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JP2008109222

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2008109222
An object of the present invention is to miniaturize an input impedance switch 30 of a speaker
20 and secure a place for installing a fuse. A switch (30) includes a speaker side terminal row
(42), an amplifier side terminal row (43) and a mounting portion row (46). The terminals VC1 ±
and VC2 ± of the terminal array 42 are connected to both ends of the voice coils VC1 and VC2.
The terminals A1 ± and A2 ± of the terminal row 43 are connected by switching the output line
of the audio amplifier AMP in accordance with the bi-amplifier connection, the series connection,
or the parallel connection. The mounting portion array 46 includes a single row of mounting
portions 47 to 50 in the lateral direction of the fuse 32. The bi-amplifier connection is achieved
by mounting the fuse 32 to the mounting portions 47 and 50, and the series connection is
achieved by mounting the fuses 32 to the mounting portions 49 and 50 (however, the fuse 32 of
the mounting portion 50 is in a non-current state) The wires 54 connect the terminals of the
terminal rows 43 and 44 and the mounting portion array 46 so that parallel connection is
achieved by mounting the fuses 32 to the mounting portions 47 and 48. [Selected figure] Figure
5
Speaker input impedance switching device
[0001]
The present invention relates to a switching device for the input impedance of a speaker
equipped with two voice coils, and more particularly to a switching device capable of switching
the input impedance of the speaker by changing the mounting location of a connecting
conductor such as a fuse.
[0002]
09-05-2019
1
In Patent Document 1, jumper wires or fuses (hereinafter, “jumper wires” and “fuses” are
collectively referred to as “connection conductors” without changing the connection of each of
the two voice coils of the speaker to the respective ± terminals.
And a speaker input impedance switching device capable of appropriately switching the input
impedance of the speaker by attaching and detaching. That is, a groove (channel 26 of FIG. 4B of
Patent Document 1) in which a connection conductor of unit length (L of FIG. 8 and FIG. 9 of
Patent Document 1) can be detachably attached is formed, and two voice coils are bi-amplifier
connected In the case of using in, as shown in FIG. 5 of Patent Document 1, the connecting
conductor is removed, and when using two voice coils in series connection, it is shown in FIG. 6
of Patent Document 1 Thus, one connecting conductor (36 in FIG. 6 of Patent Document 1) is
attached between C2- and C1 + at the longitudinal center of the groove, and two voice coils are
used in parallel connection. In this case, as shown in FIG. 7 of Patent Document 1, two
connecting conductors (symbol 36 of FIG. 7 of Patent Document 1) are placed between C1- and
C2- on the left end side in the groove longitudinal direction, Attach between C1 + and C2 + on the
right end side. US Patent Application Publication 2004/196987
[0003]
The problems with the speaker input impedance switching device of Patent Document 1 are as
follows.
[0004]
(A) A groove is a conductor bar which mutually connects the amplifier side terminals A1-, A2-, A1
+, A2 + and the coil side terminals C1-, C2-, C1 +, C2 + (symbol 20 in FIG. 4 of Patent Document
1) The conductor bars need to extend in the width direction of the conductor, and as a result, the
spacing between adjacent conductor bars must be secured by the length of one connecting
conductor, and the grooves are extended in the longitudinal direction of the conductor bars. The
length in the row direction and the length of the groove of the row increase, which hinders the
miniaturization of the speaker input impedance switching device.
[0005]
(B) When using a voice coil in a bi-amp (BI-AMP) connection, it is difficult to replace the
connecting conductor in the groove with a fuse because it is necessary to remove all the
connecting conductors from the groove. The fuse for preventing over current needs to be
secured separately from the groove, which is disadvantageous.
09-05-2019
2
[0006]
(C) In each of the bi-amplifier connection, series connection and parallel connection, the number
of connection conductors attached to the groove is different, and the connection conductor not
used needs to be stored in another place by the user, and storage of the connection conductor is
complicated In addition, the connection conductor is easily lost.
[0007]
(D) In order to prevent erroneous attachment of the connection conductor, if covering is applied
to the groove portion that prevents installation, in the case of bi-amplifier connection, one long
covering covering the entire groove, in the case of series connection In the case of parallel
connection, it is necessary to leave one cover at each of the left and right ends of the groove, and
in the case of parallel connection, the number of covers increases, and storage of unused covers
It becomes cumbersome and it is easy to lose the cover.
[0008]
An object of the present invention is to provide a speaker input impedance switching device
which can overcome the above-mentioned problems.
[0009]
In the speaker input impedance switching device of the present invention, the mounting portions
for mounting the connection conductors are arranged in a row in the short direction of the
connection conductors.
In addition, all the terminals of the mounting row are separated from each other without
overlapping each other, and the wiring circuit is a bi-amp connection, a series connection, and a
parallel connection of voice coils, each connecting one or more connection conductors The
terminal of the row of the mounting portion, the speaker side terminal and the amplifier side
terminal are connected so as to be switched by mounting to the mounting portion corresponding
to.
[0010]
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3
That is, the speaker input impedance switching device of the present invention has the following.
A plurality of speaker side terminals respectively connected to respective terminals of two voice
coils of a speaker, a plurality of amplifier sides to which respective output lines of an audio
amplifier are connected according to bi-amp connection, series connection and parallel
connection of voice coils A mounting portion row in which the mounting portions are detachable
from each other, and all the terminals of all the mounting portions are separated from each
other, and the mounting portions are arranged in a row in the lateral direction of the connection
conductors; The terminals of the mounting row, the speaker-side terminal and the amplifier-side
terminal are switched so that the bi-amp connection, series connection and parallel connection of
the voice coil is switched by mounting one or more connection conductors to the mounting parts
corresponding to each connection. Wiring circuit connecting between
[0011]
According to the present invention, the mounting portions for mounting the connection
conductor are arranged in a row in the lateral direction of the connection conductor, so that the
space of the mounting portion array is reduced, and further, the speaker input impedance
switching device is miniaturized. It is possible.
Also, the wiring circuit of the speaker input impedance switching device is switched such that the
bi-amp connection, series connection and parallel connection of the voice coil are switched by
attaching one or more connection conductors to the mounting portions corresponding to each
connection. Since the terminals of the mounting row, the speaker side terminal and the amplifier
side terminal are connected, when a fuse is adopted as a connection conductor, mounting is
performed for all of the voice coil bi-amplifier connection, series connection and parallel
connection. A row can be used as a fuse installation place.
That is, it is possible to omit the trouble of securing the fuse installation place at a place different
from the mounting part row.
[0012]
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4
FIG. 1 is a schematic perspective view of the bobbin 10.
The voice coil VC1 and the voice coil VC2 are wound around the side surface of the bobbin 10 at
axially spaced portions of the bobbin 10.
The lead wires 14 and 15 extend from the winding portion of the voice coil VC1 in the axial
direction of the bobbin 10 and reach the top surface 11 of the bobbin 10. The lead wires 17 and
18 extend from the winding portion of the voice coil VC2 in the axial direction of the bobbin 10
and reach the top surface 11 of the bobbin 10.
[0013]
FIG. 2 is a schematic cross-sectional view of the speaker 20 including the bobbin 10. The speaker
cone 27 is coaxially arranged with respect to the speaker basket 24 and has its large diameter
peripheral portion raised slightly forward from the front opening of the speaker basket 24 while
the peripheral portion of the front portion of the speaker basket 24 And the small diameter end
is advanced to a sufficient depth in the speaker basket 24.
[0014]
The bobbin 10 has its front end peripheral edge fitted and fixed to the small diameter end of the
speaker cone 27 and is displaced in the axial direction of the speaker 20 integrally with the small
diameter end. The cylindrical magnet 25 is fixed to the end face on the inner surface side of the
speaker basket 24 at the rear surface side, and the rear end portion of the bobbin 10 is inserted
inwardly from the front end opening side so that relative displacement is possible.
[0015]
The input impedance switching device 30 is disposed on the outer surface side of the speaker
basket 24, and the ends of the lead wires 14, 15, 17 and 18 are connected to C1 +, C1-, C2 + and
C2- respectively. A1 +, A1-, A2 +, and A2- of the input impedance switching device 30 are
connected so as to be able to disconnect the cables from the audio amplifiers AMP1 and 2 (FIGS.
7 to 9).
09-05-2019
5
[0016]
FIG. 3 is a perspective view of the fuse 32. As shown in FIG. The fuse 32 is removably attached to
the input impedance switching device 30. The fuse 32 has a fuse body 33 and two legs 34
projecting from both ends of the fuse body 33 in the longitudinal direction. The legs 34 act as
terminals of the fuse 32. L and S are the dimensions in the longitudinal direction and the lateral
direction of the fuse body 33, respectively.
[0017]
FIG. 4 is a perspective view of the jumper wire 36. The jumper wire 36 is attached to the input
impedance switch 30, and in this example is cylindrical. L and S are dimensions in the
longitudinal direction and the short direction of the jumper wire 36, respectively. The lengths of
L and S of the fuse body 33 and the lengths of L and S of the jumper wire 36 are the same.
[0018]
That is, the fuse 32 of FIG. 3 can be attached to the input impedance switching device 30, and
the jumper wire 36 of FIG. 4 can be attached instead of the fuse 32. When the fuse 32 of FIG. 3 is
attached, the fuse 32 is a measure against over current of the voice coils VC1 and VC2.
[0019]
FIG. 5 is a view showing the inner and outer wiring states in the input impedance switching
device 30. The input impedance switching device 30 has a printed circuit board 41, and the
speaker side terminal row 42 and the amplifier side terminal row 43 are disposed on the speaker
side of the printed circuit board 41 and the side edge portion on the non-speaker side. The
speaker side terminal row 42 includes four terminals VC1 +, VC1−, VC2 +, VC2− arranged in a
line at equal intervals along the side edge of the printed circuit board 41. The terminals VC1 +,
VC1-, VC2 +, VC2- of the speaker-side terminal array 42 are connected to the ends of lead wires
14, 15, 17, 18 from the voice coils VC1, VC2 of the speaker 20, respectively.
09-05-2019
6
[0020]
The amplifier-side terminal array 43 includes four terminals A1 +, A1-, A2 +, and A2- arranged in
a line at equal intervals along the side edge of the printed circuit board 41. Cables from the audio
amplifiers AMP 1 and 2 (FIGS. 7 to 9) are detachably connected to the terminals A1 +, A1−, A2 +
and A2− of the amplifier-side terminal array 43.
[0021]
The mounting portion row 46 is disposed at an intermediate portion between the speaker side
terminal row 42 and the amplifier side terminal row 43, and includes four mounting portions 47,
48, 49, and 50. The mounting portions 47, 48, 49, 50 are arranged in a row in parallel in the row
direction of the speaker side terminal row 42 and the amplifier side terminal row 43. The
mounting portions 47, 48, 49, 50 respectively include a pair of terminals 47a, 47b, a pair of
terminals 48a, 48b, a pair of terminals 49a, 49b, and a pair of terminals 50a, 50b. The mounting
portions 47, 48, 49, 50 of the mounting portion row 46 are arranged in a row in the short
direction of the fuses 32 etc. mounted thereto.
[0022]
In order to fit the mounting of the fuses 32 in the mounting row 46, each terminal of the
mounting row 46 has a socket structure in which the plate-like legs 34 of the fuse 32 can be
inserted and removed. Further, in order to fit the mounting of the jumper wire 36, the terminals
of each pair of the mounting row 46 have a socket structure for receiving and elastically
clamping the end portion of the cylindrical jumper wire 36 inside. Ru.
[0023]
The wiring 54 is formed of a film formed by metal deposition on the printed circuit board 41,
and the terminals VC1 +, VC1−, VC2 +, VC2−, VC1−, A1 +, A1−, A2 +, A2−, 47a, 47b, 48a,
48b, 49a , 49b, 50a, 50b are given predetermined connection relations. The connection
relationship by the wiring 54 will be described in detail.
09-05-2019
7
[0024]
The terminal A1 + is connected to the terminals VC1 +, 48b. The terminal A1- is connected to the
terminals 47a, A2- and VC2-. The terminal A2 + is connected to the terminal 50a.
[0025]
The terminal 48a is connected to the terminals 49a, 50b and VC2 +. The terminal 47b is
connected to the terminals VC1- and 49b.
[0026]
As a result of the mounting portions 47, 48, 49, 50 being arranged in a row in the lateral
direction of the fuse 32, the mounting portion row 46 can be made smaller than in the case
where they are arranged in the longitudinal direction. Contributes to the miniaturization of the
vessel 30.
[0027]
FIG. 6 is a front view of the input impedance switch 30. As shown in FIG.
The mounting portions 47, 48, 49, 50 are arranged in a row in the lateral direction of the fuses
32 mounted thereon and are disposed in the mounting portion region 59. The longitudinal x
lateral dimensions of the mounting portion area 59 are 4S x L (S and L are as defined in FIG. 3
and FIG. 4). )となっている。
[0028]
The illustrated mounting area 59 is adapted to the mounting of the fuse 32 (FIG. 3) rather than
the cylindrical jumper wire 36 (FIG. 4), and the mounting sections 47, 48, 49 of the mounting
area 59. , 50 have slit-like insertion holes 58 for inserting and removing the flat legs 34 of the
fuse 32 on the left and right. In the mounting portion region 59, a 2S × L cover plate 70 (FIGS. 7
09-05-2019
8
to 9) is mounted so as to adjust the position of the mounting portion row 46 in the row direction.
The cover plate 70 may be a sliding type that slides in the longitudinal direction of the mounting
portion region 59 or may be removable.
[0029]
The terminals VC1 +, VC1-, VC2 +, VC2- of the input impedance switch 30 are fixedly connected
to the terminals VC1 +, VC1-, VC2 +, VC2- of the voice coils VC1, VC2 as described above. Nuts
57 are provided on A1 +, A1-, A2 +, A2- of the input impedance switching device 30, and the end
portions of the cables from the ± of the audio amplifiers AMP1 and AMP2 (FIGS. 7 to 9) can be
freely fastened. ing.
[0030]
Assuming that the impedances of the voice coils VC1 and VC2 are both 2 Ω, the input impedance
of the speaker 20 in the bi-amplifier connection (BI-AMP), the series connection and the parallel
connection is as follows. That is, it is 2 + 2 Ω in the case of the bi-amplifier connection, 4 Ω in
the case of series connection, and 1 Ω in the case of parallel connection.
[0031]
FIG. 7 shows the wiring and the mounting position of the fuse 32 when the voice coils VC1 and
VC2 are used in a bi-amplifier connection. The cables 64 and 65 connect the outputs + and-of the
audio amplifier AMP1 to the terminals A1 + and A1-, respectively. The cables 66 and 67 connect
the outputs + and-of the audio amplifier AMP2 to the terminals A2 + and A2-, respectively.
[0032]
The cover plate 70 is fixed in position to the mounting portion array 46 in advance by the user at
an appropriate time so as to cover the range of the mounting portions 48 and 49 in the lateral
direction of the fuse 32. As a result, after that, in the bi-amplifier connection of the voice coils
VC1 and VC2, the user correctly mounts the fuse 32 in the mounting portions 47 and 50 without
mounting the fuse 32 incorrectly in the mounting portions 48 and 49.
09-05-2019
9
[0033]
The output currents of the audio amplifiers AMP1 and AMP2 in the case of the bi-amplifier
connection of the voice coils VC1 and VC2 flow as follows. The output current of the audio
amplifier AMP1 flows in the order of AMP1 + → terminal A1 + → terminal VC1 + → voice coil
VC1 → terminal VC1− → terminal 47b → fuse 32 → terminal 47a → terminal A1- → AMP1-.
The output current of the audio amplifier AMP2 flows in the order of AMP2 + → terminal A2 +
→ terminal 50a → fuse 32 → terminal 50b → terminal VC2 + → voice coil VC2 → terminal VC2→ terminal A2- → AMP2-. The fuses 32 attached to the attachment parts 47 and 50 play the role
of preventing the overcurrent of the voice coils VC1 and VC2 with respect to the flow of such
current.
[0034]
FIG. 8 shows the wiring and the mounting position of the fuse 32 when the voice coils VC1 and
VC2 are used in series connection. The cables 64 and 65 connect the outputs + and-of the audio
amplifier AMP1 to the terminals A1 + and A2-, respectively. The cover plate 70 is fixed in
position to the mounting portion row 46 in advance by the user at an appropriate time so as to
cover the range of the mounting portions 47 and 48 in the short direction of the fuse 32. As a
result, after that, in the series connection of the voice coils VC1 and VC2, the user correctly
mounts the fuse 32 on the mounting portions 49 and 50 without mounting the fuse 32
incorrectly on the mounting portions 47 and 48.
[0035]
The output current of the audio amplifier AMP1 in the case of series connection of the voice coils
VC1 and VC2 flows as follows. AMP1 + → terminal A1 + → terminal VC1 + → voice coil VC1 →
terminal VC1 → → terminal 49b → fuse 32 → terminal 49a → terminal 50b → terminal VC2 +
→ voice coil VC2 → terminal VC2 → terminal A2 → → AMP1 flow. Although the fuse 32
mounted on the mounting unit 49 plays the role of preventing the overcurrent of the voice coils
VC1 and VC2 connected in series against the flow of such current, the fuse mounted on the
mounting unit 50 Since the terminal A2 + is in the open state, no current flows, and the terminal
32 is merely mounted on the mounting unit 50. However, the user can store it by mounting it on
the mounting unit 50 without preparing another storage place for the extra fuse 32, so
09-05-2019
10
management becomes easy and loss can be effectively prevented.
[0036]
FIG. 9 shows the wiring and the mounting position of the fuse 32 when the voice coils VC1 and
VC2 are used in parallel connection. The cables 64 and 65 connect the outputs + and-of the
audio amplifier AMP to the terminals A1 + and A2-, respectively. The cover plate 70 is fixed in
position by the mounting portion array 46 so as to cover the range of the mounting portions 49
and 50 in the short direction of the fuse 32 at an appropriate time in advance by the user. As a
result, the user subsequently mounts the fuse 32 correctly on the mounting portions 47 and 48
without mounting the fuse 32 incorrectly on the mounting portions 49 and 50 in parallel
connection of the voice coils VC1 and VC2.
[0037]
The output current of the audio amplifier AMP1 in the case of parallel connection of the voice
coils VC1 and VC2 flows as follows. The current supplied to the voice coil VC1 flows in the order
of AMP1 + → terminal A1 + → VC1 + → voice coil VC1 → terminal VC1 → → terminal 47b →
fuse 32 → terminal 47a → terminal A2 → → AMP1−. The current supplied to the voice coil VC2
flows in the following order: AMP1 + → terminal 48b → fuse 32 → terminal 48a → terminal 49a
→ terminal 50b → terminal VC2 + → voice coil VC2 → terminal VC2- → terminal A2- → AMP1-.
The fuses 32 attached to the attachment parts 47 and 48 play the role of preventing the
overcurrent of the voice coils VC1 and VC2 with respect to the flow of such current.
[0038]
FIG. 10 shows the connection between the input impedance switches 30a and 30b and the audio
amplifier AMP1 in the case of so-called serial-parallel connection. In the serial-parallel
connection, in each speaker, voice coils VC1 and VC2 are connected in series (serial), each
speaker is connected in parallel (parallel), and one audio amplifier AMP1 simultaneously drives
these two speakers It is. In each of the input impedance switches 30a and 30b of FIG. 10,
elements common to those of the input impedance switch 30 of FIG. 8 are designated by the
same reference numerals.
09-05-2019
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[0039]
In FIG. 10, the input impedance switches 30a and 30b are disposed in the respective speakers
(not shown), and the input impedance switches 30a and 30b use the voice coils VC1 and VC2 of
the respective speakers in series connection. The two fuses 32 are mounted to the mounting
portions 49 and 50, respectively, as in the case of the input impedance switching device 30 of
FIG.
[0040]
The cables 64a and 65a connect + and-of the audio amplifier AMP1 to terminals A1 + and A1- of
the input impedance switch 30a, respectively.
The cables 64b and 65b connect the terminals A1 + and A2- of the impedance switch 30a to the
terminals A1 + and A2- of the input impedance switch 30b, respectively. As can be seen from FIG.
5 described above, the terminals A1- and A2- of the input impedance switch 30a are shortcircuited, and the cable 65a changes the AMP1- to A2- instead of the terminal A1- of the input
impedance switch 30a. It may be connected.
[0041]
The relationship between the illustrated input impedance switch 30 and each element of the
present invention will be described. The terminals VC1 +, VC1-, VC2 +, and VC2- in the speakerside terminal row 42 correspond to the plurality of speaker-side terminals of the present
invention. A plurality of speaker side terminals of the present invention are connected to
respective terminals of two voice coils of the speaker.
[0042]
A1 +, A1-, A2 +, and A2- in the amplifier-side terminal array 43 correspond to a plurality of
amplifier-side terminals of the present invention. The plurality of amplifier-side terminals of the
present invention are connected to the output lines of the audio amplifier according to the biamp connection, series connection and parallel connection of the voice coil.
09-05-2019
12
[0043]
The mounting row 46 corresponds to the mounting row of the present invention. In the
mounting portion row of the present invention, each mounting portion can freely attach and
detach the connection conductor, and all the terminals of all the mounting portions (examples:
terminals 47a, 47b, 48a, 48b, 49a, 49b, 50a, 50b in FIG. 5) The mounting portions are arranged
in a row in the short direction of the connection conductor while being separated from each
other.
[0044]
The plurality of wires 54 correspond to the wiring circuit of the present invention. In the wiring
circuit of the present invention, the terminals of the mounting portion row are switched such that
the bi-amp connection, series connection and parallel connection of the voice coil is switched by
mounting one or more connection conductors to the mounting portion corresponding to each
connection. The speaker side terminal and the amplifier side terminal are connected.
[0045]
As a result of arranging the mounting portions in a row in the direction of the short side of the
connecting conductor, the size of the mounting portion array can be reduced, and hence the
speaker input impedance switching device can be miniaturized.
[0046]
As any of the voice coil bi-amplifier connection, serial connection and parallel connection, it is
necessary to attach one or more connection conductors to any of the attachment parts of the
attachment part row for the realization, so as a connection conductor In the case of employing a
fuse, it is possible to eliminate the need for providing a place for placing the fuse separately from
the mounting row.
[0047]
In the speaker input impedance switching device according to the present invention, preferably,
two wiring circuits each include a bi-amp connection, a series connection and a parallel
connection of voice coils to the mounting portion row (eg, mounting portions 47 and 50 in FIG.
09-05-2019
13
7). The wiring circuit is achieved by mounting one (for example: mounting portion 49 in FIG. 8)
and two (for example: mounting portions 47 and 48 in FIG. 9) connection conductors.
At the time of series connection of the voice coil, another mounting part (for example: mounting
part 50 in FIG. 8) maintains the mounting connection conductor in a currentless state despite the
mounting of the connection conductor thereto. It is a wiring circuit.
[0048]
Thus, since the two connecting conductors are secured in the mounting portion row in common
to the bi-amplifier connection, the serial connection and the parallel connection, it is not
necessary to prepare the storage place of the connection conductors separately from the
mounting portion row While being able to do, it can control the loss of the connection conductor.
[0049]
In the speaker input impedance switching device according to the present invention, preferably,
the mounting portion array comprises a total of four mounting portions (eg, mounting portions
47, 48, 49, 50 in FIG. 5).
The wiring circuit is the other two mounting parts except the two mounting parts for mounting
the connection conductor in order to achieve the bi-amp connection and parallel connection of
the voice coil (for example, the mounting part hidden in the cover plate 70 in FIG. 7) 48, 49, FIG.
9, the mounting portions 49, 50 hidden behind the cover plate 70, and one mounting portion on
which the connecting conductor is mounted for achieving serial connection of the voice coil
(example: mounting of FIG. 8) The other two mounting parts (e.g., in FIG. 8) except the one
mounting part (e.g., the mounting part 50 in FIG. 8) in which the connection conductor is
maintained in a currentless state even when mounted The mounting portions 47 and 48) hidden
in the plate 70 form a wiring circuit which is a non-mounting row portion as two consecutive
mounting portions in the mounting portion row.
Then, a cover member (for example, a cover plate 70 having a size 2S × L of FIG. 7 and the like)
is mounted so as to cover the non-wearing row portion.
09-05-2019
14
[0050]
Thus, by using a common cover member for the voice coil bi-amp connection, series connection
and parallel connection, the attachment of the connection conductor to the wrong attachment is
prevented. In addition, since the cover member is used for any connection, it can be prevented
from being stored or lost in another place.
[0051]
In the typical wiring circuit of the present invention, in the case of bi-amp connection of voice
coil, the two mounting parts for mounting the connection conductor are the first and fourth
mounting parts from the one end side of the mounting part row (example: illustration 7
mounting portions 47, 50). In the case of parallel connection of voice coils, the two mounting
parts for mounting the connection conductor are the first and second mounting parts (eg
mounting parts 47 and 48 in FIG. 9) from one end of the mounting part row . In the case of series
connection of voice coils, the connecting conductor is maintained in a non-current state even
when attached to one mounting unit to which the connecting conductor is attached; One of the
second mounting units (for example, the mounting unit 49 in FIG. 8) and the other (for example,
the mounting unit 50 in FIG. 8).
[0052]
Although the present invention has been described in terms of various specific embodiments, the
present invention is not limited to this, and various constituent elements in various specific
embodiments may be modified (including deletion) without departing from the scope of the
invention. ) Can be embodied. In addition, various inventions can be formed by replacing
constituent elements among various concrete modes or combining plural structural elements of
various concrete modes.
[0053]
It is a schematic perspective view of a bobbin. It is a schematic sectional drawing of the speaker
containing a bobbin. It is a perspective view of a fuse. It is a perspective view of a jumper wire. It
is a figure which shows the wiring state inside and outside in an input impedance switching
09-05-2019
15
device. It is a front view of an input impedance switching device. It is a figure which shows the
mounting position of wiring in the case of using a voice coil by a bi-amplifier connection, and a
fuse. It is a figure which shows the mounting position of wiring in the case of using a voice coil
by serial connection, and a fuse. It is a figure which shows the mounting position of wiring in the
case of using a voice coil by parallel connection, and a fuse. It is a figure which shows the
connection relation in the case of serial-parallel connection.
Explanation of sign
[0054]
20: Speaker, 30: Input impedance switching device (input impedance switching device) 32: Fuse
(connection conductor) 36: Jumper wire (connection conductor) 42: Speaker side terminal row
43: Amplifier side terminal row 46: Mounting portion row 47: Mounting portion 48: Mounting
portion 49: Mounting portion 50: Mounting portion 54: Wiring 70: Cover plate VC1: voice coil
VC2: voice coil AMP1: audio amplifier AMP2: Audio amplifier
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