Hamamatsu Photonics KK engages in the manufacture and sale of imaging and analyzing systems, photomultiplier tubes, imaging devices, light sources, and opto-semiconductors. It operates through the following segments: Electron Tube, Opto-semiconductor, Imaging and Measurement Instruments, and Others. The Electron Tube segment produces photomultiplier tubes, light sources, and imaging devices. The Opto-semiconductor segment offers optical semiconductor devices. The Imaging and Measurement Instruments segment deals with image processing and measurement systems. The Others segment includes semiconductor lasers and hotel businesses. The company was founded by Heihachiro Horiuchi in September 1948 and is headquartered in Hamamatsu, Japan.