Low cost color-programmable focusing ring light

Abstract

Provided herein are devices and methods of illuminating an object. The devices may include a housing having an inner reflective surface, an illumination source, disposed in a ring on the inner reflective surface of the housing, a fresnel lens disposed on the housing opposite the inner reflective surface, for focusing illumination to the object, and a partially reflective reflector, disposed on the fresnel lens, for transmitting illumination to the object and for reflecting illumination to the inner reflective surface. The illumination source may be a plurality of plurality of light emitting diodes disposed in a ring about the inner reflective surface, a ring light, or other illumination source. The partially reflective reflector may be a half-silvered mirror. The devices may further include a camera for viewing the object, an image processor, for processing an image from the camera, and a processor, for storing, manipulating and retrieving data corresponding to the image. The processor may be part of a system for inventory, materials handling, process control, or the like, or may be part of a machine vision device, such as a matrix code reader or a hand held scanner. The fresnel lens may be made interchangeable, so that lenses of different focal lengths may be used for viewing objects at different distances from the device. The device may include a circuit for controlling at least one of the color and the intensity of the illumination source.