| 摘要 |
PURPOSE: To make an ellipticity adjustable without operating the optical chain of the device and to enable an elliptical spot with a larger value of the ratio by incorporating in a conversion chain a cylindrical attachment for a distorted image system. CONSTITUTION: A laser 10 imparts a Gauss beam, while the beam propagates through a conversion chain 11. With this conversion chain 11, a spherical magnifier lens 12 of infinite focal system is assembled, as is a cylindrical attachment 14 for a distorted image system. The magnified beam passes through the attachment 14, with the initial isotropic inclination becoming anisotropic. Accordingly, by actuating against the attachment 14, the ellipticity of an absorbed spot can be adjusted at random. After being away from the attachment 14, the beam hits a scanning device, crossing a convergent optical device 22 transversely, and making a scanning move. The objective lens with a planar visual field in the convergent device 22 enables scanning of wide visibility without causing focus deviation. |
