Microphone

Abstract

A microphone 70 comprises: a grip part 71 which is provided with a charging terminal 73; an antenna shaft 76 which is provided inside the grip part 71 along the longitudinal direction of the grip part 71; a coil-shaped communication antenna 74 which surrounds the antenna shaft 76 inside the grip part 71 and which performs wireless communication; a transmitter-side magnet 72 which is provided in a lower part of the grip part 71; and a magnet fixed part 75 which is provided to the tip of the antenna shaft 76 on the lower side in comparison to the communication antenna 74 and to which the transmitter-side magnet 72 is fixed.

Description

Microphone

[0001] The present invention relates to a microphone having a communication antenna inside.

[0002] Patent Document 1 discloses a charger for a microphone having an insertion hole into which a grip portion of the microphone as a device to be charged is inserted vertically. The insertion hole is provided with a power supply terminal that contacts and supplies power to the charging terminal of the microphone.

[0003] Japanese Patent Application Laid-Open No. 2019-71741

[0004] By the way, in order to make it easier for the charging terminal of the microphone to appropriately contact the power supply terminal, a configuration in which a magnet portion is provided inside the grip portion of the microphone and is adsorbed to the magnet portion of the charger has been considered. Also, it has been considered to provide a communication antenna for wireless communication inside the grip portion of the microphone. However, a configuration in which a magnet portion is disposed near the communication antenna inside the grip portion may reduce the communication quality of the communication antenna due to a change in the magnetic flux of the magnet portion.

[0005] Therefore, the present invention has been made in view of these points, and an object thereof is to suppress a decrease in the communication quality of the communication antenna caused by the magnet portion.

[0006] In one aspect of the present invention, there is provided a microphone including a grip portion provided with a charging terminal, a shaft member provided along the longitudinal direction of the grip portion inside the grip portion, a coil-shaped communication antenna that surrounds the shaft member inside the grip portion and performs wireless communication, a magnet portion provided at the lower portion of the grip portion, and a magnet fixing portion provided at the tip of the shaft member on the lower side of the communication antenna, to which the magnet portion is fixed.

[0007] Also, the shaft member may be provided from one end portion to the other end portion in the longitudinal direction inside the grip portion.

[0008] Also, the communication antenna may be positioned with respect to the shaft member by contacting the outer peripheral surface of the shaft member.

[0009] Furthermore, the magnet fixing portion may be provided between the communication antenna and the magnet portion.

[0010] Furthermore, the magnet portion may be disc-shaped, and the magnet fixing portion may be the end face of one end of the shaft member perpendicular to the longitudinal direction.

[0011] Alternatively, the magnet portion may be sandwiched between the inner wall surface of the lower part of the grip portion and the magnet fixing portion.

[0012] Furthermore, the magnetic portion may be attracted to the charger-side magnetic portion of the charger when the charging terminal comes into contact with the power supply terminal of the charger.

[0013] According to the present invention, the degradation of communication quality of a communication antenna caused by the magnet is suppressed.

[0014] This figure shows a charging system S according to one embodiment. This is a perspective view of the charger 1 from the front. This is a perspective view of the charger 1 from the rear. This is a front view of the charger 1. This is a diagram illustrating the usage of the charger 1. This figure shows the configuration of the bottom surface of the insertion recess 20. This is a schematic diagram showing the positional relationship between the magnet part 40 and the power supply part 30. This figure shows the state in which the charging terminal of the microphone 70 and the power supply terminal are in contact. This figure shows the microphone 70. This figure shows the state in which the charging terminal of the transmitter 80 and the power supply terminal are in contact. This figure shows a modified example of the charging system S. This figure shows the charging case 90.

[0015] <Configuration of the Charging System> The configuration of the charging system S according to one embodiment will be described with reference to Figures 1 to 5.

[0016] Figure 1 is a diagram showing a charging system S according to one embodiment. Figure 2 is a perspective view of the charger 1 from the front. Figure 3 is a perspective view of the charger 1 from the rear. Figure 4 is a front view of the charger 1. Figure 5 is a diagram illustrating the usage of the charger 1. Figure 5(a) shows the charger 1 with the housing 10 positioned horizontally, and Figure 5(b) shows the charger 1 with the housing 10 positioned vertically.

[0017] As shown in Figure 1, the charging system S includes a charger 1, a microphone 70, and a transmitter 80. The charging system S is a system for charging at least one of the devices to be charged, the microphone 70 and the transmitter 80, using the charger 1.

[0018] The microphone 70 is a device that converts sound into electrical signals. The microphone 70 also functions as a transmitter that wirelessly transmits electrical signals to an external receiver. The microphone 70 is a handheld microphone with a grip portion 71 that the user holds in their hand. The microphone 70 has a rechargeable battery inside. The microphone 70 also has a charging terminal that can be connected to the power supply terminal of the charger 1. The charging terminal is located at the bottom of the grip portion 71.

[0019] The transmitter 80 is a device that wirelessly transmits electrical signals to an external receiver. The transmitter 80 also functions as a microphone capable of picking up sound. The transmitter 80 has a rechargeable battery inside. The transmitter 80 also has a charging terminal that can be connected to the power supply terminal of the charger 1. The charging terminal is located on the bottom of the transmitter 80.

[0020] Charger 1 is a device for charging the microphone 70 and the transmitter 80. Specifically, Charger 1 charges the first battery of the microphone 70 and the second battery of the transmitter 80. When the microphone 70, which has a built-in first battery, is attached to Charger 1, Charger 1 charges the first battery, and when the transmitter 80, which has a built-in second battery, is attached to Charger 1, Charger 1 charges the second battery. As shown in Figure 4, Charger 1 has a housing 10, a left insertion recess 20A, a right insertion recess 20B, a left power supply section 30A, and a right power supply section 30B.

[0021] The housing 10 is the main body of the charger 1. Inside the housing 10 are circuits for supplying power to the microphone 70 and the transmitter 80. The housing 10 has, for example, a rectangular parallelepiped shape.

[0022] The housing 10 has a surface on which it is placed, such as a table. In this embodiment, the housing 10 has multiple surfaces on which the charger 1 can be used in both horizontal and vertical orientations.

[0023] Specifically, when the housing 10 is placed horizontally, as shown in Figure 5(a), the lower surface 11a of the housing 10 becomes the first mounting surface that is placed on the mounting base 100. On the other hand, when the housing 10 is placed vertically, as shown in Figure 5(b), the rear surface 12a of the housing 10 becomes the second mounting surface that is placed on the mounting base 100. The second mounting surface is a surface perpendicular to the first mounting surface.

[0024] As shown in Figure 3, the lower surface 11a of the housing 10 is provided with lower protrusions 11b. The lower protrusions 11b contact the mounting base 100 when the charger 1 is placed on the mounting base 100 in a horizontal position. The lower protrusions 11b are projections that protrude from the lower surface 11a in a direction normal to the surface. As an example, the lower protrusions 11b are provided at the four corners of the lower surface 11a. The height of the four lower protrusions 11b is the same.

[0025] As shown in Figure 3, a rear projection 12b is provided on the rear surface 12a of the housing 10. The rear projection 12b contacts the mounting base 100 when the charger 1 is placed vertically on the mounting base 100. The rear projection 12b is a projection that protrudes from the rear surface 12a in the direction normal to the surface. As an example, the rear projection 12b is provided at the four corners of the rear surface 12a. The height of the four rear projections 12b is the same.

[0026] As shown in Figure 3, the lower surface 11a of the housing 10 is provided with two engaging recesses 11c. The two engaging recesses 11c are located at both ends of the housing 10 in the left-right direction. When the housing 10 is installed vertically on a wall or the like, the engaging recesses 11c engage with hooks provided on the wall. This makes it easier to install the charger 1 at any position on the wall.

[0027] As shown in Figure 1, the left insertion recess 20A and the right insertion recess 20B are the parts into which the microphone 70 and transmitter 80 are inserted during charging. The left insertion recess 20A and the right insertion recess 20B are recessed along the front-to-back direction from the front to the back 12a of the housing 10. In Figure 1, the microphone 70 is inserted into the left insertion recess 20A, and the transmitter 80 is inserted into the right insertion recess 20B. Specifically, the lower part of the microphone 70 is inserted sideways into the left insertion recess 20A, and the lower part of the transmitter 80 is inserted sideways into the right insertion recess 20B.

[0028] However, the above is not limited to the above; the transmitter 80 can be inserted into the left insertion recess 20A, and the microphone 70 can be inserted into the right insertion recess 20B. In other words, either the microphone 70 or the transmitter 80 can be inserted into the left insertion recess 20A, and either the microphone 70 or the transmitter 80 can be inserted into the right insertion recess 20B. For this reason, the microphone 70 may be inserted into both the left insertion recess 20A and the right insertion recess 20B.

[0029] As mentioned above, the housing 10 can be placed horizontally or vertically. When the housing 10 is placed horizontally (specifically, when the bottom surface 11a is in contact with the mounting base 100), the microphone 70 and transmitter 80 are inserted into the left insertion recess 20A and the right insertion recess 20B in a lying position. When the housing 10 is placed vertically (specifically, when the rear surface 12a is in contact with the mounting base 100), the microphone 70 and transmitter 80 are inserted into the left insertion recess 20A and the right insertion recess 20B in an upright position.

[0030] The left power supply unit 30A is located in the left insertion recess 20A, as shown in Figure 4. Specifically, the left power supply unit 30A is located on the bottom surface of the left insertion recess 20A. When the microphone 70 is inserted into the left insertion recess 20A, the left power supply unit 30A contacts the charging terminal located at the bottom of the microphone 70 to supply power. Also, when the transmitter 80 is inserted into the left insertion recess 20A, the left power supply unit 30A contacts the charging terminal located at the bottom of the transmitter 80 to supply power.

[0031] The right power supply unit 30B is located in the right insertion recess 20B, as shown in Figure 4. Specifically, the right power supply unit 30B is located on the bottom surface of the right insertion recess 20B. When the microphone 70 is inserted into the right insertion recess 20B, the right power supply unit 30B contacts the charging terminal of the microphone 70 to supply power. Also, when the transmitter 80 is inserted into the right insertion recess 20B, the right power supply unit 30B contacts the charging terminal of the transmitter 80 to supply power.

[0032] Incidentally, when the housing 10 is placed vertically, the microphone 70 and transmitter 80 are inserted vertically into the left insertion recess 20A and the right insertion recess 20B. Here, we will explain the case when the microphone 70 is inserted into the left insertion recess 20A. When the microphone 70 is inserted into the left insertion recess 20A, it tends to move downward due to its own weight. Therefore, when the housing 10 is placed vertically, the charging terminal of the microphone 70 tends to come into contact with the power supply terminal of the left power supply unit 30A, and the left power supply unit 30A can properly charge the first battery of the microphone 70. On the other hand, when the housing 10 is placed horizontally, the microphone 70 is inserted into the left insertion recess 20A in a lying position. In this case, the insertion direction of the microphone 70 is perpendicular to the vertical direction in which its own weight acts, so the microphone 70 does not tend to move within the left insertion recess 20A, and the user needs to insert the microphone 70 all the way into the left insertion recess 20A. If the microphone 70 is not inserted properly, the charging terminal of the microphone 70 will not make contact with the power supply terminal of the left power supply unit 30A, and the left power supply unit 30A will not be able to properly charge the first battery of the microphone 70.

[0033] Therefore, in this embodiment, in order to ensure that the left power supply unit 30A and the right power supply unit 30B properly supply power to the microphone 70 and transmitter 80 even when the housing 10 is placed horizontally, a magnetic unit 40 (see Figure 7) is provided to attract the microphone 70 and transmitter 80. The magnetic unit 40 is provided near the left power supply unit 30A in the left insertion recess 20A and near the right power supply unit 30B in the right insertion recess 20B. As a result, even when the housing 10 is placed horizontally, the microphone 70 and transmitter 80 are attracted to the magnetic unit 40, so that the power supply terminals of the left power supply unit 30A and the right power supply unit 30B make proper contact with the charging terminals of the microphone 70 and transmitter 80.

[0034] <Detailed Configuration of Insertion Recess, Power Supply Unit, and Magnet Unit> The detailed configuration of the insertion recess 20, power supply unit 30, and magnet unit 40 will be explained with reference to Figures 6 to 10.

[0035] Figure 6 shows the configuration of the bottom surface of the insertion recess 20. Figure 7 is a schematic diagram showing the positional relationship between the magnet part 40 and the power supply part 30. Figure 8 shows the state in which the charging terminal and the power supply terminal of the microphone 70 are in contact. Figure 9 shows the microphone 70. Figure 10 shows the state in which the charging terminal and the power supply terminal of the transmitter 80 are in contact. Note that in Figures 8 and 10, the internal configurations of the microphone 70 and transmitter 80 are simplified for ease of explanation. Also, in Figure 9, the lower case 71a of the microphone 70 (see Figure 8) has been removed.

[0036] The configurations of the left insertion recess 20A and the right insertion recess 20B are the same. Similarly, the configurations of the left power supply section 30A and the right power supply section 30B are also the same. Therefore, in the following, the left insertion recess 20A and the right insertion recess 20B will be collectively referred to as the insertion recess 20, and the left power supply section 30A and the right power supply section 30B will be collectively referred to as the power supply section 30, and the detailed configurations of the insertion recess 20 and the power supply section 30 will be described.

[0037] The insertion recess 20 is formed to form a predetermined angle with respect to the vertical and horizontal directions (see Figure 2). Specifically, the insertion recess 20 is inclined at a predetermined angle with respect to the horizontal plane such that the bottom surface is lower in the vertical direction. Therefore, when the housing 10 is placed on its side (when the bottom surface 11a is in contact with the mounting base 100), the bottom surface of the insertion recess 20 is located downwards. This configuration, in which the insertion recess 20 is formed at an angle, makes it easier to insert the microphone 70 and transmitter 80 along the insertion recess 20 when the housing 10 is placed on its side. However, the above is not limited to the above, and the insertion recess 20 may also be provided on the housing 10 so as to be parallel to the horizontal direction.

[0038] The insertion recess 20 is formed by a first recess 22 (Figure 6) into which the microphone 70 is inserted and a second recess 25 into which the transmitter 80 is inserted. The first recess 22 is a circular recess corresponding to the outer shape of the grip portion 71 of the microphone 70, and the second recess 25 is a rectangular recess corresponding to the outer shape of the case of the transmitter 80. The second recess 25 is wider than the first recess 22 and surrounds the first recess 22. Specifically, the first recess 22 is located in the center of the insertion recess 20 and forms part of the second recess 25.

[0039] As shown in Figure 6, the power supply unit 30 is provided around the bottom surface of the insertion recess 20. Specifically, the power supply unit 30 is provided so as to be exposed from the bottom surface of the insertion recess 20. The power supply unit 30 has a first power supply unit 32 and a second power supply unit 35.

[0040] As shown in Figure 8, the first power supply unit 32 supplies power by contacting the charging terminal 73 located at the bottom of the microphone 70. The first power supply unit 32 has a power supply terminal that can contact the charging terminal 73 of the microphone 70. The power supply terminal is, in this case, a power supply pin protruding from the first bottom surface 23a of the first recess 22. When the microphone 70 is mounted in the first recess 22, the power supply pin comes into contact with the charging terminal 73.

[0041] As shown in Figure 10, the second power supply unit 35 supplies power by contacting the charging terminal 83 located at the bottom of the transmitter 80. The second power supply unit 35 has a power supply terminal that can contact the charging terminal 83 of the transmitter 80. The power supply terminal is, in this case, a power supply pin protruding from the bottom surface 33 of the second recess 25. When the transmitter 80 is mounted in the second recess 25, the power supply pin comes into contact with the charging terminal 83. As shown in Figure 6, the second power supply unit 35 is provided on both sides of the first power supply unit 32. Specifically, the second power supply unit 35 is provided in positions symmetrical to the first power supply unit 32 when viewed from the left and right.

[0042] The magnet section 40 is located in the insertion recess 20 next to the power supply section 30. Specifically, as shown in Figure 7, the magnet section 40 is located next to the power supply section 30 on the bottom surface of the insertion recess 20 when the insertion recess 20 is viewed from above. The magnet section 40 attracts the lower part of the microphone 70 or the lower part of the transmitter 80. The magnet section 40 is located around the bottom surface of the insertion recess 20. However, unlike the power supply section 30, the magnet section 40 is not exposed from the bottom surface of the insertion recess 20. Specifically, the magnet section 40 is located on the underside of the bottom surface of the insertion recess 20. The magnet section 40 has a first magnet section 42 and a second magnet section 45.

[0043] As shown in Figure 8, the first magnet portion 42 is provided in the first recess 22 and attracts the lower part of the microphone 70 inserted into the first recess 22. Specifically, the first magnet portion 42 is provided on the back side of the second bottom surface 23b of the first recess 22. The first magnet portion 42 is located on the back side of the center of the second bottom surface 23b. The second bottom surface 23, together with the first bottom surface 23a, forms the bottom surface of the first recess 22. The second bottom surface 23b is located at a lower position than the first bottom surface 23a, creating a step in the bottom surface of the first recess 22. The first magnet portion 42 is formed in a circular shape here and is larger than the first power supply portion 32.

[0044] At the lower part of the grip portion 71 of the microphone 70, as shown in FIG. 8, a transmitter-side magnet 72 is provided. Specifically, the transmitter-side magnet 72 is provided at one end in the longitudinal direction of the grip portion 71 inside the grip portion 71. More specifically, the transmitter-side magnet 72 is provided on the back side of the lower end surface at the lower part of the microphone 70. When the microphone 70 is inserted into the first recess 22, the first magnet portion 42 faces the transmitter-side magnet 72 with the second bottom surface 23b of the first recess 22 and the lower end surface of the microphone 70 interposed therebetween. The polarity of the side of the transmitter-side magnet 72 facing the first magnet portion 42 is opposite to the polarity of the side of the first magnet portion 42 facing the transmitter-side magnet 72. Therefore, an attractive force is generated between the transmitter-side magnet 72 and the first magnet portion 42, and the lower part of the microphone 70 is attracted toward the first magnet portion 42 side. At this time, the power supply-side terminal of the first power supply portion 32 contacts the charging terminal 73 of the microphone 70.

[0045] At the lower part of the grip portion 71 of the microphone 70, a communication antenna 74 for sending a wireless signal to the outside is provided. The communication antenna 74 has, for example, a coil shape as shown in FIG. 9, and is arranged so as to surround an antenna shaft 76 which is a shaft member provided at the lower part of the grip portion 71. The antenna shaft 76 is provided from one end to the other end in the longitudinal direction inside the grip portion 71. The coil of the communication antenna 74 is in contact with the outer peripheral surface of the antenna shaft 76 and is positioned with respect to the antenna shaft 76. However, it is not limited to the above, and the coil of the communication antenna 74 may not be in contact with the outer peripheral surface of the antenna shaft 76, and there may be a gap between the coil and the outer peripheral surface. A magnet fixing portion 75 is provided at the tip on the lower side of the microphone 70 of the antenna shaft 76. The magnet fixing portion 75 is an end face of the antenna shaft 76. The end face is a surface orthogonal to the longitudinal direction (axial direction) of the antenna shaft 76. The disk-shaped transmitter-side magnet 72 is fixed to the magnet fixing portion 75 with, for example, an adhesive or a strong double-sided tape. Further, the transmitter-side magnet 72 is sandwiched between the inner wall surface at the lower part of the grip portion 71 and the magnet fixing portion 75.

[0046] When the communication antenna 74 and the transmitter-side magnet 72 are located close together, the transmitter-side magnet 72 will be attracted to the communication antenna 74, negatively affecting the communication quality of the communication antenna 74. In contrast, by providing a magnet fixing part 75 between the communication antenna 74 and the transmitter-side magnet 72, the positional relationship between the communication antenna 74 and the transmitter-side magnet 72 is fixed, eliminating fluctuations and biases in magnetic flux. This configuration suppresses the deterioration of the communication quality of the communication antenna 74. As a result, the communication antenna 74 can communicate properly.

[0047] The relationship between the communication antenna and the magnet will be further explained below. A coil-shaped communication antenna is affected by electromagnetic induction caused by fluctuations in magnetic flux. Therefore, it was difficult to place the magnet at the lower end of a microphone equipped with a communication antenna. In addition, in a handheld microphone equipped with a wireless transmission function, the transmitting antenna and rechargeable battery are located at the bottom of the microphone due to the shape of the microphone. Therefore, it was difficult to use a charging fixing means that utilizes the attractive force of a magnet for charging a handheld microphone. In contrast, in this embodiment, the magnet fixing part 75 fixes the transmitter-side magnet 72 to approximately the center of the communication antenna 74. Because the transmitter-side magnet 72 is fixed to the magnet fixing part 75, the magnetic flux of the transmitter-side magnet 72 is stably distributed to the center of the communication antenna 74 (specifically, the area surrounded by the coil of the communication antenna 74). Therefore, bias in the change of magnetic flux passing through the communication antenna 74 during reception is prevented, and the received radio waves are not affected by the electromagnetic induction of the transmitter-side magnet 72. In other words, since there is no bias in the radio waves caused by the magnetic flux of the transmitter-side magnet 72 distributed inside the coil forming the communication antenna 74, this embodiment does not adversely affect the sensitivity of the communication antenna 74.

[0048] As shown in FIG. 10, the second magnet portion 45 is provided in the second recess 25 and attracts the lower portion of the transmitter 80 inserted into the second recess 25. Specifically, the second magnet portion 45 is provided adjacent to the second power supply portion 35 on the back side of the bottom surface 33 of the second recess 25. The second magnet portion 45 is provided on both sides of the first magnet portion 42 as shown in FIG. 7. Specifically, the second magnet portion 45 is provided at a position symmetric with respect to the first magnet portion 42 when viewed from the first magnet portion 42. The second magnet portion 45 is larger than the second power supply portion 35 but smaller than the first magnet portion 42.

[0049] As shown in FIG. 10, a transmitter-side magnet 82 is provided at the lower portion of the transmitter 80. Specifically, the transmitter-side magnet 82 is provided on the back side of the lower end surface of the case of the transmitter 80. When the transmitter 80 is inserted into the second recess 25, the second magnet portion 45 faces the transmitter-side magnet 82 with the bottom surface 33 of the second recess 25 and the lower end surface of the transmitter 80 interposed therebetween. The polarity of the side of the transmitter-side magnet 82 facing the second magnet portion 45 is opposite to the polarity of the side of the second magnet portion 45 facing the transmitter-side magnet 82. Therefore, an attractive force is generated from the transmitter-side magnet 82 toward the second magnet portion 45, and the lower portion of the transmitter 80 is attracted toward the second magnet portion 45. At this time, the power supply-side terminal of the second power supply portion 35 contacts the charging terminal 83 of the transmitter 80.

[0050] <Modification Example> In the charging system S described above, a microphone 70 incorporating a first battery and a transmitter 80 incorporating a second battery are inserted into the left insertion recess 20A and the right insertion recess 20B of the charger 1, and the first battery and the second battery are charged. However, the present invention is not limited to this, and the first battery and the second battery may be charged by the charger 1 via a charging case described below.

[0051] FIG. 11 is a diagram showing a modification example of the charging system S. FIG. 12 is a diagram showing the charging case 90. FIG. 12(a) shows the charging case 90 with the first battery 77 of the microphone 70 mounted thereon, and FIG. 12(b) shows the charging case 90 with the second battery 87 of the transmitter 80 mounted thereon.

[0052] In the modified version, a charging case 90 equipped with the first battery 77 or the second battery 87 can be attached to the insertion recess 20 of the charger 1. In Figure 11, a charging case 90 with the first battery 77 attached is attached to the left insertion recess 20A.

[0053] The charging case 90 is a dedicated case for mounting the first battery 77 or the second battery 87. The charging case 90 has a first mounting section 91 into which the first battery 77 is mounted, and a second mounting section 92 into which the second battery 87 is mounted. Here, a part of the first mounting section 91 and a part of the second mounting section 92 overlap, which makes it possible to miniaturize the charging case 90. As a result, the first battery 77 and the second battery 87, which have significantly different shapes, can be mounted in the small charging case 90.

[0054] Furthermore, the charging case 90 has case terminals that connect to the terminals of the installed first battery 77 or the terminals of the second battery 87. In addition, a charging terminal is provided at the bottom of the charging case 90. This charging terminal is connected to the power supply side terminal of the power supply unit 30 (here, the left power supply unit 30A) when the charging case 90 is installed in the insertion recess 20 (here, the left insertion recess 20A). As a result, the power supply unit 30 can charge the first battery 77 or the second battery 87 installed in the charging case 90 via the charging terminal and the case terminal.

[0055] <Effects of this embodiment> The microphone 70 of the above-described embodiment has a coil-shaped communication antenna 74 for wireless communication, a transmitter-side magnet 72 provided at the lower part of the grip portion 71, and a magnet fixing portion 75 to which the transmitter-side magnet 72 is fixed. The communication antenna 74 surrounds the antenna shaft 76 inside the grip portion 71, and the magnet fixing portion 75 is provided at the tip of the antenna shaft 76 that is lower than the communication antenna 74. This configuration fixes the positional relationship between the communication antenna 74 and the transmitter-side magnet 72, eliminating fluctuations and biases in magnetic flux and suppressing a decrease in the communication quality of the communication antenna 74. As a result, the communication antenna 74 can communicate properly.

[0056] Although the present invention has been described above using embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes are possible within the scope of its gist. For example, all or part of the apparatus can be configured by functionally or physically distributing and integrating in any unit. Furthermore, new embodiments resulting from any combination of multiple embodiments are also included in the embodiments of the present invention. The effects of the new embodiments resulting from the combinations are combined with the effects of the original embodiments.

[0057] 1 Charger 70 Microphone 71 Grip 72 Transmitter-side magnet 73 Charging terminal 74 Communication antenna 75 Magnet fixing part 76 Antenna shaft

Claims

1. A microphone comprising: a grip portion provided with a charging terminal; a shaft member provided inside the grip portion along the longitudinal direction of the grip portion; a coil-shaped communication antenna for wireless communication, surrounding the shaft member inside the grip portion; a magnet portion provided at the lower part of the grip portion; and a magnet fixing portion provided at the lower end of the shaft member below the communication antenna, to which the magnet portion is fixed.

2. The microphone according to claim 1, wherein the shaft member is provided inside the grip portion from one end to the other in the longitudinal direction.

3. The microphone according to claim 1, wherein the communication antenna is in contact with the outer circumferential surface of the shaft member and is positioned relative to the shaft member.

4. The microphone according to claim 1, wherein the magnet fixing portion is provided between the communication antenna and the magnet portion.

5. The microphone according to claim 2, wherein the magnet portion is disc-shaped, and the magnet fixing portion is the end face of one end of the shaft member perpendicular to the longitudinal direction.

6. The microphone according to claim 1, wherein the magnet portion is sandwiched between the inner wall surface of the lower part of the grip portion and the magnet fixing portion.

7. The microphone according to claim 1, wherein the magnetic portion is attracted to the charger-side magnetic portion of the charger when the charging terminal contacts the power supply terminal of the charger.

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