| 摘要 |
PROBLEM TO BE SOLVED: To provide a light-plane projector and a lens capable of imparting improved visibility in the distal portion of a light line projected onto a wall or a reference object. SOLUTION: A non-cylindrically surfaced lens converts a collimated light beam into a light plane that increases a light intensity toward distal portions of the light plane's arc so as to substantially uniformly project a reference light line onto a reference surface onto which the light plane is projected. The non-cylindrically surfaced lens has first and second surfaces that remain constant over at least a portion of the z direction length of the lens. The second surface defines a multiple-radius curve in an x, y plane. The lens may be incorporated into a self-leveled optical device that projects a reference light line onto a reference surface at a predetermined angle relative to horizontal. COPYRIGHT: (C)2007,JPO&INPIT
|
