KR200308085Y1 - Speaker with enhanced magnetic flux - Google Patents

Abstract

The speaker having the augmented magnetic flux closing circuit includes a center magnet 12 installed on the inner surface of the hollow space of the lower yoke 11 and a ring magnet 13 positioned on the outer circumferential surface of the center magnet 12 and having opposite polarity. do. The ring magnet 13 traverses the center magnet 12 in the magnetic flux closed circuit and then acts as an induction medium to prevent the loss of magnetic flux by causing the lower yoke magnetic flux to flow within the boundary of the yoke 11. The dual magnet structure achieves increased sensitivity to sound and output capacity in the speaker, while reducing the conventional speaker external volume as a result of the smaller yoke 11.

Description

Speaker with enhanced magnetic flux

The present invention relates to a speaker having an increased magnetic flux, and more particularly to a speaker using dual magnets for increasing the magnetic flux to increase the output capacity of the speaker.

4 shows an enlarged view of a conventional speaker, and the basic components therein include a permanent magnet, a central pole 52, a lower yoke 50, a voice coil 53, an upper yoke 54, and a vibration damper 55. And diaphragm 56. Here, the magnet 51 is located at the center of the hollow lower yoke 50, the center pole 52 is formed on top of the permanent magnet 51, and the voice coil 53 is formed on the outer circumference of the center pole 52. Wound on the upper yoke 54, the upper yoke 54 is located above the central opening of the lower yoke 50, the upper yoke 54 has a hole through the center and an assembly of the voice coil 53 and the central pole 52. The vibration damper 55 may pass through the hole 541, and the vibration damper 55 may be installed above the voice coil 53, and the vibration plate having a conical shape may be installed above the damper 55. The diaphragm 56 is supported by the upper end of the upper yoke 54 and fixed by the circular frame 57. The cover plate 561 is located on the diaphragm 56 covering the voice coil 53 and the center pole 52 in the hollow space of the lower yoke 50.

The operating principle of the speaker will be described later. When a voltage is applied to the voice coil 53, magnetic flux is generated by electromagnetic induction of the magnet 51 to vibrate the vibration damper 55. The strength of the current applied by the voice coil and the magnetic flux of the magnet 51 can determine the output capacity and frequency response of the speaker. The dashed line in the figure indicates the flow of magnetic flux from the magnet 51. The lower yoke 50 flows out of the N pole 51 of the magnet, cuts across the lower yoke 50 and serves as an induction medium in the magnetic flux closing circuit that returns to the S pole of the magnet 51. This magnetic field is the result of magnetic induction from the magnetic field of the voice coil.

5 shows a partial cross-sectional view of another design of a conventional speaker. Compared with the previous speaker, it can be seen that the main difference between the two designs is in the T-shaped yoke 50 which is coupled with the outer ring-shaped permanent magnet 51 to form the speaker using an external magnet. Can be. The magnet 51 uses the T-shaped yoke 50 as the induction medium to form a magnetic closed circuit. As shown by the dotted lines in the figure, the magnetic flux of the ring magnet 51 flows out of the N pole, cuts across the yoke 50 and flows back to the S pole.

Whether using an internal magnet or an external magnet, both speaker designs use yoke 50 as an induction medium to form a magnetic closed circuit. However, the yoke 50 is abraded by the magnetic flux of the magnet for a long time, and weakens the sensitivity to the sound and the output capacity of the speaker over time.

The main object of the present invention is to provide a speaker having an increased magnetic flux by enhancing the magnetic flux in the interface of the yoke in order to improve the sensitivity and output capacity in the sound surface of the speaker.

A speaker consistent with the present invention arranges a center magnet in the center of the hollow yoke and a ring magnet having opposite polarity on the outer circumference of the center magnet to form a ring coupled double magnet structure. The ring magnet acts as an induction medium in the magnetic flux closed circuit to prevent the loss of the magnetic flux beyond the boundary of the yoke and at the same time increase the magnetic flux, so that the speaker's sound sensitivity and output capacity can be significantly improved.

A second object of the present invention is to provide a speaker which reduces the conventional external volume of the speaker while not affecting the output capacity of the speaker. The miniaturization component for the speaker can also be used for other electronic devices.

Features and structures of the present invention can be more clearly understood with reference to the accompanying drawings.

1 is a cross-sectional view of the present invention.

2 is an operating curve diagram of a speaker's output capacity versus frequency response.

3 is an operation curve diagram of a conventional speaker.

4 is a cross-sectional view of a conventional speaker.

5 is a cross-sectional view of another design of the conventional speaker.

※ Description of main part of drawing

11: lower yoke 12: center magnet

13: ring-shaped magnet 50: lower yoke

51: permanent magnet 52: center pole

53: voice coil 54: upper yoke

55: vibration damper 56: vibration plate

57: circular frame 561: cover plate

The invention as implemented by the preferred embodiment will be described below with reference to the drawings.

1 shows a loudspeaker with increased magnetic flux according to the present invention, wherein the components located above the opening of the hollow lower yoke 11 are center pole 52, upper yoke 54, voice coil 53. , Generally the same as the components in FIGS. 4 and 5, including vibration damper 55 and diaphragm 56, so their structure will not be repeated here. The only feature of the present invention is in the internal structure of the lower yoke 11, in which two magnets, the center magnet 12 and the ring magnet 13 are combined and arranged in a ring shape to increase the magnetic flux of the speaker. .

On the inner surface of the hollow space of the lower yoke 11, a ring magnet 13 is provided on the outer circumference of the center magnet 12, with a gap of a predetermined width between the two magnets 12,13. These two magnets are combined in such a way that the polarity of the ring magnet 13 is exactly opposite to the center magnet 12. As shown in the figure, the dotted line represents the flow of magnetic flux starting from the north pole of the center magnet 12 and cutting the ring-shaped magnet 13 from south to north and then returning to the south pole of the center magnet 12. Therefore, the magnetic flux is closed.

Since the ring magnet 13 serves as an induction medium for the magnetic flux closing circuit, the function of the lower yoke 11 is considerably reduced, and the possibility of losing magnetic flux is significantly reduced. Under such magnet arrangement, the center magnet can generate strong magnetic flux in the speaker system.

2 and 3 show a comparison of the operating curves between the new speaker and the conventional speaker in the present invention. Where the X-axis represents the frequency response using a constant interval, while the Y-axis represents the output capacity. The figure shows that the speaker output capacity of the present invention outperforms conventional speakers in the range of frequency responses.

Frequency response 1.0 Khz 1.2Khz 1.5Khz 2.0Khz This invention 89.08 dB output capacity Output capacity89.01 dB 89.39 dB output capacity Output capacity 88.09 dB Conventional speakers 84.63 dB output capacity 84.06 dB output capacity 83.15 dB output capacity 82.61 dB output capacity

As shown in Table 1 above, it is apparent that the combination of the center magnet 12 and the ring magnet 13 can effectively increase the magnetic flux and increase the output capacitance over all frequency responses.

From the foregoing, not only can the output capacity of a speaker having a double magnet structure be improved, but also the size of the internal components such as the size of the speaker and the yoke can be reduced. These internal components can also be used on other electronic products such as mobile telephones and small FM / AM radios.

The preferred embodiments of the present invention described above are merely illustrative and may not limit the scope of the present invention under any circumstances.

Claims (2)

In a speaker having an increased magnetic flux comprising a lower yoke 11 with an empty center, Vibration damper 55, voice coil 53 and upper yoke 54 are provided above the central opening of the lower yoke 11, The center magnet 12 is provided in the empty space of the lower yoke 11, The ring magnet 13 is provided on the inner surface of the lower yoke 11 and the outer circumferential surface of the center magnet 12 and shares the same common axis and has a predetermined width gap between the two magnets 12, 13. Speaker with increased flux, characterized in that the positioning. 2. A speaker with increased magnetic flux according to claim 1, characterized in that the center magnet (12) and the ring magnet (13) are arranged with opposite polarities to each other to form a magnetic flux closing circuit.