JPS59144297A - Electroacoustic transducer - Google Patents

Abstract

PURPOSE:To obtain waterproofing performance above the waterproofing level of waterproof cloth by providing an air chamber between the waterproof cloth and porous member arranged outside of them. CONSTITUTION:Waterproof cloths 15 and 20 are adhered to a part where a hole such as a sound radiation hole 3 and an air hole 4 are formed in a case 1 which contains a structure body for an electroacoustic transducing. Porous members such as wire netting 17 and a screen 16 are arranged outside of the waterproof cloths 15 and 20 and the air chambers 14 and 18 are formed between the porous members 16 and 17 and waterproof cloths 15 and 20. Consequently, the waterproofing performance is held above the waterproofing level of the used waterproof cloths without deteriorating sound quality.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electroacoustic transducer for headphones, speakers, etc. that is waterproofed.

Background technology and its problems Will water get into the case where the diaphragm etc. are placed as in the past? Waterproof headphones are known that are designed to prevent

Conventional waterproof headphones simply have a waterproof fabric layered over the sound emitting hole of the case, so the waterproof ability is determined by the water resistance level of the waterproof fabric. As a waterproof fabric, if you increase the water resistance level, the eyes will become clogged and the sound output characteristics will deteriorate, resulting in poor sound quality. It will make things worse. So, conventionally, what was the balance between sound emission characteristics and waterproof ability? Taking this into consideration, a waterproof fabric with a water resistance level of, for example, 20 cx (withstands water pressure at a depth of 20!) is used. Therefore, in that case, it is not possible to obtain a waterproof ability of 20 cm or more.

OBJECTS OF THE INVENTION The present invention provides a waterproof electroacoustic transducer having substantially all of the waterproof capabilities exceeding the waterproof level of waterproof fabric.

Summary of the Invention A waterproof cloth is fully adhered to the part of the case in which the structure for electroacoustic conversion is housed, where openings such as sound emission holes, ventilation holes, etc. are formed, and a wire mesh is attached to the outside of the waterproof cloth. The main feature is that a porous member such as a screen is arranged to form a nitrogen chamber between the porous member and the waterproof cloth.

As a result, the waterproof performance can be made to be higher than the water resistance level of the waterproof cloth used without deteriorating the sound quality.

Embodiment FIG. 1 shows an embodiment in which the present invention is applied to all headphones.

This headphone expanded inner case (1) and outer case (2)
It consists of The inner case (1) is provided with a plurality of sound emitting holes (3) on the front side, a plurality of slit-shaped ventilation holes (4) on the side surface (1a), and an opening (1b) at the bottom. It is provided. Also, this inner case (1)
A storage chamber (5) inside stores electroacoustic transducers such as a diaphragm (6), a voice coil (7), a yoke (8), a plate (9), and a magnet (10). The yoke (8) is provided with a vent circle, and a resistor U made of nonwoven fabric or the like is adhered to the lower surface of the yoke (8). The outer case (2) has an opening (2a) formed in the front surface, a slit-shaped ventilation hole α-kun in the side surface (2b), and an opening (2C) in the lower part. Also,
The side surface (1a) of the inner case (1) and the outer case (2)
) and the side surface (2b) is formed with a gap to form an air chamber (14). A fully breathable waterproof fabric (151) is glued to the outside of the side surface (1a), and
A screen (LQ) is glued to the inside of b). Also, a wire mesh housing η is fitted into the opening (2a), and a gap is formed between this wire mesh ←η and the part where the sound emission hole (3) is provided. It is formed into an air chamber.On the inside of the wire mesh side, a breathable screen (1) is glued, and a sound emitting hole (3) is attached.
A waterproof cloth (20) is glued to the portion where the is provided.

A holder member (2I) is fitted into the lower opening (2C) of the outer case (2), and this holder member CI! 11K
A cord (c) is inserted through the holder member (21) and the tri bush (2), and a core wire led out from the tip of this cord (c). (24) (251 is yoke (8)
Terminal board (261K connected) provided on the bottom surface of the

Next, the effects of the above configuration will be explained.

If the headphones are placed in a normal condition, the storage compartment (5
) and air chamber (18 [41] The air pressure inside is 1 atm, which is balanced with the outside). Next, when these headphones are submerged in water to a certain depth, water enters the air chamber through the wire mesh (I7) and the screen aSV, and the air vent (13) and the screen (le 't-a) enter the air chamber I. When water enters the sudden air chamber (IIIJ (14)), the air that was previously in the entire air chamber (1 g) (14) VC is drained from the waterproof cloth wt.
t51 is pushed out into the storage chamber (5), and therefore the air in this storage chamber (5) is compressed and the atmospheric pressure becomes high. This increase in atmospheric pressure is the depth to which the headphones are submerged,
In other words, the size and size correspond to the water pressure, and the storage room (
5) The atmospheric pressure and external water pressure are balanced.

Due to the increased air pressure in the storage chamber (5), the waterproof fabric (20) (1!19) has a waterproof ability higher than its water resistance level. Therefore, the entire volume of the air chamber α barrel αa is If you design and put it in place, for example, a waterproof cloth with a water resistance level of 20cm0)
α5) Even when fully used, a water resistance level of 1 m or more can be achieved without deteriorating the sound quality. In addition, since the area of the wire mesh (17) and the ventilation hole (1:1) is sufficiently small, when water enters the air chamber HC14, the air will not be pushed out from the wire mesh aη and the ventilation hole (13). , the air is forced into the storage chamber (5).

In addition, when the headphones submerged in water are slowly pulled up, the water pressure gradually decreases, and the air in the storage chamber (5) is also gradually pushed back into the air chamber (18) (C14). Water in 141 is covered with wire mesh (17)
When the headphones are completely lifted out of the water, theoretically all of the water in the air chamber I has been drained out.

Is Figure 2 the invention? An example in which the present invention is applied to a speaker will be shown.

In the figure, the speaker (to) is attached to the panel board Gυ. Baffle plate 0υ opening (31a) KH1
Wire mesh (3), screen (to), numerous partition members (b)
, a waterproof cloth (to), a guard member (to), etc. are provided as shown. The partition member 04) is the screen 43
31 and the waterproof cloth G51, for example, in a 7-nornicum 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 making the total opening area of each air chamber G7 sufficiently small, the same effect as that of all the air chambers a8α in the case of Fig. 1 can be obtained. Waterproof ability Can be made more than the water resistance level of waterproof fabric C351.

Effects of the invention The waterproof ability can be made higher than the waterproof level of the waterproof cloth used without deteriorating the sound quality. Furthermore, when the case is submerged in water, the air pressure inside the case is always balanced with the water pressure, so when the case is lifted out of the water, most of the water in the air chamber can be expelled.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an embodiment of the present invention applied to headphones, and FIG. 2 is a side sectional view showing an embodiment of the invention applied to a speaker. In addition, in the symbols used in the drawings, (1)...
・・・・・・・・・Inner a case (3)・・・・・・・・・
...Sound hole (4) ...Vent hole (5) ...Storage room (6) ...
・・・・・・・・・Diaphragm (7)・・・・・・・・・Voice coil +8）・・・・・・・・・Yoke (9
)・・・・・・・・・Plate (10)・・・・
・・・・・・・・・Magnet＜taS・・・・・・・・・
・Air chamber (t51t2tj+... waterproof cloth αQ...
・・・・・・・・・Scree-7(17)・・・・・・
...It's a wire mesh. Agent Masaru Ueya Yoshio Tsuneko Shuno Sugiura

Claims (1)

[Claims] A waterproof cloth is fully adhered to the opening of the case in which the structure for electroacoustic conversion is housed, and a porous member is arranged on the outside of this waterproof cloth, and a porous member is placed between the porous member and the waterproof cloth. An electro-acoustic transducer featuring a full air chamber.