Image sensor makers Alps Electric Co Ltd 6770.T and Mitsumi Electric Co Ltd 6767.T fell 2.5 percent and 2 percent, respectively, while electronics and optics company Taiyo Yuden Co Ltd 6976.T was 2.2 percent lower. Precision parts maker Minebea Co Ltd 6479.T slipped 1.8 percent while screen maker Japan Display Inc 6740.T edged down 0.9 percent and Nitto Denko Corp 6988.T fell 1.6 percent. Apple Chief Financial Officer Luca Maestri told Reuters the company was "extremely optimistic" about China, but investors remained wary. "Following the Chinese regulators' decision to shut down the iBook and iTunes movie store despite previous government approval, Apple and its tech peers must be seriously concerned about the feasibility of Chinese market penetration," said Martin King, co-managing director at Tyton Capital Advisors.