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DESCRIPTION JPS50117712

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DESCRIPTION JPS50117712
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cut away side view of a
conventional sound box, and FIG. 2 is a partially cut away side view of a sound box according to
the present invention. E · E · · · · electrical components. Figure 1 Figure 2 27 1
[Detailed description of the invention] Sound I used for calling etc. such as ^ C telephones etc.
with this invention ホ. # The acoustic output of the converter is a must! The structure of the
sound box to make it sound until you get a good sound. The conventional structure of the Sano
“Hox, which is inside t.t = & Scream and is used for ringing / flicking the sound of the sound I #
used for calling etc., as shown in FIG. , Formed into a box shape from a plurality of side plates 2
erected on the bottom plate 1 of the telephone main body 1 and & here and the lid plate 4 and
the acoustic transducer 3 or 1- The acoustic output of the acoustic transducer 3 is such that the
required sound can be obtained by resonating in the space (referred to as a front air chamber) 5
of the box-shaped sound box. In such a conventional sound box structure, various electric
components constituting an electric circuit for operating the acoustic converter 3, in other words,
a printed circuit board to which these electric components are attached, the sound box and the
like Is generally provided separately and installed at another place in the telephone. In the case
of small intercoms or telephones, etc. which are restricted by the rounding and the internal
space, the attachment of the sound box for the structure and the electrical component for
operating the acoustic transducer is not preferable O for the purpose of downsizing the
apparatus. OBJECTS OF THE INVENTION In view of the disadvantages of the prior art
construction as described above, by integrating the acoustic transducer operating electrical
components and the sound box into an integral structure], a compact sound box construction is
obtained], The object of the present invention is achieved by configuring a lid plate with an
acoustic transducer brazed by a printed circuit board on which the electrical component for
operating the acoustic transducer is attached. Hereinafter, the present invention will be described
using an embodiment of the sound box according to the present invention. In FIG. 2, the sound
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box 6 # -i according to the present invention has a plurality of side plates 8 erected on the
bottom plate 7 of a telephone or the like as in the conventional structure shown in FIG. The cover
plate 9 is used as a cover to cover the The lid plate 9Fi acoustic transducer 10 is attached to the
upper surface thereof, and the acoustic output of the acoustic transducer 10 is transmitted
through the acoustic holes 11 formed corresponding to the acoustic radiation surface of the
acoustic transducer 10 and the bottom plate 1 and into the front air chamber defined by the side
plate 8 and the cover plate 9; Thereby, the sound of the acoustic transducer 10 is resonated in
the front air chamber 12 to obtain the required sound.
The lid plate 9 has a glint circuit formed on the front surface or the back surface, and a plurality
of component mounting holes are drilled at 4 to generate electricity for operating the acoustic
converter 10. Individual electrical components 13 are attached. Of course, it is attached to the
peripheral position of the acoustic transducer 10 so that the installation of the electrical
component 13 # 'i- the acoustic transducer 10 is not hindered. Preferably, the electric part 13 is
dispersed on the upper surface of the cover plate 9, but the volume of the air chamber 120 is
small, that is, the lower surface, ie, the front air chamber 12 if it does not affect the resonance
frequency. May be braised. As is apparent from the above description, one invention is made. The
sound box uses a printed circuit board or the like on which the electric component 13 for
operating the acoustic converter is attached as a cover plate of the sound box. Therefore, it is not
necessary to separately provide a printed circuit board on which the electric component is
mounted. There is an effect that it is possible to provide a compact interphone, a telephone etc.
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