CN111007644A - Image pickup optical lens - Google Patents
Image pickup optical lens Download PDFInfo
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- CN111007644A CN111007644A CN201911369971.2A CN201911369971A CN111007644A CN 111007644 A CN111007644 A CN 111007644A CN 201911369971 A CN201911369971 A CN 201911369971A CN 111007644 A CN111007644 A CN 111007644A
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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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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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 negative 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, a sixth lens element and a seventh lens element; the focal length of the image pickup optical lens is f, the on-axis thickness of the first lens is d1, the on-axis thickness of the second lens is d3, the on-axis thickness of the third lens is d5, the on-axis thickness of the fifth lens is d9, 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, and the maximum field angle of the image pickup optical lens is FOV, which satisfy the following relational expression: FOV is more than or equal to 100.00 degrees and less than or equal to 135.00 degrees; (d1+ d5)/d3 is not more than 2.00 and not more than 4.00; (R5+ R6)/(R5-R6) is not more than 0.50 and not more than 10.00; d9/f is more than or equal to 0.05 and less than or equal to 0.20. 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, five-piece, six-piece and seven-piece lens structures gradually appear 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 negative refractive power, a third lens element with positive refractive power, a fourth lens element with positive refractive power, a fifth lens element, a sixth lens element and a seventh lens element;
the focal length of the imaging optical lens is f, the on-axis thickness of the first lens is d1, the on-axis thickness of the second lens is d3, the on-axis thickness of the third lens is d5, the on-axis thickness of the fifth lens is d9, 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, and the maximum field angle of the imaging optical lens is FOV, which satisfy the following relational expression: FOV is more than or equal to 100.00 degrees and less than or equal to 135.00 degrees; (d1+ d5)/d3 is not more than 2.00 and not more than 4.00; (R5+ R6)/(R5-R6) is not more than 0.50 and not more than 10.00; d9/f is more than or equal to 0.05 and less than or equal to 0.20.
Preferably, the object-side surface of the first lens element is convex in the paraxial region, and the image-side surface of the first lens element is concave in 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, and the total optical length of the imaging optical lens is TTL and satisfies the following relational expression: f1/f is not less than 6.08 and not more than-1.53; (R1+ R2)/(R1-R2) is not more than 0.50 and not more than 2.88; 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 relation: f1/f is not less than 3.80 and not more than-1.91; (R1+ R2)/(R1-R2) is not more than 0.80 and not more than 2.31; d1/TTL is more than or equal to 0.03 and less than or equal to 0.08.
Preferably, the image side surface of the second lens is concave at the paraxial region; the focal length of the second lens is f2, the curvature radius of the object-side surface of the second lens is R3, the curvature radius of the image-side surface of the second lens is R4, and the total optical length of the image pickup optical lens is TTL and satisfies the following relation: f2/f is not less than-115.56 and is not less than-673.53; (R3+ R4)/(R3-R4) is not more than 0.10 and not more than 110.04; d3/TTL is more than or equal to 0.02 and less than or equal to 0.07.
Preferably, the imaging optical lens satisfies the following relation: f2/f is not less than-144.44 and is not less than-420.96; (R3+ R4)/(R3-R4) is not more than 0.16 and not more than 88.03; d3/TTL is more than or equal to 0.03 and less than or equal to 0.05.
Preferably, the image-side surface of the third lens element is convex in the paraxial region; the focal length of the third lens is f3, the total optical length of the image pickup optical lens is TTL, and the following relational expression is satisfied: f3/f is more than or equal to 1.79 and less than or equal to 483.89; d5/TTL is more than or equal to 0.02 and less than or equal to 0.16.
Preferably, the imaging optical lens satisfies the following relation: f3/f is not less than 2.86 and not more than 387.11; d5/TTL is more than or equal to 0.03 and less than or equal to 0.13.
Preferably, the object-side surface of the fourth lens element is convex in the paraxial region, and the image-side surface of the fourth lens element is convex in the paraxial region; the focal length of the fourth lens is f4, the curvature radius of the object-side surface of the fourth lens is R7, the curvature radius of the image-side surface of the fourth lens is R8, the on-axis thickness of the fourth lens is d7, and the total optical length of the imaging optical lens is TTL and satisfies the following relation: f4/f is more than or equal to 0.37 and less than or equal to 1.27; -1.50 ≤ (R7+ R8)/(R7-R8) ≤ 0.25; d7/TTL is more than or equal to 0.05 and less than or equal to 0.19.
Preferably, the imaging optical lens satisfies the following relation: f4/f is more than or equal to 0.60 and less than or equal to 1.01; -0.94 ≤ (R7+ R8)/(R7-R8) ≤ 0.32; d7/TTL is more than or equal to 0.08 and less than or equal to 0.15.
Preferably, the object-side surface of the fifth lens element is concave in the paraxial region, and the image-side surface thereof is concave in the paraxial region; 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, and the total optical length of the image pickup optical lens system is TTL and satisfies the following relationship: f5/f is not less than 3.24 and not more than-0.88; -0.98 ≤ (R9+ R10)/(R9-R10) 0.98; d9/TTL is more than or equal to 0.02 and less than or equal to 0.13.
Preferably, the imaging optical lens satisfies the following relation: f5/f is not less than-2.03 and not more than-1.10; -0.61 ≤ (R9+ R10)/(R9-R10) 0.79; d9/TTL is more than or equal to 0.03 and less than or equal to 0.10.
Preferably, the object-side surface of the sixth lens element is convex in the paraxial region, and the image-side surface thereof 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: f6/f is more than or equal to 0.37 and less than or equal to 1.59; -1.10 ≤ (R11+ R12)/(R11-R12) 0.08; d11/TTL is more than or equal to 0.03 and less than or equal to 0.22.
Preferably, the imaging optical lens satisfies the following relation: f6/f is more than or equal to 0.59 and less than or equal to 1.27; -0.69 (R11+ R12)/(R11-R12) is 0.06 or less; d11/TTL is more than or equal to 0.05 and less than or equal to 0.18.
Preferably, the seventh lens object side surface is concave at the paraxial region; 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: f7/f is not less than 1.45 and not more than-0.45; -2.12 ≤ (R13+ R14)/(R13-R4) ≤ 0.45; d13/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 relation: f7/f is more than or equal to-0.91 and less than or equal to-0.56; -1.33 ≤ (R13+ R14)/(R13-R4) ≤ 0.57; d13/TTL is more than or equal to 0.04 and less than or equal to 0.07.
Preferably, the total optical length TTL of the image pickup optical lens is less than or equal to 8.36 millimeters.
Preferably, the total optical length TTL of the image pickup optical lens is less than or equal to 7.98 millimeters.
Preferably, the F-number of the imaging optical lens is less than or equal to 2.88.
Preferably, the F-number of the imaging optical lens is less than or equal to 2.83.
The invention has the beneficial effects that: the imaging optical lens according to the present invention has excellent optical characteristics, is extremely thin, has a wide angle, and sufficiently corrects chromatic aberration, and is particularly suitable for a mobile phone imaging lens unit and a WEB imaging lens which are configured by an imaging element such as a CCD or a CMOS for high pixel.
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 10. Fig. 1 shows an image pickup optical lens 10 according to a first embodiment of the present invention, and the image pickup optical lens 10 includes seven lenses. Specifically, the imaging optical lens 10, in order from an object side to an image side, includes: a first lens L1, a second lens L2, a third lens L3, a stop S1, 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 entire imaging optical lens 10 is defined as FOV, and the following relational expression is satisfied: 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 10 is defined, ultra-wide-angle camera shooting can be realized within the range, and the user experience is improved.
Defining the on-axis thickness of the first lens L1 as d1, the on-axis thickness of the second lens L2 as d3, and the on-axis thickness of the third lens L3 as d5, the following relations are satisfied: 2.00 is more than or equal to (d1+ d5)/d3 is more than or equal to 4.00, the ratio of the sum of the thicknesses of the first lens L1 and the third lens L3 on the axis to the thickness of the second lens L2 on the axis is defined, and the thicknesses of the first three lenses are reasonably controlled within the range, so that the processing of the lenses is facilitated, the product yield is improved, and the cost is reduced.
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: the (R5+ R6)/(R5-R6) is not more than 0.50 and not more than 10.00, the shape of the third lens L3 can be effectively controlled, the molding of the third lens L3 is facilitated, the deflection degree of light rays passing through the lens can be alleviated within the range specified by the conditional expression, and the aberration can be effectively reduced.
Defining the focal length f of the entire image pickup optical lens 10, and the on-axis thickness d9 of the fifth lens L5, the following relationships are satisfied: d9/f is more than or equal to 0.05 and less than or equal to 0.20, the ratio of the thickness of the fifth lens L5 on the axis to the overall focal length of the shooting optical lens 10 is defined, and the ratio is in the range, so that the aberration of the system can be corrected, and the imaging quality can be improved.
When the focal length of the image pickup optical lens 10, the focal lengths of the respective lenses, the refractive indices of the respective lenses, the optical total length of the image pickup optical lens, the on-axis thickness, and the curvature radius satisfy the above-described relational expressions, the image pickup optical lens 10 can have high performance and meet the design requirement of low TTL.
In this embodiment, the object-side surface of the first lens element L1 is convex in the paraxial region thereof and the image-side surface thereof is concave in the paraxial region thereof, and has negative refractive power.
The focal length of the entire image pickup optical lens 10 is f, and the focal length of the first lens L1 is f1, and the following relationships are satisfied: f1/f is 6.08-1.53, and the ratio of the focal length of the first lens L1 to the overall focal length is defined. When the first lens element is within the specified range, the first lens element has appropriate negative refractive power, which is beneficial to reducing system aberration and is beneficial to the development of ultra-thinning and wide-angle lens. Preferably, it satisfies-3.80. ltoreq. f 1/f. ltoreq-1.91.
The curvature radius R1 of the object side surface of the first lens L1 and the curvature radius R2 of the image side surface of the first lens L1 satisfy the following relations: 0.50 ≦ (R1+ R2)/(R1-R2) ≦ 2.88, and the shape of the first lens is reasonably controlled so that the first lens can effectively correct the system spherical aberration; preferably, 0.80 ≦ (R1+ R2)/(R1-R2). ltoreq.2.31.
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 image-side surface of the second lens element L2 is concave in the paraxial region and has negative refractive power.
The focal length of the entire image pickup optical lens 10 is f, and the focal length of the second lens L2 is f2, and the following relations are satisfied: f2/f 115.56 of 673.53 is smaller than or equal to-115.56, and the negative power of the second lens L2 is controlled within a reasonable range, so that the aberration of the optical system can be corrected. Preferably, -420.96. ltoreq. f 2/f. ltoreq-144.44.
The curvature radius R3 of the object side surface of the second lens L2 and the curvature radius R4 of the image side surface of the second lens L2 satisfy the following relations: the second lens L2 is defined in a shape of 0.10 ≦ (R3+ R4)/(R3-R4) ≦ 110.04, and is advantageous for correcting chromatic aberration on the axis as the lens is made to have a super-thin wide angle in the range. Preferably, 0.16 ≦ (R3+ R4)/(R3-R4). ltoreq. 88.03.
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 0.02 and less than or equal to 0.07, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 3/TTL. ltoreq.0.05.
In this embodiment, the image-side surface of the third lens element L3 is convex at the paraxial region and has positive refractive power.
The focal length of the entire image pickup optical lens 10 is f, the focal length of the third lens L3 is f3, and the following relationships are satisfied: 1.79-f 3/f-483.89, and the reasonable distribution of the focal power ensures that the system has better imaging quality and lower sensitivity. Preferably, 2.86. ltoreq. f 3/f. ltoreq. 387.11.
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 0.02 and less than or equal to 0.16, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 5/TTL. ltoreq.0.13.
In this embodiment, the object-side surface of the fourth lens element L4 is convex along the paraxial region thereof, and the image-side surface thereof is convex along the paraxial region thereof, and has positive refractive power.
The focal length of the entire image pickup optical lens 10 is f, and the focal length of the fourth lens L4 is f4, and the following relations are satisfied: f4/f is more than or equal to 0.37 and less than or equal to 1.27, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power. Preferably, 0.60. ltoreq. f 4/f. ltoreq.1.01.
The curvature radius R7 of the object side surface of the fourth lens L4 and the curvature radius R8 of the image side surface of the fourth lens L4 satisfy the following relations: -1.50 ≦ (R7+ R8)/(R7-R8) ≦ -0.25, and the shape of the fourth lens L4 is defined so that the problem of aberration of the off-axis angle is easily corrected with the development of an ultra-thin and wide-angle when the shape is within the range. Preferably, -0.94 ≦ (R7+ R8)/(R7-R8) ≦ -0.32.
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 0.05 and less than or equal to 0.19, and ultra-thinning is facilitated. Preferably, 0.08. ltoreq. d 7/TTL. ltoreq.0.15.
In the present embodiment, the object-side surface of the fifth lens element L5 is concave at the paraxial region, and the image-side surface is concave at the paraxial region.
The focal length of the entire image pickup optical lens 10 is f, and the focal length of the fifth lens L5 is f5, and the following relations are satisfied: f5/f is less than or equal to 3.24 and less than or equal to-0.88, 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, -2.03. ltoreq. f 5/f. ltoreq-1.10.
The curvature radius R9 of the object side surface of the fifth lens L5 and the curvature radius R10 of the image side surface of the fifth lens L5 satisfy the following relations: -0.98 ≦ (R9+ R10)/(R9-R10) ≦ 0.98, 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, -0.61 ≦ (R9+ R10)/(R9-R10) ≦ 0.79.
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 0.02 and less than or equal to 0.13, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 9/TTL. ltoreq.0.10.
In this embodiment, the object-side surface of the sixth lens element L6 is convex at the paraxial region, and the image-side surface thereof is convex at the paraxial region.
The focal length of the entire image pickup optical lens 10 is f, and the focal length of the sixth lens L6 is f6, and the following relationships are satisfied: f6/f is more than or equal to 0.37 and less than or equal to 1.59, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power. Preferably, 0.59. ltoreq. f 6/f. ltoreq.1.27.
The curvature radius R11 of the object side surface of the sixth lens L6 and the curvature radius R12 of the image side surface of the sixth lens L6 satisfy the following relations: (R11+ R12)/(R11-R12) is not more than 1.10 and not more than 0.08, and the shape of the sixth lens L6 is defined, and when the shape is within the condition range, the problem such as aberration of off-axis view angle is favorably corrected as the ultra-thin wide angle is developed. Preferably, -0.69 ≦ (R11+ R12)/(R11-R12). ltoreq.0.06.
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 0.03 and less than or equal to 0.22, and ultra-thinning is facilitated. Preferably, 0.05. ltoreq. d 11/TTL. ltoreq.0.18.
In the present embodiment, the object-side surface of the seventh lens element L7 is concave in the paraxial region.
The focal length of the entire image pickup optical lens 10 is f, and the focal length of the seventh lens L7 is f7, and the following relations are satisfied: -1.45 ≦ f7/f ≦ -0.45, allowing better imaging quality and lower sensitivity of the system through reasonable distribution of optical power. Preferably, -0.91. ltoreq. f 7/f. ltoreq-0.56.
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 relations are satisfied: the (R13+ R14)/(R13-R4) is not more than 2.12 and not more than-0.45, and the shape of the seventh lens L7 is defined so that the aberration of the off-axis view angle can be corrected as the angle becomes thinner and wider within the range. Preferably, -1.33 ≦ (R13+ R14)/(R13-R4) ≦ -0.57.
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 0.02 and less than or equal to 0.08, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 13/TTL. ltoreq.0.07.
In this embodiment, the total optical length TTL of the image pickup optical lens 10 is less than or equal to 8.36 mm, which is beneficial to achieving ultra-thinning. Preferably, the total optical length TTL of the image pickup optical lens 10 is less than or equal to 7.98 millimeters.
In the present embodiment, the number of apertures F of the imaging optical lens 10 is 2.88 or less. The large aperture is large, and the imaging performance is good. Preferably, the F-number of the imaging optical lens 10 is 2.83 or less.
With such a design, the total optical length TTL of the entire imaging optical lens 10 can be made as short as possible, and the characteristic of miniaturization can be maintained.
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 ]
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 ]
Where k is a conic coefficient, and a4, a6, A8, a10, a12, and a14 are aspheric coefficients.
IH: image height
y＝(x2/R)/[1+{1-(k+1)(x2/R2)}1/2]+A4x4+A6x6+A8x8+A10x10+A12x12+A14x14(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 ]
| Number of points of inflection | Position of |
Position of reverse curvature 2 | |
| |
1 | 0.345 | |
| |
0 | ||
| |
1 | 1.115 | |
| |
1 | 0.515 | |
| |
1 | 0.315 | |
| |
0 | ||
| |
1 | 1.055 | |
| |
0 | ||
| |
1 | 0.805 | |
| |
0 | ||
| |
1 | 1.445 | |
| |
1 | 1.175 | |
| |
1 | 1.915 | |
| P7R2 | 2 | 2.475 | 3.105 |
[ TABLE 4 ]
| Number of stagnation points | Location of |
Location of stagnation 2 | |
| |
1 | 0.605 | |
| |
0 | ||
| |
0 | ||
| |
1 | 0.885 | |
| |
1 | 0.515 | |
| |
0 | ||
| |
0 | ||
| |
0 | ||
| |
1 | 1.415 | |
| |
0 | ||
| |
0 | ||
| P6R2 | 2 | 1.665 | 1.915 |
| |
0 | ||
| |
0 |
Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 656nm, 588nm, and 486nm, 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 588nm 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 2.060mm, a full field image height of 5.29mm, a maximum field angle of 100.00 °, a wide angle, and a high profile, and has excellent optical characteristics with a sufficiently corrected on-axis and off-axis chromatic aberration.
(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 |
Position of reverse curvature 2 | Position of reverse curvature 3 | |
| |
0 | |||
| |
0 | |||
| P2R1 | 2 | 0.035 | 0.425 | |
| |
0 | |||
| |
1 | 0.115 | ||
| |
0 | |||
| |
1 | 0.745 | ||
| |
0 | |||
| P5R1 | 2 | 0.835 | 1.115 | |
| |
1 | 1.145 | ||
| |
1 | 0.815 | ||
| |
1 | 1.405 | ||
| P7R1 | 2 | 1.165 | 1.455 | |
| P7R2 | 3 | 0.285 | 1.145 | 1.695 |
[ TABLE 8 ]
| Number of stagnation points | Location of |
Location of stagnation 2 | |
| |
0 | ||
| |
0 | ||
| P2R1 | 2 | 0.055 | 0.545 |
| |
0 | ||
| |
1 | 0.185 | |
| |
0 | ||
| |
0 | ||
| |
0 | ||
| |
0 | ||
| |
0 | ||
| |
1 | 1.265 | |
| |
0 | ||
| |
0 | ||
| |
1 | 0.515 |
Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 656nm, 588nm, and 486nm, 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 588nm 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 1.061mm, a full field image height of 2.69mm, a maximum field angle of 134.51 ° and is wide-angle and ultra-thin, and has excellent optical characteristics with its 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 ]
Table 10 shows aspherical surface data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention. The object side surface of the first lens is a spherical surface.
[ 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 |
Position of reverse curvature 2 | |
| |
0 | ||
| |
1 | 0.845 | |
| |
1 | 0.855 | |
| |
0 | ||
| P3R1 | 2 | 0.055 | 0.725 |
| |
0 | ||
| |
1 | 0.695 | |
| |
0 | ||
| P5R1 | 2 | 0.845 | 1.085 |
| |
1 | 1.085 | |
| |
1 | 0.665 | |
| |
1 | 1.315 | |
| |
1 | 1.255 | |
| P7R2 | 2 | 0.325 | 1.535 |
[ TABLE 12 ]
| Number of stagnation points | Location of |
|
| |
0 | |
| |
0 | |
| |
1 | 1.085 |
| |
0 | |
| |
1 | 0.095 |
| |
0 | |
| |
0 | |
| |
0 | |
| |
0 | |
| |
0 | |
| |
1 | 1.095 |
| |
0 | |
| |
0 | |
| |
1 | 0.575 |
Fig. 10 and 11 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 656nm, 588nm, and 486nm 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 588nm 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 1.107mm, a full field image height of 3.39mm, a maximum field angle of 120.00 °, a wide angle, and a high profile, 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 | 5.769 | 2.969 | 3.100 |
| f1 | -17.532 | -7.944 | -7.110 |
| f2 | -999.998 | -999.995 | -999.994 |
| f3 | 20.638 | 378.000 | 999.996 |
| f4 | 4.529 | 2.507 | 2.310 |
| f5 | -7.583 | -4.811 | -4.981 |
| f6 | 6.128 | 2.172 | 2.407 |
| f7 | -4.179 | -2.069 | -2.071 |
| f12 | -17.000 | -7.876 | -7.058 |
| FNO | 2.80 | 2.80 | 2.80 |
| FOV | 100.00 | 134.51 | 120.00 |
| (d1+d5)/d3 | 2.00 | 3.99 | 3.00 |
| (R5+R6)/(R5-R6) | 0.51 | 9.90 | 5.25 |
| d9/f | 0.05 | 0.20 | 0.10 |
FNO is the F-number of the stop of the image pickup optical lens, and F12 is the combined focal length of the first lens and the second 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, in order from an object side to an image side, comprising: a first lens element with negative 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, a sixth lens element and a seventh lens element;
the focal length of the imaging optical lens is f, the on-axis thickness of the first lens is d1, the on-axis thickness of the second lens is d3, the on-axis thickness of the third lens is d5, the on-axis thickness of the fifth lens is d9, 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, and the maximum field angle of the imaging optical lens is FOV, which satisfy the following relational expression:
100.00°≤FOV≤135.00°；
2.00≤(d1+d5)/d3≤4.00；
0.50≤(R5+R6)/(R5-R6)≤10.00；
0.05≤d9/f≤0.20。
2. the imaging optical lens assembly of claim 1, wherein the first lens element has a convex object-side surface and a concave image-side surface;
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, and the total optical length of the imaging optical lens is TTL and satisfies the following relational expression:
-6.08≤f1/f≤-1.53；
0.50≤(R1+R2)/(R1-R2)≤2.88；
0.02≤d1/TTL≤0.10。
3. the imaging optical lens according to claim 2, wherein the imaging optical lens satisfies the following relationship:
-3.80≤f1/f≤-1.91；
0.80≤(R1+R2)/(R1-R2)≤2.31；
0.03≤d1/TTL≤0.08。
4. the imaging optical lens of claim 1, wherein the second lens image side surface is concave at the paraxial region;
the focal length of the second lens is f2, the curvature radius of the object-side surface of the second lens is R3, the curvature radius of the image-side surface of the second lens is R4, and the total optical length of the image pickup optical lens is TTL and satisfies the following relation:
-673.53≤f2/f≤-115.56；
0.10≤(R3+R4)/(R3-R4)≤110.04；
0.02≤d3/TTL≤0.07。
5. the imaging optical lens according to claim 4, wherein the imaging optical lens satisfies the following relation:
-420.96≤f2/f≤-144.44；
0.16≤(R3+R4)/(R3-R4)≤88.03；
0.03≤d3/TTL≤0.05。
6. the imaging optical lens of claim 1, wherein the third lens image-side surface is convex at the paraxial region;
the focal length of the third lens is f3, the total optical length of the image pickup optical lens is TTL, and the following relational expression is satisfied:
1.79≤f3/f≤483.89；
0.02≤d5/TTL≤0.16。
7. the imaging optical lens according to claim 6, wherein the imaging optical lens satisfies the following relation:
2.86≤f3/f≤387.11；
0.03≤d5/TTL≤0.13。
8. the imaging optical lens assembly of claim 1, wherein the fourth lens element has a convex object-side surface and a convex image-side surface;
the focal length of the fourth lens is f4, the curvature radius of the object-side surface of the fourth lens is R7, the curvature radius of the image-side surface of the fourth lens is R8, the on-axis thickness of the fourth lens is d7, and the total optical length of the imaging optical lens is TTL and satisfies the following relation:
0.37≤f4/f≤1.27；
-1.50≤(R7+R8)/(R7-R8)≤-0.25；
0.05≤d7/TTL≤0.19。
9. the image-pickup optical lens according to claim 8, wherein the image-pickup optical lens satisfies the following relation:
0.60≤f4/f≤1.01；
-0.94≤(R7+R8)/(R7-R8)≤-0.32；
0.08≤d7/TTL≤0.15。
10. the imaging optical lens of claim 1, wherein the fifth lens element has a concave object-side surface and a concave 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, and the total optical length of the image pickup optical lens system is TTL and satisfies the following relationship:
-3.24≤f5/f≤-0.88；
-0.98≤(R9+R10)/(R9-R10)≤0.98；
0.02≤d9/TTL≤0.13。
11. the image-pickup optical lens according to claim 10, wherein the image-pickup optical lens satisfies the following relation:
-2.03≤f5/f≤-1.10；
-0.61≤(R9+R10)/(R9-R10)≤0.79；
0.03≤d9/TTL≤0.10。
12. the imaging optical lens assembly according to claim 1, wherein the sixth lens element has a convex object-side surface and a convex image-side surface;
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:
0.37≤f6/f≤1.59；
-1.10≤(R11+R12)/(R11-R12)≤0.08；
0.03≤d11/TTL≤0.22。
13. the image-pickup optical lens according to claim 12, wherein the image-pickup optical lens satisfies the following relation:
0.59≤f6/f≤1.27；
-0.69≤(R11+R12)/(R11-R12)≤0.06；
0.05≤d11/TTL≤0.18。
14. the image-capturing optical lens of claim 1, wherein the seventh lens object-side surface is concave at a paraxial region;
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:
-1.45≤f7/f≤-0.45；
-2.12≤(R13+R14)/(R13-R4)≤-0.45；
0.02≤d13/TTL≤0.08。
15. the image-pickup optical lens according to claim 14, wherein the image-pickup optical lens satisfies the following relation:
-0.91≤f7/f≤-0.56；
-1.33≤(R13+R14)/(R13-R4)≤-0.57；
0.04≤d13/TTL≤0.07。
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 8.36 mm.
17. A camera optical lens according to claim 17, characterized in that the total optical length TTL of the camera optical lens is less than or equal to 7.98 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 2.88.
19. A camera optical lens according to claim 19, characterized in that the F-number of the aperture of the camera optical lens is less than or equal to 2.83.
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| CN106199922A (en) * | 2016-07-13 | 2016-12-07 | 浙江舜宇光学有限公司 | Seven chip wide-angle lens |
| CN108427172A (en) * | 2017-02-14 | 2018-08-21 | 先进光电科技股份有限公司 | Optical imaging system |
| CN109270662A (en) * | 2018-11-27 | 2019-01-25 | 浙江舜宇光学有限公司 | Optical imaging lens |
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| JP2016194653A (en) * | 2015-04-01 | 2016-11-17 | 日精テクノロジー株式会社 | Imaging optical system and imaging device having the same |
| CN106199922A (en) * | 2016-07-13 | 2016-12-07 | 浙江舜宇光学有限公司 | Seven chip wide-angle lens |
| CN108427172A (en) * | 2017-02-14 | 2018-08-21 | 先进光电科技股份有限公司 | Optical imaging system |
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