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Patent application title: Back Cavity for Medium to High Tone Loudspeaker and Method of
Manufacturing the Same
2, the scope of claims
3. Detailed Description of the Invention The present invention relates to a lock cavity of a middle
to high-tone speaker. In order to prevent the medium and high-pitched speaker from being
adversely affected by the sound emitted from the back of the low-pitched speaker close to the
middle-to-high-pitched speaker, (in many cases, ivy cavities are provided) It is normal. Recently, it
has become popular to use foam concrete having open cell pores, foam of metal such as
aluminum or foam plastic as a sound absorbing material of the back cavity. An object of the
present invention is to provide a back cavity which has a sound absorbing material made of foam
having open cell pores and which is simple in structure and easy to manufacture. Another object
of the present invention is to provide a method of manufacturing such a back cavity. FIG. 1
shows a cross section of the back cavity of a high to high frequency speaker according to the
present invention. (1) is a block of foam having open cell holes, and the foam block is made of
concrete, aluminum, plastic or the like. At one end of the foam (1), a hooked annular body (2) is
provided as a speaker supporting means. The end face of the foam on the side to which the
annular body (2) is attached is provided with a mounting hole (3) for attaching the speaker
directly or through the baffle plate on the annular body (2) In order to improve the sound
absorption characteristics, it is processed to open the bubble hole. The exposed side and bottom
of the foam block (1) are covered by a gas tight membrane (4). The hermetic membrane (4) is
made of a suitable synthetic resin or the like. The back cavity having the above-described
structure has sufficient sound absorption characteristics due to the presence of the airtight film
(4), but is easy to manufacture because of its simple structure. This is a case where the storage
case of the sound absorbing material used in the conventional one is omitted by utilizing the fact
that the foam block (1) has a strength of 9. Next, a preferred method 4c) of manufacturing the
bath cavitation as described above with reference to FIGS. Light up. In manufacturing the back
cavity of FIG. 1, first, a columnar foam block (1 ') as shown in FIG. 2 is formed using a cylindrical
mold. Then, a column block (one is cut into a desired length in a plane substantially
perpendicular to the axial direction thereof to make a small profile as shown in FIG. 3). Next, in
order to provide an airtight film on the exposed surface of the foam block (1), the exposed
surface is dipped in a resin solution (5) as shown in FIG. 5, and then pulled up and dried. You
may apply ¦ coat with a brush etc., without being immersed in this braided resin solution.
As a resin solution, unlike a vinyl acetate emulsion or the method described above, a bag-like film
(6) made of a heat-shrinkable resin is covered as shown in FIG. 6 so as to cover the exposed
surface of the foam block (1). After being provided, the bag-like membrane (6) can be contracted
by heating to obtain the airtight membrane (4). In addition, it is desirable that the thickness of
the airtight film be about 10 μ or more, which is a thickness that does not cause pinholes. By the
above-described manufacturing method, the desired back cavity can be obtained by a small
number of steps without requiring complicated machining.
4. Brief Description of the Drawings FIG. 1 is a sectional view showing a back cavity according to
the present invention, and FIGS. 2 to 6 are views showing steps of a manufacturing method for
obtaining the back cavity of FIG. DESCRIPTION OF MAIN CODES 1 ··· · · · · · · · · · · · · · · · · · · · · · ·
Annulus 3 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · airtight film 5 ........ resin bath 6 ......... heat-shrinkable
resin applicant Pioneer Corporation EndPage: 2
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