KR970000799B1 - A speaker with magnetic circuit which is light - Google Patents

Abstract

An extra light electromagnetic circuit speaker whereby two neodymium magnetic adhered between the non-magnetic material connects between the electrodes of the voice coils, and the sealed case enclosed the magnetic and the speaker body, is one body as the aluminum basket. The effect of the said speaker provides with the integrated space and the excellent sound quality.

Description

Ultralight magnetic circuit speaker

1 is a cross-sectional view showing a conventional general magnetic circuit spur.

2 is a cross-sectional view showing the ultra-light magnetic circuit spurs according to the present invention.

3 is a cross-sectional view taken along the line II-II of FIG.

* Explanation of symbols for main parts of the drawings

10: drive unit 11: top plate

12: lower plate 13: main magnet

14: auxiliary magnet 15, 22: shield case

16: Pole cap 17: Vibration part

18, 36: damper 19, 37: diaphragm

20, 40: voice coil 21: frame

24, 29: dust cap 25: front case

30: speaker body 31: lower basscat

32: spacer 33: upper magnet

34: lower magnet 35: upper basscat

38: connecting member

The present invention relates to a magnetic circuit speaker. More specifically, two neodymium magnets having the largest repulsive magnetic field are bonded between nonmagnetic materials to be connected between the voids of the voice coil, and a shield case surrounding the magnet and the speaker body is provided. The present invention relates to an ultra-light magnetic circuit spur with a new concept of magnetic circuit spurs formed by integrally forming an aluminum basket.

In general, a magnetic circuit spur is composed of a driving unit for providing a driving source for vibrating the diaphragm up and down, and a vibrating unit for obtaining a constant sound pressure by vibrating the diaphragm up and down by the driving source of the driving unit. Are magnetically and externally shaped according to the components of the drive unit. Casting magnets are used in the inner form, and ferrite magnets are used in the outer form.

Among the magnetic circuit speakers, the magnetic circuit spurker of the magnetic circuit is provided with only a shield case outside the main magnet, and the magnetic circuit speaker has upper and lower plates on the upper and lower surfaces of the main magnet and the auxiliary magnet. Each is mounted and the shield case is covered on the lower surface of the lower plate.

1 is a cross-sectional view showing a conventional general magnetic circuit spur.

Referring to FIG. 1, first, the driving unit 10 has a ***** type lower plate 12 attached to an upper end of a ring-shaped auxiliary magnet 14 attached to the shield case 15. A ring-shaped main magnet 13 is attached between the 12 and the top plate 11 so that a gap at a predetermined interval is formed. In this case, a pole cap 16 is formed at an upper end of the lower plate 12 attached between the main magnet 13 and the auxiliary magnet 14. Next, the vibrating unit 17 driven by the driving unit 10 and the driving source (induction current) configured as described above has a frame 21 having a cone-shaped diaphragm 19 on the top plate 11 of the driving unit 10. The voice coil 20 is formed at the center of the diaphragm 19 so as to be positioned in the gap between the upper and lower plates 11 and 12. At this time, the voice coil 20 is fixedly supported by a damper 18 and a dustproof cap 24 for fixing and supporting the frame 21 and the diaphragm 19. Herein, the air gap in the driving unit 10 refers to a range from the top to the bottom of the voice coil 20 when the voice coil 20 vibrates up and down in the interval between the lower plate 12 and the upper plate 11. .

The conventional magnetic circuit spurs as described above are connected to the voice coil 20 in a state where direct current flux is interlinked by the main magnet 13 and the auxiliary magnet 11 in the gap between the upper and lower plates 11 and 12. As the current (negative current) flows, according to Fleming's left-hand rule, the voice coil 20 causes vertical movement according to the pushing force (F = B · L · I). As the voice coil 20 vibrates up and down, the diaphragm 19 integrally formed with the voice coil 20 also vibrates up and down to generate a predetermined sound pressure, so that the sound pressure is output to the outside of the front case 25.

However, the magnetic circuit spurs as described above are inconvenient that the two main magnets and the auxiliary magnets are bulky and heavy, respectively, between the upper plate 11 and the lower plate 12 of the ***** type. Since the frames for supporting the shield case 15 and the diaphragm 19 to surround them are separately attached and attached, there is a disadvantage in that the assembly process of the speaker is inconvenient.

In addition, there is a disadvantage in that the gap between the upper plate 12 and the lower plate 11 causes an imbalance of magnetic flux density, resulting in distortion of the vertical movement in the voice coil 20, and consequently, distortion of sound pressure.

In addition, an induced current is generated between the upper and lower plates 11 and 12 to generate a heat loss (iron loss) for resistance, and an alternating magnetic flux penetrates the upper and lower plates 11 and 12 to cause hysteresis loss ( Hysterisis Loss) had various problems.

Therefore, the present invention is to solve the conventional problems as described above, the object of the present invention is to attach the two upper and lower magnets between the non-magnetic material disposed between the voids of the voice coil, and to surround the magnet and the speaker body It is to provide an ultra-light magnetic circuit speaker that is space-intensive and has good sound quality by integrally forming the bass itself.

Features of the ultra-light magnetic circuit speaker according to the present invention for achieving the above object, the upper and lower magnets are attached between the non-magnetic material and generates a repulsive magnetic field in the air gap; A pair of voice coils operated by the repulsive magnetic field of the upper and lower magnets, for converting a voice electrical signal into a mechanical signal in a void; A pair of large and different diaphragms attached to the voice coil and vibrating according to a mechanical signal of the voice coil; A damper for supporting the diaphragm and the voice coil; The magnet, the damper and the diaphragm are in a point that consists of a basket that wraps and supports from the outside.

Hereinafter, a preferred embodiment of an ultralight magnetic circuit spur according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a cross-sectional view showing the ultralight magnetic circuit speaker according to the present invention.

Referring to FIG. 2, the main body 30 of the ultralight magnetic circuit spur is provided with lower and upper magnets 33 and 34 attached between a nonmagnetic material 32 made of plastic and between the voice coil 40. Generate a repulsive magnetic field in the voids. In this case, the lower and upper magnets 33 and 34 are used by attaching two neodynium (Nd) magnets having the largest repulsive magnetic field between the nonmagnetic materials 32.

In addition, on both sides of the lower and upper magnets 33 and 34, a pair of voice coils 40 for converting a voice electric signal into a mechanical signal in a void by vertically moving in accordance with the left-hand law of Fleming due to a repulsive magnetic field are provided. It is attached to one end of the damper 36 and the diaphragm 37.

In addition, the magnets 33 and 34, the damper 36 and the diaphragm 37 are shielded by an aluminum basket, and at this time, the lower basket 31 has a ***** shape and a lower magnet 33 ) Is wrapped around and supports the lower vibrating tube 37 by the connecting member 38. The dust cap 39 is attached to the cavity of the upper diaphragm 37 connected to the lower diaphragm.

In the ultra-light magnetic circuit spur according to the present invention configured as described above, referring to FIG. 3, the upper and lower magnets 33 and 34 attached between the nonmagnetic materials 33 face the same polarities (NS↔SN). A strong repulsive magnetic field is formed in the 'A' direction and the 'B' direction. Due to the repulsive magnetic field, a current (negative current) flows in the voice coil 40 in the state where the DC magnetic flux is interlinked, thereby causing the vertical movement of the voice coil 40 in accordance with the Fleming's left hand law.

As the voice coil 40 vibrates up and down, the diaphragm 37 integrally formed with the voice coil 40 also vibrates up and down in a double manner to generate a predetermined sound pressure, so that the voice is outside the front case (not shown). Is output. Here, the diaphragm 37 is attached to the double side to have a wide surface and a narrow surface can cause a more powerful sound pressure.

Therefore, as described above, the ultra-light magnetic circuit spurs according to the present invention are attached between the non-magnetic material and the upper and lower magnets to generate a repulsive magnetic field in the void; A pair of voice coils operated by the repulsive magnetic field of the upper and lower magnets, for converting a voice electrical signal into a mechanical signal in a void; A pair of large and different diaphragms attached to said voice coil and vibrating according to a mechanical signal of said voice coil; A damper for supporting the diaphragm and the voice coil; Since the magnet, the damper, and the diaphragm are formed of an upper / lower bottom basket to support the outside, a speaker having a low height and ultra-light magnetic circuit can be realized.

In addition, by replacing the frame itself for supporting the shield case car diaphragm to surround the magnets with a light weight and integrated aluminum basket, there is a simple advantage of the sputter assembly process. In addition, the balance of magnetic flux density is maintained in the gap between the magnet and the voice coil to compensate for the distortion of sound pressure, and since no support plate for supporting the magnet is used, iron loss and hysteresis loss due to induced current are not generated. There are many advantages, including not.

Claims (3)

Upper and lower magnets attached between the nonmagnetic materials and generating a repulsive magnetic field in the voids; A pair of voice coils operated by the repulsive magnetic field of the upper and lower magnets, for converting a voice electrical signal into a mechanical signal in a void; A pair of large and different diaphragms attached to said voice coil and vibrating at the mechanical signal of said voice coil; A damper for supporting the diaphragm and the voice coil; Ultra-light magnetic circuit speaker, characterized in that consisting of the upper / lower basket to support the magnet, the damper and the diaphragm from the outside. The ultralight magnetic circuit speaker of claim 1, wherein one end of the diaphragm is fixed by a connecting member at one end of the upper basket. The ultra-light magnetic circuit speaker according to claim 1, wherein the dust cap is attached to another diaphragm formed integrally with the diaphragm.