JP2000287290A - Speaker system and acoustic reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a noise sound caused by undesired vibration by simplifying the structure of a speaker system adopting a Kelton system of a passive radiator type thereby miniaturizing the speaker system and enhancing the stiffness of the speaker system. SOLUTION: Directly mounting a passive radiator diaphragm 103 with a speaker unit 102, an edge and a damper fitted thereto onto a front baffle 104 forms a font enclosed chamber 106. Thus, a simple structure without the need for the baffle plate is adopted for the speaker system and the simplified structure allows the speaker system to be made small and to enhance the stiffness thereby reducing a noise sound caused by undesired vibration.

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 a sound reproducing device, and more particularly to a speaker device and a sound reproducing device useful for use in a vehicle.

[0002]

2. Description of the Related Art With the spread of digital recording sources such as compact discs, MDs, and DVDs, there is a need for an audio reproducing apparatus capable of sufficiently reproducing these broadband sources.

[0003] In particular, in order to improve the low-frequency reproduction capability, conventionally, a low-frequency reproduction capability has been improved by using a passive radiator-type Kelton system in which a speaker unit and a flush radiator are combined with a speaker device. ing.

Hereinafter, a conventional passive radiator type Kelton type loudspeaker device which improves the low frequency reproduction capability will be described. FIG. 12 is an exploded perspective view of a conventional passive radiator type Kelton type speaker device.

In FIG. 12, reference numeral 1201 denotes a passive radiator unit for actually reproducing sound. 1202
Is a speaker unit for driving the passive radiator unit 1201. Reference numeral 1203 denotes a front baffle to which the passive radiator unit 1201 is attached and forms a part of the speaker box. Reference numeral 1204 denotes a front closed chamber for coupling the sound output of the speaker unit 1202 to the passive radiator unit 1201, and reference numeral 1205 denotes a rear closed chamber for sealing the sound output on the back of the speaker unit 1202. Reference numeral 1206 denotes a sub-baffle plate for mounting the speaker unit 1202 and spatially dividing the front closed chamber 1204 and the rear closed chamber 1205. Reference numeral 1207 denotes a cabinet forming the speaker box.

The operation of the conventional passive radiator type Kelton type speaker device configured as described above will be described below. As shown in FIG. 12, the sound reproduction output radiated from the front of the speaker unit 1202 attached to the sub-baffle plate 1206 that spatially divides the front sealed chamber 1204 and the rear sealed chamber 1205 is output from the speaker unit 1202 or Front baffle 12
Front baffle 1203 through the air in the front sealed chamber 1204 constituted by the front baffle 1203 and the sub baffle plate 1206.
Radiator unit 1201 attached to
By driving the passive radiator 120,
Sound reproduction is performed from step 1. Also, the speaker unit 1
The sound reproduction output radiated from the back side of the 202 does not interfere with the sound reproduction output of the passive radiator 1201,
Speaker unit 1202 and front baffle 120
3. Sub-baffle plate 1206 and cabinet 1207
Is sealed by the rear closed chamber 1205 composed of

FIG. 13 shows an example of a comparison of low-frequency reproduction characteristics showing the superiority of the conventional passive radiator type Kelton system. In FIG. 13, reference numeral 1301 denotes an output sound pressure frequency characteristic of a closed system. In the closed system, the sound reproduction output on the back of the speaker unit is sealed in the speaker box to avoid interference with the sound reproduction output on the entire surface of the speaker unit, but if the volume of the speaker box is not large enough, As a result, the compliance with the speaker unit is reduced, and the low-frequency reproduction capability is limited as seen from 1301 in FIG. Reference numeral 1302 denotes a phase inversion type output sound pressure frequency characteristic using the same type of speaker unit and speaker box. The phase inversion method is a method in which the sound reproduction output on the back of the speaker unit is resonated at a certain frequency (hereinafter, referred to as an anti-resonance frequency) from inside the speaker box through a duct, and mixed with the sound reproduction output on the front of the speaker unit. The sound reproduction output through this duct has the same phase as the sound reproduction output on the front of the speaker unit in the band above the anti-resonance frequency,
The radiation efficiency is improved by the interaction, and the low-frequency reproduction limit can be extended as compared with the sealed system. However, the sound reproduction output via this duct has an opposite phase to the sound reproduction output on the front surface of the speaker unit in a very low frequency range, and cancels out. For this reason, in a very low frequency band, a sharp attenuation curve of about -20 dB / oct occurs, so that there is a disadvantage that sufficient heavy bass reproduction cannot be obtained.

Reference numeral 1303 denotes the output sound pressure frequency characteristic of the conventional passive radiator type Kelton system using the same type of speaker unit and speaker box. The passive radiator type Kelton system resonates the passive radiator unit, the speaker unit, and each closed chamber in the speaker box at a certain frequency similarly to the phase inversion system, and can extend the low-frequency reproduction limit. In addition, since the sound reproduction output of the passive radiator unit and the sound reproduction output of the speaker unit are not mixed even in the very low frequency range, the sound reproduction output is about -12 which is the same as that of the closed type even in the ultra-low frequency band.
A gradual attenuation curve of dB / oct is obtained, and sufficient bass reproduction can be obtained. In addition, in a frequency band higher than a specific frequency, the passive radiator diaphragm does not vibrate even if the speaker unit vibrates, so that the low-range speaker reproducing device can also have excellent bandpass characteristics.

As described above, the conventional passive radiator-type Kelton system has the advantage of the closed system, the ability to reproduce heavy bass sound due to the gradual attenuation characteristics of the ultra-low range, and the advantage of the low frequency reproduction, which is the advantage of the phase inversion system. By combining the advantages of both types, that is, expanding the limits, the ability to reproduce low frequencies is improved.

[0010]

However, the conventional passive radiator type Kelton type speaker device has the following problems.
As described above, it is very effective as a means for improving the low-frequency reproduction capability. However, the inside of the speaker box is divided into a front sealed chamber and a rear sealed chamber using a sub-baffle plate. There is a problem that the box structure becomes complicated due to the special structure.

Further, since the speaker unit, which is a vibration source, is fixed to the sub-baffle plate, there are problems that abnormal sound is generated due to unnecessary vibration of the sub-baffle plate, and that it is difficult to reduce the size of the speaker box due to its structure. .

The present invention solves the above-described problems in the conventional passive radiator type Kelton type speaker device, and directly attaches a speaker unit and a passive radiator diaphragm having an edge and a damper to a front baffle. The purpose of this method is to form a closed chamber on the front side of the loudspeaker, aiming for a simple structure that eliminates the need for a sub-baffle plate, which was conventionally indispensable. Another object is to reduce abnormal sounds.

[0013]

In order to solve this problem, a speaker device according to the present invention comprises a speaker unit to which an acoustic output signal of a power amplifier is connected, a passive radiator diaphragm to which an edge and a damper are attached, A front baffle for attaching the speaker unit and the passive radiator diaphragm to form a part of a speaker box; a cabinet forming a speaker box; and the speaker unit sealed by the speaker unit, the passive radiator diaphragm and the front baffle. A front closed chamber that couples the sound output of the back of the passive radiator diaphragm to the passive radiator diaphragm, and a back sealed chamber that is sealed by the speaker unit, the front baffle and the cabinet, and seals the sound output of the front of the speaker unit. Those arranged in a state close to inverted direction or upside down serial speaker unit with respect to the passive radiator diaphragm. In this speaker device, a front closed chamber is formed by directly attaching a speaker unit and a passive radiator diaphragm with an edge and a damper to the front baffle, eliminating the need for a sub-baffle plate that was conventionally indispensable. And a simple structure.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1 of the present invention provides a speaker unit to which an acoustic output signal of a power amplifier is connected, a passive radiator diaphragm to which an edge and a damper are attached, A front baffle to which the passive radiator diaphragm is attached and which forms a part of a speaker box; a cabinet which forms the speaker box; and a sound at the back of the speaker unit which is sealed by the speaker unit, the passive radiator diaphragm and the front baffle. A front closed chamber for coupling an output to the passive radiator diaphragm; and a rear closed chamber sealed by the speaker unit, the front baffle and the cabinet, and sealing the sound output on the front of the speaker unit. This is a speaker device that is arranged in the upside-down direction or near the upside-down direction with respect to the passive radiator diaphragm.The front sealed room is obtained by directly attaching the speaker unit and the passive radiator diaphragm with the edge and the damper to the front baffle. It can be formed, and the sub-baffle plate, which is conventionally indispensable, can be eliminated, and the structure of the speaker device can be simplified. In addition, the speaker device can be downsized by a simple structure, and the rigidity can be improved to reduce abnormal noise caused by unnecessary vibration.

According to a second aspect of the present invention, there is provided a speaker unit to which an acoustic output signal of a power amplifier is connected, a passive radiator diaphragm having an edge and a damper attached thereto, and a mounting of the speaker unit and the passive radiator diaphragm. A front baffle forming a part of the speaker box, a cabinet forming the speaker box, a front closed chamber for coupling the sound output on the back of the speaker unit to the passive radiator diaphragm, and a front baffle attached to the front of the front baffle. An auxiliary baffle that forms the front sealed chamber together with the speaker unit, the passive radiator diaphragm, and the front baffle; and an acoustic front surface of the speaker unit that is sealed by the speaker unit, the front baffle, and the cabinet. Comprising a back sealing chamber for sealing the force,
A speaker device in which the speaker unit is disposed in an upside down direction or near upside down with respect to the passive radiator diaphragm, wherein the speaker unit and a passive radiator diaphragm having an edge and a damper are directly attached to a front baffle, By attaching the auxiliary baffle, the front closed chamber can be formed, the sub-baffle plate, which was conventionally indispensable, can be eliminated, and the structure of the speaker device can be simplified. In addition, the speaker device can be downsized by a simple structure, and the rigidity can be improved to reduce abnormal noise caused by unnecessary vibration.

According to a third aspect of the present invention, there is provided a speaker unit to which an acoustic output signal of a power amplifier is connected, and a back-sealed type irregular frame in which an edge, a damper, and a diaphragm have openings in only one side direction. A passive radiator unit attached to the front panel, a front baffle forming the speaker unit and the passive radiator unit and forming a part of a speaker box, a cabinet forming a speaker box, the speaker unit, the passive radiator unit and the front. A front closed chamber that is sealed by a baffle and couples the sound output on the back of the speaker unit to the passive radiator unit; and a sealed room by the speaker unit, the passive radiator unit, the front baffle, and the cabinet. A speaker unit having a rear closed chamber for closing an acoustic output on a front surface of the speaker unit, wherein the speaker unit is arranged in an upside down direction or close to the upside down with respect to the passive radiator unit, wherein the speaker unit and the passive radiator are By directly attaching the unit to the front baffle, a front closed chamber can be formed, and a sub-baffle plate, which is conventionally indispensable, can be eliminated, and the structure of the speaker device can be simplified. In addition, the speaker device can be downsized by a simple structure, and the rigidity can be improved to reduce abnormal noise caused by unnecessary vibration.

The invention described in claim 4 is the first, second, and second inventions.
3. In the invention according to any one of the aspects 3, the passive radiator diaphragm includes a central portion covering the surface of the diaphragm, an outer peripheral portion supporting the diaphragm on a front baffle or a deformed frame, and a central portion of the surface of the diaphragm. And has an edge formed by integrally molding a thick portion provided in correspondence with the above, and has an effect of reducing generation of unnecessary middle and high frequency sounds caused by resonance of the passive radiator diaphragm.

According to a fifth aspect of the present invention, in the first aspect of the invention, an up-roll type edge is used as an edge of the passive radiator diaphragm. This has the effect of reducing the occurrence of abnormal noise caused by the high-speed movement of the air to lift the edge of the passive radiator.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the front portion of the front sealed room is provided with an opening portion for spatially connecting the speaker unit side and the passive radiator diaphragm side. The opening area of the opening of the baffle or the deformed frame of the passive radiator unit is configured to be 30% or more of the effective area of the diaphragm of the speaker unit, and the joint between the speaker unit and the passive radiator in the front closed chamber is provided. This has the effect of reducing the wind noise generated by the loudspeaker and reducing the abnormal sound of the speaker device.

According to a seventh aspect of the present invention, in the first aspect of the present invention, the front baffle at an opening portion spatially connecting the speaker unit side and the passive radiator diaphragm side of the front closed chamber. Alternatively, a curved surface for eliminating a sharp edge from the speaker unit side toward the passive radiator diaphragm side is provided on an inner peripheral edge of an opening portion of the deformed frame of the passive radiator unit, and a pulse having a sharp rising edge is provided. This has the effect of reducing abnormal sounds caused by instantaneous air movement from the speaker unit side of the front closed chamber to the passive radiator side, which is generated when a typical acoustic signal is input.

According to an eighth aspect of the present invention, in the first aspect of the present invention, a front baffle or a front baffle at an opening portion for spatially coupling the speaker unit and the passive radiator diaphragm in the front closed chamber is provided. In the vicinity of the opening of the deformed frame of the passive radiator unit, a semi-circular or semi-circular bridge-type holding portion for supporting the damper of the passive radiator diaphragm is integrally formed and provided. The front baffle or the passive radiator unit has an effect that the damper holding portion of the passive radiator can be integrated with the rear-sealed type irregular frame provided with an opening only in one direction on the side surface, and the speaker unit in the front sealed room. The opening area of the part connecting the passive radiator and the It has the effect that it can be.

According to a ninth aspect of the present invention, in the first aspect of the present invention, a diffuser is mounted at a position 5 to 20 mm above the passive radiator diaphragm of the front baffle, and the acoustic opening is formed. It is provided in the horizontal direction, and has an effect that sound reproduction can be performed without giving unnecessary vibration to the vehicle seat even when the speaker device is installed under the vehicle seat.

According to a tenth aspect of the present invention, in the invention according to any one of the first to third aspects, a radiating hole for the speaker unit is provided at a part of the front baffle where the upper part of the bottom plate of the speaker unit contacts. A sealing material is provided to prevent the air in the front enclosed room from leaking to the outside. Even in a small speaker device with poor speaker unit heat radiation conditions, the heat radiation characteristics can be improved without sacrificing acoustic characteristics, and the resistance of the speaker device can be improved. It has the effect of improving input performance.

[0024] According to an eleventh aspect of the present invention, there is provided a differential amplifier provided before a power amplifier, a microphone for detecting an acoustic output signal radiated from a speaker unit of a speaker device or a passive radiator diaphragm, and the microphone. A microphone amplifier for amplifying the detected signal, a power amplifying means for connecting an output signal of the microphone amplifier to the differential amplifier to perform acoustic feedback control, and a low-frequency speaker for reproducing an acoustic output signal of the power amplifying means Device, the low-frequency speaker device, the speaker unit to which the acoustic output signal of the power amplifier is connected, a passive radiator diaphragm attached with an edge and a damper, the speaker unit and the passive radiator diaphragm Front cover that forms part of the mounting speaker box A cabinet that forms a speaker box, a front closed chamber that is sealed by the speaker unit, the passive radiator diaphragm, and the front baffle, and couples an acoustic output on the back of the speaker unit to the passive radiator diaphragm. A speaker unit and a rear closed chamber that is sealed by the front baffle and the cabinet and seals a sound output on a front surface of the speaker unit, wherein the speaker unit is arranged in an upside down direction or close to upside down with respect to the passive radiator diaphragm. It has the effect of improving the rise and fall characteristics of the speaker device, which is a particular problem in the passive radiator type Kelton system, due to the servo effect of acoustic feedback control using a microphone. Sometimes, also has the action of suppressing a rise in Kuorite Lee factor becomes a problem when the speaker device is miniaturized.

According to a twelfth aspect of the present invention, there is provided a full-range speaker device to which an audio signal is applied and a low-frequency sound reproduction device.
A speaker unit to which the sound output signal of the power amplifier is connected, a passive radiator diaphragm having an edge and a damper attached thereto, and a front baffle forming a part of a speaker box having the speaker unit and the passive radiator diaphragm attached thereto. A cabinet forming a speaker box, a front closed chamber sealed by the speaker unit, the passive radiator diaphragm and the front back, and coupling an acoustic output on the back of the speaker unit to the passive radiator diaphragm,
The speaker unit is provided with a rear closed chamber that is sealed by the front baffle and the cabinet and seals an acoustic output on a front surface of the speaker unit, and the speaker unit is placed in an inverted direction or close to an inverted position with respect to the passive radiator diaphragm. Are placed,
And a sound reproduction device configured to add a sound signal having a phase opposite to that of the sound signal to the full-range speaker device. This has the effect that the phase relationship is optimized when the range speaker devices are combined.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG.

(Embodiment 1) FIG. 1 is an exploded perspective view of an audio reproducing apparatus according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 101 denotes a power amplifier for amplifying only a low-frequency signal of an audio input signal. Is a printed circuit board in which Reference numeral 102 denotes a speaker unit to which the sound output signal of the power amplifier 101 is connected. 103 is a passive radiator diaphragm to which an edge and a damper are attached. 104 is a speaker unit 102 and a passive radiator diaphragm 103
And a front baffle forming a part of the speaker box. 105 is a cabinet constituting a speaker box, and 106 is a speaker unit 102
And a front closed chamber in which the acoustic output on the back of the speaker unit 102 is sealed by the passive radiator diaphragm 103 and the front baffle 104 and is coupled to the passive radiator diaphragm 103. 107 is a speaker unit 10
2. A sealed back room that is sealed by the front baffle 104 and the cabinet 105 and seals the sound output at the front of the speaker unit 102. Speaker unit 102
Are arranged in an upside down direction or close to the upside down with respect to the passive radiator diaphragm 103 to constitute a passive radiator type Kelton type speaker device.

FIG. 2 is an exploded perspective view of a modification of the sound reproducing device according to the first embodiment of the present invention.
Is a printed circuit board incorporating a power amplifier for amplifying only the low frequency signal of the acoustic input signal. Reference numeral 202 denotes a speaker unit to which the sound output signal of the power amplifier 201 is connected. Reference numeral 203 denotes a passive radiator diaphragm to which an edge and a damper are attached. Reference numeral 204 denotes a front baffle to which the speaker unit 202 and the passive radiator diaphragm 203 are attached to form a part of a speaker box. Reference numeral 205 denotes a cabinet constituting a speaker box; 206, a front closed chamber for coupling an acoustic output on the back of the speaker unit 202 to a passive radiator diaphragm 203; 207, a cabinet mounted on the front of a front baffle 204; This is an auxiliary baffle that forms a front sealed chamber 206 together with the radiator diaphragm 203 and the front baffle 204.
Reference numeral 208 denotes the speaker unit 202 and the front baffle 2
The rear closed chamber is closed by the cabinet 04 and the cabinet 205 and seals the sound output on the front of the speaker unit 202. The speaker unit 202 is arranged in an upside down direction or near upside down with respect to the passive radiator diaphragm 203, and constitutes a passive radiator type Kelton type speaker device.

FIG. 3 is an exploded perspective view of a modification of the sound reproducing apparatus according to the first embodiment of the present invention.
Is a printed circuit board incorporating a power amplifier for amplifying only the low frequency signal of the acoustic input signal. Reference numeral 302 denotes a speaker unit to which the sound output signal of the power amplifier 301 is connected. Reference numeral 303 denotes an edge, a damper, and a diaphragm 1
This is a passive radiator unit attached to a back-sealed type irregularly shaped frame provided with an opening only in the direction. 3
Reference numeral 04 denotes a front baffle to which the speaker unit 302 and the passive radiator unit 303 are attached to form a part of a speaker box. Reference numeral 305 denotes a cabinet constituting a speaker box. Reference numeral 306 denotes a front closed chamber which is sealed by the speaker unit 302, the passive radiator unit 303, and the front baffle 304 and couples the sound output on the back of the speaker unit 302 to the passive radiator unit 303. 307 is a speaker unit 302 and a passive radiator unit 303
And a rear closed chamber that is closed by the front baffle 304 and the cabinet 305 to seal the sound output from the front of the speaker unit 302. The speaker unit 302 is disposed in an upside-down direction or near an upside-down direction with respect to the passive radiator unit 303, and forms a passive radiator-type Kelton type speaker device.

FIG. 4 shows a perspective view and a sectional view of a modification of the passive radiator diaphragm 103 to which the edge and the damper are attached in the sound reproducing apparatus according to the first embodiment of the present invention. In FIG. 4, reference numeral 401 denotes a passive radiator diaphragm, which corresponds to a central portion covering the surface of the diaphragm, an outer peripheral portion supporting the diaphragm on a front baffle or a deformed frame, and a central portion of the surface of the diaphragm. The edge 402 is formed by integrally molding a thick portion provided by the above. The edge 402 forms an up-roll type edge with respect to the passive radiator diaphragm.

FIG. 5 is a perspective view of the front baffle 104 in the sound reproducing device according to the first embodiment of the present invention.
In FIG. 5, reference numeral 501 denotes an opening that spatially connects the speaker unit 102 side of the front closed chamber 106 and the passive radiator diaphragm 103 side, and the opening area of this opening is the effective area of the diaphragm of the speaker unit 102. 3
It is set to 0% or more.

FIG. 6 also shows a perspective view of the front baffle 104 in the sound reproducing apparatus according to Embodiment 1 of the present invention, as viewed from the inside. In FIG. 6, the speaker unit 102 side of the front closed chamber 106 and the passive radiator diaphragm 103
The opening that spatially joins the sides has a speaker unit 102 on the inner peripheral edge of the opening of the front baffle 104.
A curved surface 601 for eliminating a sharp edge from the side toward the passive radiator diaphragm 103 is provided. A bridge-shaped holding portion 602 having a semicircular shape or a shape close to a semicircle for supporting a damper of the passive radiator diaphragm 103 is provided near the opening of the front baffle 104 by integral molding.

FIG. 7 is an exploded perspective view of a modification of the sound reproducing device according to the first embodiment of the present invention.
Is a diffuser attached to the front baffle 104, and the diffuser 701 is installed at a position 5 to 20 mm above the passive radiator diaphragm 103,
At the same time, by providing the acoustic opening in the horizontal direction, the acoustic output of the passive radiator diaphragm 103 is converted in the horizontal direction.

FIG. 8 is an exploded perspective view of a modification of the sound reproducing device according to the first embodiment of the present invention.
Denotes a bottom plate of the speaker unit 102. 8
Reference numeral 02 denotes a heat radiation hole for the speaker unit 102 provided on the front baffle 104 at a portion in contact with the bottom plate 801. Reference numeral 803 denotes a sealing material that prevents air in the front closed chamber 106 from leaking to the outside.

FIG. 9 is a block diagram of an electric circuit in a case where acoustic feedback control using a microphone is added to the sound reproducing apparatus according to the first embodiment of the present invention. In FIG.
Is an operation amplifier provided before the power amplifier 101. A microphone 902 detects an acoustic output radiated from the speaker unit 102 or the passive radiator diaphragm 103. 903 is a microphone 90
A microphone amplifier that amplifies the electric signal detected in Step 2, and connects the output signal of the microphone amplifier 903 to a differential amplifier 901 to perform a subtraction process and perform acoustic feedback control.

FIG. 10 is a system diagram when the sound reproducing device according to the first embodiment of the present invention is used as a sound reproducing device dedicated to low frequencies. In FIG. 10, reference numeral 1001 denotes the sound reproducing device according to the first embodiment, which is used as a low-frequency sound reproducing device. Reference numeral 1002 denotes a full-range speaker device for reproducing mainly in a middle and high range. Reference numeral 1003 denotes a sound source device, which includes a sound source device 1003a such as a compact disk player, a cassette tape player, and a tuner;
03b and a power amplifier 1003c.
Note that the sound signal connected to the sound reproduction device 1001 according to the first embodiment includes a sound signal having a phase opposite to that of the full-range speaker device 1002.

FIG. 11 compares the unnecessary vibration levels of the sound reproducing apparatus according to the first embodiment of the present invention and the conventional passive radiator type Kelton type speaker apparatus. 11
01 is an unnecessary vibration level in the front baffle 104 of the sound reproducing device according to the first embodiment. Reference numeral 1102 denotes an unnecessary vibration level in the front baffle 1203 of the conventional passive radiator type Kelton type sound reproducing device, and it is understood that the unnecessary vibration level itself is reduced.

The operation of the sound reproducing apparatus according to the first embodiment configured as described above and its modification will be described below.

In the sound reproducing apparatus according to the first embodiment shown in FIG. 1, only a low-frequency signal is taken out of a sound signal from a sound source device 1003 and the like by a power amplifier 101, and power amplification is performed. The acoustic signal whose power has been amplified by the power amplifier 101 is connected to the speaker unit 102 and converted into an acoustic output. The sound output from the back of the speaker unit 102 is transmitted to the passive radiator diaphragm 103 via air in the front closed chamber 106 sealed by the speaker unit 102, the passive radiator diaphragm 103 and the front baffle 104, and the passive radiator vibration Since the actual sound output can be obtained from the plate 103,
A simple structure that does not require a sub-baffle plate, which is indispensable in the past, can be provided. Further, the speaker device can be miniaturized by a simple structure that does not require the sub-baffle plate. FIG. 11 shows an unnecessary vibration level 11 in the front baffle 104 of the sound reproducing apparatus according to the first embodiment.
01 and an unnecessary vibration level 1102 in the front baffle 1203 of the conventional passive radiator type Kelton type sound reproducing apparatus. The conventional passive radiator type Kelton type sound reproducing apparatus has a sub baffle plate 12.
The unnecessary vibration of the front baffle 1203 is also large due to the unnecessary vibration of No. 06, but the sound reproducing apparatus of the first embodiment which does not require the sub-baffle plate has high rigidity, and the unnecessary vibration level of the front baffle 104 is extremely small. Abnormal sounds have been greatly reduced.

The acoustic output on the front of the speaker unit 102 is sealed by the rear sealed chamber 107 sealed by the speaker unit 102, the front baffle 104 and the cabinet 105, and the acoustic output on the front of the speaker unit 102 is changed to the passive radiator diaphragm 103. To prevent interference with the sound output of the

Next, FIG. 2 will be described. Sound source device 1
From the acoustic signal from 003 or the like, only a low-frequency signal is extracted by the power amplifier 201 and power-amplified. The acoustic signal power-amplified by the power amplifier 201 is connected to the speaker unit 202 and converted into an acoustic output. The acoustic output on the back of the speaker unit 202 is transmitted to the passive radiator diaphragm 203 via the air in the front closed chamber 206 closed by the speaker unit 202, the passive radiator diaphragm 203, the auxiliary baffle 207 and the front baffle 204. Since an actual sound output can be obtained from the passive radiator diaphragm 203, a simple structure that does not require a sub-baffle plate, which is conventionally indispensable, can be obtained. In addition, an abnormal sound caused by unnecessary vibration can be reduced by reducing the size and improving the rigidity of the speaker device by simplifying the structure without using the sub-baffle plate. The acoustic output on the front of the speaker unit 202 is sealed by the rear sealed chamber 208 sealed by the speaker unit 202, the front baffle 204 and the cabinet 205, and the acoustic output on the front of the speaker unit 202 is the acoustic output of the passive radiator diaphragm 203. To avoid interference.

Next, FIG. 3 will be described. Sound source device 1
From the acoustic signal from 003 or the like, only a low-frequency signal is extracted by the power amplifier 301 and power-amplified. The acoustic signal power-amplified by the power amplifier 301 is connected to the speaker unit 302 and converted into a sound output. The acoustic output on the back side of the speaker unit 302 is a front closed chamber 3 closed only by the speaker unit 302, the passive radiator unit 303, and the front baffle 304.
Radiator unit 30 through the air in 06
3, and the actual sound output can be obtained from the passive radiator unit 303. Therefore, a simple structure that does not require a sub-baffle plate, which is conventionally indispensable, can be obtained. In addition, an abnormal sound caused by unnecessary vibration can be reduced by reducing the size and improving the rigidity of the speaker device by simplifying the structure without using the sub-baffle plate.

The rear closed chamber 30 closed by the speaker unit 302, the passive radiator unit 303, the front baffle 304, and the cabinet 205.
7, the sound output on the front of the speaker unit 302 is sealed so that the sound output on the front of the speaker unit 302 does not interfere with the sound output of the passive radiator unit 303.

Next, FIG. 4 will be described. Edge 40
Reference numeral 2 denotes a central portion that covers the surface of the passive radiator diaphragm 401, an outer peripheral portion that supports the passive radiator diaphragm 401 on the front baffle 104, and a thickness provided corresponding to the center of the surface of the passive radiator diaphragm 401. This structure is used to integrally mold the unit and the unit, and it is possible to reduce the generation of unnecessary middle and high pitch sounds caused by the resonance of the passive radiator diaphragm 401 and the like. Also, the edge 402 has a configuration using an up-roll type,
Due to the high speed movement of air in the front closed chamber 106, the edge 40
2 can be suppressed and the generation of abnormal noise can be reduced.

Next, FIG. 5 will be described. In the front closed chamber 106, the opening area of the opening portion 501 that spatially couples the speaker unit 102 and the passive radiator diaphragm 103 to 30% or more of the effective area of the diaphragm of the speaker unit 102. Opening part 5
01 is reduced, and abnormal sound of the speaker device can be reduced.

Next, FIG. 6 will be described. A curved surface 601 for eliminating a sharp edge from the speaker unit 102 side to the passive radiator diaphragm 103 side is attached to the inner peripheral edge of the opening portion 501 of the front baffle 104, and a pulse-like acoustic signal with a sharp rise is input. It is possible to reduce abnormal noise caused by instantaneous movement of air from the speaker unit 102 side of the front closed chamber 106 to the passive radiator 103 diaphragm side, which is generated at the time of the occurrence. In addition, near the opening 501 of the front baffle 104, the passive radiator diaphragm 103
It is possible to integrally form and provide a bridge-shaped holding portion 602 having a semicircular shape or a shape close to a semicircle for supporting the damper described above, and at the same time, a sufficient opening area of the opening portion 501 can be secured.

Next, FIG. 7 will be described. By installing the diffuser 701 at a position 5 to 20 mm above the passive radiator diaphragm 103 and providing an acoustic opening in the horizontal direction, the acoustic output of the passive radiator diaphragm 103 can be converted to the horizontal direction, and the speaker device can be installed under the vehicle seat. Even in the case where the vehicle seat is installed, sound reproduction can be performed without giving unnecessary vibration to the vehicle seat.

Next, FIG. 8 will be described. A radiator hole 802 for the speaker unit 102 and a seal member 803 for preventing air in the front closed chamber 106 from leaking outside are provided in the front baffle 104 above the bottom plate 801 of the speaker unit 102. Even in a small speaker device having poor heat radiation conditions of 102, the heat radiation characteristics can be improved without sacrificing the acoustic characteristics, and the input resistance performance of the speaker device can be improved.

Next, FIG. 9 will be described. Sound source device 1
Amplification of acoustic input signals such as 003 and acoustic feedback control for correcting acoustic output signals actually radiated from the speaker unit 102 or the passive radiator diaphragm 103 of the speaker device using the microphone 902 by the differential amplifier 901. Combination of means to improve the rise and fall characteristics of the speaker device, which is a particular problem in the passive radiator type Kelton system, by the servo effect, and at the same time, suppress the increase in the quality factor due to the miniaturization of the speaker device. it can.

Finally, FIG. 10 will be described. Sound source device 10 including a sound source device 1003a such as a compact disk player, a cassette player, and a tuner, a voltage amplifier 1003b, and a power amplifier 1003c.
This is a combination of the full-range loudspeaker device 1002 that receives the audio signal from the third audio signal 03 and reproduces mainly in the middle and high ranges, and the low-range sound reproduction device 1001 with the sound reproduction device of the first embodiment.
The sound reproducing apparatus according to the first embodiment has a structure in which a sound signal having a phase opposite to that of the sound signal applied to the second audio signal is added to the full-range loudspeaker apparatus 1002 so that the sound output has an opposite phase in terms of structure. 1001 can be optimized.

[0051]

As described above, according to the present invention, in the passive radiator type Kelton type loudspeaker apparatus, the loudspeaker unit and the passive radiator diaphragm to which the edge and the damper are attached are directly attached to the front baffle to thereby provide a front surface. Form a closed chamber, or directly attach a speaker unit and a passive radiator diaphragm with an edge and a damper to the front baffle,
The front baffle can be formed by attaching the auxiliary baffle, or the front baffle can be formed by directly attaching the speaker unit and the passive radiator unit to the front baffle. A simple structure that does not require a plate can be realized. At the same time, there is an advantageous effect that abnormal sound caused by unnecessary vibration can be reduced by reducing the size and improving the rigidity of the speaker device due to the simple structure.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a sound reproducing device according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a modification of the sound reproducing device of the first embodiment.

FIG. 3 is an exploded perspective view showing a modification of the sound reproducing device of the first embodiment.

FIG. 4A is a perspective view of a modified example of the passive radiator diaphragm in the sound reproducing device according to the first embodiment; FIG.

FIG. 5 is a perspective view of a front baffle in the sound reproducing device according to the first embodiment;

FIG. 6 is a perspective view of the front baffle as viewed from inside in the sound reproducing device according to the first embodiment;

FIG. 7 is an exploded perspective view showing a modified example of the sound reproducing device of the first embodiment.

FIG. 8 is an exploded perspective view showing a modification of the sound reproducing device of the first embodiment.

FIG. 9 is a block diagram of an electric circuit in a case where acoustic feedback control using a microphone is added to the sound reproducing device according to the first embodiment;

FIG. 10 is a system diagram in a case where the sound reproducing device according to the first embodiment is used as a sound reproducing device dedicated to low frequencies.

FIGS. 11A and 11B are comparison characteristic diagrams of an unnecessary vibration level between the sound reproducing device according to the first embodiment and a conventional passive radiator type Kelton type speaker device;

FIG. 12 is an exploded perspective view showing a conventional passive radiator type Kelton type speaker device.

FIG. 13 is a comparison diagram of low-frequency reproduction characteristics of the speaker device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 Power amplifier 102 Speaker unit 103 Passive radiator diaphragm 104 Front baffle 105 Cabinet 106 Front sealed room 107 Back sealed room 201 Power amplifier 202 Speaker unit 203 Passive radiator diaphragm 204 Front baffle 205 Cabinet 206 Front sealed room 207 Auxiliary baffle 208 Back sealed Room 301 Power amplifier 302 Speaker unit 303 Passive radiator unit 304 Front baffle 305 Cabinet 306 Front sealed room 307 Back sealed room 401 Passive radiator diaphragm 402 Up roll edge 501 Opening of front sealed room 601 Curved surface 602 Bridge type damper holding portion 701 Diffuser 801 Bottom plate of speaker unit 802 Netsuana 803 sealant 901 differential amplifier 902 microphone 903 acoustic reproducing apparatus 1002 full range of the amplifier 1001 according to the first embodiment of the microphone loudspeaker 1003 tone generator 1003a sound module 1003b voltage amplifier 1003c power amplifier

Claims (12)

[Claims] 1. A speaker unit to which a sound output signal of a power amplifier is connected, a passive radiator diaphragm to which an edge and a damper are attached, and a part of a speaker box to which the speaker unit and the passive radiator diaphragm are attached. A front baffle, a cabinet forming a speaker box, and a front closed chamber that is sealed by the speaker unit, the passive radiator diaphragm and the front baffle, and couples an acoustic output on a back surface of the speaker unit to the passive radiator diaphragm. A rear closed chamber that is sealed by the speaker unit, the front baffle and the cabinet, and seals a sound output on a front surface of the speaker unit, wherein the speaker unit is inverted with respect to the passive radiator diaphragm. A speaker device arranged in a state that is close to the upside down or upside down. 2. A speaker unit to which a sound output signal of a power amplifier is connected, a passive radiator diaphragm to which an edge and a damper are attached, and a part of a speaker box to which the speaker unit and the passive radiator diaphragm are attached. A front baffle, a cabinet forming a speaker box, a front closed chamber for coupling an acoustic output on a back surface of the speaker unit to the passive radiator diaphragm, and a front unit mounted on a front surface of the front baffle, the speaker unit and the passive radiator vibration. An auxiliary baffle forming the front closed chamber together with a plate and the front baffle; and a rear closed chamber sealed by the speaker unit, the front baffle and the cabinet, and closing an acoustic output at the front of the speaker unit. And a speaker device in which the speaker unit is disposed in an upside-down direction or near an upside-down state with respect to the passive radiator diaphragm. 3. A loudspeaker unit to which an acoustic output signal of a power amplifier is connected, and a passive radiator unit having an edge, a damper, and a diaphragm attached to a back-sealed type irregular frame provided with an opening only in one side direction. When,
A front baffle that mounts the speaker unit and the passive radiator unit to form a part of a speaker box; a cabinet that forms the speaker box; and a back surface of the speaker unit that is sealed by the speaker unit, the passive radiator unit, and the front baffle. A front closed chamber that couples the acoustic output of the speaker unit to the passive radiator unit, and a back closed chamber that is sealed by the speaker unit, the passive radiator unit, the front baffle and the cabinet, and seals the acoustic output of the front of the speaker unit. And a speaker device in which the speaker unit is arranged in an upside down direction or near upside down with respect to the passive radiator unit. 4. A passive radiator diaphragm is provided corresponding to a central portion covering the surface of the diaphragm, an outer peripheral portion supporting the diaphragm on a front baffle or a deformed frame, and a central portion of the surface of the diaphragm. 4. The speaker device according to claim 1, wherein the speaker device has an edge formed by integrally molding the thick portion. 5. The speaker device according to claim 1, wherein an up-roll type edge is used as an edge of the passive radiator diaphragm. 6. An opening area of a front baffle or a modified frame of a passive radiator unit at an opening portion spatially connecting a speaker unit side and a passive radiator diaphragm side of a front closed chamber to the vibration area of the speaker unit. 4. The loudspeaker device according to claim 1, wherein the effective area of the loudspeaker is 30% or more. 7. An opening portion for spatially connecting the speaker unit side and the passive radiator diaphragm side of the front closed chamber to an inner peripheral edge of an opening portion of a front baffle or a modified frame of the passive radiator unit, wherein the speaker unit side is provided. 4. The speaker device according to claim 1, further comprising a curved surface for eliminating sharp edges from a direction toward the passive radiator diaphragm side. 8. A passive radiator diaphragm damper is supported near an opening of a front baffle or an irregularly shaped frame of the passive radiator unit at an opening part of the front closed chamber that spatially couples the speaker unit and the passive radiator diaphragm. 4. The speaker device according to claim 1, wherein a semi-circular or semi-circular bridge-shaped holding portion is integrally formed and provided. 9. A diffuser is mounted at a position 5 to 20 mm above a passive radiator diaphragm of a front baffle, and an acoustic opening is provided in a horizontal direction.
The speaker device according to any one of the above. 10. A radiator hole for the speaker unit and a seal member for preventing air in the front closed chamber from leaking to the outside at a portion of the front baffle where an upper portion of a bottom plate of the speaker unit contacts. , 2,3
The speaker device according to any one of the above. 11. A differential amplifier provided before a power amplifier, a microphone for detecting an acoustic output signal radiated from a speaker unit or a passive radiator diaphragm of a speaker device, and a microphone for amplifying a signal detected by the microphone. An amplifier; a power amplifying means for connecting an output signal of the microphone amplifier to the differential amplifier to perform acoustic feedback control; and a low-frequency speaker device for reproducing an acoustic output signal of the power amplifying means. The area speaker device includes a speaker unit to which the sound output signal of the power amplifier is connected, a passive radiator diaphragm to which an edge and a damper are attached, a part of the speaker box to which the speaker unit and the passive radiator diaphragm are attached. Forming front baffle and speaker box A front closed chamber that is sealed by the speaker unit, the passive radiator diaphragm, and the front baffle and couples an acoustic output on the back of the speaker unit to the passive radiator diaphragm, and the speaker unit and the front. A rear closed chamber that is closed by a baffle and the cabinet and seals an acoustic output on a front surface of the speaker unit, wherein the speaker unit is arranged in an upside down direction or close to upside down with respect to the passive radiator diaphragm. A sound reproducing device characterized by the above-mentioned. 12. A low-range sound reproduction device including a full-range speaker device to which an audio signal is added, the low-frequency sound reproduction device includes a speaker unit to which a sound output signal of a power amplifier is connected; A passive radiator diaphragm to which an edge and a damper are attached; a front baffle to which the speaker unit and the passive radiator diaphragm are attached to form a part of a speaker box; a cabinet forming a speaker box; the speaker unit and the passive unit A front closed chamber that is hermetically sealed by the radiator diaphragm and the front back, and couples an acoustic output on the back of the speaker unit to the passive radiator diaphragm; a speaker unit that is sealed by the speaker unit, the front baffle, and the cabinet; A rear closed chamber for closing the sound output on the front of the knit is provided, wherein the speaker unit is arranged in an inverted direction or nearly inverted with respect to the passive radiator diaphragm, and an acoustic signal to the full-range speaker device. Is an audio reproducing device configured to add audio signals having an opposite phase relationship.