CN115047605A - Imaging lens - Google Patents

Imaging lens Download PDF

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Publication number
CN115047605A
CN115047605A CN202210781480.4A CN202210781480A CN115047605A CN 115047605 A CN115047605 A CN 115047605A CN 202210781480 A CN202210781480 A CN 202210781480A CN 115047605 A CN115047605 A CN 115047605A
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lens
positive
lens group
convex
image
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CN115047605B (en
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陈明君
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Hubei Zhunshi Optoelectronic Technology Co ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
    • G02B15/1435—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative
    • G02B15/143507—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative arranged -++
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

An imaging lens comprises a front lens group, a middle lens group and a rear lens group which are sequentially arranged from an object side to an image side, wherein the focal power of the front lens group is negative, the focal power of the middle lens group is positive, and the focal power of the rear lens group is positive; the front lens group consists of a positive first lens, a negative second lens and a negative third lens; the middle lens group consists of a positive fourth lens, a positive fifth lens and a positive sixth lens; the rear lens group consists of a positive seventh lens, a positive eighth lens and a positive ninth lens; the diaphragm is positioned between the middle lens group and the rear lens group. The second lens is glued with the third lens; the fourth lens is glued with the fifth lens; the seventh lens is cemented with the eighth lens. When the angle of field of the imaging lens is up to 134 degrees, the actual image height is only 1.626 mm.

Description

Imaging lens
Technical Field
The invention relates to an imaging lens, in particular to a large-field-angle imaging lens which can be used for monitoring, measuring or low earth orbit satellites.
Background
The imaging lens is widely applied in life, an ultra-wide angle is often needed to obtain patterns with a larger visual angle in monitoring or aerial measurement, the visual angle of the existing imaging lens is generally not large enough, the image height of the existing wide-angle lens is often larger under the condition of obtaining a large visual angle, and the size of a required imaging element (such as a CCD) is also larger when a large visual angle is shot, for example, the aerial camera lens of CN206411328U, the visual angle is only 95 degrees, and the image plane size is as high as H =3.884 mm. When a large scene needs to be shot, image splicing needs to be carried out after multiple times of shooting, or a large imaging element is needed.
Disclosure of Invention
To overcome the above problems, the present invention provides an imaging lens capable of obtaining an ultra-large angle of view while suppressing an image plane height and capable of imaging with a small imaging element.
The imaging lens comprises a front lens group, a middle lens group and a rear lens group which are sequentially arranged from an object side to an image side, wherein the focal power of the front lens group is negative, the focal power of the middle lens group is positive, and the focal power of the rear lens group is positive; the front lens group consists of a first lens, a second lens and a third lens; the middle lens group consists of a fourth lens, a fifth lens and a sixth lens; the rear lens group consists of a seventh lens, an eighth lens and a ninth lens; the diaphragm is positioned between the middle lens group and the rear lens group. And the lens module further comprises a filter and an image plane.
Wherein:
the first lens is a positive lens, the object side surface is a convex surface, and the image side surface is a concave surface;
the second lens is a negative lens, the object side surface is a concave surface, and the image side surface is a concave surface;
the third lens is a negative lens, the object side surface is a convex surface, and the image side surface is a concave surface;
the fourth lens is a positive lens, the object side surface is a convex surface, and the image side surface is a concave surface;
the fifth lens is a positive lens, the object side surface is a convex surface, and the image side surface is a convex surface;
the sixth lens is a positive lens, the object side surface is a convex surface, and the image side surface is a convex surface;
the seventh lens is a positive lens, the object side surface is a convex surface, and the image side surface is a concave surface;
the eighth lens element is a positive lens element, and has a convex object-side surface and a convex image-side surface.
The ninth lens element is a positive lens element, and has a convex object-side surface and a concave image-side surface.
The second lens is glued with the third lens; the fourth lens is glued with the fifth lens; the seventh lens is cemented with the eighth lens.
The lens module according to the present disclosure may satisfy the following conditional expression (1):
310<f1/f<311
-33<f2/f<30
-1<f3/f<-0.8
-0.5mm<f23 <-0.2mm
-0.5 mm <f13<-0.3 mm （1）
the conditional expression (1) limits the ratio and the range of partial focal lengths of the front lens group, and when the conditional expression (1) is satisfied, an ultra-large field angle can be obtained, and the light rays incident with the large field angle can be deflected into paraxial light rays as soon as possible, so that aberration correction is facilitated, and the actual image height is small.
The lens module according to the present disclosure may satisfy the following conditional expression (2):
80<f4/f<85
80<f5/f<82
25<f6/f<27
16 mm <f45<18 mm
6 mm <f46<7 mm （2）
the conditional expression (2) limits the ratio and the range of partial focal lengths of the middle lens group, and when the conditional expression is satisfied, marginal field light rays can be further compressed, and the image height is reduced.
The lens module according to the present disclosure may satisfy the following conditional expression (3):
40<f7/f<43
20<f8/f<23
20<f9/f<22
8 mm <f78 <10 mm
3 mm <f79<5 mm （3）
the conditional expression (3) limits the ratio and the range of partial focal length of the rear lens group, and when the conditional expression is satisfied, the marginal field light can be converged and imaged, so that the field angle is increased, the aberration correction is facilitated, and the image height is reduced.
The lens module according to the present disclosure may satisfy the following conditional expression (4):
FOV>130°
H<1.8mm （4）
the imaging lens of the invention can obtain an ultra-wide angle and simultaneously has a very small actual image height.
The lens module according to the present disclosure may satisfy the following conditional expression (5):
n7>1.95
n8>1.95 （5）
according to the imaging lens, an ultra-large visual angle can be obtained, meanwhile, the height of an image plane is restrained, and imaging can be achieved through a small imaging element. The FOV of the field angle can reach 134 degrees, the actual image height H is less than 1.8mm, and aberration can be well corrected.
Drawings
FIG. 1 is a block diagram of an embodiment of an imaging lens of the present application;
FIG. 2 is a view angle data diagram of FIG. 1;
wherein, L1-L9 represent the first to ninth lenses, STO represents the diaphragm, S1-S18 represent the serial numbers of all surfaces, IMG represents the image plane, G1 is the front lens group, G2 is the middle lens group, G3 is the rear lens group, A is the central ray, B is the edge ray of 67 degrees.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
Referring to fig. 1-2, the present application discloses an imaging lens comprising a front lens group G1, a middle lens group G2, and a rear lens group G3 arranged in order from an object side to an image side, wherein the focal power of the front lens group G1 is negative, the focal power of the middle lens group G2 is positive, and the focal power of the rear lens group G3 is positive; wherein the front lens group G1 is composed of a first lens L1, a second lens L2, and a third lens L3; the middle lens group G2 is composed of a fourth lens L4, a fifth lens L5, and a sixth lens L6; the rear lens group G3 is composed of a seventh lens L7, an eighth lens L8, and a ninth lens L9; the stop STO is located between the middle lens group G2 and the rear lens group G3. And the lens module further comprises a filter and an image plane IMG.
Wherein:
the first lens element L1 is a positive lens element, the object-side surface S1 is convex, and the image-side surface S2 is concave;
the second lens L2 is a negative lens, the object-side surface S3 is concave, and the image-side surface S4 is concave;
the third lens element L3 is a negative lens element, the object-side surface S4 is convex, and the image-side surface S5 is concave;
the fourth lens element L4 is a positive lens element, the object-side surface S6 is convex, and the image-side surface S7 is concave;
the fifth lens element L5 is a positive lens element, and has a convex object-side surface S7 and a convex image-side surface S8;
the sixth lens element L6 is a positive lens element, the object-side surface S9 is convex, and the image-side surface S10 is convex;
the seventh lens element L7 is a positive lens element, the object-side surface S12 is convex, and the image-side surface S13 is concave;
the eighth lens element L8 is a positive lens element, the object-side surface S13 is convex, and the image-side surface S14 is convex.
The ninth lens element L9 is a positive lens element, and has a convex object-side surface S15 and a concave image-side surface S16.
And the second lens L2 is cemented with the third lens L3; the fourth lens L4 is cemented with the fifth lens L5; the seventh lens L7 is cemented with the eighth lens L8.
The object-side surface and the image-side surface are convex or concave, and the portions of the object-side surface and the image-side surface of the lens close to the optical axis are convex or concave according to the conventional understanding in the art.
Further, it should be noted that, in this specification, the first lens denotes a lens closest to the object side, and the eighth lens denotes a lens closest to the image sensor. In the present specification, the unit of the numerical value of the radius of curvature, the numerical value of the thickness, and the numerical value of the thickness of the lens may be mm.
The lens module according to the present disclosure may satisfy the following conditional expression (1):
310<f1/f<311
-33<f2/f<30
-1<f3/f<-0.8
-0.5mm<f23 <-0.2mm
-0.5 mm <f13<-0.3 mm （1）
the conditional expression (1) defines the ratio and the range of the partial focal length of the front lens group G1, and when the above expression is satisfied, an ultra-large angle of view can be obtained, and the light incident with a large angle of view can be deflected as paraxial light as early as possible, which is advantageous for aberration correction, and the actual image height is made small.
The lens module according to the present disclosure may satisfy the following conditional expression (2):
80<f4/f<85
80<f5/f<82
25<f6/f<27
16 mm <f45<18 mm
6 mm <f46<7 mm （2）
the conditional expression (2) defines the ratio and the range of the partial focal length of the middle lens group G2, and when the conditional expression is satisfied, the marginal field light can be further compressed, and the image height can be reduced.
The lens module according to the present disclosure may satisfy the following conditional expression (3):
40<f7/f<43
20<f8/f<23
20<f9/f<22
8 mm <f78 <10 mm
3 mm <f79<5 mm （3）
the conditional expression (3) defines the ratio and the range of the partial focal length of the rear lens group G3, and when the conditional expression is satisfied, the peripheral field rays can be converged and imaged, the field angle can be increased, which is favorable for aberration correction and image height reduction.
The lens module according to the present disclosure may satisfy the following conditional expression (4):
FOV>130°
H<1.8mm （4）
the imaging lens of the invention can obtain an ultra-wide angle and simultaneously has a very small actual image height.
In FIGS. 1-2, the A position is the central ray and the incident angle is 0 °; and B is an edge ray, and the included angle of the edge ray relative to the optical axis of the lens module is 67 degrees, so the field angle of the lens module is 134 degrees.
The lens module according to the present disclosure may satisfy the following conditional expression (5):
n7>1.95
n8>1.95 （5）
here, n7 is a refractive index of the seventh lens L7, and n8 is a refractive index of the eighth lens L8. When the above formula is satisfied, the imaging lens has a smaller back focal length, which is beneficial to reducing the size of the lens.
This application adopts three groups of cemented lens, is favorable to proofreading and correct the colour difference.
Table 1 shows parameters of the imaging optical system (surface number, radius of curvature, thickness of lens, distance between lenses, refractive index of lens, abbe number of lens, where length units are all mm, entrance pupil diameter is 0.1 mm).
[ Table 1]
Figure DEST_PATH_IMAGE002
Table 2 shows aspheric coefficients adopted by the imaging optical system, and the function expression of the aspheric surface is:
Figure DEST_PATH_IMAGE004
。
the aspherical coefficients are as follows: [ Table 2]
Surface number K A2 A4 A6 A8 A10 A12 A14 A16
S3 0.1 -0.0032 0.00016 -0.000054 -6.3E-08 -7.0E-09 3.5E-12 0.000000 0.000000
S5 3.6 3.0 -2.0 0.36 -0.01 -9.0E-08 -9.0E-12 -2.0E-12 -1.5E-09
S10 0.012 0.0012 0.00042 -0.0001 -6.5E-008 0.000000 0.000000 0.000000 0.000000
S15 -0.12 -0.02 -0.0008 -0.00026 -0.00002 0.000000 0.000000 0.000000 0.000000
S16 0.2 -0.0002 0.007 -0.0009 0.00003 0.000000 0.000000 0.000000 0.000000
Table 3 shows the optical parameters of the lens module of this embodiment.
[ Table 3]
f1 122.444 f5 31.522
f2 -12.99 f6 10.63
f3 -0.316 f7 16.922
f4 32.67 f8 9.06
f9 8.553 f 0.394
f23 -0.303 f13 -0.307
f45 16.294 f46 6.691
f78 8.298 f79 4.274
f1/f 310.772 f6/f 26.98
f2/f -32.97 f7/f 42.95
f3/f -0.802 f8/f 22.995
f4/f 82.919 f9/f 21.708
f5/f 80.005 H 1.626
f 1-f 9 are focal lengths of the lenses, f13 is a focal length of the front lens group G1, f46 is a focal length of the middle lens group G2, f79 is a focal length of the rear lens group G3, f23, f45 and f78 are focal lengths of cemented lenses of the second lens and the third lens, the fourth lens and the fifth lens, and the seventh lens and the eighth lens, respectively, f is a focal length of the whole imaging optical system, and H is an actual image height.
While the above exemplary embodiments have been shown and described, it will be apparent to those skilled in the art that modifications and variations can be made thereto without departing from the spirit and scope of the disclosure as defined by the appended claims.

Claims (9)

1. An imaging lens comprises a front lens group, a middle lens group and a rear lens group which are sequentially arranged from an object side to an image side, wherein the focal power of the front lens group is negative, the focal power of the middle lens group is positive, and the focal power of the rear lens group is positive; the front lens group consists of a first lens, a second lens and a third lens; the middle lens group consists of a fourth lens, a fifth lens and a sixth lens; the rear lens group consists of a seventh lens, an eighth lens and a ninth lens; the diaphragm is positioned between the middle lens group and the rear lens group.
2. Wherein:
the first lens is a positive lens, the object side surface is a convex surface, and the image side surface is a concave surface;
the second lens is a negative lens, the object side surface is a concave surface, and the image side surface is a concave surface;
the third lens is a negative lens, the object side surface is a convex surface, and the image side surface is a concave surface;
the fourth lens is a positive lens, the object side surface is a convex surface, and the image side surface is a concave surface;
the fifth lens is a positive lens, the object side surface is a convex surface, and the image side surface is a convex surface;
the sixth lens is a positive lens, the object side surface is a convex surface, and the image side surface is a convex surface;
the seventh lens is a positive lens, the object side surface is a convex surface, and the image side surface is a concave surface;
the eighth lens element is a positive lens element, and has a convex object-side surface and a convex image-side surface.
3. The ninth lens element is a positive lens element, and has a convex object-side surface and a concave image-side surface.
4. The second lens is glued with the third lens; the fourth lens is glued with the fifth lens; the seventh lens is cemented with the eighth lens.
5. An imaging lens according to claim 1, characterized in that the front lens group satisfies the following conditional expression (1):
310<f1/f<311
-33<f2/f<30
-1<f3/f<-0.8
-0.5mm<f23<-0.2mm
-0.5 mm<f13<-0.3 mm （1）。
6. the imaging lens according to claim 1, characterized in that the middle lens module satisfies the following conditional expression (2):
80<f4/f<85
80<f5/f<82
25<f6/f<27
16mm<f45<18mm
6mm <f46<7mm （2）。
7. an imaging lens according to claim 1, characterized in that the rear lens group satisfies the following conditional expression (3):
40<f7/f<43
20<f8/f<23
20<f9/f<22
8mm<f78<10mm
3mm<f79<5mm （3）。
8. the imaging lens according to any one of claims 1, characterized in that the lens module further satisfies the following conditional expression (4):
FOV>130°
H<1.8mm （4）。
9. the imaging lens according to any one of claims 1 to 4, characterized in that the following conditional expression (5) is satisfied:
n7>1.95
n8>1.95 （5）。
CN202210781480.4A 2022-07-05 2022-07-05 Imaging lens Active CN115047605B (en)

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JP2007304241A (en) * 2006-05-10 2007-11-22 Pentax Corp Zoom lens system
JP2010175581A (en) * 2009-01-27 2010-08-12 Panasonic Corp Zoom lens and electronic device using same
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CN106030367A (en) * 2014-07-09 2016-10-12 奥林巴斯株式会社 Endoscope objective optical system
CN111427134A (en) * 2020-05-26 2020-07-17 浙江舜宇光学有限公司 Optical imaging lens group
CN111929848A (en) * 2020-09-22 2020-11-13 王振 Wide-angle imaging optical system
CN111965796A (en) * 2020-09-17 2020-11-20 马翠娟 Ultra-wide angle imaging optical system
WO2021238648A1 (en) * 2020-05-28 2021-12-02 江西联创电子有限公司 Optical imaging lens and imaging device

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000056217A (en) * 1998-08-10 2000-02-25 Nikon Corp Wide angle lens system
JP2000089110A (en) * 1998-09-11 2000-03-31 Canon Inc Zoom lens
JP2001228391A (en) * 2000-02-16 2001-08-24 Asahi Optical Co Ltd Wide-angle lens system
US20050046959A1 (en) * 2003-08-28 2005-03-03 Masahiro Katakura Zoom lens, and electronic imaging system incorporating the same
JP2007304241A (en) * 2006-05-10 2007-11-22 Pentax Corp Zoom lens system
JP2010175581A (en) * 2009-01-27 2010-08-12 Panasonic Corp Zoom lens and electronic device using same
CN203337908U (en) * 2013-07-26 2013-12-11 秦皇岛视听机械研究所 Eight-stack nine-patch digital short-focus projection lens infrastructure
CN106030367A (en) * 2014-07-09 2016-10-12 奥林巴斯株式会社 Endoscope objective optical system
CN104297909A (en) * 2014-11-11 2015-01-21 厦门力鼎光电技术有限公司 Large-light-flux high-resolution zoom lens
CN204705759U (en) * 2015-06-26 2015-10-14 浙江大华技术股份有限公司 A kind of lens combination and camera lens
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CN111929848A (en) * 2020-09-22 2020-11-13 王振 Wide-angle imaging optical system

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