| 摘要 |
There is provided a light-emitting device (1) that may be mounted in a ceiling. The light-emitting device (1) comprises an optically reflecting layer (11) and a light-transmissive layer (12) arranged such that a space is formed in-between. In the space a light source (10a, 10b) and a reflector (13a, 13b) are arranged such that light emitted by the light source (10a, 10b) is redirected by the reflector (13a, 13b) and emitted primarily towards a reflective side (14) of the optically reflecting layer (11). The reflector (13a, 13b) is arranged to emit a portion of the light directly towards the light-transmissive layer (12). Furthermore, the reflector (13a, 13b) may comprise optically specular portions (20a, 20b, 31) and optically diffusive portions (18, 32, 33, 34, 35) arranged such that a larger surface fraction of the reflector (13a, 13b) comprises diffusive surface portions closer to the optically reflecting layer (11). |
| 主权项 |
1. A light-emitting device, comprising:
an optically reflecting layer having an optically reflective side; a light-transmissive layer arranged substantially in parallel with and spaced apart from the optically reflective side of the optically reflecting layer; a light source arranged in a space between the optically reflecting layer and the light-transmissive layer; and a reflector arranged between the optically reflective side of the optically reflecting layer and the light source, and configured in such a way that light emitted by the light source is reflected towards the optically reflective side of the optically reflecting layer, wherein the reflector is further configured in such a way that a fraction of the light emitted by the light source is reflected by the reflector directly towards the light-transmissive layer, wherein the reflector comprises a first surface portion and a second surface portion, the second surface portion being closer to the light source than the first surface portion, and the first surface portion being closer to the optically reflecting layer than the second surface portion, and wherein a fraction of light reflected towards the light-transmissive layer by the first surface portion is larger than a fraction of light reflected towards the light-transmissive layer by the second surface portion. |
