Back to results
US 11,899,176 B2Granted
Wide field of view five element lens system
AssigneeApple Inc.
InventorYuhong Yao
Life of this patent
Estimating the term…
Abstract
Lens systems are described that may be used in small form factor cameras. An imaging lens system may include a front aperture and five lens elements, and provides a low F-number (<=2.4), wide field of view (>=82 degrees), and short total track length (TTL). Lens system parameters and relationships may be selected at least in part to reduce, compensate, or correct for optical aberrations and lens artifacts and effects across the field of view.
Claims20
A lens system, comprising:
- a plurality of optical elements arranged along an optical axis of the lens system, wherein the plurality of optical elements includes, in order along the optical axis from an object side to an image side of the lens system:
- a front aperture stop;
- a first refractive lens element L1;
- a second refractive lens element L2;
- a third refractive lens element L3;
- a fourth refractive lens element L4;
- and
- a fifth refractive lens element L5;
- wherein F-number of the lens system is less than or equal to 2.4, and full field of view of the lens system is greater than or equal to 82 degrees;
- wherein respective Abbe numbers for L1, L3 and L5 are higher than respective Abbe numbers for L2 and L4;
- and
- wherein L5 satisfies the relationships:
- |fsys/f5|<0.55
- (R9+R10)/(R9−R10)>4
- where fsys is effective focal length of the lens system, f5 is effective focal length of L5, and R9 and R10 are radius of curvature of an object side surface and an image side surface of L5, respectively.
12 more elements
A camera, comprising:
- a photosensor configured to capture light projected onto a surface of the photosensor;
- and
- a front aperture 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 at or near the surface of the photosensor, wherein the lens system includes five refractive lens elements L1, L2, L3, L4, L5 arranged in order along an optical axis from a first lens element L1 on an object side of the camera to a fifth lens element L5 on an image side of the camera;
- wherein F-number of the lens system is less than or equal to 2.4, full field of view of the lens system is greater than or equal to 82 degrees, and wherein the lens system satisfies the relationship:
- TTL/2SD<0.85,
- where TTL is total track length of the lens system, and SD is semi-diagonal image height at an image plane of the lens system;
- wherein respective Abbe numbers for L1, L3 and L5 are higher than respective Abbe numbers for L2 and L4;
- and
- wherein L5 satisfies the relationships:
- |fsys/f5|<0.55
- (R9+R10)/(R9−R10)>4
- where fsys is effective focal length of the lens system, f5 is effective focal length of L5, and R9 and R10 are radius of curvature of an object side surface and an image side surface of L5, respectively.
9 more elements
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 is a camera comprising:
- a photosensor configured to capture light projected onto a surface of the photosensor;
- and
- a front aperture 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 at or near the surface of the photosensor, wherein the lens system includes five refractive lens elements L1, L2, L3, L4, L5 arranged in order along an optical axis from a first lens element L1 on an object side of the camera to a fifth lens element L5 on an image side of the camera;
- wherein F-number of the lens system is less than or equal to 2.4, full field of view of the lens system is greater than or equal to 82 degrees, and wherein the lens system satisfies the relationship:
- TTL/2SD<0.85,
- where TTL is total track length of the lens system, and SD is semi-diagonal image height at an image plane of the lens system;
- wherein respective Abbe numbers for L1, L3 and L5 are higher than respective Abbe numbers for L2 and L4;
- and
- wherein L5 satisfies the relationships:
- |fsys/f5|<0.55
- (R9+R10)/(R9−R10)>4
- where fsys is effective focal length of the lens system, f5 is effective focal length of L5, and R9 and R10 are radius of curvature of an object side surface and an image side surface of L5, respectively.
14 more elements
Dependencies are inferred from the claim text.