Viewfinder optical system

Details Viewfinder optical system Viewfinder optical system

1999-01-12

2000-09-19

Adams, Russell

Photography

With viewfinder

With prism

396386, 359631, G03B 1308

Patent

active

061224545

ABSTRACT:
A viewfinder optical system directs a luminous flux emanating from an image plane to a pupil. The viewfinder optical system has an eyepiece optical system. The eyepiece optical system enlarges an image in order to be viewed by the pupil. The eyepiece optical system has a first lens unit, a second lens unit and a third lens unit. The first lens unit has at least one surface having a positive optical power. The second lens unit has at least one surface having a negative optical power. The third lens unit has a reflecting surface having a positive optical power.

REFERENCES:
patent: 3810221 (1974-05-01), Plummer
patent: 3836931 (1974-09-01), Plummer
patent: 3860940 (1975-01-01), Baker
patent: 3958261 (1976-05-01), Land et al.
patent: 5095326 (1992-03-01), Nozaki et al.
patent: 5663833 (1997-09-01), Nanba et al.
patent: 5701202 (1997-12-01), Takahashi
patent: 5749008 (1998-05-01), Ishihara et al.
patent: 5886824 (1999-03-01), Takahashi
patent: 5982561 (1999-11-01), Ishihara et al.

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