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JP2008263515

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DESCRIPTION JP2008263515
An object of the present invention is to secure sound performance while realizing small size
(small diameter) and thin speaker with low cost. SOLUTION: In a speaker in which a circular
voice coil 2 is coupled to any one of a rectangular, a track, and an elliptical diaphragm 1 and
used, the voice coil 2 is disposed at an inner diameter of an edge portion 1c of the diaphragm 1.
A pair of reinforcing portions 1e sandwiching the coupled portion 1b joined in the major axis
direction of the diaphragm 1 is provided, and the reinforcing portion 1e is also functioned as a
diaphragm to obtain an effective diaphragm area, and a deformed shape before voice coiling is
formed. Get the same effective diaphragm area as the speaker. [Selected figure] Figure 1
スピーカ
[0001]
The present invention relates to a speaker used in electronic devices and information devices,
and more particularly to a small speaker used in a mobile phone or the like.
[0002]
A dynamic speaker is one of the typical speakers used in electronic and information devices.
The structure of this speaker is basically based on a frame provided with an external connection
terminal, a magnetic circuit consisting of a yoke, a magnet and a pole piece, a diaphragm made of
a resin or metal film, and a voice coil coupled to the diaphragm. Thus, the frame holds the
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magnetic circuit at the central portion, holds the outer peripheral portion of the diaphragm at the
outer peripheral portion, and the voice coil is inserted into the magnetic gap formed in the
magnetic circuit. When current is supplied to the voice coil through the external connection
terminal, the voice coil vibrates up and down, and the diaphragm vibrates accordingly to emit a
sound. For example, in the case of a mobile phone, such a speaker is positioned and attached to
the inside of a sound hole provided in a housing in a state where an external connection terminal
is electrically connected to a circuit board incorporated in the housing; It is used as a receiver to
play, a speaker to play music, radio and television broadcast audio in addition to ringtones and
ring tones.
[0003]
In recent years, as the size and thickness of mobile phones have been reduced, the mounting
space for speakers has been reduced due to the increase in size of liquid crystal screens and
addition of digital camera functions. In addition, mobile phone terminals with enhanced music
playback function, radio and television, and one segment reception function are increasing. As a
result, the speaker used in the mobile phone is required to improve the output sound pressure
and the sound quality as well as to make it smaller (small aperture) and thinner, but the circular
(round) magnetic circuit, diaphragm, When attempting to reduce the diameter with a
conventional circular (round shape) speaker (see, for example, Patent Document 1) using a voice
coil, there is a problem that the output sound pressure is reduced and the sound quality is
deteriorated.
[0004]
Also, a track-type speaker (for example, Patent Document 2) realized by track formation of a
magnetic circuit, a diaphragm, and a voice coil, which has been circular conventionally, has a
minimum of about 10 mm of the conventional one While maintaining the same acoustic
performance as before while reducing the aperture diameter, the manufacturing cost of the track
type voice coil is high (compared to the circular voice coil) and the product cost is high
(compared to the circular speaker) There was a problem. JP, 9-135491, A JP, 2000-201396, A
[0005]
The problem to be solved by the present invention is to connect and use a circular voice coil to
the track-shaped diaphragm with the above-mentioned track-shaped speaker, or to use a circular
or rectangular diaphragm with a rectangular or elliptical speaker. By combining and using voice
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coils, it is possible to realize the same product cost as a circular speaker with these unusual
(against circular) speakers, which greatly contributes to the prior art, but it has a track shape, a
rectangular shape and an elliptical shape. If a circular voice coil is combined with a diaphragm of
a different shape and used, the area of the part (dome part) that functions as the diaphragm
inside the voice coil becomes smaller and the effective diaphragm area becomes smaller. If it is
desired to obtain the same output sound pressure as that of the unusual speaker, it is necessary
to make the amplitude larger than that, the sound quality is degraded, and the thickness of the
product is impaired.
[0006]
In order to solve the above problems, according to the present invention, in a speaker in which a
circular voice coil is coupled to any one of a rectangular, a track, and an elliptical diaphragm and
used, the inner diameter of the edge portion of the diaphragm is A configuration is provided in
which a pair of reinforcing portions sandwiching the coupling portion to which the coil is
coupled in the major axis direction of the diaphragm is provided.
[0007]
As described above, in the loudspeaker according to the present invention, the connecting
portion in which the circular voice coil is coupled to the inner diameter of the edge portion of
any one of the rectangular, track, and elliptical diaphragms is sandwiched in the major axis
direction of the diaphragm. By providing a pair of reinforcing portions, the reinforcing portion
can also function as a diaphragm to earn an effective diaphragm area, and the same effective
diaphragm area as that of the odd-shaped speaker before rounding the voice coil can be
obtained. There is no need to gain sound pressure by amplitude, the sound quality is not
deteriorated, and the thickness of the speaker is not impaired.
Therefore, there is an effect that sound performance can be secured while realizing small size
(small aperture) and thin profile of the speaker at low cost.
[0008]
Hereinafter, embodiments of the present invention will be described in detail based on the
drawings.
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FIG. 1 shows a vibration system used for a rectangular speaker according to an embodiment of
the present invention, in which (A) is a plan view and (B) is a cross-sectional view taken along line
A-A of (A). FIG. 2 is a plan view of a rectangular speaker according to an embodiment of the
present invention using the vibration system shown in FIG. 1, and FIG. 3 is a sectional view taken
along the line AA of FIG.
[0009]
As shown in FIGS. 1 (A) and 1 (B), the vibration system includes a rectangular diaphragm 1 made
of a resin film such as polyethylene terephthalate (PET) or a metal film such as aluminum, for
example, and a conducting wire spirally. Consists of a circular (round) voice coil 2 formed in a
cylindrical shape, the upper end of the voice coil 2 is fixed to the center on the back surface side
of the diaphragm 1, and the voice coil 2 is on the back surface side from the center of the
diaphragm 1 Hang down.
[0010]
The rectangular diaphragm 1 forms a dome portion 1a having a shape that bulges upward in a
dome shape functioning as a diaphragm at a central portion corresponding to the inner upper
side (the central portion of the diaphragm 1) of the circular voice coil 2. The flat and narrow
annular coupling portion 1b for fixing the upper end of the circular voice coil 2 is formed around
the dome portion 1a, and a dome is formed at the central portion of the inner diameter at the
peripheral portion of the rectangular diaphragm 1 The portion 1a is positioned to form an arcshaped edge portion 1c that bulges upward in a range from the inner diameter to the outer
diameter, and around the edge portion 1c (the outermost peripheral edge of the rectangular
diaphragm 1) A flat, narrow rectangular annular attachment portion 1d for fixing to a frame to
be described later is formed.
[0011]
As shown in FIGS. 2 and 3, the rectangular speaker is configured by assembling the vibration
system shown in FIGS. 1 (A) and 1 (B) and the magnetic circuit 3 for driving the vibration system
in the frame 7.
[0012]
The magnetic circuit 3 comprises a yoke 4, a magnet 5 and a pole piece 6. However, since a
circular voice coil 2 is used, the magnetic circuit 3 is configured in a circular shape (round shape)
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correspondingly, and the circular voice coil 2 can be inserted. Form an annular magnetic gap 3a.
Specifically, a center pole 4a having a hollow cylindrical shape and a circular flange 4b projecting
radially outward from the lower end side of the center pole 4a are integrally formed in a yoke 4
made of a magnetic material, and a magnet The magnet 5 and the pole piece 5 are formed in a
circular ring shape, and further, the pole piece 6 made of a magnetic material is formed in a
circular ring shape, and the magnet 5 is sandwiched between the flange 4b of the yoke 4 and the
pole piece 6 6 is disposed on the outer peripheral side of the center pole 4a with a
predetermined gap, and an annular magnetic gap 3a is formed between the center pole 4a and
the pole piece 6 to form a circular external magnetic circuit 3 ing.
In the magnetic circuit 3, a bottomed cylindrical yoke made of a magnetic material, a disk-shaped
magnet disposed with a predetermined gap between the inner bottom surface of the yoke and
the yoke circumferential side wall, and the magnet A circular, inner-magnet type magnetic circuit
may be used in which a circular pole-shaped magnetic gap is formed between the pole piece and
the circumferential wall of the yoke.
[0013]
The frame 7 is a molded product made of an insulating resin material, but is formed into a
rectangular plate corresponding to the rectangular diaphragm 1, and the center portion of the
frame 7 has a circular shape passing through the front and the back. A through hole 7a is
provided, and the circular magnetic circuit 3 is coupled and held in the central portion of the
frame 7 by fitting the circular magnetic circuit 3 into the through hole 7a from the back surface
side (the back side of the speaker) of the frame 7. ing.
The annular magnetic gap 3 a is open on the front side of the frame 7 (the front side of the
speaker). In addition, a peripheral side wall 1b rising on the surface side of the frame 7 is
integrally formed at the outer peripheral edge of the frame 7, and a vibration system is fitted
inside the peripheral side wall 1b from the surface side of the frame The outermost peripheral
edge of the diaphragm 1 is fixed to the surface side outer peripheral edge of the frame 7 by
fixing the attaching part 1d formed on the outermost peripheral edge of the diaphragm 1 to the
portion via the narrow rectangular annular pad 8. The unit is coupled and held, and a circular
voice coil 2 is suspended and inserted so as to be vertically vertically movable in an annular
magnetic gap 3a.
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[0014]
Contact pieces 9 made of a thin metal plate of good conductivity are integrally provided at each
end of the long diameter side (longitudinal side) of the frame 7 by insert molding, and on the
back side of the frame 7 at each end of the long diameter side. An external connection terminal
10 having a total of two spring characteristics is provided one by one. A portion of each contact
piece 9 is substantially flush exposed on the surface side of the frame 1 and illustrated at two
corners adjacent in the major axis direction of the frame 7 or two corners positioned in the
diagonal direction of the frame 7 The two internal contacts are connected by soldering to the two
internal contacts, and the other part of each contact piece 9 is substantially flush with the back
side of the frame 1 A total of two external contacts 9a are formed at one end of each of the long
diameter sides of the frame 7 exposed to one, and the fixed ends of the external connection
terminals 10 are soldered to the two external contacts 9a. The voice coil 2 and each external
connection terminal 10 are conductively connected. Although a metal coil spring of good
conductivity, which is a separate component from the contact piece 9, is used for the springy
external connection terminal 10, a flat spring integrally extended from the contact piece 9 may
be used.
[0015]
In FIG. 2 and FIG. 3, 11 is a baffle which consists of a metal flat plate with an edge, and in order
to use the rectangular diaphragm 1, it is formed in the rectangle correspondingly. The baffle 11
is mounted on the frame 7 of the vibration system and then fitted from the surface side of the
frame 7 to the inner side of the peripheral side wall 1 b to overlap the edge on the outer
peripheral edge of the rectangular diaphragm 1 The rectangular diaphragm 1 is covered with a
predetermined gap from above to protect it. A front sound hole 11a for emitting sound (air) is
opened on the front side of the speaker at the central portion of the baffle 11 located on the
central surface side of the rectangular diaphragm 1, and the center of the rectangular diaphragm
1 is opened. On the top surface of the center pole 4a located on the rear surface side of the rear
surface, a rear sound hole (exhaust hole) 4c for releasing sound (air) is opened on the rear
surface side (rear surface side of the speaker) of the frame 7.
[0016]
The rectangular speaker according to the present embodiment configured as described above is
provided, for example, in a state in which the free end of each external connection terminal 10 is
electrically connected to a circuit board built in the housing of a mobile phone. It is positioned
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and attached inside the specified sound hole, and is used as a receiver for playing back the
receiving sound, a speaker for playing back music, radio, television, and one-segment
broadcasting voice in addition to ringing tones and ringing tones, and a circuit board When an
electric current is supplied to the circular voice coil 2 from each of the external connection ends
10 and each contact piece 9, the circular voice is generated by the synergy between the magnetic
flux generated by the current flowing in the circular voice coil 2 and the magnetic flux generated
by the magnet 5. The coil 12 vertically vibrates, and the rectangular diaphragm 1 vertically
vibrates accordingly, and the sound (air) escapes from the rear sound hole 4c, and the spear from
the front sound hole 11a Emit sound (air) to the mosquito front side and emitted to the outside
from the housing sound hole.
[0017]
Here, as shown in FIGS. 1 to 3, the inner diameter of the edge portion 1 c of the rectangular
diaphragm 1 integrated with the dome portion 1 a and the edge portion 1 c is such that the
entire circumference is in contact with the outer diameter of the coupling portion 1 b Instead of
being formed in a circular shape, the dome portion 1a is located at the central portion, the inner
edge of the opposite major diameter side (longitudinal side) contacts the coupling portion 1b,
and the inner edge of the opposite minor diameter side (short side) It is formed in the shape
which leaves | separates from the coupling part 1b.
As a result, the portion of the inner diameter of the edge portion 1c of the rectangular diaphragm
1 excluding the dome portion 1a and the coupling portion 1b, that is, the position between the
coupling portion 1b and the edge portion 1c in the major axis direction of the rectangular
diaphragm 1 Then, a pair of empty parts facing each other by sandwiching the coupling part 1b
in the major axis direction of the rectangular diaphragm 1 are additionally formed. Then, the
respective vacant portions are reinforced, and a pair of reinforcing portions 1e which sandwich
the coupling portion 1b in the long diameter direction of the rectangular diaphragm 1 is
additionally provided on the inner diameter of the edge portion 1c of the rectangular diaphragm
1.
[0018]
As described above, since the pair of reinforcing portions 1e sandwiching the coupling portion
1b to which the circular voice coil 2 is coupled in the major axis direction of the diaphragm 1 is
provided at the inner diameter of the edge portion 1c of the rectangular diaphragm The rigidity
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of each reinforcing portion 1e can be enhanced, and each reinforcing portion 1e can function as
a diaphragm in the same manner as the dome portion 1a. As a result, the effective diaphragm
area can be earned by each reinforcing portion 1e, and the same effective diaphragm area as that
of the odd-shaped speaker before voice coil circularization can be obtained. It does not
deteriorate and the thickness of the speaker is not lost. Therefore, it is possible to secure the
acoustic performance while realizing the small size (small diameter) and thin shape of the
speaker at low cost. Since each reinforcing portion 1e is also functioned as a diaphragm in the
same manner as the dome portion 1a, the front sound hole 11a corresponds to the dome portion
1a of the rectangular diaphragm 1 and the surface side of each reinforcing portion 1e. Is formed
on the speaker surface side.
[0019]
In the present embodiment, since the inner diameter of the edge portion 1c of the rectangular
diaphragm 1 is formed in an oval shape, the shape of each vacant portion is crescent-shaped, and
each reinforcing portion 1e is formed by reinforcing each vacant portion. The shape is also
crescent-shaped, but the inside diameter of the edge portion 1c of the rectangular diaphragm 1
may be formed into a rectangle or an ellipse instead of an oval.
[0020]
In addition, each vacant portion is a crescent moon shape having the same shape as each vacant
portion in which each vacant portion is expanded upward as a mountain shape in which the
cross-section (A-A cross section) shape becomes “shaped”. 4 (A) and 4 (B), radiation is
generated between the outer periphery of the connecting portion 1b and the inner periphery of
the edge portion 1c, as shown in FIGS. Each vacant portion may be reinforced with a plurality of
narrow reinforcing ribs 1g extending in the direction to form each reinforcing portion 1e, as
shown in FIGS. 5A and 5B, corresponding to each vacant portion. The free space may be
reinforced by pasting the vibrating plate 1h having a shape on the front side or the back side of
the free space 1 to form each reinforcing portion 1e.
In FIG. 5A, the shaded portion is the vibrating plate 1h.
[0021]
Furthermore, in the present embodiment, as shown in FIGS. 1A, 4A, and 5A, both end portions in
the major diameter direction (long direction) of the edge portion 1c of the rectangular diaphragm
1 A plurality of linear reinforcing ribs 1j are provided at narrow intervals in the substantially
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radial direction between the inner diameter and the outer diameter of the edge portion 1c in the
side region in which the rigidity of the rectangular diaphragm 1 in the long diameter direction is
enhanced. The non-uniform compliance is ensured, and the dome portion 1a and the pair of
reinforcing portions 1e can perform vertical vibration more reliably integrally with the circular
voice coil 2.
[0022]
In the present embodiment, the rectangular voice coil 2 is coupled to the rectangular diaphragm
1 and applied to the rectangular speaker used, but the present invention is not limited to the
rectangular speaker, and a track shape (long A circular voice coil can be combined with a circular
or elliptical diaphragm, and it can be applied to a track-shaped or elliptical speaker used.
This track-shaped (elliptical) or elliptical speaker has the same structure except that the shapes
of the frame and the baffle corresponding to the shapes of the rectangular speaker and the
diaphragm of the present embodiment described above are different. Therefore, detailed
description and illustration of these track-shaped (elliptical) and elliptical speakers are omitted.
[0023]
The vibration system used for the rectangular speaker concerning one embodiment of this
invention is shown, (A) is a top view, (B) is the sectional view on the AA line of (A). FIG. 3 is a plan
view of a rectangular speaker according to an embodiment of the present invention using the
vibration system shown in FIG. FIG. 3 is a cross-sectional view taken along the line AA of FIG. The
reinforcement means of the vacant part in the diaphragm of FIG.1 (A) (B) is shown, (A) is a top
view, (B) is the sectional view on the AA line of (A). The further reinforcement means of the
vacant part in the diaphragm of FIG.1 (A) (B) is shown, (A) is a top view, (B) is the sectional view
on the AA line of (A).
Explanation of sign
[0024]
Reference Signs List 1 diaphragm 1a dome portion 1b joint portion 1c edge portion 1e
reinforcing portion 1f reinforcing rib 1g reinforcing rib 1h vibrating plate 1h 2 voice coil
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