JP6108649B2 - Speaker device - Google Patents

Description

  The present invention relates to a speaker device, and more particularly to an improvement of a speaker device suitable for use in an earphone device such as an earphone or a headphone worn on a user's ear.

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

  In FIG. 6, 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 earphone device, the driving 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 from the outside with the cable 13. The transmitted sound is propagated from the sound hole 11 on the front surface of the diaphragm 7 to the outside.

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

  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.

  As an actual product, a coaxial type (see FIG. 7) in which the center axis of the sound passage cylinder 27 is aligned with the center axis of the vibration film 7, and the center axis of the sound passage cylinder body 27 is oblique to the center axis of the vibration film 7 And non-coaxial type (see FIG. 8). 7 and 8 show a state where the earphone device is attached to the left ear.

  Reference numeral 29 in FIGS. 7 and 8 is 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.

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

JP 2010-283634 A

  However, any of the above-described earphone devices has a configuration in which the yoke 3, the magnet 5, the vibration film 7 and the coil 9 arranged in the case body 1 are combined, and in this configuration, further high quality of driving sound is achieved. It is considered that there is a limit to the configuration in order to meet the user demands related to the increase in output and output.

  Therefore, as a result of earnestly examining various configurations in pursuit of further higher quality, the present inventor has found that by combining a plurality of speakers, it is possible to improve the drive sound quality and increase the output, The present invention has been 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 and increasing output.

In order to solve such a problem, a speaker device of the present invention includes a cylindrical main body frame, a first vibration film supported in the main body frame , and one surface side of the first vibration film. A first drive unit disposed in the main body frame for driving the first diaphragm by an applied audio signal; and on the other surface side of the first diaphragm, the first diaphragm a second vibrating membrane which is disposed in the body frame so as to face in the airtight state therebetween with placing the small distance, on the opposite side to the first diaphragm of the second vibrating membrane, the In the outer region surrounding the first drive unit, the second drive unit is annularly arranged in the main body frame , and the second direction in the same direction as the vibration direction of the first diaphragm by the first drive unit by the applied audio signal. A second drive unit for driving the diaphragm; It is provided.

In the speaker device of the present invention, the first drive unit is disposed in the main body frame so that the first drive unit faces the central region of the first diaphragm on one surface side, and is formed in a cup shape. The first yoke, a first magnet disposed in the first yoke and facing the central region of the first diaphragm, and fixed to the first diaphragm on one surface side thereof. A first coil having a cylindrical shape that is inserted and arranged at a small interval on the outer periphery of the first magnet, and the second drive unit is located on the opposite side of the first coil, and the center of the second diaphragm A magnetic second yoke disposed on the main body frame side so as to face the annular outer region surrounding the region, and disposed on the second diaphragm side of the second yoke. A ring-shaped second magnet facing the outer region, and a second Vibrating membrane is configured to have a second coil fixed inserted arranged cylindrically at a small distance to the inner periphery of the second magnet on the opposite side.

  The speaker device of the present invention can be configured such that the first and second coils drive the first and second vibrating membranes by audio signals having the same phase opposite to each other.

  The speaker device of the present invention may have a configuration in which the first and second coils are fixed on the first and second vibrating membranes in the same shape and position.

  The speaker device of the present invention may have a configuration in which the first and second vibrating membranes are formed in the same shape and arranged in parallel in the same direction.

In the speaker device according to the present invention, the first and second magnets are magnetized with different polarities on the sides facing the first and second vibrating membranes, and the first yoke has the first magnet. The second yoke has an annular projecting wall extending to the vicinity of the tip of the first vibrating membrane of the first magnet, and the second yoke has the second coil from the inner periphery to the first coil. A configuration having an annular inner wall extending to the vicinity of the tip of the second vibrating membrane of the two magnets is also possible.

  In such a speaker device of the present invention, the first diaphragm supported by the main body frame is driven to vibrate by the first drive unit disposed on one surface side of the first diaphragm, Since the second drive unit disposed on the other surface side of the first diaphragm is driven in the same direction as the first drive unit, it is possible to improve the quality of the drive sound and increase the output.

In the speaker device of the present invention, the first driving unit is disposed in the main body frame so as to face the central region of the first vibrating membrane on one surface side thereof, and is formed into a cup shape. The first yoke, a first magnet disposed in the first yoke and facing the central region of the first diaphragm, and fixed to the first diaphragm on one surface side thereof. A first coil having a cylindrical shape that is inserted and arranged at a small interval on the outer periphery of the first magnet, and the second drive unit is located on the opposite side of the first coil, and the center of the second diaphragm A magnetic second yoke disposed on the main body frame side so as to face the annular outer region surrounding the region, and disposed on the second diaphragm side of the second yoke. A ring-shaped second magnet facing the outer region, and the second Since a second coil fixed cylindrical inserted spaced a slight distance to the inner periphery of the second magnet on the opposite side to the vibrating membrane, in the magnet arrangement, the first and second The two first and second diaphragms are driven by this coil to reduce the odd-order distortion and improve the quality of the drive sound, and the output can be easily increased.

  In the speaker device of the present invention, when the first and second coils are configured to drive the first and second vibrating membranes by the audio signals having the opposite phases, the first and second vibrating membranes. The configuration of applying an audio signal to is simple.

  In the speaker device of the present invention, if the first and second vibrating membranes and the first and second coils have the same shape and the same configuration and are fixed, the first and second drive units As a result, there is little variation in the driving of the first and second diaphragms, and higher quality sound quality can be ensured.

  In the speaker device of the present invention, if the first and second vibrating membranes are formed in the same shape and are arranged in parallel in the same direction, the first and second vibrating membranes It is easy to narrow the interval between the two, and it is easy to reduce the overall shape.

  In the speaker device of the present invention, the first and second magnets are magnetized with different polarities on the sides facing the first and second vibrating membranes, and the first yoke extends from the outer periphery to the first magnet. The first yoke has an annular outer wall extending to the tip of the first magnet in the vicinity of the first vibration film, and the second yoke has the second coil between the inner periphery and the second coil. If the structure having the annular inner wall extending to the front end in the vicinity of the first vibrating membrane is used, the leakage magnetic flux from the first and second magnets is reduced and the magnetic flux density is improved, and the driving force is further increased and the sound quality is improved. Is easy.

1 is a longitudinal sectional view showing an embodiment of a speaker device according to the present invention. It is a principal part disassembled perspective view which shows the speaker apparatus of FIG. It is a wave form diagram explaining operation | movement of the speaker apparatus of FIG. It is an operation | movement waveform diagram which this invention and the conventional speaker apparatus show. It is the schematic explaining the operation | movement of the speaker apparatus of FIG. It is a longitudinal cross-sectional view which shows the conventional speaker apparatus. It is a longitudinal cross-sectional view which shows the conventional speaker apparatus with a usage example. It is a longitudinal cross-sectional view which shows the conventional speaker apparatus with a usage example.

  Hereinafter, embodiments of a speaker device according to the present invention will be described with reference to the drawings.

  FIG. 1 and FIG. 2 are a longitudinal sectional view and an exploded perspective view of main parts showing an embodiment of a speaker device according to the present invention. In FIG. 2, reference signs A and a, reference signs B and b, reference signs C and c, and reference signs D and d are the same with different viewing directions.

  1 and 2, the main body frame 31 is molded into a cup shape from an insulating magnetic material to form a first yoke 33, and has a recess 35 at the bottom. Reference numeral 37 denotes an annular projecting wall that projects from the opening edge of the recess 35 of the first yoke 33 (main body frame 31) to the vicinity of a first vibration film 49 described later.

  One end surface of a columnar first magnet 39 is overlaid at the center of the inner bottom of the recess 35 of the first yoke 33, and the other end surface (tip surface) of the first magnet 39 is the first yoke. It is located in the vicinity of the tip of 33 protruding walls 37.

  On the other end face of the first magnet 39, a disc-shaped holding plate 41 made of a magnetic material is overlaid.

  A radial first circuit board 43 is overlaid on the outer bottom of the recess 35 of the first yoke 33, and an electronic device (not shown) is connected to the first circuit board 43 by a cable (see FIG. 6) (not shown). Audio signal is supplied from

  The first yoke 33, the first magnet 39, the holding plate 41, and the first circuit board 43 are integrally and coaxially fixed by a cylindrical eyelet 45 penetrating through the central space. The tip of the protruding wall 37 of the first yoke 33 and the holding plate 41 are located at substantially the same position, and the tip of the protruding wall 37 of the first yoke 33 faces a holding plate 69 (second magnet 67) described later. Yes.

  In the first magnet 39, the concave portion 35 side of the first yoke 33 is magnetized to, for example, the S pole, the first vibration film 49 side described later is magnetized to the N pole, and the holding plate 41 is also the N pole.

  On the outer surface of the bottom side of the main body frame 31, a second circuit board 47 having a semi-ring plate shape is overlapped and fixed to the main body frame 31 on the outer periphery of the recess 35, and is not shown on the second circuit board 47. An audio signal is supplied from an electronic device (not shown) through a cable (see FIG. 6).

  The first vibration film 49 has a disk shape made of a conventionally known film material, and a central region 51 having a central portion bulged in a convex shape upward in the figure and a ring surrounding the central region 51. The outer edge 53 is fixedly supported so that the outer edge of the outer area 53 is closed on one side of the holding ring 55.

  The outer region 53 of the first vibration film 49 is formed with fine radial irregularities referred to as a so-called corrugation edge, and is in a slightly depressed state compared to the central region 51.

  The first vibrating membrane 49 is supported so as to close the open front end of the main body frame 31 by mounting and fixing the holding ring 55 on the open front end portion of the main body frame 31.

  On one surface side (lower surface side in the figure) of the first vibration film 49, a first coil (voice coil) is formed by winding a conducting wire in a cylindrical shape at the annular boundary between the central region 51 and the outer region 53. ) 57 is fixed so as to surround the central region 51, and the first coil 57 is inserted and arranged on the outer periphery of the first magnet 39 with a slight gap.

  Therefore, the first magnet 39 (restraining plate 41) and the protruding wall 37 of the first yoke 33 face each other in an annular manner so as to sandwich the first coil 57.

  On the same plane as the first coil 57 in the first vibration film 49, a lead wire (not shown) extends from the first coil 57 to the outer edge and is connected to the first circuit board 43. The first vibrating membrane 49 is vibrated by applying the audio signal to the first coil 57 via the.

  That is, the first drive unit 59 that vibrates and drives the first vibration film 49 by the first yoke 33, the first magnet 39, and the first coil 57 is provided on one surface side of the first vibration film 49. The so-called inner magnet type speaker is formed.

  On the other surface side (upper surface side in the drawing) of the first vibration film 49, a cover 61 formed in a cap shape from a metal material or a synthetic resin material is disposed so as to cover the first yoke 33. The cover 61 and the first yoke 33 form the main body frame 31 by being fitted and fixed to the outer periphery of the part. That is, the cover 61 also forms a part of the main body frame 31.

  A top portion of the cover 61 has a large diameter, and a second yoke 63 formed in a ring plate shape from a magnetic material is fixed to the inside of the top portion. The inner peripheral portion of the second yoke 63 is a cylindrical inner wall 65 and hangs in the direction of a second vibration film 71 described later.

The outer side of the second yoke 63 the inner wall 65 at the top inside of the cover 61, the second magnet 67 are overlapped annular, this second magnet 67 formed of a magnetic material in a ring-shaped A holding plate 69 is stacked and integrated.

  The holding plate 69, the second magnet 67, and the second yoke 63 are integrally and coaxially fixed by an adhesive (not shown), and the tip of the inner wall 65 of the second yoke 63 and the outside of the holding plate 69 are fixed. The peripheral edge is located at substantially the same position, and the tip of the inner wall 65 of the second yoke 63 faces the outer peripheral edge of the holding plate 41.

  The inner side of the top portion of the cover 61, the second magnet 67 and the holding plate 69 face an annular outer region 53 surrounding the central region 51 of the first vibration film 49.

  Between the holding plate 69 and the first vibration film 49 described above, the second vibration film 71 supported by the holding ring 55 is opposed to the first vibration film 49 with a slight gap therebetween. The space between the two vibrating membranes 45 and 71 is airtight.

  The second vibration film 71 has the same shape from the same material as the first vibration film 49, and has a central region 73 in which a central portion is bulged in a dome shape so as to protrude upward in the figure, and the central region. 73 and an annular outer region 75 surrounding the outer region 73, and the outer edge of the outer region 73 is fixedly supported by the retaining ring 55 so as to close it.

  That is, the first and second vibrating membranes 45 and 71 are formed in the same shape and are arranged in parallel in the same direction.

  In the second vibration film 71 on the side opposite to the first drive unit 59, the conducting wire is formed in a cylindrical shape in the same shape as the first coil 57 at the annular boundary between the central region 73 and the outer region 53. One end face side of the wound second coil (voice coil) 77 is fixed so as to surround the central region 73.

  The second coil 77 is inserted and arranged with a slight gap on the outer periphery of the second magnet 67 and with the inner wall 65 of the second yoke 63.

  Therefore, the second magnet 67 (restraining plate 69) and the inner wall 65 of the second yoke 63 face each other in an annular manner so as to sandwich the second coil 77, and the first and second coils 57 and 77 are The first and second vibrating membranes 49 and 71 are formed in the same shape and at the same position on one side of each other in the back state.

  A lead wire (not shown in FIG. 1) 71 a extends from the second coil 77 to the outer edge on the same plane as the second coil 77 in the second vibration film 71 and is connected to the second circuit board 47. The second vibration film 71 is vibrated by applying an audio signal to the second coil 77 via this.

  The second magnet 67 is magnetized with substantially the same magnetizing force as that of the first magnet 39. The second magnet 67 has an end on the second vibrating membrane 71 side, for example, an S pole, 2 of the yoke 63 is magnetized to the N pole, and the holding plate 69 is also the S pole.

  Moreover, the audio signal applied to the second coil 77 is the same as the audio signal applied to the first coil 57, but is connected and supplied so as to be applied in reverse phase. The second vibration film 71 is also vibrated by the second coil 77 in the same direction as the vibration direction of the first vibration film 49 by the first coil 57 according to the signal.

  That is, the second magnet 67, the second coil 77, and the second yoke 63 form a second drive unit 79 that vibrates and drives the second vibration film 71, thereby forming a so-called external magnet type speaker. Has been.

  After the first and second magnets 39 and 67 are assembled as a whole, for example, the first and second magnets 39 and 67 are sandwiched between the first and second magnets 39 and 67 by a magnetizing device (not shown).

  In the speaker device having such a configuration, for example, as shown in FIGS. 6 and 7 described above, the first yoke 33 side is disposed on the base 1a side of the case body 1, and the second yoke 63 is disposed on the front cover 1b side. The main body frame 31 is supported and fixed to the inner wall of the case main body 1 (the base 1a and the front cover 1b), and is commercialized as an earphone device, for example.

  In such a speaker device, the first and second drive units 59 and 79 are applied to the first and second vibrating membranes 49 and 79 by applying sound signals to the first and second coils 57 and 77. 71 is vibrated and sounded in the same direction, and the vibration sound is propagated to the outside.

  Then, the speaker device according to the present invention houses the case body 31 in the concha cavity 23 surrounded by the tragus 17, the tragus 19, and the concha 21 as shown in FIG. 7 described above, The tip of the ear tip is inserted into the ear canal and used.

  Moreover, in the speaker device of the present invention, the first and second vibrating membranes 49 and 71 are sandwiched between the first and second vibrating membranes 49 and 71 to form an inner magnet type speaker configuration and an outer magnet type speaker configuration. Since the second coils 57 and 77 are connected so that the same audio signals are applied in opposite phases, the first and second vibrating membranes 49 and 71 are connected by the first and second coils 57 and 77, respectively. Causes vibration displacement in the same direction, producing a loud vibration sound.

  In this regard, in the case of a single speaker as in the conventional configuration, when the input signal is large due to the speaker structure and the shape of the first diaphragm, the operation of the first diaphragm is in the upward (convex) direction and downward (concave). As shown in FIG. 3A or 3B, distortion is not likely to occur from one side of the vibration, and the vibration of the first vibrating membrane is difficult to be symmetric.

  However, in the present invention, as described above, the first and second vibrating membranes 49 and 71 opposed in the opposite directions vibrate simultaneously and in the same direction with the same vibration width, so that their distortions are complemented. As shown in the composite waveform of FIG. 3C, the vibrations of the first and second vibrating membranes 49 and 71 are likely to be symmetric, have little distortion, and have a large waveform.

  FIG. 4 is an operational waveform diagram showing the present invention and the conventional speaker device.

  4A is an input signal of a tone burst signal (550 Hz) for checking the speed of the operation response of the speaker of the speaker device, and FIG. 4B is a diagram in which the speaker device of the present invention is driven by the input signal. Is an output signal waveform (vibration waveforms from the first and second vibrating membranes 49 and 71) with respect to the input signal at the time, and FIG. 5C shows an output signal waveform when the conventional speaker device is driven by the input signal. It is.

  In FIG. 4, the horizontal axis represents the time axis, and the vertical axis represents the direction and magnitude of the waveform. The figure is measured separately to compare the waveform shapes, and the time axis shows the same. I have not done it.

  According to this, it can be seen that the speaker device of the present invention has good stability when there is no signal, and there is little disturbance in the peak portion of the signal, and the characteristics are good.

  Further, in the speaker device according to the present invention, since the leading end sides of the first and second magnets 39 and 67 facing each other are magnetized to different polarities, for example, the S pole and the N pole, the protrusions in the facing positional relationship that are close to each other. The tip of the wall 37 and the second magnet 67 (restraining plate 69) and the tip of the inner wall 65 and the first magnet 39 (restraining plate 41) have the same polarity, and magnetic pole repulsion is likely to occur.

  Therefore, as shown in FIG. 5A, the front end side of the first or second magnet 39, 67 and the protruding wall 37 (or inner wall 65) of the first yoke 33 (or second yoke 63) adjacent thereto. Is difficult to spread due to the influence of the south and north poles of the inner wall 65 or the protruding wall 37 facing each other.

  Thereby, it is easy to suppress the generation of leakage magnetic flux between the first magnet 39 and the protruding wall 37 of the first yoke 33 and between the second magnet 67 and the inner wall 65 of the second yoke 63. Since the magnetic flux density increases, the driving loss of the first and second vibrating membranes 49 and 71 can be reduced.

  In this regard, in the speaker alone as in the conventional configuration, as shown in FIG. 5B, for example, the magnetic flux is formed to spread to some extent between the tip side of the first magnet 39 and the protruding wall 37 of the first yoke 33, Leakage magnetic flux is generated and it is difficult to ignore the loss.

  In FIG. 5, the first and second coils 57 and 77 and the first and second vibrating membranes 49 and 71 are not shown.

  Thus, in the speaker device of the present invention, the cylindrical main body frame 31, the first vibration film 49 supported by the main body frame, and the main body frame on one surface side of the first vibration film 49. 31, and a first drive unit 59 that drives the first vibration film 49 by an applied audio signal, and the first vibration film on the other surface side of the first vibration film 49. The second vibration film 71 disposed on the main body frame 31 side so as to face with a slight space between the first vibration film 49 and the first vibration film 49 of the second vibration film 71. On the opposite surface side, an annular arrangement is provided on the main body frame 31 side in a region surrounding the first drive unit 59, and the vibration direction of the first diaphragm 49 by the first drive unit 59 is determined by the applied audio signal. The second in the same direction And it comprises a second drive unit 79 for driving the vibrating film 71, a.

  In addition, the first drive unit 59 is disposed in the main body frame 31 so as to face the central region 51 of the first vibration film 49 on one surface side thereof, and is formed in a cup shape. The first yoke 33, the first magnet 39 disposed in the first yoke 33 and facing the central region 51 of the first vibration film 49, and one surface of the first vibration film 49 on the one surface And a cylindrical first coil 57 that is inserted and arranged at a slight interval around the outer periphery of the first magnet 39, and the second drive unit 79 is on the opposite surface side. A magnetic second yoke 63 disposed on the main body frame 31 (cover 61) side so as to face the annular outer region 75 surrounding the central region 73 of the second vibration film 71, and formed in a ring shape. The second vibration of the second yoke 63 A ring-shaped second magnet 67 that is disposed on the 71 side and faces the outer region 75, and is fixed to the second vibrating membrane 71 on the opposite surface side with a slight gap between the inner periphery of the second magnet 67. It has a configuration having a cylindrical second coil 77 placed and inserted.

  Therefore, since the first and second vibration films 49 and 71 are driven in the same direction by the first and second drive portions 59 and 79, the first and second vibration films 49 and 71 are greatly displaced and vibrated. As a result, the output can be increased and the driving sound can be improved in quality.

  That is, the two first and second coils 57 and 77 drive the two first and second vibrating membranes 49 and 71 to reduce odd-order distortions that are considered to have an adverse effect on sound quality. Since it is easy to obtain substantially symmetrical vibrations in the upward and downward directions, it is possible to obtain a drive sound that is responsive and crisp, and it is possible to improve the quality of the drive sound while maintaining an increase in the drive sound.

  The first and second coils 57 and 77 of the first and second drive units 59 and 79 drive the first and second vibrating membranes 49 and 71 with the same audio signals having opposite phases. This can be implemented only by connecting and supplying audio signals, and the configuration of supplying and supplying audio signals to the first and second coils 57 and 77 is simple.

  In addition, in the speaker device of the present invention, since the opening areas of the first and second vibrating membranes 49 and 71 are large, it is possible to improve mainly the response in the high range, and the two first and second sheets Since the vibration films 49 and 71 are used, the sound quality can be easily adjusted.

  In addition, since the first and second vibrating membranes 49 and 71 have the same shape and are unevenly arranged in the same direction, the interval between the first and second vibrating membranes 49 and 71 can be reduced. Since the distance between both the first and second drive units 59 and 79 is close, there is an advantage that a higher magnetic flux density can be obtained in the gap of the magnetic circuit as described above.

  Furthermore, in the speaker device of the present invention, the first and second magnets 39 and 67 are magnetized with the first and second vibrating membranes 49 and 71 facing to the first and second vibrating membranes 49 and 71 with different polarities. The yoke 33 has an annular projecting wall 37 extending to the tip of the first magnet 39 in the vicinity of the first vibration film 49 with the first coil 57 interposed therebetween, and the second yoke 63 extends from the inner periphery to the first yoke 57. Since it has an annular inner wall 65 extending to the tip of the second magnet 67 in the vicinity of the second vibration film 71 between the two coils 77, the leakage flux is reduced, the magnetic flux density is improved, and the driving force is increased. In addition to ensuring high quality sound quality, the magnetizing configuration and the magnetizing operation are also simple.

  Furthermore, in the speaker device of the present invention, the support configuration of the first and second vibrating membranes 49 and 71 is not limited to the above-described configuration, and the first and second drive units 59 and 79 are also limited to the above-described configuration. Instead, the first and second driving units 59 and 79 may be configured to vibrate and drive the first and second vibrating membranes 49 and 71 in the same direction by the same applied audio signal.

  The formation position of the second drive unit 79 is the region surrounding the first drive unit 59 on the second vibration film 71 on the side opposite to the first vibration film 49, that is, the first drive part 79. What is necessary is just to arrange | position circularly in the area | region which removed the formation area of the drive part 59. FIG.

  Moreover, the second drive unit 79 can be configured to be directly or indirectly disposed on the main body frame 31 in addition to the structure disposed on the cover 61, and may be disposed on the main body frame 31 side. .

  By the way, when the speaker device according to the present invention is applied to an earphone device, as shown in the above-described conventional configuration, the central axis of the sound passage cylinder 27 is set to the central axis of the first and second vibrating membranes 49 and 71. It can be implemented in the aligned coaxial type (see FIG. 7) or the non-coaxial type (see FIG. 8) in which the central axis of the sound passage cylinder 27 is obliquely set to the central axis of the first and second vibrating membranes 49 and 71. It is.

  Further, in the speaker device of the present invention, the first and second vibrating membranes 49 and 71 are caused to be in contact with the first and second vibrating membranes 49 and 71 by causing an air pressure change between the first and second vibrating membranes 49 and 71. There may be worries about deformation.

  In order to cope with this, it is advisable to form small holes (not shown) in the first and second vibrating membranes 49 and 71 so as not to affect good vibration frequency characteristics. 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, a small hole that does not affect the vibration frequency characteristics is formed through the first and second vibrating membranes 49 and 71, 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 49 and 71 due to a change in atmospheric pressure and to control the frequency characteristics of the high sound range, for example, the first vibrating membrane 49 is provided with low sound, and the second For the two purposes of giving the diaphragm 71 a high sound, one or both of the first and second diaphragms 49, 71 are provided with a small hole having the same or different inner diameter of about 50 to 500 microns. Is also possible.

  In short, if a small hole that hardly affects the frequency characteristics is formed in at least one of the first and second vibrating membranes 49 and 71, the frequency characteristics are finely adjusted within a range that does not significantly affect the frequency characteristics. Is possible.

  Thus, in the apparatus of the present invention, the airtight state between the first and second vibrating membranes 49 and 71 is not a complete or strict airtight or sealed state, as long as it does not affect the vibration frequency characteristics. If the first and second vibrating membranes 49 and 71 can vibrate integrally, for example, the above-described small holes and slight gaps can be formed.

  The speaker device according to the present invention is not limited to the earphone device, and can be widely applied to large or small headphones or a hi-fi speaker configuration.

DESCRIPTION OF SYMBOLS 1 Case main body 1a Base 1b Front cover 3 Yoke 5 Magnet 7 Vibration membrane 9 Cylindrical coil 11 Sound passage hole 13 Cable 15 Drive part 17 Tragus 19 Pair of beads 21 Ear concha 23 Ear concha cavity 25 Ear canal 27 Sound passage cylinder 29 Ear tips (ear pads, ear pieces)
31 Main body frame 33 First yoke 35 Recess 37 Projecting wall 39 First magnet 41, 69 Holding plate 43 First circuit board 45 Eyelet 47 Second circuit board 49 First vibration film 51, 73 Central region 53, 75 Outer region 55 Retaining ring 57 First coil (voice coil)
77a Lead wire 59 1st drive part 61 Cover 63 2nd yoke 65 Inner wall 67 2nd magnet 71 2nd vibration film 77 2nd coil (voice coil)
79 Second drive unit

Claims (5)

A cylindrical body frame;
A first diaphragm which is supported on the body frame,
A first drive unit disposed in the main body frame on one surface side of the first diaphragm and driving the first diaphragm by an applied audio signal;
In the other surface side of said first diaphragm, said first diaphragm and the second diaphragm disposed in said body frame so as to face in the meantime airtight with placing small distance ,
The opposite surface side to the first vibrating membrane of the second vibrating membrane, the circularized arranged on a first of said body frame In the outer region surrounding the drive unit, said by the audio signal applied A second drive unit that drives the second diaphragm in the same direction as the vibration direction of the first diaphragm by the first drive unit;
Comprising
The first driving unit is disposed in the main body frame so as to face the central region of the first vibration film on the one surface side, and is formed in a cup-shaped magnetic yoke. A first magnet disposed in the first yoke and facing a central region of the first diaphragm, and an outer periphery of the first magnet fixed to the first diaphragm on the one surface side And a cylindrical first coil inserted and arranged at a slight interval between
The second driving unit is disposed in the body frame so as to face the annular outer region surrounding the central region of the second vibration film on the opposite surface side, and is formed in a ring shape. A second yoke having physical properties, a second magnet in a ring shape that is disposed on the second vibrating membrane side of the second yoke and faces the outer region, and the opposite surface to the second vibrating membrane And a cylindrical second coil which is fixed on the side and inserted and arranged at a slight interval on the inner periphery of the second magnet . 2. The speaker device according to claim 1, wherein the first and second coils drive the first and second diaphragms with the audio signals having the same phase opposite to each other. The speaker device according to claim 1 or 2, wherein the first and second coils are fixed on the first and second vibrating membranes in the same shape and the same position. The speaker device according to claim 1, wherein the first and second vibrating membranes are formed in the same shape and are arranged in parallel in the same direction. The first and second magnets are magnetized with different polarities on the sides facing the first and second vibrating membranes, and the first yoke has the first coil interposed therebetween. An annular projecting wall extending to the vicinity of the tip of the first vibrating membrane of the first magnet, and the second yoke includes the second magnet and the second magnet between the second coil and the second coil. 6. The speaker device according to claim 2, further comprising an annular inner wall extending to the vicinity of the tip of the vibration film.

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