JP2009212128A - Wound component - Google Patents

Abstract

[PROBLEMS] To solve all the problems simultaneously such as disconnection due to external force applied to the terminal, disconnection due to solder dip heat, improvement of contact conduction reliability between the terminal and the winding wire material, and improvement of workability of the winding end tangling process. A winding component that is inherently reliable can be realized.
A terminal 12 is implanted in a bobbin 14 having a winding portion, and a resin convex portion 40 integrated with the bobbin is formed at the base of the terminal, and the resin convex portion is a part of the periphery of the terminal. Is a winding component in which a part of the side surface of the terminal protrudes and a winding wire wound around the resin convex portion a plurality of times comes into contact with the terminal and is conductive by soldering. Here, a resin protrusion 42 for hooking the wire integral with the bobbin is provided in the vicinity of the resin protrusion in a direction perpendicular to the longitudinal direction of the terminal, and the winding wire is tightly wound a plurality of times while being hooked on the resin protrusion. It is configured so that there are two or more contact conduction points between the terminal and the wire.
[Selection] Figure 1

Description

  The present invention relates to a terminal mounting structure in a winding component and a connection structure between a terminal and a winding terminal. More specifically, in the present invention, a resin convex part is formed integrally with the bobbin at the base of the terminal connecting the winding terminal, and a part of the terminal side surface protrudes by cutting out a part of the periphery of the resin convex part. In addition to providing a resin protrusion integral with the bobbin in the direction orthogonal to the terminal, hooking the winding wire using the resin protrusion and winding it multiple times densely, the terminal and the wire are in contact with each other at multiple locations The present invention relates to a winding component having a structure made conductive by soldering. Although this technique is not particularly limited, it is useful, for example, for attaching a high-voltage secondary terminal of an inverter transformer for lighting a cold cathode tube and for a contact conduction structure between the terminal and the secondary winding wire.

  A cold cathode discharge tube is generally used as a backlight light source in a liquid crystal display device, and is driven to be lit by an inverter transformer that generates a high voltage. The inverter transformer, for example, forms a primary winding and a secondary winding in the winding portion of the bobbin, and connects a winding terminal to a plurality of terminals implanted in the terminal fixing portion so that a closed magnetic circuit is formed. The structure is equipped with a magnetic core. Since a relatively large current flows through the primary winding, an electric wire having a diameter of 0.1 mm or more (called a thick wire) formed by twisting a plurality of polyurethane-coated wires is used, whereas the secondary winding is high. Since a voltage is generated but a flowing current is small, a single wire (referred to as a thin wire) of a polyurethane-coated wire having a wire diameter of 0.1 mm or less (for example, a copper wire diameter of about 0.03 to 0.04 mm) is used. Each winding terminal made of these wires is entangled with a terminal and soldered. Soldering is performed by dipping (immersing) in molten solder. Usually, the thick line and the thin line have different dip temperatures and times, and are performed under optimum conditions.

  There is almost no problem with a thick stranded wire, but there are two major problems in connecting to a thin single-wire terminal, and failures are likely to occur. One of the problems is that when an external force is applied to the tip of the terminal and bending deformation occurs, the wire tie portion at the base is also deformed and the wire is locally stretched, which may cause disconnection, and the other is Since the wire is thin, it is a problem that it is easily broken by receiving stress due to solder dip heat.

  A method of solving the problem of disconnection associated with the application of external force to the terminal tip of the former by devising the shape of the terminal itself has been proposed (see Patent Document 1). This is because when the external force is applied near the tip of the terminal by forming a constriction ahead of the winding terminal tie part at the terminal base (on the anti-bobbin side) or by setting it to a small diameter, This is a technique for preventing the wire rod from being disconnected because it is not bent and deformed at the winding terminal binding portion of the terminal. However, such a terminal shape causes a decrease in strength, and increases the cost because the terminal needs to be processed.

  A method for solving the latter problem of disconnection due to solder dip heat by devising the structure of the terminal fixing portion has been proposed (see Patent Document 2). This is because ribs are formed on both sides of the upper part of the terminal fixing part, the base part of the terminal lead groove is located at the same position as the upper end surface of the rib, and the winding terminal pulled out from the lead groove is exposed to the outside from the base part of the lead groove. The structure is such that it is pulled out and hooked to the upper end surface of the rib and tangled with the terminal. This is intended to prevent disconnection due to the winding terminal biting into the mold melted by the solder dip heat. However, even with this structure, since the drawn thin single wire is dipped into the molten solder in a single state, the problem of thinning the wire cannot be solved.

  In addition, since these are separate methods, it is impossible to solve both the problem of disconnection due to application of external force to the terminal and the problem of disconnection due to solder dip heat at the same time, regardless of which technique is used.

As a technique that can solve such problems all at once, the present inventors previously formed a resin convex portion integrally with the bobbin at the base of the terminal connecting the winding terminal, and the resin convex portion Proposed winding parts with a structure in which a part of the side of the terminal protrudes by cutting out part of the terminal, and the terminal and wire are in contact with each other when the winding terminal is wound around the resin protrusion multiple times. (See Patent Document 3). Thus, basically, both the problem of disconnection due to the application of external force to the terminal and the problem of disconnection due to solder dip heat can be solved simultaneously. However, in actual component manufacturing, it has been recognized that if the solder dipping operation is continued, a case where the terminal and the wire cannot be electrically connected due to a decrease in the solder liquid level occurs. In addition, when winding wire rods are densely wound around the outer peripheral surface of the resin convex portion, the wires are aggregated so as not to become sparse, so that there is a problem that careful work is required and workability is slightly lowered.
Japanese Patent Laid-Open No. 11-176658 JP 2001-345222 A JP 2007-201328 A

  Problems to be solved by the present invention include disconnection due to external force application to the terminal, disconnection due to solder dip heat, and improvement in contact conduction reliability between the terminal and the winding wire material, and improvement in workability of the winding terminal binding process. It is a problem. The present invention solves all of these problems at the same time, and further prevents the terminal strength from being lowered, resulting in neither increase in cost nor thinning of the line.

  In the present invention, a terminal is implanted in a bobbin provided with a winding part, and a resin convex part integral with the bobbin is formed at the base of the terminal, and the resin convex part is cut out at a part of the periphery thereof. In the winding part of the structure in which a part of the side surface of the terminal protrudes and the winding wire wound around the resin convex part is in contact with the terminal and is conducted by soldering, in the vicinity of the resin convex part In addition, the resin protrusion for hooking the wire integral with the bobbin protrudes in a direction perpendicular to the longitudinal direction of the terminal, and the winding wire is wound multiple times in a state of being hooked on the resin protrusion, and the terminal and the wire It is a winding component characterized by having two or more contact conduction locations.

  Here, the resin protrusion protrudes in a direction opposite to the main wire (bus) crossing portion where the winding wire becomes a single wire and reaches the winding portion, and the winding wire extends across the resin convex portion and the resin protrusion. It is wound in a state of being aggregated many times, and is wound in a state of being aggregated many times across the terminals and resin protrusions, including all of the resin protrusions and the contact points between the terminals and wires on the side opposite to the main wire crossing part. Further, a structure in which a part of the resin protrusion is solder dipped is preferable.

  Such a winding component is, for example, an inverter transformer for lighting a cold cathode tube, and is provided with a resin convex portion at the base of the terminal of the high-voltage secondary winding, and for hooking a wire in a direction perpendicular to the longitudinal direction of the terminal. The resin protrusion is provided. Since the primary winding is a thick wire (stranded wire), it is not necessary to provide such resin protrusions and resin protrusions on the terminals of the primary winding.

  In the winding component according to the present invention, a resin convex part is formed integrally with the bobbin around the base of the terminal, and the resin convex part has a shape in which a part of the terminal side surface protrudes by cutting out a part of the periphery. The resin protrusion integral with the bobbin protrudes in a direction perpendicular to the terminal longitudinal direction, and the winding wire is wound around the resin protrusion multiple times, and the terminal and the wire are in contact with each other. Since it is configured so that there are two or more conductive locations, there is very little possibility that a conductive failure will occur at the time of solder dipping, and the reliability of contact conduction is greatly improved. In addition, since the winding wire is hooked on the resin protrusion and wound, the wire is always gathered even if the work is performed without special consideration. The winding terminal is tightly wound around the resin convex part, or gathers and closely adheres to the bobbin, so even if solder dip heat acts, the heat is absorbed by the resin convex part or bobbin, and the wire is thin It is hard to become, and by winding in close contact many times, even if the wire becomes thin, there is no problem in strength. Furthermore, since the solder dip can be performed up to a part of the resin convex portion including the contact portion between the terminal and the wire on the side opposite to the main wire crossing portion which is in the single wire state, it is in the single wire state. There is no risk of wire breakage at the main line crossover, and there is no risk of disconnection. In addition, as described above, the resin protrusion is integrally formed with the bobbin around the base of the terminal, and the winding wire is mainly wound around the resin protrusion, so that even if an external force is applied to the terminal, the resin protrusion Since the surface of the portion becomes a fulcrum of bending, the base of the terminal is not deformed by stress, and therefore the wire does not deform (elongate) and there is no fear of disconnection. As a result, a highly reliable winding component can be obtained.

  FIG. 1 is an explanatory view schematically showing an embodiment of a winding component according to the present invention, and shows an example of an inverter transformer suitable for lighting a discharge tube. Here, A is a disassembled state, and B is an assembled state as a plan view. Further, C indicates a side surface, and D indicates a terminal which is a main part of the present invention and a bobbin structure in the vicinity thereof. In addition, D is the state seen from the lower surface side (the tip end side of the pin) of the bobbin.

  This inverter transformer is an example of a two-output type. A pair of magnetic cores 10 that form a closed magnetic circuit by being combined, a bobbin 14 for winding provided with a plurality of pin terminals 12, and a winding around the bobbin 14 Primary winding P1 and two secondary windings S1 and S2.

  The magnetic core 10 is composed of a frame-shaped core 20 made of ferrite or the like and a rod-shaped core 22, and forms a closed magnetic path by being combined in a Japanese character shape. The rod-shaped core 22 has a rectangular cross section, and the frame-shaped core 20 has both sides of the rectangular frame-shaped portion projecting by the height of the rod-shaped core 22, has a length equivalent to the rod-shaped core 22, and the opening width of the frame is rod-shaped. The shape is larger than the width of the core 22. Accordingly, when the rod-shaped core 22 is covered with the frame-shaped core 20, the upper surfaces of both ends of the rod-shaped core 22 come into contact with the lower surfaces of both ends of the frame-shaped core 20 to form a Japanese character.

  In the bobbin 14 for winding, two partition plates 32 project from a cylindrical winding portion having flanges 30 at both ends, and the end portions of the flange 30 and the partition plate 32 serve as terminal fixing portions. The pin terminal 12 is planted. The winding portion has a rectangular tube shape into which the rod-shaped core 22 can be exactly inserted, and the distance between the bobbins on both ends matches the length of the frame-shaped core 20. The plurality of pin terminals 12 have a structure in which a base part is implanted in a terminal fixing part and a tip part can be inserted and connected to a mounting board.

  The primary winding P1 is wound around the central portion of the winding portion, and the two secondary windings S1 and S2 are wound around both side portions of the winding portion. For example, a polyurethane-coated electric wire (stranded wire) of φ0.35 mm is used as the primary winding, and a polyurethane-coated electric wire (single wire) of φ0.03 mm is used as the secondary winding. The winding terminal is connected to the pin terminal 12 by soldering.

  A feature of the present invention lies in the connection structure of the winding terminal particularly near the base of the pin terminal 12. As shown in FIG. 1D, a resin convex portion 40 integrated with the bobbin 14 is formed at the base of the pin terminal 12, and the resin convex portion 40 is cut out at a part of the periphery thereof to form one of the terminal side surfaces. It is the shape which a part protrudes. Further, a resin protrusion 42 integral with the bobbin 14 is provided so as to protrude in a direction orthogonal to the terminal longitudinal direction. The resin convex portion 40 and the resin protrusion 42 are integrally formed with the bobbin 14.

  The notch shape of the resin convex part 40 is made into a dimension shape which can contact a terminal and a wire, when a winding terminal is wound around the resin convex part. In addition, what is necessary is just to form such a resin convex part in the base of the terminal which connects a thin electric wire. Here, the resin convex part is formed only in the terminal of the secondary side which binds the polyurethane covering electric wire (single wire) of φ 0.03 mm.

  The resin convex portion 40 has a generally oval shape, and the pin terminal 12 is located closer to one end portion (the end portion away from the winding portion). Here, a pin terminal having a rectangular cross section is shown, and one ridge line of the quadrangular columnar pin terminal 12 and its vicinity are exposed. The height of the resin protrusion 40 may be about 1 mm, and the length is preferably about 3 mm. The range in which the side surface of the terminal is exposed by the notch is preferably about 20 to 30% of the entire circumference. In this example, about 3/4 of the periphery of the pin terminal 12 is surrounded by the resin convex portion 40.

  The resin protrusion 42 protrudes from the end of the bobbin 14 (the end away from the winding part), and the wire hooking portion of the resin protrusion 42 is provided below the surface of the bobbin 14. Here, it is a quadrangular columnar projection, but it can be any shape such as cylindrical, semi-columnar, polygonal column as long as it can be hooked when winding the wire, and the protruding length is such that the hooked wire does not easily come off I just need it.

  FIG. 2 shows a state in which the winding terminal is bound. The winding terminal is wound in a state of being in close contact with the resin protrusion 40 to the resin protrusion 42 many times (for example, about 10 times), and the pin terminal 12 and the wire 44 are in contact with each other. Furthermore, it is wound many times (for example, about 10 times) from the resin protrusion 42 to the pin terminal 12 in close contact with each other, and the pin terminal 12 and the wire 44 come into contact with each other. A contact location is indicated by a symbol c. The main wire (bus) connecting portion 44a that reaches the winding portion in a single-wire state is located on the side opposite to the contact portion between the pin terminal 12 and the wire 44, more specifically on the side opposite to the resin protrusion 42. That is, the winding terminal is drawn out from the side opposite to the resin protrusion 42 in a single-wire state, and wound in a state of being in close contact with the wire. As shown in FIG. 2C, a part of the resin convex portion 40 including the contact portion between the pin terminal 12 and the wire 44 on the side opposite to the main wire crossing portion 44a in a single wire state is solder dip. Is done. The surface position of the molten solder at the time of dipping is indicated by reference sign s-s.

  If the height of the resin convex portion 40 is about 1 mm, winding about 10 times is easy. Further, as shown in FIG. 2C, the liquid level s-s of the molten solder at the time of solder dipping needs to be controlled to about half of the length of the resin convex portion 40. If the length of the portion 40 is about 3 mm, the liquid level control of the molten solder is easy, and there is no fear that the main wire crossing portion 44a in a single wire state touches the solder. Accordingly, no thinning occurs in the main line crossing portion 44a in a single-wire state, and there is no fear of disconnection. The winding end is wound in close contact with the bobbin 14 so as to surround the resin convex portion 40, and the heat is absorbed by the resin convex portion even if solder dip heat is applied. However, it is difficult for the wire rod to be thinned, and even if it is thinned, the problem that the cross-sectional area is reduced and the problem of strength do not occur.

  In this embodiment, due to the solder dip, the wire 44 and the pin terminal 12 are brought into contact conduction at least at two positions near the upper surface of the resin convex portion 40 and the notch position of the resin convex portion 40, both of which are in contact failure. Since there is almost no possibility of a situation in which conduction is not possible, the reliability of conduction connection is greatly improved.

  FIG. 3 is an explanatory view showing a deformation when an external force is applied to the tip of the pin terminal. Since the resin convex portion 40 is formed integrally with the bobbin 14 around the base of the pin terminal 12, the portion surrounding the pin terminal 12 on the surface of the resin convex portion 40 even if an external force F is applied to the tip portion of the pin terminal 12. Becomes the fulcrum of bending (the fulcrum is indicated by a symbol x), the pin terminal 12 is simply deformed as indicated by the dotted line, and the root of the pin terminal 12 (winding end linking portion) is not deformed by an external force. The wire does not deform (elongate) and there is no fear of disconnection. Further, since the position of the portion wound around the pin terminal 12 is also limited along the upper surface of the resin convex portion 40 due to the effect of the resin protrusion 42, the wire does not deform (elongate) and there is no fear of disconnection.

  If the pin terminal 12 is rectangular in cross section, it is difficult to bend in a diagonal direction when an external force is applied, and it is easy to bend in a direction parallel or perpendicular to the surface. However, since all four surfaces of the pin terminal 12 are not free and are supported by the resin convex portion 40, they become fulcrums of bending, so that the pin terminal 12 can be applied to an external force in any of the front, rear, left and right directions. The root is not deformed. For the prototype, an external force of 5 N was applied to the tip of the pin terminal in the front-rear and left-right directions, but no breakage occurred in the secondary winding.

  Another embodiment of the present invention is shown in FIG. Since the basic configuration is the same as that of the above-described embodiment, the same reference numerals are given to corresponding parts for the sake of simplicity. A is an example using a pin terminal 12 having a circular cross section. The cross-sectional shape of the pin terminal may be a polygon.

  In each of the embodiments described above, one side surface of the resin protrusion 42 is flush with the side surface of the bobbin 14. However, in the example shown in FIG. 4B, one side surface of the resin protrusion 42 is the side surface of the resin protrusion 40. The shape is consistent with In this way, the wire hooked on the resin protrusion 42 is wound as it is along the side surface of the resin convex portion 40, so that the wire rod can be better accommodated, and the wire rod can be prevented from appearing on the side surface of the bobbin 14.

  In the example shown in C of FIG. 4, the tip end side of the resin convex portion 40 is extended to be connected to the resin protrusion 42. Even in this case, the wire hooked on the resin protrusion 42 is wound as it is along the side surface of the resin convex portion 40, so that the wire rod can be better accommodated and the wire rod can be prevented from appearing on the side surface of the bobbin 14.

  FIG. 5 is an explanatory view showing still another embodiment of the present invention. Here, the basic configuration may be the same as that of the embodiment shown in FIG. 1 and FIG. 2 described above, and therefore, corresponding parts are denoted by the same reference numerals in order to simplify the description. The resin convex portion 40 has a generally oval shape, and the pin terminal 12 is located closer to one end portion (the end portion away from the winding portion). In this embodiment, the other end portion (the end portion closer to the winding portion) of the resin convex portion 40 has a step structure.

  The winding terminal is wound on the surface of the bobbin 12 in a state of being in close contact with the resin protrusion 40 to the resin protrusion 42 many times (for example, about 10 times), and the pin terminal 12 and the wire 44 are connected in the middle. Contact. Further, the resin protrusion 42 is wound around the stepped portion 40a of the resin convex portion 40 a number of times (for example, about 10 times) in close contact with each other, and the pin terminal 12 and the wire 44 come into contact with each other. A contact location is indicated by a symbol c. The main wire crossing portion 44a in a single wire state is located on the side opposite to the contact portion between the pin terminal 12 and the wire 44 (on the side opposite to the resin protrusion 42). That is, the winding terminal is drawn out from the side opposite to the resin protrusion 42 in a single wire state, and wound in a state of being in close contact with two stages. Then, as shown in FIG. 5C, a part of the resin convex portion 40 including the contact portion between the pin terminal 12 and the wire 44 on the side opposite to the main wire crossing portion 44a in a single wire state is solder dip. Is done. The surface position of the molten solder at the time of dipping is indicated by reference sign s-s. A structure in which a winding position is defined by providing a groove in place of the step and winding a winding wire in the groove is also possible.

  Needless to say, the present invention can be applied not only to a straight pin terminal as described above, but also to a bent pin terminal, a surface mountable terminal structure, and the like. The positions, sizes, shapes, etc. of the resin protrusions and resin protrusions can be changed as appropriate.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic explanatory drawing which shows one Example of the coil | winding components which concern on this invention. Explanatory drawing which shows the state which wound the winding terminal. Explanatory drawing which shows a deformation | transformation when external force is added to the terminal front-end | tip part. Explanatory drawing of the principal part which shows the other Example of this invention. Explanatory drawing which shows the further another Example of this invention.

Explanation of symbols

10 Magnetic core 12 Pin terminal 14 Bobbin 40 Resin protrusion 42 Resin protrusion 44 Winding wire

Claims (3)

A terminal is planted on a bobbin provided with a winding part, and a resin convex part integrated with the bobbin is formed at the base of the terminal. In the winding component of the structure in which a part protrudes, the winding wire wound around the resin convex part a plurality of times is in contact with the terminal and is conducted by soldering.
In the vicinity of the resin protrusion, a resin protrusion for hooking the wire integral with the bobbin is projected in a direction orthogonal to the longitudinal direction of the terminal, and the winding wire is wound a plurality of times in a state of being hooked on the resin protrusion. A winding component characterized by having two or more contact conduction points between the terminal and the wire.   The resin protrusion is projected in the opposite direction to the main wire crossing part that reaches the winding part with the winding wire material being in a single wire state, and the winding wire material is aggregated many times across the resin convex part and the resin protrusion In addition to being wound around the terminal and the resin protrusion, it is wound in a state of being gathered many times, and on the side opposite to the main wire crossover part, the resin protrusion including all the resin protrusions and the contact point between the terminal and the wire The winding part according to claim 1, wherein a part of the winding part is solder dipped.   The winding part is an inverter transformer for cold-cathode tube lighting, the resin convex part is provided at the base of the terminal of the high-voltage secondary winding, and the resin protrusion for hooking the wire is provided in the direction orthogonal to the terminal longitudinal direction The winding component according to claim 1 or 2.

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