SYSTEM AND METHOD FOR ACQUIRING IMAGES OF SURFACE TEXTURE

摘要

This invention provides a vision system camera assembly that includes an optics and illumination module that is removably attached thereto, and that is arranged to project illumination along an optical axis of the imager. This arrangement allows for short exposure time and a short working distance from an imaged scene/surface under inspection. A semi-reflecting mirror turns a structured illumination beam from an illumination axis onto the optical axis while allowing light from the imaged scene to pass through the mirror and into the imager optics. The front end of the module contains a collimating optics that causes a collimated beam from the mirror to strike the surface at various off-axis angles. The collimating optics can include a telecentric lens assembly that can comprise a pair of stacked lenses having a perimeter that is equal to or greater than the area of interest on the surface.

主权项

1. A vision system for imaging a surface having a fiber-like texture comprising:
a vision system camera with an imager and a camera lens assembly that projects light from the imaged surface onto the imager aligned along an optical axis; and an illumination module positioned between the imaged surface and the camera lens assembly, the illumination module having, (a) an illumination element, (b) a semi-reflective mirror that allows light from the images surface to pass therethrough and into the camera lens assembly and that reflects light generated by the illumination element along an illumination axis onto the optical axis to project on the imaged scene, and (c) a collimating optics assembly that collimates the light as it is projected onto the scene, the projected light defining at least in part, a structured, off-axis light pattern; and a telecentric lens assembly located along the optical axis at a front of the module constructed and arranged to provide a short working distance between the vision system and the surface.