JPH0336158Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention relates to attaching a cover to the front panel of a speaker box in a speaker system.

(B) Prior Art Conventionally, this type of cover is made of woven fabric or a metal plate or resin plate with many pores, and is attached to the speaker for the purpose of dustproofing and aesthetics. However, in order to improve the sound through the speaker, the ventilation holes in the cover must be made larger, and there is a problem in that if they are made larger, the dust-proofing effect will be weakened.

In addition, as shown in Japanese Patent Publication No. 53-40889, a cover made of laminated semi-rigid styrene plates is attached to the base so as to cover the speaker mounting brackets, etc.
Additionally, there are some that attach the base to the panel. However, in this case as well, it is not possible to satisfy both the sound throughput of the speaker and the dustproof effect.

(c) Problems to be solved by the invention The invention provides a speaker having a simple structure and an easy-to-install cover mounting device that satisfies the above-mentioned problems, that is, the sound throughput and dustproof effect of the speaker, which are difficult to satisfy at the same time. system.

(d) Measures to solve the problem A flange and a plurality of positioning protrusions are provided on the inner peripheral surface of the opening of the front panel, and the periphery of the foam resin cover having ventilation holes is positioned by the positioning protrusions, and the flange is The cover is held between the front panel and the fixing frame, and the mounting legs of the fixing frame are fused to the front panel.

(E) Function When the foamed resin emits sound from the speaker, the sound pressure generates an airflow, the vents expand due to the airflow, and the sound waves pass through the cover and are transmitted to the outside. When no sound is being emitted, the ventilation holes are closed, preventing dust from entering.

Furthermore, since a flange and a plurality of positioning protrusions are provided on the inner peripheral surface of the opening of the front panel, the cover can be easily attached.

(f) Examples The present invention will be explained below with reference to FIGS. 1 to 3. FIG. 1 is an exploded perspective view of one embodiment of the present invention. 1 is made of foamed resin (e.g. urethane foam (polyester or polyether urethane foam), density 16-35Kg/m ² , elongation rate 80-80 200%,
This is a highly flexible cover with a compressive residual strain of 4.5% to 15%.

Reference numeral 2 denotes a fixed frame made of resin and having a plurality of mounting legs 2a around the periphery. 3 is a front panel made of resin, and has an opening 3a having a through hole 3b in the center facing the speaker 5, and a flange 3d formed on the inner circumferential surface 3c of the opening 3a, which is provided around the through hole 3b. It is being A plurality of semi-cylindrical positioning protrusions 3e are arranged on the inner peripheral surface 3c of the opening 3a at appropriate intervals,
The mounting legs 2 of the fixed frame 2 are attached to the peripheral edge 3f of the opening 3a.
A plurality of mounting holes 3g are provided at positions corresponding to a. It should be noted that if the mounting hole 3g is provided so as to coincide with the positioning convex portion 3e, a sufficient wall thickness up to the opening 3a can be ensured, which is desirable in terms of strength.

3h and 3i are protrusions for fitting a metal punching net 4 having a bent portion 4a around the periphery;
3j is a tweeter mounting portion. FIG. 2 is a perspective view showing the back side of the front panel 3, where 3k corresponds to a boss for attaching a speaker, and 3l corresponds to the boss 6a provided on the speaker box main body 6 in FIG. This is a boss that is tightened and fixed with a screw (not shown).

To attach the cover 1 to the front panel 3, the periphery 1a of the cover 1 is positioned by a positioning projection 3e provided on the inner peripheral surface 3c of the opening 3a. Since the positioning convex parts 3e are arranged at appropriate intervals and are formed in a semi-cylindrical shape, the cover periphery 1a is positioned in a state of point contact at several places, and the positioning is easy and the cover 1 is not deformed. It is done smoothly without any problems.

Next, hold the cover 1 between the flange 3d and the fixed frame 2 as shown in the cross-sectional view of the main part in FIG.
a into the mounting hole 3g provided on the periphery 3f of the opening 3a. Further, heat is applied to the tips of the mounting legs 2a to fuse them and fix the cover 1 to the front panel 3.

In addition, if the thickness of cover 1 is 8 mm or more, it will affect the sound throughput, and if it is too thin, the dustproof effect will be weakened.
About mm is appropriate. In FIG. 3, the dimension A between the cover mounting surface 3d1 of the flange 3d and the mounting surface 2b of the fixed frame 2 is set slightly smaller than the thickness of the cover 1, and the cover 1 is clamped so as to compress the periphery 1a. There is.

After the cover 1 is attached to the front panel 3 as described above, the punching net 4 is attached to the front panel 3, the speaker 5 is screwed to the front panel 3, and the speaker box body 6 is integrated with the front panel 3.

The speaker box assembled in this way is
The front of the speaker is covered with a foamed resin cover that has ventilation holes, so when sound is emitted from the speaker, airflow is generated by the sound pressure, and the ventilation holes expand due to the airflow.
The sound waves pass through the cover and are transmitted to the outside. Furthermore, when no sound is being emitted, the ventilation holes are non-linear holes with a diameter of 0.1 mm or less, so they are essentially closed, preventing dust from entering the inside of the speaker. In other words, this cover functions as an airflow valve that opens when sound is emitted and closes when no sound is emitted. Note that FIG. 1 is a perspective view showing the speaker 5 attached to the through hole 3b of the front panel 3, and FIG.
FIG. 3 is a perspective view of the back side of the front panel 3 before it is attached.

(g) Effects of the invention As explained above, the invention provides a dust-proofing effect for the speaker, does not impair sound penetration, and has a simple structure and is easy to install.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of an embodiment of the present invention, FIG. 2 is a rear perspective view of the front panel, and FIG. 3 is a sectional view of the main parts. 1... Cover, 2... Fixed frame, 2a... Mounting legs, 3... Front panel, 3a... Opening, 3c...
...Inner peripheral surface, 3d...Flame, 3e...Positioning projection, 3f...Aperture periphery, 3g...Mounting hole.

Claims (1)

[Claims for Utility Model Registration] An opening 3a having a through hole 3b facing the speaker 5, a flange 3d and a plurality of positioning protrusions 3e on the inner peripheral surface 3c of the opening, and a plurality of positioning protrusions 3e on the periphery 3f of the opening. A front panel 3 having mounting holes 3g; a foam resin cover 1 having ventilation holes; and a fixing frame 2 having a plurality of mounting legs 2a corresponding to the plurality of mounting holes 3g; Positioned by the positioning protrusion 3e of the front panel 3 and held between the flange 3d and the fixed frame 2, the mounting leg 2a of the fixed frame 2
is inserted into the mounting hole 3g of the front panel 3, and the tip of the mounting leg 2a is fused.