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JPS5520053

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DESCRIPTION JPS5520053
Description 1, title of the invention
The voice-electric signal conversion device 2, a vibrating plate vibrating in response to a step
sound signal, a porous slit plate disposed in a row on this vibrating plate, and the abovementioned vibrating plate are incident through the porous slit plate A light source for emitting
light, and a light receiving element for receiving a light beam which is incident on the diaphragm
from the light source through the porous slit plate and is reflected by the diaphragm and receives
the light beam passing through the porous 7 lit plate and converting it into an electric signal An
audio-electric signal converter characterized by comprising:
6. Detailed Description of the Invention The present invention relates to a voice-electric signal
converter for converting voice vibration into an electrical signal. An example of a conventional
apparatus for converting sound vibration into an electric signal using a photoelectric element is a
cartridge of a record player. FIG. 1 is a system diagram showing an example of this cartridge. In
the figure (11 is a light source, (2) is a light receiving element, (3) is a record needle, and (41 is a
single hole slit plate attached to the record needle). The operation of the example of FIG. 1 will
now be described. The voice vibration is transmitted to the slit plate (4) through the record
needle (3), and as a result, the slit provided in the slit plate (41 vibrates up and down. The light
beam emitted from the light source (1) passes through the slit plate (the slit of the light source
41) and reaches the light receiving element (2). Since the slit plate (41 is displaced up and down
to increase or decrease the passing amount of the light beam, the amount of light reaching the
light receiving element (2) changes in accordance with the sound vibration. Accordingly, it is
possible to convert a change in the amount of light incident on the light receiving element (21
into an electrical signal. Since the voice-electric signal conversion apparatus using the
conventional photoelectric element vibrates the single-hole slit as described above, it is a needle
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other than the cartridge of the record player that transmits vibration by an audio signal such as a
microphone. If the conventional device is applied to the diaphragm, the attachment is attached to
the diaphragm EndPage: 1, and the vibration of the diaphragm is added with a load
corresponding to the amount of the attachment, causing resonance to a specific frequency. It is
conceivable to have a point, which may deteriorate the frequency characteristics of the
microphone or the like. In addition, since only the single-hole slit plate directly changes the light
quantity, the electrical signal obtained with respect to the density of the light beam is small. The
present invention solves the above-mentioned drawbacks of the conventional device, improves
the frequency characteristics, and provides a sound-to-electric signal conversion arrangement
capable of receiving a larger electric signal when using a light source with the same light
quantity. It is FIG. 2 is a system diagram showing an embodiment in which the present invention
is applied to a microphone, in which 15) is a diaphragm which vibrates in response to an audio
signal and reflects it with respect to light, and (6) is a porous slit A plate, (7) is a light source, (8)
is a light receiving element, (9), DI is a convex lens. Next, the operation of the example of FIG. 2
will be described. The light beam emitted by the light source (7) is collimated by the lens (9) and
passes through the slit of the porous slit plate (6) and the diaphragm (51 The light is reflected
again, passes through the slit plate (6) again, is converged by the lens aerc, and enters the light
receiving element (8).
When the diaphragm (5) vibrates by voice, the distance between the diaphragm (5) and the
porous slit plate (6) changes according to the voice vibration. Therefore, it is possible to change
the view of the light beam passing through the porous slit, and an electrical signal corresponding
to the vibration of the sound can be obtained by the light receiving element (8). FIG. 3 is a crosssectional view showing how the amount of reflected light changes in accordance with a change in
the distance between the diaphragm (5) and the porous slit plate (6) in the example of FIG. In
FIG. 3, when the diaphragm (5) vibrates in response to the vibration of the voice, the distance to
the porous slit 16) changes and changes. Therefore, the light beam passing through the slit is
changed by the slit. FIG. 4 is a graph showing the change in the amount of passing light when the
distance between the diaphragm (5) and the porous slit (6) is further changed. In FIG. 4, the
horizontal axis (9) is the distance between the diaphragm (5) and the porous slit plate (6), the
vertical axis (6) is the amount of light passing through, and the slit hole width and the slit hole
distance are equal. Do. As shown in FIG. 4, a plurality of straight line portions appear in the
graph showing the change of the passing light t (b) with the change of the interval (a). This is
because, when the distance (a) is increased, the reflected light may pass through a slit hole
different from the slit hole which has passed when it enters. Assuming that the distance between
the diaphragm (5) and the slit plate (6) in the example of FIG. 2 is fixed at the (ao) point in FIG. 4
at the time of no vibration in the example of FIG. 3) can be an operating point. Assuming that the
coordinates of the start point of the straight part of the motion point ψ) are (ILIIPl) and the
coordinates of the end point is (L21p2), the motion point ψ) is (al, Pl) and (a2 * P2) The middle
point of the straight line part. Assuming that the change in the distance between the vibration
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reflector (51 and the slit plate (6) by voice is between the point (al) and the point (a2), it is
assumed that the diaphragm (5) by voice is Vibration can be provided as a linear change to the
passing scene. This is true for each straight line portion of the graph of FIG. Therefore, there are
a plurality of operating points, and an appropriate one may be selected. Next, considering the
width and spacing of the slits of the multi-aperture slit plate (6), the smaller the spacing, as much
as possible, in consideration of the maximum amplitude of the diaphragm (5) by voice, the larger
the amount of light for the same vibration Change can be given. That is, although an example in
which the slit width and the slit spacing are equal is described, the slope of the straight portion in
FIG. 4 becomes loose as the slit spacing becomes larger, and the slope becomes smaller as it
becomes smaller. There is.
However, as mentioned above, the maximum amplitude by speech must be in one linear part.
Although the embodiment of the present invention in the case of being applied to a microphone
has been described above, the present invention is not limited to the microphone but can be
applied to any means for converting voice vibration / motion into an electrical signal. -When
applied to a cartridge of a record player as an example, a record needle may be attached to the
center of the vibration reflecting plate (5) in FIG. 2, and the advantage of obtaining an electric
signal larger than that of the conventional device can be taken advantage. . As described above,
according to the present invention, the amount of light passing through the slit can be changed
more than that of the EndPage: 2 conventional device because of the use of the porous slit plate,
and a larger electric signal can be obtained. Further, since the vibration portion due to voice is
only the vibration reflection plate, there is an advantage that the possibility of occurrence of the
natural vibration which deteriorates the frequency characteristics of the microphone etc. is small.
4. Brief description of the drawings FIG. 1 is a system diagram showing an example of a
conventional photoelectric type cartridge, FIG. 2 is a system diagram showing one embodiment
of the present invention, and FIG. 3 is an example of vibration reflection in the example of FIG.
FIG. 4 is a cross-sectional view showing a change in the amount of light passing through the slit
plate due to a change in the distance between the plate and the porous slit plate, and FIG. It is the
graph which showed the change of in continuous. In the figure (51 is a diaphragm, (6) is a
porous slit plate, (7) is a light source, (8) is a light receiving element, (9) and α [a convex lens.
Agent Shino Nono-Figure 1 Figure 2 Figure 3 Figure 4 Susumu 1 2 1 2 1 1 2 1 1 1 J (J) J's
official 1, display of 'It' fi Japanese Patent Application No. 58- No. 92926 2, Title of the Invention
2, Title of the Invention Voice-to-Electric Signal Converter 3, Person Who Undertakes an Item 5
for Correction, Object of Correction
The voice-electric signal conversion device 2, a vibrating plate vibrating in response to a step
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sound signal, a porous slit plate disposed in a row on this vibrating plate, and the abovementioned vibrating plate are incident through the porous slit plate A light source for emitting
light, and a light receiving element for receiving a light beam which is incident on the diaphragm
from the light source through the porous slit plate and is reflected by the diaphragm and receives
the light beam passing through the porous 7 lit plate and converting it into an electric signal An
audio-electric signal converter characterized by comprising:
In column 6 of the detailed description of the invention of the specification, the contents of
correction (1+ line 3 of the specification, negative line 10, “receive signal” and correct “get
signal” are corrected. (21th letter 3 negative line 16 (9), (If it is lfjl, correct it as "(9), (d)"). (3) In
the same document, the fourth negative line, "horizontal axis (9)" is corrected as "horizontal axis
(a)". (4. In the same document, the fourth negative line, “vertical axis (61J and not“ vertical
axis (b) ”) are corrected. EndPage or more: 3
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