| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact photodetector for constituting a light-tracking sensor without having an error caused by deviation in optical axis. SOLUTION: A photodetector 10 is constituted mainly of a semiconductor substrate 12, where a quartered photodiode is formed at the center part of a device generating surface 12a and at the same time a photodiode array is formed around the periphery and a wiring board 18 for electrically connecting the semiconductor substrate 12 to the outside. In this case, the semiconductor substrate 12 is connected electrically and mechanically to the wiring board 18 by a bump 20, so that the device generating surface 12a faces opposite to the wiring board 18. On the wiring board 18, a signal-processing circuit is constituted with a preamplifier and a signal selection circuit. |
