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JP2003299197

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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
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DESCRIPTION JP2003299197
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
optical acoustoelectric signal conversion device, and more particularly to an optical
acoustoelectric signal conversion device capable of miniaturizing the device.
[0002]
2. Description of the Related Art The configuration of a conventional optical acoustoelectric
signal converter is shown in FIG. An optical signal detection element 12 composed of a light
source and a light receiving element is fixed to the printed wiring board 1 shown in the figure.
The diaphragm 3 is fixed to the package housing 13 fixed to the printed wiring board 1 so as to
cover the light signal detection element 12. Further, a product cover 16 is fastened to the printed
wiring board 1 so as to cover the package housing 13.
[0003]
The space enclosed by the package housing 13 and the printed wiring board 1 is formed by the
holes provided on the upper surface of the package housing 13, the holes provided in the
product cover 16, and the holes 1a, 1a ... provided in the printed wiring board 1. It communicates
with the outside. A light source drive circuit 14 and an amplification / signal characteristic
adjustment circuit 15 are fixed to the outside of the package housing 13 on the upper surface of
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the printed wiring board 1.
[0004]
The light emitted from the light source of the light signal detecting element 12 is reflected by the
diaphragm 3 and received by the light receiving element of the light signal detecting element 12.
The output of the light receiving element is amplified by the amplification / signal characteristic
adjustment circuit 15, and the frequency characteristic is further adjusted to output an electrical
signal. In this manner, mechanical vibration of the diaphragm 3 vibrated by external sound is
converted into an electrical signal.
[0005]
In the above-described conventional optical acoustic electrical signal conversion device, the light
signal detection element 12, the light source drive circuit 14, and the amplification / signal
characteristic adjustment circuit 15 are mounted on the printed wiring board 1, and a hole is
formed in the printed wiring board 1. As a result, the mounting area is increased, and
dimensional errors of individual parts and positional errors of arrangement are integrated and
stable performance can not be obtained. Also, the number of assembling steps has been
increased.
[0006]
In addition, in the conventional acoustoelectric signal conversion device in which a coil and an
electrode plate are disposed behind the diaphragm, even if the cavity is variable for controlling
the directional characteristic, the effect is not improved, and the detecting device is improved.
There is a problem that it is difficult to miniaturize, such as making the amplifier circuit variable,
by using a plurality of.
[0007]
SUMMARY OF THE INVENTION The present invention has been made in view of the above
points, and the object of the present invention is to miniaturize the apparatus and simplify the
manufacturing process, It is an object of the present invention to provide an optical
acoustoelectric signal conversion device which can obtain stable performance.
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[0008]
Another object of the present invention is to provide an optical acoustoelectric signal conversion
device which can be miniaturized and can effectively control its directivity.
[0009]
The optical acoustoelectric signal conversion device according to the present invention reflects
light emitted from a light source by a diaphragm and makes the light incident on a light receiving
element and converts the sound received by the diaphragm into an electrical signal. In the optical
acoustic electrical signal conversion device to be changed, an opening is provided in a package
for mounting a lead frame to which the light source and the light receiving element are fixed, the
light source and the light receiving element are fixed on the surface of the lead frame The
amplification and signal characteristic adjustment circuit of is fixed.
[0010]
Further, according to the optical acoustic and electrical signal conversion device of the present
invention, an optical acoustic and electrical signal conversion is performed, in which light emitted
from a light source is reflected by a diaphragm and incident on a light receiving element to
convert the sound received by the diaphragm into an electrical signal. In the apparatus, an
opening is provided in a package for mounting the light source and the light receiving element,
and the acoustic directivity characteristic can be varied by increasing or decreasing the opening
area of the opening.
[0011]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical acoustoelectric signal
converter according to an embodiment of the present invention will be described with reference
to the drawings.
1 is a front sectional view showing an optical acoustoelectric signal converter according to a first
embodiment of the present invention, FIG. 2 is a side sectional view showing the same optical
acoustoelectric signal converter, and FIG. FIG. 3B is a bottom view showing the lead frame of the
lead-frame of the acoustic-electric signal conversion apparatus.
[0012]
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The lead frame 9 and the diaphragm 3 are fixed to the package housing 2 fixed to the printed
wiring board 1 shown in the figure, and the upper part of the diaphragm 3 is covered with the
cover 7 attached to the package housing 2.
The cover 7 is further covered by a product case 16.
[0013]
Holes are provided at positions covering the upper surfaces of the cover 7 and the diaphragm 3
of the product case 16.
Openings 2a and 2a are also formed in the lower side surface of the diaphragm 3 in the package
housing 2, and the space surrounded by the diaphragm 3 and the package housing 2 is
communicated with the outside.
[0014]
Sound from the outside is transmitted from the holes of the product case 16 and the cover 7 to
the diaphragm 3 to vibrate the diaphragm 3.
At this time, since the space inside the diaphragm 3 is communicated with the outside, the
compliance of the diaphragm 3 becomes large.
[0015]
A light source 4 consisting of a semiconductor laser element for converting the vibration of the
diaphragm 3 into an electric signal and a light receiving element 5 consisting of a photodiode are
mounted on the surface of the lead frame 9. The characteristic adjustment circuit 6 is mounted.
The front surface of the lead frame 9 is shown in FIG. 3 (a), and the back surface of the lead
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frame 9 is shown in FIG. 3 (b). As shown in the figure, the light source 4, the light receiving
element 5, the light source drive circuit, and the amplification / signal characteristic adjustment
circuit 6 are connected to terminals by bonding wires 10.
[0016]
The light source 4, the light receiving element 5, the light source drive circuit, and the
amplification / signal characteristic adjustment circuit 6 thus mounted are sealed by the glass 8
attached to the cover 7. Light from the light source 4 is reflected by the diaphragm 3 and
received by the light receiving element 5. Thus, the sound is converted into the electric signal of
the light receiving element 5, and further, it is amplified and frequency-adjusted by the
amplification and signal characteristic adjusting circuit 6 and output.
[0017]
As described above, the light source 4, the light receiving element 5, the light source drive circuit,
and the amplification / signal characteristic adjustment circuit 6 are mounted on the lead frame
fixed to the package housing 2, and the package housing 2 has the cavity inside the diaphragm
outside. Since the opening for communicating is provided, the device can be miniaturized, the
dimensional error can be reduced, and the manufacturing process can be simplified. As a result,
external noises are less likely to be received, and the operation is stabilized. If a signal processing
circuit such as a DSP is added to the amplification / signal characteristic adjustment circuit 6,
multi-functional processing can be performed by the detector itself.
[0018]
FIG. 4 is a sectional view showing an optical acoustoelectric signal converter according to a
second embodiment of the present invention, and FIG. 5 is a sectional view taken along the line
A-A in FIG. In FIGS. 4 and 5, the same members as those in the first embodiment are denoted by
the same reference numerals, and the detailed description thereof will be omitted. In this
example, a louver 11 is provided in the openings 2a and 2a of the package housing 2 in the first
embodiment, and the other configuration is the same as that of the first embodiment.
[0019]
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The shaft 11a of the louver 11 is rotated by a micromotor or a solenoid (not shown), and the
louvers 11, 11 can change the opening area of the openings 2a, 2a. The shaft 11a of the louver
11 may be rotated by a shape memory alloy whose temperature is changed by current.
[0020]
Assuming that the louvers 11 and 11 are fully open, as shown in FIG. As the opening is closed, as
shown in FIG. 6 (b), the forward directional characteristic begins to spread, and the insensitive
part at the side moves backward. Furthermore, when the opening is closed, the rear sensitivity
decreases as shown in FIG. When the opening is completely closed, the directivity is almost lost
as shown in FIG. 6 (d).
[0021]
As described above, in this embodiment, it is possible to miniaturize the optical acoustoelectric
signal conversion device and to control the directivity characteristic with a simple configuration.
[0022]
According to the optical acoustoelectric signal conversion device of the present invention, the
light source, the light receiving element and the amplification / signal characteristic adjustment
circuit are mounted on a lead frame fixed to the package housing, and the diaphragm is mounted
on the package housing. Since the opening for communicating the internal cavity to the outside is
provided, the device is miniaturized, the dimensional error is reduced, the operation is stabilized,
and the manufacturing process is simplified.
[0023]
Moreover, providing an opening in the package to increase or decrease the opening area of the
opening makes it possible to miniaturize the optical acoustoelectric signal conversion device and
to control the directivity characteristic with a simple configuration.
[0024]
Brief description of the drawings
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[0025]
1 is a front sectional view showing an optical acoustoelectric signal converter according to a first
embodiment of the present invention.
[0026]
2 is a side sectional view showing the same optical acoustic electrical signal conversion device.
[0027]
3 (a) is a plan view showing a lead frame of the same optical acoustical-electrical signal
conversion device, and FIG. 3 (b) is a bottom view showing the same lead frame.
[0028]
4 is a cross-sectional view showing an optical acoustoelectric signal converter according to a
second embodiment of the present invention.
[0029]
5 is a cross-sectional view taken along the line A-A in FIG.
[0030]
6 is a diagram showing the directional characteristics of the same optical acoustic electrical
signal conversion device.
[0031]
7 is a cross-sectional view showing the structure of a conventional optical acoustoelectric signal
converter.
[0032]
Explanation of sign
[0033]
DESCRIPTION OF SYMBOLS 1 printed wiring board, 1a opening part 2 package housing | casing
2a opening part 3 diaphragm 4 light source 5 light receiving element 6 light source drive circuit
and amplification and signal characteristic adjustment circuit 7 cover 8 glass 9 lead frame 10
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bonding wire 11 louver 11a axis 12 light signal detection element 13 package housing 14 light
source drive circuit 15 amplification and signal characteristic adjustment circuit 16 product case
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