PURPOSE: To detect the moving direction and the speed of a moving body, rotating body, etc., which move in an optional direction by forming radially plural mutually separated electrodes and common electrodes facing those electrodes on both main surfaces of one pyroelectric crystal substrate.
CONSTITUTION: Four pyroelectric detection units 26 are composed of sectorial electrodes 22 formed on one main surface of the pyroelectric crystal substrate 21, respective heat absorbing films 23 printed thereupon, common electrodes 24 formed on the opposite surface, and the pyroelectric crystal substrate 21 between those electrodes 22 and common electrodes 24 around the center point P of the substrate 21. Consequently, the moving direction and moving speed of the moving body are detected from the timing of signal outputs of those four pyroelectric detection units 26. Similarly, the rotating direction and rotating speed of the rotating body are detected from the output timing of signal outputs of the four pyroelectric detection units 26.
SETO HIROYUKI
MURATA MITSUHIRO
| JPS54998A | 1979-01-06 |