CN113467059A - Infrared confocal wide-angle lens - Google Patents
Infrared confocal wide-angle lens Download PDFInfo
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- CN113467059A CN113467059A CN202111029247.2A CN202111029247A CN113467059A CN 113467059 A CN113467059 A CN 113467059A CN 202111029247 A CN202111029247 A CN 202111029247A CN 113467059 A CN113467059 A CN 113467059A
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Abstract
The invention provides an infrared confocal wide-angle lens, which sequentially comprises the following components 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 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 diaphragm; a third lens having a positive refractive power, both the object-side surface and the image-side surface of the third lens being convex; a fourth lens element having a negative optical power, wherein both the object-side surface and the image-side surface of the fourth lens element are concave; a fifth lens element having a positive refractive power, the object-side surface and the image-side surface of the fifth lens element being convex; a sixth lens element with negative optical power, having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the infrared confocal wide-angle lens meets the conditional expression: FOV is more than or equal to 160 degrees and less than or equal to 180 degrees, f/TTL is more than 0.2 and less than 0.3, wherein: the FOV represents the maximum field angle of the infrared confocal wide-angle lens, f represents the effective focal length of the infrared confocal wide-angle lens, and TTL represents the distance from the object side surface of the first lens to the imaging surface on the optical axis.
Description
Technical Field
The invention relates to the technical field of optical lenses, in particular to an infrared confocal wide-angle lens.
Background
The infrared confocal lens is a lens technical specification proposed by the current vehicle-mounted and security industries, and is a development trend of the future market. However, most of the existing infrared confocal lenses for vehicle-mounted and security protection generally have the technical problems that the infrared visible defocusing amount is large, the high definition requirement of imaging in the daytime and at night is difficult to realize at the same time, the definition is seriously reduced in a high-temperature and low-temperature environment, the manufacturing cost is high, the temperature drift is large, a finished product is not light enough, and the dark angle phenomenon exists around the finished product.
Disclosure of Invention
The present application provides an infrared confocal wide-angle lens applicable to vehicle-mounted installation that can overcome at least one of the above-mentioned drawbacks in the prior art.
The invention provides an infrared confocal wide-angle lens, which sequentially comprises the following components 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 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 diaphragm;
a third lens having a positive refractive power, both the object-side surface and the image-side surface of the third lens being convex;
a fourth lens element having a negative optical power, wherein both the object-side surface and the image-side surface of the fourth lens element are concave;
a fifth lens element having a positive refractive power, the object-side surface and the image-side surface of the fifth lens element being convex;
a sixth lens element with negative optical power having a convex object-side surface at the paraxial region and a concave image-side surface at the paraxial region.
The infrared confocal wide-angle lens meets the conditional expression: FOV is more than or equal to 160 degrees and less than or equal to 180 degrees, f/TTL is more than 0.2 and less than 0.3, wherein: the FOV represents the maximum field angle of the infrared confocal wide-angle lens, f represents the effective focal length of the infrared confocal wide-angle lens, and TTL represents the distance from the object side surface of the first lens to the imaging surface on the optical axis.
Further, a combined focal length f12 of the first lens and the second lens and an effective focal length f of the infrared confocal wide-angle lens satisfy the relation: -5 < f12/f < -1.
Further, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy the relation: -0.5 < f1/f2 < 0.1.
Further, the edge face inclination angle theta of the object side face of the first lens1And the maximum field angle FOV of the infrared confocal wide-angle lens satisfies the relational expression: theta is more than 0.041/FOV＜0.10。
Further, the edge face inclination angle theta of the object side face of the sixth lens12The inclination angle theta of the edge surface of the image side surface of the sixth lens is13Satisfy the relation: theta is more than 1.012/θ13＜1.5。
Further, a separation distance CT45 between the fourth lens and the fifth lens on the optical axis, a separation distance ET45 between the fourth lens and the fifth lens at the effective diameter edge, and a distance TTL between the object side surface of the first lens and the imaging surface on the optical axis satisfy the following relations: 0.01 < (CT 45+ ET 45)/TTL < 0.03.
Further, the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy the relation: 0.5 < | f4/f5| < 1.5.
Further, SAGs 41, 42, 51 and 52 of the object-side surface and the image-side surface of the fourth lens satisfy the following relations: -25 < (SAG 51+ SAG 52)/(SAG 41+ SAG 42) < 5.
Further, saga 11 of the object side surface of the first lens and the effective aperture D11 of the object side surface of the first lens satisfy the relation: 0.05 < SAG11/D11 < 0.20.
Further, saga 11 of the object side surface of the first lens and a thickness CT1 of the first lens on the optical axis satisfy the relation: 0.5 < SAG11/CT1 < 1.5.
Compared with the prior art, the beneficial effects of the application are that: by adopting a six-lens structure, the shape of the lenses is optimized, the focal power of each lens is reasonably distributed, the cemented lens is formed, and the like, so that at least one of the beneficial effects of visible light and infrared confocal property, high resolution in daytime and night, good temperature performance, low manufacturing cost, small temperature drift, light finished product, no dark angle phenomenon at the periphery and the like of the infrared confocal wide-angle lens is realized.
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 infrared confocal wide-angle lens in a first embodiment of the present application;
FIG. 2 is a graph of MTF of visible light of an infrared confocal wide-angle lens according to a first embodiment of the present application;
FIG. 3 is a graph of an infrared MTF curve of an infrared confocal wide-angle lens according to a first embodiment of the present application;
FIG. 4 is a graph of axial chromatic aberration of an infrared confocal wide-angle lens according to a first embodiment of the present application;
FIG. 5 is a schematic diagram of an infrared confocal wide-angle lens according to a second embodiment of the present application;
FIG. 6 is a graph of MTF of visible light of an infrared confocal wide-angle lens according to a second embodiment of the present application;
FIG. 7 is a graph of an infrared MTF curve of an infrared confocal wide-angle lens according to a second embodiment of the present application;
FIG. 8 is a graph of axial chromatic aberration of an infrared confocal wide-angle lens according to a second embodiment of the present application;
fig. 9 is a schematic structural diagram of an infrared confocal wide-angle lens in a third embodiment of the present application;
FIG. 10 is a graph of MTF of visible light of an infrared confocal wide-angle lens according to a third embodiment of the present application;
FIG. 11 is a graph of an infrared MTF curve of an infrared confocal wide-angle lens according to a third embodiment of the present application;
fig. 12 is a graph of axial chromatic aberration of an infrared confocal wide-angle lens in a third embodiment of the present application.
Description of the main element symbols:
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application. It should be understood that the detailed description describes exemplary embodiments of the application, and is not intended to limit the scope of the application in any way. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens, and the first cemented lens may also be referred to as the second cemented lens, without departing from the teachings of the present application.
The embodiment of the present invention provides an infrared confocal wide-angle lens, which sequentially includes, 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 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 diaphragm;
a third lens having a positive refractive power, both the object-side surface and the image-side surface of the third lens being convex;
a fourth lens element having a negative optical power, wherein both the object-side surface and the image-side surface of the fourth lens element are concave;
a fifth lens element having a positive refractive power, the object-side surface and the image-side surface of the fifth lens element being convex;
a sixth lens element with negative optical power having a convex object-side surface at the paraxial region and a concave image-side surface at the paraxial region.
In some embodiments, the maximum field angle FOV of the infrared confocal wide-angle lens satisfies the conditional expression: FOV is more than or equal to 160 degrees and less than or equal to 180 degrees. In order to realize a large field angle, the caliber of the first lens needs to be enlarged generally, and the increase of the caliber will increase the overall quality of the system. Meanwhile, the system has better imaging quality in two wavelength ranges by optimizing the surface type, the structure and the material, so that the requirement of day and night use can be met.
In some embodiments, the effective focal length f of the infrared confocal wide-angle lens and the distance TTL between the object side surface of the first lens and the imaging surface on the optical axis satisfy the following relation: f/TTL is more than 0.2 and less than 0.3. When the lens f is smaller, the space between the lenses in the lens can be controlled, the optical total length of the lens is further adjusted to a proper range, and the miniaturization of the lens is realized.
In some embodiments, the combined focal length f12 of the first and second lenses and the effective focal length f of the infrared confocal wide-angle lens satisfy the relationship: -5 < f12/f < -1. The angle of the light from the object side entering the lens can be improved, so that the field angle of the lens is enlarged, and meanwhile, the incident light is converged and stably enters the lens; the sensitivity of the lens is reduced, and the requirement of miniaturization is met.
In some embodiments, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy the relationship: -0.5 < f1/f2 < 0.1. The reasonable power distribution of the first lens and the second lens can be ensured, which is beneficial to obtaining larger field angle and reducing the excessive increase of system aberration.
In some embodiments, the edge face tilt angle θ of the object side surface of the first lens1The maximum field angle FOV of the infrared confocal wide-angle lens meets the relation: theta is more than 0.041the/FOV is less than 0.10. The infrared confocal lens is beneficial to obtaining balance between the light incidence angle and the surface inclination angle of the first lens so as to effectively adjust the incident light path of each view field, thereby obtaining higher illumination and gentle reduction of the infrared confocal lens.
In some embodiments, the edge face tilt angle θ of the object side face of the sixth lens12The inclination angle theta of the edge surface of the image side surface of the sixth lens13Satisfy the relation: theta is more than 1.012/θ13Is less than 1.5. Can avoid the too big distortion of face type emergence at effective footpath edge, make the angle change of effective footpath department reasonable, also help the change of face type to tend to gently simultaneously, reduce leaking appearing in the marginal visual fieldLight phenomena.
In some embodiments, the separation distance CT45 on the optical axis of the fourth lens and the fifth lens, the separation distance ET45 at the effective diameter edge of the fourth lens and the fifth lens, and the distance TTL on the optical axis from the object side surface to the image plane of the first lens satisfy the following relation: 0.01 < (CT 45+ ET 45)/TTL < 0.03. By arranging so that the centers and edges of the fourth lens and the fifth lens are very close to each other, the effect of the cemented lens can be approximated.
In some embodiments, the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy the relationship: 0.5 < | f4/f5| < 1.5. By restricting the ratio of the effective focal lengths of the fourth lens and the fifth lens, the influence of the two lenses on the field curvature of the system can be reasonably controlled, the light is smoothly transited, and chromatic aberration is corrected.
In some embodiments, SAGs 41, 42 of the object-side surface of the fourth lens, SAGs 51, 52 of the image-side surface of the fifth lens satisfy the relationship: -25 < (SAG 51+ SAG 52)/(SAG 41+ SAG 42) < 5. The effective focal length can be improved on the premise of ensuring the imaging quality of the lens; the spherical aberration of the middle field of view and the coma of the edge field of view are improved, so that the lens has better aberration correction capability; the relative illumination of the system can be increased, and the imaging quality of the lens in a dark environment is improved.
In some embodiments, saga 11 for the object-side surface of the first lens, the effective aperture D11 for the object-side surface of the first lens, satisfy the relationship: 0.05 < SAG11/D11 < 0.20. The field angle of the object side surface of the first lens can be ensured to be larger, so that the fast focusing of peripheral light rays is facilitated, and the imaging quality can be improved.
In some embodiments, the saggital height SAG11 of the object-side surface of the first lens, the thickness CT1 of the first lens on the optical axis, satisfies the relationship: 0.5 < SAG11/CT1 < 1.5. The method avoids the light from turning at a large angle, is beneficial to reducing tolerance sensitivity, reduces processing difficulty, improves production yield and can avoid serious ghost images.
In some embodiments, the optical lens satisfies the conditional expression:
wherein,zindicating the distance of the curved surface from the apex of the curved surface in the direction of the optical axis,cis the curvature of the vertex of the quadric surface,hthe distance from the optical axis to the curved surface is shown,kis the coefficient of the quadratic surface,a 4 、a 6 、a 8 、a 10 、a 12 、a 14 respectively representing the coefficients of the curved surface of fourth order, sixth order, eighth order, tenth order, twelfth order and fourteenth order. The method meets the conditional expression, can control each aspheric surface profile to ensure the balance between each profile and the structure and the balance between the image quality and the structure under the producible condition.
In some embodiments, the first lens and the sixth lens can both adopt aspheric 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.
According to the optical lens of the above embodiment of the application, the shape of the lens is set through optimization, the focal power is distributed reasonably, the lens material is selected reasonably, high resolution can be realized by using six-piece structure, more than eight million pixels can be achieved, and the requirements of miniaturization, low cost, high resolution and the like of the lens can be considered at the same time.
In some embodiments, an optical lens according to the present application may employ a plastic lens or a glass lens. Generally, the thermal expansion coefficient of a lens made of plastic is large, and when the ambient temperature change of the lens is large, the lens made of plastic causes the optical back focus change of the lens to be large. The glass lens can reduce the influence of temperature on the optical back focus of the lens, but has higher cost.
In the following embodiments, the thickness, the curvature radius, and the material selection of each lens in the optical lens are different, and specific differences can be referred to in the parameter tables of the embodiments. The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto. It will be understood by those skilled in the art that the number of lenses making up the lens barrel may be varied to achieve the various results and advantages described in this specification without departing from the claimed subject matter. For example, although six lenses are exemplified in the embodiment, the optical lens is not limited to including six lenses. The optical lens may also include other numbers of lenses, if desired.
First embodiment
Referring to fig. 1, a schematic structural diagram of an infrared confocal wide-angle lens according to an embodiment of the present invention includes, in order from an object side to an image plane along an optical axis: a first lens L1, a second lens L2, a stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an infrared filter G1.
The first lens element L1 is a plastic aspheric lens with negative power, the object-side surface S1 is convex, and the image-side surface S2 is concave;
the second lens element L2 is a plastic aspheric lens with positive refractive power, the object-side surface S3 is concave, and the image-side surface S4 is convex;
the third lens L3 is a plastic aspheric lens with positive focal power, and both the object-side surface S5 and the image-side surface S6 are convex surfaces;
the fourth lens L4 is a plastic aspheric lens with negative power, and the object-side surface S7 and the image-side surface S8 are both concave surfaces;
the fifth lens L5 is a plastic aspheric lens with positive focal power, and the object-side surface S9 and the image-side surface S10 are both convex surfaces;
the sixth lens element L6 is a plastic aspheric lens with negative power, and has a convex object-side surface S11 at paraxial region and a concave image-side surface S12 at paraxial region;
the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all plastic aspheric lenses.
The relevant parameters of each lens in the infrared confocal wide-angle lens provided by the first embodiment of the invention are shown in table 1.
TABLE 1
The surface type coefficients of the aspheric surfaces of the infrared confocal wide-angle lens provided by the first embodiment of the invention are shown in table 2.
TABLE 2
In the present embodiment, referring to fig. 2, fig. 3 and fig. 4, a visible light MTF graph, an infrared light MTF graph and an axial chromatic aberration graph of the infrared confocal wide-angle lens are respectively shown.
The MTF curves of fig. 2 and 3 are for evaluating the performance of the optical system, the horizontal axis represents the distance from the center to the edge of the screen (unit: mm), and the vertical axis represents the OTF coefficient (image optical transmission quality contrast, unit:%). As can be seen from fig. 2, the OTF coefficients of the curves in the visible light band are all above 0.4, and as can be seen from fig. 3, the OTF coefficients of the curves in the infrared light band are all above 0.5, which indicates that the infrared confocal wide-angle lens has good resolution and good imaging performance in the visible light band and the infrared light band.
The axial chromatic aberration curve of fig. 4 represents aberration at the optical axis of the imaging plane, the horizontal axis represents the axial chromatic aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from FIG. 4, the total chromatic aberration is within the range of + -0.02 mm, which indicates that the infrared confocal wide-angle lens has good achromatic performance.
Second embodiment
Referring to fig. 5, a schematic diagram of an infrared confocal wide-angle lens structure according to an embodiment of the present invention is shown, where the structure of the infrared confocal wide-angle lens in the embodiment is substantially the same as that of the infrared confocal wide-angle lens in the first embodiment, and the differences are the thickness of the lens, the distance between the lenses, the radius of curvature of the lens, and the like.
The relevant parameters of each lens in the infrared confocal wide-angle lens provided by the second embodiment of the invention are shown in table 3.
TABLE 3
The surface type coefficients of the aspheric surfaces of the infrared confocal wide-angle lens provided by the second embodiment of the invention are shown in table 4.
TABLE 4
In the present embodiment, referring to fig. 6, fig. 7 and fig. 8, a visible light MTF graph, an infrared light MTF graph and an axial chromatic aberration graph of the infrared confocal wide-angle lens are respectively shown.
The MTF curves of fig. 6 and 7 are for evaluating the performance of the optical system, and the horizontal axis represents the distance from the center to the edge of the screen (unit: mm) and the vertical axis represents the OTF coefficient (image optical transmission quality contrast, unit:%). As can be seen from fig. 6, the OTF coefficients of the curves in the visible light band are all above 0.5, and as can be seen from fig. 7, the OTF coefficients of the curves in the infrared light band are all above 0, which indicates that the infrared confocal wide-angle lens has good resolution and good imaging performance in the visible light band.
The axial chromatic aberration curve of fig. 8 represents aberration at the optical axis of the imaging plane, the horizontal axis represents the axial chromatic aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from FIG. 8, the total chromatic aberration is within the range of + -0.04 mm, which indicates that the infrared confocal wide-angle lens has good achromatic performance.
Third embodiment
Referring to fig. 9, a schematic structural diagram of an infrared confocal wide-angle lens according to an embodiment of the present invention includes, in order from an object side to an image plane along an optical axis: a first lens L1, a second lens L2, a stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and an infrared filter G1.
The first lens element L1 is a plastic aspheric lens with negative power, the object-side surface S1 is convex, and the image-side surface S2 is concave;
the second lens element L2 is a plastic aspheric lens with negative power, the object-side surface S3 is concave, and the image-side surface S4 is convex;
the third lens L3 is a plastic aspheric lens with positive focal power, and both the object-side surface S5 and the image-side surface S6 are convex surfaces;
the fourth lens L4 is a plastic aspheric lens with negative power, and the object-side surface S7 and the image-side surface S8 are both concave surfaces;
the fifth lens L5 is a plastic aspheric lens with positive focal power, and the object-side surface S9 and the image-side surface S10 are both convex surfaces;
the sixth lens element L6 is a plastic aspheric lens with negative power, and has a convex object-side surface S11 at paraxial region and a concave image-side surface S12 at paraxial region;
the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all plastic aspheric lenses.
The third embodiment of the present invention provides the lens of infrared confocal wide-angle lens with the relevant parameters shown in table 5.
TABLE 5
The surface type coefficients of the aspheric surfaces of the infrared confocal wide-angle lens provided by the third embodiment of the present invention are shown in table 6.
TABLE 6
In the present embodiment, referring to fig. 10, fig. 11, and fig. 12, a visible light MTF graph, an infrared light MTF graph, and an axial chromatic aberration graph of the infrared confocal wide-angle lens are respectively shown.
The MTF curves of fig. 10 and 11 are for evaluating the performance of the optical system, and the horizontal axis represents the distance from the center to the edge of the screen (unit: mm) and the vertical axis represents the OTF coefficient (image optical transmission quality contrast, unit:%). As can be seen from fig. 10, the OTF coefficients of the curves in the visible light band are all above 0.6, and as can be seen from fig. 11, the OTF coefficients of the curves in the infrared light band are all above 0.5, which indicates that the infrared confocal wide-angle lens has good resolution and good imaging performance in the visible light band and the infrared light band.
The axial chromatic aberration curve of fig. 12 represents aberration at the optical axis of the imaging plane, the horizontal axis represents the axial chromatic aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from FIG. 12, the total chromatic aberration is within the range of + -0.04 mm, which indicates that the infrared confocal wide-angle lens has good achromatic performance.
Table 7 shows the three embodiments and their corresponding optical characteristics, which mainly include the effective focal length f of the infrared confocal wide-angle lens, the f-number FNO, the maximum field angle FOV of the infrared confocal wide-angle lens, the distance TTL from the object-side surface of the first lens to the image plane on the optical axis, and the values corresponding to each conditional expression in the foregoing.
TABLE 7
In summary, the infrared confocal wide-angle lens provided by the embodiment of the invention has at least the following advantages:
1. the infrared confocal wide-angle lens provided by the embodiment of the invention adopts the all-plastic lens, and the plastic lens has the advantages of low cost and low manufacturing process difficulty compared with a glass lens, and is suitable for mass production.
2. The maximum value of the field angle of the infrared confocal wide-angle lens provided by the embodiment of the invention is 180 degrees, the infrared confocal wide-angle lens is used for providing a larger monitoring range for a vehicle-mounted lens, and by optimizing the structural parameters and materials of the lens, the small aberration under the condition of a large field is realized, the image processing process of a chip at the later stage is facilitated to be simplified, and the complexity of a program algorithm is reduced.
3. The infrared confocal wide-angle lens provided by the embodiment of the invention well eliminates chromatic aberration, has excellent imaging capability in two ranges of a visible light band and an infrared band, and can realize day and night dual-purpose.
In summary, the infrared confocal wide-angle lens provided by the embodiment of the invention adopts six plastic lenses, and by reasonably distributing the focal power, the surface shape, the central thickness of each lens, the on-axis distance between each lens and the like, the lens has the beneficial effects of miniaturization, light weight, good thermal stability, good processability and the like while realizing good imaging quality.
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 (10)
1. An infrared confocal wide-angle lens comprising, in order from an object side to an imaging plane 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 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 diaphragm;
a third lens having a positive refractive power, both the object-side surface and the image-side surface of the third lens being convex;
a fourth lens element having a negative optical power, wherein both the object-side surface and the image-side surface of the fourth lens element are concave;
a fifth lens element having a positive refractive power, the object-side surface and the image-side surface of the fifth lens element being convex;
and a sixth lens element having a negative power, an object-side surface being convex at a paraxial region and an image-side surface being concave at the paraxial region;
the infrared confocal wide-angle lens meets the conditional expression: FOV is more than or equal to 160 degrees and less than or equal to 180 degrees, f/TTL is more than 0.2 and less than 0.3, wherein: the FOV represents the maximum field angle of the infrared confocal wide-angle lens, f represents the effective focal length of the infrared confocal wide-angle lens, and TTL represents the distance from the object side surface of the first lens to the imaging surface on the optical axis.
2. The infrared confocal wide-angle lens of claim 1, wherein a combined focal length f12 of the first and second lenses and an effective focal length f of the infrared confocal wide-angle lens satisfy the relationship: -5 < f12/f < -1.
3. The infrared confocal wide-angle lens of claim 1, wherein the focal length f1 of the first lens and the focal length f2 of the second lens satisfy the relation: -0.5 < f1/f2 < 0.1.
4. The infrared confocal wide-angle lens of claim 1, wherein the first lens has an edge face tilt angle θ of the object-side face1And the maximum field angle FOV of the infrared confocal wide-angle lens satisfies the relational expression: theta is more than 0.041/FOV＜0.10。
5. The infrared confocal wide-angle lens of claim 1, wherein the sixth lens has an object-side edge surface tilt angle θ12The inclination angle theta of the edge surface of the image side surface of the sixth lens is13Satisfy the relation: theta is more than 1.012/θ13＜1.5。
6. The infrared confocal wide-angle lens of claim 1, wherein an on-axis separation distance CT45 between the fourth lens and the fifth lens, an on-axis separation distance ET45 between the fourth lens and the fifth lens at an effective diameter edge, and an on-axis distance TTL between an object side surface and an image plane of the first lens satisfy the following relations: 0.01 < (CT 45+ ET 45)/TTL < 0.03.
7. The infrared confocal wide-angle lens of claim 1, wherein the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy the relation: 0.5 < | f4/f5| < 1.5.
8. The infrared confocal wide-angle lens of claim 1, wherein the sago 41 of the object-side surface of the fourth lens, the sago 42 of the image-side surface of the fourth lens, the sago 51 of the object-side surface of the fifth lens, and the sago 52 of the image-side surface of the fifth lens satisfy the relationships: -25 < (SAG 51+ SAG 52)/(SAG 41+ SAG 42) < 5.
9. The infrared confocal wide-angle lens of claim 1, wherein saga 11 of the object-side surface of the first lens and the effective aperture D11 of the object-side surface of the first lens satisfy the relation: 0.05 < SAG11/D11 < 0.20.
10. The infrared confocal wide-angle lens of claim 1, wherein saga 11 of the object-side surface of the first lens, the thickness CT1 of the first lens on the optical axis satisfy the relation: 0.5 < SAG11/CT1 < 1.5.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113791489A (en) * | 2021-11-16 | 2021-12-14 | 江西联益光学有限公司 | Optical lens |
| CN113985585A (en) * | 2021-12-24 | 2022-01-28 | 江西联创电子有限公司 | Infrared confocal lens |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101833163A (en) * | 2010-05-20 | 2010-09-15 | 福州福赛特光学仪器有限公司 | High definition broad spectrum co-focal plane video camera |
| EP2908164A1 (en) * | 2012-10-31 | 2015-08-19 | Han's Laser Technology Industry Group Co., Ltd. | Near-infrared laser focusing lens and laser printing device |
| CN205003346U (en) * | 2015-10-14 | 2016-01-27 | 浙江舜宇光学有限公司 | Ultra wide -angle lens |
| CN205049802U (en) * | 2015-10-20 | 2016-02-24 | 浙江舜宇光学有限公司 | Ultra wide -angle lens |
| CN106814439A (en) * | 2015-12-01 | 2017-06-09 | 先进光电科技股份有限公司 | Optical imaging system |
| JP6194134B1 (en) * | 2017-05-11 | 2017-09-06 | エーエーシーアコースティックテクノロジーズ（シンセン）カンパニーリミテッドＡＡＣ Ａｃｏｕｓｔｉｃ Ｔｅｃｈｎｏｌｏｇｉｅｓ（Ｓｈｅｎｚｈｅｎ）Ｃｏ．，Ｌｔｄ | Imaging lens |
| JP6197141B1 (en) * | 2017-06-26 | 2017-09-13 | エーエーシーアコースティックテクノロジーズ（シンセン）カンパニーリミテッドＡＡＣ Ａｃｏｕｓｔｉｃ Ｔｅｃｈｎｏｌｏｇｉｅｓ（Ｓｈｅｎｚｈｅｎ）Ｃｏ．，Ｌｔｄ | Imaging lens |
| TW201819979A (en) * | 2016-11-21 | 2018-06-01 | 新鉅科技股份有限公司 | Six-piece optical lens system with a wide field of view |
| US20180196239A1 (en) * | 2017-01-06 | 2018-07-12 | Ability Opto-Electronics Technology Co., Ltd. | Optical image capturing system |
| CN108614346A (en) * | 2016-12-13 | 2018-10-02 | 新巨科技股份有限公司 | Six chip broad angle lens groups |
| CN211741696U (en) * | 2020-03-13 | 2020-10-23 | 南昌欧菲精密光学制品有限公司 | Optical imaging system, imaging module and electronic device |
| CN212808764U (en) * | 2020-06-12 | 2021-03-26 | 协益电子（苏州）有限公司 | Wide-angle lens |
| CN112630947A (en) * | 2021-03-11 | 2021-04-09 | 江西晶超光学有限公司 | Zoom optical system, camera module and terminal equipment |
-
2021
- 2021-09-03 CN CN202111029247.2A patent/CN113467059B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101833163A (en) * | 2010-05-20 | 2010-09-15 | 福州福赛特光学仪器有限公司 | High definition broad spectrum co-focal plane video camera |
| EP2908164A1 (en) * | 2012-10-31 | 2015-08-19 | Han's Laser Technology Industry Group Co., Ltd. | Near-infrared laser focusing lens and laser printing device |
| CN205003346U (en) * | 2015-10-14 | 2016-01-27 | 浙江舜宇光学有限公司 | Ultra wide -angle lens |
| CN205049802U (en) * | 2015-10-20 | 2016-02-24 | 浙江舜宇光学有限公司 | Ultra wide -angle lens |
| CN106814439A (en) * | 2015-12-01 | 2017-06-09 | 先进光电科技股份有限公司 | Optical imaging system |
| TW201819979A (en) * | 2016-11-21 | 2018-06-01 | 新鉅科技股份有限公司 | Six-piece optical lens system with a wide field of view |
| CN108614346A (en) * | 2016-12-13 | 2018-10-02 | 新巨科技股份有限公司 | Six chip broad angle lens groups |
| US20180196239A1 (en) * | 2017-01-06 | 2018-07-12 | Ability Opto-Electronics Technology Co., Ltd. | Optical image capturing system |
| JP6194134B1 (en) * | 2017-05-11 | 2017-09-06 | エーエーシーアコースティックテクノロジーズ（シンセン）カンパニーリミテッドＡＡＣ Ａｃｏｕｓｔｉｃ Ｔｅｃｈｎｏｌｏｇｉｅｓ（Ｓｈｅｎｚｈｅｎ）Ｃｏ．，Ｌｔｄ | Imaging lens |
| JP6197141B1 (en) * | 2017-06-26 | 2017-09-13 | エーエーシーアコースティックテクノロジーズ（シンセン）カンパニーリミテッドＡＡＣ Ａｃｏｕｓｔｉｃ Ｔｅｃｈｎｏｌｏｇｉｅｓ（Ｓｈｅｎｚｈｅｎ）Ｃｏ．，Ｌｔｄ | Imaging lens |
| CN211741696U (en) * | 2020-03-13 | 2020-10-23 | 南昌欧菲精密光学制品有限公司 | Optical imaging system, imaging module and electronic device |
| CN212808764U (en) * | 2020-06-12 | 2021-03-26 | 协益电子（苏州）有限公司 | Wide-angle lens |
| CN112630947A (en) * | 2021-03-11 | 2021-04-09 | 江西晶超光学有限公司 | Zoom optical system, camera module and terminal equipment |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113791489A (en) * | 2021-11-16 | 2021-12-14 | 江西联益光学有限公司 | Optical lens |
| CN113985585A (en) * | 2021-12-24 | 2022-01-28 | 江西联创电子有限公司 | Infrared confocal lens |
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