Device for improved illumination efficiency
First Claim
1. An illumination system for a ceiling structure of an airplane having at least a first row of stowage bins adjacent said ceiling structure, said illumination system comprising:
- a. an illumination device placed adjacent said ceiling structure and opposite said first row of stowage bins, said illumination device further comprising a lighting source fixture;
b. a light emitting diode attached to said lighting source fixture wherein said light emitting diode is subject to a line of sight height restriction for illuminating a stowage bin positioned opposite said lighting source fixture;
c. a beam forming optic coupled to said light emitting diode;
d. a height limiting aperture placed in the path of an output beam formed by said coupled optic and light emitting diode configured to limit the height of the output beam and maintain efficient optical coupling whereby said aperture is offset from an optical center of said illumination device thereby limiting the height and enhancing the relative intensity of a coupled beam and thereby providing an efficient beam forming optical light emitting diode device configured with a larger area of illumination from the beam-forming optics than an area allowed by the line-of-sight restriction, thereby providing an increase in optical coupling efficiency.
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Accused Products
Abstract
Interior lighting and illumination systems for aircraft, particularly commercial passenger airplanes. Efficient beam forming optical light emitting diode arrangements having offset apertures for maximizing effectiveness are positioned in the ceiling panels above the aisles between sets of seats in the passenger cabins for cross bin illumination of stowage areas. The efficient beam forming optical LED devices are positioned to shine on opposite storage/stowage bins and are positioned to overcome line of height light source restrictions such as may be imposed by a valence. The devices are effective for illuminating across the aisles, thus creating a cross-bin lighting system.
50 Citations
18 Claims
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1. An illumination system for a ceiling structure of an airplane having at least a first row of stowage bins adjacent said ceiling structure, said illumination system comprising:
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a. an illumination device placed adjacent said ceiling structure and opposite said first row of stowage bins, said illumination device further comprising a lighting source fixture; b. a light emitting diode attached to said lighting source fixture wherein said light emitting diode is subject to a line of sight height restriction for illuminating a stowage bin positioned opposite said lighting source fixture; c. a beam forming optic coupled to said light emitting diode; d. a height limiting aperture placed in the path of an output beam formed by said coupled optic and light emitting diode configured to limit the height of the output beam and maintain efficient optical coupling whereby said aperture is offset from an optical center of said illumination device thereby limiting the height and enhancing the relative intensity of a coupled beam and thereby providing an efficient beam forming optical light emitting diode device configured with a larger area of illumination from the beam-forming optics than an area allowed by the line-of-sight restriction, thereby providing an increase in optical coupling efficiency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for illuminating a ceiling structure of an airplane having at least a first row of stowage bins adjacent said ceiling structure, said method comprising:
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a. placing an illumination device adjacent said ceiling structure and opposite said first row of stowage bins, said illumination device further comprising a lighting source fixture; b. attaching a light emitting diode to said lighting source fixture wherein said light emitting diode is subject to a line of sight height restriction for illuminating a stowage bin positioned opposite said lighting source fixture; c. coupling a beam forming optic to said light emitting diode; d. placing a height limiting aperture in the path of an output beam formed by said coupled optic and light emitting diode, whereby the beam forming optic provides a larger area of illumination than an area allowed by the line of sight height restriction thereby providing an increase in optical coupling efficiency, and e. offsetting said aperture from the optical center of said illumination device thereby coupling said beam by offsetting the aperture from an optical center of the device, limiting the height of said coupled beam, and enhancing the relative intensity of said coupled beam, thereby providing an efficient beam forming optical light emitting diode device having a larger area of illumination than allowed by the line-of-sight restriction, thereby providing an increase in optical coupling efficiency effective for aircraft cabin illumination. - View Dependent Claims (17, 18)
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Specification