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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
horn type speaker unit. Percent of that equalizer improvement. [Prior Art] FIG. 2 is a vertical
sectional view of a conventional horn-type speaker unit, in FIG. 2 (1) is a center ball, (2) is its
central opening, (3) is a magnet, and (41 is its) The top plate polymerized on the top, (5) is a
diaphragm supported by the top plate, and (6) is a cover covering the front face of which a sound
absorbing material (7) is backed. (8) is an aluminum equalizer in which the top surface is
positioned at the central opening (3) of the center ball (4) and the bottom surface is opposed to
the rear surface of the diaphragm (5); It is an annular sound passage hole drilled in the FIG. 3 is
another conventional example of the equalizer. In this case there are multiple frustum-shaped
rings (8b) in cross section. Each of them is combined concentrically so as to form a sound
passage (8a) therebetween. [Problems to be Solved by the Invention] Even if there are differences
in the number of sound passing holes (8a) in the conventional equalizer, all of them are only
ring-shaped, so that the characteristic can not be corrected in detail. was there. The characteristic
correction can be performed based on the result of the vibration analysis simulation of the
present invention diaphragm. The purpose is to give 7 lexibility to the opening position and
number of sound passage holes. [Means for Solving the Problems] In the equalizer according to
the present invention, a large number of sound passing holes that reach from the bottom to the
top of a two-conical metal member are formed by using, for example, a carbon dioxide gas laser.
It is diffused and arranged in a bundle from the central axis to the outside. [Operation] In the
case of the present invention, the phase correction of the imaging movement of each part of the
diaphragm is made by the selection of the opening position and the number of the sound passing
holes opened in the equalizer. An embodiment of the present invention will be described below.
That is, in FIG. 1, the same or corresponding parts as those in FIG. 2 will be assigned the same
reference numerals, and duplicate explanations thereof will be omitted, but (2) in FIG. 2 is the
equalizer in the present invention. Consists of a truncated metal member such as aluminum,
which in its installed state reach from the bottom opposite the back of the diaphragm (5) to the
top located at the central opening (3) of the center ball (1) Sound transmission holes (8C) are
diffusely arranged in a bundle from the axial center of the frusto-conical metal member to the
outside, and each of the sound transmission holes is a diaphragm (5) In order to correct the
phase of the vibration of each part, a predetermined number of holes are provided at
predetermined places by, for example, a carbon dioxide gas laser.
Although the top surface of the equalizer (8) is originally a flat surface, the sound passing holes
(8c) are converged at the above-mentioned opening (3) side depending on the number of sound
passing holes to be opened. The top surface disappears and may not always be flat. In addition,
although the cross-sectional shape of each of the above-mentioned sound passing holes is usually
circular, it may be any shape such as oval. Further, the inner diameter of each sound
transmission hole may be the same as that of the diaphragm side and the center opening side of
the center ball, or may be tapered to change the inner diameter. According to the present
invention, the horn-type speaker unit of the present invention can be easily and reliably realized.
Brief description of the drawings
FIG. 1 is a vertical sectional view showing one embodiment of a horn type speaker unit according
to the present invention, FIG. 2 is a vertical sectional view of a conventional horn type speaker
unit, and FIG. 3 is a partial perspective view showing the main part of a conventional equalizer.
In the figure, (1) is a center ball, (2) is an opening, (5) is a diaphragm, (8) is an equalizer, and (8c)
is a sound passage hole. In the other figures, the same-reference symbols denote the same or
corresponding parts. Figure 1