JP4512420B2 - Inductor - Google Patents

Description

  The present invention relates to an inductor applied to various electronic devices.

  In recent years, inductors have been required to be smaller and thinner in order to increase the mounting density of circuit boards and meet the demand for downsizing electronic devices. One type of conventional inductor is known in which a winding is wound around a drum core, and a ring core is disposed in a state of being opposed to the drum core.

  There are mainly the following three types of such inductors. As a first type, there is one in which a terminal of a winding is led out from a gap portion between the drum core and the ring core and the terminal is joined to a terminal member attached to the outer peripheral surface of the ring core. The second type includes an inductor shown in FIG. In this type, the ring core 1 is provided with a recess 2, the terminal 3 is led out from the recess 2, and the terminal 3 is joined to a terminal member (not shown) attached to the outer peripheral surface of the ring core 1. Furthermore, as the third type, the binding terminal is protruded outward, the end of the winding is connected to the binding terminal, and soldering is made to the binding part. There is.

  Patent Document 1 discloses a configuration in which a terminal of a winding is joined by soldering to a terminal member having a flat portion mounted on a circuit board without providing a binding terminal.

JP 2003-109823 A (see paragraph number 0035, FIG. 3, FIG. 4 and FIG. 9)

  By the way, in the first type inductor described above, soldering is performed on the outer peripheral surface of the terminal member located on the outer diameter side of the ring core. Therefore, the build-up part by soldering protrudes to the outer diameter side from the outer peripheral surface of the terminal member, which hinders the reduction of the width dimension.

  Further, in the second type of inductor as shown in FIG. 6, the opening area of the recess 2 is large, and the magnetic flux leakage from the recess 2 is large. As a result, there is a problem that the magnetic field strength of the inductor is reduced. Furthermore, in the third type inductor having a binding terminal, extra dimensions are required for the binding terminal. Therefore, even in this type of inductor, it is difficult to reduce the width dimension.

  Here, from the viewpoint of miniaturization, it is preferable not to provide the binding terminal like the inductor disclosed in Patent Document 1. However, in the configuration disclosed in Patent Literature 1, the terminal is joined by soldering in a state where the terminal portion is extended to the outer peripheral wall portion of the terminal member. Therefore, it protrudes outward by the amount corresponding to the build-up part by soldering, and hinders the reduction of the width dimension.

  Further, in the inductor disclosed in Patent Document 1, the terminal member is bent in accordance with the shape of the groove. That is, in the configuration of Patent Document 1, the terminal member is provided in a state surrounding the groove portion and cannot be fitted from the outside. Therefore, there is a problem that the man-hours are increased by the amount of bending and the cost is increased. Furthermore, in the configuration disclosed in Patent Document 1, an attachment portion for fixing is provided in addition to the joint portion of the terminal member to which the end of the winding is connected. For this reason, the ring core has an extra groove portion corresponding to the mounting portion, and there is a problem that magnetic flux leakage increases by that amount and the magnetic field strength of the inductor decreases.

  The present invention has been made based on the above circumstances, and an object of the present invention is to provide an inductor capable of reducing the width dimension and reducing magnetic flux leakage. .

In order to solve the above problems, the present invention includes a first core member having a winding shaft, a winding wound around the outer peripheral surface of the winding shaft, and an inner cylinder portion surrounded by a peripheral wall. A second core member that disposes the first core member in the cylindrical portion, an outer peripheral terminal that is located on the outer peripheral surface of the second core member and that joins the end of the winding, and one end surface of the second core member anda terminal member having a planar terminal mounted on the projecting mounting region than between the outer peripheral surface and the outer peripheral terminal of the peripheral wall, with a gap portion for entering a terminal is provided, this gap portion, the outer circumferential recess formed by depressing the outer peripheral surface of the peripheral wall of the second core member is constituted by covering the outer peripheral terminal, the terminal have been joined to the outer peripheral terminals in the gap portion, the second The other end surface of the core member is provided with a lead-out recess that is recessed from the other end surface. Have, the terminal of the winding are those derived toward the outer peripheral recesses through the outlet recess.

  When configured in this way, the end of the winding is located in a gap portion that exists between the outer peripheral surface of the peripheral wall of the second core member and the outer peripheral terminal, and the end of the winding in this gap portion The outer peripheral terminal is joined. Thus, since the junction part of a terminal and an outer periphery terminal exists in a clearance gap, the buildup part accompanying this junction also exists in this clearance gap. Thereby, it can prevent that a buildup part protrudes toward the outer peripheral surface side of an outer periphery terminal. For this reason, compared with the structure in which the terminal is joined on the outer peripheral surface side of the outer peripheral terminal, since the built-up portion does not exist on the outer peripheral surface, the width dimension of the inductor can be reduced. In addition, compared with a configuration in which the end of the winding is entangled with a binding terminal protruding to the outer diameter side, the binding terminal does not exist, and therefore the width dimension of the inductor can be reduced.

Moreover, even when an impact from the outside is applied, the joint portion is present at a portion between the outer peripheral recess and the outer peripheral terminal, so that it is possible to prevent the impact from being directly applied to the joint portion. For this reason, it becomes possible to raise the joint strength of a junction part. In addition, it is not necessary to tie the end of the winding to the binding terminal like an inductor having a conventional binding terminal, so it is possible to reduce the work man-hours, thereby reducing the cost. It becomes possible to plan.
Moreover, when a terminal is located in a clearance and bonding is performed, a built-up portion accompanying the bonding enters an outer peripheral recess. Thereby, it can prevent that a buildup part protrudes toward the outer peripheral surface side of an outer periphery terminal. Accordingly, the width dimension of the inductor can be reduced as compared with the configuration having the binding terminal and the configuration in which the terminal is joined to the outer peripheral surface of the outer peripheral terminal.
Further, the end of the winding can be positioned in the lead-out recess. Therefore, the end of the winding is sandwiched between the upper flange portion of the first core member and the other end of the second core member as compared with the case where the end of the winding is positioned (placed) on the other end surface. The upper flange portion and the other end surface can be reliably brought into contact with each other by preventing the pinching. Thereby, it is possible to prevent a gap from being formed between the upper flange portion and the other end surface, and it is possible to prevent magnetic flux leakage from occurring from the gap. In addition, since the end of the winding is led out from the lead-out recess and there is no pinched portion of the end, it is possible to prevent disconnection of the end of the winding due to the presence of the pinched portion.

In another invention, in addition to the above-described invention, the terminal member is provided with a fixing claw portion that engages with the other end surface of the second core member. When comprised in this way, the attachment attitude | position to the 2nd core member of a terminal member can be stabilized. In addition, the presence of the fixed claw portion can prevent the terminal member from being removed from the outer peripheral wall of the second core member even in an environment where vibration is repeatedly applied to the inductor. Thereby, it becomes possible to maintain the joining state of the terminal of a coil | winding in a favorable state over a long term.

Further, in another invention in addition to the respective inventions described above, the first core member, at both ends in the axial direction of the winding shaft, with a drum core having an upper flange portion and lower flange portions respectively, the second The core member is a ring core having an insertion hole, and the drum core is inserted into the insertion hole .

In the case of such a configuration, positioning at the time of winding of the winding can be easily performed by the upper flange portion and the lower flange portion existing on both end sides in the axial direction. For this reason, workability | operativity when winding a coil | winding becomes favorable.

In another invention, in addition to the above-mentioned invention, the outer peripheral recess is provided over the entire height direction of the outer peripheral surface of the second core member. When configured in this manner, the outer peripheral recess can cope with fluctuations in the length of the end of the winding. That is, even when the length dimension of the terminal is longer than the specified length, the terminal can be positioned. Therefore, it is not necessary to adjust the length of the terminal, and the workability at the time of joining can be improved.

Furthermore, in another invention, in addition to each of the above-described inventions, the outer circumferential recess is open to the outside on one side along the height direction of the outer circumferential surface of the second core member. In such a configuration, a joining operation such as soldering can be performed from a portion open to the outside. Therefore, workability is improved and a joining state such as soldering can be visually recognized from the outside.

According to another invention, in addition to the above-described inventions, the first core member further includes at least one flange portion including an upper flange portion, and the upper flange portion is the second core member. A positioning projection for positioning the first core member by engaging with the outer peripheral surface of the upper flange portion is provided on the other end surface of the second core member while contacting the other end surface over the entire circumference. It is what has been.

In such a configuration, the upper flange portion of the first core member abuts over the entire circumference of the other end surface of the second core member. Thereby, it is possible to prevent the magnetic flux from leaking to the outside on the side where the other end face exists. Further, due to the presence of the positioning protrusion, the first core member is positioned with respect to the second core member. For this reason, it is possible to improve workability in manufacturing the inductor.

  According to the present invention, it is possible to reduce the width dimension of the inductor. In addition, magnetic flux leakage in the inductor can be reduced.

  Hereinafter, an inductor according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing an overall configuration of an inductor 10 according to an embodiment of the present invention. FIG. 2 is a perspective view showing an internal configuration of the inductor 10 and shows a state in which the drum core 20 is transmitted. Further, FIG. 3 is a perspective view showing an internal configuration of the inductor 10 in a state where the openings 36 a of the outer peripheral recess 36 of the inductor 10 are present at both longitudinal ends. 4 is a cross-sectional view of the inductor 10 showing the cut surface of FIG. Further, FIG. 5 is a partial side sectional view showing the configuration of the lead-out recess 38 in the ring core 30 of the inductor 10.

  In the following description, the upper side (upper end side) refers to the side on which the upper flange portion 22 (described later) exists, and the lower side (lower end side) refers to the side on which the lower flange portion 23 (described later) exists. Shall point to.

  As shown in FIGS. 1 to 4, the inductor 10 is a surface mount type inductor, and includes a drum core 20, a ring core 30, a winding 40, and a terminal member 50.

  The drum core 20 and the ring core 30 are made of a magnetic material such as a nickel-based ferrite core. However, the material of the drum core 20 and the ring core 30 is not limited to the ferrite core, and may be other magnetic materials such as permalloy. The drum core 20 is disposed in an insertion hole 31 described later.

  As shown in FIGS. 3 and 4, a drum core 20 as a first core member includes a cylindrical winding shaft 21 and an upper flange portion 22 formed on both ends of the winding shaft 21 in the vertical direction and corresponding to the flange portion. And a lower flange portion 23 corresponding to the flange portion. In the present embodiment, the outer diameter of the upper flange portion 22 is larger than the outer diameter of the lower flange portion 23. However, the outer diameter of the upper flange portion 22 may be substantially the same as the outer diameter of the lower flange portion 23.

  A winding 40 is wound around a portion surrounded by the winding shaft 21, the upper flange portion 22, and the lower flange portion 23. The winding 40 is a round wire whose cross-sectional shape is circular, and is a wire whose periphery is covered with an insulating film. Further, in the present embodiment, the winding 40 uses an extra fine wire having a cross-sectional diameter of about 0.035 mm. However, the diameter of the winding 40 can be variously changed. In the following description, this portion (the portion surrounded by the winding shaft 21, the upper flange portion 22, and the lower flange portion 23) around which the winding 40 is wound is referred to as a winding frame portion 24.

  As shown in FIGS. 1 to 4, a ring core 30 as a second core member is provided on the outer peripheral side of the drum core 20. The ring core 30 is a member whose appearance is substantially ring-shaped. Therefore, the ring core 30 has a peripheral wall 30 a and an insertion hole 31 that is located in the center of the peripheral wall 30 a and passes through the ring core 30. The drum core 20 is inserted through the insertion hole 31. Therefore, the insertion hole 31 functions as an inner cylinder part.

  As shown in FIGS. 1 to 4, the upper end surface 30 b of the ring core 30 is in contact with the lower surface of the upper flange portion 22. That is, the upper end surface 30b is a portion for placing the upper flange portion 22 thereon. The ring core 30 is located on the outer peripheral side of the winding frame part 24 and on the outer peripheral side of the lower flange part 23. Thereby, the ring core 30 covers the outer peripheral sides of the winding frame portion 24 and the lower flange portion 23. The upper end surface 30b corresponds to the other end surface, and the lower end surface (not shown) of the ring core 30 on the side where the planar terminal 51 is provided corresponds to the one end surface.

  Here, as shown in FIG. 2, the ring core 30 is not a circular ring shape, but three tops of the four tops of the square are notched so as to be parallel to the diagonal of the square (hereinafter, The cutout portion is referred to as a ring outer peripheral small surface 32), and one apex portion is formed to draw an arc (hereinafter, this arc portion is referred to as an arc surface 33). In the following description, of the three ring outer peripheral small surfaces 32, the ring outer peripheral small surface 32 facing the circular arc surface 33 is referred to as a ring outer peripheral small surface 32a, and the other two ring outer peripherals adjacent to the circular arc surface 33 are used. The small surfaces 32 and 32 are referred to as ring outer peripheral small surfaces 32b and 32c, respectively.

  Further, as shown in FIGS. 1 and 2, a protrusion 34 as a positioning protrusion is provided on the above-described arc surface 33 side of the upper end surface 30b. The projecting portion 34 is a portion projecting upward from the upper end surface 30b, but has a projecting dimension such that it does not project upward from the upper flange portion 22 placed on the upper end surface 30b. . A surface of the protruding portion 34 that is erected with respect to the upper end surface 30b on the insertion hole 31 side is an arc surface 34a. The circular arc surface 34a is a portion that engages with the outer peripheral surface of the upper flange portion 22, and the circular arc surface 34a has a shape that follows the outer peripheral surface.

  When the upper flange portion 22 comes into contact with the circular arc surface 34a, the drum core 20 is positioned with respect to the ring core 30. In addition, the protrusion part 34 is not restricted to the structure shown by FIG. 1 and FIG. 2, It is good also as a structure from which the one or more pin-shaped member protrudes from the upper end surface 30b.

  As shown in FIGS. 1, 4, etc., a mounting recess 35 is provided on the lower surface side of the ring outer peripheral small surfaces 32 b and 32 c of the ring core 30. The mounting recess 35 is a portion in which a part of the lower surface of the ring core 30 is cut out upward by a predetermined dimension. In the present embodiment, the mounting recess 35 is cut out over the entire radial direction of the ring core 30. The notch dimension of the mounting recess 35 is such that when a flat terminal 51 described later is positioned in the mounting recess 35, the flat terminal 51 protrudes slightly below the lower surfaces of the ring core 30 and the drum core 20. It is provided with a size of about. Further, the ring core 30 may adopt a configuration in which the formation of the mounting recess 35 is omitted.

  Moreover, the outer periphery recessed part 36 is provided in the ring outer peripheral small surfaces 32b and 32c. The outer peripheral recess 36 is a portion that is recessed toward the inner diameter side by a predetermined dimension from the other portions of the ring outer peripheral small surfaces 32b and 32c. Here, the above-mentioned predetermined dimension is sufficient to position the terminal 41 of the winding 40 in the outer peripheral recess 36 surrounded by the outer peripheral terminal 52 in a state where the outer peripheral terminal 52 described later is positioned on the ring outer peripheral small surfaces 32b and 32c. The depth (size) is such that it can be used. That is, the depth dimension of the outer peripheral recess 36 is equal to or slightly larger than the diameter of the terminal 41.

  In the present embodiment, the outer peripheral recess 36 is provided at the peripheral end portions of the ring outer peripheral small surfaces 32b and 32c. Therefore, the outer peripheral recess 36 and the ring outer peripheral small surfaces 32b and 32c are stepped. And the outer periphery terminal 52 mentioned later is attached so that the outer periphery recessed part 36 of this state may be covered. For this reason, the outer peripheral recess 36 is closed on the outer diameter side by the outer peripheral terminal 52, and one side in the circumferential direction of the ring core 30 is provided in an open state, so that the joining state of the terminal 41 can be visually recognized from the outside. It has become. Further, in the present embodiment, the outer peripheral recess 36 is provided in a state of cutting through the ring outer peripheral small surfaces 32 b and 32 c over the entire vertical direction of the ring core 30.

  In the following description, the above open part is referred to as an opening 36a.

  Further, as shown in FIGS. 1, 2, 4, and 5, a lead-out recess 38 is provided on the upper end surface 30 b of the ring core 30. The lead-out concave portion 38 is a portion for guiding the terminal 41 of the winding 40 wound around the winding frame portion 24 toward the outer peripheral concave portion 36. Here, in order to prevent magnetic flux leakage, the lead-out recess 38 has a configuration in which the upper end surface 30b of the ring core 30 is recessed by a depth dimension and a width dimension necessary for positioning the terminal 41.

  Here, when the lead-out recessed portion 38 is viewed from the side, as shown in FIG. 5, the bottom portion of the recess is a substantially flat portion, and the whole is formed to have a substantially V-shape. However, the side shape of the lead-out recess 38 is not limited to this. For example, in accordance with the shape of the terminal 41 of the winding 40, the lower side thereof may be formed in a circular arc shape (the whole is substantially U-shaped).

  A terminal member 50 is attached to the attachment recess 35 and the ring outer peripheral small surfaces 32b and 32c. The terminal member 50 is a component formed by bending or punching a plate-shaped metal member by pressing. The terminal member 50 includes a flat terminal 51, an outer peripheral terminal 52, and a fixed claw portion 53. Among these, the flat terminal 51 is a portion having an adhesive surface bonded and fixed to the attachment recess 35 as a back surface. As shown in FIGS. 1 to 4, the planar terminal 51 is disposed on the lower surface side of the inductor 10, and when the inductor 10 is surface-mounted on a substrate (not shown), Become. The planar terminal 51 is electrically connected and fixed to the land of the substrate by reflow soldering.

  As shown in FIGS. 1 to 4, the outer peripheral terminal 52 is bent from the flat terminal 51 in a state of approximately 90 degrees. The outer peripheral terminal 52 is positioned in contact with the ring outer peripheral small surfaces 32b and 32c. In this way, the outer diameter side of the outer peripheral recess 36 is covered with the outer peripheral terminal 52, thereby forming the gap portion 37.

  The terminal 41 is joined to the outer peripheral terminal 52 by, for example, soldering. However, in addition to such soldering, the terminal 41 may be joined to the outer peripheral terminal 52 by, for example, laser beam welding by laser beam irradiation or other various types of welding.

  In the present embodiment, the outer peripheral terminal 52 has a height dimension that is slightly lower than the height dimension of the ring outer peripheral small surfaces 32b and 32c. A fixed claw 53 extends from the upper end portion of the outer peripheral terminal 52. The fixed claw portion 53 is bent from the outer peripheral terminal 52 at an angle of approximately 90 degrees, and extends in the same direction as the planar terminal 51 (in the direction toward the inner diameter side of the inductor 10 in FIGS. 1 to 4). Yes.

  Further, the fixed claw portion 53 is provided on the peripheral end side of the upper end portion of the outer peripheral terminal 52 that is separated from the side covering the outer peripheral recess 36. Further, in the present embodiment, the width dimension of the fixed claw portion 53 is provided to be smaller than the width dimension of the planar terminal 51 and the outer peripheral terminal 52. Furthermore, the fixed claw portion 53 extends in a direction parallel to the upper end surface 30 b by a length dimension that does not interfere with the upper flange portion 22.

  The fixed claw portion 53 is in a state of being locked to the upper end surface 30b when the flat terminal 51 and the outer peripheral terminal 52 are attached to the mounting recess 35 and the ring outer peripheral small surfaces 32b and 32c, respectively (see FIG. 1 and others). ). That is, the fixed claw portion 53 is a portion for locking the terminal member 50.

  In the present embodiment, the fixed claw portion 53 is in contact with the upper end surface 30b. However, a predetermined gap may be present between the fixed claw portion 53 and the upper end surface 30b, and an adhesive may be interposed in the gap. Further, the terminal member 50 is bonded to the back surface of the flat terminal 51 by an adhesive or the like, but the back surface of the outer peripheral terminal 52 is independent on the back surface of the outer peripheral terminal 52 (the surface joined to the ring outer peripheral small surfaces 32b and 32c). Alternatively, it may be bonded together with the flat terminal 51 by an adhesive or the like.

  When manufacturing the inductor 10 having the above configuration, first, the winding 40 is wound around the winding frame portion 24. After such winding is completed, the drum core 20 is inserted from above the insertion hole 31 so that the lower surface of the upper flange portion 22 is in contact with the upper end surface 30 b of the ring core 30. At this time, the outer peripheral surface of the upper flange portion 22 is brought into contact with the circular arc surface 34a.

  In addition, when inserting the above-described drum core 20, an adhesive is applied to the upper flange portion 22, or the upper end surface 30b, the arc surface 34a, and the like to bond them together. However, adhesion may be performed after the drum core 20 is lightly fitted to the ring core 30 and positioned.

  Further, when the drum core 20 is inserted into the insertion hole 31, the winding 40 is simultaneously inserted into the lead-out recess 38. Subsequently, the winding 40 is bent at the boundary portion between the lead-out recess 38 and the outer periphery recess 36 so that the winding 40 enters the gap 37. The winding 40 is cut before and after the insertion, and the terminal 41 of the winding 40 is in a state of being positioned in the lead-out recess 38 and the gap 37.

  Next, an adhesive is applied to at least the back side of the flat terminal 51 of the terminal member 50, and the flat terminal 51 and the outer peripheral terminal 52 of the terminal member 50 are respectively attached to the mounting recess 35 and the ring outer peripheral small surfaces 32b and 32c. Keep in contact. In addition, you may make it apply | coat an adhesive also to the part contact | abutted to the ring outer peripheral small surfaces 32b and 32c among the outer periphery terminals 52, and the part contact | abutted to the upper end surface 30b among the fixed claw parts 53.

  Subsequently, the terminal 41 is soldered to the outer peripheral terminal 52. In this case, it is only necessary to insert solder from the opening 36a and apply heating and melting means such as a soldering iron. Then, the terminal 41 is soldered to the outer peripheral terminal 52. As described above, the inductor 10 as shown in FIG. 1 and others is manufactured.

  According to the inductor 10 having such a configuration, the terminal 41 of the winding 40 is located in the gap portion 37. For this reason, the joint between the outer peripheral terminal 52 and the terminal 41 is also present in the gap 37 between the outer peripheral recess 36 and the outer terminal 52. Thereby, since the buildup part accompanying joining of the terminal 41 and the outer periphery terminal 52 also exists in the clearance gap part 37, it becomes possible to prevent this buildup part projecting outside.

  As a result, the width dimension of the inductor 10 can be reduced as compared with the configuration in which the terminal 41 of the winding 40 is entangled with the binding terminal protruding toward the outer diameter side. In addition, the width dimension of the inductor 10 can be reduced even when compared with a configuration in which an overlaid portion by soldering exists on the outer peripheral surface side of the outer peripheral terminal 52.

  In particular, the build-up portion due to soldering may have a long protruding length due to the surface tension of wet solder when the soldering iron is released, and this situation becomes significant in the small-sized inductor 10. . However, in the present invention, since the gap portion 37 is provided and the build-up portion is accommodated in the gap portion 37, such a problem of surface tension does not occur. Thereby, downsizing of the inductor 10 can be advanced.

  In addition, since the joint portion between the terminal 41 and the outer peripheral terminal 52 exists in the gap portion 37, the joint portion is covered with the outer peripheral terminal 52. Therefore, it is possible to prevent a direct impact from being applied to the joint portion, and it is possible to increase the joint strength at the joint portion. Moreover, since the operation | work which ties the terminal 41 to a binding terminal becomes unnecessary, it becomes possible to reduce an operation man-hour and it can aim at reduction of cost thereby.

  The outer peripheral recess 36 is provided over the entire height direction of the outer peripheral surface of the ring core 30. Therefore, even if the length dimension of the terminal 41 slightly varies with respect to the specified length, the terminal 41 is joined to the outer peripheral terminal 52 as long as the terminal 41 has a length that reaches the outer peripheral recess 36. be able to. Therefore, it is not necessary to adjust the length of the terminal 41 for joining to the outer peripheral terminal 52, and workability at the time of joining can be improved.

  Further, the outer peripheral recess 36 is provided with an opening 36 a on one side along the height direction of the outer peripheral surface of the ring core 30. Therefore, when joining the terminal 41 to the outer peripheral terminal 52, a joining operation such as soldering can be performed by inserting a soldering iron from the open opening 36a, thereby improving workability. . At the same time, the presence of the opening 36a makes it possible to visually recognize a joining state such as soldering from the outside, and to improve the joining reliability.

  In the present embodiment, the drum core 20 is used as the first core member. Moreover, the lower surface of the upper flange portion 22 of the drum core 20 is in contact with the upper end surface 30 b of the ring core 30 over the entire circumference in the circumferential direction. Therefore, it is possible to prevent the magnetic flux from leaking to the outside between the upper flange portion 22 and the ring core 30. Further, in the drum core 30, since there are flange portions such as the upper flange portion 22 and the lower flange portion 23, it is possible to easily position the winding 40 during winding. For this reason, workability | operativity in the case of winding the coil | winding 40 becomes favorable.

  Further, the ring core 30 is provided with a protrusion 34. For this reason, the drum core 20 can be positioned with respect to the ring core 30 by engaging the outer peripheral surface of the upper flange portion 22 with the arc surface 34 a of the protruding portion 34. Thereby, the workability at the time of manufacturing the inductor 10 can be improved.

  Further, a lead-out recess 38 is provided on the upper end surface 30 b of the ring core 30, and the terminal 41 of the winding 40 is led out toward the outer peripheral recess 36 through the lead-out recess 38. This prevents the terminal 41 of the winding 40 from being sandwiched between the upper flange portion 22 and the upper end surface 30b, as compared with the case where the terminal 41 of the winding 40 is placed on the upper end surface 30b. be able to. Therefore, it is possible to prevent a gap from being formed between the upper flange portion 22 and the upper end surface 30b, and the upper flange portion 22 can be joined over the entire circumference of the upper end surface 30b. Can be improved.

  Further, since the terminal 41 exists in the lead-out recess 38, only the lead-out recess 38 has a gap in the circumferential direction of the upper end surface 30b. Therefore, magnetic flux leakage can be reduced as compared with a configuration in which a gap exists over the entire circumference of the upper end surface 30b. Further, the terminal 41 of the winding 40 is led out from the lead-out recess 38, and there is no clamping portion of the terminal 41. Thus, the presence of the pinched portion of the terminal 41 makes it possible to prevent the terminal 41 from being disconnected. In particular, in the present embodiment, the lead-out recess 38 (see FIG. 5) is smaller in opening than the conventional recess 2 (see FIG. 6), and the depth dimension necessary for positioning the terminal 41 and Only the width dimension is recessed. Therefore, it is possible to suppress a decrease in the magnetic field strength of the inductor 10.

  Further, in the present embodiment, the width dimension of the outer peripheral terminal 52 is made larger than the width dimension of the fixed claw portion 53. Therefore, the solder can be satisfactorily received by the outer peripheral terminal 52 during soldering.

  Although one embodiment of the present invention has been described above, the present invention can be variously modified in addition to this. This will be described below.

  In the above-described embodiment, the case where the drum core 20 is used as the first core member and the ring core 30 is used as the second core member has been described. However, the first core member and the second core member are not limited to the drum core 20 and the ring core 30. For example, the first core member is a T-shaped core (a core member having only the upper flange portion 22 and not the lower flange portion 23), and the second core member is a pot core (T in the central portion). A core member having a recessed portion into which the character-shaped core is fitted may be used.

  Also in this case, similarly to the drum core 20, if the upper flange portion 22 is placed on the upper end surface 30b, the configuration similar to the inductor 10 in the above-described embodiment (the outer peripheral recess 36 is formed on the outer peripheral surface of the pot core). The terminal member 50 is attached in a state of covering the outer peripheral recess 36 provided. Therefore, even in an inductor that employs such a T-shaped core and a pot core, the width dimension can be reduced. Further, since the pot core has a bottom portion below, it is possible to reduce magnetic flux leakage in the lower portion.

  In the above-described embodiment, the case where the present invention is applied to the surface mount type inductor 10 has been described. However, the inductor of the present invention is not limited to the surface mount type, and may be an inductor including a terminal member having a mounting terminal protruding downward.

  In the above-described embodiment, the type of inductor 10 in which the drum core 20 is covered with the ring core 30 is described. However, the inductor is not limited to such a type, and instead of the second core member, a case body made of a resin or the like of a non-conductive member is used, and the first core member is covered with this case body. There may be.

  Furthermore, in the above-mentioned embodiment, the structure provided with the fixed nail | claw part 53 and the substantially U-shaped terminal member 50 is demonstrated. However, as the terminal member, for example, a substantially L-shaped terminal member in which the fixed claw portion 53 is omitted may be used.

  In the above-described embodiment, the drum core 20 is described as the first core member, and the ring core 30 is described as the second core member. However, the first core member and the second core member are not limited to these. For example, a closed magnetic path type E-type core may be provided with an outer peripheral recess, a lead-out recess, and the like similar to those described above.

  Furthermore, in the above-described embodiment, the outer circumferential surface of the ring core 30 is recessed to provide the outer circumferential recess 36 and the outer circumferential terminal 52 covers the clearance 37. However, the gap 37 is not limited to the configuration in which the outer peripheral recess 36 is provided. For example, the back surface side of the outer peripheral terminal 52 is recessed by a dimension corresponding to the terminal 41 and the recess is not formed on the outer peripheral surface of the ring core 30. The gap portion 37 into which the terminal 41 can enter is provided even when both of these configurations are brought into contact with each other.

  Moreover, in the above-mentioned embodiment, the outer periphery recessed part 36 is located in the edge part side of the terminal member 50, and the structure in which the opening part 36a exists is employ | adopted. However, the outer periphery recessed part 36 is not restricted to the structure in which the opening part 36a exists, You may employ | adopt the structure in which the opening part 36a does not exist. In addition, when employ | adopting the structure which does not have the opening part 36a, you may employ | adopt the structure where an outer periphery recessed part is located in the center part of the width direction of the outer periphery terminal 52. FIG.

  In the above-described embodiment, the case where the winding 40 having a circular cross section is used as the winding is described. However, the winding is not limited to the winding 40 having a circular cross section, and other types of windings such as a winding having a rectangular cross section may be used.

  In addition, for example, in a separate electronic member such as a transformer or a filter, an outer peripheral recess, a lead-out recess, or the like similar to the above-described embodiment may be provided.

  The inductor of the present invention can be used in the field of electrical equipment.

It is a perspective view which shows the external appearance shape of the inductor which concerns on one embodiment of this invention. It is a perspective view which shows the internal structure of the inductor of FIG. 1, and is a figure which shows the state which permeate | transmitted the drum core. FIG. 2 is a perspective view showing the internal configuration of the inductor while being cut in a state in which the openings of the outer circumferential concave portion are present at both ends of the longitudinal portion, related to the inductor of FIG. 1. It is a figure which shows the cut surface of the inductor of FIG. 3, and is a sectional side view of an inductor. FIG. 3 is a partial view showing a shape of a lead-out recess existing in the ring core in the inductor of FIG. 1, and a side cross-sectional view showing a state where the drum core and the like are cut with the lead-out direction of the winding as a normal line. It is a fragmentary figure which shows the shape of the recessed part which exists in the conventional ring core, and is a sectional side view which shows the state which cut | disconnected the drum core etc. by making the derivation | leading-out direction of a winding | coil into a normal line.

Explanation of symbols

10 ... Inductor 20 ... Drum core (corresponding to the first core member)
21 ... winding axis 22 ... upper flange (corresponding to flange)
23 ... Lower flange (corresponding to the flange)
24 ... reel part 30 ... ring core (corresponding to the second core member)
31 ... Insertion hole (corresponding to the inner cylinder)
34 ... Projection (corresponding to positioning projection)
35 ... Mounting recess 36 ... Outer periphery recess 38 ... Derivation recess 40 ... Winding 41 ... Terminal 50 ... Terminal member 51 ... Planar terminal 52 ... Outer periphery terminal

Claims (6)

A first core member having a winding shaft;
A winding wound around the outer peripheral surface of the winding shaft;
A second core member having an inner cylinder part surrounded by a peripheral wall, and arranging the first core member in the inner cylinder part;
A terminal member that is located on the outer peripheral surface of the second core member, has an outer peripheral terminal that joins the end of the winding, and a flat terminal that protrudes from one end surface of the second core member and is mounted on the mounting portion. When,
Comprising
Between the outer peripheral surface of the peripheral wall and the outer peripheral terminal, a gap portion for allowing the terminal to enter is provided, and the gap portion is recessed in the outer peripheral surface of the peripheral wall of the second core member. The outer peripheral recess formed by the outer peripheral terminal is covered,
The terminal is joined to the outer peripheral terminal in the gap ,
The other end surface of the second core member is provided with a lead-out recess that is recessed from the other end surface, and the terminal of the winding is led out toward the outer peripheral recess through the lead-out recess. inductor, characterized in that that. Wherein the terminal member, the inductor of claim 1, wherein the fixing claw portion engaged with the other end surface of said second core member is provided. The first core member is a drum core having an upper flange portion and a lower flange portion on both ends in the axial direction of the winding shaft, respectively, and the second core member is a ring core having an insertion hole, 3. The inductor according to claim 1, wherein the drum core is inserted through the insertion hole. 4. The inductor according to claim 1, wherein the outer circumferential recess is provided over the entire height direction of the outer circumferential surface of the second core member. 5. 5. The inductor according to claim 1, wherein the outer peripheral recess has one side along the height direction of the outer peripheral surface of the second core member open to the outside. . The first core member has at least one flange portion including an upper flange portion, and the upper flange portion contacts the other end surface of the second core member over the entire circumference thereof. In addition, the other end surface of the second core member is provided with a positioning projection for engaging the outer peripheral surface of the upper flange portion to position the first core member. The inductor according to any one of 1 to 5.

Images