PURPOSE: To enable automatic precise calibration of the position of the light- measuring sensor by fitting the sensor movably forward and backward in a guide case provided on the side wall of an integrating sphere and by making a microcomputer control the position thereof.
CONSTITUTION: The guide case is provided continuously on the side wall of the integrating sphere, the light-measuring sensor is provided in the case in such a manner that it can be moved forward and backward in the direction of the center of the aforesaid integrating sphere, and further the sensor is made to be positioned by a motor fitted to a forward-backward moving mechanism and operated by data inputted in the microcomputer. For instance, the light-measuring sensor 15 is fitted on a sliding plate 14 provided in the guide case 10 which is fixed on the side wall of the integrating sphere by a flange 11, a forward- backward motion shaft 17 with a rack 18 cut is fitted to the aforesaid sliding plate, and the positioning is made by the motor 20 controlled by the computer. Thereby the position of the optical sensor can be calibrated automatically and precisely according to the sort and type of a lamp.
YAMADA HIROSHI
SATOU MASAICHI
