Real-image zoom finder optical system

Details Real-image zoom finder optical system Real-image zoom finder optical system

1994-11-29

1996-11-19

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359676, 359678, 396379, G02B 1514, G03B 1308

Patent

active

055768890

ABSTRACT:
A finder optical system of the present invention includes from the object side an objective lens system of a positive refractive power and an eyepiece system of a positive refractive power. The objective lens system includes from the object side a first lens unit of a negative refractive power, a second lens unit of a positive refractive power and a third lens unit of a positive refractive power. Zooming is performed by moving the first and second lens units. Each of the first and second lens units includes a single lens having at least one aspherical surface. The third lens unit includes a lens prism at least an incident surface of which is an aspherical surface.

REFERENCES:
patent: 5005955 (1991-04-01), Ohshita
patent: 5257129 (1993-10-01), Morooka et al.
patent: 5359377 (1994-10-01), Kamo
patent: 5448411 (1995-09-01), Morooka
patent: 5495365 (1996-02-01), Morooka

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