JP2006060625A - Stacked compound acoustic system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stacked compound acoustic system which maintains sound image localization satisfactorily even though acoustic systems with various different opening dimensions are combined with each other and has high flatness of a sound pressure frequency characteristic to provide high sound quality. <P>SOLUTION: In this stacked compound acoustic system which has a plurality of acoustic systems with different central values of reproduction frequency areas and in which the plurality of acoustic systems are stacked and mounted in a housing so as to make sound wave radiation directions to be the same direction, the respective acoustic systems are arranged separately from one another across a space area, and the housing has a sound emitting hole for radiating sound waves outputted from the acoustic system arranged at a post stage via the space area with respect to the sound wave radiation directions. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a laminated composite acoustic device in which a plurality of acoustic devices having different center values in a reproduction frequency region are combined. More specifically, the present invention aims to improve reproduction frequency characteristics and sound image localization, and the sound wave emission direction is The present invention relates to a multilayer composite acoustic device in which a plurality of acoustic devices are stacked in the same direction and placed in a casing.

  In recent years, with the remarkable improvement of acoustic technology, demands for the performance and quality of sound reproduction apparatuses have been increasing. Under such a background, in a laminated composite acoustic device in which a plurality of acoustic devices are stacked and combined, the importance thereof is increasing due to good acoustic characteristics and sound image localization.

Hereinafter, a conventional multilayer composite acoustic device (see, for example, Patent Document 1) will be described with reference to FIG.
As shown in FIG. 3, the multilayer composite acoustic device 32 is configured such that a large-diameter acoustic device 24 having a low-frequency reproduction frequency and a small-diameter acoustic device 25 having a high-frequency reproduction frequency are stacked on the same axis. Is arranged in. Here, each of the acoustic devices 24 and 25 includes a magnetic circuit unit including magnets 1e and 1f, movable coils 2e and 2f, internal yokes 3e and 3f, external yokes 4e and 4f, diaphragms 5e and 5f, and suspension ends. It consists of parts 6e and 6f and outer frames 7e and 7f.

  When an electroacoustic signal is applied to the laminated composite acoustic device 32, the acoustic devices 24 and 25 are simultaneously driven according to the applied signal, and a sound field vibration is induced, thereby obtaining an acoustic effect. In the multilayer composite acoustic device 32, since the two acoustic devices 24 and 25 are laminated on the same axis, sound waves generated from the acoustic devices 24 and 25 are radiated in the same direction, and a low-frequency range and a high-frequency range are obtained. Sound sources in the range are recognized as the same location. Therefore, the multilayer composite acoustic device 32 has an advantage that a good sound image localization can be realized.

Japanese Examined Patent Publication No. 59-12237 (page 3, Fig. 1)

  However, in the conventional laminated composite acoustic device 32 described above, the radiated sound wave from the acoustic device 24 located in the rear part in the sound wave radiation direction is not disturbed as much as possible by the acoustic device 25 located in the front part. It must be designed in consideration of the arrangement form of the members constituting each acoustic device, particularly the diaphragm 5e.

  Therefore, it is necessary to increase the aperture ratio of the diaphragm 5e of the acoustic device 24 with respect to the acoustic device 25 in the multilayer composite acoustic device 32. Usually, since the diaphragm of the acoustic device has a size substantially equal to the aperture of the acoustic device itself, this also requires that the aperture ratio of the acoustic device 24 itself to the acoustic device 25 be increased.

  Therefore, in this conventional multilayer composite acoustic device 32, as described above, only a combination of acoustic devices having a limited size ratio, that is, the small-diameter acoustic device 25 and the large-diameter acoustic device 24 can be realized. Combinations such as a medium-diameter acoustic device and a large-diameter acoustic device having a close ratio, or a small-diameter acoustic device and a medium-diameter acoustic device are difficult to realize.

  In order to achieve the above object, the acoustic device of the present invention employs the following configuration.

  The multilayer composite acoustic device according to the present invention includes a plurality of acoustic devices having different center values in the reproduction frequency region, and the plurality of acoustic devices are stacked and mounted on the casing so that the sound wave emission directions are the same. In the stacked composite acoustic device, the acoustic devices are arranged so as to be separated from each other through a spatial region, and the sound waves output from the acoustic device disposed in the subsequent stage with respect to the sound wave radiation direction are transmitted. It is characterized by having a sound emitting hole for radiating through a space region.

  In the multilayer composite acoustic device according to the present invention, the above-described spatial region is substantially sealed with a housing provided with a sound emission hole, and the resonance frequency of the spatial region is disposed in the rear part thereof. It is characterized in that it is substantially equal to the center value of the reproduction frequency region of the apparatus.

  Furthermore, the multilayer composite acoustic device according to the present invention is characterized in that the central value of the reproduction frequency region of the acoustic device disposed in the preceding stage is smaller than the acoustic device disposed in the subsequent stage with respect to the sound wave radiation direction. To do.

  Furthermore, the multilayer composite acoustic device according to the present invention is characterized in that a plurality of acoustic devices in the front row in the direction of sound wave radiation are provided, and the plurality of acoustic devices are arranged in parallel.

  Still further, in the multilayer composite acoustic device according to the present invention, a plurality of acoustic devices arranged in the front row portion are radiated from an acoustic device in which the sound wave emission central axes of the plurality of acoustic devices are arranged in the subsequent stage. It is characterized by being arranged so as to converge toward the central axis.

  In the multilayer composite acoustic device according to the present invention, the acoustic devices are arranged so as to be spaced apart from each other via a spatial region, and the spatial region is substantially sealed except for the sound emission holes that emit sound waves from the subsequent acoustic device. In addition, since the resonance frequency of this spatial region has a value approximately equal to the resonance frequency of the subsequent acoustic device, the acoustic wave from the subsequent acoustic device can be obtained regardless of the aperture size of the acoustic device arranged in the front row. The advantage is that the effect can be maintained as it is.

  For this reason, various combinations of a plurality of acoustic devices with different caliber sizes can be made with a single laminated composite acoustic device, and particularly in a combination of acoustic devices with close aperture ratios, the reproduction frequency bands overlap. The flatness of the sound pressure frequency characteristics is improved, and good acoustic characteristics can be realized.

FIG. 1 shows a configuration example of a multilayer composite acoustic device.
The multilayer composite acoustic device 30 of the present invention has a plurality of acoustic devices 20 and 21 having different center values in the reproduction frequency region, and the plurality of acoustic devices 20 and 21 are arranged so that the sound wave emission directions are the same direction. The acoustic devices are stacked and placed in the housing 11, and the acoustic devices are arranged apart from each other via the space region 8, and the housing 11 is arranged in the subsequent stage with respect to the sound wave emission direction. The sound emitting holes 9 and 10 for radiating the sound wave output from 20 through the space region 8 are configured. The spatial region 8 is configured to have a resonance frequency substantially equal to the center value of the reproduction frequency region of the acoustic device 20.

  By adopting the configuration as described above, while maintaining the sound image localization well, the acoustic devices 20 and 21 having various caliber sizes are combined in various combinations, thereby further improving the flatness of the sound pressure frequency characteristics. Thus, it becomes possible to provide the laminated composite acoustic device 30. The specific configuration and operation will be described with reference to the drawings. The same reference numerals as those in the background art are used for the same members as those in the conventional configuration in the configuration of the present invention.

First, a configuration example of the multilayer composite acoustic device 30 in the first embodiment of the present invention will be described.
As shown in FIG. 1, the multilayer composite acoustic device 30 includes a magnetic circuit unit having a magnet 1a, a movable coil 2a, an internal yoke 3a, an external yoke 4a, and the like, a diaphragm 5a, a suspension end 6a, and an outer frame 7a. The configuration in which the configured large-diameter electromagnetic acoustic device 20 and the electromagnetic acoustic device 21 having the same configuration are stacked so that the sound wave radiation direction is the same direction is the same as the conventional configuration, The acoustic devices 20 and 21 are different from the conventional configuration in that the acoustic devices 20 and 21 are arranged to be separated from each other via a predetermined space region 8.

  Furthermore, the space region 8 is in a substantially sealed state surrounded by a casing 11 provided with minute sound emission holes 9 and 10, and the space volume and the space shape are the acoustics arranged at the rear part thereof. It is designed to have a resonance frequency substantially equal to the center value of the reproduction frequency region of the device 20.

Next, functions and operations of the multilayer composite acoustic device 30 according to the present invention will be described.
When an electroacoustic signal is applied to the multilayer composite acoustic device 30, the acoustic devices 20 and 21 are simultaneously driven according to the applied signal to induce a sound field vibration, as described in the background art. Thus, an acoustic effect can be obtained. In the multilayer composite acoustic device 30, the spatial region 8 functions as a resonance space for the acoustic device 20 by the configuration as described above.

  Since the spatial region 8 has a function as a resonance space for the acoustic device 20, the sound field vibration of the acoustic device 20 induced by the application of the electroacoustic signal is accompanied by a resonance effect in the process through the spatial region 8. It becomes possible to receive an amplification action. Therefore, as shown in FIG. 1, even if the structure is such that a sound shield is interposed in front of the acoustic device 20 to prevent the sound wave from being emitted, the sound field vibration amplified in the space region 8 is From the minute sound emission holes 9 and 10, the sound is emitted as a high sound pressure sound, and a sufficient effect as an acoustic device can be exhibited.

  In addition, the sound of the acoustic device 20 radiated from the sound emission holes 9 and 10 through the space region 8 is compared with the case where the sound is radiated without passing through the resonance space due to the flattening of the sound pressure frequency characteristic due to the resonance effect. As a result, better acoustic characteristics can be realized. In particular, since this tendency appears remarkably in the low sound region, a higher resonance effect is obtained when the sound device 20 arranged in the rear part is enlarged and the sound device in which the center value of the reproduction frequency region is lowered is adopted. The effect of the present invention becomes remarkable.

  Furthermore, since the space region 8 serving as the resonance space can sufficiently exhibit the resonance effect even when the sealing degree is high, the sound emission holes 9 and 10 provided in the housing 11 are the minimum size necessary for sound wave radiation. For example, the sound emitting hole 9 provided in parallel with the acoustic device 21 also functions sufficiently fine. Therefore, even if the diameter of the acoustic device 21 arranged in the front row is set to a diameter close to that of the acoustic device 20 arranged in the subsequent stage, the acoustic effect from the acoustic device 20 is not impaired as in the conventional configuration. .

  Therefore, according to the multilayer composite acoustic device 30 of the present invention, it is possible not only to combine acoustic devices having a large caliber ratio (that is, having a diameter far from each other) as in the conventional configuration, but also calibrate each other. It is possible to combine the acoustic devices 20 and 21 having a small ratio (that is, having diameters close to each other).

In other words, in the conventional configuration, the combination form of the acoustic devices is limited, such as the small-diameter acoustic device 25 and the large-diameter acoustic device 24 having a large mutual aperture ratio, but the laminated composite acoustic of the present invention. In the device 30, not only the above combination, but also an acoustic device having different caliber sizes such as a medium-diameter acoustic device and a large-diameter acoustic device or a small-diameter acoustic device and a medium-diameter acoustic device may be arbitrarily combined. I can do it.

  In general, the larger the apertures of the diaphragms 5a and 5b of the acoustic devices 20 and 21 in the multilayer composite acoustic device, the smaller the center value of the reproduction frequency region of the acoustic devices 20 and 21, and thus the necessity. If the diaphragm 5 is configured with two acoustic devices having a small aperture ratio, the center values of the reproduction frequency regions of the respective acoustic devices are close to each other.

  Therefore, as described above, when the acoustic devices 20 and 21 having a small aperture ratio are combined, when the electroacoustic signal is applied to the laminated composite acoustic device 30, the acoustic devices 20 and 21 are radiated. This makes it easy to overlap the reproduction frequency bands, and the effect of compensating each other's sound pressure over a wide range is obtained. As a result, the flatness of the sound pressure frequency characteristics can be improved, and a remarkable effect that has not been achieved in the past can be obtained.

  In addition, although the structural example using the two electromagnetic type acoustic devices 20 and 21 was shown here, as an acoustic device having a driving principle other than the electromagnetic type, for example, a piezoelectric type or electrostatic type acoustic device is mixed. It may be configured as a laminated composite acoustic device. Also, as a matter of course, it is possible to use a multi-layer composite acoustic device composed of three or more layers using three or more acoustic devices. And in the case of a multilayer composite acoustic device using three or more acoustic devices having different center values in the reproduction frequency region in this way, it is possible to improve the flatness of the sound pressure frequency characteristics in a wider frequency region. Become.

  Furthermore, in FIG. 1, although the example of the laminated composite acoustic device in which the aperture of the front row acoustic device is smaller than the aperture of the subsequent acoustic device is shown, even if the size of the aperture is reversed, The effect by this invention is achieved.

  FIG. 2 is a cross-sectional view showing a second embodiment according to the present invention. In place of the configuration of the first embodiment in which one acoustic device is arranged in the front row in the sound wave emission direction, 2 shows a configuration example of a laminated composite acoustic device 31 having a configuration in which two acoustic devices 22 having a small diameter and an acoustic device 23 having a medium diameter are arranged in parallel.

  In the laminated composite acoustic device 31, the radiation center axes 12 and 13 indicating the sound image localization directions of the acoustic devices 22 and 23 are converged toward the radiation center axis 14 of the acoustic device 20 disposed in the subsequent stage. The acoustic devices 22 and 23 are arranged in an inclined manner. In the drawing, the acoustic device 23 has the same configuration as that of the acoustic device 20 except that the diameter of the diaphragm 5 is smaller than that of the acoustic device 20 disposed in the subsequent stage. In this example, the piezoelectric acoustic device includes an elastic plate 16, an elastic adhesive 17, a vibration plate 5d, a suspension end 6d, and the like.

  As described above, the two acoustic devices 22 and 23 are arranged substantially in parallel in the front row, and the respective radiation center axes 12 and 13 are converged toward the radiation center axis 14 of the rear acoustic device 20. By adopting the inclined form, the sound wave radiated from the sound devices 22 and 23 when the laminated composite sound device 31 is driven is overlapped with the sound wave of the sound device 20 radiated through the sound emitting hole. Will be focused.

As a result, a sound field region in which the sound waves of the three acoustic devices 20, 22, and 23 overlap is formed in the upward direction of the radiation center axis 14 of the acoustic device 20 in the drawing, that is, on the front axis of the multilayer composite acoustic device 31. Is done. In this region, the different reproduction frequency regions in each acoustic device overlap each other so as to complement each other, so that the sound pressure frequency characteristics can be flattened over a wider frequency region, and the sound quality can be improved. .

  In addition, the acoustic device 20 and the acoustic devices 22 and 23 are stacked in two stages, although not as much as the laminated composite acoustic device having a three-layer structure in which all the three acoustic devices 20, 22, and 23 are laminated. The sound image localization close to that can be maintained depending on the configuration.

  Furthermore, compared with a three-layer configuration in which all three acoustic devices 20, 22, and 23 are laminated, since it has a two-layer configuration, not only the device can be made thinner, but also the device structure can be simplified, It is also effective in simplifying the manufacturing process.

1 is a cross-sectional view of a multilayer composite acoustic device according to the present invention. (Example 1) 1 is a cross-sectional view of a multilayer composite acoustic device according to the present invention. (Example 2) It is sectional drawing of the laminated | stacked composite acoustic apparatus in background art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnet 2 Movable coil 3 Inner yoke 4 Outer yoke 5 Diaphragm 6 Suspension end 7 Outer frame 8 Spatial region 9, 10 Sound emitting hole 11 Housing | casing 12-14 Radiation center axis 15 Piezoelectric material 16 Elastic plate 17 Elastic adhesive 18 Sound vent

Claims (5)

In a multilayer composite acoustic device having a plurality of acoustic devices having different center values in a reproduction frequency region, the plurality of acoustic devices being stacked and mounted in a casing so that the sound wave emission directions are the same direction ,
The acoustic devices are arranged apart from each other through a spatial region,
The housing has a sound emitting hole for radiating a sound wave output from the acoustic device disposed at a later stage through the space region with respect to the sound wave radiation direction. apparatus.   The spatial region is substantially sealed in the housing provided with the sound emission holes, and the resonance frequency of the spatial region is substantially equal to the center value of the reproduction frequency region of the acoustic device disposed at the rear portion thereof. The multilayer composite acoustic device according to claim 1, wherein the laminated composite acoustic device is configured as follows.   3. The center value of the reproduction frequency region of the acoustic device arranged in the preceding stage is smaller than the acoustic device arranged in the subsequent stage with respect to the sound wave emission direction. Multilayer composite acoustic device.   The stacked composite acoustic device according to any one of claims 1 to 3, wherein the acoustic device in the front row in the sound wave emission direction is formed by arranging a plurality of acoustic devices in parallel.   The plurality of acoustic devices arranged in the foremost row are arranged such that the sound wave radiation central axes of the plurality of acoustic devices converge toward the radiation central axis of the acoustic device disposed in the subsequent stage. The multilayer composite acoustic device according to claim 4, wherein the multilayer composite acoustic device is formed.

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