CN210742989U - Smart card structure with built-in photoresistor - Google Patents
Smart card structure with built-in photoresistor Download PDFInfo
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- CN210742989U CN210742989U CN201922139975.3U CN201922139975U CN210742989U CN 210742989 U CN210742989 U CN 210742989U CN 201922139975 U CN201922139975 U CN 201922139975U CN 210742989 U CN210742989 U CN 210742989U
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Abstract
The utility model belongs to the technical field of radio frequency identification safety, specifically provide a built-in photo resistance's smart card structure, including the card, be equipped with safety chip and antenna coil on the card, still be equipped with photo resistance on the card, photo resistance with concatenate through antenna coil between the safety chip and form passive loop circuit. The radio frequency identification circuit who constitutes at security chip and antenna coil concatenates the photo resistance, just can make the radio frequency identification circuit switch on when the photo resistance senses illumination, and the smart card just can normally work, and when the photo resistance did not sense illumination, the radio frequency identification circuit disconnection, the information of smart card can't be read by the radio frequency source, realizes the function of smart card locking. The switch of the whole antenna is realized through the sensitization of the photosensitive resistor of the intelligent card, so that the switch-on function of the antenna in the control card is realized, the non-contact function of the intelligent card is realized, the purpose of preventing the intelligent card from being stolen and swiped is achieved, and the safety of the intelligent card is improved.
Description
Technical Field
The utility model belongs to the technical field of radio frequency identification safety, concretely relates to built-in photo resistance's smart card structure.
Background
Smart cards (Smart cards) are a generic term for plastic cards (usually the size of a credit Card) with a microchip embedded therein. According to the exchange interface, the method can be divided into: contact smart cards, contactless smart cards and dual interface smart cards. Non-contact Radio Frequency Identification (RFID) is an abbreviation of Radio Frequency Identification, and is mainly distinguished by whether an antenna is arranged in a card or not and whether a contact is arranged on the surface of the card or not to contact with a circuit of a read-write device. The 13.56MHz high-frequency intelligent card belongs to a non-contact or double-interface intelligent card with an antenna inside. In China, with the continuous deep development of gold card engineering construction, the smart card is widely applied in a plurality of fields, and good social benefit and economic benefit are obtained. In particular, in the smart card family, the non-contact smart card (inductive smart card) has the characteristics of high capacity, high reliability (avoiding the influence of foreign matter pollution caused by mechanical contacts), safety, anti-counterfeiting, simple operation and long service life (the number of read/write times is up to more than 10 ten thousand), and is increasingly emphasized in various smart card application projects. Although the contactless smart card has great convenience in use, some problems needing improvement appear in the process, such as the problem of close embezzlement of bank cards due to the non-contact quick flash payment function of the bank cards.
Disclosure of Invention
The utility model aims at overcoming the problem that among the prior art non-contact smart card security performance is low.
Therefore, the utility model provides a built-in photo resistance's smart card structure, including the card, be equipped with safety chip and antenna coil on the card, still be equipped with photo resistance on the card, photo resistance with concatenate through antenna coil between the safety chip and form the passive loop circuit.
Preferably, the security chip and the photoresistor are respectively located at two ends of the card.
Preferably, the photosensitive resistor is embedded in the card, a blind hole is formed in the card corresponding to the photosensitive resistor, and the photosensitive resistor is communicated with the outside through the blind hole.
Preferably, the opening of the blind hole is sealed with light-transmitting glass.
Preferably, the coverage area of the blind hole is smaller than or equal to the surface area of the photoresistor.
Preferably, the card is a rectangular plastic block, and the antenna coil is located at the outer edge of the rectangular plastic block.
Preferably, the antenna coil is a 13.56Mhz high frequency induction radio frequency identification coil.
The utility model has the advantages that: the utility model provides a smart card structure of this kind of built-in photo resistance, including the card, be equipped with safety chip and antenna coil on the card, still be equipped with photo resistance on the card, photo resistance with concatenate through antenna coil between the safety chip and form the passive loop circuit. The radio frequency identification circuit who constitutes at security chip and antenna coil concatenates the photo resistance, just can make the radio frequency identification circuit switch on when the photo resistance senses illumination, and the smart card just can normally work, and when the photo resistance did not sense illumination, the radio frequency identification circuit disconnection, the information of smart card can't be read by the radio frequency source, realizes the function of smart card locking. The switch of the whole antenna is realized through the sensitization of the photosensitive resistor of the intelligent card, so that the switch-on function of the antenna in the control card is realized, the non-contact function of the intelligent card is realized, the purpose of preventing the intelligent card from being stolen and swiped is achieved, and the safety of the intelligent card is improved.
The present invention will be described in further detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram of an internal passive loop circuit structure of a smart card structure with a built-in photo resistor according to the present invention;
fig. 2 is an external schematic structural diagram of the smart card structure with built-in photo resistors of the present invention.
Description of reference numerals: the safety chip comprises a safety chip 1, an antenna coil 2, a photosensitive resistor 3 and a blind hole 4.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the operation of an RFID (video identification) system, radio frequency energy is transmitted by a reader in an area to form an electromagnetic field, the size of the area depending on the transmission power. Tags within the coverage area of the reader are triggered to transmit data stored therein or to modify data stored therein in accordance with the reader's instructions and can communicate with a computer network via an interface. The NFC initiator (also called the master) in passive mode requires a power supply device, and the master uses the power of the power supply device to provide a radio frequency field and send data to the NFC target.
Although the contactless smart card has great convenience in use, some problems needing improvement appear in the process, such as the problem of close embezzlement of bank cards due to the non-contact quick flash payment function of the bank cards. In view of the above, it is actually necessary to provide a method for controlling the conduction of the contactless antenna through the physical switch, so as to improve the safety of the anti-theft brush. The embodiment of the utility model provides a built-in photo resistance's smart card structure, including the card, be equipped with safety chip 1 and antenna coil 2 on the card, still be equipped with photo resistance 3 on the card, photo resistance 3 with concatenate through antenna coil 2 between the safety chip 1 and form the passive loop circuit.
Therefore, as shown in fig. 1 and 2, a security chip 1 is generally installed in a smart card such as a credit card, and particularly, an induction loop composed of the security chip 1 and an antenna coil 2 is installed in a card with a radio frequency identification function, when the smart card with the radio frequency identification function approaches an emission source, the induction loop in the smart card is automatically conducted to form a circuit loop, so that information of the chip is read. The scheme is characterized in that the photoresistor 3 is connected in series in the circuit loop, so that the photoresistor 3, the safety chip 1 and the antenna coil 2 form a passive loop circuit. The photo-resistor 3 is normally off, that is, when no light irradiates on the photo-resistor 3, the resistance value of the photo-resistor is very large, which results in that the passive loop is equivalent to an off state, therefore, when the smart card is close to the emission source, because the passive loop circuit cannot be conducted, is in the off state, and cannot respond, the information in the smart card cannot be read. When the card holder irradiates the light on the light sensitive resistor 3, the resistance of the light sensitive resistor 3 is rapidly reduced, so that the passive loop circuit in the intelligent card is conducted, and the intelligent card can respond to the emission source to exchange signals. The on and off of the passive loop circuit is formed by active illumination of a card holder, so that the conduction function of an antenna in the control card is achieved, the non-contact function of the intelligent card is realized, the purpose of preventing the intelligent card from being stolen and swiped is achieved, and the safety of the intelligent card is improved.
The photoresistor 3 is a special resistor made of semiconductor materials such as sulfide insulator or selenide insulator, and the working principle of the photoresistor is based on the internal photoelectric effect. The stronger the illumination is, the lower the resistance value is, and the resistance value is rapidly reduced along with the increase of the illumination intensity, and the bright resistance value can be reduced to below 1K omega. The photoresistor 3 is very sensitive to light, and is in a high-resistance state in the absence of illumination, and the dark resistance can generally reach 1.5M omega.
The preferred scheme is characterized in that: the safety chip 1 and the light-sensitive resistor 3 are respectively positioned at two ends of the card. Therefore, the safety chip 1 is far away from the photoresistor 3, and the reaction sensitivity and the sensitivity of the safety chip and the photoresistor which are influenced by electromagnetic interference caused by too close proximity are avoided.
According to the preferable scheme, the photosensitive resistor 3 is embedded in the card, a blind hole 4 is formed in the card corresponding to the photosensitive resistor 3, and the photosensitive resistor 3 is communicated with the outside through the blind hole 4. The photosensitive resistor 3 is embedded relatively safer with in the card, is difficult for droing, then communicates with each other with the external world through blind hole 4, when needs use the card, only needs with the light irradiation in blind hole 4, is located the photosensitive resistor 3 alright in blind hole 4 with sense illumination to make passive return circuit realize the purpose that switches on, when removing the illumination, passive return circuit automatic disconnection.
In a preferable scheme, the opening of the blind hole 4 is sealed with light-transmitting glass. On one hand, the light-transmitting glass can realize the sealing function and prevent dust or water vapor from entering the card; on the other hand, the transparent glass has the function of light transmission, and the light can reach the photosensitive resistor 3 through the transparent glass.
Preferably, the coverage area of the blind hole 4 is smaller than or equal to the surface area of the photoresistor 3. The photoresistor 3 is sensitive to light, and only the light needs to enter, and a large blind hole 4 does not need to be formed, so that external dust entering due to overlarge holes is avoided.
Preferably, the card is a rectangular plastic block, and the antenna coil 2 is located at the outer edge of the rectangular plastic block. As shown in fig. 1, the antenna coil 2 surrounds the outer edge of the rectangular plastic block, and the larger the coil is, the easier it is to sense the emission source of radio frequency, so that the sensing sensitivity of the chip is improved.
Preferably, the antenna coil 2 is a 13.56Mhz radio frequency identification coil. The technical scheme is mainly suitable for the 13.56MHz high-frequency smart card. Or smart cards of other application scenarios, not shown here.
The utility model has the advantages that: the utility model provides a smart card structure of this kind of built-in photo resistance 3, including the card, be equipped with safety chip 1 and antenna coil 2 on the card, still be equipped with photo resistance 3 on the card, photo resistance 3 with concatenate through antenna coil 2 between the safety chip 1 and form the passive loop circuit. The radio frequency identification circuit who constitutes at security chip 1 and antenna coil 2 concatenates photo resistance 3 in, just can make the radio frequency identification circuit switch on when photo resistance 3 senses illumination, and the smart card just can normally work, and when photo resistance 3 did not sense illumination, the radio frequency identification circuit disconnection, the information of smart card can't be read by the radio frequency source, realizes the function of smart card locking. The switch of whole antenna is realized through the sensitization of the photo resistance 3 of smart card promptly to reach the interior antenna of control card and switch on the function, realize the non-contact function of smart card, reach the purpose that prevents to steal the smart card, improved the safety of smart card.
The above examples are merely illustrative of the present invention and do not limit the scope of the present invention, and all designs identical or similar to the present invention are within the scope of the present invention.
Claims (7)
1. The utility model provides a built-in photo resistance's smart card structure, includes the card, be equipped with safety chip and antenna coil on the card, its characterized in that: the card is also provided with a photoresistor, and the photoresistor and the safety chip are connected in series through an antenna coil to form a passive loop circuit.
2. The smart card architecture with built-in photo resistors of claim 1, wherein: the safety chip and the photoresistor are respectively positioned at two ends of the card.
3. The smart card architecture with built-in photo resistors of claim 1, wherein: the photosensitive resistor is embedded in the card, a blind hole is formed in the card corresponding to the photosensitive resistor, and the photosensitive resistor is communicated with the outside through the blind hole.
4. A smart card structure with built-in photo resistor according to claim 3, characterized in that: and the opening of the blind hole is sealed with light-transmitting glass.
5. A smart card structure with built-in photo resistor according to claim 3, characterized in that: the coverage area of the blind hole is smaller than or equal to the surface area of the photoresistor.
6. The smart card architecture with built-in photo resistors of claim 1, wherein: the card is a rectangular plastic block, and the antenna coil is located on the outer edge of the rectangular plastic block.
7. The smart card architecture with built-in photo resistors of claim 6, wherein: the antenna coil is a 13.56Mhz high-frequency induction radio frequency identification coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922139975.3U CN210742989U (en) | 2019-12-04 | 2019-12-04 | Smart card structure with built-in photoresistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922139975.3U CN210742989U (en) | 2019-12-04 | 2019-12-04 | Smart card structure with built-in photoresistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210742989U true CN210742989U (en) | 2020-06-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922139975.3U Active CN210742989U (en) | 2019-12-04 | 2019-12-04 | Smart card structure with built-in photoresistor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210742989U (en) |
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2019
- 2019-12-04 CN CN201922139975.3U patent/CN210742989U/en active Active
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