CN107390350B - Imaging lens group - Google Patents
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- CN107390350B CN107390350B CN201710838882.2A CN201710838882A CN107390350B CN 107390350 B CN107390350 B CN 107390350B CN 201710838882 A CN201710838882 A CN 201710838882A CN 107390350 B CN107390350 B CN 107390350B
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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
- G02B13/0035—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 three lenses
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Abstract
The application discloses an imaging lens group. The imaging lens group comprises the following components in order from an object side to an image side: a first lens having a positive refractive power and a convex object-side surface; a second lens having a negative refractive power and a concave image-side surface; and at least one subsequent lens, wherein at least one of the first lens, the second lens and the at least one subsequent lens is a glass aspheric lens, the imaging lens group has a transmittance T1>85% corresponding to 650nm band, the imaging lens group has a transmittance T2>88% corresponding to 490nm band, and the imaging lens group has a transmittance T3>75% corresponding to 430nm band. The imaging lens group comprises at least one glass aspheric lens, so that the imaging lens group has higher imaging brightness, permeability and color reducibility, and the performance of the imaging lens group can be greatly improved.
Description
Technical Field
The invention relates to an imaging lens group, in particular to an imaging lens group with a glass aspheric surface.
Background
Currently, a common photosensitive Device used in an optical system includes a CCD (Charge-Coupled Device) and a CMOS (Complementary Metal-Oxide Semiconductor). With the improvement of the performance and the reduction of the size of the common photosensitive elements, corresponding requirements are put forward on the high imaging quality and the miniaturization of the camera lens used in cooperation with the common photosensitive elements. Meanwhile, people have higher and higher requirements on the imaging quality of portable electronic products, and electronic products such as mobile phones and tablet computers become thinner and smaller, which also requires high imaging quality and miniaturized camera lenses.
The present invention is therefore directed to an imaging lens group that is miniaturized and has improved imaging quality.
Disclosure of Invention
To solve at least some of the problems of the prior art, the present invention provides an imaging lens group.
One aspect of the present invention provides an imaging lens group, comprising, in order from an object side to an image side of the imaging lens group: a first lens having a positive refractive power and a convex object-side surface; a second lens having a negative refractive power and a concave image-side surface; and at least one subsequent lens, wherein at least one of the first lens, the second lens and the at least one subsequent lens is a glass aspheric lens, the imaging lens group has a transmittance T1>85% corresponding to 650nm, the imaging lens group has a transmittance T2>88% corresponding to 490nm, and the imaging lens group has a transmittance T3>75% corresponding to 430 nm.
According to one embodiment of the present invention, a ratio of influence of a unit temperature of a glass aspherical lens on a unit refractive index of dng/dt and a ratio of influence of a unit temperature of a lens closest to an image side on a unit refractive index of dni/dt satisfy | dng/dt |/| < 0.1.
According to one embodiment of the present invention, the glass aspherical lens has an abbe Vg of 0.35< Vg/Vi <1.5 with respect to the lens closest to the image side.
According to one embodiment of the present invention, the refractive index Ng of the glass aspherical lens satisfies 1.5. ltoreq. Ng.ltoreq.2.0.
According to one embodiment of the present invention, 1.5< f/EPD <2.5 is satisfied between the effective focal length f of the imaging lens group and the entrance pupil diameter of the imaging lens group.
According to one embodiment of the present invention, an effective focal length f of the imaging lens group and an effective focal length fg of the glass aspherical lens satisfy-0.6 < f/fg < 1.2.
According to one embodiment of the present invention, 2< f/R1<4 is satisfied between the effective focal length f of the imaging lens group and the radius of curvature R1 of the object-side surface of the first lens.
According to one embodiment of the invention, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R4 of the image-side surface of the second lens satisfy 0< R1/R4< 1.0.
Another aspect of the present invention provides an imaging lens group, comprising, in order from an object side to an image side of the imaging lens group: a first lens; a second lens; and at least one subsequent lens, wherein at least one of the first lens, the second lens and the at least one subsequent lens is a glass aspheric lens, and an influence rate dng/dt of a unit temperature of the glass aspheric lens on the unit refractive index and an influence rate dni/dt of the unit temperature of a lens closest to the image side on the unit refractive index satisfy | dng/dt |/| dni/dt | < 0.1.
According to one embodiment of the invention, the first lens has a positive power and its object-side surface is convex, and the second lens has a negative power and its image-side surface is concave.
Another aspect of the present invention provides an imaging lens group, comprising, in order from an object side to an image side of the imaging lens group: a first lens having a positive refractive power and a convex object-side surface; a second lens having a negative refractive power and a concave image-side surface; and at least one subsequent lens, wherein at least one of the first lens, the second lens and the at least one subsequent lens is a glass aspheric lens, and 2< f/R1<4 is satisfied between the effective focal length f of the imaging lens group and the radius of curvature R1 of the object side surface of the first lens.
In one embodiment, the at least one subsequent lens, in order from the second lens to the image side along the optical axis, comprises: a third lens, a fourth lens, and a fifth lens, the third lens may have a positive optical power; the fourth lens may have a negative optical power; and the fifth lens may have a negative optical power.
In one embodiment, the at least one subsequent lens, in order from the second lens to the image side along the optical axis, comprises: a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the third lens can have positive focal power or negative focal power; the fourth lens may have a positive power or a negative power; the fifth lens may have a positive power or a negative power; and the sixth lens may have a positive power or a negative power.
According to one embodiment of the present invention, the glass aspherical lens has an abbe Vg of 0.35< Vg/Vi <1.5 with respect to the lens closest to the image side.
According to one embodiment of the present invention, the refractive index Ng of the glass aspherical lens satisfies 1.5. ltoreq. Ng.ltoreq.2.0.
According to one embodiment of the present invention, 1.5< f/EPD <2.5 is satisfied between the effective focal length f of the imaging lens group and the entrance pupil diameter of the imaging lens group.
According to one embodiment of the present invention, an effective focal length f of the imaging lens group and an effective focal length fg of the glass aspherical lens satisfy-0.6 < f/fg < 1.2.
According to one embodiment of the invention, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R4 of the image-side surface of the second lens satisfy 0< R1/R4< 1.0.
The imaging lens group comprises at least one glass aspheric lens, so that the imaging lens group has higher imaging brightness, permeability and color reducibility, and the performance of the imaging lens group can be greatly improved.
Drawings
Other features, objects and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments thereof, taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 shows a schematic configuration diagram of an imaging lens group of embodiment 1;
fig. 2 to 5 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens group of embodiment 1;
fig. 6 is a schematic view showing a structure of an imaging lens group of embodiment 2;
fig. 7 to 10 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of an imaging lens group of example 2;
fig. 11 is a schematic view showing the structure of an imaging lens group of embodiment 3;
fig. 12 to 15 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of an imaging lens group of embodiment 3;
fig. 16 is a schematic view showing the structure of an imaging lens group of embodiment 4;
fig. 17 to 20 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of an imaging lens group of example 4;
fig. 21 is a schematic view showing a structure of an imaging lens group of embodiment 5;
fig. 22 to 25 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of an imaging lens group of example 5; and
fig. 26 shows transmittance of the imaging lens group according to the embodiment of the present disclosure for each wavelength band.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It will be understood that when an element or layer is referred to herein as being "on," "connected to" or "coupled to" another element or layer, it can be directly on, connected or coupled to the other element or layer or intervening elements or layers may be present. When an element is referred to as being "directly on," "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers present. Like numbers refer to like elements throughout. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood that, although the terms 1, 2, first, second, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present application.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, a feature that does not define a singular or plural form is also intended to include a feature of the plural form unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes," "including," "has," "having," "contains" and/or "containing," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. A statement such as "at least one of" when appearing after a list of elements modifies the entire list of elements rather than modifying individual elements within the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The application provides an imaging lens group. The imaging lens group according to the application is provided with the following components in order from an object side to an image side of the imaging lens group: a first lens having a positive optical power, a second lens having a negative optical power, and at least one subsequent lens. In an embodiment of the present application, an object-side surface of the first lens element is convex, and an image-side surface of the second lens element is concave. In an embodiment of the present application, at least one of the first lens, the second lens and the at least one subsequent lens is a glass aspheric lens.
In one embodiment, the at least one subsequent lens, in order from the second lens to the image side along the optical axis, comprises: a third lens, a fourth lens, and a fifth lens, the third lens may have a positive optical power; the fourth lens may have a negative optical power; and the fifth lens may have a negative optical power.
In one embodiment, the at least one subsequent lens, in order from the second lens to the image side along the optical axis, comprises: a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the third lens can have positive focal power or negative focal power; the fourth lens may have a positive power or a negative power; the fifth lens may have a positive power or a negative power; and the sixth lens may have a positive power or a negative power.
In the embodiment of the application, the transmittance T1 of the imaging lens group corresponding to 650nm wave band is more than 85%, the transmittance T2 of the imaging lens group corresponding to 490nm wave band is more than 88%, and the transmittance T3 of the imaging lens group corresponding to 430nm wave band is more than 75%. The optical lens made of glass materials is used in the imaging lens group, so that the lens has higher transmittance, and higher brightness, permeability and color reduction performance are realized during imaging.
In the embodiment of the present application, the influence rate dng/dt of the unit temperature of the glass aspheric lens on the unit refractive index and the influence rate dni/dt of the unit temperature of the lens closest to the image side on the unit refractive index satisfy | dng/dt |/| <0.1, and more specifically satisfy | dng/dt |/| < dni/dt | < 0.03. By satisfying the above relationship, the lens still has higher resolving power at different temperatures, and the sensitivity of the lens to the temperature is reduced.
In the embodiment of the present application, 0.35< Vg/Vi <1.5 is satisfied between the dispersion coefficient Vg of the glass aspherical lens and the dispersion coefficient Vi of the lens closest to the image side, and more specifically, 0.37 ≦ Vg/Vi ≦ 1.46 is satisfied. The imaging lens group uses the glass lens, reasonably distributes the dispersion coefficient of the glass by satisfying the relation, and is beneficial to greatly reducing the chromatic aberration of the optical system.
In the embodiment of the present application, the refractive index Ng of the glass aspherical lens satisfies 1.5. ltoreq. Ng.ltoreq.2.0, more specifically, 1.5. ltoreq. Ng.ltoreq.1.92. By satisfying the above relationship, the refractive index range of the glass is reasonably selected, the use of high-price glass is avoided, and the cost of the lens is ensured.
In the embodiment of the present application, 1.5< f/EPD <2.5, more specifically, 1.68 ≦ f/EPD ≦ 2.28 is satisfied between the effective focal length f of the imaging lens group and the entrance pupil diameter of the imaging lens group. The imaging lens group satisfying the above relationship has a larger luminous flux, so that the lens barrel acquires sufficiently high luminance.
In the embodiments of the present application, the effective focal length f of the imaging lens group and the effective focal length fg of the glass aspherical lens satisfy-0.6 < f/fg <1.2, more specifically, satisfy-0.52 ≦ f/fg ≦ 1.05. By satisfying the above relationship, the focal power of the glass lens in the whole system can be reasonably distributed, so that the system can obtain higher MTF performance.
In the embodiment of the present application, 2< f/R1<4, more specifically, 2.35. ltoreq. f/R1. ltoreq.3.85 is satisfied between the effective focal length f of the imaging lens group and the radius of curvature R1 of the object-side surface of the first lens. By satisfying the above relationship, the curvature of the object side of the first lens is set within a reasonable range, so that the entire lens has better tolerance sensitivity and matching processing capability.
In the embodiment of the application, the curvature radius R1 of the object side surface of the first lens and the curvature radius R4 of the image side surface of the second lens satisfy 0< R1/R4<1.0, more specifically, satisfy 0.43 ≦ R1/R4 ≦ 0.91. By satisfying the above relation, the curvatures of the first lens and the second lens can be effectively matched, thereby reducing the vertical axis chromatic aberration of the system and ensuring that the color reduction is not influenced in the use process of the chip.
The present application is further described below with reference to specific examples.
Example 1
An imaging lens group according to embodiment 1 of the present application is described first with reference to fig. 1 to 5.
Fig. 1 is a schematic diagram showing a structure of an imaging lens group of embodiment 1. As shown in fig. 1, the imaging lens group includes 6 lenses. The 6 lenses are a first lens E1 having an object side surface S1 and an image side surface S2, a second lens E2 having an object side surface S3 and an image side surface S4, a third lens E3 having an object side surface S5 and an image side surface S6, a fourth lens E4 having an object side surface S7 and an image side surface S8, a fifth lens E5 having an object side surface S9 and an image side surface S10, and a sixth lens E6 having an object side surface S11 and an image side surface S12, respectively. The first lens E1 to the sixth lens E6 are disposed in order from the object side to the image side of the imaging lens group.
The first lens element E1 can have positive power, and its object-side surface S1 can be convex and its image-side surface S2 can be concave.
The second lens element E2 may have a negative power, and the object-side surface S3 may be convex and the image-side surface S4 may be concave.
The third lens element E3 may have a negative power, and the object-side surface S5 may be convex and the image-side surface S6 may be concave.
The fourth lens element E4 may have positive power, and its object-side surface S7 may be concave and its image-side surface S8 may be convex.
The fifth lens element E5 may have positive power, and the object-side surface S9 may be convex and the image-side surface S10 may be convex.
The sixth lens element E6 can have positive or negative power, and the object-side surface S11 can be convex and the image-side surface S12 can be concave.
The imaging lens group further comprises a filter E7 which is used for filtering infrared light and provided with an object side surface S13 and an image side surface S14. In this embodiment, light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.
In this embodiment, the first through sixth lenses E1 through E6 have respective effective focal lengths f1 through f6, respectively. The first lens E1 to the sixth lens E6 are arranged in order along the optical axis and collectively determine the total effective focal length f of the imaging lens group. Table 1 below shows effective focal lengths f1 to f6 of the first lens E1 to the sixth lens E6, a total effective focal length f of the imaging lens group, a total length ttl (mm) of the imaging lens group, and half of the HFOV of the maximum field angle of the imaging lens group.
| f1(mm) | 3.80 | f(mm) | 3.98 |
| f2(mm) | -13.15 | TTL(mm) | 4.75 |
| f3(mm) | -799.36 | HFOV(°) | 37.2 |
| f4(mm) | 4.59 | ||
| f5(mm) | 62.19 | ||
| f6(mm) | -3.27 |
TABLE 1
Table 2 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens in the imaging lens group in this embodiment, where the unit of the radius of curvature and the thickness are both millimeters (mm).
TABLE 2
In the present embodiment, each lens may be an aspheric lens, and each aspheric surface type x is defined by the following formula:
wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is the conic coefficient (given in table 2); ai is the correction coefficient of the i-th order of the aspheric surface.
Table 3 below shows the high-order term coefficients A of the respective aspherical surfaces S1-S12 usable for the respective aspherical lenses in this embodiment 4 、A 6 、A 8 、A 10 、A 12 、A 14 And A 16 。
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 6.7997E-02 | -1.0838E-02 | -1.3608E-02 | 2.6747E-02 | -2.8199E-02 | -2.7550E-03 | 0 |
| S2 | -1.2817E-01 | 1.9200E-01 | -2.0493E-01 | 9.1988E-02 | -7.8504E-03 | -1.4426E-04 | 0 |
| S3 | -1.1770E-01 | 2.5939E-01 | -2.3979E-01 | 2.0491E-01 | -2.5180E-01 | -7.7637E-02 | 0 |
| S4 | 6.8034E-02 | -6.1153E-02 | 3.9792E-01 | -8.4952E-01 | 1.1184E+00 | 3.3172 |
0 |
| S5 | -1.2157E-01 | -1.0010E-01 | 5.6687E-01 | -1.6551E+00 | 2.6813E+00 | 8.1982 |
0 |
| S6 | -8.1545E-02 | 1.2847E-02 | -1.9958E-01 | 3.3446E-01 | -2.9092E-01 | -1.8820E-02 | 0 |
| S7 | 1.8502E-02 | 1.7304E-01 | -4.7368E-01 | 4.7737E-01 | -2.6772E-01 | 7.4387E-02 | -6.8273E-03 |
| S8 | -4.9933E-03 | 1.0585E-01 | -2.7614E-01 | 2.9143E-01 | -1.5441E-01 | -4.1718E-03 | 0 |
| S9 | 1.7488E-01 | -3.7184E-01 | 2.4379E-01 | -9.9592E-02 | 3.0269E-02 | 4.5700E-04 | 0 |
| S10 | 1.8257E-01 | -3.7618E-01 | 2.7075E-01 | -1.1502E-01 | 3.0228E-02 | 2.6014E-04 | 0 |
| S11 | -2.4321E-01 | 3.2139E-02 | 6.8480E-02 | -4.0675E-02 | 1.0132E-02 | 5.7167E-05 | 0 |
| S12 | -1.9844E-01 | 1.2031E-01 | -4.3468E-02 | 9.5673E-03 | -1.2854E-03 | -2.6916E-06 | 0 |
TABLE 3
Fig. 2 shows on-axis chromatic aberration curves of the imaging lens group of embodiment 1, which represent convergent focus deviations of light rays of different wavelengths after passing through an optical system. Fig. 3 shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the imaging lens group of embodiment 1. Fig. 4 shows distortion curves of the imaging lens group of embodiment 1, which represent distortion magnitude values in the case of different angles of view. Fig. 5 shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 1, which represents a deviation of different image heights on an imaging surface after light passes through the imaging lens group. In summary, and referring to fig. 2 to 5, the imaging lens assembly according to embodiment 1 is an imaging lens assembly including a glass lens and having improved imaging performance.
Example 2
An imaging lens group according to embodiment 2 of the present application is described below with reference to fig. 6 to 10. The imaging lens groups described in this embodiment 2 and the following embodiments are the same in arrangement structure as the imaging lens groups described in embodiment 1, except for parameters of each lens of the imaging lens group, such as a radius of curvature, a thickness, a material, a conic coefficient, an effective focal length, an on-axis pitch, a high-order term coefficient of each lens, and the like. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity.
Fig. 6 is a schematic diagram showing a structure of an imaging lens group of embodiment 2. The imaging lens group includes, in order from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6.
The first lens element E1 can have positive power, and its object-side surface S1 can be convex and its image-side surface S2 can be concave.
The second lens element E2 may have a negative power, and the object-side surface S3 may be convex and the image-side surface S4 may be concave.
The third lens element E3 may have positive power, and the object-side surface S5 may be convex and the image-side surface S6 may be convex.
The fourth lens element E4 may have positive power, and its object-side surface S7 may be concave and its image-side surface S8 may be convex.
The fifth lens element E5 may have positive power, and its object-side surface S9 may be concave and its image-side surface S10 may be convex.
The sixth lens element E6 may have negative power, and the object-side surface S11 may be convex and the image-side surface S12 may be concave.
Table 4 below shows effective focal lengths f1 to f6 of the first lens E1 to the sixth lens E6, a total effective focal length f of the imaging lens group, a total length TTL of the imaging lens group, and half of the HFOV of the maximum field angle of the imaging lens group.
| f1(mm) | 3.84 | f(mm) | 3.95 |
| f2(mm) | -7.64 | TTL(mm) | 4.74 |
| f3(mm) | 12.86 | HFOV(°) | 36.9 |
| f4(mm) | 5.44 | ||
| f5(mm) | 24.57 | ||
| f6(mm) | -3.20 |
TABLE 4
Table 5 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens in the imaging lens group in this embodiment, where the unit of the radius of curvature and the thickness are both millimeters (mm).
TABLE 5
Table 6 below shows the high-order term coefficients of the respective aspherical surfaces S1 to S12 that can be used for the respective aspherical lenses in this embodiment. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 5.9884E-02 | 1.2520E-02 | -7.1245E-02 | 1.4101E-01 | -1.5030E-01 | 8.2919E-02 | -1.9445E-02 |
| S2 | -1.7031E-01 | 3.5300E-01 | -4.9955E-01 | 5.3066E-01 | -4.0669E-01 | 1.8440E-01 | -3.6780E-02 |
| S3 | -8.2834E-02 | 1.7005E-01 | -1.3630E-01 | 5.3446E-02 | -9.8162E-03 | 0 | 0 |
| S4 | 4.3748E-02 | 4.8250E-02 | -1.6099E-02 | 1.0532 |
0 | 0 | 0 |
| S5 | -8.0300E-02 | 2.6901E-02 | -8.0864E-02 | 1.5107E-01 | -1.1364E-01 | 2.3530E-02 | 2.0176E-02 |
| S6 | -6.5578E-02 | 3.9312E-02 | -2.3502E-01 | 3.1615E-01 | -1.8188E-01 | 2.0441E-02 | 1.7567E-02 |
| S7 | -9.1358E-03 | 2.5500E-01 | -5.5098E-01 | 4.8140E-01 | -2.0903E-01 | 3.2763E-02 | 1.7135E-03 |
| S8 | 2.3723E-02 | 1.3952E-01 | -4.4187E-01 | 4.6780E-01 | -2.3769E-01 | 5.9287E-02 | -5.8798E-03 |
| S9 | 2.4015E-01 | -3.7778E-01 | 1.6217E-01 | -1.8838E-02 | -4.1738E-03 | 1.3279E-03 | -1.0689E-04 |
| S10 | 2.2254E-01 | -3.6616E-01 | 2.1163E-01 | -6.7669E-02 | 1.3330E-02 | -1.5119E-03 | 7.4009E-05 |
| S11 | -2.5460E-01 | 3.1826E-02 | 6.4993E-02 | -3.4925E-02 | 7.7475E-03 | -8.1718E-04 | 3.3285E-05 |
| S12 | -1.9219E-01 | 1.0351E-01 | -3.0228E-02 | 4.1863E-03 | -1.2383E-04 | -3.0892E-05 | 2.5932E-06 |
TABLE 6
Fig. 7 shows on-axis chromatic aberration curves of the imaging lens group of embodiment 2, which represent convergent focus deviations of light rays of different wavelengths after passing through an optical system. Fig. 8 shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the imaging lens group of embodiment 2. Fig. 9 shows distortion curves of the imaging lens group of embodiment 2, which represent distortion magnitude values in the case of different angles of view. Fig. 10 shows a chromatic aberration of magnification curve of the imaging lens group of example 2, which represents a deviation of different image heights on an imaging surface after light passes through the imaging lens group. In summary, and referring to fig. 7 to 10, the imaging lens assembly according to embodiment 1 is an imaging lens assembly including a glass lens and having improved imaging performance.
Example 3
An imaging lens group according to embodiment 3 of the present application is described below with reference to fig. 11 to 15.
Fig. 11 is a schematic diagram showing the structure of an imaging lens group of embodiment 3. The imaging lens group includes, in order from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6.
The first lens element E1 can have positive power, and its object-side surface S1 can be convex and its image-side surface S2 can be concave.
The second lens element E2 may have a negative power, and the object-side surface S3 may be convex and the image-side surface S4 may be concave.
The third lens element E3 may have positive power, and the object-side surface S5 may be convex and the image-side surface S6 may be concave.
The fourth lens element E4 may have positive power, and its object-side surface S7 may be convex and its image-side surface S8 may be concave.
The fifth lens element E5 may have positive power, and the object-side surface S9 may be convex and the image-side surface S10 may be convex.
The sixth lens element E6 may have a negative power, and the object-side surface S11 may be concave and the image-side surface S12 may be concave.
Table 7 below shows effective focal lengths f1 to f6 of the first lens E1 to the sixth lens E6, a total effective focal length f of the imaging lens group, a total length TTL of the imaging lens group, and half of a maximum field angle HFOV of the imaging lens group.
| f1(mm) | 5.87 | f(mm) | 3.89 |
| f2(mm) | -6.27 | TTL(mm) | 4.73 |
| f3(mm) | 4.13 | HFOV(°) | 38.0 |
| f4(mm) | -42.33 | ||
| f5(mm) | 2.31 | ||
| f6(mm) | -1.89 |
TABLE 7
Table 8 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens in the imaging lens group in this embodiment, where the unit of the radius of curvature and the thickness are both millimeters (mm).
TABLE 8
Table 9 below shows the high-order term coefficients of the respective aspherical surfaces S1 to S12 usable for the respective aspherical lenses in this embodiment, wherein the respective aspherical surface types can be defined by the formula (1) given in the above-described embodiment 1.
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 |
| S1 | 6.7750E-02 | -2.3812E-02 | -7.1382E-03 | 1.6614E-02 | -1.7261E-02 | 5.2311 |
0 | 0 |
| S2 | 9.5732E-02 | -2.1355E-01 | 1.3275E-01 | -2.9433E-02 | 0 | 0 | 0 | 0 |
| S3 | 5.0053E-02 | -1.5870E-01 | 1.4302E-01 | -4.3142E-02 | 0 | 0 | 0 | 0 |
| S4 | -2.1995E-02 | 1.3891E-02 | 6.0708E-02 | -5.2138E-02 | 0 | 0 | 0 | 0 |
| S5 | -2.5279E-02 | 3.5894E-02 | -2.7905E-02 | 2.0346E-02 | -1.0814E-02 | 0 | 0 | 0 |
| S6 | 2.5036E-02 | -3.4922E-02 | 0 | 0 | 0 | 0 | 0 | 0 |
| S7 | -1.1380E-01 | 5.7022E-02 | -1.6606E-01 | 1.4740E-01 | -6.8711E-02 | 0 | 0 | 0 |
| S8 | -8.9880E-02 | 7.4402E-03 | -1.8637E-02 | 5.6152E-02 | -1.0948E-01 | 1.1187E-01 | -5.0281E-02 | 8.0165E-03 |
| S9 | 3.3858E-03 | 5.8082E-03 | -2.6128E-01 | 5.0754E-01 | -4.9163E-01 | 2.5871E-01 | -6.9584E-02 | 7.4651E-03 |
| S10 | 4.8112E-01 | -7.3920E-01 | 6.8320E-01 | -3.3116E-01 | 7.3466E-02 | -1.1625E-03 | -2.2888E-03 | 2.8050E-04 |
| S11 | 6.2838E-02 | -4.4983E-01 | 5.7784E-01 | -3.4371E-01 | 1.1367E-01 | -2.1632E-02 | 2.2277E-03 | -9.6542E-05 |
| S12 | -1.4238E-01 | 7.9143E-02 | -2.7097E-02 | 4.4431E-03 | 1.5017E-04 | -1.9761E-04 | 3.0840E-05 | -1.5870E-06 |
TABLE 9
Fig. 12 shows on-axis chromatic aberration curves of the imaging lens group of embodiment 3, which represent the convergent focus deviation of light rays of different wavelengths after passing through the optical system. Fig. 13 shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the imaging lens group of embodiment 3. Fig. 14 shows distortion curves of the imaging lens group of embodiment 3, which represent distortion magnitude values in the case of different angles of view. Fig. 15 shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 3, which represents deviation of different image heights on an imaging surface after light passes through the imaging lens group. In summary, and referring to fig. 12 to 15, the imaging lens group according to embodiment 1 is an imaging lens group including a glass lens and having improved imaging performance.
Example 4
An imaging lens group according to embodiment 4 of the present application is described below with reference to fig. 16 to 20.
Fig. 16 is a schematic diagram showing the structure of an imaging lens group of embodiment 4. The imaging lens group includes, in order from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6.
The first lens element E1 can have positive power, and its object-side surface S1 can be convex and its image-side surface S2 can be concave.
The second lens element E2 may have a negative power, and the object-side surface S3 may be convex and the image-side surface S4 may be concave.
The third lens element E3 may have positive power, and the object-side surface S5 may be convex and the image-side surface S6 may be convex.
The fourth lens element E4 may have a negative power, and the object-side surface S7 may be concave and the image-side surface S8 may be convex.
The fifth lens element E5 may have positive power, and its object-side surface S9 may be convex and its image-side surface S10 may be concave.
The sixth lens element E6 may have positive power, and the object-side surface S11 may be convex and the image-side surface S12 may be concave.
Table 10 below shows effective focal lengths f1 to f6 of the first lens E1 to the sixth lens E6, a total effective focal length f of the imaging lens group, a total length TTL of the imaging lens group, and half of the HFOV of the maximum field angle of the imaging lens group.
Table 11 below shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens in the imaging lens group in this embodiment, where the units of the radius of curvature and the thickness are millimeters (mm).
TABLE 11
Table 12 below shows the high-order term coefficients of the respective aspherical surfaces S1 to S12 usable for the respective aspherical lenses in this embodiment, wherein the respective aspherical surface types can be defined by formula (1) given in example 1 above.
TABLE 12
Fig. 17 shows on-axis chromatic aberration curves of the imaging lens group of example 4, which represent convergent focus deviations of light rays of different wavelengths after passing through an optical system. Fig. 18 shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the imaging lens group of embodiment 4. Fig. 19 shows distortion curves of the imaging lens group of example 4, which represent distortion magnitude values in the case of different angles of view. Fig. 20 shows a chromatic aberration of magnification curve of the imaging lens group of example 4, which represents a deviation of different image heights on an imaging surface after light passes through the imaging lens group. In summary, as can be seen from fig. 17 to 20, the imaging lens assembly according to embodiment 1 is an imaging lens assembly including a glass lens and having improved imaging performance.
Example 5
An imaging lens group according to embodiment 5 of the present application is described below with reference to fig. 21 to 25.
Fig. 21 is a schematic diagram showing the structure of an imaging lens group of embodiment 5. The imaging lens group includes, in order from an object side to an image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5.
The first lens element E1 may have positive power, and the object-side surface S1 may be convex and the image-side surface S2 may be convex.
The second lens element E2 may have a negative power, and its object-side surface S3 may be concave and its image-side surface S4 may be concave.
The third lens element E3 may have positive power, and the object-side surface S5 may be convex and the image-side surface S6 may be convex.
The fourth lens element E4 may have a negative power, and its object-side surface S7 may be concave and its image-side surface S8 may be concave.
The fifth lens element E5 may have negative power, and the object-side surface S9 may be concave and the image-side surface S10 may be convex.
Table 13 below shows effective focal lengths f1 to f5 of the first lens E1 to the fifth lens E5, a total effective focal length f of the imaging lens group, a total length TTL of the imaging lens group, and half of a maximum field angle HFOV of the imaging lens group.
| f1(mm) | 2.60 | f(mm) | 7.19 |
| f2(mm) | -3.20 | TTL(mm) | 6.40 |
| f3(mm) | 8.38 | HFOV(°) | 16.1 |
| f4(mm) | -5.93 | ||
| f5(mm) | -13.60 |
Table 14 below shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens in the imaging lens group in this embodiment, where the unit of the radius of curvature and the thickness are both millimeters (mm).
TABLE 14
Table 15 below shows the high-order term coefficients of the respective aspherical surfaces S1 to S12 usable for the respective aspherical lenses in this embodiment, wherein the respective aspherical surface types can be defined by formula (1) given in example 1 above.
Watch 15
Fig. 22 shows on-axis chromatic aberration curves of the imaging lens group of embodiment 5, which represent the convergent focus deviation of light rays of different wavelengths after passing through the optical system. Fig. 23 shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the imaging lens group of embodiment 5. Fig. 24 shows distortion curves of the imaging lens group of example 5, which represent distortion magnitude values in the case of different angles of view. Fig. 25 shows a chromatic aberration of magnification curve of the imaging lens group of example 5, which represents a deviation of different image heights on an imaging surface after light passes through the imaging lens group. In summary, and referring to fig. 22 to 25, the imaging lens assembly according to embodiment 1 is an imaging lens assembly including a glass lens and having improved imaging performance.
Fig. 26 shows transmittances of the imaging lens group according to the embodiment of the present disclosure for respective wavelength bands. As shown in the figure, the transmittance T1 of the imaging lens group corresponding to the 650nm wave band is more than 85%, the transmittance T2 of the imaging lens group corresponding to the 490nm wave band is more than 88%, and the transmittance T3 of the imaging lens group corresponding to the 430nm wave band is more than 75%.
In summary, in the above examples 1 to 5, each conditional expression satisfies the conditions of the following table 16.
| Conditions/examples | 1 | 2 | 3 | 4 | 5 |
| |dng/dt|/|dni/dt| | 0.06 | 0.03 | 0.05 | 0.05 | 0.03 |
| Vg/Vi | 1.46 | 0.37 | 0.95 | 0.95 | 0.55 |
| Ng | 1.50 | 1.92 | 1.69 | 1.69 | 1.68 |
| f/EPD | 1.68 | 1.68 | 1.69 | 1.69 | 2.28 |
| f/fg | 1.05 | -0.52 | 0.94 | 0.22 | 0.86 |
| f/R1 | 2.45 | 2.38 | 2.35 | 2.52 | 3.85 |
| R1/R4 | 0.77 | 0.84 | 0.91 | 0.71 | 0.43 |
TABLE 16
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention according to the present application is not limited to the specific combination of the above-mentioned features, but also covers other embodiments where any combination of the above-mentioned features or their equivalents is made without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (6)
1. An imaging lens group comprising, in order from an object side to an image side of the imaging lens group: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, the number of lenses having power in the imaging lens group being six,
the first lens has positive focal power and the object side surface of the first lens is a convex surface;
the second lens has negative focal power and the image side surface of the second lens is a concave surface;
the fifth lens has positive focal power;
at least one of the first lens to the sixth lens is a glass aspherical lens,
2< f/R1<4 is satisfied between an effective focal length f of the imaging lens group and a radius of curvature R1 of the object side surface of the first lens,
an effective focal length f of the imaging lens group and an entrance pupil diameter of the imaging lens group satisfy 1.5< f/EPD ≦ 1.69, an
When the glass aspheric lens is at least one of the first lens to the fifth lens, an abbe number Vg and an abbe number Vi of a lens closest to the image side satisfy 0.35< Vg/Vi < 1.5.
2. Imaging lens group according to claim 1,
the transmittance T1 of the imaging lens group corresponding to a 650nm wave band is more than 85 percent,
the imaging lens group has a transmittance T2 of more than 88% corresponding to 490nm wave band,
the imaging lens group has transmittance T3 of more than 75% corresponding to a 430nm wave band.
3. The imaging lens group according to claim 1, wherein an influence rate dng/dt of a unit temperature on a unit refractive index when the glass aspherical lens is at least one of the first lens to the fifth lens and an influence rate dni/dt of a unit temperature on a unit refractive index of the sixth lens satisfy | dng/dt |/| dni/dt | < 0.1.
4. An imaging lens group according to any one of claims 1 to 3, wherein a refractive index Ng of the glass aspherical lens satisfies 1.5 Ng 2.0.
5. An imaging lens group according to any one of claims 1 to 3, wherein-0.6 < f/fg <1.2 is satisfied between an effective focal length f of the imaging lens group and an effective focal length fg of the glass aspherical lens.
6. The imaging lens group of claim 5 wherein 0< R1/R4<1.0 is satisfied between the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R4 of the image-side surface of the second lens.
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| US16/273,447 US11693214B2 (en) | 2017-09-18 | 2019-02-12 | Imaging lens assembly |
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| JP6709564B2 (en) | 2017-11-01 | 2020-06-17 | カンタツ株式会社 | Imaging lens |
| CN108627955A (en) * | 2018-05-15 | 2018-10-09 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN114740597B (en) * | 2022-03-23 | 2023-08-08 | 江西晶超光学有限公司 | Optical lens, camera module and electronic equipment |
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| CN103399392A (en) * | 2013-08-20 | 2013-11-20 | 哈尔滨工业大学 | Large-viewing-field and high-precision star sensor optical system |
| JP2015060005A (en) * | 2013-09-17 | 2015-03-30 | 株式会社リコー | Image reading lens, image reading device, and image forming apparatus |
| TW201533470A (en) * | 2015-01-23 | 2015-09-01 | 玉晶光電股份有限公司 | Mobile device and optical imaging lens thereof |
| CN105278079A (en) * | 2015-05-28 | 2016-01-27 | 瑞声声学科技(深圳)有限公司 | Camera lens |
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| CN103399392A (en) * | 2013-08-20 | 2013-11-20 | 哈尔滨工业大学 | Large-viewing-field and high-precision star sensor optical system |
| JP2015060005A (en) * | 2013-09-17 | 2015-03-30 | 株式会社リコー | Image reading lens, image reading device, and image forming apparatus |
| TW201533470A (en) * | 2015-01-23 | 2015-09-01 | 玉晶光電股份有限公司 | Mobile device and optical imaging lens thereof |
| CN105278079A (en) * | 2015-05-28 | 2016-01-27 | 瑞声声学科技(深圳)有限公司 | Camera lens |
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