| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To confirm an accurate illuminance even when an influence exists for the luminance due to outdoor daylight, etc., and to improve user-friendliness by operating with high precision according to the surrounding environment by automatically switching a range of an amplifier circuit in a lighting equipment. <P>SOLUTION: The lighting system 10 is provided with a lighting loading part 1, an illuminance sensor part 2 with the amplifier circuit part 2b, a control part 3, a storing part 4 and an operating part 5 operated by a user. A signal detecting the illuminance is amplified by using one range of a plurality of measuring ranges in the amplifier circuit 2b and inputted to the control part 3 in the illuminance sensor part 2. When an operating instruction is made using the operating part 5 by the user to carry out an illuminance display function, an illuminance measuring means 3b of the control part 3 calculates the illuminance by using the inputted signal. At this time, when the illuminance exceeds the measuring possible region in the range which is in use, the illuminance measuring means 3b makes the illuminance able to be calculated by switching to a range with a wider measuring possible region. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
