JP2006352590A - Speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a speaker unit which has no magnetic substance between two magnets and utilizes a rebounding magnetic field, to be reduced in cost and equipped with an effective and sufficient magnetic flux distribution so as to display the desired properties. <P>SOLUTION: The speaker unit is provided with an adjusting mechanism 5 to adjust a space distance between the two magnets 2a and 2b which are opposed to each other so as to make their same polarities confront. The magnet 2a and/or magnet 2b of the adjusting mechanism 5 is screwed into a screw shaft 6 of non-magnetic material so as to adjust a space distance between the two magnets 2a and 2b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a speaker, and in particular, a speaker unit using a repulsive magnetic field without a magnetic material between two magnets can have an effective and sufficient magnetic flux distribution for obtaining desired characteristics. It relates to a possible speaker.

For example, the following speakers are known as conventional speakers. This prior art forms a magnetic circuit by repulsive magnetism by sandwiching a plate made of a magnetic material such as iron between two magnets with the same poles facing each other, and a repulsive magnetic field obtained on the outer periphery of the plate. In a speaker in which a voice coil is arranged, the plate is formed by joining a plurality of plate pieces to form a hollow portion inside the plate, and the volume of the hollow portion is increased, and a repulsive magnetic circuit Weight reduction of the whole structure part is aimed at (for example, refer to patent documents 1).
JP-A-6-327094 (second page, FIG. 1).

  In the prior art described in Patent Document 1, a plate made of a magnetic material such as iron is interposed between two magnets having the same poles opposed to each other, and a hollow portion is formed inside the plate. It is configured by joining a plurality of plate pieces. However, if a plate made of a magnetic material is interposed between two magnets, and the plate is formed by joining a plurality of plate pieces, the number of parts increases and the number of assembly steps increases, resulting in high costs. Become.

  Therefore, for a speaker unit using a repulsive magnetic field that does not have a magnetic material between two magnets, a technical problem to be solved in order to ensure effective and sufficient magnetic flux distribution to obtain desired characteristics and to reduce costs. The present invention aims to solve this problem.

  The present invention has been proposed to achieve the above object, and the invention according to claim 1 is characterized in that a voice coil is disposed in a repulsive magnetic field formed by making the same poles of two magnets face each other. A speaker having an adjustment mechanism for arbitrarily adjusting a spatial distance between the two magnets is provided.

  According to this configuration, by adjusting the distance between two magnets for a repulsive magnetic field speaker unit, the magnetic flux for outputting desired speaker characteristics without interposing a magnetic material between the two magnets. It is possible to adjust the distribution.

  According to a second aspect of the present invention, the adjusting mechanism is capable of adjusting a spatial distance between the two magnets on at least one of the two magnets on a screw shaft made of a nonmagnetic material standing on the frame. Provided is a speaker having a configuration screwed onto the speaker.

  According to this configuration, the magnet moves on the screw shaft by appropriately rotating at least one magnet screwed to the screw shaft made of a non-magnetic material in the left direction or the right direction, The distance between the two magnets is adjusted. The two magnets are fixed on the screw shaft by the repulsive force between the two magnets at the adjustment position.

  According to a third aspect of the present invention, there is provided a speaker in which the distance between the two magnets is adjusted to a required distance and then the distance between the two magnets is fixed with a resin.

  According to this structure, between two magnets is fixed with resin, between these two magnets is reliably hold | maintained in the state adjusted to the desired distance. The fixing between the two magnets by resin may be performed after the two magnets are incorporated into the speaker unit and adjusted to a desired distance. Further, when optimum distance data between two magnets has already been obtained for the same type of magnet, it may be performed before incorporation into the speaker unit.

  According to a fourth aspect of the present invention, there is provided a speaker in which the voice coil is directly bonded to a portion to be a diaphragm.

  According to this configuration, the voice coil is directly bonded to the portion to be the diaphragm and is disposed in the repulsive magnetic field adjusted to a desired magnetic flux distribution. When a voice current flows through the voice coil, the voice coil vibrates according to the magnetic flux distribution and the value of the voice current, and the vibration is transmitted to the diaphragm to reproduce a sound having a desired characteristic.

  According to the first aspect of the present invention, since an adjustment mechanism for arbitrarily adjusting the spatial distance between the two magnets is provided, desired speaker characteristics can be obtained for a speaker unit using a repulsive magnetic field without a magnetic material between the two magnets. Effective and sufficient magnetic flux distribution can be obtained. Further, by not using a magnetic material plate or the like between the two magnets, there is an advantage that the number of parts is reduced, the assembly is facilitated, and the cost can be reduced.

  According to a second aspect of the present invention, the adjusting mechanism is capable of adjusting a spatial distance between the two magnets on at least one of the two magnets on a screw shaft made of a nonmagnetic material standing on the frame. In addition to the effect of the invention described in claim 1, the advantage is that the spatial distance between the two magnets can be accurately adjusted by the adjustment mechanism having a simple configuration with a small number of parts. There is.

  In the invention described in claim 3, since the distance between the two magnets is adjusted to a required distance and then the gap between the two magnets is fixed with a resin, in addition to the effect of the invention described in claim 1 or 2, a desired It is possible to reliably hold the two magnets that are effective for obtaining the speaker characteristics and adjusted to have a sufficient magnetic flux distribution in this state. Also, if the optimal distance data between two magnets has already been obtained for the same type of magnet, the distance adjustment mechanism must be installed when the resin is fixed between the two magnets before installation into the speaker unit. There is no need to incorporate it into the speaker unit, and in this respect as well, there is an advantage that further cost reduction can be achieved.

  In the invention described in claim 4, since the voice coil is directly bonded to the portion to be the diaphragm, in addition to the effect of the invention described in claim 1, 2, or 3, the bobbin for winding the coil is unnecessary. Thus, there is an advantage that further cost reduction can be achieved.

For the purpose of reducing the cost by giving effective and sufficient magnetic flux distribution to obtain the desired characteristics for the speaker unit using repulsive magnetic field without magnetic material between the two magnets. A speaker in which a voice coil is arranged in a repulsive magnetic field formed so as to face each other is provided with an adjustment mechanism for arbitrarily adjusting the spatial distance between the two magnets, and the adjustment mechanism stands on the frame. At least one of the two magnets is movably screwed to a screw shaft made of a non-magnetic material, and a spatial distance between the two magnets can be adjusted. This was realized by directly bonding to the part.

  The best mode of the present invention is characterized in that an adjustment mechanism for arbitrarily adjusting the distance between two magnets having the same poles facing each other is provided. The two magnets are fixed with a non-magnetic screw so that a required space is provided between them. In this case, a magnetic flux distribution sufficient for producing sound characteristics of the speaker unit is provided without placing a magnetic body between the two magnets. As a method for attaching the voice coil, a synthetic resin is directly bonded to a portion to be a diaphragm of the speaker.

  The gap between the magnets can be appropriately adjusted by fixing the magnets with screws. Moreover, the magnet which forms a repulsive magnetic field is reliably fixed by screw fixation. Furthermore, an effective magnetic flux can be obtained without arranging a magnetic body between the magnets. Then, by not using a magnetic material between the magnets, and by directly bonding the voice coil to the diaphragm, the number of parts as a speaker unit can be reduced, and the product cost can be greatly reduced. Further, by reducing the number of parts, the man-hours for assembling the speaker system can also be reduced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, the configuration of the speaker according to the present embodiment will be described. FIG. 1 is a cross-sectional view with one half side omitted. Two magnets 2a and 2b are arranged in the center of the frame 1 so that the same poles face each other. There is no magnetic material as described in the prior art between the two magnets 2a and 2b, and there is a space between the two magnets 2a and 2b.

  A voice coil 3 is arranged in a repulsive magnetic field formed by the two magnets 2a and 2b. The voice coil 3 is directly bonded to the portion to be the diaphragm 4 with resin or the like. A peripheral portion of the diaphragm 4 is fixed to an upper peripheral portion of the frame 1 via an edge 4a.

  In the present embodiment, in the speaker having the above-described configuration, in order to obtain a repulsive magnetic field having a required magnetic flux distribution without interposing a magnetic body between the two magnets 2a and 2b facing the same poles, An adjusting mechanism 5 for arbitrarily adjusting the spatial distance d between the two magnets 2a and 2b is provided.

  A specific configuration of the adjusting mechanism 5 will be described. A screw hole is formed in each central portion of the two magnets 2a and 2b, and a female screw is formed on the inner wall of the screw hole. On the other hand, a screw shaft 6 made of a non-magnetic material is erected by screwing or the like at the center of the frame 1, and the two magnets 2a and 2b are connected to the screw shaft 6 between the two magnets 2a and 2b. The space distance d is screwed so as to be adjustable.

  Next, the adjustment and operation of the speaker configured as described above will be described. The two magnets 2a, 2b screwed to the screw shaft 6 or either one of the magnets 2a, 2b are appropriately rotated leftward or rightward to rotate the magnets 2a, 2b, Alternatively, 2a or 2b moves on the screw shaft 6, and the distance d between the two magnets 2a and 2b is adjusted with high accuracy.

As a result of this adjustment, a repulsive magnetic field that is effective for providing desired speaker characteristics and has a sufficient magnetic flux distribution can be obtained without interposing a magnetic material between the two magnets 2a and 2b. FIG. 2 shows an example of a repulsive magnetic field having an effective and sufficient magnetic flux distribution B obtained as a result of this adjustment. The two magnets 2a and 2b are fixed on the screw shaft 6 by the repulsive force between the two magnets 2a and 2b at the adjustment position.

  When a voice current flows through the voice coil 3 and the speaker is driven, the voice coil 3 vibrates according to the effective and sufficient magnetic flux distribution and the value of the voice current, and the vibration is applied to the diaphragm 4. The sound having the desired speaker characteristics is reproduced.

  FIG. 3A shows a state in which the distance between the two magnets 2a and 2b is adjusted to a required distance, and then the distance between the two magnets 2a and 2b is fixed with a resin 7. FIG. By fixing the gap between the two magnets 2a and 2b with the resin 7, the distance between the two magnets 2a and 2b is adjusted to a desired distance, and thereafter, the two magnets 2a and 2b are securely held in the adjusted state.

  The fixing between the two magnets 2a and 2b with the resin 7 may be performed after the two magnets 2a and 2b are incorporated in a speaker unit and adjusted to a desired distance. Further, when the optimum distance data between the two magnets 2a and 2b has already been obtained for the same type of magnet, it may be performed before incorporation into the speaker unit. Furthermore, when the two magnets 2a and 2b are fixed before being incorporated into the speaker unit, they may be fixed using a case-shaped frame 8 as shown in FIG.

  As described above, in the speaker according to the present embodiment, the spatial distance between the two magnets 2a and 2b can be accurately adjusted by the adjusting mechanism 5 having a simple configuration with a small number of parts.

  An effective and sufficient magnetic flux distribution for obtaining desired speaker characteristics can be provided to a speaker unit using a repulsive magnetic field without a magnetic material between the two magnets 2a and 2b.

  By not using a magnetic plate or the like between the two magnets 2a and 2b, the number of parts can be reduced and the cost can be reduced.

  After adjusting the distance between the two magnets 2a, 2b to a required distance, the gap between the two magnets 2a, 2b is fixed with resin 7, so that an effective and sufficient magnetic flux distribution for obtaining desired speaker characteristics can be obtained. Thereafter, the gap between the two magnets 2a and 2b adjusted to have can be reliably held.

  When the fixing between the two magnets 2a and 2b with the resin 7 or the case-shaped frame 8 is performed before the speaker unit is assembled, it is not necessary to incorporate the adjusting mechanism 5 into the speaker unit, thereby reducing the cost. be able to.

  Further, by directly bonding the voice coil 3 to a portion that becomes the diaphragm 4, a coil winding bobbin or the like is unnecessary, and the cost can be reduced.

  The present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

The figure shows a speaker according to an embodiment of the present invention.
Sectional drawing which abbreviate | omits and shows one half side. Explanatory drawing which shows the example of a repulsive magnetic field formed of the two magnets in which the spatial distance was adjusted. It is explanatory drawing which shows the example of fixation between the two magnets adjusted to the required distance, (a) shows fixation by resin, (b) shows fixation by a case-shaped frame.

Explanation of symbols

1 Frame 2a, 2b Magnet 3 Voice coil 4 Diaphragm 5 Adjustment mechanism 6 Screw shaft 7 Resin

Claims (4)

In a speaker in which a voice coil is arranged in a repulsive magnetic field formed by facing the same poles of two magnets,
A speaker comprising an adjusting mechanism for arbitrarily adjusting a spatial distance between the two magnets.   The adjustment mechanism has a configuration in which at least one of the two magnets is screwed onto a screw shaft made of a nonmagnetic material standing on a frame so that a spatial distance between the two magnets can be adjusted. The speaker according to claim 1.   3. The speaker according to claim 1, wherein the distance between the two magnets is adjusted to a required distance, and then the distance between the two magnets is fixed with a resin. 4. The speaker according to claim 1, wherein the voice coil is directly bonded to a portion to be a diaphragm.

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