PURPOSE: To contrive to reduce crosstalk noise by adding two dummy detectors and providing a guard rail between a sense detector and a dummy detector and between a stretcher and a new dummy detector.
CONSTITUTION: Dummy detectors 6, 7 are provided further to a sense detector 1 and a dummy detector 2. Further, a part 4a of a guard rail 4 is provided between the detectors 1 and 2 and other part 4b is provided between a stretcher 3 and the detector 6. With a bubble coming at a position of the stretcher 3, each crosstalk noise to the detectors 1, 2, 6 and 7 is shown in waveforms 1, 2, 6 and 7. The waveforms 1, 6 have the same amplitude to the crosstalk noise and are opposite in phase to a connecting point A. The amplitude of the waveforms 2, 7 with respect to a connecting point B differs from the state mentioned above but the phase is opposite to each other. Thus, signals at the connecting points A, B are cancelled and fed to a sense amplifier. Thus, the noise is zero and the N is minimized to improve the S/N.
KUROIWA KENICHI
KATSURA YASUFUMI
Next Patent: COIL DRIVING CIRCUIT FOR MAGNETIC BUBBLE MEMORY