CN109375348B - Optical imaging system - Google Patents

Optical imaging system Download PDF

Info

Publication number
CN109375348B
CN109375348B CN201811579987.1A CN201811579987A CN109375348B CN 109375348 B CN109375348 B CN 109375348B CN 201811579987 A CN201811579987 A CN 201811579987A CN 109375348 B CN109375348 B CN 109375348B
Authority
CN
China
Prior art keywords
lens
imaging system
optical imaging
optical
image
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
CN201811579987.1A
Other languages
Chinese (zh)
Other versions
CN109375348A (en
Inventor
贺凌波
张锐
戴付建
赵烈烽
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 CN201811579987.1A priority Critical patent/CN109375348B/en
Publication of CN109375348A publication Critical patent/CN109375348A/en
Application granted granted Critical
Publication of CN109375348B publication Critical patent/CN109375348B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • 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

Landscapes

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

Abstract

The application discloses an optical imaging system, which sequentially comprises the following components from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens having optical power. The first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the fourth lens has positive focal power; at least one of the first lens to the sixth lens has an aspherical surface that is non-rotationally symmetrical; and the effective focal length fx of the optical imaging system in the X-axis direction and the effective focal length fy of the optical imaging system in the Y-axis direction satisfy 0.5 < fx/fy < 1.5.

Description

Optical imaging system
Technical Field
The present application relates to an optical imaging system, and more particularly, to an optical imaging system including six lenses.
Background
In recent years, with the rapid development of three-dimensional depth recognition technology, TOF technology has also begun to be favored by users in the field of three-dimensional detection. TOF technology, also known as Time of Flight, refers to a technology that achieves target object localization by detecting the Flight (round trip) Time of a light pulse. Unlike traditional single-point laser ranging, TOF technology adopts an array detector, and can acquire three-dimensional space information of the whole object at the same time. Generally, lenses configured in TOF cameras need to have a large relative aperture, small chief ray angle of incidence (CRA).
The optical imaging system currently applied to the TOF camera mostly adopts a six-piece structure, however, the lens surface type thereof is mostly an aspherical surface with rotational symmetry (axial symmetry). Such rotationally symmetrical aspherical surfaces can be seen as a curve in the meridian plane which is formed by 360 ° rotation around the optical axis, and thus have sufficient degrees of freedom only in the meridian plane and do not correct off-axis aberrations well.
Disclosure of Invention
The present application provides an optical imaging system applicable to portable electronic products, such as an optical imaging system applicable to a TOF camera, which at least solves or partially solves at least one of the above-mentioned drawbacks of the prior art.
In one aspect, the present application provides an optical imaging system including, in order from an object side to an image side along an optical axis, a first lens having optical power, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens element with negative refractive power may have a convex object-side surface and a concave image-side surface; the fourth lens may have positive optical power; at least one of the first to sixth lenses may have an aspherical surface that is non-rotationally symmetrical. The effective focal length fx of the optical imaging system in the X-axis direction and the effective focal length fy of the optical imaging system in the Y-axis direction can meet 0.5 < fx/fy < 1.5.
In one embodiment, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens may satisfy 0.5 < f1/f2 < 2.0.
In one embodiment, the radius of curvature R2 of the image side of the first lens and the effective focal length fx of the optical imaging system in the X-axis direction may satisfy 1.5 < R2/fx < 3.5.
In one embodiment, the radius of curvature R4 of the image side of the second lens and the effective focal length fx of the optical imaging system in the X-axis direction may satisfy 0.5 < R4/fx < 3.5.
In one embodiment, the radius of curvature R9 of the object side surface of the fifth lens element and the effective focal length fx in the X-axis direction of the optical imaging system may satisfy 1.5 < R9/fx < 3.5.
In one embodiment, the center thickness CT5 of the fifth lens on the optical axis and the center thickness CT6 of the sixth lens on the optical axis may satisfy 2.5 < CT5/CT6 < 4.5.
In one embodiment, the center thickness CT4 of the fourth lens on the optical axis and the center thickness CT3 of the third lens on the optical axis may satisfy 1.5 < CT4/CT3 < 3.
In one embodiment, the distance T12 between the first lens and the second lens on the optical axis, the distance T34 between the third lens and the fourth lens on the optical axis, the distance T56 between the fifth lens and the sixth lens on the optical axis and the distance TTL between the object side surface of the first lens and the imaging surface of the optical imaging system on the optical axis can satisfy 0.ltoreq (T12+T34+T56)/TTL < 0.5.
In one embodiment, the maximum half field angle Semi-FOV of the optical imaging system may satisfy Semi-FOV > 80 °.
In one embodiment, the f-number Fno of the optical imaging system may satisfy Fno < 1.5.
In one embodiment, the operating band of the optical imaging system may be 900nm to 1000nm.
In another aspect, the present application provides an optical imaging system including, in order from an object side to an image side along an optical axis, a first lens having optical power, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens element with negative refractive power may have a convex object-side surface and a concave image-side surface; the second lens may have negative optical power; the fourth lens may have positive optical power; at least one of the first to sixth lenses may have an aspherical surface that is non-rotationally symmetrical. The effective focal length f1 of the first lens and the effective focal length f2 of the second lens can satisfy 0.5 < f1/f2 < 2.0.
In yet another aspect, the present application provides an optical imaging system including, in order from an object side to an image side along an optical axis, a first lens having optical power, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens element with negative refractive power may have a convex object-side surface and a concave image-side surface; the fourth lens may have positive optical power; at least one of the first to sixth lenses may have an aspherical surface that is non-rotationally symmetrical. The curvature radius R2 of the image side surface of the first lens and the effective focal length fx of the optical imaging system in the X-axis direction can meet the condition that R2/fx is smaller than 1.5 and smaller than 3.5.
In yet another aspect, the present application provides an optical imaging system including, in order from an object side to an image side along an optical axis, a first lens having optical power, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens element with negative refractive power may have a convex object-side surface and a concave image-side surface; the fourth lens may have positive optical power; at least one of the first to sixth lenses may have an aspherical surface that is non-rotationally symmetrical. The curvature radius R4 of the image side surface of the second lens and the effective focal length fx of the optical imaging system in the X-axis direction can meet 0.5 < R4/fx < 3.5.
In yet another aspect, the present application provides an optical imaging system including, in order from an object side to an image side along an optical axis, a first lens having optical power, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens element with negative refractive power may have a convex object-side surface and a concave image-side surface; the fourth lens may have positive optical power; at least one of the first to sixth lenses may have an aspherical surface that is non-rotationally symmetrical. The curvature radius R9 of the object side surface of the fifth lens and the effective focal length fx of the optical imaging system in the X-axis direction can meet the condition that R9/fx is smaller than 1.5 and smaller than 3.5.
In yet another aspect, the present application provides an optical imaging system including, in order from an object side to an image side along an optical axis, a first lens having optical power, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens element with negative refractive power may have a convex object-side surface and a concave image-side surface; the fourth lens may have positive optical power; at least one of the first to sixth lenses may have an aspherical surface that is non-rotationally symmetrical. The center thickness CT5 of the fifth lens on the optical axis and the center thickness CT6 of the sixth lens on the optical axis can meet the condition that CT5/CT6 is smaller than 2.5 and smaller than 4.5.
In yet another aspect, the present application provides an optical imaging system including, in order from an object side to an image side along an optical axis, a first lens having optical power, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens element with negative refractive power may have a convex object-side surface and a concave image-side surface; the fourth lens may have positive optical power; at least one of the first to sixth lenses may have an aspherical surface that is non-rotationally symmetrical. The center thickness CT4 of the fourth lens on the optical axis and the center thickness CT3 of the third lens on the optical axis can meet the condition that CT4/CT3 is smaller than 3 and larger than 1.5.
In yet another aspect, the present application provides an optical imaging system including, in order from an object side to an image side along an optical axis, a first lens having optical power, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens element with negative refractive power may have a convex object-side surface and a concave image-side surface; the fourth lens may have positive optical power; at least one of the first to sixth lenses may have an aspherical surface that is non-rotationally symmetrical. The distance T12 between the first lens and the second lens on the optical axis, the distance T34 between the third lens and the fourth lens on the optical axis, the distance T56 between the fifth lens and the sixth lens on the optical axis and the distance TTL between the object side surface of the first lens and the imaging surface of the optical imaging system on the optical axis can meet the condition that the TTL is less than or equal to 0.5 and less than or equal to (T12+T34+T56).
In yet another aspect, the present application provides an optical imaging system including, in order from an object side to an image side along an optical axis, a first lens having optical power, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens element with negative refractive power may have a convex object-side surface and a concave image-side surface; the fourth lens may have positive optical power; at least one of the first to sixth lenses may have an aspherical surface that is non-rotationally symmetrical. The maximum half field angle Semi-FOV of the optical imaging system can meet the requirement that the Semi-FOV is more than 80 degrees.
In yet another aspect, the present application provides an optical imaging system including, in order from an object side to an image side along an optical axis, a first lens having optical power, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens element with negative refractive power may have a convex object-side surface and a concave image-side surface; the fourth lens may have positive optical power; at least one of the first to sixth lenses may have an aspherical surface that is non-rotationally symmetrical. Wherein, the f-number FNO of the optical imaging system can meet FNO < 1.5.
In yet another aspect, the present application provides an optical imaging system including, in order from an object side to an image side along an optical axis, a first lens having optical power, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens element with negative refractive power may have a convex object-side surface and a concave image-side surface; the fourth lens may have positive optical power; at least one of the first to sixth lenses may have an aspherical surface that is non-rotationally symmetrical. Wherein the operating band of the optical imaging system may be 900nm to 1000nm.
The application adopts a plurality of (for example, six) lenses, and the optical imaging system has at least one beneficial effect of large field angle, large aperture, high pixel and the like by reasonably distributing the focal power, the surface type, the center thickness of each lens, the axial spacing between each lens and the like. In addition, by introducing the non-rotationally symmetrical aspheric surface, the off-axis meridian aberration and the sagittal aberration of the optical imaging system are corrected simultaneously, so that the improvement of the image quality is further obtained.
Drawings
Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:
Fig. 1 shows a schematic configuration diagram of an optical imaging system according to embodiment 1 of the present application;
FIG. 2 schematically illustrates the RMS spot diameter of the optical imaging system of example 1 within a first quadrant;
Fig. 3 shows a schematic configuration diagram of an optical imaging system according to embodiment 2 of the present application;
FIG. 4 schematically illustrates the RMS spot diameter of the optical imaging system of example 2 within the first quadrant;
fig. 5 shows a schematic configuration diagram of an optical imaging system according to embodiment 3 of the present application;
FIG. 6 schematically illustrates the RMS spot diameter of the optical imaging system of example 3 within the first quadrant;
fig. 7 shows a schematic configuration diagram of an optical imaging system according to embodiment 4 of the present application;
FIG. 8 schematically illustrates the RMS spot diameter of the optical imaging system of example 4 within the first quadrant;
fig. 9 shows a schematic configuration diagram of an optical imaging system according to embodiment 5 of the present application;
FIG. 10 schematically illustrates the RMS spot diameter of the optical imaging system of example 5 in the first quadrant;
fig. 11 shows a schematic configuration diagram of an optical imaging system according to embodiment 6 of the present application;
FIG. 12 schematically illustrates the RMS spot diameter of the optical imaging system of example 6 in the first quadrant;
fig. 13 shows a schematic configuration diagram of an optical imaging system according to embodiment 7 of the present application;
FIG. 14 schematically illustrates the RMS spot diameter of the optical imaging system of example 7 in the first quadrant;
fig. 15 shows a schematic configuration diagram of an optical imaging system according to embodiment 8 of the present application;
FIG. 16 schematically illustrates the RMS spot diameter of the optical imaging system of example 8 in the first quadrant;
fig. 17 shows a schematic configuration diagram of an optical imaging system according to embodiment 9 of the present application;
FIG. 18 schematically illustrates the RMS spot diameter of the optical imaging system of example 9 in the first quadrant;
Fig. 19 shows a schematic configuration diagram of an optical imaging system according to embodiment 10 of the present application;
fig. 20 schematically illustrates the RMS spot diameter of the optical imaging system of example 10 in the first quadrant.
Detailed Description
For a better understanding of the application, various aspects of the 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 application and is not intended to limit the scope of the 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, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. In each lens, the surface closest to the subject is referred to as the subject side of the lens; in each lens, the surface closest to the imaging plane is referred to as the image side of the lens.
Herein, we define a direction parallel to the optical axis as a Z-axis direction, a direction perpendicular to the Z-axis and lying in a meridian plane as a Y-axis direction, and a direction perpendicular to the Z-axis and lying in a sagittal plane as an X-axis direction. Herein, each parametric symbol (e.g., radius of curvature) herein represents a characteristic parameter value along the Y-axis direction of the optical imaging system unless otherwise specified. For example, unless otherwise specified, the conditional expression "R9/fx" indicates a ratio of the radius of curvature R9 of the object side surface of the fifth lens in the Y-axis direction to the effective focal length fx of the optical imaging system in the X-axis direction.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
The features, principles, and other aspects of the present application are described in detail below.
The optical imaging system according to the exemplary embodiment of the present application may include, for example, six lenses having optical power, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The six lenses are sequentially arranged from the object side to the image side along the optical axis, and each adjacent lens can have an air space therebetween.
In an exemplary embodiment, the first lens may have negative optical power, an object-side surface thereof may be convex, and an image-side surface thereof may be concave; the second lens has positive optical power or negative optical power; the third lens has positive optical power or negative optical power; the fourth lens may have positive optical power; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power. The focal power and the surface shape of the first lens are reasonably designed, so that the first lens can be guaranteed to have good processability, the optical imaging system has the advantage of a large field angle, the incidence angle of the chief ray incident on the imaging surface is reduced, and the relative illuminance of the imaging surface is improved; and the focal power of the fourth lens is reasonably designed, so that the off-axis aberration of the optical imaging system can be corrected, and the imaging quality can be improved.
In addition, the image quality may be further improved by setting the object side surface and/or the image side surface of at least one of the first lens to the sixth lens to an aspherical surface that is non-rotationally symmetrical. The non-rotationally symmetrical aspheric surface is a free-form surface, and the non-rotationally symmetrical component is added on the basis of the rotationally symmetrical aspheric surface, so that the introduction of the non-rotationally symmetrical aspheric surface in the lens system is beneficial to effectively correcting off-axis meridian aberration and sagittal aberration, and greatly improving the performance of the optical system. Optionally, the object side surface and/or the image side surface of the sixth lens may be non-rotationally symmetric aspheric surfaces.
In an exemplary embodiment, the second lens may have negative optical power, and an image side surface thereof may be concave.
In an exemplary embodiment, the image side surface of the third lens may be convex.
In an exemplary embodiment, the object side surface of the fifth lens may be convex.
In an exemplary embodiment, the optical imaging system may have an operating band of about 900nm to about 1000nm, so that the optical imaging system according to the present application can be well applied to the near infrared band.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.5 < fx/fy < 1.5, where fx is an effective focal length of the optical imaging system in an X-axis direction and fy is an effective focal length of the optical imaging system in a Y-axis direction. More specifically, fx and fy may further satisfy 0.81.ltoreq.fx/fy.ltoreq.1.25. The focal length ratio in the X-axis and Y-axis directions is reasonably configured, so that the degree of freedom of the free curved surface in two directions is improved, and the correcting effect of the optical imaging system on off-axis aberration is optimized; meanwhile, the aberration and various parameters of the optical imaging system are controlled in a proper range, and finally, a high-quality image is obtained.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.5 < f1/f2 < 2.0, where f1 is an effective focal length of the first lens and f2 is an effective focal length of the second lens. More specifically, f1 and f2 may further satisfy 0.66.ltoreq.f1/f2.ltoreq.1.84. The optical power of the first lens and the optical power of the second lens are reasonably configured, so that the sharing of a large object space field of view and the correction of off-axis aberration generated by the rear end lens are facilitated, and the imaging quality of the lens is improved.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1.5 < R2/fx < 3.5, where R2 is a radius of curvature of an image side surface of the first lens and fx is an effective focal length in an X-axis direction of the optical imaging system. More specifically, R2 and fx may further satisfy 1.6 < R2/fx < 3.3, for example 1.70.ltoreq.R2/fx.ltoreq.3.14. The ratio of the curvature radius of the image side surface of the first lens to the effective focal length in the X-axis direction is reasonably controlled, so that the curvature of the image side surface of the first lens can be effectively controlled, the field curvature contribution of the first lens is in a reasonable range, and the optical sensitivity of the image side surface of the first lens can be reduced.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0.5 < R4/fx < 3.5, where R4 is a radius of curvature of an image side surface of the second lens and fx is an effective focal length in an X-axis direction of the optical imaging system. More specifically, R4 and fx may further satisfy 0.80.ltoreq.R4/fx.ltoreq.3.20. The ratio of the curvature radius of the image side surface of the second lens to the effective focal length in the X-axis direction is reasonably controlled, so that the curvature of the image side surface of the second lens can be effectively controlled, the on-axis chromatic aberration can be effectively reduced, and good imaging quality is ensured.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1.5 < R9/fx < 3.5, where R9 is a radius of curvature of an object side surface of the fifth lens element and fx is an effective focal length in an X-axis direction of the optical imaging system. More specifically, R9 and fx may further satisfy 1.6 < R9/fx < 3.2, e.g., 1.75.ltoreq.R9/fx.ltoreq.3.08. The ratio of the curvature radius of the object side surface of the fifth lens to the effective focal length in the X-axis direction is reasonably controlled, so that the curvature of the object side surface of the fifth lens can be effectively controlled, the matching of the Chief Ray Angle (CRA) of the lens can be ensured, and the astigmatism and the field curvature of the lens can be effectively corrected.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 2.5 < CT5/CT6 < 4.5, where CT5 is a center thickness of the fifth lens on the optical axis and CT6 is a center thickness of the sixth lens on the optical axis. More specifically, CT5 and CT6 may further satisfy 2.5 < CT5/CT6 < 4.3, for example 2.60. Ltoreq.CT 5/CT 6. Ltoreq.4.12. The center thickness of the fifth lens and the sixth lens is reasonably distributed, so that the lenses are easy to injection mold, the processability of an imaging system is improved, and good imaging quality can be ensured.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 1.5 < CT4/CT3 < 3, where CT4 is a center thickness of the fourth lens on the optical axis and CT3 is a center thickness of the third lens on the optical axis. More specifically, CT4 and CT3 may further satisfy 1.58.ltoreq.CT4/CT 3.ltoreq.2.79. The thickness of the center of the fourth lens and the thickness of the center of the third lens on the optical axis are reasonably configured, so that the thickness sensitivity of the lens can be effectively reduced, and the correction of curvature of field is facilitated.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression 0+ (t12+t34+t56)/TTL < 0.5, where T12 is the distance between the first lens and the second lens on the optical axis, T34 is the distance between the third lens and the fourth lens on the optical axis, T56 is the distance between the fifth lens and the sixth lens on the optical axis, and TTL is the distance between the object side surface of the first lens and the imaging surface of the optical imaging system on the optical axis. More specifically, T12, T34, T56 and TTL can further satisfy 0.ltoreq.T12+T34+T56)/TTL < 0.4, for example 0.10.ltoreq.T12+T34+T56)/TTL.ltoreq.0.22. The spacing distance of each adjacent lens on the optical axis is reasonably configured, so that the thickness sensitivity of the lens can be effectively reduced, and the correction of curvature of field is facilitated.
In an exemplary embodiment, the optical imaging system of the present application may satisfy a conditional Semi-FOV > 80 °, where Semi-FOV is the maximum half field angle of the optical imaging system. More specifically, the Semi-FOV may further satisfy 80 DEG < Semi-FOV < 85 DEG, for example 81.0 DEG.ltoreq.semi-FOV.ltoreq.82.0 deg. Controlling the maximum half field angle of the optical imaging system to be greater than 80 is beneficial to expanding the obtained object information.
In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional expression Fno < 1.5, where Fno is an f-number of the optical imaging system. More specifically, fno may further satisfy 1.1 < Fno < 1.3, for example, 1.22.ltoreq.Fno.ltoreq.1.24. The condition FNo is smaller than 1.5, so that larger light incoming quantity can be obtained under the condition of the same focal length, the illuminance of an image plane and the response of a chip are improved, and the power consumption of the system is reduced.
In an exemplary embodiment, the optical imaging system may further include a diaphragm to improve the imaging quality of the lens. Optionally, a stop may be provided between the second lens and the third lens.
Optionally, the optical imaging system may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element located on the imaging surface.
The optical imaging system according to the above embodiment of the present application may employ a plurality of lenses, for example, six lenses as described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial spacing between each lens and the like, the volume of the lens can be effectively reduced, the sensitivity of the lens can be reduced, and the processability of the lens can be improved, so that the optical imaging system is more beneficial to production and processing and is applicable to portable electronic products. In addition, by introducing an aspherical surface which is not rotationally symmetrical, the off-axis meridian aberration and the sagittal aberration of the optical imaging system can be corrected, and further image quality improvement can be obtained.
In the embodiment of the present application, aspherical mirror surfaces are often used as the mirror surfaces of the respective lenses. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality. Alternatively, the object side surface and the image side surface of at least one of the second lens, the third lens, the fifth lens, and the sixth lens may be aspherical surfaces. The object side surface and the image side surface of at least one of the first lens and the fourth lens may be spherical surfaces.
However, those skilled in the art will appreciate that the number of lenses making up an optical imaging system can be varied to achieve the various results and advantages described in this specification without departing from the scope of the application as claimed. For example, although six lenses are described as an example in the embodiment, the optical imaging system is not limited to including six lenses. The optical imaging system may also include other numbers of lenses, if desired.
Specific examples of the optical imaging system applicable to the above-described embodiments are further described below with reference to the accompanying drawings.
Example 1
An optical imaging system according to embodiment 1 of the present application is described below with reference to fig. 1 and 2. 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, an optical imaging system according to an exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an optical filter E7, a cover glass E8, and an imaging surface S17.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The filter E7 has an object side surface S13 and an image side surface S14. The cover glass E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Alternatively, the operating band of the optical imaging system may be about 900nm to about 1000nm.
Table 1 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the optical imaging system of example 1, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
TABLE 1
It should be understood that the "radius of curvature X" and "conic coefficient X" not specifically indicated (blank) in the above table remain consistent with the corresponding values of "radius of curvature Y" and "conic coefficient Y". The following examples are similar.
As can be seen from table 1, the object side surface and the image side surface of any one of the second lens element E2, the third lens element E3 and the fifth lens element E5 and the object side surface S11 of the sixth lens element E6 are aspheric. In the present embodiment, the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:
Wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is the conic coefficient (given in table 1); ai is the correction coefficient of the aspherical i-th order. The higher order coefficients A 4、A6、A8、A10、A12、A14、A16、A18 and A 20 that can be used for each of the aspherical mirror surfaces S3-S6, S9-S11 in example 1 are given in Table 2 below.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S3 9.3082E-03 -1.4174E-03 1.5172E-04 -1.0588E-05 4.4981E-07 -1.0611E-08 1.0630E-10 2.6682E-34 2.6682E-34
S4 2.5510E-02 -3.0568E-03 2.0939E-04 3.1634E-05 -6.3501E-06 4.2395E-07 -1.0467E-08 2.6682E-34 2.6682E-34
S5 -8.2000E-03 -7.4225E-04 4.5523E-04 -3.2588E-04 1.0386E-04 -1.7392E-05 1.1172E-06 2.6682E-34 2.6682E-34
S6 -3.9060E-03 -3.1852E-04 2.2890E-04 -9.9174E-05 2.3584E-05 -3.1125E-06 1.6892E-07 2.6682E-34 2.6682E-34
S9 -9.7859E-04 -5.5656E-05 -2.0138E-05 4.1505E-06 -5.1648E-07 2.9308E-08 -5.7860E-10 2.6682E-34 2.6682E-34
S10 -1.2991E-03 -1.4219E-03 2.5469E-04 -2.1076E-05 8.7167E-07 -1.3626E-08 7.9692E-33 2.6682E-34 2.6682E-34
S11 -6.0291E-03 3.4062E-03 -8.1083E-04 1.0158E-04 -7.0796E-06 2.6135E-07 -3.9778E-09 2.6682E-34 2.6682E-34
TABLE 2
As can be further seen from table 1, the image side surface S12 of the sixth lens element E6 is an aspheric surface (i.e., AAS surface) which is not rotationally symmetrical, and the surface shape of the aspheric surface can be defined by, but not limited to, the following aspheric surface formula which is not rotationally symmetrical:
Wherein Z is the sagittal height of the plane parallel to the Z-axis direction; CUX and CUY are the curvatures (=1/radius of curvature) of the vertices of the X, Y-direction faces, respectively; KX and KY are X, Y direction cone coefficients respectively; AR, BR, CR, DR, ER, FR, GR, HR, JR are 4 th, 6 th, 8 th, 10 th, 12 th, 14 th, 16 th, 18 th, 20 th coefficients in the aspheric rotationally symmetric component, respectively; AP, BP, CP, DP, EP, FP, GP, HP, JP are the 4 th, 6 th, 8 th, 10 th, 12 th, 14 th, 16 th, 18 th, 20 th coefficients, respectively, in the aspheric non-rotationally symmetric component. Table 3 below gives the AR, BR, CR, DR, ER, FR, GR, HR, JR coefficients and AP, BP, CP, DP, EP, FP, GP, HP, JP coefficients of the non-rotationally symmetrical aspherical surface S12 that can be used in example 1.
TABLE 3 Table 3
Table 4 shows the effective focal lengths f1 to f6 of the respective lenses in embodiment 1, the effective focal length fx in the X-axis direction of the optical imaging system, the effective focal length fy in the Y-axis direction of the optical imaging system, the total optical length TTL of the optical imaging system (i.e., the distance on the optical axis from the object side surface S1 to the imaging surface S17 of the first lens E1), half of the diagonal length ImgH of the effective pixel area on the imaging surface S17, the maximum half field angle Semi-FOV, and the f-number Fno.
f1(mm) -9.56 fx(mm) 2.60
f2(mm) -12.52 fy(mm) 2.08
f3(mm) 12.88 TTL(mm) 22.03
f4(mm) 8.63 ImgH(mm) 3.09
f5(mm) 2.84 Semi-FOV(°) 81.0
f6(mm) -7.55 Fno 1.23
TABLE 4 Table 4
The optical imaging system in embodiment 1 satisfies:
fx/fy=1.25, where fx is an effective focal length in the X-axis direction of the optical imaging system and fy is an effective focal length in the Y-axis direction of the optical imaging system;
f1/f2=0.76, where f1 is the effective focal length of the first lens E1 and f2 is the effective focal length of the second lens E2;
r2/fx=1.77, where R2 is a radius of curvature of the image side surface S2 of the first lens E1, and fx is an effective focal length in the X-axis direction of the optical imaging system;
r4/fx=0.80, where R4 is a radius of curvature of the image side surface S4 of the second lens E2, and fx is an effective focal length in the X-axis direction of the optical imaging system;
R9/fx=1.79, where R9 is a radius of curvature of the object side surface S9 of the fifth lens E5, and fx is an effective focal length in the X-axis direction of the optical imaging system;
CT 5/ct6=4.00, wherein CT5 is the center thickness of the fifth lens E5 on the optical axis, and CT6 is the center thickness of the sixth lens E6 on the optical axis;
CT 4/ct3=2.08, wherein CT4 is the center thickness of the fourth lens E4 on the optical axis, and CT3 is the center thickness of the third lens E3 on the optical axis;
(t12+t34+t56)/ttl=0.11, where T12 is an optical axis separation distance of the first lens element E1 and the second lens element E2, T34 is an optical axis separation distance of the third lens element E3 and the fourth lens element E4, T56 is an optical axis separation distance of the fifth lens element E5 and the sixth lens element E6, and TTL is an optical axis separation distance from the object side surface S1 of the first lens element E1 to the imaging surface S17 of the optical imaging system;
Semi-fov=81.0°, where Semi-FOV is the maximum half-field angle of the optical imaging system;
fno=1.23, where Fno is the f-number of the optical imaging system.
Fig. 2 shows the RMS spot diameter of the optical imaging system of example 1 at different angles of view in the first quadrant. As can be seen from fig. 2, 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 and 4. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 3 shows a schematic configuration 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 the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an optical filter E7, a cover glass E8, and an imaging surface S17.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The filter E7 has an object side surface S13 and an image side surface S14. The cover glass E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Alternatively, the operating band of the optical imaging system may be about 900nm to about 1000nm.
Table 5 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the optical imaging system of example 2, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
TABLE 5
As can be seen from table 5, in example 2, the object side surface and the image side surface of any one of the second lens element E2, the third lens element E3 and the fifth lens element E5 and the object side surface S11 of the sixth lens element E6 are aspherical surfaces; the image side surface S12 of the sixth lens E6 is an aspherical surface which is non-rotationally symmetrical.
Table 6 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 2, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Table 7 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surface S12 in embodiment 2, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S3 8.5362E-03 -1.5114E-03 1.5591E-04 -1.0640E-05 4.4872E-07 -1.0349E-08 1.1154E-10 -2.6334E-13 -1.4656E-14
S4 8.0757E-03 -1.0913E-03 -9.9866E-05 4.5553E-05 -6.4650E-06 4.2380E-07 -1.0656E-08 -2.0422E-11 6.1241E-13
S5 -5.7481E-03 -8.8351E-05 2.9671E-04 -2.8871E-04 1.0349E-04 -1.7316E-05 1.1418E-06 1.2902E-09 -1.1578E-09
S6 -2.5245E-03 -1.8136E-04 1.6786E-04 -9.2255E-05 2.3889E-05 -3.0835E-06 1.6705E-07 -8.3206E-10 -8.1754E-11
S9 -1.5765E-03 -5.7172E-06 -1.7877E-05 3.9907E-06 -5.0639E-07 2.9435E-08 -5.9346E-10 -1.4495E-12 -1.6209E-14
S10 -1.2945E-04 -1.3947E-03 2.4158E-04 -2.0890E-05 9.0850E-07 -1.1540E-08 5.5979E-11 -2.7607E-12 -6.1045E-13
S11 -8.4753E-03 2.9315E-03 -7.4480E-04 1.0011E-04 -7.0661E-06 2.6150E-07 -4.0271E-09 -4.5162E-12 -5.7430E-14
TABLE 6
TABLE 7
Table 8 shows effective focal lengths f1 to f6 of the respective lenses in embodiment 2, an effective focal length fx in the X-axis direction of the optical imaging system, an effective focal length fy in the Y-axis direction of the optical imaging system, an optical total length TTL of the optical imaging system, half of the diagonal length ImgH of the effective pixel region on the imaging surface S17, a maximum half field angle Semi-FOV, and an f-number Fno.
f1(mm) -10.41 fx(mm) 1.93
f2(mm) -9.04 fy(mm) 2.12
f3(mm) 17.79 TTL(mm) 24.30
f4(mm) 8.80 ImgH(mm) 2.90
f5(mm) 9.72 Semi-FOV(°) 81.9
f6(mm) 28.86 Fno 1.24
TABLE 8
Fig. 4 shows the RMS spot diameter of the optical imaging system of example 2 at different angles of view in the first quadrant. As can be seen from fig. 4, 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 and 6.
Fig. 5 shows a schematic configuration 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 the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an optical filter E7, a cover glass E8, and an imaging surface S17.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The filter E7 has an object side surface S13 and an image side surface S14. The cover glass E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Alternatively, the operating band of the optical imaging system may be about 900nm to about 1000nm.
Table 9 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the optical imaging system of example 3, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
TABLE 9
As can be seen from table 9, in example 3, the object side surface and the image side surface of any one of the second lens element E2 and the third lens element E3, the object side surface S9 of the fifth lens element E5, and the image side surface S12 of the sixth lens element E6 are aspherical surfaces; the image side surface S10 of the fifth lens element E5 and the object side surface S11 of the sixth lens element E6 are aspheric with respect to rotation.
Table 10 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 3, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Table 11 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surfaces S10 and S11 in embodiment 3, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S3 1.2477E-02 -1.6232E-03 1.4533E-04 -1.0604E-05 4.6503E-07 -1.0678E-08 6.0269E-11 5.5471E-13 4.1375E-14
S4 1.6927E-02 -1.1240E-03 -4.4020E-05 3.4697E-05 -5.9091E-06 4.2975E-07 -1.0329E-08 -2.8205E-10 1.4262E-11
S5 -1.6428E-03 -5.6625E-04 4.5430E-04 -3.0051E-04 1.0173E-04 -1.7688E-05 1.2170E-06 3.2413E-08 -6.1911E-09
S6 -7.4651E-04 -2.8689E-04 2.3357E-04 -1.0154E-04 2.3521E-05 -2.9305E-06 1.8039E-07 -4.1240E-09 1.9635E-11
S9 -3.4443E-04 -2.9005E-04 1.3400E-05 2.5069E-06 -9.0687E-07 1.0703E-08 1.8484E-09 3.5180E-10 -2.1996E-11
S12 8.5336E-03 1.7558E-03 -4.4644E-04 2.8096E-05 3.2187E-06 -5.4628E-07 1.0323E-08 1.5528E-09 -5.5499E-11
Table 10
/>
TABLE 11
Table 12 shows effective focal lengths f1 to f6 of the respective lenses in embodiment 3, an effective focal length fx in the X-axis direction of the optical imaging system, an effective focal length fy in the Y-axis direction of the optical imaging system, an optical total length TTL of the optical imaging system, half of the diagonal length ImgH of the effective pixel region on the imaging surface S17, a maximum half field angle Semi-FOV, and an f-number Fno.
f1(mm) -8.31 fx(mm) 2.30
f2(mm) -12.66 fy(mm) 2.06
f3(mm) 17.92 TTL(mm) 22.52
f4(mm) 11.49 ImgH(mm) 3.06
f5(mm) 2.18 Semi-FOV(°) 82.0
f6(mm) -2.61 Fno 1.23
Table 12
Fig. 6 shows the RMS spot diameter of the optical imaging system of example 3 at different angles of view in the first quadrant. As can be seen from fig. 6, the optical imaging system according to embodiment 3 can achieve good imaging quality.
Example 4
An optical imaging system according to embodiment 4 of the present application is described below with reference to fig. 7 and 8.
Fig. 7 shows a schematic configuration diagram of an optical imaging system according to embodiment 4 of the present application.
As shown in fig. 7, the optical imaging system according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an optical filter E7, a cover glass E8, and an imaging surface S17.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The filter E7 has an object side surface S13 and an image side surface S14. The cover glass E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Alternatively, the operating band of the optical imaging system may be about 900nm to about 1000nm.
Table 13 shows the surface types, the radius of curvature X, the radius of curvature Y, the thickness, the material, the conic coefficient X, and the conic coefficient Y of each lens of the optical imaging system of example 4, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
TABLE 13
As can be seen from table 13, in example 4, the object side surface and the image side surface of any one of the second lens element E2 and the third lens element E3, the object side surface S9 of the fifth lens element E5, and the image side surface S12 of the sixth lens element E6 are aspherical surfaces; the image side surface S10 of the fifth lens element E5 and the object side surface S11 of the sixth lens element E6 are aspheric with respect to rotation.
Table 14 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 4, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Table 15 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the non-rotationally symmetric aspherical surfaces S10 and S11 in embodiment 4, wherein the non-rotationally symmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S3 6.5769E-04 -1.0665E-03 1.3321E-04 -1.0117E-05 4.5381E-07 -1.0396E-08 4.7022E-11 3.5950E-13 1.0074E-13
S4 5.4022E-03 -1.2843E-03 3.2080E-05 3.4208E-05 -5.8331E-06 4.3014E-07 -1.2069E-08 -1.4731E-10 1.1466E-11
S5 -1.1736E-03 -4.5167E-04 4.5158E-04 -3.0160E-04 1.0185E-04 -1.7673E-05 1.2153E-06 3.1902E-08 -6.1719E-09
S6 1.4176E-03 -1.6059E-04 2.3131E-04 -9.9531E-05 2.3444E-05 -2.9345E-06 1.8107E-07 -4.0013E-09 1.2648E-11
S9 -5.7535E-04 -1.5179E-04 9.1798E-06 2.6207E-06 -9.0219E-07 1.0747E-08 1.8422E-09 3.5053E-10 -2.2038E-11
S12 3.8400E-03 1.3547E-03 -3.8505E-04 2.5845E-05 3.2611E-06 -5.4141E-07 1.0511E-08 1.5305E-09 -6.0244E-11
TABLE 14
/>
TABLE 15
Table 16 shows effective focal lengths f1 to f6 of the respective lenses in embodiment 4, an effective focal length fx in the X-axis direction of the optical imaging system, an effective focal length fy in the Y-axis direction of the optical imaging system, an optical total length TTL of the optical imaging system, half of the diagonal length ImgH of the effective pixel region on the imaging surface S17, a maximum half field angle Semi-FOV, and an f-number Fno.
f1(mm) -8.05 fx(mm) 1.84
f2(mm) -8.33 fy(mm) 2.08
f3(mm) 10.57 TTL(mm) 22.49
f4(mm) 10.69 ImgH(mm) 2.90
f5(mm) 2.72 Semi-FOV(°) 82.0
f6(mm) -3.99 Fno 1.24
Table 16
Fig. 8 shows the RMS spot diameter of the optical imaging system of example 4 at different angles of view in the first quadrant. As can be seen from fig. 8, the optical imaging system according to embodiment 4 can achieve good imaging quality.
Example 5
An optical imaging system according to embodiment 5 of the present application is described below with reference to fig. 9 and 10. Fig. 9 shows a schematic configuration diagram of an optical imaging system according to embodiment 5 of the present application.
As shown in fig. 9, the optical imaging system according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an optical filter E7, a cover glass E8, and an imaging surface S17.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The filter E7 has an object side surface S13 and an image side surface S14. The cover glass E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Alternatively, the operating band of the optical imaging system may be about 900nm to about 1000nm.
Table 17 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the optical imaging system of example 5, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
TABLE 17
As can be seen from table 17, in example 5, the object side surface and the image side surface of any one of the second lens element E2, the third lens element E3, and the fifth lens element E5 are aspherical surfaces; the object side surface S11 and the image side surface S12 of the sixth lens element E6 are aspheric with non-rotational symmetry.
Table 18 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 5, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Table 19 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surfaces S11 and S12 in embodiment 5, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A4 A16 A18 A20
S3 9.2753E-03 -1.4188E-03 1.5079E-04 -1.0527E-05 4.4981E-07 -1.0611E-08 1.0630E-10 2.6682E-34 2.6682E-34
S4 1.6801E-02 -5.7833E-04 -1.3441E-04 4.4818E-05 -6.3501E-06 4.2395E-07 -1.0467E-08 2.6682E-34 2.6682E-34
S5 -7.7460E-03 -6.1988E-04 2.5813E-04 -2.8440E-04 1.0386E-04 -1.7392E-05 1.1172E-06 2.6682E-34 2.6682E-34
S6 -3.7382E-03 1.2055E-04 9.1072E-05 -8.4173E-05 2.3584E-05 -3.1125E-06 1.6892E-07 2.6682E-34 2.6682E-34
S9 -2.7765E-04 -1.5933E-04 -1.9089E-05 4.1749E-06 -5.1648E-07 2.9308E-08 -5.7860E-10 2.6682E-34 2.6682E-34
S10 1.8011E-03 -1.3468E-03 2.4303E-04 -2.1127E-05 8.7167E-07 -1.3626E-08 7.9692E-33 2.6682E-34 2.6682E-34
TABLE 18
/>
TABLE 19
Table 20 shows effective focal lengths f1 to f6 of the respective lenses in embodiment 5, an effective focal length fx in the X-axis direction of the optical imaging system, an effective focal length fy in the Y-axis direction of the optical imaging system, an optical total length TTL of the optical imaging system, half of the diagonal length ImgH of the effective pixel region on the imaging surface S17, a maximum half field angle Semi-FOV, and an f-number Fno.
f1(mm) -12.84 fx(mm) 1.66
f2(mm) -6.98 fy(mm) 2.06
f3(mm) 12.47 TTL(mm) 22.72
f4(mm) 9.04 ImgH(mm) 3.40
f5(mm) 5.11 Semi-FOV(°) 81.0
f6(mm) -11.42 Fno 1.24
Table 20
Fig. 10 shows the RMS spot diameter of the optical imaging system of example 5 at different angles of view in the first quadrant. As can be seen from fig. 10, the optical imaging system provided in embodiment 5 can achieve good imaging quality.
Example 6
An optical imaging system according to embodiment 6 of the present application is described below with reference to fig. 11 and 12. Fig. 11 shows a schematic configuration diagram of an optical imaging system according to embodiment 6 of the present application.
As shown in fig. 11, the optical imaging system according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an optical filter E7, a cover glass E8, and an imaging surface S17.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The filter E7 has an object side surface S13 and an image side surface S14. The cover glass E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Alternatively, the operating band of the optical imaging system may be about 900nm to about 1000nm.
Table 21 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the optical imaging system of example 6, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
Table 21
As can be seen from table 21, in example 6, the object side surface and the image side surface of any one of the second lens element E2, the third lens element E3, and the fifth lens element E5 are aspherical surfaces; the object side surface S11 and the image side surface S12 of the sixth lens element E6 are aspheric with non-rotational symmetry.
Table 22 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 6, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Table 23 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the non-rotationally symmetric aspherical surfaces S11 and S12 in embodiment 6, wherein the non-rotationally symmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S3 9.2142E-03 -1.4198E-03 1.5174E-04 -1.0551E-05 4.4981E-07 -1.0611E-08 1.0630E-10 2.6682E-34 2.6682E-34
S4 1.4071E-02 -1.1939E-03 -2.7911E-05 4.0488E-05 -6.3501E-06 4.2395E-07 -1.0467E-08 2.6682E-34 2.6682E-34
S5 -7.8074E-03 -8.1281E-04 4.5880E-04 -3.2754E-04 1.0386E-04 -1.7392E-05 1.1172E-06 2.6682E-34 2.6682E-34
S6 -3.0777E-03 -3.7727E-04 2.2446E-04 -9.6904E-05 2.3584E-05 -3.1125E-06 1.6892E-07 2.6682E-34 2.6682E-34
S9 -8.7949E-04 -1.6045E-05 -2.1818E-05 4.0728E-06 -5.1648E-07 2.9308E-08 -5.7860E-10 2.6682E-34 2.6682E-34
S10 -3.4681E-03 -1.1948E-03 2.5207E-04 -2.1384E-05 8.7167E-07 -1.3626E-08 7.9692E-33 2.6682E-34 2.6682E-34
Table 22
/>
Table 23
Table 24 shows effective focal lengths f1 to f6 of the respective lenses in embodiment 6, an effective focal length fx in the X-axis direction of the optical imaging system, an effective focal length fy in the Y-axis direction of the optical imaging system, an optical total length TTL of the optical imaging system, half of the diagonal length ImgH of the effective pixel region on the imaging surface S17, a maximum half field angle Semi-FOV, and an f-number Fno.
Table 24
Fig. 12 shows the RMS spot diameter of the optical imaging system of example 6 at different angles of view in the first quadrant. As can be seen from fig. 12, the optical imaging system according to embodiment 6 can achieve good imaging quality.
Example 7
An optical imaging system according to embodiment 7 of the present application is described below with reference to fig. 13 and 14. Fig. 13 shows a schematic configuration diagram of an optical imaging system according to embodiment 7 of the present application.
As shown in fig. 13, the optical imaging system according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an optical filter E7, a cover glass E8, and an imaging surface S17.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The filter E7 has an object side surface S13 and an image side surface S14. The cover glass E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Alternatively, the operating band of the optical imaging system may be about 900nm to about 1000nm.
Table 25 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the optical imaging system of example 7, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
/>
Table 25
As can be seen from table 25, in example 7, the object side surface and the image side surface of any one of the second lens element E2, the third lens element E3 and the fifth lens element E5, and the image side surface S12 of the sixth lens element E6 are aspheric; the object side surface S11 of the sixth lens element E6 is an aspheric surface with non-rotational symmetry.
Table 26 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 7, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Table 27 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surface S11 in embodiment 7, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S3 8.7701E-03 -1.5572E-03 1.5395E-04 -1.0280E-05 4.4991E-07 -1.1207E-08 2.9490E-11 -1.2241E-12 3.1813E-13
S4 1.1438E-02 -1.3313E-03 -3.6440E-05 3.8439E-05 -5.4791E-06 3.8841E-07 -6.1005E-09 -1.7553E-09 1.1951E-10
S5 -1.7242E-03 -4.2926E-04 4.4348E-04 -3.0254E-04 1.0194E-04 -1.7657E-05 1.2150E-06 3.1509E-08 -6.1677E-09
S6 -5.6388E-05 -2.8174E-04 2.4349E-04 -1.0122E-04 2.3417E-05 -2.9394E-06 1.8115E-07 -3.9012E-09 1.8907E-11
S9 -5.5945E-04 -2.3789E-04 1.6017E-05 2.4080E-06 -9.0449E-07 1.1043E-08 1.8353E-09 3.4641E-10 -2.1926E-11
S10 -7.2362E-03 -4.9299E-04 2.0981E-04 -2.2827E-05 9.7178E-07 5.3798E-11 -1.5348E-10 -1.2380E-10 6.1584E-12
S12 1.4322E-03 2.0664E-03 -4.5421E-04 2.8400E-05 3.3109E-06 -5.3703E-07 1.0617E-08 1.5104E-09 -6.4027E-11
Table 26
Table 27
Table 28 shows effective focal lengths f1 to f6 of the respective lenses in embodiment 7, an effective focal length fx in the X-axis direction of the optical imaging system, an effective focal length fy in the Y-axis direction of the optical imaging system, an optical total length TTL of the optical imaging system, half of the diagonal length ImgH of the effective pixel region on the imaging surface S17, a maximum half field angle Semi-FOV, and an f-number Fno.
f1(mm) -7.60 fx(mm) 2.29
f2(mm) -9.69 fy(mm) 2.06
f3(mm) 16.27 TTL(mm) 23.47
f4(mm) 12.76 ImgH(mm) 3.08
f5(mm) 1.86 Semi-FOV(°) 82.0
f6(mm) -2.10 Fno 1.23
Table 28
Fig. 14 shows the RMS spot diameter of the optical imaging system of example 7 at different angles of view in the first quadrant. As can be seen from fig. 14, the optical imaging system provided in embodiment 7 can achieve good imaging quality.
Example 8
An optical imaging system according to embodiment 8 of the present application is described below with reference to fig. 15 and 16. Fig. 15 shows a schematic configuration diagram of an optical imaging system according to embodiment 8 of the present application.
As shown in fig. 15, the optical imaging system according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an optical filter E7, a cover glass E8, and an imaging surface S17.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The filter E7 has an object side surface S13 and an image side surface S14. The cover glass E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Alternatively, the operating band of the optical imaging system may be about 900nm to about 1000nm.
Table 29 shows the surface types, the radius of curvature X, the radius of curvature Y, the thickness, the material, the conic coefficient X, and the conic coefficient Y of each lens of the optical imaging system of example 8, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
Table 29
As can be seen from table 29, in example 8, the object side surface and the image side surface of any one of the second lens element E2, the third lens element E3 and the fifth lens element E5, and the image side surface S12 of the sixth lens element E6 are aspherical surfaces; the object side surface S11 of the sixth lens element E6 is an aspheric surface with non-rotational symmetry.
Table 30 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 8, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Table 31 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surface S11 in embodiment 8, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S3 8.8360E-03 -1.5388E-03 1.5267E-04 -1.0554E-05 4.6861E-07 -1.1050E-08 6.0920E-11 -1.6274E-13 8.2132E-14
S4 1.3097E-02 -1.4560E-03 -1.0086E-05 3.5271E-05 -6.0041E-06 4.4352E-07 -8.4957E-09 -4.5674E-10 6.8987E-12
S5 -2.0389E-03 -5.5807E-04 4.6078E-04 -3.0149E-04 1.0168E-04 -1.7717E-05 1.2183E-06 3.2875E-08 -6.2463E-09
S6 -4.9918E-04 -3.0300E-04 2.3409E-04 -1.0101E-04 2.3558E-05 -2.9320E-06 1.7866E-07 -4.3498E-09 7.0752E-11
S9 -4.0109E-04 -2.7583E-04 2.1110E-05 2.3575E-06 -9.2612E-07 9.4350E-09 1.8843E-09 3.5672E-10 -2.2163E-11
S10 -7.1203E-03 -4.7062E-04 2.1118E-04 -2.2715E-05 9.6859E-07 -3.2839E-10 -1.9901E-10 -1.2602E-10 6.5908E-12
S12 9.6644E-04 2.2173E-03 -4.7346E-04 2.8669E-05 3.3904E-06 -5.3614E-07 1.0119E-08 1.4751E-09 -6.0626E-11
Table 30
Table 31
Table 32 shows effective focal lengths f1 to f6 of the respective lenses in embodiment 8, an effective focal length fx in the X-axis direction of the optical imaging system, an effective focal length fy in the Y-axis direction of the optical imaging system, an optical total length TTL of the optical imaging system, half of the diagonal length ImgH of the effective pixel region on the imaging surface S17, a maximum half field angle Semi-FOV, and an f-number Fno.
f1(mm) -8.89 fx(mm) 1.84
f2(mm) -8.12 fy(mm) 2.06
f3(mm) 17.64 TTL(mm) 24.18
f4(mm) 11.67 ImgH(mm) 3.00
f5(mm) 1.80 Semi-FOV(°) 82.0
f6(mm) -1.90 Fno 1.24
Table 32
Fig. 16 shows the RMS spot diameter of the optical imaging system of example 8 at different angles of view in the first quadrant. As can be seen from fig. 16, the optical imaging system according to embodiment 8 can achieve good imaging quality.
Example 9
An optical imaging system according to embodiment 9 of the present application is described below with reference to fig. 17 and 18. Fig. 17 shows a schematic configuration diagram of an optical imaging system according to embodiment 9 of the present application.
As shown in fig. 17, the optical imaging system according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an optical filter E7, a cover glass E8, and an imaging surface S17.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. The cover glass E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Alternatively, the operating band of the optical imaging system may be about 900nm to about 1000nm.
Table 33 shows the surface types, the radius of curvature X, the radius of curvature Y, the thickness, the material, the conic coefficient X, and the conic coefficient Y of each lens of the optical imaging system of example 9, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
/>
Table 33
As can be seen from table 33, in example 9, the object side surface and the image side surface of any one of the second lens element E2, the third lens element E3, and the sixth lens element E6 are aspherical surfaces; the object side surface S9 and the image side surface S10 of the fifth lens element E5 are aspheric with non-rotational symmetry.
Table 34 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 9, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Table 35 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the non-rotationally symmetric aspherical surfaces S9 and S10 in embodiment 9, wherein the non-rotationally symmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S3 1.0110E-02 -1.3774E-03 1.4899E-04 -1.0988E-05 4.6048E-07 -9.1928E-09 9.1272E-11 -3.7194E-12 9.8965E-14
S4 1.0763E-02 -1.0693E-03 -4.6863E-05 3.8415E-05 -6.3839E-06 4.2791E-07 -9.9302E-09 7.8916E-11 -1.0516E-11
S5 -4.8965E-03 -7.6780E-04 4.3807E-04 -2.9693E-04 9.9285E-05 -1.7472E-05 1.2551E-06 2.2233E-08 -5.6387E-09
S6 -4.7380E-04 -3.8467E-04 1.9340E-04 -9.4262E-05 2.3497E-05 -3.0866E-06 1.7395E-07 -2.4834E-11 -2.2585E-10
S11 -1.0152E-02 3.0801E-03 -7.2909E-04 9.9755E-05 -7.0919E-06 2.6211E-07 -3.9411E-09 -8.6012E-12 -1.6336E-12
S12 -3.8406E-03 2.6366E-03 -3.8408E-04 -3.9655E-06 5.0231E-06 -3.7604E-07 8.5900E-09 -2.5062E-10 1.5991E-11
Watch 34
Table 35
Table 36 shows effective focal lengths f1 to f6 of the respective lenses in embodiment 9, an effective focal length fx in the X-axis direction of the optical imaging system, an effective focal length fy in the Y-axis direction of the optical imaging system, an optical total length TTL of the optical imaging system, half of the diagonal length ImgH of the effective pixel region on the imaging surface S17, a maximum half field angle Semi-FOV, and an f-number Fno.
f1(mm) -9.75 fx(mm) 1.95
f2(mm) -9.66 fy(mm) 2.07
f3(mm) 11.78 TTL(mm) 24.55
f4(mm) 9.53 ImgH(mm) 2.99
f5(mm) -19.15 Semi-FOV(°) 81.9
f6(mm) 7.73 Fno 1.24
Table 36
Fig. 18 shows the RMS spot diameter of the optical imaging system of example 9 at different angles of view in the first quadrant. As can be seen from fig. 18, the optical imaging system as shown in embodiment 9 can achieve good imaging quality.
Example 10
An optical imaging system according to embodiment 10 of the present application is described below with reference to fig. 19 and 20. Fig. 19 shows a schematic configuration diagram of an optical imaging system according to embodiment 10 of the present application.
As shown in fig. 19, the optical imaging system according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an optical filter E7, a cover glass E8, and an imaging surface S17.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is concave and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The filter E7 has an object side surface S13 and an image side surface S14. The cover glass E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Alternatively, the operating band of the optical imaging system may be about 900nm to about 1000nm.
Table 37 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the optical imaging system of example 10, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
/>
Table 37
As can be seen from table 37, in example 10, the object side surface and the image side surface of either one of the second lens element E2 and the third lens element E3 are aspherical surfaces; the object side surface and the image side surface of any one of the fifth lens element E5 and the sixth lens element E6 are aspheric surfaces that are rotationally asymmetric.
Table 38 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 10, where each of the aspherical surface types can be defined by equation (1) given in example 1 above. Table 39 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surfaces S9 to S12 in embodiment 10, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S3 7.4657E-03 -1.2736E-03 1.5192E-04 -1.1663E-05 4.8264E-07 -5.3858E-09 -3.8632E-11 -1.6060E-11 6.1808E-13
S4 7.3932E-03 -8.0831E-04 -5.3354E-05 4.1671E-05 -6.4869E-06 4.2155E-07 -7.7839E-09 3.4502E-10 -2.5824E-11
S5 -4.8449E-03 2.5830E-04 3.6098E-04 -2.8431E-04 1.0359E-04 -1.7318E-05 1.1250E-06 -4.5116E-09 1.6509E-09
S6 -4.6664E-03 3.8493E-06 2.0535E-04 -9.3554E-05 2.3448E-05 -3.0830E-06 1.7715E-07 4.0140E-10 -3.1042E-10
Table 38
Table 39
Table 40 shows effective focal lengths f1 to f6 of the respective lenses in embodiment 10, an effective focal length fx in the X-axis direction of the optical imaging system, an effective focal length fy in the Y-axis direction of the optical imaging system, an optical total length TTL of the optical imaging system, half of the diagonal length ImgH of the effective pixel area on the imaging surface S17, a maximum half field angle Semi-FOV, and an f-number Fno.
f1(mm) -8.21 fx(mm) 2.20
f2(mm) -10.93 fy(mm) 2.07
f3(mm) -500.00 TTL(mm) 24.05
f4(mm) 7.11 ImgH(mm) 2.90
f5(mm) 7.53 Semi-FOV(°) 81.9
f6(mm) 19.37 Fno 1.24
Table 40
Fig. 20 shows the RMS spot diameter of the optical imaging system of example 10 at different angles of view in the first quadrant. As can be seen from fig. 20, the optical imaging system according to embodiment 10 can achieve good imaging quality.
In summary, embodiments 1 to 10 satisfy the relationships shown in table 41, respectively.
Table 41
The application also provides an image pickup device, wherein the electronic photosensitive element can be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device may be a stand-alone imaging apparatus such as a digital camera, or may be an imaging module integrated on a mobile electronic apparatus such as a cellular phone. The image pickup apparatus is equipped with the optical imaging system described above.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.

Claims (8)

1. The optical imaging system sequentially comprises, from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens having optical power,
It is characterized in that the method comprises the steps of,
The first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has negative focal power, and the image side surface of the second lens is a concave surface;
The image side surface of the third lens is a convex surface;
the fourth lens has positive focal power;
The object side surface of the fifth lens is a convex surface;
The third lens has positive focal power, at least one of the fifth lens and the sixth lens has positive focal power, or the third lens has negative focal power, and both the fifth lens and the sixth lens have positive focal power;
the number of lenses having optical power in the optical imaging system is six;
at least one of the fifth to sixth lenses has an aspherical surface that is non-rotationally symmetrical; and
The effective focal length fx of the optical imaging system in the X-axis direction and the effective focal length fy of the optical imaging system in the Y-axis direction meet 0.5 < fx/fy less than or equal to 0.94 or 1.06 < fx/fy less than or equal to 1.5;
The center thickness CT5 of the fifth lens on the optical axis and the center thickness CT6 of the sixth lens on the optical axis meet the conditions that CT5/CT6 is more than 2.5 and less than 4.5;
the curvature radius R9 of the object side surface of the fifth lens and the effective focal length fx of the optical imaging system in the X-axis direction meet the conditions that R9/fx is more than 1.5 and less than 3.5;
The distance T12 between the first lens and the second lens on the optical axis, the distance T34 between the third lens and the fourth lens on the optical axis, the distance T56 between the fifth lens and the sixth lens on the optical axis and the distance TTL between the object side surface of the first lens and the imaging surface of the optical imaging system on the optical axis satisfy 0.10-12+T34+T56)/TTL-0.22.
2. The optical imaging system of claim 1, wherein an effective focal length f1 of the first lens and an effective focal length f2 of the second lens satisfy 0.5 < f1/f2 < 2.0.
3. The optical imaging system of claim 1, wherein a radius of curvature R2 of an image side of the first lens and an effective focal length fx of the optical imaging system in an X-axis direction satisfy 1.5 < R2/fx < 3.5.
4. The optical imaging system according to claim 1, wherein a radius of curvature R4 of the image side of the second lens and an effective focal length fx in the X-axis direction of the optical imaging system satisfy 0.5 < R4/fx < 3.5.
5. The optical imaging system of claim 1, wherein a center thickness CT4 of the fourth lens on the optical axis and a center thickness CT3 of the third lens on the optical axis satisfy 1.5 < CT4/CT3 < 3.
6. The optical imaging system of any of claims 1 to 5, wherein a maximum half field angle Semi-FOV of the optical imaging system satisfies 85 ° > Semi-FOV > 80 °.
7. The optical imaging system according to any one of claims 1 to 5, characterized in that the f-number Fno of the optical imaging system satisfies 1.1 < Fno < 1.5.
8. The optical imaging system of any of claims 1 to 5, wherein the optical imaging system has an operating band of 900nm to 1000nm.
CN201811579987.1A 2018-12-24 2018-12-24 Optical imaging system Active CN109375348B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811579987.1A CN109375348B (en) 2018-12-24 2018-12-24 Optical imaging system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811579987.1A CN109375348B (en) 2018-12-24 2018-12-24 Optical imaging system

Publications (2)

Publication Number Publication Date
CN109375348A CN109375348A (en) 2019-02-22
CN109375348B true CN109375348B (en) 2024-05-14

Family

ID=65371665

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811579987.1A Active CN109375348B (en) 2018-12-24 2018-12-24 Optical imaging system

Country Status (1)

Country Link
CN (1) CN109375348B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI706185B (en) 2019-11-01 2020-10-01 大立光電股份有限公司 Imaging optical system, image capturing unit and electronic device
CN110927933B (en) * 2019-12-24 2021-10-15 浙江舜宇光学有限公司 Optical imaging lens group
CN113267872B (en) * 2020-02-14 2024-03-08 宁波舜宇车载光学技术有限公司 Optical lens and electronic device
CN114911040B (en) * 2022-05-09 2024-04-05 广东省星聚宇光学股份有限公司 Infrared lens and infrared lens module

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104656232A (en) * 2013-11-21 2015-05-27 三星电子株式会社 Photographing Lens Group And Electronic Apparatus Including The Same
CN104898257A (en) * 2015-03-11 2015-09-09 瑞声声学科技(深圳)有限公司 Camera lens system
CN207488602U (en) * 2017-11-23 2018-06-12 江西联益光学有限公司 Small-sized wide-angle lens
CN208172361U (en) * 2018-06-09 2018-11-30 辽宁中蓝电子科技有限公司 A kind of large aperture high-pixel mobile phone lens
CN209327658U (en) * 2018-12-24 2019-08-30 浙江舜宇光学有限公司 Optical imaging system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104656232A (en) * 2013-11-21 2015-05-27 三星电子株式会社 Photographing Lens Group And Electronic Apparatus Including The Same
CN104898257A (en) * 2015-03-11 2015-09-09 瑞声声学科技(深圳)有限公司 Camera lens system
CN207488602U (en) * 2017-11-23 2018-06-12 江西联益光学有限公司 Small-sized wide-angle lens
CN208172361U (en) * 2018-06-09 2018-11-30 辽宁中蓝电子科技有限公司 A kind of large aperture high-pixel mobile phone lens
CN209327658U (en) * 2018-12-24 2019-08-30 浙江舜宇光学有限公司 Optical imaging system

Also Published As

Publication number Publication date
CN109375348A (en) 2019-02-22

Similar Documents

Publication Publication Date Title
CN108469669B (en) Image pickup lens
CN108732724B (en) Optical imaging system
CN109298515B (en) Image pickup lens
CN109581631B (en) Imaging lens
CN109782418B (en) Optical imaging lens
CN109283665B (en) Imaging lens
CN109116520B (en) Optical imaging lens
CN108761737B (en) Optical imaging system
CN117741916A (en) Optical imaging lens group
CN109375349B (en) Imaging lens
CN109407278B (en) Imaging lens
CN109212721B (en) Image pickup lens group
CN109375348B (en) Optical imaging system
CN110262015B (en) Optical imaging system
CN109407280B (en) Imaging lens
CN109270661B (en) Image pickup lens group
CN110596864B (en) Optical imaging system
CN109445072B (en) Image pickup lens group
CN110045488B (en) Optical imaging lens
CN114236754A (en) Optical imaging system
CN109521554B (en) Image pickup lens group
CN110187479B (en) Optical imaging lens
WO2019233143A1 (en) Optical imaging lens set
CN110286474B (en) Optical imaging system
CN109298514B (en) Optical imaging lens group

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