JP2006228806A - Inductor and circuit apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inductor and a circuit apparatus strong against a shock, such as falling, etc. <P>SOLUTION: Supposing that a substrate 5 falls in the direction of an arrow A and a perpendicular shock is added to the substrate 5, the force of this shock is transmitted from the substrate 5 to the magnetic substance core 2 through each lead 4. At this time, if it bends so that each lead 4 may draw some approximate spirals, an inductor 1 receives the force of the direction of rotation through each lead 4 describing some approximate spirals, and the force of the shock turns into the torque of the inductor 1, and is distributed. Therefore, the force of the shock does not need to concentrate on the root of each lead 4, and it is hard to damage the inductor 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an inductor having leads and a circuit device on which the inductor is mounted.

  As this type of circuit device, for example, there is one using an LC resonance circuit in order to increase the circuit impedance viewed from the input side or output side of the circuit.

  For example, as shown in FIG. 8, an LC resonance circuit 103 in which an inductor 101 and a capacitor 102 are connected in parallel is inserted between an input terminal 104 and a low impedance circuit 105, and the resonance frequency of the LC resonance circuit 103 is input from the input terminal 104. Match the frequency of the pulse signal. When a pulse signal is input from the input terminal 104, the LC resonance circuit 103 resonates and exhibits high impedance, and the impedance viewed from the input terminal 104 increases. Thereby, it can be considered that the input terminal 104 is separated from the circuit impedance of the low impedance circuit 105 and the input terminal 104 is connected only to the high impedance circuit 106.

  As the inductor 101 of such an LC resonance circuit 103, various types can be applied, for example, those described in Patent Documents 1 and 2 can be applied. In the inductor of Patent Document 1, a plurality of leads are fixed vertically to an end face of a drum-type magnetic core, the wire core is attached to the base, and the coil wire wound around the magnetic core is wound. Are connected to each lead of the magnetic core. The inductor disclosed in Patent Document 2 is based on a coil wire wound around a magnetic core with a plurality of leads fixed to the base vertically and a drum-type magnetic core attached to the base. It is connected to each lead of the stand.

By the way, when the consumption current of the LC resonance circuit 103 is large (for example, about 500 mA or more), it is necessary to increase the direct current that can flow through the inductor 101. For this purpose, it is necessary to make the coil wire thicker or make the magnetic core larger, and the inductor 101 itself becomes larger and heavier.
Japanese Utility Model Publication No. 3-124613 Japanese Utility Model Publication No. 4-25209

  However, an inductor formed by winding a coil around a magnetic core is vulnerable to impacts such as dropping. In particular, the larger and heavier the inductor, the greater the impact of the inductor when it falls and the more likely it is to break.

  For this reason, it is conceivable to protect the entire inductor in a case so that no direct impact is applied to the inductor, but in this case, the inductor becomes larger and the number of parts increases, leading to an increase in cost. .

  Accordingly, the present invention has been made in view of the above-described conventional problems, and an object thereof is to provide an inductor and a circuit device that are resistant to impacts such as dropping.

  In order to solve the above-described problems, the present invention provides an inductor in which a lead is fixed to an inductor body, and an inductor formed by winding a wire is connected to the lead wire. Projecting from the inductor body.

  In addition, the present invention has a plurality of leads, and each lead protrudes so as to draw a part of a substantially spiral around the same axis.

  On the other hand, according to another aspect of the present invention, in a circuit device including a substrate on which the inductor according to the present invention is mounted, an elastic body is interposed between the inductor body of the inductor and the substrate.

  For example, the elastic body is a double-sided tape having elasticity or a paint having elasticity.

  According to another aspect of the present invention, in a circuit device including a substrate on which an inductor is mounted, a cavity is provided on a back surface side of the substrate portion on which the inductor is mounted.

  Furthermore, in such a circuit device of the present invention, the board is a double-sided board on which components can be mounted on both sides of the board, and has respective chassis that covers both sides of the double-sided board.

  According to the inductor of the present invention, the lead protrudes from the inductor body so as to draw a part of a substantially spiral. The part of the substantially spiral may be a part of a smooth arc line that approximates a spiral, or may be a part of a polygonal bent line that approximates a spiral.

  Here, it is assumed that the substrate on which the inductor is mounted falls and an impact perpendicular to the substrate is applied. At this time, the impact force is transmitted from the substrate to the inductor through the lead of the inductor, and the inductor is easily damaged at the root of the lead having low mechanical strength. However, if the lead is bent so as to draw a part of a spiral, the inductor receives a rotational force through the lead that draws a part of the spiral, and the impact force becomes the rotational force of the inductor. Distributed. For this reason, it is not necessary to concentrate the impact force on the root of the lead, and the inductor is not easily damaged.

  On the other hand, when the lead is attached perpendicularly to the inductor body as in the conventional case, when an impact perpendicular to the substrate is applied, the impact force is applied from the substrate to the inductor via the inductor lead. The lead is transmitted vertically and the lead is sandwiched between the substrate and the inductor body, so that the impact force is concentrated on the lead and the inductor is damaged at the base of the lead.

  Also, since a plurality of leads are provided and each lead protrudes so as to draw a part of a spiral around the same axis, when the substrate on which the inductor is mounted falls, the inductor A force in one rotation direction is received through all the leads to be drawn, and the impact force is more reliably dispersed as the rotation force of the inductor.

  On the other hand, according to another circuit device of the present invention, an elastic body is interposed between the inductor body of the inductor of the present invention and the substrate. For example, a double-sided tape having elasticity or a paint having elasticity is used as the elastic body. This elastic body absorbs the impact force transmitted from the substrate to the inductor when the substrate on which the inductor is mounted falls, so that the inductor is more difficult to break.

  According to another circuit device of the present invention, the cavity is provided on the back side of the substrate portion on which the inductor is mounted. For this reason, when this circuit device falls and an impact perpendicular to the substrate on which the inductor is mounted is applied, the substrate portion bends toward the cavity and absorbs the impact force, and the impact force is transmitted to the inductor. Relaxed before.

  Furthermore, in such a circuit device of the present invention, since the respective chassis for covering both sides of the double-sided board are provided, each chassis can be removed and both sides of the double-sided board can be repaired.

  The inductor of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a perspective view showing an inductor according to an embodiment of the present invention as viewed from the bottom side. 2A and 2B are a side view and a bottom view showing the inductor of this embodiment. FIG. 2A shows a part of the substrate on which the inductor of this embodiment is mounted.

  In the inductor 1 of this embodiment, a pair of leads 4 are fixed to an end surface 2a of a drum-type magnetic core 2, and a coil 3 is formed by winding a wire around the magnetic core 2. Both ends of the wire 3a are tangled to the base of each lead 4 and soldered.

  Each lead 4 is fixed by, for example, inserting one end thereof into each small hole formed in the end surface 2a of the magnetic core 2 and bonding the one end with an adhesive. These leads 4 protrude from the end surface 2 a of the magnetic core 2 so as to draw a part of a spiral around the central axis of the magnetic core 2.

  A pair of holes 5 a is formed in the substrate 5 in advance, and the diameter of each hole 5 a is sufficiently larger than the outer diameter of each lead 4 of the inductor 1, or the shape of each hole 5 a is each lead 4. It is formed in an arc shape close to the shape of For this reason, each lead 4 of the inductor 1 can be easily inserted into each hole 5 a of the substrate 5.

  Then, only the tip of each lead 4 is soldered to the wiring pattern on the back surface of the substrate 5, and the inductor 1 is mounted on the substrate 5. In this state, only the tips of the leads 4 of the inductor 1 are soldered to the substrate 5 and fixed, and the other portions of the leads 4 are floating.

  Here, if the substrate 5 falls in the direction of the arrow A and an impact perpendicular to the substrate 5 is applied, the force of the impact is transmitted from the substrate 5 to the magnetic core 2 via each lead 4. At this time, if each lead 4 is bent so as to draw a part of a spiral, the inductor 1 receives a force in the rotational direction through each lead 4 drawing a part of the spiral, and the impact force is applied to the inductor. Dispersed as a rotational force of 1. For this reason, it is not necessary to concentrate the impact force on the root of each lead 4, and the inductor 1 is hardly damaged.

  In particular, when the coil wire is thick or the magnetic core is large and the inductor is heavy, the inductor is weak against shocks such as dropping and easily damaged, and therefore the application of this embodiment is effective.

  FIGS. 3A and 3B are a side view and a bottom view showing the inductor of the comparative example. The inductor 11 of this comparative example is obtained by fixing each linear lead 13 perpendicularly to the end surface 12 a of the drum-type magnetic core 12 and is mounted on the substrate 14. When the substrate 14 falls in the direction of arrow A and a vertical impact is applied to the substrate 14, the impact force is transmitted vertically from the substrate 14 to the magnetic core 12 via the leads 13. In this state, each lead 13 is sandwiched between the magnetic core 12 and the impact force concentrates on each lead 13. For this reason, the magnetic core 12 is easily damaged at the base of each lead 13.

  Next, the circuit device of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 4 is a side view showing an embodiment of the circuit device of the present invention. In the circuit device 21 of this embodiment, the elastic body 6 is interposed between the inductor 1 and the substrate 5 of FIG. As the elastic body 6, a double-sided tape having elasticity or a paint having elasticity can be applied.

  When the elastic body 6 is interposed between the inductor 1 and the substrate 5 in this way, when the substrate 1 falls, the elastic body 6 absorbs the impact force transmitted from the substrate 5 to the inductor 1. Is more difficult to break.

  FIG. 5 is a side view showing another embodiment of the circuit device of the present invention. In the circuit device 22 of this embodiment, each lead 24 of the inductor 23 is inserted into each hole 25 a of the substrate 25, and the tip of each lead 24 is soldered to the wiring pattern on the back surface of the substrate 25. Then, the board 25 is placed on the first chassis 26, the board 25 is screwed to the first chassis 26 with each screw 27, and the second chassis 28 is overlapped and fixed to the first chassis 26. Thus, the electronic components such as the inductor 23 on the substrate 25 are covered.

  A concave portion 26a of the first chassis 26 is located on the back surface side of the substrate 25 portion on which the inductor 23 is mounted, and the back surface side of the substrate 25 portion is hollow, so that the substrate 25 portion can be bent and deformed. Yes. For this reason, when the circuit device 22 falls in the direction of arrow A and an impact is applied to the substrate 25, the portion of the substrate 25 on which the inductor 23 is mounted bends toward the concave portion 26a side of the first chassis 26 and absorbs the impact force. The impact force is alleviated before being transmitted to the inductor 23. Thereby, damage to the inductor 23 is prevented.

  FIG. 6 is a side view showing a circuit device of a comparative example. Also in the circuit device 31 of this comparative example, the inductor 32 is mounted on the substrate 33, the substrate 33 is mounted on the first chassis 34, the substrate 33 is screwed to the first chassis 34 with each screw 35, and further the first chassis 34, the second chassis 35 is overlapped and fixed, and the second chassis covers electronic components such as the inductor 23 on the substrate 33. However, there is no cavity on the back side of the substrate 33 portion on which the inductor 32 is mounted. For this reason, even if the circuit device 31 falls in the direction of arrow A and an impact is applied to the substrate 33, the substrate 33 is not bent, and most of the impact force is directly transmitted to the inductor 32 on the substrate 33. Therefore, the inductor 32 is easily damaged.

  FIG. 7 is a side view showing another embodiment of the circuit device of the present invention. In the circuit device 41 of the present embodiment, the inductor 42 is mounted on the double-sided board 43, this double-sided board 43 is placed on the first chassis 44, and the double-sided board 43 is screwed to the first chassis 44 with each screw 45, The second and third chassis 46, 47 are overlapped and fixed on the front and back of the first chassis 44, the electronic components such as the inductor 42 on the surface of the double-sided board 43 are covered by the second chassis 46, and the double-sided board is covered by the third chassis 47. 43 covers the electronic components on the back.

  An internal space of the second chassis 46 and an internal space of the third chassis 47 exist on the front surface side and the back surface side of the double-sided substrate 43 portion on which the inductor 42 is mounted. For this reason, when the circuit device 41 falls in the direction of arrow A and an impact is applied to the double-sided board 43, the double-sided board 43 part on which the inductor 42 is mounted bends up and down to absorb the impact force. The force is relaxed before being transmitted to the inductor 42. Thereby, the damage of the inductor 42 is prevented.

  In addition, since the chassis of the circuit device 41 has a three-layer structure including the first to third chassis 44, 46, and 47, the electronic part on the surface of the double-sided substrate 43 can be repaired by removing the second chassis 46. If the third chassis 47 is removed, the electronic part on the back surface of the double-sided substrate 43 can be repaired.

  In addition, this invention is not limited to said each embodiment, It can deform | transform variously. For example, each lead of the inductor is illustrated as protruding so as to draw a part of a smooth arc line approximating a helix, but instead, a part of a polygonal bent line approximating a helix is used. It may be protruding like drawing.

  Further, the inductor is exemplified as one in which each lead is fixed to the magnetic core, but a base on which the magnetic core is mounted may be provided, and each lead may be fixed to the base. Alternatively, a wire may be wound around the bobbin to form a coil, a magnetic material may be disposed at the center or around the bobbin, and each lead may be fixed to the bobbin.

  Further, in the circuit devices 22 and 42 of FIGS. 5 and 7, the inductor 1 and the substrate 5 of FIG. 1 may be applied instead of the inductors 23 and 42 and the substrates 25 and 43. In this case, damage to the inductor can be prevented more effectively.

It is a perspective view which shows one Embodiment of the inductor of this invention seeing from the bottom face side. (A) And (b) is the side view and bottom view which show the inductor of FIG. (A) And (b) is the side view and bottom view which show the inductor of a comparative example. It is a side view which shows one Embodiment of the circuit apparatus of this invention. It is a side view which shows other embodiment of the circuit apparatus of this invention. It is a side view which shows the circuit apparatus of a comparative example. It is a side view which shows another embodiment of the circuit apparatus of this invention. It is a circuit diagram which shows LC resonance circuit.

Explanation of symbols

1, 23, 42 Inductor 2 Magnetic core 3 Coils 4, 24 Leads 5, 25, Board 6 Elastic bodies 21, 22, 41 Circuit devices 26, 44 First chassis 27, 45 Screws 28, 46 Second chassis 43 Double-sided board 47 Third chassis

Claims (6)

In an inductor in which a lead is fixed to an inductor body and a coil formed by winding a wire is connected to the lead wire,
The inductor, wherein the lead protrudes from the inductor body so as to draw a part of a spiral.   2. The inductor according to claim 1, wherein the inductor has a plurality of leads, and each lead protrudes so as to draw a part of a substantially spiral around the same axis. In a circuit device comprising a substrate on which the inductor according to claim 1 is mounted,
A circuit device, wherein an elastic body is interposed between an inductor body of the inductor and the substrate.   The circuit device according to claim 3, wherein the elastic body is a double-sided tape having elasticity or a paint having elasticity. In a circuit device comprising a substrate on which an inductor is mounted,
A circuit device, wherein a cavity is provided on a back surface side of a substrate portion on which the inductor is mounted.   6. The circuit device according to claim 3, wherein the board is a double-sided board on which components can be mounted on both sides of the board, and each chassis covers both sides of the double-sided board.

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