PROBLEM TO BE SOLVED: To stably adjust a low intensity laser beam even in a wide temperature range.SOLUTION: A laser beam intensity adjusting device comprises: light sources (LD 11r, 11g, 11b) emitting laser beams; a scan unit 40 scanning the laser beam emitted by the light source to generate a display image; a transmitted beam adjustment unit including a liquid crystal cell 21 and a polarizer, and transmitting therethrough the laser beam emitted by the light source with a predetermined transmissivity; a temperature detection unit 30 detecting the temperature of the liquid crystal cell 21; and a control unit 300 controlling the transmissivity of the transmitted beam adjustment unit by driving the liquid crystal cell 21. On the basis of the temperature detected by the temperature detection unit 30, the control unit 300 corrects fluctuations in transmissivity caused by a temperature change of the liquid crystal cell 21 and controls the transmissivity of the transmitted beam adjustment unit, thereby adjusting a light intensity of the laser beam reaching the scan unit 40.
【課題】広い温度範囲においても、低強度のレーザー光を安定して調整する。【解決手段】レーザー光強度調整装置は、レーザー光を発する光源(LD11r,11g,11b)と、光源が発したレーザー光を走査して表示画像を生成する走査部40と、液晶セル21と偏光板とを有し、光源が発したレーザー光を所定の透過率で透過させる透過光調整部と、液晶セル21の温度を検出する温度検出部30と、液晶セル21を駆動して透過光調整部の透過率を制御する制御部300と、を備える。制御部300は、温度検出部30が検出した温度に基づいて、液晶セル21の温度変化による透過率の変動分を補正して透過光調整部の透過率を制御し、走査部40に到達するレーザー光の光強度を調整する。【選択図】図6
LASER BEAM INTENSITY ADJUSTING DEVICE
レーザー光強度調整装置
2015-10-22
Patent
Elektronische Ressource
Japanisch
IPC: | G02F DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING,... , Vorrichtungen oder Anordnungen, deren optische Arbeitsweise durch Änderung der optischen Eigenschaften des Mediums der Vorrichtungen oder Anordnungen geändert wird zum Steuern der Intensität, Farbe, Phase, Polarisation oder der Richtung von... / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES / G02B Optische Elemente, Systeme oder Geräte , OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS |
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