Device for measuring pretightening force of threaded pressing ring of optical lens

Abstract

The invention belongs to the field of small precision instruments, and specifically discloses a device for measuring a pretightening force of a threaded pressing ring of an optical lens. The device mainly comprises a rib plate, a platform, a force transferring rod, a sensor assembly, an adapter plate, a guide cylinder, a translation sliding rail, a lens cone clamping assembly and a vertical moving assembly, and is characterized in that the vertical moving assembly is fixedly connected with the platform, the sensor assembly and the guide cylinder are installed on the adapter plate and then fixedly connected with the translation sliding rail as a whole, and the lens cone clamping assembly is connected to the vertical moving assembly through the an adapter block. The device can perform threaded pressing ring pretightening force measurement in allusion to different models of optical lens under different conditions, and has the characteristics of high flexibility, convenient adjustment, simple operation, high measurement accuracy and the like.

Description

technical field [0001] The invention belongs to the field of small precision instruments, and mainly relates to a device for measuring the pretightening force of an optical lens thread pressure ring. Background technique [0002] With the increasing requirements for the precision and imaging quality of optical lenses, improving the assembly quality of optical lenses has become an urgent issue. The lens and the frame are mostly fixed by a pre-tightened threaded ring, and the mechanical static connection between the lens and the frame is realized through the threaded ring. The connection form of the threaded pressure ring has the characteristics of easy disassembly and firm fastening. The pretightening force of the threaded pressure ring determines the assembly quality of the optical lens to a certain extent. In the optical lens, if the pre-tightening force is too high, it will cause stress concentration, which will cause the image quality of the lens to decrease or even dama...

AI Technical Summary

Problems solved by technology

However, compared with ordinary threads, the lens threaded pressure ring has a smaller ratio of the pitch to the nominal diameter, a smaller ratio of the pressure ring thickness to the nominal diameter, a smaller cross-sectional area perpendicular to the axial direction, and a lower connection accuracy between the optical lens pressure ring and the lens barrel. High-level features, so it is difficult to use this method to measure the pressure ring preload from a small end face

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