CN115390224B - Zero-temperature-drift multi-scene image detection optical system - Google Patents
Zero-temperature-drift multi-scene image detection optical system Download PDFInfo
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- 230000003287 optical effect Effects 0.000 title claims abstract description 31
- 238000001514 detection method Methods 0.000 title claims abstract description 25
- 230000005499 meniscus Effects 0.000 claims abstract description 69
- 239000005308 flint glass Substances 0.000 claims description 21
- 229910052746 lanthanum Inorganic materials 0.000 claims description 18
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 18
- 230000004075 alteration Effects 0.000 claims description 17
- 239000005331 crown glasses (windows) Substances 0.000 claims description 12
- 239000005357 flat glass Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 239000011574 phosphorus Substances 0.000 claims description 6
- 239000006185 dispersion Substances 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 abstract description 11
- 238000010586 diagram Methods 0.000 description 6
- 238000007689 inspection Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 201000009310 astigmatism Diseases 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000004304 visual acuity Effects 0.000 description 1
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- 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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
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Abstract
The invention relates to a zero-temperature-drift multi-scene image detection optical system, which sequentially comprises the following components in the incident direction of light rays from left to right: front group A, diaphragm C, back group B, the total focal power of front group A is positive, the total focal power of back group B is negative; the front group A sequentially comprises a biconvex positive lens A-1, a meniscus negative lens A-2, a biconcave negative lens A-3, a biconvex positive lens A-4 and a biconvex positive lens A-5 from left to right; the rear group B comprises a biconcave negative lens B-1, a biconvex positive lens B-2, a biconvex positive lens B-3, a biconvex positive lens B-4, a meniscus negative lens B-5 and a meniscus positive lens B-6 from left to right in sequence; the front group A, the diaphragm C, the biconcave negative lens B-1, the biconvex positive lens B-2, the biconvex positive lens B-3 and the biconvex positive lens B-4 form a focusing moving group I, and the meniscus negative lens B-5 and the meniscus positive lens B-6 form a fixed group II. The invention can make the lens perform athermalized high-definition imaging under different object distances and different view scenes by focusing the moving group one.
Description
Technical Field
The invention relates to a zero-temperature-drift multi-scene image detection optical system.
Background
Along with the improvement of the industrial automation level in China, more and more machine vision imaging lenses are applied to the field of industrial automation detection, and the production efficiency is greatly improved. At present, the machine vision inspection lens is not only applied to mass production and picking operation, but also widely applied to various high-precision detection instruments. In addition, there are many applications of machine vision inspection lenses in multi-scene slope and surface inspection, multi-dimensional imaging, near and far functional inspection. However, such lenses often have the characteristics of single working object distance and working scene and high requirements on detection environment and detection conditions, and there is a few lenses which can simultaneously maintain excellent image detection performance in various object distance scenes and different working temperature environments.
Disclosure of Invention
In view of the defects in the prior art, the technical problem to be solved by the invention is to provide a zero-temperature-drift multi-scene image detection optical system.
In order to solve the technical problems, the technical scheme of the invention is as follows: the utility model provides a zero temperature floats many scene inspection optical system, the optical system of camera lens includes along light from left to right incident direction in proper order: front group A, diaphragm C, back group B, the total focal power of front group A is positive, the total focal power of back group B is negative; the front group A sequentially comprises a biconvex positive lens A-1, a meniscus negative lens A-2, a biconcave negative lens A-3, a biconvex positive lens A-4 and a biconvex positive lens A-5 from left to right; the rear group B sequentially comprises a biconcave negative lens B-1, a biconvex positive lens B-2, a biconvex positive lens B-3, a biconvex positive lens B-4, a meniscus negative lens B-5 and a meniscus positive lens B-6 from left to right; wherein the front group A, the diaphragm C, the biconcave negative lens B-1, the biconvex positive lens B-2, the biconvex positive lens B-3 and the biconvex positive lens B-4 form a focusing moving group I, the meniscus negative lens B-5 and the meniscus positive lens B-6 form a fixed group II, and the focusing moving group I has a focal length F 1 And focal length F of fixed group II 2 Satisfies the following relation that-73.5 is less than F 2 /F 1 ＜-71.8。
Preferably, the biconcave negative lens A-3 and the biconvex positive lens A-4 in the front group A with positive focal power form a front group close-contact bonding lens I, the bonding surface of the front group is bent to one side of the diaphragm, and the biconcave negative lens B-1 and the biconvex positive lens B-2 form a rear group close-contact bonding lens II, and the bonding surface of the rear group is opposite to one side of the diaphragm.
Preferably, the first cemented lens of the front group A is cemented by a material having a close refractive index and a large difference in dispersion coefficient, and the first cemented lens has a focal length f 1 The following relation is satisfied with the lens focal length f: -11.2 < f 1 And/f < -10.6; the second cemented lens of the rear group B is cemented by a material with large refractive index difference and large chromatic aberration coefficient difference, and the focal length f of the second cemented lens is tightly adhered 2 The following relation is satisfied with the lens focal length f: -1.9 < f 2 /f＜-1.7。
Preferably, the thickness of the lens of the biconvex positive lens A-1 in the front group A is 2.91mm, the thickness of the lens of the meniscus negative lens A-2 is 1.3mm, the thickness of the lens of the biconcave negative lens A-3 is 1.65mm, the thickness of the lens of the biconvex positive lens A-4 is 9.06mm, and the thickness of the lens of the biconvex positive lens A-5 is 4.34mm; the thickness of the lens of the biconcave negative lens B-1 in the rear group B was 0.7mm, the thickness of the lens of the biconvex positive lens B-2 was 3.93mm, the thickness of the lens of the biconvex positive lens B-3 was 3.25mm, the thickness of the lens of the biconvex positive lens B-4 was 2.21mm, the thickness of the lens of the meniscus negative lens B-5 was 1.34mm, the thickness of the lens of the meniscus positive lens B-6 was 4.1mm, and the thickness of the lens of the flat glass was 0.7mm.
Preferably, the left spherical surface R value of the biconvex positive lens A-1 in the front lens group A satisfies 87.5 < R < 90.2, and the right spherical surface R value satisfies-460.5 < R < -453.5; the left spherical surface R value of the meniscus negative lens A-2 is more than 79.8 and less than 83.6, and the right spherical surface R value is more than 13.1 and less than 15.3; the R value of the left spherical surface of the biconcave negative lens A-3 is more than-16.8 and less than-15.7, and the R value of the right spherical surface is more than 21.3 and less than 23.5; the R value of the left spherical surface of the biconvex positive lens A-4 is more than 21.3 and less than 23.5, and the R value of the right spherical surface is more than-21.5 and less than-20.5; the left spherical surface R value of the biconvex positive lens A-5 is more than 25.1 and less than 26.6, and the right spherical surface R value is more than-3050 and less than R and less than-2950.
Preferably, the left spherical surface R value of the biconcave negative lens B-1 in the rear lens group B is more than-13.1 and less than-12.1, and the right spherical surface R value is more than 21.5 and less than 22.8; the R value of the left spherical surface of the biconvex positive lens B-2 is more than 21.5 and less than 22.8, and the R value of the right spherical surface is more than-17.2 and less than-15.8; the R value of the left spherical surface of the biconvex positive lens B-3 is more than 56.2 and less than 58.6, and the R value of the right spherical surface is more than-38.5 and less than-36.8; the left spherical surface R value of the biconvex positive lens B-4 is 78.4 < R < 81.2, and the right spherical surface R value is-208.5 < R < -205.6; the left spherical surface R value of the meniscus negative lens B-5 is more than 20.8 and less than 21.8, and the right spherical surface R value is more than 14.2 and less than 15.3; the left spherical surface R value of the meniscus positive lens B-6 is more than 21.8 and less than 23.3, and the right spherical surface R value is more than 39.1 and less than 40.7.
Preferably, the biconvex positive lens a-1 in the front lens group a is heavy lanthanum flint glass with refractive index nd=1.88; the meniscus negative lens A-2 is lanthanum crown glass with refractive index Nd=1.69; biconcave negative lens a-3 is flint glass with refractive index nd=1.64; the biconvex positive lens A-4 is dense phosphorus crown glass with a refractive index Nd=1.59; the biconvex positive lens a-5 is a heavy lanthanum flint glass having a refractive index nd=1.95.
Preferably, the biconcave negative lens B-1 in the rear lens group B is a heavy flint glass having a refractive index nd=1.85, the biconvex positive lens B-2 is a heavy phosphorus crown glass having a refractive index nd=1.59, the biconvex positive lens B-3 is a heavy lanthanum flint glass having a refractive index nd=1.95, the biconvex positive lens B-4 is a heavy lanthanum flint glass having a refractive index nd=1.90, the meniscus negative lens B-5 is a heavy flint glass having a refractive index nd=1.72, and the meniscus positive lens B-6 is a lanthanum crown glass having a refractive index nd=1.69.
Preferably, in the front lens group A, the air space D=0.1 mm of the biconvex positive lens A-1 to the meniscus negative lens A-2, the air space D=8.04 mm of the meniscus negative lens A-2 to the biconcave negative lens A-3, the air space D=0.1 mm of the biconvex positive lens A-4 to the biconvex positive lens A-5, the air space of the biconvex positive lens A-5 to the diaphragm C is 14.8mm, the air space of the diaphragm C to the biconcave negative lens B-1 is 3.6mm, the air space of the biconvex positive lens B-2 to the biconcave positive lens B-3 is 0.68mm, the air space of the biconvex positive lens B-3 to the biconvex positive lens B-4 is 0.49mm, the air space of the biconvex positive lens B-4 to the meniscus negative lens B-5 is 0.15mm, the air space of the meniscus negative lens B-5 to the meniscus positive lens B-6 is 1.28mm, the air space of the meniscus positive lens B-6 to the glass is 9.75mm, and the air space of the flat glass is 1.75 mm.
Compared with the prior art, the invention has the following beneficial effects:
1. the bonding sheet of the lens corrects chromatic aberration and on-axis secondary spectrum by introducing a material combination with larger Abbe number Vd difference, reduces astigmatism and spherical aberration by adjusting the bending direction of the surface where bonding is positioned, and improves the resolution capability of the lens.
2. The lens adopts a grouping focusing mode to realize the imaging function under the object distance of multiple scenes, a fixed group II with ultra-small focal power is arranged on a meniscus negative lens B-5 and a meniscus positive lens B-6 in a rear group B so as to meet the requirement of large image height imaging, and the focal length F of the group 2 The following relation is satisfied with the lens focal length f: -78.8 < F 2 With the ratio of/f being less than-76.2, the definition change caused by different temperatures in the group moving process can be weakened, athermalization can be realized in each object distance scene, and the focusing movement of the group can be ensuredThe group actuation process maintains the stability of the picture.
The invention will be described in further detail with reference to the drawings and the detailed description.
Drawings
FIG. 1 is a diagram of an optical system according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a Ray Fan aberration diagram according to an embodiment of the present invention;
FIG. 3 is a chart of MTF for a 100mm macro scenario according to an embodiment of the present invention;
FIG. 4 is a chart of MTF at 500mm medium range scenario for an embodiment of the present invention;
FIG. 5 is a chart of MTF for a 2000mm long range scenario in accordance with an embodiment of the present invention;
fig. 6 is a chart of MTF for an infinitely distant object scene in accordance with an embodiment of the present invention.
In the figure: a-1 biconvex positive lens A-1, A-2 meniscus negative lens A-2, A-3 biconcave negative lens A-3, A-4 biconvex positive lens A-4, -5 biconvex positive lens A-5, B-1 biconcave negative lens B-1, B-2 biconvex positive lens B-2, B-3 biconvex positive lens B-3, B-4 biconvex positive lens B-4, B-5 meniscus negative lens B-5, B-6 meniscus positive lens B-6, 1-focus moving group one, 2-stationary group two.
Detailed Description
The invention will be further described with reference to the accompanying drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
As shown in fig. 1 to 6, this embodiment provides a zero-temperature-drift multi-scene image capturing optical system, where the optical system of the lens sequentially includes, along the light incident direction from left to right: front group A, diaphragm C, back group B, the total focal power of front group A is positive, the total focal power of back group B is negative; the front group A sequentially comprises a biconvex positive lens A-1, a meniscus negative lens A-2, a biconcave negative lens A-3, a biconvex positive lens A-4 and a biconvex positive lens A-5 from left to right; the rear group B sequentially comprises a biconcave negative lens B-1, a biconvex positive lens B-2, a biconvex positive lens B-3, a biconvex positive lens B-4, a meniscus negative lens B-5 and a meniscus positive lens B-6 from left to right; the front group A, the diaphragm C, the biconcave negative lens B-1, the biconvex positive lens B-2, the biconvex positive lens B-3 and the biconvex positive lens B-4 form a focusing moving group I, and the group can move left and right along the optical axis direction along with the structural member to perform multi-scene focusing. The negative meniscus lens B-5 and the positive meniscus lens B-6 form a fixed group II, and the focal length F of the focusing moving group I 1 And focal length F of fixed group II 2 Satisfies the following relation that-73.5 is less than F 2 /F 1 ＜-71.8。
The back group B has a fixed group B with ultra-small focal power for high imaging, and the group has a focal length F 2 The following relation is satisfied with the lens focal length f: -78.8 < F 2 And f is less than-76.2, the definition change caused by different temperatures in the group moving process can be weakened, the athermalization of the group moving process can be realized under each object distance scene, and the stability of the picture can be ensured to be kept in the focusing moving group actuating process.
The focal power of the meniscus negative lens A-2 in the front group A can be adjusted to sufficiently correct the low-order sum Gao Jieqiu difference introduced by the biconvex positive lens B-3 and the biconvex positive lens B-4 in the rear group B, so that the imaging quality of the on-axis central view field is sufficiently improved; the biconvex positive lens A-1 of the front group A has the function of distortion correction, can eliminate the distortion of the outer ring view field of the large-image high-view-field optical system, and improves the imaging effect.
The invention can make the lens perform athermalized high-definition imaging under different object distances and different view scenes by focusing the moving group one. The lens adopts eleven spherical lens combinations, a piece of flat glass is arranged behind the lens group, and the lens can be matched with a high-pixel camera for use through the correction balance of monochromatic and complex chromatic aberration of the lens group.
By adopting a combination scheme of a plurality of glass spherical lenses, defocusing and aberration existing under scenes with different object distances are corrected by introducing a focusing movement group, a temperature drift curve is balanced by controlling the refractive index temperature coefficients of positive and negative focal power lenses, and the temperature aberration change under different object distances is eliminated, so that a zero-temperature drift multi-scene high-definition image detection function is realized.
In the embodiment of the invention, the biconvex positive lens A-1 and the meniscus negative lens A-2 are supported by a metal spacing ring, the meniscus negative lens A-2 and the biconcave negative lens A-3 are supported by the edge of the lens, and the biconvex positive lens A-4 and the biconvex positive lens A-5 are supported by a metal spacing ring; the biconvex positive lens B-2 and the biconvex positive lens B-3 are supported by a metal spacer ring, the biconvex positive lens B-3 and the biconvex positive lens B-4 are supported by a metal spacer ring, the biconvex positive lens B-4 and the meniscus negative lens B-5 are supported by a metal spacer ring, and the meniscus negative lens B-5 and the meniscus positive lens B-6 are supported by the edges of the lenses.
In the embodiment of the invention, a biconcave negative lens A-3 and a biconvex positive lens A-4 in a front group A with positive focal power form a front group close-contact bonding lens I, the bonding surface of the front group is bent to one side of a diaphragm, and a biconcave negative lens B-1 and a biconvex positive lens B-2 form a rear group close-contact bonding lens II, and the bonding surface of the rear group close-contact bonding lens II is opposite to one side of the diaphragm.
In the embodiment of the invention, the first cemented lens of the front group A is cemented by adopting a material with a refractive index close to that of the cemented lens and a large difference in dispersion coefficient, so that the chromatic aberration can be effectively reduced, the resolution of the lens can be improved, and the focal length f of the first cemented lens is closely adhered 1 The following relation is satisfied with the lens focal length f: -11.2 < f 1 And/f < -10.6; the second cemented lens of the rear group B is cemented by materials with large refractive index difference and large chromatic aberration coefficient difference, and the on-axis spherical aberration introduced by the front group double convex positive lens A-5 is sufficiently corrected and balanced while the chromatic aberration is reduced, and the focal length f of the second cemented lens is tightly adhered 2 The following relation is satisfied with the lens focal length f: -1.9 < f 2 /f＜-1.7。
In the embodiment of the invention, the thickness of the lens of the biconvex positive lens A-1 in the front group A is 2.91mm, the thickness of the lens of the meniscus negative lens A-2 is 1.3mm, the thickness of the lens of the biconcave negative lens A-3 is 1.65mm, the thickness of the lens of the biconvex positive lens A-4 is 9.06mm, and the thickness of the lens of the biconvex positive lens A-5 is 4.34mm; the thickness of the lens of the biconcave negative lens B-1 in the rear group B was 0.7mm, the thickness of the lens of the biconvex positive lens B-2 was 3.93mm, the thickness of the lens of the biconvex positive lens B-3 was 3.25mm, the thickness of the lens of the biconvex positive lens B-4 was 2.21mm, the thickness of the lens of the meniscus negative lens B-5 was 1.34mm, the thickness of the lens of the meniscus positive lens B-6 was 4.1mm, and the thickness of the lens of the flat glass was 0.7mm.
In the embodiment of the invention, the left spherical surface R value of the biconvex positive lens A-1 in the front lens group A satisfies 87.5 < R < 90.2, and the right spherical surface R value satisfies-460.5 < R < -453.5; the left spherical surface R value of the meniscus negative lens A-2 is more than 79.8 and less than 83.6, and the right spherical surface R value is more than 13.1 and less than 15.3; the R value of the left spherical surface of the biconcave negative lens A-3 is more than-16.8 and less than-15.7, and the R value of the right spherical surface is more than 21.3 and less than 23.5; the R value of the left spherical surface of the biconvex positive lens A-4 is more than 21.3 and less than 23.5, and the R value of the right spherical surface is more than-21.5 and less than-20.5; the left spherical surface R value of the biconvex positive lens A-5 is more than 25.1 and less than 26.6, and the right spherical surface R value is more than-3050 and less than R and less than-2950.
In the embodiment of the invention, the left spherical surface R value of the biconcave negative lens B-1 in the rear lens group B is more than-13.1 and less than-12.1, and the right spherical surface R value is more than 21.5 and less than 22.8; the R value of the left spherical surface of the biconvex positive lens B-2 is more than 21.5 and less than 22.8, and the R value of the right spherical surface is more than-17.2 and less than-15.8; the R value of the left spherical surface of the biconvex positive lens B-3 is more than 56.2 and less than 58.6, and the R value of the right spherical surface is more than-38.5 and less than-36.8; the left spherical surface R value of the biconvex positive lens B-4 is 78.4 < R < 81.2, and the right spherical surface R value is-208.5 < R < -205.6; the left spherical surface R value of the meniscus negative lens B-5 is more than 20.8 and less than 21.8, and the right spherical surface R value is more than 14.2 and less than 15.3; the left spherical surface R value of the meniscus positive lens B-6 is more than 21.8 and less than 23.3, and the right spherical surface R value is more than 39.1 and less than 40.7.
In the embodiment of the invention, the biconvex positive lens A-1 in the front lens group A is heavy lanthanum flint glass with refractive index Nd=1.88; the meniscus negative lens A-2 is lanthanum crown glass with refractive index Nd=1.69; biconcave negative lens a-3 is flint glass with refractive index nd=1.64; the biconvex positive lens A-4 is dense phosphorus crown glass with a refractive index Nd=1.59; the biconvex positive lens a-5 is a heavy lanthanum flint glass having a refractive index nd=1.95.
In the embodiment of the invention, the biconcave negative lens B-1 in the rear lens group B is heavy flint glass with a refractive index Nd=1.85, the biconvex positive lens B-2 is heavy phosphorus crown glass with a refractive index Nd=1.59, the biconvex positive lens B-3 is heavy lanthanum flint glass with a refractive index Nd=1.95, the biconvex positive lens B-4 is heavy lanthanum flint glass with a refractive index Nd=1.90, the meniscus negative lens B-5 is heavy flint glass with a refractive index Nd=1.72, and the meniscus positive lens B-6 is lanthanum crown glass with a refractive index Nd=1.69.
In the embodiment of the invention, in the front lens group A, the air space D between the biconvex positive lens A-1 and the biconcave negative lens A-2 is=0.1 mm, the air space D between the biconvex negative lens A-2 and the biconcave negative lens A-3 is=8.04 mm, the air space D between the biconvex positive lens A-4 and the biconvex positive lens A-5 is=0.1 mm, the air space between the biconvex positive lens A-5 and the diaphragm C is 14.8mm, the air space between the diaphragm C and the biconcave negative lens B-1 is 3.6mm, the air space between the biconvex positive lens B-2 and the biconcave positive lens B-3 is 0.68mm, the air space between the biconvex positive lens B-3 and the biconcave positive lens B-4 is 0.49mm, the air space between the biconvex positive lens B-4 and the biconcave negative lens B-5 is 0.15mm, the air space between the meniscus negative lens B-5 and the meniscus positive lens B-6 is 1.28mm, the air space between the biconvex positive lens B-6 and the diaphragm C is 9.75mm, and the air space between the biconvex positive lens B-6 and the diaphragm glass is 1.75 mm.
In the embodiment of the invention, the optical indexes realized by the optical lens parameters are as follows:
1. focal length: 16mm;
2. an aperture: f2.0;
3. angle of view: 2w is more than or equal to 58.1 degrees;
4. working distance scene range: 90mm to infinity;
5. working spectral range: visible light;
6. maximum imaging circle diameter: and is more than or equal to 17.6mm.
In the embodiment of the present invention, parameters of each lens are shown in the following table, and each air interval D and curvature unit shown in the following table are mm, and the surface serial numbers of each lens are sequentially arranged in the order from left to right shown in fig. 1:
TABLE 1
The optical path and the related parameter diagrams of the zero-temperature-drift multi-scene image detection optical system shown in table 1 and fig. 1 are concise in optical path structure and good in assembly manufacturability.
The Ray Fan aberration diagram of the zero-temperature-drift multi-scene image detection optical system shown in fig. 2 shows that the on-axis and off-axis spherical aberration of the optical image detection system are sufficiently corrected.
The MTF diagram of the zero-temperature drift multi-scene image detection optical system shown in fig. 3, 4 and 5 under each object distance scene shows that the transfer functions on the lens axis and the outside of the lens axis can reach 150lp/mm to be more than 0.3 under the medium distance scene, and the transfer functions on the lens axis and the outside of the lens axis can reach 150lp/mm to be more than 0.2 under the micro-distance scene and the long distance scene, so that the lens has excellent resolving power.
In summary, according to the zero-temperature-drift multi-scene image detection optical system provided by the invention, the lens balances the aberrations of each stage through optimizing the focal power of each lens so as to realize high-resolution imaging under different object distance scenes, and the refractive index temperature change curves of the lens pins of each group are distributed and laid out through the aberration optimization control of the front group, the rear group, the fixed group and the focusing moving group, so that the lens has the function of multi-scene zero-temperature drift.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the invention in any way, and any person skilled in the art may make modifications or alterations to the disclosed technical content to the equivalent embodiments. However, any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (9)
1. A zero-temperature-drift multi-scene image detection optical systemThe method is characterized in that: the optical system of the lens sequentially comprises a front group A, a diaphragm C and a rear group B along the incidence direction of light rays from left to right, wherein the total focal power of the front group A is positive, and the total focal power of the rear group B is negative; the front group A consists of a biconvex positive lens A-1, a meniscus negative lens A-2, a biconcave negative lens A-3, a biconvex positive lens A-4 and a biconvex positive lens A-5 in sequence from left to right; the rear group B consists of a biconcave negative lens B-1, a biconvex positive lens B-2, a biconvex positive lens B-3, a biconvex positive lens B-4, a meniscus negative lens B-5 and a meniscus positive lens B-6 in sequence from left to right; wherein the front group A, the diaphragm C, the biconcave negative lens B-1, the biconvex positive lens B-2, the biconvex positive lens B-3 and the biconvex positive lens B-4 form a focusing moving group I, the meniscus negative lens B-5 and the meniscus positive lens B-6 form a fixed group II, and the focusing moving group I has a focal length F 1 And focal length F of fixed group II 2 The following relation is satisfied: -73.5 < F 2 /F 1 ＜-71.8。
2. The zero-temperature-drift multi-scene-detection optical system of claim 1, wherein: the biconcave negative lens A-3 and the biconvex positive lens A-4 in the front group A with positive focal power form a front group close-contact bonding lens I, the bonding surface is bent to one side of the diaphragm, and the biconcave negative lens B-1 and the biconvex positive lens B-2 form a rear group close-contact bonding lens II, and the bonding surface is back to one side of the diaphragm.
3. The zero-temperature-drift multi-scene-detection optical system of claim 2, wherein: the first cemented lens of the front group A is cemented by materials with close refractive indexes and large difference in dispersion coefficients, and the first cemented lens has a focal length f 1 The following relation is satisfied with the lens focal length f: -11.2 < f 1 And/f < -10.6; the second cemented lens of the rear group B is cemented by a material with large refractive index difference and large chromatic aberration coefficient difference, and the focal length f of the second cemented lens is tightly adhered 2 The following relation is satisfied with the lens focal length f: -1.9 < f 2 /f＜-1.7。
4. The zero-temperature-drift multi-scene-detection optical system of claim 1, wherein: the thickness of the lens of the biconvex positive lens A-1 in the front group A is 2.91mm, the thickness of the lens of the meniscus negative lens A-2 is 1.3mm, the thickness of the lens of the biconcave negative lens A-3 is 1.65mm, the thickness of the lens of the biconvex positive lens A-4 is 9.06mm, and the thickness of the lens of the biconvex positive lens A-5 is 4.34mm; the thickness of the lens of the biconcave negative lens B-1 in the rear group B was 0.7mm, the thickness of the lens of the biconvex positive lens B-2 was 3.93mm, the thickness of the lens of the biconvex positive lens B-3 was 3.25mm, the thickness of the lens of the biconvex positive lens B-4 was 2.21mm, the thickness of the lens of the meniscus negative lens B-5 was 1.34mm, the thickness of the lens of the meniscus positive lens B-6 was 4.1mm, and the thickness of the lens of the flat glass was 0.7mm.
5. The zero-temperature-drift multi-scene-detection optical system of claim 1, wherein: the left spherical surface R value of the biconvex positive lens A-1 in the front lens group A satisfies 87.5 < R < 90.2, and the right spherical surface R value satisfies-460.5 < R < -453.5; the left spherical surface R value of the meniscus negative lens A-2 is more than 79.8 and less than 83.6, and the right spherical surface R value is more than 13.1 and less than 15.3; the R value of the left spherical surface of the biconcave negative lens A-3 is more than-16.8 and less than-15.7, and the R value of the right spherical surface is more than 21.3 and less than 23.5; the R value of the left spherical surface of the biconvex positive lens A-4 is more than 21.3 and less than 23.5, and the R value of the right spherical surface is more than-21.5 and less than-20.5; the left spherical surface R value of the biconvex positive lens A-5 is more than 25.1 and less than 26.6, and the right spherical surface R value is more than-3050 and less than R and less than-2950.
6. The zero-temperature-drift multi-scene-detection optical system of claim 1, wherein: the left spherical surface R value of the biconcave negative lens B-1 in the rear lens group B is more than-13.1 and less than-12.1, and the right spherical surface R value is more than 21.5 and less than 22.8; the R value of the left spherical surface of the biconvex positive lens B-2 is more than 21.5 and less than 22.8, and the R value of the right spherical surface is more than-17.2 and less than-15.8; the R value of the left spherical surface of the biconvex positive lens B-3 is more than 56.2 and less than 58.6, and the R value of the right spherical surface is more than-38.5 and less than-36.8; the left spherical surface R value of the biconvex positive lens B-4 is 78.4 < R < 81.2, and the right spherical surface R value is-208.5 < R < -205.6; the left spherical surface R value of the meniscus negative lens B-5 is more than 20.8 and less than 21.8, and the right spherical surface R value is more than 14.2 and less than 15.3; the left spherical surface R value of the meniscus positive lens B-6 is more than 21.8 and less than 23.3, and the right spherical surface R value is more than 39.1 and less than 40.7.
7. The zero-temperature-drift multi-scene-detection optical system of claim 1, wherein: the biconvex positive lens a-1 in the front lens group a is heavy lanthanum flint glass with refractive index nd=1.88; the meniscus negative lens A-2 is lanthanum crown glass with refractive index Nd=1.69; biconcave negative lens a-3 is flint glass with refractive index nd=1.64; the biconvex positive lens A-4 is dense phosphorus crown glass with a refractive index Nd=1.59; the biconvex positive lens a-5 is a heavy lanthanum flint glass having a refractive index nd=1.95.
8. The zero-temperature-drift multi-scene-detection optical system of claim 1, wherein: the biconcave negative lens B-1 in the lens rear group B is a heavy flint glass having a refractive index nd=1.85, the biconvex positive lens B-2 is a heavy phosphorus crown glass having a refractive index nd=1.59, the biconvex positive lens B-3 is a heavy lanthanum flint glass having a refractive index nd=1.95, the biconvex positive lens B-4 is a heavy lanthanum flint glass having a refractive index nd=1.90, the meniscus negative lens B-5 is a heavy flint glass having a refractive index nd=1.72, and the meniscus positive lens B-6 is a lanthanum crown glass having a refractive index nd=1.69.
9. The zero-temperature-drift multi-scene-detection optical system of claim 1, wherein: in the lens front group A, the air space D of the biconvex positive lens A-1 to the biconcave negative lens A-2 is=0.1 mm, the air space D of the biconcave negative lens A-2 to the biconcave negative lens A-3 is=8.04 mm, the air space D of the biconvex positive lens A-4 to the biconvex positive lens A-5 is=0.1 mm, the air space of the biconvex positive lens A-5 to the diaphragm C is 14.8mm, the air space of the diaphragm C to the biconcave negative lens B-1 is 3.6mm, the air space of the biconvex positive lens B-2 to the biconvex positive lens B-3 is 0.68mm, the air space of the biconvex positive lens B-3 to the biconcave positive lens B-4 is 0.49mm, the air space of the biconvex positive lens B-4 to the biconcave negative lens B-5 is 0.15mm, the air space of the meniscus negative lens B-5 to the meniscus positive lens B-6 is 1.28mm, the air space of the meniscus positive lens B-6 to the flat glass is 9.75mm, and the air space of the flat glass to the image plane is 1mm.
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| JP2008158320A (en) * | 2006-12-25 | 2008-07-10 | Tamron Co Ltd | Zoom lens |
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| CN108254881A (en) * | 2018-03-27 | 2018-07-06 | 浙江大华技术股份有限公司 | A kind of optical lens |
| CN215813531U (en) * | 2021-09-28 | 2022-02-11 | 福建师范大学 | Short-focus wide-working-distance machine vision lens |
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| JP2008158320A (en) * | 2006-12-25 | 2008-07-10 | Tamron Co Ltd | Zoom lens |
| JP2018045184A (en) * | 2016-09-16 | 2018-03-22 | 株式会社ｎｉｔｔｏｈ | Image capturing optical system and image capturing device |
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