Japanese high-tech giant Canon Inc. said Monday that its first quarter net profit more than tripled to over 600 million dollars on-year and raised its profit forecast for 2010. It said stronger demand for its colour laser printers and digital single-lens reflex (SLR) cameras helped net profit surge 220.2 percent on-year to 56.8 billion yen (600 million dollars), from 17.7 billion at the same time last year. It also raised its 2010 net profit forecast to 240 billion yen, which would constitute an 82.3 percent improvement on the previous year. 