Tolerance analysis method of fundus camera

Abstract

The invention provides a tolerance analysis method of a fundus camera. The tolerance analysis method comprises the steps: determining an upper limit and lower limit of tolerance according to the processing capacity of a lens processing factory; according to system characteristics, determining tolerance types and compensator types, which need to be finally analyzed; according to the system characteristics, setting a group of appropriate variable tolerance initial values, and setting the compensator types as variables; determining a system performance evaluation standard, and analyzing the change condition of system performance under the conditions of current tolerance value and compensator by using a tolerance function of optical design software; according to the current analysis result and system requirement, determining whether the current tolerance value satisfies the requirement; if a final requirement cannot be satisfied after the above steps are carried out, the current system structure needs to be redesigned, and then, the tolerance analysis is performed again, until the requirement is satisfied. According to the invention, main tolerance types of an optical system and the concrete process of performing tolerance analysis are introduced. The detailed tolerance analysis is performed on an imaging system of the fundus camera, and finally, the system is enabled to be sent to the factory for processing.

Description

technical field [0001] The invention relates to a tolerance analysis method of an optical device, in particular to a tolerance analysis method of a fundus camera, which belongs to the detection field of a fundus imaging system. Background technique [0002] After the optical device is designed, it is necessary to conduct a detailed tolerance analysis on the system before sending it to the factory for processing. During the processing of optical parts, due to the influence of various factors such as systematic errors and random errors in the processing equipment, the optical surface cannot be completely consistent with the standard template. The maximum error variation range of the size, shape and position allowed by the part in processing is called tolerance. In the process of parts processing and installation, too loose tolerances often cause the actual processed system performance to be far lower than the theoretical design value, and sometimes even the performance is too...

AI Technical Summary

Problems solved by technology

In the process of parts processing and installation, too loose tolerances often cause the actual processed system performance to be far lower than the theoretical design value, and sometimes even the performance is too low, causing the system to fail to meet the requirements

However, although an over-tight tolerance makes the actual system performance closer to the theoretical value, it will increase the difficulty of processing technology and assembly, which will greatly increase the cost and cause waste.

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