Beam shaping optical system
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorJunji Kamikubo
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Abstract
Disclosed is a multi-beam optical system, which has a light source having a plurality of light emitting portions from which a plurality of light beams are emitted, respectively; a collimating lens which collimates the plurality of light beams into a plurality of parallel light beams; a beam shaping optical system including at least one wedge prism, the beam shaping optical system shaping cross section of the plurality of parallel beams; an image forming optical system which converges the plurality of parallel beams transmitted through the beam shaping optical system. In such a multi-beam optical system, a plurality of light emitting portions are aligned in a direction perpendicular to a principal section of the wedge prism.
Claims3
A beam shaping optical system, comprising a first and a second wedge prism, principal sections of said first and second wedge prisms being parallel with each other, wherein when a reference ray is incident on said first wedge prism and a skew ray, which has a same incident angle as said reference ray if projected on said principal section and inclined by an angle V with respect to said reference ray in a plane perpendicular to said principal section, a condition:
- |θ8−θ′8|<0.100°
- is satisfied,
- where, θ8 is an emission angle of said reference ray emitted from said second wedge prism in said principal section, and θ′8 is an emission angle of said skew ray emitted from said second wedge prism projected on said principal section, and |V|<10°.
Dependencies are inferred from the claim text.