초록 ▼

A view finder for use in photographic apparatus which embody or are connectable with two objectives having different focal lengths has a field lens, an eye lens behind the field lens, and two intermediate lenses each of which is pivotable in the housing about a fixed axis between an operative positi

A view finder for use in photographic apparatus which embody or are connectable with two objectives having different focal lengths has a field lens, an eye lens behind the field lens, and two intermediate lenses each of which is pivotable in the housing about a fixed axis between an operative position in which it extends across the path of scene light between the eye lens and the field lens and a retracted position. A link is articulately connected to both intermediate lenses whereby the connection between the link and one of the intermediate lenses constitutes a pin-and-slot connection. A second pin-and-slot connection attaches the link to one arm of a two-armed lever which is pivotably mounted in the housing and the other arm of the lever is coupled to a reciprocable slide by a third pin-and-slot connection. When the slide is moved in one direction, one of the intermediate lenses is retracted and the other lens moves to operative position. The movements of the intermediate lenses are reversed when the slide is moved in the other direction. A prestressed looped spring engages the connections between the link and the intermediate lenses to yieldably urge either intermediate lens to its operative position.

대표청구항 ▼

In a photographic apparatus for use with objectives of different focal length, a view finder comprising a field lens for admission of scene light; first and second intermediate lenses disposed behind said field lens; fixed first and second pivots for said first and second intermediate lenses; a link

In a photographic apparatus for use with objectives of different focal length, a view finder comprising a field lens for admission of scene light; first and second intermediate lenses disposed behind said field lens; fixed first and second pivots for said first and second intermediate lenses; a link; first and second articulate connections between said link and said first and second intermediate lenses, one of said connections constituting a pin-and-slot connection; and means for pivoting said intermediate lenses through the medium of said link about the axes of said first and second pivots between first and second positions in which said first and second lenses respectively extend across the path of scene light behind said field lens.