JP3059461U - Ultra small molded coil - Google Patents

Abstract

(57) [Summary] [Problem] To improve the attraction to an assembling arm of an automatic assembling device and the mountability to a printed wiring board, to prevent rotation due to vibration, etc., and to make a solder terminal a very short tip of only a ground plane. Only the part can be accurately soldered as the ultra-short solder terminal 2, and the stray capacitance of the capacitor is reduced, Q is improved, and legs for preventing rotation are made unnecessary.
Eliminates deformation of the form due to springback, and enables easy production with high precision. A cylindrical coil (1) formed by spirally winding an insulated conductive wire (11) is formed into a rectangular tube, flat tube, or tunnel shape by press molding, and only corresponds to the ground plane at the coil end. The ultra-short solder terminal 2 provided with the insulating coating was peeled off and subjected to solder plating 21 at the very short end of the.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a cylindrical microminiature formed coil.

[0002]

[Prior art]

 The size and ultra-miniaturization of surface-mounted electronic components on printed wiring boards are rapidly progressing, and coils are no exception.Recently, air-core coils have conductive coating with an insulating coating on the surface. Ultra-small ones in which a thin wire is spirally wound into a cylindrical shape with an outer diameter of about 0.65 mm and a length of about 1.25 mm have also appeared. Since this microminiature coil has a cylindrical shape, it has no directionality as a coil and is relatively easy to produce even though it is microminiature. When mounting the microminiature coil on a printed wiring board, like other various electronic components, it is individually housed in an appropriate storage section of an embossed tape to be mounted on a reel in an automatic assembly device, and the embossed tape is fed out. With the built-in arm of the device, which operates synchronously with the device, it is vacuum-adsorbed to the tip of the device, taken out, and mounted on a printed circuit board.

[0003]

[Problems to be solved by the invention]

 However, this cylindrical micro coil has the following problems. An ultra-small and cylindrical coil has poor adsorbability to the above-mentioned built-in arm and poor mountability. Since it is cylindrical, it rotates even in the embossed tape storage section due to vibrations, etc., so the solder terminal at the coil end cannot be made only a very short tip, which is only the ground plane. The winding must be secured as a solder terminal. As described above, when the solder terminal is long, the stray capacitance of the capacitor is increased, and the Q is deteriorated. On the other hand, if it is attempted to prevent the embossed tape from rotating due to vibrations or the like in the storage portion, it is necessary to extend the legs, which makes the processing difficult and increases the cost. In addition, the provision of the legs makes it difficult to store in the storage section. It is conceivable to use a square tube shape or the like to prevent rotation.However, in the case of an air-core coil, if the wire is wound around a square or other core material and then pulled out, the coil will be twisted by the spring back. As a result, it cannot be formed into an appropriate square tube or the like, which makes production difficult. The present invention seeks to solve these problems.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the invention of a square-shaped ultra-small shaped coil according to claim 1 is to form a cylindrical coil 1 in which an insulating coated conductive wire 11 is spirally wound into a square-tube shape by press forming. At the very short end corresponding to the ground plane at the coil end, an ultra-short solder terminal 2 having an insulating coating removed and plated with solder 21 is provided.

[0005] A flat cylindrical microminiature shaped coil according to a second aspect of the present invention is to form a cylindrical coil 1 in which an insulated conductive thin wire 11 is spirally wound into a flat cylindrical shape by press molding, and An extremely short solder terminal 2 provided with a solder jack 21 by stripping an insulating coating is provided at an extremely short tip portion corresponding to the ground plane of the coil end.

A third aspect of the present invention relates to a tunnel-shaped microminiature shaped coil, in which a cylindrical coil 1 in which an insulated conductive wire 11 is spirally wound is formed into a tunnel shape by press molding, and An ultra-short solder terminal 2 provided with a very short end corresponding to the ground plane at the coil end and having been subjected to solder plating 21 by stripping an insulating coating.

[0007]

[Embodiment of the invention]

 Part 1. FIG. 1 and FIG. 2 show an embodiment relating to a square cylindrical air core microminiature molding coil according to the invention of claim 1. This microminiature shaped coil is formed by spirally winding an insulated copper wire (enameled wire: 2 types of PEW, etc.) having a wire diameter of about 0.11 mm, which is a conductive fine wire 11 having an insulating film 12 on the surface, and having an outer diameter of about 0.11 mm. A cylindrical air core microminiature coil 1 of about 0.65 mm in length and about 1.25 mm in length is formed, and the cylindrical coil is further press-formed to form a square tube having a width of about 0.6 mm and a length of about 1.25 mm. And an ultra-short solder terminal 2 formed by peeling the insulating film 12 and applying a solder plating 21 to an extremely short tip portion corresponding to the ground plane at both ends of the coil. .

In order to manufacture the micro compact coil, first, the above-mentioned insulated copper wire, which is a conductive wire 11 having a predetermined length with an insulative film 12 formed on the surface thereof, is placed on both ends where an extremely short solder terminal is provided. Is peeled off, solder plating 21 is applied, and as shown in FIG. 7 (1), it is wound around a core material A of a round and thin rod to form a cylindrical air-core microminiature coil having an outer diameter of about 0.65 mm. Is prepared. The cylindrical air core microminiature coil 1 formed in this way generates a certain springback when the core material A is pulled out, but maintains the cylindrical shape. Next, as shown in FIG. 7 (2), a core material B of a square rod is inserted into the cylindrical air-core coil 1 and a V-groove is formed on both sides of the core material B on the outside thereof. A pair of press dies C 1 and C 2 are pressed against each other to press-form the coil 1 having a rectangular cylindrical air core. This press forming also causes springback, but it is very slight and does not twist, so it maintains a square cylindrical shape. At this time, both ends of the insulated copper wire that has been initially plated with solder 21 become the extremely short solder terminals 2 at both ends of the coil.

[0009] The manufactured rectangular cylindrical microminiature coil is used as one of the electronic components in the above-mentioned automatic assembling apparatus individually and in a predetermined direction and posture in an appropriate storage portion of an embossed tape to be mounted on a reel. Then, the embossed tape is vacuum-adsorbed to the tip of the embossed tape by a built-in arm that operates in synchronization with the feeding of the embossed tape, taken out, and mounted on a printed wiring board.

[0010] 2. 3 and 4 show an embodiment relating to a flat cylindrical air core microminiature molding coil according to the invention of claim 2. FIG. This micro coil 1 is formed into a flat cylindrical shape with a width of 0.6 mm or more in the micro coil 1 of FIGS. Others are the same as those in FIGS. 1 and 2.

The manufacture of the micro coil 1 is the same as that of FIG. 7 except that a core material of a flat bar and a press die for a flat cylinder are used. 1 and FIG. 2 is also the same as that of FIG. 1 and FIG.

Part 3. 5 and 6 show an embodiment relating to a tunnel-shaped air core microminiature coil according to the invention of claim 3. This microminiature coil 1 is the same as the microminiature coil 1 shown in FIGS. 1 and 2 except that it is formed in a tunnel shape. Are the same as those in FIG. In addition, surface mounting of the electronic component on a principal part of the printed wiring board as one of the electronic components is the same as in the case of FIGS.

In the above embodiment, the air-core microminiature coil 1 is used, but ferrite, ceramic, or the like may be inserted.

[0014]

[Effect of the invention]

 According to the present invention, the following effects can be obtained. Since the coil 1 is not a cylinder but a rectangular cylinder, a flat cylinder, or a tunnel, it has good adsorbability to the built-in arm of the automatic mounting device and good mountability to the printed wiring board. Since the coil is not a cylinder but a rectangular cylinder, flat cylinder or tunnel-shaped microminiature coil 1, even if it is stored in the storage section of the embossed tape used in the automatic assembling device, it will rotate in the storage section due to vibration or the like. Therefore, a fixed direction and orientation for mounting can be maintained and secured in the housing. Therefore, the solder terminal at the coil end can be used as an ultra-short solder terminal 2 having only a very short tip only of the ground plane. It can be soldered to. In this way, the solder terminal can be used as the ultra-short solder terminal 2 only at the very short tip of the ground plane only, and it is not necessary to extend the length to one turn. Can be improved. There is no need to extend the legs in order to prevent the embossed tape from rotating in the storage section. Therefore, there is no difficulty in processing, increase in cost, and storage in the storage section. Since the cylindrical coil is formed into a rectangular tube, a flat tube, or a tunnel by press molding, it can be easily manufactured with high accuracy without deformation due to springback.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the invention of claim 1; FIG.

FIG. 2 is a side view of the same.

FIG. 3 is an embodiment of the invention of claim 2; FIG.

FIG. 4 is a side view of the same.

FIG. 5 is a diagram showing a third embodiment of the present invention; FIG.

FIG. 6 is a side view of the same.

FIG. 7 is an embodiment of the invention of claim 1; FIG. 4 is an explanatory view showing a manufacturing procedure according to the first embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Coil 2 ... Very short solder terminal 11 ... Conductive thin wire 12 ... Insulating film 21 ... Solder plating A ... Core material of round thin rod B ... Core material of square thin rod C ... Press type

Claims (3)

[Utility model registration claims] 1. A cylindrical microminiature coil 1 formed by spirally winding an insulated conductive thin wire 11 is formed into a rectangular cylindrical shape by press molding, and has a very short end corresponding to a ground surface at the coil end. An ultra-small rectangular tube-shaped coil formed by providing an ultra-short solder terminal 2 in which the insulating coating is stripped and solder plated 21 is provided. 2. A cylindrical microminiature coil 1 in which an insulated conductive thin wire 11 is spirally wound, is formed into a flat cylindrical shape by press molding, and has a very short tip corresponding to a ground surface at the coil end. A flat cylindrical microminiature formed coil having an extremely short solder terminal 2 provided with a solder plating 21 by stripping an insulating coating on a portion thereof. 3. A cylindrical microminiature coil 1 in which an insulated conductive wire 11 is spirally wound, is formed into a tunnel shape by press molding, and has a very short end portion corresponding to a ground surface at the coil end. And a tunnel-shaped ultra-small molded coil comprising an ultra-short solder terminal 2 having an insulating coating removed and plated with solder 21.