CN111025577B - Image pickup optical lens - Google Patents
Image pickup optical lens Download PDFInfo
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- CN111025577B CN111025577B CN201911370618.6A CN201911370618A CN111025577B CN 111025577 B CN111025577 B CN 111025577B CN 201911370618 A CN201911370618 A CN 201911370618A CN 111025577 B CN111025577 B CN 111025577B
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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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, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, and a seventh lens element, and satisfies the following relationships: FOV is more than or equal to 100.00 degrees and less than or equal to 135.00 degrees; f3/f is more than or equal to 2.00 and less than or equal to 20.00; R7/R8 is more than or equal to 1.00 and less than or equal to 20.00. The imaging optical lens can obtain high imaging performance and low TTL.
Description
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 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 a three-piece or four-piece lens structure. Moreover, with the development of technology and the increase of diversified demands of users, under the condition that the pixel area of the photosensitive device is continuously reduced and the requirement of the system on the imaging quality is continuously improved, the seven-piece lens structure gradually appears in the design of the lens. A wide-angle imaging lens having excellent optical characteristics, being ultra-thin and having sufficient chromatic aberration correction is in demand.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an imaging optical lens that can satisfy the requirements of ultra-thinning and wide angle while achieving high imaging performance.
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 negative refractive power, a second lens element with positive 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, and a seventh lens element;
the imaging optical lens has a maximum field angle FOV, a focal length f3, a radius of curvature R7, and a radius of curvature R8, and satisfies the following relationships: FOV is more than or equal to 100.00 degrees and less than or equal to 135.00 degrees; f3/f is more than or equal to 2.00 and less than or equal to 20.00; R7/R8 is more than or equal to 1.00 and less than or equal to 20.00.
Preferably, the image-side surface of the first lens is concave at the paraxial region; the focal length of the first lens is f1, the curvature radius of the object-side surface of the first lens is R1, the curvature radius of the image-side surface of the first lens is R2, the on-axis thickness of the first lens is d1, and the total optical length of the imaging optical lens is TTL and satisfies the following relational expression: f1/f is not less than 13.17 and not more than-1.20; not less than 0.28 (R1+ R2)/(R1-R2) not more than 14.98; d1/TTL is more than or equal to 0.02 and less than or equal to 0.10.
Preferably, the imaging optical lens satisfies the following relational expression: f1/f is more than or equal to-8.23 and less than or equal to-1.50; (R1+ R2)/(R1-R2) is not more than 0.45 and not more than 11.99; d1/TTL is more than or equal to 0.03 and less than or equal to 0.08.
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 0.37 and less than or equal to 6.38; -13.16 ≤ (R3+ R4)/(R3-R4) 1.52; d3/TTL is more than or equal to 0.04 and less than or equal to 0.29.
Preferably, the imaging optical lens satisfies the following relational expression: f2/f is more than or equal to 0.59 and less than or equal to 5.10; -8.23 ≤ (R3+ R4)/(R3-R4) 1.21; d3/TTL is more than or equal to 0.06 and less than or equal to 0.23.
Preferably, the object-side surface of the third lens is convex at the paraxial region; the curvature radius of the object-side surface of the third lens is R5, the curvature radius of the image-side surface of the third lens is R6, the on-axis thickness of the third lens is d5, and the total optical length of the photographic optical lens is TTL and satisfies the following relational expression: -8.97 ≤ (R5+ R6)/(R5-R6) 0.58; d5/TTL is more than or equal to 0.03 and less than or equal to 0.18.
Preferably, the imaging optical lens satisfies the following relational expression: -5.60 ≤ (R5+ R6)/(R5-R6) 0.46; d5/TTL is more than or equal to 0.05 and less than or equal to 0.14.
Preferably, the object-side surface of the fourth lens element is convex in the paraxial region, and the image-side surface thereof is concave in the paraxial region; the focal length of the fourth lens is f4, the on-axis thickness of the fourth lens is d7, the total optical length of the image pickup optical lens is TTL, and the following relational expression is satisfied: f4/f is not less than-1.38 and is not less than-126.83; (R7+ R8)/(R7-R8) is not more than 0.55 and not more than 39.72; d7/TTL is more than or equal to 0.02 and less than or equal to 0.08.
Preferably, the imaging optical lens satisfies the following relational expression: f4/f is not less than-1.72 and is not less than-79.27; not less than 0.88 (R7+ R8)/(R7-R8) not more than 31.78; d7/TTL is more than or equal to 0.03 and less than or equal to 0.06.
Preferably, the fifth lens element has a concave object-side surface and a convex image-side surface; 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, and the total optical length of the imaging optical lens assembly is TTL and satisfies the following relationship: -30.02 ≤ f5/f ≤ 1.41; -6.19 (R9+ R10)/(R9-R10) 3.60 or less; d9/TTL is more than or equal to 0.04 and less than or equal to 0.19.
Preferably, the imaging optical lens satisfies the following relational expression: 18.76 ≤ f5/f ≤ 1.13; -3.87 ≤ (R9+ R10)/(R9-R10) 2.88; d9/TTL is more than or equal to 0.06 and less than or equal to 0.15.
Preferably, the object-side surface of the sixth lens element is convex in the paraxial region; the focal length of the sixth lens element is f6, the curvature radius of the object-side surface of the sixth lens element is R11, the curvature radius 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 assembly is TTL and satisfies the following relation: -25.65. ltoreq. f 6/f. ltoreq.1.16; (R11+ R12)/(R11-R12) is not more than 0.41 and not more than 11.90; d11/TTL is more than or equal to 0.04 and less than or equal to 0.25.
Preferably, the imaging optical lens satisfies the following relational expression: -16.03. ltoreq. f 6/f. ltoreq.0.93; (R11+ R12)/(R11-R12) is not more than 0.66 and not more than 9.52; d11/TTL is more than or equal to 0.07 and less than or equal to 0.20.
Preferably, the seventh lens element has a convex object-side surface and a concave image-side surface; 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, and the total optical length of the imaging optical lens assembly is TTL and satisfies the following relationship: -2.02 ≤ f7/f ≤ 19.61; -114.33 (R13+ R14)/(R13-R14) is less than or equal to 3.64; d13/TTL is more than or equal to 0.03 and less than or equal to 0.13.
Preferably, the imaging optical lens satisfies the following relational expression: -1.26. ltoreq. f 7/f. ltoreq.15.69; -71.45 ≤ (R13+ R14)/(R13-R14) 2.91; d13/TTL is more than or equal to 0.05 and less than or equal to 0.11.
Preferably, the total optical length TTL of the image pickup optical lens is less than or equal to 7.10 millimeters.
Preferably, the total optical length TTL of the image pickup optical lens is less than or equal to 6.77 millimeters.
Preferably, the F-number of the imaging optical lens is less than or equal to 2.83.
Preferably, the F-number of the imaging optical lens is 2.78 or less.
The invention has the advantages that the optical camera lens has excellent optical characteristics, is ultrathin, has wide angle and can fully correct chromatic aberration, 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.
Drawings
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. Fig. 1 shows an image pickup optical lens according to a first embodiment of the present invention, which includes seven lenses. Specifically, the image pickup optical lens includes, in order from an object side to an image side: a first lens L1, a stop S1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. An optical element such as an optical filter (filter) GF may be disposed on the image side of the seventh lens element L7.
The first lens L1 is made of plastic, the second lens L2 is made of plastic, the third lens L3 is made of plastic, the fourth lens L4 is made of plastic, the fifth lens L5 is made of plastic, the sixth lens L6 is made of plastic, and the seventh lens L7 is made of plastic.
The maximum field angle of the camera optical lens is defined as FOV, the FOV is more than or equal to 100.00 degrees and less than or equal to 135.00 degrees, the field angle of the camera optical lens is defined, ultra-wide-angle camera shooting can be achieved within the range, and user experience is improved. Preferably, the FOV is 100.30 DEG.ltoreq. 134.94 deg.
The focal length of the image pickup optical lens is defined as f, the focal length of the third lens is defined as f3, and f3/f is more than or equal to 2.00 and less than or equal to 20.00. The positive refractive power of the third lens element L3 is specified. The ratio of the focal length of the third lens L3 to the overall focal length is specified. Within the specified range, the third lens element L3 has a positive refractive power, which is favorable for reducing system aberration and for advancing the lens toward ultra-thin and wide-angle. Preferably, 2.01. ltoreq. f 3/f. ltoreq.19.95 is satisfied.
The curvature radius of the object side surface of the fourth lens is defined as R7, the curvature radius of the image side surface of the fourth lens is defined as R8, and R7/R8 is greater than or equal to 1.00 and less than or equal to 20.00. The shape of the fourth lens L4 is defined, and when the lens is within the range, the problem of chromatic aberration on the axis can be corrected favorably as the lens becomes thinner and wider. Preferably, 1.04 ≦ R7/R8 ≦ 19.99.
When the focal length of the image pickup optical lens, the focal length of each lens, the refractive index of the relevant lens, the total optical length of the image pickup optical lens, the on-axis thickness and the curvature radius meet the relational expression, the image pickup optical lens can have high performance and meet the design requirement of low TTL.
In this embodiment, the image-side surface of the first lens element L1 is concave in the paraxial region and has negative refractive power.
The focal length of the whole shooting optical lens is f, the focal length of the first lens L1 is f1, and the following relational expression is satisfied: f1/f is less than or equal to-1.20, and the ratio of the focal length of the first lens L1 to the overall focal length is defined. Within the predetermined range, the first lens element L1 has a suitable negative refractive power, which is beneficial to reducing system aberration and is beneficial to the development of ultra-thin and wide-angle lenses. Preferably-8.23. ltoreq. f 1/f. ltoreq-1.50.
The curvature radius of the object side surface of the first lens L1 is R1, and the curvature radius of the image side surface of the first lens L1 is R2, so that the following relations are satisfied: 0.28 ≦ (R1+ R2)/(R1-R2) ≦ 14.98, and the shape of the first lens L1 is controlled appropriately so that the first lens L1 can effectively correct the system spherical aberration. Preferably, 0.45 ≦ (R1+ R2)/(R1-R2). ltoreq.11.99.
The on-axis thickness of the first lens L1 is d1, the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: d1/TTL is more than or equal to 0.02 and less than or equal to 0.10, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 1/TTL. ltoreq.0.08.
In this embodiment, the second lens element L2 has positive refractive power.
The focal length of the whole shooting optical lens is f, the focal length of the second lens L2 is f2, and the following relational expression is satisfied: f2/f is more than or equal to 0.37 and less than or equal to 6.38, and the positive focal power of the second lens L2 is controlled in a reasonable range, so that the aberration of the optical system can be corrected. Preferably, 0.59. ltoreq. f 2/f. ltoreq.5.10.
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, which satisfy the following relations: the shape of the second lens L2 is regulated to be not less than 13.16 (R3+ R4)/(R3-R4) and not more than 1.52, and the problem of chromatic aberration on the axis can be favorably corrected as the lens is changed to a super-thin wide angle within the range. Preferably, the ratio of-8.23 ≦ (R3+ R4)/(R3-R4) is ≦ 1.21.
The on-axis thickness of the second lens L2 is d3, the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: d3/TTL is more than or equal to 0.04 and less than or equal to 0.29, the ratio of the on-axis thickness of the second lens L2 to the total optical length TTL of the shooting optical lens is regulated, and ultra-thinning is facilitated. Preferably, 0.06. ltoreq. d 3/TTL. ltoreq.0.23.
In this embodiment, the object-side surface of the third lens element L3 is convex at the paraxial region and has positive refractive power.
The curvature radius of the object-side surface of the third lens L3 is R5, and the curvature radius of the image-side surface of the third lens L3 is R6, which satisfy the following relations: the (R5+ R6)/(R5-R6) is more than or equal to 8.97 and less than or equal to 0.58, the shape of the third lens L3 can be effectively controlled, the forming of the third lens L3 is facilitated, and the deflection degree of light rays passing through the lens can be alleviated within the range specified by the conditional expression, so that the aberration can be effectively reduced. Preferably, -5.60 ≦ (R5+ R6)/(R5-R6). ltoreq.0.46.
The on-axis thickness of the third lens L3 is d5, the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: d5/TTL is more than or equal to 0.03 and less than or equal to 0.18, and ultra-thinning is facilitated. Preferably, 0.05. ltoreq. d 5/TTL. ltoreq.0.14.
In this embodiment, the object-side surface of the fourth lens element L4 is convex at the paraxial region thereof, and the image-side surface thereof is concave at the paraxial region thereof, and has negative refractive power.
The focal length of the whole shooting optical lens is f, the focal length of the fourth lens L4 is f4, and the following relational expression is satisfied: -126.83 ≦ f4/f ≦ -1.38, allowing better imaging quality and lower sensitivity of the system through reasonable distribution of optical power. Preferably-79.27. ltoreq. f 4/f. ltoreq-1.72.
The curvature radius of the object-side surface of the fourth lens L4 is R7, and the curvature radius of the image-side surface of the fourth lens L4 is R8, which satisfy the following relations: the ratio of (R7+ R8)/(R7-R8) is 0.55 to 39.72, and the shape of the fourth lens L4 is defined so that the problem of aberration of the off-axis angle can be corrected with the development of an ultra-thin wide angle within the range. Preferably, 0.88 ≦ (R7+ R8)/(R7-R8). ltoreq.31.78.
The on-axis thickness of the fourth lens L4 is d7, the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: d7/TTL is more than or equal to 0.02 and less than or equal to 0.08, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 7/TTL. ltoreq.0.06.
In this embodiment, the object-side surface of the fifth lens element L5 is concave at the paraxial region, and the image-side surface thereof is convex at the paraxial region.
The focal length of the whole shooting optical lens is f, the focal length of the fifth lens L5 is f5, and the following relational expression is satisfied: 30.02 ≦ f5/f ≦ 1.41, and the definition of the fifth lens L5 can effectively make the light angle of the camera lens gentle and reduce tolerance sensitivity. Preferably-18.76. ltoreq. f 5/f. ltoreq.1.13.
The curvature radius of the object side surface of the fifth lens L5 is R9, and the curvature radius of the image side surface of the fifth lens L5 is R10, so that the following relations are satisfied: -6.19 ≦ (R9+ R10)/(R9-R10) ≦ 3.60, 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, -3.87 ≦ (R9+ R10)/(R9-R10). ltoreq.2.88.
The on-axis thickness of the fifth lens L5 is d9, the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: d9/TTL is more than or equal to 0.04 and less than or equal to 0.19, the ratio of the on-axis thickness of the fifth lens L5 to the total optical length TTL of the shooting optical lens is regulated, and ultra-thinning is facilitated. Preferably, 0.06. ltoreq. d 9/TTL. ltoreq.0.15.
In the present embodiment, the object-side surface of the sixth lens element L6 is convex at the paraxial region.
The focal length of the whole imaging optical lens is f, the focal length of the sixth lens L6 is f6, and the following relational expression is satisfied: 25.65 ≦ f6/f ≦ 1.16, which allows better imaging quality and lower sensitivity of the system by a reasonable distribution of the powers. Preferably-16.03. ltoreq. f 6/f. ltoreq.0.93.
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, which satisfy the following relations: the (R11+ R12)/(R11-R12) is not more than 0.41 and not more than 11.90, and the shape of the sixth lens L6 is defined, and when the shape is within the condition range, the problem of aberration of off-axis picture angle is favorably corrected along with the development of ultra-thin wide-angle. Preferably, 0.66 ≦ (R11+ R12)/(R11-R12). ltoreq.9.52.
The on-axis thickness of the sixth lens L6 is d11, the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: d11/TTL is more than or equal to 0.04 and less than or equal to 0.25, and ultra-thinning is facilitated. Preferably, 0.07. ltoreq. d 11/TTL. ltoreq.0.20.
In this embodiment, the object-side surface of the seventh lens element L7 is convex at the paraxial region, and the image-side surface thereof is concave at the paraxial region.
The focal length of the whole shooting optical lens is f, the focal length of the seventh lens L7 is f7, and the following relational expression is satisfied: 2.02 ≦ f7/f ≦ 19.61, which allows better imaging quality and lower sensitivity of the system by a reasonable distribution of the powers. Preferably, -1.26. ltoreq. f 7/f. ltoreq.15.69.
The curvature radius of the object-side surface of the seventh lens L7 is R13, and the curvature radius of the image-side surface of the seventh lens L7 is R14, which satisfy the following relations: -114.33 ≦ (R13+ R14)/(R13-R14) ≦ 3.64, and defines the shape of the seventh lens L7, which is advantageous for correcting the off-axis picture angle aberration and the like as the ultra-thin wide angle is advanced within the range. Preferably, -71.45 ≦ (R13+ R14)/(R13-R14) ≦ 2.91.
The on-axis thickness of the seventh lens L7 is d13, the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: d13/TTL is more than or equal to 0.03 and less than or equal to 0.13, and ultra-thinning is facilitated. Preferably, 0.05. ltoreq. d 13/TTL. ltoreq.0.11.
In this embodiment, the total optical length TTL of the image pickup optical lens is less than or equal to 7.10 mm, which is beneficial to achieving ultra-thinning. Preferably, the total optical length TTL of the image-taking optical lens is less than or equal to 6.77 millimeters.
In the present embodiment, the F-number of the imaging optical lens is 2.83 or less. The large aperture is large, and the imaging performance is good. Preferably, the F-number of the imaging optical lens is 2.78 or less.
With such a design, the total optical length TTL of the entire imaging optical lens can be made as short as possible, and the characteristic of miniaturization can be maintained.
The image pickup optical lens 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 1 st lens L1 to the image forming surface) 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 ]
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: radius of curvature of the object side of the optical filter GF;
r16: 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: the on-axis distance from the image-side surface of the seventh lens L7 to the object-side surface of the optical filter GF;
d 15: on-axis thickness of the optical filter GF;
d 16: 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;
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;
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 ]
Wherein k is a conic coefficient, and A4, A6, A8, A10, A12, A14 and A16 are aspheric coefficients.
y＝(x2/R)/[1+{1-(k+1)(x2/R2)}1/2]+A4x4+A6x6+A8x8+A10x10+A12x12+A14x14+A16x16 (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. 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, and P7R1 and P7R2 represent the object-side surface and the image-side surface of the seventh lens L7, 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 ]
[ TABLE 4 ]
| Number of stagnation points | Location of stagnation 1 | Location of stagnation 2 | |
| |
0 | ||
| |
0 | ||
| P2R1 | 1 | 0.775 | |
| |
0 | ||
| P3R1 | 1 | 0.425 | |
| P3R2 | 1 | 0.595 | |
| P4R1 | 2 | 0.205 | 0.805 |
| |
0 | ||
| P5R1 | 1 | 1.275 | |
| P5R2 | 1 | 1.545 | |
| P6R1 | 1 | 2.095 | |
| P6R2 | 1 | 1.735 | |
| P7R1 | 1 | 1.695 | |
| P7R2 | 1 | 2.545 |
Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 555nm, and 470nm, respectively, after 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 1.441mm, a full field image height of 3.25mm, a maximum field angle of 100.60 ° and is wide-angle and ultra-thin, 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 ]
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 ]
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 | |
| P1R1 | 1 | 0.695 | |
| P1R2 | 1 | 0.595 | |
| P2R1 | 1 | 0.265 | |
| |
0 | ||
| P3R1 | 2 | 0.655 | 1.165 |
| P3R2 | 1 | 0.605 | |
| P4R1 | 1 | 0.305 | |
| P4R2 | 1 | 1.255 | |
| P5R1 | 2 | 0.705 | 1.355 |
| P5R2 | 1 | 0.725 | |
| P6R1 | 1 | 0.235 | |
| P6R2 | 1 | 0.465 | |
| P7R1 | 1 | 0.615 | |
| P7R2 | 1 | 0.805 |
[ TABLE 8 ]
| Number of stagnation points | Location of stagnation 1 | |
| |
0 | |
| |
0 | |
| P2R1 | 1 | 0.395 |
| |
0 | |
| P3R1 | 1 | 1.015 |
| P3R2 | 1 | 0.925 |
| P4R1 | 1 | 0.595 |
| |
0 | |
| P5R1 | 1 | 1.155 |
| P5R2 | 1 | 1.295 |
| P6R1 | 1 | 0.395 |
| P6R2 | 1 | 1.035 |
| P7R1 | 1 | 1.135 |
| P7R2 | 1 | 1.545 |
Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 555nm, and 470nm, respectively, after 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 1.115mm, a full field image height of 3.25mm, a maximum field angle of 124.00 ° and is wide-angle and ultra-thin, 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.
The imaging optical lens assembly 30, in order from an object side to an image side, includes: a first lens L1, a second lens L2, a stop S1, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. An optical element such as an optical filter (filter) GF may be disposed on the image side of the seventh lens element L7.
The first lens L1 is made of plastic, the second lens L2 is made of plastic, the third lens L3 is made of glass, the fourth lens L4 is made of plastic, the fifth lens L5 is made of plastic, the sixth lens L6 is made of plastic, and the seventh lens L7 is made of plastic.
Tables 9 and 10 show design data of the imaging optical lens 30 according to the third embodiment of the present invention.
[ TABLE 9 ]
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 ]
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 ]
| Number of points of inflection | Position of reverse curvature 1 | Position of reverse curvature 2 | |
| P1R1 | 2 | 0.365 | 1.775 |
| |
0 | ||
| |
0 | ||
| |
0 | ||
| |
0 | ||
| |
0 | ||
| P4R1 | 1 | 0.225 | |
| P4R2 | 1 | 0.405 | |
| P5R1 | 2 | 0.405 | 1.045 |
| P5R2 | 1 | 1.215 | |
| P6R1 | 2 | 0.405 | 1.365 |
| P6R2 | 1 | 1.405 | |
| P7R1 | 2 | 0.425 | 1.685 |
| P7R2 | 2 | 0.605 | 2.575 |
[ TABLE 12 ]
| Number of stagnation points | Location of stagnation 1 | Location of stagnation 2 | |
| P1R1 | 1 | 0.665 | |
| |
0 | ||
| |
0 | ||
| |
0 | ||
| |
0 | ||
| |
0 | ||
| P4R1 | 1 | 0.405 | |
| P4R2 | 1 | 0.795 | |
| P5R1 | 2 | 0.745 | 1.205 |
| |
0 | ||
| P6R1 | 1 | 0.675 | |
| |
0 | ||
| P7R1 | 1 | 0.785 | |
| P7R2 | 1 | 1.615 |
Fig. 10 and 11 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 555nm, and 470nm, respectively, after 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 0.863mm, a full field image height of 3.25mm, a maximum field angle of 134.89 ° and is wide-angle and ultra-thin, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
[ TABLE 13 ]
| Parameter and condition formula | Example 1 | Example 2 | Example 3 |
| f | 3.574 | 3.065 | 2.158 |
| f1 | -23.543 | -8.718 | -3.888 |
| f2 | 3.731 | 2.265 | 9.179 |
| f3 | 71.128 | 13.174 | 4.344 |
| f4 | -11.045 | -6.326 | -136.861 |
| f5 | 2.817 | 2.884 | -32.395 |
| f6 | -45.849 | -2.316 | 1.673 |
| f7 | -3.238 | 40.073 | -2.181 |
| f12 | 4.476 | 2.979 | -6.656 |
| FNO | 2.48 | 2.75 | 2.50 |
| FOV | 100.60° | 124.00° | 134.89° |
| f3/f | 19.90 | 4.30 | 2.01 |
| R7/R8 | 19.97 | 10.01 | 1.08 |
F12 is the combined focal length of the first lens L1 and the second lens L2, and FNO is the number of apertures F 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 (19)
1. An imaging optical lens, comprising seven lens elements in order from an object side to an image side: a first lens element with negative refractive power, a second lens element with positive 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, and a seventh lens element;
the imaging optical lens has a maximum field angle FOV, a focal length f3, a focal length f4, a focal length f5, a radius of curvature of the object-side surface R5, a radius of curvature of the image-side surface R6, a radius of curvature of the object-side surface R7, and a radius of curvature of the image-side surface R8, and satisfies the following relationships:
100.00°≤FOV≤135.00°；
2.00≤f3/f≤20.00；
1.00≤R7/R8≤20.00；
-8.97≤(R5+R6)/(R5-R6)≤0.58；
-126.83≤f4/f≤-1.38；
-30.02≤f5/f≤1.41。
2. the imaging optical lens according to claim 1, wherein an image side surface of the first lens is concave in a paraxial direction;
the focal length of the first lens is f1, the curvature radius of the object-side surface of the first lens is R1, the curvature radius of the image-side surface of the first lens is R2, the on-axis thickness of the first lens is d1, and the total optical length of the imaging optical lens is TTL and satisfies the following relational expression:
-13.17≤f1/f≤-1.20；
0.28≤(R1+R2)/(R1-R2)≤14.98；
0.02≤d1/TTL≤0.10。
3. the imaging optical lens according to claim 2, wherein the imaging optical lens satisfies the following relationship:
-8.23≤f1/f≤-1.50；
0.45≤(R1+R2)/(R1-R2)≤11.99；
0.03≤d1/TTL≤0.08。
4. 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:
0.37≤f2/f≤6.38；
-13.16≤(R3+R4)/(R3-R4)≤1.52；
0.04≤d3/TTL≤0.29。
5. the imaging optical lens according to claim 4, wherein the imaging optical lens satisfies the following relation:
0.59≤f2/f≤5.10；
-8.23≤(R3+R4)/(R3-R4)≤1.21；
0.06≤d3/TTL≤0.23。
6. the imaging optical lens of claim 1, wherein the object-side surface of the third lens element is convex at the paraxial region;
the on-axis thickness of the third lens is d5, the total optical length of the photographic optical lens is TTL, and the following relational expression is satisfied:
0.03≤d5/TTL≤0.18。
7. the imaging optical lens according to claim 6, wherein the imaging optical lens satisfies the following relation:
-5.60≤(R5+R6)/(R5-R6)≤0.46；
0.05≤d5/TTL≤0.14。
8. the imaging optical lens of claim 1, wherein the fourth lens element has a convex object-side surface and a concave image-side surface;
the on-axis thickness of the fourth lens is d7, the total optical length of the image pickup optical lens is TTL, and the following relational expression is satisfied:
0.55≤(R7+R8)/(R7-R8)≤39.72；
0.02≤d7/TTL≤0.08。
9. the image-pickup optical lens according to claim 8, wherein the image-pickup optical lens satisfies the following relation:
-79.27≤f4/f≤-1.72；
0.88≤(R7+R8)/(R7-R8)≤31.78；
0.03≤d7/TTL≤0.06。
10. the imaging optical lens of claim 1, wherein the fifth lens element has a concave object-side surface and a convex image-side surface;
the curvature radius of the object-side surface of the fifth lens is R9, the curvature radius of the image-side surface of the fifth lens is R10, the on-axis thickness of the fifth lens is d9, and the total optical length of the photographic optical lens is TTL and satisfies the following relational expression:
-6.19≤(R9+R10)/(R9-R10)≤3.60；
0.04≤d9/TTL≤0.19。
11. the image-pickup optical lens according to claim 10, wherein the image-pickup optical lens satisfies the following relation:
-18.76≤f5/f≤1.13；
-3.87≤(R9+R10)/(R9-R10)≤2.88；
0.06≤d9/TTL≤0.15。
12. the imaging optical lens of claim 1, wherein the object-side surface of the sixth lens element is convex at the paraxial region;
the focal length of the sixth lens element is f6, the curvature radius of the object-side surface of the sixth lens element is R11, the curvature radius 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 assembly is TTL and satisfies the following relation:
-25.65≤f6/f≤1.16；
0.41≤(R11+R12)/(R11-R12)≤11.90；
0.04≤d11/TTL≤0.25。
13. the image-pickup optical lens according to claim 12, wherein the image-pickup optical lens satisfies the following relation:
-16.03≤f6/f≤0.93；
0.66≤(R11+R12)/(R11-R12)≤9.52；
0.07≤d11/TTL≤0.20。
14. the imaging optical lens of claim 1, wherein the seventh lens element has a convex object-side surface and a concave image-side surface;
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, and the total optical length of the imaging optical lens assembly is TTL and satisfies the following relationship:
-2.02≤f7/f≤19.61；
-114.33≤(R13+R14)/(R13-R14)≤3.64；
0.03≤d13/TTL≤0.13。
15. the image-pickup optical lens according to claim 14, wherein the image-pickup optical lens satisfies the following relation:
-1.26≤f7/f≤15.69；
-71.45≤(R13+R14)/(R13-R14)≤2.91；
0.05≤d13/TTL≤0.11。
16. a camera optical lens according to claim 1, characterized in that the total optical length TTL of the camera optical lens is less than or equal to 7.10 mm.
17. A camera optical lens according to claim 16, characterized in that the total optical length TTL of the camera optical lens is less than or equal to 6.77 mm.
18. A camera optical lens according to claim 1, characterized in that the F-number of the aperture of the camera optical lens is less than or equal to 2.83.
19. A camera optical lens according to claim 18, characterized in that the F-number of the aperture of the camera optical lens is less than or equal to 2.78.
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| CN109387925A (en) * | 2017-08-04 | 2019-02-26 | 先进光电科技股份有限公司 | Optical imaging system |
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| US20120250161A1 (en) * | 2011-03-30 | 2012-10-04 | Tetsuya Yanai | Zoom Lens and Image Pickup Apparatus Using the Same |
| CN108279472A (en) * | 2017-01-06 | 2018-07-13 | 先进光电科技股份有限公司 | Optical imaging system |
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