US20140160774A1 - Color mixing aviation anti-collision light - Google Patents

Color mixing aviation anti-collision light Download PDF

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Publication number
US20140160774A1
US20140160774A1 US13/706,910 US201213706910A US2014160774A1 US 20140160774 A1 US20140160774 A1 US 20140160774A1 US 201213706910 A US201213706910 A US 201213706910A US 2014160774 A1 US2014160774 A1 US 2014160774A1
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United States
Prior art keywords
light
leds
white
red
emitting diodes
Prior art date
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Abandoned
Application number
US13/706,910
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English (en)
Inventor
Philippe LAPUJADE
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Goodrich Lighting Systems Inc
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Goodrich Lighting Systems Inc
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Filing date
Publication date
Application filed by Goodrich Lighting Systems Inc filed Critical Goodrich Lighting Systems Inc
Priority to US13/706,910 priority Critical patent/US20140160774A1/en
Assigned to GOODRICH LIGHTING SYSTEMS, INC. reassignment GOODRICH LIGHTING SYSTEMS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Lapujade, Philippe
Priority to EP13195642.7A priority patent/EP2740667B1/de
Publication of US20140160774A1 publication Critical patent/US20140160774A1/en
Priority to US14/324,714 priority patent/US9487306B2/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D47/00—Equipment not otherwise provided for
    • B64D47/02—Arrangements or adaptations of signal or lighting devices
    • B64D47/06—Arrangements or adaptations of signal or lighting devices for indicating aircraft presence
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D2203/00—Aircraft or airfield lights using LEDs

Definitions

  • This invention relates generally to aviation equipment and, in particular, to aviation lights.
  • Dual-color anti-collision lights are used in numerous aviation applications, including the Royal Air Force, Australian, New Zealand, and United States Air Forces as well as numerous civilian applications.
  • dual-color ACLs incorporate a white strobe having an effective luminous intensity of 1500-2500 cd for daytime operations and a red strobe having effective luminous intensity of 150-250 cd for nighttime operations.
  • the chromaticity of the white strobe must meet the definition of “Aviation White” as defined, among other places, in Federal Acquisition Regulations (FAR) 25.1397.
  • FAR Federal Acquisition Regulations
  • the chromaticity of the red strobe must meet the definition of “Aviation Red” as defined by FAR 25.1397.
  • Conventional dual-color ACLs employ xenon flash tubes to provide the desired light output and chromaticity.
  • a first xenon flash tube is positioned at the focus of a reflector positioned behind a clear lens to provide the white strobe output.
  • a second xenon flash tube is positioned at the focus of a reflector positioned behind a red filter.
  • Conventional dual-color ACLs have a limited operational life, require a comparatively heavy high-voltage power supply to operate the flash tubes, and must contain two separate optical systems, one each for the white and red strobes.
  • LEDs Light Emitting Diodes
  • LEDs offer the advantage of improving reliability, reducing power consumption, and reducing the weight of a dual-color ACL. Achieving the desired effective luminous intensity, however, requires the use of multiple LEDs in place of a single xenon flash tube.
  • white LEDs which use a phosphor conversion to convert light output from a blue LED die into white light, exhibit a color shift with age and temperature. The effect is to cause the white LEDs to produce light that is more greenish as the phosphor deteriorates.
  • a white LED that initially has a chromaticity within the definition of Aviation White may, over time, color shift so that it is no longer in compliance with applicable regulations.
  • the present invention comprises a dual-color ACL having a first set of LEDs that emit a substantially white beam of light and a second set of LEDs that emit a substantially red beam of light.
  • the ACL is capable of being operated in two modes. In one mode, the red LEDs are excited by themselves so that the ACL produces a red beam of light having a chromaticity within the definition of Aviation Red and a luminous output of 150-250 cd. In the second mode, the white LEDs and the red LEDs are excited simultaneously to produce a white beam of light having a chromaticity within the definition of Aviation White and a luminous output of 1500-2500 cd. Operating the red LEDs in the white mode has two synergistic effects.
  • the red LEDs augment the luminous output of the white LEDs so that fewer white LEDs are required, thus saving cost and space.
  • the red LEDs shift the chromaticity of total light output toward the red region. This has the effect of compensating for the tendency of the white LEDs to become greener with age.
  • the white LEDs when new, produce light with a chromaticity that is outside the definition of Aviation White but, when color-mixed with the red LEDs, the total light output is within the definition of Aviation White. Utilizing LEDs that are arranged for color mixing also has the advantage of requiring only a single optical system as opposed to the two optical systems required by the prior art ACLs.
  • FIG. 1 is a perspective view of a prior art Anti-Collision Light
  • FIG. 2 is a side view of an Anti-Collision Light incorporating features of the present invention
  • FIG. 3 is a copy of the 1931 CIE Chromaticity Chart showing the chromaticity performance of two embodiments of an Anti-Collision Light incorporating features of the present invention
  • FIG. 4 is an enlarged view of the Aviation Red portion of the chart of FIG. 3 ;
  • FIG. 5 is an enlarged view of the Aviation White portion of the chart of FIG. 3 .
  • a conventional dual color ACL such as NATO stock number 6220-12-187-5292 (shown generally at reference 10 ) comprises a housing 12 to which is mounted a first optical unit 14 and a second optical unit 16 .
  • First optical unit 14 comprises a reflector 18 formed in the shape of a body of revolution having a parabolic or hyperbolic cross section.
  • a xenon flash tube 20 is located at the focal line of reflector 18 so that light emitted from xenon flash tube 20 is reflected out substantially parallel in all radial directions.
  • Second optical unit 16 comprises a second xenon flash tube (not shown) housed within a red optical filter 22 .
  • ACL 10 further comprises a connector 24 adapted to receive power from a dedicated power supply, connected to the aircraft's power system (typically 28 V), and a high-voltage transformer 26 which converts the input into the high-voltage necessary to operate the xenon flash tube.
  • a clear lens 28 encloses first optical unit 14 and second optical unit 16 .
  • first xenon flash tube 20 produces Aviation White light having effective luminous intensity in the range of 1500-2500 cd.
  • the second xenon flash tube produces sufficient white light so that the filtered red output will be Aviation Red having effective luminous intensity of 150-250 cd.
  • the white LEDs 34 and the red LEDs 36 are arranged in a single plane so that light from the LEDs is emitted radially outward without the use of a reflector, however, multiple rows of LEDs with or without reflectors or refractive optics are within the contemplation of the present invention. Accordingly, the invention should not be considered as limited to a particular physical structure.
  • ACL 30 further comprises a clear lens 38 and a connector 24 to connect ACL 30 to the aircraft's power supply.
  • the white LEDs outnumber the red LEDs by a ratio of approximately 4 white LEDs for every red LED, however for reasons that will be discussed more fully hereinafter, this ratio may be varied depending on the circumstances.
  • the red LEDs 36 may be any conventional red LED having sufficient luminous output and chromaticity within the definition of Aviation Red, which is defined by the following formula on the 1931 C.I.E. Chromaticity Diagram:
  • the white LEDs may be any conventional white LED having sufficient luminous output.
  • the chromaticity of the white LEDs may be, but is not necessarily within the definition of Aviation White, which is defined by the following formula on the 1931 C.I.E. Chromaticity Diagram:
  • y0 is the y coordinate of the Planckian radiator for the value of x considered.
  • FIG. 3 is a reproduction of the 1931 C.I.E. Chromaticity Diagram which depicts, in two-dimensional form, the gamut of human vision (shown at reference 40 ). Within the gamut of human vision 40 , the region known as Aviation White is shown at reference 42 in FIGS. 3 and 5 . The Planckian radiator is shown at reference 44 in FIG. 3 and a portion thereof in FIG. 5 . The region known as Aviation Red is shown at reference 46 in FIG. 3 and in FIG. 4 .
  • ACL 30 comprises an array of 46 white LEDs and 4 red LEDs.
  • ACL 30 comprises an array of 41 white LEDs and nine red LEDs.
  • the red LEDs will have a combined luminous output of less than 500 lm while the luminous output in the white mode (red and white LEDs) will have an output of at least 1000 lm. Ordinarily at least 1% of the combined light output is from the red LEDs however, 4-5%, 10%, 20% or more is possible depending on the application and the amount of red-shift desired.
  • the red LEDs were selected to have a center wavelength of 615-620 nm, other Aviation Red LEDs having a center wavelength of greater than 620 nm or less than 615 nm may be utilized if a greater impact on the y-coordinate of the combined light output is desired. Accordingly, it is intended that the invention should be limited only to the extent required by the appended claims and the rules and principles of applicable law.
  • references to direction such as “up” or “down” are intend to be exemplary and are not considered as limiting the invention and, unless otherwise specifically defined, the terms “substantially” or “approximately” when used with mathematical concepts or measurements mean within ⁇ 10 degrees of angle or within 10 percent of the measurement, whichever is greater.

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  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Led Device Packages (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
US13/706,910 2012-12-06 2012-12-06 Color mixing aviation anti-collision light Abandoned US20140160774A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US13/706,910 US20140160774A1 (en) 2012-12-06 2012-12-06 Color mixing aviation anti-collision light
EP13195642.7A EP2740667B1 (de) 2012-12-06 2013-12-04 Farbmischende luftfahrt-antikollisionsleuchte
US14/324,714 US9487306B2 (en) 2012-12-06 2014-07-07 Method of color mixing for an aviation anti-collision light

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13/706,910 US20140160774A1 (en) 2012-12-06 2012-12-06 Color mixing aviation anti-collision light

Related Child Applications (1)

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US14/324,714 Division US9487306B2 (en) 2012-12-06 2014-07-07 Method of color mixing for an aviation anti-collision light

Publications (1)

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US20140160774A1 true US20140160774A1 (en) 2014-06-12

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US13/706,910 Abandoned US20140160774A1 (en) 2012-12-06 2012-12-06 Color mixing aviation anti-collision light
US14/324,714 Active US9487306B2 (en) 2012-12-06 2014-07-07 Method of color mixing for an aviation anti-collision light

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US14/324,714 Active US9487306B2 (en) 2012-12-06 2014-07-07 Method of color mixing for an aviation anti-collision light

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EP (1) EP2740667B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140355281A1 (en) * 2012-12-06 2014-12-04 Goodrich Lighting Systems, Inc Method of color mixing for an aviation anti-collision light
US9776735B2 (en) * 2015-05-13 2017-10-03 The Boeing Company Very low profile anti collision light
US10004126B2 (en) * 2015-06-22 2018-06-19 Goodrich Lighting Systems, Inc. Lighting-system color-shift detection and correction
US11006500B1 (en) * 2020-01-17 2021-05-11 B/E Aerospace, Inc. End of life detection system for aircraft anti-collision light

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD774583S1 (en) * 2013-03-15 2016-12-20 Rosemount Aerospace Inc. Camera housing
EP3284683B1 (de) 2016-08-19 2019-07-31 Goodrich Lighting Systems GmbH Äussere luftfahrzeugbeleuchtungseinheit, hubschrauber und flugzeug
CN109519867A (zh) * 2018-11-15 2019-03-26 中国直升机设计研究所 一种双光防撞灯

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5293304A (en) 1992-06-08 1994-03-08 Godfrey Engineering Dual mode anticollision/recognition lamp for aircraft
US6244728B1 (en) 1999-12-13 2001-06-12 The Boeing Company Light emitting diode assembly for use as an aircraft position light
US6507290B1 (en) 2000-03-21 2003-01-14 Ledtronics, Inc. Light emitting diode cluster module capable for use as an aircraft forward position light source
EP1620676A4 (de) 2003-05-05 2011-03-23 Philips Solid State Lighting Beleuchtungsverfahren und -systeme
US7414546B2 (en) 2004-07-08 2008-08-19 Honeywell International Inc. White anti-collision light utilizing light-emitting diode (LED) technology
US20090010013A1 (en) * 2007-07-02 2009-01-08 Andre Hessling Light for a vehicle, particularly flash warning light for an aircraft
US7802901B2 (en) 2007-09-25 2010-09-28 Cree, Inc. LED multi-chip lighting units and related methods
US8018135B2 (en) * 2007-10-10 2011-09-13 Cree, Inc. Lighting device and method of making
DE102008029511A1 (de) 2008-06-21 2010-02-11 Airbus Deutschland Gmbh Lese- oder Spotleuchte
US8123377B2 (en) 2008-08-19 2012-02-28 Honeywell International Inc. Systems and methods for aircraft LED anti collision light
US20120155076A1 (en) * 2010-06-24 2012-06-21 Intematix Corporation Led-based light emitting systems and devices
US8796952B2 (en) * 2011-03-03 2014-08-05 Cree, Inc. Semiconductor light emitting devices having selectable and/or adjustable color points and related methods
US20140160774A1 (en) * 2012-12-06 2014-06-12 Goodrich Lighting Systems, Inc. Color mixing aviation anti-collision light

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140355281A1 (en) * 2012-12-06 2014-12-04 Goodrich Lighting Systems, Inc Method of color mixing for an aviation anti-collision light
US9487306B2 (en) * 2012-12-06 2016-11-08 Goodrich Lighting Systems, Inc Method of color mixing for an aviation anti-collision light
US9776735B2 (en) * 2015-05-13 2017-10-03 The Boeing Company Very low profile anti collision light
US10004126B2 (en) * 2015-06-22 2018-06-19 Goodrich Lighting Systems, Inc. Lighting-system color-shift detection and correction
US11006500B1 (en) * 2020-01-17 2021-05-11 B/E Aerospace, Inc. End of life detection system for aircraft anti-collision light

Also Published As

Publication number Publication date
EP2740667B1 (de) 2018-11-14
US20140355281A1 (en) 2014-12-04
US9487306B2 (en) 2016-11-08
EP2740667A3 (de) 2017-07-05
EP2740667A2 (de) 2014-06-11

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AS Assignment

Owner name: GOODRICH LIGHTING SYSTEMS, INC., ARIZONA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LAPUJADE, PHILIPPE;REEL/FRAME:029419/0467

Effective date: 20121205

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION