Patent ID: 11940293
Assignee: APPLE INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 17:
18. A finger device configured to be worn on a finger of a user, comprising:
a housing configured to be coupled to the finger;
a self-mixing interferometric proximity sensor coupled to the housing that measures changes in a distance between the self-mixing interferometric proximity sensor and a side of the finger, wherein the self-mixing interferometric proximity sensor comprises a vertical cavity surface emitting laser and a photodiode; and
control circuitry configured to determine a force of a touch input by the finger using the self-mixing interferometric proximity sensor, wherein the control circuitry is configured to obtain an I signal and a Q signal using output from the photodiode and wherein the vertical cavity surface emitting laser is updated based on a ratio between amplitudes of the I signal and the Q signal.