JP2004023431A - Speaker unit with vibration actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a compact and small-aperture speaker unit which outputs broadband sounds (music and voice) from low tones to high tones and realizes an vibration-only output or a synchronous vibration output with music. <P>SOLUTION: The speaker unit is composed of a magnetic circuit composed of a permanent magnet, a yoke and a plate for concentrating the flux of the permanent magnet, a coil disposed in a gap of the magnetic circuit, a diaphragm mounting the coil for exerting a driving force thereto, a vibration actuator having a vibration transferring part for flexibly supporting the magnetic circuit through a suspension composed of flexible springs, and a speaker box. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a small-diameter, small-sized electro-acoustic transducer capable of generating a wide frequency range from low to high frequencies, and also relates to a speaker unit equipped with a vibration actuator capable of simultaneously outputting bodily sensation vibration and music (voice). .
[0002]
[Prior art]
FIG. 3 is a perspective view of a part of a conventional speaker unit that is partially crushed. Conventionally, as shown in FIG. 3, this type of speaker unit has a built-in small speaker (for example, 18 mm or 15 mm in diameter, 3 to 5 mm in height), and thereby has a function of emitting a voice or a ringing tone. I was Further, there is a case in which a vibration source using a DC motor or the like is separately provided in order to have a bodily sensation vibration function.
[0003]
[Problems to be solved by the invention]
In this type of conventional speaker unit, it is necessary to attach individual components in order to generate voice, ringing tone, and vibration, which increases the cost of the components, increases the mounting space, complicates the control circuit, and increases the assembly cost. And so on. Further, since the sound generating parts such as speakers are small in size and small in diameter, the low sound output is small, and a wide band sound (music / voice) cannot be output.
[0004]
SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and provides a speaker unit that can output a wide range of sound (music / voice) from low to high frequency while being small in size and small in diameter, and can realize a vibration independent output or a music and synchronized vibration output. To provide.
[0005]
[Means for Solving the Problems]
The speaker unit of the present invention is arranged in a magnetic circuit including a permanent magnet, a yoke, and a plate used for concentrating a magnetic flux of the permanent magnet, and a gap of the magnetic circuit in order to eliminate the conventional disadvantage. An electroacoustic transducer including a coil, a vibration plate to which the coil is attached, a driving force is given by the coil, and a vibration transmission unit that flexibly supports the magnetic circuit via a suspension made of a flexible spring. A speaker unit comprising a vibration actuator having the same.
[0006]
The present invention also provides a magnetic circuit including a permanent magnet, a yoke, and a plate used for concentrating the magnetic flux of the permanent magnet, a coil disposed in a gap of the magnetic circuit, attaching the coil, A vibration is generated in a vibration actuator having an electro-acoustic transducer including a vibration plate to which a driving force is given by a coil and a vibration transmission unit that flexibly supports the magnetic circuit via a suspension made of a flexible spring. A speaker characterized in that it is possible to simultaneously generate a sound (auditory) and a vibration (body-sensing vibration = tactile sensation) by simultaneously inputting a low-frequency signal and a signal having a frequency higher than the frequency at which the sound is generated. Unit.
[0007]
The present invention also provides a magnetic circuit including a permanent magnet, a yoke, and a plate used for concentrating the magnetic flux of the permanent magnet, a coil disposed in a gap of the magnetic circuit, attaching the coil, A vibration actuator including a vibration plate to which a driving force is applied by a coil and a vibration transmission unit that flexibly supports the magnetic circuit via a suspension made of a flexible spring generates a bodily sensation vibration and a low sound (heavy low sound). The magnetic circuit oscillates due to a wideband input signal ranging from low frequency to high frequency to generate high frequency to produce low frequency sound (heavy low frequency). Both the diaphragm and magnetic circuit vibrate to produce medium frequency, and the diaphragm vibrates to generate high frequency sound. This is a speaker unit provided with a multi-mode vibration actuator characterized by generating.
[0008]
That is, in the vibration actuator of the present invention, the coil in the electric circuit vibrates by applying a broadband signal to the coil, or the magnetic circuit vibrates, or both the coil and the magnetic circuit vibrate, and the vibration actuator passes through the support base. A vibration actuator that transmits vibrations to the outside and transmits as sound output by air vibration due to vibration of a diaphragm is characterized by simultaneous output of vibration and sound. This provides an unprecedented media that enables information transmission (emotions, emotions, etc.) with sound and vibration (hearing, tactile sensation) that are not available in the prior art.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a speaker unit according to an embodiment of the present invention will be described with reference to the drawings.
[0010]
FIG. 1 is an external perspective view of a partially crushed speaker unit according to an embodiment of the present invention. FIG. 2 is a sectional view showing details of a vibration actuator mounted on the speaker unit of FIG.
[0011]
As shown in FIG. 2, the vibration actuator according to the embodiment of the present invention has a magnetic circuit formed of a yoke 31 and a plate 33 so as to sandwich a disk-shaped permanent magnet 32, and has an internal magnetic structure. A central shaft 37 having a shape such as a bolt or a pin penetrates a central hole of the magnetic circuit and is fitted therein, and positions the yoke 31, the permanent magnet 32, and the plate 33 coaxially. The suspension 34 flexibly supports the magnetic circuit with a single arc-shaped helical leaf spring, and is fixed to the outer peripheral portion of the yoke 31 by an elastic material such as an adhesive, an adhesive or a resin, or by caulking, The other end is fixed to the vibration transmitting section 38.
[0012]
On the other hand, the coil 36 is fixed to the vibrating body 35 having the coil fixing portion 39 having a concave shape, is fixed as necessary with an adhesive or the like, and is disposed in the gap of the magnetic circuit.
[0013]
A stopper 40 is provided in the vibration transmitting unit 38, and the stopper 40 has a role of preventing a magnetic circuit from colliding with the vibrating body when excessive power is applied to the vibration actuator.
[0014]
The structure of the magnetic circuit may be either an external magnetic type or a radial type in addition to the internal magnetic type structure shown in FIG. Further, the tip of the yoke 31 of the magnetic circuit is formed in a shape such as a protrusion or an unevenness so that a high magnetic flux density is easily generated even in an internal magnetic type or an external magnetic type. The direction of the magnetic pole of the permanent magnet 32 may be either direction.
[0015]
The suspension 34 is integrated with the vibration transmitting section 38 by insert molding, welding, bonding, or the like.
[0016]
The vibrating body 35 has an arbitrary thickness in a planar shape, a dish shape, a curved shape, a corrugation shape or a combination thereof, and in the case of a curved shape, has a predetermined acoustic characteristic by a single curvature or a combination of different curvatures. I am trying to get it. Further, the outer peripheral portion of the vibrating body 35 is fixed to the vibration transmitting section 38 via an elastic material such as an adhesive, an adhesive, or a resin as necessary in order to obtain a larger amplitude of the vibrating body 35. . A central portion of the central shaft 37 may have a through hole for venting air.
[0017]
The vibration transmitting section 38 is made of a resin or the like that provides an elastic action, and is provided with a sound emitting hole arbitrarily so as to satisfy the principle of the Helmholtz resonator. At this time, there is no inflow / outflow of air other than the sound emitting hole. It is provided as follows.
[0018]
Now, when a signal of a single frequency of about 100 Hz is input to the coil 36, the coil 36 is in the gap of the magnetic circuit, so that the coil 36 and the magnetic circuit are relatively synchronized with the input frequency according to Fleming's left-hand rule. Vibrates, and the vibration is output to the outside via the vibration transmitting unit 38. This is a bodily sensation vibration, and the sound is low sound (heavy low sound).
[0019]
Next, when a single frequency of about 2 kHz is input to the coil 36, the coil 36 and the magnetic circuit vibrate relatively in synchronization with the input frequency, and the vibration of the coil 36 is transmitted to the vibrating body 35 to vibrate the vibrating body 35. However, due to the high frequency, it enters the human audible range and sounds as a sound. At this time, the vibration of the magnetic circuit is also transmitted through the vibration transmitting unit.
[0020]
Further, when a voice (or music) signal of several hundreds to several thousands Hz is input to the coil 36, the vibrator 35 vibrates similarly, but since the diaphragm is a diaphragm film (or cone paper), the vibration actuator As in the case of the speaker, the sound (or music) is output.
[0021]
As described above, since the vibration of the vibration actuator of the present invention has a wide-band frequency characteristic (spectrum), sound (spectrum) output and vibration (spectrum) output can be performed. Compared to the ability to output only sound, it can output a much wider variety of expressions, and simultaneously output sound and vibration. Alternatively, it is also possible to synchronize the vibration resonance fv0, which is composed of the weight of the magnetic circuit of the vibration actuator and the spring constant of the suspension, with the bass sound of the music to add an accent to the music.
[0022]
【The invention's effect】
As described above, according to the present invention, for example, it is possible to provide a speaker unit that can output music, voice, and vibration independently or simultaneously. Furthermore, a speaker unit including a 2-way (3-way) speaker-type electroacoustic transducer capable of outputting from a low frequency (heavy low frequency) to a high frequency with a single device can be provided as a small audio system.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a partially crushed speaker unit according to an embodiment of the present invention.
FIG. 2 is a sectional view of a vibration actuator mounted on the speaker unit of FIG. 1;
FIG. 3 is an external perspective view of a conventional speaker unit, which is partially broken.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sound reproduction apparatus 2 Speaker unit 3 Vibration actuator 21 Speaker 22 Vibration unit 31 Yoke 32 Permanent magnet 33 Plate 34 Suspension 35 Vibration body 36 Coil 37 Center axis 38 Vibration transmission unit 39 Coil fixing unit 40 Stopper 41 Cover A
42 Cover B
43 Sound emission hole for air viscosity attenuation 44 Terminal block 45 Terminal 46 Coil wire

Claims (3)

A magnetic circuit composed of a permanent magnet, a yoke, and a plate used to concentrate the magnetic flux of the permanent magnet, a coil disposed in a gap of the magnetic circuit, the coil is mounted, and a driving force is given by the coil. A speaker unit comprising: a vibration actuator provided with a vibrating plate, a vibration transmitting unit that flexibly supports the magnetic circuit via a suspension made of a flexible spring, and a speaker box. By simultaneously inputting a low-frequency signal for generating vibration and a signal having a frequency higher than the frequency for generating sound, the vibration actuator can simultaneously generate sound (hearing) and vibration (body-sensing vibration = tactile sensation). The speaker unit according to claim 1, wherein the speaker unit is enabled. In the vibration actuator, the magnetic circuit vibrates by a low-band frequency input signal that generates bodily sensation vibration and low sound (heavy bass), and both the diaphragm and the magnetic circuit vibrate by a middle-band frequency input signal. The speaker unit according to claim 1, wherein the speaker unit is a vibration actuator that generates a high temperature by vibrating a diaphragm by an input signal of a high-band frequency.

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