Patent ID: 6563104
Filing Date: 2003-05-13
Classification: B41J,G02B,H04N

Abstract:
An image forming apparatus which uses an unit magnification imaging rod lens array including a number of rod lenses each having a refractive index distribution in the radial direction and being arrayed such that their optical axes are arranged parallel to one another, and in which an object surface is disposed facing one end face of the rod lens array, while an image surface is disposed facing the other end face thereof, and a lens working distance of the rod lens array on the object side is substantially equal to that on the image side,wherein an actual object-image distance Tco is set between a conjugate length TC1 at which an average value MTFave of MTF of the rod lens array in the lens array direction is maximized and a conjugate length TC2 at which &Dgr;MTF(=(MTFmaxâˆ’MTFmin)/MTFave) is minimized.