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US 7,889,441 B2Granted
Lens system
AssigneeSamsung Techwin Co., Ltd.
InventorsAbe Yasuhiko, Tetsusuke Kusakawa
Life of this patent
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Abstract
A lens system including sequentially, from an object side to an image side, a first lens of a biconvex type having two aspherical surfaces, a second lens of a biconcave type having at least one aspherical surface, a third lens having two aspherical surfaces and having a positive refracting power, and a fourth lens having two aspherical surfaces and having a negative refracting power.
Claims13
A lens system comprising:
- a first lens of a biconvex type having two aspherical surfaces;
- a second lens of a biconcave type having at least one aspherical surface;
- a third lens having two aspherical surfaces and having a positive refracting power;
- and
- a fourth lens having two aspherical surfaces and having a negative refracting power,
- wherein the first lens, the second lens, the third lens, and the fourth lens are arranged sequentially from an object side of the lens system to an image side of the lens system;
- wherein an aspherical surface of an image side of the fourth lens comprises an inflection point within an effective aperture range,
- wherein |L1R1|>|L1R2|, where L1R1 is a radius of curvature of an object side of the first lens, and L1R2 is a radius of curvature of an image side of the first lens, and
- wherein 0.8<|L1R2|/|L2R2|<1.1, where L2R2 is a radius of curvature of an image side of the second lens.
6 more elements
An optical apparatus comprising:
- a biconvex refracting element comprising two aspherical surfaces;
- a biconcave refracting element comprising an aspherical surface;
- a positive refracting element comprising two aspherical surfaces;
- and
- a negative refracting element comprising two aspherical surfaces,
- wherein the biconvex refracting element, the biconcave refracting element, the positive refracting element, and the negative refracting element are arranged sequentially along an optical axis, the biconvex refracting element being disposed on an object side of the optical apparatus and the negative refracting element being disposed on an image side of the optical apparatus;
- wherein an aspherical surface of an image side of the fourth refracting element comprises an inflection point within an effective aperture range,
- wherein |L1R1|>|L1R2|, where L1R1 is a radius of curvature of an object side of the biconvex refracting element, and L1R2 is a radius of curvature of an image side of the biconvex refracting element, and
- wherein 0.8<|L1R2|/|L2R2|<1.1, where L2R2 is a radius of curvature of an image side of the biconcave refracting element.
6 more elements
Dependencies are inferred from the claim text.