Auto-focus actuator for field curvature correction of zoom lenses
First Claim
1. An optical system arranged along an optical axis, comprising:
- a first lens having a positive refractive power, having an object side surface of convex shape and an image side surface of concave shape;
a second lens having an object side surface of convex shape and an image side surface of concave shape;
a set of three lenses at least for adding chromatic correction and optical power for the optical system; and
a sixth lens having positive refractive power;
wherein;
the optical system introduces an optical distortion to an image formed by the optical system that changes with field angle,the optical system comprises field curvature correction for a range of object distances and,the optical system substantially satisfies a condition;
b_f/f<
0.3065, wherein b_f is a back focal length of the optical system and wherein f is a combined focal length of the combination of the first lens, second lens, set of three lenses and sixth lens.
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Accused Products
Abstract
A wide field angle camera module that incorporates field curvature correction suitable for an electronic device is described herein. By way of example, the wide field angle camera module comprises micro optical lenses adapted to capture field angles of greater than thirty degrees, and is further adapted to provide field curvature correction for a range of object distances, and for a range of zoom configurations include 1×, 2× and 3× zoom configurations. Furthermore, the field correction can be implemented alone or in conjunction with signal processing that corrects barrel distortion introduced by the micro optical lenses. In particular aspects, the field correction can be automated based on image quality analysis to provide a high quality image for object distances substantially 30 centimeters or larger.
104 Citations
35 Claims
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1. An optical system arranged along an optical axis, comprising:
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a first lens having a positive refractive power, having an object side surface of convex shape and an image side surface of concave shape; a second lens having an object side surface of convex shape and an image side surface of concave shape; a set of three lenses at least for adding chromatic correction and optical power for the optical system; and a sixth lens having positive refractive power; wherein; the optical system introduces an optical distortion to an image formed by the optical system that changes with field angle, the optical system comprises field curvature correction for a range of object distances and, the optical system substantially satisfies a condition;
b_f/f<
0.3065, wherein b_f is a back focal length of the optical system and wherein f is a combined focal length of the combination of the first lens, second lens, set of three lenses and sixth lens. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification