LED ILLUMINATION DEVICE

• Main Authors: KANO SHUJI, UMETSU KENJI
• Format: Patent
• Language: English; Japanese
• Published: 07.03.2019
• Subjects: BLASTING; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-PORTABLE LIGHTING DEVICES; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

To increase illumination intensity and extend a range where the illumination intensity is uniform.SOLUTION: An LED illumination device includes an optical unit consisting of a plurality of lenses 3 and LEDs 2. The lens 3 is a resin convex lens whose first surface is flat or nearly flat. The LED 2 disposed close to the optical axis of the lens 3 has a flat light emitting surface, and its light distribution is a Lambert distribution. When an opposite side size of the LED 2 is represented by dLED, a focal distance of the lens 3 is represented by f, a paraxial magnification of the optical system is represented by m, an interval between the lens 3 and the LED 2 is represented by d0, a curvature radius of the first surface of the lens 3 is represented by R1, and a diameter of the lens is represented by D, the following expressions are satisfied: dLED×3≤f≤dLED×10, 1.5≤m≤5, d0≤D/4, R1|≥dLED×3, and D≥dLED×2.5.SELECTED DRAWING: Figure 5 【課題】照度を上げると共に照度が均一な範囲を広げる。【解決手段】本発明は、複数のレンズ３とＬＥＤ２とからなる光学ユニットを備え、レンズ３は第１面が平面又は平面に近い樹脂性凸レンズであり、ＬＥＤ２は発光面が平面であり、配光分布がランベルト分布であり、レンズ３の光軸付近に配置され、ＬＥＤ２の対辺寸法をｄＬＥＤ、レンズ３の焦点距離をｆ、光学系の近軸倍率をｍ、レンズ３とＬＥＤ２の間隔をｄ０、レンズ３の第１面の曲率半径をＲ１、前記レンズ径をＤとした時に、ｄＬＥＤ×３≦ｆ≦ｄＬＥＤ×１０１．５≦ｍ≦５ｄ０≦Ｄ／４｜Ｒ１｜≧ｄＬＥＤ×３Ｄ≧ｄＬＥＤ×２．５を満たすことを特徴とする。【選択図】図５