JP2012019419A - Helical antenna, and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easy-to-handle helical antenna in which variation in antenna characteristics can be minimized, and to provide a method of manufacturing the same.SOLUTION: A helical antenna 1 comprises a flexible substrate 11, a flexible wiring board 10 having a line antenna 12 provided on the substrate 11, and a core material 20 around which the flexible wiring board 10 is wound. A first fitting part 13 is formed at a part on the outer periphery of the substrate 11, and a second fitting part 14 to be fitted to the first fitting part 13 is formed at another part on the outer periphery. The flexible wiring board 10 is wound around the core material 20 so that the line antenna 12 becomes spiral, and the first fitting part 13 and the second fitting part 14 are fitted to each other.

Description

  The present invention relates to a helical antenna and a method for manufacturing a helical antenna, and more particularly to a helical antenna that can be easily handled and capable of suppressing variations in antenna characteristics, and a method for manufacturing a helical antenna.

  Helical antennas are used in electronic devices using wireless communication such as mobile communication and wireless LAN (Local Area Network). As one of the helical antennas, there is known a helical antenna in which a flexible printed board on which a line-shaped conductor pattern is formed is wound around a core material made of a dielectric.

  Patent Document 1 below describes such a helical antenna. In this helical antenna, a flexible printed circuit board in which a plurality of linear conductor patterns are arranged in parallel at regular intervals is wound around a cylindrical core material made of a dielectric. Specifically, the flexible printed circuit board is wound around the core material so that each conductor pattern is inclined with respect to a plane perpendicular to the longitudinal direction of the core material, and one end portion of each conductor pattern Overlaps with the other end of the adjacent conductor pattern. As described above, the end portions of the respective conductor patterns overlap with each other, so that a plurality of conductor patterns become one, and the conductor pattern that becomes one has a spiral shape. The length in which the conductor patterns overlap is set to 1 / 4λ when the wavelength used for the antenna is λ.

  However, in the helical antenna described in Patent Document 1, it is necessary to accurately overlap each conductor pattern by ¼λ, and the antenna characteristics change if the length of overlapping conductor patterns is shifted. Therefore, it has been difficult to obtain a helical antenna with little variation in antenna characteristics.

  Therefore, in the helical antenna described in Patent Document 2 below, a protrusion is provided on the core material, and a hole that fits the protrusion is formed in the flexible printed circuit board. And when winding a flexible printed circuit board around a core material, positioning with respect to the core material of a flexible printed circuit board can be carried out by making the protrusion of a core material fit in the hole of a flexible printed circuit board. Thus, a helical antenna with little variation in antenna characteristics can be obtained.

Japanese Patent No. 3183457 No. 7-27687

  However, since the above-mentioned Patent Document 2 has a protrusion on the core member, when assembling a product including a helical antenna, there is a problem that the protrusion protruding from the side surface of the helical antenna becomes an obstacle and is difficult to handle. For this reason, a helical antenna that is easy to handle and can suppress variations in antenna characteristics is desired.

  Accordingly, an object of the present invention is to provide a helical antenna that can be easily handled and that can suppress variations in antenna characteristics, and a method for manufacturing the helical antenna.

  In order to solve the above problems, a helical antenna of the present invention includes a flexible substrate, a flexible wiring substrate having an antenna line provided on the substrate, a core member around which the flexible wiring substrate is wound, A first fitting part is formed on a part of the outer periphery of the substrate, and a second fitting part is formed on the other part of the outer periphery. The antenna line is wound around the core so that the antenna line is spiral, and the first fitting part and the second fitting part are fitted to each other.

  According to such a helical antenna, in a state where the flexible wiring substrate is wound around the core material, the first fitting portion and the second fitting portion formed on the outer periphery of the substrate are fitted, A relative position between a part of the outer periphery of the substrate and another part of the outer periphery is uniquely determined. Therefore, variation in the winding method of the flexible wiring board is suppressed. Thus, the antenna line is suppressed from being spirally wound around the core material, and variations in antenna characteristics are suppressed. Moreover, since the winding method of the flexible wiring board is fixed by fitting the first fitting portion and the second fitting portion as described above, it is not necessary to form a protrusion or the like on the core material, and handling Is easy.

  In the above helical antenna, the antenna line is linearly provided on the substrate, and the substrate is formed in a long shape along the longitudinal direction of the antenna line. Preferably, the first fitting portion and the second fitting portion are formed on opposite sides of the antenna line, and the flexible wiring board is spirally wound around the core member. .

  According to such a helical antenna, since there is one antenna line in the flexible wiring board wound in a spiral shape, there is no connection portion on the antenna line, and better antenna characteristics can be obtained. Furthermore, since the first fitting portion and the second fitting portion are formed on the opposite sides with respect to the antenna line, the first fitting portion and the second fitting portion are formed when the flexible wiring board is wound in a spiral shape. The joint part can be fitted. Therefore, variations in antenna characteristics due to variations in the winding method of the antenna line can be suppressed.

  Furthermore, in the above helical antenna, it is preferable that the first fitting portion and the second fitting portion have a stepped shape having a plurality of step portions having the same width and the same height.

  According to such a helical antenna, the first fitting portion and the second fitting portion can be easily fitted when the flexible wiring board is wound around the core material.

  Alternatively, in the above helical antenna, it is preferable that the first fitting portion and the second fitting portion each have an uneven shape.

  According to such a helical antenna, each of the first fitting portion and the second fitting portion has a concavo-convex shape. The position is suppressed from shifting in the depth direction and the width direction of the uneven shape, and the fitting accuracy is improved. Therefore, the flexible wiring board can be accurately wound by the core material to provide a helical antenna with less variation.

  In order to solve the above-described problem, a method for manufacturing a helical antenna according to the present invention includes a flexible substrate and an antenna line provided on the substrate. A preparation step for preparing a flexible wiring board in which a first fitting portion is formed and a second fitting portion is formed on the other part of the outer periphery, a preparation step for preparing a core material, and the antenna line include An assembly step of winding the flexible wiring board around the core material so as to form a spiral, and fitting the first fitting portion and the second fitting portion to each other. It is.

  According to such a method for manufacturing a helical antenna, when the flexible wiring board is wound around the core member, the first fitting portion and the second fitting portion formed on the outer periphery of the substrate are fitted to each other, thereby The relative position between a part of the outer periphery and the other part of the outer periphery can be uniquely determined. Therefore, since the winding method of the flexible wiring board is determined, it is possible to suppress the flexible wiring board from being scattered and wound around the core material. In this way, it is possible to suppress the antenna line from being spirally wound around the core material, and it is possible to manufacture a helical antenna in which variations in antenna characteristics are suppressed. Moreover, since the winding method of the flexible wiring board is determined by fitting the first fitting portion and the second fitting portion as described above, it is not necessary to form a protrusion or the like on the core material, and handling is easy. A helical antenna can be manufactured.

  Further, in the above method for manufacturing a helical antenna, the antenna line is linearly provided on the substrate, and the substrate has a long shape along the longitudinal direction of the antenna. The first fitting portion and the second fitting portion are formed on opposite sides of the antenna line, and the flexible wiring board is spirally wound around the core material in the assembly step. Is preferred.

  According to such a method for manufacturing a helical antenna, an antenna line can be easily spirally wound by winding a long flexible wiring board spirally around a core material. At this time, the first fitting part and the second fitting part are fitted to the antenna line so that the first fitting part and the second fitting part are formed on opposite sides. Can do. Therefore, variations in antenna characteristics due to variations in the winding method of the antenna line can be suppressed. Furthermore, since there is one antenna line and there is no connection part in the antenna line, there is no need to connect the antenna lines. Therefore, it is possible to easily manufacture a helical antenna in which variations in antenna characteristics are suppressed.

  Furthermore, in the above method for manufacturing a helical antenna, the first fitting portion and the second fitting portion preferably have a stepped shape having a plurality of step portions having the same width and the same height.

  According to such a manufacturing method of a helical antenna, it is easy to fit the first fitting portion and the second fitting portion in the assembly process. Therefore, it is possible to easily manufacture a helical antenna in which variations in antenna characteristics are suppressed.

  Or in the manufacturing method of said helical antenna, it is preferable that a said 1st fitting part and a said 2nd fitting part are each uneven | corrugated shape.

  According to such a method for manufacturing a helical antenna, the first fitting portion and the second fitting portion are each formed into an uneven shape, and the first fitting portion and the second fitting portion are fitted. The flexible wiring board can be wound around the core more accurately, and a helical antenna with less variation can be manufactured.

  Further, in the above-described helical antenna manufacturing method, the first fitting portion and the second fitting portion are provided at one location for each length of the flexible wiring board wound spirally around the core material. Preferably it is formed.

  According to such a method for manufacturing a helical antenna, since there are few places to be fitted, the effort of fitting is small, the configuration can be simplified, and a helical antenna with little variation in antenna characteristics can be easily produced. Can do.

  As described above, according to the present invention, a helical antenna that can be easily handled and that can suppress variations in antenna characteristics, and a method for manufacturing the helical antenna are provided.

It is a figure which shows the helical antenna which concerns on 1st Embodiment of this invention. It is a top view which shows the flexible wiring board of FIG. It is the figure which expanded a part of flexible wiring board of FIG. It is a flowchart which shows the procedure of the manufacturing method of the helical antenna of FIG. It is a figure which shows a mode that a flexible wiring board is wound around a core material. It is the figure which extracted a part of helical antenna which concerns on 2nd Embodiment of this invention. It is the figure which extracted a part of helical antenna which concerns on 3rd Embodiment of this invention. It is a figure which shows the helical antenna which concerns on 4th Embodiment of this invention. It is a top view which shows the flexible wiring board of FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a helical antenna and a method for manufacturing a helical antenna according to the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram showing a helical antenna according to the first embodiment of the present invention.

  As shown in FIG. 1, the helical antenna 1 of the present embodiment includes a core member 20 and a flexible wiring board 10 wound around the core member 20.

  The core material 20 has a cylindrical shape. The core material 20 is made of a dielectric. Examples of such a dielectric include ceramics such as alumina and ferrite, resins such as epoxy resins, polyethylene terephthalate (PET), and fluorine resins.

  FIG. 2 is a plan view of the flexible wiring board 10 of FIG. However, FIG. 2 is illustrated in a different scale from FIG. 1 for easy understanding. As shown in FIGS. 1 and 2, the flexible wiring substrate 10 includes a flexible substrate 11 and a linear antenna line 12 provided on the substrate 11 as main components.

  The substrate 11 is formed in a long shape, and the first fitting portion 13 is formed over the entire area of one side surface along the longitudinal direction of the substrate 11, and the second fitting portion 14 is formed over the entire area of the other side surface. Is formed. That is, a part of the outer periphery of the substrate 11 is the first fitting part 13, the other part is the second fitting part 14, and the first fitting part 13 and the second fitting part 14 face each other. is doing. Both the first fitting portion 13 and the second fitting portion 14 are formed in a stepped shape having a plurality of step portions, and the first fitting portion 13 and the second fitting portion 14 respectively. The step portions have the same width and the same height.

  The material of the substrate 11 is not particularly limited, and examples thereof include resins such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polyimide (PI).

  The antenna line 12 is linearly provided on the substrate 11 so that one conductor is positioned between the first fitting portion 13 and the second fitting portion 14 of the substrate 11.

  Such an antenna line 12 is made of, for example, metal plating, conductive paste, a rectangular conductive wire, or the like. When the antenna line 12 is made of metal plating or a rectangular conductor, the material of the metal plating or the rectangular conductor is not particularly limited. For example, a metal such as copper (Cu), nickel (Ni), or aluminum (Al) Can be mentioned. When the antenna line 12 is made of a conductive paste, examples of the conductive paste include various metal pastes such as silver paste, carbon paste, and the like.

  The substrate 11 and the antenna line 12 are covered with a protective layer made of resin (not shown). When the antenna line 12 is made of metal plating or conductive paste, the protective layer is not particularly limited. For example, the antenna layer 12 is a resin layer coated with a resin layer made of polyimide or a resin layer to which a resin film is attached. When the antenna line 12 is composed of a rectangular conducting wire, the protective layer is not particularly limited. For example, a resin layer made of the same resin as the substrate 11 is bonded.

  In addition, one end of the antenna line 12 is exposed from a protective layer covering the antenna line 12 in a region surrounded by a broken line, and serves as a power feeding terminal 15 formed of a part of the antenna line 12. ing.

Next, the 1st fitting part 13 and the 2nd fitting part 14 are demonstrated in detail. FIG. 3 is an enlarged view of a part of the flexible wiring board 10 of FIG. As shown in FIG. 3, in the 1st fitting part 13 and the 2nd fitting part 14, the width | variety of each step part is set to x, height is set to y, and the outer diameter of the core material 20 is set to 2r. In case
x = 2πr / t
It is said. However, t is the first fitting portion 13 and the second fitting formed in one turn of the flexible wiring board 10 in a state where the flexible wiring board 10 is wound around the core member 20 as shown in FIG. The number of step portions of the joint portion 14 is shown.

Furthermore, as shown in FIG. 3, when the antenna line 12 is at an angle α with respect to the width direction of each step portion in the first fitting portion 13 and the second fitting portion 14, Height y is
y = xtanα
It is said. In the above, the thickness of the substrate 11 is ignored.

  Further, as shown in FIG. 2, both end portions of the substrate 11 are formed in parallel to the width direction of each step portion, and the width is 2πr. Therefore, as shown in FIG. 1, since the end portion of the substrate 11 goes around in a state where the flexible wiring substrate 10 is wound around the core material 20, the flexible wiring substrate 10 can be wound without a gap from the end portion of the core material 20. it can.

  Then, as shown in FIG. 1, the flexible wiring board 10 is wound around the core member 20 so that the antenna line 12 has a spiral shape, thereby forming the helical antenna 1. In the helical antenna 1, the flexible wiring substrate 10 is spirally wound around the core member 20 so that the antenna line 12 has a spiral shape with an angle α with a plane perpendicular to the longitudinal direction of the core member 20. The respective step portions of the first fitting portion 13 and the respective step portions of the second fitting portion 14 are fitted to each other without any gap. In other words, if the flexible wiring board 10 is wound around the core material 20 so that the first fitting portion 13 and the second fitting portion 14 are fitted with no gap, the antenna line 12 is A constant angle α is formed in a plane perpendicular to the longitudinal direction of the material 20, and a spiral shape having a constant diameter 2r is formed.

  As described above, according to the helical antenna 1 of the present embodiment, the first fitting portion 13 and the second fitting portion formed on the outer periphery of the substrate 11 in the state where the flexible wiring substrate 10 is wound around the core member 20. Since the fitting portion 14 is fitted, the relative position between a part of the outer periphery of the substrate 11 and the other part of the outer periphery is uniquely determined. Therefore, the variation in the winding method of the flexible wiring board 10 is suppressed. In this way, the antenna line 12 is suppressed from being spirally wound around the core member 20, and variations in antenna characteristics are suppressed. In addition, since the first fitting portion 13 and the second fitting portion 14 are fitted as described above and the winding method of the flexible wiring board 10 is determined, it is necessary to form a protrusion or the like on the core material 20. It is easy to handle.

  In addition, according to the helical antenna 1, the flexible wiring board 10 wound in a spiral has one antenna line 12, and therefore there is no connection portion in the antenna line 12, and better antenna characteristics can be obtained. Can do. Further, the first fitting portion 13 and the second fitting portion 14 are formed on the opposite sides of the antenna line 12, so that the first fitting is performed when the flexible wiring board 10 is spirally wound. The part 13 and the second fitting part 14 can be fitted. Therefore, variations in antenna characteristics due to variations in the winding method of the antenna line 12 can be suppressed.

  Next, a method for manufacturing the helical antenna 1 shown in FIG. 1 will be described.

  FIG. 4 is a flowchart showing a procedure of a method for manufacturing the helical antenna 1 of FIG. As shown in FIG. 4, the method for manufacturing the helical antenna 1 includes a preparation process P <b> 1 for preparing the core material 20 and the flexible wiring board 10, and an assembly process P <b> 2 for winding the flexible wiring board 10 around the core material 20.

(Preparation process P1)
First, the core material 20 and the flexible wiring board 10 are prepared. The core material 20 is obtained by shaping the material of the core material 20 so as to have the shape of the core material 20. For example, when the core material 20 is made of ceramic, the core material 20 is obtained by molding a material that becomes the core material 20 and then sintering the material. Or when the core material 20 consists of resin, the core material 20 is obtained by metal mold-molding the material used as the core material 20. FIG. Even when the core material 20 is made of other materials, the core material 20 is obtained by appropriately molding the material to be the core material 20.

  The flexible wiring board 10 is obtained by providing the antenna line 12 on the board 11 and molding the outer diameter of the board 11 so as to have the first fitting part 13 and the second fitting part 14. Examples of the molding of the substrate 11 include molding by punching. Note that the substrate 11 may be formed before the antenna line 12 is provided on the substrate 11.

  When the antenna line 12 is made of metal plating, the antenna line 12 is provided by plating the antenna line 12 on the substrate 11. When the antenna line 12 is made of a conductive paste, the antenna line 12 is provided by applying the conductive paste on the substrate 11 and drying the conductive paste as necessary. Thus, after providing the antenna line 12 with metal plating or conductive paste, a protective layer is provided as necessary. The protective layer is not particularly limited, but is provided by applying a resin to solidify it or attaching a resin film. When the antenna line 12 is formed of a flat conductive wire, the flat conductive wire is laminated by the substrate 11 and the protective layer, and the flat conductive wire is fixed on the substrate 11. In addition, you may fix a flat conducting wire on a board | substrate by another means. Note that an adhesive (not shown) is preferably provided on the back surface of the flexible wiring board 10 in order to fix the flexible wiring board 10 to the core material.

(Assembly process P2)
Next, the flexible wiring board 10 is spirally wound around the core material 20. FIG. 5 is a diagram illustrating a state where the flexible wiring board 10 is wound around the core member 20.

  In the assembly process P2, first, one end of the flexible wiring board 10 is fixed to the core member 20 by means not shown. In the case where an adhesive is provided on the back surface of the flexible wiring board 10, the end of the flexible wiring board 10 is fixed to the core member 20 with the adhesive. Next, the flexible wiring board 10 is spirally wound around the core member 20 so that the first fitting portion 13 and the second fitting portion 14 are fitted to each other. That is, the flexible wiring board 10 is wound around the core member 20 so that the first fitting portion 13 and the second fitting portion 14 are in contact with each other without a gap. In this way, the flexible wiring board 10 is spirally wound around the core member 20 so that the first fitting portion 13 and the second fitting portion 14 are fitted to each other, whereby the antenna line 12 becomes the core member 20. An angle α is formed on a plane perpendicular to the longitudinal direction, and a spiral shape having a diameter of 2r is formed.

  And the helical antenna 1 shown in FIG. 1 is obtained by winding the flexible wiring board 10 to the last.

  As described above, according to the method for manufacturing the helical antenna 1 of the present embodiment, when the flexible wiring substrate 10 is wound around the core member 20, the first fitting portion 13 and the second fitting portion 13 formed on the outer periphery of the substrate 11. Since the fitting part 14 is fitted, the relative position between a part of the outer periphery of the substrate 11 and the other part of the outer periphery can be uniquely determined. Therefore, the flexible wiring substrate 10 can be prevented from being scattered and wound around the core material 20. Thus, the antenna line 12 can be suppressed from being spirally wound around the core member 20, and the helical antenna 1 in which variations in antenna characteristics are suppressed can be manufactured. Moreover, since the winding method of the flexible wiring board 10 is determined by fitting the first fitting portion 13 and the second fitting portion 14, there is no need to form protrusions and the helical antenna 1 that is easy to handle. Can be manufactured.

  Further, by winding the long flexible wiring board 10 around the core material 20 in a spiral shape, the antenna line 12 can be easily wound in a spiral shape. At this time, the 1st fitting part 13 and the 2nd fitting part 14 are formed by the 1st fitting part 13 and the 2nd fitting part 14 being mutually formed with respect to the track | line 12 for antennas. Can be fitted. Therefore, variations in antenna characteristics due to variations in the winding method of the antenna line can be suppressed. Furthermore, since the antenna line 12 is one and the antenna line 12 has no connection portion, it is not necessary to connect the antenna lines. Therefore, it is not necessary to adjust the connection between the antenna lines, and the helical antenna 1 in which variations in antenna characteristics are easily suppressed can be manufactured.

  Moreover, since the 1st fitting part 13 and the 2nd fitting part 14 are formed in the staircase shape which has several step part of the same width and the same height, it is not necessary to insert each fitting part intricately In the assembly process P2, it is easy to fit the first fitting portion 13 and the second fitting portion 14 together. Therefore, the helical antenna 1 in which variations in antenna characteristics are easily suppressed can be manufactured.

(Second Embodiment)
Next, a second embodiment of the present invention will be described in detail with reference to FIG. In addition, about the component which is the same as that of 1st Embodiment, or an equivalent component, the overlapping description is abbreviate | omitted except the case where it attaches | subjects the same referential mark and demonstrates in particular. FIG. 6 is a diagram in which a part of a helical antenna according to the second embodiment of the present invention is extracted.

  As shown in FIG. 6, the helical antenna of this embodiment is different from the helical antenna 1 of the first embodiment in that the first fitting portion 13 and the second fitting portion 14 are formed in an uneven shape. And different. The first fitting portion 13 and the second fitting portion 14 are each formed with a convex portion and a concave portion, and the first fitting portion 13 is in a state in which the flexible wiring board 10 is spirally wound around the core member 20. The convex part of the part 13 enters the concave part of the second fitting part 14 without a gap, and the convex part of the second fitting part 14 enters the concave part of the first fitting part 13 without a gap. As described above, when the first fitting portion 13 and the second fitting portion 14 are fitted with no gap, the antenna line 12 is in the longitudinal direction of the core member 20 as in the helical antenna 1 of the first embodiment. Is formed in a spiral shape having a constant diameter 2r and a constant angle α.

  In order to obtain the helical antenna of the present embodiment, the outer diameter of the substrate 11 may be formed so that the shapes of the first fitting portion 13 and the second fitting portion 14 are uneven in the preparation step P1. And in the assembly process P2, when winding the flexible wiring board 10 around the core material 20, the convex part of the 1st fitting part 13 enters into the recessed part of the 2nd fitting part 14 without gap, and the 2nd fitting part 14 of FIG. What is necessary is just to make it a convex part enter into the recessed part of the 1st fitting part 13 without gap. By doing so, the antenna line 12 is formed in a spiral shape having a constant angle 2r and a constant diameter 2r in a plane perpendicular to the longitudinal direction of the core member 20.

  According to the helical antenna and the manufacturing method of the helical antenna according to the present embodiment, the first fitting portion 13 and the second fitting portion 14 are each formed with an uneven shape, and the first fitting portion 13 and the second fitting portion are formed. Since the portion 14 is fitted, the relative positions of the first fitting portion and the second fitting portion are suppressed from shifting in the depth direction and the width direction of the uneven shape, and more accurately. The flexible wiring board 10 can be wound around the core member 20, and a helical antenna with less variation can be obtained.

(Third embodiment)
Next, a third embodiment of the present invention will be described in detail with reference to FIG. In addition, about the component which is the same as that of 1st Embodiment, or an equivalent component, the overlapping description is abbreviate | omitted except the case where it attaches | subjects the same referential mark and demonstrates in particular. FIG. 7 is a diagram in which a part of a helical antenna according to the third embodiment of the present invention is extracted.

  As shown in FIG. 7, the helical antenna of the present embodiment is such that the first fitting portion 13 and the second fitting portion 14 are such that the flexible wiring board 10 is wound around the core material 20 in a spiral manner. Of course, it differs from the helical antenna 1 of the first embodiment in that one is formed.

  In order to obtain the helical antenna of the present embodiment, in the preparation step P1, one first fitting portion 13 and second fitting portion 14 are provided for a length (2πr) of one turn of the core member 20. Thus, the outer diameter of the substrate 11 may be formed. Then, in the assembly process P2, when the flexible wiring board 10 is wound around the core member 20, the first fitting portion 13 and the second fitting portion 14 may be fitted at only one place per round. By doing so, the antenna line 12 is formed in a spiral shape having a constant angle 2r and a constant diameter 2r in a plane perpendicular to the longitudinal direction of the core member 20.

  According to the helical antenna and the manufacturing method of the helical antenna according to the present embodiment, since there are few places to be fitted, the labor of fitting is small, the configuration can be simplified, and the helical antenna can be easily manufactured. .

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described in detail with reference to FIG. In addition, about the component which is the same as that of 1st Embodiment, or an equivalent component, the overlapping description is abbreviate | omitted except the case where it attaches | subjects the same referential mark and demonstrates in particular. FIG. 8 is a diagram showing a helical antenna 2 according to the fourth embodiment of the present invention.

  As shown in FIG. 8, in the helical antenna 2 of this embodiment, the width of the substrate 11 of the flexible wiring board 30 is substantially the same as the length of the core material 20, and the flexible wiring board 30 is the length of the core material 20. It differs from the helical antenna 1 of the first embodiment in that it is wound in a direction perpendicular to the vertical direction.

  FIG. 9 is a plan view of the flexible wiring board 30 of FIG. As described above, the width of the substrate 11 is substantially the same as that of the core member 20. And the 1st fitting part 13 is formed in one edge part of the longitudinal direction of the board | substrate 11, and the 2nd fitting part 14 is formed in the other edge part. That is, a part of the outer periphery of the substrate 11 is the first fitting part 13, the other part is the second fitting part 14, and the first fitting part 13 and the second fitting part 14 face each other. is doing. This longitudinal direction is a direction that becomes a circumferential direction in a state of being wound around the core member 20. The first fitting portion 13 and the second fitting portion 14 have an uneven shape, and in the direction along the longitudinal direction of the substrate 11, the convex portion of the first fitting portion 13 and the second fitting portion 14. The distance from the end of the convex portion of the first fitting portion 13 to the bottom of the concave portion of the second fitting portion 14 is the same as the circumference of the core member 20. Therefore, in the state where the flexible wiring board 30 is wound around the core member 20 as shown in FIG. 8, the first fitting portion 13 is fitted so that the convex portion contacts the concave portion of the second fitting portion 14. . In FIG. 8, for easy understanding, a slight gap is provided between the first fitting portion 13 and the second fitting portion 14. On the other hand, the convex part of the 2nd fitting part 14 is formed longer than the convex part of the 1st fitting part 13, and as shown in FIG. 8, the convex part of the 1st fitting part 13 is 2nd fitting. In the state of fitting so as to be in contact with the concave portion of the joint portion 14, the portion surrounded by the broken line in FIG. 9 in the convex portion of the second fitting portion protrudes from the concave portion of the first fitting portion and overlaps the substrate 11. It is configured as follows.

  In addition, a plurality of linear antenna lines 12 are provided on the substrate 11 at predetermined intervals so as to be at an angle α with respect to the longitudinal direction of the substrate 11 and are covered with a protective layer (not shown). Yes. Therefore, in a state where the flexible wiring board 30 is wound around the core member 20, the antenna line 12 is set to an angle α with respect to a plane perpendicular to the longitudinal direction of the core member 20. In addition, each of the plurality of antenna lines 12 provided on the substrate 11 has one end portion of the other of the antenna lines 12 adjacent to each other in a state where the flexible wiring substrate 30 is wound around the core member 20. It is made to overlap with the end. The length of the overlapping antenna lines 12 is set to 1 / 4λ when the wavelength used by the helical antenna 2 is λ.

  In addition, a region surrounded by a broken line is exposed from the protective layer covering the antenna line 12 at the end of the antenna line 12 located at the end of the plurality of antenna lines 12. It is set as the terminal 15 for electric power feeding which consists of a part.

  In order to manufacture such a helical antenna 2, in the preparation step P1, the width of the substrate 11 is substantially the same as the length of the core member 20, and the first fitting is performed at one end in the longitudinal direction. The part 13 is formed, and the 2nd fitting part 14 should just be formed in the other edge part. A plurality of antenna lines 12 are provided at an angle α with respect to the longitudinal direction of the substrate 11. Next, in the assembly process P2, the first fitting portion 13 and the second fitting portion 14 are fitted so that the convex portion of the first fitting portion 13 and the concave portion of the second fitting portion 14 are in contact with each other. Then, the flexible wiring board 30 is wound around the core material 20. In this way, each of the plurality of antenna lines 12 has one end portion that overlaps with the other end portion of the adjacent antenna line 12 by ¼λ to form one antenna line.

  As mentioned above, although this invention was demonstrated to the 1st-4th embodiment as an example, this invention is not limited to these.

  For example, the core member 20 has a cylindrical shape. That is, the shape perpendicular to the longitudinal direction of the outer peripheral surface of the core member 20 is circular, but the present invention is not limited to this, and the core member 20 has a polygonal shape perpendicular to the longitudinal direction of the outer peripheral surface. May be.

  Furthermore, in 1st-4th embodiment, the 1st fitting part 13 and the 2nd fitting part 14 may be another shape if it is a shape which mutually fits.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the helical antenna which can be handled easily and can suppress the dispersion | variation in antenna characteristics and a helical antenna are provided.

DESCRIPTION OF SYMBOLS 1, 2 ... Helical antenna 10 ... Flexible wiring board 11 ... Board 12 ... Antenna line 13 ... 1st fitting part 14 ... 2nd fitting part 15 ... Terminal 20 ... Core material 30 ... Flexible wiring board P1 ... Preparation process P2 ... Assembly process

Claims (9)

A flexible substrate, and a flexible wiring substrate having an antenna line provided on the substrate;
A core material around which the flexible wiring board is wound;
With
A first fitting part is formed on a part of the outer periphery of the substrate, and a second fitting part is formed on the other part of the outer periphery,
The flexible wiring board is wound around the core material such that the antenna line is spiral, and the first fitting portion and the second fitting portion are fitted to each other. A helical antenna. The antenna line is linearly provided on the substrate,
The substrate has a long shape along the longitudinal direction of the antenna line, and the first fitting part and the second fitting part are formed on opposite sides of the antenna line. Has been
The helical antenna according to claim 1, wherein the flexible wiring board is spirally wound around the core member.   The helical antenna according to claim 2, wherein the first fitting portion and the second fitting portion have a stepped shape having a plurality of step portions having the same width and the same height, respectively.   The helical antenna according to claim 2, wherein each of the first fitting portion and the second fitting portion has an uneven shape. A flexible board, and an antenna line provided on the board; a first fitting portion is formed on a part of the outer periphery of the board; While preparing the flexible wiring board in which 2 fitting parts are formed, the preparatory process which prepares a core material,
An assembly step of winding the flexible wiring board around the core material so that the antenna line is spiral, and fitting the first fitting portion and the second fitting portion together;
A method for manufacturing a helical antenna. The antenna line is linearly provided on the substrate,
The substrate has an elongated shape along the longitudinal direction of the antenna, and the first fitting portion and the second fitting portion are formed on opposite sides of the antenna line. And
6. The method of manufacturing a helical antenna according to claim 5, wherein in the assembling step, the flexible wiring board is spirally wound around the core member.   The helical antenna according to claim 6, wherein the first fitting portion and the second fitting portion have a stepped shape having a plurality of step portions having the same width and the same height, respectively. Method.   The method for manufacturing a helical antenna according to claim 6, wherein each of the first fitting portion and the second fitting portion has an uneven shape.   The said 1st fitting part and the said 2nd fitting part are each formed in one place per length by which the said flexible wiring board is wound around the said core material spirally. The manufacturing method of the helical antenna of 6-8.

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