Nintendo of America, Inc. ("Nintendo") faces a new patent infringement lawsuit in the Western District of Washington, regarding the camera lenses included in its Nintendo DSi handheld gaming systems. The lawsuit, filed on May 24, 2011, accuses Nintendo of infringing United States Patent No. 6,888,686, owned by Plaintiffs Milestone Co., Ltd. and Satoshi Do.

Plaintiffs Do and Milestone Co. accuse Nintendo of both directly infringing the '686 patent by "making, using, selling, offering to sell, leasing, importing and/or exporting handheld gaming systems that infringe one or more claims of the '686 patent," and inducing Nintendo's customers to infringe the patent through Nintendo's "sales, advertising, and instructions." The plaintiffs claim that the camera lens system included in the Nintendo DSi "constitutes a material part of the inventions claimed in the '686 patent."