Photographing lens for lens-fitted film unit or fixed focus lens camera

A photographic lens for use in a camera having an image plane, the photographic lens comprising:

• (a) a first meniscus lens having a positive refracting power and a convex surface facing an object side of the photographic lens;
• and
• (b) a second meniscus lens having a positive refracting power and a concave surface facing the object side of the photographic lens, the second meniscus lens being farther from the object side of the photographic lens than the first meniscus lens,
• wherein the following conditions are satisfied:
• 0. 60<f/f.sub.1 <0.75
• -3.2<(r.sub.4 +r.sub.3)/(r.sub.4 -r.sub.3)<-2.5
• and wherein f represents a focal length of the photographic lens, f.sub.1 represents a focal length of the first meniscus lens, r.sub.3 represents a radius of curvature of said concave surface of the second meniscus lens, and r.sub.4 represents a radius of curvature of a surface of the second meniscus lens facing an image plane side of the photographic lens.

A photographic lens for use in a camera including an image plane having a surface curved so that the image plane approaches an object side of the photographic lens as the image plane extends in a longitudinal direction from an optical axis of the photographic lens, the photographic lens comprising:

• (a) a first meniscus lens having a positive refracting power and a convex surface facing the object side of the photographic lens,
• wherein at least one surface of said first meniscus lens is aspherical and has a decreasing refracting power as the aspherical surface extends from an optical axis of the photographic lens;
• and
• (b) a second meniscus lens having a positive refracting power and a concave surface facing the object side of the photographic lens, the second meniscus lens being farther from the object side of the photographic lens than the first meniscus lens,
• wherein the following conditions are satisfied:
• 0.50<f/f.sub.1 <0.90
• -8<(r.sub.4 +r.sub.3)/(r.sub.4 -r.sub.3)<-0.5
• 0.003<(r.sub.1 .multidot.d.sub.1)/(f.multidot.f.sub.1)<0.004
• .nu..sub.1 >55
• and wherein f represents a focal length of the photographic lens, f.sub.1 represents a focal length of the first meniscus lens, r.sub.3 represents a radius of curvature of said concave surface of the second meniscus lens, r.sub.4 represents a radius of curvature of a surface of the second meniscus lens facing an image plane side of the photographic lens, r.sub.1 represents a paraxial radius of curvature of said convex surface of the first meniscus lens, d.sub.1 represents a width along the optical axis of the first meniscus lens and .nu..sub.1 represents an Abbe's number of the first meniscus lens.

A photographic lens for use in a camera having an image plane, the photographic lens comprising:

• (a) a first meniscus lens having a positive refracting power and a convex surface facing an object side of the photographic lens;
• and
• (b) a second meniscus lens having a positive refracting power and a concave surface facing the object side of the photographic lens, the second meniscus lens being farther from the object side of the photographic lens than the first meniscus lens,
• wherein the following conditions are satisfied:
• .
• 0. 50<f/f.sub.1 <0.90
• -8<(r.sub.4 +r.sub.3)/(r.sub.4 -r.sub.3)<-1.5 (8)
• 0.002<(r.sub.1 .multidot.d.sub.1)/(f.multidot.f.sub.1)<0.008
• .nu..sub.1 >55
• and wherein f represents a focal length of the photographic lens, f.sub.1 represents a focal length of the first meniscus lens, r.sub.1 represents a radius of curvature of said concave surface of the second meniscus lens, r.sub.4 represents a radius of curvature of a surface of the second meniscus lens facing an image plane side of the photographic lens, r.sub.1 represents a paraxial radius of curvature of said convex surface of the first meniscus lens, d.sub.1 represents a thickness of the first meniscus lens along an optical axis of the photographic lens, and .nu..sub.1 represents an Abbe's number of the first meniscus lens.

A photographic lens for use in a camera including an image plane having a surface curved so that the image plane approaches an object side of the photographic lens as the image plane extends in a longitudinal direction from an optical axis of the photographic lens, the photographic lens comprising:

• (a) a first meniscus lens having a positive refracting power and a convex surface facing the object side;
• and
• (b) a second meniscus lens having a positive refracting power and a concave surface facing the object side of the photographic lens, the second meniscus lens being farther from the object side of the photographic lens than the first meniscus lens,
• wherein the following conditions are satisfied:
• 0.24<f/f.sub.1 <0.90
• -8<(r.sub.4 +r.sub.3)/(r.sub.4 -r.sub.3)<-0.5
• 0.003<(r.sub.1 .multidot.d.sub.1)/(f.multidot.f.sub.1)<0.004
• .nu..sub.1 >55
• and wherein f represents a focal length of the photographic lens, f.sub.1 represents a focal length of the first meniscus lens, r.sub.3 represents a radius of curvature of said concave surface of the second meniscus lens, r.sub.4 represents a radius of curvature of a surface of the second meniscus lens facing an image plane side of the photographic lens, r.sub.1 represents a paraxial radius of curvature of said convex surface of the first meniscus lens, d.sub.1 represents a thickness along the optical axis of the first meniscus lens, and .nu..sub.1 represents an Abbe's number of the first meniscus lens.