JP7450308B1 - discharger - Google Patents

Abstract

The present invention provides a technology for reducing noise that affects sound quality in ground reinforcement. [Solution] A discharger attached to the ground of an electric circuit including an audio circuit, which has a terminal part connected to the ground on one side, and discharges one of a bundle of multiple linear conductors on the other side. The terminal portion and the emitting portion are electrically connected via the intermediate portion, the intermediate portion is covered with an insulator, and the emitting portion has a protruding portion that spreads radially. . [Selection diagram] Figure 1

Description

The present invention relates to a discharger attached to the ground of an electronic device including an audio circuit, and more particularly to a technique for improving the quality of audio using a discharger.

Conventionally, in order to improve the sound quality of audio circuits, the ground has been strengthened or a virtual ground has been used.
However, there is a limit to how much the ground can be strengthened within the limited space of the housing. Furthermore, improvements using virtual earthing often cannot adequately address the deterioration in sound quality caused by high-frequency component noise.
Therefore, there was a need for a technology that would reduce the deterioration in sound quality caused by high-frequency component noise in relation to the ground area.

Various techniques have been proposed in the past to address such problems. For example, a technology (see Patent Document 1) that connects a virtual ground material to a line has been proposed and has become a publicly known technology. More specifically, the virtual earth material is made of a mixture containing aramid fibers, aluminosilicate, calcium silicate, amorphous silica, activated carbon, and powdered rubber, and contains synthetic zeolite as the aluminosilicate.
However, there is no mention of improvement in sound quality due to high-frequency component noise, and the problem described above is not solved.

Patent No. 7252687

In view of the problem of improving sound quality deterioration caused by noise in audio equipment, the present invention solves the problem by removing noise within the equipment by attaching a discharger to the ground of the equipment or the ground of a virtual earth. It is something to be solved.

In order to solve the above problems, the present invention has a terminal portion connected to the ground on one side, a brush portion in which one of a bundle of at least three linear conductors is assembled on the other side, and a terminal portion The brush portion is electrically connected to the brush portion through the intermediate portion, the intermediate portion is covered with an insulator, and the brush portion extends radially.

Further, the present invention adopts a method in which the linear conductor is made of a plurality of thicknesses, and the material or coating state is different for each thickness.

Further, the present invention provides a first linear conductor in which the linear conductor is made of uncoated high-purity oxygen-free copper wire, and a silver-coated high-purity oxygen-free copper wire that is thinner than the first conductor. A method consisting of a second linear conductor made of a wire is adopted.

Further, in the present invention, the intermediate part is composed of a coaxial cable, the terminal part is connected to an internal conductor and an external conductor of the coaxial cable, the brush part is connected to an internal conductor of the coaxial cable, and the brush part is connected to an internal conductor of the coaxial cable. It consists of a conductor and a group of linear conductors, one of which is stranded and the other radial, and there are a plurality of groups of linear conductors, and the inner conductor and the group of linear conductors are caulked with a ring sleeve.

Further, the present invention employs a means in which a virtual earth is connected between the ground and the discharger.

According to the discharge device according to the present invention, by connecting the discharge device to the ground of a device including an audio device, noise within the device is removed and sound quality is improved.

FIG. 1 is a system diagram showing an embodiment of a discharger according to the present invention. 1 is an overall view of a discharger showing an embodiment of the discharger according to the present invention. FIG. 1 is a schematic cross-sectional view of a discharger showing an embodiment of the discharger according to the present invention. 1 is a diagram showing an assembly process of a discharger showing an embodiment of the discharger according to the present invention. It is a figure showing other embodiments of the discharger concerning the present invention.

The greatest feature of the discharge device according to the present invention is that it can improve sound quality by removing noise within the device. Examples will be described below based on the drawings.
Note that the overall shape and the shape of each part of the discharger shown in this example are not limited to the example described below, and are within the scope of the technical idea of the present invention, that is, exhibiting the same function and effect. The shape and dimensions can be changed within the range of possible changes.

The present invention will be explained according to FIGS. 1 to 4.
FIG. 1 is a system diagram showing an embodiment of a discharger according to the present invention.
FIG. 2 is an overall view of a discharge device showing an embodiment of the discharge device according to the present invention, in which (a) is a case where a single linear conductor is used, and (b) is a case where a plurality of types of wires are used. (c) is the case where a coaxial cable is used in the intermediate portion. FIG. 3 is a schematic cross-sectional view of a discharger using a coaxial cable among the dischargers according to the present invention.
FIG. 4 is a diagram showing an assembly process of a discharger according to an embodiment of the present invention, with (a) to (c) showing the assembly process, and (d) a completed view.

The discharger 1 is connected to the ground and releases unnecessary noise components contained in the ground into space in the form of discharge.
The discharger 1 includes a terminal section 10, an intermediate section 20, and a brush section 30.
More specifically, it is a discharger that is attached to the ground of an electric circuit including an audio circuit, and has a terminal section connected to the ground on one side, and a discharge section made of multiple conductors on the other side, and has a terminal section and a discharge section connected to the ground. the parts are electrically connected via the intermediate part,
The middle part is covered with an insulator, and the emitting part has a radially extending protrusion.

The terminal portion 10 is a portion that connects the discharger 1 to ground. Specifically, it is a screw portion of the frame ground 62 of the audio device 21 or a portion connected to the discharger side connection portion 72 of the virtual ground 70.
The shape may be any shape as long as it is called an electrode terminal, but generally a U-shape or a ring-shape is considered. In this embodiment, it is U-shaped. This is because connection can be made simply by loosening the fixing portion of the other party, and attachment and detachment are easy.
When the threaded portion of the frame ground 62 or the discharger side connecting portion 72 of the virtual ground 70 is composed of a male thread and a female thread, a suitable shape is such that it can be easily held between both screws and is difficult to fall off.
The terminal section 10 includes a crimp section 11 . It has the shape of a ring or the like, and is a portion that integrates the terminal portion 10 and the wire and makes them electrically conductive by sandwiching the wire and crimping with a crimping tool or the like.
The crimp portion 11 fixes one of the electric wires 21 of the intermediate portion 20 and connects the electric wire 21 and the terminal portion 10 to each other.
In this embodiment, the connection was made by crimping, but soldering, welding, etc. may also be used.

The intermediate portion 20 is a portion that connects the terminal portion 10 and the brush portion 30. It has a structure in which the terminal part 10 and the brush part 30 are electrically connected by an electric wire 21, and the periphery is covered with an insulating part 50. The end portion of the insulating portion 50 is closed with hot bond 52 without any gap. Since the gap is closed with the hot bond 52, the intermediate portion 20 is completely covered with the insulator.
If the intermediate section 20 is not covered with an insulating material, the noise originally emitted from the brush section will be emitted from the intermediate section 20 toward the frame ground 62 and the virtual ground 70 that are relatively close to the intermediate section. Noise may return to ground. By covering the intermediate portion 20 with an insulating material, noise can be emitted only from the brush portion.
As the insulating part 50, a heat shrink tube 51 is suitable. The heat-shrinkable tube 51 is a tube that shrinks when exposed to hot air of about 120 degrees.
By heating, it shrinks and the gap at the end of the insulating part 50 can be reduced.

The electric wire 21 may be used as a linear conductor 40 and extended to the brush portion 30 to form a brush portion. Alternatively, the brush-side end of the electric wire 21 may be connected to a linear conductor 40, and the linear conductor 40 may constitute a brush portion.
Further, instead of the general electric wire 21, a coaxial cable 22 may be used. By using the coaxial cable 22, noise including high frequencies can be efficiently sent to the brush section 30.

The brush section 30 is a discharge section 46 that radiates noise components that have flowed into the discharger 1 from the ground of the audio device 21 .
It consists of a bundle of at least three or more linear conductors 40, one of which is gathered together and the other of which is spread out radially. Noise components on the ground are radiated from the terminal section 10 through the intermediate section 20 and at the brush section 30.
In order to increase the amount of radiation, the ends of the linear conductors 40 are arranged radially about 3 cm apart. Overall, it has a hemispherical shape. With such a shape, it is possible to discharge efficiently and reduce noise components in the ground.

The linear conductor 40 is composed of a copper wire with a diameter of approximately 1 mm or less. Since this embodiment concerns minute noise components, the lower the resistance value of the copper wire, the better. For example, high purity oxygen-free copper wire is suitable.
Furthermore, the larger the diameter of the copper wire, the more the resistance value can be suppressed, so by increasing the diameter, the overall amount of noise transmitted can be increased. Furthermore, the smaller the diameter of the copper wire, the larger the surface area becomes. Therefore, by reducing the diameter, the transmission efficiency of high-frequency noise can be increased.
Therefore, a plurality of types of linear conductors 40 having different diameters can emit noise in more bands than a single type of linear conductor 40.
In this example, a high-purity oxygen-free copper wire with a diameter of 0.5 mm is used as the first linear conductor, and a silver-coated high-purity oxygen-free copper wire with a diameter of 0.1 mm is used as the second linear conductor. is used.
Since the first linear conductor has a relatively large copper wire diameter, it is possible to radiate the entire noise. Since the diameter of the copper wire is relatively small, the second linear conductor can radiate noise with higher frequency components.
The reason why the surface of the second linear conductor is coated with silver is to suppress deterioration due to surface corrosion, etc., since the smaller the diameter of the copper wire, the more susceptible it is to corrosion.

The virtual earth 70 will be explained. Virtual earth 70 strengthens the ground of the audio equipment.
Generally, the larger the volume and surface area of a device ground, the more stable the ground will be. Therefore, in order to pseudo-enlarge the volume and surface area of the ground of the device, a virtual ground 70 is connected.
The frame ground 62 of the audio device 60 and the ground side connection portion 71 of the virtual earth 70 are connected.
The virtual earth 70 has a layer section 73 in which a plurality of metal plates are stacked. This structure increases the volume and surface area of the ground.
The terminal portion 10 of the discharger 1 is connected to the discharger side connection portion 72 of the virtual ground 70 . The discharger 1 removes high frequency noise that cannot be removed by the virtual ground 70.

FIG. 1 shows an example of how a discharger 1 is installed. This is an example via virtual earth 70.
A terminal portion of a frame ground 62 on a chassis 61 of an audio device 60 and a ground side connection portion 71 of a virtual ground 70 are connected with a cable. The terminal portion 10 of the discharger 1 is connected to the discharger side connection portion 72 of the virtual ground 70 .
By connecting the virtual ground 70 to the ground of the audio device 60, the layer section 73 within the virtual ground 70 expands the capacity and surface area of the ground, increasing the stability of the ground.
Noise components flow into virtual ground 70 from audio equipment 60 . Among them, relatively high frequency noise components enter the discharger 1 and are radiated by the brush section 30.
By doing so, part of the high frequency noise components within the audio device 60 is removed, and the sound quality of the audio device 60 can be improved.
Further, although FIG. 1 shows an example through the virtual ground 70, the discharger side connection portion 72 may be directly connected to the frame ground 62.

FIG. 2 shows a front view of the discharger 1. (a) is the basic form. The linear conductor 40 uses only the first linear conductor 41.
Since the first linear conductor 41 is a high-purity oxygen-free copper wire with a diameter of 0.5 mm, it is possible to radiate the entire noise.
The first linear conductor 41 also serves as the electric wire 21 of the intermediate portion 20. Therefore, the length of the first linear conductor 41 is approximately the combined length of the intermediate portion 20 and the brush portion 30.
A portion of the first linear conductor 41 is bundled and placed in the intermediate portion 20 , and its end portion is crimped and fixed by the crimping portion 11 of the terminal portion 10 .
The first linear conductors 41 are bundled up to the end of the intermediate portion 20, and are expanded radially into a generally hemispherical shape by the brush portion 30. By widening them, the distance between each copper wire increases and noise can be radiated efficiently.

(b) is a case where the linear conductor 40 consists of a first linear conductor 41 and a second linear conductor 42. The first linear conductor is a high-purity oxygen-free copper wire with a diameter of 0.5 mm, and the second linear conductor is a silver-coated high-purity oxygen-free copper wire with a diameter of 0.1 mm. By using multiple types of copper wire, more high frequency noise can be radiated. Other structures are the same as in (a).

(c) is a case where the coaxial cable 22 is used in the intermediate portion 20. By using the coaxial cable 22, more noise components containing high frequencies can be emitted from the brush section 30. Details will be described later.

The structure and assembly process when the coaxial cable 22 is used in the intermediate portion 20 will be explained using FIGS. 3 and 4.
Overall, the intermediate part is composed of a coaxial cable, the terminal part is connected to the inner conductor and the outer conductor of the coaxial cable, the brush part is connected to the inner conductor of the coaxial cable, and the brush part is connected to the inner conductor of the coaxial cable. It has a structure consisting of a conductor and a group of linear conductors, one of which is stranded and the other of which is radial.
First, as shown in FIG. 4(a), the terminal portion 10 and the coaxial cable 22 are connected. The coaxial cable 22 is, for example, a 75Ω coaxial cable. The coaxial cable 22 usually includes a core wire 23 (hereinafter also referred to as an inner conductor) used for signals, an insulator 24 surrounding it, and a shield 25 (hereinafter referred to as an outer conductor) disposed to cover the insulator 24. ) and an outer covering 26 (FIG. 3).

The entire length of the coaxial cable 22 is approximately 8 cm, and only the core wire 23 is made to protrude in the direction of the brush portion 30 by approximately 3 to 5 cm. This protruding portion becomes a part of the brush portion 30.
A core wire 23 and a shield 25 are pulled out from the terminal portion 10 side of the coaxial cable 22 and are crimped together at the crimping portion 11 . The shield 25 on the side of the brush part 30 is trimmed so as not to come into contact with the core wire 23 and the brush part 30, and not with other electrical members.
The noise component enters the coaxial cable 22 from the terminal section 10 side. A part of the noise component enters the core wire 23 as a signal using the shield 25 of the coaxial cable 22 as a reference.
The coaxial cable 22 can transmit high frequency components with low attenuation due to the relationship between the core wire 23 and the shield 25.

Next, as shown in FIG. 4(b), the core wire 23, which is an internal conductor, and the plurality of linear conductor groups 44 are caulked with the ring sleeve 31.
The linear conductor group 44 is an assembly of the linear conductors 40, one of which is a twisted wire portion 45 made by twisting the linear conductors 40, and the other is unraveled to form a radial shape.
The linear conductor group 44 consists of a first linear conductor 41 and a second linear conductor 42.
The first linear conductor 41 and the second linear conductor 42 are put together and one end of the wire is twisted to form a twisted wire portion 45 . By forming the wire into a twisted wire portion, it is easy to gather the wires together, and the amount of contact with the core wire 23 can be increased.

Alternatively, a cable made of a wire that meets the requirements, for example, the inner core of a high-grade speaker cable, may be used. By removing the inner core coating, one end is used as the twisted wire part 45, and the other end is loosened to form a radial shape.
Four linear conductor groups 44 are arranged around the core wire 23, covered with a ring sleeve 31, and the ring sleeve 31 is caulked to integrate the core wire 23 and the linear conductor group 44 (FIG. 3).
At this time, by aligning the tips of the core wires 23 with the tips of the linear conductor group 44, the discharge effect by the core wires 23 can be enhanced.

Next, as shown in FIG. 4(c), the intermediate portion 20 is covered with a heat-shrinkable tube 51, which is an insulating portion 50. By covering the intermediate portion 20 with the insulating portion 50, unnecessary radiation from the intermediate portion 20 to the frame ground 62 and the virtual earth 70 near the terminal portion 10 can be prevented.
In order to reduce the gap at the end of the insulating part 50, a heat shrink tube 51 is used as the insulating part 50. By using the heat shrink tube 51 and applying heat, the heat shrink tube 51 comes into close contact with the terminal portion 10, the coaxial cable 22, the ring sleeve 31, and the like. Furthermore, in order to eliminate gaps, hot bond 52 is poured into the gaps (FIG. 3).
A completed example of the discharger 1 is shown in FIG. 4(d).
With such a structure, high frequency noise components can be efficiently radiated.

Another embodiment will be described using FIG. 5. Portions similar to those in Example 1 are omitted. FIG. 5 is a diagram showing the structure of Example 2, in which (a) is a side view, (b) is a perspective view, and (c) is an exploded view.
Although the first embodiment can reduce high-frequency noise components on the ground, it may take time to form many wires radially. Furthermore, performance may be influenced by the radial shape, and there are concerns about uniformity of quality.
Therefore, there has been a need for a structure that can simplify the manufacturing process and ensure uniform performance.

This example will be described along FIG. 5.
The discharger 1 includes a terminal section 10, an intermediate section 20, and a discharge section 46.
The terminal section 10 has substantially the same function as in the first embodiment. The crimp portion 11 and the shaft 27 of the intermediate portion 20 are electrically connected by soldering. This is because the shaft 27 has relatively high rigidity, so it can be fixed more stably by soldering than by mere caulking.

The intermediate portion 20 is a portion that connects the terminal portion 10 and the discharge portion 46.
The intermediate portion consists of a shaft 27, a Teflon (registered trademark) tube 53, and a heat shrink tube 51.
It has a structure in which the terminal part 10 and the emitting part 46 are electrically connected by a shaft 27, and the periphery is covered with an insulating part 50. The length of the shaft 27 is, for example, about 4 cm. If it is too long, the resistance value of the shaft will become a problem, and if it is too short, the discharge part 46 will be too close to the ground, making it difficult to discharge. The length is determined by measurement and consideration.
The shaft 27 is preferably made of copper, which has a low resistance value. By using oxygen-free copper, the resistance value can be further lowered.
Further, the shaft 27 may be hollow. By making it hollow, the surface area of the discharge vessel as a whole can be expanded, which is preferable.
The conductor of the intermediate section 20 is the chassis 27, which is surrounded by a Teflon tube 53. Since the Teflon (registered trademark) tube 53 is strong, it can reinforce the shaft 27. Furthermore, by covering the thermocompression tube 51, the boundary with the terminal 10 and the vicinity of the boundary with the emitting portion 46 can be covered with an insulating material, which is preferable.
Further, as in the first embodiment, both ends of the thermally compressed tube 51 may be closed with hot bonds 52.

The discharge section 46 is an important element in this embodiment. The discharge section 46 performs discharge using a protrusion extending radially from a metallic disc-shaped conductor.
The emission section 46 mainly includes a first disc-shaped conductor 48 and a second disc-shaped conductor 49. The first disc-shaped conductor 48 has, for example, a thickness of about 0.1 mm and a diameter of about 22 mm. It has many protrusions 47 on the circumference and is gear-shaped. In other words, it can be said that it has a radial protrusion 47.
The number of protrusions 47 is, for example, about 50 to 80. The more protrusions 47 there are, the better, but the length of the protrusions 47 themselves is also important, so the number and size of the protrusions 47 are determined by experiments, measurements, etc.
The second disc-shaped conductor 49 is disc-shaped with a plurality of holes. The dimensions are, for example, about 0.4 mm in thickness and 22 mm in diameter. It has a large number of protrusions 47 that are smaller than the first disc-shaped conductor 48 on the circumferential and planar portions.
By having a protrusion different from that of the first disc-shaped conductor 48, noise of a different frequency from that of the first disc-shaped conductor 48 can be emitted.
By adopting a three-layer structure in which two first disc-shaped conductors 48 sandwich a second disc-shaped conductor 49, many noise components can be emitted from the protrusion 47 of the first disc-shaped conductor 48, and the second disc-shaped conductor 48 can emit many noise components. This is preferable because a different noise component can be emitted from the projection 47 of the first disc-shaped conductor 49 than from the projection 47 of the first disc-shaped conductor 48.

A first disc-shaped conductor 48, a second disc-shaped conductor 49, and a first disc-shaped conductor 48 are attached to the tip of the chassis 27 in this order. A spacer 54, which is an insulator, is arranged between each disc-shaped conductor.
By arranging the spacer 54, each disc-shaped conductor is connected only at its center, and the disc-shaped conductors are spaced apart by the thickness of the spacer 54.
The thickness of the spacer 54 is approximately 0.5 mm to 2 mm. If it is thin, a ring washer shape may be considered, and if it is thick, a nut shape is appropriate.
Since at least three or more disc-shaped conductors are arranged at intervals, this has the effect of expanding the surface area of the ground. Furthermore, since the disc-shaped conductor has a plurality of protrusions 47, noise components riding on the ground can be radiated from a large amount of protrusions 47.
Furthermore, by increasing the number of disc-shaped conductors, it is possible to further increase radiation.

The assembly process of this example will be explained.
First, the chassis 27 is covered with a Teflon (registered trademark) tube 53, and the chassis 27 and the crimp portion 11 of the terminal portion 10 are fixed by soldering.
Next, the first disc-shaped conductor 48 , the spacer 54 , the second disc-shaped conductor 49 , the spacer 54 , and the first disc-shaped conductor 48 are assembled in this order and attached to the end of the chassis 27 with screws 55 . The length of the screw 55 is changed as appropriate depending on the distance of the gap between the first disc-shaped conductor 48 and the second disc-shaped conductor 49.
Finally, the heat shrink tube 51 is placed over the intermediate portion 20 to complete the process.
Further, both ends of the heat-shrinkable tube 51 may be covered with hot bond 52 to increase the degree of sealing and insulation of the intermediate portion 20.

In this way, since it is made up of only parts that are easy to shape, it is easy to assemble, and variations in production can be reduced, so that uniform performance can be maintained for each product.

Sound quality was evaluated based on the presence or absence of a discharger (Table 1).
Sound quality evaluation uses tonic evaluation, reverberation evaluation, and three-dimensional effect evaluation, and with the virtual earth 70 connected to the frame ground terminal of the amplifier, whether or not the discharger 1 is connected to the discharger side connection part 72 of the virtual earth 70. The cases were compared.
As a sound quality evaluation item, tonic evaluation was divided into three categories: bass, middle, and treble.
The sound quality evaluation was conducted by six people aged 34 to 64.
Evaluations were made on a four-level scale: S: Very good, A: Good, B: No change, C: Bad.The percentage of people who felt S: Very good was summarized and used as the evaluation.

◎: The percentage of people who felt that the sound quality had greatly improved was 70% or more 〇: The percentage of people who felt that the sound quality had greatly improved was less than 70% and 50% or more △: The percentage of people who felt that the sound quality had greatly improved Less than 50% 40% or more ×: Less than 40% of people felt that the sound quality had greatly improved

As shown in Table 1, the use of a discharger gives a sense of depth to the bass. Furthermore, we were able to clearly demonstrate in our evaluation that the contours of the mid-high tones were well defined, and that both the resonance and three-dimensionality were improved.

As described above, according to the discharger according to the present invention, by connecting the discharger to the ground, a part of the noise in the audio equipment is removed, which improves the sound quality.

Similarly, static electricity generated in audio equipment can be reduced by discharging it.

The discharge device according to the present invention improves the sound quality performance of audio equipment, and can be installed in any audio equipment, whether existing or new, to exhibit its effects. Therefore, it is considered that the industrial applicability of the discharge device according to the present invention is great.

1 Discharge device 10 Terminal part 11 Crimp part 20 Intermediate part 21 Electric wire 22 Coaxial cable 23 Core wire (inner conductor)
24 Insulator 25 Shield (outer conductor)
26 External covering 27 Shaft 30 Brush portion 31 Ring sleeve 40 Linear conductor 41 First linear conductor 42 Second linear conductor 43 Radial portion 44 Linear conductor group 45 Twisted wire portion 46 Discharge portion 47 Projection portion 48 First Disc-shaped conductor 49 Second disc-shaped conductor 50 Insulating section 51 Heat shrink tube 52 Hot bond 53 Teflon (registered trademark) tube 54 Spacer 55 Screw 60 Audio equipment 61 Chassis 62 Frame ground 70 Virtual ground 71 Ground side connection section 72 Electrical side connection part 73 layer part

Claims (9)

A discharger connected to the ground of an electric circuit including an audio circuit,
One side has a terminal part connected to ground,
On the other hand, it has a discharge part consisting of at least three or more conductors,
The terminal portion and the emitting portion are electrically connected via an intermediate portion,
The intermediate portion is covered with an insulator,
A discharger characterized in that the discharge part has a protrusion that spreads radially.
The discharge section is characterized by being composed of at least three or more disc-shaped conductors, the disc-shaped conductors are connected at the center, and the disc-shaped conductors are arranged at regular intervals with spacers. The discharge device according to claim 1.
3. The discharge device according to claim 2, wherein the intermediate portion is made of a hollow conductor. 3. The discharger according to claim 2, wherein at least two of the disc-shaped conductors at both ends have the gear-shaped protrusion.
The discharge part is a brush part in which one of a bundle of at least three or more linear conductors is gathered and connected to the intermediate part,
A discharge device according to claim 1, characterized in that the other end of the bundle is the protrusion and extends radially with respect to one of the bundles.
The linear conductor is made of a plurality of thicknesses,
6. The discharge device according to claim 5, wherein the material or coating state differs depending on the thickness. The linear conductor includes a first linear conductor made of uncoated high-purity oxygen-free copper wire;
7. The discharge device according to claim 6, further comprising a second linear conductor that is thinner than the first conductor and made of silver-coated high-purity oxygen-free copper wire. The intermediate portion is composed of a coaxial cable, and an inner conductor and an outer conductor of the coaxial cable are connected to the terminal portion,
An internal conductor of the coaxial cable is connected to the brush portion,
The brush portion consists of the internal conductor and a group of linear conductors, one of which is stranded and the other radial,
There are multiple groups of linear conductors,
6. The discharge device according to claim 5, wherein the inner conductor and the group of linear conductors are caulked with a ring sleeve. 9. The discharger according to claim 1, wherein a virtual earth is connected between the ground and the discharger.