Large view field double telecentric optical system

Abstract

The invention discloses a large view field double telecentric optical system. The large view field double telecentric optical system includes a first optical component, an aperture stop, and a secondoptical component that are sequentially disposed from the object side to the image side along the optical axis; the combined focal power of the first optical component is positive, the combined focalpower of the second optical component is positive, the focal planes of the first optical component and the second optical component coincide, and the focal plane coincides with the plane in which theaperture stop is located; the first optical component includes a lens I and glued lens II and lens III; the focal power of the lens I is positive and partially bears the combined focal power of the first optical component; and the combined focal power of the lens II and the lens III is positive and partially bears the combined focal power of the first optical component, so that the main lights ofdifferent wavelengths of different fields of view are precisely concentrated in the plane in which the aperture stop is located. The large view field double telecentric optical system corrects the spherical aberration and chromatic aberration generated by the main lights of different wavelengths of different fields within a certain range, and obtains a high telecentricity; and the large view fielddouble telecentric optical system has the advantages that the telecentricity differences of the lights of different wavelengths are not large.

Description

technical field [0001] The invention relates to an optical instrument, in particular to a double telecentric optical system with a large field of view. Background technique [0002] In machine vision and industrial automation systems, optical automatic inspection is particularly critical, and optical lenses are the core components to realize optical automatic inspection. [0003] Bi-telecentric lenses are more and more widely used for their excellent imaging quality, minimal distortion, and minimal parallax. [0004] On the one hand, the optical structure of the bi-telecentric lens is relatively complex, especially for the bi-telecentric lens with a large field of view. The use of multiple large-diameter lenses makes the lens extremely expensive and heavy. The use of lenses is the key; on the other hand, in order to pursue cost control and simple process, if too few large-aperture lenses are used, the telecentricity will be poor due to the influence of spherical aberration ...

AI Technical Summary

Problems solved by technology

[0004] On the one hand, the optical structure of the bi-telecentric lens is relatively complex, especially for the bi-telecentric lens with a large field of view. The use of multiple large-diameter lenses makes the lens extremely expensive and heavy. The use of lenses is the key; on the other hand, in order to pursue cost control and simple process, if too few large-aperture lenses are used, the telecentricity will be poor due to the influence of spherical aberration and chromatic aberration, or the telecentricity will change with the wavelength. Unfavorable effects such as severe and unfavorable to the realization of high-precision measurement

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