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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
waterproof sound collecting apparatus having directivity, in particular, to a sound collecting
apparatus which is attached to the outside of a bridge of a ship and collects a whistle or the like
of another ship.
2. Description of the Related Art A conventional waterproof sound collector of this type is in the
form of an electrodynamic microphone in which a voice coil is directly attached to a diaphragm
SUMMARY OF THE INVENTION In such a conventional waterproof sound collecting apparatus,
since the voice coil is attached to the diaphragm, the mass related to the diaphragm becomes
large, and the limit in the sensitivity is limited. is there.
In view of the problems described above, the present invention is completely waterproof, has
higher sensitivity than conventional sound collectors using electrodynamic microphones, and has
high directivity, and is suitable for ships. It aims at providing a suitable sound collection device.
SUMMARY OF THE INVENTION According to the present invention, the above-mentioned
problems are solved as follows.
(1) A diaphragm is attached in a watertight manner to the rear end of the horn-like introduction
tube that spreads forward, and a microphone is provided in a closed space behind the diaphragm.
(2) In the above item (1), an outer horn expanding in a forward direction, an intermediate horn
arranged at the inner center of the outer horn, and expanding in a rearward direction; An inner
horn is disposed at the center of the inside of the middle horn, and is formed by an inner horn
expanding toward the front end of the middle horn, and a diaphragm is attached to the throat
portion at the rear end of the inner horn.
(3) In the above item (2), a drain hole is provided in the throat portion at the rear end of the
internal horn.
(4) In any one of the above items (1) to (3), the microphone mounting plate fixed to the rear end
portion of the introduction tube so as to be positioned behind the diaphragm, has a shock
absorbing property. It holds with the holding member which has.
(5) In any of the above items (1) to (4), a closed box is provided at the rear end of the
introduction tube, and a microphone and its amplifier are provided in the box.
(6) In any one of the items (1) to (5), the rear end portion of the introduction tube is mounted on
the base so as to be adjustable in mounting angle around the vertical axis.
(7) In the above item (6), a mounting hole for the base is provided at the center of the bottom of
the base, and an arc shaped holding hole centered on the mounting hole is provided on both
sides thereof.
BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 shows an embodiment in which the
sound collecting apparatus of the present invention is installed on a ship (1), and four sound
collecting devices are mounted on a bridge (2) of the ship (1). The device (3) is fixed at a 90 °
interval so as to turn around the mast (2a) and to face the front, rear, left, and right.
The four sound collectors (3) all have the same structure, so only one in front will be described in
detail with reference to FIGS.
The sound collecting device (3) is provided on the upper side of a pair of side pieces (4b) (4b)
standing from both ends of the bottom plate (4a) in a base (4) whose frontal shape is upward Ushaped. It is mounted so as to be vertically rotatable with an axis (5) facing the direction.
Circular mounting holes (4c) are provided at the center of the bottom plate (4a) of the base (4),
and circular holding holes (4c) are provided at the left and right sides thereof. 4d) and (4d) are
respectively drilled.
Insert the bolt (not shown) screwed to the bridge (2) etc. of the ship (1) into the central mounting
hole (4c) (4c) and adjust the direction of the bottom plate (4a) The sound collector (3) is
horizontally mounted on the bridge (2) etc. by screwing a bolt (not shown) inserted in the other
holding hole (4d) (4d) into the bridge (2) etc. It is attached adjusting the angle.
As shown in FIG. 4, the sound collecting device (3) is attached to a horn-like introduction pipe (6)
which spreads forward and a throat portion (7) of the introduction pipe (6). A diaphragm (8) and
a condenser microphone (9) disposed behind the diaphragm (8) are provided.
The introduction pipe (6) is integrally formed with the substrate (13) provided so as to close the
rear end and the substrate (13), and an external horn (6a) expanding forward from there And an
intermediate horn (6b) which is disposed at the inner center of the outer horn (6a) and which is
slightly expanded backward and whose rear end is attached to the substrate (13) by bolts (22);
An internal horn (6c) disposed centrally on the inside of (6b), slightly diverging towards the
closed front end of the intermediate horn (6b), and attached to the substrate (13) As a result, a
meandered meandering horn is formed, which corresponds to a straight horn having a length
equal to the sum of the lengths of the respective horns.
The rear end of the inner horn (6c) is connected to the front center portion of the hemispherical
throat (7) which is integral with the substrate (13).
A forward hemispherical diaphragm (8) is disposed close to the rear surface of the throat portion
(7), and the peripheral portion of the diaphragm (8) is a pressure plate via a packing (10). (11)
and a mounting screw (12) are attached to the substrate (13).
At the rear end portion of the throat portion (7), a drain hole (21) facing downward is provided.
The substrate (13) is attached to the microphone attachment plate (23) by the bolt and nut (15)
through the packing (14).
A microphone (9) is attached to the central opening of the microphone attachment plate (23) via
a buffer holding member (24) such as rubber so as to face the diaphragm (8).
A closed space (25) is formed between the microphone (9) and the diaphragm (8).
The microphone (9) is enclosed by a sealed box (16) attached to the rear surface of the
microphone attachment plate (23) via a packing (14), and mounted in the box (16) A cable (18) is
connected to the amplifier (17).
The output of the amplifier (17) is taken out by the cable (20) inserted into the waterproof
penetration metal (19) provided on the bottom of the box (16).
The enclosed space (25) between the microphone (9) and the diaphragm (8) and the inside of the
box (16) are completely shut off from the outside world and waterproofed.
Although not shown, an antifreeze heater for cold regions is disposed as required behind the
diaphragm (8) and at other appropriate places.
The microphone (9) is not limited to the capacitor type, and may be, for example, a
semiconductor type or a piezoelectric type, depending on the required sensitivity and other
The outputs of the four sound collectors (3) mounted on the ship (1) are sent to a control unit
(not shown), and the directions of the other ship's steam lines are determined, and the directions
are determined on the inside of the ship. The sound is displayed on the display panel and
reproduced from the onboard speakers.
According to the first aspect of the present invention, the microphone is not exposed to the
outside directly, and the external sound is picked up through the closed space and the
diaphragm, so that the durability and waterproofness of the microphone can be avoided. It is
possible to use any kind of microphones, particularly high-performance condensers, and to
improve the sensitivity.
Further, unlike the prior art, it is not necessary to attach a voice coil to the diaphragm, so that the
diaphragm can be made lighter and sensitivity can be enhanced, and the whole apparatus can be
made lighter and smaller.
According to the second aspect of the present invention, high directivity and resonance effect can
be obtained, and moreover, the length of the horn can be shortened to miniaturize.
According to the third aspect of the present invention, it is possible to drain rainwater, waves and
the like coming into the introduction pipe from the outside, so that there is no hindrance to the
operation of the diaphragm.
According to the fourth aspect of the present invention, the microphone can be prevented from
picking up noise, and the microphone can be held securely.
According to the fifth aspect of the present invention, the protection of the microphone and its
amplifier is ensured, and sufficient durability and weather resistance to withstand the severe
conditions required for marine use are obtained. Can.
According to the sixth aspect of the present invention, the mounting angle in the vertical
direction of the sound collecting device can be easily adjusted.
According to the seventh aspect of the present invention, adjustment of the mounting angle in
the horizontal direction of the sound collector can be easily performed.
Brief description of the drawings
1 is a plan view schematically showing a ship provided with four sound collecting devices of the
present invention.
2 is a side view of an embodiment of the sound collection device of the present invention.
FIG. 3 is also a bottom view thereof.
Similarly FIG. 4 is an enlarged longitudinal side view thereof.
Explanation of sign
(1) ship (2) bridge (2a) mast (3) sound collector (4) base (4a) bottom plate (4b) side plate (4c)
mounting hole (4d) holding hole (5) pivot (6) introduction pipe (6a) external horn (6b) middle
horn (6c) internal horn (7) throat portion (8) diaphragm (9) microphone (10) packing (11)
pressure plate (12) mounting screw (13) substrate (14) Packing (15) bolt nut (16) box (17)
amplifier (18) cable (19) through metal (20) cable (21) drainage hole (22) bolt (23) microphone
mounting plate (24) holding member (25 ) Closed space