JP4359297B2 - Coil winding method, coil and oscillating voice coil motor provided with the coil - Google Patents

Description

  The present invention relates to a coil winding method and a coil manufactured by using the method, and further relates to an oscillating voice coil motor including the coil.

  3A and 3B schematically show a general outer shape of a coil (air-core coil) with a part cut away, and the coils 11 and 12 have a square cross-section. All lines (all sides) constituting the outer shape are constituted by straight lines.

  FIG. 4 shows a winding method when such coils 11 and 12 are manufactured using a winding jig. The winding jig includes a winding frame 31 around which the winding material 21 is wound, The pair of side plates 32 are attached to both ends of the winding frame 31 so as to form a flange shape.

  The winding of the winding material 21 around the winding frame 31 starts winding from one end side of the winding frame 31 and advances in turn until reaching the other end of the winding frame 31 as shown by the arrow in FIG. Next, the second layer is generally wound by a method in which the second layer is wound in the opposite direction to the first layer. Thereafter, the coil is completed by being wound by a predetermined number of layers (number of turns).

  On the other hand, the coil is not limited to one having a cross-sectional outline as shown in FIGS. 3A and 3B, but may have a cross-sectional shape as shown in FIG. 3C, for example. The coil 13 shown in FIG. 3C is wound so that the winding material forms a frame shape, and the cross-sectional shape in the coil winding width direction (shown by being surrounded by a broken line in the drawing) at a pair of opposite sides of the frame. The inner surfaces 13a and 13b facing each other are concentric cylindrical surfaces.

  The coil 13 having such a shape is used, for example, in an oscillating voice coil motor and is positioned in a magnetic gap having an arcuate section formed by a permanent magnet having an arcuate section and a yoke facing the magnet. It is assumed to rotate within the gap.

  FIG. 5 shows a state in which the coil 13 shown in FIG. 3C is manufactured using a winding jig. In this example, the winding frame 33 of the winding jig has a shape in the coil winding width direction. The arc shape is such that the center is convex.

  In this case, similarly to the case of FIG. 4, when the winding material 21 starts to wind from one end side of the winding frame 33 and advances, the winding material 21 slides down as shown by the arrow f at the place where the winding material 21 is inclined downward after passing through the center. Therefore, it is impossible to wind in order, and the winding work becomes very difficult.

  As a solution for solving such a problem (collapse), a method has been proposed in which an adhesive material is attached to the winding frame 33 and the winding work is performed while the winding material 21 is attached to the adhesive material. ing.

  As another method, for example, a groove corresponding to the outer shape of the winding material 21 may be provided in the winding frame 33 as in the configuration in which a groove is provided in the winding portion of the coil bobbin described in Patent Document 1.

FIG. 6 shows a state in which a plurality of grooves 34 are formed in the winding frame 33 and the winding material 21 is wound around the winding frame 33. By providing such grooves 34, FIG. It is possible to prevent the winding material 21 from slipping down as shown.
Japanese Patent Laid-Open No. 9-223639

  However, in the method of forming the groove 34 on the surface of the winding frame 33 as described above, a processing cost for the groove processing is required, and the winding jig becomes expensive accordingly. Further, for example, when the wire diameter of the winding material 21 is thin, the tip of the crest portion between the grooves 34 becomes sharp and causes damage to the winding material 21. It is necessary to perform high-precision processing that does not, and further processing costs are required.

  On the other hand, in the method using an adhesive material, the adhesive strength of the adhesive material decreases every time it is used. Therefore, in order to always perform the winding work under the same conditions, maintenance is performed every time the winding jig is used. It is necessary and complicated.

  Although the coil is finally removed from the winding jig, there is a disadvantage that the removal method becomes difficult due to the presence of the groove 34 and the presence of the adhesive material.

  In view of such a situation, the object of the present invention is simpler and cheaper than the conventional coil winding with respect to a winding frame in which the shape in the coil winding width direction is an arc shape whose center is convex. It is another object of the present invention to provide a winding method that enables high quality winding, and to provide an inexpensive coil manufactured by using the method.

  According to the coil winding method according to the present invention, the winding material is started to be wound from one end side of the winding frame with respect to the winding frame whose shape in the coil winding width direction is an arc shape whose center is convex. The winding is advanced to the center, and then the winding is advanced from the other end side of the winding frame toward the center to finish winding the first layer.

  In the coil according to the present invention, the winding material is wound so as to form a frame shape, and the cross-sectional shape in the coil winding width direction of a pair of sides facing each other of the frame is such that the centers thereof are convex outward. The first layer of the arc-shaped portion is wound from one end in the coil winding width direction to the center, and then from the other end in the coil winding width direction toward the center. It is assumed that it is formed by being rolled up.

  According to the coil winding method of the present invention, it is only necessary to change the winding method without attaching an adhesive material to the winding frame or performing groove processing, and the shape in the coil winding width direction is convex in the center. Thus, the winding work for the arcuate winding frame can be performed easily, inexpensively and with higher quality.

  Further, the coil according to the present invention is manufactured by using the winding method as described above, so that an inexpensive coil can be provided.

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an embodiment of a coil winding method according to the present invention in the order of steps, and parts corresponding to those in FIG.

  The shape of the winding frame 33 in the coil winding width direction is an arc shape in which the center is convex, and winding is performed on the winding frame 33 in the following procedures (1) to (5). .

  (1) The winding material 21 starts to be wound from one end side of the winding frame 33, and is sequentially wound up to the center (the apex of the arc shape) as indicated by an arrow a.

  (2) After winding to the center, the winding material 21 is moved from the center to the other end side of the winding frame 33, that is, on the opposite side to the start of winding, as indicated by the arrow b, and 21 is wound. The movement of the winding material 21 is performed on the side surface of the winding frame 33 as shown in the perspective view of FIG. 1B, that is, the transition portion of the winding material 21 is positioned on the side surface that is a flat surface.

  (3) Wind the winding material 21 toward the center as shown by the arrow c. The winding material 21 is sequentially wound up to the center, and the winding work for the first layer is completed without causing collapse.

  (4) The second layer moves the winding material 21 to the end (the other end side) of the winding frame 33 as indicated by the arrow d, and starts winding from this position.

  (5) Then, as shown by the arrow e, the winding material 21 is sequentially wound up to the opposite side (one end side) of the winding frame 33, and the winding work of the second layer is completed. The second and subsequent layers are wound in the same manner as in the prior art, and the winding operation is completed after a predetermined number of layers (number of turns) have been wound.

  After the winding work is completed, the coil is fixed and the coil is completed. For example, the coil is fixed by, for example, using a winding material having a thin adhesive (adhesive) applied to its surface as the winding material 21 and heating it to melt and fix it after the winding operation is completed. Done. After fixing, the coil is removed from the winding jig.

  According to the winding method described above, the winding work for the winding frame whose arc winding shape is such that the center of the coil winding width method is convex is made to adhere an adhesive material to the winding frame, or This can be performed simply and with high quality without providing a groove in the winding frame.

  In addition, as a result, the winding material is wound so as to form a frame shape, and the cross-sectional shape in the coil winding width direction of the pair of sides facing each other of the frame is such that the center is convex toward the outside. A coil having an arc shape can be provided at low cost.

  In FIG. 2, the winding material is wound so as to form a frame shape as described above, and the cross-sectional shape in the coil winding width direction on a pair of opposite sides of the frame is convex toward the outside. The arc 41 is illustrated as an example of the coil 41 used in the oscillating voice coil motor.

  In the oscillating voice coil motor, a coil 41 is positioned in a magnetic gap having an arcuate cross section formed between a permanent magnet having an arcuate cross section and a yoke facing the permanent magnet. A force is generated by the interaction with the coil 41, and a swinging motion is obtained by the rotation of the coil 41. If this coil 41 is manufactured using the winding method shown in FIG. Accordingly, the oscillating voice coil motor can be configured at low cost.

The figure for demonstrating one Example of the winding method of the coil by this invention. The perspective view which shows an example of the coil used for a rocking | fluctuation type voice coil motor. The figure which shows the shape of various coils (air core coil). The figure for demonstrating the general winding method of a coil. The figure for demonstrating the malfunction at the time of coil winding in case the shape of the coil winding width direction of a winding frame is circular arc shape. The figure which shows the mode of coil winding at the time of providing a groove | channel in a winding frame.

Claims (4)

The coil winding method is a winding method of a coil with respect to a winding frame in which the shape in the coil winding width direction is an arc shape whose center is convex,
Winding the winding material, starting from one end of the winding frame and proceeding to the center, and then winding toward the center from the other end of the winding frame to finish winding the first layer. Line method. The coil winding method according to claim 1,
The second layer starts winding from the other end side or one end side of the winding frame. The winding material is wound so as to form a frame shape, and the cross-sectional shape in the coil winding width direction on a pair of opposite sides of the frame is an arc shape whose centers are convex outward. A coil,
The first layer of the arc-shaped portion is wound from the other end in the coil winding width direction toward the center after the winding material is wound from one end in the coil winding width direction to the center. A coil that is formed. In an oscillating voice coil motor that includes a permanent magnet and a coil, and is configured to generate a force by the interaction between a magnetic flux generated by the permanent magnet and a coil positioned in a magnetic gap through which the magnetic flux passes,
An oscillating voice coil motor, wherein the coil according to claim 3 is used as the coil.

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