公开(公告)号：US11864864B2

公开(公告)日：2024-01-09

申请号：US17030546

申请日：2020-09-24

Applicant: PIXART IMAGING INC.

Inventor： Chun-Chih Chen ,  Yung-Chang Lin ,  Ming-Hsuan Ku

IPC: A61B5/00

CPC classification number: A61B5/0064 ,  A61B5/0082 ,  A61B5/681 ,  A61B5/6844 ,  A61B2560/0266

Abstract: A wearable device and a method for performing a registration process in the wearable device are provided. The wearable device includes a light source, a light sensor and a microcontroller that performs the method. In the method, the light source is activated to emit a detection light and the light sensor senses a reflected light. A light intensity of the reflected light is calculated. A registration value is produced based on the light intensity. Specifically, the detection light with a specific frequency to be registered in the registration value is used as a reference to detect whether the wearable device is properly worn by a person. For example, since the wearable device can be worn on the person's wrist, the registration value is used to detect whether the wearable device is away from the wrist.