CN113900238B - Optical lens and imaging apparatus - Google Patents
Optical lens and imaging apparatus Download PDFInfo
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- CN113900238B CN113900238B CN202111502701.1A CN202111502701A CN113900238B CN 113900238 B CN113900238 B CN 113900238B CN 202111502701 A CN202111502701 A CN 202111502701A CN 113900238 B CN113900238 B CN 113900238B
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
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Abstract
The invention provides an optical lens and imaging equipment, belonging to the technical field of optical imaging; the optical lens comprises seven lenses in total, and sequentially comprises the following components from an object side to an imaging surface along an optical axis: a first lens having a negative optical power; a second lens having a negative optical power; a third lens having a positive optical power; a diaphragm; a fourth lens having positive optical power; a fifth lens having optical power; a sixth lens having a negative optical power; and a seventh lens having positive optical power; the sixth lens and the seventh lens are glued into a glue body, and the optical centers of the lenses are positioned on the same straight line; the optical lens satisfies the conditional expression: 2.18 < TTL/D < 2.34, wherein TTL represents the optical total length of the optical lens, D represents the maximum optical aperture of the optical lens, and the optical lens has the characteristics of small volume, high resolution and large aperture. The imaging apparatus includes an optical lens and an imaging element that converts an optical image into an electrical signal.
Description
Technical Field
The present invention relates to the field of optical imaging technologies, and in particular, to an optical lens and an imaging device.
Background
As ADAS (Advanced Driving assistance System) is increasingly applied to automobiles, the application range of the vehicle-mounted camera is wider and the use demand is larger, and the optical lens as an important component of the vehicle-mounted camera is also continuously updated and developed towards high pixel.
At present, the conventional vehicle-mounted lens is low in resolution, is difficult to match with a current 8M chip with high pixel and high resolution, and cannot meet the market demand.
Disclosure of Invention
Based on the above, the invention provides an optical lens and an imaging device, which can overcome the defects of the vehicle-mounted lens in the prior art, so as to meet the design requirement of the vehicle-mounted camera on the vehicle-mounted lens.
An embodiment of the present invention provides an optical lens, which includes seven lenses, in order from an object side to an image plane along an optical axis:
the first lens with negative focal power has a convex object-side surface and a concave image-side surface;
the second lens with negative 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 object side surface of the third lens is a concave surface or a convex surface, and the image side surface of the third lens is a convex surface;
a diaphragm;
the fourth lens with positive focal power has a convex object-side surface and a convex image-side surface;
a fifth lens element with a focal power, wherein the object-side surface of the fifth lens element is concave and the image-side surface of the fifth lens element is convex;
the object side surface of the sixth lens is a convex surface or a concave surface, and the image side surface of the sixth lens is a concave surface;
the object side surface and the image side surface of the seventh lens are convex surfaces;
the sixth lens and the seventh lens are glued into a glue body, and the optical centers of the lenses are positioned on the same straight line;
the optical lens satisfies the conditional expression: TTL/D is more than 2.18 and less than 2.34; wherein, TTL represents the optical total length of the optical lens, and D represents the maximum light-passing aperture of the optical lens.
In some embodiments, the optical lens satisfies the conditional expression: nd6/Nd7 is less than 1.16, Vd6/Vd7 is less than 0.35; wherein Vd6 represents an abbe number of the sixth lens, Vd7 represents an abbe number of the seventh lens, Nd6 represents a refractive index of the sixth lens, and Nd7 represents a refractive index of the seventh lens.
In some embodiments, the optical lens satisfies the conditional expression: theta/IH 2 < 3.354 DEG/mm; wherein θ represents a half field angle of the optical lens, and IH represents an image height of the optical lens at the half field angle θ.
In some embodiments, the optical lens satisfies the conditional expression: d1/TTL > 0.13, 1.26 < | R2/f1| + | R3/f2| < 1.49; wherein d1 represents the air space between the first and second lenses, R2 represents the radius of curvature of the image side surface of the first lens, R3 represents the radius of curvature of the object side surface of the second lens, f1 represents the effective focal length of the first lens, and f2 represents the effective focal length of the second lens.
In some embodiments, the optical lens satisfies the conditional expression: d2/TTL is less than 0.008, 3.99 < (| f2| + f3)/f is less than 5.53; wherein d2 represents an air space between the second lens and the third lens, f3 represents an effective focal length of the third lens, and f represents an effective focal length of the optical lens.
In some embodiments, the optical lens satisfies the conditional expression: ET3/ET4 is more than 2.9 and less than 10.9, and CT3/CT4 is more than 1.15 and less than 1.44; wherein ET3 represents the distance from the third lens edge to the stop, ET4 represents the distance from the stop to the fourth lens edge, CT3 represents the center thickness of the third lens, and CT4 represents the center thickness of the fourth lens.
In some embodiments, the optical lens satisfies the conditional expression: 0.82 < CT5/ET5 < 1.17, 10.06 < | f5/f | < 13.33; wherein CT5 represents a center thickness of the fifth lens, ET5 represents an edge thickness of the fifth lens, f represents an effective focal length of the optical lens, and f5 represents an effective focal length of the fifth lens.
In some embodiments, the optical lens satisfies the conditional expression: 0.7 < | f3/f4| < 1; wherein f3 represents the effective focal length of the third lens, and f4 represents the effective focal length of the fourth lens.
In some embodiments, the third lens, the fourth lens, and the fifth lens are glass aspheric lenses, and the first lens, the second lens, the sixth lens, and the seventh lens are glass spherical lenses.
Compared with the prior art, the invention has the beneficial effects that: the structure of seven lenses is adopted, and the characteristics of small volume, high resolution and large aperture of the optical lens are realized by optimally setting the shapes of the lenses, reasonably distributing the focal power of each lens, forming a cemented lens and the like. Particularly, most of the existing lenses in the current market are 1.8-2.0 apertures, and the aperture of the optical lens is 1.6, so that the light transmission amount is obviously improved, and the lens has a good imaging effect in a dark environment.
Another embodiment of the present invention provides an imaging apparatus including the optical lens described above and an imaging element for converting an optical image formed by the optical lens into an electrical signal.
Compared with the prior art, the invention has the beneficial effects that: the imaging device adopts the optical lens with high resolution, can be matched with the current 8M chip with high pixel and high resolution, and meets the requirements of the current market.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
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 lens according to a first embodiment of the present invention;
fig. 2 is a curvature of field diagram of an optical lens according to a first embodiment of the present invention;
fig. 3 is a distortion diagram of an optical lens system according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of an optical lens according to a second embodiment of the present invention;
fig. 5 is a curvature of field diagram of an optical lens according to a second embodiment of the present invention;
fig. 6 is a distortion diagram of an optical lens system according to a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of an optical lens according to a third embodiment of the present invention;
fig. 8 is a curvature of field diagram of an optical lens according to a third embodiment of the present invention;
fig. 9 is a distortion diagram of an optical lens system according to a third embodiment of the present invention;
fig. 10 is a schematic structural diagram of an optical lens according to a fourth embodiment of the present invention;
fig. 11 is a curvature of field diagram of an optical lens according to a fourth embodiment of the present invention;
fig. 12 is a distortion diagram of an optical lens system according to a fourth embodiment of the present invention;
fig. 13 is a schematic configuration diagram of an image forming apparatus provided in a fifth embodiment of the present invention.
Description of the main element symbols:
the following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. 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.
The invention provides an optical lens, which comprises seven lenses in total, and sequentially comprises the following components from an object side to an imaging surface along an optical axis:
a first lens element having a negative refractive power, the object-side surface of which is convex and the image-side surface of which is concave;
a second lens with negative 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;
a third lens with positive focal power, wherein the object side surface of the third lens is a concave surface or a convex surface, and the image side surface of the third lens is a convex surface;
a diaphragm;
the fourth lens with positive focal power has a convex object-side surface and a convex image-side surface;
a fifth lens element with a focal power, wherein the object-side surface of the fifth lens element is concave and the image-side surface of the fifth lens element is convex;
the object side surface of the sixth lens is a convex surface or a concave surface, and the image side surface of the sixth lens is a concave surface;
the object side surface and the image side surface of the seventh lens are convex surfaces;
the sixth lens and the seventh lens are glued into a glue body, and the optical centers of the lenses are positioned on the same straight line.
In some embodiments, the optical lens satisfies the conditional expression: TTL/D is more than 2.18 and less than 2.34; wherein, TTL represents the optical total length of the optical lens, and D represents the maximum light-passing aperture of the optical lens. The lens has the advantages that the size of the lens can be effectively reduced, and the miniaturization of the lens is realized.
In some embodiments, the optical lens satisfies the conditional expression: nd6/Nd7 is less than 1.16, Vd6/Vd7 is less than 0.35; wherein Vd6 represents an abbe number of the sixth lens, Vd7 represents an abbe number of the seventh lens, Nd6 represents a refractive index of the sixth lens, and Nd7 represents a refractive index of the seventh lens. The condition is met, the chromatic aberration generated after light passes through the front-end lens can be effectively eliminated by controlling the difference value of the refractive index and the Abbe number of the adhesive body formed by combining the sixth lens and the seventh lens, and the secondary spectrum is balanced.
In some embodiments, the optical lens satisfies the conditional expression: theta/IH 2 < 3.354 DEG/mm; wherein θ represents a half field angle of the optical lens, and IH represents an image height of the optical lens at the half field angle θ. The condition is satisfied, the lens has larger image height in the marginal field of view, and better imaging effect is achieved in the marginal field of view after the photo is stretched.
In some embodiments, the optical lens satisfies the conditional expression: d1/TTL > 0.13, 1.26 < | R2/f1| + | R3/f2| < 1.49; wherein d1 represents the air space between the first and second lenses, R2 represents the radius of curvature of the image side surface of the first lens, R3 represents the radius of curvature of the object side surface of the second lens, f1 represents the effective focal length of the first lens, and f2 represents the effective focal length of the second lens. The second lens can receive more light rays, the light transmission amount of the optical system is obviously increased, and the characteristic of large aperture of the optical lens is realized. Meanwhile, the aperture of the rear-end lens can be effectively reduced by controlling the air space between the first lens and the second lens.
In some embodiments, the optical lens satisfies the conditional expression: d2/TTL is less than 0.008, 3.99 < (| f2| + f3)/f is less than 5.53; wherein d2 represents an air space between the second lens and the third lens, f3 represents an effective focal length of the third lens, and f represents an effective focal length of the optical lens. The angle of the light after the light is emitted from the first lens and passes through the second lens and the third lens can be effectively reduced, and therefore aberration caused by too large angle is reduced. Meanwhile, the structure arrangement of the lens can be more compact by controlling the air space between the second lens and the third lens.
In some embodiments, the optical lens satisfies the conditional expression: ET3/ET4 is more than 2.9 and less than 10.9, and CT3/CT4 is more than 1.15 and less than 1.44; wherein ET3 represents the distance from the third lens edge to the stop, ET4 represents the distance from the stop to the fourth lens edge, CT3 represents the center thickness of the third lens, and CT4 represents the center thickness of the fourth lens. The lens meets the above conditions, and the balance of lens aberration is facilitated by controlling the distance between the front lens and the rear lens of the diaphragm, so that the imaging quality is improved.
In some embodiments, the optical lens satisfies the conditional expression: 0.82 < CT5/ET5 < 1.17, 10.06 < | f5/f | < 13.33; wherein CT5 represents a center thickness of the fifth lens, ET5 represents an edge thickness of the fifth lens, f represents an effective focal length of the optical lens, and f5 represents an effective focal length of the fifth lens. The above conditions are satisfied, and the generated aberration can be effectively eliminated and the lens distortion can be improved by controlling the shape of the fifth lens.
In some embodiments, the optical lens satisfies the conditional expression: 0.7 < | f3/f4| < 1; wherein f3 represents the effective focal length of the third lens, and f4 represents the effective focal length of the fourth lens. The lens meets the conditions, light can be smoothly transited between the third lens and the fourth lens, the tolerance generated by the two lenses is reduced, the yield is improved, and the production cost is reduced.
In some embodiments, the third lens, the fourth lens, and the fifth lens are glass aspheric lenses, and the first lens, the second lens, the sixth lens, and the seventh lens are glass spherical lenses. The aspheric lens has the characteristics that: the curvature varies continuously from the center of the lens to the periphery. Unlike a spherical lens having a constant curvature from the center to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has the advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated in imaging can be eliminated as much as possible, so that the imaging quality of the lens is improved. The glass lens can reduce the influence of temperature on the optical back focus of the lens.
The aspheric surface shape of the imaging lens in the embodiments of the present invention satisfies the following equation:
in the formula (I), the compound is shown in the specification,zindicating the distance of the curved surface from the apex of the curved surface in the direction of the optical axis,cthe curvature of the apex of the curved surface is shown,Kthe coefficients of the quadric surface are represented,hthe distance from the optical axis to the curved surface is shown,B、C、D、EandFrepresenting fourth, sixth, eighth, tenth and twelfth order surface coefficients, respectively.
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.
First embodiment
Fig. 1 is a schematic structural diagram of an optical lens 100 according to a first embodiment of the present invention, where the optical 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, an aperture stop ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and a filter G1.
The first lens L1 has negative power, and the object-side surface S1 is a convex surface and the image-side surface S2 is a concave surface, specifically, the first lens L1 is a glass spherical lens;
the second lens L2 has negative power, and the object-side surface S3 is a concave surface, and the image-side surface S4 is a convex surface, specifically, the second lens L2 is a glass spherical lens;
the third lens element L3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6; specifically, the third lens L3 is a glass aspherical lens;
the fourth lens L4 has positive power, and both the object-side surface S7 and the image-side surface S8 are convex surfaces, and specifically, the fourth lens L4 is a glass aspheric lens;
the fifth lens element L5 has positive power, and has a concave object-side surface S8 and a convex image-side surface S10; specifically, the fifth lens L5 is a glass aspherical lens;
the sixth lens element L6 has negative power, and has a concave object-side surface S11 and a concave image-side surface S12; specifically, the sixth lens L6 is a glass spherical lens;
the seventh lens L7 has positive power, and both the object-side surface S13 and the image-side surface S14 are convex surfaces, specifically, the sixth lens L6 and the seventh lens L7 are cemented into a cemented body, and the seventh lens L7 is a glass spherical lens;
the filter G1 is disposed between the seventh lens element L7 and the image plane S17. The parameters associated with each lens of the optical lens 100 structure provided in the first embodiment of the present invention are shown in table 1-1.
TABLE 1-1
The first embodiment of the present invention provides an optical lens 100 in which the surface type coefficients of the aspheric surfaces are shown in tables 1 to 2.
Tables 1 to 2
In the present embodiment, the field curvature diagram and the distortion diagram of the optical lens 100 are shown in fig. 2 and 3, respectively.
The field curvature curve of fig. 2 indicates the degree of curvature of the meridional image plane and the sagittal image plane, the horizontal axis indicates the offset amount (unit: mm), and the vertical axis indicates the half field angle (unit: °). As can be seen from fig. 2, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.1mm, which indicates that the field curvature of the optical lens is better corrected.
The distortion curve in fig. 3 shows the f- θ distortion at different image heights on the image forming plane, the abscissa shows the f- θ distortion (unit:%) and the ordinate shows the half field angle (unit:%). As can be seen from fig. 3, the f- θ distortion at different image heights on the image plane is controlled within ± 2%, which indicates that the distortion of the optical lens is well corrected.
Second embodiment
Fig. 4 is a schematic structural diagram of an optical lens 200 according to a second embodiment of the present invention. The optical lens 200 in the present embodiment is substantially the same as the optical lens 100 in the first embodiment, except that in the present embodiment, the object-side surface of the third lens L3 of the optical lens 200 is a convex surface, the fifth lens L5 is a negative power, and the object-side surface of the sixth lens L6 is a convex surface, and the curvature radii of the lenses are different, and specific parameters of the lenses are shown in table 2-1.
The second embodiment of the present invention provides an optical lens 200 having the relevant parameters of each lens as shown in table 2-1.
TABLE 2-1
The second embodiment of the present invention provides an optical lens 200 in which the surface type coefficients of the aspheric surfaces are shown in table 2-2.
Tables 2 to 2
In the present embodiment, the curvature of field and distortion of the optical lens 200 are shown in fig. 5 and 6, respectively.
The field curvature curve of fig. 5 indicates the degree of curvature of the meridional image plane and the sagittal image plane, the horizontal axis indicates the offset amount (unit: mm), and the vertical axis indicates the half field angle (unit: °). As can be seen from fig. 5, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.1mm, which indicates that the field curvature of the optical lens is better corrected.
The distortion curve in fig. 6 shows the f- θ distortion at different image heights on the image forming plane, the abscissa shows the f- θ distortion (unit:%) and the ordinate shows the half field angle (unit:%). As can be seen from fig. 6, the f- θ distortion at different image heights on the image plane is controlled within ± 2%, which indicates that the distortion of the optical lens is well corrected.
Third embodiment
Fig. 7 is a schematic structural diagram of an optical lens 300 according to a third embodiment of the present invention. The optical lens 300 in this embodiment is substantially the same as the optical lens 100 in the first embodiment, except that the object-side surface of the third lens L3 of the optical lens 300 in this embodiment is a convex surface, the fifth lens L5 is a negative power, and the curvature radii of the lenses are different, and specific parameters of the lenses are shown in table 3-1.
The third embodiment of the present invention provides an optical lens 300 having the relevant parameters of each lens as shown in table 3-1.
TABLE 3-1
The third embodiment of the present invention provides an optical lens 300 having aspheric surface coefficients as shown in table 3-2.
TABLE 3-2
In the present embodiment, the curvature of field and distortion of the optical lens 300 are shown in fig. 8 and 9, respectively.
The field curvature curve of fig. 8 indicates the degree of curvature of the meridional image plane and the sagittal image plane, the horizontal axis indicates the offset amount (unit: mm), and the vertical axis indicates the half field angle (unit: °). As can be seen from fig. 8, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.1mm, which indicates that the field curvature of the optical lens is better corrected.
The distortion curve in fig. 9 shows the f- θ distortion at different image heights on the image forming plane, with the horizontal axis showing the f- θ distortion (unit:%) and the vertical axis showing the half field angle (unit:%). As can be seen from fig. 9, the f- θ distortion at different image heights on the image plane is controlled within ± 2%, which indicates that the distortion of the optical lens is well corrected.
Fourth embodiment
Fig. 10 is a schematic structural diagram of an optical lens 400 according to a third embodiment of the present invention. The optical lens 400 in the present embodiment is substantially the same as the optical lens 100 in the first embodiment, except that the object-side surface of the third lens L3 of the optical lens 400 in the present embodiment is a convex surface, and the curvature radii of the lenses are different, and specific relevant parameters of the lenses are shown in table 4-1.
The fourth embodiment of the present invention provides an optical lens 400 in which the parameters associated with each lens are shown in table 4-1.
TABLE 4-1
The fourth embodiment of the present invention provides an optical lens 400 in which the surface type coefficients of the aspheric surfaces are shown in table 4-2.
TABLE 4-2
In the present embodiment, the curvature of field and distortion of the optical lens 400 are shown in fig. 11 and 12, respectively.
The field curvature curve of fig. 11 indicates the degree of curvature of the meridional image plane and the sagittal image plane, the horizontal axis indicates the offset amount (unit: mm), and the vertical axis indicates the half field angle (unit: °). As can be seen from fig. 11, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.1mm, which indicates that the field curvature of the optical lens is better corrected.
The distortion curve in fig. 12 shows the f- θ distortion at different image heights on the image forming plane, with the horizontal axis showing the f- θ distortion (unit:%) and the vertical axis showing the half field angle (unit:%). As can be seen from fig. 12, the f- θ distortion at different image heights on the image plane is controlled within ± 2%, which indicates that the distortion of the optical lens is well corrected.
Table 5 shows 4 embodiments and their corresponding optical characteristics, including the effective focal length F of the optical lens, F #, the half field angle θ of the optical lens, and the total optical length TTL of the optical lens, and values corresponding to each of the foregoing conditional expressions.
TABLE 5
The above embodiments are combined to achieve the following optical indexes: the field angle: 2 theta > 143 DEG; total optical length: TTL is less than or equal to 28 mm.
In the optical lens provided by the invention, each lens has the following functions:
(1) the first lens L1 is used for collecting light rays, so that the imaging system can correct the aberration subsequently, and meanwhile, the first lens L1 is matched with the second lens to receive more light rays, increase the light flux and reduce the volume of the rear-end lens.
(2) The third lens L3 and the fourth lens L4 are matched for balancing phase difference, so that light rays are in smooth transition, and meanwhile, the third lens L3 and the fourth lens L4 are matched with the fifth lens which is aspheric, so that distortion is effectively corrected, aberration is eliminated, and imaging quality is improved.
(3) The positive and negative lens abbe numbers Vd of the adhesive body formed by the sixth lens L6 and the seventh lens L7 have larger difference, and chromatic aberration can be effectively corrected.
The invention adopts a structure of seven lenses, and realizes the high resolution of the optical lens by optimally setting the shapes of the lenses, reasonably distributing the focal power of each lens, forming a cemented lens and the like; compared with the existing 8M lens, the optical lens has the characteristics of small volume, high resolution and large aperture, and particularly the existing lens in the existing market is mostly 1.8-2.0 in aperture number, the aperture number of the optical lens is 1.6, the light transmission amount is obviously improved, the lens also has a good imaging effect in a dark environment, and meanwhile, the optical lens can be matched with the current 8M chip with high pixel and high resolution, so that the market requirement is met.
Fifth embodiment
As shown in fig. 13, the present embodiment provides an imaging apparatus 500, which includes the on-vehicle imaging lens (e.g., optical lens 100) and the imaging element 50 in any of the above embodiments, wherein the imaging element 50 converts the optical image formed by the optical lens 100 into an electrical signal.
Further, the imaging element 50 may be a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and may also be a CCD (Charge Coupled Device) image sensor.
Further, the imaging device 500 may be an in-vehicle camera, an in-vehicle monitor, or the like.
The imaging device 500 provided by the embodiment includes the optical lens 100, and since the optical lens 100 adopts a combination of a spherical glass surface and an aspherical surface, various aberrations of the imaging system are better corrected, so that the imaging device 500 provided by the embodiment has the characteristics of high resolution, good imaging effect and the like.
The above examples are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (9)
1. An optical lens system comprising seven lens elements, sequentially arranged along an optical axis from an object side to an image plane, comprising:
the first lens with negative focal power has a convex object-side surface and a concave image-side surface;
the second lens with negative 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 object side surface of the third lens is a concave surface or a convex surface, and the image side surface of the third lens is a convex surface;
a diaphragm;
the fourth lens with positive focal power has a convex object-side surface and a convex image-side surface;
a fifth lens element with a focal power, wherein the object-side surface of the fifth lens element is concave and the image-side surface of the fifth lens element is convex;
the object side surface of the sixth lens is a convex surface or a concave surface, and the image side surface of the sixth lens is a concave surface;
the object side surface and the image side surface of the seventh lens are convex surfaces;
the sixth lens and the seventh lens are glued into a glue body, and the optical centers of the lenses are positioned on the same straight line;
the optical lens satisfies the conditional expression: TTL/D is more than 2.18 and less than 2.34; wherein, TTL represents the optical total length of the optical lens, D represents the maximum light-passing aperture of the optical lens;
the optical lens satisfies the conditional expression: d1/TTL > 0.13, 1.26 < | R2/f1| + | R3/f2| < 1.49; wherein d1 represents the air space between the first and second lenses, R2 represents the radius of curvature of the image side surface of the first lens, R3 represents the radius of curvature of the object side surface of the second lens, f1 represents the effective focal length of the first lens, and f2 represents the effective focal length of the second lens.
2. An optical lens according to claim 1, characterized in that the optical lens satisfies the conditional expression: nd6/Nd7 is less than 1.16, Vd6/Vd7 is less than 0.35; wherein Vd6 represents an abbe number of the sixth lens, Vd7 represents an abbe number of the seventh lens, Nd6 represents a refractive index of the sixth lens, and Nd7 represents a refractive index of the seventh lens.
3. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: theta/IH2< 3.354 °/mm; wherein θ represents a half field angle of the optical lens, and IH represents an image height of the optical lens at the half field angle θ.
4. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: d2/TTL is less than 0.008, 3.99 < (| f2| + f3)/f is less than 5.53; wherein d2 represents an air space between the second lens and the third lens, f3 represents an effective focal length of the third lens, and f represents an effective focal length of the optical lens.
5. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: ET3/ET4 is more than 2.9 and less than 10.9, and CT3/CT4 is more than 1.15 and less than 1.44; wherein ET3 represents the distance from the third lens edge to the stop, ET4 represents the distance from the stop to the fourth lens edge, CT3 represents the center thickness of the third lens, and CT4 represents the center thickness of the fourth lens.
6. An optical lens according to claim 1, characterized in that the optical lens satisfies the conditional expression: 0.82 < CT5/ET5 < 1.17, 10.06 < | f5/f | < 13.33; wherein CT5 represents a center thickness of the fifth lens, ET5 represents an edge thickness of the fifth lens, f represents an effective focal length of the optical lens, and f5 represents an effective focal length of the fifth lens.
7. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: 0.7 < | f3/f4| < 1; wherein f3 represents the effective focal length of the third lens, and f4 represents the effective focal length of the fourth lens.
8. An optical lens according to claim 1, wherein the third lens, the fourth lens and the fifth lens are glass aspherical lenses, and the first lens, the second lens, the sixth lens and the seventh lens are glass spherical lenses.
9. An imaging apparatus comprising the optical lens according to any one of claims 1 to 8 and an imaging element for converting an optical image formed by the optical lens into an electric signal.
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| JP6844087B2 (en) * | 2019-08-20 | 2021-03-17 | エスゼット ディージェイアイ テクノロジー カンパニー リミテッドＳｚ Ｄｊｉ Ｔｅｃｈｎｏｌｏｇｙ Ｃｏ．，Ｌｔｄ | Lens system, image pickup device, and moving object |
| CN112485890B (en) * | 2020-11-26 | 2022-03-04 | 江西联创电子有限公司 | Optical imaging lens and imaging apparatus |
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