JP4339105B2 - Loop antenna - Google Patents

Description

  The present invention relates to a loop antenna formed by annularly winding an antenna conductor around a frame.

In general, a bar antenna is used as an antenna of an electronic device that receives a radio broadcast or the like. However, there are many cases where the reception condition is poor because the transmission output of the broadcasting station is small or the building where the receiver resides is a reinforcing bar. In that case, the reception condition improves by installing the antenna near the window or outdoors. Is done.
If the receiving device is small and portable, the antenna can be moved together with the device. However, in the case of a system component stereo or a stationary receiving device, it is difficult to install these devices along with the antenna near the window or outdoors.
In such a case, a loop antenna may be connected to the device and installed near the window or outdoors.

  As a configuration example of the loop antenna, a ring-shaped frame portion, a support portion connected to the frame portion via a hinge and integrally formed by molding, and an antenna attached to the frame portion An engagement state in which the support portion is arranged as a single plate in the ring of the frame portion in a state where the hinge is not bent, and the frame portion is erected on the support portion in a state where the hinge is bent There has been proposed a loop antenna in which an interengaging portion that takes the shape is provided on the frame portion and the support portion (Patent Document 1).

Although the loop antenna has a simple structure in which conductors are arranged in a ring shape, in order to improve the directivity and frequency characteristics of the antenna and to obtain a large gain, the area surrounded by the conductor arranged in the ring and the winding of the conductor It is necessary to adjust the number and spacing between conductors.
It is known that when the conductor is wound around the frame portion, the antenna characteristics are improved, for example, when the conductors are spaced apart from each other so that the line capacitance decreases and the self-resonance frequency increases. For this reason, conventionally, the outer periphery of the frame portion formed by molding is formed in a concave shape, and a vinyl-coated wire having an appropriate thickness is fitted into the concave portion to obtain a constant conductor interval and the number of turns. Further, since the frame body and the support portion are integrally formed, only one molding die is required, the manufacturing cost is relatively low, and the assembly can be easily performed because the mutual engagement portion is provided.

  On the other hand, a vinyl-coated wire is a multi-core wire that is relatively expensive. Furthermore, since the vinyl-coated wire wound around the frame portion has a considerable length, the ratio of the cost of the vinyl-coated wire to the loop antenna is very high, which hinders cost reduction.

However, in order to wind at a predetermined interval in order to maintain the antenna characteristics using a low-cost single-core wire, an insulating means or an interval maintaining means for maintaining the interval is required. Depending on the members and the number of man-hours for the assembly process, the cost may increase as a whole. Furthermore, considerable countermeasures are required for protection of the lead wire connecting portion.
Reality 7-41205

  It is an object of the present invention to provide a loop antenna that can be manufactured at a lower cost using a single-core conductor without compromising the directivity, frequency characteristics, and gain of the antenna, and while maintaining the simplicity of assembly of a conventional loop antenna. Is to provide.

In order to solve the above-described problem, as described in claim 1, a frame formed in an annular shape and a pedestal integrally connected to the frame through an intermediate portion provided with two hinges, A lead wire mounted on the frame body, and an engagement portion provided on one side of the frame body and the pedestal and an engaged portion provided on the other side are engaged by bending the hinge, and the frame is formed by the pedestal. In a loop antenna having an interengaging portion for maintaining a state in which the body is supported, a spiral groove for mounting a conductive wire is provided on the outer peripheral portion of the frame body, and the depth and width of the groove is a single-core wire without insulation coating The conductive wire is formed to be larger than the thickness of the conductive wire, and one of the conductive wires is inserted into the groove and spirally wound around the groove at the same pitch as the groove. The section is formed to be inclined, and the sections other than the section are formed in parallel to the frame body, and the frame body A connecting portion that connects a lead wire connected to an electronic device and an end portion of the conducting wire is formed on the side surface of the frame, and a hinged protective member that covers the connecting portion is formed integrally with the frame. A characteristic loop antenna.

  According to a second aspect of the present invention, a connecting portion that connects a lead wire connected to an electronic device and an end portion of the conducting wire is formed on a side surface of the frame, and a hinged protective member that covers the connecting portion is formed. The loop antenna according to claim 1, wherein the loop antenna is formed integrally with the frame.

The loop antenna according to claim 2, wherein the protection member is integrally formed with an engaging portion that can be engaged and fixed to the frame body at a position that covers the connecting portion. .

As described in claim 1, a spiral groove for mounting a conductor is provided on the outer peripheral portion of the annularly formed frame, and the depth and width of the groove is larger than the thickness of the conductor of the single core wire without insulation coating. formed and, while along the groove fitted to the conductor of one in the groove in the same pitch as the groove that is wound helically, be insulated hold no insulating coating single-core wire at predetermined intervals it can. Therefore, it is possible to reduce the manufacturing cost by using a cheaper single-core wire as a conductor without losing the characteristics and gain of the antenna by a simple winding operation without requiring a special holding member or the like.
In addition, a spiral groove for conducting wires is provided in the outer peripheral portion of the frame body, and a predetermined section of the outer peripheral portion of the frame body is inclined and formed in the groove, and the other sections are formed in parallel to the frame body. Thus, a simple molding die is sufficient, and the manufacturing process can be simplified because the mold can be easily removed during molding, and the manufacturing cost can be reduced.

  The connection part which connects the lead wire connected to an electronic device and the edge part of the said conducting wire is formed in the side surface of a frame as described in Claim 2, and a protection member is integrated with a frame via a hinge. Since it is formed, a single molding die is sufficient, so that the manufacturing process is simple. Further, the protective member covers and protects the connecting portion, and the conductor is prevented from being short-circuited by dust or the conductor is disconnected.

As described in claim 3, the engagement portion that can be engaged and fixed to the frame body at a position covering the connection portion is formed integrally with the protection member, so that no special covering member is required and special assembly is performed. Assembling can be easily performed only by bending the hinge without processing .

Embodiments of a loop antenna according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a loop antenna according to the present invention.
The loop antenna 1 includes a frame body 2, a base portion 3, a conductive wire 4, and a protection member 6. The base part 3 and the protection member 6 are connected to the inner peripheral edge of the frame body 2 via a hinge, and the frame body 2, the base part 3, and the protection member 6 are integrally formed by molding.

  The frame 2 is annular, and its outer periphery is formed in a concave shape. A groove 7 is provided in a spiral in the concave portion. The groove 7 is provided in parallel to the outer peripheral direction of the frame body 2 and is inclined only in the inclined section C sandwiched between broken lines as shown in FIG. 2 and connected to the adjacent groove 7. Adjacent grooves 7 and grooves 7 are formed at a predetermined interval (pitch B). For example, the interval of pitch B is about 1.5 mm, and the width of groove 7 is about 0.5 mm.

  The base part 3 includes an intermediate part 10 and a base 11. The intermediate part 10 and the protection member 6 are connected to the first hinge 13. The intermediate portion 10 is a U-shaped plate-like body and is connected to the inner peripheral side edge of the frame body 2 at the tip portions of the two arm portions so as to surround the protective member 6. An engaging protrusion 8 is provided on one side of the protective member 6, and an engaging protrusion 8 and a notch 19 are provided on the opposite side. The pedestal 11 is connected to the other side edge portion of the intermediate portion 10 connected to the first hinge 13 via the second hinge 14.

  A winding portion 12 and an engaging claw portion 17 are provided on a side edge portion of the outer periphery corresponding to one side edge of the inner periphery where the first hinge 13 is provided. Cuts are provided at two positions on both the left and right sides of the substantially central portion of the engaging claw portion 17, and a plate-like winding portion 12 is provided so as to protrude from the cut. The receiving holes 9 are provided on the left and right sides of the winding part 12, and the engaging protrusions 8 provided on the protection member 6 are engaged with the receiving holes 9. In addition, a receiving groove portion 18 serving as an engaged portion of the engaging claw portion 17 is provided at a corresponding portion of the base 11.

  FIG. 3 is an enlarged view of the main part of A in FIG. The winding portion 12 is wound with the start and end portions of the conducting wire 4 and the lead wire 5 connected to the electronic device. The insulating film of the conducting wire 4 is peeled off before soldering. In this embodiment, a shield wire is used as the lead wire 5, and the coating of the shield wire is peeled off, and the core wire 15 and the mesh wire 16 are wound around the winding portion 12 and soldered.

  The protection member 6 is integrally connected to the frame body 2 via the first hinge 13. The first hinge 13 is bent to engage the engaging protrusion 8 with the receiving hole portion 9, and the protection member 6 is covered with the solder connection portion A to protect the solder connection portion A. The lead wire 5 is drawn into the inside through the notch 19.

As shown in FIG. 4, when the first hinge 13 and the second hinge 14 are not bent, the base 3 and the protection member 6 are projected in the ring of the frame 2 as a single plate-like body. The frame 2, the base 3, the protection member 6, the first hinge 13, and the second hinge 14 are integrally formed by molding. At the time of assembly, the first hinge 13 and the second hinge 14 are bent.
As shown in FIG. 5, the frame body 2 around which the conductive wire 4 is wound is erected by the pedestal 3, and the first hinge 13 and the second hinge 14 are bent to engage with the frame body 2. This is maintained in a state where the claw portion 17 is engaged with the receiving groove portion 18 provided in the base 11.

By providing the groove 7 that spirally winds around the outer periphery of the frame body 2 at a predetermined interval (pitch B), for example, a tin-plated copper wire, which is cheaper than the conventionally used vinyl-coated wire, is used as the conductor 4. Even if it is used, a predetermined conductor interval and number of turns can be obtained, and the manufacturing cost can be greatly reduced without impairing the characteristics and gain of the loop antenna 1.
In addition, since the inclined section C of the groove 7 is a constant section on the outer periphery of the frame body 2, the mold can be easily removed at the time of molding, and a relatively simple mold is sufficient. Cost can be reduced.

  A solder connection portion A is provided on a side surface of the frame body 2, a protection member 6 is connected to an inner peripheral side edge of the frame body 2 corresponding to the solder connection portion A, and an engagement protrusion 8 is provided on the protection member 6. By providing the receiving hole portion 9 on the side surface of the body 2, the protective member 6 is covered and protected by the solder connection portion A, and the lead wire 4 is short-circuited by dust or the like, or the lead wire 4 is disconnected due to an impact or the like. In addition, the appearance can be improved by shielding the solder connection portion A from the outside so as not to be seen.

  In addition to the frame 2, the base 3, the first hinge 13, and the second hinge 14, the protective member 6 is integrally formed by molding, so that only one molding die and a relatively simple one are sufficient. Therefore, the manufacturing process can be simplified and the manufacturing cost can be reduced. Moreover, since it has an interengagement part, tools, such as a driver and a screw, are not required for an assembly, but it is simple.

The perspective view which shows the Example of the loop antenna based on this invention Example side view Part A enlarged view in FIG. The perspective view which shows the state which mounted | wore the protection member Side sectional view showing a state in which the frame is supported by the pedestal

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Loop antenna 2 Frame 3 Base part 4 Conductive wire 5 Lead wire 6 Protective member 7 Groove 8 Engagement protrusion 9 Receiving hole part 10 Intermediate part 11 Base 12 Winding part 13 1st hinge 14 2nd hinge 15 Core wire 16 Mesh line 17 Engagement claw part 18 Receiving groove part 19 Notch A Solder connection part B Pitch C Inclined section

Claims (3)

A frame body and a pedestal comprising: a frame body formed in an annular shape; a pedestal integrally connected to the frame body via an intermediate portion having two hinges; and a conductive wire attached to the frame body A loop having an interengagement portion that maintains the state in which the frame is supported by the pedestal by engaging the engagement portion provided on one side and the engaged portion provided on the other side by bending the hinge. In the antenna,
A spiral groove for mounting a conductive wire is provided on the outer peripheral portion of the frame, and the depth and width of the groove are formed to be larger than the thickness of a single core wire without insulation coating, and one of the above-mentioned conductive wires is formed in this groove. And spirally wound in the same pitch as the groove while fitting along the groove,
A loop antenna characterized in that a predetermined section of the outer peripheral portion of the frame body is formed to be inclined in the groove, and other sections are formed in parallel to the frame body.   Formed on the side surface of the frame body is a connecting portion that connects the lead wire connected to the electronic device and the end portion of the conducting wire, and a hinged protective member that covers the connecting portion is formed integrally with the frame body. The loop antenna according to claim 1, wherein   The loop antenna according to claim 2, wherein the protective member is integrally formed with an engaging portion that can be engaged and fixed to the frame body at a position covering the connecting portion.

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