CN110865449B - Image pickup optical lens - Google Patents
Image pickup optical lens Download PDFInfo
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- CN110865449B CN110865449B CN201911154547.6A CN201911154547A CN110865449B CN 110865449 B CN110865449 B CN 110865449B CN 201911154547 A CN201911154547 A CN 201911154547A CN 110865449 B CN110865449 B CN 110865449B
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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
Abstract
The invention provides an optical lens for shooting, which sequentially comprises the following components from an object side to an image side: a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power, and a fifth lens element with negative refractive power; the curvature radius of the object-side surface of the third lens is R5, the curvature radius of the image-side surface of the third lens is R6, the curvature radius of the object-side surface of the fourth lens is R7, the curvature radius of the image-side surface of the fourth lens is R8, the on-axis thickness of the first lens is d1, the on-axis distance from the image-side surface of the first lens to the object-side surface of the second lens is d2, and the following relations are satisfied: d1/d2 is more than or equal to 25.00 and less than or equal to 45.00; R5/R6 is more than or equal to 30.00 and less than or equal to 42.00; R7/R8 is more than or equal to 10.00 and less than or equal to 30.00. The photographic optical lens has good optical performance and also meets the design requirements of large aperture, wide angle and ultra-thinness.
Description
[ technical field ] A method for producing a semiconductor device
The present invention relates to the field of optical lenses, and more particularly, to an imaging optical lens suitable for portable terminal devices such as smart phones and digital cameras, and imaging apparatuses such as monitors and PC lenses.
[ background of the invention ]
In recent years, with the rise of smart phones, the demand of miniaturized camera lenses is increasing, and the photosensitive devices of general camera lenses are not limited to two types, namely, a Charge Coupled Device (CCD) or a Complementary Metal-oxide semiconductor (CMOS) Sensor, and due to the advanced semiconductor manufacturing process technology, the pixel size of the photosensitive devices is reduced, and in addition, the current electronic products are developed with a good function, a light weight, a small size and a light weight, so that the miniaturized camera lenses with good imaging quality are the mainstream in the current market.
In order to obtain better imaging quality, the lens mounted on the mobile phone camera conventionally adopts three-piece, four-piece, or even five-piece or six-piece lens structures. However, 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 for the imaging quality is continuously improved, the five-piece lens structure gradually appears in the lens design, although the common five-piece lens has good optical performance, the focal power, the lens interval and the lens shape setting still have certain irrationality, so that the design requirements of large aperture, ultra-thinning and wide-angle cannot be met while the lens structure has good optical performance.
[ summary of the invention ]
In view of the above problems, an object of the present invention is to provide an imaging optical lens that has good optical performance and satisfies design requirements for a large aperture, ultra-thin thickness, and wide angle.
The technical scheme of the invention is as follows: an imaging optical lens includes, in order from an object side to an image side: a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power, and a fifth lens element with negative refractive power; the curvature radius of the object-side surface of the third lens is R5, the curvature radius of the image-side surface of the third lens is R6, the curvature radius of the object-side surface of the fourth lens is R7, the curvature radius of the image-side surface of the fourth lens is R8, the on-axis thickness of the first lens is d1, the on-axis distance from the image-side surface of the first lens to the object-side surface of the second lens is d2, and the following relations are satisfied: d1/d2 is more than or equal to 25.00 and less than or equal to 45.00; R5/R6 is more than or equal to 30.00 and less than or equal to 42.00; R7/R8 is more than or equal to 10.00 and less than or equal to 30.00.
Preferably, the focal length of the entire imaging optical lens is f, and the following relational expression is satisfied: d1/f is more than or equal to 0.25 and less than or equal to 0.33.
Preferably, the radius of curvature of the object-side surface of the second lens is R3, the radius of curvature of the image-side surface of the second lens is R4, and the following relation is satisfied: R3/R4 is more than or equal to 1.30 and less than or equal to 2.00.
Preferably, the focal length of the entire imaging optical lens is f, the focal length of the first lens element is f1, 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, and the total optical length of the imaging optical lens is TTL and satisfies the following relationship: f1/f is more than or equal to 0.42 and less than or equal to 1.43; -3.39 ≤ (R1+ R2)/(R1-R2) is ≤ 1.00; d1/TTL is more than or equal to 0.11 and less than or equal to 0.38.
Preferably, the focal length of the entire imaging optical lens is f, the focal length of the second lens is f2, the radius of curvature of the object-side surface of the second lens is R3, the radius of curvature of the image-side surface of the second lens is R4, the on-axis thickness of the second lens is d3, the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: f2/f is more than or equal to minus 10.30 and less than or equal to minus 2.00; 1.50-8.09 of (R3+ R4)/(R3-R4); d3/TTL is more than or equal to 0.02 and less than or equal to 0.07.
Preferably, the focal length of the entire imaging optical lens is f, the focal length of the third lens is f3, the on-axis thickness of the third lens is d5, and the total optical length of the imaging optical lens is TTL and satisfies the following relation: f3/f is more than or equal to-8.56 and less than or equal to-2.63; (R5+ R6)/(R5-R6) is not more than 0.52 and not more than 1.60; d5/TTL is more than or equal to 0.03 and less than or equal to 0.11.
Preferably, the focal length of the entire image pickup optical lens is f, the focal length of the fourth lens is f4, the on-axis thickness of the fourth lens is d7, and the total optical length of the image pickup optical lens is TTL and satisfies the following relation: f4/f is more than or equal to 0.27 and less than or equal to 0.85; (R7+ R8)/(R7-R8) is not more than 0.54 and not more than 1.83; d7/TTL is more than or equal to 0.09 and less than or equal to 0.30.
Preferably, the focal length of the entire imaging optical lens is f, the focal length of the fifth lens element is f5, the radius of curvature of the object-side surface of the fifth lens element is R9, the radius of curvature of the image-side surface of the fifth lens element is R10, the on-axis thickness of the fifth lens element is d9, the total optical length of the imaging optical lens element is TTL, and the following relationships are satisfied: f5/f is more than or equal to-0.95 and less than or equal to-0.31; (R9+ R10)/(R9-R10) is not more than 0.23 and not more than 0.72; d9/TTL is more than or equal to 0.04 and less than or equal to 0.12.
Preferably, the F-number of the imaging optical lens is less than or equal to 2.28.
Preferably, the field angle of the imaging optical lens is FOV, and satisfies the following relation: the FOV is more than or equal to 77 degrees.
The invention has the beneficial effects that: the imaging optical lens according to the present invention has excellent optical performance, 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.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
fig. 1 is a schematic configuration diagram of an imaging optical lens according to a first embodiment;
fig. 2 is a schematic view of axial aberrations of the image-taking optical lens shown in fig. 1;
fig. 3 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 1;
FIG. 4 is a schematic view of curvature of field and distortion of the imaging optical lens shown in FIG. 1;
fig. 5 is a schematic configuration diagram of an imaging optical lens according to a second embodiment;
fig. 6 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 5;
fig. 7 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 5;
FIG. 8 is a schematic view of curvature of field and distortion of the imaging optical lens shown in FIG. 5;
fig. 9 is a schematic configuration diagram of an imaging optical lens according to a third embodiment;
fig. 10 is a schematic view of axial aberrations of the image pickup optical lens shown in fig. 9;
fig. 11 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in fig. 9;
fig. 12 is a schematic view of curvature of field and distortion of the imaging optical lens shown in fig. 9.
[ detailed description ] embodiments
The invention is further described with reference to the following figures and embodiments.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present invention in its various embodiments. However, the technical solution claimed in the present invention can be implemented without these technical details and various changes and modifications based on the following embodiments.
(embodiment I)
Referring to fig. 1 to 4, an imaging optical lens 10 according to a first embodiment of the present invention is provided. In fig. 1, the left side is an object side, the right side is an image side, and the imaging optical lens assembly 10 mainly includes five lenses, namely, an aperture stop S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5 in order from the object side to the image side. A glass flat GF is disposed between the fifth lens L5 and the image plane Si, and the glass flat GF may be a glass cover plate or an optical filter.
Here, it is defined that the focal length of the entire imaging optical lens 10 is f, the radius of curvature of the object-side surface of the third lens L3 is R5, the radius of curvature of the image-side surface of the third lens L3 is R6, the radius of curvature of the object-side surface of the fourth lens L4 is R7, the radius of curvature of the image-side surface of the fourth lens L4 is R8, the on-axis thickness of the first lens L1 is d1, and the on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2 is d2, and the following relational expressions are satisfied:
25.00≤d1/d2≤45.00 (1)
30.00≤R5/R6≤42.00 (2)
10.00≤R7/R8≤30.00 (3)
the conditional expression (1) specifies the ratio of the on-axis thickness d1 of the first lens L1 and the on-axis distance d2 between the image side surface of the first lens L1 and the object side surface of the second lens L2, and the imaging optical lens satisfying the conditions is favorable for balancing spherical aberration and improving the imaging quality. Preferably, the conditional expression 25.39. ltoreq. d1/d 2. ltoreq.44.74 is satisfied.
The conditional expression (2) specifies the ratio of the radii of curvature of the object-side surface and the image-side surface of the third lens L3, and is favorable for aberration correction within the range of the conditional expression. Preferably, the conditional formula 30.50. ltoreq. R5/R6. ltoreq.41.97 is satisfied.
The conditional expression (3) specifies the ratio of the radii of curvature of the object-side surface and the image-side surface of the fourth lens L4, and is favorable for lens processing within the range of the conditional expression. Preferably, the conditional formula 10.06. ltoreq. R7/R8. ltoreq.29.68 is satisfied.
In the present embodiment, the following relational expression is satisfied: d1/f is more than or equal to 0.25 and less than or equal to 0.33, and when d1/f meets the conditional expression, the size of the head of the system is favorably reduced. Preferably, the conditional expression 0.26. ltoreq. d 1/f. ltoreq.0.32 is satisfied.
In the present embodiment, the radius of curvature of the object-side surface of the second lens L2 is R3, and the radius of curvature of the image-side surface of the second lens L2 is R4, and the following relational expressions are satisfied: R3/R4 is more than or equal to 1.30 and less than or equal to 2.00, the shape of the second lens L2 is specified, and the light beam deflection degree is favorably reduced, the aberration is reduced, and the imaging quality is improved within a condition range. Preferably, the conditional formula 1.38. ltoreq. R3/R4. ltoreq.2.00 is satisfied.
In the present embodiment, the first lens element L1 has positive refractive power, and the focal length of the first lens element L1 is f1, which satisfies the following relation: f1/f is more than or equal to 0.42 and less than or equal to 1.43, and the ratio of the positive refractive power to the overall focal length of the first lens element L1 is defined. When the first lens element is within the specified range, the first lens element has proper positive refractive power, which is beneficial to reducing system aberration and is beneficial to the development of ultra-thinning and wide-angle lens. Preferably, the conditional expression 0.67. ltoreq. f 1/f. ltoreq.1.14 is satisfied.
The curvature radius of the object side surface of the first lens L1 is R1, the curvature radius of the image side surface of the first lens L1 is R2, and the following relations are satisfied: 3.39 ≦ (R1+ R2)/(R1-R2) ≦ -1.00, and the shape of the first lens L1 is controlled appropriately so that the first lens L1 can correct the system spherical aberration effectively. Preferably, the conditional formula-2.12 ≦ (R1+ R2)/(R1-R2) ≦ -1.24 is satisfied.
The on-axis thickness of the first lens L1 is d1, the total optical length of the imaging optical lens is TTL, and the following relational expression is satisfied: d1/TTL is more than or equal to 0.11 and less than or equal to 0.38, and ultra-thinning is facilitated. Preferably, 0.17. ltoreq. d 1/TTL. ltoreq.0.31.
In the present embodiment, the second lens element L2 has negative refractive power, the focal length of the entire imaging optical lens system 10 is f, the focal length of the second lens element L2 is f2, and the following relationship is satisfied: 10.30 f2/f 2.00, which is advantageous for correcting the aberration of the optical system by controlling the negative power of the second lens L2 in a reasonable range. Preferably-6.44. ltoreq. f 2/f. ltoreq-2.50.
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 relations are satisfied: the shape of the second lens L2 is defined to be not less than 1.50 (R3+ R4)/(R3-R4) and not more than 8.09, and the problem of chromatic aberration on the axis can be corrected favorably as the lens is brought to an ultra-thin wide angle within the range. Preferably, 2.40 ≦ (R3+ R4)/(R3-R4). ltoreq.6.47.
The on-axis thickness of the second lens L2 is d3, and satisfies the following relation: d3/TTL is more than or equal to 0.02 and less than or equal to 0.07, and ultra-thinning is facilitated. Preferably, 0.04. ltoreq. d 3/TTL. ltoreq.0.06.
In the present embodiment, the third lens element L3 has negative refractive power, the focal length of the entire imaging optical lens system is f, and the focal length of the third lens element L3 is f3, and the following relationships are satisfied: 8.56 ≦ f3/f ≦ -2.63, allowing better imaging quality and lower sensitivity of the system through reasonable distribution of optical power. Preferably-5.35. ltoreq. f 3/f. ltoreq-3.29.
The curvature radius of the object side surface of the third lens L3 is R5, the curvature radius of the image side surface of the third lens L3 is R6, and the following relations are satisfied: the shape of the third lens is more than or equal to 0.52 and less than or equal to (R5+ R6)/(R5-R6) and less than or equal to 1.60, 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, 0.84 ≦ (R5+ R6)/(R5-R6). ltoreq.1.28.
The on-axis thickness of the third lens L3 is d5, and satisfies the following relation: d5/TTL is more than or equal to 0.03 and less than or equal to 0.11, and ultra-thinning is facilitated. Preferably, 0.05. ltoreq. d 5/TTL. ltoreq.0.09.
The fourth lens element L4 with positive refractive power has a focal length f4 of the fourth lens element L4, which satisfies the following relationship: f4/f is more than or equal to 0.27 and less than or equal to 0.85, the ratio of the focal length of the fourth 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, 0.43. ltoreq. f 4/f. ltoreq.0.68.
The curvature radius of the object side surface of the fourth lens L4 is R7, the curvature radius of the image side surface of the fourth lens L4 is R8, and the following relations are satisfied: the shape of the fourth lens L4 is defined to be not less than 0.54 (R7+ R8)/(R7-R8) and not more than 1.83, and when the shape is within the range, the aberration of the off-axis picture angle is favorably corrected with the development of ultra-thin and wide-angle. Preferably, 0.86 ≦ (R7+ R8)/(R7-R8). ltoreq.1.46.
The on-axis thickness of the fourth lens L4 is d7, and satisfies the following relation: d7/TTL is more than or equal to 0.09 and less than or equal to 0.30, and ultra-thinning is facilitated. Preferably, 0.14 ≦ d7/TTL ≦ 0.24.
The fifth lens element L5 with negative refractive power has a focal length f5 of the fifth lens element L5, which satisfies the following relationship: f5/f is more than or equal to-0.31 and more than or equal to-0.95, and the definition of the fifth lens L5 can effectively make the light angle of the camera lens smooth and reduce the tolerance sensitivity. Preferably-0.59. ltoreq. f 5/f. ltoreq-0.39.
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 relations are satisfied: the (R9+ R10)/(R9-R10) is 0.23 or more and 0.72 or less, and the shape of the fifth lens L5 is defined so that the problem of aberration of an off-axis picture angle can be favorably corrected with the development of an ultra-thin wide angle within the range. Preferably, 0.36 ≦ (R9+ R10)/(R9-R10). ltoreq.0.57.
The fifth lens L5 has an on-axis thickness d9, and satisfies the following relationship: d9/TTL is more than or equal to 0.04 and less than or equal to 0.12, and ultra-thinning is facilitated. Preferably, 0.06 ≦ d9/TTL ≦ 0.09.
In the present embodiment, the aperture Fno of the imaging optical lens 10 is 2.28 or less. The large aperture is large, and the imaging performance is good. Preferably, the F-number is less than or equal to 2.25.
The angle of view of the imaging optical lens 10 in the present embodiment is greater than or equal to 78 °, thereby achieving a wide angle of the imaging optical lens.
When the focal length of the image pickup optical lens 10, the focal length of each lens and the curvature radius satisfy the above relational expression, the image pickup optical lens 10 can have good optical performance, and design requirements of a large aperture, a wide angle and ultra-thinness can be satisfied; in accordance with the characteristics of the optical lens 10, the optical lens 10 is particularly suitable for a mobile phone camera lens module and a WEB camera lens which are configured by image pickup devices such as a high-pixel CCD and a CMOS.
In this way, the imaging optical lens 10 can satisfy design requirements of a large aperture, a wide angle, and an ultra-thin structure while having good optical imaging performance.
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 is the optical length (on-axis distance from the object side surface of the 1 st lens L1 to the image plane) in mm;
preferably, the object side surface and/or the image side surface of the lens may be further provided with an inflection point and/or a stagnation point to meet the requirement of high-quality imaging.
The following shows design data of the image pickup optical lens 10 shown in fig. 1.
Table 1 shows the object-side and image-side radii of curvature R, the on-axis thicknesses of the respective lenses, the distances d between the adjacent lenses, the refractive indices nd, and the abbe numbers ν d of the first lens L1 to the fifth lens L5 constituting the imaging optical lens 10 according to the first embodiment of the present invention. In the present embodiment, R and d are both expressed in units of millimeters (mm).
[ TABLE 1 ]
The meanings of the symbols in the above table are as follows.
R: the radius of curvature of the optical surface and the radius of curvature of the lens as the center;
s1: an aperture;
r1 radius of curvature of object-side surface of first lens L1;
r2 radius of curvature of image side surface of first lens L1;
r3 radius of curvature of object-side surface of second lens L2;
r4 radius of curvature of the image-side surface of the second lens L2;
r5 radius of curvature of object-side surface of third lens L3;
r6 radius of curvature of the image-side surface of the third lens L3;
r7 radius of curvature of object-side surface of fourth lens L4;
r8 radius of curvature of image side surface of the fourth lens L4;
r9 radius of curvature of object-side surface of fifth lens L5;
r10 radius of curvature of the image-side surface of the fifth lens L5;
r11 radius of curvature of object side of glass plate GF;
r12 radius of curvature of image side of glass plate GF;
d: the on-axis thickness of each lens or the on-axis distance between two adjacent lenses;
d0 on-axis distance from 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: the on-axis distance from the image-side surface of the fifth lens L5 to the object-side surface of the glass plate GF;
d 11: on-axis thickness of glass flat GF;
d 12: the axial distance from the image side surface of the glass flat GF to the image surface Si;
nd: a refractive index;
nd 1: the refractive index of the first lens L1;
nd 2: the refractive index of the second lens L2;
nd 3: refractive index of the third lens L3;
nd 4: refractive index of the fourth lens L4;
nd 5: the refractive index of the fifth lens L5;
ndg: refractive index of glass plate GF;
vd is 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;
vg: abbe number of glass sheet 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 ]
In table 2, k is a conic coefficient, and a4, a6, A8, a10, a12, a14, a16, a18, a20 are aspherical 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 embodiment of the present invention. P1R1 and P2R2 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, and P4R1 and P4R2 represent the object-side surface and the image-side surface of the fourth lens L4, respectively. P5R1 and P5R2 represent the object-side surface and the image-side surface of the fifth lens L5, respectively. The "inflection point position" field correspondence data is a vertical distance from an inflection point set on each lens surface to the optical axis of the image pickup optical lens 10. The "stagnation point position" field corresponding data is the vertical distance from the stagnation point set on each lens surface to the optical axis of the imaging optical lens 10.
[ TABLE 3 ]
| Number of points of inflection | Position of reverse curvature 1 | Position of reverse curvature 2 | Position of reverse curvature 3 | |
| P1R1 | 1 | 0.905 | ||
| P1R2 | 2 | 0.325 | 0.735 | |
| P2R1 | 2 | 0.385 | 0.625 | |
| |
0 | |||
| P3R1 | 1 | 0.045 | ||
| P3R2 | 1 | 0.255 | ||
| P4R1 | 2 | 0.865 | 1.535 | |
| P4R2 | 3 | 0.965 | 1.735 | 2.085 |
| P5R1 | 1 | 1.345 | ||
| P5R2 | 3 | 0.445 | 2.295 | 2.545 |
[ TABLE 4 ]
Table 13 below also lists values corresponding to various parameters in the first embodiment and the parameters specified in the conditional expressions.
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 passing through the imaging optical lens 10, respectively. 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. The field curvature S in fig. 4 is a field curvature in the sagittal direction, and T is a field curvature in the meridional direction.
In the present embodiment, the imaging optical lens 10 has an entrance pupil diameter of 1.697mm, a full field image height of 3.264mm, a diagonal field angle of 78.80 °, a large aperture, a wide angle, and a thin profile, and has excellent optical characteristics.
(second embodiment)
Fig. 5 is a schematic structural diagram of the image pickup optical lens 20 in the second embodiment, which is basically the same as the first embodiment, and the meanings of symbols in the following list are also the same as those in the first embodiment, so that the description of the same parts is omitted here, and only different points are listed 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 inflected point and stagnation point design data of each lens in the imaging optical lens 20.
[ TABLE 7 ]
[ TABLE 8 ]
| Number of stagnation points | Location of stagnation 1 | |
| |
0 | |
| P1R2 | 1 | 0.415 |
| P2R1 | 1 | 0.585 |
| |
0 | |
| |
0 | |
| P3R2 | 1 | 0.415 |
| |
0 | |
| |
0 | |
| |
0 | |
| P5R2 | 1 | 1.085 |
Table 13 below also lists values corresponding to various parameters in embodiment two and parameters specified in the conditional expressions.
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 470nm passing through the imaging optical lens 20, respectively. 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. The field curvature S in fig. 8 is a field curvature in the sagittal direction, and T is a field curvature in the tangential direction.
In the present embodiment, the imaging optical lens 20 has an entrance pupil diameter of 1.733mm, a full field image height of 3.264mm, a diagonal field angle of 77.88 °, a large aperture, a wide angle, and a thin profile, and has excellent optical characteristics.
(third embodiment)
Fig. 9 is a schematic structural diagram of an imaging optical lens 30 in the third embodiment, which is basically the same as the first embodiment, and the meanings of symbols in the following list are also the same as those in the first embodiment, so that the description of the same parts is omitted here, and only different points are listed 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 inflected point and stagnation point design data of each lens in the imaging optical lens 30.
[ TABLE 11 ]
| Number of points of inflection | Position of reverse curvature 1 | Position of reverse curvature 2 | |
| |
0 | ||
| P1R2 | 1 | 0.215 | |
| P2R1 | 1 | 0.245 | |
| |
0 | ||
| P3R1 | 1 | 0.055 | |
| P3R2 | 1 | 0.265 | |
| P4R1 | 1 | 0.965 | |
| P4R2 | 1 | 0.945 | |
| P5R1 | 2 | 1.335 | 1.835 |
| P5R2 | 1 | 0.455 |
[ TABLE 12 ]
Table 13 below also lists values corresponding to various parameters in the third embodiment and the parameters specified in the conditional expressions.
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, respectively. 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. The field curvature S in fig. 12 is a field curvature in the sagittal direction, and T is a field curvature in the tangential direction.
In the present embodiment, the imaging optical lens 30 has an entrance pupil diameter of 1.645mm, a full field image height of 3.264mm, a diagonal field angle of 80.00 °, a large aperture, a wide angle, and a thin profile, and has excellent optical characteristics.
Table 13 below lists values of the conditional expressions in the first embodiment, the second embodiment, and the third embodiment, and values of other relevant parameters, based on the conditional expressions.
[ TABLE 13 ]
While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.
Claims (9)
1. An imaging optical lens, comprising five lenses, in order from an object side to an image side: a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power, and a fifth lens element with negative refractive power;
wherein a focal length of the entire imaging optical lens is f, a curvature radius of an object-side surface of the third lens element is R5, a curvature radius of an image-side surface of the third lens element is R6, a curvature radius of an object-side surface of the fourth lens element is R7, a curvature radius of an image-side surface of the fourth lens element is R8, an on-axis thickness of the first lens element is d1, and an on-axis distance from the image-side surface of the first lens element to the object-side surface of the second lens element is d2, and the following relationships are satisfied:
25.00≤d1/d2≤45.00；
30.00≤R5/R6≤42.00；
10.00≤R7/R8≤30.00；
0.25≤d1/f≤0.33。
2. the imaging optical lens according to claim 1, wherein 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, and the following relational expression is satisfied:
1.30≤R3/R4≤2.00。
3. the image-capturing optical lens unit according to claim 1, wherein the first lens element has a focal length f1, 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, and the image-capturing optical lens unit has a total optical length TTL satisfying the following relationships:
0.42≤f1/f≤1.43；
-3.39≤(R1+R2)/(R1-R2)≤-1.00；
0.11≤d1/TTL≤0.38。
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:
-10.30≤f2/f≤-2.00；
1.50≤(R3+R4)/(R3-R4)≤8.09；
0.02≤d3/TTL≤0.07。
5. the image-capturing optical lens of claim 1, wherein the focal length of the third lens is f3, the on-axis thickness of the third lens is d5, the total optical length of the image-capturing optical lens is TTL, and the following relationship is satisfied:
-8.56≤f3/f≤-2.63；
0.52≤(R5+R6)/(R5-R6)≤1.60；
0.03≤d5/TTL≤0.11。
6. the image-capturing optical lens unit according to claim 1, wherein the focal length of the fourth lens element is f4, the on-axis thickness of the fourth lens element is d7, the total optical length of the image-capturing optical lens unit is TTL, and the following relationship is satisfied:
0.27≤f4/f≤0.85；
0.54≤(R7+R8)/(R7-R8)≤1.83；
0.09≤d7/TTL≤0.30。
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:
-0.95≤f5/f≤-0.31；
0.23≤(R9+R10)/(R9-R10)≤0.72；
0.04≤d9/TTL≤0.12。
8. a camera optical lens according to claim 1, characterized in that the F-number of the aperture of the camera optical lens is less than or equal to 2.28.
9. The imaging optical lens according to claim 1, wherein a field angle of the imaging optical lens is FOV, and satisfies the following relation:
FOV≥77°。
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| CN111538139B (en) * | 2020-07-13 | 2020-10-16 | 瑞声通讯科技(常州)有限公司 | Image pickup optical lens |
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