JPH11234772A - Speaker system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker system that has an excellent directivity and an excellent frequency response characteristic over a wide sound frequency range from a low sound frequency to a high sound frequency and sounds a reproduced output with a clear sound image localization. SOLUTION: A sounding face 2a of a 1st diaphragm 2 is in contact with a bottom 10a of a yoke 10 in the driver unit 2 while a mount hole 2a made to the 1st diaphragm 2 is communicated with a mount hole 10c of the bottom 10a. The yoke 10 of the driver unit 3 is tightly fitted to the sound face 2a of the 1st diaphragm 2 by screwing screws 15a, 15b from a rear side 2b to the hole 2e up to the hole 10c respectively. A low sound frequency reproduced output is sounded by driving the 1st diaphragm 2 formed as a panel made of a material that is hard and has a high mechanical strength characteristic with a reaction force of the driver unit 3 vibrated based on the reproduced input signal. A voice coil 6 of the driver unit 3 directly drives a 2nd diaphragm 5 to sound a high frequency reproduced output similarly to a conventional speaker.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker device, and more particularly, to a speaker device having a sound emitting section for emitting a low-range reproduction output and a sound emitting section for emitting a high-range reproduction output. .

[0002]

2. Description of the Related Art A speaker device for emitting a reproduced output is connected to an audio device or a video device. Generally speaking, in order to emit sound output with good frequency response characteristics and sound quality at a sufficient volume in a wide frequency band from the low frequency range to the high frequency range, the speaker device generally combines multiple types of speaker devices adapted to the reproduction frequency band. As a combined speaker device. As a composite speaker device for general users, for example, a two-way type in which a reproduction frequency band is divided into a low range and a high range, or a three-way type in which a reproduction range is divided into a low range, a middle range, and a high range is provided. . The composite speaker device is configured such that individual speaker devices conforming to the above-described specifications are incorporated in the enclosure.

[0003] For example, a two-way loudspeaker device is composed of a large-diameter woofer having good reproduction characteristics in a low-frequency range and a small-diameter tweeter having good reproduction characteristics in a high-frequency range. In the two-way speaker device, a large-diameter woofer is used in order to further improve the reproduction characteristics in the low-frequency range, so that a large-sized enclosure or baffle plate having a large internal capacity is required, and the size and the weight are increased. The enclosure is formed as a basic shape of a rectangular parallelepiped, though there are some changes due to chamfering or the like.

On the other hand, audio equipment, video equipment, and the like constituting the main equipment have been reduced in size and weight, or differentiated in design, in conjunction with personal use. Therefore, the speaker device, which is a connected device,
The above-described configuration occupies an extremely large occupied space in a limited indoor space, and is difficult to harmonize with the main device, making it difficult to obtain discrimination. Also,
Since the speaker device is large and heavy, the degree of freedom of the installation position in the room is small, and the speaker device is not always installed at a position where the acoustic characteristics are optimized. Once installed, the speaker device is fixed as it is, and is rarely moved freely to a desired position.

[0005]

In view of the above circumstances, there is a strong demand for a speaker device that is smaller, thinner and lighter, and there is also a great need for a slender shape that matches the appearance of the main unit. However, the speaker device is
Due to its characteristics, it is difficult to obtain good reproduction characteristics in a low frequency range with some small-diameter units, so that such a requirement has not been realized.

Many attempts have been made to realize a so-called panel type speaker device which is thin and does not require an enclosure or the like and can be installed at any position. Most of these attempts have been based on the cone type dynamic speaker or horn type dynamic speaker described above. However, none of these attempts has led to the realization of an ideal panel-type speaker device due to technical limitations, acoustic performance limitations, and the like.

In a speaker device, it is generally considered that when a reproduction input signal is supplied, a diaphragm is operated like a piston by a driver unit to emit sound of a reproduction output. Therefore, in a panel type speaker device, an attempt has been made to produce a high-precision planar diaphragm that operates in the same manner as the diaphragm of the above-described conventional speaker device by using an electromagnetic drive method or an electrostatic drive method for the diaphragm.
For example, in an electrostatic drive type diaphragm, an outer peripheral portion is supported with a predetermined tension, and when a driving force is applied from a driver unit, waves are continuously generated concentrically from the driving position. . Such diaphragms have to solve various problems caused by large area piston operation which, by operating as a large single phase diaphragm, cause sound concentration and uncontrollable vibration.

On the other hand, as a panel type speaker device, a speaker device having a novel panel structure in which a diaphragm is driven by a driver unit based on a bending wave theory has been proposed. In this novel panel type speaker device, the diaphragm is formed by a rigid panel structure having relatively large mechanical rigidity, and when a driving force is applied from a driver unit, a complex vibration mode is generated on the entire surface of the diaphragm. Is done. The vibration mode has the most complex and dense waveform structure uniformly distributed in the operating frequency range of the flat panel (diaphragm). The novel panel type loudspeaker device is characterized by the analysis of the physical characteristics of bending waves, the speed versus frequency characteristics of the waves, and the driving point impedance characteristics for a finite size diaphragm.

A novel panel-type speaker device uses a diaphragm having a flexural rigidity whose parameters are optimized according to the intended use. In general, a new panel-type speaker device is driven by a driver unit near a center point of the diaphragm in order to secure a bending mode with the maximum density from the diaphragm. The diaphragm has been proven by mathematical modeling tools to a specific aspect ratio that provides uniform modal density by finite element analysis. For the diaphragm, the supply position of the driving force for achieving the best mode uniformity is determined by Fourier-type analysis. Then, in the diaphragm, although some loss occurs in a high frequency band due to extension of the Fourier analysis, it is possible to drive a diaphragm having a larger area. The diaphragm is represented by a bending stiffness equation that approximates the more general static beam bending equation by taking the zero frequency limit of the wave function.

[0010] The novel panel type speaker device has factors that determine the bending operation of the diaphragm, namely, surface density, bending rigidity, and the like.
It is manufactured by optimally setting parameters of geometric dimensions (outer dimensions), surface area, positions of driving points, parameters of a drive unit, a shear module of a core, internal loss, or a method of supporting a diaphragm. In a general speaker device, since a rear sound called a dipole has a phase opposite to that of a front sound, a large baffle plate or an enclosure for preventing cancellation of acoustic energy in a middle frequency band to a low frequency band is required. I do. On the other hand, in the new panel-type speaker device, since the radiation of the rear sound called bipolar is added to the front sound,
The acoustic efficiency is improved, and large and heavy baffle plates and enclosures are not required.

The novel panel type speaker device enables full range output reproduction with one diaphragm driven by a single element transducer. The new panel type speaker device can obtain a flat frequency characteristic equivalent to that of the conventional speaker device by selecting an appropriate material for the diaphragm and a configuration suitable for the transducer.

The new panel type speaker device not only achieves compatibility with existing amplifiers by making the sensitivity and electric load equal to those of the conventional speaker device,
A dynamic driver unit or a piezoelectric driver unit generally used for these can be applied, and a radiation pattern of an extremely wide sound field and a bidirectional radiation pattern can be obtained. The new panel type speaker device has a characteristic of omnidirectional radiation independent of an input frequency with a conversion efficiency from mechanical energy to acoustic energy of almost 100%, that is, a large uniformity of sound power for each input frequency. I have. The novel panel-type speaker device has such a feature that sound power attenuation due to distance conditions is small, and has various other features due to its novel configuration.

On the other hand, the new panel-type speaker device has various features as described above, but it is difficult to obtain a clear sound image localization because an independent vibration mode occurs on the entire surface of the diaphragm in the high-frequency range. It has such characteristics.

Accordingly, the present invention follows the features of the novel panel-type speaker device described above, and is configured to be small, thin, and lightweight, and has excellent frequency response characteristics and directivity in a wide range from a low range to a high range. It has been proposed for the purpose of providing a speaker device which emits a reproduced output having a clear sound image localization.

[0015]

According to the present invention, there is provided a speaker device which is formed in a panel shape with a high rigidity and a high mechanical strength, and is provided in an unconstrained state so that an outer peripheral portion freely vibrates in a thickness direction. , A first diaphragm supported by the above, a voice coil unit, and a magnetic circuit unit for vibrating the voice coil unit based on a reproduction input signal, at least one of which is fixed via a component of the magnetic circuit unit And a second diaphragm that is directly vibrated by the vibration operation of the voice coil unit of the driver unit.

According to the loudspeaker device of the present invention having the above-described structure, the reaction force of the voice coil unit of the driver unit vibrating based on the reproduction input signal is applied to the magnetic circuit unit via the constituent members. The first diaphragm is driven, and partial vibration occurs on the entire surface of the first diaphragm to emit a low-range reproduction output. The speaker device directly drives the second diaphragm by the vibrating operation of the voice coil unit to emit a high-frequency reproduction output. Therefore, since the speaker device includes the low-range sound emitting unit and the high-range sound emitting unit, the speaker device has good frequency response characteristics and directional characteristics in a wide range from the low range to the high range, and has a clear sound image localization. The playback output is emitted with a feeling.

Since the speaker device is small, thin and light by eliminating the need for a large-diameter speaker for the low frequency range, the speaker device can have a desired position or acoustic characteristics without occupying a large space in a limited room. It is easily arranged at the optimum position. In the speaker device, the first diaphragm is formed of a hard panel material having high mechanical strength.
Even when an impact or the like is applied from the outside, breakage or deformation is suppressed, and reliability is maintained. Since the driver unit is attached to the speaker device via a magnetic circuit component having a large strength that can easily achieve impedance matching with the first diaphragm, this first unit is used.
Is efficiently driven.

Further, the speaker device according to the present invention for achieving the above-mentioned object comprises a baffle plate, a loudspeaker for a high frequency range attached to the baffle plate, a voice coil unit, and the voice coil unit based on a reproduction input signal. And a driver unit fixed to a baffle plate via a constituent member of the magnetic circuit unit.

According to the speaker device of the present invention configured as described above, the reaction force of the voice coil portion of the driver unit vibrating based on the reproduction input signal is applied to the magnetic circuit portion via the constituent members. The baffle plate is vibrated, and a reproduced output in a low frequency range is emitted using the baffle plate as a diaphragm. Further, in the speaker device, a reproduction output in a high frequency range is emitted by a high frequency range speaker. Therefore, since the speaker device includes the low-frequency sound emitting section using the baffle plate as the diaphragm and the high-frequency speaker, it has good frequency response characteristics and directional characteristics in a wide range from the low frequency range to the high frequency range. Then, the reproduced output is emitted with a clear sound image localization feeling.

The speaker device is small, thin, and lightweight by eliminating the need for a large-diameter speaker for the low-frequency range. Therefore, the speaker device has a desired position or acoustic characteristics without occupying a large space in a limited room. Is easily arranged at a position or the like that optimizes Since the large baffle plate is hard and has high mechanical strength, the speaker device is prevented from being damaged or deformed even when an impact or the like is applied from the outside, thereby maintaining reliability. In the speaker device, the driver unit is mounted via a magnetic circuit component having a large strength that facilitates impedance matching with the baffle plate, so that the baffle plate is efficiently driven.

[0021]

Embodiments of the present invention will be described below in detail with reference to the drawings. The speaker device 1 shown in FIGS. 1 and 2 as a first embodiment of the present invention
As will be described later, a baffle plate 2 (hereinafter, referred to as a first diaphragm 2) having one main surface 2a as a sound emitting surface and acting as a diaphragm, and a sound emitting surface of the first diaphragm 2 One dynamic driver unit 3 (hereinafter simply referred to as the driver unit 3) is mounted at a position substantially at the center of 2a. The first diaphragm 2 is entirely formed in a rectangular panel shape, and one end side thereof is fixed to the stand member 4 to form a fixed portion 2d. The outer peripheral portion 2c of the first diaphragm 2 other than the fixed portion 2d with the stand member 4 is in an unconstrained state, and is configured to freely vibrate by the driver unit 3 as described later.

The first diaphragm 2 is formed by using a baffle plate formed of a hard and high mechanical strength panel material used in a conventional speaker device or an engineering plastic such as styrene resin.
That is, unlike the diaphragm of the conventional speaker device, the first diaphragm 2 is formed of a panel material that is hard and has high mechanical strength as described above. Therefore, the first
The vibration plate 2 is used in a state where it is exposed on the surface, and even when an impact or the like is accidentally applied from the outside, occurrence of a situation such as breakage or deformation is reduced. In addition,
The first diaphragm 2 is generally formed in a rectangular shape, but is formed in an appropriate shape such as a circle or an ellipse according to the purpose of use.

The driver unit 3 has a basic configuration equivalent to that of a dynamic driver unit provided in a conventional direct-radiation speaker for a high frequency range. The driver unit 3 shown in FIG. 1 is a so-called inner-magnet type driver unit, and includes a diaphragm 5 (hereinafter, referred to as a second diaphragm 5) and a voice coil for causing the second diaphragm 5 to vibrate. And a magnetic circuit unit 7 for driving the voice coil unit 6 based on a reproduction input signal. The driver unit 3 also has a response characteristic to a reproduced input signal in a low frequency band, but emits a reproduced output mainly in a high frequency range from the assembled second diaphragm 5.

The second diaphragm 5 is made of, for example, a light metal such as aluminum, a synthetic resin such as styrene resin, cone paper, or bakelite containing cloth. The second diaphragm 5 is thin and durable, and does not deform or deteriorate with changes in temperature or humidity. Second diaphragm 5
Has an outer peripheral edge attached to the bobbin 8 of the voice coil unit 6 over the entire circumference. The voice coil unit 6 includes a bobbin 8 and a coil 9 formed by winding a bobbin 8 around the bobbin 8. The above-described second diaphragm 5 is combined with the voice coil unit 6 so as to close one end of the bobbin 8.

The magnetic circuit section 7 includes members such as a yoke 10, a magnet 11, a center pole 12, a plate 13, and a damper 14. The yoke 10 is formed in a bottomed cylindrical shape including a bottom portion 10a and an outer pole portion 10b formed of an outer peripheral wall integrally formed on the outer peripheral portion. One side of the magnet 11 is attached to the inner surface of the bottom surface 10 a of the yoke 10. The magnet 11 has a slightly thick disk shape, and when attached to the yoke 10, the other side surface forms substantially the same plane as the opening edge of the outer pole portion 10 b of the yoke 10.

The center pole 12 has an outer diameter of the yoke 1.
The outer pole portion 10b is formed to have a thin disk shape slightly smaller in diameter than the inner diameter of the outer pole portion 10b, and is attached to one side surface of the magnet 11 in a magnetically integrated manner. Plate 1
3 has a ring shape whose outer diameter is substantially the same as the outer pole portion 10 b of the yoke 10 and whose inner diameter is slightly larger than the outer diameter of the center pole 12. The thickness of the plate 13 is substantially equal to the thickness of the center pole 12, and the plate 13 is magnetically integrated and attached to the open end of the outer pole portion 10b of the yoke 10. An annular magnetic gap is formed between the center pole 12 and the plate 13. The magnetic circuit portion 7 is formed by the above-described constituent members by the bottom portion 10a of the yoke 10 and the magnet 1
1-Center pole 12- (Magnetic gap) -Plate 1
3-External pole part 10b of yoke 10-Bottom part 1 of yoke 10
0a is configured.

The driver unit 3 includes a voice coil unit 6
Are combined with the magnetic circuit portion 7 such that the coil 8 is positioned in a magnetic gap formed by the center pole 12 and the plate 13. The driver unit 3 connects the bobbin 8 and the plate 13 by a damper 14 formed in an annular shape by an elastic member so that the voice coil unit 6 is axially oriented (a direction orthogonal to the bottom surface 10a of the yoke 10). Is supported so as to be able to vibrate freely.

The driver unit 3 has a mounting hole 10e formed in the bottom surface 10a of the yoke 10 communicating with a mounting hole 2e formed in the first diaphragm 2, and the sound emission surface 2a of the first diaphragm 2 is formed. Is applied to. The driver unit 3 includes mounting screws 15a, 1 screwed into the mounting holes 2e from the rear surface 2b side.
5b is screwed down to the mounting hole 10c to be securely attached to the sound emitting surface 2a of the first diaphragm 2. The driver unit 3 is provided with a yoke 10 that is similarly hard, has high mechanical strength, and approximates mechanical impedance to the first diaphragm 2 formed of the panel material having such high hardness and high mechanical strength. Attached. In the driver unit 3, the bottom portion 10 a of the yoke 10, which is a joining portion, forms a driving portion for the first diaphragm 2.

A playback input signal is supplied to the driver unit 3 from the playback input signal supply circuit (not shown) to the speaker device 1 configured as described above. Speaker device 1
The first diaphragm 2 and the second diaphragm 5 are driven by the driver unit 3 to emit a reproduced output. The speaker device 1 emits a reproduction output in a low frequency range from the first diaphragm 2 and emits a reproduction output in a high frequency range from the second diaphragm 5. The sound output operation of the reproduction output in the high-frequency range by the operation of the second diaphragm 5 is the same as that of the conventional direct-radiation speaker for the high-frequency range. It is driven and the reproduction output is emitted.

Further, in the speaker device 1, a partial bending operation occurs on the entire surface of the first diaphragm 2 with the bottom portion 10 a of the yoke 10 as a joint portion as a driving point due to the vibration operation of the driver unit 3. Playback output sound is emitted.
That is, in the speaker device 1, when the voice coil unit 6 vibrates, the reaction force acts on the magnetic circuit unit 7, and the first diaphragm 2 is vibrated via the magnetic circuit unit 7.

For example, in a conventional cone-type dynamic speaker, the vibration operation of the voice coil section is achieved by forming the members constituting the magnetic circuit section of the driver unit and the casing section such as the frame from a material having high mechanical strength. It is configured to prevent the housing from vibrating due to the reaction force accompanying the above. Therefore, the driver unit 3
For example, the yoke 10 and the plate 13 of the magnetic circuit section 7 are formed of a material having high mechanical strength. Also,
As described above, the first diaphragm 2 is formed of a panel material that is hard and has high mechanical strength, and thus has a configuration that is heavier than the second diaphragm 5. When the first diaphragm 2 is directly driven by the voice coil unit 6, it cannot vibrate efficiently due to its large weight.

In the speaker device 1, the reaction force of the voice coil unit 6 driven by the reproduction input signal is applied to the yoke 10 of the magnetic circuit unit 7 whose mechanical impedance is close to that of the first diaphragm 2. In the speaker device 1, the vibration energy is transmitted as longitudinal waves from the yoke 10 to the first diaphragm 2, so that the first diaphragm 2 vibrates. The speaker device 1 includes a first diaphragm 2
In this case, a partial bending operation is transmitted over the entire surface from the joint portion with the yoke 10, and the reproduced output is emitted. In the speaker device 1, the transmission loss at the driving point is reduced by such a configuration, and the first diaphragm 2 is efficiently vibrated, whereby a high-sensitivity reproduction output is performed.

The reproduced output in the low-frequency range has a poor sound image localization feeling, and has a characteristic that the direct-radiation type loudspeaker is localized on the speaker device in charge of the high-frequency range. Since the speaker device 1 has a configuration in which the reproduction output in the low-frequency range causes a partial bending operation on the entire surface of the first diaphragm 2 to emit sound as described above, the first diaphragm 2 It has a characteristic that it is difficult to obtain a clear sound image localization feeling when operated alone. In the speaker device 1, the driver unit 3 directly drives the second diaphragm 5 to emit a high-frequency reproduction output, so that the reproduction output based on the reproduction input signal has a clear sound image localization feeling. Can be obtained. Therefore, the speaker device 1 constitutes a speaker system that can obtain a clear sound image localization feeling in a wide range from a low range to a high range.

As described above, in the speaker device 1, the first diaphragm 2 having a relatively large vibration area is efficiently vibrated, and the outer peripheral portion 2c excluding the fixed portion 2d is in an unconstrained state. Therefore, a reproduced output is emitted with a good frequency response characteristic even for a reproduced input signal in a low frequency band. Further, the speaker device 1 uses a driver unit 3 that is generally used in the past, and does not require a support member such as an arrowhead or a frame for supporting the outer peripheral portion 2c of the diaphragm 2, so that the number of parts is small. The assembly process is rationalized and the cost is reduced. Further, the speaker device 1 enables a low-frequency output of a larger volume as compared with a conventional speaker device having the driver unit 3 of the same specification.

As described above, the loudspeaker device 1 does not require a resonance box or an acoustic tube as in the conventional loudspeaker device, so that it is small and thin. Also, the speaker device 1
Since the sound emission surface 2a of the first diaphragm 2 has a panel shape, its outer shape or surface design can be developed relatively freely.
Applications such as writing a picture on a, sandwiching a picture or picture, or projecting an appropriate picture or figure become possible.

The speaker device 1 includes a first diaphragm 2
However, since it is solely responsible for the emission of low-frequency reproduction output, the vibration system of the driver unit 3 can be configured with its low-frequency limit frequency set lower, or can be configured to suppress unnecessarily high-frequency vibration. Can be performed independently. Further, in the speaker device 1, since the second diaphragm 5 is solely responsible for emitting the reproduced output in the high-frequency range, the driver unit 3 that drives the speaker unit 1 is used for the high-frequency range assigned to the second diaphragm 5. It can be configured with a small and inexpensive device limited to the response band.

The speaker device 1 can be variously developed based on the above-described configuration as a basic mode. The speaker device 1
For example, the first diaphragm 2 may be configured by a mounting plate made of a different material at a joint portion where the driver unit 3 is joined. The mounting plate is, for example, the first diaphragm 2
Are formed by insert molding, and a material that improves response characteristics to a specific input frequency is selected. By adopting such a configuration, the speaker device 1 has different vibration characteristics between the first diaphragm 2 and the mounting plate, and has a mechanically equivalent function to a so-called two-way speaker device.

In the speaker device 1, the first diaphragm 2 has its fixed portion 2d supported by the stand 4, but the driver unit 3 is supported by the stand 4 and the first vibration By supporting the plate 2, the outer peripheral portion 2c may be in an unconstrained state over the entire periphery. Note that, in the speaker device 1, the driver unit 3 is not limited to the above-described inner-magnet type driver unit, and a so-called outer-magnet type driver unit in which a magnet is arranged in an outer peripheral region of the yoke may be used.

The above-described features of the speaker device 1 are not impaired at all by the support posture of the first diaphragm 2. Therefore, the speaker device 1 is disposed on a ceiling surface, a wall surface, or the like, for example, so that a limited indoor space is effectively used. The speaker device 1 is configured to be small, thin, and lightweight despite emitting a good low-range sound reproduction output. Floor space is not occupied significantly.

FIG. 3 shows a speaker device 20 shown as a second embodiment. As will be described later in detail, a baffle plate 21 functions as a diaphragm, and the baffle plate 2
1st first driver unit 3 having second diaphragm 5
0 and a second driver unit 31 for causing the baffle plate 21 to vibrate. Since the baffle plate 21 has the same action as the first diaphragm 2 in the above-described speaker device 1,
In the following description, it is referred to as a first diaphragm 21. Also, the first
Driver unit 30 and second driver unit 3
1 has the same basic configuration as that of the driver unit 3 of the above-described speaker device 1, and the description thereof will be omitted by assigning the same reference numerals to corresponding members.

The first diaphragm 21 is formed in substantially the same material and shape as the above-described diaphragm 2, and has one main surface as a sound emitting surface 21a and the other main surface as described later. And a driven surface 21b which receives a driving force from the second driver unit 31. Although not shown, the first diaphragm 21 has one end fixed to a stand similarly to the first diaphragm 2 of the speaker device 1 described above, and the other outer peripheral portion is supported in an unconstrained state. The first diaphragm 21 is attached to the stand, for example, by attaching the second driver unit 31 so that the outer peripheral portion is supported in an unconstrained state over the entire periphery via the second driver unit 31. Is also good.

The first diaphragm 21 has a mounting hole 21c for mounting the first driver unit 30, and a mounting hole 21d for mounting the second driver unit 31. Mounting hole 21c
Has an inner diameter slightly larger than the outer diameter of the outer pole portion 10 b of the yoke 10 constituting the outermost diameter portion of the first driver unit 30. An isolator 22 made of a vibration absorbing material such as rubber or felt is attached to the mounting hole 21c. The isolator 22 acts so that the influence of the vibration operation of the first diaphragm 21 driven by the second driver unit 31 does not directly affect the first driver unit 30.

The first driver unit 30 is positioned on the driven surface 21b side with respect to the first diaphragm 21, and
The second diaphragm 5 is fitted into the mounting hole 21c from the side where the second diaphragm 5 is provided. The first driver unit 30 includes the yoke 1
The outer periphery of the zero outer pole portion 10b is held by the isolator 22 so that the second diaphragm 5 is combined with the first diaphragm 21 in a state where the second diaphragm 5 is exposed to the sound emitting surface 21a.
The first driver unit 30 includes the isolator 2
For example, the bottom surface portion 10a of the yoke 10 may be fixed to the sound emission surface 21a of the first diaphragm 21 without passing through the second diaphragm 2.

The second driver unit 31 has a configuration in which the second diaphragm 5 is removed from the first driver unit 31 described above. The second driver unit 31 is provided with a mounting hole in the bottom surface 10a of the yoke 10, though the details are omitted. In the second driver unit 31, the bottom surface 10a of the yoke 10 is
The first vibration plate 21 is firmly attached to the first diaphragm 21 by the attachment screw 15 screwed into the attachment hole 21d in a state where it is applied to b.

The second driver unit 31 includes:
It goes without saying that an equivalent product to the above-described first driver unit 31 having the second diaphragm 5 may be used. Second
Since the effect of suppressing the vibration in the high frequency range is expected by increasing the mass of the vibration system such as the voice coil unit 6 to a certain extent, the driver unit 31 of FIG. You may comprise so that members may be combined. The second driver unit 31 may be attached to the sound emitting surface 2a side of the first diaphragm 2 in the same manner as the driver unit 3 of the speaker device 1 described above.

The speaker device 20 configured as described above
The first driver unit 30 and the second driver unit 31
Are supplied with a reproduction input signal. Speaker device 2
In the case of 0, the second diaphragm 5 is driven by the first driver unit 30, and a reproduction output in a high frequency range is directly emitted by the vibration operation of the second diaphragm 5.

In the speaker device 20, the first diaphragm 21 is driven by the second driver unit 31, and the reproduced output in the low frequency range is emitted. The speaker device 20 includes a second driver unit 3 driven based on the reproduction input signal.
The reaction force of the first voice coil unit 6 is applied to the yoke 10 of the magnetic circuit unit 7 whose mechanical impedance is close to that of the first diaphragm 21. The speaker device 20 uses the yoke 1
The vibration energy becomes a longitudinal wave from 0 and the first diaphragm 21
, And a partial bending operation occurs on the entire surface of the first diaphragm 21 to emit a reproduced output. In the speaker device 20, the transmission loss at the driving point is reduced, and the first diaphragm 21 is efficiently vibrated, whereby a high-sensitivity reproduction output is performed.

FIG. 4 is a diagram showing an example of the configuration of a reproduction input signal supply circuit for supplying a reproduction input signal to the above-described speaker device 20. The speaker device 20 includes a sound source 40
Are subjected to a filtering process for dividing a frequency band in a reproduction input signal supply circuit section, and are supplied to the first driver unit 30 and the second driver unit 31, respectively. The first driver unit 30 is supplied with a reproduction input signal from a sound source 40 through a series circuit of a volume 41 for adjusting the volume of a reproduction output, an amplifier 42, and a capacitor 43 for cutting low-frequency components. The second driver unit 31 has a sound source 4
From 0, a reproduction input signal is supplied through a low-pass filter 44 and an amplifier 45.

The loudspeaker device 20 emits a high-frequency reproduction output from the second diaphragm 5 driven by the first driver unit 30, so that a clear sound image localization feeling can be obtained. In the speaker device 20, the supply of the reproduction input signal in the high frequency band to the second driver unit 31 is cut off by the low-pass filter 44, so that the sound image localization feeling becomes clearer. Note that the low-pass filter 44 includes a first diaphragm including the second diaphragm 5.
The one having a filter coefficient for blocking an input frequency close to the lower limit frequency on the driver unit 30 side is used.

Since the volume of the reproduction output in the high frequency range emitted from the second diaphragm 5 is adjusted by the volume 41 of the speaker device 20, the volume of the low frequency range emitted from the first diaphragm 21 is adjusted. A balance with the reproduction output is achieved, so that the reproduction output with good sound quality is emitted. Further, the speaker device 20 adjusts the volume 41 to change the volume balance between the reproduced output emitted from the first diaphragm 21 and the reproduced output emitted from the second diaphragm 5. Thus, it is possible to obtain the user's preference for sound quality and the preference of the sound field expression of the source. Note that the speaker device 20
For example, the same characteristics can be obtained by attaching an attenuator (attenuator) to the first driver unit 30 or providing independent amplifiers for the first driver unit 30 and the second driver unit 31, for example. It becomes possible.

The reproduction input signal supply circuit is not limited to the above-described configuration. For example, the reproduction input signal supply circuit may be configured by disposing the volume 41 after the amplifier 42 or the capacitor 43. The reproduction input signal supply circuit unit includes an amplifier 4 that independently drives the first driver unit 30 and the second driver unit 31.
2 and 45 are provided. For example, the first and second driver units 30 and 31 are configured to be supplied with the above-described filtered reproduction input signal to the amplifier in the previous stage to drive the first and second driver units 30 and 31. Is also good.

In the speaker devices 1 and 20, the first diaphragms 2 and 21 need not be baffle plates having a uniform surface density as a whole. That is, in the speaker device 50 shown in FIG. 5, the mass member 53 made of, for example, lead tape or the like is attached to the outer peripheral portion of the sound emission surface 51a of the first diaphragm 51, so that the first diaphragm 51 The configuration is such that the mass of the outer peripheral portion is increased. First diaphragm 51
The driver unit 52 is mounted in a state in which the second diaphragm 54 is exposed at a central portion thereof. The speaker device 50 has the same configuration as that of the above-described speaker device 1 except that the mass member 53 is attached to the first diaphragm 51, and thus the description of the configuration is omitted. Although the first diaphragm 51 is illustrated in such a manner that the outer peripheral portion is in an unconstrained state over the entire region, it is needless to say that one end may be fixed similarly to the speaker device 1. It is.

The speaker device 50 has a structure in which the first diaphragm 51 is supported with its outer peripheral portion being unconstrained, and
Due to the attachment of 3, the vibration of the outer peripheral portion is easily caused even in a low frequency band by the action of the mass member 53. Therefore, in the speaker device 50, the frequency of occurrence of the vibration mode in the low frequency band is reduced, in other words, the lowest resonance frequency is reduced. As a result, the speaker device 50 can obtain a stable reproduction output in a low frequency band, thereby expanding the reproduction effective frequency band.

Further, the speaker device 50 has the function of obstructing the transmission of vibration in the first diaphragm 51 by adhering the mass member 53 to another portion of the sound emission surface 51a of the first diaphragm 51. It may be configured to play. This makes it difficult for the speaker device 50 to have a peak, and the response characteristic according to the input frequency becomes moderate, so that a reproduced output with natural sound quality can be obtained. The mass member 53 is not limited to the tape-like lead material described above, but may be made of other material having a large vibration loss or a material having a large vibration-proof effect.

In each of the above-described speaker devices, the first diaphragm is driven by one driver unit. However, the first diaphragm may be driven by a plurality of driver units 3. In such a speaker device, an independent bending operation is generated in each part of the first diaphragm by the plurality of driver units. In the speaker device, each driver unit does not drive the node position in each frequency band unless the node position of each driver unit is intentionally set as the vibrating position with respect to the first diaphragm. In the speaker device, with such a configuration, each driver unit complements the driving of the first diaphragm at the nodal position in each frequency band, so that generation of sharp peaks and dips in the frequency response characteristics is suppressed. become. Since the speaker device is driven at a plurality of locations by each driver unit, a unique reproduction output corresponding to the size of the first diaphragm and the material characteristics thereof is reduced, so that a reproduction output having a so-called habit-free sound quality is performed. Become like

Further, in the speaker device, by appropriately arranging each driver unit with respect to the first diaphragm, the vibration mode which is likely to be generated due to the material of the speaker unit is intentionally changed so as to intentionally change the first vibration mode. An excessively large vibration mode generated in the plate can be suppressed, and a required vibration mode can be generated. Therefore, in the speaker device, the vibration mode of a specific frequency in a specific direction is suppressed, and the sound quality is stabilized and improved.

The speaker device may be configured to drive the first diaphragm by, for example, independently supplying a reproduction input signal or switching a phase to each driver unit. For this reason, the reproduction input signal supply circuit section includes, for example, an amplifier that amplifies the reproduction input signal supplied from the sound source, and a changeover switch and a volume that are independently connected between the amplifier and each driver unit. And a series circuit. Each of the changeover switches performs on / off switching operation of the input of the reproduction input signal to each driver unit, and also performs the operation of switching the phase of the reproduction input signal in the input ON state. Each volume adjusts the level of a reproduction input signal input to each driver unit to individually adjust the sensitivity of each driver unit.

In the speaker device, a reproduction input signal having a required phase component is supplied to each driver unit from the supply circuit unit, and each of these driver units is operated independently to drive the first diaphragm. Emit the playback output. Therefore, the speaker device does not require a special circuit element or a switching device, and can obtain a reproduction output in which the sound field, the sound quality, and the like are appropriately changed by a very simple operation by the user.

The speaker device may be configured to drive the first diaphragm by performing the above-described filter processing for frequency division of the reproduced input signal for each driver unit 3. For this reason, the speaker device is supplied with a band-pass filter to which a reproduction input signal is supplied from a sound source, a switch unit connected to each of the band-pass filters, and a reproduction input signal through each of these switch units. And a reproduction input signal supply circuit section including an amplifier and the like inserted between each mixer and each driver unit.

The band pass filter divides a reproduction input signal supplied from a sound source into predetermined frequency bands. Each changeover switch unit is constituted by a plurality of changeover switches connected to the respective mixers.
In addition to the operation of switching off, the operation of switching the phase of the reproduction input signal is performed in the input on state. Each mixer synthesizes a reproduction input signal of a predetermined frequency band supplied from each changeover switch unit, and inputs the synthesized signal to each amplifier. Each amplifier amplifies the combined reproduction input signal and supplies it to the driver unit.

According to the above configuration, the playback input signal is divided into a plurality of frequency bands from the playback input signal supply circuit, and the playback input signal adjusted to the required phase component is supplied to each driver unit. Each driver unit is operated independently to drive the first diaphragm to emit reproduced sound. The speaker device is configured such that, for example, in a low frequency band, a reproduction input signal of an in-phase component is input to each driver unit, and in a middle frequency band and a high frequency band, a reproduction input signal of an in-phase component is input. .

In the speaker device, when the reproduced input signal of the in-phase component is supplied to each driver unit in the low frequency band, a large bending operation is caused by the first diaphragm. Therefore, in the speaker device, a signal in a low frequency band is generated, so that the response characteristic is improved, that is, the sensitivity is improved. Further, in the speaker device, when the reproduced input signal of the opposite phase component in the middle frequency band and the high frequency band is supplied to each driver unit and the first diaphragm is driven, a frequency band that is mutually offset is generated. By reducing the overall sensitivity, a reproduction output with the overall sensitivity flattened is output.

The loudspeaker device may be provided with a digital filter for performing a filtering process such as separating a specific frequency band where a dip portion or an excessive peak is generated in the reproduction input signal supply circuit portion. The reproduction input signal supply circuit section includes, for example, a plurality of digital filters that perform appropriate filtering on a reproduction input signal supplied from a sound source, and amplifies the reproduction input signal that has passed through each of the digital filters to generate a driver unit. And an amplifier for driving each.

The loudspeaker device performs a filtering process such that the reproduced input signal supplied from the sound source is separated into a specific frequency band in which a dip portion or an excessive peak is generated by each digital filter having an inverse filtering effect of an impulse response. Is performed and supplied to each driver unit to drive the first diaphragm, so that a reproduced output having a flattened reproduction frequency characteristic is emitted. Note that the speaker device can emit a reproduction output in which only a specific frequency band is emphasized by appropriately selecting each digital filter. Further, the speaker device uses not only a digital filter but also an appropriate analog filter, and performs not only a filtering process of a specific frequency band but also an appropriate signal process such as an amplitude and a phase on a reproduced input signal. You may.

In the loudspeaker device, for example, a directional characteristic may be changed by providing a control unit for controlling the above-mentioned filters so that the filter coefficients are updated with time. By adopting such a configuration, the speaker device can generate a special acoustic effect such as rotation and movement of the sound emission axis without using a special mechanical configuration.

The loudspeaker device may be configured such that an appropriate delay component is added to a filter coefficient for each filter that performs a filtering process, supplies a reproduced input signal to each driver unit, and drives them. With this configuration, the loudspeaker device controls the sound wave front of the reproduced output emitted from the first diaphragm, and can shift the main axis of the loudspeaker from the front as appropriate, thereby increasing the loudspeaker.

The loudspeaker device drives the driver units disposed on the first diaphragm at geometrically symmetrical positions by supplying reproduction input signals of opposite phases to each other, thereby driving the first diaphragm in a specific frequency band. Irrespective of the material of the vibrating plate, it is possible to forcibly generate nodes of vibration at equidistant positions of these driver units. Therefore, the speaker device can adjust the sensitivity of each frequency band, improve the reproduction frequency characteristic, or adjust the sound field and sound quality, etc., by skillfully utilizing such a phenomenon. Of course, the filter processing of the reproduction input signal may be performed by appropriately combining the filters for each driver unit.

[0068]

As described above in detail, according to the speaker device of the present invention, the panel-shaped first diaphragm and the driver are driven by the reaction force of the driver unit that vibrates based on the reproduction input signal. A second diaphragm directly driven by a voice coil of the unit, wherein the first diaphragm emits a low-range reproduction output and the second diaphragm emits a high-range reproduction output. By eliminating the need for a large-diameter bass speaker,
Despite being thin and lightweight, it has excellent frequency response characteristics and directional characteristics in a wide range from the low range to the high range, and can emit reproduced output with a clear sound image localization feeling. It is said.

According to the loudspeaker device of the present invention, a treble-range speaker emits a high-range reproduction output based on the sound-reproduction input signal, and the baffle plate is vibrated by the reaction force of the driver unit. The low-range playback output is emitted, eliminating the need for a large-diameter low-range speaker, making it excellent in a wide range from low to high, despite being small, thin and lightweight. It is possible to emit reproduced output having frequency response characteristics and directivity characteristics and a clear sound image localization feeling.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a speaker device shown as a first embodiment of the present invention.

FIG. 2 is a perspective view of the speaker device.

FIG. 3 is a longitudinal sectional view of a main part of a speaker device shown as a second embodiment of the present invention.

FIG. 4 is a configuration diagram of a reproduction input signal supply circuit unit provided in the speaker device.

FIG. 5 is a perspective view of a speaker device shown as a third embodiment of the present invention.

[Explanation of symbols]

1, 20, 50 speaker device, 2, 21, 51 first
Diaphragm, 3 driver units, 4 stands, 5
Second diaphragm, 6 voice coil section, 7 magnetic circuit section,
8 bobbin, 9 coil, 10 yoke, 11 magnet, 12 center pole, 13 plate, 14 damper, 30 first driver unit, 31 second driver unit, 40 sound source, 41 volume, 4
2, 45 amplifier, 43 capacitor, 44 low-pass filter, 53 mass material

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kohei Asada 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation

Claims (10)

[Claims] A first diaphragm which is hard and has mechanical strength, is formed in a panel shape, and is supported in an unconstrained state so that an outer peripheral portion freely vibrates in a thickness direction; a voice coil unit and a reproduction input; A magnetic circuit unit for vibrating the voice coil unit based on a signal, at least one or more driver units fixed to a main surface of the first diaphragm via a component of the magnetic circuit unit; A second diaphragm that is light and thin and is directly vibrated by the vibration operation of the voice coil unit, wherein the driver unit acts on a component of the magnetic circuit unit by the vibration operation of the voice coil unit. The reaction force causes divided vibration on the entire surface of the first diaphragm to emit a low-range reproduction output, and drives the second diaphragm to emit a high-range reproduction output. A speaker device characterized by the above-mentioned. 2. The speaker device according to claim 1, wherein a constituent member of the magnetic circuit unit fixed to the first diaphragm is a yoke. 3. The speaker device according to claim 1, wherein the first diaphragm is supported in an unconstrained state so that at least half of an outer peripheral portion freely vibrates in a thickness direction. 4. The speaker device according to claim 1, wherein the first diaphragm is provided with a mass member that increases a weight density at least in a portion that freely vibrates in a thickness direction. 5. A baffle plate, a high-range speaker attached to the baffle plate, a voice coil unit, and a magnetic circuit unit that vibrates the voice coil unit based on a reproduction input signal. A driver unit fixed via a component member of the magnetic circuit unit, wherein the baffle plate is vibrated based on a reproduction input signal, and the reaction force of the voice coil unit of the driver unit is applied to the magnetic circuit. A speaker device which functions as a diaphragm that emits a reproduction output in a low-frequency range by generating divided vibrations over the entire surface via constituent members of the unit. 6. The filter processing is performed on the driver unit and the treble speaker so that a frequency component emitted from the treble speaker is not emitted from the baffle plate driven by the driver unit. The speaker device according to claim 5, wherein the applied reproduction input signal is supplied. 7. At least the treble speaker includes:
The speaker device according to claim 5, wherein the reproduction input signal is supplied via a volume control unit that controls the volume of the reproduction output. 8. The speaker device according to claim 5, wherein a constituent member of the magnetic circuit unit fixed to the baffle plate is a yoke. 9. The speaker device according to claim 5, wherein the baffle plate is supported in an unconstrained state so that at least half of an outer peripheral portion freely vibrates in a thickness direction. 10. The speaker device according to claim 5, wherein the baffle plate is provided with a mass member for increasing a weight density at least in a portion that freely vibrates in a thickness direction.