초록 ▼

An anamorphic single lens has its radii in respective directions determined by the transfer efficiency of beams and imaging positions in respective directions, as required by the overall optical scanner. The anamorphic single lens satisfies the following formulae: [Figure] (Formula1) S′S (Formula2)

An anamorphic single lens has its radii in respective directions determined by the transfer efficiency of beams and imaging positions in respective directions, as required by the overall optical scanner. The anamorphic single lens satisfies the following formulae: [Figure] (Formula1) S′S (Formula2) where fm is the focal length of the lens in the direction of beams diverged at a larger angle, TH is the thickness, S is the distance from a light source side principal point position (6) to the light source (5) in the direction of the beams diverged at the larger angle, and S′is the distance from a light source side principal point position (8) to the light source in the direction of beams diverged at a smaller angle.

대표청구항 ▼

An anamorphic single lens having different refractive powers in a first direction of said anamorphic single lens and a second direction of said anamorphic single lens for refracting beams of light from a light source that diverge at a larger divergence angle in the first direction and at a smaller d

An anamorphic single lens having different refractive powers in a first direction of said anamorphic single lens and a second direction of said anamorphic single lens for refracting beams of light from a light source that diverge at a larger divergence angle in the first direction and at a smaller divergence angle in the second direction wherein said anamorphic single lens satisfies the formulae 1 and 2: 0.62, and (Formula 1) S′2) where fm is the focal length of said anamorphic single lens in the first direction, TH is the thickness or the lens, S is the distance from the light source side principal point position to the light source in the first direction, and S′is the distance from the light source side principal point position to the light source in the second direction; and wherein said anamorphic single lens has a light source side with a first surface thereon and an outgoing side with a second surface thereon, wherein said first surface is a toric surface having a curvature in the first direction concave in the direction of the light source and a curvature in the second direction convex in the direction of the light source, and wherein said second surface is a toric surface having a curvature in the first direction convex in the direction of the image surface.