CN112558269B - Lens group for optical lens and optical lens - Google Patents
Lens group for optical lens and optical lens Download PDFInfo
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- CN112558269B CN112558269B CN201910913176.9A CN201910913176A CN112558269B CN 112558269 B CN112558269 B CN 112558269B CN 201910913176 A CN201910913176 A CN 201910913176A CN 112558269 B CN112558269 B CN 112558269B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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Abstract
The lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are coaxially arranged in sequence from an object side to an image side along an optical axis of the optical lens, wherein the fourth lens is a negative lens, the object side surface of the fourth lens is a concave surface, the object side surface and the image side surface of the fourth lens are both aspheric surfaces, and the surface sagittal is not more than 0.3 mm; the fifth lens is a positive lens, the image side surface of the fifth lens is a convex surface, the object side surface and the image side surface of the fifth lens are both aspheric surfaces, and the surface sagittal is not more than 0.4 mm; the sixth lens element is a negative lens element, the object-side surface of the sixth lens element is aspheric, the image-side surface of the sixth lens element is concave and aspheric, the image-side surface of the sixth lens element has at least one inflection point, and the sagittal planes of the object-side surface and the image-side surface are not greater than 0.5 mm. Through the technical scheme, the lens in the lens group for the optical lens is convenient to process.
Description
Technical Field
The present disclosure relates to the field of imaging lens technology, and in particular, to a lens group for an optical lens and an optical lens.
Background
With the rapid development of smart phone technology, the functions of mobile phones have not only been limited to traditional communication, but also the photographing function has been widely applied, so that people have an ever-increasing demand for optical lenses, and optical lenses with high resolution, low aberration, small size and light weight are often more popular with consumers.
The lens in the optical lens can change the optical characteristics of the optical system by changing the shape and the refractive index of the lens, but in the optimization process of the lens, the surface shape of the lens is often changed greatly, so that the lens is not easy to process or the processing tolerance is too large to meet the requirement, and stray light is easily generated in the processing process, so that the photographing effect of the optical lens is deteriorated.
Disclosure of Invention
An object of the present disclosure is to provide a lens group for an optical lens and an optical lens, in which lenses are easy to process.
In order to achieve the above object, the present disclosure provides a lens group for an optical lens, the lens group including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens coaxially arranged in order from an object side to an image side along an optical axis of the optical lens, wherein,
the first lens is a positive lens, the object side surface of the first lens is a convex surface,
the second lens is a negative lens, the image side surface of the second lens is a concave surface,
the third lens is a positive lens, the image side surface of the third lens is a convex surface,
the fourth lens is a negative lens, the object-side surface of the fourth lens is a concave surface and is an aspheric surface, the image-side surface of the fourth lens is an aspheric surface, and the surface sagittal vectors of the object-side surface and the image-side surface of the fourth lens are not more than 0.3mm,
the fifth lens is a positive lens, the object-side surface of the fifth lens is an aspheric surface, the image-side surface of the fifth lens is a convex surface and is an aspheric surface, the surface sagittal vectors of the object-side surface and the image-side surface of the fifth lens are not more than 0.4mm,
the sixth lens element is a negative lens element, the object-side surface of the sixth lens element is aspheric, the image-side surface of the sixth lens element is concave and aspheric, the image-side surface of the sixth lens element has at least one inflection point, and the sagittal planes of the object-side surface and the image-side surface of the sixth lens element are not greater than 0.5 mm.
Optionally, the focal length f of the lens group ranges from 3.4 mm to 3.6 mm;
wherein the content of the first and second substances,
the image side surface of the first lens is a concave surface or a convex surface, and the focal power psi 1 of the first lens is 0.5-0.8;
the object side surface of the second lens is a convex surface or a concave surface, and the focal power phi 2 of the second lens ranges from-1 to-0.5;
the object side surface of the third lens is a concave surface or a convex surface, and the focal power psi 3 of the third lens is 1-1.5;
the image side surface of the fourth lens is a convex surface, and the focal power psi 4 of the fourth lens ranges from-2.5 to-2;
the object side surface of the fifth lens is a concave surface, and the focal power psi 5 of the fifth lens is in the range of 0.5-1;
the object side surface of the sixth lens is a concave surface, the object side surface of the sixth lens is provided with at least one inflection point, and the focal power phi 6 of the sixth lens ranges from-0.6 to-0.4.
Optionally, both the object-side surface and the image-side surface of the first lens are spherical surfaces;
the object side surface and the image side surface of the second lens are both aspheric surfaces;
the object-side surface and the image-side surface of the third lens are both aspheric surfaces.
Alternatively,
the thickness of the first lens is 0.40 to 0.50mm,
the thickness of the second lens is 0.20-0.35 mm,
the thickness of the third lens is 0.45-0.55 mm,
the thickness of the fourth lens is 0.25-0.35 mm,
the thickness of the fifth lens is 0.40-0.55 mm,
the thickness of the sixth lens is 0.20-0.30 mm.
Alternatively,
the air space between the first lens and the second lens is 0.053-0.100 mm,
an air space between the second lens and the third lens is 0.200 to 0.382mm,
the air space between the third lens and the fourth lens is 0.100-0.200 mm,
the air space between the fourth lens and the fifth lens is 0.100-0.130 mm,
and the air space between the fifth lens and the sixth lens is 0.500-0.766 mm.
Alternatively,
the first lens is made of sapphire glass with the refractive index of 1.76-1.78 and the Abbe number of 32.0-35.0;
the second lens is made of a plastic material with the refractive index of 1.66-1.67 and the Abbe number of 19.2-20.4;
the third lens is made of a plastic material with the refractive index of 1.53-1.55 and the Abbe number of 55.0-57.0;
the fourth lens is made of a plastic material with the refractive index of 1.66-1.67 and the Abbe number of 19.2-20.4;
the fifth lens is made of a plastic material with the refractive index of 1.62-1.64 and the Abbe number of 22.0-23.2;
the sixth lens is made of a plastic material with a refractive index of 1.62-1.64 and an Abbe number of 22.0-23.2.
The present disclosure also provides an optical lens provided with the above lens group for an optical lens.
Optionally, the optical lens includes an aperture stop located on an object side of the first lens, the first lens object side surface serving as an aperture stop surface.
Optionally, the total length of the optical lens is 4.45mm to 4.55 mm.
Optionally, the optical lens includes an optical filter disposed on an image side of the sixth lens, and an air space between the optical filter and the sixth lens is 0.300-0.450 mm.
Optionally, the aperture value F of the optical lens ranges from 2.0 to 2.2, and the field angle ranges from 82 ° to 90 °.
Through the technical scheme, in the lens group for the optical lens provided by the disclosure, the surface arc vector of the lens with the larger change of partial surface type in the optical lens group is controlled, namely, the surface arc vectors of the object side surface of the fourth lens and the image side surface of the fourth lens are controlled to be not more than 0.3mm, the surface arc vectors of the object side surface of the fifth lens and the image side surface of the fifth lens are controlled to be not more than 0.4mm, and the surface arc vectors of the object side surface of the sixth lens and the image side surface of the sixth lens are controlled to be not more than 0.5mm, so that the fourth lens, the fifth lens and the sixth lens can be processed, and the lens group has smaller processing tolerance so as to be convenient for processing, and therefore, the actual production processing requirement and the assembly requirement can be met. In addition, the object side surface and the image side surface of the fourth lens, the fifth lens and the sixth lens are aspheric surfaces, the aspheric surface design has a better curvature radius, good aberration correction can be maintained, and the performance required by the optical lens can be obtained.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 schematically illustrates a structural diagram of an optical lens provided according to an embodiment of the present disclosure, in which a lens group for an optical lens provided by an embodiment of the present disclosure is illustrated;
fig. 2 is a Modulation Transfer Function (MTF) graph of an optical lens provided according to an embodiment of the present disclosure;
FIG. 3 is a dot-column diagram of an optical lens provided in accordance with an embodiment of the present disclosure;
FIG. 4 is a field curvature and distortion plot for an optical lens provided in accordance with an embodiment of the present disclosure;
fig. 5 is an axial aberration diagram of an optical lens provided according to an embodiment of the present disclosure.
Description of the reference numerals
L1-first lens, L2-second lens, L3-third lens, L4-fourth lens, L5-fifth lens, L6-sixth lens, S11-first lens object side, S12-first lens image side, S21-second lens object side, S22-second lens image side, S31-third lens object side, S32-third lens image side, S41-fourth lens object side, S42-fourth lens image side, S51-fifth lens object side, S52-fifth lens image side, S61-sixth lens object side, S62-sixth lens image side, F1-filter.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
According to an embodiment of the present disclosure, there is provided a lens group for an optical lens, as shown in fig. 1, the lens group for an optical lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6 coaxially arranged in sequence from an object side to an image side along an optical axis (i.e., a main optical axis) of the optical lens, wherein the first lens L1 is a positive lens, the object side surface S11 of the first lens is a convex surface, the second lens L2 is a negative lens, the image side surface S22 of the second lens is a concave surface, the third lens L3 is a positive lens, the side surface S32 of the third lens is a convex surface, the fourth lens L4 is a negative lens, the object side surface S41 of the fourth lens is a concave surface and is an aspheric surface, the image side surface S42 of the fourth lens and the object side surfaces S41 and S42 of the fourth lens are all aspheric surfaces greater than 0.3mm, the fifth lens element L5 is a positive lens element, the object-side surface S51 is an aspheric surface, the image-side surface S52 is a convex surface and is an aspheric surface, the sagittal planes of the object-side surface S51 and the image-side surface S52 of the fifth lens element are not greater than 0.4mm, the sixth lens element L6 is a negative lens element, the object-side surface S61 of the sixth lens element is an aspheric surface, the image-side surface S62 of the sixth lens element is a concave surface and is an aspheric surface, the image-side surface S62 of the sixth lens element has at least one inflection point, and the sagittal planes of the object-side surface S61 and the image-side surface S62 of the sixth lens element are not greater than 0.5 mm.
Through the technical scheme, in the lens group for the optical lens provided by the disclosure, by controlling the surface sagittal of the lens with a large surface type change in the optical lens group, that is, by controlling the surface sagittal of each of the fourth lens object-side surface S41 and the fourth lens image-side surface S42 to be not greater than 0.3mm, the surface sagittal of each of the fifth lens object-side surface S51 and the fifth lens image-side surface S52 to be not greater than 0.4mm, and the surface sagittal of each of the sixth lens object-side surface S61 and the sixth lens image-side surface S62 to be not greater than 0.5mm, the fourth lens L4, the fifth lens L5 and the sixth lens L6 can be machined, and have a small machining tolerance so as to facilitate machining, so that the actual production machining requirements and the assembly requirements can be met. In addition, the object-side surface and the image-side surface of the fourth lens L4, the fifth lens L5, and the sixth lens L6 are aspheric, the aspheric design has a better curvature radius, and good aberration correction can be maintained, so as to obtain the performance required by the optical lens, in addition, the aspheric design of the fourth lens L4, the fifth lens L5, and the sixth lens L6 can make the sharpness better and the resolution higher, and is also beneficial to the miniaturization design of the optical lens, and meanwhile, the control of the surface sagittal of the fourth lens L4, the fifth lens L5, and the sixth lens L6 can also avoid stray light occurring in the processing process, so as to ensure the imaging effect of the optical lens.
It should be noted that the "plane sagittal" in the present disclosure refers to the axial height of the lens surface in the direction of the principal optical axis. For example, in the present disclosure, the sagittal plane of each of the fourth lens object-side surface S41 and the fourth lens image-side surface S42 is not greater than 0.3mm, i.e., the axial height of the fourth lens object-side surface S41 in the main optical axis direction is not greater than 0.3, and the axial height of the fourth lens image-side surface S42 in the main optical axis direction is not greater than 0.3 mm.
In the specific implementation manner provided by the disclosure, the focal length f of the lens group for the optical lens can range from 3.4 mm to 3.6 mm; the first lens image-side surface S12 may be a concave surface, the first lens image-side surface S12 may be a convex surface, and the focal power ψ 1 of the first lens L1 may be in a range of 0.5 to 0.8; the second lens object-side surface S21 may be a convex surface, the second lens object-side surface S21 may also be a concave surface, and the focal power ψ 2 of the second lens L2 may range from-1 to-0.5; the third lens object-side surface S31 may be a concave surface, the third lens object-side surface S31 may also be a convex surface, and the focal power ψ 3 of the third lens L3 may range from 1 to 1.5; the fourth lens image-side surface S42 may be a convex surface, and the focal power ψ 4 of the fourth lens L4 may range from-2.5 to-2; the fifth lens object side surface S51 can be a concave surface, and the focal power psi 5 of the fifth lens L5 can be in the range of 0.5-1; the sixth lens object-side surface S61 is concave and the sixth lens object-side surface S61 has at least one inflection point, and the refractive power ψ 6 of the sixth lens L6 is in the range of-0.6 to-0.4. In the lens group for the optical lens provided by the disclosure, the focal power of each lens is reasonably distributed according to the imaging requirement, so that the imaging quality of the optical lens can be effectively prevented from being influenced by the generation of overlarge aberration.
With reference to fig. 1, the fifth lens image-side surface S52 has an inflection point such that the fifth lens image-side surface S52 changes from convex at a paraxial region to concave at a peripheral region; the sixth lens object-side surface S61 has a inflection point such that the sixth lens object-side surface S61 has a concave-to-convex transition from near the optical axis to the periphery; the sixth lens image-side surface S62 has an inflection point, such that the sixth lens image-side surface S62 has a concave-convex change from a paraxial region to a peripheral region, thereby effectively eliminating off-axis field aberrations and improving image quality.
In the specific embodiment provided by the present disclosure, both the first lens object-side surface S11 and the first lens image-side surface S12 may be spherical surfaces, and the spherical surface design is simple and easy to process, that is, the first lens L1 is easy to process, thereby further reducing the processing difficulty of the lens group; the second lens object-side surface S21 and the second lens image-side surface S22 may both be aspheric; the third lens object-side surface S31 and the third lens image-side surface S32 may both be aspheric. The aspherical designs of the second lens L2 and the third lens L3 have better radii of curvature, can maintain good aberration correction to achieve the performance required for an optical lens including such a lens group, and further, the aspherical designs of the second lens L2 and the third lens L3 can make sharpness better and resolution higher while also facilitating miniaturization design of the optical lens.
In a specific embodiment provided by the present disclosure, the thickness of the first lens L1 may be 0.40 to 0.50mm, the thickness of the second lens L2 may be 0.20 to 0.35mm, the thickness of the third lens L3 may be 0.45 to 0.55mm, the thickness of the fourth lens L4 may be 0.25 to 0.35mm, the thickness of the fifth lens L5 may be 0.40 to 0.55mm, and the thickness of the sixth lens L6 may be 0.20 to 0.30 mm. An air interval between the first lens L1 and the second lens L2 may be 0.053 to 0.100mm, an air interval between the second lens L2 and the third lens L3 may be 0.200 to 0.382mm, an air interval between the third lens L3 and the fourth lens L4 may be 0.100 to 0.200mm, an air interval between the fourth lens L4 and the fifth lens L5 may be 0.100 to 0.130mm, and an air interval between the fifth lens L5 and the sixth lens L6 may be 0.500 to 0.766 mm. By reasonably setting the thicknesses of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 and the air space between two adjacent lenses, on one hand, the lens group can be conveniently assembled, and on the other hand, the structure of the lens group can be more compact.
In the specific embodiment provided by the present disclosure, the first lens L1 may be made of sapphire glass with a refractive index of 1.76-1.78 and an abbe number of 32.0-35.0, and the sapphire glass has high hardness and good wear resistance, so that the first lens L1 made of sapphire glass can prevent the first lens L1 from being scratched or worn on one hand, and on the other hand, an additional lens protection sheet is not required to be added, so that the weight and thickness of the optical lens can be reduced; the second lens L2 can be made of a plastic material with the refractive index of 1.66-1.67 and the Abbe number of 19.2-20.4; the third lens L3 can be made of a plastic material with the refractive index of 1.53-1.55 and the Abbe number of 55.0-57.0; the fourth lens L4 can be made of a plastic material with a refractive index of 1.66-1.67 and an Abbe number of 19.2-20.4; the fifth lens L5 can be made of a plastic material with the refractive index of 1.62-1.64 and the Abbe number of 22.0-23.2; the sixth lens L6 can be made of a plastic material with a refractive index of 1.62-1.64 and an Abbe number of 22.0-23.2. The second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are made of plastic materials, so that the imaging requirement is met, and meanwhile, the cost of the whole optical lens can be reduced.
The present disclosure also provides an optical lens, which is provided with the lens assembly for an optical lens, and therefore, may have a high imaging pixel, and when a chip of 1/3 specifications is mounted and the size of a single pixel is 1.0 micron by 1.0 micron, the pixel of the optical lens may reach 1600 ten thousand.
In the specific implementation manner provided by the present disclosure, the optical lens may include an aperture stop, which may be located on the object side of the first lens L1, the first lens object-side surface S11 may be used as an aperture stop surface, and the aperture stop is disposed on the object side of the first lens L1, so that the marginal chief ray angle of the lens may be easily controlled, and the relative illumination intensity may be improved, thereby ensuring the imaging quality of the optical lens.
In the specific implementation mode provided by the disclosure, the total length of the optical lens can be 4.45-4.55 mm.
In an embodiment provided by the present disclosure, the optical lens includes a filter F1 disposed on an image side of the sixth lens L6, the thickness of the filter F1 is 0.21 ± 0.01mm, and an air space between the filter F1 and the sixth lens L6 is 0.300-0.450 mm, so that the structure of the entire lens module is more compact.
In the specific embodiment provided by the present disclosure, the range of the aperture value F of the optical lens may be 2.0 to 2.2, the range of the field angle may be 82 to 90 °, and a large aperture design is adopted to ensure the light incident amount, so that the lens can present a clear shooting effect without an external light source under a low illumination condition.
The present disclosure is further illustrated by the following examples, but is not limited thereby. The optical lens of the embodiment of the present disclosure adopts ZEMAX software for simulation.
Examples
As shown in fig. 1, the lens module of the present embodiment includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter F1 coaxially arranged in sequence from an object side to an image side along an optical axis of the optical lens. In this embodiment, the specific parameters and settings of the optical lens are as follows:
the first lens L1 is a positive lens, the first lens object-side surface S11 and the first lens image-side surface S12 are both spherical surfaces, the first lens object-side surface S11 is a convex surface, the first lens image-side surface S12 is a concave surface, the first lens L1 has an optical power ψ 1 of 0.77, the first lens L1 has a thickness of 0.43mm, and the first lens L1 is made of sapphire glass having a refractive index of 1.76 and an abbe number of 32.
The second lens L2 is a negative lens, the second lens object-side surface S21 and the second lens image-side surface S22 are both aspheric, the second lens object-side surface S21 is a convex surface, the second lens image-side surface S22 is a concave surface, the second lens L2 has an optical power ψ 2 of-0.65, the second lens L2 has a thickness of 0.28mm, and the second lens L2 is made of a plastic material having a refractive index of 1.67 and an abbe number of 19.2.
The third lens L3 is a positive lens, the third lens object-side surface S31 and the third lens image-side surface S32 are both aspheric, the third lens object-side surface S31 is a concave surface, the third lens image-side surface S32 is a convex surface, the third lens L3 has an optical power ψ 3 of 1.42, the third lens L3 has a thickness of 0.47mm, and the third lens L3 is made of a plastic material having a refractive index of 1.54 and an abbe number of 55.9.
The fourth lens L4 is a negative lens, the fourth lens object-side surface S41 is a concave surface and an aspheric surface, the fourth lens image-side surface S42 is a convex surface and an aspheric surface, and the sagittal planes of the fourth lens object-side surface S41 and the fourth lens image-side surface S42 are 0.30mm and 0.26mm, respectively, the optical power ψ 4 of the fourth lens L4 is-2.32, the thickness of the fourth lens L4 is 0.28mm, and the fourth lens L4 is made of a plastic material having a refractive index of 1.67 and an abbe number of 19.2.
The fifth lens L5 is a positive lens, the fifth lens object-side surface S51 is a concave surface and an aspheric surface, the fifth lens image-side surface S52 is a convex surface and an aspheric surface, the sagittal planes of the fifth lens object-side surface S51 and the fifth lens image-side surface S52 are 0.14mm and 0.23mm, respectively, the optical power ψ 5 of the fifth lens L5 is 0.63, the thickness of the fifth lens L5 is 0.44mm, and the fifth lens L5 is made of a plastic material having a refractive index of 1.63 and an abbe number of 23.2.
The sixth lens L6 is a negative lens, the sixth lens object-side surface S61 is a concave surface and an aspheric surface, the sixth lens image-side surface S62 is a concave surface and an aspheric surface, the sixth lens object-side surface S61 and the sixth lens image-side surface S62 have two points of inflection, the sagittal planes of the sixth lens object-side surface S61 and the sixth lens image-side surface S62 are 0.34mm and 0.30mm, respectively, the power ψ 6 of the sixth lens L6 is-0.55, the thickness of the sixth lens L6 is 0.28mm, and the sixth lens L6 is made of a plastic material having a refractive index of 1.63 and an abbe number of 23.2.
The filter F1 was 0.21mm thick, and the filter F1 was made of BK7 material having a refractive index of 1.52 and an abbe number of 64.2.
The air space between the first lens L1 and the second lens L2 was 0.05mm, the air space between the second lens L2 and the third lens L3 was 0.38mm, the air space between the third lens L3 and the fourth lens L4 was 0.10mm, the air space between the fourth lens L4 and the fifth lens L5 was 0.13mm, the air space between the fifth lens L5 and the sixth lens L6 was 0.76mm, and the air space between the filter F1 and the sixth lens L6 was 0.45 mm.
The focal length F of the lens group for the optical lens is 3.6mm, the total length of the optical lens provided with the lens group for the optical lens is 4.51mm, the aperture value F of the optical lens is 2.0, and the angle of view is 82 degrees. Fig. 2 is a modulation transfer function diagram of the optical lens of the above embodiment. The modulation transfer function diagram comprehensively reflects the imaging quality of the lens, the curve shape of the modulation transfer function diagram is smoother, and the numerical value is larger, so that the reflected imaging quality is better. As shown in fig. 2, the modulation transfer function values are all greater than 0.5 at a resolution of 130 line pairs/mm. Astigmatism in the meridional and sagittal directions is also small.
Fig. 3 is a dot array diagram of the optical lens of the above embodiment. As shown in FIG. 3, the root mean square of the scattered spots on the image surface is small, the scattered spots are mainly distributed within 1.5 microns of the Airy spots and are close to the diffraction limit, and the imaging design requirements are met.
Fig. 4 is a field curvature and distortion diagram of the optical lens of the above embodiment. As shown in fig. 4, the sizes of the meridional field curvature and the sagittal field curvature of the lens are both smaller than 0.5mm, the distortion of the lens is controlled within 1%, the deformation of the imaging cannot be seen, and the design requirement is met.
Fig. 5 is an axial aberration diagram of the optical lens of the above embodiment. As shown in fig. 5, it can be clearly seen from the axial aberration diagrams of the light beams with three wavelengths that the axial aberration of the lens is smaller and the distribution is more uniform, so that it can be demonstrated that the material matching of the lens group for an optical lens of the present disclosure is more reasonable and the axial aberration of the lens as a whole is smaller.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (11)
1. A lens group for an optical lens, characterized in that the lens group comprises a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4), a fifth lens (L5) and a sixth lens (L6) which are coaxially arranged in this order from an object side to an image side along an optical axis of the optical lens, wherein,
the first lens (L1) is a positive lens, the first lens object side surface (S11) is a convex surface,
the second lens (L2) is a negative lens, the image side surface (S22) of the second lens is a concave surface,
the third lens (L3) is a positive lens, the image side surface (S32) of the third lens is a convex surface,
the fourth lens (L4) is a negative lens, the object side surface (S41) of the fourth lens is a concave surface and is an aspheric surface, the image side surface (S42) of the fourth lens is an aspheric surface, and the surface sagittal of the object side surface (S41) and the surface sagittal of the image side surface (S42) of the fourth lens are not more than 0.3mm,
the fifth lens (L5) is a positive lens, the object side surface (S51) of the fifth lens is aspheric, the image side surface (S52) of the fifth lens is convex and aspheric, the surface sagittal of the object side surface (S51) and the surface sagittal of the image side surface (S52) of the fifth lens are not more than 0.4mm,
the sixth lens (L6) is a negative lens, the sixth lens object-side surface (S61) is aspheric, the sixth lens image-side surface (S62) is concave and aspheric, the sixth lens image-side surface (S62) has at least one inflection point, and the sagittal planes of the sixth lens object-side surface (S61) and the sixth lens image-side surface (S62) are not greater than 0.5 mm.
2. A lens group for an optical lens according to claim 1, wherein the focal length f of the lens group is in the range of 3.4 to 3.6 mm;
wherein the content of the first and second substances,
the image side surface (S12) of the first lens is concave or convex, and the optical power psi of the first lens (L1)1The range of (A) is 0.5 to 0.8;
the object side surface (S21) of the second lens is convex or concave, and the focal power psi of the second lens (L2)2The range of (a) is-1 to-0.5;
the object side surface (S31) of the third lens is concave or convex, and the focal power psi of the third lens (L3)3The range of (1) to (1.5);
the image side surface (S42) of the fourth lens is convex, and the focal power psi of the fourth lens (L4)4The range of (a) is-2.5 to-2;
the object side surface (S51) of the fifth lens is a concave surface, and the optical power psi of the fifth lens (L5)5The range of (1) is 0.5 to 1;
the sixth lens object side surface (S61) is concave and the sixth lens object side surface (S61) has at least one point of inflection, the sixth lens (L6) having an optical power (ψ)6) The range of (A) is-0.6 to-0.4.
3. A lens group for an optical lens according to claim 2, wherein the first lens object side surface (S11) and the first lens image side surface (S12) are both spherical surfaces;
both the second lens object-side surface (S21) and the second lens image-side surface (S22) are aspheric;
the third lens object-side surface (S31) and the third lens image-side surface (S32) are both aspheric.
4. A lens group for an optical lens according to claim 1,
the thickness of the first lens (L1) is 0.40-0.50 mm,
the thickness of the second lens (L2) is 0.20-0.35 mm,
the thickness of the third lens (L3) is 0.45-0.55 mm,
the thickness of the fourth lens (L4) is 0.25-0.35 mm,
the thickness of the fifth lens (L5) is 0.40-0.55 mm,
the thickness of the sixth lens (L6) is 0.20-0.30 mm.
5. A lens group for an optical lens according to claim 1,
the air space between the first lens (L1) and the second lens (L2) is 0.053-0.100 mm,
an air space between the second lens (L2) and the third lens (L3) is 0.200 to 0.382mm,
an air space between the third lens (L3) and the fourth lens (L4) is 0.100 to 0.200mm,
an air space between the fourth lens (L4) and the fifth lens (L5) is 0.100 to 0.130mm,
an air space between the fifth lens (L5) and the sixth lens (L6) is 0.500-0.766 mm.
6. A lens group for an optical lens according to claim 1,
the first lens (L1) is made of sapphire glass with the refractive index of 1.76-1.78 and the Abbe number of 32.0-35.0;
the second lens (L2) is made of a plastic material with the refractive index of 1.66-1.67 and the Abbe number of 19.2-20.4;
the third lens (L3) is made of a plastic material with the refractive index of 1.53-1.55 and the Abbe number of 55.0-57.0;
the fourth lens (L4) is made of a plastic material with the refractive index of 1.66-1.67 and the Abbe number of 19.2-20.4;
the fifth lens (L5) is made of a plastic material with the refractive index of 1.62-1.64 and the Abbe number of 22.0-23.2;
the sixth lens (L6) is made of a plastic material with a refractive index of 1.62-1.64 and an Abbe number of 22.0-23.2.
7. An optical lens provided with the lens group for an optical lens according to claims 1 to 6.
8. An optical lens according to claim 7, characterized in that the optical lens comprises an aperture stop located on the object side of the first lens (L1), the first lens object side surface (S11) serving as an aperture stop surface.
9. An optical lens according to claim 7, characterized in that the total length of the optical lens is 4.45mm to 4.55 mm.
10. An optical lens according to claim 7, characterized in that the optical lens comprises a filter (F1) disposed on the image side of the sixth lens (L6), the air space between the filter (F1) and the sixth lens (L6) being 0.300-0.450 mm.
11. The optical lens according to claim 7, wherein an aperture value F of the optical lens is in a range of 2.0 to 2.2, and a field angle is in a range of 82 to 90 °.
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| CN201910913176.9A CN112558269B (en) | 2019-09-25 | 2019-09-25 | Lens group for optical lens and optical lens |
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| US20220381955A1 (en) * | 2021-05-28 | 2022-12-01 | Zebra Technologies Corporation | Moving front lens group mechanically located to fixed rear lens group |
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