Miniature telephoto lens assembly
DC CAFCFirst Claim
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1. A lens assembly, comprising:
- a plurality of refractive lens elements arranged along an optical axis, wherein at least one surface of at least one of the plurality of lens elements is aspheric, wherein the lens assembly has an effective focal length (EFL), wherein a lens system that includes the lens assembly plus a window positioned between the plurality of lens elements and an image plane has a total track length (TTL) of 6.5 millimeters or less, wherein a ratio TTL/EFL is less than 1.0, wherein the plurality of lens elements comprises, in order from an object side to an image side, a first lens element with positive refractive power, a second lens element with negative refractive power, and a third lens element, wherein a focal length f1 of the first lens element is smaller than TTL/2 and wherein a lens assembly F # is smaller than 2.9.
1 Assignment
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1 Petition
Accused Products
Abstract
An optical lens assembly includes five lens elements and provides a TTL/EFL<1.0. In an embodiment, the focal length of the first lens element f1<TTL/2, an air gap between first and second lens elements is smaller than half the second lens element thickness, an air gap between the third and fourth lens elements is greater than TTL/5 and an air gap between the fourth and fifth lens elements is smaller than about 1.5 times the fifth lens element thickness. All lens elements may be aspheric.
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Citations
24 Claims
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1. A lens assembly, comprising:
- a plurality of refractive lens elements arranged along an optical axis, wherein at least one surface of at least one of the plurality of lens elements is aspheric, wherein the lens assembly has an effective focal length (EFL), wherein a lens system that includes the lens assembly plus a window positioned between the plurality of lens elements and an image plane has a total track length (TTL) of 6.5 millimeters or less, wherein a ratio TTL/EFL is less than 1.0, wherein the plurality of lens elements comprises, in order from an object side to an image side, a first lens element with positive refractive power, a second lens element with negative refractive power, and a third lens element, wherein a focal length f1 of the first lens element is smaller than TTL/2 and wherein a lens assembly F # is smaller than 2.9.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A lens assembly, comprising:
- a plurality of refractive lens elements arranged along an optical axis, wherein at least one surface of at least one of the plurality of lens elements is aspheric, wherein the lens assembly has an effective focal length (EFL), wherein a lens system that includes the lens assembly plus a window positioned between the plurality of lens elements and an image plane has a total track length (TTL) of 6.5 millimeters or less, wherein a ratio TTL/EFL is less than 1.0, wherein the plurality of lens elements comprises, in order from an object side to an image side, a first lens element with positive refractive power and a focal length f1, a second lens element with negative refractive power and a focal length f2, and a third lens element with a focal length f3, wherein the focal length f1, the focal length f2 and the focal length f3 fulfill the condition 1.2×
|f3|>
|f2|>
1.5×
f1, and wherein a lens assembly F # is smaller than 2.9. - View Dependent Claims (12, 13, 14, 15, 16, 17)
- a plurality of refractive lens elements arranged along an optical axis, wherein at least one surface of at least one of the plurality of lens elements is aspheric, wherein the lens assembly has an effective focal length (EFL), wherein a lens system that includes the lens assembly plus a window positioned between the plurality of lens elements and an image plane has a total track length (TTL) of 6.5 millimeters or less, wherein a ratio TTL/EFL is less than 1.0, wherein the plurality of lens elements comprises, in order from an object side to an image side, a first lens element with positive refractive power and a focal length f1, a second lens element with negative refractive power and a focal length f2, and a third lens element with a focal length f3, wherein the focal length f1, the focal length f2 and the focal length f3 fulfill the condition 1.2×
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18. A lens assembly, comprising:
- five refractive lens elements arranged along an optical axis, wherein at least one surface of at least one of the lens elements is aspheric wherein the lens assembly has an effective focal length (EFL), a total track length (TTL) of 6.5 millimeters or less and a ratio TTL/EFL of less than 1.0, wherein the lens elements comprises, in order from an object side to an image side, a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element and a fourth lens element, wherein the third lens element and the fourth lens element are separated by an air gap greater than TTL/5 and wherein a lens assembly F # is smaller than 2.9.
- View Dependent Claims (19, 20, 21, 22, 23, 24)
Specification