Real image mode finder optical system

Details Real image mode finder optical system Real image mode finder optical system

2005-03-01

2005-03-01

Perkey, W. B. (Department: 2851)

Photography

With viewfinder

Selective or adjustable viewfinder field

C396S382000, C396S384000, C359S643000, C359S678000, C359S689000

Reexamination Certificate

active

06862411

ABSTRACT:
A real image mode finder optical system is constructed to be independent of a photographing optical system and includes, in order from the object side, an objective optical system with a positive refracting power, a field frame located in the proximity of the imaging position of the objective optical system, and an eyepiece optical system with a positive refracting power. The real image mode finder optical system has an image erecting means, and the focal length of the objective optical system can be made shorter than that of the eyepiece optical system. In this case, the real image mode finder optical system satisfies the following condition:in-line-formulae description="In-line Formulae" end="lead"?0.52<mh/fe<1in-line-formulae description="In-line Formulae" end="tail"?where mh is the maximum width of the field frame and fe is the focal length of the eyepiece optical system.

REFERENCES:
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patent: 6175455 (2001-01-01), Kato et al.
patent: 6411783 (2002-06-01), Takase et al.
patent: 6515797 (2003-02-01), Koyama
patent: 06-051201 (1994-02-01), None
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patent: 09-211547 (1997-08-01), None
patent: 10-206933 (1998-08-01), None
patent: 11-242167 (1999-09-01), None

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