公开(公告)号：US20230404419A1

公开(公告)日：2023-12-21

申请号：US18196953

申请日：2023-05-12

Applicant: Apple Inc.

Inventor： Nicholas P. Allec ,  Albert E. Cerussi ,  Maximillian C. Bruggeman ,  Xiyu Duan ,  Ueyn L. Block

IPC: A61B5/024 ,  G04B47/06 ,  G06F1/16 ,  A61B5/00

CPC classification number: A61B5/02416 ,  G04B47/063 ,  G06F1/163 ,  A61B5/681

Abstract: A wearable device includes a housing; a wrist band attached to the housing; first and second emitters positioned within the housing and configured to respectively emit, through a back of the housing, a first beam of electromagnetic radiation having a first infrared (IR) wavelength and a second beam of electromagnetic radiation having a second IR wavelength. The second IR wavelength is different from the first IR wavelength. The wearable device also includes a photodetector positioned within the housing and filtered to detect a set of electromagnetic radiation wavelengths including the first IR wavelength and the second IR wavelength; and a matter differentiation circuit configured to indicate, at least partly in response to signals indicating amounts of the first IR wavelength and the second IR wavelength received by the photodetector, whether the back of the housing is likely proximate to human tissue.

公开(公告)号：US20220225006A1

公开(公告)日：2022-07-14

申请号：US17149552

申请日：2021-01-14

Applicant: Apple Inc.

Inventor： Nicholas P. Allec ,  Yuta Kuboyama ,  Xiaoyang Zhang ,  Xi Chen ,  Ryan M. Buck ,  Praveesh Chandran ,  Yifei Wang ,  Tingjun Xu

IPC: H04R1/10 ,  G02B5/28 ,  A61B5/00

Abstract: A wearable electronic device such as an earbud, wristwatch, or other device may be provided with a skin sensor. The skin sensor may use optical measurements to detect the presence of skin adjacent to the electronic device. The sensor may have first and second light-emitting devices such as infrared devices that emit light at respective first and second infrared light wavelengths. Reflected light is monitored by a photodetector. Control circuitry can initiate or pause audio playback or take other actions in response to determining from the reflected light measurements that skin is present. The sensor may have a thin-film interference filter or other optical structure that overlaps the first and second light-emitting devices to narrow the angular spread of light emitted from the skin sensor. This reduces tilt sensitivity and helps enhance skin sensor accuracy.