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JPH09179562

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH09179562
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electromagnetic speaker which is used as a sound emitting device (such as call, notification,
alarm, etc.) in the fields of home appliances, office automation equipment, automobiles, watches
and the like.
[0002]
2. Description of the Related Art In recent years, small and thin electromagnetic sounding bodies
have been attracting attention as acoustically vibrating electromagnetic sounding bodies, and the
structure thereof has become more complex as multifunctionalization progresses.
[0003]
Here, a conventional electromagnetic speaker that is generally mounted and used on a circuit
board will be described with reference to the drawings.
[0004]
6 and 7 show the construction of a conventional electromagnetic type sounding body, and as can
be seen in the figure, the center pole 23a of the plate 23 is centered on the plate (yoke) 23 on
which the magnet (permanent magnet) 25 is mounted. And a coil 24 is mounted to form a field
section, and a support stage on the upper portion of the frame 26 in which a diaphragm 20
composed of a diaphragm 21 with high permeability and a suspension 22 is coupled to the field
section via a narrow gap 27 The peripheral portion is held by the portion.
03-05-2019
1
[0005]
In the above configuration, the diaphragm 20 is attracted and supported in advance by the plate
23 for a DC magnetic field by the magnet 25, but when an AC signal is applied to the coil 24
through the terminal 31 coupled to the bottom of the frame 26 The alternating current magnetic
flux generated thereby is superimposed on the direct current magnetic field, and the suction
force of the plate 23 generated due to the alternating current magnetic flux changing in
accordance with the frequency of the alternating current signal causes the diaphragm 20 to
vibrate and generate sound.
The generated sound is amplified by the cavity 28 in the resonance case 30 and emitted to the
outside through the sound emission hole 29.
[0006]
However, the above-described conventional electromagnetic type sound generator is difficult to
handle because it has a large number of parts and is small, and is not excellent in mass
productivity.
[0007]
The present invention solves such conventional problems, and provides an electromagnetic
speaker that can cope with automation of a manufacturing process.
[0008]
SUMMARY OF THE INVENTION In order to solve the above problems, an electromagnetic type
sounding body according to the present invention comprises a terminal comprising a pair of
terminal legs and a terminal provided with a feed pitch hole and continuously provided in a hoop
shape; A plate having a center pole, a resin casing formed by resin molding the terminal and the
plate, a coil having both ends connected to the terminal foot and disposed around the center
pole, the plate , A vibration plate disposed on the center pole driven by the field portion including
the plate, the magnet and the coil, and a resonance having a sound emission hole covering the
vibration plate and the field portion Since the case and the case are continuously formed, the
hoop-shaped terminal and the plate are continuously and integrally formed on the resin case, and
the magnet, the coil, and the vibration are formed on this. Those capable of providing a
configured automated production possible electromagnetic sounding body by mounting plate
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2
and resonance case or the like.
[0009]
According to the first aspect of the present invention, there is provided a terminal having a feed
pitch hole and a pair of terminal legs and terminals continuously provided in a hoop shape, and a
plate having a center pole. A resin casing formed by resin molding the terminal and the plate, a
coil whose both ends are connected to the terminal foot and arranged around the center pole, a
magnet mounted on the plate, The diaphragm is disposed on the center pole driven by the field
portion including the plate, the magnet, and the coil, and the resonance case having the sound
emission hole covering the diaphragm and the field portion. The terminal and plate continuously
formed in the hoop shape are continuously produced integrally with the resin case, and the
magnet, the coil, the diaphragm, the resonance case, etc. are formed thereon. Those capable of
providing a configured automated production possible electromagnetic sounding body and wear.
[0010]
Hereinafter, an embodiment of a speaker according to the present invention will be described
with reference to FIGS. 1 to 5.
[0011]
FIG. 1 is a plan view of an electromagnetic speaker according to an embodiment of the present
invention, FIG. 2 is a front sectional view of the same A-O-B, FIG. 3 is a partially broken
perspective view showing the internal structure, and FIG. The top view of the terminal which is a
principal part, FIG. 5 is an expanded example which shows integral molding of the terminal and
plate which are principal parts.
[0012]
As shown in the figure, the diaphragm 3 is constituted by the diaphragm 1 and the suspension 2,
and the peripheral portion is fixed to the upper end of the internal partition of the first resin
casing 9 having the resonance case 9a as the upper lid and mounted. It is done.
[0013]
The reference numeral 7 denotes a field unit for driving the diaphragm 3, which is composed of
the plate 4, the magnet 5 and the coil 6, and the first resin casing 9 and the diaphragm via the
lower surface of the diaphragm 3 and the gap 10. Sealed inside by 3 enclosed.
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[0014]
Reference numeral 11b denotes a resin bobbin that insulates and couples the plate 4 and the
terminal 8, and the resin bobbin 11b has a ring-shaped stopper 11a at one end of the plate 4 in
contact with the tip of the center pole 14 to form a second resin case. Body 11 is composed.
[0015]
Also, terminal 8 has positive and negative poles respectively, so it is split into two parts across
the central hole.
[0016]
Reference numerals 12 and 13 denote a pair of terminals for transmitting an input signal from
the outside to the coil 6 provided by extending the terminal 8, and 12a and 13a are also
integrally provided on the terminal 8. It is a pair of terminal legs for respectively winding the
wire of the both ends of a winding start and a winding end.
[0017]
That is, as shown in FIG. 3, after bonding the resin bobbin 11 b provided at the central portion of
the second resin casing 11 to the terminal 8, first, the winding start portion 6 a of the coil 6 is
the terminal foot 12 a of the terminal 12 The coil 6 is wound around the resin bobbin 11b, and
the winding end portion (not shown) of the coil 6 is wound around the other terminal foot 13a
(not shown).
[0018]
Next, by electrically connecting the terminal feet 12a and 13a and the winding start portion 6a
and the winding end portion of the coil 6 with laser solder etc., the winding process of the coil 6
centering on the center pole 14 to the soldering process It is possible to do it automatically.
[0019]
Furthermore, as shown in FIG. 4, if a large number of terminals 8 are connected by runners 17 to
form an annulus, continuous assembly and molding methods become possible, and the position
setting in each process can be easily made with feed pitch holes 18. It can be carried out.
[0020]
That is, as shown in FIG. 5, the terminal 8 and the plate 4 are molded by the second resin casing
11 together with the resin bobbin 11b and the stopper 11a, so that continuous and continuous
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4
automatic production becomes possible including the subsequent assembly. is there.
[0021]
Furthermore, the first resin casing 9 can also be completely sealed inside the electromagnetic
sounding body by the molding method, and it is acoustically also mounted on the circuit board
without the need for an adhesive. However, it is possible to provide an excellent electromagnetic
speaker.
[0022]
As described above, in the electromagnetic speaker according to the present invention, the
terminal and the plate continuously formed in the hoop shape are continuously produced
integrally with the resin casing, and the magnet, the coil, and the like are formed thereon. It is
possible to provide an automatically producible electromagnetic type sounding body configured
by mounting a diaphragm, a resonance case, and the like.
[0023]
Brief description of the drawings
[0024]
1 is a plan view of an electromagnetic speaker according to an embodiment of the present
invention.
[0025]
2 front sectional view in A-O-B of FIG. 1
[0026]
Fig. 3 Partially broken perspective view showing the same internal structure
[0027]
Fig. 4 Top view of the terminal which is the main part
[0028]
Fig. 5 Side sectional view for explaining the molding condition of the terminal and the plate
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[0029]
Fig. 6 A plan view of a conventional electromagnetic speaker
[0030]
Figure 7 same front cross section
[0031]
Explanation of sign
[0032]
DESCRIPTION OF SYMBOLS 3 diaphragm 4 plate 5 magnet 6 coil 6a winding start part 7 field
part 8 terminal 9 1st resin housing 9a resonance case 11 2nd resin housing 12 13 terminal 12a
13a terminal foot 16 sound emitting hole
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