JPH0113278B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a composite planar speaker used in high-fidelity audio, car audio, and the like.

Conventional configurations and their problems Recently, in the audio world, various improvements have been made to enable better reproduction.

Composite planar speakers have been developed to meet these demands.

A representative example thereof will be explained using FIG. Reference numeral 1 denotes a low-pitched magnetic circuit, and the low-pitched magnetic circuit 1 is constructed of a ring-shaped magnet 4 on a plate 3 having a center pole 2, and a ring-shaped upper plate 5 as well. A frame 6 is coupled to this bass magnetic circuit 1. A recess 7 is provided on the upper surface of the center pole 2 of the bass magnetic circuit 1, and a treble magnetic circuit 8 is provided in the recess 7.
The treble magnetic circuit 8 is constructed by laminating a ring-shaped magnet 11 and a ring-shaped upper plate 12 on a plate 10 having a center pole 9.

A gasket 13 and a bass edge 14 are coupled to the peripheral edge of the frame 6, and a bass flat diaphragm 15 is coupled to the bass edge 14. A treble flat diaphragm 17 is disposed in the center of the bass flat diaphragm 15 with a treble edge 16 in between. A magnetic gap 1 of the bass magnetic circuit 1 is provided on the lower surface of the bass flat diaphragm 15.
A boil coil 19 that fits into the coil coil 8 is coupled to the coil coil 8, and the middle portion of the coil coil 19 is held by a damper 20.

A boil coil 22 that fits into the magnetic gap 21 of the high-pitched magnetic circuit 8 is coupled to the lower surface of the high-pitched flat diaphragm 17.

With this configuration, bass is produced by the bass flat diaphragm 15.
The treble is generated by driving the treble flat diaphragm 1.
7 is driven to generate the sound, and faithful reproduction is performed over the entire range.

In such a composite planar speaker, a conventional composite diaphragm was constructed as shown in FIG. That is, the low-pitched flat diaphragm 15 is ring-shaped, and a disk-shaped high-pitched flat diaphragm 17 is placed in the center of the low-pitched flat diaphragm 15, and the two diaphragms 15 and 17 are arranged so that they are not connected to each other. It is completely axially symmetrical, and the high-frequency sound waves generated by the high-pitched flat diaphragm 17 have an outer diameter D2φ of the high-pitched flat diaphragm 17.
At the peripheral edge of the bass flat diaphragm 15 having the outer diameter D1φ, the wavefront is acoustically disturbed, especially in the flat diaphragm, and for example, two wavelengths corresponding to D1φ and D2φ are
At twice the frequency, the wavefront is disturbed intensively, causing a large disturbance in the sound pressure frequency characteristics, which is a factor that inhibits high-fidelity playback.

Purpose of the Invention The present invention eliminates the above-mentioned conventional drawbacks, and provides a composite planar speaker that enables high frequency reproduction without disturbing sound pressure frequency characteristics even when a composite flat diaphragm is used. The purpose is to

Structure of the Invention In order to achieve the above object, the present invention provides a treble magnetic circuit on a bass magnetic circuit, and connects a bass flat plate diaphragm to a frame coupled to the bass magnetic circuit via a bass edge. A treble flat diaphragm is connected to the center of this bass flat diaphragm via a treble edge, and when the bass flat diaphragm is ring-shaped, the treble flat diaphragm is square shaped, and the bass When the flat diaphragm for treble is shaped like a rectangular frame, the flat diaphragm for treble is circular, the flat diaphragm for treble is equipped with a boiling coil that fits into the magnetic gap of the magnetic circuit for bass, and the flat diaphragm for treble is equipped with a boiling coil that fits into the magnetic gap of the magnetic circuit for treble. The boiler coils that fit into the magnetic gears of the magnetic circuit are connected to each other, and the distances in the radial and radial directions from the end of the high-pitched flat diaphragm to the peripheral edge of the low-pitched flat diaphragm are varied. This is to disperse wavefront disturbances such as reflections at the edges so that they do not adversely affect the characteristics.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to FIGS. 3 and 4 of the drawings.

The basic structure of the composite planar speaker is substantially the same as that explained using FIG. 1, and the composite planar diaphragm, which is a feature of the present invention, will be described here.

First, in the embodiment shown in FIG.
The outer circumferential shape of the diaphragm 14 is circular, so the bass edge 14 is also ring-shaped, and the bass flat diaphragm 15 is also ring-shaped, but a rectangular opening is provided in the center. A rectangular high-pitched flat diaphragm 17 is incorporated into the center of the low-pitched flat diaphragm 15 via a rectangular frame-shaped high-pitched edge 16.

Further, in the embodiment shown in FIG. 4, the shape of the outer periphery of the frame 6 is rectangular, and therefore the bass edge 14 is also square frame-shaped, and the bass flat plate diaphragm 1 is also shaped like a rectangular frame.
5 also has a rectangular frame shape, however, a circular opening is provided in the center thereof, and a circular treble flat plate diaphragm is inserted into the center of the low tone flat plate diaphragm 15 via a ring-shaped treble edge 16. A plate 17 is incorporated therein.

In both embodiments, the low-pitched flat diaphragm 15 and the high-pitched flat diaphragm 17 are arranged coaxially, but they are a combination of square and circular shapes, so the peripheral edge of the high-pitched flat diaphragm 17 is Since the distance in the radial direction and the radial direction to the peripheral edge of the bass flat diaphragm 15 is not constant, wavefront disturbances such as reflections at the peripheral edge are not limited to a specific frequency but are dispersed.

Effects of the Invention As described above, the composite planar speaker of the present invention has the following features:
As a composite flat plate diaphragm, the shapes of the flat plate diaphragms for bass and treble are a combination of a ring shape and a rectangular shape, and a square frame shape and a circle, so that the high frequency sound waves generated in the flat plate diaphragm for treble sounds are transmitted to the peripheral edge. Even if the wavefront is acoustically disturbed, it is not limited to a specific frequency but is dispersed, so the disturbance in the sound pressure frequency characteristics is not large but is dispersed into several small components, and is therefore flat as a whole. It has a sound pressure frequency characteristic,
It has the advantage of enabling high-speed regeneration, and is of great industrial value.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a general composite flat speaker, FIG. 2 is a top view of a conventional composite flat speaker, and FIG. 3 is a top view showing an embodiment of the composite flat speaker of the present invention. FIG. 4 is a top view of another embodiment. 1...Bass magnetic circuit, 6...Frame, 8...
...Magnetic circuit for treble, 14...Edge for bass, 15
... flat plate diaphragm for bass, 16... edge for treble,
17... Flat diaphragm for high-pitched sounds, 18, 21... Magnetic gap, 19, 22... Voile coil.

Claims (1)

[Claims] 1 A magnetic circuit for treble is provided on the magnetic circuit for bass,
A bass flat diaphragm is connected to the frame connected to the bass magnetic circuit through a bass edge, and a treble flat diaphragm is connected to the center of the bass flat diaphragm through a treble edge. When the bass flat diaphragm is ring-shaped, the treble flat diaphragm is rectangular; when the bass flat diaphragm is square frame-shaped, the treble flat diaphragm is circular; A composite flat speaker in which a voice coil that fits into the magnetic gap of the high-pitched magnetic circuit is combined with a voice coil that fits into the magnetic gap of the high-pitched magnetic circuit, and a voice coil that fits into the magnetic gap of the high-pitched magnetic circuit is combined with a high-pitched flat diaphragm.