US 11,988,894 B2
Lens displacement detection circuit for an optical device
John Kevin Moore, Edinburgh (GB)
Assigned to STMicroelectronics (Research & Development) Limited, Marlow (GB)
Filed by STMicroelectronics (Research & Development) Limited, Marlow (GB)
Filed on Feb. 26, 2021, as Appl. No. 17/186,179.
Prior Publication US 2022/0276461 A1, Sep. 1, 2022
Int. Cl. G02B 7/10 (2021.01); G02B 7/02 (2021.01); H04N 23/54 (2023.01)
CPC G02B 7/102 (2013.01) [G02B 7/021 (2013.01); H04N 23/54 (2023.01)] 23 Claims
OG exemplary drawing
 
1. An optical device, comprising:
a lens holder;
a lens;
wherein the lens holder is configured to receive the lens;
wherein the lens includes a first electrical trace;
wherein the lens holder includes a second electrical trace; and
wherein the first and second electrical traces form electrodes of a sense capacitor;
a capacitive sensing circuit electrically coupled to the first and second electrical traces and configured to sense a capacitance of the sense capacitor; and
a light emitting circuit configured to emit light that passes through said lens, and wherein said light emitting circuit is enabled for operation if the capacitance of the sense capacitor sensed by the capacitive sensing circuit is within a certain range.