The name comes from a sponsorship deal, reported to be worth £10 million[SUP][8][/SUP] over 10 years. Ricoh's sponsorship of the new stadium was confirmed on 26 April 2005
Runs till 2025 now, IIRC it was stated by ACL (PWKH?) that Ricoh weren't really that bothered if there was a football team there or not. Guess that's true else they wouldn't have renewed.