Acoustic device

Abstract

This acoustic device is provided with: a first rotating body that can rotate about a first axis of rotation; a second rotating body that can rotate about the first axis of rotation independently of the first rotating body; an imparting unit that is provided to the first rotating body and is pressed against the second rotating body to impart a frictional force thereto; and a regulating unit that is provided to the first rotating body and regulates the frictional force applied by the imparting unit.

Description

sound equipment

[0001] The present disclosure relates to acoustic devices.

[0002] 2. Description of the Related Art There is known an audio device that includes a jog dial for controlling the playback of music. The jog dial has a first rotor that rotates around a rotation axis and a second rotor that rotates around a rotation axis.

[0003] The first rotating body has an annular portion formed in an annular shape centered on the rotation axis and is also called a platter, while the second rotating body has a disk portion provided inside the annular portion and formed in a disk shape centered on the rotation axis and is also called a vinyl.

[0004] During playback of music, a driving force is applied to the first rotating body, causing the first rotating body to rotate around the rotation axis. Frictional force is applied between the first rotating body and the second rotating body, causing the second rotating body to rotate integrally with the first rotating body.

[0005] An operator operating the audio device can rotate the second rotating body at a different speed and in a different direction than the first rotating body by touching the top surface of the second rotating body and applying a force exceeding the frictional force. The audio device plays music by adjusting the playback direction and playback speed of the music according to the rotation direction and rotation speed of the second rotating body.

[0006] Patent document 1 discloses an acoustic device that allows adjustment of the frictional force between a first rotating body and a second rotating body, thereby changing the force applied when rotating the second rotating body.

[0007] International Publication No. 2023 / 119669

[0008] In the acoustic device disclosed in Patent Document 1, the frictional force is adjusted by varying the thickness, material, number, etc. of the frictional force adjusting member sandwiched between the first rotating body and the second rotating body. Therefore, the second rotating body must be removed to adjust the frictional force, making the process cumbersome. Furthermore, the changed frictional force cannot be confirmed unless the second rotating body is installed. Furthermore, if the changed frictional force is not satisfactory, the second rotating body must be removed again and the frictional force changing member must be replaced, which increases the workload required to change the frictional force.

[0009] An object of the present disclosure is to provide an acoustic device that can easily change the frictional force between a first rotating body and a second rotating body.

[0010] The acoustic device according to the present disclosure comprises a first rotating body rotatable around a first rotation axis, a second rotating body rotatable around the first rotation axis independently of the first rotating body, an application unit provided on the first rotating body and pressed against the second rotating body to apply a frictional force, and an adjustment unit provided on the first rotating body to adjust the frictional force applied by the application unit.

[0011] According to the present disclosure, it is possible to obtain an acoustic device that can easily change the frictional force between the first rotating body and the second rotating body.

[0012] FIG. 1 is a plan view of an acoustic device according to a first embodiment. FIG. 2 is a perspective view of the second acoustic operation unit as viewed from above. FIG. 3 is a perspective view of the second acoustic operation unit as viewed from below. FIG. 4 is an exploded perspective view of the second acoustic operation unit. FIG. 5 is a perspective view of the base unit as viewed from above. FIG. 6 is a perspective view of the first rotating body as viewed from below. FIG. 7 is a perspective view of the first rotating body as viewed from below. FIG. 8 is a view of the second acoustic operation unit 4 cut along line VIII-VIII shown in FIG. 1 and viewed obliquely from above. FIG. 9 is a perspective view of the second rotating body as viewed from above. FIG. 10 is a view of the second rotating body as viewed from below. FIG. 11 is a partially enlarged view of a portion of the second acoustic operation unit where the applying unit and the adjusting unit are provided. FIG. 12 is a partially enlarged perspective view of a portion where the applying unit and the adjusting unit are provided as viewed from below. FIG. 13 is a partially enlarged perspective view of a portion where the applying unit and the adjusting unit are provided as viewed from below. FIG. 14 is a partially enlarged perspective view of a portion provided with an application portion and an adjustment portion, as viewed from below. FIG. 15 is a partially enlarged perspective view of a portion provided with an application portion and an adjustment portion, as viewed from below. FIG. 16 is a perspective view of a brake arm, as viewed from above. FIG. 17 is a perspective view of a brake lever, as viewed from below. FIG. 18 is a perspective view of a rotation operation portion. FIG. 19 is a view of the rotation operation portion, as viewed from below. FIG. 20 is a partially enlarged perspective view of an adjustment portion according to a first modified example. FIG. 21 is a partially enlarged perspective view of an adjustment portion according to a second modified example. FIG. 22 is a partially enlarged perspective view of a portion provided with an application portion and an adjustment portion according to the second modified example, as viewed from below. FIG. 23 is a partially enlarged perspective view of a portion provided with an application portion and an adjustment portion according to the second modified example, as viewed from below, with the brake arm removed. FIG. 24 is a partially enlarged view of an adjustment portion according to a third modified example, with the cover open. FIG. 25 is a partially enlarged view of an adjustment portion according to the third modified example, with the cover closed. Fig. 26 is a partially enlarged perspective view of the application unit and the adjustment unit according to the third modified example, as viewed from below. Fig. 27 is a partially enlarged perspective view of the application unit and the adjustment unit according to the third modified example, as viewed from below, showing a state in which the brake lever is removed. Fig. 28 is a partially enlarged view of the adjustment unit according to the fourth modified example, showing a state in which the cover is open.Fig. 29 is a partially enlarged view showing the adjustment unit according to the fourth modified example with the cover closed. Fig. 30 is a partially enlarged perspective view showing the application unit and the adjustment unit according to the third modified example as viewed from below.

[0013] An acoustic device according to an embodiment of the present disclosure will be described in detail below with reference to the drawings. However, the present disclosure is not limited to the embodiment described below.

[0014] [Embodiment 1] Fig. 1 is a plan view of an audio device according to embodiment 1. The audio device 1 includes a housing 2, a first audio operation unit 3 and a second audio operation unit 4 provided on a top surface 21 of the housing 2, and a control unit (not shown) provided inside the housing 2. The top surface 21 is formed on a top plate 22 of the housing 2. In the audio device 1, in response to operations on the first audio operation unit 3 and the second audio operation unit 4 performed by an operator, the control unit outputs an operation signal or outputs an audio signal of a song whose playback state has been adjusted. The operation signal and the audio signal are output to, for example, a music playback device (not shown) connected to the audio device 1. The music playback device plays music based on the input operation signal or audio signal.

[0015] A plurality of first acoustic operation units 3 are provided on the top surface 21 of the housing 2. The first acoustic operation units 3 include a button-type operation unit that is operated by pressing, and a slider-type operation unit that is operated by sliding.

[0016] The second acoustic operation unit 4 is provided on the top surface 21 of the housing 2. In the audio device 1, two second acoustic operation units 4 are provided side by side. Fig. 2 is a perspective view of the second acoustic operation unit as seen from above. Fig. 3 is a perspective view of the second acoustic operation unit as seen from below. Fig. 4 is an exploded perspective view of the second acoustic operation unit.

[0017] The second acoustic operation unit 4 includes a first rotating body 5, a second rotating body 6, an applying unit 8 (see FIG. 8 ), and an adjusting unit 9 (see FIG. 8 ), which are rotatable around a common first rotation axis 11. The second acoustic operation unit 4 also includes a base unit 7 that rotatably supports the first rotating body 5 and the second rotating body 6.

[0018] Here, the terms for directions used in the following description will be defined. First, the direction along the first rotation axis 11 when the first rotation axis 11 is parallel to the vertical direction is defined as the up-down direction. Furthermore, a Z axis parallel to the up-down direction is defined, with the positive direction along the Z axis being upward and the negative direction along the Z axis being downward. Furthermore, the circumferential direction refers to the circumferential direction of a circle centered on the first rotation axis 11. Furthermore, the radial direction refers to the radial direction of a circle centered on the first rotation axis 11. Note that the directions defined here are defined for convenience in explaining the present disclosure and do not specify the posture of the acoustic device 1 when in use.

[0019] <Base portion> Figure 5 is a perspective view of the base portion as viewed from above. The base portion 7 is fixed to the top surface 21 of the housing 2. The base portion 7 is formed in a circular shape when viewed in the up-down direction. A recess 71 that is recessed from top to bottom is formed in the base portion 7. A shaft portion 72 that extends along the first rotating shaft 11 is formed in the center of the recess 71. The shaft portion 72 is formed in a cylindrical shape. The first rotating body 5 and the second rotating body are rotatably fixed to the shaft portion 72.

[0020] The base portion 7 has a peripheral portion 73 formed around the recess 71, the peripheral portion 73 having an annular shape and an upper surface 73a facing upward.

[0021] <First Rotating Body> Figure 6 is a perspective view of the first rotating body as seen from above. The first rotating body 5 is formed in a circular shape when viewed in the up-down direction. A recess 51 that is recessed from top to bottom is formed in the first rotating body 5. An opening 51a that connects the inside and outside of the recess 51 is formed in the inner wall surface of the recess 51. An application portion 8 is provided outside the opening 51a. The configuration and function of the application portion 8 will be described in detail later. A protrusion 51b that protrudes inward is formed in the inner wall surface of the recess 51.

[0022] The first rotating body 5 is formed with a peripheral portion 52 having an upper surface 52a facing upward and formed in an annular shape surrounding the recessed portion 51. The first rotating body 5 is provided with an annular portion 53 formed in an annular shape surrounding the peripheral portion 52. As shown in FIG. 1 , the annular portion 53 is exposed on the top surface 21 side of the housing 2. The annular portion 53 is a part known as a platter, which rotates while the performance of a piece of music is being controlled. A through-hole 54 is formed in the center of the recessed portion 51, penetrating it vertically. The central axis of the through-hole 54 overlaps with the first rotating shaft 11.

[0023] Fig. 7 is a perspective view of the first rotating body as seen from below. Fig. 8 is a view of the second acoustic operation unit cut along line VIII-VIII shown in Fig. 1 as seen from diagonally above.

[0024] A cylindrical portion 55 is formed on the bottom surface of the first rotor 5, extending downward from the edge of the through-hole 54. Two bearings 56 are fitted inside the cylindrical portion 55. The bearings 56 are, for example, ball bearings, and have an outer ring 56a and an inner ring 56b.

[0025] An outer ring 56a of the bearing 56 is fixed to the inner wall surface of the cylindrical portion 55. An inner ring 56b of the bearing 56 is fixed to the shaft portion 72 of the base portion 7. This allows the first rotating body 5 to be rotatably supported on the base portion 7. The number of bearings 56 provided is not limited to two. Furthermore, the bearings 56 are not limited to ball bearings.

[0026] <Regarding the Drive Unit> The acoustic device 1 is provided with a drive unit 12 that rotates the first rotating body 5. As shown in Fig. 8 , the drive unit 12 is configured to have a plurality of coils 121 and a plurality of magnets 122. The plurality of coils 121 are provided on the bottom surface of the recess 71 of the base portion 7. The plurality of coils 121 are arranged in a circumferential direction so as to surround the periphery of the shaft portion 72. The plurality of magnets 122 are provided on the bottom surface of the recess 51 of the first rotating body 5. The plurality of magnets 122 are arranged in a circumferential direction so as to surround the periphery of the through hole 54. The drive unit 12 configured in this manner functions as an electric motor, and by passing current through the coils 121, the first rotating body 5 can be rotated together with the magnets 122 around the first rotating shaft 11.

[0027] <Second Rotating Body> As shown in FIGS. 4 and 8 , the second rotating body is provided inside the annular portion 53 of the first rotating body 5 .

[0028] 9 is a perspective view of the second rotating body 6 as seen from above. FIG. 10 is a perspective view of the second rotating body 6 as seen from below. The second rotating body 6 has a disk portion 61 and a cylindrical portion 62.

[0029] The disc portion 61 is a plate-like member formed in a circular shape centered on the first rotating shaft 11. The disc portion 61 is formed to a size that covers the upper surface 52a of the peripheral portion 52 provided on the first rotating body 5. The top surface of the disc portion 61 is exposed on the top surface side of the housing 2. The disc portion 61 is a part that rotates integrally with the first rotating body 5 while the performance of a piece of music is being controlled, and is what is known as a vinyl.

[0030] As shown in Figure 10, the cylindrical portion 62 is a cylindrical portion extending downward from the disk portion 61. A step portion 62a is provided in the cylindrical portion 62 so that the outer diameter at the bottom is larger than the outer diameter at the top (see also Figure 8). The step portion 62a engages with the protrusion 51b, which will be described later. The outer diameters of the upper and lower cylindrical portions do not need to be different as long as the shape allows engagement with the protrusion 51b. For example, a groove extending in the circumferential direction may be formed in the cylindrical portion 62, and the protrusion 51b may engage with the groove.

[0031] When the second rotating body 6 is provided inside the annular portion 53 of the first rotating body 5, the cylindrical portion 62 is inserted into the recessed portion 51 of the first rotating body 5. When the cylindrical portion 62 is inserted, the convex portion 51b provided on the inner wall surface of the recessed portion 51 of the first rotating body 5 engages from above with the stepped portion 62a of the cylindrical portion 62 of the second rotating body 6. This prevents the first rotating body 5 from falling off. Meanwhile, although the convex portion 51b engages with the stepped portion 62a from above, it does not engage with the cylindrical portion 62 in the circumferential direction, and therefore the second rotating body 6 is not prevented from rotating around the first rotating shaft 11.

[0032] A part of the outer surface of the cylindrical portion 62 serves as a contact surface 62b against which a part of the application portion 8 (described later) comes into contact. In the first embodiment, the entire circumferential area below the step portion 62a serves as the contact surface 62b, but the area above the step portion 62a may also serve as the contact surface 62b. Note that the portion where the step portion 62a is formed and the portion where the contact surface 62b is formed may be separate bodies as shown in FIG. 10 or may be integrated.

[0033] As shown in FIG. 8 , a frictional force imparting sheet 13 is sandwiched between the peripheral portion 52 of the first rotating body 5 and the disc portion 61. The frictional force imparting sheet 13 is formed of, for example, felt or resin. With the frictional force imparting sheet 13 sandwiched between the peripheral portion 52 of the first rotating body 5 and the disc portion 61, the rotational force imparted by the drive unit 12 is transmitted to the second rotating body 6 via the first rotating body 5. As a result, the second rotating body 6 rotates integrally with the first rotating body 5. On the other hand, by applying a force to the second rotating body 6 in the forward or reverse direction of rotation that exceeds the frictional force imparted by the frictional force imparting sheet 13, the second rotating body 6 can be rotated independently of the first rotating body 5. An operator can rotate the second rotating body 6 in a different direction or at a different speed than the first rotating body 5 by touching and applying a force to the disc portion 61 exposed from the top surface 21 of the housing 2.

[0034] The control unit transmits a signal to play the music in reverse or change the playback speed of the music according to the rotation direction and rotation speed of the second rotating body 6 that have changed as a result of the application of force. In the following description, applying force to the second rotating body 6 to change the rotation direction and rotation speed is also simply referred to as "scratching."

[0035] <Regarding the Display Unit> As shown in Figures 4 and 8, a space is formed inside the second rotating body 6, and the display unit 14 is provided in that space. The display unit 14 is installed with its display surface 14a, which can display various information, facing upward. The display unit 14 does not rotate because its rod-shaped portion 14b, which extends downward, is inserted into the inside of the shaft portion 72 of the base portion 7 and fixed therein. By forming part or all of the disc portion 61 of the second rotating body 6 from a translucent material, the various information displayed on the display surface 14a can be viewed by an operator or the like through the disc portion 61.

[0036] <Regarding the Applying Unit> As shown in FIG. 8 , the applying unit 8 is attached to the first rotating body 5. Therefore, the applying unit 8 rotates integrally with the first rotating body 5. The applying unit 8 is pressed against the second rotating body 6 to apply a frictional force, and the frictional force is adjustable. As described above, a frictional force is applied between the first rotating body 5 and the second rotating body 6 by the frictional force applying sheet 13 sandwiched between the peripheral portion 52 of the first rotating body 5 and the disc portion 61 of the second rotating body 6. In addition, by applying a frictional force to the second rotating body 6 by the applying unit 8 attached to the first rotating body 5, the force required to perform a scratch can be adjusted.

[0037] Fig. 11 is a partially enlarged view of a portion of the second acoustic operation unit where the applying unit and the adjusting unit are provided. Fig. 12 is a partially enlarged perspective view of the portion where the applying unit and the adjusting unit are provided, as viewed from below. Figs. 13 to 15 are partially enlarged perspective views of the portion where the applying unit and the adjusting unit are provided, as viewed from below.

[0038] The applying unit 8 includes a brake arm 81, a brake lever (moving unit) 82, and a spring 83. The brake arm 81 is attached to the first rotating body 5 so as to be rotatable around an arm-side fulcrum 81a. The brake arm 81 is provided so that one side surface faces the contacted surface 62b of the second rotating body 6. The side surface facing the contacted surface 62b of the second rotating body 6 forms a contact portion 81b that abuts against the contacted surface 62b. Felt, for example, is attached to the contact portion 81b. By rotating around the arm-side fulcrum 81a, the contact portion 81b of the brake arm 81 moves toward (indicated by arrow A2) or away from (indicated by arrow A3) the contacted surface 62b. By rotating in the direction indicated by arrow A2, the brake arm 81 enters the inside of the recess 51 through the opening 51a formed in the recess 51 of the first rotating body 5 and abuts the abutment portion 81b against the abutted surface 62b of the second rotating body 6.

[0039] A hook portion 81c is formed on the brake arm 81. A pulling portion 82f formed on the brake lever 82, which will be described later, hooks onto the hook portion 81c. Figure 16 is a perspective view of the brake arm as seen from above. A convex portion 81e that protrudes radially outward is formed on an outer surface 81d of the brake arm 81, which is the surface facing radially outward.

[0040] The brake lever 82 is attached to the first rotating body 5 so as to be rotatable around a lever-side fulcrum (moving-part-side fulcrum) 82a. The brake lever 82 is a moving part that moves toward (indicated by arrow A2) and away from (indicated by arrow A3) the abutment surface 62b, similar to the brake arm 81. This can be said as being movable between a position close to the first rotating shaft 11 and a position away from the first rotating shaft 11.

[0041] 17 is a perspective view of the brake lever as viewed from below. An inner surface 82c facing radially inward is formed on the lower surface 82b of the brake lever 82, facing opposite the outer surface 81d of the brake arm 81. A protrusion 82d protruding radially inward is formed on the inner surface 82c.

[0042] A pulling portion 82f that protrudes downward is formed on the underside 82b of the brake lever 82. When the brake lever 82 moves in the direction indicated by the arrow A3, the pulling portion 82f catches on the hook portion 81c of the brake arm 81, causing the brake arm 81 to move in the direction indicated by the arrow A3.

[0043] An upwardly protruding boss portion is formed on the upper surface 82e of the brake lever 82. The boss portion 82g is a portion that fits into a groove formed in a rotation operation portion, which will be described later.

[0044] The spring 83 is sandwiched and held between the outer surface 81d of the brake arm 81 and the outer surface of the brake lever 82. The spring 83 exerts a biasing force in a direction that moves the outer surface 81d of the brake arm 81 and the outer surface of the brake lever 82 away from each other. The spring 83 is, for example, a compression coil spring. A protrusion 81e formed on the brake arm 81 and a protrusion 82d formed on the brake lever 82 are inserted into the inside of the spring 83, which is a compression coil spring, thereby preventing the spring 83 from falling off.

[0045] Returning from FIG. 13 to FIG. 15, when the brake lever 82 moves in the direction indicated by the arrow A2, the biasing force of the spring 83 also applies a force to the brake arm 81 to move in the direction indicated by the arrow A2.

[0046] <Regarding the Adjustment Unit> As shown in Fig. 8 and Fig. 12 to Fig. 15 , the adjustment unit 9 has a rotation operation unit 91 attached to the first rotating body 5. The rotation operation unit 91 is attached to the first rotating body 5 so as to be rotatable around a second rotation axis 91a parallel to the first rotation axis 11. As shown in Fig. 11 , the rotation operation unit 91 is exposed on the top surface 21 side of the housing 2 from a notch 53a formed in the annular portion 53 of the first rotating body 5. Therefore, the operator can rotate the rotation operation unit 91 by touching the exposed portion of the rotation operation unit 91.

[0047] Fig. 18 is a perspective view of the rotary operation unit. Fig. 19 is a view of the rotary operation unit as seen from below. As shown in Figs. 18 and 19, a groove 91b extending in a spiral shape centered on the second rotation shaft 91a is formed in the rotary operation unit 91. A boss portion 82g formed on the brake lever 82 fits into the groove 91b.

[0048] Since the groove 91b extends in a spiral shape, the distance from the second rotary shaft 91a varies depending on the position of the groove 91b. More specifically, the distance D2 is greater than the distance D1 shown in FIG.

[0049] Returning to FIG. 15 from FIG. 13 , when the rotary operation unit 91 is rotated, the position of the groove 91b into which the convex portion 82d of the brake lever 82 fits changes. In the rotated position of the rotary operation unit 91 shown in FIG. 13 , the distance between the groove 91b into which the convex portion 82d fits and the second rotary shaft 91a is small, and the brake lever 82 is positioned away from the first rotary shaft 11. At this time, the brake arm 81 is pulled by the pulling portion 82f hooked on the hook portion 81c and is positioned in the direction indicated by arrow A3. At this time, there is a gap between the abutting portion 81b of the brake arm 81 and the abutted surface 62b of the second rotary body 6. Therefore, in the state shown in FIG. 13 , the frictional force applied to the second rotary body 6 by the applying portion 8 is at its smallest.

[0050] In the rotation position of the rotation operation unit 91 shown in Figure 14, the distance between the groove 91b, into which the convex portion 82d is fitted, and the second rotation shaft 91a is greater than in the state shown in Figure 13, and the brake lever 82 is also moved in the direction indicated by arrow A2. When the brake lever 82 moves in the direction indicated by arrow A, the inner surface 82c of the brake lever 82 approaches the outer surface 81d of the brake arm 81 (see Figure 16). This compresses the spring 83 provided between the outer surface 81d and the inner surface 82c, and a biasing force is applied to the brake arm 81 to move it in the direction indicated by arrow A2. This applies a frictional force to the abutment surface 62b of the second rotating body 6, making the frictional force applied to the second rotating body 6 greater than in the state shown in Figure 13.

[0051] In the rotation position of the rotation operation unit 91 shown in FIG. 15 , the distance between the groove 91b into which the convex portion 82d is fitted and the second rotation shaft 91a is increased. As a result, the brake lever 82 is also moved in the direction indicated by arrow A2 and is at a position closest to the first rotation shaft 11. Therefore, the spring 83 is further compressed than in the state shown in FIG. 14 , and a greater biasing force is applied to the brake arm 81. Therefore, although the state in which the abutting portion 81b abuts against the abutted surface 62b of the second rotating body 6 remains unchanged, the biasing force applied by the spring 83 has increased, and a greater frictional force is applied to the second rotating body 6. In other words, in the state shown in FIG. 15 , the greatest frictional force is applied to the second rotating body 6.

[0052] The brake lever 82, on which the boss portion 82g is formed, is biased by the spring 83 in a direction that moves it radially outward. Therefore, the boss portion 82g abuts against an inner wall surface 91c, which is the wall surface of the groove 91b formed in the rotation operation unit 91 that is closer to the second rotation shaft 91a. Therefore, when the rotation operation unit 91 is rotated, the boss portion 82g is pushed by the inner wall surface 91c, and the brake lever 82 moves. In other words, the area of ​​the rotation operation unit 91 that is surrounded by the inner wall surface 91c functions as a cam that moves the boss portion 82g by rotating about the second rotation shaft 91a.

[0053] <Effects> As described above, the force required for the operator to scratch changes as the frictional force applied to the second rotating body 6 from the application unit 8, which rotates together with the first rotating body 5, changes. Therefore, by simply rotating the rotation operation unit 91, the operator can adjust the force required to scratch.

[0054] FIG. 20 is a partially enlarged perspective view showing the adjustment unit according to the first modified example. As shown in FIG. 20 , a recess 21a is formed on the top surface 21 of the top plate 22 of the housing 2 at the edge that contacts the first rotating body 5. In the first modified example, the rotation operation unit 91 is positioned so as to overlap the recess 21a in the vertical direction. Therefore, the rotation operation unit 91 is exposed and operable by the operator only when the rotation position of the first rotating body 5 is such that the rotation operation unit 91 and the recess 21a are aligned. Therefore, the rotation operation unit 91 cannot be touched at most rotation positions of the first rotating body 5. This prevents, for example, an operator from accidentally touching the rotation operation unit 91 and changing the frictional force applied to the second rotating body 6, thereby changing the force required to perform a scratch.

[0055] <Second Modification> Fig. 21 is a partially enlarged perspective view showing an adjustment unit according to a second modification. Fig. 22 is a partially enlarged perspective view showing a portion where the application unit and the adjustment unit according to the second modification are provided, as viewed from below.

[0056] In the second modified example, the rotation operation unit 91 is rotatable about a second rotation axis 91a parallel to the radial direction. The rotation operation unit 91 is also provided to pass through a through-hole 53b extending along the radial direction and formed in the annular portion 53 of the first rotor. By rotating the rotation operation unit 91 about the second rotation axis 91a, the rotation operation unit 91 moves between a position closer to the first rotation axis 11 (the direction indicated by arrow A4, a direction closer to the radial inside) and a position farther away from the first rotation axis 11 (the direction indicated by arrow A5, a direction closer to the radial outside). The rotation operation unit 91 can be rotated using a tool such as a screwdriver.

[0057] In the second modified example, similar to the example shown in Figures 11 to 15, the brake arm 81 is attached to the first rotating body so as to be rotatable around the arm-side fulcrum 81a. The second modified example differs from the example shown in Figures 11 to 15 in that the brake arm 81 is formed with a wall portion 81f extending upward. A notch 81g is formed on the upper edge of the wall portion 81f. As shown in Figure 22, the tip of the rotation operation unit 91 passes through the notch 81g formed in the wall portion 81f.

[0058] 23 is a partially enlarged perspective view of the portion of the second modified example in which the application portion and adjustment portion are provided, viewed from below, with the brake arm removed. As shown in FIG. 23 , a pull portion 91d having a larger diameter than the other portions is formed at the tip of the rotation operation portion 91. The pull portion 91d is formed to be large enough not to pass through the notch 81g formed in the wall portion 81f. Therefore, when the rotation operation portion 91 is rotated and moved in the direction indicated by arrow A5, the pull portion 91d catches on the wall portion 81f of the brake arm 81, moving the brake arm 81 in the direction indicated by arrow A5.

[0059] In the second modified example, the spring 83 exerts a biasing force that moves the wall portion 81f in the direction indicated by the arrow A4 and moves the rotation operation portion 91 in the direction indicated by the arrow A5. In the second modified example, the rotation operation portion 91 also functions as a moving portion that pushes in the brake arm 81 on which the wall portion 81f is formed.

[0060] Even in the second variant described above, by simply performing the simple operation of rotating the rotation operation unit 91, the operator can change the magnitude of the frictional force applied to the second rotating body and adjust the force required to perform the scratch.

[0061] <Third Modification> Fig. 24 is a partially enlarged view showing the adjustment unit according to the third modification with the cover open. Fig. 25 is a partially enlarged view showing the adjustment unit according to the third modification with the cover closed. Fig. 26 is a partially enlarged perspective view of the application unit and adjustment unit according to the third modification, as seen from below. Fig. 27 is a partially enlarged perspective view of the application unit and adjustment unit according to the third modification, as seen from below, with the brake lever removed.

[0062] As shown in Fig. 24, in the third modified example, a recess 53c is formed in the annular portion 53 of the first rotating body 5. As shown in Fig. 25, in the third modified example, a cover 57 is provided that opens and closes the recess 53c.

[0063] The rotary operation unit 91 is provided inside the recess 53c. The rotary operation unit 91 differs from the rotary operation unit 91 shown in the second modified example in that the portion exposed from the recess 53c is larger than that shown in the second modified example, and can be directly operated by the operator. In other respects, the rotary operation unit 91 is basically the same as that shown in the second modified example, such as being rotatable around a second rotation axis 91a extending in the radial direction.

[0064] Therefore, even in the second variant described above, by simply performing the simple operation of rotating the rotation operating unit 91, the operator can change the magnitude of the frictional force applied to the second rotating body and adjust the force required to perform the scratch.

[0065] In addition, by closing the cover 57, the rotation operation unit 91 is covered with the cover 57, preventing the operator from accidentally touching the rotation operation unit 91 and unintentionally changing the frictional force applied to the second rotating body 6.

[0066] <Fourth Modification> Fig. 28 is a partially enlarged view showing an adjustment unit according to a fourth modification with the cover open. Fig. 29 is a partially enlarged view showing an adjustment unit according to the fourth modification with the cover closed. Fig. 30 is a partially enlarged perspective view showing the application unit and adjustment unit according to a third modification from below.

[0067] In the fourth modified example, similarly to the third modified example, a recess 53c is formed in the annular portion 53 of the first rotor 5. In addition, as shown in Fig. 29, a cover 57 is provided to cover the recess 53c in an openable and closable manner.

[0068] The rotation operation unit 91 is provided inside the recess 53 c. The rotation operation unit 91 is attached to the first rotating body 5 so as to be rotatable around a second rotation axis 91 a that extends parallel to the tangent direction of a circle centered on the first rotation axis 11.

[0069] As shown in Figure 30, a worm gear 91e is formed on the rotation operation unit 91. In the fourth modified example, a moving unit 84 that moves parallel to the second rotation shaft 91a is provided. The moving unit 84 is included in the application unit 8. The moving unit 84 is formed with teeth 84a that mesh with the worm gear 91e. By rotating the rotation operation unit 91, the moving unit 84 moves in the direction indicated by arrow A6, which is a direction parallel to the second rotation shaft 91a, and in the direction indicated by arrow A7.

[0070] A force point 81h extending from the arm-side fulcrum 81a in a direction different from that of the contact portion 81b is formed on the brake arm 81. A wall portion 84b facing the force point 81h is formed on the moving portion 84.

[0071] The spring 83 is held between the force point 81h and the wall 84b and exerts a biasing force in a direction separating the force point 81h and the wall 84b. The moving portion 84 is formed with a tension portion 84c located on the opposite side of the wall 84b with the force point 81h in between. When the moving portion 84 moves in the direction indicated by arrow A6, the tension portion 84c comes into contact with the force point 81h and moves the abutment portion 81b of the brake arm 81 in a direction away from the abutted surface 62b.

[0072] Even in the fourth variant described above, by simply performing the simple operation of rotating the rotation operating unit 91, the operator can change the magnitude of the frictional force applied to the second rotating body 6 and adjust the force required to perform the scratch.

[0073] In addition, by closing the cover 57, the rotation operation unit 91 is covered with the cover 57, preventing the operator from accidentally touching the rotation operation unit 91 and unintentionally changing the frictional force applied to the second rotating body 6.

[0074] In addition, the configuration in which the moving part is moved by a worm gear formed on the rotary operating part 91 can also be applied to configurations using a rotary operating part that rotates around a rotation axis parallel to the radial direction, as in the second and third modified examples.

[0075] 1 Acoustic device, 2 Housing, 21 Top surface, 22 Top plate, 3 First acoustic operation unit, 4 Second acoustic operation unit, 5 First rotating body, 51 Recess, 51a Opening, 51b Convex portion, 52 Surrounding portion, 52a Top surface, 53 Annular portion, 53a Notch, 53b Through hole, 54 Through hole, 55 Cylindrical portion, 56 Bearing, 56a Outer ring, 56b Inner ring, 57 Cover, 6 Second rotating body, 61 Circumferential plate portion, 62 Cylindrical portion, 62a Step portion, 62b Contact surface, 7 Base portion, 71 Recess, 72 Shaft portion, 73 Surrounding portion, 73a Top surface, 8 Applying portion, 81 Brake arm, 81a Arm side fulcrum, 81b Contact portion, 81c Hook portion, 81d Outer surface, 81e Convex portion, 81f wall portion, 81g notch, 81h force point portion, 82 brake lever, 82a lever side fulcrum, 82b lower surface, 82c inner surface, 82d convex portion, 82e upper surface, 82f pulling portion, 82g boss portion, 83 spring, 84 moving portion, 84a tooth portion, 84b wall portion, 84c pulling portion, 9 adjustment portion, 91 rotation operation portion, 91a second rotating shaft, 91b groove, 91c inner wall surface, 91d pulling portion, 91e worm gear, 12 drive portion, 121 coil, 122 magnet, 13 frictional force imparting sheet, 14 display portion, 14a display surface

Claims

1. An acoustic device comprising: a first rotating body that is rotatable around a first rotation axis; a second rotating body that is rotatable around the first rotation axis independently of the first rotating body; an applying unit that is provided on the first rotating body and is pressed against the second rotating body to apply a frictional force; and an adjusting unit that is provided on the first rotating body and adjusts the frictional force applied by the applying unit.

2. The acoustic device described in claim 1, wherein the first rotating body has an annular portion formed in a ring shape centered on the first rotation axis, the second rotating body is provided inside the annular portion, the applying portion has a brake arm that rotates around an arm-side fulcrum and abuts against the second rotating body, and the adjusting portion adjusts the force with which the applying portion is pressed against the second rotating body.

3. The acoustic device described in claim 2, wherein the application section has: a moving section that is movable between a position close to the first rotation axis and a position away from the first rotation axis; and a biasing section that is provided between the moving section and the brake arm and that exerts a biasing force in a direction that increases the distance between the moving section and the brake arm.

4. The acoustic device described in claim 3, wherein the adjustment unit has a rotatable rotation operating unit, and the rotation operating unit moves the moving unit as it rotates, thereby varying the distance between the moving unit and the brake arm.

5. The acoustic device according to claim 4, wherein the rotary operation unit rotates about a second rotation axis parallel to the first rotation axis.

6. The acoustic device described in claim 4, wherein the moving part is capable of rotating around a moving part fulcrum to move between a position close to the brake arm and a position distant from the brake arm, and the rotation operation part is formed with a cam that abuts against the moving part depending on the rotation angle, thereby varying the distance between the brake arm and the moving part.

7. The acoustic device according to claim 4, wherein a portion of the rotary operation part is exposed from a side of the first rotary body.

8. The acoustic device according to claim 7, wherein the first rotating body is provided with a cover that can be opened and closed and covers the rotary operation unit.

9. An acoustic device as described in claim 6, further comprising a top plate that covers the periphery of the first rotating body and has a top surface perpendicular to the first rotation axis, wherein a recess is formed in a part of the edge of the top surface that contacts the first rotating body when viewed along the first rotation axis, and the position where the rotation operation unit is provided overlaps with the position of the recess in the direction along the first rotation axis.

10. The acoustic device according to claim 4, wherein the rotary operation unit rotates about a second rotation axis that is parallel to the radial direction of a circle centered on the first rotation axis.

11. The acoustic device according to claim 10, wherein the rotary operation unit moves between a position close to the first rotation axis and a position far from the first rotation axis in response to rotation.

12. The acoustic device according to claim 11, wherein the rotary operation unit functions as the moving unit.

13. The acoustic device according to claim 10, wherein a worm gear is formed on the rotary operation part, and a toothed part that meshes with the worm gear is formed on the moving part.

14. The acoustic device according to claim 4, wherein the rotary operation unit rotates about a second rotation axis that is parallel to the tangent direction of a circle centered on the first rotation axis.

15. An acoustic device as described in claim 14, wherein the brake arm has an abutment portion that extends from the arm-side fulcrum and abuts against the second rotating body, and a force point portion that extends from the arm-side fulcrum in a direction different from the abutment portion, and the biasing portion is provided between the moving portion and the force point portion.

16. The acoustic device according to claim 15, wherein a worm gear is formed on the rotary operation part, and teeth that mesh with the worm gear are formed on the moving part.

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