White-LED luminous signalling device
First Claim
1. A luminous signalling device comprising:
- a body made of transparent synthetic material, basically in the form of a plate having two larger faces set opposite to one another, at least one of which bears an image, two end walls, and two longitudinal walls;
a plurality of LED devices, part of which designed to emit white light, and part of which designed to emit green light, externally coupled to at least one of said end walls or said longitudinal walls, the arrangement being such that the rays of white light coming out of said LED devices undergo multiple total reflections within the plate body, which thus functions as a light guide; and
a distribution of diffusing, diffractive optical elements formed on the face bearing the image in areas corresponding to selected areas of the image designed to diffuse outwards the rays of light that are incident on said areas from within the plate.
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Abstract
A luminous signalling device comprises a body made of transparent synthetic material, basically in the form of a plate having two larger faces set opposite one another, at least one of which carries an image. A plurality of LED devices of the SMD type which emit white light is coupled externally to at least one of the walls that define the peripheral edge of the aforesaid plate body. The arrangement is such that the rays of white light coming out of the LED devices undergo multiple total reflections within the plate body, which thus functions as a light guide. In areas corresponding to selected areas of the image, the face of the plate body is made up of diffusing optical elements designed to diffuse outwards the rays of light that are incident on said areas within the body.
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Citations
15 Claims
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1. A luminous signalling device comprising:
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a body made of transparent synthetic material, basically in the form of a plate having two larger faces set opposite to one another, at least one of which bears an image, two end walls, and two longitudinal walls;
a plurality of LED devices, part of which designed to emit white light, and part of which designed to emit green light, externally coupled to at least one of said end walls or said longitudinal walls, the arrangement being such that the rays of white light coming out of said LED devices undergo multiple total reflections within the plate body, which thus functions as a light guide; and
a distribution of diffusing, diffractive optical elements formed on the face bearing the image in areas corresponding to selected areas of the image designed to diffuse outwards the rays of light that are incident on said areas from within the plate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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- 14. A luminous signalling device comprising a panel bearing an image, said panel being formed with diffusing prisms in areas corresponding to selected areas of the image, and a plurality of white-light emitting LEDs supported in such a way that they diffuse the corresponding cones of light on said selected areas of the image, said diffusing prisms having a solid angle of light diffusion, the central axis of which is inclined with respect to an axis normal to the panel.
Specification