Laser range finder

Abstract

The invention relates to a laser range finder. The laser range finder comprises an emission optical system. The emission optical system comprises a collimator. An emission light path on which the collimator is arranged is provided with a first refraction plate used for generating an inner light path so as to realize sampling, and an inner light path optical fiber used for receiving the inner light path. An inner and outer light path switching device is arranged between the emission light path and the inner light path. The inner and outer light path switching device blocks the emission light path and conducts the inner light path, so that the purpose of inner light path measuring is achieved; when the inner light path is blocked, the emission light path is conducted, so that the purpose of outer light path measuring is realized. By adopting the structure, the negative influences of axial endplay of an inner light path motor shaft to measuring precision in the prior art are avoided.

Description

technical field [0001] The invention relates to a laser range finder. Background technique [0002] The basic mechanism of a laser distance measuring device is already known. For example: Chinese patent document announcement number CN201203670Y discloses a kind of emission optical system in the laser rangefinder including: diaphragm 2, laser and collimator 1 located at the light output end of laser; The diaphragm 2 moves into or out of the emission beam path 21 of the emission optics. The inner optical path switching device 4 for refracting light is provided on the emitting optical path 21 at the front end of the collimator 1, and an inner optical path optical fiber 5 for receiving the refracted light is provided on one side of the inner optical path switching device 4; The optical path switching device 4 includes: an inner optical path motor 4-1 and a refracting prism 4-2 fixedly connected to the rotating shaft of the inner optical path motor 4-1; the light incident end s...

AI Technical Summary

Problems solved by technology

[0006] 3. The end face of the optical fiber is fixed on the focal point of the optical system. When measuring at close distances, the focal position moves backward due to the imaging of the optical system, and the light-receiving surface of the optical fiber needs to be increased. Otherwise, the energy received into the receiving optical fiber will decrease, resulting in measurement The error increases; the light-receiving surface of the optical fiber cannot be increased infinitely, and the larger the light-receiving surface, the greater the external light noise, and the measurement error will increase; at the same time, the thicker the optical fiber is, the harder it is, and the worse the manufacturing process is.

Images