JP2000308172A - Earphone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve comfortability at the time of wearing in the ear and to make an earphone hard to drop from the ear. SOLUTION: A recessed part 31 is formed at the central part of a supporting plate 29. The bottom part of the recessed part 31 is defined as a fixing plate 39 and a magnet part 33 and a pole piece 35 are laminated and fixed on this plate. On the supporting plate 29, an air hole 41 is formed near the magnet part 33 on the fixing plate 39, and a loop-shaped flat part 29b is formed around the outer periphery of the recessed part 31. On the fixing plate 39, together with the magnet part 33, a circuit board 37 is fixed so as to sandwich this magnet part. On the supporting plate 29, a vibrating film 45 is fixed so as to cover the recessed part 31. Over the side of the circuit board 37 of the supporting plate 29, a back case 49 having the flange part 49b is placed with its flange part 49b abutted to the flat part 29b. A front case 51 having a plurality of sound holes 53 is fixed on the supporting plate 29 and the back case 49 so as to cover the vibrating film 45.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earphone for music reproduction or communication, and more particularly to an improvement in an inner earphone used in a miniature headphone, for example, which is used in an ear canal cavity.

[0002]

2. Description of the Related Art Conventionally, as this kind of earphone, a configuration as shown in FIG. 10 is known. That is, a columnar concave portion 3 is formed at a substantially central portion of the disk-shaped support plate 1,
A cylindrical magnet part 5 and a disk-shaped pole piece 7 are coaxially stacked in the recess 3 and fixed with play, and the vibration film 9 is fixed to a rising portion 1 a provided on a peripheral portion of the support plate 1. To cover the concave portion 3 and the pole piece 7, and the voice coil 11 between the magnet portion 5 and the pole piece 7 and the inner wall of the concave portion 3.
Is supported by the vibrating membrane 9 in a state where the voice coil 1 is loosely inserted, and the circuit board 13 is fixed to the outer bottom of the concave portion 3.
A lead wire 11a extending from the support plate 1 is led out from the outer periphery of the rising portion 1a of the support plate 1 to the facing side (back side), and passes through the flat portion 1b formed on the support plate 1 and formed on the outer periphery of the concave portion 3.
1a is connected to the circuit board 13 while covering the recess 3 and the circuit board 13 with the back case 15 so as to abut on the periphery of the support plate 1 to form a flat front surface having a plurality of sound holes 17. The case 19 is fixed by covering the outer periphery of the support plate 1 and the tip of the rear case 15 so as to cover the vibration film 9.

In addition, a plurality of ventilation holes 21 communicating between the vibrating membrane 9 as the front side and the rear case 15 as the rear side are supported so that a wide frequency characteristic can be obtained while maintaining the low frequency characteristics of the earphone. The rear case 15 has a cup shape that is curved and swelled in a semi-elliptical shape so that an acoustic space is formed on the back side of the ventilation holes 21 while being formed through the flat portion 1 b of the plate 1. I was

[0004] Reference numeral 23 in FIG. 10 denotes a lead wire 11 a of the voice coil 11 led out from the diaphragm 9 to the circuit board 13.
Is fixed to the flat portion 1b of the support plate 1 to prevent disconnection and the like. For convenience, the adhesive is shown overlapping the ventilation hole 21 in the figure, but is actually adhered to a place where the ventilation hole 21 is not closed. Agent 2
3 are bonded.

Further, the lead wire 11 of the voice coil 11
In order to prevent the flux or solder dust scattered when soldering a to the circuit board 13 from directly adhering to the vibration film 9 via the air holes 21 and deteriorating its performance, the air holes 21 are formed by a breathable net (not shown). The closing is done. The circuit board 13 is a relay terminal plate that connects a cable (not shown) connecting electronic devices such as a recording / reproducing device and a communication device to the lead wire 11a of the voice coil 11.

[0006] Such an earphone has a front case 19.
Is slightly curved and swells toward the front side at the center portion, while the rear case 15 has an outer shape that largely curves and swells toward the back side in a semi-elliptical shape, and as shown in FIG. As shown in FIG. 12, the front case 19 is fitted toward the external auditory canal 25e side into the auricle cavity 25d formed so as to be surrounded by the anti-wheel 25a, the anti-tragus 25b, and the tragus 25c. It is used so as to hold down the rear case 15 at 25c. Reference numeral 25f in FIG.

[0007]

However, in the above-mentioned conventional earphone, since the rear case 15 is also curved in a semi-elliptical shape near the open front end thereof, when it is fitted into the ear canal cavity 25d. While the back case 15 is mainly supported by the tragus 25b and the tragus 25c, the tragus 25b and the tragus 25c are pressed against the back case 15 to give a feeling of oppression and pain depending on the user. There is.

Further, the curved portion of the rear case 15 is
b and the tragus 25c tend to always be pressed, so that the earphone is easily detached from the ear 25. Furthermore,
In the above-mentioned earphone, since the ventilation hole 21 is provided in the flat portion 1b formed on the outer periphery of the concave portion 3 in the support plate 1, the lead wire 11a of the voice coil 11 is connected to the circuit board 13
It is necessary to close the air holes 21 with a gas permeable net (not shown) so that the flux or solder dust scattered when soldering to the vibration film 9 does not adhere through the air holes 21. This was an obstacle to cost reduction.

On the other hand, in the human ear 25, as shown in FIG.
Generally, the ear canal 25e extends from the ear canal cavity 25d to the human head 2
7, the magnet 5, the diaphragm 9 and the voice coil 1 in the earphone.
1 and the like, the central axis X of the speaker section is shifted in both angle and position with respect to the central axis Y of the external auditory canal 25e, and the speaker section (central axis X) is opposed to the central axis Y with a large inclination. The sound from No. 9 is hard to be radiated along the central axis Y, and “the sensitivity becomes low”, “the high sound attenuates”,
There is also a difficulty that the acoustic characteristics are easily deteriorated, such as "the bass is attenuated."

[0010] The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide an earphone that improves comfort when worn on an ear and reduces falling off from the ear. Another object of the present invention is to provide an earphone that can easily reduce component parts and manufacturing steps and reduce costs while ensuring good acoustic characteristics.

[0011]

SUMMARY OF THE INVENTION In order to solve such a problem, the present invention provides a magnet section forming a speaker section of an earphone, an annular section formed on one side of the magnet section and supporting the magnet section. A supporting plate having a flat portion, a vibrating film having a voice coil, and being supported by the supporting plate so as to cover the front surface of the magnet portion with a space therebetween and forming a speaker portion, and an arrangement of the vibrating film A back case covered on the support plate with the side not to be used as the back side,
A front case having a plurality of sound through holes penetrating therethrough and covered on the support plate so as to cover the diaphragm, wherein the rear case has an annular flat flange abutting on a flat portion of the support plate. And is directly or indirectly connected to the front case via the flange portion.

In the present invention, a ventilation hole is formed through the support plate at the base of the magnet part, and a closing plate is disposed on the back side of the supporting plate. A configuration that overlaps the ventilation hole is also possible. Further, in the present invention, a configuration using a circuit board for connecting the lead wire of the voice coil to the outside is also possible as the closing plate.

Further, in the present invention, it is preferable that the front case is provided with a bulging portion in which a region closer to one end from the center axis of the speaker portion bulges in the direction of the center axis than other regions. Furthermore, in the present invention, a configuration is also possible in which a protruding portion for inserting an external auditory canal having a sound through hole at the protruding tip protrudes from the protruding portion of the front case.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of an earphone according to the present invention. In FIG. 1, the support plate 29
Has a concave portion 31 as a storage portion, which is formed by bending a substantially central portion of a disk-shaped thin steel plate so as to be concave in a columnar shape, and functions as a yoke plate or a frame.

In this concave portion 31, a laminated thin columnar magnetized magnet portion 33 and an iron disk-shaped pole piece 35 are placed at a predetermined equal interval from the inner peripheral wall of the concave portion 31, and the magnet portion 33 is provided. Are arranged so as to contact the inner bottom of the concave portion 31.

At the bottom of the concave portion 31, a magnet 33
A disc-shaped circuit board 37 serving as a relay board is disposed on a surface (outer surface) opposed to the contact surface (inner surface) so that the magnet portion 33, the pole piece 35, and the circuit board 37 are supported by the support plate. 1 is coaxially fixed.

That is, as shown in FIGS. 2 and 3,
At the bottom of the recess 31 of the support plate 29, the magnet 33
The fixed plate 3 protruded rearward in the axial direction with a dimension about the thickness of the bottom portion in an area overlapping with or slightly larger than this.
Around the fixing plate 39, in other words, around the base of the magnet part 33, a plurality of ventilation holes 41 are formed so as to be annularly dispersed and penetrate the inner surface and the outer surface.

For this reason, the fixing plate 39 is supported and connected between the adjacent ventilation holes 41 at the bottom of the concave portion 31 and has a shape further protruding from the bottom.

As a method of forming the concave portion 31, the fixing plate 39, and the ventilation hole 41 in the support plate 29, for example,
A plurality of vents 41 are punched and formed in the bottom, and then a region surrounded by the vents 41 is slightly punched to form a fixing plate 39. Can be The forming order and processing method are not limited to these.

As shown in FIG. 3, the fixing plate 39, the magnet part 33, the pole piece 35, and the circuit board 37 have
Through holes 39a, 33a, 35a, and 37a having substantially the same diameter are formed coaxially, and the through holes 37a, 39a of the circuit board 37, the fixing plate 39, the magnet 33, and the pole piece 35 are formed from the circuit board 37 side. , 33a, and 35a are inserted through the eyelets 43 (not shown in FIG. 1), and the ends of the eyelets 43 are caulked on the pole pieces 35 on the pole piece 35 side, and the circuit board 37, the magnet part 33, and the pole pieces 35 are formed. Are fixed to the support plate 29.

Further, the circuit board 37 is formed to have substantially the same or slightly larger diameter as the peripheral end of the ventilation hole 41 in the radial direction of the concave portion 31, and to close the ventilation hole 41 as shown in FIG. At the same time, a slight slit-shaped space S is formed between the bottom surface of the support plate 29 and the ventilation hole 41 by an amount protruding from the bottom of the support plate 29, and the front side and the back side of the support plate 29 are ventilated. That is, the circuit board 37 functions as a closing plate for the ventilation hole 41.

For this reason, the fixing plate 3 extends from the bottom of the support plate 29.
By adjusting the amount of protrusion of 9 and the outer diameter of the circuit board 37, the substantial size of the ventilation hole 41 can be adjusted.
The support plate 29 has an annular upright portion 29a whose outer peripheral end is slightly bent, and a region from the recess 31 to the upright portion 29a has an annular flat portion 29b as shown in FIG. It has become.

Returning to FIG. 1, a conventionally known vibration film 45 made of, for example, a polyester film (PET) is disposed on the support plate 29 so as to cover the concave portion 31, and the periphery thereof is fixed to the rising portion 29a. .

On the outer periphery of the magnet part 33 and the pole piece 35, for example, a conventionally known cylindrical voice coil 47 in which a polyurethane-coated conductor is wound in a cylindrical shape is loosely inserted with a space between the cylindrical voice coil 47 and the side wall of the recess 31. This voice coil 4
7 has one end face supported by the vibrating membrane 45, and this lead wire 47a is led out through the hollow portion 43a of the eyelet 43 and connected to the circuit board 37 to form a dynamic speaker portion.

On the circuit board 37 side of the support plate 29, that is, on the back side, a back case 49 molded from, for example, ABS resin is covered so as to cover the recess 31.

The rear case 49 has a cap portion 49a that fits into the concave portion 31 so as to cover the circuit board 37 of the support plate 29, and has an annular shape having substantially the same shape as the flat portion 29b of the support plate 29 from the cap portion 49a to the tip. It has a flange portion 49b (see FIG. 4A), and the flange portion 49b is brought into contact with the flat portion 29b of the support plate 29 and is appropriately fixed.

On the vibrating membrane 45 side of the supporting plate 29, that is, on the front side, a relatively flat disk-shaped front case 51 which is molded from, for example, ABS resin, has a slightly bulged shape, and is of equal thickness and relatively flat.
Is covered so as to cover the vibration film 45.

The front case 51 has a number of small-diameter sound holes 53 dispersedly formed so as to penetrate therethrough. As will be described later, a thickness T of an area (upper side in the figure) facing the ear canal 25e during use is used. Bulging portion 51 bulging in the direction of the central axis X of the speaker portion more than the thickness t of the other region.
a (see FIG. 4B).

In FIG. 1, reference symbol T indicates the axial thickness of the region of the bulging portion 51a shifted upward from the center axis X of the speaker portion, and symbol t indicates the axial thickness of the region shifted downward. As shown, the bulging portion 51a is formed in the front case 51 so as to be an upper region in use.

As shown in FIG. 5, the earphone according to the present invention has an antitragus 25b, an tragus 25c, and an iris 25f.
The front case 51 is used so as to fit into the ear canal cavity 25d formed therebetween, and the upper region of the front case 51 is formed thicker than the lower region. External ear canal 2 that fits and extends obliquely upward
5e is mounted so that the central axis X faces the central axis Y with a slight angle shift or coincidence with the central axis Y.

In the earphone of the present invention, a cable for connecting the circuit board 37 to an external electronic device is required, and a protection protrusion for protecting the cable at a portion where the cable is led out from the rear case 49 to the outside. Is generally provided integrally from the rear case 49. However, since it is not a main part of the present invention, illustration and detailed description are omitted.

As described above, in the earphone of the present invention, the columnar recess 31 is formed in the center of the support plate 29, and the bottom of the recess 31 is slightly protruded to the rear side to form the fixing plate 39. 33 and the pole pieces 35 are fixed in the recess 31 so as to be placed on the fixing plate 39, and a circuit board 37 is fixed on the opposite surface side of the fixing plate 39. A ventilation hole 41 is formed near the base of the support plate 29, an annular flat portion 29 b is formed in the outer periphery of the concave portion 31 in the support plate 29, and the diaphragm 45 is fixed to the support plate 29 so as to cover the concave portion 31. On the circuit board 37 side, that is, on the back side, an annular flange portion 49 is provided.
b is placed on the concave portion 31 of the support plate 29 so as to cover the circuit board 37, and the flange portion 49b is brought into contact with the flat portion 29b. The cover 45 is fixed to the support plate 29 and the rear case 49 so as to cover the cover 45.

Therefore, the rear case 49 is supported by the support plate 2 via a flat flange portion 49b abutting on the support plate 29.
9 and the front case 51.
The earphone is easy to fit in the auricle cavity 25d because the vicinity of the open end of the horn no longer bulges out.
5c is not pressed unnecessarily.

Therefore, for the user, the rear case 49
This makes it difficult for the user to feel pressure and pain on the tragus 25b and the tragus 25c, thereby ensuring comfortable wearing to the ears and reducing the dropout from the ears.

At the bottom of the concave portion 31 of the support plate 29, the circuit board 37 is overlapped so as to close the ventilation hole 41 formed near the base of the magnet portion 33 and to form a slight slit-shaped space S. As a result, the ventilation hole 41 is hidden by the circuit board 37 and the slit-shaped interval S can be reduced.

Therefore, compared to the conventional ventilation hole 21, the flux and solder dust scattered when the lead wire 47 a of the voice coil 47 is soldered to the circuit board 35 are less likely to adhere to the vibration film 45 through the ventilation hole 41. In addition, it is not necessary to separately cover the ventilation hole 41 with a ventilation net or the like, so that it is easy to reduce the cost due to a reduction in the number of components and the number of manufacturing steps. The combination of the two members makes it easy to narrow the interval S and also makes the adjustment easy, so that the frequency characteristics can be improved through the adjustment in the low frequency range.

By the way, in the conventional earphone shown in FIG. 10, the vent hole 21 is generally formed by press working, but the inner diameter is 0.5 mm to 1.2 mm, and actually 0.7 mm to 1 mm. The diameter is relatively large, about 0.2 mm, and it is difficult to finely adjust the inner diameter. Ventilation hole 2 with inner diameter of 0.5 mm or more
In No. 1, it is considered that it is difficult to change the frequency characteristics even if the inner diameter is adjusted.

On the other hand, as shown in the present invention, the ventilation holes 41
And the slit-shaped interval S by the circuit board 37,
The interval S can be finely adjusted from about 0.2 mm to about 1 mm, and can be adjusted from a low frequency to a high frequency, so that a wide frequency band can be secured.

Further, the front case 51 has a bulging portion 51a in which the thickness T of the region facing the ear canal 25e in use is bulged more in the direction of the central axis than the thickness t of the other regions. In the earphone, the center axis X of the speaker section formed by the magnet section 5, the vibrating membrane 9, the voice coil 11, and the like is more easily directed obliquely upward as compared with the conventional configuration, and generally the head axis 27d extends from the ear canal cavity 25d to the head 27. The speaker axis X of the earphone is aligned with the center axis Y of the ear canal 25e with respect to the ear canal 25e extending obliquely inward and upward (see FIG. 12), or the angle of deviation is smaller than in the past, and the diaphragm 45
From the outside ear canal 25e more easily propagates along the central axis Y.

As a result, it is difficult to lower the sensitivity and decrease the attenuation in the low-pitched / high-pitched sound area, thereby making it difficult to lower the acoustic characteristics.
-Fi characteristics can be secured.

Although the above-described earphone uses a relatively flat disk-shaped front case 51 having a slightly bulging shape, the present invention is not limited to this.

For example, as shown in FIG.
In the one bulging portion 51a, a configuration is also possible in which a protruding portion 57 for inserting an external auditory canal having a sound through hole 55 at a protruding tip is integrally protruded.

The protruding portion 57 is formed at the center of the ear canal 25e so that when the earphone according to the present invention is mounted in the auricle cavity 25d, the earphone is inserted into the ear canal 25e of a general user so as to close the ear canal without any discomfort. It protrudes in a direction that coincides with the axis Y at an angle and an outer diameter that are empirically selected.

As described above, the bulging portion 51 of the front case 51
In the configuration in which the protruding portion 57 protrudes from the
When the protruding portion 57 is inserted into the external auditory canal 25e, as compared with the configuration shown in FIG.
Alternatively, there is almost no gap between the ear canal 25e and sound leakage is reduced, and the frequency characteristic is further improved as shown in FIG.

In FIG. 7, the broken line indicates the frequency characteristic in the configuration shown in FIG. 1 without the projection 57, the solid line indicates the frequency characteristic in the configuration as shown in FIG. 9 shows a frequency characteristic of a conventional earphone.

According to FIG. 7, FIG.
Even with such a configuration, except that the bass range is easily attenuated somewhat,
It can be seen that a frequency characteristic substantially similar to that of the configuration shown in FIG. 6 can be obtained, and that the conventional earphone attenuates both the low frequency range and the high frequency range.

Further, in the earphone according to the present invention, as described above, the air holes 41 formed in the concave portions 31 are not limited to the configuration in which the circuit board 37 is used as a closing plate to form a narrow space S, and FIGS. The configuration shown in FIG. 9 is also possible.

That is, a ring plate 59 integrally having a ring portion 59a and a cylindrical portion 59b extending in the axial direction from the inside is used. The cylindrical portion 59b is fitted on the outer periphery of the disc-shaped circuit board 37, and the ventilation hole 41 is formed. A configuration is also possible in which the ring portions 59a are overlapped at a slight interval with respect to. In FIG. 9, illustrations corresponding to the eyelets and the insertion holes in FIG. 3 are omitted.

As described above, in the configuration in which the ring plate 59 is superimposed on the outer periphery of the circuit board 37 as a closing plate, unlike the above-described configuration using only the circuit board 37, the degree of fitting of the ring plate 59 into the circuit board 37 is adjusted. This makes it easy to adjust the frequency characteristics even after the rising portions 29a and the ventilation holes 41 of the support plate 29 are formed, and different frequency characteristics from the supporting plates 29 having the same shape of the rising portions 29a and the ventilation holes 41. Is obtained.

However, in the configuration using only the circuit board 37, the circuit board 37 for connecting the lead wire 47a from the voice coil 47 to the outside is also used, and the acoustic frequency characteristic is greatly increased without increasing the number of components. Adjustment is possible.

In the above configuration, the voice coil 4
7, the lead wire 47a is led out toward the circuit board 37 through the hollow portion 43a of the eyelet 43. In the present invention, at least the inner region of the annular flat portion 29b,
The object of the present invention can be achieved if an appropriate insertion hole is formed and led out.

Further, in the earphone of the present invention, the flat portion 29b of the support plate 29 and the flange portion 49b of the rear case 49 do not need to be completely annular, circular or ring-shaped. It is possible to achieve the purpose.

Furthermore, in the present invention described above, the area of the front case 51 which is shifted upward from the center axis X of the speaker section is configured as the bulging section 51a. However, depending on the overall shape of the earphone, it may be lower or lower. It is also possible to have a configuration in which the region closer to the left and right is a bulging portion, and a bulging portion is provided in which the region closer to one end from the center axis of the speaker portion bulges in the direction of the center axis than the other region. If this is the case, the object of the present invention can be achieved.

In implementing the earphone of the present invention, the rear case 49, the support plate 29 and the front case 51
It is also possible to adopt a configuration in which these are fixed directly or indirectly by interposing another member between them, and the support plate 29 does not necessarily need to have the recess 31 for storage, and the speaker unit is provided on one side of the flat support plate. Is formed, and the circuit board 37 is formed on the facing surface.
Etc. can be arranged.

[0056]

As described above, according to the present invention, there is provided a magnet portion forming a speaker portion of an earphone, a support plate having an annular flat portion formed around the magnet portion which supports the magnet portion on one side. A vibrating membrane having a voice coil, supported on a support plate at a distance from the front side of the magnet part to cover the same, and forming a speaker part, and a vibrating membrane having a plurality of sound through holes penetrating therethrough. A front case is provided so as to cover the support plate, and a cup-shaped rear case is provided on the support plate with the side on which the diaphragm is not disposed as a back side, and the rear case contacts the flat portion of the support plate. Since it has an annular flange portion in contact with it and is directly or indirectly connected to the front case via this flange portion, it is possible to improve the wearing comfort to the ear and to reduce the dropout from the ear.
A ventilation hole is formed in the support plate at the base of the magnet part, a closing plate is arranged on the back side of the support plate, and the closing plate is overlapped with the ventilation hole at a slight interval. It is possible to reduce the number of manufacturing steps and cost while ensuring excellent acoustic characteristics. In addition, the configuration using a circuit board as the closing plate allows the circuit board to be used for connecting the lead wire from the voice coil to the outside, and provides good acoustic frequency characteristics without increasing the number of parts and manufacturing steps. Can be maintained and adjusted. Further, in the front case, a configuration is provided in which a bulging portion is formed by bulging a region closer to one end from the central axis of the speaker unit in the direction of the central axis than other regions. Sensitivity and wide frequency characteristics can be secured. Still further, in the configuration in which the protruding portion for inserting the external auditory canal having a sound passage hole at the protruding tip in the protruding portion of the front case protrudes, it is possible to ensure better acoustic sensitivity and wider frequency characteristics.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of an earphone according to the present invention.

FIG. 2 is a cross-sectional view of a main part showing a vicinity of a support plate and a magnet part in FIG.

FIG. 3 is an exploded perspective view showing the vicinity of a support plate and a magnet portion in FIG. 1 in an exploded manner.

FIG. 4 is a perspective view showing a rear case and a front case in FIG. 1;

FIG. 5 is a sectional view showing an example of use of the earphone according to FIG. 1;

FIG. 6 is a cross-sectional view showing another embodiment of the earphone according to the present invention together with a usage example.

FIG. 7 is a frequency characteristic diagram of the present invention and a conventional earphone.

FIG. 8 shows another configuration of the earphone according to the present invention.
FIG. 3 is an exploded perspective view of a main part showing a circuit board and a ring part fixed to the circuit board.

9 is a cross-sectional view of a main part showing the vicinity of a magnet and a support plate using the ring portion of FIG. 8 in the earphone of the present invention.

FIG. 10 is a sectional view showing a conventional earphone.

FIG. 11 is a perspective view schematically showing the structure of a human ear.

FIG. 12 is a sectional view showing an example of use of a conventional earphone.

[Explanation of symbols]

 1, 29 Support plate 1a, 29a Rise 1b, 29b Flat part 3, 31 Concave part 5, 33 Magnet part 7, 35 Pole piece 9, 45 Vibration membrane 11, 47 Voice coil 11a, 47a Lead wire 13 Circuit board 15, 49 Back case 17, 53, 55 Sound through hole 19, 51 Front case 21, 41 Vent hole 23 Adhesive 25 Ear 25a Contra-ring 25b Anti-tragus 25c Tragus 25d Ear hole cavity 25e External auditory canal 25f Ear ring 27 Head 33a, 35a, 37a 39a through hole 37 circuit board (closing plate) 39 fixing plate 43 eyelet 43a hollow portion 49a cap portion 49b flange portion 51a bulging portion 57 projecting portion 59 ring plate (closing plate) 59a ring portion 59b cylindrical portion

Claims (5)

[Claims] 1. A magnet part forming a speaker part of an earphone, a support plate supporting the magnet part on one surface side and having an annular flat part formed around the magnet part, and a voice coil, the magnet part comprising: A vibrating membrane supported by the support plate to cover the front face side at a distance therefrom to form the speaker unit; and a cup covered on the support plate with the side on which the vibrating membrane is not disposed facing the rear side A rear case having a plurality of sound through holes penetrating therethrough, and a front case covered with the support plate so as to cover the vibrating membrane, wherein the rear case is provided on a flat portion of the support plate. An earphone having an annular flat flange portion in contact with the earphone and being directly or indirectly connected to the front case via the flange portion. 2. A ventilation hole is formed through the support plate at the base of the magnet portion, and a closing plate is disposed on the back side of the support plate. The earphone according to claim 1, wherein the earphones are overlapped. 3. The closing plate is a circuit board for connecting a lead wire from the voice coil to the outside.
Or the earphone according to 2. 4. The front case according to claim 1, wherein the front case has a bulging portion in which a region closer to one end from the center axis of the speaker portion is bulged in the direction of the center axis more than other regions. An earphone according to any one of the preceding claims. 5. The earphone according to claim 4, wherein the front case is formed such that a projecting portion for inserting an external auditory canal having the sound passage hole at a projecting end projects from the bulging portion.