Optical scanning device image forming apparatus and optical scanning method Grant US-6847472-B2 United States of America 25 Jan 2005
Optical scanning device, image forming apparatus and optical scanning method Grant US-6697181-B2 United States of America 24 Feb 2004
Optical scanning device, image forming apparatus and optical scanning method Grant US-6384949-B1 United States of America 07 May 2002