US2021278638A1PendingUtilityA1
Imaging lens
Est. expiryMay 31, 2033(~6.8 yrs left)· nominal 20-yr term from priority
Inventors:Yukio Sekine
G02B 3/04G02B 13/18G02B 5/005G02B 13/16G02B 9/62G02B 13/002G02B 13/0045G02B 27/0025G02B 13/0015H05K 999/99
75
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Claims
Abstract
A compact high-resolution imaging lens which provides a wide field of view of 80 degrees or more and corrects various aberrations properly. Designed for a solid-state image sensor, the imaging lens includes constituent lenses arranged in the following order from an object side to an image side: a first positive (refractive power) lens having a convex object-side surface; a second negative lens having a concave image-side surface; a third positive lens as a double-sided aspheric lens having a convex object-side surface; a fourth positive lens having a convex image-side surface; a fifth lens as a double-sided aspheric lens having a concave image-side surface; and a sixth negative lens having a concave image-side surface. The image-side surface of the sixth lens has an aspheric shape with a pole-change point in a position off an optical axis.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . An imaging lens for a solid-state image sensor in which elements are arranged in order from an object side to an image side, comprising:
a first lens with positive refractive power having a convex surface on the object side; a second lens with negative refractive power having a concave surface on the image side; a third lens with positive refractive power as a double-sided aspheric lens having a convex surface on the object side; a fourth lens with positive refractive power having a convex surface on the image side; a fifth lens as a double-sided aspheric lens having a concave surface on the image side; and a sixth lens with negative refractive power having a concave surface on the image side, wherein the image-side surface of the sixth lens has an aspheric shape with a pole-change point in a position off an optical axis.
2 . The imaging lens according to claim 1 ,
wherein a conditional expression (11) below is satisfied:
0.8< ih/f< 1.2 (11)
where f: focal length of an overall optical system of the imaging lens ih: maximum image height.
3 . The imaging lens according to claim 1 ,
wherein a conditional expression (9) below is satisfied:
0.65<Σ d/TTL< 0.90 (9)
where TTL: distance on the optical axis from an object-side surface of an optical element located nearest to an object to an image plane without a filter, etc. Σd: distance on the optical axis from the object-side surface of the first lens to the image-side surface of the sixth lens.
4 . The imaging lens according to claim 3 ,
wherein a conditional expression (10) below is satisfied:
TTL/f< 1.6 (10)
where TTL: distance on the optical axis from an object-side surface of an optical element located nearest to an object to an image plane without a filter, etc. f: focal length of an overall optical system of the imaging lens.
5 . The imaging lens according to claim 1 ,
wherein: the fifth lens is a meniscus lens with negative refractive power and the object-side surface and the image-side surface of the fifth lens have an aspheric shape with a pole-change point in a position off the optical axis; and the sixth lens is a meniscus lens and the object-side surface of the sixth lens has an aspheric shape with a pole-change point in a position off the optical axis.
6 . The imaging lens according to claim 1 ,
wherein a conditional expression (1) below is satisfied:
0.55< f 1/ f< 1.7 (1)
where f1: focal length of the first lens f: focal length of an overall optical system of the imaging lens.
7 . The imaging lens according to claim 6 ,
wherein a conditional expression (2) below is satisfied:
−2.3< f 2/ f<− 0.8 (2)
where f2: focal length of the second lens f: focal length of an overall optical system of the imaging lens.
8 . The imaging lens according to claim 7 ,
wherein a conditional expression (12) below is satisfied:
1.3< f 3/ f< 7.0 (12)
where f3: focal length of the third lens f: focal length of an overall optical system of the imaging lens.
9 . The imaging lens according to claim 1 ,
wherein conditional expressions (3) and (4) below are satisfied:
45<ν d 1<80 (3)
20<ν d 2<40 (4)
where νd1: Abbe number of the first lens at d-ray νd2: Abbe number of the second lens at d-ray.
10 . The imaging lens according to claim 1 ,
wherein conditional expressions (5) to (8) below are satisfied:
50<ν d 3<75 (5)
50<ν d 4<75 (6)
20<ν d 5<40 (7)
50<ν d 6<75 (8)
where νd3: Abbe number of the third lens at d-ray νd4: Abbe number of the fourth lens at d-ray νd5: Abbe number of the fifth lens at d-ray νd6: Abbe number of the sixth lens at d-ray.
11 . The imaging lens according to claim 2 ,
wherein a conditional expression (9) below is satisfied:
0.65<Σ d/TTL< 0.90 (9)
where TTL: distance on the optical axis from an object-side surface of an optical element located nearest to an object to an image plane without a filter, etc. Σd: distance on the optical axis from the object-side surface of the first lens to the image-side surface of the sixth lens.
12 . The imaging lens according to claim 11 ,
wherein a conditional expression (10) below is satisfied:
TTL/f< 1.6 (10)
where TTL: distance on the optical axis from an object-side surface of an optical element located nearest to an object to an image plane without a filter, etc. f: focal length of an overall optical system of the imaging lens.
13 . The imaging lens according to claim 2 ,
wherein: the fifth lens is a meniscus lens with negative refractive power and the object-side surface and the image-side surface of the fifth lens have an aspheric shape with a pole-change point in a position off the optical axis; and the sixth lens is a meniscus lens and the object-side surface of the sixth lens has an aspheric shape with a pole-change point in a position off the optical axis.
14 . The imaging lens according to claim 2 ,
wherein a conditional expression (1) below is satisfied:
0.55< f 1/ f< 1.7 (1)
where f1: focal length of the first lens f: focal length of an overall optical system of the imaging lens.
15 . The imaging lens according to claim 14 ,
wherein a conditional expression (2) below is satisfied:
−2.3< f 2/ f<− 0.8 (2)
where f2: focal length of the second lens f: focal length of an overall optical system of the imaging lens.
16 . The imaging lens according to claim 15 ,
wherein a conditional expression (12) below is satisfied:
1.3< f 3/ f< 7.0 (12)
where f3: focal length of the third lens f: focal length of an overall optical system of the imaging lens.
17 . The imaging lens according to claim 2 ,
wherein conditional expressions (3) and (4) below are satisfied:
45<ν d 1<80 (3)
20<ν d 2<40 (4)
where νd1: Abbe number of the first lens at d-ray νd2: Abbe number of the second lens at d-ray.
18 . The imaging lens according to claim 2 ,
wherein conditional expressions (5) to (8) below are satisfied:
50<ν d 3<75 (5)
50<ν d 4<75 (6)
20<ν d 5<40 (7)
50<ν d 6<75 (8)
where νd3: Abbe number of the third lens at d-ray νd4: Abbe number of the fourth lens at d-ray νd5: Abbe number of the fifth lens at d-ray νd6: Abbe number of the sixth lens at d-ray.
19 . The imaging lens according to claim 8 ,
wherein conditional expressions (5) to (8) below are satisfied:
50<ν d 3<75 (5)
50<ν d 4<75 (6)
20<ν d 5<40 (7)
50<ν d 6<75 (8)
where νd3: Abbe number of the third lens at d-ray νd4: Abbe number of the fourth lens at d-ray νd5: Abbe number of the fifth lens at d-ray νd6: Abbe number of the sixth lens at d-ray.
20 . The imaging lens according to claim 16 ,
wherein conditional expressions (5) to (8) below are satisfied:
50<ν d 3<75 (5)
50<ν d 4<75 (6)
20<ν d 5<40 (7)
50<ν d 6<75 (8)
where νd3: Abbe number of the third lens at d-ray νd4: Abbe number of the fourth lens at d-ray νd5: Abbe number of the fifth lens at d-ray νd6: Abbe number of the sixth lens at d-ray.Join the waitlist — get patent alerts
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