JP7122602B2 - Speakers, electronics and mobile devices - Google Patents

Description

The present disclosure relates to a speaker having a flat diaphragm, an electronic device equipped with the speaker, and a mobile device equipped with the speaker.

Patent Document 1 discloses a loudspeaker with a planar diaphragm.

WO2016/002231

However, the technique of Patent Literature 1 has a problem that a peak dip occurs in the sound pressure frequency characteristics, and good sound pressure frequency characteristics cannot be obtained.

The present disclosure provides a loudspeaker having a flat plate-shaped diaphragm that can improve sound pressure frequency characteristics.

A speaker according to the present disclosure includes a diaphragm having at least one flat surface, a magnetic circuit having a magnetic gap, one end disposed in the magnetic gap of the magnetic circuit, and the other end fixed to the diaphragm. a voice coil body; a cylindrical support member that supports the diaphragm; An annular first connecting member having a shape that rolls so as to protrude to one side; and an annular second connecting member having a shape that is rolled so as to connect and protrude to the other side, wherein the magnetic circuit is disposed inside the second connecting member and the diaphragm is flat. When viewed, the speaker is such that the weight of the first portion of the diaphragm inside the voice coil body is increased.

It should be noted that these general or specific aspects may be realized by a system, method, integrated circuit, computer program, or a recording medium such as a computer-readable CD-ROM. and any combination of recording media.

A speaker according to the present disclosure can improve sound pressure frequency characteristics in a speaker including a flat diaphragm.

FIG. 1 is an external perspective view of a speaker according to Embodiment 1. FIG. FIG. 2 is a plan view of the speaker viewed from the front. FIG. 3 is a cross-sectional view of the loudspeaker in FIG. 2 taken along line III-III. 4 is an enlarged view of the vicinity of the magnetic gap in the speaker in FIG. 3. FIG. FIG. 5 is a plan view of the speaker viewed from the rear. FIG. 6 is an enlarged view of the cross section of the diaphragm. FIG. 7 is a plan view of the diaphragm and voice coil body as seen from the rear. 8 is a diagram showing a vibration model of the diaphragm according to Embodiment 1. FIG. FIG. 9 is a diagram showing vibration modes in a diaphragm without weight and a diaphragm with weight. FIG. 10 is a diagram showing sound pressure frequency characteristics of a speaker using a weightless diaphragm and a speaker using a weightless diaphragm. FIG. 11 is a conceptual diagram of a mobile device equipped with a speaker according to Embodiment 2. FIG.

(Knowledge on which the present invention is based)
Various types of loudspeakers are required depending on the application. For example, in-vehicle speakers are installed in narrow spaces such as dashboards, doors, and ceilings of vehicles. Therefore, it is required to make the in-vehicle speakers installed in such places thinner. Therefore, there is a need to use a speaker having a configuration in which the diaphragm is provided with a planar diaphragm as in Patent Document 1.

The inventors of the present invention have found that the speaker described in the "Background Art" section has the following problems.

It is difficult to obtain good sound pressure frequency characteristics in the conventional speaker having the planar diaphragm described in Patent Document 1. Specifically, in the speaker configured as in Patent Document 1, as shown in FIG. A split resonance is generated in which the first region in the vicinity and the second region on the outer peripheral side of the first region vibrate separately. As a result, the conventional speaker has a problem that a large peak-dip occurs in the sound pressure frequency characteristic, as shown in the graph of "no weight" in FIG. FIG. 8 is a diagram showing vibration modes of the speaker. FIG. 9 is a diagram showing sound pressure frequency characteristics of a speaker.

In order to solve the above problems, the inventors of the present invention have found the following loudspeaker after earnest investigation.

A speaker according to an aspect of the present invention includes a diaphragm having at least one flat surface, a magnetic circuit having a magnetic gap, one end disposed in the magnetic gap of the magnetic circuit, and the other end being the diaphragm. a cylindrical support member that supports the diaphragm; and a cylindrical support member that supports the diaphragm, and is disposed on one side of the diaphragm so as to and an annular first connecting member having a rolled shape so as to connect and protrude to the one side; a ring-shaped second connection member having a shape that is rolled so as to connect the peripheral portion and protrude to the other side, wherein the magnetic circuit is disposed inside the second connection member, and the In the speaker, when the diaphragm is viewed from above, the weight of the first portion inside the voice coil body of the diaphragm is increased.

Therefore, in the inner region inside the position of the node of the primary resonance mode of the speaker, there is a vibration deviation between the first region near the center of the inner region and the second region on the outer peripheral side of the first region. can be generated and the vibration of the diaphragm as a whole can be canceled. As a result, the primary resonance mode of the diaphragm can be suppressed, and the sound pressure frequency characteristics of the speaker can be improved.

Further, when the diaphragm is viewed from above, the weight of the first portion inside the voice coil body of the diaphragm may be greater than the weight of the second portion outside the voice coil body.

Further, when the diaphragm is viewed from above, the weight per unit area of the first portion may be larger than the weight per unit area of the second portion outside the voice coil body.

Further, the diaphragm may have a flat plate-shaped diaphragm body and a weight arranged in an inner portion of the diaphragm body inside the voice coil body.

Therefore, by arranging the weight in the inner portion of the diaphragm body, the weight of the first portion of the diaphragm can be easily made larger than the weight of the second portion.

Further, the weight may be arranged on a surface of the diaphragm main body to which the voice coil body is fixed.

Therefore, the weight can be arranged at a position that is difficult to see from the outside, and the appearance of the speaker can be improved.

Further, the weight may be fixed to the inner peripheral surface of the voice coil body.

According to this, the weight is fixed to the diaphragm and the voice coil body. Therefore, the diaphragm and the voice coil body can be firmly fixed.

Also, the weight may have an opening.

Therefore, the weight of the weight can be easily adjusted by adjusting the size of the opening.

Further, the weight may be arranged at a position where the center of gravity of the weight does not overlap the center of gravity of the diaphragm main body.

Therefore, the diaphragm can be vibrated in a wide frequency band, and the sound pressure frequency characteristics of the speaker can be improved.

Further, the weight may be made of foamed resin.

Therefore, it is possible to easily process the weight. Also, the weight can be easily fixed to the diaphragm.

An electronic device according to an aspect of the present invention includes the speaker described above and a circuit section that inputs an electric signal to the speaker.

A mobile device according to an aspect of the present invention includes the speaker, a circuit unit for inputting an electric signal to the speaker, and a self-propellable main body on which the speaker and the circuit unit are mounted.

Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of well-known matters and redundant descriptions of substantially the same configurations may be omitted. This is to avoid unnecessary verbosity in the following description and to facilitate understanding by those skilled in the art.

It is noted that the inventor(s) provide the accompanying drawings and the following description in order for those skilled in the art to fully understand the present disclosure, which are intended to limit the claimed subject matter. not something to do.

(Embodiment 1)
The configuration of the speaker according to the first embodiment will be described below with reference to FIGS. 1 to 7. FIG.

[1. Constitution]
FIG. 1 is an external perspective view of a speaker according to Embodiment 1. FIG. FIG. 2 is a plan view of the speaker viewed from the front. FIG. 3 is a cross-sectional view of the loudspeaker in FIG. 2 taken along line III-III. 4 is an enlarged view of the vicinity of the magnetic gap in the speaker in FIG. 3. FIG. FIG. 5 is a plan view of the speaker viewed from the rear.

As shown in FIGS. 1 to 5, the speaker 100 includes a diaphragm 10, a magnetic circuit 20, a voice coil body 30, a support member 40, and connection members 51 and 52. FIG. In the speaker 100, the direction in which sound is emitted from the speaker 100 is defined as the front, and the opposite direction is defined as the rear.

Diaphragm 10 has a circular outer shape and a plate-like shape. A detailed configuration of the diaphragm 10 will be described later.

The magnetic circuit 20 is arranged on and supported by the support member 40 , for example, fixed to the support member 40 . At least a portion of the magnetic circuit 20 is arranged inside the annular connecting member 52 . The magnetic circuit 20 includes, for example, a permanent magnet 21 as a magnet, and a bottom plate 22 , a yoke 23 and a top plate 24 as magnetic bodies surrounding the permanent magnet 21 . Thus, in the magnetic circuit 20, a circuit is formed in which the magnetic flux from the permanent magnet 21 loops through the magnetic bodies 22-24. The magnetic circuit 20 also has a magnetic gap 25 between the yoke 23 and the top plate 24 . The magnetic gap 25 is a space in which the magnetic flux generated by the permanent magnet 21 exists, and may be anywhere on the circuit where the magnetic flux flow loops, and is not necessarily limited to being arranged between the yoke 23 and the top plate 24. .

The voice coil body 30 has a voice coil 31 and a tubular (cylindrical) bobbin 32 . The voice coil 31 is a coil-shaped member configured by winding a metal wire around the outer peripheral surface of the bobbin 32 multiple times in an annular (cylindrical) shape. In the present embodiment, the voice coil 31 is fixed to the end of the outer peripheral surface of the bobbin 32 opposite to the side fixed to the diaphragm 10, that is, to the end on the side where the magnetic circuit 20 is arranged. ing. The voice coil 31 is electrically connected via a relay line 63 to input terminals 61 and 62 to which electrical signals are input. The input terminals 61 and 62 are provided, for example, through the side surfaces of the support member 40 and protruding outside the support member 40 .

One end of the voice coil body 30 where the voice coil 31 is arranged is arranged in the magnetic gap 25 of the magnetic circuit 20 , and the other end is fixed to the diaphragm 10 . The voice coil 31 is thereby positioned within the magnetic gap 25 . The voice coil 31 may, for example, be arranged entirely in the magnetic gap 25 . Further, as a result, the end portion of the bobbin 32 opposite to the side where the voice coil 31 is arranged is fixed to a portion inside the outer peripheral edge of the diaphragm 10 .

Note that the voice coil body 30 may be configured without the bobbin 32 , that is, configured to include only the voice coil 31 . In this configuration, part of the voice coil 31 is located within the magnetic gap 25 .

The support member 40 is a cylindrical member and supports the diaphragm 10 . For example, the supporting member 40 supports the diaphragm 10 by connecting the outer peripheral portion of the front side of the diaphragm 10 to the inner peripheral portion of the front end portion of the supporting member 40 via an annular connecting member 51 . do. In addition, for example, the support member 40 is connected to the inner peripheral portion of the support member 40 at a position rearward from the front end of the support member 40, and the outer peripheral portion of the rear surface side of the diaphragm 10 is connected via an annular connecting member 52. The diaphragm 10 is supported by . Support member 40 accommodates magnetic circuit 20 and voice coil body 30 therein. Further, the support member 40 supports the magnetic circuit 20 by being connected to the bottom plate 22, as shown in FIG. The support member 40 is made of metal, resin, or the like, for example.

The connecting member 51 is arranged on the front side of the diaphragm 10 and connects the outer peripheral portion of the diaphragm 10 and the inner peripheral portion of the support member 40 . Specifically, the inner peripheral portion of the connecting member 51 is fixed to the front surface of the outer peripheral portion of the diaphragm 10 , and the outer peripheral portion of the connecting member 51 is fixed to the inner peripheral portion of the support member 40 . Thereby, the connection member 51 connects the support member 40 and the diaphragm 10 . Moreover, the connecting member 51 has a rolled shape so as to protrude forward of the speaker 100 . The rolling shape of the connection member 51 may be provided over the entire circumference of the ring.

The connection member 52 is arranged on the rear side of the diaphragm 10 and connects the outer peripheral portion of the diaphragm 10 and the inner peripheral portion of the support member 40 . Specifically, the inner peripheral portion of the connecting member 52 is fixed to the reinforcing portion 13 (see below) of the outer peripheral portion of the diaphragm 10, and the outer peripheral portion of the connecting member 52 is connected to the supporting member 40 by the connecting member 51. It is fixed to the inner peripheral portion on the rear side of the connected portion. Thereby, the connection member 52 connects the support member 40 and the diaphragm 10 . Also, the connecting member 52 has a rolled shape to protrude rearward of the speaker 100 . The rolling shape of the connecting member 52 may be provided over the entire circumference of the ring. The connecting member 52 and the connecting member 51 have vertically symmetrical cross-sectional shapes in FIG. Thereby, the distortion characteristics of the diaphragm 10 can be improved.

Next, a detailed configuration of diaphragm 10 will be described with reference to FIGS. 6 and 7. FIG.

FIG. 6 is an enlarged view of the cross section of the diaphragm. FIG. 7 is a plan view of the diaphragm and voice coil body as seen from the rear. 7, the reinforcing portion 13 (see below) of the diaphragm 10 is omitted.

Diaphragm 10 has flat diaphragm main body 11 with uniform thickness and weight 12 .

The diaphragm main body 11 has a main member 11a and a reinforcing layer 11b.

The main member 11a has a circular outer shape and a flat plate shape. The main member 11a is made of foamed resin, for example. The reinforcing layer 11b is a thin-film member arranged on the front and rear surfaces of the main member 11a in a size and position overlapping the main member 11a. The reinforcing layer 11b is made of carbon, metal, or the like, for example. When the reinforcement layer 11b is made of metal, it is made of a material containing any one of aluminum, magnesium, and titanium, for example.

The weight 12 is arranged in an inner portion 11 c inside the voice coil body 30 of the diaphragm body 11 . The weight 12 is arranged on the surface of the diaphragm main body 11 to which the voice coil body 30 is fixed. The weight 12 is fixed to the inner peripheral surface 32 a of the voice coil body 30 , specifically to the inner peripheral surface 32 a of the bobbin 32 . The weight 12 has an outer periphery with the same shape as the inner periphery of the voice coil body 30 and is fixed to the inner peripheral surface 32a of the voice coil body 30 at the outer periphery. That is, the weight 12 is fixed to the entire circumference of the inner peripheral surface 32a of the voice coil body 30 over the entire outer circumference. Weight 12 is fixed to diaphragm main body 11 and voice coil body 30 with, for example, an adhesive.

Further, the weight 12 may have an opening 12a. That is, the weight 12 may have an annular shape. For example, the opening 12 a has a shape that is concentric with the circular shape of the weight 12 . In addition, the opening 12a may be circular or other shapes such as a polygon.

Further, the weight 12 may be made of foamed resin similar to that of the main member 11a, for example.

As described above, the diaphragm 10 has the weight 12 arranged in the inner portion 11 c inside the voice coil body 30 of the diaphragm body 11 . Therefore, in the diaphragm 10, when the diaphragm 10 is viewed from above, the weight per unit area of the first portion A1 inside the voice coil body 30 of the diaphragm 10 is equal to the weight per unit area of the first portion A1 outside the voice coil body 30. greater than the weight per unit area of the two parts 1; That is, the value obtained by dividing the weight of the first portion A1 by the area of the first portion A1 when the diaphragm 10 is viewed in plan is the weight of the second portion A2 when the diaphragm 10 is viewed in plan. greater than the value divided by the area of That is, the weight 12 is arranged on the first portion A1 of the diaphragm 10, and no weight is arranged on the second portion A2. Thereby, the weight per unit area of the first portion A1 becomes larger than the weight per unit area of the second portion A2.

Diaphragm 10 may further have a reinforcing portion 13 arranged on the rear surface of the outer peripheral portion and protruding rearward. The reinforcing portion 13 is a portion to which the connection member 52 is fixed at the rear end.

[2. effects, etc.]
As described above, speaker 100 in this embodiment includes diaphragm 10 , magnetic circuit 20 , voice coil body 30 , and support member 40 . At least one surface of diaphragm 10 is flat. Magnetic circuit 20 has a magnetic gap 25 . The voice coil body 30 has one end disposed within the magnetic gap 25 of the magnetic circuit 20 and the other end fixed to the diaphragm 10 . The support member 40 is a tubular member that supports the diaphragm 10 . The connecting member 51 is arranged on the front side of the diaphragm 10, connects the outer peripheral portion of the diaphragm 10 and the inner peripheral portion of the support member 40, and is an annular member having a rolled shape so as to protrude forward. be. The connecting member 52 is arranged on the rear side of the diaphragm 10, connects the outer peripheral portion of the diaphragm 10 and the inner peripheral portion of the support member 40, and has an annular shape having a rolled shape so as to protrude rearward. It is a member. The magnetic circuit 20 is arranged inside the connecting member 52 . Diaphragm 10 has a first portion with increased weight, which is a first portion inside voice coil body 30 of diaphragm 10 when diaphragm 10 is viewed from above.

Moreover, in the speaker 100, when the diaphragm 10 is viewed from above, the weight of the first portion is larger than the weight of the second portion.

Further, in the speaker 100, when the diaphragm 10 is viewed from above, the weight per unit area of the first portion is larger than the weight per unit area of the second portion.

For this reason, in the speaker 100 including the planar diaphragm 10, in the inner region inside the position of the node of the primary resonance mode of the speaker, the first region of the inner region and the first region on the outer peripheral side of the first region It is possible to cause a difference in vibration between the two regions, and to cancel the vibration of the diaphragm 10 as a whole. For example, diaphragm 10 of speaker 100 according to the present embodiment has a weight arranged in a first region near the center of the inner region, as in the vibration model shown in FIG. Therefore, the second area can be moved downward at the same timing as the first area is moved upward, and the vibration of the diaphragm 10 as a whole can be canceled even if the diaphragm 10 is flat. Therefore, as shown in FIG. 9B, the vibration mode of the diaphragm 10 can be flattened over the entire diaphragm 10 . Thereby, the primary resonance mode of the diaphragm 10 can be suppressed. As a result, as shown by "with weight" in FIG. 10, it is possible to reduce the peak dip that occurs in the case of "without weight". Therefore, the sound pressure frequency characteristics of the speaker 100 can be improved.

FIG. 8 is a diagram showing a vibration model of the diaphragm according to this embodiment. FIG. 9 is a diagram showing vibration modes in a diaphragm without weight and a diaphragm with weight. FIG. 10 is a diagram showing sound pressure frequency characteristics of a speaker using a weightless diaphragm and a speaker using a weightless diaphragm.

In speaker 100 , diaphragm 10 has diaphragm body 11 in the form of a flat plate, and weight 12 arranged in inner portion 11 c inside voice coil body 30 of diaphragm body 11 .

Therefore, by arranging the weight 12 in the inner portion 11c of the diaphragm main body 11, the weight per unit area of the first portion of the diaphragm 10 can easily be made larger than the weight per unit area of the second portion. can do.

In the speaker 100, the weight 12 is arranged on the surface of the diaphragm main body 11 to which the voice coil body 30 is fixed.

Therefore, the weight 12 can be arranged at a position that is difficult to see from the outside, and the appearance of the speaker 100 can be improved.

Further, in speaker 100 , weight 12 is fixed to inner peripheral surface 32 a of voice coil body 30 . According to this, weight 12 is fixed to diaphragm 10 and voice coil body 30 . Therefore, the diaphragm 10 and the voice coil body 30 can be fixed more firmly.

Further, in the speaker 100, the weight 12 has an opening 12a. Therefore, the weight of the weight 12 can be easily adjusted by adjusting the size of the opening 12a.

Further, in the speaker 100, the weight 12 is made of foamed resin. Therefore, the processing of the weight 12 can be facilitated. Also, the weight 12 can be easily fixed to the diaphragm 10 .

[3. Modification]
[3-1. Modification 1]
In the speaker according to Modification 1, a diaphragm having a weight placed at a position where the center of gravity of the weight does not overlap with the center of gravity of diaphragm main body 11 may be employed. Thereby, the diaphragm can be vibrated in a wide frequency band, and the sound pressure frequency characteristics of the speaker can be improved.

[3-2. Modification 2]
Diaphragm 10 according to Embodiment 1 is configured to have weight 12, but the configuration is not limited to this. For example, the inner portion 11c of the diaphragm main body of the diaphragm 10 may employ a diaphragm using a material having a higher specific gravity than the material outside the voice coil body 30 . Even with such a configuration, the weight per unit area of the first portion of the diaphragm can be made larger than the weight per unit area of the second portion. is played.

[3-3. Modification 3]
Although the weight 12 according to the first embodiment has an independent structure, a part of another member may be used. For example, a part of the voice coil body may be used as a weight. In this case, the end of the bobbin of the voice coil body that is to be fixed to the diaphragm is bent inward substantially perpendicularly, and the bent portion is fixed to the diaphragm. As a result, the bent portion of the bobbin may be used as a weight. In this case, the bobbin may have a plurality of bent portions. In the case of a plurality of bent portions, all the bent portions may be bent inward, or may include a portion bent outward. good. When a portion that is partially bent outward is included, the total weight of the portion that is bent inward is greater than the total weight of the portion that is bent outward.

In this way, even when a part of the voice coil body is used as a weight, the same effect as the speaker 100 of the first embodiment can be obtained.

[3-4. Modification 4]
In the speaker 100 of the diaphragm 10 according to the first embodiment, the weight of the first portion is greater than the weight of the second portion when the diaphragm 10 is viewed from above. The weight of the second portion may be greater than the weight of the first portion. This is because even if the weight 12 is provided in the first portion, the weight of the second portion may be larger than the weight of the first portion depending on the size of the second portion.

(Embodiment 2)
FIG. 11 is a conceptual diagram of a mobile device equipped with a speaker according to Embodiment 2. FIG. The mobile device is, for example, an automobile, but is not limited to this, and may be a ship, an aircraft, a train, a motorcycle, or the like.

The mobile device 201 includes a main unit 202 , a driving unit 203 , an amplifying unit 211 and a speaker 100 . The driving unit 203 , the amplifying unit 211 and the speaker 100 are mounted on the main unit 202 . Note that the drive unit 203 may include an engine, a motor, tires, a handle, and the like. The output of the amplifier 211 is supplied to the speaker 100 . It should be noted that the amplifying section 211 may constitute a part of the car audio system. In that case, the amplification unit 211 may include a sound source reproducing device or the like. Furthermore, the amplifier 211 may constitute a part of the car navigation system. In that case, the amplification unit 211 may include a display device or the like.

In addition, when the main body part 202 includes the passenger space 202A, the speaker 100 is installed so as to emit sound to the passenger space 202A. In this case, the body portion 202 may further include an exterior portion 202B and an interior portion 202C. The exterior part 202B isolates the passenger space 202A from the outside. Exterior part 202B is, for example, roof 202D and door 202E. The interior portion 202C is provided between the exterior portion 202B and the passenger space 202A. The speaker 100 is housed between the interior portion 202C and the exterior portion 202B. Note that the place where the speaker 100 is installed is not limited to the above, and may be a dashboard or a rear tray.

With the above configuration, the speaker 100 is thin, so the distance between the interior portion 202C and the exterior portion 202B can be reduced. By mounting the speaker 100 on the mobile device 201 in this manner, the passenger space 202A can be expanded.

The embodiment described above is for facilitating the understanding of the present invention, and the material and shape of each component constituting the speaker 100 described in the embodiment can be changed variously, and the present invention can be changed. It is not meant to be construed as limiting.

As described above, the embodiment has been described as an example of the technique of the present disclosure. To that end, the accompanying drawings and detailed description have been provided.

Therefore, among the components described in the attached drawings and detailed description, there are not only components essential for solving the problem, but also components not essential for solving the problem in order to illustrate the above technology. can also be included. Therefore, it should not be immediately recognized that those non-essential components are essential just because they are described in the attached drawings and detailed description.

In addition, the above-described embodiments are intended to illustrate the technology of the present disclosure, and various modifications, replacements, additions, omissions, etc. can be made within the scope of the claims or equivalents thereof. Moreover, the above-described embodiments can be changed and improved without departing from the spirit thereof, and the above-described embodiments also include equivalents thereof.

INDUSTRIAL APPLICABILITY The present disclosure is applicable to speakers, electronic devices, mobile devices, etc. that use a flat diaphragm capable of improving sound pressure frequency characteristics.

Reference Signs List 10 diaphragm 11 diaphragm main body 11a main member 11b reinforcing layer 11c inner portion 12 weight 12a opening 13 reinforcing portion 20 magnetic circuit 21 permanent magnet 22 bottom plate 23 yoke 24 top plate 25 magnetic gap 30 voice coil body 31 voice coil 32 bobbin 32a Inner peripheral surface 40 Support member 51, 52 Connection member 61, 62 Input terminal 63 Relay wire 201 Mobile device 202 Body 202A Passing space 202B Exterior 202C Interior 202D Roof 202E Door 203 Drive 211 Amplifier A1 First portion A2 second part

Claims (10)

a diaphragm having at least one flat surface;
a magnetic circuit having a magnetic gap;
a voice coil body having one end disposed in the magnetic gap of the magnetic circuit and the other end fixed to the diaphragm;
a cylindrical support member that supports the diaphragm;
An annular first ring disposed on one surface side of the diaphragm, connecting an outer peripheral portion of the diaphragm and an inner peripheral portion of the support member, and having a rolled shape so as to protrude to the one side. a connecting member;
An annular second ring disposed on the other side of the diaphragm, connecting the outer periphery of the diaphragm and the inner periphery of the support member, and having a rolled shape so as to protrude to the other side. a connection member;
The magnetic circuit is arranged inside the second connection member,
The end of the bobbin of the voice coil body on the side fixed to the diaphragm is bent inward substantially perpendicularly, and the bent portion is fixed to the diaphragm to form a weight, whereby the diaphragm is viewed from above. , the weight of the first portion inside the voice coil body of the diaphragm is increased. 2. The speaker according to claim 1, wherein when the diaphragm is viewed from above, the weight of the first portion inside the voice coil body of the diaphragm is greater than the weight of the second portion outside the voice coil body. . 3. The speaker according to claim 1, wherein when the diaphragm is viewed in plan, the weight per unit area of the first portion is larger than the weight per unit area of the second portion outside the voice coil body. 4. The diaphragm according to any one of claims 1 to 3, wherein the diaphragm has a flat diaphragm main body and the weight disposed inside the diaphragm main body inside the voice coil body. speakers. 5. The speaker according to claim 4, wherein the weight is arranged on a surface of the diaphragm main body to which the voice coil body is fixed. The speaker according to claim 4 or 5, wherein the weight is fixed to the inner peripheral surface of the voice coil body. The speaker according to any one of claims 4 to 6, wherein the weight has an opening. The speaker according to any one of claims 4 to 7, wherein the weight is arranged at a position where the center of gravity of the weight does not overlap the center of gravity of the diaphragm body. A speaker according to any one of claims 1 to 8 ;
and a circuit unit that inputs an electric signal to the speaker. A speaker according to any one of claims 1 to 8 ;
a circuit unit for inputting an electrical signal to the speaker;
A mobile device comprising: a self-propelled main body on which the speaker and the circuit unit are mounted.

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