Spread illuminating apparatus having light converging means
AssigneeMinebea Co., Ltd.
InventorsAtsushi Kitamura, Shingo Suzuki
Life of this patent
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Abstract
A spread illuminating apparatus includes a light converging element which has a refractive index profile in a direction orthogonal to two major surfaces of a light conductive plate, and which is disposed between at least one light source and one end surface of the light conductive plate. The light converging element comprises: a plurality of transparent resin films which have respective refractive indexes so as to constitute a refractive index gradation mirror-imaged with respect to the center plane of the light converging element, and which are layered over one another; and a plurality of light-transmittable adhesive layers each of which is sandwiched between two adjacent transparent resin films.
Claims10
A spread illuminating apparatus comprising:
- at least one light source;
- a light conductive plate which has the at least one light source disposed so as to face toward one end surface thereof, and which allows light emitted from the at least one light source and introduced thereinto to exit out from at least one of two major surfaces thereof respectively toward at least one object to be illuminated;
- and
- a light converging means which has a refractive index profile in a direction orthogonal to the two major surfaces of the light conductive plate, and which is disposed between the at least one light source and the one end surface of the light conductive plate.
Dependencies are inferred from the claim text.