Viewfinder optical system

Details Viewfinder optical system Viewfinder optical system

1997-01-16

1999-11-09

Sugarman, Scott J.

Optical: systems and elements

Lens

Including a nonspherical surface

359422, 359432, 396373, 396382, G02B 1318, G03B 1306, G03B 1302

Patent

active

059825618

ABSTRACT:
A viewfinder optical system has a relay optical system and an eyepiece optical system. The relay optical system has a first, a second, and a third relay lens. The eyepiece optical system has a first and a second eyepiece lens. The first eyepiece lens, which is disposed closest to a secondary-image plane formed by the relay optical system has an aspherical surface on its secondary-image plane side.

REFERENCES:
patent: 5055868 (1991-10-01), Itoh et al.
patent: 5448411 (1995-09-01), Morooka
patent: 5749008 (1998-05-01), Ishihara et al.

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