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JPH01207798

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DESCRIPTION JPH01207798
[0001]
The present invention relates to an electrically controlled air flow generating device that
generates an air flow signal by an electric signal, and changes the air flow in function using
physical quantity conversion by magnetism, static electricity or the like. 2. Description of the
Related Art Heretofore, there have been, for example, sirens and the like as an apparatus for
forming an airflow signal by this kind of electrical signal. 3 and 4 show a conventional siren. As
shown in these figures, this siren is provided with a rotating wheel 1 δ in close proximity to the
supply port 13 of the compressed air flow supplied from the compressed air source via the
vibrator 11. The rotating wheel 15 is formed with a large number of holes 17 along the
circumferential direction and is rotationally driven by the motor 19. Therefore, the siren supplies
compressed air from the supply port 13 and forms an intermittent air flow by the rotation of the
rotating wheel 15, as indicated by an arrow in FIG. That is, the siren forms an airflow signal of,
for example, a predetermined frequency by an electrical signal. [Problem to be Solved by the
Invention] However, in such a conventional siren, since the rotating wheel is rotationally driven
by a motor or the like to form an intermittent air flow, the electric input signal to the motor is By
the time the intermittent air flow changed with respect to the fluctuation was formed, there was a
problem that a considerable time difference had occurred due to the inertia mass of the rotating
wheel. Then, when generating an airflow signal by an electrical signal, an object of this invention
is to provide the electric control type ¦ mold airflow generation apparatus with few time lags of a
frequency fluctuation. [Means for Solving the Problems] The present invention provides an air
supply means for supplying air at a pressure higher than atmospheric pressure, a lead provided
in the flow of supplied air, and a drive means for vibrating the lead. An electrically controlled air
flow generator comprising signal supply means for supplying a predetermined drive electrical
signal to a drive means. According to the present invention, the lead disposed in the high
pressure air flow supplied by the air supply means is forcedly vibrated through the drive means
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by the driving electric signal from the signal supply means. As a result, vibration of the lead
forms a predetermined airflow signal. Therefore, since this lead has a small inertial mass, it
immediately changes and vibrates in response to the frequency fluctuation of the electric signal,
and there is no time delay of the frequency fluctuation therebetween. Hereinafter, embodiments
of the electrically controlled air flow generator according to the present invention will be
described with reference to the drawings.
F. Refrigeration FIG. 1 is a longitudinal sectional view showing an electrically controlled air flow
generator according to a first embodiment of the present invention. FIG. 2 is a block diagram
showing the entire configuration of the first embodiment. As shown in FIG. 2 in its entire
configuration, an air supply means, for example, a compressor 21 supplies an air flow having a
pressure higher than atmospheric pressure to a flow path provided with a lead 23 interposed. In
the figure, reference numeral 25 denotes driving means for driving the lead 23. The driving
means 25 is controlled and operated by an electric signal from the signal supply means 27
(which may be constituted by a microcomputer, for example). . As shown in FIG. 1, at the
connecting portion of the upstream vibrator 31 and the downstream vibrator 33 where the
compressed air flow (the arrow in the drawing) from the compressor 21 is formed, a lead made
of a thin plate made of metal or resin Reference numeral 23 fixes the base end thereof to the
downstream vibrator 33, and its tip end is vertically interposed in the figure toward the upstream
side. That is, the reed 23 is supported in a cantilevered manner so as to open and close the flow
passage 35 in the flow passage 35 of the air flow. Reference numeral 37 denotes a stopper for
restricting the vibration of the free end of the lead 23. For example, the surface may be formed of
felt, rubber or the like to absorb energy due to collision and prevent generation of noise. Here,
the driving means 25 has a pair of iron cores 41.43 arranged and fixed on the upper and lower
sides of the free end of the lead 23, and coils 45.47 wound around the iron cores 41 and 43,
respectively. There is. The iron cores 41.43 are positioned and fixed to the support 51.53 filled
with epoxy resin by screwing or the like. The screw-in type also makes it possible to adjust the
gap between the lead 230 front and back. The respective coils 45. 47 are connected to the signal
supply means 27 through the terminals 55 and 57, respectively. Further, although the lead 23 is
made of soft iron Fe, nickel Ni or the like or a alloy thereof and made of a ferromagnetic material,
when made of resin for reducing the mass, a plate material made of the ferromagnetic material
on the front and back both surfaces Shall be affixed. In the electrically controlled air flow
generator according to the above configuration, the compressed air from the air supply means
21 is supplied via the flow path 35. At this time, by supplying a predetermined electrical control
signal from the signal supply means 27 to the drive means 25, the lead 27 is forcibly oscillated at
an arbitrary frequency. As a result, intermittent air flow of desired frequency is generated.
In this manner, a predetermined air flow signal is obtained by the control signal from the signal
supply means 27. For example, it is conceivable to apply this as an artificial vocal cord, as a
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music siren, as an ultra-large PA speaker, and also as an automatic ringer. In this case, since the
lead 23 has a plate shape and a small mass, the response (to the change in the attraction and
repulsion force of the magnet 41. 43) to the signal is high. The flow path 35 can be effectively
shielded and, for example, it can be made to correspond to a tone signal. In particular, high
frequency characteristics are excellent. In addition, by shifting the current supplied to the coil
45.47 by 90 degrees in phase, it is possible to improve the followability to the drive signal at the
time of restoration of the lead 23. Note that the lead 23 can also be feedback controlled by
detecting the movement of the lead. In addition, the fact that the lead 23 blocks the flow path 35
only by the elastic restoring force of the reed 23 can be applied to the case of producing a lowpitched sound for which a high restoring speed is not required much. [Effect] As described above,
according to the present invention, in the case of generating an airflow signal by an electrical
signal, generating an instantaneously changed airflow corresponding to the frequency fluctuation
of the electrical signal. Can. That is, there is no time delay between them. In addition, the use of a
highly responsive lead simplifies its control.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a longitudinal sectional view showing an electric control type airflow generation device
according to a first embodiment of the present invention, and FIG. 2 is a view showing the whole
constitution of the electric control type airflow generation device according to the first
embodiment. FIG. 3 is a front view showing a conventional siren, and FIG. 4 is a cross-sectional
view taken along the line IV-IV in FIG.
21 · · · · · · · · · · · · · · · · · · · · · · · · · · · · / 1 · · · · · · · · · · · · · · · · · · · · · · · drive means, 27 · · · · · · Signal
supply means. Patent Assignee: Yamaha Corporation Attorney Attorney: Atsushi Sakurai ‒ Figure
2 First Implementation Block Diagram
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