JPH11225388A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the degree of freedom of design, mounting characteristic and acoustic characteristic by tightly attaching a hollow housing that form a 1st opening in front to the front of a speaker unit and setting the angle made between the center axis of the speaker unit and the longitudinal direction axis of the housing within a specific range. SOLUTION: A hole part 22a whose diameter is about 100 to 160 mm is formed at the center of a back plate 22 of the front of a speaker unit 11 and two almost trapezoidal side walls 23 almost parallelly extend from opposite edges 22b. Two almost rectangular plate-shaped side walls 24 extend from the other opposite edges 22c in such a manner that they approach each other as they extend forward and a rectangular opening part 25 whose slit interval t is about 20 to 30 mm is formed at a front end. The unit 11 is tightly attached to the back plate 22 with an angle α that is made between its center axis 11m and the longitudinal direction axis 26 of a housing 21 within the range of 0<α<90 deg.C. Thus, it is possible to inexpensively suppress the generation of a standing wave and to prevent the sound pressure of a specific frequency from decreasing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker, and more particularly, to a loudspeaker unit installed in a door, inner panel or the like of an automobile, for guiding and radiating sound generated from the loudspeaker unit into a vehicle interior. And a speaker having a speaker grille.

[0002]

2. Description of the Related Art In recent years, in order to increase the directivity of sound generated by a speaker unit or to improve the attachment of the speaker unit to a door or an inner panel,
2. Description of the Related Art A speaker in which a substantially cylindrical housing is attached to the front of a speaker unit has been proposed.

FIGS. 12A and 12B are schematic diagrams schematically showing a conventional speaker provided with a housing for expanding the directivity of this kind of sound, wherein FIG. 12A is a partial cross-sectional side view, and FIG. It is BB sectional drawing in a). A substantially cylindrical pole piece 11b is attached to the front side of the center portion of the substantially disk-shaped yoke plate 11a, and a magnet 11c is disposed around the pole piece 11b in a concentric manner. Magnet 1
1c, a frame 1 is provided on a front portion via a top plate 11d.
1e is attached, and a substantially ring-plate-shaped flange portion 11f is integrally formed at a front portion of the frame 11e.
On the other hand, a substantially cylindrical voice coil 11g is provided around the pole piece 11b.
Is supported by a rear portion of the frame 11e via a damper 11h so as to be able to vibrate in the front-rear direction. One end of a diaphragm 11i having a substantially hollow inverted truncated cone shape is attached to the front of the voice coil 11g.
j, which is attached to the flange portion 11f via a gasket 11k, and a cap 11n having a substantially hemispherical shape is mounted on the base of the diaphragm 11i. These yoke plate 11a, pole piece 11b, magnet 11c,
Frame 11e, flange 11f, voice coil 11
g, the diaphragm unit 11i and the like constitute the speaker unit 11.

A substantially rectangular rear plate portion 92 is disposed in front of the speaker unit 11, and a substantially circular hole portion 92a is formed in the center of the rear plate portion 92. Rear plate 92
Two substantially trapezoidal side walls 93 extend substantially in parallel from the opposite end 92b, and two substantially rectangular plate-like side walls 94 extend forward from the other opposite end 92c. They extend in such a manner that they approach each other as they travel.
The side end portions of the side wall portions 93 and 94 are integrally joined, and an elongated substantially rectangular opening 95 is formed at the front end portion of the side wall portions 93 and 94. These rear plate portions 92,
The housing 91 is configured to include the side walls 93 and 94, the opening 95, and the like.

[0005] The front part of the housing 91 is, for example, a door inner plate 1 of an automobile.
2b, the gasket 11k of the speaker unit 11 and the edge 11
j is inserted, and a flange 11f of the speaker unit 11 is attached to the rear plate 92 of the housing 91.
The central axis 11m of the speaker unit 11 and the housing 9
One longitudinal axis 96 is set so as to be substantially straight (an angle between the central axis 11m and the longitudinal axis 96 is 0 °). The speaker 90 includes the speaker unit 11 and the housing 91.

In the speaker 90 configured as described above,
When a drive current from a main amplifier (not shown) is applied to the voice coil 11g, the voice coil 11g is driven at the same frequency as the change in the drive current and vibrates, and this vibration propagates to the diaphragm 11i and vibrates. The air in front of the plate 11i is vibrated, and a sound is generated. Then, the sound propagates in the housing 91 while being guided between the side walls 94 that are gradually narrowed, and a sound with a wide directivity is radiated into the vehicle interior through the elongated opening 95.

However, in the above-described speaker 90, the distance L ₁ from the door inner plate 12b to the rear end of the speaker 90, the height H ₁ from the position of the opening 95 to the upper end of the speaker 90, and the housing since the width W ₁ of 91 is relatively large, when mounted to the door inner plate 12b of an automobile, easy contact with the lowered come window glass. Further, when the glass elevating means and the like are arranged in a door (both not shown) or the like, they are easily obstructed, there are many restrictions on the design, and there is a problem that the mountability is poor.

FIGS. 13A and 13B are schematic views schematically showing a conventional loudspeaker in which such attachment is improved, wherein FIG. 13A is a partial sectional side view and FIG. 13B is a plan view. The rear plate portion 102 is formed in a substantially rectangular plate shape, and two substantially trapezoidal side walls 103 are formed from opposite ends 102 b of the rear plate portion 102.
A substantially round hole 104 a is formed at a predetermined position of the side wall 103. Further, from the other opposite end 102c of the rear plate 102, two side walls 105 each having a substantially rectangular plate shape are extended in a manner of expanding toward each other as going forward. The side end portions of the side wall portions 103 to 105 are integrally connected, and an elongated substantially rectangular opening 106 is formed at the front end portion of the side wall portions 103 to 105.
These rear plate portion 102, side wall portions 103 to 105, opening portion 1
The housing 101 is configured so as to include, for example, 06.

A front portion of the housing 101 is attached to the door inner plate 12b, while a gasket and an edge (not shown) of the speaker unit 11 are inserted into a hole 103a of the housing 101. The flange portion 11f of the speaker unit 11 is attached to the portion 103. The central axis 11m of the speaker unit 11 and the housing 10
The angle α between the first longitudinal axis 107 and the longitudinal axis 107 is about 90 °. The speaker 100 includes the speaker unit 11 and the housing 101. In the speaker 100 thus configured, the distance L ₂ from the door inner plate 12b to the rear end of the speaker 100, the height H ₂ from the position of the opening 910 to the upper end of the speaker 100, and the width W ₂ of the housing 101 is relatively small, design constraints are reduced, the mounting is improved.

[0010]

In the conventional speaker 90 described above, the width W ₁ , the height H ₁ ,
The distance L ₁ is relatively large, when attached to the car door and the inner panel, window glass, glass elevating means, tends to be disturbed by the installation of such switch gauges,
There are many restrictions on the design and the mounting is inferior. In addition, since it is difficult to freely change the length L ₀ of the housing 91, it is difficult to correct and recover a decrease in sound pressure at a specific frequency held by the speaker unit 11 by adjusting the length L _0. was there.

Further, in the speaker 100, the mounting property is improved, while the center axis 1 of the speaker unit 11 is
Angle α between 1 m and longitudinal axis 107 of housing 101
Is as large as about 90 °, there is a problem that the sound pressure of the high-frequency components of the sound radiated from the opening 106 tends to decrease.

In the speakers 90 and 100, the opposing side walls 93 and the side walls 103 and 104 are parallel planes, respectively.
The reflected sounds interfere with each other between 3 and 104, and a standing wave is easily generated. At this time, if an abdomen of the standing wave is generated near the speaker unit 11, the diaphragm 11i resonates and its amplitude becomes abnormally large, while if a node of the standing wave is generated, the vibration of the diaphragm 11i is reduced. There is a problem that peaks and valleys are likely to occur in the sound pressure frequency characteristics because they are suppressed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and can improve the degree of freedom of design, improve the mountability, suppress the generation of standing waves, and reduce the sound pressure at a specific frequency. It is an object of the present invention to provide a speaker that can prevent noise and improve acoustic characteristics and reduce costs.

[0014]

In order to achieve the above object, a speaker according to the present invention has a hollow housing closely attached to a front part of a speaker unit, and a front part of the housing. Wherein the angle α between the central axis of the speaker unit and the longitudinal axis of the housing is set in the range of 0 ° <α <90 °. (1).

According to the above speaker (1), the angle α between the central axis of the speaker unit and the longitudinal axis of the housing is set in the range of 0 ° <α <90 °. When installed in a door inner plate or an inner panel of an automobile, the distance from the door inner plate or the inner panel to the flange end of the speaker (1) is relatively short, or The distance from the central axis to the end of the flange can be set relatively long to approach the door inner plate and the inner panel.As a result, design restrictions can be reduced, and window glass, Installation of the glass lifting / lowering means, instruments, and the like is facilitated, and the mountability can be improved. At the same time, a decrease in sound pressure at a high frequency range can be suppressed, and the directivity can be widened, so that sound having excellent acoustic characteristics can be reliably emitted from the first opening.

The speaker according to the present invention is characterized in that, in the speaker (1), the housing is configured to include a flat side wall, and the shape of the first opening is rectangular. (2).

According to the above-mentioned speaker (2), since the housing is configured to include the flat side wall and the first opening is rectangular, the structure is relatively simple. Thus, the length of the longitudinal axis and the angle α in the housing can be accurately set to appropriate values, and the manufacturing cost can be reduced.

The speaker according to the present invention is characterized in that, in the speaker (2), the side walls constituting the housing are not opposed to each other in parallel (3).

According to the above speaker (3), since the side walls constituting the housing do not face each other in parallel, sound is repeatedly reflected between the side walls and the reflected sound is mutually reflected. The occurrence of a standing wave due to interference with the sound pressure can be suppressed, and as a result, the occurrence of peaks and valleys in the sound pressure frequency characteristic can be reliably prevented.

The speaker according to the present invention, in any one of the speakers (1) to (3), includes the first opening on one side wall near the first opening in addition to the first opening. A second opening similar to the opening is formed, and a lid for closing any of the openings is provided (4).

According to the above-mentioned speaker (4), even when the internal structure or the position of parts in the door or the inner panel of the automobile changes, the first opening and the second
By closing one of the openings with the lid, sound can be reliably taken out in an appropriate direction. As a result,
Even if the type of the housing is reduced, it is possible to cope with the case, and the cost can be reduced.

Further, in the speaker according to the present invention, in the speaker (1), the casing may include a curved side wall portion, and the first opening may have an elliptical shape. (5).

According to the above-mentioned speaker (5), since the housing is configured to include the curved side wall portion and the shape of the first opening is an elliptical shape, the inside of the side wall portion is formed. The sound can be prevented from being repeatedly reflected, and the same effect as that of the speaker (3) can be obtained. Also, the occupied volume of the housing can be reduced,
The attachment can be further improved.

In the speaker according to the present invention, in any one of the speakers (1) to (5), a frequency at which a sound pressure of a sound pressure frequency characteristic of the speaker unit is low, and a resonance frequency at which air in the housing resonates. (6), wherein the length of the longitudinal axis of the housing is set so as to coincide with (6).

According to the above-mentioned speaker (6), f is the resonance frequency at which the air in the housing resonates, c is the sound speed, L is the length of the longitudinal axis of the housing, n = 1,2, 3, ...
Then, there is a relationship of f = c · (2n−1) / 4L,
The length L of the housing in the longitudinal direction such that the frequency at which the sound pressure of the sound pressure frequency characteristic of the speaker unit is low matches the resonance frequency f at which air in the housing resonates.
Is set, the decrease in sound pressure at the specific frequency can be recovered by the resonance of air in the housing, and the sound pressure frequency characteristics can be reliably flattened.

Further, in the speaker according to the present invention, in any one of the speakers (1) to (6), the housing is divided into at least two parts, and the other housing part slides on one of the divided housing parts. It is characterized in that it is movably inserted and the casings are fixed to each other via a fixing member (7).

According to the above-mentioned speaker (7), the length of the longitudinal axis of the housing can be adjusted accurately and easily, and the flattening of the sound pressure frequency characteristic can be more reliably achieved. it can.

In the speaker according to the present invention, in any one of the speakers (1) to (7), an opening is formed in one side wall of the housing, and a diaphragm having a predetermined weight is provided in the opening. It is characterized in that it is supported via an elastic member having an elastic coefficient (8).

Assuming that the frequency resonating by the sound propagating in the housing is f ₀ , the weight of the diaphragm is M, and the elastic modulus is C, the relationship f ₀ = (1 / M · C) ^1/2 / 2π. According to the loudspeaker (8), since the diaphragm having the weight M is supported in the opening via the elastic member having the elastic coefficient C, the weight M and the elastic coefficient C are determined. If the resonance frequency f ₀ is adjusted so as to be lower than, for example, the reproduction limit of the speaker, the sound pressure in the low frequency range can be reliably increased.

The speaker according to the present invention is characterized in that in any of the speakers (1) to (8), a partition member having air permeability is attached to the inside of the housing (9).

According to the above-mentioned speaker (9), since a partition member having air permeability is attached to the inside of the housing, sound can be radiated outward through the partition member. The member can prevent foreign substances from entering the inside of the housing and damaging the diaphragm and the like of the speaker unit. Further, a ticket or the like can be stored inside the housing.

The speaker according to the present invention is characterized in that a sound guiding portion and a speaker grill having a rectangular or oval opening are attached to the front of the speaker unit (10).

According to the above-mentioned speaker (10), since the speaker grille having the sound guiding portion and the rectangular or oval opening is attached to the front of the speaker unit, the sound generated by the speaker unit is generated. Vibration is guided along the guide portion, and a wide directional sound can be radiated from the rectangular or oval opening, and the speaker unit is protected by the speaker grille having excellent appearance. can do.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a speaker according to the present invention will be described below with reference to the drawings. Note that components having the same functions as those of the conventional example are denoted by the same reference numerals. FIG. 1 is a schematic diagram schematically showing a speaker according to Embodiment (1), (a) is a partial cross-sectional side view, and (b)
FIG. 3 is a sectional view taken along line BB in FIG. FIG. 2 is a perspective view schematically showing a housing of the speaker according to Embodiment (1). The speaker unit 11 has the same configuration as that shown in FIG. 13. A substantially rectangular rear plate portion 22 is provided in front of the speaker unit 11, and the diameter of the rear plate portion 22 is approximately at the center of the rear plate portion 22. D is about 100-160mm
Is formed. Two substantially trapezoidal side walls 23 extend substantially in parallel from the opposite end 22b of the rear plate 22, and two substantially rectangular plate-like side walls extend from the other opposite end 22c. The sections 24 extend in a manner to approach each other as going forward. Side wall 2
The side end portions of the side walls 3 and 24 are integrally connected, and the front end portions of the side wall portions 23 and 24 have a slit interval t of about 20 to 3.
An opening 25 having a substantially rectangular shape of 0 mm is formed. These rear plate portion 22, side wall portions 23 and 24, opening portion 25
The housing 21 is configured to include the resin material such as polypropylene or ABS by an injection molding method or the like.

The gasket 11k and the edge 11j (FIG. 12) of the speaker unit 11 are inserted into the hole 22a of the housing 21, and the flange 11f of the speaker unit 11 comes into close contact with the rear plate 22 of the housing 21. Installed. The angle α between the central axis 11m of the speaker unit 11 and the longitudinal axis 26 of the housing 21 is 0 ° <α <
The angle is set to a predetermined angle in a range of 90 °. The speaker 20 includes the speaker unit 11 and the housing 21.

FIG. 3 is a cross-sectional view schematically showing a door portion of an automobile to which the speaker according to the embodiment (1) is attached. In the drawing, reference numeral 12a denotes a door outer plate. A door inner plate 12b is mounted inside the door outer plate 12a, and a window glass 12d is disposed between the upper portion of the door outer plate 12a and the upper portion of the door inner plate 12b so as to be slidable in the vertical direction. Reference numeral 12d is adapted to be driven up and down via a glass elevating means 12e. A door trim 12c is attached to the door inner plate 12b in the direction of the arrow in the figure. These door outer plate 12a, door inner plate 12b, door and rim 12c, window glass 12
d, the door 12 is configured to include the glass elevating means 12e and the like. When the speaker 20 is mounted in the door 12 configured as described above, after inserting the opening 25 into a hole 12f formed at a predetermined position of the door inner plate 12b, the speaker 20 is connected to the inside of the door via the mounting part 27. It is fixed to the plate 12b. Next, after the speaker grill 28 is attached to the hole 12g, the door trim 12c is fixed to the door inner plate 12b, and the attachment of the speaker 20 is completed.

As is apparent from the above description, the speaker 20 according to the embodiment (1) has the speaker unit 11
Is set within the range of 0 ° <α <90 °, the angle α between the central axis 11m and the longitudinal axis 26 of the housing 21 is set in the range of 0 ° <α <90 °. relatively short setting the distance L _a from the plate 12b to the flange portion 11f ends of the speaker 20 can be brought close to the door inner plate 12b, with the result, it is possible to reduce restrictions on the design, the window The installation of the glass 12d, the glass lifting / lowering means 12e, and the like is facilitated, and the mountability can be improved. At the same time, a decrease in sound pressure at a high frequency range can be suppressed, and the directivity can be expanded, so that sound having excellent acoustic characteristics can be reliably emitted from the opening 25.

Further, the housing 21 has flat side walls 23, 2
4 and the shape of the opening 25 is rectangular, so that the structure is relatively simple,
The length _LB and the angle α of the lengthwise axis 26 can be accurately set to appropriate values, and the manufacturing cost can be reduced.

Further, the longitudinal axis 26 of the housing 21 is adjusted so that the frequency of the low sound pressure of the sound pressure frequency characteristic of the speaker unit 11 matches the resonance frequency f at which the air in the housing 21 resonates. since the length L _B is set, it is possible to sound pressure decrease in the specific frequency can be recovered by the resonance of the air in the housing 21, ensuring flattening of sound pressure frequency characteristics.

FIGS. 4A and 4B are schematic diagrams schematically showing the speaker according to the embodiment (2), wherein FIG. 4A is a partial cross-sectional side view, and FIG. 4B is a cross-sectional view taken along line BB in FIG. It is. A substantially square rear plate portion 3 is provided in front of the speaker unit 11.
2 is provided, and a hole 32 a having a diameter of D is formed at the center of the rear plate 32. Two substantially trapezoidal side walls 33 extend from both end portions 32b of the rear plate portion 32 in such a manner as to gradually move away from the front plate 32, and have a substantially inverted trapezoidal shape from the other end portions 32c. The two side wall portions 34 extend so as to approach each other as going forward. Side end portions of the side wall portions 33 and 34 are integrally connected, and an opening portion 35 having a substantially rectangular shape with a slit interval t is formed at a front end portion of the side wall portions 33 and 34. These rear plate portion 32, side wall portions 33 and 34, opening portion 35
The housing 31 is configured to include the components shown in FIG.
In the same manner as described above, it is formed using a resin material by an injection molding method or the like. Further, a partitioning member 37 such as a punching net having a plurality of holes 37a is attached to a predetermined location inside the housing 31.
Thereby, air permeability between the housings 31 sandwiching the partition member 37 is ensured.

As in the case shown in FIG. 1, the housing 31 is attached in close contact with the flange 11f of the speaker unit 11, and the central axis 11m of the speaker unit 11 is provided.
And the angle α between the housing 31 and the longitudinal axis 36 is 0 °.
The predetermined angle is set in the range of <α <90 °. The speaker 30 includes the speaker unit 11, the housing 31, and the partition member 37.

FIG. 5 is a cross-sectional view schematically showing the vicinity of an inner panel of an automobile to which the speaker according to the embodiment (2) is attached. In FIG. 5, reference numeral 14 denotes a cowl.
A curved inner panel 13 is attached to the cowl 14, a windshield 15 is attached to an upper end of the inner panel 13, and a handle 16 is provided behind the inner panel 13. Inner panel 1
A switch / instrument 17 and the like are provided in the inside 3, and a hole 13 a used for blowing out an air conditioner or the like is formed in the upper part of the inner panel 13 near the windshield 15. When the speaker 30 is mounted inside the inner panel 13 configured as described above, the opening 35 is inserted into the hole 13a, and the speaker 30 is fixed via the mounting part 38.
The speaker 30 is installed inside.

As is apparent from the above description, the speaker 30 according to the embodiment (2) has the speaker unit 11
Is set in the range of 0 ° <α <90 °, the opening α is formed between the central axis 11m of the housing 31 and the longitudinal axis 36 of the housing 31 in the inner panel 13 of the automobile. Flange 11f of speaker 30 from the central axis of 35
The distance L _C to the end can be set relatively long to approach the inner panel 13, thereby reducing design restrictions and simplifying the installation of switches and instruments 17. In addition, the mounting property can be improved. At the same time, a decrease in sound pressure at a high frequency range can be suppressed, and the directivity can be expanded, so that sound having excellent acoustic characteristics can be reliably emitted from the opening 35.

The side walls 33, 3 constituting the casing 31
4 do not face each other in parallel,
It is possible to prevent the sound from being repeatedly reflected between the light sources 34 and the reflected sounds from interfering with each other to generate a standing wave. As a result, it is possible to reliably prevent the occurrence of peaks and troughs in the sound pressure frequency characteristic. can do.

Further, since the partition member 37 having air permeability is attached to the inside of the housing 31, the partition member 37 is provided.
Sound can be radiated outward through the partition member 37, while the partition member 37 can prevent foreign substances from entering the inside of the housing 31 and damaging the diaphragm 11 i and the like of the speaker unit 11. A ticket 39 is provided inside the housing 31.
(FIG. 5) can also be stored.

FIG. 6 is a perspective view schematically showing a housing of the speaker according to the embodiment (3). In the drawing, reference numeral 22 denotes a rear plate portion. As shown in FIG. 1, two substantially trapezoidal side walls 43 are formed from both ends 22b of the rear plate 22.
Are extended substantially parallel to each other, and two side wall portions 44 each having a substantially rectangular plate shape are extended from the other end portions 22c so as to approach each other as going forward. Side wall 43,
44 are integrally connected to each other, and
Two openings 45a and 45b each having a substantially rectangular shape and different opening directions are formed adjacent to each other at the front ends of the members 3 and 44. One lid 45c is provided in the openings 45a and 45b. When the lid 45c is inserted in the direction of the arrow in the drawing, one of the openings 45a and 45b is closed. . The other configuration is substantially the same as that shown in FIG. 1, and therefore a detailed description of the configuration is omitted here. These rear plate portion 22 and side wall portion 4
The housing 41 is configured including 3, 44, openings 45a and 45b, a lid 45c, and the like.

The housing 41 is attached to the flange portion 11f (both shown in FIG. 1) of the speaker unit 11 in close contact therewith.
An angle α (FIG. 1) and the longitudinal axis of the housing 41 (both not shown) is set to a predetermined angle in a range of 0 ° <α <90 °. These speaker unit 11 and housing 4
1 is included in the speaker according to the embodiment (3).

As is apparent from the above description, according to the loudspeaker according to the embodiment (3), even if the internal structure or the position of the parts in the door or the inner panel of the automobile is changed, either of the openings 45a and 45b is changed. If one of them is closed by the lid 45c, the sound can be reliably taken out in an appropriate direction. As a result, even if the type of the housing 41 is reduced, it is possible to cope with the case 41 and reduce the cost.

In the loudspeaker according to the embodiment (3), the case where the side walls 43 are opposed to each other in parallel has been described, but in another embodiment, the same as that shown in FIG. It is not necessary that the side wall portions 43 face each other in parallel.

FIG. 7 is a perspective view schematically showing a housing of the speaker according to the embodiment (4). In the drawing, reference numeral 52 denotes a rear plate portion. The rear plate portion 52 has a substantially disk shape, and a hole 52a having a diameter D is formed in the center of the rear plate portion 52. From the periphery of the rear plate portion 52, a cylindrical side wall portion 53 is formed.
Is formed so as to be gradually crushed as it goes forward, and a substantially oval opening 55 with a slit interval t is formed at the front end of the side wall 53.
The housing 51 is configured to include the rear plate portion 52, the side wall portion 53, the opening 55, and the like. The housing 51 is formed using a resin material by, for example, an injection molding method or the like.

The housing 51 is attached in close contact with a flange portion 11f of the speaker unit 11 (both shown in FIG. 1).
(FIG. 1) and the angle α between the longitudinal axis 56 of the housing 51
(Not shown) is set to a predetermined angle in the range of 0 ° <α <90 °. These speaker unit 11 and housing 5
1 is included in the speaker according to the embodiment (4).

As is apparent from the above description, in the loudspeaker according to the embodiment (4), the housing 51 is configured to include the curved side wall 53 and the opening 55 is oblong. Thus, the sound can be prevented from being repeatedly reflected in the side wall portion 53, and the same effect as in the case of the speaker 30 shown in FIGS. 4 and 5 can be obtained. Further, the occupied volume of the housing 51 can be reduced, and the mounting performance can be further improved.

FIG. 8 is a partial sectional side view schematically showing the speaker according to the embodiment (5), in which 22 indicates a rear plate portion. Rear plate 22 similar to that shown in FIG.
A hole portion 22a is formed in the rear plate portion 22. A substantially rectangular cylindrical side wall portion 63 extends from an end of the rear plate portion 22. The housing portion 61a includes the side wall portion 63, the rear plate portion 22, and the like. Is configured. Around the side wall 63, a substantially square cylindrical side wall 6 is provided.
4 are slidably disposed, and two substantially trapezoidal side walls 65a extend in parallel from the front end 64a of the side wall 64 so as to face each other, and another front end 64b of the side wall 64 is provided. , Two opposing side wall portions 65b each having a substantially rectangular plate shape are extended so as to gradually approach each other, and the side wall portions 65a, 65
A substantially rectangular opening 66 is formed at the front end of b. These side walls 64, 65 a, 65 b and opening 66
The housing portion 61b is configured to include the above. Case 61
a and 61b are fixed via fixing members 61c such as screws, and the housing 61 is configured to include these housing portions 61a, 61b and the fixing member 61c.

The housing 61 is attached in close contact with the flange 11f of the speaker unit 11, and has a central axis 11m of the speaker unit 11 and a longitudinal axis 6 of the housing 61.
7 is set in the range of 0 ° <α <90 °. The speaker 60 includes the speaker unit 11 and the housing 61.

[0055] As apparent from the above description, the speaker 60 according to the embodiment (5), the length L _B of the longitudinal axis 67 of the housing 61 can be adjusted accurately and easily,
The flattening of the sound pressure frequency characteristics can be achieved more reliably.

In the loudspeaker according to the embodiment (5), the case where the side walls 65a are opposed to each other in parallel has been described. However, the side wall 63 and the side wall 64 each having a substantially rectangular cylindrical shape are partially provided. For example, as shown in FIG.
May not be opposed in parallel. Also, the curved casing 51 shown in FIG. 7 is divided into two parts in the front-rear direction, the cylindrical parts are formed in these divided parts, and the other cylindrical part is slidably inserted into one cylindrical part. It may be.

Further, in the loudspeaker according to the embodiment (5), the case where one opening 66 is provided has been described, but in another embodiment, two loudspeakers are provided as shown in FIG. Openings 45a and 45b may be formed.

FIG. 9 is a partial sectional side view schematically showing a speaker according to the embodiment (6), in which 22 indicates a rear plate portion. Two substantially trapezoidal side walls 73 extend substantially in parallel from both ends 22b of the rear plate 22, and a substantially rectangular plate-like side wall 74a and a substantially rectangular plate are bent from the other ends 22c. The side wall portion 74b having the given shape is extended so as to approach each other as it goes forward. The side ends of the side walls 73, 74a, 74b are integrally connected, and an opening 75 having a substantially rectangular shape is formed at the front end of the side walls 73, 74a, 74b. In a predetermined position of the side wall portion 74b, a substantially circular shape, an elliptical shape,
Alternatively, a rectangular opening 76a is formed, and the opening 7a is formed.
A diaphragm 76b having a weight M formed by using a resin material such as polypropylene or ABS is provided in 6a.
The diaphragm 76b is supported via an elastic member 76c having an elastic coefficient of C. The elastic member 76c is formed of a urethane foam resin material or the like, and is formed in a ring shape having a substantially inverted U-shaped cross section. The passive radiator 76 includes the opening 76a, the diaphragm 76b, and the elastic member 76c. The other configuration is substantially the same as that shown in FIG. 1, and therefore a detailed description of the configuration is omitted here. These rear plate portion 22, side wall portions 73, 74a, 7
The housing 71 includes the opening 4b, the opening 75, the passive radiator 76, and the like.

The housing 71 is attached in close contact with the flange portion 11f of the speaker unit 11, and has a central axis 11m of the speaker unit 11 and a longitudinal axis 7 of the housing 71.
7 is set to a predetermined angle in the range of 0 ° <α <90 °. The speaker 70 includes the speaker unit 11 and the housing 71.

As is clear from the above description, in the loudspeaker according to the embodiment (6), the frequency f ₀ that resonates with the sound propagating in the housing 71 is f ₀ = (1 / M · C)
^{When the} resonance frequency f ₀ is set so as to be lower than the reproduction limit of the speaker by adjusting the weight M of the diaphragm 76b and the elastic coefficient C of the elastic member 76c, for example, there is a relationship of ^1/2 / 2π. Can be reliably increased.

The speaker 7 according to the embodiment (6)
0, the case where the side wall portions 73 are opposed to each other in parallel has been described. However, in another embodiment, the side wall portions 73 are not opposed to each other in parallel as shown in FIG. Is also good. A passive radiator 76 may be formed on the curved side wall 53 shown in FIG.

The speaker 7 according to the embodiment (6)
In the case of 0, the case where the number of the opening 75 is one has been described,
In another embodiment, similar to that shown in FIG.
Two openings 45a and 45b may be formed.

FIG. 10 is a partial sectional perspective view schematically showing a speaker according to the embodiment (7), in which 11 indicates a speaker unit. A guiding portion 83 having a substantially Mt. Fuji external shape is provided in front of the speaker unit 11, and a substantially dome-shaped outer wall portion 84 is provided in front of the guiding portion 83 so as to cover the guiding portion 83. The outer wall 84 and the inner end of the guiding portion 83 are connected in a substantially elliptical shape.
A substantially ring-shaped flange portion 82 extends from an outer end of the guide portion 83. The speaker grill 81 is configured to include the flange portion 82, the guide portion 83, the outer wall portion 84, and the opening portion 85, and the speaker grill 81 is integrally formed using a resin material such as polypropylene or ABS.

The flange 82 of the speaker grill 81 is
The door trim 12c (FIG. 11), the inner panel, and the board portion (both not shown) of the rear tray are mounted on the flange portion 12f of the speaker unit 11, and the like.
The speaker 80 includes the speaker unit 11 and the speaker grill 81.

FIG. 11 is a partial sectional side view schematically showing a method of attaching the speaker according to the embodiment (7) to the door of an automobile, in which 12b and 12c are shown.
Indicates a door inner plate and a door trim, respectively. When the speaker 80 is mounted in the door configured as above, the speaker unit 11 is inserted into the hole 12f formed in the door inner plate 12b, and then the mounting parts 86 such as screws are inserted.
Fixed through. Next, the hole 12g of the door trim 12c
After the speaker grill 81 is attached to the door via a mounting part 87 such as a screw, the door trim 12c is pressed and fixed in the direction of the arrow in the figure to fix the speaker 80 to the door.

As is apparent from the above description, the speaker 80 according to the embodiment (7) has the speaker unit 11
A speaker grill 81 having a sound guiding portion 83 and an elliptical opening 85 is attached to the front of the speaker unit 81, so that the vibration generated from the speaker unit 11 is guided along the guiding portion 83, and the elliptical shape is obtained. Sound with a wide directivity can be radiated from the opening 85, and the speaker unit 11 can be protected by the speaker grill 81 having excellent appearance.

The speaker 8 according to the embodiment (7)
In the case of 0, the case where the opening 85 has an elliptical shape has been described, but a rectangular shape may be used in another embodiment.

The speaker 8 according to the embodiment (7)
0, the case where it is attached to the door has been described, but in another embodiment, it may be attached to an inner panel or the like.

[Brief description of the drawings]

FIG. 1 is a schematic diagram schematically showing a first embodiment of a speaker according to the present invention, in which FIG.
(B) is a sectional view taken along line BB in (a).

FIG. 2 is a perspective view schematically showing a speaker housing according to Embodiment (1).

FIG. 3 is a cross-sectional view schematically showing a door portion of an automobile to which the speaker according to Embodiment (1) is attached.

4A and 4B are schematic diagrams schematically showing a speaker according to Embodiment (2), wherein FIG. 4A is a partial cross-sectional side view, and FIG. 4B is a cross-sectional view taken along line BB in FIG. .

FIG. 5 is a cross-sectional view schematically showing the vicinity of an inner panel of an automobile to which a speaker according to Embodiment (2) is attached.

FIG. 6 is a perspective view schematically showing a speaker housing according to the embodiment (3).

FIG. 7 is a perspective view schematically showing a speaker housing according to Embodiment (4).

FIG. 8 is a partial sectional side view schematically showing a speaker according to Embodiment (5).

FIG. 9 is a partial cross-sectional side view schematically showing a speaker according to Embodiment (6).

FIG. 10 is a partial sectional perspective view schematically showing a speaker according to Embodiment (7).

FIG. 11 is a partial cross-sectional side view schematically illustrating a method of attaching the speaker according to the embodiment (7) to a door of an automobile.

12A and 12B are schematic views schematically showing a conventional speaker provided with a housing for expanding the directivity of sound, wherein FIG. 12A is a partial cross-sectional side view, and FIG. FIG. 4 is a cross-sectional view taken along line B.

FIG. 13 is a schematic view schematically showing a conventional speaker with improved mountability, wherein (a) is a partial cross-sectional side view,
(B) is a plan view.

[Description of Signs] 11 Speaker unit 11m Central axis 20 Speaker 21 Housing 25 First opening 26 Length axis

Claims (10)

[Claims] 1. A speaker in which a hollow housing is closely attached to a front portion of a speaker unit, and a first opening is formed in a front portion of the housing, wherein a center axis of the speaker unit is provided. And the angle α between the housing and the longitudinal axis of the housing is 0
A speaker characterized by being set in a range of ° <α <90 °. 2. The speaker according to claim 1, wherein the housing includes a planar side wall, and the first opening has a rectangular shape. 3. The loudspeaker according to claim 2, wherein said side walls constituting said housing do not face each other in parallel. 4. In addition to the first opening, a second opening similar to the first opening is formed in one side wall near the first opening, and each of the openings is formed. A lid portion for closing any one of the portions is provided.
3. The speaker according to any one of the items 3. 5. The speaker according to claim 1, wherein the housing includes a curved side wall portion, and the first opening has an elliptical shape. 6. The length of a longitudinal axis of the housing is set so that a frequency at which a sound pressure of a sound pressure frequency characteristic of the speaker unit has a low frequency matches a resonance frequency at which air in the housing resonates. 2. The setting is set.
6. The speaker according to any one of Items 5 to 5. 7. The casing is divided into at least two parts, the other casing part is slidably inserted into one of the divided casing parts, and the casing parts are connected via a fixing member. 2. The apparatus according to claim 1, wherein said apparatus is fixed.
7. The speaker according to any one of Items 6 to 6. 8. An opening is formed in one side wall of the housing, and a diaphragm having a predetermined weight is supported in the opening via an elastic member having a predetermined elastic coefficient. Item 7. The speaker according to any one of Items 1 to 7. 9. The air-permeable partition member is mounted inside the housing.
The speaker according to any one of the above items. 10. A speaker comprising a speaker grill having a sound guiding portion and a rectangular or oval opening at a front portion of the speaker unit.