Machine vision illumination lens for generating customized light spots and design method of machine vision illumination lens

Abstract

The invention belongs to the technical field of illumination design and machine vision, and particularly relates to a design method of an illumination lens for improving a vision detection system. According to the design method, a composite structure is adopted by a light distribution lens, two aspheric surfaces respectively perform total internal reflection light distribution and transmission light distribution on emergent light of a light source, so that the uniformity of irradiation distribution on a target surface is ensured, and bottom curved surfaces are used for customizing the shapes of uniform light spots on the target surface; and two groups of differential algebraic equations and a group of nonlinear equations are established in combination with the solid geometry relationship of the lens, and numerical solutions of the equations are processed into an illumination lens three-dimensional model and imported into optical tracing software for simulation. According to the designmethod, the uniform customized-shaped light spots can be generated, illumination can be customized in a targeted manner, the irradiation uniformity and the luminous flux utilization rate are high, anddifferent irradiance can be generated in different areas in the target surface according to the reflectivity design of a detection target, so that highlight or shadows in visual detection are inhibited, and the image quality of the visual detection is improved.

Description

technical field

[0001] The invention belongs to the technical field of lighting design and machine vision, and in particular relates to a lighting lens design method for improving a visual inspection system, which can not only generate uniform light spots with customized shapes on the target surface, but also produce different light spots in different regions of the target surface. radioactivity. Background technique

[0002] There are many kinds of detection targets for machine vision, which often contain multiple materials or have complex structures. Different materials have different reflectivities, and their ability to reflect illumination light is different. Therefore, the simple circle produced by the existing machine vision lighting system Uniform light spots can easily lead to highlights or shadows in the camera image; in addition, the detection target itself or a certain part may have a specific shape, such as a rectangle and a polygon, and a simple circular uniform...

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