MULTI-BEAM RECORDER

摘要

PURPOSE: To provide a multi-beam recorder capable of regulating a focusing position by a small-sized moving mechanism. CONSTITUTION: A contraction projection lens 20 for focusing the luminous flux from a light source 10 on a photosensitive member P has a positive first lens group 21 for collimating luminous fluxes from the source 10 side and a positive second lens group 22 for converging the fluxes collimated by the group 21. Regulating means for holding the focused state of the lens 20 to the member P by moving only the group 22 in an optical axis direction is provided.