CN111061036B - Image pickup optical lens - Google Patents

Image pickup optical lens Download PDF

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Publication number
CN111061036B
CN111061036B CN201911283830.9A CN201911283830A CN111061036B CN 111061036 B CN111061036 B CN 111061036B CN 201911283830 A CN201911283830 A CN 201911283830A CN 111061036 B CN111061036 B CN 111061036B
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lens
image
lens element
curvature
ttl
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CN111061036A (en
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葛诗雨
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Chengrui Optics Changzhou Co Ltd
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Chengrui Optics 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

Abstract

The invention relates to the field of optical lenses, and discloses an image pickup optical lens, which sequentially comprises 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 positive refractive power, a fifth lens element with negative refractive power, a sixth lens element with positive refractive power, a seventh lens element with positive refractive power, and an eighth lens element with negative refractive power; the focal length of the imaging optical lens is f, the focal length of the fourth lens is f4, the abbe number of the first lens is v1, the abbe number of the second lens is v2, and the following relations are satisfied: v1/v2 is more than or equal to 2.90 and less than or equal to 4.00; f4/f is more than or equal to 2.00 and less than or equal to 6.00. 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
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
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 with a good function, a light weight, a small size and a light weight, 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, or even five-piece or six-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.
Disclosure of 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, an embodiment of 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 positive refractive power, a fifth lens element with negative refractive power, a sixth lens element with positive refractive power, a seventh lens element with positive refractive power, and an eighth lens element with negative refractive power;
the focal length of the image pickup optical lens is f, the focal length of the fourth lens is f4, the abbe number of the first lens is v1, the abbe number of the second lens is v2, and the following relations are satisfied: v1/v2 is more than or equal to 2.90 and less than or equal to 4.00; f4/f is more than or equal to 2.00 and less than or equal to 6.00.
Preferably, the radius of curvature of the object-side surface of the third lens is R5, the radius of curvature of the image-side surface of the third lens is R6, and the following relationship is satisfied: the ratio of (R5+ R6)/(R5-R6) is more than or equal to-20.00 and less than or equal to-3.00.
Preferably, the on-axis distance of the sixth lens is d11, the on-axis distance from the image-side surface of the sixth lens to the object-side surface of the seventh lens is d12, and the following relation is satisfied: d12/d11 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 curvature radius of the object-side surface of the first lens element is R1, the curvature radius of the image-side surface of the first lens element is R2, the on-axis thickness of the first lens element is d1, the total optical length of the image pickup optical lens is TTL, and the following relationships are satisfied: f1/f is more than or equal to 0.47 and less than or equal to 1.50; -4.83 ≤ (R1+ R2)/(R1-R2) ≤ 1.41; d1/TTL is more than or equal to 0.05 and less than or equal to 0.17.
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 not less than 7.35 and not more than-2.20; 1.29-4.74 of (R3+ R4)/(R3-R4); d3/TTL is more than or equal to 0.02 and less than or equal to 0.06.
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 2.69 and less than or equal to 39.68; d5/TTL is more than or equal to 0.02 and less than or equal to 0.06.
Preferably, a curvature radius of an object-side surface of the fourth lens element is R7, a curvature radius of an image-side surface of the fourth lens element is R8, an on-axis thickness of the fourth lens element is d7, and an optical total length of the imaging optical lens system is TTL and satisfies the following relationship: (R7+ R8)/(R7-R8) is not more than 0.26 and not more than 3.06; d7/TTL is more than or equal to 0.03 and less than or equal to 0.09.
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 image pickup optical lens is TTL, and the following relationships are satisfied: f5/f is not less than 6.40 and not more than-1.55; -7.70 ≤ (R9+ R10)/(R9-R10) 0.25; 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, the total optical length of the imaging optical lens system is TTL, and the following relationships are satisfied: f6/f is more than or equal to 1.92 and less than or equal to 8.20; -19.04 ≤ (R11+ R12)/(R11-R12) is ≤ 0.65; d11/TTL is more than or equal to 0.02 and less than or equal to 0.07.
Preferably, the focal length of the seventh lens element is f7, 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, the total optical length of the imaging optical lens system is TTL, and the following relationships are satisfied: f7/f is more than or equal to 1.36 and less than or equal to 10.73; -27.26 ≤ (R13+ R14)/(R13-R14) ≤ 2.76; d13/TTL is more than or equal to 0.04 and less than or equal to 0.16.
The invention has the beneficial effects that: the imaging optical lens according to the present invention has excellent optical characteristics, and has characteristics of a large aperture, a wide angle of view, and an ultra-thin profile, and is particularly suitable for a mobile phone camera lens module and a WEB camera lens which are constituted by high-pixel imaging elements such as CCDs and CMOSs.
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 of the present invention;
FIG. 2 is a schematic axial aberration diagram of the imaging optical lens of 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 of FIG. 1;
fig. 5 is a schematic configuration diagram of an imaging optical lens according to a second embodiment of the present invention;
FIG. 6 is a schematic axial aberration diagram of the imaging optical lens of 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 of FIG. 5;
fig. 9 is a schematic configuration diagram of an imaging optical lens according to a third embodiment of the present invention;
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.
Detailed Description
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 L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8. An optical element such as an optical filter (filter) GF may be disposed between the eighth lens L8 and the image plane Si.
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 positive refractive power, the fifth lens element L5 with negative refractive power, the sixth lens element L6 with positive refractive power, the seventh lens element L7 with positive refractive power, and the eighth lens element L8 with negative refractive power.
In the present embodiment, the abbe number of the first lens L1 is defined as v1, and the abbe number of the second lens L2 is defined as v2, and the following relations are satisfied: v1/v2 is more than or equal to 2.90 and less than or equal to 4.00, and the Abbe number ratio of the first lens and the second lens is regulated, so that the range is more favorable for the development of ultra-thinning and is favorable for correcting aberration. Preferably, 2.93 ≦ v1/v2 ≦ 3.98.
Defining the focal length f of the image pickup optical lens 10 and the focal length f4 of the fourth lens L4, the following relations are satisfied: f4/f is more than or equal to 2.00 and less than or equal to 6.00, the ratio of the focal length of the fourth lens to the total focal length is specified, and the system has better imaging quality and lower sensitivity through reasonable distribution of focal power. Preferably, 2.02. ltoreq. f 4/f. ltoreq.6.00 is satisfied.
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: -20.00 ≦ (R5+ R6)/(R5-R6) ≦ -3.00, and defines the shape of the third lens, and within the range defined by the conditional expression, the degree of deflection of the light rays passing through the lens can be alleviated, and the aberration can be effectively reduced. Preferably, it satisfies-19.98 ≦ (R5+ R6)/(R5-R6). ltoreq.3.03.
Defining the on-axis distance of the sixth lens L6 as d11, the on-axis distance from the image-side surface of the sixth lens L6 to the object-side surface of the seventh lens L7 as d12, the following relation is satisfied: d12/d11 is more than or equal to 2.00 and less than or equal to 4.00, the ratio of the air space between the sixth seventh lens and the thickness of the sixth lens is regulated, the total length of the optical system is favorably compressed within the range of the conditional expression, and the ultrathin effect is realized. Preferably, 2.01. ltoreq. d12/d 11. ltoreq.4.00 is satisfied.
Defining the focal length f of the image pickup optical lens 10 and the focal length f1 of the first lens, the following relations are satisfied: f1/f is more than or equal to 0.47 and less than or equal to 1.50, the ratio of the positive refractive power of the first lens element L1 to the overall focal length is specified, and when the ratio is within the specified range, the first lens element has appropriate positive refractive power, which is beneficial to reducing system aberration and is beneficial to the development of ultra-thinning and wide-angle lenses. Preferably, 0.75. ltoreq. f 1/f. ltoreq.1.20 is satisfied.
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: -4.83 ≦ (R1+ R2)/(R1-R2) ≦ -1.41, and the shape of the first lens L1 is appropriately controlled so that the first lens L1 can effectively correct the system spherical aberration, preferably, satisfying-3.02 ≦ (R1+ R2)/(R1-R2) ≦ -1.76.
The on-axis thickness of the first lens L1 is d1, the total optical length of the imaging optical lens system 10 is TTL, and the following relationship is satisfied: d1/TTL is more than or equal to 0.05 and less than or equal to 0.17, and ultra-thinning is facilitated in the condition formula range. Preferably, 0.08. ltoreq. d 1/TTL. ltoreq.0.14 is satisfied.
Defining the focal length f of the image pickup optical lens 10 and the focal length f2 of the second lens L2, the following relations are satisfied: 7.35 ≦ f2/f ≦ -2.20, which is advantageous for correcting aberrations of the optical system by controlling the negative power of the second lens L2 in a reasonable range. Preferably, it satisfies-4.60. ltoreq. f 2/f. ltoreq-2.75.
The curvature radius of the object side surface of the second lens L2 is R3, the curvature radius of the image side surface of the second lens L2 is R4, and the following relational expression is satisfied: the shape of the second lens L2 is defined to be not less than 1.29 (R3+ R4)/(R3-R4) and not more than 4.74, and the problem of chromatic aberration on the axis can be corrected favorably as the lens is made to have a super-thin wide angle within the range. Preferably, 2.06 ≦ (R3+ R4)/(R3-R4) ≦ 3.79 is satisfied.
The on-axis thickness of the second lens L2 is d3, the total optical length of the imaging optical lens system 10 is TTL, and the following relationship is satisfied: d3/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 3/TTL. ltoreq.0.05 is satisfied.
The focal length of the third lens L3 is defined as f3, and the following relation is satisfied: 2.69 < f3/f < 39.68, and the system has better imaging quality and lower sensitivity through reasonable distribution of focal power. Preferably, 4.31. ltoreq. f 3/f. ltoreq.31.74 is satisfied.
The on-axis thickness of the third lens L3 is d5, the total optical length of the imaging optical lens system 10 is TTL, and the following relationship is satisfied: d5/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 5/TTL. ltoreq.0.05 is satisfied.
The curvature radius of the object side surface of the fourth lens L4 is defined as R7, the curvature radius of the image side surface of the fourth lens L4 is defined as R8, and the following relations are satisfied: the (R7+ R8)/(R7-R8) is 0.26-3.06, and the shape of the fourth lens L4 is defined to be in the range, and the problem of aberration of the off-axis angle is favorably corrected with the development of an ultra-thin wide angle when the shape is in the range. Preferably, 0.41. ltoreq. (R7+ R8)/(R7-R8). ltoreq.2.45 is satisfied.
The on-axis thickness of the fourth lens L4 is d7, the total optical length of the imaging optical lens system 10 is TTL, and the following relationship is satisfied: d7/TTL is more than or equal to 0.03 and less than or equal to 0.09, and ultra-thinning is favorably realized within the range of conditional expressions. Preferably, 0.05. ltoreq. d 7/TTL. ltoreq.0.08 is satisfied.
Defining the focal length of the entire image pickup optical lens 10 as f and the focal length of the fifth lens L5 as f5, the following relationships are satisfied: f5/f is less than or equal to 6.40 and less than or equal to-1.55, and the definition of the fifth lens L5 can effectively make the light angle of the camera lens smooth and reduce the tolerance sensitivity. Preferably, it satisfies-4.00. ltoreq. f 5/f. ltoreq-1.94.
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: 7.70 ≦ (R9+ R10)/(R9-R10) ≦ 0.25, and the shape of the fifth lens L5 is specified, and when the conditions are within the range, it is advantageous to correct the aberration of the off-axis view angle and the like as the ultra-thin wide angle is developed. Preferably, it satisfies-4.82 ≦ (R9+ R10)/(R9-R10). ltoreq.0.20.
The on-axis thickness of the fifth lens L5 is d9, the total optical length of the imaging optical lens system 10 is TTL, and the following relationship 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 is satisfied.
Defining the focal length of the entire image pickup optical lens 10 as f and the focal length of the sixth lens L6 as f6, the following relationships are satisfied: f6/f is more than or equal to 1.92 and less than or equal to 8.20, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power. Preferably, 3.08. ltoreq. f 6/f. ltoreq.6.56 is satisfied.
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: -19.04 ≦ (R11+ R12)/(R11-R12) ≦ -0.65, and the shape of the sixth lens L6 is specified, and when the conditions are within the range, it is advantageous to correct the aberration of the off-axis view angle and the like as the ultra-thin wide angle is developed. Preferably, it satisfies-11.90 ≦ (R11+ R12)/(R11-R12) ≦ -0.81.
The on-axis thickness of the sixth lens element L6 is d11, the total optical length of the imaging optical lens system 10 is TTL, and the following relationships are satisfied: d11/TTL is more than or equal to 0.02 and less than or equal to 0.07, and ultra-thinning is favorably realized within the range of conditional expressions. Preferably, 0.03. ltoreq. d 11/TTL. ltoreq.0.06 is satisfied.
Defining the focal length of the entire image pickup optical lens 10 as f and the focal length of the seventh lens L7 as f7, the following relations are satisfied: 1.36 ≦ f7/f ≦ 10.73, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power. Preferably, 2.17. ltoreq. f 7/f. ltoreq.8.58 is satisfied.
The curvature radius of the object side surface of the seventh lens L7 is R13, the curvature radius of the image side surface of the seventh lens L7 is R14, and the following relational expression is satisfied: -27.26 ≦ (R13+ R14)/(R13-R14) ≦ -2.76, and the shape of the seventh lens L7 is specified, and when the conditions are within the range, it is advantageous to correct the aberration of the off-axis view angle and the like as the ultra-thin wide angle is developed. Preferably, it satisfies-17.04 ≦ (R13+ R14)/(R13-R14) ≦ -3.44.
The on-axis thickness of the seventh lens L7 is d13, the total optical length of the imaging optical lens system 10 is TTL, and the following relationship is satisfied: d13/TTL is more than or equal to 0.04 and less than or equal to 0.16, and ultra-thinning is facilitated in the condition formula range. Preferably, 0.06. ltoreq. d 13/TTL. ltoreq.0.13 is satisfied.
Defining the focal length f of the entire image pickup optical lens 10 and the focal length f8 of the eighth lens L8, the following relations are satisfied: 2.27 ≦ f8/f ≦ -0.57, allowing better imaging quality and lower sensitivity of the system through reasonable distribution of optical power. Preferably, it satisfies-1.42. ltoreq. f 8/f. ltoreq-0.71.
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: -0.18 ≦ (R15+ R16)/(R15-R16) ≦ 0.19, and the shape of the eighth lens L8 is specified, and when the conditions are within the range, it is advantageous to correct the aberration of the off-axis view angle and the like as the ultra-thin wide angle is developed. Preferably, it satisfies-0.11. ltoreq. (R15+ R16)/(R15-R16). ltoreq.0.15.
The on-axis thickness of the eighth lens element L8 is d15, the total optical length of the imaging optical lens system 10 is TTL, and the following relationships are satisfied: d15/TTL is more than or equal to 0.03 and less than or equal to 0.11, and ultra-thinning is favorably realized within the range of conditional expressions. Preferably, 0.05. ltoreq. d 15/TTL. ltoreq.0.09 is satisfied.
In the present embodiment, the image height of the entire imaging optical lens 10 is IH, and the following conditional expression is satisfied: TTL/IH is less than or equal to 1.10, thereby realizing ultra-thinning.
In the present embodiment, the number of apertures Fno of the imaging optical lens 10 is 1.96 or less. The large aperture is large, and the imaging performance is good.
In the present embodiment, the field angle FOV of the imaging optical lens 10 is 87 ° or more, thereby achieving a wide angle.
When the above relationship is satisfied, the imaging optical lens 10 has good optical performance, and can satisfy design requirements of large aperture, wide angle and ultra-thinness; in accordance with the characteristics of the optical lens 10, the optical lens 10 is particularly suitable for a mobile phone camera lens module and a WEB camera lens which are configured by image pickup devices such as a high-pixel CCD and 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: the total optical length (on-axis distance from the object side surface of the first lens L1 to the image plane) in units of 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 BDA0002317463150000101
Figure BDA0002317463150000111
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 image-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;
vd: 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;
vg: 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 BDA0002317463150000141
Wherein k is a conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18, A20 are aspheric coefficients.
IH: image height
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 1.845
P1R2 1 1.585
P2R1 0
P2R2 0
P3R1 2 0.835 1.255
P3R2 2 0.525 1.345
P4R1 1 1.695
P4R2 0
P5R1 0
P5R2 2 0.305 1.945
P6R1 2 0.805 2.795
P6R2 0
P7R1 2 1.055 3.545
P7R2 2 1.155 4.115
P8R1 2 2.685 6.055
P8R2 1 0.865
[ TABLE 4 ]
Figure BDA0002317463150000151
Figure BDA0002317463150000161
Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm, and 430nm passing through the imaging optical lens 10 according to the first embodiment. Fig. 4 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 10 according to the first embodiment, where S is curvature of field in the sagittal direction and T is curvature of field in the tangential direction in fig. 4.
Table 13 shown later shows values of various numerical values in examples 1, 2, and 3 corresponding to the parameters specified in the conditional expressions.
As shown in table 13, the first embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 3.799mm, a full field image height of 7.8mm, a diagonal field angle of 89.20 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
(second embodiment)
The second embodiment is basically the same as the first embodiment, the same reference numerals as in the first embodiment, and only different points 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 BDA0002317463150000171
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 BDA0002317463150000172
Figure BDA0002317463150000181
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 Position of reverse curve 4
P1R1 1 1.895
P1R2 1 1.655
P2R1 0
P2R2 0
P3R1 2 0.695 1.205
P3R2 2 0.635 1.225
P4R1 2 0.275 1.665
P4R2 0
P5R1 0
P5R2 3 0.395 1.835 2.405
P6R1 1 0.825
P6R2 1 0.615
P7R1 2 1.045 3.425
P7R2 2 1.105 3.945
P8R1 3 2.695 5.605 6.185
P8R2 4 0.785 5.655 5.905 6.615
[ TABLE 8 ]
Number of stagnation points Location of stagnation 1 Location of stagnation 2
P1R1 0
P1R2 0
P2R1 0
P2R2 0
P3R1 0
P3R2 0
P4R1 1 0.455
P4R2 0
P5R1 0
P5R2 1 0.655
P6R1 1 1.465
P6R2 1 1.355
P7R1 1 1.795
P7R2 1 1.795
P8R1 2 5.505 5.705
P8R2 1 1.495
Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm, and 430nm 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 555nm after passing through the imaging optical lens 20 according to the second embodiment.
As shown in table 13, the second embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 3.849mm, a full field height of 7.8mm, a diagonal field angle of 88.50 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
(third embodiment)
The third embodiment is basically the same as the first embodiment, the same reference numerals as in the first embodiment, and only different points 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 BDA0002317463150000191
Figure BDA0002317463150000201
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 BDA0002317463150000202
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 BDA0002317463150000203
Figure BDA0002317463150000211
[ TABLE 12 ]
Number of stagnation points Location of stagnation 1 Location of stagnation 2
P1R1 0
P1R2 0
P2R1 0
P2R2 0
P3R1 0
P3R2 2 0.945 1.505
P4R1 1 0.675
P4R2 0
P5R1 0
P5R2 0
P6R1 1 1.445
P6R2 1 1.765
P7R1 1 1.815
P7R2 1 1.855
P8R1 0
P8R2 1 1.715
Fig. 10 and 11 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, 470nm, and 430nm 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 555nm after passing through the imaging optical lens 30 according to the third embodiment.
Table 13 below shows the numerical values corresponding to the respective conditional expressions in the present embodiment, in accordance with the conditional expressions described above. Obviously, the imaging optical system of the present embodiment satisfies the above conditional expressions.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 3.872mm, a full field image height of 7.8mm, a diagonal field angle of 87.40 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
[ TABLE 13 ]
Figure BDA0002317463150000212
Figure BDA0002317463150000221
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 (10)

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 positive refractive power, a fifth lens element with negative refractive power, a sixth lens element with positive refractive power, a seventh lens element with positive refractive power, and an eighth lens element with negative refractive power;
the focal length of the imaging optical lens is f, the focal length of the fourth lens is f4, the abbe number of the first lens is v1, the abbe number of the second lens is v2, the radius of curvature of the object-side surface of the sixth lens is R11, the radius of curvature of the image-side surface of the sixth lens is R12, and the following relations are satisfied:
2.90≤v1/v2≤4.00；
2.00≤f4/f≤6.00；
-19.04≤(R11+R12)/(R11-R12)≤-0.65。
2. the imaging optical lens of claim 1, wherein the radius of curvature of the object-side surface of the third lens is R5, the radius of curvature of the image-side surface of the third lens is R6, and the following relationship is satisfied:
-20.00≤(R5+R6)/(R5-R6)≤-3.00。
3. the imaging optical lens according to claim 1, wherein an on-axis distance of the sixth lens is d11, an on-axis distance from an image-side surface of the sixth lens to an object-side surface of the seventh lens is d12, and the following relational expression is satisfied:
2.00≤d12/d11≤4.00。
4. the imaging optical lens of claim 1, wherein the first lens has a focal length of f1, a radius of curvature of an object-side surface of the first lens is R1, a radius of curvature of an image-side surface of the first lens is R2, an on-axis thickness of the first lens is d1, and an optical total length of the imaging optical lens is TTL, and the following relationship is satisfied:
0.47≤f1/f≤1.50；
-4.83≤(R1+R2)/(R1-R2)≤-1.41；
0.05≤d1/TTL≤0.17。
5. the image-capturing optical lens unit according to claim 1, wherein the second lens element has a focal length f2, a radius of curvature of an object-side surface of the second lens element is R3, a radius of curvature of an image-side surface of the second lens element is R4, an on-axis thickness of the second lens element is d3, and the image-capturing optical lens unit has a total optical length TTL satisfying the following relationship:
-7.35≤f2/f≤-2.20；
1.29≤(R3+R4)/(R3-R4)≤4.74；
0.02≤d3/TTL≤0.06。
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:
2.69≤f3/f≤39.68；
0.02≤d5/TTL≤0.06。
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:
0.26≤(R7+R8)/(R7-R8)≤3.06；
0.03≤d7/TTL≤0.09。
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:
-6.40≤f5/f≤-1.55；
-7.70≤(R9+R10)/(R9-R10)≤0.25；
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, an on-axis thickness d11, a total optical length TTL, and the following relationships are satisfied:
1.92≤f6/f≤8.20；
0.02≤d11/TTL≤0.07。
10. the image-taking optical lens according to claim 1, wherein the seventh lens element has a focal length f7, a radius of curvature of an object-side surface of the seventh lens element is R13, a radius of curvature of an image-side surface of the seventh lens element is R14, an on-axis thickness of the seventh lens element is d13, an optical total length of the image-taking optical lens is TTL, and the following relationship is satisfied:
1.36≤f7/f≤10.73；
-27.26≤(R13+R14)/(R13-R14)≤-2.76；
0.04≤d13/TTL≤0.16。
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