Wide-angle photographic lens system and a photographic camera
First Claim
Patent Images
1. A lens system comprising in order from an object side:
- an aperture stop;
a front lens unit located behind said aperture stop, said front lens unit including a triplet, said triplet consisting of two negative power lens elements and a positive power lens element located between said negative power lens elements; and
a rear lens unit located behind said front lens unit.
1 Assignment
0 Petitions
Accused Products
Abstract
A lens system 10 suitable for use in imaging on film F in panoramic cameras 100. The lens system 10 comprising an aperture stop ST, a front lens unit 20 located behind the aperture stop ST, the front lens unit 20 including a triplet; and a rear lens unit 30, preferably a meniscus lens element 32, located behind the front lens unit 20. The triplet consists of two negative power lens elements 22, 26 and a positive power lens element 24 located between the negative power lens elements 22, 26.
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Citations
32 Claims
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1. A lens system comprising in order from an object side:
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an aperture stop; a front lens unit located behind said aperture stop, said front lens unit including a triplet, said triplet consisting of two negative power lens elements and a positive power lens element located between said negative power lens elements; and a rear lens unit located behind said front lens unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 24)
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15. A lens system comprising in order from an object side:
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a front lens unit including a triplet, said triplet consisting of two negative power lens elements and a positive power lens element located between said negative power lens elements; and a rear lens unit located behind said front lens unit, said rear lens unit is a meniscus component having a concave surface oriented towards said front lens unit. - View Dependent Claims (16, 17, 18)
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19. A lens system comprising in order:
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a cemented triplet component consisting of a front negative power lens element, a middle positive power lens element, and a rear negative power lens element; and a single meniscus lens element located behind said cemented triplet, said single meniscus lens element having its concave surface oriented towards said cemented triplet. - View Dependent Claims (20, 21, 22, 23)
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25. A lens system consisting in order:
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an aperture stop; a cemented triplet component consisting of a front negative power lens element, a middle positive power lens element, and a rear negative power lens element; and a single meniscus lens element located behind said cemented triplet, said single meniscus lens element having its concave surface oriented towards said cemented triplet.
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26. A lens system comprising in order from an object side:
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an aperture stop; a front lens unit located behind said aperture stop, said front lens unit including a triplet, said triplet consisting of two negative power lens elements and a positive power lens element located between said negative power lens elements, wherein one of said negative lens elements of said triplet has an index of refraction that is lower than that of said positive lens elements of said triplet; and
that at least one of said negative elements of said triplet has an Abbe number which is lower than the Abbe number of said positive lens element; anda rear lens unit located behind said front lens unit.
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27. A lens system comprising in order from an object side:
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an aperture stop; a front lens unit located behind said aperture stop, said front lens unit including a triplet, said triplet consisting of two negative power lens elements and a positive power lens element located between said negative power lens elements, wherein n1 <
n2 <
n3, where n1 is the index of refraction of the front lens element comprising said triplet, n2 is the index of refraction of the positive lens element of said triplet, n3 is the index of refraction of the rear lens element of said triplet, and wherein one of said negative lens elements of said triplet has an Abbe number which is smaller than the Abbe number of the positive power lens element of said triplet; anda rear lens unit located behind said front lens unit.
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28. A photographic camera comprising:
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(a) a camera body; (b) a lens system including; (i) an aperture stop, (ii) a front lens unit located behind said aperture stop, said front lens unit including a triplet, said triplet consisting of two negative power lens elements and a positive power lens element located between said negative power lens elements, (iii) a rear lens unit located behind said front lens unit; and (c) a photosensitive medium for imaging onto by said lens system.
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29. A photographic camera comprising:
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(a) a camera body; (b) a lens system including; (i) a front lens unit including a triplet, said triplet being a positive power triplet, said triplet consisting of two negative power lens elements and a positive power lens element located between said negative power lens elements, (ii) a rear lens unit located behind said front lens unit said rear lens unit being a meniscus lens element having its concave surface oriented towards said triplet; and (c) a photosensitive medium for imaging onto by said lens system.
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30. A photographic camera comprising:
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(a) a camera body; (b) a lens system including; (i) a cemented triplet component consisting of a front negative power lens element, a middle positive power lens element, and a rear negative power lens element, (ii) a single meniscus lens element located behind said cemented triplet, said single meniscus lens element having its concave surface oriented towards said cemented triplet; and (c) a photosensitive medium for imaging onto by said lens system. - View Dependent Claims (31, 32)
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Specification