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JPS57109499

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DESCRIPTION JPS57109499
Description 1 and title of the invention Electro-acoustic transducer (1) In an electro-acoustic
transducer comprising a permanent magnet, a diaphragm, and an excitation coil for driving the
diaphragm with a minimum number, the winding start and end of the coil J An electro-acoustic
transducer characterized in that there are a plurality of sets of winding terminals existing when
the winding start and winding end terminals are paired.
2, the scope of claims
6. Detailed Description of the Invention The present invention relates to the structure of an
electromagnetic acoustic transducer mainly. In recent years, it has become commonplace for
electronic timepieces to have an alarm function by sound emission, and when a wake up time, a
time to suit people or a meeting time, etc., be notified with a buzz and pleasant sound, which is
very convenient for the user. . In addition, nowadays business people who work busy often make
notes on the electronic watch as the all-important scheduled alarm times and act in accordance
with the notification sound. However, there are many cases in which 15 cases are forgotten
because they are busy and forget the matter of pronunciation time (for example, time to meet
people) which they noted. Therefore, at present, means of making a natural sound with an
envelope added as a monotonous sound of a fixed frequency as an alarm sound, or reporting
with a voice are under consideration. However, in a small electronic watch such as an arm voice
meter, this type of use is difficult in the electromagnetic type electroacoustic transducer
(hereinafter referred to as an electromagnetic speaker) conventionally used, and the reduction in
sound pressure is extremely high. Big EndPage: There is a drawback. It will be described in full
detail below. An example of the structure of a conventional electromagnetic speaker is shown in
FIG. Guide the magnetic flux generated from the permanent magnet 3 to the air circuit by the
plate 4, the magnetic core 5 and the movable iron piece IK. The movable iron piece 1 is fixed to
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the diaphragm 2 supported by the speaker frame 7 by welding or the like, and effectively
converts the vibration of the movable iron piece into a sound wave. The vibration of the movable
iron piece 1 is generated by the change of the magnetic flux between the magnetic core 5 and
the movable iron piece 1, and the magnetic flux change is generated by passing a direct current
to the excitation coil (hereinafter simply referred to as a coil). The electromagnetic speaker is
pronounced according to the above principle. Therefore, the movable iron piece lifts at a finger
movement frequency equal to the frequency of the current supplied to the coil and shakes the
finger moving plate. By the way, as well known from lifting dynamics, a lifting system consisting
of a movable iron piece l and a finger moving plate 2 always has a co-lifting frequency foffi.
Therefore, when the frequency of the current flowing through the coil 6 matches the common
frequency fOVc, the finger moving plate is excited and makes finger movement with a large
eyebrow width. For this reason, as shown in FIG. 2, the sound pressure of the electromagnetic
speaker is very large in the vicinity of the frequency f, but it is extremely low in frequency bands
other than semi. In FIG. 2, the horizontal axis is frequency, and the vertical axis is sound
pressure. In an example of an electromagnetic speaker currently used in an electronic watch, the
fo is approximately 4 KHz and the sound pressure at this frequency surpasses a bold sound
pressure of 804 B or more at a point 5ω away from the electromagnetic speaker. The noise level
is extremely low such as Vi 60 dB at frequencies other than n, particularly in the frequency band
below A kHz.
By the way, in order to totally realize that sound is generated from an electromagnetic speaker at
a sound pressure that only a person can perceive as a voice or natural sound total alarm sound,
which is the main object of the present invention, the frequency band of 4 KHz or less Above all,
it is required that the sound pressure in the frequency band at about 400 Hz to about 2 KHz is
large. This is because it is in the vicinity of the main frequency 1dlxag of human voice, and the
sound of the natural world is also on the order of several hundred Hz. Therefore, a large sound
pressure can be obtained when using a monotonous sound around JKHz as the alarm sound, but
if the sound etc. is pronounced with this electromagnetic speaker, the sound pressure is
extremely reduced and it is not possible to use it as an alarm sound. It is possible. The present
invention has been made in view of this drawback, and improves the method of driving an
electromagnetic speaker, and while using a small electromagnetic speaker built into an electronic
watch, it is a monotonous monotonous constant frequency present at about 2 to 5 KHz. It
provides an electromagnetic speaker that can output not only sound but also sound such as t [i
sound pressure. The present invention will be explained by the following examples. FIG. 3 shows
an embodiment of the present invention, which has two coils 61 and 62 around the magnetic
core 5, with the number of turns N and the DC resistance R ratio N / R being respectively
different. The other structure is completely the same as that of FIG. 1, and the same number has
the same function as that of FIG. However, as shown in, for example, FIG. 4, the winding
terminals are respectively connected to five evenings, min. The value of ratio N / H of 61 is large,
and 62 is small. . Therefore, when an equal voltage is applied to the coils of n et al., The product
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of the current factor (= V / R) and the number of turns N, and the 壕 IJ ア ン ペ ア ampere turn
value, coil 6I is large and coil 62 is small. By the way, the back pressure of the N @ speaker is
largely in proportion to the ampere-turn value of the coil. Explain the reason. In FIG. 3, the force
F acting on the movable iron piece 1 is proportional to the square VC of the magnetic sprout φ
between the movable iron piece 1 and the magnetic core 5 in FIG. -The total number of magnetic
fluxes of the permanent magnet 6 is equal to the sum of the magnetomotive force M of the
permanent magnet 6 and the magnetomotive force by the coil plus 1 re-aturn. Therefore, the
following equation is obtained as a conclusion. F (support) (M 2 + 2 M NI 10 N 2) Generally, it is
M / N, N 2 can be ignored. Although 1 Mt is a constant force regardless of the coil. Therefore, the
moveable iron piece 1 is proportional to a sword 2FO that has a finger pointing. Therefore, the
width of the movable iron piece 1 and the solid plate (the wedge width of the finger moving plate
2 is proportional to the size of the FO, the housing ampere turn value N, and the like. The
frequency characteristics when the coils 61 and 62 are separately used in the electromagnetic
speaker of the present invention of FIG. 3 are shown in FIG.
The horizontal axis is frequency, and the vertical axis is sound pressure. The solid line indicates
the case where the coil 61 is used and the ampere-turn value is large, and the broken line
indicates the case where the coil 621jf is used and the ampere-turn value is small. As shown in
FIG. 5, the sound pressure increases with the ampere-turn value, accompanied by 6-EndPage: 2.
Therefore, when the frequency of the voice band in the vicinity of lKHz is fully pronounced, the
coil 61 with a large ampere-turn value is used, and a monotonous sound utilizing a collision point
such as 4 KHz is used. It is also possible to emit sound pressure moderately as an alarm sound.
An example of the bad road of the sound producing unit in this case is shown in FIG. The coils 1
and 62 are the coils illustrated in FIG. The reference numeral 21 denotes an amplifier, 22
denotes a transistor, the amplifier output is connected to the coil 61, and the coil 62 is connected
to the end of the transistor n-. It is sufficient to input the constant frequency signal 26 such as
aKH2 to the base of the transistor 22 in the case of a monotonous sound in the case where the
voice is reported from the electromagnetic speaker 23. By the way, in the embodiment of the
present invention shown in FIG. 3, it has been described to change the ratio NZR of the number
of turns and resistance of the coils 61 and 62, but according to the circuit example of FIG. Effects
are obtained. (Of course it may be different. 2.) When using monotonous sound with both coils
61 and 62 in series connection, VC reduces the ampere-turn value. This is because the ratio N / R
of the number of turns N to the resistance R does not change even if the coils 61 and 62 are
connected in series, but doubling the number of turns increases the inductance of the coil and
increases the impedance. . Therefore, this is equivalent to the reduction of the ampere-turn value
described in FIG. The numbers in FIG. 7 are the same as in FIG. The case where the present
invention is used for damping sound is shown in FIG. 8+、82.83はコイル、as、
86.871dスイツチ、88はトランジスターである。 Scale signal 89 'to the base of
transistor 88? f: By inputting and switching to the switches 85 and 86. 87 in order, the ampereturn value that determines the driving force of the electromagnetic speaker 25 is reduced in time
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series, which makes it possible to attenuate sound. . Although it deviates somewhat from the
main object of this invention, there are the following as an example of using the multi-turn coil of
the present invention. In FIG. 9, two sets of coils 91 and 92 are wound around the magnetic core
5 while changing the winding directions.
By using the coil of FIG. 9, a sounding circuit as shown in FIG. 10 is possible. That is, in FIG. 10,
an audio signal 104 & gt; & apos; StA class amplifier 10IK input r and & agr; signal waveform on
the upper side is amplified n. In the All & amps 102 in the universal state, the signal waveform
inverted on the lower side of n1 is amplified by the inverting circuit 105. Therefore, by inputting
the moat and width signal at each amplifier 101 ° 102 to different coils 91 ° 92 in the winding
direction, for example, the force by which the probe iron piece is pulled by the coil 91 VC is
increased, the coil The movable iron piece is pulled by 92 (the force is weakened). As a result, the
electromagnetic speaker 25 can be driven in a push-pull manner simply by providing two A-class
amplifiers. FIG. 11 is a circuit diagram in the case where the electromagnetic speaker is not only
used as a sounding device but also used as a microphone for input of an audio signal etc. A coil
111 having a high resistance value of several tens of ohms, The coil 112 has an increased
resistance value. When the electromagnetic speaker 26 is used as a microphone, the coil 111
converts the signal 116 such as voice into an electrical signal by the principle of electromagnetic
induction. The converted electrical signal is input to the amplifier 115 and the like. In the coil
112, it is preferable that the resistance value of the coil 111 be larger than that of the fL
electromagnetic speaker, in which the sound signal 115 such as voice is input through the
amplifier 114 and the like. Further, the current value generated in the recoil 111 can not be
easily increased because it is necessary to improve the structure of the Sveker determined by the
magnetic circuit of the electromagnetic speaker. Therefore, the resistance value of the coil can be
increased to raise the voltage generated at the coil terminal, and it is also possible to obtain a
large output of about several millivolts. Conversely, even if the coil 111 is used for sounding, it is
impossible to obtain a high sound pressure because the resistance value is high and the ampere
turn value is small. Therefore, the coil 112 is necessary. Although the electromagnetic speaker
has been described in the eleventh embodiment, it is not necessary to be limited to the
electromagnetic speaker in particular, and the moving coil type electrodynamic speaker 1 '! It is a
matter of course that what is changed in F, EndPage: 3 is included in the present invention. An
example of a structure in which a coil satisfying the main point of FIG. 11 is adopted for the
electrodynamic speaker is shown in FIG. In the figure, 121 is a diaphragm, 122 is a plate, 123 is
a yoke, 124 permanent magnets, and 125 and 126 are voice coils according to the present
invention. The coil terminal is connected to a terminal provided on the back side of the yoke 123
as in FIG.
As described above, according to the present invention, by making a plurality of sets of excitation
coils of the electroacoustic transducer, the repulsive force is obtained at a sound pressure level
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substantially equal to that of a voice signal or natural sound, etc. Not only that, but also a simple
push-pull drive with an acid one-pass configuration, and an electroacoustic transducer that can
also be used as a microphone can be enabled.
4. Brief Description of the Drawings FIG. 1 is a cross-sectional view of a conventional
electromagnetic speaker, and FIG. 2 is a frequency characteristic diagram of the electromagnetic
speaker of FIG. FIG. 3 is an electromagnetic speaker structure diagram showing one embodiment
of the present invention, and FIG. 4 is a perspective view showing the terminal part of FIG. FIG. 5
is a frequency characteristic diagram of the electromagnetic speaker of FIG. FIG. 6 is an
application circuit diagram of the electromagnetic speaker of FIG. FIG. 7 is a circuit diagram in
which the coil connection method is changed in FIG. FIG. 8 is a circuit diagram in which the
present invention is applied to damped sound. FIG. 9 is an explanatory view of a coil in which the
winding direction is changed in another embodiment of the present invention, and FIG. 10 is a
circuit diagram in the case of applying the coil of FIG. 9 to push-pull drive. FIG. 11 is an
application circuit of an electromagnetic speaker according to another embodiment of the
present invention which can double as input / output of voice and the like, and FIG. 12 is a
sectional view of the speaker structure when it is applied to an electrodynamic speaker. 1 ...
movable iron piece 2 ... diaphragm 3 ... permanent magnet 4 ... plate 5 ... magnetic core 7 ...
speaker frame 61.62 ... coil ++, 12.15 ... Terminal 21 ... amplifier 22 ... transistor 23 ...
electromagnetic speaker 81.82.83 ... coil 91.92 ... coil 101. 102 ... amplifier 105 ... inversion
circuit Ml, +12 · · · .. coil +13. +14 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · permanent magnet 125. Run
[EndPage: 4] separate system distinction] ヰ 186 figure 1 M M soup lfi figure EndPage: 5
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