MXPA06003829A - Antenna coil and antenna device - Google Patents

Abstract

a core (3) having a magnetic material formed into a bar shape;a bobbin (1) having a through hole (12) through which the core (3) is inserted;a connection section (15) fixed to the bobbin (1) in such a manner that it extends from the bobbin (1) in the length direction of the core (3) when the core (3) is inserted into the through hole (12);a winding (14) wound on the bobbin (1) and having a terminal connected to the connection section (15);and a connector terminal (25) arranged at a certain position in the length direction of the core (3) for fixing the connection section (15) and deciding the position of the winding (14) in the length direction of the core (3).

Description

ANTENNA COIL AND ANTENNA DEVICE TECHNICAL FIELD The present invention relates to an antenna coil and an antenna device to be used, for example, to transmit and receive a radio wave.

BACKGROUND OF THE TECHNIQUE Japanese Examined Application for Utility Model No. Sho44-18178 (hereinafter referred to as Patent Document 1) describes a magnetic antenna. This magnetic antenna has a ferrite core in the form of a rod, a coil spool into which the ferrite core is inserted, a main winder around the spool spool, and a small spool provided on each side of the main spool. In this magnetic antenna, the main coil moves in a length direction of the ferrite core to cause a change in induction, making it possible to perform the tracking adjustment. However, in the conventional magnetic antenna, the electrical connection between the small coils and the main coil is made by using windings that form these coils as they are. In this way, in the case where the main coil is moved with a view to set the reactance value of the magnetic antenna to a desired value, when the main coil is released, the main coil is pulled by the windings that connect the reels small and the main coil, resulting in the positional deviation of the main coil. If the main coil is fixed in position by resin, a ribbon or the like while being held by hand, etc. , the main coil is likely to be changed during the curing of the resin, or the adhesive force of the tape is likely to be reduced, resulting in the positional deviation of the main coil. As a result, the completed product is likely to include the variation in the reactance value. Furthermore, in the case in which an attempt is made to fix the main coil to a desired position with the resin, the next operation can not be performed until the resin has dried and cured, resulting in an assembly time to its lasting time. To suppress such positional deviation from the main coil, it may be possible to increase the length of the windings connecting the small coils and the main coil, achieving a length that provides the same space with respect to the adjustment range of the main coil. However, when the length of the windings connecting the small coils and the main coil is increased, the cabling can be agitated due to vibration or the like applied to the magnetic antenna, and a fatal problem, such as a cable break, It is likely to happen.

In addition, due to the agitation of the coils that connect the small coils and the main coil, it is difficult to stabilize the reactance value.

The present inventor has conducted careful study to solve the above problems before completing the present invention. An object of the present invention is to obtain an antenna coil and an antenna device that allow easy positional adjustment of the windings and that is relatively free of positional deviation of the windings after adjustment.

DESCRIPTION OF THE INVENTION An antenna coil according to the present invention includes: a core formed in shaping a magnetic material in a bar-like configuration; a reel that has a hole with exit in which the nucleus will be inserted; a connecting section fixed to the spool so as to extend in a direction of core length from the spool, with the core inserted into the exit hole; a winding that is wound around the spool and whose ends are connected to the connecting section; and a connector terminal that is provided at a certain position in the length direction of the core, which fixes the connection section in position, and which determines a position of the winding in the length direction of the core. With this construction, the winding is electrically connected to the connector terminal through the intermediation of the connection section. Therefore, it is possible to set the reactance value to a desired value when moving the winding together with the reel in the direction of core length. In particular, even if the coil is released after moving with the spool in the direction of core length to be placed at a desired position, the coil remains in that position together with the spool. Furthermore, even when the coil moves along with the spool in the direction of core length, no force due to the expansion and contraction of the winding, etc. , is generated between the coil, which moves with the spool, and the connector terminal. As a result, it is easy to adjust the position of the coil together with the spool in such a way that a desired reactance value is obtained. In addition, it is possible to fix the winding in a position that provides a desired reactance value exclusively by fixing the connection section and the terminal to each other by welding or the like after adjustment. As a result, there is no fear that the winding position will deviate after adjustment, and it is possible to suppress the variation in the reactance value in the completed product. Furthermore, since it is possible to fix a coil apposition by fixing the connection section in position by the connector terminal, it is possible, in contrast to the case in which the coil is sealed with an insulating resin or the like together with the reel , start the next operation without having to wait until the resin dries (until the adhesive heals). As a result, it is possible to shorten the assembly time. In addition to a construction of the invention as described above, in an antenna coil according to the present invention, the connector terminal is provided on a connector main body having another outlet hole in which the core will be inserted. By adopting this construction, it is also possible to move the main connector body in the direction of core length. Therefore, the position of the connector terminal on the antenna coil can be easily changed without changing the basic structure of the antenna coil. As a result, even in a case where antenna coils of a plurality of specifications, for example, antenna coils having the same requisite reactance value and different connector terminal positions, are required, it is possible to provide coils of antenna of such specifications when using a unique type of antenna coil. In addition to the constructions of the inventions as described above, in an antenna coil according to the present invention, the connecting section is formed of a rigid material; a second hole with outlet is formed in the main connector body in order to extend together with the other outlet hole; and the connecting section is inserted into the second hole with outlet. By adopting this construction, the connecting section is formed of a rigid material, and both ends thereof are retained by the spool, the core, and the main connector body. Therefore, as compared to the case in which the spool and the connector are connected by a winding, the vibration is less likely It happens even if the vibration is applied to the antenna coil, so a fatal problem, such as an electrical cable break, does not originate easily. Also, there is no fear that the connection section will differ between the reel and the connector. Therefore, in contrast to the conventional construction in which the wiring differs between the winding and the connector, there is no fear that the reactance value will fluctuate due to the agitation of the deferred wiring caused by the vibration, etc. In addition to the constructions of the invention as described above, in an antenna coil according to the present invention, a capacitor is provided on the main body of the connector; and the connector terminal is connected to the capacitor. By adopting this construction, a resonance circuit is formed by the coil and the capacitor in the antenna coil. In particular, the coil and the capacitor are integrated, so that it is easy to adjust a characteristic, such as the resonance frequency of this resonance circuit, to a predetermined characteristic. Furthermore, in contrast to the case in which the coil and the capacitor are provided separately, the resonance circuit is relatively free from the influence of the length of the wiring between the coil and the capacitor, so that it is possible to suppress the variation in the characteristics of the resonance circuit. In addition to the constructions of the inventions according to described above, in an antenna coil according to the present invention, the connection section has two rigid connective members; one end of the coil is connected to a rigid member of the connecting section; another end of the coil is connected to another rigid member of the connection section; the connector terminal has two conductive joint parts; a joining part of the fixed connector terminal in position the rigid member of the connecting section to which one end of the coil is connected, and another connecting part of the fixed connector terminal in position the rigid member of the section of connection to which the other end of the winding is connected. By adopting this construction, the winding can be connected to a radio circuit through the connector terminal, and there is no need to provide a conductor or the like which is conducted from the winding and the run to the outside of the coil. antenna and that is subjected to a cable break, and there is little chance of a cable break. An antenna device according to the present invention includes: an antenna coil according to the inventions described above; a fastener having an accommodation part formed by a main fastener body and a side surface portion provided vertically on the fastener main body, with the accommodation part accommodating the antenna coil; and a cover for hermetically sealing the accommodation part. By adopting this construction, it is possible to cover the coil of complete antenna with the fastener and cover. As a result, it is possible to maintain a stable electrical characteristic for a long period of time. In addition to the constructions of the invention as described above, in an antenna device according to the present invention, the connector terminal of the antenna coil is provided on a main connector body having another outlet hole in which the core will be inserted; and the side surface portion and the main connector body of the antenna coil respectively have meshing portions meshed together and which determine a position of the main connector body in a direction of core length. By adopting this construction, the main connector body of the antenna coil is meshed with the side surface portion of the fastener by these meshing parts. Therefore, it is possible to fix the main connector body of the antenna coil and the reel connected thereto through the connection section (and, by extension, the coil) to desired positions within the accommodation part. In addition to the constructions of the inventions as described above, an antenna device according to the present invention also includes two damping members having exit holes into which the core of the antenna coil is inserted and higher than an antenna coil. depth of the accommodation part. In this antenna device, a gear member provided on the cover is inserted into an exit hole formed in the main fastener body, whereby the cover hermetically seals the accommodation part. By adopting this construction, in the state in which part of accommodation is hermetically sealed by the cover, the two cushion members are compressed between the cover and the main fastener body. The core is held by the pressing force of the damping members, so that the core is fixed within the accommodating part. Therefore, it is possible to fix the main connector body, the spool, the winding, and the core in position within the accommodation part without having to use fixing members, such as screws, adhesive, or the like. As a result, it is possible to achieve, through adjustment, a desired positional relationship between the core and the reel, and maintain the same.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an exploded perspective view of an antenna device according to an embodiment of the present invention. Fig. 2 is a perspective view for illustrating a first step for assembling the antenna device shown in Fig. 1. Fig. 3 is a perspective view for illustrating a second step for assembling the antenna device shown in Fig. 1.

Fig. 4 is a side view to illustrate a third aspect for assembling the antenna device shown in Fig. 1. Fig. 5 is a diagram showing an example of a way in which the antenna device shown in Fig. 1 is used.

BEST MODE FOR CARRYING OUT THE INVENTION In the following, an antenna coil and an antenna device according to one embodiment of the present invention will be described with reference to the drawings. In the following description, the antenna coil is considered as constituting a part of the antenna device.

Modality Fig. 1 is an exploded perspective view of an antenna device 10 according to an embodiment of the present invention. The antenna device 1 0 has a spool 1, a connector 2, a core 3, two shock-absorbing members 4 and 5, a fastener 6, and a cover 7. The spool 1 has a main spool body 1 1. The main spool body 1 1 is formed of an insulating material such as a plastic, and has an external configuration in substantially rectangular parallelepiped shape. The flanges are formed at the ends of a pair of opposite surfaces of the main spool body 1 1, and a winding is screwed around the four remaining surfaces of the main body of reel 1 1. Regarding the external configuration of the main body of spool 11, it can also be formed as a cube whose six surfaces are the same size, or as a cylinder. In the following, in the attitude shown in Fig. 1, the surface on the upper side as seen in the figure will be referred to as the upper surface 1 1 a of the main spool body 1 1, the lateral surfaces with a lateral width The largest observed in Figure 1 will be referred to as the longer side surfaces 1 1 b of the main spool body 1 1, the side surfaces with a smaller side width as seen in the figure will be referred to as the shorter side surfaces 1 1 c of the main spool body 1 1, and the surface opposite the upper surface 1 1 a of the spool main body 1 1 will be referred to as the lower surface 1 1 d of the spool main body 1 1. The main spool body 1 1 has a bore with outlet 12 extending in the longitudinal direction of its rectangular parallelepiped configuration. As a result, openings are formed in the two shorter lateral surfaces 1 1 c of the main spool body 1 1. The hole with outlet 12 has a rectangular sectional configuration. The sectional configuration of the hole with outlet 12 can also be grid or circular. The sectional configuration of the hole with outlet 12 is preferably similar to the external configuration of the main spool body 1 1. In this case, the main body of reel 1 1 is formed in a Thin wall thickness, substantially uniform. In addition, the main spool body 1 1 has a cavity 13 formed by the side surfaces and the flanges. The cavity 13 is formed on the entire periphery formed by the upper surface 1 1 a, the two longer lateral surfaces 1 1 b, and the lower surface 1 1 d of the main spool body 1 1. A coil 14 formed of a conductive material such as a copper wire is screwed around the cavity 13. As a result, a coil is formed. The main spool body 1 1 has flanges at both longitudinal ends thereof, so that there is no fear that the spool 14 can slide from the main spool body 1 1. further, the main spool body 1 1 has flanges at both longitudinal ends thereof, so that the winding of the spool 14 can be started from one of those two ends, thus the operation of winding the spool 14 around the spool main body 1 1 can be made easier. Two long terminals 15 as connecting sections are fixed to another longitudinal end of the main spool body 1 1. The long terminals 15 are formed as rigid members formed of a metal such as steel or aluminum, which is harder than the winding 14 , and each of the long terminals 1 5 has a long terminal main body 15a and two protrusions 15b, 15c. The long terminal main body 15a is formed in a bar-like configuration. The two protrusions 15b, 15c are provided in positions closer to one end of the long terminal main body 15a and protrude in a direction perpendicular to the length direction of the long terminal main body 15a. One end of the long terminal main body 15a of each long terminal 15 is fixed to a portion on one of the surfaces 1 1 c of the main spool body 1 1 near the surface 1 1 a. The attachment of each long terminal 15 is effected by inserting one end of the long terminal main body 15a into an adjustment-engaging hole formed in the main spool body 1 1. The two long terminals 15 are fixed to the main spool body 1 1 in such a way that their long terminal main bodies 15a are substantially parallel to each other and extend in the longitudinal direction of the outlet hole 12 of the main spool body 1 1 . Each end of the winding 14 is connected to the protrusions 1 5b of the two long terminals 15 closest to the other ends (distal ends) by welding or the like. The protrusion 15c closest to one end (fixed end) of each long terminal 15 is curved, and each end of the coil 14 is supported by the curved protrusions 15c. As a result, even if, due to vibration or the like, winding 14 is exerted on such a force as the winding 14 could move in the longitudinal direction of the main spool body 1 1, that force is not easily allowed to act on the connection parts. The connector 2 has a main body of connector 21. The main connector body 21 is formed of an insulating material such as an insulating plastic, and is formed in a shaped configuration. substantially rectangular parallelepiped. The external configuration of the main connector body 21 can also be substantially indile cylindrical. In the following, in the attitude as shown in Fig. 1, the surface on the upper side as seen in the figure will be referred to as the upper surface 21 a of the main connector body 21, a pair of opposite side surfaces according to in the figure, it will be referred to as the first side surfaces 21 b of the main connector body 21, another pair of opposite side surfaces will be referred to as the second side surfaces 21 c of the connector main body 21, and the surface opposite the top surface 21 a of the main connector body 21 will be referred to as the lower surface 21 d of the main connector body 21. The main connector body 21 has a hole with outlet 22 formed therein as another outlet hole. As a result, the openings are formed in the two second side surfaces 21 c of the main connector body 21. The exit hole 22 has a rectangular sectional configuration. The sectional configuration of the hole with outlet 22 can also be grid or circular. However, it is desirable, for the exit hole 22 of the main connector body 21 to be of the same sectional configuration as the exit hole 12 of the main reel body 1 1. Each of the first two lateral surfaces 21 b of the main connector body 21 has flange portions 23 as gear parts. The flange portions 23 are formed in positions on the first side surfaces 21 b near the bottom surface 21 d so as to be perpendicular to the bottom surface 21 d. That is, the parts of the first side surfaces 21 b near the bottom surface 21 d are cut, leaving the flange portions 23. The main connector body 21 has a second hole with outlet 24 parallel to the outlet hole 22. As a result, the two second side surfaces 21 c of the main connector body 21 have openings in positions closer to the upper surface 21 than the opening with outlet 22. The connector 2 has two connector terminals 25. The connector terminals 25 are formed from a conductive material, and a part thereof protrudes from between the second hole with outlet 24 of one of the two second lateral surfaces 21 c and the upper surface 21 a. At the forward ends of the protrusions 25a of the connector terminals 25, curved portions 25b are formed protruding in a direction perpendicular to the projecting direction. The curved parts 25b are also curved towards the underside of the protrusions 25a. Openings are formed between the curved portions 25b, which are curved, and the protrusions 25a. A capacitor 26 is placed on the upper surface 21 a of the main connector body 21. The capacitor 26 is connected to one of the two connector terminals 25. A resonance circuit is formed by the capacitor 26 and the winding 14. The two surfaces 21 b have slots 27 formed to be perpendicular to the surfaces 21 a, and the terminals 28 are provided at the side surface ends 21 a of the slots 27. The terminals 28 are electrically connected to the resonance circuit formed by the capacitor 26 and the coil 14. Connected to terminals 28 are an external radio circuit, wiring, etc. The core 3 is formed of a magnetic material such as nickel zinc ferrite or zinc manganese ferrite, and has a rod-like configuration. The core 3 has a rectangular section substantially the same size as the hole with outlet 12 of the reel 1 and the hole with outlet 22 of the connector 2 or slightly smaller than the holes with exit 12, 22. That is, the sectional configuration of the core 3 is such that the holes with outlet 12, 22 are slidable when the core 3 is inserted into the holes with outlet 12, 22. The sectional configuration of the core 3 can be grid or circular. The fastener 6 has a main fastener body 31.

The main fastener body 31 is formed of an insulating material such as insulating plastic, and is formed as a flat plate longer than the core 3. A hole with outlet 32 is formed at either end of the main fastener body 31. Provided vertical on the main fastener body 31 are two longer side surface portions 33 as side surface portions, and two shorter side surface portions 34 as side surface portions.

The two longer side surface portions 33 and the two shorter side surface portions 34 form an oblique box without a lid together with fastener main body 31. In the following, this oblique box will be referred to as an accommodating part 35. The inner part of the accommodating part 35 is longer than the core 3, and is formed in a width that is the same or is in a certain way more length than the width of the shorter side surfaces 1 1 c of the main spool body 1 1 and the second side surfaces 21 c of the main connector body 21. In each of the two longer side surface portions 33, a cutting part 36 is formed as a meshing part. In addition, the two longer lateral surface portions 33 are provided vertical in positions of certain shape on the inner side of the outer peripheral edge of the main fastener body 31. Between each of the longer side surface portions 33 and the outer peripheral edge of the main fastener body 31, three outlet holes 37 are formed. In addition, the cutting portions 38 are formed in the longer side surface portions 33. , and the main fastener body 31 has holes with outlet 39 (see Fig. 4) formed therein extending from the cutting portions 38 of the longer side surface portions 33. The cover 7 has a main body of cover 41 . The main body of cover 41 is formed of an insulating material such as insulating plastic, and is formed as an elongated flat plate.

The longer sides of the main cover body 41 have the same length as the longer side surface portions 33 of the fastener 6, and the shorter sides of the main cover body 41 have the same length as the shorter side surface portions. 34 of the fastener 6. In addition, the main cover body 41 has six meshing members 42 provided vertical. The six engagement members 42 are positioned along the longer side sides of the main deck body 41, three on each side. The damping members 4, 5, have main shock absorber bodies 51. The main shock absorber bodies 5.1 are formed of a flexible rubber material, and are formed as vertically elongated cubes. The height of the main shock bodies 51 is somewhat longer than the depth of the accommodation part 35. In addition, the main damper bodies 51 have a hole with outlet 52. The holes with outlet 52 of the damper are formed by being of the same size as or slightly smaller than the contour of the core 3. Next, the assembly of the antenna device 10, constructed as described above, and the adjustment of the resonance frequency of the antenna device 10 will be described. Fig. 2 is a perspective view for illustrating a first assembly step for the antenna device 1 0 shown in Fig. 1. First, the core 3 is inserted into the hole with exit 12 of the spool 1, to which the two long terminals 1 5 are fixed, and towards the hole with outlet 22 of the connector 2. Moreover, the two long terminals 15 of the spool 1 are inserted in the openings between the protrusions 25a and the curved parts 25b of the connector terminals 25, and towards the second hole with outlet 24 of the connector 2. Fig. 3 is a perspective view for illustrating a second assembly step for the antenna device 10 shown in Fig. 1. After that, the final parts of the core 3, inserted in the reel 1 and the connector 2, are respectively inserted in the holes with exit of the damping members 4, 5. Fig. 4 is a side view to illustrate a third stage of assembly for the antenna device 10 shown in Fig. 1. The core 3, to which the spool 1, the connector 2, and the two shock-absorbing members 4, 5, are mounted, is inserted into the accommodating part 35 of the fastener 6. At this time, the two shock-absorbing members 4, 5, they are positioned adjacent to the other two shorter side surface portions 34. The two flange portions 23 of the connector 2 are respectively inserted into the cutting portions 36 of the fastener 6. The slots 27 of the connector 2 are positioned so as to be continuous with the cutting parts 38. As a result, the connector 2 is fixed in the position within the accommodating part 35, and there is no fear that the connector 2 can move even if the fastener 6 moves within the accommodating part 35. In the assembly state of Fig. 4, the resonance frequency of the antenna device 1 is adjusted by moving the reel 1 in the length direction of the core 3. At this point of time, the reel 1 is not fixed in position but is slidable in the direction of the length of the core 3. To be more specific, an AC voltage of a predetermined resonance frequency is applies to the part between the capacitor 26 and the other connector terminal 25 through the terminal 28, and the impedance is measured while varying the position of the spool 1, that is, the position of the winding 14, in the direction of length of the core 3, then the spool 1, that is, the winding 14 is placed in a position where the impedance is at an extreme value. As a result, the reactance value due to the winding 14 and the core 3 achieves a desired value. After the positional adjustment of the reel 1 in the length direction of the core 3 has been completed, the long terminals 15 and the connector terminals 25 are fixed to each other in this state. In this process, for example, a force is applied to the two connector terminals 25 of the connector 2 from above (ie, on the side opposite the core 3), and the curved parts 25b are brought into contact with the core 3 to press the union of the long terminals 15 and the connector terminal 25 with each other. After this, the two long terminals 15 and the two connector terminals 25 are welded together. As a result, synergistically with the fact that the curved portions 25b engage the lower surfaces of the long terminals 15, the electrical connection between the long terminals 15 and the connector terminals 25 becomes firm. It is also possible to apply an adhesive insulator to the periphery of reel 1 and connector 2 to make it hard for them to move it. Finally, the cover 7 is placed in the accommodating part 35 of the fastener 6. At this time, the six engaging members 42 of the cover 7 are respectively inserted into the holes with outlet 37 of the fastener 6. The cover 7 is pushed up that the distal ends of the engagement members 42 engage the fastener 6, thereby sealing the front of the accommodation portion 35 by the main cover body 41. In the state in which the accommodating part 35 is sealed, the two cushion members 4, 5 are compressed to some degree by the main cover body 41, and the final parts of the core 3 are maintained by the pressing force of the shock absorber members 45. As a result, it becomes hard for the core 3 to move into the accommodation part 35, making it possible to maintain the previously adjusted positional relationship between the core 3 and the reel 1. Fig. 5 is a diagram showing an example of the manner in which the antenna device 10 shown in Fig. 1 is used. As shown in Fig. 5, the antenna device 10 shown in Fig. 1 is fixed, for example, to the inner side of an automatic door 61 by means of riveting nails or screws passed through the holes with exit 32 of the fastener 6. Apart from this, the antenna device 1 0 can also be placed inside a bumper, a console, etc. of a car. The two terminals 28 of the connector 2 are connected to a device of Input control without key 63 or the like through wiring 62 called an automotive harness. When, for example, an AC signal is input of the input control device without key 63 for transmitting energy, a signal, etc. , a radio wave based on that signal is transmitted from the antenna device 10. Further, when, for example, a radio wave from an input key without a key (not shown) is received, the antenna device 10 outputs the one based on that radio wave to the input control device without key 63. The input control device without key 63 has a radio circuit, and performs closure or non-closure based on the signal obtained through a radio wave. As described above, in this embodiment, the winding 14 is electrically connected to the connector terminals 25 through the long terminals 15. In this way, it is possible to set the reactance value to a desired value by moving the spool 1 and , by extension, the winding 14, in the length direction of the core 3. In particular, even if the spool 1 (and, by extension, the winding 149 is released after being moved by hand in the length direction of the core 3 and is located in a desired part, the spool 1 (and, by extension, the winding 14) remains in that position.Also, even if the spool 1 (and, by extension, the winding 14) moves in the length direction of the core 3, no force due to the expansion and contraction of winding 14, etc., is generated between the spool '1 (and, by extension, the winding 14) and the terminals of connector 25. As a result, the position of the spool 1 (and, by extension, the winding 14) can be easily adjusted in order to obtain a desired reactance value. In addition, exclusively by fixing the long terminals 15 and the connector terminals 25 together after adjustment, it is possible to place the winding 14 in the position where the desired reactance value can be obtained. As a result, the winding 14 does not exceed the positional deviation after adjustment, making it possible to suppress the variation in the reactance value in the completed product. Furthermore, it is only necessary to fix the long metal terminals 15 and the connector terminals 25 with each other, so that, in contrast to the case in which the winding 14 is sealed with an insulating resin or the like, it is possible to start the next operation without having to wait until the resin dries (until the adhesive heals). As a result, it is possible to decrease the assembly time. In this embodiment, the cones terminals 25 are placed on the main connector body 21 having the outlet hole 22 into which the core 2 is inserted, such that the main connector body 21 can also be moved in the direction of core length3. In this way, the positions of the connector terminals 25 in the antenna device 1 0 can be easily changed without changing the basic construction of the antenna device 10. As a result, even in a case in which there is a need for antenna devices 10 of a plurality of specifications in which, for example, the requisite reactance value is the same and in which the positions of the connector terminals 25 vary, it is possible to satisfy the need with a single type of antenna devices 10. In this embodiment, the long terminals 15 are rigid members, and the second holes with outlet are formed in the main connector body 21 to extend along the exit hole 22, with the long terminals 15 inserting in the second holes with exit. In this manner, the long terminals 15 are formed as elongated terminals using a material of greater strength than the coil 14 for the coil, and their ends are retained by the spool 1, the core 3, and the main connector body 21. In this way, as compared to the case in which the connection between the spool 1 and the connector 2 is effected by the winding 14, the antenna 1 0 is less likely to vibrate even if the vibration is applied to it, so that a fatal problem such as an electrical cable breakdown, does not originate easily. In addition, the long terminals 15 do not differ between the reel 1 and the connector 2. Thus, in contrast to the conventional construction in which the wiring is deferred between the winding 14 and the connector 2, there is no fear that the value of reactance may fluctuate due to the agitation of the deferred wiring caused by the vibration or the like.

In this embodiment, the capacitor 26 is placed on the main connector body 21, and the connector terminals 25 are connected to the capacitor 26. That is, in the antenna device 10, a resonance circuit is formed by the winding 14. as the coil and the capacitor 26. In particular, the coil 14 as the coil and the capacitor 26 are integrated, such that the characteristics of the resonance circuit such as resonance frequency can be easily adjusted to the predetermined characteristics. In addition, the resonance circuit is not easily influenced by the length, etc. , of the wiring between the winding 14 as the coil and the capacitor 26 as in the case in which the winding 14 as the coil and the capacitor 26 are provided separately, so that it is possible to suppress the variation in the characteristics of the circuit resonance. In this embodiment, both ends of the winding 14 are connected to the two long terminals 15 formed of a rigid material, and the connector terminals 25 have two conductive connection parts, with a connecting portion of the connector terminals 25 securing in position. the long terminal 15 to which one end of the winding 14 is connected, and the other connecting part of the connector terminals 25 securing in position the long terminal 15 to which the other end of the winding 14 is connected. In this way, the winding 14 can be connected to a radio circuit through the connector terminals 25, and there is no need to provide a conductor or the like, which is subject to a cable break, being driven from the winding 14 and coil 1 to the outside of the antenna coil, and there is little chance of a cable breaking. In this embodiment, the antenna coil, which is formed by the core 3, the spool 1, and the connector 2, is completely covered with the fastener 6 and the cover 7. As a result, it is possible to maintain a stable electrical characteristic by a long period of time. In this embodiment, the cutting portions 36 are formed in the longer side surface portions 33, and the flange portions 23 are formed in the main connector body 21, with the flange portions 23 engaging with the cutting portions 26. , so that it is possible to fix the main connector body 21 and the spool 1 connected thereto (and, by extension, the winding 14) at desired positions within the accommodating part 35. In this embodiment, shock-absorbing members are provided. , 5, having the holes with outlet 52 allowing the insertion of the core 3 and which are higher than the depth of the accommodating part 35, and the meshing members 42 provided on the cover 7 are inserted in the holes with outlet 37 formed in the main fastener body 31, thereby sealing the accommodating part 35. In the state in which the accommodating part 35 is sealed by the cover 7, the two cushion members 4, 5, are compressed between the cover 7 and the main body of fastener 31. The core 3 is held by the pressing force of the damping members 4, 5, so that the core 3 is secured in position within the accommodating part 35. From this In this manner, the main connector body 21, the spool 1, the winding 14, and the core 3 can be secured in position within the accommodating part 35 without using fastening members such as screws, or adhesive or the like. As a result, it is possible to adjust the core 3 and the spool 1 to a desired positional relationship and maintain it. The preferred embodiment of the present invention described above should not be interpreted restrictively but allows several modifications and changes. In the above-described embodiment, the coil 14 wound around the spool 1, and the connector terminals 24 are connected together by the long terminals 15. It is also possible, for example, to form a protrusion on the spool 1, and to form on this protrusion a wiring that serves as a substitute for long terminals 15. Apart from this, it is also possible to extend the front end portion of the winding 14 and include the extended part in the aforementioned protrusion. Further, while in the previous mode the capacitor 26 is provided over the connector 2, the capacitor 26 may be provided, if possible, on the circuit side of the input control device without key 63 or the like instead of being provided over the connector 2. Furthermore, while in the previous embodiment the connector 2 and the fastener 6 are separate members, it is also possible to form them as an integral unit.

INDUSTRIAL APPLICABILITY The antenna coil and the antenna device according to the present invention can be used, for example, as an antenna for transmission and / or reception in a keyless entry system of a car, or as an antenna for the transmission and / or reception of the same or another type of radio wave.

Claims (8)

1. CLAIMS 1. An antenna coil characterized by comprising: a core formed by shaping a magnetic material in a bar-like configuration; a coil that has a hole with exit in which the core will be inserted; a connection section fixed to the reel so as to extend in a direction of core length from the reel, with the core inserted into the exit hole; a winding that is wound around the spool and whose ends are connected to the connecting section; and a connector terminal that is provided at a certain position in the length direction of the core, which fixes the connection section in position, and which determines a position of the coil in the length direction of the core.
2. 2. An antenna coil according to claim 1, characterized in that: the connector terminal is provided on a main connector body having another outlet hole into which the core will be inserted.
3. 3. An antenna coil according to claim 2, characterized in that: the connection section is formed of a rigid material; a second hole with outlet is formed in the main connector body in order to extend along the other hole - - with exit; and the connecting section is inserted into the second hole with outlet.
4. 4. An antenna coil according to claim 2, characterized in that: a capacitor is provided on the main connector body; and the connector terminal is connected to the capacitor.
5. 5. An antenna coil according to any of claims 1 to 4, characterized in that: the connection section has two rigid conductive members; one end of the coil is connected to a rigid member of the connecting section; another end of the coil is connected to another rigid member of the connection section; the connector terminal has two conductive joint parts; a connection part of the terminal connecting fixed in position the rigid member of the connection section to which one end of the winding is connected; and another connecting part of the fixed connector terminal in position the rigid member of the connecting section to which the other end of the coil is connected.
6. 6. An antenna device characterized by comprising: - an antenna coil according to any of claims 1 to 5; a fastener having an accommodation part formed by a main fastener body and a side surface portion provided vertically on the fastener main body, with the accommodation part accommodating the antenna coil; and a cover for hermetically sealing the accommodation part. An antenna device according to claim 6, characterized in that: the connector terminal of the antenna coil is provided on a main connector body having another outlet hole into which the core will be inserted; and the side surface portion and the main connector body of the antenna coil respectively have meshing portions meshed together and which determine a position of the main connector body in a direction of core length. An antenna device according to claim 7, further comprising two cushion members having exit holes in which the core of the antenna coil is inserted and higher than a depth of the accommodation part, characterized in that a The gear member provided in the cover is inserted into a hole with an outlet formed in the main body of the fastener, by means of which the cover hermetically seals the accommodation part.