The maker of Cyber-shot cameras will buy back from Toshiba Corp. a factory making chips used in PlayStation 3 game consoles and convert the plant into an image-sensor production facility, Tokyo-based Sony said today in a statement. The company also plans to add equipment to an existing plant in Nagasaki, western Japan, to make high-quality image sensors, it said.

The investment follows a plan by Sony, disclosed in September, to spend 40 billion yen to boost output of so-called CMOS chips at a factory in Kumamoto prefecture. Japan’s biggest exporter of consumer electronics aims to win a 30 percent share of shipments in the market for image sensors used in mobile phones, compared with about 10 percent for the year ending March 2011, Yoko Yasukochi, a Sony spokeswoman, said by phone today.

Sony’s overall capacity for the devices will be lifted to 50,000 units a month by March 2012 from 25,000 currently, according to the statement.

Sony was little changed at 2,960 yen at the 3 p.m. close of trading in Tokyo, compared with a 0.7 percent advance by the benchmark Nikkei 225 Stock Average.