| 摘要 |
PURPOSE:To attain color correction without addition of an optical member by providing a 1st optical member receiving a light beam from its 1st face and radiating the light from its 2nd face and a 2nd optical member having a 3rd face arranged opposite to the 2nd face of the 1st optical member and set to an Abbe number different from that of the 1st optical member. CONSTITUTION:One side of a 1st optical member 7 and a bottom of a 2nd optical member 9 are integrated such that the length of the side and the bottom is made almost same and the side and the bottom are opposite to each other. Moreover, a collimated laser beam from a collimator lens 5 is made incident from a bottom of a 1st face 7a including other side of the 1st optical member 7 and radiates to a 1/4 wavelength plate 11 from a 4th face 9b of the 2nd optical member 9 via a contact face 7b between the 1st optical member 7 and the 2nd optical member 9 in the direction of a normal of the 4th face 9b. In this case, since the Abbe number of the 1st optical member and that of the 2nd optical member differ from each other, the correction to the dispersion in the light beam is applied. Thus, color correction is implemented without adding any optical member. |
