electromagnetic wave generating units, separated by a medium, and in the second direction between the first electromagnetic wave generating unit and the second electromagnetic wave generating unit. It is configured to extend along the first direction, and It is electrically connected to the second electrode of the first electromagnetic wave generating unit and the second electrode of the second electromagnetic wave generating unit.

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