JPH0335689A - Loudspeaker equipment - Google Patents

Abstract

PURPOSE:To widely simplify the forming equipment of a duct and to reduce man-hour for fitting a loudspeaker by providing an opening in one part of constituting walls in a box incorporating the loudspeaker, and connecting the duct made of a high-hardness rubber having prescribed length, diameter and shape to the opening. CONSTITUTION:For this loudspeaker equipment, a loudspeaker 12 is fitted to parts 13 on the front face of the box and a duct 15 composed of hard ethylene and propylene rubber is forcedly inserted to an opening part 17 of the box. Afterwards, the parts 13 on the front face of the box are fastened by screws with parts 14 on the back of the box. For the duct 15, a tube body 20 composed of the hard ethylene and prolylene rubber is pushed out from a nozzle 19 as shown in a figure (a), inserted to a crunck-shaped jig 21 as shown a figure (b), cured as shown like a (c) and formed in the shape of a crunck by pulling the jig 21 out as shown a (d).

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a bass reflex type speaker device used in various types of audio equipment.

Conventional technology As a method of increasing the reproduction limit frequency on the bass side of a speaker built into a small-volume box, by setting a duct with an adjusted length and diameter in the box, the low frequency determined by the length and diameter can be increased. A bass reflex system that resonates sounds in the range is often used.

Conventionally, known configurations for providing this duct in a box include a configuration in which it is formed integrally with the box component parts as shown in FIG. 8, and a configuration in which a duct formed as a separate component is attached as shown in FIG. ing.

That is, in the case shown in FIG. 8, a box front part 3 having a duct 2 integrally provided in a part is combined with a box rear part 1, and the box front part 3 is connected with screws 4.
In the case shown in FIG. 9, a box front part 3 having an opening 6 formed in the box rear part 1 is connected with screws 4, and the opening of the box front part 3 is connected to the box front part 3. L-shaped duct 7 formed separately in 6
are connected by screws 8 through a sealing cushion material 9, and a speaker 5 is assembled into this box front part 3.

Problems to be Solved by the Invention However, these configurations have the following drawbacks when the external shape of the speaker device is limited and the components of the duct and box are mass-produced using molds.

In the example of Figure 8, the duct 2 is the box front part 3.
Since it is molded integrally with the box front part 3, it can only be installed in the mold opening/closing direction of the box front part 3, so the duct length is limited to the depth that allows the button to be pressed in the box mold opening/closing direction.This is necessary for the design of the bass reflex system. There were cases where the length was not provided.

In the example of FIG. 9, the duct 7 has a bent part, so the opening and closing directions of the two axes of the vertical opening/closing mold 10 and the horizontal opening/closing mold 11 are changed as shown in FIG. 10. In addition to requiring a complicated mold for molding, in order to ensure acoustic airtightness and installation strength when attaching to the box front part 3, a sealing cushion material 9 is inserted into the fitting tube and screws 8 Tightening requires other work and structure. Also, in terms of acoustics, since the inside of the bent part is straightened for the purpose of opening and closing the mold, a cross-sectional discontinuity occurs at the part shown in Figure 10, which obstructs smooth air flow and deteriorates the sound quality of low frequencies. It was something that made me want to do something.

In view of the above drawbacks, the present invention does not require large-scale equipment,
By using a duct that can be formed into any shape, a speaker device is provided that can implement a bass reflex system regardless of the shape of the box and without deteriorating the bass sound.

Means for Solving the Problem In order to solve this problem, the speaker device of the present invention has the following features:
Consists of a box that incorporates a speaker and has an opening formed in a part of its constituent wall, and a high-hardness rubber having a predetermined length, diameter, and shape that is connected to this opening and supported and fixed to the box constituent wall. It is grooved from the duct.

Function: Due to this groove engagement, when molding ducts, there is no need for large-scale equipment such as molding molds other than extrusion molding nozzles and holding jigs during vulcanization. A duct with two or more bending points, which was considered difficult to form during the opening and closing process, can now be formed by releasing it from a jig using the elasticity of rubber.

For some speaker devices, by molding this duct according to the shape of the box, it is possible to always ensure the duct length necessary for bass reflex design. In the past, when installing the box and duct, by making the opening diameter of the duct attachment part on the box side slightly smaller than the outside diameter of the duct, the elasticity of the rubber prevented abnormal noise caused by vibration from occurring between the box and the duct. , it is possible to maintain a highly airtight installation.

Furthermore, this installation does not require any work such as screw tightening or welding other than the support by the constituent wall of the box.

Acoustically, since the inside of the bent part can be kept at a uniform cross-sectional area,
Smooth air flow is achieved, improving bass sound quality.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of an automobile floor-mounted bass reflex type speaker device according to a first embodiment of the present invention. Also, the second
The figure is a sectional view taken along line A-A in FIG. 1.

12] Speaker, 13 is a front part of the box made of synthetic resin, 14 is a rear part of the box, 16 is a duct made of hard ethylene propylene rubber with one bent part, 16 is the rear part of the box Duct holding part provided on the inner surface of part 14, 17 is box front part 1
3 is the box opening provided, 18 is the box front part 1
This is the mounting part provided on the bottom surface of 3. The speaker device of this embodiment has a speaker 12 attached to a box front part 13,
After press-fitting the duct 16 made of hard ethylene or propylene rubber into the box opening 17, the box front part 13
and box rear part 14 are screwed together. By the way, the duct diameter required for this speaker system to be a bass reflex system is 251T+m.

The length was 95ff1m.

The duct 15 has a nozzle 19 as shown in FIG. 3(a).
Tube body 2o made from hard ethylene/propylene rubber
is extruded, and this tube body 20 is inserted into a crank-shaped jig 21 as shown in FIG. 3 (1).
0), and the jig 2ff'fe is pulled out as shown in FIG. 3(d) to obtain a crank-shaped product.

With this configuration, it is possible to achieve a duct length that was impossible in the conventional example shown in Fig. 8 due to the insufficient depth of the box, and the duct forming equipment is greatly simplified compared to the conventional example shown in Fig. 9. , the installation man-hours were also reduced.

Furthermore, Fig. 7 shows the case where the conventional duct 7 shown in Fig. 9 is attached to the speaker device shown in Fig. 1, and the case where the duct 16 shown in Fig. 1 is used. FIG. 3 is a distortion-frequency characteristic diagram comparing harmonic distortion. Harder ethylene than conventional examples.

The duct 15 made of propylene rubber was able to significantly reduce third harmonic distortion.

FIG. 4 is a perspective view of a speaker device embedded in a vehicle luggage compartment, which is a second embodiment of the present invention. FIG. 5 is a cross-sectional view of this speaker device taken along line B-B.

Referring to FIG. 4, 12 is a speaker, 13 is a box front layer part, 14 is a box rear part, 1e is a duct holding part,
1γ is a box opening, and the above structure is similar to that shown in FIG. The difference from the configuration shown in Figure 1 is that of hard ethylene.
This is because the duct 15 made of propylene rubber has two bent portions.

Through this thinning, it is possible to realize the duct H with a simple jig that requires two bends, which could not be realized in the conventional example shown in Fig. 9, and also reduce the third harmonic distortion caused by the air flow resistance at the bends. This is a significant reduction.

Furthermore, as shown in FIGS. 6(IL) and (b), the outer peripheral surface of the box opening 17 of the box rear part 13 is shaped like an inverted truncated cone, and the duct 15 is press-fitted there.
This makes it easier to insert and improve airtightness.

In addition, 1. In the second embodiment, the ducts 15 made of hard ethylene and propylene rubber were provided inside the box, but they may also be provided outside the box.

Also, if the material of the grooved parts 13 and 14 is polygreylene or polyethylene, the material of the duct 15 is neoprene rubber.

Effects of the Invention As described above, the present invention provides an opening in a part of the constituent wall of a box in which a speaker is incorporated, and a duct made of high hardness rubber and having a predetermined length, diameter, and shape. By combining them, it is possible to create a bass reflex system regardless of the shape of the box, and it also makes it possible to reduce man-hours when installing ducts and simplify equipment when creating ducts. It is possible to realize an excellent speaker device that can reduce distortion, and its practical effects are great.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a speaker device according to a first embodiment of the present invention, Fig. 2 is a sectional view taken along the Mu staff of Fig. 1, and Fig. 3 (+a). FIG. 4 is a perspective view of a speaker device according to the second embodiment, FIG. 6 is a sectional view taken along line B-B in FIG. 4, and FIG.
a) and (b) are a cross-sectional front view and a cross-sectional side view of main parts of the third embodiment, FIG. 7 is a third harmonic distortion characteristic diagram of a speaker device using the present invention and a conventional duct, and FIG. Figure 8 is a sectional view of a conventional speaker device having a duct molded into one box.
FIG. 9 is a sectional view of a conventional speaker device having a separate component duct made by injection molding, and FIG. 10 is an explanatory view of the mold opening/closing structure of the injection molded duct of FIG. 12...Speaker, 13...Box front part, 14...Box rear part, 16...
...Duct, 16...Duct holding part, 1
7...Box opening.

Claims (1)

[Claims] A speaker device in which an opening is provided in a part of the constituent wall of a box incorporating a speaker, and a duct made of high hardness rubber and having a predetermined length, diameter, and shape is connected to the opening.