参考文献

Ricoh Company, Ltd.; GOTO, Daisuke; YAMAMOTO, Satoshi; SAGISAKA, Toshiya; KATO, Takuji; OKADA, Takashi; SHINODA, Masato; MATSUMOTO, Shinji; MOHRI, Masataka; YUTANI, Keiichiro Patent: WO2011/30918 A1, 2011 ; Location in patent: Page/Page column 101-103 ;