Sound outputting device

Abstract

A speaker unit including an annular magnet, a frame to which the magnet is attached, a coil to which a driving current is supplied, and a diaphragm to which the coil is attached is provided, in which the diaphragm includes a vibration portion that is vibrated integrally with the coil when outputting sound, and a bent portion that is continuous from an outer periphery of the vibration portion and is bent toward the magnet with respect to the vibration portion, and the bent portion is provided with a joint portion joined to an outer peripheral surface of the frame. Therefore, since the diaphragm is attached to the frame by joining the joint portion provided in the bent portion bent toward the magnet with respect to the vibration portion to the outer peripheral surface of the frame, it is possible to downsize while securing a stable attaching state of the diaphragm to the frame.

Description

TECHNICAL FIELD

[0001] The present technology relates to a technical field of a sound output device that outputs sound.BACKGROUND ART

[0002] There is a sound output device that is worn on a head such as an ear, is used as a headphone or an earphone, and outputs sound from a speaker unit; in recent years, an aspect in which a sound output device is used outdoors increases in addition to an aspect in which this is used indoors.

[0003] Such sound output device includes a so-called dynamic-type sound output device in which a speaker unit including a magnet, a coil, and a diaphragm is provided, and the diaphragm is vibrated by a magnetic circuit to output sound (refer to, for example, Patent Document 1, Patent Document 2, and Patent Document 3).

[0004] In the sound output device, an outer peripheral portion of the diaphragm is attached by a diaphragm ring to an outer peripheral portion of a member called a frame also functioning as a yoke to which a magnet is attached, and a stable attaching state of the diaphragm to the frame is secured. Since the stable attaching state of the diaphragm to the frame is secured, the diaphragm is vibrated in a stable state by a driving force of the magnetic circuit, and an excellent output state of sound is secured.CITATION LISTPATENT DOCUMENT

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2000-188797 Patent Document 2: Japanese Patent Application Laid-Open No. 2000-165991 Patent Document 3: Japanese Patent Application Laid-Open No. 58-71798 SUMMARY OF THE INVENTIONPROBLEMS TO BE SOLVED BY THE INVENTION

[0006] Meanwhile, the sound output device described above also includes a type being worn on the head, particularly on the ear to be used, and an aspect of being used outdoors is also increasing, and there is a high demand for downsizing in consideration of wearability to the ear, portability and the like.

[0007] In contrast, since the sound output device is mounted on the head, an outer shape of a portion in contact with the head is formed in a rounded shape, and it is desirable that a speaker unit having a maximum diameter is arranged in a limited space.

[0008] However, in a configuration in which a diaphragm is attached to a frame using a diaphragm ring, the sound output device tends to be large due to the presence of the diaphragm ring.

[0009] Therefore, an object of the sound output device of the present technology is to achieve downsizing while securing a stable attaching state of the diaphragm to the frame.SOLUTIONS TO PROBLEMS

[0010] A sound output device according to the present technology includes a speaker unit including an annular magnet, a frame to which the magnet is attached, a coil to which a driving current is supplied, and a diaphragm to which the coil is attached, in which the diaphragm includes a vibration portion that is vibrated integrally with the coil when outputting sound, and a bent portion that is continuous from an outer periphery of the vibration portion and is bent toward the magnet with respect to the vibration portion, and the bent portion is provided with a joint portion joined to an outer peripheral surface of the frame.

[0011] Therefore, the diaphragm is attached to the frame by joining the joint portion provided in the bent portion bent toward the magnet with respect to the vibration portion to the outer peripheral surface of the frame.BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 illustrates an embodiment of a sound output device of the present technology together with Figs. 2 to 14, and this drawing is a perspective view of a sound output device. Fig. 2 is an exploded perspective view of the sound output device. Fig. 3 is a perspective view of a first case. Fig. 4 is a cross-sectional view of the first case. Fig. 5 is a cross-sectional view illustrating a state in which a speaker unit is arranged in a unit arranging space of the first case. Fig. 6 is a cross-sectional view of the speaker unit. Fig. 7 is an enlarged cross-sectional view illustrating an attaching state of a diaphragm to a frame. Fig. 8 is an enlarged cross-sectional view illustrating a state in which an adhesive is applied to an outermost peripheral portion of the diaphragm. Fig. 9 is a perspective view illustrating an arranging state of a wiring board connected to a microphone with respect to the first case. Fig. 10 is a cross-sectional view illustrating the arranging state of the wiring board connected to the microphone with respect to the first case. Fig. 11 is a side view illustrating an arranging state of a lead-out wire led out from a coil. Fig. 12 illustrates an assembly procedure of a speaker unit together with Figs. 13 and 14, and is a cross-sectional view illustrating a state in which the coil is attached to the diaphragm. Fig. 13 is a cross-sectional view illustrating a state in which the diaphragm is assembled to the first case. Fig. 14 is a cross-sectional view illustrating a state in which the diaphragm is assembled to the frame. MODE FOR CARRYING OUT THE INVENTION

[0013] Hereinafter, a mode for implementing a sound output device of the present technology will be described with reference to the accompanying drawings. In the embodiment described below, the sound output device according to the present technology is applied to a headphone. Note that, an application range of the present technology is not limited to headphones, and the present technology can be widely applied to various other sound output devices such as earphones.

[0014] Note that, the sound output device described below is provided with a dynamic-type speaker unit functioning as a sound output unit, and the speaker unit includes annular coil and magnet. In the following description, when a direction is indicated, front-rear, up-down, and right-left directions are indicated assuming that an axial direction of the coil is a front-rear direction.

[0015] Note that, the front-rear, up-down, and right-left directions hereinafter described are for the sake of convenience in description, and the implementation of the present technology is not limited to these directions.<Configuration of Sound Output Device>

[0016] First, a configuration of a sound output device 1 is described (refer to Figs. 1 to 11).

[0017] The sound output devices 1 are used, for example, as a pair, one for the left ear and the other for the right ear. Note that, sound may be listened to using one sound output device 1.

[0018] The sound output device 1 includes a housing 2 provided as an outer casing and required portions arranged inside the housing 2 (refer to Figs. 1 and 2).

[0019] The housing 2 includes a first case 3 and a second case 4 coupled in the front-rear direction.

[0020] The first case 3 includes a concave case portion 5 opened rearward, a sound guiding cylindrical portion 6 protruding obliquely forward and sideward from the case portion 5, a protrusion for terminal 7 protruding upward from a rear end of the case portion 5, and an overhanging portion 8 overhanging sideward from the case portion 5, which are integrally formed. An entire outer surface of the case portion 5 is formed in a curved shape protruding outward. The case portion 5 is formed in a substantially circular shape as seen in the front-rear direction, and an internal space thereof is formed as a unit arranging space 5a.

[0021] The sound guiding cylindrical portion 6 is formed in a substantially cylindrical shape. A space inside the sound guiding cylindrical portion 6 is formed as a sound guiding space 6a and is communicated with the unit arranging space 5a of the case portion 5. The sound guiding cylindrical portion 6 is provided with a microphone arranging portion 6b in the sound guiding space 6a.

[0022] For example, three terminal arranging holes 7a are formed on the protrusion for terminal 7. A board for terminal not illustrated on which three connection terminals are mounted is arranged on a rear surface side of the protrusion for terminal 7, and connection terminals are inserted into the terminal arranging holes 7a, respectively. The connection terminals are, for example, a charging terminal, a communication terminal and the like.

[0023] The overhanging portion 8 is formed in a shallow concave shape opened rearward.

[0024] The case portion 5 includes a substantially annular peripheral surface portion 9 and a curved closing portion 10 continuous from a front end of the peripheral surface portion 9, and the sound guiding cylindrical portion 6 is continuous from the closing portion 10. The closing portion 10 is formed in a gradual substantially spherical shape protruding forward.

[0025] An annular pressing surface 9a facing rearward is formed in an inner peripheral portion of the peripheral surface portion 9 (refer to Figs. 3 and 4). On an inner peripheral surface of the peripheral surface portion 9, a front portion of the pressing surface 9a is formed as a first peripheral surface 9b, a rear portion of the pressing surface 9a is formed as a second peripheral surface 9c, and the second peripheral surface 9c is positioned on an outer peripheral side of the first peripheral surface 9b. The first peripheral surface 9b and the second peripheral surface 9c are gradually inclined so as to be displaced outward as going rearward.

[0026] On an inner surface side of the case portion 5, a holding groove 11 is formed in a portion ranging from the peripheral surface portion 9 to the closing portion 10, and the holding groove 11 is formed at a position from a part of the peripheral surface portion 9 through the closing portion 10 toward the sound guiding cylindrical portion 6. Therefore, the position at which the holding groove 11 is formed on the peripheral surface portion 9 is a non-forming portion 9d in which the pressing surface 9a, the first peripheral surface 9b, and the second peripheral surface 9c are not formed.

[0027] The second case 4 includes a recessed main body 12 opened on a side opposite to the first case 3 and a stem 13 protruding downward from the main body 12, which are integrally formed.

[0028] The main body 12 includes a first cover 14 formed in a laterally elongated shape and a second cover 15 positioned above the first cover 14. An opening of the main body 12 is provided as a circumferential coupling portion 16 having the same shape and same size as those of a rear end of the first case 3.

[0029] In the second case 4, a battery (battery) not illustrated is arranged inside the main body 12, and a microphone not illustrated functioning as a feedforward microphone is arranged inside the stem 13.

[0030] The housing 2 includes the case portion 5 of the first case 3 and the circumferential coupling portion 16 of the second case 4 abutted to be coupled (refer to Fig. 1).

[0031] A speaker unit 17 is arranged in the unit arranging space 5a of the first case 3 (refer to Fig. 5). The sound output from the speaker unit 17 is emitted outward through the sound guiding space 6a of the sound guiding cylindrical portion 6. The speaker unit 17 is a dynamic-type speaker unit, and includes a frame 18, a magnet 19, a flat yoke 20, a holding member 21, a diaphragm 22, and a coil 23 (refer to Figs. 5 and 6).

[0032] The frame 18 is formed by using a magnetic metal material, and includes a base plate 24 formed in an annular shape facing in the front-rear direction, an annular connecting portion 25 protruding forward from an outer peripheral portion of the base plate 24, a flange 26 protruding outward from a front end of the connecting portion 25, and a vertical wall 27 protruding forward from a position close to an outer periphery of the flange 26, which are integrally formed.

[0033] In an outer peripheral portion of the flange 26, a surface facing forward is formed on an outer peripheral side of the vertical wall 27, and this surface is formed as a receiving surface 26a. A lead-out hole 26b is formed in the outer peripheral portion of the flange 26. An outer peripheral surface 26c of the flange 26 is inclined so as to be gradually displaced outward as going rearward.

[0034] An outer peripheral surface of the vertical wall 27 is formed as an inclined surface 27a that is gradually inclined so as to be displaced outward as going rearward.

[0035] The magnet 19 and the flat yoke 20 are both formed in an annular shape and coupled in the front-rear direction. The flat yoke 20 is attached to a front surface of the magnet 19, and a rear surface of the magnet 19 is attached to a front surface of the base plate 24 in the frame 18.

[0036] The holding member 21 is formed in a substantially cylindrical shape by using a magnetic metal material, in which a front end is fixed to the flat yoke 20 and a rear end is fixed to the base plate 24 in a state of being inserted through the base plate 24 of the frame 18, the magnet 19, and the flat yoke 20. Therefore, in the speaker unit 17, the frame 18, the magnet 19, and the flat yoke 20 are coupled to be held by the holding member 21 in a state of being in close contact with one another in the front-rear direction.

[0037] In a state in which the frame 18, the magnet 19, and the flat yoke 20 are coupled, a gap 28 is formed as a predetermined space between an inner peripheral surface of the connecting portion 25 in the frame 18 and outer peripheral surfaces of the magnet 19 and the flat yoke 20.

[0038] The diaphragm 22 includes a vibration portion 29 vibrated when outputting sound and a bent portion 30 bent toward the magnet 19 with respect to the vibration portion 29.

[0039] The vibration portion 29 includes a dome 31 formed in a substantially spherical shape protruding forward and an annular outer peripheral portion 32 continuous from an outer peripheral edge of the dome 31.

[0040] The bent portion 30 includes a continuous portion 33 continuous from an outer peripheral edge of the outer peripheral portion 32 and a joint portion 34 continuous from the continuous portion 33. The joint portion 34 includes a step portion 34a bent outward at a substantially right angle to the continuous portion 33 and an outermost peripheral portion 34b bent inward at a substantially right angle to the step portion 34a. The continuous portion 33 is gradually inclined so as to be displaced outward as going rearward, and the outermost peripheral portion 34b is also gradually inclined so as to be displaced outward as going rearward.

[0041] The coil 23 includes a front end fixed to a rear surface of a boundary 29a between the dome 31 and the outer peripheral portion 32 of the vibration portion 29 by adhesion and the like, and is positioned in the gap 28 at least partially.

[0042] In the diaphragm 22, for example, the step portion 34a is attached to the receiving surface 26a of the frame 18 by an adhesive 100 (refer to Fig. 7). At that time, the step portion 34a is pressed from a front side by the pressing surface 9a of the first case 3 and is pressed against the receiving surface 26a to be joined.

[0043] Furthermore, at least a part of the outermost peripheral portion 34b is joined to an outer peripheral surface of the frame 18. At that time, at least a part of the outermost peripheral portion 34b may be interposed between the outer peripheral surface of the frame 18 and the inner peripheral surface of the peripheral surface portion 9 in the first case 3. Note that, at least a part of the outermost peripheral portion 34b may be adhered to the outer peripheral surface of the frame 18.

[0044] As described above, in the sound output device 1, the pressing surface 9a is formed on the first case 3, the receiving surface 26a is formed on the frame 18, the step portion 34a is provided on the joint portion 34 of the diaphragm 22, and the step portion 34a is pressed by the pressing surface 9a and pressed against the receiving surface 26a.

[0045] Therefore, since the joint portion 34 is joined to the outer peripheral surface of the frame 18 in a state in which the step portion 34a is pressed against the frame 18 by the first case 3, a stable fixed state of the bent portion 30 with respect to the frame 18 can be secured.

[0046] Furthermore, since the step portion 34a is adhered to the receiving surface 26a, the step portion 34a is adhered to the receiving surface 26a in a state in which the step portion 34a is pressed against the frame 18 by the first case 3, and a stable and strong fixed state of the diaphragm 22 to the frame 18 can be secured.

[0047] Note that, in the outermost peripheral portion 34b, the outer peripheral surface 26c of the flange 26 of the frame 18 and the second peripheral surface 9c of the peripheral surface portion 9 of the first case 3 are positioned in a state of facing each other on both sides in a thickness direction, and the adhesive 100 may be applied to a distal end of the outermost peripheral portion 34b instead of the adhesion of the step portion 34a (refer to Fig. 8). By applying the adhesive 100 to the distal end of the outermost peripheral portion 34b, the applied adhesive 100 penetrates between the outermost peripheral portion 34b and the outer peripheral surface 26c of the frame 18 and also penetrates between the outermost peripheral portion 34b and the second peripheral surface 9c of the peripheral surface portion 9, and the outermost peripheral portion 34b is simultaneously adhered to both the frame 18 and the first case 3.

[0048] By applying the adhesive 100 to a region ranging from the outer peripheral surface of the frame 18 to the outermost peripheral portion 34b and the inner peripheral surface of the peripheral surface portion 9, a fixing work of the joint portion 34 to the frame 18 and a fixing work of the joint portion 34 to the first case 3 are simultaneously performed, and workability can be improved.

[0049] Note that, in the sound output device 1, in a state in which the adhesive 100 is applied between the step portion 34a and the receiving surface 26a, the adhesive 100 may be applied to a region ranging from the outer peripheral surface 26c of the frame 18 to the outermost peripheral portion 34b and the second peripheral surface 9c of the peripheral surface portion 9.

[0050] Furthermore, in the sound output device 1, it is possible that the step portion 34a is not formed in the bent portion 30, and any portion of the bent portion 30 is joined to the outer peripheral surface 26c of the frame 18.

[0051] A microphone 35 is attached to be arranged in the microphone arranging portion 6b of the first case 3 (refer to Fig. 2). The microphone 35 is a microphone functioning as a feedback microphone for executing a noise canceling function together with the microphone functioning as the feedforward microphone described above.

[0052] The microphone 35 is mounted on one end in a longitudinal direction of a wiring board 36, and a first reinforcing plate 37 is attached to one end of the wiring board 36 on an opposite side of the microphone 35. A flexible printed wiring board is used as the wiring board 36. The wiring board 36 is reinforced by the first reinforcing plate 37, and a stable mounting state of the microphone 35 on the wiring board 36 is maintained.

[0053] The wiring board 36 is held in a state in which a portion excluding both ends in the longitudinal direction is inserted into the holding groove 11 formed on the first case 3 (refer to Figs. 9 and 10). The wiring board 36 is inserted into the holding groove 11 to be held, so that this is positioned over the dome 31 and the outer peripheral portion 32 of the diaphragm 22.

[0054] A second reinforcing plate 38 is attached to a part of the wiring board 36. The second reinforcing plate 38 is attached to a surface on the same side as a surface to which the first reinforcing plate 37 is attached in a thickness direction of the wiring board 36. That is, the second reinforcing plate 38 is attached to the surface on a side facing the surface of the vibration portion 29 of the wiring board 36.

[0055] The second reinforcing plate 38 is arranged in the non-forming portion 9d of the peripheral surface portion 9 in the holding groove 11. By arranging the second reinforcing plate 38 in the non-forming portion 9d, a rear surface of the second reinforcing plate 38 is positioned on substantially the same plane as the pressing surface 9a of the peripheral surface portion 9, and the rear surface of the second reinforcing plate 38 has the function similar to that of the pressing surface 9a.

[0056] Therefore, the step portion 34a of the diaphragm 22 is pressed against the receiving surface 26a in a state of being pressed by the pressing surface 9a and the second reinforcing plate 38.

[0057] As described above, in the sound output device 1, the wiring board 36, which is the flexible printed wiring board, is connected to the microphone 35, the holding groove 11 is formed in the first case 3 at a position facing the surface of the vibration portion 29, and the wiring board 36 is held in a state of being inserted into the holding groove 11.

[0058] Therefore, since the wiring board 36 is held in a state of being inserted into the holding groove 11 positioned to face the surface of the vibration portion 29, it is possible to secure an excellent holding state of the wiring board 36 while securing downsizing of the sound output device 1.

[0059] Furthermore, the second reinforcing plate 38 is attached to a surface of the wiring board 36 on a side facing the surface of the vibration portion 29, and a part of the second reinforcing plate 38 is positioned side by side with the pressing surface 9a between the bent portion 30 and the first case 3.

[0060] Therefore, since a part of the second reinforcing plate 38 is positioned side by side with the pressing surface 9a in a state in which the wiring board 36 is inserted into the holding groove 11, a part of the second reinforcing plate 38 can function as the pressing surface 9a, and an excellent sealed state between the diaphragm 22 and the first case 3 can be secured.

[0061] Furthermore, since the second reinforcing plate 38 is attached to the surface on the same side as the surface to which the first reinforcing plate 37 is attached in the thickness direction of the wiring board 36, an attaching work of the first reinforcing plate 37 and the second reinforcing plate 38 to the wiring board 36 is easy, and an excellent sealed state between the diaphragm 22 and the first case 3 can be secured while improving workability.

[0062] As described above, the coil 23 is positioned in the gap 28 at least partially in a state of being attached to the diaphragm 22. A lead-out wire 39 for supplying a current to the coil 23 is led out from the coil 23, and the lead-out wire 39 is connected to a power supply circuit not illustrated.

[0063] The lead-out wire 39 is positioned along an inner peripheral surface of the bent portion 30 in the diaphragm 22, then is bent in a curved shape and led out rearward. In the lead-out wire 39, a portion along the inner peripheral surface of the bent portion 30 is provided as a first portion 39a, a bent portion in a curved shape is provided as a second portion 39b, and a linear portion led out rearward from the diaphragm 22 is provided as a third portion 39c.

[0064] The third portion 39c of the lead-out wire 39 is inserted into the lead-out hole 26b formed in the flange 26 of the frame 18 to be led out rearward.

[0065] In this manner, in the sound output device 1, the lead-out wire 39 includes the first portion 39a positioned on an inner peripheral surface of the diaphragm 22 in a circumferential direction and the second portion 39b in a curved shape bent with respect to the first portion 39a, and is inserted into the lead-out hole 26b of the frame 18.

[0066] Therefore, since the first portion 39a is positioned along the inner peripheral surface of the speaker unit 17 and the second portion 39b is bent in a curved shape and inserted into the lead-out hole 26b to be led out, a load is hardly applied to the lead-out wire 39 at the time of vibration caused by the vibration portion 29 of the coil 23, and damage to the lead-out wire 39 can be prevented.

[0067] As described above, when the predetermined portions are arranged inside the first case 3 and the second case 4, the case portion 5 of the first case 3 and the main body 12 of the second case 4 are coupled, and an ear pad 50 is attached to the sound guiding cylindrical portion 6 to form the sound output device 1. By inserting the ear pad 50 into the ear canal, the sound output device 1 is worn on the ear. In a state in which the sound output device 1 is formed, the sound output from the speaker unit 17 is emitted to the outside from the sound guiding space 6a of the sound guiding cylindrical portion 6.<Assembly of Speaker Unit and First Case>

[0068] Hereinafter, an assembly procedure and the like between the speaker unit 17 and the first case 3 will be described (refer to Figs. 12 to 14).

[0069] The diaphragm 22 is formed in a predetermined shape by a molding mold not illustrated using a resin film, for example, polyethylene terephthalate and the like (refer to Fig. 12). At that time, as described above, the continuous portion 33 and the outermost peripheral portion 34b are gradually inclined so as to be displaced outward as going rearward.

[0070] The coil 23 is attached to the diaphragm 22. At that time, the coil 23 is positioned with respect to the bent portion 30 in which each portion is gradually inclined and attached to the diaphragm 22, high positioning accuracy of the coil 23 with respect to the diaphragm 22 is secured, and a central axis of the diaphragm 22 and a central axis of the coil 23 coincide with each other.

[0071] The diaphragm 22 is inserted into the first case 3 from behind with the coil 23 attached (refer to Fig. 13). At that time, since both the first peripheral surface 9b of the first case 3 and the continuous portion 33 of the diaphragm 22 are inclined so as to be gradually displaced outward as going rearward, the continuous portion 33 is guided by the first peripheral surface 9b, the diaphragm 22 is positioned with respect to the first case 3 with high accuracy, and the central axis of the peripheral surface portion 9 in the first case 3 and the central axis of the diaphragm 22 coincide with each other. Furthermore, since both the second peripheral surface 9c of the first case 3 and the outermost peripheral portion 34b of the diaphragm 22 are inclined so as to be gradually displaced outward as going rearward, the outermost peripheral portion 34b is guided by the second peripheral surface 9c, and excellent assemblability of the diaphragm 22 to the first case 3 is secured.

[0072] Subsequently, the frame 18 is inserted into the first case 3 from behind with the magnet 19 and the like attached (refer to Fig. 14). When the frame 18 is inserted into the first case 3 from behind, the flange 26 of the frame 18 is inserted inside the bent portion 30 in the diaphragm 22.

[0073] At that time, since the second peripheral surface 9c of the first case 3, the outermost peripheral portion 34b of the diaphragm 22, and the outer peripheral surface 26c of the flange 26 are all inclined so as to be gradually displaced outward as going rearward, the outer peripheral surface 26c is guided by the second peripheral surface 9c and the outermost peripheral portion 34b, the frame 18 is positioned with respect to the diaphragm 22 with high accuracy, and the central axis of the diaphragm 22 and the central axis of the frame 18 coincide with each other. In the frame 18, the outer peripheral surface 26c of the flange 26 faces or is in close contact with the outermost peripheral portion 34b of the diaphragm 22.

[0074] Note that, although the vertical wall 27 of the frame 18 is inserted inside the continuous portion 33 in the diaphragm 22, since the outer peripheral surface of the vertical wall 27 is formed as the inclined surface 27a, the vertical wall 27 does not interfere with the continuous portion 33, and the frame 18 is smoothly inserted into the first case 3.<Conclusion>

[0075] As described above, in the sound output device 1, the diaphragm 22 includes the vibration portion 29 that is vibrated integrally with the coil 23 when outputting sound, and the bent portion 30 that is continuous from the outer periphery of the vibration portion 29 and is bent toward the magnet 19 with respect to the vibration portion 29, and the joint portion 34 joined to the outer peripheral surface of the frame 18 is provided in the bent portion 30.

[0076] Therefore, since the diaphragm 22 is attached to the frame 18 by joining the joint portion 34 provided in the bent portion 30 bent toward the magnet 19 with respect to the vibration portion 29 to the outer peripheral surface of the frame 18, it is possible to downsize the sound output device 1 while securing a stable attaching state of the diaphragm 22 to the frame 18.

[0077] In particular, since the diaphragm 22 is attached to the frame 18 without using a diaphragm ring, it is possible to arrange the speaker unit 17 having a maximum diameter in a limited space, and it is possible to downsize the sound output device 1 while securing a maximum nominal diameter of the speaker unit 17.

[0078] Furthermore, it is also possible to improve wearability of the sound output device 1 on the ear, portability thereof and the like by downsizing the sound output device 1.<Present Technology>

[0079] The present technology can have the following configurations. (1) A sound output device including: a speaker unit including an annular magnet, a frame to which the magnet is attached, a coil to which a driving current is supplied, and a diaphragm to which the coil is attached, in which the diaphragm includes a vibration portion that is vibrated integrally with the coil when outputting sound, and a bent portion that is continuous from an outer periphery of the vibration portion and is bent toward the magnet with respect to the vibration portion, and the bent portion is provided with a joint portion joined to an outer peripheral surface of the frame. (2) The sound output device according to (1) described above, in which a housing that holds the speaker unit inside is provided, the housing includes a first case including a sound guiding space and a second case coupled to the first case, a pressing surface is formed on the first case, a receiving surface is formed on the frame, a step portion is provided on the joint portion, and the step portion is pressed by the pressing surface and pressed against the receiving surface. (3) The sound output device according to (2) described above, in which the step portion is adhered to the receiving surface. (4) The sound output device according to (1) or (2) described above, in which an outer peripheral surface of the frame and an inner peripheral surface of the first case are positioned on both sides of a distal end of the joint portion in a thickness direction in a state of facing each other, and an adhesive is applied to a region ranging from the outer peripheral surface of the frame to the distal end of the joint portion and the inner peripheral surface of the first case. (5) The sound output device according to any one of (1) to (3) described above, in which a microphone is arranged inside the first case, a wiring board, which is a flexible printed wiring board, is connected to the microphone, a holding groove is formed at a position facing a surface of the vibration portion in the first case, and the wiring board is held in a state of being inserted in the holding groove. (6) The sound output device according to (1) described above, in which a pressing surface is formed on the first case, the bent portion is provided with a step portion continuous from the joint portion and pressed by the pressing surface, a reinforcing plate is attached to a surface of the wiring board on a side facing a surface of the vibration portion, and a predetermined surface of the reinforcing plate is positioned side by side with the pressing surface between the bent portion and the first case. (7) The sound output device according to any one of (1) to (3) described above, in which the coil is connected to a power supply circuit by a lead-out wire, a lead-out hole is formed in an outer peripheral portion of the frame, the lead-out wire includes a first portion positioned on an inner peripheral surface of the diaphragm in a circumferential direction and a curved second portion bent with respect to the first portion, and the coil is inserted into the lead-out hole. REFERENCE SIGNS LIST

[0080] 1Sound output device 2Housing 3First case 4Second case 6aSound guiding space 9aPressing surface 11Holding groove 17Speaker unit 18Frame 19Magnet 22Diaphragm 23Coil 26cOuter peripheral surface 26aReceiving surface 26bLead-out hole 29Vibration portion 30Bent portion 34Joint portion 34aStep portion 34bOutermost peripheral portion 35Microphone 36Wiring board 38Second reinforcing plate 39Lead-out wire 39aFirst portion 39bSecond portion 100Adhesive

Claims

1. A sound output device comprising: a speaker unit including an annular magnet, a frame to which the magnet is attached, a coil to which a driving current is supplied, and a diaphragm to which the coil is attached, wherein the diaphragm includes a vibration portion that is vibrated integrally with the coil when outputting sound, and a bent portion that is continuous from an outer periphery of the vibration portion and is bent toward the magnet with respect to the vibration portion, and the bent portion is provided with a joint portion joined to an outer peripheral surface of the frame.

2. The sound output device according to claim 1, wherein a housing that holds the speaker unit inside is provided, the housing includes a first case including a sound guiding space and a second case coupled to the first case, a pressing surface is formed on the first case, a receiving surface is formed on the frame, a step portion is provided on the joint portion, and the step portion is pressed by the pressing surface and pressed against the receiving surface.

3. The sound output device according to claim 2, wherein the step portion is adhered to the receiving surface.

4. The sound output device according to claim 1, wherein a housing that holds the speaker unit inside is provided, the housing includes a first case including a sound guiding space and a second case coupled to the first case, an outer peripheral surface of the frame and an inner peripheral surface of the first case are positioned on both sides of a distal end of the joint portion in a thickness direction in a state of facing each other, and an adhesive is applied to a region ranging from the outer peripheral surface of the frame to the distal end of the joint portion and the inner peripheral surface of the first case.

5. The sound output device according to claim 1, wherein a housing that holds the speaker unit inside is provided, the housing includes a first case including a sound guiding space and a second case coupled to the first case, a microphone is arranged inside the first case, a wiring board, which is a flexible printed wiring board, is connected to the microphone, a holding groove is formed at a position facing a surface of the vibration portion in the first case, and the wiring board is held in a state of being inserted in the holding groove.

6. The sound output device according to claim 5, wherein a pressing surface is formed on the first case, the bent portion is provided with a step portion continuous from the joint portion and pressed by the pressing surface, a reinforcing plate is attached to a surface of the wiring board on a side facing a surface of the vibration portion, and a predetermined surface of the reinforcing plate is positioned side by side with the pressing surface between the bent portion and the first case.

7. The sound output device according to claim 1, wherein the coil is connected to a power supply circuit by a lead-out wire, a lead-out hole is formed in an outer peripheral portion of the frame, the lead-out wire includes a first portion positioned on an inner peripheral surface of the diaphragm in a circumferential direction and a curved second portion bent with respect to the first portion, and the coil is inserted into the lead-out hole.

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