Beam shaping optical system

Abstract

Abstract PURPOSE:To obtain a parallel beam shaping optical system which has a short overall length and is easy to produce, by arranging the first plano-concave cylindrical lens, the second plano-concave cylindrical lens, and a plano-convex cylindrical lens having the convex directed to the exit side in order from the incidence side and directing one concave to the exit side at least. CONSTITUTION:One face of each of three cylindrical lenses is made plane, and cylinder alignment is not performed at a lens working time, and generation of aberrations is held down to a minimum by adjustment for lens assembling. Since the height of entrance to a negative lens is lower than that to a position lens, the power is made higher to increase the generation quantity of aberrations if only one plano-concave cylindrical lens is used; and therefore, two plano-concave cylindrical lenses are used to distributed the power, and thereby, generation of aberrations is held down. One of two concaves is directed to the exit side at least. If two concaves are directed to the incidence side together, negative wavefront aberration generated on concaves is too small to compensate.

Inventors

• 👤 Koichi Maruyama
• 👤 晃一 丸山

Bibliographic Details