JPH0728741Y2 - Waterproof radio - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a waterproof wireless device that solves various problems caused by distortion of a speaker cone generated by a pressure difference inside and outside a housing.

(Prior Art) Wireless devices, especially portable wireless devices, are often used outdoors, and it is necessary to protect electronic components inside the housing from intrusion of rainwater, so that a highly accurate watertight structure is required. It

That is, as shown in FIG. 2, the internal structure of the conventional waterproof wireless device is such that the wireless device housing 3 is watertightly sealed except for the grille front panel 2 on the front surface of the speaker 1 so that water droplets can enter from the outside. In addition, the cone portion 4 is covered with the speaker using the moisture resistant member such as mylar for the front panel 2 of the speaker grill.

According to this structure, even if water drops enter through the sound vent holes of the speaker grill 2, the moisture-resistant cone 4 can prevent the water from entering the inside of the wireless device housing.

The cone-shaped diaphragm 4 that constitutes the speaker is generally arranged so as to face the lattice-shaped speaker grill 2 formed in the housing, and water droplets that have penetrated from the sound vent holes 6 of the speaker grill 2 are received by the radio housing 3. In order to prevent the penetration into the inside of the casing, the expanded peripheral edge portion of the cone portion is watertightly bonded and fixed to the inner wall surface of the housing.

Therefore, the conventional wireless device has a configuration in which the inside and outside of the housing 3 are watertightly cut off with the cone surface of the speaker located inside the housing as a boundary.

However, the problem with such a conventional radio structure is that the free vibration of the speaker cone is suppressed due to the pressure difference between the external atmospheric pressure received by the cone outer surface and the internal atmospheric pressure received by the cone inner surface. That is, the speaker output sound is reduced. Further, when the temperature difference between the inside and the outside of the cone portion becomes a boundary, the speaker cone may be displaced either inside or outside due to the pressure difference and may not vibrate at all to obtain a voice output. Furthermore, when the speaker is used as a microphone, there is a problem in that the function of converting between sound waves and electric signals is lost, the modulated signal of the transmitter cannot be obtained, and the function of the communication device is not achieved.

(Purpose of the Invention) The present invention has been made in view of the above, and a diaphragm such as a cone portion that constitutes a speaker shuts the inside and outside of a housing in a watertight and airtight manner, so that An object of the present invention is to provide a waterproof wireless device which prevents the deflection of the diaphragm caused by the temperature difference and the deterioration of the speaker characteristics caused by the deflection.

(Outline of the Invention) In order to achieve the above object, the waterproof wireless device of the present invention has the following configuration.

That is, in a wireless device including a speaker having a diaphragm that watertightly and airtightly shields the inside and outside of the speaker unit case, a speaker chamber defined by the speaker diaphragm and the speaker unit case, The air vent hole formed in the wireless device housing is connected by a long and thin tube body so that water droplets do not enter the speaker chamber.

(Embodiment of the Invention) Hereinafter, a waterproof radio device of the present invention will be described in detail based on a preferred embodiment shown in the accompanying drawings.

FIG. 1 is an explanatory view of a configuration of a main part of one embodiment of the present invention,
Different from the above-mentioned conventional example in a structure in which a speaker using a vibration-proof member (cone) such as a mylar is watertightly pressure-bonded to the inner wall of the housing so that the inside of the case is isolated from the outside air by the speaker cone. However, the rear part of the speaker is covered with a case that hermetically shields the speaker part from the space inside the housing and secures a required space, and further, between the case, the wireless device and the required position of the housing wall. A characteristic is that the air is allowed to flow to the airtight space at the rear of the speaker by communicating with the tubular body.

This radio will be described in more detail with reference to FIG.
A speaker unit case 12 is integrated inside the speaker grill 11 of the housing 10. Inside the case 12, a cone-shaped and moisture-resistant unit, for example, a diaphragm 14 such as mylar or plastic is used. The speaker 15 is provided.

The outer peripheral edge portion 18a of the frame 18 of the speaker 15 is in close contact with the inner wall of the housing 10 so as to seal the inside and outside of the case 12 in a watertight and airtight manner. The required volume space defined by the diaphragm 14 and the speaker unit case 12 becomes the speaker chamber 16 and has a resonance amplification effect of the sound generated by the vibration of the cone.

On the other hand, an air vent hole 17 is formed in the upper wall of the case 12, and this portion is connected to an air vent hole 19 provided in the lower part of the housing 10 by a long pipe body (pipe line) 20.

Thus forming an airtight space in the rear part of the speaker and communicating with the outside of the housing through a tube having a hole with a small diameter, even if a pressure difference occurs between the rear part of the speaker and the outside,
Air can move through the thin tube to eliminate the pressure difference. Further, even if water droplets enter the above-mentioned thin tube, they do not reach the inside of the speaker case due to the capillary phenomenon and accumulate in the middle of the thin tube.

In order to ensure this effect, it would be preferable to make the length as long as possible, and the pipe diameter may be small.

With the above-described operation, the problem that the pressure applied to the speaker cone is removed and the speaker sound is reduced can be solved.

In this example, the formation position of the air vent hole 19 formed in the housing is the bottom surface of the housing where rainwater or the like is most unlikely to enter, but it may be formed in any other location.

In this way, the speaker room 16 in the speaker unit case 12
By making the tube and the outside of the housing communicate with each other by the tubular body 20, it is possible to eliminate the variation in the speaker characteristics due to the pressure difference between the inside and outside of the diaphragm 14.

(Effect of the Invention) As described above, according to the present invention, the diaphragm such as the cone portion that constitutes the speaker shuts the inside and the outside of the speaker unit case in a watertight and airtight manner.
It is possible to prevent the deflection of the diaphragm caused by the temperature difference or the like and the deterioration of the speaker characteristics caused by the deflection.

[Brief description of drawings]

FIG. 1 is an explanatory view of the configuration of an embodiment of the present invention, and FIG. 2 is an explanatory view of a conventional example. 10 ... Housing, 11 ... Speaker grill, 12 ... Speaker unit case, 14 ... Diaphragm, 15 ... Speaker, 16 ... Speaker room,
17 ... air vent hole, 19 ... air vent hole 20 ... long pipe (pipe)

Claims (1)

[Scope of utility model registration request] 1. A wireless device including a speaker having a diaphragm that shields the inside and outside of a speaker unit case in a watertight and airtight manner. A speaker defined by the diaphragm of the speaker and the speaker unit case. A watertight radio device characterized in that a chamber and a vent hole formed in the radio housing are connected by a long and thin hole pipe body so that water droplets do not enter the speaker chamber. .