JPS5926717Y2 - coaxial speaker system - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a coaxial speaker system in which a treble speaker and a bass speaker are arranged substantially coaxially.

In commonly used speaker devices, it is difficult to reproduce the necessary reproduction band with a single speaker unit, so it is possible to divide the reproduction band into several small areas and use a dedicated speaker for each band. It will be done.

Usually, the band is divided into two or three.

A so-called 2-way or 3-way speaker device is typical.

For simplicity, the explanation will be given below using a two-way speaker as an example.

Speakers that reproduce bass and treble ranges are called bass speakers and treble speakers.

In some speaker devices, these two speakers are arranged at different positions on the baffle surface, and in others they are arranged on the same axis.

The latter is called a coaxial speaker system and is distinguished from the former.

A feature of coaxial speakers is that since the two speakers are on the same axis, the sound image is not dispersed and has good localization.

The biggest drawback of this speaker is that since the bass speaker and treble speaker are very close to each other, the sounds reproduced by each speaker interfere with each other, causing cross-tuning distortion.

FIG. 1 shows an example of a conventionally used coaxial speaker system.

1 is a treble speaker, 2 is a bass speaker, and 3 is a cabinet.

Reference numeral 11 indicates direct sound from the high-pitched speaker, and reference numeral 12 indicates indirect sound that reaches the front direction after the sound from the high-pitched speaker is reflected by the low-pitched speaker.

When the diaphragm of the bass speaker vibrates, the indirect sound 12 becomes a sound containing cross-modulation distortion, which hinders good reproduction.

In order to reduce this cross-modulation distorted sound, it is necessary to reduce the amount of sound radiated from the treble speaker reaching the diaphragm of the bass speaker.

This invention aims to eliminate the above-mentioned conventional drawbacks.

FIG. 2 shows an example of a front stage according to this invention, in which an acoustic filter 4 is disposed surrounding the opening of the bass speaker 1.

The acoustic filter 4 is made of punched metal and has low-pass characteristics with low passing loss for low frequencies and small passing loss for high frequencies.

With the above configuration, the indirect sound 12 passes through the acoustic filter 4 by 2
As a result, the attenuation in the treble range becomes significantly large, and the cross-modulation distortion due to the diaphragm of the bass speaker 2 can be minimized, and the acoustic filter 4 facing the bass diaphragm
Since it is made of punched metal, it has sufficient mechanical strength to prevent vibration at low frequencies, and can also prevent distortion in the low frequency range.

Further, FIG. 3 shows an embodiment of the present invention in which the coaxial speaker system is made smaller.

As shown in the figure, a horn-shaped speaker is used for high-pitched sounds.
The opening end of the horn of this treble speaker is aligned with the opening end of the diaphragm of the bass speaker, and a low-pass acoustic filter 4 made of punched metal is provided in the horn section of the treble speaker, so that the sound Filter 4 itself has the role of a horn.

The component of the sound emitted from the high-pitched speaker that is modulated by the diaphragm of the low-pitched speaker is transmitted through an acoustic filter.
The attenuation is very large and intermodulation distortion is greatly reduced.

Furthermore, a part of the magnetic circuit of the bass speaker has a horn shape that is continuous with the horn of the treble speaker and plays the role of a horn, so the coaxial speaker system can be made thinner and more compact. You will be able to do this.

Note that the same effect can be obtained even if the acoustic filter itself is a horn of a high-frequency speaker.

As explained above, in a coaxial speaker system in which a horn-shaped treble speaker and an A-tone speaker are arranged on the same axis and housed in a cabinet, the open end of the horn section of the treble speaker and the bass The end of the opening of the diaphragm of the bass speaker is aligned with the opening end of the diaphragm, and a low-pass acoustic filter made of punched metal is installed in the horn section.A part of the magnetic circuit of the bass speaker is shaped into a horn that continues with the horn section. Therefore, the acoustic filter, which has sufficient mechanical strength, can also serve as a horn, making it possible to minimize undesired cross-modulation distortion, and making it possible to downsize the system itself.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional speaker system, and FIGS. 2 and 3 are sectional views showing embodiments of the speaker system according to the present invention. In the figure, 1 is a treble speaker, 2 is a bass speaker, and 4 is an acoustic filter. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] In a coaxial speaker system in which a horn-type treble speaker and a bass speaker are arranged on the same axis and housed in a cabinet, an opening end of the horn portion of the treble speaker and an opening end of the diaphragm of the bass speaker. , a low-pass acoustic filter made of punched metal is provided in the horn section, and a part of the magnetic circuit of the bass speaker has a horn shape that is continuous with the horn section. speaker system.