Real image zoom viewfinder
AssigneeEastman Kodak Company
InventorsEllis I. Betensky, Paul L. Ruben
Life of this patent
Estimating the term…
Abstract
A real image zooming viewfinder comprising three optical units with refracting optical power and an additional moving reflective optical unit. Zooming is accomplished by moving one of the refractive optical units and the additional reflective optical unit. A parallax correction can be achieved by moving laterally a first optical unit with refractive power.
Claims15
A real image zoom viewfinder system comprising three optical units each having optical power, the system having a minimum of three lens elements each having refractive optical power and one of which optical units is movable along an optical axis of the system and including an additional movable reflective optical unit, wherein zooming is performed by moving only a single optical unit having a refractive optical power and the single additional reflective optical unit.
A real image zoom viewfinder system comprising three optical units each having refractive optical power and a reflective erecting assembly for erecting an image of the object, said optical units being a first negative optical unit, a second positive optical unit which moves to effect a magnification change and to form a real image, and a third positive optical unit used to view said real image, wherein said reflective erecting assembly moves during zooming to provide a variable optical path length and thus compensates for the variable image position caused by the second unit.
A real image zoom viewfinder system comprised of three optical units each having optical power, the system having only three lens elements with refractive optical power and an additional reflective erecting assembly for erecting an image of the object, said optical units being a first negative optical unit which moves for compensating, a second positive optical unit which moves to effect a magnification change and to form a real image, and a third positive optical unit used to view said real image, wherein said reflective erecting assembly moves during zooming to provide a variable optical path length and thus compensates for the variable image position caused by the second unit.
Dependencies are inferred from the claim text.