JPH08147430A - Magnetic recording medium reader - Google Patents

Abstract

PURPOSE: To provide the magnetic recording medium reader which can easily detect a foreign matter on a magnetic recording medium that causes a defect in printing and surely print information on the magnetic recording medium. CONSTITUTION: As for an electric signal which is amplified and outputted by an amplifying circuit 7 after a magnetic head 5 makes a magnetic read, a comparator circuit 8 uses a foreign matter detection level as a threshold value and generates a pulse wave of '0' when the signal is less than the threshold value, and when the continuation of a pulse absence state for a specific time (t) is detected on the basis of the data, a CPU 12 judges that the foreign matter is detected; and the electric signal is inputted to a peak holding circuit 9 and a peak detecting circuit 10 as well to detect its peak point, the peak value at the peak point is found through an A/D converter 11, and when the detection of the peak point having a peak value less than a specific values continues for longer than a specific time, the CPU 12 judges that the foreign matter is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording medium reading device for reading information recorded on a magnetic recording medium such as a prepaid card.

[0002]

2. Description of the Related Art In recent years, a card reader (magnetic recording medium reading device) which reads magnetically recorded information from a prepaid card or the like, which is a widely used magnetic recording medium, and performs a predetermined process is as follows. When the prepaid card is inserted into the card reader, the prepaid card is guided by the magnetic head while being conveyed on the conveying path, where various information such as the charge balance recorded at a predetermined position of the prepaid card is read. For example, for the charge balance, a predetermined charge is subtracted from the read information, and the result is magnetically recorded at a predetermined position of the prepaid card by a magnetic head. , Transported in the transport path and guided to the print head,
Here, for example, at the predetermined position of the prepaid card, the date,
Information such as the charge balance is printed. The content printed by the print head is used as a usage history of the prepaid card to inform the user of the prepaid card.

[0003]

In such a card reader, if a tape is attached to a prepaid card or foreign matter such as scratches or dirt is present, an attempt is made to magnetically record information on the portion by a magnetic head. In doing so, a magnetic writing error may occur. In addition, when printing is performed on that part with the print head, it may cause printing failure.Therefore, the printing may be unclear on the prepaid card, or it may be returned to the user without being printed, causing improper use of the prepaid card. There is a problem that it may become a cause of trouble with the user.

Therefore, according to the present invention, a tape, a flaw, a mark on a magnetic recording medium such as a prepaid card, which causes printing failure,
It is an object of the present invention to provide a magnetic recording medium reading device that can easily detect foreign matter such as dirt and can reliably print on the magnetic recording medium.

[0005]

A magnetic recording medium reading device of the present invention magnetically reads information recorded on a magnetic recording medium having a print area and outputs an electric signal according to the magnetic output. Means for detecting whether or not a foreign matter is present on the magnetic recording medium based on an electric signal output from the reading means, and when the presence of the foreign matter is not detected by the detecting means, The magnetic recording medium is provided with a printing unit for performing a predetermined printing in a printing area.

The magnetic recording medium reader of the present invention is
A reading unit that magnetically reads information recorded on a magnetic recording medium having a print area and outputs an electric signal according to the magnetic output, and a level of the electric signal output from the reading unit are set in advance. Detecting means for detecting whether or not a foreign matter is present on the magnetic recording medium by comparing with a foreign matter detection level, and a printing area of the magnetic recording medium when the presence of the foreign matter is not detected by the detecting means. And a printing means for performing a predetermined printing.

The magnetic recording medium reader of the present invention is
A reading unit that magnetically reads information recorded on a magnetic recording medium having a print area and outputs an electric signal according to the magnetic output, and a level of the electric signal output from the reading unit are set in advance. Detecting means for detecting whether or not a foreign substance is present on the magnetic recording medium depending on whether or not the level of the electric signal is lower than the foreign substance detection level for a predetermined time or more as compared with the foreign substance detection level. And a printing means for performing a predetermined printing on the printing area of the magnetic recording medium when the presence of the foreign matter is not detected by the detection means.

The magnetic recording medium reader of the present invention is
A reading unit that magnetically reads information recorded on a magnetic recording medium having a print area and outputs an electric signal according to the magnetic output, and a peak value of a waveform of the electric signal output from the reading unit in advance. A detection unit that detects whether or not a foreign substance is present on the magnetic recording medium by comparing it with a predetermined value that is set, and when the presence of the foreign substance is not detected by the detection unit, the magnetic recording medium of the magnetic recording medium is detected. A printing unit for performing predetermined printing in the printing area is provided.

The magnetic recording medium reading device of the present invention comprises:
A reading unit that magnetically reads information recorded on a magnetic recording medium having a print area and outputs an electric signal according to the magnetic output, and a peak value of a waveform of the electric signal output from the reading unit in advance. Detecting means for detecting whether or not a foreign substance is present on the magnetic recording medium by comparing whether or not a state in which the peak value is lower than the predetermined value continues for a predetermined time or more as compared with a predetermined value that is set; And a printing means for performing a predetermined printing on the printing area of the magnetic recording medium when the presence of the foreign matter is not detected by the detection means.

Further, the magnetic recording medium reader of the present invention is
A reading unit that magnetically reads information recorded on a magnetic recording medium having a print area and outputs an electric signal according to the magnetic output, and a level of the electric signal output from the reading unit are set in advance. A first detection unit that detects whether or not a foreign substance is present on the magnetic recording medium by comparing with a foreign substance detection level and a peak value of a waveform of an electric signal output from the reading unit are preset. Second detecting means for detecting whether or not a foreign matter is present on the magnetic recording medium by comparing the predetermined value with a predetermined value,
The first and second detection means include a printing means for performing a predetermined printing in the printing area of the magnetic recording medium when the presence of the foreign matter is not detected.

[0011]

Operation: Information recorded on a magnetic recording medium is magnetically read, an electric signal corresponding to the magnetic output is output, and the level of the electric signal is lower than a preset foreign matter detection level for a predetermined time or longer. Depending on whether it is continuous or not, it is detected whether or not a foreign matter is present on the magnetic recording medium, and when the presence of the foreign matter is not detected, by performing predetermined printing in the print area of the magnetic recording medium, It is possible to easily detect foreign matter such as tapes, scratches, stains, etc. on the magnetic recording medium, which causes printing failure, and reliably perform printing on the magnetic recording medium.

Further, the information recorded on the magnetic recording medium is magnetically read and an electric signal corresponding to the magnetic output is output, and the peak value of the waveform of the electric signal is lower than a preset predetermined value. Whether or not a foreign substance is present on the magnetic recording medium is detected depending on whether or not the state continues for a predetermined time or longer, and when the presence of the foreign substance is not detected, a predetermined print is performed on the print area of the magnetic recording medium. By doing
Tapes, scratches, and scratches on magnetic recording media that cause printing defects
Foreign matter such as dirt can be easily detected, and printing on the magnetic recording medium can be reliably performed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of a prepaid card as a magnetic recording medium used in a card reader as a magnetic recording medium reading device according to the present embodiment.

In FIG. 1, the prepaid card P is inserted into an insertion opening (not shown) of a card reader, which will be described later, in the direction of the arrow in FIG. 1 and is conveyed in that direction. The inside of the prepaid card P is mainly configured by laminating a base material such as paper or plastic, a magnetic recording layer, and a printing layer in this order. In addition, the prepaid card P has three parts along the insertion direction when viewed from the surface of the prepaid card P.
A row of printing areas 1 is provided, and three rows of magnetic recording areas 2 are provided so as to overlap with each of the three rows of printing areas 1, and have a length in the insertion direction of the prepaid card P. That is, print characters are formed on the surface of the prepaid card P by applying heat to the print layers of the three rows of print areas 1 by the print head described later, and the magnetic recording areas 2 of the three rows are written by the magnetic head described later. Information can be read from and written to the magnetic recording layer.

A prepaid card P as shown in FIG.
However, when it is inserted into the insertion slot of the card reader, it is conveyed on the conveying path and guided to the magnetic head. Figure 2
Shows the positional relationship between the prepaid card P and the magnetic head. In FIG. 2, above the prepaid card P, three magnetic heads 5 are arranged in a line along the surface of the prepaid card P in a direction perpendicular to the transport direction and corresponding to the three magnetic recording areas 2 of the prepaid card P. Is provided, and below the prepaid card P, a rubber roller 6 that rotates in the carrying direction is provided.
The prepaid card P is supported and conveyed. Each of the three magnetic heads 5 passes through the print layer of the prepaid card P and reads information at a predetermined magnetic level with respect to each of the magnetic recording layers of the three rows of the magnetic recording areas 2 of the prepaid card P. It is installed so that it can be done.

FIG. 3 schematically shows the structure of the main part of a card reader as a magnetic recording medium reading device according to this embodiment. In FIG. 3, each magnetic head 5 reads the information magnetically recorded in the magnetic recording area 2 corresponding to the magnetic head of the prepaid card P shown in FIG. 1 as described above as an electric signal. Each magnetic head 5 is adapted to read information along the carrying direction of all the corresponding magnetic storage areas 2. At this time, if there is a tape, scratch, dirt, or other foreign matter in the magnetic recording area 2 on the surface of the prepaid card P, the magnetic head 5
When read by, the magnetic output decreases because there is a gap between the magnetic head and the prepaid card P only at the location where the foreign matter exists. Therefore, from the magnetic head 5, the voltage level of the portion where the foreign matter exists is read. The electric signal with reduced voltage is output. The present invention focuses on this fact to detect foreign matter.

The electric signal output from the magnetic head 5 is
The amplitude is input to the amplifier circuit 7, its amplitude is amplified with a predetermined amplification degree, and the comparator circuit 8, the peak hold circuit 9,
It is output to the peak detection circuit 10.

The output of the comparator circuit 8 is connected to the CPU 12. Also, a RAM 13 is connected to the CPU 12, and under the control of the CPU 12, various data and the like are temporarily stored when performing predetermined information processing.

The comparator circuit 8 provides a pulse wave for detecting foreign matter by providing a slice level higher than the slice level for recognizing information with respect to the waveform of the electric signal output from the magnetic head 5. Is generated, and the foreign matter is detected under the control of the CPU 12 based on the pulse wave.

Peak hold circuit 9 and peak detection circuit 1
A / D converter 11 is connected to 0, and further A / D converter
The output of the converter 11 is connected to the CPU 12. These detect the peak of the waveform of the electric signal output from the magnetic head 5 and detect the foreign matter based on the peak value.

The above configuration (that is, the magnetic head 5, the amplification circuit 7, the comparator circuit 8, the peak hold circuit 9, the peak detection circuit 10, and the A / D converter 11) is used in the prepaid card P. 3 sets are provided corresponding to each of the three columns of magnetic recording areas 2 provided in
Comparator circuit 8 and A / D in each set
The output from the converter 11 is connected to the CPU 12, and its operation processing and the like are all the same.

Next, with reference to FIG. 4, the foreign substance detection processing performed in the comparator circuit 8 and the CPU 12 will be described. FIG. 4A shows a specific example of the waveform of the electric signal output from the amplifier circuit 7. FIG.
In (a), the electric signal output from the amplifier circuit 7 has a waveform 20 that vibrates above and below the reference level L0.

Two slice levels, an information recognition level L1 and a foreign matter detection level L2, are set for the waveform 20 of the electric signal. The information recognition level L1 is a slice level for recognizing information that is set up and down with respect to the reference level L0 with equal width. That is,
A pulse wave is generated with "1" when the level of the electric signal is higher than this value and "0" when the level is lower than the information recognition level L1. The data of this pulse wave is
The information is temporarily stored in the RAM 13 and is recognized under the control of the CPU 12. After that, the recognized information is temporarily stored in the RAM 13, and under the control of the CPU 12, various information processing regarding the charge balance and the like is performed.

On the other hand, the foreign matter detection level L2 is a slice level for detecting a foreign matter that is set to be larger than the width set as the information recognition level L1 above and below the reference level L0. That is, for example, in FIG.
With respect to the waveform 20 of the electric signal as shown in (a), the foreign substance detection level L2 is used as a threshold value, and when it is larger than this value, "1" is generated, and when it is smaller, a pulse wave is generated. A specific example of the pulse waveform is shown in FIG.

In the waveform of the electric signal shown in FIG. 4 (b), if there is a region in which a level smaller than the foreign substance detection level L2 exists, as shown in FIG. 4 (b), "" corresponds to that portion. It is "0".

The pulse wave data as shown in FIG. 4 (a) is temporarily stored in the RAM 13, and the foreign matter is detected under the control of the CPU 13 based on the data. . That is, from the pulse wave data stored in the RAM 13, for example, in the pulse wave as shown in FIG. 4B, the state of “0”, that is, the state where the pulse is missing continues for a predetermined time t. In other words, in other words, for example, when it is detected that about 20 pulses are continuously missing, the CPU 12 determines that a foreign substance is detected in this area.

With the magnetic head 5, the prepaid card P
When the reading of information from the magnetic recording area 2 is completed, as a result, an electric signal output from the magnetic head 5 is obtained corresponding to the length of the prepaid card P in the carrying direction. Taking advantage of this, the CPU 12
The foreign matter detected as described above is the prepaid card P.
It is possible to detect in which position of the. That is, the principle thereof will be described with reference to FIG. 5. It is assumed that the comparator circuit 8 obtains a pulse waveform 30 corresponding to the length of the prepaid card P along the carrying direction as shown in FIG. At this time, in the time period in which the entire pulse waveform 30 is detected, a region in which the foreign matter Q is detected from the pulse waveform data, that is, a region in which the pulse is missing for a predetermined time t is detected. It is possible to calculate at which position in the length of the prepaid card P in the carrying direction the foreign matter Q exists based on the time when the prepaid card P is carried and the carrying speed of the prepaid card P.

Next, referring to FIG. 6, a peak hold circuit 9, a peak detection circuit 10, an A / D converter 11, a CPU
The foreign substance detection processing performed in 12 will be described. Similar to FIG. 4A, FIG. 6 shows a specific example of the waveform of the electric signal output from the amplifier circuit 7.

Peak hold circuit 9 and peak detection circuit 1
An electric signal having a waveform 20 as shown in FIG. 6 is input to 0. The peak detection circuit 9 has a peak point R1 of the waveform 20.
R20 is detected. Each detected peak point R
1 to R20 are start signals for the A / D converter 11.

The peak hold circuit 9 holds the peak point of the waveform 20 detected by the peak detection circuit 10 as an analog signal. The held peak points R1 to R20 are output to the A / D converter 11.

In the A / D converter 11, for each peak point R1 to R20 input as an analog signal, the start signal from the peak detection signal 10 is activated for each peak point, and the peak value of that peak point is reached. Is converted into a digital signal. The peak value of each peak point R1 to R20 converted into this digital data is R via the CPU 12.
It is temporarily stored in the AM 13.

In the CPU 12, based on the peak value of each of the peak points R1 to R20 stored in the RAM 13, the peak value is equal to or less than a predetermined value, and a predetermined number of peak points having a peak value less than or equal to the predetermined value are consecutive. When it is detected, that is, when the detection of the peak point having the peak value equal to or smaller than the predetermined value continues for the predetermined time or longer, it is determined that the foreign matter is detected in the area. That is, for example, in the waveform as shown in FIG. 6, among the peak points R1 to R20 detected by the peak detection circuit 10, the peak points R1 to R10, R1.
The peak values of 7 to R20 are larger than the predetermined value, but the peak values of peak points R11 to R16 are smaller than the predetermined value. At this time, when a predetermined number of peak points R11 to R16 having a peak value smaller than the predetermined value continue, for example, about 20, a foreign substance is determined to have been detected in this area.

With the magnetic head 5, the prepaid card P
As a result of reading information from the magnetic recording area 2, the magnetic head 5 outputs an electric signal corresponding to the length of the prepaid card P in the carrying direction, as described above. Therefore, as described with reference to FIG.
It is possible to detect at which position of the prepaid card P the foreign matter detected as described above exists by U12. The principle will be described. That is, for example, in the time from the output of the electric signal from the magnetic head 5 to the end of the detection, a region where a foreign substance is detected, that is, a peak point having a peak value equal to or less than a predetermined value is continuously detected for a predetermined time or more. Then, based on the time when the detected area is detected and the transport speed of the prepaid card P, it is possible to calculate at which position in the length of the prepaid card P in the transport direction the foreign matter exists.

In this way, the comparator circuit 8 and the CPU
Foreign matter detection processing performed in step 12, and peak hold circuit 9, peak detection circuit 10, A / D converter 11, C
When the foreign substance detection process performed in the PU 12 is executed in parallel and the foreign substance is detected in one of these detection processes, the foreign substance is detected from the prepaid card P. Further, since the foreign matter detection processing is executed for each of the three magnetic heads 5 provided corresponding to each of the three rows of magnetic storage areas 2 of the prepaid card P, the three magnetic heads 5 are therefore provided. When a foreign matter is detected in any one of the information read in step 1, it means that the foreign matter is detected in the prepaid card P. Next, FIG.
Return to description.

A printing unit 14 is connected to the CPU 12,
The printing unit 14 is mainly composed of a print head. The prepaid card P has a magnetic head 5 depending on the conveying path.
After being guided to, the printing section 14 is further guided.

Explaining with reference to FIG. 7, first, various information under the control of the CPU 12 with respect to the information such as the charge balance read from the magnetic storage area 2 of the prepaid card P and recognized by the comparator circuit 8 and the CPU 12. Information processing is performed. Information such as the resulting charge balance is displayed on the printing unit 14
Then, as a result of the foreign matter detection processing as described above, only for the prepaid card P in which no foreign matter is detected, the date and the charge balance are sequentially displayed in the print area 1 provided on the surface thereof by the print head of the printing unit 14. Information such as is printed.

On the other hand, when a foreign substance is detected on the prepaid card P in the above-mentioned foreign substance detection processing, the printing unit 1
In No. 4, without printing, it is guided to the card return port of the card reader as it is by the transport path and returned from there. Further, in order to notify the staff of the card reader of the present embodiment that the foreign matter is detected and the information such as the position of the detected foreign matter on the prepaid card P, the lamp is turned on or a buzzer sound is generated. It is also possible to display it on a CRT display device.

In the above description, the foreign substance detection process performed by the comparator circuit 8 and the CPU 12 and the foreign substance detection process performed by the peak hold circuit 9, the peak detection circuit 10, the A / D converter 11 and the CPU 12 are described. When the foreign substances are detected in one of these detection processes by executing them in parallel, it is determined that the foreign substances are detected from the prepaid card P. However, the present invention is not limited to this case, and both of the two foreign substance detection processes are performed. It may be determined that the foreign matter is detected from the prepaid card P when the foreign matter is detected from the. In addition, the comparator circuit 8, CP
Foreign matter detection processing performed in U12, peak hold circuit 9, peak detection circuit 10, A / D converter 11,
There is no problem even if only one of the foreign matter detection processes performed in the CPU 12 is performed. However, when the two foreign matter detection processes are executed in parallel, the reliability of foreign matter detection can be further improved.

As described above, according to the above embodiment, the magnetic head 5 magnetically reads information from the magnetic storage area 2 of the prepaid card P and outputs it as an electric signal, and the electric signal is amplified. The electric signal obtained by amplification in 7 is inputted to the comparator circuit 8, and the foreign object detection level L2 is used as a threshold for the electric signal. When the value is larger than this value, it is "1", and when it is smaller, it is "0". When a pulse wave is generated and it is detected based on the data that the pulse is missing for a predetermined time t, the CPU 12 determines that a foreign matter is detected, and further, Within the time when the entire pulse waveform 30 corresponding to the length of the prepaid card P along the transport direction is detected, a region where the pulse is missing for a predetermined time t is detected. When the foreign matter is detected, the printing unit 14 calculates the position of the foreign matter in the length of the prepaid card P in the transportation direction based on the time of the prepaid card P and the transportation speed of the prepaid card P. By returning the prepaid card P without printing and notifying the staff member of that fact, printing is performed by using the magnetic head 5 originally provided in the card reader without adding mechanical equipment. It is possible to easily detect foreign matter such as tapes, scratches, and stains on the prepaid card, which cause defects, and to reliably print on the prepaid card.

On the other hand, the electric signal output from the amplifier circuit 7 is also input to the peak hold circuit 9 and the peak detection circuit 10, and the peak detection circuit 10 detects the peak point of the waveform of the electric signal and holds the peak hold. The peak value of each detected peak point is obtained via the circuit 9 and the A / D converter 11, and based on this peak value, detection of a peak point having a peak value of a predetermined value or less continues for a predetermined time or longer. If you do, C
It is determined by the PU 12 that a foreign matter has been detected, and further, within the time when the entire pulse waveform 30 corresponding to the length of the prepaid card P along the transport direction is detected, a peak point having a peak value equal to or less than a predetermined value is detected. Based on the time when a region where the detection is continuously detected for a predetermined time or more is detected and the position of the foreign substance existing in the length of the prepaid card P in the conveyance direction, the position of the foreign substance is determined. If the foreign matter is calculated and the foreign matter is detected, the prepaid card P is returned without printing by the printing unit 14 and the staff is notified of that fact, thereby adding the card without adding mechanical equipment. By using the magnetic head 5 originally provided in the reader, it is possible to easily detect foreign matter such as tapes, scratches, stains, etc. on the prepaid card that cause printing defects.
Printing on the prepaid card can be reliably performed.

Further, the foreign substance detection processing performed in the comparator circuit 8 and the CPU 12, the peak hold circuit 9, the peak detection circuit 10, the A / D converter 11, and the CPU 1 are performed.
By executing the foreign substance detection processing in 2 in parallel, the reliability of foreign substance detection can be further improved.

[0042]

As described above, according to the present invention, it is possible to easily detect foreign matter such as tape, scratches, stains, etc. on the magnetic recording medium, which causes defective printing, and to reliably print on the magnetic recording medium. It is possible to provide a magnetic recording medium reading device that can perform the above.

[Brief description of drawings]

FIG. 1 is a diagram for explaining the configuration of a prepaid card used in a card reader according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining a positional relationship between a prepaid card and a magnetic head.

FIG. 3 is a diagram schematically showing a configuration of a main part of a card reader according to an embodiment of the present invention.

4A and 4B are diagrams for explaining a foreign matter detection process based on a slice level, FIG. 4A is a diagram showing a specific example of a waveform of an electric signal output from an amplifier 7, and FIG. The figure is
The figure which showed the specific example of the pulse waveform output from the comparator circuit 8.

FIG. 5 is a diagram for explaining the principle for calculating the position of a foreign substance on a prepaid card.

FIG. 6 is a diagram for explaining foreign matter detection processing based on a peak value of a waveform of an electric signal.

FIG. 7 is a diagram for explaining the operation of the printing unit.

[Explanation of symbols]

P ... Prepaid card (magnetic recording medium), 1 ... Printing area, 2 ... Magnetic recording area, 5 ... Magnetic head, 7 ... Amplifier circuit, 8 ... Comparator circuit, 9 ... Peak hold circuit,
10 ... Peak detection circuit, 11 ... A / D converter, 12 ... C
PU, 13 ... RAM, 14 ... Printing section, L2 ... Foreign matter detection level (slice level), R1 to R20 ... Peak points.

Claims (6)

[Claims] 1. A reading unit that magnetically reads information recorded on a magnetic recording medium having a print area and outputs an electric signal corresponding to the magnetic output, and based on the electric signal output from the reading unit. A detecting means for detecting whether or not a foreign matter is present on the magnetic recording medium; and a printing means for performing a predetermined printing on a print area of the magnetic recording medium when the presence of the foreign matter is not detected by the detecting means. A magnetic recording medium reading device comprising: 2. A reading unit that magnetically reads information recorded on a magnetic recording medium having a print area and outputs an electric signal corresponding to the magnetic output, and a level of the electric signal output from the reading unit. Is compared with the preset foreign matter detection level,
A detection means for detecting whether or not a foreign matter is present on the magnetic recording medium; and a printing means for performing a predetermined printing on a print area of the magnetic recording medium when the presence of the foreign matter is not detected by the detection means. A magnetic recording medium reading device comprising: 3. A reading unit that magnetically reads information recorded on a magnetic recording medium having a print area and outputs an electric signal according to the magnetic output, and a level of the electric signal output from the reading unit. Whether a foreign substance is present on the magnetic recording medium by comparing whether or not the level of the electric signal is lower than the foreign substance detection level continuously for a predetermined time or more. A magnetic recording medium reading device comprising: a detection unit for detecting the presence of a foreign matter; and a printing unit for performing a predetermined printing on the printing area of the magnetic recording medium when the presence of the foreign matter is not detected by the detection unit. apparatus. 4. A reading unit that magnetically reads information recorded on a magnetic recording medium having a print area and outputs an electric signal according to the magnetic output, and a waveform of the electric signal output from the reading unit. By comparing the peak value of
A detection means for detecting whether or not a foreign matter is present on the magnetic recording medium; and a printing means for performing a predetermined printing on a print area of the magnetic recording medium when the presence of the foreign matter is not detected by the detection means. A magnetic recording medium reading device comprising: 5. A reading unit that magnetically reads information recorded on a magnetic recording medium having a print area and outputs an electric signal according to the magnetic output, and a waveform of the electric signal output from the reading unit. The peak value of is compared with a preset predetermined value, and whether or not a foreign substance is present on the magnetic recording medium is determined by whether the peak value is lower than the predetermined value for a predetermined time or more. A magnetic recording medium reading device comprising: a detecting unit that detects the presence of foreign matter; and a printing unit that performs predetermined printing in a printing area of the magnetic recording medium when the presence of foreign matter is not detected by the detecting unit. . 6. A reading unit that magnetically reads information recorded on a magnetic recording medium having a print area and outputs an electric signal corresponding to the magnetic output, and a level of the electric signal output from the reading unit. Is compared with the preset foreign matter detection level,
By comparing the peak value of the waveform of the electric signal output from the reading unit with a predetermined value set in advance, the first detecting unit detecting whether or not a foreign substance is present on the magnetic recording medium,
Second detection means for detecting whether or not a foreign matter exists on the magnetic recording medium; and a print area of the magnetic recording medium when the presence of the foreign matter is not detected by the first and second detecting means. A magnetic recording medium reading device, comprising: a printing unit configured to perform predetermined printing on the magnetic recording medium.