JPH0378839B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker, and particularly to a speaker with excellent bass reproduction ability.

Conventionally, a separate drone cone is often attached to increase the bass reproduction ability of a speaker. However, when there is only a limited speaker mounting area, there is no space for mounting the drone cone, as shown in FIG. That is, in Figure 1, 1
1 is a cabinet front plate, 12 is a speaker attached thereto, and 13 is a drone cone having the same area as the speaker 12; the cabinet front plate 11 does not have a mounting space for the drone cone 13. It is also possible to adopt a bass reflex system, but in such a small cabinet, making the duct opening larger increases the length of the duct, making it difficult to fit it into the cabinet. However, the degree of improvement in bass reproduction ability was small.

SUMMARY OF THE INVENTION In view of these problems, it is an object of the present invention to provide a speaker that can provide excellent bass reproduction ability when there is only a limited area for mounting the speaker.

The present invention achieves this object by dividing a diaphragm into two parts, a disc-shaped diaphragm and an annular diaphragm, at an annular edge, and one of the diaphragms can be used as a drone cone. A speaker is provided, and the diaphragm divided into two parts has approximately the same area.

Embodiments of the present invention will be described below based on the drawings. In Fig. 2, 1 is the cabinet front plate;
2 and 3 are diaphragms that are divided into two parts at edge 4, and one can be used as a speaker and the other as a drone cone, and even if both are configured to have the same area, the conventional cabinet in Fig. It is attached to the cabinet front plate 1 having the same size as the front plate 11. Next, a specific example of the configuration will be explained with reference to FIGS. 3 to 6. In FIG. 3, the outer diaphragm 3 is supported by the frame 8 by the edges 5, and the inner diaphragm 2 is wound with a voice coil 7. The spun bobbin is connected. 6 is a damper interposed between the bobbin and the frame, and 9 is a magnet placed inside the voice coil 7. In this embodiment, the inner diaphragm 2 is used as a speaker, and the outer diaphragm 3 is used as a drone cone. The one shown in FIG. 4 has the same basic configuration as that shown in FIG. It is designed to support.

Next, a concrete experimental example is shown in which a speaker with a diameter of 18 cm is attached to a bass reflex type cabinet with external dimensions of 315 x 315 x 157 mm, and the diaphragm of a speaker with a diameter of 25 cm is divided into two edges and the inside of the diaphragm is attached to a bass reflex type cabinet with external dimensions of 315 x 315 x 157 mm. A speaker according to the present invention, which has the same area as the speaker and whose outer side is used as a drone cone, was compared with a speaker installed in a cabinet with an outer diameter of 315 x 315 x 157 mm. The resulting sound pressure frequency characteristics are shown in Figure 5, where the dotted line indicates the sound pressure frequency characteristics for a bass reflex type cabinet.
The solid line is the sound pressure frequency characteristic in the case of the present invention. As can be seen from Fig. 5, a cabinet of the same size has a bass reproduction ability that surpasses that of a bass reflex type.

According to the speaker of the present invention, as is clear from the above explanation, since the diaphragm is divided into two parts by an edge, one of the parts is made into a drone cone, so that excellent bass sound can be achieved even when there is only a limited speaker mounting area. In addition, the drone cone part can be made as part of a single speaker at the same time, and there is no need to make a separate frame, which significantly reduces manufacturing man-hours and is extremely advantageous in terms of cost. be.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram comparing the sizes of the cabinet, speaker, and drone cone, Fig. 2 is an explanatory diagram showing a state in which the speaker according to the present invention is attached to a cabinet of the same size as Fig. 1, and Fig. 3 and FIG. 4 are longitudinal sectional views of embodiments of the speaker according to the present invention, and FIG. 5 is a graph showing sound pressure frequency characteristics. 1 is the cabinet front plate, 2 is the inner diaphragm,
3 is the outer diaphragm, 4 is the edge that divides the diaphragm into two, 5 is the edge, 6 is the damper, 7 is the voice coil, and 8 is the frame.

Claims (1)

[Claims] 1 The diaphragm is concentrically divided into two parts by a single edge, and a voice coil supported by a damper attached to the frame drives the diaphragm on the inner circumference side of the two halves, and also drives the two halves of the diaphragm on the outer circumference side. A speaker characterized in that the outer periphery of the diaphragm on the side divided into two is made into a drone cone by supporting the outer periphery of the diaphragm on the frame with another edge.