JPH09167910A - Plane antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a plane antenna which is capable of eliminating a ring presser and a fixing piece and is easy in an assembling process. SOLUTION: In this antenna, the antenna assembling body 1 having a circuit board 1b on which an antenna element 1a and the accompanying circuit elements are mounted at the inside of the resin case composed of a bottom cover 2 and the top cover 4 covering the surface of this bottom cover 2 and an antenna cable 6 is introduced into the bottom cover 2 from the cable hole 7 formed on the peripheral wall of the bottom cover 2. At this time, the seal collar which is integrated into external coating is fixed at the introduction terminal 6a of the antenna cable 6, the tip part of the antenna assembling body 1 on the opposite side of the antenna cable 6 is abutted on the internal surface of the peripheral wall 2d of the bottom cover 2, the corresponding tip part of the antenna assembling body 1 is directly or indirectly applied on the seal collar 12 and the seal collar 12 is elastically deformed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar antenna used for GPS (Global Positioning System), and more particularly to a resin case sealing structure for housing a planar antenna element.

[0002]

2. Description of the Related Art As is well known, a planar antenna used in a global positioning system receives a radio wave from a GPS satellite and may be used by being mounted on, for example, a roof panel of an automobile. The antenna needs to be structured so that rainwater does not enter from the outside.

That is, FIGS. 4 to 6 show a conventional planar antenna, in which an antenna assembly 1A composed of an antenna element 1a, a circuit board 1b and a shield case 1c is placed in a housing chamber 3A of a resin-molded bottom cover 2A. The housing chamber 3A is shielded from the outside by a packing 5 which is remodeled between the annular wall 4a of the top cover 4A combined with the bottom cover 2A and the seat surface 2a of the bottom cover 2A.

By the way, in the planar antenna having such a structure, rainwater may enter from the introduction portion 6a of the antenna cable 6A connecting the above-mentioned circuit board and GPS device. The structure shown in FIG. 6 seals the introduction portion 6a of the antenna cable 6A. That is, the restraining wall 2c is erected to face the introduction portion flange 2b of the bottom cover 2A in which the cable hole 7A through which the antenna cable 6A is formed is formed, and the flexible rubber ring 8A is provided at the introduction portion 6a of the antenna cable 6A. Also, a ring retainer 9A having a knob 9a is fitted, and when the antenna assembly 1A is assembled, the rubber retainer 8A and the ring retainer 9A are compressed while the rubber retainer 9A is compressed by the ring retainer 9A. It is manually installed between and.

[0005]

However, since the work of assembling the rubber ring 8A and the ring retainer 9A with the knob is a delicate work that requires force, it is difficult to rationalize the assembling work. Since the incorporated antenna assembly 1A is in a floating state inside the accommodation chamber 3A, the antenna assembly 1A is fixed to the fixing piece 10 such as urethane foam.
Had to be fixed separately using.

An object of the present invention is to obtain a planar antenna in which the above-mentioned ring restraint and fixing piece can be omitted and the assembling process is easy, in view of the problem of the conventional waterproof structure of the planar antenna as described above.

[0007]

To achieve this object, the present invention provides a resin case including a bottom cover and a top cover for covering the surface of the bottom cover.
A planar antenna for accommodating an antenna assembly having a circuit board on which an antenna element and an accompanying circuit element are mounted, and introducing the antenna cable into a bottom cover from a cable hole formed in a peripheral wall of the bottom cover, A seal collar integral with the outer coating is fixed to the introduction end, the end of the antenna assembly on the side opposite to the antenna cable is brought into contact with the inner surface of the peripheral wall of the bottom cover, and the corresponding end of the antenna assembly is fixed. The present invention proposes a planar antenna that is applied directly or indirectly to the sealing collar to elastically deform the sealing collar. Further, in a preferred embodiment of the present invention described later, a structure in which a hard spacer retainer is interposed between the seal collar and the end of the antenna assembly adjacent to the seal collar is described.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The details of the embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows the entire planar antenna according to the present invention, including an antenna element 1a and a circuit board 1.
b, an antenna assembly 1 including a shield case 1c
Is housed in the housing chamber 3 of the resin-molded bottom cover 2 in the same manner as in the conventional case, but the housing chamber 3 is a resin plate 11 attached to the end surface of the peripheral wall 2d of the bottom cover 2 with a sealing material. Shielded from the outside.

As shown in FIGS. 2 and 3, a cable hole 7 is formed in the peripheral wall 2d of the bottom cover 2 which surrounds the accommodation chamber 3 so as to penetrate the introduction portion 6a of the antenna cable 6, and this cable hole is formed. A seal collar 12 made of the same material as the insulating coating of the antenna cable 6 is integrally formed on the peripheral surface of the introduction portion 6a of the antenna cable 6 inserted in the antenna cable 7. That is, the seal collar 12 is integrally formed on the peripheral surface of the antenna cable 6 by using a mold before the soldering to the circuit board 1b while the antenna cable 6 is passed through the cable hole 7. .

The seal collar 12 and the seal collar 12 are the same.
A hard spacer retainer 13 having a notch 13a is interposed between the end portion of the antenna assembly 1 and the end portion of the antenna assembly 1, and the seal flange 12 of the antenna cable 6 is provided on the peripheral wall 2d through the spacer retainer 13. It will be in close contact with the inner surface.

Since the planar antenna according to the illustrated embodiment has the above-described structure, the spacer cable 13 is provided between the corresponding end of the antenna assembly 1 and the seal collar 12 to form the antenna cable. By simply incorporating the antenna assembly 1 connected to 6 into the accommodation chamber 3, the introduction portion 6a of the antenna cable 6 can be sealed. That is, when the antenna assembly 1 is dropped into the accommodation chamber 3, as shown in FIG. 2, the right end portion of the antenna assembly 1 comes into close contact with the inner peripheral surface of the peripheral wall 2d, and the same antenna assembly is inserted through the spacer retainer 13. The seal flange 12 of the antenna cable 6 is in close contact with the corresponding inner peripheral surface of the peripheral wall 2d in a state of covering the opening of the cable hole 7 at the left end of the three-dimensional body 1. As a result, due to the close contact of the seal collar 12, the antenna cable 6 and the cable hole 7
Rainwater does not intrude into the storage chamber 3 from the outside through the gap between the antenna assembly 1 and the bottom cover 2. Without performing the above, it is possible to prevent the rattling of the antenna assembly 1 inside the bottom cover 2.

In the above embodiment, the spacer holder 13 is used. However, when the corresponding end surface of the antenna assembly 1 is smooth and can be evenly adhered to the surface of the seal collar 12, the spacer holder 13 is used. May be omitted.

[0013]

As is apparent from the above description, according to the present invention, the sealing process of the introduction portion of the antenna cable can be completed at the same time only by incorporating the antenna assembly inside the bottom cover, and the antenna assembly is specially constructed. It is possible to achieve a structure with excellent mass productivity that does not require fixing a solid body to the bottom cover.

[Brief description of the drawings]

FIG. 1 is an overall sectional view of a planar antenna according to the present invention.

FIG. 2 is a partially enlarged sectional view of the planar antenna.

FIG. 3 is an exploded perspective view of a main part of the planar antenna.

FIG. 4 is an overall sectional view of a conventional planar antenna.

FIG. 5 is an enlarged cross-sectional view of a main part of the planar antenna.

FIG. 6 is an exploded perspective view of a main part of the planar antenna.

[Explanation of symbols]

 1a Antenna element 1b Circuit board 1c Shield case 1 Antenna assembly 2d Peripheral wall 2 Bottom cover 3 Storage chamber 6a Introduction part 6 Antenna cable 12 Seal collar 13 Spacer restraint

Claims (2)

[Claims] 1. A resin case comprising a bottom cover and a top cover covering the surface of the bottom cover,
A planar antenna for accommodating an antenna assembly having a circuit board on which an antenna element and an accompanying circuit element are mounted, and introducing the antenna cable into a bottom cover from a cable hole formed in a peripheral wall of the bottom cover, A seal collar integral with the outer coating is fixed to the introduction end, the end of the antenna assembly on the side opposite to the antenna cable is brought into contact with the inner surface of the peripheral wall of the bottom cover, and the corresponding end of the antenna assembly is fixed. A planar antenna, which is directly or indirectly applied to the sealing collar to elastically deform the sealing collar. 2. The planar antenna according to claim 1, wherein a hard spacer retainer is interposed between the seal collar and an end portion of the antenna assembly which is adjacent to the seal collar.