Perpendicularity measuring method and device

Abstract

The embodiment of the invention discloses a perpendicularity measuring method and device. The perpendicularity measuring method comprises: providing an optical autocollimator and a plane mirror; arranging the plane mirror on an objective table, reflecting a collimated beam by the plane mirror to form a light spot, and recording an initial imaging position of the light spot; enabling a base and a mirror frame to be in a screw joint relationship, arranging the base and the mirror frame on the objective table, and arranging the plane mirror on the mirror frame; rotating the mirror frame at leastthree times and recording a measurement imaging position of the light spot after rotation each time; according to the measurement imaging positions, acquiring a virtual imaging position reflected by the surface of the base; and calculating the perpendicularity of the respective thread axes of the base and the mirror frame and a bearing surface according to the e initial imaging position, the measurement imaging positions, the virtual imaging position, and a conversion relationship between a unit distance and a plane inclination angle on a scale dividing plate. According to the invention, the perpendicularity of the respective thread axes of the base and the mirror frame and the bearing surface can be measured and calculated simultaneously, so that the measurement efficiency of the perpendicularity is improved; and the calculation accuracy of the perpendicularity is ensured.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of optical instrument detection, and in particular to a method and device for measuring perpendicularity. Background technique [0002] Currently in the field of cameras, the lens is generally connected to the camera through a base, so that the imaging surface of the lens and the image sensor of the camera overlap. Specifically, the lens is composed of a frame and a lens installed in the frame. The frame and the base are respectively provided with external threads and internal threads. , to resist each other when screwing. Obviously, whether the axis of the thread is perpendicular to the bearing surface determines whether the final imaging surface of the lens in the frame is parallel or even coincides with the plane where the image sensor in the camera is located. [0003] With the improvement of the imaging quality of the lens and the increase of the aperture, the depth of focus of t...

AI Technical Summary

Problems solved by technology

Existing measurement methods usually require high-precision fixtures to ensure accuracy, and there are few measurement methods that can remove the errors of the fixture itself

Moreover, the current perpendicularity measurement can only measure the perpendicularity of the thread axis of the base and the bearing surface, while ignoring the perpendicularity measurement of the thread axis of the frame and the bearing surface

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