CN211086778U - Miniaturized day and night dual-purpose wide-angle lens - Google Patents
Miniaturized day and night dual-purpose wide-angle lens Download PDFInfo
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- CN211086778U CN211086778U CN201922349978.XU CN201922349978U CN211086778U CN 211086778 U CN211086778 U CN 211086778U CN 201922349978 U CN201922349978 U CN 201922349978U CN 211086778 U CN211086778 U CN 211086778U
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Abstract
The utility model provides a miniaturized day and night dual-purpose wide-angle lens, which can meet the requirements of realizing miniaturization, wide visual angle, day and night confocal and temperature adaptability; it includes that from the object side to the image side setting: a first lens group having a negative focal power; a second lens group having a positive refractive power; the first lens group and the second lens group satisfy the following relationship: -5 < F11/F < -11, 1.6 < F22/F < 1.9, wherein F11 is the focal length of the first lens group, F22 is the focal length of the second lens group, and F is the focal length of the miniaturized day-night wide-angle lens.
Description
Technical Field
The utility model relates to an optical imaging technical field specifically is miniaturized day dual-purpose wide-angle lens night.
Background
With the rapid development and wide application of the intelligent safety driving-assisting monitoring system, the requirement for the monitoring lens with a wide viewing angle is continuously improved, the wide-angle lens is continuously developing towards the direction of miniaturization, wide viewing angle, day and night confocal and temperature adaptability, and accordingly the wide-angle lens with a new framework needs to be researched and developed urgently.
Disclosure of Invention
To the problem, the utility model provides a miniaturized day night dual-purpose wide-angle lens, it can satisfy and realize miniaturization, wide visual angle, day night confocal and temperature adaptability requirement.
The technical scheme is as follows: miniaturized day dual-purpose wide-angle lens night, its characterized in that: it includes that from the object side to the image side setting: a first lens group having a negative focal power; a second lens group having a positive refractive power;
the first lens group and the second lens group satisfy the following relationship:
-5 < F11/F < -11, 1.6 < F22/F < 1.9, wherein F11 is the focal length of the first lens group, F22 is the focal length of the second lens group, and F is the focal length of the miniaturized day-night wide-angle lens.
It is further characterized in that:
it still includes that it sets gradually from the object space to the image space: the diaphragm is arranged between the first lens group and the second lens group, the IR filter is arranged on the image surface side of the second lens group, and the protective glass is arranged on the image surface side of the IR filter;
the first lens group comprises the following components arranged from an object side to an image side in sequence: a first lens having a negative refractive power, wherein the object plane side is a convex surface and the image plane side is a concave surface;
a second lens having a negative refractive power, wherein the object plane side is a convex surface and the image plane side is a concave surface;
a third lens having positive refractive power, wherein the object plane side is a convex surface and the image plane side is a convex surface;
the second lens group comprises the following components arranged from an object side to an image side in sequence: a fourth lens having positive refractive power, wherein the object plane side is a concave surface and the image plane side is a convex surface;
a fifth lens having positive refractive power, the object plane side being a convex surface and the image plane side being a convex surface;
a sixth lens element having a negative refractive power, wherein the object plane side is a concave surface and the image plane side is a convex surface;
the fifth lens and the sixth lens are combined into a double-cemented lens, and the double-cemented lens satisfies the following conditions: 2 < F56/F < 5, wherein F56 is the focal length value of the double cemented lens;
the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens satisfy that: nd1 is more than or equal to 1.72, Nd2 is more than or equal to 1.5 and less than or equal to 1.65, Nd3 is more than or equal to 1.65 and less than or equal to 1.85, Nd4 is more than or equal to 1.4 and less than or equal to 1.6, Nd5 is more than or equal to 1.5 and less than or equal to 1.6, and Nd6 is more than or equal to 1.8 and less than or equal; wherein Nd1 is the D-light refractive index of the first lens, Nd2 is the D-light refractive index of the second lens, Nd3 is the D-light refractive index of the third lens, Nd4 is the D-light refractive index of the fourth lens, Nd5 is the D-light refractive index of the fifth lens, and Nd6 is the D-light refractive index of the sixth lens;
the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens satisfy that: d1/2r2 is more than 0.8 and less than 1, r3/r4 is more than or equal to 1.5 and less than or equal to 4.5, r6/r5 is more than or equal to 6 and less than or equal to-3, r8/r9 is more than or equal to 1 and less than or equal to 11, r10/r11 is more than or equal to 6.5 and less than or equal to-2.5, and r11/r12 is more than or equal to 1 and less than or equal to; wherein D1 is the aperture of the first lens, and r2 is the curvature radius of the first lens close to the image plane; r3 is the curvature radius of the second lens close to the object plane, and r4 is the curvature radius of the second lens close to the image plane; r5 is the curvature radius of the third lens close to the object plane, and r6 is the curvature radius of the third lens close to the image plane; r8 is the curvature radius of the fourth lens close to the object plane, and r9 is the curvature radius of the fourth lens close to the image plane; r10 is the curvature radius of the fifth lens close to the object plane, and r11 is the curvature radius of the fifth lens close to the image plane; r12 is the curvature radius of the sixth lens close to the image plane;
the focal length values of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens meet the following conditions: -1.5 < F1/F < -0.5, -4 < F2/F < -2, 0.25 < F3/F4 < 0.45, 3 < F5/F < 5, 7 < F6/F < 8, wherein F1 is the first lens focal length, F2 is the second lens focal length, F3 is the third lens focal length, and F4 is the fourth lens focal length; f5 is the fifth lens focal length, F6 is the sixth lens focal length;
the lenses of the miniaturized day and night dual-purpose wide-angle lens are all glass spherical lenses.
The beneficial effects of the utility model are that, its simple structure, easily processing and equipment are being provided with the first lens group that has negative focal power from the object space to the image space, the second lens group that has positive focal power, thereby the optical lens who forms, can effectively realize controlling stray light, correct the various aberrations of visible light and infrared light, in order to keep high resolution, can all obtain higher imaging quality in low light or night environment, satisfy wide angle lens's miniaturization, wide visual angle, day night is confocal and temperature adaptability requirement.
Drawings
FIG. 1 is a structural combination diagram of a miniaturized day-night wide-angle lens of the present invention;
FIG. 2 is a graph of MTF of the visible light band of the present invention;
FIG. 3 is a graph of MTF of the infrared band of the present invention;
fig. 4 is a distortion plot of the present invention;
FIG. 5 is a defocusing graph at 25 ℃ of the ambient temperature of the visible light band in the embodiment of the present invention;
fig. 6 is a defocusing curve diagram at an ambient temperature of 25 ℃ in the infrared band according to the embodiment of the present invention.
Detailed Description
As shown in fig. 1-6, the utility model discloses miniaturized day night dual-purpose wide-angle lens, it includes that it sets up from the object space to the image space: a first lens group having a negative focal power; a second lens group having a positive refractive power;
the first lens group and the second lens group satisfy the following relationship:
-5 < F11/F < -11, 1.6 < F22/F < 1.9, wherein F11 is the focal length of the first lens group, F22 is the focal length of the second lens group, and F is the focal length of the miniaturized day-night wide-angle lens.
The optical lens further comprises an optical diaphragm, an IR color filter and a protective glass CG which are arranged in sequence from the object side to the image side, wherein the optical diaphragm is arranged between the first lens group and the second lens group, the IR color filter is arranged on the image surface side of the sixth lens L6, and the protective glass CG is arranged on the image surface side of the IR color filter.
The first lens group comprises a first lens L1 with negative focal power, a convex object surface side and a concave image surface side, which are arranged in sequence from the object side to the image side;
a second lens L2 having negative refractive power, the object plane side being convex and the image plane side being concave;
the third lens L3 has positive refractive power, and has a convex object-plane side and a convex image-plane side.
The first lens L satisfies that Nd1 is more than or equal to 1.72, so that light rays in a wider visual angle range can be effectively converged, the caliber of the first lens L is reduced, and miniaturization of the optical lens is facilitated, wherein Nd1 is the D light refractive index of the first lens L, the second lens L, the third lens L, the fourth lens L, the fifth lens L5 and the sixth lens L satisfy that Nd2 is more than or equal to 1.5, Nd3 is more than or equal to 1.85, Nd4 is more than or equal to 1.6, Nd5 is more than or equal to 1.5 and less than or equal to 1.6 and Nd6 is more than or equal to 1.8 and less than or equal to 2.0, wherein Nd1 is the D refractive index of the first lens L, Nd2 is the D light refractive index of the second lens L, and L is the D light refractive index of the third lens L, Nd 72 is the fourth lens L, Nd L is the D light refractive index of the fifth lens L and L is the sixth lens 366.
The first lens L1 satisfies that 0.8 < D1/2r2 < 1, such as by defining 0.8 < D1/2r2 < 0.93, the risk of the first lens L1 exceeding the hemisphere can be effectively controlled, and the processing of the first lens L01 is facilitated, while the first lens L11 has a certain curvature, and the aberration of the optical system can be corrected to a certain extent, the second lens L, the third lens L, the fourth lens L, the fifth lens L, the sixth lens L satisfies 1.5 < r L/r L < 4.5, -6 < r L/r L < 3, 1 < r L/r L < 11, -6.5 < r L/r L < 2.5, 1 < r L/r L < 2, wherein D L is the aperture of the first lens 3671, r L is the radius of the first lens L, the radius of the first lens L is the radius of the image surface of the fourth lens L, the radius of the image surface of the fifth lens L is the image surface of the image surface, the image surface of the image surface.
The focal length values of the first lens L1, the second lens L2, the third lens L03, the fourth lens L14, the fifth lens L5 and the sixth lens L6 meet the requirements that-1.5 < F1/F < -0.5, -4 < F2/F < -2, -0.25 < F3/F4 < 0.45, 3 < F5/F < 5 and 7 < F6/F < 8, wherein F1 is the focal length of the first lens L1, F2 is the focal length of the second lens L2, F3 is the focal length of the third lens L3, F4 is the focal length of the fourth lens L4, F5 is the focal length of the fifth lens L5, F6 is the focal length of the sixth lens L6, and the focal length of the third lens 5/F < 5 is limited, so that the total length of the miniaturized day-night wide-angle lens can be controlled and the system aberration can be corrected to a certain extent.
The second lens group comprises a fourth lens L4 with positive focal power, a concave object surface side and a convex image surface side, which are arranged in sequence from the object side to the image side;
a fifth lens L5 having positive refractive power, the object plane side being convex and the image plane side being convex;
a sixth lens L6 having negative refractive power, and having a concave object-surface side and a convex image-surface side;
the fifth lens L5 and the sixth lens L6 are combined to form a double cemented lens, which can effectively control the chromatic aberration, wherein the double cemented lens satisfies the relationship 2 < F56/F < 5, and F56 is the focal length of the double cemented lens.
The lenses of the miniaturized day and night wide-angle lens are all glass spherical lenses, namely, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all glass spherical lenses, or the lenses of the miniaturized day and night wide-angle lens are not limited to spherical lenses according to circumstances, and at least one of the lenses can be a glass aspheric lens.
The utility model adopts only 6 lenses, the visual angle can reach more than 150 degrees, the image circle can reach 7mm, and the stray light can be effectively controlled, thereby meeting the shooting requirement of the wide-angle lens; the overall characteristics of short, small and light weight of the wide-angle lens can be maintained, various aberrations of visible light and infrared light can be corrected at the same time, so that high resolution is kept, and high imaging quality can be obtained in low-illumination or night environments; in addition, the lens has regular shape, simple structure and easy processing and assembly.
The embodiment of the present invention provides the following optical parameters 1:
in table 1, when the radius of curvature of the surface such as the diaphragm, the IR filter, and the cover glass is Infinity, this surface is a plane.
In the embodiment of the present invention, the effective focal length F of the miniaturized wide-angle lens for day and night use is 3.3, the F-number FNO is 2.4, the total field angle FOV is 150 °, and the total length TT L is 14.67.
Fig. 2 is a MTF graph of the visible light band of the present invention, wherein the abscissa is spatial frequency, the ordinate is contrast, TS diff. L init is diffraction limit in the meridional and sagittal directions, and TS 0.00(deg) represents the diffraction curve in the meridional and sagittal directions in the image plane 0.00 field of view.
Fig. 3 is a MTF graph of the infrared (850nm) band of the present invention, wherein the abscissa is spatial frequency and the ordinate is contrast, TS diff. L init is the diffraction limit in the meridional and sagittal directions, and TS 0.00(deg) represents the diffraction curve in the meridional and sagittal directions over the image plane 0.00 field of view.
Fig. 4 is a distortion curve chart of the present invention, that is, a field curvature and distortion curve chart in the visible light band, wherein the distortion amount is controlled within 75%; the left image is a field curvature curve graph, the ordinate of the field curvature graph is the angle of view, the abscissa is the distance of an image point from a paraxial image surface, T represents meridional field curvature, and S represents sagittal field curvature; the right graph is a distortion graph, the ordinate of which is the field angle and the abscissa of which is the distortion percentage.
FIG. 5 is a defocusing graph at 25 ℃ of the ambient temperature of the visible light band in the embodiment of the present invention; wherein, the abscissa is defocusing amount, and takes millimeter as a unit, and the ordinate is contrast; TS 0.00(deg) represents the diffraction curves in the meridional and sagittal directions at the image plane 0.00 field of view.
FIG. 6 is a defocusing graph of the infrared (850nm) band at 25 deg.C; wherein, the abscissa is defocusing amount, and takes millimeter as a unit, and the ordinate is contrast; TS 0.00(deg) represents the diffraction curves in the meridional and sagittal directions at the image plane 0.00 field of view.
As can be seen from fig. 2 and 3, and fig. 4 and 5, at a resolution frequency of 60lp/mm, the MTF of the visual field at the center (0,0) of the visible light band approaches to 0.8, the defocus curve is concentrated, and the resolution is high; the MTF of the infrared 850nm central (0,0) view field can be close to 0.7, the focal plane offset of the central (0,0) view field relative to the visible light central (0,0) view field is within 10um, and a defocusing curve is more concentrated, so that the infrared confocal degree of the wide-angle lens is better.
Claims (9)
1. Miniaturized day dual-purpose wide-angle lens night, its characterized in that: it includes that from the object side to the image side setting: a first lens group having a negative focal power; a second lens group having a positive refractive power;
the first lens group and the second lens group satisfy the following relationship:
-5 < F11/F < -11, 1.6 < F22/F < 1.9, wherein F11 is the focal length of the first lens group, F22 is the focal length of the second lens group, and F is the focal length of the miniaturized day-night wide-angle lens.
2. A miniaturized day-night wide-angle lens as claimed in claim 1, characterized in that: it still includes that it sets gradually from the object space to the image space: the optical diaphragm is arranged between the first lens group and the second lens group, the IR filter is arranged on the image surface side of the second lens group, and the protective glass is arranged on the image surface side of the IR filter.
3. A miniaturized day-night wide-angle lens as claimed in claim 1, characterized in that: the first lens group comprises the following components arranged from an object side to an image side in sequence: a first lens having a negative refractive power, wherein the object plane side is a convex surface and the image plane side is a concave surface;
a second lens having a negative refractive power, wherein the object plane side is a convex surface and the image plane side is a concave surface;
and a third lens having positive refractive power, wherein the object plane side is a convex surface and the image plane side is a convex surface.
4. A miniaturized day-night wide-angle lens as claimed in claim 3, characterized in that: the second lens group comprises the following components arranged from an object side to an image side in sequence: a fourth lens having positive refractive power, wherein the object plane side is a concave surface and the image plane side is a convex surface;
a fifth lens having positive refractive power, the object plane side being a convex surface and the image plane side being a convex surface;
and a sixth lens having negative refractive power, wherein the object plane side is a concave surface and the image plane side is a convex surface.
5. The miniaturized day-night wide-angle lens of claim 4, wherein: the fifth lens and the sixth lens are combined into a double-cemented lens, and the double-cemented lens satisfies the following conditions: 2 < F56/F < 5, wherein F56 is the focal length value of the double cemented lens.
6. The miniaturized day-night wide-angle lens of claim 4, wherein: the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens satisfy that: nd1 is more than or equal to 1.72, Nd2 is more than or equal to 1.5 and less than or equal to 1.65, Nd3 is more than or equal to 1.65 and less than or equal to 1.85, Nd4 is more than or equal to 1.4 and less than or equal to 1.6, Nd5 is more than or equal to 1.5 and less than or equal to 1.6, and Nd6 is more than or equal to 1.8 and less than or equal; wherein Nd1 is the D-light refractive index of the first lens, Nd2 is the D-light refractive index of the second lens, Nd3 is the D-light refractive index of the third lens, Nd4 is the D-light refractive index of the fourth lens, Nd5 is the D-light refractive index of the fifth lens, and Nd6 is the D-light refractive index of the sixth lens.
7. The miniaturized day-night wide-angle lens of claim 4, wherein: the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens satisfy that: d1/2r2 is more than 0.8 and less than 1, r3/r4 is more than or equal to 1.5 and less than or equal to 4.5, r6/r5 is more than or equal to 6 and less than or equal to-3, r8/r9 is more than or equal to 1 and less than or equal to 11, r10/r11 is more than or equal to 6.5 and less than or equal to-2.5, and r11/r12 is more than or equal to 1 and less than or equal to; wherein D1 is the aperture of the first lens, and r2 is the curvature radius of the first lens close to the image plane; r3 is the curvature radius of the second lens close to the object plane, and r4 is the curvature radius of the second lens close to the image plane; r5 is the curvature radius of the third lens close to the object plane, and r6 is the curvature radius of the third lens close to the image plane; r8 is the curvature radius of the fourth lens close to the object plane, and r9 is the curvature radius of the fourth lens close to the image plane; r10 is the curvature radius of the fifth lens close to the object plane, and r11 is the curvature radius of the fifth lens close to the image plane; r12 is the curvature radius of the sixth lens close to the image plane.
8. The miniaturized day-night wide-angle lens of claim 4, wherein: the focal length values of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens meet the following conditions: -1.5 < F1/F < -0.5, -4 < F2/F < -2, 0.25 < F3/F4 < 0.45, 3 < F5/F < 5, 7 < F6/F < 8, wherein F1 is the first lens focal length, F2 is the second lens focal length, F3 is the third lens focal length, and F4 is the fourth lens focal length; f5 is the fifth lens focal length and F6 is the sixth lens focal length.
9. A miniaturized day-night wide-angle lens as claimed in claim 1, characterized in that: the lenses of the miniaturized day and night dual-purpose wide-angle lens are all glass spherical lenses.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922349978.XU CN211086778U (en) | 2019-12-24 | 2019-12-24 | Miniaturized day and night dual-purpose wide-angle lens |
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| CN201922349978.XU CN211086778U (en) | 2019-12-24 | 2019-12-24 | Miniaturized day and night dual-purpose wide-angle lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110908094A (en) * | 2019-12-24 | 2020-03-24 | 协益电子（苏州）有限公司 | Miniaturized day-night dual-purpose wide-angle lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110908094A (en) * | 2019-12-24 | 2020-03-24 | 协益电子（苏州）有限公司 | Miniaturized day-night dual-purpose wide-angle lens |
| CN110908094B (en) * | 2019-12-24 | 2023-11-24 | 协益电子（苏州）有限公司 | Miniaturized day night dual-purpose wide-angle lens |
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