JP2001102850A - Antenna for non-contact data transmitter/receiver and capacitance control method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily provide a non-contact data transmitter/receiver in which the capacitance of an antenna is increased and adjusted without newly designing the antenna. SOLUTION: This antenna is provided with a capacitance control means 3 composed of a plurality of antenna side planar conductors 7 individually and integrally connected to the antenna 6 and arranged with intervals in the loop length direction of the antenna 6 and a plurality of opposite side planar conductors 8 of mutually non-connected independent patterns respectively arranged corresponding to the antenna side planar conductors 7 through an insulating material A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna used for a non-contact type data receiver / transmitter such as a non-contact type IC tag and a method for manufacturing the same.

[0002]

In recent years, non-contact IC tags and RF-IDs (Radio Frequency) have been developed.
receiving information using an electromagnetic wave as a medium, such as an information recording medium for ncy identification (entry) use,
Also, a non-contact type data receiver / transmitter capable of transmitting data has been proposed. This non-contact type data receiving / transmitting body has a relatively small size and a thin shape, and receives and transmits data via the antenna and data transmission / reception to an antenna body having an antenna made of a conductor on a base material. The antenna on the base material of the antenna body is formed by obtaining a conductor of an antenna pattern by printing, etching, or the like. It had been.

[0003] In forming an antenna of the above-mentioned non-contact type data receiver / transmitter, the DC resistance R, the inductance L, the capacitance C, and the sharpness Q of resonance are important, and the antenna is formed while controlling these. It is necessary to do. However, as a method of adjusting the capacitance of the formed antenna regardless of printing or etching by post-processing, only processing in the direction of lowering the capacitance, such as shaving a conductor or cutting with a laser, is performed. . This point deals with a case where the formed antenna is thicker than the designed antenna (the interval between the antenna loops becomes narrower). Therefore, the post-processing by this method cannot increase the capacitance. Therefore, when an antenna with a high capacitance is used, a new antenna design is performed.However, it is necessary to increase the sharpness of resonance in order to increase the value of the capacitance. Adjustment in the direction of increasing the size has not been easy. Accordingly, the present invention has been made in view of the above circumstances, and an object of the present invention is to increase the capacitance of an antenna without performing a new design of the antenna, and to easily obtain a contactless data receiver and transmitter having an adjusted capacitance value. It is the purpose.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and is directed to an antenna body having an antenna made of a conductor on a base material, which is capable of transmitting and receiving data via the antenna. In an antenna body serving as a non-contact data receiver / transmitter by providing an IC chip for performing a data holding operation so that data can be written, the antenna bodies are integrally connected to the antennas, and are spaced apart in the loop length direction of the antenna. A plurality of planar conductors on the antenna side, and a plurality of planar conductors on the opposite side, each of which is an independent pattern that is arranged corresponding to the planar conductor on the antenna side via an insulating material and is not connected to each other. It is an object of the present invention to provide a non-contact data transmitter / receiver characterized by comprising a capacitance adjusting means comprising a conductor, and to solve the above problem. In the present invention, the insulating material is the base material, and the planar conductor on the opposite side of the capacitance adjusting means is located on a surface opposite to the antenna surface side of the base material. In addition, the insulating material is an insulating sheet provided with a planar conductor on the opposite side, the insulating sheet is superposed on the antenna, and the planar conductor on the antenna side and the surface on the opposite side are interposed via the insulating sheet. And the insulating material is an insulating resin layer formed on the planar conductor on the antenna side, and the insulating material on the opposite side is formed on the insulating resin layer. The planar conductor may be formed by printing. Further, another invention is characterized in that a pair of the planar conductor on the antenna side and the planar conductor on the opposite side in the capacitance adjusting means of the non-contact type data receiving and transmitting body are selectively made conductive. The object of the present invention is to solve the above-mentioned problem by providing a capacitance adjusting method for a non-contact type data receiving / transmitting antenna.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail based on the embodiments shown in FIGS. In the figure, reference numeral 1 denotes an antenna for a non-contact type data receiving / transmitting body. The antenna 1 comprises a main body 2 and a capacitance adjusting means 3. The main body 2 is provided with an antenna 6 made of a conductor 5 by applying a conductive ink by printing on a base material 4 made of an insulating material such as paper.
Further, by connecting an IC chip for performing a data transmission / reception operation via the antenna 6 and a data holding / rewritable operation, a non-contact data receiver / transmitter can be formed. On the other hand, the capacitance adjusting means 3 comprises a plurality of planar conductors 7 on the antenna side and a plurality of planar conductors 8 on the opposite side facing each other via the insulating substance A. Each of them is a rectangular conductor which is integrally connected to the antenna 6 and is arranged at an interval in the loop length direction of the antenna. Square conductors, which are arranged corresponding to the planar conductors 7 on the side and are independent patterns that are not connected to each other, and the planar conductors 7 and 8
The planar conductor 7 and the planar conductor 8 are opposed to each other via the insulating material A, and as described later, the two are operated to form a capacitor, thereby increasing the capacitance. Is to do so. As shown in FIG. 1, the specific structure of the antenna 1 is such that the planar conductor 8 of the capacitance adjusting means 3 is
(See FIG. 1 (b)), the plurality of planar conductors 7 and the plurality of planar conductors 8 face each other in this state using the base material 4 as an insulating material A. Is what you are doing.

FIG. 1 shows a first example in which a planar conductor 8 is disposed on the surface of the base 4 opposite to the antenna surface, but the present invention is not limited to this. The capacitance adjusting means 3 can have another configuration. FIG. 2 shows a second example. In this second example, the insulating material A is an insulating sheet 9 provided with a planar conductor 8. The planar conductor 7 on the antenna side and the planar conductor 8 on the opposite side are arranged correspondingly via the insulating sheet 9. FIG. 3 shows a third example in which the insulating substance A is an insulating resin layer 10 made of a resist ink or the like formed on the planar conductor 7 on the antenna side. The capacitance adjusting means 3 can be formed by printing and forming the sheet conductor 8 on the opposite side.

[0007] In the antenna body 1 having the above structure, in order to adjust the value of the capacitance to a higher value,
A set of the planar conductor 7 on the antenna side and the planar conductor 8 on the opposite side may be selectively caulked, and the planar conductor 7 on the antenna side and the planar shape on the opposite side in this caulked set The conductor 8 becomes conductive, and the value of the capacitance changes by changing the number of crimped sets. In addition,
As a method of conducting between the planar conductor 7 on the antenna side and the planar conductor 8 on the opposite side, through-holes may be provided other than by caulking to achieve conduction. Further, the insulating substance A is connected to the insulating resin layer. In such a case, a capacitor may be formed by providing only a conductive material such as a conductive ink instead of the insulating resin layer only in a set that allows conduction.

[0008] The number of sets (sets of a sheet conductor on the opposite antenna side and a sheet conductor on the opposite side) caulked with respect to the antenna body 1 having the above-mentioned capacitance adjusting means 3 is changed ( a), (b) and (c) are prepared, and their DC resistance (R (Ω)) and inductance (L (μ
H)), capacitance (C (pF)), and resonance sharpness (Q value) were determined.

[0009]

Table 1 Caulking number RLC Q value (a) 0 69 5.0 5.66 (b) 169 5.0 6.66 (c) 269 5.0 6.9 6

As shown in Table 1, increasing the number of pairs of the planar conductor on the antenna side and the planar conductor on the opposite side that is caulked to the capacitance adjusting member may increase the capacitance value. It could be confirmed.

[0011]

According to the invention described above, the capacitance adjusting means has a simple structure in which the planar conductor on the antenna side and the planar conductor on the opposite side are opposed to each other via an insulating material. There is no complication. Also,
An antenna having an increased capacitance value can be obtained without newly designing an antenna. Then, the antenna body having various capacitance values can be efficiently manufactured with a simple configuration of selectively conducting the set of the planar conductor on the antenna side and the planar conductor on the opposite side, and has excellent practicality. It is effective.

[Brief description of the drawings]

FIG. 1 shows a first example of a non-contact type data receiver / transmitter according to the present invention, wherein (a) is an explanatory view showing an antenna surface side,
(B) is an explanatory view showing the opposite surface side.

FIG. 2 shows the second example in an exploded state, and (a)
Is an explanatory view showing the antenna surface side of the main body, and (b) is an explanatory view showing the insulating sheet.

FIG. 3 shows the third example in a disassembled state.
Is an explanatory diagram showing the antenna surface side of the main body, (b) is an explanatory diagram showing an insulating material superimposed on the planar conductor on the antenna side, and (c) is an explanatory diagram showing the opposing planar conductor overlaid on the insulating material. .

[Description of Signs] 1 ... Non-contact type data transmitter / receiver 2 ... Main body 3 ... Capacitance adjusting means 4 ... Base material 6 ... Antenna 7 ... Planar conductor on antenna side 8 ... Planar conductor on opposite side A ... Insulating material

Claims (5)

[Claims] 1. An IC having an antenna made of a conductor on a base material, wherein the IC performs an operation of receiving and transmitting data via the antenna and an operation of storing data in a writable manner.
In an antenna body which becomes a non-contact type data receiving and transmitting body by providing a chip, a plurality of antenna-side surfaces respectively connected integrally to the antenna and arranged at intervals in a loop length direction of the antenna And a capacitance adjusting means including a plurality of planar conductors on the opposite side, each of which is disposed in correspondence with the planar conductor on the antenna side via an insulating material and is an independent pattern not connected to each other. Contactless data receiver and transmitter. 2. The apparatus according to claim 1, wherein the insulating material is the base material, and the planar conductor on the opposite side of the capacitance adjusting means is located on a surface of the base material opposite to the antenna surface side. Non-contact type data receiving and transmitting antenna. 3. The insulating material is an insulating sheet provided with a sheet conductor on the opposite side, the insulating sheet is superposed on the antenna, and the sheet conductor on the antenna side and the surface on the opposite side via the insulating sheet. The antenna for a non-contact type data receiver / transmitter according to claim 1, wherein the conductors are arranged correspondingly. 4. The insulating material is an insulating resin layer formed on the planar conductor on the antenna side, and the planar conductor on the opposite side is printed and formed on the insulating resin layer. 2. The antenna for a non-contact type data receiver / transmitter according to claim 1. 5. A set in which a planar conductor on the antenna side and a planar conductor on the opposite side in the capacitance adjusting means of the non-contact type data receiving / transmitting body according to any one of claims 1 to 4 are selected. A method for adjusting the capacitance of an antenna for a non-contact type data receiver / transmitter, characterized by electrically conducting.