CN116931221A - Imaging lens - Google Patents

Imaging lens Download PDF

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Publication number
CN116931221A
CN116931221A CN202210379226.1A CN202210379226A CN116931221A CN 116931221 A CN116931221 A CN 116931221A CN 202210379226 A CN202210379226 A CN 202210379226A CN 116931221 A CN116931221 A CN 116931221A
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CN
China
Prior art keywords
lens
lens group
imaging
refractive power
axis
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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
Application number
CN202210379226.1A
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Chinese (zh)
Inventor
张锡龄
陈柏言
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.)
Sintai Optical Shenzhen Co Ltd
Asia Optical Co Inc
Original Assignee
Sintai Optical Shenzhen Co Ltd
Asia Optical Co Inc
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.)
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Publication date
Priority claimed from TW110112155A external-priority patent/TWI774306B/en
Priority claimed from TW110120775A external-priority patent/TWI780750B/en
Priority claimed from US17/711,071 external-priority patent/US12124016B2/en
Application filed by Sintai Optical Shenzhen Co Ltd, Asia Optical Co Inc filed Critical Sintai Optical Shenzhen Co Ltd
Publication of CN116931221A publication Critical patent/CN116931221A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
    • 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

The present invention relates to an imaging lens comprising, in order from an object side to an image side along an optical axis: a first lens having a negative refractive power; a second lens having a positive refractive power; a third lens having a negative refractive power; a fourth lens having a negative refractive power; a fifth lens having a positive refractive power; a sixth lens having a positive refractive power; a seventh lens having a negative refractive power; and an eighth lens having a negative refractive power; the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element, the seventh lens element and the eighth lens element are arranged in order from the object side to the image side along an optical axis; the imaging lens at least meets one of the following conditions: -0.1< f2/f7< -5; -0.1< f2/f8< -5; where f2 is the focal length of the second lens, f7 is the focal length of the seventh lens, and f8 is the focal length of the eighth lens.

Description

Imaging lens
Technical Field
The invention relates to an imaging lens.
Background
The total length of the optical zoom lens of the conventional architecture is longer, and as the zoom magnification is higher, the total length of the lens is longer, so that light and thin image capturing devices such as smart phones, tablets, mobile devices and the like are required nowadays, and the optical zoom lens of the conventional architecture cannot be assembled at all. Meanwhile, a light and thin image pickup device is also required to realize a large aperture. Therefore, an imaging lens with another new architecture is needed to meet the requirements of the smart phone on the optical zoom function, while simultaneously meeting the requirements of miniaturization, larger aperture and the optical zoom function.
Disclosure of Invention
The invention aims to solve the technical problem that the lens in the prior art cannot simultaneously meet the requirements of miniaturization and optical zooming function, and provides an imaging lens which can simultaneously meet the requirements of miniaturization and optical zooming function.
The technical scheme adopted for solving the technical problems is as follows: an imaging lens is constructed, comprising:
a first lens group having a negative refractive power;
a second lens group having a positive refractive power;
a third lens group having a positive refractive power;
a fourth lens group having a positive refractive power;
wherein, the light from an object passes through the first lens group, the second lens group, the third lens group and the fourth lens group to the image side in sequence along the optical axis from the object side;
wherein the spacing of the lens groups can be changed so as to enable the imaging lens to zoom from a wide-angle end to a telescopic end;
the imaging lens at least meets one of the following conditions:
-0.1<f2/f7<-5；
-0.1<f2/f8<-5；
the imaging lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged from the object side to the image side along the optical axis, f2 is the focal length of the second lens, f7 is the focal length of the seventh lens, and f8 is the focal length of the eighth lens. When the imaging lens of the invention meets the above characteristics and conditions, the basic functions of the imaging lens of the invention can be achieved without other additional characteristics or conditions.
According to the imaging lens of the invention, the first lens group comprises a first lens, and the second lens group comprises a second lens and a third lens; the third lens group comprises a fourth lens and a fifth lens; the fourth lens group comprises a sixth lens, a seventh lens and an eighth lens; the first lens has a negative refractive power, the second lens has a positive refractive power, the third lens has a negative refractive power, the fourth lens has a negative refractive power, the fifth lens has a positive refractive power, the sixth lens has a positive refractive power, the seventh lens has a negative refractive power, and the eighth lens has a negative refractive power.
According to the imaging lens of the invention, the object side surface of the second lens is a convex surface, and the image side surface is a convex surface; the third lens element has a convex object-side surface and a concave image-side surface.
According to the imaging lens of the present invention, an object side surface of the fourth lens element is convex, and an image side surface is concave; the fifth lens element has a convex object-side surface and a convex image-side surface.
According to the imaging lens of the present invention, the sixth lens element is a meniscus lens element, and has a concave object-side surface and a convex image-side surface; the seventh lens is a meniscus lens, the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface; the image side surface of the eighth lens is concave.
According to the imaging lens of the invention, the first lens is a meniscus lens, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the object side surface of the eighth lens is concave or convex.
According to the imaging lens of the present invention, the imaging lens satisfies any one of the following conditions:
0.04<R22/R52<25；
-25<R42/R62<-0.04；
wherein R22 is the radius of curvature of the image side of the second lens; r52 is the radius of curvature of the image side of the fifth lens; r42 is the radius of curvature of the image side of the fourth lens; r62 is the radius of curvature of the image side of the sixth lens.
According to the imaging lens of the present invention, the imaging lens satisfies at least one of the following conditions:
0.1<DG12W/TTL<0.5；
0.1<DG34W/TTL<0.5；
0<DG23W/Dmax<1；
3.8<TTL/Dmax<5.2；
wherein DG12W is the distance between the first lens group and the second lens group along the axis at the wide-angle end, DG23W is the distance between the second lens group and the third lens group along the axis at the wide-angle end, DG34W is the distance between the third lens group and the fourth lens group along the axis at the wide-angle end, TTL is the distance between the object side surface of the lens closest to the object side and the imaging surface on the axis, dmax is the maximum optical effective diameter of all the lenses of the imaging lens.
According to the imaging lens of the present invention, the second lens group moves toward the object side along the axis, the third lens group moves toward the image side along the axis, and the first lens group and the fourth lens group are fixed so as to make the imaging lens zoom from a wide-angle end to a telescopic end.
According to the imaging lens of the present invention, the imaging lens satisfies at least one of the following conditions:
0.1<(DG12W-DG12T)/(fT-fW)<1；
0.1<(DG23T-DG23W)/(fT-fW)<1；
0.1<(DG34W-DG34T)/(fT-fW)<1；
wherein fW is an effective focal length of the imaging lens at the wide-angle end, fT is an effective focal length of the imaging lens at the telephoto end, DG12W is a pitch of the first lens group and the second lens group along the axis at the wide-angle end, DG12T is a pitch of the first lens group and the second lens group along the axis at the telephoto end, DG23W is a pitch of the second lens group and the third lens group along the axis at the wide-angle end, DG23T is a pitch of the second lens group and the third lens group along the axis at the telephoto end, DG34W is a pitch of the third lens group and the fourth lens group along the axis at the wide-angle end, DG34T is a pitch of the third lens group and the fourth lens group along the axis at the telephoto end.
The imaging lens provided by the invention has the following beneficial effects: can simultaneously meet the miniaturization and has the optical zoom function.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1A is a schematic view of a lens configuration of a first embodiment of an imaging lens according to the present invention at a wide-angle end;
fig. 1B is a schematic view of a lens configuration of a first embodiment of an imaging lens according to the present invention at a telephoto end;
fig. 2A is a field curvature diagram of an imaging lens at the wide-angle end according to a first embodiment of the present invention;
fig. 2B is a distortion diagram of the first embodiment of the imaging lens according to the present invention at the wide-angle end;
fig. 2C is a modulation transfer function diagram of the first embodiment of the imaging lens according to the present invention at the wide-angle end;
fig. 3A is a field curvature diagram of an imaging lens at a telephoto end according to a first embodiment of the present invention;
fig. 3B is a distortion diagram of the first embodiment of the imaging lens according to the present invention at the telephoto end;
fig. 3C is a modulation transfer function diagram of the first embodiment of the imaging lens according to the present invention at the telephoto end;
fig. 4A is a schematic view of a lens configuration of a second embodiment of an imaging lens according to the present invention at a wide-angle end;
fig. 4B is a schematic view of a lens configuration of a second embodiment of an imaging lens according to the present invention at a telephoto end.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The present invention provides an imaging lens including: a first lens group having a refractive power; a second lens group having a positive refractive power; a third lens group having a positive refractive power; and a fourth lens group having a positive refractive power; the light from an object sequentially passes through the first lens group, the second lens group, the third lens group and the fourth lens group to the image side along the axis from the object side; wherein the spacing of the lens groups can be changed to enable the imaging lens to change the focal length.
The present invention provides an imaging lens including: a first lens group having a negative refractive power; a second lens group having a positive refractive power; a third lens group having a positive refractive power; a fourth lens group having a positive refractive power; wherein, the light from an object passes through the first lens group, the second lens group, the third lens group and the fourth lens group to the image side in sequence along the optical axis from the object side; wherein the spacing of the lens groups can be changed so as to enable the imaging lens to zoom from a wide-angle end to a telescopic end; the imaging lens at least meets one of the following conditions: -0.1< f2/f7< -5; -0.1< f2/f8< -5; the imaging lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged from the object side to the image side along the optical axis, f2 is the focal length of the second lens, f7 is the focal length of the seventh lens, and f8 is the focal length of the eighth lens.
Please refer to the following table one, table two, table four and table five, wherein table one and table four are the relevant parameter tables of the lenses of the first embodiment and the second embodiment of the imaging lens according to the present invention, respectively, and table two and table five are the relevant parameter tables of the aspherical surfaces of the aspherical lenses of table one and table four, respectively.
Fig. 1A and 4A are schematic lens configurations at a wide angle end of a first embodiment and a second embodiment of an imaging lens of the present invention, respectively, and fig. 1B and 4B are schematic lens configurations at a telephoto end of the first embodiment and the second embodiment of the imaging lens of the present invention, respectively. The first lens group LG11, LG21 has a negative refractive power and includes first lenses L11, L21, the second lens group LG12, LG22 has a positive refractive power and includes second lenses L12, L22 and third lenses L13, L23, the third lens group LG13, LG23 has a positive refractive power and includes fourth lenses L14, L24 and fifth lenses L15, L25, and the fourth lens group LG14, LG24 has a positive refractive power and includes sixth lenses L16, L26, seventh lenses L17, L27 and eighth lenses L18, L28. The imaging lens further includes first aperture stops ST91, ST101, respectively.
The first lenses L11 and L21 are meniscus lenses with negative refractive power, and are made of glass material, the object side surfaces S15 and S25 are convex surfaces, the image side surfaces S16 and S26 are concave surfaces, and the object side surfaces S15 and S25 and the image side surfaces S16 and S26 are aspheric surfaces. The second lenses L12 and L22 are biconvex lenses having positive refractive power, and are made of glass material, the object side surfaces S17 and S27 are convex surfaces, the image side surfaces S18 and S28 are convex surfaces, and the object side surfaces S17 and S27 and the image side surfaces S18 and S28 are aspheric surfaces. The third lenses L13 and L23 are meniscus lenses with negative refractive power, and are made of glass material, the object side surfaces S19 and S29 are convex surfaces, the image side surfaces S110 and S210 are concave surfaces, and the object side surfaces S19 and S29 and the image side surfaces S110 and S210 are aspheric surfaces. The fourth lenses L14 and L24 are meniscus lenses with negative refractive power, and are made of plastic material, the object side surfaces S111 and S211 are convex surfaces, the image side surfaces S112 and S212 are concave surfaces, and the object side surfaces S111 and S211 and the image side surfaces S112 and S212 are aspheric surfaces. The fifth lenses L15 and L25 are biconvex lenses having positive refractive power, and are made of plastic material, wherein the object side surfaces S113 and S213 are convex surfaces, the image side surfaces S114 and S214 are convex surfaces, and the object side surfaces S113, S213 and S313 and the image side surfaces S114, S214 and S314 are aspheric surfaces. The sixth lenses L16 and L26 are meniscus lenses with positive refractive power, and are made of plastic material, the object-side surfaces S115 and S215 are concave, the image-side surfaces S116 and S216 are convex, and the object-side surfaces S115 and S215 and the image-side surfaces S116 and S216 are aspheric. The seventh lenses L17 and L27 have negative refractive power, and are made of plastic material, the object-side surfaces S117 and S217 are concave, the image-side surfaces S118 and S218 are convex, and the object-side surfaces S117 and S217 and the image-side surfaces S118 and S218 are aspheric. The eighth lenses L18, L28 have negative refractive power, and are made of plastic material, and the image sides S120, S220 are concave, and the object sides S119, S219 and the image sides S120, S220 are aspheric.
In addition, the imaging lenses 1, 2 satisfy at least one of the following conditions (1) to (11):
-5<f2/f7<-0.1；(1)
-5<f2/f8<-0.1；(2)
0.04<R22/R52<25；(3)
-25<R42/R62<-0.04；(4)
0.1<DG12W/TTL<0.5；(5)
0.1<DG34W/TTL<0.5；(6)
0<DG23W/Dmax<1；(7)
3.8<TTL/Dmax<5.2；(8)
0.1<(DG12W-DG12T)/(fT-fW)<1；(9)
0.1<(DG23T-DG23W)/(fT-fW)<1；(10)
0.1<(DG34W-DG34T)/(fT-fW)<1；(11)
wherein fW is an effective focal length of the imaging lenses 1, 2 at the wide-angle end, fT is an effective focal length of the imaging lenses 1, 2 at the telephoto end, f2 is a focal length of the second lenses L12, L22, f7 is a focal length of the seventh lenses L17, L27, f8 is a focal length of the eighth lenses L18, L28, and R22 is a radius of curvature of an image side surface of the second lenses L12, L22; r52 is the radius of curvature of the image side surface of the fifth lenses L15, L25; r42 is the radius of curvature of the image side surfaces of the fourth lenses L14, L24; r62 is the radius of curvature of the image side surface of the sixth lenses L16, L26; DG12W is the pitch along the axes OA1 and OA2 of the first lens groups LG11, LG21 and the second lens groups LG12 and LG22 at the wide-angle end, DG12T is the pitch along the axes OA1 and OA2 of the first lens groups LG11, LG21 and the second lens groups LG22 at the telephoto end, DG23W is the pitch along the axes OA1 and OA2 of the second lens groups LG12, LG22 and the third lens groups LG13 and LG23 at the wide-angle end, DG23T is the pitch along the axes OA1 and OA2 of the second lens groups LG12, LG22 and the third lens groups LG13, LG23 at the telephoto end, DG34W is the pitch along the axes OA1 and OA2 of the third lens groups LG13, LG23 and the fourth lens groups LG14, LG24 at the telephoto end, DG34T is the pitch along the most effective side surfaces of the axes OA1 and OA2 of the lens groups LG14 and LG24 at the telephoto end, and DG34T is the most effective side surfaces of the lens groups LG1 and LG2 at the most effective sides.
When any one of the above conditional expressions (1) to (4) is satisfied, the imaging lens of the present invention can maintain good optical performance in each focal segment of zooming, effectively distribute the system refractive power, and further reduce the system sensitivity.
When any one of the above conditional expressions (5) to (7) is satisfied, the imaging lens is enabled to effectively shorten the total length of the lens, effectively shorten the thickness of the lens, effectively improve the resolution, effectively correct the aberration, effectively correct the chromatic aberration, and realize the optical zoom function.
When any one of the above conditional expressions (8) to (11) is satisfied, the imaging lens is enabled to appropriately improve the focusing problem at the telephoto end and the wide-angle end near-photographing, while having characteristics of miniaturization and low power, correcting aberrations such as image bending generated during focusing, and balancing aberrations generated during zooming, and reducing back focus variation.
A first embodiment of the imaging lens of the present invention will now be described in detail. Referring to fig. 1A and 1B, the imaging lens 1 includes, in order from an object side to an image side along an axis OA1, a first lens group LG11, a second lens group LG12, a third lens group LG13, a fourth lens group LG14 and an optical filter OF1, and a diaphragm ST1 is disposed between the second lens group LG12 and the third lens group LG13, but the position OF the diaphragm ST1 is not limited thereto. The optical filter OF1 has a planar object side surface S121 and an image side surface S122.
The first lens group LG11 includes a first lens L11. The second lens group LG12 includes a second lens L12 and a third lens L13 in order from an object side to an image side along an axis OA 1. The third lens group LG13 includes a fourth lens L14 and a fifth lens L15 in order from the object side to the image side along an axis OA 1. The fourth lens group LG14 includes a sixth lens L16, a seventh lens L17 and an eighth lens L18 in order from the object side to the image side along an axis OA 1. In imaging, light from an object (not shown) sequentially passes through the first lens group LG11, the second lens group LG12, the aperture ST1, the third lens group LG13, the fourth lens group LG14 and the optical filter OF1, and finally is imaged on the imaging plane IMA1.
According to the first to fifth paragraphs, wherein in this example, the object side surface S1016 of the eighth lens L108 is concave.
When the imaging lens 1 is zoomed from the wide-angle end (as shown in fig. 1A) to the telephoto end (as shown in fig. 1B), the first lens group LG11 is fixed, the second lens group LG12 is moved toward the object side along the axis OA1, the third lens group LG13 is moved toward the image side along the axis OA1, and the fourth lens group LG14 is fixed, so that the distance between the first lens group LG11 and the second lens group LG12 is reduced, the distance between the second lens group LG12 and the third lens group LG13 is increased, and the distance between the third lens group LG13 and the fourth lens group LG14 is reduced. The imaging lens 1 of the first embodiment has a zoom magnification of about 2.5 times (32.3 mm/12.9mm≡2.5) when zoomed from the wide-angle end (as shown in fig. 1A) to the telephoto end (as shown in fig. 1B).
By utilizing the lens, the aperture ST1 and the design at least meeting one of the conditions (1) to (11), the imaging lens 1 can effectively shorten the total length of the lens, effectively shorten the thickness of the lens, effectively improve the resolution, effectively correct the aberration, effectively correct the chromatic aberration and realize the optical zoom function.
The first table is a table of parameters related to each lens when the imaging lens 1 is at the wide-angle end and the telephoto end in fig. 1A and 1B, respectively. When the refractive power, surface shape and satisfying the conditions (1) to (11) of each lens in Table I are satisfied, a preferred embodiment of the present invention is provided.
List one
The aspherical surface dishing degree z of the aspherical lens in table one is obtained by the following formula, z=ch 2 /{1+[1-(k+1)c 2 h 2 ] 1/2 }+Ah 4 +Bh 6 +Ch 8 +Dh 10 +Eh 12 +Fh 14 +Gh 16 Wherein: c: curvature; h: a vertical distance from any point of the lens surface to the optical axis; k: a conic coefficient; A-G: aspheric coefficients.
Table two is a table of related parameters of the aspherical surface of the aspherical lens in table one, where k is a Conic Constant and a to G are aspherical coefficients.
Watch II
The third table is the related parameter values of the imaging lens 1 of the first embodiment and the calculated values corresponding to the conditions (1) to (11), and it can be seen from the third table that the imaging lens 1 of the first embodiment can meet the requirements of the conditions (1) to (11).
Watch III
In addition, the optical performance of the imaging lens 1 of the first embodiment can also meet the requirements. As can be seen from fig. 2A, the imaging lens 1 of the first embodiment has a curvature of field between-0.05 mm and 0.25mm at the wide-angle end. As can be seen from fig. 2B, the imaging lens 1 of the first embodiment has a distortion of between-3% and 0.02% at the wide angle end. As can be seen from fig. 2C, the modulation conversion function value of the imaging lens 1 of the first embodiment is between 0.48 and 1.0 at the wide-angle end. As can be seen from fig. 3A, the field curvature of the imaging lens 1 of the first embodiment is between-0.25 mm and 0.45mm at the telephoto end. As can be seen from fig. 3B, the distortion of the imaging lens 1 of the first embodiment is between 2.2% and 0% at the telephoto end. As can be seen from fig. 3C, the modulation conversion function value of the imaging lens 1 of the first embodiment is between 0.4 and 1.0 at the telescopic end. It is apparent that the curvature of field and distortion of the imaging lens 1 of the first embodiment can be effectively corrected, and the resolution of the lens can also be satisfied, thereby obtaining better optical performance.
A second embodiment of the imaging lens of the present invention will now be described in detail. Referring to fig. 4A and 4B, the imaging lens 2 includes, in order from an object side to an image side along an axis OA2, a first lens group LG21, a second lens group LG22, a third lens group LG23, a fourth lens group LG24, and an optical filter OF2, and a diaphragm ST2 is disposed between the second lens group LG22 and the third lens group LG23, but the position OF the diaphragm ST2 is not limited thereto. The optical filter OF2 has a planar object side surface S121 and an image side surface S122.
The first lens group LG21 includes a first lens L21. The second lens group LG22 includes a second lens L22 and a third lens L23 in order from an object side to an image side along an axis OA 2. The third lens group LG23 includes a fourth lens L24 and a fifth lens L25 in order from the object side to the image side along an axis OA 2. The fourth lens group LG24 includes a sixth lens L26, a seventh lens L27 and an eighth lens L28 in order from the object side to the image side along an axis OA 2. In imaging, light from an object (not shown) sequentially passes through the first lens group LG21, the second lens group LG22, the aperture ST2, the third lens group LG23, the fourth lens group LG24 and the optical filter OF2, and finally is imaged on the imaging plane IMA2.
According to the first to fifth paragraphs, wherein in this example, the object side surface S1016 of the eighth lens L208 is convex.
When the imaging lens 2 is zoomed from the wide-angle end (as shown in fig. 4A) to the telephoto end (as shown in fig. 4B), the first lens group LG21 is fixed, the second lens group LG22 is moved toward the object side along the axis OA2, the third lens group LG23 is moved toward the image side along the axis OA2, and the fourth lens group LG24 is fixed so that the distance between the first lens group LG21 and the second lens group LG22 becomes smaller, the distance between the second lens group LG22 and the third lens group LG23 becomes larger, and the distance between the third lens group LG23 and the fourth lens group LG24 becomes smaller. The imaging lens 1 of the second embodiment has a zoom magnification of about 2.5 times (32.3 mm/12.9mm≡2.5) when zoomed from the wide-angle end (as shown in fig. 4A) to the telephoto end (as shown in fig. 4B).
By utilizing the lens, the aperture ST2 and the design at least meeting one of the conditions (1) to (11), the imaging lens 1 can effectively shorten the total length of the lens and the thickness of the lens, so that the imaging lens can keep good optical performance in each focal section of zooming, effectively distribute the refractive power of a system and further reduce the sensitivity of the system.
Table four is a table of parameters related to each lens when the imaging lens 2 is at the wide-angle end and the telephoto end in fig. 4A and 4B, respectively. When the refractive power, the surface shape and the satisfying conditions (1) to (11) of each lens in table four are satisfied, a preferred embodiment of the present invention.
Table four
The definition of the aspherical surface dishing z of the aspherical lens in table four is the same as that of the aspherical lens in the first embodiment, and is not described here.
Table five is a table of related parameters of the aspherical surface of the aspherical lens in table four, where k is a Conic Constant and a to G are aspherical coefficients.
TABLE five
The sixth table is the relevant parameter values of the imaging lens 2 of the second embodiment and the calculated values corresponding to the conditions (1) to (11), and it can be seen from the sixth table that the imaging lens 2 of the second embodiment can meet the requirements of the conditions (1) to (11).
Watch III
In addition, the optical performance of the imaging lens 2 of the second embodiment can also meet the requirements. The imaging lens 2 of the second embodiment has a curvature of field of-0.08 mm to 0.06mm at the wide-angle end. The imaging lens 2 of the second embodiment has a distortion of between-0.2% and 1.2% at the wide-angle end. The modulation conversion function value of the imaging lens 2 of the second embodiment is between 0.5 and 1.0 at the wide-angle end. The imaging lens 2 of the second embodiment has a curvature of field between-0.4 mm and 0mm at the telephoto end. The imaging lens 2 of the second embodiment has a distortion of between-1.8% and 0.02% at the telephoto end. The modulation conversion function value of the imaging lens 2 of the second embodiment is between 0.45 and 1.0 at the telescopic end. It is apparent that the field curvature and distortion of the imaging lens 1 of the second embodiment can be effectively corrected, and the resolution of the lens can also meet the requirements, thereby obtaining better optical performance.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims (10)

1. An imaging lens, comprising:
a first lens group having a negative refractive power;
a second lens group having a positive refractive power;
a third lens group having a positive refractive power;
a fourth lens group having a positive refractive power;
wherein, the light from an object passes through the first lens group, the second lens group, the third lens group and the fourth lens group to the image side in sequence along the optical axis from the object side;
wherein the spacing of the lens groups can be changed so as to enable the imaging lens to zoom from a wide-angle end to a telescopic end;
the imaging lens at least meets one of the following conditions:
-0.1<f2/f7<-5；
-0.1<f2/f8<-5；
the imaging lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged from the object side to the image side along the optical axis, f2 is the focal length of the second lens, f7 is the focal length of the seventh lens, and f8 is the focal length of the eighth lens.
2. The imaging lens of claim 1, wherein the first lens group comprises the first lens, and the second lens group comprises the second lens and the third lens; the third lens group comprises the fourth lens and the fifth lens; the fourth lens group comprises the sixth lens, the seventh lens and the eighth lens; the first lens has a negative refractive power, the second lens has a positive refractive power, the third lens has a negative refractive power, the fourth lens has a negative refractive power, the fifth lens has a positive refractive power, the sixth lens has a positive refractive power, the seventh lens has a negative refractive power, and the eighth lens has a negative refractive power.
3. The imaging lens as claimed in claim 2, wherein the object-side surface of the second lens element is convex, and the image-side surface is convex; the third lens element has a convex object-side surface and a concave image-side surface.
4. The imaging lens as claimed in claim 2, wherein the fourth lens element has a convex object-side surface and a concave image-side surface; the fifth lens element has a convex object-side surface and a convex image-side surface.
5. The imaging lens as claimed in claim 2, wherein the sixth lens element is a meniscus lens element with a concave object-side surface and a convex image-side surface; the seventh lens is a meniscus lens, the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface; the image side surface of the eighth lens is concave.
6. The imaging lens as claimed in claim 5, wherein the first lens element is a meniscus lens element with a convex object-side surface and a concave image-side surface; the object side surface of the eighth lens is concave or convex.
7. The imaging lens according to any one of claims 1 to 6, wherein the imaging lens satisfies any one of the following conditions:
0.04<R22/R52<25；
-25<R42/R62<-0.04；
wherein R22 is the radius of curvature of the image side of the second lens; r52 is the radius of curvature of the image side of the fifth lens; r42 is the radius of curvature of the image side of the fourth lens; r62 is the radius of curvature of the image side of the sixth lens.
8. The imaging lens as claimed in any one of claims 1 to 6, wherein the imaging lens satisfies at least one of the following conditions:
0.1<DG12W/TTL<0.5；
0.1<DG34W/TTL<0.5；
0<DG23W/Dmax<1；
3.8<TTL/Dmax<5.2；
wherein DG12W is the distance between the first lens group and the second lens group along the axis at the wide-angle end, DG23W is the distance between the second lens group and the third lens group along the axis at the wide-angle end, DG34W is the distance between the third lens group and the fourth lens group along the axis at the wide-angle end, TTL is the distance between the object side surface of the lens closest to the object side and the imaging surface on the axis, dmax is the maximum optical effective diameter of all the lenses of the imaging lens.
9. The imaging lens as claimed in any one of claims 1-6, wherein the second lens group moves toward the object side along the axis, the third lens group moves toward the image side along the axis, and the first lens group and the fourth lens group are fixed so that the imaging lens is zoomed from a wide-angle end to a telephoto end.
10. The imaging lens as claimed in any one of claims 1 to 6, wherein the imaging lens satisfies at least one of the following conditions:
0.1<(DG12W-DG12T)/(fT-fW)<1；
0.1<(DG23T-DG23W)/(fT-fW)<1；
0.1<(DG34W-DG34T)/(fT-fW)<1；
wherein fW is an effective focal length of the imaging lens at the wide-angle end, fT is an effective focal length of the imaging lens at the telephoto end, DG12W is a pitch of the first lens group and the second lens group along the axis at the wide-angle end, DG12T is a pitch of the first lens group and the second lens group along the axis at the telephoto end, DG23W is a pitch of the second lens group and the third lens group along the axis at the wide-angle end, DG23T is a pitch of the second lens group and the third lens group along the axis at the telephoto end, DG34W is a pitch of the third lens group and the fourth lens group along the axis at the wide-angle end, DG34T is a pitch of the third lens group and the fourth lens group along the axis at the telephoto end.
CN202210379226.1A 2021-04-01 2022-04-12 Imaging lens Pending CN116931221A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
TW110112155A TWI774306B (en) 2021-04-01 2021-04-01 Lens assembly
TW110120775A TWI780750B (en) 2021-06-08 2021-06-08 Lens assembly
US17/711,071 US12124016B2 (en) 2021-04-01 2022-04-01 Lens assembly
US17/711,071 2022-04-01

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* Cited by examiner, † Cited by third party
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JP4869522B2 (en) * 2001-09-28 2012-02-08 オリンパス株式会社 Optical path bending zoom optical system
JP2005173191A (en) * 2003-12-11 2005-06-30 Olympus Corp Optical path bending optical system
JP4823630B2 (en) * 2005-09-28 2011-11-24 富士フイルム株式会社 Zoom lens
JP2007219316A (en) * 2006-02-17 2007-08-30 Nikon Corp Zoom lens and optical equipment equipped with the same

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