Digital Magnetic Encoding/Reading Head
Original Publication Date: 1988-Mar-01
Included in the Prior Art Database: 2005-Feb-15
In a digital magnetic encoder/reader, a circuit is provided for effectively detecting the wear of the magnetic head, taking advantage of the characteristic that, when the head is worn out, its output waveform becomes more flat or less sharpened than that of a head not worn. In the circuit shown in Fig. 1 for detecting head wearing, the operational amplifiers OA1, OA2, capacitors C1, C2 and registers R1, R2 are substantially equivalent, respectively. The forward voltage of the diode D1 is lower than that of the diode D2. Referring to Figs. 1 and 2, the output signal W of the head is supplied to the amplifiers OA1 and OA2 to produce the peak-hold signal W1 and W2 through the diodes D1 and D2.