Large-numerical-aperture near infrared object image bilateral telecentric optical system

Abstract

The invention discloses a large-numerical-aperture near infrared object image bilateral telecentric optical system. The large-numerical-aperture near infrared object image bilateral telecentric optical system comprises a first lens, a second lens, a beam splitter prism, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a diaphragm which are arranged sequentially along a light propagation direction from an image plane to an object plane, wherein the first lens is a double convex positive focal power lens; the second lens is a double concave negative focal power lens; the third lens is a meniscus positive focal power lens; the fourth lens is a double convex positive focal power lens; the fifth lens is a double concave negative focal power lens; the sixth lens is a double convex positive focal power lens; the seventh lens is a double convex positive focal power lens; and the eighth lens is a meniscus positive focal power lens. The object space numerical aperture of the telecentric optical system is up to 0.5, so that the detection and light collection capability is high. The resolution is up to 0.85[mu]m, so that high-resolution imaging can berealized. Moreover, bilateral telecentricity and low distortion of an object image can also be realized.

Description

technical field [0001] The invention relates to the field of optics, in particular to a double-sided telecentric optical system with a large numerical aperture near-infrared object image. Background technique [0002] The current machine vision system adopts the object-image bilateral telecentric optical system, which has the advantages of no image deformation, no viewing angle error, ultra-wide depth of field, ultra-low distortion, and constant imaging magnification. Compared with ordinary industrial lenses, it has obvious technical advantages. In the precision industry The detection field has been widely used. The object-image bilateral telecentric optical lenses in the existing market are generally used in the visible light detection spectrum. There are fewer types of telecentric industrial lenses in the near-infrared spectrum, and there are defects such as insufficient resolution and insufficient detection ability. Contents of the invention [0003] Aiming at the shor...

AI Technical Summary

Problems solved by technology

The object-image bilateral telecentric optical lenses in the existing market are generally used in the visible light detection spectrum. There are few types of telecentric industrial lenses in the near-infrared spectrum, and there are defects such as insufficient resolution and insufficient detection ability.

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