| 摘要 |
PURPOSE:To obtain a small-sized magnetic sensor which has high stability to noises by applying the slice level to a terminal of a coil of a magnetic head via a series resistance and a pull-up resistance and connecting said terminal of the coil to the 2nd input of a voltage comparator to produce pulse signals. CONSTITUTION:Resistances 3 and 4 are connected to a terminal 1b of a coil 1a to improve the accuracy of a voltage comparator 2, and this terminal 1b is connected to the 1st input 2a of the comparator 2. It is needed to apply the slice voltage of about 10'20% to the signal in order to delete the noises induced to a magnetic head 1. The slice voltage is produced at another terminal 1c of the coil 1a by a series resistance 5 and a pull-up resistance 6, and the terminal 1c is connected to the 2nd input 2b of the comparator 2. A resistance 7 serves as the pull-up resistance of an output. The levels of resistances 3 and 4 are selected approximately at the center 5V of the power supply voltage 10V. As a result, the working accuracy is improved for the comparator 2 and furthermore the resistance deviation of the comparator 2 gives no effect to the slice voltage. |
