| 摘要 |
Xerographic copying apparatus includes an optical system for forming an optical image of an object to be copied on an electrically charged photoconductive surface, the optical image forming a corresponding electrostatic latent image on the surface, and means to develop the latent image with a particulate toner material. At least part of the optical system is housed in a substantially closed compartment, and imaging rays are directed out of the compartment in a generally horizontal direction through a substantially vertical transparent window in the compartment. A blower is provided to blow a curtain of air generally downwardly over the surface of the window outside the compartment, and to blow air into the optics compartment so as to cause a net outflow of air from the optics compartment. |
