CN109324402B - Visible light near-infrared broadband apochromatism continuous zooming optical lens - Google Patents
Visible light near-infrared broadband apochromatism continuous zooming optical lens Download PDFInfo
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- CN109324402B CN109324402B CN201811315701.9A CN201811315701A CN109324402B CN 109324402 B CN109324402 B CN 109324402B CN 201811315701 A CN201811315701 A CN 201811315701A CN 109324402 B CN109324402 B CN 109324402B
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- 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
- G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
- G02B15/173—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+
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Abstract
The invention relates to a visible light near-infrared broadband apochromatic continuous zooming optical lens, which adopts a method of reasonably matching low-dispersion glass and other optical glass, eliminates the problem of secondary spectrum introduced by the visible light near-infrared broadband, and controls the chromatic aberration of an optical system in a reasonable range; three groups of linked zooming modes in the mechanical compensation zooming method are adopted, so that the length of an optical system is effectively shortened, and high-definition imaging of the whole zooming section is ensured; by adopting the method of setting negative vignetting, the aperture of each zooming position is ensured to be consistent in the whole zooming process, the aperture of the fixed aperture is changed into the F number, and the uniformity of the relative illumination of the image surface at each zooming position is effectively ensured; ensuring that high-definition images can be provided day and night in the whole zoom section; the universal optical glass material and the global design are adopted, so that the cost is reduced, and the optical imaging performance is excellent.
Description
Technical Field
The invention belongs to the optical technology and relates to a visible light near-infrared broadband apochromatic continuous zooming optical lens.
Background
The zoom lens system is an imaging system in which the focal length can be continuously changed, the position of an image plane is kept stable, and the image quality is kept good during zooming. The fixed-focus thermal infrared imager is required to obtain images with different sizes on an image surface, and the distance between a target object and a lens needs to be changed or the lens with different focal lengths needs to be replaced. The continuous zoom lens can continuously change the focal length of the system, so that a target image with continuously changed size can be obtained on an image surface, and the continuous zoom lens is very favorable for photoelectric detection, reconnaissance, tracking and the like. The continuous zoom lens is used as an important part of various photoelectric systems and is widely applied to the fields of photoelectric reconnaissance, monitoring and the like.
With the increasing scale and resolution of CCD and CMOS devices and the demand for photodetection and monitoring under day and night environment conditions, the demand for high resolution of zoom lenses is also becoming stronger.
The invention introduces a design of a visible light near-infrared broadband apochromatic continuous zoom optical lens in detail, the continuous zoom optical lens adopts low dispersion glass to be effectively matched with other optical glass, and the chromatic aberration of an optical system is controlled in a reasonable range; the three groups of linked zooming modes are adopted, so that the length of an optical system is effectively shortened, and high-definition imaging of the whole zooming section is ensured; by using switchable visible light and near infrared filters built in CCD and CMOS devices, high-definition images can be provided day and night in the whole zooming section; the lens adopts the global design of general optical glass materials, thereby reducing the cost and having excellent optical performance.
Disclosure of Invention
Technical problem to be solved
In order to avoid the defects of the prior art, the invention provides a visible light near-infrared broadband apochromatism continuous zooming optical lens.
Technical scheme
A visible light near-infrared broadband apochromatism continuous zooming optical lens is characterized by comprising a front fixed group G1 with positive focal power, a zoom group G2 with negative focal power, a diaphragm, a compensation group G3 with positive focal power, a compensation group G4 with negative focal power and a rear fixed group G5 with positive focal power, which are coaxially arranged in sequence from an object side to an image side along the direction of an optical path; the focal lengths of the front fixed group G1 with positive focal power, the variable power group G2 with negative focal power, the compensation group G3 with positive focal power and the compensation group G4 with negative focal power satisfy the following relations:
0.30≤f1/ft≤0.35
0.55≤f2/f3≤0.60
0.75≤f2/f4≤0.80
wherein f1 is the focal length value of the front fixed group G1 whose focal power is positive; f2 is the focal length value of the variable power group G2 with negative optical power; f3 is the focal length value of the compensation group G3 with positive optical power; f4 is the focal length value of compensation group G4 with negative optical power; ft is the focal length value of the longest focus of the optical lens.
And the rear optical path of the rear fixed group G5 with positive focal power is an image surface of a CCD or a CMOS.
The front fixed group G1 with positive focal power comprises a positive-power double convex lens L11, a negative-power double cemented lens L12 and a positive-power meniscus lens L13 which are coaxially arranged in sequence from the object side to the image side.
The zoom group G2 with negative focal power comprises a negative-power meniscus lens L21, a negative-power triplex cemented lens L22 and a negative-power biconcave lens L23 which are coaxially arranged in sequence from the object side to the image side.
The compensation group G3 with positive focal power comprises a positive focal power double cemented lens L31, a negative focal power double cemented lens L32, a positive focal power double convex lens L33, a negative focal power meniscus lens L34 and a positive focal power meniscus lens L35 which are coaxially arranged in sequence from the object side to the image side.
The compensation group G4 with negative focal power is a negative-focal-power biconcave lens L41.
The rear fixed group G5 having positive power includes a positive power meniscus lens L51 and a positive power meniscus lens L52 coaxially arranged in this order from the object side to the image side.
The front fixed group G1 positive focal power double convex lens L11, the negative focal power double cemented lens L12 and the positive focal power meniscus lens L13 all adopt low dispersion glass HFK61, and the compensation group G3 positive focal power double cemented lens L31 and the positive focal power double convex lens L33 all adopt low dispersion glass HFK 61.
By adopting the method of setting negative vignetting, the aperture of each zooming position is ensured to be consistent in the whole zooming process, the aperture of the fixed aperture is changed into the F number, and the uniformity of the relative illumination of the image surface at each zooming position is effectively ensured.
The working spectral range of the optical system is 486-900 nm, the focal length is 10.266-260 mm, the zoom ratio is 25 times, the relative aperture is 1: 3-1: 6, the optical length is 155mm, and the field angle is 30.8-1.25 degrees.
Advantageous effects
According to the visible light near-infrared broadband apochromatic continuous zooming optical lens, the problem of secondary spectrum introduced by the visible light near-infrared broadband is solved by adopting a method of reasonably matching low-dispersion glass and other optical glass, and the chromatic aberration of an optical system is controlled in a reasonable range; three groups of linked zooming modes in the mechanical compensation zooming method are adopted, so that the length of an optical system is effectively shortened, and high-definition imaging of the whole zooming section is ensured; by adopting the method of setting negative vignetting, the aperture of each zooming position is ensured to be consistent in the whole zooming process, the aperture of the fixed aperture is changed into the F number, and the uniformity of the relative illumination of the image surface at each zooming position is effectively ensured; switching imaging of visible light and near infrared bands is realized through switchable visible light and near infrared filters arranged in CCD and CMOS devices, and high-definition images can be provided day and night in the whole zooming section; the universal optical glass material and the global design are adopted, so that the cost is reduced, and the optical imaging performance is excellent.
The invention has the technical effects that:
1. three groups of linkage continuous zooming: the invention is provided with a front fixed group G1 with positive focal power, a zoom group G2 with negative focal power, a diaphragm, a compensation group G3 with positive focal power, a compensation group G4 with negative focal power and a rear fixed group G5 with positive focal power, wherein the zoom group G2 realizes the compensation of the zoom of the received light, the compensation group G3 and the compensation group G4 on the zoom back light, and the focal length values of the front fixed group G1, the zoom group G2, the compensation group G3 and the compensation group G4 are set, so that the near-infrared broadband complex achromatic aberration and continuous zooming of visible light are finally realized.
2. Eliminating the secondary spectrum: by adopting the method of reasonably matching the low-dispersion glass with other optical glass, the problem of secondary spectrum introduced by visible light near-infrared broadband is solved, and the chromatic aberration of the optical system is well corrected.
3. F number of fixed diaphragm: by adopting the method of setting the negative vignetting, the aperture of each zooming position is consistent in the whole zooming process, the aperture of the diaphragm is fixed and the F number is changed, the uniformity of the relative illumination of the image surface at each zooming position is effectively ensured, the diaphragm changing mechanism is cancelled, and the reliability is improved.
4. Low cost, high workability: the invention uses the full spherical design and adopts the conventional optical glass material, thereby saving the cost on the basis of ensuring the performance.
Drawings
FIG. 1 is a short focal length (10.266mm) optical path diagram of the present invention;
wherein, G1-front fixed group, is composed of 4 groups of lenses L11, L12, L13; g2-zoom group, which consists of 3 groups of lenses L21, L22 and L23; g3-compensation group, which is composed of 5 groups of lenses L31, L32, L33, L34 and L35; g4-compensation group, consisting of 1 lens group L41; g5-rear fixed group, consisting of 2 groups of lenses L51, L52.
FIG. 2 is a diagram of the focal length (100mm) of the present invention;
FIG. 3 is a diagram of the longest focal length (260mm) optical path of the present invention;
FIG. 4 is a graph of the shortest focal length (10.266mm) optical transfer function of the present invention;
FIG. 5 is a graph of the optical transfer function for the focal length (100mm) of the present invention;
FIG. 6 is a graph of the longest focal length (260mm) optical transfer function of the present invention;
FIG. 7 is a graph of shortest focal length (10.266mm) image plane relative illumination according to the present invention;
FIG. 8 is a focal length (100mm) image plane relative illumination diagram according to the present invention;
FIG. 9 is a graph of image plane relative illumination for the longest focal length (260mm) of the present invention.
Detailed Description
The invention will now be further described with reference to the following examples and drawings:
the continuous zoom lens adopts a method of reasonably matching low-dispersion glass and other optical glass, eliminates the problem of secondary spectrum introduced by the visible near-infrared broadband, and controls the chromatic aberration of an optical system in a reasonable range; three groups of linked zooming modes in the mechanical compensation zooming method are adopted, so that the length of an optical system is effectively shortened, and high-definition imaging of the whole zooming section is ensured; by adopting the method of setting negative vignetting, the aperture of each zooming position is ensured to be consistent in the whole zooming process, the aperture of the fixed aperture is changed into the F number, and the uniformity of the relative illumination of the image surface at each zooming position is effectively ensured; switching imaging of visible light and near infrared bands is realized through switchable visible light and near infrared filters arranged in CCD and CMOS devices, and high-definition images can be provided day and night in the whole zooming section; the universal optical glass material and the global design are adopted, so that the cost is reduced, and the optical imaging performance is excellent.
Referring to fig. 1 to 3, an optical path diagram of a visible light near-infrared broadband apochromatic continuous zoom optical lens of the present invention is shown. The optical path direction comprises a front fixed group G1 with positive focal power, a variable power group G2 with negative focal power, a diaphragm, a compensation group G3 with positive focal power, a compensation group G4 with negative focal power, a rear fixed group G5 with positive focal power and an image plane of a CCD or a CMOS which are coaxially arranged in sequence from an object side to an image side. The zoom group G2, the compensation group G3 and the compensation group G4 move relatively with a certain rule in the zooming process, and high-definition imaging in the zooming process of the lens is realized.
The zoom lens system as described above satisfies the following relationship:
0.30≤f1/ft≤0.35
0.55≤f2/f3≤0.60
0.75≤f2/f4≤0.80
wherein f1 is the focal length value of front fixed group G1; f2 is the focal length value of zoom group G2; f3 is the focal length value of compensation group G3; f4 is the focal length value of compensation group G4; ft is the focal length value of the longest focus of the optical lens.
As in the continuous zoom lens described above, the front fixed group G1 includes the positive power double convex lens L11, the negative power double cemented lens L12, and the positive power meniscus lens L13.
As in the continuous zoom lens described above, the magnification-varying group G2 includes the negative power meniscus lens L21, the negative power cemented triplet L22, and the negative power biconcave lens L23.
As in the continuous zoom lens described above, the compensation group G3 includes a positive power double cemented lens L31, a negative power double cemented lens L32, a positive power double convex lens L33, a negative power meniscus lens L34, and a positive power meniscus lens L35.
In the zoom lens system described above, the compensation group G4 is a negative-power biconcave lens L41.
As in the continuous zoom lens described above, the rear fixed group G5 includes the positive power meniscus lens L51, the positive power meniscus lens L52.
In the continuous zoom lens described above, the positive power double-convex lens L11, the negative power double-cemented lens L12, and the positive power meniscus lens L13 of the front fixed group G1, and the positive power double-cemented lens L31 and the positive power double-convex lens L33 of the compensation group G3 all use the low dispersion glass FK 61.
In the embodiment, the working spectral range of the optical system is 486 nm-900 nm, the focal length is 10.266 mm-260 mm, the zoom ratio is 25 times, and the relative aperture is 1: 3-1: 6, the optical length is 155mm, and the field angle is 30.8-1.25 degrees.
Example (b):
the specific data of this example are shown in the following table:
the visible near-infrared broadband apochromatic continuous zoom optical lens of claim 1 has the following design parameters:
optical path optical parameter meter (Unit: mm)
In the table, the radius of curvature refers to the radius of curvature of each surface, and the spacing refers to the distance between two adjacent surfaces, for example, the spacing of the surface S1, i.e., the distance from the surface S1 to the surface S2.
| Focal length (mm) | D12(mm) | D23(mm) | D34(mm) | D45(mm) |
| 10.266 | 2.5 | 68.7 | 2.66 | 7.87 |
| 100 | 36.5 | 22.16 | 10.5 | 12.57 |
| 260 | 39.8 | 2.5 | 18.32 | 21.11 |
Wherein, D12 represents the distance between the front fixed group G1 and the variable magnification group G2; d23 represents the distance between the variable magnification group G2 and the compensation group G3; d34 represents the distance between the compensation group G3 and the compensation group G4; d45 denotes the distance between the compensation group G4 and the rear fixed group G5.
Claims (2)
1. A visible light near-infrared broadband apochromatism continuous zooming optical lens is characterized by comprising a front fixed group (G1) with positive focal power, a zoom group (G2) with negative focal power, a diaphragm, a compensation group (G3) with positive focal power, a compensation group (G4) with negative focal power and a rear fixed group (G5) with positive focal power, which are coaxially arranged in sequence from an object side to an image side along the direction of an optical path; the focal lengths of the front fixed group (G1) with positive focal power, the variable power group (G2) with negative focal power, the compensation group (G3) with positive focal power and the compensation group (G4) with negative focal power satisfy the following relations:
0.30≤f1/ft≤0.35
0.55≤f2/f3≤0.60
0.75≤f2/f4≤0.80
wherein f1 is the focal length value of the front fixed group (G1) whose focal power is positive; f2 is the focal length value of the variable power group (G2) with negative optical power; f3 is the focal length value of the compensation group (G3) whose focal power is positive; f4 is the focal length value of the compensation group (G4) with negative optical power; ft is the focal length value of the longest focal length of the optical lens;
the front fixed group (G1) with positive focal power comprises a positive-power double-convex lens (L11), a negative-power double-cemented lens (L12) and a positive-power meniscus lens (L13) which are coaxially arranged in sequence from the object side to the image side;
the zoom group (G2) with negative focal power comprises a negative-power meniscus lens (L21), a negative-power tri-cemented lens (L22) and a negative-power bi-concave lens (L23) which are coaxially arranged in sequence from the object side to the image side;
the compensation group (G3) with positive focal power comprises a positive focal power double-cemented lens (L31), a negative focal power double-cemented lens (L32), a positive focal power double-convex lens (L33), a negative focal power meniscus lens (L34) and a positive focal power meniscus lens (L35) which are coaxially arranged in sequence from the object side to the image side;
the compensation group (G4) with negative focal power is a negative-focal-power biconcave lens (L41);
the rear fixed group (G5) with positive optical power comprises a positive optical power meniscus lens (L51) and a positive optical power meniscus lens (L52) which are coaxially arranged in sequence from the object side to the image side;
the positive focal power double-convex lens (L11), the negative focal power double-cemented lens (L12) and the positive focal power meniscus lens (L13) of the front fixed group (G1) with positive focal power, and the positive focal power double-cemented lens (L31) and the positive focal power double-convex lens (L33) of the compensation group (G3) with positive focal power all adopt low-dispersion glass HFK 61.
2. The visible near-infrared broadband apochromatic continuous-zoom optical lens of claim 1, wherein: and the rear optical path of the rear fixed group (G5) with positive focal power is an image surface of the CCD or the CMOS.
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| CN114355590B (en) * | 2021-12-29 | 2023-07-28 | 福建福光股份有限公司 | Continuous zooming camera lens |
| CN115079379B (en) * | 2022-06-17 | 2023-07-04 | 湖南长步道光学科技有限公司 | Visible-near infrared optical system and optical lens |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014182180A (en) * | 2013-03-18 | 2014-09-29 | Canon Inc | Zoom lens, optical system, and image capturing device |
| CN104101991A (en) * | 2013-04-09 | 2014-10-15 | 佳能株式会社 | Zoom lens and image pickup device including the same |
| CN108132527A (en) * | 2018-02-07 | 2018-06-08 | 嘉兴中润光学科技有限公司 | With the low optical system according to effect of optimization |
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| JP6727953B2 (en) * | 2016-06-27 | 2020-07-22 | キヤノン株式会社 | Zoom lens and imaging device having the same |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014182180A (en) * | 2013-03-18 | 2014-09-29 | Canon Inc | Zoom lens, optical system, and image capturing device |
| CN104101991A (en) * | 2013-04-09 | 2014-10-15 | 佳能株式会社 | Zoom lens and image pickup device including the same |
| CN108132527A (en) * | 2018-02-07 | 2018-06-08 | 嘉兴中润光学科技有限公司 | With the low optical system according to effect of optimization |
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