US 11,914,768 B2
Resonant light scanner having drive-frequency control based on an electrical parameter
Duncan Wesley Strathearn, Waterloo (CA); Kenneth McCoubrey, Kitchener (CA); Nino Zahirovic, Waterloo (CA); Fan Yang, London (CA); and Niladri Sarkar, Waterloo (CA)
Assigned to AdHawk Microsystems Inc., Waterloo (CA)
Filed by AdHawk Microsystems Inc., Waterloo (CA)
Filed on Jul. 27, 2022, as Appl. No. 17/874,385.
Application 17/874,385 is a continuation in part of application No. 17/143,048, filed on Jan. 6, 2021, granted, now 11,435,823.
Application 17/143,048 is a continuation in part of application No. 17/087,302, filed on Nov. 2, 2020, granted, now 11,379,035, issued on Jul. 5, 2022.
Application 17/087,302 is a continuation of application No. 15/876,148, filed on Jan. 20, 2018, granted, now 10,824,229, issued on Nov. 3, 2020.
Claims priority of provisional application 62/448,577, filed on Jan. 20, 2017.
Claims priority of provisional application 63/134,467, filed on Jan. 6, 2021.
Claims priority of provisional application 62/957,696, filed on Jan. 6, 2020.
Claims priority of provisional application 63/227,160, filed on Jul. 29, 2021.
Prior Publication US 2022/0382370 A1, Dec. 1, 2022
Int. Cl. G06F 3/01 (2006.01); G02B 26/10 (2006.01); G02B 27/00 (2006.01); G02B 26/08 (2006.01); G02B 27/01 (2006.01)
CPC G06F 3/013 (2013.01) [G02B 26/0833 (2013.01); G02B 26/105 (2013.01); G02B 27/0093 (2013.01); G02B 27/0172 (2013.01); G02B 27/0176 (2013.01); G02B 2027/0178 (2013.01)] 32 Claims
OG exemplary drawing
 
1. A method comprising:
providing a light scanner having a scanning element, a first actuator comprising a first portion that includes a first actuator element and a second portion that includes a second actuator element, and a second actuator comprising a third portion that includes a third actuator element and a fourth portion that includes a fourth actuator element, the first actuator being configured to rotate the scanning element about a first axis and the second actuator configured to rotate the scanning element about a second axis, wherein the first axis has a first resonant frequency and the second axis has a second resonant frequency;
applying a first test drive to the first actuator element to induce a first oscillation on the first axis;
measuring a first resistance of at least one of the second, third, and fourth portions in response to the first oscillation; and
estimating the first resonant frequency based on the first resistance.