LIGHT SCANNING APPARATUS AND IMAGE FORMING APPARATUS USING THE SAME

摘要

A light scanning apparatus includes a light source, a deflector configured to deflect a light flux from the light source, and an imaging optical system configured to guide the light flux deflected at the deflector onto a scanned surface. The imaging optical system consists of a single imaging optical element, wherein, on the optical axis of the imaging optical system, the conditions 0.15≦T2/Sk≦0.3 and 0.03≦d/K≦0.08 are satisfied. A condition 0.3≦B≦0.6 is satisfied at a condensing position Y where a scanning angle θ is greatest, when the condensing position Y in the main scanning direction on the scanned surface of the light flux deflected at the scanning angle θ by the deflector is expressed by Y=(K/B)×tan(B×θ).

主权项

1. A light scanning apparatus comprising:
a light source; a deflector configured to deflect a light flux from the light source; and an imaging optical system configured to guide the light flux deflected at the deflector onto a scanned surface; wherein the imaging optical system consists of a single imaging optical element; wherein, on the optical axis of the imaging optical system, the following conditions are satisfied
0.15≦T2/Sk≦0.30.03≦d/K≦0.08where T2 represents the distance from a deflecting surface of the deflector to an exit surface of the imaging optical element, Sk represents the distance from the exit surface of the imaging optical element to the scanned surface, d represents the thickness of the imaging optical element, and K represents an imaging coefficient of the imaging optical element,
and wherein the condition
0.3≦B≦0.6 is satisfied at a condensing position Y where a scanning angle θ is greatest, when the condensing position Y in the main scanning direction on the scanned surface of the light flux deflected at the scanning angle θ by the deflector is expressed by
Y=(K/B)×tan(B×θ)where B is a scanning properties coefficient.