| 摘要 |
PURPOSE:To diverge light efficiently over a wide range by arranging plural small-diameter cylindrical lenses successively and making a light beam incident on the surface formd of those cylindrical lenses. CONSTITUTION:The extremely thin cylindrical lenses 11 are provided on a base 13 which has a hole part 12 bored in the center without any gap. The light beam L projected by a laser light source 14 is projected upon the cylindrical lenses 11 and becomes sectorial light L'. Center axes of the cylindrical lenses 11 are all on the same plane and the beam L is incident on the plane at right angles. Further, the axes of the cylindrical lenses 11 are parallel to one another, so the sectional light which is expanded by each cylindrical lens 11 is on the same plane.
|
