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公开(公告)号：US20190386460A1
公开(公告)日：2019-12-19
申请号：US16219754
申请日：2018-12-13
Applicant: Analog Devices, Inc.
Inventor： Erik D. BARNES , Lawrence A. SINGER , Harvey WEINBERG
Abstract: Optical systems can emit train(s) of light pulses onto objects to derive a distance between the light source and the object. Achieving meter or centimeter resolution may require very short light pulses. It is not trivial to design a circuit that can generate narrow current pulses for driving a diode that emits the light pulses. An improved driver circuit has a pre-charge path comprising one or more inductive elements and a fire path comprising the diode. Switches in the driver circuit are controlled with predefined states during different intervals to pre-charge current in the one or more inductive elements prior to flowing current through the fire path to pulse the diode.
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2.发明申请公开(公告)号：US20190391238A1
公开(公告)日：2019-12-26
申请号：US16387385
申请日：2019-04-17
Applicant: Analog Devices, Inc.
Inventor： Erik D. BARNES , Charles MATHY , Sefa DEMIRTAS
Abstract: Depth imagers can implement time-of-flight operations to measure depth or distance of objects. A depth imager can emit light onto a scene and sense light reflected back from the objects in the scene using an array of sensors. Timing of the reflected light hitting the array of sensors gives information about the depth or distance of objects in the scene. In some cases, corrupting light that is outside of a field of view of a pixel in the array of sensors can hit the pixel due to internal scattering or internal reflections occurring in the depth imager. The corrupting light can corrupt the depth or distance measurement. To address this problem, an improved depth imager can isolate and measure the corrupting light due to internal scattering or internal reflections occurring in the depth imager, and systematically remove the measured corrupting light from the depth or distance measurement.
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