CN107436485B - Optical imaging system - Google Patents

Optical imaging system Download PDF

Info

Publication number
CN107436485B
CN107436485B CN201710859728.3A CN201710859728A CN107436485B CN 107436485 B CN107436485 B CN 107436485B CN 201710859728 A CN201710859728 A CN 201710859728A CN 107436485 B CN107436485 B CN 107436485B
Authority
CN
China
Prior art keywords
lens
imaging system
optical imaging
optical
ttl
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201710859728.3A
Other languages
Chinese (zh)
Other versions
CN107436485A (en
Inventor
戴付建
闻人建科
杨健
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Sunny Optics Co Ltd
Original Assignee
Zhejiang Sunny Optics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhejiang Sunny Optics Co Ltd filed Critical Zhejiang Sunny Optics Co Ltd
Priority to CN201710859728.3A priority Critical patent/CN107436485B/en
Publication of CN107436485A publication Critical patent/CN107436485A/en
Priority to PCT/CN2018/091834 priority patent/WO2019056817A1/en
Priority to US16/273,940 priority patent/US10996449B2/en
Application granted granted Critical
Publication of CN107436485B publication Critical patent/CN107436485B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • G02B13/004—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 four lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/08—Catadioptric systems

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The application discloses an optical imaging system, can include first lens, second lens and at least one follow-up lens along the optical axis in order from object side to image side, wherein, first lens can have: a first transmission surface arranged on the outer circumference of the object side surface of the first lens; the first reflecting surface is arranged on the outer circumference of the image side surface of the first lens; a second reflecting surface disposed at a paraxial portion of an object-side surface of the first lens; and a second transmission surface arranged at the paraxial position of the image side surface of the first lens, wherein the distance TTL from the center of the object side surface of the first lens of the optical imaging system to the imaging surface of the optical imaging system on the optical axis and the effective focal length f of the optical imaging system can satisfy the following conditions: TTL/f is less than or equal to 0.6.

Description

Optical imaging system
Technical Field
The present application relates to an optical imaging system, and more particularly, to an optical imaging system that refracts and reflects an optical path.
Background
Currently, common photosensitive elements of an optical system include a charge-coupled device (CCD) and a complementary metal-oxide semiconductor (CMOS) image sensor, and as the performance and size of the image sensor are improved, the requirements for an image pickup lens are also continuously increased.
In order to match the photosensitive element, the overall length of the optical lens needs to be further reduced, satisfying the requirements of miniaturization and light weight. However, the conventional imaging system equipped with a refractive optical system, a reflective optical system, and an imaging optical system cannot meet the requirement of miniaturization, and is difficult to match with an imaging device which is being miniaturized.
Therefore, the present invention is directed to provide an optical imaging system which is small in size, can effectively improve aberrations, and has high performance.
Disclosure of Invention
The technical solution provided by the present application at least partially solves the technical problems described above.
According to an aspect of the present application, there is provided an optical imaging system including, in order from an object side to an image side along an optical axis, a first lens, a second lens, and at least one subsequent lens, wherein the first lens may have: a first transmission surface arranged on the outer circumference of the object side surface of the first lens; a first reflecting surface arranged on the outer circumference of the image side surface of the first lens; a second reflecting surface disposed at a paraxial portion of an object-side surface of the first lens; and a second transmission surface arranged at the paraxial position of the image side surface of the first lens, wherein the distance TTL from the center of the object side surface of the first lens of the optical imaging system to the imaging surface of the optical imaging system on the optical axis and the effective focal length f of the optical imaging system can satisfy the following conditions: TTL/f is less than or equal to 0.6.
According to another aspect of the present application, there is also provided an optical imaging system including, in order from an object side to an image side along an optical axis, a first lens, a second lens, and at least one subsequent lens, wherein the first lens may have: a first transmission surface arranged on the outer circumference of the object side surface of the first lens; the first reflecting surface is arranged on the outer circumference of the image side surface of the first lens; a second reflecting surface disposed at a paraxial portion of an object-side surface of the first lens; and a second transmission surface disposed at a paraxial region of the image-side surface of the first lens, wherein a maximum effective radius DT1 of the first lens and a half ImgH of a diagonal length of an effective pixel region on an imaging surface of the optical imaging system satisfy: DT1/ImgH < 2.0.
According to another aspect of the present application, there is also provided an optical imaging system including, in order from an object side to an image side along an optical axis, a first lens, a second lens, and at least one subsequent lens, wherein the first lens may have: a first transmission surface arranged on the outer circumference of the object side surface of the first lens; the first reflecting surface is arranged on the outer circumference of the image side surface of the first lens; a second reflecting surface disposed at a paraxial portion of an object-side surface of the first lens; and a second transmission surface disposed at a paraxial region of the image-side surface of the first lens, wherein a maximum effective radius DT1 of the first lens satisfies: DT1<4.5 mm.
According to another aspect of the present application, there is also provided an optical imaging system including, in order from an object side to an image side along an optical axis, a first lens, a second lens, and at least one subsequent lens, wherein the first lens may have: a first transmission surface arranged on the outer circumference of the object side surface of the first lens; the first reflecting surface is arranged on the outer circumference of the image side surface of the first lens; a second reflecting surface disposed at a paraxial portion of an object-side surface of the first lens; and a second transmission surface disposed at a paraxial portion of the image-side surface of the first lens, wherein: 0.1< BFL/TTL <0.2, wherein BFL is the distance from the image side surface of the lens closest to the image side of the optical imaging system to the imaging surface of the optical imaging system on the optical axis; TTL is the distance on the optical axis from the center of the object-side surface of the first lens of the optical imaging system to the imaging plane of the optical imaging system.
According to another aspect of the present application, there is also provided an optical imaging system including, in order from an object side to an image side along an optical axis, a first lens, a second lens, and at least one subsequent lens, wherein the first lens may have: a first transmission surface arranged on the outer circumference of the object side surface of the first lens; the first reflecting surface is arranged on the outer circumference of the image side surface of the first lens; a second reflecting surface disposed at a paraxial portion of an object-side surface of the first lens; and a second transmission surface arranged at the paraxial position of the image side surface of the first lens, wherein the first reflection surface and the second reflection surface can have a total reflection effect.
In one embodiment, the maximum effective radius DT1 of the first lens may satisfy: DT1<4.5mm, e.g., DT1 ≦ 3.5.
In one embodiment, the maximum effective radius DT1 of the first lens and half of the diagonal length ImgH of the effective pixel area on the imaging plane of the optical imaging system may satisfy: DT1/ImgH <2.0, e.g., DT1/ImgH ≦ 1.3.
In one embodiment, the maximum effective radius DT1 of the first lens and the maximum effective radius DT2 of the second transmission surface of the first lens may satisfy: 0< DT2/DT1 ≦ 0.5, e.g., 0.3 ≦ DT2/DT1 ≦ 0.48.
In one embodiment, a distance TTL between an object side surface center of the first lens of the optical imaging system and an imaging plane of the optical imaging system on the optical axis and an effective focal length f of the optical imaging system may satisfy: TTL/f is less than or equal to 0.6.
In one embodiment, the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system may satisfy: f/EPD <2.8, e.g., f/EPD ≦ 2.6.
In one embodiment, the following may be satisfied: 0.1< BFL/TTL <0.2, e.g., 0.12 ≦ BFL/TTL ≦ 0.18. The BFL is the distance from the image side surface of the lens closest to the image side of the optical imaging system to the imaging surface of the optical imaging system on the optical axis; TTL is the distance on the optical axis from the center of the object-side surface of the first lens of the optical imaging system to the imaging plane of the optical imaging system.
In one embodiment, the first reflective surface and the second reflective surface may have a total reflection effect.
With the optical imaging system configured as described above, it is also possible to further have at least one of advantageous effects of miniaturization, high performance, high imaging quality, high resolution, balanced aberration, and the like.
Drawings
The above and other advantages of embodiments of the present application will become apparent from the detailed description made with reference to the following drawings, which are intended to illustrate and not to limit exemplary embodiments of the present application. In the drawings:
fig. 1 is a schematic configuration diagram showing an optical imaging system according to embodiment 1 of the present application;
fig. 2A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 1;
fig. 2B shows an astigmatism curve of the optical imaging system of embodiment 1;
fig. 2C shows a distortion curve of the optical imaging system of embodiment 1;
fig. 3 is a schematic configuration diagram showing an optical imaging system according to embodiment 2 of the present application;
fig. 4A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 2;
fig. 4B shows an astigmatism curve of the optical imaging system of embodiment 2;
fig. 4C shows a distortion curve of the optical imaging system of embodiment 2;
fig. 5 is a schematic configuration diagram showing an optical imaging system according to embodiment 3 of the present application;
fig. 6A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 3;
fig. 6B shows an astigmatism curve of the optical imaging system of embodiment 3; and
fig. 6C shows a distortion curve of the optical imaging system of embodiment 3.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in the present specification, expressions such as first, second, etc. are used only for distinguishing one feature from another feature, and do not indicate any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens without departing from the teachings of the present application.
In the drawings, the thickness, size and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "has," "including," and/or "including," 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. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in 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.
As used herein, the terms "substantially," "about," and the like are used as terms of table approximation and not as terms of table degree, and are intended to account for inherent deviations in measured or calculated values that will be recognized by those of ordinary skill in the art.
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.
The paraxial region refers to a region near the optical axis. The first lens is the lens closest to the object. Herein, a surface closest to the object in each lens is referred to as an object side surface, and a surface closest to the imaging surface in each lens is referred to as an image side surface.
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 present application is further described below with reference to specific examples.
An optical imaging system according to an exemplary embodiment of the present application may have at least three lenses. For example, in an exemplary embodiment, the optical imaging system may include a first lens, a second lens, a third lens, and a fourth lens. In another exemplary embodiment, the optical imaging system may include a first lens, a second lens, and a third lens. The at least three lenses are arranged in order from an object side to an image side along an optical axis.
In an exemplary embodiment, a first lens in the optical imaging system may have a first transmission plane disposed at an outer circumference of an object side surface of the first lens; the first reflecting surface is arranged on the outer circumference of the image side surface of the first lens; a second reflecting surface disposed at a paraxial portion of an object-side surface of the first lens; and a second transmission surface arranged at the paraxial position of the image side surface of the first lens. The refraction and reflection optical path is configured for the optical system, so that the total length of the optical system can be effectively reduced, and the spherical aberration of the system is introduced to the minimum extent, thereby improving the performance of the system.
In an exemplary embodiment, the maximum effective radius DT1 of the first lens may satisfy: DT1<4.5mm, more specifically, DT1 ≦ 3.5 may be further satisfied. By such a configuration, the aperture of the optical system can be reduced, and the miniaturization requirement can be satisfied.
In one embodiment, the maximum effective radius DT1 of the first lens and the half ImgH of the diagonal length of the effective pixel area on the imaging plane of the optical imaging system satisfy: DT1/ImgH <2.0, more specifically DT1/ImgH ≦ 1.3 may be further satisfied. By the configuration, the system resolution is improved as much as possible on the basis of meeting the requirement of aperture miniaturization.
In one embodiment, the maximum effective radius DT1 of the first lens and the maximum effective radius DT2 of the second transmission surface of the first lens may satisfy: 0< DT2/DT1 ≦ 0.5, and more specifically, 0.3 ≦ DT2/DT1 ≦ 0.48 may be further satisfied. By the configuration, the diffraction limit of the optical system can be effectively improved, and the system performance is improved.
In one embodiment, a distance TTL between an object side center of the first lens of the optical imaging system and an imaging plane of the optical imaging system on the optical axis and an effective focal length f of the optical imaging system may satisfy: TTL/f is 0.6 or less, and more specifically, TTL/f is 0.5 or less. With such a configuration, miniaturization of the optical system can be achieved.
In one embodiment, the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system may satisfy: f/EPD <2.8, more specifically, f/EPD ≦ 2.6 may be further satisfied. By such a configuration, the light flux amount of the optical system can be ensured, and the diffraction limit of the system can be further improved.
In one embodiment, the following may be satisfied: 0.1< BFL/TTL <0.2, more specifically, 0.12. ltoreq. BFL/TTL. ltoreq.0.18 can be further satisfied. The BFL is the distance from the image side surface of the lens closest to the image side of the optical imaging system to the imaging surface of the optical imaging system on the optical axis; TTL is the distance on the optical axis from the center of the object-side surface of the first lens of the optical imaging system to the imaging plane of the optical imaging system. Through the configuration, the value range of the back focal of the optical system can be ensured so as to meet the miniaturization requirement of the system and the requirement of the actual production and assembly of the system.
In one embodiment, the first reflective surface and the second reflective surface may have a total reflection effect. Through the refractive index range of reasonable selection lens, reducible aberration's production to effectively promote optical system's performance.
In an exemplary embodiment, the optical imaging system may further include a stop STO for limiting the light beam, and the amount of light entering is adjusted to improve the imaging quality. The optical imaging system according to the above-described embodiments of the present application may employ a plurality of lenses, such as three, four, etc., as described above. By introducing the refraction and reflection light path, the focal power, the surface type, the central thickness of each lens, the on-axis distance between each lens and the like are reasonably distributed, the miniaturization of the lens can be ensured, the aberration can be improved, and the imaging quality can be improved, so that the optical imaging system is more favorable for production and processing and is suitable for portable electronic products.
In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, has advantages of improving distortion aberration and astigmatism aberration, and can make a field of view larger and truer. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality. In addition, the use of the aspherical lens can also effectively reduce the number of lenses in the optical system.
However, it will be appreciated by those skilled in the art that the number of lenses constituting the lens barrel can be varied to achieve the various results and advantages described in the present specification without departing from the claimed technical solution. For example, the optical imaging system may also include other numbers of lenses.
Specific examples of the optical imaging system that can be applied to the above-described embodiments are further described below with reference to the drawings.
Example 1
An optical imaging system according to embodiment 1 of the present application is described below with reference to fig. 1 to 2C.
Fig. 1 shows a schematic configuration diagram of an optical imaging system according to embodiment 1 of the present application. As shown in fig. 1, the optical imaging system includes four lenses E1-E4 arranged in order from the object side to the imaging side along the optical axis.
The first lens E1 has a first transmission surface S1-1, a first reflection surface S2-1, a second reflection surface S1-2, and a second transmission surface S2-2. Wherein the first transmission surface S1-1 is disposed at the outer circumference of the object side of the first lens E1; the first reflecting surface S2-1 is arranged at the outer circumference of the image side surface of the first lens E1; the second reflecting surface S1-2 is arranged at the paraxial position of the object side surface of the first lens E1; and the second transmission surface S2-2 is disposed at a paraxial region of the image-side surface of the first lens E1.
The second lens E2 has an object side surface S3 and an image side surface S4.
The third lens E3 has an object-side surface S5 and an image-side surface S6.
The fourth lens E4 has an object-side surface S7 and an image-side surface S8.
In this embodiment, the first lens E1 has positive optical power; the second lens E2 has positive optical power; the third lens E3 has negative power; and the fourth lens E4 has a negative power.
In the optical imaging system of the present embodiment, a stop STO for limiting the light beam, which is disposed between the object side and the first lens, is further included.
The optical imaging system according to embodiment 1 may include a filter E5 having an object side S9 and an image side S10 and/or a protective lens E5'. The filter E5 can be used to correct color deviation, and the protection lens E5' can be used to protect the image sensor chip on the imaging surface S11. The light from the object sequentially passes through the respective surfaces S1-1 to S10 and is finally imaged on the imaging plane S11.
The surface type, radius of curvature, thickness, material and conic coefficient of each lens of the optical imaging system of example 1 are shown in table 1 below.
TABLE 1
Figure GDA0001441415010000081
In the embodiment, four lenses are taken as an example, and the total length of the lens is effectively shortened and the miniaturization of the lens is ensured by reasonably distributing the focal length and the surface type of each lens; meanwhile, various aberrations are corrected, and the resolution and the imaging quality of the lens are improved. Each aspherical surface type x is defined by the following formula:
Figure GDA0001441415010000091
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, and c is 1/R (i.e., paraxial curvature c is the reciprocal of radius of curvature R in table 1 above); k is the conic coefficient (given in table 1 above); ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below shows the high-order coefficient A of the mirror surfaces S1-1 to S8 in example 1 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 And A 18 。
TABLE 2
Flour mark A4 A6 A8 A10
S1-1 -2.3824E-01 1.4353E-02 6.8430E-04 6.4109E-05
S2-1 -5.2400E-03 5.7687E-03 1.5330E-04 4.2863E-05
S1-2 -3.0443E-02 2.6099E-03 -3.1578E-04 2.0871E-05
S2-2 -2.9897E-01 2.0469E-02 -2.8048E-03 6.1869E-04
S3 3.1293E-01 6.9919E-02 -2.3275E-02 -1.4469E-03
S4 -1.1068E-01 -1.5669E-01 1.4653E-01 -5.7398E-02
S5 -1.1207E-01 -9.3491E-02 6.7062E-02 -1.2024E-02
S6 -3.8914E-01 9.7372E-02 3.4014E-02 -5.2216E-02
S7 1.8100E-01 7.9782E-02 6.3035E-02 -5.1069E-02
S8 -1.1711E+00 8.1521E-02 -1.4241E-02 1.2572E-02
Flour mark A12 A14 A16 A18
S1-1 -6.6553E-05 5.06893E-06 0 0
S2-1 -1.9662E-05 0 0 0
S1-2 -1.0493E-05 2.38555E-06 0 0
S2-2 -3.6499E-05 0 0 0
S3 1.6512E-03 -0.000248928 -5.3314E-05 -1.4839E-05
S4 1.3707E-02 0 0 0
S5 0 0 0 0
S6 2.5616E-05 0 0 0
S7 8.8329E-05 0.004027896 0 0
S8 -1.7419E-03 0.003916624 0 0
Table 3 below shows the effective focal lengths f1 to f4 of the respective lenses, the effective focal length f of the optical imaging system, and the distance TTL on the optical axis from the second reflection surface S1-2 of the first lens E1 to the imaging surface S11 of the optical imaging system of example 1.
TABLE 3
f1(mm) 10.45 f(mm) 11.48
f2(mm) 11.11 TTL(mm) 5.05
f3(mm) -18.50
f4(mm) -2.85
As can be seen from tables 1 to 3, in this embodiment, the maximum effective radius DT1 of the first lens E1 satisfies DT1 ═ 2.77 mm; the maximum effective radius DT1 of the first lens E1 and the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging system meet the condition that DT1/ImgH is 1.01; the maximum effective radius DT1 of the first lens E1 and the maximum effective radius DT2 of the second transmission surface S2-2 of the first lens E1 meet the requirement that DT2/DT1 is 0.48; the distance TTL between the center of the second reflecting surface S1-2 of the first lens E1 of the optical imaging system and the imaging surface S11 of the optical imaging system on the optical axis and the effective focal length f of the optical imaging system satisfy TTL/f equal to 0.44; f/EPD is 2.3 between the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system; and BFL/TTL ═ 0.18 is satisfied, where BFL is a distance on the optical axis from the image-side surface S8 of the fourth lens element E4 to the imaging surface S11 of the optical imaging system; TTL is the distance on the optical axis from the center of the second reflecting surface S1-2 of the first lens of the optical imaging system to the imaging surface S11 of the optical imaging system.
Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 1, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical imaging system. Fig. 2B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 1. Fig. 2C shows a distortion curve of the optical imaging system of embodiment 1, which represents the distortion magnitude values in the case of different viewing angles. As can be seen from fig. 2A to 2C, the optical imaging system according to embodiment 1 can achieve good imaging quality.
Example 2
An optical imaging system according to embodiment 2 of the present application is described below with reference to fig. 3 to 4C. The optical imaging systems described in embodiment 2 and the following embodiments are the same in arrangement structure as the optical imaging system described in embodiment 1 except for parameters of the respective lenses of the optical imaging system, such as a radius of curvature, a thickness, a conic coefficient, an effective focal length, an on-axis pitch, a coefficient of a higher-order term of the respective mirror surfaces, and the like. For the sake of brevity, descriptions similar to those of embodiment 1 will be omitted.
Fig. 3 shows a schematic structural diagram of an optical imaging system according to embodiment 2 of the present application. As shown in fig. 3, the optical imaging system according to embodiment 2 includes four lenses E1 to E4 arranged in order from the object side to the imaging side along the optical axis.
The first lens E1 has a first transmission surface S1-1, a first reflection surface S2-1, a second reflection surface S1-2, and a second transmission surface S2-2. Wherein the first transmission surface S1-1 is disposed at the outer circumference of the object side surface of the first lens E1; the first reflecting surface S2-1 is arranged at the outer circumference of the image side surface of the first lens E1; the second reflecting surface S1-2 is arranged at the paraxial position of the object side surface of the first lens E1; and the second transmission surface S2-2 is disposed at a paraxial region of the image-side surface of the first lens E1.
The second lens E2 has an object-side surface S3 and an image-side surface S4.
The third lens E3 has an object-side surface S5 and an image-side surface S6.
The fourth lens E4 has an object-side surface S7 and an image-side surface S8.
In this embodiment, the first lens E1 has positive optical power; the second lens E2 has negative power; the third lens E3 has positive optical power; and the fourth lens E4 has positive optical power.
In the optical imaging system of the present embodiment, an aperture stop STO for limiting a light beam is further included, which is disposed between the object side and the first lens.
The optical imaging system according to embodiment 1 may include an optical filter and/or a protective lens. The optical filter can be used for correcting color deviation, and the protective lens can be used for protecting the image sensing chip on the imaging surface S9. The light from the object sequentially passes through the respective surfaces S1-1 to S8 and is finally imaged on the imaging plane S9.
Table 4 below shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system of example 2. Table 5 shows the high-order coefficient of each aspherical mirror surface in example 2. Table 6 shows the effective focal lengths f1 to f4 of the respective lenses, the effective focal length f of the optical imaging system, and the distance TTL on the optical axis from the second reflection surface S1-2 of the first lens E1 to the imaging surface S9 of the optical imaging system of example 2. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
TABLE 4
Figure GDA0001441415010000111
Figure GDA0001441415010000121
TABLE 5
Figure DA00014414150145401277
Figure DA00014414150145436576
TABLE 6
f1(mm) 7.86 f(mm) 11.02
f2(mm) -17.32 TTL(mm) 5.10
f3(mm) 3.65
f4(mm) 4.33
Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 2, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging system. Fig. 4B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 2. Fig. 4C shows a distortion curve of the optical imaging system of embodiment 2, which represents the distortion magnitude values in the case of different viewing angles. As can be seen from fig. 4A to 4C, the optical imaging system according to embodiment 2 can achieve good imaging quality.
Example 3
An optical imaging system according to embodiment 3 of the present application is described below with reference to fig. 5 to 6C.
Fig. 5 shows a schematic structural diagram of an optical imaging system according to embodiment 3 of the present application. As shown in fig. 5, the optical imaging system according to embodiment 3 includes three lenses E1 to E3 arranged in order from the object side to the imaging side along the optical axis.
The first lens E1 has a first transmission surface S1-1, a first reflection surface S2-1, a second reflection surface S1-2, and a second transmission surface S2-2. Wherein the first transmission surface S1-1 is disposed at the outer circumference of the object side of the first lens E1; the first reflecting surface S2-1 is arranged at the outer circumference of the image side surface of the first lens E1; the second reflecting surface S1-2 is arranged at the paraxial position of the object side surface of the first lens E1; and the second transmission surface S2-2 is disposed at a paraxial region of the image-side surface of the first lens E1.
The second lens E2 has an object-side surface S3 and an image-side surface S4.
The third lens E3 has an object-side surface S5 and an image-side surface S6.
In this embodiment, the first lens E1 has positive optical power; the second lens E2 has positive optical power; and the third lens E3 has a negative power.
In the optical imaging system of the present embodiment, an aperture stop STO for limiting a light beam is further included, which is disposed between the object side and the first lens.
The optical imaging system according to embodiment 1 may include an optical filter and/or a protective lens. The optical filter can be used for correcting color deviation, and the protective lens can be used for protecting the image sensing chip on the imaging surface S7. The light from the object sequentially passes through the respective surfaces S1-1 to S6 and is finally imaged on the imaging plane S7.
Table 7 below shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging system of example 3. Table 8 shows the high-order coefficient of each aspherical mirror surface in example 3. Table 9 shows the effective focal lengths f1 to f3 of the respective lenses, the effective focal length f of the optical imaging system, and the distance TTL on the optical axis from the second reflection surface S1-2 of the first lens E1 to the imaging surface S7 of the optical imaging system of embodiment 3. Wherein each aspherical surface type can be defined by formula (1) given in embodiment 1 above.
TABLE 7
Figure GDA0001441415010000141
TABLE 8
Flour mark A4 A6 A8 A10 A12
S1-1 -2.7582E-03 3.1256E-05 -1.1534E-05 1.3722E-06 -4.6616E-08
S2-1 -1.6954E-04 1.8984E-07 -5.6398E-07 1.1748E-07 -4.5044E-09
S1-2 6.4156E-03 1.8150E-03 -1.1857E-03 7.1212E-04 -1.0254E-04
S2-2 -1.6954E-04 1.8984E-07 -5.6398E-07 1.1748E-07 -4.5044E-09
S3 4.7363E-03 -2.1622E-01 1.8664E-01 -1.2229E-01 3.3098E-02
S4 1.4152E-01 -3.1109E-01 2.1960E-01 -7.4154E-02 9.4715E-03
S5 1.4577E-01 -1.7231E-01 1.9800E-01 -8.7079E-02 0.013828127
S6 -1.5028E-01 1.1142E-01 -4.7876E-02 1.0685E-02 -1.0120E-03
TABLE 9
f1(mm) 9.09 f(mm) 12.00
f2(mm) 14.62 TTL(mm) 4.67
f3(mm) -2.17
Fig. 6A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 3, which represents the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging system. Fig. 6B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging system of embodiment 3. Fig. 6C shows a distortion curve of the optical imaging system of embodiment 3, which represents the distortion magnitude values in the case of different viewing angles. As can be seen from fig. 6A to 6C, the optical imaging system according to embodiment 3 can achieve good imaging quality.
In summary, examples 1 to 3 each satisfy the relationship shown in table 10 below.
Watch 10
Conditions/examples 1 2 3
TTL/f 0.44 0.46 0.39
DT1(mm) 2.77 3.19 3.00
DT1/ImgH 1.01 1.20 1.29
f/EPD 2.30 2.60 2.19
BFL/TTL 0.18 0.12 0.16
DT2/DT1 0.48 0.33 0.44
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 as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents 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 (14)

1. An optical imaging system, comprising, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, and at least one subsequent lens element, wherein the first lens element has a positive refractive power, and has:
the first transmission surface is arranged on the outer circumference of the object side surface of the first lens;
the first reflecting surface is arranged on the outer circumference of the image side surface of the first lens;
the second reflecting surface is arranged at the paraxial position of the object side surface of the first lens; and
a second transmission surface arranged at a paraxial position of the image side surface of the first lens,
wherein, the distance TTL between the center of the object side surface of the first lens of the optical imaging system and the imaging surface of the optical imaging system on the optical axis and the effective focal length f of the optical imaging system satisfy: TTL/f is less than or equal to 0.6;
the number of lenses having optical power in the optical imaging system is at most four.
2. The optical imaging system of claim 1, wherein the maximum effective radius DT1 of the first lens satisfies: DT1<4.5 mm.
3. The optical imaging system according to claim 2, wherein the maximum effective radius DT1 of the first lens and the half ImgH of the diagonal length of the effective pixel area on the imaging plane of the optical imaging system satisfy: DT1/ImgH < 2.0.
4. The optical imaging system of any of claims 1-3, wherein a maximum effective radius DT1 of the first lens and a maximum effective radius DT2 of the second transmission surface of the first lens satisfy: 0< DT2/DT1 is less than or equal to 0.5.
5. The optical imaging system of claim 1, wherein an effective focal length f of the optical imaging system and an entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD < 2.8.
6. The optical imaging system of claim 1, wherein: 0.1< BFL/TTL <0.2,
the BFL is the distance from the image side surface of the lens closest to the image side of the optical imaging system to the imaging surface of the optical imaging system on the optical axis;
TTL is a distance on the optical axis from an object side center of the first lens element of the optical imaging system to an imaging plane of the optical imaging system.
7. The optical imaging system of claim 1, wherein the first and second reflective surfaces have a total reflection effect.
8. An optical imaging system, comprising, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, and at least one subsequent lens element, wherein the first lens element has a positive refractive power, and has:
the first transmission surface is arranged on the outer circumference of the object side surface of the first lens;
the first reflecting surface is arranged on the outer circumference of the image side surface of the first lens;
the second reflecting surface is arranged at the paraxial position of the object side surface of the first lens; and
a second transmission surface arranged at a paraxial position of the image side surface of the first lens,
wherein, the maximum effective radius DT1 of the first lens and the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging system satisfy that: DT1/ImgH < 2.0;
the number of lenses having optical power in the optical imaging system is at most four.
9. The optical imaging system of claim 8, wherein the maximum effective radius DT1 of the first lens satisfies: DT1<4.5 mm.
10. The optical imaging system of claim 8, wherein an effective focal length f of the optical imaging system and an entrance pupil diameter EPD of the optical imaging system satisfy: f/EPD < 2.8.
11. The optical imaging system of any of claims 8-10, wherein a maximum effective radius DT1 of the first lens and a maximum effective radius DT2 of the second transmission surface of the first lens satisfy: 0< DT2/DT1 is less than or equal to 0.5.
12. The optical imaging system of claim 8, wherein: 0.1< BFL/TTL <0.2,
the BFL is the distance between the image side surface of the lens closest to the image side of the optical imaging system and the imaging surface of the optical imaging system on the optical axis;
TTL is a distance on the optical axis from an object side center of the first lens element of the optical imaging system to an imaging plane of the optical imaging system.
13. The optical imaging system of claim 12, wherein a distance TTL between an object side center of the first lens of the optical imaging system and an imaging plane of the optical imaging system on the optical axis and an effective focal length f of the optical imaging system satisfy: TTL/f is less than or equal to 0.6.
14. The optical imaging system of claim 8, wherein the first and second reflective surfaces have a total reflection effect.
CN201710859728.3A 2017-09-21 2017-09-21 Optical imaging system Active CN107436485B (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201710859728.3A CN107436485B (en) 2017-09-21 2017-09-21 Optical imaging system
PCT/CN2018/091834 WO2019056817A1 (en) 2017-09-21 2018-06-19 Optical imaging system
US16/273,940 US10996449B2 (en) 2017-09-21 2019-02-12 Optical imaging system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710859728.3A CN107436485B (en) 2017-09-21 2017-09-21 Optical imaging system

Publications (2)

Publication Number Publication Date
CN107436485A CN107436485A (en) 2017-12-05
CN107436485B true CN107436485B (en) 2022-09-06

Family

ID=60462268

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710859728.3A Active CN107436485B (en) 2017-09-21 2017-09-21 Optical imaging system

Country Status (1)

Country Link
CN (1) CN107436485B (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019056817A1 (en) * 2017-09-21 2019-03-28 浙江舜宇光学有限公司 Optical imaging system
US11754822B2 (en) * 2018-08-01 2023-09-12 Samsung Electro-Mechanics Co., Ltd. Optical imaging system
CN113740999B (en) * 2020-05-29 2023-02-10 华为技术有限公司 Optical lens, lens module and electronic equipment
CN113960757B (en) * 2021-11-02 2023-07-04 江西晶超光学有限公司 Optical lens, camera module and electronic equipment
US20230134175A1 (en) * 2021-11-03 2023-05-04 SoliDDD Corp. Flat aperture telephoto lens
CN114114624B (en) * 2021-12-01 2023-10-27 浙江舜宇光学有限公司 Optical lens group
CN113933975B (en) * 2021-12-17 2022-05-17 江西晶超光学有限公司 Optical lens, camera module and electronic equipment
CN114488486B (en) * 2022-02-14 2023-10-27 浙江舜宇光学有限公司 Optical imaging system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006276816A (en) * 2004-12-07 2006-10-12 Olympus Corp Optical system
JP2009080410A (en) * 2007-09-27 2009-04-16 Olympus Corp Optical system and endoscope using the same
CN101542350A (en) * 2007-05-21 2009-09-23 索尼株式会社 Live view optical system and image picking-up device
CN106908936A (en) * 2015-12-22 2017-06-30 博立码杰通讯(深圳)有限公司 A kind of panoramic optical camera lens and image acquisition device
CN107209353A (en) * 2015-01-23 2017-09-26 三星电子株式会社 Mirror-lens system and image capture apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013015712A (en) * 2011-07-05 2013-01-24 Sony Corp Catadioptric lens system and imaging apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006276816A (en) * 2004-12-07 2006-10-12 Olympus Corp Optical system
CN101542350A (en) * 2007-05-21 2009-09-23 索尼株式会社 Live view optical system and image picking-up device
JP2009080410A (en) * 2007-09-27 2009-04-16 Olympus Corp Optical system and endoscope using the same
CN107209353A (en) * 2015-01-23 2017-09-26 三星电子株式会社 Mirror-lens system and image capture apparatus
CN106908936A (en) * 2015-12-22 2017-06-30 博立码杰通讯(深圳)有限公司 A kind of panoramic optical camera lens and image acquisition device

Also Published As

Publication number Publication date
CN107436485A (en) 2017-12-05

Similar Documents

Publication Publication Date Title
CN108873272B (en) Optical imaging lens
CN107436485B (en) Optical imaging system
CN107065141B (en) Imaging lens
CN107092077B (en) Optical imaging system
CN109581631B (en) Imaging lens
CN107024759B (en) Camera lens
CN114047607A (en) Optical imaging lens
CN108802972B (en) Optical imaging system
CN107167902B (en) Optical imaging lens
CN110333594A (en) Optical imaging lens
CN107783258B (en) Projection lens
WO2019056817A1 (en) Optical imaging system
CN110824676B (en) Optical imaging lens
CN112782835B (en) Optical imaging lens and fingerprint identification device
CN212009124U (en) Optical imaging lens
CN110609375B (en) Optical imaging lens
CN107065142B (en) Imaging lens group
CN110687665A (en) Image pickup lens assembly
CN111338054A (en) Optical imaging system
CN113156616A (en) Optical pick-up lens
CN106990505B (en) Imaging lens
CN111399191A (en) Optical imaging lens
CN111399184A (en) Optical imaging lens
CN111025565A (en) Optical lens
CN113093370B (en) Optical imaging lens

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant