JP2581037B2 - Waterproof earphones - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof earphone, and more particularly, to a waterproof earphone that reliably protects a diaphragm against water pressure from the front.

[Summary of the Invention] The present invention provides a waterproof earphone having a closed structure at least at the rear part of a diaphragm, and forming a communication part for air circulation in order to keep the pressure before and after the diaphragm constant. In this way, the diaphragm is prevented from being deformed or damaged.

[Conventional technology]

When the earphone is made to be a waterproof type, its housing may have a sealed structure. However, since the sound is transmitted by the vibration of air, at least a portion that emits the sound cannot have a closed structure, and an opening for emitting the sound is always required. Therefore, it is considered that the size of the opening for producing this sound is made small, and the size of the opening is such that water does not flow due to the surface tension of the water, thereby providing the earphone with waterproofness. In this case, when the pressure of the water column applied through the opening compresses the air in the earphone housing, the water repels the water so that the water only penetrates to a position where the water column and the air column are in equilibrium. It becomes possible to do.

[Problems to be solved by the invention]

However, when such a waterproof earphone is immersed in water, water enters the housing through an opening that emits sound, thereby compressing the front surface of the diaphragm of the drive unit and compressing the diaphragm. The pressure on the front increases. Then, a difference is generated between the air pressure on the front surface and the air pressure on the rear surface of the diaphragm, and the diaphragm is pushed rearward by the pressure difference. If such a pressure difference occurs suddenly, the diaphragm of the drive unit will be deformed or damaged.

The present invention has been made in view of such a problem, and is a waterproof type in which even if sudden pressure is applied, the diaphragm is reliably prevented from being deformed or damaged. It is intended to provide earphones.

[Means for solving the problem]

The present invention provides the earphone housing with a sealed structure,
In a waterproof earphone in which an opening for emitting sound is formed on the front surface of the diaphragm and a waterproof screen is arranged between the opening and the diaphragm, the size of the opening is such that water does not flow due to surface tension of water. And a communication part for communicating the space before and after the diaphragm, and an acoustic resistor for adjusting a frequency characteristic is arranged in the communication part. is there.

[Action]

Therefore, according to the present invention, the flow of the water from the opening is prevented by the surface tension of the water, and the intrusion of the water into the inside is prevented. Also, even when water pressure is applied from the outside through the opening that emits the sound of the earphone, the communicating portion can make the pressure before and after the diaphragm substantially equal, thereby preventing deformation and breakage of the diaphragm. Further, the frequency characteristic is adjusted by the acoustic resistor disposed in the communication section.

〔Example〕

Hereinafter, the present invention will be described with reference to one embodiment shown in the drawings. 3 and 4 show the entirety of an earphone according to an embodiment of the present invention. The earphone has a case 10 forming a housing, and a cap 11 is provided on the front side of the case 10. It is to be combined. A cylindrical portion 12 is integrally connected to the cap 11, and a locking projection 13 is formed on the outer peripheral portion on the distal end side of the cylindrical portion 12. The earplugs 14 are attached to the tubular portion 12 in a state where the earplugs 14 are locked by the protrusions 13. Ear wire
14 is formed of, for example, silicone rubber, and has a through hole 15 at the center thereof.
Is connected to the through hole. And earplugs
Bulk flange 16 formed on the outer periphery on the tip side of 14
Are engaged with the outer ear of the human ear.

A waterproof mesh 17 is provided inside the cylindrical portion 12 of the cap 11.
Is arranged. The waterproof mesh 17 is a net formed by knitting synthetic fibers, and is subjected to a water-repellent treatment. A drive unit 18 is provided inside the waterproof mesh 17, and the rear side thereof is supported by the case 10 via a register 19. Further, a cord 20 is drawn from the drive unit 18, and this cord 20 is inserted into the sleeve 23 of the plug 21. The plug 21 is made of rubber having elasticity, and closes the distal end of the draw-out tube portion 22 formed integrally with the case 10, whereby the draw-out portion of the cord 20 has a sealed structure. .

Next, the structure of the drive unit 18 will be described. As shown in FIG. 1, the drive unit 18 includes a frame 25 made of a magnetic material.
25 has a ring-shaped magnet 26 therein. A ring-shaped pole piece 27 is arranged at one end of the magnet 26. A bobbin 29 around which a voice coil 28 is wound is disposed between the outer peripheral surface of the pole piece 27 and the frame 25. The bobbin 29 is connected to the diaphragm 30. The outer peripheral side of the vibration plate 30 is fixed to the frame 25 via a holding ring 31. A protector 32 is disposed on the front side of the diaphragm 30 to protect the diaphragm 30. And protector
32 is located inside the waterproof mesh 17.

Furthermore, in this earphone, the drive unit 18
A communication groove 34 as shown in FIG. 1 and FIG. 2 is formed so as to communicate between the front and the rear of the diaphragm 30 even when pressure is externally applied. No differences are made. Further, an acoustic resistor 35 made of a nonwoven fabric for adjusting frequency characteristics is arranged in the communication groove 34.

In the above-described configuration, when a current flows through the voice coil 28 of the drive unit 18 through the core wire of the cord 20, the current interlinks with the magnetic flux generated by the magnet 26, whereby the voice coil 28 is connected to the axis of the drive unit 18. The directional force is received, and the diaphragm 30 is driven by the force to generate sound. The sound generated in this way comes out to the front side through the through hole of the tubular portion 12 and the through hole 15 of the earplug 14, and is transmitted to the ear.

Next, the waterproof structure of the waterproof earphone will be described. The case 10 itself is made of a synthetic resin molded body.
Since the distal end of the draw-out tube portion 22 is closed by the plug 21 and the sleeve 23 of the plug 21 is pressed against the cord 20, the back side of the drive unit 18 has a closed structure. Further, the cap 11 made of a synthetic resin molded body also has a closed structure, and the portion other than the opening of the cylindrical portion 12 has a closed structure.

Therefore, when this earphone is immersed in water, water penetrates through the through hole 15 of the earplug 14 as shown by an arrow 36. The water 36 compresses the air inside the through hole 15 of the earplug 14 and the inside of the tubular portion 12. That is, the water 36 flows through the through-hole 15 or the cylindrical portion until the water pressure balances with the pressure of the air inside the earphone.
12 will be invaded. In addition, the cylindrical part 12 and the through hole
15 is set to a size such that water does not flow due to the surface tension of water. Then, at the water pressure corresponding to the set waterproof performance, the water 36 only penetrates to a position that coincides with the waterproof mesh 17 as much as possible, and does not enter inside. Therefore, this makes it possible to prevent the water from entering the inside of the cases 10 and 11 and to protect the drive unit 18 from water to provide waterproofness.

When the earphones are immersed in water in this way, the water 36 flows through the through holes 15
Alternatively, the air enters the tubular portion 12 and the air inside is compressed. In this case, the space before and after the diaphragm 30 of the drive unit 18 is a communication groove shown in FIG. 1 and FIG.
Due to the communication by 34, mutual air flow is possible. Therefore, even if the water 36 enters from the outside and the pressure inside the housing rises, no pressure difference is generated between the front and rear of the diaphragm 30, and it is ensured that the diaphragm 30 is deformed or damaged. Will be prevented. Further, since the acoustic resistor 35 made of a nonwoven fabric is disposed in the communication hole 34 for eliminating the pressure difference, low-frequency degradation is reduced. By adjusting the resistance value of the acoustic resistor 35, it is possible to adjust the frequency characteristic, and thereby it is possible to increase the middle and high range and balance the sound.

[Application example]

Although the present invention has been described with reference to one embodiment shown in the drawings, the present invention is not limited to the above embodiment, and various modifications can be made based on the technical idea of the present invention. For example, in the above embodiment, one communication groove 34 is formed in the lower portion of the case 10, but a plurality of small communication grooves 34 may be formed along the circumferential direction. This communication hole 34
The frequency characteristics of the earphone can be adjusted by adjusting the size and the number of.

〔The invention's effect〕

As described above, the present invention is configured such that the sound-emitting opening on the front surface of the diaphragm is sized so that water does not flow due to the surface tension of the water, and furthermore, forms a communicating portion that communicates the space before and after the diaphragm, An acoustic resistor for adjusting the frequency characteristic is arranged in this communication part.

Therefore, according to such a configuration, even when immersed in water and subjected to water pressure, water is prevented from entering the inside through the opening that emits a sound due to the surface tension of the water. Further, even if water pressure is applied through this opening and the air on the front side of the diaphragm is compressed, the pressure difference can be eliminated by absorbing the pressure difference before and after the diaphragm by the communicating portion.
Therefore, from this, it is possible to reliably prevent the diaphragm from being deformed or damaged. In addition, since the acoustic resistor for adjusting the frequency characteristics is arranged in the communication portion, the frequency can be adjusted by such an acoustic resistor.

[Brief description of the drawings]

FIG. 1 is an enlarged longitudinal sectional view of a main part of a waterproof earphone according to one embodiment of the present invention, FIG. 2 is an enlarged sectional view showing a communication groove portion, and FIG. 3 is a longitudinal section showing the entire structure of the earphone. FIG. 4 is a front view of the same. In the reference numerals used in the drawings, 10: case 11: cap 12: tubular part 14: ear plug 15: through hole 17: waterproof mesh 18: drive unit 30: diaphragm 34: communication Groove 35: An acoustic resistor.

Claims (1)

(57) [Claims] 1. An earphone housing having a sealed structure,
In a waterproof earphone in which an opening for emitting sound is formed on the front surface of the diaphragm and a waterproof screen is arranged between the opening and the diaphragm, the size of the opening is such that water does not flow due to surface tension of water. A waterproof earphone, wherein a communication part for communicating a space before and after the diaphragm is formed, and an acoustic resistor for adjusting a frequency characteristic is arranged in the communication part.