Patent ID: 6970294
Filing Date: 2005-11-29
Classification: B23K,G02B

Abstract:
1. A beam-emission-angle compensating optical unit for correcting a beam emission angle, comprising: an optical element formed of a light-transmissive member having a refractive index n, including: wherein the reference axis is defined in an xyz space, the xyz space being defined by x-axis, y-axis, and z-axis that are orthogonal to one another, the x-axis and the y-axis defining an xy plane, the x-axis and the z-axis defining an xz plane, and the y-axis and the z-axis defining a yz plane, the reference axis extending along the x-axis, the incident beam direction being shifted from the x-axis by the angle δ, which defines an angle δyz between the y-axis and an orthogonal projection component of the incident light beam in the yz plane; and wherein the optical element is disposed with its imaginary normal plane being located at a rotational angle φ from the xy plane around the x-axis, the rotational angle φ being equal to the angle δyz to allow the light emitting surface to output the output light beam in the output beam direction that is parallel with the x axis.