CN116381913B - optical lens - Google Patents
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- CN116381913B CN116381913B CN202310642969.8A CN202310642969A CN116381913B CN 116381913 B CN116381913 B CN 116381913B CN 202310642969 A CN202310642969 A CN 202310642969A CN 116381913 B CN116381913 B CN 116381913B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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Abstract
The invention discloses an optical lens, which sequentially comprises 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 with negative focal power, the object side of which is a concave surface; a third lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a diaphragm; a fourth lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a fifth lens with negative focal power, the object side surface of which is a concave surface; a sixth lens with positive focal power, the object side surface of which is a convex surface; an optical filter. The invention can realize the equilibrium of day-night confocal, large field angle and long back focus.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to an optical lens.
Background
The day and night confocal lens is a system capable of simultaneously sharing the same optical system for imaging in the RGB light source and the infrared light source, and has the advantages that optical devices do not need to be replaced, the technology is widely adopted in the fields of vehicle-mounted, security protection and the like at present, and the technology is a development trend of future markets.
However, most of the existing day and night confocal lenses for vehicle-mounted and security protection have the defects of insufficient definition and large infrared visible defocus amount, and are difficult to simultaneously realize the definition requirement of imaging at daytime and night; meanwhile, the problems of severely reduced definition and large temperature drift in high and low temperature environments exist, the requirements of many vehicle-mounted and security occasions on the appearance of the lens cannot be met, the peripheral brightness of an imaging picture of the lens is insufficient, and the relative illuminance is low.
Therefore, there is a need to design a high-pixel, large-field angle and long-back focus day-night confocal lens.
Disclosure of Invention
Therefore, the present invention aims to provide an optical lens having at least the advantages of high pixel, large field angle and long back focus.
The invention provides an optical lens, which sequentially comprises 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 with negative focal power, the object side of which is a concave surface; a third lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a diaphragm; a fourth lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a fifth lens with negative focal power, the object side surface of which is a concave surface; a sixth lens with positive focal power, the object side surface of which is a convex surface; a light filter; the optical lens satisfies the following conditional expression: 1.0 < (TIR+f)/(TAR+EFL) < 1.05; wherein, TIR represents the thickness of the optical filter when the light source is RGB, f represents the effective focal length of the optical lens when the light source is RGB, TAR represents the thickness of the optical filter when the light source is infrared, and EFL represents the effective focal length of the optical lens when the light source is infrared.
Compared with the prior art, the optical lens provided by the invention is composed of six lenses, and has the characteristics of day-night confocal, high pixel, large field angle, large aperture and long back focus through specific surface shape collocation and reasonable focal power distribution.
Drawings
Fig. 1 is a schematic structural diagram of an optical lens according to a first embodiment of the present invention.
Fig. 2 is a distortion graph of an optical lens according to a first embodiment of the present invention.
Fig. 3 is a graph showing a field curvature of an optical lens according to a first embodiment of the present invention.
Fig. 4 is a vertical axis chromatic aberration diagram of an optical lens according to a first embodiment of the present invention.
Fig. 5 is a graph showing the central field of view TF of an RGB light source of an optical lens according to a first embodiment of the present invention.
Fig. 6 is a graph showing a central field of view TF of an infrared light source of an optical lens according to a first embodiment of the present invention.
Fig. 7 is a schematic structural diagram of an optical lens according to a second embodiment of the present invention.
Fig. 8 is a distortion graph of an optical lens according to a second embodiment of the present invention.
Fig. 9 is a field curvature chart of an optical lens according to a second embodiment of the present invention.
Fig. 10 is a vertical axis chromatic aberration diagram of an optical lens according to a second embodiment of the present invention.
Fig. 11 is a graph showing the central field of view TF of an RGB light source of an optical lens according to a second embodiment of the present invention.
Fig. 12 is a graph showing a central field of view TF of an infrared light source of an optical lens according to a second embodiment of the present invention.
Fig. 13 is a schematic structural diagram of an optical lens according to a third embodiment of the present invention.
Fig. 14 is a distortion graph of an optical lens according to a third embodiment of the present invention.
Fig. 15 is a field curvature chart of an optical lens according to a third embodiment of the present invention.
Fig. 16 is a vertical axis chromatic aberration diagram of an optical lens according to a third embodiment of the present invention.
Fig. 17 is a graph showing the central field of view TF of an RGB light source of an optical lens according to a third embodiment of the present invention.
Fig. 18 is a graph showing a central field of view TF of an infrared light source of an optical lens according to a third embodiment of the present invention.
FIG. 19 is a diagram showing the thickness variation of the optical filter when the light source is switched according to the present invention.
Detailed Description
In order that the objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. Several embodiments of the invention are presented in the figures. 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 lens, which sequentially comprises from an object side to an imaging surface along an optical axis: the optical centers of the first lens, the second lens, the third lens, the diaphragm, the fourth lens, the fifth lens, the sixth lens and the optical filter are positioned on the same straight line.
Specifically, the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface; the third lens has positive focal power, the object side surface of the third lens is a convex surface, 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 convex surface, and the image side surface of the fourth lens is a convex surface; the fifth lens has negative focal power, the object side surface of the fifth lens is concave, and the image side surface of the fifth lens is convex at a paraxial region; the sixth lens has positive focal power, the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface; the first lens and the third lens are glass spherical lenses, and the second lens, the fourth lens, the fifth lens and the sixth lens are plastic aspherical lenses.
The invention adopts the combination of two glass spherical lenses and four plastic aspherical lenses and reasonably restricts the surface and focal power of each lens, so that the optical lens has the characteristics of compact structure, high pixels, large aperture, small distortion, day and night confocal, large field angle, long back focal and the like.
In some embodiments, the thickness TIR of the optical filter when the light source is RGB, the effective focal length f of the optical lens when the light source is RGB, the thickness TAR of the optical filter when the light source is infrared, and the effective focal length EFL of the optical lens when the light source is infrared satisfy: 1.0 < (TIR+f)/(TAR+EFL) < 1.05. The focal length of the two light sources and the thickness of the corresponding optical filter are reasonably set, so that the influence of the switching optical filter on the optical lens can be effectively reduced, the imaging quality of the optical lens under the two light sources is improved, day-night confocal high-definition imaging is realized, and particularly, the focal length of the optical lens under the two light sources is small in defocus difference of a central view field of the optical lens under the two light sources as shown in fig. 5, 6, 11, 12, 17 and 18, and six lenses are unchanged except for the thickness change of the optical filter when the light sources are switched as shown in fig. 19.
In some embodiments, the effective focal length f1 of the first lens and the center thickness CT1 of the first lens satisfy: -15.0 < f1/CT1 < -5.0. The optical lens has the advantages that the range is met, the ratio of the center thickness of the first lens to the effective focal length is reasonably controlled, the first lens focal length is prevented from being greatly changed due to overlarge change of the center thickness of the first lens, the integral imaging of the optical lens is affected, the sensitivity of the optical lens can be effectively reduced, the assembly of the optical lens is facilitated, and the production yield is improved.
In some embodiments, the center thickness CT3 of the third lens and the effective aperture DM3 of the third lens satisfy: CT3/DM3 is more than 0.8 and less than 1.4; the effective aperture DM1 of the first lens and the effective aperture DM3 of the third lens satisfy: 1.6 < DM1/DM3 < 2.0. The range is satisfied, the ratio of the effective caliber of the first lens to the effective caliber of the third lens is reasonably controlled, the bending shape of the third lens is controlled by controlling the ratio of the central thickness of the third lens to the effective caliber of the third lens, the turning trend of light can be effectively slowed down, the aberration and distortion of the field of view outside the axis can be effectively corrected, meanwhile, the difference of the effective calibers of the lenses is reduced, the assembly of the optical lens is facilitated, and the production yield is improved.
In some embodiments, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, and the effective focal length f of the optical lens when the light source is RGB satisfy: -1.6 < (f1+f2+f3)/f < -1.2. The optical power of the first lens to the optical power of the third lens are reasonably configured, so that coma correction of an off-axis visual field is enhanced, simultaneously, curvature of field and aberration can be well converged, the back focal length of the optical lens can be increased, and interference between the lens and a chip is avoided.
In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens and the maximum half field angle θ of the optical lens when the light source is RGB satisfy: TTL/(f×tan. Theta.) is 0.5 < 0.7. The optical lens can be miniaturized and balanced in large angle of view by reasonably controlling the relation between the total length of the optical lens and the effective focal length and the maximum half angle of view, and increasing the angle of view while shortening the total length of the optical lens.
In some embodiments, the maximum half field angle θ of the optical lens and the image height IH corresponding to the maximum half field angle of the optical lens satisfy: 15 DEG/mm < theta/IH < 25 DEG/mm. The range is satisfied, and the ratio of the maximum half field angle to the half image height of the optical lens is reasonably controlled, so that the image surface can be reasonably increased while the field angle is increased, the balance between the large field angle and the large image surface of the optical lens is realized, and day and night confocal is further realized.
In some embodiments, the radius of curvature R41 of the object-side surface of the fourth lens element, the radius of curvature R42 of the image-side surface of the fourth lens element and the effective focal length f4 of the fourth lens element satisfy: -0.25 < (R41+R42)/f 4 < 0.1. The lens meets the above range, and the surface type and focal length of the fourth lens are reasonably controlled, so that the sensitivity of the optical lens is reduced, the molding difficulty of the lens is reduced, the manufacturing yield of the lens is improved, stray light generated by the optical lens is reduced, and the imaging quality of the optical lens is improved.
In some embodiments, the effective focal length f2 of the second lens and the effective focal length f of the optical lens when the light source is RGB satisfy: -2.0 < f2/f < -0.5; the air space CT12 on the optical axis between the first lens and the second lens and the air space CT23 on the optical axis between the second lens and the third lens satisfy: CT12/CT23 is more than 30 and less than 60. The optical lens has the advantages that the range is met, the deflection angle of light can be effectively slowed down by reasonably controlling the focal length of the second lens and the distance between the second lens and the front lens and the distance between the second lens and the rear lens, and the correction difficulty of aberration is reduced, so that the imaging quality of the optical lens is improved.
In some embodiments, the center thickness CT4 of the fourth lens, the center thickness CT5 of the fifth lens, and the total optical length TTL of the optical lens satisfy: 0.1 < (CT4+CT5)/TTL < 0.2; CT4/CT5 is more than 4.5 and less than 7.0. The lens has the advantages that the central thicknesses of the fourth lens and the fifth lens are reasonably set, so that uneven filling of plastic resin materials during molding of the lens due to the fact that the fifth lens is too thin can be avoided, or interference fit of the lens and the lens barrel is caused in the assembling process due to the fact that the thickness of the fourth lens is too thick, and the imaging effect of the optical lens is affected.
In some embodiments, the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, and the air separation CT56 on the optical axis between the fifth lens and the sixth lens satisfy: 2.0 < (f5+f6)/CT 56 < 5.0. The optical lens has the advantages that the range is met, the focal lengths of the fifth lens and the sixth lens are reasonably set, so that various aberrations of the optical lens are balanced, the marginal view field light converging capability is improved, and the imaging quality of the optical lens is improved.
In some embodiments, the optical back focal length BFL of the optical lens and the optical total length TTL of the optical lens satisfy: BFL/TTL is more than 0.2 and less than 0.4. The optical lens can be placed into the optical filter switching device under the condition of long back focus without interference by reasonably controlling the ratio of the optical back focus of the optical lens to the total length of the optical lens, and the optical lens is favorable for realizing day and night confocal.
In some embodiments, the sagittal height SAG61 of the sixth lens object side and the center thickness CT6 of the sixth lens satisfy: SAG61/CT6 is more than 0.2 and less than 0.5. The ratio of the sagittal height to the center thickness of the object side surface of the sixth lens can be properly adjusted to meet the above range, which is beneficial to lens manufacturing and molding, improves the manufacturing yield and is beneficial to shortening the total length of the optical lens.
In some embodiments, the radius of curvature R11 of the first lens object-side surface and the radius of curvature R12 of the first lens image-side surface satisfy: 0.6 < (R11-R12)/(R11+R12) < 0.9. The range is satisfied, the off-axis aberration can be corrected by reasonably limiting the surface shape of the first lens, and the light rays can have proper incidence angle and emergence angle in the first lens, thereby being beneficial to increasing the field angle and the image surface and reducing the outer diameter of the front lens of the lens.
In some embodiments, the sagittal height SAG51 of the fifth lens object side, the sagittal height SAG52 of the fifth lens image side, and the effective caliber DM52 of the fifth lens image side satisfy: 0.3 < (SAG 52-SAG 51)/DM 52 < 0.5. The range is satisfied, and the sagittal height and caliber relation of the fifth lens are reasonably set, so that the distribution of the incident angles of light rays can be effectively controlled, and the correction of the advanced aberration of the optical lens is facilitated.
In some embodiments, the effective focal length f of the optical lens and the entrance pupil diameter EPD of the optical lens when the light source is RGB satisfy: 2.1 < f/EPD < 2.2. The range is satisfied, the ratio of the effective focal length to the entrance pupil diameter of the optical lens is reasonably controlled, so that the optical lens has the characteristic of a large aperture, and particularly, when the optical lens images in a dark environment, the noise influence caused by too weak light can be reduced, thereby improving the imaging quality, and enabling the optical lens to satisfy the imaging requirements under different luminous fluxes.
In some embodiments, the image height IH corresponding to the maximum half field angle of the optical lens and the effective focal length f of the optical lens when the light source is RGB satisfy: IH/f is more than 1.1 and less than 1.3. The range is satisfied, the ratio of the half image height to the effective focal length of the optical lens is reasonably controlled, so that the integral image height of the optical lens changes along with the focal length on the basis of imaging at a large field angle, the focusing efficiency of light rays on an image surface is favorably slowed down, and the correction difficulty of spherical aberration and chromatic aberration in the optical lens is reduced.
In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens when the light source is RGB satisfy: TTL/f is more than 4.0 and less than 6.0. The range is satisfied, the ratio of the total length of each lens to the effective focal length can be reduced by reasonably controlling the ratio of the total length of the optical lens, the back focal length is effectively increased, and the interference between the lens and the chip is avoided.
In some embodiments, the material refractive index Nd3 of the third lens and the center thickness CT3 of the third lens satisfy: nd3/CT3 is more than 0.45 and less than 0.85. The range is satisfied, and the ratio of the refractive index of the material of the third lens to the center thickness is reasonably set, so that the influence of the third lens on the back focus offset under the high-low temperature condition is reduced, and the temperature performance of the optical lens is improved.
As an implementation mode, a glass-plastic mixed collocation structure of two glass spherical lenses and four plastic aspherical lenses is adopted, and the structure is compact by reasonably restraining the surface type and the focal power of each lens, so that the characteristics of day-night confocal, small distortion, large field angle, large aperture and long back focus are realized. The first lens and the third lens are made of glass spherical materials, and the geometrical chromatic aberration of the optical system is effectively corrected through the low-dispersion characteristic of glass; the second lens, the fourth lens, the fifth lens and the sixth lens adopt plastic aspheric lenses, so that the cost can be effectively reduced, the aberration can be corrected, and an optical performance product with higher cost performance can be provided.
In the embodiment of the invention, when the lens in the optical lens is an aspherical lens, the aspherical surface types of the lens all satisfy the following equations:
；
where z is the distance sagittal height from the aspherical surface vertex when the aspherical surface is at a position of height h in the optical axis direction, c is the paraxial curvature of the surface, k is the quadric coefficient, A 2i The aspherical surface profile coefficient of the 2 i-th order.
The invention is further illustrated in the following examples. In various embodiments, the thickness, radius of curvature, and material selection portion of each lens in the optical lens may vary, and for specific differences, reference may be made to the parameter tables of the various embodiments. The following examples are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following examples, and any other changes, substitutions, combinations or simplifications that do not depart from the gist of the present invention are intended to be equivalent substitutes within the scope of the present invention.
First embodiment
Referring to fig. 1, a schematic structural diagram of an optical lens 100 according to a first embodiment of the present invention is shown, where the optical lens 100 includes, in order from an object side to an imaging surface S15 along an optical axis: a first lens L1, a second lens L2, a third lens L3, a stop ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter G1.
Specifically, the first lens element L1 has negative refractive power, wherein an object-side surface S1 of the first lens element is convex, and an image-side surface S2 of the first lens element is concave; the second lens L2 has negative focal power, the object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a concave surface; the third lens element L3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is convex; the fourth lens element L4 has positive refractive power, wherein an object-side surface S7 of the fourth lens element is convex, and an image-side surface S8 of the fourth lens element is convex; the fifth lens element L5 has negative refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex at a paraxial region; the sixth lens element L6 with positive refractive power has a convex object-side surface S11 and a convex image-side surface S12; the object side surface of the optical filter G1 is S13, and the object side surface is S14; the first lens L1 and the third lens L3 are glass spherical lenses, and the second lens L2, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are plastic aspherical lenses.
The design parameters of each lens of the optical lens 100 provided in this embodiment are shown in table 1.
TABLE 1
The aspherical surface profile coefficients of the optical lens 100 in this embodiment are shown in table 2.
TABLE 2
Referring to fig. 2, 3, 4, 5 and 6, a distortion curve graph, a field curvature graph, a vertical axis chromatic aberration curve graph, an RGB light source central field TF curve graph and an infrared light source central field TF curve graph of the optical lens 100 are shown. As can be seen from the graph, the F-Theta distortion of the optical lens is less than 25%, the offset of the field curvature is controlled within +/-0.04 mm, the offset of the vertical axis chromatic aberration is controlled within +/-5 mu m, and the defocus value of the central view field of the two light sources is controlled within +/-0.003 mm.
Second embodiment
Referring to fig. 7, a schematic structural diagram of an optical lens 200 according to a second embodiment of the present invention is shown, and the optical lens 200 according to the present embodiment is substantially the same as the first embodiment described above, and the difference is mainly that the radius of curvature, the aspheric coefficients and the thickness of each lens surface are different.
Specifically, the design parameters of the optical lens 200 provided in this embodiment are shown in table 3.
TABLE 3 Table 3
The aspherical surface profile coefficients of the optical lens 200 in this embodiment are shown in table 4.
TABLE 4 Table 4
Referring to fig. 8, 9, 10, 11 and 12, a distortion curve, a field curvature curve, a vertical chromatic aberration curve, an RGB light source central field TF curve and an infrared light source central field TF curve of the optical lens 200 are shown. As can be seen from the graph, the F-Theta distortion of the optical lens is less than 25%, the offset of the field curvature is controlled within +/-0.03 mm, the offset of the vertical axis chromatic aberration is controlled within +/-4 mu m, and the defocus value of the central view field of the two light sources is controlled within +/-0.005 mm.
Third embodiment
Referring to fig. 13, a schematic structural diagram of an optical lens 300 according to a third embodiment of the present invention is shown, and the optical lens 300 of the present embodiment is substantially the same as the first embodiment described above, and the difference is mainly that the radius of curvature, the aspheric coefficients and the thickness of each lens surface are different.
Specifically, the design parameters of the optical lens 300 provided in this embodiment are shown in table 5.
TABLE 5
The aspherical surface profile coefficients of the optical lens 300 in this embodiment are shown in table 6.
TABLE 6
Referring to fig. 14, 15, 16, 17 and 18, a distortion curve, a field curvature curve, a vertical chromatic aberration curve, an RGB light source central field TF curve and an infrared light source central field TF curve of the optical lens 300 are shown. As can be seen from the graph, the F-Theta distortion of the optical lens is less than 25%, the offset of the field curvature is controlled within +/-0.06 mm, the offset of the vertical axis chromatic aberration is controlled within +/-4.5 mu m, and the defocus value of the central field of view of the two light sources is controlled within +/-0.004 mm.
Referring to table 7, the optical characteristics of the optical lens provided in the above three embodiments, including the maximum field angle 2θ, the total optical length TTL, the actual half image height IH, the effective focal length f, the entrance pupil diameter EPD, and the correlation values corresponding to each of the above conditions, are shown.
TABLE 7
Compared with the prior art, the optical lens provided by the invention has at least the following advantages:
(1) Because the optical lens provided by the invention has better light transmittance and higher refractive index, the optical quality of the optical lens provided by the invention can be basically consistent with that of the currently mainstream 6-piece plastic lens by adopting 2 pieces of glass lenses and 4 pieces of plastic lenses, and the optical lens has better light transmittance and optical performance, so that high-definition imaging of the lens is realized.
(2) The optical lens provided by the invention adopts 6 glass-plastic mixed lens combinations, meets the day-night confocal requirement of the lens through specific surface shape collocation and reasonable focal power distribution, and has the advantages of large field angle, long back focus, small distortion, large aperture, good temperature performance and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. 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 foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (9)
1. An optical lens comprising six lenses in order from an object side to an imaging surface along an optical axis, comprising:
a first lens with negative focal power, 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 with negative focal power, wherein the object side surface of the second lens is a concave surface;
a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;
a diaphragm;
a fourth lens element with positive refractive power, wherein the object-side surface of the fourth lens element is convex, and the image-side surface of the fourth lens element is convex;
a fifth lens with negative focal power, wherein the object side surface of the fifth lens is a concave surface;
a sixth lens having positive optical power, an object side surface of the sixth lens being a convex surface;
a light filter;
the optical lens satisfies the following conditional expression:
1.0＜(TIR+f)/(TAR+EFL)＜1.05；
0.5＜TTL/(f×tanθ)＜0.7；
wherein, TIR represents the thickness of the optical filter when the light source is RGB, f represents the effective focal length of the optical lens when the light source is RGB, TAR represents the thickness of the optical filter when the light source is infrared, EFL represents the effective focal length of the optical lens when the light source is infrared, θ represents the maximum half field angle of the optical lens, and TTL represents the total optical length of the optical lens.
2. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
-15.0＜f1/CT1＜-5.0；
wherein f1 represents an effective focal length of the first lens, and CT1 represents a center thickness of the first lens.
3. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
0.8＜CT3/DM3＜1.4；
1.6＜DM1/DM3＜2.0；
wherein CT3 represents the center thickness of the third lens, DM1 represents the effective aperture of the first lens, and DM3 represents the effective aperture of the third lens.
4. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
-1.6＜(f1+f2+f3)/f＜-1.2；
wherein f1 represents an effective focal length of the first lens, f2 represents an effective focal length of the second lens, f3 represents an effective focal length of the third lens, and f represents an effective focal length of the optical lens when the light source is RGB.
5. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
15°/mm＜θ/IH＜25°/mm；
wherein θ represents the maximum half field angle of the optical lens, and IH represents the image height corresponding to the maximum half field angle of the optical lens.
6. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
-0.25＜(R41+R42)/f4＜0.1；
wherein R41 represents a radius of curvature of the object side surface of the fourth lens element, R42 represents a radius of curvature of the image side surface of the fourth lens element, and f4 represents an effective focal length of the fourth lens element.
7. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
-2.0＜f2/f＜-0.5；
30＜CT12/CT23＜60；
wherein f2 denotes an effective focal length of the second lens, f denotes an effective focal length of the optical lens when the light source is RGB, CT12 denotes an air space on the optical axis between the first lens and the second lens, and CT23 denotes an air space on the optical axis between the second lens and the third lens.
8. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
0.1＜(CT4+CT5)/TTL＜0.2；
4.5＜CT4/CT5＜7.0；
wherein CT4 represents the center thickness of the fourth lens, CT5 represents the center thickness of the fifth lens, and TTL represents the total optical length of the optical lens.
9. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
2.0＜(f5+f6)/CT56＜5.0；
where f5 denotes an effective focal length of the fifth lens, f6 denotes an effective focal length of the sixth lens, and CT56 denotes an air space between the fifth lens and the sixth lens on the optical axis.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110646919A (en) * | 2019-08-22 | 2020-01-03 | 江西联创电子有限公司 | Fisheye lens |
| CN215067497U (en) * | 2021-07-23 | 2021-12-07 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN114089512A (en) * | 2022-01-24 | 2022-02-25 | 江西联益光学有限公司 | Optical lens and imaging apparatus |
| CN114859501A (en) * | 2021-02-04 | 2022-08-05 | 宁波舜宇车载光学技术有限公司 | Optical lens and electronic device |
| CN115933117A (en) * | 2022-11-16 | 2023-04-07 | 中山联合光电研究院有限公司 | Day and night confocal lens and imaging device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110646919A (en) * | 2019-08-22 | 2020-01-03 | 江西联创电子有限公司 | Fisheye lens |
| CN114859501A (en) * | 2021-02-04 | 2022-08-05 | 宁波舜宇车载光学技术有限公司 | Optical lens and electronic device |
| CN215067497U (en) * | 2021-07-23 | 2021-12-07 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN114089512A (en) * | 2022-01-24 | 2022-02-25 | 江西联益光学有限公司 | Optical lens and imaging apparatus |
| CN115933117A (en) * | 2022-11-16 | 2023-04-07 | 中山联合光电研究院有限公司 | Day and night confocal lens and imaging device |
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