close

Вход

Забыли?

вход по аккаунту

JPS5340888

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPS5340888
■ Acoustic-electric conversion device ■ Japanese Patent Application No. 51-59079 [phase]
Application No. 45 (1970) December 26 · Japanese Patent Application No. 45-118872 division 0
inventor Takagi Satoshi Dokoshi Satoshi Co-Osame Mizushima Yoshihiko Co. 0 Assignee Nippon
Telegraph and Telephone Public Corporation Appointed representative Nippon Telegraph and
Telephone Public Corporation Musashino Telecommunication Research Laboratories Information
Patent Manager
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an acoustoelectric
converter to which the present invention is applied, FIG. 2 is an output voltage characteristic of
semiconductor powder according to the present invention, and FIG. 3 is acoustoelectric
according to the present invention. It is a figure which shows the alternating current resistance
characteristic of the semiconductor powder for converters.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an acoustoelectric conversion device using semiconductor particles mainly composed of a seleniumtellurium alloy. Conventionally, as an acousto-electric conversion device using semiconductor
powder, one using carbon powder as semiconductor powder is widely used in a transmitter
because it has high sensitivity. However, such a device has the disadvantages as described below.
That is, since carbon powder is produced from natural anthracite coal, the quality is nonuniform,
and it is difficult to equalize the quality depending on the manufacturing conditions, and the yield
is also low. Also, the characteristics of the transmitter are largely dispersed, exhibit large
hysteresis phenomena with respect to the supplied current and sound pressure, large nonlinear
distortion, and the operation [111111] is unstable. In addition, as an acoustoelectric conversion
device using a semiconductor, one using a PN junction, one using a piezoelectric effect or a
piezoresistance effect of a semiconductor bulk, etc. are conventionally considered, but all of them
05-05-2019
1
are carbon transmitters. There is a disadvantage that the sensitivity is significantly lower than
that of The present invention is intended to provide a semiconductor alloy powder for an
acousto-electric conversion device containing a selenium-tellurium alloy as a main component in
order to solve the above-mentioned problems, which will be described in detail below. FIG. 1
shows an acoustoelectric converter to which the present invention is applied. In FIG. 1, 1 is a
duralumin diaphragm having an outer diameter of 46 mm, 2 is a movable electrode coupled to
the diaphragm 1, 3 is an R washer 4 and 5 The fixed electrode 7 is fixed to the aluminum frame
6 by the above, 7 is a silk washer. A powder chamber 8 having a volume of 0.4-5 CC surrounded
by the movable electrode 2, the fixed electrode 3 and the various washers 4 and 7 is filled with
semiconductor particles described later. It is unclear as to the principle of operation of the
acousto-electric conversion device using this semiconductor powder, or the phenomenon is as
follows. That is, when sound pressure is applied to the diaphragm 1 in a state where DC power is
supplied from the outside between the movable electrode 2 and the fixed electrode 3, pressure is
applied to the semiconductor particles filled in the particle chamber 8. Then, the electric
resistance between the powder particles themselves and the contact electric resistance between
the powder particles change, so that the electric resistance between the movable electrode 2 and
the fixed electrode 30 changes, which can be taken out as an electric signal output. In this way,
an electrical signal output corresponding to the sound pressure can be obtained by the present
apparatus. Next, the semiconductor powder according to the present invention will be described
in more detail. First, telluride is used as a semiconductor. First, a 99.999% purity tellurium ant is
filled in a quartz boat, this boat is put in a glass tube (ampoule) sealed at one end, and the air is
exhausted. [111111] EndPage: A vacuum degree of about 11 O-6 Torr. Seal it.
Then, the glass ampoule is placed in an electric furnace and heated to a temperature several tens
of degrees higher than the melting point (453 ° C.) of tellurium to melt the raw tellurium.
Thereafter, when cooled to room temperature at a rate of about 1 ° C./min, tellurium crystals
are easily obtained. Then, the tellurium crystal is taken out of the boat and put into a mortar and
crushed. The tellurium powder thus obtained is sieved to select an appropriate particle size from
the range of 0.1 to 0.4 mm, and the powder is packed into the powder chamber 8 by 1.72. The
resistance between the movable electrode 2 and the fixed electrode 3 at this time is 500Ω. Next,
the case of selenium and tellurium alloy will be described. A 99.999% pure selenium and a
tellurium raw material of the same purity are packed in a glass ampoule at a ratio of 3 near by
weight. This glass ampoule is evacuated and sealed at a vacuum of about 10 -6 Torr. Then, the
glass ampoule is placed in an electric furnace and heated to 380 ° C. or higher to melt the raw
material. Then, the glass ampoule is vibrated to mix and stir selenium and tellurium as raw
materials, and then cooled to room temperature at a rate of about 1 ° C. per minute, crystals of
selenium-tellurium alloy can be easily obtained. The powder grains obtained by grinding the alloy
crystal are sieved, and those having a particle size of 0.1 to 0.4 Tt 71 and having an appropriate
particle size are charged 142 in the powder grain chamber 8. The resistance between the
movable electrode 2 and the fixed electrode 3 at this time is 8 Ω. The resistance changes
05-05-2019
2
depending on the selenium concentration of the alloy, and the higher the selenium concentration,
the higher the resistance. FIG. 2 shows the output voltage characteristics of the semiconductor
powder according to the present invention described above, which is measured using the
acoustoelectric converter of FIG. In the figure, the horizontal axis represents the direct current
value supplied from the external constant current power supply between the movable electrode 2
and the fixed electrode 3 of the acoustoelectric converter of FIG. The vertical axis represents an
AC output voltage induced between the electrodes when a sound pressure of about 1 μbar at a
frequency of 1 kHz is applied to the diaphragm 1. FIG. 3 shows the AC resistance characteristics
of the semiconductor powder shown in FIG. 2, which was measured using the acoustoelectric
converter of FIG. In the figure, the horizontal axis represents supplied DC current, and the
vertical axis represents AC resistance at a frequency of 1 kHz. 2 and 3 also show the
characteristics of the conventional carbon transmitter for comparison. The hysteresis for the
supplied direct current and the [111111] sound pressure of the semiconductor powder
according to the present invention was very small compared to the carbon transmitter, and the
operation was stable.
The distortion of the output voltage waveform with respect to the human power sound pressure
waveform is also smaller than that of the carbon transmitter, and the distortion attenuation
amount is 6 dB smaller than that of the carbon particle. In addition, the selenium-tellurium alloy
exhibits a thick output voltage exceeding that of carbon when the supplied direct current is a low
current of 15 mA or less. This is advantageous for creating a transmitter with low supply current.
By using a selenium-tellurium alloy in this way, even better properties are obtained than using
elemental tellurium. The electric resistance of the semiconductor powder can be adjusted by
adding one or more kinds of halogen, lead, and antimony to the above-described semiconductor
powder mainly composed of the selenium-tellurium alloy. For example, when 0.05% chlorine is
added to a selenium-tellurium alloy, the output voltage hardly changes but the AC resistance
decreases by about 20%. In addition, when about 1% of lead is added to the selenium-tellurium
alloy, the output voltage increases by 10% and the AC resistance decreases by about 20%.
Furthermore, when about 1% of antimony is added to the selenium-tellurium alloy, the AC
resistance decreases by about 10%. From these facts, it means that it is possible to make a
transmitter having any internal resistance, for example, by adding one or several kinds of rogen,
lead and antimony to the semiconductor powder. As described above, when the semiconductor
powder for an acousto-electric conversion device according to the present invention is used, it is
easy to make the quality uniform and the production yield becomes high. In addition,
semiconductor powder particles have good stability because they do not have large gas
adsorption capacity like carbon. Further, according to the present invention, the electrical
resistance can be adjusted over a wide range by adding one or more kinds of halogen, lead and
antimony to the semiconductor powder. Further, if the semiconductor powder according to the
present invention is applied to an acousto-electrical converter, an output equivalent to a carbon
transmitter can be obtained, and other semiconductor elements can be obtained with an example
05-05-2019
3
of high sensitivity. If the semiconductor powder according to the present invention is applied to
an acoustoelectric converter, an acoustoelectric converter having an arbitrary electric resistance
and high sensitivity can be obtained.
05-05-2019
4
1/--страниц
Пожаловаться на содержимое документа