PROBLEM TO BE SOLVED: To provide a light emitting device using a laser light source and a wavelength conversion member in which a time until the laser light source is turned off is set to be not longer than an allowable exposure time (s) for efficiency of lamp fitting when the wavelength conversion member has a deficit or the like.SOLUTION: A light emitting device comprises: a laser light source 12; a laser light source lighting circuit 14 which is means for supplying current to the laser light source and stops supply of current to the laser light source when receiving an input of a lights-out instruction signal from the outside; a wavelength conversion member 16 arranged on an optical path of the laser light source; a light detection part 20 for detecting an intensity of laser beams from the laser light source or an intensity of light from the wavelength conversion member; a comparator 26 for comparing the detection result of the light detection part and a predetermined threshold; and a switch control part 28 for outputting the lights-out instruction signal to the laser light source lighting circuit based on the comparison result of the comparator, in which a time until the laser light source is turned off is set to be not longer than an allowable exposure time (s).
【課題】レーザー光源及び波長変換部材を用いた発光装置において、波長変換部材が欠損などした場合、レーザー光源が消灯するまでの時間を、灯具効率を考慮した許容露光時間(ssafe)以下とする発光装置を提供する。【解決手段】レーザー光源12と、レーザー光源に対して電流を供給する手段であって、外部から消灯指示信号の入力を受けた場合、レーザー光源に対する電流の供給を停止するレーザー光源点灯回路14と、レーザー光源の光路上に配置された波長変換部材16と、レーザー光源からのレーザー光の強度又は波長変換部材からの光の強度を検出する光検出部20と、光検出部の検出結果と予め定められた閾値とを比較する比較器26と、比較器の比較結果に基づき、レーザー光源点灯回路に対して消灯指示信号を出力するスイッチ制御部28と、を備え、レーザー光源が消灯するまでの時間を許容露光時間(ssafe)以下とする。【選択図】図1
LIGHT EMITTING DEVICE, VEHICLE LAMP FITTING AND VEHICLE ILLUMINATING DEVICE
発光装置、車両用灯具、及び、車両用照明装置
2015-08-13
Patent
Electronic Resource
Japanese
IPC: | H01S Vorrichtungen, die stimulierte Emission verwenden , DEVICES USING STIMULATED EMISSION / B60Q ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL , Anordnung von Signal- oder Beleuchtungsvorrichtungen, deren Einbau oder Halterung oder deren Schaltkreise bei Fahrzeugen allgemein / F21S Ortsfeste Leuchten , NON-PORTABLE LIGHTING DEVICES |
European Patent Office | 2020
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