CN111025597B - Image pickup optical lens - Google Patents
Image pickup optical lens Download PDFInfo
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- CN111025597B CN111025597B CN201911401395.5A CN201911401395A CN111025597B CN 111025597 B CN111025597 B CN 111025597B CN 201911401395 A CN201911401395 A CN 201911401395A CN 111025597 B CN111025597 B CN 111025597B
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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
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 lens to the sixth lens includes a free-form surface, a focal length of the image pickup optical lens is f, a focal length of the first lens is f1, a focal length of the third lens is f3, and the following relations are satisfied: f3/f is more than or equal to 0.80 and less than or equal to 1.40; | f1/f | is more than or equal to 3.00. 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.
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: 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 lens to the sixth lens includes a free-form surface, a focal length of the image pickup optical lens is f, a focal length of the first lens is f1, a focal length of the third lens is f3, and the following relationships are satisfied: f3/f is more than or equal to 0.80 and less than or equal to 1.40; | f1/f | is more than or equal to 3.00.
Preferably, the on-axis thickness of the fifth lens is d9, the on-axis distance from the image-side surface of the fifth lens to the object-side surface of the sixth lens is d10, and the following relation is satisfied: d9/d10 is more than or equal to 1.00 and less than or equal to 30.00.
Preferably, the radius of curvature of the object-side surface of the fourth lens is R7, the radius of curvature of the image-side surface of the fourth lens is R8, and the following relationship is satisfied: 3.00 is less than or equal to (R7+ R8)/(R7-R8) is less than or equal to 8.00.
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, 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 relationship: -12.28 ≤ (R1+ R2)/(R1-R2) ≤ 1.42; d1/TTL is more than or equal to 0.05 and less than or equal to 0.16.
Preferably, the focal length of the second lens element is f2, the curvature radius of the object-side surface of the second lens element is R3, the curvature radius of the image-side surface of the second lens element is R4, the on-axis thickness of the second lens element is d3, the total optical length of the image pickup optical lens is TTL, and the following relationships are satisfied: -119.42 ≦ f2/f ≦ 158.82; -117.13 (R3+ R4)/(R3-R4) is less than or equal to 30.53; d3/TTL is more than or equal to 0.02 and less than or equal to 0.08.
Preferably, the curvature radius of the object-side surface of the third lens element is R5, the curvature radius 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 relationship: (R5+ R6)/(R5-R6) is not more than 0.22 and not more than 1.08; d5/TTL is more than or equal to 0.09 and less than or equal to 0.27.
Preferably, the focal length of the fourth lens is f4, the on-axis thickness of the fourth lens is d7, the total optical length of the image pickup optical lens is TTL, and the following relation is satisfied: f4/f is not less than 16.90 and not more than-1.37; d7/TTL is more than or equal to 0.02 and less than or equal to 0.06.
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 image pickup optical lens is TTL, and the following relationships are satisfied: f5/f is more than or equal to 0.59 and less than or equal to 2.17; (R9+ R10)/(R9-R10) is not more than 0.90 and not more than 5.34; d9/TTL is more than or equal to 0.06 and less than or equal to 0.20.
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, the total optical length of the imaging optical lens system is TTL, and the following relationships are satisfied: f6/f is not less than 4.00 and not more than-0.92; 1.76 is less than or equal to (R11+ R12)/(R11-R12) is less than or equal to 6.06; d11/TTL is more than or equal to 0.02 and less than or equal to 0.10.
Preferably, the F number of the diaphragm of the imaging optical lens is FNO, and satisfies the following relationship: FNO is less than or equal to 2.27.
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 first lens L1, a second lens L2, a diaphragm S1, 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 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.
The first lens L1 is made of plastic, the second lens L2 is made of plastic, the third lens L3 is made of glass, the fourth lens L4 is made of plastic, the fifth lens L5 is made of plastic, and the sixth lens L6 is made of plastic.
In this embodiment, at least one of the first lens L1 to the sixth lens L6 is defined to include a free-form surface, which contributes to aberration correction such as astigmatism, field curvature, and distortion of the wide-angle optical system.
Defining the focal length of the image pickup optical lens 10 as f, and the focal length of the third lens L3 as f3, the following relations are satisfied: f3/f is more than or equal to 0.80 and less than or equal to 1.40, the ratio of the focal length of the third lens to the total focal length is specified, and the aberration is reduced and the imaging quality is improved within a condition range. Preferably, 0.81. ltoreq. f 3/f. ltoreq.1.39 is satisfied.
Defining the focal length of the first lens L1 as f1, the following relation is satisfied: and | f1/f | is more than or equal to 3.00, and when | f1/f | meets the condition, the spherical aberration of the system is reduced, and the imaging quality is improved. Preferably, 3.33. ltoreq. f 1/f.
Defining the on-axis thickness of the fifth lens L5 as d9, and the on-axis distance from the image-side surface of the fifth lens L5 to the object-side surface of the sixth lens L6 as d10, the following relationships are satisfied: d9/d10 is more than or equal to 1.00 and less than or equal to 30.00, and when d9/d10 meets the condition, the total length of the system can be effectively compressed. Preferably, 1.56. ltoreq. d9/d 10. ltoreq. 29.69 is satisfied.
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: 3.00. ltoreq. R7+ R8)/(R7-R8. ltoreq.8.00, the shape of the fourth lens is defined so that the lens satisfying the conditions is favorable for reducing the degree of light deflection and reducing the sensitivity of the lens, and preferably, 3.19. ltoreq. R7+ R8)/(R7-R8. ltoreq.7.81.
The curvature radius of the object side surface of the first lens L1 is defined as R1, the curvature radius of the image side surface of the first lens L1 is defined as R2, and the following relational expressions are satisfied: 12.28 ≦ (R1+ R2)/(R1-R2) ≦ -1.42, 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-7.68 ≦ (R1+ R2)/(R1-R2) ≦ -1.77.
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 0.05 and less than or equal to 0.16, and ultra-thinning is facilitated. Preferably, 0.08. ltoreq. d 1/TTL. ltoreq.0.13 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: 119.42 ≦ f2/f ≦ 158.82, which is advantageous for correcting aberrations of the optical system by controlling the power of the second lens L2 within a reasonable range. Preferably, it satisfies-74.64 ≦ f2/f ≦ 127.05.
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: -117.13 ≦ (R3+ R4)/(R3-R4) ≦ 30.53, and the shape of the second lens L2 is defined so as to be favorable for correcting the chromatic aberration on the axis as the lens advances to an ultra-thin wide angle within the range, and preferably satisfies-73.21 ≦ (R3+ R4)/(R3-R4) ≦ 24.42.
The on-axis thickness of the second lens L2 is d3, the total optical length of the imaging optical lens system 10 is TTL, and the following relationship is satisfied: d3/TTL is more than or equal to 0.02 and less than or equal to 0.08, and ultra-thinning is facilitated. Preferably, 0.03. ltoreq. d 3/TTL. ltoreq.0.06 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 relations are satisfied: the (R5+ R6)/(R5-R6) is not more than 0.22 and not more than 1.08, the shape of the third lens L3 can be effectively controlled, the molding of the third lens L3 is facilitated, the deflection degree of light rays passing through the lens can be alleviated within the range specified by the conditional expression, and the aberration can be effectively reduced. Preferably, 0.35. ltoreq. R5+ R6)/(R5-R6. ltoreq.0.87 is satisfied.
The on-axis thickness of the third lens L3 is d5, the total optical length of the imaging optical lens system 10 is TTL, and the following relationship is satisfied: d5/TTL is more than or equal to 0.09 and less than or equal to 0.27, and ultra-thinning is facilitated. Preferably, 0.14. ltoreq. d 5/TTL. ltoreq.0.22 is satisfied.
Defining the focal length of the fourth lens element as f4 and the focal length of the image pickup optical lens assembly 10 as f, the following relations are satisfied: 16.90 ≦ f4/f ≦ -1.37, allowing better imaging quality and lower sensitivity of the system through reasonable distribution of optical power. Preferably, it satisfies-10.56. ltoreq. f 4/f. ltoreq-1.72.
The on-axis thickness of the fourth lens L4 is d7, the total optical length of the imaging optical lens system 10 is TTL, and the following relationship is satisfied: d7/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 7/TTL. ltoreq.0.04 is satisfied.
Defining the focal length of the fifth lens L5 as f5, and the focal length of the image pickup optical lens 10 as f, the following relations are satisfied: f5/f is more than or equal to 0.59 and less than or equal to 2.17, and the definition of the fifth lens L5 can effectively make the light ray angle of the camera lens smooth and reduce the tolerance sensitivity. Preferably, 0.95. ltoreq. f 5/f. ltoreq.1.74 is satisfied.
The radius of curvature of the object-side surface of the fifth lens element is R9, and the radius of curvature of the image-side surface of the fifth lens element is R10, and the following relationships are satisfied: the shape of the fifth lens L5 is defined to be not less than 0.90 (R9+ R10)/(R9-R10) and not more than 5.34, and when the shape is within the range, the aberration of the off-axis picture angle is favorably corrected along with the development of the ultrathin wide angle. Preferably, 1.44 ≦ (R9+ R10)/(R9-R10) ≦ 4.27.
The on-axis thickness of the fifth lens L5 is d9, the total optical length of the imaging optical lens system 10 is TTL, and the following relationship is satisfied: d9/TTL is more than or equal to 0.06 and less than or equal to 0.20, and ultra-thinning is facilitated. Preferably, 0.09. ltoreq. d 9/TTL. ltoreq.0.16 is satisfied.
Defining the focal length of the sixth lens L6 as f6 and the focal length of the image pickup optical lens 10 as f, the following relations are satisfied: 4.00 ≦ f6/f ≦ -0.92, allowing better imaging quality and lower sensitivity of the system through reasonable distribution of optical power. Preferably, it satisfies-2.50. ltoreq. f 6/f. ltoreq-1.16.
The curvature radius of the object side surface of the sixth lens is R11, the curvature radius of the image side surface of the sixth lens is R12, and the following relational expression is satisfied: 1.76 is not more than (R11+ R12)/(R11-R12) is not more than 6.06, and the shape of the sixth lens L6 is defined, and when the shape is within the condition range, the problem of aberration of off-axis picture angle is favorably corrected along with the development of ultra-thin wide-angle. Preferably, 2.81 ≦ (R11+ R12)/(R11-R12) ≦ 4.85 is satisfied.
The on-axis thickness of the sixth lens element L6 is d11, the total optical length of the imaging optical lens system 10 is TTL, and the following relationships are satisfied: d11/TTL is more than or equal to 0.02 and less than or equal to 0.10, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 11/TTL. ltoreq.0.08 is satisfied.
In the present embodiment, the number of the stop F of the imaging optical lens 10 is FNO, and the following relationship is satisfied: FNO is less than or equal to 2.27, large aperture and good imaging performance. Preferably, FNO is less than or equal to 2.22.
In this embodiment, the total optical length TTL of the image pickup optical lens 10 is less than or equal to 7.05 mm, which is beneficial to achieving ultra-thinning. Preferably, the total optical length TTL is less than or equal to 6.73 millimeters.
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, and a16 are aspheric coefficients, 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(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 (Extended Polynomial) 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 0.956mm, a full field image height (diagonal direction) IH of 6.720mm, an x-direction image height of 5.376mm, and a y-direction image height of 4.032mm, and has the best imaging effect in this rectangular range, a diagonal field angle FOV of 118.47 °, an x-direction field angle of 106.70 °, a y-direction field angle of 90.46 °, 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.
[ 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 1.1085mm, a full field image height (diagonal direction) IH of 7.580mm, an x-direction image height of 6.064mm, and a y-direction image height of 4.548mm, and has the best imaging effect in this rectangular range, a diagonal field angle FOV of 118.47 °, an x-direction field angle of 106.70 °, a y-direction field angle of 90.46 °, 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 7 and 8 show design data of the imaging optical lens 30 according to the third embodiment of the present invention.
[ 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 0.987mm, a full field image height (diagonal direction) IH of 7.140mm, an x-direction image height of 5.712mm, and a y-direction image height of 4.284mm, and has the best imaging effect in this rectangular range, a diagonal field angle FOV of 118.47 °, an x-direction field angle of 106.70 °, a y-direction field angle of 90.46 °, 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 second lens L2 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 0.9466mm, a full field image height (diagonal direction) IH of 6.720mm, an x-direction image height of 5.376mm, and a y-direction image height of 4.032mm, and has the best imaging effect in this rectangular range, a diagonal field angle FOV of 118.78 °, an x-direction field angle of 107.03 °, a y-direction field angle of 90.80 °, 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.
(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 third lens L3 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 fourth 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 0.949mm, a full field image height (diagonal direction) IH of 6.700mm, an x-direction image height of 5.360mm, and a y-direction image height of 4.020mm, and has the best imaging effect in this rectangular range, a diagonal field angle FOV of 118.47 °, an x-direction field angle of 106.70 °, a y-direction field angle of 90.46 °, 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 |
| f3/f | 0.97 | 0.81 | 1.37 | 0.95 | 0.94 |
| |f1/f| | 4.69 | 3.66 | 9.00 | 5.45 | 5.75 |
| f | 2.007 | 2.328 | 2.172 | 1.988 | 1.993 |
| f1 | -9.410 | -8.516 | -19.542 | -10.829 | -11.457 |
| f2 | -119.835 | -116.090 | -52.052 | 105.931 | 211.027 |
| f3 | 1.954 | 1.886 | 2.976 | 1.891 | 1.882 |
| f4 | -5.933 | -4.792 | -18.354 | -5.431 | -5.544 |
| f5 | 2.658 | 2.775 | 2.572 | 2.878 | 2.810 |
| f6 | -3.372 | -3.228 | -3.192 | -3.980 | -3.811 |
| Fno | 2.10 | 2.10 | 2.20 | 2.10 | 2.10 |
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 (9)
1. An imaging optical lens, comprising six lens elements 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;
the first lens element with negative refractive power, the third lens element with positive refractive power, the fourth lens element with negative refractive power, the fifth lens element with positive refractive power, and the sixth lens element with negative refractive power;
the object side surface of the first lens is a concave surface at the paraxial position, and the image side surface of the first lens is a convex surface at the paraxial position; the object side surface of the second lens is a convex surface at the paraxial position, and the image side surface of the second lens is a concave surface at the paraxial position; the object side surface of the third lens is convex at the paraxial part, and the image side surface of the third lens is convex at the paraxial part; the object side surface of the fourth lens is a convex surface at the paraxial position, and the image side surface of the fourth lens is a concave surface at the paraxial position; the object side surface of the fifth lens is a concave surface at the paraxial position, and the image side surface of the fifth lens is a convex surface at the paraxial position; the object side surface of the sixth lens is a convex surface at the paraxial region, and the image side surface of the sixth lens is a concave surface at the paraxial region;
at least one of the first lens element to the sixth lens element has a free-form surface, the imaging optical lens element has a focal length f, the first lens element has a focal length f1, the third lens element has a focal length f3, the fourth lens element has an object-side surface with a radius of curvature R7, and the fourth lens element has an image-side surface with a radius of curvature R8, and satisfies the following relationships:
0.80≤f3/f≤1.40；
3.00≤|f1/f|；
3.00≤(R7+R8)/(R7-R8)≤8.00。
2. the imaging optical lens according to claim 1, wherein an on-axis thickness of the fifth lens is d9, an on-axis distance from an image-side surface of the fifth lens to an object-side surface of the sixth lens is d10, and the following relational expression is satisfied:
1.00≤d9/d10≤30.00。
3. the image-capturing optical lens unit according to 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 on-axis thickness of the first lens element is d1, the total optical length of the image-capturing optical lens unit is TTL, and the following relationships are satisfied:
-12.28≤(R1+R2)/(R1-R2)≤-1.42；
0.05≤d1/TTL≤0.16。
4. the imaging optical lens of claim 1, wherein the second lens has a focal length of f2, a radius of curvature of an object-side surface of the second lens is R3, a radius of curvature of an image-side surface of the second lens is R4, an on-axis thickness of the second lens is d3, and an optical total length of the imaging optical lens is TTL and satisfies the following relationship:
-119.42≤f2/f≤158.82；
-117.13≤(R3+R4)/(R3-R4)≤30.53；
0.02≤d3/TTL≤0.08。
5. the image-capturing optical lens unit according to claim 1, wherein 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 unit is TTL, and the following relationships are satisfied:
0.22≤(R5+R6)/(R5-R6)≤1.08；
0.09≤d5/TTL≤0.27。
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:
-16.90≤f4/f≤-1.37；
0.02≤d7/TTL≤0.06。
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:
0.59≤f5/f≤2.17；
0.90≤(R9+R10)/(R9-R10)≤5.34；
0.06≤d9/TTL≤0.20。
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:
-4.00≤f6/f≤-0.92；
1.76≤(R11+R12)/(R11-R12)≤6.06；
0.02≤d11/TTL≤0.10。
9. an imaging optical lens according to claim 1, wherein the F-number of the aperture of the imaging optical lens is FNO, and the following relationship is satisfied:
FNO≤2.27。
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