公开(公告)号：US20240038055A1

公开(公告)日：2024-02-01

申请号：US17878063

申请日：2022-08-01

Applicant: PIXART IMAGING INC.

Inventor： Ching-Kun CHEN ,  Guo-Zhen WANG

IPC: G08B29/18 ,  G08B29/20 ,  G08B25/00 ,  G08B17/103

CPC classification number: G08B29/185 ,  G08B29/20 ,  G08B25/008 ,  G08B17/103

Abstract: There is provided a fire alarm device including multiple light sources, a light sensor, a first processor and a second processor. In a standby mode, the first processor identifies whether to wake up the second processor according to a detection result of the light sensor obtained by detecting emission light of one of the multiple light sources. The second processor identifies whether to generate an alarm according to a detection result of the light sensor obtained by detecting emission light of the multiple light sources. The fire alarm device further includes a thermal sensor for providing detected temperature values to the first processor and/or the second processor to perform the identifying procedure.

公开(公告)号：US20230206743A1

公开(公告)日：2023-06-29

申请号：US18111605

申请日：2023-02-20

Applicant: PixArt Imaging Inc.

Inventor： Cheng-Nan TSAI ,  Guo-Zhen WANG ,  Ching-Kun CHEN ,  Yen-Chang CHU ,  Chih-Ming SUN

IPC: G08B17/107

CPC classification number: G08B17/107

Abstract: There is provided a smoke detector including a light source, a reflective surface, a light sensor and a processor. The light sensor receives reflected light when the light source emits light toward the reflective surface, and generates a reference detection signal when there is no smoke. The processor receives the detection signal from the light sensor, and automatically selects a set of predetermined condition thresholds according to a profile of the detection signal to be compared with the detection signal thereby determining whether to generate an alarm according to the comparison result.

公开(公告)号：US20220165141A1

公开(公告)日：2022-05-26

申请号：US17320222

申请日：2021-05-14

Applicant: PixArt Imaging Inc.

Inventor： Cheng-Nan TSAI ,  Guo-Zhen WANG ,  Ching-Kun CHEN ,  Yen-Chang CHU ,  Chih-Ming SUN

IPC: G08B17/107

Abstract: There is provided a smoke detector including a light source, a reflective surface, a light sensor and a processor. The light sensor receives reflected light when the light source emits light toward the reflective surface, and generates a reference detection signal when there is no smoke. The processor receives the detection signal from the light sensor, and automatically selects a set of predetermined condition thresholds according to a profile of the detection signal to be compared with the detection signal thereby determining whether to generate an alarm according to the comparison result.