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CN116338903B - Optical imaging system - Google Patents

Optical imaging system

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Publication number
CN116338903B
CN116338903B CN202310322621.0A CN202310322621A CN116338903B CN 116338903 B CN116338903 B CN 116338903B CN 202310322621 A CN202310322621 A CN 202310322621A CN 116338903 B CN116338903 B CN 116338903B
Authority
CN
China
Prior art keywords
lens
image side
spacer
imaging system
optical imaging
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
CN202310322621.0A
Other languages
Chinese (zh)
Other versions
CN116338903A (en
Inventor
杜娜
熊涛
张变
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 CN202310322621.0A priority Critical patent/CN116338903B/en
Publication of CN116338903A publication Critical patent/CN116338903A/en
Application granted granted Critical
Publication of CN116338903B publication Critical patent/CN116338903B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/023—Mountings, adjusting means, or light-tight connections, for optical elements for lenses permitting adjustment
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles

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

Abstract

本申请公开了一种光学成像系统，该光学成像系统包括镜筒以及置于镜筒内的镜片组和多个隔离件，其中，镜片组沿着光轴由物侧至像侧依序包括：第一镜片、第二镜片、第三镜片、第四镜片、第五镜片、第六镜片以及第七镜片；以及多个隔离件包括：第三隔离件、第四隔离件以及第六隔离件；第一镜片至第七镜片中第四镜片在光轴上的中心厚度最大；第三镜片与第四镜片中至少一镜片具有正光焦度；第四镜片的有效焦距f4、第四隔离件沿光轴方向的最大厚度CP4、第三镜片的有效焦距f3与第三隔离件沿光轴方向的最大厚度CP3满足：8.5<|f4/CP4+CP3/f3|<30.0；第六隔离件的物侧面的内径d6s、第六隔离件的像侧面的内径d6m、第六镜片的像侧面的曲率半径R12与第七镜片的物侧面的曲率半径R13满足：5.0<(d6m+d6s)/(R12‑R13)<9.0。

This application discloses an optical imaging system, which includes a lens barrel, a lens assembly disposed within the lens barrel, and multiple spacers. The lens assembly, along the optical axis from the object side to the image side, sequentially includes: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The multiple spacers include: a third spacer, a fourth spacer, and a sixth spacer. Among the first to seventh lenses, the fourth lens has the largest center thickness along the optical axis. At least one of the third and fourth lenses has positive optical power. The fourth lens… The effective focal length f4 of the lens, the maximum thickness CP4 of the fourth isolator along the optical axis, the effective focal length f3 of the third lens, and the maximum thickness CP3 of the third isolator along the optical axis satisfy: 8.5 < |f4/CP4 + CP3/f3| <30.0; the inner diameter d6s of the object side of the sixth isolator, the inner diameter d6m of the image side of the sixth isolator, the radius of curvature R12 of the image side of the sixth lens, and the radius of curvature R13 of the object side of the seventh lens satisfy: 5.0 < (d6m + d6s) / (R12 - R13) < 9.0.

Description

Optical imaging system
Technical Field
The application relates to the field of optical elements, in particular to an optical imaging system.
Background
With the high-speed development of smart phones, the thickness of the smart phones is getting thinner and thinner. This also limits the length of the phone lens so that the phone lens needs to be limited to a small space. The length of the lens is one of the important factors limiting the imaging quality of the lens, and in order to meet the requirements of customers, the overall design can make the thickness of the lens and the air interval too thin, but the instability of processing and assembly is increased, the transition of light rays is uneven, various aberrations are increased, and the resolution of the lens is reduced.
In order to overcome the limitation of the thickness of the mobile phone, the telescopic imaging lens becomes one of the hot spots in current research. The telescopic imaging lens can realize the telescopic function of the lens in a space limited by the thickness of the smart phone, namely, in a working state, the lens is in an extending state, at the moment, the whole optical system has a longer length, light can smoothly strike an image surface, so that the lens has higher resolution power, and in a non-working state, the lens is in a contracted state, and the lens cannot protrude out of the surface of a rear shell of the smart phone. However, the telescopic imaging lens generally has the problems of large rear-end lens segment difference and poor assembly stability, and the front-end lens of the telescopic imaging lens has high sensitivity, and the internal reflection stray light phenomenon is easily caused by unreasonable thickness of each lens and the distribution of the isolating pieces.
Disclosure of Invention
The application provides an optical imaging system, which comprises a lens barrel, a lens group and a plurality of isolating pieces, wherein the lens group is arranged in the lens barrel and sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an image side along an optical axis; the plurality of spacers includes a third spacer disposed on the image side of the third lens and contacting the image side portion of the third lens, a fourth spacer disposed on the image side of the fourth lens and contacting the image side portion of the fourth lens, and a sixth spacer disposed on the image side of the sixth lens and contacting the image side portion of the sixth lens, wherein a center thickness of the fourth lens on the optical axis is largest among the first to seventh lenses, at least one of the third lens and the fourth lens has positive optical power, an effective focal length f4 of the fourth lens, a maximum thickness CP4 of the fourth spacer in the optical axis direction, an effective focal length f3 of the third lens and a maximum thickness CP3 of the third spacer in the optical axis direction satisfy a radius d6s of the object side of 8.5< |f4/CP4+cp3/f3| <30.0, an inner radius d6m of the image side of the sixth spacer, a radius R12 of the image side of the sixth lens and a radius R6 of curvature of the image side of the seventh lens satisfy a radius R6/R6 of the image side of the sixth lens satisfy a radius of curvature of 8.5+3/d 6.13+r 6.
In one embodiment, the sign of the curvature radius of the object side surface and the image side surface of the sixth lens are different, the sign of the curvature radius of the object side surface and the image side surface of the seventh lens are different, and the maximum thickness CP6 of the object side surface of the sixth lens, the curvature radius R11 of the object side surface of the sixth lens, the curvature radius R12 of the object side surface of the seventh lens, the curvature radius R13 of the image side surface of the seventh lens and the sixth spacer in the optical axis direction satisfies-3.0 < (R11/R12+R13/R14). Times.CP6 <0.
In one embodiment, the distance EP34 from the image side surface of the third spacer to the object side surface of the fourth spacer along the optical axis direction, the center thickness CT3 of the third lens on the optical axis, the maximum thickness CP4 of the fourth spacer along the optical axis direction, and the air interval T45 between the fourth lens and the fifth lens on the optical axis satisfy 1.5< EP34/CT3+CP4/T45<5.5.
In one embodiment, the effective focal length f4 of the fourth lens, the distance EP34 in the optical axis direction from the image side of the third spacer to the object side of the fourth spacer satisfies 11.0< |f4/EP34| <21.0.
In one embodiment, the radius of curvature R8 of the image side of the fourth lens and the maximum thickness CP4 of the fourth separator in the direction of the optical axis satisfy-40.5 < R8/CP4< -4.0.
In one embodiment, the maximum thickness CP4 of the fourth spacer along the optical axis and the center thickness CT4 of the fourth lens on the optical axis satisfy CP4/CT4<1.0.
In one embodiment, the plurality of spacers further comprises a fifth spacer disposed at an image side of the fifth lens and in contact with an image side portion of the fifth lens, wherein an effective focal length f6 of the sixth lens, a spacing distance EP56 of the image side of the fifth spacer to an object side of the sixth spacer in an optical axis direction, and a maximum thickness CP6 of the sixth spacer in the optical axis direction satisfy 2.0< f 6/(EP 56+CP6) <6.2.
In one embodiment, the plurality of spacers further comprises a fifth spacer disposed on the image side of the fifth lens and in contact with the image side portion of the fifth lens, wherein an outer diameter D5s of the object side of the fifth spacer, an outer diameter D5m of the image side of the fifth spacer, a radius of curvature R10 of the image side of the fifth lens, and a radius of curvature R11 of the object side of the sixth lens satisfy 0.5< D5s/R10+D5m/R11<6.5.
In one embodiment, the effective focal length f of the optical imaging system, the maximum half field angle of the optical imaging system, semi-FOV, the outer diameter D0m of the image side end face of the barrel, and the outer diameter D0s of the object side end face of the barrel satisfy 9.5< f/tan (Semi-FOV) +D0m/D0s <12.5.
In one embodiment, the plurality of spacers further comprises a second spacer disposed on the image side of the second lens and in contact with the image side portion of the second lens, wherein a radius of curvature R4 of the image side of the second lens, a radius of curvature R5 of the object side of the third lens, a distance EP23 from the image side of the second spacer to the object side of the third spacer in the optical axis direction, and a maximum thickness CP2 of the second spacer in the optical axis direction satisfy 19.0< R4/R5+EP23/CP2<57.0.
In one embodiment, the effective focal length f of the optical imaging system, the maximum half field angle Semi-FOV of the optical imaging system, and the maximum height L of the lens barrel in the optical axis direction satisfy f/L×tan (Semi-FOV) <1.0.
In one embodiment, the plurality of spacers further comprises a first spacer disposed at the image side of the first lens and in contact with the image side portion of the first lens, wherein an outer diameter D1s of the object side of the first spacer, a distance EP01 from the object side end surface of the lens barrel to the object side surface of the first spacer in the optical axis direction, a maximum height L of the lens barrel in the optical axis direction, and a distance TD from the object side surface of the first lens to the image side surface of the seventh lens in the optical axis direction satisfy 5.0< D1s/EP01+L/TD <9.5.
In one embodiment, the plurality of spacers further comprises a second spacer disposed on the image side of the second lens and in contact with the image side portion of the second lens, wherein a distance TD on the optical axis from the object side of the first lens to the image side of the seventh lens, a spacing distance EP23 in the optical axis direction from the image side of the second spacer to the object side of the third spacer, and a distance EP34 in the optical axis direction from the image side of the third spacer to the object side of the fourth spacer satisfy 3.5< TD/(EP 23+EP 34) <6.5.
The application provides a seven-piece optical imaging system, which ensures the processing and structural stability of a lens and reduces the influence of stray light on imaging by adjusting the thickness of part of lenses and the distribution of isolating pieces. The optical imaging system provided by the application also meets the conditions that 8.5< |f4/CP4+CP3/f3| <30.0 and 5.0< (d6m+d6s)/(R12-R13) <9.0 on the basis of thickening the center thickness of the fourth lens, the thickness of the third isolation piece and the thickness of the fourth isolation piece are restrained by adjusting the effective focal length of the fourth lens and the effective focal length of the third lens, the interval between the related lenses can be effectively adjusted, meanwhile, the inner diameter of the object side surface and the inner diameter of the image side surface of the sixth isolation piece are restrained by adjusting the curvature radius of the sixth lens and the seventh lens, the molding stability of the lenses is ensured, the sensitivity of the front lens and the assembly stability of the rear lens can be reduced as a whole, and the stability performance of the lens group in a reliability experiment can be effectively improved.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:
FIG. 1 shows a schematic diagram of a structural layout and some parameters of an optical imaging system according to the present application;
Fig. 2A and 2B show a schematic configuration diagram of an optical imaging system according to embodiment 1 of the present application;
Fig. 3A to 3C show an on-axis chromatic aberration curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging system according to embodiment 1 of the present application;
fig. 4A and 4B show a schematic structural view of an optical imaging system according to embodiment 2 of the present application;
fig. 5A to 5C show an on-axis chromatic aberration curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging system according to embodiment 2 of the present application;
fig. 6A and 6B show a schematic structural view of an optical imaging system according to embodiment 3 of the present application;
Fig. 7A to 7C show an on-axis chromatic aberration curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging system according to embodiment 3 of the present application;
Fig. 8A and 8B show a schematic configuration of an optical imaging system according to embodiment 4 of the present application, and
Fig. 9A to 9C show an on-axis chromatic aberration curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging system according to embodiment 4 of the present application.
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, it means that the lens surface is convex at least in the paraxial region, and 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. The surface of each lens close to the object is referred to as the object side of the lens, and the surface of each lens close to the imaging surface is referred to as the image side of the lens.
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 following examples merely illustrate a few embodiments of the present application, which are described in greater detail and are not to be construed as limiting the scope of the application. It should be noted that, for those skilled in the art, several modifications and improvements may be made without departing from the concept of the present application, which are all within the scope of the present application, for example, the lens group, the lens barrel and the spacer in each embodiment of the present application may be arbitrarily combined, and the lens group in one embodiment is not limited to be combined with the lens barrel, the spacer, etc. in this embodiment.
The application will be described in detail below with reference to the drawings in connection with embodiments. Fig. 1 shows a schematic diagram of a structural layout and some parameters of an optical imaging system according to the present application. It will be appreciated by those skilled in the art that some parameters of the lenses, such as the center thickness CT3 of the third lens on the optical axis, are often used in the art are not shown in fig. 1, and fig. 1 illustrates only some parameters of the barrel and spacer of one optical imaging system of the present application for a better understanding of the present application. As shown in fig. 1, EP34 represents a distance between the image side surface of the third separator and the object side surface of the fourth separator in the optical axis direction, CP1 represents a maximum thickness of the first separator in the optical axis direction, CP3 represents a maximum thickness of the third separator in the optical axis direction, CP4 represents a maximum thickness of the fourth separator in the optical axis direction, CP6 represents a maximum thickness of the sixth separator in the optical axis direction, D0s represents an outer diameter of the object side end surface of the lens barrel, D0s represents an inner diameter of the object side end surface of the lens barrel, D3s represents an outer diameter of the object side surface of the third separator, D3m represents an outer diameter of the image side surface of the third separator, D1s represents an outer diameter of the object side surface of the first separator, D1m represents an outer diameter of the object side surface of the first separator, D3s represents an inner diameter of the object side surface of the third separator, D3m represents an inner diameter of the object side surface of the third separator, D3s represents an inner diameter of the object side surface of the third separator, D1s represents an inner diameter of the object side surface of the sixth separator, D4s represents an inner diameter of the object side surface of the fourth separator, D4s represents an inner diameter of the object side surface of the sixth separator, D6s represents an outer diameter of the object side surface of the fourth separator, D4s represents an outer diameter of the object side surface of the sixth separator, D6s represents an outer diameter of the object side surface of the fourth separator, D3s represents the object side of the fourth separator represents the object side surface.
An optical imaging system according to an exemplary embodiment of the present application includes a lens barrel, a lens group disposed within the lens barrel, and a plurality of spacers. The lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an image side along the optical axis.
In an exemplary embodiment, the plurality of spacers may include a third spacer, a fourth spacer, and a sixth spacer. The third spacer is disposed on the image side of the third lens and is in contact with the image side portion of the third lens, the fourth spacer is disposed on the image side of the fourth lens and is in contact with the image side portion of the fourth lens, and the sixth spacer is disposed on the image side of the sixth lens and is in contact with the image side portion of the sixth lens.
In an exemplary embodiment, the center thickness of the fourth lens on the optical axis is the largest among the first to seventh lenses.
In an exemplary embodiment, at least one of the third lens and the fourth lens has positive optical power.
In an exemplary embodiment, the optical imaging system according to the present application may satisfy 8.5< |f4/CP4+cp3/f3| <30.0, where f4 is an effective focal length of the fourth lens, CP4 is a maximum thickness of the fourth spacer in the optical axis direction, f3 is an effective focal length of the third lens, and CP3 is a maximum thickness of the third spacer in the optical axis direction.
In an exemplary embodiment, the optical imaging system according to the present application may satisfy 5.0< (d6m+d6s)/(R12-R13) <9.0, where d6s is the inner diameter of the object side of the sixth spacer, d6m is the inner diameter of the image side of the sixth spacer, R12 is the radius of curvature of the image side of the sixth lens, and R13 is the radius of curvature of the object side of the seventh lens.
An optical imaging system according to an exemplary embodiment of the present application includes a lens barrel, a lens group disposed within the lens barrel, and a plurality of spacers. The lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an image side along the optical axis. The plurality of spacers includes a third spacer, a fourth spacer, and a sixth spacer. The third spacer is disposed on the image side of the third lens and is in contact with the image side portion of the third lens, the fourth spacer is disposed on the image side of the fourth lens and is in contact with the image side portion of the fourth lens, and the sixth spacer is disposed on the image side of the sixth lens and is in contact with the image side portion of the sixth lens. The thickness of the center of the fourth lens on the optical axis is the largest in the first lens to the seventh lens, and at least one lens of the third lens and the fourth lens has positive focal power. The effective focal length f4 of the fourth lens, the maximum thickness CP4 of the fourth spacer along the optical axis direction, the effective focal length f3 of the third lens, the maximum thickness CP3 of the third spacer along the optical axis direction, the inner diameter d6s of the object side surface of the sixth spacer, the inner diameter d6m of the image side surface of the sixth spacer, the radius of curvature R12 of the image side surface of the sixth lens and the radius of curvature R13 of the object side surface of the seventh lens satisfy that 8.5< |f4/CP4+CP3/f3| <30.0 and 5.0< (d6m+d6s)/(R12-R13) <9.0, the above conditions are satisfied, the lens is guaranteed to have good resolving power in a limited space, the thicknesses of the third spacer and the fourth spacer are restrained by thickening the center thickness of the fourth lens and the effective focal length of the third lens, the interval between the related lenses can be effectively adjusted, and simultaneously the sensitivity of the sixth lens and the inner diameter of the spacer on the inner diameter of the sixth lens and the object side surface of the sixth lens is effectively adjusted, the stability of the lens is guaranteed to be improved by the reliability of the lens group at the front end and the end of the lens is effectively improved, and the stability of the lens is guaranteed.
In an exemplary embodiment, the plurality of spacers of the optical imaging system further comprises a first spacer disposed on the image side of the first lens and in contact with the image side portion of the first lens, a second spacer disposed on the image side of the second lens and in contact with the image side portion of the second lens, and a fifth spacer disposed on the image side of the fifth lens and in contact with the image side portion of the fifth lens. The internal reflection stray light phenomenon of the first lens and the second lens is obvious, the rear end lens segment difference is large, the first isolating piece and the second isolating piece are reasonably arranged, the stray light can be effectively shielded, the influence on imaging is reduced, meanwhile, the assembly stability of the front lens and the rear lens can be effectively improved through the arrangement of the fifth isolating piece, and the lens is integrally guaranteed to have good resolution.
In an exemplary embodiment, the plurality of spacers of the optical imaging system may include at least one of a first spacer, a second spacer, a third spacer, a fourth spacer, a fifth spacer, and a sixth spacer. The first spacer is disposed on and at least partially contacts the image side of the first lens. The second spacer is disposed on and at least partially in contact with the image side of the second lens. The third spacer is disposed on the image side of the third lens and is at least partially in contact with the image side of the third lens. The fourth spacer is disposed on the image side of the fourth lens and is at least partially in contact with the image side of the fourth lens. The fifth spacer is disposed on the image side of the fifth lens and is at least partially in contact with the image side of the fifth lens. The sixth spacer is disposed on and at least partially in contact with the image side of the sixth lens. It should be understood that the present application is not particularly limited to the number of spacers, any number of spacers may be included between any two lenses, and that the entire optical imaging system may include any number of spacers. The spacer is helpful for the optical imaging system to intercept redundant refraction and reflection light paths and reduce the generation of stray light and ghost images. The auxiliary bearing is added between the isolating piece and the lens barrel, so that the problems of poor assembly stability, low performance yield and the like caused by large step difference between lenses are solved.
In an exemplary embodiment, the object side and the image side of the sixth lens are different in sign, the object side and the image side of the seventh lens are different in sign, and the optical imaging system according to the present application may satisfy-3.0 < (R11/R12+R13/R14) ×CP6<0, where R11 is the radius of curvature of the object side of the sixth lens, R12 is the radius of curvature of the image side of the sixth lens, R13 is the radius of curvature of the object side of the seventh lens, R14 is the radius of curvature of the image side of the seventh lens, and CP6 is the maximum thickness of the sixth spacer in the optical axis direction. Satisfying-3.0 < (R11/R12+R13/R14) ×CP6<0, by adjusting the front and rear curvature radius of the sixth lens and the seventh lens, light can be effectively made to smoothly pass through the optical imaging system to present better resolution, meanwhile, the maximum thickness of the sixth spacer can be restrained by the relational expression, the lens edge thickness of the sixth lens and the seventh lens can be effectively ensured, the front and rear curvature radius of the sixth lens and the seventh lens can be controlled in a combined way, lens molding can be ensured, and limit technology is avoided.
In an exemplary embodiment, the optical imaging system according to the present application may satisfy 1.5< EP34/CT3+cp4/T45<5.5, wherein EP34 is a distance from an image side surface of the third spacer to an object side surface of the fourth spacer in an optical axis direction, CT3 is a center thickness of the third lens on the optical axis, CP4 is a maximum thickness of the fourth spacer in the optical axis direction, and T45 is an air gap of the fourth lens and the fifth lens on the optical axis. Satisfying 1.5< EP34/CT3+CP4/T45<5.5, reasonably setting the center thickness of the third lens and the air interval between the fourth lens and the fifth lens on the optical axis, can promote the imaging quality of the optical imaging system in the limited lens length space, can restrict the distance from the image side surface of the third isolation piece to the object side surface of the fourth isolation piece along the optical axis direction and the maximum thickness of the fourth isolation piece along the optical axis direction through the relation, can effectively promote the structural stability of the position with larger section difference in the direction vertical to the optical axis, and reduce the variation in the reliability test such as high temperature, high humidity and the like.
In an exemplary embodiment, the optical imaging system according to the present application may satisfy 11.0< |f4/EP34| <21.0, where f4 is an effective focal length of the fourth lens and EP34 is a distance from an image side surface of the third spacer to an object side surface of the fourth spacer in the optical axis direction. The effective focal length of the fourth lens can be reasonably set to be 11.0< |f4/EP34| <21.0, the sensitivity of the system can be effectively reduced, and the assembly stability can be effectively improved by restraining the distance from the image side surface of the third isolation member to the object side surface of the fourth isolation member along the optical axis direction.
In an exemplary embodiment, the optical imaging system according to the present application may satisfy-40.5 < R8/CP4< -4.0, where R8 is a radius of curvature of an image side surface of the fourth lens and CP4 is a maximum thickness of the fourth spacer in an optical axis direction. Satisfies-40.5 < R8/CP4< -4.0, restricts the maximum thickness of the fourth isolation piece through the curvature radius of the image side surface of the fourth lens, ensures the molding stability of the effective diameter of the fourth lens, and simultaneously controls the stray light generated by the reflection of invalid light on the inner diameter surface of the fourth isolation piece, thereby ensuring the imaging quality.
In an exemplary embodiment, the optical imaging system according to the present application may satisfy CP4/CT4<1.0, where CP4 is the maximum thickness of the fourth spacer in the direction of the optical axis, and CT4 is the center thickness of the fourth lens on the optical axis. The structure strength of CP4/CT4 is ensured, and the maximum thickness of the fourth isolation piece is restrained by combining the center thickness of the fourth lens, so that the imaging influence of invalid light caused by stray light generated by the fourth isolation piece can be reduced.
In an exemplary embodiment, the optical imaging system according to the present application may satisfy 2.0< f 6/(EP 56+cp 6) <6.2, where f6 is an effective focal length of the sixth lens, EP56 is a separation distance of an image side surface of the fifth spacer to an object side surface of the sixth spacer in the optical axis direction, and CP6 is a maximum thickness of the sixth spacer in the optical axis direction. Satisfying 2.0< f 6/(EP 56+ CP 6) <6.2, the overall strength of the sixth lens can be controlled by adjusting the effective focal length of the sixth lens, and the distance from the image side surface of the fifth spacer to the object side surface of the sixth spacer in the optical axis direction and the maximum thickness of the sixth spacer can be constrained by the relationship, so that the stability of the assembly of the sixth lens and the seventh lens can be effectively ensured.
In an exemplary embodiment, the optical imaging system according to the present application may satisfy 0.5< D5s/R10+D5m/R11<6.5, where D5s is the outer diameter of the object side of the fifth spacer, D5m is the outer diameter of the image side of the fifth spacer, R10 is the radius of curvature of the image side of the fifth lens, and R11 is the radius of curvature of the object side of the sixth lens. Satisfying 0.5< D5 s/R10+D5mR11 <6.5, adjusting the radius of curvature of the image side surface of the fifth lens and the radius of curvature of the object side surface of the sixth lens can effectively converge light and reduce ghosting generated by internal reflection of the lenses, and by combining the relation, the outer diameter of the object side surface and the outer diameter of the image side surface of the fifth spacer are controlled, so that the intensity of the spacer is ensured and stray light generated by internal reflection of the fifth lens is shielded.
In an exemplary embodiment, the optical imaging system according to the present application may satisfy 9.5< f/tan (Semi-FOV) +d0m/d0s <12.5, where f is an effective focal length of the optical imaging system, semi-FOV is a maximum half field angle of the optical imaging system, D0m is an outer diameter of an image side end surface of the lens barrel, and D0s is an outer diameter of an object side end surface of the lens barrel. The requirements of 9.5< f/tan (Semi-FOV) +D0m/D0s <12.5 are met, the definition of imaging can be effectively ensured by controlling the effective focal length of the optical imaging system, the effective light can be ensured to enter and be blocked by combining the maximum half field angle of the optical imaging system and the outer diameter of the object side end face of the lens barrel, the outer diameter of the image side end face of the lens barrel is controlled, the reflection of the ineffective light on the inner wall of the image side of the lens barrel can be reduced, the stray light risk is reduced, and the imaging quality is improved.
In an exemplary embodiment, the optical imaging system according to the present application may satisfy 19.0< R4/R5+EP23/CP2<57.0, where R4 is a radius of curvature of an image side surface of the second lens, R5 is a radius of curvature of an object side surface of the third lens, EP23 is a distance from the image side surface of the second separator to the object side surface of the third separator in an optical axis direction, and CP2 is a maximum thickness of the second separator in the optical axis direction. Satisfying 19.0< R4/R5+EP23/CP2<57.0, the spacing distance from the image side surface of the second spacer to the object side surface of the third spacer along the optical axis direction can be adjusted, and meanwhile, the maximum thickness of the second spacer can be restrained, the intensity of the second spacer is ensured, and stray light caused by deformation of the spacer is reduced.
In an exemplary embodiment, the optical imaging system according to the present application may satisfy f/L×tan (Semi-FOV) <1.0, where f is an effective focal length of the optical imaging system, semi-FOV is a maximum half field angle of the optical imaging system, and L is a maximum height of the lens barrel in an optical axis direction. The f/L multiplied by tan (Semi-FOV) is satisfied and is less than 1.0, the definition of imaging can be effectively ensured by controlling the effective focal length of the optical imaging system, the maximum height of the lens barrel is restrained by combining the maximum half field angle of the optical imaging system, the telescopic usable length of the tele lens is ensured, and meanwhile, the structural strength is also ensured while the optical requirement length is also ensured.
In an exemplary embodiment, the optical imaging system according to the present application may satisfy 5.0< D1s/EP01+l/TD <9.5, where D1s is an outer diameter of the object side surface of the first spacer, EP01 is a distance from the object side end surface of the lens barrel to the object side surface of the first spacer in the optical axis direction, L is a maximum height of the lens barrel in the optical axis direction, and TD is a distance from the object side surface of the first lens to the image side surface of the seventh lens in the optical axis. The constraint of 5.0< D1s/EP01+L/TD <9.5 on the maximum height of the lens barrel can be met, the assembly stability can be ensured at the same time, the distance between the outer diameter of the object side surface of the first isolation piece and the distance between the object side end surface of the lens barrel and the object side surface of the first isolation piece along the optical axis direction can be adjusted through the relational expression, the front end thickness of the lens barrel can be effectively ensured, and the structural strength is optimized.
In an exemplary embodiment, the optical imaging system according to the present application may satisfy 3.5< TD/(EP 23+ep 34) <6.5, where TD is a distance on the optical axis from the object side surface of the first lens to the image side surface of the seventh lens, EP23 is a distance between the image side surface of the second spacer and the object side surface of the third spacer in the optical axis direction, and EP34 is a distance between the image side surface of the third spacer and the object side surface of the fourth spacer in the optical axis direction. The imaging quality is easily influenced by the internal stray light of the second lens and the third lens of the lens group, the requirement of 3.5< TD/(EP 23+EP 34) <6.5 is met, the distance from the object side surface of the first lens to the image side surface of the seventh lens on the optical axis is used for restraining the interval distance from the image side surface of the second isolation piece to the object side surface of the third isolation piece along the optical axis direction and the distance from the image side surface of the third isolation piece to the object side surface of the fourth isolation piece along the optical axis direction, and the internal stray light of the lenses can be effectively adjusted, so that the imaging quality is effectively improved.
In an exemplary embodiment, the first lens may have positive power, the second lens may have positive power or negative power, the third lens may have positive power or negative power, the fourth lens may have positive power or negative power, the fifth lens may have positive power or negative power, the sixth lens may have positive power, and the seventh lens may have negative power.
In an embodiment of the present application, at least one of the mirrors of each lens is an aspherical mirror, i.e., at least one of the object side surface of the first lens to the image side surface of the seventh lens is an aspherical mirror. The aspherical lens is characterized in that the curvature is continuously changed 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. Optionally, the object side surface and the image side surface of all the first lens to the seventh lens are aspherical mirror surfaces.
In an exemplary embodiment, the above optical imaging system may further include a filter for correcting color deviation and/or a protective glass for protecting a 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, the seven lenses above. Through reasonable distribution of focal power, surface shape, arrangement of the spacers and the like of each lens, each gear span of the lens and the lens barrel is uniform, the light converging capacity is enhanced, and the imaging quality of an ultrathin large-image-surface optical imaging system is improved. 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 seven lenses are described as an example in the embodiment, the optical imaging system is not limited to include seven 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 1001 and an optical imaging system 1002 according to embodiment 1 of the present application are described below with reference to fig. 2A to 3C. Fig. 2A and 2B show schematic structural diagrams of an optical imaging system 1001 and an optical imaging system 1002 according to embodiment 1 of the present application, respectively.
As shown in fig. 2A and 2B, the optical imaging system 1001 and the optical imaging system 1002 respectively include a lens barrel P0, lens groups E1 to E7, and a plurality of spacers P1 to P6.
As shown in fig. 2A and 2B, the optical imaging system 1001 and the optical imaging system 1002 employ the same lens group, which includes, in order from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. The first lens E1 has an object side surface S1 and an image side surface S2. The second lens E2 has an object side surface S3 and an image side surface S4. The third lens element E3 has an object side surface S5 and an image side surface S6. The fourth lens element E4 has an object side surface S7 and an image side surface S8. The fifth lens element E5 has an object side surface S9 and an image side surface S10. The sixth lens E6 has an object side surface S11 and an image side surface S12. The seventh lens E7 has an object side surface S13 and an image side surface S14. The filter (not shown) has an object side surface S15 (not shown) and an image side surface S16 (not shown), and light from an object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on an imaging surface S17 (not shown).
Table 1 shows basic parameter tables of lens groups of the optical imaging system 1001 and the optical imaging system 1002 of embodiment 1, in which the units of radius of curvature, thickness, and effective focal length are millimeters (mm).
TABLE 1
In this example, the effective focal lengths f of the optical imaging system 1001 and the optical imaging system 1002 are each 8.42mm, the maximum half field angles Semi-FOV of the optical imaging system 1001 and the optical imaging system 1002 are each 39.36 °, and the f-numbers Fno of the optical imaging system 1001 and the optical imaging system 1002 are each 1.88.
In embodiment 1, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical, and the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:
Where x is the distance vector height of the aspherical surface at a position h in the optical axis direction from the apex of the aspherical surface, c is the paraxial curvature of the aspherical surface, c=1/R (i.e., paraxial curvature c is the reciprocal of the radius of curvature R in table 1 above), k is a conic coefficient, and Ai is the correction coefficient of the i-th order of the aspherical surface. The higher order coefficients A4、A6、A8、A10、A12、A14、A16、A18、A20、A22、A24、A26、A28 and A 30 that can be used for each of the aspherical mirror faces S1-S14 in example 1 are given in tables 2-1 and 2-2.
TABLE 2-1
Face number A18 A20 A22 A24 A26 A28 A30
S1 -6.10E-05 -3.31E-05 1.08E-05 2.37E-05 1.33E-05 -1.40E-05 2.09E-06
S2 7.58E-05 -4.59E-05 6.41E-05 3.24E-05 5.31E-05 -1.07E-05 -1.43E-05
S3 -1.39E-06 -4.38E-05 8.94E-05 1.95E-07 4.53E-05 4.64E-06 5.49E-06
S4 -3.92E-04 -1.92E-04 -3.55E-05 3.54E-05 5.62E-05 3.26E-05 1.18E-05
S5 -9.81E-05 -7.20E-06 1.46E-05 1.13E-05 -1.71E-06 -5.58E-06 7.59E-07
S6 -3.36E-04 5.37E-05 1.46E-05 2.18E-05 -3.73E-06 2.91E-06 1.81E-06
S7 -7.17E-04 -9.62E-05 4.59E-05 2.66E-05 -2.77E-05 -3.90E-05 -2.32E-05
S8 -1.46E-04 1.25E-04 -1.75E-04 6.81E-06 -6.18E-05 -6.26E-06 -8.43E-06
S9 -4.79E-03 2.04E-03 -1.73E-03 9.94E-04 -7.27E-04 3.61E-04 -4.27E-04
S10 4.55E-04 1.09E-03 -8.78E-05 2.44E-05 -2.05E-04 1.00E-04 -1.46E-05
S11 7.59E-04 1.66E-03 1.60E-04 -3.82E-04 -1.71E-04 -2.57E-05 8.17E-05
S12 -4.21E-03 3.06E-03 -1.12E-03 2.21E-04 3.11E-04 -2.06E-04 1.12E-05
S13 -4.44E-03 -2.07E-03 2.35E-03 -7.96E-04 -2.61E-04 3.52E-04 -9.84E-05
S14 2.50E-03 -7.46E-04 -2.92E-04 -7.39E-04 4.13E-04 -6.32E-06 -1.68E-05
TABLE 2-2
As shown in fig. 2A and 2B, the optical imaging system 1001 and 1002 each include six spacers, wherein a first spacer P1 is disposed on and at least partially in contact with the image side of the first lens, a second spacer P2 is disposed on and at least partially in contact with the image side of the second lens, a third spacer P3 is disposed on and at least partially in contact with the image side of the third lens, a fourth spacer P4 is disposed on and at least partially in contact with the image side of the fourth lens, a fifth spacer P5 is disposed on and at least partially in contact with the image side of the fifth lens, and a sixth spacer P6 is disposed on and at least partially in contact with the image side of the sixth lens. The spacer can block the entry of external excessive light, so that the lens and the lens barrel can be better supported, and the structural stability of the optical imaging system 1001 and the optical imaging system 1002 can be enhanced.
Table 3 shows basic parameters of the optical imaging system 1001 and the spacer of the optical imaging system 1002 and the lens barrel of embodiment 1, and each parameter in table 3 has a unit of millimeter (mm).
TABLE 3 Table 3
Fig. 3A shows on-axis chromatic aberration curves of the optical imaging system 1001 and the optical imaging system 1002 of embodiment 1, which represent the convergent focus deviation of light rays of different wavelengths after passing through a lens. Fig. 3B shows distortion curves of the optical imaging system 1001 and the optical imaging system 1002 of embodiment 1, which represent distortion magnitude values corresponding to different image heights. Fig. 3C shows magnification chromatic aberration curves of the optical imaging system 1001 and the optical imaging system 1002 of embodiment 1, which represent deviations of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 3A to 3C, the optical imaging system 1001 and the optical imaging system 1002 according to embodiment 1 can achieve good imaging quality.
Example 2
An optical imaging system 2001 and an optical imaging system 2002 according to embodiment 2 of the present application are described below with reference to fig. 4A to 5C. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 4A and 4B show schematic structural diagrams of an optical imaging system 2001 and an optical imaging system 2002 according to embodiment 2 of the present application, respectively.
As shown in fig. 4A and 4B, the optical imaging system 2001 and the optical imaging system 2002 respectively include a lens barrel P0, lens groups E1 to E7, and a plurality of spacers P1 to P6.
As shown in fig. 4A and 4B, the optical imaging system 2001 and the optical imaging system 2002 employ the same lens group, which includes, in order from an object side to an image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. The first lens E1 has an object side surface S1 and an image side surface S2. The second lens E2 has an object side surface S3 and an image side surface S4. The third lens element E3 has an object side surface S5 and an image side surface S6. The fourth lens element E4 has an object side surface S7 and an image side surface S8. The fifth lens element E5 has an object side surface S9 and an image side surface S10. The sixth lens E6 has an object side surface S11 and an image side surface S12. The seventh lens E7 has an object side surface S13 and an image side surface S14. The filter (not shown) has an object side surface S15 (not shown) and an image side surface S16 (not shown), and light from an object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on an imaging surface S17 (not shown).
In this example, the effective focal lengths f of the optical imaging system 2001 and the optical imaging system 2002 are each 8.68mm, the maximum half field angles Semi-FOV of the optical imaging system 2001 and the optical imaging system 2002 are each 39.39 °, and the f-numbers Fno of the optical imaging system 2001 and the optical imaging system 2002 are each 1.88.
Table 4 shows basic parameter tables of the lens groups of the optical imaging system 2001 and the optical imaging system 2002 of embodiment 2, in which the units of the radius of curvature, the thickness, and the effective focal length are each millimeters (mm). Tables 5-1 and 5-2 show the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 2, wherein each of the aspherical surface profiles can be defined by the formula (1) given in example 1 above.
TABLE 4 Table 4
Face number A4 A6 A8 A10 A12 A14 A16
S1 5.59E-03 -6.00E-03 -3.37E-03 -1.51E-03 -5.62E-04 -2.01E-04 -8.40E-05
S2 -8.23E-02 3.28E-03 -3.95E-03 -4.34E-04 -3.64E-04 -2.13E-04 -2.42E-05
S3 -1.51E-01 4.08E-02 5.80E-04 4.98E-04 -4.36E-04 -1.58E-04 -9.29E-05
S4 -2.99E-01 4.54E-02 4.96E-03 3.10E-03 4.36E-04 6.49E-05 -9.19E-05
S5 -1.16E-01 -6.27E-03 7.82E-03 3.50E-03 7.59E-04 -1.01E-04 -4.02E-05
S6 -2.00E-01 -3.41E-03 2.50E-03 2.07E-03 4.84E-04 -8.71E-05 -5.65E-05
S7 -2.97E-01 -3.13E-04 1.90E-03 2.26E-03 1.48E-03 4.16E-04 4.03E-05
S8 -6.43E-01 5.89E-02 6.74E-04 9.48E-03 2.70E-03 1.68E-03 -1.22E-05
S9 -3.55E-01 -2.53E-01 7.92E-02 -3.75E-02 4.84E-02 -1.33E-02 5.66E-03
S10 -2.80E+00 4.02E-01 -1.12E-01 2.88E-02 -3.82E-03 7.12E-03 -1.02E-02
S11 -1.30E+00 -1.17E-01 -2.95E-03 7.83E-02 -2.67E-02 -9.33E-03 9.53E-03
S12 2.05E+00 -4.47E-01 4.38E-02 6.17E-02 -3.78E-02 4.27E-03 2.91E-02
S13 1.20E+00 5.15E-01 -3.48E-01 1.33E-01 2.69E-03 -1.29E-02 6.77E-03
S14 -6.23E+00 9.10E-01 -3.26E-01 9.09E-02 -3.33E-02 2.59E-02 1.52E-03
TABLE 5-1
TABLE 5-2
As shown in fig. 4A and 4B, the optical imaging system 2001 and the optical imaging system 2002 each include six spacers, wherein the first spacer P1 is disposed on and at least partially in contact with the image side of the first lens, the second spacer P2 is disposed on and at least partially in contact with the image side of the second lens, the third spacer P3 is disposed on and at least partially in contact with the image side of the third lens, the fourth spacer P4 is disposed on and at least partially in contact with the image side of the fourth lens, the fifth spacer P5 is disposed on and at least partially in contact with the image side of the fifth lens, and the sixth spacer P6 is disposed on and at least partially in contact with the image side of the sixth lens. The above-mentioned spacer can block the entry of external excessive light, make lens and lens barrel bear against better, and strengthen the structural stability of the optical imaging system 2001 and optical imaging system 2002.
Table 6 shows basic parameters of the spacers and the lens barrels of the optical imaging system 2001 and the optical imaging system 2002 of embodiment 2, and each parameter in table 6 has a unit of millimeter (mm).
TABLE 6
Fig. 5A shows on-axis chromatic aberration curves of the optical imaging system 2001 and the optical imaging system 2002 of embodiment 2, which represent the convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 5B shows distortion curves of the optical imaging system 2001 and the optical imaging system 2002 of embodiment 2, which represent distortion magnitude values corresponding to different image heights. Fig. 5C shows magnification chromatic aberration curves of the optical imaging system 2001 and the optical imaging system 2002 of embodiment 2, which represent deviations of different image heights on an imaging plane after light passes through a lens. As can be seen from fig. 5A to 5C, the optical imaging system 2001 and the optical imaging system 2002 according to embodiment 2 can achieve good imaging quality.
Example 3
An optical imaging system 3001 and an optical imaging system 3002 according to embodiment 3 of the present application are described below with reference to fig. 6A to 7C. Fig. 6A and 6B show schematic structural diagrams of an optical imaging system 3001 and an optical imaging system 3002 according to embodiment 3 of the present application, respectively.
As shown in fig. 6A and 6B, the optical imaging system 3001 and the optical imaging system 3002 respectively include a lens barrel P0, lens groups E1 to E7, and a plurality of spacers P1 to P6.
As shown in fig. 6A and 6B, the optical imaging system 3001 and the optical imaging system 3002 employ the same lens group, and the lens group includes, in order from an object side to an image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. The first lens E1 has an object side surface S1 and an image side surface S2. The second lens E2 has an object side surface S3 and an image side surface S4. The third lens element E3 has an object side surface S5 and an image side surface S6. The fourth lens element E4 has an object side surface S7 and an image side surface S8. The fifth lens element E5 has an object side surface S9 and an image side surface S10. The sixth lens E6 has an object side surface S11 and an image side surface S12. The seventh lens E7 has an object side surface S13 and an image side surface S14. The filter (not shown) has an object side surface S15 (not shown) and an image side surface S16 (not shown), and light from an object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on an imaging surface S17 (not shown).
In this example, the effective focal lengths f of the optical imaging systems 3001 and 3002 are each 7.79mm, the maximum half field angles Semi-FOV of the optical imaging systems 3001 and 3002 are each 36.00 °, and the f-numbers Fno of the optical imaging systems 3001 and 3002 are each 1.89.
Table 7 shows basic parameter tables of lens groups of the optical imaging system 3001 and the optical imaging system 3002 of example 3, in which the units of radius of curvature, thickness, and effective focal length are all millimeters (mm). Tables 8-1 and 8-2 show the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 3, wherein each of the aspherical surface profiles can be defined by the formula (1) given in example 1 above.
TABLE 7
Face number A4 A6 A8 A10 A12 A14 A16
S1 7.03E-03 4.49E-03 -3.81E-04 1.01E-04 -2.23E-04 -5.76E-05 -3.52E-05
S2 -1.93E-01 2.52E-02 -4.73E-03 1.07E-03 -7.56E-04 -3.38E-06 6.12E-05
S3 -2.41E-01 5.65E-02 -9.09E-03 6.67E-03 -3.84E-03 1.68E-03 -8.08E-04
S4 -1.97E-01 3.27E-02 1.76E-03 4.05E-03 -1.36E-03 6.00E-04 -2.38E-05
S5 -2.26E-01 1.61E-02 -3.10E-03 1.94E-03 -8.46E-04 2.99E-04 2.92E-05
S6 -1.70E-02 -2.04E-02 7.78E-03 -2.11E-03 8.72E-04 -1.35E-04 2.67E-04
S7 -2.02E-01 -1.05E-03 5.91E-05 2.94E-03 2.57E-04 5.33E-04 3.62E-05
S8 -4.05E-01 6.48E-03 -1.75E-03 3.73E-03 3.78E-04 7.67E-04 9.97E-05
S9 -8.12E-02 -1.57E-01 4.05E-02 -3.14E-02 1.33E-02 -7.49E-03 5.67E-03
S10 -2.22E+00 3.11E-01 -6.71E-02 1.91E-02 -1.31E-02 7.76E-03 -1.42E-03
S11 -1.04E+00 -1.84E-01 4.15E-02 2.70E-02 -3.57E-03 1.58E-03 -7.43E-04
S12 1.43E+00 -4.16E-01 1.49E-01 -1.64E-02 -4.22E-03 2.33E-03 -1.93E-03
S13 1.36E-01 5.09E-01 -1.83E-01 2.26E-02 1.04E-02 -6.41E-03 -2.04E-03
S14 -4.68E+00 8.79E-01 -2.65E-01 7.09E-02 -3.27E-02 1.23E-02 -6.15E-03
TABLE 8-1
TABLE 8-2
As shown in fig. 6A and 6B, the optical imaging system 3001 and the optical imaging system 3002 each include six spacers, wherein the first spacer P1 is disposed on and at least partially in contact with the image side of the first lens, the second spacer P2 is disposed on and at least partially in contact with the image side of the second lens, the third spacer P3 is disposed on and at least partially in contact with the image side of the third lens, the fourth spacer P4 is disposed on and at least partially in contact with the image side of the fourth lens, the fifth spacer P5 is disposed on and at least partially in contact with the image side of the fifth lens, and the sixth spacer P6 is disposed on and at least partially in contact with the image side of the sixth lens. The above-mentioned spacer can block the entry of external excessive light, make lens and lens barrel bear better, and strengthen the structural stability of optical imaging system 3001 and optical imaging system 3002.
Table 9 shows basic parameters of the spacers and the lens barrel of the optical imaging system 3001 and the optical imaging system 3002 of embodiment 3, and each parameter in table 9 is in millimeters (mm).
Parameter/optical imaging system Optical imaging system 3001 Optical imaging system 3002
D1s 6.842 7.195
D5s 11.293 10.945
D5m 11.293 10.945
d6s 7.890 7.789
d6m 7.890 7.789
D0s 8.598 11.273
D0m 13.200 12.476
EP01 1.098 1.296
CP2 0.018 0.024
EP23 0.783 0.735
CP3 0.018 0.016
EP34 1.180 1.213
CP4 1.285 1.203
EP56 1.215 1.164
CP6 0.018 0.033
L 8.708 8.956
TABLE 9
Fig. 7A shows on-axis chromatic aberration curves of the optical imaging system 3001 and the optical imaging system 3002 of embodiment 3, which represent convergent focus deviations of light rays of different wavelengths after passing through a lens. Fig. 7B shows distortion curves of the optical imaging system 3001 and the optical imaging system 3002 of embodiment 3, which represent distortion magnitude values corresponding to different image heights. Fig. 7C shows a chromatic aberration of magnification curve of the optical imaging system 3001 and the optical imaging system 3002 of embodiment 3, which represents a deviation of different image heights on an imaging plane after light passes through a lens. As can be seen from fig. 7A to 7C, the optical imaging system 3001 and the optical imaging system 3002 given in embodiment 3 can achieve good imaging quality.
Example 4
An optical imaging system 4001 and an optical imaging system 4002 according to embodiment 4 of the present application are described below with reference to fig. 8A to 9C. Fig. 8A and 8B show schematic structural diagrams of an optical imaging system 4001 and an optical imaging system 4002 according to embodiment 4 of the present application, respectively.
As shown in fig. 8A and 8B, the optical imaging system 4001 and the optical imaging system 4002 respectively include a lens barrel P0, lens groups E1 to E7, and a plurality of spacers P1 to P6.
As shown in fig. 8A and 8B, the optical imaging system 4001 and the optical imaging system 4002 employ the same lens group, and the lens group includes, in order from an object side to an image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. The first lens E1 has an object side surface S1 and an image side surface S2. The second lens E2 has an object side surface S3 and an image side surface S4. The third lens element E3 has an object side surface S5 and an image side surface S6. The fourth lens element E4 has an object side surface S7 and an image side surface S8. The fifth lens element E5 has an object side surface S9 and an image side surface S10. The sixth lens E6 has an object side surface S11 and an image side surface S12. The seventh lens E7 has an object side surface S13 and an image side surface S14. The filter (not shown) has an object side surface S15 (not shown) and an image side surface S16 (not shown), and light from an object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on an imaging surface S17 (not shown).
In this example, the effective focal lengths f of the optical imaging systems 4001 and 4002 are each 6.65mm, the maximum half field angles Semi-FOV of the optical imaging systems 4001 and 4002 are each 36.00 °, and the f-numbers Fno of the optical imaging systems 4001 and 4002 are each 1.89.
Table 10 shows basic parameter tables of lens groups of the optical imaging system 4001 and the optical imaging system 4002 of embodiment 4, in which the units of a radius of curvature, a thickness, and an effective focal length are all millimeters (mm). Tables 11-1 and 11-2 show the higher order coefficients that can be used for each aspherical mirror in example 4, where each aspherical surface profile can be defined by equation (1) given in example 1 above.
Table 10
Face number A4 A6 A8 A10 A12 A14 A16
S1 4.19E-02 2.68E-03 -1.20E-03 3.75E-04 -3.69E-04 9.96E-05 -1.30E-04
S2 -9.20E-02 1.35E-02 -4.62E-03 2.09E-03 -1.17E-03 -6.98E-04 7.22E-04
S3 -1.42E-01 5.26E-02 -2.20E-02 1.17E-02 -6.32E-03 2.11E-03 -6.46E-04
S4 -1.86E-01 4.80E-02 -2.02E-02 1.06E-02 -5.07E-03 2.02E-03 -4.86E-04
S5 -9.84E-02 -8.74E-03 1.84E-03 7.92E-04 -3.65E-04 -2.72E-05 2.51E-04
S6 -1.70E-02 -4.79E-03 4.43E-03 -2.72E-03 -3.20E-04 -6.97E-04 -1.30E-04
S7 -2.18E-01 -9.44E-03 -5.79E-03 -2.63E-03 -1.86E-03 -1.07E-03 -7.44E-04
S8 -2.04E-01 6.26E-04 1.98E-03 -1.05E-04 5.03E-04 2.09E-04 1.99E-04
S9 -3.65E-01 2.77E-02 2.06E-03 -9.53E-04 -8.19E-07 -1.00E-04 -1.07E-04
S10 -7.39E-01 4.25E-02 2.16E-03 -5.11E-04 2.57E-04 -1.38E-04 -6.61E-04
S11 -6.70E-01 -6.08E-02 2.57E-03 -2.76E-03 -5.92E-04 -3.63E-05 -1.42E-03
S12 7.42E-01 -1.76E-01 5.69E-02 -1.80E-02 3.35E-03 -1.55E-03 -9.06E-04
S13 -7.31E-01 1.36E-01 1.41E-02 -1.68E-02 7.34E-03 -3.44E-03 7.32E-04
S14 -3.90E+00 6.06E-01 -1.96E-01 5.40E-02 -1.65E-02 3.70E-03 -8.54E-04
TABLE 11-1
Face number A18 A20 A22 A24 A26 A28 A30
S1 4.41E-05 -1.96E-05 5.34E-05 -8.58E-06 2.34E-05 -1.91E-05 -1.54E-05
S2 -5.72E-04 4.51E-04 -1.76E-04 1.91E-04 -1.41E-04 1.11E-04 -1.07E-04
S3 2.86E-04 -4.75E-05 1.15E-04 -7.75E-05 1.07E-05 -3.91E-05 -8.65E-06
S4 2.33E-04 -8.10E-07 -7.05E-06 -4.54E-05 -2.75E-05 -7.78E-06 -6.20E-06
S5 -3.10E-05 1.01E-04 -5.09E-05 -3.16E-05 -2.44E-05 -1.32E-05 2.57E-06
S6 -2.25E-04 -6.38E-05 -8.67E-05 -2.49E-05 -2.39E-06 -9.97E-07 2.36E-06
S7 -4.41E-04 -2.78E-04 -1.84E-04 -1.20E-04 -5.65E-05 -3.48E-05 -1.16E-05
S8 1.63E-04 1.29E-04 5.57E-05 3.87E-05 2.03E-05 2.02E-05 -6.79E-07
S9 1.13E-04 8.38E-06 -4.47E-05 -2.81E-05 2.28E-06 1.93E-05 8.58E-06
S10 2.82E-04 1.38E-04 3.12E-05 -3.94E-05 -4.90E-06 9.11E-07 7.23E-07
S11 -3.07E-06 3.57E-04 2.34E-04 -4.11E-05 -3.33E-05 -1.73E-05 7.03E-06
S12 5.69E-05 7.39E-04 2.31E-04 -1.03E-04 -5.82E-05 -1.17E-05 -1.46E-06
S13 -8.22E-04 7.04E-04 -1.17E-04 -7.47E-05 2.95E-05 1.10E-06 -1.24E-06
S14 -5.02E-04 3.88E-04 -4.72E-04 4.08E-04 -1.80E-04 9.20E-05 -2.40E-05
TABLE 11-2
As shown in fig. 8A and 8B, the optical imaging system 4001 and the optical imaging system 4002 each comprise six spacers, wherein the first spacer P1 is disposed on and at least partially in contact with the image side of the first lens, the second spacer P2 is disposed on and at least partially in contact with the image side of the second lens, the third spacer P3 is disposed on and at least partially in contact with the image side of the third lens, the fourth spacer P4 is disposed on and at least partially in contact with the image side of the fourth lens, the fifth spacer P5 is disposed on and at least partially in contact with the image side of the fifth lens, and the sixth spacer P6 is disposed on and at least partially in contact with the image side of the sixth lens. The above-mentioned spacer can block the external superfluous light from entering, make lens and lens barrel bear against better, and strengthen the structural stability of optical imaging system 4001 and optical imaging system 4002.
Table 12 shows basic parameters of the spacers and the lens barrels of the optical imaging system 4001 and the optical imaging system 4002 of embodiment 4, and each parameter in table 12 has a unit of millimeter (mm).
Parameter/optical imaging system Optical imaging system 4001 Optical imaging system 4002
D1s 5.769 5.676
D5s 7.835 7.888
D5m 7.950 7.894
d6s 5.947 6.101
d6m 5.947 6.101
D0s 6.967 8.970
D0m 11.095 10.455
EP01 0.717 0.732
CP2 0.018 0.022
EP23 0.742 0.727
CP3 0.018 0.016
EP34 0.456 0.511
CP4 0.877 0.768
EP56 0.698 0.652
CP6 0.018 0.041
L 7.543 7.437
Table 12
Fig. 9A shows on-axis chromatic aberration curves of the optical imaging system 4001 and the optical imaging system 4002 of embodiment 4, which represent convergent focus deviations of light rays of different wavelengths after passing through a lens. Fig. 9B shows distortion curves of the optical imaging system 4001 and the optical imaging system 4002 of embodiment 4, which represent distortion magnitude values corresponding to different image heights. Fig. 9C shows a magnification chromatic aberration curve of the optical imaging system 4001 and the optical imaging system 4002 of embodiment 4, which represents deviation of different image heights on an imaging plane after light passes through a lens. As can be seen from fig. 9A to 9C, the optical imaging system 4001 and the optical imaging system 4002 given in embodiment 4 can achieve good imaging quality.
In summary, the optical imaging systems 1001, 1002, 2001, 2002, 3001, 3002, 4001, and 4002 of embodiment 1 to embodiment 4 satisfy the relationship shown in table 13.
TABLE 13
The application also provides an imaging 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 device such as a digital camera or an imaging module integrated on a mobile electronic device such as a cell phone. The imaging device 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 (12)

1. An optical imaging system is characterized by comprising a lens barrel, a lens group and a plurality of isolating pieces, wherein the lens group and the isolating pieces are arranged in the lens barrel,
The lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an image side along an optical axis, wherein the first lens has positive focal power, the object side is a convex surface, the image side is a concave surface, the object side of the second lens is a convex surface, the image side is a concave surface, the object side of the third lens is a convex surface, the image side of the fourth lens is a concave surface, the image side of the fifth lens is a concave surface, the sixth lens has positive focal power, the object side of the sixth lens is a convex surface, the image side of the seventh lens is a convex surface, the object side of the seventh lens is a concave surface, and the focal power of the second lens to the fifth lens is combined by positive and negative positive, negative positive and negative positive, and positive and negative positive;
The plurality of spacers includes:
A third spacer disposed on an image side of the third lens and in contact with an image side portion of the third lens;
A fourth spacer disposed on the image side of the fourth lens and in contact with the image side portion of the fourth lens, and
A sixth spacer disposed on an image side of the sixth lens and in contact with an image side portion of the sixth lens;
the center thickness of the fourth lens on the optical axis is the largest among the first lens to the seventh lens;
the number of lenses having optical power in the optical imaging system is seven;
The effective focal length f4 of the fourth lens, the maximum thickness CP4 of the fourth spacer along the optical axis direction, the effective focal length f3 of the third lens and the maximum thickness CP3 of the third spacer along the optical axis direction satisfy that 9.19 is less than or equal to |f4/CP4+CP3/f3 is less than or equal to 29.51, and
The inner diameter d6s of the object side surface of the sixth spacer, the inner diameter d6m of the image side surface of the sixth spacer, the curvature radius R12 of the image side surface of the sixth lens and the curvature radius R13 of the object side surface of the seventh lens satisfy that (d6m+d6s)/(R12-R13) is less than or equal to 5.38 and less than or equal to 8.58;
The radius of curvature R11 of the object side surface of the sixth lens, the radius of curvature R12 of the image side surface of the sixth lens, the radius of curvature R13 of the object side surface of the seventh lens, the radius of curvature R14 of the image side surface of the seventh lens and the maximum thickness CP6 of the sixth spacer along the optical axis direction satisfy that-2.11 mm is less than or equal to (R11/R12+R13/R14) multiplied by CP6 is less than or equal to-0.05 mm.
2. The optical imaging system according to claim 1, wherein a distance EP34 from an image side surface of the third spacer to an object side surface of the fourth spacer in the optical axis direction, a center thickness CT3 of the third lens in the optical axis direction, a maximum thickness CP4 of the fourth spacer in the optical axis direction, and an air interval T45 between the fourth lens and the fifth lens in the optical axis direction satisfy that EP34/CT3+CP4/T45 is 2.04≤EP 4/T45≤4.84.
3. The optical imaging system according to claim 1, wherein an effective focal length f4 of the fourth lens, a distance EP34 from an image side surface of the third spacer to an object side surface of the fourth spacer in the optical axis direction satisfies 11.75 +.f4/EP 34 +.20.52.
4. The optical imaging system of claim 1, wherein a radius of curvature R8 of an image side surface of the fourth lens and a maximum thickness CP4 of the fourth spacer in the optical axis direction satisfy-39.97≤R8/CP 4≤4.60.
5. The optical imaging system according to claim 1, wherein a maximum thickness CP4 of the fourth spacer in the optical axis direction and a center thickness CT4 of the fourth lens on the optical axis satisfy 0.63≤cp 4/CT 4≤0.81.
6. The optical imaging system of any of claims 1-5, wherein the plurality of spacers further comprises a fifth spacer disposed on an image side of the fifth lens and in contact with an image side portion of the fifth lens, wherein,
The effective focal length f6 of the sixth lens, the spacing distance EP56 from the image side surface of the fifth separator to the object side surface of the sixth separator along the optical axis direction and the maximum thickness CP6 of the sixth separator along the optical axis direction meet that f 6/(EP 56+CP6) is less than or equal to 2.71 and less than or equal to 5.91.
7. The optical imaging system of any of claims 1-5, wherein the plurality of spacers further comprises a fifth spacer disposed on an image side of the fifth lens and in contact with an image side portion of the fifth lens, wherein,
The outer diameter D5s of the object side surface of the fifth spacer, the outer diameter D5m of the image side surface of the fifth spacer, the curvature radius R10 of the image side surface of the fifth lens and the curvature radius R11 of the object side surface of the sixth lens are 0.77-6.21 and D5 s/R10+D5m/R11.
8. The optical imaging system according to any one of claims 1 to 5, wherein an effective focal length f of the optical imaging system, a maximum half field angle Semi-FOV of the optical imaging system, an outer diameter D0m of an image side end surface of the lens barrel, and an outer diameter D0s of an object side end surface of the lens barrel satisfy 10.31≤f/tan (Semi-FOV) +d0m/d0s≤12.26.
9. The optical imaging system of any of claims 1-5, wherein the plurality of spacers further comprises a second spacer disposed on an image side of the second lens and in contact with an image side portion of the second lens, wherein,
The radius of curvature R4 of the image side surface of the second lens, the radius of curvature R5 of the object side surface of the third lens, the spacing distance EP23 from the image side surface of the second spacer to the object side surface of the third spacer along the optical axis direction and the maximum thickness CP2 of the second spacer along the optical axis direction meet that R4/R5+EP23/CP2 is not less than 19.36 and not more than 56.75.
10. The optical imaging system according to any one of claims 1 to 5, wherein an effective focal length f of the optical imaging system, a maximum half field angle Semi-FOV of the optical imaging system, and a maximum height L of the lens barrel in the optical axis direction satisfy 0.63+.f/L x tan (Semi-FOV) +.0.84.
11. The optical imaging system of any of claims 1-5, wherein the plurality of spacers further comprises a first spacer disposed on the image side of the first lens and in contact with the image side portion of the first lens, wherein,
The outer diameter D1s of the object side surface of the first isolation piece, the distance EP01 from the object side end surface of the lens barrel to the object side surface of the first isolation piece along the optical axis direction, the maximum height L of the lens barrel along the optical axis direction and the distance TD from the object side surface of the first lens to the image side surface of the seventh lens on the optical axis meet that D1s/EP01+L/TD is more than or equal to 5.68 and less than or equal to 9.07.
12. The optical imaging system of any of claims 1-5, wherein the plurality of spacers further comprises a second spacer disposed on an image side of the second lens and in contact with an image side portion of the second lens, wherein,
The distance TD between the object side surface of the first lens and the image side surface of the seventh lens on the optical axis, the interval distance EP23 between the image side surface of the second separator and the object side surface of the third separator along the optical axis direction and the interval distance EP34 between the image side surface of the third separator and the object side surface of the fourth separator along the optical axis direction are all 4.18-6.14, and the ratio of TD/(EP 23+EP 34) is not more than 4.18.
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