TOKYO, June 29 (Reuters) - Japan's Sony Corp said on Wednesday it expects its image sensor business will miss its revenue target for the 2017 fiscal year because of weakening global demand for smartphones.

Sony forecast a revenue range of 1 trillion-1.05 trillion yen ($9.76 billion-$10.25 billion) for the year starting April 2017 in its revised medium-term business plan for the devices unit, which includes image sensors. That was lower than the previous target of 1.3 trillion-1.5 trillion yen.

($1 = 102.4200 yen) (Reporting by Makiko Yamazaki)