JPS6015905A - Inductive parts - Google Patents

Abstract

PURPOSE:To reduce line-to-line capacity of an inductive parts, and to enable to be used in a high-frequency region by a method wherein a zigzag type conductive pattern is formed on an insulating substrate in the condition interposing an interval mutually. CONSTITUTION:An insulating substrate 1 is constructed of a material having flexibility, conductive foil 2 is formed on the surface on one side according to evaporation of copper, etc. for example, and etching is performed properly to leave a conductive pattern 3 extending in a zigzag type on the insultating substrate 1. Then slits 4 of the plural number of pieces are formed penetrating the insulating substrate 1, and cores 5 are inserted in order in the respective slits 4 making the extending regions of the conductive pattern 3 interposed between the respective slits 4 of the plural number of pieces to be in the condition curved upward and downward alternately utilizing flexibility of the insulating substrate 1. The conductive pattern 3 extends spirally substantially at the peripheries of the cores 5 in this condition, and when both edge parts are used as terminals 6, 7, an inductance value L can be obtained between the terminals thereof.

Description

[Detailed description of the invention]

FIELD OF THE INVENTION The present invention relates to inductive components including coils, inductors, transformers, etc., and in particular to inductive components of the type in which a coil is formed on a sheet-like substrate to obtain inductance. It is. Description of the Prior Art For example, in the case of a coil 1518, a conductive wire is often wound around a core or a bobbin, or a spiral conductive pattern is formed on a single insulating substrate. However, the coils obtained by these methods have the following drawbacks. The coil obtained by winding the conductor wire has a large line capacitance,
It cannot be used in a high frequency range, and the frequency range of several to several tens of MH7 is the limit. In addition, the height dimension is relatively large, which hinders miniaturization of equipment in which it is incorporated. Further, in a coil obtained by forming a spiral S-electrode pattern on an insulating substrate, it is not possible to have a large inductance. In order to increase this inductance, it is necessary to have a multilayer structure. Furthermore, manufacturing these cables requires a great deal of time and cost. Regarding the specific IC1 transformer, the conventional typical 1-8 ounce shape is close to 1 cubic inch, so the height dimension of 1° is naturally large, and the 1st winding is Since the winding is concentrically twisted, the stray sound between the cap and the coil is 1t)pF, 20p[or toOpI
``'', which inevitably results in suppressing the transformer's protectable frequency range and pulse response.Furthermore, as an inductive component, 'There is an f8 electric bar to which a nguctance component is applied. Conventional power supply bars are made by attaching the power supply terminal to a copper plate in the form of
] Insulate! , :(Hesako, or 1.t2 pieces of gold B b
:<All used UE-cQ IgJ with a capacitor interposed and Hinoki 3. However, the drawbacks of the conventional ↓ii 712 bar are that it has a small inductance, is difficult to handle at high frequencies, and has a steep rise of 100
! vI 14 For pulse noise in the z band, C is
That means it's not effective at all. Furthermore, the object of this invention is to provide an inductive component that has a small storage capacity and can be used in a high frequency range without any problems even when the current is high. Another object of the present invention is to provide an inductive component that can have an overall thin shape and is fully compatible with thinner designs of equipment. Yet another object of the invention is to provide an inductive component that can be manufactured at low cost and efficiently. Summary of the Invention In this invention, a flexible insulating substrate made of, for example, a resin sheet is used. Regarding the flexibility of the insulating substrate, it is sufficient that it has such flexibility at least in stage III of the manufacturing process.
When the inductive part is made into a finished product, it may lose its flexibility. A conductive pattern extending in a zigzag pattern is formed on at least one surface of such an insulating substrate. Then, in the area between the zigzag conductive patterns (
At \, a plurality of slits are formed through the insulating substrate. A core is combined with such an insulating substrate. That is, the core is sequentially inserted into each of the slits so that the extending regions of the conductive patterns sandwiched between the plurality of slits are alternately located above and below. This state of inserting the core into the slit is just like sewing an insulating substrate equivalent to cloth using the core as a needle. Effects of the Invention According to the present invention, the zigzag-shaped conductive patterns are formed on an insulating substrate at intervals, so that the line-to-line conductivity is reduced by, for example, 1 compared to a conventional coil. /4~1. /10fff1 degree, and can be used without problems even in high frequency ranges. Therefore, the usable frequency range is, for example, 2 to 3 times 1! i! In addition, since it can be made thin as a whole, it is possible to directly attach it to a printed circuit board or to embed it directly in the printed circuit board itself. Also, you can arbitrarily set the cross-sectional area and M magnetic coefficient of the material inserted as the core to 31! Inductive components with several different inductances can be obtained from an insulating MFi with one type of conductive pattern. Furthermore, the inductive component obtained according to the invention has a wide variety of uses, as will be made clear in the following description of the examples. DESCRIPTION OF EMBODIMENTS FIGS. 1 to 6 are diagrams for explaining a coil as an embodiment of the present invention. These drawings are shown according to the manufacturing process flow for obtaining the coil. Therefore, while explaining the coil manufacturing procedure, the construction of the coil will be clearly explained. First, an insulating substrate 1 is shown in a plan view in FIG. 1 and in an enlarged side view in FIG. The insulating substrate 1 is made of a material having a property of +1:1, and films such as polycarbonate and polyimide are exemplified. The flexibility of the substrate 1 is a
The carp as a finished product must be retained even at the completed stage. This is necessary only during the transition process from step 1 of FIG. 5 to step 1 of FIG. The wire 2 is suitably edged at a predetermined portion, leaving a conductive pattern 3 extending in a zigzag pattern on the insulation 11, as shown in Figure 3. As shown in the figure, in the area between the zigzag conductive patterns 3, a plurality of sulins 1-4 are formed by penetrating the insulating substrate 1. Utilizing the flexibility of the seat A1, the extending regions of the 3D pattern 3 sandwiched between each of the plurality of slits 4 are alternately curved upward and downward.IH et al. The cores are inserted into each of the slots 1 to 4 in turn. In this situation, the cores 5 are placed between the first and second slots, which will alternately position the two sandwiched areas between each of the prints 4. 5
As can be seen from FIG. 6, which shows an enlarged side view of the figure, the conductive pattern 3 is in this state the core 5.
The fruit 7 will extend in a spiral shape around the area. In the structure shown in FIG. 5 in which ferrite, for example, is used as the material for forming the core 5, if both (m) portions of the conductive turn 3 are terminals 6.7, these terminals 6.7B are , the inductance value given by the following formula is calculated: L=K (SN27a> where K is a constant, S is the cross-sectional area of the coil, tl is the number of turns,
The mark indicates the length of the coil, that is, the length of conductivity/(turn 3).As is clear from the above equation, by changing the cross-sectional shape of the core 5, while using a constant insulating substrate 1, The cross-sectional area S of the coil can be changed, and therefore the inductance value can be changed arbitrarily.In other words, in order to obtain the minimum inductance value, the cross-section of the core 5 should be made more like a fan. Conversely, if you want to obtain the maximum inductance value, you can make the cross section of the core 5 circular.In this way, you can adjust the inductance as desired or obtain the desired inductance value. Figure 7 shows the coil obtained as described above finished into a chip shape.In other words, if a chip-shaped coil is desired, While covering the structure shown in FIG.
9.10 may be electrically connected. Although not shown, leads can be inserted into the terminals 6 and 7 of the conductive pattern 3 shown in FIG. 5 to form the coil 1 with leads. FIG. 8 shows a preferred configuration when the coil is used as part of a circuit element. In FIG. 8, J3 is used, and a flexible printed circuit board '11 is used.
This Grishi [Circuit Jm (IM 1'l l; = 6-connection coil is formed]) is subjected to cutting. and explain!ζ
In the example above, the coil is formed in the same way as in the previous case. Therefore, the detailed explanation will be omitted by assigning the same reference numerals to the corresponding parts.The number and position of the coils on the printed circuit board 11 in FIG. Such a coil can typically be used, for example, as a high-frequency choke coil inserted in the front stage of a choke bus capacitor.Of course, other circuits can be Parts binding (can also be used. Figure 9

[, L is a plane opening showing an example of a variable inductor, and FIG. 10 is an enlarged side view of FIG. 9. When obtaining a variable inductor, the hollow duct 12 may be inserted instead of the step of inserting the core 5 shown in FIG. 5 described in 111J. In this hollow duct 12, there is an inductance lv! Core 1 consisting of 1 light etc. for aS)
Insert 3 into the fly 1st nail 4' L L! good. If this core 13 is moved by a C piston inside the hollow duct 12,
The inductance value can be adjusted. Note that parts corresponding to those shown in FIG. 5 are given the same reference numerals, and the above description is used for the other configurations. This type of variable inductor can be advantageously used, for example, as a variable inductor for a car radio, or as an IFI coil or a filter coil, and in either case, the overall shape is flat. It can be provided with a thickness of, for example, 5 mmJ, which is advantageous for making devices thinner and smaller. In addition, the variable A2] noductor as shown in No. 9vQ, P
Although it is possible to attach the product to the printed circuit board using the product J and (), as in the example in Fig. 8, it is possible to
It is also possible to assemble it using a part of the printed circuit board. 11 to 15 show examples of transformers 71('1
Jc FIG. 11 shows the elements that make up the primary coil f side of the transformer. The elements shown in FIG. 11 are fiK+3! l; L, conductive pattern 3 in Figure 3
The insulating film 14 is pasted on the insulating substrate 1 on which the conductive patterns 3 are formed, and the insulating film 1I and the insulating substrate 1 are cut into the insulating film 1I and the insulating film 14 in the area corresponding to the area between the conductive patterns 3. was formed. The insulating film 14 can be made of, for example, a polyester film coated with an adhesive. Note that the insulating film 14 is connected to the terminal 6 of the conductive pattern 3.
, 7 are exposed. FIG. 12 shows elements constituting the secondary coil side of the transformer. The elements shown in FIG. 12 can be calculated in a similar manner to the elements not shown in FIG. 11. That is, an insulating substrate 1a is prepared, a conductive pattern extending in a zigzag pattern is formed on it, an insulating film 14a is pasted on the conductive pattern leaving the terminals 5a and 7a, and a plurality of By forming the rib h15a, the element shown in FIG. 12 is obtained. In addition, in FIG. 12, it is clear that the formation density of the slits t'' 15a is denser than that of the slits 1b in FIG. 11, and the formation density of the 4-city pattern is also 1.Although this 811 Bakun is not shown, it extends through the area sandwiched between each slit 15a.
? ). As if you were an incompetent person, it's your turn to see the one shown in Figure 12.
Compared to 0 shown in the figure, it has more turns l\°ζ:
]-r outside, will be realized. As shown in Figures 13 to 15, for each element shown in Figures 1''1 and 12, 5ri!
A core 16.17 made of ferrite, for example, is inserted between each slit 15.15a in a manner similar to that shown in FIG. Then, the two are laid one on top of the other through a slot 18 of an appropriate thickness, and fixed with a screw 19, for example. 16.17 provides a common path for C1 to the two conductive patterns extending to each core 16, 17... ;1ζ is formed.Such a l-lasis (:j3, -core f6.
By using J7' (with a flat cross section of 1τ7F), the thickness of the whole system can be made thinner, and a thinner transformer can be obtained. If desired, e.g.
The configurations shown in FIGS. 6 to 18 may be adopted. Referring to FIG. 16, an example is shown in which each of the elements shown in FIGS. 11 and 12 described above is constructed on one insulating substrate 1b. The upper half of this insulating substrate 1b in the figure has the configuration shown in FIG. 11, and the lower half has the configuration shown in FIG. 12. Therefore, corresponding parts are given the same reference numerals to clarify their correspondence. Note that in this example, one common insulating film 14b is used. Referring to FIG. 17, a generally L-shaped flat core 20.21 made of ferrite is pushed into each slit 15.158. This insertion corresponds to the fifth
This is basically the same as the case of the core 5 shown in the figure. The cores 20, 21 are fixed to each other by, for example, screws 23 via spacers 22 of appropriate thickness. According to the thus obtained transformers shown in FIGS. 17 and 18, the thickness can be made approximately 1/2 that of the transformers shown in FIGS. 13 to 15 described above. By applying this embodiment, it is possible to construct a transformer directly on a flexible printed circuit board using a concept similar to that shown in FIG. 8 described above. In addition, in the examples of each of the above-mentioned transformers, the one illustrated is only an example, and for example, the number of turns of each coil on the primary side and the secondary side can be arbitrarily selected according to the design. In this way, the transformer constructed using this invention is
As a high frequency transformer and a pulse transformer,
More specifically, it is suitable as a switch regulator transformer, a flyback transformer, etc. The thickness of the transformer itself can be made extremely thin, for example, 5 to 10 m+i. FIGS. 19 to 22 are diagrams for explaining a power supply bar provided with inductance as yet another example of the inductive component, that is, an inductive power supply bar. In order to obtain such a power supply bar, first, an insulating substrate 25 on which a zigzag conductive pattern 24 as shown in FIG. 19 is formed is prepared. The method of forming the conductive pattern 24, the material of the insulating substrate 25, etc. are the same as those of the conductive pattern 3, insulating substrate 1, etc. described above. Next, as shown in FIG. 20, in the area between the zigzag conductive patterns 24, the insulating substrate 25 is penetrated.
A plurality of slits 26 are formed. A conductive pattern 24 sandwiched between each of the plurality of slits 26
The cores 27 are sequentially inserted into each slit 26, with the extending regions of the cores 27 being alternately positioned above and below. core 27
For example, it is preferable to use a highly magnetic and flexible material such as a band-shaped ferrite rubber. Note that, depending on the required inductance of the power supply bar to be obtained, the core 27 may be formed of, for example, a hollow insulating pipe instead of such ferrite rubber. Then, a plurality of extraction terminals 28 are connected to appropriate locations on the conductive pattern 24. Although FIG. 21 is shown on a different scale from FIGS. 19 and 20 described above, next, as shown in FIG. It is covered with an insulating tube 29. FIG. 22 shows ta? as the finished product obtained in FIG. 21. The electrical equivalent circuit of 1m bar is shown. That is, an inductance component is formed between each extraction terminal 28. Note that the above-described power supply bar can also be made into a power supply bar having an electrical equivalent circuit as shown in FIG. 23 by making slight changes. In FIG. 23, a bypass capacitor is connected to each extraction terminal 28. If such a bias capacitor is constituted by a feed-through capacitor through which each output terminal 8 is inserted, the noise absorption effect in the high frequency range can be further improved. Since the power supply bar shown in FIGS. 21 and 22 described above can be given a large inductance, it can be operated as a choke coil that effectively absorbs noise such as noise with a steep rise in the high frequency range. I can do it. Furthermore, depending on the magnetic permeability μ of the magnetic material used as the core 27, it is possible to obtain an inductance per unit length of almost any value, and a design 81 tailored to the frequency band of the noise to be removed can be realized with the same dimensions. Is possible. The embodiments of the present invention have been described above while illustrating specific parts that can be applied as the inductive parts of the present invention. The present invention can also be applied to sexual parts. As mentioned above, this invention is characterized by the combination of the insulating substrate and the core, but since the shape of the core, especially the cross-sectional shape, is arbitrary, it is possible to insert the core into the slit. The direction is arbitrary. For example, the core 5 having a cross-sectional shape as shown in FIG. 6 may be inserted in an orientation rotated approximately 90 degrees with respect to the orientation shown in the diagram, and the orientation 901 and the orientation in FIG. It may be inserted in any intermediate orientation. Furthermore, the cross-sectional shape of the core is not limited to the flat rectangle adopted in many embodiments, but may also be a square with other vertical and horizontal ratios, another square, or a circle. , ellipse or ellipse. Further, since a flexible insulating substrate is used, after the core is inserted, the overall shape of the jP1 edge plate substrate is controlled by the shape of the core. Therefore, depending on the mounting position or mounting condition of such an inductive component, the core may be formed with a curved surface, and the overall shape of the inductive component may be curved. The direction of this curvature can be given either in the length direction of the core or in the width direction of the core. In the above description, the insulating substrate has been described as having flexibility, but it is sufficient that the insulating substrate has this flexibility in at least one step of the manufacturing process of the inductive component. Therefore, the material constituting the insulating substrate is
The insulating substrate may be hardened by applying an appropriate treatment later, and the insulating substrate may lose its flexibility in the finished inductive component. In addition, in the state shown in the drawing, the core is linear (understood as extending, but a flexible core is used and the core is also deformed into a wave shape.
It may be inserted into each slit. Furthermore, in each of the embodiments described above, the slits were formed penetrating the insulating substrate in all the regions between the zigzag-shaped conductive patterns, but for example, the slits could not be formed in all the regions between the conductive patterns. It is also possible to form slits in the region between every other conductive pattern, or to form slits in every other conductive pattern or more. In addition, while forming slits in all areas between conductive patterns,
It is also possible to insert the core into every other slit or every other slit or more. Furthermore, the conductive patterns may be formed on both sides of the insulating substrate and connected in parallel to each other. This makes it possible to double the current density. Furthermore, a coil having a multilayer structure can be obtained by laminating multiple layers of insulating substrates.

[Brief explanation of the drawing]

1 to 6 are diagrams for explaining a coil as an embodiment of the present invention, and show the manufacturing process sequentially. The figure is a plan view, and FIGS. 2 and 6 are enlarged side views of FIGS. 1 and 5, respectively. Figure 7 is the first
This is a plan view showing a state in which the coil described with reference to FIGS. 6 through 6 is formed into a chip. FIG. 8 is a plan view showing an example in which a coil is formed directly on a flexible printed circuit board. 9 and 10 are diagrams for explaining examples of variable inductors, and FIG. 9 is a plan view,
FIG. 10 is an enlarged side view of FIG. 9. 11 to 15 are diagrams for explaining examples of transformers, and FIGS. 11 and 12 show elements constituting the primary coil and secondary coil sides of the transformer, respectively, FIGS. 13 to 15 are a plan view, a side view, and a front view of the obtained transformer, respectively. 16 to 18 are diagrams for explaining other examples of the transformer, in which FIG. 16 is a plan view showing the state before the core is inserted, and FIGS. 17 and 18 are diagrams, respectively. FIG. 2 is a plan view and a front view of the obtained transformer. 1st
9 to 22 are diagrams for explaining the inducting tape conductive bar, and FIG. 19 is a v! It is a top view of the J-edge edge plate substrate 25,
The figure is a plan view showing the core 27 inserted and the extraction terminal 28 attached, FIG. 21 is a plan view showing the appearance of the finished product, and FIG. 22 is a plan view showing the electrical connection of the power supply bar in FIG. It is an equivalent circuit diagram. FIG. 23 is an electrical equivalent circuit diagram showing a modification of the power supply bar explained with reference to FIGS. 19 to 22. In the figure, #iT, 1.1a, jb, 25 are #! I
Ii-based substrate, 3, 24 are conductive patterns, 4.15, 15
a. 26 is a slit, 5.13.16.17.20°21.
27 is a core, 11 is a flexible printed circuit board,
12 is a hollow duct. Patent applicant Murata Manufacturing Co., Ltd. Figure 13 Figure 14 Centroid lZ diagram

Claims (1)

[Scope of Claims] An insulating substrate that is flexible in at least one stage of the manufacturing process; a zigzag-shaped conductive pattern formed on at least one surface of the insulating substrate; and the zigzag-shaped conductive pattern. A plurality of slits are formed by penetrating the insulating substrate in a region between the slits, and a region in which the conductive pattern extends between the plurality of slits is alternately located above and below the respective slits. The inductive parts are sequentially inserted into Surins 1 to J7.