Viewfinder optical system and image pickup apparatus...

Details Viewfinder optical system and image pickup apparatus... Viewfinder optical system and image pickup apparatus...

2007-05-07

2009-12-08

Mahoney, Christopher E (Department: 2862)

Photography

With viewfinder

With prism

C359S726000, C348S333080

Reexamination Certificate

active

07630627

ABSTRACT:
At least one exemplary embodiment is directed to a viewfinder optical system which includes a first mirror having a roof shape configured to reflect light from an object image formed by a photographic lens towards the object image, a second mirror configured to reflect light reflected from the first mirror towards an observation side, and an eyepiece lens configured to receive light reflected from the second mirror. The second mirror includes a rotationally asymmetrical surface. The eyepiece lens includes at least one rotationally asymmetrical surface. The eyepiece lens includes a plurality of lenses, among which a lens closest to the second mirror includes a rotationally asymmetrical surface.

REFERENCES:
patent: 2001/0054988 (2001-12-01), Cone et al.
patent: 2000-356799 (2000-12-01), None
patent: 2001-311881 (2001-11-01), None
Sato, Yasuhisa (JP Publication No. 2000-356799): Finder, Dec. 26, 2000.
Ishii, Masatoshi (JP Publication No. 2001-311881): Finder Optical System, Nov. 9, 2001.

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