Patent ID: 7889221
Filing Date: 2011-02-15
Classification: G03G

Abstract:
1. An optical scanning apparatus that forms a latent image by scanning a laser beam emitted from a light source on an image bearing member, the apparatus comprising: first and second laser beam detectors configured to detect the laser beam; and a calculator configured to calculate a slope of a scanning line on the image bearing member on the basis of a result of detection obtained by the first and second laser beam detectors, wherein the first laser beam detector detects the laser beam in a scanning area in front of an area in which the latent image is formed on the image bearing member and the second laser beam detector detects the laser beam in a scanning area behind the area in which the latent image is formed on the image bearing member, wherein the slope θ of the scanning line on the image bearing member is calculated by the calculator as follows: where T is a time from when the laser beam is incident on the first laser-beam detector to when the laser beam is incident on the second laser-beam detector, T