Patent ID: 6643462
Filing Date: 2003-11-04
Classification: G03B

Abstract:
A viewfinder having a variable magnification comprising:a telescope housing having an axis defining a light direction, the telescope housing comprising at least one curved groove; a rotating ring comprising at least one longitudinal groove which is substantially parallel to the axis, the rotating ring being rotatably positioned around the telescope housing; a variator comprising at least one guide pin, the variator being journalled within the telescope housing and adapted to move within the telescope housing in the direction of the axis; a first lens unit; a second lens unit; a third lens unit, wherein the first, second, and third lens units are positioned in the telescope housing, wherein the first and third lens units are fixed with respect to the telescope housing, wherein the second lens unit is provided in the variator and is adapted to move with respect to the first and third lens units along the longitudinal axis to change the magnification of the viewfinder, and wherein at least one of said at least one guide pin projects through at least one of said at least one curved groove and extends into at least one of said at least one longitudinal groove.