CA2289319C - Magnetic code reading device and magnetic code reading method - Google Patents
Magnetic code reading device and magnetic code reading method Download PDFInfo
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- CA2289319C CA2289319C CA002289319A CA2289319A CA2289319C CA 2289319 C CA2289319 C CA 2289319C CA 002289319 A CA002289319 A CA 002289319A CA 2289319 A CA2289319 A CA 2289319A CA 2289319 C CA2289319 C CA 2289319C
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- jitter
- magnetic code
- recording medium
- timing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/08—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes
- G06K7/082—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors
- G06K7/083—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors inductive
- G06K7/084—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors inductive sensing magnetic material by relative movement detecting flux changes without altering its magnetised state
Abstract
A magnetic code reading device and magnetic code reading method in an ATM or the like which after detecting a readout magnetic waveform including jitter, performs necessary transaction processing without performing uniform error processing in a predetermined case. The device comprises a magnetic head having a magnetic sensor for writing and reading magnetic code onto/from a magnetic recording medium, a timing disk for generating a timing pulse in correspondence with a moving distance of the magnetic head, and a controller for controlling the magnetic head and the timing disk, wherein upon reading of magnetic code on the magnetic recording medium where predetermined information is written in correspondence with the timing pulse, if jitter appears at relatively fixed intervals, corresponding to a rotational period of the timing disk, in a series of readout magnetic waveforms detected by the magnetic sensor, the controller recognizes the magnetic code based on the series of readout magnetic waveforms including the jitter, while if jitter is not related to the rotational period of the timing disk, the controller performs reading error processing.
Description
MAGNETIC CODE READING DEVICE AND MAGNETIC CODE READING METHOD
Background of the Invention Field of the Invention The present invention relates to a magnetic code reading device and a magnetic code reading method for a magnetic recording medium such as a bankbook issued by a bank or the like or a credit card, and more particularly, to a device for reading magnetic code on a magnetic recording medium where predetermined information is written in correspondence with a timing pulse generated in correspondence with a moving distance of a magnetic head.
Description of Related Art A bankbook of a bank or the like has a stripe-shaped magnetic recording medium for recording magnetic code, encoding the name of bank branch that issued the bankbook, an account number and the like, attached thereto. Further, in a magnetic card such as a credit card, a similar magnetic recording medium for recording magnetic code relating to a card number and the like is provided.
The bankbook or magnetic card is inserted into a bankbook slot or card slot in an automatic teller machine (hereinafter abbreviated to "ATM") or the like, then magnetic code recorded on the magnetic recording medium is read, and predetermined information is recognized.
' CA 02289319 1999-11-10 As a method for recording magnetic code onto a magnetic recording medium, a digital recording method is employed, and various modulation methods are employed for modulating binary data in correspondence with existence/absence of magnetization, direction of magnetization or the like.
Typical modulation methods are an NRZI (Non Return to Zero Inverted) method, an FM (Frequency Modulation) method, an MFM
(Modified FM) method, (2, 7), (1, 7) coding methods and the like.
Among these modulation methods, the FM method and the coding methods enable self clocking by adding a clock signal to each bit indicative of writing code. In the FM method, for example, in a magnetic head transfer mechanism to move a magnetic head having a magnetic sensor on a surface of the stripe-shaped magnetic recording medium, a timing disk for generating a timing pulse in accordance with a moving distance of the magnetic head is provided, and the timing pulse is used as a clock signal, such that predetermined magnetic code is written onto the magnetic recording medium in synchronization with the rising edge (or falling edge) of the timing pulse.
The magnetic code written in this manner is detected by the magnetic sensor on the magnetic head moving at an almost constant speed on the surface of the magnetic recording medium by the magnetic head transfer mechanism. Then, a serial digital signal relating to the written predetermined . ' CA 02289319 1999-11-10 information is reproduced based on a series of detected readout magnetic waveforms.
In a magnetic head transfer mechanism as shown in Fig.
1, the timing disk, for generating the above-described timing pulse used in writing magnetic code, has a disk shape to rotate in accordance with rotation of a lead screw to move the magnetic head. The disk has a plurality of slits at fixed intervals on its periphery. An optical detection sensor, comprising a pair of light emitting device and photoreception device, is attached to a frame of the magnetic head transfer mechanism such that the devices hold the periphery of the disk therebetween. In this manner, one timing pulse is generated by a unit moving distance of the magnetic head.
However, the ATM or the like is not always installed in a position in an excellent air environment. Further, as the ATM or the like contains a printer for printing the statement of each transaction such as obtaining cash on a rolled paper and cutting the printed paper, paper dust occurs within the cabinet.
The small particles and dust such as paper dust occasionally enter the slits of the timing disk, and prevent the optical detection sensor from precisely detecting the respective slits of the timing disk rotating with the movement of the magnetic head. Accordingly, the above-described timing pulse waveform used in writing magnetic code cannot be generated by the unit moving distance of the magnetic head, and a magnetic waveform written in this state includes a fitter waveform.
In a case where a written magnetic waveform including thus-occurred fitter is read, the waveform representing a binary bit is different from that representing a binary bit indicative of regular "1" or "0", and a "high" or "low" part extended for the timing clock unit period is detected.
In this case, a magnetic code reading device in a conventional ATM or the like determines that a writing error has occurred and performs uniform error processing. The device determines that the bankbook or magnetic card cannot be recognized and ejects it without performing necessary transaction processing.
By this operation, it is determined that the magnetic data must be written onto the bankbook or magnetic card again, and the bankbook or magnetic card cannot be used for such operation. Also, it is determined that correction must be performed on the ATM or the like, and it cannot be used.
Brief Summary of the Invention The present invention has been made in view of the fact that even though a readout magnetic waveform includes fitter, there is no problem in magnetic code reading and recognition processing in a predetermined case, and provides a magnetic ' CA 02289319 1999-11-10 code reading device comprising a magnetic head having a magnetic sensor for writing and reading magnetic code onto/from a magnetic recording medium, a timing disk for generating a timing pulse in correspondence with a moving 5 distance of said magnetic head, and a controller for controlling said magnetic head and said timing pulse, wherein upon reading of magnetic code on the magnetic recording medium where predetermined information is written in correspondence with said timing pulse, if fitter appears at fixed intervals, corresponding to a rotational period of said timing disk, in a series of readout magnetic waveforms detected by said magnetic sensor, said controller recognizes said magnetic code based on said series of readout magnetic waveforms including the fitter, while if fitter not related to the rotational period of said timing disk appears, said controller performs reading error processing.
The controller has a storage buffer for temporarily storing a serial digital signal detected based on said series of readout magnetic waveforms detected by said magnetic sensor, and the controller detects the existence or absence of fitter repeated at relatively fixed intervals corresponding to the rotational period of said timing disk, in the serial digital signal.
Further, the present invention provides a method for reading magnetic code on a magnetic recording medium where predetermined information is written in correspondence with a timing pulse generated by a unit moving distance of a magnetic head having a magnetic sensor, comprising: a step of outputting a serial digital signal based on a series of readout magnetic waveforms detected by said magnetic sensor; a step of temporarily storing said serial digital signal into a storage buffer; a step of detecting existence or absence of fitter repeated at fixed intervals corresponding to a rotational period of a timing disk for generating said timing pulse, in said serial digital signal; and a step of, if said fitter appears repeated at relatively fixed intervals, correcting said fitter based on said serial digital signal including said fitter and recognizing said magnetic code, while if fitter appears asynchronous to the rotational period of said timing disk, performing reading error processing.
Brief Description of Drawings Fig. 1 is a diagram showing the mechanism in the magnetic code reading device.
Figs. 2A and 2B are diagrams showing examples of "normal waveform" and "fitter waveform" when magnetic code is written in synchronization with the timing clock signal.
Fig. 3 is a diagram showing an example of the series of binary data relating to readout signals stored in the storage buffer.
' CA 02289319 1999-11-10 Fig. 4 is a flowchart showing an example of control flow in the magnetic code reading method according to the present invention.
Fig. 5 is a flowchart showing an example of control flow in the magnetic code reading method according to the present invention.
Detailed Description Hereinbelow, the details of magnetic code reading device and reading method according to the present invention will be described with reference to the drawings.
Fig. 1 shows an example of a mechanism in a magnetic code reading device used in the magnetic code reading device according to the present invention.
A bankbook 11, inserted into a bankbook slot of an ATM
or the like, is transferred to a predetermined magnetic reading position for recognition of the bankbook 11 itself by internal transfer means (not shown). Generally, a stripe-shaped magnetic recording medium 12 for recording magnetic code encoding information indicative of the name of a bank branch issued the bankbook, an account number and the like, is attached to the rear side of the bankbook 11. The ATM or the like recognizes the bankbook 11 by writing necessary information onto the magnetic recording medium 12 and reading the written magnetic code later.
i As shown in Fig. 1, in the magnetic code reading device such as the ATM, a magnetic head 2 having a magnetic sensor 1 writes and reads predetermined magnetic code while moving along the stripe-shaped magnetic recording medium 12 of the bankbook 11.
A DC motor capable of forward and reverse rotations is used as a motor 3. A transmission belt 4 for transmitting a rotational driving force is held on the rotation shaft of the motor 3. The transmission belt 4 transmits the rotational driving force of the motor 3 to a pulley 5. The pulley 5 is fixed to one end of a rotational shaft of a lead screw 7. The lead screw 7 has a helical groove as a male screw on its surface. The magnetic head has a helical groove as a female screw engaging with the lead screw 7. V~hen the motor 3 rotates forward, for example, the magnetic head 2 horizontally moves rightward, and when the motor 3 rotates reversely, the magnetic head 2 horizontally moves leftward. Further, the magnetic head 2 slides on a guide shaft 6 to stabilize its running.
A timing disk 8 is attached to the other end of the rotational shaft of the lead screw 7. The timing disk 8 has slits at fixed intervals in its periphery, and an optical sensor 9 is provided in a chassis 10 in a position to hold the periphery of the disk.
' CA 02289319 1999-11-10 The optical sensor 9 comprises a light emitting device and a photoreception device. As light is transmitted through the portion of the slit of the timing disk 8 but is blocked at a portion where the slit is not formed, the optical sensor 9 outputs a timing pulse signal in correspondence with rotation of the timing disk 8 rotating with the lead screw.
Control means (not shown) detects the position of the magnetic sensor 1 based on the timing pulse outputted from the optical sensor 9, and writes predetermined magnetic code onto the magnetic recording medium 12 of the bankbook 11, using the timing pulse as a timing clock signal, in synchronization with the timing clock signal.
Figs. 2A and 2B respectively show examples of "normal waveform" and "fitter waveform" when magnetic code is written in synchronization with the timing clock signal.
Fig. 2A shows a case of normal waveform. As described above, the timing clock signal is generated in accordance with the rotation of the timing disk 8 synchronized with the movement of the magnetic sensor 1. When predetermined magnetic code is written onto the magnetic recording medium 12 of the bankbook 11, in synchronization with the rising edge of the timing clock signal, the writing waveform of data "1" is as shown in Fig. 2A(a), and that of data "0" is as shown in Fig. 2A(b).
i However, as shown in Fig. 2B, if a foreign particle is attached to the slit of the timing disk 8 and the slit blocks light from the light emitting device of the optical sensor 9, the "low" period of the timing clock signal is lengthened 5 because the slit cannot be detected. In this status, if data "1" is written, the writing waveform of the data is as shown in Fig. 2B(a), and if data "0" is written, the writing waveform of the data is as shown in Fig. 2B(b). Accordingly, in this case, the waveforms in Fig. 2B(a) and Fig. 2B(b) are 10 respectively 50~ fitter waveforms with respect to the normal writing waveforms in Fig. 2A(a) and Fig. 2A(b).
The bankbook, in which the writing data including the fitter occurred as described above is written onto the magnetic recording medium 12, is read later. By movement control on the magnetic head by a mechanism similar to that described above (Fig. 1), the magnetic sensor 1 generates a series of analog electric signals by changes in magnetic amount (magnetic flux) recorded on the magnetic recording medium, while running on the magnetic recording medium at a predetermined speed.
Note that in the present embodiment, the magnetic code writing density in the magnetic recording medium 12 is 210 bits/inch, and the timing disk 8 has 82 slits. For example, if it is arranged such that data writing onto the magnetic recording medium is completed by rotations of the timing disk ' CA 02289319 1999-11-10 8 six times, as 1 bit data is written for 2 pulses of the timing clock as shown in Figs. 2A and 2B, about 246 bit data can be written onto the magnetic recording medium 12.
Assuming that one character is represented by 4 bits, information of 60 or more characters can be written onto the magnetic recording medium 12.
A controller in the magnetic code reading device obtains a series of binary data by decoding the analog electric signals sensed by the magnetic sensor 1, and stores the data into a storage buffer for temporary storage.
Fig. 3 shows an example of the series of binary data stored in the storage buffer.
In the magnetic code reading method according to the present invention, the controller obtains such serial data by decoding the analog electric signals sensed by the magnetic sensor 1, and at the same time, stores the positions of occurrence of fitter waveform. Further, when binary decoding conversion on all the data has been completed, the controller calculates an average value of intervals of occurrence in the stored positions of occurrence of fitter waveform. Then, in consideration of a predetermined allowable range from the calculated average value of intervals of occurrence of fitter waveform, the controller determines whether or not all the fitter waveforms appear at intervals synchronized with the rotational period of the timing disk 8. If the controller ' CA 02289319 1999-11-10 determines that all the fitter waves appear at intervals synchronized with the rotational period of the timing disk 8, the controller performs reading processing, while if the controller determines that the fitter waves do not appear at intervals synchronized with the rotational period of the timing disk 8, the controller performs error processing to avoid the risk of misreading.
According to the example of Fig. 3, in a case where the positions of occurrence of the 50~ fitter correspond to 8th bit, 19th bit, 30th bit, filth bit, 52th bit and 64th bit of the serial binary signal stored in the storage buffer, the average value of all the fitter intervals is calculated as {(19-8)+(30-19)+(41-30)+(52-41)+(64-52)} ~ 5 = 11.2 bits.
Assuming that the allowable range is (+1/-1) bits, as 10 <
11.2 bits < 12 holds, it can be regarded that the fitter occurred due to a foreign particle or the like attached to the slit of the timing disk 8. Then reading processing is performed. If the condition is not satisfied, to avoid the risk of misreading, reading error processing is performed.
Figs. 4 and 5 show control flowcharts of the above-described magnetic code reading method according to the present invention.
When the magnetic sensor 1 has completed reading of the magnetic recording medium 12 in step 21, the controller determines binary "0" or "1" based on the read waveforms of the analog signals (decoding processing), and sequentially writes the series of binary data into the storage buffer in step 22. In the waveforms representing the respective binary data, if fitter (e. g., 50~ fitter) is detected, the detection position of the fitter (bit position) is sequentially stored into a fitter storage buffer in the controller in step 24. If no fitter has been detected, reading processing is performed in step 28. then the detection positions of all the jitters have been stored into the fitter storage buffer in step 26, the average value of intervals of occurrence in the stored positions of occurrence of the fitter waveforms is calculated in step 30. Then, the predetermined allowable range is set from the calculated average value of intervals of occurrence of fitter waveforms in step 31. Then, all the fitter intervals are calculated by the method described in step 33.
It is determined whether or not each fitter interval is within the allowable range in step 34. The determination is continued until the comparison for all the fitter intervals is completed in step 32.
If all the fitter intervals are within the allowable range, the reading processing is performed in step 27, while if the intervals are outside the allowable range, the reading error processing in step 35 is performed, and the magnetic reading routine ends in step 36.
i As described above, in the magnetic code reading device according to the present invention, in a serial digital signal, detected based on the series of readout magnetic waveforms detected by the magnetic sensor, if fitter repeated at fixed intervals corresponding to the rotational period of the timing disk is detected, magnetic code reading and recognition processing is performed, and necessary transaction processing can be performed without determining that the bankbook or magnetic card cannot be recognized and performing error processing.
Background of the Invention Field of the Invention The present invention relates to a magnetic code reading device and a magnetic code reading method for a magnetic recording medium such as a bankbook issued by a bank or the like or a credit card, and more particularly, to a device for reading magnetic code on a magnetic recording medium where predetermined information is written in correspondence with a timing pulse generated in correspondence with a moving distance of a magnetic head.
Description of Related Art A bankbook of a bank or the like has a stripe-shaped magnetic recording medium for recording magnetic code, encoding the name of bank branch that issued the bankbook, an account number and the like, attached thereto. Further, in a magnetic card such as a credit card, a similar magnetic recording medium for recording magnetic code relating to a card number and the like is provided.
The bankbook or magnetic card is inserted into a bankbook slot or card slot in an automatic teller machine (hereinafter abbreviated to "ATM") or the like, then magnetic code recorded on the magnetic recording medium is read, and predetermined information is recognized.
' CA 02289319 1999-11-10 As a method for recording magnetic code onto a magnetic recording medium, a digital recording method is employed, and various modulation methods are employed for modulating binary data in correspondence with existence/absence of magnetization, direction of magnetization or the like.
Typical modulation methods are an NRZI (Non Return to Zero Inverted) method, an FM (Frequency Modulation) method, an MFM
(Modified FM) method, (2, 7), (1, 7) coding methods and the like.
Among these modulation methods, the FM method and the coding methods enable self clocking by adding a clock signal to each bit indicative of writing code. In the FM method, for example, in a magnetic head transfer mechanism to move a magnetic head having a magnetic sensor on a surface of the stripe-shaped magnetic recording medium, a timing disk for generating a timing pulse in accordance with a moving distance of the magnetic head is provided, and the timing pulse is used as a clock signal, such that predetermined magnetic code is written onto the magnetic recording medium in synchronization with the rising edge (or falling edge) of the timing pulse.
The magnetic code written in this manner is detected by the magnetic sensor on the magnetic head moving at an almost constant speed on the surface of the magnetic recording medium by the magnetic head transfer mechanism. Then, a serial digital signal relating to the written predetermined . ' CA 02289319 1999-11-10 information is reproduced based on a series of detected readout magnetic waveforms.
In a magnetic head transfer mechanism as shown in Fig.
1, the timing disk, for generating the above-described timing pulse used in writing magnetic code, has a disk shape to rotate in accordance with rotation of a lead screw to move the magnetic head. The disk has a plurality of slits at fixed intervals on its periphery. An optical detection sensor, comprising a pair of light emitting device and photoreception device, is attached to a frame of the magnetic head transfer mechanism such that the devices hold the periphery of the disk therebetween. In this manner, one timing pulse is generated by a unit moving distance of the magnetic head.
However, the ATM or the like is not always installed in a position in an excellent air environment. Further, as the ATM or the like contains a printer for printing the statement of each transaction such as obtaining cash on a rolled paper and cutting the printed paper, paper dust occurs within the cabinet.
The small particles and dust such as paper dust occasionally enter the slits of the timing disk, and prevent the optical detection sensor from precisely detecting the respective slits of the timing disk rotating with the movement of the magnetic head. Accordingly, the above-described timing pulse waveform used in writing magnetic code cannot be generated by the unit moving distance of the magnetic head, and a magnetic waveform written in this state includes a fitter waveform.
In a case where a written magnetic waveform including thus-occurred fitter is read, the waveform representing a binary bit is different from that representing a binary bit indicative of regular "1" or "0", and a "high" or "low" part extended for the timing clock unit period is detected.
In this case, a magnetic code reading device in a conventional ATM or the like determines that a writing error has occurred and performs uniform error processing. The device determines that the bankbook or magnetic card cannot be recognized and ejects it without performing necessary transaction processing.
By this operation, it is determined that the magnetic data must be written onto the bankbook or magnetic card again, and the bankbook or magnetic card cannot be used for such operation. Also, it is determined that correction must be performed on the ATM or the like, and it cannot be used.
Brief Summary of the Invention The present invention has been made in view of the fact that even though a readout magnetic waveform includes fitter, there is no problem in magnetic code reading and recognition processing in a predetermined case, and provides a magnetic ' CA 02289319 1999-11-10 code reading device comprising a magnetic head having a magnetic sensor for writing and reading magnetic code onto/from a magnetic recording medium, a timing disk for generating a timing pulse in correspondence with a moving 5 distance of said magnetic head, and a controller for controlling said magnetic head and said timing pulse, wherein upon reading of magnetic code on the magnetic recording medium where predetermined information is written in correspondence with said timing pulse, if fitter appears at fixed intervals, corresponding to a rotational period of said timing disk, in a series of readout magnetic waveforms detected by said magnetic sensor, said controller recognizes said magnetic code based on said series of readout magnetic waveforms including the fitter, while if fitter not related to the rotational period of said timing disk appears, said controller performs reading error processing.
The controller has a storage buffer for temporarily storing a serial digital signal detected based on said series of readout magnetic waveforms detected by said magnetic sensor, and the controller detects the existence or absence of fitter repeated at relatively fixed intervals corresponding to the rotational period of said timing disk, in the serial digital signal.
Further, the present invention provides a method for reading magnetic code on a magnetic recording medium where predetermined information is written in correspondence with a timing pulse generated by a unit moving distance of a magnetic head having a magnetic sensor, comprising: a step of outputting a serial digital signal based on a series of readout magnetic waveforms detected by said magnetic sensor; a step of temporarily storing said serial digital signal into a storage buffer; a step of detecting existence or absence of fitter repeated at fixed intervals corresponding to a rotational period of a timing disk for generating said timing pulse, in said serial digital signal; and a step of, if said fitter appears repeated at relatively fixed intervals, correcting said fitter based on said serial digital signal including said fitter and recognizing said magnetic code, while if fitter appears asynchronous to the rotational period of said timing disk, performing reading error processing.
Brief Description of Drawings Fig. 1 is a diagram showing the mechanism in the magnetic code reading device.
Figs. 2A and 2B are diagrams showing examples of "normal waveform" and "fitter waveform" when magnetic code is written in synchronization with the timing clock signal.
Fig. 3 is a diagram showing an example of the series of binary data relating to readout signals stored in the storage buffer.
' CA 02289319 1999-11-10 Fig. 4 is a flowchart showing an example of control flow in the magnetic code reading method according to the present invention.
Fig. 5 is a flowchart showing an example of control flow in the magnetic code reading method according to the present invention.
Detailed Description Hereinbelow, the details of magnetic code reading device and reading method according to the present invention will be described with reference to the drawings.
Fig. 1 shows an example of a mechanism in a magnetic code reading device used in the magnetic code reading device according to the present invention.
A bankbook 11, inserted into a bankbook slot of an ATM
or the like, is transferred to a predetermined magnetic reading position for recognition of the bankbook 11 itself by internal transfer means (not shown). Generally, a stripe-shaped magnetic recording medium 12 for recording magnetic code encoding information indicative of the name of a bank branch issued the bankbook, an account number and the like, is attached to the rear side of the bankbook 11. The ATM or the like recognizes the bankbook 11 by writing necessary information onto the magnetic recording medium 12 and reading the written magnetic code later.
i As shown in Fig. 1, in the magnetic code reading device such as the ATM, a magnetic head 2 having a magnetic sensor 1 writes and reads predetermined magnetic code while moving along the stripe-shaped magnetic recording medium 12 of the bankbook 11.
A DC motor capable of forward and reverse rotations is used as a motor 3. A transmission belt 4 for transmitting a rotational driving force is held on the rotation shaft of the motor 3. The transmission belt 4 transmits the rotational driving force of the motor 3 to a pulley 5. The pulley 5 is fixed to one end of a rotational shaft of a lead screw 7. The lead screw 7 has a helical groove as a male screw on its surface. The magnetic head has a helical groove as a female screw engaging with the lead screw 7. V~hen the motor 3 rotates forward, for example, the magnetic head 2 horizontally moves rightward, and when the motor 3 rotates reversely, the magnetic head 2 horizontally moves leftward. Further, the magnetic head 2 slides on a guide shaft 6 to stabilize its running.
A timing disk 8 is attached to the other end of the rotational shaft of the lead screw 7. The timing disk 8 has slits at fixed intervals in its periphery, and an optical sensor 9 is provided in a chassis 10 in a position to hold the periphery of the disk.
' CA 02289319 1999-11-10 The optical sensor 9 comprises a light emitting device and a photoreception device. As light is transmitted through the portion of the slit of the timing disk 8 but is blocked at a portion where the slit is not formed, the optical sensor 9 outputs a timing pulse signal in correspondence with rotation of the timing disk 8 rotating with the lead screw.
Control means (not shown) detects the position of the magnetic sensor 1 based on the timing pulse outputted from the optical sensor 9, and writes predetermined magnetic code onto the magnetic recording medium 12 of the bankbook 11, using the timing pulse as a timing clock signal, in synchronization with the timing clock signal.
Figs. 2A and 2B respectively show examples of "normal waveform" and "fitter waveform" when magnetic code is written in synchronization with the timing clock signal.
Fig. 2A shows a case of normal waveform. As described above, the timing clock signal is generated in accordance with the rotation of the timing disk 8 synchronized with the movement of the magnetic sensor 1. When predetermined magnetic code is written onto the magnetic recording medium 12 of the bankbook 11, in synchronization with the rising edge of the timing clock signal, the writing waveform of data "1" is as shown in Fig. 2A(a), and that of data "0" is as shown in Fig. 2A(b).
i However, as shown in Fig. 2B, if a foreign particle is attached to the slit of the timing disk 8 and the slit blocks light from the light emitting device of the optical sensor 9, the "low" period of the timing clock signal is lengthened 5 because the slit cannot be detected. In this status, if data "1" is written, the writing waveform of the data is as shown in Fig. 2B(a), and if data "0" is written, the writing waveform of the data is as shown in Fig. 2B(b). Accordingly, in this case, the waveforms in Fig. 2B(a) and Fig. 2B(b) are 10 respectively 50~ fitter waveforms with respect to the normal writing waveforms in Fig. 2A(a) and Fig. 2A(b).
The bankbook, in which the writing data including the fitter occurred as described above is written onto the magnetic recording medium 12, is read later. By movement control on the magnetic head by a mechanism similar to that described above (Fig. 1), the magnetic sensor 1 generates a series of analog electric signals by changes in magnetic amount (magnetic flux) recorded on the magnetic recording medium, while running on the magnetic recording medium at a predetermined speed.
Note that in the present embodiment, the magnetic code writing density in the magnetic recording medium 12 is 210 bits/inch, and the timing disk 8 has 82 slits. For example, if it is arranged such that data writing onto the magnetic recording medium is completed by rotations of the timing disk ' CA 02289319 1999-11-10 8 six times, as 1 bit data is written for 2 pulses of the timing clock as shown in Figs. 2A and 2B, about 246 bit data can be written onto the magnetic recording medium 12.
Assuming that one character is represented by 4 bits, information of 60 or more characters can be written onto the magnetic recording medium 12.
A controller in the magnetic code reading device obtains a series of binary data by decoding the analog electric signals sensed by the magnetic sensor 1, and stores the data into a storage buffer for temporary storage.
Fig. 3 shows an example of the series of binary data stored in the storage buffer.
In the magnetic code reading method according to the present invention, the controller obtains such serial data by decoding the analog electric signals sensed by the magnetic sensor 1, and at the same time, stores the positions of occurrence of fitter waveform. Further, when binary decoding conversion on all the data has been completed, the controller calculates an average value of intervals of occurrence in the stored positions of occurrence of fitter waveform. Then, in consideration of a predetermined allowable range from the calculated average value of intervals of occurrence of fitter waveform, the controller determines whether or not all the fitter waveforms appear at intervals synchronized with the rotational period of the timing disk 8. If the controller ' CA 02289319 1999-11-10 determines that all the fitter waves appear at intervals synchronized with the rotational period of the timing disk 8, the controller performs reading processing, while if the controller determines that the fitter waves do not appear at intervals synchronized with the rotational period of the timing disk 8, the controller performs error processing to avoid the risk of misreading.
According to the example of Fig. 3, in a case where the positions of occurrence of the 50~ fitter correspond to 8th bit, 19th bit, 30th bit, filth bit, 52th bit and 64th bit of the serial binary signal stored in the storage buffer, the average value of all the fitter intervals is calculated as {(19-8)+(30-19)+(41-30)+(52-41)+(64-52)} ~ 5 = 11.2 bits.
Assuming that the allowable range is (+1/-1) bits, as 10 <
11.2 bits < 12 holds, it can be regarded that the fitter occurred due to a foreign particle or the like attached to the slit of the timing disk 8. Then reading processing is performed. If the condition is not satisfied, to avoid the risk of misreading, reading error processing is performed.
Figs. 4 and 5 show control flowcharts of the above-described magnetic code reading method according to the present invention.
When the magnetic sensor 1 has completed reading of the magnetic recording medium 12 in step 21, the controller determines binary "0" or "1" based on the read waveforms of the analog signals (decoding processing), and sequentially writes the series of binary data into the storage buffer in step 22. In the waveforms representing the respective binary data, if fitter (e. g., 50~ fitter) is detected, the detection position of the fitter (bit position) is sequentially stored into a fitter storage buffer in the controller in step 24. If no fitter has been detected, reading processing is performed in step 28. then the detection positions of all the jitters have been stored into the fitter storage buffer in step 26, the average value of intervals of occurrence in the stored positions of occurrence of the fitter waveforms is calculated in step 30. Then, the predetermined allowable range is set from the calculated average value of intervals of occurrence of fitter waveforms in step 31. Then, all the fitter intervals are calculated by the method described in step 33.
It is determined whether or not each fitter interval is within the allowable range in step 34. The determination is continued until the comparison for all the fitter intervals is completed in step 32.
If all the fitter intervals are within the allowable range, the reading processing is performed in step 27, while if the intervals are outside the allowable range, the reading error processing in step 35 is performed, and the magnetic reading routine ends in step 36.
i As described above, in the magnetic code reading device according to the present invention, in a serial digital signal, detected based on the series of readout magnetic waveforms detected by the magnetic sensor, if fitter repeated at fixed intervals corresponding to the rotational period of the timing disk is detected, magnetic code reading and recognition processing is performed, and necessary transaction processing can be performed without determining that the bankbook or magnetic card cannot be recognized and performing error processing.
Claims (8)
1. A magnetic code reading device comprising a magnetic head having a magnetic sensor for writing magnetic code onto and reading magnetic code from a magnetic recording medium, a timing disk for generating a timing pulse in correspondence with a moving distance of said magnetic head, and a controller for controlling said magnetic head and said timing disk, wherein said controller determines, based on magnetic code including predetermined information recorded in correspondence with the timing pulse and read from the magnetic recording medium, if jitter appears in a series of readout magnetic waveforms detected by said magnetic sensor, and, wherein if jitter appears at relatively fixed intervals corresponding to a rotational period of said timing disk, said controller recognizes said magnetic code and if jitter does not appear at relatively fixed intervals corresponding to the rotational period of said timing disk, said controller performs reading error processing.
2. The magnetic code reading device according to claim 1, wherein said controller has a storage buffer for temporarily storing a serial digital signal based on said series of readout magnetic waveforms detected by said magnetic sensor and said controller detects existence of jitter repeated at relatively fixed intervals corresponding to the rotational period of said timing disk using said serial digital signal.
3. The magnetic code reading device according to claim 2, wherein said readout magnetic waveforms contain 50%
or 100% of jitter with respect to normal waveforms.
or 100% of jitter with respect to normal waveforms.
4. The magnetic code reading device according to claim 2, wherein a modulation method for writing magnetic code onto said magnetic recording medium is FM modulation.
5. The magnetic code reading device according to claim 1, wherein said magnetic recording medium is a magnetic stripe recording medium provided on a bankbook.
6. A method for reading magnetic code on a magnetic recording medium where predetermined information is written in correspondence with a timing pulse generated by a unit moving distance of a magnetic head having a magnetic sensor, comprising:
outputting a serial digital signal based on a series of readout magnetic waveforms detected by the magnetic sensor;
storing said serial digital signal in a storage buffer;
detecting the existence or absence of jitter repeated at relatively fixed intervals corresponding to a rotational period of a timing disk for generating the timing pulse, in the serial digital signal;
if jitter is detected as being repeated at relatively fixed intervals, correcting the jitter based on the serial digital signal including the jitter and recognizing the magnetic code; and if jitter is detected as being asynchronous to the rotational period of said timing disk, performing reading error processing.
outputting a serial digital signal based on a series of readout magnetic waveforms detected by the magnetic sensor;
storing said serial digital signal in a storage buffer;
detecting the existence or absence of jitter repeated at relatively fixed intervals corresponding to a rotational period of a timing disk for generating the timing pulse, in the serial digital signal;
if jitter is detected as being repeated at relatively fixed intervals, correcting the jitter based on the serial digital signal including the jitter and recognizing the magnetic code; and if jitter is detected as being asynchronous to the rotational period of said timing disk, performing reading error processing.
7. The magnetic code reading method according to claim 6, wherein said readout magnetic waveforms contain 50%
or 100 of the fitter with respect to normal waveforms.
or 100 of the fitter with respect to normal waveforms.
8. The magnetic code reading method according to claim 6, wherein a modulation method for writing magnetic code onto the magnetic recording medium is FM modulation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP323124/98 | 1998-11-13 | ||
| JP32312498A JP4210372B2 (en) | 1998-11-13 | 1998-11-13 | Magnetic code reader and magnetic code reading method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2289319A1 CA2289319A1 (en) | 2000-05-13 |
| CA2289319C true CA2289319C (en) | 2002-12-31 |
Family
ID=18151362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002289319A Expired - Fee Related CA2289319C (en) | 1998-11-13 | 1999-11-10 | Magnetic code reading device and magnetic code reading method |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6561419B1 (en) |
| EP (1) | EP1001361A3 (en) |
| JP (1) | JP4210372B2 (en) |
| CA (1) | CA2289319C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6909562B2 (en) * | 2001-09-13 | 2005-06-21 | Toshiba Tec Kabushiki Kaisha | Control apparatus for magnetic read |
| US7446897B2 (en) * | 2003-04-04 | 2008-11-04 | Axiohm Transaction Solutions, Inc. | Transactional printer with slip processing mechanism |
| US20080288403A1 (en) * | 2007-05-18 | 2008-11-20 | Clay Von Mueller | Pin encryption device security |
| CN102222211B (en) * | 2011-07-06 | 2014-03-05 | 深圳市铭特科技有限公司 | Magcard decoding method and magcard reading device |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3831009A (en) | 1973-08-03 | 1974-08-20 | Westinghouse Learning Corp | Timing system for optically scanned documents |
| US3914789A (en) | 1973-11-19 | 1975-10-21 | Ibm | Manually operated magnetic card encoder |
| US4040097A (en) | 1975-01-20 | 1977-08-02 | Kabushiki Kaisha Sankyo Seiki Seisakusho | Magnetic card-reader with movable magnetic head |
| US4599510A (en) * | 1984-01-05 | 1986-07-08 | Merlyn Barth | Vibration-minimizing magnetic card reader |
| MY106779A (en) * | 1990-09-07 | 1995-07-31 | Mitsubishi Heavy Ind Ltd | Magnetic recording method and circuit for toll road ticket. |
| US5235166A (en) * | 1991-02-14 | 1993-08-10 | Xtec Incorporated | Data verification method and magnetic media therefor |
| US5770846A (en) * | 1996-02-15 | 1998-06-23 | Mos; Robert | Method and apparatus for securing and authenticating encoded data and documents containing such data |
-
1998
- 1998-11-13 JP JP32312498A patent/JP4210372B2/en not_active Expired - Fee Related
-
1999
- 1999-10-27 US US09/427,649 patent/US6561419B1/en not_active Expired - Fee Related
- 1999-11-08 EP EP99308891A patent/EP1001361A3/en not_active Withdrawn
- 1999-11-10 CA CA002289319A patent/CA2289319C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP1001361A3 (en) | 2001-05-30 |
| JP2000149437A (en) | 2000-05-30 |
| EP1001361A2 (en) | 2000-05-17 |
| JP4210372B2 (en) | 2009-01-14 |
| US6561419B1 (en) | 2003-05-13 |
| CA2289319A1 (en) | 2000-05-13 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20141110 |