JPH0364105A - Antenna device for electronic card - Google Patents

Abstract

PURPOSE:To simplify the manufacture and assembling by penetrating a thin ferrite bar to each notch provided in parallel in the lateral direction from their front and rear sides alternately in a way of tandem penetration so as to constitute the antenna. CONSTITUTION:A thin ferrite bar 11 is penetrated to notches 7..., 8... formed in parallel with antenna sections 5, 6 is penetrated alternately from the front and rear side in tandem way, then antenna coil patterns 9, 10 formed to the face of the antenna sections 5, 6 are wound on the surrounding of each ferrite bar 11. Thus, transmission and reception antennas 5A, 6A are formed side by side onto a printed circuit board 1 without winding a coil around the ferrite bar 11 on each occasion. Thus, the entire size of a coil type non-directional antenna with excellent sensitivity is made small with thin profile and the manufacture is simplified.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides an electronic card (transponding card) that can perform wireless transmission and reception with a fixed station by adding a wireless transmission and reception function to an IC (integrated circuit) card. The present invention relates to an antenna device suitable for use in a card.

[Conventional technology]

Electronic cards that can input/output and send/receive from any location without the use of a dedicated stationary reader/writer need to be made lightweight, thin, and small using ICs to make them convenient to carry. Transmitting and receiving antennas were also made by patterning antenna wires on printed circuit boards, but such flat antennas had problems such as directional characteristics and weak sensitivity. However, there was a problem that sufficient transmitting and receiving functions could not be achieved.

Therefore, it was considered to use a coil-type antenna that has good sensitivity and no directionality.

That is, the conventional coil antenna used in electronic cards has various electronic components for control, as shown in FIG.
, Tb, Tc... are mounted on the printed circuit board P, and the transmitting and receiving antennas A, A2, in which coils C1 and C2 are wound in advance around the ferrite bars F□ and F2, are installed in separate steps. It was designed to be connected and fixed, for example, by being integrally molded into the housing part.

[Problem to be solved by the invention]

However, although the coil-type transmitting/receiving antenna configured as described above can demonstrate excellent transmitting and receiving functions, the antenna as a whole is thick, so there is a problem that electronic cards cannot be made lighter, thinner, shorter, or smaller. Bar F1. The work of winding coils C1 and C2 around F is very troublesome and affects the manufacturing cost.
, there was a problem in that problems such as decreased sensitivity were more likely to occur due to the winding of the wires.

Therefore, the technical problem of the present invention is to create a thin and compact overall coil antenna with good sensitivity and no directionality, which is also extremely easy to manufacture and can be provided at low cost for electronic cards. An object of the present invention is to provide an antenna device.

[Means to solve the problem]

In order to solve the above technical problem, the measures taken in the present invention are as follows.

(1) An antenna part is installed in series on a printed circuit board with a single-sided pattern made of a flexible material, and the surface of the antenna part has multiple notches arranged in parallel at equal intervals, and a horizontal direction between each notch. The antenna is constructed by forming a meandering pattern for the antenna coil while being alternately reversed, and inserting a thin ferrite bar into each of the parallel notches from the lateral direction alternately from the front to the back.

(2) A transmitting antenna section and a receiving antenna section are arranged in series on the above printed circuit board, and the above-mentioned plurality of notches and antenna coil patterns are respectively formed on the surfaces of both antenna sections, and further, Seven antennas for transmitting, one for receiving, and one for receiving are constructed by inserting the above-mentioned ferrite bars into the notches of each antenna section.

[Effect]

The above means works as follows.

■The reason for (1) above is that when a thin ferrite bar is inserted into the skewer alternately from the front and back of each notch, the antenna coil pattern is wound around the inserted ferrite bar, so the coiled antenna In addition to providing an excellent antenna with good sensitivity and no directionality,
Since the entire antenna can be made thin, it is possible to make the card lighter, thinner, shorter, and smaller.Also, since the troublesome work of winding a coil around a ferrite bar is no longer necessary, manufacturing costs can be reduced and an inexpensive antenna device can be provided. possible.

■The element (2) above has good sensitivity and no directionality.

Moreover, since the transmitting antenna and the receiving antenna, which can be manufactured in a small size, can be connected to the same printed circuit board, it is possible to provide a small and high-performance electronic card.

As described above, the above-mentioned technical problem can be solved by the above-mentioned means, and the problems of the conventional technology can be solved.

〔Example〕

Hereinafter, preferred embodiments of the electronic card antenna device according to the present invention described above will be described in detail with reference to the accompanying drawings.

FIG. 1 is a plan view of a printed circuit board 1 which includes an antenna device according to the present invention and has a printed wiring pattern on one side. This printed circuit board is made of a relatively soft plastic material and is flexible. 1 includes a plurality of electronic components 2, 3.4 that constitute the control circuit of the electronic card.
... has been implemented.

Reference numerals 5 and 6 denote boards for a transmitting antenna section and a receiving antenna section, which are connected to the printed circuit board 1, and both antenna sections 5 and 6 are made of flexible plastic material like the printed circuit board 1. However, the printed circuit board 1 may be made of the same relatively hard plastic material as in the prior art, and only the antenna parts 5 and 6 may be made of a bendable plastic material to form a flexible board.

7... and 8... are a plurality of cuts arranged in parallel at equal intervals on the surfaces of both the antenna parts 5 and 6, and the number of both cuts 7 and 8 is arbitrary. Next, 9 and 10 meander in the same way on the surfaces of both antenna parts 5 and 6, alternately reversing in the left and right direction between each notch 7...18... The base ends 9b and 10b of both patterns 9 and 10 are respectively connected to the pattern on the printed circuit board 1 side.

Next, in FIG. 2, a thin ferrite bar 11 is inserted into each of the above-mentioned notches 7..., 8... from the lateral direction alternately from the front to the back, and is used for transmission and reception. Fig. 4 is a perspective view showing a state in which each of the antennas 5A and 6A (see Figs. 3 and 4) is being manufactured; ... and 8..., respectively, alternately antenna parts 5,
It appeared on the front side of 6.

The antenna coil patterns 9 and 10 are hidden behind the back side, and are arranged so that they can be wrapped around the antenna coil patterns 9 and 10.

In FIG. 3, the reference numerals indicate the width of the adhesive for fixing the substrates of the antenna parts 5 and 6 and the tip of each ferrite bar 1.

Since the electronic card antenna device according to the present invention has the above-described configuration, thin ferrite bars 11 are formed in the notches 7 . . . , 8 . When the antenna coil patterns 9 and 10 formed on the surface of each antenna part 5.6 are wound around each inserted ferrite bar 11, the antenna coil patterns 9 and 10 formed on the surface of each antenna part 5.6 are wound around each inserted ferrite bar 11. Even without winding a coil around the ferrite bar, equivalent transmitting and receiving antennas 5A and 6A can be made by connecting them to the printed circuit board 1.

〔effect〕

As described above, according to the electronic card antenna device according to the present invention, the antenna can be constructed by simply inserting the ferrite bar into the notch, which is different from the conventional coil type antenna constructed by winding a coil around a small ferrite bar. Compared to the above, manufacturing and assembly are greatly simplified and manufacturing costs can be reduced, and since the antenna assembled in the above manner is approximately the same thickness as the printed circuit board, the entire electronic card in which it is installed can be It can be made light, thin, short and small, and also has excellent functions as an antenna with no directionality and good sensitivity, making it suitable for use in various electronic cards for personal recognition. It is something.

[Brief explanation of drawings]

FIG. 1 is a plan view of a printed circuit board including an electronic card antenna device according to the present invention, FIG. 2 is a perspective view showing a state in which a ferrite bar is skewered through a notch, and FIG. 4 is a plan view of an antenna constructed according to the present invention, FIG. 4 is a sectional view taken along line A--A in FIG. 3, and FIG. 5 is a perspective view of a conventional device. 1 is a printed circuit board, 5 and 6 are antenna parts, 7 and 8 are notches, 9 and 10 are antenna coil patterns, 11 is a thin ferrite bar (Figure 1 0 Figure 2)

Claims (2)

[Claims] (1) An antenna part is installed in series on a printed circuit board with a single-sided pattern made of a flexible material, and the surface of this antenna part has multiple notches arranged in parallel at equal intervals, and the space between each notch extends in the left and right direction. The antenna is constructed by forming a meandering antenna coil pattern while alternately inverting, and inserting thin ferrite bars from the lateral direction alternately from the front and back into each of these parallel notches. An antenna device for electronic cards. (2) A transmitting antenna section and a receiving antenna section are arranged in series on the above printed circuit board, and the above-mentioned plurality of notches and antenna coil patterns are respectively formed on the surfaces of both antenna sections, and further, 2. An antenna device for an electronic card according to claim 1, wherein said ferrite bar is skewered and inserted into a notch in each antenna portion to constitute each antenna for transmission and reception.