| 摘要 |
PROBLEM TO BE SOLVED: To highly accurately detect only a component of a light to be detected by eliminating influences of a flare light. SOLUTION: When a flare light PF enters phtodetecting elements 12A-12D, the flare light PF influences the periphery of the photodetecting elements 12A-12D as well, different from a condensed light PS to be detected. Therefore, dummy photodetecting elements 13A-13D are arranged in the vicinity of the photodetecting elements 12A-12D. If a component of the flare light detected by the dummy photodetecting elements 13A-13D is made equivalent to that detected by the photodetecting elements 12A-12D, the component of the flare light detected by the photodetecting elements 12A-12D can be eliminated with the use of the component of the flare light detected and output from the dummy photodetecting elements 13A-13D. |
