Antenna component and cap component

Abstract

A cap (10) is adhered to a core (20) by a first adhesive (50). The cap (10) includes a pedestal (12) and a protrusion (14). The pedestal (12) is positioned further to one side in the axial direction than the core (20). The protrusion (14) protrudes from the pedestal (12) toward another side that is opposite the one side in the axial direction. The protrusion (14) covers a side surface (20b) of the core (20). The protrusion (14) has an inner circumferential surface (14a). The inner circumferential surface (14a) is opposite the side surface (20b) of the core (20). A recess (16) is formed in the protrusion (14). The recess (16) opens at the inner circumferential surface (14a). The first adhesive (50) is provided in the recess (16).

Description

Antenna parts and cap parts

[0001] The present invention relates to an antenna component and a cap component.

[0002] In a component having a core and a member covering one surface of the core, the core may be adhered to the member with an adhesive. Regarding this type of technology, Patent Document 1 below discloses a support plate (17) having a plurality of holes (21) drilled therein, as shown in FIG. 1 of Patent Document 1. The holes are filled with a thermosetting adhesive (20), and a pot-shaped ferrite core (16) is fixed to the support plate (17) by the thermosetting adhesive. Meanwhile, in antenna components, a long core may be used.

[0003] Japanese Patent Application Laid-Open No. 2002-15921

[0004] However, when covering the end face of a long core with a member, even if an adhesive is filled into a hole drilled in the member, a problem may arise in that the adhesive is not sufficient to bond the end face of the core to the member. Specifically, because the area of ​​the end face of the core is small compared to the longitudinal dimension of the core, when stress is applied to the core so that the core tilts relative to the longitudinal direction, the end face of the core may easily separate from the member. For example, the end face of the core may easily separate from the member, causing the end face to peel off from the member.

[0005] The present invention has been made in view of the above-mentioned problems, and provides an antenna component in which a long core can be favorably bonded with an adhesive to a member covering an end face of the core.

[0006] The antenna component of the present invention comprises a core that is elongated in the axial direction and has an end face facing the axial direction and a side face facing a direction intersecting the axial direction, a coil that is spirally formed around the core, a case that houses the core and the coil and opens to one side in the axial direction, and a cap that is located on the one side of the core and is adhered to the core with a first adhesive that is an adhesive, wherein the cap includes a base portion that is located on the one side of the core, and a protruding portion that protrudes from the base portion toward the other side opposite to the one side in the axial direction and covers the side face, and the protruding portion has an inner surface that faces the side face, and a recess that opens to the inner surface is formed in the protruding portion, and the first adhesive is disposed in the recess.

[0007] The cap part of the present invention is a cap part that is attached to one end of a long core with an adhesive, and is characterized in that the cap part has a space in which the one end is placed when the one end is attached to the cap part, and has a base part having a main surface that faces the end face of the core when the one end is inserted into the space, and a protrusion part that protrudes from the base part in a direction intersecting the main surface, the protrusion part having an inner surface that defines the space, and the protrusion part has a recess formed in it that opens into the inner surface.

[0008] In the antenna component of the present invention, the cap is a member that covers the end face of the core. An adhesive is disposed in a recess that opens to the inner peripheral surface of the protruding portion of the cap, and the core is fixed to the cap by the adhesive. The adhesive that fixes the core to the cap is disposed so as to penetrate into the recess of the cap, so that the adhesive can effectively bond the core to the cap. For example, even if stress is applied to the core so that the core tilts in the longitudinal direction (axial direction), the adhesive is unlikely to separate from the cap because it is disposed so as to penetrate into the recess of the cap.

[0009] According to the antenna component of the present invention, the adhesive for fixing the core to the cap is disposed so as to penetrate into the recess of the cap, thereby providing an antenna component in which the long core can be satisfactorily bonded to the cap that covers the end face of the core with the adhesive.

[0010] The above-mentioned objects, as well as other objects, features and advantages, will become more apparent from the preferred embodiments described below and the accompanying drawings.

[0011] 7( a ) is a perspective view of an antenna component according to a first embodiment of the present invention. The case is not shown. FIG. 7( b ) is a top view of the antenna component according to the first embodiment. The case is not shown. The outline of the core is shown by a dotted line. FIG. 7( c ) is a right side view of the antenna component according to the first embodiment. The case is not shown. FIG. 7( b ) is a bottom view of the antenna component according to the first embodiment. The case is not shown. FIG. 7( c ) is a front view of the antenna component according to the first embodiment. The case is not shown. FIG. 7( a ) is a perspective view of a cap (cap component) according to the first embodiment. FIG. 7( b ) is a front view of a cap (cap component) according to the first embodiment. FIG. 7( c ) is a cross-sectional view of a cross-section along the dashed dotted line shown in FIG. 3 , taken along the arrow VIII-VIII. The case is not shown. FIG. 7( b ) is an enlarged view of a portion of the rear side of the cross-sectional view shown in FIG. 6.

[0012] The various components of the antenna components and cap components of the present invention do not need to be independent entities, and it is acceptable for multiple components to be formed as a single member, for one component to be formed from multiple members, for one component to be part of another component, or for part of one component to overlap with part of another component, etc.

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In each drawing, corresponding components are designated by the same reference numerals, and redundant description will be omitted where appropriate. In this embodiment, the front-rear, left-right, top-bottom directions will be defined as shown in the drawings. However, these definitions are provided for convenience in order to easily explain the relative relationships between the components, and do not limit the directions during manufacture or use of a product embodying the present invention. In other words, the antenna component is not limited to being used with the top-bottom direction as the vertical direction. Here, the front-rear direction coincides with the axial direction described below. Furthermore, the left-right direction coincides with the width direction of the antenna component. The top-bottom direction coincides with the thickness direction of the antenna component. Furthermore, the term "plane" as used in this invention refers to a shape that is physically formed with a flat surface as the target, and naturally does not need to be a perfect geometric plane.

[0014] First Embodiment (Antenna Component) FIG. 1 is a schematic plan view showing an example of an antenna component 100 according to a first embodiment of the present invention.

[0015] First, an overview of the antenna component 100 of this embodiment will be described. The antenna component 100 includes a core 20, a coil 30, a case 40, and a cap 10. The core 20 is elongated in the axial direction. The core 20 has an end face 20a facing the axial direction and a side face 20b facing a direction intersecting the axial direction. The coil 30 is spirally formed around the core 20. The case 40 houses the core 20 and the coil 30. The case 40 opens on one side in the axial direction (toward the rear). The cap 10 is located on one side in the axial direction (rearward) of the core 20. The cap 10 is bonded to the core 20 with a first adhesive 50. The first adhesive 50 and a second adhesive 60 (described later) are adhesives. The cap 10 includes a base portion 12 and a protrusion 14. The base 12 is located on one side (rearward) of the core 20 in the axial direction. The protrusion 14 protrudes from the base 12 toward the other side (forward) opposite to the one side in the axial direction. In other words, the protrusion 14 protrudes toward the forward side from the base. The protrusion 14 also covers the side surface 20b of the core 20. The protrusion 14 has an inner circumferential surface 14a, which faces the side surface 20b of the core 20. A recess 16 is formed in the protrusion 14. The recess 16 opens at the inner circumferential surface 14a. A first adhesive 50 is disposed in the recess 16. In the antenna component 100 of this embodiment, the cap 10 is a member that covers the end surface 20a of the core 20. An adhesive (first adhesive 50) is disposed in the recess 16 that opens into the inner circumferential surface 14a of the protruding portion 14 of the cap 10, and the core 20 is fixed to the cap 10 by the first adhesive 50. The first adhesive 50 that fixes the core 20 to the cap 10 is disposed so as to enter the recess 16 of the cap 10, so that the first adhesive 50 can favorably bond the core 20 to the cap 10. For example, even if stress is applied to the core 20 such that the core 20 tilts in the longitudinal direction (axial direction), the first adhesive 50 is unlikely to separate from the cap 10 because the adhesive is disposed so as to enter the interior of the recess 16 of the cap 10.

[0016] Next, the antenna component 100 of this embodiment will be described in detail. The antenna component 100 is a component that constitutes all or part of a component that functions as an antenna. Specifically, the antenna component 100 in this embodiment is the case 40, the cap 10, and the contents (coil 30 and core 20) housed in the case 40 and the cap 10. As will be described later, the coil 30 in the case 40 may be connected to components outside the case 40 (e.g., a substrate or capacitor disposed outside the case 40), and the antenna may be composed of the case 40, the cap 10, the contents, and the components outside the case 40. In this case, only the case 40, the cap 10, and the contents are referred to as the antenna component 100, and the components outside the case 40 are not included in the antenna component 100. The antenna component 100 in this embodiment has a closed electronic circuit and functions independently. Alternatively, the antenna component 100 may be electrically connected to other devices or components (e.g., devices or components outside the case 40). Specifically, the antenna component 100 may form an electronic circuit together with the other device or component, and become a part of an electrical device.

[0017] The antenna component 100 in this embodiment is an RF tag (Radio-Frequency Identification Tag) that can be used to identify or detect an item, etc. The RF tag of this embodiment, which can be miniaturized, can be attached to a medical member such as gauze or a medical instrument such as a surgical instrument that is placed or left in a living body temporarily or long-term. The use of the antenna component 100 is not limited to the above, and the antenna component 100 may be mounted on something other than a medical instrument such as a medical member or a surgical instrument. Furthermore, the antenna component 100 is not limited to being small as described above, and may also be large.

[0018] The core 20 is a magnetic member made of a magnetic material. Examples of magnetic materials include ferrite. The core 20 of this embodiment is an elongated member whose longitudinal direction is the axial direction (the spiral axis direction of the spiral coil 30, which will be described later; the front-to-back direction in the figure). Here, "elongated" means that the dimension in the longitudinal direction is larger than other dimensions. Specifically, the dimension of the core 20 of this embodiment in the axial direction is larger than the dimensions of the core 20 in the up-down or left-to-right direction. More specifically, the dimension of the core 20 in the axial direction is larger than the diameter of the core 20, which has a circular cross section. The axial center of the core 20 is an axis passing through the center of the cross section of the core 20. In this embodiment, the axial center of the core 20 is a linear axis passing through the center of the circular cross section of the core 20. In this embodiment, the cross section of the core 20 is circular (a perfect circle). Alternatively, the cross section of the core 20 may be polygonal, elliptical, or another shape. Hereinafter, the radial direction from the axial center of the core 20 toward the side surface of the core 20 may be referred to as the radial direction, the radial direction of the core 20, or simply as the radial direction. In other words, in a cross section of the core 20, the direction from the center of the cross section toward the periphery of the cross section is the radial direction or the radial direction of the core 20. Regardless of whether the cross section of the core 20 is circular or has another shape including a polygon, the radial direction or the radial direction of the core 20 is the radial direction from the axial center of the core 20 toward the side surface of the core 20.

[0019] The surface of the core 20 includes an end face 20a and a side face 20b. The end face 20a of the core 20 is a face facing in either direction in the axial direction. The side face 20b of the core 20 is a face of the surface of the core 20 facing in a direction intersecting the axial direction. More specifically, the side face 20b of the core 20 is a face of the surface of the core 20 facing radially outward.

[0020] In this embodiment, the coil 30 is arranged in a spiral shape around the core 20. The coil 30 is made of a conductive material, such as a metal such as copper. In this embodiment, the coil 30 is arranged immediately outside the core 20 in the radial direction (no other components are arranged between the core 20 and the coil 30). Alternatively, other components may be arranged between the coil 30 and the core 20. In this embodiment, the coil 30 is formed by winding a coil wire 34a in a spiral shape around the core 20. Individual strands of the coil wire in the winding portion of the coil 30 shown in FIG. 2 are not shown. The same applies to FIGS. 1 to 6 and 9. The shape of the coil 30 is not limited to the shapes shown in the drawings and includes various shapes that function as a coil. In this embodiment, the coil 30 is formed by winding the coil wire 34a around the core 20, with the axis of the core 20 serving as the winding axis. In the present embodiment, the step of winding the coil wire 34a around the core 20 is performed after the core 20 is fixed to the cap 10 with an adhesive. In this case, the core 20, which is bonded with the adhesive in this step, is less likely to separate from the cap 10, and the core 20 is more likely to remain well bonded to the cap 10. Specifically, by providing the recess 16 in the cap 10 and arranging the first adhesive 50 in the recess 16, the core 20 is less likely to separate from the cap 10 even when stress is applied to the core 20 from the coil wire 34a in this step. Alternatively, the step of winding the coil wire 34a around the core 20 may be performed before the core 20 is attached to the cap 10 and the base 90. Alternatively, the coil 30 may be formed in a spiral shape around the core 20 by inserting a core into the coil 30, which is formed in a spiral shape. Furthermore, the coil 30 is not limited to being formed from the coil wire 34a, and may be formed from other conductive materials.

[0021] The coil wire 34a in this embodiment is a conductive linear member. The cross-sectional shape of the coil wire 34a may be circular or polygonal, or may be a flat shape such as an oval or rectangle. In this embodiment, the coil wire 34a is configured by coating a conductive core with an insulating coating. Examples of materials for the insulating coating include resins such as polyurethane. The lead-out portion 34b of the coil wire 34a is drawn out from the coil 30 (particularly the spirally wound portion). Specifically, the lead-out portion 34b is drawn out from the coil 30 toward a capacitor (chip capacitor 80) described below. In other words, the lead-out portion 34b is drawn out from the coil 30 toward a base 90 described below. In this embodiment, both lead-out portions 34b of the coil wire 34a are connected to both electrodes of the chip capacitor 80, respectively. However, this is not limited to this. Only one end of the coil wire 34a (one lead-out portion 34b) may be connected to one electrode of the chip capacitor 80. In this case, the other end (other lead-out portion 34b) of the coil wire 34a may be connected directly or indirectly to a terminal or the like of another member that constitutes an electronic circuit together with the antenna component 100.

[0022] The antenna component 100 in this embodiment includes a capacitor housed in a case 40, which will be described later. The capacitor in this embodiment is a chip capacitor 80. The chip capacitor 80 is a capacitor in which part of the electrode surface is a planar electrode surface. The chip capacitor has electrodes on both ends in the left and right directions. As shown in FIG. 2, the shape of the chip capacitor 80 in this embodiment is approximately rectangular, but the shape of the chip capacitor 80 is not limited to this. Alternatively to this embodiment, the antenna component 100 may not include a capacitor.

[0023] The lead-out portion 34b of the coil wire 34a is electrically connected, directly or indirectly, to the electrode of the chip capacitor 80. Specifically, the lead-out portion 34b of the coil wire 34a is in contact with the electrode of the chip capacitor 80 and electrically connected to the electrode of the chip capacitor 80, or is indirectly electrically connected to the electrode of the chip capacitor 80 via another conductive member such as a brazing material (not shown). Of the surface of the lead-out portion 34b of the coil wire 34a, a portion that is in contact with the electrode of the chip capacitor 80 or a portion that is in contact with the brazing material is preferably not covered with an insulating coating. In other words, this portion is preferably exposed from the insulating coating.

[0024] As shown in FIG. 1 or 2 , the antenna component 100 further includes a base 90. The base 90 is preferably formed of an insulating material, and in this embodiment, the base 90 is formed of resin. The base 90 holds the chip capacitor 80. Preferably, as described below, the base 90 holds the core 20 in addition to the chip capacitor 80. In this embodiment, the chip capacitor 80 is held in the base 90 by being partially housed in the base 90. As shown in FIG. 6 , the base 90 is formed with an accommodating recess 92 that opens forward. At least a portion of the chip capacitor 80 is housed inside the accommodating recess 92. As shown in FIG. 6 , the chip capacitor 80 is arranged so that the chip capacitor 80 contacts the bottom (the surface facing forward) of the accommodating recess 92. The chip capacitor 80 and the bottom of the accommodating recess 92 may be in direct contact, or the chip capacitor 80 may be adhered to the base 90 by an adhesive (not shown) applied to the bottom surface of the base 90. The base 90 is not limited to a shape having the accommodating recess 92, and may have any shape capable of holding the chip capacitor 80. For example, the base 90 may have a structure capable of holding the chip capacitor 80 (e.g., a structure capable of engaging with the chip capacitor 80). Alternatively, the base 90 may have a portion capable of holding the chip capacitor 80 using another member such as an adhesive (e.g., a surface to which an adhesive can be applied). Alternatively, instead of this embodiment, the antenna component 100 may not have a base 90. For example, the coil 30 and the chip capacitor 80 may be housed in a case 40 (described later) to hold the coil 30 and the chip capacitor 80 in a desired positional relationship. Alternatively, the chip capacitor 80 may be directly connected to another member such as the core 20.

[0025] The core 20 is fixed to the base 90 as follows. As shown in Figure 2, a space for fitting the core 20 (particularly its front end) is formed in a portion of the rear side of the base 90 (the core accommodating recess 94 in this embodiment). This core accommodating recess 94 is open upward and rearward. The core 20 is fixed to the base 90 by fitting it into the core accommodating recess 94 of the base 90 from above downward or from rearward to frontward.

[0026] The base 90 of this embodiment has a fixing portion 96 to which the end of the coil wire 34a is fixed. The fixing portion 96 in this embodiment is a tying portion around which the end of the coil wire 34a is tyingly fixed. More specifically, the fixing portion 96 is formed to protrude outward (particularly radially outward; upward or downward in this embodiment) from the surface (upper or lower surface) of the base 90. As shown in FIG. 3 , the protruding end of the fixing portion 96 is provided with a flange that is thicker than the base end (the portion around which the coil wire 34a is tyingly fixed) of the fixing portion 96. As shown in FIG. 5 , when viewed in the axial direction, at least a portion of the fixing portion 96 is formed on the surface (upper or lower surface) of the base 90 on which the fixing portion 96 is formed, approximately in the center of the width direction (left-right direction) of the antenna component 100. Specifically, when viewed in the axial direction, at least a portion of the fixing portion 96 is formed on the surface (upper or lower surface) of the base 90 on which the fixing portion 96 is formed, closer to the center in the width direction of the antenna component 100 than a turning portion 97 or a notch-forming portion 98 (described later). As a result, as shown in FIG. 5 , the fixing portion 96 does not protrude significantly radially outward from the coil 30 when viewed in the axial direction. In other words, when viewed in the axial direction, the fixing portion 96 (particularly the entire fixing portion 96) is located radially inward from the protruding portion 14. This allows the base 90 to be easily accommodated in the case 40. In this embodiment, the base 90 has two fixing portions 96, one at each of two positions facing each other across the chip capacitor, but this is not limited to this. The base 90 may also have only one fixing portion 96.

[0027] 1 , the lead-out portion 34b of the coil wire 34a drawn from the coil 30 is drawn forward along the upper or lower surface of the base 90. The lead-out portion 34b drawn to the notch-forming portion 98 turns at the notch-forming portion 98 and is drawn out so as to extend from the notch-forming portion 98 to a turning portion 97. A portion of the lead-out portion 34b extending from the notch-forming portion 98 to the turning portion 97 is electrically connected to the electrode surface of the chip capacitor 80. The end of the lead-out portion 34b extends from the turning portion 97 to a fixed portion 96, and the end of the lead-out portion 34b is entangled with the fixed portion 96.

[0028] The base 90 has a turning portion 97 that holds the coil wire 34a and a notch forming portion 98. The turning portion 97 and the notch forming portion 98 are part of the opening of the base 90 and are parts where the coil wire 34a is arranged. In this embodiment, the turning portion 97 forms an L-shaped notch when viewed in the vertical direction, and the notch forming portion 98 forms a V-shaped notch.

[0029] As shown in FIG. 6 , the case 40 accommodates at least the core 20 and the coil 30. Specifically, the case 40 accommodates at least a portion of the core 20 and at least a portion of the coil 30. In this embodiment, the case 40 accommodates the entire core 20 and the entire coil 30. The case 40 accommodating other components means that the other components (at least a portion of them) are disposed in a space formed inside the case 40. In this embodiment, the case 40 accommodates not only the core 20 and the coil 30, but also the chip capacitor 80 and the base 90. The case 40 also accommodates the protrusion 14 of the cap 10. The case 40 has a cavity therein for accommodating the core 20 and the coil 30. The case 40 in this embodiment is a member that is elongated in the front-to-rear direction, and the cavity is also elongated in the front-to-rear direction. The case 40 opens toward the rear. Therefore, the core 20, the coil 30, and the like are inserted into the cavity of the case 40 through the rear opening. The case 40 in this embodiment is made of resin. Alternatively, the case 40 may be formed of other materials, including non-metallic materials such as ceramics. In this embodiment, when the core 20 and the coil 30 are disposed inside the case 40, a gap (internal case gap 42) is generated inside the case 40. Specifically, the case 40 and the core 20 or the coil 30 are spaced apart from each other, and the internal case gap 42 exists between the case 40 and the core 20 or the coil 30. The internal case gap 42 is filled with a second adhesive 60, which will be described later.

[0030] The cap 10 is a member that covers at least a portion of the opening of the case 40. In this embodiment, the cap 10 covers the entire opening of the case 40. Alternatively, the cap 10 may cover only a portion of the opening. In this embodiment, the cap 10 is made of resin. Alternatively, the cap 10 may be made of a material other than resin (such as metal).

[0031] As described above, the cap 10 is located rearward of the core 20 and faces the core 20. Specifically, as shown in FIG. 6 , at least a portion of the cap 10 is located rearward of the entire core 20. In other words, at least a portion of the cap 10 is located rearward of the rear end of the core 20. In this embodiment, the pedestal 12, which will be described later, is located rearward of the rear end of the core 20. In other words, the pedestal 12 covers the end face 20a of the core 20 (particularly the end face 20a facing rearward). In this embodiment, the main surface 12a of the pedestal 12 is in contact with the end face 20a of the core 20. Alternatively, the main surface 12a of the pedestal 12 may be spaced apart from the end face 20a of the core 20.

[0032] As described above, the cap 10 of this embodiment includes a base portion 12 and a protrusion 14. The base portion 12 is a portion of the core 20 located rearward of the core 20. In other words, the base portion 12 is a portion covering the end face 20a (rear end face facing rearward) of the core 20. That is, at least a portion of the base portion 12 overlaps at least a portion of the end face 20a of the core 20 in the axial direction. In this embodiment, the central portion of the base portion 12 overlaps the entire end face 20a of the core 20 in the axial direction. In this embodiment, the base portion 12 is plate-shaped (more specifically, disk-shaped) with a small dimension (thickness) in the front-to-rear direction, but is not limited thereto. The shape of the base portion 12 may also be a shape that has a thickness in the front-to-rear direction. As shown in FIG. 7 , in this embodiment, the peripheral edge of the base portion 12 is located radially outward of the peripheral edge of the protrusion 14 when viewed in the axial direction. That is, the base portion 12 has a shape and dimensions that are slightly larger than those of the protruding portion 14. In other words, the base portion 12 is formed in a flange shape. As an alternative to this embodiment, the peripheral edge of the base portion 12 may coincide with the peripheral edge of the protruding portion 14 when viewed in the axial direction. That is, the base portion 12 does not have to have a flange shape.

[0033] The protrusion 14 is a portion of the cap 10 that protrudes forward from the seat 12. That is, the protrusion 14 extends from the seat 12 along the axial direction. In this embodiment, the protrusion 14 is arranged around the side surface 20b of the core 20, and the protrusion 14 covers at least a portion of the side surface 20b of the core 20. The protrusion 14 covering the side surface 20b of the core 20 means that the protrusion 14 (particularly its inner circumferential surface 14a) overlaps with the side surface 20b of the core 20 in at least one direction intersecting the axial direction (more specifically, in any radial direction excluding the ring-opening direction, which will be described later). That is, the protrusion 14 is arranged radially outward of the core 20. In this embodiment, the protrusion 14 is arranged radially outward of the side surface 20b of the core rear end 22 in only a portion of the radial direction. In other words, the protrusion 14 does not completely surround the core rear end 22 in the circumferential direction of the core 20, and a portion of the side surface of the core rear end 22 is exposed from the protrusion 14. As will be described later, in this embodiment, only one protrusion 14 protrudes from the base portion 12, and the protrusion 14 is formed in an open ring shape. Alternatively, two or more protrusions 14 arranged in the circumferential direction may protrude from the base portion 12, and the combination of the multiple protrusions 14 may cover at least a portion of the side surface of the core rear end portion 22. Alternatively to this embodiment, the protrusion 14 may extend around the core rear end portion 22 in the circumferential direction of the core 20. In other words, the protrusion 14 may be formed in a ring shape when viewed in the axial direction. In other words, the protrusion 14 may be disposed outside the side surface 20b of the core rear end portion 22 throughout the entire radial direction.

[0034] As described above, the protrusion 14 has an inner circumferential surface 14a that faces the side surface 20b of the core 20. The inner circumferential surface 14a is a portion of the surface of the protrusion 14. Specifically, the inner circumferential surface 14a is a portion of the surface of the core 20 that faces the core rear end 22. More specifically, the inner circumferential surface 14a is a portion of the surface of the core 20 that faces radially inward. The inner circumferential surface 14a facing the side surface 20b of the core 20 does not necessarily mean that the inner circumferential surface 14a and the side surface 20b of the core 20 face each other at an angle of 180 degrees. In other words, the inner circumferential surface 14a and the side surface 20b of the core 20 do not have to be arranged parallel to each other. When the inner circumferential surface 14a and the side surface 20b of the core 20 are positioned so as to form an angle of, for example, 120 degrees to 240 degrees between them, it can be said that the inner circumferential surface 14a faces the side surface 20b of the core 20.

[0035] As shown in FIGS. 7A and 7B , the protrusion 14 in this embodiment surrounds one end of the core 20 (the core rear end 22) and is formed in an open ring shape. As shown in FIG. 7B , the protrusion 14 in this embodiment has a U-shape (C-shape) when viewed in the axial direction. Here, the term "open ring" is not limited to a circular ring that opens in a predetermined direction. It also includes polygonal or irregular shapes that open in a predetermined direction when viewed in the axial direction. The open ring-shaped protrusion 14 opens in the open ring direction. Here, the open ring direction is the direction from the center of the open ring (the position where the axis of the core rear end 22 is located) toward the opening portion (referred to as the open ring portion) of the open ring-shaped protrusion 14 when viewed from above (when viewing the protrusion 14 in the axial direction). In FIG. 7B , the open ring direction is the direction from the center of the protrusion 14 toward the top in the figure. That is, in this embodiment, the protrusion 14 opens upward. The protrusion 14 (at least a part or the entire protrusion 14) defines a core accommodating portion 18. In this embodiment, the core accommodating portion 18 is a space surrounded by the open-annular protrusion 14. The rear end (core rear end 22) of the core 20 is disposed in the core accommodating portion 18. That is, a partial length of the core 20 is inserted into the core accommodating portion 18. As shown in FIG. 8 , in this embodiment, the side surface 20b of the core rear end 22 is spaced apart from the protrusion 14 (its inner circumferential surface 14a). Alternatively, the side surface 20b of the core rear end 22 may be in contact with the inner circumferential surface 14a of the protrusion 14. In this embodiment, the protrusion 14 is open in the annular-opening direction over the entire axial length of the protrusion 14. In other words, the core accommodating portion 18 within the protrusion 14 is exposed from the protrusion 14 from the base portion 12 to the protruding end of the protrusion 14. Alternatively, the protrusion 14 may be open in the annular opening direction at a portion of the protrusion 14 in the axial direction. In this case, the protrusion 14 can also be said to be open in the annular opening direction. For example, only a portion of the protrusion end side of the protrusion 14 may be open in the radial direction.In other words, the core accommodating portion 18 is covered by the protruding portion 14 located radially outside the core accommodating portion 18 at the base end side of the protruding portion 14 (the side of the base portion 12 in the axial direction), and at the protruding end side of the protruding portion 14, it may not be covered by the protruding portion 14 but may be exposed from the protruding portion 14.

[0036] In this embodiment, as described above, the protrusion 14 has a U-shape when viewed in the axial direction, and the protrusion is open in one opening direction. Alternatively, the protrusion 14 may be open in multiple opening directions. That is, the protrusion 14 may have multiple open portions.

[0037] As shown in FIG. 7B , the protrusion 14 has a recess 16 formed in the inner circumferential surface 14 a. The recess 16 is a part of the protrusion 14. Specifically, the depth direction of the recess 16 is the radial direction, and the recess 16 opens radially inward. The depth direction of the recess 16 is the direction from the opening of the recess 16 toward the interior of the recess 16. In this embodiment, the depth direction of the recess 16 is the direction from the opening of the recess 16 toward the bottom of the recess 16. In this embodiment, the recess 16 is a bottomed recess 16, but is not limited to this. The recess 16 formed in the protrusion 14 includes a through hole that penetrates the protrusion 14 in the radial direction. In this embodiment, the recess 16 is a groove that extends axially from the base end of the protrusion 14 to the protruding end of the protrusion 14. Here, the base end of the protrusion 14 is the rear end of the protrusion 14, and the protruding end of the protrusion 14 is the front end of the protrusion 14. Alternatively, the recess 16 may be formed only in a portion of the protruding portion 14 in the axial direction, and may not be formed in another portion of the protruding portion 14 in the axial direction. For example, the recess 16 may be formed only in the base end of the protruding portion 14, and may not be formed in the protruding end. Alternatively, the recess 16 may not be formed in the base end of the protruding portion 14, but may be formed in the protruding end of the protruding portion 14.

[0038] As shown in Figure 8, a first adhesive 50, which will be described later, is disposed in the recess 16. It is sufficient that the first adhesive 50 is disposed in at least a portion of the recess 16 (inside its cavity). In this embodiment, the first adhesive 50 is disposed in the entire recess 16 (inside its cavity). More specifically, the first adhesive 50 is disposed from the base end to the protruding end of the recess 16, which is a groove extending along the axial direction. Alternatively, the first adhesive 50 may be disposed only in a portion of the recess 16 (inside its cavity).

[0039] In this embodiment, as shown in FIG. 8 , the first adhesive 50 is disposed around the entire periphery of the core rear end 22. In other words, the first adhesive 50 is disposed outside the core rear end 22 in the entire radial direction. Furthermore, a portion of the first adhesive 50 disposed around the entire periphery of the core rear end 22 and a portion of the first adhesive 50 disposed in the recess 16 are adjacent to each other and integrated. Furthermore, in this embodiment, the first adhesive 50 is in close contact with the circumferential surface of the core rear end 22 over the entire circumferential direction around the entire periphery of the core rear end 22. Alternatively, the first adhesive 50 may be disposed outside the core rear end 22 only in a portion of the radial direction. That is, only a portion of the side surface 20b of the core rear end 22 may be covered with the first adhesive 50, and the other portion of the side surface 20b may be exposed from the first adhesive 50. For example, the first adhesive 50 may be disposed only in the recess 16.

[0040] The cap 10 is bonded to the core 20 by the first adhesive 50. The adhesive in this embodiment (the first adhesive 50 or the second adhesive 60 described later) is an adhesive containing a resin. The adhesive may contain other components, such as a solvent or an additive, in addition to the resin. The adhesive may also be composed of components other than the resin. The cap 10 being bonded to the core 20 by the first adhesive 50 means that the cap 10 and the core 20 maintain a desired positional relationship via the first adhesive 50. In this embodiment, the first adhesive 50 is bonded (closely attached) to each of the cap 10 and the core 20, thereby maintaining a desired positional relationship between the cap 10 and the core 20.

[0041] Because the first adhesive 50 is disposed so as to penetrate the recess 16, the first adhesive 50 is difficult to separate from the cap 10, as described above. For example, when stress is applied to the core 20 such that the core 20 is tilted relative to the axial direction, a portion of the first adhesive 50 in close contact with the core 20 penetrates the recess 16, making it difficult for the core 20 to separate from the cap 10. Specifically, when stress is applied to the central portion or front end of the core 20 in the axial direction in either the left-right or up-down direction, the side surface 20b of the core rear end 22 attempts to separate from the inner circumferential surface 14a of the protruding portion 14. However, because a portion of the first adhesive 50 in close contact with the side surface 20b of the core rear end 22 protrudes radially outward and penetrates into the recess 16, the portion of the first adhesive 50 that has penetrated into the recess 16 gets caught in the opening of the recess 16, making it difficult for the core 20 to separate from the cap 10. Furthermore, for example, when stress is applied to the core 20 so that the core 20 rotates in the circumferential direction of the core 20 and twists, a portion of the first adhesive 50 that is in close contact with the side surface 20b of the core rear end 22 protrudes radially outward and enters the recess 16, so that the portion of the first adhesive 50 that has entered the recess 16 gets caught on the opening of the recess 16. Therefore, shearing is unlikely to occur between the side surface 20b of the core rear end 22 and the first adhesive 50, and the core 20 is unlikely to separate from the cap 10.

[0042] As shown in FIG. 7B , in this embodiment, the depth of the recess 16 is smaller than the dimension of the recess 16 in the axial direction (the extension direction of the recess groove in this embodiment). The depth of the recess 16 is the radial dimension from the opening of the recess 16 to the deepest part of the recess 16 (the outermost part in the radial direction). Because the depth of the recess 16 is smaller than the dimension of the recess 16 in the axial direction, a portion of the first adhesive 50 that has entered the recess 16 is prevented from being damaged at its base end (a radially inner part) due to stress. In contrast, because the dimension of the recess 16 in the axial direction is larger than the depth of the recess 16, the first adhesive 50 can act to prevent the core 20 from separating from the cap 10 over a longer length region when stress is applied to the core 20. Alternatively, the depth of the recess 16 may be the same as or greater than the dimension of the recess 16 in the axial direction.

[0043] As shown in FIG. 7B , in this embodiment, the depth dimension of the recess 16 is smaller than the width dimension of the recess 16. The width dimension of the recess 16 is the dimension of the recess 16 in the circumferential direction of the core 20. The circumferential direction of the core 20 is the direction of rotation around the axial center of the core 20. The circumferential direction of the core 20 is also a direction perpendicular to the radial direction when viewed in the axial direction. In this embodiment, the width direction of the recess 16 is the circumferential direction of the core 20. Because the depth dimension of the recess 16 is small relative to the width dimension of the recess 16, damage to the base end (a portion of the radially inner side) of the first adhesive 50 that has entered the recess 16 due to stress is suppressed. On the other hand, because the width dimension of the recess 16 is large relative to the depth dimension of the recess 16, the portion of the first adhesive 50 that has entered the recess 16 is sufficiently thick, and therefore, when stress is applied to the core 20, the portion of the first adhesive 50 can be well caught in the recess 16. Alternatively, the depth dimension of the recess 16 may be the same as or greater than the width dimension of the recess 16 .

[0044] As shown in FIG. 6 , in this embodiment, the protruding dimension of the protruding portion 14 is larger than the dimension of the core 20 in the orthogonal axis direction (the diameter of the core 20 in this embodiment). In this embodiment, in which the recess 16 is a groove extending in the axial direction, the dimension of the recess 16 in the axial direction is larger than the dimension of the core 20 in the orthogonal axis direction. The protruding dimension of the protruding portion 14 is the dimension of the protruding portion 14 in the axial direction. Specifically, the dimension of the protruding portion 14 is the dimension in the axial direction from the main surface 12 a of the base portion 12 (the main surface 12 a facing forward) to the protruding end of the protruding portion 14. Because the protruding dimension of the protruding portion 14 is larger than the diameter of the core 20, the long core 20 can be well held in the core accommodating portion 18 of the protruding portion 14 even when stress is applied to the core 20 in any of the orthogonal axis directions (e.g., the front-rear direction or the left-right direction).

[0045] As shown in FIG. 7B , in this embodiment, the width dimension of the core accommodating portion 18 in the protruding portion 14 (in a direction perpendicular to the annular opening direction when viewed in the axial direction) increases toward the annular opening direction. In other words, the protruding portion 14 is formed so as to gradually open outward in the radial direction. That is, a portion of the inner surface 14d defining the core accommodating portion 18 is inclined with respect to the annular opening direction. In this embodiment, the width direction of the core accommodating portion 18 gradually increases toward the annular opening direction. Alternatively, the inner surface 14d may be formed in a stepped shape, so that the width direction of the core accommodating portion 18 increases in stages toward the annular opening direction. In this embodiment, the inner surface 14d defining the core accommodating portion 18 includes the inner circumferential surface 14a. In this embodiment, the portion of the inner surface 14d defining the core accommodating portion 18 in the annular opening portion of the protruding portion 14 is continuously connected to the inner circumferential surface 14a without any steps. The protrusion 14 having the above-described shape can prevent shearing between the first adhesive 50 or the second adhesive 60 and the protrusion 14 (i.e., the protrusion 14 from peeling off from the first adhesive 50 or the second adhesive 60 at the interface between the protrusion 14 and the first adhesive 50 or the second adhesive 60) when stress is applied to the core 20 so as to tilt the core 20 relative to the axial direction. Specifically, when stress is applied to the core 20 inside the protrusion 14 that opens in the ring-opening direction in the direction toward or opposite to the ring-opening direction, the core 20 may move inside the core accommodating portion 18 of the protrusion 14, and shearing may occur between the first adhesive 50 or the second adhesive 60 and the inner circumferential surface 14a of the protrusion 14. This is because the core rear end 22 tends to shift in the ring-opening direction (upward in FIG. 8 ) inside the core accommodating portion 18. At this time, because a portion of the inner circumferential surface 14a defining the core accommodating portion 18 is inclined with respect to the ring-opening direction, the occurrence of shearing between the first adhesive 50 or the second adhesive 60 and the inner circumferential surface 14a of the protruding portion 14 is suppressed compared to when a portion of the inner circumferential surface 14a is parallel to the ring-opening direction. For example, when the core 20 is biased so that the core rear end portion 22 is displaced in the direction opposite to the ring-opening direction, part of the load of the core 20 is pressed against the inner surface 14d, and the shear force that shears between the adhesive (first adhesive 50 or second adhesive 60) and the protruding portion 14 is reduced.When the core 20 is biased so that the core rear end 22 shifts in the ring-opening direction, part of the load of the core 20 acts as a force to peel the adhesive from the inner surface 14d in the direction perpendicular to the inner surface 14d, thereby reducing the shear force.

[0046] As shown in FIG. 7( b ), in this embodiment, the recess 16 is recessed from the inner circumferential surface 14 a with its depth direction intersecting the ring-opening direction of the protrusion 14. Specifically, when viewed in the axial direction, the recess 16 is recessed from the inner circumferential surface 14 a with its depth direction intersecting the ring-opening direction. In other words, the depth direction of the recess 16 does not point upward or downward in FIG. 7( b ). In this embodiment, because the protrusion 14 opens in the ring-opening direction, the core 20 is likely to separate from the cap 10 in the ring-opening direction. Specifically, when upward or downward stress is applied to the core 20 (particularly its central portion or front end portion), the core rear end 22 may shift upward (the core rear end 22 may shift in the ring-opening direction within the core accommodating portion 18). Because the depth direction of the recess 16 intersects the ring-opening direction of the protrusion 14, a portion of the first adhesive 50 that has penetrated into the recess 16 extends in a direction intersecting the ring-opening direction. Therefore, even if the core rear end 22 attempts to move in the ring-opening direction, the portion of the first adhesive 50 gets caught in the opening of the recess 16, preventing the core rear end 22 from shifting within the core accommodating portion 18. As a result, the core 20 is less likely to separate from the cap 10. In this embodiment, multiple (two) recesses 16 are formed in the protruding portion 14. It is sufficient that some of the multiple recesses 16 are recessed with their depth direction intersecting the ring-opening direction of the protruding portion 14. Preferably, as in this embodiment, all of the multiple recesses 16 are recessed with their depth direction intersecting the ring-opening direction of the protruding portion 14. Alternatively, all or some of one or more recesses 16 may be recessed from the inner circumferential surface 14a with their depth direction equal to the ring-opening direction.

[0047] The depth direction of the recess 16 includes a component opposite to the ring-opening direction (reverse ring-opening direction). In this embodiment, the reverse ring-opening direction is downward in FIG. 7B . This allows the entire recess 16 in the width direction to be close to the side surface 20b of the core 20. That is, the entire opening of the recess 16 in the width direction is arranged along the side surface 20b of the core 20. In other words, the base end of the portion of the first adhesive 50 that has entered the recess 16 is close to the side surface 20b of the core 20 from one end to the other in the width direction. This makes it difficult for the portion of the first adhesive 50 that has entered the recess 16 to peel off or separate from the side surface 20b of the core 20, and the first adhesive 50 effectively bonds the core 20 to the cap 10. Furthermore, during the manufacture of the antenna component 100, the cap 10 may be positioned so that the ring-opening direction is vertically upward, and the core 20 may be inserted into the core accommodating portion 18 from top to bottom. In this case, the first adhesive 50 is poured into the recess 16 before the core 20 is inserted into the core accommodating portion 18. At this time, since the depth direction of the recess 16 contains a reverse ring-opening component, the first adhesive 50 easily flows into the recess 16 due to its own weight.

[0048] As described above, instead of the protrusion 14 being open in one ring-opening direction, the protrusion 14 may be open in multiple ring-opening directions. In this case, it is sufficient that the depth direction of at least one recess 16 includes a component opposite to at least one ring-opening direction. Alternatively, it is sufficient that all recesses 16 include a component opposite to at least one of the multiple ring-opening directions.

[0049] In this embodiment, the depth direction of the recess 16, as viewed in the axial direction, includes a larger reverse-opening component than the directional component perpendicular to the annular-opening direction. That is, as shown in FIG. 7B , the depth direction of the recess 16 has a larger downward component than the directional component perpendicular to the annular-opening direction. This more effectively achieves the effect of the first adhesive 50 adhering the core 20 to the cap 10 as described above. Alternatively, in this embodiment, the depth direction of the recess 16, as viewed in the axial direction, may include a reverse-opening component equal to the directional component perpendicular to the annular-opening direction, or may include a reverse-opening component smaller than the directional component perpendicular to the annular-opening direction.

[0050] As shown in FIG. 7B , in this embodiment, the recess 16 is not formed in a portion of the inner circumferential surface 14 a facing the ring-opening direction. That is, the portion of the inner circumferential surface 14 a facing upward is the non-recess 16 region 14 e. In other words, the portion of the inner circumferential surface 14 a facing 180 degrees to the ring-opening portion of the protrusion 14 is the non-recess 16 region 14 e. This non-recess 16 region protrudes radially inward from the recess 16 (particularly its bottom). As a result, even if stress is applied to the core 20 such that the core rear end 22 shifts in the ring-opening direction, the first adhesive 50 makes it more difficult for the core 20 to separate from the cap 10 compared to a case in which the recess 16 is formed in the non-recess 16 region (i.e., a recess 16 recessed in the direction opposite to the ring-opening direction is formed). Instead of this embodiment, the recess 16 may be formed in a portion of the inner circumferential surface 14 a facing the ring-opening direction. For example, a recess 16 may be formed in the part, and the two recesses 16 in this embodiment may be connected to one another. Alternatively, one recess 16 may be formed in the part.

[0051] When the protrusion 14 is open in multiple ring-opening directions, it is sufficient that the recesses 16 are not formed in a portion of the inner circumferential surface 14a facing at least one of the ring-opening directions. Preferably, the recesses 16 are not formed in a portion of the inner circumferential surface 14a facing each of the multiple ring-opening directions. In other words, all portions of the inner circumferential surface 14a facing any of the ring-opening directions are regions where the recesses 16 are not formed.

[0052] In this embodiment, the two recesses 16 are formed in line-symmetric positions when viewed in the axial direction. More specifically, the two recesses 16 are formed in line-symmetric positions about a straight line (dashed line in FIG. 7( b)) extending in the annular opening direction (up and down direction). This straight line passes through the axis of the core 20 when the core 20 is placed in the core accommodating portion 18. The two recesses 16 are recessed toward the left or right, respectively, in the drawing. In this embodiment, the region of the inner circumferential surface 14 a sandwiched between the two recesses 16 formed in line-symmetric positions is a recess-16-free region 14 e.

[0053] As shown in FIGS. 8 and 9 , the first adhesive 50 is disposed on the inner edge 18a of the core accommodating portion 18. The inner edge 18a is a portion of the inner side of the core accommodating portion 18 in the annular-opening direction. Specifically, a portion of the first adhesive 50 (second portion 52) is disposed so as to cover the outer side of the side surface 20b of the core rear end portion 22 in the annular-opening direction. Also, as described above, a portion of the first adhesive 50 (first portion 51) is disposed in the recess 16. The second adhesive 60 is disposed on the outer edge 18b of the core accommodating portion 18. The outer edge 18b is a portion of the core accommodating portion 18 that is outer than the first adhesive 50 in the annular-opening direction. In other words, the outer edge 18b is a portion of the core accommodating portion 18 that is outer than the inner edge 18a in the annular-opening direction. That is, at least a portion of the second adhesive 60 covers the radially outer side (outer side in the annular-opening direction) of a portion of the first adhesive 50 (second portion 52). The second adhesive 60 is an adhesive having a different composition from the first adhesive 50. The first adhesive 50 is harder than the second adhesive 60. In other words, the second adhesive 60 is softer than the first adhesive 50. That is, when a predetermined stress is applied to the first adhesive 50 or the second adhesive 60, the first adhesive 50 is less likely to deform than the second adhesive 60, and the second adhesive 60 is more likely to deform than the first adhesive 50. The hardness of the first adhesive 50, which is disposed around the core 20 and bonds the core 20 and the cap 10, allows the desired positional relationship between the core 20 and the cap 10 to be better maintained. On the other hand, the soft second adhesive 60 is disposed outside the first adhesive 50 (particularly outside the ring-opening direction). Therefore, even if stress is applied to the core 20 and causes the core rear end 22 to shift in the ring-opening direction, the second adhesive 60 can deform slightly and absorb the stress. This prevents the core 20 and the cap 10 from separating, or prevents damage to the core 20 or the cap 10.

[0054] As shown in FIG. 8 , in this embodiment, the second adhesive 60 is filled from the outer surface of the first adhesive 50 to the periphery of the protrusion 14 (the open portion of the open-annular protrusion 14). As shown in FIG. 9 , a portion of the surface of the second adhesive 60 facing radially outward contacts the inner wall of the case 40. Furthermore, the second adhesive 60 of this embodiment fills the gap 42 within the case. That is, the second adhesive 60 is disposed between the inner wall of the case 40 and the circumferential surface of the coil 30, between the inner wall of the case 40 and the base 90 or the chip capacitor 80, and between the inner wall of the case 40 and the cap 10. The second adhesive 60 is in close contact with the inner wall of the case 40, the circumferential surface of the coil 30, the surface of the base 90 or the chip capacitor 80, and the surface of the cap 10. In this embodiment, the second adhesive 60 is in close contact with the inner wall of the case 40 and the cap 10 (particularly the main surface 12 a of the base 12 or the protrusion 14), thereby adhering the case 40 and the cap 10.

[0055] 8, in this embodiment, the radial dimension of the second adhesive 60 arranged in the core accommodating portion 18 is larger than the radial dimension of the second portion 52. This allows the second adhesive 60 to effectively absorb stress on the core 20, as described above.

[0056] As shown in FIG. 8 , in this embodiment, a portion of the first adhesive 50 (first portion 51) that has entered the recess 16 and a portion of the first adhesive 50 (second portion 52) that covers the outer side of the core rear end 22 in the ring-opening direction are integrally formed. That is, the first adhesive 50 covers the entire periphery of the side surface 20b of the core rear end 22, and the first portion 51 and the second portion 52 are integrally formed via the portion of the first adhesive 50 that covers the periphery of the side surface 20b. In this way, the first adhesive 50 covers the entire periphery of the core rear end 22 in the circumferential direction, and the first portion 51 and the second portion 52 are integrally formed, making it more difficult for the cap 10 and the core 20 to separate due to the first adhesive 50. Specifically, even if stress is applied to the core 20 and the core rear end 22 attempts to shift in the ring-opening direction, when the core rear end 22 applies stress to the first adhesive 50 (particularly the second portion 52) in the ring-opening direction, the entire first adhesive 50, including the first portion 51, is pulled in the ring-opening direction. As a result, the first portion 51 is caught in the opening of the recess 16, making it more difficult for the cap 10 and the core 20 to separate from each other.

[0057] 8 , the first portion 51 and the second portion 52 protrude radially outward relative to other portions of the first adhesive 50. For example, the first portion 51 and the second portion 52 protrude radially outward relative to a portion of the first adhesive 50 located near the non-forming region 14 e (the first adhesive 50 covering a portion of the side surface 20 b of the core rear end portion 22 facing in the opposite direction to the ring-opening direction). Here, the phrase "a portion of the first adhesive 50 protruding relative to other portions of the first adhesive 50" means that the radial dimension of the portion, based on the side surface 20 b of the core 20, is larger than the radial dimension of the other portion. In this way, because not only the first portion 51 but also the second portion 52 protrude radially outward, the second portion 52 also makes it difficult for the core 20 to separate from the cap 10 when stress is applied to the core 20. That is, even when stress is applied to the core 20 so that the core 20 is tilted relative to the axial direction, or even when stress is applied to the core 20 so that the core 20 is twisted, the second portion 52 gets caught on the open portion of the protrusion 14, making it difficult for the core 20 to separate from the cap 10. In addition, in this embodiment, the two first portions 51 and one second portion 52 are disposed at positions that are opposed to each other by approximately 120 degrees.

[0058] 8 , the protruding dimension of the second portion 52 (the radial dimension of the second portion 52) may be smaller than the protruding dimension of the first portion 51 (the radial dimension of the first portion 51). By reducing the protruding dimension of the second portion 52, the thickness dimension (radial dimension) of the second adhesive 60 can be sufficiently ensured, allowing the second adhesive 60 to sufficiently absorb stress on the core 20. Furthermore, since the first portion 51 protrudes with a sufficient protruding dimension compared to the second portion 52, the first portion 51 can be effectively caught in the opening of the recess 16, effectively preventing the core 20 from separating from the cap 10. Alternatively, the protruding dimension of the first portion 51 may be smaller than the protruding dimension of the second portion 52.

[0059] 8 , the width dimension of the second portion 52 (the dimension of the second portion 52 in the circumferential direction) may be larger than the width dimension of the first portion 51 (the dimension of the first portion 51 in the circumferential direction). This effectively achieves the effect that the second portion 52 makes it difficult for the core 20 to separate from the cap 10, even if the protruding dimension of the second portion 52 is smaller than the protruding dimension of the first portion 51. Alternatively, the width dimension of the second portion 52 may be smaller than the width dimension of the first portion 51.

[0060] In this embodiment, as shown in FIG. 9 , the protruding portion 14 has a flat protruding surface 14b. The protruding surface 14b is a surface located at the protruding end of the protruding portion 14 and is a protruding end surface. In this embodiment, the protruding surface 14b extends in a direction perpendicular to the axial direction. Note that in FIG. 9 , the antenna component 100 is illustrated so that the diameter of the core 20 is small, for the convenience of explaining the characteristics of the hollow portion 70 and the first adhesive 50, which will be described later. The protruding portion 14 also has an intermediate surface 14c. The intermediate surface 14c is a surface that continues from the inner circumferential surface 14a to the protruding surface 14b, i.e., a surface located between the inner circumferential surface 14a and the protruding surface 14b. In this embodiment, the boundaries between the protruding surface 14b and the intermediate surface 14c and between the intermediate surface 14c and the inner circumferential surface 14a have corners. Alternatively, the boundaries between the protruding surface 14b and the intermediate surface 14c and between the intermediate surface 14c and the inner circumferential surface 14a may be smoothly continuous. The intermediate surface 14c extends in a direction intersecting the axial direction. Specifically, the intermediate surface 14c extends in a direction having a radial component and an axial component. In this embodiment, the radial component of the extending direction of the intermediate surface 14c is equal to the axial component of the extending direction of the intermediate surface 14c. More specifically, as shown in FIG. 7A, the core accommodating portion 18 of the protruding portion 14 (particularly, the space in which the core 20 is disposed) is formed to widen toward the front. In other words, the dimension of the core accommodating portion 18 of the protruding portion 14 (particularly, the space in which the core 20 is disposed) in the direction intersecting the axial direction gradually increases toward the front. As shown in FIG. 9, a hollow portion 70 exists between the intermediate surface 14c of the protruding portion 14 and the side surface 20b of the core 20. More specifically, the hollow portion 70 exists between the intermediate surface 14c and the side surface 20b in the direction intersecting the axial direction (more specifically, the radial direction). The hollow portion 70 communicates with the recessed portion 16. Here, the phrase "the hollow portion 70 communicates with the recessed portion 16" means that the hollow portion 70 and the recessed portion 16 are adjacent to each other when the cap 10 is viewed alone, regardless of whether the hollow portion 70 or the recessed portion 16 is filled with the first adhesive 50.By forming the hollow portion 70 communicating with the recess 16 in this manner, even if the cap 10 is filled with an amount of first adhesive 50 that overflows from the recess 16, the first adhesive 50 that overflows from the recess 16 can accumulate in the hollow portion 70. In particular, for example, in the manufacturing process of the antenna component 100, there is a case where the cap 10 (particularly the recess 16) is filled with the first adhesive 50 and then the core 20 is inserted into the core accommodating portion 18. In this case, the first adhesive 50 that was previously filled may be pushed out of the core accommodating portion 18 by the core 20, but the pushed-out first adhesive 50 can accumulate in the hollow portion 70.

[0061] 9, the first adhesive 50 is disposed in the hollow portion 70. In other words, the first adhesive 50 is disposed between the side surface 20b and the intermediate surface 14c of the core 20. As a result, even if stress is applied to the core 20 so as to tilt it in the axial direction, the core 20 (particularly a portion near the protruding end) is pressed not against the protruding portion 14 but against the first adhesive 50 disposed in the hollow portion 70, which is softer than the protruding portion 14. This prevents the core 20 from being accidentally damaged or deformed.

[0062] In this embodiment, the intermediate surface 14c is a flat surface formed by C-chamfering a portion of the radially inner side at the protruding end of the protruding portion 14. This allows the hollow portion 70 to have a sufficient volume compared to when the intermediate surface 14c is a convex spherical surface formed by R-chamfering a portion of the radially inner side at the protruding end of the protruding portion 14. Alternatively, the intermediate surface 14c may be a concave spherical surface recessed toward the inside of the protruding portion 14.

[0063] (Cap Component) The cap 10 of this embodiment may be provided as a standalone cap component 10. The cap component 10 of this embodiment (the cap 10 described above) is attached to one end of an elongated core 20 with an adhesive (first adhesive 50). The cap component 10 has a space (core accommodating portion 18 in this embodiment) in which the core rear end 22 is disposed when one end of the core 20 (core rear end 22) is attached to the cap component 10. In this embodiment, the space is the core accommodating portion 18 in the open-annular (U-shaped) protruding portion 14, but is not limited thereto. The space may be a space partially defined by the main surface of the base portion 12 and the inner circumferential surface 14a of the protruding portion 14, and need not be entirely defined by the base portion 12 or the protruding portion 14. For example, when the core rear end 22 is disposed in the space, most of the side surface of the core rear end 22 may be exposed from the protruding portion 14. In other words, when the core rear end 22 is disposed in the space, the protrusion 14 only needs to cover a portion of the side surface of the core rear end 22 in the radial direction. The cap component 10 has a base 12 and a protrusion 14. The base 12 has a main surface 12a. When one end (core rear end 22) of the core 20 is inserted into the space (core accommodating portion 18), the main surface 12a faces an end face 20a of the core 20. The protrusion 14 protrudes from the base 12 in a direction intersecting the main surface 12a of the base 12. The protrusion 14 has an inner circumferential surface 14a that defines the space (core accommodating portion 18). The protrusion 14 has a recess 16 that opens at the inner circumferential surface 14a. By manufacturing the antenna component 100 using the cap component 10 having the above-described structure, it is possible to provide the antenna component 100 in which the long core can be favorably bonded to the cap component 10 with an adhesive.

[0064] The present invention is not limited to the above-described embodiment, but includes various modifications and improvements as long as the object of the present invention is achieved.

[0065] The above embodiments encompass the following technical concepts: (1) An antenna component comprising: a core that is elongated in an axial direction and has an end face facing the axial direction and a side face facing a direction intersecting the axial direction; a coil that is spirally formed around the core; a case that houses the core and the coil and opens to one side in the axial direction; and a cap that is located on the one side of the core and is bonded to the core with a first adhesive, wherein the cap includes: a base that is located on the one side of the core; and a protruding portion that protrudes from the base toward the other side opposite to the one side in the axial direction and covers the side face, the protruding portion having an inner circumferential surface that faces the side face, and a recess that opens to the inner circumferential surface is formed in the protruding portion, and the first adhesive is disposed in the recess. (1-1) The antenna component described in (1), wherein a dimension of the recess in a radial direction from the axial center of the core toward the side face of the core is smaller than a dimension of the recess in the axial direction. (1-2) The antenna component according to (1), wherein the dimension of the recess in the radial direction from the axial center of the core toward the side surface of the core is smaller than the dimension of the recess in the circumferential direction of the core. (1-3) The antenna component according to (1), wherein the dimension of the protrusion in the axial direction is larger than the dimension of the core in the axis-orthogonal direction perpendicular to the axial direction. (1-4) The antenna component according to (1), wherein the protrusion is formed in an open ring shape surrounding one end of the core and opening in the ring-opening direction, defining a core accommodating section in which the one end is disposed, and the dimension of the core accommodating section in the direction perpendicular to the ring-opening direction as viewed in the axial direction increases toward the ring-opening direction. (2) The antenna component according to (1), wherein the protrusion is formed in an open ring shape surrounding one end of the core and opening in the ring-opening direction, defining a core accommodating section in which the one end is disposed, and the recess is recessed from the inner circumferential surface with a depth direction that intersects with the ring-opening direction of the protrusion. (3) The antenna component according to (2), wherein the depth direction of the recess includes a component opposite to the annular opening direction. (3-1) The antenna component according to (3), wherein the depth direction of the recess includes a component opposite to the annular opening direction, the component being greater than a component perpendicular to the annular opening direction, as viewed in the axial direction.(4) The antenna component according to (3), wherein the recess is not formed in a portion of the inner circumferential surface facing the ring-opening direction. (5) The antenna component according to any one of (2) to (4), wherein the first adhesive is disposed in a portion of the core accommodating portion that is inner in the ring-opening direction and in the recess, and a second adhesive, which is an adhesive having a different composition from the first adhesive, is disposed in a portion of the core accommodating portion that is outer in the ring-opening direction than the first adhesive, and the first adhesive is harder than the second adhesive. (5-1) The antenna component according to (5), wherein the dimension of the second adhesive disposed in the core accommodating portion in the radial direction is larger than the dimension in the radial direction of the first adhesive disposed so as to cover the outer side surface of the core in the ring-opening direction. (5-2) The antenna component according to (5), wherein the protruding dimension of the second portion is smaller than the protruding dimension of the first portion. (5-3) The antenna component according to (5) or (5-2), wherein the width dimension of the second portion is larger than the width dimension of the first portion. (6) The antenna component according to any one of claims (1) to (5), wherein the protruding portion has a flat protruding surface, the protruding portion has an intermediate surface that continues from the inner peripheral surface to the protruding surface and extends in a direction intersecting the axial direction, and a hollow portion that communicates with the recess is present between the intermediate surface and the side surface. (6-1) The antenna component according to (6), wherein a first adhesive is disposed in the hollow portion or the hollow portion is filled with the first adhesive. (7) A cap component that is attached to one end of a long core with an adhesive, the cap component having: a space in which the one end is disposed when the one end is attached to the cap component; a base portion having a main surface that faces an end face of the core when the one end is inserted into the space; and a protruding portion that protrudes from the base portion in a direction intersecting the main surface, the protruding portion having an inner peripheral surface that defines the space, and a recess that opens into the inner peripheral surface is formed in the protruding portion.

[0066] 100 Antenna component 10 Cap component, cap 12 Base portion 12a Main surface 14 Protruding portion 14a Inner peripheral surface 14b Protruding surface 14c Middle surface 14d Inner surface 14e Non-forming region 16 Recessed portion 18 Core accommodating portion 18a Inner edge portion 18b Outer edge portion 20 Core 20a End surface 20b Side surface 22 Core rear end portion 30 Coil 34a Coil wire 34b Lead-out portion 40 Case 42 Gap within case 50 First adhesive 51 First part 52 Second part 60 Second adhesive 70 Hollow portion 80 Chip capacitor 90 Base 92 Accommodating recess 94 Core accommodating recess 96 Fixing portion 97 Turning portion 98 Notch forming portion

Claims

1. An antenna component comprising: a core that is elongated in an axial direction and has an end face facing the axial direction and a side face facing a direction intersecting the axial direction; a coil that is spirally formed around the core; a case that houses the core and the coil and opens to one side in the axial direction; and a cap that is located on the one side of the core and is adhered to the core with a first adhesive that is an adhesive, wherein the cap includes: a base portion that is located on the one side of the core; and a protruding portion that protrudes from the base portion toward the other side opposite the one side in the axial direction and covers the side face, wherein the protruding portion has an inner surface that faces the side face, and a recess that opens to the inner surface is formed in the protruding portion, and the first adhesive is disposed in the recess.

2. An antenna component as described in claim 1, wherein the protrusion is formed in an open ring shape surrounding one end of the core and opening in the ring-opening direction, defining a core accommodating section in which the one end is disposed, and the recess is recessed from the inner peripheral surface with a depth direction that intersects with the ring-opening direction of the protrusion.

3. The antenna component according to claim 2, wherein the depth direction of the recess includes a component in the direction opposite to the ring-opening direction.

4. The antenna component according to claim 3, wherein the recess is not formed in a part of the inner peripheral surface facing the annular opening direction.

5. An antenna component as described in any one of claims 2 to 4, wherein the first adhesive is disposed in a portion of the core accommodating section that is on the inside in the ring-opening direction and in the recess, and a second adhesive, which is an adhesive having a different composition from the first adhesive, is disposed in a portion of the core accommodating section that is on the outside in the ring-opening direction of the first adhesive, and the first adhesive is harder than the second adhesive.

6. An antenna component according to any one of claims 1 to 5, wherein the protruding portion has a flat protruding surface, the protruding portion has an intermediate surface that continues from the inner peripheral surface to the protruding surface and extends in a direction intersecting the axial direction, and a hollow portion that communicates with the recess exists between the intermediate surface and the side surface.

7. A cap part attached to one end of a long core with an adhesive, the cap part having a space in which the one end is placed when attached to the cap part, a base part having a main surface that faces the end face of the core when the one end is inserted into the space, and a protruding part that protrudes from the base part in a direction intersecting with the main surface, the protruding part having an inner circumferential surface that defines the space, and the protruding part having a recess that opens into the inner circumferential surface.

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