Patent ID: 7158163
Filing Date: 2007-01-02
Classification: B41J

Abstract:
1. A light beam scanning apparatus comprising: light emission means for emitting a light beam; light amount detection means for detecting a light amount of the light beam emitted by the light emission means; reflection means for reflecting the light beam to scan the light beam emitted by the light emission means; rotation means for rotating the reflection means to scan the light beam emitted by the light emission means; rotation control means for controlling rotation of the rotation means; rotational speed detection means for detecting that a rotational speed of the rotation means has reached a predetermined rotational speed; light amount control means for, before the rotational speed detection means detects that the rotational speed has reached the predetermined rotational speed, controlling light emission of the light beam by the light emission means at an ON/OFF timing of auto power control on the basis of a count of an image clock synchronized with a horizontal sync signal and controlling the light amount of the light beam emitted by the light emission means to a predetermined value on the basis of a light amount detection result detected by the light amount detection means in correspondence with the light emission; bias current control means for, before the ON timing of the auto power control, controlling ON/OFF of a bias current supplied to the light emission means at the ON/OFF timing of the bias current on the basis of the count of the image clock synchronized with the horizontal sync signal; and light emission control means for, after the rotational speed detection means detects that the rotational speed has reached the predetermined rotational speed, controlling a light emission timing of the light beam by the light emission means on the basis of horizontal sync signal synchronized with the image clock.