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JPS5350628

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DESCRIPTION JPS5350628
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded view of a horn type speaker
according to the present invention, FIG. 2 is a sectional view after assembly, FIG. 3 is an enlarged
perspective view of a pressure lid 1, and FIG. It is a perspective view of a horn type speaker. 1a is
a horn portion, 1b is a support portion, 1 is a main body, 1g is a locking groove, 4a is a wedgelike protrusion, 4 is a pressing lid, 3 is a magnetic circuit portion, 3b is a yoke, 1e is a locking
step portion, 2 is The vibration system unit 1e is a peripheral support unit.
DETAILED DESCRIPTION OF THE INVENTION This invention relates to the construction of a horn
type speaker which has a reduced number of parts and which is extremely easy to assemble. An
example of a conventional horn-type speaker will be described with reference to FIG. 4. A domeshaped diaphragm and a voice coil are wound in advance on a magnetic circuit unit 41
assembled in advance. The vibration system unit 42 is fixed to the spacer 42a by several places
in order to apply a certain pressure to the spacer 42a using a gauge or the like so that the voice
coil is positioned at the center of the magnetic gap. The horn portion 43 is bonded to the top
surface of the magnetic circuit portion 41 from the upper side by bonding or by a screw or the
like. However, in the conventional structure of such a horn-type speaker, in addition to requiring
a large number of screws and adhesive fixing parts, the operation of forming the screw holes on
the upper surface of the magnetic circuit portion or the respective parts concentrically As a jig
for fixing is required, the assembling operation is extremely troublesome. Especially in many
horn tweeters, the horn part and the magnetic circuit part are adhered and fixed, but in such a
structure, the defect part can not be easily replaced even if it is found that the part is defective
after assembly. I had it. In this invention, the horn portion and the magnetic circuit support
portion are integrally formed, and the assembly can be completed in the process of only inserting
the vibration system portion and the magnetic circuit portion at the center of the support
portion. The horn-type speaker is configured to be disassembled into two, and will be described
in more detail with reference to FIGS. 1, 2 and 3. FIG. 1 is an exploded cross-sectional view of the
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horn type speaker according to the present invention, in which 1 is an inner wall supporting a
magnetic circuit portion 3 including a horn 1a, a magnet 3a yoke 3b and a center pole 3c It is a
frame integrally formed with a '-' support portion 1b having 1f, and a flange 1d having a
mounting hole 1c to be fixed to a baffle plate (not shown) is formed on the front surface thereof.
Behind the bottom of the horn 1a is formed a locking step 1e for locking the outer peripheral
edge of the vibration system 2 consisting of a spacer 2d made of an elastic material and a dome
diaphragm 2a1 voice coil 2c1 coil bobbin 2b1 peripheral support 2es. ing. Further, a locking
groove 1g surrounding the pressing lid 4 is provided in the vicinity of the rear opening of the
inner wall 1f, and a part of the rubber 4g is a wedge-shaped projection provided on the outer
periphery of the pressing lid 4 in the locking groove. The opening is followed by a notch 1h
corresponding to the width of 4a. As shown in the enlarged view of FIG. 3, the presser lid 4 is
provided with at least two wedge-shaped projections 4a on the outer peripheral edge thereof,
and the wedge-shaped projections 4a are formed so as to gradually increase in thickness along
the circumferential direction. At the same time, a protrusion 4b to be in contact with the
magnetic circuit portion 3 is provided on the inner surface of the pressing lid 4 and a rotation
groove 4t is provided on the outer surface.
[1 character, ']] In order to assemble a horn type speaker of such a structure, a coil bobbin 2b
having a peripheral support 2e and a voice coil 2c wound in advance is adhered to a dome
diaphragm 2a, and then a spacer 2d and the periphery After the support portion 2e1 and the
spacer 2d are locked in order to the locking step portion 1e, the magnetic circuit portion 3 is
inserted along the inner wall 1f of the support portion 1b. Next, the wedge-shaped projection 4a
of the presser lid 4 is inserted according to the notch 1h, a driver or the like is inserted into the
rotation groove 4c, and the presser lid is rotated to complete the assembly. Since the vibration
system 2 is locked to the locking step 1e and the magnetic circuit 3 is locked by the inner wall 1f
of the support 1b, and the centers of each are aligned with the center of the main body 1, the
Heus coil 2c is Correctly placed in the magnetic gap. When the presser lid 4 is pivoted, the
wedge-shaped projection 4a is pivoted along the groove 1g, and as the pivot is pivoted, the
wedge slope of the wedge-shaped projection 4a abuts on the wall of the locking a and the presser
lid 4 travels forward 1-g, whereby the magnetic circuit unit 3 is pushed forward via the
projection 4b provided on the inner surface of the presser lid 4 and between the yoke "-3b front
surface and the locking step 1e The peripheral support portion 2e is pressed and held by the
outer peripheral edge through the spacer 2d. As described above, according to this invention, the
number of parts is small in assembly, and no jig is required in the assembly, and the process of
inserting the parts into the main body and rotating the presser lid is extremely simple. Be done.
Further, since the respective parts are arranged with the center of the main body as a reference,
the positional relationship between the respective parts is extremely accurate, and the diaphragm
peripheral support portion is a constant pressing in accordance with the 6 rotation angles of the
pressing lid. Since the pressure is held by the pressure, it is possible to prevent the deterioration
of the high-pitched sound. Furthermore, when a defect is found after assembly, it has an
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extremely excellent effect in practical use, such as being able to simply replace the defective part
by removing the presser lid.
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