In another blow for Sony, the Playstation 3 was outsold by a 5-to-1 margin in Japan, according to the latest figures from May. The news is even worse for Microsoft, who barely made a dent on the lucrative market.

In the latest step in its electronics operations, Sony said on Wednesday it would spend 60 billion yen over the next three years to boost its capacity to make image sensor chips, which are used in cellphones and digital cameras -- Sony's cash cow.

Sony sold 45,321 units of the PS3 in May, compared with 251,794 units of the Wii. In April, the ratio was four to one in favor of the Wii, according to Japanese game magazine publisher Enterbrain.

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