JP2000023280A - Speaker device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To offset or attenuate reactive force generated by the radiating emission force of an air in a duct by fitting and fixing a bending duct which consists of plural ducts on a duct opening port dug at least on a side plate composing six surfaces of a box. SOLUTION: Both edges of a first duct 18 have opening ports 18a and 18b. A second duct 19 is joined in a vertical direction or a horizontal direction of this first duct 18 or at an inclining position. This bending duct is fitted to a periphery of the opening port 18a of the first duct 18 and is fixed in a hole (a square hole) 22 dug on a front side plate 2F. Thus, by accompanying to a sound pressure fluctuation in a space at the time of sound radiation of a speaker 3, an air flowing out of an opening port of the second duct 19 flows into the opening port 18b of the first duct 18 and is radiated outside a speaker box 2 from the opening port 18a. Therefore, the lightweight speaker box 2 does not receive reactive force at the time of sound radiation at the duct part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bass reflex (phase reversal baffle) type loudspeaker, and more particularly to a loudspeaker in which a duct for a bass reflex is lengthened so as to support the radiation force of air in the duct.

[0002]

2. Description of the Related Art Conventionally, as a sound emitting means, it has been proposed to extend the low frequency range of reproduced sound by lowering the limit frequency f _L while keeping the internal volume of a housing (hereinafter referred to as a speaker box) containing a speaker constant. It is widely practiced to make a speaker box a bass reflex type.

In such a bass reflex type speaker box, a duct is provided on the speaker mounting surface, and its equivalent mass m
_0, by the stiffness S _C exhibited by the air in the speaker box, by inverting the sound wave phase radiated to the back of the diaphragm of the speaker, sound waves radiated from the sound wave and duct opening emitted from the front surface of the speaker And radiated in the same phase.

The present applicant has previously proposed a speaker device 1 as shown in FIG. 6 in which a speaker box is made smaller in size than a bass reflex type speaker box containing a speaker as described above. In FIG. 6, reference numeral 2 denotes a small and lightweight speaker box made of a synthetic resin such as ABS, and a front plate (baffle plate) fixed to the front of the speaker box 2.
The speaker 3 is fixed to face the speaker mounting hole 2a formed on the upper side of 2F.

The speaker 3 is provided with, for example, a ring-shaped magnet 4, a plate 5 and a yoke 6 mounted so as to sandwich the ring-shaped magnet 4, and an inner peripheral side of the plate 5 and a center pole 6 a of the yoke 6. And a magnetic gap 7 is formed between them. The frame 5 of the speaker 3 is mounted on the plate 5.
An edge 9 is provided on the outer peripheral portion of the diaphragm, and the outer peripheral portion of the cone-shaped diaphragm 10 is held by the edge 9.

On the other hand, a voice coil bobbin 11 is mounted on an inner peripheral portion of the diaphragm 10, and a voice coil 12 is wound around the voice coil bobbin 11. It is designed to be inserted into the magnetic gap 7 formed by the center pole 6a. Reference numeral 17 denotes a damper for holding the voice coil 12 in the magnetic gap 7.

The acoustic signal supplied to the input terminal 13 provided on the rear panel 2B of the speaker box 2 is connected to the connection line 1
4 to the terminal 15 of the loudspeaker 3 via this terminal 1
5, the voice signal is transmitted to the voice coil 1 via the tinsel wire 16.
2.

The speaker box 2 having such a built-in speaker 3 constitutes a thin-type speaker device 1 of a so-called flat type. When the speaker box 2 has a thin structure, the length L of the duct becomes short. However, even when the speaker box 2 has a thin structure, the sound path of the duct needs to be secured to a required length L. For this reason, in FIG. 6, the duct has a folded structure.

That is, a first duct 18 for bass emission having an opening 18a opening forward is provided in the front plate 2F of the speaker box 2 on which the speaker 3 is mounted, in a direction perpendicular to the inner surface of the front plate 2F. A rear end port 18 of the first duct 18 is provided on the rear plate 2B corresponding to the first duct 18.
at a required interval D ₁ from b to the inner wall of the rear plate 2B, the second duct 19 of the larger diameter than the first duct 18 so as to surround the first duct 18, the first duct 18
And the front end 19 of the second duct 19
a is opposed at a predetermined spacing D ₂ on the inner wall of the front plate 2F.

The above-mentioned first duct 18 is integrally provided so as to be orthogonal to the inner surface of the front plate 2F, while the second duct 1
9 is provided on the inner surface of the rear plate 2B so as to overlap with the first duct 18 in a concentric manner, so that the rear plate 2B is attached to the front plate 2F in assembling the speaker box 1. By mounting so as to be parallel, a gap a ₁ is formed between the outer peripheral side of the first duct 18 and the inner peripheral side of the second duct 19, and a bass reflex type speaker having a long bent duct A device is obtained.

[0011]

According to the configuration of the speaker box 2 described with reference to FIG. 6, the size of the speaker box 2 from the front plate 2F to the rear plate 2B can be reduced and the speaker box 2 can be made thinner. It is.

However, the first and second ducts 18 and 19
Must be integrally molded with the front panel 2F and the rear panel 2B in advance, so there is no flexibility when opening the duct to a side panel other than the front panel. And there is a problem that becomes extremely complicated.

The present invention seeks to obtain a speaker device which solves the above-mentioned problems. An object to be solved by the present invention is to increase the radiation area of the duct 18 of the speaker box 2 and to improve the speaker box. The purpose of the present invention is to obtain a bent duct in which a duct can be easily attached to any one of the six surfaces of 2, and the reaction force generated by the radiation force of the air in the duct in the speaker box can be canceled or attenuated. is there.

[0014]

A speaker device according to the present invention comprises a plurality of ducts in a duct opening formed in at least one side plate constituting at least six surfaces of a speaker box provided with at least one speaker. The bent duct is fitted and fixed.

According to the speaker device of the present invention, the duct length can be increased, and even in a small and lightweight speaker device, the reaction force of the duct radiation force is canceled out to suppress the swing, and the phase inversion duct can be easily replaced with the speaker. It can be attached to a predetermined side plate of the box.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A speaker device according to the present invention will be described below with reference to FIGS. FIG. 1 shows a first embodiment of the present invention, and is a cross-sectional view of a speaker device in which a duct shown in the perspective views of FIGS. 2A and 2B is fitted, and corresponding portions to FIG. The same reference numerals are given and duplicate explanations are omitted.

The speaker 3 provided in the speaker box 2 of FIG. 1 has the same configuration as that of FIG. 6, and the speaker box 2 has the same configuration as that of FIG. 6 except for the duct portion.
The duct shown in FIGS. 2A and 2B will be described.

In the perspective view of FIG. 2A, the first duct 1
8 consists of a pipe of length L ₁ which is composed of ABS or the like having both ends opening 18a and 18b. This first duct 1
In FIG. 2A, the second duct 19 is joined at a position inclined 45 ° counterclockwise with respect to the vertical Y axis perpendicular to the horizontal X axis in FIG. 2A.

The second duct 19 is formed in a semicircular shape on the outer periphery of the first duct 18, and has semicircular ducts 19a and 19b extending in the Z-axis direction and these semicircular ducts 19a and 19b.
b, a coupling portion 19c having an inner diameter larger than the outer diameter of the first duct 18 is connected. One ends of these semicircular ducts 19a and 19b are formed with openings 19d and 19e, and the other ends are closed. Similarly, one end of the coupling portion 19c has an opening 19f.
, And the other end is closed.

The length of the semi-circular ducts 19a and 19b of the second duct 19 is selected to L _1> L ₂ made and L _2, first
Through the opening 19f of the connecting portion 19c,
It is inserted to the near side from the sealing part 21 of the coupling part 19c,
The first and second ducts 18 and 19 are joined together,
A bent duct as shown in FIG. 2A is formed.

FIG. 2B shows the first and second ducts 18 and 1.
9 into a substantially square opening 18a and a substantially rectangular opening 19
2D except that the half-square ducts 19a 'and 19b' are joined on the Y-axis of the first duct 18, except that the ducts 19a 'and 19b' are joined together.

The bent duct pre-assembled as described above is fixed by fitting the outer periphery of the opening 18a of the first duct 18 into a through hole or square hole 22 formed in, for example, the front plate 2F of FIG. . As the fixing method, an appropriate method such as joining or screwing can be selected. Instead of the cantilever support, as shown by the broken line in FIG. 1, a bent duct may be fitted to the locking portion 23 or the like provided on the rear face plate 2B to support the both ends.

According to the above-described configuration, since the openings 19d and 19e of the second duct 19 are in the space of the speaker box 2, the semicircular duct 19 is caused by the sound pressure fluctuation in the space when the speaker 3 emits sound. (Semi-square duct 19a ') and 19
The air flowing from the openings 19d and 19e of b (19b ') as shown by the arrow A flows into the opening 18b of the first duct 18 and is discharged from the speaker box 2 from the opening 18a as shown by the arrow B.

Therefore, according to such a bent duct configuration, the reaction force -F of the duct radiation force F _D1 and F _D2 / 2 + F _D2 / 2 between the first duct 18 and the second duct 19 is obtained.
_D1 and _{-F D2 / 2 + (- F} D2 / 2) Since being respectively offset, considering as a speaker apparatus 1 to need a reaction force at the time of sound emission in the duct portion without being lightweight speaker box 2 In such a case, the reaction force to the operation force when the speaker 3 emits sound may be canceled or attenuated.

According to the above-described duct, the length of the duct is long as a whole and the thickness is large, so that the front plate 2F of the speaker device 1 is provided.
When viewed from the side, the second duct 19 can be freely selected in a left-right, up-down, or tilted direction, and can be easily attached to any of the six side plates of the speaker box 2.

FIGS. 3 and 4 show another embodiment of the speaker device of the present invention. FIG. 3 is a side sectional view of the speaker device provided with the bent duct shown in the perspective view of FIG. 4A. 3 except for the configuration of the duct in the configuration of FIG. 3, only the configuration of the duct will be described below with reference to FIGS. 3 and 4A.

The duct shown in the perspective view of FIG. 4A also comprises first and second ducts 18 and 19.

One end of the first duct 18 is formed as an opening 18 a, and the other end is closed by a sealing portion 24. One end of a semicircular duct 19a constituting the second duct 19 has an opening 1
9d, and the other end is closed by a sealing portion 25.

A second duct is provided above the first duct 18 on the Y axis.
A semicircular duct 19 a constituting the duct 19 is joined, and an opening 26 is formed near the sealing portion 24 of the first duct 18.

The length of the first duct 18 in the Z-axis direction is L ₁
In addition, the length of the second duct 19 is selected to be L ₂ and L ₁ > L
The relationship of ₂ is established and the sealing portions 24 and 25 are aligned and joined together.

Accordingly, the air in the speaker box 2 is supplied to the second duct by fitting such a bent duct into the through hole 22 formed in the front plate 2F as shown in FIG. 19, enters through the opening 19d as shown by the arrow A, reverses at the opening 26, and opens at the opening 1 of the second duct 18.
From 8a, it is emitted to the outside of the speaker box 2 as shown by the arrow B.

[0032] Depending, reaction force -F _D2 of the reaction force -F _D1 and second duct 19 in this case is also the first duct 18 is mutually canceled, freely in a direction that is perforated spaces speaker box It can be easily installed, and the duct length can be long and thick.

The configuration shown in FIG. 4B is similar to that of FIG.
The openings of the second ducts 18 and 19 are square and half-square rectangular, and the second duct 19 is formed on the upper and lower surfaces on the Y axis and the left and right surfaces on the X axis of the first duct 18 in total of four. In this case, four openings 26, 26 # are formed in four surfaces near the sealing portion 24 of the first duct 18, and the duct length can be equivalently made longer. In this case the second
The radiation force generated by the inflow and outflow of air from the opening 19d of the duct 19 is F _D2 / 4 + F _D2 / 4 + F _D2 / 4 + F.
Becomes a _D2 / 4 = F _D1.

In this case as well, the reaction force of the duct radiation force is canceled between the plurality of ducts, and the speaker box 2
Swinging can be prevented.

FIG. 5 is an explanatory view showing a state in which the bent duct including the first and second ducts is attached to the speaker box 2.

FIGS. 5A to 5D and 5G are schematic diagrams viewed from the front of the front plate 2F of the speaker box 2, and FIGS.
5E, 5F, and 5H are schematic diagrams viewed from the side of the speaker box 2. FIG.

FIG. 5A shows the first duct 1 described with reference to FIG. 4A.
In this case, the speaker box 2 is attached to the front panel 2F so that the opening 19d of the second duct 19 comes to the upper side of the upper part 8 of the speaker box 2.

FIG. 5B shows the first of the bent duct of FIG. 4A.
In this case, the speaker is mounted on the front plate 2F of the speaker box 2 such that the opening 19d of the second duct 19 comes to the right (or left) side of the duct 18 of FIG.

FIG. 5C shows an opening 19d of the second duct 19 obliquely to the right (left oblique direction) of the first duct 18 having the structure of FIG. 4A.
Is attached to the front plate 2F of the speaker box 2 in such a manner as to come.

FIG. 5D shows the first of the bent ducts of FIG. 2A.
The second duct 19 is mounted on the front plate 2F of the speaker box 2 such that the two openings 19d and 19e of the second duct 19 are located at a position inclined 45 ° left (or right) from the Y-axis (vertical axis) direction of the duct 18 of FIG. Is the case.

FIG. 5E shows the first and second ducts 1 of FIG. 4A.
8 and 19 are disposed below the through holes formed in the rear plate 2B. FIG. 5F is fitted into the through holes formed in the lower plate 2D, and FIG. 5G is the left and right side plates 2L and 2R of the speaker box.
In this case, two sets of first and second ducts 18 and 19 are attached to the first and second ducts.

FIG. 5H shows a case where the first and second ducts 18 and 19 described in detail in FIG. 2A are arranged on the upper surface plate 2U of the speaker box 2.

As in the above-described configurations, the first and second ducts 18 and 19 are placed at appropriate positions on the six surfaces of the speaker box 2 (upper, lower, left, right, front and rear) and at predetermined angular positions when viewed from the front side of each surface. The above-mentioned bent duct can be appropriately disposed in an empty space in the small speaker box 2 because it can be attached at an appropriate angle while being inclined.

Although FIGS. 5A to 5H illustrate eight mounting methods, the above-described bent ducts can be arranged in the speaker box by appropriately combining these mounting methods.

[0045]

According to the loudspeaker apparatus of the present invention, the first and second ducts that bend the reaction force at the time of sound radiation of the duct due to the reaction force of the sound radiation force of the speaker disposed in the speaker box to constitute the duct. This makes it possible to cancel or attenuate, suppress the swinging of the small and lightweight speaker device, increase the radiating power of the sound of the speaker powerfully and reduce the thick and long duct, and save space in different types of speaker boxes. It can be easily installed according to.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a speaker device of the present invention.

FIG. 2 is a perspective view of a duct used in the speaker device of the present invention.

FIG. 3 is another side sectional view of the speaker device of the present invention.

FIG. 4 is another perspective view of a duct used in the speaker device of the present invention.

FIG. 5 is an explanatory view of duct attachment of the speaker device of the present invention.

FIG. 6 is a side sectional view of a conventional speaker device.

[Explanation of symbols]

1 ‥‥ Speaker device, 2 ‥‥ Speaker box, 3 ‥‥
Speaker, 18 ス ピ ー カ first duct, 19 ‥‥ second duct

Claims (3)

[Claims] 1. A bent box comprising a plurality of ducts is fitted and fixed to a duct opening formed in at least one side plate constituting at least six sides of a speaker box in which at least one speaker is disposed. A speaker device characterized by the above-mentioned. 2. The bent duct is a first duct having both ends opened, and a second duct having a substantially U-shape bent up and down or left and right of the first duct and one end face of which is closed. The speaker device according to claim 1, further comprising: 3. The bent duct is constituted by a second duct having one end closed at least on one of upper and lower sides and / or left and right sides of the first duct whose one end is closed,
2. The speaker device according to claim 1, wherein an opening is formed in the vicinity of the closing of the first duct and the second duct.