PURPOSE: To improve sensitivity and reliance, by a method wherein a polarizer and an analizer are provided within a sensing element.
CONSTITUTION: A polarizer 10 having a multilayer film as an interference film and an analyzer 11 having a multilayer film as an interference film are arranged so that they cut a Faraday element made of lead glass in fixed shaped. Said polarizer 10, analyzer 11 and Faraday element 9 are formed in one body by forming films in said cut portions by evaporation etc. and again covering the cut portions by lead glass. A photosensor according to this structure has the advantage that sensitivity of a photo-magnetic field sensor is improved, as the polarizer and analizer are formed within the optical-Faraday element having multilayer films, and further, that the reliability is improved and the size can be minimized, as each optical-components are formed monoblockly.
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TAI SHIYUUICHI
ARANISHI TOSHIO
