JP4132349B2 - Speaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a speaker using a metal cabinet, and more particularly to a speaker in which a tension is applied to the cabinet.
[0002]
[Prior art]
Conventionally, it has been known that applying tension to a panel, regardless of metal or wood, changes the mode of vibration, resulting in a considerable vibration control effect. As a metal speaker cabinet, the internal propagation speed is fast and the rise is good. Attempts have been made to use duralumin, the strongest of those that can be mass-produced to obtain sound.
[0003]
Unlike aluminum, such duralumin cannot be welded and has no viscosity, so it will crack when bent, so it has been produced by combining relatively thick plates and screwing the edges or by casting.
However, screwing and casting of a duralumin thick plate not only has a high material cost, but also does not provide sufficient tension, and the characteristics of the material cannot be fully utilized.
[0004]
[Problems to be solved by the invention]
Therefore, there is a technical problem in providing a speaker provided with a speaker cabinet that uses such duralumin and gives tension to the duralumin so as to obtain a fast rising sound. However, the present inventor has arrived at the present invention by paying attention to the fact that duralumin can be made to be gently bent if the thickness is relatively thin.
[0005]
[Means for Solving the Problems]
The above problem consists of a cabinet composed of six duralumin panels and a speaker unit, and the upper and lower and left and right panels are each formed with a gentle curved surface, and the opposing upper, lower, left and right panels are respectively The problem is solved by a speaker including a speaker cabinet assembled in a state in which tension is applied by pulling each other with a through screw rod. In addition, it is preferable to use a relatively thin panel having a maximum thickness of about 4 mm for forming a bent surface without causing cracks. According to such a speaker, since the cabinet has a structure in which tension is applied to a high-strength material, not only the strength of the box is increased, but also a sound with a high internal propagation speed and a good rise can be obtained. Furthermore, since a parallel plane is not formed in each of the pair of upper and lower and left and right panels, a shape in which standing waves are difficult to occur is obtained.
[0006]
In addition, the speaker unit is incorporated in the front panel, and if the speaker unit rear surface is pressed with a screw rod screwed into the rear panel, the speaker unit itself made of metal contributes to vibration suppression.
[0007]
In order to assemble such a speaker cabinet, first of all, a gentle curved surface is formed by bending rollers or a press on the upper, lower, left and right panels, and the opposing upper, lower, left and right panels are respectively threaded through screw rods. Pull them together to assemble them into a cylindrical shape. Next, front and rear panels are formed in accordance with the shape of the opening at both ends of the cylindrical body, a speaker unit is attached to the front panel in advance, and the front and rear openings of the cylindrical body are threaded through the front panel and the rear panel. Pull them together to seal them. By such a method, it is possible to assemble a box body in a state where tension is applied to duralumin that cannot be welded and has low viscosity, and in which a parallel plane is not formed on each of the pair of upper and lower and left and right panels.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the speaker according to the present invention will be described in more detail with reference to the accompanying drawings.
FIG. 1 shows a speaker 1 according to a first embodiment of the present invention. Each of the upper and lower panels 2a and 2b and the left and right panels 3a and 3b is formed in a cylindrical shape having a gentle curved surface. The front and rear panels 4a and 4b and the speaker unit 5 attached to the front panel 4a are provided to seal the openings on both sides of the cylindrical body.
[0009]
The upper and lower panels 2a and 2b are formed in a wavy shape in which the central portion draws a gentle curved surface and bulges outward and both ends slightly warp, and through holes through which the through screw rods 6a and 6b are inserted are formed in two front and rear portions. Has been. The left and right panels 4a and 4b are formed in a curved shape with a gentle curved surface, and through holes through which the through screw rods 7a and 7b are inserted are formed at two front and rear portions.
[0010]
The front and rear panels 4a and 4b are cut and formed in a shape that matches both side openings of the cylindrical body formed by the upper, lower, left and right panels, and through holes are formed through which the through screw rods 8a and 8b are inserted. The front panel 4a is formed with a circular hole at the center, and the speaker unit 5 is fitted and screwed to the edge thereof.
[0011]
In addition, each through-hole formed in the lower panel 2b, the right panel 3b, and the rear panel 4b in FIG. 1 is a screw into which the tip screw portion of each through-screw rod 6a, 6b, 7a, 7b, 8a, 8b is screwed. It may be a hole. In the case of a through hole, the tip of each through screw rod is screwed with a nut (not shown).
[0012]
In order to assemble the above-mentioned panels into a box, first, through screw rods 7a and 7b are inserted into the left and right panels 3a and 3b, the screw rod ends are fastened with nuts, and the upper and lower panels 2a and 2b are covered from above and below. In this state, the through screw rods 6a and 6b are inserted into the through holes, the ends thereof are fastened with nuts, and the positions are adjusted between the left and right panels 3a and 3b, which are tightened and fixed to form a cylindrical body. Next, both ends of the cylindrical body are closed with the front and rear panels 4a and 4b, the through screw rods 8a and 8b are inserted into the through holes, and nuts are attached to the tips to tighten them. As each through screw rod is tightened, the top, bottom, left, and right panels are hermetically fixed in a box shape, which not only ensures strength but also forms a speaker cabinet with tension applied throughout. Become.
[0013]
FIGS. 2 and 3 show a speaker 1a according to the second embodiment, except that the curved shapes of the upper and lower panels 2c and 2d and the shapes of the front and rear panels 4c and 4d are different accordingly. Since it is the same as the first embodiment in that it is tightened to form a box shape, the description is omitted.
[0014]
The rear panel 4d has a screw hole at the center facing the speaker unit 5 attached to the front panel 4c, in addition to the through-holes for the through-screw rods 8a and 8b provided at both side edges that pull the panels together. At the same time, a screw rod 9 is screwed into the screw hole and presses the back surface of the opposing speaker unit. The threaded rod 9 is strong enough to withstand this pressing. Pressing from behind with the screw rod 9 contributes to damping of the metal unit itself.
[0015]
【The invention's effect】
According to the present invention, a loudspeaker capable of obtaining a sound with a high internal propagation speed and a good rise can be easily and inexpensively produced using a duralumin plate having high strength but not weldable and low viscosity. I was able to do it.
Furthermore, since a parallel plane is not formed in each of the pair of upper and lower and left and right panels, it is possible to provide a speaker in which standing waves hardly occur.
[0016]
Further, if the speaker unit back surface is pressed with a screw rod screwed into the rear panel, the speaker contributes to vibration suppression of the speaker unit itself.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a speaker according to a first embodiment of the present invention.
FIG. 2 is an exploded perspective view of a speaker according to a second embodiment of the present invention.
FIG. 3 is a longitudinal sectional view of the same.
[Explanation of symbols]
1, 1a Speakers 2a, 2c Upper panel 2b, 2d Lower panel 3a Left panel 3b Right panel 4a Front panel 4b Rear panel 5 Speaker units 6a, 6b, 7a, 7b, 8a, 8b Through screw rod 9 Screw rod

Claims (2)

It is composed of a cabinet composed of six duralumin panels and a speaker unit. The top, bottom, left and right panels are each formed with a gentle curved surface, and the top, bottom, left, right and front panels facing each other are threaded through screw rods. The speaker is characterized in that it is assembled in a state where it is pulled and tensioned together. The speaker according to claim 1, wherein the speaker unit is incorporated in a front panel, and a back surface of the speaker unit is pressed by a screw rod screwed into a rear panel.

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