| 摘要 |
PURPOSE:To adjust the intensity distribution of luminous flux with simple, small-sized constitution by adjusting an angle of divergence through the 1st optical element which is different in refracting power between a horizontal and a vertical direction and the 2nd optical element which has refracting power at least in one direction. CONSTITUTION:The 1st optical element I has horizontal and vertical refracting power values phi1H and phi1V and the 2nd optical element II has refracting power values phi2H and phi2V and is asymmetric optically and rotationally; and the both are equal in back focus even if the vertical and horizontal focal lengths are different as long as an equation holds, where e' is the air conversion gap between the elements and alpha is a proportional constant. Both elements have toric surfaces, the optical member 10 composed of the 1st and the 2nd elements has radii R1H and R2H of horizontal curvature and radii R1V and R2X of vertical curvature, and pieces of luminous flux of a semiconductor laser 1 in the horizontal and vertical directions have angles thetaH and thetaV of divergence. For the purpose, the refracting power N of the optical member 10 is set properly in the horizontal and vertical directions and the intensity distribution of luminous flux is adjusted into an optional shape even when a light source having a different angle of divergence is used.
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