CN113985587B - Optical imaging lens and imaging apparatus - Google Patents
Optical imaging lens and imaging apparatus Download PDFInfo
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- CN113985587B CN113985587B CN202111615835.4A CN202111615835A CN113985587B CN 113985587 B CN113985587 B CN 113985587B CN 202111615835 A CN202111615835 A CN 202111615835A CN 113985587 B CN113985587 B CN 113985587B
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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
Abstract
The invention discloses an optical imaging lens and imaging equipment, the optical imaging lens comprises the following components in sequence from an object side to an imaging surface along an optical axis: the first lens with positive focal power, its object side is a convex surface, the image side is a concave surface; a second lens having a negative optical power, both the object-side surface and the image-side surface of which are concave; the image side surface of the third lens is a convex surface; a fourth lens having a focal power, an object-side surface of which is convex; a fifth lens with focal power, wherein the image side surface of the fifth lens is convex; the sixth lens element with negative focal power has a concave object-side surface and a convex image-side surface. The optical imaging lens has the advantages of long focal length, small visual angle and low distortion, can provide high-definition imaging effect, and can improve the imaging quality and identification accuracy of far-distance vehicle targets.
Description
Technical Field
The present invention relates to the field of imaging lens technology, and in particular, to an optical imaging lens and an imaging device.
Background
With the development of automatic driving technology, ADAS (Advanced Driver assistance System) has become the standard of many automobiles; the vehicle-mounted camera lens is used as a key device of the ADAS, can sense the road conditions around the vehicle in real time, realizes the functions of forward collision early warning, lane deviation warning, pedestrian detection and the like, and directly influences the safety coefficient of the ADAS due to the performance of the vehicle-mounted camera lens, so that the performance requirement on the vehicle-mounted camera lens is higher and higher.
The camera lens that is applied to vehicle the place ahead that carries in ADAS mainly is discernment car place ahead situation, requires can clearly distinguish the barrier outside hectometer, realizes the collision early warning. At present, vehicle-mounted lenses used for identifying targets in front of a vehicle are usually designed for close-range targets, the field angle of the lenses is relatively large, although the lenses can better image the close-range targets, the imaging effect on the far-range targets is poor, the identification accuracy rate of the middle-range and long-range targets cannot be considered, the effective target identification range is reduced, and the requirement of the vehicle on the front pre-aiming distance during running at a high speed is difficult to meet.
Disclosure of Invention
Therefore, the invention aims to provide an optical imaging lens and an imaging device, which have the advantages of long focal length, small visual angle and low distortion, can provide high-definition imaging effect, are applied to a vehicle-mounted monitoring system, and can improve the imaging quality and the identification accuracy of a vehicle target at a longer distance.
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, comprising, in order from an object side to an imaging plane along an optical axis: the lens comprises a first lens with positive focal power, a second lens and a third lens, wherein 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; a second lens having a negative optical power, the second lens having concave object and image side surfaces; the image side surface of the third lens is a convex surface; a fourth lens having a focal power, an object side surface of the fourth lens being convex; the image side surface of the fifth lens is a convex surface; the sixth lens is provided with negative focal power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface; and a diaphragm is arranged between the second lens and the fourth lens.
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 device provided by the invention adopt six lenses with specific shapes and focal powers, so that the lens has the advantages of high pixel, long focal length and small distortion, and can effectively correct the aberration of the marginal field of view, thereby improving the resolution capability of the lens margin.
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 according to a first embodiment of the present invention;
FIG. 2 is a diagram illustrating F-tan θ distortion of an optical imaging lens according to a first embodiment of the present invention;
FIG. 3 is a field curvature graph of an optical imaging lens according to a first embodiment of the present invention;
FIG. 4 is a vertical axis chromatic aberration diagram of the optical imaging lens according to the first embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an optical imaging lens according to a second embodiment of the present invention;
FIG. 6 is a graph showing F-tan θ distortion of an optical imaging lens according to a second embodiment of the present invention;
FIG. 7 is a field curvature graph of an optical imaging lens according to a second embodiment of the present invention;
FIG. 8 is a vertical axis chromatic aberration diagram of an optical imaging lens according to a second embodiment of the present invention;
FIG. 9 is a diagram illustrating a structure of an optical imaging lens according to a third embodiment of the present invention;
FIG. 10 is a graph showing F-tan θ distortion of an optical imaging lens according to a third embodiment of the present invention;
fig. 11 is a field curvature graph of an optical imaging lens according to a third embodiment of the present invention;
FIG. 12 is a vertical axis chromatic aberration diagram of an optical imaging lens according to 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 F-tan θ distortion of an optical imaging lens according to a fourth embodiment of the present invention;
fig. 15 is a field curvature graph of an optical imaging lens according to a fourth embodiment of the present invention;
FIG. 16 is a vertical axis chromatic aberration diagram of an optical imaging lens according to a fourth embodiment of the present invention;
fig. 17 is a schematic configuration diagram of an image forming apparatus according to 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 shown 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. Like reference numerals refer to like elements throughout the specification.
The invention provides an optical imaging lens, which sequentially comprises from an object side to an imaging surface along an optical axis: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and an optical filter.
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 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 the image side surface of the third lens is a convex surface;
the fourth lens has focal power, and the object side surface of the fourth lens is a convex surface;
the fifth lens has focal power, the image side surface of the fifth lens is a convex surface, the fourth lens and the fifth lens form a bonding body, and the fifth lens can be made of crown glass materials;
the sixth lens has negative focal power, the object side surface of the sixth lens is a concave surface, the image side surface of the sixth lens is a convex surface, and the sixth lens can be made of flint glass material.
The diaphragm may be located between the second lens and the third lens, or between the third lens and the fourth lens.
In order to enable the lens to have better thermal stability, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all glass lenses; of course, other combinations of lens materials are possible to achieve the described effect.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
1.5<TTL/f<2.5；（1）
TTL/D<3.5；（2）
wherein, TTL represents the optical total length of the optical imaging lens, f represents the focal length of the optical imaging lens, and D represents the effective aperture of the optical imaging lens.
Satisfying above-mentioned conditional expressions (1) and (2), can making the camera lens have longer focal length under the condition of restraint camera lens's effective aperture, better realize with specific high pixel imaging chip cooperation, make the camera lens have good resolution.
In some embodiments, the fourth lens and the fifth lens form a bonded body, and the optical imaging lens satisfies the following conditional expression:
1.0<fL1/f<2.0；(3)
-1<fL2/f<-0.3；(4)
0.5<fL3/f<2.5；(5)
0.1<|fL4/f|<3；(6)
0.1<|fL5/f|<4；(7)
0.5<fL45/f<1；(8)
-1<fL6/f<-0.5；(9)
wherein f represents the focal length of the optical imaging lens, fL1Denotes the focal length of the first lens, fL2Denotes the focal length of the second lens, fL3Denotes the focal length of the third lens, fL4Denotes the focal length of the fourth lens, fL5Denotes the focal length of the fifth lens, fL45Representing the focal length of the adherend, fL6Indicating the focal length of the sixth lens.
The conditional expressions (3) to (9) are satisfied, the combination of the surface types of the six lenses can be basically limited, the effect of the lens for long focus is realized, and meanwhile, the aberration of the lens can be effectively reduced, so that the lens has higher resolving power.
In some embodiments, in order to reasonably limit the ability of the first and second lenses to collect light, the optical imaging lens satisfies the following conditional expression:
2<f1/fL1+f3/fL2<3；（10）
|R3/f3+R2/f2|<0.1；（11）
where f1 denotes a focal length of the object side surface of the first lens, f2 denotes a focal length of the image side surface of the first lens, f3 denotes a focal length of the object side surface of the second lens, fL1Denotes the focal length of the first lens, fL2Denotes a focal length of the second lens, R2 denotes a radius of curvature of an image-side surface of the first lens, and R3 denotes a radius of curvature of an object-side surface of the second lens.
The condition (10) is satisfied, the incident angle of the incident light can be effectively reduced, and the volume of the rear end of the lens is reduced; the first lens has positive focal power, and the second lens has negative focal power, so that the distortion of the whole optical system can be greatly reduced; and the sum of the curvature radius and the focal length ratio of the image side surface of the first lens and the object side surface of the second lens can be controlled to be as small as possible and close to zero when the conditional expression (11) is satisfied, so that the subsequent correction of the system aberration is facilitated.
In some embodiments, in order to effectively control the distortion of the lens, the optical imaging lens satisfies the following conditional expression:
θ/IH2<0.02rad/mm2；（12）
where θ represents a half field angle (unit: radian) of the optical imaging lens, and IH represents an image height corresponding to the optical imaging lens at the half field angle.
Satisfying above-mentioned conditional expression (12), can making imaging system possess the negative distortion and control within 3%, show that the camera lens can have bigger image height in marginal visual field, through the imaging of camera lens system, can make marginal visual field have better resolution.
In some embodiments, the fourth lens and the fifth lens constitute an adherend, and the fourth lens and the fifth lens satisfy the following conditional expression:
0.2<|R8/fL45|<1；（13）
|Vd4-Vd5|<35；（14）
wherein R8 represents a radius of curvature of a bonding surface of the bonded body, fL45Denotes a focal length of the adherend, Vd4 denotes an abbe number of the fourth lens, and Vd5 denotes an abbe number of the fifth lens.
The chromatic aberration of the lens can be effectively corrected by satisfying the conditional expressions (13) and (14), and the curvature radius of the adhesive surface of the adhesive body consisting of the fourth lens and the fifth lens is controlled, so that the chromatic aberration of magnification of the marginal field of view can be effectively reduced.
In some embodiments, the sixth lens satisfies the following conditional expression:
0.1<R10/R11<0.5；（15）
1<ET6/CT6<2.5；（16）
where ET6 denotes an edge thickness of the sixth lens, CT6 denotes a center thickness of the sixth lens, R10 denotes a radius of curvature of an object-side surface of the sixth lens, and R11 denotes a radius of curvature of an image-side surface of the sixth lens.
Satisfying above-mentioned conditional expressions (15) and (16), can setting up the sixth lens for the meniscus lens of bending to the image space, this kind of face form itself can not cause great aberration to through retraining the ratio of its marginal thickness and center thickness, not only can make the sixth lens easily process, also can reduce the chief ray incident angle, specific high pixel chip of better cooperation.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
1<R9/R10<4；（17）
1.0<SD9/SD10<1.4；（18）
where R9 denotes a radius of curvature of an image-side surface of the fifth lens, R10 denotes a radius of curvature of an object-side surface of the sixth lens, SD9 denotes an effective aperture of the image-side surface of the fifth lens, and SD10 denotes an effective aperture of the object-side surface of the sixth lens.
The curved surface type of the image side surface of the fifth lens element can be consistent with that of the object side surface of the sixth lens element when the conditional expressions (17) and (18) are satisfied, so that the sixth lens element can better correct aberrations such as spherical aberration, curvature of field and the like generated by the front lens element, and the lens has better imaging effect.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
f/θ>60mm/rad；（19）
wherein f represents the focal length of the optical imaging lens, and theta represents the half field angle (unit: radian) of the optical imaging lens.
The condition (19) is satisfied, and the optical imaging lens has the characteristics of long focal length and small visual angle, and can realize long-distance high-definition imaging.
And the fourth lens and the fifth lens form an adhesion body for better correcting chromatic aberration of the system.
In some embodiments, the fourth lens is a double convex lens having a positive power, and the fifth lens is a meniscus lens having a negative power.
In other embodiments, the fourth lens is a meniscus lens having a negative power, and the fifth lens is a double convex lens having a positive power. The combination can realize the correction of the system chromatic aberration and can effectively improve the resolving power.
Compared with an aspheric lens, although the spherical lens has poor capability of correcting aberration such as spherical aberration, the spherical lens has the advantage of lower cost than the aspheric lens under the condition of meeting the imaging requirements of modules and chips, and the optical imaging lens adopts the all-glass spherical lens, so that the system has better thermal stability and can meet the stable imaging capability in high and low temperature environments; on the other hand, the lens can have high-definition imaging quality.
The optical imaging lens has the advantages that the configuration is satisfied, the optical imaging lens has the advantages of being high in pixel, long in focal length and small in distortion, meanwhile, the spherical lenses are adopted, manufacturing cost can be greatly reduced, and the lens is composed of all-glass lenses, so that the optical imaging lens has good thermal stability, and still has good imaging capability under the condition of low temperature and high temperature.
The invention is further illustrated below in the following examples. In each embodiment, the thickness, the curvature radius, and the material selection part of each lens in the optical imaging lens are different, and the specific difference can be referred to the parameter table of each embodiment. The following examples are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following examples, and any other changes, substitutions, combinations or simplifications which do not depart from the innovative points of the present invention should be construed as being equivalent substitutions and shall be included within the scope of the present invention.
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: the lens comprises a first lens L1, a second lens L2, an aperture stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a filter G1.
The first lens element L1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2.
The second lens L2 has a negative power, and both the object-side surface S3 and the image-side surface S4 of the second lens are concave.
The third lens L3 has positive power, and the object-side surface S5 of the third lens is concave and the image-side surface S6 is convex.
The fourth lens L4 has positive optical power, and both the object-side surface S7 and the image-side surface of the fourth lens are convex.
The fifth lens L5 has negative power, the object-side surface of the fifth lens is concave, the image-side surface S9 is convex, the fifth lens L4 and the sixth lens L5 are cemented into a cemented body, and the image-side surface of the fourth lens and the object-side surface of the fifth lens are cemented into a cemented surface S8.
The sixth lens element L6 has negative power, and has a concave object-side surface S10 and a convex image-side surface S11.
The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all glass spherical lenses.
The parameters of the optical imaging lens 100 provided in the first embodiment of the present invention are shown in table 1.
TABLE 1
In the present embodiment, graphs of F-tan θ distortion, field curvature, and vertical axis chromatic aberration of the optical imaging lens 100 are shown in fig. 2, 3, and 4, respectively.
Referring to fig. 2, it is shown a F-tan θ distortion diagram of the optical imaging lens 100 according to the first embodiment of the present invention, and it can be seen from the diagram that the F-tan θ distortion of the lens is within ± 2% and is a negative distortion, which indicates that the distortion of the optical imaging lens 100 is well corrected.
Referring to fig. 3, a field curvature graph of the optical imaging lens 100 according to the first embodiment of the present invention is shown, and it can be seen from the graph that the maximum deviation amount of the field curvature is controlled within ± 0.04 mm, which illustrates that the optical imaging lens 100 can effectively correct the aberration of the peripheral field.
Referring to fig. 4, a vertical axis chromatic aberration curve diagram of the optical imaging lens 100 according to the first embodiment of the present invention is shown, and it can be seen from the diagram that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength are controlled within ± 1 micron, which indicates that the vertical axis chromatic aberration of the optical imaging lens 100 and the secondary spectrum of the whole image plane are well corrected.
Second embodiment
Referring to fig. 5, a schematic structural diagram of an optical imaging lens 200 according to a second embodiment of the invention is shown. The optical imaging lens 200 in this embodiment is substantially the same as the optical imaging lens 100 in the first embodiment, except that the bonded body of the optical imaging lens 200 in this embodiment is turned, that is, the fourth lens L4 has negative optical power, the object-side surface S7 is a convex surface, the image-side surface is a concave surface, the fifth lens L5 has positive optical power, both the object-side surface S9 and the image-side surface S9 are convex surfaces, and the curvature radius and material selection of each lens are different.
The parameters related to each lens of the optical imaging lens 200 provided in the present embodiment are shown in table 2.
TABLE 2
Referring to fig. 6, it shows a F-tan θ distortion diagram of an optical imaging lens 200 according to a second embodiment of the present invention, and it can be seen from the diagram that the F-tan θ distortion of the lens is within ± 3.1%, and is a negative distortion, which indicates that the distortion of the optical imaging lens 200 is well corrected.
Referring to fig. 7, a field curvature graph of the optical imaging lens 200 according to the second embodiment of the present invention is shown, and it can be seen from the graph that the maximum deviation amount of the field curvature is controlled within ± 0.04 mm, which illustrates that the optical imaging lens 200 can effectively correct the aberration of the peripheral field of view.
Referring to fig. 8, it can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength of the optical imaging lens 200 according to the second embodiment of the present invention is controlled within ± 1 micron, which indicates that the vertical axis chromatic aberration of the optical imaging lens 200 and the secondary spectrum of the entire image plane are well corrected.
Third embodiment
Referring to fig. 9, a structure diagram of an optical imaging lens 300 according to the present embodiment is shown. The optical imaging lens 300 in the present embodiment is substantially the same as the optical imaging lens 200 in the second embodiment, except that the object-side surface S5 of the third lens L3 of the optical imaging lens 300 in the present embodiment is a convex surface, and the curvature radius and material selection of each lens are different.
The parameters of the optical imaging lens 300 provided in the present embodiment are shown in table 3.
TABLE 3
Referring to fig. 10, it shows a F-tan θ distortion diagram of an optical imaging lens 300 according to a third embodiment of the present invention, and it can be seen from the diagram that the F-tan θ distortion of the lens is within ± 3% and is a negative distortion, which indicates that the distortion of the optical imaging lens 300 is well corrected.
Referring to fig. 11, a field curvature graph of the optical imaging lens 300 according to the third embodiment of the present invention is shown, and it can be seen from the graph that the maximum deviation amount of the field curvature is controlled within ± 0.04 mm, which illustrates that the optical imaging lens 300 can effectively correct the aberration of the peripheral field of view.
Referring to fig. 12, it can be seen that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength of the optical imaging lens 300 according to the third embodiment of the present invention is controlled within ± 1 μm, which indicates that the vertical axis chromatic aberration of the optical imaging lens 300 and the secondary spectrum of the entire image plane are well corrected.
Fourth embodiment
Fig. 13 is a structural diagram of an optical imaging lens 400 according to the present embodiment. The optical imaging lens 400 in the present embodiment is largely the same as the optical imaging lens 100 in the first embodiment, except that the stop ST of the optical imaging lens 400 in the present embodiment is located between the third lens L3 and the fourth lens L4, and the radii of curvature of the respective lenses are different.
The parameters related to the respective lenses of the optical imaging lens 400 provided in the present embodiment are shown in table 4.
TABLE 4
Referring to fig. 14, it is shown a F-tan θ distortion diagram of an optical imaging lens 400 according to a fourth embodiment of the invention, and it can be seen from the diagram that the F-tan θ distortion of the lens is within ± 2% and is a negative distortion, which indicates that the distortion of the optical imaging lens 400 is well corrected.
Referring to fig. 15, a field curvature graph of an optical imaging lens 400 according to a fourth embodiment of the invention is shown, from which it can be seen that the maximum deviation of the field curvature is controlled within ± 0.04 mm, which indicates that the optical imaging lens 400 can effectively correct the aberration of the peripheral field of view.
Referring to fig. 16, it can be seen that the vertical axis chromatic aberration of the optical imaging lens 400 according to the fourth embodiment of the present invention is controlled within ± 0.5 μm, which indicates that the vertical axis chromatic aberration of the optical imaging lens 400 and the secondary spectrum of the entire image plane are well corrected.
Please refer to table 5, which shows the optical characteristics corresponding to the optical imaging lens provided in the above four embodiments, including the focal length F, the total optical length TTL, the field angle FOV, the image height IH and the F # corresponding to the optical imaging lens at half field angle, and the related values corresponding to each of the above conditional expressions.
TABLE 5
In summary, the first lens and the second lens are used for collecting light rays, so that the incident angle of the incident light rays is reduced, the lens volume is reduced, and the subsequent correction of the imaging system on aberration is facilitated; the second lens is a biconcave spherical lens and is mainly used for correcting the distortion and spherical aberration of the first lens; the third lens is a positive lens with the two-side vector height being close, so that the aberration caused by the lens can be effectively reduced; the fourth lens and the fifth lens are matched to eliminate field curvature, wherein the fifth lens is made of crown glass materials, the sixth lens is made of flint glass materials, correction of vertical axis chromatic aberration and secondary spectrum is facilitated, an imaging system can have a good imaging effect in a visible light range, and the fourth lens and the fifth lens form a bonding body with positive focal power, so that converged light rays are smoothly incident, tolerance is reduced, and production yield is improved; the sixth lens is a meniscus spherical lens and is mainly used for correcting spherical aberration and field curvature and increasing optical back focus. Each lens is a glass lens, so that the lens has better thermal stability and mechanical strength, and is beneficial to working in an extreme environment.
Fifth embodiment
Referring to fig. 17, an imaging apparatus 500 according to a fifth embodiment of the present invention is shown, 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.
This imaging device 500 can be the electronic equipment who has loaded above-mentioned optical imaging lens of on-vehicle supervisory equipment, security protection equipment, AR/VR equipment, unmanned aerial vehicle and any other form.
The imaging device 500 provided by the embodiment includes the optical imaging lens 100, and since the optical imaging lens 100 has the advantages of high pixel, long focal length and small distortion, and can effectively correct the aberration of the marginal field of view, the imaging device 500 having the optical imaging lens 100 also has the advantages of high pixel, long focal length and small distortion, and can effectively correct the aberration of the marginal field of view.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 more specific and detailed, but not construed 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 should be subject to the appended claims.
Claims (11)
1. An optical imaging lens, comprising, in order from an object side to an imaging surface along an optical axis:
the lens comprises a first lens with positive focal power, a second lens and a third lens, wherein 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;
a second lens having a negative optical power, the second lens having concave object and image side surfaces;
the image side surface of the third lens is a convex surface;
a fourth lens having a focal power, an object side surface of the fourth lens being convex;
the fifth lens is provided with focal power, the image side surface of the fifth lens is a convex surface, and the fourth lens and the fifth lens form an adhesive body;
the sixth lens is provided with negative focal power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface;
a diaphragm is arranged between the second lens and the fourth lens;
the optical imaging lens meets the following conditional expression:
1.820≤R9/R10<4；
1.0<SD9/SD10<1.4；
wherein R9 denotes a radius of curvature of an image-side surface of the fifth lens, R10 denotes a radius of curvature of an object-side surface of the sixth lens, SD9 denotes an effective aperture of the image-side surface of the fifth lens, and SD10 denotes an effective aperture of the object-side surface of the sixth lens.
2. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
1.5<TTL/f<2.5；
TTL/D<3.5；
wherein, TTL represents the optical total length of the optical imaging lens, f represents the focal length of the optical imaging lens, and D represents the effective aperture of the optical imaging lens.
3. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
1.0<fL1/f<2.0；
-1<fL2/f<-0.3；
0.5<fL3/f<2.5；
0.1<|fL4/f|<3；
0.1<|fL5/f|<4；
0.5<fL45/f<1；
-1<fL6/f<-0.5；
wherein f represents the focal length of the optical imaging lens, fL1Denotes the focal length of the first lens, fL2Denotes the focal length of the second lens, fL3Denotes the focal length of the third lens, fL4Denotes the focal length of the fourth lens, fL5Denotes a focal length of the fifth lens, fL45Representing the focal length of the adherend, fL6Denotes a focal length of the sixth lens.
4. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
2<f1/fL1+f3/fL2<3；
|R3/f3+R2/f2|<0.1；
wherein, f1Denotes the focal length of the object side of the first lens, f2A focal length representing an image side surface of the first lens, f3Denotes the focal length of the object side of the second lens, fL1Denotes the focal length of the first lens, fL2Denotes the focal length, R, of the second lens2Represents a radius of curvature, R, of an image-side surface of the first lens3Represents a radius of curvature of an object-side surface of the second lens.
5. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
θ/IH2<0.02rad/mm2；
wherein θ represents a half field angle of the optical imaging lens, and IH represents an image height corresponding to the optical imaging lens at the half field angle θ.
6. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditional expression:
0.2<|R8/fL45|<1；
|Vd4-Vd5|<35；
wherein R8 represents a radius of curvature of a bonding surface of the bonded body, fL45Denotes a focal length of the adherend, Vd4 denotes an abbe number of the fourth lens, and Vd5 denotes an abbe number of the fifth lens.
7. The optical imaging lens according to claim 1, characterized in that the sixth lens satisfies the following conditional expression:
0.1<R10/R11<0.5；
1<ET6/CT6<2.5；
wherein ET6 denotes an edge thickness of the sixth lens, CT6 denotes a center thickness of the sixth lens, R10 denotes a radius of curvature of an object-side surface of the sixth lens, and R11 denotes a radius of curvature of an image-side surface of the sixth lens.
8. The optical imaging lens according to claim 1, characterized in that the optical imaging lens satisfies the following conditional expression:
f/θ>60mm/rad；
wherein f represents the focal length of the optical imaging lens, and theta represents the half field angle of the optical imaging lens.
9. The optical imaging lens according to claim 1, wherein the fourth lens is a double convex lens having a positive power, and the fifth lens is a meniscus lens having a negative power.
10. The optical imaging lens of claim 1, wherein the fourth lens is a meniscus lens having a negative power, and the fifth lens is a double convex lens having a positive power.
11. An imaging apparatus comprising the optical imaging lens according to any one of claims 1 to 10 and an imaging element for converting an optical image formed by the optical imaging lens into an electric signal.
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| JPH02120714A (en) * | 1988-10-31 | 1990-05-08 | Canon Inc | Zoom lens of small size |
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