JP6895246B2 - Trance and bobbin - Google Patents

Description

The present invention relates to transformers and bobbins.

Conventionally, in a bobbin with terminals formed of an insulating resin or the like that constitutes a transformer, a groove for pulling out an electric wire from a winding core is provided between each terminal. When automatic winding is performed on a bobbin with terminals, the terminal near the center of the bobbin with terminals is set as the carrage terminal that entangles the electric wire at the beginning of winding. After winding the bobbin with terminals in this way, the transformer is configured by incorporating the core.

Japanese Unexamined Patent Publication No. 08-064411 Japanese Unexamined Patent Publication No. 09-306759

Here, when the electric wire is automatically wound on the bobbin with a terminal, when the electric wire is drawn into the winding core from the carrage terminal, the electric wire is wired linearly from the fulcrum. It is necessary to pass an electric wire. Further, in the case of automatic winding, it is difficult to insulate the electric wire by covering it with a tube or the like, and it is necessary to pull the electric wire at the beginning of winding into the vicinity of the winding core in order to prevent contact between the electric wire at the beginning of winding and the electric wire in the outer layer. For this reason, the terminal at the start of winding of the automatic winding needs to be located near the center of the bobbin with a terminal, which is a major restriction in designing a transformer or a substrate. That is, in a transformer, there is a problem that the terminal position at the start of winding of a bobbin with a terminal cannot be freely set when performing automatic winding.

The disclosed technology of the present application has been made in view of the above, and an object of the present invention is to provide a transformer and a bobbin in which the terminal position at the start of winding of a bobbin with a terminal can be freely set when performing automatic winding. ..

In the disclosed technique of the present application, for example, in a transformer, an electric wire is wound around a winding core, and an electric wire is extended from two opposite peripheral portions at one of the flange portions provided at both ends of the winding core. Each of the installation parts has a bobbin provided with a plurality of terminals and a core arranged so as to surround the outer periphery of the bobbin. The extension portion includes a groove portion provided by a notch from the outer peripheral side to the winding core side of the extension portion between the plurality of terminals, and a plurality of terminal base portions separated by the groove portion. A first groove portion that separates a first terminal base provided with a first terminal having a maximum distance from the winding core among a plurality of terminal bases and a second terminal base adjacent to the first terminal base. The depth of cut is the deepest as compared with other groove portions, and the first terminal base portion has a slope portion on which an inclined portion is formed. The electric wire entwined with the first terminal provided at the first terminal base is pulled to the winding core so as to pass through the deepest part of the notch in the first groove portion by sliding along the inclined portion. .. The inclined portion is set so that the vertical distance between the first plane and the inclined portion along the surface facing the electric wire wound around the winding core of one of the flange portions becomes shorter as it approaches the first groove portion. In addition, the vertical distance between the line of intersection where the inclined portion intersects the third plane parallel to the second plane along which the first groove portion is along and the first plane becomes shorter as the distance from the winding core increases. doing.

According to the disclosed technology, for example, in a transformer, when performing automatic winding, the terminal position at the start of winding of the bobbin with a terminal can be freely set.

FIG. 1 is a perspective view of the transformer according to the embodiment as viewed from above right. FIG. 2 is an exploded perspective view showing the transformer according to the embodiment. FIG. 3 is a five-view view showing the transformer according to the embodiment. FIG. 4 is a cross-sectional view showing a cross section taken along the line AA'in FIG. 3 of the transformer according to the embodiment. FIG. 5 is a perspective view of the bobbin according to the embodiment as viewed from the upper left. FIG. 6 is a perspective view of the bobbin according to the embodiment as viewed from the lower left. FIG. 7 is a perspective view of the bobbin according to the embodiment as viewed from the lower right. FIG. 8 is a five-view view showing the bobbin according to the embodiment. FIG. 9 is a detailed view showing a portion of the bobbin according to the embodiment, which is indicated by reference numeral B in FIG. 8A. FIG. 10 is a detailed view showing a portion of the bobbin according to the embodiment, which is indicated by reference numeral C in FIG. 8 (c). FIG. 11 is a cross-sectional view showing a DD'cross section in FIG. 10 of the bobbin according to the embodiment. FIG. 12 is a bottom view showing the bobbin according to the first modification of the embodiment. FIG. 13 is a bottom view showing the bobbin according to the second modification of the embodiment.

Hereinafter, embodiments relating to the technique disclosed in the present application will be described with reference to the drawings. The following embodiments show an example of applying the disclosure technology to a vertical pin mounting type transformer used in a transformer for lighting equipment or a choke coil, but the present invention is merely an example, and the present invention is not limited to this. The disclosed technology is widely applicable to transformers in general. In addition, the embodiments and modifications shown below can be appropriately combined within a consistent range.

In the following description of the embodiment, the descriptions such as "upper", "lower", "left", "right", "front", "rear", "front", and "back" merely represent relative positions.

[Embodiment]
(Transformer according to the embodiment)
FIG. 1 is a perspective view of the transformer according to the embodiment as viewed from above right. FIG. 2 is an exploded perspective view showing the transformer according to the embodiment. FIG. 3 is a five-view view showing the transformer according to the embodiment. FIG. 4 is a cross-sectional view showing a cross section taken along the line AA'in FIG. 3 of the transformer according to the embodiment. FIG. 5 is a perspective view of the bobbin according to the embodiment as viewed from the upper left. FIG. 6 is a perspective view of the bobbin according to the embodiment as viewed from the lower left. FIG. 7 is a perspective view of the bobbin according to the embodiment as viewed from the lower right.

For convenience of explanation, "upper", "lower", "left", "right", "front", and "rear" of the transformer 1 (and the bobbin 2 described later) are defined as shown by the arrows shown in FIGS. 1 and 2.

Note that FIG. 3A is a front view of the transformer 1 according to the embodiment. FIG. 3B is a top view of the transformer 1. FIG. 3C is a bottom view of the transformer 1. FIG. 3D is a left side view of the transformer 1. FIG. 3 (e) is a right side view of the transformer 1. The rear view of the transformer 1 is symmetrical with the front view of the transformer 1, and is therefore omitted.

As shown in FIG. 1, the transformer 1 according to the embodiment has a bobbin 2, a winding 2a, a lower core 3a, an upper core 3b, and a core fixing tape 4. The bobbin 2 is made of an insulating resin or the like. The winding 2a is a conductive electric wire made of a material such as copper. The lower core 3a and the upper core 3b are made of a magnetic material having a high magnetic permeability or the like. The core fixing tape 4 is made of an insulating resin or the like.

Further, as shown in FIGS. 2 to 7, the bobbin 2 includes a winding core 21, a lower flange 22, a lower primary side regulating portion 22a, a primary side first terminal base portion 22a-1, and a primary side second terminal base portion. 22a-2, primary side third terminal base 22a-3, primary side fourth terminal base 22a-4, primary side first terminal 23a-1, primary side second terminal 23a-2, primary side first 3 terminal 23a-3, 1st side 4th terminal 23a-4, lower secondary side regulation part 22b, 2nd side 1st terminal base 22b-1, 2nd side 2nd terminal base 22b-2, 2nd side 1st 3 terminal base 22b-3, 2nd side 4th terminal base 22b-4, 2nd side 1st terminal 23b-1, 2nd side 2nd terminal 23b-2, 2nd side 3rd terminal 23b-3, 2nd It has a side fourth terminal 23b-4. The primary side is the P winding side, and the secondary side is the S winding side.

The winding core 21 has a hollow cylindrical shape, and the winding 2a is wound around the winding core 21. The hollow portion of the winding core 21 is a bobbin hole 27, and the middle foot 33a of the lower core 3a and the middle foot 33b of the upper core 3b, which will be described later, are inserted.

The lower flange 22 corresponds to one of the flanges at both ends of the bobbin 2 with respect to the winding core 21. The primary side first terminal base portion 22a-1 to the primary side fourth terminal base portion 22a-4 extend from the peripheral portion of the lower flange 22. The primary side first terminal bases 22a-1 to the primary side fourth terminal bases 22a-4 are provided with primary side first terminals 23a-1 to primary side fourth terminals 23a-4, respectively. ..

Both the lower primary side regulating portion 22a and the lower secondary side regulating portion 22b are provided perpendicular to the lower flange 22. The lower primary side regulating portion 22a and the lower secondary side regulating portion 22b are provided so as to face each other, and the back portion 31a of the lower core 3a fitted to these gaps is restricted from moving in this gap.

Further, the secondary side first terminal base portion 22b-1 extends from the peripheral portion of the lower flange 22 so as to be symmetrical with the primary side first terminal base portion 22a-1 with the lower flange 22 interposed therebetween. The secondary side second terminal base portion 22b-2 extends from the peripheral portion of the lower flange 22 so as to be symmetrical with the primary side second terminal base portion 22a-2 with the lower flange 22 interposed therebetween. The secondary side third terminal base portion 22b-3 extends from the peripheral portion of the lower flange 22 so as to be symmetrical with the primary side third terminal base portion 22a-3 with the lower flange 22 interposed therebetween. The secondary side fourth terminal base portion 22b-4 extends from the peripheral portion of the lower flange 22 so as to be symmetrical with the primary side fourth terminal base portion 22a-4 with the lower flange 22 interposed therebetween. The secondary side first terminal base 22b-1 to the secondary side fourth terminal base 22b-4 are provided with the secondary side first terminal 23b-1 to the secondary side fourth terminal 23b-4, respectively. ..

The upper flange 26 corresponds to the other end of the flanges at both ends of the bobbin 2 with respect to the winding core 21. The upper flange 26 has an upper primary side regulating portion 26a and an upper secondary side regulating portion 26b. Both the upper primary side regulating portion 26a and the upper secondary side regulating portion 26b are provided perpendicular to the upper flange 26. The upper primary side regulating portion 26a and the upper secondary side regulating portion 26b are provided so as to face each other, and the back portion 31b of the upper core 3b fitted to these gaps is restricted from moving in the gap.

The lower core 3a and the upper core 3b are a pair of E-shaped cores. The lower core 3a has a back portion 31a, an outer leg 32a, and a middle leg 33a. The upper core 3b has a back portion 31b, an outer leg 32b, and a middle leg 33b. The lower core 3a is a core in which the width dimension of the middle leg 33a is smaller than the width dimension of the outer leg 32a. Similarly, the upper core 3b is also a core in which the width dimension of the middle leg 33b is smaller than the width dimension of the outer leg 32b. In the lower core 3a and the upper core 3b, the width dimensions of the middle legs 33a and 33b are smaller than the width dimensions of the outer legs 32a and 32b. The first groove portion 24b-1 on the side (see FIG. 8C) is deeply cut to the vicinity of the winding core 21.

A winding 2a is wound around the bobbin 2, and a covering member (not shown) such as an insulating tape is wound around the outer circumference of the winding 2a to form a coil. In the transformer 1, the middle leg 33a of the lower core 3a and the middle leg 33b of the upper core 3b are inserted into the bobbin hole 27 of the bobbin 2 in which the winding 2a is wound along the XX axis of FIG. The core fixing tape 4 is wound around the lower core 3a and the upper core 3b in a state where the outer legs 32a and 32b and the middle legs 33a and 33b are in contact with each other with the 3a and the upper core 3b facing each other. To.

(Details of bobbin according to the embodiment)
FIG. 8 is a five-view view showing the bobbin according to the embodiment. FIG. 8A is a front view of the bobbin 2. FIG. 8B is a top view of the bobbin 2. FIG. 8C is a bottom view of the bobbin 2. FIG. 8D is a left side view of the bobbin 2. FIG. 8E is a right side view of the bobbin 2. The rear view of the bobbin 2 is symmetrical with the front view of the bobbin 2, and is therefore omitted.

As shown in FIGS. 8 (a), (c) to (e), the bobbin 2 extends from the lower flange 22 to the primary side first terminal base 22a-1, the primary side second terminal base. It has 22a-2, a primary side third terminal base 22a-3, and a primary side fourth terminal base 22a-4. The primary side first terminal base 22a-1, the primary side second terminal base 22a-2, the primary side third terminal base 22a-3, and the primary side fourth terminal base 22a-4 are examples of extension portions. Is. The primary side first terminal base portion 22a-1 has a primary side first terminal 23a-1 extending in the tubular axial direction of the tubular winding core 21. The primary side second terminal base portion 22a-2 has a primary side second terminal 23a-2 extending in the tubular axis direction of the winding core 21. The primary side third terminal base portion 22a-3 has a primary side third terminal 23a-3 extending in the tubular axis direction of the winding core 21. The primary side fourth terminal base portion 22a-4 has a primary side fourth terminal 23a-4 extending in the tubular axis direction of the winding core 21.

As shown in FIG. 8 (c), the bobbin 2 is restricted from the outside to the lower primary side between the primary side first terminal base 22a-1 and the primary side second terminal base 22a-2. It has a primary side first groove portion 24a-1 having a shape cut toward the portion 22a. Further, the bobbin 2 is cut from the outside toward the lower primary side regulating portion 22a between the primary side second terminal base portion 22a-2 and the primary side third terminal base portion 22a-3. It has a primary side second groove portion 24a-2 having a shape. Further, the bobbin 2 is cut between the primary side third terminal base portion 22a-3 and the primary side fourth terminal base portion 22a-4 from the outside toward the lower primary side regulating portion 22a. It has a primary side third groove portion 24a-3 having a shape.

In the primary side first groove portion 24a-1, the wire at the start of winding (the winding start portion of the lead wire of the primary side coil) entwined with the primary side first terminal 23a-1 is placed near the center of the winding core 21 of the bobbin 2. It is a groove for pulling in. Further, the primary side third groove portion 24a-3 is wound around the primary side fourth terminal 23a-4 from the outermost circumference of the primary winding of the winding 2a of the winding core 21 of the bobbin 2. This is a groove for pulling out the electric wire (the winding end portion of the lead wire of the primary coil) without contacting the primary winding. Therefore, as shown in FIG. 8C, the notch distance D1 of the primary side first groove portion 24a-1 and the notch distance D2 of the primary side second groove portion 24a-2, and the primary side third groove portion 24a Of the cut distances D3 of -3, the distance D1 is the longest and D3 is the shortest. By cutting the primary side first groove portion 24a-1 to the vicinity of the winding core 21 by a distance D1, it is possible to prevent the electric wire at the start of winding from coming into contact with the primary winding of the winding 2a. Further, by cutting the third groove portion 24a-3 on the primary side in the winding core 21 direction by a distance D3, it is possible to prevent the electric wire c at the end of winding from coming into contact with the primary winding of the winding 2a. ..

As shown in FIG. 8 (c), the front tip position (outer end surface) of the primary side fourth terminal base 22a-4 is compared with the front tip position of the primary side third terminal base 22a-3. It is offset to the rear by Δh in the plan view. That is, by providing a step on the left and right primary side third terminal bases 22a-3 and the primary side fourth terminal base 22a-4 of the lead-out groove at the end of winding, the winding core 21 to the primary side fourth terminal 23a- Since the creepage distance and the space distance up to 4 can be further shortened, the electric wire c at the end of winding can be easily pulled out from the winding core 21.

Similarly, as shown in FIG. 8C, the bobbin 2 extends below the winding core 21 and has a secondary side first terminal base 22b-1, a secondary side second terminal base 22b-. It has a secondary side third terminal base 22b-3 and a secondary side fourth terminal base 22b-4. The secondary side first terminal base portion 22b-1 has a secondary side first terminal 23b-1 extending in the tubular axial direction of the tubular winding core 21. The secondary side first terminal base 22b-1, the secondary side second terminal base 22b-2, the secondary side third terminal base 22b-3, and the secondary side fourth terminal base 22b-4 are examples of extension portions. Is. The secondary side second terminal base portion 22b-2 has a secondary side second terminal 23b-2 extending in the tubular axis direction of the winding core 21. The secondary side third terminal base portion 22b-3 has a secondary side third terminal 23b-3 extending in the tubular axis direction of the winding core 21. The secondary side fourth terminal base portion 22b-4 has a secondary side fourth terminal 23b-4 extending in the tubular axis direction of the winding core 21.

Further, as shown in FIG. 8C, the bobbin 2 is located between the secondary side first terminal base 22b-1 and the secondary side second terminal base 22b-2 from the outside to the lower secondary. It has a secondary side first groove portion 24b-1 having a shape cut toward the side regulation portion 22b. Further, the bobbin 2 is cut from the outside toward the lower secondary side regulating portion 22b between the secondary side second terminal base portion 22b-2 and the secondary side third terminal base portion 22b-3. It has a secondary side second groove portion 24b-2 having a shape. Further, the bobbin 2 is cut from the outside toward the lower secondary side regulating portion 22b between the secondary side third terminal base portion 22b-3 and the secondary side fourth terminal base portion 22b-4. It has a secondary side third groove portion 24b-3 that has a shape.

Here, as shown in FIG. 8C, the primary side first terminal base 22a-1 to the primary side fourth terminal base 22a-4, the primary side first terminal 23a-1 to the primary side first 4 terminals 23a-4, primary side 1st groove 24a-1 to primary side 3rd groove 24a-3, secondary side 1st terminal base 22b-1 to secondary side 4th terminal base 22b-4, secondary Position and shape of each element of the lower part of the bobbin 2 including the side first terminal 23b-1 to the secondary side fourth terminal 23b-4, the secondary side first groove portion 24b-1 to the secondary side third groove portion 24b-3. Is axisymmetric with respect to the YY axis.

The secondary side first groove portion 24b-1 connects the wire at the start of winding (the winding start portion of the lead wire of the secondary side coil) entwined with the secondary side first terminal 23b-1 to the primary winding 2a of the bobbin 2. It is a groove for pulling in to the vicinity of the outermost circumference of the winding. Further, the secondary side third groove portion 24b-3 is wound around the secondary side fourth terminal 23b-4 from the outermost circumference of the secondary winding of the winding 2a of the winding core 21 of the bobbin 2. This is a groove for pulling out the electric wire (the winding end portion of the lead wire of the secondary coil) without contacting the secondary winding. The notch distance of the secondary side first groove portion 24b-1 is the same as the above-mentioned distance D1, and the notch distance of the secondary side second groove portion 24b-2 is the same as the above-mentioned distance D2. The notch distance of the three groove portions 24b-3 is the same as that of D3 described above. By cutting the secondary side first groove portion 24b-1 to the vicinity of the winding core 21 by a distance D1, it is possible to prevent the electric wire c at the start of winding from coming into contact with the secondary winding of the winding 2a. Further, by cutting the third groove portion 24b-3 on the secondary side in the winding core 21 direction by a distance D3, it is possible to prevent the electric wire c at the end of winding from coming into contact with the secondary winding of the winding 2a. ..

Further, the rear tip position of the secondary side fourth terminal base 22b-4 is the same as that of the primary side third terminal base 22a-3 as compared with the rear tip position of the secondary side third terminal base 22b-3. The front end position of the primary side fourth terminal base portion 22a-4 is offset to the rear side by the same amount as the offset amount Δh. That is, the electric wire c at the end of winding is drawn out from the winding core 21 by providing a step on the left and right secondary side third terminal bases 22b-3 and the secondary side fourth terminal base 22b-4 of the lead-out groove at the end of winding. It will be easier.

(Details around the base of the 1st terminal on the primary side)
FIG. 9 is a detailed view showing a portion of the bobbin according to the embodiment, which is indicated by reference numeral B in FIG. 8A. FIG. 10 is a detailed view showing a portion of the bobbin according to the embodiment, which is indicated by reference numeral C in FIG. 8 (c). FIG. 11 is a cross-sectional view showing a DD'cross section in FIG. 10 of the bobbin according to the embodiment. In FIGS. 9 to 11, the primary side first terminal base portion 22a-1 will be described as a representative, but the same applies to the secondary side first terminal base portion 22b-1.

As shown in FIG. 9, the primary side first terminal base portion 22a-1 has a meat stealing portion 25-1 on the end surface s1 on the lead-in side of the electric wire c at the beginning of winding around the primary side first terminal 23a-1. That is, the meat stealing portion 25-1 is provided in the resin shape of the primary side first terminal base portion 22a-1 near the cutting position of the electric wire c at the start of winding. For example, when cutting the electric wire c at the beginning of winding entwined with the first terminal 23a-1 on the primary side, the tip of the cutting tool enters the meat stealing portion 25-1, so that the position p shown in FIG. 9 is obtained. The electric wire c can be cut at a position closer to the primary side first terminal 23a-1. Therefore, the cut end portion of the electric wire c can be accommodated inside the end surface s1 of the bobbin 2, that is, on the primary side first terminal 23a-1 side.

Further, as shown in FIGS. 9, 10 and 11, the primary side first terminal base portion 22a-1 is located between the primary side first terminal 23a-1 and the primary side first groove portion 24a-1. Has a slope portion 25-2. In the front view of the bobbin 2 as shown in FIG. 9, the slope portion 25-2 has a vertical distance with respect to the winding core 21 from the primary side first terminal 23a-1 to the primary side first groove portion 24a-1. It has a first inclined portion 25-2a that is shortened. Further, the slope portion 25-2 faces the end surface s2 on the front side of the primary side first terminal base portion 22a-1 from the primary side first terminal 23a-1 in the DD'cross section as shown in FIG. A second inclined portion 25-2b is provided so that the vertical distance with respect to the winding core 21 and the lower flange 22 becomes shorter. Due to the slope portion 25-2, the electric wire c at the start of winding has a height step with the winding core 21 of a predetermined amount or less in the vicinity of the deepest portion of the notch in the first groove portion 24a-1 on the primary side.

Further, as shown in FIGS. 10 and 11, the primary side first terminal base portion 22a-1 is located between the slope portion 25-2 and the lower primary side restricting portion 22a, and the primary side first terminal 23a-. A guide groove portion 25-3 is provided between the first groove portion 24a-1 on the primary side and the first groove portion 24a-1 on the primary side. Further, as shown in FIGS. 10 and 11, the primary side first terminal base portion 22a-1 extends from the slope portion 25-2 between the slope portion 25-2 and the guide groove portion 25-3. It has a surface portion 25-4.

Further, as shown in FIG. 10, the extended surface portion 25-4 has a guide groove portion 25-3 and a chamfered portion 25-4r in which the corner portion or the edge on the primary side first groove portion 24a-1 side is chamfered. .. Not limited to the chamfered portion 25-4r, the guide groove portion 25-3 and the corner portion or edge on the primary side first groove portion 24a-1 side may be rounded (rounded chamfered).

When the electric wire c entwined with the primary side first terminal 23a-1 is delivered to the winding core 21, the electric wire c extending from the primary side first terminal 23a-1 is the first of the slope portion 25-2. By sliding along the inclined portion 25-2a and the second inclined portion 25-2b, and the chamfered portion 25-4r, the cable easily passes through the deepest part of the notch in the first groove portion 24a-1 on the primary side. , It is easily stored in the guide groove 25-3. When the electric wire c is stored in the guide groove portion 25-3, it is smoothly stored by the chamfered portion 25-4r without being caught in the corner portion or the edge. Further, the electric wire c housed in the guide groove portion 25-3 is suppressed from moving to the outside of the guide groove portion 25-3.

According to the above embodiment, when the bobbin is automatically wound, the terminal position at the start of winding of the bobbin with a terminal can be set near the bobbin center and, for example, the position farthest from the bobbin center. Therefore, the design restrictions of transformers to which automatic winding can be applied are relaxed, and a wider variety of transformers can support automatic winding. Therefore, the manufacturing man-hours can be reduced and the manufacturing cost can be reduced. Further, since many transformers can be applied to the automatic winding in the manufacture of transformers, the quality of the transformers can be stably improved.

(Modified example of the embodiment)
In the embodiment, as shown in FIG. 8C, the primary side first terminal base 22a-1 to the primary side fourth terminal base 22a-4, the primary side first terminal 23a-1 to the primary side Fourth terminal 23a-4, primary side first groove portion 24a-1 to primary side third groove portion 24a-3, secondary side first terminal base portion 22b-1 to secondary side fourth terminal base portion 22b-4, 2 Positions of the lower elements of the bobbin 2 including the secondary side first terminal 23b-1 to the secondary side fourth terminal 23b-4, the secondary side first groove portion 24b-1 to the secondary side third groove portion 24b-3, and the position of each element. The shape is axisymmetric with respect to the YY axis. However, the positions and shapes of the lower elements of the bobbin 2 are not limited to the positions and shapes line-symmetrical with respect to the YY axis shown in FIG. 8 (c), and the center O of the cylinder of the bobbin hole 27 (FIG. 8 (FIG. 8). c) It may be a point-symmetrical position and shape with respect to).

Specifically, as shown in FIG. 12, the bobbin 2A according to the first modification is the secondary side first terminal base 22b-1, the secondary side second terminal base 22b-2, and the secondary side third. Terminal base 22b-3, secondary side 4th terminal base 22b-4, secondary side 1st terminal 23b-1, secondary side 2nd terminal 23b-2, secondary side 3rd terminal 23b-3, secondary side Instead of the fourth terminal 23b-4, the secondary side first terminal base 22b-1', the secondary side second terminal base 22b-2', the secondary side third terminal base 22b-3', and the secondary side second 4 terminal base 22b-4', secondary side first terminal 23b-1', secondary side second terminal 23b-2', secondary side third terminal 23b-3', secondary side fourth terminal 23b-4 May have a'.

Further, as shown in FIG. 13, the bobbin 2B according to the second modification is the primary side first terminal base 22a-1, the primary side second terminal base 22a-2, and the primary side third terminal base 22a. -3, primary side 4th terminal base 22a-4, primary side 1st terminal 23a-1, primary side 2nd terminal 23a-2, primary side 3rd terminal 23a-3, primary side 4th terminal Instead of 23a-4, the primary side first terminal base 22a-1', the primary side second terminal base 22a-2', the primary side third terminal base 22a-3', and the primary side fourth terminal base 22a-4', primary side first terminal 23a-1', primary side second terminal 23a-2', primary side third terminal 23a-3', primary side fourth terminal 23a-4' You may.

As described above, the bobbin 2A according to the first modification or the bobbin 2B according to the second modification has the position and shape of the winding start terminal of the bobbin 2B point-symmetrical with respect to the center of the winding core of the bobbin 2B. By using the shape and shape, when the bobbin 2B is set in the device for automatic winding, the bobbin is set correctly in the device without considering the orientation of the bobbin 2B, so that the efficiency of the automatic winding is improved. Can be done.

Alternatively, as another modification, the primary side first terminal base portion 22a-1 to the primary side fourth terminal base portion 22a-4 and the primary side first terminal 23a-1 to the primary side fourth in the above-described embodiment. Terminals 23a-4, primary side first groove portion 24a-1 to primary side third groove portion 24a-3 component group, secondary side first terminal base portion 22b-1 to secondary side fourth terminal base portion 22b -4, one of the constituent elements of the secondary side first terminal 23b-1 to the secondary side fourth terminal 23b-4, the secondary side first groove portion 24b-1 to the secondary side third groove portion 24b-3. The bobbin may be a bobbin in which the component group of the above is the same component group as that of the prior art (for example, see FIG. 2 of JP-A-08-064411). The component group similar to that of the prior art is, for example, a substantially rectangular parallelepiped protruding from the lower flange to the outside of the winding core, as shown in FIG. 2 of Japanese Patent Application Laid-Open No. 08-064411. It is a group of components including a plurality of terminals provided on the lower surface of a rectangular parallelepiped and a notch groove provided between the terminals.

The transformer 1 and the bobbins 2, 2A, and 2B according to the above-described embodiment may be integrated or dispersed as appropriate according to the design. Further, the transformer according to the disclosure technique also includes a transformer in which each part of the transformer 1 and the bobbins 2, 2A, and 2B according to the above-described embodiment and modified examples thereof is appropriately combined, replaced, or omitted.

1 Transformers 2, 2A, 2B Bobbin 2a Winding 3a Lower core 31a, 31b Back 32a, 32b Outer legs 33a, 33b Middle legs 3b Upper core 4 Core fixing tape 21 Winding core 22 Lower flange 22a Lower primary side regulating part 22b Lower Secondary side regulation part 22a-1, 22a-1'Primary side 1st terminal base 22a-2, 22a-2' Primary side 2nd terminal base 22a-3, 22a-3' Primary side 3rd terminal base 22a-4, 22a-4'Primary side 4th terminal base 22b-1, 22b-1' Secondary side 1st terminal base 22b-2, 22b-2' Secondary side 2nd terminal base 22b-3, 22b -3'Secondary side 3rd terminal base 22b-4, 22b-4' Secondary side 4th terminal base 23a-1, 23a-1' Primary side 1st terminal 23a-2, 23a-2' Primary side 2nd terminal 23a-3, 23a-3'Primary side 3rd terminal 23a-4, 23a-4' Primary side 4th terminal 23b-1, 23b-1' Secondary side 1st terminal 23b-2, 23b -2'Secondary side second terminal 23b-3, 23b-3'Secondary side third terminal 23b-4, 23b-4' Secondary side fourth terminal 24a-1 Primary side first groove 24a-2 1 Secondary side 2nd groove 24a-3 Primary side 3rd groove 24b-1 Secondary side 1st groove 24b-2 Secondary side 2nd groove 24b-3 Secondary side 3rd groove 25-1 Meat stealing part 25-2 Slope portion 25-2a First inclined portion 25-2b Second inclined portion 25-3 Guide groove portion 25-4 Extended surface portion 25-4r Chamfered portion 26 Upper flange 26a Upper primary side Regulatory portion 26b Upper secondary side Regulator 27 Bobbin hole

Claims (5)

An electric wire is wound around the winding core, and a plurality of terminals are provided on each of the extending portions extending from the two opposite peripheral portions on one of the flange portions provided at both ends of the winding core. With a bobbin
It has a core arranged so as to surround the outer circumference of the bobbin.
The extension part
Each of the plurality of terminals includes a groove portion provided by a notch from the outer peripheral side of the extension portion toward the winding core side, and a plurality of terminal base portions separated by the groove portion.
A first terminal base portion provided with a first terminal having a maximum distance from the winding core among the plurality of terminal base portions and a second terminal base portion adjacent to the first terminal base portion are separated from each other. The depth of the cut in the groove of 1 is the deepest as compared with the other grooves.
The first terminal base portion has a slope portion on which an inclined portion is formed.
The electric wire entwined with the first terminal provided at the first terminal base slides along the inclined portion so as to pass through the deepest portion of the notch in the first groove portion. Pulled to the core,
The inclined portion is
The vertical distance between the first plane along the surface of the one flange portion that faces the electric wire wound around the winding core and the inclined portion becomes shorter as it approaches the first groove portion. ,And,
The vertical distance between the line of intersection where the inclined portion intersects the third plane parallel to the second plane along which the first groove portion is along and the first plane becomes shorter as the distance from the winding core increases. ,
Inclined transformer. The first terminal base is
A guide groove portion for accommodating the electric wire entwined with the first terminal and drawn to the winding core is further provided in a portion from the first terminal to the deepest portion of the notch in the first groove portion. The transformer according to claim 1. The first terminal base is
The transformer according to claim 1 or 2, further comprising a meat stealing portion provided at a portion corresponding to a cutting position of the electric wire entwined with the first terminal. Of the plurality of terminal bases, the third terminal base provided with the third terminal for entwining the electric wire drawn from the winding core is the fourth terminal base adjacent to the third terminal base. The transformer according to any one of claims 1 to 3, wherein the end surface on the outer peripheral side of the extended portion is offset toward the winding core side as compared with the above. An electric wire is wound around the winding core, and a plurality of terminals are provided on each of the extending portions extending from the two opposite peripheral portions on one of the flange portions provided at both ends of the winding core. Also, it is a bobbin used for transformers.
The extension part
Each of the plurality of terminals includes a groove portion provided by a notch from the outer peripheral side of the extension portion toward the winding core side, and a plurality of terminal base portions separated by the groove portion.
A first terminal base portion provided with a first terminal having a maximum distance from the winding core among the plurality of terminal base portions and a second terminal base portion adjacent to the first terminal base portion are separated from each other. The depth of the cut in the groove of 1 is the deepest as compared with the other grooves.
The first terminal base portion has a slope portion on which an inclined portion is formed.
The electric wire entwined with the first terminal provided at the first terminal base slides along the inclined portion so as to pass through the deepest portion of the notch in the first groove portion. Pulled to the core,
The inclined portion is
The vertical distance between the first plane along the surface of the one flange portion that faces the electric wire wound around the winding core and the inclined portion becomes shorter as it approaches the first groove portion. ,And,
The vertical distance between the line of intersection where the inclined portion intersects the third plane parallel to the second plane along which the first groove portion is along and the first plane becomes shorter as the distance from the winding core increases. ,
A slanted bobbin.

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