Patent ID: 6597512
Filing Date: 2003-07-22
Classification: G02B

Abstract:
A rod lens array for line scanning comprising:a plurality of rod lenses having a refractive index distribution in a radial direction that are arranged in one row in a main scanning direction with their optical axes in parallel, wherein an overlapping degree m is in a range defined by (1.55+0.5j) D/d&lE;m&lE;(1.80+0.5j) D/dâ€ƒâ€ƒEq. 1 â€ƒwhere d is a lens diameter of the rod lenses, D is an array pitch of the rod lenses and j is zero or a positive integer, and the overlapping degree m is given by m=X0/d, where X0 is an image radius that a single rod lens projects onto an image plane.