CN111077640A - Image pickup optical lens - Google Patents

Image pickup optical lens Download PDF

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Publication number
CN111077640A
CN111077640A CN201911229587.2A CN201911229587A CN111077640A CN 111077640 A CN111077640 A CN 111077640A CN 201911229587 A CN201911229587 A CN 201911229587A CN 111077640 A CN111077640 A CN 111077640A
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lens
lens element
image
curvature
radius
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CN111077640B (en
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孙雯
言俊杰
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Ruisheng Communication Technology Changzhou Co Ltd
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Ruisheng Communication Technology Changzhou Co Ltd
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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
    • 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
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

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

Abstract

The invention relates to the field of optical lenses, and discloses an image pickup optical lens, which sequentially comprises the following components from an object side to an image side: a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with positive refractive power, a fourth lens element with negative refractive power, a fifth lens element, a sixth lens element, a seventh lens element with positive refractive power, and an eighth lens element with negative refractive power; the focal length of the fourth lens is f4, the focal length of the whole imaging optical lens is f, the focal length of the seventh lens is f7, the on-axis thickness of the first lens is d1, the on-axis distance from the image side surface of the first lens to the object side surface of the second lens is d2, and the following relational expressions are satisfied: f4/f is not less than 11.00 and not more than-5.00; f7/f is more than or equal to 2.50 and less than or equal to 8.00; d1/d2 is more than or equal to 6.00 and less than or equal to 10.00. The camera optical lens provided by the invention has good optical performance, and meets the design requirements of large aperture, wide angle and ultra-thinness.

Description

Image pickup optical lens
[ technical field ] A method for producing a semiconductor device
The present invention relates to the field of optical lenses, and more particularly, to an imaging optical lens suitable for portable terminal devices such as smart phones and digital cameras, and imaging apparatuses such as monitors and PC lenses.
[ background of the invention ]
In recent years, with the rise of smart phones, the demand of miniaturized camera lenses is increasing, and the photosensitive devices of general camera lenses are not limited to two types, namely, a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor (CMOS) Device, and due to the refinement of Semiconductor manufacturing technology, the pixel size of the photosensitive devices is reduced, and in addition, the current electronic products are developed in a form of being excellent in function, light, thin, short and small, so that the miniaturized camera lenses with good imaging quality are the mainstream in the current market.
In order to obtain better imaging quality, the lens mounted on the mobile phone camera conventionally adopts three-piece, four-piece, five-piece, or even six-piece and seven-piece lens structures. However, with the development of technology and the increasing demand of diversified users, under the condition that the pixel area of the photosensitive device is continuously reduced and the requirement of the system for the imaging quality is continuously improved, an eight-piece lens structure gradually appears in the lens design, although a common eight-piece lens has good optical performance, the focal power, the lens pitch and the lens shape setting still have certain irrationality, so that the design requirements of large aperture, ultra-thinning and wide-angle cannot be met while the lens structure has good optical performance.
[ summary of the invention ]
In view of the above problems, an object of the present invention is to provide an imaging optical lens that has good optical performance and satisfies design requirements for a large aperture, ultra-thin thickness, and wide angle.
To solve the above-mentioned problems, the present invention provides an imaging optical lens, in order from an object side to an image side, comprising: a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with positive refractive power, a fourth lens element with negative refractive power, a fifth lens element, a sixth lens element, a seventh lens element with positive refractive power, and an eighth lens element with negative refractive power;
a focal length of the fourth lens element is f4, a focal length of the entire imaging optical lens is f, a focal length of the seventh lens element is f7, an on-axis thickness of the first lens element is d1, and an on-axis distance from an image-side surface of the first lens element to an object-side surface of the second lens element is d2, and the following relationships are satisfied: f4/f is not less than 11.00 and not more than-5.00; f7/f is more than or equal to 2.50 and less than or equal to 8.00; d1/d2 is more than or equal to 6.00 and less than or equal to 10.00.
Preferably, the radius of curvature of the object-side surface of the third lens is R5, and the radius of curvature of the image-side surface of the third lens is R6, and the following relationships are satisfied: 3.50 is less than or equal to (R5+ R6)/(R5-R6) is less than or equal to-2.50.
Preferably, an on-axis distance from an image-side surface of the seventh lens element to an object-side surface of the eighth lens element is d14, an on-axis thickness of the eighth lens element is d15, and the following relationship is satisfied: d14/d15 is more than or equal to 2.00 and less than or equal to 4.00.
Preferably, the focal length of the first lens element is f1, the radius of curvature of the object-side surface of the first lens element is R1, the radius of curvature of the image-side surface of the first lens element is R2, and the total optical length of the imaging optical lens system is TTL and satisfies the following relationship: f1/f is more than or equal to 0.38 and less than or equal to 1.31; -4.10 ≤ (R1+ R2)/(R1-R2) ≤ 1.03; d1/TTL is more than or equal to 0.06 and less than or equal to 0.21.
Preferably, the focal length of the second lens element is f2, the curvature radius of the object-side surface of the second lens element is R3, the curvature radius of the image-side surface of the second lens element is R4, the on-axis thickness of the second lens element is d3, the total optical length of the image pickup optical lens is TTL, and the following relationships are satisfied: f2/f is more than or equal to-3.66 and less than or equal to-1.02; (R3+ R4)/(R3-R4) is not more than 0.94 and not more than 3.85; d3/TTL is more than or equal to 0.02 and less than or equal to 0.05.
Preferably, the focal length of the third lens is f3, the on-axis thickness of the third lens is d5, the total optical length of the imaging optical lens is TTL, and the following relation is satisfied: f3/f is more than or equal to 1.18 and less than or equal to 5.33; d5/TTL is more than or equal to 0.02 and less than or equal to 0.08.
Preferably, the curvature radius of the object-side surface of the fourth lens element is R7, the curvature radius of the image-side surface of the fourth lens element is R8, the on-axis thickness of the fourth lens element is d7, and the total optical length of the imaging optical lens system is TTL and satisfies the following relationship: -21.29 ≤ (R7+ R8)/(R7-R8) 0.71; d7/TTL is more than or equal to 0.02 and less than or equal to 0.06.
Preferably, the focal length of the fifth lens element is f5, the curvature radius of the object-side surface of the fifth lens element is R9, the curvature radius of the image-side surface of the fifth lens element is R10, the on-axis thickness of the fifth lens element is d9, the total optical length of the imaging optical lens assembly is TTL, and the following relationships are satisfied: -181.79 ≦ f5/f ≦ 22.58; -21.86 ≤ (R9+ R10)/(R9-R10) ≤ 70.33; d9/TTL is more than or equal to 0.02 and less than or equal to 0.06.
Preferably, the focal length of the sixth lens element is f6, the radius of curvature of the object-side surface of the sixth lens element is R11, the radius of curvature of the image-side surface of the sixth lens element is R12, the on-axis thickness of the sixth lens element is d11, and the total optical length of the imaging optical lens system is TTL, and the following relationships are satisfied: f6/f is not more than 91.36; -377.45 (R11+ R12)/(R11-R12) 112.46; d11/TTL is more than or equal to 0.03 and less than or equal to 0.08.
Preferably, a curvature radius of an object-side surface of the seventh lens element is R13, a curvature radius of an image-side surface of the seventh lens element is R14, an on-axis thickness of the seventh lens element is d13, and an optical total length of the imaging optical lens system is TTL, and satisfies the following relational expression: -54.41 (R13+ R14)/(R13-R14) is less than or equal to-6.24; d13/TTL is more than or equal to 0.03 and less than or equal to 0.10.
Preferably, the focal length of the eighth lens element is f8, the radius of curvature of the object-side surface of the eighth lens element is R15, the radius of curvature of the image-side surface of the eighth lens element is R16, the on-axis thickness of the eighth lens element is d15, and the total optical length of the imaging optical lens system is TTL, and the following relationships are satisfied: f8/f is not less than 1.90 and not more than-0.56; -2.65 ≤ (R15+ R16)/(R15-R16) ≤ 0.43; d15/TTL is more than or equal to 0.03 and less than or equal to 0.13.
The invention has the advantages that the camera optical lens has good optical performance, has the characteristics of large aperture, wide angle and ultra-thin, and is particularly suitable for mobile phone camera lens components and WEB camera lenses which are composed of high-pixel CCD, CMOS and other camera elements.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
fig. 1 is a schematic configuration diagram of an imaging optical lens according to a first embodiment;
fig. 2 is a schematic view of axial aberrations of the image-taking optical lens shown in fig. 1;
fig. 3 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 1;
FIG. 4 is a schematic view of curvature of field and distortion of the imaging optical lens shown in FIG. 1;
fig. 5 is a schematic configuration diagram of an imaging optical lens according to a second embodiment;
fig. 6 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 5;
fig. 7 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 5;
FIG. 8 is a schematic view of curvature of field and distortion of the imaging optical lens shown in FIG. 5;
fig. 9 is a schematic configuration diagram of an imaging optical lens according to a third embodiment;
fig. 10 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 9;
fig. 11 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 9;
fig. 12 is a schematic view of curvature of field and distortion of the imaging optical lens shown in fig. 9;
fig. 13 is a schematic configuration diagram of an imaging optical lens according to a fourth embodiment;
fig. 14 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 13;
fig. 15 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 13;
fig. 16 is a schematic view of curvature of field and distortion of the imaging optical lens shown in fig. 13.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present invention in its various embodiments. However, the technical solution claimed in the present invention can be implemented without these technical details and various changes and modifications based on the following embodiments.
(first embodiment)
Referring to the drawings, the present invention provides an image pickup optical lens 10. Fig. 1 shows an imaging optical lens 10 according to a first embodiment of the present invention, and the imaging optical lens 10 includes eight lenses. Specifically, the imaging optical lens 10, in order from an object side to an image side, includes: the stop S1, the first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, the fifth lens element L5, the sixth lens element L6, the seventh lens element L7 with positive refractive power, and the eighth lens element L8 with negative refractive power. An optical element such as an optical filter (filter) GF may be disposed between the eighth lens L8 and the image plane Si.
In the present embodiment, the focal length of the fourth lens L4 is defined as f4, and the focal length of the imaging optical lens 10 is defined as f, and the following relational expression is satisfied: f4/f is not less than 11.00 and not more than-5.00, the ratio of the focal length of the fourth lens L4 to the focal length of the image pickup optical lens 10 is specified, the focal power of the fourth lens L4 can be effectively distributed within the condition range, the aberration of the optical system can be corrected, and the imaging quality is improved.
The focal length of the seventh lens L7 is f7, and the following relation is satisfied: f7/f is not less than 2.50 and not more than 8.00, the ratio of the focal length of the seventh lens L7 to the focal length of the image pickup optical lens 10 is specified, and the improvement of the optical system performance is facilitated within the condition range.
The on-axis thickness of the first lens L1 is d1, the on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2 is d2, and the following relation is satisfied: the ratio of the on-axis thickness d1 of the first lens L1 to the on-axis distance d2 from the image side surface of the first lens L1 to the object side surface of the second lens L2 is regulated to be 6.00 < d1/d2 < 10.00, and the processing of the lens and the assembly of the lens are facilitated within the conditional expression range.
The curvature radius of the object side surface of the third lens L3 is defined as R5, the curvature radius of the image side surface of the third lens L3 is defined as R6, and the following relational expressions are satisfied: 3.50 ≦ (R5+ R6)/(R5-R6) ≦ -2.50, and defines the shape of the third lens L3, and within the range defined by the conditional expression, the degree of deflection of the light passing through the lens can be alleviated, and the aberration can be effectively reduced.
Defining an on-axis distance d14 from an image-side surface of the seventh lens L7 to an object-side surface of the eighth lens L8, an on-axis thickness d15 of the eighth lens L8, the following relationship is satisfied: 2.00-d 14/d 15-4.00, and the ratio of the on-axis distance d14 from the image side surface of the seventh lens L7 to the object side surface of the eighth lens L8 to the on-axis thickness d15 of the eighth lens L8 is regulated, so that the field curvature of the system can be balanced and the image plane imaging quality can be improved within a condition range.
Defining the focal length of the first lens L1 as f1, the following relation is satisfied: f1/f is 0.38 ≦ 1.31, and the ratio of the focal length f1 of the first lens L1 to the focal length f of the imaging optical lens 10 is specified. In the conditional range, the first lens element L1 has a proper positive refractive power, which is beneficial to reducing system aberration and is beneficial to the development of ultra-thinning and wide-angle lens. Preferably, 0.61. ltoreq. f 1/f. ltoreq.1.05.
The curvature radius of the object side surface of the first lens L1 is R1, the curvature radius of the image side surface of the first lens L1 is R2, and the following relational expression is satisfied: 4.10 ≦ (R1+ R2)/(R1-R2) ≦ -1.03, the shape of the first lens L1 is specified, and the shape of the first lens L1 is reasonably controlled within the conditional expression range, so that the first lens L1 can effectively correct the system spherical aberration. Preferably, -2.56 ≦ (R1+ R2)/(R1-R2). ltoreq.1.29.
The total optical length of the imaging optical lens 10 is TTL, and the on-axis thickness of the first lens L1 is d1, which satisfies the following relation: d1/TTL is more than or equal to 0.06 and less than or equal to 0.21, and ultra-thinning is facilitated in the conditional expression range. Preferably, 0.10. ltoreq. d 1/TTL. ltoreq.0.17.
Defining the focal length of the second lens L2 as f2, the following relation is satisfied: -3.66 ≦ f2/f ≦ -1.02, specifying the ratio of the focal length f2 of the second lens to the focal length f of the image-taking optical lens 10, and within the conditional expression range, by controlling the negative power of the second lens L2 within a reasonable range, it is advantageous to correct the aberration of the optical system. Preferably, -2.29. ltoreq. f 2/f. ltoreq-1.28.
The curvature radius of the object side surface of the second lens L2 is R3, and the curvature radius of the image side surface of the second lens L2 is R4, and the following relations are satisfied: the shape of the second lens L2 is defined to be not less than 0.94 (R3+ R4)/(R3-R4) and not more than 3.85, and the problem of chromatic aberration on the axis is favorably corrected as the lens becomes thinner and wider in angle within the conditional expression range. Preferably, 1.51 ≦ (R3+ R4)/(R3-R4). ltoreq.3.08.
The on-axis thickness of the second lens L2 is d3, and the following relation is satisfied: d3/TTL is more than or equal to 0.02 and less than or equal to 0.05, and ultra-thinning is facilitated in the condition formula range. Preferably, 0.03. ltoreq. d 3/TTL. ltoreq.0.04.
Defining the focal length of the third lens L3 as f3, the following relation is satisfied: f3/f is more than or equal to 1.18 and less than or equal to 5.33, the ratio of the focal length f3 of the third lens L3 to the focal length f of the image pickup optical lens 10 is specified, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power within the conditional expression range. Preferably, 1.89. ltoreq. f 3/f. ltoreq.4.27.
The third lens L3 has an on-axis thickness d5, and satisfies the following relation: d5/TTL is more than or equal to 0.02 and less than or equal to 0.08, and ultra-thinning is favorably realized within the range of conditional expressions. Preferably, 0.04. ltoreq. d 5/TTL. ltoreq.0.06.
The radius of curvature of the object-side surface of the fourth lens L4 is defined as R7, and the radius of curvature of the image-side surface of the fourth lens L4 is defined as R8, and the following relationship-21.29 ≦ (R7+ R8)/(R7-R8) ≦ -0.71 is satisfied. The shape of the fourth lens L4 is defined, and it is advantageous to correct the problem of aberration of the off-axis view angle and the like as the thickness becomes thinner and the angle becomes wider within the conditional expression. Preferably, -13.30 ≦ (R7+ R8)/(R7-R8) ≦ -0.89.
The on-axis thickness of the fourth lens L4 is d7, and the following relation is satisfied: d7/TTL is more than or equal to 0.02 and less than or equal to 0.06, and ultra-thinning is facilitated in the conditional expression range. Preferably, 0.03. ltoreq. d 7/TTL. ltoreq.0.05.
Defining the focal length of the fifth lens L5 as f5, the following relation is satisfied: -181.79 ≦ f5/f ≦ 22.58, which specifies the ratio of the focal length f5 of the fifth lens L5 to the focal length f of the image-taking optical lens 10, and within the conditional expression, the definition of the fifth lens L5 is effective to make the light angle of the image-taking optical lens 10 gentle and reduce the tolerance sensitivity. Preferably, -113.62 ≦ f5/f ≦ 18.06.
The curvature radius of the object side surface of the fifth lens L5 is R9, the curvature radius of the image side surface of the fifth lens L5 is R10, and the following relational expression is satisfied: the shape of the fifth lens L5 is determined to be (R9+ R10)/(R9-R10) to 70.33) to be not more than 21.86, and the problem of aberration of an off-axis picture angle and the like can be favorably corrected as the ultra-thin wide angle is developed within the condition range. Preferably, -13.66 ≦ (R9+ R10)/(R9-R10). ltoreq. 56.26.
The on-axis thickness of the fifth lens L5 is d9, and the following relation is satisfied: d9/TTL is more than or equal to 0.02 and less than or equal to 0.06, and ultra-thinning is facilitated in the conditional expression range. Preferably, 0.03. ltoreq. d 9/TTL. ltoreq.0.05.
Defining the focal length of the sixth lens L6 as f6, the following relation is satisfied: f6/f is less than or equal to 91.36, the ratio of the focal length f6 of the sixth lens L6 to the focal length f of the image pickup optical lens 10 is regulated, and the system has better imaging quality and lower sensitivity through reasonable distribution of focal power within the range of the conditional expression. Preferably, f6/f is not more than 73.09.
The curvature radius of the object-side surface of the sixth lens L6 is R11, and the curvature radius of the image-side surface of the sixth lens L6 is R12, and the following relations are satisfied: -377.45 ≦ (R11+ R12)/(R11-R12) ≦ 112.46, and the shape of the sixth lens L6 is specified, which is advantageous for correcting the aberration of the off-axis view angle and the like with the development of the ultra-thin wide angle within the conditional expression range. Preferably, -235.91 ≦ (R11+ R12)/(R11-R12) ≦ 89.96.
The sixth lens L6 has an on-axis thickness d11, and satisfies the following relation: d11/TTL is more than or equal to 0.03 and less than or equal to 0.08, and ultra-thinning is favorably realized within the range of conditional expressions. Preferably, 0.04. ltoreq. d 11/TTL. ltoreq.0.06.
The curvature radius of the object side surface of the seventh lens L7 is defined as R13, and the curvature radius of the image side surface of the seventh lens L7 is defined as R14, and the following relations are satisfied: the ratio of (R13+ R14)/(R13-R14) is less than or equal to-54.41 and less than or equal to-6.24. The shape of the seventh lens L7 is specified, and it is advantageous to correct problems such as off-axis aberration with the progress of an extremely thin and wide angle within the conditional expression. Preferably, -34.01 ≦ (R13+ R14)/(R13-R14) ≦ -7.80.
The on-axis thickness of the seventh lens L7 is d13, and the following relation is satisfied: d13/TTL is more than or equal to 0.03 and less than or equal to 0.10, and ultra-thinning is favorably realized within the range of conditional expressions. Preferably, 0.04. ltoreq. d 13/TTL. ltoreq.0.08.
The focal length of the eighth lens L8 is f8, and the following relation is satisfied: f8/f is not less than 1.90 and not more than-0.56. The ratio of the focal length f8 of the eighth lens L8 to the focal length f of the image pickup optical lens 10 is specified, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power within a conditional expression range. Preferably, -1.18. ltoreq. f 8/f. ltoreq-0.70.
The curvature radius of the object side surface of the eighth lens L8 is R15, the curvature radius of the image side surface of the eighth lens L8 is R16, and the following relational expression is satisfied: 2.65-0.43 of (R15+ R16)/(R15-R16). The shape of the eighth lens L8 is specified, and is advantageous for correcting problems such as off-axis aberration and the like as the angle of view becomes thinner and wider within the range of the conditional expression. Preferably, -1.66 ≦ (R15+ R16)/(R15-R16). ltoreq.0.54.
The eighth lens has an on-axis thickness d15, and satisfies the following relationship: d15/TTL is more than or equal to 0.03 and less than or equal to 0.13, and ultra-thinning is favorably realized within the range of conditional expressions. Preferably, 0.04. ltoreq. d 15/TTL. ltoreq.0.10.
In this embodiment, the total optical length of the image pickup optical lens is TTL, the image height of the image pickup optical lens is IH, and the following relationship is satisfied: TTL/IH is less than or equal to 1.22, and ultra-thinning is facilitated.
In the present embodiment, the F-number of the imaging optical lens is Fno, and the following relationship is satisfied: fno is less than or equal to 1.95, which is beneficial to realizing large aperture and ensures good imaging performance.
That is, when the above relationship is satisfied, the imaging optical lens 10 can satisfy the design requirements of a large aperture, a wide angle of view, and an ultra-thin film while having a good optical imaging performance; in accordance with the characteristics of the imaging optical lens 10, the imaging optical lens 10 is particularly suitable for a mobile phone imaging lens module and a WEB imaging lens which are configured by an imaging element such as a high-pixel CCD or a CMOS.
The image pickup optical lens 10 of the present invention will be explained below by way of example. The symbols described in the respective examples are as follows. The unit of focal length, on-axis distance, curvature radius, on-axis thickness, position of reverse curvature and position of stagnation point is mm.
TTL (total optical length) (on-axis distance from the object side surface of the first lens L1 to the image plane Si) in mm;
preferably, the object side surface and/or the image side surface of the lens may be further provided with an inflection point and/or a stagnation point to meet the requirement of high-quality imaging.
Tables 1 and 2 show design data of the imaging optical lens 10 according to the first embodiment of the present invention.
[ TABLE 1 ]
Figure BDA0002303163790000071
Figure BDA0002303163790000081
Wherein each symbol has the following meaning.
S1: an aperture;
r: the radius of curvature of the optical surface and the radius of curvature of the lens as the center;
r1: the radius of curvature of the object-side surface of the first lens L1;
r2: the radius of curvature of the image-side surface of the first lens L1;
r3: the radius of curvature of the object-side surface of the second lens L2;
r4: the radius of curvature of the image-side surface of the second lens L2;
r5: the radius of curvature of the object-side surface of the third lens L3;
r6: the radius of curvature of the image-side surface of the third lens L3;
r7: the radius of curvature of the object-side surface of the fourth lens L4;
r8: the radius of curvature of the image-side surface of the fourth lens L4;
r9: a radius of curvature of the object side surface of the fifth lens L5;
r10: a radius of curvature of the image-side surface of the fifth lens L5;
r11: a radius of curvature of the object side surface of the sixth lens L6;
r12: a radius of curvature of the image-side surface of the sixth lens L6;
r13: a radius of curvature of the object side surface of the seventh lens L7;
r14: a radius of curvature of the image-side surface of the seventh lens L7;
r15: a radius of curvature of the object side surface of the eighth lens L8;
r16: a radius of curvature of the image-side surface of the eighth lens L8;
r17: radius of curvature of the object side of the optical filter GF;
r18: the radius of curvature of the image-side surface of the optical filter GF;
d: an on-axis thickness of the lenses and an on-axis distance between the lenses;
d 0: the on-axis distance of the stop S1 to the object-side surface of the first lens L1;
d 1: the on-axis thickness of the first lens L1;
d 2: the on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2;
d 3: the on-axis thickness of the second lens L2;
d 4: the on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;
d 5: the on-axis thickness of the third lens L3;
d 6: the on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4;
d 7: the on-axis thickness of the fourth lens L4;
d 8: an on-axis distance from an image-side surface of the fourth lens L4 to an object-side surface of the fifth lens L5;
d 9: the on-axis thickness of the fifth lens L5;
d 10: an on-axis distance from an image-side surface of the fifth lens L5 to an object-side surface of the sixth lens L6;
d 11: the on-axis thickness of the sixth lens L6;
d 12: an on-axis distance from the image-side surface of the sixth lens L6 to the object-side surface of the seventh lens L7;
d 13: the on-axis thickness of the seventh lens L7;
d 14: an on-axis distance from the image-side surface of the seventh lens L7 to the object-side surface of the eighth lens L8;
d 15: the on-axis thickness of the eighth lens L8;
d 16: the on-axis distance from the image-side surface of the eighth lens L8 to the object-side surface of the optical filter GF;
d 17: on-axis thickness of the optical filter GF;
d 18: the on-axis distance from the image side surface of the optical filter GF to the image surface;
nd: the refractive index of the d-line;
nd 1: the refractive index of the d-line of the first lens L1;
nd 2: the refractive index of the d-line of the second lens L2;
nd 3: the refractive index of the d-line of the third lens L3;
nd 4: the refractive index of the d-line of the fourth lens L4;
nd 5: the refractive index of the d-line of the fifth lens L5;
nd 6: the refractive index of the d-line of the sixth lens L6;
nd 7: the refractive index of the d-line of the seventh lens L7;
nd 8: the refractive index of the d-line of the eighth lens L8;
ndg: the refractive index of the d-line of the optical filter GF;
v d: an Abbe number;
v 1: abbe number of the first lens L1;
v 2: abbe number of the second lens L2;
v 3: abbe number of the third lens L3;
v 4: abbe number of the fourth lens L4;
v 5: abbe number of the fifth lens L5;
v 6: abbe number of the sixth lens L6;
v 7: abbe number of the seventh lens L7;
v 8: abbe number of the eighth lens L8;
v g: abbe number of the optical filter GF.
Table 2 shows aspherical surface data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention.
[ TABLE 2 ]
Figure BDA0002303163790000091
Figure BDA0002303163790000101
Wherein k is a conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18, A20 are aspheric coefficients.
y＝(x2/R)/[1+{1-(k+1)(x2/R2)}1/2]+A4x4+A6x6+A8x8+A10x10+A12x12+A14x14+A16x16+A18x18+A20x20(1)
For convenience, the aspherical surface of each lens surface uses the aspherical surface shown in the above formula (1). However, the present invention is not limited to the aspherical polynomial form expressed by this formula (1).
Tables 3 and 4 show the inflection point and stagnation point design data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention. Wherein P1R1 and P1R2 represent the object-side surface and the image-side surface of the first lens L1, P2R1 and P2R2 represent the object-side surface and the image-side surface of the second lens L2, P3R1 and P3R2 represent the object-side surface and the image-side surface of the third lens L3, P4R1 and P4R2 represent the object-side surface and the image-side surface of the fourth lens L4, P5R1 and P5R2 represent the object-side surface and the image-side surface of the fifth lens L5, P6R1 and P6R2 represent the object-side surface and the image-side surface of the sixth lens L6, P7R1 and P7R2 represent the object-side surface and the image-side surface of the seventh lens L7, and P8R1 and P8R2 represent the object-side surface and the image-side surface of the eighth lens L8, respectively. The "inflection point position" field correspondence data is a vertical distance from an inflection point set on each lens surface to the optical axis of the image pickup optical lens 10. The "stagnation point position" field corresponding data is the vertical distance from the stagnation point set on each lens surface to the optical axis of the imaging optical lens 10.
[ TABLE 3 ]
Number of points of inflection Position of reverse curvature 1 Position of reverse curvature 2
P1R1 1 2.205 0
P1R2 2 1.795 2.195
P2R1 0 0 0
P2R2 0 0 0
P3R1 0 0 0
P3R2 2 0.965 1.255
P4R1 0 0 0
P4R2 0 0 0
P5R1 1 0.385 0
P5R2 2 0.435 2.335
P6R1 1 2.605 0
P6R2 2 2.715 3.045
P7R1 2 0.725 3.615
P7R2 2 0.815 3.975
P8R1 1 3.315 0
P8R2 2 5.395 6.135
[ TABLE 4 ]
Figure BDA0002303163790000111
Figure BDA0002303163790000121
Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 436nm, 486nm, 546nm, 587nm, and 656nm passing through the imaging optical lens 10 according to the first embodiment. Fig. 4 is a schematic view showing the field curvature and distortion of light having a wavelength of 546nm after passing through the imaging optical lens 10 according to the first embodiment, where the field curvature S in fig. 4 is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction.
Table 17 shown later shows values corresponding to the parameters defined in the conditional expressions, for each of the numerical values in the first, second, third, and fourth embodiments.
As shown in table 17, the first embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens 10 has an entrance pupil diameter of 4.665mm, a full field image height of 8.000mm, and a diagonal field angle of 80.00 °, so that the imaging optical lens 10 has a wide angle, an ultra-thin, and a large aperture, and its on-axis and off-axis chromatic aberration is sufficiently corrected, and has excellent optical characteristics.
(second embodiment)
The second embodiment is basically the same as the first embodiment, and the reference numerals are the same as those in the first embodiment, and the configuration of the image pickup optical lens 20 of the second embodiment is shown in fig. 5, and only the differences will be described below.
Tables 5 and 6 show design data of the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 5 ]
Figure BDA0002303163790000122
Figure BDA0002303163790000131
Table 6 shows aspherical surface data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 6 ]
Figure BDA0002303163790000132
Tables 7 and 8 show the inflection point and stagnation point design data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 7 ]
Number of points of inflection Position of reverse curvature 1 Position of reverse curvature 2 Position of reverse curvature 3
P1R1 1 2.105 0 0
P1R2 2 1.645 2.125 0
P2R1 0 0 0 0
P2R2 1 1.905 0 0
P3R1 1 1.955 0 0
P3R2 2 0.815 1.355 0
P4R1 0 0 0 0
P4R2 1 2.035 0 0
P5R1 2 0.465 2.065 0
P5R2 2 0.455 2.165 0
P6R1 1 2.655 0 0
P6R2 2 2.695 2.975 0
P7R1 3 0.895 3.625 4.405
P7R2 2 1.075 4.035 0
P8R1 1 3.665 0 0
P8R2 1 5.535 0 0
[ TABLE 8 ]
Figure BDA0002303163790000141
Figure BDA0002303163790000151
Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 436nm, 486nm, 546nm, 587nm, and 656nm passing through the imaging optical lens 20 according to the second embodiment. Fig. 8 is a schematic view showing curvature of field and distortion of light having a wavelength of 546nm after passing through the imaging optical lens 20 according to the second embodiment.
Table 17 below shows the numerical values corresponding to the respective conditional expressions in the present embodiment in accordance with the conditional expressions. Obviously, the imaging optical lens of the present embodiment satisfies the above conditional expressions.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 4.669mm, a full field image height of 8.000mm, and a diagonal field angle of 80.00 °, so that the imaging optical lens 20 has a wide angle, an ultra-thin, and a large aperture, and its on-axis and off-axis chromatic aberration is sufficiently corrected, and has excellent optical characteristics.
(third embodiment)
The third embodiment is basically the same as the first embodiment, and the reference numerals are the same as those in the first embodiment, and the configuration of the imaging optical lens 30 of the third embodiment is shown in fig. 9, and only the differences will be described below.
Tables 9 and 10 show design data of the imaging optical lens 30 according to the third embodiment of the present invention.
[ TABLE 9 ]
Figure BDA0002303163790000152
Figure BDA0002303163790000161
Table 10 shows aspherical surface data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.
[ TABLE 10 ]
Figure BDA0002303163790000162
Tables 11 and 12 show the inflection points and the stagnation point design data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.
[ TABLE 11 ]
Figure BDA0002303163790000163
Figure BDA0002303163790000171
[ TABLE 12 ]
Figure BDA0002303163790000172
Figure BDA0002303163790000181
Fig. 10 and 11 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 436nm, 486nm, 546nm, 587nm, and 656nm passing through the imaging optical lens 30 according to the third embodiment. Fig. 12 is a schematic view showing curvature of field and distortion of light having a wavelength of 546nm after passing through the imaging optical lens 30 according to the third embodiment.
Table 17 below shows the numerical values corresponding to the respective conditional expressions in the present embodiment in accordance with the conditional expressions. Obviously, the imaging optical lens of the present embodiment satisfies the above conditional expressions.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 4.640mm, a full field image height of 8.000mm, and a diagonal field angle of 80.00 °, so that the imaging optical lens 30 has a wide angle, an ultra-thin, and a large aperture, and its on-axis and off-axis chromatic aberration is sufficiently corrected, and has excellent optical characteristics.
(fourth embodiment)
The fourth embodiment is basically the same as the first embodiment, and the reference numerals are the same as those in the first embodiment, and the configuration of the imaging optical lens 40 of the fourth embodiment is shown in fig. 13, and only the differences will be described below.
Tables 13 and 14 show design data of the imaging optical lens 40 according to the fourth embodiment of the present invention.
[ TABLE 13 ]
Figure BDA0002303163790000182
Figure BDA0002303163790000191
Table 14 shows aspherical surface data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.
[ TABLE 14 ]
Figure BDA0002303163790000192
Tables 15 and 16 show the inflection points and the stagnation point design data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.
[ TABLE 15 ]
Figure BDA0002303163790000193
Figure BDA0002303163790000201
[ TABLE 16 ]
Number of stagnation points Location of stagnation 1
P1R1 0 0
P1R2 0 0
P2R1 0 0
P2R2 0 0
P3R1 0 0
P3R2 0 0
P4R1 0 0
P4R2 0 0
P5R1 1 0.785
P5R2 1 0.675
P6R1 0 0
P6R2 0 0
P7R1 1 1.605
P7R2 1 2.155
P8R1 1 6.315
P8R2 1 1.205
Fig. 14 and 15 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 436nm, 486nm, 546nm, 587nm, and 656nm passing through the imaging optical lens 40 according to the fourth embodiment. Fig. 16 is a schematic view showing curvature of field and distortion of light having a wavelength of 546nm after passing through the imaging optical lens 40 according to the fourth embodiment.
Table 17 below shows the numerical values corresponding to the respective conditional expressions in the present embodiment in accordance with the conditional expressions. Obviously, the imaging optical lens of the present embodiment satisfies the above conditional expressions.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 4.648mm, a full field image height of 8.000mm, and a diagonal field angle of 80.00 °, so that the imaging optical lens 40 has a wide angle, an ultra-thin, and a large aperture, and its on-axis and off-axis chromatic aberration is sufficiently corrected, and has excellent optical characteristics.
[ TABLE 17 ]
Parameter and condition formula Embodiment mode 1 Embodiment mode 2 Embodiment 3 Embodiment 4
f 9.004 9.011 8.955 8.971
f1 6.859 7.082 7.011 7.830
f2 -13.782 -15.608 -16.377 -14.756
f3 27.484 29.482 31.846 21.147
f4 -94.618 -75.772 -46.927 -64.020
f5 -148.040 -819.071 134.809 61.749
f6 43.197 104.779 545.449 -718458.271
f7 67.092 28.118 26.199 31.592
f8 -8.532 -7.938 -7.902 -7.486
f12 11.312 11.038 10.535 13.382
f4/f -10.51 -8.41 -5.24 -7.14
f7/f 7.45 3.12 2.93 3.52
d1/d2 8.75 8.63 9.15 6.84
Fno 1.93 1.93 1.93 1.93
Where Fno is the F-number of the diaphragm of the imaging optical lens.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific embodiments for practicing the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.

Claims (11)

1. An imaging optical lens, in order from an object side to an image side, comprising: a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with positive refractive power, a fourth lens element with negative refractive power, a fifth lens element, a sixth lens element, a seventh lens element with positive refractive power, and an eighth lens element with negative refractive power;
a focal length of the fourth lens element is f4, a focal length of the entire imaging optical lens is f, a focal length of the seventh lens element is f7, an on-axis thickness of the first lens element is d1, and an on-axis distance from an image-side surface of the first lens element to an object-side surface of the second lens element is d2, and the following relationships are satisfied:
-11.00≤f4/f≤-5.00；
2.50≤f7/f≤8.00；
6.00≤d1/d2≤10.00。
2. the imaging optical lens according to claim 1, wherein a radius of curvature of an object-side surface of the third lens is R5, and a radius of curvature of an image-side surface of the third lens is R6, and the following relational expression is satisfied:
-3.50≤(R5+R6)/(R5-R6)≤-2.50。
3. the imaging optical lens of claim 1, wherein an on-axis distance from an image-side surface of the seventh lens element to an object-side surface of the eighth lens element is d14, and an on-axis thickness of the eighth lens element is d15, and the following relationship is satisfied:
2.00≤d14/d15≤4.00。
4. the image-capturing optical lens unit according to claim 1, wherein the first lens element has a focal length f1, a radius of curvature of the object-side surface of the first lens element is R1, a radius of curvature of the image-side surface of the first lens element is R2, and the image-capturing optical lens unit has a total optical length TTL satisfying the following relationships:
0.38≤f1/f≤1.31；
-4.10≤(R1+R2)/(R1-R2)≤-1.03；
0.06≤d1/TTL≤0.21。
5. the imaging optical lens of claim 1, wherein the second lens has a focal length of f2, a radius of curvature of an object-side surface of the second lens is R3, a radius of curvature of an image-side surface of the second lens is R4, an on-axis thickness of the second lens is d3, and an optical total length of the imaging optical lens is TTL and satisfies the following relationship:
-3.66≤f2/f≤-1.02；
0.94≤(R3+R4)/(R3-R4)≤3.85；
0.02≤d3/TTL≤0.05。
6. the image-capturing optical lens of claim 1, wherein the focal length of the third lens is f3, the on-axis thickness of the third lens is d5, the total optical length of the image-capturing optical lens is TTL, and the following relationship is satisfied:
1.18≤f3/f≤5.33；
0.02≤d5/TTL≤0.08。
7. the image-capturing optical lens unit according to claim 1, wherein the radius of curvature of the object-side surface of the fourth lens element is R7, the radius of curvature of the image-side surface of the fourth lens element is R8, the on-axis thickness of the fourth lens element is d7, the total optical length of the image-capturing optical lens unit is TTL, and the following relationships are satisfied:
-21.29≤(R7+R8)/(R7-R8)≤-0.71；
0.02≤d7/TTL≤0.06。
8. the image-capturing optical lens unit according to claim 1, wherein the fifth lens element has a focal length f5, a radius of curvature of an object-side surface of the fifth lens element is R9, a radius of curvature of an image-side surface of the fifth lens element is R10, an on-axis thickness of the fifth lens element is d9, an optical total length of the image-capturing optical lens unit is TTL, and the following relationship is satisfied:
-181.79≤f5/f≤22.58；
-21.86≤(R9+R10)/(R9-R10)≤70.33；
0.02≤d9/TTL≤0.06。
9. the image-capturing optical lens unit according to claim 1, wherein the sixth lens element has a focal length f6, a radius of curvature of an object-side surface of the sixth lens element is R11, a radius of curvature of an image-side surface of the sixth lens element is R12, an on-axis thickness of the sixth lens element is d11, and an optical total length TTL satisfies the following relationship:
f6/f≤91.36；
-377.45≤(R11+R12)/(R11-R12)≤112.46；
0.03≤d11/TTL≤0.08。
10. the image-capturing optical lens unit according to claim 1, wherein the curvature radius of the object-side surface of the seventh lens element is R13, the curvature radius of the image-side surface of the seventh lens element is R14, the on-axis thickness of the seventh lens element is d13, and the total optical length of the image-capturing optical lens unit is TTL, and the following relationships are satisfied:
-54.41≤(R13+R14)/(R13-R14)≤-6.24；
0.03≤d13/TTL≤0.10。
11. the image-capturing optical lens unit according to claim 1, wherein the eighth lens element has a focal length f8, a radius of curvature of an object-side surface of the eighth lens element is R15, a radius of curvature of an image-side surface of the eighth lens element is R16, an on-axis thickness of the eighth lens element is d15, and an optical total length TTL satisfies the following relationship:
-1.90≤f8/f≤-0.56；
-2.65≤(R15+R16)/(R15-R16)≤-0.43；
0.03≤d15/TTL≤0.13。
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