Optical beam scanner

An optical beam scanner of the type including a first image-forming optical system arranged to form an image of a light beam from a light source linearly on or in the vicinity of a reflective deflection surface of a deflector, and a second image-forming optical system arranged to form an image of the deflected light beam from said deflector on a scanning surface;

• characterized in that said second image-forming optical system comprises successively from the side of said deflector:
• a first singular lens element in the form of a positive meniscus, wherein in a first cross-section of the first singular lens element taken in a plane extending parallel to a main scan direction of said light beam, the first cross-section of the first singular lens element has a convex curve facing the scanning surface, and wherein in a second cross-section of the first singular lens element taken in a plane extending parallel to a subscan direction which is perpendicular to said main scan direction, the second cross-section of the first singular lens element has a convex curve facing said scanning surface, and wherein said first singular lens element has a toric surface at least one the side facing the deflector;
• a second singular lens element in the form of a negative meniscus, wherein in a first cross-section of the second singular lens element taken in a plane extending parallel to the main scan direction, the first cross-section of the second singular lens element has a convex curve facing said scanning surface and a concave curve facing said deflector, and wherein in a second cross-section of the second singular lens element taken in a plane ext ending parallel to said subscan direction, the second cross-section of the second singular lens element has either a convex curve or a straight line facing said scanning surface and either a concave curve or straight line facing said deflector.