SENSITIVITY DIRECTIVITY CORRECTING PLATE OF ILLUMINANCE SENSOR, CORRECTION METHOD OF SENSITIVITY DIRECTIVITY OF ILLUMINANCE SENSOR, AND LUMINAIRE WITH BRIGHTNESS ADJUSTING FUNCTION

摘要

PROBLEM TO BE SOLVED: To correct sensitivity directivity of an illuminance sensor in such a manner that uniform sensitivity characteristic is obtained on a desk surface, without printing or sticking printed matter on a protective cover. SOLUTION: A plane type substrate 10 is provided with a transmittance adjusting part 20 constituted of at least one protruding part 21 or recessed part 22 which are in a unified body with the substrate 10, thereby forming the sensitivity directivity correcting plate 1 of an illuminance sensor which is provided with the protective cover 102 and subjected to adjustment of optical transmittance. The adjusting part 20 may be composed of the protruding part 21 whose section is, e.g. almost semi-spherical or composed of a plurality of the protruding parts 21 or the recessed parts 22 which are conical or pyramidal or in a circular turncated corn type or in a pyramidal turncated corn type. The correcting plate 1 is set between the illuminance sensor 101 and a surface 110 to be irradiated, thereby providing the luminaire with the brightness adjusting function which is equipped with the illuminance sensor 101.