JP2015019342A - Speaker system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve higher quality in a speaker system.SOLUTION: A first speaker part A includes: a first yoke 31; a first vibration film 33 fixed to the yoke; and a first drive unit 35. A second speaker part B includes: a second yoke 49; a second vibration film 53 fixed to the second yoke; and a second drive unit 53. The first and second speaker parts A, B are integrally arranged by connection so as to allow the respective bottoms of the first and second yokes 31, 49 to adjacently face each other and to obtain an airtight state between the first and second vibration films 33, 51. The first and second vibration films 33, 51 are driven to perform a displacement vibration in the same direction by the first and second drive units 35, 53.

Description

  The present invention relates to a speaker device, and more particularly to improvement of an earphone or headphone worn on a user's ear or head, and a speaker device usable as a large speaker.

  Conventionally, as a speaker device to be worn on a user's ear, for example, as shown in FIG. 6, one end surface of a columnar magnet 5 is fixed in a cup-shaped yoke 3 disposed in a case body 1. A thin vibrating membrane 7 is fixed to the tip of the yoke 3 so as to face the other end surface with a gap therebetween, covering the opening of the yoke 3, and the cylindrical coil 9 fixed to the vibrating membrane 7 is attached to the magnet 5. A configuration in which the outer periphery is inserted and arranged at a slight interval is well known.

  The case body 1 includes a funnel-shaped base 1a and a front cover 1b covering the tip (right side in the figure), and the opening tip of the yoke 3 is fixed in the front cover 1b.

  Reference numeral 11 in FIG. 6 denotes a plurality of sound passage holes formed through the front cover 1b on the front surface of the diaphragm 7, and reference numeral 13 denotes a cable led out to the outside. A knot 13a is formed in the base 1a. ing.

  In this speaker device, the drive unit 15 that vibrates the vibration film 7 is formed by the magnet 5 and the coil 9, and the sound signal is generated by vibrating the vibration film 7 by applying an audio signal to the coil 9 by the cable 13 from the outside. The transmitted sound is propagated from the sound hole 11 on the front surface of the diaphragm 7 to the outside.

  This type of speaker device is actually commercialized as, for example, an ear canal insertion type earphone device.

  As the ear canal insertion type earphone device, for example, as shown in FIG. 7, the configuration shown in FIG. 6 is slightly changed, and the ear concha surrounded by the user's tragus 17, antipodes 19, and concha 21. The case body 1 is inserted into the intercavity 23 so that the vibrating membrane 7 is close to the concha 21, and the external ear canal 25 extends from the concha cavity 23 to the eardrum (not shown). It has the structure which inserts and uses the provided sound passing cylinder 27. FIG.

  Reference numeral 29 in FIG. 7 denotes a flexible ear tip (ear pad, ear piece) fitted on the outer periphery of the sound passage cylinder 27 and is elastically brought into contact with the inner wall of the ear canal 25.

  As an actual product, a coaxial type (see FIG. 7) in which the central axis of the sound passage cylinder 27 is aligned with the central axis of the diaphragm 7 (see FIG. 7), and although not shown, the sound passage cylinder 27 is disposed on the center axis of the diaphragm 7. There is a non-coaxial type in which the central axis is set obliquely. FIG. 7 shows a state where the earphone device is attached to the left ear.

  By the way, as a known example of the earphone, there is JP 2010-283634 A (Patent Document 1).

JP 2010-283634 A

  However, any of the speaker devices described above has a configuration in which the yoke 3, the magnet 5, the vibration film 7 and the coil 9 arranged in the case main body 1 are set as one set. In this configuration, the driving sound is further improved in quality. It is considered that there is a limit to the configuration in order to respond to the user request for the realization.

  Therefore, as a result of diligently examining various configurations in pursuit of further higher quality, the present inventor has found that the drive sound can be improved in quality by combining a plurality of speakers. Completed.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a speaker device capable of improving the quality of driving sound.

  In order to solve such a problem, the speaker device of the present invention includes a first yoke having a magnetic material formed in a cup shape and the first yoke so as to cover the open end surface side of the first yoke. A first speaker unit comprising: a supported first vibrating membrane; and a first drive unit that vibrates the first vibrating membrane by an audio signal that is supported and applied in the first yoke; A magnetic second yoke formed in a cup shape, a second vibration film supported by the second yoke so as to cover the open end surface side of the second yoke, and the second yoke And a second speaker unit having a second driving unit that vibrates the second diaphragm by an audio signal applied thereto.

  In addition, the first and second loudspeakers face each other so that the bottom portions of the first and second yokes come close to each other and are acoustically airtight between the first and second vibrating membranes. The first and second yokes have sound passage holes through which the sound is transmitted toward the second and first diaphragms when the sound is generated by the vibrations of the first and second diaphragms. The sound produced by driving the first and second vibrating membranes to be displaced and oscillating in the same direction is propagated from the first or second speaker unit to the outside.

  The speaker device of the present invention may have a configuration in which the first and second speaker portions are formed in the same shape.

  The speaker device of the present invention may have a configuration in which the first and second speaker units are coaxially arranged.

  The speaker device of the present invention may have a configuration in which the outer circumferences of the first and second yokes are coupled by an annular coupling member, and the first and second vibrating membranes are acoustically airtight. .

  The speaker device according to the present invention may be configured such that the first and second driving units drive the first and second vibrating membranes with the audio signals having the opposite phases.

  In the speaker device according to the present invention, the first speaker unit has a first magnet fixed in the first yoke, and an open end surface side of the first yoke spaced from the end surface of the first magnet. A first vibration film supported by the first yoke so as to cover, and inserted into the outer periphery of the first magnet supported by the first vibration film with a slight gap therebetween. A second coil portion fixed to the second yoke, and an end surface of the second magnet. A second vibration film supported by the second yoke so as to cover the open end face side of the second yoke with a space therebetween, and a slight distance between the outer periphery of the second magnet supported by the second vibration film. Inserted and forms a second drive with its second magnet Arrangement of and a cylindrical second coil is also possible.

  The speaker device according to the present invention has a third magnet that is close to and faces the first magnet of the first speaker unit with the same polarity, and a second magnet of the second speaker unit that is adjacent to the first magnet with the same polarity. A configuration having a fourth magnet facing each other is also possible.

  The speaker device of the present invention may have a configuration in which the connecting member is formed with a small ventilation hole that ventilates inside and outside.

  The speaker device according to the present invention may have a configuration in which a plurality of small holes are formed in the first or second vibrating membrane disposed on the side that propagates the generated sound to the outside.

  In such a speaker device according to the present invention, the first and second vibrating membranes are arranged in an acoustically airtight state so that the bottom portions of the first and second speaker portions face each other, and the first and second vibrating membranes are faced to each other. Since the first and second diaphragms are configured to be driven to displace and vibrate in the same direction, it is possible to obtain high-quality driving sound with little distortion.

  In the speaker device of the present invention, if the first and second speaker units are formed in the same shape, the common speaker unit can be used for the first and second speaker units, and the cost is likely to be low. .

  In the speaker device of the present invention, the first and second speaker portions are arranged coaxially with each other, so that the size can be easily reduced and desired characteristics can be easily obtained.

  Furthermore, in the speaker device of the present invention, the outer periphery of the first and second yokes is connected by an annular connecting member, so that the first and second vibrating membranes are easily acoustically confidential, Assembly is also simplified.

  Furthermore, in the speaker device according to the present invention, the first and second diaphragms are driven by the same audio signal having the opposite phase to each other. Since the first diaphragm and the second diaphragm can be displaced and vibrated in the same direction only by connecting the audio signal to the second drive unit, the configuration is simplified.

  In the speaker device according to the present invention, the first and second speaker portions include first and second magnets fixed in the first and second yokes, and end surfaces of the first and second magnets. The first and second vibrating membranes supported by the first and second yokes so as to cover the open end face sides of the first and second yokes with a space therebetween, and supported by these first and second vibrating membranes Even in the configuration having the first and second coils inserted into the outer circumferences of the first and second magnets at a slight interval to form the first and second drive units, the above-described effects can be easily obtained. is there.

  In the speaker device according to the present invention, the third magnet that is close to and faces the first magnet of the first speaker unit with the same polarity, and the second magnet of the second speaker unit that is adjacent to the first magnet with the same polarity. By having a configuration having the fourth magnet facing each other, the leakage magnetic flux that is likely to occur in the magnetic space between the first and second magnets and the first and second yokes is effectively reduced and compressed, It is easy to improve the sound generation level and the speaker characteristics without changing the conventional speaker configuration.

  In the speaker device of the present invention, a small air hole that vents the inside and outside of the connecting member is formed, or a minute hole is formed in the first or second vibrating membrane on the side that propagates the generated sound to the outside. If a plurality of such speakers are formed, the frequency characteristics of the first and second speaker units can be finely adjusted within a range that does not significantly affect the frequency characteristics.

It is a longitudinal cross-sectional view (cross section between BB in FIG. 3) which shows embodiment of the speaker apparatus based on this invention. It is a cross-sectional view (cross section between AA in FIG. 3) which concerns on the speaker apparatus of FIG. It is the side view (A), front view (B), and bottom view (C) which concern on the speaker apparatus of FIG. It is a wave form diagram explaining operation | movement of the speaker apparatus of FIG. It is the schematic explaining the operation | movement of the speaker apparatus of FIG. It is sectional drawing which shows the conventional speaker apparatus. It is sectional drawing which shows the conventional speaker apparatus with the usage example.

  Hereinafter, an embodiment of a speaker device according to the present invention will be described with an earphone device as an example with reference to the drawings.

  1 and 2 are a longitudinal sectional view and a transverse sectional view showing an embodiment of a speaker device according to the present invention, and FIG. 3 is a side view (A), a front view (B) and a bottom view of the speaker device. (C).

  1 and 2, the speaker device according to the present invention is arranged coaxially so that the first speaker portion A and the second speaker portion B having substantially the same shape as the first speaker portion A face each other close to each other. However, they are integrated.

  The first speaker unit A includes a first yoke 31, a first vibration film 33 supported by the first yoke 31, and an audio signal supported and applied in the first yoke 31. A first drive unit 35 for driving the first vibration film 33.

  The first yoke 31 is formed in a cup shape from a magnetic material, and one end surface of a cylindrical first magnet 37 is overlaid on the inner bottom portion of the first yoke 31, and the other end surface is overlaid on the other end surface. A first holding plate 39 formed in a ring shape from a magnetic material is stacked, and a ring-shaped first circuit board 41 having a smaller diameter is stacked on the outer bottom portion of the first yoke 31. .

  The bottom portion of the first yoke 31, the first magnet 37, the first holding plate 39, and the first circuit board 41 are integrally formed with, for example, an adhesive so as to penetrate through the central spaces thereof. The first magnet 37 and the first holding plate 39 are positioned in the first yoke 31, and the first circuit board 41 is positioned on the outer bottom of the first yoke 31.

  A plurality of sound passage holes 43 penetrating the first yoke 31 are formed in an annular shape at equal intervals so that the inside and the outside of the first yoke 31 can be vented at the bottom.

  In the first magnet 37, the open end side of the first yoke 31 is magnetized to, for example, an N pole, and the first holding plate 39 is also an N pole.

  On the other end surface side of the first magnet 37, that is, on the open end side of the first yoke 31, the thin first vibrating membrane 33 is arranged to face the first magnet 37 with a space therebetween. Thus, the open end surface side (opening) of the first yoke 31 is covered.

  One end face side of the cylindrical first coil 45 is fixed to the first vibration film 33, and the first coil 45 is inserted and arranged on the outer periphery of the first magnet 37 at a slight interval, The first drive unit 35 described above is formed.

  A cable 47 (not visible in FIG. 1) for supplying an audio signal from the outside is connected to the first circuit board 41, and lead wires (not shown) arranged on the first yoke 31 and the first vibration film 33. Thus, an audio signal is supplied to the first coil 45.

  The second speaker unit B includes a second yoke 49, a second diaphragm 51 supported by the second yoke 49, and an audio signal supported and applied in the second yoke 49. A second drive unit 53 for driving the second vibration film 51.

  The second yoke 49 is formed in a cup shape from a magnetic material, and one end surface of a cylindrical second magnet 55 is superimposed on the inner bottom portion of the second yoke 49, and the other end surface is overlaid on the other end surface. A second holding plate 57 formed in a ring shape from a magnetic material is stacked, and a second circuit board 59 is stacked on the outer bottom of the second yoke 49.

  The bottom portion of the second yoke 49, the second magnet 55, the second holding plate 57, and the second circuit board 59 are integrally formed by, for example, an adhesive so as to penetrate through the respective central spaces. The second magnet 55 and the second holding plate 57 are located in the second yoke 49, and the second circuit board 59 is located on the outer bottom portion of the second yoke 49.

  A plurality of sound passage holes 61 penetrating the second yoke 49 are formed in an annular shape at equal intervals, and the inside and outside of the second yoke 49 can be vented at the bottom.

  In the second magnet 55, the open end side of the second yoke 49 is magnetized to the same polarity as the tip end side of the first magnet 37, for example, N pole, and the second holding plate 57 is also N pole. ing.

  On the other end face side of the second magnet 55, that is, on the open end side of the second yoke 49, a thin second vibrating membrane 51 is fixed to the tip end of the second yoke 49 so as to face the second magnet 55 with a space therebetween. The open end surface side (opening) of the second yoke 49 is covered.

  One end face side of the cylindrical second coil 63 is fixed to the second vibration film 51, and the second coil 63 is inserted and arranged at a slight interval on the outer periphery of the second magnet 55, The second drive unit 53 described above is formed.

  The second circuit board 59 is connected to a cable 47 that supplies an audio signal from the first circuit board 41, and a lead wire (not shown) disposed on the second yoke 49 and the second vibration film 51. Thus, an audio signal is supplied to the second coil 63.

  The second coil 63 is connected to a cable 47 so that an audio signal having the same phase as that of the first coil 43 is applied.

  The first and second speaker portions A and B are flat and cylindrical in the outer periphery of the first and second yokes 31 and 49 with their bottoms facing each other with a slight gap therebetween. The first and second vibrating membranes 33, 51 are hermetically sealed (sealed), supported and fixed by the connecting member 65, and integrated in a coaxial state in which the center axes thereof coincide with each other.

  In the connecting member 65, an acoustic filter 67 made of a disc-like sponge or mesh cloth is supported by the connecting member 65 between the bottoms of the first and second yokes 31 and 49. Is divided in the axial direction.

  The first speaker portion A is covered with a first cover 69 formed from a synthetic resin and formed into a flat cup shape so as to cover the first yoke 31 and the first vibration film 33. The member 65 is fixed so as to fit on the outer periphery of one open end.

  The second speaker portion B is covered with a second cover 71 formed in a cup shape from synthetic resin so as to cover the second yoke 49 and the second vibration film 51, and this is connected to the second speaker portion B. It is being fixed so that the other open end outer periphery of 65 may be fitted.

  The first and second covers 69 and 71 are integrally fixed to the connecting member 65 with an adhesive (not shown) or the like so that the connecting member 65 is interposed therebetween. It is led out from the connecting member 65.

  The second cover 71 is integrally provided with a synthetic resin sound passage cylinder 73 protruding in an oblique direction with respect to the central axis of the second speaker part B (first speaker part A). The sound generated by the vibrations of the first and second vibrating membranes 33 and 51 is propagated from the sound passage 73 to the outside.

  An ear tip 75 made of a flexible synthetic resin is detachably fitted on the outer periphery on the front end side of the sound passage cylinder 73.

  Reference numeral 77 in FIG. 1 is a vent hole formed through the connecting member 65. By making the air pressure in the sealed space between the first and second vibrating membranes 33 and 51 the same as the external air pressure, This prevents deformation of the first and second vibrating membranes 33 and 51 due to the difference.

  On the inner wall of the first cover 69, a third magnet 79 having a ring plate shape having the same diameter and the same polarity as the first magnet 37, for example, an N pole, is provided in the first magnet of the first speaker unit A. The first vibration film 33 is placed between the first vibration film 33 and the first vibration film 33 so as to face each other at a slight interval.

  On the inner wall of the second cover 71, a fourth magnet 81 having a ring plate shape having the same diameter and the same polarity as the second magnet 55, for example, an N pole, is provided as the second magnet of the second speaker unit B. The second vibration film 51 is placed between the first vibration film 55 and the second vibration film 51.

  The adjustment hole 83 is formed through the first cover 69 with an inner diameter of about 1 mm so as to connect the sealed space between the first cover 69 and the first vibrating membrane 33 and the external free space, and is mainly used for bass adjustment. Used. When the inner diameter of the adjustment hole 83 is increased, the low frequency range is increased due to frequency characteristics, and when the adjustment hole 83 is decreased, the low frequency range is decreased.

  The adjustment hole 85 is formed so as to penetrate the second cover 71 with an inner diameter of about 1 mm. In actual use, the adjustment pressure 85 reduces the internal and external air pressure when the eartip 75 blocks the space inside the ear canal 25 and the earphone device from the outside. This is to keep it constant and to reduce discomfort to the ear, and may actually be closed.

  In such a speaker device, the first and second driving are performed by applying an audio signal to the first and second coils 45 and 63 of the first and second speaker portions A and B via the cable 47. The parts 35 and 53 vibrate the first and second vibrating membranes 33 and 51 to generate sound, and the sound is propagated to the outside from the sound passage 73 of the second cover 71.

  In the speaker device according to the present invention, the covers 69 and 71 are housed in the concha cavity 23 surrounded by the above-mentioned tragus 17, antipod 19, and concha 21, and the ear chip 75 at the tip is placed in the ear canal. 25 is used by being inserted (see FIG. 7).

  In addition, the first and second coils 45 and 63 of the first and second speaker portions A and B are connected so that the same audio signal is applied in opposite phases, and the first and second coils Since the vibration films 33 and 51 are disposed facing each other with the first and second yokes 31 and 49 interposed therebetween, the first and second vibration films 33 and 51 are in the same direction. Cause substantially the same vibration displacement to produce a loud vibration sound.

  In this regard, in the case of the first or second speaker unit A or B alone as in the conventional configuration, when the input signal is large due to the structure of the speaker and the shape of the diaphragm, the operation of the diaphragm is in the upward (convex) direction. As shown in FIG. 4A or B, generally, distortion is easily generated from one side of the vibration, and the first and second vibrating membranes 33 and 51 are not symmetric. Vibration is difficult to be symmetric.

  However, in the present invention, as described above, the first and second vibrating membranes 33 and 51 of the first and second speaker portions A and B opposed in the opposite directions are simultaneously and at the same vibration width in the same direction. By oscillating, the distortions are complemented each other, and as shown in the composite waveform of FIG. 4C, the vibrations of the first and second vibrating membranes 33 and 51 tend to be symmetric so that the distortion is small and the waveform is large.

  Further, in the speaker device according to the present invention, the first and second magnets 37 and 55 of the first and second speaker portions A and B have third and third magnets magnetized to the same polarity, for example, N pole. Since the fourth magnets 79 and 81 face each other, the first and third magnets 37 and 79 and the second and fourth magnets 39 and 81 tend to repel each other.

  Therefore, as shown in FIG. 5A, the magnetic flux generated between the tip side of the first or second magnet 37, 55 and the first or second yoke 31, 49 adjacent thereto faces the third surface. Or it does not spread under the influence of the N pole of the fourth magnets 79 and 81, and it is easy to suppress the generation of leakage magnetic flux between the first or second yokes 31 and 49, and the magnetic flux density increases. Therefore, the drive loss of the first and second vibrating membranes 33 and 51 can be reduced.

  In FIG. 4, the first and second coils 45 and 63 and the first and second vibrating membranes 33 and 51 are not shown.

  In this regard, as shown in FIG. 5B, the first or second speaker unit A or B alone as in the conventional configuration has a distal end side of the first or second magnet 37 or 55 and the first or second yoke. The magnetic flux is formed to spread to some extent between 31 and 49, leakage magnetic flux is generated, and it is difficult to ignore the loss.

  Thus, in the speaker device of the present invention, the magnetic first yoke 31 formed in a cup shape, the first magnet 37 fixed in the first yoke 31, and the first magnet. 37, a first vibration film 33 fixed to the first yoke 31 so as to cover the open end surface side of the first yoke 31 with a distance from the end face of the first yoke 31, and a first vibration film 33 supported by the first vibration film 33 A cylindrical first coil 45 that is inserted and arranged at a slight interval around the outer periphery of the magnet 37 and vibrates the first vibrating membrane 33 in cooperation with the first magnet 37 by an applied audio signal. A second yoke 49 made of a magnetic material having a first speaker portion A having a cup shape, a second magnet 55 fixed in the second yoke 49, and the second magnet 55. Leave a gap from the end face of the magnet 55 A second vibration film 53 fixed to the second yoke 49 so as to cover the open end face side of the second yoke 49, and a slight gap between the second vibration film 53 and the outer periphery of the second magnet 55. And a cylindrical second coil 63 that vibrates the second vibrating membrane 51 in cooperation with the second magnet 55 by an applied audio signal, and a first speaker unit A second speaker portion B having the same shape as A is provided.

  In addition, the bottoms of the first and second yokes 31 and 49 face each other so as to come close to each other, and the first and second vibrating membranes 33 and 51 are hermetically sealed to form the first and second The second speaker parts A and B are integrally arranged by the connecting member 65.

  Furthermore, the first and second sound passage holes 43 through which the sound generated by the vibrations of the first and second vibration films 33 and 51 is transmitted toward the second and first vibration films 33 and 51 side. 61 is formed on the first and second yokes 31 and 49, and the sound produced by driving the first and second vibrating membranes 33 and 51 to vibrate in the same direction is generated in the second speaker unit B. To the outside from the sound passage 73.

  Therefore, in the first and second vibrating membranes 33 and 51, it is easy to reduce odd-order distortion, which is considered to have an adverse effect on sound quality, and to obtain substantially symmetrical vibrations in the upward and downward directions, and the responsiveness. In addition, a crisp drive sound can be obtained, and the drive sound can be improved in quality while maintaining an increase in the drive sound.

  In general, the second speaker portion B on the sound passage 73 side for propagating sound to the outside is for high sounds, and the first speaker portion A on the opposite side far from the sound passage hole 73 is for low sounds. In addition, the sound from the second loudspeaker part B tends to be emphasized.

  In the speaker device according to the present invention, the sound generated by driving the first and second vibrating membranes 33 and 51 of the first and second speaker portions A and B to be displaced and vibrated in the same direction is generated by the second sound. Propagating from the speaker part B through the sound passing cylinder 73, the first speaker part A has a low-frequency speaker characteristic, the second speaker part B has a high-frequency speaker characteristic, and The overall speaker characteristics are exhibited by the combination of the speaker characteristics, and the high frequency characteristics are particularly advantageous, so that it is easy to obtain a good driving sound as a whole.

  Moreover, in the speaker device of the present invention, since the first and second speaker portions A and B are arranged in the back surface state, the wiring connection position between the cable 47 and the first and second circuit boards 41 and 53. And the wiring work of the cable 47 becomes easy.

  Further, with respect to the magnetic flux from the first and second magnets 37 and 55, the third and fourth magnets 79 and 81 can significantly reduce the leakage magnetic flux and increase the magnetic flux density. It is easy to double the driving force of the speaker portions A and B.

  However, in the speaker device of the present invention, the third and fourth magnets 79 and 81 are not essential.

  Further, in the configuration described above, the acoustic filter 67 is disposed in the middle of the connecting member 65 between the bottom portions of the first and second yokes 31 and 49. This is to reduce the area and prevent interference due to the phase difference with the second speaker B for high sounds, and is not essential as well.

  By the way, in the speaker device of the present invention, the first and second vibrating membranes 33 and 51 are hermetically sealed so that the first and second vibrating membranes 33 and 51 are deformed due to a change in the atmospheric pressure. There may be worries that will occur.

  In order to cope with this, the vent hole 79 is formed in the communication member 65. However, as an alternative configuration, the first and second vibrating membranes 33 and 51 have small holes that do not affect good vibration frequency characteristics. (Not shown) could be formed.

  For example, a small hole having an inner diameter of 500 microns or less, more preferably an inner diameter of 50 microns or less (50 to 500 microns), although there is a slight change in the high sound range, the frequency characteristics are hardly affected.

  As described above, the first and second vibrating membranes 33 and 51 are formed by penetrating a plurality of small holes that do not affect the vibration frequency characteristics, thereby causing a slight change in the high sound range.

  Therefore, when it is desired to control the deformation of the first and second vibrating membranes 33 and 51 due to a change in atmospheric pressure and to control the frequency characteristics of the high sound range, for example, the first speaker unit A is provided with low sound, For the two purposes of giving high sound to the speaker part B, a small hole having the same or different inner diameter of about 50 to 500 microns is provided in one or both of the first and second vibrating membranes 33 and 51. Is also possible.

  In short, if a minute small hole that hardly influences the frequency characteristics is formed in at least the second speaker portion B of the first and second vibrating membranes 33 and 51, the frequency characteristics are not greatly affected. Within the range, the frequency characteristics of the first and second speaker portions A and B can be finely adjusted.

  Thus, in the speaker device of the present invention, the airtight state between the first and second speaker portions A and B is not a complete or strict sealed state, but an acoustic airtight state that does not significantly affect the vibration frequency characteristics. As long as the first and second vibrating membranes 33 and 51 can vibrate integrally, for example, the above-described vent hole 77 and fine small holes can be formed.

  Moreover, since the speaker for headphones has a large diameter, the coil winding diameter is large, and the amplitude as the speaker is large, so that the impedance is inevitably large.

  However, if such a speaker is constituted by the speaker device of the present invention, the output with respect to the voltage is reduced by the speaker alone, but the output of the counter voltage is obtained by the combination of the two first and second speaker portions A and B. Becomes larger, which is advantageous not only in terms of sound quality but also in terms of hearing.

  In the speaker device of the present invention, the first and second speaker portions A and B do not have to have the same shape or are arranged coaxially with each other, but are formed in the same shape or arranged coaxially. By doing so, it is possible to use a common speaker unit for the first and second speaker units A and B, and it is inexpensive, easy to downsize, and easily obtain desired characteristics.

  In the speaker device of the present invention, the bottom portions of the first and second yokes 31 and 49 are connected to each other by an annular connecting member 65 with a slight space therebetween, and the first and second vibrating membranes 33 and 51 are connected. Between the first and second magnets 37 and 55 of the first and second speaker portions A and B facing each other with the same polarity, the first and second common parts having the same configuration 2 can be used for the speaker portions A and B, the assembly is simplified, and the cost is hardly increased.

  Furthermore, in the speaker device of the present invention, the first and second driving units 35 and 53 drive the first and second vibrating membranes 33 and 51 by the audio signals having the opposite phases, so The first diaphragm and the second diaphragm 33, 51 are displaced in the same direction only by the connection of the audio signal to the first and second drive sections 35, 53 of the second speaker section A, B. Since it vibrates, the configuration is simplified.

  In the speaker device of the present invention, the first and second speaker portions A and B include the first and second yokes 31 and 49, the first and second magnets 37 and 55, the first and second, respectively. The first and second yokes 31 and 49 and the first and second vibrating membranes supported by the first and second yokes 31 and 49 are not limited to the configuration formed by the first and second coils 45 and 63. 33, 51, and first and second drive portions 35, 53 for driving the first and second vibrating membranes 33, 51 by sound signals supported and applied in the first yokes 31, 49. If the configuration is such that the first and second vibration films 35 and 53 are driven by the first and second drive units 35 and 53, the object of the present invention can be achieved.

  Furthermore, in the speaker device of the present invention, the second speaker portion B has a configuration in which the sound passing cylinder 73 formed in the second cover 71 protrudes obliquely with respect to the central axis of the second speaker portion B. The structure which protrudes along the center axis | shaft of this is also possible (refer FIG. 7).

  By the way, in the speaker device of the present invention, when the characteristics of the two speakers are aligned under the influence of the phase difference due to the distance between the first and second vibrating membranes 33 and 51, the acoustic impedance around the speaker, and the like, In addition, since there is a concern that the sound quality may be adversely affected due to the fluctuation of the frequency characteristics, it may be preferable to slightly change the characteristics of the first and second speaker portions A and B.

  Therefore, as described above, the first speaker unit A is for bass, and a small hole is formed in the second vibration film 51 of the second speaker unit B on the side that propagates the sound generated to the outside, The frequency characteristics can be arbitrarily changed.

  Further, in order to increase the weight of the vibration system so that the first speaker unit A for low sounds is less likely to produce high sounds, the conductor of the first coil 45 is made of a material heavier than that of the second coil 63, or a filter 67. It is better to cut the treble range with

  Furthermore, the speaker device of the present invention can be configured by a combination of first and second speaker portions A and B having different sizes.

DESCRIPTION OF SYMBOLS 1 Case main body 1a Base 1b Front cover 3 Yoke 5 Magnet 7 Vibrating membrane 9 Coil 11 Sound passage hole 13, 47 Cable 13a Knot 15 Drive part 17 Tragus 19 Pair of beads 21 Ear concha 23 Ear concha cavity 25 External ear canal 27, 73 Sound passage cylinders 29, 75 Ear tips 31 First yoke 33 First vibration membrane 35 First drive portion 37 First magnet 39 First pressing plate 41 First circuit board 43 First sound passage hole 45 First coil 49 Second yoke 51 Second vibrating membrane 53 Second sound passage hole 55 Second magnet 57 Second pressing plate 59 Second circuit board 61 Second sound passage hole 63 Second Coil 65 Connecting member 67 Filter 69 First cover 71 Second cover 77 Vent hole 79 Third magnet 81 Fourth magnet 83, 85 Adjustment hole A First speaker part B Second speaker part

Claims (9)

A magnetic first yoke formed in a cup shape, a first vibration film supported by the first yoke so as to cover the open end surface side of the first yoke, and the first yoke A first speaker unit having a first drive unit that vibrates the first diaphragm with an audio signal supported and applied therein;
A magnetic second yoke formed in a cup shape, a second vibration film supported by the second yoke so as to cover the open end surface side of the second yoke, and the second yoke A second speaker unit having a second drive unit that vibrates the second diaphragm by an audio signal supported and applied therein,
Comprising
The first and second speaker portions are arranged so as to face each other so that the bottom portions of the first and second yokes are adjacent to each other with a space therebetween and between the first and second vibrating membranes are acoustically airtight. Are integrally disposed, and sound passage holes through which the sound generated by the vibrations of the first and second diaphragms is transmitted toward the second and first diaphragms are provided in the first and second diaphragms. The sound generated by driving the first and second vibrating membranes to be displaced and oscillating in the same direction is transmitted from the first or second speaker unit to the outside. Speaker device.   The speaker device according to claim 1, wherein the first and second speaker portions are each formed in the same shape.   The speaker device according to claim 1 or 2, wherein the first and second speaker units are arranged coaxially with each other.   The speaker device according to any one of claims 1 to 3, wherein outer peripheries of the first and second yokes are connected by an annular connecting member, and the first and second vibrating membranes are acoustically airtight. .   5. The speaker device according to claim 1, wherein the first and second driving units drive the first and second vibrating membranes with the audio signals having the opposite phases to each other. The first speaker unit includes a first magnet fixed in the first yoke and an open end surface side of the first yoke spaced from the end surface of the first magnet. The first vibration film supported by one yoke and the first vibration film supported by the first vibration film and inserted into the outer periphery of the first magnet with a slight gap therebetween. A cylindrical first coil that forms the drive section of
The second speaker unit includes a second magnet fixed in the second yoke and the open end surface side of the second yoke spaced from the end surface of the second magnet so as to cover the open end surface side of the second yoke. A second vibration film supported by two yokes, and a second vibration film supported by the second vibration film and inserted into the outer periphery of the second magnet with a slight gap therebetween. The speaker device according to claim 1, further comprising: a cylindrical second coil that forms a drive unit.   A third magnet that is close to and facing the first magnet of the first speaker unit with the same polarity, and a fourth magnet that is close to and facing the second magnet of the second speaker unit with the same polarity. The speaker device according to claim 6.   The speaker device according to claim 4, wherein the connecting member is formed with a small ventilation hole for ventilating inside and outside.   The speaker device according to any one of claims 1 to 7, wherein a plurality of fine small holes are formed in the first or second vibrating membrane disposed on a side where the sounded sound is propagated to the outside.

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