JP2004153716A - Non-contact data transmitting-receiving body and its capacitance adjusting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a non-contact data transmitting-receiving body and its capacitance adjusting method for preventing an electromagnetic wave from being shielded although a conductive part for adjusting electrostatic capacitance is provided, and dealing with both rough adjustment and fine adjustment of the electrostatic capacitance. <P>SOLUTION: A non-contact data transmitting-receiving body 1 is provided with: a substrate 2 composed of a first insulation member; an IC chip 3 disposed on one surface of the substrate 2 for controlling storage, processing and communication of data; and an antenna body 4 composed of a conductive member and having its both terminals connected to the IC chip 3. The antenna body 4 has a plurality of circumferential parts 5 and a plurality of open ends 6 extending from the circumferential parts 5. The tips of the plurality of open ends 6 individually constitute a planar portion 8 arranged while facing the circumferential parts 5 via one second insulation member 7, and each portion 8 has at least a different area. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a non-contact data receiver / transmitter for reading / writing data and supplying power from the outside by electromagnetic waves or the like in a non-contact manner, and a capacitance adjustment method in the non-contact data receiver / transmitter.
INDUSTRIAL APPLICABILITY The non-contact data receiver / transmitter according to the present invention is suitably used for a card, a tag, and the like on which an IC is mounted.
[0002]
[Prior art]
In recent years, such as non-contact IC tags and information recording media for RF-ID (Radio Frequency IDentification), non-contact data reception has been made to receive information from outside using electromagnetic waves as a medium and to transmit information to the outside. A sender has been proposed.
[0003]
Conventionally, such a non-contact type data receiver / transmitter has a structure in which a loop-shaped antenna is disposed on a substrate, and an IC chip is mounted on the antenna. Further, the non-contact type data receiving / transmitting body has a predetermined resonance frequency in order to exchange data with an external read / write device via an electromagnetic wave having a predetermined frequency.
[0004]
In order to obtain this specific resonance frequency, the antenna constituting the conventional non-contact data transmitter / receiver is relatively widely arranged in a continuous pattern on the inside or outside of the antenna, which functions as a capacitor. A method is disclosed in which the conductive portion is partially cut off so as to have a desired capacitor capacity, thereby adjusting the electrostatic capacity of the antenna body as a whole, thereby obtaining a predetermined resonance frequency. (For example, see Patent Document 1).
[0005]
[Patent Document 1]
JP-A-11-353440 (paragraph 0019, FIGS. 1 to 3)
[0006]
However, in the method of Patent Document 1, while the adjustment of the capacitance is easy, when the communication function is operated by generating a voltage by the electromagnetic induction effect in the non-contact type data receiving / transmitting body, the conductive portion is connected to the antenna body. It has been found that the conductive portion shields electromagnetic waves because it is disposed in the circling portion, that is, in the inner region of the coil, and occupies a large area. As a result, it has been found that there is an inherent problem that communication capability is deteriorated.
[0007]
In order to solve such a problem, the specification of Japanese Patent Application No. 2001-040727 proposes a non-contact type data transmitter / receiver which has a conductive portion used for adjusting the capacitance and has a reduced degree of shielding electromagnetic waves. Have been.
[0008]
As shown in FIGS. 9 and 10, the non-contact type data receiver / transmitter 41 disclosed in Japanese Patent Application No. 2001-040727 has one insulating portion so as to be positioned on a vertical line of the circling portion 45 constituting the antenna body 44. A plurality of plate-like conductive portions 48 are arranged via 47, and a conductive wire (open end) 46 to which the plurality of plate-like conductive portions 48 are connected is connected to the circling portion 45. The lead-in portion connected to the line 46 is arranged at a position that does not exist on the perpendicular to the circling portion 45, and the lead-out portion can be divided.
The plate-shaped conductive portion 48 functions as a capacitance adjusting means by being arranged to face the circling portion 45 constituting the antenna body 44 via the insulating portion 47. Note that Japanese Patent Application No. 2001-040727 also discloses a configuration in which a plurality of plate-shaped conductive portions 48 are arranged via a base material forming a substrate instead of the insulating portions 47 (not shown).
[0009]
In any of the configurations, the plate-shaped conductive portion 48 is not located in the area inside the circling portion, but is arranged at a position where the plate-shaped conductive portion 48 is opposed to and overlaps the circling portion. It is described that a non-contact type data transmitter / receiver whose communication ability is not impaired can be obtained. In addition, the specification describes that a preferable method for forming the plate-shaped conductive portion 48 is a method of screen-printing and drying and fixing a conductive paste of a solvent volatile type, a thermosetting type or a photo-setting type. I have.
[0010]
[Problems to be solved by the invention]
However, the present inventors have studied the non-contact data transmitter / receiver described in the specification of Japanese Patent Application No. 2001-040727, and have found that the degree of design freedom is narrow in the following points.
[0011]
(1) As the plate-like conductive portion 48 functioning as a capacitance adjusting means, a plate-like conductive portion 48 having substantially the same area is exemplified. According to this configuration, the plate-like conductive portion 48 has a certain area. It is possible to adjust only the capacitance corresponding to an integral multiple of the capacitance of the capacitor to be created, and it is difficult to finely adjust the capacitance.
[0012]
(2) The capacitance to be adjusted is not limited to an integer multiple of the capacitance created by the fixed area of the plate-shaped conductive portion 48, and an error that cannot be adjusted within the range of the capacitance occurs.
[0013]
(3) In order to reduce the value of each capacitor in order to reduce the error of the above (2), it is necessary to provide a large number of plate-shaped conductive portions 48, and accordingly, the circulating portion, the plate-shaped conductive portion 48 and , The number of conductive lines (open ends) 46 connecting them increases, the circuit pattern becomes complicated, and the portion where a defect may occur increases.
[0014]
In view of the above circumstances, the present invention provides a structure that does not shield electromagnetic waves while providing a conductive portion for adjusting the capacitance, and enables a large adjustment of the capacitance and also facilitates fine adjustment. It is an object of the present invention to provide a non-contact type data transmitter / receiver and a capacitance adjustment method thereof.
[0015]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a substrate made of a first insulating member, an IC chip disposed on one surface of the substrate, for controlling data storage, processing and communication, and an IC chip Both ends are connected to each other, and an antenna body made of a conductive member is provided, wherein the antenna body has a plurality of circulating portions and a plurality of open ends extending from the circulating portions, and The distal end individually has a planar portion disposed to face the orbiting portion via one second insulating member, and the portion has at least one having a different area. A first contactless data receiver and transmitter.
[0016]
In the case of the first non-contact data transmitter / receiver having the above configuration, the antenna body has, in addition to the plurality of circling portions, a plurality of open ends extending from the circulating portions, and Of the open end portion is a planar portion disposed to face the circulating portion via one second insulating member. Further, each of these planar portions has at least one having a different area.
[0017]
Therefore, since each planar portion has a configuration in which the second insulating member is sandwiched between the facing portion and the surrounding portion, the conductive portion for adjusting the capacitance is provided. Electromagnetic waves can be prevented from being shielded. In addition, each planar portion functions as an independent capacitor, and the planar portions are configured to have at least ones having different areas from each other. At least those having different capacitor capacities can be included.
[0018]
In other words, a planar portion having a large area has a large capacitance, whereas a planar portion having a small area has a small capacitance. Needless to say, in the first non-contact data transmitter / receiver configured as described above, a plurality of planar portions having the same area may be provided.
[0019]
Therefore, the first non-contact data transmitter / receiver includes a plurality of planar portions having different areas as described above, and by appropriately selecting a combination thereof, the capacitance can be largely adjusted. And fine adjustment can be easily achieved.
[0020]
Further, according to the present invention, a substrate formed of a first insulating member, an IC chip arranged on one surface of the substrate, for controlling data storage, processing and communication, and both ends connected to the IC chip An antenna body made of a conductive member, the antenna body has a plurality of circulating portions and a plurality of open ends extending from the circling portions and disposed on the other surface of the substrate, The distal ends of the plurality of open ends individually form a planar portion disposed to face the circling portion via the substrate, and at least the portions each having a different area. A second non-contact data transmitter / receiver is provided.
[0021]
The second non-contact type data transmitter / receiver is different in that a circling portion and a planar portion are arranged to face each other via a substrate instead of the second insulating member. This eliminates the need to provide the second insulating member, so that cost can be reduced in both material and manufacturing. In addition, since a laminated structure is avoided in terms of circuit, there is an advantage that occurrence of a defect due to a laminated portion can be avoided. Furthermore, in the case of the configuration of the second non-contact type data transmitter / receiver, the open end and the circling portion are located on the opposite sides of the substrate, so that when performing the dividing process of the open end described later, Since there is no possibility of damaging the circling portion provided on the substrate surface opposite to the end portion, the dividing process can be stabilized. In the second non-contact data transmitter / receiver configured as described above, a plurality of planar portions having the same area may be provided in addition to the planar portions having different areas.
[0022]
In the first or second non-contact type data receiving / transmitting body, the above-mentioned planar portion functions as a capacitance adjusting means by cutting off a part of an open end which is a leading end of the planar portion. It is characterized by:
[0023]
According to this configuration, the plurality of planar portions are disposed to face the circulating portion via the second insulating member, and are located at positions overlapping the circulating portion. Since the open end extending from the planar part is located at a position that does not overlap with the peripheral part, even if the open end is partly cut, the peripheral part is not damaged and the individual planar parts are separated from the open end. You can select and disconnect.
[0024]
When the separation is performed, the separated planar portion loses the function as the above-described capacitor, and the non-separated planar portion maintains the capacitor function as it is. As a result, the antenna constituting the non-contact type data receiving and transmitting body can reduce the capacitance by the separated planar portion.
[0025]
A first method for adjusting the capacitance of a non-contact type data receiver / transmitter according to the present invention includes a substrate made of a first insulating member, and a substrate arranged on one surface of the substrate, for controlling data storage, processing and communication. And an antenna body having both ends connected to the IC chip and made of a conductive member, the antenna body having a plurality of circling portions and a plurality of open ends extending from the circulating portions. The distal ends of the plurality of open ends individually form planar portions that are disposed to face the circulating portion via one second insulating member, and the portions are respectively The first non-contact type data transmitter / receiver having at least one having a different area is used, and the capacitance is adjusted by cutting a part of the open end.
[0026]
A second method for adjusting the capacitance of a non-contact data receiver / transmitter according to the present invention includes a substrate made of a first insulating member and a substrate disposed on one surface of the substrate, for controlling data storage, processing and communication. And an antenna body having both ends connected to the IC chip and made of a conductive member, the antenna body extending from the plurality of circulating portions and the circulating portion, and the other surface of the substrate. It has a plurality of open ends arranged on the top, and the tips of the plurality of open ends individually form planar portions disposed to face the circling portion via the substrate. And, using a second non-contact type data receiver / transmitter, each of which has at least one having a different area, the capacitance is adjusted by cutting off a part of the open end. It is characterized by:
[0027]
As described above, in the case of the first or second non-contact type data transmitter / receiver according to the present invention, a plurality of planar portions face the circling portion via the second insulating member or the substrate. It is located at a position overlapping with the orbital portion, but each open end extending from each planar portion is at a position that does not overlap with the orbital portion. The selected planar part can be easily cut off from the open end without damaging the orbital part even when processing.
[0028]
In addition, this simple operation of separation is performed in the manufacturing process of the first or second non-contact data receiving / transmitting body, not only in the middle of the process, for example, immediately after the antenna body is manufactured, but also in the non-contact type data receiving / transmitting body. May be completed after all have been manufactured. Therefore, according to the capacitance adjusting method having the above-described configuration, the capacitance can be adjusted as necessary even after all the non-contact data transmitters and receivers have been manufactured, so that the communication characteristics can be stabilized. It contributes to the production of a non-contact type data receiver / transmitter with excellent performance.
[0029]
Furthermore, the fact that the capacitance can be adjusted even after all of the non-contact data transmitters and receivers have been manufactured can improve the manufacturing yield, thereby contributing to a reduction in product cost.
[0030]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a non-contact type data transmitter / receiver according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic plan view showing one example of a non-contact data transmitter / receiver according to the present invention. FIG. 2 is a cross-sectional view taken along line AA ′ of FIG. 1 and a cross-sectional view taken along line BB ′ of FIG.
[0031]
1 and 2 are a substrate 2 made of a first insulating member and an IC arranged on one surface of the substrate 2 for controlling data storage, processing and communication. A chip 3 and an antenna body 4 having both ends connected to the IC chip 3 and made of a conductive member are provided. The antenna body 4 includes a plurality of circling portions 5 and a plurality of open ends 6 extending from the circulating portions 5. The distal ends of the plurality of open ends 6 individually form planar portions 8 that are disposed to face the circling portion 5 with one second insulating member 7 interposed therebetween, and The parts 8 have at least parts having different areas.
[0032]
Although FIGS. 1 and 2 show an example in which all the portions 8 have different areas, the operation and effect of the present invention can be realized if there are at least two types of the portions 8 having different areas. Therefore, as long as this condition is satisfied, for example, a plurality of portions 8 having the same area may be provided.
[0033]
The antenna 4 constituting the non-contact type data transmitter / receiver 1 has a plurality of open ends 6 extending from the circulating section 5 in addition to the plurality of circulating sections 5. On the other hand, all of the distal ends of the plurality of open ends 6 form a planar portion 8 that is disposed to face the circling portion 5 with the same second insulating member 7 interposed therebetween. As a result, each planar portion 8 has a configuration in which the second insulating member 7 is sandwiched between the facing portion 5 and the surrounding portion 5, and thus individually functions as a capacitor.
[0034]
In addition, since the planar portion 8 is disposed above the circling portion 5 of the antenna 4, a wide space free of a conductive portion can be provided inside the antenna 4. As a result, it is possible to prevent the electromagnetic wave from being shielded while providing the planar portion 8 functioning as a conductive portion for adjusting the capacitance, so that the non-contact type data receiving device having excellent communication capability with the outside can be provided. A transmitter 1 is obtained.
[0035]
The individual planar portions 8 are independently disposed on one and the same second insulating member, and the portions 8 have different areas. Therefore, each planar portion functions as an independent capacitor, and these planar portions have different areas, so that the planar portions can individually have different capacitor capacities. . In other words, a planar portion having a large area has a large capacitance, whereas a planar portion having a small area has a small capacitance.
[0036]
Therefore, the first non-contact type data receiver / transmitter includes a plurality of planar portions having different areas as described above, and by appropriately selecting a combination thereof, the capacitance can be significantly increased. And fine adjustment can be easily achieved.
[0037]
As a method of forming the antenna body 4 made of a conductive member, the open end 6, and the planar portion 8 forming the tip of the open end 6, a known manufacturing method may be used. For example, a method of screen-printing and fixing a conductive paste of a solvent volatile type, a thermosetting type, or a photocuring type, drying and fixing, a method of attaching a coated or uncoated metal wire, an etching method, a method of attaching a metal foil, metal Examples thereof include a method of direct vapor deposition, a method of transferring a metal vapor deposited film, and a method of forming a conductive polymer film.
[0038]
In particular, the method of screen-printing and fixing the conductive paste by drying does not require a reduced-pressure atmosphere, and can easily form the antenna body 4 having an arbitrary line width at a desired position on the substrate 2 in a normal atmosphere. It is preferred.
[0039]
As the substrate 2, for example, a woven fabric, a nonwoven fabric, a mat, a paper made of an inorganic or organic fiber such as a glass fiber, an alumina fiber, a polyester fiber, and a polyamide fiber, or a combination thereof, or a resin varnish impregnated into these materials Molded composite substrate, polyamide resin substrate, polyester resin substrate, polyolefin resin substrate, polyimide resin substrate, ethylene / vinyl alcohol copolymer substrate, polyvinyl alcohol resin substrate, polychlorinated Vinyl resin base material, polyvinylidene chloride resin base material, polystyrene resin base material, polycarbonate resin base material. Plastic base such as acrylonitrile butadiene styrene copolymer base resin base and polyether sulfone base resin base, or matte processing, corona discharge processing, plasma processing, ultraviolet irradiation processing, electron beam irradiation processing, flame plasma processing and ozone A known surface treatment such as a treatment or a surface treatment such as various easy adhesion treatments can be used.
[0040]
The formation of the antenna body 4 (the orbital portion 5 and the open end portion 6) provided on one surface of the substrate 2 and the planar portion 8 forming the tip of the open end portion 6 can be performed by a known method. For example, solvent-volatile, thermosetting or light-curing conductive pastes are screen printed and dried and fixed, lamination of coated or uncoated metal, etching, metal foil bonding, direct metal deposition, metal deposition Examples include, but are not limited to, transfer of a film and formation of a conductive polymer layer.
[0041]
The place where the planar portion 8 forming the tip of the open end portion 6 is disposed so as to face the circling portion 5 with the second insulating member 7 interposed therebetween is such that when the IC chip is mounted on the substrate, heat is generated around the mounting portion. In addition, from the viewpoint that the substrate is likely to be deformed and that the adverse effect on the Ag paste or the like is avoided, the antenna body 4 is preferably located at a position away from the portion where the IC chip 3 is mounted.
[0042]
The second insulating member 7 is preferably formed at the same time as the third insulating member 9 because the working efficiency can be improved. By laminating the planar portion 8 forming the tip of the open end 46 via the second insulating member 7 on a perpendicular line of the circling portion 5 constituting the antenna body 4 (in the cross-sectional direction of the substrate), the electrostatic A means for adjusting the capacity is obtained. The second insulating member 7 is preferably formed at the same time as the third insulating member 9 on which one end of the circling portion 5 is placed, from the viewpoint of efficiency.
[0043]
The second insulating member 7 and the third insulating member 9 can be formed by a known method such as printing of an insulating paste, pasting of an insulating film via an adhesive, and pasting of an insulating tape. Screen printing using an insulating paste is most preferable. In forming an insulating member by screen printing, a composition comprising insulating particles and a binder is used as a coating agent, and examples of the insulating particles include silica, alumina, and talc.
[0044]
The dielectric constant of the second insulating member 7 and the third insulating member 9 can be finely adjusted by appropriately selecting the material of the insulating particles and the mixing ratio thereof. However, in the case where the insulating property is ensured even without the insulating particles, the second insulating member 7 and the third insulating member 9 may be formed by using a composition composed of only the binder.
[0045]
Further, in forming the second insulating member 7 and the third insulating member 9, an insulating ink may be used instead of the above composition. As the insulating ink, any known material such as a penetration drying type, a solvent evaporation type, a thermosetting type, and a photo-setting type can be used. Further, it is more preferable to include a photocurable resin in the binder because the curing time can be shortened and the working efficiency can be improved. Solvent-free (containing no solvent) is preferable because it can prevent the generation of microcracks that occur when the solvent evaporates.
[0046]
The thickness of the second insulating member 7 and the third insulating member 9 is preferably in a range of 15 μm to 60 μm. If the thickness is less than 15 μm, the insulating layer may be damaged due to external force such as bending or rubbing during transportation, and the insulating function may be impaired. Also, when micro cracks occur, insulation failure may occur as compared with the case where the thickness is large. Not good because it's easy. On the other hand, when the thickness is more than 60 μm, in addition to requiring much time for drying after printing the insulating paste and inviting a decrease in production efficiency, dripping is likely to occur in the paste immediately after printing until the end of drying, It is not good because there is a problem that a predetermined uniform shape cannot be obtained.
[0047]
The planar portion 8 constituting the capacitance adjusting means is provided as a tip of the open end 6 constituting the antenna body 4. Therefore, the planar portion 8 is directly connected to the antenna body 4 through the open end 6 and is in a conductive state. In particular, in the open end 6, the connection region following the planar portion 8 is set to a position that does not exist on the perpendicular of the circuit portion 5 (a position that does not overlap with a position corresponding to the circuit portion 5 in the cross-sectional direction of the substrate 1). With this arrangement, the open end portion 6 including the connection region can be easily separated by a method described later.
[0048]
FIG. 1 shows an example in which the open end 6 is disposed inside the circling portion 5 constituting the antenna body 4, but is not limited to the inside, and is arranged outside the circulating portion 5. Needless to say, it does not matter.
[0049]
In particular, the planar portion 8 in FIG. 1 has a shape in which the direction in which the circling portion 5 of the antenna body 4 extends is one side, and the direction traversing the circulating portion 5 is another side. It is arranged so as to cover the part 5. The plurality of planar portions 8a, 8b, 8c, 8d have different areas.
[0050]
As is clear from FIG. 2A, in this configuration, the plurality of planar portions 8a, 8b, 8c, and 8d have different areas facing the orbital portion 5, respectively. Capacitor capacitances formed by the planar portions 8a, 8b, 8c, 8d can be different values.
[0051]
Therefore, the open end 6 described later is subjected to a cutting process, and only an appropriate planar portion is left in a connected state, so that the remaining planar portion has a capacitance having a desired value by a combination thereof. Can be used as an adjustment means. Therefore, the non-contact type data transmitter / receiver having the structure shown in FIGS. 1 and 2 has the conventional example shown in FIGS. 6 and 7, that is, in the case where it has a plurality of planar parts having substantially the same area. It is preferable to appropriately control a desired capacitance, which is difficult to control.
[0052]
FIGS. 3 and 4 are views showing a second non-contact type data receiver / transmitter according to the present invention, wherein a substrate 12 made of a first insulating member and a data An IC chip 13 for controlling the storage, processing and communication of the IC chip 13 and an antenna body 14 having both ends connected to the IC chip 13 and made of a conductive member. A plurality of open ends 16 extending from the portion 15 and disposed on the other surface of the substrate 12, and the tips of the plurality of open ends 16 are disposed to face the circling portion 15 via the substrate 12. The planar portions 18 are individually formed, and the portions 18 have different areas.
[0053]
3 and 4, the second insulating member 17 is provided between the substrate 12 and the planar portion 18, but the second insulating member 17 is not an essential requirement, A configuration in which the second insulating member 17 is removed may be employed.
[0054]
In FIG. 3, the plurality of open ends 16 and the individual planar portions 18 forming the tips are arranged on the surface opposite to the surface of the substrate 12 provided with the circling portion 15 of the antenna body 14. . The orbiting portion 15 and the open end portion 16 are electrically connected by providing a conductive portion on the substrate 2 at the point indicated by the symbol α. The conductive portion may have a structure in which the substrate 2 is plated with through holes in advance, may be caulked with a conductive material, or may be fixed with a conductive stable. Further, a fine hole may be formed in the substrate 2 so that the paste is embedded in the hole at the time of printing the conductive paste so that conduction can be achieved.
[0055]
3, the second insulating member 7 in FIG. 1 is not always necessary. Therefore, the second insulating member 7 and the planar portion 8 disposed thereon may be used. In addition, it is possible to avoid the problem caused by laminating the open ends 6 serving as the conductive paths to the planar portions 8, and to reduce the manufacturing cost because the multiple steps required for forming these are unnecessary. It can also be suppressed.
[0056]
However, as shown in FIGS. 3 and 4, when it is necessary to increase the capacitance of each of the planar portions 18, a second insulating layer is provided between the substrate 12 and the planar portion 18. It goes without saying that the member 17 may be provided.
[0057]
As described above, in the case of the non-contact data transmitter / receiver having the configuration shown in FIGS. 1 and 2, the plurality of planar portions 8 face the orbiting portion 5 via the second insulating member 7. Therefore, each planar portion 8 individually functions as a capacitor. Then, by selecting and dividing the open end 6 connecting the plurality of planar portions 8 and the orbiting portion 5, the selected capacitor portion is deleted, and the desired capacitor portion remains. The portion 8 serves also as a capacitance adjusting means.
[0058]
This point is apparent from the following equation. By dividing at least a part of the open end portion 6, the capacitance is reduced, and as a result, the resonance frequency of the circuit is increased. Becomes possible. In the following equation, f represents the resonance frequency, L represents the inductance of the antenna, and C represents the capacitance.
[0059]
(Equation 1)
f = 1 / [2π (LC) ^1/2 ]
[0060]
By providing in advance how much the capacitance of the area formed by the planar portion 8 functions as a capacitor, the capacitance of the entire antenna body 4 can be precisely fine-tuned. preferable.
[0061]
For example, as shown in FIG. 1, the planar portion 8 has a shape in which the direction in which the circling portion 5 of the antenna body 4 extends is set to one side, and the direction traversing the circulating portion 5 is set to another side. It is arranged so as to cover a plurality of orbiting parts 5. As is clear from FIG. 2A, with this configuration, the area of the planar portion 8 facing the orbital portion 5 is extremely small, so that an extremely small amount of capacitance can be accurately controlled. Therefore, the non-contact data transmitter / receiver having the configuration shown in FIGS. 1 and 2 is preferable for accurately controlling a small amount of capacitance.
[0062]
Hereinafter, a method for adjusting the capacitance of the non-contact type data receiver / transmitter according to the present invention will be described based on the configurations shown in FIGS. Note that the capacitance adjustment method of the second non-contact data receiver / transmitter corresponding to the configuration of FIGS. 3 and 4 is also similar to the capacitance adjustment method of the first non-contact data receiver / transmitter described in detail below. It works.
[0063]
The first method for adjusting the capacitance of a non-contact type data receiver / transmitter according to the present invention includes a substrate 2 made of a first insulating member and a substrate 2 disposed on one surface of the substrate 2 for storing, processing, and communicating data. It comprises an IC chip 3 for controlling, and an antenna 4 connected at both ends to the IC chip 3 and made of a conductive member. The antenna 4 is provided with a plurality of circling portions 5 and a plurality of open portions extending from the circulating portion 5. Each of the plurality of open ends 6 has an end 6, and each of the ends of the plurality of open ends 6 individually forms a planar portion 8 that is disposed to face the circling portion 5 via one second insulating member 7. In addition, the capacitance is adjusted by using a non-contact type data transmitter / receiver having a different area for each of the portions 8 and by cutting a part of the open end 6. .
[0064]
In other words, in the capacitance adjusting method having the above-described configuration, the planar portion 8 which is the tip of the plurality of open ends 6 is provided at the position overlapping with the circling portion 5 of the antenna body 4 via one second insulating member 7. In the non-contact type data receiving / transmitting body individually provided, only a planar portion 8 having a predetermined capacitor capacity is left by cutting a part of the open end portion 6, and the remaining planar shape is formed. The desired capacitance is adjusted by combining the portions 8 with each other, and as a result, the resonance frequency can be set (see the above equation).
[0065]
The method of the present invention is different from a conventional method of arranging a conductive portion so as to occupy a large area inside or outside of an antenna body and adjusting the capacitance (for example, Japanese Patent Application Laid-Open No. H11-353440). In contrast, the capacitance can be adjusted without affecting the communication ability.
[0066]
That is, in the present invention, as described above, the planar portion 8 functioning as the capacitance adjusting means is disposed so as to correspond to the perpendicular line of the circling portion 5 constituting the antenna body 4, and the electromagnetic wave is transmitted. Since there is no shielding, communication ability is not impaired. When adjusting the capacitance, the open end 6 is divided at a portion that does not intersect with the perpendicular of the circling portion 5, so that there is no problem of damaging the circulating portion 5 of the antenna 4.
[0067]
As a method of cutting the open end portion 6, for example, a known method such as cutting with a cutting tool, punching, abrasion with a file, and burning with a laser can be used. An advantage is that even if a part of the substrate is punched out, the peripheral portion 5 of the antenna 4 is not directly affected.
[0068]
If the open end 6 is to be disconnected while the open end 6 is positioned on the perpendicular to the circuit 5, the second insulating member 7 is broken, and the circuit 5 below it is also damaged. As a result, the problem that the communication ability is completely lost easily occurs. Since a delicate operation is required to avoid this disconnection, it is not suitable for mass production, and the industrial feasibility is low.
[0069]
In the example shown in FIG. 1, the position where the planar portion 8 is provided is on the second insulating member 7 provided to be laminated on the circling portion 5, but is formed thereon via another insulating member. May be. That is, a laminated structure in which conductive portions and insulating portions are alternately provided many times, such as a second insulating member 7 / a planar portion / another insulating member / a planar portion, on the circling portion 5; By doing so, a large capacitance may be controllable.
[0070]
It is needless to say that the idea of such a laminated structure is not limited to FIG. 1 and can be applied to the configuration shown in FIG. 3, FIG. 5, or FIG.
[0071]
Although not shown, a mode in which the planar portion 8 shown in FIG. 1 and the planar portion 18 shown in FIG. 3 are provided on both surfaces of the substrate so as to sandwich the orbiting portion 5 of the antenna body 4, respectively. You may adopt it.
[0072]
【The invention's effect】
As described above, the non-contact type data transmitter / receiver according to the present invention has an antenna body for transmitting and receiving to and from the outside via electromagnetic waves, having a plurality of circulating portions and a plurality of open ends extending from the circulating portions. In addition, since a configuration is provided in which the distal ends of the plurality of open ends individually form planar portions that are disposed to face the circulating portion via one second insulating member, the planar The portions function as conductive portions for adjusting different capacitances, and the planar portion is provided at a position overlapping with the circling portion, so that electromagnetic waves are not shielded.
[0073]
In addition, since each planar portion 8 is independently disposed on one and the same second insulating member, and each of the portions 8 has at least one having a different area, The capacitance of each planar portion can be set to be significantly different. By appropriately combining the different capacitor capacities, the non-contact type data reception that can support a large adjustment to a fine adjustment without limiting the adjustable capacitance as in the related art to an integer multiple of a fixed value. It is possible to provide a transmitter.
[0074]
Furthermore, according to the present invention, in addition to the planar portions having different areas, a plurality of planar portions having the same area are provided at the same time, thereby adjusting the capacitor capacitance which is an integral multiple of the predetermined capacitor capacitance. Configurations can also be provided.
[0075]
The method for adjusting the capacitance of the non-contact type data receiver / transmitter according to the present invention is simple in that at least a part of the open end provided at a position that does not overlap with the orbital portion of the antenna body and having a planar portion is divided. It can be performed by any method. Since the open end to be divided does not overlap with the orbital portion of the antenna body, the orbital portion of the antenna body is not damaged by this division.
[0076]
Therefore, the capacitance adjusting method of the present invention can perform a stable dividing process by a simple operation, and thereby, the capacitance can be adjusted accurately and largely or finely. Variations in capacitance can be suppressed, and this contributes to a large-scale and stable production of a non-contact data transmitter / receiver having a desired capacitance.
[Brief description of the drawings]
FIG. 1 is a schematic plan view showing an example of a non-contact data transmitter / receiver according to an embodiment of the present invention.
2A is a cross-sectional view taken along line AA ′ of FIG. 1 and FIG. 2B is a cross-sectional view taken along line BB ′.
FIG. 3 is a schematic plan view showing another example of the non-contact type data transmitter / receiver according to the embodiment of the present invention.
4A is a sectional view taken along the line CC ′ of FIG. 3 and FIG. 4B is a sectional view taken along the line DD ′.
FIG. 5 is a schematic plan view showing an example of a non-contact data receiver / transmitter according to a conventional example.
6A is a cross-sectional view taken along line II ′ of FIG. 5 and FIG. 6B is a cross-sectional view taken along line JJ ′.
[Explanation of symbols]
α conduction part,
1, 11 contactless data receiver / transmitter,
2,12 substrates,
3, 13 IC chip,
4, 14 antenna body,
5, 15 laps,
6, 16 open end,
7 Second insulating member,
8, 18 planar parts,
9, 19 Third insulating member.
41 contactless data receiver / transmitter,
42 base material,
43 IC chips,
44 antenna body,
45 laps,
46 conductive wires,
47, 49 insulating part,
48 Plate-shaped conductive part.

Claims (5)

A substrate made of a first insulating member, an IC chip arranged on one surface of the substrate, for controlling data storage, processing and communication, and both ends connected to the IC chip and made of a conductive member With an antenna body,
The antenna body has a plurality of circling portions and a plurality of open ends extending from the circulating portions,
The distal ends of the plurality of open ends individually form planar portions disposed to face the orbiting portion via one second insulating member, and the portions have different areas. A non-contact type data transmitter / receiver comprising at least one having: A substrate made of a first insulating member, an IC chip arranged on one surface of the substrate, for controlling data storage, processing and communication, and both ends connected to the IC chip and made of a conductive member With an antenna body,
The antenna body has a plurality of circling portions and a plurality of open ends extending from the circling portions and arranged on the other surface of the substrate,
The distal ends of the plurality of open ends individually form planar portions disposed to face the circling portion via the substrate, and the portions have at least ones having different areas. A non-contact data transmitter / receiver, comprising: 3. The non-contact data receiver according to claim 1, wherein the portion functions as a capacitance adjusting unit by cutting a part of the open end. 4. A substrate made of a first insulating member, an IC chip arranged on one surface of the substrate, for controlling data storage, processing and communication, and both ends connected to the IC chip and made of a conductive member With an antenna body,
The antenna body has a plurality of circling portions and a plurality of open ends extending from the circulating portions,
The distal ends of the plurality of open ends individually form planar portions disposed to face the orbiting portion via one second insulating member, and the portions have different areas. A non-contact type data receiving / transmitting unit having at least a device having: a non-contact type data receiving / transmitting unit, wherein the capacitance is adjusted by cutting a part of the open end. Capacitance adjustment method. A substrate made of a first insulating member, an IC chip arranged on one surface of the substrate, for controlling data storage, processing and communication, and both ends connected to the IC chip and made of a conductive member With an antenna body,
The antenna body has a plurality of circling portions and a plurality of open ends extending from the circling portions and arranged on the other surface of the substrate,
The distal ends of the plurality of open ends individually form a planar portion disposed to face the circling portion via the substrate, and at least the portions each having a different area. Using the provided non-contact data transmitter / receiver,
A capacitance adjustment method for a non-contact type data receiver / transmitter, wherein the capacitance is adjusted by cutting a part of the open end.

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