| 摘要 |
PURPOSE:To enable the constitution of a very small one-dimensional lens and the easy adjustment of a focal length, by polishing and finishing at least one side surface of a transparent circular cylindrical body of which the refractive index decreases parabolically from the central axis toward the periphery and is uniform in the axial direction to a plane parallel with the central axis. CONSTITUTION:Both side surfaces of an optical transmission body 1 of which the refractive index decreases parabolically from a central axis 2 toward the periphery and is uniform in the direction of the axis 2 are polished and finished to the planes 4A, 4B in parallel with the axis 2, whereby an incident face and an exit face for light are formed. Such one-dimensional lens 4 can be constituted in a very small size. The parallel rays made incident to the lens 4 from the face 4A emit from the face 4B and focus on a caustic curve 5. The focal length is easily adjusted simply by changing thickness W. |
