JPS583440B2 - speaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker improved so that the reproducible frequency bandwidth can be extended both on the high-frequency side and on the low-frequency side.

In order to extend the frequency band of the speaker to the lower side, many methods for lowering the lowest resonance frequency fo include reducing the rigidity of the support system (mainly the damper) and increasing the mass of the vibration system. There is.

However, in the former case, the problem arises that it becomes difficult to maintain the center of the vibration system, and in the latter case, the high frequency limit is also lowered, efficiency decreases, and there are places where the vibration of the vibration system suddenly changes. This has the disadvantage that the reproduced sound changes unnaturally at that point.

The object of the present invention is to solve the problem of
It is an object of the present invention to provide an improved speaker that can lower o and at the same time raise the upper limit of the frequency band.

In the speaker of the present invention, a weight is attached to the damper that elastically supports the diaphragm at the center between the diaphragm side and the base body (eg, frame) side.

Therefore, when vibrating at a low frequency, the vibration system including the damper vibrates with the weight, so
A reduction in f0 is achieved by increasing the mass of the vibration system as a whole.

However, as the frequency increases beyond a certain frequency range, the weight virtually ceases to vibrate, and the mass of the part of the vibrating system that actually vibrates becomes smaller, providing favorable conditions for vibration at higher frequencies. .

As a result, the reproducible frequency band is extended to both the lower and higher frequencies.

An embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 1 indicates a frame, and this frame 1 includes a yoke 2, a magnet 3, and a ball piece 4.
A magnetic circuit 5 consisting of the following is attached.

Further, a cone-shaped diaphragm 6 is housed within the frame 1, and the diaphragm 6 is supported by the frame 1 at its peripheral edge.

Then, the winding frame 8, which is fixed to the center of the diaphragm 6 and has the voice coil 7 wound on the outer circumferential surface, plunges into the annular magnetic gap formed between the yoke 2 and the pole piece 4. ing.

Further, a winding frame 8 to which the center of the diaphragm 6 is fixed is elastically supported by the frame 1 by an annular damper 9.

As shown in FIG. 2, this damper 9 has a plurality of corrugations arranged in concentric circles, and has an annular recess located in the center between the inner edge and the outer edge. A ring-shaped weight 10 having a diameter equal to the diameter of this recess is housed in the recess.
0 is fixed to the damper 9 using adhesive.

A ring made of a metal with high specific gravity such as lead is suitable for the weight 10, but it can also be constructed by applying a thick layer of adhesive containing particles with high specific gravity.

A damping agent is applied to the surface of the damper 9 at a portion located between the diaphragm 6 and the weight 10.

In a speaker having such a damper 9, when the frequency of vibration acting on the diaphragm 6 is low, the damper 9 vibrates together with the weight 10.

Therefore, within this frequency band, the mass of the weight 10 is added to the mass of the vibration system, and the extension of the frequency band to the lower side due to the decrease in f0 is achieved.

Further, when the frequency of vibration is higher than a certain frequency determined by factors such as the mass of the entire vibration system, the stiffness of the damper 9, or the mass of the weight 10, the weight 10 becomes substantially non-vibrating, and the damper 9
The part that actually vibrates is the part located between the diaphragm 6 and the weight 10.

As a result, the frequency band width of this speaker is extended to both the low frequency side and the high frequency side.

Further, since a damping agent is applied to the surface of the damper 9 at the inner edge of the damper 9, which is the part that is fixed to the diaphragm 6 and the winding frame 8, and at the intermediate part where the weight 10 is supported,
Regarding the abnormal resonance near the transient frequency where the operation of the weight 10 changes, the damping agent suppresses the resonance between the weight 10 and the inside of the damper 9 that occurs especially in the high frequency side, but it has no damping effect in the low frequency side. It is possible to increase the compliance of the outer circumference of the damper 9 and take advantage of the effect of increasing the mass of the entire vibration system by adding the weight 10.

Therefore, the boundary between the region in which the weight 10 vibrates and the region in which it does not vibrate becomes less noticeable, which is advantageous in obtaining natural reproduced sound with sufficiently expanded low-range reproduction frequencies.

Furthermore, as another advantage of the present invention, since the weight 10 can provide a reinforcing effect in the circumferential direction of the damper 9, the linearity of the driving force-displacement characteristic in the vibration direction of the damper 9 is improved.

This not only improves the distortion characteristics as a whole, but also allows the use of a larger diameter damper, achieving high compliance.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a speaker according to an embodiment of the present invention;
FIG. 2 is a plan view of a damper applied to the speaker. 1...Frame, 2...Yoke, 3.
...Magnet, 4...Pole piece,
5... Magnetic circuit, 6... Vibration plate, I.
...Voice coil, 8... Winding frame, 9...
...Damper, 10...Weight.

Claims (1)

[Claims] 1 A winding frame that supports a voice coil located within a magnetic gap of a magnetic circuit, a diaphragm fixed to one end of this winding, and a damper that elastically supports the winding frame with respect to the magnetic circuit. The damper supports a weight of a predetermined mass at an intermediate portion separated by a predetermined distance from the part fixed to the winding frame, and a damper surface from the part fixed to the winding frame to the weight is provided with a damper. A speaker characterized by being coated with an agent.