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EP0556042A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Wide field of view optical element

Assignee: Raytheon Co
•
Filing: 1993-02-11
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Granted: —
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Expires: 2013-02-11
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Abstract

Abstract A wide field-of-view optical element 12 suitable for use in a laser warning system including a frusto-conical refractive block of optically transparent material having a first surface 14 and a second surface 16. The first surface 14 is parallel with the second surface 16 and coaxial therewith. The radius R₁ of the first surface 14 is less than the radius R₂ of the second surface such that the sides of the element 12 are slanted. Reflective material is coated on the interior 17 of the first surface 14 for directing incident optical energy toward a detector 20 mounted at the second surface 16. Similarly, a reflective material is coated on the interior 18 of the second surface 16 for directing incident optical energy to the detector 20 via the first surface 14. The second reflective coating on the second surface is disposed between the outer periphery thereof and a nonzero distance R₃ from the center thereof to provide an aperture at which the detector 20 may be mounted.

Inventors

  • 👤 Alan W. Holmes

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-04 15:06
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/02; G01J1/04; G01J1/0407; G01J1/0474; G02; G02B; G02B13/00; G02B13/06; G08; G08B; G08B13/00; G08B13/18; G08B13/189; G08B13/19; G08B13/193; G01J1/0266; G01S; G01S7/00; G01S7/48; G01S7/4804

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 85 words
A wide field-of-view optical element comprising a block of optically transparent material having: a first surface and a second surface, said first surface being parallel with said second surface and coaxial therewith, the width R₁ of the first surface being less that the width R₂ of said second surface such that the sides of said element are slanted; first reflective means disposed at said first surface for directing incident optical energy; and second reflective means disposed at said second surface for directing incident optical energy.
Claim 2
Dependent Claim 34 words
The invention of Claim 1 wherein said second reflective means is disposed on said second surface between the outer periphery thereof and a nonzero distance R₃ from the center thereof to provide an aperture.
Claim 3
Dependent Claim 14 words
The invention of Claim 2 wherein an optical detector is mounted at said aperture.
Claim 4
Dependent Claim 15 words
The invention of Claim 3 including electronic means for processing signals provided by said detector.
Claim 5
Dependent Claim 144 words
A laser warning system comprising: a wide field-of-view optical element consisting of a frusto-conical block of optically transparent material having: a first surface and a second surface, said first surface being parallel with said second surface and coaxial therewith, the width R₁ of the first surface being less than the width R₂ of said second surface such that the sides of said element are slanted, first reflective means disposed at said first surface for directing incident optical energy, and second reflective means disposed at said second surface for directing incident optical energy, said second reflective means being disposed on said second surface.between the outer periphery thereof and a nonzero distance R₃ from the center thereof to provide an aperture; an optical detector mounted at said aperture; and electronic means for processing signals provided by said detector to indicate targeting by a laser target designator.
Claim 6
Dependent Claim 25 words
The invention of claim 2 wherein said first reflective means is a mirrored surface and whereas said second reflective means is a diffusely reflecting surface.
Claim 7
Dependent Claim 25 words
The invention of claim 6 wherein said first reflective means is a mirrored surface and whereas said second reflective means is a diffusely reflecting surface.

References Cited (Backward Citations)

DD219595A5 Cited
EP0177130B1 Cited
EP0344364A2 Cited
US4978843A Cited

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