Discharge devices and electrical equipment

Abstract

To realize a small discharge device that can reduce noise.SOLUTION: An ion generation device (100) includes a high-voltage transformer (2), discharge electrodes (5, 6) connected to a secondary terminal (2a) of the high-voltage transformer (2), an induction electrode (7) that generates ions between the discharge electrodes (5, 6) and is connected to the secondary terminal (2b) of the high-voltage transformer (2). A first conductive path including the terminal (2a) and ranging from the terminal (2a) to the discharge electrodes (5, 6) and a second conductive path including the terminal (2b) and the induction electrode (7) are partially close to each other, and face each other.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a discharge device that suppresses noise accompanying high-voltage discharge. [Background technology]

[0002] The discharge device generates discharge products by generating a high-voltage discharge between a discharge electrode and an induction electrode. The discharge device is provided with a high-voltage generating unit for generating a pulsed high voltage used for the high-voltage discharge. The high-voltage generating unit generates electromagnetic noise such as radiation noise and induction noise.

[0003] Such electromagnetic noise propagates from the drive circuit of the discharge device through the power line to the device in which the discharge device is installed. Furthermore, if the electromagnetic noise leaks out through the power cord of the device, it may enter other devices that use the same power system as the device in question. As a result, devices affected by the electromagnetic noise may malfunction.

[0004] To solve this problem, devices are generally equipped with components such as line filters for noise removal. Other solutions include those disclosed in Patent Documents 1 and 2.

[0005] Patent Document 1 discloses an ozone generator including a pulse generator capable of generating a pulse voltage, a plurality of electrodes to which the pulse voltage is applied, and a discharge reactor that generates ozone by discharge generated between the plurality of electrodes. The ozone generator includes a first shield that covers a magnetic pulse compression circuit in the pulse generator and a second shield that covers the discharge reactor and is independent of the first shield in order to block electromagnetic noise.

[0006] Patent Document 2 discloses an ion generating device including a power control unit that controls the entire device, and a high-voltage generating circuit that generates a high voltage to be applied to a discharge unit based on a command from the power control unit. In this ion generating device, the power control unit is provided on a first board, while the high-voltage generating circuit is provided on a second board that is located at a different position from the first board, thereby making the power control unit less susceptible to the effects of magnetic noise generated by the high-voltage generating unit. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2011-37650 A [Patent Document 2] JP 2013-4416 A Summary of the Invention [Problem to be solved by the invention]

[0008] The device disclosed in Patent Document 1 needs to include two shields that are independent of each other, which makes it difficult to reduce the size of the device.

[0009] In addition, according to the device disclosed in Patent Document 2, among the noises generated by the device, the conductive noise can be easily reduced, but in order to reduce the radiated noise and the inductive noise, the first substrate and the second substrate need to be separated by a large distance, which makes it difficult to miniaturize the device disclosed in Patent Document 2.

[0010] An object of one aspect of the present invention is to provide a small-sized discharge device capable of reducing noise. [Means for solving the problem]

[0011] In order to solve the above problems, a discharge device according to one aspect of the present invention includes a transformer, a first conductive path connected to a first terminal on a secondary side of the transformer, a second conductive path connected to a second terminal on the secondary side of the transformer, and a discharge electrode electrically connected to the first terminal via the first conductive path, wherein a first distance, which is the shortest distance between the first conductive path and the second conductive path, is: 0 The range is greater than mm and less than or equal to 10 mm. Effect of the Invention

[0012] According to one aspect of the present invention, a small-sized discharge device capable of reducing noise can be realized. [Brief description of the drawings]

[0013] [Figure 1] 1 is a plan view showing a configuration of an ion generating device according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Diagram 3] FIG. 2 is a circuit diagram showing a circuit configuration of the ion generating device. [Figure 4] 2 is a cross-sectional view taken along line AA of FIG. 1, showing another configuration of the ion generating device. [Diagram 5] 10 is a perspective view showing a state in which a conductor in an ion generating device according to a modified example of the first embodiment is connected to a high-voltage transformer. FIG. [Figure 6] FIG. 5 is a plan view showing the configuration of an ion generating device according to a second embodiment of the present invention. [Figure 7] FIG. 11 is a plan view showing the configuration of an ion generating device according to a third embodiment of the present invention. [Figure 8] FIG. 11 is a plan view showing the configuration of an ion generating device according to a fourth embodiment of the present invention. [Figure 9] 9 is a longitudinal sectional view showing a cross-sectional structure along the longitudinal direction of the ion generating device shown in FIG. 8. [Figure 10] FIG. 10 is a cross-sectional view taken along line BB in FIG. [Figure 11] FIG. 11 is a plan view showing a schematic configuration of an air purifier according to a fifth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] [Embodiment 1] In all embodiments including this embodiment, an ion generating device that generates ions as discharge products will be described. However, the present invention is not limited to an ion generating device, and can be applied to any discharge device that generates particles (discharge products) in a high energy state, such as electrons, ozone, radicals, and active species, from gas by discharging.

[0015] The first embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

[0016] Fig. 1 is a plan view showing the configuration of an ion generating device 100 according to this embodiment. Fig. 2 is a cross-sectional view taken along line AA in Fig. 1. Fig. 3 is a circuit diagram showing the circuit configuration of ion generating device 100.

[0017] Ion generating device 100 (discharge device) is a device that generates ions by discharging electricity in the air.

[0018] As shown in Figures 1 to 3, the ion generating device 100 includes a housing 1, a high-voltage transformer 2 (transformer), a drive circuit board 3, a high-voltage circuit board 4 (board), discharge electrodes 5 and 6, induction electrodes 7, diodes 8 and 9, a drive circuit 10, lead wires 11 (wiring member), and an insulating sealing material 12.

[0019] As shown in Figures 1 and 2, the housing 1 is made of insulating resin and has a box shape. The housing 1 has a bottom 1a and an opening 1b. The bottom 1a is provided on a surface on the lower end side (the lower surface in the example of Figures 1 and 2) that includes a long side and a short side of the three sides that define the box shape of the housing 1. The opening 1b is provided on a surface on the upper end side (the upper surface in the example of Figures 1 and 2) that includes the long side and the short side.

[0020] A high-voltage transformer 2, a drive circuit board 3, and a high-voltage circuit board 4 are housed in the housing 1 in this order from the bottom 1a toward the opening 1b. The inside of the housing 1 is filled with an insulating sealant 12. As the insulating sealant 12, for example, an insulating material such as epoxy resin or urethane resin is used.

[0021] Insulating sealant 12 maintains electrical insulation between high-voltage transformer 2, drive circuit board 3, and high-voltage circuit board 4. Furthermore, because opening 1b is sealed with insulating sealant 12, it is possible to prevent dust and the like from adhering to high-voltage transformer 2, drive circuit board 3, and high-voltage circuit board 4 even without providing a lid on opening 1b.

[0022] Drive circuit board 3 is an elongated, substantially rectangular circuit board. Drive circuit 10 is arranged on drive circuit board 3. Drive circuit 10 converts a DC voltage used in an apparatus in which ion generating device 100 is mounted into an AC voltage of a predetermined frequency, and applies the converted AC voltage to a primary coil of high-voltage transformer 2, thereby driving high-voltage transformer 2. High-voltage transformer 2 is a transformer that steps up the AC voltage applied by drive circuit 10.

[0023] The high-voltage circuit board 4 is a single circuit board that is elongated and approximately rectangular. Discharge electrodes 5, 6 and an induction electrode 7 are provided on the high-voltage circuit board 4. The high-voltage circuit board 4 is a single-sided board in which the discharge electrodes 5, 6, the induction electrode 7, and conductive patterns such as wiring patterns are formed only on the front surface (upper surface) thereof.

[0024] The discharge electrode 5 is attached to one end of the high-voltage circuit board 4, while the discharge electrode 6 is attached to the other end of the high-voltage circuit board 4. The discharge electrodes 5, 6 are arranged so as to rise vertically from the surface of the high-voltage circuit board 4 and protrude from the surface of the insulating sealing material 12. A portion of the discharge electrodes 5, 6 is exposed to the outside through the opening 1b of the housing 1. The discharge electrodes 5, 6 are needle-shaped electrodes formed with a sharp tip. The discharge electrodes 5, 6 are not limited to needle-shaped electrodes, and may be electrodes with a brush-shaped tip, for example.

[0025] The induction electrode 7 is provided on the surface of the high-voltage circuit board 4. The induction electrode 7 is formed around the discharge electrode 5 and around the discharge electrode 6 except for the side where the discharge electrodes 5 and 6 face each other, and has a portion formed linearly so as to connect these portions.

[0026] The induction electrode 7 is an electrode for forming an electric field between itself and the discharge electrodes 5 and 6. The discharge electrode 5 is an electrode for generating positive ions between itself and the induction electrode 7. The discharge electrode 6 is an electrode for generating negative ions between itself and the induction electrode 7.

[0027] Diodes 8 and 9 are respectively interposed between one terminal 2a (first terminal) on the secondary side of high-voltage transformer 2 and discharge electrodes 5 and 6. Diode 8 outputs a positive half-cycle of AC voltage by half-wave rectifying the AC voltage output from high-voltage transformer 2. Diode 9 outputs a negative half-cycle of AC voltage by half-wave rectifying the AC voltage output from high-voltage transformer 2. The anode of diode 8 and the cathode of diode 9 are connected to terminal 2a. The cathode of diode 8 is connected to discharge electrode 5. The anode of diode 9 is connected to discharge electrode 6.

[0028] Moreover, the other terminal 2b (second terminal) on the secondary side of the high-voltage transformer 2 is connected to the induction electrode 7. Thus, in the ion generating device 100, the secondary side of the high-voltage transformer 2 is not grounded.

[0029] When power is supplied from drive circuit 10 to high voltage transformer 2, discharge occurs between discharge electrodes 5, 6 and induction electrode 7, and ions are generated. There are no particular limitations on the components that make up the circuit of ion generating device 100, and known components can be used.

[0030] 1 and 2, terminals 2a and 2b are provided on the top surface of high-voltage transformer 2. Terminal 2a is located at a corner on the discharge electrode 5 side of the top surface of high-voltage transformer 2, and is formed to be short. Terminal 2b is located near a corner diagonally opposite the corner where terminal 2a is located on the top surface of high-voltage transformer 2, and is formed to be long so as to penetrate high-voltage circuit board 4. In addition, a tip portion of terminal 2b is connected to induction electrode 7.

[0031] Terminals 2a and 2b need to be spaced apart to a certain extent in order to ensure the necessary number of turns of the secondary winding in high-voltage transformer 2. For this reason, it is difficult to place terminals 2a and 2b close to each other.

[0032] The diode 8 is mounted on the back surface (lower surface) of the high-voltage circuit board 4. The anode terminal and cathode terminal of the diode 8 penetrate the high-voltage circuit board 4. The terminal 2a of the high-voltage transformer 2 and the anode terminal of the diode 8 are connected via a lead wire 11 and a wiring pattern 41 formed on the surface of the high-voltage circuit board 4. The cathode terminal of the diode 8 and the discharge electrode 5 are connected via a wiring pattern 42 formed on the surface of the high-voltage circuit board 4.

[0033] 1 and 2, a diode 9 is also mounted on the back side of the high-voltage circuit board 4, and an anode terminal and a cathode terminal of the diode 9 penetrate the high-voltage circuit board 4. Terminal 2a of the high-voltage transformer 2 and the cathode terminal of the diode 9 are connected via a lead wire 11 and a wiring pattern (not shown) formed on the surface of the high-voltage circuit board 4. The anode terminal of the diode 9 and the discharge electrode 6 are connected via another wiring pattern (not shown) formed on the surface of the high-voltage circuit board 4.

[0034] One end of lead wire 11 is connected to terminal 2a, and the other end of lead wire 11 penetrates high-voltage circuit board 4 and is connected to wiring pattern 41. As shown in Fig. 1, lead wire 11 and induction electrode 7 partially overlap in the plan view of Fig. 1 and partially face each other. As shown in Fig. 2, lead wire 11 extends at a steep incline from the connection position with terminal 2a toward high-voltage circuit board 4 and is disposed so as to be approximately parallel to the back surface (lower surface) of high-voltage circuit board 4 from near the lower end of discharge electrode 6 to the penetration position of high-voltage circuit board 4. As a result, part of lead wire 11 is approximately parallel to part of induction electrode 7.

[0035] Next, the noise reduction effect achieved by the arrangement of the lead wires 11 will be described.

[0036] FIG. 4 is a cross-sectional view taken along line AA in FIG. 1, showing another configuration of ion generating device 100. In FIG.

[0037] First, a reference ion generator with no noise countermeasures will be described. Although not shown, this ion generator does not include lead wires 11, and terminal 2a, which is formed to a length that reaches high-voltage circuit board 4 like terminal 2b, is connected to diodes 8 and 9 via a wiring pattern provided on high-voltage circuit board 4. An ion generator configured in this way generates the most noise.

[0038] 1 and 2, the lead wire 11 and the induction electrode 7 are arranged in parallel in part. As a result, it was confirmed that the noise generated by the reference ion generator was reduced by about 20 dB.

[0039] Further, the ion generator 100 shown in FIG. 4 does not have a portion where the lead wire 11 and the induction electrode 7 are arranged in parallel, but the lead wire 11 faces the induction electrode 7 and is arranged inclined with respect to the high-voltage circuit board 4. In such an ion generator 100, although it does not have the noise reduction effect of the ion generator 100 shown in FIGS. 1 and 2, a noise reduction of about 13 dB was confirmed as compared with the noise generated in the above-described reference ion generator.

[0040] The longer the distance between the lead wire 11 and the induction electrode 7 facing each other, the more the noise reduction effect can be improved. Also, the distance D between the facing lead wire 11 and the induction electrode 7 is preferably a value in the range exceeding 0 mm and equal to or less than 5 mm (0 mm < D ≤ 5 mm), and a practically sufficient noise reduction effect is recognized for values in this range. When the distance D exceeds 5 mm and is equal to or less than 10 mm (5 mm < D ≤ 10 mm), a good noise reduction effect close to the upper limit value (D = 5 mm) of the range of 0 mm < D ≤ 5 mm can be obtained near 5 mm. Also, in the range of 5 mm < D ≤ 10 mm, although it is inferior to the noise reduction effect of the values in the range of 0 mm < D ≤ 5 mm near 10 mm, a noise reduction effect sufficient for practical use is recognized.

[0041] Further, if insulation is ensured, the lead wire 11 may contact the high-voltage circuit board 4. In this case, the lead wire 11 will be close to the induction electrode 7 with a gap of the thickness of the high-voltage circuit board 4 (about 0.8 mm). Even if the lead wire 11 and the induction electrode 7 are close to each other to this extent, a noise reduction effect can be obtained.

[0042] In FIG. 3, the induction electrode 7 is arranged above the high-voltage circuit board 4. However, even when the induction electrode 7 is arranged below the high-voltage circuit board 4, an equivalent noise reduction effect is recognized in the same range as the above-described range of the distance D.

[0043] Here, lead wire 11 and induction electrode 7 are adjacent to each other in the up-down direction, which is the direction in which drive circuit board 3 and high voltage circuit board 4 overlap. Furthermore, lead wire 11 and induction electrode 7 may be adjacent to each other continuously or discontinuously (discontinuously).

[0044] In this manner, in the ion generating device 100 of the present embodiment, as shown in FIG. 3, a first conductive path extending from the terminal 2a of the high-voltage transformer 2 to the discharge electrodes 5 and 6 and a second conductive path including the terminal 2b of the high-voltage transformer 2 and the induction electrode 7 are arranged close to and facing each other in part. The first conductive path here is a conductive path consisting of the terminal 2a, the lead wire 11, the wiring pattern 41, the diode 8, and the wiring pattern 42, as shown in FIGS. 1 and 2. The first conductive path is also a conductive path consisting of the terminal 2a, the lead wire 11, a wiring pattern (not shown) connecting the lead wire 11 and the diode 9, the diode 9, and a wiring pattern (not shown) connecting the diode 9 and the discharge electrode 6. The second conductive path here is the terminal 2b and the induction electrode 7. The lead wire 11, which is a part of the first conductive path, and a part of the induction electrode 7, which is a part of the second conductive path, are arranged close to and facing each other and substantially parallel to each other.

[0045] Because the secondary side of the high-voltage transformer 2 is not grounded, the voltage waveforms appearing at the terminals 2a and 2b of the high-voltage transformer 2 are of opposite phase. As a result, the electromagnetic noise generated in the first conductive path and the electromagnetic noise generated in the second conductive path are also of opposite phase. Therefore, because the first conductive path and the second conductive path are partially opposed to each other, at least a portion of the electromagnetic noise generated therein cancels out each other. Moreover, in the portion where the first conductive path and the second conductive path are parallel, the effect of canceling out the electromagnetic noise is enhanced.

[0046] This eliminates the need to use a shield to block electromagnetic noise, and thus makes it possible to realize a compact ion generating device 100 that is capable of reducing noise.

[0047] Furthermore, since the first conductive path faces the second conductive path via lead wire 11, by appropriately adjusting the arrangement and shape of lead wire 11, the first conductive path and the second conductive path can be easily made to face each other.

[0048] Here, lead wire 11 may be flexible, but the flexibility may make it difficult to maintain a shape substantially parallel to induction electrode 7. In contrast, lead wire 11 may be made of a conductive material that is deformable by an external force and is hard enough to maintain the deformed shape. This makes it easy to maintain a shape substantially parallel to induction electrode 7. Lead wire 11 may also be a shape memory alloy that is deformed into a specified shape by application of a predetermined heat.

[0049] Meanwhile, the high-voltage circuit board 4 is a single-sided board, and no wiring pattern is formed on the back surface on the side of the high-voltage transformer 2. Therefore, even if the outside of the lead wire 11 is not insulated, it will not cause a short circuit with the wiring pattern when it comes into contact with the back surface of the high-voltage circuit board 4. However, if the high-voltage circuit board 4 is a double-sided board having a wiring pattern on the back surface as well, the lead wire 11 will cause a short circuit with the wiring pattern when it comes into contact with the back surface of the high-voltage circuit board 4 unless it is insulated on the outside. Therefore, in such a case, in order to avoid a short circuit, it is preferable that the lead wire 11 is covered with an insulating covering member such as a fluororesin tube.

[0050] Furthermore, the high-voltage circuit board 4 is a single board on which the discharge electrodes 5, 6 and the induction electrode 7 are provided. This allows the number of parts to be reduced compared to when the discharge electrodes 5, 6 and the induction electrode 7 are each formed on an individual board, thereby allowing the cost of the ion generating device 100 to be reduced.

[0051] Furthermore, in this embodiment, a vertical ion generating device 100 has been described in which the high-voltage circuit board 4, the drive circuit board 3, and the high-voltage transformer 2 are arranged one above the other. The present invention is not limited to this configuration, and can be applied to an ion generating device configured, for example, in which a high-voltage transformer having a different structure from the high-voltage transformer 2 is arranged to the side of the high-voltage circuit board 4 and the drive circuit board 3. In such a configuration, the high-voltage transformer has a secondary terminal on its side, and a lead wire can be arranged to extend from the terminal to the lower or upper side of the high-voltage circuit board 4 on the side.

[0052] Next, a modification of this embodiment will be described.

[0053] FIG. 5 is a perspective view showing a state in which conductor 14 is connected to high-voltage transformer 2 in ion generating device 100 according to a modified example of the present embodiment.

[0054] 5, in ion generating device 100, conductor 14 may be used instead of lead wire 11. Conductor 14 is made of a plate-shaped conductive material and has main body 14a, descending portion 14b, rising portion 14c, and connection portions 14d and 14e.

[0055] The main body 14a is formed in a long and narrow rectangular plate shape. The conductor 14 is disposed so that the main body 14a is substantially parallel to the induction electrode 7. The conductor 14 may be formed of a thin material such as a metal foil, or may be formed of a thin plate-like metal material that is thicker than a metal foil.

[0056] The falling portion 14b is formed on one end of the main body 14a with the same width as the main body 14a so as to face downward (toward the high-voltage transformer 2). The rising portion 14c is formed on the other end of the main body 14a with the same width as the main body 14a so as to face upward (toward the high-voltage circuit board 4).

[0057] Connection portion 14d protrudes from the lower end of falling portion 14b and is formed with a narrower width than falling portion 14b. Connection portion 14d is connected to terminal 2a of high-voltage transformer 2 with solder 15. Connection portion 14e protrudes from the upper end of rising portion 14c and is formed with a narrower width than rising portion 14c. Connection portion 14e is connected to wiring pattern 41 on high-voltage circuit board 4 (not shown in FIG. 5) with solder.

[0058] By using the above-described conductor 14, it is possible to ensure a width greater than that of the lead wire 11. This makes it possible to widen the range in which the first conductive path and the second conductive path face each other.

[0059] [Embodiment 2] The second embodiment of the present invention will be described below with reference to Fig. 6. For ease of explanation, components having the same functions as those described in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0060] FIG. 6 is a plan view showing the configuration of an ion generating device 100A according to this embodiment.

[0061] In this embodiment, differences from ion generating device 100 of the above-described first embodiment will be mainly described.

[0062] 6, ion generating device 100A differs from ion generating device 100 in that, instead of wiring pattern 41 (see FIG. 1), high-voltage circuit board 4 is provided with wiring pattern 43 that is longer than wiring pattern 41. Ion generating device 100A also has lead wire 13 instead of lead wire 11 (see FIG. 1).

[0063] Like wiring pattern 41, wiring pattern 43 has one end connected to the anode terminal of diode 8, but the other end on the high-voltage transformer 2 side has a length that reaches the area where the upper surface of high-voltage transformer 2 is projected onto high-voltage circuit board 4. Accordingly, induction electrode 7 is formed shorter than induction electrode 7 of ion generating device 100 so that the end on the high-voltage transformer 2 side is located closer to discharge electrode 6.

[0064] Terminals 2 a and 2 b of the high-voltage transformer 2 are different from terminals 2 a and 2 b of the high-voltage transformer 2 of the ion generating device 100 .

[0065] Specifically, terminal 2a is disposed below the other end of wiring pattern 43 on the upper surface of high-voltage transformer 2, and is formed so that its end has a length that penetrates high-voltage circuit board 4. As a result, terminal 2a, wiring pattern 43, diode 8, and wiring pattern 42 form a first conductive path. In addition, terminal 2a, a wiring pattern (not shown) connecting terminal 2a and diode 9, diode 9, and a wiring pattern (not shown) connecting diode 9 and a discharge electrode form the first conductive path.

[0066] Terminal 2b is disposed at a corner diagonally opposite to the corner at which terminal 2a is provided on the top surface of high-voltage transformer 2, and is formed short like terminal 2a in ion generating device 100. For this reason, terminal 2b and induction electrode 7 are connected by lead wire 13.

[0067] Lead wire 13 is disposed below high-voltage circuit board 4, extending from terminal 2b to the vicinity of terminal 2a, and then facing wiring pattern 43, more preferably approximately parallel to wiring pattern 43, and extending to a straight portion of induction electrode 7 near diode 8. An end of lead wire 13 is connected to the straight portion of induction electrode 7. As a result, terminal 2b, lead wire 13, and induction electrode 7 form a second conductive path.

[0068] In the ion generating device 100A configured as described above, the wiring pattern 43 that constitutes part of the first conductive path and the lead wire 13 that constitutes the second conductive path face each other (preferably substantially parallel to each other), so that noise can be reduced, similarly to the ion generating device 100.

[0069] [Embodiment 3] The third embodiment of the present invention will be described below with reference to Fig. 7. For ease of explanation, components having the same functions as those described in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0070] FIG. 7 is a plan view showing the configuration of an ion generating device 100B according to this embodiment.

[0071] In this embodiment, differences from ion generating device 100 of the above-described first embodiment will be mainly described.

[0072] 7, ion generating device 100B of the present embodiment differs from ion generating device 100 in that the positions of terminals 2a, 2b of high-voltage transformer 2 are swapped. Accordingly, induction electrode 7 has connection portion 7a extending from a part on the discharge electrode 6 side to terminal 2b so as to be connected to terminal 2b protruding from the surface of high-voltage circuit board 4. Ion generating device 100B also has lead wire 16 instead of lead wire 11 (see FIG. 1).

[0073] Lead wire 16 connects terminal 2b and wiring pattern 41 in the same manner as lead wire 11, but is arranged along a different path. Lead wire 16 is arranged below induction electrode 7, facing induction electrode 7.

[0074] As a result, lead wire 16 is longer than lead wire 11, and can be closer to induction electrode 7. This makes it possible to lengthen the section in which lead wire 16 and induction electrode 7 are substantially parallel to each other, thereby further improving the noise reduction effect.

[0075] [Embodiment 4] The fourth embodiment of the present invention will be described below with reference to Figures 8 to 10. For ease of explanation, components having the same functions as those described in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0076] Fig. 8 is a plan view showing the configuration of an ion generating device 100C according to this embodiment. Fig. 9 is a longitudinal cross-sectional view showing a cross-sectional structure along the longitudinal direction of ion generating device 100C. Fig. 10 is a cross-sectional view taken along line BB in Fig. 9. For ease of explanation, high-voltage circuit board 4 and drive circuit board 3 are omitted in Fig. 8.

[0077] In this embodiment, differences from ion generating device 100 of the above-described first embodiment will be mainly described.

[0078] As shown in FIGS. 8 to 10, an ion generating device 100C of the present embodiment differs from ion generating device 100 in that housing 1 has a wire holding portion 1c.

[0079] The wiring holding portion 1c is provided at an arbitrary position on the arrangement path of the lead wire 11 on the inner wall of the housing 1. The wiring holding portion 1c is preferably provided at a position where it can hold the lead wire 11 just before the position where the lead wire 11 extending from the terminal 2a to the high-voltage circuit board 4 side becomes substantially parallel to the back surface of the high-voltage circuit board 4. The wiring holding portion 1c is formed in a concave shape so as to receive the lead wire 11 from below. In addition, the upper end of the wiring holding portion 1c is in contact with the back surface of the high-voltage circuit board 4. In this way, the wiring holding portion 1c holds the lead wire 11 together with the high-voltage circuit board 4 so as not to slip out of the wiring holding portion 1c.

[0080] According to the ion generating device 100C configured as above, since the lead wire 11 is held in the housing 1 by the wire holding portion 1c, even the lead wire 11 having the flexibility described above can be kept in a constant posture. Moreover, even the lead wire 11 having a hardness described above can be easily kept in a constant posture. This makes it easy to make the lead wire 11 and the induction electrode 7 face each other.

[0081] The wiring holding portion 1c can be adapted to hold the conductor 14 in the modified example of the embodiment 1 and the lead wires 13, 16 of the ion generating devices 100A, B of the embodiments 2 and 3. For this purpose, the wiring holding portion 1c is formed in a position and shape corresponding to the respective positions and shapes of the conductor 14 and the lead wires 13, 16.

[0082] [Embodiment 5] Further, the fifth embodiment of the present invention will be described below with reference to Fig. 11. For convenience of explanation, the components having the same functions as those described in the first to fourth embodiments are denoted by the same reference numerals, and the description thereof will be omitted.

[0083] FIG. 11 is a plan view showing a schematic configuration of an air purifier 200 (electrical device) according to this embodiment.

[0084] 11, air purifier 200 includes ion generating device 101 and air blower 201. Ion generating device 101 is any one of ion generating device 100A to 100C in the first to third embodiments.

[0085] Air blower 201 generates a flow of air in the direction shown by the arrow in FIG.

[0086] In the air purifier 200 configured in this manner, ions generated by discharge between the discharge electrodes 5, 6 and the induction electrode 7 are carried by the air flow generated by the air blower 201 and are sent out.

[0087] Air purifier 200 can be configured to be smaller and less expensive than air purifiers equipped with conventional ion generating devices by including ion generating device 101. Even if air purifier 200 cannot be equipped with a conventional ion generating device due to its size, ion generating device 101 can be installed.

[0088] In the present embodiment, an example in which ion generating device 101 is mounted on air purifier 200 has been described, but ion generating device 101 may also be mounted on electrical appliances such as air conditioners, vacuum cleaners, refrigerators, washing machines, and dryers other than air purifier 200. As with air purifier 200, such electrical appliances can also be configured to be smaller and less expensive than electrical appliances equipped with conventional ion generating devices.

[0089] 〔summary〕 The discharge device of aspect 1 of the present invention comprises a transformer, a discharge electrode connected to a first terminal on the secondary side of the transformer, and an induction electrode that generates a discharge product between the discharge electrode and is connected to a second terminal on the secondary side of the transformer, wherein a first conductive path including the first terminal and extending from the first terminal to the discharge electrode and a second conductive path including the second terminal and the induction electrode are partially adjacent to and opposed to each other.

[0090] According to the above configuration, since the secondary side of the transformer is not grounded, the waveforms of the voltages appearing at the first terminal and the second terminal of the transformer are in opposite phase. Therefore, the noise generated in the first conductive path and the noise generated in the second conductive path are also in opposite phase. Therefore, since the first conductive path and the second conductive path are partially opposed to each other, at least a part of the noise generated therein cancels out each other. Therefore, it is not necessary to use a shield or the like to block noise. It is possible to realize a small-sized discharge device capable of reducing noise.

[0091] A discharge device according to a second aspect of the present invention is based on the first aspect, and may be arranged such that the first conductive path and the second conductive path are partially approximately parallel to each other in adjacent and opposing portions.

[0092] According to the above configuration, the effect of canceling out noises is enhanced in the portion where the first conductive path and the second conductive path are parallel to each other.

[0093] A third aspect of the present invention is directed to the discharge device of the second aspect, wherein the first conductive path or the second conductive path includes a wiring member.

[0094] According to the above configuration, the first conductive path and the second conductive path can be easily opposed to each other by appropriately adjusting the arrangement and shape of the wiring member.

[0095] A discharge device according to a fourth aspect of the present invention may be configured in such a manner that, in the third aspect, the wiring member is a lead wire covered with an insulating covering member.

[0096] According to the above configuration, since the lead wires are insulated, it is possible to prevent short-circuit failures caused by the lead wires coming into contact with surrounding wiring patterns or the like.

[0097] A discharge device according to a fifth aspect of the present invention may be configured in such a manner that, in the third aspect, the wiring member is a plate-shaped conductor.

[0098] According to the above configuration, the plate-shaped conductor can widen the range in which the first conductive path and the second conductive path face each other.

[0099] The discharge device of aspect 6 of the present invention, in any one of aspects 3 to 5 above, may further include a housing that houses the transformer, the discharge electrode, the induction electrode, the first conductive path, and the second conductive path, and the housing may have a wiring holding portion that holds the wiring member.

[0100] According to the above configuration, since the wiring member is held in the housing, the position of the wiring member can be kept constant, which makes it easy to make the first conductive path and the second conductive path face each other.

[0101] A discharge device according to a seventh aspect of the present invention, in any one of the third to fifth aspects above, may further include a diode that half-wave rectifies the AC voltage output from the transformer, the discharge electrode being connected to the first terminal via the diode, the wiring member connecting the first terminal and the diode, and the wiring member and the second conductive path being partially adjacent to and opposing each other.

[0102] In the first conductive path, a portion from the diode to the discharge electrode may not face the second conductive path depending on the arrangement of the diode. In contrast, with the above configuration, the wiring member can make the first conductive path and the second conductive path close to each other and face each other in part.

[0103] The discharge device according to an eighth aspect of the present invention is any one of the first to seventh aspects, and may further include a single substrate on which the discharge electrode and the induction electrode are provided.

[0104] According to the above configuration, since the discharge electrode and the induction electrode are provided on a single substrate, the number of components can be reduced compared to when the discharge electrode and the induction electrode are each formed on separate substrates, thereby reducing the cost of the discharge device.

[0105] An electric device according to a ninth aspect of the present invention includes the discharge device according to any one of the first to eighth aspects.

[0106] According to the above configuration, it is possible to reduce the size and noise of the electrical device.

[0107] [Additional Notes] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. The technical scope of the present invention also includes embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Furthermore, new technical features can be formed by combining the technical means disclosed in the respective embodiments. [Explanation of symbols]

[0108] 1 Case 1c Wire holding part 2 High-voltage transformer (transformer) 2a terminal (first terminal, first conductive path) 2b terminal (second terminal, second conductive path) 4 High voltage circuit board (substrate) 5,6 Discharge electrode 7 Induction electrode (second conductive path) 8,9 Diode (first conduction path) 11 Lead wire (wiring member, first conductive path) 41 to 43 Wiring pattern (first conductive path) 100, 100A~100C, 101 Ion generator (discharge device) 200 Air purifier (electrical equipment)

Claims

1. A transformer, a first conductive path connected to a first terminal on a secondary side of the transformer; a second conductive path connected to a second terminal of the secondary side of the transformer; a discharge electrode electrically connected to the first terminal via the first conductive path, one of the first conductive path and the second conductive path includes a lead wire; the other of the first conductive path and the second conductive path includes a conductive pattern provided on a substrate, the lead wire is disposed so that a portion of the lead wire is parallel to a portion of the conductive pattern; the lead wire is disposed so as to overlap a portion of the conductive pattern in the thickness direction of the substrate; Discharge device.

2. A transformer, a first conductive path connected to a first terminal on a secondary side of the transformer; a second conductive path connected to a second terminal of the secondary side of the transformer; a discharge electrode electrically connected to the first terminal via the first conductive path, one of the first conductive path and the second conductive path includes a lead wire; the other of the first conductive path and the second conductive path includes a conductive pattern provided on a substrate, the lead wire is disposed so that a portion of the lead wire is parallel to a portion of the conductive pattern; The shortest distance between a portion of the lead wire and a portion of the conductive pattern is in the range of more than 0 mm and not more than 10 mm. Discharge device.

3. A transformer, a first conductive path connected to a first terminal on a secondary side of the transformer; a second conductive path connected to a second terminal of the secondary side of the transformer; a discharge electrode electrically connected to the first terminal via the first conductive path, one of the first conductive path and the second conductive path includes a lead wire; the other of the first conductive path and the second conductive path includes a conductive pattern provided on a substrate, the lead wire is disposed so that a portion of the lead wire is parallel to a portion of the conductive pattern; further comprising an electrical insulating member interposed between a portion of the lead wire and a portion of the conductive pattern. Discharge device.

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