Viewfinder having a high magnification ratio

Details Viewfinder having a high magnification ratio Viewfinder having a high magnification ratio

1997-10-06

1999-05-04

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359432, G02B 1514, G02B 2300

Patent

active

059009888

ABSTRACT:
A viewfinder having a high magnification ratio permits satisfactory correction of aberration in spite of its compact and simple structure. An objective lens group of the viewfinder includes a first lens unit having negative refractive power, a second lens unit having positive refractive power, and a third lens unit having negative refractive power and varies magnification by moving at least the second lens unit. Moreover, the first lens unit includes at least one negative lens, the second lens unit includes at least two positive lenses, and the third lens unit includes at least one negative lens. Furthermore, the positive lens is formed so that an object-side surface is aspherical and a predetermined condition is satisfied.

REFERENCES:
patent: 5712727 (1998-01-01), Mouri
patent: 5784204 (1998-07-01), Kang
patent: 5815312 (1998-09-01), Takato

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