JPH1125244A - Non-contact data carrier package - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a non-contact data carrier package having a long communication distance. SOLUTION: In this non-contact data carrier package, a conductive sheet 5 is arranged in the surrounding of an antenna coil 2 so as to be overlapped on one part of the radiating face of the antenna coil 2. Thus, each kind of parameter such as the area, shape, and thickness of the conductive sheet 5, and a position relation with the antenna coil 2 is optimally selected so that the radiation efficiency of the antenna coil 2 can be increased, and a communication distance can be significantly extended.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a non-contact type data carrier package.

[0002]

2. Description of the Related Art A non-contact data carrier system includes a transponder called a non-contact data carrier attached to an article or the like and an interrogator connected to a host. It is characterized in that communication is performed in a non-contact manner through transmission media such as magnetism, induction electromagnetic field, microwave (radio wave) and the like.

[0003] The information transmission system of the non-contact data carrier system includes an electromagnetic coupling system, an electromagnetic induction system, a microwave system, an optical communication system and the like. Among these systems, the electromagnetic coupling system and the microwave system can use the energy of the transmission signal from the interrogator as the driving power of the transponder. For this reason, there is a further advantage that there is no fear that the response performance is degraded or the use limit is reduced due to the approaching life of the battery as in the case where the battery is used as a drive source.

FIG. 5 shows the overall structure of a contactless data carrier system. As shown in FIG. 1, the contactless data carrier system includes an interrogator 10 and a transponder (contactless data carrier) 20.

[0005] The interrogator 10 includes a main controller 11 for controlling the entire interrogator 10, an interface 12 for controlling the input and output of data with the host device, and tag information and the like received from the contactless data carrier 20. A storage unit 13 such as a readable / writable RAM for storing, and a signal conversion unit 14 for converting transmission information from a digital signal to an analog signal and converting a reception signal from the non-contact data carrier 20 from an analog signal to a digital signal. And a transmission signal, for example, an ASK (Amplitude Shift Keying) method, FSK (Freq
A modulation unit 15 that modulates a signal for transmission by a uency shift keying method or the like, a demodulation unit 16 that demodulates a received signal, a transmission antenna 17, and a reception antenna 18 are provided.

The transponder (contactless data carrier) 20
A main control unit 21 for controlling the entire non-contact data carrier 20, a storage unit 22 such as an EEPROM for storing tag information which does not require a power supply backup, converting transmission information from a digital signal to an analog signal, and an interrogator 10; A signal converter 23 for converting a received signal from an analog signal to a digital signal, a modulator 24 for modulating a transmission signal into a signal for transmission by an ASK method, an FSK method or the like, and a demodulator 25 for demodulating a received signal. , A transmission antenna 26, and a reception antenna 27.

The basic communication procedure of this contactless data carrier system is as follows.

[0008] The interrogator 10 first transmits an interrogation signal for reading tag information from the non-contact data carrier 20. When the contactless data carrier 20 enters the receivable range of the inquiry signal, it receives the inquiry signal and transmits the tag information stored in the storage unit 22 as a response signal. The interrogator 10 receives and decodes this response signal and sends it to the host device as tag identification information.

The transponder (contactless data carrier) is composed of an antenna part and a circuit part for transmitting and receiving signals to and from the interrogator, and is made of resin or the like in consideration of environmental resistance. Internal components such as antenna components and circuit components are hermetically sealed.

[0010]

In such a non-contact data carrier system, one of the requirements is to extend the communication distance between the transponder (non-contact data carrier) and the interrogator. As a measure to extend the communication distance, for example, it is conceivable to increase the diameter of the antenna coil.
However, increasing the diameter of the antenna coil leads to an increase in the size of the non-contact data carrier package,
In particular, it is not a sufficient measure for a request to dramatically increase the communication distance.

The present invention has been made in view of the above circumstances, and has as its object to provide a non-contact data carrier package capable of dramatically extending a communication distance without increasing the diameter of a coil antenna. .

[0012]

In order to achieve the above object, a non-contact data carrier package according to the present invention is a non-contact data carrier package having an antenna coil, wherein a radiation surface of the antenna coil is provided around the antenna coil. And a conductive member is arranged so as to partially overlap.

Further, according to the present invention, in the non-contact data carrier package, a first cutout for exposing a part of the radiation surface of the antenna coil is formed in the conductive member, and the conductive cutout is formed from the first cutout. A second notch extending over the end of the member.

In the non-contact data carrier package configured as described above, the radiation efficiency of the antenna coil is selected by optimally selecting various parameters such as the area, shape and thickness of the conductive member and the positional relationship with the antenna coil. And the communication distance can be greatly increased.

[0015] Further, by providing the conductive member with a second notch extending from the first notch exposing a part of the radiation surface of the antenna coil to the end of the conductive member, the antenna coil is further improved. Radiation efficiency can be increased, and the communication distance can be extended.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing the structure of the non-contact data carrier package of the present embodiment, and FIG. 2 is a sectional view thereof.

In these figures, reference numeral 1 denotes an internal part of a non-contact data carrier. This internal part 1 includes an antenna coil 2 made of, for example, a copper wire coated with a resin, and a transponder (see FIG. 5). It is composed of a substrate 3 on which an IC chip having a built-in function unit (excluding a transmitting / receiving antenna) of a non-contact data carrier 20 is mounted. The internal component 1 of the non-contact data carrier is overlapped with a conductive sheet 5 entirely covered with a resin film 4, and further integrated with an exterior resin 6 so as to surround the whole.

The conductive sheet 5 is provided with a first cutout 5a having a shape corresponding to the outer shape of the radiation surface of the antenna coil 2, and the first cutout 5a
The inner part 1 of the non-contact data carrier and the conductive sheet 5 are overlapped so that only the center part of the radiation surface of the antenna coil 2 is exposed, so that the radiation part of the antenna coil 2 is partially overlapped around the antenna coil 2. A non-contact data carrier package having a configuration in which the conductive sheet 5 is arranged is realized.

The conductive sheet 5 has a first notch 5
In addition to a, a second notch 5b extending from the first notch 5a to the end of the conductive sheet 5 is provided.

Here, the material of the conductive sheet 5 is as follows.
Aluminum, copper, silver and the like can be mentioned, but any material having excellent conductivity can be used.

The resin film 4 hermetically seals the conductive sheet 5 to prevent corrosion of the conductive sheet 5. Examples of the material include a polyester resin, a polyethylene resin, a polypropylene resin, a polyamide resin, a polyimide film resin and the like which are excellent in sealing property and chemical resistance.

As described above, the non-contact data carrier package of the present embodiment has a configuration in which the conductive sheet 5 is arranged around the antenna coil 2 so as to partially overlap the radiation surface of the antenna coil 2. The radiation efficiency of the antenna coil 2 can be improved by optimally selecting various parameters such as the area, shape, and thickness of the conductive sheet 5 and the positional relationship with the antenna coil 2. It is possible to dramatically increase the distance.

A first notch 5a, which partially exposes the radiation surface of the antenna coil 2, is formed in the conductive sheet 5 and the first notch 5a.
By providing the second notch 5b extending from the notch 5a to the end of the conductive sheet 5, the communication distance can be further extended.

[0025]

Next, specific embodiments of the present invention will be described.

(Example 1) As shown in FIGS. 3 and 4, a copper wire having a diameter of 0.07 mm was used, and an inner diameter of 10 mm and an outer diameter of 1 mm were used.
A circular coil having a thickness of 8 mm and a thickness of 1.2 mm was prepared and used as an antenna coil 2. Next, both ends of the antenna coil 2 were soldered to terminals of an 8 mm square substrate 3 on which a circuit element such as a memory element was mounted, and the antenna coil 2 and the circuit element were electrically and physically joined.

On the other hand, as an electrically conductive sheet, an aluminum foil having a thickness of 0.05 mm was processed into a rectangular shape of 46 × 76 mm, and a circular shape having a radius of 6 mm centered at a position of 16 × 16 mm from one corner. Hole (first notch 5
a) was opened, and a 16 × 16 mm square portion was cut out from the corner (second notch 5 b). The conductive sheet 5 thus manufactured was surrounded by the polyethylene film 4.

Next, the antenna coil 2 is overlapped so that a portion including the center of the radiation surface of the antenna coil 2 is exposed from the circular hole (first notch 5a), and the whole is surrounded by a vinyl chloride sheet 6. And a non-contact data carrier package.

The communication distance of the non-contact data carrier package manufactured under the same conditions as the non-contact data carrier package of this embodiment except that the conductive sheet was not provided was compared. While the communication distance was 210 mm, the communication distance of the package of this embodiment was increased to 260 mm.

Example 2 As shown in FIGS. 1 and 2, a copper wire having a diameter of 0.07 mm was used to form an inner diameter of 10 mm and an outer diameter of 1 mm.
A circular coil having a thickness of 8 mm and a thickness of 1.2 mm was prepared and used as an antenna coil 2. Next, both ends of the antenna coil 2 were soldered to terminals of an 8 mm square substrate 3 on which a circuit element such as a memory element was mounted, and the antenna coil 2 and the circuit element were electrically and physically joined.

On the other hand, as an electrically conductive sheet, an aluminum foil having a thickness of 0.05 mm was processed into a rectangular shape of 46 × 76 mm, and a circular hole (first notch portion 5 a) having a radius of 5 mm from the center was formed. A 1 mm wide notch (second notch 5 b) was made from the hole 5 a to the end of the aluminum foil, and the conductive sheet 5 thus produced was surrounded by the polyethylene film 4.

Next, the antenna coil 2 is overlapped so that only the center portion of the radiation surface of the antenna coil 2 is exposed from the circular hole (first notch 5a), and the whole is covered with a vinyl chloride sheet 6.
To form a non-contact data carrier package.

A comparison was made of the communication distance between the non-contact data carrier package manufactured under the same conditions except that the conductive sheet was not provided and the non-contact data carrier package of the present embodiment. While the communication distance was 210 mm, the communication distance of the package of this embodiment was increased to 380 mm.

[0034]

As described above, according to the non-contact data carrier package of the present invention, the conductive member is arranged around the antenna coil so as to partially overlap the radiation surface of the antenna coil. By optimally selecting various parameters such as the area, shape, thickness, and positional relationship with the antenna coil, the radiation efficiency of the antenna coil can be increased, and the communication distance can be significantly extended.

Further, by providing the conductive member with the second notch extending from the first notch exposing a part of the radiation surface of the antenna coil to the end of the conductive member, the antenna coil is further improved. Radiation efficiency can be increased, and the communication distance can be extended.

[Brief description of the drawings]

FIG. 1 is a plan view showing a configuration of a contactless data carrier package according to a second embodiment of the present invention.

FIG. 2 is a sectional view of the contactless data carrier package of FIG. 1;

FIG. 3 is a plan view showing the configuration of the contactless data carrier package according to the first embodiment of the present invention.

FIG. 4 is a sectional view of the contactless data carrier package of FIG. 3;

FIG. 5 is a block diagram showing an overall configuration of a contactless data carrier system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Internal component of non-contact data carrier 2 ... Antenna coil 3 ... Substrate 4 ... Resin film 5 ... Conductive sheet 5a ... 1st notch 5b ... 2nd notch 6 ... Exterior resin

Claims (2)

[Claims] 1. A non-contact data carrier package having an antenna coil, wherein a conductive member is arranged around the antenna coil so as to partially overlap a radiation surface of the antenna coil. package. 2. The non-contact data carrier package according to claim 1, wherein the conductive member has a first notch for partially exposing a radiation surface of the antenna coil, and a first notch for exposing a part of the radiation surface of the antenna coil. A non-contact data carrier package having a second cutout extending over an end of the conductive member.