CN113281886A - Optical imaging lens and imaging apparatus - Google Patents
Optical imaging lens and imaging apparatus Download PDFInfo
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- CN113281886A CN113281886A CN202110828233.0A CN202110828233A CN113281886A CN 113281886 A CN113281886 A CN 113281886A CN 202110828233 A CN202110828233 A CN 202110828233A CN 113281886 A CN113281886 A CN 113281886A
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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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The invention discloses an optical imaging lens and imaging equipment, the optical imaging lens comprises the following components in sequence from an object side to an imaging surface along an optical axis: a diaphragm; the first lens with negative focal power has a concave object-side surface and a convex image-side surface; the image side surface of the second lens is a convex surface; a third lens having a positive refractive power, both the object-side surface and the image-side surface of the third lens being convex; a fourth lens having a positive refractive power, both the object-side surface and the image-side surface of the fourth lens being convex; the object side surface and the image side surface of the fifth lens are both concave surfaces, and the fourth lens and the fifth lens are glued into a bonding body; a sixth lens having positive optical power; a seventh lens element with negative optical power having a convex object-side surface at the paraxial region and a concave image-side surface at the paraxial region. The optical imaging lens has the advantages of large aperture, high relative illumination, high resolution and high imaging quality.
Description
Technical Field
The present invention relates to the field of imaging lens technology, and in particular, to an optical imaging lens and an imaging device.
Background
With the rapid development of the automobile industry, automation and in-vehicle monitoring begin to develop rapidly, and a vehicle-mounted camera is also developed rapidly as a key component of an automatic driving assistance system, and all-around information inside and outside a vehicle can be acquired through the vehicle-mounted camera such as a front view camera, a rear view camera, a look around camera and the like, so that a driver is helped to make a correct driving behavior, and therefore, the adaptability of the camera to the environment and the imaging stability become a safety guarantee in the driving process of the automobile. The vehicle-mounted lens is required to be used in various environments such as high and low temperature conditions and acid and alkali corrosion conditions, and is also required to be used in the conditions of insufficient illumination and dark light, and in these occasions, the stability of the performance of the lens under the high and low temperature change conditions and the imaging definition under different illumination conditions must be considered. Meanwhile, in order to meet the requirements of application occasions such as automatic driving and the like, under complicated and changeable road conditions, not only close-distance targets and road conditions in front of a vehicle need to be concerned, but also far-distance targets need to be concerned, and especially information of the distance of 100-200 meters in front of the vehicle needs to be concerned; in order to obtain the perception of distance, the lens is also required to have a long-focus characteristic and to be clear in imaging in a small viewing angle range.
However, optical lenses in the existing market generally have the defects of poor long-distance imaging, unclear edge field imaging and the like, so that the lenses have poor target identification performance in a long distance, and the use requirements of a vehicle-mounted monitoring system cannot be met.
Disclosure of Invention
Therefore, the present invention is directed to an optical imaging lens and an imaging apparatus, which have at least the advantages of a large aperture, high relative illumination, high resolution and high imaging quality.
The embodiment of the invention implements the above object by the following technical scheme.
In a first aspect, the present invention provides an optical imaging lens, comprising, in order from an object side to an imaging plane along an optical axis: a diaphragm; the lens comprises a first lens with negative focal power, a second lens and a third lens, wherein the object side surface of the first lens is a concave surface, and the image side surface of the first lens is a convex surface; the second lens with positive focal power, the object side surface of the second lens is a concave surface, a plane surface or a convex surface, and the image side surface of the second lens is a convex surface; a third lens having a positive optical power, the third lens having convex object and image side surfaces; the fourth lens is provided with positive focal power, and the object side surface and the image side surface of the fourth lens are convex surfaces; the fourth lens and the fifth lens are glued into an adhesive body; a sixth lens having positive optical power; a seventh lens having a negative optical power, an object-side surface of the seventh lens being convex at a paraxial region, an image-side surface of the seventh lens being concave at a paraxial region, and both the object-side surface and the image-side surface of the seventh lens having at least one inflection point; the optical imaging lens meets the following conditional expression: 2.95< f/IH < 3.1; wherein f represents the focal length of the optical imaging lens, and IH represents the corresponding image height of the optical imaging lens in a half field of view.
In a second aspect, the present invention provides an imaging apparatus, including an imaging element and the optical imaging lens provided in the first aspect, wherein the imaging element is configured to convert an optical image formed by the optical imaging lens into an electrical signal.
Compared with the prior art, the optical imaging lens and the imaging equipment provided by the invention have the advantages that the lens still has good imaging performance in high-temperature and low-temperature environments by reasonably matching the seven lenses with specific shapes and focal powers; meanwhile, the position of the diaphragm and the surface shape of each lens are reasonably arranged, so that the lens has long-focus performance and smaller distortion, and high-definition imaging in a longer distance can be realized; meanwhile, the optical imaging lens is also provided with a larger aperture, so that the imaging requirement of a darker environment can be met.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of an optical imaging lens according to a first embodiment of the present invention;
FIG. 2 is an MTF chart of an optical imaging lens according to a first embodiment of the present invention;
FIG. 3 is a vertical axis chromatic aberration diagram of an optical imaging lens according to a first embodiment of the present invention;
FIG. 4 is a diagram of relative illumination of an optical imaging lens according to a first embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an optical imaging lens according to a second embodiment of the present invention;
FIG. 6 is an MTF chart of an optical imaging lens according to a second embodiment of the present invention;
FIG. 7 is a vertical axis chromatic aberration diagram of an optical imaging lens according to a second embodiment of the present invention;
FIG. 8 is a diagram of relative illumination of an optical imaging lens according to a second embodiment of the present invention;
FIG. 9 is a schematic structural diagram of an optical imaging lens system according to a third embodiment of the present invention;
FIG. 10 is an MTF chart of an optical imaging lens according to a third embodiment of the present invention;
FIG. 11 is a vertical axis chromatic aberration diagram of an optical imaging lens according to a third embodiment of the present invention;
FIG. 12 is a diagram of relative illumination of an optical imaging lens according to a third embodiment of the present invention;
FIG. 13 is a schematic structural diagram of an optical imaging lens system according to a fourth embodiment of the present invention;
fig. 14 is an MTF chart of an optical imaging lens according to a fourth embodiment of the present invention;
FIG. 15 is a vertical axis chromatic aberration diagram of an optical imaging lens according to a fourth embodiment of the present invention;
FIG. 16 is a diagram of relative illumination of an optical imaging lens according to a fourth embodiment of the present invention;
fig. 17 is a schematic structural diagram of an optical imaging lens according to a fifth embodiment of the present invention;
fig. 18 is an MTF chart of an optical imaging lens according to a fifth embodiment of the present invention;
FIG. 19 is a vertical axis chromatic aberration diagram of an optical imaging lens according to a fifth embodiment of the present invention;
FIG. 20 is a diagram of relative illumination of an optical imaging lens according to a fifth embodiment of the present invention;
fig. 21 is a schematic structural view of an image forming apparatus according to a sixth embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Like reference numerals refer to like elements throughout the specification.
The invention provides an optical imaging lens, which sequentially comprises the following components from an object side to an imaging surface along an optical axis: the lens comprises a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an optical filter.
The first lens has negative focal power, the object side surface of the first lens is a concave surface, and the image side surface of the first lens is a convex surface;
the second lens has positive focal power, the object side surface of the second lens is a concave surface, a plane surface or a convex surface, and the image side surface of the second lens is a convex surface;
the third lens has positive focal power, and both the object side surface and the image side surface of the third lens are convex surfaces;
the fourth lens has positive focal power, and both the object side surface and the image side surface of the fourth lens are convex surfaces;
the fifth lens has negative focal power, the object side surface and the image side surface of the fifth lens are both concave surfaces, and the fourth lens and the fifth lens are glued into a bonding body;
the sixth lens has positive focal power;
the seventh lens element has a negative optical power, an object-side surface of the seventh lens element is convex at a paraxial region, an image-side surface of the seventh lens element is concave at the paraxial region, and both the object-side surface and the image-side surface of the seventh lens element have at least one inflection point;
the diaphragm is positioned at the foremost end of the optical imaging lens, so that the aperture of the front end can be reduced under the condition of ensuring a large aperture, and the aim of miniaturizing the aperture of the front end is fulfilled.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
2.95<f/IH<3.1；（1）
wherein f represents the focal length of the optical imaging lens, and IH represents the corresponding image height of the optical imaging lens in a half field of view. When the condition (1) is satisfied, the lens has a long-focus performance, the telephoto effect of the optical system is ensured, the system has a larger magnification ratio, and the imaging quality of the scenery in a far visual field range is better.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
-4.5<f1/f<-1；（2）
2<f2/f<7；（3）
0<f6/f<2；（4）
where f1 denotes a focal length of the first lens, f2 denotes a focal length of the second lens, f6 denotes a focal length of the sixth lens, and f denotes a focal length of the optical imaging lens. Satisfying the above conditional expressions (2) to (4), being beneficial to reasonably distributing the focal power of each lens, thereby achieving better aberration balance and improving the imaging quality of the lens.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
0<(D1+D2)/TTL<1；（5）
wherein D1 represents the maximum clear aperture of the first lens, D2 represents the maximum clear aperture of the second lens, and TTL represents the total optical length of the optical imaging lens. The condition formula (5) is satisfied, the front end aperture of the imaging lens is favorably controlled, and the front end volume of the lens is ensured to be small while the large aperture and the high relative illumination are realized.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
-0.1<SAG11/D1<-0.04；（6）
-2<R11/f<-1；（7）
wherein SAG11 denotes a rise of an object side surface of the first lens, D1 denotes a maximum clear aperture of the first lens, R11 denotes a radius of curvature of the object side surface of the first lens, and f denotes a focal length of the optical imaging lens. The conditional expressions (6) and (7) are satisfied, so that the surface shape of the first lens is smooth, the incident angle of light on the object side surface of the first lens is favorably controlled, and the tolerance sensitivity is reduced.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
7.5mm/rad<IH/FOV<8mm/rad；（8）
wherein, FOV represents the maximum field angle of the optical imaging lens, the unit is radian, and IH represents the corresponding image height of the optical imaging lens in a half field of view. The condition (8) is satisfied, and the control of the image height and the distortion of the optical imaging lens is facilitated.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
-5<Φ1/Φ2+Φ6/Φ7<-1；（9）
where Φ 1 denotes the power of the first lens, Φ 2 denotes the power of the second lens, Φ 6 denotes the power of the sixth lens, and Φ 7 denotes the power of the seventh lens. The condition formula (9) is satisfied, and the positive and negative focal powers of the lenses are matched, so that the field curvature is favorably reduced.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
0<CT34/TTL<0.06；（10）
wherein, CT34 represents the air space between the third lens and the fourth lens on the optical axis, and TTL represents the total optical length of the optical imaging lens. Satisfying above-mentioned conditional expression (10), being favorable to controlling the air interval between third lens and the fourth lens, reasonable interval is favorable to improving optical system's whole solution.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
0.1<SAG61/R61+SAG62/R62<0.6；（11）
where SAG61 denotes a saggital height of an object-side surface of the sixth lens, SAG62 denotes a saggital height of an image-side surface of the sixth lens, R61 denotes a radius of curvature of the object-side surface of the sixth lens, and R62 denotes a radius of curvature of the image-side surface of the sixth lens. The condition formula (11) is satisfied, and the aspheric surface shape of the sixth lens is reasonably controlled, so that the chromatic aberration and distortion of the marginal field of view are favorably corrected.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
1<ET7/CT7<3；（12）
-6<YR71/SAG71<-1；（13）
where ET7 denotes an edge thickness of the seventh lens, CT7 denotes a center thickness of the seventh lens, YR71 denotes a perpendicular distance of an inflection point on an object-side surface of the seventh lens from an optical axis, and SAG71 denotes a rise of an object-side surface of the seventh lens. Satisfying the above conditional expressions (12) and (13), the aspherical surface shape of the seventh lens element can be controlled reasonably, which is advantageous for correcting astigmatism and distortion of the optical system.
The invention is further illustrated below in the following examples. In each embodiment, the thickness, the curvature radius, and the material selection part of each lens in the optical imaging lens are different, and the specific difference can be referred to the parameter table of each embodiment. The following examples are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following examples, and any other changes, substitutions, combinations or simplifications which do not depart from the innovative points of the present invention should be construed as being equivalent substitutions and shall be included within the scope of the present invention.
The surface shape of the aspheric surface of the optical imaging lens in each embodiment of the invention satisfies the following equation:
wherein z represents the distance in the optical axis direction from the curved surface vertex, c represents the curvature of the curved surface vertex, K represents the conic coefficient, h represents the distance from the optical axis to the curved surface, and B, C, D, E and F represent the fourth, sixth, eighth, tenth and twelfth order curved surface coefficients, respectively.
First embodiment
Referring to fig. 1, a schematic structural diagram of an optical imaging lens 100 according to a first embodiment of the present invention is shown, where the optical imaging lens 100 sequentially includes, from an object side to an image plane along an optical axis: the lens includes a stop ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a cover glass G2.
The first lens L1 has negative focal power, the object-side surface S1 of the first lens is concave, and the image-side surface S2 of the first lens is convex;
the second lens L2 has positive focal power, the object-side surface S3 of the second lens is concave, and the image-side surface S4 of the second lens is convex;
the third lens L3 has positive optical power, and both the object-side surface S5 and the image-side surface S6 of the third lens are convex;
the fourth lens L4 has positive optical power, and both the object-side surface S7 and the image-side surface S8 of the fourth lens are convex;
the fifth lens L5 has negative focal power, the object side surface S8 and the image side surface S9 of the fifth lens are both concave, and the fourth lens L4 and the fifth lens L5 form a cemented lens group;
the sixth lens L6 has positive refractive power, and the object-side surface S10 of the sixth lens is convex, and the image-side surface S11 of the sixth lens is concave;
the seventh lens element L7 has negative optical power, the object-side surface S12 of the seventh lens element being convex at the paraxial region and concave at a distance from the optical axis, the image-side surface S13 of the seventh lens element being concave at the paraxial region, the object-side surface S12 and the image-side surface S13 of the seventh lens element having at least one inflection point;
the first lens L1, the sixth lens L6, and the seventh lens L7 are all glass aspheric lenses, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are all glass spherical lenses, and the stop ST is located at the foremost end of the lens.
The parameters related to each lens in the optical imaging lens 100 provided in this embodiment are shown in table 1.
TABLE 1
The surface shape coefficients of the aspherical surfaces of the first lens L1, the sixth lens L6, and the seventh lens L7 in the optical imaging lens 100 in the present embodiment are shown in table 2.
TABLE 2
The MTF map, the vertical axis chromatic aberration map, and the relative illuminance map of the optical imaging lens 100 according to the present embodiment are respectively shown in fig. 2, fig. 3, and fig. 4.
As can be seen from fig. 2, the MTF value of the optical imaging lens 100 of the present embodiment is greater than 0.5 at 100lp/mm (period/mm), greater than 0.25 at 200lp/mm, and the linear logarithm is in the range of 0 to 200lp/mm, and the MTF curve is uniformly and smoothly decreased in the process from the zero field of view to the maximum field of view, which indicates that the optical imaging lens 100 has good imaging quality and good detail resolution capability at both low frequency and high frequency.
As can be seen from FIG. 3, the vertical axis chromatic aberration is within + -3 μm in the wavelength range of 450nm-650nm, which indicates that the optical imaging lens 100 has good chromatic aberration correction capability.
As can be seen from fig. 4, the relative illuminance RI of the optical imaging lens 100 is greater than 80% in the maximum field range, which indicates that the optical imaging lens 100 has high imaging contrast and can form images well in each field.
Second embodiment
Referring to fig. 5, a schematic structural diagram of an optical imaging lens 200 according to a second embodiment of the present invention is shown, where the optical imaging lens 200 of the present embodiment is substantially the same as the first embodiment, and mainly includes that an object-side surface S3 of the second lens is a plane, and parameters of each lens, such as a curvature radius, a thickness, and a refractive index, are different.
Table 3 shows the parameters related to each lens of the optical imaging lens 200 provided in this embodiment.
TABLE 3
The surface shape coefficients of the respective aspherical surfaces in the optical imaging lens 200 in the present embodiment are shown in table 4.
TABLE 4
The MTF map, the vertical axis chromatic aberration map, and the relative illuminance map of the optical imaging lens 200 according to the present embodiment are shown in fig. 6, fig. 7, and fig. 8, respectively.
As can be seen from fig. 6, the MTF value of the optical imaging lens 200 of the present embodiment is greater than 0.55 at 100lp/mm, is greater than 0.3 at 200lp/mm, and has a linear logarithm within a range of 0-200 lp/mm, and the MTF curve is uniformly and smoothly decreased in a process from a zero field to a maximum field, which indicates that the optical imaging lens 200 has good imaging quality and good detail resolution capability at both low frequency and high frequency.
As can be seen from FIG. 7, the optical imaging lens 200 has good chromatic aberration correction capability within a wavelength range of 450nm to 650nm and within a range of + -3 μm of vertical axis chromatic aberration.
As can be seen from fig. 8, the relative illuminance RI of the optical imaging lens 200 in the maximum field range is greater than 80%, which indicates that the optical imaging lens 200 has high imaging contrast and can form images well in each field.
Third embodiment
Referring to fig. 9, a schematic structural diagram of an optical imaging lens 300 according to a third embodiment of the present invention is provided, and the optical imaging lens 300 of the present embodiment is substantially the same as the first embodiment, except that an object-side surface S3 of the second lens element is a convex surface, and parameters of each lens element, such as a curvature radius, a thickness, and a refractive index, are different. Table 5 shows the parameters related to each lens of the optical imaging lens 300 according to this embodiment.
TABLE 5
The surface shape coefficients of the respective aspherical surfaces in the optical imaging lens 300 in the present embodiment are shown in table 6.
TABLE 6
The MTF map, the vertical axis chromatic aberration map, and the relative illuminance map of the optical imaging lens 300 according to the present embodiment are shown in fig. 10, fig. 11, and fig. 12, respectively.
As can be seen from fig. 10, the MTF value of the optical imaging lens 300 of the present embodiment is greater than 0.5 at 100lp/mm, greater than 0.3 at 200lp/mm, and the linear logarithm is in the range of 0-200 lp/mm, and the MTF curve is uniformly and smoothly decreased in the process from the zero field of view to the maximum field of view, which indicates that the optical imaging lens 300 has good imaging quality and good detail resolution capability under both low frequency and high frequency conditions.
As can be seen from FIG. 11, the vertical axis chromatic aberration is within + -2.2 μm in the wavelength range of 450nm-650nm, which indicates that the optical imaging lens 300 has a good chromatic aberration correction capability.
As can be seen from fig. 12, the imaging relative illuminance RI of the optical imaging lens 300 is greater than 80% in the maximum field range, which indicates that the imaging relative illuminance RI of the optical imaging lens 300 is high and the image is good in each field.
Fourth embodiment
Referring to fig. 13, a schematic structural diagram of an optical imaging lens 400 according to a fourth embodiment of the present invention is shown, and the optical imaging lens 400 of the present embodiment is substantially the same as the optical imaging lens 400 of the first embodiment, except that an object-side surface S10 of the sixth lens element is a concave surface, an image-side surface S11 of the sixth lens element is a convex surface, and parameters of each lens element, such as a curvature radius, a thickness, and a refractive index, are different. Table 7 shows the parameters related to each lens of the optical imaging lens 400 provided in this embodiment.
TABLE 7
The surface shape coefficients of the respective aspherical surfaces in the optical imaging lens 400 in the present embodiment are shown in table 8.
TABLE 8
The MTF map, the vertical axis chromatic aberration map, and the relative illuminance map of the optical imaging lens 400 according to the present embodiment are shown in fig. 14, fig. 15, and fig. 16, respectively.
As can be seen from fig. 14, the MTF value of the optical imaging lens 400 of the present embodiment is greater than 0.55 at 100lp/mm, is greater than 0.3 at 200lp/mm, and has a linear logarithm within a range of 0-200 lp/mm, and the MTF curve is uniformly and smoothly decreased in a process from a zero field of view to a maximum field of view, which indicates that the optical imaging lens 400 has good imaging quality and good detail resolution capability at both low frequency and high frequency.
As can be seen from FIG. 15, the vertical axis chromatic aberration is within + -1.7 μm in the wavelength range of 450nm-650nm, which indicates that the optical imaging lens 400 has good chromatic aberration correction capability.
As can be seen from fig. 16, the imaging relative illuminance RI of the optical imaging lens 400 is greater than 75% in the maximum field range, which indicates that the imaging relative illuminance RI of the optical imaging lens 400 is high and the image formation is good in each field.
Fifth embodiment
Referring to fig. 17, a schematic structural diagram of an optical imaging lens 500 according to a fifth embodiment of the present invention is shown, and the optical imaging lens 500 of the present embodiment is substantially the same as the optical imaging lens 500 of the first embodiment, except that an object-side surface S10 of the sixth lens element is a convex surface, an image-side surface S11 of the sixth lens element is a convex surface, and parameters of each lens element, such as a curvature radius, a thickness, and a refractive index, are different.
Table 9 shows the parameters related to each lens of the optical imaging lens 500 according to this embodiment.
TABLE 9
The surface shape coefficients of the respective aspherical surfaces in the optical imaging lens 500 in the present embodiment are shown in table 10.
The MTF map, the vertical axis chromatic aberration map, and the relative illuminance map of the optical imaging lens 500 according to the present embodiment are shown in fig. 18, 19, and 20, respectively.
As can be seen from fig. 18, the MTF value of the optical imaging lens 500 of the present embodiment is greater than 0.6 at 100lp/mm, is greater than or equal to 0.4 at 200lp/mm, and has a linear logarithm within a range of 0 to 200lp/mm, and the MTF curve is uniformly and smoothly decreased in a process from a zero field to a maximum field, which indicates that the optical imaging lens 500 has good imaging quality and good detail resolution capability at both low frequency and high frequency.
As can be seen from FIG. 19, the vertical axis chromatic aberration is within + -1.7 μm in the wavelength range of 450nm-650nm, which indicates that the optical imaging lens 500 has a good chromatic aberration correction capability.
As can be seen from fig. 20, the imaging relative illuminance RI of the optical imaging lens 500 is 80% or more in the maximum field range, which indicates that the imaging relative illuminance RI of the optical imaging lens 500 is high and the image formation is good in each field.
Table 11 shows the optical characteristics corresponding to the above five embodiments, which mainly include the maximum field angle FOV, total optical length TTL, focal length F, F # of each optical imaging lens, and the corresponding numerical value of each conditional expression.
TABLE 11
Sixth embodiment
Referring to fig. 21, an imaging apparatus 600 according to a sixth embodiment of the present invention is shown, where the imaging apparatus 600 may include an imaging device 610 and an optical imaging lens (e.g., the optical imaging lens 100) in any of the embodiments described above. The imaging element 610 may be a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and may also be a CCD (Charge Coupled Device) image sensor.
The imaging device 600 may be a vehicle-mounted camera, a monitoring camera, or any other electronic device equipped with the optical imaging lens.
The imaging device 600 provided by the embodiment of the application includes the optical imaging lens 100, and since the optical imaging lens 100 has the advantages of large aperture, high relative illumination, high resolution and high imaging quality, the imaging device 600 having the optical imaging lens 100 also has the advantages of large aperture, high relative illumination, high resolution and high imaging quality.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
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 (11)
1. An optical imaging lens, comprising, in order from an object side to an imaging surface along an optical axis:
a diaphragm;
the lens comprises a first lens with negative focal power, a second lens and a third lens, wherein the object side surface of the first lens is a concave surface, and the image side surface of the first lens is a convex surface;
the second lens has positive focal power, and the image side surface of the second lens is a convex surface;
a third lens having a positive optical power, the third lens having convex object and image side surfaces;
the fourth lens is provided with positive focal power, and the object side surface and the image side surface of the fourth lens are convex surfaces;
the fourth lens and the fifth lens are glued into an adhesive body;
a sixth lens having positive optical power;
a seventh lens having a negative optical power, an object-side surface of the seventh lens being convex at a paraxial region, an image-side surface of the seventh lens being concave at a paraxial region, and both the object-side surface and the image-side surface of the seventh lens having at least one inflection point;
the optical imaging lens meets the following conditional expression:
2.95<f/IH<3.1；
wherein f represents the focal length of the optical imaging lens, and IH represents the corresponding image height of the optical imaging lens in a half field of view.
2. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
-4.5<f1/f<-1；
2<f2/f<7；
0<f6/f<2；
wherein f1 denotes a focal length of the first lens, f2 denotes a focal length of the second lens, f6 denotes a focal length of the sixth lens, and f denotes a focal length of the optical imaging lens.
3. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
0<(D1+D2)/TTL<1；
wherein D1 represents the maximum clear aperture of the first lens, D2 represents the maximum clear aperture of the second lens, and TTL represents the total optical length of the optical imaging lens.
4. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
-0.1<SAG11/D1<-0.04；
-2<R11/f<-1；
wherein SAG11 denotes a rise of an object side surface of the first lens, D1 denotes a maximum clear aperture of the first lens, R11 denotes a radius of curvature of the object side surface of the first lens, and f denotes a focal length of the optical imaging lens.
5. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
7.5mm/rad<IH/FOV<8mm/rad；
wherein, FOV represents the maximum field angle of the optical imaging lens, and IH represents the corresponding image height of the optical imaging lens in half field of view.
6. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
-5<Φ1/Φ2+Φ6/Φ7<-1；
where Φ 1 denotes an optical power of the first lens, Φ 2 denotes an optical power of the second lens, Φ 6 denotes an optical power of the sixth lens, and Φ 7 denotes an optical power of the seventh lens.
7. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
0<CT34/TTL<0.06；
wherein CT34 represents an air space on an optical axis between the third lens and the fourth lens, and TTL represents an optical total length of the optical imaging lens.
8. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
0.1<SAG61/R61+SAG62/R62<0.6；
wherein SAG61 represents a sagittal height of an object-side surface of the sixth lens, SAG62 represents a sagittal height of an image-side surface of the sixth lens, R61 represents a radius of curvature of the object-side surface of the sixth lens, and R62 represents a radius of curvature of the image-side surface of the sixth lens.
9. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
1<ET7/CT7<3；
-6<YR71/SAG71<-1；
wherein ET7 represents an edge thickness of the seventh lens, CT7 represents a center thickness of the seventh lens, YR71 represents a perpendicular distance of an inflection point on an object-side surface of the seventh lens from an optical axis, and SAG71 represents a sagittal height of the object-side surface of the seventh lens.
10. The optical imaging lens of claim 1, wherein the first lens, the sixth lens and the seventh lens are glass aspheric lenses, and the second lens, the third lens, the fourth lens and the fifth lens are glass spherical lenses.
11. An imaging apparatus comprising the optical imaging lens according to any one of claims 1 to 10 and an imaging element for converting an optical image formed by the optical imaging lens into an electric signal.
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| CN114488493A (en) * | 2022-04-18 | 2022-05-13 | 江西联益光学有限公司 | Optical lens |
| CN115268039A (en) * | 2022-09-28 | 2022-11-01 | 江西联创电子有限公司 | Optical lens |
| CN115508986A (en) * | 2022-11-16 | 2022-12-23 | 江西联益光学有限公司 | Optical lens |
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| CN108919459A (en) * | 2018-06-14 | 2018-11-30 | 江西联创电子有限公司 | Optical lens system |
| CN111025562A (en) * | 2019-12-26 | 2020-04-17 | 瑞声通讯科技(常州)有限公司 | Image pickup optical lens |
| CN112731630A (en) * | 2021-03-31 | 2021-04-30 | 江西联创电子有限公司 | Optical imaging lens |
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| US20170248772A1 (en) * | 2016-02-26 | 2017-08-31 | Ability Opto-Electronics Technology Co., Ltd. | Optical image capturing system |
| CN108919459A (en) * | 2018-06-14 | 2018-11-30 | 江西联创电子有限公司 | Optical lens system |
| CN111025562A (en) * | 2019-12-26 | 2020-04-17 | 瑞声通讯科技(常州)有限公司 | Image pickup optical lens |
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| CN114488493A (en) * | 2022-04-18 | 2022-05-13 | 江西联益光学有限公司 | Optical lens |
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| CN115508986A (en) * | 2022-11-16 | 2022-12-23 | 江西联益光学有限公司 | Optical lens |
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