LIGHT EMITTING DIODE LINEAR LIGHT WITH UNIFORM FAR FIELD

摘要

Described is a light emitting diode (LED) linear illumination system that includes a linear array of LED groups, high efficiency non-imaging optics and aberration corrected imaging optics. Each LED group can include one or more LEDs. The system provides uniform high intensity in near and far fields. System applications include machine vision and inspection of high reflectivity targets. Illumination can include one or more colors, including white light. The described system has improved thermal and optical performance and is generally more compact and lower in cost relative to conventional systems based on pre-packaged commercially available LED devices.

主权项

1. A light emitting diode (LED) linear illumination system, comprising:
a linear array of LED groups, each one of the LED groups having at least one LED and having an optical axis that is normal to a surface of each of the LEDs; a linear array of collection optics each disposed along a respective one of the optical axes and having an input aperture to collect radiation emitted from a respective one of the LED groups and having an output aperture through which the collected radiation propagates; a linear array of cylindrical field lenses each disposed on one of the optical axes adjacent to the output aperture of a respective one of the collection optics; a plurality of cylindrical lenses each having a focal length in a first plane and being disposed on one of the optical axes at a distance from the output aperture of a respective one of the collection optics by substantially a focal length to thereby image light from the output aperture to infinite; and a cylindrical lens having a focal length in a second plane that is orthogonal to the first plane, the cylindrical lens being disposed substantially at a distance from the input apertures of the linear array of collection optics to form an image of the input apertures in the second plane at an image plane.