Patents by Inventor Niladri Sarkar
Niladri Sarkar has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11914768Abstract: Systems and methods for determining the resonant frequencies of at least one axis of a two-axis resonant light scanner based on a measured resistance of at least a portion of one of the axes are disclosed. Precise knowledge of the resonant frequencies of each axis enables quasi-closed-loop operation of a light scanner, wherein the resonant frequencies of its axes can be periodically updated to ensure the proper drive frequencies are used. Furthermore, by determining the relationship between the measured resistance and scanner angle, calibration of the scanner is facilitated and even enabled at the wafer level during fabrication. In some cases, it also enables real-time monitoring of scanner position. Scanners in accordance with the present disclosure are suitable for use in any application that requires one or more reflective elements that can be scanned or steered in at least one dimension.Type: GrantFiled: July 27, 2022Date of Patent: February 27, 2024Assignee: AdHawk Microsystems Inc.Inventors: Duncan Wesley Strathearn, Kenneth McCoubrey, Nino Zahirovic, Fan Yang, Niladri Sarkar
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Publication number: 20240028116Abstract: The present disclosure is directed toward eye-tracking by scanning at least one scan beam over a scan region on an eye using a MEMS scanner at a first location, detecting a plurality of glints reflected from the scan region at a plurality of detectors, defining a plane for each glint that includes the location of its respective scanner and its respective detector, and identifying the corneal center of the eye based on the intersection of the plurality of planes. A gaze vector for the eye is then determined based on the corneal center and a pupil center identified using pupillometry.Type: ApplicationFiled: September 27, 2023Publication date: January 25, 2024Inventors: Fan YANG, Brendan Redmond O’HANLON, Nino ZAHIROVIC, Niladri SARKAR, Mahdi OLFAT, Mohammad MOHSENZADEH
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Publication number: 20230384427Abstract: Systems and methods for performing eye tracking using a scanning light signal with low power consumption are disclosed herein. Power consumption is reduced by intelligent disabling and re-enabling of non-imaging photodetector(s) and/or light source(s). In one embodiment, the scan region is contracted to a single feature of the eye (e.g., the pupil, a glint, etc.) in view of a particular type of event of interest to detect.Type: ApplicationFiled: May 25, 2023Publication date: November 30, 2023Inventors: Niladri SARKAR, Nino ZAHIROVIC
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Patent number: 11816259Abstract: Aspects of the present disclosure describe systems, methods, and structures that provide eye-tracking by 1) steering a beam of light through the effect of a microelectromechanical system (MEMS) onto a surface of the eye and 2) detecting light reflected from features of the eye including corneal surface, pupil, iris—among others. Positional/geometric/feature/structural information pertaining to the eye is determined from timing information associated with the reflected light.Type: GrantFiled: January 19, 2023Date of Patent: November 14, 2023Assignee: AdHawk Microsystems Inc.Inventors: Nino Zahirovic, Brendan Redmond O′Hanlon, Fan Yang, Niladri Sarkar
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Patent number: 11782504Abstract: Aspects of the present disclosure describe systems, methods, and structures that provide eye-tracking by 1) steering a beam of light through the effect of a microelectromechanical system (MEMS) onto a surface of the eye and 2) detecting light reflected from features of the eye including corneal surface, pupil, iris—among others. Positional/geometric/feature/structural information pertaining to the eye is determined from timing information associated with the reflected light.Type: GrantFiled: June 10, 2021Date of Patent: October 10, 2023Assignee: AdHawk Microsystems Inc.Inventors: Fan Yang, Brendan Redmond O'Hanlon, Nino Zahirovic, Niladri Sarkar, Mahdi Olfat, Mohammad Mohsenzadeh
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Publication number: 20230152888Abstract: Systems and methods for monitoring the instantaneous position of a scanning element of a light scanner via an optical-feedback signal are disclosed, where the optical-feedback signal is a portion of a light signal being steered in a two-dimensional pattern by the light scanner. The optical-feedback signal is detected by a position monitor that provides a commensurate feedback signal. In some embodiments, the feedback signal is used to develop a transfer function for the light scanner via a calibration routine. In some embodiments, the feedback signal is used in a closed-loop driving scheme used to drive the light scanner. Embodiments in accordance with the present disclosure are particularly well suited for use in object tracking systems, such as eye trackers.Type: ApplicationFiled: January 20, 2023Publication date: May 18, 2023Inventors: Duncan Wesley STRATHEARN, Kenneth MCCOUBREY, Nino ZAHIROVIC, Fan YANG, Niladri SARKAR
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Patent number: 11586285Abstract: Aspects of the present disclosure describe systems, methods, and structures that provide eye-tracking by 1) steering a beam of light through the effect of a microelectromechanical system (MEMS) onto a surface of the eye and 2) detecting light reflected from features of the eye including corneal surface, pupil, iris—among others. Positional/geometric/feature/structural information pertaining to the eye is determined from timing information associated with the reflected light.Type: GrantFiled: February 16, 2022Date of Patent: February 21, 2023Assignee: AdHawk Microsystems Inc.Inventors: Nino Zahirovic, Brendan Redmond O'Hanlon, Fan Yang, Niladri Sarkar
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Publication number: 20220382370Abstract: Systems and methods for determining the resonant frequencies of at least one axis of a two-axis resonant light scanner based on a measured resistance of at least a portion of one of the axes are disclosed. Precise knowledge of the resonant frequencies of each axis enables quasi-closed-loop operation of a light scanner, wherein the resonant frequencies of its axes can be periodically updated to ensure the proper drive frequencies are used. Furthermore, by determining the relationship between the measured resistance and scanner angle, calibration of the scanner is facilitated and even enabled at the wafer level during fabrication. In some cases, it also enables real-time monitoring of scanner position. Scanners in accordance with the present disclosure are suitable for use in any application that requires one or more reflective elements that can be scanned or steered in at least one dimension.Type: ApplicationFiled: July 27, 2022Publication date: December 1, 2022Inventors: Duncan Wesley STRATHEARN, Kenneth McCoubrey, Nino ZAHIROVIC, Fan YANG, Niladri SARKAR
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Patent number: 11435823Abstract: The present disclosure describes systems and methods that enable eye-tracking by steering a light signal in a high-density Lissajous pattern over a region of an eye and detecting light reflected from the eye using a non-imaging photodetector configuration. The light signal is scanned by driving each axis of a two-axis MEMS scanner with a periodic signal having a frequency that is based on the resonant frequency of that axis. By choosing periodic signals having frequencies that give rise to precession of the Lissajous pattern at a high rate, a high-density scan pattern is quickly generated, thereby enabling eye tracking with high spatial resolution and low latency.Type: GrantFiled: January 6, 2021Date of Patent: September 6, 2022Assignee: ADHAWK MICROSYSTEMSInventors: Niladri Sarkar, Nino Zahirovic, Fan Yang
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Publication number: 20220261074Abstract: Aspects of the present disclosure describe systems, methods, and structures that provide eye-tracking by 1) steering a beam of light through the effect of a microelectromechanical system (MEMS) onto a surface of the eye and 2) detecting light reflected from features of the eye including corneal surface, pupil, iris—among others. Positional/geometric/feature/structural information pertaining to the eye is determined from timing information associated with the reflected light.Type: ApplicationFiled: February 16, 2022Publication date: August 18, 2022Inventors: Nino ZAHIROVIC, Brendan Redmond O'HANLON, Fan YANG, Niladri SARKAR
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Publication number: 20220252868Abstract: The present disclosure is directed to compact packaging for optical MEMS devices, such as one- and two-dimensional light scanners. An embodiment in accordance with the present disclosure includes a housing having a chamber for holding a light source and a MEMS scanner. The MEMS scanner receives light from the light source via an optical element disposed on a cover of the housing and steers an output signal along a propagation direction through the cover while steering the output signal in at least one dimension.Type: ApplicationFiled: February 25, 2022Publication date: August 11, 2022Inventors: Niladri Sarkar, Dong YAN, Geoffrey LEE, Arash ROHANI, Nino ZAHIROVIC, Duncan Wesley STRATHEARN, John DOMM, Zhenhao LI, Gregory A. MAGEL
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Patent number: 11379035Abstract: Aspects of the present disclosure describe systems, methods, and structures that provide eye-tracking by 1) steering a beam of light through the effect of a microelectromechanical system (MEMS) operating at a resonant frequency onto a corneal surface; and 2) detecting the light reflected from the corneal surface.Type: GrantFiled: November 2, 2020Date of Patent: July 5, 2022Assignee: AdHawk Microsystems Inc.Inventor: Niladri Sarkar
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Patent number: 11262577Abstract: The present disclosure is directed to compact packaging for optical MEMS devices, such as one- and two-dimensional beam scanners. An embodiment in accordance with the present disclosure includes a light source and a MEMS-based scanning element for steering at least a portion of the light provided by the light source in at least one dimension as an output light signal, as well as one or more optical elements for collimating and/or redirecting light within a sealed chamber defined by the elements of a housing. In some embodiments, the one or more optical elements include a reflective lens that collimates the light provided by the light source while simultaneously correcting phase-front error imparted by the scanning element while steering the output beam.Type: GrantFiled: December 26, 2018Date of Patent: March 1, 2022Assignee: AdHawk MicrosystemsInventors: Niladri Sarkar, Dong Yan, Geoffrey Lee, Arash Rohani, Nino Zahirovic, Duncan Wesley Strathearn
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Publication number: 20210303064Abstract: Aspects of the present disclosure describe systems, methods, and structures that provide eye-tracking by 1) steering a beam of light through the effect of a microelectromechanical system (MEMS) onto a surface of the eye and 2) detecting light reflected from features of the eye including corneal surface, pupil, iris—among others. Positional/geometric/feature/structural information pertaining to the eye is determined from timing information associated with the reflected light.Type: ApplicationFiled: June 10, 2021Publication date: September 30, 2021Inventors: Fan YANG, Brendan Redmond O'HANLON, Nino ZAHIROVIC, Niladri SARKAR, Mahdi OLFAT, Mohammad MOHSENZADEH
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Patent number: 11048327Abstract: Aspects of the present disclosure describe systems, methods, and structures that provide eye-tracking by 1) steering a beam of light through the effect of a microelectromechanical system (MEMS) onto a surface of the eye and 2) detecting light reflected from features of the eye including corneal surface, pupil, iris—among others. Positional/geometric/feature/structural information pertaining to the eye is determined from timing information associated with the reflected light.Type: GrantFiled: December 27, 2018Date of Patent: June 29, 2021Assignee: AdHawk MicrosystemsInventors: Fan Yang, Brendan Redmond O'Hanlon, Nino Zahirovic, Niladri Sarkar, Mahdi Olfat, Mohammad Mohsenzadeh
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Publication number: 20210124416Abstract: The present disclosure describes systems and methods that enable eye-tracking by steering a light signal in a high-density Lissajous pattern over a region of an eye and detecting light reflected from the eye using a non-imaging photodetector configuration. The light signal is scanned by driving each axis of a two-axis MEMS scanner with a periodic signal having a frequency that is based on the resonant frequency of that axis. By choosing periodic signals having frequencies that give rise to precession of the Lissajous pattern at a high rate, a high-density scan pattern is quickly generated, thereby enabling eye tracking with high spatial resolution and low latency.Type: ApplicationFiled: January 6, 2021Publication date: April 29, 2021Inventors: Niladri Sarkar, Nino ZAHIROVIC, Fan YANG
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Publication number: 20210081041Abstract: Aspects of the present disclosure describe systems, methods, and structures that provide eye-tracking by 1) steering a beam of light through the effect of a microelectromechanical system (MEMS) operating at a resonant frequency onto a corneal surface; and 2) detecting the light reflected from the corneal surface.Type: ApplicationFiled: November 2, 2020Publication date: March 18, 2021Inventor: Niladri Sarkar
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Patent number: 10908683Abstract: Aspects of the present disclosure describe an improved calibration method for systems, methods, and structures that provide eye-tracking by 1) steering a beam of light through the effect of a microelectromechanical system (MEMS) onto a surface of the eye and 2) detecting light reflected from features of the eye including corneal surface, pupil, iris—among others. Positional/geometric/feature/structural information pertaining to the eye is determined from timing information associated with the reflected light.Type: GrantFiled: December 31, 2018Date of Patent: February 2, 2021Assignee: AdHawk MicrosystemsInventors: Niladri Sarkar, Fan Yang, Arash Rohani
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Patent number: 10824229Abstract: Aspects of the present disclosure describe systems, methods, and structures that provide eye-tracking by 1) steering a beam of light through the effect of a microelectromechanical system (MEMS) operating at a resonant frequency onto a corneal surface; and 2) detecting the light reflected from the corneal surface.Type: GrantFiled: January 20, 2018Date of Patent: November 3, 2020Assignee: AdHawk MicrosystemsInventor: Niladri Sarkar
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Publication number: 20190204913Abstract: Aspects of the present disclosure describe an improved calibration method for systems, methods, and structures that provide eye-tracking by 1) steering a beam of light through the effect of a microelectromechanical system (MEMS) onto a surface of the eye and 2) detecting light reflected from features of the eye including corneal surface, pupil, iris—among others. Positional/geometric/feature/structural information pertaining to the eye is determined from timing information associated with the reflected light.Type: ApplicationFiled: December 31, 2018Publication date: July 4, 2019Inventors: Niladri SARKAR, Fan YANG, Arash ROHANI