Imaging lens system
DC CAFC
First Claim
Patent Images
1. An imaging lens system including, in order 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;
a third lens element having a concave image-side surface;
a fourth lens element with positive refractive power;
a fifth lens element with negative refractive power having a concave image-side surface, at least one surface thereof being provided with at least one inflection point; and
an aperture stop disposed between an imaged object and the third lens element;
wherein an on-axis spacing between the first lens element and the second lens element is T12, a focal length of the imaging lens system is f, an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, and T12, f, V2, and V3 satisfy the relations;
0.5<
(T12/f)×
100<
15; and
|V2−
V3 |<
15.
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Abstract
This invention provides an imaging lens system including, in order from an object side to an image side: a first lens with positive refractive power having a convex object-side surface; a second lens with negative refractive power; a third lens having a concave image-side surface; a fourth lens with positive refractive power; a fifth lens with negative refractive power having a concave image-side surface, at least one surface thereof having at least one inflection point; and an aperture stop disposed between an imaged object and the third lens. The on-axis spacing between the first lens and second lens is T12, the focal length of the imaging lens system is f, and they satisfy the relation: 0.5<(T12/f)×100<15.
109 Citations
27 Claims
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1. An imaging lens system including, in order from an object side to an image side:
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a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power; a third lens element having a concave image-side surface; a fourth lens element with positive refractive power; a fifth lens element with negative refractive power having a concave image-side surface, at least one surface thereof being provided with at least one inflection point; and an aperture stop disposed between an imaged object and the third lens element; wherein an on-axis spacing between the first lens element and the second lens element is T12, a focal length of the imaging lens system is f, an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, and T12, f, V2, and V3 satisfy the relations;
0.5<
(T12/f)×
100<
15; and
|V2−
V3 |<
15. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An imaging lens system including, in order from an object side to an image side:
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a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power; a third lens element with negative refractive power; a fourth lens element with positive refractive power having a concave object-side surface and a convex image-side surface; a fifth lens element with negative refractive power having a concave image-side surface, at least one surface thereof being provided with at least one inflection point; and an aperture stop disposed between an imaged object and the third lens element; wherein an on-axis spacing between the first lens element and the second lens element is T12, a focal length of the imaging lens system is f and T12 and f satisfy the relation;
0.5<
(T12/f)×
100<
15. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification
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Litigation Data
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Current AssigneeLargan Precision Co Limited (Largan Precision)
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Original AssigneeLargan Precision Co Limited (Largan Precision)
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InventorsChen, Chun-Shan
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Primary Examiner(s)Schwartz, Jordan
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Application NumberUS12/654,912Publication NumberTime in Patent Office935 DaysField of Search359763-764, 359754-757, 359771-773, 359776-778, 359713-714US Class Current359/764CPC Class CodesG02B 13/0045 having five or more lensesG02B 13/18 with lenses having one or m...G02B 27/0025 for optical correction, e.g...G02B 3/04 with continuous faces that ...G02B 9/60 having five components onlyH04N 23/00 Cameras or camera modules c...H04N 23/54 Mounting of pick-up tubes, ...
