JPS5832395B2 - electric horn - Google Patents

Description

[Detailed Description of the Invention] So-called electric horns, which generate sound by vibrating a diaphragm using an electromagnet, usually include one electromagnet, and power is supplied to the electromagnet through the diaphragm. When the electromagnet is energized, the diaphragm is attracted to the diaphragm and the contact of the power supply circuit to the electromagnet is opened.

In such a device, in order to return the diaphragm to its original power supply state, a restoring spring must be provided separately to provide elastic restoring force to the diaphragm, or the elasticity of the diaphragm itself must be It is necessary to use this tendency to constantly deform the diaphragm in a direction away from the electromagnet.

Therefore, a significant portion of the electrical energy applied to the electromagnet is expended simply to displace the diaphragm against its elastic restoring force, and the remainder is simply converted into acoustic energy.

This means that in order to generate a certain level of sound,
This means that a more powerful electromagnet than is originally required is required, which increases the size and weight of the device, and requires a large current, which may shorten the life of the contact. There are drawbacks.

Especially on ships, sound generating equipment is installed as high as possible to improve sound transmission efficiency.
There is a strong desire to reduce the weight and size of the device.

The present invention effectively uses electrical energy to
The present invention relates to an electric horn that can generate powerful sound without significantly increasing the size and weight of the conventional horn, and with a relatively small current.Examples will be described below. The explanation will be based on the drawings shown.

A throat opening 2 is attached to the base of the trumpet 1.

The throat opening 2 has an outward flange 3 at its upper end, and a diaphragm 4 is fitted into a shallow circular recessed hole 3a attached to the center of the outward flange 3.

The periphery of the diaphragm 40 is pressed by the press ring 5,
The push ring 5 is fastened to the outward flange 3 by bolts 6.

On the push ring 5, there are three threaded supports 7, which are spaced approximately at equal intervals.
Triangular mounting plates 8 and 9 are fitted into the lower and upper ends of the support column 7, respectively.

The lower mounting plate 8 abuts the push ring 5 and is fastened by a nut 10 screwed onto the support column 7.

The upper mounting plate 9 has a nut 11 screwed onto the upper part of the support column 7.
, 11.

Fixed iron cores 12a and 13a of electromagnets 12 and 13 are fixed to the upper surface of the lower mounting plate 8 and the lower surface of the upper mounting plate 9 with bolts 14 and 15, respectively.

A slight gap is formed between both fixed cores 12a and 13a, and a rectangular plate-shaped movable core 16 is disposed within this gap with an appropriate gap.

Each fixed core 12a, 13a has a coil 12b.
, 13b are wrapped.

A connecting rod 17 is provided vertically from the center of the movable iron core 16, and the connecting rod 17 loosely fits into the center hole 12c of the fixed iron core 12a, and its lower end is properly fixed to the center of the diaphragm 4. ing.

The mutually opposing sides of the movable iron core 16 are connected to the leaf spring 1
8.18, it is connected to support rods 19, 19 which are erected from key points of the push ring 5.

The lower and upper surfaces of the center of the movable core 16 are connected to the fixed core l2 with auxiliary compression coil springs 20 and 21, respectively.
a, is elastically supported by 13a.

22 is a cover whose lower end outward flange 22a is fixed to the outward flange 3 with bolts 23.

A lug 16a is protruded from the center of the side of the movable core 16 that is orthogonal to the plate springs 18, 18.
A is provided with a movable contact 24 that projects upward and downward.

Upper and lower fixed contacts 26, 25 are disposed via support pieces 27 with a slight gap between them at locations facing both contacts 24, 24.

In addition, when the movable iron core 16 is not energized, a weak downward force is applied by the plate spring 18 and the coil springs 20 and 21, and the movable core 16 is in the lowered position, and the movable contact 24 contacts the fixed contact 25 below. It looks like this.

Thus, the lower fixed contact 25 is connected to the upper coil 13b, and the upper fixed contact 26 is connected to the lower coil 12b.
(See Figure 5).

In the electric horn of the present invention having the above configuration, for example, as shown in FIG. 5, after turning on the switch 28 and rectifying the AC power supply 29 with the rectifier circuit 30, both coils 12b are connected.

13b.

That is, first, the upper coil 13b is energized via the fixed contact 25, which is closed when not energized, and the movable core 16
is attracted and rises, and the movable contact 24 moves away from the fixed contact 25 and comes into contact with the fixed contact 26.

In this way, the movable iron core 16 repeats vertical movement at a constant period, and the diaphragm 4 is vibrated via the connecting rods 17 to generate sound.

The characteristics of the leaf spring 18 and the compression coil springs 20 and 21 are determined as required, and the natural frequency of the vibration system consisting of these and the diaphragm 4 is determined by the two coils 12b.

By matching or approximating the excitation frequency of 13b, the fundamental action can be promoted and the generated sound can be made into a dog sound.

Therefore, in the present invention, the elastic force applied to the movable core 16 is such that when the movable contact 24 is not energized, the fixed contacts 25 and 2
60. Because it only needs to be in extremely weak contact with either one of the magnets, a considerable portion of the electrical energy is not wasted as mechanical loss, unlike in the conventional single-electromagnetic type mentioned at the beginning. Since electrical energy is effectively converted into sound energy, high-level sound can be generated with a relatively small current, and the device can be made smaller and lighter.

Furthermore, by appropriately selecting the spring constant of the leaf spring 18 that supports the movable iron core 16, it is possible to generate sound at a desired frequency at the maximum level.

Furthermore, since the actuating portion is shielded by the diaphragm 4 and the cover 22, the acoustic energy is effectively radiated toward the trumpet 1 and is effective.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing one embodiment of the present invention, FIG. 2 is an enlarged vertical sectional view taken along the line A-A in FIG. 1, and FIG.
The figure is a longitudinal sectional view taken along line B-B in Figure 2, and Figure 4 is a
The cross-sectional view taken along the line C--C in FIG. 3 and FIG. 5 are diagrams showing -f0 of the electric circuit. 1...Trumpet, 2...Mouth, 3...
...Outward flange, 3a... Recessed hole, 4...
...Diaphragm, 5...Press ring, 6...
Bolt, 7... Support, 8, 9... Mounting plate, 10.11... Nut, 12, 13...
... Electromagnet, 12 a, 13 a = Fixed iron core, 1
2b, 13b-...Coil, 12c...
...Center hole, 14, 15...Bolt, 16...
...Movable iron core, 16a...Ear piece, 17...
...Running rod, 18...Plate spring, 19...
... Support rod, 20°21 ... Coil spring, 22.
...Cover, 23...Bolt, 24...
...Movable contact, 25,26...Fixed contact,
27...branch, 28...switch,...
...Power supply, 30... Rectifier circuit. 29...

Claims (1)

[Claims] 1. A sound-generating diaphragm is disposed so as to cover the base of the trumpet, and the center of the diaphragm is connected to a movable iron core held through appropriate elastic means with a link, Electromagnets are provided on the front and rear sides of the movable core, and multiple contact points are provided on a portion of each front and rear surface of the movable core, and a slight gap is provided between the movable contacts and the front and rear sides of the movable core. By providing a fixed contact connected to the coil of each of the electromagnets and urging the movable core in a certain direction using the elastic means, when the electromagnet is not energized,
The movable contact is in contact with one of the fixed contacts, and when the electromagnet is energized, the movable iron core is alternately attracted to different electromagnets, thereby vibrating the diaphragm via the movable iron core. An electric horn.