Light emitting device with two linear light emitting sections
First Claim
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1. A light emitting device comprising:
- a. a first tube with a first linear section comprising a first linear array of light emitting diodes in a first direction with an optical axis and a density greater than 5 light emitting diodes per linear inch, the first tube comprising a first light transmitting cover positioned to receive and emit light from the first linear array of light emitting diodes;
b. a second tube with a second linear section comprising a second linear array of light emitting diodes in a second direction with a density greater than 5 light emitting diodes per linear inch, the second tube is separated from the first tube in a third direction orthogonal to the first direction, the second linear section of the second tube is substantially parallel to the first linear section of the first tube, the second tube comprising a second light transmitting cover positioned to receive and emit light from the second linear array of light emitting diodes; and
c. a third tube physically coupled to the first tube and second tube,wherein a luminance uniformity along the first direction measured at a light emitting surface of the first light transmitting cover of light from the first linear array of light emitting diodes is greater than 60%, and a luminance uniformity along the second direction measured at a light emitting surface of the second light transmitting cover of the light from the second linear array of light emitting diodes is greater than 60%.
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Abstract
In one embodiment, a light emitting device comprises two tubes comprising linear arrays of light emitting diodes physically coupled by a third tube. In one embodiment, the third tube comprises a linear array of light emitting diodes. In another embodiment, the first tube, second tube, and third tube of the light emitting device are positioned to substantially form the shape of a character “U” in a plane perpendicular to the optical axis. In another embodiment, the first linear array of light emitting diodes has an average spacing between the light emitting diodes, and a ratio of the first, shorter dimension of the light emitting diodes to the average spacing is between 1 and 3.
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Citations
20 Claims
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1. A light emitting device comprising:
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a. a first tube with a first linear section comprising a first linear array of light emitting diodes in a first direction with an optical axis and a density greater than 5 light emitting diodes per linear inch, the first tube comprising a first light transmitting cover positioned to receive and emit light from the first linear array of light emitting diodes; b. a second tube with a second linear section comprising a second linear array of light emitting diodes in a second direction with a density greater than 5 light emitting diodes per linear inch, the second tube is separated from the first tube in a third direction orthogonal to the first direction, the second linear section of the second tube is substantially parallel to the first linear section of the first tube, the second tube comprising a second light transmitting cover positioned to receive and emit light from the second linear array of light emitting diodes; and c. a third tube physically coupled to the first tube and second tube, wherein a luminance uniformity along the first direction measured at a light emitting surface of the first light transmitting cover of light from the first linear array of light emitting diodes is greater than 60%, and a luminance uniformity along the second direction measured at a light emitting surface of the second light transmitting cover of the light from the second linear array of light emitting diodes is greater than 60%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A light emitting device comprising:
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a. a first linear tube section comprising a first linear array of light emitting diodes arrayed in a first direction orthogonal to an optical axis of the light emitting diodes, the light emitting diodes of the first linear array of light emitting diodes have a first dimension in the first direction shorter than a second dimension in a direction orthogonal to the optical axis and the first direction; b. a second linear tube section oriented parallel to the first linear tube section comprising a second linear array of light emitting diodes arrayed in a second direction, the second linear tube section separated from the first linear tube section by at least 1.5 inches in a third direction orthogonal to the first direction; and c. a third tube section coupled to the first linear tube section and the second linear tube section, wherein the first linear array of light emitting diodes has an average spacing between the light emitting diodes, and a ratio of the first dimension to the average spacing is between 1 and 3. - View Dependent Claims (17, 18, 19)
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20. A method of manufacturing a light emitting device comprising:
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a. positioning a first linear array of light emitting diodes in a first direction on a first circuit board in a first tube such that the first linear array of light emitting diodes has an average pitch less than 6 millimeters in the first direction; b. positioning a second linear array of light emitting diodes in a second direction parallel to the first direction on a second circuit board in a second tube; c. spacing the first tube from the second tube in a third direction orthogonal to the first direction; d. operatively coupling the third tube to the first tube and the second tube; and e. positioning a first light transmitting cover to receive and emit light from the first linear array of light emitting diodes and positioning a second light transmitting cover to receive and emit light from the second linear array of light emitting diodes such that a luminance uniformity along the first direction measured at a light emitting surface of the first light transmitting cover of light from the first linear array of light emitting diodes is greater than 60%, and a luminance uniformity along the second direction measured at a light emitting surface of the second light transmitting cover of light from the second linear array of light emitting diodes is greater than 60%.
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Specification