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JPH11276476

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DESCRIPTION JPH11276476
[0001]
The invention relates to a novel electroacoustic transducer in which a battery and a microphone
are integrated. The transducer is preferred for use as the simplest power gain electric
stethoscope, heart sound microphone or fetal heart sound microphone.
[0002]
A carbon microphone superimposes an acoustic signal together with a bias stress on a deposited
portion of carbon particles of an appropriate size, modulates the electrical conductivity or
electrical resistance of the portion with the acoustic signal, and flows it there The DC current is
modulated to obtain an electrical signal corresponding to the acoustic signal. Among the
innumerable microphones, it is unique that it is a device that itself has power gain, although it is
not a reversible converter.
[0003]
That is, where modulation of resistivity is an intermediate result, at least in principle any large
direct current may be passed, so that it is possible to "control" large electrical energy with less
acoustic energy, and there Gain occurs. As a matter of fact, in a classical telephone or telephone
system, only the most primitive configuration of cyclic series connection of a carbon microphone,
a magnetic receiver and a battery is used, and transmission and reception of a considerable
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distance despite the loss of the line Was possible.
[0004]
However, batteries and carbon microphones are still separate components. In the present
invention, this is integrated with a fine structure to realize a structure in which the battery itself
is also a microphone (or an electroacoustic transducer) based on the carbon microphone
principle. The "battery microphone" according to the present invention thus realizes a
microphone (or electro-acoustic transducer) which does not require the display of a battery or a
separate power source and which has essentially a power gain.
[0005]
The only figure is a sketch showing an example of the battery microphone according to the
present invention, in which the whole is first of all a construction of a manganese battery which
follows the principle of the known classical battery cells. That is, the negative electrode (1) is a
zinc plate, and the positive electrode (2) is carbon. In this case, a group of granular carbon
particles is carried on a block of the depolarizer (3) mainly composed of manganese dioxide.
There is. The separator or electrolyte layer (4) can be, for example, the paper classically
impregnated with starch paste. Here, the characteristic difference from the structure of the
manganese battery that follows the textbook Liquelarche battery is that the positive electrode is
not made of a carbon plate but made of an aggregate of carbon particles. Here, the plate and the
granules are essentially equivalent in terms of the operation of the battery.
[0006]
A pressure element (5) is placed on the carbon particle group of the positive electrode, and a
transmitter (6) transmits an acoustic signal picked up from the airborne sound wave by the
vibrator (7). The design concept, structure and principle of this part are essentially the same as in
the case of a conventional carbon microphone. That is, in the carbon particle group, the
interparticle contact resistance, and thus the total resistance, changes in response to the applied
acoustic signal. Therefore, the whole is realized in which a variable resistor, which is a carbon
microphone, is connected in series to the battery, and moreover, the electric connection between
the battery and the carbon microphone is finished without the need to rewire the wire.
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[0007]
Therefore, only by externally attaching a low frequency transformer (8) having a direct current
return to this "battery converter" or "battery microphone", a direct current corresponding to the
overall loop resistance value and the electromotive force of the battery flows. Because it is
modulated with an acoustic signal, it is possible to deliver an audio signal to the load on the
secondary side of the low frequency transformer (8). Or, if the electrical impedance of the
earphone (11) is appropriate and if appropriate it has a DC return with current resistance, it is
also possible to connect it directly without going through a transformer. Thus, the configuration
of the figure is preferable for use as the simplest and power gain electric stethoscope, heart
sound microphone or fetal heart sound microphone.
[0008]
That is, all batteries whose acoustical force or internal series resistance can be "modulated"
acoustically or by mechanical vibration or stress fluctuation can be used to construct a "battery
microphone" of such concept, It falls within the scope of the present invention and can be used to
practice it. The above embodiment has been described on behalf of it.
[0009]
The element that can be modulated to carry out such a concept is, for example, the electrical
conductivity of each of the positive and negative electrodes, the electrical conductivity of a
depolarizer or separator, or the chemistry as a battery component in its general sense. It can be
reaction processing capacity etc. For example, in the case of a manganese battery, manganese
dioxide depolarizer blocks that are poorly compacted can exhibit such properties. However, even
if the zinc plate of the negative electrode itself is very good in electrical conductivity itself as a
granular zinc aggregate, it does not constitute a series resistance which can be significantly
modulated as intended here. However, in lithium batteries in which the negative electrode is
carbon, the carbon or its accumulation can be diverted to the realization of such a carbon
microphone.
[0010]
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Furthermore, as a chemical cell capable of modulating the output by mechanical vibration, in
addition to such a primary cell, a secondary cell, a physical cell, a fuel cell or the like can also be
used. Electrodes, separators, depolarizers, and the like can all be adopted as component elements
of the battery in which the modulation is performed.
[0011]
As clarified in the above description, the present invention is configured to change the
performance of at least one of the components of the battery in response to stress to constitute
the battery, It can be a battery converter characterized in that it is configured to be used as a
converter that self-stores an electrical energy source at a location that is sensitive to stress or
vibration, voice or the like.
[0012]
The invention also comprises, by way of example, a structure in which the granules are
assembled such that the electrodes are also electroacoustic transducers according to the carbon
microphone principle, and also having means for introducing an acoustic signal into the granules
Therefore, the microphone integrated with the battery may be characterized in that the battery is
used as a power supply unit and the electro-acoustic transducer functions as an acoustic sensing
unit having a power gain.
[0013]
In any case, the experienced person, the knowledgeable person or the person of the present
invention can implement innumerable modifications and expanded embodiments within the
scope of the present invention, and the above description is only an example.
[0014]
As clarified by the above description, according to the present invention, particularly in a
manganese battery or lithium battery provided with a carbon microphone, a power supply unit
and a sensing unit having a power gain are integrated. For example, an electric stethoscope with
amplification capability, that is, power gain, heart sound microphone, and fetal heart sound
microphone can be beneficially realized without using any semiconductor or electron tube
electric signal amplifier.
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