Dot sighting device

Details Dot sighting device Dot sighting device

1994-12-29

1997-01-14

Nguyen, Thong

Optical: systems and elements

Compound lens system

With tilted lens or tilted image plane

359424, 359429, 33241, 356251, G02B 2300, G02B 2310, F41G 132

Patent

active

055945848

ABSTRACT:
A dot sighting device comprises a lens-shaped transparent objective element with convex and concave surfaces, the convex surface extending outwardly toward a target and the concave surface extending toward a user's eye. The concave surface has a first center of curvature lying on a baseline parallel to an optical axis of the element extending from a center of the element to the user's eye. The concave surface has a first radius from the first center of curvature to a center of the concave surface. The baseline and the first radius subtends an angle .theta. with each other. The convex surface has a second center of curvature positioned eccentrically from the first center of curvature located in a plane containing the baseline and the first radius. The convex surface has a second radius extending from the second center of curvature to a center of the convex surface. A light source is disposed behind the element and directed toward the center of the concave surface such that a light flux makes an angle .theta. with the first radius, the light source being adapted to project a light dot on the concave surface to be reflected to the user's eye.

REFERENCES:
patent: 3963356 (1976-06-01), Wiklund
patent: 4346995 (1982-08-01), Morris
patent: 4402605 (1983-09-01), Ekstrand
patent: 4665622 (1987-05-01), Idam
patent: 4854688 (1988-04-01), Hayford
patent: 4863269 (1988-06-01), Ellis
patent: 4973130 (1990-11-01), Gernet
patent: 5205044 (1993-04-01), DePaoli

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