JP2015106725A - Behind-the-ear hearing aid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a behind-the-ear hearing aid which can obtain directional characteristics by a plurality of microphones and which is provided with a ventilation passage which is scarcely blocked by water.SOLUTION: A behind-the-ear hearing aid 1 has: two microphone sound ports 16, 18 formed on an outer surface of a main unit 3; a second vent hole 20 formed between the microphone sound ports 16, 18; and a microphone cover 4 attached to the main unit 3 while covering the microphone sound ports 16, 18 and the second vent hole 20. When the microphone cover 4 is attached, an internal space is formed between the microphone cover 4 and the main unit 3, and the internal space is divided into three subdivided spaces by a partition 24. The three subdivided spaces are individually communicated with the microphone sound ports 16, 18 and the second vent hole 20 respectively. A ventilation passage is formed, between the microphone cover 4 and the main unit 3, of a first groove portion 30 and a second groove portion 28.

Description

  The present invention relates to a behind-the-ear hearing aid that can obtain directional characteristics with a plurality of microphones.

  Generally, air batteries are often used as the power source for hearing aids. However, when the hearing aids are required to be waterproof, it is necessary to prevent the intrusion of water into the hearing aids while supplying sufficient air to the air batteries. There is. For this reason, conventionally, various attempts have been made in ear-mounted hearing aids from the viewpoint of how to ensure air permeability while maintaining waterproofness.

  For example, there is an ear-type hearing aid that forms a groove in the inner wall surface of the battery holder, has an air hole in the lowermost part of the battery holder during wearing, and facilitates the discharge of water droplets from the battery holder to ensure ventilation (for example, , See Patent Document 1). In addition, there are many hearing aids that make it difficult for water droplets to stay by performing water-repellent finishing on the entire surface (see, for example, Patent Document 2). In addition to this, a hearing aid having a structure in which a vent hole is provided at a lower position when the hearing aid is worn, and the vent hole is closed with a material formed of a water-repellent material in a porous fiber is known (for example, (See Patent Document 3).

Japanese Patent Laid-Open No. 9-215098 Special table 2003-519938 gazette Japanese Patent Laid-Open No. 7-222294

  However, even in a hearing aid having a structure (Patent Documents 1 and 2) that takes into consideration the intrusion of water into the vent hole, if dirt or the like adheres during the wearing process, the effect of the water repellent treatment on the surface of the hearing aid is weakened. In this case, there is a problem that the vent hole is blocked with water droplets such as water and sweat, and as a result, the hearing aid does not operate.

  The above is a problem when only one ventilation hole is used. However, in the case of a non-directional hearing aid having only one microphone (Patent Document 3), it is difficult to be blocked by a scalp or an ear during wearing. It is easy to provide another vent. As a result, even if it is inevitable that the size of the hearing aid will increase somewhat, even if one vent hole is blocked, air can be supplied from another vent hole, so that the operation of the hearing aid can be maintained. It is expected to be.

  However, in the case of a hearing aid that obtains directional characteristics with a plurality of microphones (particularly ear-hearing type hearing aids), the story is not so simple. This is because there are not a few restrictions on the placement of microphones in order to fully exhibit the directivity characteristics.

That is, in the ear-mounted hearing aid having directivity, a plurality of microphones are arranged on the surface opposite to the surface facing the back side of the pinna when worn, that is, the surface facing outward when worn. When a cover for waterproofing is attached to this microphone, it is difficult to obtain directional characteristics if the space before the sound entrance to each microphone is connected without being partitioned. It is necessary to provide appropriate partitions in the space. Further, in order to easily obtain a phase difference or a time difference when picking up sounds generated in the vicinity, it is desirable to arrange the microphones with appropriate intervals. In consideration of these, it is necessary to take measures for waterproofing.
Thus, in order to ensure both waterproofness and air permeability in the ear-mounted hearing aid having directivity, it is necessary to provide a vent hole while satisfying these restrictions.

  Accordingly, an object of the present invention is to provide an ear-hearing type hearing aid that can ensure waterproofness and air permeability while exhibiting directional characteristics with a plurality of microphones.

In order to solve the above problems, the present invention employs the following solutions.
That is, the present invention includes a main body that accommodates a plurality of microphones therein, and a first air hole (first air hole) is formed in the battery holder of the main body. In addition, the 1st ventilation hole may be formed in the site | part located below in the wearing state of a main body. In addition, a plurality of microphone sound openings for individually inputting sound to a plurality of microphones are opened on a surface (for example, “upper surface”, hereinafter the same) in the worn state of the outer surface of the main body. Is formed. Note that at least two (plural) microphones are required to exhibit directivity. A second vent hole (second vent hole) is formed on the upper surface so as to ensure air permeability between the inside and the outside of the main body. A cover member is attached to the main body, and the cover member covers the plurality of microphone sound ports and the second vent hole. In addition, the cover member forms an internal space between the cover member and the upper surface when the cover member is attached to the main body. A partition member is provided between the upper surface and the cover member. The partition member divides the internal space into individual subspaces that communicate with the plurality of microphone sound ports and the second ventilation hole. The cover member is formed with a plurality of sound intakes. These sound intakes individually open a plurality of subdivided spaces communicating with the plurality of microphone sound openings to the outside air when the cover member is attached to the main body. Along with the attachment of the cover member, a ventilation path is formed between the main body and the cover member for allowing the sub-space and the outside air to communicate with the second ventilation hole when the cover member is attached to the main body.

  As described above, the present invention forms the plurality of microphone sound ports and the second vent holes on the upper surface (the surface along the front-rear direction) of the main body, thereby realizing the directional characteristics by the plurality of microphones and the air to the air battery. It is intended to supply. However, these openings are not simply formed on the upper surface of the main body, but an internal space is formed by covering a plurality of microphone sound ports and second vent holes with a cover member, and the internal space is partitioned by a partition member. Thus, a plurality of subspaces communicating with each opening are formed, and each subspace is opened to the outside air by a sound inlet. Thereby, since the space (subdivision space) used as the entrance of the sound with respect to several microphones is partitioned appropriately, directivity can be exhibited without a problem. On the other hand, with the cover member attached to the main body, a sufficient air can be supplied to the inside of the main body through the second ventilation hole by forming a ventilation path therebetween. Since the second vent hole is covered with the cover member, there is no fear of clogging due to adhesion of dirt or the like.

  Even if the first vent hole that is not covered by the cover member is blocked by adhesion of dirt or the like, the second vent hole covered by the cover member and the vent path thereof have good air permeability. Demonstrate. Conversely, even when the second ventilation hole and the ventilation path are blocked, the first ventilation hole located below is less susceptible to water ingress and is less likely to be blocked. it can. Thereby, sufficient air can be supplied to the air battery, and the operation of the hearing aid can be continued.

  In the present invention, it is preferable that the partition member divides a plurality of subspaces communicating with the plurality of microphone sound ports into volumes of the same degree, and these subspaces are separated from the ventilation path by the inner wall of the cover member. According to this aspect, the sound can be picked up satisfactorily while suppressing the influence on the acoustic surface due to the difference in the space volume serving as the sound entrance to each microphone.

  The microphone sound ports are preferably formed at two locations on the upper surface of the main body at a predetermined interval, and the second vent hole is preferably located between the two microphone sound ports.

  Here, it is only necessary that the second ventilation hole is provided at a position where it is not easily blocked by hair or the like, and if the size of the entire hearing aid is not questioned, the ventilation hole can be provided at any position on the outer surface of the main body. It is possible to take However, in that case, if the second ventilation hole is provided at a convenient position, it is inevitable that the entire hearing aid becomes larger.

  In this regard, according to the above-described aspect, in order to make it easy to obtain the directivity characteristics of the microphones by arranging the two microphones at a certain distance, the space located around the middle of the two microphones is used. Necessary ventilation holes can be provided without increasing the overall size of the hearing aid.

  Preferably, the cover member is attached in a state of being fitted to a part of the main body. In this case, the ventilation path may include a first groove, an outside air inlet, and a second groove. Among these, the 1st groove part is formed in a main body along the seam of a main body and a cover member, and the air permeability to the direction along a seam is ensured in the attachment state of the cover member to a main body. Further, the outside air advance inlet allows the first groove portion to communicate with the outside air in a state where the cover member is attached to the main body. And the 2nd groove part mutually connects the subdivision space and 1st groove part which lead to the 2nd ventilation hole in the attachment state of the cover member to a main part.

  If it is said aspect, ventilation will be made | formed along the seam (outside air entrance and 1st groove part) of a cover member and a main body with respect to the subdivision space which leads to a ventilation hole inside a cover member (internal space). Therefore, it is not necessary to provide an opening for ventilation in the cover member separately. Thereby, there is no fear that the air enters the inside of the cover member or the opening is blocked during wearing, and the air permeability is obstructed, and good air permeability can be ensured through long-term wearing.

  More preferably, the outer surface of the main body is water-repellent, and when the cover member is attached to the main body, water penetration into the joint between the main body and the cover member is suppressed by the water repellency of the outer surface. Shall. The cover member may also be subjected to water repellent processing.

  Thereby, while forming a wide ventilation path along the joint between the cover member and the main body, it is possible to block the intrusion of water from there and to exhibit good waterproofness and air permeability.

In the present invention, it is assumed that the plurality of sound intake ports are opened in a direction intersecting with the direction in which the plurality of microphone sound ports are opened on the upper surface of the main body through the subspace.
In this case, for example, even if hair or the like enters from the sound inlet, the tip cannot easily reach the microphone sound port, so that the microphone can be structurally protected.

Furthermore, the present invention may further include a waterproof porous membrane that is attached to the upper surface of the main body and closes the openings of the plurality of microphone sound ports and the second vent holes covered with the cover member.
In this case, in addition to waterproofing by the cover member (waterproofing by water repellency when the main body is water-repellent), water penetration into the main body is strongly blocked by the waterproofness by the porous membrane. be able to. In addition, if the structure protects against the entry of hair or the like as described above, the porous membrane can be prevented from being damaged by the contact of the hair or the like, and the durability can be enhanced.

  As described above, according to the behind-the-ear hearing aid of the present invention, it is possible to realize a structure in which the vent hole is not easily blocked by water droplets such as sweat and water while obtaining directivity characteristics with a plurality of microphones. As a result, the supply of air to the air battery can be maintained, and the ear-mounted hearing aid can be continuously operated.

It is a perspective view at the time of seeing the ear-hook type hearing aid of one Embodiment from the battery holder side. FIG. 4 is a perspective view of a part of the microphone cover in a cross-sectional view of the ear-hearing type hearing aid according to the embodiment, with the microphone cover covered and removed from the earphone connector side. It is a top view of the main body which made a cross section a part of microphone cover. It is the perspective view which looked at the microphone cover from the back side. FIG. 5 is a longitudinal sectional view (end view taken along line V-V in FIG. 3) schematically showing a structure inside the microphone cover in a state where the microphone cover is attached to the main body. FIG. 6 is a lateral end view (end view taken along line VI-VI in FIG. 3) of the partition member viewed with the microphone cover attached to the main body. FIG. 5 is a lateral end view (end view taken along line VII-VII in FIG. 3) of the second ventilation hole when the microphone cover is attached to the main body. FIG. 5 is a lateral end view (end view taken along line VIII-VIII in FIG. 3) of the front microphone sound port in a state where the microphone cover is attached to the main body. It is the figure which showed typically the ventilation path | route formed with a 1st groove part, a 2nd groove part, and a microphone cover inner wall.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the ear-mounted hearing aid shown in the following embodiment is a preferable example, and the present invention is not limited to this example.

  FIG. 1 is a perspective view of an embodiment of a hearing aid 1 according to an embodiment viewed from an oblique rear side. As shown in FIG. 1, the ear-mounted hearing aid 1 mainly includes an earphone 2 and a main body 3, and the earphone 2 is connected to the main body 3 via an earphone connector 5. The ear-mounted hearing aid 1 according to one embodiment is worn with the main body 3 placed on the ear. At the time of wearing, the main body 3 is in a state of being sandwiched between the auricle and the scalp.

  The main body 3 is a casing made of, for example, a hollow resin molded product, and includes two microphones (a front microphone and a rear microphone), an electronic component including a signal processing IC and an air battery (both not shown). Is housed. Moreover, the lower end part of the main body 3 seen in the wearing state is formed as the battery holder 6, and the battery holder 6 is connected to the main body 3 via a hinge (no reference numeral). Although not specifically shown here, when the battery holder 6 is opened, the air battery accommodated therein is exposed.

  In order to maintain the airtightness of the inside of the main body 3, an O-ring (not shown) is attached to the earphone connector 5. Further, a packing is attached to the periphery of the battery holder 6, and the sealing performance of the main body 3 is ensured with the battery holder 6 closed. In addition, the main body 3 and the microphone cover 4 are water-repellent, and can sufficiently withstand a certain amount of water such as sweat or water due to daily use in a general environment. Note that how the ear-mounted hearing aid 1 avoids the intrusion of water droplets into the main body 3 will be described later.

  A first ventilation hole 8 is formed in a portion occupied by the battery holder 6 in the outer surface of the main body 3, and the first ventilation hole 8 is closed by a waterproof porous membrane. Since the first vent hole 8 is located below the main body 3 in the wearing state of the ear-hearing type hearing aid 1, the hole is not easily blocked by sweat or the like. It is possible to efficiently prevent water droplets from entering the battery holder 6 (main body 3) from the vent hole 8.

  As described above, when the user wears the ear-mounted hearing aid 1 on the ear, the battery holder 6 is positioned below. Further, a surface (hereinafter referred to as “upper surface”) along the front-rear direction in the worn state of the outer surface of the main body 3 is covered with the microphone cover 4. Inside the microphone cover 4, a microphone sound port that communicates with the microphone (not shown) is formed. The microphone sound outlet will be described later.

  The main body 3 is provided with a mode switching button 10 on the upper surface thereof. The mode switching button 10 protrudes through a circular opening formed at one end of the microphone cover 4 as viewed in the longitudinal direction. The mode switching button 10 is a button for switching a program for controlling the operation of the ear-hearing type hearing aid 1. For example, the mode switching button 10 is used to switch the directivity of the ear-mounted hearing aid 1 on / off, switch to the telecoil mode, or the like.

  When viewed from the wearing state, the side of the main body 3, that is, the side faces the user's auricle or scalp. On the side surface of the microphone cover 4 that is connected to the side surface through a gap, a front sound inlet 12 that communicates with the front microphone and a rear sound inlet 14 that communicates with the rear microphone are formed on each side. The microphone cover 4 is detachably attached in a state of being fitted to a part of the main body 3, and when the microphone cover 4 is removed, a part of the main body 3 (the upper part of the main body (not shown)) covered by the microphone cover 4 is exposed. Two microphones (not shown in FIG. 1) are provided on the upper part of the main body as described above. When the microphone cover 4 is attached, the outer surface of the main body 3 (upper part of the main body) and the microphone cover 4 A space (internal space) is formed between them.

  FIG. 2 is a cross-sectional view of a part of the microphone cover 4 in the ear-hook type hearing aid 1 according to the embodiment, and shows the state in which the microphone cover 4 is covered and removed from the body 3 as viewed from the earphone connector 5 side. FIG.

  As described above, the upper part 3t of the main body covered with the microphone cover 4 is provided with sound input ports for the two microphones, that is, the front microphone sound port 18 and the rear microphone sound port 16. A second ventilation hole 20 is formed at a position substantially in the middle of the microphone sound ports 16 and 18. The rear and front microphone sound ports 16 and 18 and the second vent hole 20 are all formed to open on the upper surface of the main body 3. Further, the rear and front microphone sound ports 16 and 18 and the second vent hole 20 are closed with a filter 22 in order to prevent water droplets and dust from entering. The form of the filter 22 will be described in more detail later.

  Note that the sound generated in front of the user when wearing the ear-hearing type hearing aid 1 reaches the front microphone first, and reaches the rear microphone a little later. On the contrary, the sound generated in the rear reaches the rear microphone first, and arrives at the front microphone a little later. By using such time difference and phase difference that occur at the time of sound collection, for example, by emphasizing the front sound, which is most important for hearing aids, and suppressing the sound generated behind, Directional characteristics can be obtained.

  As described above, by covering the main body upper portion 3t with the microphone cover 4, an internal space is formed between the main body upper portion 3t and the microphone cover 4. This internal space is divided into three spaces by a partition (partition member) 24. Specifically, the partition 24 partitions the internal space at two locations between the front microphone sound port 18 and the second vent hole 20 and between the rear microphone sound port 16 and the second vent hole 20. Two spaces are formed. The partition 24 will be further described later.

  In addition, since the acoustic surface is affected if the volume of the space leading to each microphone is different, the space where the front microphone sound port 18 is present and the space where the rear microphone sound port 16 is present have substantially the same volume (same as above). It is desirable to be partitioned so that

  Further, a first groove 30 is formed in the main body upper portion 3t along a base end portion (a boundary between a portion of the side surface of the main body 3 covered with the microphone cover 4 and a portion not covered). In addition, a second groove portion 28 is formed at a part of the side surface in the vicinity of the second ventilation hole 20. The 2nd groove part 28 and the 1st groove part 30 are connected by the side surface of 3t of upper parts of the main body. The first and second groove portions 30 and 28 form a ventilation path that allows the internal space and the outside air to communicate with each other when the microphone cover 4 is fitted to the main body 3. The function and mode of the formed ventilation path will be described later in detail.

FIG. 3 is a plan view of the main body 3 in a state where the upper surface of the microphone cover 4 is removed. Here, in order to facilitate understanding of the positional relationship with the main body upper part 3t in a state in which the microphone cover 4 is fitted, the microphone cover 4 is represented by a cross section.
As described above, the two microphone sound ports 16 and 18 and the second ventilation hole 20 are closed with a filter 22 (indicated by a two-dot chain line in FIG. 3) in order to prevent water droplets and dust from entering. . The filter 22 is formed of a material having a fine eye and a small influence on the acoustic surface, such as a waterproof porous membrane or a nonwoven fabric. Further, one filter 22 collectively closes three of the two microphone sound ports 16 and 18 and the second ventilation hole 20. The filter 22 is attached (applied) to the upper part of the main body with, for example, a double-sided tape or an adhesive in order to facilitate replacement when it becomes dirty or damaged.

  In addition, claw receiving portions 40 and 42 are formed at both ends of the main body upper portion 3t as viewed in the longitudinal direction. These claw receiving portions 40 and 42 are used when the microphone cover 4 is fitted.

FIG. 4 is a perspective view when the microphone cover 4 is viewed from the back side (inner surface side).
At both end portions of the microphone cover 4 in the longitudinal direction, fitting claws 44 and 46 are provided. These fitting claws 44, 46 are hooked (so-called “engaged”) with the claw receiving portions 40, 42 when the main body 3 is covered with the microphone cover 4, thereby fixing the microphone cover 4 to the main body 3. To play a role.

  A partition 24 is attached to the back surface of the microphone cover 4. The partition 24 is a member for partitioning the internal space formed between the microphone cover 4 and the main body upper portion 3t as described above into three. As for the partition 24, the edge part which contact | connects the main body upper part 3t is formed with elastic bodies, such as rubber | gum. With the microphone cover 4 fitted to the main body 3, the end of the partition 24 comes into close contact with the upper portion 3t of the main body so that the inner space is divided into three spaces (divided spaces). Is done. Thereby, since the space leading to the two microphone sound ports 16 and 18 is completely partitioned, directivity by a plurality of microphones can be exhibited.

[Structure inside the microphone cover]
FIG. 5 is a longitudinal sectional view (sectional view taken along line VV in FIG. 3) schematically showing the structure inside the microphone cover 4 in a state where the microphone cover 4 is attached to the main body 3.
First, a front microphone sound port 18, a second ventilation hole 20, and a rear microphone sound port 16 are provided in the upper part 3 t of the main body, and depressions 17 and 19 are provided around the microphone sound ports 16 and 18, respectively. Is formed. The recesses 17 and 19 and the second vent hole 20 are closed by the filter 22. That is, it can be seen that the microphone sound ports 16 and 18 are located at the bottoms of the depressions 17 and 19. Such a structure contributes to further suppressing the acoustic influence by securing a larger area of the ventilation portion of the filter 22.

  On the other hand, a partition 24 is attached to the center of the back side of the microphone cover 4, and when the microphone cover 4 is attached to the main body 3, the end of the partition 24 is pressed against and closely contacts the filter 22. It can be seen that is sandwiched between the partition 24 and the upper part 3t of the main body. As described above, an elastic body such as rubber is used for the end portion (or the whole) of the partition 24, and the space inside the microphone cover 4 is completely partitioned by the end portion being in close contact with the filter. Three spaces partitioned in this way, that is, a front space 34 that communicates with the front microphone sound port 18, a ventilation space 36 that communicates with the second vent hole 20, and a rear space 32 that communicates with the rear microphone sound port 16 are formed. Thus, the directivity by the two microphones is maintained.

FIG. 6 is a lateral end view (end view along line VI-VI in FIG. 3) of the partition 24 in a state where the microphone cover 4 is attached to the main body 3.
As shown in FIG. 6, when the microphone cover 4 is attached to the main body 3, the partition 24 attached to the back side of the microphone cover 4 is crimped to the filter 22. Therefore, it can be seen that a partition wall is formed between the microphone cover 4 and the main body upper portion 3t at the position of the cross section. Since the partition 24 acts in this way, the space inside the microphone cover 4 is sufficiently partitioned.

[Ventilation path A]
FIG. 7 is a lateral end view (end view along the line VII-VII in FIG. 3) of the second ventilation hole 20 when the microphone cover 4 is attached to the main body 3.
As described above, the second groove portion 28 is formed on the side surface of the main body upper portion 3t. When the second groove 28 is covered with the microphone cover 4, a tunnel is formed by the microphone cover inner wall 4 e and the second groove 28 being close to each other. This tunnel functions as the “ventilation path A”, and the ventilation space 36 communicates with the “ventilation path B” to be described later, thereby realizing ventilation.

[Ventilation path B]
Next, FIG. 8 is a lateral end view (end view along the line VIII-VIII in FIG. 3) of the front microphone sound port 18 when the microphone cover 4 is attached to the main body 3.
A first groove portion 30 extending along the joint between the microphone cover 4 and the main body 3 is formed on the side surface of the main body upper portion 3t. When the first groove 30 is covered with the microphone cover 4, a tunnel is formed by the microphone cover inner wall 4e and the first groove 30 being close to each other. This tunnel has a shape in which the base end portion of the side surface of the upper body 3t is cut out. This tunnel functions as the “ventilation path B”, and communicates with the outside air (outside of the microphone cover 4) at the outside air entrances 52 and 54, which will be described later, and realizes ventilation with the “ventilation path A”.

  FIG. 8 shows a cross section of the front microphone sound port 18, but the cross section of the rear microphone sound port 16 has a structure substantially equivalent to this.

[Cooperation between ventilation path A and ventilation path B]
FIG. 9 is a view schematically showing “ventilation path A” and “ventilation path B” formed by the first groove section 30, the second groove section 28, and the microphone cover inner wall 4e. Here, for convenience, the main body upper part 3t is shown covered with the microphone cover 4, but holes, grooves and gaps formed on the wall surface of the main body upper part 3t that cannot be seen from the outside of the microphone cover 4 are broken lines. It is shown in

  The first groove portion 30 and the second groove portion 28 are both formed on the wall surface of the main body upper portion 3t, and the first groove portion 30 and the second groove portion 28 are located in the vicinity of the second vent hole 20, that is, the second groove portion. Are connected at the starting end of the groove 28. In addition, the first groove 30 is connected to the outside air inlets 52 and 54 formed by hooking the claw receiving portions 40 and 42 and the fitting claws 44 and 46 inside the microphone cover 4.

  Air (outside air) indicated by hatched arrows in FIG. 9 mainly enters the inside of the microphone cover 4 from the outside air inlets 52 and 54, but it is also between the microphone cover 4 and the wall surface of the main body upper portion 3t. There is a narrow gap, and a very small amount of air can be vented through this gap.

  As indicated by the shaded arrows in FIG. 9, the air that has entered the inside of the microphone cover 4 moves in the ventilation path B along the first groove 30, and the first groove 30 and the second groove 30 The connecting position of the groove 28 is reached. Then, as shown by the black arrow in FIG. 9, the air enters the ventilation path A and reaches the ventilation space 36 that leads to the second ventilation hole 20.

  As described above, even if the second ventilation hole 20 is located inside the partitioned ventilation space 36, the second ventilation hole 20 sufficiently passes air from outside air (outside the microphone cover 4) via the ventilation path A and the ventilation path B. Intake and air can be supplied to an air battery that serves as a power source for the ear-mounted hearing aid 1.

  In addition, although the flow of air is shown by the arrow here, it does not mean that such a flow of air in one direction actually occurs. The arrow only represents the air permeability (the possibility of passing air).

Here, the openings such as the outside air entrances 52 and 54 are sufficiently narrow although ventilation can be ensured. Further, since the main body 3 and the microphone cover 4 are water-repellent, water is difficult to enter and the waterproofness of the main body 3 can be sufficiently secured.
In addition, a gap may be formed between the first groove portion 30 and the microphone cover 4, but the cross-sectional area of the ventilation path B is a structure that abruptly expands with respect to this gap. Is unlikely to enter the ventilation path B.

  Thus, according to the ear-hearing type hearing aid 1 of the present embodiment, the microphone cover 4 is covered separately from the first vent hole 8 provided in a portion (for example, a battery holder or the like) positioned below in the worn state. Since the second vent hole 20 is also provided at the position, any vent hole is not easily blocked by sweat or the like, and it is easy to ensure air permeability. Therefore, even if any one of the vent holes (the first vent hole 8 or the second vent hole 20) is blocked with water droplets, the air permeability can be secured by the other vent holes. Therefore, the supply of air to the air battery can be maintained and the ear-mounted hearing aid 1 can be continuously operated.

  Since the second vent hole 20 can be formed at a substantially middle position between the front microphone sound port 18 and the rear microphone sound port 16 which are arranged at an appropriate interval, the size of the entire hearing aid is increased excessively. There is nothing.

  Further, since the main body 3 is subjected to water repellent treatment, even when water drops such as water or sweat adhere to the main body 3, the main body 3 hardly stays on the surface, and the infiltration of water drops into the main body 3 can be avoided. Furthermore, since the second ventilation hole 20 and the microphone sound ports 16 and 18 are blocked by the filter 22, it is possible to prevent water droplets and dust from entering the holes.

  And the interior space surrounded by the microphone cover 4 and the upper surface (main body upper part 3t) of the main body 3 is partitioned into three subspaces, so that the front space 34 and the rear space 32 are completely partitioned. Therefore, the directivity by two microphones can be maintained. Furthermore, since the front space 34 and the rear space 32 are partitioned to have the same volume and are isolated from the ventilation space 36 and the ventilation paths A and B, the influence on the acoustic surface is minimized. be able to.

  In addition, since each of the sound inlets 12 and 14 is opened toward both sides of the microphone cover 4, even if hair or the like enters, the tips thereof do not easily come into contact with the filter 22. Thereby, damage to filter 22 can be prevented and the waterproofness can be maintained for a long time.

  From the viewpoint of maintenance, since the microphone cover 4 is detachable, even if water droplets or dust enters from the sound inlets 12 and 14, it can be easily removed. Even if the filter 22 is dirty or damaged, it can be easily replaced.

  In addition, since a part of the main body 3 is covered with the single microphone cover 4, the appearance of the whole ear hook type hearing aid 1 can be clearly and clearly displayed.

The present invention can be implemented with various modifications without being limited to the above-described embodiment.
For example, in the ear-mounted hearing aid 1 of one embodiment, a member having a shape in which two partitions are integrated with the partition 24 is used, but two independent partitions may be used instead.
In one embodiment, one filter 22 blocks the two microphone sound ports 16 and 18 and the second vent hole 20 together, but each component may be blocked by individual filters.

1 Ear Hearing Aid 2 Earphone 3 Main Body 3t Upper Body 4 Microphone Cover 4e Microphone Cover Inner Side 5 Earphone Connector 6 Battery Holder 8 First Vent 10 Mode Switch Button 12 Front Sound Intake 14 Rear Sound Intake 16 Rear Microphone Sound mouth 17, 19 Recess 18 Front microphone sound mouth 20 Second vent hole 22 Filter 24 Partition 28 Second groove 30 First groove 32 Rear space 34 Front space 36 Ventilation space 40, 42 Claw receiving portions 44, 46 Nail 52, 54 Outside air entrance

Claims (7)

A main body that houses a plurality of microphones;
A first vent formed in the battery holder of the main body;
A plurality of microphone sound ports that are formed in the outer surface of the main body so as to be opened on the upper surface along the front-rear direction in a worn state, and for inputting sound individually to the plurality of microphones;
A second air hole formed in the upper surface to ensure air permeability between the inside and the outside of the main body;
A cover member that is attached to the main body in a state of covering the plurality of microphone sound ports and the second vent hole, and that forms an internal space between the upper surface in the attached state;
A partition member that is provided between the upper surface and the cover member and divides the internal space into separate subspaces for the plurality of microphone sound ports and the second vent holes;
A plurality of sound intake ports that are formed in the cover member and individually open to the outside a plurality of the divided spaces that communicate with the plurality of microphone sound ports when attached to the main body;
A ventilation path that is formed between the main body and the cover member in accordance with the attachment of the cover member and that allows the sub-space to communicate with the second ventilation hole and the outside air when the cover member is attached to the main body. Equipped with ear-type hearing aid. The behind-the-ear hearing aid according to claim 1,
The partition member is
A plurality of subdivided spaces leading to a plurality of the microphone sound ports are divided into the same volume,
These subdivision spaces are
An over-the-ear hearing aid characterized by being isolated from the ventilation path by an inner wall of the cover member. The behind-the-ear hearing aid according to claim 1 or 2,
The microphone mouthpiece is
It is formed in two places with a predetermined interval on the upper surface,
The second vent hole is
An ear-mounted hearing aid, which is located between the two microphone sound ports. The hearing aid type hearing aid according to any one of claims 1 to 3,
The cover member is
It is attached in a state fitted to a part of the main body,
The ventilation path is
A first groove that is formed in the main body along a joint between the main body and the cover member, and that ensures air permeability in a direction along the joint in the attached state of the cover member to the main body;
An outside air advance inlet that allows the first groove to communicate with outside air in a state in which the cover member is attached to the main body;
An ear-hearing type hearing aid, comprising: the subdividing space that communicates with the second ventilation hole in a state in which the cover member is attached to the main body; and a second groove portion that interconnects the first groove portion. The behind-the-ear hearing aid according to claim 4,
Water repellent finish is applied to the outer surface of the main body, and in the attached state of the cover member to the main body, water penetration to the joint between the main body and the cover member is suppressed by the water repellency of the outer surface. Ear-type hearing aid characterized by The hearing aid type hearing aid according to any one of claims 1 to 5,
Multiple sound intakes
An over-the-ear hearing aid, wherein a plurality of microphone sound openings are opened on the upper surface through the subdivision space in a direction intersecting with the opening direction. The hearing aid type hearing aid according to any one of claims 1 to 6,
An ear-hearing hearing aid further comprising a waterproof porous membrane that is attached to the upper surface and covers each of the plurality of microphone sound ports and the second vent holes covered by the cover member.

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