CN111856705B - A large aperture high and low temperature confocal optical device - Google Patents
A large aperture high and low temperature confocal optical device Download PDFInfo
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- CN111856705B CN111856705B CN201910361700.6A CN201910361700A CN111856705B CN 111856705 B CN111856705 B CN 111856705B CN 201910361700 A CN201910361700 A CN 201910361700A CN 111856705 B CN111856705 B CN 111856705B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 26
- 239000000463 material Substances 0.000 claims description 20
- 210000001747 pupil Anatomy 0.000 claims description 3
- 230000005499 meniscus Effects 0.000 claims description 2
- 238000003384 imaging method Methods 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract 1
- 230000035945 sensitivity Effects 0.000 abstract 1
- 230000004075 alteration Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 239000002184 metal Substances 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 230000000875 corresponding effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 201000009310 astigmatism Diseases 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 206010010071 Coma Diseases 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000000887 face Anatomy 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
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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
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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Abstract
The invention discloses a large aperture high-low temperature confocal optical device, which sequentially comprises the following components from the object side: a first lens having positive optical power; a second lens having negative optical power; a third lens having positive optical power; a first cemented lens formed by a fourth lens with positive focal power cemented with a fifth lens with negative focal power; a second cemented lens formed by a sixth lens of negative optical power cemented with a seventh lens of positive optical power; a third cemented lens formed by a positive eighth lens cemented with a negative ninth lens; the lens adopts a 9G structure. The lens is compact in structure by reasonably distributing the focal power, so that tolerance sensitivity is greatly reduced, and imaging quality is greatly improved; a large aperture of F0.95 is realized in the aspect of aperture; and simultaneously, the focal length ratio is reasonably controlled so that the device is not defocused under the environmental condition of minus 40 ℃ to +85 ℃.
Description
Technical Field
The invention is mainly aimed at security monitoring and ensuring a large aperture optical device which is not defocused at-40-85 ℃.
Background
At present, the domestic closed circuit monitoring industry (CCTV) is developed towards the directions of miniaturization, multifunction and strong environment adaptability, and under the form of very strong domestic competition, the fixed focus lens cannot meet the demands of clients in different regions, for example, the northeast market of China requires a designed monitoring device which is arranged outdoors and is not defocused all the year round, the northeast of China is always at 30 ℃ below zero in winter, and the highest temperature in summer reaches about 31 ℃. If the circuit heating factor of the monitoring camera is considered, it becomes necessary to design an optical imaging device with a large aperture and without shifting the focal plane within-40 to 85 ℃. Data statistics according to authority statistics of public security authorities: nearly 70% of crimes occur at night or in areas with darker light, and the dark is a natural protective umbrella for criminals, and in view of the color deficiency, unclear details and insufficient brightness of the existing camera under infrared light supplement, it is not difficult to find that the imaging quality of the current front-end camera under weak light is already a short plate for security and protection big data development, so that it is necessary to push out a big aperture camera capable of realizing bright, clean and colorful pictures under low illumination.
Disclosure of Invention
The invention mainly provides a large aperture optical device which is monitored at the temperature of-40 ℃ to 85 ℃ in a security mode and is not out of focus.
In order to meet the design requirements, the technical scheme provided by the invention is as follows:
a large aperture high-low temperature confocal optical device includes, in order from the object side:
The lens comprises a first lens (L1) with positive focal power, wherein the first lens (L1) is a meniscus-shaped convex lens, the convex surface faces to the object side, and the concave surface faces to the image side;
A second lens (L2) having negative optical power, the second lens (L2) being a biconcave lens;
A third lens (L3) having positive optical power, the third lens (L3) being a biconvex lens;
A fourth lens (L4), a fifth lens (L5), wherein the fourth lens (L4) is a convex lens, the fifth lens (L5) is a concave lens, the fourth lens (L4) and the fifth lens (L5) are glued to form a first glued lens (J1) with positive optical power, the concave surface of the first glued lens (J1) faces the object side, and the convex surface faces the image side;
A sixth lens (L6), a seventh lens (L7), wherein the sixth lens (L6) is a concave lens, the seventh lens (L7) is a convex lens, the sixth lens (L6) and the seventh lens (L7) are glued to form a second glued lens (J2) with positive optical power, and the second glued lens (J2) is a biconvex lens;
an eighth lens (L8), a ninth lens (L9), wherein the eighth lens (L8) is a convex lens, the ninth lens (L9) is a concave lens, the eighth lens (L8) and the ninth lens (L9) are glued to form a third glued lens (J3) with positive optical power, the convex surface of the third glued lens (J3) faces the object side, and the concave surface faces the image side;
Optionally, the first lens (L1) satisfies the following condition: 1.96 Nd.gtoreq.1.8, and Vd.gtoreq.35, where Nd represents the d-ray refractive index of the first lens (L1) material, and Vd represents the Abbe number of the d-ray of the first lens (L1) material.
Optionally said second lens (L2) fulfils the following conditions: 1.75 Nd.gtoreq.1.6, and 40.gtoreq.Vd.gtoreq.30, where Nd represents the d-ray refractive index of the second lens (L2) material, and Vd represents the Abbe number of the d-ray of the second lens (L2) material.
Optionally said third lens (L3) fulfils the following conditions: 2.0 Nd.gtoreq.1.8, and 42.gtoreq.Vd.gtoreq.32, where Nd represents the d-ray refractive index of the third lens (L3) material, and Vd represents the Abbe number of the d-ray of the third lens (L3) material.
Optionally, the fourth lens (L4) focal length f4 and the fifth lens (L5) focal length f5 satisfy: -1.2 is more than or equal to f4/f5 is more than or equal to-0.4.
Optionally, the focal length f6 of the sixth lens (L6) and the focal length f7 of the seventh lens (L7) satisfy: -1.0 is more than or equal to f7/f6 is more than or equal to-0.2.
Optionally, the focal length f8 of the eighth lens (L8) and the focal length f9 of the ninth lens (L9) satisfy: -1.2 is more than or equal to f8/f9 is more than or equal to-0.4.
Optionally, the first lens (L1) focal length f1, the second lens (L2) focal length f2, the third lens (L3) focal length f3, the fourth lens (L4) focal length f4, the fifth lens (L5) focal length f5, the sixth lens (L6) focal length f6, the seventh lens (L7) focal length f7, the eighth lens (L8) focal length f8, and the ninth lens (L9) focal length f9 satisfy the following conditions:
optionally, it also satisfies: the value of FNO is in the following range:
where f is the focal length of the system and D is the entrance pupil diameter.
Compared with the prior art, the invention has the following advantages:
1. The invention can correct spherical aberration, coma aberration, astigmatism, field curvature and distortion in a temperature range of-40 ℃ to 85 ℃ through the configuration of the first lens to the ninth lens, and can correct and compensate air interval change caused by temperature change of a metal space ring in the lens, thereby realizing back focus zero displacement, keeping stable image quality in a larger temperature range (-40 ℃ to 85 ℃), keeping clear imaging of the lens in a temperature range of-40 ℃ to 85 ℃ and stabilizing the image quality.
2. The large aperture high-low temperature confocal optical device is of an all-glass all-metal structure, and is high in reliability and long in service life.
3. The invention is a large aperture device, can clearly image under the condition of insufficient light, and avoids unclear imaging caused by insufficient external light entering quantity at night or in a dark place.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention (the object side is on the left side of the system);
FIG. 2 is a graph of MTF (modulation transfer function) at 20deg.C for the present invention;
FIG. 3 is a graph of defocus at 20℃for the present invention;
FIG. 4 is a graph of defocus at-40℃for the present invention;
FIG. 5 is a graph of defocus at 85℃for the present invention;
FIG. 6 is a graph of field curvature of the present invention;
fig. 7 is a graph of the distortion curve of the present invention.
Detailed Description
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the matters related to the present invention are shown in the accompanying drawings.
Referring to fig. 1, the apparatus includes, in order from an object side: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9;
the first lens (L1) is a meniscus type convex lens with positive focal power, the convex surface faces the object side, and the concave surface faces the image side, so that spherical aberration and astigmatism can be corrected.
The second lens (L2) is a biconcave lens with negative focal power, and can correct phase difference and improve resolution.
The third lens (L3) is a biconvex lens with positive focal power, and can correct phase difference and improve resolution.
The fourth lens (L4) is a convex lens, the fifth lens (L5) is a concave lens, the fourth lens (L4) and the fifth lens (L5) are glued to form a first glued lens (J1) with positive focal power, the concave surface of the first glued lens (J1) faces towards the object space, the convex surface of the first glued lens faces towards the image space, and the chromatic aberration of the system can be corrected.
The sixth lens (L6) is a concave lens, the seventh lens (L7) is a convex lens, the sixth lens (L6) and the seventh lens (L7) are glued to form a second glued lens (J2) with positive focal power, the second glued lens (J2) is a biconvex lens, the chromatic aberration of the system can be corrected, the seventh lens is a material positively correlated with the refractive index and the temperature, and the air interval change caused by the temperature change of a metal space ring in the compensating device can be corrected, so that the back focus zero displacement is realized, and the stability of the image quality is maintained in a larger temperature range (-40 ℃ to 85 ℃).
The eighth lens (L8) is a convex lens, the ninth lens (L9) is a concave lens, the eighth lens (L8) and the ninth lens (L9) are glued to form a third glued lens (J3) with positive focal power, the convex surface of the third glued lens (J3) faces to the object space, the concave surface faces to the image space, the chromatic aberration of the system can be corrected, the eighth lens is a material positively correlated with the refractive index and the temperature, and the change of air interval caused by the temperature change of a metal space ring in the compensation device can be corrected, so that the back focal zero displacement is realized, and the stability of the image quality is maintained in a larger temperature range (-40 ℃ -85 ℃).
As a preferable mode of the present embodiment:
The first lens (L1) satisfies the following condition: 1.96 Nd.gtoreq.1.8, and Vd.gtoreq.35, where Nd represents the d-ray refractive index of the first lens (L1) material, and Vd represents the Abbe number of the d-ray of the first lens (L1) material.
The second lens (L2) satisfies the following condition: 1.75 Nd.gtoreq.1.6, and 40.gtoreq.Vd.gtoreq.30, where Nd represents the d-ray refractive index of the second lens (L2) material, and Vd represents the Abbe number of the d-ray of the second lens (L2) material.
The third lens (L3) satisfies the following condition: 2.0 Nd.gtoreq.1.8, and 42.gtoreq.Vd.gtoreq.32, where Nd represents the d-ray refractive index of the third lens (L3) material, and Vd represents the Abbe number of the d-ray of the third lens (L3) material.
The focal length f4 of the fourth lens (L4) and the focal length f5 of the fifth lens (L5) satisfy the following conditions: -1.2 is more than or equal to f4/f5 is more than or equal to-0.4.
The focal length f6 of the sixth lens (L6) and the focal length f7 of the seventh lens (L7) satisfy the following conditions: -1.0 is more than or equal to f7/f6 is more than or equal to-0.2.
The focal length f8 of the eighth lens (L8) and the focal length f9 of the ninth lens (L9) satisfy the following conditions: -1.2 is more than or equal to f8/f9 is more than or equal to-0.4.
The first lens (L1) focal length f1, the second lens (L2) focal length f2, the third lens (L3) focal length f3, the fourth lens (L4) focal length f4, the fifth lens (L5) focal length f5, the sixth lens (L6) focal length f6, the seventh lens (L7) focal length f7, the eighth lens (L8) focal length f8 and the ninth lens (L9) focal length f9 satisfy the following conditions:
the large aperture high-low temperature confocal optical device is characterized by further comprising the following components: the value of FNO is in the following range:
where f is the focal length of the system and D is the entrance pupil diameter.
Fig. 2 to 7 are graphs of optical performance corresponding to the examples. FIG. 2 is a graph of MTF (modulation transfer function) at 20℃for the present invention. The MTF is a function of the ratio of the modulation degree between the actual image and the ideal image with respect to the spatial frequency at a certain spatial frequency. The MTF curve is plotted on the abscissa as spatial frequency lp/mm (per milli-meter line pair) and on the ordinate as contrast (%). The higher the curve, the better the imaging quality. Different curves represent different image heights, T and S represent MTF in meridian and sagittal directions respectively, as shown in figure 2, the resolution reaches 90lp/mm & gt45% in the full view field, and the requirement of high pixels of the lens is completely met; FIG. 3 is a defocusing curve at 20 ℃ showing the relationship between meridian and sagittal MTF and defocusing amount for different fields of view with different set spatial frequencies, wherein the abscissa in the figure is defocusing amount and the ordinate is contrast, and whether the best focal plane of each field of view is consistent or not and whether the MTF is sensitive to defocusing or not can be seen through the figure. As can be seen from fig. 3, the best focal plane of each field of view is basically consistent, and the image quality of each field of view is uniform and clear; FIG. 4 is a graph of defocus at-40℃according to the present invention, and it is clear from FIG. 4 that defocus is not significantly observed at-40℃compared with defocus at 20℃and the image quality is clear; FIG. 5 is a defocus plot of the present invention at-85℃and as can be seen from FIG. 4, there is no significant defocus and the image quality is clear at high temperatures of 85℃compared to the defocus plot at 20 ℃; fig. 6 is a graph of field curves of the present invention, expressed by wavelengths of commonly used F, d, C (f=0.486 um,d＝0.588um,C＝0.656u m) trichromatic light, T and S representing meridian and arc amounts, respectively, with the ordinate representing field of view in degrees and the abscissa representing field curve in millimeters (mm); fig. 7 is a graph of distortion for the present invention, with field of view on the ordinate and percent distortion on the abscissa. The distortion curve graph shows the distortion magnitude values under different view fields, the unit is that the optical distortion of the system is | TVdistortion | which is less than or equal to 5% and belongs to small distortion, and the design requirement of the monitoring system on the distortion is met. Therefore, as can be seen from FIGS. 2-7, the system has corrected various aberrations to a good level.
In this embodiment, the optical system preferred parameters are as follows:
| Effective focal length | 1 1.53 |
| F/# (light hoard) | 1 |
| Optical back focus | 6.01 |
| Angle of view | 48 |
The values of the corresponding elements are as follows:
In the above table, the radius of curvature refers to the radius of curvature of each surface, and the pitch refers to the distance between two adjacent surfaces, for example, the pitch of surface 1, i.e., the distance between surface 1 and surface 2. The refractive index and abbe number are those of the corresponding element, for example, the refractive index of the second lens L2 is 1.66, the abbe number is 36; the refractive index of the third lens L3 is 1.9 and the abbe number is 37.
The foregoing is only illustrative of the present invention and is not to be construed as limiting thereof, but rather as various modifications, equivalent arrangements, improvements, etc., within the spirit and principles of the present invention.
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| CN210294654U (en) * | 2019-04-30 | 2020-04-10 | 江西凤凰光学科技有限公司 | Large-aperture high-low temperature confocal optical device |
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| JP5280831B2 (en) * | 2008-12-24 | 2013-09-04 | 株式会社トプコン | Temperature compensated projection lens |
| CN103558677B (en) * | 2013-11-11 | 2015-11-18 | 舜宇光学(中山)有限公司 | A kind of without thermalization monitoring camera |
| CN107861229B (en) * | 2017-12-12 | 2023-10-10 | 厦门爱劳德光电有限公司 | High definition wide angle unmanned aerial vehicle camera lens |
| CN109375353A (en) * | 2018-11-15 | 2019-02-22 | 江西特莱斯光学有限公司 | Day and night confocal lens with ultra-large aperture |
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| CN210294654U (en) * | 2019-04-30 | 2020-04-10 | 江西凤凰光学科技有限公司 | Large-aperture high-low temperature confocal optical device |
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