Viewfinder optical system

Optical: systems and elements – Lens – With graded refractive index

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Details

359434, 359652, G02B 302, G02B 906

Patent

active

055238858

ABSTRACT:
An optical system comprising, in the order from the object side, an objective lens unit having a positive refractive power, a relay lens unit having a positive refractive power and an eyepiece lens unit having a positive refractive power, adapted in such a manner that an inverted image formed by the objective lens unit is inverted once again by the relay lens unit for forming an erect image, using at least one graded refractive index lens element in the relay lens unit, and having a small number of lens elements or a high magnification and favorably corrected aberrations.

REFERENCES:
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patent: 4618234 (1986-10-01), Ikari et al.
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patent: 4988172 (1991-01-01), Kanamori et al.
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patent: 5011272 (1991-04-01), Nakayama et al.
patent: 5182672 (1993-01-01), Mukai et al.
"Aberrtions and Design of Graded-Index (GRIN) Rods Used as Image Relays", Paxton et al, Applied Optics, vol. 10, No. 9, Sep. 1971 pp. 2090-2096.

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