CN217879795U - Infrared optical lens - Google Patents
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- CN217879795U CN217879795U CN202222053259.5U CN202222053259U CN217879795U CN 217879795 U CN217879795 U CN 217879795U CN 202222053259 U CN202222053259 U CN 202222053259U CN 217879795 U CN217879795 U CN 217879795U
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Abstract
The utility model discloses an infrared optical lens, which comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are arranged in sequence from an object plane to an image plane along an optical axis; the first lens and the third lens are negative focal power lenses, the second lens, the fourth lens and the fifth lens are positive focal power lenses, and the focal power of the third lens is
Focal power of fifth lens
And focal power of infrared optical lens
Satisfy the requirement of
The embodiment of the utility model provides an infrared optical lens, through the quantity and the focal power combination of lens in the reasonable infrared optical lens that sets up to and the focal power numerical value of reasonable third lens of setting up and fifth lens, guarantee to realize a miniaturization, the on-vehicle infrared optical imaging lens of the big, higher image quality of luminous flux.
Description
Technical Field
The embodiment of the utility model provides an relate to optical device technical field, especially relate to an infrared optical lens.
Background
With the development of technologies in the automobile industry, the vehicle-mounted lens is widely applied to the head, the tail, two sides and the interior of the automobile, and is also increasingly important for driving safety. The optical lens applied to the driver driving early warning at present requires more miniaturization, has large light flux and high resolution, and the existing lens has the defects of large quantity of lenses, volume limitation, lower resolving power, poor application effect, high cost and the like, and needs further technical iteration.
SUMMERY OF THE UTILITY MODEL
The utility model provides an infrared optical lens to solve the demand of on-vehicle camera lens.
The embodiment of the utility model provides an infrared optical lens, including first lens, second lens, third lens, fourth lens and the fifth lens of arranging in proper order along the optical axis from object plane to image plane;
the first lens and the third lens are negative focal power lenses, and the second lens, the fourth lens and the fifth lens are positive focal power lenses;
the focal power of the third lens is
The focal power of the fifth lens is
The focal power of the infrared optical lens is
Wherein the content of the first and second substances,
optionally, the first lens power is
The second lens has an optical power of
The focal power of the fourth lens is
Optionally, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all glass spherical lenses.
Optionally, the refractive index of the second lens is n2, the refractive index of the third lens is n3, the refractive index of the fourth lens is n4, and the refractive index of the fifth lens is n5;
wherein 1.85-n 2-n 3-n 1.71, 1.85-n 4-n 2.05, 1.71-n 5-n 1.91.
Optionally, the focal length of the infrared optical lens is f, and the optical back focus of the infrared optical lens is BFL;
wherein BFL/f is more than or equal to 0 and less than or equal to 2.
Optionally, a clear aperture of the infrared optical lens is F #, and a total length of the infrared optical lens is TTL;
wherein: f #/TTL is not less than 0.1 and not more than 0.4.
Optionally, the infrared optical lens further includes a diaphragm;
the diaphragm is disposed in an optical path between the second lens and the third lens.
Optionally, the infrared optical lens further includes an optical filter;
the optical filter is arranged in an optical path between the fifth lens and the image plane.
The utility model discloses infrared optical lens through the quantity and the focal power combination of lens in the reasonable infrared optical lens that sets up, the focal power numerical value of the reasonable third lens of setting up and fifth lens simultaneously guarantees to realize the on-vehicle infrared optical imaging lens of a miniaturization, the amount of light that leads to is big, higher image quality.
It should be understood that the statements herein are not intended to identify key or critical features of any embodiment of the present invention, nor are they intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an infrared optical lens according to an embodiment of the present invention;
fig. 2 is a schematic view illustrating curvature of field and distortion of an infrared optical lens according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a vertical axis aberration of an infrared optical lens according to an embodiment of the present invention;
fig. 4 is a schematic diagram of Ray-Fan of an infrared optical lens according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an infrared optical lens provided in the second embodiment of the present invention;
fig. 6 is a schematic view of curvature of field and distortion of an infrared optical lens according to an embodiment of the present invention;
fig. 7 is a schematic view illustrating a vertical axis aberration of an infrared optical lens according to a second embodiment of the present invention;
fig. 8 is a schematic diagram of Ray-Fan of an infrared optical lens according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of an infrared optical lens provided in the third embodiment of the present invention;
fig. 10 is a schematic view of curvature of field and distortion of an infrared optical lens according to a third embodiment of the present invention;
fig. 11 is a schematic diagram of a vertical axis aberration of an infrared optical lens system according to a third embodiment of the present invention;
fig. 12 is a schematic diagram of Ray-Fan of an infrared optical lens according to a third embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
Example one
Fig. 1 is a schematic structural diagram of an infrared optical lens provided by a first embodiment of the present invention, as shown in fig. 1, the first embodiment of the present invention provides an infrared optical lens including a first lens element 110, a second lens element 120, a third lens element 130, a fourth lens element 140, and a fifth lens element 150, which are sequentially arranged from an object plane to an image plane along an optical axis; the first lens 110 and the third lens 130 are negative focal power lenses, the second lens 120 and the third lensThe fourth lens 140 and the fifth lens 150 are both positive power lenses; the focal power of the third lens 130 is
The fifth lens 150 has an optical power of
The focal power of the infrared optical lens is
Wherein the content of the first and second substances,
specifically, the focal power is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam, which characterizes the ability of the optical system to deflect light. The larger the absolute value of the focal power is, the stronger the bending capability to the light ray is, and the smaller the absolute value of the focal power is, the weaker the bending capability to the light ray is. When the focal power is positive, the refraction of the light is convergent; when the focal power is negative, the refraction of the light is divergent. The optical power can be suitable for representing a certain refractive surface of a lens (namely, a surface of the lens), can be suitable for representing a certain lens, and can also be suitable for representing a system (namely a lens group) formed by a plurality of lenses together. In the infrared optical lens provided in the present embodiment, each lens may be fixed in one lens barrel (not shown in fig. 1), and the first lens 110 is set to be a negative power lens for controlling the incident angle of the optical system and correcting curvature of field; the second lens 120 and the fourth lens 140 are both positive focal power lenses for focusing light beams; the third lens 130 is a negative focal power lens for correcting off-axis aberrations including field curvature, coma, astigmatism, and the like; the fifth lens 150 is set to be a positive power lens for focusing the light beam and focusing the light beam on the image plane. The focal power of the whole infrared optical lens is distributed according to a certain proportion, and the balance of the incident angles of the front lens and the rear lens is ensured, so that the sensitivity of the lenses is reduced, and the stability of the lens is improved. The first embodiment is favorable for reducing distortion by reasonably configuring the focal power of each lens.
Further, the focal power of the third lens 130
Focal power of the fifth lens 150
And focal power of infrared optical lens
Satisfy the requirement of
Through reasonable setting of the focal power values of the third lens 130 and the fifth lens 150, the vehicle-mounted infrared optical imaging lens which is small in size, large in light transmission amount and high in image quality is guaranteed.
To sum up, the embodiment of the utility model provides an infrared optical lens, through the quantity and the focal power combination of lens in the reasonable infrared optical lens that sets up, the focal power numerical value of reasonable third lens and fifth lens that sets up simultaneously guarantees to realize a miniaturized, the amount of light that passes through is big, the on-vehicle infrared optical imaging lens of higher image quality.
On the basis of the above embodiment, the first lens power is
The second lens has an optical power of
The fourth lens has an optical power of
Wherein, the first and the second end of the pipe are connected with each other,
by reasonably distributing the focal power of each lens, the infrared optics is realizedThe spherical aberration and the curvature of field of the lens are small at the same time, and the image quality of the on-axis and off-axis view fields is ensured. Through the optical system formed by the lenses, the total length of the light path is short, so that the overall size of the lens is small.
In addition to the above embodiments, the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, and the fifth lens 150 are all glass spherical lenses.
Specifically, the spherical lens is characterized in that the spherical lens has constant curvature from the center of the lens to the periphery of the lens, and the arrangement mode of the spherical lens is simple. Furthermore, because the glass lens has a small coefficient of thermal expansion and good stability, the first lens 110, the second lens 120, the third lens 130, the fourth lens 140 and the fifth lens 150 are all glass spherical lenses, which can balance high and low temperatures, and is beneficial to keeping the focal length of the infrared optical lens stable when the ambient temperature used by the infrared optical lens changes greatly, for example, ensuring that the infrared optical lens has stable optical performance at-40 ℃ to 85 ℃. Meanwhile, the first lens 110, the second lens 120, the third lens 130, the fourth lens 140 and the fifth lens 150 are all glass spherical lenses, so that the total length of the lens can be reduced, and the miniaturization of the lens design is facilitated.
Furthermore, the material of glass spherical lens is various types of glass that the technical staff in this field can know, the embodiment of the utility model discloses it is no longer repeated here nor does the restriction.
In addition to the above embodiments, the refractive index of the second lens 120 is n2, the refractive index of the third lens 130 is n3, the refractive index of the fourth lens 140 is n4, and the refractive index of the fifth lens 150 is n5; wherein 1.85-n 2-n 3-n 1.71, 1.85-n 4-n 2.05, 1.71-n 5-n 1.91.
The refractive index is the ratio of the propagation speed of light in vacuum to the propagation speed of light in the medium, and is mainly used for describing the refractive power of materials to light, and the refractive indexes of different materials are different. Therefore, the refractive indexes of all lenses in the infrared optical lens are matched, so that the infrared optical lens is beneficial to realizing the miniaturization design; meanwhile, the method is favorable for realizing higher pixel resolution and larger aperture.
On the basis of the above embodiment, the focal length of the infrared optical lens is f, and the optical back focus of the infrared optical lens is BFL; wherein BFL/f is more than or equal to 0 and less than or equal to 2. So set up in less within range through the ratio of burnt after the optics with infrared optical lens and focus, be favorable to realizing infrared optical lens's miniaturized design, if the ratio of burnt after the optics of infrared optical lens and focus surpasss this ratio scope, for example infrared optical lens's burnt value is great after the optics, is so unfavorable for realizing infrared optical lens's miniaturized design.
On the basis of the above embodiment, the clear aperture of the infrared optical lens is F #, and the total length of the infrared optical lens is TTL; wherein: f #/TTL is not less than 0.1 and not more than 0.4, so that the infrared optical lens can have larger light transmission quantity.
On the basis of the above embodiment, the infrared optical lens may further include a diaphragm 160, which may be disposed in an optical path between the second lens 120 and the third lens 130.
Specifically, the infrared optical lens can further comprise a diaphragm, the propagation direction of the light beam can be adjusted by arranging the diaphragm, and the imaging quality is improved. The diaphragm may be located in the optical path between the second lens 120 and the third lens 130, but the embodiment of the present invention is not limited to the specific location of the diaphragm.
On the basis of the above embodiment, the infrared optical lens may further include a filter 170, and the filter 170 may be disposed in an optical path between the fifth lens 150 and an image plane (not shown in the figure). The optical filter 170 may filter out interference light other than infrared light, and improve an imaging effect of the infrared optical lens.
As a possible embodiment, the optical power, the surface type, the radius of curvature, the thickness, the refractive index, and the abbe number of each lens in the infrared optical lens will be described below.
TABLE 1 focal power design values for respective lenses in an infrared optical lens
TABLE 2 design values of surface type, radius of curvature, thickness, refractive index and Abbe number of infrared optical lens
| Number of noodles | Type of noodle | Radius/mm | Thickness/mm | Refractive index | Abbe number |
| OBJ | Article surface | Infinity | 500.00 | ||
| S1 | Spherical surface | 8.33 | 0.5 | 1.52 | 64.2 |
| S2 | Spherical surface | 1.97 | 0.55 | ||
| S3 | Spherical surface | 6.05 | 1.1 | 1.90 | 31.3 |
| S4 | Spherical surface | 31.26 | 0.2 | ||
| S5 | Diaphragm | Infinity | 0.1 | ||
| S6 | Spherical surface | 18.13 | 1.79 | 1.52 | 56.8 |
| S7 | Spherical surface | 7.96 | 0.36 | ||
| S8 | Spherical surface | -7.60 | 1.57 | 1.90 | 31.3 |
| S9 | Spherical surface | -3.28 | 0.1 | ||
| S10 | Spherical surface | 5.62 | 1.63 | 1.83 | 42.7 |
| S11 | Spherical surface | 16.94 | 0.3 | ||
| S12 | Spherical surface | Infinity | 0.7 | 1.52 | 64.2 |
| S13 | Spherical surface | Infinity | 3.13 |
The surface numbers are numbered according to the surface order of the respective lenses, "S1" represents the object side surface of the first lens 110, "S2" represents the image side surface of the first lens 110, and so on. The radius of curvature represents the degree of curvature of the lens surface, positive values represent the surface being curved toward the image plane side, and negative values represent the surface being curved toward the object plane side, where infinite radius of curvature represents the surface being flat. The thickness represents the central axial distance from the current surface to the next surface. The refractive index represents the ability of the material between the current surface and the next surface to deflect light, the blank space represents that the current position is air, and the refractive index is 1. The abbe number represents the dispersion characteristic of the material between the current surface and the next surface to light, and the blank space represents that the current position is air.
Further, fig. 2 is a schematic diagram of curvature of field and distortion of an infrared optical lens according to an embodiment of the present invention, as shown in fig. 2, in a left coordinate system, a horizontal coordinate represents a size of the curvature of field, and a unit is mm; the vertical coordinate represents the normalized image height, with no units; wherein T represents meridian and S represents arc loss; as can be seen from fig. 2, the infrared optical lens provided by this embodiment is effectively controlled in curvature of field from light with a wavelength of 0.925 μm to light with a wavelength of 0.955 μm, i.e. when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the right-hand coordinate system, the horizontal coordinate represents the magnitude of distortion in units; the vertical coordinate represents the normalized image height, with no units; as can be seen from fig. 2, the distortion of the infrared optical lens provided by the embodiment is within 20%, which is better corrected, the imaging distortion is smaller, and the requirement of low distortion is met.
Further, fig. 3 is a schematic diagram of a vertical axis aberration of an infrared optical lens according to an embodiment of the present invention, as shown in fig. 3, a vertical axis in the diagram is a dimensionless quantity, which indicates a normalized entrance pupil radius, and an abscissa indicates a distance from an image plane to an intersection point of a light ray and an optical axis, and aberrations of the infrared optical lens at different wavelengths (0.925 μm, 0.940 μm, and 0.955 μm) are all within a range of ± 0.04mm, which indicates that the vertical axis aberration of the infrared optical lens is well corrected.
Fig. 4 the embodiment of the utility model provides a pair of infrared optical lens's Ray-Fan's schematic diagram, light Fan graph show light and image planes intersect the difference between coordinate and chief Ray and the image planes intersect the coordinate, and the cross axis scale of light Fan graph is the income pupil coordinate of normalization. As shown in fig. 4, the difference values of the different wavelengths of light (0.925 μm, 0.940 μm and 0.955 μm) in the different field angles of the infrared optical lens are in a small range, which indicates that the infrared optical lens has a very effective correction for chromatic aberration, thereby being beneficial to realizing high pixel performance.
To sum up, the embodiment of the utility model provides an infrared optical lens, through the quantity that rationally sets up lens, the focal power of lens and concrete numerical value, the type of lens, the specific relation between the optical back focal length of non-light tight refracting index infrared optical lens and the focus and the proportional relation between infrared optical lens's clear aperture and overall length, guarantee to realize the on-vehicle infrared optical imaging lens of a miniaturization, the light flux is big, higher image quality.
Example two
Fig. 5 is a schematic diagram of an infrared optical lens provided by the second embodiment of the present invention, as shown in fig. 5, the second embodiment of the present invention provides an infrared optical lens including following the optical axis from theThe lens comprises a first lens 110, a second lens 120, a third lens 130, a fourth lens 140 and a fifth lens 150 which are sequentially arranged from an object plane to an image plane; the first lens 110 and the third lens 130 are both negative focal power lenses, and the second lens 120, the fourth lens 140 and the fifth lens 150 are all positive focal power lenses; the focal power of the third lens 130 is
The fifth lens 150 has an optical power of
The focal power of the infrared optical lens is
Wherein the content of the first and second substances,
the material and surface shape of each lens are the same as those of the first embodiment, and are not described herein again.
Table 3 illustrates the power of each lens in an infrared optical lens in another possible embodiment
TABLE 3 focal power design values of respective lenses in infrared optical lens
Table 4 illustrates, in another possible embodiment, the surface type, the radius of curvature, the thickness, the refractive index, and the abbe number of each lens in the infrared optical lens.
TABLE 4 design values of surface type, radius of curvature, thickness, refractive index, and Abbe number of infrared optical lens
| Number of noodles | Type of noodle | Radius/mm | Thickness/mm | Refractive index | Abbe number |
| OBJ | Article surface | Infinity | 500.00 | ||
| S1 | Spherical surface | 10.23 | 0.5 | 1.52 | 56.8 |
| S2 | Spherical surface | 2.12 | 0.74 | ||
| S3 | Spherical surface | 5.82 | 1.18 | 2.00 | 25.4 |
| S4 | Spherical surface | 63.21 | 0.15 | ||
| S5 | Diaphragm | Infinity | 0.1 | ||
| S6 | Spherical surface | 62.58 | 1.95 | 1.52 | 56.8 |
| S7 | Spherical surface | 7.37 | 0.36 | ||
| S8 | Spherical surface | -7.85 | 1.46 | 2.00 | 25.4 |
| S9 | Spherical surface | -3.56 | 0.1 | ||
| S10 | Spherical surface | 4.99 | 1.66 | 1.74 | 44.9 |
| S11 | Spherical surface | 16.03 | 0.3 | ||
| S12 | Spherical surface | Infinity | 0.7 | 1.52 | 64.2 |
| S13 | Spherical surface | Infinity | 2.84 |
The surface numbers are numbered according to the surface order of the respective lenses, "S1" represents the object side surface of the first lens 110, "S2" represents the image side surface of the first lens 110, and so on. The radius of curvature represents the degree of curvature of the lens surface, positive values represent the surface being curved toward the image plane side, and negative values represent the surface being curved toward the object plane side, where infinite radius of curvature represents the surface being flat. The thickness represents the central axial distance from the current surface to the next surface. The refractive index represents the ability of the material between the current surface and the next surface to deflect light, and the blank space represents that the current position is air and the refractive index is 1. The abbe number represents the dispersion characteristic of the material between the current surface and the next surface to light, and the blank space represents that the current position is air.
Further, fig. 6 is a schematic view of curvature of field and distortion of an infrared optical lens according to the second embodiment of the present invention, as shown in fig. 6, in a left coordinate system, a horizontal coordinate represents a size of the curvature of field, and a unit is mm; the vertical coordinate represents the normalized image height, with no units; wherein T represents meridian and S represents arc loss; as can be seen from fig. 6, the infrared optical lens provided by this embodiment is effectively controlled in curvature of field from light with a wavelength of 0.925 μm to light with a wavelength of 0.955 μm, i.e. when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the right-hand coordinate system, the horizontal coordinate represents the magnitude of distortion in units; the vertical coordinate represents the normalized image height, with no units; as can be seen from fig. 6, the distortion of the infrared optical lens provided by the embodiment is within 20%, which is better corrected, the imaging distortion is smaller, and the requirement of low distortion is met.
Further, fig. 7 is a schematic diagram of a vertical axis aberration of an infrared optical lens according to the second embodiment of the present invention, as shown in fig. 7, a vertical axis in the diagram is a dimensionless quantity, which represents a normalized entrance pupil radius, and an abscissa represents a distance from an image plane to an intersection of a light ray and an optical axis, and aberrations of the infrared optical lens at different wavelengths (0.925 μm, 0.940 μm, and 0.955 μm) are all within a range of ± 0.035mm, which indicates that the vertical axis aberration of the infrared optical lens is well corrected.
Fig. 8 the embodiment of the utility model provides a pair of Ray-Fan's of infrared optical lens schematic diagram, light Fan graph show light and image planes point of intersection coordinate and the difference between chief Ray and the image planes point of intersection coordinate, the cross axis scale of light Fan graph is normalized income pupil coordinate. As shown in fig. 8, the difference values of the different wavelengths of light (0.925 μm, 0.940 μm and 0.955 μm) in the different field angles of the infrared optical lens are in a small range, which indicates that the infrared optical lens has a very effective correction for chromatic aberration, thereby being beneficial to achieving high pixel performance.
To sum up, the embodiment of the utility model provides an infrared optical lens, through the quantity that rationally sets up lens, the focal power of lens and concrete numerical value, the type of lens, the specific relation between the optical back focal length of non-light tight refracting index infrared optical lens and the focus and the proportional relation between infrared optical lens's clear aperture and overall length, guarantee to realize the on-vehicle infrared optical imaging lens of a miniaturization, the light flux is big, higher image quality.
EXAMPLE III
Fig. 9 is a schematic structural diagram of an infrared optical lens provided by a third embodiment of the present invention, as shown in fig. 9, the infrared optical lens provided by the third embodiment of the present invention includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140 and a fifth lens 150, which are sequentially arranged from an object plane to an image plane along an optical axis; the first lens 110 and the third lens 130 are both negative focal power lenses, and the second lens 120, the fourth lens 140 and the fifth lens 150 are all positive focal power lenses; the third lens 130 has an optical power of
Fifth ray of dialysisThe focal power of the mirror 150 is
The focal power of the infrared optical lens is
Wherein the content of the first and second substances,
the material and surface shape of each lens are the same as those of the first embodiment, and are not described herein again.
Table 5 illustrates the power of each lens in the infrared optical lens in another possible embodiment
TABLE 5 focal power design values of respective lenses in infrared optical lens
Table 6, in another possible embodiment, illustrates the surface type, the radius of curvature, the thickness, the refractive index, and the abbe number of each lens in the infrared optical lens.
TABLE 6 design values of surface type, radius of curvature, thickness, refractive index, and Abbe number of infrared optical lens
| Noodle sequence number | Type of noodle | Radius/mm | Thickness/mm | Refractive index | Abbe number |
| OBJ | Article surface | Infinity | 500.00 | ||
| S1 | Spherical surface | 15.65 | 0.5 | 1.52 | 56.8 |
| S2 | Spherical surface | 2.15 | 0.53 | ||
| S3 | Spherical surface | 5.94 | 1.35 | 1.90 | 31.3 |
| S4 | Spherical surface | -22.59 | 0.10 | ||
| S5 | Diaphragm | Infinity | 0.13 | ||
| S6 | Spherical surface | -82.52 | 1.83 | 1.52 | 56.8 |
| S7 | Spherical surface | 7.54 | 0.34 | ||
| S8 | Spherical surface | -7.05 | 1.57 | 1.90 | 31.3 |
| S9 | Spherical surface | -3.34 | 0.1 | ||
| S10 | Spherical surface | 5.59 | 1.77 | 1.90 | 31.3 |
| S11 | Spherical surface | 15.20 | 0.3 | ||
| S12 | Spherical surface | Infinity | 0.7 | 1.52 | 64.2 |
| S13 | Spherical surface | Infinity | 3.59 |
The surface numbers are numbered according to the order of the surfaces of the respective lenses, "S1" represents the object side surface of the first lens 110, "S2" represents the image side surface of the first lens 110, and so on. The radius of curvature represents the degree of curvature of the lens surface, positive values represent the surface being curved toward the image plane side, and negative values represent the surface being curved toward the object plane side, where infinite radius of curvature represents the surface being flat. The thickness represents the central axial distance from the current surface to the next surface. The refractive index represents the ability of the material between the current surface and the next surface to deflect light, and the blank space represents that the current position is air and the refractive index is 1. The abbe number represents the dispersion characteristic of the material between the current surface and the next surface to light, and the blank space represents that the current position is air.
Further, fig. 10 is a schematic view of curvature of field and distortion of an infrared optical lens according to a third embodiment of the present invention, as shown in fig. 10, in a left-side coordinate system, a horizontal coordinate represents a size of the curvature of field, and a unit is mm; the vertical coordinate represents the normalized image height, with no units; wherein T represents meridian and S represents arc loss; as can be seen from fig. 10, the infrared optical lens provided by this embodiment is effectively controlled in curvature of field from light with a wavelength of 0.925 μm to light with a wavelength of 0.955 μm, i.e. when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the right-hand coordinate system, the horizontal coordinate represents the magnitude of distortion in units; the vertical coordinate represents the normalized image height, with no units; as can be seen from fig. 10, the distortion of the infrared optical lens provided by the embodiment is within 20%, which is better corrected, the imaging distortion is smaller, and the requirement of low distortion is met.
Further, fig. 11 is a schematic diagram of a vertical axis aberration of an infrared optical lens according to a third embodiment of the present invention, as shown in fig. 11, a vertical axis in the diagram is a dimensionless quantity, which indicates a normalized entrance pupil radius, and an abscissa indicates a distance from an image plane to an intersection of a light ray and an optical axis, and aberrations of the infrared optical lens at different wavelengths (0.925 μm, 0.940 μm, and 0.955 μm) are all within a range of ± 0.0375mm, which indicates that the vertical axis aberration of the infrared optical lens is well corrected.
Fig. 12 the embodiment of the present invention provides a Ray-Fan diagram of an infrared optical lens, in which the light Fan diagram represents the difference between the intersection coordinates of light and image plane and the intersection coordinates of chief Ray and image plane, and the cross scale of the light Fan diagram is the normalized entrance pupil coordinate. As shown in fig. 12, the difference values of the different wavelengths of light (0.925 μm, 0.940 μm and 0.955 μm) in the different field angles of the infrared optical lens are in a small range, which indicates that the infrared optical lens has a very effective correction for chromatic aberration, thereby being beneficial to achieving high pixel performance.
To sum up, the embodiment of the utility model provides an infrared optical lens, through the quantity that rationally sets up lens, the focal power of lens and concrete numerical value, the type of lens, the specific relation between the optical back focal length of non-light tight refracting index infrared optical lens and the focus and the proportional relation between infrared optical lens's clear aperture and overall length, guarantee to realize the on-vehicle infrared optical imaging lens of a miniaturization, the light flux is big, higher image quality.
The above detailed description does not limit the scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. An infrared optical lens is characterized by comprising a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from an object plane to an image plane along an optical axis;
the first lens and the third lens are negative focal power lenses, and the second lens, the fourth lens and the fifth lens are positive focal power lenses;
the focal power of the third lens is
The focal power of the fifth lens is
The focal power of the infrared optical lens is
Wherein the content of the first and second substances,
2. the infrared optical lens as set forth in claim 1, wherein the first lens power is
The focal power of the second lens is
The focal power of the fourth lens is
3. The infrared optical lens as recited in claim 1, wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all glass spherical lenses.
4. The infrared optical lens as defined by claim 1, wherein the refractive index of the second lens is n2, the refractive index of the third lens is n3, the refractive index of the fourth lens is n4, and the refractive index of the fifth lens is n5;
wherein 1.85-n 2-n 3-n 1.71, 1.85-n 4-n 2.05, 1.71-n 5-n 1.91.
5. The infrared optical lens of claim 1, characterized in that the focal length of the infrared optical lens is f, and the optical back focus of the infrared optical lens is BFL;
wherein BFL/f is more than or equal to 0 and less than or equal to 2.
6. The infrared optical lens as claimed in claim 1, wherein the clear aperture of the infrared optical lens is F #, and the total length of the infrared optical lens is TTL;
wherein: f #/TTL is more than or equal to 0.1 and less than or equal to 0.4.
7. The infrared optical lens as recited in claim 1, further comprising a diaphragm;
the diaphragm is disposed in an optical path between the second lens and the third lens.
8. The infrared optical lens as recited in claim 1, further comprising a filter;
the optical filter is arranged in an optical path between the fifth lens and the image plane.
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| CN202222053259.5U CN217879795U (en) | 2022-08-05 | 2022-08-05 | Infrared optical lens |
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| CN202222053259.5U CN217879795U (en) | 2022-08-05 | 2022-08-05 | Infrared optical lens |
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