JPH1141685A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reinforce a radiating power at a low-frequency sound by adding the radiating power of an electric vibration transducer to the radiating power of a speaker unit in a cabinet. SOLUTION: In a speaker unit A that supplies an acoustic signal of opposite phase to input terminals TA and TB, a force F operates in an arrow direction and, similarly, a force F' operates in an exciter B in the arrow direction. For example, when it is designed that the speaker unit A is given a driving force of a force 2F, if the exciter B is made to be given the driving force of a force 2F', these driving forces are added and 2F+2F'=4F(F=F') is obtained. With such constitution, in the cabinet 21, which is small-sized, lightweight and has a fixation part 29 fixed, the radiating power of a sound of the speaker unit can be made very strong and, especially, the radiating power of the low-frequency sound can be augmented and improvement of a sound quality of a speaker device is enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small and lightweight speaker device having a small speaker unit and an electric / vibration transducer built in a cabinet or the like.

[0002]

2. Description of the Related Art Conventionally, in order to suppress vibration of a baffle board of a cabinet in which a speaker unit is mounted, a vibrator or a vibrator that vibrates in a direction opposite to a vibration direction of a speaker vibrated by a diaphragm. A speaker device having an electric / vibration transducer is disclosed in, for example,
These are known in detail in Japanese Patent Application Laid-Open No. 212000, Japanese Patent Application Laid-Open No. 1-307398, and the like.

The above-mentioned Japanese Patent Application Laid-Open No. 62-212000 discloses a speaker device as shown in FIG. FIG.
Numeral 7 designates a ring-shaped magnet 1 and numerals 2 and 3 designate a plate and a yoke which are attached so as to sandwich the magnet 1 and partially have a magnetic gap 4 formed therein. A frame 5 of the speaker unit A is attached to the plate 2, and an edge 6 is provided on an outer peripheral portion of the frame 5. The edge 6 holds an outer peripheral portion of a cone-shaped diaphragm 7.

On the other hand, a voice coil bobbin 8 is mounted on an inner peripheral portion of the diaphragm 7, and a voice coil 9 is wound around the bobbin 8, and the voice coil 9 is formed by a magnetic plate formed by the plate 2 and the yoke 3. It is inserted into the gap 4.

The structures indicated by the reference numerals 1 to 9 are the basic structure of a well-known electrodynamic speaker unit A.

One end of a screw 10 is screwed into the center of the back surface of the yoke 3 of the speaker unit A. The other end of the screw 10 is completely connected to the magnet 1, plate 2 and yoke 3 of the speaker unit A. A magnetic circuit including the magnet 11, the plate 12, and the yoke 13 having the same configuration is mounted.

A frame 14 is mounted on the plate 12, and two dampers 15, 16 are mounted on the frame 14.
The drive coil bobbin 17 is held by 5 and 16.

A drive coil 18 is wound around one end of the drive coil bobbin 17, and the drive coil 18 is provided in the magnetic gap 1 formed by the plate 12 and the yoke 13.
9 is inserted. A weight 20 is attached to the other end of the drive coil bobbin 17, and the vibration system including the weight 20 is substantially equal to the inertial mass of the vibration system including the cone-shaped diaphragm 7 in the speaker unit A. Has been established. The configurations indicated by the reference numerals 11 to 20 indicate the electric / vibration transducer B.

In the above configuration, the speaker unit A and the electric / vibration transducer B are mounted on the baffle board 22 of the cabinet 21. Now, when an electric signal is applied to the voice coil 9 of the speaker unit A, the voice coil 9 vibrates in the left-right direction in the figure by a well-known operation, and drives the cone-shaped diaphragm 7 to reproduce sound.

At this time, the electric / vibration transducer B
When the same electric signal is also applied to the drive coil 18 in the above, the drive coil 18 also vibrates in the left-right direction in the figure and drives the weight 20 in the same direction. Here, if the inertial masses of the vibration system including the diaphragm 7 and the like in the speaker unit A and the vibration system including the weight 20 and the like in the electric / vibration transducer B are substantially equal, the reaction that the speaker unit A receives by the vibration system and the electric and vibration The reaction of the vibration system in the transducer B becomes substantially equal.

Therefore, the reaction that the speaker unit A receives by driving the diaphragm 7 is canceled by the electric / vibration transducer B, and the vibration of the baffle board 22 of the cabinet 21 is suppressed.

On the other hand, there is a demand to obtain an inexpensive speaker system by reducing the volume of the cabinet 21 and miniaturizing it.
As the volume of the speaker is reduced, the amplitude of the speaker unit A is increased so as to suppress an increase in the low-frequency reproduction limit.

However, by increasing the amplitude of a small speaker, the sound pressure in the cabinet 21 increases, and peaks and valleys occur in the frequency characteristics. As a method of solving such a problem, a speaker device which uses a phase inversion type bass reflex cabinet to effectively utilize sound waves emitted from the back surface of the diaphragm to radiate a low frequency range without distortion is widely used. ing.

[0014]

If the size of the cabinet 21 is reduced by reducing the size of the speaker unit and the speaker device, and the cabinet 21 is made lighter with plastic or the like, the speaker device as shown in FIG. The back surface of the cabinet 21 swings due to the sound pressure P radiated from the back surface of the damper 16 of the vibration transducer B and the diaphragm 7 of the speaker unit A.

Since the sound pressure in the cabinet 21 rises in inverse proportion to the volume of the cabinet 21, the cabinet 2
If the volume inside 1 is reduced and the sound pressure is increased, the back surface of the cabinet 21 vibrates at a specific frequency, and when the resonance frequency is reached, the entire cabinet 21 is shaken, swings, moves the cabinet, However, there is a problem that the sound quality of the low-frequency sound is degraded and a complicated peak and valley is generated in the low-frequency reproduced sound. In order to solve such a problem, in a configuration for suppressing the vibration of the baffle board 22 as shown in FIG. 17, the baffle board 22 and the cabinet 21 are integrated, and a reaction of the driving force F of the diaphragm of the speaker unit is performed. Can be counteracted by the reaction of the driving force -F of the vibration transducer B in the opposite direction.

However, the small and light cabinet 21 is not necessarily provided on the floor or on a desk or the like. The cabinet 21 is fixed on a sufficiently heavy mounting table or the cabinet 21 is fixed on a fixed portion such as a wall or a floor. Is fixed, the above-mentioned worries are eliminated.

In the case described above, the present invention provides a speaker device in which the above-described electric and vibration transducers B are added to the speaker unit A by adding the driving force thereof, and in particular, the radiation force in the low frequency range is enhanced. It is what we are trying to get.

[0018]

According to the speaker device of the present invention, an electric / vibration transducer B for adding the radiation force of a speaker unit A mounted in a cabinet 21 fixed to a fixed portion is disposed in the cabinet. It consists of.

According to the present invention, the radiating power of the electric and vibration transducers is added to the radiating power of the speaker unit A, and a loudspeaker device having a strong radiating power at low frequencies can be obtained.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A speaker device according to the present invention will be described below with reference to FIGS. FIG. 1 shows a configuration diagram of an example of the present invention. A speaker unit A is provided in a speaker mounting hole 24 formed above a baffle board 22 fixed to the front of a small and light cabinet 21 made of synthetic resin or the like. The second magnetic circuit 27 of an electric / vibration transducer or a vibrator (hereinafter, referred to as a vibrator) B, which will be described later, is provided on the back of the magnet 1 of the first magnetic circuit 25 constituting the speaker unit A. And the speaker unit A and the vibrator B are integrated so that their diaphragms 7A and 7B face in opposite directions to constitute a speaker device.

The magnets 1 and 33 of the first and second magnetic circuits 25 and 27 of the speaker unit A and the vibrator B
The lower yokes 3 and 34 (to be described later) are fixed to each other via an adhesive, or the magnet 1 or 33 is joined to one of the yokes 3 or 34 via an adhesive as shown in FIG. It has been made to.

The cabinet 21 of this embodiment reverses the phases of the sound output from the back of the speaker unit A and the sound pressure from the vibration exciter B on the same plane as the speaker mounting hole 24 of the baffle board 22 so that the cabinet 21 An opening for radiating outside and a duct 23 are formed to form a phase inversion type bass reflex cabinet, and the bottom surface of the cabinet 21 is fixed to a fixing portion 29 such as a floor or a wall.

Furthermore, speaker units A sound signal is supplied via an amplifier to an input terminal T _A which is attached to the back plate 21b of the cabinet 21, the vibrator input terminal T _A from the input terminal T _B to B The same electrical signal as the acoustic signal to be supplied is supplied via a phase inversion circuit and an amplifier.
As will be described later, the speaker device of this example is a speaker unit A
1 and a speaker unit A as shown in FIG. 4 and FIG.
When the exciter B and the exciter B are back to back, an electric signal in the opposite direction is supplied. As shown in FIG. 6 described later, the speaker unit A and the diaphragms 7A and 7B of the exciter B are in the same direction. In this case, electric signals having the same phase may be supplied.

In the configuration of FIG. 1 described above, if sound signals having phases opposite to each other are supplied to the input terminals T _A and T _B , the force of F = m ₀ α _{0 in} the speaker unit A will be represented by the arrow in FIG. Similarly, a force of F ′ = m _k α _k acts on the exciter B, where m ₀ and m _k are equivalent masses of the speaker unit A and the exciter B, α ₀ and α _k Is the speaker unit A
And accelerations of diaphragms 7A and 7B of exciter B.

As described above, the speaker unit A and the vibrator B
Is driven, the force in the F 'direction acts on the vibrator B similarly to the force in the F direction of the speaker unit A.

For example, if the loudspeaker unit A is designed to be given a driving force of 2F, and the exciter B is designed to be given a driving force of 2F ', these driving forces are added in the configuration of FIG. 2F + 2F '= 4F (where F =
F ′).

In general, the force F = m ₀ α ₀ applied to diaphragms 7 A and 7 B in the case of a dynamic speaker is expressed by the following equation (1).
Is determined by

[0028]

(Equation 1)

Here, WE is an audio signal input applied to the speaker unit A or the vibrator B, Bg is the magnetic flux density of the gap of the magnetic circuit, Vv is the effective volume of the voice coil, δ is the specific resistance of the material of the voice coil, Q is speaker unit A
Alternatively, it is the resonance sharpness of the exciter B, and the aforementioned WE, Bg,
Vv, [delta], the power of speaker units A and vibrator B is added together with appropriately selecting the Q or m _0, m _k F +
F ′ can be selected under various conditions.

With such a configuration, in the cabinet 21 which is small and lightweight and has a fixed fixing portion, the radiating power of the sound of the speaker unit can be greatly increased. The sound quality of the device is improved.

In this embodiment, the speaker unit A and the adder B in the cabinet 21 are selectively used depending on whether the cabinet 21 of the speaker device is in the free state or the cabinet 21 is fixed to the fixing portion 29. Becomes possible.

When the cabinet 21 and the baffle board 22 formed in a box shape are formed as a single unit, and the cabinet 21 is disposed in a free state on a desk or the like, the switch 21 and the like are not shown. When the same electric signals to be supplied to the speaker unit A and the vibrator B are supplied so as to have the same phase, the vibrator B and the speaker unit A are mutually connected in the configuration of FIG. The cabinet 21 receives a force in the F direction of the speaker unit A in the left direction in FIG. In FIG. 1, the cabinet 21 receives a driving force of −F, which is opposite to that of FIG.
Is determined by the difference between F and -F, and if the driving force F and the driving force -F are equal, they cancel each other and the cabinet 21 can be prevented from swinging.

On the other hand, when the cabinet 21 of the speaker device is fixed to the fixing portion 29, one of the phases of the electric signals supplied to the speaker unit A and the vibrator B is reversed through a switch (not shown). The driving forces F and F ′ of the vibrator B and the speaker unit A are added to each other, and not only strongly produce the low-frequency radiation force from the speaker unit A, but also
Since the mass of the vibration system of the speaker unit A does not increase in the middle and high ranges, a speaker device that can emit good sound can be obtained.

FIG. 17 shows a speaker unit A of FIG.
The same general small loudspeaker unit A as that used in (1) can be used. A vibrator B, which will be described later with reference to FIGS. 2 and 3, is fixed to the back of the speaker unit A such that the diaphragm 7A of the speaker unit A and the diaphragms 7A and 7B of the vibrator B face in opposite directions.

An example of the configuration of the vibrator B used in the present invention will be described with reference to FIGS. In FIG. 2, the vibrator B of this embodiment is made of a disk-shaped plate material, and has a columnar center pole 34a planted in the center and a step portion formed concentrically so as to surround the center pole 34a. Yoke 3 having an inverted T-shaped cross section with integrated magnet guide 34b
4, a ring-shaped magnet 33 whose inner diameter is fitted and joined to the magnet guide 34b of the yoke 34, and which is magnetized in the thickness direction in a ring shape, and a ring-shaped magnet 33 joined to the upper surface of the magnet 33 with an adhesive or the like. A plate 31 and a funnel-shaped frame 37 made of iron or the like fixed on the plate 31
Thus, the second magnetic circuit 27 of the metal part is configured.

The voice coil bobbin 3 is provided in a concentric magnetic gap 47 between the center pole 34a and the plate 31.
The voice coil bobbin 38 is inserted into the center pole 34a from above with a spacer such as kraft paper wound around the inner periphery of the voice coil bobbin 38 in order to insert the voice coil 38a wound around 8, and the position of the voice coil 38a is changed. The setting is made so as to be disposed in the magnetic gap 47.

A corrugated damper 39 having a corrugated shape is bonded between the outer diameter of the upper end of the voice coil bobbin 38 and the vicinity of the bottom surface of the frame 37 with an adhesive or the like.
The inner diameter of the diaphragm 7B formed with 8 is fitted and joined to the outer diameter of the upper end of the voice coil bobbin 38, and the maximum diameter of the diaphragm 7B is inserted into the maximum diameter opening of the frame 37 by the arrow paper 42.
To join.

After the adhesive is dried, the voice coil bobbin 38
Remove the spacer inserted into the inside diameter of the
Is bonded to the upper surface of the voice coil bobbin 38.

A lead wire is pulled out from the voice coil 38a, connected to an input terminal 45 via a tinsel wire 46, and an electric signal is supplied to the voice coil 38a via the input terminal 45. In the above description, the case where the magnet 33 magnetized in advance has been assembled is described. However, the magnet 33 not magnetized may be magnetized in the final assembly stage. In the speaker device having the configuration shown in FIG. 1, the vibrator B may be configured so that the magnetizing direction of the magnet of the speaker unit A and the winding direction of the voice coil 38 a are wound in the same direction.

FIG. 3 shows another example of the configuration of the vibrator according to the present invention. The same reference numerals are given to the parts corresponding to those in FIG.

In FIG. 3, the structure up to the magnetic circuit and the air-permeable lower damper 39a is the same as that of FIG. 2, but the upper outer diameter of the voice coil bobbin 38 and the ring-shaped wavy upper damper 39b are shown.
A weight 49 is disposed on the upper damper 39b so as to add an equivalent mass so as to surround the voice coil so as to surround the voice coil, and the maximum outer diameter opening of the frame 37 and the voice coil bobbin 38
Upper damper 39 formed of cloth or the like between outer diameter portions of
b is provided. The outer diameter portion of the upper damper 39b is fixed to the frame 37 via the arrow paper 42, and connected between the upper damper 39b and the input terminal 37 via the tinsel wire 46.
And the voice coil 38a are connected. In this configuration, the upper damper 39b forms the diaphragm 7B, but does not emit sound. Also, a material having good air permeability, such as cloth, is selected for the cap 44 to be covered on the upper surface of the voice coil bobbin 38.

In the speaker device of FIG. 1 described above, the magnet 1 forming the first magnetic circuit 25 of the speaker unit A is used.
The upper side (diaphragm side) of the magnet B has an N pole, the lower side (back side) has an S pole, the lower side of the magnet 1 has an S pole having the same polarity, and the other side has an N pole. Since the magnet 33 of the circuit 27 is joined to the yoke 3 of the speaker unit A, the magnets 1 and 33 exhibit a canceling effect, and the external leakage magnetic flux is greatly suppressed by the two magnets 1 and 33. The effective magnetic flux of the air gap 9 can be increased by about 30% as compared with the case where one magnet 1 is used, and the driving force can be increased even with a small speaker unit A. It became like.

The speaker device shown in FIGS. 4 to 6 shows another configuration of the present invention, and a vibrator having the configuration shown in FIG. 2 or 3 is used as the vibrator B. FIG. 4 shows an electrodynamic speaker unit A similar to that described with reference to FIG. 17 with the disc-shaped yoke 34 of the vibrator B described with reference to FIG. The pole piece 34a is erected on the bottom surface of the yoke 3 of the speaker unit A via an adhesive or a screw, and the ring-shaped magnet 33 is joined to the bottom surface of the yoke 3 to form the first and second magnetic circuits 25 and 27. Magnets 1 and 33 are joined back to back so that different poles face each other.

4, the resonance sharpness Q at the lowest resonance frequency f ₀ of the vibrator B is designed to be larger than that of the speaker unit A. For example, the impedance of the voice coil 9 of the speaker unit A is set to 8Ω, Is set to 5 W and the exciter B
If the impedance of the voice coil 38a is set to 38Ω, the power is 1.25 W, and the power can be significantly reduced.

Therefore, a thin wire can be used for the voice coil of the vibrator B, so that the effective coil length can be made sufficiently long. Therefore, even if the second magnetic circuit 27 is miniaturized, the speaker unit A is strong. A loudspeaker device capable of adding radiation power is obtained.

[0046] Further, since it supplies by dividing the electrical signal supplied from the input terminal T _A which is arranged on the back plate of the cabinet 21 to the vibrator B and speaker unit A through the amplifier, as shown in FIG. 4 Input terminal 61 of speaker unit A
And the input terminal 45 of the exciter B are directly connected by a wire, so that an electric signal can be supplied to the speaker unit A and the exciter B via one amplifier.

In the case of FIG. 4, the magnetizing direction of the magnet of the first magnetic circuit 25 is reversed to the magnetizing direction of the magnet 33 of the vibrator B, or the winding direction of one voice coil is reversed. The radiation forces F and F 'of the exciter B and the speaker unit A are added in the direction. Of course, the magnetization direction may be the same in the vibrator B and the speaker unit A as shown in FIG. 1, and a phase inversion circuit may be inserted between the input terminals 61 and 45.

FIGS. 5 and 6 show still another configuration of the speaker device according to the present invention. FIG. 5 shows a general small speaker similar to that described with reference to FIG. The unit A and the shaker B described in FIG. 2 are used,
The vibration exciter B is attached to the rear plate 21b of the cabinet 21 so that the diaphragms 7A and 7B face in opposite directions so that the rear surface of the speaker unit A and the rear surface of the vibration exciter B face each other. Of course, the exciter B is a speaker cabinet 21
The opening of the vibration plate 7B is directed to the back plate 21b or the opening of the vibration wave 7B is directed to the baffle board 22 via an L-shaped vibrator mounting plate attached to the top plate or the left and right side plates. The speaker unit A can be disposed so as to face the speaker unit A as described above. Also in this case, the driving can be performed so that the radiation forces of the exciter B and the speaker unit A are added.

The structure shown in FIG. 6 fixes the general small speaker unit A shown in FIG. 17 on the inner surface of the mounting hole 24 formed in the baffle board 22 of the cabinet 21 and also shows the structure shown in FIG.
And the vibrator B shown in FIG. 3 is fixed to the inner surface of the baffle board 22 above the speaker unit A, and the duct 23 and the opening constituting the bass flex cabinet in this case are the rear plate 21b or the left and right side plates. Provided on the side. The arrangement position of this duct 23 is the speaker unit A
The sound wave from the back of the speaker unit A and the shaker B can be used effectively by arranging it at the back position between the shaker B and the shaker B, and the lower sound range can be radiated with a large radiation force without distortion. Becomes

In the speaker unit A and the vibrator B described with reference to FIGS. 5 and 6, the magnetizing direction, the winding direction of the voice coil, the presence / absence of the phase inversion circuit, and the like are determined by the vibration of the speaker unit A and the vibrator B. It can be appropriately selected depending on the direction of the openings of the plates 7A and 7B. It is apparent that the direction of the current flowing through the vibrator B and the direction of the current flowing through the voice coil of the speaker unit A may be selected so as to be mutually added.

FIG. 7 shows another cross-sectional view of the speaker device of the present invention. In the configuration of FIG.
And a speaker unit 50 having a vibrator integrated with the vibrator B and disposed in a speaker mounting hole 24 formed in a baffle board 22 of a bass reflex cabinet 21 in which a speaker unit 50 with a vibrator is fixed to a fixing part 29. The radiating force of the vibrator B is added to the radiating force of the diaphragm of the speaker unit by the vibrator driving coil constituting the vibrator B, the damper and the diaphragm driven by the voice coil of the speaker unit A. Has been established.

The speaker unit C with a vibrator provided in the cabinet 21 of FIG. 7 will be described in detail with reference to FIG. FIG. 8 is a side sectional view taken along a diameter direction passing through the center of the opening when viewed from the plane of the small speaker. The yoke 51 includes a disc-shaped portion made of a plate material such as pure iron and the disc. Column-shaped center pole 51a erected at the center of the shape
And a magnet guide portion 51b formed of a step formed concentrically with the center pole 51a in a disk-like portion.

On the disk-shaped portion of the yoke 51, N.I. The S and the magnetized or non-magnetized ring-shaped outer magnet 52 are bonded via an adhesive. The inner diameter of the ring-shaped outer magnet 52 is
Is positioned by being fitted to the step portion of the magnet guide portion 51 formed on the disc-shaped portion.

In a general small speaker, the center pole 5 is used.
The width W between the outer diameter 1a and the inner diameter of the outer magnet 52 is considerably large, and forms a substantially cylindrical space portion 54.

Therefore, in the speaker unit with vibrator 50 of this embodiment, the inner magnet 53 is disposed in the space 54 formed inside the inner diameter of the center pole 51a and the outer magnet 52.

The inner magnet 53 has an N.V. The inner magnet 53 is formed into a magnetized or non-magnetized ring shape with S, and the inner magnet 53 is fitted to the magnet guide 51b of the yoke 51 and joined via an adhesive.

Next, a gap guide (not shown) having a cylindrical shape and a gap width on the outer diameter of the center pole 51a.
With the adhesive applied to the upper surfaces of the inner and outer magnets 53 and 52, respectively, and insert the inner diameter of the through hole formed in the second plate 55 and the first plate 56 into the outer diameter of the gap guide. Then, the second and first plates 55 and 56 are joined to the upper surfaces of the respective magnets 53 and 52.

A frame 57 formed in a funnel shape from steel or the like.
Is fixed on the first plate 56 in advance with a stud or the like, or is screwed onto the first plate 56 via a screw or the like to complete the metal part of the magnetic circuit.

The above-described gap guide is connected to the center pole 51.
a, a spacer is inserted into the inner periphery of the voice coil bobbin 58, and the voice coil 59 is inserted into the first magnetic gap 6
The voice coil bobbin 58 and the spacer are inserted from the tip of the center pole 51a.

Next, a wave-shaped damper 61 is joined between the outer periphery of the voice coil bobbin 58 and the bottom of the frame 57,
The voice coil bobbin 58 is held. Further, the inner diameter of the funnel-shaped diaphragm 7A having an edge 62 made of paper or the like is joined to the upper outer diameter portion of the voice coil bobbin 58, and the diaphragm 7A
The maximum diameter portion of the frame 57
After inserting the spacer inserted into the inner periphery of the voice coil bobbin 58 and removing the spacer, a spacer having a thickness capable of holding the vibrator coil bobbin 64 in a predetermined gap is inserted between the inner diameter of the voice coil bobbin 58 and the center pole. By inserting the exciter coil bobbin 64 into the outer diameter of the spacer, the exciter drive coil comes to a predetermined position in the second magnetic gap 66 formed between the second plate 55 and the center pole 51a. Set as above.

The voice coil bobbin 64 for the vibrator projects upward from the top of the center pole 51a, and further extends above the tip of the voice coil 58 of the speaker unit A. A permeable damper / cap 67 made of cloth or the like is bonded to the vicinity of the inclined opening of the diaphragm 7A via an adhesive or the like.

Further, a vibrator damper 68 for the vibrator B, which is formed concentrically in a corrugated shape, is provided above the damper cap 67 between the inner diameter of the vibrator coil bobbin 64 and the inclined middle portion of the diaphragm 7A. With an adhesive. The vibrator damper 68 forms the vibrating plate 7B of the vibrator B. A material having good air permeability such as cloth is selected so that no sound is output from the diaphragm. Reference numeral 70 denotes a dust cap, and this cap 70 is also made of a material having high air permeability. Exciter damper 6
The weight 69 attached to the inner diameter of the vibrator 8 has an equivalent mass of the vibration system of the vibrating plate 7A and the vibrating plate 7B of the vibrator (the vibrator damper 6).
This is for adjusting the equivalent mass of the vibration system of 8).

The tinsel wire 71 is connected to the voice coil 59, and the voice coil 59 and the driving coil 65 for the vibrator are connected in series or in parallel, and the voice coil 59 is disposed in the first and second magnetic gaps 60 and 66. Coil 59 and drive coil 6
5, a current in the same direction flows and the driving force is added. A voice signal is supplied to the voice coil 59 and the drive coil 65 via the input terminal 72 and the tinsel wire 71.

The speaker unit 5 with the vibrator having the above configuration
The input impedance of the drive coil 65 of the vibrator B side in the case of 0 and larger than the input impedance of the voice coil 59 of the speaker unit side, through one of the amplifier from the input terminal T _A as shown in FIG. 1 An electric signal may be given to the input terminal on the speaker unit side, and a power amplifier for driving the drive coil 65 on the vibrator B side can be omitted. When the non-magnetized outer and inner magnets 52 and 53 are used, the magnets may be simultaneously magnetized in a state where the bonding of the adhesive is completed.

When a magnet of a magnetic shield type is required, a cancel magnet magnetized reversely to the outer and inner magnets may be provided on the lower surface of the yoke as in the prior art.

According to the loudspeaker having the above-described structure, the voice coil 5 in the first magnetic gap 60 and the second magnetic gap 66 is formed.
9 and the drive coil 65 to obtain the induced force generated by the magnetic flux interlinking in the two magnetic paths of the first and second magnetic gaps 60 and 66, and the strong drive force in the low frequency range by the added drive force. What gives off radiation is obtained.

FIG. 9 shows another configuration of the speaker unit C with a vibrator according to the present invention. The parts corresponding to those in FIG. 8 are denoted by the same reference numerals, and redundant description will be omitted. In the case of FIG. 9, a diaphragm 7B of the vibrator, that is, a breathable damper 68 is interposed between the vicinity of the maximum outer peripheral opening of the diaphragm 7A for the speaker and the coil bobbin 64 for the vibrator, and the center pole 51a
A main pillar 74 is erected on the top of the coil bobbin 64 for the vibrator.
The damper 68, the cap 70, and the damper-cap 7
3 is selected from a material having high air permeability. Other configurations are the same as those in FIG.

FIG. 10 shows still another configuration of the speaker device according to the present embodiment, in which a vibrator damper 68 includes a diaphragm 7A.
And the inner magnet of the magnetic circuit for the vibrator is formed as a columnar magnet 76a.

That is, in FIG. 10, a columnar center pole 51 is provided at the center of a cup-shaped base 75 made of a non-magnetic member below the ring-shaped outer magnet 52.
a, and a ring-shaped lower plate 76 is joined to the lower surface of the outer magnet 52 via an adhesive.
6 is fitted and fixed to the opening of the base 75,
A second magnetic gap 66 into which a drive coil 65 for a vibrator is inserted is formed between the outer diameter upper end of the center pole 51a and the inner circumference of the lower plate 76.

A cylindrical inner magnet 76a having the same diameter as the center pole 51a is joined to the upper side of the center pole 51a via an adhesive. The thickness of the inner magnet 76a is the same as the thickness of the outer magnet 52. If the outer magnet 52 is magnetized with NS in the thickness direction, the inner magnet 72 is magnetized in the opposite direction to SN, and the inner magnet 72 is magnetized. The inner pole piece 77 is joined to the upper surface of
A voice coil 59 for the speaker unit A is disposed in a first magnetic gap 60 formed between the plate 56 and the inner pole piece 77.

The main pole 74 is located above the inner pole piece 77.
And a damper / cap 73 is provided.

In the above configuration, the speaker unit A
Drive coil 6 of vibrator B
5 driving forces can be added.

FIG. 11 shows still another configuration example of the present invention. A second magnet 79 having the same shape as the speaker unit magnet 52 is used as a magnetic circuit on the vibrator side in FIG. The second magnet 79 is joined between the yoke 51 and the lower plate 76, and the second magnetic gap 66 for the vibrator is formed with the outer diameter of the center pole 51a erected from the yoke 51 and lower. The first magnetic gap 60 for the speaker unit is formed between the inner diameters of the plate 76.
Are formed between the center pole 51a and the inner diameter of the plate 56, and the drive coil 65 and the voice coil 59 for the vibrator are arranged in the respective magnetic gaps so that the driving force is vibrated mutually.

In FIG. 11, the exciter coil bobbin 64 has a damper 73 disposed between the main pillar 74 erected on the top of the center pole 51a and the inner diameter of the exciter coil bobbin 64, the outer diameter of the exciter coil bobbin 64, and the speaker. The unit is swingably supported by a damper 67 interposed between the unit and the inclined middle portion of the diaphragm 7A.

In the magnetic circuit shown in FIG. 11, the magnet 52 for the speaker unit has an N.V. When magnetized with S, the second magnet is N.P. It is configured to be magnetized in the same manner as S and to be superposed.

The configuration shown in FIG. 12 is similar to that of the speaker unit 50 with the vibrator shown in FIG. 8 except that the inner magnet 53 is removed and the voice coil 5 for the vibrator is provided in the first magnetic gap 60.
Since the driving coil 65 wound around 8 is arranged concentrically inside the voice coil 59 for the speaker unit, only one magnet 52 is required, and the radiation force of the vibrator is added to the radiation force of the speaker unit. Addition is possible.

In the configuration shown in FIG. 13, a magnetic circuit and a vibration system for the vibrator are provided in the center hole of the outer magnet 52, and the center of the yoke 51 is magnetized in the same direction as the outer magnet 52. Cylindrical center magnet 8
0 is erected and joined on the yoke, and the disc-shaped pole piece 81 is joined on the center magnet 80 via an adhesive.

Next, a ring-shaped magnet 82 is inserted between the center magnet 80 and the outer magnet 52.
The magnet 82 is placed on the yoke 51 via an adhesive so that the magnetized polarities of the center magnet 80 and the outer magnet 52 in the thickness direction are opposite to each other so that the magnet 82 and the outer magnet 52 are concentric around the center. Magnetize and join. A ring-shaped plate 84 is joined to the top of the magnet 82.

Accordingly, the second magnetic gap 66 into which the drive coil 65 for driving the vibration system of the vibrator is inserted is formed between the pole piece 81 and the plate 84.

The vibrator coil bobbin 64 around which the vibrator drive coil 65 is wound is a damper having a relatively hard waveform interposed between the inner diameter of the voice coil bobbin 58 for the speaker unit and the outer diameter of the coil bobbin 64 for the vibrator. Cap 8
5 and a substantially flat weight 86 for adding an equivalent mass is joined to the vibrator coil bobbin 64 so as to cover the opening of the vibrator coil bobbin 64, and a dome-shaped cap 87 is applied to the vibrating plate 7A. It is joined so as to cover the vibration system of the vessel.

In the example shown in FIG. 13 as well, a vibrator and a speaker unit can be integrated, and a speaker unit with a vibrator capable of adding respective radiation powers can be obtained.

The configuration shown in FIGS. 14 to 16 is a case in which a vibration system of a vibrator is arranged between the diaphragm constituting the speaker unit and the magnetic circuit, and is opposite to the configuration shown in FIGS. 8 to 13. The drive coil 65 for the vibrator is provided in the first magnetic gap 60, and the voice coil for the speaker unit is provided in the second magnetic gap 66.

In the example of FIG. 14, the same magnetic circuit as shown in FIG. 11 is used in which two magnets are stacked in the same manner as in FIG. 11, but the coil bobbin 64 for the vibrator constituting the vibration system of the speaker unit is compared with the voice coil bobbin 58 for the speaker unit. The voice coil bobbin 58 for the speaker unit is extended to the position of the second magnetic gap 66 so as to be long, and the voice coil 59 is formed in the second magnetic gap 6.
6

The inner diameter of the voice coil bobbin 58 and the support 74
A voice coil bobbin 58 is provided with a damper 73 interposed therebetween.
And the vibration system of the speaker unit including the diaphragm 7A is held by the damper 61.

The coil bobbin 64 for the vibrator is held by double tampers 68 and 67 interposed between the bottom surface of the frame 57 and the outer diameter of the coil bobbin 64 for the vibrator. Is a treble cap.

FIG. 15 shows an example in which the same magnetic circuit as in FIG. 10 is used for the vibration system of the same speaker unit and vibrator as in FIG.

The example of FIG. 16 uses the same speaker and vibrator vibration system as those of FIGS. 14 and 15, and the magnetic circuit uses the yoke 51 and magnet 79 of FIG. 14 instead of the base and center pole 51a of FIG. It was what was.

[0088]

According to the loudspeaker device of FIGS. 1 to 7 and the loudspeaker unit with a vibrator shown in FIGS. 8 to 16, the radiant force of the loudspeaker unit is added to the radiant force of the vibrator. And the radiation power of the vibrator is added to the radiation power of the bass sound, especially of a small and lightweight speaker device, to obtain a speaker device that is powerful and has improved sound quality. Further, it is possible to obtain a speaker device which can omit a power amplifier or the like for driving a vibrator.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a speaker device of the present invention.

FIG. 2 is a sectional view showing an example of a vibrator used in the speaker device of the present invention.

FIG. 3 is a cross-sectional view showing another example of the vibrator used in the speaker device of the present invention.

FIG. 4 is another sectional view showing an example of the speaker device of the present invention.

FIG. 5 is still another sectional view (I) showing an example of the speaker device of the present invention.

FIG. 6 is still another sectional view (II) showing an example of the speaker device of the present invention.

FIG. 7 is still another sectional view (III) showing an example of the speaker device of the present invention.

FIG. 8 is a sectional view (I) of a speaker unit with a vibrator used in the speaker device of the present invention.

FIG. 9 is a sectional view (II) of a speaker unit with a vibrator used in the speaker device of the present invention.

FIG. 10 is a sectional view (III) of a speaker unit with a vibrator used in the speaker device of the present invention.

FIG. 11 is a sectional view (IV) of a speaker unit with a vibrator used in the speaker device of the present invention.

FIG. 12 is a sectional view (V) of a speaker unit with a vibrator used in the speaker device of the present invention.

FIG. 13 is a sectional view (VI) of a speaker unit with a vibrator used in the speaker device of the present invention.

FIG. 14 is a sectional view (VII) of a speaker unit with a vibrator used in the speaker device of the present invention.

FIG. 15 is a sectional view (VIII) of a speaker unit with a vibrator used in the speaker device of the present invention.

FIG. 16 is a sectional view (IX) of a speaker unit with a vibrator used in the speaker device of the present invention.

FIG. 17 is a partial cross-sectional view showing an example of a conventional speaker device.

[Explanation of symbols]

A speaker unit, B shaker (electricity, vibration transducer), 50 speaker unit with shaker, 21 cabinet, 22 baffle board,
23 ‥‥ duct

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Akihiro Akiyama 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Naoki Watanabe 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Kenji Tokushige 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation

Claims (6)

[Claims] 1. A speaker device comprising: an electric vibration transducer for adding the radiation force of a speaker unit mounted in a cabinet fixed to a fixed portion, in the cabinet. 2. The electric and vibration transducers are arranged on the back of the magnetic circuit of the speaker unit back to back so that the openings of the electric and vibration transducers and the diaphragm of the speaker unit face in opposite directions. The speaker device according to claim 1, wherein the speaker device is formed. 3. The speaker device according to claim 1, wherein the electric and vibration transducer is mounted in the cabinet facing the back of the speaker unit. 4. The speaker device according to claim 1, wherein said electric / vibration transducer is disposed on the same plane as said speaker unit. 5. The input impedance of the voice coil of the electric / vibration transducer is larger than the input impedance of a voice coil of the speaker unit. A speaker device according to claim 1. 6. The speaker device according to claim 1, wherein a drive coil of the electric / vibration transducer is provided in a magnetic gap of the magnetic circuit for the speaker unit.