JPH04329800A - Horn type driver - Google Patents

Abstract

PURPOSE:To improve power resistance and to attain a wide range for a reproduction band by providing two independent magnetic circuits to a front and a rear side of a diaphragm respectively and arranging a voice coil in the magnetic circuits respectively. CONSTITUTION:A diaphragm 17 is fitted to a plate 14 of a front radiation type horn driver 10, a voice coil 19 is adhered to a rear side of the diaphragm 17, the coil 19 is inserted between a center pole 13 and the plate 14 forming a magnetic circuit. Furthermore, other voice coil 19' is adhered to a front side of the diaphragm 17 and the coil 19' is inserted between a center pole 13' and a plate 14' forming other magnetic circuit. When a signal is inputted to the coils 19,19', they act like a push-pull operation. The linearity is improved through the push-pull structure. Furthermore, the two magnetic circuit is magnetized in the same polarity thereby increasing the magnetic flux density of the gap.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horn driver as a unit for driving a horn speaker.

0002

2. Description of the Related Art For example, a horn-type driver has been put into practical use as an electrodynamic speaker driving unit. The front emission type will be explained in detail with reference to FIG. 3, and the rear emission type will be explained in detail with reference to FIG. 4.

In FIG. 3, reference numeral 10 denotes a front-emission type horn-shaped driver. This horn type driver 10
A magnetic circuit is constituted by an iron yoke 11, a magnet (permanent magnet) 12, a center pole 13, and a plate 14, and a uniform DC magnetic field is created. A diaphragm 17 is interposed between the plate 14 and the throat 15 via a rubber packing 16. This diaphragm 17 is located within the throat 15 between the center pole 13 and an equalizer (phase equalizer) 18. A voice coil (moving coil) 19 is bonded to the rear surface of the diaphragm 17 with adhesive. This voice coil 19 is inserted between the center pole 13 and the plate 14 that constitute the magnetic circuit, and an AC voltage (signal) is applied to this voice coil 19 to vibrate the diaphragm 17 according to Fleming's left hand rule. It is designed to let you do so. Further, the equalizer 18 functions to equalize the phase difference between the sound waves emitted from the center of the diaphragm 17 and the phases of the sound waves emitted from the periphery. In FIG. 3, reference numeral 13a is a ball guide, and reference numeral 15a is a threaded portion for connecting a horn (not shown).

In FIG. 4, reference numeral 20 is a rear-emitting type horn-shaped driver. This horn type driver 20
A magnetic circuit is constituted by an iron yoke 21, a cylindrical magnet 22, a center pole 23, and a plate 24, and a uniform DC magnetic field is created. A diaphragm 27 is interposed between the plate 24 and the diaphragm cover 27a with a rubber packing 26 interposed therebetween. This diaphragm 27 is located between an equalizer (phase equalizer) 28 provided within the center pole 23 and the diaphragm cover 27a. And this diaphragm 27
A voice coil 29 is glued to the rear surface of the holder. The voice coil 29 is inserted between the center pole 23 and the plate 24 constituting the magnetic circuit to vibrate the diaphragm 27. Note that the reference numeral 25 in FIG. 4 is a float, and the throat 25 is exposed from inside the cylindrical magnet 22 to the rear surface side of the yoke 21.

[0005]

However, in the conventional horn type drivers 10 and 20, the diaphragms 17 and 27
Voice coils 19, 2 provided only on one side of the rear surface
Since the diaphragms 17, 27 are vibrated in the voice coils 19, 29, there is a limit to the heat resistance of the voice coils 19, 29, and there is a problem in terms of power resistance. If a horn-type driver requires high output, the voice coil will inevitably have a large diameter, but if the voice coil has a large diameter, the frequency of the diaphragm will be lower, causing problems in high frequency reproduction. At the same time, the diameter of the diaphragm also increases, causing the problem that the strength of the diaphragm itself decreases. In addition, the above horn type driver 1
0 and 20, a high Bg (magnetic flux density) value is often structurally required, but since the yokes 11 and 21 of the magnetic circuit are easily magnetically saturated, the efficiency becomes extremely poor when the value exceeds a certain value. , a large magnet is required. In addition, with a flat plate or cone-shaped driver, there is a voice on the front and rear of the diaphragm.
There are models with individual coils attached, but in the case of direct radiation types such as flat plate or cone drivers,
There were many problems in terms of sound quality and characteristics, with the magnetic circuit on the front covering the diaphragm and the voice coil on the front getting in the way of the diaphragm's vibrations. Therefore, the present invention provides a horn-type driver that can obtain high output with a small-diameter voice coil.

[0006]

[Means for solving the problem] A voice coil that is placed in a magnetic circuit that creates a magnetic field and generates a force proportional to the sound current, and a diaphragm that transmits the vibrations of this voice coil to the air. In the horn type driver, two independent magnetic circuits are provided on the front and rear sides of the diaphragm, and a voice coil is disposed in each of these magnetic circuits.

[0007]

[Function] Two independent magnetic circuits are provided on the front and rear sides of the diaphragm, and a voice coil is placed inside each of these magnetic circuits, so the heat resistance of the voice coil is improved and the horn type driver Improves power resistance. Furthermore, by increasing the excitation force of the voice coil, the reproduction range of the horn-type driver can be widened.

[0008]

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Components that are the same as those of the conventional examples shown in FIGS. 3 and 4 will be described with the same reference numerals.

In FIG. 1, reference numeral 10 is a front-emitting type horn-shaped driver, and a magnetic circuit is constituted by an iron yoke 11, a magnet 12, a center pole 13, and a plate 14 to create a uniform DC magnetic field. The diaphragm 17 is attached to the plate 14 through a rubber packing 16, and the voice coil 19 is bonded to the rear surface of the diaphragm 17 with adhesive. 19 is inserted between the center pole 13 and plate 14 constituting the magnetic circuit, which is similar to the conventional structure.

Here, another independent magnetic circuit is provided on the front side of the voice coil 19 by an iron yoke 11', a cylindrical magnet 12', a substantially cylindrical center pole 13', and a plate 14'. is configured to create a uniform DC magnetic field. Also, this diaphragm 1
Another voice coil 19' is bonded with adhesive to the front surface of the magnetic circuit 7, and this voice coil 19' is inserted between the center pole 13' and the plate 14' that constitute the magnetic circuit. The diaphragm 17 is made to vibrate together with the voice coil 19. In FIG. 1, reference numeral 13a' is a ball guide, and reference numeral 15 is a throat exposed from inside the cylindrical magnet 12' to the front side of the yoke 11'.

According to the horn type driver 10 of the above embodiment, voice coils 19 and 1 are provided on the front and rear surfaces of the diaphragm 17.
9' are glued to each other, and each voice coil 19
, 19', each has an independent magnetic circuit. When a signal is input to each of these voice coils 19, 19', the voice coils 19, 19' are wired so that they move in the same direction, resulting in a push-pull operation. This push-pull structure can improve linearity. In addition, the two magnetic circuits at this time are magnetized with the same polarity, and the leakage magnetic flux from the gap repels each other, so as a result, the leakage magnetic flux decreases and the magnetic flux density of the gap increases. .

In this way, two independent magnetic circuits are provided on the front and rear surfaces of the diaphragm 17, which transmits the vibrations of the voice coil to the air, and the voice coils 19 and 19' are arranged in these magnetic circuits, respectively. Compared to a conventional driver with one voice coil, the heat generated in each voice coil 19, 19' is halved at the same power, so the heat resistance of the voice coil 19, 19' is improved. can be improved. Each voice coil 19
, 19', the high output (power resistance) of the driver 10 can be further improved. Furthermore, by providing the voice coils 19 and 19' on the front and rear surfaces of the diaphragm 17, it is possible to reduce the diameter of the voice coil and the size of the magnet, and the strength of the diaphragm 17 is also reduced. It is possible to improve the sound quality etc. without any problems. Furthermore, by increasing the excitation force of the voice coil, the reproduction band of the horn type driver 10 can be made even wider.

FIG. 2 shows another embodiment. In Figure 2,
20 is a rear-emitting type horn-shaped driver, and a magnetic circuit is constructed by an iron yoke 21, a cylindrical magnet 22, a center pole 23, and a plate 24 to create a uniform DC magnetic field. , the diaphragm 2 is attached to this plate 24 via a rubber packing 26.
7 is attached, there is a voice on the back of this diaphragm 27.
A coil 29 is bonded with adhesive, and the voice coil 29 is inserted between the center pole 23 and plate 24 that constitute the magnetic circuit, and the throat 25 is inserted from inside the cylindrical magnet 22. The point that the yoke 22 is exposed on the rear side is similar to the conventional structure.

Here, another independent magnetic circuit is provided on the front side of the voice coil 29 by an iron yoke 21', a cylindrical magnet 22', a substantially cylindrical center pole 23', and a plate 24'. is configured to create a uniform DC magnetic field. Also, this diaphragm 2
Another voice coil 29' is glued to the front surface of the magnetic circuit 7, and this voice coil 29' is inserted between the center pole 23' and the plate 24' which constitute the magnetic circuit. The diaphragm 27 is connected to the voice coil 2.
It is designed to vibrate along with 9. Thereby, the same operation and effect as in the embodiment described above can be achieved.

In each of the above embodiments, one voice coil was placed on the front and one on the rear side of the diaphragm. Two or more voice coils may be provided.

[0016]

[Effects of the Invention] As described above, according to the horn type driver of the present invention, two independent magnetic circuits are provided on the front and rear sides of the diaphragm that transmits the vibration of the voice coil to the air. By arranging voice coils inside each, the heat dissipation area of the voice coils can be increased and the power resistance of the horn type driver can be improved. Furthermore, by increasing the excitation force of the voice coil, it is possible to further widen the playback band of the horn type driver.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a front-emission type horn-shaped driver showing an embodiment of the present invention.

FIG. 2 is a sectional view of a rear-emitting type horn-shaped driver showing another embodiment of the present invention.

FIG. 3 is a sectional view of a conventional front-emission type horn driver.

FIG. 4 is a sectional view of another conventional rear-emitting horn driver.

[Explanation of symbols]

10, 20... Horn type driver, 17, 27... Vibration plate, 19, 19'... Voile coil, 29, 29'... Voile coil.

Claims (1)

[Claims] [Claim 1] A horn-shaped driver comprising a voice coil that is placed in a magnetic circuit that creates a magnetic field and generates a force proportional to a sound current, and a diaphragm that transmits the vibrations of the voice coil to the air. , a horn type driver characterized in that two independent magnetic circuits are provided on the front and rear sides of the diaphragm, and voice coils are arranged in each of these magnetic circuits.