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JP2004187235

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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 JP2004187235
A speaker device capable of easily and accurately positioning a voice coil and a center of a
diaphragm. A magnetic circuit (13) including a magnet (14) and a yoke (11), a voice coil (16)
disposed in a magnetic gap (12) of the magnetic circuit (13), and a diaphragm (17) capable of
vibrating in a state of being coupled to the voice coil When the center position of the diaphragm
17 is aligned in the speaker device 10 in which the peripheral edge of the diaphragm 17 is fixed
to the housing 20, the concave portion 31 provided on the diaphragm 17 and the convex
provided on the housing 20 Positioning is achieved by engaging the portion 28a. In addition, it is
desirable to provide the recessed part 31 in the packing 30 stuck on the back surface of the
diaphragm. [Selected figure] Figure 5
Speaker device
TECHNICAL FIELD [0001] The present invention relates to a speaker device. 2. Description of the
Related Art Various speaker devices have been conventionally disclosed (see, for example, Patent
Document 1 and Patent Document 2). [0003] Further, as a speaker device that is often used for
home use and car use in recent years, there is one as shown in FIG. The speaker device 100 is of
a moving coil type, and an annular magnet 104 is disposed on the top of the pole yoke 106, and
an annular plate 105 is disposed on the top of the annular magnet 104. A magnetic circuit 107 is
formed by the pole yoke 106, the annular magnet 104, and the annular plate 105. The voice coil
102 wound around the end of the voice coil bobbin 103 is disposed in the magnetic gap 107 a of
the magnetic circuit 107, and the voice coil bobbin 103 is a central portion of the cone paper
101 which is a substantially conical diaphragm. It is fixed to the hole. A cap 113 is attached to
the central hole. An edge 108 is provided on the outer peripheral portion of the cone paper 101
and is attached to the outer peripheral portion of the frame 112 through a paper packing 114.
The central portion of the cone paper 101 is supported by the frame 112 via a damper 109. As a
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result, in the state where the cone paper 101, the voice coil 102 and the voice coil bobbin 103
are integrated, it is possible to vibrate in the central axis X direction of the speaker device 100. In
addition, positive and negative input terminals 110 are attached to the frame 112, and both ends
of the voice coil 102 are electrically connected to the positive and negative input terminals 110
through lead wires (twin wire) 111, respectively. Then, when a drive signal (drive current) is
supplied from the external power supply to the input terminal 110, the voice coil 102 receives an
electromagnetic drive force corresponding to the drive signal in the magnetic gap 107a of the
magnetic circuit 107, As a result, the voice coil 102 vibrates integrally with the voice coil bobbin
103 and the cone paper 101 in the central axis X direction of the speaker device 100, and the
cone paper 101 emits acoustic energy according to the drive signal. In some cases, a magnetic
circuit is formed by using an exciting coil acting as an electromagnetic magnet instead of the
magnet 104. [Patent Document 1] Japanese Patent Publication No. 56-15196 (Page 1, FIG. 1)
[Patent Document 2] Japanese Utility Model Application Publication No. 57-106387 (Page 2-3,
FIG. 1) In the case of the prior art as described above, paper is used for the packing 114 of the
cone paper 101, and centering is performed visually when the cone paper 101 is attached.
For this reason, it is difficult to center the voice coil 102 and the cone paper 101 accurately, and
there is a problem that the cone paper 101 may be attached obliquely. Further, since the packing
114 of the cone paper 101 is a paper, there is a problem that it is difficult to detect distortion of
the edge 108 due to molding from the appearance. One of the problems to be solved by the
present invention is, as an example, the problem of the center deviation of corn paper which
occurs in the above-mentioned prior art. A speaker device according to the present invention
described in claim 1 is a magnetic circuit including a magnet and a yoke, a voice coil disposed in
a magnetic gap of the magnetic circuit, and the voice coil. It is a speaker apparatus provided with
the diaphragm which can be vibrated in the state couple ¦ bonded with the voice coil, The
peripheral part of the said diaphragm is being fixed to the housing ¦ casing, Comprising: The said
diaphragm is the recessed part provided in the said diaphragm It is characterized by positioning
by engaging with a convex part provided in the case. BEST MODE FOR CARRYING OUT THE
INVENTION An embodiment according to the present invention will be described based on the
drawings. 2 is a cross-sectional view of the speaker device according to the present invention,
FIG. 3 is a front view of the speaker device, and FIG. 4 is a rear view of the speaker device. The
speaker device 10 has a yoke 11 at the center, and an annular magnet 14 and an annular magnet
forming a magnetic circuit 13 by forming a magnetic gap 12 with the yoke 14 on the outside of
the yoke 11 It has a plate 15. The magnet 14 may be excited by a direct current power source or
may be a permanent magnet. A voice coil 16 made of a thin copper wire or the like is provided in
the magnetic gap 12 so as to be movable back and forth, and this voice coil 16 is attached to the
central hole of cone paper 17 which is a roughly conical diaphragm. There is. A cap 18 is
mounted in front of the central hole of the cone 17. On the rear surface of the yoke 11, a circular
mounting surface 21 constituting a frame 20 as a housing is attached by a screw 22. From the
mounting surface 21, a plurality of yokes 11 and magnets 14 are enclosed. Arms 23 (five in this
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case) are provided so as to radially spread forward. A terminal support ring 24 is attached to an
intermediate position of the arm 23, and a pair of speaker terminals 25a and 25b for positive
and negative electrodes are attached to a lower part of the terminal support ring 24.
The voice coil 16 is electrically connected to the positive and negative speaker terminals 25a and
25b through lead wires 26 and 26 respectively. Further, a damper 27 is provided between the
terminal support ring 24 and the cone paper 17 so as to support the voice coil 16 so as to be
accurately positioned in the magnetic gap 12. The damper 27 has elasticity so as to flexibly
follow the back and forth movement of the voice coil 16. Further, a ring portion 28 is integrally
provided at the tip of the arm 23, and an outer peripheral edge 17 a of the cone paper 17 is
attached to the ring portion 28. A plurality of edges 17 b are provided concentrically in the
vicinity of the outer peripheral edge of the cone paper 17. The edge 17 b is bent in a
substantially arc shape, so that the cone paper 17 can be vibrated smoothly, and abnormal
movement at the time of vibration is suppressed. Therefore, when a signal current flows from the
speaker terminals 25 a and 25 b connected to the external power supply to the voice coil 16, the
voice coil 16 generates a magnetic field, and the voice coil 16 operates back and forth by the
action with the magnetic circuit 13. Vibrate. As a result, the cone paper 17 vibrates back and
forth to generate sound as a compressional wave of air. FIG. 5 shows an attachment portion of
the outer peripheral edge 17 a of the cone paper 17 to the ring portion 28 of the frame 20, that
is, an enlarged view of the V position in FIG. A cone packing 30 as a packing is attached to
the back surface (right side surface in FIGS. 1 and 5) of the outer peripheral edge 17a of the cone
paper 17, and a recess 31 is formed on the back surface side of the cone packing 30. The cone
packing 30 is made of a hard material such as bake. On the other hand, a convex portion 28 a is
provided on the front surface (right side surface in FIGS. 1 and 5) of the ring portion 28 of the
frame 20. Therefore, the cone paper 17 is positioned by fitting the convex portion 28 a of the
ring portion 28 into the concave portion 31 of the cone packing 30, and the cone paper 17 is
attached to the frame 20. The sizes of the concave portion 31 and the convex portion 28 a are
set to have no rattling so that the ring portion 28 can be positioned by fitting the convex portion
28 a to the concave portion 31. If possible, it is desirable that the convex portion 28a be
expanded in a tapered manner from the distal end portion to the proximal end portion, and the
size of the concave portion 31 be slightly smaller than the proximal end portion of the convex
portion 28a.
The position of the convex portion 28 a and the position of the concave portion 31 are
positioned so that the voice coil 16 attached to the cone sheet 17 is positioned at the center of
the magnetic gap 12 when the cone sheet 17 is positioned by both. Then put. According to the
speaker device 10 described above, the cone paper 17 is made to be a predetermined one of the
frame 20 by fitting the concave portion 31 provided on the cone paper 17 to the convex portion
28 a provided on the ring portion 28 of the frame 20. It can be positioned. As a result, since the
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center alignment of the voice coil 16 and the cone paper 17 can be easily and accurately
performed without using a separate jig, the straightness of the stroke of the voice coil 16 can be
improved. Further, since the cone packing 30 attached to the cone paper 17 is formed of a hard
material such as baking, the positioning of the cone paper 17 with respect to the frame 20 can
be performed accurately, and the edge 17 b by molding Distortion can be detected from the
appearance. In addition, since the thin cone packing 30 is provided with the concave portion 31
instead of providing the convex portion, processing is easy. Note that the speaker device 10 of
the present invention is not limited to the above-described embodiment, and appropriate
modifications, improvements, and the like can be made. For example, in the above embodiments,
a cone-shaped speaker device has been described, but the present invention can be applied to a
dome-shaped speaker device as well. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a crosssectional view showing a conventional speaker device. FIG. 2 is a cross-sectional view showing an
embodiment of a speaker device according to the present invention. 3 is a front view seen from
the direction III in FIG. 2; FIG. 4 is a rear view seen from the IV direction in FIG. 5 is an enlarged
cross-sectional view of a V position in FIG. 2; [Description of the code] 14 magnet 11 yoke 13
magnetic circuit 12 magnetic gap 16 voice coil 17 cone paper (diaphragm) 20 frame (housing)
10 speaker device 31 concave portion 28a convex portion 30 cone packing (packing)
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