Light emissive panel unit
First Claim
Patent Images
1. A light emissive panel unit comprising:
- light source means for emitting light;
a prism plate having first and second main surfaces, the light emitted by said light source means being incident on the first main surface, a first part of the incident light being reflected by the first main surface and a second part of the incident light passing through said prism plate and being emitted from the second main surface thereof; and
adjusting means for adjusting the relative amounts of the first and the second parts of the incident light, and thereby the amount of light emitted from the second main surface of said prism plate, as a function of a distance of a location along the second main surface of said prism plate at which the emitted light is incident on the first main surface, said adjusting means being provided on the first surface of said prism plate.
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Abstract
A light emissive panel unit includes a light source for emitting light, a prism plate into which the light emitted by the light source means incident, a part of the light being reflectable and another part of the light passing through the prism plate, and an adjusting element for partially adjusting an amount of light emitted from a surface of the prism plate.
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Citations
35 Claims
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1. A light emissive panel unit comprising:
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light source means for emitting light; a prism plate having first and second main surfaces, the light emitted by said light source means being incident on the first main surface, a first part of the incident light being reflected by the first main surface and a second part of the incident light passing through said prism plate and being emitted from the second main surface thereof; and adjusting means for adjusting the relative amounts of the first and the second parts of the incident light, and thereby the amount of light emitted from the second main surface of said prism plate, as a function of a distance of a location along the second main surface of said prism plate at which the emitted light is incident on the first main surface, said adjusting means being provided on the first surface of said prism plate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A light emissive panel unit comprising:
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light source means for emitting light; a prism plate having first and second main surfaces, the light emitted by said light source means being incident on the first main surface, a first part of the incident light being reflected by the first main surface and a second part of the incident light passing through said prism plate and being emitted from the second main surface thereof; and adjusting means for adjusting the relative amounts of the first and the second parts of the incident light, and thereby the amount of light emitted from the second main surface of said prism plate, as a function of the distance, along the second main surface of said prism plate from the light source means, at which the emitted light source is incident on the first main surface and so as to cause the second part of the incident light, passing through said prism plate and being emitted from the second main surface thereof, to be of a substantially uniform intensity across the second main surface thereof, said adjusting means further comprising reflecting means for reflecting light and defining a space between the first main surface of said prism plate and said reflecting means, which space decreases progressively at distances progressively farther removed from the light source, wherein the light emitted from said light source means into the space between said prism plate and said reflecting means is repeatedly reflected by and between said first main surface of said prism plate and the reflecting means and thereby a first part of the incident light is confined in the space and a second part of the incident light is emitted from the second main surface of said prism plate. - View Dependent Claims (33, 34, 35)
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Specification