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 Title: |
US4550984:
Head-mounted or helmet-mounted sighting device
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Reymond, Jean C.; Paris, France
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| Assignee: |
Thomson CSF, Paris, France
other patents from THOMSON-CSF (574015) (approx. 3,024)
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| Published / Filed: |
1985-11-05
/ 1983-02-22
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| Application Number: |
US1983000468599
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| IPC Code: |
Advanced:
F41G 3/22;
G02B 27/01;
G02C 11/00;
G02B 5/30;
G02B 27/00;
IPC-7:
F21Q 3/00;
G01C 9/06;
G02F 1/21;
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| ECLA Code: |
F41G3/22B; G02B27/01; G02B27/01A; G02B27/01B; G02B27/01C; G02B27/01C1; G02B27/01C2; G02C11/00; S02B5/30; S02B27/01A13; S02B27/01C; S02B27/01E; S02B27/01F1; S02B27/01A9; S02B27/01C3; S02B27/01D4;
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| U.S. Class: |
Current:
359/409;
033/262;
116/202;
340/980;
345/007;
345/032;
345/082;
359/489.19;
Original:
350/404;
033/262;
116/202;
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| Field of Search: |
350/404
351/158
033/262,267
116/202
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| Priority Number: |
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| Abstract: |
An image forming a sighting reticle can be displayed at infinity in the landscape under observation without any need for a collimating optical system. To this end, a birefringent crystal plate having parallel faces is placed between two crystal plates employed as polarizing filters and consisting respectively of a polarizer and an analyzer in order to produce the reticle in the form of interference fringes centered on the line of sight. The very lightweight sighting device can be integrated in one eye-glass of a spectacle frame or in a helmet visor. Complementary diodes can be incorporated in the device for providing information relating to directional prepositioning and the like.
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| Attorney, Agent or Firm: |
Cushman, Darby & Cushman ;
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| Primary / Asst. Examiners: |
Punter, William H.;
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| Maintenance Status: |
E1 Expired Check current status
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| INPADOC Legal Status: |
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| Designated Country: |
DE GB DE GB IT SE
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| Family: |
Show 6 known family members
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First Claim:
Show all 7 claims |
What is claimed is:
1. A sighting device comprising:
- means for simultaneous visual display of the landscape and of an image which is projected to infinity on an optical line of sight, said visual display means utilizing an assembly of crystal plates in which a birefringent plate having parallel faces is placed between two plates having the function of optical polarizing filters consisting respectively of a polarizer and an analyzer to produce said image in the form of interference fringes localized at infinity and which are generated from the incident light emitted by the landscape under observation, said optical line of sight corresponding to the crystal axis of the birefringent plate which is cut at right angles to this direction;
- means for indicating the direction of said line of sight with respect to a reference direction; and
- means for visual display of preliminary information relating to orientation of the sighting direction including a set of electroluminescent diodes placed outside the field of view of the interference fringes, and auxiliary computing means for automatically initiating turn-on and winking operation of the diodes at a frequency which is variable as a function of the relative angular displacement of the optical line of sight with respect to a given sighting direction, and auxiliary detection means for determining said given sighting direction and for transmitting the corresponding information to said computing means.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 70 U.S. patent(s) that reference this one
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