Patent ID: 6820810
Filing Date: 2004-11-23
Classification: G06K

Abstract:
In a light collection system including a light sensor having an optical axis, an optical collector for collecting light reflected from, and scanned in a scan across, a target, the optical collector comprising:a) a first collecting portion for optically collecting relatively more of the light reflected along directions that are generally inclined relative to the axis and from spaced-apart end regions of the scan, and for directing the collected light to the sensor with an increased intensity thereon; and b) a second collecting portion having a negative power for collecting relatively more of the light reflected along directions that are generally parallel relative to the axis and from an intermediate region of the scan between the end regions, and for directing the collected light to the sensor with a decreased intensity thereon, thereby decreasing light intensity variation over the scan, the first and second collecting portions being integral parts of a collection lens.