CN217060612U - Small ultra-wide-angle, high-pixel and low-distortion fixed-focus lens and camera - Google Patents
Small ultra-wide-angle, high-pixel and low-distortion fixed-focus lens and camera Download PDFInfo
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- CN217060612U CN217060612U CN202220537031.0U CN202220537031U CN217060612U CN 217060612 U CN217060612 U CN 217060612U CN 202220537031 U CN202220537031 U CN 202220537031U CN 217060612 U CN217060612 U CN 217060612U
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Abstract
The utility model discloses a small-size super wide angle, high pixel, low distortion prime lens and camera, prime lens include from the thing side to picture side in proper order: a first lens group with negative focal power and a second lens group with positive focal power; the first lens group comprises at least 2 negative focal power lenses and at least 1 positive focal power lens; wherein, in the negative focal power lens included in the first lens group, at least 1 aspheric lens is provided; the second lens group comprises at least 2 negative focal power lenses and at least 3 positive focal power lenses; the second lens group comprises at least 1 group of combined lenses, and the combined lenses are combined lenses of 1 negative focal power lens included in the second lens group and 1 positive focal power lens included in the second lens group; in addition, at least 2 aspheric lenses are provided in the positive power lenses included in the second lens group.
Description
Technical Field
The utility model relates to a camera lens technical field, in particular to small-size super wide angle, high pixel, low distortion tight shot and camera.
Background
In recent years, with the rapid development of the network data transmission industry, the demands of consumer electronics products such as intelligent monitoring, unmanned aerial vehicle shooting, video conferencing, distance education, indoor AI products and the like are increasingly expanded, and the research and development of ultra-wide-angle, large-target-surface, high-pixel and low-distortion lenses are trending.
Similar mainstream shots in the market today have the following disadvantages: the field range is small; the optical distortion is large, resulting in scene distortion; the lens is large in volume; the resolution is low, and the current mainstream uses chips with 200-500 ten thousand pixels, so that the resolution of part of scenes is insufficient and cannot be clearly distinguished; the imaging target surface is small; the existing ultra-wide-angle, large-target-surface, high-pixel and low-distortion lens is far from enough for use scenes with higher requirements.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a small-size super wide angle, high pixel, low distortion tight shot and camera to solve one or more technical problem that exist among the prior art, provide a profitable selection or create the condition at least.
The utility model provides a solution of its technical problem provides a small-size super wide angle, high pixel, low distortion prime lens, includes from the thing side to the picture side in proper order: a first lens group with negative focal power and a second lens group with positive focal power;
the first lens group comprises at least 2 negative focal power lenses and at least 1 positive focal power lens; wherein, in the negative focal power lens included in the first lens group, at least 1 aspheric lens is provided;
the second lens group comprises at least 2 negative focal power lenses and at least 3 positive focal power lenses; the second lens group comprises at least 1 group of combined lenses, and the combined lenses are combined lenses of 1 negative focal power lens included in the second lens group and 1 positive focal power lens included in the second lens group; in addition, at least 2 aspheric lenses are included in the positive power lenses included in the second lens group.
Further, the small ultra-wide-angle, high-pixel and low-distortion fixed-focus lens meets the following conditions:
1.5<|f1x/fw|<2.5；
0.9<|f2x/fw|<2.0；
0.9<|f2/fw|<2.5；
wherein fw is a focal length of the small ultra-wide-angle, high-pixel and low-distortion fixed-focus lens when the small ultra-wide-angle, high-pixel and low-distortion fixed-focus lens is focused at an infinite position;
f1x is the focal length of any one of the first 3 lenses of the first lens group from the object side of the small ultra-wide-angle, high-pixel and low-distortion prime lens;
f2x is the focal length of any one of the first 3 lenses of the second lens group from the object side of the small ultra-wide-angle, high-pixel and low-distortion prime lens;
f2 is the composite focal length of the second lens group of the small ultra-wide-angle, high-pixel and low-distortion fixed-focus lens.
Further, the small ultra-wide-angle, high-pixel and low-distortion fixed-focus lens meets the following conditions:
31.8≦VdG1≦52.77；
56.60≦VdG2≦75.5；
wherein VdG1 is the abbe number average value of the d line of the negative power lens in the first lens group, VdG2 is the abbe number average value of the d line of the positive power lens in the second lens group.
Further, the small-sized ultra-wide-angle, high-pixel and low-distortion fixed-focus lens meets the following conditions:
2.15<Ttl/(tanω*fw)<3.0；
wherein, Ttl is the total optical length of the small ultra-wide-angle, high-pixel and low-distortion fixed-focus lens;
omega is the maximum incident angle of the small-sized super-wide-angle, high-pixel and low-distortion fixed-focus lens; and fw is the focal length of the small-sized ultra-wide-angle, high-pixel and low-distortion fixed-focus lens when the small-sized ultra-wide-angle, high-pixel and low-distortion fixed-focus lens is focused at an infinite position.
Further, the small-sized ultra-wide-angle, high-pixel and low-distortion fixed-focus lens meets the following conditions:
Ymax/tanω/fw>0.85；
wherein, omega is the maximum incident angle of the small-sized super-wide-angle, high-pixel and low-distortion fixed-focus lens; ymax is the maximum real image height of the small ultra-wide-angle, high-pixel and low-distortion fixed-focus lens;
and fw is the focal length of the small ultra-wide-angle, high-pixel and low-distortion fixed-focus lens when the small ultra-wide-angle, high-pixel and low-distortion fixed-focus lens is focused at an infinite position.
Further, small-size super wide angle, high pixel, low distortion tight shot still include: an aperture stop located between the first lens group and the second lens group.
Further, the first lens group includes: the lens comprises a negative focal power meniscus first lens, a negative focal power meniscus second lens, a positive focal power third lens and a positive focal power meniscus fourth lens; wherein the second lens and the fourth lens are aspheric lenses;
the second lens group includes: a double convex fifth lens with positive focal power, a double concave sixth lens with negative focal power, a double convex seventh lens with positive focal power, a meniscus eighth lens with negative focal power, a meniscus ninth lens with positive focal power and a reverse curved tenth lens with positive focal power; wherein the fifth lens, the ninth lens and the tenth lens are aspheric lenses, and the seventh lens and the eighth lens are combined lenses.
Further, the first lens group includes: the lens comprises a negative focal power meniscus first lens, a negative focal power meniscus second lens, a positive focal power third lens and a negative focal power meniscus fourth lens; wherein the second lens and the fourth lens are aspheric lenses;
the second lens group includes: a biconvex fifth lens with positive focal power, a sixth lens with positive focal power, a crescent seventh lens with negative focal power, a crescent eighth lens with positive focal power, a crescent ninth lens with negative focal power and a sigmoidal tenth lens with positive focal power; wherein the fifth lens, the ninth lens and the tenth lens are aspheric lenses, and the sixth lens and the seventh lens are combined lenses.
The utility model also provides a camera, include: the small ultra-wide-angle, high-pixel and low-distortion fixed-focus lens is disclosed.
The beneficial effects of the utility model are that: the distortion of the lens is smaller than that of the lens in the current market, the TV distortion is realized by more than-4%, and low distortion is realized; meanwhile, the imaging target surface greatly exceeds 1/2.7 'and 1/1.7' used in the current mainstream market, and reaches 1 inch, so that an ultra-wide angle is realized; the size of the lens can be equal to that of the lenses of 1/2.7 'and 1/1.7' in the existing mainstream markets, and miniaturization is realized; and the optical group meeting the characteristics can correct various aberrations well to obtain an optical system with excellent performance, the resolution ratio reaches 2000 ten thousand, and the effect of high pixel is achieved.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a compact ultra-wide angle, high pixel, low distortion fixed focus lens of the present invention;
FIG. 2 is an aberration diagram of spherical aberration, astigmatism, and distortion for the embodiment of FIG. 1;
FIG. 3 is a coma diagram of the embodiment of FIG. 1;
FIG. 4 is a schematic diagram of another embodiment of a compact ultra-wide angle, high pixel, low distortion fixed focus lens of the present invention;
FIG. 5 is a diagram of spherical aberration, astigmatism, and distortion for the embodiment of FIG. 4;
fig. 6 is a coma diagram of the embodiment of fig. 4.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not to be construed as limiting the invention.
It should be understood that in the description of the embodiments of the present invention, a plurality (or a plurality) is/are two or more, and more, less, more, etc. are understood as excluding the number, and more, less, more, etc. are understood as including the number. If the description of "first", "second", etc. is used for the purpose of distinguishing technical features, it is not intended to indicate or imply relative importance or to implicitly indicate the number of indicated technical features or to implicitly indicate the precedence of the indicated technical features.
It should be noted that although the functional modules are divided in the schematic diagram, in some cases, the functional modules may be divided differently from the modules in the system.
In the description of the present invention, unless there is an explicit limitation, the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the above terms in combination with the specific content of the technical solution in the present invention.
In some embodiments of the present invention, a compact ultra-wide angle, high pixel, low distortion fixed focus lens includes, in order from an object side to an image side: a first lens group with negative focal power and a second lens group with positive focal power;
the first lens group comprises at least 2 negative focal power lenses and at least 1 positive focal power lens; wherein, in the negative focal power lens included in the first lens group, at least 1 aspheric lens;
the second lens group comprises at least 2 negative focal power lenses and at least 3 positive focal power lenses; the second lens group comprises at least 1 group of combined lenses, and the combined lenses are combined lenses of 1 negative focal power lens included in the second lens group and 1 positive focal power lens included in the second lens group; in addition, the second lens group includes at least 2 aspherical lenses among the positive power lenses.
The lens group includes a positive power lens and a negative power lens; the first lens group is provided with a plurality of combinations of positive focal power lenses and negative focal power lenses, and the combinations of the first lens group comprise at least 2 negative focal power lenses and at least 1 positive focal power lens; specific combinations of the first lens group are, for example: the first lens group comprises 2 negative focal power lenses and 1 positive focal power lens, the first lens group comprises 2 negative focal power lenses and 2 positive focal power lenses, the first lens group comprises 3 negative focal power lenses and 1 positive focal power lens, and the first lens group comprises 4 negative focal power lenses and 5 positive focal power lenses;
similarly, the second lens group is provided with a plurality of combinations of positive focal power lenses and negative focal power lenses, and the combinations of the second lens group comprise at least 2 negative focal power lenses and at least 3 positive focal power lenses; specific combinations of the second lens group are, for example: the second lens group comprises 2 negative focal power lenses and 3 positive focal power lenses, the second lens group comprises 3 negative focal power lenses and 3 positive focal power lenses, the second lens group comprises 2 negative focal power lenses and 4 positive focal power lenses, and the second lens group comprises 5 negative focal power lenses and 4 positive focal power lenses;
it should be noted that, the combined lens herein refers to a combined lens formed by joining 1 positive focal power lens and 1 negative focal power lens; the lens comprises a positive focal power lens and a negative focal power lens, light rays have a converging effect when passing through the positive focal power lens, and have a diverging effect when passing through the negative focal power lens, and the lens achieves an imaging effect through the combination of the positive focal power lens and the negative focal power lens.
In some embodiments of the present invention, the small ultra-wide angle, high pixel, low distortion fixed focus lens satisfies the following conditions:
1.5<|f1x/fw|<2.5； (1)
0.9<|f2x/fw|<2.0； (2)
0.9<|f2/fw|<2.5； (3)
wherein fw is the focal length of the small-sized super-wide-angle, high-pixel and low-distortion fixed-focus lens when the lens is focused at an infinite position;
f1x is the focal length of any one of the first 3 lenses of the first lens group from the object side of the small super-wide-angle, high-pixel and low-distortion fixed-focus lens;
f2x is the focal length of any one of the first 3 lenses of the second lens group from the object side of the small super-wide-angle, high-pixel and low-distortion fixed-focus lens;
f2 is the composite focal length of the second lens group of the small ultra-wide-angle, high-pixel and low-distortion fixed-focus lens;
the conditional expression (1) specifies the focal power of the first 3 lenses from the object side of the first lens group, and when the conditional expression (1) exceeds the upper limit, the focal power becomes weak, so that the lenses of the first lens group become large to ensure the imaging effect, the length of the whole lens also becomes large, and the miniaturization is not favorable; on the other hand, if conditional expression (1) exceeds the lower limit, the refractive power becomes strong, which is advantageous for downsizing the lens, but the negative distortion generated thereby also increases, which makes correction difficult, and is disadvantageous for low distortion; in summary, the conditional expression (1) balances miniaturization and low distortion;
the conditional expressions (2) and (3) prescribe the focal powers of the first 3 lenses of the second lens group from the object side and the focal power of the whole second lens group, and satisfying the conditional expressions (2) and (3) is beneficial to the miniaturization of the lens and the good correction of aberrations such as spherical aberration, coma aberration and the like; if the conditional expression (2) or (3) exceeds the upper limit, the focal power becomes weak, which is advantageous for reducing the aberration and sensitivity of the lens, but is disadvantageous for shortening the length of the lens and is disadvantageous for downsizing; on the contrary, if the conditional expression (2) or (3) exceeds the lower limit, the focal power becomes strong, which is advantageous for the miniaturization of the lens, but the focal power becomes strong, the spherical aberration, astigmatism, and coma aberration become large accordingly, the sensitivity of the lens also becomes large, the correction becomes difficult, and the resolution and yield of the lens are adversely affected; in summary, conditional expressions (2) and (3) balance miniaturization, high pixel, and low distortion.
In some embodiments of the present invention, the small ultra-wide angle, high pixel, low distortion fixed focus lens satisfies the following conditions:
31.8≦VdG1≦52.77； (4)
56.60≦VdG2≦75.5； (5)
wherein VdG1 is the abbe number average of the d-line of the negative power lens in the first lens group, VdG2 is the abbe number average of the d-line of the positive power lens in the second lens group;
the conditional expression (4) specifies the abbe number of the material used for the negative-power lens in the first lens group. When the conditional expression (4) exceeds the upper limit, the refractive index of the corresponding glass material is reduced, so that the lens has stronger curvature, spherical aberration and larger astigmatism are caused, and larger negative optical distortion is caused, and the correction is difficult; on the contrary, when the conditional expression (4) exceeds the lower limit, the refractive index of the material used correspondingly increases, and the corresponding portion is less dispersed, so that the on-axis chromatic aberration and the magnification chromatic aberration are difficult to correct;
the conditional expression (5) specifies the abbe number of the material for use in the positive power lens in the second lens group, so that the relatively reasonable low-dispersion material is used to achieve chromatic aberration, chromatic aberration of magnification, and good correction of aberration. When the conditional expression (5) exceeds the upper limit, the refractive index of the corresponding glass material is changed to be very small, so that the obtained lens has stronger curvature, and spherical aberration is over-corrected, astigmatism and coma aberration are difficult to correct; on the contrary, when the conditional expression (5) exceeds the lower limit, the refractive index of the corresponding glass material increases, and the corresponding portion is less dispersed, so that the on-axis chromatic aberration and the magnification chromatic aberration are difficult to correct;
it should be noted that the d-line represents a green characteristic line among dark characteristic lines in the solar spectrum drawn for fraunhofer.
In some embodiments of the present invention, the small ultra-wide angle, high pixel, low distortion fixed focus lens satisfies the following conditions:
2.15<Ttl/(tanω*fw)<3.0； (6)
wherein, Ttl is the total optical length of the small-sized super-wide-angle, high-pixel and low-distortion fixed-focus lens;
omega is the maximum incident angle of the small-sized super-wide-angle, high-pixel and low-distortion fixed-focus lens;
fw is the focal length of the small ultra-wide-angle, high-pixel and low-distortion fixed-focus lens when the lens is focused at an infinite position;
the conditional expression (6) specifies the correlation between the optical full length and the maximum field of view of photography; the conditional expression (6) has an excessively large optical total length, which makes it difficult to miniaturize the lens; on the other hand, if the conditional expression (6) exceeds the lower limit, the focal power of each group becomes strong, and various aberrations that occur are difficult to correct.
In some embodiments of the present invention, the small ultra-wide angle, high pixel, low distortion fixed focus lens satisfies the following conditions:
Ymax/tanω/fw>0.85； (7)
wherein, omega is the maximum incident angle of the small-sized super-wide-angle, high-pixel and low-distortion fixed-focus lens; ymax is the maximum real image height of the small ultra-wide-angle, high-pixel and low-distortion fixed-focus lens;
fw is the focal length of the small-sized super-wide-angle, high-pixel and low-distortion fixed-focus lens when the lens is focused at an infinite position;
the conditional expression (7) specifies the correlation between the target surface size and the maximum angle of view for limiting the distortion of the optical system; when the amount is outside the range of the conditional expression (7), the optical distortion amount is relatively significant.
In some embodiments of the present invention, the small ultra-wide angle, high pixel, low distortion fixed focus lens further comprises: and the aperture diaphragm is positioned between the first lens group and the second lens group.
Referring to fig. 1, in some embodiments of the present invention, a compact ultra-wide angle, high pixel, low distortion fixed focus lens includes, in order from an object side to an image side: a first lens group G1 of negative power and a second lens group G2 of positive power;
the first lens group G1 includes: a negative-power meniscus first lens L11, a negative-power meniscus second lens L12, a positive-power meniscus third lens L13, and a positive-power meniscus fourth lens L14; the second lens L12 and the fourth lens L14 are aspheric lenses;
the second lens group G2 includes: a positive double-convex fifth lens L21, a negative double-concave sixth lens L22, a positive double-convex seventh lens L23, a negative meniscus eighth lens L24, a positive meniscus ninth lens L25, a positive retroflective tenth lens L26; the fifth lens L21, the ninth lens L25, and the tenth lens L26 are aspheric lenses, and the seventh lens L23 having positive power and the eighth lens L24 having negative power are combined lenses.
Referring to fig. 1, the specific parameters of the small ultra-wide-angle, high-pixel, low-distortion fixed-focus lens described in this embodiment are as follows: the focal length f is 5.04mm, the lens aperture value Fno is 2.47, the field angle ω of the lens is 60.8 °, table 1 shows the radius of curvature r (mm), the distance d (mm), the refractive index Nd, and the abbe number ABV of each lens surface from the object side of the compact super wide-angle, high-pixel, low-distortion fixed-focus lens described in this embodiment;
TABLE 1
| NO | R | | Nd | ABV | |
| 1 | 12.9427 | 0.8 | 1.76232 | 35.71 | |
| 2 | 5.1771 | 0.9656 | |||
| 3 | 3.9521 | 0.8 | 1.53732 | 55.71 | |
| 4 | 2.631 | 2.1401 | |||
| 5 | 11.5346 | 2.3816 | 2.00912 | 29.13 | |
| 6 | -192.7476 | 1.061 | |||
| 7 | -6.8343 | 2 | 1.88621 | 40.14 | |
| 8 | -7.878 | 0.1 | |||
| 9 | inf | 0.1 | |||
| 10 | 5.4217 | 1.85 | 1.49856 | 81.56 | |
| 11 | -4.5011 | 0.5916 | |||
| 12 | -12.6469 | 0.5 | 1.62067 | 49.81 | |
| 13 | 7.6403 | 0.1 | |||
| 14 | 7.4406 | 3 | 1.52381 | 81.1 | |
| 15 | -3.4 | 0.5 | 1.93024 | 23.96 | |
| 16 | -5.4395 | 0.2187 | |||
| 17 | -3.9445 | 1.2 | 1.71005 | 50.97 | |
| 18 | -4.845 | 0.15 | |||
| 19 | 4.5778 | 1.2414 | 1.88621 | 40.14 | |
| 20 | 4.654 | 1 | |||
| 21 | inf | 0.3 | 1.51872 | 64.2 | |
| 22 | inf | 2.398 | |||
| 23 | inf | 0.5 | 1.51872 | 64.2 | |
| 24 | inf | 0.1 |
And obtaining parameters of each aspheric surface according to the data and the aspheric surface formula in the table 2, and substituting the data in the table 2 into the aspheric surface formula to obtain the parameters of each aspheric lens.
TABLE 2
| NO | K | *4 | *6 | *8 | *10 | *12 |
| 3 | -5.48E+00 | 4.46E-03 | -3.12E-04 | 1.14E-05 | -2.46E-07 | 2.82E-09 |
| 4 | -2.52E+00 | 1.01E-02 | -6.64E-04 | 1.73E-05 | -1.32E-07 | 1.80E-09 |
| 7 | -5.49E-01 | 1.46E-04 | -3.87E-05 | 6.97E-06 | 4.91E-07 | -6.79E-08 |
| 8 | -2.53E+00 | -1.33E-04 | 2.14E-04 | -1.57E-05 | 2.76E-06 | 0.00E+00 |
| 10 | -1.55E+00 | -1.15E-03 | 1.01E-04 | -2.22E-05 | -4.89E-06 | -2.35E-09 |
| 11 | 0.00E+00 | -6.92E-04 | -1.88E-04 | 2.27E-05 | -4.79E-06 | -2.51E-07 |
| 17 | -6.72E+00 | -4.41E-04 | -1.54E-04 | 2.34E-05 | -1.17E-06 | 1.73E-08 |
| 18 | -5.83E+00 | -2.38E-03 | 1.97E-04 | -1.63E-06 | -3.11E-08 | 0.00E+00 |
| 19 | -5.95E+00 | -2.35E-03 | -2.51E-04 | 2.43E-05 | -1.00E-06 | 1.55E-08 |
| 20 | -7.43E-01 | -8.09E-03 | 2.59E-04 | -6.61E-06 | 8.21E-08 | -4.07E-10 |
It should be noted that the aspheric formula is as follows:
wherein, the first and the second end of the pipe are connected with each other,
in Table 2 ". 4" is AH 4 The values of the terms, ". 6" in Table 2 are BH 6 The values of the terms, ". about.8" in Table 2 are CH 8 Values of the terms, DH for ". 10" in Table 2 10 Values of the terms, ". 12" in Table 2 are EH 12 The value of the term.
Referring to FIG. 2, light having a wavelength of 656.2800nm is indicated by a straight line, light having a wavelength of 587.5600nm is indicated by a dotted line, and light having a wavelength of 435.8400nm is indicated by a dashed dotted line; from left to right, the spherical aberration for light of three wavelengths, the astigmatism for light of 587.5600nm, and the distortion for light of 587.5600nm are shown.
Referring to FIG. 3, light having a wavelength of 656.2800nm is indicated by a straight line, light having a wavelength of 587.5600nm is indicated by a dotted line, and light having a wavelength of 435.8400nm is indicated by a dashed line; wherein "RELATIVE FIELD HEIGHT" represents the ratio of the real image height to the object height, the real image height is the height of the real image formed in the imaging plane GC, and the corresponding angle is the angle of view; for example: as shown in fig. 3, "1.00 RELATIVE FIELD HEIGHT (60.80) °" indicates that the ratio of the real image to the object height is 1.00, the field angle at this time is (60.80) °, and so on, the coma aberration of the light with three wavelengths under different ratios (or different field angles) of the real image to the object height is obtained.
Referring to fig. 4, in some embodiments of the present invention, a compact ultra-wide angle, high pixel, low distortion fixed focus lens includes, in order from an object side to an image side: a first lens group G1 of negative power and a second lens group G2 of positive power;
the first lens group G1 includes: a negative power meniscus first lens L11, a negative power meniscus second lens L12, a positive power third lens L13 and a negative power meniscus fourth lens L14; the second lens L12 and the fourth lens L14 are aspheric lenses;
the second lens group G2 includes: a double convex fifth lens L21 with positive power, a sixth lens L22 with positive power, a meniscus seventh lens L23 with negative power, a meniscus eighth lens L24 with positive power, a meniscus ninth lens L25 with negative power and a reverse-curved tenth lens L26 with positive power; the fifth lens L21, the ninth lens L25 and the tenth lens L26 are aspheric lenses, and the sixth lens L22 with positive focal power and the seventh meniscus lens L23 with negative focal power are combined lenses;
referring to fig. 4, the specific parameters of the small ultra-wide-angle, high-pixel, low-distortion fixed-focus lens described in this embodiment are as follows: the focal length f is 4.95mm, the lens aperture value Fno is 2.47, the field angle ω is 61.32 °, and table 3 shows the radius of curvature r (mm), the distance d (mm), the refractive index Nd, and the abbe number ABV of each lens surface from the object side of the compact super-wide-angle, high-pixel, low-distortion fixed-focus lens described in this embodiment;
TABLE 3
| No | R | | Nd | ABV | |
| 1 | 19.2423 | 0.8 | 1.59644 | 60.47 | |
| 2 | 4.9028 | 1.3395 | |||
| 3 | 8.8246 | 0.8 | 1.53732 | 55.71 | |
| 4 | 3.1262 | 1.0151 | |||
| 5 | 5.7859 | 2 | 2.00912 | 29.13 | |
| 6 | 12.3717 | 0.9581 | |||
| 7 | -4.761 | 1.1433 | 1.53732 | 55.71 | |
| 8 | -9.1168 | 0.1 | |||
| 9 | inf | 0.1 | |||
| 10 | 6.1515 | 2 | 1.49856 | 81.49 | |
| 11 | -4.6307 | 0.6105 | |||
| 12 | -2004.459 | 2.2271 | 1.4381 | 95.1 | |
| 13 | -3.2 | 0.5 | 1.70444 | 30.05 | |
| 14 | -12.096 | 0.2226 | |||
| 15 | -9.1464 | 1.5036 | 1.53732 | 55.71 | |
| 16 | -6 | 0.2984 | |||
| 17 | -3.2993 | 1.65 | 1.65802 | 21.52 | |
| 18 | -4.0815 | 0.1 | |||
| 19 | 3.7726 | 1.6484 | 1.53732 | 55.71 | |
| 20 | 4.9626 | 3.869 | |||
| 21 | inf | 0.5 | 1.51872 | 64.2 | |
| 22 | inf | 0.1 |
The parameters of each aspheric surface are obtained according to the aspheric surface formula, as shown in table 4:
TABLE 4
| No. | K | *4 | *6 | *8 | *10 | *12 |
| 2 | 1.71E+00 | 9.99E-04 | -1.14E-04 | 3.60E-06 | -1.39E-07 | 1.29E-09 |
| 3 | -1.18E+00 | 3.67E-03 | -1.30E-04 | -3.09E-06 | 4.52E-07 | -2.31E-08 |
| 6 | -1.50E-01 | 2.83E-03 | 4.26E-04 | -1.12E-04 | 1.06E-05 | -4.20E-07 |
| 7 | 6.29E+00 | 3.57E-03 | 2.09E-03 | -6.58E-04 | 1.15E-04 | -7.31E-06 |
| 10 | 4.03E+00 | -5.32E-03 | 1.62E-03 | -7.63E-04 | 1.41E-04 | -1.41E-05 |
| 11 | 2.08E+00 | 3.41E-03 | -1.37E-04 | 3.22E-04 | -7.90E-05 | 1.02E-05 |
| 15 | -5.00E+01 | -6.71E-03 | 9.84E-04 | -5.31E-05 | 1.33E-06 | -6.30E-08 |
| 16 | -5.32E+00 | -3.48E-03 | 6.72E-04 | -2.53E-05 | 0.00E+00 | 0.00E+00 |
| 17 | -5.18E-01 | 1.45E-02 | -5.53E-04 | 1.28E-05 | 0.00E+00 | 0.00E+00 |
| 18 | -5.80E-01 | 4.52E-03 | 1.13E-04 | -1.82E-05 | 6.72E-07 | -8.71E-09 |
| 19 | -1.21E+00 | -6.84E-03 | 8.19E-05 | 3.05E-06 | -2.67E-07 | 4.57E-09 |
| 20 | -7.30E-01 | -8.03E-03 | 2.06E-04 | -3.96E-06 | 3.08E-08 | 4.22E-10 |
It should be noted that the aspheric surface formula is as follows:
wherein, the first and the second end of the pipe are connected with each other,
in Table 2 ". 4" is AH 4 The values of the terms, ". 6" in Table 2 are BH 6 Values of the terms, ". about.8" in Table 2 are CH 8 Values of the terms, DH for ". 10" in Table 2 10 Values of the terms, ". sup.12" in Table 2 are EH 12 The value of the term.
Referring to FIG. 5, light having a wavelength of 656.2800nm is indicated by a straight line, light having a wavelength of 587.5600nm is indicated by a dotted line, and light having a wavelength of 435.8400nm is indicated by a dashed dotted line; from left to right, the spherical aberration corresponding to light of three wavelengths, the astigmatism corresponding to light of 587.5600nm, and the distortion corresponding to light of 587.5600nm are shown.
Referring to FIG. 6, light having a wavelength of 656.2800nm is indicated by a straight line, light having a wavelength of 587.5600nm is indicated by a dotted line, and light having a wavelength of 435.8400nm is indicated by a dashed line; wherein "RELATIVE FIELD HEIGHT" represents the ratio of the real image height to the object height, the real image height is the height of the real image formed in the imaging plane GC, and the corresponding angle is the angle of view; for example: as shown in fig. 3, "1.00 RELATIVE FIELD HEIGHT (60.80) °" indicates that the ratio of the real image to the object height is 1.00, the field angle at this time is (60.80) °, and so on, the coma aberration of the light with three wavelengths under different ratios (or different field angles) of the real image to the object height is obtained.
In addition, as shown in table 5, with respect to conditional expressions (1) to (7), the values of the two specific examples are within the numerical ranges thereof.
TABLE 5
| No | Conditional formula (II) | Example 1 | Example 2 |
| (1) | 1.5＜|f1x/fw|＜2.5 | 2.39～2.36 | 1.88～2.28 |
| (2) | 0.9＜|f2x/fw|＜2.0 | 1.13～1.48 | 1.14～1.85 |
| (3) | 0.9＜|f2/fw|＜2.5 | 1.61 | 1.26 |
| (4) | 31.8≤VdG1≤52.77 | 41.11 | 44.69 |
| (5) | 56.60≤VdG2≤75.5 | 72.02 | 71.38 |
| (6) | 2.15＜Ttl/(tanω＊fw)＜3.0 | 2.62 | 2.68 |
| (7) | max/tanω/fw＞0.85 | 0.88 | 0.90 |
The utility model also provides a camera, include: the small ultra-wide-angle, high-pixel and low-distortion fixed-focus lens is as above.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above-described embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are to be included within the scope of the present invention defined by the claims.
Claims (9)
1. A small-sized ultra-wide-angle, high-pixel, low-distortion fixed-focus lens, comprising, in order from an object side to an image side: a first lens group with negative focal power and a second lens group with positive focal power;
the first lens group comprises at least 2 negative focal power lenses and at least 1 positive focal power lens; wherein, in the negative focal power lens included in the first lens group, at least 1 aspheric lens is provided;
the second lens group comprises at least 2 negative focal power lenses and at least 3 positive focal power lenses; the second lens group comprises at least 1 group of combined lenses, and the combined lenses are combined lenses of 1 negative focal power lens included in the second lens group and 1 positive focal power lens included in the second lens group; in addition, at least 2 aspheric lenses are provided in the positive power lenses included in the second lens group.
2. The miniature ultra-wide-angle, high-pixel and low-distortion prime lens of claim 1, wherein the miniature ultra-wide-angle, high-pixel and low-distortion prime lens satisfies the following conditions:
1.5<|f1x/fw|<2.5；
0.9<|f2x/fw|<2.0；
0.9<|f2/fw|<2.5；
wherein fw is the focal length of the small-sized super-wide-angle, high-pixel and low-distortion fixed-focus lens when the small-sized super-wide-angle, high-pixel and low-distortion fixed-focus lens is focused at an infinite position;
f1x is the focal length of any one of the first 3 lenses of the first lens group from the object side of the small ultra-wide-angle, high-pixel and low-distortion prime lens;
f2x is the focal length of any one of the first 3 lenses of the second lens group from the object side of the small super-wide-angle, high-pixel and low-distortion fixed-focus lens;
f2 is the composite focal length of the second lens group of the small ultra-wide-angle, high-pixel and low-distortion fixed-focus lens.
3. The miniature ultra-wide-angle, high-pixel and low-distortion prime lens of claim 1, wherein the miniature ultra-wide-angle, high-pixel and low-distortion prime lens satisfies the following conditions:
31.8≦VdG1≦52.77；
56.60≦VdG2≦75.5；
wherein VdG1 is the abbe number average of the d-line of the negative power lens in the first lens group, and VdG2 is the abbe number average of the d-line of the positive power lens in the second lens group.
4. The miniature ultra-wide-angle, high-pixel and low-distortion prime lens of claim 1, wherein the miniature ultra-wide-angle, high-pixel and low-distortion prime lens satisfies the following conditions:
2.15<Ttl/(tanω*fw)<3.0；
wherein, Ttl is the optical total length of the small ultra-wide-angle, high-pixel and low-distortion fixed-focus lens;
omega is the maximum incident angle of the small ultra-wide-angle, high-pixel and low-distortion fixed-focus lens; and fw is the focal length of the small-sized ultra-wide-angle, high-pixel and low-distortion fixed-focus lens when the small-sized ultra-wide-angle, high-pixel and low-distortion fixed-focus lens is focused at an infinite position.
5. The small ultra wide-angle, high pixel, low distortion fixed focus lens of claim 1, wherein the small ultra wide-angle, high pixel, low distortion fixed focus lens satisfies the following conditions:
Ymax/tanω/fw>0.85；
wherein, omega is the maximum incident angle of the small-sized super-wide-angle, high-pixel and low-distortion fixed-focus lens; ymax is the maximum real image height of the small ultra-wide-angle, high-pixel and low-distortion fixed-focus lens;
and fw is the focal length of the small-sized ultra-wide-angle, high-pixel and low-distortion fixed-focus lens when the small-sized ultra-wide-angle, high-pixel and low-distortion fixed-focus lens is focused at an infinite position.
6. The compact ultra-wide angle, high pixel, low distortion fixed focus lens of claim 1, further comprising: an aperture stop located between the first lens group and the second lens group.
7. The compact ultra-wide angle, high pixel, low distortion prime lens of claim 1, wherein the first lens group comprises: the lens comprises a negative focal power meniscus first lens, a negative focal power meniscus second lens, a positive focal power third lens and a positive focal power meniscus fourth lens; wherein the second lens and the fourth lens are aspheric lenses;
the second lens group includes: a double convex fifth lens with positive focal power, a double concave sixth lens with negative focal power, a double convex seventh lens with positive focal power, a meniscus eighth lens with negative focal power, a meniscus ninth lens with positive focal power and a reverse curved tenth lens with positive focal power; wherein the fifth lens, the ninth lens and the tenth lens are aspheric lenses, and the seventh lens and the eighth lens are combined lenses.
8. The compact ultra-wide angle, high pixel, low distortion prime lens of claim 1, wherein the first lens group comprises: the lens comprises a first negative-focal-power meniscus lens, a second negative-focal-power meniscus lens, a third positive-focal-power lens and a fourth negative-focal-power meniscus lens; wherein the second lens and the fourth lens are aspheric lenses;
the second lens group includes: the negative focal power type optical lens comprises a positive focal power double-convex fifth lens, a positive focal power sixth lens, a negative focal power meniscus seventh lens, a positive focal power meniscus eighth lens, a negative focal power meniscus ninth lens and a positive focal power reverse curve tenth lens; wherein the fifth lens, the ninth lens and the tenth lens are aspheric lenses, and the sixth lens and the seventh lens are combined lenses.
9. A camera, comprising: a compact ultra-wide angle, high pixel, low distortion fixed focus lens as claimed in any one of claims 1 to 8.
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