CN113419327A - Near-infrared wide-angle lens - Google Patents
Near-infrared wide-angle lens Download PDFInfo
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- CN113419327A CN113419327A CN202110534826.6A CN202110534826A CN113419327A CN 113419327 A CN113419327 A CN 113419327A CN 202110534826 A CN202110534826 A CN 202110534826A CN 113419327 A CN113419327 A CN 113419327A
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- 238000001514 detection method Methods 0.000 claims abstract description 21
- 239000011521 glass Substances 0.000 claims abstract description 6
- 230000001681 protective effect Effects 0.000 claims abstract description 5
- 230000003287 optical effect Effects 0.000 abstract description 26
- 238000000034 method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 11
- 238000003384 imaging method Methods 0.000 description 8
- 238000012544 monitoring process Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 1
- 235000013312 flour Nutrition 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
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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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
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
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Abstract
The invention discloses a near-infrared wide-angle lens, which sequentially comprises the following components from an object side to an image side along a light propagation direction: a first lens having a negative power convex-concave lens; a second lens having a biconcave lens with negative focal power; a third lens having a double convex lens of positive refractive power; a fourth lens having a double convex lens with a positive refractive power; a fifth lens having a double convex lens of positive refractive power; a sixth lens having a biconcave lens with negative optical power; a seventh lens having a lens with positive optical power; the device comprises a near-infrared optical filter, a protective glass flat plate and a near-infrared detection image surface; the aperture stop is located between the third lens and the fourth lens, in close proximity to the fourth lens. In the wide-angle lens, the modulation transfer function value of 50 lines of cut-off frequency at each millimeter position is better than 0.4 in the range of a full field of view, and the root mean square value of the diffuse spot radius of each image point of each field of view is better than 10 micrometers; the device has the advantages of compact structure and miniaturization, and is convenient to process and detect.
Description
Technical Field
The invention relates to the field of wide-angle lenses, in particular to a near-infrared wide-angle lens.
Background
In large-area public places such as large-scale shopping malls, factory areas, office buildings and the like, the requirement for testing the temperature of a human body by utilizing near infrared is strong under the current social background, the requirements for near infrared security protection, monitoring, alarm imaging and the like in the public areas are wide, especially at night or in a dim light environment, because the near infrared light is not easy to be perceived by people, the detection and the monitoring based on the near infrared wave band can improve the safety and the timeliness.
The near-infrared lens is one of key components of a near-infrared detection technology, and the high-performance near-infrared lens can improve the detection accuracy. Most of the existing near-infrared lenses are difficult to be compatible with high-performance optical characteristics and miniaturized physical structure characteristics of near-infrared broadband, large field of view and large relative aperture.
Patent CN211293432U discloses a large-aperture large-field near-infrared lens, which covers a narrow near-infrared band range and a small field angle, although the relative aperture is large.
Patent CN112230406A discloses a near-infrared high-definition zoom optical system with strong fog penetration capability, which realizes target detection in different field areas by zooming, but the system covers a narrow near-infrared band range, a small field angle, and a small relative aperture.
Disclosure of Invention
The purpose of the invention is as follows: in view of the above problems, the present invention aims to provide a wide-spectrum, large relative aperture near-infrared wide-angle lens.
The technical scheme is as follows: the invention discloses a near-infrared wide-angle lens, which sequentially comprises the following components from an object side to an image side along a light propagation direction:
a first lens having a negative power convex-concave lens; a second lens having a biconcave lens with negative focal power; a third lens having a double convex lens of positive refractive power; a fourth lens having a double convex lens with a positive refractive power; a fifth lens having a double convex lens of positive refractive power; a sixth lens having a biconcave lens with negative optical power; a seventh lens having a lens with positive optical power; the device comprises a near-infrared optical filter, a protective glass flat plate and a near-infrared detection image surface; the aperture stop is located between the third lens and the fourth lens and is in close proximity to the fourth lens.
Further, the fifth lens and the sixth lens are cemented lenses.
Furthermore, seven lens surfaces of the first lens to the seventh lens are all spherical surfaces, and the interval between the adjacent lenses is air.
Furthermore, the working waveband range of the near-infrared wide-angle lens system is 900-1700 nm, the near-infrared bandwidth is 800nm, and the central wavelength is 1300 nm.
Further, the F number range of the near-infrared wide-angle lens system is 2.8-3.2, the effective focal length range is 5.6-6.4 mm, the full field angle is not less than 130 degrees, and the diagonal size range of the near-infrared detection image surface is 11.7-12.3 mm.
Further, the axial distance range from the front surface of the first lens to the near-infrared detection image surface is 50-55 mm.
Further, the caliber of the first lens is the maximum caliber of the system and is not more than 30 mm.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages:
1. in the wide-angle lens, the modulation transfer function value of 50 lines of cut-off frequency at each millimeter position is better than 0.4 in the range of a full field of view, and the root mean square value of the diffuse spot radius of each image point of each field of view is better than 10 micrometers;
2. the wide-angle lens comprises seven spherical lenses and provides a wide-angle lens with near infrared, wide spectrum and large relative aperture;
3. the device has the advantages of compact structure and miniaturization, and is convenient to process and detect.
Drawings
FIG. 1 is a schematic diagram of an optical path according to an embodiment;
FIG. 2 is a dot diagram of an embodiment;
FIG. 3 is a graph of a modulation transfer function according to one embodiment;
FIG. 4 is a schematic diagram of the optical path of the second embodiment;
FIG. 5 is a two-point diagram of the embodiment;
FIG. 6 is a graph of the modulation transfer function of the second embodiment;
FIG. 7 is a schematic diagram of three optical paths of the embodiment;
FIG. 8 is a three-point arrangement of the embodiment;
FIG. 9 is a graph of the modulation transfer function of an embodiment;
FIG. 10 is a diagram illustrating four optical paths according to an embodiment;
FIG. 11 is a four-point column diagram of an embodiment;
fig. 12 is a graph of the transfer function of the four modulations of the example.
Detailed Description
Example 1
In this embodiment, as shown in the optical path diagram of fig. 1, the near-infrared wide-angle lens includes, in order from an object side to an image side along a propagation direction of light:
a first lens 1 having a negative power convex-concave lens; a second lens 2 having a biconcave lens with negative refractive power; a third lens 3 which is a double-convex lens having a positive refractive power; a fourth lens 4 which is a double-convex lens having a positive refractive power; a fifth lens 5 which is a double-convex lens having a positive refractive power; a sixth lens 6 which is a biconcave lens having negative refractive power; a seventh lens 7 having a lens of positive refractive power; the device comprises a near-infrared filter 9, a protective glass flat sheet 10 and a near-infrared detection image surface 11; the aperture stop 8 is located between the third lens 3 and the fourth lens 4 and is in close proximity to the fourth lens 4. The near-infrared wide-angle lens system of the embodiment forms a structural form with the focal power being negative, positive, negative and positive.
Table 1 shows optical parameters of the wide-angle lens of the present embodiment, in which the radius of curvature and the thickness are both in units of millimeters.
TABLE 1
| Flour mark | Radius of curvature | Thickness of | Refractive index | Coefficient of dispersion |
| Article surface | Infinity(s) | Infinity(s) | ||
| Front surface of the first lens | 28.085 | 3 | 1.91 | 35.3 |
| Rear surface of the first lens | 8.571 | 6.292 | ||
| Front surface of the second lens | -14.386 | 1.8 | 1.43 | 94.8 |
| Rear surface of the second lens | 10.535 | 3.791 | ||
| Front surface of the third lens | 23.621 | 1.8 | 1.90 | 31.4 |
| Rear surface of the third lens | -34.384 | 11.123 | ||
| Aperture diaphragm | Infinity(s) | 0.1 | ||
| Front surface of the fourth lens | 15.335 | 3 | 1.70 | 55.5 |
| Rear surface of the fourth lens | -18.452 | 0.1 | ||
| Front surface of fifth lens | 22.130 | 1.5 | 1.59 | 68.5 |
| Rear surface of fifth lens | -6.565 | 0 | ||
| Front surface of sixth lens | -6.565 | 3.226 | 1.76 | 26.6 |
| Rear surface of sixth lens | 10.246 | 1.667 | ||
| Front surface of seventh lens | 13.002 | 3.5 | 1.57 | 71.3 |
| Rear surface of seventh lens | -21.914 | 1.553 | ||
| Near infrared filter front surface | Infinity(s) | 0.5 | 1.52 | 64.2 |
| Near infrared filter back surface | Infinity(s) | 5.999 | ||
| Front surface of flat sheet of protective glass | Infinity(s) | 0.5 | 1.52 | 64.2 |
| Protecting the rear surface of a glass flat sheet | Infinity(s) | 0.55 | ||
| Near-infrared detection image surface | Infinity(s) |
The fifth lens 5 and the sixth lens 6 are cemented lenses. Seven lens surfaces of the first lens 1 to the seventh lens 7 are all spherical surfaces, and the interval between the adjacent lenses is air. In the embodiment, the near-infrared working wave band range is 900nm to 1700nm, the near-infrared bandwidth is 800nm, and the central wavelength is 1300 nm. The F-number of the system is 3.0, the effective focal length is 6mm, and the full field angle is 130 °. The axial distance from the front surface of the first lens 1 to the near-infrared detection image plane 11 is 50 mm. The aperture of the first lens 1 is 24mm, which is the maximum aperture of the lens system of this embodiment.
In the near-infrared wide-angle lens and the imaging system in the embodiment, in the full-field range, the root mean square value of the diffuse speckle radius of each field is better than 10 micrometers, the image point mass centers are concentrated, and the detection precision is high, as shown in fig. 2; the modulation transfer function values at the cut-off frequency of 50 lines per millimeter are all better than 0.4, and the imaging performance is good, as shown in fig. 3.
Example 2
The present embodiment is the same as the optical system of embodiment 1 in terms of lens arrangement order and type, and the optical parameters of each lens in the present embodiment are different from those of embodiment 1, specifically, the optical parameters of the wide-angle lens of the present embodiment shown in table 2, where the units of curvature radius and thickness are millimeters.
TABLE 2
The optical path diagram of the near-infrared wide-angle lens in this embodiment is shown in fig. 4, the operating band range is 900nm to 1700nm, the near-infrared bandwidth is 800nm, and the central wavelength is 1300 nm. The F-number of the system is 3.01, the effective focal length is 6mm, and the full field angle is 130 °. The axial distance from the front surface of the first lens 1 to the near-infrared detection image plane 11 is 50 mm. The aperture of the first lens 1 is 27mm, which is the maximum aperture of the system.
In a full-field-of-view range, the root mean square value of the scattered spot radius of each field of view of the near-infrared wide-angle lens and the imaging system is better than 10 microns, the image points have concentrated mass centers, and the detection precision is high, as shown in FIG. 5; the modulation transfer function values at the cut-off frequency of 50 lines per millimeter are all better than 0.4, and the imaging performance is good, as shown in fig. 6.
Example 3
The present embodiment is the same as the optical system of embodiment 1 in terms of the order and type of lens arrangement, and the optical parameters of each lens in the present embodiment are different from those of embodiment 1, specifically, the optical parameters of the wide-angle lens of the present embodiment shown in table 3, where the unit of curvature radius and thickness are millimeters.
TABLE 3
The optical path diagram of the near-infrared wide-angle lens in this embodiment is shown in fig. 7, where the operating band range is 900nm to 1700nm, the near-infrared bandwidth is 800nm, and the central wavelength is 1300 nm. The F-number of the system is 3.01, the effective focal length is 6.2mm, and the full field angle is 130 °. The axial distance from the front surface of the first lens 1 to the near-infrared detection image plane 11 is 52 mm. The aperture of the first lens 1 is 27mm, which is the maximum aperture of the lens system.
In a full-field-of-view range, the root mean square value of the scattered spot radius of each field of view of the near-infrared wide-angle lens and the imaging system is better than 10 microns, the image points have concentrated mass centers, and the detection precision is high, as shown in fig. 8; the modulation transfer function values at the cut-off frequency of 50 lines per millimeter are all better than 0.4, and the imaging performance is good, as shown in fig. 9.
Example 4
The present embodiment is the same as the optical system of embodiment 1 in terms of the order and type of lens arrangement, and the optical parameters of each lens in the present embodiment are different from those of embodiment 1, specifically, the optical parameters of the wide-angle lens of the present embodiment shown in table 4, where the unit of curvature radius and thickness are millimeters.
TABLE 4
The optical path diagram of the near-infrared wide-angle lens in this embodiment is shown in fig. 10, where the operating band range is 900nm to 1700nm, the near-infrared bandwidth is 800nm, and the central wavelength is 1300 nm. The F-number of the system is 3.0, the effective focal length is 6.2mm, and the full field angle is 130 °. The axial distance from the front surface of the first lens 1 to the near-infrared detection image plane 11 is 52 mm. The aperture of the first lens 1 is 27mm, which is the maximum aperture of the system.
In a full-field-of-view range, the root mean square value of the diffuse speckle radius of each image point of each field of view is superior to 10 micrometers, the image point mass centers are concentrated, and the detection precision is high, as shown in fig. 11; the modulation transfer function values at the cut-off frequency of 50 lines per mm are all better than 0.4, and the imaging performance is good, as shown in fig. 12.
Claims (7)
1. A near-infrared wide-angle lens, comprising, in order from an object side to an image side along a light propagation direction:
a first lens (1) having a negative power convex-concave lens;
a second lens (2) having a negative-focal-power biconcave lens;
a third lens (3) which is a double-convex lens having a positive refractive power;
a fourth lens (4) which is a double-convex lens having a positive refractive power;
a fifth lens (5) which is a double-convex lens having a positive refractive power;
a sixth lens (6) having a negative-focal-power biconcave lens;
a seventh lens (7) having a positive refractive power;
the device comprises a near-infrared filter (9), a protective glass flat sheet (10) and a near-infrared detection image surface (11);
the aperture diaphragm (8) is located between the third lens (3) and the fourth lens (4) and is in close proximity to the fourth lens (4).
2. The near-infrared wide-angle lens according to claim 1, wherein the fifth lens (5) and the sixth lens (6) are cemented lenses.
3. The near-infrared wide-angle lens according to claim 2, wherein seven lens surfaces of the first lens (1) to the seventh lens (7) are spherical surfaces, and adjacent lenses are spaced by air.
4. The near-infrared wide-angle lens of claim 2, wherein the near-infrared wide-angle lens system has an operating band range of 900-1700 nm, a near-infrared bandwidth of 800nm, and a center wavelength of 1300 nm.
5. The near-infrared wide-angle lens according to claim 2, wherein the F number of the near-infrared wide-angle lens system is in a range of 2.8 to 3.2, the effective focal length is in a range of 5.6 to 6.4mm, the full field angle is not less than 130 °, and the diagonal dimension of the near-infrared detection image plane (11) is in a range of 11.7 to 12.3 mm.
6. The near-infrared wide-angle lens according to claim 2, wherein an axial distance from the front surface of the first lens (1) to the near-infrared detection image plane (11) ranges from 50 to 55 mm.
7. The near-infrared wide-angle lens according to claim 2, wherein the aperture of the first lens (1) is the maximum aperture of the system and does not exceed 30 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110534826.6A CN113419327A (en) | 2021-05-17 | 2021-05-17 | Near-infrared wide-angle lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110534826.6A CN113419327A (en) | 2021-05-17 | 2021-05-17 | Near-infrared wide-angle lens |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106125258A (en) * | 2016-09-07 | 2016-11-16 | 江西联益光学有限公司 | Wide-angle lens |
| US20170242220A1 (en) * | 2016-02-19 | 2017-08-24 | Samsung Electronics Co., Ltd. | Optical lens assembly and electronic apparatus including the same |
| CN107505693A (en) * | 2017-10-10 | 2017-12-22 | 上海小蚁科技有限公司 | A kind of fish eye lens |
| CN107924044A (en) * | 2015-09-04 | 2018-04-17 | 三星电子株式会社 | Ultra-wide angle optical system |
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| CN109814229A (en) * | 2017-11-21 | 2019-05-28 | 三星电机株式会社 | Optical imaging system |
| CN110133828A (en) * | 2019-04-28 | 2019-08-16 | 江西联创电子有限公司 | Tight shot |
| CN209640588U (en) * | 2019-05-08 | 2019-11-15 | 中山联合光电科技股份有限公司 | A kind of infrared confocal wide-angle lens device |
| CN111566536A (en) * | 2017-12-29 | 2020-08-21 | 三星电子株式会社 | Optical lens assembly and electronic device including the same |
-
2021
- 2021-05-17 CN CN202110534826.6A patent/CN113419327A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107924044A (en) * | 2015-09-04 | 2018-04-17 | 三星电子株式会社 | Ultra-wide angle optical system |
| US20170242220A1 (en) * | 2016-02-19 | 2017-08-24 | Samsung Electronics Co., Ltd. | Optical lens assembly and electronic apparatus including the same |
| CN106125258A (en) * | 2016-09-07 | 2016-11-16 | 江西联益光学有限公司 | Wide-angle lens |
| CN108614344A (en) * | 2016-12-12 | 2018-10-02 | 广西师范大学 | A kind of vehicle mounted wide-angle mirror head |
| CN107505693A (en) * | 2017-10-10 | 2017-12-22 | 上海小蚁科技有限公司 | A kind of fish eye lens |
| CN109814229A (en) * | 2017-11-21 | 2019-05-28 | 三星电机株式会社 | Optical imaging system |
| CN111566536A (en) * | 2017-12-29 | 2020-08-21 | 三星电子株式会社 | Optical lens assembly and electronic device including the same |
| CN110133828A (en) * | 2019-04-28 | 2019-08-16 | 江西联创电子有限公司 | Tight shot |
| CN209640588U (en) * | 2019-05-08 | 2019-11-15 | 中山联合光电科技股份有限公司 | A kind of infrared confocal wide-angle lens device |
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Application publication date: 20210921 |