JPH021995Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a speaker cabinet.

[Conventional technology]

Conventionally, methods have been put into practical use to increase the mechanical strength of the box itself by attaching reinforcing crosspieces and reinforcing rods to the cabinet, as well as to disperse and damp the plate vibrations of the full plate, side plates, and back plate. For example, Japanese Utility Model Application Laid-open No. 147376/1983 is aimed at damping plate vibration of a full plate.

Referring to FIG. 6, the baffle plate 1 has a structure in which a narrow groove 3 in the plate thickness direction is provided around the speaker unit 2, and the groove 3 is filled with a viscoelastic material 4 such as rubber.

[Problem that the invention attempts to solve]

One of the causes of the plate vibration of the baffle plate 1 is due to the reaction of the speaker unit 2, but since the conventional structure is a structure in which the buffle plate 1 is provided with grooves 3,
The mechanical strength of the buffed plate 1 is reduced. Therefore, the buffer plate 1, which serves as a reference for the sound source (speaker unit), vibrates and radiates sound more easily, so the sound from the buffer plate 1 is superimposed on the sound from the speaker unit 2, and the system There were problems in that the response characteristics deteriorated, leading to deterioration in transient characteristics and distortion characteristics.

The present invention aims to solve these problems.

[Means for solving problems]

In the present invention, a box is constituted by side plates, a back plate, and a first buttful plate provided with a sound emitting hole, and a second buttfull plate is arranged opposite to the first buttfull plate. A peripheral end of the second buffle plate is joined to each of the side plates, and a speaker unit is attached facing the sound emitting hole of the first buffle plate, and the second buffle plate and the one or more side plates are connected to each other. A viscoelastic material having a slit-like through hole the same as or slightly shorter than the width of the second buttful plate at the joint with the second buttful plate, and having airtightness between the first buttfull plate and the second buffle plate. It is characterized by having the body intervene.

[Effect]

As a result, vibrations propagating from the speaker unit as a vibration source through the second baffle plate to the side plate and the first baffle plate are blocked by the slit-like through holes. Therefore, the plate vibrations of the second buttful plate, the side plates, and the back plate are reduced.

〔Example〕

A first embodiment will be explained with reference to FIGS. 1 and 2.

A box is constituted by side plates 5a, 5b, 5c, and 5d, a back plate 6, and a first butt-full plate 7 provided with a sound emitting hole 8.

Reference numeral 9 denotes a second buffle plate that is arranged parallel to and opposite to the first buffle plate 7, and its peripheral end portion is joined to the inner surface of each of the side plates 5a, 5b, 5c, and 5d by adhesive or other means. And the first battle board 7
A speaker unit 10 is mounted opposite the sound emitting hole 8 of.

By forming elongated notches 13 in the circumferential direction at the peripheral end of the second buttful plate 9 excluding the four corners, the second buttfull plate 9 and each side plate 5a, 5
A slit-like through hole 11 slightly shorter than the width of the second buff-full plate 9 is provided at the joint with the second buff-full plate 9.
are formed respectively.

A sheet-like viscoelastic material 12, such as rubber, which has a large vibration-damping effect and has airtightness is inserted between the first buffle plate 7 and the second buffle plate 9, thereby forming a slit-like transparent material. Hole 11 is sealed.

In addition, the second full plate 9 and each side plate 5a, 5
b, 5c, and 5d are desirably bonded at the four corners of the second buffle plate 9, where the characteristic impedance is the largest and where vibrations are difficult to propagate.

3 and 4 show a modification of the first embodiment.

In the modification shown in FIG. 3, the slit-like through-hole 11 is divided into two slit-like through-holes 11a and 11b, and the overall effect is the same as that of the slit-like through-hole 11 in the above embodiment. be.

In the modification shown in FIG. 4, a slit-like through hole 11 is formed only at the joint between the opposing ends of the second buff-full plate 9 and the corresponding side plates 5a, 5c, and the width thereof is not shown in the figure. As in, the second full board 9
may be the same as the width of In this case, if the slit-like through holes 11 are asymmetrically provided at the joints between the second buffle plate 9 and one or more side plates, the first buffle plate 7, each of the side plates 5a, 5b, 5c, 5d, and the back plate 6 plate vibration modes can be dispersed.

Next, a second embodiment will be explained with reference to FIG. In the figure, parts equivalent to those of the first embodiment shown in FIGS. 1 and 2 are designated by the same reference numerals, and their explanation will be omitted.

First full plate 7 and each side plate 5a, 5b, 5
A second slit-shaped through-hole 14 is provided at the joint with the first baffle plate 7, except for the joints at the four corners of the first baffle plate 7.
is formed.

According to this embodiment, the vibrations from the speaker unit 10 are transmitted to the second baffle plate 9, each side plate 5a,
Slit-shaped through hole 1 at the joint with 5b, 5c, and 5d
Further, vibrations propagating from each side plate to the first baffle plate 7 are blocked by the second slit-shaped through hole 14. Therefore, the vibration isolation effect from the speaker unit 10 is greater than that of the first embodiment, and the plate vibration of the first baffle plate 7 is significantly reduced.

[Effect of idea]

According to the above configuration, vibrations from the speaker unit are blocked by the slit-shaped through holes, so the plate vibrations of the first baffle plate, side plate, and back plate are significantly reduced, and the speaker cabinet can be used as a speaker cabinet against plate vibrations. The accompanying deterioration of various properties is improved.

[Brief explanation of the drawing]

1 and 2 are diagrams showing the structure of a first embodiment of the speaker cabinet of the present invention, and FIG.
4 is a diagram showing the structure of a modified example of the same, FIG. 5 is a diagram showing the structure of a second embodiment of the same, and FIG. 6 is a diagram showing the structure of a conventional speaker cabinet. . 5a, 5b, 5c, 5d...Side plate, 6...Back plate, 7...First double plate, 8...Sound emission hole, 9
. . . second buff-full plate, 10 . . . speaker unit, 11 . . . slit-shaped through hole, 12 .

Claims (1)

[Scope of utility model registration request] Each side plate 5a, 5b, 5c, 5d, a back plate 6, and a first butt-full board 7 provided with a sound emitting hole 8 constitute a box body, and a second butt-full board 7 is arranged opposite to the first butt-full board 7. A buttful plate 9 is arranged, and the peripheral edge of the second buttfull plate 9 is connected to each of the side plates 5a, 5b, 5c,
5d, and the speaker unit 10 is connected to the sound emitting hole 8 of the first buffle plate 7.
, and a slit-shaped through hole 11 is provided at the joint between the second buffle plate 9 and the one or more side plates, and a slit-shaped through hole 11 is provided in the joint between the second buffle plate 9 and the one or more side plates. A speaker cabinet characterized in that a viscoelastic body 12 having airtightness is interposed between a buffle plate 7 and a second buffle plate 9.