CN110493696B - Directional loudspeaker - Google Patents

Abstract

The invention relates to a directional loudspeaker, which comprises a shell, a permanent magnet, a core column, a voice coil, a cone and a centering bracket, wherein the core column is arranged in the shell; also comprises a reduction cylinder and a reverse sounding cavity; the reducing cylinder is fixedly arranged on the inner wall of the voice coil; one end of the reducing cylinder is closed, and a sealing cover is arranged on the wall of the reducing cylinder in a sliding manner; the sealing cover is provided with a transmission cylinder, and the transmission cylinder penetrates through the core column from the axis of the core column; the reverse-phase sounding cavity comprises a reverse-phase vibrating diaphragm, and the direction of the reverse-phase vibrating diaphragm is consistent with that of the cone; a conduction pipe is connected between the reverse sounding cavity and the conduction cylinder, and the reverse sounding cavity, the conduction pipe, the conduction cylinder and the reduction cylinder form a closed air cavity; this directional loudspeaker novel structure, principle are unique, can gather the broadcast range gathering of speaker in less within range to play the effect of directional broadcast, only to target audience propagation information, and can not cause the interference to other residents, thereby improve and use experience.

Description

Directional loudspeaker

Technical Field

The invention relates to the field of loudspeakers, in particular to a loudspeaker with a specific propagation angle.

Background

The loudspeaker is an important component of sound equipment, and can convert an audio electric signal into an acoustic signal which can be heard by human ears, so that more information is transmitted to a user; loudspeakers are used fully in all industries: for example, in a commercial place, sellers circularly play information, prices and preferential activities of products through speakers, and customers can conveniently select the products according to needs; in museums and memorial venues, the loudspeaker introduces the information, such as the age, the value, the background and the like of the collection to the audiences, so that the audiences can know the products and the history of the collection, and the collection can be better understood; in streets and squares, mothers play dynamic music through a loudspeaker, move muscles and bones along with the music and build bodies; it can be said that speakers have become an indispensable part of modern life; however, in these applications, the speaker may generate a large interference, for example, various goods in the market may be played at the same time, and customers who do not have demands around the market may feel noisy; audiences who are not near the collection in the museum can also receive a lot of information, which undoubtedly becomes interference; the music of the public square dance of the mothers often disturbs the residents who rest around.

Disclosure of Invention

In order to solve the problems, the invention provides the directional loudspeaker which is novel in structure and unique in principle, and can gather the broadcasting range of the loudspeaker in a small range, so that the directional broadcasting effect is achieved, information is only spread to a target audience, interference to other residents is avoided, and the use experience is improved.

In order to solve the problems, the technical scheme adopted by the invention is as follows: the directional loudspeaker comprises a shell, a permanent magnet, a core column, a voice coil, a cone and a centering bracket; the core column, the voice coil and the permanent magnet are coaxially arranged, the cone is arranged at one end of the voice coil, and the other end of the voice coil can reciprocate in a gap between the core column and the permanent magnet; the voice coil is limited and connected to the shell through the centering support;

also comprises a reduction cylinder and a reverse sounding cavity; the reducing cylinder is fixedly arranged on the inner wall of the voice coil; one end of the reducing cylinder is closed, and a sealing cover is arranged on the wall of the reducing cylinder in a sliding manner;

the sealing cover is provided with a transmission cylinder, and the transmission cylinder penetrates through the core column from the axis of the core column;

the reverse-phase sounding cavity comprises a reverse-phase vibrating diaphragm, and the direction of the reverse-phase vibrating diaphragm is consistent with that of the cone;

and a conduction pipe is connected between the reverse sounding cavity and the conduction cylinder, and the reverse sounding cavity, the conduction pipe, the conduction cylinder and the reduction cylinder form a closed air cavity.

The invention has the beneficial effects that: audio current is conducted in the voice coil, the audio current generates an induction magnetic field and interacts with the magnetic field generated by the permanent magnet and the core column, and the interaction causes the voice coil to drive the cone to vibrate in a reciprocating mode, so that sound corresponding to the audio current is generated; in the sounding process of the cone, the voice coil reciprocates and translates, and the reduction cylinder synchronously reciprocates along with the voice coil while translating; because the sealing cover is fixedly connected with the conduction cylinder and keeps the sealing cover still, the reduction cylinder moves relative to the sealing cover at the moment, so that the volume in the reduction cylinder and the air pressure change are reduced, the air pressure change is instantly transmitted to the anti-phase sound-emitting cavity through the conduction cylinder and the conduction pipe, and the anti-phase vibration film is further promoted to vibrate correspondingly.

When the cone moves outwards along with the voice coil, the volume in the reduction cylinder is increased, the air pressure is reduced, and then the reverse-phase vibrating diaphragm is sunken towards the inside of the reverse-phase sounding cavity; when the cone moves reversely, the motion state of the reverse-phase vibrating diaphragm is also instantaneously reversed; therefore, the structure can realize that the motion states of the reversed-phase vibrating diaphragm and the cone are always synchronous and reverse, so that the reversed-phase vibrating diaphragm and the cone generate sound wave signals with opposite sound phases; when the sound of the cone diffracts at the edge of the cone, the sound meets the sound generated by the reversed-phase diaphragm, interferes with the sound and is reduced, so that the sound of the diffraction area of the cone is greatly weakened, and the sound can be clearly and efficiently transmitted only in a narrow area in front of the cone.

Therefore, when the loudspeaker is used, sound only spreads in the front area of the cone, and the diffraction zone of the loudspeaker is small, so that the interference to surrounding customers is small; therefore, the effect of directional playing is realized, information is only spread to target audiences, and the audiences can conveniently know products and enjoy music; meanwhile, interference to other customers or residents is avoided, and therefore the use experience of the loudspeaker is effectively improved.

Preferably, the reverse-phase sound-emitting cavity is sleeved outside the shell in an annular cylinder shape, and the reverse-phase vibrating diaphragm is in an annular sheet shape; the reverse-phase vibrating diaphragm and the cone are coaxially arranged, and the reverse-phase vibrating diaphragm and the outer circular edge of the cone are coplanar; the position limitation can further accurately synchronize the reverse-phase vibrating diaphragm with the vibration emitted by the cone, and simultaneously can further reduce the diffraction degree of the sound emitted by the cone, so that the sound is only transmitted in a small range.

Preferably, at least two reverse-phase vibrating membranes are arranged concentrically; the reverse-phase vibrating diaphragm is supported and fixed through a bracket ring; the anti-phase vibrating diaphragms concentrically arranged can synchronously emit anti-phase sound waves, the size of each anti-phase vibrating diaphragm is small, the sound waves are distributed more finely after the sound waves are synchronously emitted, and the sound waves in the diffraction area of the cone are reduced more fully.

Drawings

Fig. 1 is a schematic cross-sectional structure diagram of one embodiment of the present directional loudspeaker.

Detailed description of the preferred embodiments

Example (b):

in the embodiment shown in fig. 1, the directional loudspeaker comprises a housing, a permanent magnet 1, a stem 2, a voice coil 3, a cone 4, and a centering bracket 41; the core column 2, the voice coil 3 and the permanent magnet 1 are coaxially arranged, the cone 4 is arranged at one end of the voice coil 3, and the other end of the voice coil 3 can reciprocate in a gap between the core column 2 and the permanent magnet 1; the voice coil 3 is limited and connected to the shell through a centering bracket 41;

also comprises a reduction cylinder 5 and a reverse sounding cavity 6; the reducing cylinder 5 is fixedly arranged on the inner wall of the voice coil 3; one end of the reducing cylinder 5 is closed, and a sealing cover 51 is arranged on the cylinder wall of the reducing cylinder 5 in a sliding manner;

a conductive cylinder 7 is provided on the seal cap 51, and the conductive cylinder 7 penetrates the stem 2 from the axis of the stem 2;

the anti-phase sounding cavity 6 is sleeved outside the shell in an annular barrel shape, the anti-phase sounding cavity 6 comprises an anti-phase vibrating diaphragm 61, the anti-phase vibrating diaphragm 61 is in a circular ring sheet shape, and the orientation of the anti-phase vibrating diaphragm 61 is consistent with that of the cone 4; the reverse-phase vibrating diaphragm 61 is coaxially arranged with the cone 4, and the reverse-phase vibrating diaphragm 61 is coplanar with the outer circular edge of the cone 4; in this embodiment, there are at least two of the reverse-phase diaphragms 61, and the reverse-phase diaphragms 61 are concentrically arranged; the reverse-phase diaphragm 61 is supported and fixed by a bracket ring 62; a conduction pipe 8 is connected between the reverse sounding cavity 6 and the conduction cylinder 7, and the reverse sounding cavity 6, the conduction pipe 8, the conduction cylinder 7 and the reduction cylinder 5 form a closed air cavity.

Audio current is conducted in the voice coil 3, the audio current generates an induction magnetic field and interacts with the magnetic field generated by the permanent magnet 1 and the core column 2, the interaction causes the voice coil 3 to drive the cone 4 to vibrate in a reciprocating mode, and then sound corresponding to the audio current is generated, such as the area shown by the short dashed line in fig. 1; in the sounding process of the cone 4, the voice coil 3 reciprocates and translates, and the reduction cylinder 5 synchronously reciprocates along with the translation of the voice coil 3; since the sealing cover 51 is fixedly connected with the conduction cylinder 7 and is kept still, the reduction cylinder 5 moves relative to the sealing cover 51 at this time, so that the internal volume and the air pressure of the reduction cylinder 5 are changed, the air pressure change is instantly transmitted to the anti-phase sound-emitting cavity 6 through the conduction cylinder 7 and the conduction pipe 8, and the anti-phase vibrating diaphragm 61 is further promoted to vibrate correspondingly.

When the cone 4 moves outwards along with the voice coil 3, the volume in the reduction cylinder 5 is increased, the air pressure is reduced, and then the reverse-phase vibrating diaphragm 61 is sunken towards the interior of the reverse-phase sounding cavity 6; when the cone 4 moves reversely, the motion state of the reverse-phase diaphragm 61 is also reversed instantaneously; therefore, the motion states of the reverse-phase diaphragm 61 and the cone 4 can be always synchronous and reverse through the structure, so that the two diaphragm and the cone generate sound wave signals with opposite sound phases, such as areas shown by long dashed lines on two sides in fig. 1; when the sound of the cone 4 is diffracted at the edge of the cone 4, the sound meets the sound of the antiphase diaphragm 61 and interferes with and cuts down the sound, so that the sound in the diffraction area of the cone 4 is greatly weakened, and the sound can be clearly and efficiently transmitted only in a narrow area in front of the cone 4, such as the range shown by the shaded area in fig. 1.

In the embodiment, the reverse-phase diaphragm 61 is coplanar with the outer circumferential edge of the cone 4, and this positional relationship enables the reverse-phase diaphragm 61 to be further precisely synchronized with the vibration emitted by the cone 4, and simultaneously enables the diffraction part of the sound emitted by the cone 4 to be further reduced, so that the sound is transmitted only in a small range; meanwhile, the plurality of anti-phase vibrating diaphragms 61 which are concentrically arranged can synchronously emit anti-phase sound waves, and the size of each anti-phase vibrating diaphragm 61 is small, so that the sound waves emitted by the anti-phase vibrating diaphragms 61 are distributed more finely after the sound waves are synchronously emitted, the sound waves in the diffraction area of the cone 4 can be reduced more sufficiently, and the directional propagation effect is further improved.

Therefore, when the loudspeaker is used, sound is only transmitted in the front area of the cone 4, the sound of the diffraction zone of the loudspeaker is small, and therefore the interference to surrounding customers is small, and the effect of directional playing is achieved; when the loudspeaker is used, information is only spread to target audiences, so that the audiences can conveniently know products and enjoy music; meanwhile, interference to other customers or residents cannot be caused, so that the use experience of the loudspeaker is effectively improved, and the order and the silence of a use place are guaranteed.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (3)

1. A directional loudspeaker comprises a shell, a permanent magnet (1), a core column (2), a voice coil (3), a cone (4) and a centering bracket (41); the core column (2), the voice coil (3) and the permanent magnet (1) are coaxially arranged, the cone (4) is arranged at one end of the voice coil (3), and the other end of the voice coil (3) can reciprocate in a gap between the core column (2) and the permanent magnet (1); the voice coil (3) is limited and connected to the shell through a centering support (41); the method is characterized in that: also comprises a reduction cylinder (5) and a reverse sounding cavity (6); the reduction cylinder (5) is fixedly arranged on the inner wall of the voice coil (3); one end of the reducing cylinder (5) is closed, and a sealing cover (51) is arranged on the cylinder wall of the reducing cylinder (5) in a sliding manner; a transmission cylinder (7) is arranged on the sealing cover (51), and the transmission cylinder (7) penetrates through the stem (2) from the axis of the stem (2); the reverse-phase sounding cavity (6) comprises a reverse-phase vibrating diaphragm (61), and the direction of the reverse-phase vibrating diaphragm (61) is consistent with that of the cone (4); a conduction pipe (8) is connected between the reverse sounding cavity (6) and the conduction cylinder (7), and the reverse sounding cavity (6), the conduction pipe (8), the conduction cylinder (7) and the reduction cylinder (5) form a closed air cavity.

2. The directional loudspeaker in accordance with claim 1, wherein: the anti-phase sound-emitting cavity (6) is sleeved outside the shell in an annular cylinder shape, and the anti-phase vibrating diaphragm (61) is in an annular sheet shape; the reverse-phase vibrating diaphragm (61) and the cone (4) are coaxially arranged, and the reverse-phase vibrating diaphragm (61) and the outer circular edge of the cone (4) are coplanar.

3. A directional loudspeaker according to claim 2, wherein: at least two reverse-phase vibrating diaphragms (61) are arranged, and the reverse-phase vibrating diaphragms (61) are concentrically arranged; the reverse-phase diaphragm (61) is supported and fixed by a bracket ring (62).

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