Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
117 words
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.
Claim 2
Dependent Claim
117 words
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.
Claim 3
Dependent Claim
38 words
A view finder as defined in claim 1, further comprising a support for said first and second pivots, said support, said first and second intermediate lenses and said link together constituting the four components of a parallel motion.
Claim 4
Dependent Claim
33 words
A view finder as defined in claim 1, further comprising first and second stops, said first and second intermediate lenses respectively abutting said first and second stops in said first and second positions.
Claim 5
Dependent Claim
21 words
A view finder as defined in claim 3, further comprising resilient means for biasing said intermediate lenses against the respective stops.
Claim 6
Dependent Claim
60 words
A view finder as defined in claim 1, wherein said means for pivoting comprises a reciprocable actuating member, a lever pivotable about a fixed axis and having first and second arms, a first pin-and-slot connection between said actuating member and one arm of said lever, and a second pin-and-slot connection between said link and the other arm of said lever.
Claim 7
Dependent Claim
39 words
A view finder as defined in claim 1, wherein said pivots are parallel to each other and are located one behind the other, as considered in the direction of travel of scene light through and beyond said field lens.
Claim 8
Dependent Claim
35 words
A view finder as defined in claim 1, further comprising an eye lens located behind and spaced apart from said field lens, said intermediate lenses being located between said field lens and said eye lens.
Claim 9
Dependent Claim
15 words
A view finder as defined in claim 1, wherein said intermediate lenses are biconcave lenses.
Claim 10
Dependent Claim
47 words
A view finder as defined in claim 1, wherein said first intermediate lens is closely adjacent to said field lens in said first positions of said intermediate lenses and said second intermediate lens is distant from said field lens in the second positions of said intermediate lenses.
Claim 11
Dependent Claim
51 words
A view finder as defined in claim 1, further comprising resilient means for yieldably urging said intermediate lenses to either of said positions, including a prestressed looped spring having a first end engaging the pin of said one articulate connection and a second end engaging the other of said articulate connections.