Patent Description:
Existing loudspeakers generally adopt a structure comprising a conical cone (made of paper, PP and other materials) combined with a damper, the middle of the conical cone and the damper is respectively provided with a central hole, the damper is arranged below the conical cone, a single signal input voice coil passes through the center holes of the damper and the conical cone, and the conical cone and the damper are glued on the voice coil respectively to form a loudspeaker vibration system. This kind of loudspeaker can only be used for single signal input and has limitations on the reproduction of the original sound.

Therefore, one of the current improvements is to adopt a structure comprising a conical cone combined with a damper, wherein the damper is arranged under the conical cone, and the voice coil is changed from the single signal input mode to a multiple signal input mode and passes through center holes of the damper and the conical cone, wherein the voice coil is formed by stacking multiple sets of coils from the inside to the outside, and the conical cone and the damper are glued on the voice coil respectively to form a loudspeaker vibration system. This kind of loudspeaker can be used for multiple signal input. However, since this type of loudspeaker has multiple sets of coils wound on one voice coil, winding multiple sets of coils on one voice coil increases the weight of the voice coil, and when the voice coil drives the cone, the sensitivity of the loudspeaker will be lost.

<CIT> discloses a thin type loudspeaker with two magnetic circuits. , which has a narrow and long shape. <CIT> discloses a loudspeaker including a plurality of driving units, and convex or concave reinforcing parts corresponding to the driving units are provided on the planar vibration plate. <CIT> discloses a speaker apparatus including a speaker frame, an acoustic vibrating plate movably supported on the speaker frame, and a magnetic driver formed in the speaker frame for vibrating the acoustic vibrating plate, wherein the magnetic driver is connected such that it may vibrate different portions of the acoustic vibrating plate independently.

In view of the above-mentioned problems, the present invention provides a multi-input-driving loudspeaker as defined in claim <NUM>, which reduces the distortion of a loudspeaker and also improves the sensitivity and the intelligiblity of the loudspeaker.

In the present invention, "multi-input" refers to multiple audio signal inputs; "multi-input driving" refers to multiple audio signals input to multiple voice coils, and the multiple voice coils jointly drive the loudspeaker to produce sound.

The loudspeaker comprises three or more input driving mechanisms, and the three or more input driving mechanisms are arranged at equal intervals along a circle.

The cone has a cone bottom with a flat-sheet shape and circular as a whole, and a center of the circle coincides with a center of the cone bottom, three or more voice coil mounting holes are opened on the cone bottom, center lines of the voice coil mounting holes pass through the circle, each of the voice coil mounting holes is provided with one voice coil so that the voice coil is connected with the cone bottom; three or more voice coil holes are opened on the damper, and the three or more voice coil holes are arranged at equal intervals along the circle. The bottom of the cone employs a flat-plate shape, reduces the overall height of the cone, facilitates the reduction of the overall height of the loudspeaker, and broadens the directivity.

Three or more magnetic circuit mounting holes are arranged on the frame, the magnetic circuit mounting holes are arranged at equal intervals along the circle, and each of the magnetic circuit mounting holes is provided with one magnetic circuit assembly.

The cone further comprises a tapered edge portion extending obliquely upwards from an outer edge of the cone bottom, and the tapered edge portion is fixedly connected to the frame through a yoke ring.

The frame is provided with a flange surrounding the plurality of magnetic circuit mounting holes, and the damper and the flange cooperate with each other so that the damper is clamped into the flange.

Preferably, the flange is a closed circular ring shape.

The damper has a main body portion shaped as flat-plate.

Preferably, the main body portion comprises a fabric layer and a plastic sheet layer laminated on each other.

In an embodiment, the frame is opened with a vent hole, and the vent hole is arranged between the plurality of magnetic circuit mounting holes. It is conducive to the discharge of the gas generated when the voice coils vibrate up and down and the heat generated during work.

In an embodiment, each of the input driving mechanisms further comprises a dust cover, and each of the voice coil mounting holes is covered with one dust cover.

In an embodiment, each magnetic circuit assembly comprises a U-yoke having an inner cavity, a magnetic steel and a magnetic pole core arranged within the U-yoke, a magnetic gap is formed between the magnetic steel and the magnetic pole core and an inner wall of the U-yoke, the voice coil is inserted in the magnetic gap and capable of moving in an up-and-down direction, and an upper edge of the U-yoke is fixedly connected to the magnetic circuit mounting hole of the frame.

More preferably, the magnetic steel is neodymium magnetic steel or ferrite magnetic steel. In an embodiment, the frame is provided with multiple pairs of audio signal input terminals, each pair of audio signal input terminals is electrically connected to leads of one voice coil. In an embodiment, the frame is provided with a plurality of reinforcing ribs. It can increase the strength of the cone when it is working.

Due to the use of the above technical solutions, the present invention has the following advantages over the prior art:
In the multi-input-driving loudspeaker of the present invention, the structure is ingenious and rational, and the original sound reproduction and distortion are better than that of traditional loudspeakers by receiving audio signal input via multiple voice coils; by the input-driving structure formed by a plurality of voice coils and a plurality of magnetic circuit assemblies, the sensitivity of the loudspeaker is increased, and the intelligiblity of the loudspeaker is improved.

For more clearly explaining the technical solutions in the embodiment of the present invention, the accompanying drawings used to describe the embodiment are simply introduced in the following.

wherein,
<NUM> - frame; <NUM> - magnetic circuit mounting hole; <NUM> - flange; <NUM> - vent hole; <NUM> - cone; <NUM> - voice coil mounting hole; <NUM> - cone bottom; <NUM> - tapered edge portion; <NUM> - reinforcing rib; <NUM> - input drive mechanism; <NUM> - dust cover; <NUM> - voice coil; <NUM> - lead; <NUM> - secondary neodymium magnetic steel; <NUM> - magnetic pole core; <NUM> - main neodymium magnetic steel; <NUM> - U-yoke; <NUM> - damper; <NUM> - voice coil hole; <NUM> - yoke ring; <NUM> - audio signal input terminal.

In the following, the preferable embodiment of the present invention are explained in detail combining with the accompanying drawings so that the advantages and features of the present invention can be easily understood by the skilled persons in the art. It should be noted that the explanation on these implementations is to help understanding of the present invention, and is not intended to limit the present invention.

This embodiment provides a multi-input-driving loudspeaker, herein, "multi-input" refers to multiple audio signal inputs, multiple audio signals are input to multiple voice coils, and the multiple voice coils jointly drive the loudspeaker to produce sound. Referring to <FIG>, the multi-input-driving loudspeaker comprises a frame <NUM>, a cone <NUM>, a plurality of input driving mechanisms <NUM>, and one damper <NUM>. The cone <NUM> is used to vibrate to produce sound, and is fixed arranged on the frame <NUM>. Each input driving mechanism <NUM> comprises a voice coil <NUM> and a magnetic circuit assembly for driving the voice coil <NUM> to vibrate; wherein, the frame <NUM> is provided with a plurality of magnetic circuit mounting holes <NUM>, and at most one magnetic circuit assembly is arranged at each magnetic circuit mounting hole <NUM>; the cone <NUM> is provided with a plurality of voice coil mounting holes <NUM>, and at most one voice coil <NUM> is provided at each voice coil mounting hole <NUM>; the damper <NUM> is round as a whole, and is provided with a plurality of voice coil holes <NUM>, and at most one voice coil <NUM> passes through each voice coil hole <NUM>. That is, the plurality of input-driving mechanisms is mounted on the frame <NUM> and the cone <NUM>. There are three or more input driving mechanisms <NUM> to increase the driving energy of the loudspeaker, and the three or more input driving mechanisms <NUM> are arranged at equal intervals along a circle. The cone has a cone bottom <NUM> with a flat-sheet shape and circular as a whole, and the center of the circle coincides with the center of the cone bottom <NUM>, that is, the plurality of input driving mechanisms <NUM> is arranged at equal intervals along the circle of the cone bottom <NUM>. Correspondingly, the cone bottom <NUM> is provided with three or more voice coil mounting holes <NUM>, center lines of the voice coil mounting holes <NUM> pass through the circle, and each of the voice coil mounting holes <NUM> is provided with one voice coil <NUM> so that the voice coil <NUM> is connected with the cone bottom <NUM>; the frame <NUM> is provided with three or more magnetic circuit mounting holes <NUM>, the magnetic circuit mounting holes <NUM> are arranged at equal intervals along the circle, and each of the magnetic circuit mounting holes <NUM> is provided with one magnetic circuit assembly; the damper <NUM> is also provided with three or more voice coil holes <NUM>, the voice coil holes <NUM> are arranged at equal intervals along the circle, center line of each voice coil hole <NUM> passes through the circle, each voice coil hole <NUM> is penetrated by one voice coil <NUM>, and the diameter of the voice coil holes <NUM> matches the outer diameter of the voice coils <NUM>, so that the voice coils <NUM> are tightly arranged in the damper <NUM>. Specifically, as shown in <FIG>, the number of the input driving mechanisms <NUM>, the voice coil mounting holes <NUM> and the magnetic circuit mounting holes <NUM> are all three, and they are evenly arranged in a ring around the center of the cone bottom <NUM>.

In this embodiment, it is preferable to adopt a cone whose bottom is a circular shape as a whole, and the plurality of input-driving mechanisms are arranged in a ring around the circle of the bottom of the cone. In some other embodiment, the cone has an oval or rectangular cone bottom, and the plurality of the input-driving mechanisms are arranged linearly or in an array.

In this embodiment, the frame <NUM> is made of plastic using processes such as injection molding, which is easy to form and has a certain strength, and the magnetic circuit mounting holes <NUM> are through holes that penetrate the frame <NUM> from top to bottom. The cone <NUM> further comprises a tapered edge portion <NUM> extending obliquely upwards from the outer edge of the cone bottom <NUM>, and the tapered edge portion <NUM> is arranged in a circle around the cone bottom <NUM>. The cone <NUM> is made of paper pulp, plastic (such as, PP (polypropylene)), ballistic fiber or aluminum alloy, and the made cone <NUM> is light in weight, has good damping elasticity and rigidity, high temperature and low temperature resistance, waterproof and mildew proof. In addition, the tapered edge portion <NUM> of the cone <NUM> is fixedly connected to the frame <NUM> through a yoke ring <NUM>, which is made of sponge, rubber, or cloth. With the cone <NUM> with the above-mentioned shape, the directional expansion width is superior to that of the traditional conical loudspeaker, and the height is lower than that of the traditional conical cone <NUM>, which is beneficial to reducing the overall height of the loudspeaker.

The damper <NUM> is located in the cavity formed between the frame <NUM> and the cone <NUM> after they are connected, and is clamped into the frame <NUM>, and with the restrict of the damper <NUM>, the voice coils <NUM> can only move up and down, and cannot produce displacement in the horizontal direction. Specifically, the frame <NUM> has an upwardly extending flange <NUM> surrounding the three magnetic circuit mounting holes <NUM>, the flange <NUM> is specifically a closed ring-shaped protrusion, and the damper <NUM> is clamped into the flange <NUM>, and the outer edge of the damper <NUM> is in close contact with the inner wall of the flange, so that the damper <NUM> can be retained by the inner walls of the flange <NUM> (as shown in <FIG>) to prevent the damper <NUM> from shaking. The main body portion of the damper <NUM> is flat, the edge of the damper <NUM> has annular recesses and protrusions, the voice coil holes <NUM> are opened on the main body portion of the damper <NUM>, and the main body portion of the damper <NUM> comprises a fabric layer and a plastic sheet layer laminated on each other, the plastic sheet layer is fitted on the fabric layer, to increase the strength of the damper <NUM>.

The frame <NUM> is opened with a vent hole <NUM> in the middle, and the vent hole <NUM> is arranged between the three magnetic circuit mounting holes <NUM>, the vent hole <NUM> runs through the middle of the frame <NUM> from top to bottom, which is conducive to the discharge of the gas generated when the voice coils vibrate up and down and the heat generated during work.

Each input-driving mechanism <NUM> also comprises a dust cover <NUM>. The specific structure of the input-driving mechanisms <NUM> will be described in detail below. As shown in <FIG>, each input-driving mechanism <NUM> constitutes of a dust cover <NUM>, a voice coil <NUM>, a secondary neodymium magnetic steel <NUM>, a magnetic pole core <NUM>, a main neodymium magnetic steel <NUM>, and a U-yoke <NUM>. In each of the input-driving mechanism <NUM>, the dust cover <NUM> is fixedly connected to the cone <NUM>, each voice coil mounting hole <NUM> is covered with one dust cover <NUM>, and the voice coil <NUM> is covered under the dust cover <NUM>. The upper end portion of the voice coil <NUM> is inserted into and close fit with the voice coil mounting hole <NUM> of the cone <NUM>, and the voice coil <NUM> is connected to the cone <NUM> to drive the cone <NUM> to vibrate. The U-yoke <NUM> has an inner cavity and an open upper end, the upper edge of the U-yoke <NUM> is fixedly connected at the magnetic circuit mounting hole <NUM> (such as the hole wall of the magnetic circuit mounting hole <NUM>, or the lower surface of the frame <NUM> adjacent to the magnetic circuit mounting hole <NUM>), and the magnetic circuit mounting hole <NUM> is in communication with the inner cavity of the U-yoke <NUM>; the secondary neodymium magnetic steel <NUM>, the magnetic pole core <NUM>, and the main neodymium magnetic steel <NUM> are stacked from top to bottom, and are fixedly arranged in the inner cavity of the U-yoke <NUM>, forming a magnetic circuit assembly; the lower surface of the secondary neodymium magnetic steel <NUM> is closely attached to the upper surface of the magnetic pole core <NUM>, and the lower surface of the magnetic pole core <NUM> is closely attached to the upper surface of the main neodymium magnetic steel <NUM>; there are a gap between the secondary neodymium magnetic steel <NUM>, the magnetic pole the core <NUM> and the main neodymium magnetic steel <NUM> and the inner wall of the U-yoke <NUM>, thereby forming a magnetic gap surrounding the secondary neodymium magnetic steel <NUM>, the magnetic pole core <NUM> and the main neodymium magnetic steel <NUM>, the lower end of the voice coil <NUM> is inserted into the magnetic gap downward from the magnetic circuit mounting hole <NUM>, there is a gap between the voice coil <NUM> and the secondary neodymium magnetic steel <NUM>, the magnetic pole core <NUM> and the main neodymium magnet <NUM>, and there is also a gap between it and the inner wall of the U-yoke <NUM>, so that it can move up and down in the magnetic gap.

The magnetic circuit assemblies in this embodiment adopt the aforementioned secondary neodymium magnetic steel and the main neodymium magnetic steel, which has the advantages of small volume and light weight. In some other embodiment, the aforementioned secondary neodymium magnetic steel and the main neodymium magnetic steel in the magnetic circuit assemblies can be replaced with ferrite magnetic steel respectively, thereby reducing the cost of the magnetic circuit assemblies.

As shown in <FIG> and <FIG>, the frame <NUM> is provided with three pairs of audio signal input terminals <NUM> at the edge portion, the three pairs of audio signal input terminals <NUM> are arranged at equal intervals along the circle, the frame <NUM> is provided with slots for connecting external cables, and each pair of audio signal input terminals <NUM> is electrically connected to a lead of one voice coil <NUM>. Wherein, each pair of audio signal input terminals <NUM> comprises a positive terminal and a negative terminal, one lead of each voice coil <NUM> is electrically connected to the positive terminal of one pair of audio signal input terminals <NUM>, and another lead is electrically connected to the negative terminal of this pair of audio signal input terminals <NUM>, to receive the audio signal (analog signal or digital signal) input from the pair of audio signal input terminal <NUM>. Thus, three voice coils <NUM> are simultaneously driven through the three pairs of audio signal input terminals <NUM>. By providing multiple integrated terminals for audio signal input in the frame <NUM>, the positive and negative leads of each voice coil <NUM> can be connected to the intermediate terminals at the bottom of the frame <NUM>, and this connection method simplifies the manufacture of multi-input-driving loudspeakers, and is also convenient for the connection of audio signal input.

As shown in <FIG>, a plurality of reinforcing ribs <NUM> are provided on the cone <NUM>, which can increase the working strength of the cone <NUM>. Specifically, as shown in <FIG>, a plurality of reinforcing ribs <NUM> are arranged at equal intervals along the circumferential direction of the cone <NUM>, and each reinforcing rib <NUM> extends along the radial direction of the cone <NUM>. The reinforcing ribs <NUM> are located between the voice coil mounting holes <NUM>. In addition, the reinforcing ribs <NUM> extend from the cone bottom <NUM> to the tapered edge portion <NUM>, thereby enhancing the strength between the flat cone bottom <NUM> and the tapered edge portion <NUM>. The working principle of the multi-input-driving loudspeaker is: the audio signal is input to the plurality of voice coils <NUM> through the audio signal input terminals <NUM> on the frame <NUM>, and the plurality of voice coils <NUM> move up and down synchronously under the action of the magnetic circuit assemblies, thereby driving the cone <NUM> to vibrate to produce sound. The multi-input-driving loudspeaker of the present invention adopts a cone <NUM> with a flat-shaped bottom, three or more voice coil mounting holes <NUM> are provided on the plane formed by the cone bottom <NUM>, and tightly fitted with three or more voice coils <NUM>, and then the voice coils <NUM> are tightly fitted with the damper <NUM> to form three or more input-driving mechanisms <NUM>, and by using three or more magnetic circuit assemblies to drive the voice coils <NUM>, and three or more voice coils <NUM> to drive the voice cone <NUM>, it can not only reduce the height of the product, but also broaden the directivity of the product, and through multiple audio signal inputs, it can reduce the distortion of the product, increase the sensitivity of the loudspeakers, and improve the intelligiblity of the loudspeaker. The use of integrated terminals simplifies the connection of the product and facilitates the connection of audio signal input.

The loudspeaker structure is ingenious and rational, and through the use of a flat-bottom conical cone structure, the flat-bottom conical cone has a better directivity than traditional loudspeakers; by receiving the audio signal input via three or more voice coils, the original sound reproduction and distortion are better than that of traditional loudspeakers; by adopting a cone shape with flat-bottom, the height of the cone is lower than that of the traditional conical cone, and the reduction of the height of the cone can also reduce the height of the product; by using an input-driving structure composed of three or more voice coils and three or more magnetic circuit assemblies, the sensitivity of the loudspeaker is increased; by closely connecting the flat-bottom conical cone with three or more voice coils, the three or more voice coils are driven through three or more audio signal inputs to move up and down in the U-yoke magnetic circuit to drive the cone to sound.

Claim 1:
A multi-input-driving loudspeaker, comprising a frame (<NUM>), and a cone (<NUM>) arranged on the frame (<NUM>), three or more input driving mechanisms (<NUM>) arranged at equal intervals along a circle, wherein
each of the input driving mechanisms (<NUM>) comprises a voice coil (<NUM>) and a magnetic circuit assembly for driving the voice coil (<NUM>) to vibrate;
wherein the frame (<NUM>) is provided with three or more magnetic circuit mounting holes (<NUM>) arranged at equal intervals along the circle, and each of the magnetic circuit mounting holes (<NUM>) is provided with one magnetic circuit assembly, and at most one magnetic circuit assembly is arranged at each magnetic circuit mounting hole (<NUM>);
wherein the cone (<NUM>) is provided with three or more voice coil mounting holes (<NUM>), and at most one voice coil (<NUM>) is provided at each voice coil mounting hole (<NUM>), the cone (<NUM>) has a cone bottom (<NUM>) with a flat-sheet shape and circular as a whole, and a center of the circle coincides with a center of the cone bottom (<NUM>), the three or more voice coil mounting holes (<NUM>) are opened on the cone bottom (<NUM>), center lines of the voice coil mounting holes (<NUM>) pass through the circle, each of the voice coil mounting holes (<NUM>) is provided with a corresponding one of the voice coils (<NUM>) so that each voice coil (<NUM>) is connected with the cone bottom (<NUM>);
wherein the cone (<NUM>) further comprises a tapered edge portion (<NUM>) extending obliquely upwards from an outer edge of the cone bottom (<NUM>) in an opposite direction to a direction facing the voice coils, and an upper edge of the tapered edge portion (<NUM>) is fixedly connected to the frame (<NUM>) through a yoke ring (<NUM>);
wherein the frame (<NUM>) is provided with a flange (<NUM>) surrounding the plurality of magnetic circuit mounting holes (<NUM>),
the multi-input-driving loudspeaker being characterised in that
the loudspeaker further comprises a single damper (<NUM>), wherein
the damper (<NUM>) is opened with three or more voice coil holes (<NUM>), and each of the voice coils (<NUM>) passes through a corresponding voice coil hole (<NUM>) and is in contact with the damper (<NUM>), and the three or more voice coil holes (<NUM>) are arranged at equal intervals along the circle;
and the damper (<NUM>) and the flange (<NUM>) cooperate with each other so that the damper (<NUM>) is clamped into the flange (<NUM>).