JP5197207B2 - Electroacoustic transducer unit and electroacoustic transducer - Google Patents

Description

  The present invention relates to an electroacoustic conversion unit such as a dynamic speaker unit that drives a diaphragm by a voice coil, and an electroacoustic conversion such as a speaker device or a headphone device that is formed by housing the electroacoustic conversion unit in a housing. More particularly, the invention relates to novel structures that improve their properties.

  Conventionally, in so-called audio systems and audio-visual systems (including television receivers), electroacoustic conversion of high-speed music with a wide dynamic range digitally recorded on a recording medium such as a disc with even better characteristics And it is desirable to reproduce faithfully. Therefore, various devices for improving the characteristics are made to the speaker device (electroacoustic transducer) of the system.

  For example, in a speaker device formed by housing a cone-type speaker unit (electroacoustic conversion unit) in a casing, the opening of the voice coil bobbin of the speaker unit is covered with a flat plate, and distortion (deformation) of the voice coil bobbin due to high-frequency vibrations It has been proposed to improve the characteristics by preventing (see, for example, Patent Document 1).

  Also, in recent years, music distributed as digital data from Internet sites can be imported to mobile phones and personal computers, and the captured music can be enjoyed by outputting audio from the built-in speaker unit or external speaker device. It has been broken. Even in such a case, it is desired to faithfully reproduce music or the like by electroacoustic conversion with even a good characteristic.

By the way, the applicant of the present application has already invented an audio equipment mat in which a plurality of particles of silica gel are arranged in a single layer, and by laying the audio equipment mat under a casing such as a speaker device The vibration characteristics of the housing can be quickly dissipated to improve the acoustic characteristics of the speaker device or the like (see, for example, Patent Document 2).
JP 2008-109587 A (Abstract, paragraphs [0011]-[0013], [0017]-[0020], FIG. 1, etc.) Japanese Patent Laying-Open No. 2005-292767 (abstract, paragraphs [0025]-[0028], [0047], [0065], FIG. 1, etc.)

  As described in Patent Document 1, even if the opening of the voice coil bobbin is covered with a flat plate to prevent distortion (deformation) of the voice coil bobbin due to high-frequency vibrations, vibrations of music and the like that are reproduced and output are electroacoustic conversion units. It is impossible to improve the essential characteristic deterioration of the electroacoustic conversion unit or the electroacoustic conversion device caused by being transmitted through a diaphragm such as a cone.

That is, if explained in examples of corn type speaker unit, the voice coil of the speaker unit is moved back and forth by the electroacoustic transducer of the reproduced signal such as music, cone speaker unit by back-and-forth movement of the voice coil vibrates. Further, it is desirable that the vibration of the cone faithfully reproduces the amplitude change of the audio signal (electrical signal) from the viewpoint of the reproduction characteristics of music or the like, but in reality, (1) it is caused by the audio signal. The cone vibrations gradually spread from the center of the cone in a ring shape toward the periphery, and part of the cone is reflected at the fixed end and returns to the center to act as noise. (2) When the voice coil is moved back and forth by the voice signal, the elastic damper supporting the voice coil vibrates and the cone vibrates. At this time, the damper displaced by the voice signal has its elastic characteristic. Return to the original state (restore) while vibrating. The vibration for restoring the damper occurs regardless of the audio signal, and the vibration for restoration acts as noise on the cone. (3) Excessive noise due to the inertia of the paper or the like is generated in the cone itself. And the characteristic of a speaker unit or a speaker apparatus which accommodated this speaker unit deteriorates by the noise of said (1)-(3), and especially the resolution and resolution of a high sound with a high frequency fall.

  The present invention provides an electroacoustic conversion unit and an electroacoustic conversion device that are caused by vibrations of music to be reproduced transmitted through a diaphragm of an electroacoustic conversion unit with a simple, inexpensive, and revolutionary configuration using silica gel particles. The purpose is to prevent deterioration of characteristics.

  In order to achieve the above-described object, the electroacoustic conversion unit of the present invention includes a diaphragm driven by a voice coil, and a silica gel particle vibration diffuser attached to the diaphragm in a point contact manner. (Claim 1).

  The diaphragm is practically preferable to be a cone type (Claim 2).

  Moreover, it is preferable that the said vibration diffuser is plural, and is attached to one surface of the front side or back side of the said diaphragm (Claim 3). In addition, it is preferable that a plurality of the vibration radiating bodies are attached to both the front and back sides of the diaphragm.

  Next, the vibration diffuser is more preferably formed by coating silica gel particles with carbon (Claim 5).

  Next, the electroacoustic transducer according to the present invention is characterized in that the electroacoustic transducer unit according to any one of claims 1 to 5 is housed in a casing (claim 6). .

  According to the first aspect of the present invention, the vibration-dissipating body of silica gel particles attached in a point contact manner to the diaphragm of the electroacoustic conversion unit has a high vibration transmission speed. Then, when the diaphragm is driven by the vibration of the voice coil based on the electric signal of music or the like to be reproduced and the vibration of the diaphragm spreads from the central portion of the diaphragm toward the periphery, it is attached in the form of a point contact in the middle. Vibrations are quickly dissipated into the atmosphere and disappear through the vibrating body of silica gel particles. Further, the vibration of noise based on the vibration of the damper described above is quickly dissipated through the vibration dissipator into the air (in the atmosphere) and disappears. At this time, since the silica gel is attached to the diaphragm in a point contact manner, the reflection of vibration at the attachment portion does not occur.

  Therefore, electroacoustics originated from vibrations of music to be played, etc. transmitted through the diaphragm of the electroacoustic conversion unit with a simple, inexpensive and groundbreaking configuration that attaches the silica gel particle diffuser to the diaphragm in a point contact manner. It is possible to prevent deterioration of the characteristics of the conversion unit, and to improve the resolution and resolution of a high frequency particularly high frequency sound.

  According to the invention of claim 2, since the diaphragm is of a cone type, the effect of the invention of claim 1 can be achieved when the electroacoustic conversion unit is a practical cone type speaker unit or the like.

  According to the third aspect of the present invention, since a plurality of vibration radiators are attached to one surface of the front or back side of the diaphragm, the vibrations of the diaphragm are more rapidly dissipated into the atmosphere through these vibration radiators. The characteristics of the electroacoustic conversion unit due to the vibration of the vibration of the diaphragm can be prevented more satisfactorily. According to the invention of claim 4, the same effect as that of the invention of claim 3 can be obtained by attaching a plurality of vibration radiators to both the front side and the back side of the diaphragm.

  According to the invention of claim 5, since the vibration transmission speed of the carbon covering the silica gel particles of the vibration radiator is much faster than that of silica gel, the vibration of the diaphragm of the electroacoustic conversion unit is more quickly dissipated into the atmosphere and extinguished. It is possible to prevent the deterioration of the characteristics of the electroacoustic conversion unit due to noise vibration of the diaphragm of the electroacoustic conversion unit.

  According to the sixth aspect of the present invention, the simple and inexpensive and epoch-making configuration of attaching the vibration-dissipating body of silica gel particles to the diaphragm of the electroacoustic conversion unit in a point-contact manner makes it possible to It is possible to provide an electroacoustic transducer such as a speaker device in which the deterioration of the characteristics of the acoustic transducer unit is prevented and the resolution and resolution of a high frequency particularly high frequency are improved.

  Next, in order to describe the present invention in more detail, the embodiment will be described in detail with reference to FIGS.

(First embodiment)
A first embodiment will be described with reference to FIGS.

  1, 2, and 3 are a front view, a rear view, and a bottom view of a speaker unit 1 </ b> A as an electroacoustic conversion unit. FIG. 4 is a perspective view of the speaker unit 1A with the frame removed, and FIGS. 5 and 6 are explanatory views of vibration dissipation of the speaker unit 1A.

  The speaker unit 1A is formed by attaching a vibration diffuser 3a of silica gel particles to the main body 2 of a cone type 8 cm full-range unit (model number FE87E) manufactured by Foster Electric Co., Ltd.

  The main body 2 is configured in the same manner as a general cone-type speaker unit, and generally includes a permanent magnet portion 5 in a metal case 4 having a circular cross section that is open on the front side, and is movable in the front-rear direction at the center. A voice coil 6 is provided.

  A damper 7 corrugated in a concentric manner is provided on the front surface of the metal case 4, and this damper 7 is supported by a base portion of a metal frame 8 protruding forward from the metal case 4 in a parabolic shape. Vibrate.

  Inside the metal frame 8, there is provided a cone-shaped diaphragm (hereinafter referred to as a cone) 9 protruding in a trumpet shape from the center of the damper 7, and the elastic front end edge of the cone 9 is the metal frame 8. Locked to the front opening edge 8a. In addition, the center part of the cone 9 is formed in the cap part 9a which protruded in the mountain shape.

  A fixed terminal plate 10 is attached to the side surface of the metal frame 8. Positive and negative terminals 11p and 11n are attached to the terminal plate 10, and the terminals 11p and 11n are connected to relay fittings 13p and 13n below the diaphragm 9 through the tinsel wire 12, respectively. The ends of the pair of lead wires 14 drawn from the voice coil 6 are attached to the ends 13p and 13n, and the voice coil 6 is connected to the terminals 11p and 11n through the ends 13p and 13n. The lead wire 14 drawn out from the voice coil 6 is bonded to the back surface of the cone 9. Further, the fittings 13p and 13n are resin-coated on the front side and the back side of the cone 9.

  Next, the vibration diffuser 3a will be described.

  The vibration dissipator 3a is made of silica gel particles (preferably inexpensive B-type silica gel particles that have a small atomic weight, are hard, and have a high transmission speed with respect to vibration in order to quickly dissipate the vibration of the cone 9 into the atmosphere.

  The silica gel particles constituting the vibration diffuser 3a are preferably substantially spherical in order to reduce the contact area with the cone 9 as much as possible to suppress the reflection of vibration at that portion. In addition, the particle size, the number of attachments, the attachment position, etc. are determined by listening, etc. In the case of this embodiment, the particle size of the silica gel particles is 2 mm, the number of attachments is 2, and the attachment position is an abbreviation on the front side of the cone 9. A position α1 of an intermediate point between the ends 13p and 13n and a coaxially symmetrical position (preferably a position slightly shifted above or below) α2 shifted by 180 degrees therefrom.

  The vibration diffuser 3a is attached to the positions α1 and α2 on the surface side of the diaphragm 9 in a point contact manner with an adhesive 15 made of synthetic resin. At this time, in order to prevent reflection of vibration by the adhesive 15 and the like, an adhesive that is cured and absorbs less vibration is selected.

  When the vibration diffuser 3a is attached to the cone 9 in a point contact manner, it is generated at the center of the cone 9 (around the cap portion 9a) due to the movement of the voice coil 6 based on audio signals such as music of the terminals 11p and 11n. When the vibration spreads in a ring shape around the periphery of the cone 9 as shown by the arrow line in FIG. 5 and reaches the vibration diffuser 3a at the positions α1 and α2, it is quickly dissipated from the surface through the vibration diffuser 3a and disappears. However, it does not propagate to the outer periphery from the positions α1 and α2 of the cone 9.

  For this reason, (1) the vibration of the cone 9 caused by the audio signal such as music to be reproduced is not reflected by the fixed end of the cone 9 and returned to the central portion. (2) When the damper 7 returns to its original state (restores) while vibrating with the inherent characteristic of elasticity, the recovery vibration generated regardless of the audio signal is quickly dissipated. (3) The noise of excessive incidental sound of the cone 9 itself is quickly dissipated.

  Accordingly, the speaker unit resulting from the vibration of music to be reproduced transmitted through the cone 9 with a simple, inexpensive and epoch-making configuration in which the vibration dissipator 3a of silica gel particles is attached to the cone 9 of the speaker unit 1A in a point contact manner. 1A characteristics are prevented from being deteriorated, and the resolution and resolution of a high frequency particularly high frequency sound are improved.

  In the case of the present embodiment, since the two vibration radiators 3a are attached to the substantially coaxial symmetrical positions α1 and α2 of the cone 9, vibrations at any position of the cone 9 are quickly diffused under substantially the same conditions. There are advantages. Further, since the vibration radiator 3a is attached to the cone 9 in a point contact manner, there is no reflection of vibration at that portion, and further, no vibration is reflected by the adhesive 15, so the vibration radiator 3a is Deterioration of characteristics due to attachment does not occur.

  By the way, the positions α1 and α2 where the vibration dissipator 3a is attached may be coaxially symmetric positions. However, when it is desired to suppress the deterioration of the characteristics due to the vibration as much as possible, the positions α1 and α2 are set so as to be shifted from the coaxial line. It is preferable to do. If the weight balance of the cone 9 is not a problem, the positions α1 and α2 may be any two positions on the coaxial line on the front side of the cone 9 or any two positions not on the coaxial line.

  Further, only one vibration diffuser 3a may be attached at the position α1 or the position α2 on the front side of the cone 6, for example. When one vibration radiator 3a is attached to the position α1, the vibration that spreads in a ring shape around the periphery of the cone 9 and reaches the coaxial line at the position α1 as shown by the arrow line in FIG. It is dissipated from the surface through the diffuser 3a into the air and disappears, and deterioration of the characteristics of the speaker unit 1A is prevented. However, as compared with the case where the two vibration radiators 3a are attached to the positions α1 and α2, it takes some time for the vibration to reach the vibration radiator 3a, and the effect of preventing the deterioration of the characteristics of the speaker unit 1A is low. Become.

(Second Embodiment)
A second embodiment will be described with reference to FIGS.

  The speaker unit 1B of this embodiment is also formed by attaching a silica gel particle vibration diffuser 3a to the main body 2 of a cone type 8 cm full range unit (model number FE87E) manufactured by Foster Electric Co., Ltd. 7 and 8 are a rear view and a perspective view of the speaker unit 1B with the metal frame removed.

  The speaker unit 1B of the present embodiment is different from the speaker unit 1A of the embodiment in that two vibration radiators 3a are fitted on the back side of the cone 9 as shown in FIG. , 13n in the vicinity of positions β1 and β2 are attached in a point contact manner.

  Even when the vibration diffuser 3a is attached to the back side of the cone 9, vibrations generated in the center of the cone 9 and spreading in a ring shape around the periphery reach the vibration diffuser 3a at positions β1 and β2, Through the diffuser 3a, the surface is quickly dissipated into the air and disappears, and the deterioration of the characteristics of the speaker unit 1B due to the vibration of the music to be reproduced transmitted through the cone 9 is prevented. And resolution is improved.

Only one vibration diffuser 3a may be attached to the position β1 or the position α2 on the back side of the cone 9. Then, according to the listening experiments, when mounting only one vibration dissipation member 3a on the back surface of the cone 9, and it was found more preferable this be attached to the position .beta.1.

(Third embodiment)
A third embodiment will be described with reference to FIG. FIG. 9 is a cross-sectional view of the vibration diffuser 3b.

  In the present embodiment, for example, the vibration radiator 3a of the speaker unit 1A of the first embodiment is replaced with a vibration radiator 3b in which silica gel particles 31 are coated with a carbon film 32 and coated with carbon as shown in FIG. This is the point.

  In this case, since the sound speed of carbon is much higher than that of silicon dioxide or the like, the vibration transmission speed in the vibration dissipating body 3b is further increased, and the characteristics of the speaker unit 1 are further improved.

  The thickness of the carbon film 32 of the vibration radiator 3b is preferably as thin as possible from the viewpoint of shortening the transmission distance of vibration as much as possible.

  Of course, the same effect can be obtained even if the vibration radiator 3a of the speaker unit 1B is replaced with the vibration radiator 3b of FIG.

(Fourth embodiment)
Next, a fourth embodiment corresponding to claim 6 will be described with reference to FIG.

  In the case of this embodiment, for example, the speaker unit 1A of the first embodiment is housed in a wooden or synthetic resin casing (speaker box) 16 to form a speaker device 17 that is an electroacoustic transducer of the present invention. Is a point. In this case, since the characteristics of the speaker unit 1A are improved by the vibration radiator 3a, the resolution and resolution of the high-pitched sound having a particularly high frequency are improved.

  The same effect can be obtained when the speaker unit 1B of the second embodiment is housed in a wooden or synthetic resin casing (speaker box) 16 to form the speaker device 17.

(Measurement result)
Next, a description will be given of the result of measuring the reproduction sound of the speaker device 17 formed by housing various speaker units 1x to be measured in the housing 16 by the measurement system of FIG.

  The speaker unit 1x includes a speaker unit 1A (hereinafter referred to as “ww-n unit”) in which two vibration radiators 3a are attached to the surface side of the cone 9 of the main body 2, and both the vibration radiators 3a of the speaker unit 1A. 3b (hereinafter referred to as bb-n unit), speaker unit 1B (hereinafter referred to as n-ww unit) in which two vibration radiators 3a are attached to the back side of cone 9, and both vibrations of speaker unit 1B Either the radiator 3a is replaced with a vibration radiator 3b (hereinafter referred to as an n-bb unit), or the main body 2 is configured without the vibration radiators 3a and 3b (hereinafter referred to as a normal unit). .

  The measurement system of FIG. 11 includes an audio system including an MD player 100, a power amplifier 101, and a speaker device 17 to be measured, and a waveform analysis device 103 having a microcomputer configuration that captures reproduced sound output from the speaker through a microphone 102. .

  Then, the recorded tone burst signal shown in FIG. 12A of 1000 Hz (medium tone) and 5000 Hz (treble) by the MD player 100 (a signal repeated four cycles of an on period of 250 msec and an off period of 750 msec). The reproduced audio signal is output from the speaker device 17 to be measured via the power amplifier 101, and the reproduced sound is taken into the waveform analysis device 103 through the microphone 102, and the output waveform of the speaker device 17 is analyzed by FFT processing. Thus, the measurement results of FIGS. 13 to 17 were obtained.

  FIG. 13 is a measurement waveform diagram when the speaker unit 1x is a ww-n unit, FIG. 14 is a measurement waveform diagram when the speaker unit 1x is a bb-n unit, and FIG. 15 is a case where the speaker unit 1x is an n-ww unit. FIG. 16 is a measurement waveform diagram when the speaker unit 1x is an n-bb unit, and FIG. 17 is a measurement waveform diagram when a normal unit is used for comparison. 13 to 17, the horizontal axis represents time (s), and the vertical axis represents the level (amplitude) expressed in percent full scale.

  Then, in these measured waveform diagrams, as shown in FIG. 12 (b), the signal period of one cycle is divided into a wave of the first large amplitude (level) sound, followed by b wave of the true amplitude. Further, when the speaker unit 1x is a www-n unit, a bb-n unit, an n-ww unit, or an n-bb unit, the vibration is dissipated when the speaker unit 1x is divided into c-waves of a vibration portion (noise portion) due to inertia following it. By attaching the bodies 3a and 3b, it was confirmed that the c-wave portion was reduced and shortened compared with the case where the speaker unit 1x was a normal unit, and the resolution and resolution of high frequencies with high frequencies were improved.

Thus, ww-n unit, bb-n unit, n-ww unit, n-bb units of the speaker unit and, in the speaker apparatus 17, which is formed by using these units, the vibration dissipation body 3a cone 9, 3b By attaching, the resolution and resolution of high frequencies with high frequencies are improved.

  The present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the spirit of the present invention.

  For example, what is necessary is just to set the magnitude | size (particle size) and the number of vibration diffusers 3a, 3b attached to the front side and the back side of the cone 9 and the number of attachment positions based on audition. And the effect similar to said each embodiment is show | played by attaching the 1 or several vibration-radiating body 3a, 3b of a suitable magnitude | size to the front side or back side of the cone 9. FIG. In this case, the plurality of vibration radiators may have a configuration in which the vibration radiators 3a and 3b are mixed. Further, even if one or a plurality of vibration radiators 3a and 3b having an appropriate size are attached to both the front side and the back side of the cone 9, the same effect can be obtained. At that time, the vibration radiators attached on the front side and the back side of the cone 9 may be different from the vibration radiators 3a and 3b, and a plurality of vibration radiators on both sides are mixed with the vibration radiators 3a and 3b. There may be.

  Next, the present invention can be applied not only to a cone-type full-range unit but also to a 2-way or 3-way unit, a low-frequency woofer, a high-frequency tweeter, and a speaker device in which they are housed in a casing. Of course. Further, the present invention can be similarly applied to various horn-type and dome-type speaker units and speaker devices in which those units are housed in a casing. Furthermore, the present invention can also be applied to a headphone unit, an open air type headphone device in which the headphone unit is housed in a housing, and the like.

  The electroacoustic conversion unit and the electroacoustic conversion device of the present invention may be speaker units or headphone units, speaker devices or headphone devices of various audio systems or audio / visual systems, and further, mobile phones, transceivers, etc. May be a handset or a speaker unit.

It is a front view of the speaker unit of 1st Embodiment. It is a rear view of the speaker unit of FIG. It is a bottom view of the speaker unit of FIG. It is a perspective view of the state which removed the frame of the speaker unit of FIG. It is explanatory drawing of the dispersion | distribution of the vibration of the speaker unit of FIG. It is explanatory drawing of the other example of the radiation of the vibration of the speaker unit of FIG. It is a rear view of the state which removed the frame of the speaker unit of 2nd Embodiment. It is a perspective view of the speaker unit of FIG. It is sectional drawing of the vibration dissipation body of 3rd Embodiment. It is a front view of the speaker apparatus of 4th Embodiment. It is explanatory drawing of a measurement system. It is explanatory drawing of measurement conditions, (a) is a wave form diagram of the ton burst signal output by audio | voice, (b) is explanatory drawing of evaluation of a measurement result. It is a 1st waveform diagram of a measurement result. It is a 2nd waveform figure of a measurement result. It is a 3rd waveform figure of a measurement result. It is a 4th waveform figure of a measurement result. It is a 5th waveform figure of a measurement result.

Explanation of symbols

1A, 1B Speaker unit 3a, 3b Vibration diffuser 6 Voice coil 9 Cone 17 Speaker device

Claims (6)

  An electroacoustic conversion unit comprising: a diaphragm driven by a voice coil; and a silica gel particle diffuser attached to the diaphragm in a point contact manner. In the electroacoustic conversion unit according to claim 1,
The electroacoustic conversion unit, wherein the diaphragm is a cone type. The electroacoustic conversion unit according to claim 1 or 2,
The electroacoustic conversion unit, wherein a plurality of the vibration radiating bodies are attached to one surface of the front or back side of the diaphragm. The electroacoustic conversion unit according to claim 1 or 2,
The electroacoustic conversion unit is characterized in that there are a plurality of the vibration radiating bodies and are attached to both the front side and the back side of the diaphragm. In the electroacoustic conversion unit according to any one of claims 1 to 4,
The electroacoustic conversion unit, wherein the vibration diffuser is formed by coating silica gel particles with carbon.   An electroacoustic transducer formed by housing the electroacoustic transducer unit according to claim 1 in a housing.

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