Sony may provide Apple with image sensors for both the front and rear cameras in a future iPhone, according to a new report from Japanese business site Nikkei, which suggests that Apple and Sony are in negotiations that would double Sony's shipments to the Cupertino company in 2015.The Japanese firm already supplies nearly all of the CMOS (complementary metal-oxide semiconductor) sensors for the current iPhone models' rear-mounted main cameras. Apple is likely looking to switch to Sony sensors for the secondary camera on the screen side, used for taking self-portraits.Sony recently purchased a new manufacturing plant, reportedly aimed at stepping up production in order to comply with Apple's request for more sensors.