Light scanning apparatus and image forming apparatus including light scanning apparatus

摘要

A resin BD lens having a property of refracting a light beam in a direction corresponding to a main scanning direction may cause a variation in generation timing difference among a plurality of horizontal synchronization signals and accordingly degrade accuracy to correct the starting position of an electrostatic latent image. The present invention uses a glass BD lens having a property of refracting a light beam in a direction corresponding to the main scanning direction.

主权项

1. A light scanning apparatus including a light source including a plurality of light emitting elements arranged therein such that each of light beams from the plurality of light emitting elements exposes a different position on a rotary-driven photosensitive member in a rotational direction of the photosensitive member, emission timings of the plurality of light beams from the plurality of light emitting elements being controlled on a basis of a synchronization signal, the light scanning apparatus comprising:
a deflection unit configured to deflect a plurality of light beams such that the plurality of light beams scans the photosensitive member; a light receiving element that receives the light beam deflected by the deflection unit and generates the synchronization signal based on the reception of the light beam deflected by the deflection unit; a first lens configured to guide the plurality of light beams deflected by the deflection unit onto the photosensitive member; and a second lens made of glass disposed on an optical path of the light beam deflected by the deflection unit and guiding the light beam deflected by the deflection unit onto the light receiving element, wherein the second lens focuses the light beam deflected by the deflection unit in a direction corresponding to a scanning direction of the plurality of the light beams, and wherein the light beam which has passed through the second lens does not expose the photosensitive member.