CN210294654U - Large-aperture high-low temperature confocal optical device - Google Patents
Large-aperture high-low temperature confocal optical device Download PDFInfo
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- CN210294654U CN210294654U CN201920615756.5U CN201920615756U CN210294654U CN 210294654 U CN210294654 U CN 210294654U CN 201920615756 U CN201920615756 U CN 201920615756U CN 210294654 U CN210294654 U CN 210294654U
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Abstract
The utility model discloses a confocal optical device of big light ring height low temperature begins order including from the thing side: a first lens having a positive optical power; a second lens having a negative optical power; a third lens having a positive optical power; the first cemented lens is formed by the fourth lens with positive focal power and the fifth lens with negative focal power through the gluing; the second cemented lens is formed by the sixth lens with negative focal power and the seventh lens with positive focal power through the gluing; the third cemented lens is formed by the eighth lens with positive focal power and the ninth lens with negative focal power through the cementing process; the lens adopts a 9G structure. The lens structure is compact by reasonably distributing focal power, so that tolerance sensitivity is greatly reduced, and imaging quality is greatly improved; a large aperture of F0.95 is achieved in terms of aperture; meanwhile, the focal length ratio is reasonably controlled, so that the device is not defocused under the environmental condition of minus 40 ℃ to plus 85 ℃.
Description
Technical Field
The utility model discloses mainly to the security protection control and guarantee at-40 ℃ -85 ℃ big light ring optical device that not defocus.
Background
At present, the domestic closed circuit monitoring industry (CCTV) is developed towards miniaturization, multifunction and strong environment adaptability, and under the form of extremely intense domestic competition, the fixed focus lens cannot meet the requirements of customers in different regions, for example, the northeast market of China requires a designed monitoring device which is placed outdoors and is not defocused all the year round, the temperature of the northeast of China is often minus 30 ℃ in winter, and the highest temperature of the northeast of China can reach about 31 ℃ in summer. Considering the circuit heating factor of the monitoring camera, it becomes necessary to design an optical imaging device with a large aperture and a non-offset focal plane within-40 deg.C to 85 deg.C. Performing data statistics according to authority statistics of public security organs: nearly 70% of crimes occur at night or in dark regions, and darkness becomes a natural protective umbrella for criminals, and in view of color loss, unclear details and insufficient brightness under the infrared light supplement of the existing camera, the imaging quality of the current front-end camera under the weak light is difficult to find out to become a short plate for security and protection big data development, so that a large-aperture camera capable of realizing bright, clean and colorful pictures under low illumination is very necessary.
SUMMERY OF THE UTILITY MODEL
The utility model mainly provides a security protection monitoring large aperture optical device which is not out of focus at-40 ℃ -85 ℃.
In order to meet the design requirements, the utility model provides a technical scheme as follows:
a large-aperture high-low temperature confocal optical device comprises the following components in sequence from an object side:
a first lens (L1) with positive power, wherein the first lens (L1) is a meniscus convex lens with a convex surface facing the object side and a concave surface facing the image side;
a second lens (L2) having a negative optical power, said second lens (L2) being a biconcave lens;
a third lens (L3) having a positive optical power, said 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 cemented lens (J1) with positive power, the concave surface of the first cemented lens (J1) faces the object side, and the convex surface of the first cemented lens faces the image side;
a sixth lens (L6), a seventh lens (L7), said sixth lens (L6) being a concave lens, said seventh lens (L7) being a convex lens, said sixth lens (L6) being a second cemented lens (J2) of positive power cemented with said seventh lens (L7), said second cemented lens (J2) being 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) is a third cemented lens (J3) of positive power cemented with the ninth lens (L9), the convex surface of the third cemented 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 is more than or equal to Nd and more than or equal to 1.8, 45 is more than or equal to Vd and more than or equal to 35, wherein Nd represents the d-light refractive index of the material of the first lens (L1), and Vd represents the Abbe number of the d-light of the material of the first lens (L1).
Optionally, the second lens (L2) satisfies the following condition: 1.75 is more than or equal to Nd and more than or equal to 1.6, and 40 is more than or equal to Vd and more than or equal to 30, wherein Nd represents the d-light refractive index of the material of the second lens (L2), and Vd represents the Abbe number of the d-light of the material of the second lens (L2).
Optionally, the third lens (L3) satisfies the following condition: 2.0 & gt, Nd & gt, 1.8, 42 & gt, Vd & gt, 32, wherein Nd represents the d-light refractive index of the material of the third lens (L3), and Vd represents the Abbe number of d-light of the material of the third lens (L3).
Optionally said fourth lens (L4) focal length f4And the focal length f of the fifth lens (L5)5Satisfies the following conditions: -1.2. gtoreq.f4/f5≥-0.4。
Optionally, said sixth lens (L6) focal length f6And the focal length f of the seventh lens (L7)7Satisfies the following conditions: -1.0. gtoreq.f7/f6≥-0.2。
Optionally, said eighth lens (L8) focal length f8And the focal length f of the ninth lens (L9)9Satisfies the following conditions: -1.2. gtoreq.f8/f9≥-0.4。
Optionally, the first lens (L1) has a focal length f1Second lens (L2) focal length f2Third lens (L3) focal length f3Fourth lens (L4) focal length f4Focal length f of fifth lens (L5)5Focal length f of sixth lens (L6)6Seventh lens (L7) focal length f7Focal length f of eighth lens (L8)8Focal length f of ninth lens (L9)9The following conditions are satisfied:
optionally, it is also satisfied that the value of FNO is in the following range
Where f is the system focal length and D is the entrance pupil diameter.
Compared with the prior art, the utility model discloses there is following advantage:
1. the utility model discloses a configuration of first lens to ninth lens can be at-40 deg.C 85 deg.C temperature range correction spherical aberration, coma, astigmatism, field curvature and distortion to can rectify and compensate the air space change that the metal space ring arouses because of temperature variation in the camera lens, thereby realize back burnt zero displacement, keep the stability of image quality in great temperature range (-40 deg.C 85 deg.C), make the camera lens keep clear formation of image in-40 deg.C 85 deg.C temperature range, and the image quality is stable.
2. The utility model discloses confocal optical device of big light ring height low temperature is full glass all-metal structure, and the reliability is high, long service life.
3. The utility model discloses a big light ring device can be under the insufficient condition of light clear formation of image, avoids at night or dim department, because external light inlet quantity is not enough to lead to forming of image not clear.
Drawings
Fig. 1 is a schematic structural diagram of the present invention (the object side is located at the left side of the system);
FIG. 2 is a graph of MTF (modulation transfer function) at 20 deg.C according to the present invention;
FIG. 3 is a graph showing the defocusing curve at 20 deg.C;
FIG. 4 is a defocus plot at-40 deg.C;
FIG. 5 is a defocus graph at 85 deg.C;
fig. 6 is a field curvature graph of the present invention;
fig. 7 is a graph of the distortion curve of the present invention.
Detailed Description
The technical solution of the present invention is further explained by the following 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 of the invention. It should be further noted that, for the convenience of description, only some but not all of the relevant portions of the present invention are shown in the 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 convex lens with positive power, the convex surface faces the object side, the concave surface faces the image side, and 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 cemented to form a first cemented lens (J1) with positive focal power, the concave surface of the first cemented lens (J1) faces the object side, the convex surface faces the image side, 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 cemented lens (J2) with positive focal power, the second cemented lens (J2) is a double-convex lens and can correct system chromatic aberration, the seventh lens is made of a material with positive correlation between refractive index and temperature and can correct air interval change of a metal spacer ring in a compensation device due to temperature change, so that zero displacement of back focus is realized, and image quality is kept stable in a large temperature range (-40 ℃ -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 cemented lens (J3) with positive focal power, the convex surface of the third cemented lens (J3) faces to the object side, the concave surface of the third cemented lens faces to the image side, and the chromatic aberration of the system can be corrected, and the eighth lens is made of a material with positive correlation between the refractive index and the temperature, so that the air interval change of a metal spacer ring in a compensation device caused by the temperature change can be corrected, the zero displacement of a back focus is realized, and the stability of the image quality is kept 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 is more than or equal to Nd and more than or equal to 1.8, 45 is more than or equal to Vd and more than or equal to 35, wherein Nd represents the d-light refractive index of the material of the first lens (L1), and Vd represents the Abbe number of the d-light of the material of the first lens (L1).
The second lens (L2) satisfies the following condition: 1.75 is more than or equal to Nd and more than or equal to 1.6, and 40 is more than or equal to Vd and more than or equal to 30, wherein Nd represents the d-light refractive index of the material of the second lens (L2), and Vd represents the Abbe number of the d-light of the material of the second lens (L2).
The third lens (L3) satisfies the following condition: 2.0 & gt, Nd & gt, 1.8, 42 & gt, Vd & gt, 32, wherein Nd represents the d-light refractive index of the material of the third lens (L3), and Vd represents the Abbe number of d-light of the material of the third lens (L3).
Focal length f of fourth lens (L4)4And the focal length f of the fifth lens (L5)5Satisfies the following conditions: -1.2. gtoreq.f4/f5≥-0.4
Focal length f of sixth lens (L6)6And the focal length f of the seventh lens (L7)7Satisfies the following conditions: -1.0. gtoreq.f7/f6≥-0.2
Focal length f of eighth lens (L8)8And the focal length f of the ninth lens (L9)9Satisfies the following conditions: -1.2 ≥f8/f9≥-0.4
The focal length f of the first lens (L1)1Second lens (L2) focal length f2Third lens (L3) focal length f3Fourth lens (L4) focal length f4Focal length f of fifth lens (L5)5Focal length f of sixth lens (L6)6Seventh lens (L7) focal length f7Focal length f of eighth lens (L8)8Focal length f of ninth lens (L9)9The following conditions are satisfied:
the large-aperture high-low temperature confocal optical device is characterized in that the value of FNO is in the following range
Where f is the system focal length and D is the entrance pupil diameter.
Fig. 2 to 7 are graphs of optical performance corresponding to the embodiments. Fig. 2 is a graph of MTF (modulation transfer function) at 20 ℃. The MTF is a function of the ratio of the modulation degree between the actual image and the ideal image at a certain spatial frequency with respect to the spatial frequency. The MTF curve has the spatial frequency lp/mm (per mm line pair) on the abscissa and the contrast (%) on the ordinate. The higher the curve, the better the imaging quality. Different curves represent different image heights, T and S respectively represent MTF in the meridian and sagittal directions, as can be seen from FIG. 2, in the full field of view, the resolution reaches 90lp/mm > 45%, and the requirement of high pixels of the lens is completely met; figure 3 is the utility model discloses out of focus curve when 20 ℃, out of focus curve shows to meridian, sagittal MTF and out of focus volume's the relation of the different visual fields of settlement space frequency, and the abscissa is out of focus volume in the picture, and the ordinate is the contrast, can see through this picture whether the best focal plane of each visual field is more unanimous, whether MTF is more sensitive to out of focus. As can be seen from FIG. 3, the optimal focal planes of the fields are substantially the same, and the image quality of the fields is uniform and clear; FIG. 4 is the defocus curve at-40 ℃ of the present invention, and it can be seen from FIG. 4 that at-40 ℃ of the present invention, there is no obvious defocus and the image quality is clear compared with the defocus curve at 20 ℃; FIG. 5 is the defocus curve at-85 deg.C, and it can be seen from FIG. 4 that at 85 deg.C, there is no obvious defocus and the image quality is clear compared with the defocus curve at 20 deg.C; fig. 6 is a field curvature graph of the present invention, which is represented by the wavelengths of three color lights of F, d, and C (F is 0.486um, d is 0.588um, and C is 0.656um), T and S respectively represent the meridian and arc quantities, the ordinate is the field of view, the unit is degree, the abscissa is field curvature, and the unit is millimeter (mm); fig. 7 is a distortion curve chart of the present invention, the ordinate is the view field, and the abscissa is the percentage value of distortion. The distortion curve graph represents the distortion magnitude under different view field conditions, the unit is% and the optical distortion | TVdistortion | of the system is less than or equal to 5% as can be known from FIG. 7, and the distortion curve graph belongs to small distortion and meets the design requirements of a monitoring system on distortion. Therefore, as can be seen from fig. 2 to 7, the system has corrected various aberrations to a better level.
In the present embodiment, the optical system preferred parameters are as follows:
| effective focal length | 11.53 |
| F/# (Aperture) | 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 elements, and for example, the refractive index of the second lens L2 is 1.66, and the abbe number is 36; the refractive index of the third lens L3 was 1.9, and the abbe number was 37.
The above description is only for the preferred embodiment of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (9)
1. A large-aperture high-low temperature confocal optical device is characterized by sequentially comprising:
a first lens (L1) with positive power, wherein the first lens (L1) is a meniscus convex lens with a convex surface facing the object side and a concave surface facing the image side;
a second lens (L2) having a negative optical power, said second lens (L2) being a biconcave lens;
a third lens (L3) having a positive optical power, said 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 cemented lens (J1) with positive power, the concave surface of the first cemented lens (J1) faces the object side, and the convex surface of the first cemented lens faces the image side;
a sixth lens (L6), a seventh lens (L7), said sixth lens (L6) being a concave lens, said seventh lens (L7) being a convex lens, said sixth lens (L6) being a second cemented lens (J2) of positive power cemented with said seventh lens (L7), said second cemented lens (J2) being a biconvex lens;
eighth lens (L8), ninth lens (L9), eighth lens (L8) be convex lens, ninth lens (L9) be concave lens, eighth lens (L8) with the third cemented lens (J3) of positive optical power that ninth lens (L9) veneer formed, the convex surface of third cemented lens (J3) towards the object side, the concave surface towards the image side.
2. The large aperture high and low temperature confocal optical device of claim 1, wherein: the first lens (L1) satisfies the following condition: 1.96 is more than or equal to Nd and more than or equal to 1.8, 45 is more than or equal to Vd and more than or equal to 35, wherein Nd represents the d-light refractive index of the material of the first lens (L1), and Vd represents the Abbe number of the d-light of the material of the first lens (L1).
3. The large aperture high and low temperature confocal optical device of claim 1, wherein: the second lens (L2) satisfies the following condition: 1.75 is more than or equal to Nd and more than or equal to 1.6, and 40 is more than or equal to Vd and more than or equal to 30, wherein Nd represents the d-light refractive index of the material of the second lens (L2), and Vd represents the Abbe number of the d-light of the material of the second lens (L2).
4. The large aperture high and low temperature confocal optical device of claim 1, wherein: the third lens (L3) satisfies the following condition: 2.0 & gt, Nd & gt, 1.8, 42 & gt, Vd & gt, 32, wherein Nd represents the d-light refractive index of the material of the third lens (L3), and Vd represents the Abbe number of d-light of the material of the third lens (L3).
5. The large aperture high and low temperature confocal optical device of claim 1, wherein: the focal length f of the fourth lens (L4)4And the focal length f of the fifth lens (L5)5Satisfies the following conditions: -1.2. gtoreq.f4/f5≥-0.4。
6. The large aperture high and low temperature confocal optical device of claim 1, wherein:the focal length f of the sixth lens (L6)6And the focal length f of the seventh lens (L7)7Satisfies the following conditions: -1.0. gtoreq.f7/f6≥-0.2。
7. The large aperture high and low temperature confocal optical device of claim 1, wherein: the focal length f of the eighth lens (L8)8And the focal length f of the ninth lens (L9)9Satisfies the following conditions: -1.2. gtoreq.f8/f9≥-0.4。
8. The large aperture high and low temperature confocal optical device of claim 1, wherein: the focal length f of the first lens (L1)1Second lens (L2) focal length f2Third lens (L3) focal length f3Fourth lens (L4) focal length f4Focal length f of fifth lens (L5)5Focal length f of sixth lens (L6)6Seventh lens (L7) focal length f7Focal length f of eighth lens (L8)8Focal length f of ninth lens (L9)9The following conditions are satisfied:
9. the large aperture high and low temperature confocal optical device of claim 1 further characterized by FNO
Where f is the system focal length and D is the entrance pupil diameter.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111812814A (en) * | 2020-09-08 | 2020-10-23 | 常州市瑞泰光电有限公司 | Image pickup optical lens |
| CN111812809A (en) * | 2020-09-03 | 2020-10-23 | 常州市瑞泰光电有限公司 | Image pickup optical lens |
| CN111929854A (en) * | 2020-10-13 | 2020-11-13 | 瑞泰光学(常州)有限公司 | Image pickup optical lens |
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2019
- 2019-04-30 CN CN201920615756.5U patent/CN210294654U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111812809A (en) * | 2020-09-03 | 2020-10-23 | 常州市瑞泰光电有限公司 | Image pickup optical lens |
| CN111812809B (en) * | 2020-09-03 | 2020-11-27 | 常州市瑞泰光电有限公司 | Image pickup optical lens |
| CN111812814A (en) * | 2020-09-08 | 2020-10-23 | 常州市瑞泰光电有限公司 | Image pickup optical lens |
| CN111812814B (en) * | 2020-09-08 | 2020-11-27 | 常州市瑞泰光电有限公司 | Image pickup optical lens |
| CN111929854A (en) * | 2020-10-13 | 2020-11-13 | 瑞泰光学(常州)有限公司 | Image pickup optical lens |
| WO2022077607A1 (en) * | 2020-10-13 | 2022-04-21 | 诚瑞光学(深圳)有限公司 | Optical camera lens |
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