JPH0936643A - Helical antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily comparatively fix and hold a coil, to facilitate the adjustment of a pitch, etc., and to stably obtain desired antenna characteristic. SOLUTION: This antenna is provided with the coil 2 formed spirally at a prescribed pitch, a cylindrical loading part 3 in which the coil 2 is out-fitted, and a holding board 4 fixed on both terminal parts of the loading part 3 and consisting of pedestal parts 4A, 4B. One terminal part 2b of the coil 2 is bent inward, and connected to a notch connecting part 5 provided in the loading part 3, and the other terminal part 2a of the coil 2 is connected to a connecting recessed part 6a formed on a connecting piece 6 provided in the pedestal part 4A, and afterwards, the coil is inserted to a wiring board 10, then, soldered on it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a helical antenna provided with a coil spirally wound at a predetermined pitch, and more particularly to an improved helical antenna mounted on a wiring board or the like.

[0002]

2. Description of the Related Art Conventionally, a helical antenna mounted on a wiring board has a structure as shown in FIGS. The helical antenna 11 shown in FIG. 5 has a pair of holders 15, each of which has one of winding parts near both ends of a coil 12 formed in a spiral shape with a predetermined pitch.
The coil 12 is supported and supported, and one end 12a of the coil 12 is pulled out to the outside in the radial direction and soldered and fixed to the wiring board 10 as a mounting terminal, and the other end 12b of the coil 12 is free.

In this structure, a wire having a high hardness such as iron is used as the wire for the coil 12,
The antenna characteristics are adjusted by adjusting the pitch of space winding of the coil 12 using pliers or the like,
The coil 12 and the holders 15 and 15 are fixed to each other by an adhesive or crimping and caulking.
5 is attached to the substrate 10 using an adhesive or the like.

On the other hand, the helical antenna 2 shown in FIG.
1 is a columnar mounting part 2 which does not use a forming coil
3 is spirally wound with a predetermined pitch, and after the winding is completed, both ends of the cylindrical mounting portion 23 are connected to the base portion 24.
The coil 22 wound around the mounting portion 23 at a predetermined pitch is fixed to the cylindrical mounting portion 23 by using an adhesive, and the one end portion of the coil 22 is fixed to the mounting portion 24a. 22a is drawn out to the outside in the radial direction and soldered and fixed to the wiring board 10 as a mounting terminal.

In this structure, a material having a low hardness is used as the wire material for the coil 22, and the antenna characteristics are adjusted by manually adjusting the pitch of space winding when the coil 22 is molded (when winding). The bases 24A and 24B are attached to the substrate 10 by using an adhesive or the like.

[0006]

However, in the above-described helical antenna 11 shown in FIG. 5, it takes time to fix and hold the coil 12 in the holder 15, and the coil 12 is adjusted and held. Ingredient 15
Even after the coil is held in place, the coils 12 and 22 are deformed by bending or swaying, the pitch is likely to change, and the antenna characteristic is unstable and there is a problem in reliability.

In the helical antenna 21 shown in FIG. 6 described above, the coil 22 has a cylindrical mounting portion 23.
Although the variation of the antenna characteristics is suppressed by adhesively fixing the coil 22 to the, the forming (winding) of the coil 22 performed by winding the wire around the columnar mounting portion 23 has a large variation in pitch, etc. It is difficult to obtain the characteristics, and the coil 22 once formed has a cylindrical mounting portion 2
Since it is fixed to No. 3 by adhesion, there is a problem that the antenna characteristics cannot be adjusted later.

The present invention has been made to solve the above-mentioned problems, and its purpose is to make it possible to fix and hold the coil relatively easily, and to easily adjust the pitch and the like. An object of the present invention is to provide a helical antenna capable of stably obtaining desired antenna characteristics.

[0009]

In order to achieve the above-mentioned object, a helical antenna according to the present invention comprises a coil wound in a spiral shape and a cylindrical or cylindrical mounting portion on which the coil is fitted. And a holding base composed of a base portion provided at an end portion of the mounting portion, and both ends of the coil are respectively locked to locking portions provided at the mounting portion and / or the base portion. It will be done.

As a more preferable specific example, one end of the coil is bent inward and locked by a notch locking portion provided on the mounting portion, and the other end of the coil is provided on the base portion. An example is one that is locked by the locked portion and is inserted into the wiring board.

In the helical antenna according to the present invention configured as described above, the coil formed in a spiral shape with a predetermined pitch in advance is provided with a cylindrical or cylindrical mounting portion and an end portion of this mounting portion. It is attached and fixed to a wiring board by being held and fixed by a holding base composed of a base portion provided in the.

[0012] Specifically, the coil is fitted onto the mounting portion, and both ends of the coil are locked to the locking portions provided on the mounting portion and / or the base.

By doing so, the coil can be fixed and held on the holding table very easily without any trouble, and the both ends of the coil are locked and fixed, so that the pitch adjustment can be performed. It is also possible to reduce the variation of the pitch easily, and it is also possible to prevent the coil from bending or deforming after the pitch adjustment, or to cause an undesired behavior. Can be obtained stably and reliably, and the reliability is improved.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the helical antenna according to the present invention. A helical antenna 1 shown in the drawing has a coil 2 formed in a spiral shape with a predetermined pitch as shown in detail in FIG. 2, a cylindrical mounting portion 3 on which the coil 2 is externally fitted, and this mounting portion. 3, holding bases 4 composed of base parts 4A and 4B fixed to both ends of the base plate 3.

Then, as shown in FIG. 3, one end portion 2b of the coil 2 is bent inward so that the mounting portion 3 is formed.
Is locked to the notch locking portion 5 provided on the base 2, and the other end 2a of the coil 2 is rotated from the position shown by the one-dot chain line in FIGS. It is adapted to be engaged with an engaging recess 6a formed in an engaging piece 6 attached to the portion 4A, and then inserted into the wiring board 10 and soldered as a mounting terminal.

In the helical antenna 1'shown in FIG. 4, one end 2b 'of the coil 2'is attached to the base 4B by being bent outward as indicated by the chain line in FIG. 2 (B). Locking recess 7a formed on the locking piece 7
It is locked to.

By doing so, the coil 2,
The 2'can be fixed and held on the holding table 4 very easily without any trouble, and since both ends of the coils 2 and 2'are locked and fixed, the pitch can be easily adjusted. , The variation in pitch can be reduced,
It is also possible to prevent the coils 2 and 2 ′ from being bent or deformed after the pitch adjustment or to cause undesired behavior, and it is possible to stably and surely obtain desired antenna characteristics, Improves reliability.

[0018]

As can be understood from the above description, the helical antenna according to the present invention can very easily fix and hold the coil on the holding base, and both ends of the coil are engaged. Since it is stopped and fixed, the pitch can be adjusted easily and the variation in the pitch can be reduced.Furthermore, after the pitch is adjusted, the coil may be bent or deformed, or cause undesired behavior. Can be prevented, desired antenna characteristics can be stably and reliably obtained, and reliability is improved.

[Brief description of drawings]

FIG. 1 shows an embodiment of a helical antenna according to the present invention, in which (A) is a side view and (B) is a sectional view.

2 shows a coil of the helical antenna shown in FIG. 1, (A) being a front view and (B) being a side view.

FIG. 3 is a diagram which is used for describing an assembling process of the helical antenna shown in FIG.

FIG. 4 shows another embodiment of the helical antenna according to the present invention, (A) is a side view, and (B) is a sectional view.

FIG. 5 shows an example of a conventional helical antenna, (A)
Is a side view, and (B) is a rear view.

FIG. 6 shows another example of a conventional helical antenna,
(A) is a side view and (B) is a rear view.

[Explanation of symbols]

 1 Helical Antenna 2 Coil 2a Other End 2b One End 3 Mounting Part 4 Holding Base 4A, 4B Base Part 5 Cutout Locking Part 6 Locking Piece 6a Locking Recess 10 Wiring Board

Claims (2)

[Claims] 1. A holding base comprising a coil wound in a spiral shape, a columnar or cylindrical mounting part on which the coil is fitted, and a base part provided at an end of the mounting part. A helical antenna comprising: a coil, wherein both ends of the coil are locked to locking parts provided on the mounting part and / or the base part, respectively. 2. One end of the coil is bent inward and locked by a notch locking part provided in the mounting part, and the other end of the coil is locked by the base part. The helical antenna according to claim 1, wherein the helical antenna is locked to and inserted into the wiring board.