CN107422461B - Monitoring lens - Google Patents
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- CN107422461B CN107422461B CN201710868691.0A CN201710868691A CN107422461B CN 107422461 B CN107422461 B CN 107422461B CN 201710868691 A CN201710868691 A CN 201710868691A CN 107422461 B CN107422461 B CN 107422461B
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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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- 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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Abstract
The invention provides a monitoring lens, which comprises a first lens group, a second lens group and a diaphragm, wherein the first lens group sequentially comprises a first lens with negative focal power, a second lens with positive focal power and a third lens with negative focal power from an object side to an imaging surface; the second lens group includes, from the object side to the imaging surface, a fourth lens having positive power, a fifth lens having positive power, and a sixth lens having negative power; the first lens, the second lens and the fifth lens are all glass spherical lenses, the third lens, the fourth lens and the sixth lens are all plastic aspheric lenses, and the optical centers of the lenses are located on the same straight line. According to the invention, 3 plastic aspheric lenses are adopted, so that the number of lenses is reduced, the length and weight of the lens are reduced, and the manufacturing cost is low; through the matching combination of lenses made of different materials and reasonable focal power and air interval distribution, the aberration of the lens is effectively corrected, and the lens has the advantages of small focus drift amount generated by high and low temperatures and the like.
Description
Technical Field
The invention relates to the technical field of camera lenses, in particular to a monitoring lens.
Background
With the rapid development of science and technology, people also have higher-level knowledge on security, and the monitoring lens emerges immediately. In recent years, a monitoring lens has become a major force of the security industry, the security industry is promoted to continuously advance and rapidly develop, the types of the monitoring lens are increasingly enriched along with the continuous expansion of the security market, but along with the wide use of the monitoring lens, people pay more attention to the performance problems of the imaging effect, the size of the view field angle and the like.
The existing monitoring lens sequentially comprises a first lens group, a diaphragm and a second lens group from an object side to an imaging surface along an optical axis, and different imaging display effects are achieved through optical combination of different lenses in the first lens group, the diaphragm and the second lens group.
The existing monitoring lens generally has the defects of large total length, small visual angle, large temperature influence, low resolution quality, small target surface, high cost and the like. For example, the day and night confocal lens of patent document CN105301739A uses three aspheric lenses made of plastic material and 2 glass lenses, and the view field angle is too small and the total length is too long; for example, in the large target surface day and night confocal monitoring lens of patent document CN105388591A, the number of lenses used is as many as 12, which increases the cost, and the angle of view is too small, so the resolution quality is poor; for example, in patent document CN102323657A, although the resolution of the security lens is improved and the total length is reduced by using a plurality of aspheric plastic lenses, the angle of the lens field is not large enough and the target surface is too small.
Disclosure of Invention
Accordingly, an object of the present invention is to provide a monitoring lens having a large angle of view and high imaging quality.
A monitoring lens comprises a first lens group, a second lens group and a diaphragm arranged between the first lens group and the second lens group from an object side to an imaging surface along an optical axis;
the first lens group includes, in order from the object side to the imaging surface, a first lens having negative power, a second lens having positive power, and a third lens having negative power;
the second lens group includes, in order from the object side to the imaging surface, a fourth lens having positive power, a fifth lens having positive power, and a sixth lens having negative power;
the first lens, the second lens and the fifth lens are all glass spherical lenses, the third lens, the fourth lens and the sixth lens are all plastic aspheric lenses, and the optical centers of the lenses are located on the same straight line.
The monitoring lens is a day and night wide-angle monitoring lens, the number of lenses can be reduced by adopting the design of three plastic aspheric lenses, the total length, the weight and the manufacturing cost of the lens are effectively reduced, the service life of the monitoring lens is long, the stability is high, meanwhile, through the matching combination of the lenses made of different materials, reasonable focal power and air interval distribution, the aberration of the lens is effectively corrected, the lens has the advantages of small focus drift amount generated by high and low temperature and the like, the monitoring lens has the high imaging quality effect that the field angle is not less than 137 degrees and the target surface is greater than 1/2.7 'through the combined design of the first lens group and the second lens group, and the monitoring lens is clear in imaging, high in sharpness and large in target surface and can be matched with a 1/2.7' CMOS chip.
Further, the first lens adopts the concave surface orientation the meniscus lens of imaging surface, the second lens the fourth lens with the fifth lens all adopts biconvex type lens, the third lens adopts biconcave type lens, the sixth lens adopts the convex surface orientation the meniscus lens of imaging surface.
Further, the monitoring lens satisfies the conditional expression:
wherein
Represents the optical power of the first lens,
represents the optical power of the monitoring lens,
represents the combined power of the first lens group,
representing a combination of the second lens groupThe focal power.
Further, the monitoring lens satisfies the relation: 3.5<TL/IH<8.5 of, wherein TLThe optical total length of the monitoring lens is represented, and IH represents the half-image height of the monitoring lens.
Further, the monitoring lens satisfies the conditional expression: 35 < | V5-V6| < 60, wherein V5 represents the Abbe number of the fifth lens and V6 represents the Abbe number of the sixth lens.
Further, the monitoring lens satisfies the conditional expression: -0.7 < (R61-R62)/(R61+ R62) < -0.2, wherein R61 represents the vertex radius of curvature of the object-side surface of the sixth lens and R62 represents the vertex radius of curvature of the image-side surface of the sixth lens.
Further, the aspherical surface shapes of the third lens, the fourth lens, and the sixth lens each satisfy the following equation:
wherein z represents the distance between the curved surface and the vertex of the curved surface in the optical axis direction, c represents the curvature corresponding to the radius, h represents the radial coordinate (the unit of the radial coordinate is the same as the unit of the lens length), K represents the coefficient of the conic quadratic curve, and B, C, D, E represents the coefficients corresponding to the radial coordinates of fourth order, sixth order, eighth order and tenth order respectively.
Furthermore, the monitoring lens further comprises an optical filter, and the optical filter is arranged on the rear side of the sixth lens.
Further, the optical filter adopts any one of a visible light band optical filter or an infrared optical filter.
Furthermore, the diaphragm is made of shading paper, a light through hole is formed in the middle of the diaphragm, and the light through hole is of a circular through hole structure.
Drawings
Fig. 1 is a schematic cross-sectional structure diagram of a monitoring lens in an embodiment of the present invention;
FIG. 2 is a field curvature graph of a monitoring lens according to a first embodiment of the present invention;
FIG. 3 is a diagram illustrating a distortion curve of a monitoring lens according to a first embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating an on-axis spherical aberration of a monitoring lens according to a first embodiment of the present invention;
FIG. 5 is a MTF curve of the monitoring lens according to the first embodiment of the present invention;
FIG. 6 is an analysis diagram of the monitoring lens at 80 ℃ according to the first embodiment of the present invention;
FIG. 7 is an analytic view of a monitoring lens at-20 ℃ in accordance with a first embodiment of the present invention;
FIG. 8 is a graph of curvature of field of a monitoring lens according to a second embodiment of the present invention;
FIG. 9 is a diagram illustrating a distortion curve of a monitoring lens according to a second embodiment of the present invention;
FIG. 10 is a schematic diagram illustrating an on-axis spherical aberration of a monitoring lens according to a second embodiment of the present invention;
FIG. 11 is a MTF curve of a monitoring lens according to a second embodiment of the present invention;
FIG. 12 is a graph of curvature of field of a monitoring lens according to a third embodiment of the present invention;
FIG. 13 is a diagram illustrating a distortion curve of a monitoring lens according to a third embodiment of the present invention;
FIG. 14 is a schematic diagram illustrating on-axis spherical aberration of a monitoring lens according to a third embodiment of the present invention;
FIG. 15 is a MTF curve of a monitoring lens according to a third embodiment of the present invention;
description of the symbols of the main elements
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100 | |
10 |
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11 | |
12 |
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13 | |
20 |
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21 | |
22 |
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23 | |
30 |
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33 |
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
In order to facilitate a better understanding of the invention, the invention will be further explained below with reference to the accompanying drawings of embodiments. Embodiments of the present invention are shown in the drawings, but the present invention is not limited to the preferred embodiments described above. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Referring to fig. 1, a schematic cross-sectional structure of a monitoring lens 100 according to an embodiment of the present disclosure is shown, where the monitoring lens 100 includes, from an object side to an image plane 33, a first lens group 10, a second lens group 20, and a stop 30 disposed between the first lens group 10 and the second lens group 20;
the first lens group 10 includes, in order from the object side to the imaging surface 33, a first lens 11 having negative power, a second lens 12 having positive power, and a third lens 13 having negative power;
the second lens group 20 includes, in order from the object side to the imaging surface 33, a fourth lens 21 having positive power, a fifth lens 22 having positive power, and a sixth lens 23 having negative power;
the first lens 11, the second lens 12 and the fifth lens 22 all adopt glass spherical lenses, the third lens 13, the fourth lens 21 and the sixth lens 23 all adopt plastic aspherical lenses, and the optical centers of the lenses are located on the same straight line.
The aspherical surface shapes of the third lens 13, the fourth lens 21, and the sixth lens 23 all satisfy the following equation:
wherein z represents the distance between the curved surface and the vertex of the curved surface in the optical axis direction, c represents the curvature corresponding to the radius, h represents the radial coordinate (the unit of the radial coordinate is the same as the unit of the lens length), K represents the coefficient of the conic quadratic curve, and B, C, D, E represents the coefficients corresponding to the radial coordinates of fourth order, sixth order, eighth order and tenth order, respectively. When K is less than-1, the curve is hyperbolic, parabolic when equal to-1, elliptic when between-1 and 0, circular when equal to 0, and oblate when greater than 0. The surface shape and size of the front and back aspheric surfaces of the lens can be accurately set through the parameters. The aspheric surface shape satisfies an even aspheric surface equation, and different aspheric surface coefficients are utilized to maximize the function of the aspheric surface in the system, so as to obtain a more complete resolving power, preferably, the aspheric surface shapes of the third lens 13, the fourth lens 21 and the sixth lens 23 can be accurately set through the curved surface equation, and the imaging definition and sharpness of the monitoring lens 100 are greatly improved by utilizing the powerful function of the aspheric surface on aberration.
The monitoring lens 100 further includes an optical filter 31, and the optical filter 31 is disposed behind the sixth lens 23.
The optical filter 31 adopts any one of a visible light band optical filter or an infrared optical filter, visible light and near infrared light are respectively in day and night working bands, and through the design of the optical filter 31, the transmission of light in non-working bands is further inhibited, so that chromatic aberration and parasitic light of an optical system can be effectively reduced, and the imaging effect is improved.
The diaphragm 30 is made of light-shielding paper, and the diaphragm 30 is used for precisely adjusting the light transmission amount. In order to take a clear picture in a dark scene, a large luminous flux lens is needed, so that the diaphragm 30 is arranged, the control of the incidence angle (CRA) of the chief ray reaching the imaging surface 33 is facilitated, the CRA can be effectively controlled within 27 +/-3 degrees, the incidence requirement of a chip is better met, the diaphragm 30 is made of masking paper, the processing accuracy is guaranteed to the maximum extent, the processing error is reduced, the adjustment is convenient, a light through hole is formed in the middle of the diaphragm 30 and used for facilitating the adjustment of the diaphragm 30 to the light, and the light through hole is of a circular through hole structure.
Specifically, the diaphragm 30 is arranged on the rear side of the third lens 13, so that the field angle can be increased, the incident angle of a matched chip can be better, the diaphragm 30 is made of masking paper, the requirement on a lens barrel light through hole is reduced, the forming difficulty is reduced, the production efficiency is improved, and the production cost is reduced.
In the present invention, the first lens group 10 and the second lens group 20 are combined to achieve the effect of non-focal plane drift of visible light and near infrared light, and preferably, the monitoring lens 100 is made of a low dispersion glass material, so that chromatic aberration is effectively reduced, and the purple fringing phenomenon is reduced to the greatest extent.
In all embodiments of the present invention, the cross-sectional structure of the monitoring lens 100 is shown in fig. 1, the monitoring lens 100 is a wide-angle monitoring lens for day and night use, the number of lenses can be reduced by adopting a design of three plastic aspheric lenses, the total length, weight and manufacturing cost of the lens can be effectively reduced, and further the monitoring lens 100 has long service life and high stability, and simultaneously the aberration of the lens can be effectively corrected and the lens has the advantages of small focus drift amount generated by high and low temperatures by matching and combining lenses of different materials, reasonable focal power and air interval distribution, and the monitoring lens 100 has the high imaging quality effects of a field angle of not less than 137 degrees and a target surface of more than 1/2.7 ″ by combining the first lens group 10 and the second lens group 20, and the monitoring lens 100 has a clear image, High sharpness, large target surface and can match with 1/2.7' CMOS chip.
In the following different embodiments, the parameters related to each lens in the monitoring lens 100 are referred to in the parameter table of each embodiment.
Example 1
Fig. 1 is a schematic cross-sectional structure diagram of a monitoring lens 100 according to a first embodiment of the present invention, wherein related parameters of each lens in the monitoring lens 100 according to the present embodiment refer to table 1.
TABLE 1
The aspherical parameters of the third lens 13, the fourth lens 21, and the sixth lens 23 in this embodiment are shown in table 2.
TABLE 2
| Surface number | K | B | C | D | E |
| 5 | 3.70E+00 | -6.20E-03 | 2.00E-02 | -6.64E-03 | 1.20E-03 |
| 6 | -8.30E+01 | -2.54E-02 | 2.95E-02 | -1.01E-02 | 1.94E-03 |
| 8 | -2.80E+01 | -2.71E-04 | -1.37E-03 | 2.81E-04 | -3.99E-05 |
| 9 | -1.75E+01 | -3.95E-02 | 8.48E-03 | -2.22E-03 | 1.17E-04 |
| 12 | -3.13E+00 | -2.96E-02 | 6.19E-03 | -9.09E-04 | 5.51E-05 |
| 13 | -1.36E+01 | -9.12E-03 | 3.84E-03 | -4.46E-04 | 2.20E-05 |
Referring to fig. 2 and fig. 3, which are field curvature and distortion graphs of the monitoring lens 100 in embodiment 1, respectively, an on-axis point spherical aberration curve at a field of view end is shown in fig. 4, and it can be seen from fig. 2 to fig. 4 that: curvature of field, distortion and chromatic aberration of point on axis are all well corrected. The MTF curve is shown in fig. 5, which shows the good resolution and resolution of the lens. FIGS. 6 and 7 are analysis graphs of the environmental temperature at 80 ℃ and-20 ℃ showing that the lens has good high and low temperature analysis and the focus drift amount is about 5um when the environmental temperature is greatly changed.
Example 2
The monitoring lens 100 provided in this embodiment is substantially the same as the first embodiment, except that the parameters related to each lens of the monitoring lens in this embodiment are different from the parameters related to each lens of the first embodiment. Please refer to table 3, which shows the relevant parameters of each lens of the monitoring lens 100 in this embodiment.
TABLE 3
The aspherical parameters of the third lens 13, the fourth lens 21, and the sixth lens 23 in this embodiment are shown in table 4.
TABLE 4
| Surface number | K | B | C | D | E |
| 5 | 3.71E+00 | -1.25E-02 | 1.95E-02 | -6.26E-03 | 1.15E-03 |
| 6 | -6.32E+01 | -2.76E-02 | 2.76E-02 | -1.01E-02 | 2.07E-03 |
| 8 | -2.28E+01 | -4.88E-04 | -1.30E-03 | 6.11E-05 | 1.04E-05 |
| 9 | -1.36E+01 | -3.66E-02 | 7.84E-03 | -2.53E-03 | 1.43E-04 |
| 12 | -2.85E+00 | -2.75E-02 | 6.08E-03 | -1.05E-03 | 7.38E-05 |
| 13 | -1.17E+01 | -6.18E-03 | 3.41E-03 | -4.28E-04 | 2.36E-05 |
Referring to fig. 8 and 9, in the field curvature and distortion curves of the monitoring lens 100 provided in embodiment 2, the on-axis point spherical aberration curve at the field of view end is shown in fig. 10, and the MTF curve is shown in fig. 11, and it can be seen from fig. 8 to 11 that the field curvature, distortion and on-axis point spherical aberration of the monitoring lens 100 are all well corrected and have good resolution capability.
Example 3
The monitoring lens 100 provided in this embodiment is substantially the same as the first embodiment, except that the parameters related to each lens of the monitoring lens 100 in this embodiment are different from the parameters related to each lens in the first embodiment. Please refer to table 5, which shows the relevant parameters of each lens of the monitoring lens 100 in this embodiment.
TABLE 5
Table 6 shows aspheric parameters of the third lens 13, the fourth lens 21, and the sixth lens 23 according to this embodiment.
TABLE 6
| Surface number | K | B | C | D | E |
| 5 | 3.66E+00 | -1.00E-02 | 1.95E-02 | -6.52E-03 | 1.26E-03 |
| 6 | -1.61E+02 | -2.72E-02 | 2.81E-02 | -1.04E-02 | 2.09E-03 |
| 8 | -2.92E+01 | 1.99E-04 | -1.07E-03 | 2.90E-04 | -6.54E-05 |
| 9 | -1.43E+01 | -3.82E-02 | 8.36E-03 | -2.37E-03 | 9.91E-05 |
| 12 | -3.20E+00 | -2.88E-02 | 6.05E-03 | -9.67E-04 | 6.15E-05 |
| 13 | -1.51E+01 | -7.73E-03 | 3.66E-03 | -4.64E-04 | 2.44E-05 |
Referring to fig. 12 and 13, in the field curvature and distortion curves of the monitoring lens 100 provided in embodiment 3, the on-axis point spherical aberration curve at the field of view end is shown in fig. 14, and the MTF curve is shown in fig. 15, and as can be seen from fig. 12 to 15, the field curvature, distortion and on-axis point spherical aberration of the monitoring lens 100 are all well corrected, and have good resolution capability.
Referring to table 7, the optical characteristics corresponding to each of the above 3 embodiments include the system focal length F, F #, and the total system length TLAngle of view 2 θ, and a value corresponding to each of the foregoing conditional expressions.
TABLE 7
To limit the overall length of the system and ensure that the system has a sufficiently good imaging quality, the monitoring lens 100 satisfies the relation: 3.5<TL/IH<8.5；
Wherein, TLRepresents the optical overall length of the monitoring lens 100, and IH represents the half-image height of the monitoring lens 100. When T isLWhen the value of/IH exceeds the upper limit, the wholeIf the total length of the monitoring lens 100 is too long, or if the total length of the system is shortened as a whole, the image height is insufficient; when T isLIf the value of/IH exceeds the lower limit, the focal power of each lens is too large, which makes it difficult to correct lens aberration and significantly reduces the resolving power.
In the present invention, in order to provide an appropriate lens size while correcting aberrations well, the monitoring lens 100 satisfies the conditional expression:
wherein
Represents the optical power of the first lens 11,
represents the optical power of the monitoring lens 100,
representing the combined power of the first lens group 10,
representing the combined power of the second lens group 20.
When in use
When the value of (d) exceeds the upper limit, the focal power of the first lens 11 is too strong, and although the purpose of quickly collecting light can be achieved and the total length of the system can be made small, astigmatism and curvature of field generated by the focal power are generatedThe distortion is too large, the correction is difficult, and meanwhile, the curvature radius of the lens is reduced, so that the processing difficulty is improved, and the system error is increased; when in use
When the value of (b) exceeds the lower limit, the power of the first lens 11 decreases, and the above various aberrations relatively decrease, but the power thereof decreases, resulting in lengthening of the system.
Conditional formula (II)
The ratio of the focal powers of the first lens group 10 and the entire lens system is defined, so that wide-field-angle object plane light can be effectively converged into the monitor lens 100, and a large aberration is generated on the surface. When in use
When the value of (b) exceeds the upper limit, the focal power of the first lens group 10 is too strong, and the total length of the system can be made small, but the spherical aberration generated thereby is too large and is difficult to correct; when in use
When the value of (b) exceeds the lower limit, the power of the third lens element 13 decreases, the spherical aberration relatively decreases, but the optical power thereof decreases, resulting in an increase in the total length of the system.
Conditional formula (II)
The ratio of the focal power of the second lens group 20 to the focal power of the whole lens group is defined, and the combined focal power of the second lens group 20 and the first lens group 10 correspond to each other, so that the first lens group 10 can be effectively matched, and aberration can be reasonably removed. When in use
When the value of (d) exceeds the upper limit, the optical power of the sixth lens element 23 is too high, and the total length of the system can be made small, but the spherical aberration, astigmatism, and field curvature generated by the optical power are too large to be corrected; when in use
Above the lower limit, the power of the sixth lens 23 decreases, the above-mentioned aberrations are relatively reduced, but the reduction in its optical power results in a lengthening of the system.
To correct chromatic aberration, the monitoring lens 100 satisfies the conditional expression: 35 < | V5-V6| < 60, wherein V5 represents the Abbe number of the fifth lens 22, and V6 represents the Abbe number of the sixth lens 23;
wherein V5 denotes the abbe number of the fifth lens 22, and V6 denotes the abbe number of the sixth lens 23. When the value of V5-V6 exceeds the lower limit, the correction of chromatic aberration is insufficient; when the value of | V5-V6| exceeds the upper limit, material selection is difficult.
To correct curvature of field and distortion, the monitoring lens 100 satisfies the conditional expression: -0.7 < (R61-R62)/(R61+ R62) < -0.2;
wherein R61 denotes a vertex radius of curvature of the object-side surface of the sixth lens 23, and R62 denotes a vertex radius of curvature of the image-side surface of the sixth lens 23. The above relation defines the shape of the sixth lens 23 having a negative power, and when the value of (R61-R62)/(R61+ R62) exceeds the upper limit, the distortion thereof is reduced, but the curvature of field is difficult to correct; when the value of (R61-R62)/(R61+ R62) exceeds the lower limit, the curvature of field thereof is reduced, but distortion correction is difficult.
In conclusion, compared with the prior art, the invention has the following advantages:
(1) the lens of the invention adopts 3 plastic aspheric lenses, which can reduce the number of lenses, effectively reduce the length and weight of the lens and reduce the manufacturing cost; meanwhile, through the matching combination of lenses made of different materials and reasonable focal power and air interval distribution, the aberration of the lens is effectively corrected, the imaging effect is good, and the lens has the advantages of small focus drift amount generated by high and low temperatures and the like;
(2) the lens of the invention has the advantages that the non-focal plane drift of visible light and near infrared light is realized;
(3) the lens has the advantages of clear imaging, high sharpness, large target surface and the like, and can be matched with a 1/2.7' CMOS chip;
(4) the lens of the invention can reach a large field angle of more than 137 degrees;
(5) the lens adopts a low-dispersion glass material, so that chromatic aberration is effectively reduced, and the purple fringing phenomenon is reduced to the greatest extent.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A monitoring lens comprises six lenses, and comprises a first lens group, a second lens group and a diaphragm arranged between the first lens group and the second lens group from an object side to an imaging surface along an optical axis, and is characterized in that:
the first lens group includes, in order from the object side to the imaging surface, a first lens having negative power, a second lens having positive power, and a third lens having negative power;
the second lens group includes, in order from the object side to the imaging surface, a fourth lens having positive power, a fifth lens having positive power, and a sixth lens having negative power;
the first lens, the second lens and the fifth lens are all glass spherical lenses, the third lens, the fourth lens and the sixth lens are all plastic non-spherical lenses, and the optical centers of the lenses are positioned on the same straight line;
the first lens adopts a meniscus lens with a concave surface facing the imaging surface, the second lens, the fourth lens and the fifth lens adopt a biconvex lens, the third lens adopts a biconcave lens, and the sixth lens adopts a meniscus lens with a convex surface facing the imaging surface;
the monitoring lens satisfies the relational expression: 3.5< TL/IH <8.5, where TL represents the total optical length of the monitoring lens and IH represents the half-image height of the monitoring lens.
2. The monitoring lens according to claim 1, wherein the monitoring lens satisfies the conditional expression:
-1.50＜φ11/φ＜-0.5；
-1.70＜φ1/φ＜-0.7；
0.6＜φ2/φ＜1.6；
where φ 11 represents the first lens power, φ represents the monitor lens power, φ 1 represents the combined power of the first lens group, φ 2 represents the combined power of the second lens group.
3. The monitoring lens according to claim 1, wherein the monitoring lens satisfies the conditional expression: 35 < | V5-V6| < 60, wherein V5 represents the Abbe number of the fifth lens and V6 represents the Abbe number of the sixth lens.
4. The monitoring lens according to claim 1, wherein the monitoring lens satisfies the conditional expression: -0.7 < (R61-R62)/(R61+ R62) < -0.2, wherein R61 represents the vertex radius of curvature of the object-side surface of the sixth lens and R62 represents the vertex radius of curvature of the image-side surface of the sixth lens.
5. The monitoring lens according to claim 1, wherein aspherical surface shapes of the third lens, the fourth lens, and the sixth lens each satisfy the following equation:
wherein z represents the distance between the curved surface and the vertex of the curved surface in the optical axis direction, c represents the curvature corresponding to the radius, h represents the radial coordinate, K represents the coefficient of the conic quadratic curve, and B, C, D, E represents the coefficients corresponding to the radial coordinates of fourth order, sixth order, eighth order and tenth order, respectively.
6. The monitoring lens according to claim 1, further comprising a filter disposed behind the sixth lens.
7. The monitoring lens according to claim 6, wherein the filter is any one of a visible light band filter and an infrared filter.
8. The monitoring lens according to claim 1, wherein the diaphragm is made of masking paper, and a light through hole is formed in the middle of the diaphragm, and the light through hole is of a circular through hole structure.
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|---|---|---|---|---|
| JP6815210B2 (en) * | 2017-01-26 | 2021-01-20 | 株式会社タムロン | Imaging optical system and imaging device |
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Application publication date: 20171201 Assignee: Zhongshan Liantuo Optical Co.,Ltd. Assignor: JIANGXI LIANCHUANG ELECTRONIC Co.,Ltd. Contract record no.: X2023980040632 Denomination of invention: Surveillance Camera Granted publication date: 20211116 License type: Common License Record date: 20230828 |