JP2934282B2 - Horn type speaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a tweeter for reproducing mainly a high-frequency portion, in which a horn whose diameter increases toward the front end of a dome-shaped diaphragm is provided. The present invention relates to an improvement of a horn type speaker used as an electronic device.

[Conventional technology]

FIG. 4 shows an example of this type of conventional horn type speaker.

In the figure, reference numeral 1 denotes a dome-shaped diaphragm called a diaphragm, to which a voice coil 2 is attached. The voice coil 2 is separated from a center pole 3, a magnet 6, and a plate 7 provided on the magnet. The voice coil 2 is driven by being positioned in the magnetic gap 8 of the
It is supported via an edge 4. The diaphragm 1 is vibrated.

On the front surface of the diaphragm 1, a horn 5 whose opening has the same shape as the diaphragm 1 and whose diameter increases toward the front end.
Is installed, and the directivity and the sound pressure frequency characteristics are improved by diffusing the sound wave generated by the vibration of the diaphragm 1.

Since the planar shape of the diaphragm 1 is circular, the opening of the horn 5, that is, the shape of the throat portion 5a is also circular.

[Problem to be Solved by the Invention] In such a horn type speaker, in order to improve the directivity and the sound pressure frequency characteristics, in particular, to obtain a large horn effect and a high output sound pressure level, FIG. As described above, by making the diameter of the throat portion 5a of the horn 5 equal to or smaller than the diameter of the diaphragm 1, that is, by making at least the diameter of the throat portion 5a smaller than the outer periphery of the edge 4, The throat portion 5a is overlapped on the vibrating portion including the diaphragm 1 and the edge 4. That is, the sound pressure can be increased by reducing the area of the throat portion from which the sound wave is actually emitted to the area of the vibrating portion that emits the sound wave by overlapping the throat portion with the vibration portion.

Then, since the sound wave is generated from the entire surface of the diaphragm 1 and the edge 4, for example, as shown in FIG. 6, the sound wave A emitted from near the center of the diaphragm 1 and the sound wave emitted from the edge and the peripheral portion of the diaphragm 1. In B, the throat portions overlap, in particular, a difference occurs in the length of the path. If the path difference becomes a half wavelength, a sound wave emitted from the edge 4 and the peripheral portion of the diaphragm 1 may cancel out a sound wave emitted from the vicinity of the center.

The frequency at which the path difference becomes a half wavelength is not a relatively low frequency, but a high frequency, and since the shape of the throat portion 5a and the shape of the diaphragm 1 are the same, an acoustic wave from the vicinity of the center of the diaphragm is obtained. A portion that generates a sound wave having a condition that the path difference is a half wavelength exists near the edge of the diaphragm 1 or over the entire circumference of the edge 4.

With respect to the sound pressure frequency characteristic a when the diameter of the throat portion 5a shown in FIG. 7A is larger than the diameter of the diaphragm 1, the shape of the throat portion 5a is the same as the shape of the diaphragm 1, In addition, when the aperture is smaller than at least the aperture of the edge 4, there is a disadvantage that the sound pressure frequency characteristic in a high sound range is significantly reduced as shown in FIG.

However, when the value obtained by dividing the area of the diaphragm 1 by the opening area of the throat portion 5a is 0.7 or less, as shown in FIG.
This problem does not occur, and if it exceeds 1.5, a complicated configuration such as an equalizer is required.

[Object of the invention]

The present invention not only solves the above-described problem of the conventional horn-type speaker by making the path difference between the central part and the peripheral part of the sound wave generated from the diaphragm different depending on the throat part. It is another object of the present invention to provide a horn-type loudspeaker in which a high-frequency reproduction limit frequency is further extended without using a complicated configuration such as an equalizer.

[Summary of the Invention]

The present invention relates to a horn-type loudspeaker for achieving the above-described object. A horn having a throat portion overlapping the vibrating portion is provided.

(Example of the invention)

An embodiment of the present invention will be described with reference to FIGS.

1 is a dome-shaped diaphragm called a diaphragm, 2 is its voice coil, 3 is a magnetic circuit, and 4 is an edge, which are not different from conventional ones.

Reference numeral 9 denotes a horn. The shape of the throat portion 9a is different from the shape of the vibrating portion 1 in which the planar shape of the vibrating portion 1 is circular, and is different from the shape of the rounded quadrangular and the non-vibrating plate 1. The sides of the polygon are configured to intersect near the center of the edge.

Therefore, a portion that generates a sound wave that causes a path difference as in the case where the opening shape of the throat portion 9a is the same as the planar shape of the diaphragm 1 is a portion where the throat portion 9a overlaps.

However, the distance from the center of the diaphragm 1 to each part of the throat 9a is different. As a result, the path difference between the sound wave near the center and the sound wave generated from the diaphragm on which the throat portion 9a overlaps differs for each part. Therefore, a portion that generates a sound wave having the same condition that a path difference becomes a half wavelength with respect to a sound wave generated from the vicinity of the center is reduced.

In other words, by reducing the portion that generates sound waves having a path difference that causes cancellation, the cancellation is
It does not act strongly at a certain frequency, and does not lower the extension of the treble by cutting off the treble early, and further extends the treble. Further, since the path difference of the sound wave from the vibrating portion where the throat portion overlaps is different for each portion, an equalizing effect is produced.

As a result, in the horn type speaker of this embodiment,
As shown in FIG. 7C, the high frequency range of the sound pressure frequency characteristic is extended as compared with the conventional a and b.

In the above embodiment, the opening of the throat portion 9a of the horn 9 is a quadrilateral with rounded corners. The opening shape of the throat portion 9a is not limited to the elliptical shape shown in FIG. It may be a polygonal shape such as a shape, a non-equilateral polygonal shape, or the like.

Also, when the plane shape of the diaphragm is a shape other than a circle such as an ellipse, the opening shape of the throat portion is made circular, etc.
Various combinations are possible.

〔The invention's effect〕

As described above, according to the present invention, in order to improve directivity and sound pressure frequency characteristics, when a horn-shaped portion is provided on the front surface of the diaphragm, the throat portion is overlapped with the vibrating portion to obtain a large horn effect and output. It is possible to obtain a high sound pressure level and to prevent a sharp drop in sound pressure due to the cancellation of sound due to a difference in sound path, and particularly in a speaker for reproducing a high sound range, an equalizer is used. It does not require a complicated structure such as a device, and can increase the high-frequency reproduction limit frequency.Furthermore, it has an effect that an equalizing effect and the like can be obtained because the generated path difference is also different in each part. is there.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of one embodiment of the present invention, FIG. 2 is a sectional view thereof, FIG. 3 is a front view of another embodiment, and FIG. 4 is a conventional horn type speaker. FIG. 5 is a front view of an example of the relationship between the throat portion of the horn and the diaphragm, FIG. 6 is an explanatory diagram of the path difference of the sound waves, and FIG. 7 is the sound pressure frequency characteristics of these. FIG. 1 ... diaphragm, 2 ... voice coil, 3 ... center pole, 4 ... edge, 5 ... horn part, 5a ... throat part, 6 ... magnet, 7 ... plate, 8 ... magnetic gap , 9 ... horn part, 9a ... throat part.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shunichi Takahashi 4-2610 Hanazono, Tokorozawa-shi, Saitama Prefecture Pioneer Corporation Inside the Tokorozawa Plant (72) Inventor ▲ Eu ▼ Akira 4-2610 Hanazono, Tokorozawa-shi, Saitama Pioneer Corporation Tokorozawa Plant (72) The inventor Yuichi Saito 4-2610 Hanazono, Tokorozawa City, Saitama Prefecture Pioneer Corporation Tokorozawa Plant (56) References Real Open 1983-58 (JP, U) (58) Survey Field (Int.Cl. ⁶ , DB name) H04R 1/30

Claims (1)

(57) [Claims] 1. A horn having a throat portion having a shape different from that of a vibrating portion including an edge of the dome-shaped vibrating plate and having a part of the shape overlapping the vibrating portion is provided on a front surface of the dome-shaped diaphragm. A horn-type speaker.