JP6253162B2 - Bone conduction earphone and its assembly method - Google Patents

Description

  The present invention relates to a bone conduction earphone that is extremely easy to assemble and can realize cost reduction.

  Earphones can be used without being inserted into the ear canal separately from conventional earphones that are generally inserted into the ear canal to close the ears, and those that are bone conduction type that also close the ear. It is roughly classified into a bone conduction earphone.

  Examples of the former earphone include those described in Document 1 (Magnetic Earphone Type) and Document 2 (Piezoelectric Type).

  Moreover, as the latter earphone, for example, there is one such as document 3 (so-called outer casing type).

  In the former former earphone, the earphone is inserted into the ear canal at the time of use. Therefore, since the ear canal is blocked, the ear canal is compressed and feels uncomfortable and tired when used for a long time, because there is no breathability, sweating and feeling uncomfortable, isolated from the outside world, so isolated There are problems such as feeling mental and physical burdens such as feelings, difficulty in hearing alarm sounds in danger, and lack of safety.

  On the other hand, the latter type is used by being brought into contact with the head or being placed around the ear without being inserted into the ear canal. Thus, it does not compress the ear canal, unlike the former type.

  However, the latter type has a structure in which earphones are provided at both ends of the hanger portion of the headband made of an elastic member, and the headband is attached to the head for use. Assembly is cumbersome and expensive. Since the mounting device is large and heavy, it requires physical strength, and the head is pressed during mounting, so there is a feeling of pressure and it tends to get tired if worn for a long time. There were a number of issues, such as taking up space during storage.

  As a solution to such a problem, as shown in Document 4, the headband is eliminated and the external ear canal is inserted into a compact and simple type, while being communicated with the outside world to provide air permeability and at the time of wearing. There is an open-type bone conduction earphone that eliminates the feeling of pressure.

JP-A-50-151134 JP 2009-111820 A JP 2009-049844 A JP 2012-044245 A

  The thing of the literature 4 makes the outside and the eardrum side communicate with each other through the vent, and does not block the ear canal at the time of wearing. Further, since it is not cut off from the outside world, it is possible to reduce the feeling of isolation and physical burden, and also to sense the alarm sound at the time of danger, thereby avoiding personal danger. Further, it can be used for elderly people, hearing-impaired people, and the like, and even when used as a hearing aid, there is no relation between the microphone and the speaker, so that there is an effect that no howling occurs. In addition, the damper can be easily accommodated in the body of the coil bobbin during assembly, and the assemblability is good. Furthermore, since it can be used as a waterproof type, it can be used in heavy rain and water. In addition, since the movement including the magnet has mass (mass control), it has the advantage of easily transmitting vibrations directly to the bone, but the number of parts is slightly higher, so the cost is slightly higher. In addition, there is a problem that assembly is complicated.

  The present invention has been proposed in view of the above, and the object is to have a small number of parts, easy to assemble, can greatly reduce the cost, and can be fitted to the ear canal. It is an object of the present invention to provide a bone conduction earphone and an assembling method thereof.

In order to solve the above-mentioned problem, the invention according to claim 1 is directed to a vibrator 6, a damper 7, a coil 8, and a bag-like case from the bottom in the bag-like case 2 made of an elastic member toward the upper opening 2a '. 2 is provided, and the coil energization lead 3 is drawn out from the case 4, and the vibration of the vibrator 6 due to the energization is transmitted to the outside through the bag-like case 2. It is characterized by that.
According to a second aspect of the present invention, in the bone conduction earphone according to the first aspect, the bag-shaped case 2, the vibrator 6, the coil 8, and the vent hole 5 communicating with the central portion of the case 4 are formed. Features.
According to a third aspect of the present invention, in the bone conduction earphone according to the first aspect, the distal end portion 2e of the bag-like case 2 is bent with respect to the length direction of the bag-like case 2.
According to a fourth aspect of the present invention, in the bone conduction earphone according to the first aspect of the present invention, the bag-like case 2 is formed with a flange-like protruding portion 2A having at least one elasticity on the outer peripheral portion thereof. .
According to a fifth aspect of the present invention, in the bone conduction earphone assembling method, the vibrator 6 and the damper 7 are packed from one direction into the bag-like case 2 made of an elastic member, and the coil 3 is provided. It is characterized by assembling by assembling an assembly composed of a case 4 having a two-part structure composed of the derived first and second cases 9 and 10.
The invention according to claim 6 is the bone conduction earphone assembling method according to claim 5, wherein the coil wires 8 d and 8 e of the coil 8 are connected via contact pins 11 on the upper surface of the first case 9 constituting the case 4. Connected to the lead wires 3a and 3b of the lead 3, and the coil 8 is held by the cylindrical portion 9a 'of the first case 9, and the first case 9 is covered with the second case 10, It is characterized by being integrated by ultrasonic welding.

According to the first aspect of the present invention, since the number of main parts is as small as the bag-like case 2, the vibrator 6, the damper 7, the coil 8, and the case 4, the cost can be reduced, and the bag-like case 2 is elastic. Therefore, the vibrator 6 inside can freely move, and the vibration of the vibrator 6 can be efficiently transmitted to the outside through the bag-like case 2.
Further, according to the present invention described in claim 2, in addition to the above effects, since it has the vent hole 5, when it is attached to the ear canal, the outside and the eardrum side can be communicated and external information is blocked. There is no feeling of pressure when wearing.
Furthermore, according to the third aspect of the present invention, since the distal end portion is bent along the shape of the ear canal, vibration can be transmitted efficiently and communication can be performed.
According to the fourth aspect of the present invention, the degree of adhesion to the ear canal can be increased by the protruding portion 2A made of an elastic material even when the shape of the ear canal varies depending on individual differences and the ear canal is wide.
According to the fifth and sixth aspects of the present invention, since the parts are packed in the bag-like case 2 from one direction, the assembly is extremely easy, the productivity is excellent, and the number of parts is small. It can be planned.

1 shows a perspective view of one embodiment of the present invention. (A) is a plan view of the same, (b) is a side view, and (c) is a bottom view. AA line sectional view in Drawing 2 (a). The BB sectional view taken on the line in Fig.2 (a). The disassembled perspective view of the 1st, 2nd case used by this invention. Explanatory drawing which shows the connection of the lead wire and coil wire of this invention. Explanatory drawing which shows an assembly process. Explanatory drawing which shows the next assembly process. The perspective view of the other Example of this invention. (A) is a plan view of the same, (b) is a side view, and (c) is a bottom view. AA line sectional view in Drawing 10 (a). FIG. 10B is a sectional view taken along line BB in FIG.

  In FIG. 1, reference numeral 1 denotes a bone conduction earphone according to the present invention. This bone conduction earphone 1 includes a bag-like case 2 made of an elastic member such as silicon rubber or elastomer and having an elongated shape like a sock. In the bag-like case 2, a bone conduction device is accommodated. 3 is a lead that can be bent, as is well known, drawn out to the outside, and this lead 3 is from a lead lead-out portion 4a of the case 4 that functions as a lid provided in the upper opening 2a ′ of the bag-like case 2. Has been pulled out. The lead 3 is connected with coil wires 8d and 8e at the beginning and end of winding of the coil described later. Reference numeral 5 denotes a vent hole penetrating in the center of the case 4. The configuration of the bone conduction device will be described later.

  FIG. 2 (a) is a plan view of the bone conduction earphone 1. As shown in FIG. 2 (c), the vent hole 5 of the case 4 extends through the tip of the bag-like case 2, and the bone conduction earphone is opened. It is a hole type.

  FIG. 2B is a side view, and in the state shown in the figure, the bag-like case 2 has a stepped shape in which the outer shape gradually spreads outward from approximately the center to the upper part. The reason for forming the step shape is that it corresponds to the shape of each component housed inside. That is, the upper portion forms the first diameter portion 2a having the largest diameter, and the second diameter portion 2b, the third diameter portion 2c, and the fourth diameter portion 2d become smaller in diameter toward the tip portion.

  The angle α with respect to the longitudinal axis direction O extending linearly from the first diameter portion 2a to the center portion of the fourth diameter portion 2d of the tip end portion 2e of the fourth diameter portion 2d is an angle of about 30 degrees. It is bent within the range. There are differences in the shape of the ear canal. If you create a degree of freedom in the lateral direction with a length of 2 to 3 mm with respect to the longitudinal direction of the ear canal, the degree of correspondence will increase, so you can bend the tip, transmit vibrations efficiently, and communicate I made it. In addition, you may form in substantially linear form, without making it bend.

  FIG. 2 (c) is a bottom view of the bone conduction earphone 1. The vent hole 5 opened from the bottom surface is bent with respect to the upper vent hole 5 (shown by a broken line) because the distal end portion 2e of the bag-like case 2 is bent. You can see that In addition, the front-end | tip part 2e is tapering toward the front-end | tip, as shown in FIG.2 (c). This is because it is easy to insert into the ear canal.

  FIG. 3 is a sectional view showing the internal structure of the bone conduction earphone 1. The inner portion of the inclined tip portion 2e of the bag-like case 2 is filled with an elastic member and becomes a thick portion 2e 'as shown by hatching except for the vent hole 5. A vibrator 6 made of a magnet is provided on the upper surface of the thick portion 2e ', in other words, on the bottom of the bag-like case 2.

  A ring-shaped damper 7 is preferably disposed on the top of the vibrator 6. The damper 7 is made of an elastic member such as silicon rubber, like the bag-like case 2.

  A coil 8 is provided on the vibrator 6 via the damper 7 and is provided over the second and third diameter portions 2b and 2c. The coil 8 is configured by winding a winding 8a around a bobbin body 8c having flanges 8b formed at both ends. 8d is a coil wire at the start or end of winding of the winding 8a, and this coil wire 8d is connected to lead wires 3a and 3b in the lead 3 (see FIG. 6 described later). This will be explained again later. The upper opening 2 a ′ of the bag-like case 2 is closed by the case 4. This case 4 has a two-part structure of first and second cases 9 and 10, and a first case 9 having a diameter slightly larger than the coil diameter is provided above the coil 8. The first case 9 is in contact with the upper flange 8b of the coil 8 and has a cylindrical portion 9a 'positioned outside the flange 8b and in contact with the outer peripheral portion of the coil 8. The cylindrical portion 9a' keeping.

  On the first case 9, a second case 10 having the same diameter as the first case 9 is provided. The first and second cases 9 and 10 are provided in the first diameter portion 2 a above the bag-like case 2.

  As shown in detail in FIG. 4, a ring-shaped recess 9 a is formed on the outer periphery of the upper surface of the first case 9. The second case 10 has a convex portion 10a that fits into the concave portion 9a of the first case 9, and leads connected to the coil wire 8d and the like from the lead lead-out portion 4a formed in the second case 10. 3 is pulled out (see FIGS. 1 and 3). The first and second cases 9 and 10 are integrated by ultrasonic welding by fitting the concave portions and the convex portions together and bringing them together. As a result, the coil wire and the lead wire are connected. In FIG. 4, reference numeral 11 denotes a contact pin that electrically connects the coil wire 8d and the lead 3 shown in FIG.

  FIG. 5 shows the first case 9 in which the tip of the lead 3 is set, the short round pin-shaped contact pin 11 accommodated in a predetermined position of the first case 9, and the first case 9. An exploded perspective view of the second case 10 is shown.

  As shown in FIG. 5, the coil wire lead-out hole a is formed in a part of the inner side of the concave portion 9a formed on the outer peripheral portion of the upper surface of the first case, and the lead tip storage portion 9b is in a linear position on the opposite side. Is formed. And the contact pin accommodating part 9c which consists of an elongate rectangular recessed part is formed in those both side positions. A contact pin 11 made of a conductive material is accommodated therein.

  In FIG. 5, 3 a ′ and 3 b ′ are portions connected to the contact pins 11 of the two lead wires 3 a and 3 b housed in the lead 3. The insulated lead wires 3a and 3b are guided to the contact pin storage portions 9c on both sides through the guide grooves, respectively, and the rectangular shape of the outer peripheral wall 9d erected on the outer periphery of the first case 9 in a flange shape. It is pulled out from the notch 9e.

  Further, as shown in FIG. 6, the coil wires 8d and 8e drawn from the coil wire lead-out hole a to the upper surface side or the lower surface side also pass through the contact pin storage portion 9c through the guide groove and are drawn out from the notch 9e. The In this state, the conductive contact pin 11 is set on the lead wires 3a and 3b and the coil wires 8d and 8e.

  Returning to FIG. 5 again, in this state, the second case 10 is put on the first case 9 while pulling the lead wires 3a, 3b and the coil wires 8d, 8e led out from the notch 9e, for example, with a finger. In this case, since the positioning engagement piece 10c that engages with the notch 9e is formed on the outer periphery of the second case 10, the second case 10 is located at a predetermined position with respect to the first case 9. Can be put on.

  Thereafter, the first and second cases 9 and 10 can be integrated in the process of ultrasonic welding. Further, the lead wires 3 a ′ and 3 b ′ of the lead wires 3 a and 3 b and the coil wires 8 d and 8 e can be connected via the contact pins 11. Moreover, the excess line exposed from the notch 9a is cut.

  As shown in FIGS. 3 and 4, the case 4 composed of the integrated first and second cases 9 and 10 is made elastic so that the first diameter portion 2 a at the upper part of the bag-like case 2 having elasticity is elastic. It is arranged to be pushed outward and inserted inside. After the insertion, when the force spread is released, the first diameter portion 2a of the bag-like case 2 is contracted by the restoring force, and the case 2 is tightened.

  Further, a locking portion 2 a ″ that fits into a recess 10 b formed in the outer peripheral portion of the upper surface of the second case 10 is formed on the inner peripheral portion of the opening of the bag-like case 2, and the case 4 is pulled out from the bag-like case 2. Is configured to not.

  In this way, the vibrator 6, coil 8, case 4, etc. in the bag-like case 2 are in close contact with the inner peripheral surface of the bag-like case 2 inside the bag-like case 2, and are firmly integrated by the tightening force. Is done.

  7 and 8 show the assembly process. First, as shown in FIG. 7, the vibrator 6 and the damper 7 are inserted into the bottom of the bag-like case 2 from one direction so as to be packed.

  Next, as shown in FIG. 8, the coil wires 8d and 8e of the coil 8 are brought into contact with the lead wires 3a and 3b via the contact pins 11 as described above, and the coil 8 is held by the cylindrical portion 9a ′. If an assembly in which the second cases 9, 10 and the like are integrated is housed in the bag-like case 2, the bone conduction earphone can be assembled very easily. In this case, as described above, the coil 8 is brought into close contact with the inner peripheral surface of the bag-like case 2. For this purpose, the inner diameter of the second diameter portion 2b of the bag-like case 2 may be slightly smaller than the outer diameter of the coil 8. Since the bag-like case 2 has elasticity and can be expanded and contracted, it can be brought into close contact.

  In use, the bone conduction earphone 1 is inserted into the ear canal. In this case, since the bag-like case 2 is made of an elastic member, the touch to the ear canal is good and fits. Further, since the distal end portion 2e is bent, it can be inserted along the ear canal. In this state, when an alternating audio current flows to the coil 8 through the lead 3, the magnetic flux alternately changes according to the direction of the current according to the law of the right-hand screw of amperes. Ampere's right-handed screw law is a law that expresses the relationship between current and the magnetic field around it. When a current is passed, the direction of the current is the direction of the right-handed screw, and a magnetic field is generated in the direction of the right-handed screw.

  Further, the force F generated by Fleming's left-hand rule acts on the vibrator 6. Since the damper 7 is made of an elastic material, the vibrator 6 can freely move in the bag-like case 2 having elasticity and vibrates, and the vibration is efficiently transmitted to the ear canal via the bag-like case 2 made of an elastic member. The vibration is transmitted to the auditory nerve after the cochlea from the ear ossicles behind the ear canal and recognized as sound by the brain. This allows you to listen to the sound.

  Further, the bone conduction earphone 1 is provided with a vent hole 5 toward the eardrum, so that the bone conduction earphone 1 has an open type, so there is no feeling of pressure, and the external airway sound enters the ear canal as vibration of the air and the eardrum vibrates. It is transmitted to the auditory organ called the cochlea and can recognize the sound.

  It should be noted that a waterproof lid-like plug (not shown) that prevents water from entering the inside of the vent hole 5 is detachable, and if the vent hole 5 is provided with a plug, the bone conduction earphone 1 can be used as an ear plug. Can be used comfortably even in water.

  9 to 12 show a second embodiment of the present invention.

  This embodiment is characterized in that at least one or more hook-shaped protrusions 2A are formed on the outer peripheral portion of the bag-like case 2 at intervals. This protrusion 2A is one of means for increasing the efficiency of vibration transmission.

  The protruding portion 2A has a convex curved surface provided toward the tip of the bag-like case and is made of a material having the same elasticity as that of the bag-like case 2 and can be deformed.

  The size of the ear canal varies among individuals. Therefore, if the deformable protrusion 2A is formed in the bag-like case 2 as in this embodiment, the protrusion 2A can be securely fitted according to the shape of the ear canal, and the vibration of the vibrator can be applied to the protrusion 2A. Via the ear canal.

  In the illustrated embodiment, three protrusions 2A are formed, but it goes without saying that the number may be increased or decreased as appropriate.

  Moreover, you may incline the front-end | tip part 2e of the bag-like case 2 like the said Example.

  Other configurations are the same as those of the above-described embodiment.

DESCRIPTION OF SYMBOLS 1 Bone conduction earphone 2 Bag-shaped case 2a 'Bag-shaped case opening part 2a''Locking part 2a 1st diameter part 2b 2nd diameter part 2c 3rd diameter part 2d 4th diameter part 2e Tip part 2e' Thick part 3 Lead 3a, 3b Lead wire 4 Case 4a Lead lead-out portion 5 Vent hole 6 Vibrator 7 Damper 8 Coil 8a Winding 8b Flange 8c Body portion 8d, 8e Coil wire 9 First case 9a 'Tube portion 9a Recess 9b Lead tip storage Portion 9c contact pin storage portion 9d outer peripheral wall 9e notch 10 second case 10a convex portion 10c engagement piece 11 contact pin a coil wire lead-out hole

Claims (6)

  The opening of the vibrator (6), the damper (7), the coil (8), and the bag-shaped case (2) from the bottom in the bag-shaped case (2) made of an elastic member toward the upper opening (2a ') A case (4) for closing (2a ′) is provided, and the lead (3) for energizing the coil is drawn out from the case (4), and the vibration of the vibrator (6) due to energization is caused by the bag-like case ( Bone conduction earphone characterized by being transmitted to the outside via 2).   The bone conduction earphone according to claim 1, wherein a vent hole (5) communicating with a central portion of the bag-like case (2), the vibrator (6), the coil (8), and the case (4) is formed. Bone conduction earphone characterized by that.   The bone conduction earphone according to claim 1, wherein a tip (2e) of the bag-like case (2) is bent with respect to a length direction of the bag-like case (2).   The bone-conduction earphone according to claim 1, wherein the bag-like case (2) has at least one hook-shaped protrusion (2A) having elasticity on the outer peripheral portion thereof.   In the bag-like case (2) made of an elastic member, the vibrator (6) and the damper (7) are packed from one direction, the coil (8) is provided, and the lead (3) is led out first, A method for assembling a bone conduction earphone, comprising assembling and assembling an assembly comprising a case (4) having a two-part structure comprising a second case (9, 10).   The bone conduction earphone assembly method according to claim 5, wherein the coil wires (8d, 8e) of the coil (8) are contact pins (11) on the upper surface of the first case (9) constituting the case (4). The lead (3) is connected to the lead wires (3a, 3b) via the coil (8), and the coil (8) is held by the cylindrical portion (9a ') of the first case (9). A method for assembling a bone conduction earphone, wherein the second case (10) is covered with (9) and integrated by ultrasonic welding.

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