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JPS6276898

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DESCRIPTION JPS6276898
[0001]
FIELD OF THE INVENTION In the present invention, an imaging moving member formed in a
substantially semi-cylindrical shape is aligned. The shape of the voice coil and shape of the voice
coil pertaining to the sliding force having a diaphragm in which a voice coil is wound or joined to
each connecting portion of the dynamically connected vibrator group. Relating to the
configuration structure to be created and the connection of the division network attached to
them. BACKGROUND OF THE INVENTION A speaker having a plurality of voice coils has a
configuration shown in FIG. 2 in which two voice coils are wound in one bo-bin as described in
JP-A-55-25265. . In addition, a spy having a cross-sectional structure shown in FIG. 3 as a
conventionally thin spy 1 ░ force. -There is a force (commonly called Nibrat Hara form). The
speaker of the present invention has a voice coil shown in FIG. 4 as described in Japanese Utility
Model Application Publication No. 59-174793. ?? These speakers have advantages but many
disadvantages. Hereinafter, the reason for the present invention and the advantage of the present
invention. Describe the point. [Conventional Example 1] A brush with a plurality of voice coils. As
described in JP-A-55-25265 as a force. Into the same bobbin, wound two voice coils. There is a
configuration shown in FIG. ??????? A voice coil 1 comprises a voice coil 2 for
reproducing (driving) the entire band, and a voice coil 4 for reproducing (driving) 200 Hz or less
by low-pass filters (L, P, F, 3). At that time, as shown in FIG. 5, the reproduced sound pressure
layer and wave number characteristics are reproduced by the voice coil 2 as shown by the
characteristic i and by the voice coil 4 as shown by the characteristic a and two voice coils 2.4.
As a result, the low frequency component of 200 Hz or less is emphasized as in the synthesis
characteristic C. In addition, the electrical impedance characteristics of the speaker become K,
which is a characteristic 2. The reason for this is that in the band below 200 Hz, the voice coil
2.4 is driven in parallel, so the predetermined electrical impedance Z ,. It becomes a value lower
than (for example, 8 ohms). Furthermore, since the coil is wound in an annular shape, an
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inductor. As it gets into the high-pitched range, electric The impedance Z increases, and the
characteristic 2 looks like 5. It becomes an electrical impedance characteristic. ?????
However, the operation of the power amplifier for driving the speaker tends to be unstable.
[Conventional Example 2] In recent years, a heat-resistant synthetic resin sheet (hereinafter
simply referred to as a plastic sheet) has become available, and as shown in FIG. Heat and
pressure forming and blowing on the diaphragm j connected in series.
The entire band of the cross-sectional structure shown in FIG. 5 is formed by bonding a voice coil
which is formed by a forming method such as forming and the voice coil 6 is wound or
previously formed into a voice coil 6 at each connecting portion 5b of the transducer group. The
form Spito I was to be manufactured. The advantage of this speaker 7 is that since it can be
configured to be light in vibration system, it can be configured as a speaker 7 that has better
transient characteristics as compared to the conventional cone-shaped full band type speaker
and that it is morphologically extremely thin. 6 On the other hand, as the mass of the vibration
system is reduced, as shown in Fig. 7, the reproduced sound pressure frequency characteristics E.
It does not become flat but the frequency gets higher (it gets higher. There is a drawback of
causing a step. The cause of this is -43 of the speaker as shown in FIG. The X1 minute of the
radiation impedance characteristic Zr depends on the frequency. To change. The radiation
impedance Zr is Zr = Rr 10) 'Xr. Here, Rr is called radiation resistance, and Xr is called radiation
rear 5ctance, which is approximate. Here, Zo: t Ц j sexual impedance CZo = poc density of air ?
C: speed of sound in air ?: wavelength ?: effective radius of diaphragm ?: angular frequency
(? = 2?f) f: frequency The speakers shown in FIG. 5 and FIG. . Although it is square, for the sake
of simplicity, Ma is a mass that is not related to frequency. This mass M ? is a mass added to one
side of the diaphragm and is called an air mass, which is twice the value of the speaker in the
infinite baffle. However, this relationship is substantially satisfied in the low band of ? <1, but in
the high band of k?> и 1, Xr gradually decreases as shown in FIG. 8, so that Ma also decreases. 1,
an output sound pressure level C3PL of a band of ? <1 in mass control region Cf> m, fo: lowest
resonance frequency) is obtained by the following equation. Here, C: constant B: magnetic flux
density of magnetic air gap 1: length of voice coil ?: effective radius of diaphragm Mo: effective
quality of vibration system! ??????????????????? Zs: electrical impedance
of voice coil The effective mass ? of the imaging system is the mass of the diaphragm M d, the
mass of the voice coil A 1. ,, additional mass of air. ??????? As can be seen from FIG. 8, at
ka) 10 frequency, as described below, the additional mass M ? of air gradually decreases to the
following equation. Here, ll: the strub function reproduction sound pressure frequency
characteristic has a step difference (h =, и и и poor sound quality) in FIG. The dimensions of the
speaker diaphragm of this characteristic E are 15 cm О 15 cm, and 2.6 f in the air / air additive
quality Ji 2 M'a, the mass of the moving plate Mc L ?1, 4!
I, mass M of voice coil. ??????????? In addition, the additional quality of air i Ha is
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the vibration system effective. The diaphragm is large because it is proportional to the cube of
the radius ?. ???? It is likely that this step gets larger as it gets closer. ?? [Conventional
Example 3] In the speaker 1 shown in the prior art example 2, as shown in FIG. 4 of Japanese
Utility Model Laid-Open Publication No. 59-174793, the voice coil is connected to the connecting
portion 5b of each vibrator 5? of the seven diaphragms 5. 6.7 bonds a voice coil wound or
prewound in a ring. However, this configuration has the following disadvantages. (1) Since the
voice coil 6.7 is wound in an annular shape, an inductance component is generated, and the
electrical impedance characteristic is increased according to the characteristics shown in FIG.
descend. As a result, critical high frequency components of all-band speakers are insufficient.
Also, if there is an inductance component, the construction of the split network becomes
complicated because the electrical impedance-Z of the voice coil can not be replaced with pure
resistance. (2) The real opening 59-17479! Voice cary described in No.1. In the method of
winding of le (Fig. 4),-one boy. Since it is difficult to increase the number of turns of the coil, a
plurality of superimposed coils are wound, and the voice coils 6.7 are connected in parallel. For
this reason, it is difficult to increase the number of turns of each voice coil (Boy 7 и length l of the
coil is short), and the impedance z H is low (and connected in parallel, so that the impedance Z 9
decreases. ????????? In order to reduce the allowable input, the narrow diameter wire
must be used. (5) Leads 6a-6b of voice coil 6.7. Since 7?-7b is provided on the opposite side, it
is an end. Two children 8 are required. [Purpose of the invention] In view of such circumstances,
the object of the present invention is to reproduce the whole band in the diaphragm 1 sheet, flat
high voltage frequency and characteristics, and good sound image localization, and voice coil
inductance The purpose is to provide a speaker with a good response and a low transient
response. [Summary of the Invention] 1-A plurality of connecting portions 5AK of each vibrator
5a of the diaphragm 5. ?? The voice coil is wound or preformed by winding. Join the A station
chair. And, the point of FIG. Raise the sound pressure level on the bass side as shown in. Or the
sound pressure level of the high-pitched sound side is indicated by 5 as indicated by the dashed
line 2. . A division network is connected to the voice coil driving each band so as to lower the
power, and the driving power is weighted to perform multiple driving to flatten the sound
pressure frequency characteristic.
Furthermore, the voice coil is not wound in a ring shape (annular shape), but is wound in a zigzag
shape at each connecting portion 5b of each vibrator 5? of the diaphragm 1 so that no
inductance component is generated. Embodiments of the invention will be described below with
reference to the drawings. Embodiment 1: This embodiment is a means for raising the level on
the side of the low-pitched sound 1 having a low sound pressure level. One example of the
structure of the speaker at that time is already shown in FIG. Here, 1 is a diaphragm, 5a is a
vibrator, 5b is a connecting portion of each vibrator group, and VC is a plurality of voice coils
and a connecting portion 5hK, which is wound or previously wound-formed and joined. There is.
9 is a plurality of magnetized magnets, 10, 11 is a yoke plate, 12 is. An edge supporting the
diaphragm 5, 15 is a frame. ?? FIG. 1 is a schematic diagram of a plurality of voice coils (VC)
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and their associated divided networks (D, N, W,). ????????????????????
???? Low-pass filters (L, P, F,) 18 division networks (H, P, F,) 19 are divided networks ~ (D, N,
TF ',). Here, in order to facilitate the detailed description of the invention, to increase the sound
pressure level (S, P, L,) of the bass II L by 6 dB, assuming that the above-mentioned step
difference is 6 dB: The electrical impedance of the voice coil 14 for high-tone side H reproduction
in FIG. 11 and FIG. The lines 15 and 16 are for reproduction on the low-pitched side,
respectively, and the wire length 21 of the voice coil 1402 times that for electric-in. The
impedance is 16 ?. Each disc 14, 15 and 16 has a magnetic flux density B and a magnetic gap.
Then, the voice coil 14 has a driving force F = Bli. It occurs. On the other hand, voice coil 15.16 it.
Since a current of 1 ░ each flows i / 2, the combined driving force of the two coils becomes F = 2
О (B О 21 О i / 2) = 2Hli, and the driving force of the bass qL is 6 dBf: high . As a result, as
shown in FIG. 9, the sound pressure side of L, p, F, and 18 become sound pressure frequency
characteristics (L, P). If it does not pass F, it is a characteristic shown by a dotted line) 6 and the
high-pitched sound 9JJH passing through H, p, F, 19 becomes a sound pressure frequency
characteristic ((if it does not pass H, P, F, It is a characteristic line shown by a dotted line).
Combining the characteristic and the ? results in a flat sound pressure frequency force over the
entire band.
(1. However, in the case where the third embodiment is used in combination) Similarly, the
pressure and the electrical impedance characteristic as seen from the input terminal of the
speaker do not decrease more than the predetermined impedance value Z. If the difference in
level is 6 dB or more, the number of voice coils of the bass 941 L is successively increased or the
attenuator 20 is high. If the sound pressure level (S, P, L,) on the front side H is lowered. good.
Also, when the step difference is 6 dB or less, the electric impedance ZJP of the voice coils 15, 15
is-respectively. , 11 and 16 ?, and shorten the coil wire length l (make the cross section of the
coil smaller and match the electrical impedance Z), and adjust it to the sound pressure level of
the high-tone side H. Just do it. If the electrical impedance Z seen from the terminal of the
speaker is other than 8 ?, follow the voice coil according to this. Change the rule. Also of the
split network 17. It is better to select ka = 1 to 30 as the division frequency fc. In Conventional
Example 1, only a limited band of 200 Hz or less, an increase in sound pressure level can be
achieved, and a decrease in electrical impedance Z occurs, but in the present invention, the sound
pressure level is increased over a wide band. It can be increased flat. As a result, it covers the
whole band. Sound pressure frequency characteristics are obtained, and the electrical impedance
curve significantly lowers the predetermined value Z. ???? Example 2: In this example, high
sound pressure level is high. It is a means to reduce the level of 1 ull H. FIG. There are multiple
voice coils and their accompanying divisions. 12 A wiring diagram of a network (D, N, W). Here,
21 and 22 are voice coils, and 25 is a divided network (, /) composed of a-no-multiple (L, PIF,) 24
and no-Ivas filter (11, P, F,) '25. , # JF,), 26. Attenuator CA1'T,), 27 is a total of the voice coil 22
and an electrical impedance Z, for making 8 ?. It is a resistor r. Here, the sound pressure level (S,
P, L,) of the high-tone side H is defined as ? on the assumption that the above-mentioned step is
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6 dB for easy detailed explanation of the present invention as in the first embodiment. In order to
decrease by 6 dB, assuming that the electrical impedance Z as viewed from the terminal of the
speaker = 80, the voice coils 21 and 22 are connected in series with the same line length l. The
electrical impedance is 4? each, and the resistor 27 is 4?. Each voice coil 21 and 22 has a
magnetic flux density B.
It is located in the air gap. Speaker terminal Kj. When the current signal is applied, the bass side
signal. Because it flows to both voice coils 21 and 22. It is driving force F-Bx21x1-2 Bli. On the
other hand, since 1.1 high-pitched side H flows only to voice coil 22, driving power F = Bli, and
driving force F on high-pitched side H is 6 dB lower. As a result, as shown in FIG. 11, the bass
side passing through the a- 'bass filter (L, P, F,) 24 becomes the sound pressure frequency
characteristic (L, p, 1.24 In one case, it is the characteristic evening shown by the dotted line). ?
?????? The treble side H passing through the filters (H, P, F,) 25 is sound pressure
frequency-characterized (a field not passing through lLP, F, 25). (Characteristics shown by dotted
lines). If the characteristic Y 'is synthesized, it becomes flat sound pressure frequency% 1 и
characteristic across the entire band, and since the electric impedance of the voice coil 22 is 4?,
the sum with the resistor 27 makes 80 иии The air flow impedance curve seen from the input
terminal does not significantly decrease the predetermined value Z3-80. Thus, the voice coils 21
and 22 are simply straightened. When the insertion is 6 dB, the entire band K as in this
embodiment. A flat sound pressure cylinder wave number characteristic is obtained. 21, If the
step is 6 dB or more, the length of the voice coil 21! Long (> 4?), short the length l of the voice
coil 22 (<4?), and thicken the resistance value of the resistor 27 so that the combined electrical
impedance is 80 ((r> 40) And how to lower the sound pressure level of high-pitched sound side H
with the attenuator (AT T, 26). Is considered. Next, when the step difference is 6 dB or less, the
length l of the voice coil 21 is shortened (<4 ?) and the length l of the voice coil 22 is increased
<(> 40), C4 composite electricity, contrary to the above. The resistance value of the resistor 27
may be reduced (r <40) so that the impedance is 80. As described above, according to the
present invention, flat sound pressure frequency-wave number characteristics are obtained, and
the electrical impedance characteristics do not significantly decrease the l predetermined values
Z and P. It relates to the configuration and structural shape of the coil. . The speaker having the
structure shown in FIG. 6 has the structure / structure shown in the conventional example 21 ░
15. 2 (FIG. 4), and the point has already been described. Also, the voice of Conventional Example
2. According to the winding method of the coil, in the first and second embodiments, a voice coil
at each connecting portion 5b of each transducer 5?.
The cross-sectional structure of the coils 14, 15.16 and 21, 22 'increases the winding width W'1
when the winding length l of the voice coil VC' is constant as shown in FIG. 12 to FIG. If the
winding width W'1 is constant, the winding length! As a result, the magnetic gap length tg and
the thickness hp of the yoke plate 10 ░ become larger, and the magnetic flux density B of the
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gap becomes lower and the sound pressure level lowers. In order to avoid this, the crosssectional area of the magnet is increased, and the thin shape and shape which is the feature of
the speaker shown in FIG. 3 are also impaired. Further, in the winding method of the voice coil
shown in the prior art 2 (FIG. 4), an inductance component is generated by 1 иии and electric
inbidan is produced as it becomes higher. As a result, the driving force F decreases and it fits in
FIG. 'It showed 5K (to the chain line), sound pressure level (S, P,). L) decreases and does not have
flat characteristics. Therefore, according to the present invention, as shown in FIG. . The 16-scoil
VC is wound and shaped in advance in a zigzag shape, not in a wire ring (annular shape), and is
joined to the connecting portion 5b of the vibrator 5? of the diaphragm 5 and the reinforcing
portion 5C. As a result, the cross-sectional structure of the voice coil 14, 15.16 at each
connecting portion 5b of each vibrator 5? in the first embodiment can be configured as shown
in FIGS. 17 and 18 and the winding width W3 of the voice coil . The winding length l ? ? can
not be fat. In addition, since the magnetic circuit shown in Conventional Example 2 is used, the
magnetic gap length '! l * It is not necessary to increase the thickness of the yoke plate. In
Example 1 2, the example is as shown in FIG. 19 and @ 2 o ?. In addition, winding length of each
voice coil and flat wire is 1. As a result, it can be configured as shown in FIGS. 18 and 20. Also,
each voice coil is wound in zigzag. So there is no inductance (no. Because it has become an
induction winding), following the treble range. There is no rise in electrical impedance. The
result. Result, Wei: IIIJ force F does not decrease either, 1 ░, иии J, flat sound pressure frequency
characteristics without deterioration of phase characteristics can be obtained up to high range.
Since there is no inductance in the voice coil, the electrical impedance Z can be treated as a pure
resistance and the configuration of the division network is simple. [Effects of the Invention] As is
apparent from the above, according to the present invention, it is possible to reproduce flat
sound pressure frequency characteristics in the whole band with one diaphragm.
Furthermore, '1 air impedance characteristic is predetermined tt + ijZ,? It is possible to greatly
reduce (e.g., 8 [Omega]), and it is possible to flatten the phase characteristics. As a result, sound
image localization is good and transient characteristics. A speaker with good sound quality can
be obtained, and the operation of the power amplifier for driving the speaker can be stabilized.
Also, the technique of the present invention can be, for example, another type IIIJ6 electronic
speaker.
[0002]
Brief description of the drawings
[0003]
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FIG. 1 shows the voice of the speaker of Example 1 of the present invention.
A wiring diagram showing the structure of the Qucoil 1 division network etc., FIG. 2 is a wiring
diagram of a speaker having 102 voice coils according to the prior art, FIG. 3 is a sectional view
of the prior art and the present invention, and FIG. The voice coil winding method of the speaker
of the prior art example 5 and the structural cross section of the diaphragm and the voice coil,
FIG. 5 is a characteristic diagram of the speaker shown in FIG. 2, and FIG. 6 is the vibration of the
speaker of the prior art and the present invention Fig. 7 is a perspective view of the plate, Fig. 7
is a characteristic diagram of the speaker shown in the prior art 2, Fig. 8 is a radiation impedance
characteristic diagram of the same root of the piston, and Fig. 9 is the loudspeaker of Example 1
shown in Fig. 1 Fig. 10 is a schematic diagram showing the configuration of the voice coil of the
speaker of Example 2 of the present invention, the division network, etc., and Fig. 11 is shown in
Fig. 10. Invention of the Speaker in Example 2 Fig. 112 is a schematic view of the characteristics
showing the main point of the present invention, Fig. 112, Fig. 13, Fig. 14 and Fig. 15 are the
present invention. Multiple voice caries to carry out the speaker of. The conventional winding
method shown in FIG. Cross section of voice coil and diaphragm in case of Figure # c16 is an
actual 19 shown in FIG. 1 and FIG. In order to operate the first and second embodiments
effectively, the winding method and shape of the voice coil of the present invention shown in the
third embodiment K and the perspective view of the diaphragm, FIG. 17, FIG. 'Figures 19 and 20
are! ! According to the winding method of the voice coil of the present invention of the
embodiment 3 shown in FIG. It is structure sectional drawing of a voice coil and a diaphragm. .
Nose ... diaphragm 5? ... vibrator group. 5b и и и Connecting part 5c и и и ?. VC: Multiple voice
coils? ... Column-shaped magnet 10, 11 ... Yoke plate It12 ... Edge 15 ... Frame 15.14, 15.21.22 ...
Multiple voice coils и 17 и 23 и Division network 18. 24 ... L, P, F, 19, 25 ... H, P, F. 20, 26 ...
resistance attenuator (ATT) 1 и 27 ... resistors ? ... sound pressure frequency characteristics and
electrical impedance. Dance characteristics 1st figure 4 (?) 5th figure 6 Figure 5L 2 ? ? 50 ?
7 figure 8 figure 10 and figure 11? a-Muscle 12 Fig. 13 Fig. 14 Fig. 15 Open Fig. 16 (S)
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