JPH09213528A - Choke coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a choke coil whose S/N ratio is made good and whose receiving sensitivity is enhanced by a structure wherein a sheetlike dielectric is arranged between terminals of the coil, a resin-made fixation base is divided into a base part and a base auxiliary part and the coupling part of the dielectric is formed at the base auxiliary part. SOLUTION: A choke coil for a glass antenna has a structure formed in such a way that an Ni-Zn-based cylindrical magnetic core 2 is inserted into, and passed through, a coil 1 on which a copper wire is stacked and wound to be tubular, that both ends of the coil 1 are connected to a metal terminal plate 5 and a metal plate 6 which are installed at a resin-made fixation base 20 which is composed of a base part 3 and of a base auxliary part 4 and that a sheetlike dielectric 7 is inserted between another metal terminal part 5 and another metal plate 6. By the structure, the sheetlike dielectric 7 can be inserted and installed between the metal terminal plate 5 and the metal plate 6 irrespective of the thickness of the sheetlike dielectric 7. Consequently, the choke coil functions as a high-impedance element in a high-frequency region due to the resonant action of the sheetlike dielectric, its noise attenuation amount is increased, and its receiving sensitivity is enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a choke coil for a glass antenna used to improve the receiving sensitivity of an on-vehicle radio or the like.

[0002]

2. Description of the Related Art Choke coils for glass antennas are
Attenuates noise in the high frequency range, improves the S / N ratio, and improves the receiving sensitivity of in-vehicle radios,
A coil obtained by stacking and winding a conductor wire in a cylindrical shape on a Ni—Zn columnar magnetic core is installed on a resin-made fixing base, and the coil is provided on two metal plates provided on the resin-made fixing base. Both ends of are connected by soldering, and the receiving sensitivity is improved only by the frequency characteristics of the coil.

[0003]

As described above, the conventional choke coil for a glass antenna attenuates noise in a high frequency region due to the frequency characteristic of the coil using a Ni—Zn columnar magnetic core. It was intended to improve the reception sensitivity of in-vehicle radios.

However, there is a limit to the amount of noise attenuation due to only the frequency characteristic of the coil, and therefore there is a limit to improving the receiving sensitivity of the vehicle radio.

The technical problem of the present invention is to provide a choke coil for a glass antenna, which has a structure in which the amount of noise attenuation is further increased and the assembly is easy as compared with the prior art in order to eliminate the above-mentioned drawbacks. Especially.

[0006]

A plate-shaped dielectric is inserted between a metal terminal plate and a metal plate provided on a resin-made fixing base of the present invention, and a coil having a magnetic core inserted therethrough and the plate. Antenna which has a structure in which a sheet-shaped dielectric is electrically connected in parallel, and the plate-shaped dielectric has a greater amount of noise attenuation in a high-frequency region than the conventional case, and improves the reception sensitivity of an in-vehicle radio. It becomes a choke coil for.

That is, according to the present invention, a coil formed by stacking a conductor wire in a cylindrical shape on a columnar magnetic core and winding the conductor wire is installed on a resin-made fixing base,
In a choke coil in which both ends of the coil winding are connected to a metal terminal plate provided on the resin-made fixing base, a dielectric is provided between the metal terminal plate and the metal plate. It is a characteristic choke coil.

In the choke coil according to the present invention, the resin-made fixing base comprises a base portion and a base auxiliary portion, and the dielectric member is provided on a surface of the base auxiliary portion facing the base portion. Is a choke coil having a structure in which an engaging portion for engaging with is provided.

(Operation) A choke coil for a glass antenna according to the present invention is a plate-shaped dielectric member between a metal terminal plate and a metal plate provided on a resin-made fixing base composed of a base portion and a base auxiliary portion. Is provided, and the coil in which the magnetic core is inserted and the plate-shaped dielectric are electrically connected in parallel.

The resonance frequency of the plate-shaped dielectric has a characteristic determined by the thickness of the plate-shaped dielectric. Therefore, in order to resonate at an arbitrary frequency, it is necessary to change the thickness.

Therefore, even if the thickness of the plate-shaped dielectric changes, the base auxiliary portion is engaged so that the plate-shaped dielectric can be inserted into the metal terminal plate and the metal plate. It has a structure with parts.

With this structure, due to the resonance action of the plate-shaped dielectric body, it becomes a high impedance element in a high frequency region, a large amount of noise attenuation can be obtained, the S / N ratio of a vehicle radio, etc. is improved, and the receiving sensitivity Can be improved.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. 1, 2 and 3.

FIG. 1 is an explanatory view of a choke coil for a glass antenna according to the present invention. FIG. 1 (a) is a perspective view and FIG.
(B) is a plan view. FIG. 2 is a perspective view of the base portion 3 of the choke coil for glass antenna of the present invention. FIG. 3 is a perspective view of the base auxiliary portion 4 of the choke coil for a glass antenna of the present invention.

As shown in FIG. 1, a choke coil for a glass antenna according to the present invention is formed by stacking copper wires in a cylindrical shape, and inserting a wound coil 1 into which a Ni—Zn-based cylindrical magnetic core 2 is inserted. , Both ends of the coil 1 are connected to a metal terminal plate 5 and a metal plate 6 provided on a resin-made fixing base 20 composed of a base portion 3 and a base auxiliary portion 4, and a plate-shaped dielectric 7 is attached to the metal terminal plate 5 It is a structure inserted between the metal plate 6 and the metal plate 6.

Further, as shown in FIG. 2, the base portion 3 is formed with a convex portion 8 having a hole 12 for inserting a metal terminal plate on the front surface, and the base portion 3 and the metal plate are formed in the center. , And a through hole 9 for passing a screw connecting the base auxiliary portion.

Further, as shown in FIG. 3, the base assisting portion 4 is provided with an engaging portion 10 for closely adhering a plate-shaped dielectric between the metal terminal plate and the metal plate, and further at the center. Has a hole 11 for connecting the base auxiliary portion 4, the metal plate, and the base portion.

With this structure, the plate-shaped dielectric 7 can be reliably inserted into the metal terminal plate 5 and the metal plate 6 regardless of the thickness of the plate-shaped dielectric 7, and the base portion 3 is also provided. The metal plate 6 and the base auxiliary portion 4 can be fixed with screws.

Therefore, due to the resonance action of the plate-shaped dielectric,
In the high frequency region, the choke coil for the glass antenna functions as a high impedance element, so that a large amount of noise attenuation is obtained, the S / N ratio of a vehicle-mounted radio is improved, and the reception sensitivity can be improved. it can.

[0020]

As described above, according to the present invention, the plate-shaped dielectric is disposed between the terminals of the coil, the resin-made fixing base is divided into the base portion and the base auxiliary portion, and the base auxiliary portion is dielectrically insulated. By providing the body engagement portion, the S / N ratio of a vehicle radio can be improved, the receiving sensitivity can be improved, and the choke coil can be easily assembled and is inexpensive. You can

[Brief description of drawings]

FIG. 1 is an explanatory view showing a choke coil for a glass antenna of the present invention. FIG. 1A is a perspective view. FIG. 1B is a plan view.

FIG. 2 is a perspective view of a base portion of a choke coil for a glass antenna according to the present invention.

FIG. 3 is a perspective view of a base auxiliary portion of a choke coil for a glass antenna according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 coil 2 (cylindrical) magnetic core 3 base part 4 base auxiliary part 5 metal terminal plate 6 metal plate 7 (plate-shaped) dielectric 8 convex part 9 through hole 10 engaging part 11, 12 hole 20 (made of resin Fixed base

Claims (2)

[Claims] 1. A coil in which a conductor wire is cylindrically laminated and wound around a columnar magnetic core is installed on a resin-made fixing base, and the coil is provided on a metal terminal plate and a metal plate provided on the resin-made fixing base. A choke coil in which both ends of the winding are connected, wherein a dielectric is provided between the metal terminal plate and the metal plate. 2. The choke coil according to claim 1, wherein the resin fixing base includes a base portion and a base auxiliary portion, and the dielectric member is provided on a surface of the base auxiliary portion facing the base portion. A choke coil having a structure in which an engaging portion for engaging with is provided.