Real image type finder optical system, and imaging system...

Details Real image type finder optical system, and imaging system... Real image type finder optical system, and imaging system...

2005-03-08

2005-03-08

Thompson, Tim (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S756000, C359S761000, C359S643000, C359S680000

Reexamination Certificate

active

06865032

ABSTRACT:
A real image type finder optical system includes an objective lens group having positive refracting power and an eyepiece lens group having a positive refracting power. The objective lens group includes a first group consisting of a negative lens, a second group consisting of a positive lens, a third group consisting of a positive lens and a fourth group having a negative refracting power and forming part of an image inverting optical system. Upon zooming from a wide-angle end to a telephoto end, the first and fourth groups remain fixed and the second and third groups move. The eyepiece lens group comprises a fifth group that forms part of the image inverting optical system and a sixth group having positive refracting power. The resulting real image type finder optical system satisfies specific conditions with respect to the back focus of the first to third groups at the wide-angle end.

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patent: 2001-133700 (2001-05-01), None

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