JP2011182201A - Earphone device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an earphone device with a configuration obtaining an superior effect, even in low-voice frequency characteristics, without a complicated configuration. <P>SOLUTION: The earphone device includes a housing 2 housing a driver unit 8 and a case 4 including a cavity communicating with the rear-side space 20 of the driver unit 8 in the housing 2. The case 4 is composed of a space 4C communicating with the rear-side space 20 of the driver unit and a space 4D including a voice discharger 4D1 communicating with the outside by a partition 9. The spaces 4C and 4D communicate through a duct 9B formed to the partition 9 and projected towards the space communicating with the rear-side space 20 of the driver unit. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an earphone used as an acoustic device, and more particularly to a mechanism for improving acoustic characteristics of a canal type earphone.

  Conventionally, in an earphone used as an acoustic device, as a method for improving acoustic characteristics, in particular, as a method for preventing the vibration from being hindered by back pressure generated when the diaphragm on the driver unit side vibrates, Some of the earphone housings have a hole, and an acoustic resistance material is further provided in the hole to adjust the acoustic characteristics. For example, the above-described conventional earphone is generally configured as shown in FIG.

  In FIG. 3, the housing 102 has a bowl-like shape, and a driver unit 103 is provided therein, and an opening 110 for emitting sound is formed on the front surface. The driver unit 103 generally has a yoke 104, and a disk-shaped pole piece 106 is mounted through a circular magnet 105 therein.

  A diaphragm 107 is attached to the surface facing the pole piece 106, and a voice coil 108 is attached to the diaphragm 107. The voice coil 108 is located in a magnetic gap formed between the yoke 104 and the pole piece 106. A hole 109 is provided on the back surface of the housing 102, and an acoustic resistance material 111 is provided on the inner surface of the hole 109.

  As a means for extending the low frequency limit frequency, as shown in FIG. 4, an earphone to which a bass compensation pipe 112 is added is known. The basic configuration is the same as the example shown in FIG. 3, and the bass compensation pipe 112 having a predetermined length and a predetermined diameter is communicated with the internal space of the housing 102 having the driver unit 103 so as to be integrated with the housing 102. It is provided. By doing so, the low frequency limit frequency in the diaphragm can be expanded by the action of the space of the bass compensation pipe 112.

  However, in such a configuration, the thickness of the diaphragm, the shape of the bass compensation pipe, and the internal volume are limited, and there is a limit to improving the acoustic characteristics.

Therefore, an earphone as shown in FIG. The earphone shown in FIG. 5 uses a configuration in which a first housing 201 and a second housing 202 communicate with each other via a connection path 203. The first housing 201 is provided with a driver unit 103 similar to that described in FIGS. 3 and 4. The second housing 202 is hollow and has the same function as the space of the bass compensation pipe 112 in the example shown in FIG. Furthermore, a bass compensation diaphragm 204 that functions as a bass compensation means is disposed in the internal space of the second housing 202. By configuring in this way, the earphone is intended to improve the low frequency characteristics without affecting the characteristics of the middle and high frequencies.
In addition, the earphone according to the invention described above is configured such that the first housing 201 can be inserted into the ear canal during use.

Japanese Patent No. 2644356

  However, according to the earphone as shown in FIG. 5 described in Patent Document 1, the vibration for low-frequency sound having an inertial mass sufficient to lower the low-frequency limit is provided in the second housing 202 used for low-frequency sound. It is necessary to provide a special plate. In such a diaphragm for securing low sound, its inertial mass affects the listening range in the low frequency range, but it cannot be increased unnecessarily because the sensitivity changes due to the mass, that is, it becomes difficult to listen to the reproduced sound. Therefore, not only is there a limit to the low frequency range, but the configuration is complicated because a special configuration is required to improve the low frequency range reproduction.

  Moreover, the diaphragm 204 for low-frequency sound guarantees to receive the sound wave propagating from the driver unit 103 on the first housing 201 side and vibrates itself by so-called damming, so that the diaphragm of the driver unit 103 Since a sound having a frequency lower than the lowest resonance frequency is obtained, the mass needs to be increased accordingly. For this reason, it is necessary to strengthen the support structure, and there is a difficulty in increasing the size. The diaphragm 103 is generally an organic thin film made of polyethylene terephthalate or the like, and the low-frequency sound-proof diaphragm 204 is made of metal, so that the difference in mass between the two is large. Therefore, since the diaphragm for soundproofing 204 receives the back pressure of the diaphragm 103 when actually vibrating, it is extremely difficult to vibrate the diaphragm for soundproofing 204 as calculated in the design. Actually, it can be said that the diaphragm 204 for ensuring low sound becomes a simple acoustic resistance. Further, it is difficult to adjust the acoustic characteristics by coexisting the diaphragm 103 and the diaphragm 204 for ensuring low sound.

  The earphone described in Patent Document 1 as shown in FIG. 5 seems to adopt the technical idea of the drone cone type speaker. A drone cone type speaker has a diaphragm having a diaphragm having almost the same diameter as the diaphragm of the above speaker unit, but a so-called dummy unit having no magnetic circuit or voice coil attached to the enclosure to which the speaker unit is mounted. . The diaphragm of the dummy unit vibrates due to the back pressure generated by the vibration of the diaphragm of the speaker unit, and the sound pressure level in the low frequency range is increased by radiating sound waves generated by this vibration. It is the target. The drone cone type speaker is effective because sound waves are emitted from the dummy unit together with sound waves from the speaker unit, and even if a dummy diaphragm as shown in FIG. Sound waves from the dummy diaphragm do not enter the user's ears, and the effect of a drone cone type speaker cannot be expected.

  An object of the present invention is to solve the technical problem of the conventional earphone described above, that is, to provide an earphone having a configuration that can obtain a good effect even in a bass frequency characteristic without a complicated configuration. It is said.

  An earphone according to the present invention includes a housing that houses a driver unit, and a housing portion that has a hollow portion that communicates with a space on the back side of the driver unit in the housing, and the hollow portion of the housing portion includes a partition portion. Is partitioned into a space communicating with the driver unit back side space and a space provided with a hole communicating with the outside, and the spaces of the housing portion communicate with each other via a duct portion provided in the partition portion. It is the most important feature.

According to the earphone according to the present invention, the housing portion having a hollow portion communicating with the driver unit back side space in the housing accommodating the driver unit is provided, and the duct portion is provided at a position where the inside of the housing portion is partitioned. Since it is provided, the sound wave from the back side of the driver unit passes through the inside of the duct part in a state of detouring from the sound emitting direction and reaches the outside.
As a result, the back pressure generated on the back side of the diaphragm of the driver unit reaches the space in the housing, the housing space is hollow, and the capacity is large, so the back pressure is reduced. Furthermore, since air is released through a hole communicating with the outside, the back pressure can be further reduced. The back pressure is reduced, the vibration of the diaphragm is facilitated, and the low sound can be ensured. In addition, the sound wave generated on the back side of the diaphragm is subjected to acoustic resistance due to the presence of the duct portion until the sound wave passes through the inside of the casing and reaches the outside, and acoustic characteristics corresponding to the acoustic resistance can be obtained.
As a result, the response of the low frequency range is improved without using special inertia mass members, etc., and a rich reproduction sound can be obtained without causing a bulky sound. Therefore, it is possible to obtain an effect that the acoustic characteristics can be easily adjusted.

1 is an external perspective view showing an embodiment of an earphone according to the present invention. It is sectional drawing which follows the line (2)-(2) in FIG. It is a longitudinal cross-sectional view which shows the example of the conventional earphone. It is a longitudinal cross-sectional view which shows the other example of the conventional earphone. It is a longitudinal cross-sectional view which shows another example of the conventional earphone.

Hereinafter, embodiments of an earphone according to the present invention will be described with reference to the drawings.
In FIG. 1, an earphone 1 includes a housing 2, a housing 4, and a sound emission tube 3 and an earpiece 5 communicating with the housing 2 as main components. In FIG. 1, reference numeral 6 indicates a lead portion of the lead wire 7.

  As shown in FIG. 2, the housing 2 is a bowl-shaped member in which a space is formed by fitting the opposing edges of the peripheral wall portions 2 </ b> A and 2 </ b> B configured in a split shape into each other. As shown in FIG. 2, the driver unit 8 is accommodated. The sound emitting tube 3 is a tubular portion that communicates in a state of projecting from the housing 2 toward the user's external auditory canal (not shown), and in the vicinity of the tip thereof, as shown in FIG. An annular convex portion 3A is formed so that the earpiece 5 fitted in the sound emission tube 3 can be held so as not to fall off.

  The earpiece 5 has a cylindrical member in which a concave groove (not shown) that fits in the annular convex portion 3A on the sound emitting tube 3 side is formed inside, and a hemispherical shape that is folded from the tip of the cylindrical member. It consists of a large ear hole insertion part. When this ear hole insertion portion is inserted into the ear canal, it closely contacts the inner surface of the ear canal to reduce sound leakage and to reduce the low frequency reproduction ability due to sound leakage.

  As shown in FIG. 2, the casing 4 is a member integrated with the housing 2 so as to be carried on the back of the housing 2, and has a cavity communicating with the driver unit back side space 20 in the housing 2. Have. The configuration related to the casing 4 will be described in detail later as a feature of the present invention.

  The base part of the lead lead-out part 6 is connected to the casing part 4, and the lead lead-out part 6 is arranged at the outer periphery of the lower part of the casing part 1 so that it fits into the notch between the user's ears when using the earphone 1. It protrudes in a rod shape toward the notch between the beads. The inside of the lead lead-out portion 6 is a hollow portion for inserting the lead wire 7, and the lead wire 7 inserted through the hollow portion is connected to an external acoustic device, so that an audio signal is sent to the driver unit 8. It is designed to be entered.

  A characteristic configuration of the present invention as described below is added to the configuration of the earphone 1 as described above. The feature of the present invention resides in the configuration of the casing 4. Specifically, the volume of the space communicating with the driver unit back side space 20 of the housing 2 is expanded to suppress the influence of the back pressure in the driver unit back side space 20, and the driver unit back side space 20 is communicated. In other words, the space partitioned by partitioning the spaces to be communicated with each other by the duct portion 9B.

  In FIG. 2, the housing part 4 is constituted by outer parts 4 </ b> A and 4 </ b> B having a split structure, and a partition part 9 sandwiched and integrated by these outer parts 4 </ b> A and 4 </ b> B. The partition portion 9 includes a duct portion 9B described in detail later.

  The housing part 4 has a hollow part communicating with the driver unit back side space 20 of the housing 2 in the peripheral wall 2B on the back side of the housing 2 inside, and the hollow part is separated by the partition part 9 into the above driver. The space is divided into a space 4C communicating with the unit back side space 20 and a space 4D communicating with the outside. Thereby, a duct portion 9B described later is formed by a partition portion 9 which is a separate member from the outer portions 4A and 4B of the housing portion 4, and is externally connected to the space 4C communicating with the driver unit back side space 20 of the housing 2. It is assembled | attached between the space 4D which can communicate. The partition portion 9 is integrally formed with the peripheral wall 2B on the back side of the housing 2. A part of the outer portions 4A and 4B bite into a part of the peripheral wall 2B. The space 4 </ b> C in the housing 4 communicates with the driver unit back side space 20 on the housing 2 side through an opening 9 </ b> A formed in the partition 9. By comprising in this way, since the housing | casing part 4 can be easily assembled by the partition part 9 which is a member different from outer shell part 4A, 4B, it is possible to reduce the man-hour at the time of an assembly. Moreover, since the housing | casing part 4 can be comprised with few members, the earphone concerning this invention has the merit which can aim at cost reduction and can be manufactured cheaply.

  The spaces 4C and 4D of the housing part 4 are partitioned by the partition part 9 as described above, but are communicated by a duct part 9B provided in the partition part 9. The duct portion 9 </ b> B is configured by a hollow portion that protrudes from the partition portion 9 toward the space 4 </ b> C side that communicates with the driver unit back side space 20 on the housing 2 side.

  The protruding direction of the duct portion 9B is a direction perpendicular to the direction of the back pressure from the driver unit back side space 20 of the housing 2 (vertical direction in FIG. 2), and the leading end of the protruding direction is the back side of the driver unit of the housing 2 As a communicating part with the space 20, it projects to the position crossing the opening 9 </ b> A formed in the partition part 9.

  In order to use the duct portion 9 as a hollow member, a hole 9B1 along the protruding direction is formed inside. As the cross-sectional shape of the hole 9B1, a circular shape, a rectangular shape, or the like can be selected. The cross-sectional shape along the protruding direction of the duct portion 9 is a cylindrical shape having the same inner diameter in the illustrated embodiment, but may be a horn shape. Such a cross-sectional shape of the hole 9A1 is selected according to the setting of the acoustic characteristics. Further, the size of the hole 9A1, the protruding amount, the distance to the tip in the protruding direction, and the like are appropriately set according to the acoustic characteristics to be obtained.

  On the other hand, in the space 4D that can communicate with the outside in the space inside the housing part 4, at least one hole 4D1 parallel to the penetration direction of the hole 9B1 formed in the duct part 9B is provided. The hole 4D1 functions to release the pressure generated on the back side of the diaphragm, that is, the back pressure, by driving the driver unit 8 to the outside and prevent the vibration of the diaphragm from being suppressed by the back pressure. The space 4C in the casing 4 is a space where the duct portion 9B exists, and the space 4B is a space communicating with the outside and a volume expansion space.

  In this embodiment, the space 4D provided with the hole 4D1 serving as a communication portion with the outside has a shape as a volume expanding portion, that is, a shape bulging out on the opposite side to the one side of the outer portion, while the driver unit rear side space A space 4 </ b> C communicating with 20 is a low-frequency reproducible region using the duct portion 9 </ b> B. When the earphone is in use, the outer portion 4A constituting the space 4C is a front surface, that is, a surface substantially parallel to the user's face, and this surface is formed in a shape close to a flat surface that does not bulge the outer surface. The front surface of the outer portion 4A can be used as a design surface, and an advertising effect can be obtained by applying an image, engraving, or a trademark.

  In the present embodiment, the above-described configuration includes the housing portion 4 having a space capable of expanding the volume at a position communicating with the driver unit back side space 20 of the housing 2. The partition portion 9 partitions the space 4C communicating with the driver unit back side space 20 and the space 4D communicating with the outside, and the spaces 4C and 4D communicate with each other via the duct portion 9B.

  In each of the spaces 4C and 4D, a space 4C communicating with the driver unit back surface side space 20 is provided with a duct portion 9B that protrudes in a direction perpendicular to the traveling direction of the back pressure from the driver unit back surface space 20. For this reason, the back pressure from the driver unit back side space 20 hits the outer peripheral surface of the duct portion 9B, passes through the hole 9B1 of the duct portion 9B, reaches the space 4D, and further communicates with the outside. To the outside through the hole 4D1.

  Thus, the back pressure generated in the driver unit back side space 20 advances while bypassing the propagation path due to the presence of the duct portion 9B. Since the duct portion 9B is positioned in the propagation path of the back pressure, the labyrinth (maze) effect is given to the propagation path as shown by the dashed line arrow in FIG. Resistance will be given. As a result, the back pressure is released without providing a special inertia mass member or a structure for blocking the propagation of the back pressure in the housing section 4, and the acoustic characteristics of the low frequency range are increased by expanding the volume on the housing section 4 side. Can be improved. In addition to this, low-frequency reproduction without distortion can be realized by removing sound waves to the outside while providing acoustic resistance characteristics using the duct portion 9B.

  In addition, it is also possible to affix an acoustic resistance substance on the inner surface of the hole 4D1 provided in the communication portion with the outside to improve acoustic characteristics. Moreover, you may provide an acoustic resistance substance in the appropriate position of hole 9B1 of the duct part 9B.

  The present invention is not limited to the configuration described in the embodiments described above, and can be appropriately changed in design without departing from the technical idea described in the claims. For example, the technical idea of the present invention can be applied to hearing aids, headsets, and the like.

DESCRIPTION OF SYMBOLS 1 Earphone 2 Housing 20 Driver unit back side space 4 Housing | casing part 4A, 4B Outer part 4C Space which communicates with driver unit back side space 4D Space which can communicate with the outside 4D1 Hole which communicates with the outside 8 Driver unit 9 Partition part 9A Driver Opening for communication with unit rear side space 9B Duct section 9B1 hole

Therefore, an earphone as shown in FIG. The earphone shown in FIG. 5 uses a configuration in which a first housing 201 and a second housing 202 communicate with each other via a connection path 203. The first housing 201 is provided with a driver unit 103 similar to that described in FIGS. 3 and 4 . Bass compensation diaphragm 204 that functions as the bass compensation means in the inner space of the second housing 202 are disposed of, et al. By configuring in this way, the earphone is intended to improve the low frequency characteristics without affecting the characteristics of the middle and high frequencies.
In addition, the earphone according to the invention described above is configured such that the first housing 201 can be inserted into the ear canal during use.

However, according to the earphone as shown in FIG. 5 of Patent Document 1, in the second housing 202 for use in the bass compensation, for low compensating with inertial mass sufficient to lower the bass limit frequency vibrations It is necessary to provide the plate 204 specially. Such a bass compensating diaphragm 204 has its own inertial mass affecting the listening range in the low frequency range, but cannot be increased unnecessarily due to sensitivity changes due to the mass, that is, it becomes difficult to listen to the reproduced sound. . Therefore, not only is there a limit to the low frequency range, but the configuration is complicated because a special configuration is required to improve the low frequency range reproduction.

Further, the bass compensation diaphragm 204 reliably receives sound waves propagating from the driver unit 103 on the first housing 201 side and vibrates itself by so-called damming, so that the diaphragm of the driver unit 103 Since a sound having a frequency lower than the lowest resonance frequency is obtained, the mass needs to be increased accordingly. For this reason, it is necessary to strengthen the support structure, and there is a difficulty in increasing the size. The diaphragm 103 is generally an organic thin film made of polyethylene terephthalate or the like, and the bass compensating diaphragm 204 is made of metal, so that the difference in mass between the two is large. Therefore, since the bass compensating diaphragm 204 receives the back pressure of the diaphragm 103 when actually vibrating, it is extremely difficult to vibrate the bass compensating diaphragm 204 as calculated in the design. Actually, it seems that the bass compensating diaphragm 204 becomes a simple acoustic resistance. Furthermore, it is difficult to adjust the acoustic characteristics by coexisting the diaphragm 103 and the bass compensating diaphragm 204.

According to the earphone according to the present invention, the housing portion having a hollow portion communicating with the driver unit back side space in the housing accommodating the driver unit is provided, and the duct portion is provided at a position where the inside of the housing portion is partitioned. Since it is provided, the sound wave from the back side of the driver unit passes through the inside of the duct part in a state of detouring from the sound emitting direction and reaches the outside.
As a result, the back pressure generated on the back side of the diaphragm of the driver unit reaches the space in the housing, the housing space is hollow, and the capacity is large, so the back pressure is reduced. Furthermore, since air is released through a hole communicating with the outside, the back pressure can be further reduced. Back pressure is reduced, vibration of the diaphragm is facilitated, and bass compensation is possible. In addition, the sound wave generated on the back side of the diaphragm is subjected to acoustic resistance due to the presence of the duct portion until the sound wave passes through the inside of the casing and reaches the outside, and acoustic characteristics corresponding to the acoustic resistance can be obtained.
As a result, the response of the low frequency range is improved without using special inertia mass members, etc., and a rich reproduction sound can be obtained without causing a bulky sound. Therefore, it is possible to obtain an effect that the acoustic characteristics can be easily adjusted.

An earphone according to the present invention includes a housing that houses a driver unit, and a housing portion that has a hollow portion that communicates with a space on the back side of the driver unit in the housing, and the hollow portion of the housing portion includes a partition portion. Accordingly, a first space communicating with the driver unit back side space, partitioned into the second space having a hole communicating with the outside, the first space and the second space of the housing portion communicates by a duct portion provided in the partition portion, the back pressure from the driver unit back side space, said housing part said the first space second through the duct portion It reached space, and most important feature Rukoto escape to the outside from the second space through the hole communicating with the outside.

To the duct portion 9 B a hollow member, the interior hole 9B1 is formed along the projecting direction. As the cross-sectional shape of the hole 9B1, a circular shape, a rectangular shape, or the like can be selected. Sectional shape along the protruding direction of the duct portion 9 B is has a cylindrical shape with the same inner diameter in the illustrated embodiment, may be the horn shape. Such a cross-sectional shape of the hole 9B1 is selected according to the setting of the acoustic characteristics. Further, the size of the hole 9 B 1, the protruding amount, the distance to the tip in the protruding direction, and the like are appropriately set according to the required acoustic characteristics.

An earphone according to the present invention includes a housing that houses a driver unit, and a housing portion that has a hollow portion that communicates with a space on the back side of the driver unit in the housing, and the hollow portion of the housing portion includes a partition portion. Is partitioned into a first space communicating with the driver unit back side space and a second space having a hole communicating with the outside, and the first space and the second space of the housing portion are The duct portion is communicated by a duct portion provided in the partition portion, and the duct portion protrudes toward the first space in a direction perpendicular to the sound emitting direction from the driver unit rear side space, and its tip but flared position across the communicating portion between the housing and the first space, the back pressure from the driver unit back side space, the duct from the first space of the housing portion It passes through reached the second space, through the hole communicating with the outside and the most important feature to escape to the outside from the second space.

Claims (9)

A housing for housing the driver unit;
A housing portion having a hollow portion communicating with the space on the back side of the driver unit in the housing,
The hollow portion of the casing is partitioned by a partition into a space having a space communicating with the driver unit back side space and a space communicating with the outside.
Each of the spaces of the housing part communicates with each other via a duct part provided in the partition part.   The earphone according to claim 1, wherein the duct portion protrudes in a direction perpendicular to a direction of back pressure from the driver unit rear side space.   The earphone according to claim 1, wherein the duct portion projects toward a space communicating with the driver unit rear side space.   4. The duct portion according to claim 1, wherein a tip projecting toward a space communicating with the driver unit rear side space protrudes at a position crossing the communicating portion with the housing. Earphone as described in.   The earphone according to claim 1, wherein the duct portion has a cylindrical shape.   The earphone according to claim 1, wherein the duct portion is integrally formed with a partition portion of the housing portion and a rear member of the housing.   The said housing | casing part is comprised in two outer parts of a split type structure, and the partition part by which these outer parts are located in both sides and each outer part was engage | inserted in any one of Claim 1 thru | or 6 The listed earphone.   8. The earphone according to claim 7, wherein one of the two outer portions has an outer surface as a front surface when used, and the front surface can be used as a design surface. 9.   The earphone according to claim 7, wherein the other of the two outer portions is formed in a shape bulging on the opposite side of the outer portion and has a hole communicating with the outside.

Images