Optical range finder with directed attention
First Claim
1. An optical device for measuring a distance between the optical device and an object, the optical device comprising:
- an optical source for emitting a beam of electromagnetic radiation;
a focusing optical member for focusing the beam of electromagnetic radiation into a micro-mirror incident pattern;
a micro-mirror array receiving the micro-mirror incident pattern and outputting a controlled radiation pattern;
a processor for selecting a resolution level of the controlled radiation pattern of narrower beam size based on a previous lower resolution scan of greater beam size over a greater area;
a beam adjuster for selectively energizing one or more selected elements of the micro-mirror array to reduce a beam size of the beam from the greater beam size to the narrower beam size; and
a transmission optical member for focusing the controlled radiation pattern toward an object for estimation of a distance of the object from the optical device.
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Abstract
An optical range finder for determining the distance comprises a focusing optical member that focuses emitted electromagnetic radiation upon a micro-mirror array. A processor controls the micro-mirror array to direct the focused electromagnetic radiation into a defined radiation pattern consistent with a lower resolution scan over a greater area and a higher resolution scan over a lesser area of interest within the greater area. A transmission optical member focuses the defined radiation pattern toward an object. A reception optical member receives electromagnetic radiation reflected from the object. A detector detects the receipt of the reflected electromagnetic radiation. A timer determines an elapsed time, between transmission of the electromagnetic radiation to the object and receipt of the electromagnetic radiation from the object, to facilitate determination of the distance between the object and the range finder.
102 Citations
26 Claims
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1. An optical device for measuring a distance between the optical device and an object, the optical device comprising:
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an optical source for emitting a beam of electromagnetic radiation;
a focusing optical member for focusing the beam of electromagnetic radiation into a micro-mirror incident pattern;
a micro-mirror array receiving the micro-mirror incident pattern and outputting a controlled radiation pattern;
a processor for selecting a resolution level of the controlled radiation pattern of narrower beam size based on a previous lower resolution scan of greater beam size over a greater area;
a beam adjuster for selectively energizing one or more selected elements of the micro-mirror array to reduce a beam size of the beam from the greater beam size to the narrower beam size; and
a transmission optical member for focusing the controlled radiation pattern toward an object for estimation of a distance of the object from the optical device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An optical system for determining the range of an object, the optical system comprising:
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an optical source of electromagnetic radiation, a first transmitting lens for focusing or collimating the electromagnetic radiation;
a micro-mirror array for directing the focused electromagnetic radiation in a defined direction or pattern, a second transmitting lens for focusing the electromagnetic radiation reflected from the micro-mirror array;
a processor arranged to control the micro-mirror array to direct the focused radiation in the defined direction or pattern toward an object, the focused radiation having a resolution selected between a lower resolution scan of greater beam size over a greater area or a higher resolution scan of narrower beam size over a lesser area of interest based on a previous lower resolution scan over the greater area;
a beam adjuster for selectively energizing one or more selected elements of the micro-mirror array to reduce a beam size of the pattern from the greater beam size to the narrower beam size;
a receiving lens for receiving electromagnetic radiation reflected from the object, a detector for detecting the receipt of the reflected electromagnetic radiation;
a timer for determining an elapsed time between transmission of the electromagnetic radiation to the object and receipt of the electromagnetic radiation from the object; and
a converter for converting the elapsed time into a distance between the object and the optical system.
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17. A method for determining a distance of an object from a reference point, the method comprising:
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emitting electromagnetic radiation;
focusing the electromagnetic radiation upon a micro-mirror array;
directing the focused electromagnetic radiation in a defined direction or defined radiation pattern toward an object, consistent with a lower resolution scan of greater beam size over a greater area or a higher resolution scan of narrower beam size over a lesser area of interest based on a previous lower resolution scan over the greater area;
energizing one or more selected elements of the micro-mirror array to reduce a beam size of the pattern from the greater beam size to the narrower beam size;
receiving electromagnetic radiation reflected from the object;
detecting the receipt of the reflected electromagnetic radiation;
determining an elapsed time between transmission of the electromagnetic radiation to the object and receipt of the electromagnetic radiation from the object; and
converting the elapsed time into a distance between the object and the reference point. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification