| 摘要 |
A collimator simple in construction, easy to produce and free from parallax. The collimator comprises, sequentially from a target object side, a meniscus lens having a positive refractive power with its convex surface facing the target object, and another meniscus lens having a negative refractive power with its convex surface facing the target object, wherein the surface, on the side opposite to the target object, of the meniscus lens having a positive refractive power or the surface, on the side of the target object, of the meniscus lens having a negative refractive power serves as a translucent reflection surface or a wavelength selecting reflection surface, and a point light source is disposed at the focal point position of a reflection/refraction optical system consisting of the above translucent reflection surface or the wavelength selecting reflection surface and the refractive surface, on the side opposite to the target object, of the meniscus lens having a negative refractive power with its convex surface facing the target object. |
