Optical Three-Dimensional Coordinate Sensor System and Method Thereof
First Claim
1. An optical three-dimensional coordinate sensor system, comprising:
- a plurality of light-emitting modules emitting a plurality of light signals to an object;
a plurality of sensing modules, comprising;
a plurality of photodetectors receiving a plurality of reflected light signals reflected by the object to generate a plurality of photocurrents;
a plurality of active pixel circuits (APCs) connected to the photodetectors for receiving the photocurrents and transforming the photocurrents to a plurality of reflective optical voltages, each of the APCs comprising at least one active transistor within a pixel unit cell;
a plurality of sampling circuits connected to the APCs for sampling and storing the reflective optical voltages, each of the sampling circuits comprising a sampling transistor and a capacitor; and
a plurality of differential amplifier circuits (DACs) connected to the sampling circuits for receiving the reflective optical voltages, each of the DACs subtracting the reflective optical voltage from a background voltage and multiplying a differential gain thereto, the DACs outputting a plurality of DAC output voltages of the reflected light signals; and
a processing module connected to the sensing modules for detecting the DAC output voltages and using an algorithm to calculate top three of the DAC output voltages to determine a three-dimensional coordinate of the object.
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Abstract
The present invention relates an optical three-dimensional coordinate sensor system and method thereof. A plurality of light-emitting modules produce a plurality of light signals, and then a plurality of reflected light signals reflected by an object are received by a plurality of photodetectors. After receiving the reflected light signals, the photodetectors generate a plurality of photocurrents. A plurality of active pixel circuits receive the photocurrents and transform the photocurrents to a plurality of reflective optical voltages. A plurality of differential amplifier circuits (DAC) compare the reflective optical voltages and the background voltages, and then output a plurality of DAC output voltages of the reflected light signals. Afterward, a processing module detects the DAC output voltages and uses an algorithm to calculate the top three of the DAC output voltages to determine the three-dimensional coordinate of the object.
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Citations
20 Claims
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1. An optical three-dimensional coordinate sensor system, comprising:
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a plurality of light-emitting modules emitting a plurality of light signals to an object; a plurality of sensing modules, comprising; a plurality of photodetectors receiving a plurality of reflected light signals reflected by the object to generate a plurality of photocurrents; a plurality of active pixel circuits (APCs) connected to the photodetectors for receiving the photocurrents and transforming the photocurrents to a plurality of reflective optical voltages, each of the APCs comprising at least one active transistor within a pixel unit cell; a plurality of sampling circuits connected to the APCs for sampling and storing the reflective optical voltages, each of the sampling circuits comprising a sampling transistor and a capacitor; and a plurality of differential amplifier circuits (DACs) connected to the sampling circuits for receiving the reflective optical voltages, each of the DACs subtracting the reflective optical voltage from a background voltage and multiplying a differential gain thereto, the DACs outputting a plurality of DAC output voltages of the reflected light signals; and a processing module connected to the sensing modules for detecting the DAC output voltages and using an algorithm to calculate top three of the DAC output voltages to determine a three-dimensional coordinate of the object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An optical three-dimensional coordinate sensing method, comprising the following steps:
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emitting a plurality of light signals to an object by a plurality of light-emitting modules; receiving a plurality of reflected light signals reflected by the object and generating a plurality of photocurrents by a plurality of photodetectors; receiving the photocurrents and transforming the photocurrents to a plurality of reflective optical voltages by a plurality of active pixel circuits (APCs); sampling and storing the reflective optical voltages by a plurality of sampling circuits; subtracting the reflective optical voltages from a plurality of background voltages and multiplying differential gains thereto to output a plurality of differential amplifier circuit (DAC) output voltages of the reflected light signals by a plurality of differential amplifier circuits (DACs); and detecting the DAC output voltages and using an algorithm by a processing module to calculate top three of the DAC output voltages to determine a three-dimensional coordinate of the object. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification