JPH0726204Y2 - Ventilation structure of electric horn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an electric horn used in an automobile or the like.

(Prior Art) Generally, an electric horn is provided with a vent hole that allows the inside of the horn and the outside air to vent.

The ventilation hole formed by cutting and raising a part of the container is used when the horn is exposed to a relatively small amount of water.

If there is a lot of water on the horn, a vent with a bent pipe is effective.

By the way, in the electric horn provided with the ventilation hole which becomes these methods, in the above method, since the ventilation hole is also a drainage hole, this must always be provided at the lowest point. There is a problem that the attitude of the pipe on the atmosphere side is limited, which means that a dedicated horn must be prepared for each different mounting condition of the horn to the automobile.

In addition, as another conventional example, a container in which a small hole is provided and a porous film is provided in the small hole is proposed. This method is an effective ventilation structure in that the problems of the conventional example described above can be solved and the number of types of electric horns does not increase. However, since the water-repellent porous membrane is expensive and moreover it is easily broken due to its thin membrane, it is necessary to prevent it from being directly hit by pebbles or high-pressure water or from being exposed to muddy water. It is necessary to devise for that purpose, and there has been a problem that the conventional ventilation structure using a porous membrane is expensive. (Problems to be solved by the invention) In an electric horn having a drainage hole, the horn is a vent hole which is excellent in water resistance regardless of how the horn is exposed to water. It is an object of the present invention to provide a ventilation hole that does not affect the attachment state of the horn, that is, a ventilation structure that does not increase the number of types of horns.

It is another object of the present invention to provide an inexpensive ventilation structure in an electric horn that uses a porous film as a ventilation hole.

(Main stage for solving the problem) In order to solve the above problem, the present invention has the following configuration.

That is, a container that houses the electromagnetic coil and the interrupter, a diaphragm that covers the opening of the container to form a closed space and vibrates in response to the excitation of the electromagnetic coil, and a diaphragm that interlocks with the diaphragm and is installed in front of the diaphragm. In an electric flat horn composed of a resonant plate, a small hole is provided in the relevant portion of the diaphragm covered with the resonant plate,
It is characterized in that a porous film formed by combining with a non-woven fabric or the like is attached to the diaphragm so as to cover the small holes.

(Embodiment) Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

10 is an iron container with one opening, 12 is an electromagnetic coil,
A fixed iron core 14 is inserted in this center hole, and the electromagnetic coil 1
2. The fixed iron core 14 is fixed to the inner bottom of the container 10. Reference numeral 16 is an interrupter, which engages with a diaphragm described later and intermittently biases the electromagnetic coil 12. Reference numeral 18 denotes a vibrating plate, which covers one opening of the container 10 to form a closed space (inside the oven),
It vibrates in response to the excitation of the electromagnetic coil 12 and produces a sound. Reference numeral 20 denotes a disk-shaped resonance plate, and the resonance plate 20 which is a sound spreader is arranged in front of the reciprocating vibration surface of the vibration plate 18 so as to face the portion. The resonance plate 20 and the vibration plate 18 are fixed together by a movable iron core 22 facing the fixed iron core 14 so as to interlock with each other. 24 is a container
A terminal fixed to the outer surface of 10 supplies electric power to the electromagnetic coil 12, and 26 is a stay for mounting the horn body on an automobile. The above is the general structure of an electric horn which is generally classified as a flat type, and this horn having sharp directional characteristics is mounted so that the resonance plate 20 faces the front of the automobile.

Next, the ventilation structure of the present invention in the electric flat horn will be described. 30 is a small hole formed in the diaphragm 18,
Ventilate the inside of the horn and the outside air. The small hole 30 is provided in the diaphragm 18 at a portion facing the resonance plate, in other words, a portion covered with the resonance plate 20 and invisible when the horn is viewed from the front. Therefore, the small hole 30 is not exposed to water from the front and the rear of the horn. Even for water coming from the side or upside down of the horn, the small hole 30 is bored in the flat plate-shaped diaphragm 18 at a deep position in the narrow substantially parallel space formed by the diaphragm 18 and the resonator 20, so that the small hole 30 The probability of being exposed to water is extremely low. Further, the water droplets attached to the diaphragm 18 can be expected to be blown off by the vibration of the horn. Then 40
Is a porous film that covers the small holes 30. The porous membrane 40 made of a fluororesin, polyethylene, or ultra-high molecular weight polyethylene made porous has a selective permeability that allows a gas such as air to pass through but does not allow a liquid such as water having a large contact angle to pass through. Diaphragm
Since the porous film 40 covering the 18 small holes 30 is subjected to vibration and pressure change due to the blowing of the horn, it is used as a main reinforcement step in combination with a nonwoven fabric 42 or the like as shown in FIG. Reference numeral 44 in the figure is a double-sided adhesive.

The porous membrane 40 and the non-woven fabric or the woven fabric 42 are combined (bonded) to form a functional member, which is attached to a separator (not shown) with a double-sided adhesive and the member is used as a separator when used. It is peeled off and attached to the diaphragm 30.

Even if the porous membrane 40 is used in combination with the non-woven fabric 42 or the like, it will be damaged by high-pressure car wash water or pebbles. Therefore, the vibration plate 18 covered with the resonance plate 20 as described above is a good position as a use part of the horn of this member.

Further, since the porous film 42 is attached to the diaphragm 18, even if water or mud adheres to the porous film 42, the porous film 42 can be repelled by the vibration of the horn, that is, the vibration of the diaphragm 18. This is a characteristic effect obtained by attaching the porous film 42 to the diaphragm 18.

By the way, when the horn is mounted on an automobile, the position of the terminal 24 or the like is usually different for each vehicle.
Since the terminal 24 is fixed at a fixed position of the container 10, if a vent hole is provided in the container 10 as in the conventional case, many horns are required due to various restrictions such as the vent hole always having to be provided at the lowest point. It has become a kind as described above.

However, in the present invention, the ventilation hole is provided in the diaphragm 18, and the diaphragm 18 is also covered with the resonance plate 20 to form the small hole 30, and the porous film 40 is formed in the small hole 30. Since the structure is attached, even if the position of the terminal 24 etc. is different, there is no restriction as before.

(Effect of the Invention) The horn having the ventilation structure according to the present invention has a selective permeability that allows gas such as air to pass through but does not allow liquid such as water having a large contact angle to pass through. Can be used.

Further, even if the mounting position of the horn on the automobile is different, it is not necessary to newly set the vent hole position each time, and there is an effect that the types of the horn can be integrated.

In addition, the conventional ventilation structure using a porous membrane was expensive, but in the present invention, the porous membrane and the non-woven fabric are combined and attached to the diaphragm with a double-sided adhesive, so it can be provided at a low cost. There is an effect.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a horn according to the present invention,
FIG. 2 is an enlarged view of the main part. 10 ... container, 12 ... electromagnetic coil, 16 ... interrupter, 18 ... diaphragm,
20 ... Resonator, 30 ... Small hole, 40 ... Porous film

Claims (1)

[Scope of utility model registration request] 1. A container for accommodating an electromagnetic coil and an interrupter, a diaphragm for covering an opening of the container to form a closed space and vibrating in response to excitation of the electromagnetic coil, and a front surface of the diaphragm interlocked with the diaphragm. In an electric flat horn consisting of a resonance plate arranged in, a small hole is provided in the relevant part of the vibration plate covered with the resonance plate,
A ventilation structure for an electric horn, characterized in that a porous film formed by combining with a non-woven fabric or the like is attached to a diaphragm so as to cover the small holes.