Sony Corp. wants to become the biggest player in Japan's growing Android tablet market by changing the way the devices are used. The Japanese electronics and entertainment giant unveiled its first tablets to the rest of the world Wednesday, diving into the intense race at home and abroad to catch Apple's ipad. Sony will begin selling the Tablets in Japan on Sept. 17 starting at about 45,000 yen ($584). The device is about the size of an iPad but features a wedge-shaped design that makes it easier to hold.