公开(公告)号：US11206725B2

公开(公告)日：2021-12-21

申请号：US17003901

申请日：2020-08-26

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Toshiaki Takenaka ,  Hirofumi. Konishi

IPC: H05B47/11 ,  H05B47/155 ,  F21K9/64 ,  F21Y115/30 ,  F21V23/00

Abstract: Lighting system includes light source that includes at least one light-emitting device and emits first light (laser light); wavelength conversion member that converts part of the first light into second light having a different wavelength from that of the first light; an optical system (light guide member) where the first light enters and that applies the first light to wavelength conversion member; optical sensor that receives part of the second light as monitor light and outputs monitor signal corresponding to the intensity of monitor light; and output control circuit that controls light source and optical sensor. Output control circuit performs an optical system inspection of conditions of the optical system and wavelength conversion member and a light source inspection of a condition of light source in accordance with monitor signal, using a time division method.