Light device, particularly a light panel for road signs or information to the public, or a motor-vehicle light
A light device, for example in the form of a light panel for road signals or in the form of a motor-vehicle light, comprises an array of light sources, such as LEDs or the like. Associated to each light source is an optical system consisting of a refractive lens of a plane-convex type having a plane face facing the light source, in which a diffuser of a refractive or diffractive micro-optical type is incorporated.
1. A light device, comprising a panel bearing an array of light sources, or clusters of light sources, and an optical system for controlling the light beam at output from said light sources,
wherein the optical system is set in front of each light source for controlling the radiation emitted by the light source, said optical system including an off-axis refractive lens or off-axis Fresnel lens having a first face, which is planar and is set facing the light source, and a second face, wherein said first face incorporates a diffuser of a refractive or diffractive micro-optical type, which covers at least part of the surface of said first face, and wherein set between the light source and the optical system is a system of diaphragms or a tubular element eqiuvalent thereto for absorption of the solar radiation that comes from outside and is transmitted by the optical system into said absorbent system.
2. The light device according to claim 1 , wherein said diffuser of a micro-optical type consists of an array of micro-optical systems, for example an array of cylindrical microlenses.
3. The light device according to claim 2 , wherein the diffuser of a micro-optical type consists of an array of cylindrical microlenses alternating with plane portions.
4. The light device according to claim 1 , wherein the first plane face is oblique with respect to the optical axis of the light source.
5. The light device according to claim 1 , wherein the surface of the second face incorporates a diffusive strip.
6. The light device according to claim 1 , wherein the second face has a curved surface with a constant radius of curvature.
7. The light device according to claim 1 , wherein the second face has a curved non-spherical surface.
8. The light device according to claim 1 , wherein the second face has a segmented Fresnel surface with an off-axis section.
9. The light device according to claim 1 , wherein the first plane face is substantially orthogonal to the optical axis of the light source.
10. The light device according to claim 1 , wherein set between the light source and the optical system is a lens for collimating the light beam coming from the light source.
11. A light panel for road signals according to claim 1 .
12. A light panel for information to the public according to claim 1 .
13. A motor-vehicle light, according to claim 1 .
14. A light device, comprising a panel bearing an array of light sources, or clusters of light sources, and an optical system for controlling the light beam at output from said light sources,
wherein the optical system is set in front of each light source for controlling the radiation emitted by the light source, said optical system including an off-axis refractive lens or off-axis Fresnel lens having a first face, which is planar and is set facing the light source, and a second face, wherein said first face incorporates a diffuser of a refractive or diffractive micro-optical type, which covers at least part of the surface of said first face, and wherein said second face is curved.