OPTICAL DISTANCE MEASURING DEVICE

摘要

An electric distance meter is downsized by using a condensing optical member having a small outer diameter (effective diameter) as a condensing optical member in a light-receiving optical system of reflection light from an object, reducing a focal length of the condensing optical member without reducing a spread angle to a light-receiving optical fiber and reducing a diameter of the light-receiving optical fiber. An optical distance meter 10 emits outgoing light E from a light source 15 to an object, and receives reflection light R from the object by a light receiver 22, so as to perform distance measurement. The optical distance meter 10 includes an emitting optical system which irradiates the object by the emission light E via an objective lens 26 and a light-receiving optical system which guides the reflection light R via the objective lens 26 to the light receiver 22, and a cone prism 34 which changes a cross-section shape of a light beam without generating a transmission deflection angle is provided on an optical axis of the light-receiving optical system or an optical axis of the emission optical system.