In a bid to grab a bigger piece of the $9 billion market for mobile phone cameras, Tessera Technologies’ DigitalOptics Corp. (DOC) of San Jose, Calif., will acquire the China-based camera module manufacturing brand and assets of Flextronics International Ltd. of Singapore for $23 million in cash. The deal will allow DOC to significantly increase its imaging technology sales by making about 50 million camera modules a year, with the goal of becoming profitable by 2013.