Surface Confined Self-Mixing Interferometry Through Frustrated Total Internal Reflection for an Electronic Device

    公开(公告)号:US20210294489A1

    公开(公告)日:2021-09-23

    申请号:US16827646

    申请日:2020-03-23

    Applicant: Apple Inc.

    Abstract: A self-mixing interference sensor may be positioned within an electronic device and may be configured to detect a gesture on a user input surface of the electronic device. A beam of electromagnetic radiation may be emitted from the self-mixing interference sensor toward the user input surface. When an object with a suitable refractive index is not in contact with the user input surface, the beam of electromagnetic radiation may reflect away from the self-mixing interference sensor. When an object with a suitable refractive index is in contact with the user input surface, the beam of electromagnetic radiation may reflect back into the self-mixing interference sensor and may undergo a self-mixing process. A property of the object in contact with the surface of the user input device may be detected by measuring a change in an optical property of the beam of electromagnetic radiation.

    Cylindrical Retroreflector Array for Rotation Tracking

    公开(公告)号:US20230086536A1

    公开(公告)日:2023-03-23

    申请号:US17480636

    申请日:2021-09-21

    Applicant: Apple Inc.

    Abstract: An electronic device is described. The electronic device may include a housing, a rotatable crown, and a self-mixing interferometry (SMI) sensor positioned within the housing. The rotatable crown may include an array of retroreflective surface features that reflect incident light back to a light source. Each retroreflective surface feature of the array of retroreflective surface features may be formed as a corner-cube with three perpendicular faces. The SMI sensor or associated processing electronics may compare originally emitted light with reflected light to identify a movement or distance of the rotatable crown with respect to the SMI sensor.

Patent Agency Ranking