External magnetic circuit structure for loudspeaker

Abstract

The utility model discloses an external magnetic circuit structure for a loudspeaker. Comprising a T iron arranged in the loudspeaker, a short circuit ring sleeved at the upper end of the T iron, a plurality of magnets which are arranged at the upper end of the T iron and are uniformly arranged and annularly arranged on the outer side of the short circuit ring, and a magnetic conductive sheet which is sleeved at the upper end of the T iron and is positioned above the short circuit ring and the magnets. The external magnetic circuit structure for the loudspeaker provided by the utility model is low in cost, good in heat dissipation and cooling effects, light in weight, applicable to loudspeakers with different powers, and higher in practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of loudspeakers, in particular to an external magnetic circuit structure used on a loudspeaker. Background Art

[0002] At present, the magnets used to assist vibration in speakers in the industry basically use the conventional internal magnetic design. The diameter of the magnetic block is greatly limited. In order to make the magnetic field strength of the magnetic circuit meet high requirements, the outer diameter of the magnet must be increased. However, due to the coil diameter and the inner diameter of the U iron, it is actually difficult to increase the diameter of the magnet. When the magnetic field is not enough, it is generally supplemented by adding an additional auxiliary magnet. This method of adding an additional auxiliary magnet is costly, difficult to operate, and the effect is not very ideal. Moreover, if a neodymium magnetic internal magnetic circuit is used, when the coil diameter exceeds 1.5 inches, the magnetic circuit strength is basically saturated. If the inner diameter of the U iron is further increased, the cost will increase exponentially.

[0003] Moreover, this internal magnetic structure places the magnet inside the U iron, which is very unfavorable for heat dissipation. When the temperature exceeds 100 degrees, ordinary neodymium magnets will usually demagnetize and the magnetic field will weaken. The higher the temperature rises, the more severe the demagnetization of the magnetic block. Utility Model Content

[0004] In view of the above-mentioned deficiencies, the purpose of the present utility model is to provide an external magnetic circuit structure for a loudspeaker, which has low cost, good heat dissipation and cooling effects, light weight, can be applied to loudspeakers of different powers, and has higher practicality.

[0005] The technical solution adopted by the utility model to achieve the above-mentioned purpose is:

[0006] An external magnetic circuit structure for a loudspeaker includes a T-iron arranged in the loudspeaker, a short-circuit ring sleeved on the upper end of the T-iron, a plurality of magnets arranged on the upper end of the T-iron and evenly arranged on the outside of the short-circuit ring, and a magnetic conductive sheet sleeved on the upper end of the T-iron and located above the short-circuit ring and the magnet.

[0007] As a further improvement of the present invention, an I-shaped pole is formed in the middle of the T-iron, and the short-circuit ring, the magnet, and the magnetic conductive sheet are sleeved on the pole.

[0008] As a further improvement of the present invention, the bottom of the T iron is in the shape of a truncated cone with a diameter decreasing from top to bottom, and an inner groove is formed between the inner side of the T iron and the pole.

[0009] As a further improvement of the utility model, the magnet is a neodymium iron boron magnet.

[0010] As a further improvement of the present invention, the short-circuit ring is a cylindrical aluminum short-circuit ring.

[0011] As a further improvement of the present invention, the magnetic conductive sheet is a low-carbon steel magnetic conductive sheet.

[0012] The beneficial effects of the utility model are:

[0013] By setting the structure to include a T-iron arranged in the speaker, a short-circuit ring sleeved on the upper end of the T-iron, several magnets arranged on the upper end of the T-iron and evenly arranged outside the short-circuit ring, and a magnetic conductive sheet sleeved on the upper end of the T-iron and located above the short-circuit ring and the magnet, the T-iron is used as a base to stabilize other structures and guide the magnetic field of the magnet into the gap of the magnetic conductive sheet. The diameter, thickness and number of the magnets can be freely combined and adjusted according to actual conditions, so that it can be applied to the calibers of speaker voice coils of different specifications, so that high-power speakers can also be applied to this structure. In addition, by evenly arranging several magnets, the overall volume of the magnet is small, and its production cost is lower than that of ordinary integral magnets. When assembling, it is assembled by a jig so that it is evenly arranged around the T-iron to form an array. After magnetization, the magnetic lines of force of each magnet can be evenly distributed, thereby improving practicality and ensuring the service life of the speaker. In addition, the structure in which the magnet is arranged outside the short-circuit ring makes most of the magnet exposed to the air, which is more conducive to heat dissipation and cooling of the magnet than the conventional internal magnet built-in magnet. The short-circuit ring serves as a reference for evenly arranging the magnets, facilitating the installation of the magnets, and in this structure can shield part of the magnetic field, reduce the distortion caused by the magnetic field, and prevent foreign matter from entering the middle of the magnets, reducing the interference of the magnets by external foreign matter. The magnetic conductive sheet plays a role of magnetic conductivity and is used in conjunction with the T iron.

[0014] The above is an overview of the technical solution of the utility model. The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an exploded view of the utility model;

[0016] Figure 2 It is a front view of the utility model;

[0017] Figure 3 for Figure 2 Cross-section of the middle AA;

[0018] In the figure: 1, T iron; 11, pole; 12, cone; 13, inner groove; 2, short-circuit ring; 3, magnet; 4, magnetic sheet. DETAILED DESCRIPTION

[0019] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0020] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0022] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Please refer to Figures 1 to 3 An embodiment of the utility model provides an external magnetic circuit structure for a speaker, including a T-iron 1 arranged in the speaker, a short-circuit ring 2 sleeved on the upper end of the T-iron 1, a plurality of magnets 3 arranged on the upper end of the T-iron 1 and evenly arranged and ringed on the outside of the short-circuit ring 2, and a magnetic conductive sheet 4 sleeved on the upper end of the T-iron 1 and located above the short-circuit ring 2 and the magnet 3.

[0024] The T-iron 1 is used as a base to stabilize other structures and guide the magnetic field of the magnet 3 into the gap of the magnetic conductive sheet 4.

[0025] The diameter, thickness and quantity of the magnet 3 can be freely combined and adjusted according to the actual situation, so that it can be applied to the caliber of the speaker voice coil of different specifications. The caliber of the voice coil can reach 100 cores / 4INCH, and the internal magnet can reach up to 38 cores / 1.5INCH, so that high-power speakers can also be applied to this structure, and no auxiliary magnet is required. In addition, the overall volume of the magnet 3 is smaller by evenly arranging several magnets 3, and its production cost is lower than that of ordinary integral magnets 3. Under the same conditions, the structure of cylindrical multiple groups of magnets 3 can reduce the cost by 50%-70% compared with the same circular magnets of the same energy level. In addition, the magnets 3 are assembled by a jig so that they are evenly arrayed around the T iron 1. After magnetization, the magnetic lines of each magnet 3 can be evenly distributed, which improves practicality and ensures the service life of the speaker. In addition, the structure in which the magnet 3 is arranged outside the short-circuit ring 2 makes most of the magnet 3 exposed to the air. Compared with the conventional internal magnet type built-in magnet 3, the heat dissipation effect is improved by more than 30%, and the temperature is reduced by more than 30°, which is more conducive to the heat dissipation and cooling of the magnet 3.

[0026] like Figure 1 and Figure 3 As shown, the short-circuit ring 2 serves as a reference for the uniform arrangement of the magnets 3, which facilitates the installation of the magnets 3. In this structure, it can shield part of the magnetic field, reduce the distortion caused by the magnetic field, and prevent foreign matter from entering the middle of the magnets 3, reducing the interference of foreign matter on the magnets 3. The magnetic conductive sheet 4 plays a role of magnetic conductivity and is used in conjunction with the T-iron 1.

[0027] The specific method of arranging the short-circuit ring 2, the magnet 3 and the magnetic conductive sheet 4 on the T-iron 1 is as follows: Figure 1 and Figure 3 As shown, an I-shaped pole 11 is formed in the middle of the T-iron 1, and the short-circuit ring 2, magnet 3, and magnetic conductive sheet 4 are sleeved on the pole 11. The I-shaped structure can more efficiently guide the magnetic field of the magnet 3 into the gap of the magnetic conductive sheet 4 to assist vibration.

[0028] For better speaker sound quality, Figure 1 and Figure 3 As shown, the bottom of the T-iron 1 is in the shape of a cone 12 whose diameter decreases from top to bottom, and an inner groove 13 is formed between the inner side of the cone and the pole 11, thereby increasing the downward stroke of the voice coil, thereby pushing a larger volume of air, making the low-frequency volume more sufficient.

[0029] In order to further improve the practicality of this structure, the magnet 3 is a neodymium iron boron magnet 3, which has strong magnetism, small size and light weight, and expands the scope of using neodymium magnets as magnetic circuits for large-diameter and high-power speakers. Neodymium magnets have strong magnetism. Under the same power, the unit weight is only about 1 / 3 of that using ferrite magnets, which is lighter and more practical.

[0030] In order to further reduce the distortion problem of the magnetic field in this structure, the short-circuit ring 2 is a cylindrical aluminum short-circuit ring 2. Aluminum alloy has the advantages of light weight, pressure resistance, good heat dissipation, vibration resistance, and ability to absorb electromagnetic radiation. Compared with other metals, it can provide more accurate sound and lower distortion.

[0031] In order to further reduce the magnetic resistance, the magnetic conductive sheet 4 is a low-carbon steel magnetic conductive sheet 4. The carbon content of low-carbon steel is very low, thereby effectively reducing the magnetic resistance and improving the magnetic conductive effect.

[0032] It should be noted that the external magnetic circuit structure for the loudspeaker disclosed in the utility model is an improvement on the specific structure, and the specific control method is not the innovation of the utility model. The voice coil, fixture and other components involved in the utility model can be general standard parts or components known to those skilled in the art, and their structures, principles and control methods are all known to those skilled in the art through technical manuals or conventional experimental methods.

[0033] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, other structures obtained by adopting the same or similar technical features as the above embodiments of the present invention are within the protection scope of the present invention.

Claims

1. An external magnetic circuit structure for a speaker, characterized in that: The speaker comprises a T-iron arranged in the speaker, a short-circuit ring sleeved on the upper end of the T-iron, a plurality of magnets arranged on the upper end of the T-iron and evenly arranged and arranged outside the short-circuit ring, and a magnetic conductive sheet sleeved on the upper end of the T-iron and located above the short-circuit ring and the magnet; an I-shaped pole is formed in the middle of the T-iron, and the short-circuit ring, the magnet and the magnetic conductive sheet are sleeved on the pole; the magnet is a neodymium iron boron magnet; the short-circuit ring is a cylindrical aluminum short-circuit ring; and the magnetic conductive sheet is a low-carbon steel magnetic conductive sheet.

2. The external magnetic circuit structure for a speaker according to claim 1, characterized in that: The bottom of the T iron is in the shape of a truncated cone with a diameter decreasing from top to bottom, and an inner groove is formed between the inner side of the T iron and the pole.

Images