IMAGING OPTICAL DEVICE, IN PARTICULAR BINOCULARS OR TELESCOPE

摘要

PROBLEM TO BE SOLVED: To provide an imaging optical device capable of automatically reading the distance from an observed object to a user after being put in focus on the observed object. SOLUTION: Binoculars 1 or a telescope have an optical system equipped with at least two optical elements in addition to a casing 2. Their relative distance is adjustable for setting the focus of the optical system. This adjustment is made by an adjusting device coupled with at least one of the two elements. Relative positions of the optical elements are detected and converted into the focal length of the optical system by using a processor and then outputted as the focal length through an output device 17. COPYRIGHT: (C)2005,JPO&NCIPI