CN111025549A - Image pickup optical lens - Google Patents
Image pickup optical lens Download PDFInfo
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- CN111025549A CN111025549A CN201911335970.6A CN201911335970A CN111025549A CN 111025549 A CN111025549 A CN 111025549A CN 201911335970 A CN201911335970 A CN 201911335970A CN 111025549 A CN111025549 A CN 111025549A
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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 with positive refractive power, a second lens element with negative refractive power, a third lens element with positive refractive power, a fourth lens element with negative refractive power, a fifth lens element with positive refractive power, and a sixth lens element with negative refractive power; the following relation is satisfied: v1/v2 is more than or equal to 2.80 and less than or equal to 4.30; f2/f is more than or equal to minus 8.00 and less than or equal to minus 3.00; 2.50-15.00 (R7+ R8)/(R7-R8); d1/d2 is more than or equal to 2.50 and less than or equal to 6.00. The camera optical lens provided by the invention has good optical performance, and meets the design requirements of large aperture, wide angle and ultra-thinness.
Description
[ technical field ] A method for producing a semiconductor device
The present invention relates to the field of optical lenses, and more particularly, to an imaging optical lens suitable for portable terminal devices such as smart phones and digital cameras, and imaging apparatuses such as monitors and PC lenses.
[ background of the invention ]
In recent years, with the rise of smart phones, the demand of miniaturized camera lenses is increasing, and the photosensitive devices of general camera lenses are not limited to two types, namely, a Charge Coupled Device (CCD) or a Complementary Metal-oxide semiconductor (CMOS) Sensor, and due to the advanced semiconductor manufacturing process technology, the pixel size of the photosensitive devices is reduced, and in addition, the current electronic products are developed with a good function, a light weight, a small size and a light weight, so that the miniaturized camera lenses with good imaging quality are the mainstream in the current market.
In order to obtain better imaging quality, the lens mounted on the mobile phone camera conventionally adopts a three-piece, four-piece or five-piece lens structure. However, with the development of technology and the increasing demand of diversified users, under the condition that the pixel area of the photosensitive device is continuously reduced and the requirement of the system for the imaging quality is continuously improved, a six-piece lens structure gradually appears in the lens design, although the common six-piece lens has good optical performance, the focal power, the lens pitch and the lens shape setting still have certain irrationality, so that the design requirements of large aperture, ultra-thinning and wide-angle cannot be met while the lens structure has good optical performance.
[ summary of the invention ]
In view of the above problems, an object of the present invention is to provide an imaging optical lens that has good optical performance and satisfies design requirements for a large aperture, ultra-thin thickness, and wide angle.
To solve the above-mentioned problems, an embodiment of the present invention provides an imaging optical lens, in order from an object side to an image side: a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with positive refractive power, a fourth lens element with negative refractive power, a fifth lens element with positive refractive power, and a sixth lens element with negative refractive power;
the abbe number of the first lens is v1, the abbe number of the second lens is v2, the focal length of the imaging optical lens is f, the focal length of the second lens is f2, 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 first lens is d1, and the on-axis distance from the image-side surface of the first lens to the object-side surface of the second lens is d2, so that the following relational expressions are satisfied:
2.80≤v1/v2≤4.30；
-8.00≤f2/f≤-3.00；
2.50≤(R7+R8)/(R7-R8)≤15.00；
2.50≤d1/d2≤6.00。
preferably, the focal length of the third lens is f3, the focal length of the fifth lens is f5, and the following relation is satisfied:
6.00≤f3/f5≤12.00。
preferably, the focal length of the first lens element is f1, the curvature radius of the object-side surface of the first lens element is R1, the curvature radius of the image-side surface of the first lens element is R2, the on-axis thickness of the first lens element is d1, and the total optical length of the imaging optical lens system is TTL and satisfies the following relationships:
0.48≤f1/f≤1.63；
-4.13≤(R1+R2)/(R1-R2)≤-1.24；
0.05≤d1/TTL≤0.18。
preferably, 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, and the total optical length of the imaging optical lens system is TTL and satisfies the following relationship:
0.46≤(R3+R4)/(R3-R4)≤9.19；
0.02≤d3/TTL≤0.07。
preferably, the focal length of the third lens element is f3, the radius of curvature of the object-side surface of the third lens element is R5, the radius of curvature of the image-side surface of the third lens element is R6, the on-axis thickness of the third lens element is d5, and the total optical length of the imaging optical lens system is TTL and satisfies the following relationships:
5.32≤f3/f≤38.40；
-7.45≤(R5+R6)/(R5-R6)≤7.01；
0.03≤d5/TTL≤0.11。
preferably, the focal length of the fourth lens element is f4, the on-axis thickness of the fourth lens element is d7, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:
-74.71≤f4/f≤-4.93；
0.03≤d7/TTL≤0.08。
preferably, the focal length of the fifth lens element is f5, the curvature radius of the object-side surface of the fifth lens element is R9, the curvature radius of the image-side surface of the fifth lens element is R10, the on-axis thickness of the fifth lens element is d9, the total optical length of the imaging optical lens assembly is TTL, and the following relationships are satisfied:
0.81≤f5/f≤3.20；
-0.08≤(R9+R10)/(R9-R10)≤0.48；
0.04≤d9/TTL≤0.14。
preferably, the focal length of the sixth lens element is f6, the radius of curvature of the object-side surface of the sixth lens element is R11, the radius of curvature of the image-side surface of the sixth lens element is R12, the on-axis thickness of the sixth lens element is d11, and the total optical length of the imaging optical lens system is TTL and satisfies the following relationships:
-2.73≤f6/f≤-0.82；
1.34≤(R11+R12)/(R11-R12)≤4.24；
0.07≤d11/TTL≤0.22。
preferably, the total optical length of the image pickup optical lens is TTL, the image height of the image pickup optical lens is IH, and the following relation is satisfied:
TTL/IH<1.30。
preferably, the combined focal length of the first lens and the second lens is f12, and the following relation is satisfied:
0.60≤f12/f≤1.99。
the invention has the advantages that the camera optical lens has good optical performance, has the characteristics of large aperture, wide angle and ultra-thin, and is particularly suitable for mobile phone camera lens components and WEB camera lenses which are composed of high-pixel CCD, CMOS and other camera elements.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
fig. 1 is a schematic configuration diagram of an imaging optical lens according to a first embodiment;
fig. 2 is a schematic view of axial aberrations of the image-taking optical lens shown in fig. 1;
fig. 3 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 1;
FIG. 4 is a schematic view of curvature of field and distortion of the imaging optical lens shown in FIG. 1;
fig. 5 is a schematic configuration diagram of an imaging optical lens according to a second embodiment;
fig. 6 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 5;
fig. 7 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 5;
FIG. 8 is a schematic view of curvature of field and distortion of the imaging optical lens shown in FIG. 5;
fig. 9 is a schematic configuration diagram of an imaging optical lens according to a third embodiment;
fig. 10 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 9;
fig. 11 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 9;
fig. 12 is a schematic view of curvature of field and distortion of the imaging optical lens shown in fig. 9;
fig. 13 is a schematic configuration diagram of an imaging optical lens according to a fourth embodiment;
fig. 14 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 13;
fig. 15 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 13;
fig. 16 is a schematic view of curvature of field and distortion of the imaging optical lens shown in fig. 13.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present invention in its various embodiments. However, the technical solution claimed in the present invention can be implemented without these technical details and various changes and modifications based on the following embodiments.
(first embodiment)
Referring to the drawings, the present invention provides an image pickup optical lens 10. Fig. 1 shows an imaging optical lens 10 according to a first embodiment of the present invention, and the imaging optical lens 10 includes six lenses. Specifically, the imaging optical lens 10, in order from an object side to an image side, includes: the stop S1, the first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, the fifth lens element L5 with positive refractive power, and the sixth lens element L6 with negative refractive power. An optical element such as an optical filter (filter) GF may be disposed between the sixth lens L6 and the image plane Si.
In the present embodiment, the abbe number of the first lens L1 is defined as v1, the abbe number of the second lens L2 is defined as v2, and the following relation is satisfied: v1/v2 is more than or equal to 2.80 and less than or equal to 4.30; the abbe number ratio of the first lens L1 and the second lens L2 is defined, and in this range, it is more advantageous to reduce the thickness and correct aberrations. Preferably, 2.84. ltoreq. v1/v 2. ltoreq.4.25 is satisfied.
The focal length of the image pickup optical lens is f, the focal length of the second lens L2 is f2, and the following relation is satisfied: f2/f is more than or equal to minus 8.00 and less than or equal to minus 3.00; the ratio of the focal length of the second lens L2 to the total focal length of the system is specified, which can effectively balance the spherical aberration and the field curvature of the system. Preferably, f 2/f.ltoreq.3.02 is satisfied at-7.98. ltoreq.f.
The curvature radius of the object side surface of the fourth lens L4 is R7, the curvature radius of the image side surface of the fourth lens L4 is R8, and the following relations are satisfied: 2.50-15.00 (R7+ R8)/(R7-R8); the shape of the fourth lens L4 is defined, and the degree of deflection of the light passing through the lens can be alleviated within the range defined by the conditional expression, so that the aberration can be effectively reduced. Preferably, 2.50 ≦ (R7+ R8)/(R7-R8) ≦ 14.97 is satisfied.
The on-axis thickness of the first lens L1 is d1, the on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2 is d2, and the following relation is satisfied: d1/d2 is more than or equal to 2.50 and less than or equal to 6.00; the ratio of the thickness of the first lens L1 to the air space between the first lens L1 and the second lens L2 is defined, and the total length of the optical system can be reduced in a conditional expression range, so that the ultrathin effect can be realized. Preferably, 2.50. ltoreq. d1/d 2. ltoreq.5.98.
Defining a focal length of the third lens L3 as f3, a focal length of the fifth lens L5 as f5, and satisfying the following relation: f3/f5 is more than or equal to 6.00 and less than or equal to 12.00; the ratio of the focal lengths of the third lens L3 and the fifth lens L5 is specified, and the system has better imaging quality and lower sensitivity through reasonable distribution of the optical power. Preferably, it satisfies 6.02. ltoreq. f3/f 5. ltoreq.11.96.
Defining the focal length of the first lens L1 as f1, the following relation is satisfied: f1/f is more than or equal to 0.48 and less than or equal to 1.63; the ratio of the focal length of the first lens L1 to the total focal length of the system is specified, which can effectively balance the spherical aberration and the field curvature of the system. Preferably, 0.78. ltoreq. f 1/f. ltoreq.1.31 is satisfied.
The curvature radius of the object side surface of the first lens L1 is R1, the curvature radius of the image side surface of the first lens L1 is R2, and the following relational expression is satisfied: 4.13 is less than or equal to (R1+ R2)/(R1-R2) is less than or equal to-1.24; the shape of the first lens L1 is appropriately controlled so that the first lens L1 can effectively correct the system spherical aberration. Preferably, it satisfies-2.58 ≦ (R1+ R2)/(R1-R2). ltoreq.1.55.
The on-axis thickness of the first lens L1 is d1, the total optical length of the image pickup optical lens is TTL, and the following relational expression is satisfied: d1/TTL is more than or equal to 0.05 and less than or equal to 0.18, and ultra-thinning is facilitated. Preferably, 0.09. ltoreq. d 1/TTL. ltoreq.0.15 is satisfied.
The curvature radius of the object side surface of the second lens L2 is defined as R3, the curvature radius of the image side surface of the second lens L2 is defined as R4, and the following relational expressions are satisfied: the shape of the second lens L2 is regulated to be not less than 0.46 and not more than (R3+ R4)/(R3-R4) and not more than 9.19, and the deflection degree of the light rays passing through the lens can be alleviated within the range regulated by the conditional expression, so that the aberration can be effectively reduced. Preferably, 0.73. ltoreq. (R3+ R4)/(R3-R4). ltoreq.7.36 is satisfied.
The on-axis thickness of the second lens L2 is d3, and the following relation is satisfied: d3/TTL is more than or equal to 0.02 and less than or equal to 0.07, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 3/TTL. ltoreq.0.06 is satisfied.
Defining the focal length of the third lens L3 as f3, the following relation is satisfied: f3/f is more than or equal to 5.32 and less than or equal to 38.40, the ratio of the focal length of the third lens L3 to the total focal length of the system is specified, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal length. Preferably, 8.51. ltoreq. f 3/f. ltoreq.30.72 is satisfied.
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, and the following relations are satisfied: 7.45 ≦ (R5+ R6)/(R5-R6) ≦ 7.01, and defines the shape of the third lens L3, and within the range defined by the conditional expression, the degree of deflection of the light passing through the lens can be alleviated, and the aberration can be effectively reduced. Preferably, it satisfies-4.66. ltoreq. (R5+ R6)/(R5-R6). ltoreq.5.61.
The third lens L3 has an on-axis thickness d5, and satisfies the following relation: d5/TTL is more than or equal to 0.03 and less than or equal to 0.11, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 5/TTL. ltoreq.0.08 is satisfied.
The focal length of the fourth lens L4 is defined as f4, and the following relation is satisfied: f4/f is not less than-4.93 and is not less than-74.71; the ratio of the focal length of the fourth lens L4 to the focal length of the image pickup optical lens is specified, and this contributes to improvement of image quality within a range of conditions. Preferably, it satisfies-46.7. ltoreq. f 4/f. ltoreq-6.17.
The on-axis thickness of the fourth lens L4 is d7, and the following relation is satisfied: d7/TTL is more than or equal to 0.03 and less than or equal to 0.08, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 7/TTL. ltoreq.0.07 is satisfied.
Defining the focal length of the fifth lens L5 as f5, the following relation is satisfied: f5/f is more than or equal to 0.81 and less than or equal to 3.20. The definition of the fifth lens L5 can effectively make the light ray angle of the camera lens smooth, and reduce tolerance sensitivity. Preferably, 1.29. ltoreq. f 5/f. ltoreq.2.56 is satisfied.
The curvature radius of the object side surface of the fifth lens L5 is R9, the curvature radius of the image side surface of the fifth lens L5 is R10, and the following relational expression is satisfied: -0.08 ≤ (R9+ R10)/(R9-R10) 0.48; the shape of the fifth lens L5 is defined, and when the shape is within this range, it is advantageous to correct the aberration of the off-axis view angle as the angle of the ultra-thin and wide-angle lens progresses. Preferably, it satisfies-0.05 ≦ (R9+ R10)/(R9-R10). ltoreq.0.38.
The on-axis thickness of the fifth lens L5 is d9, and the following relation is satisfied: d9/TTL is more than or equal to 0.04 and less than or equal to 0.14, and ultra-thinning is facilitated. Preferably, 0.07. ltoreq. d 9/TTL. ltoreq.0.11 is satisfied.
Defining the focal length of the sixth lens L6 as f6, the following relation is satisfied: f6/f is not less than-2.73 and not more than-0.82; within the conditional range, the system has better imaging quality and lower sensitivity through reasonable distribution of the optical power. Preferably, it satisfies-1.71. ltoreq. f 6/f. ltoreq-1.02.
The curvature radius of the object side surface of the sixth lens L6 is R11, the curvature radius of the image side surface of the sixth lens L6 is R12, and the following relational expression is satisfied: 1.34-4.24 of (R11+ R12)/(R11-R12); the shape of the sixth lens L6 is specified, and when the condition is within the range, it is advantageous to correct problems such as off-axis aberration along with the development of a very thin and wide angle. Preferably, 2.15. ltoreq. (R11+ R12)/(R11-R12). ltoreq.3.40 is satisfied.
The sixth lens L6 has an on-axis thickness d11, and satisfies the following relation: d11/TTL is more than or equal to 0.07 and less than or equal to 0.22; and the ultra-thinning is favorably realized. Preferably, 0.11. ltoreq. d 11/TTL. ltoreq.0.17 is satisfied.
In the present embodiment, the image height of the imaging optical lens 10 is IH, and satisfies the following relational expression: TTL/IH is less than 1.30, and ultra-thinning is realized.
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.
A combined focal length of the first lens L1 and the second lens L2 is defined as f12, and the following relation is satisfied: f12/f is more than or equal to 0.60 and less than or equal to 1.99; within the range of the conditional expressions, the aberration and distortion of the image pickup optical lens 10 can be eliminated, and the back focal length of the image pickup optical lens 10 can be suppressed, thereby maintaining the miniaturization of the image lens system. Preferably, 0.97. ltoreq. f 12/f. ltoreq.1.59 is satisfied.
In the present embodiment, the field angle of the imaging optical lens 10 is FOV, and satisfies the following relational expression: the FOV is more than or equal to 85.00, which is beneficial to realizing wide angle.
In the present embodiment, the f-number of the imaging optical lens 10 is Fno, and the following relational expression is satisfied: fno is less than or equal to 2.10, which is beneficial to realizing large aperture and has good imaging performance.
When the focal length of the image pickup optical lens 10, the focal length of each lens and the curvature radius satisfy the above relational expression, the image pickup optical lens 10 can have good optical performance, and design requirements of a large aperture, a wide angle and ultra-thinness can be satisfied; in accordance with the characteristics of the optical lens 10, the optical lens 10 is particularly suitable for a mobile phone camera lens module and a WEB camera lens which are configured by image pickup devices such as a high-pixel CCD and a CMOS.
The image pickup optical lens 10 of the present invention will be explained below by way of example. The symbols described in the respective examples are as follows. The unit of focal length, on-axis distance, curvature radius, on-axis thickness, position of reverse curvature and position of stagnation point is mm.
TTL: total optical length (on-axis distance from the object-side surface of the first lens L1 to the image plane) in mm;
preferably, the object side surface and/or the image side surface of the lens may be further provided with an inflection point and/or a stagnation point to meet the requirement of high-quality imaging.
Tables 1 and 2 show design data of the imaging optical lens 10 according to the first embodiment of the present invention.
[ TABLE 1 ]
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: radius of curvature of the object side of the optical filter GF;
r14: 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: the on-axis distance from the image-side surface of the sixth lens L6 to the object-side surface of the optical filter GF;
d 13: on-axis thickness of the optical filter GF;
d 14: 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;
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;
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, A16, A18, A20 are aspheric coefficients.
y＝(x2/R)/[1+{1-(k+1)(x2/R2)}1/2]+A4x4+A6x6+A8x8+A10x10+A12x12+A14x14+A16x16+A18x18+A20x20(1)
For convenience, the aspherical surface of each lens surface uses the aspherical surface shown in the above formula (1). However, the present invention is not limited to the aspherical polynomial form expressed by this formula (1).
Tables 3 and 4 show the inflection point and stagnation point design data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention. 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, and P6R1 and P6R2 represent the object-side surface and the image-side surface of the sixth lens L6, respectively. The "inflection point position" field correspondence data is a vertical distance from an inflection point set on each lens surface to the optical axis of the image pickup optical lens 10. The "stagnation point position" field corresponding data is the vertical distance from the stagnation point set on each lens surface to the optical axis of the imaging optical lens 10.
[ TABLE 3 ]
| Number of points of inflection | Position of reverse curvature 1 | Position of reverse curvature 2 | Reverse bendingPoint location 3 | |
| P1R1 | ||||
| P1R2 | 1 | 1.245 | ||
| P2R1 | ||||
| P2R2 | ||||
| P3R1 | 2 | 0.335 | 1.445 | |
| P3R2 | 1 | 0.165 | ||
| P4R1 | 3 | 0.165 | 1.325 | 1.475 |
| P4R2 | 2 | 0.265 | 1.345 | |
| P5R1 | 3 | 0.815 | 2.225 | 2.445 |
| P5R2 | ||||
| P6R1 | 3 | 0.485 | 2.345 | 3.935 |
| P6R2 | 3 | 0.895 | 4.265 | 4.665 |
[ TABLE 4 ]
Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 656nm, 588nm, 546nm, 486nm, and 436nm passing through the imaging optical lens 10 according to the first embodiment, respectively. Fig. 4 is a schematic view showing the field curvature and distortion of light having a wavelength of 546nm after passing through the imaging optical lens 10 according to the first embodiment, where the field curvature S in fig. 4 is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction.
Table 13 shown later shows values corresponding to the parameters defined in the conditional expressions, for each of the numerical values in the first, second, third, and fourth embodiments.
As shown in table 17, the first embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 2.998mm, a full field height of 6.050mm, and a diagonal field angle of 85.20 °, so that the imaging lens has a wide angle of view, a slim profile, and excellent optical characteristics with a sufficient correction of on-axis and off-axis chromatic aberration.
(second embodiment)
The second embodiment is basically the same as the first embodiment, and the reference numerals are the same as those in the first embodiment, and the configuration of the image pickup optical lens 20 of the second embodiment is shown in fig. 5, and only the differences will be described below.
Tables 5 and 6 show design data of the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 5 ]
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 | Position of reverse curvature 3 | |
| P1R1 | ||||
| P1R2 | ||||
| P2R1 | 1 | 0.845 | ||
| P2R2 | ||||
| P3R1 | 2 | 0.445 | 1.335 | |
| P3R2 | 2 | 0.275 | 1.485 | |
| P4R1 | 3 | 0.115 | 1.155 | 1.605 |
| P4R2 | 3 | 0.195 | 1.215 | 1.945 |
| P5R1 | 2 | 0.765 | 2.285 | |
| P5R2 | 1 | 2.905 | ||
| P6R1 | 3 | 0.495 | 2.325 | 4.005 |
| P6R2 | 3 | 0.915 | 4.455 | 4.645 |
[ TABLE 8 ]
| Number of stagnation points | Location of stagnation 1 | Location of stagnation 2 | |
| P1R1 | |||
| P1R2 | |||
| P2R1 | 1 | 1.095 | |
| P2R2 | |||
| P3R1 | 1 | 0.725 | |
| P3R2 | 1 | 0.485 | |
| P4R1 | 1 | 0.195 | |
| P4R2 | 2 | 0.335 | 1.675 |
| P5R1 | 1 | 1.255 | |
| P5R2 | |||
| P6R1 | 1 | 0.915 | |
| P6R2 | 1 | 2.295 |
Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 656nm, 588nm, 546nm, 486nm, and 436nm passing through the imaging optical lens 20 according to the second embodiment, respectively. Fig. 8 is a schematic view showing curvature of field and distortion of light having a wavelength of 546nm after passing through the imaging optical lens 20 according to the second embodiment.
As shown in table 17, the second embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 3.005mm, a full field image height of 6.050mm, and a diagonal field angle of 85.00 °, and has excellent optical characteristics, in which the imaging optical lens is made wide-angle and slim, and its on-axis and off-axis chromatic aberration is sufficiently corrected.
(third embodiment)
The third embodiment is basically the same as the first embodiment, and the reference numerals are the same as those in the first embodiment, and the configuration of the imaging optical lens 30 of the third embodiment is shown in fig. 9, and only the differences will be described below.
Tables 9 and 10 show design data of the imaging optical lens 30 according to the third embodiment of the present invention.
[ TABLE 9 ]
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 ]
[ TABLE 12 ]
| Number of stagnation points | Location of stagnation 1 | Location of stagnation point2 | |
| P1R1 | |||
| P1R2 | |||
| P2R1 | |||
| P2R2 | |||
| P3R1 | 1 | 0.245 | |
| P3R2 | |||
| P4R1 | 1 | 0.165 | |
| P4R2 | 2 | 0.295 | 1.885 |
| P5R1 | 1 | 0.975 | |
| P5R2 | |||
| P6R1 | 1 | 0.885 | |
| P6R2 | 1 | 2.255 |
Fig. 10 and 11 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 656nm, 588nm, 546nm, 486nm, and 436nm passing through the imaging optical lens 30 according to the third embodiment, respectively. Fig. 12 is a schematic view showing curvature of field and distortion of light having a wavelength of 546nm after passing through the imaging optical lens 30 according to the third embodiment.
Table 17 below shows the numerical values corresponding to the respective conditional expressions in the present embodiment in accordance with the conditional expressions. Obviously, the imaging optical lens of the present embodiment satisfies the above conditional expressions.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 2.992mm, a full field image height of 6.05mm, and a diagonal field angle of 85.40 °, and has excellent optical characteristics, in which the imaging optical lens is made wide-angle and slim, and its on-axis and off-axis chromatic aberration is sufficiently corrected.
(fourth embodiment)
The fourth embodiment is basically the same as the first embodiment, and the reference numerals are the same as those in the first embodiment, and the configuration of the imaging optical lens 40 of the fourth embodiment is shown in fig. 13, and only the differences will be described below.
Tables 13 and 14 show design data of the imaging optical lens 40 according to the fourth embodiment of the present invention.
[ TABLE 13 ]
Table 14 shows aspherical surface data of each lens in the imaging optical lens 30 according to the fourth embodiment of the present invention.
[ TABLE 14 ]
Tables 15 and 16 show the inflection points and the stagnation point design data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.
[ TABLE 15 ]
| Number of points of inflection | Position of reverse curvature 1 | Position of reverse curvature 2 | Position of reverse curvature 3 | |
| P1R1 | ||||
| P1R2 | ||||
| P2R1 | ||||
| P2R2 | ||||
| P3R1 | 1 | 1.405 | ||
| P3R2 | 1 | 1.555 | ||
| P4R1 | 3 | 0.205 | 1.305 | 1.455 |
| P4R2 | 2 | 0.275 | 1.325 | |
| P5R1 | 2 | 0.885 | 2.385 | |
| P5R2 | ||||
| P6R1 | 3 | 0.455 | 2.235 | 3.735 |
| P6R2 | 3 | 0.895 | 4.315 | 4.615 |
[ TABLE 16 ]
Fig. 14 and 15 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 656nm, 588nm, 546nm, 486nm, and 436nm passing through the imaging optical lens 40 according to the fourth embodiment. Fig. 16 is a schematic view showing curvature of field and distortion of light having a wavelength of 546nm after passing through the imaging optical lens 40 according to the third embodiment.
Table 17 below shows the numerical values corresponding to the respective conditional expressions in the present embodiment in accordance with the conditional expressions. Obviously, the imaging optical lens of the present embodiment satisfies the above conditional expressions.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 3.005mm, a full field height of 6.050mm, and a diagonal field angle of 85.20 °, so that the imaging lens has a wide angle and a slim profile, and its on-axis and off-axis chromatic aberration are sufficiently corrected, and the imaging optical lens has excellent optical characteristics.
Table 17 below shows the numerical values corresponding to the respective conditional expressions in the present embodiment in accordance with the conditional expressions. Obviously, the imaging optical lens of the present embodiment satisfies the above conditional expressions.
[ TABLE 17 ]
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific embodiments for practicing the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (10)
1. An imaging optical lens, in order from an object side to an image side, comprising: a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with positive refractive power, a fourth lens element with negative refractive power, a fifth lens element with positive refractive power, and a sixth lens element with negative refractive power;
the abbe number of the first lens is v1, the abbe number of the second lens is v2, the focal length of the imaging optical lens is f, the focal length of the second lens is f2, 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 first lens is d1, and the on-axis distance from the image-side surface of the first lens to the object-side surface of the second lens is d2, so that the following relational expressions are satisfied:
2.80≤v1/v2≤4.30；
-8.00≤f2/f≤-3.00；
2.50≤(R7+R8)/(R7-R8)≤15.00；
2.50≤d1/d2≤6.00。
2. the imaging optical lens according to claim 1, wherein the focal length of the third lens is f3, the focal length of the fifth lens is f5, and the following relationship is satisfied:
6.00≤f3/f5≤12.00。
3. the imaging optical lens of claim 1, wherein the first lens has a focal length of f1, a radius of curvature of an object-side surface of the first lens is R1, a radius of curvature of an image-side surface of the first lens is R2, an on-axis thickness of the first lens is d1, and an optical total length of the imaging optical lens is TTL, and the following relationship is satisfied:
0.48≤f1/f≤1.63；
-4.13≤(R1+R2)/(R1-R2)≤-1.24；
0.05≤d1/TTL≤0.18。
4. the image-capturing optical lens unit according to claim 1, wherein the radius of curvature of the object-side surface of the second lens element is R3, the radius of curvature 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-capturing optical lens unit is TTL, and the following relationships are satisfied:
0.46≤(R3+R4)/(R3-R4)≤9.19；
0.02≤d3/TTL≤0.07。
5. the imaging optical lens of claim 1, wherein the third lens has a focal length of f3, a radius of curvature of an object-side surface of the third lens is R5, a radius of curvature of an image-side surface of the third lens is R6, an on-axis thickness of the third lens is d5, and the imaging optical lens has a total optical length of TTL and satisfies the following relationship:
5.32≤f3/f≤38.40；
-7.45≤(R5+R6)/(R5-R6)≤7.01；
0.03≤d5/TTL≤0.11。
6. the image-capturing optical lens unit according to claim 1, wherein the focal length of the fourth lens element is f4, the on-axis thickness of the fourth lens element is d7, the total optical length of the image-capturing optical lens unit is TTL, and the following relationship is satisfied:
-74.71≤f4/f≤-4.93；
0.03≤d7/TTL≤0.08。
7. the image-capturing optical lens unit according to claim 1, wherein the fifth lens element has a focal length f5, a radius of curvature of an object-side surface of the fifth lens element is R9, a radius of curvature of an image-side surface of the fifth lens element is R10, an on-axis thickness of the fifth lens element is d9, an optical total length of the image-capturing optical lens unit is TTL, and the following relationship is satisfied:
0.81≤f5/f≤3.20；
-0.08≤(R9+R10)/(R9-R10)≤0.48；
0.04≤d9/TTL≤0.14。
8. the image-capturing optical lens unit according to claim 1, wherein the sixth lens element has a focal length f6, a radius of curvature of an object-side surface of the sixth lens element is R11, a radius of curvature of an image-side surface of the sixth lens element is R12, an on-axis thickness of the sixth lens element is d11, an optical total length of the image-capturing optical lens unit is TTL, and the following relationship is satisfied:
-2.73≤f6/f≤-0.82；
1.34≤(R11+R12)/(R11-R12)≤4.24；
0.07≤d11/TTL≤0.22。
9. a camera optical lens according to claim 1, wherein the total optical length of the camera optical lens is TTL, the image height of the camera optical lens is IH, and the following relationship is satisfied:
TTL/IH<1.30。
10. an image-pickup optical lens according to claim 1, wherein a combined focal length of the first lens and the second lens is f12, and the following relational expression is satisfied:
0.60≤f12/f≤1.99。
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