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US 3,942,901 AGranted
Optical sighting instrument with means for producing a sighting mark
OwnerJohn Arne Ingemund Ekstrandinventor
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OwnerJohn Arne Ingemund Ekstrandinventor
Estimating the term…
An optical instrument comprising a lens means having a concave light reflecting surface serving as a semi-transparent mirror, and a light source for directing light beams to the semi-transparent mirror which is arranged to produce an image of the light source, such that said image to an observer who has his eye directed to the concave mirror surface appears to lie far in front of the mirror to serve as a sighting mark on a sighting line between the observer's eye and a target; the lens means with the semi-transparent concave mirror surface and the light source being arranged such in relation to each other and in relation to the sighting line that the optical main axis from the light source to the lens means intersects the sighting line substantially on the semi-transparent mirror surface and intersects the theoretical optical main axis of the lens means in a point situated close to the focus of the concave mirror surface, and such that the focus and said point are transversely spaced from the sighting line whereby sighting errors as a result of misalignment of the observer's eye in relation to said sighting line will be reduced to a minimum.
A sighting instrument having front and rear ends and comprising a lens means mounted at said front end of the instrument and including a semi-transparent concave mirror surface facing said rear end of the instrument to be viewed therefrom and having its axis directed such that the focus of said concave mirror surface is offset from the sighting line of said instrument, and a light source having a light emitting surface positioned substantially at the focus of said concave mirror surface for directing light onto said concave mirror surface to produce a confined image of said light emitting surface, which is useful as a sighting mark and which to an observer who has his eye directed to said mirror surface in a distance rearwardly thereof, appears to lie in front of the mirror on the sighting line between the observer's eye and a target, said lens means with said concave mirror surface and said light source being arranged such in relation to each other and to said sighting line that the main axis of light emitted from said light emitting surface intersects said sighting line substantially on said semi-transparent mirror surface and intersects the theoretical optical main axis of said lens means in a point close to the focus of the concave side of the mirror surface, wherein said lens means comprises a front lens and a rear lens with said semi-transparent mirror surface arranged between said lenses, said rear lens being formed to eliminate spherical aberration from the reflecting semi-transparent mirror surface between said lenses and said front lens being formed such that the lens system will be zero-refracting, and wherein said light source placed substantially at the focus of said mirror comprises a light emitting diode adjustably movable in relation to said focus and a body of optical material extending from the front end of said diode and providing with its front end said light emitting surface of a configuration to produce said confined image useful as a sighting mark.
A sighting instrument having front and rear ends and including a lens means mounted at said front end of the instrument and including a semi-transparent concave mirror surface facing said rear end of the instrument to be viewed therefrom and having its axis directed such that the focus of said concave mirror surface is offset from the sighting line of said instrument, and a light source having a light emitting surface positioned substantially at the focus of said concave mirror surface for directing light onto said concave mirror surface to produce a confined image of said light emitting surface, which is useful as a sighting mark and which to an observer who has his eye directed to said mirror surface in a distance rearwardly thereof, appears to lie in front of the mirror on the sighting line between the observer's eye and a target, said lens means with said concave mirror surface and said light source being arranged such in relation to each other and to said sighting line that the main axis of light emitted from said light emitting surface intersects said sighting line substantially on said semi-transparent mirror surface and intersects the theoretical optical main axis of said means in a point close to the focus of the concave side of the mirror surface, wherein said lens means includes a front lens and a rear lens with said semi-transparent mirror surface arranged between said lenses, said rear lens being formed to eliminate spherical aberration from the relecting semi-transparent mirror surface between said lenses and said front lens being formed such that the lens system will be zero-refracting, and wherein said light source comprises a capsule containing a medium emitting beta particles and a substance arranged to receive and adapted to be activated by said particles to emit a light characteristic of the substance in question, said capsule having a front end closed by optic material the front end of which provides said light emitting surface of a configuration to produce said confined image useful as a sighting mark.
Dependencies are inferred from the claim text.