Title:
光センサ
Document Type and Number:
Japanese Patent JP7190857
Kind Code:
B2
Abstract:
To perform accurate flicker detection with minimum communication.SOLUTION: A photosensor 1 includes a first photodetection circuit 10 which outputs a first photodetection signal S1 corresponding to the quantity of environmental light, and a logic circuit 30 which outputs pulses of a flag signal S3 for each peak period of the first photodetection signal S1. The logic circuit 30 preferably sets a reference value of the pulse output period of the flag signal S3 according to the measured value of the peak period. Further, the logic circuit 30 preferably finds a correction value of the pulse output period on the basis of a deviation between a measured value of the peak period and the reference value of the pulse output period. The logic circuit 30 preferably finds the measured value of the peak period by detecting a plurality of peak positions of the first photodetection signal S1.SELECTED DRAWING: Figure 1
Inventors:
Junichi Ishifuji
Yoshitsugu Kamihira
Yoshitsugu Kamihira
Application Number:
JP2018186400A
Publication Date:
December 16, 2022
Filing Date:
October 01, 2018
Export Citation:
Assignee:
ROHM Co., Ltd.
International Classes:
G01J1/42; G01J1/44; G03B7/091; H04N5/225; H04N5/235
Domestic Patent References:
| JP2018006802A | ||||
| JP2018064214A | ||||
| JP8201158A | ||||
| JP2016134753A | ||||
| JP2015138011A | ||||
| JP2016135173A | ||||
| JP2014220763A |
Attorney, Agent or Firm:
Patent Attorney Corporation Sano Patent Office