Flat field eyepiece
AssigneeITT Manufacturing Enterprises, Inc.
InventorsDonald Janeczko, John Michael Hall
Life of this patent
Estimating the term…
Abstract
A lens system includes a first lens axially aligned with a second lens, where the first and second lenses are configured to be sequentially positioned from a pupil image of a viewer. The second lens is formed as a triplet having three cemented elements. The second lens includes a convex surface facing the first lens, and a flat surface opposing the convex surface of the second lens. The first lens includes a concave surface opposing a flat surface of the first lens; the second lens includes a concave surface and a convex surface; and the concave surface of the first lens and the concave and convex surfaces of the second lens have equal radii of curvatures.
Claims9
An eyepiece/magnifier comprising
- a first lens axially aligned with a second lens, the first and second lenses configured to be sequentially positioned from a pupil image of a viewer,
- wherein the second lens is formed as a triplet having three cemented elements;
- the first lens includes a concave surface opposing a flat surface of the first lens,
- the second lens includes a concave surface and a convex surface, and
- the concave surface of the first lens and the concave and convex surfaces of the second lens have equal radii of curvatures.
An eyepiece/magnifier comprising
- a first lens axially aligned with a second lens, the first and second lenses configured to be sequentially positioned from a pupil image of a viewer,
- wherein the second lens is formed as a triplet having three cemented elements,
- wherein an image screen is aligned axially along an optical line of the first and second lenses,
- a beam combiner is provided between the first and second lenses and the image screen, in axial alignment along the optical line,
- a display is provided substantially perpendicular to the optical line, and
- light emitted from the display and light emitted from the image screen are combined by the beam combiner for viewing by the viewer.
An eyepiece/magnifier comprising
- a first lens axially aligned with a second lens, the first and second lenses configured to be sequentially positioned from a pupil image of a viewer,
- wherein the second lens is formed as a triplet having three cemented elements,
- wherein an image screen is aligned axially along an optical line with the first and second lenses for viewing by the viewer, and
- the image screen includes a surface facing the first and second lenses that is substantially flatter than a surface having a 100 mm radius of curvature.
Dependencies are inferred from the claim text.