| 摘要 |
A novel lens arrangement features a first lens which is configured to be fixed to a light source and features an aspherical convex exit surface for transmitting light which received from the light source. A second lens is arranged to the optical axis of the first lens and features an aspherical concave entry surface which is arranged to receive light which transmitted by the first lens and which has substantially the same shape as that of the exit convex surface of the first lens. The first and second lens are configured to be moved along the optical axis in respect to each other between a minimum extended position, wherein the exit surface of the first lens is nested into the matching concave entry surface of the second lens, and maximum extended position, wherein second lens lies at the focal point of the first lens. |
