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DESCRIPTION JPS4917287

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DESCRIPTION JPS4917287
[Phase] sound reproduction device ■ Japanese Patent Application No. 44-89290 出 願
Application No. 44 (1969) November 10 @ inventor Sawada Yasushi-165 same-body of
Sakaemachi 1 Kawaguchi City Aki 2992 Oizumi Gakuencho Nerima-ku Tokyo Tokyo Applicant
Kawase Bussan Co., Ltd. 10 Chuo-ku, Tokyo Ginza 4 10 attorneys Shigeo Inoue
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view, FIG. 2 is a cross-sectional view
taken along the line XX in FIG. 1, and FIG. 3 is a diagram showing an embodiment of the sound
reproducing apparatus according to the present invention. It is sectional drawing of the damper
used.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sound
reproduction apparatus using a wall plate or the like as an acoustic vibrator. The present
inventors previously connected the voice coil using a conducting wire having a magnetic coating
layer to a diaphragm of a mechanical system, and attached the diaphragm to a plate such as a
wall plate or a ceiling. Has proposed an acoustic reproducing apparatus in which an acoustic
vibrator is used, but recently, an apparatus similar to this has also been proposed. The point to be
considered in this kind of device is how to properly maintain the center of the voice coil and the
diaphragm and to adopt the configuration to secure the linearity of the voice coil's vibration. In
the device disclosed in this regard, the outer periphery of the diaphragm is screwed and fixed to
the outer casing or the like of the magnetic circuit portion. In this type of device attached to a
wall or the like through a diaphragm, the diaphragm itself must have a mechanical strength that
is high enough to support the main body, and therefore must be thick. When the outer peripheral
edge is fixed [111111], conversion from electrical system vibration to mechanical system
vibration can not be performed sufficiently or faithfully. One of the objects of the present
invention is to solve the above problems. Another object of the present invention is to miniaturize
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and therefore reduce the weight of the device, which is an important factor in connection with
such a device to be supported by a wall or the like. Still another object of the present invention,
which is related to the above two objects, is to achieve faithful sound reproduction without
requiring a large input. In order to achieve each object of the present invention, the present
invention has a magnetic coating layer on the outer periphery and further connects a voice coil
formed by a conducting wire having an insulating film on the outer periphery to the lower
surface of the diaphragm The damper is formed with a T-shaped cross-section side so as to form
a jetty above and below the outer end of an annular elastic body made of rubber or the like, and
a recess is provided around the outer peripheral surface to form a damper And fixed between the
outer peripheral edge of the diaphragm and the plate or the outer housing. Embodiments of the
present invention will be described below with reference to the drawings. The diaphragm 1 is
made of aluminum in consideration of heat dissipation, is rectangular, and has attachment holes
1a at each corner. Further, an annular protrusion 1 b is provided at the center of the lower
surface, and the bobbin of the voice coil 2 is connected thereto by an adhesive or the like. An
annular protrusion 1 c is also formed on the diaphragm 1 near the outer edge of the lower
surface. The voice coil 2 has a magnetic coating layer on the outer periphery of the conductor,
and is further formed using a conducting wire having an insulating film on the outer periphery
thereof. Such leads are known per se, but in the present device, in particular by using them, it is
possible to improve the performance and to miniaturize the device, and hence to reduce the
weight, as will be described later.
The magnetic circuit was of the external magnet type composed of the pole 5, the yoke 6, the
toroidal magnet 7 and the plate 8. A damper 4 is made of rubber and has an annular shape, and
is formed in a T-shape on the cross-section side so that the ridge portions 4a and 4b are formed
on the upper and lower outer peripheral surfaces, and concave grooves [111111] 14c is
provided. The recessed groove 4 c is extremely effective for faithful vibration of the diaphragm 1.
A portion of the upper jetty portion 4 a is cut away to lead out the terminals 9 and 9 of the voice
coil 2. At the time of installation in the magnetic pole air gap of voice coil ≦, the jetty portion 4b
of the damper 4 and the jetty portion 4a at the rim of the outer body of the plate or the rim of
the casing which may be separately attached. It abuts on each of the annular projecting portions
IC and is fixed with an adhesive or the like. In the present invention, as described above, the voice
coil 2 has the magnetic coating layer on the outer periphery of the conductor and the lead wire
further insulatingly coated the outer periphery is used, so that the voice coil 2 can maintain the
floating state in the pole gap. Centering is easy and installation of the voice coil 2 at the time of
assembly can be made in all. Although the theoretical explanation that the voice coil 2 causes the
floating phenomenon in the magnetic pole gap as described above has not been made, other
configurations, for example, one in which magnetic powder is coated on the outer periphery of
the voice coil, a copper wire and an iron wire If it is experimentally found that the voice coil is
attracted to one side of the magnetic pole in the coil wound alternately, etc., in the voice coil 2
used in the present invention, each magnetic pole of the magnetic covering layer on the outer
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periphery of the conductor It is expected that the corresponding ml will be magnetized to the
same polarity as the pole, and the pole and coil will be displaced. The fact that the voice coil 2 is
in the floating state in the magnetic pole gap 1 also shows up as another advantage that the
magnetic pole gap can be narrowed to the range where the L = llT movement of the voice coil 2
is possible. Since there is no need to take care of not contacting the pole or the plate, the voice
coil 2 is automatically held in the center, which is an assembly technique-"-advantageous. Besides
being able to increase the magnetic flux density, structurally narrowing the pole gap is also
advantageous in reducing the size and weight of the device itself. That is, in order to prevent the
increase of the leakage flux in general, the gap p from the pole 5 to the magnet 7 (in the case of
the internal magnet type, the gap from the magnet to the yoke) is [111111], but as described
above The above-mentioned narrowing of the gap p makes it possible to reduce the size and
weight of the device.
In addition, in order to properly vibrate the diaphragm requiring a certain degree of mechanical
strength, a considerable amount of human power is required, and in the case of a normal voice
coil, the size of the coil itself and the related apparatus is inevitably increased. However, when
the voice coil is configured as in the present invention, it is successful in reducing the required
human power by faithful vibration conversion accompanied by the substantial narrowing of the
pole gap. Of course, this is not due to the voice coil alone, but occurs synergistically with the
effect of the damper 4. The damper 4 holds the main body of the apparatus, can prevent the
cushioning effect and the faithful vibration of the diaphragm 1 from being inhibited by the
presence of the concave groove 4C, and can properly maintain the center of the voice coil 2. As
described above, according to the present invention, the assembly is simple by the diaphragm 1,
the damper 4 and the like which are uniformly manufactured, so that it is suitable for mass
production, and the miniaturization can be achieved. It has excellent features such as extremely
small human power and faithful sound reproduction as compared with existing devices.
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