JP2012100233A - Thin double-sided speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin double-sided speaker allowing a user to tilt each of the high-bandwidth sounds output from the both sides to a desired direction.SOLUTION: A thin double-sided speaker includes: a large number of linear pattern 12 corresponding to a neutral zone of a permanent magnet plate formed on a diaphragm disposed between two units of the permanent magnet plates; and two sound emitting surfaces for emitting sounds to the opposite direction from each other. The diaphragm is divided into two or more vibration areas 15a and 15b, and wiring patterns 11a and 11b connected to linear patterns 12 are formed for each of the vibration areas 15a and 15b. Consequently, if driving signals of different delay time are provided with respect to the wiring patterns 11a and 11b, the orientation of the two sound emitting surfaces can be tilted to the same direction with respect to the front direction.

Description

  The present invention relates to a thin double-sided speaker, and more particularly to an improvement of a thin double-sided speaker that can emit sound from both sides of a flat thin casing.

  A diaphragm is disposed in a gap (gap) between two permanent magnet plates, and a drive current is supplied to a wiring pattern formed on the diaphragm, thereby vibrating the diaphragm within the gap, thereby obtaining a permanent magnet plate. There is known a thin double-sided speaker that can emit sound from both sides through sound emitting holes formed in each of them (for example, Patent Document 1).

  This type of thin double-sided speaker has two sound emitting surfaces directed in opposite directions, and can emit sound waves having opposite phases. In addition, a plane wave with high straightness is emitted from each sound emitting surface, and directivity in the front direction of the sound emitting surface is high. For this reason, it is thought that it is suitable for the use for which it is calculated | required that a fixed sound pressure is ensured within an elongate area, for example, the speaker for station premises broadcasting installed in the platform of a station.

  FIG. 15 is a diagram showing an installation example of a conventional thin double-sided speaker 200. In the figure, a thin double-sided speaker 200 is installed on the platform ceiling so that the front surface of the sound emitting surface coincides with the longitudinal direction of the platform. Since the thin double-sided speaker 200 has two sound emitting surfaces facing in opposite directions, a sound field can be formed in both directions on the platform with the thin double-sided speaker 200 interposed therebetween. Further, due to the straightness of the plane wave, a constant sound pressure can be ensured even at a relatively far position on the platform. On the other hand, there is a problem that it is difficult to hear sound near the lower part of the thin double-sided speaker, and in particular, there is a problem that high sound is difficult to hear because high sound has higher directivity than low sound.

  In such a case, if it is a general speaker that is not a double-sided type, by installing the sound emitting surface downward from the horizontal direction, the sound pressure and sound quality in the distance, the sound pressure in the diagonally downward direction and The sound quality can be balanced. However, in the case of a thin double-sided speaker, since one sound emitting surface faces downward and the other sound emitting surface faces upward, the merit of the thin double-sided speaker 200 is that a sound field can be formed on both sides. There was a problem that it was not possible to save.

JP-A-9-331596

  The present invention has been made in view of the above circumstances, and is a thin type capable of controlling both high-band sounds of sound bands output from both sides of a thin double-sided speaker so as to reach a desired direction. An object is to provide a double-sided speaker.

  The thin double-sided speaker according to the first aspect of the present invention has a multipolar magnetization pattern in which strip-like N poles and S poles that are parallel to each other appear alternately, and a large number of sound emitting holes are formed in a neutral zone between different poles. Two diaphragms, and a diaphragm disposed between the two permanent magnet plates facing the same pole and having a large number of linear patterns corresponding to the neutral zone. Are divided into two or more vibration areas each composed of two or more adjacent linear patterns, and the linear patterns are connected to each of the vibration areas so that the same drive signal with different delay times can be supplied. The wiring pattern is formed.

  In the neutral zone, the magnetic field perpendicular to the permanent magnet plate is weak and the magnetic field parallel to the permanent magnet plate is strong. For this reason, if a diaphragm is arranged between two permanent magnet plates and a large number of linear patterns corresponding to the neutral zone are formed on the diaphragm, the thickness of the diaphragm is increased by supplying a drive signal to the linear pattern. Vibrating in the direction, the vibration sound can be emitted from the sound emission hole of the permanent magnet plate.

  In such a thin double-sided speaker, the diaphragm is divided into two or more vibration areas adjacent to each other, and a wiring pattern is formed by connecting a linear pattern for each vibration area, and the delay time is made different for each wiring pattern. If the same drive signal is supplied, by adjusting the delay time, it is possible to control so that both high-band sounds out of the sound bands output from both sides reach a desired direction.

  In the thin double-sided speaker according to the second aspect of the present invention, in addition to the above-described configuration, the vibration area is formed of a rectangle and is configured to be adjacent to each other with one side facing each other.

  With such a configuration, it is possible to bring the vibration areas to which the same drive signals with different delay times are supplied close to each other, thereby realizing high-band directivity control.

  In the thin double-sided speaker according to the third aspect of the present invention, in addition to the above configuration, a gap regulating member that penetrates the diaphragm and regulates a gap between the permanent magnet plates is disposed in the vibration area or between the vibration areas. Has been.

  With such a configuration, the distance between the permanent magnet plates can be made uniform, and the speaker characteristics can be improved. In particular, even if the area of the permanent magnet plate is increased in order to divide the diaphragm into two or more vibration areas, the permanent magnet plate is deflected by the exclusion force between the magnets, and the distance between the permanent magnets becomes uneven. Can be prevented.

  In the thin double-sided speaker according to the fourth aspect of the present invention, in addition to the above configuration, the linear pattern has a bypass pattern that bypasses the gap regulating member. With such a configuration, it is possible to arrange a linear pattern for a region that interferes with the through hole of the diaphragm if a linear pattern is arranged, and a wider vibration area can be formed on the diaphragm having the same area. Can be secured.

  In the thin double-sided speaker according to the fifth aspect of the present invention, in addition to the above configuration, the permanent magnet plate has a through hole facing the detour pattern. With such a configuration, it is possible to suppress the electromagnetic force that is caused by the interaction between the permanent magnet plate and the detour pattern and vibrates in the opposite phase direction or the in-plane direction, and it is possible to prevent the deterioration of the speaker characteristics.

  ADVANTAGE OF THE INVENTION According to this invention, the small thin double-sided speaker which can control a directivity direction can be provided. In particular, it is possible to provide a small thin double-sided speaker capable of tilting the directivity directions of the two sound emitting surfaces in the same direction.

1 is an external view of a thin double-sided speaker 100 according to Embodiment 1 of the present invention. FIG. 2 is a developed perspective view of the thin double-sided speaker 100 of FIG. 1. It is sectional drawing by the AA cutting line of the thin double-sided speaker 100 of FIG. FIG. 3 is a plan view of the diaphragm 1 of FIG. 2. It is a top view of the permanent magnet plate 2 of FIG. It is the figure which showed an example of the loudspeaker system using the thin double-sided speaker 100 of FIG. 4 is an explanatory diagram schematically showing directivity characteristics of the thin double-sided speaker 100. FIG. It is the figure which showed the frequency characteristic of the sound pressure level of a front direction (0 degree direction) about the directivity of the loudspeaker system of FIG. It is the figure which showed the frequency characteristic of the sound pressure level of 5 degree downward direction (-5 degree direction) about the directivity of the loudspeaker system of FIG. It is the figure which showed the frequency characteristic of the sound pressure level of a 10 degree downward direction (-10 degree direction) about the directional characteristic of the loudspeaker system of FIG. It is the figure which showed the frequency characteristic of the sound pressure level of 15 degree downward direction (-15 degree direction) about the directional characteristic of the loudspeaker system of FIG. FIG. 6 is a plan view showing one configuration example of a diaphragm 1 for a thin double-sided speaker 100 according to Embodiment 2 of the present invention. It is the top view which showed one structural example of the diaphragm 1 about the thin double-sided speaker 100 by Embodiment 3 of this invention. FIG. 6 is a plan view showing one configuration example of a diaphragm 1 for a thin double-sided speaker 100 according to a fourth embodiment of the present invention. It is the figure which showed the example of installation of the conventional thin double-sided speaker 200. FIG.

Embodiment 1 FIG.
1 to 3 are views showing an example of the configuration of a thin double-sided speaker 100 according to Embodiment 1 of the present invention. FIG. 1 is an external view of the thin double-sided speaker 100, and FIG. FIG. 3 is a sectional view taken along the line AA of FIG. 1. The thin double-sided speaker 100 has a thin rectangular flat plate shape sandwiched between two casing panels 3 and can emit plane waves from the two casing panels 3 respectively. That is, the housing panel 3 serves as a sound emitting surface and emits sound from the two sound emitting surfaces in directions opposite to each other.

  The thin double-sided speaker 100 includes one diaphragm 1, two permanent magnet plates 2, two casing panels 3, two casing frames 4, two buffer sheets bs, and two filters ft. ing. The two permanent magnet plates 2 are arranged to face each other so as to sandwich the diaphragm 1, and by supplying a drive signal to the wiring pattern 11 of the diaphragm 1, the diaphragm is placed in the gap between the permanent magnet plates 2. 1 can be vibrated in the thickness direction. The two casing panels 3 are arranged to face each other so as to sandwich the two permanent magnet plates 2, and the casing frame 4 is arranged to cover the end surface of the permanent magnet plates 2. Further, two buffer sheets bs are respectively disposed between the diaphragm 1 and the permanent magnet plate 2, and two filters ft are respectively disposed between the permanent magnet plate 2 and the housing panel 3.

  The diaphragm 1 is a flexible film on which a wiring pattern 11 is formed. For example, the wiring pattern 11 made of copper is formed on a resin film made of polyimide. The wiring pattern 11 is a meandering pattern obtained by connecting a large number of parallel linear patterns 12, and is connected to a power feeding terminal 1 t erected at a corner portion of the diaphragm 1. The power supply terminal 1 t is connected to the external terminal et through the terminal hole 4 t of the housing frame 4 and the terminal hole 3 t of the housing panel 3. For this reason, a drive signal can be supplied from the external terminal et to the wiring pattern 11 via the power supply terminal 1t. Further, the wiring pattern 11 is formed on both surfaces of the diaphragm 1, and the same pattern is formed at the same position so that the linear pattern 12 overlaps with the diaphragm 1 interposed therebetween.

  The permanent magnet plate 2 is a plate-like permanent magnet, and a multipolar magnetization pattern is formed on the inner main surface facing the diaphragm 1. This multipolar magnetization pattern is a pattern in which a large number of N poles and S poles are arranged in parallel to each other so that strip-like N poles and S poles appear alternately. A belt-like neutral zone in which the magnetic field perpendicular to the permanent magnet plate 2 is minimized is formed between the adjacent N and S poles. A large number of sound emitting holes 2h penetrating the permanent magnet plate 2 are formed on the neutral zone.

  The two permanent magnet plates 2 are arranged so that the linear pattern 12 of the diaphragm 1 is sandwiched between the neutral zones facing each other with the same poles facing each other. In general, the magnetic field parallel to the permanent magnet plate 2 is maximum in the neutral zone, but by making the same poles of the permanent magnet plate 2 face each other, the magnetic flux density in the magnetic field can be further increased. If the linear pattern 12 of the diaphragm 1 is arranged at a position corresponding to such a neutral zone, the electromagnetic force for vibrating the diaphragm 1 in the thickness direction can be generated most efficiently.

  The housing panel 3 and the housing frame 4 constitute a housing that houses the permanent magnet plate 2. The diaphragm 1 is sandwiched between two casing frames 4, and the casing 1 is sandwiched between the two casing panels 3, so that the diaphragm 1 is attached to the thin double-sided speaker 100. It is supported at the center in the thickness direction. The plate-shaped housing panel 3 covers the outer main surface of the permanent magnet plate 2, and the frame-shaped housing frame 4 covers the side surfaces of the permanent magnet plate 2. Leakage is prevented. Further, the housing panel 3 is provided with a large number of sound emitting holes 3 h that penetrate the housing panel 3. These sound emission holes 3 h are formed at positions corresponding to the sound emission holes 2 h of the permanent magnet plate 2, and the sound generated by the vibration of the diaphragm 1 is generated by the sound emission holes 2 h of the permanent magnet and the housing panel 3. The sound is released from the housing panel 3 into the free space through the sound emitting hole 3h.

  The buffer sheet bs is a buffer material for preventing the generation of abnormal noise due to the collision between the diaphragm 1 and the permanent magnet plate 2, and a material having good air permeability, for example, a nonwoven fabric is used. The thickness of the buffer sheet bs is smaller than the distance between the diaphragm 1 and the permanent magnet plate 2, and a space in which the diaphragm 1 can vibrate is formed between the diaphragm 1 and the buffer sheet bs. The filter ft is a dustproof material for preventing dust from entering from the outside, and a material having good air permeability is used.

  The three sets of bolts 20, the spacers 21, and the nuts 22 are fastening means for fastening the two casing panels 3 to each other and restricting the interval between them, and are provided on the inner side of the peripheral edge on the casing panel 3. Yes. The spacer 21 passes through the fastening holes 1j and 2j, penetrates the diaphragm 1 and the permanent magnet plate 2, and has a cylindrical body in which both ends thereof are in contact with the inner main surface of the housing panel 3. After passing through the spacer 21 and traversing the two casing panels 3, the nuts 22 are screwed together. That is, the gap width of the permanent magnet plate 2 sandwiched between the casing panels 3 can also be regulated by the fastening means regulating the interval between the casing panels 3. That is, the fastening means functions as a gap regulating means for the permanent magnet plate 2.

  When the same poles of the permanent magnet plates 2 are opposed to each other, an exclusion force acts between the permanent magnet plates 2. For this reason, when only the periphery of the permanent magnet plate 2 is supported, the permanent magnet plate 2 bends due to the rejecting force, the gap near the center of the main surface increases more than the periphery, and the speaker characteristics deteriorate. Therefore, if the gap width of the permanent magnet plate 2 is regulated near the center of the main surface of the housing panel 3 and the gap between the permanent magnet plates 2 is made uniform, the speaker characteristics can be improved and the quality of each product can be improved. Variations can be suppressed.

  Here, the example in which the gap width between the permanent magnet plates 2 is regulated by the fastening means for fastening the two casing panels 3 to each other has been described. It goes without saying that the gap width may be regulated by fastening the plates 2 to each other. Further, the gap regulation of the permanent magnet plate 2 is desirably performed near the center of the main surface. However, when two or more gap regulating means are provided, the permanent magnet plate 2 may be arranged at a position that is symmetric with respect to the center of the main surface. .

  FIG. 4 is a diagram illustrating a detailed configuration example of the thin double-sided speaker 100 of FIG. 1, and a plan view of the diaphragm 1 is shown. The diaphragm 1 is divided into two vibration areas 15a and 15b, and two wiring patterns 11a and 11b independent of each other are formed in association with the vibration areas 15a and 15b. A large number of linear patterns 12 formed so as to be parallel to each other on the diaphragm 1 are divided into two groups such that each group is composed of adjacent linear patterns 12, and the vibration areas 15a and 15b are divided. Is defined as an arrangement region of the linear patterns 12 belonging to each group. That is, each vibration area 15a, 15b is an area obtained by dividing the diaphragm 1 by a straight line parallel to the linear pattern 12, and is a rectangular area adjacent to each other with each side facing each other.

  The wiring pattern 11a is formed as a meandering pattern in which two or more linear patterns 12 formed in the vibration area 15a are connected. Similarly, the wiring pattern 11b is formed as a meandering pattern in which two or more linear patterns 12 formed in the vibration area 15b are connected. The wiring patterns 11a and 11b are connected to different power supply terminals 1t. By supplying different drive signals to these power supply terminals 1t, the vibration areas 15a and 15b are vibrated independently of each other. be able to. In the figure, since the three fastening holes 1j are all formed between the vibration areas 15a and 15b and restrict the gap of the permanent magnet plate 2 at a position other than the peripheral portion of the diaphragm 1, the permanent magnet plate The two gaps can be made uniform.

  Here, when the fastening hole 1j is provided between the vibration areas 15a and 15b, a non-vibration area having a width larger than the diameter of the fastening hole 1j is formed between the vibration areas 15a and 15b, and the areas of the vibration areas 15a and 15b. This causes a problem of narrowing. Therefore, the non-vibration area is minimized by using a detour straight line pattern 12m having a detour pattern 12n that detours the fastening hole 1j.

  The detour straight line pattern 12m is a pattern in which a portion of the straight line pattern 12 that interferes with the fastening hole 1j is replaced with a detour pattern 12n having a non-linear shape, and the straight line pattern divided into two or more by the fastening hole 1j is a detour pattern. This is a pattern in which 12n are connected. Further, the straight line pattern 12 having a portion that interferes with the adjacent detour straight line pattern 12m can be similarly replaced with the detour pattern 12n to obtain the detour straight line pattern 12m. That is, by arranging the detour straight line pattern 12m in one vibration area 15a (15b) and near the boundary with the other vibration area 15b (15a), the non-vibration area is narrowed, and the vibration areas 15a, 15b The area of can be expanded.

  FIG. 5 is a diagram showing a detailed configuration example of the thin double-sided speaker 100 of FIG. 1, and a plan view of the permanent magnet plate 2 is shown. What is indicated by a broken line in the drawing is a position on the permanent magnet plate 2 corresponding to the wiring pattern 11 on the diaphragm 1 and the fastening hole 1j.

  The sound emitting hole 2h is formed on a number of belt-like neutral zones formed in parallel to each other. Since the permanent magnet plate 2 has a large number of N poles and S poles arranged alternately and at equal intervals on its main surface, each of the many neutral zones formed at the center between the different poles has a belt-like shape. It is formed to be equidistant and parallel. For this reason, it is easy to associate the neutral zone pattern of the permanent magnet plate 2 with the linear pattern 12 of the diaphragm 1, but it is not possible to associate it with the detour pattern 12n. Moreover, it is difficult to form an irregular neutral zone pattern that can also be associated with the bypass pattern 12n.

  However, when the bypass pattern 12n is opposed to the N-pole or S-pole region other than the neutral zone, an electromagnetic force that vibrates the diaphragm 1 in the opposite phase direction or in-plane direction is generated, and the speaker characteristics are deteriorated. End up. For this reason, by expanding the fastening hole 2j so that the fastening hole 2j of the permanent magnet plate 2 faces not only the fastening hole 1j of the diaphragm 1 but also the bypass pattern 12n of the diaphragm 1, the bypass pattern 12n becomes , It is prevented from facing the permanent magnet plate 2 other than the neutral zone.

  FIG. 6 is a diagram showing an example of a loudspeaker system using the thin double-sided speaker 100 of FIG. In this loudspeaker system, the directional direction can be tilted with respect to the front direction by supplying a delayed drive signal to one of the vibration areas 15a and 15b.

  The thin double-sided speaker 100 is attached to the ceiling and is suspended from the ceiling so that the front direction of the housing panel 3 is in the horizontal direction. For example, as an on-site broadcasting facility of a station, the front direction of each casing panel 3 is made coincident with the longitudinal direction of the platform and attached to the ceiling of the platform. The diaphragm 1 is divided into an upper vibration area 15a and a lower vibration area 15b, and two wiring patterns 11a and 11b corresponding to these vibration areas 15a and 15b are formed. By supplying a drive signal delayed from the upper wiring pattern 11a to the line 11b, the directing direction is directed downward from the horizontal direction.

  The drive signal output from the sound source device 50 is supplied to the delay circuit 51 and the upper wiring pattern 11a, while the drive signal delayed by the delay circuit 51 is supplied to the lower wiring pattern 11b. The delay circuit 51 is a circuit that delays the drive signal by a predetermined time at least for the audio band. For example, a low-pass filter circuit composed of LC elements has characteristics that the amplitude is substantially constant and the phase delay angle increases in proportion to the frequency within the passband. Therefore, by using such a low-pass filter circuit, it is possible to realize a delay circuit in which the delay time is constant for each frequency band in the audio band.

  The delay distance D in the figure indicates the distance that the sound wave travels during the delay time in the delay circuit 51, and the sound wave from the upper vibration area 15a (wiring pattern 11a) and the lower vibration area 15b (wiring pattern). The wave front in which the phases of the sound waves from 11b) are aligned is inclined downward from the horizontal direction. For this reason, the pointing direction can be directed downward from the front direction. In addition, since the directivity directions of the two housing panels 3 can be simultaneously tilted downward, the sound pressures at the far side are respectively on both sides of the thin double-sided speaker 100 with the directivity directions of the two sound emitting surfaces facing downward. The sound quality and the sound pressure and sound quality in the diagonally downward direction of the speaker can be balanced.

  FIG. 7 is an explanatory view schematically showing the directivity characteristics of the thin double-sided speaker 100. 53H and 53L in the figure are directivity characteristics at frequencies in the voice band, and the directivity characteristics 53H relate to frequencies higher than the directivity characteristics 53L. As shown in FIG. 7, the thin double-sided speaker 100 has higher directivity as the frequency becomes higher. For this reason, when the thin double-sided speaker 100 is attached to the ceiling, a low tone can be heard near the diagonally lower side, but a high tone is difficult to hear. However, by using the loudspeaker system of FIG. 6 and tilting the directing direction downward, both low and high sounds can be easily heard even in the vicinity of the obliquely lower side of the thin double-sided speaker 100.

  8 to 11 are diagrams showing the measurement results of the directivity characteristics of the loudspeaker system of FIG. 6, and the measurement results in three directions are related to the sound pressure level at a position away from the thin double-sided speaker 100. It is shown. 8 is a front direction (0 ° direction) of the housing panel 3, FIG. 9 is a direction 5 ° downward from the front direction (−5 ° direction), and FIG. 10 is a direction 10 ° downward from the front direction. (−10 ° direction), FIG. 11 shows the frequency characteristics of the sound pressure level in the direction (−15 ° direction) downward by 15 ° from the front direction. Further, the solid line 55 in the figure is the frequency characteristic when the drive signal of the lower wiring pattern 11b is delayed, and the broken line 56 is the frequency characteristic when it is not delayed.

  According to this measurement result, in the band of 5 kHz or less with low directivity, there is almost no difference in the sound pressure level regardless of which direction is compared and whether the characteristics 55 and 56 in the same direction are compared. Absent. However, if attention is paid to a band higher than 5 kHz, it can be seen that the magnitude relationship between the sound pressure levels of the characteristics 55 and 56 is reversed depending on the direction. That is, in the 0 degree direction, the sound pressure level of the characteristic 56 that is not delayed is larger, but in the −5 ° direction, the sound pressure levels of the characteristics 55 and 56 are almost equal, and in the −10 ° direction, the delayed sound characteristic level is obtained. The sound pressure level of 55 is higher. Further, in the -15 ° direction, a dip (drop) near 7 kHz that occurs in the non-delayed characteristic 56 does not occur in the delayed characteristic 55, and it is easy to hear a sound near 7 kHz. Recognize. That is, by delaying the drive signal to the wiring pattern 11b compared to the drive signal to the wiring pattern 11a, the directing direction can be directed downward in the frequency band of 5 to 15 kHz, and the listening is performed obliquely downward. It turns out that it is easy.

  In the thin double-sided speaker 100 according to the present embodiment, the diaphragm 1 is disposed between two permanent magnet plates 2 and a large number of linear patterns 12 corresponding to the neutral zone are formed on the diaphragm 1. For this reason, by supplying a drive signal to the linear pattern 12, the diaphragm 1 can be vibrated in the thickness direction, and the vibration sound can be emitted from the sound emission holes 2 h of the permanent magnet plate 2.

  In such a thin double-sided speaker 100, the diaphragm 1 is divided into two or more vibration areas 15a and 15b, and wiring patterns 11a and 11b are formed by connecting the linear pattern 12 to each vibration area 15a and 15b. For this reason, if different drive signals are supplied to the wiring patterns 11a and 11b, different sounds can be generated for each vibration area. Therefore, the same diaphragm 1 can be vibrated for each of the two or more vibration areas 15a and 15b and used as two or more speakers. In addition, since one diaphragm is used by being divided into two or more vibration areas, the size of the apparatus can be greatly reduced as compared with a conventional speaker array apparatus having two or more speakers.

  The thin double-sided speaker 100 according to the present embodiment includes two or more power supply terminals 1t corresponding to the vibration areas 15a and 15b, and the wiring patterns 11a and 11b are connected to different power supply terminals 1t, respectively. For this reason, if a drive signal with a different delay time is supplied to each power supply terminal 1t, the directivity direction of the thin double-sided speaker can be controlled. Accordingly, the directivity direction of the thin double-sided speaker can be inclined with respect to the front direction of the sound emitting surface. In addition, the directivity directions of the two sound emitting surfaces can be simultaneously tilted in the same direction. Furthermore, by adjusting the delay time, the angle formed by the front direction and the directivity direction can be adjusted. That is, it can be used in the same manner as a conventional speaker array device.

  Further, in the thin double-sided speaker 100 according to the present embodiment, the fastening means of the casing panel 3 including the bolts 20, the spacers 21, and the nuts 22 regulates the gap width between the permanent magnet plates 2. 2 is bent to prevent the gap at the center from becoming wider than the peripheral edge. For this reason, the gap between the permanent magnet plates 2 can be made uniform, the speaker characteristics can be improved, and variations in quality among products can be suppressed.

  In the present embodiment, an example in which the directing direction is tilted by supplying the same drive signal with different delay times to two or more wiring patterns 11a and 11b has been described. For example, each wiring pattern It is also possible to supply drive signals supplied from different sound source devices to 11a and 11b, respectively, and to output different sounds for the vibration areas 15a and 15b.

Embodiment 2. FIG.
In the first embodiment, the diaphragm 1 is divided into two vibration areas 15a and 15b, and two independent wiring patterns 11a and 11b are formed in association with these vibration areas 15a and 15b. explained. On the other hand, in the present embodiment, the diaphragm 1 ′ is divided into three vibration areas 15a to 15c, and three wiring patterns 11a to 11c independent from each other are formed in association with these vibration areas 15a to 15c. The case where it does is demonstrated.

  FIG. 12 is a diagram showing a configuration example of the main part of the thin double-sided speaker 100 according to the second embodiment of the present invention, and shows a configuration example of the diaphragm 1 ′. The diaphragm 1 ′ is divided into three vibration areas 15a to 15c. Each vibration area 15a-15c includes two or more linear patterns 12. The wiring patterns 11a to 11c are meander patterns obtained by connecting the linear patterns 12 in the corresponding vibration areas 15a to 15c, and are connected to different power supply terminals 1t. Other configurations are the same as those in the first embodiment, and thus a duplicate description is omitted.

  According to this embodiment, diaphragm 1 'can be divided into three or more vibration areas 15a-15c, and each vibration area 15a-15c can be driven independently by a different drive signal. For this reason, a compact composite speaker can be realized as compared with a composite speaker including three speakers each having an independent diaphragm. Further, by dividing the diaphragm 1 ′ into three vibration areas 15 a to 15 c and supplying drive signals having different delay times, it is possible to perform control with a higher degree of freedom with respect to directivity.

  In addition, if the number of vibration areas 15a, 15b,... That divide the diaphragm 1 ′ increases, the area of the diaphragm 1 also increases according to the number of drive areas. As a result, the permanent magnet plate 2 tends to bend, and the variation in the gap between the permanent magnet plates 2 tends to increase. For this reason, when the diaphragm 1 is divided into three or more driving areas, it is particularly preferable to provide a gap regulating means for regulating the gap of the permanent magnet plate 2.

Embodiment 3 FIG.
In the said embodiment, the example in the case of arrange | positioning a gap control means between the drive areas 15a-15c was demonstrated. On the other hand, in the present embodiment, a case will be described in which gap regulating means is provided in the drive area 15b.

  FIG. 13 is a diagram showing a configuration example of the main part of the thin double-sided speaker 100 according to the third embodiment of the present invention, and shows a configuration example of the diaphragm 1. This diaphragm 1 '' is also divided into three vibration areas 15a to 15c, but differs from diaphragm 1 'in FIG. 12 in that three fastening holes 1j are formed in vibration area 5b. That is, the fastening means including the three sets of bolts 20, the spacer 21, and the nut 22 is disposed in the vibration area 5b.

  In general, when the gap width between the permanent magnet plates 2 is out of a predetermined range, the speaker characteristics of the thin double-sided speaker are significantly deteriorated. For this reason, it replaces with the structure which provides a gap control means between the drive areas 15a-15c, the structure which provides a gap control means in the drive area 15b is employ | adopted, and the gap between the permanent magnet plates 2 may be made uniform.

  In this case, if the linear pattern 12 that interferes with the fastening hole 1j is thinned out in the vibration area 15b, a non-vibration area is formed in the vibration area 5b, and the area of each vibration area 15b is substantially narrowed. The problem of deteriorating arises. Therefore, by using the detour straight line pattern 12m having the detour pattern 12n that detours the fastening hole 1j, the non-vibration area is minimized in the vibration area 15b generated by arranging the fastening hole 1j.

  In addition, by expanding the fastening hole 2j of the permanent magnet plate 2 and facing the fastening hole 1j of the diaphragm 1 ″ and the bypass pattern 12n, the bypass pattern 12n faces the permanent magnet plate 2 other than the neutral zone. The point that can be prevented is the same as in the first and second embodiments.

Embodiment 4 FIG.
In the above-described embodiment, the linear pattern 12 extends in parallel with the longitudinal direction of the diaphragm 1, and the opposite sides of the two or more vibration areas 15 a to 15 c, that is, the boundary lines of the vibration areas 15 a to 15 c are the linear pattern 12. The example in the case of being parallel to the above has been described. On the other hand, in the present embodiment, the case where the linear pattern 12 extends in parallel with the short direction of the diaphragm 1 and the boundary line of the vibration areas 15a and 15b intersects the extending direction of the linear pattern 12 will be described. To do.

  FIG. 14 is a diagram showing a configuration example of the main part of the thin double-sided speaker 100 according to the fourth embodiment of the present invention, and shows a configuration example of the diaphragm 1. The diaphragm 1 ′ ″ is divided into two vibration areas 15a and 15b. Compared to the case of diaphragm 1 in FIG. 4 (Embodiment 1), linear pattern 12 is divided at substantially the center, one of which belongs to vibration area 15a and the other belongs to vibration area 15b. .

  The linear pattern 12 is disposed so as to be parallel to the lateral direction of the diaphragm 1 ′ ″, and a multipolar magnetization pattern (not shown) is also disposed so as to be parallel to the lateral direction. And the boundary line of vibration area 15a, 15b is orthogonal to the extending | stretching direction of the linear pattern 12 and the multipolar magnetization pattern which is not shown in figure. In other words, when the diaphragm 1 is divided into two or more vibration areas 15a and 15b, the opposing sides of the two or more vibration areas 15a and 15b are connected to the linear pattern 12 and the landing pattern as described in the first to third embodiments. It can be divided so as to coincide with the extending direction of the magnetic pattern, or can be divided so as to intersect as shown in the present embodiment.

  In addition, although the said embodiment demonstrated the example in the case of forming the meander pattern by connecting the linear pattern 12 which belongs to the same vibration area 15a-15c, this invention is not limited only to such a case. That is, it is only necessary to connect a large number of linear patterns 12 so that currents flow in the opposite directions to the adjacent linear patterns 12, and the present invention is not limited to meandering patterns.

1, 1 ′, 1 ″, 1 ′ ″ Diaphragm 1j Fastening hole 1t Feeding terminal 2 Permanent magnet plate 2h Sound emitting hole 2j Fastening hole 3 Housing panel 3h Sound emitting hole 3t Terminal hole 4 Housing frame 4t Terminal hole DESCRIPTION OF SYMBOLS 10 Resin film 11, 11a-11c Wiring pattern 12 Linear pattern 12m Detour linear pattern 12n Detour pattern 14 Protective film 15a-15c Vibration area 50 Sound source device 51 Delay circuit 100 Thin double-sided speaker bs Buffer sheet et External terminal

Claims (5)

Two permanent magnet plates in which a multipolar magnetization pattern in which strip-shaped N poles and S poles that are parallel to each other alternately appear are formed, and a number of sound emitting holes are formed in a neutral zone between different poles;
A vibration plate disposed between the two permanent magnet plates facing the same pole and having a large number of linear patterns corresponding to the neutral zone;
The diaphragm is divided into two or more vibration areas each composed of two or more adjacent linear patterns,
A thin double-sided speaker, wherein the linear pattern is connected to each vibration area, and two or more wiring patterns capable of supplying the same drive signal with different delay times are formed.   2. The thin double-sided speaker according to claim 1, wherein each of the vibration areas has a rectangular shape and is adjacent to each other with one side facing each other.   The thin double-sided speaker according to claim 2, wherein a gap regulating member that penetrates the diaphragm and regulates a gap between the permanent magnet plates is disposed in the vibration area or between the vibration areas. .   4. The thin double-sided speaker according to claim 3, wherein the linear pattern has a bypass pattern that bypasses the gap regulating member. 5. The thin double-sided speaker according to claim 4, wherein the permanent magnet plate has a through hole facing the bypass pattern.

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