CN111142218A - Image pickup optical lens - Google Patents
Image pickup optical lens Download PDFInfo
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- CN111142218A CN111142218A CN201911289936.XA CN201911289936A CN111142218A CN 111142218 A CN111142218 A CN 111142218A CN 201911289936 A CN201911289936 A CN 201911289936A CN 111142218 A CN111142218 A CN 111142218A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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Abstract
The invention relates to the field of optical lenses, and discloses an image pickup optical lens, which sequentially comprises the following components from an object side to an image side: a first lens element with negative refractive power, a second lens element with positive refractive power, a third lens element with positive refractive power, a fourth lens element with negative refractive power, a fifth lens element with positive refractive power, and a sixth lens element with negative refractive power; the 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 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, 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 relational expressions are satisfied: f1/f is not less than 3.50 and not more than-2.00; f2/f is more than or equal to 1.25 and less than or equal to 1.80; 1.00-2.00 (R11+ R12)/(R11-R12); d9/d10 is more than or equal to 7.00 and less than or equal to 15.50. The camera optical lens provided by the invention has good optical performance, and meets the design requirements of large aperture, wide angle and ultra-thinness.
Description
Technical Field
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) Sensor, and due to the advanced semiconductor manufacturing process technology, the pixel size of the photosensitive devices is reduced, and in addition, the current electronic products are developed with a good function, a light weight, a small size and a light weight, so that the miniaturized camera lenses with good imaging quality are the mainstream in the current market. In order to obtain better imaging quality, the lens mounted on the mobile phone camera conventionally adopts a three-piece or four-piece lens structure. Moreover, with the development of technology and the increase of diversified demands of users, under the condition that the pixel area of the photosensitive device is continuously reduced and the requirement of the system on the imaging quality is continuously improved, five-piece, six-piece and seven-piece lens structures gradually appear in the design of the lens. A wide-angle imaging lens having excellent optical characteristics, being ultra-thin and having sufficient chromatic aberration correction is in demand.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an imaging optical lens that has good optical performance and satisfies design requirements for a large aperture, ultra-thin thickness, and wide angle.
To solve the above-mentioned problems, an embodiment of the present invention provides an imaging optical lens, in order from an object side to an image side, comprising: a first lens element with negative refractive power, a second lens element with positive refractive power, a third lens element with positive refractive power, a fourth lens element with negative refractive power, a fifth lens element with positive refractive power, and a sixth lens element with negative refractive power;
the 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 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, 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 relational expression is satisfied: f1/f is not less than 3.50 and not more than-2.00; f2/f is more than or equal to 1.25 and less than or equal to 1.80; 1.00-2.00 (R11+ R12)/(R11-R12); d9/d10 is more than or equal to 7.00 and less than or equal to 15.50.
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: 0.05-5.00 (R7+ R8)/(R7-R8).
Preferably, the on-axis thickness of the second lens is d3, the on-axis distance from the image-side surface of the second lens to the object-side surface of the third lens is d4, and the following relation is satisfied: d3/d4 is more than or equal to 1.50 and less than or equal to 4.50.
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: -3.46 ≤ (R1+ R2)/(R1-R2) 1.45; d1/TTL is more than or equal to 0.03 and less than or equal to 0.24.
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: -3.21 ≤ (R3+ R4)/(R3-R4) ≤ 0.59; d3/TTL is more than or equal to 0.03 and less than or equal to 0.14.
Preferably, the focal length of the third lens element is f3, the radius of curvature of the object-side surface of the third lens element is R5, the radius of curvature of the image-side surface of the third lens element is R6, the on-axis thickness of the third lens element is d5, the total optical length of the image pickup optical lens is TTL, and the following relationships are satisfied: f3/f is more than or equal to 0.65 and less than or equal to 3.91; (R5+ R6)/(R5-R6) is not more than 0.41 and not more than 2.17; d5/TTL is more than or equal to 0.04 and less than or equal to 0.17.
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 more than or equal to-12.09 and less than or equal to-0.96; d7/TTL is more than or equal to 0.02 and less than or equal to 0.07.
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 0.30 and less than or equal to 1.07; (R9+ R10)/(R9-R10) is not more than 0.58 and not more than 2.53; d9/TTL is more than or equal to 0.05 and less than or equal to 0.33.
Preferably, the focal length of the sixth lens element is f6, the on-axis thickness of the sixth lens element is d11, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied: f6/f is not less than 1.57 and not more than-0.46; d11/TTL is more than or equal to 0.03 and less than or equal to 0.12.
Preferably, the image height of the image pickup optical lens is IH, the total optical length of the image pickup optical lens is TTL, and the following relation is satisfied: TTL/IH is less than or equal to 2.20.
The invention has the beneficial effects that: the imaging optical lens according to the present invention has excellent optical characteristics, and has characteristics of a large aperture, a wide angle of view, and an ultra-thin profile, and is particularly suitable for a mobile phone camera lens module and a WEB camera lens which are constituted by high-pixel imaging elements such as CCDs and CMOSs.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
fig. 1 is a schematic configuration diagram of an imaging optical lens according to a first embodiment 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 of FIG. 9;
fig. 13 is a schematic configuration diagram of an imaging optical lens according to a fourth embodiment of the present invention;
fig. 14 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 13;
fig. 15 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 13;
fig. 16 is a schematic view of curvature of field and distortion of the imaging optical lens shown in fig. 13.
Detailed Description
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 diaphragm S1, 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 negative refractive power, the second lens element L2 with positive 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 the present embodiment, the focal length of the imaging optical lens 10 is defined as f, and the focal length of the first lens L1 is defined as f1, and the following relational expression is satisfied: f1/f is more than or equal to 3.50 and less than or equal to-2.00, and the ratio of the focal length of the first lens to the total focal length is specified, so that the spherical aberration is reduced and the imaging quality is improved within a condition range. Preferably, it satisfies-3.49. ltoreq. f 1/f. ltoreq-2.02.
Defining the focal length f of the image pickup optical lens 10 and the focal length f2 of the second lens L2, the following relations are satisfied: f2/f is more than or equal to 1.25 and less than or equal to 1.80, the ratio of the focal length of the second lens to the focal length of the system is specified, and the performance of the optical system is improved in a conditional expression range. Preferably, 1.26. ltoreq. f 2/f. ltoreq.1.79 is satisfied.
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: the shape of the sixth lens is regulated to be not less than 1.00 (R11+ R12)/(R11-R12) not more than 2.00, and the deflection degree of light rays passing through the lens can be alleviated within the range regulated by the conditional expression, so that the aberration can be effectively reduced. Preferably, 1.03 ≦ (R11+ R12)/(R11-R12) ≦ 1.92.
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 7.00 and less than or equal to 15.50, and when d9/d10 meets the conditions, the processing and assembling difficulty of the lens can be effectively reduced. Preferably, 7.23 ≦ d9/d10 ≦ 15.36.
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 is regulated to be not less than 0.05 (R7+ R8)/(R7-R8) and not more than 5.00, the deflection degree of light rays passing through the lens can be alleviated within the range specified by the conditional expression, the aberration can be effectively reduced, and the requirements of not less than 0.05 (R7+ R8)/(R7-R8) and not more than 4.95 are met.
Defining the on-axis thickness of the second lens L2 as d3, and the on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3 as d4, the following relationships are satisfied: 1.50 is less than or equal to d3/d4 is less than or equal to 4.50, and when d3/d4 meets the condition, the total length of the compression system is facilitated. Preferably, 1.51. ltoreq. d3/d 4. ltoreq.4.27 is satisfied.
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: 3.46 ≦ (R1+ R2)/(R1-R2) ≦ 1.45, 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-2.16 ≦ (R1+ R2)/(R1-R2) ≦ 1.16.
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 relations are satisfied: d1/TTL is more than or equal to 0.03 and less than or equal to 0.24, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 1/TTL. ltoreq.0.19 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: -3.21 ≦ (R3+ R4)/(R3-R4) ≦ -0.59, and defines the shape of the second lens L2 in a range in which the chromatic aberration on the axis is favorably corrected as the lens advances to an ultra-thin wide angle, preferably satisfying-2.00 ≦ (R3+ R4)/(R3-R4) ≦ -0.74.
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 relations are satisfied: d3/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 3/TTL. ltoreq.0.11 is satisfied.
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 0.65 and less than or equal to 3.91, and the system has better imaging quality and lower sensitivity through reasonable distribution of focal power. Preferably, 1.04. ltoreq. f 3/f. ltoreq.3.13 is satisfied.
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 relational expression is satisfied: the shape of the third lens is more than or equal to 0.41 and less than or equal to (R5+ R6)/(R5-R6) and less than or equal to 2.17, and the deflection degree of the light rays passing through the lens can be alleviated within the range specified by the conditional expression, so that the aberration can be effectively reduced. Preferably, 0.66. ltoreq. (R5+ R6)/(R5-R6). ltoreq.1.73 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 relations are satisfied: d5/TTL is more than or equal to 0.04 and less than or equal to 0.17, and ultra-thinning is facilitated. Preferably, 0.06. ltoreq. d 5/TTL. ltoreq.0.13 is satisfied.
Defining the focal length f of the image pickup optical lens 10 and the focal length f4 of the fourth lens L4, the following relations are satisfied: 12.09 f4/f is less than or equal to-0.96, and the ratio of the focal length of the fourth lens to the focal length of the system is specified, so that the performance of the optical system is improved within the conditional expression range. Preferably, it satisfies-7.55. ltoreq. f 4/f. ltoreq-1.20.
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 relations are satisfied: d7/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 7/TTL. ltoreq.0.06 is satisfied.
Defining the focal length f of the image pickup optical lens 10 and the focal length f5 of the fifth lens L5, the following relations are satisfied: f5/f is more than or equal to 0.30 and less than or equal to 1.07. The definition of the fifth lens L5 can effectively make the light ray angle of the camera lens smooth, and reduce tolerance sensitivity. Preferably, 0.48. ltoreq. f 5/f. ltoreq.0.86 is satisfied.
The curvature radius of the object side surface of the fifth lens L5 is R9, the curvature radius of the image side surface of the fifth lens L5 is R10, and the following relational expression is satisfied: the shape of the fifth lens L5 is defined to be not less than 0.58 (R9+ R10)/(R9-R10) and not more than 2.53, 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, 0.92. ltoreq. (R9+ R10)/(R9-R10). ltoreq.2.03 is satisfied.
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 0.05 and less than or equal to 0.33, and ultra-thinning is facilitated. Preferably, 0.08. ltoreq. d 9/TTL. ltoreq.0.26 is satisfied.
Defining the focal length f of the image pickup optical lens 10 and the focal length f6 of the sixth lens L6, the following relations are satisfied: 1.57 ≦ f6/f ≦ -0.46, allowing better imaging quality and lower sensitivity of the system through reasonable distribution of optical power. Preferably, it satisfies-0.98. ltoreq. f 6/f. ltoreq-0.57.
The sixth lens L6 has an on-axis thickness d11, and satisfies the following relation: d11/TTL is more than or equal to 0.03 and less than or equal to 0.12, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 11/TTL. ltoreq.0.10 is satisfied.
The image height of the imaging optical lens 10 is defined as IH, and the following relation is satisfied: TTL/IH is less than or equal to 2.20, thereby realizing ultra-thinning.
In the present embodiment, the number of apertures F of the imaging optical lens 10 is 2.20 or less. The large aperture is large, and the imaging performance is good.
In the present embodiment, the field angle FOV of the imaging optical lens 10 is equal to or larger than 105 °, thereby achieving a wide angle.
When the above relationship is satisfied, the imaging optical lens 10 has good optical performance, and can satisfy design requirements of large aperture, wide angle and ultra-thinness; in accordance with the characteristics of the optical lens 10, the optical lens 10 is particularly suitable for a mobile phone camera lens module and a WEB camera lens which are configured by image pickup devices such as a high-pixel CCD and a CMOS.
The image pickup optical lens 10 of the present invention will be explained below by way of example. The symbols described in the respective examples are as follows. The unit of focal length, on-axis distance, curvature radius, on-axis thickness, position of reverse curvature and position of stagnation point is mm.
TTL: 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;
r15: radius of curvature of the object side of the optical filter GF;
r16: the radius of curvature of the image-side surface of the optical filter GF;
d: an on-axis thickness of the lenses and an on-axis distance between the lenses;
d 0: the on-axis distance of the stop S1 to the object-side surface of the first lens L1;
d 1: the on-axis thickness of the first lens L1;
d 2: the on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2;
d 3: the on-axis thickness of the second lens L2;
d 4: the on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;
d 5: the on-axis thickness of the third lens L3;
d 6: the on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4;
d 7: the on-axis thickness of the fourth lens L4;
d 8: an on-axis distance from an image-side surface of the fourth lens L4 to an object-side surface of the fifth lens L5;
d 9: the on-axis thickness of the fifth lens L5;
d 10: an on-axis distance from an image-side surface of the fifth lens L5 to an object-side surface of the sixth lens L6;
d 11: the on-axis thickness of the sixth lens L6;
d 12: the on-axis distance from the image-side surface of the sixth lens L6 to the object-side surface of the optical filter GF;
d 13: on-axis thickness of the optical filter GF;
d 14: the on-axis distance from the image side surface of the optical filter GF to the image surface;
nd: the refractive index of the d-line;
nd 1: the refractive index of the d-line of the first lens L1;
nd 2: the refractive index of the d-line of the second lens L2;
nd 3: the refractive index of the d-line of the third lens L3;
nd 4: the refractive index of the d-line of the fourth lens L4;
nd 5: the refractive index of the d-line of the fifth lens L5;
nd 6: the refractive index of the d-line of the sixth lens L6;
ndg: the refractive index of the d-line of the optical filter GF;
vd: an Abbe number;
v 1: abbe number of the first lens L1;
v 2: abbe number of the second lens L2;
v 3: abbe number of the third lens L3;
v 4: abbe number of the fourth lens L4;
v 5: abbe number of the fifth lens L5;
v 6: abbe number of the sixth lens L6;
vg: abbe number of the optical filter GF.
Table 2 shows aspherical surface data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention.
[ TABLE 2 ]
Wherein k is a conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18, A20 are aspheric coefficients.
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. P1R1 and P1R2 represent the object-side surface and the image-side surface of the first lens L1, P2R1 and P2R2 represent the object-side surface and the image-side surface of the second lens L2, P3R1 and P3R2 represent the object-side surface and the image-side surface of the third lens L3, P4R1 and P4R2 represent the object-side surface and the image-side surface of the fourth lens L4, P5R1 and P5R2 represent the object-side surface and the image-side surface of the fifth lens L5, and P6R1 and P6R2 represent the object-side surface and the image-side surface of the sixth lens L6, respectively. The "inflection point position" field correspondence data is a vertical distance from an inflection point set on each lens surface to the optical axis of the image pickup optical lens 10. The "stagnation point position" field corresponding data is the vertical distance from the stagnation point set on each lens surface to the optical axis of the imaging optical lens 10.
[ TABLE 3 ]
[ TABLE 4 ]
| Number of stagnation points | Location of stagnation 1 | Location of stagnation 2 | |
| P1R1 | 1 | 1.495 | |
| P1R2 | 1 | 0.415 | |
| |
0 | ||
| |
0 | ||
| |
0 | ||
| |
0 | ||
| |
0 | ||
| P4R2 | 1 | 0.595 | |
| |
0 | ||
| |
0 | ||
| P6R1 | 2 | 0.715 | 2.025 |
| P6R2 | 1 | 1.495 |
Fig. 2 and 3 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm, respectively, after passing through the imaging optical lens 10 according to the first embodiment. Fig. 4 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 10 according to the first embodiment, where S is curvature of field in the sagittal direction and T is curvature of field in the tangential direction in fig. 4.
Table 17 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 17, the first embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 0.941mm, a full field image height of 2.91mm, a diagonal field angle of 120.00 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
(second embodiment)
The second embodiment is basically the same as the first embodiment, the same reference numerals as in the first embodiment, and only different points will be described below.
Tables 5 and 6 show design data of the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 5 ]
Table 6 shows aspherical surface data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 6 ]
Tables 7 and 8 show the inflection point and stagnation point design data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.
[ TABLE 7 ]
| Number of points of inflection | Position of reverse curvature 1 | Position of reverse curvature 2 | Position of reverse curvature 3 | |
| P1R1 | 2 | 0.075 | 1.355 | |
| P1R2 | 2 | 1.035 | 1.115 | |
| |
0 | |||
| |
0 | |||
| P3R1 | 1 | 0.145 | ||
| |
0 | |||
| P4R1 | 1 | 0.195 | ||
| P4R2 | 2 | 0.405 | 0.935 | |
| P5R1 | 3 | 0.595 | 0.645 | 0.975 |
| P5R2 | 1 | 1.045 | ||
| P6R1 | 2 | 0.315 | 1.505 | |
| P6R2 | 2 | 0.485 | 2.305 |
[ TABLE 8 ]
| Number of stagnation points | Location of stagnation 1 | |
| P1R1 | 1 | 0.115 |
| |
0 | |
| |
0 | |
| |
0 | |
| P3R1 | 1 | 0.235 |
| |
0 | |
| P4R1 | 1 | 0.335 |
| P4R2 | 1 | 0.755 |
| |
0 | |
| |
0 | |
| P6R1 | 1 | 0.605 |
| P6R2 | 1 | 1.395 |
Fig. 6 and 7 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm0, respectively, after passing through the imaging optical lens 20 according to the second embodiment. Fig. 8 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 20 according to the second embodiment.
As shown in table 17, the second embodiment satisfies each conditional expression.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 0.993mm, a full field image height of 2.91mm, a diagonal field angle of 115.60 °, 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 | Position of reverse curvature 3 | |
| P1R1 | 2 | 0.145 | 1.255 | |
| P1R2 | 1 | 0.985 | ||
| P2R1 | 1 | 0.635 | ||
| |
0 | |||
| |
0 | |||
| P3R2 | 1 | 0.795 | ||
| |
0 | |||
| P4R2 | 2 | 0.225 | 0.795 | |
| |
0 | |||
| P5R2 | 2 | 0.875 | 1.325 | |
| P6R1 | 3 | 0.325 | 1.285 | 2.015 |
| P6R2 | 2 | 0.485 | 2.395 |
[ TABLE 12 ]
| Number of stagnation points | Location of stagnation 1 | |
| P1R1 | 1 | 0.245 |
| |
0 | |
| |
0 | |
| |
0 | |
| |
0 | |
| |
0 | |
| |
0 | |
| P4R2 | 1 | 0.425 |
| |
0 | |
| |
0 | |
| P6R1 | 1 | 0.605 |
| P6R2 | 1 | 1.415 |
Fig. 10 and 11 are schematic diagrams showing axial aberrations and chromatic aberration of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm 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 555nm after passing through the imaging optical lens 30 according to the third embodiment.
Table 17 below shows the numerical values corresponding to the respective conditional expressions in the present embodiment in accordance with the conditional expressions. Obviously, the imaging optical system of the present embodiment satisfies the above conditional expressions.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 1.103mm, a full field image height of 2.91mm, a diagonal field angle of 107.20 °, 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 13 and 14 show design data of the imaging optical lens 40 according to the fourth embodiment of the present invention.
[ TABLE 13 ]
Table 14 shows aspherical surface data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.
[ TABLE 14 ]
Tables 15 and 16 show the inflection points and the stagnation point design data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.
[ TABLE 15 ]
| Number of points of inflection | Position of reverse curvature 1 | Position of reverse curvature 2 | Position of reverse curvature 3 | |
| P1R1 | 2 | 0.665 | 2.795 | |
| P1R2 | 2 | 0.245 | 1.535 | |
| |
0 | |||
| |
0 | |||
| P3R1 | 1 | 0.065 | ||
| P3R2 | 1 | 0.845 | ||
| P4R1 | 2 | 0.855 | 0.945 | |
| P4R2 | 3 | 0.295 | 1.125 | 1.205 |
| P5R1 | 2 | 0.925 | 1.195 | |
| P5R2 | 2 | 0.785 | 1.365 | |
| P6R1 | 3 | 0.185 | 1.515 | 2.065 |
| P6R2 | 2 | 0.475 | 2.385 |
[ TABLE 16 ]
Fig. 14 and 15 are schematic diagrams showing axial aberrations and chromatic aberrations of magnification of light having wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm passing through the imaging optical lens 40 according to the fourth embodiment. Fig. 16 is a schematic view showing curvature of field and distortion of light having a wavelength of 555nm after passing through the imaging optical lens 40 according to the fourth embodiment.
Table 17 below shows the numerical values corresponding to the respective conditional expressions in the present embodiment in accordance with the conditional expressions. Obviously, the imaging optical system of the present embodiment satisfies the above conditional expressions.
In the present embodiment, the imaging optical lens has an entrance pupil diameter of 0.942mm, a full field image height of 2.91mm, a diagonal field angle of 120.00 °, a wide angle, and a high profile, and has excellent optical characteristics with on-axis and off-axis chromatic aberration sufficiently corrected.
[ TABLE 17 ]
| Parameter and condition formula | Example 1 | Example 2 | Example 3 | Example 4 |
| f1/f | -3.18 | -2.04 | -2.81 | -3.48 |
| f2/f | 1.66 | 1.60 | 1.26 | 1.77 |
| (R11+R12)/(R11-R12) | 1.40 | 1.84 | 1.58 | 1.05 |
| d9/d10 | 7.45 | 15.11 | 13.38 | 15.21 |
| f | 1.863 | 2.184 | 2.172 | 1.866 |
| f1 | -5.927 | -4.454 | -6.113 | -6.494 |
| f2 | 3.085 | 3.490 | 2.739 | 3.308 |
| f3 | 2.446 | 5.690 | 4.040 | 2.423 |
| f4 | -2.679 | -13.198 | -3.153 | -2.710 |
| f5 | 1.330 | 1.465 | 1.301 | 1.265 |
| f6 | -1.462 | -1.657 | -1.497 | -1.290 |
| f12 | 3.684 | 10.288 | 3.987 | 3.973 |
| Fno | 1.980 | 2.199 | 1.969 | 1.981 |
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: a first lens element with negative refractive power, a second lens element with positive refractive power, a third lens element with positive refractive power, a fourth lens element with negative refractive power, a fifth lens element with positive refractive power, and a sixth lens element with negative refractive power;
the 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 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, 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 relational expression is satisfied:
-3.50≤f1/f≤-2.00；
1.25≤f2/f≤1.80；
1.00≤(R11+R12)/(R11-R12)≤2.00；
7.00≤d9/d10≤15.50。
2. the imaging optical lens of claim 1, wherein the fourth lens object-side surface has a radius of curvature of R7, the fourth lens image-side surface has a radius of curvature of R8, and the following relationship is satisfied:
0.05≤(R7+R8)/(R7-R8)≤5.00。
3. the imaging optical lens according to claim 1, wherein an on-axis thickness of the second lens is d3, an on-axis distance from an image-side surface of the second lens to an object-side surface of the third lens is d4, and the following relationship is satisfied:
1.50≤d3/d4≤4.50。
4. 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:
-3.46≤(R1+R2)/(R1-R2)≤1.45；
0.03≤d1/TTL≤0.24。
5. the image-capturing optical lens unit according to claim 1, wherein the radius of curvature of the object-side surface of the second lens element is R3, the radius of curvature of the image-side surface of the second lens element is R4, the on-axis thickness of the second lens element is d3, the total optical length of the image-capturing optical lens unit is TTL, and the following relationships are satisfied:
-3.21≤(R3+R4)/(R3-R4)≤-0.59；
0.03≤d3/TTL≤0.14。
6. the imaging optical lens of claim 1, wherein the third lens has a focal length of f3, a radius of curvature of an object-side surface of the third lens is R5, a radius of curvature of an image-side surface of the third lens is R6, an on-axis thickness of the third lens is d5, and the imaging optical lens has a total optical length of TTL and satisfies the following relationship:
0.65≤f3/f≤3.91；
0.41≤(R5+R6)/(R5-R6)≤2.17；
0.04≤d5/TTL≤0.17。
7. 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:
-12.09≤f4/f≤-0.96；
0.02≤d7/TTL≤0.07。
8. 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:
0.30≤f5/f≤1.07；
0.58≤(R9+R10)/(R9-R10)≤2.53；
0.05≤d9/TTL≤0.33。
9. the image-capturing optical lens unit according to claim 1, wherein the sixth lens element has a focal length f6, an on-axis thickness d11, a total optical length TTL, and the following relationships are satisfied:
-1.57≤f6/f≤-0.46；
0.03≤d11/TTL≤0.12。
10. a camera optical lens according to claim 1, wherein the image height of the camera optical lens is IH, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied:
TTL/IH≤2.20。
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| JP6906675B1 (en) * | 2020-09-18 | 2021-07-21 | レイテック オプティカル （ジョウシュウ） カンパニーリミテッド | Imaging optical lens |
| JP6929004B1 (en) * | 2020-09-21 | 2021-09-01 | レイテック オプティカル （ジョウシュウ） カンパニーリミテッド | Imaging optical lens |
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