Patent ID: 7277113
Filing Date: 2007-10-02
Classification: G02B,G06K

Abstract:
1. An image forming apparatus in which a light intensity of a light beam used in latent image formation is switched in response to a change in resolution, comprising: a light emission unit that emits a light beam in order to form a latent image on a photosensitive drum; a scanning unit that scans the emitted light beam; a detection unit that detects the scanned light beam; a selection unit that selects a light emission timing according to the intensity of the light beam or the resolution when controlling a light emission timing of the light emission unit in response to a detection timing of the detected light beam, wherein the selection unit includes a light emission timing determination unit that determines the light emission timing using as a reference a dividing point that divides a pulse width of a signal output from the detection unit into predetermined proportions; and a control unit that controls the light emission timing of to light emission unit in accordance with the selected light emission timing, wherein the dividing point is determined based on a ratio between an amount of deviation in pulse rise time from said detection unit and an amount of deviation in pulse falling time of the output signal.