CN112504474B - Optical system, lens module and electronic equipment - Google Patents

Optical system, lens module and electronic equipment Download PDF

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Publication number
CN112504474B
CN112504474B CN202011501408.9A CN202011501408A CN112504474B CN 112504474 B CN112504474 B CN 112504474B CN 202011501408 A CN202011501408 A CN 202011501408A CN 112504474 B CN112504474 B CN 112504474B
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optical system
lens
optical axis
optical
image
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CN112504474A (en
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乐宇明
蔡雄宇
许哲源
赵迪
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Tianjin OFilm Opto Electronics Co Ltd
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Tianjin OFilm Opto Electronics Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/0022—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiation of moving bodies
    • G01J5/0025—Living bodies
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/08—Optical arrangements
    • G01J5/0803—Arrangements for time-dependent attenuation of radiation signals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/02—Constructional details
    • G01J5/08—Optical arrangements
    • G01J5/0808—Convex mirrors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0025—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having one lens only
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J2005/0077—Imaging

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  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

An optical system, a lens module and an electronic device, the optical system sequentially comprises from an object side to an image side along an optical axis: the optical system comprises a diaphragm and a lens with positive refractive power, wherein the diaphragm is arranged at the object side of the optical system, the object side surface of the lens is a concave surface at the optical axis, the image side surface is a convex surface at the optical axis, and the object side surface or the image side surface of the lens is an aspheric surface; the optical system satisfies the relation: 11< CT1/| Sags1| < 14.5; wherein CT1 is the thickness of the lens on the optical axis, and | Sags1| is the distance parallel to the optical axis from the maximum clear aperture of the object-side surface of the lens to the intersection point of the object-side surface of the lens and the optical axis. By adopting the one-piece lens structure and reasonably designing the surface type and the refractive power of the lens, the object side of the lens is prevented from being excessively bent while the lens has high-resolution imaging quality, so that the edge aberration is reduced, and the thickness value of the lens is prevented from being excessively large, so that the weight of the lens is reduced, and the light weight and the miniaturization of an imaging lens are favorably realized.

Description

Optical system, lens module and electronic equipment
Technical Field
The invention belongs to the technical field of optical imaging, and particularly relates to an optical system, a lens module and electronic equipment.
Background
The infrared thermal imaging technique is a technique of converting the temperature distribution of the surface of an object into an image visible to the human eye and displaying the temperature distribution of the surface of the object in different colors. The infrared thermal imaging technology enables human beings to surpass visual barriers, so that people can see the temperature distribution condition of the surface of an object, non-contact and remote temperature detection or imaging is realized, and the infrared thermal imaging technology has the advantages of high response speed, high accuracy and the like, and is widely applied to the fields of industrial detection, disease diagnosis, military detection and the like.
Most of infrared lenses in the current market have low resolution and poor imaging quality. In addition, the imaging quality of the optical system is improved by using the diffraction surface, so that the optical system structure is more complicated, and it is difficult to achieve the weight reduction and the miniaturization of the infrared lens and the infrared thermal imaging apparatus.
Disclosure of Invention
The invention aims to provide an optical system, a lens module and an electronic device, which have the characteristics of high resolution, light weight and miniaturization.
In order to realize the purpose of the invention, the invention provides the following technical scheme:
in a first aspect, the present invention provides an optical system, in order from an object side to an image side along an optical axis direction, comprising: a diaphragm disposed on an object side of the optical system; the lens with positive refractive power has a concave object-side surface at the optical axis and a convex image-side surface at the optical axis; the object side surface and the image side surface of the lens are both aspheric surfaces; the optical system satisfies the relation: 11< CT1/| Sags1| < 14.5; wherein CT1 is the thickness of the lens on the optical axis, and | Sags1| is the distance parallel to the optical axis from the maximum clear aperture of the object-side surface of the lens to the intersection point of the object-side surface of the lens and the optical axis.
By adopting the one-piece lens structure, the surface shape and the refractive power of the lens are reasonably designed, so that the lens has high-resolution imaging quality. Meanwhile, the optical system satisfies the relational expression, so that the object side of the lens can be prevented from being bent too much, the edge aberration is reduced, and the imaging quality is improved. In addition, the excessive thickness value of the lens can be avoided by satisfying the relational expression, so that the weight of the lens is reduced, and the light weight and the miniaturization of the imaging lens are favorably realized.
In one embodiment, the optical system satisfies the relationship: 3< Rs2/| Sags2| < 5; wherein Rs2 is the curvature radius of the image side surface of the lens at the optical axis, and | Sags2| is the distance from the maximum clear aperture of the image side surface of the lens to the intersection point of the object side surface of the lens and the optical axis, which is parallel to the optical axis. The lens meets the above relational expression, which is beneficial to effectively correcting astigmatism generated by light rays refracted by the surface of the lens while ensuring the refractive power strength of the lens, and simultaneously avoiding the increase of processing difficulty of the lens caused by the excessive bending of the image side surface of the lens. When Rs2/| Sags2| ≦ 3, the lens may have insufficient refractive power strength, resulting in insufficient aberration correction. When the Rs2/| Sags2| ≧ 5, the image side is too curved, which increases the processing difficulty of the lens, and causes the problems of glass breakage and the like in the aspheric surface process molding process.
In one embodiment, the optical system satisfies the relationship: 2.5< (Rs1+ Rs2)/(Rs1-Rs2) < 4.5; wherein Rs1 is the radius of curvature of the lens object side surface at the optical axis, and Rs2 is the radius of curvature of the lens image side surface at the optical axis. Satisfying above-mentioned relational expression, be favorable to the refraction to penetrate into the light beam of lens expands beam width, makes the abundant effectual transmission of light to photosensitive element to improve optical system's pixel and resolution ratio.
In one embodiment, the optical system satisfies the relationship: 1< TTL/f < 3; wherein, TTL is a distance on an optical axis from an object side surface of the lens to an image plane, and f is an effective focal length of the optical system. Satisfying above-mentioned relational expression, can not only realizing optical lens miniaturization, can guaranteeing that light better assembles on the image plane simultaneously. When TTL/f is less than or equal to 1, the optical length of the lens group is too short, which increases the sensitivity of the optical system and is not beneficial to the convergence of light on the imaging surface. When TTL/f is greater than or equal to 3, the optical length of the lens group is too long, the angle of the main light ray of the light ray entering the imaging surface is too large, and the light ray at the edge of the imaging surface of the optical system cannot be imaged on the photosensitive surface, so that imaging information is incomplete.
In one embodiment, the optical system satisfies the relationship: 1mm < Imgh/Tan (1/2FOV) <2.5 mm; where Imgh is half the image height corresponding to the maximum angle of view of the optical system, and FOV is the maximum angle of view of the optical system. Satisfy above-mentioned relational expression, the accessible will shoot focus and distortion and carry out reasonable setting in order to obtain the formation of image effect of preferred, reduce the angle that light penetrated into sensitization chip simultaneously, improve the sensitization performance. If the distance exceeds the range of the relational expression, the angle of view is insufficient, and sufficient object space information cannot be obtained.
In one embodiment, the optical system satisfies the relationship: 80<V10.6<150; wherein, V10.6Is the abbe number of the optical system at an infrared wavelength of 10.6 um. The method meets the relational expression, is favorable for optimizing aberration, realizes the improvement of long-wave infrared system pixels and enhances the imaging resolution.
In one embodiment, the optical system satisfies the relationship: 2<N10.6<3; wherein N is10.6Is the refractive index of the optical system at an infrared wavelength of 10.6 um. The relation is satisfied, the correction of the optical path difference of the single-wavelength infrared light is facilitated, and meanwhile, the homogenization of the light spots can be ensured.
In one embodiment, the optical system satisfies the relationship: f/EPD is more than 1 and less than 1.2; where EPD is the entrance pupil diameter of the optical system and f is the effective focal length of the optical system. The optical system has the effect of a large aperture and a far field depth range, realizes infinite clear imaging, and simultaneously can still have clear resolving power for close scenery.
In a second aspect, the present invention further provides a lens module including the optical system described in any one of the embodiments of the first aspect. By adding the optical system provided by the invention into the lens module, the lens module has high resolution and high imaging quality by reasonably designing the surface shape and the refractive power of the lens, and meanwhile, the weight of the lens can be reduced by reducing the thickness of the lens, so that the miniaturization and the light weight of the lens module are easy to realize.
In a third aspect, the present invention further provides an electronic device, which includes a housing and the lens module set in the second aspect, wherein the lens module set is disposed in the housing. By adding the lens module provided by the invention into the electronic equipment, the electronic equipment has the characteristics of miniaturization and light weight while having higher resolution and better imaging quality.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic configuration diagram of an optical system of a first embodiment;
FIG. 2 is a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the first embodiment;
FIG. 3 is a schematic structural view of an optical system of a second embodiment;
FIG. 4 is a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the second embodiment;
fig. 5 is a schematic structural view of an optical system of a third embodiment;
FIG. 6 is a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the third embodiment;
fig. 7 is a schematic configuration diagram of an optical system of a fourth embodiment;
FIG. 8 is a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the fourth embodiment;
fig. 9 is a schematic configuration diagram of an optical system of the fifth embodiment;
FIG. 10 is a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the fifth embodiment;
Detailed Description
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 apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The optical system provided in the embodiments of the present invention sequentially includes, from an object side to an image side along an optical axis direction: a diaphragm, a lens and a protective plate. Specifically, the diaphragm is disposed on the object side of the optical system, and the protection plate is disposed on the image side of the optical system, so as to protect the optical imaging lens, where the protection plate may be a glass plate, a transparent plastic plate, or the like; the lens element with positive refractive power has a concave object-side surface and a convex image-side surface. The optical system satisfies the relation: 11< CT1/| Sags1| < 14.5; wherein CT1 is the thickness of the lens on the optical axis, and | Sags1| is the distance parallel to the optical axis from the maximum clear aperture of the object-side surface of the lens to the intersection point of the object-side surface of the lens and the optical axis.
By adopting the one-piece lens structure, the surface shape and the refractive power of the lens are reasonably designed, so that the lens has high-resolution imaging quality. Meanwhile, the optical system satisfies the relational expression, so that the object side of the lens can be prevented from being excessively bent, the edge aberration is reduced, and the imaging quality is improved. In addition, the excessive thickness value of the lens can be avoided by satisfying the relational expression, so that the weight of the lens is reduced, and the light weight and the miniaturization of the imaging lens are favorably realized.
In one embodiment, the optical system satisfies the relationship: 3< Rs2/| Sags2| < 5; wherein Rs2 is the curvature radius of the image-side surface of the lens at the optical axis, and | Sags2| is the distance parallel to the optical axis from the maximum clear aperture of the image-side surface of the lens to the intersection point of the object-side surface of the lens and the optical axis. The lens meets the relation, which is beneficial to effectively correcting astigmatism generated by the refraction of light rays through the surface of the lens while ensuring the refractive power strength of the lens, and simultaneously avoiding the processing difficulty increase of the lens caused by the excessive bending of the image side surface of the lens. When Rs2/| Sags2| ≦ 3, the lens will have insufficient refractive power strength, resulting in insufficient aberration correction. When the Rs2/| Sags2| ≧ 5, the image side is too curved, which increases the processing difficulty of the lens, and causes the problems of glass breakage and the like in the aspheric surface process molding process.
In one embodiment, the optical system satisfies the relationship: 2.5< (Rs1+ Rs2)/(Rs1-Rs2) < 4.5; wherein Rs1 is the radius of curvature of the object-side surface of the lens at the optical axis, and Rs2 is the radius of curvature of the image-side surface of the lens at the optical axis. Satisfying above-mentioned relational expression, being favorable to the beam of inflection entering lens, expanding beam width makes the abundant effectual transmission of light to the photosensitive element to improve the pixel and the resolution ratio of system.
In one embodiment, the optical system satisfies the relationship: 1< TTL/f < 3; wherein, TTL is the distance on the optical axis from the object side surface of the lens to the image plane, and f is the effective focal length of the optical system. Satisfying above-mentioned relational expression, can not only realizing optical lens miniaturization, can guaranteeing that light better assembles on the image plane simultaneously. When TTL/f is less than or equal to 1, the optical length of the lens group is too short, which increases the sensitivity of the optical system and is not beneficial to the convergence of light on the imaging surface. When TTL/f is greater than or equal to 3, the optical length of the lens group is too long, the angle of the main light ray of the light ray entering the imaging surface is too large, and the light ray at the edge of the imaging surface of the optical system cannot be imaged on the photosensitive surface, so that imaging information is incomplete.
In one embodiment, the optical system satisfies the relationship: 1mm < Imgh/Tan (1/2FOV) <2.5 mm; where Imgh is half the image height corresponding to the maximum angle of view of the optical system, and FOV is the maximum angle of view of the optical system. Satisfy above-mentioned relational expression, the accessible will shoot focus and distortion and carry out reasonable setting in order to obtain the formation of image effect of preferred, reduce the angle that light penetrated into sensitization chip simultaneously, improve the sensitization performance. If the distance exceeds the range of the relational expression, the angle of view is insufficient, and sufficient object space information cannot be obtained.
In one embodiment, the optical system satisfies the relationship: 80<V10.6<150; wherein, V10.6Is the abbe number of the optical system at an infrared wavelength of 10.6 um. The method meets the relational expression, is favorable for optimizing aberration, realizes the improvement of long-wave infrared system pixels and enhances the imaging resolution.
In one embodiment, the optical system further comprises a diaphragm, and the optical system satisfies the relation: 2<N10.6<3; wherein N is10.6Is the refractive index of the optical system at an infrared wavelength of 10.6 um. Satisfies the above relation, and is favorable for single wavelengthThe infrared ray optical path difference is corrected, and meanwhile, the homogenization of light spots can be ensured.
In one embodiment, the optical system satisfies the relationship: f/EPD is more than 1 and less than 1.2; where EPD is the entrance pupil diameter of the optical system and f is the effective focal length of the optical system. The optical system has the effect of a large aperture and a far field depth range by setting and controlling the light incoming quantity and the diaphragm number of the optical system through the setting of parameters, and the near scenery still has clear resolving power while realizing infinite clear imaging.
The embodiment of the invention provides a lens module, which comprises the optical system provided by the embodiment of the invention. The lens module can be an imaging module integrated on the electronic equipment, and can also be an independent lens. By adding the optical system provided by the invention into the lens module, the lens module has high resolution and high imaging quality by reasonably designing the surface shape and the refractive power of the lens, and meanwhile, the weight of the lens can be reduced by reducing the thickness of the lens, so that the miniaturization and the light weight of the lens module are easy to realize.
The embodiment of the invention provides electronic equipment, which comprises a shell and a lens module provided by the embodiment of the invention, wherein the lens module is arranged in the shell. Furthermore, the electronic device may further include an electronic photosensitive element, a photosensitive surface of the electronic photosensitive element is located on an imaging surface of the optical system, and light rays of an object incident on the photosensitive surface of the electronic photosensitive element through the lens may be converted into an electrical signal of an image. The electron sensor may be a Complementary Metal Oxide Semiconductor (CMOS) or a Charge-coupled Device (CCD). The electronic equipment can be a thermal imager for industrial equipment detection, medical equipment for disease diagnosis, an infrared thermometer for body temperature detection and the like, and can also be electronic equipment which can utilize infrared thermal imaging technology at will, such as a military night vision device, a forest fire monitor and the like. By adding the lens module provided by the invention into the electronic equipment, the electronic equipment has the characteristics of miniaturization and light weight while having higher resolution and better imaging quality.
First embodiment
Referring to fig. 1 and fig. 2, the optical system of the present embodiment, in order from an object side to an image side along an optical axis direction, includes:
stop STO, stop STO is disposed on the object side of the optical system.
The lens element L1 with positive refractive power has a concave object-side surface S1 and a convex image-side surface S2, respectively, and is aspheric on both the object-side surface S1 and the image-side surface S2 of the lens element L1.
And a protective plate P including a light incident surface S3 and a light exiting surface S4.
In addition, the optical system further includes an imaging plane IMG. In this embodiment, the protection plate P is disposed at the image side of the optical system, so as to protect the optical imaging lens. The stop STO is used to control the amount of light entering.
Table 1a shows a table of characteristics of the optical system of the present embodiment, in which data of focal length is obtained using infrared light having a reference wavelength of 10000nm, and material refractive index and abbe number are obtained using visible light having a reference wavelength of 587.56nm, and units of Y radius, thickness and effective focal length are millimeters (mm).
TABLE 1a
Figure BDA0002843585750000061
Figure BDA0002843585750000071
Wherein f is the effective focal length of the optical system, FNO is the f-number of the optical system, and FOV is the maximum field angle of the optical system.
In the present embodiment, the object-side surface S1 and the image-side surface of the lens L1 are both aspheric surfaces S2, and the aspheric surface x can be defined by, but not limited to, the following aspheric surface formula:
Figure BDA0002843585750000072
wherein x is the distance from the corresponding point on the aspheric surface to the plane tangent to the surface vertex, h is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric surface vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspheric surface type formula. Table 1b shows the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the aspherical mirrors S1 and S2 in the first embodiment.
TABLE 1b
Number of noodles S1 S2
K 1.331E+01 -1.192E-01
A4 -1.147E-01 1.475E-02
A6 6.319E-01 -3.733E-02
A8 -2.335E+00 3.906E-02
A10 4.525E+00 -2.283E-02
A12 -4.841E+00 7.477E-03
A14 2.689E+00 -1.284E-03
A16 -6.085E-01 8.978E-05
A18 0.000E+00 0.000E+00
A20 0.000E+00 0.000E+00
Fig. 2 (a) shows a longitudinal spherical aberration curve of the optical system of the first embodiment at wavelengths of 12000.0000nm, 11000.0000nm, 10000.0000nm, 9000.0000nm and 8000.0000nm, wherein the abscissa in the X-axis direction represents the focus shift, the ordinate in the Y-axis direction represents the normalized field of view, and the longitudinal spherical aberration curve represents the convergent focus deviation of light rays of different wavelengths after passing through the respective lenses of the optical system. As can be seen from fig. 2 (a), the spherical aberration value of the optical system in the first embodiment is better, which illustrates that the imaging quality of the optical system in this embodiment is better.
Fig. 2 (b) also shows an astigmatism graph of the optical system of the first embodiment at a wavelength of 10000.0000nm, in which the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height in mm. The astigmatism curves represent the meridional imaging plane curvature T and the sagittal imaging plane curvature S. As can be seen from (b) of fig. 2, astigmatism of the optical system is well compensated.
Fig. 2 (c) also shows a distortion curve of the optical system of the first embodiment at a wavelength of 10000.0000 nm. The abscissa along the X-axis direction represents the focus offset, the ordinate along the Y-axis direction represents the image height, and the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from (c) in fig. 2, the distortion of the optical system is well corrected at a wavelength of 10000.0000 nm.
As can be seen from (a), (b), and (c) in fig. 2, the optical system of the present embodiment has small aberration, good imaging quality, and good imaging quality.
Second embodiment
Referring to fig. 3 and 4, the optical system of the present embodiment, in order from an object side to an image side along an optical axis direction, includes:
stop STO, stop STO is disposed on the object side of the optical system.
The lens element L1 with positive refractive power has a concave object-side surface S1 and a convex image-side surface S2 along the optical axis of the lens element L1, and both the object-side surface S1 and the image-side surface S2 are aspheric.
And a protective plate P including a light incident surface S3 and a light exiting surface S4.
Table 2a shows a table of characteristics of the optical system of the present embodiment, in which data of focal length is obtained using infrared light having a reference wavelength of 10000nm, and data of refractive index of material and visible light having an abbe number reference wavelength of 587.56nm, and units of the Y radius, thickness and effective focal length are millimeters (mm), and other parameters have the same meanings as those of the first embodiment.
TABLE 2a
Figure BDA0002843585750000081
Table 2b gives the coefficients of high order terms that can be used for each aspherical mirror in the second embodiment, wherein each aspherical mirror type can be defined by the formula given in the first embodiment.
TABLE 2b
Number of noodles S2 S3
K 1.971E+01 7.060E-01
A4 -6.361E-02 2.442E-02
A6 5.049E-01 -3.888E-02
A8 -2.121E+00 3.855E-02
A10 4.356E+00 -2.132E-02
A12 -4.784E+00 6.818E-03
A14 2.689E+00 -1.167E-03
A16 -6.085E-01 8.408E-05
A18 0.000E+00 0.000E+00
A20 0.000E+00 0.000E+00
FIG. 4 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the second embodiment, wherein the longitudinal spherical aberration curve represents the convergent focus deviations of light rays of different wavelengths after passing through the lenses of the optical system; the astigmatism curves represent meridional imaging plane curvature and sagittal imaging plane curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from the aberration diagram in fig. 4, the longitudinal spherical aberration, curvature of field, and distortion of the optical system are well controlled, so that the optical system of this embodiment has good imaging quality.
Third embodiment
Referring to fig. 5 and fig. 6, the optical system of the present embodiment, in order from an object side to an image side along an optical axis direction, includes:
stop STO, stop STO is disposed on the object side of the optical system.
The lens element L1 with positive refractive power has a concave object-side surface S1 and a convex image-side surface S2 along the optical axis of the lens element L1, and both the object-side surface S1 and the image-side surface S2 are aspheric.
And a protective plate P including a light incident surface S3 and a light exiting surface S4.
Table 3a shows a table of characteristics of the optical system of the present embodiment, in which data of focal length is obtained using infrared light having a reference wavelength of 10000nm, and data of refractive index of material and visible light having an abbe number reference wavelength of 587.56nm, and units of the Y radius, thickness and effective focal length are millimeters (mm), and other parameters have the same meanings as those of the first embodiment.
TABLE 3a
Figure BDA0002843585750000091
Figure BDA0002843585750000101
Table 3b gives the coefficients of high-order terms that can be used for each aspherical mirror surface in the third embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.
TABLE 3b
Number of noodles S2 S3
K -3.914E+00 6.573E-01
A4 -3.750E-02 1.023E-02
A6 4.204E-02 -1.283E-02
A8 -3.052E-01 1.049E-02
A10 6.840E-01 -4.840E-03
A12 -8.222E-01 1.320E-03
A14 5.099E-01 -1.958E-04
A16 -1.325E-01 1.242E-05
A18 0.000E+00 0.000E+00
A20 0.000E+00 0.000E+00
FIG. 6 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the third embodiment, wherein the longitudinal spherical aberration curves represent the convergent focus deviations of light rays of different wavelengths after passing through the lenses of the optical system; the astigmatism curves represent meridional imaging plane curvature and sagittal imaging plane curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from the aberration diagram in fig. 6, the longitudinal spherical aberration, curvature of field, and distortion of the optical system are well controlled, so that the optical system of this embodiment has good imaging quality.
Fourth embodiment
Referring to fig. 7 and 8, the optical system of the present embodiment, in order from an object side to an image side along an optical axis direction, includes:
stop STO, stop STO is disposed on the object side of the optical system.
The lens element L1 with positive refractive power has a concave object-side surface S1 and a convex image-side surface S2 along the optical axis of the lens element L1, and both the object-side surface S1 and the image-side surface S2 are aspheric.
And a protective plate P including a light incident surface S3 and a light exiting surface S4.
Table 4a shows a table of characteristics of the optical system of the present embodiment, in which data of focal length is obtained using infrared light having a reference wavelength of 10000nm, and data of refractive index of material and visible light having an abbe number reference wavelength of 587.56nm, and units of the Y radius, thickness and effective focal length are millimeters (mm), and other parameters have the same meanings as those of the first embodiment.
TABLE 4a
Figure BDA0002843585750000102
Figure BDA0002843585750000111
Table 4b gives the coefficients of high-order terms that can be used for each aspherical mirror surface in the fourth embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.
TABLE 4b
Number of noodles S2 S3
K 6.442E+00 9.239E-01
A4 -3.765E-02 1.966E-02
A6 1.308E-01 -2.832E-02
A8 -6.231E-01 2.748E-02
A10 1.311E+00 -1.517E-02
A12 -1.520E+00 4.953E-03
A14 9.223E-01 -8.748E-04
A16 -2.332E-01 6.556E-05
A18 0.000E+00 0.000E+00
A20 0.000E+00 0.000E+00
FIG. 8 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the fourth embodiment, wherein the longitudinal spherical aberration curves represent the convergent focus deviations of light rays of different wavelengths after passing through the lenses of the optical system; the astigmatism curves represent meridional imaging plane curvature and sagittal imaging plane curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from the aberration diagram in fig. 8, the longitudinal spherical aberration, curvature of field, and distortion of the optical system are well controlled, so that the optical system of this embodiment has good imaging quality.
Fifth embodiment
Referring to fig. 9 and 10, the optical system of the present embodiment, in order from an object side to an image side along an optical axis direction, includes:
stop STO, stop STO is disposed on the object side of the optical system.
The lens element L1 with positive refractive power has a concave object-side surface S1 and a convex image-side surface S2 along the optical axis of the lens element L1, and both the object-side surface S1 and the image-side surface S2 are aspheric.
And a protective plate P including a light incident surface S3 and a light exiting surface S4.
Table 5a shows a table of characteristics of the optical system of the present embodiment in which data of focal length is obtained using infrared light having a reference wavelength of 10000nm, material refractive index and abbe number are obtained using visible light having a reference wavelength of 587.56nm, and units of Y radius, thickness and effective focal length are millimeters (mm), wherein the other parameters have the same meanings as those of the first embodiment.
TABLE 5a
Figure BDA0002843585750000121
Table 5b shows the high-order term coefficients that can be used for each aspherical mirror surface in the fifth embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.
TABLE 5b
Number of noodles S2 S3
K -1.064E+01 1.118E+00
A4 -1.981E-02 3.165E-02
A6 -8.257E-02 -5.149E-02
A8 5.858E-02 6.042E-02
A10 -6.508E-03 -4.019E-02
A12 -1.891E-02 1.584E-02
A14 0.00E+00 -3.395E-03
A16 0.00E+00 3.112E-04
A18 0.00E+00 0.00E+00
A20 0.00E+00 0.00E+00
FIG. 10 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the fifth embodiment, wherein the longitudinal spherical aberration curves represent convergent focus deviations of light rays of different wavelengths after passing through respective lenses of the optical system; the astigmatism curves represent meridional imaging plane curvature and sagittal imaging plane curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from the aberration diagram in fig. 10, the longitudinal spherical aberration, curvature of field, and distortion of the optical system are well controlled, so that the optical system of this embodiment has good imaging quality.
Table 6 shows CT1/| Sags1|, Rs2/| Sags2|, (Rs1+ Rs2)/(Rs1-Rs2), TTL/f, Imgh/Tan (1/2FOV), V in the optical systems of the first to fifth embodiments10.6、N10.6f/EPD.
TABLE 6
Figure BDA0002843585750000122
Figure BDA0002843585750000131
As can be seen from table 6, the optical systems of the first to fifth embodiments all satisfy the following relations: 11<CT1/|Sags1|<14.5、3<Rs2/|Sags2|<5、2.5<(Rs1+Rs2)/(Rs1-Rs2)<4.5、1<TTL/f<3、1mm<Imgh/Tan(1/2FOV)<2.5mm、80<V10.6<150、2<N10.6<3. A value of 1< f/EPD < 1.2.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.

Claims (10)

1. An optical system, comprising, in order from an object side to an image side along an optical axis:
a diaphragm;
the lens with positive refractive power has a concave object-side surface at the optical axis and a convex image-side surface at the optical axis;
the object side surface or the image side surface of the lens is an aspheric surface;
the optical system is composed of a piece of the lens, and the optical system satisfies the relation: 11< CT1/| Sags1| < 14.5; wherein CT1 is the thickness of the lens on the optical axis, and | Sags1| is the distance parallel to the optical axis from the maximum clear aperture of the object-side surface of the lens to the intersection point of the object-side surface of the lens and the optical axis.
2. The optical system of claim 1, wherein the optical system satisfies the relationship:
3<Rs2/|Sags2|<5；
wherein Rs2 is the curvature radius of the image side surface of the lens at the optical axis, and | Sags2| is the distance from the maximum clear aperture of the image side surface of the lens to the intersection point of the object side surface of the lens and the optical axis, which is parallel to the optical axis.
3. The optical system of claim 1, wherein the optical system satisfies the relationship:
2.5<(Rs1+Rs2)/(Rs1-Rs2)<4.5；
wherein Rs1 is the radius of curvature of the lens object side surface at the optical axis, and Rs2 is the radius of curvature of the lens image side surface at the optical axis.
4. The optical system of claim 1, wherein the optical system satisfies the relationship:
1<TTL/f<3；
wherein, TTL is a distance on an optical axis from an object side surface of the lens to an image plane, and f is an effective focal length of the optical system.
5. The optical system of claim 1, wherein the optical system satisfies the relationship:
1mm<Imgh/Tan((1/2)*FOV)<2.5mm；
where Imgh is half the image height corresponding to the maximum angle of view of the optical system, and FOV is the maximum angle of view of the optical system.
6. The optical system of claim 1, wherein the optical system satisfies the relationship:
80<V10.6<150；
wherein, V10.6Is the abbe number of the optical system at an infrared wavelength of 10.6 um.
7. The optical system of claim 1, wherein the optical system satisfies the relationship:
2<N10.6<3；
wherein N is10.6For the optical system in the infraredThe refractive index at length 10.6 um.
8. The optical system of claim 1, wherein the optical system satisfies the relationship:
1<f/EPD＜1.2；
where EPD is the entrance pupil diameter of the optical system and f is the effective focal length of the optical system.
9. A lens module comprising the optical system of any one of claims 1 to 8.
10. An electronic apparatus, characterized in that the electronic apparatus comprises a housing and the lens module according to claim 9, the lens module being disposed in the housing.
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