Lens assembly and optical imaging system using same
First Claim
1. A lens assembly for imaging an object, the lens assembly comprising:
- a plurality of lenses adapted to provide;
1) a field of view of approximately 40 degrees; and
2) a distortion of less than approximately 1%,wherein the plurality of lenses is further adapted to provide a ratio of the length of the lens assembly to the back focal length of approximately 1.39.
1 Assignment
0 Petitions
Accused Products
Abstract
A lens assembly is constructed to accommodate certain, often competing, design characteristics. The lens assembly provides high optical performance in a compact and easy to manufacture system. The lens assembly allows a manufacturer to produce a system that is common among various aperture sizes so that manufacturability is enhanced. The lens assembly is also suitable for use in connection with additional components, such as filters and/or electronic detectors, such as CCD'"'"'s and/or CMOS'"'"'s. The lens assembly may be arranged to provide a relatively wide angle, such as approximately 40 degrees, with minimal distortion, for example, less than 1%. a ratio of the length of the lens assembly to the back focal length of approximately 1.39 to accommodate additional components, such as optical filters. The lens assembly may be configured as a four group, six element, lens assembly. The lens assembly may contain compensating aberrations to compensate the aberrations of plane parallel plates that may be used in connection with the lens assembly.
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Citations
46 Claims
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1. A lens assembly for imaging an object, the lens assembly comprising:
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a plurality of lenses adapted to provide; 1) a field of view of approximately 40 degrees; and 2) a distortion of less than approximately 1%, wherein the plurality of lenses is further adapted to provide a ratio of the length of the lens assembly to the back focal length of approximately 1.39. - 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)
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25. A lens assembly for imaging an object, the lens assembly comprising:
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a plurality of lenses adapted to provide; 1) a field of view of approximately 40 degrees; and 2) a distortion of less than approximately 1% wherein the plurality of lenses is arranged to define a total length, the total length is between approximately 0.95 and approximately 1.02 of the focal length.
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26. A lens assembly for imaging an object, the lens assembly comprising:
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a plurality of lenses adapted to provide; 1) a field of view of approximately 40 degrees; and 2) a distortion of less than approximately 1% wherein the plurality of lenses comprises; a first lens group having at least one first lens element, the at least one first lens element having a first surface proximal to the object and a second surface distal to the object; and a second lens group having at least one second lens element, the at least one second lens element having a first surface proximal to the object and second surface distal to the object wherein the first and second lens groups are arranged to define a focal length, and wherein a distance between the first surface of the at least one first lens element and the second surface of the at least one second lens element is less than approximately 95% of the focal length, wherein the total length is between approximately 0.95 and approximately 1.02 of the focal length.
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27. A lens assembly for imaging an object, the lens assembly comprising:
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a first lens group having at least one first lens element, the at least one first lens element having a first surface proximal to the object and second surface distal to the object; a second lens group having at least one second lens element, the at least one second lens element having a first surface proximal to the object and second surface distal to the object; and an aperture stop disposed between the first lens group and the second lens group; wherein the first and second lens groups are arranged to define a focal length, and wherein a distance between the first surface of the at least one first lens element and the second surface of the at least one second lens element is less than approximately 95% of the focal length, wherein the total length of the lens assembly is between approximately 0.95 and approximately 1.02 of the focal length. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A lens assembly for imaging an object, the lens assembly comprising:
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a first lens group having at least one first lens element, the at least one first lens element having a first surface proximal to the object and second surface distal to the object; a second lens group having at least one second lens element, the at least one second lens element having a first surface proximal to the object and second surface distal to the object; and an aperture stop disposed between the first lens group and the second lens group; wherein the first and second lens groups are arranged to define a focal length, and wherein a distance between the first surface of the at least one first lens element and the second surface of the at least one second lens element is less than approximately 95% of the focal length, wherein the lens assembly further comprises; a housing having an aperture stop location at a position fixed relative to the housing; and wherein the aperture stop disposed between the first lens group and the second lens group has an aperture stop size selectable from a plurality of aperture stop sizes, and wherein the aperture stop is disposed at the fixed position of the aperture stop location, independent of the aperture stop size.
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42. A lens system comprising a plurality of lens elements and an aperture stop, each lens element having a lens surface defined by a radius of curvature (r), a thickness (T), and an index of refraction (n), the plurality of lens elements being spaced from each other by a distance (h), the lens system satisfying at least one of the following conditions:
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1000<
r4/r2 or r4=r2=approximately infinity;
−
0.56<
r3/r9<
−
0.81;
0.9<
r8/r9<
1.1 or r8=r9;
0.9<
r10/r11<
1.1 or r10=r11;
0.7<
(h1+h2)/(h3+h4)<
1.1;
0.95<
h1+h2+h3+h4++T1+T2+T3+T4+T5+T6<
f/1.02;
1.71<
nL1,nL2,nL5,nL6<
1.79; and
1.67<
nL3,nL4<
1.81;where; r2 represents a radius of curvature of an image side surface of a first lens element; r3 represents a radius of curvature of an object side surface of a second lens element; r4 represents a radius of curvature of an image side surface of the second lens element; r8 represents a radius of curvature of an object side surface of a fifth lens element; r9 represents a radius of curvature of an image side surface of the fifth lens element; r10 represents a radius of curvature of an object side surface of a sixth lens element; r11 represents a radius of curvature of an image side surface of the sixth lens element; h1 represents a gap distance between the image side surface of the first lens element to the object side surface of the second lens element; h2 represents a gap distance between the image side surface of a third lens element to the aperture stop; h3 represents a gap distance between the aperture stop to an object side surface of a fourth lens element; h4 represents a gap distance between the image side surface of the fifth lens element to the object side surface of the sixth lens element; T1 represents a thickness of the first lens element; T2 represents a thickness of the second lens element; T3 represents a thickness of the third lens element; T4 represents a thickness of the fourth lens element; T5 represents a thickness of the fifth lens element; T6 represents a thickness of the sixth lens element; nL1 represents an index of refraction of the first lens element; nL2 represents an index of refraction of the second lens element; nL3 represents an index of refraction of the third lens element; nL4 represents an index of refraction of the fourth lens element; nL5 represents an index of refraction of the fifth lens element; and nL6 represents an index of refraction of the sixth lens element, wherein the lens system further comprises a focal length of approximately 10 mm. - View Dependent Claims (43)
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44. A lens system comprising a plurality of lens elements and an aperture stop, each lens element having a lens surface defined by a radius of curvature (r), a thickness (T), and an index of refraction (n), the plurality of lens elements being spaced from each other by a distance (h), the lens system satisfying at least one of the following conditions:
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1000<
r4/r2 or r4=r2=approximately infinity;
−
0.56<
r3/r9<
−
0.81;
0.9<
r8/r9<
1.1 or r8=r9;
0.9<
r10/r11<
1.1 or r10=r11;
0.7<
(h1+h2)/(h3+h4)<
1.1;
0.95<
h1+h2+h3+h4++T1+T2+T3+T4+T5+T6<
f/1.02;
1.71<
nL1,nL2,nL5, nL6<
1.79; and
1.67<
nL3,nL4<
1.81;where; r2 represents a radius of curvature of an image side surface of a first lens element; r3 represents a radius of curvature of an object side surface of a second lens element; r4 represents a radius of curvature of an image side surface of the second lens element; r8 represents a radius of curvature of an object side surface of a fifth lens element; r9 represents a radius of curvature of an image side surface of the fifth lens element; r10 represents a radius of curvature of an object side surface of a sixth lens element; r11 represents a radius of curvature of an image side surface of the sixth lens element; h1 represents a gap distance between the image side surface of the first lens element to the object side surface of the second lens element; h2 represents a gap distance between the image side surface of a third lens element to the aperture stop; h3 represents a gap distance between the aperture stop to an object side surface of a fourth lens element; h4 represents a gap distance between the image side surface of the fifth lens element to the object side surface of the sixth lens element; T1 represents a thickness of the first lens element; T2 represents a thickness of the second lens element; T3 represents a thickness of the third lens element; T4 represents a thickness of the fourth lens element; T5 represents a thickness of the fifth lens element; T6 represents a thickness of the sixth lens element; nL1 represents an index of refraction of the first lens element; nL2 represents an index of refraction of the second lens element; nL3 represents an index of refraction of the third lens element; nL4 represents an index of refraction of the fourth lens element; nL5 represents an index of refraction of the fifth lens element; and nL6 represents an index of refraction of the sixth lens element, in combination with an aperture stop having a size selected from a plurality of aperture stop sizes. - View Dependent Claims (45)
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46. A lens system comprising a plurality of lens elements and an aperture stop, each lens element having a lens surface defined by a radius of curvature (r), a thickness (T), and an index of refraction (n), the plurality of lens elements being spaced from each other by a distance (h), the lens system satisfying each of the following conditions:
-
1000<
r4/r2 or r4=r2=approximately infinity;
−
0.56<
r8/r9<
−
0.81;
0.9<
r8/r9<
1.1 orr8=r9;
0.9<
r10/r11<
1.1 or r10=r11;
0.7<
(h1+h2)/(h3+h4)<
1.1;
0.95<
h1+h2+h3+h4++T1+T2+T3+T4+T5+T6<
f/1.02;
1.71<
nL1,nL2,nL5, nL6<
1.79; and
1.67<
nL3,nL4<
1.81;where; r2 represents a radius of curvature of an image side surface of a first lens element; r3 represents a radius of curvature of an object side surface of a second lens element; r4 represents a radius of curvature of an image side surface of the second lens element; r8 represents a radius of curvature of an object side surface of a fifth lens element; r9 represents a radius of curvature of an image side surface of the fifth lens element; r10 represents a radius of curvature of an object side surface of a sixth lens element; r11 represents a radius of curvature of an image side surface of the sixth lens element; h1 represents a gap distance between the image side surface of the first lens element to the object side surface of the second lens element; h2 represents a gap distance between the image side surface of a third lens element to the aperture stop; h3 represents a gap distance between the aperture stop to an object side surface of a fourth lens element; h4 represents a gap distance between the image side surface of the fifth lens element to the object side surface of the sixth lens element; T1 represents a thickness of the first lens element; T2 represents a thickness of the second lens element; T3 represents a thickness of the third lens element; T4 represents a thickness of the fourth lens element; T5 represents a thickness of the fifth lens element; T6 represents a thickness of the sixth lens element; nL1 represents an index of refraction of the first lens element; nL2 represents an index of refraction of the second lens element; nL3 represents an index of refraction of the third lens element; nL4 represents an index of refraction of the fourth lens element; nL5 represents an index of refraction of the fifth lens element; and nL6 represents an index of refraction of the sixth lens element.
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Specification