CN220509201U - Optical lens - Google Patents
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- CN220509201U CN220509201U CN202321389264.1U CN202321389264U CN220509201U CN 220509201 U CN220509201 U CN 220509201U CN 202321389264 U CN202321389264 U CN 202321389264U CN 220509201 U CN220509201 U CN 220509201U
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- 230000003287 optical effect Effects 0.000 title claims abstract description 125
- 239000011521 glass Substances 0.000 claims abstract description 9
- 238000003384 imaging method Methods 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 8
- 230000009286 beneficial effect Effects 0.000 description 16
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- 230000035945 sensitivity Effects 0.000 description 4
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Abstract
The utility model discloses an optical lens, which comprises a first lens, a second lens, a third positive lens, a fourth positive lens, a fifth lens, a sixth lens, a seventh lens, an IR filter and an image plane IMA, wherein the first lens, the second lens, the third positive lens, the fourth positive lens, the fifth lens, the sixth lens, the seventh lens, the IR filter and the image plane IMA are sequentially arranged along the optical axis from left to right in the incident direction; 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 is concave, and the image side surface is convex; the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens element has negative refractive power, wherein an object-side surface of the sixth lens element is concave, and an image-side surface of the sixth lens element is convex; the seventh lens has positive focal power, the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a concave surface. In the utility model, 7 glass spherical lenses are adopted, so that the processing property is good, the cost is low, the high resolution can be realized, meanwhile, the large aperture is 1.4, the light inlet quantity of the lens is increased, the observation of the surrounding situation in a dark environment is facilitated, and the utility model is suitable for the fields of automobile side view systems and automatic driving.
Description
Technical Field
The utility model belongs to the technical field of optical imaging, and particularly relates to an optical lens.
Background
In recent years, with the development of vehicle-mounted technology, there are increasing technical demands on vehicle-mounted cameras such as side view cameras, auto cruisers, and automobile recorders. The side-view vehicle-mounted lens is an important component part in the advanced driver auxiliary system, and a driver can find an obstacle on the side of the vehicle through the side-view vehicle-mounted lens so as to avoid driving accidents.
However, in order to improve the resolution, the conventional side view imaging lens generally uses an aspherical molded glass lens, which is costly and difficult to manufacture, and the aperture of the lens is generally between 1.6 and 2.0.
Disclosure of Invention
In order to solve the technical problems in the prior art, the utility model aims to provide an optical lens.
In order to achieve the above purpose and achieve the above technical effects, the utility model adopts the following technical scheme:
an optical lens comprises a first lens, a second lens, a third positive lens, a fourth positive lens, a fifth lens, a sixth lens, a seventh lens, an IR filter and an image plane IMA which are sequentially arranged along an optical axis from left to right in an incident direction;
the first lens has negative focal power, the object side surface of the first lens is a convex surface, the image side surface of the first lens is a concave surface, and the first lens is a meniscus shape, so that the collection of light rays is facilitated, and distortion is reduced;
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 convex surface, so that the second lens is favorable for receiving the converted light more smoothly, reducing aberration and reducing the sensitivity of the lens, and is also favorable for reducing the caliber of the lens;
the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;
the sixth lens is provided with negative focal power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface;
the seventh lens has positive focal power, the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a concave surface.
Further, the following conditions are satisfied between the maximum field angle FOV of the optical lens, the maximum aperture D of the object side surface of the first lens corresponding to the maximum field angle, the image height h corresponding to the maximum field angle, the distance BFL from the center of the image side surface of the last lens of the optical lens to the imaging surface of the optical lens on the optical axis, the distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, and the focal length f of the whole group of optical lenses:
84<(BFL/TTL)×(FOV/h/D)×(FOV×f)/h×(TTL/f)<2100。
further, the optical lens satisfies the following conditions: BFL is the distance between the center of the image side surface of the last lens of the optical lens and the imaging surface of the optical lens on the optical axis, and TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis.
Furthermore, BFL/TTL is more than 0.15, which is beneficial to increasing the optical back focus of the lens and reserving sufficient space for the module.
Further, the optical lens satisfies the following conditions: 1.8 is less than or equal to FOV/h/D is less than or equal to 2.1, wherein FOV is the maximum field angle of the optical lens, D is the maximum aperture of the object side surface of the first lens corresponding to the maximum field angle of the optical lens, and h is the image height corresponding to the maximum field angle of the optical lens.
Further, the optical lens satisfies the following conditions: and (FOV x f)/h is not more than 60 and not more than 70, wherein FOV is the maximum field angle of the optical lens, f is the whole set of focal length values of the optical lens, h is the image height corresponding to the maximum field angle, and the three indexes are controlled, so that the lens distortion is reduced.
Further, the optical lens satisfies the following conditions: and TTL/f is more than or equal to 6 and less than or equal to 7, wherein TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis, and f is the whole set of focal length values of the optical lens.
Furthermore, TTL/f is less than or equal to 6.5, which is more beneficial to miniaturization of the lens.
Further, the optical lens satisfies the following conditions: -2.ltoreq.f1/f.ltoreq.1, 2.ltoreq.f3/f.ltoreq.3, 1.ltoreq.f5/f.ltoreq.2, -2.5.ltoreq.f6/f.ltoreq.1.5, wherein f is the focal length value of the whole set of optical lenses, and f1, f3, f5, f6 are the focal lengths of the first lens, the third positive lens, the fifth lens and the sixth lens in order.
Furthermore, a diaphragm is arranged between the third positive lens and the fourth positive lens, which is beneficial to reducing the caliber of the lens.
Further, the fifth lens satisfies Nd5 < 1.6 and Vd5 > 60, wherein Nd5 is the refractive index of the fifth lens, and Vd5 is the Abbe number of the fifth lens.
Further, the fifth lens is a refractive index temperature coefficient of < -9×10% -6 And (3) the glass material with the temperature of/DEG C counteracts the influence of deflection of a high-temperature focal plane to an object plane caused by the temperature coefficient of the positive dn/dt refractive index of the high-refractive high-Abbe material.
Further, the fifth lens and the sixth lens are cemented lenses or split lenses.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model discloses an optical lens, which adopts 7 glass spherical lenses, has good processability and low cost, can realize high resolution and simultaneously give consideration to 1.4 of large aperture, increases the light incoming quantity of the lens, is beneficial to observing surrounding conditions in dark environment, is suitable for the fields of automobile side view systems and automatic driving, and solves the problems of high cost and complex processing of using glass aspheric surfaces in the prior art.
Drawings
FIG. 1 is a schematic structural diagram of embodiment 1 of the present utility model;
FIG. 2 is a graph of curvature of field and distortion for example 1 of the present utility model;
FIG. 3 is a schematic structural diagram of embodiment 2 of the present utility model;
fig. 4 is a graph showing curvature of field and distortion in example 2 of the present utility model.
Detailed Description
The present utility model is described in detail below so that advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making clear and unambiguous the scope of the present utility model.
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
As shown in fig. 1 to 4, an optical lens includes a first lens 1, a second lens 2, a third positive lens 3, a fourth positive lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an IR filter 8, and an image plane IMA9, which are disposed in this order along an optical axis from left to right;
the first lens element 1 has a negative focal power, a convex object-side surface and a concave image-side surface, and is meniscus-shaped, which is beneficial to collecting light and reducing distortion;
the second lens 2 has negative focal power, the object side surface is a concave surface, and the image side surface is a convex surface, so that the lens is favorable for receiving the folded light more smoothly, reducing aberration, reducing sensitivity of the lens and reducing aperture of the lens;
a diaphragm 10 is arranged between the third positive lens 3 and the fourth positive lens 4, which is beneficial to reducing the aperture of the lens;
the fifth lens element 5 has positive refractive power, wherein an object-side surface thereof is convex, and an image-side surface thereof is convex; the fifth lens 5 satisfies Nd5 < 1.6, vd5 > 60, wherein Nd5 is the refractive index of the fifth lens 5, vd5 is the Abbe number of the fifth lens 5; the fifth lens 5 has refractive index temperature coefficient less than-9×10 -6 Glass material at a temperature of/DEG C, counteracts the positive dn of high-refractive high-Abbe materialHigh temperature focal plane deflection object plane influence caused by the dt refractive index temperature coefficient;
the sixth lens element 6 with negative refractive power has a concave object-side surface and a convex image-side surface;
the fifth lens 5 and the sixth lens 6 are cemented lenses or split lenses;
the seventh lens element 7 has positive refractive power, and has a convex object-side surface and a concave image-side surface.
The maximum field angle FOV of the optical lens, the maximum light passing caliber D of the object side surface of the first lens corresponding to the maximum field angle, the image height h corresponding to the maximum field angle, the distance BFL from the center of the image side surface of the last lens of the optical lens to the imaging surface of the optical lens on the optical axis, the distance TTL from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis and the whole group of focal length values f of the optical lens meet the following conditions:
84<(BFL/TTL)×(FOV/h/D)×(FOV×f)/h×(TTL/f)<2100；
BFL/TTL is more than or equal to 0.13 and less than or equal to 2, and when BFL/TTL is more than 0.15, the optical back focus of the lens is increased, and sufficient space is reserved for the module;
the FOV/h/D is more than or equal to 1.8 and less than or equal to 2.1, which is beneficial to realizing small caliber of the front-end lens;
the FOV multiplied by f/h is more than or equal to 60 and less than or equal to 70, and the three indexes are controlled, so that the lens distortion is reduced;
TTL/f is less than or equal to 6 and less than or equal to 7, and when TTL/f is less than or equal to 6.5, the lens is more beneficial to miniaturization.
The optical lens of the utility model satisfies the following conditions: -2 is less than or equal to 1/f is less than or equal to-1, 2 is less than or equal to f3/f is less than or equal to 3,1 is less than or equal to f5/f is less than or equal to 2, -2.5 is less than or equal to f6/f is less than or equal to-1.5, wherein f is the focal length value of the whole group of the optical lens, and f1, f3, f5 and f6 are the focal lengths of the first lens, the third positive lens, the fifth lens and the sixth lens in sequence.
The third positive lens 3, the fourth positive lens 4 and the fifth lens 5 are all positive lenses, which is beneficial to the light ray conversion and the lens length reduction.
In the optical lens, at least one group of the cemented lens is arranged, so that chromatic aberration is reduced or eliminated, imaging quality is improved, the lens transmittance is improved, and assembly difficulty is reduced.
Example 1
As shown in fig. 1-2, an optical lens includes a first lens 1, a second lens 2, a third positive lens 3, a fourth positive lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an IR filter 8, and an image plane IMA9, which are disposed in order along an optical axis from left to right;
the first lens element 1 has a negative focal power, a convex object-side surface and a concave image-side surface, and is meniscus-shaped, which is beneficial to collecting light and reducing distortion;
the second lens 2 has negative focal power, the object side surface is a concave surface, and the image side surface is a convex surface, so that the lens is favorable for receiving the folded light more smoothly, reducing aberration, reducing sensitivity of the lens and reducing aperture of the lens;
a diaphragm 10 is arranged between the third positive lens 3 and the fourth positive lens 4, which is beneficial to reducing the aperture of the lens;
the fifth lens element 5 has positive refractive power, wherein an object-side surface thereof is convex, and an image-side surface thereof is convex; the fifth lens 5 has refractive index temperature coefficient less than-9×10 -6 Glass material at the temperature of/DEG C, offset the influence of deflection of a high-temperature focal plane to an object plane caused by a positive dn/dt refractive index temperature coefficient of a high-refractive high-Abbe material;
the sixth lens element 6 with negative refractive power has a concave object-side surface and a convex image-side surface;
the fifth lens 5 and the sixth lens 6 are cemented lenses, so that chromatic aberration is reduced or eliminated, imaging quality is improved, the lens transmittance is improved, and assembly difficulty is reduced;
the seventh lens element 7 has positive refractive power, and has a convex object-side surface and a concave image-side surface.
The maximum field angle FOV of the optical lens in this embodiment, the maximum aperture D of the object side surface of the first lens element corresponding to the maximum field angle, the image height h corresponding to the maximum field angle, the distance BFL between the center of the image side surface of the last lens element of the optical lens element and the imaging surface of the optical lens element on the optical axis, the distance TTL between the center of the object side surface of the first lens element and the imaging surface of the optical lens element on the optical axis, and the total set of focal length values f of the optical lens elements are shown in table 1.
TABLE 1
| Example 1 | |
| f | 3.54 |
| BFL | 3.38 |
| TTL | 24.51 |
| FOV | 117.4 |
| h | 6.416 |
| D | 9.2 |
| ENPD | 2.528 |
In table 1, ENPD is the effective aperture diameter of the optical lens.
The aperture=f/enpd=1.4 of the optical lens of embodiment 1.
The optical lens of the present embodiment satisfies the following conditions: -2 is less than or equal to 1/f is less than or equal to-1, 2 is less than or equal to f3/f is less than or equal to 3,1 is less than or equal to f5/f is less than or equal to 2, -2.5 is less than or equal to f6/f is less than or equal to-1.5, wherein f is the focal length value of the whole group of the optical lens, and f1, f3, f5 and f6 are the focal lengths of the first lens, the third positive lens, the fifth lens and the sixth lens in sequence.
The third positive lens 3, the fourth positive lens 4 and the fifth lens 5 are all positive lenses, which is beneficial to the light ray conversion and the lens length reduction.
The optical parameters of each lens in the optical lens of this embodiment are shown in table 2.
TABLE 2
Table 1 shows the basic parameters of the optical lens of example 1, wherein the radii of curvature of the diaphragm 10, the IR filter 8 and the image plane IMA9 are infinite, indicating that this surface is planar, and the R value and the center thickness or spacing are each in millimeters (mm).
Fig. 2 is a field curvature and distortion diagram of the optical lens of the present embodiment. Wherein, the left graph is a field curvature graph, the ordinate of the field curvature graph is the field angle, the abscissa is the distance of an image point from a paraxial image plane, T represents meridian field curvature, S represents sagittal field curvature, and the field curvature graph displays the current focal plane or the distance from the image plane to the paraxial focal plane as a function of the field coordinate and is divided into meridian field curvature and sagittal field curvature; the right graph is a distortion graph, the ordinate of the distortion graph is the field angle, the abscissa is the distortion percentage, the distortion belongs to the aberration of the chief ray, and reflects the similarity of the object image, and the optical lens in the embodiment 1 has smaller optical field curvature, smaller distortion and clear image.
Example 2
As shown in fig. 3 to 4, an optical lens includes a first lens 1, a second lens 2, a third positive lens 3, a fourth positive lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an IR filter 8, and an image plane IMA9, which are disposed in this order along an optical axis from left to right;
the first lens element 1 has a negative focal power, a convex object-side surface and a concave image-side surface, and is meniscus-shaped, which is beneficial to collecting light and reducing distortion;
the second lens 2 has negative focal power, the object side surface is a concave surface, and the image side surface is a convex surface, so that the lens is favorable for receiving the folded light more smoothly, reducing aberration, reducing sensitivity of the lens and reducing aperture of the lens;
a diaphragm 10 is arranged between the third positive lens 3 and the fourth positive lens 4, which is beneficial to reducing the aperture of the lens;
the fifth lens element 5 has positive refractive power, wherein an object-side surface thereof is convex, and an image-side surface thereof is convex; the fifth lens 5 has refractive index temperature coefficient less than-9×10 -6 Glass material at the temperature of/DEG C, offset the influence of deflection of a high-temperature focal plane to an object plane caused by a positive dn/dt refractive index temperature coefficient of a high-refractive high-Abbe material;
the sixth lens element 6 with negative refractive power has a concave object-side surface and a convex image-side surface;
the fifth lens 5 and the sixth lens 6 are cemented lenses, so that chromatic aberration is reduced or eliminated, imaging quality is improved, the lens transmittance is improved, and assembly difficulty is reduced;
the seventh lens element 7 has positive refractive power, and has a convex object-side surface and a concave image-side surface.
The maximum field angle FOV of the optical lens in this embodiment, the maximum aperture D of the object side surface of the first lens element corresponding to the maximum field angle, the image height h corresponding to the maximum field angle, the distance BFL between the center of the image side surface of the last lens element of the optical lens element and the imaging surface of the optical lens element on the optical axis, the distance TTL between the center of the object side surface of the first lens element and the imaging surface of the optical lens element on the optical axis, and the total focal length f of the optical lens element are shown in table 3.
TABLE 3 Table 3
| Example 2 | |
| f | 3.54 |
| BFL | 3.22 |
| TTL | 24.53 |
| FOV | 117.4 |
| h | 6.338 |
| D | 9.4 |
| ENPD | 2.528 |
In table 3, ENPD is the effective aperture diameter of the optical lens.
The aperture=f/enpd=1.4 of the optical lens of embodiment 2.
The optical lens of the present embodiment satisfies the following conditions: -2 is less than or equal to 1/f is less than or equal to-1, 2 is less than or equal to f3/f is less than or equal to 3,1 is less than or equal to f5/f is less than or equal to 2, -2.5 is less than or equal to f6/f is less than or equal to-1.5, wherein f is the focal length value of the whole group of the optical lens, and f1, f3, f5 and f6 are the focal lengths of the first lens, the third positive lens, the fifth lens and the sixth lens in sequence.
The third positive lens 3, the fourth positive lens 4 and the fifth lens 5 are all positive lenses, which is beneficial to the light ray conversion and the lens length reduction.
The optical parameters of each lens in the optical lens of this embodiment are shown in table 4.
TABLE 4 Table 4
Fig. 4 is a graph of curvature of field and distortion of the optical lens of the present embodiment. Wherein, the left graph is a field curvature graph, the ordinate of the field curvature graph is the field angle, the abscissa is the distance of an image point from a paraxial image plane, T represents meridian field curvature, S represents sagittal field curvature, and the field curvature graph displays the current focal plane or the distance from the image plane to the paraxial focal plane as a function of the field coordinate and is divided into meridian field curvature and sagittal field curvature; the right graph is a distortion graph, the ordinate of the distortion graph is the field angle, the abscissa is the distortion percentage, the distortion belongs to the aberration of the chief ray, and reflects the similarity of the object image, and the optical lens in the embodiment 2 has smaller optical field curvature, smaller distortion and clear image.
Example 1 was followed.
Parts or structures of the present utility model, which are not specifically described, may be existing technologies or existing products, and are not described herein.
The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related arts are included in the scope of the present utility model.
Claims (10)
1. An optical lens is characterized by comprising a first lens, a second lens, a third positive lens, a fourth positive lens, a fifth lens, a sixth lens, a seventh lens, an IR filter and an image plane IMA which are sequentially arranged along an optical axis from left to right in an incident direction;
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 concave, and the image side surface of the second lens is convex;
the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;
the sixth lens is provided with negative focal power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface;
the seventh lens has positive focal power, the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a concave surface;
the aperture=f/enpd=1.4 of the optical lens, wherein ENPD is the effective caliber diameter of the optical lens, and f is the whole set of focal length values of the optical lens.
2. The optical lens as claimed in claim 1, wherein the following conditions are satisfied between a maximum field angle FOV of the optical lens, a maximum aperture D of an object side surface of the first lens corresponding to the maximum field angle, an image height h corresponding to the maximum field angle, a distance BFL from a center of an image side surface of a last lens of the optical lens to an imaging surface of the optical lens on the optical axis, a distance TTL from a center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, and a focal length f of the entire group of the optical lens:
84<(BFL/TTL)×(FOV/h/D)×(FOV×f)/h×(TTL/f)<2100。
3. an optical lens according to claim 1, wherein the optical lens satisfies the following condition: BFL is the distance between the center of the image side surface of the last lens of the optical lens and the imaging surface of the optical lens on the optical axis, and TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis.
4. An optical lens according to claim 1, wherein the optical lens satisfies the following condition: 1.8 is less than or equal to FOV/h/D is less than or equal to 2.1, wherein FOV is the maximum field angle of the optical lens, D is the maximum aperture of the object side surface of the first lens corresponding to the maximum field angle of the optical lens, and h is the image height corresponding to the maximum field angle of the optical lens.
5. An optical lens according to claim 1, wherein the optical lens satisfies the following condition: and (FOV x f)/h is more than or equal to 60 and less than or equal to 70, wherein FOV is the maximum field angle of the optical lens, and h is the image height corresponding to the maximum field angle.
6. An optical lens according to claim 1, wherein the optical lens satisfies the following condition: and TTL/f is more than or equal to 6 and less than or equal to 7, wherein TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis, and f is the whole set of focal length values of the optical lens.
7. An optical lens according to claim 1, wherein the optical lens satisfies the following condition: -2.ltoreq.f1/f.ltoreq.1, 2.ltoreq.f3/f.ltoreq.3, 1.ltoreq.f5/f.ltoreq.2, -2.5.ltoreq.f6/f.ltoreq.1.5, wherein f is the focal length value of the whole set of optical lenses, and f1, f3, f5, f6 are the focal lengths of the first lens, the third positive lens, the fifth lens, and the sixth lens in order.
8. An optical lens as claimed in claim 1, wherein a diaphragm is arranged between the third positive lens and the fourth positive lens.
9. The optical lens as claimed in claim 1, wherein the fifth lens satisfies Nd5 < 1.6, vd5 > 60, wherein Nd5 is a refractive index of the fifth lens, and Vd5 is an abbe number of the fifth lens; the fifth lens adopts refractive indexThe temperature coefficient is < -9×10% -6 Glass material at/deg.c.
10. The optical lens as claimed in claim 1, wherein the fifth lens and the sixth lens are cemented lenses or split lenses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321389264.1U CN220509201U (en) | 2023-06-02 | 2023-06-02 | Optical lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321389264.1U CN220509201U (en) | 2023-06-02 | 2023-06-02 | Optical lens |
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|---|---|
| CN220509201U true CN220509201U (en) | 2024-02-20 |
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| CN202321389264.1U Active CN220509201U (en) | 2023-06-02 | 2023-06-02 | Optical lens |
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- 2023-06-02 CN CN202321389264.1U patent/CN220509201U/en active Active
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