CN110133827B - Super wide-angle lens - Google Patents
Super wide-angle lens Download PDFInfo
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- CN110133827B CN110133827B CN201910351593.9A CN201910351593A CN110133827B CN 110133827 B CN110133827 B CN 110133827B CN 201910351593 A CN201910351593 A CN 201910351593A CN 110133827 B CN110133827 B CN 110133827B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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Abstract
The application discloses super wide angle camera lens includes the battery of lens that constitutes by the glass material, and from the thing side to the imaging surface, the battery of lens includes in proper order: the first lens with negative focal power is a meniscus spherical lens with a concave surface facing an imaging surface; the second lens is a meniscus spherical lens; the third lens is a meniscus spherical lens, and the concave surface faces the object side; the fourth lens is a biconvex aspheric lens; the fifth lens is a biconvex spherical lens; the sixth lens is a concave spherical lens; the seventh lens is a biconvex spherical lens; and the eighth lens is a biconvex aspheric lens. The all-glass lens has the advantages of long service life, high stability and capability of effectively reducing the processing difficulty and the manufacturing cost of the lens.
Description
Technical Field
The present disclosure relates to a lens, and more particularly, to an ultra-wide angle lens.
Background
With the continuous improvement of the market environment on the requirements of the ultra-wide-angle lens, the ultra-wide-angle high-definition photographic lens is also more and more diversified.
In order to meet the use requirements of all the photography enthusiasts, such as outdoor travel shooting, diving exploration shooting, house building interior shooting, meeting record camera lens, monitoring camera lens and the like, the high-quality wide-angle lens capable of well correcting high-order aberration is urgently needed to be developed.
Disclosure of Invention
The application provides an ultra-wide angle lens to improve the defects.
In a first aspect, an embodiment of the present application provides an ultra-wide angle lens, including a stop and a lens assembly made of a glass material, where the lens assembly includes, in order from an object side to an image plane: a first lens with negative focal power, wherein the first lens is a meniscus spherical lens with a concave surface facing the imaging surface; a second lens with negative focal power, wherein the second lens is a meniscus spherical lens or a meniscus aspheric lens with a concave surface facing the imaging surface; a third lens with negative focal power, wherein the third lens is a meniscus spherical lens, and the concave surface faces the object side; a fourth lens with positive focal power, wherein the fourth lens is a biconvex aspheric lens, a meniscus aspheric lens or a biconvex spherical lens; the fifth lens is a biconvex spherical lens or a meniscus spherical lens, and the concave surface of the fifth lens faces the imaging surface; the sixth lens is a concave spherical lens and has negative focal power; a seventh lens with positive focal power, wherein the seventh lens is a biconvex spherical lens; an eighth lens with positive focal power, wherein the eighth lens is a biconvex aspheric lens; the diaphragm is arranged between the fourth lens and the fifth lens.
Further, the third lens includes: the first sub-lens is a biconcave spherical lens; and the second sub lens is a spherical lens with a convex surface facing the imaging surface, and the first sub lens and the second sub lens are cemented into the third lens.
Further, if the second lens element is a meniscus spherical lens element, the fourth lens element is a biconvex aspheric lens element or a meniscus aspheric lens element, and the fifth lens element is a biconvex spherical lens element.
Further, if the second lens element is a meniscus aspheric lens element, the fourth lens element is a biconvex spherical lens element, and the fifth lens element is a meniscus spherical lens element with a concave surface facing the image plane.
Further, the ultra-wide-angle lens satisfies the relation:
6＜TL/(h/2)＜9；
wherein, TLThe total optical length of the whole super-wide-angle lens is shown, and h represents the image surface height.
Further, the ultra-wide-angle lens satisfies the relation:
wherein the content of the first and second substances,
the power of the first lens is indicated,
the power of the entire ultra-wide angle lens is expressed.
Further, the ultra-wide-angle lens satisfies the relation:
wherein the content of the first and second substances,
represents the power of the entire ultra-wide angle lens,
representing the power of each lens combination between the object side and the diaphragm,
the power of each lens combination between the diaphragm and the imaging plane is indicated.
Further, the ultra-wide-angle lens satisfies the relation:
70＜V8＜91；
40＜V8-V1＜70；
wherein, V8Abbe number, V, of the fifth lens1The abbe number of the first lens is shown.
Further, the ultra-wide-angle lens satisfies the relation:
0.5＜(R2F-R2B)/R2F＜0.9；
-0.9＜R8B/(R8F-R8B)＜-0.6；
wherein R is2FDenotes the radius of curvature, R, of the object-side vertex of the second lens2BDenotes the radius of curvature of the vertex of the image-side surface of the second lens, R8FDenotes the object-side vertex radius of curvature, R, of the eighth lens8BThe eighth lens image side vertex radius of curvature is shown.
Further, the ultra-wide-angle lens satisfies the relation:
0.9＜Δh100/Δh0＜1.1；
wherein,. DELTA.h0Denotes the imaging size at a field angle of 0 DEG to 1 DEG, Δ h100Representing the imaging size at 99 deg. to 100 deg. field angles.
Compared with the prior art, the ultra-wide-angle lens provided by the application adopts the all-glass lens, so that the service life and the stability are higher, and the processing difficulty and the manufacturing cost of the lens are effectively reduced; the all-glass lens can effectively correct the aberration of the lens, has the advantage of small focus drift amount generated by high and low temperature, can adapt to different temperature occasions, and has good temperature control; by adopting all-glass lenses and reasonably matching the focal power combination of each lens, the ultra-large field angle of more than 200 degrees can be achieved, the day and night confocal effect is achieved, and images with high imaging quality can be shot in the day and at night.
Additional features and advantages of embodiments of the present application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of embodiments of the present application. The objectives and other advantages of the embodiments of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an ultra-wide angle lens provided in embodiment 1 of the present invention;
fig. 2 is a field curvature graph of the ultra-wide angle lens provided in embodiment 1 of the present invention;
fig. 3 is a distortion graph of the ultra-wide angle lens provided in embodiment 1 of the present invention;
fig. 4 is an MTF curve of the ultra-wide angle lens provided in embodiment 1 of the present invention in the visible spectrum;
fig. 5 is a schematic structural diagram of an ultra-wide angle lens provided in embodiment 2 of the present invention;
fig. 6 is a field curvature graph of the ultra-wide angle lens provided in embodiment 2 of the present invention;
fig. 7 is a distortion graph of the ultra-wide angle lens provided in embodiment 2 of the present invention;
fig. 8 is an MTF curve of the ultra-wide angle lens provided in embodiment 2 of the present invention in the visible spectrum;
fig. 9 is a schematic structural view of an ultra-wide angle lens provided in embodiment 3 of the present invention;
fig. 10 is a field curvature graph of the ultra-wide angle lens provided in embodiment 3 of the present invention;
fig. 11 is a distortion graph of the ultra-wide angle lens provided in embodiment 3 of the present invention;
fig. 12 is an MTF curve of the ultra-wide angle lens provided in embodiment 3 of the present invention in the visible spectrum.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
With the continuous improvement of the market environment on the requirements of the ultra-wide-angle lens, the ultra-wide-angle high-definition photographic lens is also more and more diversified. Currently used super wide-angle lens
The defects of total growth, small visual angle, poor temperature control, low resolution quality, high cost, no confocal phenomenon day and night and the like exist all the time, and the use requirement cannot be met.
In order to meet the use requirements of all the photography enthusiasts, such as outdoor travel shooting, diving exploration shooting, house building interior shooting, meeting record camera lens, monitoring camera lens and the like, the high-quality wide-angle lens capable of well correcting high-order aberration is urgently needed to be developed.
Example 1
Referring to fig. 1, the super wide-angle lens provided in this embodiment of the present application includes, in order from an object side to an image plane, a first lens 11 with negative focal power, a second lens 12 with negative focal power, a third lens 13 with negative focal power, a fourth lens 14 with positive focal power, a stop 20, a fifth lens 15 with positive focal power, a sixth lens 16 with negative focal power, a seventh lens 17 with positive focal power, an eighth lens 18 with positive focal power, an optical filter 30, and a cover glass 40.
Wherein, first lens 11 is the meniscus lens of concave surface orientation imaging surface, the second passes through 12 and is the meniscus lens or the meniscus aspheric lens of concave surface orientation imaging surface, third lens 13 is meniscus spherical lens, and the concave surface orientation the object side, fourth lens 14 is biconvex type aspheric lens, meniscus aspheric lens or biconvex type spherical lens, diaphragm 20 is the light filtering paper that the center was equipped with logical unthreaded hole, fifth lens 15 is biconvex type spherical lens or meniscus spherical lens, and the concave surface orientation the imaging surface, sixth lens 16 is concave type spherical lens, seventh lens 17 is biconvex type spherical lens, sixth lens 16 with seventh lens 17 constitutes the veneer lens, eighth lens 18 is the biconvex type aspheric lens. The optical filter 30 is any one of a visible light filter and an infrared light filter, and when the visible light filter is selected, the thickness is 0.3mm, and when the infrared light filter is selected, the thickness is 0.21mm, and specifically, an infrared light 850nm optical filter can be selected. It should be understood that, in the present embodiment, the filter with a thickness of 0.3mm is taken as an example, but it should be understood that the thickness of the filter 30 is not limited thereto, and the thicknesses of the visible light filter and the infrared light filter may be the same or different.
The third lens 13 may be formed by combining two lenses or may be integrally formed. Specifically, in the embodiment of the present application, the third lens 13 is formed by gluing the first sub-lens 131 and the second sub-lens 132. The first sub-lens 131 has negative power and is a biconcave spherical lens. The second sub-lens 132 has positive focal power and is a spherical lens with a convex surface facing the image plane, and the first sub-lens 131 and the second sub-lens 132 are cemented into the third lens 13. And will be described in the subsequent embodiments with respect to the integrally formed third lens.
In addition, the second lens element 12 may be a meniscus type aspheric lens or a meniscus type aspheric lens with the concave surface facing the image plane, the fourth lens element 14 may be a biconvex type aspheric lens, a meniscus type aspheric lens or a biconvex type spherical lens, and the fifth lens element 15 may be a biconvex type spherical lens or a meniscus type spherical lens with the concave surface facing the image plane. In the case where the first lens 11, the third lens 13, the sixth lens 16, the seventh lens 17, and the eighth lens 18 maintain the above-described embodiment, the selection manner of the second lens 12, the fourth lens 14, and the fifth lens 15 is different, so that the ultra-wide angle lens may have various combinations:
first, if the second lens element 12 is a meniscus spherical lens element, the fourth lens element 14 is a biconvex aspheric lens element, and the fifth lens element 15 is a biconvex spherical lens element;
secondly, if the second lens element 12 is a meniscus spherical lens element, the fourth lens element 14 is a meniscus aspheric lens element, and the fifth lens element 15 is a biconvex spherical lens element;
and a third lens element, wherein the second lens element is a meniscus aspheric lens element, the fourth lens element is a biconvex spherical lens element, and the fifth lens element is a meniscus spherical lens element with a concave surface facing the image plane.
In the embodiment of the present application, the second lens element 12 is a meniscus spherical lens element, the fourth lens element 14 is a biconvex aspheric lens element, the fifth lens element 15 is a biconvex spherical lens element, and the second and third combinations will be described in the following embodiments. In the embodiment of the present application, the first lens element 11, the second lens element 12, the third lens element 13, the fifth lens element 15, the sixth lens element 17 and the seventh lens element 18 are glass spherical lens elements, the fourth lens element 16 and the eighth lens element 20 are glass aspherical lens elements, and the optical centers of the respective lens elements are located on the same straight line, and a multilayer film with high transmittance is plated on each lens element of the super-wide angle lens. Meanwhile, the front and the back of the diaphragm of the ultra-wide-angle lens and three positions close to the image surface are respectively made of a piece of low-dispersion glass material.
Note that the diaphragm 20 functions to precisely adjust the amount of light passing. In order to take a clear picture in a dark scene, a larger luminous flux lens is needed, and a diaphragm is arranged at the position, so that the control of the incidence angle of the principal ray reaching an image plane is facilitated, the incidence angle can be effectively controlled within 5 +/-3 degrees, and the incidence requirement of a chip is better met. Meanwhile, the diaphragm 20 adopts the masking paper with the center provided with the light through hole, and the masking paper is used as the diaphragm, so that the requirement on the light through hole of the lens barrel is reduced, the processing accuracy is ensured to the maximum extent, the processing error is reduced, and the adjustment is convenient.
In addition, it should be noted that, by providing one of a visible light filter and an infrared light filter at the rear side of the eighth lens element 18, visible light and infrared light are respectively in the daytime and nighttime working bands, and the transmission of light in the non-working band is suppressed by the filter, so that chromatic aberration and stray light of the optical system can be effectively reduced, and the imaging effect is improved.
Wherein, for the total length of restriction camera lens to ensure that the camera lens has good enough image quality, super wide-angle camera lens 1 satisfies the relational expression:
6＜TL/(h/2)＜9；
wherein, TLThe total optical length of the whole super-wide-angle lens is shown, and h represents the image surface height. When T isLIf the value of h/2 exceeds the upper limit, the overall length of the lens is too long, or if the overall length is shortened, the image height is insufficient; when the value of TL/(h/2) exceeds the lower limit, the lens aberration is difficult to correct because the focal power of each lens is too large, and the resolving power is significantly reduced.
Wherein, for providing a suitable lens size while correcting aberrations well, the ultra-wide angle lens 1 satisfies the relation:
wherein the content of the first and second substances,
the power of the first lens 11 is shown,
the power of the entire ultra-wide angle lens 1 is shown.
When in use
When the value of (b) exceeds the upper limit, the focal power of the first lens 11 is too strong, and although the purpose of quickly collecting light can be achieved, the total length of the system becomes small, astigmatism, field curvature and distortion generated by the focal power are too large to be corrected, and meanwhile, the curvature radius of the first lens 11 is reduced, so that the processing difficulty is improved, and the system error is increased; when in use
When the value of (D) exceeds the lower limit, the power of the first lens 11 is reduced, and the above various aberration phases are formedThe decrease in power, however, results in a lengthening of the system.
Wherein, for providing a suitable lens size while correcting aberrations well, the ultra-wide angle lens 1 satisfies the relation:
wherein the content of the first and second substances,
represents the power of the entire ultra-wide angle lens,
the focal power of the entire lenses between the object side and the diaphragm, i.e. the combined focal power of the first lens 11, the second lens 12, the third lens 13 and the fourth lens 14, and the front lens group of the super-wide-angle lens formed by the first four lenses, effectively converge the object plane light with wide field angle into the lens, and no large aberration is generated. When in use
When the value of (b) exceeds the upper limit, the combined optical focus of the front lens group is too strong, and although the total length of the system can be reduced, the generated spherical aberration is too large and is difficult to correct; when in use
When the value of (b) exceeds the lower limit, the power of the front lens group decreases, the spherical aberration relatively decreases, but the optical power thereof decreases, resulting in lengthening of the total length of the system.
Wherein, for providing a suitable lens size while correcting aberrations well, the ultra-wide angle lens 1 satisfies the relation:
wherein the content of the first and second substances,
represents the power of the entire ultra-wide angle lens,
the optical power of each lens combination between the diaphragm and the imaging surface, that is, the combined optical power of the fifth lens 15, the sixth lens 16, the seventh lens 17, and the eighth lens 18 is shown. The rear four lenses form a rear lens group of the ultra-wide-angle lens, and the combined focal power of the rear lens group corresponds to the front lens group, so that the rear lens group is effectively matched with the front lens group, and aberration is reasonably removed. When in use
When the value of (b) exceeds the upper limit, the optical focus of the rear lens group is too strong, so that the total length of the system can be reduced, but the generated spherical aberration, astigmatism and field curvature are too large, so that the correction is difficult; when in use
When the value of (b) exceeds the lower limit, the power of the rear lens group decreases, and the aberration described above relatively decreases, but the power thereof decreases, resulting in lengthening of the system.
Wherein, in order to guarantee the reasonable collocation of material, compromise simultaneously and rectify chromatic aberration, high low temperature change back burnt stability, ultra wide angle lens 1 satisfies the relational expression:
70＜V8＜91；
40＜V8-V1＜70；
wherein, V8Expressing Abbe number, i.e. V, of the fifth lens8Representing Abbe number, V, of the last lens in a super wide-angle lens1The abbe number of the first lens is shown. When V is8-V1When the value of (b) exceeds the lower limit, the chromatic aberration is insufficiently corrected; when V is8-V1If the value of (b) exceeds the upper limit, the material selection becomes difficult.
Wherein, for correcting field curvature and distortion, ultra wide angle lens 1 satisfies the relational expression:
0.5＜(R2F-R2B)/R2F＜0.9；
-0.9＜R8B/(R8F-R8B)＜-0.6；
wherein R is2FDenotes the radius of curvature, R, of the object-side vertex of the second lens 122BDenotes the radius of curvature, R, of the image-side vertex of the second lens element 128FDenotes the object-side vertex radius of curvature, R, of the eighth lens element 188BThe radius of curvature of the image-side vertex of the eighth lens element 18 is shown. The above relation defines the shape of the second lens 12 and the last lens, i.e. the eighth lens 18. When the above value exceeds the upper limit, the lens distortion is reduced, but the curvature of field is difficult to correct; when the above value exceeds the lower limit, the lens curvature is reduced, but distortion correction is difficult.
Further, the ultra-wide angle lens 1 satisfies the relation:
0.9＜Δh100/Δh0＜1.1；
wherein,. DELTA.h0Denotes the imaging size at a field angle of 0 DEG to 1 DEG, Δ h100Representing the imaging size at 99 deg. to 100 deg. field angles.
The relation is satisfied, the image height ratio of the central view field unit angle and the edge view field unit angle of the lens can reach 0.9-1.1, so that the lens has an ideal imaging ratio, and the high-resolution and high-definition image quality of the lens can be better embodied than that of an equivalent resolution horizontal lens.
Further, the surface shapes of the aspherical mirrors of the ultra-wide angle lens 1 may all satisfy the following equation:
wherein z is the distance between the curved surface and the vertex of the curved surface in the optical axis direction, c is the curvature of the vertex of the curved surface, K is the coefficient of a quadric surface, h is the distance between the optical axis and the curved surface, and B, C, D and E are the coefficients of a fourth order, a sixth order, an eighth order and a tenth order curved surface respectively.
In all embodiments provided subsequently in the present invention, the cross-sectional structure of the super-wide-angle lens can be seen from fig. 1, and in the following embodiments, the thickness, the curvature radius, and the material selection portion of each lens in the super-wide-angle lens are different, and the specific differences can be seen in the parameter tables of the embodiments.
Please refer to table 1, which shows the design parameters of each lens in this embodiment.
TABLE 1a
TABLE 1b
Referring to fig. 2 and 3, it can be seen that the field curvature and distortion of the super-wide-angle lens of the present embodiment are well corrected. Please refer to fig. 4, which shows the MTF curve of the super-wide-angle lens of the present embodiment, it can be seen that the lens of the present embodiment has good resolution and resolution.
In summary, compared with the prior art, the ultra-wide-angle lens in the above embodiments of the present application has the following advantages:
(1) the ultra-wide-angle lens in the embodiment of the application adopts eight glass spherical lenses, so that the service life and the stability are higher, and the processing difficulty and the manufacturing cost of the lens are effectively reduced;
(2) the lens in the embodiment of the application uses the all-glass spherical lens, so that the aberration of the lens is effectively corrected, the lens has the advantages of small focus drift amount generated by high and low temperature, can adapt to different temperature occasions, and has good temperature control;
(3) the lens in the embodiment of the application adopts eight full-glass spherical lenses, and by reasonably matching the focal power combination of each lens, an ultra-large field angle of more than 220 degrees can be achieved, a day and night confocal effect is achieved, and images with high imaging quality can be shot in the day and at night;
(4) in the ultra-wide-angle lens in the embodiment of the application, one of a visible light filter and an infrared light filter is arranged behind the eighth lens, so that the advantage of unfocused surface drift of visible light and near infrared light is achieved;
(5) the ultra-wide-angle lens in the embodiment of the application has the advantages of small distortion and small imaging deformation of the edge field, and the image height ratio of the unit angle of the central field to the unit angle of the edge field can reach 1.4-2;
(6) the low-dispersion glass material is adopted, so that the chromatic aberration of the lens is effectively reduced, and the purple edge phenomenon is reduced to the greatest extent.
Example 2
Referring to fig. 5, a schematic diagram of an ultra-wide angle lens structure according to a second embodiment of the present application is shown, where the lens structure in this embodiment is substantially the same as that in the first embodiment, except that: (1) the fifth lens 15 is a meniscus glass aspheric lens; (2) the filter 21 in this embodiment may be any one of a visible light filter and an infrared light filter, but the thicknesses of the visible light filter and the infrared light filter selected in this embodiment are the same and are both 0.3 mm.
Please refer to table 2, which shows the related parameters of each lens of the super-wide-angle lens in this embodiment.
TABLE 2a
TABLE 2b
Referring to fig. 6 and 7, the curvature of field and distortion curve of the super-wide-angle lens in this embodiment are shown, and it can be seen from the figures that both the curvature of field and the distortion are well corrected. Referring to fig. 7 and 8, MTF curves of the ultra-wide-angle lens of the present embodiment in the visible spectrum and the 850nm infrared spectrum are shown, and it can be seen that the lens of the present embodiment has good resolution and resolution under the day and night confocal condition.
Example 3
Referring to fig. 9, a schematic view of an ultra-wide angle lens structure according to a third embodiment of the present application is shown, in which the lens structure in this embodiment is substantially the same as that in embodiment 1, except that: in this embodiment, in order to reduce the cost of processing, assembly and materials, the double cemented lens composed of the first sub-lens 131 and the second character lens 132 in embodiment 1 is changed into one lens, the shape of the cemented lens is the same as that of the first embodiment, the cemented lens is a spherical meniscus lens with the concave surface facing the object surface, and the position of the aspheric surface is moved from the position before the diaphragm to the position of the second lens for better correcting distortion. And the lens behind the diaphragm is a meniscus lens.
The optical filter 30 in this embodiment may be any one of a visible light filter and an infrared light filter, but the thicknesses of the visible light filter and the infrared light filter selected in this embodiment are the same and are both 0.3 mm.
Please refer to table 3, which shows the related parameters of each lens of the super-wide-angle lens provided in this embodiment.
TABLE 3a
TABLE 3b
Referring to fig. 10 and 11, it can be seen that the field curvature and distortion of the super-wide-angle lens of the present embodiment are well corrected. Referring to fig. 11 and 12, MTF curves of the super-wide-angle lens in the present embodiment in the visible spectrum and the 850nm infrared spectrum are shown, and it can be seen that the lens in the present embodiment has good resolution and resolution under the day and night confocal condition.
Referring to table 4, the optical characteristics corresponding to each of the three embodiments include the system focal length F, F # and total system length T of the super-wide-angle lensLAnd the angle of view 2 theta, and also includes the correlation value corresponding to each relational expression.
TABLE 4
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. 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. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. The utility model provides a super wide angle lens which characterized in that, includes diaphragm and the battery of lens that constitutes by the glass material, from the thing side to the imaging surface, the battery of lens includes in proper order:
a first lens with negative focal power, wherein the first lens is a meniscus spherical lens with a concave surface facing the imaging surface;
a second lens with negative focal power, wherein the second lens is a meniscus spherical lens or a meniscus aspheric lens with a concave surface facing the imaging surface;
a third lens with negative focal power, wherein the third lens is a meniscus spherical lens, and the concave surface faces the object side;
a fourth lens with positive focal power, wherein the fourth lens is a biconvex aspheric lens, a meniscus aspheric lens or a biconvex spherical lens;
a fifth lens with positive focal power, wherein the fifth lens is a biconvex spherical lens or a meniscus spherical lens with a concave surface facing the imaging surface;
the sixth lens is a concave spherical lens and has negative focal power;
a seventh lens with positive focal power, wherein the seventh lens is a biconvex spherical lens;
an eighth lens with positive focal power, wherein the eighth lens is a biconvex aspheric lens;
the diaphragm is arranged between the fourth lens and the fifth lens;
the ultra-wide-angle lens satisfies the relation:
0.9＜Δh100/Δh0＜1.1；
wherein,. DELTA.h0Denotes the imaging size at a field angle of 0 DEG to 1 DEG, Δ h100Representing the imaging size at 99 deg. to 100 deg. field angles.
2. The ultra-wide angle lens of claim 1, wherein the third lens comprises:
the first sub-lens is a biconcave spherical lens;
and the second sub lens is a spherical lens with a convex surface facing the imaging surface, and the first sub lens and the second sub lens are cemented into the third lens.
3. The ultra-wide angle lens of claim 1, wherein:
if the second lens element is a meniscus spherical lens element, the fourth lens element is a biconvex aspheric lens element or a meniscus aspheric lens element, and the fifth lens element is a biconvex spherical lens element.
4. The ultra-wide angle lens of claim 1, wherein:
if the second lens element is a meniscus aspheric lens element, the fourth lens element is a biconvex spherical lens element, and the fifth lens element is a meniscus spherical lens element with a concave surface facing the image plane.
5. The ultra-wide angle lens of any one of claims 1 to 4, wherein the ultra-wide angle lens satisfies the relationship:
6＜TL/(h/2)＜9；
wherein, TLThe total optical length of the whole super-wide-angle lens is shown, and h represents the image surface height.
6. The ultra-wide angle lens of any one of claims 1 to 4, wherein the ultra-wide angle lens satisfies the relationship:
wherein the content of the first and second substances,
the power of the first lens is indicated,
the power of the entire ultra-wide angle lens is expressed.
7. The ultra-wide angle lens of any one of claims 1 to 4, wherein the ultra-wide angle lens satisfies the relationship:
wherein the content of the first and second substances,
represents the power of the entire ultra-wide angle lens,
representing the power of each lens combination between the object side and the diaphragm,
the power of each lens combination between the diaphragm and the imaging plane is indicated.
8. The ultra-wide angle lens of any one of claims 1 to 4, wherein the ultra-wide angle lens satisfies the relationship:
70＜V8＜91；
40＜V8-V1＜70；
wherein, V8Abbe number, V, of the fifth lens1The abbe number of the first lens is shown.
9. The ultra-wide angle lens of any one of claims 1 to 4, wherein the ultra-wide angle lens satisfies the relationship:
0.5＜(R2F-R2B)/R2F＜0.9；
-0.9＜R8B/(R8F-R8B)＜-0.6；
wherein R is2FDenotes the radius of curvature, R, of the object-side vertex of the second lens2BDenotes the radius of curvature of the vertex of the image-side surface of the second lens, R8FDenotes the object-side vertex radius of curvature, R, of the eighth lens8BThe eighth lens image side vertex radius of curvature is shown.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910351593.9A CN110133827B (en) | 2019-04-28 | 2019-04-28 | Super wide-angle lens |
| PCT/CN2020/086775 WO2020221137A1 (en) | 2019-04-28 | 2020-04-24 | Ultra wide-angle lens |
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| CN201910351593.9A CN110133827B (en) | 2019-04-28 | 2019-04-28 | Super wide-angle lens |
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| CN110133827A CN110133827A (en) | 2019-08-16 |
| CN110133827B true CN110133827B (en) | 2021-06-08 |
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| CN110133827B (en) * | 2019-04-28 | 2021-06-08 | 江西联创电子有限公司 | Super wide-angle lens |
| CN111443462B (en) * | 2020-05-18 | 2021-09-21 | 苏州东方克洛托光电技术有限公司 | Projector additional lens |
| CN112285911B (en) * | 2020-09-29 | 2022-11-04 | 江西联创电子有限公司 | Ultra-wide-angle lens and imaging device |
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| CN110133827A (en) | 2019-08-16 |
| WO2020221137A1 (en) | 2020-11-05 |
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