JP2008218312A5 - - Google Patents

Claims (15)

An illumination unit comprising: a light emitting diode; and a diffuser plate disposed in front of the light emitting diode, wherein the diffuser plate has a diffuse reflectance gradient pattern in which the diffuse reflectance varies depending on a location. The lighting unit according to claim 1, wherein the inclined pattern of the diffusion plate has a continuous inclination such that the diffuse reflectance decreases as the distance from the front surface of the light emitting diode increases. The illumination unit according to claim 1, wherein the inclined pattern of the diffusing plate has a gradually decreasing diffuse reflectance as the distance from the nearest front surface of the light emitting diode increases. The said diffusion plate consists of a transparent material of a polymer material, forms the fine unevenness | corrugation on the surface, The said inclination pattern was formed by changing the density of the said unevenness | corrugation according to a place. Lighting unit. The illumination unit according to claim 1, wherein the diffusion plate is made of a transparent material of a polymer material, and the inclined pattern is formed on the surface by printing light diffusion material ink with a predetermined density pattern. The lighting unit according to claim 5, wherein the light diffusing material ink is printed on the diffusion plate by ink jet printing or silk screen printing. The illumination unit according to claim 1, wherein the diffuser plate includes a plurality of micro bubbles that scatter light rays therein, and the inclined pattern is formed by changing a density of the micro bubbles depending on a location. The illumination unit according to claim 1, further comprising a housing disposed on an outer periphery of the light emitting diode and having a reflection surface for reflecting light reflected from the diffusion plate. The lighting unit according to claim 8, wherein the reflection surface formed on the housing is a diffuse reflection surface. The lighting unit according to claim 8, wherein the reflecting surface formed on the housing is a specular reflecting surface. The lighting unit according to claim 1, wherein an antireflection film is provided on a surface of the diffusion plate. 2. A fine pitch Fresnel lens or microprism having a positive optical power or a negative optical power is formed on the surface of the diffusion plate, and the density of the Fresnel lens or microprism is changed depending on the location. The lighting unit according to 1. Lighting unit according to claim 8, wherein the emission color and the reflection surface formed on the housing of the light emitting diode is characterized in that the same color. A lighting device comprising a plurality of lighting units according to claim 1 arranged in an array. The lighting device according to claim 14, wherein a second diffusion plate is installed on a front surface of the plurality of lighting units arranged and arranged with a predetermined space therebetween.