Lighting panel for a display
AssigneeCitizen Electronics Co., Ltd.
InventorsJunji Miyashita, Kenji Matsumoto
Life of this patent
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Abstract
There is provided a lighting panel having rectangular both surfaces one of which is a reflection surface and the other is a discharge surface, an edge light provided at a corner of the lighting panel. A plurality of prisms are circularly formed on the reflection surface of the lighting panel. Each of the prisms has a vertical angle θ comprising a first inclination angle θ1 on the edge light side and a second inclination angle θ2 opposite to the first inclination angle θ1. The first inclination angle θ1 is set to 89.5°˜60°, and there is a following relationship between the first inclination angle θ1 and the second inclination angle θ2: θ1(θ1.1˜θ1.n)>θ2 θ1.1≦θ1.2≦ . . . θ1.(m−1)≦θ1.m . . . θ1.(n−1)≦θ1.n
Claims4
A panel for lighting a display comprising:
- a lighting panel made of a transparent plastic and having rectangular both surfaces one of which is a reflection surface and the other is a discharge surface;
- an incident surface formed by beveling one of corners of the lighting panel;
- an edge light provided corresponding to the incident surface;
- a plurality of prisms circularly formed on the reflection surface of the lighting panel;
- edge lines of the prisms being concentrically arranged with the edge light at a predetermined interval;
- each of the prisms having a vertical angle θ comprising a first inclination angle θ1(θ1.1˜θ1.n) on the edge light side and a second inclination angle θ2 opposite to the first inclination angle θ1;
- wherein the first inclination angle θ1 is set to 89.5°˜60°, and there is a following relationship between the first inclination angle θ1 and the second inclination angle θ2:
- θ1(θ1.1˜θ1.n)>θ2θ1.1≦θ1.2≦ . . . θ1.(m−1)≦θ1.m . . . θ1.(n−1)≦θ1.n
Dependencies are inferred from the claim text.