| 摘要 |
<p>The laser beam (2), once spread radially by a convex reflector (4) or by a concave lens, is made to converge linearly by means of a cylindrical-concave reflector (5). The line of light L obtained on an object is a constant and non-flickering one, unlike that obtained by a conventional apparatus which reflects a laser beam by means of a rapidly rotating polygonal-prismatic mirror to give an apparent line of light on an object. Various patterns of lines are obtainable by making the cylindrical-concave reflector (5) have a plurality of cylindrical-concave reflective surfaces curved about different axes. A line on a curved surface is produced by variation of the curvature of the concave reflector along the axis of curvature.</p> |
