| 摘要 |
<p>An optical system for laser marking and comprising - when seen in the direction of a light beam of a predetermined transverse measurement (D0) and emitted by a laser (1) - a mask (7) including a mask pattern (8), and an image-producing means (12), such as a lens, and whereby the transverse measurement of the laser beam on the mask (7) is larger than the transverse measurement of the mask pattern. A focusing means (2), such as a lens, and a concave mirror (3) are situated between the laser (1) and the mask (7), whereby the concave mirror (3) being situated with its vertex in the focal point of the focusing means (2) and with the reflecting surface (4) facing the mask (7). An inlet opening (5) is shaped about the vertex, the transverse measurement of said inlet opening being slightly larger than the transverse measurement of the focal point. The mask (7) is shaped as a mirror, preferably a plane mirror, with the reflecting surface (9) facing the concave mirror (3), and the radius of the curvature (R4) of the concave mirror (3) is longer than twice the distance (b) between the mask (7) and the concave mirror (3).</p> |
