Manufacturing method for high precision pentagonal prism

Abstract

The invention provides a manufacturing method for a high precision pentagonal prism, which delicately utilizes the pentagonal prism angle relation through copying the high precision angle of the square brick and adopts a regular optical cement to realize the pentagonal prism high accuracy processing. The manufacture method comprises steps of using an optical cement supporting body with accuracy being 90 degree+ / -2' to guarantee the perpendicularity between the four working faces of the pentagonal prism and the side to be within 5'and guarantee a second parallel error, using a comparison angle measurement instrument to monitor the upper plate of the angle optical cement, respectively guaranteeing the processing accuracy of a 90-degree angle and a 22.5 degree angle, and guaranteeing a first parallel difference of the part. The invention avoids the process of single-piece angle modification by adopting the high accuracy angle of coping the square brick, produces the batch plates, performs find grinding and controls the parallel. The invention solves the problem that the reworking rate is high and the rate of finished goods is low.

Description

technical field [0001] The invention belongs to the technical field of optical cold processing, in particular to a method for manufacturing a high-precision pentaprism. Background technique [0002] In the optical system, the "pentaprism" is one of the beam deflectors with a fixed angle (90°). Its purpose is to redirect the incident light to a certain angle (90°) by the outgoing light regardless of the incident angle on the first surface. The second use is that the imaging of the pentaprism has neither rotation nor specular reflection, and its manufacturing accuracy directly affects its role in the optical system. The technical indicators that affect the pentaprism in the optical system include: 1. First, second Parallelism (θ Ⅰ , θ Ⅱ ),Such as figure 1 As shown, that is, when the light is vertically incident from the incident surface A of the prism, the deviation of the light to the normal line of the exit surface before exiting, the component in the cross-sectional dire...

AI Technical Summary

Problems solved by technology

[0004] 1. The first and second parallel out-of-tolerance are caused by the failure to attach tightly during processing;

[0005] 2. Dispensing processing is prone to movement due to untimely processing, which affects the angle processing accuracy;

[0006] 3. Changing the angle and verticality of a single part is time-consuming and low in work efficiency;

[0007] 4. It is easy to produce observation window prints or corrosion to affect surface defects

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