JPH07203588A - Repulsing magnetic field type speaker - Google Patents

Abstract

PURPOSE:To provide a repulsing magnetic flux-type speaker which can be made more thinner by thinning the conventional repulsing magnetic field type speaker which can be thinned. CONSTITUTION:The speaker is constituted in such a way that magnets Ml and M2 magnetized in the thickness direction are arranged so as to making same pole sides placed opposite to each other, a center plate P consisting of a magnetic material is arranged on the confronting surfaces of the both magnets M1 and M2 so as to make it held by them, a voice coil 1 is arranged at the external side of the center plate P so as to make it placed inside a repulsing magnetic flux by the both magnets M1 and M2 and a diaphragm 2 is driven by the voice coil 1. In the speaker, the inner peripheral part of the diaphragm plate 2 is fixed at the upper end part of a voice coil bobbin 6, the inner peripheral part of a damper 3 is fixed at the lower end part of the voice coil bobbin 6 and the coil part 7 of the voice coil is placed in the middle of the diaphragm plate 2 and the damper 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repulsive magnetic field type speaker, and more particularly to a speaker suitable for thinning.

[0002]

2. Description of the Related Art A conventional general speaker uses a magnetic circuit composed of a yoke, a single magnet and a top plate, and has a structure in which a voice coil is arranged in a magnetic gap. In the voice coil, a coil portion is formed below a tubular voice coil bobbin, and the inner peripheral portions of the cone diaphragm and the damper are joined to the upper portion of the voice coil bobbin.

The conventional general speaker as described above cannot be made smaller and thinner, but the repulsive magnetic field type speaker can be made thinner, and we have further improved this repulsive magnetic field type speaker. We proposed a speaker that is thinner, smaller, and has higher performance. The outline of the repulsive magnetic field type speaker is
As shown in FIG. 3, the magnet M magnetized in the thickness direction.
1 and M2 are arranged so that the same poles face each other, and a center plate P made of a magnetic material is sandwiched between the facing surfaces of the magnets M1 and M2, and the magnetic circuit portion is formed by the repulsive magnetic field of the magnets M1 and M2. The voice coil 11 is arranged outside the center plate P so as to be located in the repulsive magnetic field, and the diaphragm 12 is driven by the voice coil. In the figure, 1
3 is a damper, 14 is a holder for holding the magnetic circuit part, 1
Reference numeral 5 is a frame, 16 is a voice coil bobbin, and 17 is a coil portion of the voice coil.

[0004]

However, in the conventional repulsive magnetic field type speaker, the voice coil 11 has the coil portion 17 formed below the tubular voice coil bobbin 16 and the voice coil bobbin 16 above the voice coil bobbin 16. Since the inner peripheral portions of the cone diaphragm 12 and the damper 13 are joined together, the height from the upper end to the bottom of the frame 15 must be larger than the amplitude of the damper 13 or the amplitude of the edge of the diaphragm 12. It is unavoidable that there is
Due to the amplitude of the voice coil 11, it is necessary to further increase the depth of the concave portion formed in the holder 14, and thus it is not possible to make the thickness further thin, and the advantage of the repulsive magnetic field type speaker can be fully utilized. could not.

It is an object of the present invention to provide a repulsive magnetic field type loudspeaker capable of solving the above-mentioned conventional drawbacks and further reducing the thickness.

[0006]

In the repulsive magnetic field type speaker of the present invention, magnets magnetized in the thickness direction are arranged so that the same poles face each other, and a center plate made of a magnetic material is provided on the opposing surfaces of both magnets. In a speaker configured to be sandwiched, a voice coil is arranged outside the center plate so as to be located in a repulsive magnetic field by both magnets, and the diaphragm is driven by the voice coil. The inner peripheral portion of the vibration plate is fixed to the upper end portion and the inner peripheral portion of the damper is fixed to the lower end portion of the voice coil bobbin so that the coil portion of the voice coil is positioned between the diaphragm and the damper. It was done.

[0007]

The inner peripheral portion of the diaphragm is fixed to the upper end portion of the voice coil bobbin, and the inner peripheral portion of the damper is fixed to the lower end portion of the voice coil bobbin. The coil portion of the voice coil includes the diaphragm and the damper. Since it is located in the middle of the frame, the height of the holder, that is, the depth of the speaker can be reduced by making the height from the upper end to the bottom of the frame larger than the amplitude of the damper or the edge of the diaphragm. It becomes possible. Further, since the joints of the vibration system are located above and below the vibration position (voice coil), the linearity of the vibration can be secured and the distortion is reduced.

[0008]

1 is a cross-sectional view of a repulsive magnetic field type loudspeaker according to the present invention. Magnets M1 and M magnetized in the thickness direction.
2 so that the same poles face each other and the center plates P made of a magnetic material are sandwiched between the facing surfaces of the magnets M1 and M2.
A magnetic circuit portion is formed by the repulsive magnetic field of M2.

The voice coil 1 is arranged outside the center plate P so as to be located in the repulsive magnetic field, and the diaphragm 2 is driven by the voice coil. The diaphragm is provided at the upper end of the voice coil bobbin 6. The inner peripheral portion of 2 is fixed, and the inner peripheral portion of the damper 3 is fixed to the lower end portion of the voice coil bobbin 6. As a result, the coil portion 7 of the voice coil is positioned in the middle of the diaphragm 2 and the damper 3, and the coil portion 7 is reliably positioned outside the center plate P.

In the figure, reference numeral 4 designates a holder, which can be made extremely thin as can be seen from the figure, and therefore the depth of the speaker as a whole can be reduced, and the speaker can be made thin and compact. Reference numeral 5 denotes a frame, and the depth to the bottom portion may be a depth at which the damper 3 does not come into contact with the damper 3 at the maximum amplitude. The coil portion 7 is a voice coil bobbin 6
Since the voice coil bobbin 6 is positioned approximately in the middle of the above, the upper end of the voice coil bobbin 6 is held by the diaphragm 2 and the lower end is held by the damper 3, so that rolling during vibration does not occur and linearity can be secured and performance is improved. Is improved.

[0011]

According to the repulsive magnetic field type speaker of the present invention, the inner peripheral portion of the diaphragm is fixed to the upper end portion of the voice coil bobbin, and the inner peripheral portion of the damper is fixed to the lower end portion of the voice coil bobbin. Since the coil part of the voice coil is located between the diaphragm and the damper, the height from the upper end to the bottom of the frame can be made larger than the amplitude of the damper or the amplitude of the edge of the diaphragm. Height, that is, the depth of the speaker can be reduced, and the characteristics of the repulsive magnetic field type speaker can be fully utilized. Also, since the joints of the vibration system are located above and below the vibration position (voice coil), the linearity of vibration can be ensured, distortion can be reduced, and performance can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a repulsive magnetic field type speaker according to the present invention.

FIG. 2 is a schematic cross-sectional view of a main part of a repulsive magnetic field type speaker according to the present invention.

FIG. 3 is a schematic cross-sectional view of a main part of a conventional repulsive magnetic field type speaker.

[Explanation of symbols]

 M1 magnet M2 magnet P center plate 1 voice coil 2 diaphragm 3 damper 4 holder 5 frame 6 voice coil bobbin 7 coil part

Claims (1)

[Claims] 1. A magnet (M
1, M2) are arranged so that the same poles face each other, and the center plates (P) made of a magnetic material are sandwiched between the facing surfaces of both magnets (M1, M2) so that both magnets (M1, M2) are disposed. In the speaker configured such that the voice coil (1) is arranged outside the center plate (P) so as to be located in the repulsive magnetic field by the voice coil and the diaphragm (2) is driven by the voice coil, the voice coil bobbin (6) The inner peripheral part of the diaphragm (2) is fixed to the upper end of the voice coil bobbin (6), and the inner peripheral part of the damper (3) is fixed to the lower end of the voice coil bobbin (6). A repulsive magnetic field type speaker characterized in that 7) is located between the diaphragm (2) and the damper (3).