CN114647071B - optical system - Google Patents
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- CN114647071B CN114647071B CN202210305661.XA CN202210305661A CN114647071B CN 114647071 B CN114647071 B CN 114647071B CN 202210305661 A CN202210305661 A CN 202210305661A CN 114647071 B CN114647071 B CN 114647071B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/02—Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
Abstract
The embodiment of the application provides an optical system, wherein a first lens group and a second lens group are sequentially arranged from an object side to an image side in the optical system; the optical axes of the lenses in the second lens group are overlapped; the first lens group comprises at least one free-form surface lens, and the object plane of the free-form surface lens deflects relative to the optical axis of the second lens group; the focal length of the lens is larger than a preset focal length threshold, and the difference degree between the focal length of the second lens group and the focal length of the optical system is smaller than the preset difference threshold. The lens which has long focal length, large aperture, and can extend depth of field and shoot high-quality images can be designed.
Description
Technical Field
The application relates to the technical field of optics, in particular to an optical system.
Background
For a long-focus lens, if the aperture is larger and the image plane is larger, the aperture of the lens is larger, and the aberration of an object positioned at the edge of the field of view is harder to correct; meanwhile, as the focal length is longer, the degree of deviation of the positions of the image planes when the images formed by different object distances are clear from the focusing is larger, namely, the smaller the range of the scene depth is, the quality of the shot image is affected.
How to design a lens with long focus and large aperture expansion depth of field so as to improve the quality of a shot image becomes a technical problem to be solved.
Disclosure of Invention
An object of an embodiment of the present application is to provide an optical system for designing a lens capable of capturing high-quality images with a long focal length, a large aperture, and a wide depth of field. The specific technical scheme is as follows:
the embodiment of the application provides an optical system with long focus and large aperture expansion depth of field, wherein a first lens group and a second lens group are sequentially arranged from an object direction image side in the optical system;
the optical axes of the lenses in the second lens group are overlapped;
the first lens group comprises a first lens, the first lens is a free-form surface lens, and the optical axis of the first lens deflects relative to the optical axis of the second lens group;
the focal length of the lens is larger than a preset focal length threshold, and the difference degree between the focal length of the second lens group and the focal length of the optical system is smaller than the preset difference threshold.
In one possible embodiment, the preset focal length threshold is 100mm and the difference threshold is 10% of the focal length of the optical system.
In one possible embodiment, the first lens group further comprises a second lens;
the second lens is arranged at the position closest to the object side in the second lens group;
the focal length of the second lens is negative, and the image plane and the object plane of the second lens are concave spherical surfaces.
In one possible embodiment, the first lens group further includes a third lens;
the third lens is arranged on the image side of the second lens;
the focal length of the third lens is positive, and the image plane and the object plane of the third lens are convex spherical surfaces;
the focal length of the third lens has a value range of (|F) 2 |，2*|F 2 I), wherein F 2 Is the focal length of the second lens.
In one possible embodiment, the first lens group further includes: a fourth lens;
the fourth lens is arranged on the image side of the third lens;
the focal length of the fourth lens is positive, the object plane of the fourth lens is a convex spherical surface, and the curvature radius of the object plane of the fourth lens is smaller than the curve radius of the image plane of the fourth lens.
In one possible embodiment, the second lens group includes: a fifth lens;
the fifth lens is arranged at the position closest to the object side in the second lens group;
and the focal length of the fifth lens is positive, and the object plane of the fifth lens is a convex spherical surface.
In one possible embodiment, the second lens group further includes: a sixth lens and a seventh lens;
the sixth lens is arranged on the image side of the fifth lens, and the seventh lens is arranged on the image side of the sixth lens;
the focal length of the sixth lens is negative, and the sixth lens is a meniscus lens or a plano-concave lens;
the focal length of the seventh lens is positive, the object plane of the fifth lens is a convex spherical surface, and the object plane of the sixth lens is adhered to the image plane of the sixth lens.
In one possible embodiment, the second lens group further includes: an eighth lens and a ninth lens;
the eighth lens is arranged on the image side of the sixth lens, and the ninth lens is arranged on the image side of the eighth lens;
the focal length of the eighth lens is positive, and the object plane and the image plane of the eighth lens are convex spherical surfaces;
the focal length of the ninth lens is negative, the object plane and the image plane of the ninth lens are concave spherical surfaces, and the object plane of the eighth lens is adhered to the image plane of the eighth lens;
a magnitude relation between a refractive index of the eighth lens and an abbe number of the ninth lens is opposite to a magnitude relation between an abbe number of the eighth lens and an abbe number of the ninth lens.
In one possible embodiment, the second lens group further includes: a tenth lens;
the tenth lens is arranged on the image side of the ninth lens, the focal length of the tenth lens is positive, and the object plane and the image plane of the tenth lens are convex spherical surfaces;
the temperature coefficient of the material of the tenth lens is larger than a preset coefficient threshold.
In one possible embodiment, the object plane of the tenth lens is adhered to the image plane of the ninth lens.
In one possible embodiment, the second lens group further includes an eleventh lens;
the eleventh lens is arranged on the image side of the tenth lens;
the focal length of the eleventh lens is positive, and the object plane of the eleventh lens is a convex spherical surface;
the range of the curvature radius of the object plane of the eleventh lens is (0.5×l11r2,1.5×l11r2), where L11R2 is the curvature radius of the image plane of the eleventh lens;
the distance between the eleventh lens and the image plane is greater than a preset distance threshold.
In one possible embodiment, the second lens group further includes a twelfth lens;
the twelfth lens is arranged on the image side of the eleventh lens;
the twelfth lens is a planar lens and is provided with a coating film for filtering non-visible light.
In one possible embodiment, each lens in the second lens group is made of glass.
The embodiment of the application has the beneficial effects that:
according to the long-focus large-aperture-spread-depth-of-field optical system provided by the embodiment of the application, the optical path difference caused by the fact that an object plane is not parallel to an image plane can be corrected through the first lens group arranged in front of the image plane and the free-form surface lens deflected in the first lens group, so that the long-focus large-aperture-spread-depth-of-field optical system is realized by solving the problem of long-focus large-aperture virtual focus during lens installation.
Of course, it is not necessary for any one product or method of practicing the application to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the application, and other embodiments may be obtained according to these drawings to those skilled in the art.
Fig. 1 is a schematic structural diagram of an optical system with a long focal length and a large aperture depth of field according to an embodiment of the present application;
fig. 2 is an optical structure schematic diagram of an optical system with a long focal length and a large aperture depth of field according to an embodiment of the present application;
fig. 3 is an MTF curve of an optical system with a long focal length and a large aperture depth of field according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by the person skilled in the art based on the present application are included in the scope of protection of the present application.
In order to more clearly describe the optical system with the long-focus large aperture and wide depth of field provided by the embodiment of the present application, an exemplary description will be given below of one possible application scenario of the optical system with the long-focus large aperture and wide depth of field provided by the embodiment of the present application, and the following examples are only one possible application scenario of the optical system with the long-focus large aperture and wide depth of field provided by the embodiment of the present application, and in other possible embodiments, the optical system with the long-focus large aperture and wide depth of field provided by the embodiment of the present application may also be applied to other possible application scenarios, and the following examples do not limit any limitation.
Because the longer the focal length is, the higher the magnification is, so that the consideration of shooting detail images is that some monitoring cameras adopt a long-focus lens, but because the aperture of the long-focus lens is enlarged after the aperture is enlarged, the larger the aberration is, the more difficult the imaging quality of the peripheral view field is ensured, the aperture of the long-focus lens is often smaller, such as FNO1.8 and FNO1.6, so that the overall picture brightness of the image shot by the lens is lower and the image effect is poorer in a low-illumination environment.
In addition, the depth of field of the long-focus lens is often smaller, and when the monitoring equipment is installed, a depression angle is often formed between the lens and the monitored environment, so that distances between all spatial points in the monitored environment and the lens are inconsistent, namely, part of spatial points in the monitored environment are located in close range of a shot monitoring image, part of spatial points are located in distant range of the shot monitoring image, and for the lens with a small depth of field, the conditions of clear focusing position image, and blurred close range image and distant range image in the image can occur.
Therefore, a lens with a long focal length and a large aperture expansion depth of field is needed to solve the above technical problems. Based on this, the embodiment of the application provides an optical system with long focal length and large aperture expansion depth, as shown in fig. 1, a first lens group and a second lens group are sequentially arranged from an object direction image side in the optical system;
the optical axes of the lenses in the second lens group are overlapped;
the first lens group comprises a first lens, the first lens is a free-form surface lens, and the optical axis of the first lens deflects relative to the optical axis of the second lens group;
the focal length of the lens is larger than a preset focal length threshold, and the difference degree between the focal length of the second lens group and the focal length of the optical system is smaller than the preset difference threshold.
By selecting the embodiment, the optical path difference caused by the nonparallel object plane and image plane can be corrected through the first lens group arranged in front of the image plane and the free-form surface lens deflected in the first lens group, and the problem of virtual focus of far and near vision during lens installation is solved, so that an optical system with long focus and large aperture depth of field is realized.
Wherein, the object direction refers to a direction approaching the object, and the image direction refers to a direction approaching the image plane. The second lens group and the first lens group are both positioned on the object direction of the image plane. One or more lenses are included in the second lens group and the first lens group, and a spherical lens may be included in the first lens group in addition to the free-form surface lens. The amount of deflection of the free-form surface lens with respect to the optical axis of each lens in the second lens group may be different depending on the application scene, and the amount of deflection of different lenses in the first lens group may be different.
The preset focus threshold may be set according to user requirements or practical experience, for example, in one possible embodiment, the preset focus threshold is 100. Similarly, the magnitude of the difference threshold may be set according to the requirement of the user or the actual experience, and the difference threshold may be a fixed value or may be determined according to the focal length of the optical system, and in an exemplary embodiment, the difference threshold is 10% of the focal length of the optical system, and for convenience of description, the focal length of the optical system is denoted as F, and before the focal length of the second lens group is denoted as F, 0.9< before F/F <1.1.
The constitution of the first lens group will be described below:
the first lens group at least comprises a first lens;
the first lens is arranged at the position closest to the object in the first lens group
The first lens is a free-form surface lens, the optical axis of the first lens is offset relative to the optical axis of the second lens group, and the value range of the offset is [0 degrees, 25 degrees ].
In this embodiment, since the optical axis of the first lens element has a certain inclination angle with respect to the optical axis of the second lens element, the inclination angle of the object plane with respect to the image plane can be compensated. Therefore, the optical path difference is caused by the fact that the correction object plane is not parallel to the image plane, so that the optical path difference of light emitted by each point on the object plane to reach the image plane is similar or even the same.
In one possible embodiment, the first lens group further comprises a second lens;
the second lens is arranged at the position closest to the object side in the second lens group;
the focal length of the second lens is negative, the image surface and the object surface of the second lens are concave spherical surfaces, the optical axis of the second lens is offset relative to the optical axis of the first lens group, and the value range of the offset is [ -10 degrees, 10 degrees ].
In this embodiment, the second lens is additionally disposed on the basis of the first lens, and since a certain inclination angle exists between the optical axis of the second lens and the optical axis of the second lens group, the inclination angle of the object plane with respect to the image plane can be further compensated.
Meanwhile, the second lens is a biconcave spherical lens with a negative focal length, so that light rays can be converged, and the caliber of the front section of the optical system is reduced.
In one possible embodiment, the first lens group further includes a third lens;
the third lens is arranged on the image side of the second lens;
the focal length of the third lens is positive, and the image plane and the object plane of the third lens are convex spherical surfaces;
the focal length of the third lens has a value range of (|F) 2 |，2*|F 2 I), wherein F 2 Is the focal length of the second lens. I.e. if the focal length of the third lens is denoted as F 3 Then 1 < |F 3 /F 2 The level is less than 2. The optical axis of the third lens is offset relative to the optical axis of the first lens group, and the value range of the offset is [ -10 degrees, 10 degrees.)]。
In this embodiment, the third lens is additionally disposed on the basis of the first lens and the second lens, and since a certain inclination angle exists between the optical axis of the third lens and the optical axis of the second lens group, the inclination angle of the object plane and the image plane can be further compensated, so that the optical path difference caused by the non-parallel object plane and the image plane can be better corrected.
And moreover, the third lens and the second lens are matched with each other, so that the spherical aberration of the optical lens can be effectively reduced, and the quality of a shot image is improved. The third lens and the second lens may be two lenses independent of each other or may be lenses bonded together, and in one possible embodiment, the third lens and the second lens are bonded together by uv.
In one possible embodiment, the first lens group further comprises a fourth lens;
the fourth lens is arranged on the image side of the third lens;
the focal length of the fourth lens is positive, the object plane of the fourth lens is a convex spherical surface, and the curvature radius of the object plane of the fourth lens is smaller than the curve radius of the image plane of the fourth lens; namely, 0 < L4R1/L4R2 <1, wherein L4R1 is the curvature radius of the object plane of the fourth lens, and L4R2 is the curvature radius of the image plane of the fourth lens.
In this embodiment, the fourth lens is additionally disposed on the basis of the first lens, the second lens and the third lens, and since a certain inclination angle exists between the optical axis of the fourth lens and the optical axis of the second lens group, the inclination angle of the object plane relative to the image plane can be further compensated, so that the optical path difference caused by non-parallel object plane and image plane can be better corrected.
The constitution of the second lens group will be described below:
in one possible embodiment, the second lens group includes a fifth lens;
the fifth lens is arranged at the position closest to the object side in the second lens group, namely other lenses in the second lens group are positioned at the image side of the fifth lens;
the fifth lens focal length is positive, and the object plane of the first lens is a convex spherical surface.
In this embodiment, since the focal length of the fifth lens is positive and the object plane is concave, light can be better converged, and meanwhile, since the fifth lens is located at the position closest to the object side in the second lens group, the converged light of the fifth lens can make the cross section of light incident to other lenses in the second lens group smaller, so that the aperture of the front section of the lens is reduced, and the total length of the optical system is reduced.
In one possible embodiment, the second lens group further includes: a sixth lens and a seventh lens;
the sixth lens is arranged on the image side of the fifth lens, and the seventh lens is arranged on the image side of the sixth lens;
the focal length of the sixth lens is negative, and the sixth lens is a meniscus lens or a plano-concave lens;
the focal length of the seventh lens is positive, the object plane of the fifth lens is a convex spherical surface, and the object plane of the sixth lens is adhered to the image plane of the sixth lens.
In this embodiment, the sixth lens and the seventh lens are mutually matched, so that chromatic aberration of the optical system can be effectively reduced, and image quality of a field edge in a captured image can be improved. Meanwhile, the sixth lens is adhered with the seventh lens, so that the sensitivity of the optical system to tolerance can be reduced, and the assembly difficulty of the optical system is reduced.
In one possible embodiment, the second lens group further includes: an eighth lens and a ninth lens;
the eighth lens is arranged on the image side of the sixth lens, and the ninth lens is arranged on the image side of the eighth lens;
the focal length of the eighth lens is positive, and the object plane and the image plane of the eighth lens are convex spherical surfaces;
the focal length of the ninth lens is negative, the object plane and the image plane of the ninth lens are concave spherical surfaces, and the object plane of the eighth lens is adhered to the image plane of the eighth lens.
In this embodiment, by the interaction between the eighth lens and the ninth lens, chromatic aberration of light incident on the eighth lens and the ninth lens can be reduced, and quality of a captured image can be improved. And the tolerance sensitivity of the lens can be reduced by bonding the eighth lens and the ninth lens, so that the assembly difficulty of the lens is reduced.
The magnitude relation between the refractive index of the eighth lens and the refractive index of the ninth lens, which is opposite to the magnitude relation before the abbe number of the eighth lens and the abbe number of the ninth lens, means: the abbe number of the eighth lens is smaller than the abbe number of the ninth lens if the refractive index of the eighth lens is larger than the refractive index of the ninth lens, and the abbe number of the eighth lens is larger than the abbe number of the ninth lens if the refractive index of the eighth lens is smaller than the refractive index of the ninth lens.
For convenience of description, the refractive index of the eighth lens is denoted as nd8, the abbe number of the eighth lens is denoted as vd8, the refractive index of the ninth lens is denoted as nd9, and the abbe number of the ninth lens is denoted as vd9, it should be satisfied that: (nd 8-nd 9)/(vd 8-vd 9) < 0.
In some application scenarios, the lens may need to work at a high temperature or a low temperature, and therefore the lens is required to have a higher high-low temperature performance, in these application scenarios, the temperature coefficient of the material of the ninth lens is greater than a preset coefficient threshold, where the temperature coefficient in the present application refers to a rate at which the optical performance of the lens changes with temperature change, and since the optical performance of the lens decreases with temperature increase, that is, the rate is a negative value, the rate at which the optical performance of the material with a higher temperature coefficient changes with temperature change is slower.
In one possible embodiment, the second lens group further includes: a tenth lens;
the tenth lens is arranged on the image side of the eighth lens, the focal length of the tenth lens is positive, and the object plane and the image plane of the tenth lens are convex spherical surfaces;
the temperature coefficient of the material of the tenth lens is larger than a preset coefficient threshold.
In this embodiment, by setting the tenth lens and selecting a material with a larger temperature coefficient for the tenth lens, the high-low temperature performance of the lens is further improved, so that the lens can better work in a high-temperature and low-temperature scene.
Depending on the application scenario, the preset coefficient threshold may be different, and in one possible embodiment, the coefficient threshold is-1×10 -6 I.e. the temperature coefficient D0 (10) of the tenth lens should satisfy-1 x 10 -6 ＜D0(10)＜0。
In one possible embodiment, the tenth lens may be independent of the ninth lens, and in another possible embodiment, an object plane of the tenth lens is adhered to an image plane of the ninth lens.
In the embodiment, since the tenth lens is adhered to the ninth lens, the assembly tolerance sensitivity of the tenth lens can be reduced, thereby further reducing the assembly difficulty of the optical system.
In one possible embodiment, the second lens group further includes an eleventh lens;
the eleventh lens is arranged on the image side of the tenth lens;
the focal length of the eleventh lens is positive, and the object plane of the eleventh lens is a convex spherical surface;
the range of the curvature radius of the object plane of the eleventh lens is (0.5×l11r2,1.5×l11r2), where L11R2 is the curvature radius of the image plane of the eleventh lens;
the distance between the tenth lens and the image plane is larger than a preset distance threshold.
In this embodiment, through the mirror surface of rational design eleventh lens for eleventh lens can possess stronger ability of gathering light, consequently can make the light that passes through eleventh lens focus more fast and image on great photosurface, effectively shortened the total length of camera lens, can realize big target surface simultaneously.
In one possible embodiment, the second lens group further includes a twelfth lens;
the twelfth lens is arranged on the image side of the eleventh lens;
the twelfth lens is a planar lens and is provided with a coating film for filtering non-visible light.
The plane lens means that the object plane and the image plane of the twelfth lens are planes perpendicular to the optical axis of the second lens group. The material and thickness of the coating film of the twelfth lens may be different according to the application scene, but the coating film should have the effect of filtering non-visible light and should allow visible light to pass through.
In this embodiment, since the twelfth lens is provided with a film capable of filtering non-visible light, the non-visible light, such as near infrared light, far infrared light, and the like, in the light beam cannot reach the photosensitive surface of the sensor through the twelfth lens, so that aberration caused by the non-visible light can be effectively avoided, and the quality of the captured image is further improved.
In one possible embodiment, the material of each lens in the second lens group is glass, and in this embodiment, the second lens group is constructed by using a glass lens, so that on one hand, the cost of the first lens group can be effectively reduced, and on the other hand, the rate of change of the optical performance of the glass along with the change of temperature is lower because the temperature coefficient of the glass is relatively larger, so that the stability of the lens can be improved by using the glass material.
In the following, an exemplary description will be given of an example in which the first lens group includes the aforementioned first lens to fourth lens, the second lens group includes the aforementioned fifth lens and twelfth lens, and a stop is provided between the fifth lens and sixth lens.
In this example, the optical system should satisfy:
0.05＜D/H/FOV＜0.5；(FOV*F)/H＞50；0＜BFL/TTL＜0.15；1.5＜TTL/F＜3。
wherein D is the front section caliber of the lens, H is the pixel height corresponding to the maximum field angle, and FOV is the maximum field angle. TTL is the total length of the lens, and BFL is the optical back focus of the lens.
In one possible embodiment, the overall focal length f= 49.33mm of the optical system, the F-number fno=1.0, the field angle fov=15° will be exemplarily described below in connection with the second lens group and the first lens group.
Table 1 shows specific parameters of one embodiment of the optical system of the present application:
TABLE 1
Wherein the plane number of one mirror is the order of the mirror in the order from the object side to the image side, for example, the plane number of the object plane of the first lens is 1, the plane number of the image plane of the first lens is 2, the plane number of the object plane of the second lens is 3, the plane number of the image plane of the second lens is 4, and so on.
The mirror shape of the first lens is defined by the following formula:
wherein z is the sagittal height parallel to the optical axis, C is the curvature, k is the conic coefficient, C j Is x m y n Is a coefficient of (a). The coefficients are shown in table 2 below:
TABLE 2
From the above data, the formula values involved in this embodiment are calculated as follows:
|F1|＝5128，F3/F2|＝1.59，F2＝-52.2，F3＝83.4，L4R1/L4R2＝0.38，(nd8-nd9)/(vd8-vd9)＝0.003，D0(10)＝-1.07E-5<0，L11R1/L11R2＝1.03，T21+T23＝16.8mm，<D/H/FOV＝0.27，(FOV×F)/H＝57.8，BFL/TTL＝0.1，TTL/F＝3.3，F rear part (S) /F＝1.0。
Wherein F1 is a focal length of the first lens, F2 is a focal length of the second lens, F3 is a focal length of the third lens, L11R1 is a radius of curvature of an object plane of the eleventh lens, L11R2 is a radius of curvature of an image plane of the eleventh lens, and t21+t23 is a distance between the eleventh lens and the image plane.
As shown in table 1, as a specific set of example parameters, optical lenses employing these parameters can achieve better optical performance. In this example, the structure of the optical system is shown in fig. 2. The MTF curve of the optical system is shown in fig. 3.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.
Claims (8)
1. An optical system with a long focus and a large aperture expansion depth of field is characterized in that a first lens group and a second lens group are sequentially arranged from an object direction image side in the optical system;
the optical axes of the lenses in the second lens group are overlapped;
the first lens group comprises a first lens, the first lens is a free-form surface lens, and the optical axis of the first lens deflects relative to the optical axis of the second lens group;
the focal length of each lens is larger than a preset focal length threshold, and the degree of difference between the focal length of the second lens group and the focal length of the optical system is smaller than a preset difference threshold;
the first lens group further comprises a second lens;
the second lens is arranged on the image side of the first lens;
the focal length of the second lens is negative, and the image surface and the object surface of the second lens are concave spherical surfaces;
the first lens group further comprises a third lens;
the third lens is arranged on the image side of the second lens;
the focal length of the third lens is positive, and the image plane and the object plane of the third lens are convex spherical surfaces;
the focal length of the third lens has a value range of (|F) 2 |，2*|F 2 I), wherein F 2 Is the focal length of the second lens.
2. The optical system of claim 1, wherein the preset focal length threshold is 100mm and the difference threshold is 10% of the focal length of the optical system.
3. The optical system of claim 1, wherein the first lens group further comprises: a fourth lens;
the fourth lens is arranged on the image side of the third lens;
the focal length of the fourth lens is positive, the object plane of the fourth lens is a convex spherical surface, and the curvature radius of the object plane of the fourth lens is smaller than the curve radius of the image plane of the fourth lens.
4. The optical system of claim 1, wherein the second lens group comprises: a fifth lens;
the fifth lens is arranged at the position closest to the object side in the second lens group;
and the focal length of the fifth lens is positive, and the object plane of the fifth lens is a convex spherical surface.
5. The optical system of claim 4, wherein the second lens group further comprises: a sixth lens and a seventh lens;
the sixth lens is arranged on the image side of the fifth lens, and the seventh lens is arranged on the image side of the sixth lens;
the focal length of the sixth lens is negative, and the sixth lens is a meniscus lens or a plano-concave lens;
the focal length of the seventh lens is positive, and the object plane of the seventh lens is a convex spherical surface, and the object plane of the seventh lens is adhered to the image plane of the sixth lens.
6. The optical system of claim 5, wherein the second lens group further comprises: an eighth lens and a ninth lens;
the eighth lens is arranged on the image side of the sixth lens, and the ninth lens is arranged on the image side of the eighth lens;
the focal length of the eighth lens is positive, and the object plane and the image plane of the eighth lens are convex spherical surfaces;
the focal length of the ninth lens is negative, the object plane and the image plane of the ninth lens are concave spherical surfaces, and the object plane of the ninth lens is adhered to the image plane of the eighth lens;
a magnitude relation between a refractive index of the eighth lens and an abbe number of the ninth lens is opposite to a magnitude relation between an abbe number of the eighth lens and an abbe number of the ninth lens.
7. The optical system of claim 6, wherein the second lens group further comprises: a tenth lens;
the tenth lens is arranged on the image side of the ninth lens, the focal length of the tenth lens is positive, and the object plane and the image plane of the tenth lens are convex spherical surfaces;
the temperature coefficient of the material of the tenth lens is larger than a preset coefficient threshold.
8. The optical system of claim 7, wherein an object plane of the tenth lens is bonded to an image plane of the ninth lens.
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| CN114647071A (en) | 2022-06-21 |
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