JPH09238396A - Speaker unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a thin profile and reproduction with a large sound pressure while securing a sufficient amplitude. SOLUTION: A damper 5 is arranged toward inner circumferential side from a field magnetic gap 1d, a damper moving end 5a is fitted to a diaphragm 7, the diaphragm 7 is fitted to a top of a coil bobbin 3a, the voice coil 3 is held in the magnetic gap 1d by the damper 5 via the diaphragm 7. An inner circumferential hole between a plate 1c and the magnet la is used for a damper amplitude moving area space 1e. Since it is not required to provide a lower displacement amplitude space for a damper moving end 5a to an upper part of a field 1, thin profile is attained. Furthermore, since the distance between the damper 5 and the lower end of the voice coil 3 is decreased, a horizontal deflection of the lower end of the voice coil is small even on the occurrence of rolling and the contact of the lower end of the voice coil with the field 1 is prevented and a large sound pressure is reproduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker unit that achieves both thinness and high sound pressure reproduction.

[0002]

2. Description of the Related Art Conventionally, there has been a great demand for a thinner speaker system in order to support the speaker system on a wall, to save space and to improve interior quality, and various measures have been made for that purpose. Hereinafter, a conventional speaker unit whose thickness is reduced will be described with reference to the drawings.

As a conventional thinned speaker unit, a combination of a voice coil having a large diameter and a flat diaphragm is widely known as shown in FIG.
FIG. 14 is a structural diagram of a speaker unit of the type disclosed in Japanese Utility Model Publication No. 56-45278.

In FIG. 13, the diaphragm 127 is not a cone type but a plane type in order to make the speaker unit thin, and in order to obtain good frequency characteristics with such a diaphragm, the voice coil 123 has a large diameter. I have to.

The field part 121 is an inner magnet type field part composed of a magnet 121a, a yoke 121b and a plate 121c since a voice coil having a large diameter is used.

The outer peripheral portion of the damper 125 is the frame 12
The voice coil bobbin 123a is mounted on the outer peripheral surface of the voice coil bobbin 123a. The voice coil 123 is held in the magnetic gap 121d. A voice coil lead wire (also known as a tinsel wire) 123 b is drawn out from the voice coil bobbin 123 a and connected to the terminal plate 124.

The diaphragm 127 is a voice coil bobbin 123.
It is attached to the top of a and is supported on its outer circumference by an edge 126 attached to the frame 122.

In FIG. 14, the inner peripheral portion of the damper 135 is fixed to the damper fixing base 131f attached to the field magnet 131, and the movable end 135a on the outer periphery thereof is attached to the inner peripheral surface of the voice coil bobbin 133a. There is. The other configuration is the same as that of the speaker unit of FIG.

With the above structure, since the deep cone type diaphragm is not used, the speaker unit can be thinned by the thickness of the diaphragm.

[0010]

However, in the above-mentioned conventional structure, it is not possible to make the thickness too thin in order to secure a sufficient vibration amplitude of the diaphragm, and an abnormal sound is liable to be generated when the vibration system causes rolling and a loud noise. There were two major problems that pressure regeneration was not possible.

The reasons for these problems will be described below with reference to the drawings. First, the first problem will be described with reference to FIG.

The configuration of the speaker unit shown in FIG. 15 is shown in FIG.
Is exactly the same as that described in. H1 is a yoke 141
The thickness of b, H2 is the distance from the lower end of the voice coil 143 to the yoke 141b, H3 is the dimension of the lower end of the voice coil from the plate 141c, and H4 is the plate 1
41c has a thickness H5 from the upper surface of the field magnet 141 to the damper 1
The distance to the lower surface of 45, H6 is the height of the damper 145. H7 + α is the distance from the upper surface of the damper 145 to the back surface of the diaphragm 147, and α is the voice coil lead wire 14
3b is an amplitude margin space for preventing the damper 145 and the vibration plate 147 from resonating and usually 2 to 3
It is about 3 mm. H8 is the distance from the back surface of the diaphragm 147 to the upper end surface of the frame 142.

If the maximum amplitude value on one side of the diaphragm is X, then H
2 = X, H5 = X, H7 = X must be set.

The total height HT of the speaker unit is HT = H
1 + H2 + H3 + H4 + H5 + H6 + H7 + α + H8, but from the above, HT = H1 + X + H3 + H4 + X + H
6 + X + α + H8 = 3X + H1 + H3 + H4 + H6 + α
It becomes + H8.

That is, H1, H3, H4, H6, α, H8
However, even if it is made small, a space of 3 times the maximum amplitude value on one side is absolutely necessary, and if it is attempted to secure a sufficient amplitude, the speaker unit cannot be thinned.

The conventional speaker unit described with reference to FIG. 14 also has a similar problem although it can be made slightly thinner because the α dimension becomes unnecessary.

Next, the second problem will be described with reference to FIG. The configuration of the speaker unit shown in FIG. 16 is exactly the same as that described with reference to FIG.

S is a center point when the vibration system (general term for vibrating parts such as a voice coil and a diaphragm) is rolling, and is a stationary height position of the damper movable end 155a. L1
Is the distance from the attachment surface position of the edge 156 to the diaphragm 157, that is, the distance from the surface of the diaphragm 157 to the rolling center point S, and L2 is the distance from the lower end of the voice coil 153 to the rolling center point S.

Here, the vibration system rolls at an angle θ,
Assuming that the horizontal deflection dimension of the central portion of the surface of the diaphragm 157 is A, A = L1 × sin θ, and the voice coil 1
Assuming that the horizontal runout dimension at the center of the lower end portion of 53 is B, B = L2 × sin θ. Here, θ is a small value, and it can be approximated that the horizontal deflection size at the lower end of the voice coil 153 is equal to B. Therefore, the horizontal deflection dimension at the lower end of the voice coil 153 is A ×
It can be regarded as (L2 / L1).

As L2 is larger than L1, (L2 /
L1) becomes large and horizontal deflection at the lower end portion of the voice coil 153 becomes large.
Is likely to come into contact with the yoke 151b and the plate 151c to generate an abnormal sound.

In the conventional speaker unit designed to be thin, since the diaphragm is thinned, L1 is smaller than that of an ordinary speaker unit using a deep cone type diaphragm, so (L2 / L1) is common. Larger than the speaker unit of. Therefore, as compared with an ordinary speaker unit, when the rolling occurs, the vibration of the lower end portion of the voice coil is large, so that an abnormal sound is easily generated. This problem also applies to the conventional speaker unit described with reference to FIG.

The present invention solves the above-mentioned conventional problems, and realizes further thinning while ensuring a sufficient amplitude,
Moreover, it is an object of the present invention to provide a speaker unit capable of reproducing a large sound pressure without generating abnormal sound due to rolling.

[0023]

In order to achieve this object, a speaker unit according to the present invention comprises a damper arranged on the inner circumference side of a magnetic gap of a field part, and a damper amplitude movable range below the damper. A field part having a space is provided, and a vibration system part other than the voice coil bobbin located vertically in the field part magnetic gap is attached to the movable end of the damper to support the vibration system, and the voice coil bobbin is provided. Is configured so that a damper supporting the vibration system is not attached.

With the above structure, since it is not necessary to provide a lower displacement amplitude space of the damper movable end above the field magnet portion, it is possible to reduce the thickness by one side maximum amplitude value as compared with the conventional case.

Further, since the distance from the rolling center point to the lower end of the voice coil is significantly shortened, even if rolling occurs, the horizontal deflection of the lower end of the voice coil becomes small, and this makes contact with the field magnet to cause abnormal noise. It is possible to prevent the occurrence of noise and to reproduce a large sound pressure.

[0026]

According to a second aspect of the present invention, the field magnet portion is of an inner magnet type, the damper is arranged on the inner peripheral side of the field portion magnetic gap, and the damper amplitude movable range space is provided. The inner peripheral hole of the field part, the movable end of the damper are the inner peripheral part of the damper, and the vibration system part attached to the movable end of the damper is the central part of the diaphragm. It is possible to eliminate the generation of sound.

According to a third aspect of the present invention, the field magnet portion is of an inner magnet type, the damper is arranged on the inner peripheral side of the field portion magnetic gap, and the damper amplitude movable range space is provided in the field portion. The inner peripheral hole is used, the damper movable end is the damper outer peripheral part, and the vibration system part attached to the damper movable end is the central part of the diaphragm. Like the above, it is possible to reduce the thickness and generate abnormal noise due to rolling. Can be eliminated.

According to a fourth aspect of the present invention, the field magnet portion is an outer magnet type, the damper is arranged on the inner peripheral side of the field portion magnetic gap, and the damper amplitude movable range space is provided on the top of the yoke pole. The movable end of the damper is provided as the inner peripheral part of the damper, and the vibration system part attached to the movable end of the damper is provided as the central part of the diaphragm. In addition to the functions of claims 2 and 3, the magnet can be arbitrarily enlarged in size. The efficiency can be improved.

According to a fifth aspect of the present invention, the vertical position of the movable end of the damper is set lower than the vertical position of the fixed end of the damper. In addition to the actions of the second and third aspects, it is excessive. It is possible to eliminate the occurrence of abnormal sound when inputting.

According to a sixth aspect of the present invention, the field portion plate is formed by bending the magnetic gap portion in the vertical direction. In addition to the actions of the second and third aspects, a speaker unit is provided. The cost and weight can be reduced, and the linearity characteristics and reliability can be improved.

According to a seventh aspect of the present invention, a coupling cone for connecting the voice coil bobbin top portion, the damper movable end and the diaphragm is provided, and the central portion of the coupling cone is attached to the damper movable end. Therefore, in addition to the effects of claims 2 and 3, mass productivity can be improved.

According to an eighth aspect of the present invention, the coupling cone is attached near the position of the node of the first high resonance frequency of the vibration plate.
In addition to the effect of, the reproduction frequency band can be expanded.

According to a ninth aspect of the present invention, an elastic body is provided between the coupling cone and the vibrating plate, and in addition to the functions of the second, third and seventh aspects, the high range is steep. Can be attenuated.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 1 is a structural diagram of a speaker unit according to a first embodiment of the present invention. In FIG. 1, the speaker unit has a diameter of 12 cm. Reference numeral 1 is an inner magnet type magnetic field portion. 1a is a magnet, the outer diameter is 55 mm, the inner diameter is 26 mm, the thickness is 9 mm, and the material is ferrite. 1b is a yoke, the thickness is 2 mm, and the material is iron. 1c is a plate having an outer diameter of 60 mm and an inner diameter of 3
The thickness is 0 mm, the thickness is 4 mm, and the material is iron. 1d is a magnetic gap having an inner diameter of 60 mm and an outer diameter of 64 mm.

1e is a damper amplitude movable range space,
The inner peripheral holes of the plate 1c and the magnet 1a are in contact with this.

Reference numeral 2 is a frame, the material of which is 0.6 m thick
It is an iron plate of m. 3 is a voice coil having a maximum outer diameter of 63.4 mm. 3a is a voice coil bobbin, which has an inner diameter of 60.6 mm and is made of aluminum with a thickness of 0.075 mm. 3b is a voice coil lead wire (also known as a tinsel wire).

Reference numeral 4 is a terminal plate. 5 is a damper, the diameter of the fixed end is 30 mm, and the height of corrugation is 2 m
m, the material is cotton cloth. 5a is a movable end of the damper.
Reference numeral 6 is an edge, and the material is urethane foam having a thickness of 0.7 mm. Numeral 7 is a flat type diaphragm with a diameter of 80 m.
m, the thickness is 2 mm, and the material is plastic. The outer diameter of the protrusion at the center of the diaphragm 7 is 10 mm, the inner diameter is 6 mm, and the height is 10 mm.

The outer peripheral end of the damper 5 is fixed to the plate 1c, and the movable end 5a thereof is attached to the central projection of the diaphragm 7. The diaphragm 7 is a voice coil bobbin 3a.
The voice coil 3 is attached to the top portion of the voice coil 3 and is held in the magnetic gap 1d by the damper 5 via the diaphragm 7.

That is, unlike the conventional speaker unit, no damper is attached to the voice coil bobbin 3a vertically positioned in the magnetic gap of the field magnet portion.

A voice coil lead wire 3b is drawn out from the voice coil bobbin 3a and connected to the terminal board 4. The diaphragm 7 is an edge 6 attached to the frame 2.
The outer periphery is supported by.

The operation and effect of the speaker unit of the present embodiment configured as described above will be described below with reference to FIGS. 2 and 3.

First, the first operation and effect of the speaker unit of the present embodiment, that is, the operation and effect of thinning will be described. FIG. 2 is a diagram for explaining the first action and effect of the speaker unit of the present embodiment. The configuration of the speaker unit in FIG. 2 is exactly the same as that described in FIG.

In FIG. 2, H1 is the thickness of the yoke 11b, and H1 = 2 mm. H2 is the distance from the lower end of the voice coil 13 to the yoke 11b, and H2 = 8 mm. H3 is the dimension of the lower end of the voice coil protruding from the plate 11c, where H3 = 1 mm. H4 is the thickness of the plate 11c, and H4 = 4 mm.

H6 is the height of the damper 15, H6 = 2 mm
It is. H7 is the distance from the upper surface of the damper 15 to the back surface of the diaphragm 17, and H7 = 8 mm. H8 is diaphragm 17
H8 = the distance from the back surface of the frame to the top surface of the frame 12.
3 mm.

If the maximum amplitude value on one side of the diaphragm is X, then X =
8 mm, H2 = X = 8 mm, H7 = X = 8 mm,
H7 + α = X + α = 10 mm. α is an amplitude allowance space for preventing the voice coil lead wire 13b from resonating and hitting the field magnet portion 11 and the diaphragm 17, and α
= 2 mm.

The total height HT of the speaker unit is H6 ≧ α
In case of, HT = H1 + H2 + H3 + H4 + H6 + H7 +
When H8 and H6 ≦ α, HT = H1 + H2 + H3 + H4
+ H7 + α + H8 (both HT have the same value because H6 = α in the present embodiment).

Since H2 = X and H7 = X, when H6 ≧ α, HT = H1 + X + H3 + H4 + H6 + X + H8 = 2
X + H1 + H3 + H4 + H6 + H8, when H6 ≦ α, HT = H1 + X + H3 + H4 + X + α + H8 = 2X + H
1 + H3 + H4 + α + H8 (in the present embodiment, H
Since 6 = α, both HTs have the same value).

That is, the total height of the conventional speaker unit described in FIG. 15 is HT = 3X + H1 + H3 + H4 + H6 +.
In contrast to α + H8, in the case of H6 ≧ α, HT is (3X + H1 + H3 + H4 + H6 + α + H8)
The thickness can be reduced by-(2X + H1 + H3 + H4 + H6 + H8) = X + α. Alternatively, when H6 ≦ α, HT is (3X + H1 + H3 + H4 + H6 + α + H8) −
(2X + H1 + H3 + H4 + α + H8) = X + H6 can be thinned (in this embodiment, H6 = α, so both are the same value).

In other words, since it is not necessary to provide the lower displacement amplitude space of the damper movable end at least above the field magnet portion, it is possible to reduce the thickness by at least one side maximum amplitude value as compared with the conventional case.

Comparing conditions such as field size and diaphragm thickness with each other and comparing the total heights of the present invention and the conventional speaker unit numerically, when the maximum amplitude value on one side is 8 mm, the conventional speaker shown in FIG. The limit of the total height of the unit is 38 mm, whereas the total height of the speaker unit of the present invention can be only 28 mm.

Next, the second function and effect of the speaker unit of the present embodiment, that is, the function and effect of preventing abnormal sound generation will be described. FIG. 3 is a diagram for explaining the second action and effect of the speaker unit of the present embodiment. The configuration of the speaker unit shown in FIG. 3 is exactly the same as that described with reference to FIG.

In FIG. 3, S is the center point when the vibration system (general term for vibrating parts such as voice coil and diaphragm) is rolling, and is the stationary height position of the damper movable end 25a. L1 is the position of the mounting surface of the edge 26 with respect to the diaphragm 27, that is, the distance from the surface of the diaphragm 27 to the rolling center point S, and L1 = 12 mm (H6 in FIG. 2).
+ H7 + corresponding to a diaphragm thickness of 2 mm).

L2 is the distance from the lower end of the voice coil 23 to the rolling center point S, and L2 = 5 mm (see FIG. 2).
In (corresponding to H3 + H4).

Here, the vibration system rolls at an angle θ,
Assuming that the horizontal deflection dimension of the central portion of the surface of the diaphragm 27 is A, the horizontal deflection dimension B1 at the lower end of the voice coil 23 can be regarded as B1 = A × (L2 / L1).

Since L2 has a small value of about the thickness of the plate 21c, (L2 / L1) has a small value.
In the case of this embodiment, (L2 / L1) = 0.42,
B1 = A × 0.42.

A comparison will be made with the conventional speaker unit described in FIG. In this conventional speaker unit, L
1 = 14 mm (corresponding to H6 + H7 + α + diaphragm thickness 2 mm in FIG. 15), L2 = 13 mm (corresponding to H3 + H4 + H5 in FIG. 15), and (L2
/L1)=0.93, and the horizontal shake dimension at the lower end of the voice coil 153 is A × 0.93.

That is, the horizontal vibration of the lower end of the voice coil of the speaker unit of this embodiment is significantly less than half that of the conventional speaker unit. Therefore, even if the diaphragm shakes horizontally due to rolling, the horizontal vibration of the lower end of the voice coil is small, and the lower end of the voice coil comes into contact with the field part to generate an abnormal sound like a conventional speaker unit. There is nothing to do.

As described above, according to the present embodiment, since it is not necessary to provide the lower displacement amplitude space of the damper movable end above the field magnet portion, it is possible to reduce the thickness by at least one side maximum amplitude value as compared with the conventional case. it can. Also, since the distance from the rolling center point to the lower end of the voice coil is greatly shortened, even if rolling occurs, the horizontal deflection of the lower end of the voice coil will be small, and this will contact the field part and generate an abnormal sound. This can be prevented, and high sound pressure reproduction can be performed.

In this embodiment, the plate inner peripheral hole and the magnet inner peripheral hole are provided as the damper amplitude movable range space. However, by providing a hole on the bottom surface of the yoke and abutting the same space, It can handle large amplitudes. Further, in some cases, only the inner peripheral hole of the plate may be applied to the same space.

Further, in the present embodiment, the damper movable end is attached to the integral type diaphragm having the protrusion at the central portion. However, for example, a cylindrical structure may be provided between the diaphragm and the damper movable end. Therefore, it is of course possible to indirectly attach the diaphragm central portion and the damper movable end.

Although the damper is attached to the plate in the present embodiment, it may be attached to the inner peripheral portion of the upper surface of the magnet. Alternatively, a spacer sheet or the like may be attached on the plate and a damper may be attached on the spacer sheet. Further, in the present embodiment, a so-called flat damper having no rising on the outer peripheral portion of the damper is used, but this may be used as a rising damper.

Further, in the present embodiment, the damper movable end is attached to the integral type diaphragm having the protrusion provided at the center portion. However, for example, a cylindrical structure may be provided between the diaphragm and the damper movable end. Therefore, it goes without saying that the diaphragm central portion and the damper movable end may be indirectly attached.

In the present embodiment, the voice coil bobbin is not provided with a damper for supporting the vibration system. However, for example, a damper-shaped protective net (which supports the vibration system is provided to prevent dust from entering the magnetic gap). It is not intended to be installed) on the voice coil bobbin.

It is also possible to attach an auxiliary damper for temporarily supporting the voice coil bobbin when assembling the speaker unit, and remove this auxiliary damper after the assembly is completed.

Needless to say, the present invention is not limited to the above-described examples.

(Second Embodiment) FIG. 4 is a structural diagram of a speaker unit according to a second embodiment of the present invention. The speaker unit of this embodiment has exactly the same configuration as that of the first embodiment shown in FIG. 1 except for the diaphragm 37, and therefore description thereof will be omitted.

In this embodiment, the vibration plate 37 is of a cone type, and the fitting portion 37a for mounting the voice coil bobbin 33a is provided. The center of the diaphragm 37 is attached to the damper movable end 35a. The diaphragm 37 has a diameter of 80 mm, a total height of 11 mm, and a material of 0.8 m in thickness.
It is m paper.

The basic operation and effect of the speaker unit of the present embodiment configured as described above are exactly the same as those of the first embodiment.

Further, in this embodiment, since the vibration plate 37 is of the cone type, a general-purpose material such as paper can be used as the vibration plate material, and the cost of the vibration plate can be reduced. Further, by providing the mounting fitting portion 37a, mass productivity of the speaker unit can be improved.

Needless to say, the present invention is not limited to the above-mentioned examples.

(Third Embodiment) FIG. 5 is a structural diagram of a speaker unit according to a third embodiment of the present invention. The speaker unit of the present embodiment includes a field unit 41, a frame 42,
The voice coil 43, the edge 46, and the terminal plate 44 have exactly the same configurations as those of the first embodiment shown in FIG. 1, and therefore their explanations are omitted.

In the present embodiment, the damper movable end 45a is used as the outer peripheral portion of the damper 45, and the damper 45 is attached to the damper fixing base 41f provided at the center of the bottom surface of the yoke 41b. The damper fixing base 41f has a diameter of 8 mm and the yoke 41b.
The height is 9 mm excluding the projection of the fitting portion of and, and the material is plastic.

The vibrating plate 47 is a flat plate like the first embodiment, has a thickness of 2 mm, and is made of plastic. However, the diameter of the central projection is larger than that of the first embodiment, and the outer diameter is 24 mm, the inner diameter is 21 mm, and the height is 14 mm.

The basic operation and effect of the speaker unit of this embodiment configured as described above are exactly the same as those of the first embodiment.

Further, in this embodiment, the damper movable end 45 is used.
Since the diameter of the damper movable end 45a is increased by using a as the outer peripheral portion of the damper 45, the diameter of the central portion of the diaphragm 47 attached to this is increased, and stress is locally applied to the central portion of the diaphragm 47. This is alleviated. Therefore, it is possible to reduce the thickness of the diaphragm, and thus the degree of freedom in designing the diaphragm is increased.

Although the damper fixing base is attached to the bottom surface of the yoke in the present embodiment, for example, the frame may be extended to the back surface of the yoke, and the bottom surface of the yoke may be perforated to be attached to the central portion of the frame.

Needless to say, the present invention is not limited to the above-described examples.

(Fourth Embodiment) FIG. 6 is a structural diagram of a speaker unit according to a fourth embodiment of the present invention. This speaker unit also has a diameter of 12 cm, and the frame 52, the diaphragm 57, the edge 56, and the terminal plate 54 have the same configuration as that of the speaker unit of the first embodiment, and therefore description thereof will be omitted.

Reference numeral 51 denotes a field magnet portion, which is an outer magnet type in the present embodiment. 51a is a magnet with an outer diameter of 90 m
m, the inner diameter is 50 mm, the thickness is 9 mm, and the material is ferrite. 51b is a yoke having an outer diameter of 85 mm, a thickness of 2 mm, a pole diameter of 45 mm, and a pole height of 1
4 mm, the material is iron. 51c is a plate having an outer diameter of 85 mm, an inner diameter of 49.1 mm, a thickness of 4 mm, and a material of iron. 51d is a magnetic gap with an inner diameter of 4
The outer diameter is 5 mm and the outer diameter is 49.1 mm.

Reference numeral 51e is a damper movable range space, which is a hole provided at the top of the pole of the yoke 51b in the present embodiment. The entrance diameter of this hole is 38 mm, the bottom diameter is 30 mm, and the depth is 9 mm. Reference numeral 53 is a voice coil having a maximum outer diameter of 48.4 mm. Reference numeral 53a is a voice coil bobbin, which has an inner diameter of 45.48 mm and is made of aluminum having a thickness of 0.05 mm. 53b is a voice coil lead wire (also known as a tinsel wire).

55 is a damper, the height of the corrugation is 1.5 mm, and the material is cotton cloth. 55a is a movable end of the damper.

In this embodiment, the outer peripheral end of the damper 55 is attached to the pole top of the yoke 51b. The damper movable end 55a is attached to the central portion of the diaphragm 57, and no damper is attached to the voice coil bobbin 53a vertically positioned in the magnetic gap of the field magnet portion unlike the conventional speaker unit. Is the same as the embodiment described so far.

The basic operation and effect of the speaker unit of the present embodiment configured as described above are exactly the same as those of the first embodiment.

Further, in the present embodiment, the field portion 51 is of the outer magnet type, so that the diameter of the magnet 51a can be arbitrarily increased without being limited by the diameter of the voice coil 53, so that the efficiency of the speaker unit is increased. Easy to do.

In this embodiment, the damper movable range space is a hole provided at the top of the pole of the yoke, but it goes without saying that it may be a through hole. Alternatively, a spacer sheet or the like may be attached on the pole and a damper may be attached on the spacer sheet.

Needless to say, the present invention is not limited to the examples described above.

(Fifth Embodiment) FIG. 7 is a structural diagram of a speaker unit according to a fifth embodiment of the present invention. The speaker unit of this embodiment has exactly the same configuration as that of the first embodiment shown in FIG. 1 except for the damper 65, and therefore description thereof will be omitted.

In the present embodiment, a falling portion is provided on the outer peripheral portion of the damper 65, and the fixed end 6 of the outer peripheral end portion of the damper 65 is provided.
The vertical position of the damper movable end 65a is about 3 mm lower than the vertical position of 5b.

The basic operation and effect of the speaker unit of the present embodiment configured as described above are exactly the same as those of the first embodiment.

Further, in the present embodiment, the damper fixed end 65
By setting the vertical position of the damper movable end 65a to be lower than the vertical position of b, the displacement of the damper movable end 65a causes the struts to be generated earlier than the displacement of the damper movable end 65a. It can be prevented that the end 65a is displaced downward and the lower end of the voice coil 63 hits the bottom surface of the yoke 61b to generate an abnormal sound.
Therefore, it is possible to realize a speaker unit that does not generate an abnormal sound even if an excessive input is input.

Needless to say, the present invention is not limited to the examples described above.

(Sixth Embodiment) FIG. 8 is a structural diagram of a speaker unit according to a sixth embodiment of the present invention. Since the speaker unit of this embodiment has the same configuration as that of the first embodiment shown in FIG. 1 except for the plate 71c,
A description of these is omitted.

In this embodiment, the plate 71c has a shape bent upward in the vertical direction in the magnetic gap portion 71d. The outer diameter of the bent portion of the plate 71c is 6
The inner diameter is 0 mm and the inner diameter is 30 mm. Material is 1.5mm thick
It is an iron plate, and is bent upward by about 2.5 mm. The size of the magnetic gap 71d is the same as that of the speaker unit according to the first embodiment.

The basic operation and effect of the speaker unit of this embodiment configured as described above are exactly the same as those of the first embodiment.

Further, in the present embodiment, the plate 71c
Since the plate 71c can be made of a thin material by having the shape bent upward in the magnetic gap portion 71d, the cost and weight of the speaker unit can be reduced.

Further, since the rolling center point, that is, the position of the damper movable end, further approaches the lower end portion of the voice coil,
There is also an effect that the swing dimension of the lower end portion of the voice coil is further reduced when rolling occurs.

In this embodiment, the plate is bent upward in the magnetic gap portion in the vertical direction, but the plate is bent downward in the magnetic gap portion by increasing the thickness of the magnet. It may have a shape.

Needless to say, the present invention is not limited to the examples described above.

(Seventh Embodiment) FIG. 9 is a structural diagram of a speaker unit according to a seventh embodiment of the present invention. The speaker unit of this embodiment has exactly the same configuration as that of the sixth embodiment shown in FIG. 8 except for the damper 85, and therefore description thereof will be omitted.

In this embodiment, a rising portion having a height of 2.5 mm is further provided on the outer peripheral portion of the damper 85, and the damper 85
The fixed end portion has a diameter of 48 mm and is larger than the inner diameter of the plate 81c. Corrugation height is 2m
m, the total height is 4.5 mm, and the material is cotton cloth.

The basic operation and effect of the speaker unit of the present embodiment configured as described above are as follows:
The embodiment is exactly the same as the embodiment. Although the height of the damper 85 is increased by the rising dimension of the outer peripheral portion, the plate 81c
Since it can be made of a thin material, the rolling center point does not become high.

Furthermore, in the present embodiment, the plate 81c is bent vertically upward in the magnetic gap 81d, and the diameter of the fixed end of the damper 85 is made larger than the inner diameter of the plate 81c.
Since the movable span (the length from the fixed end to the movable end) can be increased, the linearity of the speaker unit can be improved.

Further, since the fatigue of the damper 85 is reduced, breakage of the damper 85 is eliminated and the reliability of the speaker unit can be improved.

Needless to say, the present invention is not limited to the examples described above.

(Embodiment 8) FIG. 10 is a structural diagram of a speaker unit according to an eighth embodiment of the present invention. The speaker unit of this embodiment has exactly the same configuration as that of the first embodiment shown in FIG. 1 except for the diaphragm 97 and the coupling cone 98, and therefore description thereof will be omitted.

In this embodiment, the diaphragm 97 is a flat diaphragm without a protrusion provided at the center thereof. Further, a coupling cone 98 for connecting the top of the voice coil bobbin 93a, the damper movable end 95a and the diaphragm 97 is provided, and the central portion of the coupling cone 98 is attached to the damper movable end 95a.

The diaphragm 97 has a diameter of 80 mm and a thickness of 2 m.
m, the material is plastic. Coupling cone 9
The outer diameter of 62 is 62 mm, the total height is 10.5 mm, and the material is paper having a thickness of 0.5 mm. A fitting portion with the voice coil bobbin 93a is provided on the outer peripheral portion thereof, and the diameter thereof is 61 mm.

The basic operation and effect of the speaker unit of the present embodiment configured as described above are exactly the same as those of the first embodiment.

Further, in this embodiment, since the top portion of the voice coil bobbin 93a, the damper movable end 95a, and the coupling cone 98 for connecting the diaphragm 97 are provided, it is not necessary to attach the diaphragm 97 to the damper movable end 95a. In addition, the mechanical load on the diaphragm 97 is significantly reduced, and the degree of freedom in design is greatly increased.

Further, the vibration plate 97 is attached to the coupling cone 98 by attaching the voice coil 93 and the damper 9 to each other.
5. Since it can be performed separately from the attachment of the coupling cone 98 to the field magnet 91, high positioning accuracy is not required and the mass productivity of speaker units can be improved.

In this embodiment, the diaphragm is a flat type, but it may be a cone type, a dome type, or any other shape.

Needless to say, the present invention is not limited to the examples described above.

(Ninth Embodiment) FIG. 11 is a structural diagram of a speaker unit according to a ninth embodiment of the present invention. The speaker unit of the present embodiment has exactly the same configuration as that of the eighth embodiment shown in FIG. 10 except for the characteristic correction piece 107a and the coupling cone 108, and therefore description thereof will be omitted.

In the present embodiment, the coupling cone 10
Reference numeral 8 is attached to the vibrating plate 107 near the position of the node of the first high-frequency resonance frequency. The position of the node of the primary high-frequency resonance frequency of the diaphragm 107 alone is 57 mm in diameter.

Reference numeral 107a is a characteristic correction piece and is used for the diaphragm 10
7 is attached to the back surface of the vibration plate 107, and the position of the node of the first-order high-frequency resonance frequency of the vibration plate 107 is moved and adjusted to the inner circumference.
Vibration plate 107 with characteristic correction piece 107a attached
The diameter of the first high resonance frequency node of is 54 mm.

The outer diameter of the coupling cone 108 is 62 m.
The outer diameter of the mounting surface of the diaphragm 107 is 56 mm, the inner diameter is 52 mm, and the mounting position average diameter is 54 mm. The total height of the coupling cone 108 is 10.5 mm, and the material is paper having a thickness of 0.5 mm.

The characteristic correction piece 107a has a diameter of 8 mm and a thickness of 3
mm, the material is foamed butyl rubber. Characteristic correction piece 10
The position of the node of the diaphragm 107 when there is no 7a is 57 mm in diameter.
It is.

The basic operation and effect of the speaker unit of the present embodiment configured as described above are as follows:
The embodiment is exactly the same as the embodiment.

Further, in the present embodiment, since the coupling cone 108 is attached near the position of the node of the primary high frequency resonance frequency of the diaphragm 107, the peak of the primary high frequency resonance frequency does not occur. The reproduction frequency band can be expanded to the secondary high frequency resonance frequency. The first-order high-frequency resonance frequency of the diaphragm 107 according to the present embodiment is 1.5 kHz, but the second-order high-frequency resonance frequency is 5 kHz, and the reproduction frequency band can be expanded to this level.

In this embodiment, the position where the coupling cone is attached to the diaphragm is smaller than the diameter of the voice coil. However, as in the tenth embodiment to be described next, this is used as the voice coil. It can also be larger than the diameter.

Further, although the characteristic correction piece is attached to the diaphragm in the present embodiment, for example, if the position of attaching the diaphragm of the coupling cone and the position of the node of the first high-range resonance frequency of the diaphragm coincide with each other, this is especially true. Not necessary.

Needless to say, the present invention is not limited to the above-described examples.

(Embodiment 10) FIG. 12 shows the first embodiment of the present invention.
It is a structural diagram of the speaker unit of the embodiment of 0. The speaker unit of this embodiment also has a diameter of 12 cm, and includes a frame 112, a terminal board 114, an edge 116,
The diaphragm 117 has the same configuration as that of the eighth embodiment shown in FIG. 10, and therefore description thereof will be omitted.

Reference numeral 111 denotes an inner magnet type field portion. 111a
Is a magnet, outer diameter is 40 mm, inner diameter is 22 m
m, the thickness is 7 mm, and the material is ferrite. 111b
Is a yoke, the thickness is 2 mm, and the material is iron. 11
1c is a plate with an outer diameter of 45 mm and an inner diameter of 24 m
m, the thickness is 4 mm, and the material is iron. 111d is a magnetic gap having an inner diameter of 45 mm and an outer diameter of 49.1 mm.

Reference numeral 111e designates a damper amplitude movable range space, to which the inner peripheral holes of the plate 111c and the magnet 111a are applied, as in the embodiment other than FIG.

Reference numeral 113 is a voice coil having a maximum outer diameter of 48.4 mm. 113a is a voice coil bobbin with an inner diameter of 45.48 mm and a material of 0.05 mm
Of aluminum. Reference numeral 113b is a voice coil lead wire (also known as tinsel wire).

Reference numeral 115 is a damper, and the diameter of the fixed end is 2
The height is 4 mm, the corrugation height is 2 mm, and the material is cotton cloth. 115a is a movable end of the damper.

Reference numeral 118 is a coupling cone, which is a paper having an outer diameter of 58 mm, an overall height of 10 mm, and a material of 0.5 mm. A fitting portion with the voice coil bobbin 113a is provided at a position having a diameter of 46 mm. Diaphragm 1
The mounting position of the diaphragm 17 has an average diameter of 57 mm, and is the position of the node of the first high-range resonance frequency of the diaphragm 117.

In this embodiment, the elastic body 119 is provided between the coupling cone 118 and the vibration plate 117. The elastic body 119 has an outer diameter of 58 mm and an inner diameter of 56 m.
m, the material is butyl rubber having a thickness of 1 mm.

The basic operation and effect of the speaker unit of the present embodiment configured as above are as follows.
The embodiment is exactly the same as the embodiment.

Further, in this embodiment, since the elastic body 119 is provided between the coupling cone 118 and the vibration plate 117, the sound pressure level in the high frequency range can be sharply attenuated, and it is exclusively for the low frequency reproduction. Suitable characteristics can be obtained.

In this embodiment, the coupling cone is attached to the position of the node of the first high resonance frequency of the diaphragm, but it is not always necessary to do so in some cases.

Needless to say, the present invention is not limited to the above-described examples.

[0134]

As described above, according to the present invention, the field magnet portion is of the inner magnet type, the damper is arranged on the inner peripheral side of the field portion magnetic gap, and the damper amplitude movable range space is set to the field portion. Of the damper, the movable end of the damper is the inner peripheral part of the damper, and the vibration system part attached to the movable end of the damper is the central part of the diaphragm. Since it is not necessary to provide the amplitude space, the speaker unit can be made thinner.

Further, since the distance from the rolling center point to the lower end of the voice coil is greatly shortened, even if rolling occurs, the horizontal deflection of the lower end of the voice coil becomes small, which causes abnormal contact with the field magnet. It is possible to prevent the generation of sound, and obtain the effect of enabling high sound pressure reproduction.

Further, the field magnet portion is of the inner magnet type, the damper is arranged on the inner peripheral side of the magnetic gap of the field portion, the damper amplitude movable range space is the inner peripheral hole of the field portion, and the damper movable end is By using the damper outer peripheral portion and the vibration system portion attached to the movable end of the damper as the central portion of the diaphragm, it is possible to obtain the effect of reducing the thickness and eliminating abnormal noise due to rolling similarly.

Further, the field magnet portion is of the outer magnet type, the damper is arranged on the inner peripheral side of the field portion magnetic gap, the damper amplitude movable range space is provided on the top of the yoke pole, and the damper movable end is formed on the inner peripheral portion of the damper. Since the vibration system part attached to the movable end of the damper is the central part of the diaphragm, the magnet can be arbitrarily enlarged without being restricted by the diameter of the voice coil, so that the efficiency of the speaker unit can be easily increased. The effect of being able to be obtained is obtained.

By setting the vertical position of the movable end of the damper to be lower than the vertical position of the fixed end of the damper,
When the movable end of the damper is displaced downward, the tension is generated faster than when it is displaced upward, so that the movable end of the damper is displaced downward and the lower end of the voice coil hits the bottom surface of the yoke. It is possible to prevent the occurrence of noise, and it is possible to obtain an effect that abnormal noise does not occur even if an excessive input is input.

Further, since the field plate is bent upward in the magnetic gap portion, the plate can be made of a thin material, so that the cost and weight of the speaker unit can be reduced. To be Further, by making the diameter of the fixed end portion of the damper larger than the inner diameter of the plate, it is possible to obtain the effect that the linearity characteristic and the reliability can be improved.

Further, a coupling cone for connecting the top of the voice coil bobbin, the damper movable end and the diaphragm is provided, and the central portion of the coupling cone is attached to the damper movable end, so that the diaphragm can be easily attached to the coupling cone. Since the positioning accuracy is unnecessary, the effect that the mass productivity of the speaker unit can be improved can be obtained.

The coupling cone is connected to the first part of the diaphragm.
By installing near the position of the node of the next high frequency resonance frequency, the effect that the reproduction frequency band can be expanded to the second high frequency resonance frequency without generating the peak of the first high frequency resonance frequency of the diaphragm. To be

Further, by providing an elastic body between the coupling cone and the diaphragm, it is possible to obtain an effect that the high frequency band can be sharply attenuated.

As described above, the present invention has extremely great practical value.

[Brief description of drawings]

FIG. 1 is a structural diagram of a speaker unit according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a first action and effect of the speaker unit according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram of a second action and effect of the speaker unit according to the first embodiment of the present invention.

FIG. 4 is a structural diagram of a speaker unit according to a second embodiment of the present invention.

FIG. 5 is a structural diagram of a speaker unit according to a third embodiment of the present invention.

FIG. 6 is a structural diagram of a speaker unit according to a fourth embodiment of the present invention.

FIG. 7 is a structural diagram of a speaker unit according to a fifth embodiment of the present invention.

FIG. 8 is a structural diagram of a speaker unit according to a sixth embodiment of the present invention.

FIG. 9 is a structural diagram of a speaker unit according to a seventh embodiment of the present invention.

FIG. 10 is a structural diagram of a speaker unit according to an eighth embodiment of the present invention.

FIG. 11 is a structural diagram of a speaker unit according to a ninth embodiment of the present invention.

FIG. 12 is a speaker according to a tenth embodiment of the present invention.
Kaunit structure diagram

FIG. 13 is a structural diagram of a conventional speaker unit.

FIG. 14 is a structural diagram of a conventional speaker unit.

FIG. 15 is an explanatory diagram of the first problem of the conventional speaker unit.

FIG. 16 is an explanatory diagram of a second problem of the conventional speaker unit.

[Explanation of symbols]

 1 field part 1a magnet 1b yoke 1c plate 1d magnetic gap 1e damper amplitude movable range space 2 frame 3 voice coil 3a voice coil bobbin 3b voice coil lead wire 4 terminal plate 5 damper 5a damper movable end 6 edge 7 diaphragm

Claims (9)

[Claims] 1. A magnetic field inside the magnetic field gap, comprising: a damper arranged on an inner circumferential side of the magnetic field gap; and a magnetic field section provided with the damper amplitude movable range space below the damper. A speaker unit characterized in that a vibration system portion other than a voice coil bobbin located in the vertical direction is attached to a movable end of the damper to support the vibration system, and a damper supporting the vibration system is not attached to the voice coil bobbin. 2. A vibration system part attached to a movable end of a damper, wherein the field part is an inner magnet type, the damper amplitude movable range space is an inner peripheral hole of the field part, and the movable end of the damper is an inner peripheral part of the damper. The speaker unit according to claim 1, wherein is the center of the diaphragm. 3. A vibrating system part attached to the damper movable end, wherein the field part is an inner magnet type, the damper amplitude movable range space is an inner peripheral hole of the field part, the damper movable end is an outer peripheral part of the damper. The speaker unit according to claim 1, wherein the speaker unit is provided at a central portion of the diaphragm. 4. A field magnet part is an outer magnet type, a damper amplitude movable range space is provided on a yoke pole top part, a damper movable end is an inner peripheral part of the damper, and a vibration system part attached to the damper movable end is a diaphragm. The speaker unit according to claim 1, wherein the speaker unit is provided in a central portion. 5. The speaker unit according to claim 2, wherein the vertical position of the movable end of the damper is lower than the vertical position of the fixed end of the damper. 6. The speaker unit according to claim 2, wherein the field plate has a shape bent in the vertical direction in the magnetic gap portion. 7. A coupling cone for connecting the top of the voice coil bobbin, the movable end of the damper and the vibration plate to each other, and a central portion of the coupling cone is attached to the movable end of the damper. 5. The speaker unit described in 5. 8. The speaker unit according to claim 7, wherein the coupling cone is attached near the position of the node of the first high resonance frequency of the diaphragm. 9. The speaker unit according to claim 7, wherein an elastic body is provided between the coupling cone and the diaphragm.