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Description 1, title of the invention
Electro-acoustic transducer using optical fiber
3. Detailed Description of the Invention The present invention relates to an electroacoustic
transducer using an optical fiber as an electroacoustic transducing material. Conventionally,
magnetostrictive type and electrostrictive type as electroacoustic conversion material.
Electrokinetic vibrators and the like are used, but in recent years, electroacoustic transducers
using optical fibers that convert sound into light are being put to practical use. The application of
light to a system is remarkable as the amount of information increases, and if the sensor itself
can convert sound into light, the application will be revolutionary as a whole system. Therefore,
an electro-acoustic transducer using an optical fiber is recently used, and if it is shown in FIG. 1,
it is necessary to increase the sensitivity by 100? The long optical fiber 1 of F1 or more is
linearly extended and the end portions are used as the light emitting end 2 and the light
receiving end 3. According to this, the installation of the optical fiber becomes large scale, and
the positions of the light emitting end 2 and the light receiving end 3 are separated, so that the
connection with the modulator / demodulator becomes complicated. An object of the present
invention is to solve the above-mentioned drawbacks, and an optical fiber is wound into one
structure so as to be one structure, and the vibration of the structure is used to create a reception
sensitivity frequency characteristic. It is characterized in that. Embodiments of the present
invention will be described below with reference to the drawings. FIG. 2 shows the first
embodiment, and 3 is an optical fiber, which is wound in a spiral shape, fixed in shape by a
molding material 4 and having a structure having an arbitrary receiving sensitivity frequency
characteristic as an integrated body. It is a body. 5 is light emission EndPage: 1 end, 6 is a light
receiving end and may be drawn out to the opposite side, but if drawn out to the same side as in
this embodiment, it is better for connection to a modulator / demodulator etc. Still, the optical
fiber may be wound in two or three. According to the above configuration, the mounting density
of the optical fiber can be greatly increased, and the electroacoustic transducer having high
sensitivity can be obtained, and at the same time, making the sensitivity more dog-friendly can be
easily achieved by increasing the number of turns. It is a structure. In addition, there is an
advantage that it is easy to handle and easy to install because it can be made compact.
Furthermore, since the light emitting end and the light receiving end are close to each other as
described above, the connection with the modulation / demodulation device can be made
extremely easily. FIG. 3 shows another embodiment of the present invention, in which the
vibration is detected only from the direction in the optical fiber 3 unified in the above
embodiment, and the longitudinal direction is detected in one place of the cylindrical body. It is
not necessary to form a mask 8 in which cut lowers are formed in the direction and arrange the
mask 8 so as to cover the periphery of the integrated optical fiber 3 and to direct the cutting
lowers in the direction required. In this structure, the vibration in the direction can be shielded to
detect the vibration only in the required direction.
Therefore, it is possible to detect the direction of the vibration source by rotating the mask 8 to
give a direction to sensitivity. According to the present invention having the configuration 9
function according to both of the above embodiments, it is much smaller and easier to handle
than the conventional electroacoustic transducer using an optical fiber, and the sensitivity may
be increased. Since this can be done by increasing the number of turns, a highly sensitive
electroacoustic transducer can be easily obtained. Furthermore, as compared with the
electrostrictive vibrator most commonly used as a receiver for underwater acoustic equipment,
the electrostrictive vibrator is easily affected by power supply hum because its impedance is very
high, and its thermal noise level is also low. There is a limit in raising the S / N ratio, and it has
the disadvantage that the shape changes depending on the frequency band used, but according
to the present invention, the power supply ham. It has the advantage that it is not affected by
thermal noise or the like and that the use frequency band can be widely used in one device.
4. Brief description of the drawings FIG. 1 is an explanatory view of an electro-acoustic
transducer using a conventional optical fiber, FIG. 2 is a perspective view showing an
embodiment of the present invention, and FIG. FIG. 7 is a perspective view of an example. 3 ...
optical fiber 4 ... mold 7 ... Setsuwari port 8 ... mask patent applicant Oki Electric Industry Co.,
Ltd. representative patent attorney Kanakura Kyoji 112EndPage: 2 procedure amendments
(spontaneous) 1981 9 Mon 1411 Patent Office Secretary 1) Haruki-den 1, display of the case
Patent application No. 065222 No. 2, the title of the invention light Fino (electro-acoustic
transformation 3 using, person to make correction 112EndPage: 2 procedure correction (
Spontaneous) Sept. 14 1957 Patent Office Secretary 1) Haruki-den 1, display of the case Showa
561 patent application No. 065222 2, name of the invention light Fino (electro-acoustic
transformation using 3, person's case to make correction Related patent applicant abbreviations)
Representative Masao Miyake 4, agent 5, date of correction instruction 6, target specification of
correction 4r obstacle description (me-detailed explanation column) 1 drawing. 7. Correction
content 1 Correct the description "Paged up" on page 3, line 4 of the specification to "Paged up".
2, page 3, lines 9 to 10 of the specification [The fllII construction is achieved by increasing. j is
corrected to “0, which is a structure that can be easily achieved by increasing”. 3 In the
specification, page 3, line 17, correct the “direction” as “the direction”. 4 Correct Fig. 2 and
Fig. 3 as shown in the attached drawings. Dance 2-13-EndPage: 3
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