CN112904582A - Optical lens assembly, optical module and equipment - Google Patents

Optical lens assembly, optical module and equipment Download PDF

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Publication number
CN112904582A
CN112904582A CN202110188969.6A CN202110188969A CN112904582A CN 112904582 A CN112904582 A CN 112904582A CN 202110188969 A CN202110188969 A CN 202110188969A CN 112904582 A CN112904582 A CN 112904582A
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China
Prior art keywords
optical
lens
lens element
optical lens
lens group
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CN202110188969.6A
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Chinese (zh)
Inventor
谢冠群
姚琪
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Nanchang OFilm Tech Co Ltd
Nanchang OFilm Optoelectronics Technology Co Ltd
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Nanchang OFilm Optoelectronics Technology Co Ltd
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Priority to CN202110188969.6A priority Critical patent/CN112904582A/en
Publication of CN112904582A publication Critical patent/CN112904582A/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0927—Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/095—Refractive optical elements
    • G02B27/0955—Lenses

Abstract

The embodiment of the application discloses an optical lens group, an optical module and equipment, wherein the optical lens group comprises at most two lenses, the optical lens group comprises a first lens and a second lens, the first lens has negative refractive power, the object side surface of the first lens is a free-form surface, and the object side surface of the first lens at a paraxial region is a concave surface; the image side surface of the first lens element is a free-form surface, and the image side surface of the first lens element is concave at a paraxial region. The optical lens group of this application embodiment all sets up to free-form surface through the object side face with first lens and like the side face, and through the injecing to the object side face of first lens and the face type like the side face for light is through this optical lens group back energy can distribute more evenly, and light utilization efficiency is higher.

Description

Optical lens assembly, optical module and equipment
Technical Field
The application relates to the technical field of optical imaging, in particular to an optical lens group, an optical module and equipment.
Background
With the development of science and technology, people have higher and higher requirements on optical structures. However, the existing optical structure is difficult to meet the use requirements of people, for example, the existing optical structure cannot achieve more uniform distribution of light, so that the optical structure has the defects of poor imaging effect when being applied to the imaging field, or limited detection range when being applied to the detection field, and the like.
Disclosure of Invention
The embodiment of the application provides an optical lens group, an optical module and equipment, can make more even of light through this optical lens group back energy distribution, light utilization efficiency is higher. The technical scheme is as follows;
in a first aspect, an embodiment of the present application provides an optical lens group, including at most two lenses, the optical lens group including:
the first lens element with negative refractive power has a free-form surface on an object-side surface thereof, and the object-side surface thereof is concave at a paraxial region thereof; the image side surface of the first lens element is a free-form surface, and the image side surface of the first lens element is concave at a paraxial region.
The optical lens group of this application embodiment all sets up to free-form surface through the object side face with first lens and like the side face, and through the injecing to the object side face of first lens and the face type like the side face for light is through this optical lens group back energy can distribute more evenly, and light utilization efficiency is higher.
In some of these embodiments, further comprising:
the second lens element is disposed on an image side of the first lens element along the optical axis, and has a negative refractive power, and an object-side surface of the second lens element at a paraxial region thereof is concave.
Based on above-mentioned embodiment, through setting optical lens group to still include the second lens for the light after first lens can also be further through this second lens effect, so that more even of light distribution, improve light utilization efficiency.
In some of these embodiments, the optical lens group satisfies the following conditional expression:
-2.56≤EFL/TTL≤-0.16
wherein, EFL is a focal length of the optical lens group, and TTL is a distance on the optical axis from an object-side surface of the first lens element to an image-side surface of the second lens element.
Based on the above embodiment, by reasonably limiting the ratio of the focal length of the optical lens group to the distance from the object side surface of the first lens element to the image side surface of the second lens element on the optical axis, the total length of the optical lens group can be controlled while the field angle range of the optical lens group is satisfied and the light distribution is uniform, so that the optical lens group is more miniaturized.
In some of these embodiments, the optical lens group satisfies the following conditional expression:
0.13≤CT1/TTL≤1
wherein, CT1TTL is a distance on the optical axis from an object-side surface of the first lens element to an image-side surface of the second lens element, where TTL is a thickness of the first lens element on the optical axis.
Based on the above embodiment, the distribution of the optical lens group can be more compact and the optical lens group can be more miniaturized by reasonably limiting the ratio of the thickness of the first lens element on the optical axis to the distance from the object side surface of the first lens element to the image side surface of the second lens element on the optical axis.
In some of these embodiments, the optical lens group satisfies the following conditional expression:
0≤CT2/CT1≤3.23
wherein, CT1Is the thickness of the first lens on the optical axis, CT2Is the thickness of the second lens on the optical axis.
Based on the above embodiment, through the reasonable limit to the ratio of the thickness of the first lens on the optical axis to the thickness of the second lens on the optical axis, the first lens and the second lens can work better in cooperation, so that the light passing through the optical lens group can be distributed more uniformly.
In some of these embodiments, the optical lens group satisfies the following conditional expression:
0≤G12/TTL≤0.47
wherein G is12The TTL is an air interval between the first lens element and the second lens element on the optical axis, and is a distance from an object-side surface of the first lens element to an image-side surface of the second lens element on the optical axis.
Based on above-mentioned embodiment, through the reasonable limited to the air interval on first lens and second lens and the optical axis, the object side of first lens to the image side of second lens and the distance on the optical axis ratio of distance, can guarantee that light distributes evenly simultaneously, make to have reasonable air interval between two lenses, can avoid two lens bumps in the assembling process, can promote the equipment yield.
In some of these embodiments, the optical lens group satisfies the following conditional expression:
-2.74≤CT2/EFL≤0
wherein, CT2The EFL is a focal length of the optical lens assembly, and is a thickness of the second lens element on the optical axis.
Based on the above embodiment, through the reasonable limitation of the ratio of the thickness of the second lens on the optical axis to the focal length of the optical lens group, the processing requirement of the second lens can be reduced, the assembly yield of the optical lens group is improved, and the production cost is reduced.
In some of these embodiments, the optical lens group satisfies the following conditional expression:
-0.80≤RS1/CT1≤-0.42
wherein R isS1Is the radius of curvature of the object side surface of the first lens, CT1Is the thickness of the first lens on the optical axis.
Based on the above-mentioned embodiment, through the rationality of the radius of curvature to the object side surface of the first lens, the thickness of the first lens on the optical axis is decided, the degree of curvature of the object side surface of the first lens can be controlled, which is advantageous for the miniaturization of the optical module.
In some of these embodiments, the optical lens group satisfies the following conditional expression:
0.24≤CT1/ALT≤1
wherein, CT1The ALT is the sum of the thicknesses of all the lenses in the optical lens group on the optical axis.
Based on the above embodiment, the ratio of the thickness of the first lens on the optical axis to the sum of the thicknesses of all the lenses in the optical lens group on the optical axis is reasonably limited, so that the first lens can better cooperate with other lenses in the optical lens group, and the light passing through the optical lens group can be distributed more uniformly.
In a second aspect, an embodiment of the present application provides an optical module including any of the optical lens assemblies described above.
The optical module of this application embodiment, including foretell optical lens group, all set up to free-form surface through the object side face and the image side face with the first lens of optical lens group, and through the injecing to the object side face of first lens and the face type of image side face for light is through this optical lens group back energy can distribute more even, and light utilization efficiency is higher.
In a third aspect, an embodiment of the present application provides an apparatus including the optical module described above.
The equipment of this application embodiment, including the optical module who has above-mentioned optical lens group, all set up to free-form surface through the object side face and the image side face with the first lens of optical lens group, and through the injecing to the object side face of first lens and the face type of image side face for light is more even that energy can distribute behind this optical lens group, and light utilization efficiency is higher.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical lens assembly according to an embodiment of the present disclosure;
FIG. 2 is a diagram illustrating a distribution of light rays when the optical lens assembly of the present application is in use;
FIG. 3 is a graph of the energy distribution on a detection surface when a prior art optical structure is in use;
FIG. 4 is a diagram illustrating an energy distribution of a detection surface of an optical lens assembly according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an optical lens assembly provided in the second embodiment of the present application;
FIG. 6 is a diagram illustrating a distribution of light rays when the optical lens assembly provided in the second embodiment of the present application is in use;
FIG. 7 is a diagram illustrating an energy distribution of a detection surface when the optical lens assembly provided in the second embodiment of the present application is in use;
fig. 8 is a schematic structural diagram of an optical lens assembly provided in the third embodiment of the present application;
FIG. 9 is a diagram illustrating a distribution of light rays when the optical lens assembly provided in the third embodiment of the present application is in use;
FIG. 10 is a diagram illustrating an energy distribution on a detection surface when the optical lens assembly provided in the third embodiment of the present application is in use;
fig. 11 is a schematic structural diagram of an optical lens assembly provided in the fourth embodiment of the present application;
FIG. 12 is a diagram illustrating a distribution of light rays when the optical lens assembly provided in the fourth embodiment of the present application is in use;
FIG. 13 is a diagram illustrating an energy distribution on a detection surface when the optical lens assembly provided in the fourth embodiment of the present application is in use;
fig. 14 is a schematic structural diagram of an optical lens assembly provided in the fifth embodiment of the present application;
fig. 15 is a light distribution diagram of the optical lens assembly provided in the fifth embodiment of the present application in use;
fig. 16 is a diagram illustrating an energy distribution on a detection surface when the optical lens assembly provided in the fifth embodiment of the present application is used.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the application, as detailed in the appended claims.
With the development of science and technology, people have higher and higher requirements on optical structures. However, the existing optical structure is difficult to meet the use requirements of people, for example, the existing optical structure cannot achieve more uniform distribution of light, so that the optical structure has the defects of poor imaging effect when being applied to the imaging field, or limited detection range when being applied to the detection field, and the like. Accordingly, embodiments of the present application provide an optical lens assembly, an optical module and an apparatus, which aim to solve the above technical problems.
In a first aspect, an embodiment of the present application provides an optical lens assembly 100. The optical lens group 100 includes at most two lenses. Specifically, the optical lens assembly 100 can include a first lens element 110, the first lens element 110 has negative refractive power, an object-side surface of the first lens element 110 is a free-form surface, and an object-side surface of the first lens element 110 is concave at a paraxial region; the image-side surface of the first lens element 110 is a free-form surface, and the image-side surface of the first lens element 110 is concave at a paraxial region. The object side surface of the first lens 110 may be concave at the circumference, and the image side surface of the first lens 110 may be concave at the circumference. The object side surface of the lens is the surface of the lens facing the object plane, and the image side surface of the lens is the surface of the lens facing the image plane.
The optical lens group 100 of the embodiment of the present application sets the object side surface and the image side surface of the first lens element 110 as free-form surfaces, and defines the object side surface and the image side surface of the first lens element 110, so that the energy of light passing through the optical lens group 100 can be distributed more uniformly, and the light utilization efficiency is higher. By configuring the first lens element 110 with negative refractive power, the optical lens assembly 100 can have a wide angle.
In some embodiments, the optical lens assembly 100 further includes a second lens element 120, the second lens element 120 is disposed on the image side of the first lens element 110 along the optical axis, the second lens element 120 with negative refractive power has a concave object-side surface at a paraxial region of the second lens element 120. The optical lens assembly 100 further includes the second lens element 120, so that the light passing through the first lens element 110 can further pass through the second lens element 120, and the light is distributed more uniformly, thereby improving the light utilization efficiency. In the embodiment of the present application, the first lens element 110 is made of glass, and the second lens element 120 is made of glass. In other embodiments, the lenses may be made of other materials.
In some embodiments, the optical lens group 100 satisfies the following conditional expression: -2.56 ≦ EFL/TTL ≦ -0.16, where EFL is the focal length of the optical lens assembly 100, and TTL is the distance on the optical axis from the object-side surface of the first lens element 110 to the image-side surface of the second lens element 120. The ratio of the focal length of the optical lens assembly 100 to the distance from the object-side surface of the first lens element 110 to the image-side surface of the second lens element 120 on the optical axis is reasonably limited, so that the total length of the optical lens assembly 100 can be controlled while the field angle range of the optical lens assembly 100 is satisfied and the light distribution is uniform, thereby further miniaturizing the optical lens assembly 100.
In some embodiments, the optical lens group 100 satisfies the following conditional expression: 0.13 or less CT1TTL is less than or equal to 1, wherein, CT1TTL is a distance on the optical axis from an object-side surface of the first lens element 110 to an image-side surface of the second lens element 120, where TTL is a thickness of the first lens element 110 on the optical axis. The above-mentioned reasonable limitation to the ratio of the thickness of the first lens element 110 on the optical axis to the distance from the object-side surface of the first lens element 110 to the image-side surface of the second lens element 120 on the optical axis can make the distribution of the optical lens assembly 100 more compact, and make the optical lens assembly 100 more miniaturized.
In some embodiments, the optical lens group 100 satisfies the following conditional expression: 0 is less than or equal to CT2/CT1Less than or equal to 3.23, wherein, CT1Is the thickness of the first lens element 110 on the optical axis, CT2Is the thickness of the second lens 120 on the optical axis. The ratio of the thickness of the first lens element 110 on the optical axis to the thickness of the second lens element 120 on the optical axis is reasonably limited, so that the first lens element 110 and the second lens element 120 can better cooperate with each other, and the light passing through the optical lens assembly 100 can be distributed more uniformly.
In some embodiments, the optical lens group 100 satisfies the following conditional expression: g is not less than 012TTL is less than or equal to 0.47, wherein G12TTL is an air interval between the first lens element 110 and the second lens element 120 on the optical axis, and TTL is a distance between an object-side surface of the first lens element 110 and an image-side surface of the second lens element 120 on the optical axis. On the upper partThe reasonable limit of the ratio of the distance between the first lens 110 and the second lens 120 and the optical axis to the air space between the object side surface of the first lens 110 and the image side surface of the second lens 120 to the optical axis can ensure that the light is uniformly distributed and the reasonable air space is formed between the two lenses, so that the two lenses can be prevented from colliding in the assembling process, and the assembling yield can be improved.
In some embodiments, the optical lens group 100 satisfies the following conditional expression: -2.74 ≦ CT2/EFL is less than or equal to 0, wherein, CT2The thickness of the second lens element 120 on the optical axis is defined, and the EFL is the focal length of the optical lens assembly 100. The above-mentioned reasonable limit to the thickness of second lens 120 on the optical axis, the focal length of optical lens group 100's ratio can reduce the processing requirement of second lens 120, promotes optical lens group 100's equipment yield, reduction in production cost.
In some embodiments, the optical lens group 100 satisfies the following conditional expression: 0 is less than or equal to CT2/ALT ≤ 0.76, wherein CT2ALT is the sum of the thicknesses of all the lenses in the optical lens group 100 on the optical axis, which is the thickness of the second lens 120 on the optical axis. The above-mentioned through the reasonable limited to the ratio of the thickness of the second lens element 120 on the optical axis to the sum of the thicknesses of all the lens elements in the optical lens group 100 on the optical axis, make the second lens element 120 and other lens elements in the optical lens group 100 better work in conjunction, make the light passing through the optical lens group 100 can be distributed more evenly.
In some embodiments, the optical lens group 100 satisfies the following conditional expression: -0.80. ltoreq.RS1/CT1Less than or equal to-0.42, wherein RS1Is the radius of curvature of the object side surface of the first lens 110, CT1Is the thickness of the first lens element 110 on the optical axis. By appropriately determining the curvature radius of the object-side surface of the first lens element 110 and the thickness of the first lens element 110 on the optical axis, the degree of curvature of the object-side surface of the first lens element 110 can be controlled, which is advantageous for downsizing the optical module.
In some embodiments, the optical lens assembly 100 satisfies the following conditional expression：0.24≤CT1ALT ≦ 1, wherein CT1ALT is the sum of the thicknesses of all the lenses in the optical lens group 100 on the optical axis, which is the thickness of the first lens element 110 on the optical axis. The above-mentioned ratio of the thickness of the first lens element 110 on the optical axis to the sum of the thicknesses of all the lens elements in the optical lens assembly 100 on the optical axis is reasonably limited, so that the first lens element 110 can better cooperate with other lens elements in the optical lens assembly 100, and the light passing through the optical lens assembly 100 can be distributed more uniformly.
To reduce stray light and improve the imaging effect, the optical lens assembly 100 may further include a stop. The diaphragm may be an aperture diaphragm and/or a field diaphragm. The diaphragm may be located between the object plane and the image plane. For example, the diaphragms may be located: the image plane is located between the object side surface of the first lens 110 and the object plane, between the image side surface of the first lens 110 and the object side surface of the second lens 120, or between the image side surface of the second lens 120 and the image plane. In order to reduce the processing cost, an aperture stop may be provided on any one of the object-side surface of the first lens 110, the object-side surface of the second lens 120, the image-side surface of the first lens 110, and the image-side surface of the second lens 120. To achieve filtering of the non-operating wavelength bands, the optical lens assembly 100 may further include a filter element.
In a second aspect, an embodiment of the present application provides an optical module, which includes any of the optical lens assemblies described above. The optical module in the embodiment of the application can be a lens module and also can be a detection module. Specifically, when the optical module is a lens module, the optical module may include any of the optical lens groups, a lens barrel located at the periphery of the optical lens group, and a photosensitive element located at the image side of the optical lens group. When the optical module is a detection module, the optical module may include a light projection device and a light receiving device, the light projection device includes a light source and any optical lens group, the optical lens group is located on a light exit path of the light source, and the light receiving device is configured to receive a light beam reflected by the light projection device through an object.
The optical module of the embodiment of the application, including foretell optical lens group 100, all set up to free-form surface through the object side face and the image side face of first lens 110 with optical lens group 100, and through the injecing to the object side face and the face type of image side face of first lens 110 for light is more even that energy can distribute behind this optical lens group 100, and light utilization efficiency is higher.
In a third aspect, an embodiment of the present application provides an apparatus. The equipment comprises the optical module. The device may be a smartphone, a wearable device, a computer device, a television, a vehicle, a camera, a monitoring device, or the like.
The device of the embodiment of the present application includes a lens module having the above optical lens group 100 or a light detection device having the above optical lens group 100, and both the object-side surface and the image-side surface of the first lens 110 of the optical lens group 100 are set as free-form surfaces, and the object-side surface and the image-side surface of the first lens 110 are defined, so that the energy of light passing through the optical lens group 100 can be distributed more uniformly, and the light utilization efficiency is higher.
Several embodiments of the optical imaging lens assembly 100 will be described in detail with reference to specific parameters.
Detailed description of the preferred embodiment
Referring to fig. 1, an optical lens assembly 100 of the present embodiment includes a first lens element 110. The first lens element 110 with negative refractive power has a free-form object-side surface of the first lens element 110, and the object-side surface of the first lens element 110 is concave at a paraxial region and at a peripheral region; the image-side surface of the first lens element 110 is a free-form surface, and the image-side surface of the first lens element 110 is concave at a paraxial region and at a peripheral region.
In the embodiment of the present application, light with a wavelength of 905nm is taken as a reference, relevant parameters of the optical lens assembly 100 are shown in table 1, EFL is a focal length of the optical lens assembly 100, and TTL is a distance on an optical axis from an object-side surface of the first lens element 110 to an image-side surface of the first lens element 110; the units of focal length, radius of curvature and thickness are in millimeters.
TABLE 1
Figure BDA0002944511540000081
The free-form surface of the optical lens group satisfies the following equation:
Figure BDA0002944511540000091
where k is the conic coefficient, AiIs the free form surface coefficient, c is the curvature at the center of the optical surface, r is the perpendicular distance between a point on the free form surface and the optical axis, x is the x-direction component of r, y is the y-direction component of r, and z is the aspheric depth (the perpendicular distance between a point on the aspheric surface at r from the optical axis and a tangent plane tangent to the apex on the aspheric optical axis). For convenience, each free-form surface uses an extended polynomial surface type (extensedpolynomial) shown in the above formula. However, the present invention is not limited to the free form polynomial form of this formula. In the embodiment of the present application, the free-form surface data of the optical lens group is shown in table 2:
TABLE 2
Surface numbering k x1y0 x0y1 x2y0 x1y1 x0y2
S1 -5.075 0 0 -0.017 0 -1.396E-03
S2 -27.277 0 0 0.035 0 -1.715E-03
Fig. 2 shows a light distribution diagram when the optical lens assembly of the embodiment of the present application is used, and as can be seen from fig. 2, the optical lens assembly of the embodiment of the present application can make light distribution more uniform, and improve light utilization efficiency. Fig. 3 and 4 respectively show energy distribution patterns on a detection surface when the optical lens assembly of the prior art and the optical lens assembly of the embodiment of the present application are used, and it can be seen from fig. 3 and 4 that the energy distribution of light projected onto the detection surface can be more uniform after passing through the optical lens assembly of the embodiment of the present application.
Detailed description of the invention
Referring to fig. 5, the optical lens group 100 includes a first lens element 110 and a second lens element 120 sequentially disposed along an optical axis from an object plane to an image plane. The first lens element 110 with negative refractive power has a free-form object-side surface of the first lens element 110, and the object-side surface of the first lens element 110 is concave at a paraxial region and at a peripheral region; the image-side surface of the first lens element 110 is a free-form surface, and the image-side surface of the first lens element 110 is concave at a paraxial region and at a peripheral region. The second lens element 120 with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a periphery of the second lens element 120, and the image-side surface of the second lens element 120 is flat at the paraxial region and the peripheral region.
In the embodiment of the present application, light with a wavelength of 555nm is taken as a reference, relevant parameters of the optical lens assembly 100 are shown in table 3, EFL is a focal length of the optical lens assembly 100, and TTL is a distance on an optical axis from an object-side surface of the first lens element 110 to an image-side surface of the first lens element 110; the units of focal length, radius of curvature and thickness are in millimeters.
TABLE 3
Figure BDA0002944511540000101
In the embodiment of the present application, the free-form surface data of the optical lens group is shown in table 4:
TABLE 4
Surface numbering k x1y0 x0y1 x2y0 x1y1 x0y2
S1 -5.075 0 0 -0.031 0 -1.318E-03
S2 -27.277 0 0 0.042 0 -2.604E-03
Fig. 6 shows a light distribution diagram when the optical lens assembly of the embodiment of the present application is used, and as can be seen from fig. 6, the optical lens assembly of the embodiment of the present application can make light distribution more uniform, and improve light utilization efficiency. Fig. 3 and 7 respectively show energy distribution patterns on the detection surface when the optical lens assembly of the prior art and the optical lens assembly of the embodiment of the present application are used, and it can be seen from fig. 3 and 7 that the energy distribution of light projected onto the detection surface can be more uniform after passing through the optical lens assembly of the embodiment of the present application.
Detailed description of the preferred embodiment
Referring to fig. 8, the optical lens group 100 includes a first lens element 110 and a second lens element 120 sequentially disposed along an optical axis from an object plane to an image plane. The first lens element 110 with negative refractive power has a free-form object-side surface of the first lens element 110, and the object-side surface of the first lens element 110 is concave at a paraxial region and at a peripheral region; the image-side surface of the first lens element 110 is a free-form surface, and the image-side surface of the first lens element 110 is concave at a paraxial region and at a peripheral region. The second lens element 120 with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a periphery of the second lens element 120.
In the embodiment of the present application, light with a wavelength of 905nm is taken as a reference, relevant parameters of the optical lens assembly 100 are shown in table 5, EFL is a focal length of the optical lens assembly 100, and TTL is a distance on an optical axis from an object-side surface of the first lens element 110 to an image-side surface of the first lens element 110; the units of focal length, radius of curvature and thickness are in millimeters.
TABLE 5
Figure BDA0002944511540000102
Figure BDA0002944511540000111
In the embodiment of the present application, the free-form surface data of the optical lens group is shown in table 6:
TABLE 6
Surface numbering k x1y0 x0y1 x2y0 x1y1 x0y2
S1 -25.537 0 0 -0.016 0 -1.783E-03
S2 -140.518 0 0 0.027 0 3.775E-03
Fig. 9 shows a light distribution diagram when the optical lens assembly of the embodiment of the present application is used, and as can be seen from fig. 9, the optical lens assembly of the embodiment of the present application can make light distribution more uniform, and improve light utilization efficiency. Fig. 3 and 10 respectively show energy distribution patterns on a detection surface when the optical lens assembly of the prior art and the optical lens assembly of the embodiment of the present application are used, and it can be seen from fig. 3 and 10 that the energy distribution of light projected onto the detection surface can be more uniform after passing through the optical lens assembly of the embodiment of the present application.
Detailed description of the invention
Referring to fig. 11, the optical lens group 100 includes a first lens element 110 and a second lens element 120 sequentially disposed along an optical axis from an object plane to an image plane. The first lens element 110 with negative refractive power has a free-form object-side surface of the first lens element 110, and the object-side surface of the first lens element 110 is concave at a paraxial region and at a peripheral region; the image-side surface of the first lens element 110 is a free-form surface, and the image-side surface of the first lens element 110 is concave at a paraxial region and at a peripheral region. The second lens element 120 with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a periphery of the second lens element 120, and the image-side surface of the second lens element 120 is flat at the paraxial region and the peripheral region.
In the embodiment of the present application, light with a wavelength of 905nm is taken as a reference, relevant parameters of the optical lens assembly 100 are shown in table 7, EFL is a focal length of the optical lens assembly 100, and TTL is a distance on an optical axis from an object-side surface of the first lens element 110 to an image-side surface of the first lens element 110; the units of focal length, radius of curvature and thickness are in millimeters.
TABLE 7
Figure BDA0002944511540000112
Figure BDA0002944511540000121
In the embodiment of the present application, the free-form surface data of the optical lens group is shown in table 8:
TABLE 8
Surface numbering k x1y0 x0y1 x2y0 x1y1 x0y2
S1 -14.622 0 0 -0.016 0 -1.783E-03
S2 -134.716 0 0 0.027 0 3.775E-03
The aspheric surface of the optical lens group satisfies the following equation:
Figure BDA0002944511540000122
where k is the conic coefficient, A4、A6、A8、A10、A12Aspheric coefficients representing orders 4, 6, 8, 10, 12, c is the curvature at the center of the optical surface, r is the perpendicular distance from the point on the aspheric curve to the optical axis, and z is the aspheric depth (the perpendicular distance between the point on the aspheric curve at r from the optical axis and the tangent plane tangent to the apex on the aspheric optical axis). For convenience, each aspherical surface uses the aspherical surface shown in the above formula. However, the present invention is not limited to the form of the aspheric polynomial expressed by this formula. In the embodiment of the present application, the aspheric data of the optical lens group are shown in table 9:
TABLE 9
Surface numbering k A2 A4 A6 A8 A10
S3 -1.224E+01 -1.148E-03 -2.823E-06 -6.377E-10 2.175E-11 1.558E-13
Fig. 12 shows a light distribution diagram of the optical lens assembly in the embodiment of the present application when in use, and as can be seen from fig. 12, the optical lens assembly in the embodiment of the present application can make light distribution more uniform, and improve light utilization efficiency. Fig. 3 and 13 respectively show energy distribution patterns on the detection surface when the optical lens assembly of the prior art and the optical lens assembly of the embodiment of the present application are used, and it can be seen from fig. 3 and 13 that the energy distribution of the light projected onto the detection surface can be more uniform after passing through the optical lens assembly of the embodiment of the present application.
Detailed description of the preferred embodiment
Referring to fig. 14, the optical lens group 100 includes a first lens element 110 and a second lens element 120 sequentially disposed along an optical axis from an object plane to an image plane. The first lens element 110 with negative refractive power has a free-form object-side surface of the first lens element 110, and the object-side surface of the first lens element 110 is concave at a paraxial region and at a peripheral region; the image-side surface of the first lens element 110 is a free-form surface, and the image-side surface of the first lens element 110 is concave at a paraxial region and at a peripheral region. The second lens element 120 with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a periphery of the second lens element 120.
In the embodiment of the present application, light with a wavelength of 905nm is taken as a reference, relevant parameters of the optical lens assembly 100 are shown in table 10, EFL is a focal length of the optical lens assembly 100, and TTL is a distance on an optical axis from an object-side surface of the first lens element 110 to an image-side surface of the first lens element 110; the units of focal length, radius of curvature and thickness are in millimeters.
Watch 10
Figure BDA0002944511540000131
In the embodiment of the present application, the free-form surface data of the optical lens group is shown in table 11:
TABLE 11
Surface numbering k x1y0 x0y1 x2y0 x1y1 x0y2
S1 -14.622 0 0 -0.016 0 -1.783E-03
S2 -134.716 0 0 0.027 0 3.775E-03
In the embodiment of the present application, the aspheric data of the optical lens group are shown in table 12:
TABLE 12
Surface numbering k A2 A4 A6 A8 A10
S3 -1.250E+02 -1.142E-04 2.900E-07 2.478E-10 -4.637E-12 -1.679E-14
S4 -9.713E+01 1.317E-04 3.929E-07 -1.460E-09 1.789E-11 -9.307E-16
Fig. 15 shows a light distribution diagram of the optical lens assembly in the embodiment of the present application when in use, and as can be seen from fig. 15, the optical lens assembly in the embodiment of the present application can make light distribution more uniform, and improve light utilization efficiency. Fig. 3 and 16 respectively show energy distribution patterns on the detection surface when the optical lens assembly of the prior art and the optical lens assembly of the embodiment of the present application are used, and it can be seen from fig. 3 and 16 that the energy distribution of light projected onto the detection surface can be more uniform after passing through the optical lens assembly of the embodiment of the present application.
The data for the five sets of examples above are as in table 13 below:
Figure BDA0002944511540000132
Figure BDA0002944511540000141
in the description of the present application, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art. Further, in the description of the present application, "a plurality" means two or more unless otherwise specified. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present application and is not to be construed as limiting the scope of the present application, so that the present application is not limited thereto, and all equivalent variations and modifications can be made to the present application.

Claims (11)

1. An optical lens assembly comprising at most two lenses, said optical lens assembly comprising:
the first lens element with negative refractive power has a free-form surface on an object-side surface thereof, and the object-side surface thereof is concave at a paraxial region thereof; the image side surface of the first lens element is a free-form surface, and the image side surface of the first lens element is concave at a paraxial region.
2. The optical lens group of claim 1, further comprising:
the second lens element is disposed on an image side of the first lens element along the optical axis, and has a negative refractive power, and an object-side surface of the second lens element at a paraxial region thereof is concave.
3. Optical lens group according to claim 2, characterized in that it satisfies the following conditional expression:
-2.56≤EFL/TTL≤-0.16
wherein, EFL is a focal length of the optical lens group, and TTL is a distance on the optical axis from an object-side surface of the first lens element to an image-side surface of the second lens element.
4. Optical lens group according to claim 2, characterized in that it satisfies the following conditional expression:
0.13≤CT1/TTL≤1
wherein, CT1TTL is a distance on the optical axis from an object-side surface of the first lens element to an image-side surface of the second lens element, where TTL is a thickness of the first lens element on the optical axis.
5. Optical lens group according to claim 2, characterized in that it satisfies the following conditional expression:
0≤CT2/CT1≤3.23
wherein, CT1Is the thickness of the first lens on the optical axis, CT2Is the thickness of the second lens on the optical axis.
6. Optical lens group according to claim 2, characterized in that it satisfies the following conditional expression:
0≤G12/TTL≤0.47
wherein G is12The TTL is an air interval between the first lens element and the second lens element on the optical axis, and is a distance from an object-side surface of the first lens element to an image-side surface of the second lens element on the optical axis.
7. Optical lens group according to claim 2, characterized in that it satisfies the following conditional expression:
-2.74≤CT2/EFL≤0
wherein, CT2The EFL is a focal length of the optical lens assembly, and is a thickness of the second lens element on the optical axis.
8. Optical lens group according to claim 1, characterized in that it satisfies the following conditional expression:
-0.80≤RS1/CT1≤-0.42
wherein R isS1Is the radius of curvature of the object side surface of the first lens, CT1Is the thickness of the first lens on the optical axis.
9. Optical lens group according to claim 1, characterized in that it satisfies the following conditional expression:
0.24≤CT1/ALT≤1
wherein, CT1The ALT is the sum of the thicknesses of all the lenses in the optical lens group on the optical axis.
10. An optical module comprising an optical lens assembly according to any one of claims 1 to 9.
11. An apparatus comprising the optical module of claim 10.
CN202110188969.6A 2021-02-19 2021-02-19 Optical lens assembly, optical module and equipment Pending CN112904582A (en)

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