JP2513619B2 - Magnetic card reader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] A circuit for determining the front and back of a magnetic card inserted in a reading circuit of a conventional magnetic card reading device and a comparison unit for slicing a read signal are switched between high and low reference voltages and supplied. With a simple reading circuit with a switch, it is possible to read data from a magnetic card regardless of whether it is inserted on the front or back.

[Industrial applications]

 The present invention relates to a magnetic card reader.

In particular, there is a demand for a magnetic card reader capable of automatically reading even a wrong insertion of front and back of a cash voucher in an automatic refund device for a winning horse betting ticket used by an unspecified number of people.

[Conventional technology]

In the conventional magnetic card reader, as shown in FIG. 4, when the magnetic card 1 is inserted from the insertion guide 51 in the direction of the solid line arrow, it is fed inside by the first roller 21 and the first detection sensor.
When the magnetic card 1 is detected at 31, the entrance shutter 52 is opened, the magnetic card 1 is bitten by the second roller 22 and further advances in the direction of the solid line arrow, and the data for each track recorded by the read head 4 is read.

The data pulse train has its waveform corrected by removing noise in the amplifier section 61 of the reading circuit shown in FIG. 3, and sliced with a predetermined reference voltage V1 in the comparing section 62 as shown in FIG. 2 (a). , The analog signal is converted into a digital signal and transmitted to the switching control unit 63 having a track assignment changing circuit (not shown).

At that time, the switching control unit 63 detects the start or end code signal recorded on the magnetic card 1, and the comparison unit 62
Decide whether to send the received data as it is or to change and assign the data to each track by the track assignment changing circuit (normally rearrange the code string of each digital signal) and transmit the data. It is compared with the reference data in the central computer or the memory (not shown) of the device.

If the verification result read data is normal, the magnetic card 1 shown in FIG. 4 is ejected to the stacker 53 by the fifth roller 23. When the reading is not performed, when the magnetic card 1 reaches the third detecting sensor 32, the driving motor (not shown) is stopped and reversed, and the magnetic card 1 is sent back in the direction opposite to the solid arrow and returned to the insertion guide 51. .

[Problems to be solved by the invention]

The problem with the conventional magnetic card reader described above is that when a magnetic card is inserted backwards and forwards, it is dealt with, but due to incorrect insertion into the front and back, reading will be defective if the front and back are inserted incorrectly. Then, the collation result in the switching control section becomes abnormal, and when it reaches the third detection sensor, each roller is rotated in the reverse direction and returned to the insertion guide, which causes a decrease in the operating rate of the magnetic card reader. .

Further, if a magnetic head for reading the back surface is additionally installed in order to cope with erroneous insertion on the front and back sides, the transport mechanism of the magnetic card reader becomes complicated and the manufacturing cost of the apparatus increases.

From the above situation, the present invention can easily and inexpensively read the magnetic card by inserting the front and back sides and the front and back sides.
The purpose is to provide a new magnetic card reader.

[Means for solving problems]

The above problem is that the clock signal output from the amplifier section 61 for correcting the waveform of the data read for each track is taken out from the reading circuit of the conventional magnetic card reading apparatus as shown in FIG. A comparator 71 for comparing with the slicing reference voltage V1 at the time of normal insertion, a front / back determination circuit 72 for determining the front / back based on the comparison result, and further slicing the read signal pulse of each track with the reference voltage to digitally output the analog signal. As shown in FIG. 2, the comparison unit 62, which converts the signal into a signal, determines the reference voltage according to the determination made by the front / back determination circuit 72.
This is solved by the magnetic card reader of the present invention in which a switching device 73 for switching between high and low V1 and V2 is added.

[Action]

That is, in the present invention, the front side of the magnetic card 1, that is,
Utilizing the fact that the magnetic flux leaks to the opposite side of the written magnetic surface, the minute clock signal magnetic flux in the start code or end code range of the magnetic card 1 is detected by the read head 4, and the noise is removed in the amplifier section 61. Then, the output level with the corrected waveform is compared with the reference voltage V1 of the normal insertion by the comparator 71 and output to the front / back determination circuit 72. When the output voltage is equal to or higher than the reference voltage V1, the front / back determination circuit 72 determines that the front surface is inserted and the lower surface is inserted.

Then, as shown in FIG. 2, when it is determined that the surface is inserted, the comparison unit 6 is operated by the switching unit 73 having two kinds of high and low reference voltages V1 and V2.
2) High slice reference voltage V1 is supplied, and in the case of back side insertion, low leakage magnetic flux readable reference voltage V1
The read pulse is sliced with the reference voltage V1 or V2 to convert the analog signal of the pulse train into a digital signal, and the signal is switched to the switching control unit 63.
By sending the data to the device, it becomes possible to read the magnetic card regardless of whether it is inserted on the front side or the back side.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a reading circuit diagram of the magnetic card reader according to the present embodiment.

As shown in the figure, it is branched from the clock signal line output from the amplifier section 61 that eliminates noise and corrects the read waveform,
A comparator 71 having a differential amplifier circuit for comparing and outputting the output level of the clock signal and the slice reference voltage V1 at the time of normal insertion, and a front / back determining circuit for determining the front / back by the output voltage and transmitting each signal. A circuit having 72, and further a comparator 62 for slicing the read signal of each track with a predetermined reference voltage and converting the analog signal into a digital signal, as shown in FIG. A switching controller 73 having a switch (not shown) for switching and supplying V2, and a switching controller 63 for controlling the reader including a track allocation changing circuit (not shown) for changing the allocation of each track, It is composed of the front / back determination circuit 72 and a circuit connected by a signal line.

Then, the clock signal in the range of the start code or the end code of the magnetic card 1 read by the read head is input to the differential amplifier circuit incorporated in the comparator 71 after correcting the waveform in the amplifier section 61, and inputting the waveform. When the level is higher than the reference voltage V1 as shown in FIG. 2 (a), that is, when the insertion is normal, the output voltage from the operation amplification circuit becomes 1 or more,
When inserting in the opposite direction, the output voltage is low because the output level is low. The front / back determination circuit 72 shown in FIG. 1 determines the front / back based on the output voltage, and switches the front / back signals.
73 and a switching control unit 63 having a track assignment changing circuit
Send to

The switch 73 receives a predetermined reference voltage V1 shown in FIG. 2 (a) when receiving a signal shown in the table, and a low reference voltage V2 shown in FIG.
The magnetic card 1 is supplied to the comparison unit 62 of FIG.
The signal in the data area range is sliced by the supplied reference voltage V1 or V2 to be converted into a digital signal and transmitted to the switching control unit 63.

Also, the switching control unit 63 issues a command to the track allocation changing circuit in response to the front or back signal received from the front / back determination circuit 72 to change the allocation of the digital signal from the comparing unit 62 to a predetermined data track. Reading can be performed when the magnetic card 1 is inserted in either the front or back or the front and back.

〔The invention's effect〕

As described above, according to the present invention, by adding an extremely simple circuit, it is possible to easily read the magnetic card in both front and back and front and rear insertions, and it is possible to obtain an economic effect such as an improvement in the operating rate of the reading device. It can be expected and is extremely useful industrially.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a read circuit of a magnetic card reader according to an embodiment of the present invention, and FIG. 2 is a diagram showing a relationship between a read signal and a slice reference voltage according to the present embodiment. FIG. 3 is a block diagram showing a reading circuit of a conventional magnetic card reader, and FIG. 4 is a diagram showing a magnetic card transport mechanism of the conventional magnetic card reader. In the figure, 1 is a magnetic card, 21 is a first roller, 22 is a second roller, 23 is a fifth roller, 31 is a first detection sensor, 32 is a third detection sensor, 4 is a read head, 51 is an insertion guide, 52 is an entrance shutter, 53 is a stacker, 61 is an amplifier section, 62 is a comparison section, 63 is a switching control section, 71 is a comparator, 72 is a front / back determination circuit, and 73 is a switch.

Claims (1)

(57) [Claims] 1. A magnetic card reading device for reading information stored in a magnetic card, comprising: a front / back determination circuit for determining front / back of the magnetic card; and a first reference voltage based on front / back signals from the front / back determination circuit. A switch for switching between a second reference voltage whose voltage level is lower than the first reference voltage, and when the magnetic card is a table, the recording data recorded on the magnetic card and the first reference voltage If the comparison is made, or if the magnetic card is the back side, the comparison unit that compares the recording data recorded on the magnetic card with the second reference voltage, and the front and back signals from the front and back determination circuit, A magnetic card reader comprising: a switching control circuit for allocating and changing data from a comparison unit to a predetermined data track.