JPH0638288A - Speaker system - Google Patents

Abstract

PURPOSE:To improve a low frequency sound reproduction capability by using a speaker unit having a resonance port. CONSTITUTION:A resonance port 22 made of a nonmagnetic material having a same diameter as that of a throughhole 23 provided to a center pole 21 is fixed to a cone 16. Moreover, a damper adhering margin 24 provided to part of the resonance port 22 and the cone 16 are adhered via a damper 20. A bass reflex type speaker system is formed by mounting the speaker unit onto a cabinet 25. Thus, it is not required to provide the resonance port 3 such as a buffle or a rear plate onto the cabinet, the space is saved and the low frequency sound reproduction capability is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker device, and more particularly to improving the structure of a speaker unit to improve bass reproduction capability.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for miniaturization of cabinets for speaker systems. However, if the cabinet is downsized, it becomes difficult to reproduce the bass and the sound quality becomes narrow.

Therefore, there is a so-called bass reflex type speaker system which resonates the air in the cabinet with a resonance port to enhance the low frequency range.

As shown in FIG. 3, this is a speaker unit 1, a cabinet 2 for shielding acoustic energy radiated from the rear surface of the speaker unit 1, and a resonance port 3.
It consists of and. Further, as shown in FIG. 4, the acoustically equivalent drone cone 4 may be provided in place of the resonance port.

In such a configuration, as shown in FIGS. 3 to 6, the resonance port 3 or the drone cone 4 is arranged on the baffle plate 5 or the back plate 6. However, when the resonance port 3 or the drone cone 4 is arranged on the baffle plate 5, if the port diameter area of the resonance port 3 or the area of the drone cone 4 is large, the baffle plate 5 is inevitably large, and the cabinet. 2. It is difficult to reduce the size. Moreover, the resonance port 3 or the drone cone 4 is attached to the back plate 6.
However, even if the cabinet is arranged, the sound quality changes when the cabinet 2 is brought close to the wall surface of the room.

[0006]

In order to solve such a problem, for example, Japanese Patent Publication No. 3-78839 (H04R9 /
The speaker disclosed in 06) is known. FIG. 7 shows the outline of the structure. This divides the circular diaphragm 7 into two concentric circles and supports it by the edges 8 and 9, with the inner diaphragm 7a of the circular diaphragm 7 as the main diaphragm and the outer diaphragm of the circular diaphragm 7. 7b is used as a drone cone.

This speaker has the following drawbacks. First, the structure is complicated and difficult to assemble. When a large input is applied, the inner diaphragm 7a fluctuates, causing a so-called rolling phenomenon. further,
Unless the resonance frequency between the inner diaphragm 7a and the outer diaphragm 7b is strictly controlled, large peaks and dips occur in the characteristics.

On the other hand, as shown in FIG. 8, there is also a structure in which a through hole 11 is provided in the center pole portion 10 of the magnetic circuit of the speaker and a resonance port 12 is provided on the side opposite to the diaphragm side. This case has the following drawbacks. That is, unless the air permeability of the dust cap 14 adhered to the central portion of the cone 13 is raised considerably, the passage of air is blocked and the characteristics change. Since the voice coil bobbin 15 also acts as a part of the resonance port, the amplitude of the voice coil bobbin 15 changes depending on the size of the input signal and the frequency of the input signal. Therefore, the total length of the port will change,
The resonance frequency also changes and the characteristics are not stable.

[0009]

In order to solve the above problems, the present invention provides a speaker system including a speaker unit having a resonance port formed through a center pole. Is.

[0010]

With the above structure, the resonance port formed by penetrating the center pole improves the bass reproduction capability.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the structure of a speaker unit used in the speaker system of the present invention. In the figure, 16 is a cone, 17 is an edge for supporting the cone 16, 18 is a voice coil bobbin, 19 is a first damper, 2
0 is the second damper, 21 is the center pole, 22 is the resonance port connected to the center pole 21, and 2
Reference numeral 3 is a through hole provided in the center pole 21.

The present invention is characterized in that a resonance port 22 of a non-magnetic material having the same diameter as the through hole 23 provided in the center pole 21 is fixed to the cone 16 side. The reason why the non-magnetic material is used is to reduce the leakage of the magnetic flux in the magnetic gap, and various methods of fixing the resonance port can be applied, such as by forming an adhesive agent or forming a screw thread and screwing.

Reference numeral 24 denotes a second damper bonding glue margin provided on a part of the resonance port 22, and the second damper bonding glue margin 24 and the cone 16 are bonded via the second damper 20. There is. The second damper 20 and the first damper 1
Although 9 has a concentric corrugation, it is desirable that the material thereof is not breathable.

FIG. 2 shows a speaker system to which the speaker unit shown in FIG. 1 is attached. In the figure, reference numeral 25 is a cabinet. By mounting the speaker unit as described above to the cabinet 25, a bass reflex type speaker system is configured.

Generally, in the case of a bass reflex type speaker system, it is possible to change the resonance frequency by adjusting the cross-sectional area or length of the resonance port provided that the minimum resonance frequency f0 of the speaker and the cabinet volume are constant. In the case of the present invention, the length is adjusted.

[0017]

As described above in detail, according to the present invention, since the speaker system is provided with the speaker unit having the resonance port formed through the center pole, the resonance occurs on the cabinet such as the baffle and the back plate. There is no need to provide a port, which saves space and improves bass reproduction capability.

[Brief description of drawings]

FIG. 1 is a side sectional view of a main part of a speaker unit used in the present invention.

FIG. 2 is a side sectional view of a main part of the speaker system of the present invention.

FIG. 3 is a side sectional view of a main part of a conventional speaker system.

FIG. 4 is a side sectional view of a main part of a conventional speaker system.

FIG. 5 is a side sectional view of a main part of a conventional speaker system.

FIG. 6 is a side sectional view of a main part of a conventional speaker system.

FIG. 7 is a side sectional view of a main part of a conventional speaker unit.

FIG. 8 is a side sectional view of a main part of a conventional speaker unit.

[Explanation of symbols]

 1 speaker unit 2 cabinet 3 resonance port 4 drone cone 5 baffle plate 6 back plate 7 circular diaphragm 7a inner diaphragm 7b outer diaphragm 8 edge 9 edge 10 center pole part 11 through hole 12 resonance port 13 cone 14 dust cap 15 voice Coil bobbin 16 Cone 17 Edge 18 Voice coil bobbin 19 First damper 20 Second damper 21 Center pole 22 Resonance port 23 Through hole 24 Second damper adhesive glue margin 25 Cabinet

Claims (1)

[Claims] 1. A speaker system comprising a speaker unit having a resonance port formed through a center pole.