Magnetic stripe cards description:
English Name: magnetic card
A card-type magnetic recording medium, a magnetic stripe reader with complexation. Magnetic recording is the use of some information of the magnetic carrier, used to identify the identity of the card or other purposes.
Use different stripe magnetic stripe cards, a common magnetic stripe, Green stripe, stripe Chur, pitched stripe
Magnetic easy to use, cost cheap, extremely versatile, can be used to make credit cards, bank cards, subway cards, bus cards, membership cards, loyalty cards, supermarket membership card, prepaid consumer cards, phone cards; electronic game cards, and various traffic charges cards. Today, in many cases we will use the card, as in the canteen, at the mall shopping, phone calls, and so on into the control area.
Magnetic stripe track:
There are three tracks on the magnetic strip. Track 1, track 2, track 3 is read and write tracks, in use can be read out can be written.
Track 1 can record digital (0-9), letters (A-Z) and some other symbols (such as brackets, separators, etc.), the largest record 79 numbers or letters.
Track 2 and 3 characters recorded only numbers (0-9). Track 2 recorded maximum 40 characters, tracks three maximum recordable 107 characters. Need to contact Wang 13828760722 qq: 1005412312 Website: www.iccardcm.com
Magnetic stripe is material (also known as pigment) directed by arrangement consisting of iron oxide particles in a thin layer. Tightly bonded together with a resin adhesive, the adhesive and the paper or plastic such as a non-magnetic substrate media.
Essentially sense the magnetic stripe and the computer tape or disk is the same, it can be used to record letters, characters and digital information. Plastic or paper card firmly together by gluing or heat formed together. The information contained in the magnetic stripe is generally larger than the length of the bar code. The magnetic strip can be divided into three separate tracks, called TK1, TK2, TK3, TK1 up to write 79 letters or characters; TK2 can write up to 40 characters; TK3 up to write 107 characters. Due to the low magnetic cost, easy to use, easy to manage, and has certain safety features, so it‘s been a lot of development of world-renowned companies, particularly national government departments utmost support for decades, making the card application is very popular all over the national life aspects. It is worth mentioning that a few years to promote the use of the banking system in general makes the card penetration has been a great development.
Category:
Magnetic stripe type: General anti-magnetic card (300oe) high resistance to magnetic cards (3500oe) painted directly printed type: low coercive force card (300oe) (eg: Park tickets) high resistance to magnetic cards (2700oe) (eg: Metro cards, phone cards )
Applications:
Bank cards, securities, insurance: credit card, quasi-credit card, ATM cards, ATM cards, debit cards, debit cards, special cards, stored value cards, co-branded cards, business cards, personal cards, corporate cards, social insurance cards, social security cards, securities trading card ...
Retail Services: shopping cards, cash cards, membership cards, gift cards, ordering cards, discount cards, loyalty cards, etc.
Social Security: Life and accident insurance cards, health cards
Transport Travel: Car insurance cards, travel cards, room card lock, passport card, parking card, pay TV cards, highway-paid cards, check cards
Medical: patient cards, health check card, blood donor cards, picture cards diagnosis, blood type card, health record cards, maternity card, medical card, insurance card, prescription card
Special documents: identity card, temporary residence card, seal registration card, tax-free card ...
Education: CAI card, library card, student card, report cards, counseling cards, score cards ...
Entertainment: video card, Kara OK cards, entertainment cards, cinemas card
Other: Factory Automation card, operator cards, quality control cards, access control cards, job cards, personal record cards, home security cards, etc.
4 History needs, please contact Wang 13828760722 qq: 1005412312 Website: www.iccardcm.com
Attention problems
Magnetic stripe cards will be many external magnetic interference factors
☆ magnetic stripe cards in your wallet, wallet distance Cikou too close, or even contact with Cikou occur.
☆ Ms. handbags, men‘s handbags Cikou too close or touch.
☆ with magnetic seals and contacts, notebook touch.
☆ sleeve Cikou contact with the cell phone, car keys and other magnetic objects.
☆ with phone equipment and other electromagnetic radiation can produce long together.
☆ with televisions, tape recorders and other household appliances from the effects of a strong magnetic field is too close.
☆ When supermarkets use, security and supermarkets with degaussing equipment too close or even touch.
☆ multiple magnetic stripe cards together, the two cards magnetic stripe contact with each other.
In addition, magnetic stripe cards pressure was off, long bump, exposure, temperature, magnetic stripe scratched dirty, also will not work properly with magnetic stripe cards. Meanwhile, process credit card transactions on the card reader, the cleaning head, aging, data transmission interference, system malfunction, cashier so may result in improper operation of a magnetic stripe card can not be used.
6 Principle
Recording principle
The recording head has a gap from the inside of the annular core and a coil wound on the core composition. Magnetic evenly coated sheet and a base sheet of a material
Magnetic swipe card reader
The above base particle of a magnetic material. During recording, the magnetic surface of the magnetic card at a constant speed, or a recording head moving at a constant speed, and a magnetic recording head, and the voids or surface contact, respectively. Once the current flows through the magnetic head coil, and a gap is generated at a magnetic field proportional to the current, so the contact portion of the magnetic gap with the magnetic body is magnetized. If the recording signal current varies over time, then the magnetic card when the magnetic material through the gap (due to the movement of a magnetic card or a magnetic head), it varies with the degree of change in current being magnetized. After the card has been magnetized, the magnetic gap of the magnetic layer is left on the left corresponding to the current change in the remanence.
If the current signal (or magnetic field strength) by sine law change, then the residual magnetic flux on also varies by sine law. When the current is positive, it causes a left to right (from N to S) of the magnetic polarity; When the current is reversed, the magnetic properties also follow the reverse. The end result can be seen from the magnetic card and then return to S N to N wavelength, can be seen as two in contact with the magnet polarity. This is to some extent simplified result However, it must be remembered that the remanence Br is a sinusoidal change. When the signal current is maximum, the vertical magnetic flux density maximum. Signal is recorded in the form of a sinusoidal variation of the residual magnetization recorded, stored in the magnetic card.
Works
Residual magnetic flux density Br above plays a decisive role in the course of their work card. Card equipped with a constant speed through the work of the magnetic head coil, the external magnetic field lines of the magnetic coil is cut, an induced electromotive force in the coil, so that the transmission of the signal to be recorded. Of course, also required to be recorded in the magnetic card to work with a wide frequency response of the signal, the higher the smaller the distortion and output level.
A very fine metal line can be used as a simple reproducing apparatus. Close to the straight line and the magnetic metal, a direction perpendicular to the running direction of the magnetic card, card operation, the metal cutting straight magnetic field lines and to generate an induced electromotive force is proportional to the size of the magnetic lines of force in cutting. When the running speed of the card is kept constant, the induced electromotive force of the metal magnetic line residual magnetic flux density is proportional to the surface, and the induced electromotive force of the conductor represented by the formula:
e = BrWv where Br - surface residual magnetic flux density;
Magnetic stripe card mounted machine
W - the width of the track track;
v - the playback speed of the magnetic card.
In Br = 2πf / vφrmcos2πft case, and e Br integrated relationship to obtain e = 2πfWφrmcos2πft. Of course, as with a magnetic metal wire working machine, the output is very small, therefore it is not practical.
The head is the core of soft magnetic material made of high permeability, winding coils wrapped around the top, in front of the head there is a very narrow gap, then head of the magnetic flux to enter the work is concerned, can be seen as two effective reluctance parallel, i.e. the gap reluctance and the reluctance of the magnetic head core. Since the effective air gap reluctance of the magnetic head core is much greater than the reluctance of the work, so the majority of the magnetic flux is input to the magnetic head core and the cross-linking occurs on the working head and the coil winding, and thus the induced electromotive force, in this case, formula of the induced electromotive force, a single metal wire obtained reproduced fully applicable to work the annular magnetic head, the scale factor is different.
Let N be the number of turns of the coil, the induced electromotive force and the size m of the magnetic head and the magnetic core is related to the work of the coefficient, the annular working head is produced by winding: e = 2πfWmNφrmcos2πft
Because the working magnetic force induced in the winding is proportional to the rate of change of the magnetic flux, i.e., the frequency of the electromotive force e α By α f. When recording i = Isinwt, longitudinal remanence density Bx α i (the straight portion of the transfer curve), so that, Bx = K1Isinwt. Since By α dbx / dt, e α By, therefore, e = K2Iwcoswt. K2 here depends on the operating efficiency of the magnetic head, the number of turns, magnetic materials. These formulas also show that: the output voltage is proportional to the recording current; output voltage is proportional to the signal frequency; corresponding change in the output voltage by 90 ° (i.e., by changing to sine cosine).
7 Standard
International Standard
1. ISO 7810: 1985 Identification cards - Physical characteristics
Describes the physical properties of the card, including card materials, configurations, dimensions.
Size cards are: width 85.72mm ---- 85.47mm
Height 54.03mm ---- 53.92mm
Thickness of 0.76 ± 0.08mm
Card corners radius 3.18mm
Generally speaking card size is: 85.5 X 54 X 0.76
2. ISO 7811-1: 1985 Identification cards - Recording technique - Part 1: letterpress
Specifies the requirements for embossed characters on the card (character sets, fonts, character spacing and character height).
3. ISO 7811-2: 1985 Identification cards - Recording technique - Part 2: Magnetic stripe
Specifies the characteristics of the magnetic stripe on the card, coding techniques and coded character sets.
4. ISO 7811-3: 1985 Identification cards - Recording technique - Part 3: Location on ID-1 type card embossed characters
5. ISO 7811-4: 1985 Identification cards - Recording technique - Part 4: 1,2 track position read-only track
6. ISO 7811-5: 1985 Identification cards - Recording technique - Part 5: read track 3 track position
Factory standard
(According to ISO7811, ISO7816 international standard)
① kaki Size Standard: kaki Length: 85.47mm-85.72mm Width: 53.92mm-54.03mm
ISO standard (magnetic) Thickness: 0.76mm (excluding magnetic stripe thickness) IC Card Thickness: 0.84mm ± 0.02mm
Special Thickness: According to the demand side produced the error is ± 0.03mm
Printing Process: According to the needs of different users, there are a variety of printing offset printing, screen printing, printing, etc., and even printed in one of a variety of printing methods, and can increase the bronzing, hot silver and other special craft special edition on the cards according to the needs, users need in order to achieve the best quality and visual needs.
8 security
With the continuous expansion card application, the relevant card technology, especially security technology has been more and more difficult to meet the demand for higher application security requirements. Before the card application security technologies, such as watermarking technology, holographic technology, precision magnetic recording technology, over time their relative safety has been greatly reduced. The basic principle is to work on its own, "Card Number" to identify different card, so the card reader in the relatively open, relatively easy to copy.
IC card (a smart card chip) is carried out to identify the key parameters and some writing on the chip. IC card, when used, must be passed with a two-way between the read-write device-specific key authentication. At the factory, the IC card is initialized first (encrypted); needed by the IC card issuance system to be delivered, to generate a private key for each user their own card systems.
Appeared visible card.
Problems
A. Confidentiality and security of the card is poor
Information on the magnetic strip is read out relatively easily and illegally modify the contents of the magnetic stripe is also easier, in most cases it is used as a static magnetic data are input. Although the first three tracks can read and write, and have the amount field, it is only for a small amount of application areas, such as phone cards.
B. Using the card application systems need to support reliable computer system and the central database
In the financial sector, as a financial transaction card, magnetic card, usually with a strong, reliable computer network system, the amount of transaction records and other information, are stored in a database of financial institutions of the computer, the card user held only provide the user‘s primary account number, etc. index information, easy to quickly find the user data in the database.
The main advantages of the card: the low cost, which is the reason it is easy to promote.
