A received light quantity detection device where high-sensitivity pixels and low-sensitivity pixels are formed is used for photometry. In the transmitter, vertical BJTs implemented by a standard triplex well CMOS process are used in a frequency up-mixer and a baseband analog circuit including a DAC, an LPF, a VGA and a PGA, thereby improving the overall performance of the transmitter. A circumferential seal is then applied around the inner tube, and an outer tube is placed around the inner tube and the seal. Next, C units of point sequence data in 3\xd7Mu\xd7Mv dimensions are least squares approximated for the parameters w, and Mw control points in 3\xd7Mu\xd7Mv dimensions are found.