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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electro-acoustic transducer such as waterproofed headphones and speakers. Background art and
its problems Is water intruding into the case where the diaphragm, etc. are arranged
conventionally? There are known waterproof headphones that are designed to prevent it. Since
the conventional waterproof headphones are simply covered with a waterproof cloth, the
waterproof performance is determined by the water resistance level of the waterproof cloth. As a
waterproof cloth, if the water resistance level is raised to a high level, the clogging will occur and
the sound emission characteristics will deteriorate, the sound quality? It will be worse. So,
conventionally, is the combination of sound emission characteristics and waterproof ability?
Considering the water resistance level is eg 20 cx (water depth 20! Water resistant cloth) is used.
Therefore, as waterproofing ability in that case, the ability of water resistance level 20 cm or
more can not be obtained. OBJECTS OF THE INVENTION The present invention is to provide all
such waterproof electroacoustic transducers which have substantially all of the waterproofing
ability of waterproof cloth or higher. SUMMARY OF THE INVENTION A waterproof cloth is
entirely adhered to a portion where an opening is formed, such as a sound output hole, a vent,
etc. of a case in which a structure for electroacoustic conversion is housed, and a wire mesh is
provided on the outside of the waterproof cloth. A porous member such as a screen is disposed
to form a nitrogen-containing chamber between the porous member and the waterproof cloth. As
a result, it is possible to make the waterproof capacity and the water resistance level of the
waterproof cloth to be used without deteriorating the sound quality. Embodiment 1 FIG. 1 shows
an embodiment of the present invention applied to all headphones. This headphone expansion
case (1) and the outer case (2) are formed. The inner case (1) is provided with a plurality of
sound emission holes (3) on the front surface, a plurality of slit-like vent holes (4) formed on the
side surface (1a), and an opening (1b) in the lower part It is provided. In the storage chamber (5)
inside the inner case (1), an electroacoustic transducer such as a diaphragm (6), a voice coil (7), a
yoke (8), a plate (9) and a magnet (10) Is stored. The yoke (8) is provided with an air vent weir
and a resistor U made of non-woven fabric or the like is bonded to the lower surface thereof. In
the outer case (2), an opening (2a) is formed on the front surface, a slit-like vent ? is provided
on the side surface (2b), and an opening (2C) is provided on the lower portion. Further, a gap is
formed between the side surface (1a) of the inner case (1) and the side surface (2b) of the outer
case (2) to form an air chamber (14).
A waterproof cloth 151 having air permeability is adhered to the outside of the side surface (1a),
and a screen (LQ) is adhered to the inside of the side surface (2b). Further, a wire mesh housing
? ? is fitted in the opening (2a), and a gap is formed between the wire mesh ?? and a portion
where the sound release hole (3) is provided, thereby forming an air chamber. On the inner side
of the wire mesh side, a screen having air-permeable weirs (one edge is adhered, and a
waterproof cloth (20) is adhered to the portion provided with the sound release hole (3). A holder
member (2I) is fitted in the lower opening (2C) of the outer case (2), and this holder member CI!
11 K tri butts (two are inserted. And these holder members (21) and bushes (2 cords (2) are
inserted), core wire (24) (251) drawn from the tip of this cord (3), of yoke (8) A terminal plate
(261 K connected) provided on the lower surface. Next, the effect by the said structure is
demonstrated. If the headphones are placed in a normal state, the storage room (5) and the air
room (18 [41, the pressure inside the air is 1 atmosphere and the outside is in balance with each
other). Next, when the headphones are submerged in water to a certain depth, water infiltrates
through the wire mesh (I7) and the screen aSV at the time of the air chamber, and the ventilating
chamber I is ventilated with the air holes (13) and the screen (le't-a Water invades. When water
intrudes into the ventilating chamber (IIIJ (14), the air that has been used up to that point is
ventilated into the storage chamber (5) throughout the waterproof cloth wtt 51. The air in the
storage chamber (5) is compressed to increase the air pressure. The increase in air pressure is
equal to the submerged water depth of the headphones, that is, the size according to the water
pressure, whereby the air pressure in the storage room (5) and the external water pressure are
balanced. Because the air pressure in the storage room (5) is high, the waterproof cloth (20) (1!
The 19 will have a waterproofing ability above its water resistance level. Therefore, if the volume
of the air chamber ? barrel ?a is designed and placed, for example, waterproofing of water
resistance level 20 cm 0) ? 5) even if it is used at all It can be obtained without. In addition,
since the wire mesh (17) and the air vents (the area of 1: 1 is sufficiently small, air chamber
HC14) K, when water enters, air is not pushed out from the wire mesh a eta and the air vents
(13) to the outside , Air is pushed into the storage room (5). Also, when the headphones sunk in
the water are slowly pulled up, the water pressure gradually drops, so the air in the storage room
(5) is also gradually pushed back into the air room (18) C14. The water in 141 is drained to the
outside from the wire mesh (17) and the vent opening, and when the headphones are completely
pulled up from the water, theoretically all the water in the air chamber bet I is drained. There is.
Figure 2 is the present invention? The example at the time of applying to a speaker is shown. In
the figure, the speaker is attached to the pan plate G?. An opening (31a) of the baffle plate 0 is
provided with a KH1 wire mesh (3 mesh, screen), a large number of partition members (ii), a
waterproof cloth (soli), a guard member (mol) and the like as illustrated. The partition member
04) is provided between the screen 4331 and the waterproof cloth G51 with, for example, a 7
non-unicam structure, thereby forming a large number of air chambers t37). According to the
above configuration, even if the speaker has a large opening area, by setting the entire opening
area of each air chamber G7 sufficiently small, the same function as the total air chamber a8? in
the case of FIG. , Waterproof capacity ? waterproof cloth C351 can be more than the water
resistance level. Effect of the Invention The waterproofing ability can be made to be the ability
more than the water resistance level of the waterproofing cloth used without deteriorating the
sound quality. Also, when submersed in water, the pressure inside the case always balances
equally with the water pressure, so when pulled out from water, it is possible to almost drain the
water in the air chamber.
Brief description of the drawings
FIG. 1 is a side sectional view showing an embodiment of the present invention when applied to a
headphone, and FIG. 2 is a side sectional view showing an embodiment of the present invention
applied to a speaker.
Note in the code used in the drawings, (1) ............ within a casing (3) .............. sound output holes
(4) ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Diaphragm (7) ииииииии River и voice coil + 8)
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииии ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии ? 7 (17)...
Agent Katsuya Katsuhiro Toshio Bagei Toshihiro Sugiura
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