JP2010087810A - Ear canal type bone conduction receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bone conduction receiver suitable for bearing in an ear canal. <P>SOLUTION: The ear canal type bone conduction receiver includes a piezoelectric vibrator, a base covering the same, a weight cover, a vibration deadening damper, a rod provided to the central part of the base and extending vertically, and an ear piece provided at the chip of the same. The center of the piezoelectric vibrator is made to abut with the base. The periphery of the base is made thin to provide an edge. The rod is provided with a sound wave guiding hole. The sound wave guiding hole is provided with an opening and closing tube. The weight cover has a predetermined weight. The center of the piezoelectric vibrator is made to abut with the base by bonding or pressure welding. The piezoelectric vibrator is provided by forming a thin film of PZT (lead zirconate titanate polymer) on the surface of a disc-like or rectangular electrode plate. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an ear hole type bone conduction receiver, that is, a bone conduction receiver used by being inserted into an ear hole of a human body.

  Patent Document 1 discloses a piezoelectric bone conduction receiver. A piezoelectric bone conduction receiver that directly transmits sound or the like as vibration to a bone of a wearer's head by a piezoelectric vibrator disposed in a hermetically sealed case, and the contact surface of the sealed case has a thin wall along a circumferential direction. And an inner peripheral portion of the contact surface surrounded by the thin edge portion is disposed in a state where the center of the piezoelectric vibrator is supported. Is characterized in that a deformed weight is mounted.

  Patent Document 2 discloses a cartilage conduction speaker. Two piezoelectric vibrators formed by forming a thin film of PZT (lead zirconate titanate polymer) on both the front and back sides of the electrode plate, and the two piezoelectric vibrators while maintaining a predetermined interval in parallel with each other In order to cause the two piezoelectric vibrators to operate in reverse to each other, one of the two polar electrical signals is applied to the electrode plate of the piezoelectric vibrator and the other is applied to the PZT of the piezoelectric vibrator. It consists of a conductive wire for transmitting to the thin film portion and a contact pad for contacting one of the two piezoelectric vibrators with the cartilage near the user's ear via an elastic member.

  Patent Document 3 discloses a piezoelectric speaker in which a rear piezoelectric vibrator and an air damper are added to a front piezoelectric diaphragm. A unimorph or bimorph type rear piezoelectric vibrator (piezoelectric diaphragm) is connected to the front piezoelectric diaphragm (piezoelectric vibrator) via a connecting rod, and an air damper chamber is provided to provide not only a low frequency range but also a wide band. Improve and flatten the sound pressure level and improve sound quality.

Patent Document 4 discloses a small bone conduction speaker. A cylindrical case having an opening at one end and a bottom body at the other end opposite to the one end, and a second case having a first end fixed to the bottom body and opposite to the first end A thin plate-shaped vibrating body whose end protrudes from the opening, a piezoelectric element having electrodes on both surfaces attached to be overlapped with at least one surface of the vibrating body, and extending inside and outside the case, And the second end of the vibrating body is a speaker configured to vibrate with a predetermined amplitude by the operation of the piezoelectric element.
JP 2008-178051 A JP 2008-148086 A JP 2008-062110 A JP 2007-096386 A

  Conventional bone conduction speakers transmit vibrations to cartilage and mastoid processes. For this purpose, it is fixed to the user's skin with an adhesive pad or by hooking it on the auricle.

  An object of the present invention is to provide an ear canal type bone conduction receiver suitable for being mounted and used in an ear hole (around the pinna in the external auditory canal).

  The ear hole type bone conduction receiver according to the present invention is a plate-like piezoelectric vibrator, a signal line for transmitting an electrical signal to the piezoelectric vibrator, and a casing on a side for transmitting the vibration of the piezoelectric vibrator. A base configured to cover the child, a damping damper that is interposed between the base and the piezoelectric vibrator and fixes the piezoelectric vibrator to the inside of the base, and a side that transmits vibration of the piezoelectric vibrator A weight cover that is shaped to cover the piezoelectric vibrator, a cylindrical rod that is provided at the center of the base and extends perpendicular to the surface of the piezoelectric vibrator, It consists of an ear piece provided at the tip of the rod so as to function as a cushion so as to fit stably when inserted into the ear hole.

  The invention described in claim 2 is the ear hole type bone conduction receiver according to claim 1, wherein the center of the piezoelectric vibrator is brought into contact with the base.

  The invention described in claim 3 is the ear hole type bone conduction receiver according to any one of claims 1 and 2, wherein the edge portion is formed by reducing the thickness of the peripheral portion of the portion where the rod of the base is provided. Is provided.

  The invention described in claim 4 is the ear hole type bone conduction receiver according to any one of claims 1, 2, or 3, wherein a lateral hole is opened at a location near the base of the rod, and air vibration of the outside air is generated. A sound wave guide hole is provided to guide the inside of the rod.

  A fifth aspect of the present invention is the ear hole type bone conduction receiver according to the fourth aspect, wherein a cylindrical open / close tube is provided to cover the rod so as to cover or open the sound wave guide hole. It is.

The invention described in claim 6 is the ear hole type bone conduction receiver according to any one of claims 1, 2, 3, 4 or 5,
The weight cover has a predetermined weight so that internal air vibrations do not leak outside through the weight cover.

  The invention described in claim 7 is the ear hole type bone conduction receiver according to claim 2, wherein the center of the piezoelectric vibrator is brought into contact with the base by adhesion with an adhesive.

  The invention described in claim 8 is the ear hole type bone conduction receiver according to claim 2, wherein a projection is provided at an inner central portion of the weight cover, and the center of the piezoelectric vibrator is formed on the base by the projection. It is brought into contact by pressing and pressing.

  The invention described in claim 9 is the ear hole type bone conduction receiver according to any one of claims 1, 2, 3, 4, 5, 6, 7 or 8, wherein the piezoelectric vibrator has a disk shape. It is what is.

  The invention described in claim 10 is the ear hole type bone conduction receiver according to any one of claims 1, 2, 3, 4, 5, 6, 7 or 8, wherein the piezoelectric vibrator has a rectangular shape. It is what has.

  An invention described in claim 11 is the ear hole type bone conduction receiver according to any one of claims 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10, wherein the piezoelectric vibrator Is formed by forming a thin film of PZT (lead zirconate titanate polymer) on the surface of the electrode plate.

  Since the present invention is configured as described above, it has the following advantages.

  Since the vibration of the piezoelectric vibrator is transmitted to the vicinity of the entrance of the ear canal via the rod and the earpiece, it can be transmitted to the cartilage or bone in the vicinity thereof.

  Since the center of the piezoelectric vibrator is brought into contact with the base, the vibration is efficiently transmitted to the rod.

  Since the edge of the base is reduced and the edge is provided, vibration due to the reverse phase of the periphery of the piezoelectric vibrator can also be transmitted to the rod, minimizing the loss of vibration energy be able to.

  Since the sound wave guide hole for guiding the air vibration of the outside air to the inside of the rod is provided, the environmental sound transmitted from the outside air can be guided to the ear canal and eventually to the eardrum.

  Since the sound wave guide hole is provided, discomfort caused by blocking the airway (the ear canal) can be removed.

  Since the open / close tube for opening and closing the sound wave guide hole is provided, it is possible to adjust the opening and closing of the sound wave guide hole according to the surrounding environment or according to the intended use.

  Since the weight cover has a certain weight, it is possible to prevent the air vibration generated inside by the piezoelectric vibrator from leaking in a direction other than the rod direction.

  By bringing the center of the piezoelectric vibrator into contact with the base by bonding with an adhesive, vibration energy can be reliably transmitted to the rod.

  The assembly process can be simplified by pressing and pressing the center of the piezoelectric vibrator against the base with a protrusion provided at the inner central portion of the weight cover.

  By making the shape of the piezoelectric vibrator into a disc shape, it is possible to make the shape similar to a general earphone that has been widely used.

  By making the piezoelectric vibrator into a rectangular shape, it is possible to provide a receiver with a slimmer and novel design.

  By using a piezoelectric vibrator having a thin film of PZT (lead zirconate titanate polymer) formed on the surface of the electrode plate, a receiver having a simple configuration can be provided.

  The present invention relates to the shape and structure of an ear canal bone conduction receiver. As described in the background section, a bone conduction speaker and a bone conduction receiver can be realized using a plate-like piezoelectric vibrator (a piezoelectric ceramic vibrator that converts an electrical signal into an audio signal).

  In the present invention, the plate-like piezoelectric vibrator is sandwiched between the base and the weight cover. A rod is set up vertically in the center of the base, and vibration is transmitted to the ear canal through the rod. The base and the rod can be molded integrally. A thin portion (edge portion) is provided in the peripheral portion of the base. The edge portion extends concentrically around the rod.

  An earpiece is provided at the tip of the rod, making it easy to fit into the ear hole. The rod is further provided with a lateral hole (sonic wave induction hole). And the cylindrical opening-and-closing tube is provided in the part so that it may slide to the circumferential direction, and a sound wave guide hole is opened and closed.

  To assemble this piezoelectric bone conduction receiver, first attach a signal line (conducting wire) to the piezoelectric vibrator, attach an annular damping damper to the periphery, and form a base with a rod (the rod and base are integrally molded) Adhere to the center of the object with an adhesive. Then, a weight cover is attached. Then, insert the open / close tube and the earpiece.

  Hereinafter, Example 1 will be described with reference to FIGS.

  FIG. 1 is a cross-sectional view of the ear hole type bone conduction receiver according to the present invention in the vibration transmission direction. In this figure, the open / close tube is in a closed state. The piezoelectric vibrator 10 is formed by forming a thin film of PZT (lead zirconate titanate polymer) on the surface of a disk-shaped metal plate. Although not shown in FIG. Is connected to the signal line 12.

  A housing enclosing the piezoelectric vibrator 10 is formed by the base 20 and the weight cover 30. Both the base 20 and the weight cover 30 have a shape similar to a dish and can be fitted together. The piezoelectric vibrator 10 is housed in a space formed by fitting them, and is protected from external impacts.

  An annular damping damper 15 is interposed between the piezoelectric vibrator 10 and the base 20 to contribute to control of parasitic vibration of the piezoelectric vibrator, improvement of frequency characteristics, and stabilization of the manufacturing posture. .

  The central portion of the piezoelectric vibrator 10 is brought into contact with the central portion of the base 20. This is because the vibration of the piezoelectric vibrator 10 is efficiently transmitted to the rod 25. Here, “contact” includes adhesion by an adhesive, pressure contact by which a protrusion is provided on the inner center portion of the weight cover 30 and pressed. In order to achieve the pressure contact, the protrusion is also integrally formed when the weight cover 20 is molded, or a screw hole is provided in the center of the weight cover and the receiver is assembled and pressed with a screw. To do. In the case of using screws, ex-post adjustment is possible.

  It is desirable that the base 20 and the rod 25 are integrally molded from the viewpoint of strength and vibration transmission. The rod 25 is an important member having a role of transmitting the vibration of the piezoelectric vibrator 10 to the user's ear hole, has a cylindrical shape, and stands perpendicularly to the central portion outside the base 20.

  An annular peripheral portion surrounding the rod 25 of the base 20 is formed as a thin portion (edge portion 26). This is because, in order to minimize the loss of vibration energy of the piezoelectric vibrator 10, the vibration due to the reverse phase of the peripheral portion of the piezoelectric vibrator 10 is transmitted to the base 20 and the rod 25.

  The weight cover 30 is a casing opposite to the side on which vibration is desired to be transmitted, and has a weight to prevent internal air vibration from leaking to the outside.

  A sound hole 27 is formed by providing a horizontal hole in a portion of the rod 25 close to the base 20. This is because the air vibration of the outside air is guided to the inside of the rod and the user's discomfort due to the airway being blocked is removed.

  Further, a cylindrical open / close tube 28 is provided so as to be slidable in the circumferential direction so as to cover the sound wave guide hole 27. The open / close tube 28 has holes similar to those of the sound wave guide hole 27. When the open / close tube 28 is moved so that the two holes overlap, the sound wave guide hole 27 is fully opened.

  When the open / close tube 28 is moved to the opposite side, that is, a position rotated by 180 degrees, the open / close tube 28 is completely closed. FIG. 1 shows a state in which the sound wave guide hole is completely closed by rotating the open / close tube 28 by 180 degrees. By adjusting the degree of rotation of the open / close tube 28, it is possible to adjust between opening the sound wave guide hole 27 completely and closing it completely.

  The earpiece 29 is a cushion for obtaining stability when the receiver is attached to the ear hole.

  FIG. 2 is a diagram illustrating the signal line extraction port 32. A signal line extraction port 32 is provided at an appropriate location near the boundary between the weight cover 30 and the base 20. The signal line extraction port 32 holds the signal line 12 with a necessary strength so that the electrical connection between the signal line 12 and the piezoelectric vibrator 10 is not hindered even when the signal line 12 is pulled by some force. .

  FIG. 3 is a diagram illustrating a state in which the open / close tube is open. At this time, the hole formed in the open / close tube 28 completely overlaps the sound wave guide hole 27 formed in the rod 25. The air vibration of the outside air enters the sound wave guide hole 27, proceeds in the direction of the thick two-dot chain line arrow in FIG. 3, and enters the user's ear canal. When the user of this receiver is a healthy person who does not have hearing impairment, it is possible to listen to surrounding sounds. Moreover, even in the case of a hearing impaired person, discomfort caused by blocking the ear canal (airway) can be removed.

  FIG. 4 is a view of the overall appearance of the piezoelectric vibrator having a disk shape when viewed from the weight cover side. Several concentric circles are drawn at the center of the weight cover 30 with broken lines. The contact portion of the base 20 with the piezoelectric vibrator 10, the rod 25, the open / close tube 28, the earpiece 29, and the like are drawn.

  As can be seen from FIG. 4, this receiver is similar to the shape of an earphone that has been widely used.

  FIG. 5 is a view of the overall appearance of the case where the piezoelectric vibrator has a rectangular shape, as viewed from the weight cover side. In the first embodiment, the piezoelectric vibrator 10 has a disk shape, but in the second embodiment, the piezoelectric vibrator 10 has a rectangular shape. The piezoelectric vibrator can also make a rectangular receiver by making changes to the first embodiment such as providing a damping damper on the short side of the rectangle, limiting to the edge part, and the side close to the short side of the rectangle. Can do. As a result, the degree of freedom of design is widened, and a slimmer and higher design receiver can be provided.

  This ear hole type bone conduction receiver can be used as an output device of various acoustic devices via a dedicated amplifier circuit that converts and amplifies an electrical signal for a piezoelectric vibrator. For example, it can be used for an MP3 player, a CD player, a radio, a television, a mobile phone, and the like.

It is sectional drawing of the vibration transmission direction of the ear hole type | mold bone conduction receiver which concerns on this invention. In this figure, the open / close tube is in a closed state. It is a figure which shows a signal wire extraction port. It is a figure which shows the state which the opening-and-closing tube is open. It is the figure which looked at the whole appearance from the weight cover side about the case where a piezoelectric vibrator is disk shape. It is the figure which looked at the whole external appearance from the weight cover side about the case where a piezoelectric vibrator is rectangular shape.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Piezoelectric vibrator 12 Signal line 15 Damping damper 20 Base 25 Rod 26 Edge part 27 Sound wave guide hole 28 Opening and closing tube 29 Earpiece 30 Weight cover 32 Signal line extraction port

Claims (11)

A plate-like piezoelectric vibrator;
A signal line for transmitting an electrical signal to the piezoelectric vibrator;
A housing that transmits vibrations of the piezoelectric vibrator, and a base that covers the piezoelectric vibrator; and
A damping damper that is interposed between the base and the piezoelectric vibrator and fixes the piezoelectric vibrator to the inside of the base;
A weight cover having a shape covering the piezoelectric vibrator, which is a casing opposite to a side that transmits vibration of the piezoelectric vibrator;
A cylindrical rod provided at the center of the base and extending perpendicular to the surface of the piezoelectric vibrator;
An ear hole type bone conduction receiver comprising: an ear piece provided at the tip of the rod so as to function as a cushion so as to stably fit when inserted into the ear hole. The ear hole type bone conduction receiver according to claim 1,
. An ear hole type bone conduction receiver, wherein the center of the piezoelectric vibrator is brought into contact with the base. The ear hole type bone conduction receiver according to any one of claims 1 and 2,
An ear hole type bone conduction receiver characterized in that an edge portion is provided by reducing the thickness of the peripheral portion of the portion where the rod of the base is provided. The ear hole type bone conduction receiver according to any one of claims 1, 2, or 3,
An ear hole type bone conduction receiver characterized in that a lateral hole is opened at a location close to the base of the rod, and a sound wave guide hole is provided to guide air vibrations of outside air into the rod. The ear hole type bone conduction receiver according to claim 4,
An ear hole type bone conduction receiver provided with a cylindrical open / close tube covering the rod so as to cover or open the sound wave guide hole. The ear hole type bone conduction receiver according to any one of claims 1, 2, 3, 4 or 5,
The ear hole-type bone conduction receiver, wherein the weight cover has a predetermined weight so that internal air vibrations do not leak outside through the weight cover. The ear hole type bone conduction receiver according to claim 2,
An ear hole type bone conduction receiver, wherein the center of the piezoelectric vibrator is brought into contact with the base by bonding with an adhesive. The ear hole type bone conduction receiver according to claim 2,
An ear hole type bone conduction receiver, wherein a protrusion is provided at an inner central portion of the weight cover, and the protrusion is pressed against the base by pressing the center of the piezoelectric vibrator against the base. The ear hole type bone conduction receiver according to any one of claims 1, 2, 3, 4, 5, 6, 7 or 8,
An ear hole type bone conduction receiver, wherein the piezoelectric vibrator has a disk shape. The ear hole type bone conduction receiver according to any one of claims 1, 2, 3, 4, 5, 6, 7 or 8,
An ear hole type bone conduction receiver, wherein the piezoelectric vibrator has a rectangular shape. The ear hole type bone conduction receiver according to any one of claims 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10,
An ear hole type bone conduction receiver, wherein the piezoelectric vibrator is formed by forming a thin film of PZT (lead zirconate titanate polymer) on the surface of an electrode plate.

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