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Non-parallax optical sighting instrument
| Details |
Inventors: Whitman, III, Hobart A.;
Assignee:
Primary Examiner: Evans; F. L.
Assistant Examiner: Hantis; K. P.
Attorney, Agent or Firm: Schnedler; Steven C.
An optical sighting instrument having a main optical path including an objective lens, an eyepiece lens and a beamsplitter for combining or superimposing images. At least three image planes are defined with reference to the main optical path and the beamsplitter, and at least one of the three image planes is optically superimposed with the other two by the combining effect of the beamsplitter. Movable indicia elements are positioned in two of the image planes, and a fixed indicia element is positioned in the third one of the image planes. As a result, images of all three of the indicia elements are superimposed for viewing through the eyepiece lens, and the image of the fixed indicia element serves as a sighting reference. Illustratively, one of the movable indicia elements is a magnetic compass, the other of the movable indicia elements is a magnetic declination adjustment, and the fixed indicia element is a cross-hair sight. A pair of polarizers adjustable in relative orientation may be provided and positioned for varying the intensity either of the image of one of the indicia elements or the intensity of the object image. A lamp may be included for illuminating at least one of the indicia elements through the beamsplitter, while the beamsplitter prevents its direct light from reaching the eyepiece lens. The magnetic compass may be in the form of a sphere, and a field-flattener lens is positioned in front of the compass sphere so that the surface appears flat. |
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DETAILED DESCRIPTION Accordingly, it is an object of the invention to provide an improved optical sighting instrument which eliminates parallax.
It is another object of the invention to provide an optical sighting instrument including a magnetic compass and an improved means for adjusting for magnetic declination or variation.
It is another object of the invention to provide such an instrument including an improved means for reading a compass including a surface having a spherical curvature.
It is yet another object of the invention to provide such an instrument which may be employed for nighttime use.
It is yet another object of the invention to provide such an instrument wherein the relative intensities of the various superimposed indicia and object images may be adjusted to facilitate use and accurate reading under various conditions.
Briefly stated, in accordance with the invention there is provided an optical sighting instrument including a main optical path with an objective lens, an eyepiece lens, and a beamsplitter positioned within the main optical path.
At least three image planes are defined with reference to the main optical path and the beamsplitter, and at least one of the image planes is optically superimposed with the others of the image planes by means of the combining effect of the beamsplitter.
Movable indicia elements are positioned in two of the image planes, and a fixed indicia element is positioned in the third of the image planes.
As a result, images of all three of the indicia elements are superimposed for viewing through the eyepiece lens, and the image of the fixed indicia element serves as a sighting reference for sighting a distant object viewed through the instrument.
Parallax is non-existent since all image planes are optically unaltered relative to each other even as images are split and recombined, and the image planes share a common optical axis.
In one embodiment, one of the movable indicia elements is a magnetic compass, the other of the movable indicia elements is a magnetic declination adjustment, and the fixed indicia element is a cross-hair sight
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