Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F27/00—Details of transformers or inductances, in general
  • H01F27/28—Coils; Windings; Conductive connections
  • H01F27/29—Terminals; Tapping arrangements for signal inductances
  • H01F27/292—Surface mounted devices
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K3/00—Apparatus or processes for manufacturing printed circuits
  • H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
  • H05K3/306—Lead-in-hole components, e.g. affixing or retention before soldering, spacing means
  • H05K3/308—Adaptations of leads
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F27/00—Details of transformers or inductances, in general
  • H01F27/28—Coils; Windings; Conductive connections
  • H01F27/29—Terminals; Tapping arrangements for signal inductances
  • H01F2027/297—Terminals; Tapping arrangements for signal inductances with pin-like terminal to be inserted in hole of printed path

Definitions

• the present invention relates to a coil for mounting a substrate such as a linearity coil, and a mounting structure for the substrate.
• a linearity coil is inserted and connected to a horizontal deflection circuit to correct image distortion of a brown-tube type imaging device used for a television receiver, a personal computer monitor, and the like.
• a pair of lead terminals d and d protrude below a magnetic core b around which a winding a is wound via a magnet c, and the polarity is shown on the upper surface of the magnetic core.
• those forming the mark e as shown in FIG. 9, three rie de terminal d,, d, those projecting a d, and the one d 3 and a polarity determination are known .
• the worker judges the polarity of the lead terminal d of the coil from the mark e, fits the lead terminal d into the predetermined hole of the board, and Implement.
• the coil shown in FIG. 9 is mounted on a board, three holes corresponding to the lead terminals dt, d, and d are also formed on the board.
• the lead terminals, d, and d can be fitted and mounted in the holes of the board without erroneous insertion without any determination of the polarity of d. Disclosure of the invention
• the coil shown in Fig. 8 requires the operator to determine the polarity of the lead terminal d when mounting it on a board, and has the disadvantage that the polarity may be erroneously inserted into a predetermined hole in the board.
• Ah is, with the coil shown in FIG. 9, since there is one extra rie de terminal d 3, lead terminals d,, but erroneous insertion is not to the substrate of the pores of d, the re-mode pin d 3
• the manufacturing cost is increased by the increase and the insertion of the lead terminals d 1, d 2 and d 3 into the hole of the board is troublesome.
• the terminal at the beginning of winding of the winding is connected to the entangled lead terminal.
• the lead terminal to which the terminal at the end of the winding exposed on the outer periphery is entangled tends to take a longer time to wet the solder to the entangled portion. This is one of the causes to increase the thermal fatigue of the coil winding during the soldering.
• the present invention solves the drawbacks of the conventional board mounting coil and the board mounting structure, has a simple structure, can easily determine the polarity of the lead terminal, and makes an error in the judgment of the operator.
• An object of the present invention is to provide a low-cost board mounting coil and a board mounting structure thereof, in which a lead terminal of the coil is not mounted on a board with an incorrect polarity. It is another object of the present invention to provide a board mounting coil which has less thermal fatigue of the winding during the soldering.
• the present invention provides a coil body formed by winding a winding around a magnetic core, a base on which the coil body is mounted, and a winding protruding below the base.
• Board mounting coil having a pair of lead terminals for tying the terminal to the base end, or a coil body formed by winding a coil around a magnetic core, and below the magnetic core
• the pair of lead terminals is defined by claim 1, 2 or 3.
• the cross-sectional areas orthogonal to the axis are different from each other, and the terminal at the end of winding of the winding is one of the pair of lead terminals as described in claim 4. It is preferable to entangle the base end of one lead terminal having a larger cross-sectional area perpendicular to the axis than the other.
• a pair of lead terminals are different in outer shape as described in claim 5, 6 or 7.
• At least one of the lead terminals, which are different in outer shape and which enclose the terminal at the end of winding of the winding, is non-circular, as described in claims 8, 9 or 10. For example, it is preferably a polygon or an ellipse.
• each of the pair of lead terminals is located at a center of a base or a lead terminal mounting portion of a magnetic core. And have cross-sectional shapes that are not dotted.
• each of the pair of lead terminals has the center of the base or the magnetic core.
• Lead terminal mounting It is characterized in that it is arranged so as to be point symmetrical with respect to the center of the joint.
• the above-described board mounting structure of the board mounting coil has a pair of lead terminals having different cross-sectional areas perpendicular to the axis, as described in claim 15, claim 2, 3, or 4.
• the coil is mounted on a substrate by means of (1) and (2), and further comprising a pair of lead terminals having different outer shapes as described in claim (16).
• the coil is mounted on a substrate by combining As described in claim 17, the pair of lead terminals have cross-sectional shapes that are not point-symmetric with respect to the center of the base or the lead terminal mounting portion of the magnetic core, respectively. And a board having a hole corresponding to a pair of lead terminals of the coil, wherein the pair of lead terminals of the coil fit into the holes of the board.
• the coil is mounted on a substrate, and the center of each of the pair of lead terminals is a base or a magnetic core. 15.
• the pair of lead terminals of the board mounting coil have different cross-sectional areas perpendicular to the axis, or have different outer shapes, or each has a base or magnetic core, and the center of the lead terminal mounting part. Since the coils have cross-sectional shapes that are not point-symmetric with each other, the structure is simpler than the conventional coils shown in Figs. 8 and 9, and the man-hours required for coil assembly can be reduced. It can be determined. When mounting these lead terminals on a board, the board must be mounted on the board with respect to the cross-sectional area orthogonal to the axis, the outer shape, or the center of the base or the base of the magnetic core.
• the coil having the lead terminals mounted thereon such that the center of each of the pair of lead terminals is located at a point symmetrical position with respect to the center of the base or the lead terminal mounting portion of the magnetic core, When this is mounted on a board, the magnetostrictive vibration of the magnetic core due to the current flowing through the winding does not occur unevenly, so that the reliability of mounting the coil is improved.
• the pair of lead terminals may have a cross-sectional area, shape, or a cross-sectional shape that is not point-symmetrical only at the substrate insertion portion. In this case, the conventional equipment can be used except for the processing of the lead terminals, and the production can be performed at lower cost.
• one of the pair of lead terminals has a larger cross-sectional area perpendicular to the axis than the other, so that the heat conduction of the one lead terminal is better than that of the other. .
• the terminal at the end of the winding is tied to the base end of the one lead terminal, so that the tied part is immersed in the molten solder layer and soldered.
• the structure is simple, the polarity of the lead terminal can be easily determined, and the lead terminal of the coil has the wrong polarity due to an erroneous judgment by the operator. This has the effect of obtaining a low-cost board mounting coil that is not mounted on a board and its board mounting structure.
• the present invention has an effect that a board mounting coil and a board mounting structure with less thermal fatigue of a winding can be obtained.
• FIGS. 1 (A) and 1 (B) are a perspective view of an example of a board mounting coil according to the present invention and a partially cut front view of a board mounting structure of the coil.
• FIGS. 2A and 2B are a perspective view of another example of the board mounting coil according to the present invention and a partially cutaway front view of the board mounting structure of the coil.
• FIGS. 3A and 3B are a bottom view and a front view of a main part of a modification of the board mounting coil shown in FIGS. 1 and 2, respectively.
• FIGS. 5A and 5B are a front view and a bottom view of another example corresponding to the lead terminals of the board mounting coil shown in FIG.
• FIGS. 6 (A), (B) and (C) are bottom views of still another example of a lead terminal of a coil for mounting on a board.
• 7A and 7B are a front view and a bottom view of another example corresponding to the lead terminals of the board mounting coil shown in FIG.
• FIG. 1 shows an example of a board mounting coil of the present invention applied to a linearity coil and a board mounting structure of the coil.
• reference numeral 1 denotes a coil body, which is, for example, a dram-shaped magnetic core 2 made of ferrite, and a wire is coated with a resin, for example, 0.6 ⁇ of polyurethane or polyester.
• a winding 3 made of a conductive wire is wound around and mounted on the base 4 via a vibration-absorbing material sheet 5 having elasticity such as silicone rubber or synthetic rubber as required.
• the base 4 is made of, for example, resin and has a lead terminal mounting portion 4a, for example, a pair of lead terminals 6a and 6b projecting downward on the lower surface thereof.
• Terminals 7a, 6a, 6b of the winding 3 led downward through the holes of the base 4 at the base ends
• Reference numeral 8 denotes a cylindrical magnet for a bias bonded to the upper surface of the magnetic core 2.
• the lead terminal 6a is a cross section perpendicular to the axis from 6b.
• the product is small, for example, has a thickness of 0 . ⁇ , and the terminal 7a at the beginning of winding 3 is entangled with this base end, and the lead terminal 6b is 6a
• the terminal 7b at the end of the winding 3 is entangled with the base end of the winding 3 having a larger cross-sectional area perpendicular to the axis, for example, having a thickness of 1.0 mm ⁇ i).
• the lead terminal 6b Since the lead terminal 6b has a large cross-sectional area perpendicular to the axis, after winding the winding 3 around the magnetic core 2, wrap the terminal 7b at the end of winding 3 and cut off the excess conductor. In this case, deformation of the lead terminal 6b can be prevented, and loosening of the winding 3 can be prevented. Further, by immersing the entangled portion of the winding end in a molten solder bath, the resin coating of the winding is melted and removed, and the winding ends 7a and 7b and the rewinding end are removed. — Terminals 6a and 6b are soldered.
• the lead terminal 6b to which the terminal 7b at the end of winding of the winding is entangled is connected to the axis from the lead terminal 6a to which the terminal 7a at the beginning of winding of the winding is entangled. Since the cross-sectional area at right angles is large, the heat conduction from the molten solder tank via the lead terminals is good, and the wetting of the solder to the binding part of the terminal 7b at the end of winding is prevented. Since this is accelerated, the time required for soldering can be shortened, and the thermal fatigue of the coil winding can be reduced.
• the lead terminals 6a and 6b can have the cross-sectional area perpendicular to the axis thereof reversed.
• the lead terminals 6 a and 6 b may be protrudingly provided on the lead terminal mounting portion 2 a of the drum type magnetic core 2, for example, on the lower surface of the lower flange.
• Reference numeral 9 denotes a board on which the board mounting coil is mounted.
• the coil mounting portion has a pair of holes 10a and 10a having a size corresponding to the pair of lead terminals 6a and 6b of the coil. 10 0b is formed. Therefore, when the pair of lead terminals 6a and 6b of the board mounting coil are fitted into the pair of holes 10a and 10b of the board, the operator does not need to judge the polarity of the coil.
• the coil can be mounted on the board properly and easily.
• FIG. 2 shows an example of a board mounting coil of the present invention applied to a general coil and a board mounting structure of the coil.
• reference numeral 1 denotes a coil body, which is formed by winding a winding 3 of a conductive wire coated with the same resin as above on a drum type magnetic core 2 made of ferrite, for example.
• a pair of lead terminals 6a and 6b project downward from the lower surface of the lead wire mounting portion 2a, that is, the lower surface of the lower flange.
• the lead terminals 6a and 6b also have a smaller cross-sectional area perpendicular to the axis than the lead terminals 6a, as described above. 8 ⁇ ⁇ ⁇ Thickness, the terminal 7a at the beginning of winding 3 is wound around this base end, and the lead terminal 6b has a cross-sectional area perpendicular to the axis from 6a.
• the solder terminals 6a and 6b are soldered.
• the lead terminal 6b to which the terminal 7b at the end of winding of the winding is entangled is orthogonal to the axis from the lead terminal 6a to which the terminal 7a at the beginning of winding of the winding is entangled.
• Large cross-sectional area heat conduction from the molten solder tank via the lead terminals is good, and solder wetting and swelling at the end of the winding 7b at the end of winding is promoted.
• the time required for soldering can be shortened, and the thermal fatigue of the coil winding can be reduced.
• the lead terminals 6a and 6b can have the cross-sectional area perpendicular to the axis thereof reversed. Also, when using a base on which the magnetic core 2 around which the winding 3 is wound is mounted, and the lead terminals 6a and 6b are protruded from the lead terminal mounting portion of the base, for example, the lower surface. Good.
• the board 9 on which this coil is mounted is the same as that shown in FIG.
• one of the lead terminals 6a and 6b of the board mounting coil shown in FIG. 1 or FIG. 2 one of the lead terminals 6a and 6b having the same thickness as shown in FIG. Only the board insertion portion i of the board terminal 6b (at the time of mounting on the board, a position fitted into the hole of the board or a position below the board) may be thickened, for example, into a bump.
• one of the lead terminals 6b which connects the terminal 7b at the end of the winding 3 to the outside, has an outer shape of 3
• a square, quadrangular or hexagonal one with an elliptical outer shape, and the other lead terminal 6a around the terminal 7a at the beginning of winding Thus, for example, circular ones each having a different outer shape from 6 b can be used.
• the coil mounting part has the same shape as the lead terminals 6a and 6b, as in the coil mounting structure shown in Fig. 1 or 2.
• a substrate on which (not shown) is formed is used. Therefore, when the lead terminals 6a and 6b of the coil are fitted into the pair of holes of the board, the worker can properly and easily attach the coil to the board without judging the polarity of the coil. Can be implemented.
• the outer shape of the lead terminals 6a and 6b is not limited to a combination of a polygon or an ellipse and a circle, and various deformations may occur if the outer shapes of the lead terminals 6a and 6b are different. Can be considered.
• the lead terminals having the same circular cross section are used as shown in FIG.
• the lead terminals 6a and 6b of the board insertion portion i for example, 6b, which is to be fitted into the hole of the board or a position below the board when the board is mounted
• the lead terminals 6a and 6b of FIG. 5 and this modification are used, a board having holes corresponding to the shapes of the lead terminals 6a and 6b formed in the coil mounting portion as described above. (Not shown) of course.
• FIGS. 6 (A), 6 (B) and 6 (C) show still other examples of the lead terminals provided on the board mounting coil shown in FIG. 1 or FIG.
• the lead terminals 6a and 6b shown in the same figure have the same sectional shape, but the lead terminal mounting part 2a of the magnetic core 2 or the lead terminal mounting of the base 4 It has a cross-sectional shape that is not point-symmetric with respect to the center 11 of the part 4a.
• the lead terminals 6a and 6b shown in Fig. 6 (A) have rectangular cross sections of the same size, but the lead terminals tied to the terminal 7b (not shown) at the end of winding. While 6b is horizontal, the lead terminal 6a, which is tied to the terminal 7a (not shown) at the beginning of winding, is arranged vertically, and the lead terminal shown in FIG.
• the lead terminals 6a and 6b are triangles of the same size and oriented in the same direction.
• the one shown in Fig. 6 (C) has an elliptical cross section of the same size.
• one lead terminal 6b is arranged vertically while the other lead terminal 6b is arranged horizontally.
• the cross-sectional shapes of the lead terminals 6a and 6b satisfy the condition that they are not point-symmetric with respect to the center 11 of the lead terminal mounting portions 2a and 4a as described above.
• the invention is not limited to the illustrated one.
• Lead terminal 6 for cutting the excess conductor by tangling the terminal 7 b at the end of winding of winding 3 with the wetting of the solder If it is necessary to consider the prevention of deformation of b, the lead terminal 6b has a cross-sectional area perpendicular to its axis, as shown in Fig. 1, 2 or 4. It can be larger.
• a board having a hole corresponding to the cross-sectional shape of the lead terminals 6a and 6b Is prepared, and the coil is mounted on it.
• the lead terminals 6a and 6b shown in Fig. 7 have the same narrow flat plate shape, and the lead terminal mounting part 2a of the magnetic core 2 or the lead terminal mounting of the base 4 Although the shape is point-symmetric with respect to the center of the portion 4a, one of the board insertion portions i (the position where the hole is fitted into the hole of the substrate or the position below the substrate when mounting the substrate) is, for example, 9 It is twisted 0 degrees to change the direction, and only that part is formed into a shape that is not point symmetric.
• the lead terminals 6 a and 6 b shown in FIGS. 1 to 7 have their respective centers (cross sections) 12 and 12 at the lead terminal mounting portion 2 a of the magnetic core 2 or the lead of the base 4.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Coils Or Transformers For Communication (AREA)

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Publications (1)

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ID=15632114

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Citations (6)

• 1998
  • 1998-06-10 CN CN 98800805 patent/CN1229516A/zh active Pending
  • 1998-06-10 WO PCT/JP1998/002561 patent/WO1998057340A1/ja active Application Filing

Patent Citations (6)

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