Eyepiece lens of wide visual field

Details Eyepiece lens of wide visual field Eyepiece lens of wide visual field

1994-07-14

1997-11-04

Nelms, David C.

Optical: systems and elements

Lens

Eyepiece

359770, G02B 2500

Patent

active

056846355

ABSTRACT:
Eyepiece lenses of wide visual field, one of which has a field angle of 75.degree. or wider, and another one of which has a field angle of 60.degree. with a smaller number of constituent lenses than the former has. One of these eyepiece lenses comprises, in the order from the light incidence side, a first lens unit of negative refractive power, a second lens unit of positive refractive power in the meniscus form concave toward the light incidence side, a third lens unit of meniscus form concave toward the light incidence side, a fourth lens unit of positive refractive power, and a fifth lens unit of positive refractive power in the meniscus form convex toward the light incidence side. A middle image plane lies within the second lens unit, or in a space between the second and third lens units.

REFERENCES:
patent: 4720183 (1988-01-01), Dilworth
patent: 4747675 (1988-05-01), Nagler
patent: 5255121 (1993-10-01), Suzuki

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