CN111025590B - Image pickup optical lens - Google Patents
Image pickup optical lens Download PDFInfo
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- CN111025590B CN111025590B CN201911384408.2A CN201911384408A CN111025590B CN 111025590 B CN111025590 B CN 111025590B CN 201911384408 A CN201911384408 A CN 201911384408A CN 111025590 B CN111025590 B CN 111025590B
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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, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens; and satisfies the following relationships: f1 is more than or equal to 0; f2/f is more than or equal to 0.70 and less than or equal to 1.50; n4 is more than or equal to 1.55 and less than or equal to 1.70; d1/d2 is more than or equal to 3.00 and less than or equal to 10.00; 3.50 is less than or equal to (R5+ R6)/(R5-R6) is less than or equal to 10.00. The invention provides a large-aperture, wide-angle and ultrathin optical camera lens with good optical performance.
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 with a good function, a light weight, a small size, and a light weight, and thus, 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 eight-piece lens structures gradually appear in the design of the lens. An ultra-thin wide-angle imaging optical lens having excellent optical characteristics is urgently required.
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, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens;
the focal length of the imaging optical lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the refractive index of the fourth lens is n4, the on-axis thickness of the first lens is d1, the on-axis distance from the image side surface of the first lens to the object side surface of the second lens is d2, 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 following relational expressions are satisfied:
f1≥0；
0.70≤f2/f≤1.50；
1.55≤n4≤1.70；
3.00≤d1/d2≤10.00；
3.50≤(R5+R6)/(R5-R6)≤10.00。
preferably, the on-axis thickness of the seventh lens is d13, the on-axis distance from the image-side surface of the seventh lens to the object-side surface of the eighth lens is d14, and the following relationship is satisfied:
1.50≤d14/d13≤5.00。
preferably, 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, and the total optical length of the imaging optical lens system is TTL and satisfies the following relational expression:
0.74≤f1/f≤3.54；
-7.41≤(R1+R2)/(R1-R2)≤-1.13；
0.03≤d1/TTL≤0.11。
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:
0.01≤(R3+R4)/(R3-R4)≤1.21
0.02≤d3/TTL≤0.06。
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 total optical length of the imaging optical lens system is TTL, and the following relationship is satisfied:
-190.75≤f3/f≤-13.15；
0.02≤d5/TTL≤0.05。
preferably, the focal length of the fourth lens element is f4, the radius of curvature of the object-side surface of the fourth lens element is R7, the radius of curvature of the image-side surface of the fourth lens element is R8, the on-axis thickness of the fourth lens element is d7, the total optical length of the image pickup optical lens is TTL, and the following relationships are satisfied:
-3.12≤f4/f≤-0.66；
0.50≤(R7+R8)/(R7-R8)≤3.36；
0.02≤d7/TTL≤0.05。
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:
-31.76≤f5/f≤19.08；
-11.39≤(R9+R10)/(R9-R10)≤4.77；
0.02≤d9/TTL≤0.07。
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:
0.64≤f6/f≤2.65；
0.12≤(R11+R12)/(R11-R12)≤1.84；
0.04≤d11/TTL≤0.16。
preferably, the focal length of the seventh lens element is f7, the curvature radius of the object-side surface of the seventh lens element is R13, the curvature radius of the image-side surface of the seventh lens element is R14, the on-axis thickness of the seventh lens element is d13, the total optical length of the imaging optical lens system is TTL, and the following relationships are satisfied:
-36.16≤f7/f≤8.58；
-9.58≤(R13+R14)/(R13-R14)≤40.30；
0.02≤d13/TTL≤0.13。
preferably, the focal length of the eighth lens element is f8, the radius of curvature of the object-side surface of the eighth lens element is R15, the radius of curvature of the image-side surface of the eighth lens element is R16, the on-axis thickness of the eighth lens element is d15, and the total optical length of the imaging optical lens system is TTL and satisfies the following relationships:
-1.93≤f8/f≤-0.58；
0.53≤(R15+R16)/(R15-R16)≤1.99；
0.03≤d15/TTL≤0.14。
the invention has the beneficial effects that: the invention provides a large-aperture, wide-angle and ultrathin optical camera lens with good optical performance.
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 imaging optical lens 10 according to a first embodiment of the present invention, and the imaging optical lens 10 includes eight lenses. Specifically, the imaging optical lens 10, in order from an object side to an image side, includes: 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, a seventh lens L7, and an eighth lens L8. An optical element such as an optical filter (filter) GF may be disposed between the eighth lens L8 and the image plane Si.
The focal length of the first lens L1 is defined as f1, f1 is more than or equal to 0, the positive and negative of the focal length of the first lens are regulated, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal length.
The focal length of the whole shooting optical lens 10 is defined as f, the focal length of the second lens L2 is defined as f2, f2/f is more than or equal to 0.70 and less than or equal to 1.50, and the spherical aberration and the field curvature of the system can be effectively balanced through reasonable distribution of the focal power.
The refractive index of the fourth lens L4 is defined as n4, 1.55 is not less than n4 is not less than 1.70, and the conditional expression range is favorable for improving the performance of an optical system.
The on-axis thickness of the first lens L1 is defined as 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 d1/d2 is not less than 3.00 and not more than 10.00, so that the total length of an optical system can be compressed within a conditional expression range, and the ultrathin effect is realized.
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, 3.50 ≦ (R5+ R6)/(R5-R6) ≦ 10.00, and the deflection degree of the light passing through the lens can be alleviated and the aberration can be effectively reduced within the range specified by the conditional expression.
When the focal length of the image pickup optical lens 10, the focal length of each lens, the on-axis distance from the image side surface to the object side surface of the relevant lens, and the on-axis thickness satisfy the above-mentioned relational expressions, the image pickup optical lens 10 can have excellent optical characteristics, and a large-aperture, wide-angle, and ultra-thin optical image pickup lens having good optical performance is provided.
The on-axis thickness of the seventh lens L7 is defined as d13, the on-axis distance from the image side surface of the seventh lens L7 to the object side surface of the eighth lens is defined as d14, and d14/d13 is defined as not more than 1.50 and not more than 5.00, so that the total length of an optical system can be compressed within a conditional expression range, and the ultrathin effect is realized. Preferably, 1.58. ltoreq. d14/d 13. ltoreq.4.80.
The focal length of the first lens L1 is defined as f1, and f1/f is more than or equal to 0.74 and less than or equal to 3.54, and the ratio of the focal length of the first lens L1 to the whole focal length is specified. When the first lens element is within the specified range, the first lens element has proper positive refractive power, which is beneficial to reducing system aberration and is beneficial to the development of ultra-thinning and wide-angle lens. Preferably, 1.19. ltoreq. f 1/f. ltoreq.2.83 is satisfied.
Defining the curvature radius of the object side surface of the first lens L1 to be R1, the curvature radius of the image side surface of the first lens L1 to be R2, -7.41 ≦ (R1+ R2)/(R1-R2) ≦ -1.13, and reasonably controlling the shape of the first lens L1 so that the first lens can effectively correct the system spherical aberration; preferably, it satisfies-4.63 ≦ (R1+ R2)/(R1-R2). ltoreq.1.41.
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 0.03 and less than or equal to 0.11, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 1/TTL. ltoreq.0.09 is satisfied.
The curvature radius of the object side surface of the second lens L2 is R3, the curvature radius of the image side surface of the second lens L2 is R4, and the following relational expression is satisfied: the second lens L2 is defined to have a shape of 0.01 to (R3+ R4)/(R3-R4) to 1.21, and the problem of chromatic aberration on the axis can be corrected favorably as the lens is brought to an ultra-thin wide angle within the range. Preferably, 0.02 ≦ (R3+ R4)/(R3-R4) ≦ 0.97 is satisfied.
The on-axis thickness of the second lens L2 is d3, and satisfies the following relation: d3/TTL is more than or equal to 0.02 and less than or equal to 0.06, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 3/TTL. ltoreq.0.05 is satisfied.
The focal length of the third lens is defined as f3, -190.75 ≦ f3/f ≦ -13.15, and the system has better imaging quality and lower sensitivity through reasonable distribution of the optical power. Preferably, it satisfies-119.22 ≦ f3/f ≦ -16.43.
The curvature radius of the object side surface of the third lens L3 is R5, the curvature radius of the image side surface of the third lens L3 is R6, and the following relations are satisfied: 1.75-14.98 of (R5+ R6)/(R5-R6), can effectively control the shape of the third lens L3, is beneficial to the forming of the third lens L3, and can alleviate the deflection degree of light rays passing through the lens and effectively reduce aberration within the range specified by the conditional expression. Preferably, 2.80 ≦ (R5+ R6)/(R5-R6) ≦ 11.98.
The on-axis thickness of the third lens L3 is d5, and satisfies the following relation: d5/TTL is more than or equal to 0.02 and less than or equal to 0.05, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 5/TTL. ltoreq.0.04 is satisfied.
The focal length of the fourth lens L4 is f4, and the following relationship is satisfied: 3.12 ≦ f4/f ≦ -0.66, allowing better imaging quality and lower sensitivity of the system through reasonable distribution of optical power. Preferably, it satisfies-1.95. ltoreq. f 4/f. ltoreq-0.83.
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 relational expression is satisfied: the ratio of (R7+ R8)/(R7-R8) is 0.50 to 3.36, and the shape of the fourth lens L4 is defined so that the problem of aberration of the off-axis angle can be corrected with the development of an ultra-thin wide angle within the range. Preferably, 0.80. ltoreq. (R7+ R8)/(R7-R8). ltoreq.2.69 is satisfied.
The on-axis thickness of the fourth lens L4 is d7, and the following relation is satisfied: d7/TTL is more than or equal to 0.02 and less than or equal to 0.05, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 7/TTL. ltoreq.0.04 is satisfied.
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 relationships are satisfied: 31.76 ≦ f5/f ≦ 19.08, and the definition of the fifth lens L5 can effectively make the light angle of the camera lens gentle and reduce the tolerance sensitivity. Preferably, it satisfies-19.85. ltoreq. f 5/f. ltoreq.15.26.
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: 11.39 ≦ (R9+ R10)/(R9-R10) ≦ 4.77, and the shape of the fifth lens L5 is specified, and when the conditions are within the range, it is advantageous to correct the aberration of the off-axis view angle and the like as the ultra-thin wide angle is developed. Preferably, it satisfies-7.12 ≦ (R9+ R10)/(R9-R10). ltoreq.3.82.
The fifth lens L5 has an on-axis thickness d9, and satisfies the following relationship: d9/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 9/TTL. ltoreq.0.05 is satisfied.
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 0.64 and less than or equal to 2.65, and the system has better imaging quality and lower sensitivity through reasonable distribution of the focal power. Preferably, 1.03. ltoreq. f 6/f. ltoreq.2.12 is satisfied.
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: 0.12 ≦ (R11+ R12)/(R11-R12) ≦ 1.84, and the shape of the sixth lens L6 is specified, and when the conditions are within the range, it is advantageous to correct the problems such as off-axis picture angle aberration with the development of ultra-thin wide-angle. Preferably, 0.19. ltoreq. R11+ R12)/(R11-R12. ltoreq.1.47 is satisfied.
The on-axis thickness of the sixth lens L6 is d11, and satisfies the following relation: d11/TTL is more than or equal to 0.04 and less than or equal to 0.16, and ultra-thinning is facilitated. Preferably, 0.07. ltoreq. d 11/TTL. ltoreq.0.12 is satisfied.
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: 36.16 ≦ f7/f ≦ 8.58, which allows better imaging quality and lower sensitivity of the system through a reasonable distribution of powers. Preferably, it satisfies-22.60 ≦ f7/f ≦ 6.87.
The curvature radius R13 of the object-side surface of the seventh lens L7 and the curvature radius R14 of the image-side surface of the seventh lens L7 satisfy the following relations: 9.58 (R13+ R14)/(R13-R14) 40.30 or less, and the shape of the seventh lens L7 is determined so that the aberration of the off-axis view can be corrected as the ultra-thin wide angle is increased within the range of conditions. Preferably, it satisfies-5.99. ltoreq. (R13+ R14)/(R13-R14). ltoreq.32.24.
The seventh lens L7 has an on-axis thickness d13, and satisfies the following relationship: d13/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 13/TTL. ltoreq.0.11 is satisfied.
The focal length of the entire image pickup optical lens 10 is f, and the focal length of the eighth lens L8 is f8, and the following relations are satisfied: 1.93 ≦ f8/f ≦ -0.58, allowing better imaging quality and lower sensitivity of the system through reasonable distribution of optical power. Preferably, it satisfies-1.21. ltoreq. f 8/f. ltoreq-0.73.
The curvature radius R15 of the object side surface of the eighth lens L8 and the curvature radius R16 of the image side surface of the eighth lens L8 satisfy the following relations: 0.53 ≤ (R15+ R16)/(R15-R16) ≤ 1.99, and the shape of the eighth lens L8 is determined, and the lens can be used for correcting aberration of off-axis picture angle with ultra-thin wide angle under the condition. Preferably, 0.85. ltoreq. (R15+ R16)/(R15-R16). ltoreq.1.59 is satisfied.
The eighth lens L8 has an on-axis thickness d15, and satisfies the following relationship: d15/TTL is more than or equal to 0.03 and less than or equal to 0.14, and ultra-thinning is facilitated. Preferably, 0.05. ltoreq. d 15/TTL. ltoreq.0.11 is satisfied.
In this embodiment, the 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 not less than 0.29 and not more than 1.16, and within the range of the conditional expression, 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, so as to keep the miniaturization of the image lens system. Preferably, 0.46. ltoreq. f 12/f. ltoreq.0.93.
In the present embodiment, the ratio between the total optical length TTL of the imaging optical lens 10 and the image height IH of the imaging optical lens 10 satisfies the following relationship: TTL/IH is less than or equal to 1.62, and ultra-thinning is facilitated.
In the present embodiment, the field angle FOV in the diagonal direction of the imaging optical lens 10 is equal to or larger than 70 °, which is advantageous for achieving a wide angle.
In the present embodiment, the F-number Fno of the imaging optical lens 10 is 1.56 or less, and the large aperture is good in imaging performance.
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: a radius of curvature of the object side surface of the eighth lens L8;
r16: a radius of curvature of the image-side surface of the eighth lens L8;
r17: radius of curvature of the object side of the optical filter GF;
r18: the radius of curvature of the image-side surface of the optical filter GF;
d: an on-axis thickness of the lenses and an on-axis distance between the lenses;
d 0: the on-axis distance of the stop S1 to the object-side surface of the first lens L1;
d 1: the on-axis thickness of the first lens L1;
d 2: the on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2;
d 3: the on-axis thickness of the second lens L2;
d 4: the on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;
d 5: the on-axis thickness of the third lens L3;
d 6: the on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4;
d 7: the on-axis thickness of the fourth lens L4;
d 8: an on-axis distance from an image-side surface of the fourth lens L4 to an object-side surface of the fifth lens L5;
d 9: the on-axis thickness of the fifth lens L5;
d 10: an on-axis distance from an image-side surface of the fifth lens L5 to an object-side surface of the sixth lens L6;
d 11: the on-axis thickness of the sixth lens L6;
d 12: an on-axis distance from the image-side surface of the sixth lens L6 to the object-side surface of the seventh lens L7;
d 13: the on-axis thickness of the seventh lens L7;
d 14: 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: the on-axis thickness of the eighth lens L8;
d 16: the on-axis distance from the image-side surface of the eighth lens L8 to the object-side surface of the optical filter GF;
d 17: on-axis thickness of the optical filter GF;
d 18: the on-axis distance from the image side surface of the optical filter GF to the image surface;
nd: the refractive index of the d-line;
nd 1: the refractive index of the d-line of the first lens L1;
nd 2: the refractive index of the d-line of the second lens L2;
nd 3: the refractive index of the d-line of the third lens L3;
nd 4: the refractive index of the d-line of the fourth lens L4;
nd 5: the refractive index of the d-line of the fifth lens L5;
nd 6: the refractive index of the d-line of the sixth lens L6;
nd 7: the refractive index of the d-line of the seventh lens L7;
nd 8: the refractive index of the d-line of the eighth lens L8;
ndg: the refractive index of the d-line of the optical filter GF;
vd: an Abbe number;
v 1: abbe number of the first lens L1;
v 2: abbe number of the second lens L2;
v 3: abbe number of the third lens L3;
v 4: abbe number of the fourth lens L4;
v 5: abbe number of the fifth lens L5;
v 6: abbe number of the sixth lens L6;
v 7: abbe number of the seventh lens L7;
v 8: abbe number of the eighth lens L8;
vg: abbe number of the optical filter GF.
Table 2 shows aspherical surface data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention.
[ TABLE 2 ]
Wherein k is a conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18, A20 are aspheric coefficients.
IH: image height
y＝(x2/R)/[1+{1-(k+1)(x2/R2)}1/2]+A4x4+A6x6+A8x8+A10x10+A12x12+A14x14+A16x16+A18x18+A20x20 (1)
For convenience, the aspherical surface of each lens surface uses the aspherical surface shown in the above formula (1). However, the present invention is not limited to the aspherical polynomial form expressed by this formula (1).
Tables 3 and 4 show the inflection point and stagnation point design data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention. Wherein P1R1 and P1R2 represent the object-side surface and the image-side surface of the first lens L1, P2R1 and P2R2 represent the object-side surface and the image-side surface of the second lens L2, P3R1 and P3R2 represent the object-side surface and the image-side surface of the third lens L3, P4R1 and P4R2 represent the object-side surface and the image-side surface of the fourth lens L4, P5R1 and P5R2 represent the object-side surface and the image-side surface of the fifth lens L5, P6R1 and P6R2 represent the object-side surface and the image-side surface of the sixth lens L6, P7R1 and P7R2 represent the object-side surface and the image-side surface of the seventh lens L7, and P8R1 and P8R2 represent the object-side surface and the image-side surface of the eighth lens L8, respectively. The "inflection point position" field correspondence data is a vertical distance from an inflection point set on each lens surface to the optical axis of the image pickup optical lens 10. The "stagnation point position" field corresponding data is the vertical distance from the stagnation point set on each lens surface to the optical axis of the imaging optical lens 10.
[ TABLE 3 ]
| Number of points of inflection | Position of reverse curvature 1 | Position of reverse curvature 2 | |
| P1R1 | 2 | 1.465 | 1.765 |
| P1R2 | 2 | 1.045 | 1.595 |
| P2R1 | 1 | 1.025 | |
| |
0 | ||
| |
0 | ||
| P3R2 | 1 | 0.335 | |
| |
0 | ||
| |
0 | ||
| |
0 | ||
| |
0 | ||
| P6R1 | 1 | 0.765 | |
| |
0 | ||
| P7R1 | 2 | 0.885 | 3.175 |
| P7R2 | 2 | 0.925 | 3.455 |
| P8R1 | 1 | 0.295 | |
| P8R2 | 1 | 0.985 |
[ TABLE 4 ]
| Stationed pointNumber of | Location of stagnation 1 | |
| |
0 | |
| |
0 | |
| |
0 | |
| |
0 | |
| |
0 | |
| P3R2 | 1 | 0.565 |
| |
0 | |
| |
0 | |
| |
0 | |
| |
0 | |
| P6R1 | 1 | 1.255 |
| |
0 | |
| P7R1 | 1 | 1.515 |
| P7R2 | 1 | 1.645 |
| P8R1 | 1 | 0.505 |
| P8R2 | 1 | 2.425 |
Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 656nm, 587nm, 546nm, 486nm, and 436nm passing through the imaging optical lens 10 according to the first embodiment. Fig. 4 is a schematic view showing the field curvature and distortion of light having a wavelength of 546nm after passing through the imaging optical lens 10 according to the first embodiment, where the field curvature S in fig. 4 is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction.
Table 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 5.078mm, a full field image height of 6.000mm, a diagonal field angle of 71.00 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
(second embodiment)
The second embodiment is basically the same as the first embodiment, the same reference numerals as in the first embodiment, and only different points will be described below.
Tables 5 and 6 show design data of the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 5 ]
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 ]
[ TABLE 8 ]
| Number of stagnation points | Location of stagnation 1 | Location of stagnation 2 | |
| |
0 | ||
| |
0 | ||
| P2R1 | 2 | 1.235 | 1.805 |
| P2R2 | 1 | 1.785 | |
| |
0 | ||
| P3R2 | 1 | 0.375 | |
| |
0 | ||
| |
0 | ||
| |
0 | ||
| |
0 | ||
| |
0 | ||
| |
0 | ||
| P7R1 | 1 | 1.695 | |
| P7R2 | 1 | 1.725 | |
| P8R1 | 1 | 0.225 | |
| P8R2 | 1 | 2.065 |
Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 656nm, 587nm, 546nm, 486nm, and 436nm passing through the imaging optical lens 20 according to the second embodiment. Fig. 8 is a schematic view showing curvature of field and distortion of light having a wavelength of 546nm after passing through the imaging optical lens 20 according to the second embodiment.
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 5.087mm, a full field image height of 6.000mm, a diagonal field angle of 70.92 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
(third embodiment)
The third embodiment is basically the same as the first embodiment, the same reference numerals as in the first embodiment, and only different points will be described below.
Tables 9 and 10 show design data of the imaging optical lens 30 according to the third embodiment of the present invention.
[ TABLE 9 ]
Table 10 shows aspherical surface data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.
[ TABLE 10 ]
Tables 11 and 12 show the inflection points and the stagnation point design data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.
[ TABLE 11 ]
| Number of points of inflection | Position of reverse curvature 1 | Position of reverse curvature 2 | |
| P1R1 | 1 | 1.295 | |
| P1R2 | 2 | 1.135 | 1.445 |
| P2R1 | 2 | 1.045 | 1.415 |
| P2R2 | 1 | 1.175 | |
| |
0 | ||
| P3R2 | 2 | 0.215 | 0.715 |
| P4R1 | 2 | 0.035 | 1.035 |
| |
0 | ||
| P5R1 | 1 | 1.315 | |
| P5R2 | 2 | 0.285 | 1.205 |
| P6R1 | 1 | 2.335 | |
| |
0 | ||
| P7R1 | 2 | 0.815 | 3.205 |
| P7R2 | 2 | 0.685 | 3.495 |
| P8R1 | 2 | 0.215 | 3.755 |
| P8R2 | 1 | 1.005 |
[ TABLE 12 ]
| Number of stagnation points | Location of stagnation 1 | Location of stagnation 2 | |
| |
0 | ||
| |
0 | ||
| |
0 | ||
| |
0 | ||
| |
0 | ||
| P3R2 | 2 | 0.425 | 0.935 |
| P4R1 | 1 | 0.055 | |
| |
0 | ||
| |
0 | ||
| P5R2 | 2 | 0.515 | 1.595 |
| |
0 | ||
| |
0 | ||
| P7R1 | 1 | 1.435 | |
| P7R2 | 1 | 1.175 | |
| P8R1 | 1 | 0.355 | |
| P8R2 | 1 | 2.405 |
Fig. 10 and 11 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 656nm, 587nm, 546nm, 486nm, and 436nm passing through the imaging optical lens 30 according to the third embodiment. Fig. 12 is a schematic view showing curvature of field and distortion of light having a wavelength of 546nm after passing through the imaging optical lens 30 according to the third embodiment.
Table 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 5.092mm, a full field image height of 6.000mm, a diagonal field angle of 71.40 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
[ TABLE 13 ]
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, comprising eight lens elements in order from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens; the third lens element with negative refractive power, the fourth lens element with negative refractive power, the sixth lens element with positive refractive power, and the eighth lens element with negative refractive power;
the focal length of the imaging optical lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the refractive index of the fourth lens is n4, the on-axis thickness of the first lens is d1, the on-axis distance from the image side surface of the first lens to the object side surface of the second lens is d2, 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, 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 following relational expressions are satisfied:
f1＞0；
0.70≤f2/f≤1.50；
1.55≤n4≤1.70；
3.00≤d1/d2≤10.00；
0.01≤(R3+R4)/(R3-R4)≤1.21；
3.50≤(R5+R6)/(R5-R6)≤10.00。
2. the imaging optical lens according to claim 1, wherein an on-axis thickness of the seventh lens is d13, an on-axis distance from an image-side surface of the seventh lens to an object-side surface of the eighth lens is d14, and the following relational expression is satisfied:
1.50≤d14/d13≤5.00。
3. the imaging optical lens of claim 1, wherein the radius of curvature of the object-side surface of the first lens element is R1, the radius of curvature of the image-side surface of the first lens element is R2, the total optical length of the imaging optical lens is TTL, and the following relationships are satisfied:
0.74≤f1/f≤3.54；
-7.41≤(R1+R2)/(R1-R2)≤-1.13；
0.03≤d1/TTL≤0.11。
4. a photographic optical lens according to claim 1, wherein the on-axis thickness of the second lens element is d3, the total optical length of the photographic optical lens is TTL, and the following relationship is satisfied:
0.02≤d3/TTL≤0.06。
5. the image-capturing optical lens of claim 1, wherein the focal length of the third lens is f3, the on-axis thickness of the third lens is d5, the total optical length of the image-capturing optical lens is TTL, and the following relationship is satisfied:
-190.75≤f3/f≤-13.15；
0.02≤d5/TTL≤0.05。
6. the image-capturing optical lens unit according to claim 1, wherein the fourth lens element has a focal length f4, a radius of curvature of an object-side surface of the fourth lens element is R7, a radius of curvature of an image-side surface of the fourth lens element is R8, an on-axis thickness of the fourth lens element is d7, an optical total length of the image-capturing optical lens unit is TTL, and the following relationship is satisfied:
-3.12≤f4/f≤-0.66；
0.50≤(R7+R8)/(R7-R8)≤3.36；
0.02≤d7/TTL≤0.05。
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:
-31.76≤f5/f≤19.08；
-11.39≤(R9+R10)/(R9-R10)≤4.77；
0.02≤d9/TTL≤0.07。
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:
0.64≤f6/f≤2.65；
0.12≤(R11+R12)/(R11-R12)≤1.84；
0.04≤d11/TTL≤0.16。
9. the image-taking optical lens according to claim 1, wherein the seventh lens element has a focal length f7, a radius of curvature of an object-side surface of the seventh lens element is R13, a radius of curvature of an image-side surface of the seventh lens element is R14, an on-axis thickness of the seventh lens element is d13, an optical total length of the image-taking optical lens is TTL, and the following relationship is satisfied:
-36.16≤f7/f≤8.58；
-9.58≤(R13+R14)/(R13-R14)≤40.30；
0.02≤d13/TTL≤0.13。
10. the image-capturing optical lens unit according to claim 1, wherein the eighth lens element has a focal length f8, a radius of curvature of an object-side surface of the eighth lens element is R15, a radius of curvature of an image-side surface of the eighth lens element is R16, an on-axis thickness of the eighth lens element is d15, an optical total length of the image-capturing optical lens unit is TTL, and the following relationship is satisfied:
-1.93≤f8/f≤-0.58；
0.53≤(R15+R16)/(R15-R16)≤1.99；
0.03≤d15/TTL≤0.14。
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| US10514528B2 (en) * | 2015-08-11 | 2019-12-24 | Largan Precision Co., Ltd. | Photographing optical lens system, image capturing unit and electronic device |
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| CN206440879U (en) * | 2015-12-21 | 2017-08-25 | 康达智株式会社 | Pick-up lens |
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