Real image finder optical system having a relay lens system

Details Real image finder optical system having a relay lens system Real image finder optical system having a relay lens system

1998-10-06

2000-04-11

Epps, Georgia

Optical: systems and elements

Lens

Multiple component lenses

359645, 359432, 359431, 359689, 359428, 359570, G02B 912, G02B 2500, G02B 718, G02B 2300

Patent

active

060494352

ABSTRACT:
A real image finder optical system, having a relay lens system, comprises a positive first lens group, a positive second lens group, and a positive third lens group, in this order from the object. The finder optical system is arranged to form an inverted primary image of an object by the positive first lens group, and to form an erected secondary image by the positive second lens group functioning as the relay lens system so that the erected secondary image can be viewed through the third lens group. Furthermore, the second lens group comprises a diffractive optical element having at least one diffractive surface having positive diffractive power.

REFERENCES:
patent: 5257133 (1993-10-01), Chen

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