Optical system of visibility meter

Abstract

The invention relates to an optical system of a visibility meter, comprising a mounting tube, a light barrier for mounting and fixing a lens is fixed at the mouth of the mounting tube, a light tube for installing and fixing a luminous tube is arranged in the mounting tube, the front end of the light tube is connected to the light barrier Top press fit; a C-shaped expansion ring is provided between the rear end of the light tube and the inner wall of the installation tube, and a mounting bracket that is clearance fit with it and fixed by bolts is provided at the rear end of the light tube. Squeeze the mounting frame to reduce the gap between the mounting frame and the light tube to achieve fastening bolts; the front end of the expansion ring is matched with a collar on the peripheral surface of the light tube to press and limit, and the rear end of the expansion ring has a wide opening As for the truncated cone facing the rear, the mounting frame has a cylindrical part press-fitted with the rear end of the expansion ring, and the front end of the cylindrical part is adapted to the truncated cone surface of the rear end of the expansion ring. The expansion ring squeezes the installation tube to ensure that the light tube will not move axially in the installation tube, that is, the distance between the light-emitting tube and the lens is guaranteed to be constant, and the focal length of the optical system is guaranteed.

Description

technical field [0001] The invention relates to a visibility meter optical system. Background technique [0002] In the optical system of the visibility meter, in order to facilitate installation and debugging, the luminous tube is installed in the light tube, the lens is installed in the light barrier, the light barrier is pressed into the installation tube by a press, and the light tube is also set in the installation tube. The front end of the light barrier is press fit. But there is no fixed device between the light tube and the light barrier, so the light tube will move axially relative to the light barrier, causing the light-emitting tube installed in the light tube to move axially, away from or close to the lens, and the focal length of the system will also be affected , poor consistency with other products. Contents of the invention [0003] The purpose of the present invention is to provide an optical system of a visibility meter to solve the problem that the li...

AI Technical Summary

Problems solved by technology

But there is no fixed device between the light tube and the light barrier, so the light tube will move axially relative to the light barrier, causing the light-emitting tube installed in the light tube to move axially, away from or close to the lens, and the focal length of the system will also be affected , poor consistency with other products

Images