Patent US2323328A successfully refreshed from Google Patents.
Patent US4060307A successfully refreshed from Google Patents.
US4060307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Face plate graticule
Assignee: Rank Organization Ltd
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Filing: 1976-04-30
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Granted: 1977-11-29
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Expires: 1996-04-30
Abstract
Abstract In an optical display system, information recorded on a face plate or like optical element is injected into a main optical path by means of a standby sight device comprising a lens unit and a flexible fibre optic bundle having a numerical aperture sufficiently large to cover the maximum acceptance angle of the lens unit.
Inventors
- 👤 David George Anthony Demaine
- 👤 David Gordon Norrie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:16
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/32; G02B27/34
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
131 words
In an optical system having a stand-by sight device comprising a flexible fibre optic bundle, a light input unit at one end of the bundle, a fibre distributing element at the other end of the bundle, and a graticule on the output face of the distributing element, and a lens unit through which an image of the graticule is projected via a combining mirror into the user's field of view, the improvement that the distributing element has a face plate having an outer face with which the output ends of the fibres are coplanar and on which is deposited a dark ground graticule, the face plate bearing the graticule and the flexible fibre optic bundle having a numerical aperture sufficiently large to cover the maximum acceptance angle of the lens unit.
Claim 2
Dependent Claim
131 words
In an optical system having a stand-by sight device comprising a flexible fibre optic bundle, a light input unit at one end of the bundle, a fibre distributing element at the other end of the bundle, and a graticule on the output face of the distributing element, and a lens unit through which an image of the graticule is projected via a combining mirror into the user's field of view, the improvement that the distributing element has a face plate having an outer face with which the output ends of the fibres are coplanar and on which is deposited a dark ground graticule, the face plate bearing the graticule and the flexible fibre optic bundle having a numerical aperture sufficiently large to cover the maximum acceptance angle of the lens unit.
Claim 3
Dependent Claim
25 words
An optical system according to claim 1, wherein the output ends of the fibres in the distributing element are selectively grouped behind the graticule markings.
Claim 4
Dependent Claim
48 words
An optical system according to claim 1, wherein the fibre distributing element comprises an element in which the optical fibres leading from the other end of the bundle are encapsulated to distribute the output ends of the fibres over the area of the face plate bearing the graticule.
Claim 5
Dependent Claim
37 words
An optical system according to claim 1, wherein the light input unit comprises a lamp, and a clad rod integrator and a colour filter interposed between the lamp and the input end of the fibre optic bundle.
Claim 6
Dependent Claim
48 words
An optical system according to claim 1, wherein the face plate on the distributing element comprises a slotted mask, the output ends of the fibres terminating in the slots flush with the face of the mask and the dark ground graticule being deposited directly on said mask face.
Claim 7
Dependent Claim
112 words
In a head-up display having a stand-by sight device comprising a flexible fibre optic bundle, a light input unit at one end of the bundle, a fibre distributing element at the other end of the bundle, and a graticule on the output face of the distributing element, and a lens unit through which an image of the graticule is projected into the pilot's field of view, the improvement that the distributing element has a face plate in the form of a slotted mask, the output ends of the fibres terminating in the slots and the outer face of the mask, and a dark ground graticule being directly deposited on said mask face.
Claim 8
Dependent Claim
112 words
In a head-up display having a stand-by sight device comprising a flexible fibre optic bundle, a light input unit at one end of the bundle, a fibre distributing element at the other end of the bundle, and a graticule on the output face of the distributing element, and a lens unit through which an image of the graticule is projected into the pilot's field of view, the improvement that the distributing element has a face plate in the form of a slotted mask, the output ends of the fibres terminating in the slots and the outer face of the mask, and a dark ground graticule being directly deposited on said mask face.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-28 | 1981-05-30 | 1981-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-28 | 1985-05-30 | 1985-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-28 | 1989-05-30 | 1989-11-29 | $7700.00 | Window Closed / Lapsed |