JPH0247998A - Horn type speaker unit - Google Patents

Abstract

PURPOSE:To facilitate and ensure the phase correction of each part of a diaphragm by selecting the number and opening position of sound holes opened to an equalizer based on the result of vibration analysis simulation. CONSTITUTION:The equalizer 8 is made of a conical trapezoidal metallic member of aluminum or the like and lots of sounding holes 8c from the bottom face opposite to the rear face of the diaphragm 5 reaching the top face of a center opening 2 of a center pole 1 are arranged as a bundle. The prescribed number of the sounding holes 8c are opened at a prescribed location by a carbon dioxide gas laser or the like so that the phase of the vibration of each part of the diaphragm 5 is corrected based on the result of vibration analysis simulation. Thus, the phase correction of the vibration of each part is easily and surely attained.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a horn-shaped speaker unit.

% regarding its equalizer improvements.

[Conventional technology]

Figure 2 is a vertical cross-sectional view of a conventional horn-shaped speaker unit. In Figure 2, (1) is the center ball, (2)
is its central opening, (3) is a magnet, (41 is a top plate superimposed on it, (5) is a diaphragm supported by this top plate, and (6) is a cover that covers the front of it and is made of sound absorbing material. (7) is backed. (8) has its top surface located at the central opening (3) of the center ball (4), and its bottom surface facing the back surface of the diaphragm (5). The aluminum equalizer (8a) is an annular sound hole drilled in the equalizer.

FIG. 3 shows another conventional example of an equalizer.

In this case a plurality of rings (8b) having a frustoconical cross section.

They are concentrically combined to form a sound hole (8a) therebetween.

[Problem to be solved by the invention]

Although the sound holes (8a) in conventional equalizers are different in number, they are all just annular traps, so
There was a problem in that detailed characteristics could not be corrected.

Characteristics can be corrected based on the results of vibration analysis simulation of the Mononoke diaphragm of the present invention.

The purpose is to provide flexibility in the position and number of sound holes.

[Means to solve the problem]

The equalizer of this invention has a large number of sound holes extending from the bottom to the top of a truncated conical metal member, and is diffused into a bundle from the center axis of the truncated conical metal member to the outside by drilling holes using, for example, a carbon dioxide laser. It is set up.

[Effect]

In the case of this invention, the phase of the imaging of each part of the diaphragm is corrected by selecting the opening position and number of the sound holes provided in the equalizer.

〔Example〕

An embodiment of this invention will be described below. That is, in FIG. 1, the same or corresponding parts as those in FIG. It is made of a truncated cone-shaped metal member made of aluminum or the like, and in its assembled state, it has a large number of parts that reach from the bottom surface facing the back of the diaphragm (5) to the top surface located at the central opening (3) of the center ball (1). The sound holes (8C) are distributed in a bundle from the axial center of the truncated conical metal member to the outside, and each of these sound holes is connected to the diaphragm (5). A predetermined number of laser beams are opened at predetermined locations using, for example, a carbon dioxide laser, so that the phase of vibration of each part of the oscillator can be corrected.

Note that the top surface of the equalizer (8) is originally a flat surface, but
Depending on the number of sound holes to be opened, each sound hole (8c) is focused on the opening (3) side, so the top surface disappears and it may not necessarily become a flat surface.

In addition, although the cross-sectional shape of each of the above-mentioned sound holes is usually circular, it may be any shape such as an ellipse. Further, the inner diameter of each sound hole may be the same as that on the diaphragm side and the center opening side of the center ball, or may be tapered to change the inner diameter.

〔Effect of the invention〕

The horn-shaped speaker unit of the present invention has the effect that this can be achieved more easily and reliably.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing an embodiment of a horn-shaped speaker unit of the present invention, FIG. 2 is a vertical sectional view of a conventional horn-shaped speaker unit, and FIG. 3 is a partial perspective view showing the main parts of a conventional equalizer. It is a diagram. In the figure, (1) is the center ball, (2) is the opening, (
5) is a diaphragm, (8) is an equalizer, and (8c) is a sound hole. In other figures, the same reference numerals indicate the same or corresponding parts. Figure 1

Claims (1)

[Claims] A truncated cone-shaped metal member in which a large number of sound holes are distributed in a bundle from the bottom surface facing the back of the diaphragm to the top surface located at the central opening of the center pole, extending outward from its axis. A horn-shaped speaker unit characterized by forming an equalizer.