| 摘要 |
PURPOSE:To improve the automatic focusing distance measuring performance by placing an automatic focusing lens system in a reflected luminous flux from a mirror, and eliminating the eccentric shift from an optical axis of a photographic optical system and an automatic focusing lens optical system. CONSTITUTION:In order to fetch a part of a luminous flux in an optical path of a photographic optical system, to the outside of the photographic optical system, a mirror 1 whose height center is in a position shifted from an optical axis of the photographic optical system is provided, and an automatic focusing lens system is placed in a reflected luminous flux from the mirror 1. A focusing luminous flux is made parallel to the optical axis of the photographic optical system by a mirror 2, and the eccentric shift is eliminated from the optical axis of the photographic optical system and the automatic focusing lens system. Therefore, an image deterioration on an automatic focusing photodetecting surface 3 can be reduced. Especially, when using a TCL module for a photodetector of the automatic focusing optical system, the shift of the center of gravity of energy of a spot which the respective luminous fluxes which has divided an entrance pupil to the photodetector into two forms on the photodetecting surface can be reduced, and the automatic focusing distance measuring performance can be improved. |
