JP6516893B1 - Conversation aid device - Google Patents

Abstract

A conversation assistance device capable of reliably transmitting conversation contents only to the other party of a conversation without being heard by a third party, and capable of being manufactured at low cost with a simple structure. Intended to provide. A conversation assistance device (1) comprises a reflection plate (2) and a grip part (3). The reflecting plate 2 is an elliptic curved surface E rotated with a symmetry axis consisting of a major axis of an ellipse as a first focal point F1 and a second focal point F2 as a rotation axis R, and cut at a cutting plane S passing the rotation axis R It comprises one of the partially elliptic curved surfaces EP. The reflecting plate 2 has a focal distance L1 of 20 cm to 60 cm, an apex distance L2 (L3) of 5 cm or less, a minor axis length L4 of 5 cm or more, and a half of the minor axis length L4 is a focal distance It is designed on the basis of the ellipse which becomes the range of length of 1/3 or less. [Selected figure] Figure 2

Description

  The present invention relates to a speech aid device. Specifically, a conversation assistance device that can reliably communicate conversation contents only to the other party of the conversation without being heard by a third party, and can be manufactured at low cost with a simple structure. Pertaining to

  In general, a deaf person is a person who can not hear as hard as it is difficult to interact in everyday life, depending on the type and location of the deafness, depending on the cause and part of the disorder, sensorineural deafness, conductive deafness, and mixed deafness. It is classified broadly.

  Especially in the present-day Japan facing a super-aging society, presbycusis, which is one of the sensorineural hearing loss that progresses with aging, has become a major social problem. As presbyopia deafness often progresses slowly over time, it is not possible for the person to communicate smoothly with them without being aware of it, and there are many people who have troubles at work or at home.

  In order to improve such a problem, a hearing aid as a hearing aid for supplementing the hearing ability of the deaf person may be attached to the deaf person's auricle to amplify the frequency band difficult for the deaf person to hear and compensate the deaf person's hearing ability. It has been done. Such a hearing aid is basically composed of a microphone, an amplification circuit unit, and a drive battery, and a normal sound pressure type earphone is used as a speaker (Patent Document 1).

  As a drive battery used for the above-mentioned hearing aid, a so-called "air battery" is generally used which takes in air inside and causes a chemical reaction with a solvent in the battery to generate electricity. Since this air battery is inexpensive but has a short battery life, there is a drawback that the wearing period of the person with hearing loss is limited. Therefore, in recent years, a hearing aid that can use a rechargeable battery (Patent Document 2) and a hearing aid equipped with a fuel cell have been proposed (Patent Document 3).

  Patent Document 4 discloses an auricle-mounted hearing aid that does not use electrical energy. Specifically, a reflecting surface that forms a paraboloid or a partially curved surface formed of an elliptical surface is directly attached to the ears of the person who is deaf, the sound wave from the sound source is reflected by the reflecting surface, and the sound is collected to the ears By doing this, it is possible to supplement the hearing ability of the deaf person.

  On the other hand, in the hearing aids according to Patent Documents 1 to 4 described above, since it is generally necessary to design the hearing aids in accordance with the shapes of the ears and the ear holes of the deaf people, the manufacturing cost is high and Only deaf people can use it and it has become less versatile.

  Furthermore, the hearing aid device, which is originally a role to compensate for the hearing ability of the deaf person, such as the generation of unpleasant noise due to always wearing it on the body or the generation of unpleasant sound due to howling etc. As a result of the stress on the subject and the fact that wearing a hearing aid is obvious on the appearance, hearing aids for the deaf person who cares about the gaze from a third party will hesitate to wear the hearing aid However, it was not always convenient for the deaf.

  Therefore, the penetration rate of hearing aids in Japan is still low, and there has been a situation where it is necessary to take measures such as speaking in a loud voice so that deaf people can hear when talking with deaf people. However, for example, when speaking loudly with a person with a hearing loss in a hospital or in a public facility in a nursing home, the surrounding person may be bothered and the contents of the conversation may not be heard. There was a problem that people would be asked. In this respect, when each other makes a voice and talks in consideration of surrounding people, it is difficult for a hearing impaired person to hear the contents of the conversation, and it becomes stressful to talk with each other.

  In order to solve such a problem, as a substitute for the above-mentioned hearing aid device for wearing a pinnacle of a hearing impaired person, Patent Document 5 proposes a tubular conversation aid device. Specifically, it comprises a cylinder main body in which a voice transmission path is formed inside, and an enlarged portion connected to both ends of the cylinder main body, one enlarged portion serving as the speaker's mouth and the other enlarged portion heard By using it in close proximity to the ear of the speaker, it is possible to reliably transmit the speaker's voice to the listener without the speech being blocked by the ambient noise or the speech contents being leaked to the surroundings.

Unexamined-Japanese-Patent No. 08-237798 JP 2008-278329 A JP, 2014-127720, A JP 2004-015796 JP 2008-28786 A

  The above-described apparatus for hearing aids disclosed in Patent Document 5 is not always worn on the body of a person with a hearing loss, but is used only when talking with the other person, so discomfort does not occur with wearing. Because the voice of the time can be surely transmitted only to the other party without being heard by the surrounding people, it is convenient.

  However, the conversation assisting device disclosed in Patent Document 5 does not consider the shape of the main body to which the sound wave is transmitted, and the sound wave emitted from the speaker as the sound source is diffused inside the cylindrical main body. Therefore, the configuration is not necessarily such that the sound wave is efficiently transmitted near the ear of the listener. Therefore, it is necessary to use electric energy such as a microphone and a speaker in the main body, which makes the entire system expensive.

  Furthermore, when the speaker talks to the conversation hearing aid device, the mouth is close to the main body part so that the saliva adheres to the inside of the cylinder by repeated use, but the main body part is cylindrical. In addition to the above, since electric devices such as a microphone and a speaker are built in as described above, there is a problem that disassembly and cleaning is difficult and it is not preferable in terms of hygiene.

  The present invention has been made in view of the above points, and it is possible to reliably transmit the contents of conversation to only the other party of the conversation without the voice of the conversation being heard by a third party, and also simple. It is an object of the present invention to provide a speech aid apparatus which can be manufactured at low cost by the above structure.

  In order to achieve the above object, the speech aid apparatus of the present invention is a quadratic curve focusing on a target point set on a virtual reference plane, and the axis of symmetry of the quadratic curve is the rotation axis. And a reflector formed of a partial quadric surface formed by cutting the quadric surface obtained by rotating the quadratic curve.

  Here, a quadratic curve having an object point set on a virtual reference plane as a focal point, the quadratic curve obtained by rotating the quadratic curve with the symmetry axis of the quadratic curve as a rotation axis is cut. A sound wave emitted from a sound source is reflected by a reflection plate formed in a substantially curved concave shape by providing a reflection plate formed of a partial quadric surface, and is reliably directed toward a target point that is the focal point of the partial quadratic surface. Can be collected.

  If the reflecting plate is a partial elliptic surface of an elliptic curved surface obtained by rotating the oval with the symmetry axis consisting of the major axis of the oval consisting of the first focal point and the second focal point as the rotation axis, By setting the first focus, which is one of the foci, at the mouth of the speaker, and the second focus, which is the other focus of the ellipse, on the auricle of the listener, to be emitted from the first foci corresponding to the speaker's mouth The sound wave can be reliably collected to a second focus corresponding to the auricle of the listener.

  In addition, when the partially elliptical curved surface is obtained by cutting with a cut surface passing through the rotation axis, the dirt is attached to the inner surface of the reflective plate because the reflective plate is substantially curved concave opened in one direction. It is also hygienic because it is easy to clean.

  In addition, when the end in the direction of the short side in a cross-sectional view cut along the cut surface is notched, the partial elliptic curved surface can make the entire speech assistance device compact while maintaining the sound collection effect. Because the weight is also light, it will be excellent in operability regardless of age and sex. Furthermore, it is excellent in portability at the time of carrying, and a storage space when not in use can be easily secured.

  Further, the reflecting plate is a cut surface of the elliptical curved surface obtained by rotating the ellipse with the symmetry axis consisting of the major axis of the ellipse consisting of the first focus and the second focus as the rotation axis, which crosses the rotation axis. And a partially elliptical surface formed by a plane not including the first focal point among planes cut at the first cutting plane between the midpoint of the major axis and the first focal point, For example, when using the speech aid as the first focus on the speaker's side of the speech aid, the speaker speaks from the vicinity of the first focus outside the partially elliptical surface towards the reflector. Because you can face the other side, you can talk in a more natural posture.

  Further, the reflecting plate is a cut surface of the elliptical curved surface obtained by rotating the ellipse with the symmetry axis consisting of the major axis of the ellipse consisting of the first focus and the second focus as the rotation axis, which crosses the rotation axis. And a partially elliptical surface formed by a plane not including the second focal point among planes cut at the second cutting plane between the midpoint of the major axis and the second focal point, For example, when using the speech aid device as the second focus on the listener's side of the speech aid device, it is hygienic because it is not necessary to bring the speech aid device into contact with the face side including the auricle of the listener. It is possible to avoid causing an injury such as damaging the side of the face of the listener at the end face of the speech aid device.

  In addition, when at least one of the first cutting surface and the second cutting surface is a cutting surface perpendicular to the rotation axis, for example, the side having the vertical cutting surface is used as the speaker side By doing this, the speaker can talk in a state where he / she faces the listener more straightly.

  In addition, the focal distance on the rotational axis between the first focal point and the second focal point of the ellipse is within a range of approximately 20 cm to 60 cm, and a half length of the minor axis length is the focal distance. When the length is one third or less, the entire size of the conversation assistance device can be made appropriate. That is, when the length of the long axis with respect to the length of the short axis is appropriately elongated, the operability at the time of use is good, the portability is excellent, and the storage when not in use can be easily performed. .

  In addition, when the distance between focal points is shorter than 20 cm, the dialogue distance between the speaker and the listener becomes close, and it is not possible to maintain an appropriate distance between the speakers, and the speaker is forced to take an unnatural posture at the time of conversation. Become.

  On the other hand, when the distance between focal points is longer than 60 cm, the entire conversation assistance device becomes longer in the major axis direction of the ellipse and becomes larger, and the weight also increases, which makes it difficult to secure a space for storage. The operability at the time of use deteriorates.

  Furthermore, when the half length of the minor axis length exceeds the one-third length of the focal distance, the ratio of the major axis length to the minor axis length of the ellipse becomes substantially the same. It becomes a shape close to a circle. As a result, the reflecting plate has a shape that draws a large arc from the mouth of the speaker to the pinnae of the listener, which degrades the operability of the conversation assistance device and also lacks stability upon storage.

  Further, the vertex distance on the rotation axis of the first focal point and the vertex of the ellipse on the first focal point side, and the vertex distance on the rotation axis of the ellipse on the second focal point and the second focus side are respectively In the case of 5 cm or less, when the speaker's mouth is placed with the curved recess enclosed around one vertex on the rotation axis of the reflector as a guide, If the listener's ear is appropriately closed by covering the listener's pinnacle with the curved recess surrounded near the other vertex on the rotation axis of the reflector, the focus on the listener's side (for example, the second) Because the focus of the speaker and the auricle of the listener are in close proximity, the speaker and the listener can be easily positioned when using the speech aid device.

  When each vertex distance exceeds 5 cm, the focal point is greatly deviated from the vertex on the rotation axis of the reflector and the curved recess surrounded by the vertex, so the speaker's mouth or listener's ear Since the standard of the position of placing the interposition becomes vague, and the position of the speaker's mouth and the position of the pinnacle of the listener become difficult to coincide with the focus, there is a possibility that the sound collection effect of the speech aid device can not be sufficiently exhibited.

  In addition, when the minor axis length of the ellipse is 5 cm or more, the area of the reflection plate becomes moderately large, and the sound collection effect of the conversation assistance device can be enhanced.

  When the minor axis length of the ellipse is shorter than 5 cm, the area of the reflection plate is reduced, and the sound collection effect of the conversation assistance device is reduced. Furthermore, when the shape of the reflecting plate is configured from a partial elliptic surface cut by a cut surface that crosses the rotation axis of the elliptic curved surface, the opening area of the cut surface decreases, so for example, when a speaker talks to the cut surface While it becomes difficult to propagate the sound wave in the curved concave portion of the partially elliptical curved surface constituting the reflection plate, the saliva easily adheres to the periphery of the cut surface, which is unfavorably hygienic.

  In addition, the reflection plate is a partial radiation formed by one plane separated by a cutting plane passing through the rotation axis of the parabolic curved surface obtained by rotating the parabola with the symmetry axis of the parabola whose focal point is the object point. In the case of an object surface, for example, if there is a speaker's mouth serving as a sound source on the rotation axis of a parabolic surface, sound waves emitted from the speaker are reliably transmitted to the listener's pinnacle regardless of the distance between the speaker and the listener. Can be collected.

  In addition, since the partial parabolic curved surface has a substantially curved concave shape opened in one direction, it is hygienic because cleaning is easy even if dirt adheres to the inner surface of the reflecting plate.

  The conversation assistance device according to the present invention can transmit conversation contents to only the other party of a conversation reliably without being heard by a third party, and can be manufactured at low cost with a simple structure. be able to.

It is a figure which shows the speech assistance apparatus which concerns on the 1st Embodiment of this invention, (a), (b) is a whole external view of a speech assistance apparatus, (c) is a figure which shows the design method of a reflecting plate. It is a figure which shows the use condition of the speech assistance apparatus which concerns on the 1st Embodiment of this invention. It is a whole external view of the speech assistance apparatus which concerns on the 2nd Embodiment of this invention. It is a figure which shows the speech assistance apparatus which concerns on the 3rd Embodiment of this invention, (a) is a figure which shows the use condition of a speech assistance apparatus, (b), (c) is a whole external view of a speech assistance apparatus. . It is a figure which shows the speech assistance apparatus which concerns on the 4th Embodiment of this invention, (a) is a whole external view of a speech assistance apparatus, (b) is a figure which shows the design method of a reflecting plate, (c) is conversation assistance. It is a figure which shows the use condition of an apparatus.

  Hereinafter, embodiments of the present invention relating to a conversation assistance device will be described with reference to the drawings for providing an understanding of the present invention.

Example 1
First, the conversation assistance device 1 according to the first embodiment of the present invention will be described with reference to FIG. The conversation assistance device 1 is made of a fiber reinforced plastic (FRP) material, and as shown in FIGS. 1 (a) and 1 (b), a reflector 2 composed of a substantially curved concave partial elliptical surface with one direction opened. When the communicators talk in the conversation assistance device 1, one of the speaker A and the listener B holds the conversation assistance device 1 mainly from the grasping part 3 for holding the conversation assistance device 1 at a predetermined position. ing.

  Here, it is not necessary to necessarily have the holding part 3. However, since the conversation assistance device 1 has a substantially curved concave shape consisting of a partially elliptical curved surface obtained by cutting a part of an elliptical curved surface, the operability and portability of the conversation assistance device 1 when used are poor. Therefore, the operability when using the conversation assistance device 1 is improved and the portability when being carried is also improved by providing the gripping unit 3. Furthermore, in order to function as a support member at the time of storage, it is preferable that the grip portion 3 be provided.

  Also, the reflecting plate 2 does not necessarily have to be made of a fiber reinforced plastic material. For example, a resin material, a metal material, a glass material, wood, etc. can be suitably selected from well-known materials, Comprising: It does not specifically limit about the raw material.

  FIG. 1C is a view showing a method of designing the reflection plate 2 constituting the conversation assistance device 1 according to the first embodiment. As shown in FIG. 1 (c), the reflecting plate 2 is an elliptic curved surface E in which a symmetry axis consisting of a major axis of an ellipse that is a first focal point F1 and a second focal point F2 is rotated as a rotation axis R It comprises one partial elliptic curved surface EP cut at a cutting plane S passing through the rotation axis R.

  At this time, an ellipse serving as a reference of the elliptic curved surface E has an inter-focus distance L1 of about 20 cm to 60 cm on the rotation axis R of the first focus F1 and the second focus F2, and the first focus F1 and the first focus The vertex distance L2 on the rotation axis R with the vertex T1 of the ellipse on the F1 side and the vertex distance L3 on the rotation axis R between the second focal point F2 and the vertex T2 of the ellipse on the second focal point F2 are each approximately 5 cm Hereinafter, an elliptical curved surface is based on an ellipse in which the minor axis length L4 is approximately 5 cm or more and the half length of the minor axis length L4 is set to a length of one third or less of the focal distance L1. E is configured.

  Here, the focal distance L1 does not necessarily have to be configured within a range of approximately 20 cm to 60 cm as an ellipse that is a basis of the elliptic curved surface E. For example, the focal distance L1 may be configured to be shorter than 20 cm and longer than 60 cm.

  However, if the focal distance L1 becomes shorter than about 20 cm, the dialogue distance between the speaker A and the listener B at the time of using the speech aid device 1 becomes close, and an adequate distance can not be maintained between the speakers. A will be forced into an unnatural posture at the time of conversation.

  On the other hand, when the focal distance L1 is longer than approximately 60 cm, the entire conversation assistance device 1 becomes longer in the major axis direction of the ellipse and becomes larger, and the weight also increases, thereby deteriorating portability and operability during use. , It will be difficult to secure space for storage.

  In addition, it is not necessary that the vertex distance L2 (L3) is 5 cm or less as the ellipse that is the basis of the elliptic curved surface E. For example, it may be configured to exceed 5 cm.

  However, for example, when the vertex distance L2 (L3) exceeds 5 cm, the mouth of the speaker A is because the focal point is largely deviated from the vertex on the rotation axis of the reflection plate and the curved recess enclosed near the vertex. And the target position for placing the auricle of listener B becomes vague, and the position of the mouth of speaker A and the position of the auricle of listener B become difficult to coincide with the focus, so there is a possibility that the sound collection effect of the conversation assistance device can not be sufficiently exhibited. is there.

  In addition, the half length of the minor axis length L4 does not necessarily have to be set in the range of a length equal to or less than one third of the focal distance L1. For example, the half length of the short axis length L4 may be configured to be longer than one third of the focal distance L1.

  However, for example, when the half length of the minor axis length L4 exceeds one third of the focal distance L1, the ratio of the major axis length to the minor axis length of the ellipse becomes substantially the same. It becomes a shape close to a circle. Therefore, the reflecting plate 2 has a shape in which a large arc is drawn from the mouth of the speaker A to the pinna of the listener B, so the operability of the conversation assistance device 1 is deteriorated and the stability at the time of storage is lacking. It becomes a thing.

  In addition, it is not necessary that the minor axis length L4 be approximately 5 cm or more as an ellipse that is a basis of the elliptical curved surface E. For example, the minor axis length L4 may be shorter than 5 cm. However, if the minor axis length L4 is shorter than 5 cm, the total area of the reflection plate 2 is reduced, and the sound collection effect of the conversation assistance device 1 is reduced. From the viewpoint of enhancing the sound collection effect, The minor axis length L4 is preferably 5 cm or more.

  Table 1 is table data showing changes in the minor axis length L4 of the ellipse when the vertical axis is the focal distance L1 and the horizontal axis is the vertex distance L2 (L3).

[Table 1]

  The conditions described above, that is, the focal distance L1 is about 20 cm to 60 cm, the vertex distance L2 (L3) is about 5 cm or less, the minor axis length L4 is about 5 cm or more, and a half of the minor axis length L4 Is a range of length equal to or less than a third of the focal distance L1, and the focal length L1 and the vertex distance such that the row and column of Table 1 are orthogonal to the portion surrounded by the dotted line in Table 1 It is a combination of L2 and L3. That is, when the reflector 2 is designed on the basis of an ellipse set by the combination of the focal length L1 and the vertex distance L2 (L3) satisfying this, the distance between the speaker A and the listener B when using the conversation assistance device 1 is appropriate. Thus, the conversation assisting device 1 can be made excellent in operability and portability.

  In the conversation assistance device 1 configured as described above, for example, as shown in FIG. 2, the speaker A who is one of the communicators holds the holding unit 3, and the listener B listens to the vicinity of the second focus F 2 of the reflecting plate 2. Located near the pinna of the ear. In this state, when the speaker A speaks by placing his / her mouth at the first focal point F1, the sound wave emitted from the speaker A's mouth as a sound source is reflected by the reflector 2 and a listener near the second focal point F2 Sound can be collected by B's pinnacle.

Example 2
The invention according to the second embodiment will be described based on FIG. The description of the parts common to the first embodiment will be omitted. Similarly to the first embodiment, the reflection plate 2 of the conversation assistance device 1 according to the second embodiment has the axis of symmetry as the rotation axis R, which is the long axis of the ellipse that is the first focus F1 and the second focus F2. It is an elliptical curved surface E which is rotated, and is constituted by one partial elliptical curved surface EP cut at a cutting surface S passing through the rotation axis R, and further in the cross sectional view by the cutting surface S It has a shape cut along the long axis direction.

  As described above, since the weight of the conversation assistance device 1 can be reduced by partially cutting out both ends in the short direction of the reflection plate 2 along the long axis direction, operability at the time of conversation is improved. It has excellent portability and can be stored in a space-saving manner.

  In addition, even if both ends in the short direction of the reflection plate 2 are cut away, the reflection range of the sound wave is constant because it has a constant reflection area along the long axis direction including the first focal point F1 and the second focal point F2. The second embodiment can exhibit the same sound collection effect as that of the first embodiment.

  Here, it is not necessary to cut out both ends in the short side direction of the reflecting plate 2. For example, only one end may be cut away.

[Example 3]
The invention according to the third embodiment will be described based on FIG. The description of the parts common to the first embodiment will be omitted. In the conversation assistance device 1 according to the third embodiment, as shown in FIG. 4, the first focal point F1 and the second focal point F2 are located outside the reflecting plate 2 so that a part thereof has a substantially curved concave cross section. And a partially elliptical curved surface EP cut at a cutting plane.

  In addition, the ellipse used as the reference | standard of the elliptical curved surface E which comprises the reflecting plate 2 which concerns on Example 3 is as Table 1 showing. That is, the focal distance L1 is about 20 cm to 60 cm, the vertex distance L2 (L3) is about 5 cm or less, the minor axis length L4 is about 5 cm or more, and a half of the minor axis length L4 is the focal distance The reflector 2 is designed on the basis of the ellipse set to the range of length of 1/3 or less of L1.

  The reflecting plate 2 according to the third embodiment has the middle point O to the first focus F1 with respect to the middle point O of the first focus F1 and the second focus F2 of the elliptic curved surface E configured as described above. By a second cutting plane S2 between the middle point O and the second focal point F2 and crossing the rotation axis R. It is composed of a partially elliptical surface EP that has been cut.

  Here, the first cut surface S1 does not necessarily intersect the rotation axis R substantially perpendicularly but may intersect the rotation axis R at a predetermined angle. However, when the first cut surface S1 intersects the rotation axis R substantially perpendicularly, a circular opening 4 perpendicular to the rotation axis R is formed on the cut surface cut by the first cut surface S1. Is formed. At this time, assuming that the opening 4 formed by the first cut surface S1 is the speaker A side, the speaker A can speak toward the opening 4, so the speaker A faces the listener B. It is possible to have a conversation in a natural position.

  Furthermore, since the opening 4 is positioned between the middle point O and the first focal point F1, when the speaker A brings the mouth closer to the vicinity of the opening 4, the mouth of the speaker A inevitably becomes near the first focal point F1. Because of the position, the sound wave emitted from the speaker A can be reflected in the reflecting plate 2 and can be reliably collected at the second focal point F2.

  Moreover, it is not necessary to necessarily make a part of reflecting plate 2 into a cross-sectional substantially curved concave shape. For example, the whole of the reflecting plate 2 may be cylindrical. However, when a part of the reflection plate 2 has a substantially curved concave cross section, for example, even when dirt such as saliva adheres to the inside of the reflection plate 2, cleaning can be easily performed. Therefore, from the viewpoint of hygiene, it is preferable that a part of the reflection plate 2 has a substantially curved concave cross section.

  Also, the second cut surface S2 does not necessarily have to be a cut surface that intersects the listener B side at an acute angle with the rotation axis R, as shown in FIG. 4A. For example, similarly to the first cut surface S1, the second cut surface S2 may be set to be a cut surface perpendicular to the rotation axis R.

  However, by cutting the second cut surface S2 with a cross section that intersects the rotation axis R at an acute angle with the listener B side, for example, the listener B can cut the cut surface side by the second cut surface S2. On the side, the portion in contact with the auricle of the listener B has a cutaway shape. Therefore, it is hygienic because it is not necessary to bring the speech aid device 1 in intimate contact with the face side including the auricle of the listener B, and the end face of the speech aid device 1 is injured such as damaging the face side of the listener B It can be avoided.

Example 4
The invention concerning Example 4 is explained based on FIG. The description of the parts common to the first embodiment will be omitted. The conversation assistance device 1 according to the fourth embodiment, as shown in FIG. 5A, is configured of a reflection plate 2 having a substantially curved concave cross section, and a grip portion 3 including an opening formed in a part of the reflection plate 2. It is done.

  Here, it is not necessary to necessarily have the holding part 3. However, since the conversation assistance device 1 has a substantially curved concave shape consisting of a partial parabolic curved surface CP obtained by cutting a part of the parabolic curved surface C, the operability and portability of the conversation assistance device 1 when used are poor. Therefore, it is preferable to include the gripping portion 3 in order to improve the operability when using the conversation assistance device 1 and to improve the portability at the time of carrying by providing the gripping portion 3.

  In addition, the grip 3 does not necessarily have to be an opening formed in a part of the reflection plate 2. For example, the configuration may be separately attached to the outer side surface of the reflecting plate 2.

  The reflection plate 2 is a parabolic curved surface C rotated with the axis of symmetry of the parabola based on the focal point F as the rotation axis R, as shown in FIG. It is comprised from one partial paraboloid curved surface CP.

  Here, the reflecting plate 2 does not necessarily have to be composed of one partial parabolic curved surface CP cut at the cutting plane S passing through the rotation axis R. For example, it may be a shape in which a part of the open end face of the partially parabolic curved surface CP is cut away.

  As shown in FIG. 5C, the conversation assistance device 1 including the reflection plate 2 configured in this way, for example, the speaker A holds the grip 3 so that the vicinity of the focal point F corresponds to the vicinity of the auricle of the listener B. The position adjustment of the conversation assistance device 1 is carried out in a state of holding the sound wave, and by talking to the listener B, the sound wave emitted from the speaker A is reflected by the reflection plate 2 and the sound is collected near the auricle of the listener B be able to.

  As described above, the conversation assistance device according to the present invention can reliably transmit conversation contents only to the other party of the conversation without being heard by a third party during the conversation, and at a low cost due to the simple structure. It can be manufactured.

Reference Signs List 1 conversation aid device 2 reflector 3 grip 4 opening A speaker B listener C parabolic surface CP partial parabolic surface E partial curved surface EP partial elliptic surface F focal point F1 first focal point F2 second focal point L1 interfocal distance L2 , L3 vertex distance L4 short axis length O middle point R rotation axis S cut surface S1 first cut surface S2 second cut surface T1, T2 vertex

Claims (4)

A cutting of the elliptical surface obtained by rotating the ellipse with the symmetry axis consisting of the major axis of the ellipse consisting of the first focal point and the second focal point set on the virtual reference plane as a rotation axis A reflector formed of a partially elliptical curved surface formed by the first focal point and the second focal point not including the first focal point cut in the plane;
The partially elliptical surface is a first cut surface between the midpoint of the major axis and the first focal point, and a second cut surface between the midpoint and the second focal point. Disconnected speech aid device. It said first cutting surface, and at least one of the second cutting plane, conversation assistance device according to claim 1, wherein the cutting plane perpendicular to the axis of rotation. The ellipse is
The focal distance on the rotation axis between the first focal point and the second focal point is in the range of about 20 cm to 60 cm,
The minor axis length of the ellipse is 5 cm or more,
The vertex distance on the rotation axis between the first focal point and the vertex of the ellipse on the first focal point side, and the rotation axis between the second focal point and the vertex of the ellipse on the second focal side The top distance at the top is less than 5 cm, respectively
The conversation assistance device according to claim 1 or 2 , wherein a half length of the minor axis length of the ellipse is equal to or less than a third of the focal distance. One plane separated by a cutting plane passing through the rotation axis of the paraboloid obtained by rotating the parabola as a rotation axis with the symmetry axis of the parabola having a specific target point set on the virtual reference plane as a focal axis Equipped with a reflector made of a partially parabolic curved surface
Conversation aid device .

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