| 摘要 |
A corrector lens for use in a distance determining system employing a plurality of detector elements arranged in pairs and mounted proximate a plurality of lenslets. Each lenslet creates an image of the exit pupil of the objective lens of the system and when the objective lens is properly positioned, each of the detectors of each pair receives approximately the same amount of radiation. The corrector lens operates to direct radiation from the objective lens to the lenslets so that each lenslet receives radiation generally along its optic axis rather than at an angle thereto so that the radiation detectors may be mounted approximately equal distant on opposite sides of the axis and thus receive radiation from the lenslets along substantially equal paths. |
