UK tech firm ARM has acquired imaging technology company Apical for 350 million US dollars (£240 million). ARM, which is best known for supplying Apple, said the deal will allow it to expand further into next generation technology products. Apical is one of the UK's fastest growing tech firms and its imaging products are used in more than 1.5 billion smartphones and around 300 million other consumer devices such as cameras and tablets. Founded in 2002, Apical employs around 100 staff, mainly at a research and development centre in Loughborough.