JP4952211B2 - Bone conduction earphone - Google Patents

Description

  The present invention relates to a bone conduction earphone, and more particularly to a bone conduction earphone that can quickly and accurately reflect a weak current change as bone conduction vibration.

  Usually, the vibration of sound transmitted by air is transmitted to the eardrum in the ear. There are three bones (ear ossicles) in the eardrum, and the vibration of the eardrum is transmitted to the cochlea like a screw through this bone. The cochlea has limba fluid, and the vibration of this lymph fluid is transmitted to the auditory nerve while turning into an electrical signal, and the brain recognizes the sound. On the other hand, bone conduction omits the process in which the vibration in the above mechanism passes through the eardrum and the ossicle. That is, sound vibrations are sent directly to the cochlea through the skull, and even hearing-impaired people with abnormalities in the eardrum or ear ossicles can hear sound reliably through this bone conduction if the cochlea and auditory nerve are normal. it can. An earphone applying this principle is a bone conduction earphone.

  Various types and forms of conventional bone conduction earphones have been developed, but most of them are composed of a frame, a voice coil, a magnet, a diaphragm, etc., and a magnet is arranged in either the inner region or the outer region of the voice coil. (For example, refer to Patent Document 1). However, these conventional bone conduction earphones have a limit in the magnetic force generated, and unless a large amount of current is supplied to the voice coil, a quick and accurate reaction cannot be expected, resulting in higher sound quality and consumption of the audio device. There was a limit to reducing power consumption.

JP 2006-174432 A JP 2006-33787 A

  Therefore, in view of the above-mentioned situation, the present invention intends to provide a bone conduction earphone that can increase the generated magnetic force and can realize high sound quality and low power consumption. is there.

  In order to solve the above-mentioned problem, the present invention fixes a voice coil coaxially to the inner surface of an upper wall of a cylindrical frame whose lower part is open, and is positioned in an inner area and an outer area of the voice coil. And a second magnet, and a vibration part having a diaphragm connecting the first magnet and the second magnet to the frame, and vibrations of the voice coil and the vibration part are provided below the frame. A bone conduction earphone is provided, which is provided with a vibration transmission cushion for transmission to the human body.

  Here, the vibrating portion has the first magnet and the second magnet disposed on a substrate upper surface as a yoke attached to the center side of the diaphragm, and the first magnet is disposed on the upper surface of the first magnet. It is preferable that a plate is provided, a second plate is provided on the upper surface of the second magnet, and the voice coil is positioned in a gap between the first and second plates.

  In particular, there is provided a through-hole communicating with each other at each central position of the diaphragm, the substrate, the first magnet, and the first plate, and the members are integrally connected by a fixing pin that penetrates the through-hole. preferable.

  The diaphragm includes a central part attached to the substrate, a peripheral part attached to the frame, and a plurality of connecting parts provided radially from the central part to the peripheral part. Or what formed the bending part bent in hook shape is preferable.

  Furthermore, it is preferable that a cap for closing the lower portion of the frame is provided in contact with the diaphragm connected to the frame, and the vibration transmission cushion is provided on the lower surface of the cap.

  According to the bone conduction earphone of the present invention as described above, since the magnets are arranged in both the inner and outer regions of the voice coil, the magnetic force can be remarkably strengthened, and the weak current change supplied to the voice coil can be reduced. Reacts instantaneously, which makes it possible to improve the sound quality and reduce the current consumption rate.

  Further, specifically, the vibration part is provided with the first magnet and the second magnet on the upper surface of the substrate as a yoke attached to the center side of the diaphragm, and on the upper surface of the first magnet. Since the first plate is provided, the second plate is provided on the upper surface of the second magnet, and the voice coil is positioned in the gap between the first and second plates. An efficient magnetic circuit can be formed.

  In addition, since a through hole communicating with each other is provided at each central position of the vibration plate, the substrate, the first magnet, and the first plate, and the respective members are integrally connected by a fixing pin penetrating the through hole. The structure becomes simple and the manufacturing cost can be reduced.

  The diaphragm includes a central part attached to the substrate, a peripheral part attached to the frame, and a plurality of connecting parts provided radially from the central part to the peripheral part. Alternatively, since the bent portion bent in a bowl shape is formed, the relative vibration generated in the magnet is smoothly transmitted to the frame, and the surface area contributing to the vibration is increased by the presence of the bent portion, so that the vibration is transmitted smoothly. Vibration efficiency is improved.

  In addition, a cap for closing the lower portion of the frame is provided in contact with the diaphragm connected to the frame, and the vibration transmission cushion is provided on the lower surface of the cap. It can transmit vibration directly and increase bone conduction efficiency.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  1 to 5 show bone conduction earphones according to representative embodiments of the present invention, in which 1 is a bone conduction earphone, 2 is a voice coil, 3 is a vibrating part, 4 is a cap, and 5 is a vibration transmission cushion. Each is shown. A bone conduction earphone 1 according to the present invention includes a frame 10, a voice coil 2, a vibration unit 3, a cap 4, and a vibration transmission cushion 5.

  As shown in FIGS. 3 to 5, the bone conduction earphone 1 according to the present invention has a voice coil 2 fixed coaxially to an inner surface 12 a of an upper wall 12 of a cylindrical frame 10 having an open lower portion. A vibrating part having a first magnet 32 and a second magnet 34 located in the inner region and the outer region, and a diaphragm 36 for connecting the first magnet 32 and the second magnet 34 to the frame 10. 3, and a vibration transmission cushion 5 for transmitting vibrations of the voice coil 2 and the vibration part 3 to the human body is provided below the frame 10.

  The frame 10 has a space for accommodating the voice coil 2 and the vibration part 3 therein, and is configured by a substantially cylindrical member that is open at the bottom. The frame 10 has a lower end in a state where the voice coil 2 and the vibration part 3 are accommodated. The opening is closed with the cap 4. On the inner surface 12a of the frame upper wall 12, a ring-shaped projection 11 that fits inside the voice coil 2 is provided so as to be attached to the voice coil 2, and the voice coil 2 is securely coupled to the inner surface, It plays the role of converting the signal into an acoustic signal. In this example, it is made of a synthetic resin material, but is not limited to this. For example, it may be made of a nonmagnetic metal material.

  In the vibrating section 3, the first magnet 32 and the second magnet 34 are arranged on the upper surface of the substrate 35 as a yoke attached to the center side of the diaphragm 36, and the first magnet 32 is placed on the upper surface of the first magnet 32. The second coil 33 is provided on the upper surface of the second magnet 34, and the voice coil 2 is positioned in the gap between the first and second plates 31 and 33. Yes.

  The substrate 35 functioning as a yoke is a disk-shaped member made of a magnetic metal material such as iron located below the voice coil 2, and a protrusion 35 a is ring-shaped at a position corresponding to the lower end of the voice coil 2 on the upper surface. The first coil is bonded to the upper surface inside the protrusion 35a, and the second magnet is bonded to the upper surface outside the protrusion 35a. Positioned so as to be sandwiched. The height of the protrusion 35a, particularly the gap with the tip of the voice coil 2, affects the magnetic circuit, and is therefore set to a well-balanced height.

  The first magnet 32 is a permanent magnet configured in a flat columnar shape, and a first plate 31 having a lower surface of substantially the same shape is in close contact with the upper surface. The first plate 31 is made of a magnetic metal material such as iron, functions as a pole piece, and generates a strong magnetic field in a gap with the second plate 33 described later.

  The second magnet 34 is a permanent magnet having a flat cylindrical shape (ring shape) substantially the same height as the first magnet 32, and forms a magnetic circuit together with the first magnet 32. A second plate 33 having a lower surface of substantially the same shape is adhered to the upper surface in a close contact state. The second plate 33 is made of a magnetic metal material such as iron, functions as a top plate, and is a member that generates a strong magnetic field in the gap between the first plate 31 and the second plate 33.

  Through holes 36c, 35c, 32c, 31c communicating with each other are provided at the center positions of the vibration plate 36, the substrate 35, the first magnet 32, and the first plate 31, respectively. , 32c, 31c, the members 36, 35, 32, 31 are integrally connected in a coaxial manner. The fixing pin 37 uses a caulking pin that passes through the above member in the vertical direction and fastens it, but may use a bolt nut or other coupling tool.

  The diaphragm 36 is attached to the lower surface of the substrate 35, and is provided radially from the central part 60 provided with the through hole 36 c, the peripheral part 61 attached to the frame 10, and from the central part 60 to the peripheral part 61. A plurality of connecting portions 36a,... Are formed, and each connecting portion 36a is formed with a bent portion 36b bent in a wave shape or a hook shape. In this example, a total of four connecting portions 36a,... Are provided at intervals of 90 °, but the number and arrangement relationship are not particularly limited, and the width of each connecting portion is of course not limited. A large number of the wave-like and hook-like bent portions 36b are formed in each connecting portion 36a, so that the surface area involved in the vibration of the diaphragm 36 is maximized.

  A cap 4 that closes the lower part of the frame 10 is provided in contact with the diaphragm 36 connected to the frame 10, and the vibration transmission cushion 5 is provided on the lower surface 40 of the cap 4. More specifically, a notch groove 14 is provided on the inner surface side of the lower opening end portion 13 of the frame 10, and the peripheral edge 61 of the diaphragm 36 is fitted to the notch groove 14, and is formed on the lower surface side thereof. Further, when the protrusion 41 provided along the periphery of the cap 4 is fitted, the periphery 61 of the diaphragm 36 is pressed into the notch groove 14 of the frame 10 by the protrusion 41 of the cap 4. It is fixed in a fixed state.

  As shown in FIG. 5, the cap 4 is formed with a plurality of through holes 42 along the circumferential direction, and the air vibration generated in the space in the frame 10 through the through holes 42 is reduced to the bottom surface. It is devised so that it can be transmitted to the vibration transmission cushion 5 on the side. The vibration transmission cushion 5 is in close contact with the lower portion of the cap 4 so that the vibration generated from the voice coil 2 and the vibration unit 3 is efficiently transmitted to the human body.

  Hereinafter, the operation of the bone conduction earphone 1 of the present invention will be described.

  First, an electrical signal related to sound is supplied to the voice coil 2 through a lead wire (not shown), and a magnetic field proportional to the strength of the transmitted electrical signal is formed inside and outside the voice coil 2. The This magnetic field interacts with the first magnet 32 and the second magnet 34 in the vibrating portion 3, that is, with the magnetic field generated in the gap between the first plate 31 and the second plate 33. By acting, the voice coil 2 and the vibrating part 3 vibrate in a vertical direction at a predetermined frequency.

  When the vibration part 3 vibrates while having a predetermined frequency in the vertical direction with respect to the voice coil 2 as described above, this vibration is immediately transmitted to the diaphragm 36 having the connecting part 36a and the wavy and hook-like bent parts 36b. Is done. At this time, as described above, a large number of bent portions 36b that increase the vibration efficiency are formed in the vibration plate 36, so that the vibration of the vibration portion 3 by the magnets 32 and 34 is greatly amplified by the vibration plate 36 and output.

  The vibration output from the diaphragm 36 is transmitted to the human body through the cap 4 and the vibration transmission cushion 5 so that the human body can recognize a predetermined acoustic signal.

  Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can of course be implemented in various forms without departing from the gist of the present invention.

The upper perspective view which shows the bone conduction earphone which concerns on typical embodiment of this invention. Similarly a lower perspective view. Similarly longitudinal section. Similarly exploded longitudinal sectional view. Similarly disassembled perspective view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bone conduction earphone 2 Voice coil 3 Vibration part 4 Cap 5 Vibration transmission cushion 10 Frame 11 Protrusion part 12 Upper wall 12a Inner surface 13 Open end part 14 Notch groove 31 1st plate 32 1st magnet 33 2nd plate 34 2nd 2 Magnet 35 Substrate 35a Protrusion 36 Diaphragm 36a Connection part 36b Bending part 36c Through hole 37 Fixing pin 40 Lower surface 41 Projection part 42 Through hole 60 Center part 61 Peripheral part

Claims (3)

The voice coil is fixed coaxially to the inner surface of the upper wall of the cylindrical frame with the lower part open,
Providing a vibration part having a first magnet and a second magnet located in the inner region and the outer region of the voice coil, and a diaphragm connecting the first magnet and the second magnet to the frame;
In the lower part of the frame, a vibration transmission cushion for transmitting the vibration of the voice coil and the vibration part to the human body is provided,
The vibrating portion has the first magnet and the second magnet disposed on the upper surface of the substrate as a yoke attached to the center side of the diaphragm, and the first plate is disposed on the upper surface of the first magnet. A second plate is provided on the upper surface of the second magnet, and the voice coil is positioned in the gap between the first and second plates .
The diaphragm is composed of a central part attached to the substrate, a peripheral part attached to the frame, and a total of four connecting parts provided radially at intervals of 90 ° from the central part to the peripheral part. A bone conduction earphone comprising a plurality of bent portions bent in a wave shape or a hook shape in a connecting portion .   A through hole communicating with each other is provided at each central position of the vibration plate, the substrate, the first magnet, and the first plate, and the members are integrally connected by a fixing pin penetrating the through hole. The bone conduction earphone according to 1. The bone conduction earphone according to claim 1 or 2 , wherein a cap for closing a lower portion of the frame is provided in contact with the diaphragm connected to the frame, and the vibration transmission cushion is provided on a lower surface of the cap.

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