Olympus and ex-executives plead guilty to fraud charges
The scandal was exposed last October by CEO Michael Woodford, who was sacked by the Olympus board after querying dubious deals later found to have been used to conceal the losses.
Revelations of the fraud revived calls for more outside scrutiny of its boardrooms but have failed to trigger sweeping corporate governance reforms similar to those introduced a decade ago in the wake of US scandals such as at Enron.