1984-09-07
1986-11-11
Corbin, John K.
350472, G02B 2500, G02B 934
Patent
active
046219048
ABSTRACT:
A magnifier lens has a focal length f and a distance of at least 0.58f between the exit pupil (EXP) and the last lens (L.sub.5) vertex. This magnifier lens comprises, successively from the object-side to the eye-side, a lens, such as a meniscus lens (L.sub.1) with its concave side facing the object, a positive lens (L.sub.2) and a negative lens (L.sub.3) as well as a meniscus lens (L.sub.4) and a positive lens (L.sub.5), defining the last lens, separated by an air space (d.sub.7). The meniscus lens (L.sub.4) faces the eye with its concave side. The use of thin lenses permits a short overall length of a preferred embodiment of only 1.27f, and a sum of the lens thicknesses of 0.89f. Three large lenses (L.sub.2, L.sub.3, L.sub.4) may be made of so-called light-weight glass (SKL15 and SFL11) instead of regular glass. This results in a handy magnifier of short length and low weight with low cost of manufacture due to the small number of lens elements. A good state of correction is evidenced by a distortion of under 3 percent for a semi-field angle of 20.degree.. The magnifier lens is particularly well suited for use in optoelectronics, i.e. for observation of the image on the anode screen of an electronic tube.
REFERENCES:
patent: 2363712 (1944-11-01), Warmisham et al.
patent: 3888567 (1975-06-01), Shoemaker
patent: 4286844 (1981-09-01), Nagler
Corbin John K.
Kleeman Werner W.
Sugarman Scott J.
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