Real-image type optical finder

Details Real-image type optical finder Real-image type optical finder

1998-06-10

1999-08-10

Sugarman, Scott J.

Optical: systems and elements

Lens

Eyepiece

396382, G02B 2500

Patent

active

059367750

ABSTRACT:
In a real-image type optical finder, a positive first lens group (objective lens group), a positive second lens group (relay lens group and image erecting optical system), and a positive third lens group (eyepiece lens group), are included in that order from the object side. The optical system satisfies the following condition (1):

REFERENCES:
patent: 4964686 (1990-10-01), Kato
patent: 5055868 (1991-10-01), Itoh et al.
patent: 5182672 (1993-01-01), Mukai et al.
patent: 5434636 (1995-07-01), Hasushita et al.
patent: 5495367 (1996-02-01), Morooka
patent: 5749008 (1998-05-01), Ishihara et al.

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