TICKET PROVIDED WITH A MAGNETIC LAYER, AND A CORRESPONDING APPARATUS FOR TICKET EMISSION, VALIDATION AND INSPECTION

Abstract: A ticket provided with a magnetic layer (2) comprising information by the state of magnetization. The ticket comprises a thin carrier (2) and the magnetic layer (2) is constituted by a stripe extending along a direction of the carrier, wherein information is recorded in the magnetic layer (2) in discrete spots thereof, which are magnetized normal to the plane of the layer (2). The carrier (1) comprises in addition to the information carrying stripe a distinct synchronizing stripe (12) extending in parallel with the magnetic layer (2) and consists of periodically repeated sections each being associated with respective one of said spots. The reading of the so recorded information might occur by means of a Hall detector. Owing to the synchronizing stripe (12) and the direction of magnetization the speed of ticket insertion and removal will not be critical for the correct reading of the recorded information.

Description: TICKET PROVIDED WITH A MAGNETIC LAYER, AND A CORRESPONDING APPARATUS FOR TICKET EMISSION, VALIDATION AND INSPECTION The invention relates to a ticket provided with a magnetic layer that comprises information by means of the state of magnetization of the layer, which is made on a thin carrier in the form of a stripe extending along a direction of the carrier. The invention relates also to a ticket issuing, ticket validating and ticket controlling apparatus. Tickets are conventionally used in public transport for permitting participation and as a receipt and certificate verifying that the owner of the ticket is authorized to use predetermined transport means at predetermined areas and within given time limits and in given cases under further limitations. The use of tickets extends well beyond public transport and it includes an ever increasing range of different services, e.g. as participation permits at different sports events or as entry permit to theatres, cinemas and museums, and as entry passes to hotels, etc. According to their way of use tickets can be grouped as those permitting single participation in a service and multiple use tickets allowing several use of predetermined services with certain limitations. Single tickets become invalid after single use and they can be discarded, multiple use tickets have to be retained for further use. The ticket according to the present invention covers all of the above kinds of types, however, its advantages will be apparent already in case of single tickets. State of the art uses of tickets cover a large number of aspects and requirements. The complexity and price of certain uses as well as their scope of acceptance are all determined by the extent how the requirements are satisfied. In the following the range of such requirements will be examined. For the sake of simplicity the survey will relate to tickets used in transportation, but similar requirements might be applicable to tickets used in fields different from transportation. The characteristics of tickets used in public transport include that the ticket indicates or comprises the following information. The type of the service that can be used (e.g. Public Transport Enterprise of Budapest), the description of the service itself (e.g. travel permit), limitations of the service (e.g. one hour counted from the beginning of the trip, the class of service, the passage through one or more sections or zones, the possibility of transfers, reduced rate periods e.g. weekends or off-peak travels) and finally data regarding the ticket holder or passenger (e.g. full fare ticket, children's ticket, senior or other reduced rate ticket). The passenger must buy the ticket before participation in the transport and has to validate it immediately preceding such use. The ticket must be capable of being controlled during the full time when the services are used, and in several kinds of uses the passenger can leave the area of service upon showing a valid ticket, which is then controlled. By using the information stored on single tickets there is a possibility for obtaining traffic and travel statistic information if such stored information are processed electronically by using the computing capacity of the service providers. The purchase of tickets can be connected with the use of credit cards and with the use (and control) of a number of special reduced rate policies. By using single "electronic" tickets the way opens to other complementary services, e.g. sanctioning if the use has been more extensive than permitted by the obligation of paying excess fares, or in case of a multiple zone transportation system by permitting the use in several zones within a given period. A main characteristic of the single ticket is the cost of manufacture. Such tickets may cost only a small fraction of the cost of using the service. The cost of use includes the cost of the ticket issuing, ticket validating and ticket controlling apparatus. Within the area of service a large number of such apparatus is required, although all of such apparatuses can be used at unlimited number of occasions. The cost of a given system is determined by the price of making the single tickets and those of the apparatuses used in the system. The operations connected with single tickets include the issuance of the ticket, the validation of the ticket at the beginning of the first use, in given case re- validation at a transfer, the control during the use of the services. The granting of a walk-out permit when the ticket holder wishes to leave the service area, and finally the disposal of the used ticket can also be required. The listed operations can be combined. The listed operations can be carried out only if predetermined information can be recorded on the ticket, if the ticket can be read out several times and if further information can be recorded during use (predominantly at validation). Single or multiple tickets are known that satisfy all the above listed conditions, wherein the ticket is made of cardboard (i.e. from a paper base material) and on a face of the ticket at least one stripe is provided made of a magnetic material. The recording of magnetic information takes place according to conventional magnetic recording methods. Under conventional recording methods ways are understood how information is recorded on magnetic tapes or on flexible or hard disk carriers. A common characteristic of such recording ways lies in that both at recording and reading the magnetic carrier passes in front of the air gap of a writing or reading head with a predetermined constant speed. In case of recording the magnetic field provided in the air gap closes through the magnetic material, which is magnetized in the direction of the movement. The remanent magnetic properties of the carrier store the recorded information. At reading operation the magnetic information passes in front of the air gap of the reading head and induces an electrical voltage in the coil encircling the air gap, and this voltage can be used following an appropriate amplification. This classical recording and reading method has, however, a number of drawbacks, because both the recording and reading operation requires that the carrier be moved with a uniform speed. Machine-guided movements can provide this only. There have been trials for making reading devices wherein the ticket movement occurred by the manual insertion or removal of the ticket in a ticketing machine, these solutions have not been reliable because the reading was largely dependent on the speed and on its uniformity. Among the requirements imposed on the ticket the need for recording information has already been mentioned. In case of manual ticket movement such reading cannot take place in a reliable manner. The main limitations of ticket systems used in public transport is not determined by the manufacturing cost of the ticket itself, but by the high costs of the ticketing apparatus (that includes issuance, validation and control). Such ticketing systems can be economic only at large number of users or at larger service providers with high traffic density. Typical examples for such large systems are the ticketing system used at the London Underground or at the Paris Metro. The system used at the Metro of Washington DC is more advanced than the earlier mentioned ones because it prints the remaining usable amount on the ticket that can be read by naked eye. In case of a negative amount it is permitted that fare be added before the passenger can leave the service area. The ticket issuing and validating machines must be able to read the information recorded on the magnetic carrier of the ticket and to record information thereon. A further requirement that reliable operation must be retained also in extreme whether conditions, since the machines must operate 24 hours a day at different locations of the service network area (in many cases when being under the free sky). The information that must be recorded on the ticket should be at least 64 bit long. In the actually used systems the ticketing machines comprise moving components for ensuring the required uniform speed. The need of using moving components increases price and decreases reliability. In view of the high costs the number of such sophisticated systems is rather limited, and it becomes economically justified only in case of users of substantial size and/or services being rather expensive. The object of the invention is to provide a ticket and a corresponding ticketing apparatus that provides perfect reading and recording without requiring the movement of the ticket with any predetermined and uniform speed. A further object is that the apparatus does not have to comprise moving elements, thus its cost can be substantially lower and reliability higher compared to conventional devices. The cost of making such tickets cannot be higher than the cost of generally used tickets with a magnetic stripe. In meeting the above objects it has been recognized that the dependence of the magnetically recorded information from the speed will cease to exist, if the direction of information recording will not be parallel to the plane of the carrier but normal thereto. The orientation of the information i.e. synchronization can be provided if the ticket comprises a separate synchronizing stripe. According to the invention the direction normal to the carrier involves not only the direction which closes a right angle in geometrical sense but all cross magnetized directions that can ensure recording and reading without the explained problems of speed and uniformity. According to the invention a ticket has been provided with a magnetic layer comprising information by the state of magnetization, the ticket comprises a thin carrier, and the magnetic layer is a stripe extending along a direction of the carrier. The improvement lies in that information is recorded in the magnetic layer in discrete spots thereof being magnetized normal to the plane of the layer, and the carrier comprises in addition to the information carrying stripe a distinct synchronizing stripe that extends in parallel with the magnetic layer and consists of periodically repeated sections each being associated with a respective one of said spots. In a preferable embodiment the sections of the synchronizing stripe are recognizable by means of an optical reader. In an alternative embodiment the sections of the synchronizing stripe are constituted by magnetic sections magnetized normal to the plane of the carrier. For sensing the direction of movement of the ticket the sections of the synchronizing stripe consist of two parts being slightly offset from each other in the direction of the stripe. In a preferable embodiment the stripe of the magnetic layer comprises non- magnetizable spaces between said spots. According to the invention an apparatus has also been provided for reading and/or writing magnetic information of the ticket, that comprises a recording head defining an air gap, in which the carrier with the magnetic layer is placed and capable of providing a magnetic field in the magnetic layer which is normal to the plane of the carrier, and at least one Hall detector arranged in front of the magnetic layer and reading the information recorded thereon, the Hall detector is arranged separated from the recording head, and a further sensor arranged in front of the synchronizing stripe and capable of detecting a synchronizing section when being moved in an immediately opposite position therewith. It is preferable when further sensor (comprises two detectors slightly offset from each other in the direction of ticket insertion, and a direction-sensitive counter is associated with the detectors. This further sensor is preferably an optical sensor. In a preferable embodiment the recording head, the Hall detector and the further sensor are coupled through appropriate signal processing units to an intelligent control logic. This control logic comprises a program determined by the parameters of a ticketing system serviced by the apparatus and a real time clock. The present invention renders the use of moving parts in the ticketing apparatus unnecessary and substantially decreases thereby the manufacturing cost and increases reliability. The ticket and ticketing apparatus according to the invention will now be described in connection with preferable embodiments thereof, wherein reference will be made to the accompanying drawings. In the drawing: Fig. 1 is a schematic view of prior art signal recording; Fig. 2 is an explanatory sketch for the creation of Hall effect; Fig. 3 is the general scheme of the magnetic recording according to the invention; Fig. 4 shows how optical and magnetic signals are recorded on a paper-based carrier; and Fig. 5 is the functional block diagram of the apparatus according to the inention. Fig. 1 shows a conventional signal recording on a magnetic stripe, wherein the cross-section of a magnetic layer 2 is shown on a cardboard carrier 1. For the sake of better illustration, the thickness of the magnetic layer 2 is exaggerated. A recording head 3 is arranged above the magnetic layer 2 that has a body made of magnetic material defining an air gap 4 extending in parallel with the surface of the carrier 1. The recording head 3 is magnetized by a current flowing through coil 5 generated by voltage U applied on the coil 5. The carrier 1 together with the magnetic layer 2 thereon is moved with a uniform velocity v in the direction of the arrow shown, and the movement is parallel with the plane of the carrier 1. The magnetic field is closed at the vicinity of the air gap 4 through the magnetic layer 2, magnetizing its elementary magnetic domains in the direction of the movement. The recording is digital i.e. ones and zeros are recorded in such a way that each of the recorded digits is associated with a magnetization of the magnetic layer 2 in one or the opposite direction at a predetermined length of the carrier. The letters N and S designates the north and south poles of the elementary magnets, respectively. Depending on the actual design and parameters of the recording head 3 the length of the smallest information unit can be determined, and in the knowledge of the full length of the carrier 1 the number of useful recordable information expressed in bit units can be determined. In case of a ticket of average size about 64 to 128 bits can be stored. Fig. 2 illustrates how the Hall effect takes place. If a plate 8 made of an electrically conductive material (e.g. by a semiconductor) with a thickness d is pressed between two electrodes 6, 7 both extending normal to the plane of the plate 8, and current I is passed between the electrodes 6, 7 and the plate 8 is placed in a magnetic field with an induction B, then between the faces 9, 10 of the plate 8 which extend normal to a plane defined by the direction of the flow of the current I and of the magnetic field B, a Hall voltage U H is generated, and its value can be expressed by the formula: U H = RH I B / d. The Hall voltage is static i.e. it takes place even if the elements take a fixed (static) position. The Hall effect has long been known, and it is utilized in case of a high number of electronic sensing devices, which are predominantly capable of measuring or detecting static (or slowly changing) magnetic fields. Such devices are e.g. the Hall detectors of types KSY10, KSY13 and KSY14 manufactured by Siemens AG Germany. These devices have a GaAs chip with a size of about .2 x .2 mm and it is arranged in a non-magnetic case. The device has four terminals of which two serves for the connection of the supply voltage, and the other two leads out the Hall voltage. Reference is made now to Fig. 3 showing schematically the signal recording that can be used for the present invention. The cardboard carrier 1 which represents the ticket itself, is provided with a narrow longitudinal stripe constituted by a magnetic layer 2 that takes a raster form. The ticket is inserted in the ticketing machine by a movement normal to the plane of the drawing, and its removal occurs in opposite direction. The signal recording uses a recording head 3' with a core defining a comparatively wide air gap, and the carrier 1 with the magnetic layer 2 thereon is inserted transversally in the air gap. A the rear side of the core a coil 5' is arranged, and a current +1 or -I can be passed through the coil corresponding to the value of the digital information to be recorded, and the magnetic field of this current magnetizes the air gap in transversal direction. In contrast to the arrangement of Fig. 1, the magnetic field is normal to the plane of the magnetic layer 2. The magnetization remaining after the field has been terminated will also be normal to the plane of the plate, and its sense depends on the content of the recorded information. By such an arrangement if a Hall detector is placed on the magnetic layer 2 and the sensor chip of the detector extends in parallel to the plane of the carrier 1 , a direct voltage is generated in the detector. The sense of this voltage depends on the value of the recorded information. The Hall voltage has a static character; thus its value does not depend on the speed of movement of the carrier 1 relative to the detector, as it was the case in the arrangement of Fig. 1. For decreasing the disturbing effects acting on the Hall detector used for reading, the use of a pair of Hall detector in differential circuit arrangement can be suggested. Furthermore, the reading Hall detectors should be arranged possibly far away from the recording head so that its strayed magnetic field cannot disturb the reading. The size of the tickets in longitudinal direction is sufficient for providing a suitable spacing. Reference will now be made to Fig. 4 showing an enlarged portion of the surface of the ticket. The magnetic layer 2 extends along the full length of the carrier 1 , and the layer 2 takes the form of a magnetic stripe or raster-stripe made by spreading or printing a magnetic material on the surface. In case of the known recording method explained in Fig. 1 the magnetic layer 2 has to be continuous in longitudinal direction, such a continuity is not required at the present invention, since the elementary magnetic information pieces are stored in thin spaced fields which form a raster of discrete spots. In Fig. 4 the designations S and N show the magnetic states of the upper faces of the elementary magnetized spots in case of an exemplary recorded information. If the magnetic layer 2 is not made to form a continuous stripe but from a sequence of discrete spaced spots, then the spacing between subsequent spots can be decreased compared to that required in case of a continuous stripe, because the non-magnetic spaces decrease the magnetic coupling between neighboring spots. Naturally, the invention functions equally well in case of a continuous stripe if a sufficient spacing is provided between neighboring spots. A further feature of the structure shown in Fig. 4 is the presence of a second, synchronizing stripe 12 on the surface of the carrier 1 in addition to the magnetic layer 2. In this stripe 12 at location corresponding to the respective magnetic spots respective pairs of synchronizing lines 13, 14 are provided. The lines 13 and 14 are slightly displaced in longitudinal direction. The lines in the synchronizing stripe 12 can be made by printing, and in that case the lines 13 and 14 can be observed visually, and there machine-reading can take place by respective optical readers being slightly displaced from one another At an alternative embodiment the synchronizing stripe 12 is also a magnetic stripe so that the synchronizing lines 13, 14 are predetermined fix lines made of a magnetic material, also with transversal magnetization. Their reading requires the use of further Hall readers. The synchronizing stripe 12 and the associated synchronizing lines 13 and 14 are required to make the information reading and writing operations of the information carrier magnetic layer 2 independent from the speed of insertion or removal of the ticket, and from the uniform nature of such speed. If the lines of the synchronizing stripe 12 are counted at the insertion of the ticket, and the moments are sensed when during the movement of the ticket any particular line passes a predetermined position, then the number of the magnetic spot which is just in front of the reading (or) writing head will also be known. The reason of using two offset synchronizing lines 13, 14 in association with each recording position to be able to learn the direction of movement of the ticket. If during a reading operation first the line 14 and thereafter the line 13 are sensed, then the ticket moves towards the interior of the device, thus at the next raster position the value of the position counter should be increased. If the order of detection of the lines 13 and 14 is opposite, the ticket is being removed and the counter should be decreased at each subsequent position. By using the synchronizing lines the movement of the ticket can occur at any speed and in any direction. For finishing the ticketing operation the full reading of the ticket is required i.e. the raster counter must reach the value corresponding to the highest useful recording spot. Fig. 5 shows the functional block diagram of the ticketing apparatus according to the invention. In the apparatus three active units get into contact with the ticket. The first of them is a Hall detector unit 20 that comprises sensors 21 arranged above the magnetic stripe or layer 2, amplifier 22 coupled to the output of the sensors 21 and a waveform corrector 23. The second unit is a recording unit 30 that comprises a recording head 31 made as shown in Fig. 3 and amplifier 32 for the control thereof. The third one is an optical detection unit 40 that comprises for each stripe of lines respective optical sensors 41, amplifiers 42 and waveform correctors 43 coupled to one another. All of these three units are connected to an intelligent control logic 50 that knows the information that can and should be contained in the ticket and comprises the earlier referred counter and a logic recognizing the direction of ticket movement, and the logic 50 is capable of evaluating the authentic nature of the ticket and it is coupled preferably to a local display 60 and, if required, through an interface 70 to a central processing unit. The control logic 50 comprises additionally a real time clock providing time signals for determining the time limitations of the ticket. A power supply 80 is used to provide the required stabilized voltages for the units in the apparatus. According to the invention the magnetic information recorded on the ticket has been modified in a substantial way compared to conventional recording technique, since neither the writing nor the reading depends on the speed of ticket insertion or removal, furthermore the direction of magnetization is normal to the plane of the ticket enabling the use of Halls sensors. The monitoring of the momentary position of the ticket by means of the synchronizing stripe renders the use of automated ticket movement unnecessary, and such moving devices were the most expensive and less reliable components of conventional ticketing machines, which can now be spared. Thereby the price of such machines becomes much lower and their reliability much higher. The lower price and smaller dimensions substantially enhance the field of application for intelligent tickets, and the system with all its enhanced features will be available for smaller users and service providers. The present invention cannot be limited to the use of tickets in the narrow meaning of the term, because when seen from the point of view of the present invention, the reading and recording of the magnetic information of credit or debit cards takes place in a similar way as in case of tickets. From the aspect of the invention it has only significance that the reading of the magnetic stripe recorded on the card does not require the use of a separate moving device, and the reliability of manual movement will improve by means of the synchronization as described above.

Claims: Claims: 1. A ticket provided with a magnetic layer comprising information by the state of magnetization, said ticket comprising a thin carrier and said magnetic layer being constituted by a stripe extending along a direction of said carrier, characterized in that said information is recorded in said magnetic layer (2) in discrete spots thereof being magnetized normal to the plane of the layer, and said carrier (1) comprising in addition to said information carrying stripe a distinct synchronizing stripe (12) extending in parallel with said magnetic layer (2) and consisting of periodically repeated sections each being associated with respective one of said spots. 2. The ticket as claimed in claim 1, characterized in that said sections of said synchronizing stripe being recognizable by means of an optical reader (41). 3. The ticket as claimed in claim 1, characterized in that said sections of the synchronizing stripe (12) being constituted by magnetic sections magnetized normal to the plane of said carrier (1). 4. The ticket as claimed in claim 1, characterized in that said sections of the synchronizing stripe (12) consist of two parts being slightly offset from each other in the direction of the stripe. 5. The ticket as claimed in claim 1, characterized in that said stripe of the magnetic layer (2) comprises non-magnetizable spaces between said spots. 6. Apparatus for reading and/or writing magnetic information of the ticket according to any of the claims 1 to 5, characterized by comprising a recording head (31) defining an air gap in which said carrier (1) with the magnetic layer (2) is placed and capable of providing a magnetic field in said magnetic layer (2) normal to the plane of the carrier (1), and at least one Hall detector (21) arranged in front of said magnetic layer (2) and reading the information recorded thereon, said Hall detector (21) is arranged in front of said synchronizing stripe (12) and capable of detecting a synchronizing section when being moved in an immediately opposite position therewith. 7. The apparatus as claimed in claim 6, characterized by said further sensor (41) comprising two detectors slightly offset from each other in the direction of ticket insertion, and a direction-sensitive counter associated with said detectors. 8. The apparatus as claimed in claim 6, characterized in that said further sensor (41) being an optical sensor. 9. The apparatus as claimed in claim 6, characterized in that said recording head (31), said Hall detector (21) and said further sensor (41) being coupled through appropriate signal processing units to an intelligent control logic (50) comprising a program determined by the parameters of a ticketing system serviced by said apparatus and comprising a real time clock.

Inventors: GAJDAR TIBOR, RACZ GABOR, SUOMELIDIS ALEXANDROS, GAJDAR, TIBOR, RACZ, GABOR, SUOMELIDIS, ALEXANDROS
Applicants: GAJDAR TIBOR, RACZ GABOR, SUOMELIDIS ALEXANDROS, GAJDAR, TIBOR, RACZ, GABOR, SUOMELIDIS, ALEXANDROS
Application year: 2001
Main classification: G06K19
IPC codes: G06K19