Lens system
First Claim
1. A lens system, comprising:
- six refractive lens elements arranged along an optical axis and configured to refract light from an object field to form an image of a scene at an image plane, wherein the lens elements include, in order along the optical axis from an object side to an image side;
a first lens element with positive refractive power having a convex object side surface;
a second lens element with negative refractive power having a concave image side surface and a concave object side surface;
a third lens element having a convex image side surface;
a fourth lens element with negative refractive power having a concave image side surface;
a fifth lens element; and
a sixth lens element with positive refractive power having a convex image side surface; and
an aperture stop located behind a front vertex of the lens system;
wherein a total track length (TTL) of the lens system is 6.5 millimeter or less, and wherein a focal ratio of the lens system is 2.8 or less; and
wherein the lens system has effective focal length f and wherein a telephoto ratio (TTL/f ) of the lens system is less than or equal to 1.0.
0 Assignments
0 Petitions
Accused Products
Abstract
Compact narrow angle lens systems that may be used in small form factor cameras. The lens system may include six lens elements with refractive power, and may provide lower F-numbers while maintaining or improving imaging quality and package size when compared to other compact lens systems. Total track length of the lens system may be 6.5 millimeters or less, for example 5.9 or 6 millimeters. Focal length of the lens system may be 7.0 millimeters or less, for example 6.6 millimeters. The lens system may include an aperture stop located behind the front vertex of the lens system, for example between the first and second lens elements, that effectively moves the ideal principal point of the camera to in front of the front vertex. The lens system may provide a focal ratio of 2.8 or less, for example 2.6 or 2.4.
18 Citations
17 Claims
-
1. A lens system, comprising:
-
six refractive lens elements arranged along an optical axis and configured to refract light from an object field to form an image of a scene at an image plane, wherein the lens elements include, in order along the optical axis from an object side to an image side; a first lens element with positive refractive power having a convex object side surface; a second lens element with negative refractive power having a concave image side surface and a concave object side surface; a third lens element having a convex image side surface; a fourth lens element with negative refractive power having a concave image side surface; a fifth lens element; and a sixth lens element with positive refractive power having a convex image side surface; and an aperture stop located behind a front vertex of the lens system; wherein a total track length (TTL) of the lens system is 6.5 millimeter or less, and wherein a focal ratio of the lens system is 2.8 or less; and wherein the lens system has effective focal length f and wherein a telephoto ratio (TTL/f ) of the lens system is less than or equal to 1.0. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A camera system, comprising:
-
a lens system comprising; six refractive lens elements arranged along an optical axis and configured to refract light from an object field to form an image of a scene at an image plane, wherein the six refractive lens elements include, in order along the optical axis from an object side to an image side; a first lens element with positive refractive power having a convex object side surface; a second lens element with negative refractive power having a concave image side surface and a concave object side surface; a third lens element having a convex image side surface; a fourth lens element with negative refractive power having a concave image side surface; a fifth lens element; and a sixth lens element with positive refractive power having a convex image side surface; and an aperture stop located behind a front vertex of the lens system; wherein a total track length (TTL) of the lens system is 6.5 millimeter or less, and wherein a focal ratio of the lens system is 2.8 or less; wherein the lens system has effective focal length f , and wherein a telephoto ratio (TTL/f ) of the lens system is less than or equal to 1.0; and a photosensor configured to capture light projected onto a surface of the photosensor from the lens system. - View Dependent Claims (8, 9, 10, 11, 12)
-
-
13. A device, comprising:
-
one or more processors; one or more cameras; and a memory comprising program instructions executable by at least one of the one or more processors to control operations of the one or more cameras; wherein at least one of the one or more cameras comprises; a photosensor configured to capture light projected onto a surface of the photosensor; and a lens system configured to refract light from an object field located in front of the camera to form an image of a scene at an image plane proximate to the surface of the photosensor, wherein the lens system comprises; six refractive lens elements arranged along an optical axis and configured to refract light from an object field to form an image of a scene at an image plane, wherein the lens elements include, in order along the optical axis from an object side to an image side; a first lens element with positive refractive power having a convex object side surface; a second lens element with negative refractive power having a concave image side surface and a concave object side surface; a third lens element having a convex image side surface; a fourth lens element with negative refractive power having a concave image side surface; a fifth lens element; and a sixth lens element with positive refractive power having a convex image side surface; and an aperture stop located behind a front vertex of the lens system; wherein a total track length (TTL) of the lens system is 6.5 millimeter or less, and wherein a focal ratio of the lens system is 2.8 or less; and wherein the lens system has effective focal length f and wherein a telephoto ratio (TTL/f ) of the lens system is less than or equal to 1.0. - View Dependent Claims (14, 15, 16, 17)
-
Specification