CN112882209B - Wide-angle lens and imaging apparatus - Google Patents
Wide-angle lens and imaging apparatus Download PDFInfo
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- CN112882209B CN112882209B CN202110462819.XA CN202110462819A CN112882209B CN 112882209 B CN112882209 B CN 112882209B CN 202110462819 A CN202110462819 A CN 202110462819A CN 112882209 B CN112882209 B CN 112882209B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
Abstract
The invention discloses a wide-angle lens and imaging equipment, the wide-angle lens comprises the following components in sequence from an object side to an imaging surface along an optical axis: the first lens with negative focal power has a convex object-side surface and a concave image-side surface; a second lens having a focal power, wherein the object-side surface of the second lens is a concave surface, and the image-side surface of the second lens is a convex surface; the image side surface of the third lens is a convex surface; a diaphragm; a fourth lens with positive focal power, wherein the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; a fifth lens with positive focal power, wherein the object side surface of the fifth lens is a convex surface or a plane, and the image side surface of the fifth lens is a convex surface; a sixth lens element having a negative refractive power, the object-side surface of which is concave; a seventh lens element with positive refractive power having a convex object-side surface and a concave image-side surface; wherein the fifth lens and the sixth lens form a bonding body; the wide-angle lens includes at least one aspherical lens. The wide-angle lens has the advantages of large aperture, high pixel and good thermal stability.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to a wide-angle lens and imaging equipment.
Background
At present, with the development of the automatic driving technology and the aggravation of the market demand, many countries have issued policies related to promoting the development of automatic driving in succession, the development of industries related to automatic driving is greatly promoted, and the vehicle-mounted camera lens serving as a key component of an automatic driving auxiliary system is rapidly developed.
Because the application environment of the automobile is complicated and changeable and the requirement on safety performance is high, the optical lens carried in the automatic driving auxiliary system is required to be higher, and particularly, the optical lens applied to the front of the automobile has a wider visual angle, high-quality image output under different illumination conditions in the day and at night is ensured, and meanwhile, the optical lens also has strong environmental adaptability and can keep good resolving power under high and low temperature environments. However, most lenses in the existing market have difficulty in meeting the above requirements.
Disclosure of Invention
Therefore, an object of the present invention is to provide a wide-angle lens and an imaging apparatus having a large aperture, a high pixel, and good thermal stability.
The embodiment of the invention implements the above object by the following technical scheme.
In a first aspect, the present invention provides a wide-angle lens, comprising, in order from an object side to an image plane along an optical axis: the lens comprises a first lens with negative 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; the second lens is provided with focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; the image side surface of the third lens is a convex surface; a diaphragm; the fourth lens is provided with positive focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; the lens comprises a fifth lens with positive focal power, wherein the object side surface of the fifth lens is a convex surface or a plane, and the image side surface of the fifth lens is a convex surface; a sixth lens having a negative optical power, an object side surface of the sixth lens being a concave surface; the lens comprises a seventh lens with positive focal power, wherein the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a concave surface; wherein the fifth lens and the sixth lens constitute an adherend; the wide-angle lens comprises at least one aspheric lens.
In a second aspect, the present invention provides an imaging apparatus including an imaging element for converting an optical image formed by the wide-angle lens into an electric signal, and the wide-angle lens provided in the first aspect.
The first lens and the second lens are aspheric lenses, so that the curvature of field and distortion of the lens can be effectively corrected; the third lens and the fourth lens are both lenses with positive focal power, and the third lens and the fourth lens are distributed on two sides of the diaphragm, so that the focal power can be effectively shared, and the tolerance sensitivity of the two lenses is reduced; meanwhile, the image side surface of the third lens and the object side surface of the fourth lens are respectively arranged in a convex surface and a concave surface which are opposite, so that ghost images generated by reflection on the two surfaces can be effectively eliminated; the fourth lens and the fifth lens are made of materials with negative temperature refractive index coefficients, so that the back focal offset caused by temperature change can be effectively compensated; the positive lens and the negative lens form a bonding body, and the abbe number difference of the positive lens and the negative lens is more than 40, so that chromatic aberration can be effectively corrected; the seventh lens is a meniscus lens, so that the wide-angle lens has a larger chief ray incident angle, the back focus of the lens is effectively shortened, the total length of the whole optical system is further reduced, and the volume of the lens is reduced; meanwhile, the seventh lens is an aspheric lens, so that the effect of eliminating aberration can be better achieved, the resolving power of the imaging system is effectively improved, and the imaging system meets higher pixel requirements. 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.
Compared with the prior art, the wide-angle lens provided by the invention adopts seven lenses with specific shapes and focal powers, so that the lens has a larger aperture, and high-quality image output under different illumination conditions in the day and at night can be ensured; meanwhile, the lens has the advantages of large wide angle, high pixel and good thermal stability, and can meet the imaging requirements in the complex and changeable environment of the vehicle-mounted and monitoring field.
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 a wide-angle lens in a first embodiment of the present invention;
FIG. 2 is a diagram illustrating axial chromatic aberration of a wide-angle lens according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a wide-angle lens in a second embodiment of the present invention;
FIG. 4 is a diagram showing axial chromatic aberration of a wide-angle lens in a second embodiment of the present invention;
fig. 5 is a schematic structural diagram of a wide-angle lens in a third embodiment of the present invention;
FIG. 6 is a diagram showing axial chromatic aberration of a wide-angle lens in a third embodiment of the present invention;
fig. 7 is a schematic structural diagram of a wide-angle lens in a fourth embodiment of the present invention;
FIG. 8 is a diagram showing axial chromatic aberration of a wide-angle lens in a fourth embodiment of the present invention;
FIG. 9 is a defocus curve of the central field of view of the wide-angle lens at 20 deg.C;
FIG. 10 is the defocus curve of the central field of view of the wide-angle lens at a low temperature of-40 ℃ in the first embodiment of the present invention;
FIG. 11 is the defocus curve of the central field of view of the wide-angle lens at 105 ℃ in the first embodiment of the present invention;
fig. 12 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. Like reference numerals refer to like elements throughout the specification.
The invention provides a wide-angle lens, which sequentially comprises the following components 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 diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an optical filter.
The first lens has negative focal power, and the object side surface and the image side surface of the first lens are convex and concave;
the second lens has focal power, and the object side surface of the second lens is a concave surface and the image side surface of the second lens is a convex surface;
the third lens has positive focal power, and the image side surface of the third lens is a convex surface;
the fourth lens has positive focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface;
the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface or a plane, and the image side surface of the fifth lens is a convex surface;
the sixth lens has negative focal power, the object side surface of the sixth lens is a concave surface, and the fifth lens and the sixth lens form a bonding body;
the seventh lens has positive focal power, and the object side surface and the image side surface of the seventh lens are convex and concave.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
0.3＜r12/r13＜1；（1）
3＜f7/f＜20；（2）
wherein r is12Denotes a radius of curvature, r, of an object side surface of the seventh lens13Denotes a radius of curvature of an image-side surface of the seventh lens element, f7Denotes a focal length of the seventh lens, and f denotes a focal length of the wide-angle lens.
Satisfying above-mentioned conditional expressions (1) and (2), through the meniscus shape and the focus of reasonable setting seventh lens, can make optical system has great chief ray incident angle to reduce optical system's optics back focus, and then reduce whole optical system's total length.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
-10mm/°＜r7/θ7-r8/θ8＜-1mm/°；（3）
5mm＜f4/Nd4＜15mm；（4）
wherein r is7Denotes the radius of curvature of the object-side surface of the fourth lens, r8Denotes a radius of curvature, theta, of an image-side surface of the fourth lens7Denotes the marginal ray angle of incidence, θ, of the object side of the fourth lens8Representing the marginal ray angle of incidence, f, of the image-side surface of the fourth lens4Denotes the focal length, Nd, of the fourth lens4Representing the refractive index of the material of the fourth lens.
Generally, the edge light incidence angle of the light at the object side and the image side of the first lens behind the stop is large, which results in the sensitivity of the lens to tolerance increase, and further results in low yield rate of lens assembly. Satisfying the above conditional expressions (3) and (4), the marginal light incident angle of the fourth lens can be effectively reduced, the tolerance sensitivity of the fourth lens is reduced, and the assembly yield of the wide-angle lens is improved.
In some embodiments, the wide-angle lens satisfies the following condition:
1＜r7/r6＜6；（5）
8＜f3/CT34＜13；（6）
wherein r is6Denotes the radius of curvature of the image-side surface of the third lens, r7Denotes the radius of curvature of the object-side surface of the fourth lens, f3Denotes the focal length of the third lens, CT34The vertical distance from the center vertex of the image-side surface of the third lens to the center vertex of the object-side surface of the fourth lens is shown.
The optical system meets the conditional expressions (5) and (6), and the curvature radius ratio and the air interval of the adjacent surfaces between the third lens and the fourth lens are controlled, so that the image side surface of the third lens and the object side surface of the fourth lens are arranged in a manner that the convex surface and the concave surface are opposite, the influence of ghost images formed by the reflection of light rays between the image side surface of the third lens and the object side surface of the fourth lens on a shot picture can be effectively eliminated, and the imaging quality of the optical system is effectively improved.
In some embodiments, the wide-angle lens satisfies the following condition:
-20×10-6/℃＜(dn/dt)4+(dn/dt)5＜-9×10-6/℃；（7）
0.1＜r8/f4-r10/f5＜0.6；（8）
wherein, (dn/dt)4Temperature refractive index of the fourth lens, (dn/dt)5Denotes a temperature refractive index coefficient, r, of the fifth lens8Denotes the radius of curvature of the image-side surface of the fourth lens, r10Denotes a radius of curvature of an image-side surface of the fifth lens element, f4Denotes the focal length of the fourth lens, f5Indicating the focal length of the fifth lens.
Satisfy above-mentioned conditional expression (7) and (8), through the glass material of reasonable selection fourth lens and fifth lens to the shape of control lens can compensate the influence that the change of temperature brought optical system's back burnt effectively, effectively promotes wide-angle lens adaptability under different temperature environment, improves the stability of camera formation of image.
In some embodiments, the wide-angle lens satisfies the following condition:
1.2＜DL1/DST＜1.7；（9）
-60＜f3/CT3ST＜-10；（10）
wherein D isL1Denotes the effective aperture of the first lens, DSTRepresenting the effective aperture of the diaphragm, f3Denotes the focal length of the third lens, CT3STThe vertical distance from the central vertex of the image side surface of the third lens to the diaphragm is shown.
Satisfying the above conditional expressions (9) and (10), the f-number of the wide-angle lens can be ensured not to be larger than 1.5, so that the lens has the characteristic of large aperture (i.e. large aperture), the luminous flux of the lens can be effectively increased, and the lens can output high-quality images in the environment with light and shade change.
In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all glass lenses. 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.
In some embodiments, in order to improve the resolution of the lens and effectively reduce the vertical axis chromatic aberration of the lens, the wide-angle lens adopts a plurality of aspheric lenses, and the use of the aspheric lenses can better correct the aberration of the lens, improve the resolution of the lens and enable the image to be clearer. Specifically, the first lens, the second lens and the seventh lens are all glass aspheric lenses, and the third lens, the fourth lens, the fifth lens and the sixth lens are all glass spherical lenses.
Satisfying the above configuration is advantageous for ensuring that the wide-angle lens has a large aperture, a short overall length, a high pixel, and good high and low temperature compensation performance.
The invention is further illustrated below in the following examples. In various embodiments, the thickness, the curvature radius, and the material selection of each lens in the wide-angle lens are different, and the specific differences can be referred to in the parameter tables of the various embodiments. 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.
The aspheric surface shape of the wide-angle lens in the embodiments of the present invention satisfies the following equation:
wherein z represents the distance in the optical axis direction from the curved surface vertex, c represents the curvature of the curved surface vertex, K represents the conic coefficient, h represents the distance from the optical axis to the curved surface, and B, C, D, E and F represent the fourth, sixth, eighth, tenth and twelfth order curved surface coefficients, respectively.
First embodiment
Referring to fig. 1, a schematic structural diagram of a wide-angle lens 100 according to a first embodiment of the present invention is shown, where the wide-angle 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, a third lens L3, a diaphragm ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and a filter G1.
The first lens element L1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2.
The second lens L2 has negative power, and the object-side surface S3 of the second lens is concave and the image-side surface S4 is convex.
The third lens L3 has positive optical 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 power, and the fourth lens has a concave object-side surface S7 and a convex image-side surface S8.
The fifth lens L5 has positive optical power, and both the object-side surface S9 and the image-side surface of the fifth lens are convex.
The sixth lens L6 has negative power, the object-side surface and the image-side surface S11 of the sixth lens are both concave, the fifth lens L5 and the sixth lens L6 constitute an adhesive body, and the image-side surface of the fifth lens and the object-side surface of the sixth lens are adhered to form an adhesive surface S10.
The seventh lens L7 has positive power, and the object-side surface S12 of the seventh lens is convex and the image-side surface S13 is concave.
The first lens L1, the second lens L2, and the seventh lens L7 are all glass aspheric lenses, and the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all glass spherical lenses.
The relevant parameters of each lens of the wide-angle lens 100 in the first embodiment of the present invention are shown in table 1.
TABLE 1
In the present embodiment, the relevant parameters of the aspherical lens of the wide-angle lens 100 are shown in table 2.
TABLE 2
As shown in fig. 2, which is a graph of axial chromatic aberration of the wide-angle lens 100 in this embodiment, as can be seen from fig. 2, the maximum single wavelength of the axial chromatic aberration of the wide-angle lens 100 is not more than 0.03mm, and the difference between two different wavelengths is not more than 0.015mm, which indicates that the axial chromatic aberration of the wide-angle lens 100 at the pupil edge position is well corrected.
Second embodiment
Referring to fig. 3, a structure diagram of a wide-angle lens 200 according to a second embodiment is shown. The wide-angle lens 200 in the present embodiment is substantially the same as the wide-angle lens 100 in the first embodiment, except that the second lens L2 of the wide-angle lens 200 in the present embodiment has positive optical power, the object-side surface S5 of the third lens L3 is a plane (the plane can be regarded as a spherical surface with an infinite radius of curvature), and the radius of curvature, the inter-lens distance, and the material selection of each lens are different; the object side surface S5 of the third lens is set to be a plane, so that the tolerance of the system is better, the plane is easy to process, the yield is high, and the production is convenient.
The parameters associated with the respective lenses of wide-angle lens 200 provided in the present embodiment are shown in table 3.
TABLE 3
Table 4 shows relevant parameters of the aspherical lens of wide-angle lens 200 of the present embodiment.
TABLE 4
As shown in fig. 4, which is a graph of axial chromatic aberration of wide-angle lens 200 in this embodiment, it can be seen from fig. 4 that the maximum single wavelength of axial chromatic aberration of wide-angle lens 200 is not more than 0.03mm, and the difference between two different wavelengths is not more than 0.02mm, which indicates that the axial chromatic aberration of wide-angle lens 200 at the pupil edge position is well corrected.
Third embodiment
Referring to fig. 5, a structure diagram of a wide-angle lens 300 according to a third embodiment is shown. The wide-angle lens 300 in this embodiment is substantially the same as the wide-angle lens 100 in the first embodiment, except that the second lens L2 of the wide-angle lens 300 in this embodiment has positive refractive power, the object-side surface S5 of the third lens L3 is a convex surface, the object-side surface S9 of the fifth lens L5 is a plane, the image-side surface S11 of the sixth lens L6 is a plane, and the radii of curvature, the inter-lens distances, and the material choices of the respective lenses are different. The plane is arranged, so that the processing cost of the lens is greatly reduced, the tolerance of the system is effectively improved, and the processability is better.
The parameters associated with the respective lenses of wide-angle lens 300 provided in the present embodiment are shown in table 5.
TABLE 5
Table 6 shows relevant parameters of the aspherical lens of wide-angle lens 300 of the present embodiment.
TABLE 6
As shown in fig. 6, which is a graph of axial chromatic aberration of wide-angle lens 300 in the present embodiment, it can be seen from fig. 6 that the maximum single wavelength of the axial chromatic aberration of wide-angle lens 300 is not more than 0.03mm, and the difference between two different wavelengths is not more than 0.025mm, which indicates that the axial chromatic aberration of wide-angle lens 300 at the pupil edge position is well corrected.
Fourth embodiment
Referring to fig. 7, a structure diagram of a wide-angle lens 400 according to a fourth embodiment is shown. The wide-angle lens 400 in this embodiment is substantially the same as the wide-angle lens 100 in the first embodiment, except that the second lens L2 of the wide-angle lens 400 in this embodiment has positive optical power, the object-side surface S5 of the third lens L3 is a convex surface, the image-side surface S11 of the sixth lens L6 is a convex surface, and the curvature radius, the inter-lens distance, and the material selection of the lenses are different.
The present embodiment provides wide-angle lens 400 having the relevant parameters of the respective lenses as shown in table 7.
TABLE 7
Table 8 shows relevant parameters of the aspherical lens of wide-angle lens 400 of the present embodiment.
TABLE 8
As shown in fig. 8, which is a graph of axial chromatic aberration of wide-angle lens 400 in this embodiment, it can be seen from fig. 8 that the maximum single wavelength of the axial chromatic aberration of wide-angle lens 400 is not more than 0.03mm, and the difference between two different wavelengths is not more than 0.03mm, which indicates that the axial chromatic aberration of wide-angle lens 400 at the pupil edge position is well corrected.
Further, the wide-angle lens provided by the embodiment of the invention can effectively correct the problems of optical back focus offset and image force reduction caused by temperature change. Taking the wide-angle lens 100 provided in the first embodiment as an example, as shown in fig. 9, 10 and 11, the defocus curves of the central field of view of the wide-angle lens 100 provided in the first embodiment of the present invention at normal temperature of 20 ℃, low temperature of-40 ℃ and high temperature of 105 ℃ can be seen from the following figures: on the basis of normal temperature of 20 ℃, the defocusing of the wide-angle lens 100 at a low temperature of-40 ℃ shifts by only about 1.2 μm at the central peak position, and the variation of MTF of the central peak is less than 1%; the defocus of the lens at the high temperature of 105 ℃ is shifted only about 1.5 μm at the center peak position, and the variation of the MTF at the center peak is less than 2%. The wide-angle lens provided by the embodiment of the invention has small defocusing offset and MTF variable quantity under high and low temperature conditions, so that the wide-angle lens provided by the embodiment of the invention can better correct the back focal offset brought by temperature, has small MTF variable quantity, effectively ensures the imaging quality of the lens under high and low temperature environments, and greatly improves the thermal stability of the lens.
Table 9 is optical characteristics corresponding to the above four embodiments, including the field angle 2 θ, F number F # and total optical length TTL, and numerical values corresponding to each of the foregoing conditional expressions.
TABLE 9
By integrating the above embodiments, the wide-angle lens of the present invention achieves the following optical indexes: (1) the field angle: 2 theta is more than or equal to 130 degrees; (2) total optical length: TTL <22 mm; (3) f-number: f # is less than or equal to 1.5; (3) the applicable spectral range is as follows: 400 nm-700 nm.
In the wide-angle lens provided by the invention, the first lens and the second lens are aspheric lenses, so that the field curvature and distortion of the lens can be effectively corrected; the third lens and the fourth lens are both lenses with positive focal power, and the third lens and the fourth lens are distributed on two sides of the diaphragm, so that the focal power can be effectively shared, and the tolerance sensitivity of the two lenses is reduced; meanwhile, the image side surface of the third lens and the object side surface of the fourth lens are respectively arranged in a convex surface and a concave surface which are opposite, so that ghost images generated by reflection on the two surfaces can be effectively eliminated; the fourth lens and the fifth lens are made of materials with negative temperature refractive index coefficients, so that the back focal offset caused by temperature change can be effectively compensated; the positive lens and the negative lens form a bonding body, and the abbe number difference of the positive lens and the negative lens is more than 40, so that chromatic aberration can be effectively corrected; the seventh lens is a meniscus lens, so that the wide-angle lens has a larger chief ray incident angle, the back focus of the lens is effectively shortened, the total length of the whole optical system is further reduced, and the volume of the lens is reduced; meanwhile, the seventh lens is an aspheric lens, so that the effect of eliminating aberration can be better achieved, the resolving power of the imaging system is effectively improved, and the imaging system meets higher pixel requirements. 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. 12, an imaging device 500 according to a fifth embodiment of the present invention is shown, where the imaging device 500 may include an imaging element 510 and a wide-angle lens (e.g., wide-angle 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 a vehicle-mounted imaging device, a panoramic camera, an unmanned aerial vehicle, or any other electronic device equipped with the wide-angle lens.
The imaging device 500 provided by the embodiment of the application includes the wide-angle lens 100, and since the wide-angle lens 100 has the advantages of large aperture, high pixel and good thermal stability, the imaging device 500 having the wide-angle lens 100 also has the advantages of large aperture, high pixel and good thermal stability.
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 shall be subject to the appended claims.
Claims (9)
1. A wide-angle lens, comprising, in order from an object side to an imaging surface along an optical axis:
the lens comprises a first lens with negative 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;
the second lens is provided with focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface;
the image side surface of the third lens is a convex surface;
a diaphragm;
the fourth lens is provided with positive focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface;
the lens comprises a fifth lens with positive focal power, wherein the object side surface of the fifth lens is a convex surface or a plane, and the image side surface of the fifth lens is a convex surface;
a sixth lens having a negative optical power, an object side surface of the sixth lens being a concave surface;
the lens comprises a seventh lens with positive focal power, wherein the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a concave surface;
wherein the fifth lens and the sixth lens constitute an adherend; the wide-angle lens at least comprises an aspheric lens;
the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all glass lenses;
the wide-angle lens meets the following conditional expression:
1.2＜DL1/DST＜1.7；
-60＜f3/CT3ST＜-10；
wherein D isL1Representing the effective aperture of the first lens, DSTRepresenting the effective aperture of the diaphragm, f3Denotes the focal length, CT, of the third lens3STRepresents a vertical distance from a central vertex of an image-side surface of the third lens to the stop.
2. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
0.3＜r12/r13＜1；
3＜f7/f＜20；
wherein r is12Represents a radius of curvature, r, of an object-side surface of the seventh lens13Represents a radius of curvature of an image-side surface of the seventh lens element, f7Denotes a focal length of the seventh lens, and f denotes a focal length of the wide-angle lens.
3. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
-10mm/°＜r7/θ7-r8/θ8＜-1mm/°；
5mm＜f4/Nd4＜15mm；
wherein r is7Represents a radius of curvature, r, of an object-side surface of the fourth lens8Represents a radius of curvature, theta, of an image-side surface of the fourth lens7Representing an edge ray angle of incidence, θ, of the object side of the fourth lens8Representing an angle of incidence of marginal rays of the image side of the fourth lens, f4Denotes the focal length, Nd, of the fourth lens4Representing the refractive index of the material of the fourth lens.
4. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
1＜r7/r6＜6；
8＜f3/CT34＜13；
wherein r is6Represents a radius of curvature, r, of an image-side surface of the third lens7Represents a radius of curvature of an object side surface of the fourth lens, f3Denotes the focal length, CT, of the third lens34Represents a vertical distance from a center vertex of an image-side surface of the third lens to a center vertex of an object-side surface of the fourth lens.
5. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
-20×10-6/℃＜(dn/dt)4+(dn/dt)5＜-9×10-6/℃；
0.1＜r8/f4-r10/f5＜0.6；
wherein, (dn/dt)4Represents a temperature refractive index coefficient of the fourth lens, (dn/dt)5Representing a temperature refractive index coefficient of the fifth lens，r8Represents a radius of curvature, r, of an image-side surface of the fourth lens10Represents a radius of curvature of an image-side surface of the fifth lens element, f4Denotes the focal length of the fourth lens, f5Denotes a focal length of the fifth lens.
6. The wide-angle lens of claim 1, wherein the object-side surface of the third lens is concave or planar and the image-side surface of the sixth lens is concave.
7. The wide-angle lens of claim 1, wherein the object-side surface of the third lens element is convex and the image-side surface of the sixth lens element is convex or planar.
8. The wide-angle lens of claim 1, wherein the first lens, the second lens, and the seventh lens are all glass aspheric lenses, and the third lens, the fourth lens, the fifth lens, and the sixth lens are all glass spherical lenses.
9. An imaging apparatus comprising the wide-angle lens according to any one of claims 1 to 8, and an imaging element for converting an optical image formed by the wide-angle lens into an electrical signal.
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