CN114815165A - Imaging lens system - Google Patents
Imaging lens system Download PDFInfo
- Publication number
- CN114815165A CN114815165A CN202210563608.XA CN202210563608A CN114815165A CN 114815165 A CN114815165 A CN 114815165A CN 202210563608 A CN202210563608 A CN 202210563608A CN 114815165 A CN114815165 A CN 114815165A
- Authority
- CN
- China
- Prior art keywords
- lens
- imaging
- refractive index
- lens system
- imaging lens
- 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.)
- Pending
Links
- 238000003384 imaging method Methods 0.000 title claims abstract description 156
- 239000000463 material Substances 0.000 claims description 21
- 230000003287 optical effect Effects 0.000 description 23
- 230000014509 gene expression Effects 0.000 description 10
- 210000000887 face Anatomy 0.000 description 7
- 238000002834 transmittance Methods 0.000 description 7
- 239000006059 cover glass Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 235000012149 noodles Nutrition 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 210000001747 pupil Anatomy 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—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
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, which are arranged in this order from an object side. The third lens has 2.2-3.5 [10 ] ‑6 /℃]Temperature coefficient of refractive index of, and 0<f34*0.8<f, where f is the focal length of the imaging lens system, and f34 is the combined focal length of the third and fourth lenses.
Description
Cross Reference to Related Applications
This application claims the benefit of priority of korean patent application No. 10-2021-0103230, filed on 8/5/2021 to the korean intellectual property office, the entire disclosure of which is incorporated herein by reference for all purposes.
Technical Field
The following description relates to an imaging lens system for achieving constant optical performance regardless of changes in the temperature of the surrounding environment.
Background
Since early small monitoring cameras were configured to image obstacles near the vehicle, such cameras had not only a relatively low resolution, but also a wide range of resolutions that varied according to temperature changes of-40 ℃ to 80 ℃. However, due to the increasing demand for the automatic driving function of the vehicle, it is required to develop a monitoring camera having high resolution even under severe temperature conditions and capable of realizing certain optical characteristics.
Disclosure of Invention
This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
In one general aspect, an imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, which are arranged in this order from an object side. The third lens has a size of 2.2 × 10 -6 From/° C to 3.5X 10 -6 Temperature coefficient of refractive index of 0/deg.C<f34*0.8<f, where f is the focal length of the imaging lens system, and f34 is the combined focal length of the third and fourth lenses.
The first lens, the second lens, and the third lens may be formed of a material different from that of the fourth lens, the fifth lens, the sixth lens, and the seventh lens.
The imaging lens system may satisfy 35< V2/Nd2<45, where V2 is an abbe number of the second lens, and Nd2 is a refractive index of the second lens.
The imaging lens system may satisfy 20< V3/Nd3<30, where V3 is an abbe number of the third lens, and Nd3 is a refractive index of the third lens.
The imaging lens system may satisfy 10< V5/Nd5<20, where V5 is an abbe number of the fifth lens, and Nd5 is a refractive index of the fifth lens.
The imaging lens system may satisfy 30< V6/Nd6<40, where V6 is an abbe number of the sixth lens, and Nd6 is a refractive index of the sixth lens.
The imaging lens system may satisfy 27< Vmin13/Ndmin13<37, where Vmin13 is the minimum value among the abbe number of the first lens, the abbe number of the second lens, and the abbe number of the third lens, and Ndmin13 is the minimum value among the refractive index of the first lens, the refractive index of the second lens, and the refractive index of the third lens.
The imaging lens system may satisfy 30< Vmax47/Ndmax47<35, where Vmax47 is a maximum value of an abbe number of the fourth lens, an abbe number of the fifth lens, an abbe number of the sixth lens, and an abbe number of the seventh lens, and Ndmax47 is a maximum value of a refractive index of the fourth lens, a refractive index of the fifth lens, a refractive index of the sixth lens, and a refractive index of the seventh lens.
The imaging lens system may satisfy 0.4< f/f3<0.9, where f3 is a focal length of the third lens.
In another general aspect, an imaging lens system includes: a first lens having a negative refractive power; a second lens having a concave object side; a third lens having a convex object side; a fourth lens having a positive refractive power; a fifth lens having a concave object side; a sixth lens having a convex object side; and a seventh lens having a negative refractive power. The imaging lens system satisfies 0< f34 x 0.8< f, where f is a focal length of the imaging lens system, and f34 is a combined focal length of the third lens and the fourth lens.
The first lens may have a convex object side.
The first lens may have a size of 2.5 × 10 -6 From/° C to 4.5X 10 -6 Temperature coefficient of refractive index/° c.
The second lens may have a 1.0 × 10 -6 From/° C to 2.5X 10 -6 Temperature coefficient of refractive index/° c.
The fourth lens may have a-110 x 10 -6 From/° C to-80X 10 -6 Temperature coefficient of refractive index/° c.
The fifth lens may have a concave image side surface.
The imaging lens system may satisfy 1.1< Nd3/Nd4<1.2, where Nd3 is a refractive index of the third lens, and Nd4 is a refractive index of the fourth lens.
Other features and aspects will become apparent from the following detailed description, the appended claims, the drawings, and the following drawings.
Drawings
Fig. 1 is a block diagram of an imaging lens system according to a first embodiment of the present disclosure;
FIG. 2 is an MTF curve of the imaging lens system shown in FIG. 1;
FIG. 3 is a graph illustrating Back Focal Length (BFL) according to temperature change of the imaging lens system shown in FIG. 1;
fig. 4 is a block diagram of an imaging lens system according to a second embodiment of the present disclosure;
FIG. 5 is an MTF curve for the imaging lens system shown in FIG. 4;
FIG. 6 is a graph illustrating BFL according to temperature change of the imaging lens system shown in FIG. 4;
fig. 7 is a block diagram of an imaging lens system according to a third embodiment of the present disclosure;
FIG. 8 is an MTF curve for the imaging lens system shown in FIG. 7; and
fig. 9 is a graph showing BTF according to a temperature change of the imaging lens system shown in fig. 7.
Like reference numerals refer to like elements throughout the drawings and detailed description. The figures may not be drawn to scale and the relative sizes, proportions and depictions of the elements in the figures may be exaggerated for clarity, illustration and convenience.
Detailed Description
The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, apparatuses, and/or systems described herein. Various changes, modifications, and equivalents of the methods, devices, and/or systems described herein will, however, be apparent to those of ordinary skill in the art. The order of operations described herein is merely an example and, other than the operations that must occur in a particular order, is not limited to the order set forth herein, but may be varied, as will be apparent to those of ordinary skill in the art. In addition, descriptions of functions and constructions well known to those of ordinary skill in the art may be omitted for clarity and conciseness.
The features described herein may be embodied in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein have been provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It should be noted that use of the phrase "may" in relation to an example or embodiment herein (e.g., with respect to what the example or embodiment may comprise or implement) means that there is at least one example or embodiment in which such features are comprised or implemented, and all examples and embodiments are not limited thereto.
Throughout the specification, when an element such as a layer, region or substrate is described as being "on," "connected to" or "coupled to" another element, it can be directly on, "connected to" or "coupled to" the other element or one or more other elements may be present between the element and the other element. In contrast, when an element is referred to as being "directly on," "directly connected to" or "directly coupled to" another element, there are no other elements intervening between the element and the other element.
As used herein, the term "and/or" includes any one of the associated listed items as well as any combination of any two or more of the items.
Although terms such as "first", "second", and "third" may be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections are not limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first member, first component, first region, first layer, or first portion referred to in these examples may also be referred to as a second member, second component, second region, second layer, or second portion without departing from the teachings of the examples described herein.
Spatially relative terms such as "above … …," "upper," "below … …," and "lower" may be used herein for descriptive convenience to describe one element's relationship to another element as illustrated in the figures. These spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "upper" relative to other elements would then be oriented "below" or "lower" relative to the other elements. Thus, the term "above … …" encompasses both orientations of "above and" below. The device may also be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative terms used herein should be interpreted accordingly.
The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. The articles "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" specify the presence of stated features, integers, operations, elements, and/or groups thereof, but do not preclude the presence or addition of one or more other features, integers, operations, elements, components, and/or groups thereof.
Variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, may be expected. Thus, examples described herein are not limited to the specific shapes shown in the drawings, but include changes in shape that occur during manufacturing.
The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. Further, while the examples described herein have a variety of configurations, other configurations are possible as will be apparent after understanding the disclosure of this application.
The imaging lens system includes a plurality of lenses disposed along an optical axis. The plurality of lenses may be spaced apart from each other by a predetermined distance along the optical axis.
For example, the imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens that are disposed in this order from the object side of the imaging lens system toward the imaging plane of the imaging lens system along the optical axis, wherein the first lens is closest to the object side of the imaging lens system, and the seventh lens is closest to the imaging plane.
In each lens, the object side surface or the first surface is a surface of the lens closest to the object side of the imaging lens system, and the image side surface or the second surface is a surface of the lens closest to the imaging surface.
Unless otherwise specified, the shape of a lens surface refers to the shape of the paraxial region of the lens surface. The paraxial region of the lens surface, in which light rays incident on the lens surface form a small angle θ with the optical axis, is the central portion of the lens surface around and including the optical axis of the lens surface, and approximations of sin θ ≈ θ, tan θ ≈ θ, and cos θ ≈ 1 are effective.
For example, the expression that the object side of the lens is convex means that at least the paraxial region of the object side of the lens is convex, and the expression that the image side of the lens is concave means that at least the paraxial region of the image side of the lens is concave. Thus, even though the object side surface of the lens may be described as convex, the entire object side surface of the lens may not be convex, and the peripheral region of the object side surface of the lens may be concave. Further, even though the image side surface of the lens may be described as concave, the entire image side surface of the lens may not be concave, and the peripheral region of the image side surface of the lens may be convex.
At least one of the first lens to the seventh lens of the imaging lens system may have at least one aspherical surface.
The imaging lens system may include other elements in addition to the first to seventh lenses.
The imaging lens system may further include at least one stop disposed before the first lens, or between any two adjacent lenses of the first to seventh lenses, or between the seventh lens and the imaging surface. The imaging lens system may include two or more diaphragms disposed at different positions.
The imaging lens system may further include an image sensor having an imaging surface disposed at an imaging plane of the imaging lens system. The image sensor converts an image of an object formed on an effective imaging area of an imaging surface by a lens of the imaging lens system into an electric signal.
The imaging lens system may further include an infrared blocking filter for blocking infrared light, hereinafter referred to as a filter. The filter may be disposed between the seventh lens and the imaging surface.
The imaging lens system may further include at least one reflection member having a reflection surface that changes a direction of an optical path in the imaging lens system. For example, the reflecting member may be a prism or a mirror.
For example, the reflection member may be disposed in the optical path on the object side of the first lens, between any two lenses among the second lens to the seventh lens, or on the image side of the seventh lens.
For example, the imaging lens system may further include a first reflecting member disposed in the optical path between the object side of the imaging lens system and the object side surface of the first lens. Accordingly, the first lens may be a lens disposed closest to the first reflective member among the first to seventh lenses.
Further, the imaging lens system may further include a second reflecting member disposed in the optical path between the image side surface of the seventh lens and the imaging surface. Therefore, the seventh lens may be a lens disposed closest to the second reflective member among the first to seventh lenses.
TTL is the distance from the object side surface of the first lens to the imaging surface along the optical axis.
SL is a distance from the stop of the imaging lens system to the imaging plane along the optical axis.
BFL is a distance from an image-side surface of the seventh lens to the imaging surface along the optical axis.
PTTL is a distance from the reflection surface of the first reflection member to the imaging plane along the optical axis.
ImgH is the maximum effective image height of the imaging lens system and is equal to half the diagonal length of the effective imaging area of the imaging surface of the image sensor.
f is a focal length of the imaging lens system, and f1, f2, f3, f4, f5, f6, and f7 are focal lengths of the first lens to the seventh lens, respectively.
The FOV is the angle of view of the imaging lens system.
Fno is the f-number of the imaging lens system and is equal to the focal length f of the imaging lens system divided by the entrance pupil diameter of the imaging lens system.
DTn is the temperature coefficient of refractive index of the lens of the imaging lens system.
The effective half aperture of the lens surface is the radius of the portion of the lens surface through which light actually passes, and not necessarily the radius of the outer edge of the lens surface. In other words, the effective half aperture of the lens surface is the distance between the optical axis and the marginal ray of light passing through the lens surface in a direction perpendicular to the optical axis of the lens surface. The object-side surface of the lens and the image-side surface of the lens may have different effective half apertures.
The radius of curvature of the lens surface, the thickness of the lens and other elements, the distance between adjacent ones of the lens and other elements, the focal length f of the imaging lens system, the respective focal lengths f1, f2, f3, f4, f5, f6 and f7 of the first to seventh lenses, TTL, SL, BFL, PTTL and ImgH are expressed in millimeters (mm), although other units of measurement may be used. The FOV is expressed in degrees. Fno, refractive index of the lens, and abbe number of the lens are dimensionless quantities.
The thicknesses of the lens and other elements, the distance between adjacent two of the lens and other elements, TTL, SL, BFL, and PTTL are measured along the optical axis of the imaging lens system.
The imaging lens system according to various examples includes a plurality of lenses. For example, the imaging lens system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in this order from the object side.
The imaging lens system may include a lens having a predetermined temperature coefficient of refractive index. For example, the third lens may have a size of 2.2 × 10 -6 From/° C to 3.5X 10 -6 Temperature coefficient of refractive index/° c. The imaging lens system may be configured to satisfy a predetermined conditional expression. For example, the imaging lens system may satisfy the conditional expression: 0<f34*0.8<f. In the conditional expression, f is a focal length of the imaging lens system, and f34 is a combined focal length of the third lens and the fourth lens. An imaging lens system according to an example includes a plurality of lenses. For example, the imaging lens system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, which are arranged in this order from the object side. The imaging lens system may include a lens having a predetermined refractive power. For example, the first lens and the seventh lens may have negative refractive power, and the fourth lens may have positive refractive power. Further, the imaging lens system according to the present embodiment may include a lens having a predetermined shape. For example, the object side surface of the second lens and the object side surface of the fifth lens may be concave. As another example, the object side surface of the third lens and the object side surface of the sixth lens may be convex. Further, in the imaging lens system, the conditional expression may be satisfied: 0<f34*0.8<f。
The imaging lens system according to an example may be configured as a combination of the imaging lens system according to one example and the imaging lens system according to another example. As an example, the imaging lens system may be configured to include some features of the imaging lens system according to one example and some features of the imaging lens system according to another example.
As an example, the imaging lens system includes first to seventh lenses arranged in order from the object side, and may include a first lens having a negative refractive power and a second lens having a refractive power of 2.2 × 10 -6 From/° C to 3.5X 10 -6 A temperature coefficient of refractive index of/° c.
As another example, the imaging lens system includes first to seventh lenses arranged in order from the object side, and may include a second lens having a concave object side surface and a second lens having a 2.2 × 10 surface -6 From/° C to 3.5X 10 -6 A temperature coefficient of refractive index of/° c.
If desired, the imaging lens system may include one or more lenses having the following characteristics. As an example, the imaging lens system may include one or more of the first to seventh lenses having the following features. As another example, the imaging lens system may include two or more of the first to seventh lenses having the following features. However, the configuration of the imaging lens system is not limited thereto.
Hereinafter, characteristics of the first to seventh lenses will be described.
The first lens has a refractive power. One face of the first lens may be convex. For example, the first lens has a convex object side. The first lens includes a spherical surface or an aspherical surface. For example, the two faces of the first lens may be spherical. The first lens may be formed of a material having high light transmittance and excellent workability. For example, the first lens may be formed of a glass material. The first lens has a predetermined refractive index. For example, the refractive index of the first lens may be 1.75 or more.
The second lens has a refractive power. One face of the second lens may be convex. For example, the second lens may have a convex image side. The second lens includes a spherical surface. For example, both faces of the second lens may be spherical. The second lens may be formed of a material having high light transmittance and excellent workability. For example, the second lens may be formed of a glass material. The second lens has a predetermined refractive index. For example, the refractive index of the second lens may be less than 1.53.
The third lens has a refractive power. One face of the third lens may be convex. For example, the third lens may have a convex image side. The third lens includes a spherical surface. For example, both faces of the third lens may be spherical. The third lens may be formed of a material having high light transmittance and excellent workability. For example, the third lens may be formed of a glass material. The third lens has a refractive index greater than the refractive index of the first lens and the refractive index of the second lens. For example, the refractive index of the third lens may be 1.78 or more.
The fourth lens has a refractive power. One face of the fourth lens may be convex. For example, the fourth lens may have a convex object side. The fourth lens includes an aspherical surface. For example, both faces of the fourth lens may be aspherical. The fourth lens may be formed of a material having high light transmittance and excellent workability. For example, the fourth lens may be formed of a plastic material. The fourth lens has a predetermined refractive index. For example, the refractive index of the fourth lens may be less than 1.56.
The fifth lens has refractive power. One face of the fifth lens may be concave. For example, the fifth lens may have a concave image side surface. The fifth lens includes an aspherical surface. For example, both faces of the fifth lens may be aspherical. The fifth lens may be formed of a material having high light transmittance and excellent workability. For example, the fifth lens may be formed of a plastic material. The fifth lens has a predetermined refractive index. For example, the refractive index of the fifth lens may be 1.6 or more.
The sixth lens has refractive power. One face of the sixth lens may be convex. For example, the sixth lens may have a convex image side surface. The sixth lens includes an aspherical surface. For example, both faces of the sixth lens may be aspherical. The sixth lens may be formed of a material having high light transmittance and excellent workability. For example, the sixth lens may be formed of a plastic material. The sixth lens has a refractive index substantially similar to that of the fourth lens. For example, the refractive index of the sixth lens may be less than 1.56.
The seventh lens has a refractive power. One face of the seventh lens may be concave. For example, the seventh lens may have a concave image side surface. The seventh lens includes an aspherical surface. For example, both faces of the seventh lens may be aspherical. The seventh lens may be formed of a material having high light transmittance and excellent workability. For example, the seventh lens may be formed of a plastic material. The seventh lens has a refractive index substantially similar to that of the sixth lens. For example, the refractive index of the seventh lens may be less than 1.56.
The aspherical lens constituting the imaging lens system may be represented by the following equation 1.
Equation 1:
in equation 1, c is the inverse of the radius of curvature of the lens, k is a conic constant, r is the distance from an arbitrary point on the aspherical surface to the optical axis, A, B, C, D, E, F, F, G is an aspherical constant, and Z (or SAG) is the height from an arbitrary point on the aspherical surface to the vertex of the aspherical surface in the optical axis direction.
The imaging lens system may comprise lenses of different materials. For example, the first to third lenses may be formed of a material different from that of the fourth to seventh lenses. As a specific example, the first to third lenses may be formed of a glass material having a small thermal expansion coefficient due to external impact and temperature change, and the fourth to seventh lenses may be formed of a plastic material that is easy to process.
The imaging lens system may include a lens having a predetermined temperature coefficient of refractive index. As an example, the imaging lens system may include a lens having a size of 2.5 × 10 -6 From/° C to 4.5X 10 -6 A temperature coefficient of refractive index/° c. As another example, the imaging lens system may include a lens having a size of 1.0 × 10 -6 From/° C to 2.5X 10 -6 A temperature coefficient of refractive index/° c. As another example, the imaging lens system may include a lens having a size of-110 x 10 -6 From/° C to-80X 10 -6 A temperature coefficient of refractive index/° c.
The imaging lens system includes a diaphragm, an imaging surface, and a filter. Further, the imaging lens system may further include a cover glass.
As an example, a diaphragm may be disposed between the third lens and the fourth lens. As another example, the stop may be provided on the image side of the lens having a positive refractive power, or may be provided between the lens having a positive refractive power and the lens having a positive refractive power. The imaging plane may be formed at a point where the light refracted by the first to seventh lenses forms an image. The imaging plane may be formed by an image sensor. For example, the imaging plane may be formed on the surface of the image sensor or inside the image sensor. The filter may be disposed between the seventh lens and the imaging surface. The filter may block some wavelengths of light. For example, the filter may block infrared wavelengths of light. The cover glass may be disposed between the optical filter and the imaging plane.
The imaging lens system may satisfy one or more of the following conditional expressions:
20<V1/Nd1<30
35<V2/Nd2<45
20<V3/Nd3<30
30<V4/Nd4<40
10<V5/Nd5<20
30<V6/Nd6<40
30<V7/Nd7<40
27<Vmin13/Ndmin13<37
30<Vmax47/Ndmax47<35
0.4<f/f3<0.9
1.1<Nd3/Nd4<1.2
in the conditional expressions, V1 is an abbe number of the first lens, Nd1 is a refractive index of the first lens, V2 is an abbe number of the second lens, Nd2 is a refractive index of the second lens, V3 is an abbe number of the third lens, Nd3 is a refractive index of the third lens, V4 is an abbe number of the fourth lens, Nd4 is a refractive index of the fourth lens, V5 is an abbe number of the fifth lens, Nd5 is a refractive index of the fifth lens, and V6 is an abbe number of the sixth lens, Nd6 is a refractive index of the sixth lens, V7 is an abbe number of the seventh lens, Nd7 is a refractive index of the seventh lens, and Vmin13 is a minimum value among the abbe numbers of the first to third lenses, Ndmin13 is a minimum value among the refractive indices of the first to third lenses, vm 47 is a maximum value among the abbe numbers of the fourth to seventh lenses, and Vmin is a maximum value of the focal length f of the fourth to seventh lenses, and vmmax is a maximum value of the imaging system 47, and f3 is the focal length of the third lens.
Hereinafter, examples will be described in detail based on the attached exemplary drawings.
First, an imaging lens system according to a first example will be described with reference to fig. 1.
The imaging lens system 100 includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, and a seventh lens 170.
The first lens 110 has a negative refractive power, and has a convex object-side surface and a concave image-side surface. The second lens 120 has a negative refractive power, and has a concave object-side surface and a convex image-side surface. The third lens 130 has a positive refractive power, and has a convex object-side surface and a convex image-side surface. The fourth lens 140 has positive refractive power, and has a convex object-side surface and a convex image-side surface. The fifth lens 150 has a negative refractive power, and has a concave object-side surface and a concave image-side surface. The sixth lens 160 has positive refractive power, and has a convex object-side surface and a convex image-side surface. The seventh lens 170 has a negative refractive power, and has a convex object-side surface and a concave image-side surface.
The imaging lens system 100 may further include a stop ST, a filter IF, and an imaging plane IP. The stop ST may be disposed between the third lens 130 and the fourth lens 140. An imaging plane IP may be formed in the image sensor IS, and a filter IF may be disposed between the seventh lens 170 and the imaging plane IP. Further, the cover glass may be integrally formed with the image sensor IS.
Fig. 2 and 3 show MTF characteristics of the imaging lens system 100 and a variation amount of the back focal length (Δ BFL: μm) according to temperature.
Table 1 and table 2 show lens characteristics and aspherical values of the imaging lens system 100.
TABLE 1
TABLE 2
| Noodle numbering | K | A | B | C | D |
| S8 | 7.0642.E-02 | -2.4369.E-03 | -4.6737.E-04 | -1.1169.E-05 | -2.0495.E-05 |
| S9 | -7.5150.E+00 | 1.1083.E-02 | -7.2883.E-03 | 1.1135.E-03 | -6.7702.E-05 |
| S10 | -2.0400.E+01 | -1.4445.E-02 | 2.2319.E-03 | -5.9120.E-05 | -5.2918.E-06 |
| S11 | 8.3447.E-01 | -2.2231.E-02 | -3.4868.E-04 | 1.0260.E-03 | -1.7444.E-04 |
| S12 | 2.6520.E+00 | 2.0724.E-02 | -8.9739.E-03 | 1.8565.E-03 | -1.4093.E-04 |
| S13 | 2.7857.E+00 | 1.6853.E-02 | -1.2500.E-03 | -4.0621.E-05 | 4.9122.E-05 |
| S14 | 1.8210.E+01 | -2.6214.E-02 | 1.0575.E-03 | -2.8050.E-04 | 3.7860.E-05 |
| S15 | -2.6076.E+01 | -2.0768.E-02 | 1.7587.E-03 | -1.6205.E-04 | 9.8983.E-06 |
An imaging lens system according to a second example will be described with reference to fig. 4.
The imaging lens system 200 includes a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, a sixth lens 260, and a seventh lens 270.
The first lens 210 has a negative refractive power, and has a convex object-side surface and a concave image-side surface. The second lens 220 has a negative refractive power, and has a concave object-side surface and a convex image-side surface. The third lens 230 has a positive refractive power, and has a convex object-side surface and a convex image-side surface. The fourth lens 240 has a positive refractive power, and has a convex object-side surface and a convex image-side surface. The fifth lens 250 has a negative refractive power, and has a concave object-side surface and a concave image-side surface. The sixth lens 260 has positive refractive power, and has a convex object-side surface and a convex image-side surface. The seventh lens 270 has negative refractive power, and has a convex object-side surface and a concave image-side surface.
The imaging lens system 200 may further include a stop ST, a filter IF, and an imaging plane IP. The stop ST may be disposed between the third lens 230 and the fourth lens 240. An imaging plane IP may be formed in the image sensor IS, and a filter IF may be disposed between the seventh lens 270 and the imaging plane IP. In addition, the cover glass may be integrally formed with the image sensor IS.
Fig. 5 and 6 show MTF characteristics of the imaging lens system 200 and a variation amount of the back focal length (Δ BFL: μm) according to temperature.
Tables 3 and 4 show lens characteristics and aspherical values of the imaging lens system 200.
TABLE 3
TABLE 4
| Noodle numbering | K | A | B | C | D |
| S8 | 6.1743.E-02 | -2.4007.E-03 | -2.9765.E-04 | -2.4390.E-05 | -1.9528.E-05 |
| S9 | -9.8752.E+00 | 1.1954.E-02 | -7.3793.E-03 | 1.1236.E-03 | -7.0377.E-05 |
| S10 | -3.3385.E+01 | -1.2211.E-02 | -2.6904.E-04 | 5.8774.E-04 | -6.0860.E-05 |
| S11 | 5.5242.E-01 | -1.8889.E-02 | -2.9707.E-03 | 1.5675.E-03 | -1.9462.E-04 |
| S12 | 2.3570.E+01 | 3.2261.E-02 | -1.2069.E-02 | 2.2846.E-03 | -1.6979.E-04 |
| S13 | 2.7339.E+00 | 2.2043.E-02 | -3.3001.E-03 | 5.6630.E-04 | -2.6083.E-05 |
| S14 | 1.3661.E+01 | -9.6564.E-03 | -2.4299.E-03 | 5.9171.E-04 | -5.3941.E-05 |
| S15 | 1.3526.E+01 | -1.4778.E-02 | 1.2140.E-04 | 1.2956.E-04 | -1.9478.E-05 |
An imaging lens system according to a third example will be described with reference to fig. 7.
The imaging lens system 300 includes a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, a fifth lens 350, a sixth lens 360, and a seventh lens 370.
The first lens 310 has a negative refractive power, and has a convex object-side surface and a concave image-side surface. The second lens 320 has a negative refractive power, and has a concave object-side surface and a convex image-side surface. The third lens 330 has positive refractive power, and has a convex object-side surface and a convex image-side surface. The fourth lens 340 has a positive refractive power, and has a convex object-side surface and a convex image-side surface. The fifth lens 350 has a negative refractive power, and has a concave object-side surface and a concave image-side surface. The sixth lens 360 has positive refractive power, and has a convex object-side surface and a convex image-side surface. The seventh lens 370 has negative refractive power, and has a convex object-side surface and a concave image-side surface.
The imaging lens system 300 may further include a stop ST, a filter IF, and an imaging plane IP. The stop ST may be disposed between the third lens 330 and the fourth lens 340. An imaging plane IP may be formed in the image sensor IS, and a filter IF may be disposed between the seventh lens 370 and the imaging plane IP. Further, the cover glass may be integrally formed with the image sensor IS.
Fig. 8 and 9 show MTF characteristics of the imaging lens system 300 and a variation amount of the back focal length (Δ BFL: μm) according to temperature.
Table 5 and table 6 show lens characteristics and aspherical values of the imaging lens system 300.
TABLE 5
TABLE 6
| Noodle numbering | K | A | B | C | D |
| S8 | -4.7672.E+01 | -1.8479.E-04 | -1.2522.E-03 | 5.7369.E-05 | -9.2322.E-06 |
| S9 | -1.1896.E+01 | -6.2097.E-03 | -1.7162.E-03 | 3.8513.E-04 | -3.3577.E-05 |
| S10 | 7.6939.E+01 | -2.4136.E-02 | 7.2951.E-03 | -9.5074.E-04 | 5.0715.E-05 |
| S11 | -4.2089.E-01 | -2.8224.E-02 | 4.9170.E-03 | -1.4101.E-04 | -3.8423.E-05 |
| S12 | 1.0819.E+01 | 1.4042.E-02 | -7.2970.E-03 | 1.4972.E-03 | -1.0629.E-04 |
| S13 | -8.4400.E+00 | -5.7902.E-04 | -1.0970.E-03 | 9.4651.E-05 | 1.8619.E-05 |
| S14 | 5.5617.E+00 | 5.3117.E-04 | -8.0796.E-03 | 1.6457.E-03 | -1.1181.E-04 |
| S15 | 2.1566.E+00 | -1.6959.E-02 | -2.7458.E-03 | 7.7632.E-04 | -6.0830.E-05 |
Table 7 shows optical characteristic values of the imaging lens systems according to the first to third examples, and table 8 shows conditional expression values of the imaging lens systems according to the first to third examples.
TABLE 7
| Reference to | First example | Second example | Third example |
| TTL | 19.000 | 18.989 | 19.001 |
| BFL | 3.100 | 3.100 | 3.100 |
| f | 3.325 | 3.320 | 3.278 |
| f1 | -6.240 | -6.318 | -5.691 |
| f2 | -18.412 | -16.640 | -37.013 |
| f3 | 5.947 | 5.973 | 5.997 |
| f4 | 5.115 | 4.616 | 7.104 |
| f5 | -3.345 | -3.304 | -4.180 |
| f6 | 5.873 | 7.147 | 4.764 |
| f7 | -39.005 | -203.622 | -14.831 |
TABLE 8
| Conditional expressions | First example | Second example | Third example |
| V1/Nd1 | 27.9865 | 27.9865 | 27.9865 |
| V2/Nd2 | 42.3006 | 42.3006 | 42.3006 |
| V3/Nd3 | 25.7761 | 25.7761 | 25.7761 |
| V4/Nd4 | 36.3879 | 36.3879 | 36.3879 |
| V5/Nd5 | 14.3502 | 14.3502 | 14.3502 |
| V6/Nd6 | 36.3879 | 36.3879 | 36.3879 |
| V7/Nd7 | 36.3879 | 36.3879 | 14.0261 |
| Vmin13/Ndmin13 | 30.6526 | 30.6526 | 30.6526 |
| Vmax47/Ndmax47 | 34.0977 | 34.0977 | 34.0956 |
| f/f3 | 0.5591 | 0.5559 | 0.5466 |
| f34*0.8 | 2.3249 | 2.2075 | 2.7262 |
| Nd3/Nd4 | 1.1741 | 1.1741 | 1.1741 |
As described above, according to various examples, an imaging lens system capable of achieving constant optical characteristics even in a high-temperature or low-temperature environment can be provided.
While the present disclosure includes specific examples, it will be apparent to those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be considered in a descriptive sense only and not for purposes of limitation. The description of features or aspects in each example should be considered applicable to similar features or aspects in other examples. Suitable results may still be achieved if the described techniques are performed in a different order and/or if components in the described systems, architectures, devices, or circuits are combined in a different manner and/or replaced or supplemented by other components or their equivalents. Therefore, the scope of the present disclosure is defined not by the specific embodiments but by the claims and their equivalents, and all modifications within the scope of the claims and their equivalents should be understood as being included in the present disclosure.
Claims (16)
1. An imaging lens system comprising:
a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in order from an object side, wherein at least one of the first lens to the seventh lens has at least one aspherical surface,
wherein the third lens has a size of 2.2 × 10 -6 From/° C to 3.5X 10 -6 Temperature coefficient of refractive index,/° c, and
wherein,
0<f34*0.8<f，
wherein f is a focal length of the imaging lens system, and f34 is a combined focal length of the third lens and the fourth lens.
2. The imaging lens system according to claim 1, wherein the first lens, the second lens, and the third lens are formed of a material different from a material of the fourth lens, the fifth lens, the sixth lens, and the seventh lens.
3. The imaging lens system according to claim 1,
35<V2/Nd2<45，
wherein V2 is an abbe number of the second lens, and Nd2 is a refractive index of the second lens.
4. The imaging lens system according to claim 1,
20<V3/Nd3<30，
wherein V3 is an abbe number of the third lens, and Nd3 is a refractive index of the third lens.
5. The imaging lens system according to claim 1,
10<V5/Nd5<20，
wherein V5 is an abbe number of the fifth lens, and Nd5 is a refractive index of the fifth lens.
6. The imaging lens system according to claim 1,
30<V6/Nd6<40，
wherein V6 is an abbe number of the sixth lens, and Nd6 is a refractive index of the sixth lens.
7. The imaging lens system of claim 1,
27<Vmin13/Ndmin13<37，
wherein Vmin13 is the minimum value among the abbe number of the first lens, the abbe number of the second lens and the abbe number of the third lens, and Ndmin13 is the minimum value among the refractive index of the first lens, the refractive index of the second lens and the refractive index of the third lens.
8. The imaging lens system according to claim 1,
30<Vmax47/Ndmax47<35,
wherein Vmax47 is a maximum value of an abbe number of the fourth lens, an abbe number of the fifth lens, an abbe number of the sixth lens, and an abbe number of the seventh lens, and Ndmax47 is a maximum value of a refractive index of the fourth lens, a refractive index of the fifth lens, a refractive index of the sixth lens, and a refractive index of the seventh lens.
9. The imaging lens system according to claim 1,
0.4<f/f3<0.9，
wherein f3 is the focal length of the third lens.
10. An imaging lens system comprising:
a first lens having a negative refractive power;
a second lens having a concave object side surface;
a third lens having a convex object side;
a fourth lens having positive refractive power;
a fifth lens having a concave object side surface;
a sixth lens having a convex object-side surface; and
a seventh lens having a negative refractive power,
wherein at least one of the first lens to the seventh lens has at least one aspherical surface, an
Wherein,
0<f34*0.8<f，
wherein f is a focal length of the imaging lens system, and f34 is a combined focal length of the third lens and the fourth lens.
11. The imaging lens system of claim 10, wherein the first lens comprises a convex object side.
12. The imaging lens system of claim 10, wherein the first lens has a 2.5 x 10 -6 From/° C to 4.5X 10 -6 Temperature coefficient of refractive index/° c.
13. The imaging lens system of claim 10, wherein the second lens has a 1.0 x 10 -6 /° C to 2.5X 10 -6 Temperature coefficient of refractive index/° c.
14. The imaging lens system of claim 10, wherein the fourth lens has a-110 x 10 -6 From/° C to-80X 10 -6 Temperature coefficient of refractive index/° c.
15. The imaging lens system of claim 10, wherein the fifth lens comprises a concave image side surface.
16. The imaging lens system of claim 10,
1.1<Nd3/Nd4<1.2，
wherein Nd3 is a refractive index of the third lens, and Nd4 is a refractive index of the fourth lens.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020210103230A KR20230021399A (en) | 2021-08-05 | 2021-08-05 | Imaging Lens System |
| KR10-2021-0103230 | 2021-08-05 | ||
| CN202210536127.XA CN115704950A (en) | 2021-08-05 | 2022-05-17 | Imaging lens system |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210536127.XA Division CN115704950A (en) | 2021-08-05 | 2022-05-17 | Imaging lens system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114815165A true CN114815165A (en) | 2022-07-29 |
Family
ID=82549986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210563608.XA Pending CN114815165A (en) | 2021-08-05 | 2022-05-17 | Imaging lens system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114815165A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115480369A (en) * | 2022-08-22 | 2022-12-16 | 舜宇光学(中山)有限公司 | Large-aperture lens |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107065141A (en) * | 2017-05-18 | 2017-08-18 | 浙江舜宇光学有限公司 | Imaging lens |
| US20190187442A1 (en) * | 2016-07-13 | 2019-06-20 | Zhejiang Sunny Optics Co., Ltd. | Seven-piece wide-angle camera lens |
| US20210072509A1 (en) * | 2019-09-09 | 2021-03-11 | Samsung Electro-Mechanics Co., Ltd. | Imaging lens system |
| CN112882207A (en) * | 2021-04-29 | 2021-06-01 | 江西联益光学有限公司 | Optical imaging lens and imaging apparatus |
-
2022
- 2022-05-17 CN CN202210563608.XA patent/CN114815165A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20190187442A1 (en) * | 2016-07-13 | 2019-06-20 | Zhejiang Sunny Optics Co., Ltd. | Seven-piece wide-angle camera lens |
| CN107065141A (en) * | 2017-05-18 | 2017-08-18 | 浙江舜宇光学有限公司 | Imaging lens |
| US20210072509A1 (en) * | 2019-09-09 | 2021-03-11 | Samsung Electro-Mechanics Co., Ltd. | Imaging lens system |
| CN112558270A (en) * | 2019-09-09 | 2021-03-26 | 三星电机株式会社 | Imaging lens system |
| CN112882207A (en) * | 2021-04-29 | 2021-06-01 | 江西联益光学有限公司 | Optical imaging lens and imaging apparatus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115480369A (en) * | 2022-08-22 | 2022-12-16 | 舜宇光学(中山)有限公司 | Large-aperture lens |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113835194B (en) | Optical imaging system | |
| CN110716291B (en) | Optical imaging system | |
| CN112130284B (en) | Optical imaging system | |
| CN214097943U (en) | Optical imaging system and portable electronic device | |
| CN214895984U (en) | Optical imaging system | |
| CN110794554B (en) | Optical imaging system | |
| CN114545602A (en) | Optical imaging system | |
| CN110967809B (en) | Optical imaging system and camera module | |
| CN114815165A (en) | Imaging lens system | |
| TWI807937B (en) | Optical imaging system | |
| CN217506249U (en) | Imaging lens system | |
| CN115586620A (en) | Imaging lens system | |
| TW202430920A (en) | Imaging lens system | |
| CN220961982U (en) | Optical imaging system | |
| CN221686709U (en) | Optical imaging system and electronic apparatus | |
| CN117572603A (en) | Optical imaging system and electronic apparatus | |
| CN117170067A (en) | Optical imaging system |
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 |