CN200966128Y

CN200966128Y - Large-size loudspeaker neodymium-ferrite-boron double magnetic circuit

Info

Publication number: CN200966128Y
Application number: CN 200620027726
Authority: CN
Inventors: 张吉宏; 姚燕; 文章峰; 杨庆海
Original assignee: ZHENMEI ELECTROACOUSTIC APPARATUS CO Ltd TIANJIN
Current assignee: ZHENMEI ELECTROACOUSTIC APPARATUS CO Ltd TIANJIN
Priority date: 2006-10-25
Filing date: 2006-10-25
Publication date: 2007-10-24
Anticipated expiration: 2016-10-25

Abstract

The utility model discloses a neodymium iron boron double magnetic circuit for large-diameter loudspeaker. The utility model is composed of an upper magnetic circuit and a lower magnetic circuit. The upper magnetic circuit comprises an upper splint, a slab-column and a magnet; the lower magnetic circuit comprises a lower splint, screws and a magnet; the top of a truncated cone of the slab-column of the upper magnetic circuit is spliced with the bottom of a neodymium iron boron magnet; the bottom of the upper splint is spliced with the top of the magnet; the top of the splint of the lower magnetic circuit is spliced with the bottom of the neodymium iron boron magnet; the bottom of the slab-column of the upper magnetic circuit is spliced with the neodymium iron boron magnet of the lower magnetic circuit and through holes are drilled at the center of the circle of the slab-column. The unique design deliveries excellent heat dispersion; the heat can be taken away through the air flow in the through holes; the air-gap magnetic field intensity of the magnetic circuit can achieve 1.6T to 1.8T; the efficiency of the electrical-acoustic transformation is high; the utility model is convenient for magnetizing, can assure that each magnet can be magnetized to be saturated and enhances the sensitivity and consistency of the products.

Description

Heavy caliber loud speaker neodymium iron boron double magnetic circuit

Technical field

The utility model belongs to the magnetic circuit in the electro-acoustic element, particularly heavy caliber loud speaker neodymium iron boron double magnetic circuit.

Background technology

At present, loud speaker supper bass unit, particularly subwoofer is widely used in fields such as professional sound equipment, gymnasium, dancing hall, battle wagon sound equipment and home music center, characteristics such as that loud speaker development in the world is just trending towards is high-power, high sensitivity, bass is strong, distortion is little, break through the conventional speaker limit, relate in particular to magnetic circuit system, it and loud speaker overall qualities are closely bound up, the shortcoming of tradition magnetic Circuit Design is: (one) is low in the sensitivity of same overall dimension loud speaker, according to practice and the low at least 6dB of Theoretical Calculation, the magnetic field intensity of magnetic air gap is little; (2) if the output certain power then needs bigger input power, electroacoustic energy conversion efficiency is low, and efficient generally has only a few percent, and poor radiation; (3) the magnetic circuit air-gap is less, and the inhomogeneous and voice coil loudspeaker voice coil ambient magnetic material of magnetic flux distribution can cause certain nonlinear distortion; (4) magnetize difficulty and because of the overheated irreversible demagnetization difficult problem that produces of existing heavy caliber loud speaker neodymium iron boron magnetic circuit, in sum, it is particularly important to overall loud speaker quality to upgrade magnetic Circuit Design.

Summary of the invention

The purpose of this utility model is to develop a kind of heavy caliber loud speaker neodymium iron boron double magnetic circuit, it is a kind of internal magnetization double magnetic circuit, have highly sensitive and the high advantage of electro-acoustic conversion efficiency, solved that heavy caliber neodymium iron boron double magnetic circuit magnetizes and because of the overheated defective that produces irreversible demagnetization, be that a kind of two magnetic circuits up and down magnetize separately, assembling along separate routes, thermal diffusivity is good, distortion is little, has the magnetic circuit of higher magnetic air gap magnetic flux.

The utility model is realized by following step, sees attached native Fig. 1～2, and it is made up of last magnetic circuit and following magnetic circuit; Last magnetic circuit comprises train wheel bridge, sheet-pile, magnet; Following magnetic circuit comprises lower plate, screw, magnet, it is characterized in that: bonding below neodymium iron boron magnetic body on last magnetic circuit sheet-pile round platform, train wheel bridge following with bonding above the magnet; Bonding below neodymium iron boron magnetic body above the following magnetic circuit clamping plate; With bonding above the following magnetic circuit neodymium iron boron magnetic body, and be drilled with through hole (A) below the last magnetic circuit sheet-pile, form whole heavy caliber loud speaker neodymium iron boron magnetic circuit at the sheet-pile circle centre position.

Should be concentric when last magnetic circuit sheet-pile and neodymium iron boron magnetic body and following magnetic circuit lower plate are bonding with neodymium iron boron magnetic body; Magnetic conductor bowl in this magnetic circuit train wheel bridge and the magnetic circuit is an one.

Last magnetic circuit and following magnetic circuit adopt screw to fasten as one.

Advantage of the present utility model and good effect, (1) is drilled with through hole at magnetic circuit at the circle centre position of sheet-pile, this unique design, has good thermal diffusivity, the first will be vibrated the compressed air that is produced and discharge smoothly, reduce distortion, it two is to increase area of dissipation, air flows can be taken away heat, (2) magnetic field intensity that passes in the Strontium ferrite magnetic circuit air gap of uniting is generally 0.1～0.6T, and same size neodymium iron boron magnetic air gap magnetic field intensity can reach 1.6-1.8T, has improved the sensitivity and the electro-acoustic conversion efficiency of loud speaker; (3) this magnetic circuit two magnetic circuits separation up and down are convenient to magnetize, and it is saturated to guarantee that each magnet can both magnetize, and improves the sensitivity and the consistency of product; (4) upward the train wheel bridge of magnetic circuit is designed to and the magnetic conductor bowl one, and this internal magnetization double magnetic circuit has reduced the loud speaker leakage field, can reduce interference to external world; (5) be that a kind of volume is little, in light weight, production technology is simple, and the neodymium iron boron double magnetic circuit of particularly suitable heavy caliber loud speaker is that the magnetic circuit of traditional like product is incomparable.

Description of drawings:

Fig. 1 is the last magnetic circuit and following magnetic circuit generalized section of the utility model magnetic circuit: wherein 1 is that train wheel bridge, 2 is that sheet-pile, 3 is that last magnetic circuit neodymium iron boron magnetic body, 4 is that lower plate, 5 is that magnetic circuit neodymium iron boron magnetic body under screw, 6 is, A are the through hole on the sheet-pile center of circle.

Fig. 2 is that the utility model magnetic circuit integral body is assembled generalized section: wherein 1 is that train wheel bridge, 2 is that sheet-pile, 3 is that last magnetic circuit neodymium iron boron magnetic body, 4 is that lower plate, 5 is that magnetic circuit neodymium iron boron magnetic body under screw, 6 is, A are the through hole on the sheet-pile center of circle.

Embodiment

Below in conjunction with accompanying drawing the utility model is described further, see accompanying drawing 1～2, (1) describedly is drilled with through hole (A) at last magnetic circuit post plate (2) circle centre position and is meant magnetic circuit when last magnetic circuit and the fastening formation one of following magnetic circuit usefulness screw (5), its through hole (A) extends to lower plate (4) center always, in other words, the home position place of whole double magnetic circuit has central through hole (A); (2) to require in design be strict to the diameter of central through hole, as calculated if moderate dimensions, with maximum heat radiation, through hole (A) diameter too greatly then causes voice coil loudspeaker voice coil top layer cross-ventilation deficiency, reduce radiating rate, the too little air that then the vibrating diaphragm vibration can not be produced of through hole (A) diameter is in time discharged, and causes bad problems such as distortion.

Claims

1, heavy caliber loud speaker neodymium iron boron double magnetic circuit, it is made up of last magnetic circuit and following magnetic circuit; Last magnetic circuit comprises train wheel bridge (1), sheet-pile (2), neodymium iron boron magnetic body (3); Following magnetic circuit comprises lower plate (4), screw (5), neodymium iron boron magnetic body (6), it is characterized in that: bonding below neodymium iron boron magnetic body (3) above the round platform at last magnetic circuit sheet-pile (2), and bonding above the following and neodymium iron boron magnetic body (3) of train wheel bridge (1); Bonding below neodymium iron boron magnetic body (6) above the following magnetic circuit clamping plate (4); Last magnetic circuit sheet-pile (2) is following and bonding above the neodymium iron boron magnetic body (6), and is drilled with through hole (A) at sheet-pile (2) circle centre position, forms whole heavy caliber loud speaker neodymium iron boron magnetic circuit.

2, according to the described magnetic circuit of claim 1, it is characterized in that: should be concentric when sheet-pile (2) and neodymium iron boron magnetic body (3) and lower plate (4) are bonding with neodymium iron boron magnetic body (6); Magnetic conductor bowl in this magnetic circuit train wheel bridge (1) and the magnetic circuit is an one.

3, according to the described magnetic circuit of claim 1, it is characterized in that: go up magnetic circuit and following magnetic circuit and adopt screw (5) to fasten as one.