CN111474689A - Wide-angle lens and panoramic camera system - Google Patents
Wide-angle lens and panoramic camera system Download PDFInfo
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- CN111474689A CN111474689A CN202010576909.7A CN202010576909A CN111474689A CN 111474689 A CN111474689 A CN 111474689A CN 202010576909 A CN202010576909 A CN 202010576909A CN 111474689 A CN111474689 A CN 111474689A
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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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/0065—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having a beam-folding prism or mirror
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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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- 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
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B37/00—Panoramic or wide-screen photography; Photographing extended surfaces, e.g. for surveying; Photographing internal surfaces, e.g. of pipe
- G03B37/04—Panoramic or wide-screen photography; Photographing extended surfaces, e.g. for surveying; Photographing internal surfaces, e.g. of pipe with cameras or projectors providing touching or overlapping fields of view
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Abstract
The application discloses wide-angle lens and panoramic camera system relates to the optical lens field. The wide-angle lens includes, in order from an object side to an imaging surface: the lens comprises a first lens with negative focal power, a second lens with negative focal power, a reflection element without focal power for light path turning back, a third lens with positive focal power, a fourth lens with positive focal power, a diaphragm, a fifth lens with negative focal power, a sixth lens with positive focal power, a cemented lens consisting of the fifth lens and the sixth lens, a seventh lens with positive focal power, and a fourth power of the relative illumination RI of the wide-angle lens and the cosine value of the image surface chief ray angle of the wide-angle lens
Satisfies the following conditions:
. The wide-angle lens and the panoramic camera system have high relative illumination outside the characteristic of meeting the requirement of omnibearing no-dead-angle camera shooting, so that the spliced picture has high imaging quality, and the phenomenon of obvious brightness attenuation cannot occur at the picture splicing junction.
Description
Technical Field
The present disclosure relates to optical lenses, and particularly to a wide-angle lens and a panoramic camera system.
Background
In recent years, with the popularization of VR virtual reality and the rise of panoramic live broadcasting, cameras recording 360 ° panoramic imaging have begun to exhibit explosive growth. The panoramic camera that appears at present adopts two 180 cameras mostly, need not to rotate the camera and finds a view, can splice synthetic panoramic photo in the camera automatically after directly shooting, has made things convenient for user's shooting and use greatly.
With the rise of panoramic cameras at present, on the one hand, there is also a great promotion space in resolution and picture quality, and on the other hand, the problem of brightness weakness at the image splicing position is also urgently needed to be improved, because of the difference between the camera and the illumination intensity, brightness unevenness inside one image and among images can be caused, and light and shade alternation can occur in the spliced images, that is, the problem of excessive discontinuity between the images can exist at the image splicing position.
Disclosure of Invention
Based on this, an object of the present application is to provide a wide-angle lens and a panoramic imaging system, the wide-angle lens and the panoramic imaging system have at least the advantages of no dead angle in all directions, high image brightness reduction degree, high imaging quality and the like.
In order to achieve the purpose, the technical scheme of the application is as follows:
in a first aspect, the present application provides a wide-angle lens, sequentially including from an object side to an imaging plane: the lens comprises a first lens with negative focal power, a second lens and a third lens, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens with negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; a reflection element for optical path folding without optical power; the third lens with positive focal power, the object side surface of the third lens is a plane, a convex surface or a concave surface, and the image side surface of the third lens is a convex surface; having positive optical powerThe object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface or a concave surface; the fifth lens with negative focal power is characterized in that the object side surface of the fifth lens is a convex surface or a concave surface, and the image side surface of the fifth lens is a concave surface; the fifth lens and the sixth lens form a cemented lens; the seventh lens has positive focal power, and both the object side surface and the image side surface of the seventh lens are convex surfaces; a diaphragm is arranged between the fourth lens and the fifth lens; the relative illumination RI of the wide-angle lens and the cosine of the image surface chief ray angle of the wide-angle lens are raised to the fourth power
Satisfies the following conditions:
。
in a second aspect, the present application further provides a panoramic camera system, which includes two sets of wide-angle lenses provided according to the first aspect, wherein the two sets of wide-angle lenses are arranged in a central symmetry manner, and the imaging surfaces of the two sets of wide-angle lenses are oppositely arranged in a central symmetry manner.
Compared with the prior art, the wide-angle lens provided by the application adopts 7 lenses and 1 reflecting element to be matched with each other for use, particularly, the relative illumination of the wide-angle lens is higher through the combination of focal powers among different lenses, the field angle can reach more than 200 degrees, the wide-angle lens at least has the advantages of omnibearing no dead angle, high image brightness reduction degree and high imaging quality, the wide-angle lens has 48MP high pixels, and the imaging requirements of 1/2-inch large-target-surface COMS chips can be matched. In addition, the panoramic camera system that this application provided includes two sets of centrosymmetric wide-angle lens, and the total length of reflection element front end light path is little, and the total length after two wide-angle lens concatenations is little, has satisfied the market to the user demand of little volume, high pixel and the high definition panoramic camera of formation of image.
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 a panoramic imaging system according to a first embodiment of the present application;
fig. 2 is a schematic structural diagram of a wide-angle lens of a panoramic imaging system according to a first embodiment of the present application;
fig. 3 is an MTF diagram of a wide-angle lens of a panoramic imaging system according to a first embodiment of the present application;
fig. 4 is a diagram of relative illuminance of a wide-angle lens of a panoramic imaging system according to a first embodiment of the present application;
fig. 5 is an image plane main light ray diagram of a wide-angle lens of a panoramic imaging system according to a first embodiment of the present application;
fig. 6 is a schematic structural diagram of a panoramic imaging system according to a second embodiment of the present application;
fig. 7 is a schematic structural diagram of a wide-angle lens of a panoramic imaging system according to a second embodiment of the present application;
fig. 8 is an MTF diagram of a wide-angle lens of a panoramic imaging system according to a second embodiment of the present application;
fig. 9 is a diagram of relative illuminance of a wide-angle lens of a panoramic imaging system according to a second embodiment of the present application;
fig. 10 is an image plane main light ray diagram of a wide-angle lens of a panoramic imaging system according to a second embodiment of the present application;
fig. 11 is a schematic structural diagram of a panoramic imaging system according to a third embodiment of the present application;
fig. 12 is a schematic structural diagram of a wide-angle lens of a panoramic imaging system according to a third embodiment of the present application;
fig. 13 is an MTF diagram of a wide-angle lens of a panoramic imaging system according to a third embodiment of the present application;
fig. 14 is a diagram of relative illuminance of a wide-angle lens of a panoramic imaging system according to a third embodiment of the present application;
fig. 15 is an image plane main light ray diagram of a wide-angle lens of a panoramic imaging system according to a third embodiment of the present application.
The reference numbers illustrate:
Detailed Description
In order to facilitate a better understanding of the present application, it will now be described more fully with reference to the accompanying drawings. Several embodiments of the present application are illustrated in the drawings, but the present application may 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.
The application provides a wide-angle lens, includes in proper order from the object side to the imaging surface: the lens comprises a first lens with negative focal power, a second lens and a third lens, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens with negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; a reflection element for optical path folding without optical power; the third lens with positive focal power, the object side surface of the third lens is a plane, a convex surface or a concave surface, and the image side surface of the third lens is a convex surface; the fourth lens with positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface or a concave surface; the fifth lens with negative focal power is characterized in that the object side surface of the fifth lens is a convex surface or a concave surface, and the image side surface of the fifth lens is a concave surface; the fifth lens and the sixth lens form a cemented lens; the seventh lens has positive focal power, and both the object side surface and the image side surface of the seventh lens are convex surfaces; wherein light is arranged between the fourth lens and the fifth lensDiaphragm stopping; in order to improve the relative illumination of the lens and ensure the reduction of the brightness contrast of the shot object by the lens, the wide-angle lens meets the conditional expression (1):
the RI represents the relative illuminance of the wide-angle lens, and the CRA represents the image plane chief ray angle of the wide-angle lens.
Because the fourth power of the angle cosine value of the image surface chief ray is a reference standard for judging whether the relative illumination of the lens is higher or not, the condition formula (1) limits that the fourth power ratio of the relative illumination to the angle cosine value of the image surface chief ray is more than 1.3, so that the relative illumination of the wide-angle lens is higher than the reference value, which shows that the relative illumination of the wide-angle lens is higher, the contrast of the brightness of a shot object is high, and the phenomenon that the brightness of a picture splicing part is obviously weakened can not occur.
The diaphragm can be made of shading paper with a light through hole in the center, and the light through aperture of the diaphragm is smaller than that of the space ring, so that the light through amount of the wide-angle lens is determined by the light through aperture of the diaphragm. The diaphragm is arranged between the fourth lens and the fifth lens, so that the field angle of the wide-angle lens can be improved, and the incident angle of the chip can be better matched; the shading paper with the light through hole in the center is used as the diaphragm, so that the requirement of the light through hole of the lens cone can be reduced, the forming difficulty of the light through hole of the lens cone is reduced, the production efficiency is improved, and the production cost is reduced.
The reflecting element can be a plane mirror and can be arranged at any required angle to bend the light path, so that the whole wide-angle lens is compact. In the embodiment of the present application, the reflection element is a right-angle reflection prism, and includes an incident surface, a reflection surface, and an exit surface, and the reflection surface bends the light incident from the incident surface at a certain angle and then emits the light from the exit surface.
The application provides a wide-angle lens adopts 7 lenses, 1 piece of reflection element uses of matcing each other, especially through the focal power combination between different lenses, can make wide-angle lens's relative illuminance higher, and the angle of vision can reach more than 200, make this wide-angle lens have all-round no dead angle at least, the high and high advantage of imaging quality of picture light and shade reduction degree, and wide-angle lens has 48 MP's high pixel, can match the imaging demand of the big target surface COMS chip of 1/2 inches.
In some embodiments, to improve the outdoor adaptability of the lens, all lenses of the wide-angle lens may be made of glass, so as to improve the anti-falling, anti-fog and high-low temperature environment image-resolving stability.
In order to improve the resolving power of the lens and reduce the vertical axis chromatic aberration of the lens, the second lens, the fourth lens and the seventh lens of the wide-angle lens all use aspheric glass lenses, the aberration of the lens can be corrected by using the aspheric glass lenses, the resolution of the lens is improved, and the imaging is clearer.
In some embodiments, in order to limit the overall length of the panoramic camera system when the panoramic camera system is assembled and ensure that the panoramic camera system has a good enough imaging quality, the wide-angle lens satisfies the following conditional expression:
0.7<D/T<0.8； （2）
where D denotes an optically effective outer diameter of the first lens, and T denotes a lateral distance (distance of the two first lenses) after the two wide-angle lenses are spliced.
When the D/T value exceeds the lower limit, the optical effective outer diameter of the first lens is relatively too small, and the light receiving capacity of the first lens is limited; when the value of D/T exceeds the upper limit, the optical effective outer diameter of the first lens is relatively overlarge, and excessive aberration is introduced; therefore, the value of D/T is limited between 0.7 and 0.8, the outer diameter of the obtained first lens is proper to the total length after lens splicing, lens aberration is effectively corrected, and the resolving power is good.
In some embodiments, to reduce the aberrations introduced by the reflective element, the wide-angle lens satisfies the following conditional expression:
α<5°； （3）
where α denotes the maximum angle of incidence of the incident light ray on the incident surface of the reflective element.
The reflecting element has no focal power, so that the incident angle of light on the incident surface of the reflecting element is the same as the emergent angle of the light on the emergent surface of the reflecting element, the angle of the light relative to the optical axis is not changed before and after the light passes through the reflecting element, and the reflecting element is arranged to turn the light path to reduce the transverse distance after the lens splicing, so that the aberration introduced into the lens system by the reflecting element is reduced as much as possible. Because light rays with different incidence angles have different optical path differences after passing through the reflecting element, the aberration introduced into the lens system by the reflecting element can be reduced as much as possible by satisfying the conditional expression (3).
In some embodiments, to reduce the overall size of the lens, the wide-angle lens satisfies the following conditional expression:
CRA≥29°，0.01<BFL/TTL<0.04; （4）
where CRA denotes an image plane chief ray angle of the wide-angle lens, BF L denotes a distance from an image side surface of the seventh lens to an imaging surface, and TT L denotes an optical total length of the wide-angle lens.
The method comprises the steps of obtaining a large CRA image plane, obtaining a relatively small overall dimension of the lens, wherein the image plane has a larger image plane size when the optical overall length of the lens is the same, obtaining a relatively large image plane by the large image plane chief ray angle when the optical overall length of the lens is the same, obtaining a relatively small overall dimension of the lens by the large image plane chief ray angle when the optical overall length of the lens is the same, being not beneficial to reducing the overall length of the lens when the value of BF L/TT L exceeds an upper limit, enabling a back focus to be too small when the value of BF L/TT L exceeds a lower limit, and accordingly causing interference between the lens and an imaging chip structure, and reasonably limiting the CRA and BF L of the.
In some embodiments, to correct the axial chromatic aberration of the lens, the wide-angle lens satisfies the conditional expression:
Vd6-Vd5>25; （5）
vd5 denotes the abbe number of the fifth lens, and Vd6 denotes the abbe number of the sixth lens.
The abbe number is an index indicating the dispersive power of the transparent medium. Generally, the smaller the abbe number of the lens, the more severe the dispersion; conversely, the larger the abbe number of the lens, the more slight the dispersion. The positive lens can generate positive chromatic aberration, and the negative lens can generate negative chromatic aberration, so that the chromatic aberration generated by the positive lens can be compensated only by the chromatic aberration generated by the negative lens, and the chromatic aberration can be corrected as far as possible by adopting a structure of matching the positive lens and the negative lens. The conditional expression (5) limits the abbe number difference of the fifth lens and the sixth lens, so that the fifth lens generates a large negative chromatic aberration, the sixth lens generates a small positive chromatic aberration, and then chromatic aberration compensation is performed on other lenses in the lens. Satisfying the above conditional expression (5), the chromatic aberration generated by each lens can be compensated reasonably, and the picture shot by the lens has higher color reduction degree.
In some embodiments, in order to reasonably control the shape of the cemented lens in the lens and fully utilize the aberration correction capability of the lens, the wide-angle lens satisfies the conditional expression:
wherein the content of the first and second substances,
5 denotes the power of the fifth lens,
and 6 denotes an optical power of the sixth lens.
The function of the cemented lens in the optical system is to correct chromatic aberration, which is generally the collocation of a front positive lens, a rear negative lens or a front negative lens and a rear positive lens, and the conditional expression (6) shows that the absolute values of the focal powers of the cemented positive and negative lenses are close to each other, so that the focal powers of the cemented positive and negative lenses are smaller without introducing more spherical aberration, and the aberration correction capability of the cemented lens is reasonably used.
Specifically, the surface shapes of the aspherical surfaces of the second lens, the fourth lens and the seventh lens all satisfy the following conditional expressions:
wherein z is the distance between the curved surface and the vertex of the curved surface in the direction of the optical axis, and h is the distance between the optical axis and the curveThe distance of the surface, c is the curvature of the vertex of the curved surface, k is the conic coefficient, a4、a6、a8、a10And respectively and sequentially representing the surface coefficients corresponding to the radial coordinates of the fourth order, the sixth order, the eighth order and the tenth order.
Through the conditional expression (7), the surface sizes of front and back aspheric surfaces of the second lens, the fourth lens and the seventh lens can be accurately set, and the wide-angle lens utilizes the powerful correction function of the aspheric surfaces to aberration, so that the imaging definition and sharpness of the lens are greatly improved.
When k is less than-1, the profile curve is hyperbolic, when k is equal to-1, the profile curve is parabolic, when k is between-1 and 0, the profile curve is elliptical, when k is equal to 0, the profile curve is circular, and when k is greater than 0, the profile curve is oblate.
In the following embodiments, the thickness, the radius of curvature, and the material selection of each lens in the wide-angle lens are different, and specific differences can be referred to in the parameter tables of the embodiments.
The wide-angle lens that this application embodiment provided is applicable to motion camera lens and monitoring lens, can realize 360 no dead angle viewfinding shooting or control.
First embodiment
Referring to fig. 1 and fig. 2, a panoramic imaging system 100 according to a first embodiment of the present disclosure includes two sets of wide-angle lenses 110 disposed in a central symmetry manner, and imaging surfaces (S18) of the two sets of wide-angle lenses 110 are disposed opposite to each other in a central symmetry manner.
The wide-angle lens 110 includes, in order from the object side to the image plane, a first lens L1, a second lens L2, a reflective element G1, a third lens L3, a fourth lens L4, a stop ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G2.
The first lens L has negative focal power, the object-side surface S1 of the first lens is convex, the image-side surface S2 of the first lens is concave, the second lens L has negative focal power, the object-side surface S3 of the second lens is convex, the image-side surface S4 of the second lens is concave, the reflecting element G1 has no focal power for optical path folding, the reflecting element G1 is a rectangular reflecting prism, the incident surface of the reflecting element is S5, the exit surface is S6, the third lens L03 has positive focal power, the object-side surface S7 of the third lens is flat, the image-side surface S8 is convex, the fourth lens L has positive focal power, the object-side surface S9 of the fourth lens is convex, the image-side surface S10 of the fourth lens is convex, the fifth lens 10 has negative focal power, the object-side surface S10 of the fifth lens is concave, the sixth lens 10 has positive focal power, the image-side surface S10 of the sixth lens is convex, the seventh lens 10 is a cemented convex surface S10, and a seventh lens stop 10 is arranged between the fifth lens 10 and the seventh lens 10, wherein the seventh lens 10 is a cemented convex surface S10.
Table 1 shows lens-related parameters of the wide-angle lens 110 provided in the present embodiment.
TABLE 1
Aspheric-related parameters of the second lens L2, the fourth lens L4, and the seventh lens L7 in the present embodiment are shown in table 2.
TABLE 2
Referring to fig. 3, it shows an MTF graph of the wide-angle lens 110 in the present embodiment, the MTF value of the full field of the lens is above 0.3 at a spatial frequency of 300lp/mm, and the lens has a higher resolution; referring to fig. 4, a relative illumination chart of the wide-angle lens 110 in the present embodiment is shown, in which the relative illumination of the lens in the full view field is all above 0.8; referring to fig. 5, it shows an image plane chief ray angle diagram of the wide-angle lens 110 in this embodiment, a chief ray of the peripheral field of view of the lens is 29.1 °, which indicates that the wide-angle lens 110 still has high relative illumination under the condition of a large chief ray angle.
In this embodiment, the image plane diameter of the wide-angle lens 110 is 4.6mm, the FOV reaches 200 °, and the transverse distance after lens system splicing (i.e. the distance between the two first lenses L1 in the two symmetrically arranged wide-angle lenses 110 of the panoramic imaging system 100) is 29.6 mm.
Second embodiment
Referring to fig. 6 and 7, a panoramic camera system 200 of the present embodiment includes two sets of wide-angle lenses 210 disposed in a central symmetry manner, where the wide-angle lens 210 of the present embodiment has a concave surface shape, which is substantially the same as the concave surface shape of each lens of the wide-angle lens 110 of the first embodiment, and the difference is that an object-side surface S7 of the third lens L3 is a concave surface, and the related parameters of each lens of the lens and the air space are different.
The relevant parameters of each lens of wide-angle lens 210 in the present embodiment are shown in table 3.
TABLE 3
Please refer to table 4, which shows the parameters related to the aspheric surfaces of the second lens L2, the fourth lens L4, and the seventh lens L7 in this embodiment.
TABLE 4
Referring to fig. 8, an MTF graph of the wide-angle lens 210 in the present embodiment is shown, where the MTF value of the full field of view of the lens is above 0.3 at a spatial frequency of 300lp/mm, and has a higher resolution; referring to fig. 9, a relative illumination chart of the wide-angle lens 210 in the present embodiment is shown, in which the relative illumination of the lens in the full view field is all above 0.75; referring to fig. 10, a diagram of image plane chief ray angles of the wide-angle lens 210 in the present embodiment is shown, where the chief ray of the peripheral field of view of the lens is 29 °, which indicates that the wide-angle lens 210 still has high relative illumination under the condition of a large chief ray angle.
In this embodiment, the image plane diameter of wide-angle lens 210 is 4.6mm, the FOV reaches 200 °, and the transverse distance (i.e., the distance between two first lenses L1 in two symmetrically arranged wide-angle lenses 210 of panoramic imaging system 200) after two wide-angle lenses 210 are spliced is 30.6 mm.
Third embodiment
Referring to fig. 11 and 12, a panoramic camera system 300 of the present embodiment includes two sets of wide-angle lenses 310 arranged in a central symmetry manner, where the structure of the wide-angle lens 310 in the present embodiment is substantially the same as that of the wide-angle lens 110 in the first embodiment, and the difference is that an object-side surface S7 of the third lens L3 is a convex surface, an image-side surface S10 of the fourth lens L4 is a concave surface, an object-side surface S11 of the fifth lens L5 is a convex surface, and the parameters related to the lenses of the lenses are different from the air space.
Please refer to table 5, which shows the relevant parameters of each lens of the wide-angle lens 310 in this embodiment.
TABLE 5
Referring to table 6, parameters related to the aspheric surface of the wide-angle lens 310 in the present embodiment are shown.
TABLE 6
Referring to fig. 13, it shows an MTF graph of the wide-angle lens 310 in the present embodiment, the MTF value of the full field of view of the lens is above 0.5 at a spatial frequency of 300lp/mm, and the lens has a higher resolution; referring to fig. 14, a relative illumination chart of the wide-angle lens 310 in the present embodiment is shown, in which the relative illumination of the lens in the full view field is above 0.8; referring to fig. 15, it shows an image plane chief ray angle diagram of the wide-angle lens 310 in the present embodiment, a chief ray of the peripheral field of view of the lens is 29 °, and the wide-angle lens 310 still has high relative illumination under the condition of a large chief ray angle.
In this embodiment, the image plane diameter of the wide-angle lens 310 is 4.6mm, the FOV reaches 200 °, and the transverse distance after lens system splicing (i.e. the distance between the two first lenses L1 in the two symmetrically arranged wide-angle lenses 310 of the panoramic camera system 300) is 28.2 mm.
Referring to fig. 7, the optical characteristics corresponding to the wide-angle lens provided in each of the above 3 embodiments include the focal length F, F # of the wide-angle lens, the transverse distance T after splicing the two wide-angle lenses, and the field of view FOV, and also include the correlation value corresponding to each of the above conditional expressions.
TABLE 7
The above embodiments are merely preferred embodiments of the present application and are not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A wide-angle lens, comprising, in order from an object side to an imaging plane:
the lens comprises a first lens with negative focal power, a second lens and a third lens, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens with negative focal power is characterized in that the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
a reflection element for optical path folding without optical power;
the third lens with positive focal power has a plane or convex or concave object-side surface and a convex image-side surface;
the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface or a concave surface;
the lens comprises a fifth lens with negative focal power, wherein the object side surface of the fifth lens is a convex surface or a concave surface, and the image side surface of the fifth lens is a concave surface;
the fourth lens is a fourth lens with positive focal power, the object-side surface and the image-side surface of the fourth lens are convex surfaces, and the fifth lens and the fourth lens form a cemented lens;
a seventh lens having a positive optical power, the seventh lens having convex object and image side surfaces;
a diaphragm is arranged between the fourth lens and the fifth lens;
the wide-angle lens meets the following conditional expression:
wherein, RI represents the relative illumination of the wide-angle lens, and CRA represents the image plane chief ray angle of the wide-angle lens.
2. The wide-angle lens of claim 1, wherein the first lens, the third lens, the fifth lens and the sixth lens are all glass spherical lenses, and the second lens, the fourth lens and the seventh lens are all glass aspherical lenses.
3. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
0.7<D/T<0.8;
wherein D represents the optical effective outer diameter of the first lens, and T represents the transverse distance after splicing of the two wide-angle lenses.
4. The wide-angle lens of claim 3, wherein the transverse distance between two of the wide-angle lenses after splicing is less than 31 mm.
5. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
α<5°;
wherein α represents the maximum angle of incidence of an incident ray at the entrance face of the reflective element.
6. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
CRA≥29°，0.01<BFL/TTL<0.04;
wherein, CRA represents an image plane chief ray angle of the wide-angle lens, BF L represents a distance from the seventh lens to the imaging plane, and TT L represents an optical total length of the wide-angle lens.
7. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
Vd6-Vd5>25;
wherein Vd5 denotes an abbe number of the fifth lens, and Vd6 denotes an abbe number of the sixth lens.
8. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
wherein the content of the first and second substances,
5 denotes the optical power of the fifth lens,
and 6 denotes an optical power of the sixth lens.
9. The wide-angle lens of claim 1, wherein the wide-angle lens has a relative illumination at full field of view greater than 0.75.
10. A panoramic camera system, comprising two groups of wide-angle lenses according to any one of claims 1 to 9, wherein the two groups of wide-angle lenses are arranged in a central symmetry manner, and the imaging surfaces of the two groups of wide-angle lenses are arranged in a central symmetry manner in an opposite manner.
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