Real-image finder

Details Real-image finder Real-image finder

1998-04-24

2000-02-01

Epps, Georgia

Optical: systems and elements

Single channel simultaneously to or from plural channels

359355, G02B 2710, G02B 1314

Patent

active

060210028

ABSTRACT:
A real-image finder comprises an objective optical system which forms an image of an object to be viewed; a field frame member located on a primary image forming plane on which the image formed by the objective optical system is formed; an ocular optical system through which the object image formed on the primary image forming plane; and an image erecting optical system which erects the object image formed by the objective optical system. The transparent members are provided on the front and rear surfaces of the field frame, and the thickness of the transparent members are determined so that if a foreign matter sticks to the end surfaces of the transparent members that are opposite to and located away from the field frame member, no foreign matter can be viewed through the ocular optical system.

REFERENCES:
patent: 5250969 (1993-10-01), Abe et al.
patent: 5434636 (1995-07-01), Hasushita et al.
patent: 5565950 (1996-10-01), Taguchi et al.

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