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    • 70. 发明授权
    • ILLUMINATION SYSTEM, LUMINAIRE AND BACKLIGHTING UNIT
    • BELEUCHTUNGSSYSTEM,LEUCHTE UNDRÜCKBELEUCHTUNGSEINHEIT
    • EP2150851B1
    • 2015-03-11
    • EP08763104.0
    • 2008-05-26
    • Koninklijke Philips N.V.
    • BOONEKAMP, Erik
    • G02F1/13357F21S10/02F21V9/10
    • F21V13/10F21V7/0008F21V7/0025F21V9/30F21V11/02F21Y2103/10F21Y2103/33F21Y2113/13F21Y2115/10G02F1/13336G02F1/133606G02F1/133615G02F1/133617G02F1/133621G02F2001/133507
    • The invention relates to a lighting device (2, 8) having a light exit window (30) for emitting light. The lighting device further comprises a diffuse reflecting screen (40, 46) that is arranged opposite the light exit window and that comprises a structured reflecting surface. The lighting device also comprises a light source (20) for indirectly illuminating the light exit window via the diffuse reflecting screen. The light source is arranged near an edge of the light exit window on an imaginary plane (22) arranged substantially parallel to the light exit window and emits light away from the light exit window. The lighting device also comprises an edge wall (62) arranged between the diffuse reflecting screen and the light exit window. The edge wall comprises a specular reflecting mirror (60) being concavely shaped for reflecting at least part of the light emitted by the light source towards the diffuse reflecting screen. The use of the specular reflecting mirror enables a controlled reflection of the part of the light emitted by the light source towards the diffuse reflecting screen, and because the diffuse reflecting screen comprises a structured reflecting surface, specular reflections are avoioded which may otherwise occur when light impinges on a diffuse reflecting surface at grazing angles. Consequently, the lighting device has improved uniformity over the light exit window.
    • 本发明涉及一种具有用于发光的光出射窗(30)的照明装置(2,8)。 照明装置还包括与光出射窗口相对布置并且包括结构化反射表面的漫反射屏(40,46)。 照明装置还包括用于经由漫反射屏间接照射光出射窗的光源(20)。 光源布置在光出射窗的边缘附近,该虚拟平面(22)基本上平行于光出射窗设置并从光出射窗口射出光。 照明装置还包括布置在漫反射屏和光出射窗之间的边缘壁(62)。 边缘壁包括镜面反射镜(60),其被成形为用于将由光源发射的光的至少一部分反射到漫反射屏幕。 镜面反射镜的使用使得能够将由光源发射的光的一部分的受控反射朝向漫反射屏幕,并且由于漫反射屏幕包括结构化的反射表面,镜面反射是avoioded的,否则当光 以放射角度在漫反射面上撞击。 因此,照明装置在光出射窗上具有改善的均匀性。