CN112485888B - Optical imaging lens and imaging apparatus - Google Patents
Optical imaging lens and imaging apparatus Download PDFInfo
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- CN112485888B CN112485888B CN202011337922.3A CN202011337922A CN112485888B CN 112485888 B CN112485888 B CN 112485888B CN 202011337922 A CN202011337922 A CN 202011337922A CN 112485888 B CN112485888 B CN 112485888B
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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
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
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Abstract
The invention discloses an optical imaging lens and imaging equipment, wherein the optical imaging lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side along an optical axis; the first lens has positive focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has negative focal power, the object side surface of the second lens is concave at a paraxial position, and the image side surface of the second lens is concave at the paraxial position; the third lens has positive focal power, the object side surface of the third lens is convex at the paraxial position, and the image side surface of the third lens is convex at the paraxial position; the fourth lens has positive focal power, the object side surface of the fourth lens is convex at the paraxial position, and the image side surface of the fourth lens is convex at the paraxial position; the fifth lens element has a negative power, and has an object-side surface that is concave at the paraxial region and an image-side surface that is concave at the paraxial region. The optical imaging lens can clearly image in a high-low temperature range of minus 40 ℃ to plus 105 ℃, and has the characteristics of small distortion, easy processing of lenses, low sensitivity, high imaging quality and clearer imaging of distant objects.
Description
Technical Field
The present invention relates to the field of imaging lens technologies, and in particular, to an optical imaging lens and an imaging device.
Background
With the development of unmanned driving technology, ADAS (Advanced Driver assistance system) has become a standard for automobiles, and vehicle-mounted cameras have a great importance in ADAS application, and all-around information inside and outside a vehicle can be acquired through front-view, rear-view, 360-degree look-around and other cameras. For a front-view lens applied to the front of a vehicle, the front-view lens mainly identifies the front condition of the vehicle, particularly information at a distance of 100-200 meters in front of the vehicle, so that the lens is required to have higher imaging definition so as to identify a distant object, a road mark and the like; meanwhile, the lens is required to have good thermal stability, and the requirement of having good resolving power in outdoor high-low temperature environments is met.
In order to acquire long-distance road information, the imaging of a lens is generally required to be clear within a small visual angle range, which is different from the current intelligent automobile data recorder in the market, and the larger the visual angle of the lens is, the better the camera of the intelligent automobile data recorder needs to be, in order to be wide; however, such lenses are not far from the eye, have poor target recognition performance for a long distance, cannot correctly recognize and alarm for a vehicle with a long distance, and most lenses in the existing market cannot well meet the requirements, so that it is urgent to develop a high-performance optical imaging lens capable of matching with ADAS.
Disclosure of Invention
Therefore, the present invention is directed to an optical imaging lens and an imaging apparatus, which solve the above problems.
The embodiment of the invention implements the above object by the following technical scheme.
In a first aspect, the present invention provides an optical imaging lens, which includes, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, a diaphragm, a third lens element, a fourth lens element and a fifth lens element. The first lens has positive focal power, and the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has negative focal power, and the object side surface and the image side surface of the second lens are both concave surfaces; the third lens has positive focal power, and both the object-side surface and the image-side surface of the third lens are convex surfaces; the fourth lens has positive focal power, and both the object side surface and the image side surface of the fourth lens are convex surfaces; the fifth lens has negative focal power, and both the object side surface and the image side surface of the fifth lens are concave; the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all glass spherical lenses, and the optical centers of the lenses are all located on the same straight line.
In a second aspect, the present invention provides an imaging apparatus, including an imaging element and the optical imaging lens provided in the first aspect, wherein the imaging element is configured to convert an optical image formed by the optical imaging lens into an electrical signal.
Compared with the prior art, the optical imaging lens and the imaging equipment provided by the invention have the advantages that through reasonable configuration of the surface types of the lenses and reasonable collocation of the focal power, the lens meets the long-focus characteristic, has the characteristic of more clear imaging on a distant object, simultaneously has the beneficial effects of good thermal stability, low sensitivity, convenience in assembly and the like, and can well meet the requirements of ADAS on the lens; in addition, the optical imaging lens of the invention totally uses the glass lens, not only make the lens overcome the lens and cause the defect that the focus drifts easily under the environment with great temperature difference, but also can guarantee the dependability quality of the lens to a great extent, make it suitable for the field that is harsher to the environment.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of an optical imaging lens in a first embodiment of the present invention;
fig. 2 is a graph showing an optical distortion of an optical imaging lens in a first embodiment of the present invention;
FIG. 3 is a MTF chart at-40 ℃ of the optical imaging lens according to the first embodiment of the present invention;
FIG. 4 is a MTF chart of the optical imaging lens at 105 ℃ in the first embodiment of the present invention;
FIG. 5 is a diagram illustrating an optical imaging lens assembly according to a second embodiment of the present invention;
FIG. 6 is a graph showing optical distortion of an optical imaging lens according to a second embodiment of the present invention;
FIG. 7 is a MTF graph of an optical imaging lens at-40 ℃ in a second embodiment of the present invention;
FIG. 8 is a MTF graph of an optical imaging lens at 105 ℃ in a second embodiment of the present invention;
FIG. 9 is a schematic structural diagram of an optical imaging lens system according to a third embodiment of the present invention;
fig. 10 is a graph showing an optical distortion of an optical imaging lens in a third embodiment of the present invention;
FIG. 11 is a MTF chart at-40 ℃ of an optical imaging lens according to a third embodiment of the present invention;
fig. 12 is an MTF chart at 105 ℃ of an optical imaging lens in a third embodiment of the present invention;
FIG. 13 is a schematic structural diagram of an optical imaging lens system according to a fourth embodiment of the present invention;
fig. 14 is a graph showing an optical distortion of an optical imaging lens in a fourth embodiment of the present invention;
FIG. 15 is a MTF chart at-40 ℃ of an optical imaging lens according to a fourth embodiment of the present invention;
fig. 16 is an MTF graph of an optical imaging lens at 105 ℃ in a fourth embodiment of the present invention;
fig. 17 is a schematic structural view of an image forming apparatus provided in a fifth embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
With the advocation of the automobile unmanned driving concept in recent years and the continuous maturity of unmanned driving technology, unmanned driving becomes a trend of automobile development in the future. Vehicle-mounted camera lenses are also rapidly developed as part of automobile components, and the requirements for the lenses are also higher and higher. In some cases, in addition to the requirement for better optical properties, good stability is also required.
Based on this, the invention provides an optical imaging lens, which has the advantages of high imaging quality, small optical distortion, good thermal stability and the like. The optical imaging lens sequentially comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens and a fifth lens from an object side to an image side along an optical axis. The first lens has positive focal power, and the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has negative focal power, and the object side surface and the image side surface of the second lens are both concave surfaces; the third lens has positive focal power, and both the object side surface and the image side surface of the third lens are convex surfaces; the fourth lens has positive focal power, and both the object side surface and the image side surface of the fourth lens are convex surfaces; the fifth lens has negative focal power, and both the object side surface and the image side surface of the fifth lens are concave; the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all glass spherical lenses, and the optical centers of the lenses are all located on the same straight line.
In some embodiments, the optical imaging lens satisfies the conditional expression:
7＜f/F#＜8； (1)
where F denotes a focal length of the optical imaging lens, and F # denotes an aperture value of the optical imaging lens. Satisfying above-mentioned conditional expression (1), can guaranteeing that the system has great effective focal length, satisfies the long focal characteristic, has the characteristics that the formation of image is more clear to the object of long shot.
In some embodiments, the optical imaging lens satisfies the conditional expression:
0.1＜f2/f+f4/f＜0.4； (2)
where f2 denotes a focal length of the second lens, f4 denotes a focal length of the fourth lens, and f denotes a focal length of the optical imaging lens. Satisfy above-mentioned conditional expression (2), through the rational distribution to the focal power of second lens and fourth lens, can effectively control the spherical aberration and the coma of system to promote the camera lens resolving power.
In some embodiments, the optical imaging lens satisfies the conditional expression:
45＜Vd1＜55； (3)
65＜Vd3＜91； (4)
vd1 represents the abbe number of the first lens, and Vd3 represents the abbe number of the third lens. The conditional expressions (3) and (4) are met, and the chromatic aberration of the lens can be reduced by reasonably selecting the materials used for the first lens and the third lens.
In some embodiments, the optical imaging lens satisfies the conditional expression:
1＜(SD11+SD52)/(2*Imgh)＜1.2； (5)
0.85＜SD52/Imgh＜0.95； (6)
where SD11 denotes the maximum effective radius of the object-side surface of the first lens element, SD52 denotes the maximum effective radius of the image-side surface of the fifth lens element, and Imgh denotes the actual half image height of the optical imaging lens. The requirements of the conditional expressions (5) and (6) can ensure that the difference between the calibers of the head end and the tail end of the lens and the image surface is small, and the assembly of the lens is facilitated.
In some embodiments, the optical imaging lens satisfies the conditional expression:
-7.5×10-6/℃＜(dN/dT)3＜-6.5×10-6/℃； (7)
0.5＜f3/f＜0.8； (8)
wherein, (dN/dT)3 represents a refractive index temperature coefficient of the third lens, f3 represents a focal length of the third lens, and f represents a focal length of the optical imaging lens. Satisfy above-mentioned conditional expression (7) and (8), make the third lens adopt the specific glass material of thermal property, can effectively compensate the influence of temperature variation to camera lens focus, promote the stability of camera lens analytic power under different temperatures.
In some embodiments, the optical imaging lens satisfies the conditional expression:
0.5＜(R12-R11)/(R12+R11)＜0.8； (9)
0.55＜ET1/CT1＜0.75； (10)
where R11 denotes a radius of curvature of an object-side surface of the first lens, R12 denotes a radius of curvature of an image-side surface of the first lens, ET1 denotes an edge thickness of the first lens, and CT1 denotes a center thickness of the first lens. Satisfying above-mentioned conditional expression, can making the light distribution through first lens more even, being favorable to rationally distributing the light deflection angle of optical imaging lens front end, improving the optical characteristic of system.
In some embodiments, the optical imaging lens satisfies the conditional expression:
0.2＜R51/R32＜0.6； (11)
-12mm＜R51＜-5mm； (12)
where R51 denotes a radius of curvature of the object-side surface of the fifth lens, and R32 denotes a radius of curvature of the image-side surface of the third lens. The condition formulas (11) and (12) are met, so that the ghost image formed by reflecting light rays between the object side surface of the fifth lens and the image side surface of the third lens can be effectively eliminated, the ghost image is prevented from appearing in a shot image, and the imaging quality of the shot image by the lens is effectively improved.
In some embodiments, the optical imaging lens satisfies the conditional expression:
1<(f*tanθ)/IH<1.01； (13)
where f denotes a focal length of the optical imaging lens, θ denotes a half field angle of the optical imaging lens, and Imgh denotes an actual half image height of the optical imaging lens. The conditional expression (13) reflects the ratio of the ideal image height to the actual image height, the conditional expression (13) is satisfied, the lens can have very small optical distortion, the image acquired by the lens can be directly matched with an imaging chip to output a clear image without distortion algorithm correction, the difficulty in algorithm realization is reduced, and the imaging requirement of high imaging quality can be satisfied.
In some embodiments, the optical imaging lens satisfies the conditional expression:
0.35＜Nd4-Nd3＜0.55； (14)
35＜Vd3-Vd4＜65； (15)
0.6＜f3/f4＜1.2； (16)
where Nd3 denotes a refractive index of the third lens, Nd4 denotes a refractive index of the fourth lens, Vd3 denotes an abbe number of the third lens, Vd4 denotes an abbe number of the fourth lens, f3 denotes a focal length of the third lens, and f4 denotes a focal length of the fourth lens. The optical chromatic aberration of the system can be effectively corrected by reasonably distributing and balancing the focal power and dispersion relation of the third lens and the fourth lens according to the conditional expressions (14) to (16), the imaging quality is improved, the deflection angle of light rays in the lenses can be effectively reduced, the production sensitivity of the lenses is reduced, and the yield of products is improved.
In some embodiments, at least one of the fourth lens and the fifth lens is made of flint glass, and the flint glass satisfies the following conditional expression: vd < 55, Nd <1.6028 or Vd < 50, and Nd > 1.6, wherein Vd represents the Abbe number of the flint glass, and Nd represents the refractive index of the flint glass. The condition formula is satisfied, the chromatic aberration of the system can be effectively improved, and the imaging quality can be improved.
The invention is further illustrated below in the following examples. In each of the following embodiments, the thickness and the radius of curvature of each lens in the optical imaging lens are different, and specific differences can be referred to in the parameter tables in the embodiments.
First embodiment
Referring to fig. 1, a schematic structural diagram of an optical imaging lens 100 according to a first embodiment of the present invention is shown, where the optical imaging lens 100 sequentially includes, from an object side to an image plane along an optical axis: a first lens L1, a second lens L2, a stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a filter G1, a cover glass G2, and an image forming surface S15.
The first lens element L1 has positive refractive power, and the object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex and concave;
the second lens L2 has negative power, and both the object-side surface S3 and the image-side surface S4 of the second lens L2 are concave;
the third lens L3 has positive power, and both the object-side surface S5 and the image-side surface S6 of the third lens L3 are convex;
the fourth lens L4 has positive power, and both the object-side surface S7 and the image-side surface S8 of the fourth lens L4 are convex;
the fifth lens L5 has a negative power, and the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are both concave.
The first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are all glass spherical lenses, and the optical centers of the lenses are all located on the same straight line.
The stop ST is disposed between the second lens L2 and the third lens L3.
The filter G1 is disposed between the fifth lens L5 and the protective glass G2, and the filter G1 can be used to selectively filter part of the light, so as to optimize the imaging result. The imaging surface S15 may be a plane where light incident from the object side is imaged on the image side by the optical imaging lens.
The curvature radius, thickness, material, and other relevant parameters of each lens of the optical imaging lens 100 in the present embodiment are shown in table 1.
TABLE 1
Referring to fig. 2, it is shown an optical distortion curve diagram of the optical imaging lens 100 in this embodiment, and it can be seen from fig. 2 that the absolute value of the optical distortion is less than 0.6% in the whole field of view, which shows that the distortion is well corrected, and when the optical distortion is matched with a specific chip, the image formed by the optical imaging lens 100 does not have distortion phenomenon under the condition of not performing digital distortion correction.
Referring to fig. 3 and 4, MTF graphs of the optical imaging lens 100 at-40 ℃ and 105 ℃ are shown, respectively, and it can be seen that, under the conditions of low temperature of-40 ℃ and high temperature of 105 ℃, MTF values of the optical imaging lens 100 at a spatial frequency of 83p/mm at a middle frequency in a full field of view are both greater than 0.7, which indicates that the optical imaging lens 100 has good thermal stability and higher resolution.
Second embodiment
Referring to fig. 5, a schematic structural diagram of an optical imaging lens 200 according to a second embodiment of the present invention is shown, where the optical imaging lens 200 in the present embodiment has a structure substantially the same as that of the optical imaging lens 100 in the first embodiment, and the difference is that curvature radii and material selections of the lenses are different.
The curvature radius, thickness, material and other relevant parameters of each lens of the optical imaging lens 200 in the embodiment of the present invention are shown in table 2.
TABLE 2
Referring to fig. 6, a graph of the optical distortion of the optical imaging lens 200 in this embodiment is shown, and it can be seen from fig. 6 that the absolute value of the optical distortion is less than 0.3% in the whole field of view, which indicates that the distortion is well corrected.
Referring to fig. 7 and 8, MTF graphs of the optical imaging lens 200 at-40 ℃ and 105 ℃ are shown, respectively, and it can be seen from the graphs that, under the conditions of low temperature of-40 ℃ and high temperature of 105 ℃, the MTF value of the optical imaging lens 200 at the intermediate frequency of 83p/mm in the full field of view is greater than 0.6, which indicates that the optical imaging lens 200 has good thermal stability and higher resolution.
Third embodiment
Referring to fig. 9, a schematic structural diagram of an optical imaging lens 300 according to a third embodiment of the present invention is shown, where the optical imaging lens 300 in the present embodiment has a structure substantially the same as that of the optical imaging lens 100 in the first embodiment, and the difference is that curvature radii and material selections of the lenses are different.
Relevant parameters of curvature radius, thickness, material, and the like of each lens of the optical imaging lens 300 in the embodiment of the present invention are shown in table 3.
TABLE 3
Referring to fig. 10, a graph of the optical distortion of the optical imaging lens 300 of the present embodiment is shown, and it can be seen from fig. 10 that the absolute value of the optical distortion is less than 0.05% in the whole field of view, which indicates that the distortion is well corrected.
Referring to fig. 11 and 12, MTF graphs of the optical imaging lens 300 at-40 ℃ and 105 ℃ are shown, respectively, and it can be seen that, under the conditions of low temperature of-40 ℃ and high temperature of 105 ℃, MTF values of the optical imaging lens 300 at a spatial frequency of 83p/mm at a middle frequency in a full field of view are greater than 0.6, which indicates that the optical imaging lens 300 has good thermal stability and higher resolution.
Fourth embodiment
Referring to fig. 13, a schematic structural diagram of an optical imaging lens 400 according to a fourth embodiment of the present invention is shown, where the optical imaging lens 400 in the present embodiment has a structure substantially the same as that of the optical imaging lens 100 in the first embodiment, and the difference is that curvature radii and material selections of the lenses are different.
Relevant parameters of curvature radius, thickness, material and the like of each lens of the optical imaging lens 400 in the embodiment of the present invention are shown in table 4.
TABLE 4
Referring to fig. 14, a graph of the optical distortion of the optical imaging lens 400 of the present embodiment is shown, and it can be seen from fig. 13 that the absolute value of the optical distortion is less than 0.05% in the whole field of view, which indicates that the distortion is well corrected.
Referring to fig. 15 and 16, MTF graphs of the optical imaging lens 400 at-40 ℃ and 105 ℃ are shown, respectively, and it can be seen that under the conditions of low temperature of-40 ℃ and high temperature of 105 ℃, MTF values of the optical imaging lens 400 at a spatial frequency of 83p/mm at a middle frequency in a full field of view are both greater than 0.6, which indicates that the optical imaging lens 400 has good thermal stability and higher resolution.
Table 5 shows the above 4 embodiments and their corresponding optical characteristics, including the focal length F, the maximum field angle 2 θ, the aperture value F # and the total optical length TTL of the system, and the values corresponding to each of the foregoing conditional expressions.
TABLE 5
| Relation formula | Example 1 | Example 2 | Example 3 | Example 4 |
| f(mm) | 17.813 | 17.814 | 17.728 | 17.729 |
| TTL(mm) | 25 | 25 | 25 | 24.35 |
| F# | 2.395 | 2.4 | 2.4 | 2.395 |
| 2θ(deg) | 22.0 | 22.0 | 22.0 | 22.0 |
| Imgh(mm) | 3.444 | 3.448 | 3.440 | 3.442 |
| f/F# | 7.438 | 7.423 | 7.387 | 7.403 |
| f2/f+f4/f | 0.310 | 0.169 | 0.179 | 0.139 |
| Vd1 | 47.5 | 54.7 | 54.7 | 54.7 |
| Vd3 | 90.3 | 90.3 | 68.3 | 68.3 |
| (SD11+SD52)/(2*Imgh) | 1.183 | 1.073 | 1.053 | 1.086 |
| SD52/Imgh | 0.911 | 0.896 | 0.899 | 0.883 |
| (dN/dT)3 | -6.9×10-6/℃ | -6.9×10-6/℃ | -7.4×10-6/℃ | -7.4×10-6/℃ |
| f3/f | 0.607 | 0.767 | 0.779 | 0.612 |
| (R12-R11)/(R12+R11) | 0.589 | 0.744 | 0.742 | 0.663 |
| ET1/CT1 | 0.589 | 0.649 | 0.737 | 0.690 |
| R51/R32 | 0.398 | 0.537 | 0.546 | 0.210 |
| R51(mm) | -5.627 | -9.842 | -8.628 | -6.658 |
| (f*tanθ)/Imgh | 1.005 | 1.004 | 1.002 | 1.001 |
| Nd4-Nd3 | 0.44 | 0.54 | 0.41 | 0.41 |
| Vd3-Vd4 | 53.2 | 62 | 40 | 40 |
| f3/f4 | 0.733 | 1.161 | 0.635 | 0.847 |
In summary, the optical imaging lens provided by the invention has the following advantages:
(1) the optical imaging lens adopts five glass lenses, and the lens meets the long-focus characteristic through reasonable configuration of the surface types of the lenses and reasonable collocation of focal power, has the characteristic of clearer imaging of a distant object, and also has the beneficial effects of good thermal stability, low sensitivity, convenience in assembly and the like. The lens is totally made of glass lenses, so that the reliability and quality of the lens can be guaranteed to a great extent, and the lens can be suitable for fields which are harsh to the environment, such as the requirement of ADAS on the lens can be well met.
(2) The third lens and the fourth lens are both biconvex lenses, and two biconvex lenses are continuously adopted, so that the light deflection angle in the system is more gentle, and the tolerance sensitivity of the lens is favorably reduced.
(3) The third lens adopts a glass spherical lens with specific thermal performance, and the positive and negative refractive indexes of each lens are optimized, so that the aberration of the lens is effectively corrected, and the defect that the lens is easy to cause focus drift in an environment with large temperature difference is overcome.
(4) Through the reasonable setting to the lens face type, make each lens shape pleasing to the eye and conventional, the processing production of being convenient for is favorable to the camera lens equipment simultaneously, and the yield of assurance product that can be fine accords with the volume production standard.
Fifth embodiment
Referring to fig. 17, a fifth embodiment of the present invention provides an imaging apparatus 500, where the imaging apparatus 500 may include an imaging element 510 and an optical imaging lens (e.g., the optical imaging lens 100) in any of the embodiments described above. The imaging element 510 may be a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and may also be a CCD (Charge Coupled Device) image sensor.
The imaging device 500 may be an onboard monitor, a drone, a panoramic camera, a mobile terminal, or any other electronic device loaded with the optical imaging lens 100.
The imaging device 500 provided by the embodiment includes the optical imaging lens in any of the above embodiments, and since the optical imaging lens 100 has the characteristics of good thermal stability, small distortion, high imaging quality, and clearer imaging of a distant object, the imaging device 500 having the optical imaging lens 100 also has the advantages of small distortion, high imaging quality, clearer imaging of a distant object, and the like.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An optical imaging lens, characterized by five lenses having optical powers, comprising, in order from an object side to an imaging surface along an optical axis: the lens comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens and a fifth lens;
the first lens has positive focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has negative focal power, and both the object side surface and the image side surface of the second lens are concave surfaces;
the third lens has positive focal power, and both the object-side surface and the image-side surface of the third lens are convex surfaces;
the fourth lens has positive focal power, and both the object-side surface and the image-side surface of the fourth lens are convex surfaces;
the fifth lens has negative focal power, and both the object-side surface and the image-side surface of the fifth lens are concave surfaces;
the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all glass spherical lenses, and the optical centers of the lenses are all positioned on the same straight line;
the optical imaging lens meets the following conditional expression:
0.35＜Nd4-Nd3＜0.55；
40≤Vd3-Vd4＜65；
0.6＜f3/f4＜1.2；
wherein Nd3 denotes a refractive index of the third lens, Nd4 denotes a refractive index of the fourth lens, Vd3 denotes an abbe number of the third lens, Vd4 denotes an abbe number of the fourth lens, f3 denotes a focal length of the third lens, and f4 denotes a focal length of the fourth lens.
2. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
7mm＜f/F#＜8mm；
wherein F represents the focal length of the optical imaging lens, and F # represents the aperture value of the optical imaging lens.
3. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
0.1＜f2/f+f4/f＜0.4；
wherein f2 denotes a focal length of the second lens, f4 denotes a focal length of the fourth lens, and f denotes a focal length of the optical imaging lens.
4. The optical imaging lens according to claim 1, characterized in that the optical imaging lens satisfies the following conditional expression:
1＜(SD11+SD52)/(2*Imgh)＜1.2；
0.85＜SD52/Imgh＜0.95；
wherein SD11 denotes a maximum effective radius of an object-side surface of the first lens, SD52 denotes a maximum effective radius of an image-side surface of the fifth lens, and Imgh denotes an actual half image height of the optical imaging lens.
5. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
-7.5×10-6/℃＜(dN/dT)3＜-6.5×10-6/℃；
0.5＜f3/f＜0.8；
wherein (dN/dT)3 represents a temperature coefficient of refractive index of the third lens, f3 represents a focal length of the third lens, and f represents a focal length of the optical imaging lens.
6. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
0.5＜(R12-R11)/(R12+R11)＜0.8；
0.55＜ET1/CT1＜0.75；
wherein R11 represents a radius of curvature of an object-side surface of the first lens, R12 represents a radius of curvature of an image-side surface of the first lens, ET1 represents an edge thickness of the first lens, and CT1 represents a center thickness of the first lens.
7. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
0.2＜R51/R32＜0.6；
-12mm＜R51＜-5mm；
wherein R51 denotes a radius of curvature of an object-side surface of the fifth lens, and R32 denotes a radius of curvature of an image-side surface of the third lens.
8. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
1<(f*tanθ)/Imgh<1.01；
wherein f represents a focal length of the optical imaging lens, θ represents a half field angle of the optical imaging lens, and Imgh represents an actual half image height of the optical imaging lens.
9. The optical imaging lens according to claim 1, wherein at least one of the fourth lens and the fifth lens is made of flint glass, and the flint glass satisfies the conditional expression: vd < 55, Nd <1.6028 or Vd < 50, Nd > 1.6, Vd representing the Abbe number of the flint glass, and Nd representing the refractive index of the flint glass.
10. An imaging apparatus comprising the optical imaging lens according to any one of claims 1 to 9 and an imaging element for converting an optical image formed by the optical imaging lens into an electric signal.
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