Eyepiece lens system, finder optical system, and electronic...

Details Eyepiece lens system, finder optical system, and electronic... Eyepiece lens system, finder optical system, and electronic...

2011-03-22

2011-03-22

Perkey, W. B. (Department: 2862)

Photography

Having camera indicator

Having display in viewfinder

C396S374000, C396S382000, C359S785000

Reexamination Certificate

active

07912368

ABSTRACT:
An eyepiece lens system for an electronic viewfinder, usable to be disposed on an optical axis between a reflective LCD of the viewfinder and a last optical surface of the viewfinder, the eyepiece lens system comprising: a first lens having a positive refractive index; a second lens having a negative refractive index; and a third lens having a positive refractive index, wherein the first lens, the second lens, and the third lens are disposed in this order from a side of the LCD to a side of the last optical surface, satisfying the conditions: 18 mm<f1<20 mm, −18 mm<f2<−16 mm, 18 mm<f3<20 mm, 19 mm<f<21 mm, and 0≦HH′/f<+0.13 where f1is a focal length of the first lens, f2is a focal length of the second lens, f3is a focal length of the third lens, f is a combined focal length of the first to the third lenses, and HH′ is distance in an optical axis direction between a rear principal point H and a front principal point H′.

REFERENCES:
patent: 2005/0024738 (2005-02-01), Hoshi
patent: 4-318510 (1992-11-01), None
patent: 5-40232 (1993-02-01), None
patent: 2002-48985 (2002-02-01), None
patent: 2002-341259 (2002-11-01), None
patent: 2007-264179 (2007-10-01), None

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