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| Luminaire lens |
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Airway obstruction luminaire
| Details |
Inventors: Northrup, Richard M.; Mandeville, George J.;
Assignee: Flash Technology Corporation of America (Franklin, TN)
Primary Examiner: Schuberg; Darren E.
Assistant Examiner: Assaf; Fayez
Attorney, Agent or Firm: Weins; Michael J., Semprebon; Jeffrey E.
An airway obstruction luminaire has a luminaire base; a substantially cylindrical Fresnel lens having a lens axis; a halogen lamp having a lamp base, and a substantially linear filament; and a lamp bracket which positions the lamp such that a filament axis of the filament is coincident with the lens axis. The filament is energized by a power supply connected to a first filament end and second filament end, which are separated by an effective length l.sub.E of less than 1 inch. The filament is preferably formed as a helical coil. The lamp is designed to operate at a lamp rated voltage V.sub.L between about 12 and 30 volts. The power supply voltage V.sub.P is reduced if V.sub.P is greater than V.sub.L. The second filament end is supported by a second end support structure configured to reduce shadowing. The lens is preferably an acrylic plastic lens fabricated by injection molding. The axial position of the lamp with respect to the lens may be adjusted by placing shims between the lamp base and the lamp bracket. The luminaire may be designed to meet the FAA requirements for type L-810 or type L-864 devices, and in the latter case is provided with a flashing circuit for periodically interrupting power to the lamp. |
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DETAILED DESCRIPTION What is claimed is: 1.
A luminaire which operates under a power W provided by a power supply the luminaire comprising: a luminaire base; a substantially cylindrical Fresnel lens which attaches to said luminaire base, said substantially cylindrical Fresnel lens having a lens axis and being bounded by a surface of revolution about said lens axis and having a mean lens diameter D; a halogen lamp residing in said substantially cylindrical Fresnel lens, said halogen lamp having a lamp rated voltage V.
sub.
L which is between about 12 volts and 30 volts and further having, a lamp base, a lamp envelope which attaches to said lamp base, a substantially linear filament residing in said lamp envelope, said substantially linear filament being constructed from a filament wire terminating in a first filament end and a second filament end, with said first filament end being closer to said lamp base than said second filament end, said filament wire having a gauge g and a wire length l.
sub.
W and being configured such that said substantially linear filament has a filament axis which is substantially parallel to said lens axis and has an effective length l.
sub.
E which is the linear distance between said first filament end and said second filament end, said substantially linear filament being formed as a helical coil having a coil diameter d and a coil height h, said coil height h being said effective length l.
sub.
E, the ratio D/d being greater than about 40, and the ratio h/d being greater than about 21/2, and said effective length l.
sub.
E being less than about 1 inch a first end filament lead attaching to said first filament end and said lamp base and communicating with the power supply, and a second end support structure attaching to said second filament end and said lamp base and communicating with the power supply; and a lamp bracket attaching to said luminaire base and to said lamp base, said lamp bracket being configured such that said filament axis is substantially coincident with said lens axis
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