JPS5912237B2 - coaxial speaker - Google Patents

Description

[Detailed description of the invention] The present invention relates to improvements in coaxial speakers.

Conventionally used coaxial speakers have a cone-shaped or horn-shaped treble speaker attached to the center of a cone-shaped bass speaker.

Coaxial speakers have the advantage that the bass speaker and the treble speaker are on the same axis, making the sense of sound direction and sound image clear.

However, with conventional coaxial speakers, the sound radiation from the treble speaker attached to the center of the cone-shaped bass speaker is reflected by the diaphragm and edges of the bass speaker, causing interference, mainly in the treble. Sound pressure of speakers for
Beef in frequency characteristics.

It was causing a dip.

Furthermore, the presence of the treble speaker as a protrusion in the center of the bass speaker itself has an adverse effect on the treble sound.

The coaxial speaker according to the present invention uses a ring-shaped flat plate diaphragm as a bass speaker, and arranges a treble speaker in the center of the bass speaker and closer to the back side of the ring-shaped flat plate diaphragm to produce high-pitched sounds. The purpose of this invention is to improve the characteristics of a low-pitched speaker and to eliminate the drawbacks of conventional coaxial speakers, such as increasing air escape from the back of the diaphragm of the low-pitched speaker.

A detailed explanation will be given below with reference to figures.

FIG. 1 is a sectional view of a conventional coaxial speaker.

In FIG. 1, 1 is a diaphragm of a cone-shaped bass speaker, 2 is a voice coil that drives the diaphragm 1, 3 is a magnetic circuit of the bass speaker, 4 is a support for the inner diameter of the cone-shaped diaphragm 1,
This is a support that fixes the edge 6 that serves as an air seal.

A frame 5 fixes an edge 7 that supports the outer circumference of the diaphragm 1.

A damper 8 is connected to the voice coil 2 and serves to increase the linearity of the vibration system of the diaphragm 1 edge 7 damper 6.

Reference numeral 9 denotes a treble speaker attached to the center of the cone-shaped bass speaker.

Conventional coaxial speakers configured in this way have a bass speaker and a treble speaker on the same axis, so the sense of direction and sound image of the sound are clear. It has advantages that separate composite speakers do not have.

However, in conventional coaxial speakers, since the treble speaker is located in the center of the cone-shaped bass speaker, the sound waves emitted from the treble speaker are reflected by the diaphragm and edges of the cone-shaped bass speaker. , which degraded the sound quality of high-frequency speakers.

Furthermore, since the treble speaker exists as a protrusion in the center of the bass speaker, it is not preferable.

Among conventional coaxial speakers, some have highly efficient horn-type speakers as high-frequency speakers, but these have very similar drawbacks.

FIG. 2 is a sectional view of a coaxial speaker including a bass speaker using a ring-shaped flat plate diaphragm and a cone-shaped treble speaker according to an embodiment of the present invention.

In the figure, 1 is a ring-shaped flat plate diaphragm of a bass speaker, 2 is a voice coil that drives the diaphragm 1, and 3 is a bass speaker with a circular hole-shaped opening 3 in the center for attaching a treble speaker 9. It is a magnetic circuit diagram.

As shown in the figure, the treble speaker 9 is located closer to the back surface than the diaphragm 1, and its front surface is substantially flush with the front surface of the bass speaker.

4 is connected to the inner diameter side of the ring-shaped flat plate diaphragm 1 and fixes an edge 6 that supports it, and a high-pitched speaker 9 that is a coaxial speaker.
The uke is a support that holds the body in place.

5 is a frame for fixing an edge 7 that is connected to the outer diameter of a ring-shaped flat plate diaphragm and supports this; 8 is a damper for increasing the linearity of the vibration system; 9 is formed at the tip of the frame of a high-pitched speaker 9; The stepped portion is fitted to the tip of the support column 4.

In one embodiment of the present invention configured in this way, a ring-shaped flat plate is used as the bass diaphragm, so the sound radiation from the treble speaker is reflected by the bass diaphragm, thereby changing the characteristics of the treble speaker. This not only solves the major drawbacks of conventional coaxial speakers, but also provides a bass speaker with even characteristics.

Furthermore, in this invention, since the treble speaker is inserted and mounted through the opening on the back side of the center part of the bass speaker, the treble speaker can use a magnetic circuit that is sufficiently larger than the diameter of the diaphragm. This makes it possible to realize an efficient high-temperature speaker.

Furthermore, the sound radiation from the back of the ring-shaped flat vibration plate used as a bass speaker is not only radiated from the outside of the conventional voice coil, but also from the support that fixes the edges of the treble speaker and bass speaker. Since the air can escape through the rear part of the magnetic circuit through the air vent hole, the sound quality is improved compared to conventional bass speakers.

FIG. 3a is a diagram showing an example of the sound pressure frequency characteristic of a coaxial speaker according to an embodiment of the present invention configured as described above;
FIG. 3 is a diagram showing the sound pressure frequency characteristics of an example of a conventional coaxial speaker.

Figures 3a and 3b show the characteristics of the bass speaker, and the mouth shows the characteristics of the treble speaker.

The bass speakers of the present invention and the conventional speakers both have a diameter of 30 crn, and the treble speakers of the present invention are cone-shaped and have a diameter of 5 crn! speaker,
The conventional one uses a 3σ horn shape.

The coaxial speaker of the present invention is a peak speaker. Less dip,
Excellent sound quality is also obtained.

As described above, the coaxial speaker of the present invention includes a bass speaker that has an opening near the center of the magnetic circuit section and a ring-shaped diaphragm, and a bass speaker that has an opening near the center of the magnetic circuit section and a flat ring-shaped diaphragm. Since it is equipped with a treble speaker located closer to the back side than the diaphragm of the bass speaker,
The sound waves emitted from the high-pitched speaker will not be reflected by the diaphragm of the low-temperature speaker, and the characteristics of the high-pitched speaker will not be disturbed. Obtainable.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional coaxial speaker, Fig. 2 is a sectional view of an embodiment of the coaxial speaker of the present invention, and Fig. 3 is a sectional view of the coaxial speaker of the embodiment of the present invention and an example of a conventional coaxial speaker. This is a comparison of sound pressure-frequency characteristics. In the figure, 1 is a diaphragm, 2 is a voice coil, 3 is a magnetic circuit section, 4 is a column, 5 is a frame, 6 is an edge, 7 is an edge,
8 is a damper, and 9 is a treble speaker. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A bass speaker having an opening near the center of the magnetic circuit section and a ring-shaped diaphragm, and a bass speaker arranged in the center of the bass speaker closer to the back side than the diaphragm of the bass speaker. A coaxial speaker equipped with a treble speaker and a treble speaker.