JP2022026087A - Card reader and its fraudulence detection method - Google Patents

Abstract

To provide a card reader capable of detecting fraudulence of installation or the like of a skimming member even if the depth of a body part is shorter than a required length for performing processing to a card.SOLUTION: A card reader includes an insertion part for inserting a card and a body part connected to the insertion part, where the card is conveyed between a front position as a side closer to the insertion part in the body part and a rear position as a side far from the insertion part. In the card reader, a card detection sensor SW is provided in the insertion part, a sensor PD1 on a near side is provided so as to correspond to the front position, and a back side sensor PD3 is provided so as to correspond to the rear position. An alarm 1 is set when the card detection sensor SW is on, an alarm 2 is set if the back side sensor PD3 is on when the card should be in the front position, and an alarm 3 is set if the sensor PD1 on the near side is on when the card should be in the rear position. Fraudulence is detected according to a combination of the set alarms 1 to 3.SELECTED DRAWING: Figure 3

Description

The present invention relates to a card reader and a fraud detection method thereof.

A card reader that reads and writes data to a card such as a magnetic card is used by being mounted on a higher-level device such as an ATM (Automated Teller Machine). A card reader is generally composed of an insertion portion into which a card is inserted by a user and a main body portion in which a card inserted into the insertion portion is pulled in to read or write data to the card. The insertion unit is provided with a card detection sensor that detects that a card has been inserted. A transport path, which is a path for transporting cards, is formed in the main body, and a roller for transporting the card, a motor for driving the roller, a head for reading and writing data to the card, and the like are provided. Will be. It has become a big social problem that foreign matter (that is, skimming member) is installed in the card reader in order to illegally acquire the information written on the magnetic card, that is, to perform skimming, and the card reader is also resistant to skimming. Configuration is required.

Patent Document 1 has a shutter member provided between the insertion portion and the main body portion, and a capacitance sensor provided inside the main body portion to detect the presence or absence of a skimming member, and the card is provided in the insertion portion. When it is detected that is inserted, the shutter member is opened and the card is pulled into the main body, the shutter member is closed when the card is pulled into the main body, and then the data is read / written to / from the card inside the main body. The card reader that performs the above is disclosed.

Japanese Unexamined Patent Publication No. 2019-219826

When performing various processes including reading and writing data on a card that is a magnetic card, it is necessary to transport the card along the transport path and move the card relative to the magnetic head provided in the main body. There is. Therefore, the depth of the main body must be sufficiently longer than the longitudinal dimension of the card, including the distance required to move the card relative to the magnetic head in the main body. However, depending on the size of the host device on which the card reader is installed, the depth of the main body may have to be shortened. In that case, after the card is once taken into the main body of the card reader, it is necessary to move the card from the main body to a position where the rear end of the card pops out into the insertion portion while processing the card. When moving the card to a position where the rear end of the card pops out into the insertion part in this way, the shutter member must be open, and at that time, a foreign object such as a skimming member is set inside the main body of the card reader. There is a risk of being

An object of the present invention is to provide a card reader capable of detecting fraud such as installation of a skimming member even if the depth of the main body is shorter than the length required for processing the card, and a fraud detection method thereof. To provide.

The card reader of the present invention is a card reader that processes a card, and is an insertion portion into which a card is inserted, a main body portion connected to the insertion portion, and a card inserted inside the main body portion. A card detection sensor that is placed in the insertion section and outputs ON when a card is inserted, and a card detection sensor that is provided in the transfer path and detects an object containing a card and outputs ON. It has a first sensor and a second sensor, and a control unit that controls the transfer of cards. In the main body, the card is conveyed between the front position, which is closer to the insertion part, and the rear position, which is farther from the insertion part, and the first sensor is arranged to detect the card in the front position. The second sensor is arranged to detect the card in the rear position. The control unit sets alarm 1 when the card detection sensor outputs ON after the card has been taken into the main body, and alarm 2 when the second sensor outputs ON when controlling the movement of the card to the front position. Is set and alarm 3 is set when the first sensor outputs ON when the control to move the card to the rear position is performed, alarm 1 is set and at least one of alarm 2 and alarm 3 is set. When it is, it is judged to be abnormal.

In the card reader of the present invention, control is performed to move the card to either the front position or the rear position when the card detection sensor provided in the insertion portion outputs ON, that is, when the alarm 1 is set. Nevertheless, contrary to the control, when the first sensor or the second sensor detects an object such as a card, it is determined to be abnormal. As a result, it becomes possible to accurately detect the fear of installation of skimming members.

In the card reader of the present invention, the rear end portion of the card may protrude from the main body portion to the insertion portion within a range not detected by the card detection sensor when in the front position. According to the present invention, even if the card reader has a card reader in which the rear end portion of the card protrudes toward the insertion portion during normal processing of the card, there is a risk of installing a skimming member accurately. It will be possible to detect.

The card reader of the present invention is further provided with a third sensor provided in the transport path at a position sandwiched between the front position and the rear position to detect an object including a card and output ON, and the control unit controls the card. Alarm 2 is also set when the 3rd sensor outputs ON when controlling to move to the front position, and also when the 3rd sensor outputs ON when controlling to move the card to the rear position. The alarm 3 may be set. The position sandwiched between the front position and the rear position is generally a position where a magnetic head or the like is arranged, and is a position where protection from skimming members is particularly desired. By arranging the third sensor at such a position, it becomes possible to more accurately detect the fear of installing the skimming member around the magnetic head.

In the card reader of the present invention, the control unit may determine that the card movement has been detected when the alarm 1 is canceled and at least one of the alarm 2 and the alarm 3 is set. With this configuration, it is possible to detect and report an event that may be caused by a sensor failure or dirt.

In the card reader of the present invention, if the card detection sensor stops the ON output after the alarm 1 is set and both the alarm 2 and the alarm 3 are canceled, the alarm 1 is canceled. May be good. Since the card detection sensor provided in the insertion portion may react even by raindrops or the like, according to this configuration, it is possible to automatically recover from the alarm in such a case.

In the card reader of the present invention, a shutter member that restricts access to the inside of the main body portion can be provided at the boundary between the insertion portion and the main body portion. By providing the shutter member, the risk of installing the skimming member or the like can be further reduced.

The fraud detection method of the present invention is provided in an insertion portion into which a card is inserted, a main body portion connected to the insertion portion, a transport path provided inside the main body portion and in which the inserted card is conveyed, and a transport path. It has a first sensor and a second sensor that detect an object including a card and output ON, and a card detection sensor that is arranged in an insertion portion and detects that a card has been inserted and outputs ON. In the main body, the card is conveyed between the front position on the side closer to the insertion part and the rear position on the side far from the insertion part, the first sensor is arranged to detect the card in the front position, and the second The sensor is a fraud detection method in a card reader arranged to detect a card in the rear position. In this fraud detection method, when the card detection sensor outputs ON after the card has been taken into the main body, alarm 1 is set, and when the control to move the card to the front position is performed, the second sensor outputs ON. When alarm 2 is set and control is performed to move the card to the rear position, alarm 3 is set when the first sensor outputs ON, alarm 1 is set, and at least one of alarm 2 and alarm 3 is set. When it is set, it is judged as abnormal.

In the fraud detection method of the present invention, control for moving the card to either the front position or the rear position is controlled when the card detection sensor provided in the insertion portion outputs ON, that is, when the alarm 1 is set. When the first sensor or the second sensor detects an object such as a card contrary to the control, it is determined to be abnormal. As a result, it becomes possible to accurately detect the fear of installation of skimming members.

In the fraud detection method of the present invention, the rear end portion of the card may protrude from the main body portion to the insertion portion within a range not detected by the card detection sensor when in the front position. According to the fraud detection method of the present invention, even if the card reader has a card reader in which the rear end portion of the card protrudes toward the insertion portion during normal processing of the card, there is a risk of installing a skimming member. It will be possible to accurately detect such things.

In the fraud detection method of the present invention, when the card is controlled to be moved to the front position, it is provided in the transport path at a position sandwiched between the front position and the rear position, detects an object including the card, and turns ON. Even if the alarm 2 is set even when the output third sensor outputs ON, and the alarm 3 is set even when the third sensor outputs ON when the control to move the card to the rear position is performed. good. The position where the third sensor is provided is usually the position where the magnetic head is provided, and by setting the alarm using the output of the third sensor as well, there is a risk of installing a skimming member around the magnetic head. It will be possible to detect more accurately.

In the fraud detection method of the present invention, when the alarm 1 is canceled and at least one of the alarm 2 and the alarm 3 is set, it may be determined that the card movement is detected. With this configuration, it is possible to detect and report an event that may be caused by a sensor failure or dirt.

In the fraud detection method of the present invention, if the card detection sensor stops the ON output after the alarm 1 is set and both the alarm 2 and the alarm 3 are canceled, the alarm 1 is canceled. You may. Since the card detection sensor provided in the insertion portion may react even by raindrops or the like, according to this configuration, it is possible to automatically recover from the alarm in such a case.

According to the present invention, even a card reader whose main body depth is shorter than the length required for processing a card can detect fraud such as installation of a skimming member.

It is a schematic sectional drawing which shows the structure of the card reader of one Embodiment of this invention. It is a block diagram of the card reader shown in FIG. It is a flowchart explaining fraud detection processing in a card reader. It is a flowchart explaining the alarm release process.

Next, a mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of a card reader according to an embodiment of the present invention. The card reader 1 shown in FIG. 1 executes various processes including reading and writing data on a card 2 such as a magnetic card.

The card reader 1 is connected to an insertion unit 3 into which the card 2 is inserted by the user, and a main body that is connected to the insertion unit 3 and pulls in the card 2 inserted into the insertion unit 3 to execute various processes on the card 2. It has a part 4. A card detection sensor SW for detecting whether or not the card 2 is inserted is attached to the insertion unit 3. The card detection sensor SW may, for example, detect that the card 2 has been inserted by blocking the optical path between the light emitting unit and the light receiving unit by the card 2, or may include a prehead. The card 2 may be detected by detecting the magnetic stripe of the card 2. Any form of card detection sensor SW can be used as long as it can reliably detect that the card 2 has been inserted into the insertion unit 3. A shutter member 6 that can be opened and closed is provided between the transport unit 3 and the main body 4 to prevent unauthorized access to the inside of the main body 4.

Inside the main body 4, there is a transport path 41 through which the card 2 is transported when processing the card 2 is executed, and a transport roller 42 provided along the transport path 41 for transporting the card 2. , A magnetic head 43 provided substantially in the center of the transport path 41 in the length direction, and three sensors PD1 to PD3 provided along the transport path 41 to detect an object such as a card 2. In the illustrated example, three pairs of transport rollers 42 are provided. The three sensors PD1 to PD3 are the front side sensor PD1 provided on the side close to the insertion part 3, the back side PD3 provided on the back side of the main body part 4, that is, the back side PD3 provided at a position far from the insertion part 3, and the front side. It consists of an intermediate sensor PD2 provided at an intermediate position between the sensor PD1 and the rear sensor PD3. The front sensor PD1 corresponds to the first sensor, the intermediate sensor PD2 corresponds to the third sensor, and the rear sensor PD3 corresponds to the second sensor. As the sensors PD1 to PD3, for example, an optical type sensor that detects an object by blocking the optical path by an object, or a capacitance type sensor that detects an object by detecting a change in capacitance is used. be able to.

FIG. 2 is a block diagram showing an electrical configuration of the card reader 1 of the present embodiment. As an electrical configuration, the card reader 1 controls the operation of the card reader 1, inputs / outputs data to / from the host device, and outputs an alarm to the host device when an error is detected. It includes a read / write circuit 51 provided between the magnetic head 43 and the control circuit 50, a transfer motor 52 for driving the transfer roller 42, and a solenoid 53 for opening and closing the shutter member 6. The transfer motor 52 and the solenoid 53 are controlled by the control circuit 50. The card detection sensor SW and the detection outputs of the sensors PD1 to PD3 are input to the control circuit 50. The control circuit 50 is composed of, for example, a microprocessor.

When the card reader 1 performs some processing on the card 2, the card 2 is taken into the main body 4 and is conveyed inside the main body 4 along the transport path 41 according to the content of the processing. More specifically, when the processing for the card 2 is being performed, the card 2 is called a rear position, which is a position where the card 2 is conveyed to the innermost part of the main body 4 (left side in the figure), and a front position. Which position is the position where it is conveyed to the insertion portion 2 side, or is in a state where it is conveyed between these two positions. FIG. 1 shows the position of the card 2 in the rear position and the position of the card 2 in the front position. The transfer of the card 2 between the rear position and the pronto position is realized by driving the transfer motor 52 by the control circuit 50. When reading / writing data to / from the card 2 by the magnetic head 43, the card 2 needs to move relative to the magnetic head 43. Therefore, the position of the magnetic head 43 is a position sandwiched between the front position and the rear position.

In the card reader 1 of the present embodiment, the depth of the main body 4 (the length in the left-right direction in the drawing) is set in order to perform various processes on the card 2 while carrying the card 2 taken into the main body 4. Shorter than required. Therefore, when the card 2 is in the front position, the rear end portion of the card 2 protrudes from the main body portion 4 toward the insertion portion 3. However, even if the rear end portion of the card 2 is projected, the position does not reach the position where the card detection sensor SW in the insertion portion 3 can detect the card 2. Further, in the above three sensors PD1 to PD3, only the front sensor PD1 detects the card 2 when the card 2 is in the front position, and only the back sensor PD3 detects the card when the card 2 is in the rear position. It is arranged to detect. Therefore, when the card 2 is in either the front position or the rear position, the intermediate sensor PD2 does not detect the card 2. In the following description, for each of the card detection sensor SW and the sensors PD1 to PD3, the signal output from the sensor when the sensor is detecting the card 2 is called "ON", and the card 2 is detected. The signal output when there is no signal is called "OFF". The signal output when the output of the ON signal is stopped is OFF.

In this card reader 1, since the shutter member 6 can be opened when the card 2 is in the front position, foreign matter such as a skimming member can be set inside the main body 4 while the shutter member 6 is open, or from the front position. When being transported to the rear position, foreign matter may be drawn into the main body 4 together with the card 2. Therefore, when the control circuit 50 detects the insertion of the card 2 into the insertion portion 3 and executes the processing for the card 2, the skimming member is installed by using the output of the card detection sensor SW and the sensors PD1 to PD3. Execute the process to detect fraud such as. FIG. 3 shows a fraud detection process executed by the control circuit 50. The fraud detection process is executed in parallel with the other processes separately from the other processes executed by the control circuit 50. In the fraud detection process, three types of alarms, alarm 1, alarm 2 and alarm 3, are set as fraud detection alarms. In the following description, "ON" indicates that a certain alarm is set, and "OFF" indicates that the alarm is not set or is canceled.

In the fraud detection process, when the card detection sensor SW detects that the card 2 has been inserted into the insertion unit 3, the control circuit 50 drives the solenoid 53 to open the shutter member 6, and drives the conveyor motor 52 to drive the card. It starts when 2 is taken into the inside of the main body 4. When the card 2 is taken into the main body 4, the card 2 is first conveyed to the rear position. In step 101, the control circuit 50 waits until the card 2 has been taken in. Whether or not the loading of the card 2 is completed, that is, whether or not the card 2 is in the rear position can be determined by whether or not the output of the rear sensor PD3 has changed to ON. When the output of the back sensor PD3 is turned ON in step 101 and the completion of the card 2 capture is confirmed, the control circuit 50 then determines in step 102 whether the output of the card detection sensor SW is ON. When the card 2 has been taken in and the card 2 is being processed, the card 2 should not be detected by the card detection sensor SW even if the card 2 is in the front position. Therefore, when the output of the card detection sensor SW is ON in step 102, the control circuit 50 turns alarm 1 ON (that is, sets it) in step 103, and proceeds to step 104.

When the output of the card detection sensor SW is not ON, that is, OFF in step 102, the control circuit 50 determines in step 111 whether the alarm 2 is OFF and the alarm 3 is OFF. The alarm 1 is an alarm based on the detection result of the card detection sensor SW, but the card detection sensor SW is provided in the insertion unit 3 and is easily affected by the external environment such as raindrops. It may be set even if it is not illegal. Therefore, once the alarm 1 is turned on, the step 102 is executed, and at that time, when the output of the card detection sensor SW is OFF and it is determined in the step 111 that both the alarm 2 and the alarm 3 are OFF. , The control circuit 50 turns off the alarm 1 in step 112. That is, the alarm 1 is canceled. The step 112 may be executed while the alarm 1 is already OFF, but in that case, the control circuit 50 keeps the alarm 1 OFF. After step 112 is executed, the process proceeds to step 104. If at least one of alarm 2 and alarm 3 is ON in step 111, the process proceeds to step 104 as it is.

In step 104, control by other processing performed by the control circuit 50 determines whether the card 2 should currently be in the front position. When it is determined that the card 2 should be in the front position, in step 105, the control circuit 50 determines whether the output of at least one of the intermediate sensor PD2 and the rear sensor PD3 is ON. Since neither the intermediate sensor PD2 nor the back sensor PD3 should detect the card 2 when the card 2 is in the front position, the control circuit 50 turns on the output of at least one of the intermediate sensor PD2 and the back sensor PD3 in step 105. If this is the case, in step 106, the alarm 2 is turned on, and then, in order to repeatedly execute the fraud detection process, the process proceeds to step 102. In step 105, when both the output of the intermediate sensor PD2 and the output of the rear sensor PD3 are OFF, the process proceeds to step 102 as it is.

If it is not determined in step 104 that the card 2 should be in the front position, then in step 113, the card 2 is now in the rear position due to control by another process performed by the control circuit 50. It is determined whether it should be. If it cannot be determined that the card 2 should be in the rear position here, it is the timing when the card 2 is being conveyed between the front position and the rear position, so that the card 2 is transferred to the front position or the rear position. The process returns to step 104 to wait for it to complete. On the other hand, when it is determined in step 113 that the card 2 should be in the rear position, in step 114, the control circuit 50 determines whether the output of at least one of the front sensor PD1 and the intermediate sensor PD2 is ON. judge. Since neither the front sensor PD1 nor the intermediate sensor PD2 should detect the card 2 when the card 2 is in the rear position, the control circuit 50 turns on the output of at least one of the front sensor PD1 and the intermediate sensor PD2 in step 114. If this is the case, in step 115, the alarm 3 is turned on, and then, in order to repeatedly execute the fraud detection process, the process proceeds to step 102. In step 114, when both the output of the front sensor PD1 and the output of the intermediate sensor PD2 are OFF, the process proceeds to step 102 as it is.

By the fraud detection process described above, at least one alarm is turned on when the position where the presence of the card 2 is assumed does not match the output of the card detection sensor SW or the sensors PD1 to PD3. The alarm 1 may be turned off after being turned on, but the alarm 2 and the alarm 3 are maintained in the ON state as they are when they are turned on unless the cancellation process described later is performed. Table 1 shows what kind of determination can be made by the combination of alarm 1, alarm 2 and alarm 3. The normal state is when all alarms are OFF.

As shown in Table 1, when the alarm 1 is OFF and at least one of the other alarms is ON, it is determined that the card 2 has moved from the original position inside the card reader 1 (that is, the card movement detection). can. When it is determined that the card movement is detected by the combination of the alarms 1 to 3, the control circuit 50 notifies the host device of the card movement. Here, the reason why the higher-level device is not immediately notified as skimming member detection is that it is possible that the sensor failure or dirt may be the cause, and there is room for recovery processing without immediately determining skimming. .. In the recovery process, for example, automatic adjustment of each sensor, cleaning of the inside of the transport path 41 by inserting a cleaning card, and the like are executed. When the alarm 1 is ON and the alarm 2 and the alarm 3 are OFF, as described above, the alarm 1 is waited to be OFF (released). When the alarm 1 is ON and at least one of the alarm 2 and the alarm 3 is ON, the skimming member may have been set, so that the control circuit 50 notifies the host device as the skimming member detection. , Maintain the alarm state.

The alarm 1 may be canceled when the card detection sensor SW is turned off, but the alarm 2 and the alarm 3 are not automatically canceled, and are canceled by, for example, a cancellation process by the host device. The release process by the host device is performed, for example, by a maintenance worker inspecting the card reader 1 and then inputting a dedicated command. FIG. 4 is a flowchart showing the alarm release process. First, in step 121, the host device determines whether the input command is alarm 1 release. As described above, the alarm 1 is automatically canceled based on the output of the card detection sensor SW or the like, but it can also be canceled by a command. When the host device determines in step 121 that the command is to cancel the alarm 1, the host device turns off the alarm 1 in step 122, that is, cancels the alarm 1, and then proceeds to step 123. If the alarm 1 is not released, the host device proceeds to step 123 as it is. In step 123, the host device determines whether the input command is alarm 2 release. When the host device determines in step 123 that the command is to cancel the alarm 2, it turns off the alarm 2 in step 124 and then proceeds to step 125. If not, the host device proceeds to step 125 as it is. In step 125, the host device determines whether the input command is alarm 3 release. When the host device determines in step 125 that the command is to cancel the alarm 3, the higher-level device turns off the alarm 2 in step 124 and then ends the alarm cancellation process. If not, the host device ends the alarm release process as it is.

According to the card reader 1 of the present embodiment described above, even if the card reader 1 has a depth shorter than the length required for processing the card 2, the skimming member can be detected. In particular, by providing the intermediate sensor PD2, it becomes possible to detect the installation of a skimming member or the like in the vicinity of the magnetic head 43.

In the card reader based on the present invention, the intermediate sensor PD2 provided at a position neither the front position nor the rear position is not always necessary. However, the position of the intermediate sensor PD2 is near the magnetic head 43, which is a position where foreign matter such as a skimming member is likely to be set. Therefore, it is preferable to provide the intermediate sensor PD2. Further, a plurality of front side sensors PD1, intermediate sensor PD2, and rear side sensor PD3 can be provided. By increasing the number of sensors, the ability to detect small foreign objects is improved. For example, when a plurality of front side sensors PD1 are provided, it is determined that when all of the front side sensors PD1 output OFF, it corresponds to "PD1 is OFF" in the process shown in FIG. .. If at least one front sensor PD1 is ON, the process shown in FIG. 3 is executed as "PD1 is ON". The same applies when a plurality of intermediate side sensors PD2 are provided and when a plurality of back side sensors PD3 are provided.

In the card reader based on the present invention, the shutter member 6 provided at the boundary between the insertion portion 3 and the main body portion 4 is not always indispensable, and in the present invention, the card 2 is the main body when processing the card 2. Any card reader that protrudes from the unit 4 to the insertion unit 3 can be applied. However, it is preferable to provide the shutter member 6 not only to prevent the skimming member from being installed inside the main body 4 but also to prevent raindrops and dust from entering the inside of the main body 4.

1 ... card reader; 2 ... card; 3 ... insertion part; 4 ... main body part; 41 ... transport path; 42 ... transport roller; 43 ... magnetic head; 50 ... control circuit; 51 ... read / write circuit; 52 ... transport motor 53 ... Solenoid; PD1 ... Front sensor, PD2 ... Intermediate sensor, PD3 ... Back sensor; SW ... Card detection sensor.

Claims (11)

A card reader that processes cards
The insertion part where the card is inserted and the insertion part
The main body connected to the insertion part and
A transport path for transporting the card inserted inside the main body, and a transport path for transporting the card.
A card detection sensor that is placed in the insertion section, detects that the card has been inserted, and outputs ON.
A first sensor and a second sensor provided in the transport path, which detect an object including the card and output ON,
A control unit that controls the transfer of the card,
Have,
In the main body, the card is conveyed between the front position, which is closer to the insertion portion, and the rear position, which is farther from the insertion portion.
The first sensor is arranged to detect the card in the front position.
The second sensor is arranged to detect the card in the rear position.
The control unit sets an alarm 1 when the card detection sensor outputs ON after the card has been taken into the main body.
When the second sensor outputs ON when the control for moving the card to the front position is performed, the alarm 2 is set and the alarm 2 is set.
When the first sensor outputs ON when the control for moving the card to the rear position is performed, the alarm 3 is set and the alarm 3 is set.
A card reader that determines an abnormality when the alarm 1 is set and at least one of the alarm 2 and the alarm 3 is set. The card reader according to claim 1, wherein the rear end portion of the card protrudes from the main body portion to the insertion portion within a range not detected by the card detection sensor when in the front position. Further, it has a third sensor provided in the transport path at a position sandwiched between the front position and the rear position to detect the object including the card and output ON.
The control unit also sets the alarm 2 when the third sensor outputs ON when the card is controlled to be moved to the front position.
The card reader according to claim 1 or 2, wherein the alarm 3 is set even when the third sensor outputs ON when the card is controlled to be moved to the rear position. Any one of claims 1 to 3 that the control unit determines that the card movement has been detected when the alarm 1 is canceled and at least one of the alarm 2 and the alarm 3 is set. The card reader described in the section. The control unit cancels the alarm 1 if the card detection sensor stops the ON output after the alarm 1 is set and both the alarm 2 and the alarm 3 are canceled. , The card reader according to any one of claims 1 to 4. The card reader according to any one of claims 1 to 5, wherein a shutter member for restricting access to the inside of the main body portion is provided at a boundary between the insertion portion and the main body portion. The insertion portion into which the card is inserted, the main body portion connected to the insertion portion, the transport path provided inside the main body portion for transporting the inserted card, and the transport path provided in the transport path to include the card. It has a first sensor and a second sensor that detect an object and output ON, and a card detection sensor that is arranged in the insertion portion and detects that the card has been inserted and outputs ON. The card is conveyed between the front position on the side closer to the insertion portion and the rear position on the side far from the insertion portion, and the first sensor is arranged to detect the card in the front position. The second sensor is a fraud detection method in a card reader arranged to detect the card in the rear position.
When the card detection sensor outputs ON after the card has been taken into the main body, the alarm 1 is set.
When the second sensor outputs ON when the control for moving the card to the front position is performed, the alarm 2 is set and the alarm 2 is set.
When the first sensor outputs ON when the control for moving the card to the rear position is performed, the alarm 3 is set and the alarm 3 is set.
A fraud detection method for determining an abnormality when the alarm 1 is set and at least one of the alarm 2 and the alarm 3 is set. The fraud detection method according to claim 7, wherein the rear end portion of the card protrudes from the main body portion to the insertion portion within a range not detected by the card detection sensor when in the front position. When the control to move the card to the front position is performed, the object provided in the transport path at the position sandwiched between the front position and the rear position is detected and ON is output. The alarm 2 is also set when the third sensor outputs ON.
The fraud detection method according to claim 7 or 8, wherein the alarm 3 is set even when the third sensor outputs ON when the card is controlled to be moved to the rear position. The fraud according to any one of claims 7 to 9, wherein when the alarm 1 is canceled and at least one of the alarm 2 and the alarm 3 is set, it is determined that the card movement has been detected. Detection method. Claims 7 to 7 to cancel the alarm 1 if the card detection sensor stops the ON output after the alarm 1 is set and both the alarm 2 and the alarm 3 are canceled. The fraud detection method according to any one of 10.

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