JP2009103816A5 - - Google Patents

Claims (6)

A plurality of light emitting points each emitting a laser beam, and a plurality of light sources arranged side by side in the sub-scanning direction;
A deflection unit having a reflecting surface on which the plurality of light sources or RaIzuru Isa a plurality of laser light enters through the optical element,
With
A plurality of laser beams Isa RaIzuru or the plurality of light sources is incident on the same reflecting surface of the deflection means, said sub-scanning direction between the plurality of laser beams toward the reflective surface from said plurality of light sources as narrowed, the plurality of laser light is obliquely incident on the sub-scanning direction with respect to the direction perpendicular to the reflecting surface, corresponding respectively to the laser beam deflected by said deflecting means to said plurality of light sources In an optical scanning device that scans a plurality of image carriers,
Wherein the plurality of the plurality of laser beams emitted from the light source is incident, comprising an aperture stop member having a plurality corresponding openings for limiting a light flux of the plurality of laser beams to the plurality of light sources,
The aperture stop member, between said deflecting means and the optical element, one 且 for one opening of the plurality of the openings, except the light source corresponding to the opening portion of the plurality of light sources An optical scanning device is provided at a position where laser light emitted from the light source cannot pass. For two light sources which are arranged side by side along the sub-scanning direction among the plurality of light sources, a plurality of laser beams emitted from the two light sources, when viewed from the main scanning direction, perpendicular to the reflecting surface at an incident angle of the angle θ for the direction in which, respectively incident on the same reflecting surface of the deflection means, and a plurality of laser beams emitted from the two light sources, in the sub-scanning direction on the same reflective surface It is provided so that the position is imaged at the same position,
The opening diameter in the sub-scanning direction of the two openings corresponding to the two light sources is a, the length in the sub-scanning direction of the connecting portion between the two openings is b, the same reflecting surface, the aperture stop member, If the length between is L,
L ≧ (a + b) / 2 tan θ
The optical scanning device according to claim 1, wherein: Surface facing the front Symbol plurality of light sources of the aperture stop member, the laser beam reflected by the opposing surface does not pass through a plurality of the openings of the plurality of laser beams emitted from said plurality of light sources the the optical scanning apparatus according to claim 1 or 2, characterized in that it has a I傾 oblique such incident on a plurality of light sources. The plurality of light sources are two light sources arranged side by side along the sub-scanning direction,
3. The optical scanning device according to claim 1, wherein opposed surfaces of the aperture stop member facing the plurality of light sources are inclined with respect to a main scanning direction when viewed from the sub-scanning direction. An optical box for holding the deflecting means;
The optical scanning device according to claim 1, wherein the aperture stop member is formed integrally with the optical box. The optical scanning device according to claim 1, wherein the optical element is a cylindrical lens.