Optical system for use in photographic devices

Claim 2

A wide angle optical system for use in a camera having a cylindrical image surface, said system comprising an aperture stop and two different lenses, one disposed at the front of said aperture stop and the other disposed at the rear of said aperture stop, wherein said front lens functions as a landscape lens and has a shorter focal length than said rear lens and said rear lens functions as a meniscus corrector.

Claim 3

An optical system having a cylindrical image surface, said optical system comprising two different lenses and an aperture stop, said aperture stop positioned between said two different lenses, one of said lenses being disposed at the front of said aperture stop and the other being disposed at the rear of said aperture stop, wherein: said front lens functions as a landscape lens and has a shorter focal length than said rear lens and said rear lens functions as a meniscus corrector, said front lens having a convex front surface and a concave rear surface; and said rear lens having a concave front surface facing said aperture stop and a convex rear surface facing said cylindrical image surface.

Claim 4

An optical system having a cylindrical image surface, said optical system comprising two different lenses and an aperture stop, said aperture stop positioned between said two different lenses, one of said lenses being disposed at the front of said aperture stop and the other being disposed at the rear of said aperture stop, wherein: said front lens functions as a landscape lens and has a shorter focal length than said rear lens and said rear lens functions as a meniscus corrector, said front lens having a convex front surface and a concave rear surface; and said rear lens having a concave front surface facing said aperture stop and a convex rear surface facing said cylindrical image surface.

Claim 5

An optical system as claimed in claims 1 or 2, wherein said lenses are asymmetrically located relative to said stop.

Claim 6

An optical system as claimed in claim 1 or 2, wherein said lenses are so formed as to cause distortion in an image on a plano image plane, the distortion being such as to compensate the distortion introduced by the curvature of the cylindrical image surface, whereby the image created on the image plane of the system is essentially distortion free.

Claim 7

An optical system as claimed in claim 3 wherein said lenses are so formed as to cause distortion in an image on a plano image plane, the distortion being such as to compensate the distortion introduced by the curvature of the cylindrical image surface, whereby the image created on the image plane of the system is essentially distortion free.

Claim 8

An objective lens system comprising spaced lenses having an aperture stop located therebetween and a cylindrical image surface, said lenses comprising a first component, said first component having a meniscus shape disposed with its concave surface directed to the aperture stop, and a second meniscus shaped component disposed with its concave surface directed toward said first component, said first component having a shorter focal length than said second component.

Claim 9

An objective lens system comprising spaced lenses having an aperture stop located therebetween and a cylindrical image surface, said lenses comprising a first component, said first component having a meniscus shape disposed with its concave surface directed to the aperture stop, and a second meniscus shaped component disposed with its concave surface directed toward said first component, said first component having a shorter focal length than said second component.

Claim 10

An objective lens system as claimed in claim 6 wherein said lenses are so formed as to cause distortion in an image on a plano image plane, the distortion being such as to compensate for the distortion introduced by the curvature of the cylindrical image surface, whereby the image created on the image plane of the system is essentially distortion free.

Claim 11

An optical system having a cylindrical image surface, said optical system consisting essentially of two different lenses, front and rear, wherein said front lens has a shorter focal length than said rear lens, said lenses being so formed as to cause distortion in an image on a plano image plane, the distortion being such as to compensate the distortion introduced by the curvature of the cylindrical image surface, whereby the image created on the image surface of the system is essentially distortion free.

Claim 12

An optical system having a cylindrical image surface, said optical system consisting essentially of two different lenses, front and rear, wherein said front lens has a shorter focal length than said rear lens, said lenses being so formed as to cause distortion in an image on a plano image plane, the distortion being such as to compensate the distortion introduced by the curvature of the cylindrical image surface, whereby the image created on the image surface of the system is essentially distortion free.

Claim 13

An optical system for imaging an object onto a cylindrical image surface, said optical system comprises an aperture stop located between two different meniscus lenses, one of the lenses disposed at the front of said aperture stop and the other disposed towards the rear of said aperture stop wherein the lens located in front of said aperture stop has a shorter focal length than the other lens, said lenses being so formed as to cause distortion in an image on a plano image plane, the distortion being such as to compensate the distortion introduced by the curvature of the cylindrical image surface, whereby the image created on the image plane of the system is essentially distortion free.

Claim 14

An optical system for imaging an object onto a cylindrical image surface, said optical system comprises an aperture stop located between two different meniscus lenses, one of the lenses disposed at the front of said aperture stop and the other disposed towards the rear of said aperture stop wherein the lens located in front of said aperture stop has a shorter focal length than the other lens, said lenses being so formed as to cause distortion in an image on a plano image plane, the distortion being such as to compensate the distortion introduced by the curvature of the cylindrical image surface, whereby the image created on the image plane of the system is essentially distortion free.

Claim 15

An optical system as claimed in claim 1, 2, 8 or 9, further fulfilling the following two requirements: 1 mm.<CT<4 mm. 0.6 mm.<ET<3.9 mm. where CT is the center thickness of an element and ET is the edge thickness of an element.

Claim 16

An optical system as claimed in claim 3, further fulfilling the following two requirements: 1 mm.<CT<4 mm. 0.6 mm.<ET<3.9 mm. where CT is the center thickness of an element and ET is the edge thickness of an element.

Claim 17

An optical system according to claim 1 2, 8 or 9, wherein lateral color is corrected by choice of at least two different optical materials.

Claim 18

An optical system according to claim 3 wherein lateral color is corrected by choice of at least two different optical materials.

Claim 19

An objective lens system comprising asymmetrically spaced lenses having an aperture stop located therebetween, said lenses comprising a first component having a meniscus shape disposed with its concave surface directed to the center of said objective, and a second meniscus shaped component disposed with its concave surface directed toward said first component, said first component having a shorter focal length than the said second component, and said components further fulfilling the following two requirements: 1 mm.<CT<4 mm. 0.6 mm.<ET<3.9 mm. where CT is the center thickness of an element and ET is the edge thickness of an element.

Claim 20

An objective lens system comprising asymmetrically spaced lenses having an aperture stop located therebetween, said lenses comprising a first component having a meniscus shape disposed with its concave surface directed to the center of said objective, and a second meniscus shaped component disposed with its concave surface directed toward said first component, said first component having a shorter focal length than the said second component, and said components further fulfilling the following two requirements: 1 mm.<CT<4 mm. 0.6 mm.<ET<3.9 mm. where CT is the center thickness of an element and ET is the edge thickness of an element.

Claim 21

An optical system according to claim 1 and conforming substantially to the specifications in the following table: ______________________________________ REFRACTIVE Abbe V SURFACE R D INDEX NUMBER ______________________________________ S1a 5.56538 3.920 1.492 57.4 S2a 7.11637 2.519 Diaphragm 2.519 S3a -5.33878 3.352 1.492 57.4 S4a -5.14086 ______________________________________ wherein the radii of curvature R, the thickness and the spaces D are specified.

Claim 22

An optical system according to claim 1 and conforming substantially to the specifications in the following table: ______________________________________ REFRACTIVE Abbe V SURFACE R D INDEX NUMBER ______________________________________ S1b 5.8262 3.7595 1.494 57.6 S2b 7.5995 2.925 Diaphragm 2.925 S3b -5.5167 2.888 1.595 31.2 S4b -5.4769 ______________________________________ wherein the radii of curvature R, the thickness and the spaces D are specified.

Claim 23

An optical system according to claim 1 and conforming substantially to the specifications in the following table: ______________________________________ REFRACTIVE Abbe V SURFACE R D INDEX NUMBER ______________________________________ S1c 12.0211 2.000 1.492 57.4 S2c 29.4280 3.795 Diaphragm 1.495 S3c -9.44980 1.633 1.590 30.9 S4c -7.56870 ______________________________________ wherein the radii of curvature R, the thickness and the spaces D are specified.

Claim 24

An optical system according to claim 1 and conforming substantially to the specifications in the following table: ______________________________________ REFRACTIVE Abbe V SURFACE R D INDEX NUMBER ______________________________________ S1d 14.2440 2.500 1.492 57.4 S2d 31.8270 6.740 Diaphragm 3.545 S3d -12.8370 2.0471 1.492 57.4 S4d -10.2400 ______________________________________ wherein the radii of curvature R, the thickness and the spaces D are specified.