Illuminating member for reducing unified glare rating and lighting device using the same
First Claim
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1. A lighting device, comprising:
- a printed circuit board with a light source;
a frame portion formed around a region at which the light source is disposed; and
an illuminating member, wherein the illumination member comprises a diffusion plate, an optical plate over the diffusion plate, an adhesion layer, and an air gap between the diffusion plate and the optical plate;
wherein the adhesion layer is disposed on an edge of the diffusion plate;
wherein the frame portion includes a first frame accommodating the printed circuit board, and a second frame connected with the first frame and accommodating an insertion portion;
wherein a part of the illuminating member having the adhesion layer is inserted into the insertion portion,wherein the adhesion layer is in direct contact with the diffusion plate and the optical plate,wherein the optical plate includes a plurality of micro lens patterns, and a sag of each of the micro lens patterns is in a range of 0.1˜
0.25, the sag being defined as a ratio between a height of the corresponding micro lens pattern and a diameter of the same micro lens pattern, and a fill factor of each of the micro lens pattern is in a range of 0.5˜
0.82, wherein the fill factor is defined as a proportion of an area occupied by the corresponding micro lens pattern to a total area of one surface of the optical plate; and
wherein the adhesion layer has a width greater than the diameter of each of the micro lens patterns.
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Abstract
Disclosed is a lighting device capable of reducing UGR (Unified Glare Rating). in a illuminating member, reflection efficiency of light significantly scattering to the left and right among light applied to the air gap through the diffusion plate is increased using the adhesion material pattern layer of periphery surrounding an air gap, and simultaneously, the UGR may be reduced by removing the process disposing the pattern with a specific structure and increasing the process efficiency.
13 Citations
15 Claims
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1. A lighting device, comprising:
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a printed circuit board with a light source; a frame portion formed around a region at which the light source is disposed; and an illuminating member, wherein the illumination member comprises a diffusion plate, an optical plate over the diffusion plate, an adhesion layer, and an air gap between the diffusion plate and the optical plate; wherein the adhesion layer is disposed on an edge of the diffusion plate; wherein the frame portion includes a first frame accommodating the printed circuit board, and a second frame connected with the first frame and accommodating an insertion portion; wherein a part of the illuminating member having the adhesion layer is inserted into the insertion portion, wherein the adhesion layer is in direct contact with the diffusion plate and the optical plate, wherein the optical plate includes a plurality of micro lens patterns, and a sag of each of the micro lens patterns is in a range of 0.1˜
0.25, the sag being defined as a ratio between a height of the corresponding micro lens pattern and a diameter of the same micro lens pattern, and a fill factor of each of the micro lens pattern is in a range of 0.5˜
0.82, wherein the fill factor is defined as a proportion of an area occupied by the corresponding micro lens pattern to a total area of one surface of the optical plate; andwherein the adhesion layer has a width greater than the diameter of each of the micro lens patterns. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification