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JPS53129672

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DESCRIPTION JPS53129672
Description of the Invention Optical displacement response device A light emitting element, a
light receiving element, an optical fiber connecting the light emitting element and the light
receiving element with a gap between them and a displacement means engaged with the optical
fiber An optical displacement response device comprising: an optical fiber bent according to a
displacement of the displacement means to change the gap so that an output of the light
receiving element is changed, and the output is responsive to the displacement.
Claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical
displacement response device, in particular to a displacement response device utilizing the
flexibility of an optical fiber. The displacement detection or response device has conventionally
been provided with various means, but the present invention aims to obtain a device which is
simple in structure, reliable in operation and considerably quick in response. Although there are
many applications of such a device, there is a method of producing an electric output in response
to the vibration of the diaphragm of the speaker and negatively feeding it back to the amplifier to
improve the overall characteristics as a practical application of the present invention. . FIG. 1
shows an embodiment of a displacement response device according to the invention. Reference
numeral 1 denotes a light source, which is a light bulb 2 light emitting diode, a laser or the like
and passes through an optical fiber 3 via a conical optical fiber 15 as required to reach a bonding
surface 5. The reference numeral 5 has a substantially flat cross section, and is in close contact
with the light receiving optical fiber 6 of the same shape as the light receiving optical fiber 6 of a
similar shape. 6 is coupled to the photodiode, the phototransistor, the Cd8 cell and other light
receiving elements through the optical fiber 4 and the conical portion 16. Of course, the conical
portion may not be present, and 6 itself may be the surface of the light receiving element. Also,
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the light emitting part may be provided by the reversible principle. Now, by utilizing the
flexibility of the fiber (optical fiber), the relative displacement between 5 and 6 'and the output of
the optical coupling 75i transformation 2 with 5 and 6 change. The direction of displacement can
go up and down. The fiber may be a single i-to-multiple line. FIG. 2 divides the light receiving
surface into two parts as 7.8 and guides them to separate EndPage: 1 light receiving elements
9.10. For symmetrical operation, the output of 9.10 is produced, for example, via the differential
amplifier 11 on the output lead 戎. This device has little even-order distortion. 5 can also detect
its rotational movement from the lead 12. In the apparatus shown in FIGS. 1 and 2, the smaller
the contact surface 5.6 is, the more foolish the minute displacement is. FIG. 3 shows another
embodiment of the present invention in which the output light of the light emitting element is led
to a fairly flat fiber 13 and brought into contact with the light receiving fiber 14 of the similar
shape at a short distance and mutually displaced. The output of 2 responds to this displacement.
FIG. 4 shows another embodiment of the present invention, wherein the end of the light emitting
element at the end of the output cuff is made use of the flexibility of the fiber with respect to the
end of the light receiving fiber 21 so that its surface is rotated to change θ. . This is due, for
example, to the rotation of the axis n. This device is suitable for detecting rotational
displacements. In FIG. 5, the light of the light source 1 is guided to the flat part weir through a
part of the fiber and is transmitted to the light receiving element 2 connected to the
corresponding part of the flat fiber. The wedge may be pivoted at the pivot 5 and the turn may
be tapered at the end as shown.
Alternatively, another light receiving fiber may be placed like a tuft, and two light receiving
elements may be connected to this to be operated symmetrically as shown in FIG. In Fig. 6 (a),
since the fiber ridge is narrow at the middle ω, the curvature changes when it is displaced as
shown by the arrow, especially when the radius of curvature becomes about 10 times or less of
the cross section. If the transmission is close due to the displacement, the change in the twist
angle greatly affects the transmission characteristics and can respond to the displacement. In
FIG. 7 (a), the fiber between the light receiving element and the light receiving element in FIG. 7
(a) has no surface low refractive index coating at the middle between 31 and the wing, and an
optical loss body 2 such as a black plate has an arrow as shown in FIG. To change the damping
and change the output of 2. In FIG. 7 0) the same fiber tapers the coating to the same extent, and
the same absorption block 兜 絆 is the arrow mark, and the damping increases as it moves to the
outer cloth. Change the displacement to a change of 2 output powers. In FIG. 8 (a), the light of
the light emitting element is reflected at the lower end of the fiber 52 to the object side and
transmitted to the light receiving element 51 through a part of the light receiving fiber, and an
output is obtained from the read dot. The output of the tool changes according to the
displacement as shown by the arrow of the eyebrow. In order to increase the reflectance
according to the critical condition, it is assumed that the surface is a mirror surface Q 牟 surface
or the like. In addition, the shape of the surface of the group can be properly adjusted and the
straightness can be within the term. The lower ends of 52 and 53 are made thinner or thinner as
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required. In FIG. 8 (b), the light of a group such as a semiconductor laser is guided downward by
a part of the fiber and is reflected by the object 59 to cause a reaction to the light emitting
element. . FIG. 9 is a block diagram showing an example of a method of improving the
characteristics of a speaker using the displacement response device of the present invention. 0φ
is a signal source, 41 is an amplifier, and 42 is a speaker. Using the processing circuit 43, the
negative feedback to the human power 41 is made to improve the characteristics. 葛 input
amplification, filter, delay 2 equalization, etc. as necessary. FIG. 10 shows an example in which
the device of the present invention is applied to the system of FIG. As a result, the abovementioned various displacement response devices are towed in the speaker diaphragm.
Correspond to the above according to the number. Of course, eleven or more of these response
devices can be used. The displacement response device of the present invention generally
responds to displacement by utilizing the flexibility of the optical fiber, which naturally occurs in
the two cases described above,-the light receiving element can be converted, and the flexible
portion is either One side is good. If necessary, a lens, a mirror, a prism, etc. may be used in
combination. 0 It is obvious that a diaphragm or a piece attached to the device of the present
invention becomes a microphone, and a needle attaches a pickup.
FIG. 11 shows three examples of microphones according to the present invention. In FIG. 11 (a),
the light transmission between the light transmission fiber 70 and the light reception fiber 71
changes in response to the vibration at the reflection part 72 of the diaphragm n to change the
output of the light receiving element 2. 11 (Φ) is a collection of a plurality of elements as shown
in FIG. 11 (II), and the light from the light sources 79 and 80 is reflected by the diaphragm from
the tip of the fiper π, 77-··· EndPage: 2 The light is transmitted to the light fibers 76, 78,..., And
an output is generated to the light receiving elements 81, 82, 83, 84. In FIG. 11C, the apparatus
as shown in FIG. 2 is applied, and the light of the light source 1 drives the differential amplifiers
11 from the light receiving elements 10 and 11 through the fiber 7.8 in the form of positives
from the fiber 5. FIG. 12 (a) shows an example of a pickup according to the present invention.
The configuration shown in FIG. 2 is used. The light of the light source 1 passes through the fiber
(4) and passes through the vibration needle 910 base to form two fibers 7.8. The light receiving
elements 9 and 10 are reflected by the upper part 97 of the zero point needle 91 for driving the
cyan tube 11 and enter the light receiving element% 96 via two fiber ends 92 ° 94. Shame,
although it is possible to obtain a push-pull signal from 96, a stereo signal can be obtained
separately from 95 and 96 if the plane of 93.94 is approximately orthogonal and the shape of
the plane of 97 is appropriately curved. Each of 93 and 94 can be made into a push-pull
configuration as shown in FIG. The present invention is not limited to the specific example
described above, but it is possible to use different combinations of planting variants and parts of
the embodiments.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of an optical displacement
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response device according to the present invention. 1 light source 2 light receiving element 3.4
optical fiber 5.6 optical fiber end face. FIG. 2 shows another embodiment of the response device
of the present invention. 7.8 ······· Optical fiber end face, 9, 10 ··········· Light receiving element, 11 ····
Differential amplifier. FIG. 3 shows an embodiment of the response device of the present
invention. 13, 14 · · · · · · Flat optical fiber in contact. FIG. 4 shows another embodiment of the
response device of the present invention. Optical fiber end · · · · · · · · · · · · · · Flexible optical fiber
end, n · · · · · · · · · · Figure 5 shows another embodiment of the response device of the present
invention . U · · · · Flexible optical fiber end, 5 · · · · · · · · · · · · · · · · · · · · Fixed optical fiber end, 26 '-· ·
· Other fixed optical fiber end . FIG. 6 shows another embodiment of the response device of the
present invention. I ··· Optical fiber, ω · · · · · · (9) thin wrinkled portion, 61 · · · · · · (9) twisted
portion. FIGS. 7 (a) and 7 (b) show another embodiment of the response device of the present
invention. 31.32 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
wedge shaped light loss body, I · · · · · · · taper the coating Optical fiber, a light loss body. 8 (a) and
8 (b) show other two embodiments of the response device according to the present invention. 0:
light emitting element 51: light receiving element 52; · Transmitting optical fibers, clusters
························································································································ Optical fiber, • ········· Laser, 57 · −・
・ ・ ・ ・ ・ Input / output lead, ...... ... Reflector, 9 ... ... Reflector. FIG. 9 shows a feedback circuit
block diagram of a speaker to which the response device of the present invention is applied. 41
...... amplifier, C ...... loudspeaker vibrating member, 4 ...... processing circuit. FIG. 10 shows an
example in which the system of FIG. 9 is applied to the speaker cone using the response device of
the present invention. 42・・・・−スピーカーコーン。 FIG. 11 shows three examples of
microphones according to the present invention. 70 ...... delivery fiber, 71 ...... receiving fiber 72
...... reflection portion, 73 ... ... diaphragm, 74 ...... diaphragm support , 75, 77 ··· ··· Transmission
optical fiber, 76, 78 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · element.
The overhead view shows two examples of the pickup according to the present invention. 0...
Transmission fiber, 91... ..... EndPage: 3 #-112 rlt / second eye,? FIG. 4 (phantom t Δ) EndPage:
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