Abstract: A medium processing device is provided having a front panel which is formed with an aperture where a magnetic recording medium is inserted into or ejected from and which partitions an outside of a device from an inside of the device. A magnetic head is provided in the inside of the device for writing or reading information in or from the magnetic recording medium a shading filter is provided in at least one part of the front panel for shading visible light and a foreign matter detecting mechanism is provided on an inner side of the device with respect to the shading filter for detecting a foreign matter that is attached to the outside of the device.

Abstract: A card reader includes a shutter provided at a card insertion port, a shutter opening and closing detection device for detecting the shutter being opened and a control device for taking the card shaped medium into the inside of the card reader. In a waiting state where the shutter is closed and a card shaped medium is not present in the inside of the card reader and further, when the shutter opening and closing detection device detects opening of the shutter without detecting insertion of a card shaped medium from the card insertion port, the control device decides occurrence of abnormality to perform abnormality coping processing.

Abstract: A demodulation method for magnetic data may include the steps of reading magnetic data with a magnetic head, generating a digital signal from a read analog signal, comparing an inversion time interval of the digital signal with a bit reference time interval, and generating bit data on the basis of comparing result of the digital signal. This demodulation method for magnetic data may further include a first step of comparing the inversion time interval of the digital signal with a bit lacking reference time interval which is set to be longer than the bit reference time interval, and a second step of discontinuing generation of the bit data when the inversion time interval of the digital signal is detected to be longer than the bit lacking reference time interval in the first step.

Abstract: A medium processing device is provided having a front panel which is formed with an aperture where a magnetic recording medium is inserted into or ejected from and which partitions an outside of a device from an inside of the device. A magnetic head is provided in the inside of the device for writing or reading information in or from the magnetic recording medium a shading filter is provided in at least one part of the front panel for shading visible light and a foreign matter detecting mechanism is provided on an inner side of the device with respect to the shading filter for detecting a foreign matter that is attached to the outside of the device.

Abstract: A card reader includes a shutter provided at a card insertion port, a shutter opening and closing detection device for detecting the shutter being opened and a control device for taking the card shaped medium into the inside of the card reader. In a waiting state where the shutter is closed and a card shaped medium is not present in the inside of the card reader and further, when the shutter opening and closing detection device detects opening of the shutter without detecting insertion of a card shaped medium from the card insertion port, the control device decides occurrence of abnormality to perform abnormality coping processing.

Abstract: The present invention provides an object sensor configured such that excitation coils (13c and 13d) and a detection coil (12) are separately disposed, and the detection is performed in accordance with the balance between the excitation coils (13c and 13d) in a pair, a residual variation amount after the impedance due to a DC resistance part and the like has been offset and removed is obtained at high sensitivity with excellent linearity while using a small core body (11), regardless of the impedance including a DC resistance part. Additionally, the object sensor to be used as an inlet sensor is located in an appropriate position on a more upstream side than the read/write position in an insertion direction of the IC card. A contact terminal portion of the IC card is sensed whereby to detect the validity of the card inserted into the apparatus from a card insertion slot.