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DESCRIPTION JP2012239055

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DESCRIPTION JP2012239055
PROBLEM TO BE SOLVED: To provide a full drive speaker capable of generating a practical
sound pressure level while preventing deterioration of sound quality and having a large degree of
freedom in design of a front shape. SOLUTION: In a full drive speaker, first and second magnetic
circuits in which magnetic circuits MC1 and MC2 having cylindrical magnetic gaps are arranged
at equal intervals in the longitudinal and transverse directions, respectively, and the magnetic
gaps are closely disposed to face each other. And a diaphragm 21 disposed on a neutral surface
between the magnetic circuit groups and provided with a voice coil VC. The magnetic circuits
MC1 and MC2 of each of the first and second magnetic circuit groups are arranged to be
opposed to each other while being shifted by 1/2 pitch in the vertical and horizontal directions.
In the voice coil VC, the arcs of the outer circumferences of the fan-shaped regions
corresponding to adjacent 90 degrees or 180 degrees of the closely opposed magnetic gaps in
the first and second magnetic circuit groups are not crossed. It is formed along the line which
connects continuously with one stroke. [Selected figure] Figure 1
Fully driven speaker
[0001]
TECHNICAL FIELD The present invention relates to a thin and small-sized full-drive speaker in
order to be incorporated in a thin and small device.
[0002]
In recent years, with the reduction in thickness and size of electric and electronic devices such as
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1
small flat-screen TVs, for example, the speakers built in these devices are required to be thinner.
In addition, sound reproduction at a practical sound pressure level is possible, and the front
shape of the speaker is also required to have a high degree of freedom in design so as to
correspond to various shapes according to the installation place.
[0003]
In general, a flat type is suitable for thinning the speaker, and in the case of focusing on acoustic
characteristics in the flat type, it is considered that a full drive type speaker is preferable.
However, although there are various types and configurations of flat type and full drive type
speakers, those satisfying the above requirements have not been developed yet.
[0004]
Therefore, in the patent document 1, the present applicant arranges two or more magnetic
circuits having cylindrical magnetic gaps in a plane, connects the upper surfaces of the magnetic
gaps with a single non-crossing line, and has one writing start and one writing end. We proposed
a "full drive speaker" that uses a voice coil of a pattern designed to come to a magnetic circuit.
[0005]
With this configuration, the speaker can be formed with the total height of one small magnetic
circuit, and the effective linear density of the voice coil can be efficiently increased in a limited
front area by the shape of connection of the plurality of magnetic circuits and the ring. It was
possible to realize a thin speaker.
[0006]
JP, 2010-245601, A
[0007]
By the way, in the "full surface drive speaker" of Patent Document 1, in order to realize a thin
speaker unit of 3 mm or less, the magnetic circuit group is made to face the voice coil only on
one side of the diaphragm.
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For this reason, the magnetic flux loop to be used is a leakage loop connecting the outer
circumference of the short cylindrical magnet for forming the cylindrical magnetic gap and the
inner circumference of the recess of the yoke.
[0008]
For this reason, since the magnetic flux density varies depending on the location and there are
few spatially uniform magnetic flux density portions, distortion may occur at high amplitude
vibrations.
Therefore, although it is effective when priority is given to thinness or as a high-pitched speaker
having a relatively small amplitude, it is desirable to improve the sound quality in a high-pitched
bass region.
[0009]
The present invention has been proposed in view of the above, and an object of the present
invention is to generate a practical sound pressure level while preventing deterioration in sound
quality, and to provide a full-drive speaker with a large degree of freedom in front shape design.
To provide.
[0010]
In order to solve the above problems, in the full drive speaker of the present invention according
to claim 1, magnetic circuits MC1 and MC2 having cylindrical magnetic gaps MG1 and MG2 are
arranged at equal intervals in the longitudinal and transverse directions, respectively. The first
and second magnetic circuit groups 11 and 12 in which the MG1 and MG2 are disposed in close
proximity to each other, and the neutral surface of the facing space of the first and second
magnetic circuit groups 11 and 12 The vibration plate 21 and the voice coil VC provided on the
vibration plate 21 are provided, and the first and second magnetic circuit groups 11 and 12 have
half pitches of the magnetic circuits MC1 and MC2 in the vertical and horizontal directions. The
voice coils VC are disposed so as to be shifted and opposed to each other, and correspond to
adjacent 90 degrees or 180 degrees of the magnetic gaps MG1 and MG2 closely disposed
opposite to each other in the first and second magnetic circuit groups 11 and 12 The The arc of
the outer periphery of the fan-shaped area, characterized by continuously be formed along the
line connecting in a single stroke without crossover.
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[0011]
According to a second aspect of the present invention, in the full drive speaker according to the
first aspect, when the radius to the central portions AX1 and AX2 of the magnetic gaps MG1 and
MG2 is R, the vertical and horizontal distance ΔL between the magnetic circuits MC1 and MC2
Are respectively characterized by 2.4R to 3.2R.
[0012]
The invention according to claim 3 is characterized in that, in the full drive speaker according to
claim 2, a fan-shaped region corresponding to 180 degrees of the magnetic gaps MG1, MG2 is a
corner portion of the voice coil VC. .
[0013]
The invention according to claim 4 relates to the full drive speaker according to claim 1, wherein
the polarity of the magnetic circuit MC1 on the lower surface of the first magnetic circuit group
11 and the polarity on the upper surface of the second magnetic circuit group 12 It is
characterized in that the polarity of the magnetic circuit MC2 is different.
[0014]
The invention according to claim 5 is the full-field drive type speaker according to claim 1,
wherein adjacent to the magnetic circuits MC1 and MC2, a magnetic position at which the
second and first magnetic circuit groups 12 and 11 are opposed to each other. The circuit further
includes openings 20 and 16 provided corresponding to the circuits MC2 and MC1 and emitting
sound pressure generated by the vibration of the diaphragm 21 to the space on the opposite side
of the magnetic circuits MC1 and MC2. Do.
[0015]
According to the present invention according to claims 1 to 5, since the magnetic flux loop is not
the leakage loop of the magnetic circuit but the main loop, it is possible to form a uniform space
of magnetic flux widely.
In addition, the magnetic flux density can be increased by arranging the two magnetic circuit
groups opposite to each other.
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Thereby, a speaker with higher sensitivity can be realized in a wide amplitude range.
[0016]
In addition, each portion of the voice coil is continuously below the first magnetic circuit group
or directly above the second magnetic circuit group except for the end, and intersects the
magnetic flux over substantially the entire length.
As a result, a large number of radial flux loops are formed on the neutral surfaces of the two
magnetic circuit groups.
Furthermore, the circumferential portion of the magnetic gap in the voice coil is orthogonal to
the magnetic flux radially formed in the magnetic gap, and when energized, a driving force in the
vertical direction is efficiently generated in the neutral surface of the voice coil.
[0017]
In addition, by arranging the magnetic circuits at intervals of 1/2 pitch in the vertical and
horizontal directions, if the diameter of the magnet is DM, a large opening of about 0.8 × DM
can be provided, and the effect of improving the sound quality is large. .
[0018]
Therefore, it is possible to generate a practical sound pressure level while preventing
deterioration of the sound quality, and to provide a full drive speaker having a large degree of
freedom in design of the front shape.
[0019]
This is for explaining the basic structure of a full drive speaker according to an embodiment of
the present invention, wherein (a) is a plan view of two magnetic circuit groups and a voice coil,
and (b) is an A of the (a) diagram. -A 'arrow sectional drawing.
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The side of the first magnetic circuit group in FIG. 1 is shown, where (a) is a plan view and (b) is a
cross-sectional view taken along line A-A 'in (a).
The side of the second magnetic circuit group in FIG. 1 is shown, (a) is a plan view, and (b) is a
cross-sectional view taken along the line A-A 'in (a).
The diaphragm and voice coil in FIG. 1 are extracted and shown, (a) drawing is a top view, (b)
drawing is a sectional view taken along the line A-A 'in (a) drawing.
It is sectional drawing which expands and shows a part of FIG.1 (b).
It is for explaining the consideration when setting the interval of each magnetic circuit, (a) Figure
shows "ΔL = 2Δ2 · R", (b) Figure shows "ΔL <2√ 2 · R" Is a diagram showing the case of. This
figure is for explaining the consideration when setting the intervals of each magnetic circuit, and
(a) shows the case of “ΔL> 2√2 · R” in the case of (b) considering the thickness of the yoke.
FIG.
[0020]
In the prior application (Japanese Patent Application No. 2010-120271), the present applicant
improves the sound quality and the sensitivity by arranging the first and second magnetic circuit
groups symmetrically arranged with the magnetic gap faces facing each other. "Thin type full
drive speaker" was proposed.
[0021]
The present invention is a further improvement by combining the technique described in Patent
Document 1 described above and the technique described in the above-mentioned prior
application.
That is, the sound quality is improved in the low-pitch range where the amplitude is large by
performing the following (A) to (C).
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[0022]
(A) In Patent Document 1, the magnetic flux loop to be used is a leakage loop, and the main loop
is made as in the case of the prior application, thereby increasing the magnetic flux density and
widening the area that can be regarded as uniform.
[0023]
(B) In the configuration of the repulsion type magnetic circuit in which the same pole of the
magnet is made to face as in the previous application, if the arrangement density of the magnetic
circuit is increased to increase the crossover between the current of the coil and the magnetic
flux, The area covered by the circuit increases and the direct radiation area of sound decreases.
Therefore, the two magnetic circuit groups are opposed to each other while being shifted by 1/2
pitch in the vertical and horizontal directions, and the polarities of the opposing magnetic circuits
in the two magnetic circuit groups are changed.
[0024]
(C) In the configuration of the prior application, sound radiation is performed through an
opening provided between adjacent magnetic circuits and a hole provided at the center of the
magnetic circuit. Minimizing the formation of a structural acoustic circuit around the diaphragm
is necessary to prevent deterioration of the sound quality, but in this case it is important to make
the diameter of the opening and the hole as large as possible. In the configuration of the prior
application, in order to provide an opening (hole) in the gap between the adjacent magnetic
circuits, the diameter of the opening is limited to about 0.3 × DM, where DM is the diameter of
the magnet. However, a larger opening (through hole) of about 0.8 × DM can be provided by
arranging the two magnetic circuit groups so as to be offset by 1⁄2 pitch in the vertical and
horizontal directions as described above.
[0025]
Based on the above considerations (A) to (C), in the embodiment of the present invention, the full
drive speaker is configured as the following (1) to (4).
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[0026]
(1) Two magnetic circuit groups in which cylindrical magnetic gaps are arranged at equal
intervals in the longitudinal and transverse directions, respectively, are formed, and the surfaces
of the magnetic gaps of these two magnetic circuit groups are closely arranged to face each
other.
[0027]
(2) When the radius to the central part of the magnetic gap is R, the two magnetic circuit groups
are equally spaced so that the magnetic circuit has vertical and horizontal intervals (ΔL) of 2.4 R
to 3.2 R, respectively. Arrange by.
Then, these two magnetic circuit groups are arranged to be opposed to each other while being
shifted by 1/2 pitch in the vertical and horizontal directions.
Here, the polarities of the opposing magnetic circuits in the two magnetic circuit groups are
different.
[0028]
(3) A voice coil is disposed on the neutral surface of the opposing space of the above two
magnetic circuit groups. This voice coil is a single-stroke writing continuously without crossing
the arcs of the outer periphery of a fan-shaped area corresponding to adjacent 90 degrees or
180 degrees of the closely opposed magnetic gaps in the two magnetic circuit groups. Form
along the connecting line.
[0029]
(4) An opening (a through hole) is provided on the facing surface of each magnetic circuit in the
two magnetic circuit groups.
[0030]
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According to the above configuration, a large number of radial magnetic flux loops are formed on
the neutral surfaces of the two magnetic circuit groups.
This flux loop is not the leakage loop of the magnetic circuit but the main loop. Further, the voice
coil in the circumferential direction of the magnetic gap is orthogonal to the magnetic flux
radially formed in the magnetic gap, and when energized, a driving force in the vertical direction
is efficiently generated in the neutral surface of the voice coil. Furthermore, sound pressure
generated by the vibration of the diaphragm can be effectively radiated from the opening to the
space on the opposite side of the magnetic circuit.
[0031]
As a result, it is possible to generate a practical sound pressure level while preventing the
deterioration of the sound quality, and to increase the design freedom of the front shape.
[0032]
Hereinafter, an embodiment of the present invention will be described based on the drawings.
[0033]
FIG. 1 is for explaining the basic structure of a full drive speaker according to an embodiment of
the present invention, wherein (a) is a plan view of two magnetic circuit groups and a voice coil,
and (b) is a (a) FIG. 7 is a cross-sectional view taken along the line AA 'of FIG.
2 to 4 show the first and second magnetic circuit groups, the diaphragm and the voice coil in FIG.
1, respectively, and (a) shows a plan view and (b) shows ( a) It is the AA 'line arrow sectional
drawing of a figure.
[0034]
As shown in FIGS. 2A and 2B, in the first magnetic circuit group 11, magnetic circuits of m rows
and n columns, in this example, circular magnetic circuits MC1 of 4 rows and 4 columns are
arranged in a matrix. ing.
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Assuming that the radius to the central portion AX1 of the cylindrical magnetic gap MG1 is R, the
magnetic circuits MC1 are equally spaced (ΔL pitch) so that the magnetic circuit MC1 has a
square of 2.4R to 3.2R. It is arranged in order.
[0035]
In each magnetic circuit MC1 of the first magnetic circuit group 11, a cylindrical yoke 14 with a
bottom is fitted in a recess 13a provided at the bottom of the housing 13. Inside the yoke 14, the
inner diameter of the yoke 14 is provided. A short cylindrical magnet 15 smaller than the above
is accommodated and formed. Thus, a cylindrical magnetic gap MG1 is formed between the inner
surface of the yoke 14 and the outer periphery of the magnet 15. Furthermore, openings
(through holes) 16 are formed in the housing 13 between the magnetic circuits MC1 at positions
corresponding to the magnetic circuits MC2 of the second magnetic circuit group 12.
[0036]
As shown in FIGS. 3 (a) and 3 (b), the second magnetic circuit group 12 also has the same
configuration as the first magnetic circuit group 11, and in this example, a circular magnetic
circuit of 3 rows and 3 columns. MC2s are arranged at equal intervals in the vertical and
horizontal directions. As in the first magnetic circuit group 11, assuming that the radius to the
central portion AX2 of the cylindrical magnetic gap MG2 is R, the magnetic circuits MC2 are 2.4
R to 3.2 R They are arranged at equal intervals (ΔL pitch) so as to be square.
[0037]
In each magnetic circuit MC2 of the second magnetic circuit group 12, a cylindrical yoke 18 with
a bottom is fitted in a recess 17a provided at the bottom of the housing 17. Inside the yoke 18,
the inner diameter of the yoke 18 is provided. A short cylindrical magnet 19 smaller than the
above is accommodated and formed. Thus, a cylindrical magnetic gap MG2 is formed between
the inner surface of the yoke 18 and the outer periphery of the magnet 19. Further, an opening
(through hole) 20 is formed at a position facing the magnetic circuit MC1 of each of the first
magnetic circuit group 11 of the housing 17.
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[0038]
Then, as shown in FIGS. 1 (a) and 1 (b), the first and second magnetic circuit groups 11 shown in
FIGS. 2 (a) and 2 (b) and FIGS. 3 (a) and 3 (b), respectively. 12, the surfaces of the magnetic gaps
MG1 and MG2 are disposed close to and facing each other. At this time, the magnetic circuits
MC1 and MC2 are respectively shifted by 1⁄2 pitch (ΔL / 2) in the vertical and horizontal
directions, in other words, they are shifted by a half cycle. As a result, the central portion AX1 of
the magnetic gap MG1 of the magnetic circuit MC1 and the central portion AX2 of the magnetic
gap MG2 of the magnetic circuit MC2 are disposed opposite to each other in a state where they
coincide with each other.
[0039]
Here, the lower surface of the magnetic circuit MC1 is an S pole, and the upper surface of the
magnetic circuit MC2 is an N pole. The polarities of the magnetic circuits MC1 and MC2 may be
different, and the lower surface of the magnetic circuit MC1 may be an N pole and the upper
surface of the magnetic circuit MC2 may be an S pole.
[0040]
On the neutral surface between the magnetic circuits MC1 and MC2, a voice coil (flexible coil) VC
is stretched between the side plates 13b and 13c at the end of the casing 13. The voice coil VC is
formed on a thin film (or in the thin film) which works as the diaphragm 21 as shown in FIGS. 4
(a) and 4 (b). Then, an arc of an outer periphery of a fan-shaped area corresponding to adjacent
90 degrees (180 degrees at a corner portion) of the magnetic gaps MG1 and MG2 closely
disposed opposite to each other in the first and second magnetic circuit groups 11 and 12 In the
form of a pattern along a line connecting continuously with one stroke without crossing.
[0041]
Therefore, as shown in an enlarged manner in FIG. 5 (b) of FIG. 1 (b) the region SE surrounded by
a broken line, the magnetic circuit MC1, MC2 in the same forward direction (not the repulsion
direction) Radial flux loops are formed. Further, since this magnetic flux loop is also a main loop
in which the N pole and the S pole face each other, the magnetic flux density is large and the area
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11
that can be regarded as uniform is wide.
[0042]
Moreover, each of the circular portions of the voice coil VC held by the diaphragm 21 disposed in
the neutral plane is disposed in the radial main magnetic flux loop, and when the voice coil VC is
energized, the coils are neutral. The driving force in the direction perpendicular to the surface
and the diaphragm 21 is efficiently generated.
[0043]
The central axes AX3 and AX4 of the openings 16 and 20 formed in the housings 13 and 17 are
arranged to coincide with the central axes AX5 and AX6 of the magnets 15 and 19 of the
magnetic circuits MC1 and MC2 disposed opposite to each other. Ru.
As described above, since the magnetic circuits MC1 and MC2 are alternately arranged at the
upper and lower sides, the openings 16 and 20 can be efficiently arranged using the gaps
between the magnetic circuit paths MC1 and MC2. Assuming that the diameter of 19 is DM, a
large opening of about 0.8 × DM can be provided.
[0044]
Therefore, the diaphragm 21 vibrates by the driving force when the voice coil VC is energized,
and the sound pressure generated by the vibration is effectively applied to the space outside the
housings 13 and 17 through the openings 16 and 20. It is emitted and is effective in improving
the sound quality.
[0045]
The interval ΔL between the magnetic circuits MC1 and MC2 is set based on the following
consideration.
The interval of the magnetic circuit MC1 when the positive circle in the gap of the magnetic
circuit MC1 (the circle at the center of the gap) and the positive circle in the gap of the magnetic
circuit MC2 contact at four points (X1 to X4) as shown in FIG. ΔL is “√2 × 2R”. Therefore,
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ΔL = 2√2 · R (about 2.83 R).
[0046]
Further, when “ΔL <2√2 · R”, as shown in FIG. 6B, the intersection points Y of the middle
round circles of the upper and lower magnetic circuits MC1 and MC2 become eight places (Y1 to
Y8), and the circumferential direction The uniformity of the magnetic flux density B at the point
is increased, which is advantageous in terms of driving force (Bil). Here, the driving force (Bil) is
an electromagnetic force F (F = Bil, B: magnetic flux density, i: current, l: effective length of the
coil) generated by Fleming's law by passing a current through the drive coil. is there.
[0047]
However, since the thickness of the yoke 14 is present, the actually obtainable minimum value is
about 2.4R. For example, as shown in FIG. 7A, assuming that the outer diameter φ1 of the yoke
14 is 14 mm, the inner diameter φ2 is 12 mm, and the diameter φ3 of the magnet 15 is 10 mm,
the distance ΔL between adjacent magnetic circuits MC1 is “ΔL = 14 mm = about 2.55R ".
[0048]
On the other hand, when “ΔL> 2√2 · R”, the magnetic flux density B decreases. That is, as
shown in FIG. 7B, the interference of the magnetic field between the magnetic circuits MC1 and
MC2 is reduced, and the leakage magnetic field of a single magnetic circuit is approached. Then,
when ΔL exceeds about 3.2 R, the leakage magnetic field becomes dominant. Therefore, the
preferable interval ΔL between the magnetic circuits MC1 and MC2 is in the range of 2.4R to
3.2R.
[0049]
According to the above configuration, since the magnetic flux loop to be used is the main
magnetic flux loop as described above, it is possible to form a uniform space of magnetic flux
widely. In addition, the magnetic flux density can be increased by the facing arrangement of the
magnetic circuit groups. Moreover, as shown in FIG. 1A, each portion of the voice coil is
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13
continuously located immediately above or below the magnetic gap except for the end, and
intersects the magnetic flux over substantially the entire length. This makes it possible to widen
the space of uniform magnetic flux density, and the magnetic flux density is also high due to the
configuration of the opposing magnetic circuit. Therefore, a speaker with a wide amplitude range
and higher sensitivity can be realized.
[0050]
Furthermore, unlike the magnetic circuit group configured in the repulsion direction as in Patent
Document 1, it is possible to magnetize after assembling the speaker, and the assembly
(manufacturing process) can be simplified.
[0051]
Therefore, while preventing deterioration of the sound quality, a practical sound pressure level
can be generated while being as thin as several millimeters, and the front shape has a large
degree of freedom in design, in other words, the shape design according to the installation
location An easy-to-use full-drive speaker can be provided.
[0052]
Although the thickness of the speaker is approximately twice that of the configuration of Patent
Document 1 by arranging the two groups of magnetic circuits in an opposing manner, it is still
possible to be 10 mm or less in the case of a small magnetic circuit, and other methods It is still
thin enough compared to.
[0053]
Further, in the above embodiment, an example in which the first magnetic circuit group 11 is the
magnetic circuit MC1 of 4 rows and 4 columns and the second magnetic circuit group 12 is the
magnetic circuit MC2 of 3 rows and 3 columns is arranged in a square respectively did.
However, the first magnetic circuit group 11 is formed of magnetic circuits MC1 of m rows and n
columns (where m and n are integers of 2 or more), and the second magnetic circuit group 12 is
(m-1) rows (n -1) It may be formed by the magnetic circuit MC2 of the row, and may of course be
arranged in various shapes other than the square.
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[0054]
Although the present invention has been described using the embodiment and the examples, the
present invention is not limited to the above embodiment and the examples, and various
modifications may be made without departing from the scope of the invention in the
implementation stage. It is possible.
The above-described embodiment and examples include inventions at various stages, and various
inventions can be extracted by appropriate combinations of a plurality of disclosed constituent
elements.
For example, even if some of the configuration requirements are deleted from all the
configuration requirements shown in the embodiment and the example, at least one of the
problems described in the section of the problem to be solved by the invention can be solved. If
at least one of the effects described in above can be obtained, a configuration from which this
configuration requirement is deleted can be extracted as the invention.
[0055]
11 first magnetic circuit group 12 second magnetic circuit group 13, 17 casing 13a, 17a recess
13b, 13c side plate 14, 18 yoke 15, 19 magnet 16, 20 opening 21 diaphragm MG1, MG2
magnetic gap MC1, MC2 magnetic circuit ΔL interval VC voice coil AX1, AX2 central part AX3
to AX6 central axis
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