By Reiji Murai and Sophie Knight TOKYO (Reuters) – Sony Corp may buy a Japanese factory from chipmaker Renesas Electronics Corp to boost production of its imaging sensors as demand rises from smartphone makers, sources told Reuters on Wednesday. Imaging sensors have been a rare success for Sony, which has come to dominate the CMOS sector, claiming a third of the market in 2012 according to research firm Techno Systems Research. Sonys CEO, Kazuo Hirai, has identified the sensors as one of the pillars of his companys revival. The global CMOS sensor market is forecast to grow 60 percent over the next five years to 2017 to $12.28 billion, according to Techno Systems Research, as demand for smartphones continues to expand, particularly in China.