JP2981392B2 - Repulsive magnetic field type speaker - Google Patents

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. The voice coil has a coil portion formed at a lower portion of a cylindrical voice coil bobbin, and an inner peripheral portion of each of a cone diaphragm and a damper is joined to an upper portion of the voice coil bobbin.

Although the conventional general loudspeaker cannot be made smaller and thinner, the repulsive magnetic field loudspeaker can be made thinner. We have further improved this repulsive magnetic loudspeaker. A thinner, smaller, and higher performance speaker was proposed. The outline of the repulsion magnetic field type speaker is
As shown in FIG. 3, a 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 opposing surfaces of both 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 a magnetic circuit part, 1
5 is a frame, 16 is a voice coil bobbin, and 17 is a coil part of a voice coil.

[0004]

However, in the conventional repulsive magnetic field type loudspeaker, the voice coil 11 has a coil portion 17 formed below a cylindrical voice coil bobbin 16 and a voice coil bobbin 16 formed above the voice coil bobbin 16. Since the inner peripheral portions of the cone diaphragm 12 and the damper 13 are joined, the height from the upper end to the bottom of the frame 15 needs to be larger than the amplitude of the damper 13 or the amplitude of the edge of the diaphragm 12. Even if it is unavoidable that there is
Due to the amplitude of the voice coil 11, the depth of the recess formed in the holder 14 needs to be further increased. Therefore, the thickness cannot be further reduced, and the advantage of the repulsion magnetic field type speaker can be fully utilized. could not.

An object of the present invention is to provide a repulsive magnetic field type speaker which can solve the above-mentioned conventional drawbacks and can be made thinner.

[0006]

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

[0007]

The inner periphery of the diaphragm is fixed to the upper end of the voice coil bobbin, and the inner periphery of the damper is fixed to the lower end of the voice coil bobbin. Because the height from the top to the bottom of the frame is larger than the amplitude of the damper or the amplitude of the edge of the diaphragm, the height of the holder, that is, the depth of the speaker is reduced. It becomes possible. In addition, since the joint of the vibration system is located above and below the vibration position (voice coil), linearity of vibration can be ensured, and distortion is reduced.

[0008]

FIG. 1 is a sectional view of a repulsive magnetic field type speaker according to the present invention, showing magnets M1, M magnetized in the thickness direction.
2 are arranged so that the same poles face each other, and the magnets M1 and M2 are arranged so that a center plate P made of a magnetic material is sandwiched between opposing surfaces of the magnets M1 and M2.
A magnetic circuit portion is formed by the repulsive magnetic field of M2.

A voice coil 1 is disposed 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. 2 and the inner periphery of the damper 3 is fixed to the lower end of the voice coil bobbin 6. Thus, the coil portion 7 of the voice coil is located between the diaphragm 2 and the damper 3, and the coil portion 7 is reliably located outside the center plate P.

In the drawing, reference numeral 4 denotes a holder, which can be made extremely thin as is apparent from the drawing. Therefore, the depth of the whole speaker can be reduced, and the thickness and the size can be reduced. Reference numeral 5 denotes a frame, and the depth up to the bottom surface may be any depth that does not make contact with the damper 3 at the maximum amplitude of the damper 3. The coil part 7 is a voice coil bobbin 6
, The voice coil bobbin 6 has an upper end portion held by the diaphragm 2 and a lower end portion held by the damper 3, so that rolling during vibration does not occur and linearity can be secured. Is improved.

[0011]

According to the repulsion magnetic field type speaker according to the present invention, the inner periphery of the diaphragm is fixed to the upper end of the voice coil bobbin, and the inner periphery of the damper is fixed to the lower end of the voice coil bobbin. Therefore, since the coil portion of the voice coil is located between the diaphragm and the damper, the height from the upper end to the bottom of the frame is made larger than the amplitude of the damper or the amplitude of the edge of the diaphragm. , That is, the depth of the speaker can be reduced, and the characteristics of the repulsive magnetic field type speaker can be fully utilized. In addition, since the joint of the vibration system is located above and below the vibration position (voice coil), linearity of vibration can be ensured, and distortion can be reduced to improve performance.

[Brief description of the drawings]

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

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

FIG. 3 is a schematic sectional view of a main part of a conventional repulsion 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

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04R 9/04 105 H04R 9/02 102

Claims (1)

(57) [Claims] 1. A magnet (M) magnetized in the thickness direction.
1, M2) are arranged so that the same poles face each other, and the magnets (M1, M2) are arranged such that a center plate (P) made of a magnetic material is sandwiched between opposing surfaces of both magnets (M1, M2). 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 voice coil drives the diaphragm (2). ), The inner peripheral portion of the diaphragm (2) is fixed to the upper end portion, and the inner peripheral portion of the damper (3) is fixed to the lower end portion of the voice coil bombin (6). 7) is located between the diaphragm (2) and the damper (3).