Compact eyepiece using an imersed field lens
First Claim
1. An optical magnifying eyepiece comprising:
- a flat immersed object surface;
said eyepiece further comprising at least one concave reflecting surface;
and at least one negative lens element anda plurality of positive lens elements having primarily convex refracting surfaces wherein a radii of said convex refracting surfaces are not all the same sign and said surfaces are axially combined sections of spheres; and
further wherein said eyepiece produces a distortion free image over a wide field of view when said immersed object surface is observed from an external viewing position.
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Accused Products
Abstract
A first embodiment is a lens system having a plurality of refractive and reflective spherical elements that work as a magnifier to produce a distortion free, less than 1%, image with optical correction over a wide field of view. The system has at least one concave reflecting surface, and at least three convex refracting surfaces with the sign of the radius of one of the convex refracting surfaces being opposite of the sign of the radius of remaining two convex refracting surfaces. A second embodiment is a lens having a concave reflecting element which is on a substrate that is a negative lens by transmission with an index of refraction between 1.6<nd >2.0 and a dispersion 49<νd>15. This is used in combination with at least 3 positive refracting surfaces with less dispersive power than the negative element and with the sign of the radius of one of the positive elements being opposite from the sign of the radius of the remaining positive elements.
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Citations
19 Claims
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1. An optical magnifying eyepiece comprising:
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a flat immersed object surface; said eyepiece further comprising at least one concave reflecting surface; and at least one negative lens element and a plurality of positive lens elements having primarily convex refracting surfaces wherein a radii of said convex refracting surfaces are not all the same sign and said surfaces are axially combined sections of spheres; and further wherein said eyepiece produces a distortion free image over a wide field of view when said immersed object surface is observed from an external viewing position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification