JPWO2019058523A1 - Speaker device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve wearability to a user's ear in a speaker device. SOLUTION: A speaker unit 49 has a vibrating film 41, a yoke 29, a voice coil 43, and a drive unit 47 of the voice coil 43 inside. The case body 57 stores and supports the speaker portion 49. The case body 57 has a sound passage hole 55b for propagating sound to the outside in the vicinity of the outer edge of the speaker portion 49, and the outer surface facing the vibrating film 41 is a tragus contact surface 55c for the user. The case body 57 has a projecting portion 53b on the back side of the yoke 29, which is erected outward in a fan shape and is bent in a semi-cylindrical shape to project. The projecting portion 53b is an anti-pearl contact surface 53c with respect to the user. [Selection diagram] Fig. 1

Description

The present invention relates to a speaker device, and particularly relates to an improvement of an intraconca type speaker device used for an earphone worn on a user's ear.

Conventionally, as an intraconca type speaker device, for example, as shown in FIG. 7, one end face of a cylindrical drive magnet 5 is fixed in a cup-shaped yoke 3 arranged in a case body 1, and the other end face of the drive magnet 5 is fixed. The vibrating membrane 7 facing the end face of the yoke 3 is fixed to the open tip of the yoke 3, and the cylindrical voice coil 9 fixed to the vibrating membrane 7 is placed at a slight distance on the outer circumference of the drive magnet 5. The inserted configuration is well known.

In FIG. 7, the case body 1 includes a funnel-shaped case base 11a and a front cover 11b that covers the tip (right side in the drawing), and the tip of the opening of the yoke 3 is fixed in the front cover 11b.

Reference numeral 13 in FIG. 7 is a plurality of sound passage holes formed through the front cover 11b on the front surface of the vibrating membrane 7, and reference numeral 15 is a cable led out to the outside.

In this earphone device, a drive unit 17 that vibrates the vibrating membrane 7 is formed by a magnet 5 and a voice coil 9, and the vibrating membrane 7 is vibrated by applying a sound signal to the voice coil 9 from the outside via a cable 15. The sound is pronounced and the sound is propagated to the outside through the sound passage hole 13 on the front surface of the vibrating membrane 7.

In the speaker device as an actual product, the vibrating membrane 7 is brought close to the tragus 23 in the tragus cavity 25 surrounded by the tragus 19, the tragus 21, and the tragus 23 of the user's ear. Then, the case body 1 is inserted and positioned for use. That is, the speaker device described above is used by elastically supporting the case body 1 between the tragus 19 and the pair 21.

Note that FIG. 7 shows a state in which the earphone device is attached to the left ear.

By the way, as known examples of the intra-conca type earphone, there are Japanese Patent Application Laid-Open No. 8-172691 (Patent Document 1) and Japanese Patent Application Laid-Open No. 10-66181 (Patent Document 2).

Japanese Unexamined Patent Publication No. 8-172691 Japanese Unexamined Patent Publication No. 10-66181

However, the speaker device described above has a problem that the diameter of the speaker is easily limited because the case body (speaker portion) 1 has a shape of entering the concha cavity 25.

That is, for a user having a small ear size including the concha cavity 25, there is a problem that the tragus 19 and the tragus 21 are strongly pressed against each other by the case body 1 and the ear tends to hurt.

On the other hand, for users with large ears, the gap between the ear canal 27 and the case body 1 becomes large, resulting in insufficient bass reproduction, or the left side surface of the case body 1 (upper part in FIG. 7). When entering the ear canal 27, the vibrating film 7 of the speaker body 1 faces the ear canal 23 side, and the vibrating film 7 separates from the ear canal 27, so that the reproduced sound is not sufficiently transmitted to the ear canal 27. ..

As described above, the speaker device described above has a drawback that the wearability tends to depend on the shape and dimensions of the vibrating membrane 7 and the case body 1.

Moreover, although not shown in FIG. 7, in the conventional speaker device, from the viewpoint of adjusting the sound quality to obtain a desired frequency characteristic, the vibration of the acoustic tube having a predetermined length communicating with the inside and outside of the case body 1 and the vibration film 7 It is also known that a braking hole for applying braking to the displacement is formed in the case body 1.

When such an acoustic tube or a braking hole is formed in the case body 1, the size and formation position of the acoustic tube or the braking hole are restricted because the size of the speaker device is restricted due to the mounting mode on the user's ear. There is room for improvement in order to improve wearability and obtain high-quality reproduced sound.

In recent years, in speaker devices, particularly earphone devices, higher performance is required due to increasing market demand for sound quality improvement such as high resolution.

Therefore, as a result of intensive research on wearability, which has not received much attention in the past, the present inventor has found a new configuration and completed the present invention.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a speaker device capable of improving wearability and easily obtaining high-quality reproduced sound.

In order to solve such a problem, the configuration of the speaker device of the present invention includes a disc-shaped vibrating membrane, a magnetic yoke supporting the vibrating membrane, and a voice coil fixed to the yoke side of the vibrating membrane. The speaker unit includes a speaker unit that is arranged on the yoke and has a drive unit that displaces the voice coil by the applied voice signal to vibrate drive the vibrating membrane, and a case body that houses and supports the speaker unit.

Moreover, the case body is a sound passage hole formed through the vicinity of the outer edge of the speaker portion, and the sound passage hole for propagating the sound produced by the speaker portion to the user's ear canal and its vibration. An ear bead contact surface for contacting the ear bead facing the user's concha cavity on the outer surface facing this near the membrane, and a fan shape on the back side of the yoke from the case body to the outside. A projecting portion that is erected in a semi-cylindrical shape and is projecting by bending into a semi-cylindrical shape. It is characterized by having and.

The speaker device of the present invention may have a configuration in which the distance between the protruding portion of the case main body and the position farthest from the sound passage hole is 14 mm to 24 mm.

The speaker device of the present invention also has a configuration in which an acoustic tube is formed inside the protruding tip of the protruding portion so as to communicate with the inside of the case body at one end side of the fan shape and to communicate with the outside at the other end portion of the fan shape. It is possible.

The speaker device of the present invention may be configured to form a braking hole for acoustic braking that communicates the inside and the outside of the case body at a position surrounded by the projecting portion in the case body.

In such a configuration according to the speaker device of the present invention, the case body is formed through the vicinity of the outer edge of the speaker portion and is formed in the vicinity of the sound passage hole for propagating the sound produced to the external auditory canal and the vicinity of the vibrating membrane thereof. On the outer surface facing this, the tragus contact surface for contacting the tragus and the back side of the yoke are erected in a fan shape from the case body to the outside and bent into a semi-cylindrical shape to project. Since it has a projecting portion that is provided and has a projecting portion that forms an anti-ball contact surface for contacting the facing anti-ball, it can be mounted regardless of the size and shape of the case body that houses the speaker unit. It is easy to improve the sex.

In the conventional intra-conca type earphone device, since the entire case body for accommodating the speaker portion is accommodated in the concha cavity, there are restrictions on the diameter of the speaker portion, and it is difficult to increase the diameter of the speaker portion. Although it was difficult to improve the performance, in the present invention, since the sound passage hole of the case body is in contact with the ear canal, about half of the case body is projected outward, so that the limitation of the diameter of the speaker portion is reduced.

In the speaker device of the present invention, in the case body, the earphone device is configured in a configuration in which the distance between the protruding portion thereof farthest from the sound passage hole and the sound passage hole is selected to be 14 mm to 24 mm. Even if there is, it is possible to secure the above-mentioned effect.

Moreover, the above dimensions can be set with an emphasis on wearability, regardless of the diameter of the speaker body.

Further, the sound passage hole can be formed to be long and inserted by the ear canal, and it is also possible to suppress sound leakage from the gap and to make bass reproduction advantageous.

In the speaker device of the present invention, in the inside of the protruding tip of the protruding portion, an acoustic tube is formed in which one end side of the fan shape communicates with the inside of the case body and the other end portion of the fan shape communicates with the outside. , The acoustic tube is easy to form, and high quality reproduced sound can be adjusted through the adjustment of the acoustic tube.

Moreover, in this configuration, since the acoustic tube is formed at the portion of the ear condyle cavity that abuts on the opposite bead side, there is little structural waste.

In the speaker device of the present invention, in the configuration in which a braking hole for acoustic braking that communicates the inside and the outside of the case body is formed at a position surrounded by the protruding portion in the case body, it is easy to form the braking hole. Therefore, it is possible to adjust the reproduced sound with high quality through the adjustment of the braking holes.

Further, in this configuration, since the braking holes face the concha cavity side, it is possible to reduce sound leakage from the braking holes as compared with the conventional speaker device.

It is a cross-sectional view (cross section between I-I in FIG. 2) which concerns on the speaker apparatus of this invention. It is a front view of the speaker apparatus shown in FIG. It is a schematic perspective view of the speaker device shown in FIG. It is the schematic which shows the use example of the speaker apparatus shown in FIG. It is a schematic vertical sectional view (cross section between VV in FIG. 2) of the speaker apparatus shown in FIG. It is a frequency characteristic diagram which concerns on the speaker apparatus shown in FIG. It is the schematic sectional drawing which shows the conventional speaker apparatus together with the use example.

Hereinafter, embodiments of the speaker device according to the present invention will be described with reference to the drawings, taking, for example, an earphone device as an example.

1 to 3 are a cross-sectional view (cross section between I and I in FIG. 2), a front view, and a schematic perspective view showing a configuration according to the speaker device of the present invention.

In FIGS. 1 to 3, the yoke 29 is formed into a cup shape from a magnetic plate material, and the open end side (upper side in FIG. 1) of the tubular portion 29a has a ring plate shape made of a magnetic material. The flange 31 of the above is fixed, and a through hole is formed in the central portion of the bottom portion 29b of the yoke 29.

Inside the yoke 29, a cylindrical drive magnet 33 overlaps one end surface (lower side in FIG. 1) with the bottom portion 29b so that the hollow portion is aligned with the through hole of the bottom portion 29b, and is fixed in the yoke 29. It is stored.

A ring-shaped pole piece 35 having an outer diameter equal to or slightly larger than the outer diameter of the drive magnet 33 is superposed on the other end surface (upper side in FIG. 1) of the drive magnet 33. The pole piece 35 has a hollow portion aligned with the hollow portion of the drive magnet 33.

Circuit boards 37 having through holes in the central portion are stacked on the outer surface of the bottom portion 29b of the yoke 29 so as to align the through holes of the circuit boards 37 with the through holes of the bottom portion 29b.

The yoke 29, the drive magnet 33, the pole piece 35, and the circuit board 37 are crimped at both ends of a tubular fitting 39 that is penetrated from the pole piece 35 or the circuit board 37 side through their hollow portions and through holes. They are co-axially integrated by and secured to the bottom 29b of the yoke 29.

The yoke 29, the drive magnet 33, the pole piece 35, and the circuit board 37 may be coaxially fixed by an adhesive or the like (not shown).

The pole piece 35 is made of a magnetic material for concentrating magnetic flux in order to obtain high sound quality, and its outer circumference faces the circumference at substantially the same level as the tip of the tubular portion 29a of the yoke 29 and the inner circumference of the flange 31. are doing.

A magnetic circuit is formed by the magnetic flux from the yoke 29 between the outer circumference of the pole piece 35 and the tip of the tubular portion 29a of the yoke 29 and the inner peripheral portion of the flange 31 which face each other at a slight distance. ..

The vibrating film 41 is formed in a disk shape from a conventionally known thin and translucent insulating film material, and has a central region 41a in which a relatively wide central portion is slightly inflated into a dome shape and the central region 41a concentrically. It has an outer peripheral region 41b surrounded by a shape and an annular shape.

The vibrating film 41 covers the flange 31 and the pole piece 35 with a space, and the entire outer circumference of the outer peripheral region 41b is fixed to the outer peripheral portion of the flange 31 with an adhesive or the like and is supported by the vibrating film 41. ..

On one surface side (lower surface side in FIG. 1) of the vibrating membrane 41, a voice coil 43 formed by winding a thin insulating wire with an insulating coating in a cylindrical shape at an annular boundary between a central region 41a and an outer peripheral region 41b. One end face side is fixed so as to surround the central region 41a.

The voice coil 43 has the yoke 29, the drive magnet 33, and the pole piece 35 with respect to the annular gap between the inner wall of the tubular portion 29a of the yoke 29 and the inner peripheral portion of the flange 31 and the outer circumference of the drive magnet 33 and the pole piece 35. It is inserted with a slight gap between the two, and faces the flange 31, the yoke 29, and the drive magnet 33 in an annular shape.

The two lead wires at both ends (not shown) from the voice coil 43 are led out inward from the base of the voice coil 43, led out to the outside through the hollow portion 39a of the fit 39, and connected to the circuit board 37. ing.

An audio signal is supplied from an electronic device (not shown) to the circuit board 37 superposed on the bottom 29b of the yoke 29 by a cable 45 described later. The voice coil 43 is displaced by applying the audio signal from the circuit board 37 to the voice coil 43 via the lead wires at both ends, and the vibrating membrane 41 is driven to vibrate and displace.

That is, the yoke 29, the drive magnet 33, and the voice coil 43 form the drive unit 47 that drives the vibrating film 41, and the so-called internal magnet type speaker unit 49 is formed.

Reference numeral 51 in FIG. 1 is an acoustic braking member for adjusting acoustic impedance that closes the hollow portion 39a of the fitting 39 with the lower end surface in the drawing, and is highly breathable.

As shown in FIGS. 2 and 3, the speaker portion 49 has a case base 53 made of synthetic resin as a first case member and a front cover 55 made of synthetic resin as a second case member overlapped with each other. Together, it is stored and supported in the case body 57 that forms an internal storage space.

That is, the case base 53 has a circular outer edge and is formed into a flat hemisphere as a whole, and the front cover 55 has an outer edge that is substantially the same as the case base 53 and is formed as a flat overall.

As shown in FIG. 1, the case base 53 is integrated by being fitted inside the open tip of the front cover 55 so that the open tip sandwiches the flange 31 of the speaker portion 49 together with the front cover 55.

In the vicinity of the outer edge of the speaker portion 49 in the front cover 55, a sound communication cylinder 55a is formed on the outside and slightly obliquely upward in FIG. 1, thereby forming a sound communication hole 55b that communicates inside and outside the case body 57. Has been done. The sound from the vibrating membrane 41 is propagated from the sound passage hole 55b to the ear canal 59 in the user's ear, as shown in FIG.

In the front cover 55, the outer surface facing the vibrating membrane 41 forms a tragus contact surface 55c for contacting the tragus 63 facing the user's concha cavity 61.

Returning to FIG. 1, in the case base 53, a cylindrical support column 53a is projected from the side opposite to the sound communication cylinder 55a, that is, a position far from the sound communication cylinder 55a (see FIGS. 2 and 3). ). The support pillar 53a is formed in a positional relationship such that the virtual center line penetrates the paper surface of FIG. 1 and is orthogonal to each other, and is supported by the case base 53.

The cable 45 inserted from the outside into the support column 53a is introduced into the case base 53 from the middle of the support column 53a and connected to the circuit board 37.

As shown in FIG. 3, the case base 53 is formed with a projecting portion 53b on the back side of the yoke 29, which is erected outward in a fan shape and is bent in a semi-cylindrical shape to project. ..

The outer surface of the tip of the projecting portion 53b is a bead contact surface 53c for abutting the bead 65 facing the user's ear concha cavity 61.

In the case body 57, as shown in FIG. 4, the distance A between the position farthest from the tip of the sound passage hole 55b (sound communication cylinder 55a) of the projecting portion 53b and the sound communication hole 55b is, for example, It is selected from 14 mm to 24 mm, and the earphone device has dimensions suitable for the user's ear.

In the conventional intra-conker type speaker device shown in FIG. 7, the outer diameter of the case body 1 is generally set to about φ17 mm at the maximum.

On the other hand, in the speaker device of the present invention, as shown in FIG. 4, the tragus contact portion 53c and the tragus contact surface 55c are fixed between the tragus 63 and the tragus 65, so that, for example, the interval A There is no problem in terms of wearability and sound quality even if the size of is set to 19 mm.

Moreover, it is possible to maintain good wearability and sound quality by forming the sound transmission tube 55a into a shape like an elephant's nose and extending it toward the ear canal 59, or conversely making it shorter. Therefore, in the above configuration, it is preferable to set the value of the interval A to ± 5 mm.

Inside the tip of the projecting portion 53b, an elongated acoustic tube 67 is formed, which communicates with the inside of the case body 57 at one end side of the fan shape and communicates with the outside at the other end portion of the fan shape. Reference numeral 67a in FIGS. 3 and 4 is an opening leading from the acoustic tube 67 to the outside.

In order to form the acoustic tube 67, as shown in FIG. 1, a fan-shaped projecting portion 53b is formed in the case base 53 so as to form a narrow convex internal space 53d, while FIGS. 2 and 5 As shown in the above, the arc strip 69 formed separately from the case base 53 and along the arc of the projecting portion 53b is formed by hitting the convex internal space 53d inside the case base 53 to close it. It is possible to do.

FIG. 5 shows a cross section between V and V in FIG. 2, and the arc strip 69 is shown in a straight line for easy understanding. However, as can be understood from FIG. Actually, it is curved in an arc shape and is stored and fixed in the case base 53. Note that FIG. 5 schematically shows the speaker unit 49.

The acoustic tube 67 itself is formed inside the tip of the projecting portion 53b so as to be curved along the tip.

Further, in the case base 53, a braking hole 71 for acoustic braking that communicates with the case body 57 and the outside is formed at a position surrounded by the projecting portion 53b. The braking hole 71 is closed with an acoustic braking member 73 that adjusts the air permeability according to the required performance.

In such a speaker device, the drive unit 31 vibrates the vibrating film 41 by supplying an audio signal from the cable 45 via the circuit board 37 and applying the audio signal to the voice coil 43, and the sound passage hole 55b. The vibration sound is propagated to the outside.

Then, in the speaker device according to the present invention, as shown in FIG. 4, the tragus contact surface 55c is brought into contact with the user's tragus 63, and the protruding portion 53b (anti-ball contact portion 53c) is brought into contact with the tragus. The ear canal surrounded by the tragus 63, the pair of beads 65, and the tragus 75 on the half of the case body 57 on the side of the sound passage hole 55b so as to be brought into contact with the 65 and the sound communication hole 55b is slightly inserted into the ear canal 59. It is used by inserting it into the cavity 61.

One half of the case body 57, which is far from the sound passage hole 55b, protrudes from the concha cavity 61 to the outside.

It is considered that the work can be facilitated by picking up the support pillar 53a or the like for attaching / detaching the case body 57.

FIG. 6 is a frequency characteristic diagram showing the speaker device of the present invention described above and, for example, the conventional speaker device of FIG. 7.

In the configuration according to the speaker device of the present invention, as shown by the frequency characteristic shown by the solid line a in FIG. 6, good sound pressure characteristics are exhibited even in a particularly low sound range, and high quality sound reproduction is possible in a wide frequency band. It can be seen that the sound pressure characteristics are higher than those of the speaker device of. Further, the broken line b in FIG. 6 has the same characteristics when the acoustic tube 67 is closed in the configuration of FIG. This figure shows the low frequency reproduction capability of the acoustic tube 67.

In such a configuration according to the speaker device of the present invention, the sound passage hole 55b (sound communication cylinder 55a) of the case body 57 is fitted into the entrance of the user's ear canal 59, and the tragus contact surface 55c of the case body 57 is fitted. The case body 57 is brought into contact with the user's tragus 63, and the protruding portion 53b of the case body 57 is brought into contact with the user's tragus 65 as the anti-ball contact surface 53c, and is paired with the tragus contact surface 55c of the case body 57. Since the bead contact surface 53c is sandwiched between the tragus 63 and the tragus 65, there is an advantage that the shape and dimension of the case body 57 does not depend on the wearability, and the size and shape of the case body 57 for accommodating the speaker portion can be used. Regardless, it is easy to improve wearability.

That is, regardless of whether the outer diameter of the vibrating membrane 41 is small or large, the dimension between the tragus contact surface 55c and the tragus contact surface 53c of the case body 57 can be suppressed to a certain narrow range. , It is easy to secure stable holding of the case body 57.

Further, in the speaker device of the present invention, in the case main body 57, the distance between the position farthest from the sound passage hole 55b and the sound passage hole 55b of the projecting portion 53b is selected to be 14 mm to 24 mm. , The above-mentioned effect can be ensured even in the configuration of the earphone device.

Moreover, such dimensions can be set with an emphasis on wearability, regardless of the diameter of the case body 57.

The sound passage hole 55b of the case body 57 can be formed to be long and inserted into the ear canal 59, and sound leakage from the gap can be suppressed to maintain good bass reproduction. Is.

Further, since the braking hole 71 faces the concha cavity 61 side, it is possible to reduce sound leakage from the braking hole 71 as compared with the conventional speaker device, and there is less structural waste.

Moreover, in the speaker device of the present invention, it is easy to form a sound quality adjusting acoustic tube 67 having a predetermined length inside the projecting portion 53b by using the projecting portion 53b, and braking the vibration displacement of the vibrating film 41 is applied. The braking hole 71 to be added can also be easily formed in the case body 57.

As described above, in the speaker device of the present invention, the dimensions do not easily affect the wearability, and it is easy to secure the arrangement space for the acoustic tube 67 and the braking hole 71, and the inner diameter and the length of the acoustic tube 67 are appropriately adjusted. If the selection is made and the inner diameter of the braking hole 71 is also appropriately selected, it is easy to improve the wearability and obtain a high-quality reproduced sound.

Further, in the speaker device of the present invention, the configuration is not limited to the speaker portion 49 described above, but a disc-shaped vibrating film, a magnetic yoke supporting the disc-shaped vibrating membrane, and a voice coil fixed to the yoke side of the vibrating membrane. It is possible to carry out the configuration having a drive unit which is arranged in the yoke and displaces the voice coil by the applied voice signal to vibrate drive the diaphragm.

1,57 Case body 3,29 Yoke 5,33 Drive magnet 7,41 Vibrating membrane 9,43 Voice coil 11a Case base 11b Front cover 13,55b Sound passage hole 15, 45 Cable 17, 47 Drive unit 19, 63 Tragus 21,65 Pairs 23,75 Tragus 25,61 Ear canal 27,59 Ear canal 29a Cylindrical part 29b Bottom 31 Flange 35 Pole piece 37 Circuit board 39 Fastening 39a Hollow part 41a Central area 41b Outer region 49 Speaker Parts 51, 71, 73 Acoustic braking member 53 Case base (first case member: case body)
53a Support pillar 53b Protruding part 53c Anti-pearl contact surface 53d Internal space 55 Front cover (second case member: case body)
55a Sound transmission tube 55c Tragus contact surface 67 Acoustic tube 67a Aperture 69 Arc strip 71 Braking hole

Claims (4)

The voice coil is displaced by a disk-shaped vibrating membrane, a magnetic yoke supporting the vibrating membrane, a voice coil fixed to the yoke side of the vibrating membrane, and a voice signal arranged and applied to the yoke. A speaker unit having a drive unit that vibrates and drives the diaphragm,
The case body that stores and supports this speaker unit and
Equipped with
The case body is a sound passage hole formed through the vicinity of the outer edge of the speaker portion, and is a sound passage hole for propagating the sound produced by the speaker portion to the external auditory canal in the user's ear, and the vibration. An ear bead contact surface on the outer surface facing the membrane near the membrane for contacting the ear bead facing the user's concha cavity, and an ear bead contact surface on the back side of the yoke from the case body to the outside. A projecting portion that is erected in a fan shape and bent in a semi-cylindrical shape to form a pair of beads contact surface for contacting the pair of beads facing the ear canal cavity. An electro-sound conversion device characterized by having a unit and a unit. The electroacoustic conversion device according to claim 2, wherein in the case main body, the distance between the protruding portion farthest from the sound passage hole and the sound passage hole is selected to be 14 mm to 24 mm. The electricity according to claim 1 or 2, wherein an acoustic tube is formed inside the protruding tip of the projecting portion so as to communicate with the inside of the case body at one end side of the fan shape and to communicate with the outside at the other end portion of the fan shape. Acoustic converter. The electroacoustic conversion device according to any one of claims 1 to 3, wherein a braking hole for acoustic braking that communicates the inside and the outside of the case body is formed at a position surrounded by the protruding portion in the case body.

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