JPS6284407A - magnetic stripe reader - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] 3. Scope of Claims [Field of Application of the Invention] The present invention relates to a manual reading device for magnetic stripe data on cards, passbooks, etc. The present invention relates to a magnetic stripe reader suitable for reading media.

[Background of the invention]

The block diagram of a conventional manual magnetic stripe reader is shown in Fig. 6.
FIG. 7 shows a time chart of the reading operation.

A magnetic stripe recording medium such as a card or a bankbook is read by a head 1, and the head output is amplified by an amplifier circuit 2 and then shaped into a waveform by a waveform shaping circuit 3. The BSY generator 5 generates a BSY signal from the output of the waveform shaping circuit 3, which indicates that the medium is inserted into the reading device, and outputs it from the output circuit 10. While the BSY signal is at a low (L) level, the gate 7 is turned on and the demodulator 4 operates to demodulate the read data signal RDD and the read clock signal RCP and output them from the output circuits 8 and 9. data signal Rr)
r) is output as a signal identifying high (H) or low (L) recorded information in synchronization with the read clock signal RCP. The clock signal RCP is generated corresponding to the reading speed by the head 1 for manual reading. When error detection circuit 6 detects an error in the demodulated signal, it turns off gate 7 and makes demodulator 4 inoperable.

Incidentally, recording information on a medium generally includes a start code and an end code, and it is the data from this start code to the end code that is read as valid information. Therefore, the conventional device excludes the number of bits necessary for initial sign detection, defines the maximum number of omitted bits of the card, and controls the BSY signal so as to omit the α bit from the flux change first detected by the head. Reading information after the bit.

However, with conventional methods, there is a limit to increasing the number of limit bits (α bits) in order to read cards and passbooks or other media with the same reading device, as card records are standardized by JIS. , recording of media other than cards is determined by the writing device, and there is no guarantee that the data will be stable within the limit number. For this reason, there has been a drawback that subsequent data may be garbled or the beginning code detection may become impossible due to overwriting by writing devices with different recording start positions on the medium and jitter caused by positional deviation.

[Purpose of the invention]

An object of the present invention is to prevent valid information from being erroneously read during manual reading due to jitter that occurs due to overwriting or misalignment of information on a medium that is recorded with a writing device that writes magnetic stripes at different recording start positions. It is an object of the present invention to provide a magnetic stripe reader that prevents such problems and correctly reads valid information.

[Summary of the invention]

In order to achieve the above object, the present invention provides a medium separation sensor and a stable area position detection sensor, reads the data to the stable area position for media other than cards, resets the demodulator, and resynchronizes. This makes it possible to correctly read only valid data even if the recording start position is different from the medium.

[Embodiments of the invention]

FIG. 1 shows a block diagram of an embodiment of the present invention, 11 is a gate circuit, 12 is a medium separation sensor (SL), 13 is a reset position detection sensor (82), 14.15 is a waveform shaping circuit, 16 1 is a reset pulse generating circuit, 17 is a terminal device, and the rest is the same as in FIG. 6.

FIG. 2 shows the positional relationship between the sensors 12 and 13 and the head 1. That is, the distance β between the head l and the sensor 12 is the minimum value greater than the card size, and the distance α between the head 1 and the sensor 13 is
is the minimum value required for initial sign detection.

The reading operation example shown in FIG. 1 will be described below with reference to the time chart shown in FIG. 3. Sensor 12 by manual operation
The medium is moved against the head 1 from the direction of , and the magnetic stripe information on the medium is read. The reading device passes the head output signal through an amplification circuit 2 and a waveform shaping circuit 3, and in the case of card reading, generates a BSY generation unit charge CT4 signal, and generates a BSY signal indicating that the medium is inserted into the reading device. occurs. While the BSY signal is at "L" level, the gate 7 sets the demodulator 4, so that the demodulator 4 reads information and outputs the read data signal RDD and the read clock RCP. After the RDD signal is demodulated, it is output as a signal identifying the content of the recorded information as H"I," in synchronization with the read clock RCP. FIG. 4 shows the relationship between RCP and RDD. Since the read clock RCP is manually read, it is generated by demodulating the head output corresponding to the read side. When reading a bank account, BSY is used as well as a card.
While the signal is at the (L II level, the demodulator 4 reads information, but when the interpreter passes the sensor 13, the medium separation is such that if the sensor 12 is at the L level, the reset pulse generation circuit 16, the demodulator 4 is reset through the gate 7 to achieve resynchronization, demodulate the RCP, read the information again, and output the RDD.

FIG. 5 shows the card recording format and passbook recording format. In the figure, the shaded area is valid data.

Generally, recording information on a medium has a start code and an end code that indicate the range of valid data. The above demodulation unit reset position is determined by the S2 sensor 13 at a position before the number of bits necessary for detecting the starting code. This is area B of the passbook record format shown in FIG. Therefore, the inability to detect the start code and the erroneous recognition of the start code due to the garbled data caused by the synchronization difference caused by the information recorded before the reset position can be avoided by resynchronizing reading by resetting the demodulator unit as described above. By identifying the data as information data with the terminal device 17, only valid data can be read normally.

〔Effect of the invention〕

As is clear from the above description, the manual magnetic stripe reading device has the effect of being able to read the magnetic stripe of any size medium other than cards by being used also as a card.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the relationship between the head and the sensor, FIGS. 3 and 4 are time charts for explaining the operation of FIG. 1, and FIG. FIG. 5 is a diagram showing an example of a recording format of a medium, FIG. 6 is a block diagram of a conventional manual magnetic stripe reading device, and FIG. 7 is an operation time chart. DESCRIPTION OF SYMBOLS 1... Magnetic head for reading, 4... Head output demodulation section, 5... BSY generation section, 1-2... Medium separation sensor, 13... Demodulation reset position detection sensor, 16...・Reset pulse generation circuit.

Claims (1)

[Claims] (1) In a device that reads magnetic stripe information on a medium,
A first medium identification sensor and a second stable area position detection sensor are provided, and when the medium passes the second sensor, the information reading demodulator is reset and resynchronized based on the state of the first sensor. A magnetic stripe reading device characterized by reading only valid information from media having different recording positions.