CN109445078B - Super wide angle lens - Google Patents
Super wide angle lens Download PDFInfo
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- CN109445078B CN109445078B CN201811307628.0A CN201811307628A CN109445078B CN 109445078 B CN109445078 B CN 109445078B CN 201811307628 A CN201811307628 A CN 201811307628A CN 109445078 B CN109445078 B CN 109445078B
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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
- G02B13/001—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
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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Abstract
The invention relates to an ultra-wide angle lens, which comprises a first lens (1) with negative focal power, a second lens (2) with negative focal power, a third lens (3) with positive focal power, a fourth lens (4) with positive focal power, a fifth lens (5) and a sixth lens (6) with opposite focal power, wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens are sequentially arranged from an object side to an image side along an optical axis; the focal length f of the ultra-wide angle lens and the focal length f4 of the fourth lens (4) satisfy the relation: f4/f is more than or equal to 1.2 and less than or equal to 2.8. The ultra-wide angle lens has the characteristics of small volume, large angle of view and the like, can realize confocal of visible light and infrared light bands, has resolution of more than 500 ten thousand, and has small imaging performance drift along with temperature change.
Description
Technical Field
The invention relates to the technical field of optical system and device design, in particular to an ultra-wide angle lens.
Background
In recent years, with the rapid development of science and technology and the gradual improvement of people on safety consciousness, the application of the security monitoring system is more and more extensive, and the requirement on a matched optical system is also more and more high.
The wide-angle lens can shoot scenes with larger areas in a shorter shooting distance range due to large field angle, so the wide-angle lens is widely applied to the field of security monitoring. With the increasing requirements of people on security monitoring, the requirements on performance indexes such as the angle of view, resolution, cost performance and solving temperature drift of a wide-angle lens are also more and more severe.
Disclosure of Invention
An object of the present invention is to provide an ultra-wide angle lens having high performance.
In order to achieve the above object, the present invention provides an ultra-wide angle lens, comprising a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens and a sixth lens with opposite focal power, which are sequentially arranged from an object side to an image side along an optical axis;
The focal length f of the ultra-wide angle lens and the focal length f4 of the fourth lens satisfy the following relation: f4/f is more than or equal to 1.2 and less than or equal to 2.8.
According to one aspect of the invention, the first lens and the fourth lens are glass spherical lenses;
The second lens, the third lens, the fifth lens and the sixth lens are plastic aspheric lenses.
According to one aspect of the present invention, in a direction from an object side to an image side along an optical axis, the first lens and the second lens are both convex on an object side surface and concave on an image side surface;
The object side surface of the third lens is a concave surface, and the image side surface is a convex surface;
The object side surface and the image side surface of the fourth lens are both convex.
According to one aspect of the present invention, the first lens focal length f1 and the focal length f2 of the second lens satisfy the relationship: f2/f1 is less than or equal to 1.2 and less than or equal to 3.
According to one aspect of the present invention, a relationship between a focal length f5 of the fifth lens and a focal length f6 of the sixth lens is satisfied: -1.8.ltoreq.f5/f6.ltoreq.0.5.
According to one aspect of the present invention, the relationship between the focal length f of the ultra-wide angle lens and the distance dt from the object side surface to the image side surface of the first lens element satisfies: dt/f is more than or equal to 4.5 and less than or equal to 6.5.
According to one aspect of the present invention, the focal length f of the ultra-wide angle lens and the distance db from the object side surface to the image side surface of the sixth lens element satisfy the relationship: f/db is more than or equal to 0.3 and less than or equal to 1.2.
According to one aspect of the present invention, the relation between the abbe number v5 of the fifth lens and the abbe number v6 of the sixth lens is satisfied: and the absolute value of v5-v6 is more than or equal to 25 and less than or equal to 45.
According to one aspect of the invention, the first lens and/or the fourth lens is a low dispersion glass lens, and the Abbe number VD of the low dispersion glass is not less than 60.
According to one aspect of the invention, the total optical length of the ultra-wide angle lens is less than 12mm.
The ultra-wide angle lens has two forms, namely, the focal power of six lenses is negative, positive and negative in sequence along the direction from the object side to the image side, or the focal power of six lenses is negative, positive, negative and positive in sequence along the direction from the object side to the image side. The ultra-wide angle lens further comprises a diaphragm S, wherein the diaphragm S is arranged between the third lens and the fourth lens, the focal length of the ultra-wide angle lens is f, the focal length of the fourth lens is f4, and the relation between f and f4 is satisfied: f4/f is more than or equal to 1.2 and less than or equal to 2.8. The lens is arranged in the mode, so that the lens has a large angle of view and high resolution, the maximum angle of view can reach 220 degrees, the resolution can reach more than 500 ten thousand, and meanwhile, the lens has the advantages of correcting aberration, reducing tolerance sensitivity and the like.
According to one aspect of the present invention, the first lens and the fourth lens are glass spherical lenses, and the second lens, the third lens, the fifth lens and the sixth lens are plastic aspherical lenses. The ultra-wide angle lens adopts the scheme of reasonably matching the glass spherical lens and the plastic aspherical lens, fully utilizes the advantage of correcting aberration of the aspherical lens, and simultaneously greatly eliminates the problem of back focus drift caused by temperature change through reasonable lens layout, so that the ultra-wide angle lens can ensure the same resolution as that in a normal temperature state without refocusing under the environment temperature change of-40 ℃ to 80 ℃. Meanwhile, due to the adoption of the scheme that the glass spherical lens and the plastic aspherical lens are matched, the excellent performance of the lens is ensured, the cost is reduced, and the cost performance is high.
According to an aspect of the present invention, a relationship between a focal length f1 of the first lens and a focal length f2 of the second lens is satisfied: f2/f1 is less than or equal to 1.2 and less than or equal to 3. The lens can effectively reduce field curvature and astigmatism generated by light rays with large incidence angles of the ultra-wide angle lens and improve the resolution of the marginal view field of the lens.
According to an aspect of the present invention, a relationship between a focal length f5 of the fifth lens and a focal length f6 of the sixth lens is satisfied: -1.8.ltoreq.f5/f6.ltoreq.0.5. The fifth lens 5 and the sixth lens meet the limitation of the relation, so that the temperature drift of the lens is balanced, and the influence of the refractive index of the plastic lens on the temperature drift and the aberration balance is reduced.
According to an aspect of the present invention, the relationship between the focal length f of the ultra-wide angle lens and the distance dt from the object side surface to the image side surface of the first lens element satisfies: dt/f is more than or equal to 4.5 and less than or equal to 6.5. Therefore, the aberration balance of the ultra-wide angle lens can be further ensured, and the volume is reduced. When the aberration balance of the lens is smaller than the lower limit value of the above-mentioned relational expression, the aberration balance of the lens is limited, and it is difficult to improve the resolution. When the value exceeds the upper limit value of the above relation, the volume of the lens increases, and the processing becomes difficult and the cost increases.
According to an aspect of the present invention, the focal length f of the ultra-wide angle lens of the present invention and the distance db from the object side surface to the image side surface of the sixth lens element satisfy the following relationship: f/db is more than or equal to 0.3 and less than or equal to 1.2. Therefore, the high resolution of the large field of view can be ensured, and enough allowance is provided for the structural design of the back focal section.
According to an aspect of the present invention, the relation between the abbe number v5 of the fifth lens and the abbe number v6 of the sixth lens is satisfied: and the absolute value of v5-v6 is more than or equal to 25 and less than or equal to 45. The chromatic aberration can be effectively corrected by meeting the relation, and the reasonable balance of chromatic aberration is achieved.
According to one aspect of the present invention, the first lens and/or the fourth lens is a low-dispersion glass lens, and the Abbe number VD is not less than 60. That is, at least one of the spherical glass lenses in the super wide angle lens of the present invention is a low dispersion glass lens. The arrangement of the low-dispersion glass is beneficial to correcting chromatic aberration and secondary spectrum chromatic aberration, reducing infrared defocus and improving resolution in visible light and infrared light states.
Drawings
Fig. 1 is a block diagram schematically showing an ultra-wide angle lens according to embodiment 1 of the present invention;
fig. 2 is a view schematically showing MTF in the normal temperature visible light band of the ultra-wide angle lens according to embodiment 1 of the present invention;
Fig. 3 is a view schematically showing MTF at normal temperature infrared light band of the ultra-wide-angle lens according to embodiment 1 of the present invention;
fig. 4 is a graph schematically showing defocus at normal temperature of the ultra-wide angle lens according to embodiment 1 of the present invention;
FIG. 5 is a graph schematically showing defocus at-40℃of an ultra-wide angle lens according to embodiment 1 of the present invention;
Fig. 6 is a graph schematically showing defocus at a high temperature of 80 c for an ultra-wide angle lens according to embodiment 1 of the present invention;
Fig. 7 is a block diagram schematically showing an ultra-wide angle lens according to embodiment 2 of the present invention;
Fig. 8 is a view schematically showing MTF in the normal temperature visible light band of the ultra-wide angle lens according to embodiment 2 of the present invention;
Fig. 9 is a view schematically showing MTF at normal temperature infrared light band of the ultra-wide-angle lens according to embodiment 2 of the present invention;
fig. 10 is a graph schematically showing defocus at normal temperature of an ultra-wide angle lens according to embodiment 2 of the present invention;
FIG. 11 is a graph schematically showing defocus at-40℃of an ultra-wide angle lens according to embodiment 2 of the present invention;
FIG. 12 is a graph schematically showing defocus at a high temperature of 80℃for an ultra-wide-angle lens according to embodiment 2 of the present invention;
Fig. 13 is a block diagram schematically showing an ultra-wide angle lens according to embodiment 3 of the present invention;
fig. 14 is a view schematically showing MTF at normal temperature visible light band of the ultra-wide-angle lens according to embodiment 3 of the present invention;
Fig. 15 schematically shows an MTF diagram in the normal temperature infrared band of the ultra-wide angle lens according to embodiment 3 of the present invention;
Fig. 16 is a graph schematically showing defocus at normal temperature of the ultra-wide angle lens according to embodiment 3 of the present invention;
FIG. 17 is a graph schematically showing defocus at-40℃of the ultra-wide angle lens according to embodiment 3 of the present invention;
FIG. 18 is a graph schematically showing defocus at a high temperature of 80℃for an ultra-wide-angle lens according to embodiment 3 of the present invention;
fig. 19 is a block diagram schematically showing an ultra-wide angle lens according to embodiment 4 of the present invention;
fig. 20 is a view schematically showing MTF in the normal temperature visible light band of the ultra-wide angle lens according to embodiment 4 of the present invention;
Fig. 21 is a view schematically showing MTF at normal temperature infrared light band of the ultra-wide-angle lens according to embodiment 4 of the present invention;
fig. 22 is a graph schematically showing defocus at normal temperature of the ultra-wide angle lens according to embodiment 4 of the present invention;
FIG. 23 is a graph schematically showing defocus at-40℃of the ultra-wide angle lens according to embodiment 4 of the present invention;
FIG. 24 is a graph schematically showing defocus at high temperature of 80℃for an ultra-wide-angle lens according to embodiment 4 of the present invention;
fig. 25 is a block diagram schematically showing an ultra-wide angle lens according to embodiment 5 of the present invention;
Fig. 26 is a view schematically showing MTF in the normal temperature visible light band of the ultra-wide angle lens according to embodiment 5 of the present invention;
fig. 27 is a view schematically showing MTF at normal temperature infrared light band of the ultra-wide-angle lens according to embodiment 5 of the present invention;
fig. 28 is a graph schematically showing defocus at normal temperature of the ultra-wide angle lens according to embodiment 5 of the present invention;
FIG. 29 is a graph schematically showing defocus at-40℃of the ultra-wide angle lens according to example 5 of the present invention;
fig. 30 is a graph schematically showing defocus at high temperature of 80 c for the ultra-wide angle lens according to embodiment 5 of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments will be briefly described below. It is apparent that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
In describing embodiments of the present invention, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in terms of orientation or positional relationship shown in the drawings for convenience of description and simplicity of description only, and do not denote or imply that the devices or elements in question must have a particular orientation, be constructed and operated in a particular orientation, so that the above terms are not to be construed as limiting the invention.
The present invention will be described in detail below with reference to the drawings and the specific embodiments, which are not described in detail herein, but the embodiments of the present invention are not limited to the following embodiments.
Fig. 1 is a block diagram schematically showing an ultra-wide angle lens according to an embodiment of the present invention. As shown in fig. 1, the ultra-wide angle lens of the present invention includes six lenses, namely, the first lens 1 with negative focal power, the second lens 2 with negative focal power, the third lens 3 with positive focal power, the fourth lens 4 with positive focal power, the fifth lens 5 with opposite focal power and the sixth lens 6, respectively, along the direction from the object side to the image side, wherein the focal power of the six lenses is sequentially negative, positive, negative, or is sequentially negative, positive, negative, or positive along the direction from the object side to the image side. The ultra-wide angle lens further comprises a diaphragm S, wherein the diaphragm S is arranged between the third lens 3 and the fourth lens 4, the focal length of the ultra-wide angle lens is f, the focal length of the fourth lens 4 is f4, and the relation between f and f4 is satisfied: f4/f is more than or equal to 1.2 and less than or equal to 2.8.
The ultra-wide angle lens is arranged according to the mode, so that the lens has a large angle of view and high resolution, the maximum angle of view can reach 220 degrees, the resolution can reach more than 500 ten thousand, and the ultra-wide angle lens has the advantages of correcting aberration, reducing tolerance sensitivity and the like.
In the ultra-wide angle lens of the invention, the first lens 1 and the fourth lens 4 are glass spherical lenses, and the second lens 2, the third lens 3, the fifth lens 5 and the sixth lens 6 are plastic aspherical lenses. The ultra-wide angle lens adopts the scheme of reasonably matching the glass spherical lens and the plastic aspherical lens, fully utilizes the advantage of correcting aberration of the aspherical lens, and simultaneously greatly eliminates the problem of back focus drift caused by temperature change through reasonable lens layout, so that the ultra-wide angle lens can ensure the same resolution as that in a normal temperature state without refocusing under the environment temperature change of-40 ℃ to 80 ℃. Meanwhile, due to the adoption of the scheme that the glass spherical lens and the plastic aspherical lens are matched, the excellent performance of the lens is ensured, the cost is reduced, and the cost performance is high.
In the ultra-wide angle lens of the present invention, the object side surface of the first lens element 1 is convex and the image side surface is concave along the direction from the object side to the image side along the optical axis. The object-side surface of the second lens element 2 is convex, and the image-side surface thereof is concave. The third lens element 3 has a concave object-side surface and a convex image-side surface. The fourth lens element 4 has a convex object-side surface and a convex image-side surface.
In the present invention, the focal length of the first lens 1 is f1, the focal length of the second lens 2 is f2, and the relationship between the focal length f1 of the first lens 1 and the focal length f2 of the second lens 2 is satisfied: f2/f1 is less than or equal to 1.2 and less than or equal to 3. The lens can effectively reduce field curvature and astigmatism generated by light rays with large incidence angles of the ultra-wide angle lens and improve the resolution of the marginal view field of the lens.
In the present invention, the focal length of the fifth lens 5 is f5, the focal length of the sixth lens 6 is f6, and the relationship between the focal length f5 of the fifth lens 5 and the focal length f6 of the sixth lens 6 is satisfied: -1.8.ltoreq.f5/f6.ltoreq.0.5. The fifth lens 5 and the sixth lens 6 meet the limitation of the relation, which is favorable for balancing the temperature drift of the lens and reducing the influence of the refractive index of the plastic lens on the temperature drift and the aberration balance.
In the present invention, the distance from the object side surface of the first lens element 1 to the image side surface is dt, and the focal length f of the ultra-wide angle lens assembly of the present invention and the distance dt from the object side surface of the first lens element 1 to the image side surface satisfy the following relationship: dt/f is more than or equal to 4.5 and less than or equal to 6.5. Therefore, the aberration balance of the ultra-wide angle lens can be further ensured, and the volume is reduced. When the aberration balance of the lens is smaller than the lower limit value of the above-mentioned relational expression, the aberration balance of the lens is limited, and it is difficult to improve the resolution. When the value exceeds the upper limit value of the above relation, the volume of the lens increases, and the processing becomes difficult and the cost increases.
In the present invention, the distance from the object side surface of the sixth lens element 6 to the image side surface is db, and the focal length f of the ultra-wide angle lens assembly of the present invention and the distance db from the object side surface of the sixth lens element 6 to the image side surface satisfy the following relationship: f/db is more than or equal to 0.3 and less than or equal to 1.2. Therefore, the high resolution of the large field of view can be ensured, and enough allowance is provided for the structural design of the back focal section.
In the present invention, the abbe number v5 of the fifth lens 5 and the abbe number v6 of the sixth lens 6 satisfy the relation: and the absolute value of v5-v6 is more than or equal to 25 and less than or equal to 45. The chromatic aberration can be effectively corrected by meeting the relation, and the reasonable balance of chromatic aberration is achieved.
According to the ultra-wide angle lens, the first lens 1 and/or the fourth lens 4 are/is low-dispersion glass lenses, and the Abbe number VD is more than or equal to 60. That is, at least one of the spherical glass lenses in the super wide angle lens of the present invention is a low dispersion glass lens. The arrangement of the low-dispersion glass is beneficial to correcting chromatic aberration and secondary spectrum chromatic aberration, reducing infrared defocus and improving resolution in visible light and infrared light states.
The total length of the optical system of the ultra-wide angle lens is smaller than 12mm, so that the ultra-wide angle lens is small in size and convenient to install and debug.
In the ultra-wide angle lens of the present invention, the second lens 2, the third lens 3, the fifth lens 5 and the sixth lens 6 are plastic aspherical lenses, and all aspherical surfaces should satisfy an aspherical equation ：Z＝cy2/{1+[1-(1+k)c2y2]1/2}+a4y4+a6y6+a8y8+a10y10+a12y12+a14y14,, wherein the parameter c is a curvature corresponding to a radius of the aspherical lens, and y is a radial coordinate of the aspherical lens, and the unit of the curvature is the same as that of the lens length. k is the conic coefficient of the aspherical lens. a 4,a6、a8、a10、a12、a14 are the corresponding order coefficients of the aspherical surfaces, respectively.
The following are five sets of embodiments given for the material variation of each lens in the ultra-wide angle lens according to the present invention, and the differences of each relevant parameter are given to specifically explain the ultra-wide angle lens according to the present invention. According to the above embodiment of the present invention, the ultra-wide angle lens of the present invention includes six lenses in total, and a diaphragm is provided between the third lens 3 and the fourth lens 4. That is, the ultra-wide angle lens of the present invention has 13 optical surfaces, and a total of 16 optical surfaces, including an imaging surface and a flat glass surface of the imaging surface, which are sequentially arranged in the order of the structure of the present invention, and for convenience of description, the numbers are S1 to S16 according to the number of the optical surfaces.
The data in the five sets of examples are shown in table 1 below:
| conditional expression | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| 1.2≤f4/f≤2.8 | 2.746 | 1.990 | 2.200 | 1.203 | 1.172 |
| 1.2≤f2/f1≤3 | 2.001 | 1.201 | 1.607 | 2.501 | 2.969 |
| -1.8≤f5/f6≤-0.5 | -0.521 | -0.849 | -0.801 | -1.197 | -1.794 |
| 4.5≤dt/f≤6.5 | 5.952 | 4.509 | 6.011 | 5.009 | 6.487 |
| 0.3≤f/db≤1.2 | 0.527 | 1.188 | 0.315 | 0.801 | 0.779 |
| 25≤|v5-v6|≤45 | 32.546 | 25.368 | 36.047 | 44.993 | 35.184 |
TABLE 1
As can be seen from table 1, the settings of the parameters in the lenses according to the five groups of embodiments of the present invention satisfy the requirements of the ultra-wide angle lens of the present invention for the parameters.
As shown in fig. 1, in the present embodiment, the ultra-wide angle lens of the present invention includes six lenses. The total length of the optical system of the lens is ttl= 11.563mm, the focal length f= 2.278mm of the lens, the first lens 1 and the fourth lens 4 are low-dispersion lenses, the refractive indexes are vd=70.1, and vd=72.8 respectively.
Table 2 below lists relevant parameters for each lens, including surface type, radius of curvature, thickness, material (refractive index/abbe number):
| Sequence number | Surface type | Radius of curvature | Thickness of (L) | Refractive index | Abbe number |
| S1 | Spherical surface | 12.420 | 0.499 | 1.57 | 70.1 |
| S2 | Spherical surface | 2.424 | 1.082 | ||
| S3 | Aspherical surface | 6.000 | 0.499 | 1.52 | 54.1 |
| S4 | Aspherical surface | 2.920 | 0.613 | ||
| S5 | Aspherical surface | -3.404 | 1.212 | 1.68 | 22.4 |
| S6 | Aspherical surface | -3.174 | 0.656 | ||
| S7 (diaphragm) | Spherical surface | Infinity | 0.102 | ||
| S8 | Spherical surface | 12.935 | 0.999 | 1.52 | 72.8 |
| S9 | Spherical surface | -4.923 | 0.101 | ||
| S10 | Aspherical surface | 5.965 | 0.999 | ||
| S11 | Aspherical surface | -1.953 | 0.089 | 1.55 | 58.5 |
| S12 | Aspherical surface | -2.297 | 0.398 | ||
| S13 | Aspherical surface | -6.031 | 2.996 | 1.70 | 26.0 |
| S14 (glass) | Spherical surface | Infinity | 0.700 | ||
| S15 | Spherical surface | Infinity | 0.620 | ||
| S16 (imaging surface) |
TABLE 2
Table 3 below lists the individual aspherical coefficients:
TABLE 3 Table 3
As can be seen from tables 1, 2 and 3, in the present embodiment, the settings of the parameters related to each lens satisfy the requirements of the ultra-wide angle lens of the present invention. Fig. 2 to 6 are graphs schematically showing MTF patterns in a normal-temperature visible light band, MTF patterns in a normal-temperature infrared light band, defocus curves at normal temperature, defocus curves at-40 ℃ at low temperature, and defocus curves at 80 ℃ at high temperature, respectively, of the ultra-wide-angle lens according to embodiment 1 of the present invention. As can be seen from fig. 2 to fig. 6, the ultra-wide angle lens of the present invention is arranged according to the relevant parameters of each lens in embodiment 1, so that the maximum field angle of the optical system of the present invention can reach 220 °, the resolution can reach more than 500 ten thousand, the confocal between visible light and infrared can be realized, and at the same time, the lens can ensure the same resolution as that in the normal temperature state without refocusing under the environmental temperature change of-40 ℃ to 80 ℃, and has good performance.
Fig. 7 is a block diagram schematically showing an ultra-wide angle lens according to embodiment 2 of the present invention. As shown in fig. 7, in the present embodiment, the ultra-wide angle lens of the present invention includes six lenses. The total optical system length ttl= 11.272mm of the lens, the focal length f=2.500 mm of the lens, the first lens 1 and the fourth lens 4 are low dispersion glass lenses, and the refractive indexes are 71.7 and 69.2, respectively.
Table 4 below lists relevant parameters for each lens, including surface type, radius of curvature, thickness, material (refractive index/abbe number):
TABLE 4 Table 4
Table 5 below lists the individual aspherical coefficients:
| K | a4 | a6 | a8 | a10 | a12 | a14 | |
| S3 | 0.000 | -1.455E-02 | 1.117E-04 | 2.661E-05 | 1.281E-05 | 1.281E-05 | 0 |
| S4 | 1.680 | -1.827E-02 | 7.228E-04 | -3.848E-04 | -1.755E-04 | -1.755E-04 | 0 |
| S5 | 5.461 | 3.883E-03 | 4.936E-04 | 2.442E-04 | 2.555E-04 | 2.555E-04 | 0 |
| S6 | -2.773 | -6.367E-03 | 7.673E-04 | 1.052E-04 | 8.274E-05 | 8.274E-05 | 0 |
| S10 | -5.823 | 5.889E-03 | 1.366E-03 | -4.143E-03 | 2.234E-05 | 2.234E-05 | 0 |
| S11 | -2.128 | -1.312E-02 | -3.160E-03 | -3.057E-04 | 5.389E-05 | 5.389E-05 | 0 |
| S12 | -1.485 | 1.803E-02 | -2.095E-03 | 2.936E-03 | -1.420E-04 | -1.420E-04 | 0 |
| S13 | 12.296 | 1.894E-02 | 1.967E-03 | 1.343E-03 | -1.905E-04 | -1.905E-04 | 0 |
TABLE 5
As can be seen from tables 1, 4 and 5, in the present embodiment, the settings of the parameters related to each lens satisfy the condition requirements of the ultra-wide angle lens of the present invention. Fig. 8 to 12 are graphs schematically showing MTF patterns in a normal-temperature visible light band, MTF patterns in a normal-temperature infrared light band, defocus curves at normal temperature, defocus curves at-40 ℃ at low temperature, and defocus curves at 80 ℃ at high temperature, respectively, of the ultra-wide-angle lens according to embodiment 2 of the present invention. As can be seen from fig. 8 to fig. 12, the ultra-wide angle lens of the present invention is arranged according to the relevant parameters of each lens in embodiment 2, so that the maximum field angle of the optical system of the present invention can reach 220 °, the resolution can reach more than 500 ten thousand, the confocal between visible light and infrared light can be realized, and at the same time, the lens can ensure the same resolution as that in the normal temperature state without refocusing under the environmental temperature change of-40 ℃ to 80 ℃, and has good performance.
Fig. 13 is a block diagram schematically showing an ultra-wide angle lens according to embodiment 3 of the present invention. As shown in fig. 13, in the present embodiment, the ultra-wide angle lens of the present invention includes six lenses. The total optical system length ttl= 11.890mm of the lens, the focal length f= 1.892mm of the lens, the first lens 1 and the fourth lens 4 are low dispersion glass lenses, and the refractive indexes are 64.2 and 69.9, respectively.
Table 6 below lists relevant parameters for each lens, including surface type, radius of curvature, thickness, material (refractive index/abbe number):
TABLE 6
Table 7 below lists the individual aspherical coefficients:
| Surf | k | a4 | a6 | a8 | a10 | a12 | a14 |
| S3 | -18.916 | -1.529E-02 | 2.273E-03 | -8.607E-05 | 0 | 0 | 0 |
| S4 | 1.475 | -4.488E-02 | 9.674E-03 | -1.937E-03 | 0 | 0 | 0 |
| S5 | 1.442 | 4.686E-03 | 3.013E-03 | 5.830E-04 | 0 | 0 | 0 |
| S6 | -3.727 | 1.712E-03 | 2.628E-03 | 5.026E-05 | 0 | 0 | 0 |
| S10 | -7.977 | 1.383E-03 | -4.011E-03 | -5.997E-03 | 0 | 0 | 0 |
| S11 | -0.763 | -1.825E-02 | 1.717E-03 | -1.682E-03 | 0 | 0 | 0 |
| S12 | -3.138 | 3.655E-02 | -7.704E-03 | 2.228E-03 | 0 | 0 | 0 |
| S13 | -9.903 | 8.912E-02 | -1.139E-02 | 1.797E-03 | 0 | 0 | 0 |
TABLE 7
As can be seen from tables 1, 6 and 7, in the present embodiment, the settings of the parameters related to each lens satisfy the requirements of the ultra-wide angle lens of the present invention. Fig. 14 to 18 are graphs schematically showing MTF patterns in a normal-temperature visible light band, MTF patterns in a normal-temperature infrared light band, defocus curves at normal temperature, defocus curves at-40 ℃ at low temperature, and defocus curves at 80 ℃ at high temperature, respectively, of the ultra-wide-angle lens according to embodiment 3 of the present invention. As can be seen from fig. 14 to fig. 18, the ultra-wide angle lens of the present invention is arranged according to the relevant parameters of each lens in embodiment 3, so that the maximum field angle of the optical system of the present invention can reach 220 °, the resolution can reach more than 500 ten thousand, the confocal between visible light and infrared light can be realized, and at the same time, the lens can ensure the same resolution as that in the normal temperature state without refocusing under the environmental temperature change of-40 ℃ to 80 ℃, and has good performance.
Fig. 19 is a block diagram schematically showing an ultra-wide angle lens according to embodiment 4 of the present invention. As shown in fig. 19, in the present embodiment, the ultra-wide angle lens of the present invention includes six lenses. The total optical system length ttl= 10.895mm of the lens, the focal length f=2.175 mm of the lens, the fourth lens 4 is a low dispersion glass lens, and the refractive index is 68.8.
Table 8 below lists relevant parameters for each lens, including surface type, radius of curvature, thickness, material (refractive index/abbe number):
TABLE 8
Table 9 below lists the individual aspherical coefficients:
| Surf | K | a4 | a6 | a8 | a10 | a12 | a14 |
| S3 | -2.134 | -1.13E+00 | -3.37E-02 | -9.51E-03 | 2.96E-03 | -2.73E-04 | 0 |
| S4 | -1.974 | -1.97E+00 | 3.76E-02 | -1.91E-02 | 4.91E-03 | 5.83E-04 | 0 |
| S5 | 10.759 | 1.06E+01 | -9.96E-03 | 2.96E-03 | -3.51E-03 | 1.86E-04 | 0 |
| S6 | 4.043 | 4.04E+00 | 7.62E-03 | -6.04E-04 | 4.80E-03 | 7.39E-06 | 0 |
| S10 | 22.686 | 2.27E+01 | -6.92E-02 | 5.71E-02 | -5.56E-02 | 2.59E-02 | 0 |
| S11 | -8.927 | -8.93E+00 | 2.78E-02 | -6.21E-03 | -4.68E-03 | 2.97E-03 | 0 |
| S12 | -13.206 | -1.52E+01 | 6.92E-03 | 1.11E-03 | -4.22E-04 | 6.24E-05 | 0 |
| S13 | -1.897 | -1.90E+00 | -2.04E-02 | 5.30E-03 | -2.03E-03 | 9.53E-04 | 0 |
TABLE 9
As can be seen from tables 1, 8 and 9, in the present embodiment, the settings of the parameters related to each lens satisfy the condition requirements of the ultra-wide angle lens of the present invention. Fig. 20 to 24 are graphs schematically showing MTF patterns in a normal-temperature visible light band, MTF patterns in a normal-temperature infrared light band, defocus curves at normal temperature, defocus curves at-40 ℃ at low temperature, and defocus curves at 80 ℃ at high temperature, respectively, of the ultra-wide-angle lens according to embodiment 4 of the present invention. As can be seen from fig. 20 to 24, the ultra-wide angle lens of the present invention is arranged according to the relevant parameters of each lens in embodiment 4, so that the maximum field angle of the optical system of the present invention can reach 220 °, the resolution can reach more than 500 ten thousand, the confocal between visible light and infrared light can be realized, and meanwhile, under the environmental temperature change of-40 ℃ to 80 ℃, the lens can ensure the same resolution as that in the normal temperature state without refocusing, and has good performance.
Fig. 25 is a block diagram schematically showing an ultra-wide angle lens according to embodiment 5 of the present invention. As shown in fig. 25, in the present embodiment, the ultra-wide angle lens of the present invention includes six lenses. The total optical system length ttl= 11.994mm of the lens, the focal length f=1.848 mm of the lens, the fourth lens 4 is a low dispersion glass optic, and the refractive index is 62.9.
Table 10 below lists relevant parameters for each lens, including surface type, radius of curvature, thickness, material (refractive index/abbe number):
Table 10
Table 11 below lists the individual aspherical coefficients:
| k | a4 | a6 | a8 | a10 | a12 | a14 | |
| S3 | -1.053 | -3.15E-02 | -1.01E-02 | 2.81E-03 | -3.16E-04 | -2.91E-06 | 2.96E-06 |
| S4 | -1.869 | 3.54E-02 | -1.64E-02 | 7.20E-03 | 1.68E-03 | -1.52E-04 | -2.07E-04 |
| S5 | 10.246 | -6.02E-03 | 5.88E-03 | -2.10E-03 | 8.75E-04 | 2.62E-05 | 3.30E-04 |
| S6 | 6.235 | 1.43E-04 | -7.78E-04 | 4.88E-03 | 3.25E-04 | 2.46E-04 | 2.74E-04 |
| S10 | -36.641 | -7.64E-02 | 4.63E-02 | -6.24E-02 | 2.40E-02 | -4.61E-03 | 4.07E-04 |
| S11 | -9.773 | 1.78E-02 | -8.14E-03 | -4.30E-03 | 3.09E-03 | -6.19E-04 | -9.59E-05 |
| S12 | -8.811 | 7.90E-03 | 1.15E-03 | -6.07E-04 | -1.95E-05 | -4.16E-05 | 4.69E-07 |
| S13 | 2.114 | -2.63E-02 | 6.76E-03 | -1.79E-03 | 9.12E-04 | -1.95E-04 | -1.77E-05 |
TABLE 11
As can be seen from table 1, table 10 and table 11, in the present embodiment, the settings of the respective lens related parameters satisfy the condition requirements of the ultra-wide angle lens of the present invention. Fig. 26 to 30 are graphs schematically showing MTF at normal temperature visible light band, MTF at normal temperature infrared light band, defocus at normal temperature, defocus at-40 c, and defocus at 80 c, respectively, of the ultra-wide angle lens according to example 4 of the present invention. As can be seen from fig. 26 to fig. 30, the ultra-wide angle lens of the present invention is arranged according to the relevant parameters of each lens in embodiment 5, so that the maximum field angle of the optical system of the present invention can reach 220 °, the resolution can reach more than 500 ten thousand, the confocal between visible light and infrared light can be realized, and meanwhile, under the environmental temperature change of-40 ℃ to 80 ℃, the lens can ensure the same resolution as that in the normal temperature state without refocusing, and has good performance.
The foregoing is merely exemplary of embodiments of the invention and, as regards devices and arrangements not explicitly described in this disclosure, it should be understood that this can be done by general purpose devices and methods known in the art.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. An ultra-wide angle lens comprises a first lens (1) with negative focal power, a second lens (2) with negative focal power, a third lens (3) with positive focal power, a fourth lens (4) with positive focal power, a fifth lens (5) and a sixth lens (6) with opposite focal power, which are sequentially arranged from an object side to an image side along an optical axis;
The focal length f of the ultra-wide angle lens and the focal length f4 of the fourth lens (4) satisfy the relation: f4/f is more than or equal to 1.2 and less than or equal to 2.8;
the focal length f of the ultra-wide angle lens and the distance dt from the object side surface to the image side surface of the first lens (1) satisfy the following relation: dt/f is more than or equal to 4.5 and less than or equal to 6.5.
2. Ultra-wide angle lens according to claim 1, characterized in that the first lens (1) and the fourth lens (4) are glass spherical lenses;
the second lens (2), the third lens (3), the fifth lens (5) and the sixth lens (6) are plastic aspherical lenses.
3. The ultra-wide angle lens according to claim 2, wherein the first lens element (1) and the second lens element (2) are convex on the object side and concave on the image side along the optical axis from the object side to the image side;
The object side surface of the third lens (3) is a concave surface, and the image side surface is a convex surface;
the object side surface and the image side surface of the fourth lens (4) are both convex surfaces.
4. A super wide angle lens according to any one of claims 1-3, characterized in that the relation between the focal length f1 of the first lens (1) and the focal length f2 of the second lens (2) is satisfied: f2/f1 is less than or equal to 1.2 and less than or equal to 3.
5. A super wide angle lens as claimed in any one of claims 1-3, characterized in that the relation between the focal length f5 of the fifth lens (5) and the focal length f6 of the sixth lens (6) is satisfied: -1.8.ltoreq.f5/f6.ltoreq.0.5.
6. A super wide angle lens as claimed in any one of claims 1 to 3, wherein the focal length f of the super wide angle lens and the object side to image side distance db of the sixth lens element (6) satisfy the relationship: f/db is more than or equal to 0.3 and less than or equal to 1.2.
7. A super wide angle lens according to any one of claims 1-3, characterized in that the abbe number v5 of the fifth lens (5) and the abbe number v6 of the sixth lens (6) satisfy the relation: and the absolute value of v5-v6 is more than or equal to 25 and less than or equal to 45.
8. A super wide angle lens according to any one of claims 1-3, characterized in that the first lens (1) and/or the fourth lens (4) is a low dispersion glass lens and the abbe number VD of the low dispersion glass is not less than 60.
9. A super wide angle lens as claimed in any one of claims 1 to 3, wherein the total optical length of the super wide angle lens is less than 12mm.
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| CN112698474B (en) * | 2019-10-23 | 2022-03-22 | 深圳长城开发科技股份有限公司 | Ultra-wide angle lens |
| WO2021217446A1 (en) * | 2020-04-28 | 2021-11-04 | 天津欧菲光电有限公司 | Optical system, camera module, electronic device and vehicle |
| CN113885181A (en) * | 2021-11-05 | 2022-01-04 | 舜宇光学(中山)有限公司 | Fixed focal length lens |
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| CN106483633A (en) * | 2015-08-27 | 2017-03-08 | 先进光电科技股份有限公司 | Optical imaging system |
| CN209028285U (en) * | 2018-11-05 | 2019-06-25 | 舜宇光学(中山)有限公司 | Bugeye lens |
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| CN209028285U (en) * | 2018-11-05 | 2019-06-25 | 舜宇光学(中山)有限公司 | Bugeye lens |
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