PROBLEM TO BE SOLVED: To provide a light receiving structure capable of perpendicularly introducing incident light into a filter plate in terms of characteristics of a thin film type filter, in measuring total light quantity from all directions at one point in a space.SOLUTION: In order to introduce light from all directions into a light sensitive element evenly, a structure employs a double shell made of material capable of diffusing and transmitting light. With outer shells 1-2, 1-3, light received from all directions is fed to a semi-spherical inner shell 1-5, and with the inner shell, the light is fed to an internal filter 1-7 and a light receiving element 1-8. The outer shells 1-2, 1-3 are configured to receive light from the all directions at the same azimuth sensitivity, and in order to adjust a light receiving azimuth sensitivity, to upper parts thereof, an opaque umbrella 1-1 is attached. By feeding to the filter 1-7 light passing through a cylindrical passage 1-6 of a center part from the inner shell 1-5, an incident angle of light into the filter is substantially perpendicular to a filter surface.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】空間の1点に対して全方位から来る光の総量を測定するにあたり、薄膜式のフィルターの特性上、入射光をフィルター板に垂直に導入可能な受光構造を提供する。【解決手段】全方位からの光を均一に感光素子に導入するため、構造は光を拡散透過する材質で作った2重の殻とする。外殻1-2、1-3で全方位から受けた光を半球状の内殻1-5に送り、内殻によりこれを内部のフィルター1-7と受光素子1-8に送る。外殻1-2、1-3は、全方位からの光を同じ方位感度で受光し、また、受光方位感度を調整するため、上部に不透明の傘1-1を付けてある。内殻1-5から中心部の筒状の経路1-6を通した光をフィルター1-7へ送ることにより、フィルターへの入射角はフィルター面に垂直に近い光となる。【選択図】図1
