Multi-diaphragm cylindrical loudspeaker

Abstract

A multi-diaphragm cylindrical loudspeaker comprises a magnet, a voice coil, diaphragms, a folding ring and a support, the cross section of the magnet and the cross section of a magnetic conductive device are in a shape like a Chinese character'shan ', the cross section of the shape like the Chinese character'shan' is increased inwards perpendicular to a paper surface to form a rectangular magnet, a rectangular voice coil is inserted into a rectangular magnetic gap, and a plurality of diaphragms are arranged on the edge of the upper portion of the voice coil. A rectangular rigid body surface is fixed inwards, two devices for driving the rectangular voice coil by the rectangular magnet are arranged side by side, a plurality of pairs of coaxial circular surfaces are distributed above the two devices, a plurality of sub-vibrating diaphragms are distributed above the plurality of pairs of coaxial circular surfaces, and the adjacent sub-vibrating diaphragms are transversely connected through a folding ring. The connected sub-vibrating diaphragm and the folding ring form a cylindrical shape. The voice coil drives the circular surface through the elastic rod, and the elastic rod at the edge of the circular surface drives the sub-diaphragm. The sound production frequency is rich, and the three-dimensional effect is good.

Description

Technical Field

[0001] The present invention relates to a multi-diaphragm cylindrical loudspeaker, belonging to the electro-acoustic device in electronic devices. Background Art

[0002] The loudspeaker mainly consists of a permanent magnet, a magnetic conductor, a magnetic core, a voice coil, a diaphragm, a surround, a centering spider, a bracket, a lead wire, a dust cap and a shielding cover, etc. The materials of the diaphragm include paper cone, plastic, metal, etc. The sound generating mode of the loudspeaker is mainly the moving coil type. The voice coil with an audio current placed in a fixed magnetic field generates the vibration of the voice coil. Most of the current loudspeakers have only one voice coil and one paper cone. The paper cone can only vibrate in one direction, and the generated sound wave is in one direction, and the emitted sound wave is a plane wave without a stereo effect; a paper cone has only one resonant frequency and it is difficult to represent sound waves of multiple frequencies and cannot restore rich frequencies. The human hearing is very sensitive. For example, there are two sound sources in front of the person being tested: one is a loudspeaker and the other is a real person. It is very easy for the person being tested with eyes closed to distinguish who makes the sound. This is because the wave excited by a person's voice in space is approximately a spherical wave with rich frequencies. In order to vividly display the original sound of the sound source, it is very meaningful to study the sound wave emitted by the loudspeaker being approximately a spherical wave. The main inventor of this application has previously studied "a stereo speaker and its supporting microphone CN106954119B, a stereo vibration membrane loudspeaker CN201710336414.5", but it is not enough. In terms of electro-acoustic vividness, further exploration is still needed. Summary of the Invention

[0003] The task of the present invention is to invent a multi-diaphragm cylindrical loudspeaker with rich sound frequencies, good stereo effect and vivid sound.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a multi-diaphragm cylindrical loudspeaker, including a permanent magnet, a magnet conductor, a magnetic core, a voice coil, a diaphragm, a folding ring, a centering support plate, a bracket, a lead and a protective cover. When the permanent magnet, the magnet conductor and the magnetic core are placed horizontally, the central vertical cross-section is in the shape of a "mountain". The "mountain"-shaped cross-section grows inward perpendicular to the paper surface to form a rectangular magnet. Two square magnet conductors are blocked at both ends of the rectangular magnet with a magnetic gap retained to form a rectangular magnetic gap. A rectangular voice coil is inserted into the rectangular magnetic gap. The rectangular centering support plate is connected outwardly to the edge position above the voice coil. The centering support plate is The other end is connected to the bracket; at the upper edge of the voice coil, there is a non-magnetic rectangular rigid surface connected to the voice coil as a whole; there are two devices that constitute the above-mentioned rectangular magnet driving the rectangular voice coil, and the two devices are installed side by side on the bracket on a plane; above the two devices, there are several pairs of coaxial circular surfaces, the center of the circular surface has an axis, the direction of the axis is perpendicular to the direction of the paper, and the axis is fixed to the bracket; above the several pairs of circular surfaces, there is a cylindrical diaphragm surface, the axis center of the cylindrical diaphragm surface is the same as the axis center of the circular surface; the cylindrical diaphragm surface is oriented along the direction of the axis and perpendicular to the axis. The diaphragms are divided into a plurality of four-sided diaphragms, and the distribution of the divided diaphragms is as follows: a plurality of diaphragms are distributed on the circumference above each pair of circular surfaces, and a distance is maintained between the four adjacent sides of the diaphragms; the adjacent diaphragms are horizontally connected by the folding ring, and reassembled into a new cylindrical diaphragm surface including the folding ring; a support rod is fixed to the middle of the folding ring, and the support rod is fixed to the protective cover, and the protective cover is located on the outside of the diaphragm, and the edge of the protective cover is fixed to the bracket; an elastic rod is fixed to the center of each diaphragm, and the other end of the elastic rod is fixed or axially connected to one of the circular surfaces of the pair. On the edge of the surface, the angle between the elastic rod and the tangent line of the edge of the circular surface is between 45°±15°, and at the upper half of the elastic rod, another elastic rod is axially connected, and the other end of the other elastic rod is fixed or axially connected to the edge of the other circular surface of the paired circular surface, and the angle between the other elastic rod and the tangent line of the edge of the other circular surface is between 45°±15°; a third elastic rod is axially connected downwardly to the edge of one of the paired circular surfaces, and the other end of the third elastic rod is fixed to the rectangular rigid body surface, and a fourth elastic rod is axially connected downwardly to the edge of the other circular surface of the paired circular surface, and the other end of the fourth elastic rod is fixed to the other rectangular rigid body surface;Another way to fix the split vibrating diaphragm is, at the center of the split vibrating diaphragm, connect a fixed shaft. One end of a fifth elastic rod and a sixth elastic rod are pivotally connected to the fixed shaft. The other ends of the fifth elastic rod and the sixth elastic rod are respectively pivotally connected to the non-connected ends of the elastic rod and the other elastic rod. The connection of the elastic rod and the other elastic rod to the edges of the circular surface and the other circular surface remains unchanged. The audio signals input to the two voice coils are in the same phase; the area and specific gravity of the split vibrating diaphragm vary at different positions; the spherical angle of the cylindrical vibrating diaphragm surface formed by the split vibrating diaphragm and the surround ranges from 20° to 300°; the material of the elastic rod is a non-magnetic alloy material or a wear-resistant and elastic chemical material. The principle of the present invention is: there are two rectangular magnetic conductors, and a rectangular voice coil is inserted into the magnetic gap of each of them. Each voice coil constitutes a vibration source. The two vibration sources drive the outer edges of a pair of coaxial circular surfaces through two elastic rods. The audio signals input to the two voice coils are in the same phase, so that a pair of circular surfaces will rotate towards each other. Elastic rods are pivotally connected at 45° angles to the tangents of the edges of the two circular surfaces. The angles of rotation of the two circular surfaces are adjusted to make the two elastic rods intersect. The two elastic rods are pivotally connected at the intersection. In this way, the rotation of the two vibration sources on the coaxial circular surfaces through the two elastic rods is converted into the radial movement at the pivot connection of the two elastic rods. One end of an elastic rod above the pivot connection of the two elastic rods is connected to the center of gravity position of a split vibrating diaphragm. The four sides of the split vibrating diaphragm are matched with surrounds to form an independent loudspeaker. The split vibrating diaphragm is continuously installed on the circumferences of the two circular surfaces, and elastic rods are also added to drive each split vibrating diaphragm; several pairs of circular surfaces, elastic rods and split vibrating diaphragms are continuously added on the axis of a pair of circular surfaces, and more independent loudspeakers in different directions can be obtained. When the elastic rod forms a 45° angle with the tangent of the edge of the circular surface, the rotation of the circular surface causes the maximum radial displacement of the split vibrating diaphragm. The resonant frequency of the split vibrating diaphragm is related to its area and specific gravity. Since the area and specific gravity of the split vibrating diaphragm vary at different positions, the entire loudspeaker has a relatively wide frequency response and can reproduce the spectral sounds emitted by different sound sources. In addition, the combined vibration wave of the entire split vibrating diaphragm is a line sound source of a cylindrical wave. When the cylindrical surface of such a loudspeaker is placed vertically, the two ears of a person can also locate, which is much stronger than the planar sound source where one voice coil drives another voice coil to vibrate in one direction before. Since the split vibrating diaphragm is driven by an elastic rod, strictly speaking, it is not a radial vibration. To achieve radial vibration, at the center of the split vibrating diaphragm, connect a fixed shaft. One end of a fifth elastic rod and a sixth elastic rod are pivotally connected to the fixed shaft. The other ends of the fifth elastic rod and the sixth elastic rod are respectively pivotally connected to the non-connected ends of the elastic rod and the other elastic rod. The connection of the elastic rod and the other elastic rod to the edges of the circular surface and the other circular surface remains unchanged. Simplify the circular surface to include a partial circular surface including the center of the circle, which can reduce the mass of the circular surface, reduce the loss of magnetic field force, and improve the efficiency of the loudspeaker;To further reduce the mass of part of the circular surface, the unused parts of the part of the circular surface can be hollowed out. As needed, the spherical angle of the cylindrical shell formed by the partial vibration membrane and the surround ranges from 20° to 300°. A smaller angle is easy to manufacture, while a larger angle results in higher costs. There is a special case where when the spherical angle is 180°, the partial vibration membrane becomes flat, and the emitted sound is a plane wave, but it is still better than the current plane wave because the present invention has several partial vibration membranes with different resonance frequencies, and the emitted audio frequencies are rich. The materials of the elastic rods made of non-magnetic alloy materials include austenitic stainless steel, copper alloy, nickel alloy, titanium alloy, etc.; the elastic rods made of chemical materials include carbon fiber, thermoplastic polyurethane, polyimide, engineering plastics, etc.;

[0005] The beneficial effects of the present invention are as follows: there are many vibration membranes, so there are many sound - generating vibration sources. The resonance frequencies of the vibration membranes are different, and the frequencies are rich; the vibration membranes are distributed on the spherical surface, realizing point - sound emission, with a better three - dimensional effect and lifelike sound. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] In order to more clearly illustrate the technical solution of the present invention, the technical solution will be described below with the help of the drawings.

[0007] Figure 1 It is a three - dimensional view of an embodiment of the present invention with only 1 pair of circular surfaces.

[0008] Figure 2 It is a three - dimensional view of an embodiment of the present invention with 4 pairs of circular surfaces.

[0009] In the figure: 1. Permanent magnet; 2. Magnetic conductor; 3. Magnetic core; 4. Voice coil; 5. Centering washer; 6. Bracket; 7. Rectangular rigid surface; 8. A circular surface; 9. B circular surface; 10. Partial vibration membrane; 11. Surround; 12. Support rod; 13. Protective cover; 14. Elastic rod; 15. Another elastic rod; 16. Third elastic rod; 17. Fourth elastic rod; 18. Another rectangular rigid surface; 19. Fifth elastic rod; 20. Sixth elastic rod. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present invention will be further described below in conjunction with the drawings and embodiments.

[0011] Figure 1It is a stereoscopic diagram of an embodiment of the present invention with only one pair of circular surfaces. It includes a permanent magnet 1, a magnetizer 2, a magnetic core 3, a voice coil 4, a centering support plate 5, and a bracket 6. When the permanent magnet 1, magnetizer 2, and magnetic core 3 are placed horizontally, the central vertical cross section is in the shape of a "mountain". A rectangular voice coil 4 is inserted into the rectangular magnetic gap in the shape of a "mountain". A rectangular centering support plate 5 is connected to the edge position above the voice coil 4. The other end of the centering support plate 5 is connected to the bracket 6. A rigid surface 7 is connected to the edge position above the voice coil 4. In Figure 1, there are two devices for placing the voice coil 4 in the "mountain"-shaped magnetic gap. The two devices are installed side by side on the same bracket 6 on a plane. Above the two devices, a pair of coaxial A circular surfaces 8 and B circular surfaces 9 are distributed. The center of the circular surface has an axis O, and both ends of the axis O are fixed at appropriate positions of the bracket 6. Figure 1 Not shown. Above the A circular surface 8 and the B circular surface 9, there is a cylindrical diaphragm surface, and the axis of the cylindrical diaphragm surface is the same as that of the A circular surface 8 and the B circular surface 9. The cylindrical diaphragm surface is divided into 6 four-sided sub-diaphragms 10 along the direction of the axis O. The arrangement of the sub-diaphragms 10 after division is as follows: a distance is maintained between the sub-diaphragms 10; adjacent sub-diaphragms 10 are horizontally connected by folding rings 11, and reassembled into the cylindrical diaphragm surface before cutting. There is a support rod 12 in the middle of the folding ring 11, and the support rod 12 is fixed on the protective cover 13. The edge of the protective cover 13 is fixed at an appropriate position of the bracket 6. The protective cover 13 is hollow. Figure 1 It is shown by a short line, and the fixation of the hollow protective cover 13 to the bracket 6 is not shown. An elastic rod 14 is fixed to the center of the sub-diaphragm 10 on the A circular surface 8. The other end of the elastic rod 14 is fixed or pivoted to the edge of the A circular surface 8. The angle between the elastic rod and the tangent of the edge of the A circular surface 8 is 45°±15°. At the upper half of the elastic rod 14, another elastic rod 15 is fixed or pivoted. The other end of the other elastic rod 15 is fixed or pivoted to the edge of the B circular surface 9. The angle between the other elastic rod 15 and the tangent of the edge of the B circular surface 9 is 45°±15°. A third elastic rod 16 is pivoted downwardly from the edge of the A circular surface 8. The other end of the third elastic rod 16 is fixed to the rectangular rigid surface 7. A fourth elastic rod 17 is pivoted downwardly from the edge of the B circular surface 9. The other end of the fourth elastic rod 17 is fixed to another rectangular rigid surface 18. Another way of fixing the sub-diaphragm 10 is shown in FIG. Figure 1 At points A3, B3, and C3 in the figure, a fixed axis is connected at the center of the sub-diaphragm 10, and one end of the fifth elastic rod 19 and the sixth elastic rod 20 are axially connected to the fixed axis. The other ends of the fifth elastic rod 19 and the sixth elastic rod 20 are axially connected to the non-connected ends of the elastic rod 14 and the other elastic rod 15 respectively. The connection between the elastic rod 14 and the edge of the A circular surface 8 remains unchanged, and the connection between the other elastic rod 15 and the circular surface and the edge of the B circular surface 9 remains unchanged. Figure 1Among them, one end of six elastic rods 14 is pivotally connected to the A circular surface 8, and the pivot connection points are A1 - A6 respectively. One end of six other elastic rods 15 is pivotally connected to the B circular surface 9, and the pivot connection points are B1 - B6 respectively. The other ends of the six other elastic rods 15 are pivotally connected to the upper half of the six elastic rods 14. Five of the six elastic rods 14 have a sub-vibration membrane 10 fixed at each top end, and the fixing points are C1, C2, C4 - C6. After the remaining one elastic rod 14 and the other elastic rod 15 are pivotally connected, there is an extra length on each rod to form a scissor shape. At the top ends of the scissor-shaped elastic rod 14 and the other elastic rod 15, one end of a fifth elastic rod and a sixth elastic rod are pivotally connected. The other ends of the fifth elastic rod and the sixth elastic rod are respectively pivotally connected and fixed to the center position of the sub-vibration membrane 10, and the pivot connection and fixing position is C3. Such a sub-vibration membrane 10 vibrates radially; the sub-vibration membranes 10 at points C1, C2, C4 - C6 approximately vibrate radially. Since the audio amplitude is generally only at the millimeter level, in some cases, the pivot connection points of A1 - A6 and B1 - B6 can be simplified to fixed points.

[0012] Figure 2 is a three-dimensional view of an embodiment of the present invention with 4 pairs of circular surfaces 8 and circular surfaces 9. For easy observation, the present invention is placed obliquely. There are several sub-vibration membranes 10 around each pair of circular surfaces 8 and circular surfaces 9. The four sides of the sub-vibration membrane 10 are horizontally connected with a surround 11, and the surround 11 combines the sub-vibration membrane 10 into a cylindrical vibration membrane surface. Above the rectangular voice coil 4, there is another rectangular rigid body surface 18. The rectangular rigid body surface 18 drives the B circular surface 9 to rotate a small angle through the fourth elastic rod 17; the rectangular rigid body surface 7 drives the A circular surface 8 to rotate a small angle through the third elastic rod 16; since the audio signals of the two voice coils are in phase, the rotation directions of the A circular surface 8 and the B circular surface 9 are opposite, so that the driving force directions of the elastic rods on the sub-vibration membrane 10 are the same. Figure 1 is Figure 2 a part of, arranging and connecting several Figure 1 will form Figure 2 ; Figure 2 The rectangular magnetic gap and the voice coil 4 of

[0013] The above are only the preferred embodiments of the present invention. The embodiments do not limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-diaphragm cylindrical loudspeaker, comprising a permanent magnet, a magnetic conductor, a magnetic core, a voice coil, a diaphragm, a folding ring, a centering support, a bracket, a lead wire and a protective cover. When the permanent magnet, the magnetic conductor and the magnetic core are placed horizontally, the central vertical cross section is in the shape of a "mountain", and is characterized by: With the "mountain"-shaped cross-section growing perpendicular to the paper surface, a rectangular magnet is formed. Blocking both ends of the rectangular magnet with two square magnetic conductors while leaving a magnetic gap forms a rectangular magnetic gap. In the rectangular magnetic gap, a rectangular voice coil is inserted. At the upper edge position of the voice coil, a rectangular centering support piece is connected outward. The other end of the centering support piece is connected to the bracket. At the upper edge position of the voice coil, there is a non-magnetic rectangular rigid surface connected to the voice coil as a whole. There are two devices that drive the rectangular voice coil with the above-mentioned rectangular magnet. The two devices are installed side by side on the bracket in one plane. Above the two devices, several pairs of coaxial circular surfaces are distributed. There is an axis at the center of the circular surface, and the direction of the axis is perpendicular to the paper surface. The axis is fixed on the bracket. Above several pairs of the circular surfaces, a cylindrical diaphragm surface is distributed. The axis of the cylindrical diaphragm surface is the same as the axis of the circular surface. The cylindrical diaphragm surface is divided into several four-sided sub-diaphragms along the direction of the axis and the direction perpendicular to the axis. The distribution of the divided sub-diaphragms is as follows: There are several sub-diaphragms distributed on the circumference above each pair of the circular surfaces, and there is a certain distance between the adjacent four sides of the sub-diaphragms. The adjacent sub-diaphragms are transversely connected by the surround, and recombined into a new cylindrical diaphragm surface including the surround. A support rod is fixed in the middle of the surround. The support rod is fixed on the protective cover. The protective cover is located outside the sub-diaphragm. The edge of the protective cover is fixed on the bracket. An elastic rod is fixed at the center of each sub-diaphragm. The other end of the elastic rod is fixed or pivotally connected to the edge of one of the paired circular surfaces. The included angle between the elastic rod and the tangent of the edge of the circular surface is between 45°±15°. At the upper half of the elastic rod, another elastic rod is pivotally connected. The other end of the other elastic rod is fixed or pivotally connected to the edge of the other circular surface of the paired circular surfaces. The included angle between the other elastic rod and the tangent of the edge of the other circular surface is between 45°±15°. A third elastic rod is pivotally connected downward from the edge of one of the paired circular surfaces. The other end of the third elastic rod is fixed on the rectangular rigid surface. A fourth elastic rod is pivotally connected downward from the edge of the other circular surface of the paired circular surfaces. The other end of the fourth elastic rod is fixed on the other rectangular rigid surface. Another way to fix the sub-diaphragm is that a fixed shaft is connected at the center of the sub-diaphragm. One ends of a fifth elastic rod and a sixth elastic rod are pivotally connected to the fixed shaft. The other ends of the fifth elastic rod and the sixth elastic rod are respectively pivotally connected to the non-connected ends of the elastic rod and the other elastic rod. The connections of the elastic rod and the other elastic rod to the edges of the circular surface and the other circular surface remain unchanged.

2. The multi-diaphragm cylindrical loudspeaker according to claim 1, wherein: The audio signals input to the two voice coils are in the same phase; the area and specific gravity of the sub-diaphragm are different at different positions; the spherical angle of the cylindrical diaphragm surface formed by the sub-diaphragm and the surround ranges from 20° to 300°; the material of the elastic rod is a non-magnetic alloy material or a wear-resistant and elastic chemical material.

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