Optical: systems and elements – Glare or unwanted light reduction
Reexamination Certificate
1985-10-10
2002-10-22
Buczinski, Stephen C. (Department: 3662)
Optical: systems and elements
Glare or unwanted light reduction
C250S2140LA, C340S815410, C340S945000, C345S008000, C359S229000, C359S635000
Reexamination Certificate
active
06467914
ABSTRACT:
FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not Applicable.
BACKGROUND OF THE INVENTION
1. Technical Field
This invention relates to electronic passive night vision aids and to a system for operating such night vision aids in conjunction with a local display such as a cockpit display. More particularly, the invention relates to an electronic night vision aid which amplifies light and may be used with a local display. A typical local display used with this invention is a head down display (HDD) used to provide instrumentation and other data to the viewer. It is intended that the local display may be viewed either with or without the night vision aid in use.
2. Background Art
Passive night vision aids such as ambient or aviator's night vision (ANVIS) goggles are becoming popular in the military aircraft cockpit setting. The increased popularity of such night vision goggles and other passive night vision aids creates unique problems with illumination of cockpit displays. These passive night vision aids operate by amplifying available light, particularly in the longer wavelengths of visible light. In the upper infrared ranges, illumination from cockpit display sources overwhelms sensor elements which are used in such night vision aids, and thereby interrupts the night vision aid for up to several minutes.
It is important that the display indicators remain illuminated, not only for the benefit of the crewmen who are not wearing night vision aids, but also because those using the goggles will typically view the instruments by looking under the goggles.
In an attempt to alleviate this problem of cockpit displays overwhelming ANVIS devices, attempts have been made to filter the light from these display sources to restrict illumination to wavelengths not normally received by the night vision goggles. Filtration of the objectionable light must be very efficient because small amounts of light within the active frequency range of the night vision aid will overwhelm the aid. This becomes difficult due to the close proximity of the night vision aid to the illuminated indicators.
Conventional passive night vision aids are sensitive to light having wavelengths of 580 nanometer (nM) or longer. This means that illumination of displays at shorter wavelengths (frequencies above the frequency range of the passive night vision aids) will not substantially interfere with the night vision aids and will facilitate the use of such night vision aids. The selective filtration of light according to wavelength generally prevents the use of full color displays. This is because frequencies at the lower end of the visible spectrum overlap with those frequencies which are received by the night vision goggles.
It is accordingly desired that a night vision aid such as ANVIS goggles be operable while a full color display is presented in the vicinity of the goggles. In particular, it is desired to operate ANVIS goggles in a cockpit or similar environment in which a full color display is illuminated. It is therefore desired to prevent light which originates at the full color display from overwhelming the night vision aid.
SUMMARY OF THE INVENTION
In accordance with the present invention, an ANVIS aid, such as an ANVIS goggles set, is provided with an optical filter. A second optical filter blocking light in an opposite sense from the first optical filter is placed over displays, which may otherwise present light that would interfere with the ANVIS.
Advantages include increased flexibility in use of ANVIS devices and ability to operate full color displays when ANVIS devices are being used.
REFERENCES:
patent: 2308704 (1943-01-01), MacNeil
patent: 2540943 (1951-02-01), Hales
patent: 2955231 (1960-10-01), Aiken
patent: 3245315 (1966-04-01), Marks et al.
patent: 3373506 (1968-03-01), Davidoff
patent: 3449583 (1969-06-01), Eden
patent: 3479454 (1969-11-01), Wolff
patent: 3517122 (1970-06-01), Owen
patent: 3602573 (1971-08-01), Kermode
patent: 3617997 (1971-11-01), Maass et al.
patent: 3704061 (1972-11-01), Travis
patent: 3812526 (1974-05-01), Tan
patent: 3840731 (1974-10-01), Saufferer
patent: 3955190 (1976-05-01), Teraishi
patent: D253177 (1979-10-01), Litman
patent: 4170772 (1979-10-01), Bly
patent: 4190832 (1980-02-01), Mohler
patent: 4201450 (1980-05-01), Trapani
patent: 4229066 (1980-10-01), Rancourt et al.
patent: 4374325 (1983-02-01), Howorth
patent: 4376889 (1983-03-01), Swift
patent: 4425600 (1984-01-01), Barnhart
patent: 4449787 (1984-05-01), Burbo et al.
patent: 4463252 (1984-07-01), Brennan et al.
patent: 4473277 (1984-09-01), Brown
patent: 4488786 (1984-12-01), Caramel
patent: 4495520 (1985-01-01), Kravitz et al.
patent: 4515442 (1985-05-01), Aron
patent: 4560233 (1985-12-01), Banbury
patent: 5175651 (1992-12-01), Marron et al.
patent: 5268788 (1993-12-01), Fox et al.
patent: 5438452 (1995-08-01), Gruber
patent: 5617080 (1997-04-01), Morich
patent: 33 13899 (1984-10-01), None
patent: 9332 (1980-04-01), None
patent: 1605139 (1982-01-01), None
patent: WO 9943547 (1999-09-01), None
Pave Low III, Interior Lighting Reconfiguration for Night Lighting and Night Vision Goggle Compatibility, H. L. Task; L.L. Griffin, Human Engineering Division, Aerospace Medical Research Laboratory, Wright-Patterson, AFB, Ohio, pp. 106-116.
The Night Vision Goggle Compatible Helicopter Cockpit, Dr. H.-D.V. Boehm, Messerschmitt-Beolkow-Blohm GmbH Munich, Germany, Tenth European Rotocraft Forum, Aug. 28-31, 1984.—The Hauge, The Netherlands.
North Atlantic Treaty Organization, Military Agency for Standardization (MAS), Standardization Agreement, Night Vision Goggle Lighting Compatibility Design Criteria, Oct. 16, 1985, M. Korkolis.
North Atlantic Treaty Organization, Advisory Group for Aerospace Research and Development (Organisation Du Traite De L'Atlantique Nord); AGARD Conference Proceedings No. 379, Visual Protection and Enhancement, pp. 5-1-5-11.
C. E. Rash, et al. “Compatibility of Aircraft Cockpit Lighting and Image Intensification Night Imaging Systems”, Optical Engineering, US, SOC. of Photo-Optical Instrumentation Engineers, Bellingham, vol. 29, No. 8, Aug. 1, 1990, pp. 863-869, XP000141200, ISSN: 0091-3286.
Cohen Richard L.
Scoughton Craig R.
Buczinski Stephen C.
Honeywell International , Inc.
Yeadon Loria B.
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