JP3800762B2 - Electromagnetic equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic device such as a discharge lamp stabilizer such as a transformer or a choke provided in a fluorescent lamp lighting apparatus.
[0002]
[Prior art]
In the discharge lamp ballast, as shown in FIG. 11 and FIG. 13, a coil 3 formed by winding primary and secondary conductors (copper wires) 2a and 2b around a bobbin 1 made of synthetic resin, and this It is known that a transformer body having a first iron core 4 penetrating the coil 3 and a square-frame-like second iron core 5 which is disposed inside and forms a closed magnetic path together with the first iron core 4 is known. It has been. Both the iron cores 4 and 5 are formed by laminating a large number of iron core plates. As shown in FIG. 12 and the like, the second iron core 5 has a pair of joint recesses 6 on its inner surface, and a pair of magnetic leakage leaking projections 7 located on the inner surface between these recesses 6. Have.
[0003]
The first iron core 4 to which the coil 3 is attached presses both ends 4a in the longitudinal direction with a pair of pressurizing tools 8 (only one is shown in FIG. 11) of the press-fitting machine, thereby joining the both ends 4a. It press-fits into the recess 6 and is combined with the second iron core 5.
[0004]
In order to facilitate the press-fitting, as shown in FIG. 11, a first tapered surface 9 that continuously reduces the width dimension of the flanges 1 a to 1 d on both end surfaces in the width direction of the flanges 1 a to 1 d of the bobbin 1. 14 and 15, as shown in FIGS. 14 and 15, on the outer surface of the flanges 1a and 1d positioned on the end 4a side, the thickness of these flanges 1a and 1d is continuously reduced. Two tapered surfaces 10 are respectively provided.
[0005]
[Problems to be solved by the invention]
by the way, FIG. 13 (B) As shown in FIG. 5, the distance L1 between the outer surfaces of the flanges 1a to 1d is designed to be small by providing a predetermined clearance with respect to the distance L2 between the inner surfaces of the second core 5 where the joint recesses 6 are provided. This design takes into account the following defects.
[0006]
That is, when the distance L1 becomes slightly larger than the distance L2 due to manufacturing variations of the bobbin 1, the end portion of the first iron core 4 is brought about by press-fitting the first iron core 4 into the second iron core 5. Since the flanges 1a to 1d having a strength lower than that of the second iron core 5 are scraped by the joint recess 6, the bases of the flanges 1a to 1d may be cracked. In addition, the shaving is individually performed by the laminated iron core plates forming the second iron core 5, and the pressurizing tool 8 receives the reaction force from the bobbin 1 at that time. Since vibration is generated and the joint surface between the joint recess 6 and the end surface of the first iron core 4 is roughened, the magnetic coupling between the iron cores 4 and 5 may be lowered.
[0007]
For the same reason, FIG. 13 (B) As shown in FIG. 5, the width W1 of each of the flanges 1a to 1d is also designed to be smaller by providing a predetermined clearance than the width W2 between the inner surfaces of the second iron core 5.
[0008]
Since the second taper surface 10 provided on the flanges 1a and 1d using its thickness cannot increase the taper angle, the conductors 2a and 2b are connected to the bobbin on the second taper surface 10. 1 cannot absorb the variation in the deformation amount of the flanges 1a and 1d due to the variation in the tension when wound around the wire 1, and cannot fully absorb the variation in the positioning of the first iron core 4. Combined with this, the first iron core 4 is positioned in the longitudinal direction when the first iron core 4 is press-fitted inside the second iron core 5 by the longitudinal clearance generated by the relationship of the distance L1 <distance L2. As shown in FIG. 15, it is inclined in the longitudinal direction so that the height positions of both ends 4a are different, in other words, in a state where the parallelism of the first iron core 4 with respect to the second iron core 5 is out of order, There is a high possibility that the first iron core 4 is press-fitted inside the second iron core 5.
[0009]
When such press-fitting is performed, not only the joint surfaces of both iron cores 4 and 5 are damaged and roughened, but also the first iron core 4 is deformed and press-fitting is performed. In many cases, the magnetic coupling is impaired, the electrical characteristics greatly vary, and there is a problem in quality.
[0010]
Similarly, it is difficult to position the first iron core 4 in the width direction when the first iron core 4 is press-fitted inside the second iron core 5 due to the widthwise clearance generated by the relationship of the width W1 <W2. The first iron core 4 is press-fitted in a state where the first iron core 4 is inclined in the width direction so that the height positions at both ends in the width direction are different, in other words, the parallelism of the first iron core 4 with respect to the second iron core 5 is out of order. There is a high possibility. Even when such press-fitting is performed, the magnetic coupling between both the iron cores 4 and 5 is impaired as in the case described above, and the electrical characteristics greatly vary, which often causes a problem in quality.
[0011]
Therefore, the first problem to be solved by the present invention is to obtain an electromagnetic device capable of improving the quality by improving the magnetic coupling between the first iron core and the second iron core to which the iron core is press-fitted. It is in.
[0012]
[Means for Solving the Problems]
The present invention includes a coil in which a conductor is wound around a bobbin made of synthetic resin, Formed by laminating a plurality of iron core plates A first iron core that penetrates the coil; It is formed by laminating a plurality of square frame-shaped iron core plates, There are a plurality of joint recesses on the inner surface, and the joint ends of the first iron core are in these recesses. In the thickness direction It is press-fitted and this first iron core is arranged inside and a closed magnetic circuit is formed together with the first iron core. A second iron core to be formed, the joint end of the first iron core has a joint end surface formed by an arc surface, and the joint recess has an arc shape corresponding to the shape of the joint end portion. Formed with an indentation Assumes electromagnetic equipment.
[0013]
And in order to solve the said 1st subject, invention of Claim 1 respond | corresponds to the said joint recessed part in the outer surface of the flange arrange | positioned among the flanges with which the said bobbin is equipped at the joining edge part side of the said 1st iron core. The projecting convex portion is projected, and the convex portion is tapered in the press-fitting direction. In addition, the tapered surface of the introduction convex portion is a convex curved surface, and the introduction convex portion is continuous with the joint end portion. Is.
[0014]
In the invention of claim 1, when the first iron core is press-fitted inside the second iron core at the time of assembly, the joint end portion of the first iron core comes into contact with the joint recess of the second iron core, and press-fitting starts. The introduction convex portions of the flanges are respectively inserted into the joint concave portions, and the pair of introduction convex portions pass through the joint concave portions while sliding the taper surfaces thereof on the inner surfaces of the joint concave portions. Therefore, since the guide action by such contact is obtained and the inclination of the first iron core in the longitudinal direction with respect to the second iron core is prevented, the joint end portion of the first iron core is secured while ensuring the parallelism of the first iron core with respect to the second iron core. It can be introduced into a pair of joint recesses of the second iron core, and press-fitting of the entire first iron core can be started inside the second iron core.
[0015]
Furthermore, during the assembly When the tapered surface formed of a convex curved surface passes while sliding on the inner surface of the joint recess and introduces the joint end of the first iron core into the joint recess, respectively. As already mentioned While preventing the inclination of the 1st core with respect to the 2nd core in the longitudinal direction, the inclination of the width direction of the 1st core with respect to the 2nd core is also controlled, and the parallelism of the 1st core with respect to the 2nd core is guaranteed. The press-fitting can be started.
[0016]
In order to solve the first problem, a groove extending in the press-fitting direction may be provided on the tapered surface of the introduction convex portion as in the invention of claim 3 subordinate to the invention of claim 1 or 2. According to this configuration, immediately before the distance between the joint end portion of the first iron core and the inner surface of the joint recess becomes zero with the guide action of the lead projection, when the lead projection is likely to undergo plastic deformation, The introduction convex portion is elastically deformed in the direction to close the groove, and the reaction force corrects the inclination of the first iron core in the longitudinal direction and the like to ensure the parallelism of the first iron core with respect to the second iron core.
[0017]
Further, in solving the first problem, as in the invention of claim 4 subordinate to the invention of claim 1 or 2, either one of the tapered surface of the joint concave portion or the introduction convex portion, the While providing the fitting groove extended in the thickness direction of an iron core, it is good to provide the protrusion fitted to the said fitting groove when press-fitting the said 1st iron core on the other side. According to this configuration, when the taper surface slides through the inner surface of the joint recess during assembly and the joint ends of the first iron core are introduced into the joint recess, respectively, the longitudinal inclination of the first core with respect to the second core. In particular, since the protrusion and the fitting groove are fitted to prevent the inclination of the first iron core in the width direction with respect to the second iron core, the parallelism of the first iron core with respect to the second iron core is guaranteed. However, press-fitting can be started.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
[0019]
The electromagnetic device according to the present embodiment is a discharge lamp ballast 20, which includes a transformer main body 21 and a bottom plate 22 made of a steel plate and caulked to both side edges 22 a of the bottom plate 22 as shown in FIG. And a steel plate cover 23 to be formed. The bottom plate 22 and the cover 23 form a ballast case (electromagnetic device case). In FIG. 3, reference numeral 24 denotes a synthetic resin terminal cover which is attached to the transformer body 21 by claw engagement so as to cover a terminal fitting which will be described later exposed from the cover 23. The discharge lamp ballast 20 is used by attaching a bottom plate 22 to a chassis of a lighting fixture (not shown) by screwing or the like.
[0020]
The transformer body 21 includes a coil 25 and an iron core structure 26 as shown in FIGS. 1, 2, and 4. The coil 25 has bobbins 27 and 28 made of synthetic resin, one of which is wound with a primary conductor 29 made of copper wire and the other is a secondary conductor made of copper wire. 30 is wound. The bobbins 27 and 28 are integrally formed, but may be formed separately.
[0021]
The bobbin 27 has a pair of flanges 27a and 27b. A terminal block 31 is integrally formed on the outer surface of the flange 27a, and one or more terminal fittings 32 are attached thereto. Similarly, the other bobbin 28 also has a pair of flanges 28a and 28b. A terminal block 33 is integrally formed on the outer surface of the flange 28a, and one or more terminal fittings 34 are attached thereto. Of the terminal fittings 32 and 34, those necessary depending on the winding structure are connected to the terminal portions of the conductors 29 and 30 and lead wires (not shown) inserted through the holes of the terminal cover 24. It has become so.
[0022]
The iron core structure 26 is formed by combining a center leg iron core 35 as a first iron core and a side leg iron core 36 as a second iron core. The center leg iron core 35 is formed by stacking and connecting a plurality of iron core plates made of thin steel plates punched to the same size in the shape of I. Both end portions in the longitudinal direction of the central leg core 35 are used as joint end portions 35a, and the end surfaces (joint end surfaces) 35a1 are formed by arcuate surfaces in the width direction.
[0023]
The side leg iron cores 36 are formed by stacking and connecting a plurality of iron core plates made of thin steel plates that are punched to the same size in the shape of a long rectangular frame. A joint concave portion 37 is provided on the inner surface of the frame portion opposite to the longitudinal direction of the side leg iron core 36, and a leakage convex portion 38 is provided on the center portion of the inner surface of the frame portion extending in the longitudinal direction. ing. The pair of joint recesses 37 are formed as recesses having an arc shape in the width direction in conformity with the shape of the joint end 35a.
[0024]
The central leg iron core 35 is provided so as to penetrate the bobbins 27 and 28 in the coil 25 in the axial direction, and the central leg iron core 35 penetrated through the coil 25 press-fits the joint end 35 a into the joint recess 37. Therefore, it is installed inside the side leg iron core 36. As a result, both the iron cores 35 and 36 form a closed magnetic circuit, and the leaky convex portions 38 approach the side surfaces of the central leg iron core 35 in the longitudinal direction, respectively, and FIG. As shown in (B), a predetermined magnetic gap g is provided, and magnetism is leaked through the gap g. In addition, when providing such a gap g, it may replace with providing the leakage convex part 38 in the side leg iron core 36, and may protrude integrally from the longitudinal direction center part side surface of the center leg iron core 35. FIG.
[0025]
2B, the distance L2 between the furthest flanges 27a and 28a of the coil 25 is equal to the distance L1 between the inner surfaces of the short frame portions opposite to each other in the longitudinal direction of the side leg iron core 36. The width W2 of each flange 27a, 27b, 28a, 28b of the coil 25 is set to be smaller than the width W1 between the inner surfaces of the long frame portions extending in the longitudinal direction of the side leg iron core 36. . This prevents the flanges 27a, 27b, 28a, 28b from being caught by the inner surface of the side leg core 36 and scraped off during the press-fitting. In addition, first tapered surfaces 40 for continuously decreasing the width dimension of the flange portions on the press-fitting direction side of the flanges 27a and 28a are respectively formed on the outer surfaces of the flange portions. Are respectively provided with second tapered surfaces 41 for continuously reducing the thickness of these portions. This facilitates press-fitting into a side leg core 36 described later.
[0026]
Further, the flange facing the inner surface of the short frame portion located at both longitudinal ends of the side leg iron core 36, in other words, the center in the width direction of the flanges 27 a and 28 a arranged on the joint end portion 35 a side of the center leg iron core 35. In addition to the terminal block 31 or 33, an introduction convex portion 39 is integrally formed on the outer surface of the portion, on the opposite side of the terminal block 31 and 33 with the central leg core 35 interposed therebetween. Yes. These convex portions 39 are provided corresponding to the joint concave portions 37, and the projecting dimensions are gradually reduced as the distance from the joint end portion 35 a of the center leg core 35 is increased, and is indicated by an arrow A in FIGS. 1 and 4. It is formed in a tapered shape that tapers in the press-fitting direction. Moreover, as shown in FIG. 1, the tapered surface 39a of the introduction convex portion 39 is formed as a convex curved surface. When the central leg iron core 35 passes through the coil 25 and is combined, the taper surface 39a is continuous with the joint end surface 35a1 of the joint end portion 35a.
[0027]
1, 3, and 4, 42 is a claw that is located on both sides of the terminal block 31 or 32 and is integrally projected from the outer surface of the flanges 27 a and 28 a, and is hooked on these claws to form the terminal A cover 24 can be attached.
[0028]
In order to assemble the transformer main body 21 included in the discharge lamp ballast 20 having the above-described configuration, as shown in FIG. 1, the combination of the coil 25 with the central leg iron core 35 inserted and the side leg iron core 36 are illustrated. The joint end 35a of the center leg core 35 protruding from, for example, the coil 25 is set by a pressurizing tool 43 (see a two-dot chain line in FIG. 1) of the press-fitting machine. This is performed by pressurizing the upper surface of the iron core and press-fitting the iron core 35 into the side leg iron core 36.
[0029]
At the time of this assembly, first, the joint end portion 35a of the central leg iron core 35 comes into contact with the joint recess 37 of the side leg iron core 36 and starts to press-fit, so that it protrudes from the outer surfaces of the flanges 27a and 28a of the coil 25, respectively. The introduced convex portions 39 are inserted into the joint concave portions 37, respectively. Then, following the passage of the pair of introduction convex portions 39 through the joint concave portion 37 while sliding the tapered surface 39 a on the inner surface of the joint concave portion 37, the joint end portion 35 a starts to press into the joint concave portion 37. .
[0030]
Therefore, the inclination of the central leg iron core 35 in the longitudinal direction with respect to the side leg iron core 36 can be prevented by the guide action accompanying the contact of the tapered surface 39a of the introduction convex part 39 with the joint concave part 37. In addition, since the tapered surface 39a is a convex curved surface, when the introduction convex portion 39 slides through the inner surface of the joint concave portion 37 and introduces the joint end portion 35a into the joint concave portion 37, the central leg with respect to the side leg iron core 36 is obtained. The inclination of the iron core 35 in the width direction can also be prevented.
[0031]
That is, in order to facilitate the press-fitting, the side leg iron core is provided in spite of having a longitudinal clearance generated by the relationship of the distance L1 <distance L2 and a clearance in the width direction generated by the relationship of the width W1 <W2. 36, the center leg iron core 35 is easily positioned in the longitudinal direction and the width direction, respectively, Central leg core 35 It is possible to prevent the joint ends 35a from being inclined in the longitudinal direction so that the height positions are different, and to prevent the center leg iron core 35 from being inclined in the width direction so that the height positions at both ends in the width direction are different.
[0032]
Therefore, while guaranteeing the parallelism of the central leg core 35 with respect to the side leg iron core 36, Central leg core 35 The joint end portions 35a are respectively introduced into the joint recesses 37 of the side leg iron cores 36, and the entire center leg iron core 35 can be press-fitted inside the side leg iron cores 36. Joint end face 35a1 Can be less damaged and damaged, and the press-fitting can be reduced while the center leg iron core 35 is deformed. Therefore, since the magnetic coupling between the iron cores 35 and 36 is rarely impaired, the electrical characteristics do not vary greatly, and the quality can be improved.
[0033]
5 and 6 show a second embodiment of the present invention. Since this embodiment basically has the same configuration as that of the first embodiment, the same reference numerals as those of the first embodiment are given to the same components, and the configuration and operation thereof will be described. Will be omitted and different parts will be described below.
[0034]
The second embodiment differs from the first embodiment in that the tapered surface 39a of each introduction convex portion 39 extends in the press-fitting direction (in other words, the thickness direction of the central leg core 35), for example, at the center position in the width direction. The groove 45 is provided, and the configuration other than this point is the same as that of the first embodiment.
[0035]
According to the configuration of the second embodiment, in assembling the transformer main body 21, as already described, the taper surface 39 a is passed through the inner surface of the joint recess 37 while sliding, so that the central leg iron core 35 with respect to the side leg iron core 36. When the joint end 35a of the central leg core 35 is introduced into the joint recess 37, respectively, while preventing the inclination in the longitudinal direction and the width direction, the distance between the joint end 35a and the inner surface of the joint recess 37 becomes zero. Immediately before, when the introduction convex portion 39 is likely to undergo plastic deformation, the introduction convex portion 39 is elastically deformed in the direction of closing the groove 45, and the joining end surface 35a1 can be smoothly fitted to the inner surface of the joint concave portion 37. it can.
[0036]
Therefore, it is superior to the first embodiment in that the longitudinal inclination of the central leg core 35 can be appropriately corrected so that the reaction force of the elastic deformation at each introduction convex portion 39 is equal. Yes. Therefore, regardless of variations in dimensions of the bobbins 27 and 28, the parallelism of the central leg iron core 35 with respect to the side leg iron core 36 is ensured, and these are assembled by press-fitting so that there is little variation in electrical characteristics. The transformer body 21 can be obtained.
[0037]
7 and 8 show a third embodiment of the present invention. Since this embodiment basically has the same configuration as that of the first embodiment, the same reference numerals as those of the first embodiment are given to the same components, and the configuration and operation thereof will be described. Will be omitted and different parts will be described below.
[0038]
The third embodiment differs from the first embodiment in that a protrusion 51 extending in the press-fitting direction is provided, for example, at the center position in the width direction of the tapered surface 39a of each introduction convex portion 39, and the width of the joint concave portion 37 is increased. A fitting groove 52 extending in the thickness direction of the side leg iron core 36 is provided at the center in the direction. The protrusion 51 is fitted into the fitting groove 52 before the center leg iron core 35 is press-fitted inside the side leg iron core 36, and is inserted through the groove 52. The configuration other than this point is the same as that of the first embodiment, and in this embodiment, the fitting groove 52 can select a curvature smaller than the curvature of the joint recess 37 or a rectangular shape. It is good also as a fitting groove.
[0039]
According to the configuration of the third embodiment, in assembling the transformer main body 21, as described above, the taper surface 39 a is passed through the inner surface of the joint recess 37 while sliding, so that the central leg core 35 with respect to the side leg core 36. When the joint end 35a of the center leg iron core 35 is introduced into the joint recess 37 while preventing the inclination in the longitudinal direction and the width direction, the protrusion 51 and the fitting groove 52 are fitted to each other. In particular, it is possible to prevent the tilt in the width direction of the central leg core 35 with respect to the side leg iron core 36 by hooking and to start press-fitting while ensuring the parallelism of the central leg core 35 with respect to the side leg iron core 36. It is superior to the first embodiment. Therefore, it is possible to obtain a high-quality transformer body 21 with little variation in electrical characteristics.
[0040]
Further, the fitting groove 52 corresponding to the protrusion 51 provided at the center position in the width direction of the tapered surface 39a of the introduction convex portion 39 has the center leg iron core 35 as shown in FIG. 8 in a state where the transformer main body 21 is assembled. It is arranged at the center position in the width direction, in other words, at the center position in the longitudinal direction of the shorter frame portion provided with the bonding recess 37. Therefore, the magnetic flux passing through the closed magnetic path is not greatly disturbed by the fitting groove 52.
[0041]
That is, the magnetic flux generated when energizing the transformer main body 21 as represented by an arrow in FIG. 8 representatively at one end of the transformer main body 21 passes through the central leg iron core 35 in the longitudinal direction and passes through the joint with the side leg iron core 36. Then, since it passes so that it may be distributed to the longitudinal direction both ends of the said frame part, the magnetic flux density of the said frame part is the lowest in the longitudinal center part with the junction recessed part 37, and its both sides are high. Therefore, by providing the fitting groove 52 at a position where the magnetic flux density is low, the magnetic flux can be less disturbed by the fitting groove 52, and the electrical characteristics of the discharge lamp ballast 20 are hardly impaired.
[0042]
In the fourth embodiment, the fitting groove 52 is formed on the central leg core 35. Joint end face 35a1 And a protrusion 51 Bonding recess 37 It may be provided and implemented.
[0043]
FIG. 9 shows a fourth embodiment of the present invention. Since this embodiment basically has the same configuration as that of the first embodiment, the same reference numerals as those of the first embodiment are given to the same components, and the configuration and operation thereof will be described. Will be omitted and different parts will be described below.
[0044]
The fourth embodiment differs from the first embodiment in that an engagement recess 55 is provided on the distal end surface of the leakage protrusion 38 that is continuous over the entire thickness direction of the side leg core 36, and correspondingly. Engagement projections 57 project from the bridge portions 56 that connect the bobbins 27 and 28 together. The engaging projections 57 arranged on the both sides in the thickness direction of the central leg core 35 are respectively fitted into the engaging recesses 55 with the press-fitting. The configuration other than this point is the same as that of the first embodiment.
[0045]
According to the configuration of the fourth embodiment, in assembling the transformer main body 21, as described above, the taper surface 39 a is passed through the inner surface of the joint recess 37 while sliding, so that the central leg core 35 with respect to the side leg core 36. The joint end 35a of the center leg core 35 can be introduced into the joint recess 37 while preventing the inclination of the center leg core 35 in the longitudinal direction and the width direction, respectively. It is possible to prevent the iron core 35 from being distorted by the action of the stress that is caused by the positioning action in the width direction of the transformer main body 21 by the fitting of the engaging convex portion 57 to the engaging concave portion 55.
[0046]
In the conventional configuration in which positioning in the width direction as described above cannot be performed, there is a high risk of distortion of the shape of the central leg iron core, and this distortion reduces one of the magnetic gaps on both sides of the central leg iron core and the other. Since the magnetic flux becomes larger, the leakage magnetic flux concentrates on the narrow magnetic gap and magnetic saturation occurs, so that the electric characteristics of the discharge lamp ballast are likely to go wrong.
[0047]
However, in the fourth embodiment, as described above, the central leg core 35 can be prevented from being distorted from both sides, and the size of both magnetic gaps g can be kept the same. It is excellent in that it is easy to ensure and a high-quality discharge lamp ballast 20 can be obtained.
[0048]
FIG. 10 shows a fifth embodiment of the present invention. Since this embodiment basically has the same configuration as that of the first embodiment, the same reference numerals as those of the first embodiment are given to the same components, and the configuration and operation thereof will be described. Will be omitted and different parts will be described below.
[0049]
The fifth embodiment differs from the first embodiment in that grooves 61 that are continuous over the entire thickness direction of the side leg cores 36 are provided on both side surfaces of the leaky convex portion 38, respectively. And the protruding item | line 62 extended in the thickness direction of the center leg iron core 35 is each protrudingly provided in the opposing surface of the flanges 27b and 28b which the bobbins 27 and 28 mutually oppose. These ridges 62 are respectively fitted to the corresponding grooves 61 with the press-fitting. The configuration other than this point is the same as that of the first embodiment.
[0050]
According to the configuration of the fifth embodiment, in assembling the transformer main body 21, as already described, the taper surface 39 a is passed through the inner surface of the joint recess 37 while sliding, so that the central leg core 35 with respect to the side leg core 36. The joint end portions 35a of the central leg core 35 can be introduced into the joint recesses 37, respectively, while preventing the inclination in the longitudinal direction and the width direction, and the protrusions 62 are respectively fitted into the grooves 61 upon press-fitting completion. The leakage convex portion 38 can be supported by being sandwiched by the flanges 27b and 28b from both sides thereof. Thereby, it is possible to prevent the leakage convex portion 38 from vibrating due to the magnetic attractive force generated in the magnetic gap g when the transformer main body 21 is energized.
[0051]
In the conventional configuration without the vibration preventing structure as described above, the leakage convex portion 38 vibrates due to the magnetic attraction force, which propagates to the ballast case including the bottom plate 22 and the cover 23 and causes noise. There is. However, according to the fifth embodiment, since the vibration of the leakage convex portion 38 can be prevented as described above, it is excellent in that noise during energization of the discharge lamp ballast 20 can be reduced.
[0052]
The present invention can be applied to electromagnetic devices other than discharge lamp ballasts, and the individual techniques shown in the above embodiments can be implemented in combination with the respective embodiments.
[0053]
Further, in the present invention, the tapered surface 39a that tapers the introduction convex portion 39 in the press-fitting direction can be provided only on the tip end side of the introduction convex portion 39 in the press-fitting direction.
[0054]
【The invention's effect】
The present invention is implemented in the form as described above, and has the following effects.
[0055]
Claims 1, 2 According to the invention described in When the first iron core is press-fitted inside the second iron core during assembly, it is possible to prevent both the inclination in the longitudinal direction and the width direction of the first iron core, Since the parallelism of the first iron core with respect to the square frame-shaped second iron core is guaranteed, both iron cores can be accurately positioned and the press-fit of the entire first iron core can be started inside the second iron core. And the magnetic coupling between the pair of joint recesses of the second iron core is improved, Less variation in electrical characteristics Quality can be improved.
[0057]
According to the invention of claim 3 that is dependent on the invention of claim 1 or 2, even when the introduction convex portion is likely to cause plastic deformation when the first iron core is press-fitted inside the second iron core. Since the introduction convex part is elastically deformed in the direction to close the groove and the inclination of the longitudinal direction of the first iron core can be corrected appropriately, the positioning accuracy of both iron cores is further improved, and the variation in electrical characteristics is reduced and the quality is improved. Can be improved.
[0058]
According to the invention of claim 3 dependent on the invention of claim 1 or 2, when the first iron core is press-fitted inside the second iron core, not only the inclination of the first iron core in the longitudinal direction but also the protrusion Since the fitting with the fitting groove can prevent the inclination of the first iron core in the width direction with respect to the second iron core, the positioning accuracy of both iron cores is further improved, the variation in electrical characteristics is further reduced, and the quality can be improved.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a configuration of a transformer body of a discharge lamp ballast according to a first embodiment of the present invention.
2A is a plan view showing a configuration of a transformer main body shown in FIG. 1. FIG.
(B) is a back view which shows the structure of the trans | transformer main body shown by FIG.
FIG. 2C is a side view of the transformer body viewed from the direction of arrow Z in FIG.
FIG. 3 is a perspective view showing a configuration of the entire discharge lamp ballast according to the first embodiment.
4 is an exploded side view showing the structure of the transformer main body shown in FIG. 1 in an exploded manner. FIG.
FIG. 5 is an exploded perspective view showing a configuration of a transformer main body of a discharge lamp ballast according to a second embodiment of the present invention.
6A is a rear view showing the configuration of the transformer main body shown in FIG. 5. FIG. FIG. 7B is a side view of the transformer body viewed from the direction of arrow Y in FIG.
FIG. 7 is an exploded perspective view showing a configuration of a transformer body of a discharge lamp ballast according to a third embodiment of the present invention.
8A is a rear view showing the configuration of the transformer main body shown in FIG. 7. FIG.
FIG. 9 is an exploded perspective view showing a configuration of a transformer main body of a discharge lamp ballast according to a fourth embodiment of the present invention.
FIG. 10 is an exploded perspective view showing a configuration of a transformer main body of a discharge lamp ballast according to a fifth embodiment of the present invention.
FIG. 11 is an exploded perspective view showing a configuration of a transformer main body of a discharge lamp ballast according to a conventional example.
12 is an exploded perspective view showing a configuration of an iron core structure included in the transformer main body shown in FIG. 11. FIG.
13A is a plan view showing the configuration of the transformer main body shown in FIG. 11. FIG.
(B) is a back view which shows the structure of the trans | transformer main body shown by FIG.
FIG. 12C is a side view of the transformer body viewed from the direction of arrow X in FIG.
14 is an exploded side view showing the structure of the transformer main body shown in FIG. 11 in an exploded manner.
FIG. 15 is a longitudinal side view showing a situation in which press-fitting is going to be performed due to an inaccuracy in parallelism when the transformer main body shown in FIG. 11 is assembled.
[Explanation of symbols]
20 ... discharge lamp ballast (electromagnetic device),
21 ... Transformer body (electromagnetic device body),
25 ... Coil,
26 ... iron core structure,
27, 28 ... bobbins,
29, 30 ... conductors,
27a, 27b, 28a, 28b ... flange,
35 ... Central leg iron core (No. 1 iron core),
35a ... Join end,
35a1 ... Joining end face,
36 ... side leg iron core (second iron core),
37. Joint recess,
39 ... introduction convex part,
39a ... taper surface,
45 ... groove,
51 ... protrusions,
52 ... fitting groove.

Claims (4)

A coil conductor made of a synthetic resin bobbin wound, are formed by a first core which is formed by stacking a plurality of core plates through said coil, a rectangular frame of a plurality of core plates laminated A second end portion having a plurality of joint recesses on the inner surface, wherein the joint end portions of the first iron core are press-fitted into the recesses in the thickness direction, and the first iron core is disposed on the inner side and forms a closed magnetic circuit together with the first iron core . And a joint end of the first iron core having a joint end surface formed by an arcuate surface, and the joint recess formed by a recess having an arc shape corresponding to the shape of the joint end. In the electromagnetic equipment
An introduction convex portion is provided on the outer surface of the flange disposed on the joint end portion side of the first iron core of the flange included in the bobbin so as to correspond to the joint concave portion, and the convex portion is tapered in the press-fitting direction. An electromagnetic device characterized by having a tapered shape, a tapered surface of the introduction convex portion being a convex curved surface, and the introduction convex portion being continuous with the joining end portion . The electromagnetic device according to claim 1 , wherein a width of the introduction convex portion is smaller than a width of the joint concave portion .   The electromagnetic device according to claim 1, wherein a groove extending in the press-fitting direction is provided on a tapered surface of the introduction convex portion.   A fitting groove extending in the thickness direction of the iron core is provided on one of the tapered surfaces of the joint concave portion or the introduction convex portion, and the other is fitted into the fitting groove when the first iron core is press-fitted. The electromagnetic device according to claim 1, wherein a projection to be joined is provided.

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