Patent ID: 7075563

Claim:
A multi-beam laser scanning device, comprising: a light emitting source that generates at least three laser beams; a rotating deflector that has a plurality of deflecting surfaces, the rotating deflector, while rotating, deflecting the laser beams at each of the deflecting surfaces to make the laser beams scan in a first direction; and a scanning surface on which at least three light spots of the laser beams deflected by the rotating deflector are formed along a second direction, the light spots moving in the first direction and forming at least three scanning lines, wherein a first group of at least three scanning lines generated by deflection on a first deflecting surface of the rotating deflector are located along the second direction adjacent to a second group of at least three scanning lines generated by deflection on a second deflecting surface next to the first deflecting surface, said first group of at least three scanning lines not interlaced with said second group of at least three scanning lines; and an interval between a scanning line X of the first group and a scanning line Y of the second group, the scanning line X and the scanning line Y being adjacent to one another, satisfies the following equation: Î” P â€²<0.6 Â·Ws where Î”Pâ€² represents a difference between a maximum interval and a minimum interval between the scanning line X and the scanning line Y, and Ws represents a size of one of the light spots in the second direction.