US4222027A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glide path lighting system
Assignee: US Philips Corp
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Filing: 1977-05-17
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Granted: 1980-09-09
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Expires: 1997-05-17
Abstract
Abstract Disclosed is a glide path lighting system which is provided with a lens, a light source, and a screen whether or not constructed as a color filter disposed in the focal plane of the lens between the lens and the light source. The lens is provided with a diaphragm having an opening which is wider in the horizontal direction than in the vertical direction.
Inventors
- 👤 Johannes C. J. Mikkers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:25
CPC Classifications
B; B64; B64F; B64F1/00; B64F1/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
146 words
An aircraft glide path lighting system comprising a light source, a lens spaced from said light source, the focal plane of said lens being located at a position between said lens and said light source, a screen disposed in said focal plane on at least one side of the optical axis of said lighting system, said screen cooperating with said lens and said light source to render visible to an operator of an approaching aircraft light of a predetermined color when the glide path of the aircraft is within a predetermined angle with respect to said optical axis, and a diaphragm disposed between said lens and said screen for masking a peripheral portion of said lens, said diaphragm having a noncircular opening which is wider in the horizontal direction than in the vertical direction to reduce dispersion and aberration of said lens in the vertical plane.
Claim 2
Dependent Claim
146 words
An aircraft glide path lighting system comprising a light source, a lens spaced from said light source, the focal plane of said lens being located at a position between said lens and said light source, a screen disposed in said focal plane on at least one side of the optical axis of said lighting system, said screen cooperating with said lens and said light source to render visible to an operator of an approaching aircraft light of a predetermined color when the glide path of the aircraft is within a predetermined angle with respect to said optical axis, and a diaphragm disposed between said lens and said screen for masking a peripheral portion of said lens, said diaphragm having a noncircular opening which is wider in the horizontal direction than in the vertical direction to reduce dispersion and aberration of said lens in the vertical plane.
Claim 3
Dependent Claim
48 words
A lighting system according to claim 1, wherein the horizontal distance from the center of said lens to the edge of said opening of said diaphragm is 1.2 to 2.5 times greater than the vertical distance from the center of said lens to the edge of said opening.
Claim 4
Dependent Claim
16 words
A lighting system according to claim 1, wherein said opening of said diaphragm is almond shaped.
Claim 5
Dependent Claim
15 words
A lighting system according to claim 1, wherein said opening of said diaphragm is rhombic.
References Cited (Backward Citations)
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Cited
US1605016A
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US2142297A
Cited
US3191146A
Cited
US3447129A
Cited
US3457400A
Cited
US3648229A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-09 | 1984-03-10 | 1984-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-09 | 1988-03-10 | 1988-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-09 | 1992-03-10 | 1992-09-09 | $7700.00 | Window Closed / Lapsed |