JPH11234778A - Speaker system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sound a reproduced output with full of presence with excellent sound quality and abundant sound volume by configuring an omnidirectional sound source over a wide sound frequency range from a low to a high frequencies. SOLUTION: The speaker system is provided with a direct radiation speaker unit 3 mounted on a baffle plate 2a of a speaker cabinet 2 and driver units 4 (4A, 4B, 4C) that are mounted on the baffle plate 2A to cause split vibration to the baffle plate 2A based on a reproduced input signal thereby making the baffle plate 2A like a diaphragm. Low and medium sound frequency components of the reproduced output are emitted from the direct radiation speaker unit 3 and the high sound frequency component is sounded from the baffle plate 2A to attain omnidirectivity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker device, and more particularly, to a loudspeaker device comprising a sound emitting section for emitting a low-frequency reproduction output and a sound emitting section for emitting a high-frequency reproduction output. The present invention relates to a loudspeaker device in which reproduced output is omnidirectional and emits sound.

[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. As a speaker device, a cone-type dynamic speaker (direct radiation speaker) is generally used. The direct-radiation type speaker has a characteristic that it is almost omnidirectional when its diameter is smaller than the wavelength of the sound wave, and the direct-radiation type speaker (woofer) for the mid-low range is almost omnidirectional. It is. On the other hand, many direct-radiation speakers (tweeters) for the high frequency range have a sharp directivity because their apertures are not sufficiently small compared to the wavelength of sound waves.

[0003] In order to emit a reproduction output of a satisfactory frequency response characteristic and sound quality in a sufficient volume in a wide frequency band from a low frequency range to a high frequency range, a plurality of types of speakers generally adapted to the reproduction frequency band are used. It is configured as a composite speaker device combining the devices. 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 speakers conforming to the above-described specifications are incorporated in the enclosure.

[0004] For example, a two-way speaker 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 addition, the three-way speaker device includes, in addition to the woofer and the tweeter described above, a squawker having, for example, good reproduction characteristics in the midrange. A typical speaker system for general users has a diameter of about 10 cm
And a tweeter having a diameter of about 20 mm or more are used.

[0005]

By the way, in the case of the conventional composite speaker device, when listening to the reproduction output substantially at the front position, the reproduction characteristics of each individual speaker device are well maintained, so that the low to high range is obtained. Good sound quality and volume up to the sound range can be obtained. On the other hand, in the conventional combined speaker device, when listening to the reproduced output at a position off the front, the sharp directivity of the tweeter causes a feeling of shortage of the high-frequency component. Further, in the conventional combined speaker device, the reproduced output reflected by the wall surface or the like has a shortage of high-frequency components, resulting in a sound quality that leaves unsatisfactory realism.

The above-mentioned problem is caused, for example, in that a plurality of tweeters are installed in a speaker cabinet in such a manner that the angles of the sound emitting surfaces are shifted from each other, and the reproduced output in the high frequency range is emitted over a wider range. I just need. However, such a speaker device is not only large and expensive as a whole, but also has a problem that sound waves emitted from each tweeter interfere with each other to produce a reproduction output having a frequency characteristic having a sharp peak depending on a listening position. There is not practical. The speaker device is strongly desired to be reduced in size, thickness and weight in accordance with the audio and video devices constituting the main unit, which can be reduced in size and weight or differentiated in design in conjunction with personal use. And must conform to such required specifications.

As a countermeasure against the above-mentioned problem, it is considered that the loudspeaker device adopts a configuration in which the tweeter is installed vertically to the user, that is, upward or downward. However, in such a speaker device, it is possible to slightly widen the directivity from the characteristic of a direct-radiation type speaker in which the lateral sensitivity (90 ° characteristic) decreases as the sound range becomes higher, but the sensation of a high sound range component is insufficient. It does not go away.

On the other hand, 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.

The novel panel-type speaker device has factors that determine the bending operation of the diaphragm, namely, surface density, bending rigidity,
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 a single 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 equivalent to those of the conventional speaker device, but also achieves compatibility.
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.

Therefore, the present invention skillfully utilizes the features of the novel panel-type speaker device described above to constitute a small, thin, and lightweight omnidirectional sound source in a wide range from a low range to a high range. This has been proposed for the purpose of providing a loudspeaker device capable of emitting a realistically reproduced output with good sound quality and volume.

[0016]

A speaker device according to the present invention that achieves this object includes a speaker cabinet,
A direct emission type speaker unit attached to a baffle plate of the speaker cabinet, and a reproduction output is emitted by generating split vibration in the baffle plate based on a reproduction input signal attached to at least one baffle plate of the speaker cabinet. And a driver unit acting as a vibrating plate for sound. Also, in the speaker device, the driver unit includes a voice coil unit and a magnetic circuit unit that vibrates the voice coil unit based on a reproduction input signal, and the magnetic circuit unit is provided on at least one baffle plate of the speaker cabinet. It is fixed via a member.

According to the loudspeaker device of the present invention having the above-described configuration, a direct-radiation speaker unit to which a reproduction input signal of a low-middle sound component is supplied emits a reproduction output mainly in the middle-low sound range. . Also, the speaker device is
The driver unit is driven based on the sound reproduction input signal of the high-frequency component, and the reaction force of the oscillating voice coil portion is applied to the components of the magnetic circuit portion to generate a divided vibration on the baffle plate, thereby producing a high-frequency range. Is output. Since the speaker device emits a high-frequency reproduction output by split vibration based on a partial bending operation that occurs on the entire surface of the baffle plate, the speaker output almost assumes a state in which the reproduction output is emitted from many sound sources. Construct an omnidirectional sound source. Therefore, the speaker device emits a realistic reproduction output with good sound quality and sufficient volume in a wide sound range from a low range to a high range regardless of the listening position.

[0018]

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
The loudspeaker cabinet 2 includes a woofer 3 that is responsible for emitting a high-frequency reproduction output and a driver unit 4 that is responsible for low-frequency reproduction output. The speaker cabinet 2 has a box shape as a whole, and a front surface 2A of the speaker cabinet 2 forms a baffle plate to which a woofer 3 is attached, and is driven by a driver unit 4 as described later to emit a high-frequency reproduction output. Acts as a diaphragm.

In the speaker device 1 shown in FIG. 1, a first driver unit 4A is attached to a front surface 2A (a baffle plate 2A) on which a woofer 3 is attached to a speaker cabinet 2, and a chain line in FIG. As shown by, the driver units 4B and 4C are also attached to the side surface 2B and the ceiling surface 2C. The driver unit 4 has the speaker cabinet 2
May be attached to the baffle plate 2A, of course. Therefore, in the following description, it is assumed that one driver unit 4 is mounted on the baffle plate 2A.

The speaker cabinet 2 is a so-called bass reflex type cabinet having good characteristics for bass reproduction. Although not described in detail, an acoustic tube is formed in the speaker cabinet 2 and an acoustic opening of the acoustic tube is formed in the baffle plate 2A. 5 are formed. As is well known, the sound wave emitted from the diaphragm of the woofer 3 to the front of the speaker cabinet 2 is emitted from the acoustic opening 5 in such a manner that the sound wave emitted to the back of the diaphragm is aligned in phase. Be sounded. Of course, the speaker cabinet 2 is not limited to such a bass reflex cabinet.

The baffle plate 2A is limitedly operated as a diaphragm that emits a high-frequency component of the reproduction input signal as described above. Therefore, the speaker cabinet 2
Since the baffle plate 2A is not required to be supported in an unconstrained state so that the outer peripheral portion thereof can be freely vibrated, and the low-frequency component can be emitted, the configuration is the same as that of the conventional speaker cabinet. You. Of course, the baffle plate 2A may be configured such that the outer peripheral portion is partially fixed as described later.

The woofer 3 is equivalent to a well-known cone type woofer used in a conventional speaker device, and includes a driver unit and a diaphragm, although detailed description and illustration are omitted. The diaphragm is formed in a cone shape using a light metal such as aluminum, a synthetic resin such as styrene resin, cone paper or a bakelite containing cloth, and generally has a thickness gradually increasing from an inner peripheral portion to an outer peripheral portion. It has been thinned. Further, the outer peripheral edge of the diaphragm is supported by the frame via arrow paper over the entire periphery. The frame serves to connect the diaphragm and the driver unit and to protect the diaphragm. Also,
The frame is provided with an appropriate cutout window in order to prevent the vibration plate from being affected by a reaction due to the vibration operation. The sheet of paper acts to hold the outer peripheral edge of the diaphragm and prevent the diaphragm from contacting the mounting portion of the cabinet during the vibration operation of the diaphragm.

The woofer 3 includes a driver unit including a voice coil unit coupled to the inner peripheral portion of the diaphragm, and a magnetic circuit unit for causing the voice coil unit to vibrate based on a reproduction input signal. The woofer 3 is, as shown in FIG.
The frame is fixed to the baffle plate 2A so that the diaphragm is exposed to the outside, so that the diaphragm is assembled to the speaker cabinet 2. As will be described in detail later, the woofer 3 directly emits the reproduction output of its mid-range and low-range components directly to the outside based on the reproduction input signal.

Since the aperture of the woofer 3 is smaller than the wavelength of the sound wave of the reproduced output of the mid-range and low-frequency components emitted from the diaphragm, the woofer 3 converts these reproduced outputs to an almost omnidirectional sound source. Configure and emit sound. The wavelength of the sound wave is, for example, about 3.4 m at 100 Hz, but 1000 H.
It is about 34 cm in z.

The driver unit 4 has the basic structure of a conventional direct-radiation speaker device, in other words, the woofer 3.
What is equivalent to the driver unit provided in the device is used. The driver unit 4 shown in detail in FIG.
Is a so-called inner-magnet type dynamic driver unit, but the driver unit is not limited to this. For example, an appropriate driver unit such as an outer-magnet type dynamic driver unit or a piezoelectric type driver unit including a piezoelectric element is used. It is, of course, possible to do so. In the driver unit 4, the yoke 14 constituting the magnetic circuit unit 11 is fixed to the baffle plate 2, which will be described in detail later. For example, the plate 17 and the voice coil unit 10 side are fixed to the baffle plate 2. Needless to say, this may be done. Further, the driver unit 4
You may make it attach to the sound emission surface 2a side of the baffle board 2A.

The driver unit 4 includes the voice coil unit 1
0, and a magnetic circuit section 11, which is equivalent to the above-described driver unit of the woofer 3 with the diaphragm removed. The voice coil unit 10 includes a bobbin 12
And a coil 13 formed by winding a bobbin on the outer periphery of the bobbin 12. The magnetic circuit section 11 includes a yoke 14
, A magnet 15, a center pole 16, a plate 17, and a damper 18. The yoke 14 is formed to have a bottomed cylindrical shape including a bottom surface portion 14a and an outer pole portion 14b formed of an outer peripheral wall integrally formed on the outer peripheral portion. Magnet 15
Is attached to the inner surface of the bottom surface portion 14 a of the yoke 14. The magnet 15 has a somewhat thick disk shape, and when attached to the yoke 14, the other side surface forms substantially the same plane as the opening edge of the outer pole portion 14 b of the yoke 14.

The center pole 16 has an outer diameter of the yoke 1.
4 is formed in a thin disk shape slightly smaller in diameter than the inner diameter of the outer pole portion 14b, and is magnetically integrated and attached to one side surface of the magnet 15. Plate 1
7 has a ring shape whose outer diameter is substantially the same as the outer pole portion 14 b of the yoke 14 and whose inner diameter is slightly larger than the outer diameter of the center pole 16. The plate 17 has a thickness substantially equal to the thickness of the center pole 16 and is magnetically integrated and attached to the open end of the outer pole portion 14b of the yoke 14. An annular magnetic gap is formed between the center pole 16 and the plate 17. The magnetic circuit portion 11 is formed by the above-described constituent members by the bottom portion 14a of the yoke 14, the magnet 15, the center pole 16- (magnetic gap), the plate 17, the outer pole portion 14b of the yoke 14, and the bottom portion 14a of the yoke 10. It constitutes a magnetic circuit.

The driver unit 4 includes the voice coil unit 1
0 is combined with the magnetic circuit section 11 such that the coil 13 is positioned in a magnetic gap formed by the center pole 16 and the plate 17. The driver unit 4 connects the bobbin 12 and the plate 17 by a damper 18 formed in an annular shape by an elastic member so that the voice coil unit 10 is axially oriented (a direction orthogonal to the bottom surface 14a of the yoke 14). Is supported so as to be able to vibrate freely.

The driver unit 4 is attached to the inner surface 2b of the baffle plate 2A by connecting the mounting hole formed in the bottom surface 14a of the yoke 14 to the mounting hole 2c formed in the baffle plate 2A. The driver unit 4 is firmly mounted on the baffle plate 2A by mounting screws 19a and 19b screwed into the mounting holes 2c from the sound emission surface 2a side to the mounting holes of the yoke 14, respectively. The driver unit 4 is attached to a baffle plate 2A formed of a panel material that is hard and has high mechanical strength via a yoke 14 that is similarly hard, has high mechanical strength, and approximates mechanical impedance. The driver unit 4 is configured such that the bottom surface portion 14a of the yoke 14, which is a joining portion,
It constitutes a driving part for the baffle plate 2A.

In the loudspeaker device 1 configured as described above, a reproduction input signal of a middle and low frequency component is supplied to a woofer 3 from a reproduction input signal supply circuit unit described later in detail, and a reproduction input signal of a high frequency component is input. Signal is driver unit 4
Supplied to In the loudspeaker device 1, the woofer 3 emits the reproduced output in the middle and low frequency range, and the driver unit 4 drives the baffle plate 2A to emit the reproduced output in the high frequency range. Due to the vibration operation of the driver unit 4, the baffle plate 2 </ b> A is partially bent over its entire surface with the bottom portion 14 a of the yoke 14, which is the joining portion, as a driving point, so that the reproduced output is emitted. That is, in the speaker device 1, when the voice coil unit 10 vibrates, the reaction force acts on the magnetic circuit unit 11,
Further, the baffle plate 2A is vibrated through the magnetic circuit unit 11.

By the way, in a conventional cone-type dynamic speaker, for example, the members constituting the magnetic circuit section of the driver unit and the casing such as the frame are formed of a material having high mechanical strength, so that the voice coil section is formed. It is configured to prevent the housing portion from vibrating due to a reaction force accompanying the vibration operation. Therefore, in the driver unit 4, for example, the yoke 14 and the plate 13 of the magnetic circuit section 11 are formed of a material having high mechanical strength. Further, as described above, the baffle plate 2A is formed of a panel material that is hard and has high mechanical strength, and has a large weight. When the baffle plate 2A is directly driven by the voice coil unit 10, the efficiency of vibration is poor due to its large weight, and the sensitivity is slightly deteriorated.

In the speaker device 1, as described above, the voice coil unit 10 driven by the reproduction input signal
Is applied to the yoke 14 of the magnetic circuit portion 7 whose mechanical impedance is close to that of the baffle plate 2A. In the speaker device 1, the vibration energy is transmitted as a longitudinal wave from the yoke 14 to the baffle plate 2A, and the baffle plate 2A vibrates. In the speaker device 1, a partial bending operation is transmitted over the entire surface of the baffle plate 2 </ b> A from the joint portion with the yoke 14 to generate a divided vibration, and a reproduction output is emitted. In the speaker device 1, the transmission loss at the driving point is reduced by such a configuration, and the baffle plate 2A is efficiently vibrated, whereby a high-sensitivity reproduction output is performed.

The speaker device 1 emits a high-frequency reproduction output from the entire surface as if a large number of sound sources exist due to the divided vibration based on the partial bending operation generated on the entire surface of the baffle plate 2A. It constitutes an almost omnidirectional sound source. Since the speaker device 1 emits the reproduced output according to the above principle, even if a large number of driver units 4 are provided in the speaker cabinet 2, the emitted sound waves interfere with each other and the frequency response characteristics and the directivity are increased. There is no significant effect on the characteristics.

FIG. 3 is a diagram showing a measurement of the directional characteristics of the speaker device 1 when a reproduction input signal having an input frequency of 10 kHz and 20 kHz is supplied to the driver unit 4 and the reproduction output is emitted from the baffle plate 2A. . In the figure, the solid line indicates the directivity for an input frequency of 10 kHz, and the broken line indicates the directivity for an input frequency of 20 kHz. As is apparent from FIG. 1, the speaker device 1 has substantially non-directional characteristics in a high-frequency range although there is a small fluctuation.

As described above, the loudspeaker device 1 is configured to supply the reproduced input signal of the high frequency component to the driver unit 4 to drive the baffle plate 2A having a panel shape. It emits sound with almost omnidirectional characteristics. Therefore, since the speaker device 1 emits a substantially omnidirectional mid-low range reproduction output due to the characteristics of the woofer 3, the loudspeaker device 1 combines with the high-range reproduction output from the baffle plate 2A to combine the low-range to high-range reproduction output. It emits omnidirectional playback output over a wide range of sounds. Accordingly, the speaker device 1 emits a realistically reproduced output with a good sound quality and a sufficient volume regardless of the listening position in a wide range from a low range to a high range.

As described above, the speaker device 1 drives the baffle plate 2A having a relatively large vibration area by the commonly used driver unit 4 to emit a reproduction output in a high-frequency range omnidirectionally and with high sensitivity. Therefore, the treble-range loudspeaker does not require a support member such as a sheet of paper or a frame, and the number of parts is small, the assembly process is streamlined, and the cost is reduced. Further, in the speaker device 1, since the baffle plate 2A has a sound emitting surface 2a in a panel shape,
The outer shape or surface design can be developed relatively freely, for example, applications such as drawing a picture, sandwiching a picture or picture, or projecting an appropriate picture or figure on the sound emitting surface 2a are possible. Becomes

FIG. 4 is a diagram showing a configuration example of a reproduction input signal supply circuit for supplying a reproduction input signal to the above-described speaker device 1. In the speaker device 1, a reproduction input signal supplied from the sound source 20 is subjected to a filtering process for dividing a frequency band in a reproduction input signal supply circuit unit, and is supplied to the woofer 3 and the driver unit 4. The woofer 3 includes, from a sound source 20, a volume 21 for adjusting the volume of a reproduction output, and a low- and mid-range component of a reproduction input signal subjected to a filtering process for cutting a high-range component via a low-pass filter 22 and an amplifier 23. Supplied. The driver unit 4 includes a volume 24 for adjusting the volume of the reproduction output, a high-pass filter 25,
Via the amplifier 26 and the capacitor 27 for cutting the direct current component, the low range component of the reproduced input signal that has been subjected to the filtering process for cutting the middle and low range components is supplied.

The loudspeaker device 1 is composed of
4, the volume of the reproduction output of the middle and low frequency range components and the high frequency range components emitted from the baffle plate 2A driven by the woofer 3 and the driver unit 4 can be mutually adjusted. As a result, a reproduction output of good sound quality is emitted. Further, the speaker device 1 adjusts the volumes 21 and 24 to balance the reproduction output of the middle and low frequency components and the high frequency components emitted from the baffle plate 2A driven by the woofer 3 and the driver unit 4. By changing it, it is possible to obtain the user's preference for sound quality and the preference of the sound field expression of the source.

It is needless to say that the reproduction input signal supply circuit section is not limited to the above-described configuration. For example, the respective volumes 21 and 24 are disposed after the amplifiers 23 and 26 or the capacitor 27. You may make it. In the reproduction input signal supply circuit section, amplifiers 23 and 26 for independently driving the woofer 3 and the driver unit 4 are provided. For example, the reproduction input signal frequency-divided by performing the above-described filter processing in the previous stage is provided. May be supplied to the amplifier to drive the woofer 3 and the driver unit 4. Speaker device 1
For example, by attaching an attenuator (attenuator) to each driver unit or providing an independent amplifier, it is possible to obtain the same characteristics.

The speaker device 1 can be variously developed based on the above-described configuration as a basic mode. FIG. 5 shows a speaker device 30 shown as a second embodiment of the present invention, which is characterized by the configuration of a baffle plate 32 to which a woofer 3 of a speaker cabinet 31 is attached. That is, the baffle plate 32 is integrally extended upward with respect to the speaker cabinet 31, and the driver unit 4 is attached to this extended portion to form an attachment portion 32 a. The other configuration of the speaker device 30 is the same as that of the above-described speaker device 1, and the description thereof is omitted.

The speaker device 30 has a structure in which the mounting portion 32a of the driver unit 4 is open at the back. Therefore, the speaker device 30 outputs the reproduced output of the high-frequency component emitted from the baffle plate 32 driven by the driver unit 4 not only from the front surface (sound emitting surface) of the baffle plate 32 but also to the rear side. Will be done. Further, the speaker device 30 has better sensitivity characteristics because the mounting portion 32a of the driver unit 4 formed on the baffle plate 32 has a structure in which the outer peripheral portion is in a non-constrained state and easily vibrates freely.

The loudspeaker device generally has a characteristic that a reproduced output from an omnidirectional sound source is enhanced by a sense of presence. As described above, the loudspeaker device 30 can obtain a richer sense of realism by emitting the reproduced output of the high-frequency component to the four directions from the attachment portion 32a of the baffle plate 32 as described above. In the speaker device 30, the mounting portion 32 of the driver unit 4 is attached to the baffle plate 32.
a is integrally formed as an extension,
May be configured as a separate member and attached to the speaker cabinet 31.

In the speaker device 1 (speaker device 30), for example, the baffle plate 2A may be formed by a mounting plate made of a different material at a joint portion to which the driver unit 4 is joined. For example, when the baffle plate 2A is formed, such a mounting plate is integrated by an insert molding method, and a material that improves response characteristics to a specific input frequency is selected. Speaker device 1
By adopting such a configuration, the baffle plate 2A and the mounting plate have different vibration characteristics, and have a mechanically equivalent function to a so-called two-way speaker device.

Although the single baffle plate 2A is driven by one driver unit 4, the speaker device 1 may be driven by a plurality of driver units 4. In such a speaker device, an independent bending operation is generated in each part of the baffle plate 2A by a plurality of driver units. Speaker device 1
Does not cause each driver unit 4 to drive the node position in each frequency band unless the node position of each driver unit 4 is intentionally set as the vibrating position with respect to the baffle plate 2A. In the speaker device 1, the driver unit 4 complements the driving of the baffle plate 2A at the nodal position in each frequency band by such a configuration, so that the occurrence of sharp peaks and dips in the frequency response characteristic is suppressed. become. Since the speaker device 1 is driven at a plurality of locations by each driver unit 4, a unique reproduction output according to the size of the baffle plate 2A and its material characteristics is reduced, so that a reproduction output with a so-called habit-free sound quality is emitted. Will be done.

Further, in the speaker device 1, by appropriately arranging each driver unit 4 with respect to the baffle plate 2A, the vibration mode which is likely to be caused by the material thereof is intentionally changed so that the inside of the baffle plate 2A is changed. It is possible to suppress an excessively large vibration mode generated in the above and generate a necessary vibration mode. Therefore, in the speaker device 1, the vibration mode of a specific frequency in a specific direction is suppressed, and the sound quality is stabilized and improved.

The speaker device 1 drives the baffle plate 2A by, for example, independently supplying a reproduction input signal or switching the phase to a plurality of driver units 4 for driving the baffle plate 2A. You may. 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 the like. Each changeover switch turns on / off the input of a reproduction input signal to each driver unit.
Along with the off-switching operation, the switching operation of the phase of the reproduction input signal is performed 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 loudspeaker device 1, a reproduction input signal having a required phase component is supplied from a supply circuit section to a plurality of driver units 4 for driving the baffle plate 2A, and these driver units 4 operate independently. Then, the baffle plate 2A is driven to emit a reproduced output. Therefore, the speaker device 1 does not require a special circuit element or a switching device, and can obtain a reproduced 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 1 may be provided with a digital filter for performing a filtering process such as separating a specific frequency band in which 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 apparatus 1 is a filter for separating a specific frequency band in which a reproduced input signal supplied from a sound source generates a dip portion or an excessive peak by each digital filter having an inverse filter function of an impulse response. The processed output is supplied to each driver unit 4 to drive the baffle plate 2A, so that a reproduced output having a flattened reproduction frequency characteristic is emitted. Note that the speaker device 1 can emit a reproduction output in which only a specific frequency band is emphasized by appropriately selecting each digital filter. Further, the speaker device 1 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. It may be.

The loudspeaker apparatus 1 may be configured to change the directional characteristics by providing a control unit for controlling the above-described filters to update their filter coefficients with time, for example. The speaker device 1
By employing such a configuration, it is possible to generate a special acoustic effect such as rotation and movement of the sound output axis without using a special mechanical configuration.

The loudspeaker device 1 is configured such that a filter component is supplied to each of the driver units 4 or the woofers 3 to supply reproduced input signals to drive the loudspeakers 3 and to drive the reproduced input signals. Is also good. With this configuration, the loudspeaker device 1 controls the sound wave front of the reproduced output emitted from the woofer 3 or the baffle plate 2A, and can shift the main axis of the loudspeaker from the front as appropriate, thereby increasing the sound.

The speaker device 1 supplies the baffle plate 2A in a certain specific frequency band by driving the driver units arranged at geometrically symmetric positions on the baffle plate 2A by supplying reproduction input signals having phases opposite to each other. It is possible to forcibly generate nodes of vibration at equally spaced positions of these driver units 4 irrespective of the material. Therefore, the speaker device 1 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 reproduced input signal may be performed by appropriately combining the filters for each driver unit 4.

[0053]

As described in detail above, according to the speaker device of the present invention, the baffle driven by the driver unit while emitting the omnidirectional reproduction output in the low-mid range from the direct-radiation speaker unit. Since the omnidirectional high-range reproduction output is emitted by the plate, an omnidirectional sound source having a wide range from the low-frequency range to the high-frequency range is configured very simply and at low cost. Therefore, the loudspeaker device emits a realistically reproduced output with good sound quality and sufficient volume even at a listening position deviating from the sound emitting surface.

[Brief description of the drawings]

FIG. 1 is a perspective view of a speaker device shown as a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of the speaker device.

FIG. 3 is a directional characteristic diagram of a high sound range emitted from a baffle plate in the speaker device.

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 second embodiment of the present invention.

[Explanation of symbols]

1 speaker device, 2 speaker cabinet, 2A
Baffle plate, 3 direct-radiation speaker unit (woofer) for middle and low range, 4 driver unit for high range, 10
Voice coil section, 11 magnetic circuit section, 12 bobbins,
13 coils, 14 yokes, 15 magnets, 16
Center pole, 17 plates, 18 dampers, 20
Sound source, 21 volume, 22 low pass filter, 2
3 amplifier, 24 volume, 25 high-pass filter, 26 amplifier, 30 speaker device, 31 speaker cabinet, 32 baffle plate, 32a Mounting part of driver unit

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

Claims (7)

[Claims] 1. A speaker cabinet, a direct radiating speaker unit mounted on a baffle plate of the speaker cabinet, and divided into at least one baffle plate of the speaker cabinet based on a reproduced input signal. A driver unit that functions as a diaphragm that emits a reproduced output by generating vibration, wherein the direct radiating speaker unit emits a reproduced output mainly in a middle and low frequency range, and the baffle plate includes the driver unit. Characterized in that the speaker device is driven by the main unit and emits a reproduction output mainly in a high-frequency range. 2. The driver unit includes a voice coil unit and a magnetic circuit unit that vibrates the voice coil unit based on a reproduction input signal. The driver unit includes a magnetic circuit unit on at least one surface of a baffle plate of the speaker cabinet. A divided vibration is generated in the baffle plate via a component of the magnetic circuit unit, which is fixed via a component of the circuit unit and is subjected to a reaction force of the voice coil unit vibrated based on a reproduction input signal. The speaker device according to claim 1, wherein a reproduced output in a high-frequency range is emitted by sound. 3. The speaker device according to claim 2, wherein a constituent member of the magnetic circuit unit fixed to the baffle plate is a yoke. 4. The speaker device according to claim 1, wherein the driver unit is supplied with a reproduction input signal that has been subjected to a filter process for attenuating at least a low-frequency component. 5. At least the driver unit includes:
2. The speaker device according to claim 1, wherein a reproduction input signal is supplied via a volume level adjusting means for adjusting a volume level of the reproduction output to a volume level of a reproduction output of the direct radiation type speaker unit. 6. The baffle plate, wherein a baffle plate to which the direct radiation type speaker unit is mounted is shared, and a back surface of a mounting portion of the driver unit is acoustically opened. 2. The speaker device according to 1. 7. The speaker device according to claim 1, wherein the driver unit is constituted by a baffle plate independent of a baffle plate to which the direct radiation type speaker unit is attached.