A kind of smart cardTechnical field
The application relates to technical field of intelligent card, particularly to a kind of smart card.
Background technology
Along with the rise of mobile payment, experiencing for promoting the payment of swiping the card of user, Unionpay's tissue starts to promote NFC smart cardExempt from close payment function.But noninductive operation when using NFC to exempt from close payment is also stolen individual's Ka Nei finance for lawless person and is increasedHaving added feasibility, in crowded compartment or on crowded square, lawless person can utilize the card reader transformed canMoment completes small amount and steals brush.
So, it is to avoid user becomes problem demanding prompt solution at the most stolen brush, as long as current technology has bandThe antenna protection set of magnetic shield function, owing to the magnetic field of card reader cannot cover into NFC coil through antenna protection, and protectsSmart card security, but user needs individually to buy cutting ferrule, and when using every time draw card and the process of being installed adds userThe triviality of operation.
Summary of the invention
It is an object of the invention to improve the safety of smart card, it is provided that one can prevent from automatically being read by card reader dataSmart card.
For reaching above-mentioned purpose, the technical scheme is that a kind of smart card of offer, this smart card includes safety chipAnd coil antenna, also include that touch switch, described touch switch include resistive touch sheet, measuring resistance, signal detectionDevice and logical judgment device, wherein resistive touch sheet is positioned at the surface of smart card, measuring resistance and signal detector and is positioned at intelligenceCard is internal, and logical judgment device is integrated in inside safety chip, the resistance value phase of the resistance value of resistive touch sheet and measuring resistanceDeng, both use parallel way to be connected respectively to signal detector；Wherein, signal detector is used for detecting resistive touch sheet and isThe no resistance variations that exists, and export corresponding detectable signal, logical judgment device is for carrying out the detectable signal received pointAnalysis, it is judged that whether user passes through finger contacts with resistive touch sheet, and according to judged result export whether allow outsidePortion's card reader reads the control signal of the data in safety chip.
Alternatively, the quantity of resistive touch sheet is a piece of, is arranged on front or the reverse side of smart card.
Alternatively, touch switch also includes two amplifying circuits, and one of them amplifying circuit is arranged on resistive touchBetween sheet and signal detector, another amplifying circuit is arranged between measuring resistance and signal detector.
The present invention provide smart card include touch switch, when not using smart card, smart card to card reader without soundShould；When user prepares to swipe the card, only need to remove to contact the resistive touch sheet on smart card surface, the electricity of resistive touch sheet with fingerResistance will change, and the current value by resistive touch sheet is entered by signal detector with the current value by measuring resistanceRow contrast, and export corresponding detectable signal, the detectable signal received is analyzed by logical judgment device, it is judged that whether userPass through finger to contact with resistive touch sheet, and whether allow external card reader to read safety according to judged result outputThe control signal of the data in chip, thus effectively prevent the dangerous row that intelligent card data is read automatically by card readerFor.
Alternatively, described smart card also includes push switch, and push switch is connected with coil antenna, control coil skyThe disconnection of line and Guan Bi, only when coil antenna closes, just allow external card reader to read the data in safety chip.
Preferably, push switch is only connected with a circle antenna of coil antenna inner side.
Preferably, push switch is slim switch.
Preferably, the thickness of slim switch is less than the thickness of smart card.
Preferably, slim switch package is on flexible PCB.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present application or technical scheme of the prior art, below will be to embodiment or existingIn having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only thisSome embodiments described in application, for those of ordinary skill in the art, it is also possible to obtain other according to these accompanying drawingsAccompanying drawing.
Fig. 1 is the structure chart of the smart card including resistive touch sheet in the embodiment of the present invention one；
Fig. 2 is the smart card architecture figure including capacitance touch sheet in the embodiment of the present invention two；
Fig. 3 is the smart card architecture figure including push switch in the embodiment of the present invention three.
Description of reference numerals:
1-smart card；2-safety chip；3-coil antenna；4-touch switch；401-resistive touch sheet；402-standardResistance；403-signal detector；404-logical judgment device；405-the first amplifying circuit；406-the second amplifying circuit；5-pressing typeSwitch.
Detailed description of the invention:
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, completeDescribe, it is clear that described embodiment is a part of embodiment of the present invention rather than whole embodiments wholely.Based on thisEmbodiment in bright, the every other enforcement that those of ordinary skill in the art are obtained under not making creative work premiseExample, broadly falls into the scope of protection of the invention.
Embodiment one
The embodiment of the present invention one provides a kind of smart card 1, as it is shown in figure 1, this smart card 1 includes safety chip 2 and lineCircle antenna 3, also includes that touch switch 4, described touch switch 4 include resistive touch sheet 401, measuring resistance 402, signalDetector 403 and logical judgment device 404, wherein resistive touch sheet 401 is positioned at the surface of smart card 1, measuring resistance 402 and letterIt is internal that number detector 403 is positioned at smart card 1, and it is internal that logical judgment device 404 is integrated in safety chip 2, resistive touch sheet 401 withThe resistance value of measuring resistance 402 is equal, and both use parallel way to be connected respectively to signal detector 403, wherein, signal detectionDevice 403 is used for detecting whether resistive touch sheet 401 exists resistance variations, and exports corresponding detectable signal, logical judgment device404 for being analyzed the detectable signal received, it is judged that whether user passes through finger is carried out with resistive touch sheet 401Contact, and whether allow external card reader to read the control signal of the data in safety chip 2 according to judged result output.
Exemplarily, the detectable signal that signal detector 403 sends can be: when the resistance value of resistive touch sheet 401During change, the resistance value of resistive touch sheet 401 is different from the resistance value of measuring resistance 402, by resistive touch sheet 401Current value is different from by the current value of measuring resistance 402, and detectable signal is 1, when the resistance value of resistive touch sheet 401 is constantDuring change, the resistance value of resistive touch sheet 401 is identical with the resistance value of measuring resistance 402, by the electricity of resistive touch sheet 401Flow valuve is identical with by the current value of measuring resistance 402, and detectable signal is 0.
Exemplarily, the resistive touch sheet 401 in the embodiment of the present invention can be by temperature-sensitive resistor or humidity sensitivePrepared by the materials such as resistance, the embodiment of the present invention a pair this be not defined, if choosing temperature-sensitive resistor material preparation electricityResistive touch sheet 401, then, after experiencing the temperature that finger transmits, resistive touch sheet 401 self-resistance value can occur to strain mutuallyChanging, further, voltage one timing can be changed by the current value of this resistive touch sheet 401, passes through signal detectorIt is compared by 403 with by the current value of measuring resistance 402, signal detector 403 when two current value differences being detected,Export corresponding detectable signal, logical judgment device 404 can according to this detectable signal judge user whether pass through finger withWhether this resistive touch sheet 401 contacts, and allow external card reader to read in safety chip 2 according to judged result outputThe control signal of data.
The smart card that the embodiment of the present invention one provides provides touch switch 4, when not using smart card 1, and smart card 1To card reader without response；When user prepares to swipe the card, only need to remove to contact the resistive touch sheet 401 on smart card 1 surface with finger,The resistance value of resistive touch sheet 401 will change, and signal detector 403 is by the electric current by resistive touch sheet 401Value contrasts with by the current value of measuring resistance 402, thus detects the resistance variations signal of resistive touch sheet 401,The resistance variations signal that logical judgment device 404 received signal detector 403 sends, it is judged that whether user passes through finger and resistanceFormula touch sheet 401 contacts, and controls whether the number allowing external card reader to read in safety chip 2 according to judged resultAccording to, thus effectively prevent the unsafe act that the data in smart card 1 are read automatically by card reader.
Alternatively, the quantity of resistive touch sheet 401 is a piece of, is arranged on front or the reverse side of smart card 1, when withWhen family prepares to swipe the card, taking out smart card 1, the single chip resistance formula touch sheet 401 on contact smart card 1 surface starts smart card in passing1, the most easy to use, and effectively prevent the dangerous row that the data in smart card 1 are read automatically by external card readerFor.
Alternatively, touch switch 4 also includes two amplifying circuits, and one of them amplifying circuit is arranged on resistive touchBetween sheet 401 and signal detector 403, another amplifying circuit is arranged between measuring resistance 402 and signal detector 403,It is respectively used to carry out signal amplification to by the current value of resistive touch sheet 401 and measuring resistance 402, improves signal detector403 accuracy being used for acquisition of signal.
It addition, for the smart card 1 carrying external contact, when it swipes the card mode for contact, user promotes intelligenceCard 1 so that it is externally the draw-in groove of card reader slides, and is read out the data in smart card 1, and now, whether user touchesIt is positioned at the resistive touch sheet 401 on smart card 1 surface contact is swiped the card process and does not produce impact.
Embodiment two
As in figure 2 it is shown, the smart card in the embodiment of the present invention two is identical with smart card 1 structure in embodiment one, differenceIt is the resistive touch sheet 401 in touch switch and measuring resistance 402 replace with capacitance touch sheet 407 and mark respectivelyPseudo-capacitance 408.The suitableeest relative to other structures that the resistive touch sheet 401 in embodiment one and measuring resistance 402 are arrangedFor capacitance touch sheet 407 and standard capacitance 408, the most no longer repeat.
Exemplarily, capacitance touch sheet 407 can be prepared by materials such as temperature sensitive electrical perhaps humidity sensitive capacitance,This is not defined by the present embodiment two.In the case of voltage is certain, the electric charge at electric capacity the two poles of the earth is distributed according to Q=CU rule,In electric capacity, no current flows through, if choosing temperature sensitization capacitance material to prepare capacitance touch sheet 407, then experiences finger and transmitsTemperature after, the also generation respective change of capacitance touch sheet 407 selfcapacity amount, capacitance change when, quantity of electric charge phaseAlso should can change, while the quantity of electric charge changes, charging and discharging currents can be produced, grow out of nothing, the most stable, electric current involution inZero, so it is contrasted with by standard capacitance 408, it is possible to judge whether user passes through finger and this condenser typeTouch sheet 407 contacts, and controls whether the data allowing external card reader to read in safety chip 2 according to judged result.
Embodiment three
As it is shown on figure 3, based on embodiment one or embodiment two, the smart card 1 in the embodiment of the present invention three also include byPusher-type switch 5, push switch 5 is connected with coil antenna 3, for disconnection and the Guan Bi of control coil antenna 3, only works as coilWhen antenna 3 closes, external card reader is just allowed to read the data in safety chip 2.
Wherein the operating frequency of coil antenna 3 is 13.56MHz, also known as NFC antenna, for realizing the near of two equipment roomsField communication；Exemplarily, coil antenna 3 be shaped as rectangle, circle or other set shapes any one, the present embodiment threeThis is not defined；Exemplarily, the processing technology of coil antenna 3 is PCB, copper cash be wound around or copper etching in any one,This is not defined by the present embodiment three.
Preferably, a push switch 5 only circle antenna with coil antenna 3 inner side is connected, only to the circle insideThe operation that antenna turns off and closes, it is possible to realize disconnection and the Guan Bi of coil antenna 3, simple to operate.
Exemplarily, when user does not uses smart card 1, making push switch 5 be in the state of upspringing, coil antenna 3 breaksOpen；When user prepares to swipe the card, press down on push switch 5 and make coil antenna 3 turn on；Swiping the card in carrying out, user keeps pressingSmart card 1 is also pressed close to external card reader by pressure condition；After external card reader prompting has been swiped the card, unclamp push switch 5, coilAntenna 3 disconnects.Exemplarily, the surface of smart card 1 should be provided with the station location marker of push switch 5, facilitates user according to markPosition is gone to operate this push switch 5.
Preferably, push switch 5 is slim switch, and its thickness is less than the thickness of smart card 1.
Preferably, slim switch package is on flexible PCB, and the push switch 5 using this technological forming can be withThe suppleness coupling of smart card 1.Furthermore, it is possible to push switch 5, safety chip 4 are sealed by resin together with coil antenna 3It is loaded on smart card 1 internal, retains the existing gossamery advantage of smart card 1 by overall package technique.
As it has been described above, the smart card 1 that the embodiment of the present invention three provides includes push switch 5, when user does not use intelligenceWhen blocking 1, smart card 1 to external card reader without response；Only when user prepares to swipe the card, 5 will be in pressed state by compressing switch,Smart card 1 could be started when making coil antenna 3 close, the most easy to use, and effectively prevent the data in smart card 1Automatically the unsafe act read by external card reader.
Similarly, for carrying the smart card 1 of external contact, when it swipes the card mode for contact, enforce intelligence1 can be blocked so that it is externally the draw-in groove of card reader slides, thus is read out the data in smart card 1, and now, user whetherOperate and do not produce impact by 5 contact the is swiped the card processes that compress switch.
Although having been described for the preferred embodiment of the application, but those skilled in the art once know basic creationProperty concept, then can make other change and amendment to these embodiments.So, claims are intended to be construed to include excellentSelect embodiment and fall into all changes and the amendment of the application scope.Obviously, those skilled in the art can be to the applicationCarry out various change and modification without deviating from spirit and scope.So, if these of the application are revised and modificationBelong within the scope of the application claim and equivalent technologies thereof, then the application is also intended to comprise these changes and modification existsIn.