参考文献:
Anderson, Kevin William Fotouhi, Nader Gillespie, Paul Goodnow, Robert Alan Guertin, Kevin Richard Haynes, Nancy-Ellen Myers, Michael Paul Pietranico-Cole, Sherrie Lynn Qi, Lida Rossman, Pamela Loreen Scott, Nathan Robert Thakkar, Kshitij Chhabilbhai Tilley, Jefferson Wright Zhang, Qiang Patent: US007/580 A, 007 Location in patent: Page/Page column 5 US 0070580 A