JP5151432B2 - Winding bobbins - Google Patents

Description

  The present invention relates to a bobbin including a winding portion around which a coil is wound and a terminal mounting portion in which a terminal to which an end portion of the coil is connected is implanted.

  As is well known, various winding parts such as transformers and motors have a winding part and a terminal mounting part, and the end of the coil wound around the winding part is implanted in the terminal mounting part. Various forms of bobbins connected to the terminals are incorporated.

  For example, an inverter transformer for discharging and lighting a cold cathode tube incorporated as a light source of a liquid crystal display boosts the input voltage to the primary coil to a high voltage of 1000 to 2000 V in the secondary coil, and In many cases, the two cold-cathode tubes are provided with two sets of secondary coils for lighting them simultaneously or differentially.

  For this reason, the transformer has two bobbins including a primary bobbin around which the primary coil is wound and a secondary bobbin around which the secondary coil is wound. The bobbin is formed with a terminal mounting portion in which a connection terminal connected to the external connection portion on the input side is implanted, and the secondary bobbin is connected to the two external connection portions on the output side A terminal mounting portion in which terminals are implanted is formed.

FIGS. 6 to 8 show bobbins in this type of conventional transformer. Reference numeral 1 in the figure denotes a primary bobbin, and reference numeral 2 denotes a secondary bobbin.
The bobbin 1 on the primary side has a substantially square plate-like terminal mounting portion 4 formed on one end side in the axial direction of a rectangular tube-shaped winding portion around which a primary coil 3 is wound around the outer periphery. In the terminal mounting portion 4, four connection terminals 5 each connected to the winding start end or terminal end of the primary coil 3 are implanted at substantially equal intervals in the width direction orthogonal to the axis. These connection terminals 5 are mounted on the board land.

  Further, on the upper surface of the terminal mounting plate 4, four groove portions 6 are formed between the primary coil 3 and the connection terminal 5 at intervals in the width direction, and the primary grooves are formed in the respective groove portions 6. The end of the coil 3 is inserted and guided. 6 shows a state in which the winding start end side end 3a of the primary coil 3 is inserted into the groove portion 6, and the winding end end side end portion is omitted.

  On the other hand, the secondary-side bobbin 2 is also formed with a substantially square plate-like terminal mounting portion 8 on the other end side in the axial direction of the rectangular tube-shaped winding portion around which the secondary coil 7 is wound around the outer periphery. It has been done. The terminal mounting portion 8 is provided with a binding terminal 9 to which a winding start end and a termination end of the secondary coil 7 are respectively connected, and a connection terminal 10 mounted on the board land. 9 and the connection terminal 10 are electrically connected within the terminal mounting portion 8.

  Further, the secondary bobbin 2 has four grooves 11 formed on the upper surface thereof from the secondary coil 7 toward the binding terminal 9, and the end of the secondary coil 7 is formed in each groove 11. Part is inserted and guided. In FIG. 6, illustration of the winding start end side and end side end portions of the secondary coil 7 originally inserted in the groove 11 is omitted. Further, a plurality of partition plates 12 for preventing creeping discharge in the high-voltage secondary coil 7 are integrally formed on the outer periphery of the winding portion of the secondary bobbin 2 at equal intervals in the axial direction. Yes.

  The primary and secondary bobbins 1 and 2 are synthetic resins having electrical insulating properties in a state where the terminal mounting portions 4 and 8 are positioned on opposite sides in the axial direction and the axes are aligned. Are integrally molded.

  In the transformer having the primary and secondary bobbins 1 and 2 having the above-described configuration, a core (not shown) is inserted into the openings 1a and 2a of the bobbins 1 and 2 that communicate with each other. A core (not shown) surrounding the primary coil 3 and the secondary coil 7 is arranged at both ends of the core to form a closed magnetic circuit.

  Here, when the primary coil 3 is wound around the winding portion of the primary-side bobbin 1 having the above-described configuration and the end thereof is connected to the connection terminal 5, first, in the winding step, the primary After one end of the wire material to be the coil 3 is entangled with the outer connecting terminal 5, the end 3a is inserted into the groove 6 extending from the connecting terminal 5 to the winding part, and further wound around the outer periphery of the winding part. After forming the primary coil 3 by turning, the end portion is inserted and guided into the adjacent groove portion 6 and is entangled with the connection terminal 5 adjacent to the connection terminal 5.

  Next, after sending to the soldering process and applying a flux around the binding portion of the primary coil 3 in the connection terminal 5, the binding portion is soldered to connect the end of the primary coil 3 to the connection terminal 5. Is done by connecting to.

  On the other hand, for the bobbin 2 on the secondary side, first, in the same manner, one end portion of the wire to be the secondary coil 7 is entangled with the outer linking terminal 9, and the end portion is wound from the linking terminal 9 to the winding portion. After being inserted into the groove portion 11 leading to the groove portion, it is wound around the outer periphery of the winding portion to form the secondary coil 7, and the end portion thereof is placed in the groove portion 11 located on the opposite side in the width direction with respect to the groove portion 11. After being inserted and guided, it is bound to the binding terminal 9 located on the opposite side of the binding terminal 9.

  Next, in the same soldering process, after flux is applied around the binding portion of the secondary coil 7 in the binding terminal 9, the binding portion is soldered and the end of the secondary coil 7 is bound. This is done by connecting to the terminal 9.

  By the way, in the primary and secondary bobbins 1 and 2 in the transformer, the end portions of the primary coil 3 and the secondary coil 7 are housed and protected in the groove portions 6 and 11, respectively. There is an advantage that the end portions of the primary coil 3 and the secondary coil 7 are exposed to the surface of the terminal mounting portions 4 and 8 and are not broken due to some cause.

  In addition, particularly when the connection terminal 5 is mounted on the board land (external connection portion) or the like, an external force such as bending acts on the connection terminal 5 to be deformed, whereby the end of the primary coil 3 is tensioned. Even in the case of the action, there is an advantage that this can be absorbed by the elasticity (elongation) of the wire constituting the primary coil 3.

  However, in the bobbins 1 and 2 on the primary side and the secondary side, in the soldering step, a part of the applied flux travels along the end of the primary coil 3 or the secondary coil 7 to form the groove portion. As a result, the end portions of the coils 3 and 7 are fixed to the terminal mounting portions 4 and 8 in the groove portions 6 and 11.

  For this reason, when an external force is applied to the connection terminal 5 or the binding terminal 9 due to some cause to cause deformation, this cannot be absorbed by the elongation of the coils 3 and 7. The primary coil 3 that is directly connected to the connection terminal 5 mounted on the board has a problem that it is easily broken due to deformation of the connection terminal 5 or the like.

  The present invention has been made in view of such circumstances, and even when an external force is applied to a terminal to which the end of the coil is connected to cause deformation, the terminal is surely absorbed by elongation at the end. An object of the present invention is to provide a bobbin for a winding component that can be used.

In order to solve the above-mentioned problem, the invention according to claim 1 is made of a material having electrical insulation, and a winding portion in which a coil is wound around an outer periphery, and a terminal mounting portion formed in the winding portion. In a bobbin of a winding component in which a terminal to which an end of the coil is fixed is implanted in the terminal mounting portion, the terminal mounting portion extends between the terminal and the coil. And forming a groove portion through which the end portion of the coil is inserted, and forming a convex portion on the bottom surface of the groove portion to separate the end portion of the coil from the bottom surface and prevent line contact with the bottom surface. A convex portion is formed on a side surface along which the end portion of the coil of the groove portion extends, and the end portion of the coil is separated from the side surface to prevent line contact with the side surface.

The invention according to claim 2 is the invention according to claim 1, wherein the terminal is a connection terminal to which an end of the coil is directly connected and connected to an external connection, and The convex portions are respectively formed on the bottom surface of the groove portion through which the end portion of the coil fixed to the connection terminal is inserted and the side surface along the end portion of the coil.

  Furthermore, the invention according to claim 3 is the invention according to claim 1 or 2, wherein the protrusion formed on the bottom surface has a height dimension such that the end of the coil does not protrude outward from the groove. It is characterized by being set.

  According to the invention described in any one of claims 1 to 3, the terminal mounting portion is formed with a groove portion that extends between the terminal and the coil and through which the end portion of the coil is inserted. The end of the coil can be protected to prevent the end of the coil from being damaged.

  In addition, a convex portion is formed on the side surface along the bottom surface of the groove and the end portion of the coil so as to prevent the end portion of the coil from separating from the bottom surface and the side surface to prevent line contact with the bottom surface and the side surface. In addition, in the soldering process, even when a part of the flux passes through the end portion of the coil and enters the groove portion, the end portion of the coil does not adhere to the terminal mounting portion in the groove portion. For this reason, even when an external force is applied to the terminal and the terminal is deformed, it can be absorbed by the extension of the end of the coil, and the coil is not broken.

  Here, as the terminal where the end portion of the coil is directly entangled, there are a connection terminal connected to an external connection portion, and a tie terminal intended only to entangle the end portion of the coil, The binding terminal is generally electrically connected to a connection terminal that is disposed adjacent to and connected to an external connection portion.

  Therefore, unlike the connection terminal connected to the external connection portion, the binding terminal is directly connected to the connection terminal as in the invention described in claim 2 because there is less possibility of external force acting. Only the groove portion through which the end portion of the coil is inserted may have the convex portion formed on the bottom surface and the side surface along the end portion of the coil.

  Further, with respect to the convex portion formed on the bottom surface, from the viewpoint of protecting the coil by storing it in the groove portion, the end portion of the coil protrudes outward from the groove portion as in the invention according to claim 3. It is preferable to set the height dimension not to be set.

  1 to 5 show an embodiment in which a bobbin of a winding member according to the present invention is applied to a bobbin 1 on the primary side of a transformer, which is the same as the conventional one shown in FIGS. Constituent parts are denoted by the same reference numerals and the description thereof is simplified. In FIG. 1, a primary coil and a secondary coil to be described later are not shown.

  In this transformer as well, a primary bobbin 1 and a secondary bobbin 2 are integrally formed. In the bobbin 1 on the primary side, convex portions 22 and 23 are formed on the bottom surface 20 and the side surface 21 of the groove portion 6 formed in the terminal mounting portion 4, respectively.

  Here, the base end portion of the connection terminal 5 protrudes at a position lower than the bottom surface 20 of the groove portion 6 with respect to the upper surface of the terminal mounting portion 4 on which the groove portion 6 is formed. A step portion 20a is formed at the end portion on the 5 side. The step portion 20 a is formed at a position where the height difference from the base end portion of the connection terminal 5 is smaller than the height difference from the bottom surface 20, and the boundary between the step portion 20 a and the bottom surface 20. The convex part 22 is formed in the part. And this convex part 22 is set to the height dimension by which the edge part of the primary coil 3 does not protrude outside from the groove part 6. FIG.

  Moreover, the convex part 23 is formed in the side surface 21 of the side which adjoins as a result of the edge part of the primary coil 3 penetrated in the groove part 6 being drawn around to the connection terminal 5 side. And this convex part 23 is formed in the approximate center of the full length of the groove part 6. FIG.

  In general, the primary coil 3 is formed in such a manner that a wire rod is tangled to the connection terminal 5, inserted into the groove portion 6 and wound around the winding portion by an automatic winding machine or the like. . For this reason, the convex portion 23 formed on the side surface 21 of the groove portion 6 is also high enough to ensure a sufficient space between the opposing side surfaces when the wire rod is inserted into the groove portion 6 by the automatic winding machine or the like. It is formed in the size.

  As a result, the end portion of the primary coil 3 inserted into the groove portion 6 is lifted from the bottom surface 20 and the step portion 20a by the convex portion 22, and line contact with the bottom surface 20 and the step portion 20a is prevented and the convex portion 22 is protruded. The portion 23 is spaced from the side surface 21 and is inserted into the groove portion 6 in a state where line contact with the side surface 21 is prevented.

  In the bobbin 1 on the primary side of the transformer having the above-described configuration, the end portion 3a of the primary coil 3 is inserted into the terminal mounting portion 4 so as to extend between the primary coil 3 and the connection terminal 5. In the secondary bobbin 2 that forms the groove portion 6, the end portion of the secondary coil 7 is inserted into the terminal mounting portion 8 so as to extend between the secondary coil 7 and the binding terminal 9. Since the groove portion 11 is formed, the end portions of the coils 3 and 7 can be prevented from being damaged.

  In addition, with respect to the groove portion 6 into which the end portion 3a of the primary coil 3 directly connected to the connection terminal 5 mounted on the board land is inserted, the side surface 21 along which the bottom surface 20 and the end portion 3a of the primary coil 3 extend. In addition, since the end portions 3a of the primary coil 3 are spaced apart from the bottom surface 20 and the side surface 21 and the convex portions 22 and 23 are formed to prevent line contact with the bottom surface 20 and the side surface 21, soldering is performed. In the process, even when a part of the flux passes through the end portion 3 a of the primary coil 3 and enters the groove portion 6, the end portion 3 a of the primary coil 3 is fixed to the terminal mounting portion 4 in the groove portion 6. There is no.

  In particular, in the bobbin 1 on the primary side, a step portion 20a that is closer to the base end portion side of the connection terminal 5 than the bottom surface 20 side is formed at the end portion of the bottom surface 20 of the groove portion 6 on the connection terminal 5 side. A convex portion 22 is formed at a boundary portion between the step portion 20a and the bottom surface 20. For this reason, the distance between the end 3a and the step 20a can be increased in the opening on the side of the connection terminal 5 of the groove 3 where the flux is likely to enter through the end 3a of the coil 3. Therefore, it is possible to reliably prevent the end portion 3 a of the primary coil 3 from adhering to the terminal mounting portion 4 in the groove portion 6.

  As a result, even when an external force is applied to the connection terminal 5 when it is mounted on the board land, the deformation can be absorbed by the extension at the end portion 3a of the primary coil 3. There is no risk of the secondary coil 3 breaking.

  In the above embodiment, the bobbin according to the present invention is applied to the bobbin 1 on the primary side of the transformer, and only the case where the convex portions 22 and 23 are formed in the groove portion 6 has been described. By applying to the bobbin 2 on the secondary side instead of the one, a similar convex portion can be formed also in the groove portion 11.

  Incidentally, in the bobbin 2 on the secondary side, the end of the secondary coil 7 is connected not to the connection terminal 10 mounted on the board land, but to the binding terminal 9 electrically connected to the connection terminal 10. Yes. For this reason, even if the end of the secondary coil 7 is fixed in the groove 11, as compared with the case where it is directly connected to the connection terminal 5 mounted on the board land like the primary coil 3. Although there is little risk of breakage, the secondary coil 7 is similarly formed even if an external force is applied to the tangled terminal 9 by assembling or transporting it by forming the convex portion. It is possible to prevent breakage.

It is one Embodiment of the bobbin of the winding components which concerns on this invention, Comprising: It is a perspective view which shows the shape which abbreviate | omitted the coil. It is a top view of FIG. FIG. 3 is a front view of FIG. 2. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. FIG. 3 is a left side view of FIG. 2. It is a top view which shows the bobbin of the conventional transformer. FIG. 6 is a left side view. FIG. 7 is a cross-sectional view taken along line BB in FIG. 6.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Primary bobbin 3 Primary coil 3a End part of primary coil 4 Terminal mounting part 5 Connection terminal 6 Groove part 20 Bottom face 21 Side face 22, 23 Convex part

Claims (3)

It is made of a material having electrical insulation, and has a winding portion around which a coil is wound, and a terminal mounting portion formed on the winding portion, and an end portion of the coil is formed on the terminal mounting portion. In the bobbin of the winding component in which the fixed terminal is implanted,
A groove portion extending between the terminal and the coil and extending through the end portion of the coil is formed in the terminal mounting portion, and the end portion of the coil is separated from the bottom surface of the groove portion. Forming a convex portion that prevents line contact with the bottom surface, and making line contact with the side surface with the end portion of the coil spaced apart from the side surface along the side surface of the groove portion along the end of the coil. A bobbin for a winding component, characterized in that a convex portion for preventing the above is formed. The terminal is a connection terminal to which an end of the coil is directly connected and connected to an external connection, and a bottom surface of a groove portion through which the end of the coil fixed to the connection terminal is inserted, and the terminal 2. The bobbin for a winding component according to claim 1 , wherein each of the convex portions is formed on a side surface along which the end of the coil extends.   The bobbin for a winding component according to claim 1 or 2, wherein the convex portion formed on the bottom surface is set to a height dimension such that an end portion of the coil does not protrude outward from the groove portion. .

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