Zoom telecentric lens and imaging device

Abstract

The invention discloses a zoom telecentric lens and an imaging device. The zoom telecentric lens comprises a front optical group arranged in a front lens cone and a rear optical group arranged in a rear lens cone. The front optical group is a fixed group, the rear optical group is a movable group, a diaphragm is arranged between the front optical group and the rear optical group, and the distancebetween the diaphragm and an image plane meets a condition that L / beta is greater than 10 and is less than 30. The rear optical group comprises a sixth lens, a seventh lens and an eighth lens which are sequentially arranged in the incident direction of light, the variable quantity of the distance from the eighth lens to the image plane meets the equation that deltaL4=16.99 (beta2-beta1), the refractive index range of all the lenses in the rear optical group is 1.65-1.75, and an Abbe number range is 30-55. According to the invention, random zoom of the telecentric lens between 2.5 times-10 times is realized by changing the intervals among the diaphragm, the rear optical group and the image plane, the design pressure and the production cost of the telecentric lens are reduced, the assembly process of a telecentric lens zoom system is simplified, and a user experience is improved.

Description

technical field [0001] The invention relates to the technical field of advanced manufacturing and automation, in particular to a variable magnification telecentric lens and an imaging device. Background technique [0002] With the wide application of machine vision systems in the field of precision inspection, it is difficult for ordinary optical lenses to meet the inspection requirements. In order to make up for the shortcomings of ordinary optical lenses, telecentric lenses came into being. It has unique optical characteristics: high resolution, ultra-wide depth of field, ultra-low distortion and unique parallel light design, etc., bringing quality to machine vision precision inspection. leap. [0003] However, the existing types of telecentric lenses are uneven and diverse, and there are too many telecentric lenses with various multiples, which not only brings huge design pressure and cost pressure to designers and manufacturers, but also requires users to use the camera...

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a zoom telecentric lens and an imaging device to solve the problem that the existing imaging device needs to be equipped with telecentric lenses of different multiples to achieve the required multiplier effect. High manufacturing cost, complex assembly process and other issues

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