CN111045193A - Camera optics - Google Patents
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- CN111045193A CN111045193A CN201911398184.0A CN201911398184A CN111045193A CN 111045193 A CN111045193 A CN 111045193A CN 201911398184 A CN201911398184 A CN 201911398184A CN 111045193 A CN111045193 A CN 111045193A
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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 the following components from an object side to an image side: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens; at least one of the first to sixth lenses has a free-form surface, a focal length of the first lens is f1, a focal length of the second lens is f2, a focal length of the third lens is f3, a focal length of the fourth lens is f4, and the following relationships are satisfied: f1 is more than or equal to 0.00; f2 is less than or equal to 0.00; f3 is more than or equal to 0.00; f4 is less than or equal to 0.00. The camera optical lens provided by the invention has good optical performance, and simultaneously meets the design requirements of high resolution, wide angle and good imaging quality.
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
With the development of imaging lenses, people have higher and higher imaging requirements on the lenses, and night scene shooting and background blurring of the lenses also become important indexes for measuring the imaging standards of the lenses. At present, rotationally symmetrical aspheric surfaces are mostly adopted, and the aspheric surfaces only have sufficient freedom degree in a meridian plane and cannot well correct off-axis aberration. The free-form surface is a non-rotational symmetric surface type, so that aberration can be well balanced, imaging quality is improved, and the processing of the free-form surface is gradually mature. With the improvement of the requirements on lens imaging, the addition of the free-form surface is very important when the lens is designed, and the effect is more obvious particularly in the design of wide-angle and ultra-wide-angle lenses.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an imaging optical lens having good optical performance, high resolution, wide angle, and good imaging quality.
In order to solve the above-mentioned problems, an embodiment of the present invention provides an imaging optical lens, comprising, in order from an object side to an image side: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens;
at least one of the first to sixth lenses has a free-form surface, a focal length of the first lens is f1, a focal length of the second lens is f2, a focal length of the third lens is f3, a focal length of the fourth lens is f4, and the following relationships are satisfied:
f1≥0.00；
f2≤0.00；
f3≥0.00；
f4≤0.00。
preferably, a ratio of the focal length f1 of the first lens to the focal length f3 of the third lens satisfies the following relation:
0.00≤f1/f3≤1.00。
preferably, the focal length of the image capturing optical lens is f, 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 on-axis thickness of the first lens element is d1, and the total optical length of the image capturing optical lens is TTL and satisfies the following relation:
0.38≤f1/f≤1.42；
-3.44≤(R1+R2)/(R1-R2)≤-0.48；
0.08≤d1/TTL≤0.30。
preferably, the focal length of the image pickup optical lens is f, 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 optical total length of the image pickup optical lens is TTL and satisfies the following relation:
-5.60≤f2/f≤-1.03；
1.08≤(R3+R4)/(R3-R4)≤5.82；
0.02≤d3/TTL≤0.07。
preferably, the focal length of the image pickup optical lens is f, 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 image pickup optical lens is TTL and satisfies the following relation:
0.42≤f3/f≤2430.45；
-20.34≤(R5+R6)/(R5-R6)≤598.19；
0.03≤d5/TTL≤0.36。
preferably, the focal length of the image pickup optical lens is f, 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, and the optical total length of the image pickup optical lens is TTL and satisfies the following relation:
-19.93≤f4/f≤-0.97；
-2.51≤(R7+R8)/(R7-R8)≤10.54；
0.03≤d7/TTL≤0.09。
preferably, the imaging optical lens has a focal length f, the fifth lens element has a focal length f5, the fifth lens element has an object-side surface with a radius of curvature R9, the fifth lens element has an image-side surface with a radius of curvature R10, the fifth lens element has an on-axis thickness d9, the imaging optical lens element has a total optical length TTL, and the following relationships are satisfied:
0.32≤f5/f≤2.58；
-3.08≤(R9+R10)/(R9-R10)≤2.00；
0.02≤d9/TTL≤0.25。
preferably, the imaging optical lens has a focal length f, the sixth lens element has a focal length f6, the object-side surface of the sixth lens element has a radius of curvature R11, the image-side surface of the sixth lens element has a radius of curvature R12, the sixth lens element has an on-axis thickness d11, and the imaging optical lens has a total optical length TTL which satisfies the following relationship:
-2.39≤f6/f≤-0.34；
0.22≤(R11+R12)/(R11-R12)≤3.37；
0.02≤d11/TTL≤0.17。
preferably, the F-number of the imaging optical lens is Fno, and the following relationship is satisfied: fno is less than or equal to 2.06.
Preferably, the total optical length of the image pickup optical lens is TTL, the full field of view height of the image pickup optical lens in the diagonal direction is IH, and the following relationship is satisfied:
TTL/IH≤0.91。
the invention has the beneficial effects that: the pick-up optical lens has the characteristics of high resolution, wide angle and good imaging quality while having good optical performance, and is particularly suitable for a mobile phone pick-up lens assembly and a WEB pick-up lens which are composed of pick-up elements such as CCD (charge coupled device), CMOS (complementary metal oxide semiconductor) and the like for high pixels.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
fig. 1 is a schematic configuration diagram of an imaging optical lens according to a first embodiment of the present invention;
FIG. 2 is a diagram of the imaging optics of FIG. 1 with the RMS spot diameter in the first quadrant;
fig. 3 is a schematic configuration diagram of an imaging optical lens according to a second embodiment of the present invention;
FIG. 4 is a diagram of the imaging optics of FIG. 3 with the RMS spot diameter in the first quadrant;
fig. 5 is a schematic configuration diagram of an imaging optical lens according to a third embodiment of the present invention;
FIG. 6 is a plot of the RMS spot diameter for the imaging optics lens of FIG. 5 in the first quadrant;
fig. 7 is a schematic configuration diagram of an imaging optical lens according to a fourth embodiment of the present invention;
FIG. 8 is a plot of the RMS spot diameter for the imaging optics lens of FIG. 7 in the first quadrant;
fig. 9 is a schematic configuration diagram of an imaging optical lens according to a fifth embodiment of the present invention;
fig. 10 is a case where the RMS spot diameter of the imaging optical lens shown in fig. 9 is in the first quadrant.
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 six lenses. Specifically, the imaging optical lens 10, in order from an object side to an image side, includes: the lens comprises a diaphragm S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6. An optical element such as an optical filter (filter) GF may be disposed between the sixth lens L6 and the image plane Si.
The first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, the fifth lens element L5 with positive refractive power and the sixth lens element L6 with negative refractive power.
In this embodiment, 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, and the sixth lens L6 is made of plastic. The lens has good optical performance by rationalizing the material of the lens.
In this embodiment, at least one of the first lens L1 to the sixth lens L6 is defined to have a free-form surface, the focal length of the first lens L1 is defined to be f1, the focal length of the second lens L2 is defined to be f2, the focal length of the third lens L3 is defined to be f3, and the focal length of the fourth lens L4 is defined to be f4, and the following relations are satisfied: f1 is more than or equal to 0.00, f2 is less than or equal to 0.00, f3 is more than or equal to 0.00, and f4 is less than or equal to 0.00. The free-form surface contributes to aberration correction such as astigmatism, field curvature, distortion and the like of the wide-angle optical system, and when the conditional expressions are satisfied, the imaging optical lens 10 can satisfy the design requirements of high resolution, wide angle and good imaging quality.
Defining a focal length of the first lens L1 as f1, a focal length of the third lens L3 as f3, and satisfying the following relations: f1/f3 is more than or equal to 0.00 and less than or equal to 1.00, the ratio of the focal length f1 of the first lens L1 to the focal length f3 of the third lens L3 is specified, and reasonable distribution of focal power is realized, so that the system has better imaging quality and lower sensitivity. Preferably, the following are satisfied: f1/f3 is more than or equal to 0.00 and less than or equal to 0.95.
Defining the focal length f of the image pickup optical lens 10 and the focal length f1 of the first lens, the following relation is satisfied: f1/f is more than or equal to 0.38 and less than or equal to 1.42, the ratio of the focal length of the first lens L1 to the focal length f of the image pickup optical lens 10 is specified, and within the range specified by the conditional expression, the first lens L1 has proper positive refractive power, which is beneficial to aberration correction and improves the imaging quality, and preferably, the condition that f1/f is more than or equal to 0.60 and less than or equal to 1.13 is met.
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: 3.44 ≦ (R1+ R2)/(R1-R2) ≦ -0.48, and the shape of the first lens L1 is appropriately controlled so that the first lens L1 can effectively correct the system spherical aberration, preferably, satisfying-2.15 ≦ (R1+ R2)/(R1-R2) ≦ -0.60.
The on-axis thickness of the first lens L1 is d1, the total optical length of the imaging optical lens system 10 is TTL, and the following relationship is satisfied: d1/TTL is more than or equal to 0.08 and less than or equal to 0.30, and ultra-thinning is facilitated. Preferably, 0.13. ltoreq. d 1/TTL. ltoreq.0.24 is satisfied.
Defining the focal length of the second lens L2 as f2 and the focal length of the image pickup optical lens 10 as f, the following relations are satisfied: -5.60 ≦ f2/f ≦ -1.03, and it is advantageous to correct aberrations of the optical system by controlling the negative power of the second lens L2 within a reasonable range. Preferably, it satisfies-3.50. ltoreq. f 2/f. ltoreq-1.29.
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: 1.08 ≦ (R3+ R4)/(R3-R4) ≦ 5.82, and the shape of the second lens L2 is defined, and in the range, the problem of chromatic aberration on the axis is favorably corrected as the lens is made to be an ultra-thin wide angle, and preferably, 1.73 ≦ (R3+ R4)/(R3-R4) ≦ 4.65.
Defining the on-axis thickness of the second lens L2 as d3, the total optical length of the image pickup optical lens 10 as TTL, and satisfying the following relation: 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 and the focal length of the image pickup optical lens 10 as f, the following relations are satisfied: f3/f 2430.45 is more than or equal to 0.42, so that the system has better imaging quality and lower sensitivity through reasonable distribution of focal power. Preferably, 0.68. ltoreq. f 3/f. ltoreq. 1944.36 is satisfied.
The curvature radius of the object side surface of the third lens L3 is defined as R5, the curvature radius of the image side surface of the third lens L3 is defined as R6, and the following relational expressions are satisfied: the shape of the third lens L3 is regulated to be (R5+ R6)/(R5-R6) is less than or equal to 598.19 and the deflection degree of the light rays passing through the lens can be relieved within the range regulated by the conditional expression, so that the aberration can be effectively reduced. Preferably, it satisfies-12.71 ≦ (R5+ R6)/(R5-R6). ltoreq. 478.55.
Defining the on-axis thickness of the third lens L3 as d5, the total optical length of the imaging optical lens system 10 as TTL, and satisfying the following relation: d5/TTL is more than or equal to 0.03 and less than or equal to 0.36, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 5/TTL. ltoreq.0.29 is satisfied.
Defining the focal length of the fourth lens L4 as f4, the following relation is satisfied: 19.93 f4/f 0.97, and the ratio of the focal length of the fourth lens L4 to the focal length of the system is specified, which contributes to the improvement of the optical system performance within the conditional expression range. Preferably, it satisfies-12.46. ltoreq. f 4/f. ltoreq-1.21.
The curvature radius of the object side surface of the fourth lens L4 is defined as R7, the curvature radius of the image side surface of the fourth lens L4 is defined as R8, and the following relational expressions are satisfied: the shape of the fourth lens L4 is defined to be (R7+ R8)/(R7-R8) to be (10.54) 2.51 to (R7+ R8), and when the shape is within the range defined by the conditional expression, the problem of aberration of the off-axis angle is favorably corrected along with the development of the ultra-thin and wide-angle. Preferably, it satisfies-1.57 ≦ (R7+ R8)/(R7-R8). ltoreq.8.43.
Defining the on-axis thickness of the fourth lens L4 as d7, the total optical length of the image pickup optical lens 10 as TTL, and satisfying the following relation: d7/TTL is more than or equal to 0.03 and less than or equal to 0.09, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 7/TTL. ltoreq.0.08 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 0.32 and less than or equal to 2.58, and the limitation on the fifth lens L5 can effectively make the light ray angle of the camera lens smooth and reduce the tolerance sensitivity. Preferably, 0.52. ltoreq. f 5/f. ltoreq.2.07 is satisfied.
The curvature radius of the object side surface of the fifth lens L5 is defined as R9, the curvature radius of the image side surface of the fifth lens L5 is defined as R10, and the following relational expressions are satisfied: -3.08 ≦ (R9+ R10)/(R9-R10) ≦ 2.00, and the shape of the fifth lens L5 is specified, and when the shape is within the range specified by the conditional expression, 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-1.92. ltoreq. (R9+ R10)/(R9-R10). ltoreq.1.60.
Defining the on-axis thickness of the fifth lens L5 as d9, the total optical length of the imaging optical lens system 10 as TTL, and satisfying the following relation: d9/TTL is more than or equal to 0.02 and less than or equal to 0.25, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 9/TTL. ltoreq.0.20 is satisfied.
Defining the focal length of the sixth lens L6 as f6, the following relation is satisfied: 2.39 ≦ f6/f ≦ -0.34, allowing better imaging quality and lower sensitivity of the system through reasonable distribution of optical power. Preferably, it satisfies-1.49. ltoreq. f 6/f. ltoreq-0.42.
The curvature radius of the object side surface of the sixth lens L6 is defined as R11, the curvature radius of the image side surface of the sixth lens L6 is defined as R12, and the following relational expressions are satisfied: 0.22 to (R11+ R12)/(R11-R12) to 3.37, and the shape of the sixth lens L6 is defined, and when the conditions are within the range, the problem of aberration of off-axis picture angle is favorably corrected as the ultra-thin wide angle is developed. Preferably, 0.35. ltoreq. (R11+ R12)/(R11-R12). ltoreq.2.69 is satisfied.
Defining the on-axis thickness of the sixth lens L6 as d11, the total optical length of the imaging optical lens system 10 as TTL, and satisfying the following relation: d11/TTL is more than or equal to 0.02 and less than or equal to 0.17, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 11/TTL. ltoreq.0.14 is satisfied.
In the present embodiment, the F number of the aperture of the imaging optical lens 10 is 2.06 or less, and the large aperture has good imaging performance. Preferably, the F-number of the diaphragm of the imaging optical lens 10 is Fno less than or equal to 2.02.
In the present embodiment, the total optical length of the image pickup optical lens 10 is TTL, the full field of view height of the image pickup optical lens 10 in the diagonal direction is IH, and the following relational expression is satisfied: TTL/IH is less than or equal to 0.91, and ultra-thinning is facilitated.
When the above relationship is satisfied, the image pickup optical lens 10 has good optical performance, and the free-form surface is adopted, so that the matching of the designed image surface area and the actual use area can be realized, and the image quality of the effective area is improved to the maximum extent; 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 units of focal length, on-axis distance, radius of curvature, on-axis thickness are 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;
tables 1 and 2 show design data of the imaging optical lens 10 according to the first embodiment of the present invention. The object-side surface and the image-side surface of the first lens L1 are free-form surfaces.
[ 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;
d: on-axis thickness of the lenses and 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 ]
Where k is a conic coefficient a4, a6, A8, a10, a12, a14, a16, a18, a20, an aspheric coefficient, r is a perpendicular distance between a point on an aspheric curve and an optical axis, and z is an aspheric depth (a perpendicular distance between a point on an aspheric surface at a distance of r from the optical axis and a tangent plane tangent to a vertex on the aspheric optical axis).
z＝(cr2)/[1+{1-(k+1)(c2r2)}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).
Table 3 shows free-form surface data in the imaging optical lens 10 according to the first embodiment of the present invention.
[ TABLE 3 ]
Where k is a conic coefficient, Bi is a free-form surface coefficient, r is a perpendicular distance between a point on the free-form surface and the optical axis, x is an x-direction component of r, y is a y-direction component of r, and z is an aspheric depth (a perpendicular distance between a point on the aspheric surface at a distance of r from the optical axis and a tangent plane tangent to a vertex on the aspheric optical axis).
For convenience, each free-form surface uses an extended polynomial surface type (extensedpolynomial) shown in the above formula (2). However, the present invention is not limited to the free-form surface polynomial form expressed by this formula (2).
Fig. 2 shows a case where the RMS spot diameter of the imaging optical lens 10 of the first embodiment is in the first quadrant, and it can be seen from fig. 2 that the imaging optical lens 10 of the first embodiment can achieve good image quality.
Table 16 appearing later shows values corresponding to the parameters specified in the conditional expressions for the respective numerical values in examples 1, 2, 3, 4, and 5.
As shown in table 16, the first embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter ENPD of 2.669mm, a full field image height (diagonal direction) IH of 8.000mm, an x-direction image height of 6.400mm, and a y-direction image height of 4.800mm, and has the best imaging effect in this rectangular range, a diagonal field angle FOV of 76.65 °, an x-direction field angle of 68.24 °, a y-direction field angle of 53.76 °, 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 4 and 5 show design data of the imaging optical lens 20 according to the second embodiment of the present invention. The object-side surface and the image-side surface of the sixth lens element L6 are free-form surfaces.
[ TABLE 4 ]
Table 5 shows aspherical surface data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 5 ]
Table 6 shows free-form surface data in the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 6 ]
Fig. 4 shows a case where the RMS spot diameter of the imaging optical lens 20 of the second embodiment is in the first quadrant, and it can be seen from fig. 4 that the imaging optical lens 20 of the second embodiment can achieve good image quality.
As shown in table 16, the second embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter ENPD of 2.686mm, a full field image height (diagonal direction) IH of 8.000mm, an x-direction image height of 6.400mm, and a y-direction image height of 4.800mm, and has the best imaging effect in this rectangular range, a diagonal field angle FOV of 78.94 °, an x-direction field angle of 67.58 °, a y-direction field angle of 53.34 °, a wide angle and an ultra-thin profile, and its on-axis and off-axis chromatic aberration is sufficiently corrected, and has excellent optical characteristics.
(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 7 and 8 show design data of the imaging optical lens 30 according to the third embodiment of the present invention. The object-side surface and the image-side surface of the second lens L2 are free-form surfaces.
[ TABLE 7 ]
Table 8 shows aspherical surface data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.
[ TABLE 8 ]
Table 9 shows free-form surface data in the imaging optical lens 30 according to the third embodiment of the present invention.
[ TABLE 9 ]
Fig. 6 shows a case where the RMS spot diameter of the imaging optical lens 30 of the third embodiment is in the first quadrant, and it can be seen from fig. 6 that the imaging optical lens 30 of the third embodiment can achieve good image quality.
Table 16 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 ENPD of 2.979mm, a full field image height (diagonal direction) IH of 8.000mm, an x-direction image height of 6.400mm, and a y-direction image height of 4.800mm, and has the best imaging effect in this rectangular range, a diagonal field angle FOV of 76.96 °, an x-direction field angle of 65.24 °, a y-direction field angle of 51.26 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
(fourth embodiment)
The fourth embodiment is basically the same as the first embodiment, and the same reference numerals as in the first embodiment, and only different points will be described below.
Tables 10 and 11 show design data of the imaging optical lens 40 according to the fourth embodiment of the present invention. The object-side surface and the image-side surface of the sixth lens element L6 are free-form surfaces.
[ TABLE 10 ]
Table 11 shows aspherical surface data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.
[ TABLE 11 ]
Table 12 shows free-form surface data in the imaging optical lens 40 according to the fourth embodiment of the present invention.
[ TABLE 12 ]
Fig. 8 shows a case where the RMS spot diameter of the imaging optical lens 40 of the fourth embodiment is in the first quadrant, and it can be seen from fig. 8 that the imaging optical lens 40 of the fourth embodiment can achieve good image quality.
Table 16 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 ENPD of 2.669mm, a full field image height (diagonal direction) IH of 7.660mm, an x-direction image height of 6.120mm, and a y-direction image height of 4.600mm, and has the best imaging effect in this rectangular range, a diagonal field angle FOV of 71.27 °, an x-direction field angle of 60.06 °, a y-direction field angle of 46.60 °, a wide angle, and a thin profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
(fifth embodiment)
The fifth 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 13 and 14 show design data of the imaging optical lens 50 according to the fifth embodiment of the present invention. The object-side surface and the image-side surface of the fourth lens L4 are free-form surfaces.
[ TABLE 13 ]
Table 14 shows aspherical surface data of each lens in the imaging optical lens 50 according to the fifth embodiment of the present invention.
[ TABLE 14 ]
Table 15 shows free-form surface data in the imaging optical lens 50 according to the fifth embodiment of the present invention.
[ TABLE 15 ]
Fig. 10 shows a case where the RMS spot diameter of the imaging optical lens 50 of the fifth embodiment is in the first quadrant, and it can be seen from fig. 10 that the imaging optical lens 50 of the fifth embodiment can achieve good image quality.
Table 16 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 ENPD of 2.659mm, a full field image height (diagonal direction) IH of 7.660mm, an x-direction image height of 6.120mm, and a y-direction image height of 4.600mm, and has the best imaging effect in this rectangular range, a diagonal field angle FOV of 72.54 °, an x-direction field angle of 60.11 °, a y-direction field angle of 46.57 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
[ TABLE 16 ]
| Parameter and condition formula | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| f | 4.670 | 4.701 | 4.916 | 5.338 | 5.319 |
| f1 | 4.411 | 4.225 | 4.407 | 4.027 | 4.028 |
| f2 | -12.357 | -13.156 | -12.683 | -8.264 | -8.243 |
| f3 | 148.774 | 7617.035 | 9.373 | 4.516 | 4.517 |
| f4 | -33.910 | -46.848 | -7.127 | -9.873 | -9.877 |
| f5 | 3.136 | 3.052 | 7.039 | 9.119 | 9.163 |
| f6 | -2.506 | -2.395 | -5.869 | -3.508 | -3.604 |
| Fno | 1.75 | 1.75 | 1.65 | 2.00 | 2.00 |
Where Fno is the F-number of the diaphragm of the imaging optical lens.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific embodiments for practicing the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (10)
1. An imaging optical lens, in order from an object side to an image side, comprising: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens;
at least one of the first to sixth lenses has a free-form surface, a focal length of the first lens is f1, a focal length of the second lens is f2, a focal length of the third lens is f3, a focal length of the fourth lens is f4, and the following relationships are satisfied:
f1≥0.00；
f2≤0.00；
f3≥0.00；
f4≤0.00。
2. the imaging optical lens according to claim 1, wherein a ratio of a focal length f1 of the first lens to a focal length f3 of the third lens satisfies the following relationship:
0.00≤f1/f3≤1.00。
3. the image-capturing optical lens of claim 1, wherein the image-capturing optical lens has a focal length f, a radius of curvature of the object-side surface of the first lens element is R1, a radius of curvature of the image-side surface of the first lens element is R2, an on-axis thickness of the first lens element is d1, and an optical total length TTL satisfies the following relationship:
0.38≤f1/f≤1.42；
-3.44≤(R1+R2)/(R1-R2)≤-0.48；
0.08≤d1/TTL≤0.30。
4. the image-capturing optical lens of claim 1, wherein the image-capturing optical lens has a focal length f, a radius of curvature of the object-side surface of the second lens element is R3, a radius of curvature of the image-side surface of the second lens element is R4, an on-axis thickness of the second lens element is d3, and the image-capturing optical lens has a total optical length TTL and satisfies the following relationship:
-5.60≤f2/f≤-1.03；
1.08≤(R3+R4)/(R3-R4)≤5.82；
0.02≤d3/TTL≤0.07。
5. the image-capturing optical lens of claim 1, wherein the focal length of the image-capturing optical lens is f, 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, the total optical length of the image-capturing optical lens is TTL, and the following relationships are satisfied:
0.42≤f3/f≤2430.45；
-20.34≤(R5+R6)/(R5-R6)≤598.19；
0.03≤d5/TTL≤0.36。
6. the image-capturing optical lens unit according to claim 1, wherein the image-capturing optical lens unit has a focal length f, a radius of curvature of the object-side surface of the fourth lens element is R7, a radius of curvature of the image-side surface of the fourth lens element is R8, an on-axis thickness of the fourth lens element is d7, and the image-capturing optical lens unit has a total optical length TTL satisfying the following relationship:
-19.93≤f4/f≤-0.97；
-2.51≤(R7+R8)/(R7-R8)≤10.54；
0.03≤d7/TTL≤0.09。
7. the imaging optical lens of claim 1, wherein the focal length of the imaging optical lens is f, the focal length of the fifth lens is f5, the radius of curvature of the object-side surface of the fifth lens is R9, the radius of curvature of the image-side surface of the fifth lens is R10, the on-axis thickness of the fifth lens is d9, the total optical length of the imaging optical lens is TTL, and the following relationships are satisfied:
0.32≤f5/f≤2.58；
-3.08≤(R9+R10)/(R9-R10)≤2.00；
0.02≤d9/TTL≤0.25。
8. the imaging optical lens of claim 1, wherein the focal length of the imaging optical lens is f, the focal length of the sixth lens is f6, the radius of curvature of the object-side surface of the sixth lens is R11, the radius of curvature of the image-side surface of the sixth lens is R12, the on-axis thickness of the sixth lens is d11, the total optical length of the imaging optical lens is TTL, and the following relationships are satisfied:
-2.39≤f6/f≤-0.34；
0.22≤(R11+R12)/(R11-R12)≤3.37；
0.02≤d11/TTL≤0.17。
9. an image-capturing optical lens according to claim 1, characterized in that the F-number of the aperture of the image-capturing optical lens is Fno and satisfies the following relation:
Fno≤2.06。
10. the imaging optical lens according to claim 1, wherein an optical total length of the imaging optical lens is TTL, a full field of view height in a diagonal direction of the imaging optical lens is IH, and the following relationship is satisfied:
TTL/IH≤0.91。
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| CN113454512B (en) * | 2020-05-30 | 2022-05-31 | 华为技术有限公司 | Optical lens, camera module and electronic equipment |
| EP4134723A4 (en) * | 2020-05-30 | 2023-10-18 | Huawei Technologies Co., Ltd. | Optical lens, camera module, and electronic device |
| JP2022032923A (en) * | 2020-08-12 | 2022-02-25 | エーエーシー オプティクス （チャンジョウ）カンパニーリミテッド | Imaging optical lens |
| JP7104771B2 (en) | 2020-08-12 | 2022-07-21 | エーエーシー オプティクス （チャンジョウ）カンパニーリミテッド | Imaging optical lens |
| JP7061661B2 (en) | 2020-08-12 | 2022-04-28 | エーエーシー オプティクス （チャンジョウ）カンパニーリミテッド | Imaging optical lens |
| JP2022032922A (en) * | 2020-08-12 | 2022-02-25 | エーエーシー オプティクス （チャンジョウ）カンパニーリミテッド | Image capturing optical lens |
| WO2022247713A1 (en) * | 2021-05-25 | 2022-12-01 | 华为技术有限公司 | Optical lens, lens module, and electronic device |
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| CN111045193B (en) | 2022-07-08 |
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