阅读说明：本技术 绕线型电感部件 (Wound inductor component ) 是由 野矢淳 牧内浩平 奥田浩二 于 2020-01-21 设计创作，主要内容包括：本发明的课题在于,提供一种在被要求高可靠性的条件下为适当的绕线型电感部件。绕线型电感部件(10)具备：芯部(20),其具有沿轴向延伸的柱状的轴部(21)和分别设置于轴部(21)的轴向的第1端、第2端的第1支承部(22a)、第2支承部(22b)；第1端子电极(50a)、第2端子电极(50b),它们分别设置于第1支承部22a的底面(45)、第2支承部(22b)的底面(45)；线材(60),其卷绕于轴部(21),且第1端部、第2端部分别连接于第1端子电极(50a)、第2端子电极(50b)；以及外罩部件(70),其至少覆盖轴部21的上表面处的线材(60),端子压入深度为0.85[μm]以上,顶面的单位面积的粘合力为3.28[gf/mm<Sup>2</Sup>]以下。(The invention provides a wound inductor component which is suitable under the condition that high reliability is required. A wound-type inductance component (10) is provided with: a core part (20) having a columnar shaft part (21) extending in the axial direction and a 1 st support part (22a) and a 2 nd support part (22b) provided at the 1 st end and the 2 nd end of the shaft part (21) in the axial direction, respectively; a 1 st terminal electrode (50a) and a 2 nd terminal electrode (50b) which are respectively arranged on the bottom surface (45) of the 1 st supporting part 22a and the bottom surface (45) of the 2 nd supporting part (22 b); a wire (60) wound around the shaft (21) and having a 1 st end and a 2 nd end connected to the 1 st terminal electrode (50a) and the 2 nd terminal electrode, respectivelyA pole (50 b); and a cover member (70) that covers at least the wire (60) on the upper surface of the shaft portion (21), and has a terminal press-fitting depth of 0.85[ mu ] m]The adhesive force per unit area of the top surface was 3.28gf/mm 2 ]The following.)

1. A wound-type inductance component, comprising:

a core portion having a columnar shaft portion extending in an axial direction and a 1 st support portion and a 2 nd support portion provided at a 1 st end and a 2 nd end of the shaft portion in the axial direction, respectively;

a 1 st terminal electrode and a 2 nd terminal electrode which are respectively arranged on the bottom surface of the 1 st supporting part and the bottom surface of the 2 nd supporting part;

a wire rod wound around the shaft portion, the 1 st end portion and the 2 nd end portion being connected to the 1 st terminal electrode and the 2 nd terminal electrode, respectively; and

a cover member for covering at least the wire on the upper surface of the shaft portion, wherein the terminal press-in depth is 0.85 μm or more, and the adhesive force per unit area of the top surface is 3.28gf/mm²The following.

2. The wound inductive component of claim 1,

the terminal press-fitting depth of the cover member is 0.85[ mu ] m or more after 1000 cycles of a thermal shock test at-55 to 125 ℃.

3. The wound inductive component of claim 2,

the terminal press-fitting depth of the cover member is 0.85[ mu ] m or more after 1500 cycles of a thermal shock test at-55 to 125 ℃.

4. The wound inductive component of claim 3,

the terminal press-fitting depth of the cover member is 0.85[ mu ] m or more after 2000 cycles of a thermal shock test at-55 to 125 ℃.

5. A wound-type inductance component according to any one of claims 1 to 4,

the cover member has a thickness, which is represented by a distance between an uppermost portion of the wire on the upper surface of the shaft portion and a top surface of the cover member, of 27 to 109[ mu ] m inclusive.

6. The wound inductive component of claim 5,

the thickness of the cover member is 30 μm to 107 μm.

7. A wound-type inductance component according to any one of claims 1 to 6,

the cover member covers the wire at a side surface of the shaft portion, and a thickness of the cover member, which is represented by a distance between an outermost portion of the wire at the side surface of the shaft portion and the side surface of the cover member, is 19 μm or less.

8. A wound-type inductance component according to any one of claims 1 to 7,

the cover member covers the wire on the lower surface of the shaft portion, and the thickness of the cover member, which is represented by the distance between the lowermost portion of the wire on the lower surface of the shaft portion and the lower surface of the cover member, is 107[ mu ] m or more and 199[ mu ] m or less.

9. A wound-type inductance component according to any one of claims 1 to 8,

the width dimension of the core in the short side direction in the product plane is 0.60mm to 1.09 mm.

10. A wound-type inductance component according to any one of claims 1 to 8,

the core has a length dimension in the longitudinal direction in the product plane of 1.40mm to 1.75 mm.

11. A wound-type inductance component according to any one of claims 1 to 10,

only 1 of the wires was wound around the core.

12. A wound-type inductance component according to any one of claims 1 to 11,

the 1 st terminal electrode covers the entire bottom surface of the 1 st support portion,

the 2 nd terminal electrode covers the entire bottom surface of the 2 nd support portion.

13. A wound-type inductance component according to any one of claims 1 to 10,

only 2 of the wires were wound to the core.

14. A wound-type inductance component according to any one of claims 1 to 10,

only 3 of the wires were wound to the core.

15. A wound-type inductance component according to any one of claims 1 to 14,

the top surface of the housing member is a flat surface.

16. A wound-type inductive component according to any one of claims 1 to 15,

the cover member covers the wire at a side surface of the shaft portion, and the side surface of the cover member covering the side surface is a flat surface.

Technical Field

The present invention relates to a wound inductor component.

Background

Conventionally, various inductance components are mounted on electronic devices. A wound inductor component is provided with: the wire harness includes a core, a wire wound around the core, and a cover member covering the wire at an upper surface of the core. The top surface of the cover member is a surface to be sucked by a suction nozzle of an automatic mounter when the wire-wound inductance member is mounted on the circuit board (see, for example, patent document 1).

Patent document 1: japanese patent laid-open publication No. 2004-349391

However, the cover member is generally made of a resin such as an epoxy resin in view of cost and handling of the winding type inductance member in the manufacturing process. However, most of conventional wound-type inductance components are designed for consumer equipment in general, and particularly, a housing component made of resin is used under conditions where high reliability is required for in-vehicle equipment or the like.

Disclosure of Invention

An object of the present disclosure is to provide a wound inductor component that is suitable under conditions where high reliability is required.

A wound inductor component according to an aspect of the present disclosure includes: a core portion having a columnar shaft portion extending in an axial direction and a 1 st support portion and a 2 nd support portion provided at a 1 st end and a 2 nd end of the shaft portion in the axial direction, respectively; a 1 st terminal electrode and a 2 nd terminal electrode which are respectively arranged on the bottom surface of the 1 st supporting part and the bottom surface of the 2 nd supporting part; a wire rod wound around the shaft portion, the 1 st end portion and the 2 nd end portion being connected to the 1 st terminal electrode and the 2 nd terminal electrode, respectively; and a cover member covering at least the wire material on the upper surface of the shaft portion, wherein the terminal press-fitting depth is 0.85[ mu ] m]The adhesive force per unit area of the top surface was 3.28gf/mm²]The following.

According to this configuration, it is possible to suppress the occurrence of cracks in the cover member and to ensure workability in the manufacturing process and the mounting process.

According to one embodiment of the present disclosure, a wound inductor component suitable under conditions where high reliability is required can be provided.

Drawings

Fig. 1 (a) is a front view showing a winding type inductance component according to an embodiment, and fig. 1 (b) is an end view of the winding type inductance component.

Fig. 2 is a sectional view taken along line a-a of fig. 1 (a).

Fig. 3 is a perspective view of a wound inductor component according to an embodiment.

Fig. 4 is an explanatory view of the indentation depth measurement test.

FIG. 5 is an explanatory view of an adhesion force measurement test.

FIG. 6 is an explanatory view showing a measuring method in the adhesion force measuring test.

Fig. 7 (a) is a perspective view showing a modified example of the winding type inductance component, and fig. 7 (b) is a cross-sectional view of the winding type inductance component.

Fig. 8 (a) is a perspective view showing a modified example of the winding type inductance component, and fig. 8 (b) is a cross-sectional view of the winding type inductance component.

Fig. 9 (a) is a perspective view showing a modified example of the winding type inductance component, and fig. 9 (b) is a cross-sectional view of the winding type inductance component.

Fig. 10 is a bottom view of a winding type inductance component showing a modification.

Description of reference numerals

10. 10a, 10b, 10c … wound-type inductance components; 21 … a shaft portion; 22a … support part 1; 22b … support No. 2; 20 … a core; 50a … 1 st terminal electrode; 50b … terminal electrode No. 2; 60 … wire; 70. 70a, 70b, 70c … cover member; du, Ds, Dd ….

Detailed Description

One embodiment will be described below.

In addition, the drawings may show the components in an enlarged scale for easy understanding. The size ratio of the constituent elements may be different from the actual size ratio or the size ratio in other drawings. Note that, although hatching is given in the cross-sectional view, hatching of some of the components may be omitted to facilitate understanding.

The wound-type inductance component 10 shown in fig. 1 (a), 1 (b), 2, and 3 is a surface-mount component mounted on a circuit board or the like, for example. The wound inductor member 10 is used in, for example, an electronic circuit of a device such as a communication device mounted on a vehicle (in-vehicle device), but is not limited to this, and can be used in various devices such as general consumer equipment, industrial equipment, and medical equipment.

The wound inductor member 10 includes: a core portion 20 having a columnar shaft portion 21 extending in an axial direction and a 1 st support portion 22a and a 2 nd support portion 22b provided at a 1 st end and a 2 nd end of the shaft portion 21 in the axial direction, respectively; a 1 st terminal electrode 50a and a 2 nd terminal electrode 50b provided on the bottom surface 45 of the 1 st supporting part 22a and the bottom surface 45 of the 2 nd supporting part 22b, respectively; a wire 60 wound around the shaft 21 and having a 1 st end and a 2 nd end connected to the 1 st terminal electrode 50a and the 2 nd terminal electrode 50b, respectively; and a cover member 70 that covers at least the wire 60 at the upper surface of the shaft portion 21.

The shaft portion 21 is formed in a quadrangular prism shape extending in the longitudinal direction Ld as the axial direction. The shaft portion 21 has an upper surface 31 and a lower surface 32 on both sides in the height direction Td, and a pair of side surfaces 33 on both sides in the width direction Wd. Further, the height direction Td and the width direction Wd are directions perpendicular to the length direction Ld, the height direction Td is a direction perpendicular to the top surface 73 of the cover member 70, and the width direction Wd is a direction parallel to the top surface 73 of the cover member 70. In the height direction Td, the cover member 70 is positioned upward, and the 1 st and 2 nd terminal electrodes 50a and 50b are positioned downward.

The 1 st and 2 nd support portions 22a and 22b are each formed in a rectangular parallelepiped flange shape having a rectangular main surface extending in the height direction Td and the width direction Wd from the 1 st and 2 nd ends of the shaft portion 21. The 1 st and 2 nd support portions 22a and 22b support the shaft portion 21 so that the longitudinal direction Ld is parallel to the circuit board to be mounted. The 1 st and 2 nd support portions 22a and 22b are formed integrally with the shaft portion 21. The shaft portion 21, the 1 st support portion 22a, and the 2 nd support portion 22b are preferably formed into curved surfaces or flat surfaces at corner portions and ridge line portions by barrel polishing, chamfering, or the like.

As shown in fig. 1a and 1 b, the 1 st and 2 nd support portions 22a and 22b have an inner surface 41 facing the shaft portion 21 side (inner side), an outer end surface 42 facing the side opposite to the inner surface 41, a pair of side surfaces 43 on both sides in the width direction Wd, a top surface 44 on the upper side in the height direction Td, and a bottom surface 45 on the lower side in the height direction Td. The inner surface 41 of the 1 st support portion 22a faces the inner surface 41 of the 2 nd support portion 22 b. The bottom surface 45 is a surface facing a circuit board to which the winding type inductance component 10 is mounted. The inner surface 41 and the end surface 42 are perpendicular to the length direction Ld, the side surface 43 is perpendicular to the width direction Wd, and the top surface 44 and the bottom surface 45 are perpendicular to the height direction Td. The plane defined by the "longitudinal direction Ld" and the "width direction Wd" is a product plane.

In the core portion 20 of the wire-wound inductance component 10 of the present embodiment, for example, the length (length L1) along the longitudinal direction Ld from the end surface 42 of the 1 st support portion 22a to the end surface 42 of the 2 nd support portion 22b is 1.6[ mm ], the length (height T1) along the height Td from the bottom surface 45 to the top surface 44 of the 1 st support portion 22a and the 2 nd support portion 22b is 0.85[ mm ], and the length (width W1) along the width Wd between the pair of side surfaces 43 of the 1 st support portion 22a and the 2 nd support portion 22b is 0.8[ mm ]. The length L1, height T1, and width W1 of the core 20 are not limited to these, and the length L1 of the core 20 may be, for example, 1.40[ mm ] or more and 1.75[ mm ] or less. This reduces the possibility of contact with another member adjacent to the member in the longitudinal direction Ld. The core 20 may have a height dimension T1 and a width dimension W1 of 0.6[ mm ] to 1.09[ mm ], for example. Thereby, the possibility of contact with other components adjacent in the height direction Td and the width direction Wd can be reduced. For example, the height T1 and the width W1 of the core 20 may be equal.

As the material of the core portion 20, a magnetic material (e.g., nickel (Ni) -zinc (Zn) ferrite, manganese (Mn) -Zn ferrite), alumina, a metallic magnetic body, or the like can be used. The core 20 is obtained by compression molding and sintering powders of these materials. The core portion 20 may be a molded article made of a resin containing magnetic powder.

The 1 st and 2 nd terminal electrodes 50a and 50b are provided on the 1 st and 2 nd support portions 22a and 22b, respectively. In the 1 st supporting part 22a and the 2 nd supporting part 22b, the 1 st terminal electrode 50a and the 2 nd terminal electrode 50b cover the entire surface of the bottom surface 45, the inner surface 41, the end surface 42, and an end portion of the pair of side surfaces 43 on the bottom surface 45 side, respectively. The 1 st and 2 nd terminal electrodes 50a and 50b may be formed by, for example, firing a conductive paste containing silver as a conductive component in glass powder, and may be plated with Ni, Cu, Sn, or the like on the surface thereof as necessary.

The wire 60 is spirally wound around the shaft 21. The wire 60 is directly wound around the shaft portion 21, and forms a single layer of, for example, 1 turn of wire with respect to the shaft portion 21. The wire 60 is not limited to a single layer, and may be wound around the shaft 21 to form 2 layers or 3 layers, thereby forming a plurality of layers. Further, the plurality of wires 60 may be wound around the shaft portion 21. The wire 60 includes, for example, a core wire having a circular-shaped cross section and a covering material covering the surface of the core wire. The core wire may be made of a conductive metal material such as Cu or Ag as a main component. As a material of the covering material, for example, an insulating resin material such as polyurethane, polyester, polyimide, polyamide, or a mixture thereof can be used.

The 1 st end and the 2 nd end of the wire 60 are electrically connected to the 1 st terminal electrode 50a and the 2 nd terminal electrode 50b, respectively. The connection between the wire 60 and the 1 st and 2 nd terminal electrodes 50a and 50b can be performed by, for example, thermocompression bonding. For example, the wire 60 is thermally pressed on the plating layer of tin (Sn) or the like of the 1 st and 2 nd terminal electrodes 50a and 50b, whereby the core wire of the wire 60 can be electrically connected to the 1 st and 2 nd terminal electrodes 50a and 50 b. The method of connecting the wire 60 to the 1 st and 2 nd terminal electrodes 50a and 50b is not limited to this, and various known methods such as soldering and welding can be used.

The cross-sectional diameter of the core wire of the wire 60 is preferably in the range of, for example, 14[ mu ] m to 20[ mu ] m, and more preferably in the range of 15[ mu ] m to 17[ mu ] m. In the present embodiment, the diameter of the wire 60 is about 16[ μm ]. The larger the diameter of the wire 60, the more the increase of the resistance component can be suppressed, and the smaller the diameter of the wire 60, the more the number of turns of the wire 60 wound around the shaft portion 21 can be increased, and the protrusion of the wire 60 from the outer shape of the core portion 20 can be suppressed.

The cover member 70 is formed to cover the wire 60 at the upper surface 31 of the shaft portion 21. In the present embodiment, the cover member 70 is formed to cover the upper surface 31 of the shaft portion 21 and the top surfaces 44 of the 1 st and 2 nd support portions 22a and 22 b. The cover member 70 has a pair of end surfaces 71 on both sides in the longitudinal direction Ld, a pair of side surfaces 72 on both sides in the width direction Wd, and a top surface 73 oriented in the same direction as the top surfaces 44 of the 1 st and 2 nd support portions 22a and 22b in the height direction Td. The top surface 73 of the cover member 70 is a flat surface. The pair of end faces 71 and the pair of side faces 72 of the cover member 70 may be flat faces or may not be flat faces. In the present specification, the flat surface means a surface having a surface roughness Ra of 50[ mu ] m or less. The cover member 70 can reliably perform suction by a suction nozzle of an automatic loader when the wire-wound inductance component 10 is mounted on a circuit board, for example, and the top surface 73 is a surface to be sucked by the automatic loader. The cover member 70 functions as a protective member for preventing the wire 60 from being damaged in the manufacturing process, the mounting process, and the use environment, such as when suction is performed by the suction nozzle.

As shown in fig. 2, the thickness Du of the cover member 70 is represented by the distance between the uppermost portion of the wire 60 on the upper surface 31 of the shaft portion 21 and the top surface 73 of the cover member 70. The thickness Du of the cover member 70 is preferably 27[ mu ] m to 109[ mu ] m, more preferably 30[ mu ] m to 107[ mu ] m.

The housing member 70 has a terminal press-in depth of 0.85[ mu ] m]Above, the adhesive force is 3.28[ gf/mm²]The following components. As a material of the cover member, for example, acrylic, urethane, silicon, or other resins can be used, and in the present embodiment, an acrylic resin is used for the cover member 70. The resin used for the cover member 70 preferably has a softening point of 45℃ as measured by TMA method]The resin below, more preferably 40 [. degree.C]The following resins. An example of the softening point of the cover member 70 is, for example, 36 DEG C]. MakingAs a curing method of the cover member 70, various known methods such as UV curing and thermal curing can be used.

The cover member 70 may contain a magnetic material such as a metal magnetic powder or ferrite powder, thereby increasing the inductance (L value) of the wire-wound inductor member 10. On the other hand, the cover member 70 may not contain a magnetic material but may be a non-magnetic material, thereby reducing magnetic loss and improving the Q value of the wound inductor member 10. The cover member 70 may be a mixture of a plurality of resins, or may contain a filler of a non-magnetic material such as silica or barium sulfate, whereby the thermal expansion coefficient can be adjusted.

The cover member 70 preferably maintains the terminal press-fitting depth of 0.85[ μm ] or more even after thermal shock. As the thermal shock, for example, a test method in which the winding type inductance component 10 is left in a temperature environment of-55 ℃ for 30 minutes and then left in a temperature environment of 125 ℃ for 30 minutes for 1 cycle and the cycle is repeated can be used. In the specification and drawings of the present application, the term "thermal shock test at" -55 to 125 ℃ refers to the above-described test method.

More specifically, the cover member 70 preferably has a terminal press-in depth of 0.85[ μm ] or more even after 1000 cycles of the thermal shock test at-55 to 125 ℃, more preferably 0.85[ μm ] or more even after 1500 cycles of the thermal shock test, and most preferably 0.85[ μm ] or more even after 2000 cycles of the thermal shock test.

As described later, the terminal press-fitting depth of the cover member 70 is 0.85[ μm ] or more, whereby the cover member 70 can be suppressed from cracking due to a thermal shock test. In other words, in the above case, the state in which the breakage of the cover member 70 is suppressed can be maintained even in the thermal shock test which is further added after each cycle.

The terminal press-fitting depth was measured as follows.

The test device comprises: ENT-2100 (Elionix, Ltd.), Bokkovich indenter (65.03[ ° C.)]，As(h)＝26.43[h²])

The measurement conditions were as follows: the initial pressure head load is 0[ mgf ], the final pressure head load is 350[ mgf ], the division number is 500[ step ], the step interval is 20[ msec ], the temperature is 30[ deg.C ]

Fig. 4 shows an outline of the measurement of the terminal press-fitting depth. In the measurement of the terminal press-fitting depth, the wire-wound inductance member 10 was placed on the test stand 101 made of SUS substrate, and the indenter 102 of the test apparatus was pressed against the center of the top surface 73 of the cover member 70 of the wire-wound inductance member 10 placed thereon using the above-described test apparatus. Then, the depth of the recess (the pushing amount of the indenter 102) when the indenter load is 350[ mgf ] is measured under the above measurement conditions, and is used as a reference depth of the recess formed in the cover member 70 by the indenter 102.

The adhesive force of the cover member 70 was measured as follows.

The test device comprises: TAC-1000(RHESCA Co., LTD. manufactured adhesion Tester (Tackiness Tester))

The determination method comprises the following steps: probe test quick stick (probe tack) method

The measurement conditions were as follows: probe and table temperature 20-30 [ deg. ] C, probe diameter 5[ mm ], test table material SUS430, operation mode 5, pressing speed 0.5[ mm/sec ], pressing load 1000[ gf ], pressing holding time 10[ sec ], lifting speed 0.1[ mm/sec ], final lifting distance 1[ mm ]

Fig. 5 shows an outline of measurement of the adhesive force of the cover member 70. In the measurement of the adhesive force, the top surface 73 of the cover member 70 of the wire-wound inductance member 10 was opposed to the upper surface 111a of the test stand 111 made of the SUS substrate, and the wire-wound inductance member 10 was fixed to the measurement probe 112. The measurement probe 112 has a load sensor (load cell).

Fig. 6 shows changes in the load measured by the measurement probe 112. In fig. 6, the horizontal axis represents Time (Time), and the vertical axis represents the load (load) measured by the measurement probe 112. In the state shown in fig. 5, the measurement probe 112 is moved downward, and the top surface 73 of the cover member 70 of the wound-type inductance member 10 is pressed against the upper surface 111a of the test stand 111 by the pressure described in the above-mentioned measurement conditions, and then the measurement probe 112 is moved upward. In this movement, when the cover member 70 of the wire-wound inductance component 10 is separated from the upper surface 111a of the test stand 111, the negative pressure measured by the measuring probe 112 is measured as the adhesive force.

(action)

Next, the operation of the wound inductor member 10 of the present embodiment will be described.

The wound inductor member 10 includes: a core portion 20 having a columnar shaft portion 21 extending in an axial direction (longitudinal direction Ld) and a 1 st support portion 22a and a 2 nd support portion 22b provided at a 1 st end and a 2 nd end of the shaft portion 21 in the axial direction, respectively; a 1 st terminal electrode 50a and a 2 nd terminal electrode 50b provided on the bottom surface 45 of the 1 st supporting part 22a and the bottom surface 45 of the 2 nd supporting part 22b, respectively; a wire 60 wound around the shaft 21 and having a 1 st end and a 2 nd end connected to the 1 st terminal electrode 50a and the 2 nd terminal electrode 50b, respectively; and a cover member 70 covering at least the wire 60 on the upper surface of the shaft portion 21, the terminal press-fitting depth being 0.85[ mu ] m]As described above, the adhesive force per unit area of the top surface 73 was 3.28[ gf/mm ]²]The following.

The inventors of the present application studied the use of the wound-type inductance component 10 under conditions where high reliability is required, such as for in-vehicle equipment, and carried out a thermal shock test under conditions where the temperature range is larger than that of ordinary consumer equipment, such as-55 to 125 ℃. Then, in the case of the wound-type inductance component 10, the cover member 70 made of a general epoxy resin was found to be unable to withstand the above thermal shock test, and the cover member 70 was broken.

Therefore, the inventors of the present application have conceived that the resistance of the thermal shock test is improved by further improving the flexibility of the cover member 70, and after conducting research, in the evaluation based on the above-described unique measurement method, it was found that when the terminal press-fitting depth of the cover member 70 is 0.85[ μm ] or more, the cover member 70 is not cracked in the thermal shock test.

Further, the inventors of the present application have found, through studies, that the effect of suppressing the breakage of the cover member 70 is improved as the terminal press-fitting depth is increased, but have found that another problem occurs as the terminal press-fitting depth is increased. Specifically, it was found that when the terminal press-fitting depth is increased and the cover member 70 is softened, the adhesive force of the resin is increased, and the workability of the wire-wound inductance member 10 is deteriorated. In particular, it is clear that when the plurality of winding-type inductance components 10 are brought into contact with each other in the outer cover member 70, they are adhered to each other, and the handling becomes difficult in the manufacturing process and the mounting process of the winding-type inductance components 10.

Accordingly, the inventors of the present application further conceived the evaluation based on the above-described unique measurement method, and found that the adhesive force of the cover member 70 per unit area of the top surface 73 was 3.28[ gf/mm ] by this measurement method²]As described below, the adhesion of the cover members 70 of the wound-type inductance component 10 to each other can be suppressed.

Therefore, in the wire-wound inductance component 10 of the present embodiment, the terminal press-fitting depth through the cover member 70 is 0.85[ μm ]]As described above, the adhesive force per unit area of the top surface 73 was 3.28[ gf/mm ]²]Below, even at-55 [ DEGC]～125[℃]The winding type inductance component 10 can be provided which is suitable under the conditions where high reliability is required, without causing breakage of the cover members 70, and can suppress adhesion of the cover members 70 to each other in the thermal shock test of (1).

As described above, according to the present embodiment, the following effects are obtained.

(1) The wound inductor member 10 includes: a core portion 20 having a columnar shaft portion 21 extending in an axial direction and a 1 st support portion 22a and a 2 nd support portion 22b provided at a 1 st end and a 2 nd end of the shaft portion 21 in the axial direction, respectively; a 1 st terminal electrode 50a and a 2 nd terminal electrode 50b provided on the bottom surface 45 of the 1 st supporting part 22a and the bottom surface 45 of the 2 nd supporting part 22b, respectively; a wire 60 wound around the shaft 21 and having a 1 st end and a 2 nd end connected to the 1 st terminal electrode 50a and the 2 nd terminal electrode 50b, respectively; and a cover member 70 that covers at least the wire 60 at the upper surface of the shaft portion 21.

According to the wound-type inductance component 10, it is possible to suppress the occurrence of cracks (fractures) in the cover member 70 and to ensure workability in the manufacturing process and the mounting process. Thus, the decrease in reliability of the wound inductor component 10 can be suppressed.

(2) The housing member 70 has a terminal press-fitting depth of 0.85[ mu ] m or more after a thermal shock test at-55 to 125[ deg. ] C. Thus, the wound inductor component 10 can be provided which is suitable under the condition where high reliability is required.

(3) The cover member 70 has a thickness Du of 27[ mu ] m to 109[ mu ] m, which is represented by the distance between the uppermost portion of the wire 60 on the upper surface 31 of the shaft portion 21 and the top surface 73 of the cover member 70. Therefore, the covering property of the uppermost portion of the wire 60 and the flat surface of the cover member 70 can be ensured, and the height reduction and the curability of the cover member 70 can be ensured.

In addition, the following shows results of practical production and evaluation of an example of the wound-type inductance component 10 by the inventors of the present application.

(confirmation of crack Generation)

As shown in table 1, samples 1 to 5 having different terminal press-fitting depths of the cover member 70 were prepared as examples and comparative examples of the wire-wound inductor member 10, and 2000 cycles of thermal shock tests at-55 to 125 ℃. In addition, the cover member 70 was observed by an optical microscope and an electron microscope for the samples 1 to 5 after the thermal shock test, and the presence or absence of cracking was confirmed. Further, the terminal press-fitting depth of the cover member 70 in the samples 1 to 5 was adjusted by changing the kind of resin, the composition, and the curing condition of the cover member 70.

Table 1 shows the results of checking whether or not cracking occurred after the thermal shock test in each of samples 1 to 5. In table 1, of the samples 1 to 5 after the thermal shock test, the sample in which cracking was not confirmed is "G", and the sample in which cracking was confirmed is "NG", which are shown in the column of the thermal shock test.

[ Table 1]

No.	1	2	3	4	5
						Terminal press-in depth (mum)	11.45	6.59	3.63	0.85	0.12
Thermal shock test	G	G	G	G	NG

As shown in table 1, although the fracture of the cover member 70 was confirmed after the thermal shock test for the sample 5 having the terminal press-fitting depth of 0.12[ μm ] in the cover member 70, the fracture of the cover member 70 could not be confirmed after the thermal shock test for the samples 1 to 4 having the terminal press-fitting depth of 0.85[ μm ] or more in the cover member 70.

(confirmation of adhesion force and adhesion of cover member 70) As shown in Table 2, samples 1 to 35 having different adhesion forces of cover member 70 were prepared as examples and comparative examples of the wire-wound inductance member 10, and a tree was used as the cover member 70The lipids contacted each other, and the presence or absence of adhesion was confirmed. Further, as shown in Table 2, the adhesive force [ gf ] was calculated by the above-mentioned measurement method]Thereafter, the area [ mm ] of the top surface 73 of the cover member 70 was measured²]Based on the adhesive force and area, the unit area (1[ mm ] of the top surface 73 of the cover member 70 was calculated²]) Adhesive force of (g f/mm)²]. The adhesive force of the cover member 70 in samples 1 to 35 was adjusted by changing the resin type, the composition, and the curing conditions of the cover member 70.

[ Table 2]

As shown in Table 2, the adhesive force per unit area of the top surface 73 of the cover member 70 was 3.28[ gf/mm ]²]In the following samples 1 to 30, the adhesion of the cover members 70 to each other did not occur. On the other hand, the adhesive force per unit area of the top surface 73 of the cover member 70 exceeds 3.28[ gf/mm²]The samples 31 to 35 (2) produced adhesion of the cover members 70 to each other.

(modification example)

The above embodiment can be implemented as follows.

In the winding type inductance component 10a shown in fig. 7 (a) and 7 (b), the cover member 70a does not cover the 1 st and 2 nd support portions 22a and 22b, but covers the wires 60 on the upper surface 31 and the side surfaces 33 of the shaft portion 21 only between the 1 st and 2 nd support portions 22a and 22 b. In this case, the thickness Ds represented by the distance between the outermost portion of the wire 60 on the side surface 33 of the shaft portion 21 and the surface (side surface 72) of the cover member 70a is preferably 19[ μm ] or less. This protects the wire 60 on the side surface 33 side of the shaft 21, and reduces the influence on the outside.

In the wire-wound inductance component 10b shown in fig. 8 (a) and 8 (b), the cover member 70b does not cover the 1 st and 2 nd support portions 22a and 22b, and only covers the wire 60 at the upper surface 31 of the shaft portion 21 and does not cover the wire 60 at the side surface 33 of the shaft portion 21 between the 1 st and 2 nd support portions 22a and 22 b. In the wound-type inductance component 10b, similarly to the above-described embodiment, the covering property of the uppermost portion of the wire 60 and the flatness of the cover member 70b can be secured, and the reduction in height and the curability of the cover member 70b can be secured.

In the winding type inductance component 10c shown in fig. 9 (a) and 9 (b), the cover member 70c covers the wire 60 at the upper surface 31, the side surface 33, and the lower surface 32 of the shaft portion 21 only between the 1 st supporting portion 22a and the 2 nd supporting portion 22b of the core 20. The cover member 70c partially covers a transition portion 63 between the wire winding portion 61 wound around the shaft portion 21 of the wire 60 and the connection portion 62 connected to the 1 st and 2 nd terminal electrodes 50a and 50 b. In this case, the thickness Dd represented by the distance between the lowermost portion of the wire 60 at the lower surface 32 of the shaft portion 21 and the surface (lower surface 74) of the cover member 70c is preferably 107[ μm ] to 199[ μm ]. This can protect the wire 60 on the lower surface 32 side of the shaft portion 21, and also ensure ease of coating within a range that can reduce the influence on the outer shape. In addition, disconnection of the wire 60 due to the resin coating after mounting can also be suppressed.

In the above-described wound inductance components 10a, 10b, and 10c, the cover members 70a, 70b, and 70c may be formed to cover the top surfaces 44 of the 1 st and 2 nd support portions 22a and 22 b. The cover members 70a, 70b, and 70c may be formed to cover the end surfaces 42 and the side surfaces 43 of the 1 st support portion 22a and the 2 nd support portion 22 b.

In the above embodiment, only 1 wire 60 is wound around the core 20, but the present invention is not limited to this configuration. In the winding-type inductance component 200 shown in fig. 10, a plurality of (2 in fig. 10) wire materials 221 and 222 are wound around the shaft portion 211 of the core 210. The 1 st support part 212 is provided with a 1 st terminal electrode 214 and a 2 nd terminal electrode 215, and the 2 nd support part 213 is provided with a 3 rd terminal electrode 216 and a 4 th terminal electrode 217. The 1 st end of the wire 221 is connected to the 1 st terminal electrode 214 of the 1 st supporting part 212, and the 2 nd end of the wire 221 is connected to the 3 rd terminal electrode 216 of the 2 nd supporting part 213. The 1 st end of the wire 222 is connected to the 2 nd terminal electrode 215 of the 1 st supporting part 212, and the 2 nd end of the wire 222 is connected to the 4 th terminal electrode 217 of the 2 nd supporting part 213. As shown in fig. 10, only 2 wires 221 and 222 are wound around the core 210, but only 3 wires may be wound. The wound inductor component including the plurality of wires can be applied to a plurality of applications such as a transformer, a common mode filter, and a balun. In fig. 10, the plurality of wires are connected to different terminal electrodes, respectively, but may be connected to a common terminal electrode in parallel electrically. This can reduce the direct current resistance of the wire.