Biocular eyepiece optical system employing refractive and diffra

Details Biocular eyepiece optical system employing refractive and diffra Biocular eyepiece optical system employing refractive and diffra

1991-09-23

1992-09-29

Hannaher, Constantine

Optical: systems and elements

Diffraction

From zone plate

359566, 359570, 359650, 359651, 359742, 359774, 359785, G02B 518, G02B 302, G02B 308, G02B 914

Patent

active

051518236

ABSTRACT:
In one embodiment, a three-element biocular eyepiece system 40 having a first optical element 42 with at least one diffractive surface 44, a second optical element 48 having a refracting convex surface 50 and a refracting concave surface b 52 is provided. A third optical element 54 having a refracting convex surface 56 and a refracting convex surface 58 is also employed. In another embodiment, a four-element biocular system 60 is disclosed as having an optical element 62 having a refracting concave surface 64 and a refracting convex surface 66, a refractive-diffractive hybrid optical element 68 having a diffractive surface 70 and a refracting convex surface 72, an optical element 74 having a refracting convex surface 76 and a refracting concave surface 78, and an optical element 80 having a refracting concave surface 82 and a refracting convex surface 84. The diffractive surfaces 44 and 70 have a kinoform profile 102 a-d or approximated kinoform profiles 112a-d and 122a-d. Both versions of the biocular eyepiece 40 and 60 provide a biocular eyepiece which has fewer lens elements and a shorter overall length than conventional designs. Both versions of the biocular eyepiece 40 and 60 may be used in combination with a cathode ray tube 12 for magnification of images generated therein.

REFERENCES:
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patent: 4183624 (1980-01-01), Rogers et al.
patent: 4895790 (1990-01-01), Swanson et al.
patent: 5013133 (1991-05-01), Buralli et al.
patent: 5044706 (1991-09-01), Chen
patent: 5061052 (1991-10-01), De Jesus
"Infrared Applications of Diffractive Optical Elements", by Gary J. Swanson and Wilfrid B. Veldkamp, SPIF Proceedings, vol. 815, Paper No. 22, 1988.

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