WO2014061646A1

WO2014061646A1 - Earphone

Info

Publication number: WO2014061646A1
Application number: PCT/JP2013/077935
Authority: WO
Inventors: 悟岩崎; 靖人藤井; 春美林; 岩下　修三
Original assignee: 京セラ株式会社
Priority date: 2012-10-15
Filing date: 2013-10-15
Publication date: 2014-04-24

Abstract

The purpose of the invention is to provide an earphone that can be impeded from coming out of the ear canal. An earphone (1) is provided with: a cylindrical insertion part (2) inserted at one end into the ear canal; a transmission member (4) provided to part of a side surface of the insertion part (2), a part of the transmission member being in contact with the tragus of the user when the insertion part (2) is inserted into the ear canal, and the transmission member housing an electroacoustic conversion element (3) for generating acoustic vibrations in accordance with an electric signal; and a vibration member (5) provided to an inner surface of the insertion part (2) and caused to vibrate in response to acoustic vibration from the electroacoustic conversion element (3).

Description

earphone

The present invention relates to an earphone that vibrates the eardrum and tragus.

Conventionally, as one type of earphone, a bone conduction type earphone has been proposed in which sound vibrates into the skull, stimulates the inner ear of the cochlea, etc., converts the vibration into an electrical signal in the cochlea and transmits it to the brain (see below) , See Patent Document 1). Japanese Patent Application Laid-Open No. 2004-208220 discloses an earphone in which a vibration element is provided on the outer side of a cylindrical penetrating portion.

However, the technique disclosed in Japanese Patent Application Laid-Open No. 2004-208220 has a structure in which the earphone is fitted into the external auditory canal of the human body. However, since the vibration element is disposed near the surface of the external ear canal, the earphone may come off the external ear canal due to vibration of the vibration element. Is big. The present invention has been made in view of the above, and an object of the present invention is to provide an earphone that can be prevented from coming off from the ear canal.

An earphone according to an embodiment of the present invention is provided with a cylindrical insertion portion in which one end is inserted into the ear canal and a part of a side surface of the insertion portion, and a part of the earphone is inserted in the ear canal. In contact with the beads and receiving acoustic vibration from the electroacoustic transducer provided on the inner surface of the insertion portion, and a transmission member including an electroacoustic transducer that generates acoustic vibration in response to an electrical signal And a vibrating member that vibrates.

It is the general-view figure which showed the state with which the earphone which concerns on this embodiment was mounted | worn with the left ear | edge. 1 is an overview diagram of an earphone according to an embodiment. FIG. 3 is a cross-sectional view of the earphone along XX in FIG. 2. FIG. 4 is a cross-sectional view of the fitting member and the vibration member along YY in FIG. 3. It is sectional drawing of a vibrating body, a joining member, and an electroacoustic transducer which comprise a transmission member. It is sectional drawing equivalent to FIG. 3 of the earphone which concerns on a 1st modification. It is sectional drawing equivalent to FIG. 3 of the earphone which concerns on a 1st modification. It is sectional drawing equivalent to FIG. 3 of the earphone which concerns on a 2nd modification. It is sectional drawing equivalent to FIG. 3 of the earphone which concerns on a 2nd modification. It is a specific example of the earphone which concerns on a 2nd modification, Comprising: It is sectional drawing equivalent to FIG. It is a specific example of the earphone which concerns on a 2nd modification, Comprising: It is sectional drawing equivalent to FIG. It is sectional drawing equivalent to FIG. 3 of the earphone which concerns on a 3rd modification. It is an outer periphery sound evaluation result regarding the earphone which concerns on a 3rd modification. It is an outer periphery sound evaluation result regarding the earphone which concerns on a 3rd modification. It is a modification of the earphone which concerns on a 2nd modification, Comprising: It is sectional drawing equivalent to FIG.

Embodiments of an earphone according to the present invention will be described below with reference to the accompanying drawings. In addition, this invention shall not be limited to the following embodiment. Note that FIGS. 1 to 4 show what is worn on the left ear.

<Configuration of earphone>
The earphone 1 according to the present embodiment is used for a portable music terminal such as a smartphone, a portable audio player or a portable media player, or a wireless communication terminal such as a radio. The earphone 1 is provided with a cylindrical insertion portion 2 for inserting one end into the external auditory canal of the human body, and a part of a side surface of the insertion portion 2, and a part of the tragus of the human body with the insertion portion 2 inserted into the external ear canal. The transmission member 4 in which the electroacoustic transducer 3 that generates acoustic vibration in response to the electrical signal and the electroacoustic transducer 3 provided on the inner surface of the insertion portion 2 are received. And a vibrating member 5 that vibrates. Further, the transmission member 4 is provided with a hook member 6 that can be elastically deformed to be hooked on the pinna of the human body.

The insertion part 2 has a cylindrical shape and is used by being fitted to the ear canal. The insertion portion 2 has a through hole T. When the insertion portion 2 is fitted to the ear canal, the space between the inside of the ear canal and the outside of the ear canal is connected by the through hole T.

<Since the insertion part 2 is comprised from the elastic body which can deform | transform, it can be easily deform | transformed with a human force and can be fitted in the ear canal. Further, as shown in FIG. 3, both ends of the insertion portion 2 are curved so as to be easily fitted into the ear canal, and are adjusted so that the inner surface of the ear canal is not damaged. And the insertion part 2 is formed so that an outer diameter may become small compared with the external shape of the area | region where the outer diameter of both ends is pinched by both ends. By reducing the outer diameter of both ends of the insertion portion 2, one end of the insertion portion 2 can be easily fitted into the ear canal. Further, it is preferable that a portion having the smallest outer diameter is formed between one end of the insertion portion 2 and the other end of the insertion portion 2. By providing a portion having the smallest outer diameter between one end of the insertion portion 2 and the other end of the insertion portion 2, the shape of the ear canal is connected to the eardrum so as to curve in a complicated manner. It can be made easy to fit so as to correspond to a complicated shape.

The insertion portion 2 is elastically deformable and is made of, for example, a resin such as an epoxy resin, an acrylic resin, silicon, or urethane rubber. The insertion portion 2 has a cylindrical outer diameter of 10 mm to 20 mm and an inner diameter of 3 mm to 15 mm. The insertion portion 2 is set to have a vertical length of 5 mm to 30 mm.

The insertion part 2 has an extension part 2 a extending from the side surface of the insertion part 2 in a direction perpendicular to the cylindrical axis of the insertion part 2. The extending portion 2 a is provided with the electroacoustic conversion element 3 via the joining member 7. Here, the cylindrical shaft of the insertion portion 2 is coaxial with the axial direction of the through hole T. In addition, the extension part 2a may be a separate body from the insertion part 2. In such a case, the extending portion 2a is connected to the side surface of the insertion portion 2 via an adhesive material made of, for example, epoxy resin, acrylic resin, silicon, urethane rubber, or the like.

The extending portion 2a has a rectangular plate shape. A vibrating body 8 is provided on the extending portion 2a. The extending portion 2a can be formed by suitably using, for example, a material such as a synthetic resin having high rigidity and elasticity. And the acoustic vibration of the electroacoustic transducer 3 is transmitted to the extension part 2a via the vibrating body 8, and the transmission member 4 whole can be vibrated. In addition, the extension part 2a is comprised from insulating materials, such as an epoxy resin, an acrylic resin, a silicon | silicone, or urethane rubber, for example. Moreover, the extension part 2a is plate-shaped, Comprising: For example, the length of one side is 20 mm or more and 80 mm or less, and thickness is formed by 1.5 mm or more and 10 mm or less.

The vibrating body 8 has a rectangular plate shape. The vibrating body 8 can be formed by suitably using a material having high rigidity and elasticity such as acrylic resin or glass. The vibrating body 8 is provided on the extending part 2a. And the lower surface of the vibrating body 8 and the upper surface of the extension part 2a are connected through the adhesive material which consists of an epoxy resin, an acrylic resin, a silicon | silicone, or urethane rubber, for example. In addition, the vibrating body 8 is formed, for example, so that the length of one side is 5 mm or more and 60 mm or less and the thickness is 1 mm or more and 5 mm or less.

The electroacoustic transducer 3 is composed of a piezoelectric body having a bimorph structure. The electroacoustic transducer 3 has a structure in which a plurality of polarized piezoelectric layers and a plurality of electrode layers are alternately stacked. The electroacoustic transducer 3 is subjected to bending vibration so that the one main surface and the other main surface are bent, thereby generating acoustic vibration. In addition, the electroacoustic transducer 3 is set in a rectangular parallelepiped shape having a length of 10 mm to 40 mm, a width of 1 mm to 30 mm, and a thickness of 0.3 mm to 5 mm, for example. The piezoelectric layer constituting the electroacoustic transducer 3 is made of, for example, a lead-free piezoelectric material such as lead zirconate, lead zirconate titanate, Bi layered compound, or tungsten bronze structure compound. The electrode layer constituting the electroacoustic transducer 3 is made of, for example, an alloy containing silver or palladium, or an alloy containing a ceramic component or a glass component in this alloy.

Such an electroacoustic transducer 3 can be produced, for example, by the following method. First, a binder, a dispersing agent, a plasticizer, and a solvent are added to the piezoelectric material powder and stirred to prepare a slurry, and the obtained slurry is formed into a sheet shape to prepare a green sheet. Next, a conductive paste is printed on the green sheet to form an electrode layer pattern, and the green sheet on which the electrode layer pattern is formed is laminated to produce a laminated molded body, which is then degreased and fired to a predetermined size. A laminated body is obtained by cutting. Next, a conductive paste for forming a surface electrode is printed and baked at a predetermined temperature, and then a direct current voltage is applied through the electrode layer to polarize the piezoelectric layer. In this way, the electroacoustic transducer 3 can be obtained.

The electroacoustic transducer 3 is provided on the vibrating body 8 via a joining member 7. The joining member 7 has a film shape, and has a thickness larger than the amplitude of the bending vibration of the electroacoustic transducer 3. Moreover, the joining member 7 is formed of a material that is softer and more easily deformed than the extending portion 2a, and has a smaller elastic modulus and rigidity such as Young's modulus, rigidity, and bulk elastic modulus than the extending portion 2a. That is, the joining member 7 can be deformed and is more easily deformed than the extending portion 2a. The joining member 7 is provided so as to surround the entire circumference of the electroacoustic transducer 3. By providing the joining member 7 so as to surround the entire circumference of the electroacoustic transducer 3, the connection strength between the electroacoustic transducer 3 and the vibrating body 8 can be improved. It can be made difficult to peel. Furthermore, the vibration of the electroacoustic transducer 3 can be efficiently transmitted to the vibrating body 8.

As shown in FIG. 5, the bonding member 7 has a three-layer structure including two

adhesive layers

71 a and 71 b and a base layer 72 disposed therebetween. The lower surface (adhesive layer 71 a) of the bonding member 7 is fixed to the upper surface of the vibrating body 8, and the upper surface (adhesive layer 71 b) of the bonding member 7 is entirely connected to the lower surface of the electroacoustic transducer 3. It is fixed.

The

adhesive layers

71a and 71b are made of a viscoelastic body, and the thickness thereof is set to, for example, 10 μm or more and 30 μm or less. The viscoelastic body constituting the

adhesive layers

71a and 71b is made of a polymer material such as acrylic resin, silicon or urethane rubber.

The base layer 72 has higher rigidity than the

adhesive layers

71a and 71b, and the thickness thereof is set to, for example, 50 μm or more and 200 μm or less. The base layer 72 can be configured by suitably using a resin such as polyester. For example, it is desirable that the base layer 72 is configured by a viscoelastic body and a nonwoven fabric that form the

adhesive layers

71a and 71b.

The base layer 72 is preferably composed of a nonwoven fabric and an adhesive material, more specifically, the nonwoven fabric is impregnated with an adhesive material. It is desirable that at least a part of the base layer 72 is formed of a viscoelastic body over the entire thickness direction (direction from one of the two

adhesive layers

71a and 71b to the other). Thereby, both the effect of relieving the thermal stress acting between the vibrating body 8 and the electroacoustic transducer 3 and the effect of transmitting the vibration of the electroacoustic transducer 3 to the vibrating body 8 can be enhanced.

The transmission member 4 transmits the acoustic vibration generated from the electroacoustic transducer 3. When the transmission member 4 is applied to the ear, the transmission member 4 can satisfactorily transmit sound to the inner ear via the cartilage. Specifically, with the insertion portion 2 fitted in the external auditory canal, a part contacts the vicinity of the tragus and transmits acoustic vibrations to the cartilage and skin near the tragus.

The transmission member 4 is a cover member that is provided on the side surface of the insertion portion 2 and surrounds the extending portion 2a, and the electroacoustic conversion element 3 is incorporated therein. The transmission member 4 is coated with a resin such as an epoxy resin, an acrylic resin, silicon or urethane rubber. Further, the position of the transmission member 4 is adjusted by the user according to the shape of the ear.

The transmission member 4 is connected to an electrical wiring 9 through which a signal for controlling the electroacoustic transducer 3 is transmitted. One end of the electrical wiring 9 is connected to the transmission member 4. The other end of the electric wiring 9 is electrically connected to an electric circuit that controls the electroacoustic transducer 3 and a power source that supplies power to the electroacoustic transducer 3. The electrical wiring 9 is connected to a wire that is electrically connected to the electroacoustic transducer 3.

The vibration member 5 is provided on the inner surface of the insertion portion 2 through an adhesive, for example. The vibration member 5 can vibrate upon receiving acoustic vibration from the electroacoustic transducer 3. The vibration member 5 transmits the vibration of the electroacoustic transducer 3 to the extending portion 2a and is transmitted to the fitting member 2 through the extending portion 2a. And the vibration member 5 located in the inner surface of the insertion part 2 is vibrated. The vibration member 5 has a shape that fits into the through hole T and has the same size as the inner diameter of the insertion portion 2. For example, the vibration member 5 has a diameter of 3 mm to 15 mm and a thickness of 5 mm to 30 mm.

Further, the vibration member 5 is provided near either one end or the other end of the insertion portion 2. Then, when one of the insertion portions 2 on the side where the vibration member 5 is provided is fitted into the ear canal, the vibration of the vibration member 5 vibrates the air in the through hole T of the insertion portion 2 and the air conduction sound is generated in the eardrum in the ear canal. Can be vibrated. In addition, the vibration member 5 is comprised from vibration films, such as carbon, a liquid crystal polymer film, or a carbon nanotube, for example. The vibrating member 5 may be configured in a mesh shape so that external sound can be easily transmitted to the eardrum.

Furthermore, the external sound vibrates the air in the through hole T of the insertion portion 2 and further vibrates the vibration member 5. And the vibration of the vibration member 5 vibrates the air in the through-hole T of the insertion part 2, and an air conduction sound can vibrate the eardrum in the ear canal. It should be noted that one end of the insertion portion 2, which is the side where the vibration member 5 of the insertion portion 2 is close, is used by fitting it to the ear canal. However, to adjust the sound, the other end of the insertion portion 2 is fitted to the ear canal and used. May be.

The hook member 6 is attached to the auricle and is located between the back side of the auricle and the temporal region. The hook member 6 is formed so as to match the shape of the auricle, and a member that matches the shape and size of the user's ear is used. The hook member 6 has a portion in contact with the base of the auricle that is curved along the shape of the base of the auricle. The hook member 6 can be provided on the back side of the ear, and most of the hook member 6 can be hidden from the front side of the ear from the outside. The surface of the hooking member 6 may be provided with unevenness. By providing the unevenness, it is possible to reduce the portion that comes into contact with the user's ear, suppress the external auditory canal from being steamed, and reduce discomfort.

The hook member 6 is made of an elastically deformable plastic, and its surface is covered with a resin. The resin is an epoxy resin, an acrylic resin, silicon, urethane rubber, or the like, and is made of a material that does not adversely affect the human body. By coating the surface of the hooking member 6 with a resin, it is possible to reduce friction with the ear when it is worn on the ear, and fit the ear so that it can be used for a long time.

One end of the hook member 6 extends to the earlobe (earlobe) side. The other end of the hooking member 6 extends to the front side of the auricle. The other end of the hooking member 6 is provided with a transmission member 4 incorporating the electroacoustic transducer 3.

In the earphone 1 according to the present embodiment, a part of the transmission member 4 positioned outside the ear canal comes into contact with the tragus in a state where the insertion portion 2 is fitted to the ear canal and used. By inserting the insertion portion 2 into the external auditory canal, the insertion portion 2 is not easily detached even by the movement of a person's vertical motion, and can be satisfactorily fixed to the auricle. Further, as compared with a structure in which the insertion portion 2 itself vibrates greatly, the insertion portion 2 itself does not vibrate greatly, and the possibility of rubping off the surface of the ear canal and gradually falling off can be reduced. Furthermore, the electroacoustic transducer 3 is built in the transmission member 4 that contacts the tragus, and the transmission member 4 itself is vibrated, thereby realizing a structure in which the insertion portion 2 is less likely to vibrate.

In addition, the earphone 1 according to the present embodiment can be satisfactorily received by the transmission member 4 coming into contact with the tragus in a state where the hook member 6 is hooked on the ear and the insertion portion 2 is further fitted to the ear canal. Can continue to be fixed. Compared to a structure in which the insertion portion 2 is simply fitted to the ear canal, the hooking member 6 hooked on the auricle is provided, and the insertion portion 2 is further fitted to the ear canal so that the earphone 1 is not easily detached from the auricle. it can.

Furthermore, in the state where the through hole T of the insertion portion 2 is provided and the insertion portion 2 is fitted in the ear canal, the person can hear the surrounding sound without being completely blocked by the insertion portion 2. Listening to music while listening to music. Further, since the user of the earphone 1 is provided with the through-hole T in the insertion portion 2, it is possible to make it difficult to feel a sense of blockage due to blockage of the ear canal, and to hear surrounding sounds. .

Further, a battery or an electric circuit may be provided in the hooking member 6 to be hooked on the ear. When a battery or an electric circuit power source is provided in the hooking member 6, it is not necessary to extend the wiring from an external power source or the like, and the user can act freely to make it easier to use the earphone 1.

Further, it is preferable to use a piezoelectric element as the electroacoustic transducer 3. When the piezoelectric element is used, unlike the bone conduction speaker, the acoustic vibration generated by the piezoelectric element can be small. Therefore, even if the electroacoustic transducer 3 is disposed in the vicinity of the tragus, the user's face does not vibrate excessively, and the skull can be made difficult to vibrate. As a result, even if the user uses it for a long time, there is little possibility that a headache will occur, and it can be used comfortably for a long time.

It should be noted that the present invention is not limited to the above-described embodiment, and various changes and improvements can be made without departing from the gist of the present invention. Hereinafter, modifications of the embodiment of the present invention will be described. Note that, among the earphones according to the modified example of the embodiment of the present invention, the same parts as those of the earphone according to the embodiment of the present invention are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

<Modification 1>
6 and 7 are cross-sectional views of the earphone 1x according to the first modification, and correspond to the cross-section of FIG. FIG. 6 shows a state where the vibration member 5 closes the through hole T of the insertion portion 2. FIG. 7 shows a state in which the vibration member 5 has opened the through hole T of the insertion portion 2. In the embodiment described above, the vibration member 5 is fixed to the inner surface of the insertion portion 2, but is not limited thereto. The earphone according to the first modification is provided on the inner surface of the insertion portion 2 so as to be opened and closed.

The earphone 1x according to the first modification has a structure in which the transmission member 4 is provided with a button 4a that is slidable with respect to the outer surface of the transmission member 4. One end of the vibration member 5 can be opened and closed via, for example, a hinge 5a, and the other end of the vibration member 5 is provided with a line 5b such as a string or a string. Further, the line 5b is connected to the button 4a, and the line 5b is pulled according to the movement of the button 4a, so that the vibrating member 5 opens and closes around the hinge 5a. In addition, force is applied to the vibration member 5 so as to keep the open state in a direction of opening the through hole T of the insertion portion 2 by a spring.

The person adjusts the open / closed state of the vibration member 5 so that the size and quality of the air conduction sound transmitted to the eardrum can be adjusted. Then, by adjusting the change of the external sound through the through hole T of the insertion portion 2 and the vibration member 5, it is possible to adjust the external sound in a concentrated manner, and the electroacoustic transducer 3 performs acoustic vibration. You can concentrate on listening to the sound converted to, and improve the degree of freedom of specification. In the first modification, the button 4a has a sliding structure. However, the present invention is not limited to this. For example, the opening / closing state of the vibration member 5 may be adjusted according to the length of the button pressed.

<Modification 2>
8 and 9 are cross-sectional views of the earphone 1y according to the second modification, and correspond to the cross-section of FIG. 8 and 9 show a structure in which one end of the insertion portion 2 can rotate around an axis along the penetration direction of the through hole T. FIG. FIG. 8 shows a state in which the adjustment plate 10 closes the through hole T of the insertion portion 2 instead of the vibration member 5. FIG. 9 shows the adjustment plate 10 in a state where the through hole T of the insertion portion 2 is opened. In the first modified example described above, the vibration member 5 itself is configured to open and close, but is not limited thereto. The earphone 1y according to the second modification is provided with a semi-disc vibration member 5 and a semi-disc adjustment plate 10 in place of the single disc disc vibration member 5. The adjustment plate 10 has the same function as that of the vibration member 5, is a part of the vibration member 5, and can vibrate upon receiving acoustic vibration from the electroacoustic transducer 3.

The earphone 1y according to the second modification has a structure in which one end of the insertion portion 2 can be rotated around the axis of the through hole T. A semicircular plate is provided on the inner surface of one end of the rotatable insertion portion 2, and a semicircular plate is provided on the inner surface of a region sandwiched between both ends of the fixed insertion portion 2, and both are used as the adjustment plate 10. By rotating one end of the insertion portion 2, the semicircular plate is rotated, and an external sound transmitted in the through hole T of the insertion portion 2 is adjusted by adjusting a region overlapping with the other semicircular plate. be able to. The adjustment plate 10 is made of the same material as that of the vibration member 5.

10 and 11 are cross-sectional views of a structure that specifically realizes the earphone 1y according to the second modification. 10 and 11 show a structure in which one end of the insertion portion 2 can rotate around an axis along the penetration direction of the through hole T. FIG. FIG. 10 shows a state where the space on the through hole T side and the space on the eardrum side are separated by the vibrating member 5 and the adjustment plate 10. FIG. 11 shows a state where the space on the through hole T side and the space on the eardrum side are connected by rotating the adjustment plate 10 about the axis along the through direction of the through hole T. That is, the vibration member 5 (adjustment plate 10) is provided so as to divide the space in the insertion portion 2, and the adjustment plate 10 as a part of the vibration member 5 divides the space in the insertion portion 2. It can be moved to connect or connect.

In this specific example, the insertion portion 2 is divided into two members and both are movable relative to one. Moreover, the ear cushion 11 is provided so that the part which contacts the inner ear of an auricle among the ends of the insertion part 2 may be covered. The ear cushion 11 is made of a material that does not damage the human auricle, such as urethane, silicone, or rubber. The ear cushion 11 is formed with an open hole TR that can connect the space on the eardrum side and the space in the insertion portion 2 along the through direction of the through hole T. The opening diameter of the opening hole TR is set to, for example, 5 mm or more and 10 mm or less.

Here, the insertion part 2 connected to the transmission member 4 in the insertion part 2 is referred to as a first insertion part 21. The second insertion portion 22 is provided by being inserted inside the first insertion portion 21. The second insertion portion 22 is provided to the first insertion portion 21 so as not to come out from the inside of the first insertion portion 21 via the fitting member 12 provided inside the first insertion portion 21. .

Part of the fitting member 12 is attached along the outer edge circle of the insertion portion 2. The fitting member 12 is fitted in a groove provided on the inner surface of the first insertion portion 21 and is fitted in a groove provided on the outer peripheral surface of the second insertion portion 22. The second insertion portion 22 can move with respect to the first insertion portion 21 via the fitting member 12. The fitting member 12 is made of, for example, plastic or resin.

Of the end portions of the second insertion portion 22, the end portion 22 a on the side where the ear cushion 11 is not provided projects outward from the space inside the first insertion portion 21. And the overhang | projection part 22a can be pinched with a human hand, and the overhang | projection part 22a can be rotated centering on the axis | shaft along the penetration direction of the through-hole T. FIG. That is, the other end of the insertion portion 2 can rotate around an axis along the penetration direction of the through hole T of the insertion portion 2, and a part of the vibration member 5 can be obtained by rotating the other end of the insertion portion 2. The adjustment plate 10 is movable.

As shown in FIG. 10 or FIG. 11, a sponge 13 is provided in the transmission member 4. The electroacoustic transducer 3 is connected to the sponge 13 via the joining member 7. In addition, the electroacoustic transducer 3 has a surface that is not connected to the bonding member 7 and a space between the inner surface of the transmission member 4. A gap P is provided between the inner surface of the transmission member 4 and the electroacoustic transducer 3. The sponge 13 is made of, for example, urethane sponge or polyethylene sponge. The sponge 13 is, for example, a size capable of mounting the electroacoustic conversion element 3. For example, the length is 10 mm to 40 mm, the width is 1 mm to 30 mm, and the thickness is 0.3 mm to 5 mm. It is set to a rectangular parallelepiped shape.

The electroacoustic transducer 3 is mounted on the sponge 13 via the joining member 7 and one main surface of the electroacoustic transducer 3 is exposed in the gap P, so that the electroacoustic transducer 3 is restrained by surrounding members. It becomes difficult to be done. This is because one main surface of the electroacoustic transducer 3 is exposed in the gap P, and the other main surface of the electroacoustic transducer 3 is exposed to the sponge 13 via the joining member 7 that is more easily deformed than the transmission member 4 itself. Therefore, the electroacoustic transducer 3 is easily deformed according to the electric signal. And the electroacoustic transducer 3 can vibrate greatly according to an electric signal, and a vibration sound can be enlarged. And it can be made easy to transmit a sound to the eardrum through the transmission member 4 or the vibration member 5 so that a vibration sound is large.

The earphone 1y according to this modification is provided so that the adjustment plate 10 is movable in a state of being fitted to the ear canal. The space on the through hole T side and the space on the eardrum side can be separated or connected by the vibrating member 5 and the adjustment plate 10.

In a state where the ear cushion 11 is fitted in the ear canal and the space on the through-hole T side and the space on the eardrum side are separated, the acoustic vibration generated by the transmission member 4 is transmitted through the insertion portion 2 and the vibration of the adjustment plate 10. This is transmitted to the member 5, and the adjusting plate 10 and the vibrating member 5 are vibrated. The air conduction sound can be generated by the vibration member 5 and transmitted to the eardrum in the ear canal. In a state where the ear cushion 11 is fitted in the ear canal, a slight gap is provided between the eardrum and the vibrating member 5, and sound is confined between the eardrum and the vibrating member 5 through the gap to facilitate resonance. Can generate bass. Therefore, according to the earphone 1y according to the present modification, the vibration member 5 is provided so as to block the eardrum, and a slight gap is created between the eardrum and the vibration member 5, so that a bass sound of 1 kHz or less can be easily resonated. can do.

Further, when the adjustment plate 10 is moved so that the space on the through hole T side and the space on the eardrum side are connected, the opening hole TR of the ear cushion 11 connected to the through hole T as the space in the insertion portion 2 is provided. You can pass outside sounds to the eardrum. As a result, when the earphone 1y is used, the sound can be transmitted to a person by transmitting both the air conduction sound due to the acoustic vibration and the external external sound to the eardrum.

In the earphone 1y according to this modification, it is further preferable that a part of the transmission member 4 located outside the ear canal is in contact with the tragus in a state where the ear cushion 11 is fitted to the ear canal. The vibration of the transmission member vibrates the tragus and is transmitted to the cochlea via the ear cartilage and converted into sound. Further, when the vibration of the transmission member 4 is transmitted to the insertion portion 2 and the insertion portion 2 vibrates, the transmitted vibration vibrates the surface of the ear canal, and air conduction sound is generated on the surface of the ear canal and reaches the eardrum. .

In addition, when a piezoelectric element is used as the electroacoustic transducer 3, the acoustic vibration generated by the piezoelectric element can be reduced unlike the bone conduction speaker. Therefore, even if a piezoelectric element is disposed in the vicinity of the tragus, the user's face does not vibrate excessively, and the skull can be made difficult to vibrate. As a result, even if the user uses it for a long time, there is little possibility that a headache will occur, and it can be used comfortably for a long time.

<Modification 3>
FIG. 12 is a cross-sectional view of the earphone 1z according to the third modification, and corresponds to the cross section of FIG. In FIG. 12, the vibration member 5 z may have a shape in which a triangular pyramid portion having a hollow inside and a cylindrical portion 5 zb extending from the top of the triangular pyramid portion 5 za are combined. That is, the vibrating member 5z may have a trumpet shape. The internal space of the triangular pyramid portion 5za and the internal space of the cylindrical portion 5zb are connected.

The vibration member 5z is connected to a part of the inner surface of the insertion portion 2 through, for example, an adhesive. The vibration member 5z can vibrate upon receiving acoustic vibration from the electroacoustic transducer 3. The vibration member 5z has a size such that a part of the outer edge of the triangular pyramid portion 5za fits into the through hole T, and has the same size as the inner diameter of the insertion portion 2. The vibration member 5z has an inner diameter of 1 mm to 3 mm, an outer diameter of 1.5 mm to 4.3 mm, and a length along the insertion portion 2 of 10 mm to 20 mm. ing. The vibrating member 5z is made of, for example, a resin material such as polycarbonate resin, acrylic resin, polyacetate resin, or polyvinyl chloride resin, or a metal material such as aluminum, copper, or iron.

FIG. 13 and FIG. 14 are the sound pressure level characteristics of the viewing sound source and the peripheral sound evaluation results for the earphones according to the third modification, respectively. As for the sound pressure level characteristics of the audio source, earphones were attached to a dummy head placed in a cooperative box where it was difficult for sound to resonate, and sound waves of each frequency were emitted from the earphones. The sound detected by the condenser microphone in the dummy head was evaluated as the sound of the viewing sound source viewed by the earphone wearer. Each frequency from the earphone is 100 Hz to 10000 Hz.

On the other hand, the peripheral sound evaluation was performed by preparing a dummy head with earphones in an anechoic box where sound does not easily resonate, and emitting sound waves of each frequency from the speakers in the anechoic box. The sound detected by the condenser microphone in the dummy head was evaluated as an outer peripheral sound that the earphone wearer can hear. Each frequency from the speaker is 100 Hz to 10000 Hz.

FIG. 13 shows the result of comparing the case where the earphone according to the third modification example has the internal space sp and the case without the internal space sp. A case where the internal space sp is present is indicated by a solid line, and a case where the internal space sp is not present is indicated by a broken line.

A part of the insertion part 2 is cylindrical, and a part of the vibration member 5z is a triangular pyramid part 5za, so that an internal space is formed between the inner surface of the insertion part 2 and the side surface of the triangular pyramid part 5za. sp is formed. By providing the internal space sp, as shown in FIG. 13, when the frequency is 200 Hz to 2000 Hz and the internal space sp is present, the sound pressure level is higher than when the internal space sp is not present. It has been shown that a so-called low frequency sound pressure level remains high. As a result, the earphone according to the present modification provided with the internal space sp has good sound pressure characteristics in a low frequency region having a frequency of about several hundreds, and can clearly view voice / music. The internal space sp also extends between the cylindrical portion of the vibration member 5z and the side surface of the columnar portion 5zb.

FIG. 14 shows three earphones. What is indicated by a solid line is an evaluation result of the earphone 1z according to the present modification. What is indicated by a broken line is that the shape of the end portion on the outside world side of the through hole T remains as a thin tube although the through hole T is present. What is indicated by a long broken line is an evaluation result of the closed type earphone in which the through hole T is not provided and the hole is closed.

As shown in FIG. 14, the closed-type earphone has a low sound pressure level at each frequency, indicating that it is difficult to hear the peripheral sound. When the outer peripheral sound is heard in a state where the vibration member 5z is removed from the earphone according to this modification, it is easier to hear external sound than the closed-type earphone. Furthermore, it is shown that the earphone 1z according to this modification has an improved sound pressure level at a frequency of 500 Hz to 4000 Hz by providing the vibration member 5z. As a result, the earphone 1z according to the present modified example is provided with the vibrating member 5z rather than the closed-type earphone or the through-hole T, but the shape of the outer side end portion is a thin tube and the vibrating member 5z is not provided. It is easier to hear the peripheral sound.

In this modification, the electrical wiring 9 is routed so as to be taken out from the base of the transmission member 4. By connecting the electrical wiring 9 closer to the insertion portion 2 with respect to the electroacoustic conversion element 3, the vibration of the electroacoustic conversion element 3 is less likely to be disturbed, and can be easily vibrated closer to the insertion portion 2. The acoustic vibration can be efficiently transmitted from the member 4 to the insertion portion 2. As a result, the sound pressure level can be maintained satisfactorily. As shown in FIG. 15, the electrical wiring 9 may be drawn from the base of the transmission member 4 in the above-described embodiment or modification.

According to this modified example, by providing the vibration member 5z, it is possible to easily hear the sound of the surrounding environment (outer peripheral sound) while maintaining the state where the external auditory canal is open to the outside. In addition, the sound pressure level in the low frequency region, which is a problem with the piezoelectric method, is improved with the external auditory canal open to the outside where the sound pressure level characteristics of the normal low frequency region are reduced. , Music, etc.).

Claims

A cylindrical insertion part for inserting one end into the ear canal,
An electroacoustic transducer that is provided on a part of the side surface of the insertion part and that comes into contact with the tragus in a state where the insertion part is inserted into the ear canal and that generates acoustic vibration in response to an electrical signal is incorporated. A transmission member,
An earphone comprising: a vibration member that is provided on an inner surface of the insertion portion and vibrates in response to acoustic vibration from the electroacoustic transducer.
The earphone according to claim 1,
The earphone is characterized in that the vibration member is provided near either one end or the other end of the insertion portion.
The earphone according to claim 1 or 2,
The transmission member has an extending part extending from a side surface of the insertion part in a direction orthogonal to the axis of the insertion part, and the electroacoustic transducer is provided in the extension part via a joining member. Earphones characterized by being.
The earphone according to any one of claims 1 to 3,
The vibration member is provided so as to divide a space in the insertion portion, and a part of the vibration member is movable to divide and connect the space in the insertion portion. .
The earphone according to claim 4,
The other end of the insertion portion is rotatable about an axis along the penetration direction of the through hole of the insertion portion, and the other end of the insertion portion rotates to move a part of the vibration member. Earphone characterized by that.
The earphone according to claim 1,
The vibration member has a shape in which a triangular pyramid having a hollow interior and a columnar portion extending from the top of the triangular pyramid, and an internal space of the triangular pyramid. An earphone characterized by being connected to the internal space of the cylindrical portion.
The earphone according to any one of claims 1 to 6,
The earphone according to claim 1, wherein the transmission member is provided with an elastically deformable hooking member that is hooked on the auricle.