Patent Application
20190115663
The present invention relates to an antenna device and a method for manufacturing an antenna device.
In the recent years, smart key systems have become quite popular in vehicles and homes. A smart key system wirelessly transmits and receives information that relates to, for example, an ID code as an electromagnetic wave. When such an ID code is collated, an owner can perform operations, for instance, to lock and unlock a door of such a vehicle or house, or to start and stop the engine without using a mechanical key. In the smart key system mentioned above, an antenna device, which has a coil antenna to transmit and receive the information, is used.
As an antenna device explained above, for instance, related technologies are disclosed in Japanese Patent Number 5050223. The antenna device that is disclosed in this Japanese Patent is configured with a first magnetic substance core, a first coil, a second magnetic substance core, and a second coil.
The first magnetic substance core is in a flat rod (bar) (rectangular bar) shape. Further, the first coil is located at an outer circumferential side of the first magnetic substance core, and one end of the first coil is connected to a first terminal. The second magnetic substance core has a toroidal closed magnetic path structure and has a configuration in which though magnetic saturation occurs at the time of the transmission of a signal radio wave, the magnetic saturation does not occur at the time of the reception of the signal radio wave. Further, the second coil is wound around the second magnetic substance core. One end of the second coil is connected to the other end of the first coil, and the other end of the second coil is connected to a second terminal.
In the configuration disclosed in Japanese Patent Number 5050223, a special magnetic substance core that is the second magnetic substance core is used, and at the same time, the second coil that is wound around the second magnetic substance core is used. As a result, a resonance frequency is adjusted. Therefore, this construction has the possibility of being complicated.
Further, in an LC (an inductor and a capacitor) resonant circuit, because a resonance frequency is defined within a narrow range, the mathematical product (L*C) of L and C (an inductor and a capacitor) can also be changed only within a narrow range. On the other hand, in regards to the first coil, a part, in which a wire is densely wound, exists. However, in that densely wound part, a change of an inductance value L per one turn can be, for instance, about 10 pH. Further, in general, a capacitor that is used in a resonant circuit also has a characteristic variation (as an example, ±5%) during manufacturing. As a result, it may become desirable to adjust an inductance value L of the first coil every 1 pH, however, this adjustment is difficult. Therefore, it becomes difficult to absorb the variation of the electrostatic capacity value C, and the variation of the product of the inductance value L and the electrostatic capacity value C, which is needed when a resonance frequency is obtained, is suppressed within a resonance range.
The present invention attempts to solve these problems. An object of the present invention is to provide an antenna device and a method for manufacturing an antenna device that enable an inductance value to be easily adjusted within a narrow tolerance range in spite of a simple structure.
In order to achieve the above object, an antenna device according to one aspect of the present invention includes: a core that is formed with a magnetic material; a bobbin member that is provided at an outer circumferential side of the core, that has first and second bobbin sides opposite to each other, and that has a partition at a position located between the first and second bobbin sides; and a coil that is provided by winding a wire around the bobbin member. The coil is configured with a tight winding portion and a loose winding portion. The tight winding portion is provided around a first area of the bobbin located between the first bobbin side and the partition. The loose winding portion is provided around a second area of the bobbin located between the second bobbin side and the partition. A wiring density of the tight winding portion in which the wire is densely wound is larger than a wiring density of the loose winding portion in which the wire is loosely wound. The loose winding portion is configured with a first winding layer and a second winding layer which is formed on the first winding layer at a first part of the bobbin member. A wire winding direction of the first winding layer is opposite to a wire winding direction of the second winding layer so that the wire of the first winding layer and the wire of the second winding layer cross each other and overlap each other at the first part of the bobbin member.
An antenna device according to another aspect of the present invention further includes a terminal attachment part, to which a terminal is attachable, that is provided at one of the first bobbin side and the second bobbin side. The terminal attachment part is provided at the first bobbin side so that the tight winding portion is located closer to the terminal mounting part than the loose winding portion.
In an antenna device according to another aspect of the present invention, the wire of the first winding layer and the wire of the second winding layer are provided in a single layer along a second part of the bobbin member.
In an antenna device according to another aspect of the present invention, the bobbin member is longitudinally extended in a longitudinal direction. Both the wire of the first winding layer and the wire of the second winding layer cross a width direction perpendicular to the longitudinal direction at an angle of 3° to 177°.
In an antenna device according to another aspect of the present invention, a length of the loose winding portion in the longitudinal direction is equal to or longer than a length of the tight winding portion in the longitudinal direction.
In an antenna device according to another aspect of the present invention, a first wound wire pitch (internal) between first adjacent turns of the wire of the loose winding portion closest to the first bobbin side is different from a second wound wire pitch between second adjacent turns of the wire of the loose winding portion closest to the second bobbin side. Alternatively, the first wound wire pitch between first adjacent turns of the wire of the loose wound portion closest to the first bobbin side is longer than the second wound wire pitch between second adjacent turns of the wire of the loose wound portion closest to the second bobbin side.
In a method for manufacturing an antenna device according to another aspect of the present invention, the antenna device has: a core that is formed with a magnetic material; a bobbin member that has a core insertion part (core sleeve, core pocket, or core housing) in which of the core is provided, that has first and second bobbin sides opposite to each other, and that has a partition at a position located between the first and second bobbin sides; and a coil that is provided by winding a wire around the bobbin member. The method includes: inserting the core into the core insertion part of the bobbin; and forming the coil by winding the wire around the bobbin member. The winding includes: densely winding the wire around a first area of the bobbin located between the first bobbin side and the partition so as to form a tight would portion; and loosely winding the wire around a second part of the bobbin located between the second bobbin side and the partition so as to form a loose would portion. The loosely winding includes: forming a first winding layer by winding the wire in a first wire winding direction; and after the first winding layer is formed, forming a second winding layer by winding the wire in a second wire winding direction opposite to the first wire winding direction on the first wire at a first part of the bobbin member so that the wire of the first layer and the wire of the second layer cross each other.
In a method for manufacturing an antenna device according to another aspect of the present invention, the wire of the first winding layer and the wire of the second winding layer are provided in a single layer along a second part of the bobbin member.
In a method for manufacturing an antenna device according to another aspect of the present invention, the bobbin member is longitudinally extended in a longitudinal direction. Both the wire of the first winding layer and the wire of the second winding layer cross a width direction perpendicular to the longitudinal direction at an angle of 3° to 177°. Further, a length of the loose winding portion in the longitudinal direction is equal to or longer than a length of the tight winding portion in the longitudinal direction. A first wound wire pitch (interval) between first adjacent turns of the wire of the loose winding portion closest to the first bobbin side is different from (or longer than) a second wound wire pitch between second adjacent turns of the wire of the loose winding portion closest to the second bobbin side.
According to the above aspects of the present invention, it is possible to provide an antenna device that enables an inductance value to be easily adjusted in spite of the simple structure.
An antenna device 10A according to a first embodiment of the present invention will be explained below with reference to the drawings.
Further, an XYZ orthogonal coordinate system can be used in the following embodiments. Specifically, an X-direction is defined to be a longitudinal direction of the antenna device 10A. An X1 side is defined to be a side in which a connector connection part 40A being explained below is located, and an X2 side is opposite of this X1 side. Further, a Z-direction is defined to be a thickness direction of the antenna device 10A. A Z1 side is defined to be an upper side in
Overall Configuration of Antenna Device 10A
As shown in
Further, as shown in
The winding frame part 32A can have a cylindrical shape, however, in the first embodiment of the present invention, the winding frame part 32A has a shape of being suitably (partially) punched through. Specifically, as shown in
Further, the partition 33A is provided at the bobbin part 31A. The partition 33A is used for partitioning a tight winding portion 53A (tight-coil winding portion, fine winding portion or densely winding portion) and a loose winding portion 54A (loose-coil winding portion, rough winding portion or coarse winding portion) of the coil 50A. In the configuration shown in
Further, the core insertion part 34A corresponds to a hole-like part (opening or slot) that penetrates the bobbin part 31A in the longitudinal direction (the X-direction) and is also the part through which the core 20A is inserted. On an inner wall side of the sidewall part 32A1 facing the core insertion part 34A, a core holding projection 32A6 contacting the core 20A is provided. Any number of core holding projections 32A6 can be provided, however, in the configuration shown in
Further, the connection terminal 60A (refer to
Further, a barrier wall 35A2 is provided at the other end side (the X2 side) of the terminal mounting part 35A in order to separate the terminal mounting part 35A from the core insertion part 34A. Thus, because one end of the core 20A runs against the barrier wall 35A2, the core 20A is positioned within the core insertion part 34A.
As a configuration of the terminal mounting part 35A, a substrate on which, for instance, a capacitor or a resistor is mounted can also be attached to the terminal mounting part 35A. When the substrate is attached, a part of the connection terminal 60A such as the entwining part 62A penetrates the substrate and the soldering is performed at the penetrated part. As a result, a conductor pattern of the substrate and the connection terminal 60A are electrically connected. Further, when the substrate is attached to the terminal mounting part 35A, it is preferred that a configuration in which the substrate fits into or interlocks with the terminal mounting part 35A is adopted.
Further, the connector connection part 40A is continuously provided at the terminal mounting part 35A. In the first embodiment of the present invention, the connector connection part 40A is provided along a width direction (the Y-direction) perpendicular to the longitudinal direction (the X-direction) at a right angle. This connector connection part 40A has a bottomed connector hole (e.g., a blind bore, not shown) and one end side (the Y1 side) of this connector hole is partitioned by a partition wall part 41A.
As shown in
Further, an external connector that is inserted into this connector hole is electrically connected to the connection terminal 60A that projects into the inside of the connector hole. As a result, an electric current can flow in the coil 50A explained below.
Next, the coil 50A will be explained.
In the configuration shown in
Further, a locking member for preventing a position shift and for supporting the wire 51A can also be adopted on the other side (the X2 side) of the winding frame part 32A. Because the wire 51A is locked on the other side (the X2 side) of the winding frame part 32A by this locking member, the wire 51A of the lower layer (the first layer) and the wire 51A of the upper layer (the second layer) can excellently cross (intersect) each other. Further, each of the wire 51A of the lower layer (the first layer) and the wire 51A of the upper layer (the second layer) can cross the width direction (the Y-direction) at an angle range of 3 degrees (3°) to 177 degrees (177°). Specifically, the width direction (the Y-direction) is perpendicular to the longitudinal direction (the X-direction) of the bobbin member 30A at right angles. In this angle range, it is possible to prevent the wire 51A of the upper layer (the second layer) from being in a state in which it remains fallen into a recess made between the adjacent turns of the wire 51A of the lower layer (the first layer). As a result, the inductance value adjustment can be easily performed.
As shown in
In regards to a wide-width surface (a XY surface) of the winding frame part 32A, intervals between the adjacent turns of the wire 51A of the loose winding portion 54A are defined as pitches P1, P2, . . . , and Pn. As shown in
Further, in regards to a narrow-width surface (an XZ surface) of the winding frame part 32A, intervals between the adjacent turns of the wire 51A of the loose winding portion 54A are defined as pitches SP1, SP2, . . . , and SPm. See for example,
The loose winding portion 54A has a gap S1 (see, for example,
Specifically, it is most effective to move the pitches P1 or SP1 for adjusting an inductance value. Because the adjacent turns of the wire 51A that form the pitches P1 or SP1 are the located closest to the end of the core 20A, the influence to distribution of a magnetic flux being generated by the end of the core 20A is the greatest. Similarly, the influence to the distribution of the magnetic flux of the adjacent turns of the wire 51A that form the pitches P2 or SP2 is the second greatest. On the other hand, the influence to the distribution of the magnetic flux of the adjacent turns of the wire 51A that form the pitches Pn or SPm is the smallest, and in general, the wires 51A (the turns of the wire 51A) are not moved or a pitch length of them is not changed. Therefore, a pitch length of the pitch P1 is different from a pitch length of the pitch Pn.
Further, with respect to a fine adjustment of an inductance value, it is acceptable that only the very first wire 51A from the other end side (the X2 side) of the winding frame part 32A is moved. Therefore, in this case, only the pitch SP1 changes, and the other pitches SP2-SPm and the pitches P1-Pn are not changed. In other words, in this case, a length of the pitch SP1 is different from a length of the pitch SPm, however, a length of the pitch P1 is the same as a length of the pitch Pn.
Further, as explained above, the lengths of the pitches P1-Pn or the pitches SP1-SPm can be lengthened or shortened (expanded or compressed) in order to adjust an inductance value. However, it is preferred to shorten a length of each pitch. That is, it is preferred that the length of the pitch P1 is shorter than the length of the pitch Pn, or the length of the pitch SP1 is shorter than the length of the pitch SPm.
Further, the wire 51A of the lower layer and the wire 51A of the upper layer are wound so as to cross each other. Therefore, the wires 51A (the turns of the wire 51A) of the upper layer are easier to move than the wires 51A (the turns of the wire 51A) of the lower layer. This configuration is shown in
As shown in
On the other hand, as shown in
Next, the connection terminal 60A will be explained. The connection terminal 60A shown in
Further, the case 90A covers the entirety of the antenna device 10A, and has a cylindrical shape for covering the coil 50A and the bobbin member 30A explained above. Further, it is also possible that the case 90 has a mounting portion to which an external equipment/device is attached.
Method for Manufacturing of the Antenna Device 10A
When the antenna device 10A that has the configuration explained above is manufactured, the bobbin member 30A is formed by injection molding, and separately, the connection terminal 60A is formed by press-forming. Further, after the bobbin member 30A is formed, the connection terminal 60A is located at the terminal mounting part 35A and is inserted in the connector hole of the connector connection part 40A so as to be projected from the connector hole (corresponding to an insertion process of the connection terminal).
Prior to or after the above insertion process, the core 20A is attached to the core insertion part 34A (corresponding to a core insertion process). After the core 20A is attached, the wire 51A is wound around the winding frame part 32A so as to form the coil 50A (corresponding to a coil formation process). In this coil formation process, when the wire 51A for the lower layer is wound, the wire 51A is densely/tightly wound until the wire 51A reaches the partition 33A. As a result, the tight winding portion 53A on the lower layer is formed.
After the tight winding portion 53a is formed, the wire 51A is continuously and loosely wound around the winding frame part 32A from the partition 33A to the other end side (the X2 side) of the winding frame part 32A in the longitudinal direction (the X-direction). As a result, the loose winding portion 54A on the lower layer is formed. When the loose winding portion 54A on the side of the lower layer is formed, the winding is performed in a state in which a comparatively large gap S1 exists between the adjacent turns of the wire 51A.
Further, after the wire 51A reaches the other end side (the X2 side) of the winding frame part 32A in the longitudinal direction (the X-direction), the wire 51A is continuously and loosely wound around the winding frame part 32A toward the partition 33A in a state in which a winding direction is opposite to a winding direction of the wire 51A to form the lower layer. Therefore, the wire 51A of the upper layer is wound in a state of crossing (intersecting) with respect to the wire 51A of the lower layer.
Before or after the coil 50A is formed, one end of the wire 51A is entwined to a tip side of the entwining part 62A of one connection terminal 60A1 of the connection terminals 60A. Further, after the coil 50A is formed, the other end of the wire 51A is entwined to the entwining part 62A of another connection terminal 60A2 of the connection terminals 60A. After these ends of the wire 51A are entwined, the entwined parts explained above are fixed by, for instance, a dip method of soldering.
After the antenna device 10A is manufactured, it may be necessary to adjust an inductance value L thereof. This inductance value L can be obtained by using the following formula.
L=k×μo×π×a
2
×n
2
/b (1)
In regards to the above-mentioned formula, “k” corresponds to Nagaoka coefficient, “μo” corresponds to magnetic permeability, “a” correspond to a radius of the coil, “n” corresponds to the number of turns, and “b” corresponds to a coil length.
When the inductance value L is adjusted in the loose winding portion 54A, the wire 51A is moved in a direction in which a coil length “b” is shortened (that is, distances (intervals) of the pitches P1-Pn and the pitches SP1-SPm are shortened) by using a tool. In other words, in the loose winding portion 54A, the wire 51A is slid toward a location where the gap S1 at the predetermined portion becomes narrow. As a result, the inductance value L can be adjusted to a slightly increased inductance value. Further, when the tool is used for adjusting an inductance value, it is preferred that the loose winding portion 54A is provided at an end side of the antenna device 10A. In other words, when the tight winding portion 53A is provided at the end side of the antenna device 10Aa, and further, the loose winding portion 54A is provided between the tight winding portion 53A, and the terminal mounting part 35A and the connector connection part 40A, there is a possibility that the inductance adjustment work by using the tool is difficult to perform. This is because such as the barrier wall 35A2, a frame wall of the terminal mounting part 35A and the connector connection part 40A, and other parts become an obstacle for the inductance adjustment work. Therefore, in order to increase inductance adjustment work efficiency, it is preferred that the loose winding portion 54A is provided at the end side of the antenna device 10A.
Further, when a fine adjustment is performed in the loose winding portion 54A, it is preferred that the adjacent turns of the wire 51A are separated by a predetermined distance as much as possible. Therefore, it is preferred that a length of the loose winding portion 54A is equal to or more than a length of the tight winding portion 53A in the X-direction. Further, it is further preferred that the length of the loose winding portion 54A is equal to the length of the tight winding portion in the X-direction.
As discussed above, the antenna device 10A is configured with the core 20A, the bobbin member 30A, and the coil 50A. Specifically, the bobbin member 30A is provided at the outer circumferential side of the core 20A, and at the same time, has the partition 33A in a position located between both ends of the bobbin member 30a in the longitudinal direction. The coil 50 is formed by winding the wire 51A around the bobbin member 30A. Further, the coil 50A is configured with the tight winding portion 53A and the loose winding portion 54A. Specifically, the tight winding portion 53A is formed by densely winding the wire 51A with a dense winding density around one part of the bobbin member 30A located between the one end side (the X1 side) of the bobbin member 30A and the partition 33A. The loose winding portion 54A is formed by loosely winding the wire 51A with a loose winding density around the other part of the bobbin member 30A located between the partition 33A and the other end side (the X2 side) of the bobbin member 30A. Further, the first layer (the lower layer) and the second layer (the upper layer) are provided at the loose winding portion 54A. Also, because the winding directions of the first and second layers are different, the wire 51A composing the first layer and the wire 51A composing the second layer are stacked on each other so as to cross each other.
As explained above, the wire 51A that composes the first layer (the lower layer) and the wire 51A that composes the second layer (the upper layer) are stacked on each other so as to cross (intersect) each other in the loose winding portion 54A. Therefore, it is easy to make the wire 51A of the second layer (the upper layer) slide relative to the wire 51A of the first layer (the lower layer). As a result, it becomes possible to easily adjust an inductance value even though it has a simple configuration.
The antenna device 10A according to the embodiments of the present invention does not need to use a separate/additional magnetic substance core such as the second magnetic substance core as disclosed in Japanese Patent Number 5050223. Further, a second coil wound around the second magnetic substance core also does not need to be used. Therefore, it becomes possible to simplify the configuration for adjusting an inductance value.
In the first embodiment of the present invention, the terminal mounting part 35A to which the connection terminal 60A is attached is provided at the one end side (the X1 side) of the bobbin member 30A. Further, the tight winding portion 53A is provided at a side that is close to the terminal mounting part 35A relative to the loose winding portion 54A. Therefore, it is possible to obtain a configuration in which the wire 51A of the second layer (the upper layer) can be easily slid.
That is, when the loose winding portion 54A is provided at the side that is close to the terminal mounting part 35A relative to the tight winding portion 53A, the loose winding portion 54A does not have an end portion where it is possible to freely access to the coil 50A because the loose winding portion 54A including the end portion is sandwiched between the terminal mounting part 35A and the tight winding portion 53A. Therefore, in this hypothetical case, the wire 51A of the second layer (the upper layer) of the loose winding portion 54A would be difficult to slide. On the other hand, as discussed in the above embodiment, when the tight winding portion 53A is provided at the side that is close to the terminal mounting part 35A relative to the loose winding portion 54A, the wire 51A of the second layer (the upper layer) of the loose winding portion 54A is easy to slide because the loose winding portion 54A has the end portion where it is possible to freely access the coil 50A at the other end side (the X2 side). As a result, it becomes possible to easily adjust the inductance value.
Further, in the first embodiment of the present invention, in regards to the loose winding portion 54A, the wire 51A that composes the first layer (the lower layer) and the wire 51A that composes the second layer (the upper layer) are located in a single layer along the sidewall part 32A1 of the bobbin member 30A. That is, the wire 51A that composes the first layer (the lower layer) and the wire 51A that composes the second layer (the upper layer) are located adjacent to one another in a single (common) layer without stacking onto or crossing each other. Therefore, on the top surface 32A2 and the bottom surface 32A3 of the winding frame part 32A, the intervals of the adjacent turns of the wire 51A of the first layer (the lower layer) and the intervals of the adjacent turns of the wire 51A of the second layer (the upper layer) can be comparatively large because the wire 51A that composes the first layer (the lower layer) and the wire 51A that composes the second layer (the upper layer) are stacked and cross each other. As a result, the configuration in which the adjustment of the inductance value can be easily performed can be realized.
Further, in the sidewall part 32A1, when the wire 51A of the second layer (the upper layer) is slid, in which a slide distance exceeds the gap S1, the adjacent wire 51A of the first layer (the lower layer) can also be slid. As a result, for instance, it becomes possible to prevent a winding collapse of the coil 50A that can occur by sliding only the wire 51A of the second layer (the upper layer). Further, a position of the wire 51A after sliding should be fixed with respect to the coil 50A. Specifically, both the wires 51A (the turns of the wire 51A) of the second and first layers come into contact with the sidewall part 32A1. Therefore, because of a winding force of the coil 50A and a frictional force between the wires 51A (the turns of the wire 51A) and the sidewall part 32A1, the position of the wire 51A after sliding can be easily adjusted without providing an extra fixing structure for the wire 51A.
Further, in the first embodiment of the present invention, each of the wire 51A of the first layer (the lower layer) and the wire 51A of the second layer (the upper layer) can cross the width direction (the Y-direction) perpendicular to the longitudinal direction (the X-direction) of the bobbin member 30A at an angle range of 3° to 177°. In the configuration explained above, the wire 51A of the second layer (the upper layer) crosses the wire 51A of the first layer (the lower layer) at an angle range of 6° to 174°. Therefore, the configuration in which the wire 51A of the second layer (the upper layer) can be easily formed on (cross) an upper side of the wire 51A of the first layer (the lower layer) can become realized.
In the first embodiment of the present invention, a length of the loose winding portion 54A can be longer than a length of the tight winding portion 53A in the X-direction. In this case, the intervals between the adjacent turns of the wire 51A can be provided more than a predetermined distance in the loose winding portion 54A. As a result, the fine adjustment of the inductance value L can become easily performed.
Further, in the first embodiment of the present invention, the length of the loose winding portion 54A can also be the same as the length of the tight winding portion 53A in the X-direction. In this case, while securing a predetermined inductance value L or more in the tight winding portion 53A, the fine adjustment of the inductance value L can be performed in the loose winding portion 54A.
In the first embodiment of the present invention, a distance between the adjacent turns of the wire 51A of the loose winding portion 54A that are located closest to the other end side (the X2 side) is different from a distance between the adjacent turns of the wire 51A of the loose winding portion 54A that are located closest to the one end side (the X1 side) (the partition 33A) in the longitudinal direction (the X-direction) of the bobbin member 30A. Therefore, it can also be possible that while moving (sliding) the wire 51A of the loose winding portion 54A that is located closest to the other end side (the X2 side), the wire 51A of the loose winding portion 54A that is located closest to the one end side (the X1 side) (the partition 33A) is not moved (slid). In this case, when only the wire 51A, which is located closest to the other side (the X2 side) of the core 20A and which is close to an end of the core 20A, is moved (slid), it becomes possible to increase the influence to the distribution of the magnetic flux.
Further, in the first embodiment of the present invention, a distance (pitch) between the adjacent turns of the wire 51A of the loose winding portion 54A that are located closest to the other end side (the X2 side) can be shorter than a distance between the adjacent turns of the wire 51A of the loose winding portion 54A that are located closest to the one end side (the X1 side) (the partition 33A) in the longitudinal direction (the X-direction) of the bobbin member 30A. Further, in this case, when the wire 51A that is located closest to the other end side (the X2 side) is moved (slid), the fine adjustment of the inductance value L can be performed.
An antenna device 10B according to a second embodiment of the present invention will be explained below with reference to the drawings. Further, in the second embodiment of the present invention, redundant explanations with respect to the same configurations as the antenna device 10A in the first embodiment of the present invention explained above are omitted. However, the alphabetic character “B” instead of the alphabetic character “A” that is used in the first embodiment is added to an end of each reference numeral. Thus, a configuration that has the alphabetic character “B” relates to the second embodiment of the present invention. Therefore, though explanations and illustrations are omitted in the second embodiment, the same configuration as the antenna device 10A in the first embodiment may also be explained by adding the alphabetic character “B”.
Specifically, the terminal mounting part 35B has three connection terminals 60B in all, not a pair of the connection terminals 60A in the first embodiment. Specifically, the connection terminals 60B1, 60B2 and 60B3 exist.
The connection terminal 60B1 has an insertion piece part 61B, an entwining part 62B, and a vertical (up and down) extension part 63B. The insertion piece part 61B extends in the longitudinal direction (the X-direction) and is the same as the insertion piece part 61A explained above. Therefore, one side (the X1 side) of the insertion piece part 61B projects inside the connector hole of the connector connection part 40B and can be electrically connected to the external connector that is inserted in the connector hole.
Further, one end of the wire 51B is entwined to the entwining part 62B in the same manner as the entwining part 62A explained above. The vertical extension part 63B extends in an up-and-down direction (the Z-direction). Therefore, positions of the insertion piece part 61B and the entwining part 62B in a height direction (the Z-direction) are different from each other.
The connection terminal 60B2 has the insertion piece part 61B and a chip support piece part 64B. The insertion piece part 61B has the same configuration as the insertion piece part 61B of the connection terminal 60B1. A dimension in the width direction (the Y-direction) of the chip support piece part 64B is larger than that of the insertion piece part 61B. Though both ends of the chip support piece part 64B enter into a resin portion of the bobbin member 30A, a part between both ends is exposed to an opening 35B1. One side of a chip type capacitor 100B is attached to this chip support piece part 64B in a state of being electrically connected.
The connection terminal 60B3 has the entwining part 62B and the other chip support piece part 64B. The other end of the wire 51B is entwined to the entwining part 62B. Further, the other side of the chip type capacitor 100B is attached to this chip support piece part 64B in a state of being electrically connected.
In the terminal mounting part 35B, the connection terminal 60B is provided in order not to project to an upper side (the Z1 side) from a (inner) bottom surface 32B3 of a bobbin part 31B (See
The bobbin member 30A of the antenna device 10A according to the first embodiment of the present invention has the barrier wall 35A2 that separates the terminal mounting part 35A from the core insertion part 34A. However, the bobbin member 30B according to the second embodiment of the present invention does not have a configuration that corresponds to a barrier wall. As shown in
Further, in the same manner as the core 20A of the first embodiment explained above, the core 20B is held in a core insertion part 34B by core holding projections 32B6 and an inner wall of the bobbin part 31B by being wound with the wire in the other end side (the X2 side).
Unlike the connector connection part 40A of the first embodiment, the connector connection part 40B is provided along the longitudinal direction (the X-direction). Further, a flange part 43B is provided at a boundary between the terminal mounting part 35B and the connector connection part 40B. In the second embodiment of the present invention, the flange part 43B is in a rectangular plate-like shape. Further, a step part 44B is provided at an outer circumferential edge of the flange part 43B. With this configuration, an opening edge of a case 90B is fitted into this step part 44B.
The antenna device 10B according to the second embodiment of the present invention also become possible to develop the same effects as the antenna device 10A according to the first embodiment of the present invention explained above.
Further, in the second embodiment of the present invention, the barrier wall 35A2 does not exist in the bobbin member 30B, and in addition, the connection terminal 60B does not project to the upper side (the Z1 side) farther than the bottom surface 32B3. Therefore, the core 20B can be slid to the side of the terminal mounting part 35B inside of the core insertion part 34B. As a result, it becomes possible to increase and decrease (when sliding of the core 20B is not performed at a side of the loose winding portion 54B, in particular, an inductance value decreases) an inductance value by sliding the core 20B in addition to the previously described inductance adjustment method, i.e., an inductance value is adjusted by sliding the wire 51B of a first layer (an upper layer) in a loose winding portion 54B.
Variation
Although the first and second embodiments of the present invention are explained above, the antenna device and the method for manufacturing the antenna device may be varied in many ways as explained below.
In the first embodiment of the present invention explained above, an electronic component is not attached between the pair of the connection terminals 60A, however, the same can also be attached. Further, in the second embodiment of the present invention explained above, though the chip type capacitor 100B is attached as an electronic component, other electronic components such as a resistor can also be attached. Further, as an electronic component, any of a surface-mounting type or a pin type can be used.
Further, in the first and second embodiments explained above, the loose winding portions 54A and 54B are located at the other end side (the X2 side) in the longitudinal direction (the X-direction) and the tight winding portions 53A and 53B are located at the one end side (the X1 side) in the longitudinal direction (the X-direction). However, a locational configuration is not limited to the above configuration. Specifically, the loose winding portions 54A and 54B can also be located at the one end side (the X1 side) in the longitudinal direction (the X-direction) and the tight winding portions 53A and 53B can also be located at the other end side (the X2 side) in the longitudinal direction (the X-direction).
Further, a plurality of the loose winding portions 54A and 54B can be provided. Thus, the tight winding portions 53A and 53B can be located between the plurality of the loose winding portions 54A and 54B, respectively. Similarly, a plurality of the tight winding portions 53A and 53B can be provided. Thus, the loose winding portions 54A and 54B can be located between the plurality of the tight winding portions 53A and 53B, respectively.
Further, in the first and second embodiments explained above, only one of the cores 20A and 20B is respectively provided. However, a plurality of cores can also be provided. Further, in regards to the bobbin member, as long as it is capable of forming the tight winding portion and the loose winding portion, any configuration can also be adopted. Further, any number of the connection terminals can be adopted. Further, any configuration (shape and size) of the connection terminals can also be adopted.
The antenna device and the method for manufacturing of the antenna device being thus described, it will be apparent that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be apparent to one of ordinary skill in the art are intended to be included within the scope of the following claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2016-080640 | Apr 2016 | JP | national |
This application is a continuation of U.S. patent application Ser. No. 15/460,306, filed on Mar. 16, 2017, which claims priority to Japanese Patent Application No. 2016-080640, filed on Apr. 13, 2016, both applications of which are hereby expressly incorporated by reference herein in their entireties.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 15460306 | Mar 2017 | US |
| Child | 16218046 | US |
