JPS6237270Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an electric horn that generates a large resonant sound by generating strong vibrations with a constant electric power.

(Prior Art) A so-called electric horn is known in which a single electromagnet is intermittently energized and its attractive force is used to vibrate a diaphragm to generate sound.

(Problems to be Solved by the Invention) In order to increase the sound generated by the conventional electric horn as described above, the electromagnet must be made larger or the amount of power supplied must be increased.

According to the former, the electric horn itself becomes large and heavy, and power consumption increases, and the latter has limitations in terms of sound quality and the like.

(Means for solving the problem) The present invention is capable of generating loud sound despite its small size and low power consumption, and also enables effective use of supplied power. The purpose of this invention is to provide an electric horn that supports a plate-shaped movable iron core with the inner ends of a plurality of leaf springs whose outer ends can be vertically displaced. A fixed iron core is placed on both sides of the central part of the movable iron core with a slight gap, and a connecting rod integrally hung from the center of the movable iron core is loosely fitted into the center hole of one of the fixed iron cores. , is achieved by an electric horn whose lower end is fixed to the center of a diaphragm provided at the throat of the rattle.

(Example) The figure shows an example in which the present invention is applied to a temperature compensated electric horn.

A throat opening 2 is attached to the base of the wrapper 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 cut in the center of the upper surface of the outward flange 3.

The slightly thick peripheral part of the diaphragm 4 is a push ring 5.
The push ring 5 is pressed against the outward flange 3 by bolts 6, and the push ring 5 is fastened to the outward flange 3 by bolts 6.

On the push ring 5, three threaded columns 7, 7, 7 are erected at approximately equal intervals, and at the lower and upper ends of each column 7 are triangular mounting plates 8, 9 with apical angles, respectively. A hole drilled in the part is fitted.

The top corner of the lower mounting plate 8 abuts the upper surface of the push ring 5 and is fastened to the push ring 5 by a nut 10 screwed onto the support 7.

The top corner of the upper mounting plate 9 is held by nuts 11, 11 screwed into the upper part of the support column 7.

Fixed iron cores 1 of electromagnets 12 and 13 are provided on the upper surface of the lower mounting plate 8 and the lower surface of the upper mounting plate 9, respectively.
2a and 13a are fixed with bolts 14 and 15.

A slight gap is formed between both fixed cores 12a and 13a, and within this gap, a rectangular plate-shaped movable core 1 is formed.
6 are arranged with a slight gap.

Coils 12b and 13b are wound around the center of each fixed core 12a and 13a, respectively.

A connecting rod 17 is integrally suspended 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 fixed to the center of the diaphragm 4. ing.

The inner ends of leaf springs 18, 18 are fixed to the upper and lower surfaces of the mutually opposing sides of the movable core 16, and the inner ends of the leaf springs 18, 18 are sandwiched between the outer ends of the leaf springs 18, 18.
The protruding portion of the branch piece 32 is attached to the upper and lower nuts 33, 33 on the supporting rods 19, 19, which are provided upright from key points of the push ring 5.
They are connected so that they can be adjusted up and down.

The lower and upper surfaces of the center of the movable core 16 have auxiliary compression coil springs 20 and 21, respectively.
It is elastically supported at the center of fixed cores 12a and 13a.

22 is a cover, the lower end of which has an outward flange 22a;
is fixed to the outward flange 3 with bolts 23.

A thermistor 24 for detecting ambient temperature is fixed at a proper location on the wrapper 1. This thermistor 24
is connected to the pulse oscillator 25, and its operation will be described later.

The electric horn of the present invention having the above-mentioned configuration is, for example, a fifth
It is activated by alternately energizing the coils 12b and 13b by thyristor drive rotation as shown in the figure.

That is, turn on the power switch 26 and turn on the coil 1.
2b, 13b are connected to a DC power supply 27 via thyristors 28, 29 and a pulse oscillator 25,
A pulse oscillator 25 is used to oscillate a rectangular wave pulse corresponding to the sound to be generated.

As a result, the gates 28a and 29a of each thyristor 28 and 29 are triggered, but since one thyristor gate 29a is triggered via the inverter 30, the conduction phase is different from that of the other thyristor gate 28a. Become something to do.

The anodes of the thyristors 28, 29 are connected to a commutation capacitor 31 so as to cut off the conductive thyristor.

Therefore, the coils 12b, 1 connected to the power supply 27 via the thyristors 28, 29, respectively.
3b is alternately energized and deenergized at predetermined time intervals, alternately adsorbs and detaches the movable core 16, vibrates the diaphragm 4 up and down via the connecting rod 17, and generates a desired frequency. can generate a sound with a

The pulse oscillator 25 is linked to the thermistor 24, and the frequency of the generated pulses changes depending on the ambient temperature.

That is, when the ambient temperature is high, the number of generated pulses is small, the frequency of vibration of the diaphragm 4 is low, and the speed of sound is low, and when the ambient temperature is low, the opposite is true. Therefore, the wavelength of the generated sound can be kept almost constant regardless of temperature changes.

By determining the characteristics of the leaf spring 18 and the compression coil springs 20 and 21 as required, and further adjusting the nuts 33 and 33 as necessary to change the vertical position of the outer end of the leaf spring 18, each spring 18,
20, 21 and the diaphragm 4 to match or approximate the excitation frequency of both the coils 12b, 13b to increase the excitation effect and increase the generated sound. belongs to.

Furthermore, by appropriately positioning the outer part of the leaf spring 18 in the upper and lower positions, it is possible to generate sound at a desired frequency at the maximum level.

(Effects) As mentioned above, according to the present invention, it is possible to obtain approximately twice the frequency with the same electric power compared to the conventional single electromagnet type, and moreover, by selecting and adjusting the leaf springs, efficiency is improved. In addition to improving sound quality, it is also possible to change sound quality.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention, FIG. 2 is an enlarged vertical sectional view taken along line A-A in FIG. 1, and FIG. 3 is a line taken along B-B in FIG. A vertical cross-sectional view, FIG. 4 is a cross-sectional view taken along the line CC in FIG. 3, and FIG. 5 is a diagram showing an example of an electric circuit. 1... Ratsupa, 2... Throat, 3... Outward flange, 3a... Recessed hole, 4... Vibration plate, 5... Push ring, 6... Bolt, 7... Support, 8, 9... ...Mounting plate, 10, 11... Nut, 12, 13... Electromagnet, 12a, 13a... Fixed core, 12b, 13
b...Coil, 12c...Center hole, 14, 15...
...Bolt, 16...Movable iron core, 17...Connection rod, 1
8... Leaf spring, 19... Support rod, 20, 21... Coil spring, 22... Cover, 23... Bolt, 2
4... Thermistor, 25... Pulse oscillator, 26
...Power switch, 27...Power, 28, 29...
...thyristor, 28a, 29a...gate, 30
...Inverter, 31 ... Commutation capacitor, 32
...branch, 32...Natsuto.

Claims (1)

[Scope of utility model registration request] A plate-shaped movable core is supported by the inner ends of a plurality of leaf springs whose outer ends can be vertically displaced, and a fixed core is supported with a small gap on both sides of the center part of the movable core. At the same time, a connecting rod integrally hung from the center of the movable iron core is loosely fitted into the center hole of one of the fixed iron cores, and its lower end is connected to the center part of the diaphragm provided in the throat of the ratuppa. An electric horn that is fixed to the