CN116931230A - A refraction and reflection wide angle cell-phone auxiliary lens for shooing piano keyboard - Google Patents

A refraction and reflection wide angle cell-phone auxiliary lens for shooing piano keyboard Download PDF

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Publication number
CN116931230A
CN116931230A CN202310915119.0A CN202310915119A CN116931230A CN 116931230 A CN116931230 A CN 116931230A CN 202310915119 A CN202310915119 A CN 202310915119A CN 116931230 A CN116931230 A CN 116931230A
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China
Prior art keywords
lens
mobile phone
refraction
axis direction
shooting
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CN202310915119.0A
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Inventor
凌明
甄艳坤
卢胜男
付之俏
陈昱彤
王子科
程方中
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Xian Shiyou University
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Xian Shiyou University
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Priority to CN202310915119.0A priority Critical patent/CN116931230A/en
Publication of CN116931230A publication Critical patent/CN116931230A/en
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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
    • G02B13/0035—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 three lenses
    • 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
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/08—Catadioptric systems
    • 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
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies
    • G03B17/17—Bodies with reflectors arranged in beam forming the photographic image, e.g. for reducing dimensions of camera
    • 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
    • G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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

Abstract

The invention discloses a refraction and reflection wide-angle mobile phone auxiliary lens for shooting a piano keyboard, and belongs to the technical field of optical lenses. The lens comprises an annular surface reflecting mirror, a first lens, a second lens, a third lens and a diaphragm which are coaxially and sequentially arranged from an object space to an image space; setting the long direction of a rectangular keyboard as the Y-axis direction in a right-hand coordinate system of an object space, setting the wide direction of the rectangular keyboard as the X-axis direction, and setting the optical axis direction as the Z-axis direction vertical to the surface of the rectangular keyboard; the annular surface reflector has optical power; the first lens is a meniscus lens with negative focal power, one side close to the image space adopts a concave even aspherical surface, and the surface facing the object space is a convex spherical surface; the second lens is a meniscus lens with negative focal power, one side close to the image space adopts an outer convex even aspherical surface, and the surface facing the image space is an inner concave spherical surface; the third lens is a meniscus lens with positive focal power, one side close to the image side adopts a concave even aspherical surface, and the surface facing the object side is a convex spherical surface; the diaphragm is arranged on one side of the third lens close to the image side.

Description

A refraction and reflection wide angle cell-phone auxiliary lens for shooing piano keyboard
Technical Field
The invention belongs to the technical field of optical lenses, and particularly relates to a refraction and reflection wide-angle mobile phone auxiliary lens for shooting a piano keyboard.
Background
Along with the development and popularization of the online teaching method of the network, the piano education industry also advances to online, data and intelligent directions by means of an internet platform, so that the piano learning process is simplified, efficient and economical. Because the piano keyboard area has the rectangular view field distribution characteristic of larger aspect ratio, when the piano playing data is subjected to video acquisition, large view field and small distortion picture effect shooting are required, and the mobile phone lens cannot meet the requirement, even if the existing mobile phone auxiliary lens is combined, when the view field is larger than 60 degrees in the shooting process, the distortion in the lens group is over 40 percent. The defects are not ideal in shooting effect for on-line teaching of pianos, and are also unfavorable for further image processing of subsequent piano practice data.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the refraction and reflection wide-angle mobile phone auxiliary lens for shooting a piano keyboard, wherein a refraction and reflection mixing mode is adopted, the aspheric surface arrangement in the refraction lens is combined with the annular surface arrangement of the reflecting mirror, the system aberration is controlled, the light rays are enabled to just realize approximately parallel light emergence at a diaphragm connected with the mobile phone lens, meanwhile, a rectangular large-view-field range with a large object-side length-width ratio is converted into an object-side working-angle range of the mobile phone after passing through the wide-angle mobile phone auxiliary lens, and meanwhile, the rectangular aperture arrangement of the reflecting surface is utilized to further restrict the imaging range of the system view-field.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the invention provides a refraction and reflection wide-angle mobile phone auxiliary lens for shooting a piano keyboard, which comprises an annular surface reflector, a first lens, a second lens, a third lens and a diaphragm in sequence from an object space to an image space coaxially;
the annular surface reflecting mirror is a reflecting mirror with optical power;
the first lens is a meniscus lens with negative focal power, one side close to the image space adopts a concave even aspherical surface, and the surface facing the object space is a convex spherical surface;
the second lens is a meniscus lens with negative focal power, one side close to the image space adopts an outer convex even aspherical surface, and the surface facing the image space is an inner concave spherical surface;
the third lens is a meniscus lens with positive focal power, one side close to the image side adopts a concave even aspherical surface, and the surface facing the object side is a convex spherical surface;
the diaphragm is arranged on one side of the third lens close to the image side.
In the specific implementation process, in a right-hand coordinate system of an object, setting the long direction of a rectangular keyboard as the Y-axis direction, the wide direction of the rectangular keyboard as the X-axis direction, and the optical axis direction as the Z-axis direction, wherein the Z-axis is perpendicular to the surface of the rectangular keyboard;
the annular surface reflector is a reflector with zero focal power along the X-axis direction and negative focal power along the Y-axis direction;
the included angle between the normal line at the center of the view field of the annular surface reflector and the Z axis is 30 degrees; the rectangular aperture size of the annular surface reflector is 20mm 60mm.
In the implementation process, the overall lens length of the lens is 25.56mm; the full view field range of the Y axis of the lens is 900mm, and the full view field range of the X axis is 140mm;
the focal length of the lens in the Y-axis direction is 5306.942mm, and the focal length of the lens in the X-axis direction is 707.419mm.
In the implementation process, the annular surface of the annular surface reflecting mirror is formed by rotating a curve defined in a Y-Z plane around a symmetrical axis which is parallel to a Y axis and intersects with the Z axis;
the definition of the curve in the Y-Z plane is:
in the above formula: y is the Y-axis coordinate of the curve; z is the distance vector height of the curve from the vertex of the annular surface along the optical axis direction when the Y-axis coordinate of the curve is Y; b 1 、b 2 、b 3 、b 4 、b 5 、b 6 、b 7 Is a polynomial coefficient; c is the curvature of the lens surface; k is the conic coefficient.
In the specific implementation process, the curvature radius of the annular surface reflecting mirror is 44.302mm; the cone coefficient of the annular surface reflecting mirror is-1.201; b of the annular surface reflector 1 Is-0.011.
In a specific implementation process, the refractive index of the first lens is 1.77, and the abbe constant is 49.6; the refractive index of the second lens is 1.59, and the Abbe constant is 68.4; the refractive index of the third lens is 1.85, and the Abbe constant is 23.8.
In the specific implementation process, the concave even aspherical surface of the first lens, the convex even aspherical surface of the second lens and the concave even aspherical surface of the third lens satisfy an even aspherical mirror surface formula:
in the above formula: h represents the radial distance of the lens surface from the optical axis; c is the curvature of the lens surface; k is a conic coefficient; a, a 1 、a 2 、a 3 、a 4 、a 5 、a 6 Is an aspheric higher-order coefficient;z is the vector height from the vertex of the aspherical surface when the aspherical surface is at a position of height h along the optical axis direction.
In the implementation process, the cone coefficient of the concave even-order aspheric surface of the first lens is-0.492, the cone coefficient of the convex even-order aspheric surface of the second lens is-3.003, the cone coefficient of the concave even-order aspheric surface of the third lens is-0.663, and the aspheric surface high-order coefficients of the first lens, the second lens and the third lens are all 0.
In a specific implementation process, when the object distance is 300mm, after the lens is combined with the mobile phone body, the SMIA TV distortion value for the relative situation of the distortion of the edge and the middle position of the rectangular view field image with the length-width ratio of 6.428 is 0.22%.
In the specific implementation process, the vertical axis chromatic aberration between red and blue wavelength chromatic lights of a system formed by combining the lens and the mobile phone body is controlled within 2.8 mu m; the absolute value of the full field maximum distortion of the system is less than 0.5%; the field curvature of the system is corrected to within 0.2mm, with an astigmatism of 0.11mm at the maximum field of view.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a refraction and reflection wide-angle mobile phone auxiliary lens for shooting a piano keyboard based on the placement position of a mobile phone lens above the piano and the inclination angle of the mobile phone lens relative to the keyboard plane when the mobile phone shoots the piano keyboard area. The lens adopts a refraction and reflection mixed mode to image a rectangular core area of the piano keyboard, and the lens surface in the whole structure is respectively applied to spherical and aspherical refraction and annular surface reflection to control the aberration of an optical system, and the focus is to control the distortion at the edge of a rectangular view field. The use of the annular surface reflection can further optimize the imaging quality of the optical system and control the length of the lens in the optical system within a reasonable range on the basis of reducing the number of the lens sheets and simplifying the structure of the whole system.
Furthermore, the lens system designed by the invention considers the placement position of the mobile phone lens above the piano and the inclination angle of the mobile phone lens relative to the plane of the keyboard, and under the goal that the incident reflection optical axis can reflect according to the included angle of 60 degrees at the center of the annular surface reflector, the distortion control of the edge view field of the rectangular core area (the full view field of the y axis is 900mm, the full view field of the x axis is 140mm and covers all the midrange region, part of the bass region and the treble region) with the aspect ratio of 6.428 of the piano keyboard is completed by utilizing the parameter optimization of the annular surface. On the premise that the length of a lens in an optical system is controlled within a reasonable range, the number of refractive lenses applied by the system is three due to the use of annular surface reflection, the complexity of the surface of an aspheric lens is reduced, and the imaging quality of the optical system is optimized on the basis of simplifying the structure.
Drawings
Fig. 1 is an optical block diagram of a refraction and reflection wide angle mobile phone auxiliary lens for shooting a piano keyboard according to the present invention;
FIG. 2 is an X-Z plane light path diagram of the refraction and reflection wide angle mobile phone auxiliary lens combined with a virtual mobile phone lens for shooting a piano keyboard according to the present invention;
FIG. 3 is a Y-Z plane light path diagram of the refraction and reflection wide angle mobile phone auxiliary lens combined with the virtual mobile phone lens for shooting a piano keyboard;
FIG. 4 is a three-dimensional physical light path trace of the refraction and reflection wide angle mobile phone auxiliary lens combined with a virtual mobile phone lens for shooting a piano keyboard according to the present invention;
FIG. 5 is a detailed view of a three-dimensional physical optical path tracking of a refraction and reflection wide angle mobile phone auxiliary lens combined with a virtual mobile phone lens for shooting a piano keyboard according to the present invention;
FIG. 6 is a plot of imaging points of the refraction and reflection wide angle handset auxiliary lens combined with a virtual handset lens for shooting a piano keyboard according to the invention;
FIG. 7 is an image grid distortion map of a catadioptric wide angle handset auxiliary lens in combination with a virtual handset lens for shooting a piano keyboard according to the invention;
FIG. 8 is an image field curvature of a wide angle handset auxiliary lens combined with a virtual handset lens for photographing a piano keyboard according to the invention;
FIG. 9 is an image distortion chart of a refraction and reflection wide angle handset auxiliary lens combined with a virtual handset lens for shooting a piano keyboard according to the invention;
fig. 10 is an imaging MTF graph of a refraction and reflection wide angle handset auxiliary lens combined with a virtual handset lens for photographing a piano keyboard according to the invention;
FIG. 11 is a graph of the chromatic aberration of the imaging vertical axis of a wide angle handset auxiliary lens combined with a virtual handset lens for photographing a piano keyboard according to the invention;
FIG. 12 is a graph of relative illumination of an imaging of a catadioptric wide angle handset auxiliary lens in combination with a virtual handset lens for photographing a piano keyboard in accordance with the present invention;
wherein, 1-the annular surface reflecting mirror; 2-a first lens; 3-a second lens; 4-a third lens; 5-diaphragm.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein.
The invention is described in further detail below with reference to the attached drawing figures:
referring to fig. 1, an optical structure diagram of a wide-angle mobile phone auxiliary lens of a special shooting piano keyboard integrally comprises an annular surface reflecting mirror 1, a first lens 2, a second lens 3, a third lens 4 and a diaphragm 5 which are coaxially and sequentially arranged from an object space to an image space, wherein the first lens 2, the second lens 3 and the third lens 4 form a lens group. In the right-hand coordinate system of the object, the long direction of the rectangular keyboard is set to be the Y-axis direction, the wide direction of the rectangular keyboard is set to be the X-axis direction, and the optical axis direction is set to be the Z-axis direction vertical to the surface of the rectangular keyboard. The coordinate systems in fig. 1 to 3 are all coordinate system distributions after the object right hand coordinate system is reflected once by the annular surface.
The invention also includes that the annular surface reflector 1 is a reflector with optical power, the optical power of the annular surface reflector 1 along the X-axis direction is zero, and the reflector with negative power along the Y-axis direction is provided; the included angle between the normal line at the center of the view field of the annular surface reflector 1 and the Z axis is 30 degrees; the rectangular aperture size of the annular surface reflector 1 is 20mm 60mm; the first lens 2 is a meniscus lens with negative focal power, one side close to the image space adopts a concave even aspherical surface, and the surface facing the object space is a convex spherical surface; the center thickness of the first lens 2 is 0.924mm, the refractive index is 1.77, the Abbe constant is 49.6, the spherical radius of the concave even aspherical surface is 5.817mm, and the spherical radius of the convex spherical surface is 16.676mm; the second lens 3 is a meniscus lens with negative focal power, one side close to the image space adopts an outer convex even aspherical surface, and the surface facing the image space is an inner concave spherical surface; the center thickness of the third lens 3 is 0.697mm, the refractive index is 1.59, the Abbe constant is 68.4, the spherical radius of the convex even aspherical surface is 18.271mm, and the spherical radius of the concave spherical surface is 17.327mm; the third lens 4 is a meniscus lens with positive focal power, one side close to the image space adopts a concave even aspherical surface, and the surface facing the object space is a convex spherical surface; the center thickness of the third lens 4 was 0.697mm, the refractive index was 1.85, and the abbe constant was 23.8; the spherical radius of the concave even aspheric surface is 12.302mm, and the spherical radius of the convex spherical surface is 7.851mm. In order to make the lens group and the mobile phone carry out pupil matching and butt joint, the system aperture diaphragm 5 is arranged on the side of the third lens 4 close to the image side.
The overall lens length of the lens is 25.56mm; the full view field range of the Y axis of the lens is 900mm, and the full view field range of the X axis is 140mm; the focal length of the lens in the Y-axis direction was 5306.942mm, and the focal length in the x-axis direction was 707.419mm.
The distance between the annular mirror 1 and the first lens 2 is 4.937mm, the distance between the first lens 2 and the second lens 3 is 10.282mm, the distance between the second lens 3 and the third lens 4 is 1.935mm, and the distance between the third lens 4 and the diaphragm 5 is 5.8mm.
The invention is characterized in that the refraction lens is combined with the aspheric surface setting and the annular surface setting of the reflecting mirror by adopting a refraction and reflection mixing mode, the aberration of the system is controlled, the light is enabled to just realize approximately parallel light emergence at a diaphragm connected with a mobile phone lens, meanwhile, a rectangular large-view-field range with a larger object-side length-width ratio is converted into an object-side working angle range of the mobile phone after passing through the wide-angle mobile phone auxiliary lens, and meanwhile, the rectangular aperture setting of the reflecting surface is utilized to further restrict the imaging range of the system view field.
In fig. 2 to 5, after an incident beam of an object space sequentially passes through an annular surface reflector 1, a first lens 2, a second lens 3 and a third lens 4, approximately parallel light emergence is just realized at a diaphragm 5 connected with a virtual mobile phone lens, so that an object space view field range is converted into an object space working angle range of the mobile phone after passing through the wide-angle mobile phone auxiliary lens, and the object space incident beam is focused and imaged on a final image surface through the virtual mobile phone lens, namely, the mobile phone auxiliary lens and the virtual mobile phone lens are subjected to pupil butt joint at the diaphragm 5.
The invention further comprises that the annular surface reflector 1 utilizes an annular surface description reflector, and the annular surface structure of the annular surface reflector is beneficial to controlling the distortion aberration of the edge of the rectangular field of view. The materials of the first to third lenses are optical glasses, and even-order aspheres are adopted on the surfaces of the first lens 2, the second lens 3 and the third lens 4, which are close to the image space, to effectively control aberration. Meanwhile, due to the adoption of the annular surface reflecting mirror 1, the high-order coefficients of the aspherical surface related to the lens surface in the system are all set to 0 by optimizing the corresponding surface type parameters, so that the complexity of the aspherical surface is effectively reduced, the cost of the whole system is controlled by utilization, and the yield of the system is improved.
According to the refraction and reflection wide-angle mobile phone auxiliary lens for shooting a piano keyboard, the refraction and reflection hybrid mode is utilized, the number of optical elements is only 4, under the condition that the object distance is set to be 300mm, through reasonable structural layout selection, aspheric surface and annular surface type parameters are optimally set, the length of an optical whole system is controlled to be 25.56mm, the total view field range of an object side Y axis is 900mm, and under the condition that the total view field range of an X axis is 140mm (covering all midrange, part of bass region and treble region), the parameters such as optimal MTF, chromatic aberration and distortion are obtained, and the imaging requirement of the wide-angle lens is met.
The relevant parameters of table 1 are the relevant parameters of the surface type, radius of curvature, thickness, refractive index, abbe constant, and the like of each of the surfaces of all lenses from the object side to the image side of the refraction wide angle mobile phone auxiliary lens for photographing a piano keyboard of the present invention.
TABLE 1
In the above table, reference numerals 1 to 3 correspond to the annular surface mirror 1, reference numerals 4 and 5 correspond to the first lens 2, reference numerals 6 and 7 correspond to the second lens 3, reference numerals 8 and 9 correspond to the third lens 4, and reference numeral 10 corresponds to the diaphragm 5.
Meanwhile, the adopted even aspherical surface satisfies the even aspherical mirror surface formula:
in the above formula: h is the radial distance of the lens surface from the optical axis; c is the curvature of the lens surface; k is a conic coefficient; a, a 1 、a 2 、a 3 、a 4 、a 5 、a 6 As the aspheric surface is a high-order coefficient, the more coefficients are adopted by the aspheric surface, the more complex the aspheric surface becomes, and the system processing difficulty is increased; z is the vector height from the vertex of the aspherical surface when the aspherical surface is at a position of height h along the optical axis direction.
An annular surface mirror 1 is used, which is formed by rotating a curve defined in the Y-Z plane around a symmetry axis parallel to the Y axis and intersecting the Z axis. The definition of the curve in the Y-Z plane is:
in the above formula: y is the Y-axis coordinate of the curve; z is the distance vector height of the curve from the vertex of the annular surface along the optical axis direction when the Y-axis coordinate of the curve is Y; b 1 、b 2 、b 3 、b 4 、b 5 、b 6 、b 7 Is a polynomial coefficient; c is the curvature of the lens surface; k is a conical coefficient, and the optimization of the coefficients is solved to ensure that the coefficient meets the functions and the efficiency of the lens optical system; meanwhile, the aspheric higher-order coefficients of the aspheric surfaces used by the lenses are all 0.
The relevant parameters of table 2 are cone coefficients and polynomial coefficients for each mirror of the refraction and reflection wide angle mobile phone auxiliary lens for photographing a piano keyboard.
TABLE 2
Face number Surface type Coefficient of taper a 1 (b 1 )
1 Coordinate breakpoint surface 0 0
2 Annular surface -1.201 -0.011
3 Coordinate breakpoint surface 0 0
4 Spherical surface 0 0
5 Even aspherical surface -0.492 0
6 Spherical surface 0 0
7 Even aspherical surface -3.003 0
8 Spherical surface 0 0
9 Even aspherical surface -0.663 0
10 Diaphragm 0 0
Fig. 6 is an imaging point chart of the refraction and reflection wide-angle mobile phone auxiliary lens combined with the virtual mobile phone lens for shooting the piano keyboard, and it can be seen from fig. 6 that the light spots are concentrated in the central position, and the edge dispersion degree increases along with the increase of the field of view. Fig. 7 is an imaging grid distortion chart of the refraction and reflection wide-angle mobile phone auxiliary lens combined with the virtual mobile phone lens for shooting a piano keyboard, and it can be seen from fig. 7 that when the object distance is 300mm, the system is combined with the mobile phone body, for a rectangular view field with an aspect ratio of 6.428 (the full view field range of the y axis of the system is 900mm, the full view field range of the x axis is 140 mm), the imaging range is 6.22mm x 0.9968mm, and meets the receiving range of a mobile phone chip, and meanwhile, the SMIA TV distortion value reflecting the relative situation of the image edge and the middle position distortion is 0.22%.
Fig. 8 is an imaging field curvature diagram of a refraction and reflection wide-angle mobile phone auxiliary lens combined with a virtual mobile phone lens for shooting a piano keyboard, wherein S represents a sagittal field curvature, T represents a meridional field curvature, and the difference between the two is the astigmatism of the whole system, and from the graph, the field curvature of the system after the lens and the mobile phone body are combined is corrected to be within 0.2mm, and the astigmatism at the maximum field of view is 0.11mm.
Fig. 9 is an imaging distortion chart of the refraction and reflection wide-angle mobile phone auxiliary lens combined with the virtual mobile phone lens for shooting a piano keyboard, wherein the absolute value of the maximum distortion amount of the full-view lens is smaller than 0.5%, and the requirement of the mobile phone lens on the image distortion is met.
Fig. 10 is an imaging MTF graph of the refraction and reflection wide-angle mobile phone auxiliary lens combined with the virtual mobile phone lens for shooting a piano keyboard, wherein the ordinate in fig. 10 represents an optical modulation function coefficient, the abscissa is a spatial frequency (unit represents line pair number/mm), the curves in the graph correspond to fields of view with different directions of an object side and a Y respectively, the curves of each field of view of the field angle MTF are smooth, the height of the MTF value relative to the X axis is higher under the condition of smaller field of view, the imaging quality of the whole system is slightly reduced at the edge of the field of view, and the imaging quality of the whole system is better.
Fig. 11 is an imaging vertical axis chromatic aberration diagram of a refraction and reflection wide angle mobile phone auxiliary lens combined with a virtual mobile phone lens for photographing a piano keyboard according to the present invention. The vertical axis color difference curve graph can show that the vertical axis color difference between red and blue wavelength chromatic light of a system formed by combining the lens and the mobile phone body is controlled within 2.8 mu m, so that the industrial requirement of the chromatic difference of the lens of the mobile phone can be met.
Fig. 12 is an imaging relative illuminance graph of the refraction and reflection wide-angle mobile phone auxiliary lens combined with the virtual mobile phone lens for shooting a piano keyboard, and it can be seen from fig. 12 that the relative illuminance of the edge view field is above 48%, so that the industry requirement of the mobile phone lens on the imaging relative illuminance can be met.
All articles and references, including patent applications and publications, disclosed above are incorporated herein by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not substantially affect the essential novel features of the combination. The use of the terms "comprises" or "comprising" to describe combinations of elements, components, or steps herein also contemplates embodiments consisting essentially of such elements, components, or steps. By using the term "may" herein, it is intended that any attribute described as "may" be included is optional.
Multiple elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, component, section or step is not intended to exclude other elements, components, sections or steps.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but instead should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated herein by reference for the purpose of completeness. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to forego such subject matter, nor should the applicant be deemed to have such subject matter not considered to be part of the disclosed subject matter.

Claims (10)

1. The refraction and reflection wide-angle mobile phone auxiliary lens for shooting a piano keyboard is characterized by comprising an annular surface reflecting mirror (1), a first lens (2), a second lens (3), a third lens (4) and a diaphragm (5) in sequence from an object space to an image space coaxially;
the annular surface reflector (1) is a reflector with optical power;
the first lens (2) is a meniscus lens with negative focal power, one side close to the image space adopts a concave even aspherical surface, and the surface facing the object space is a convex spherical surface;
the second lens (3) is a meniscus lens with negative focal power, one side close to the image space adopts an outer convex even aspherical surface, and the surface facing the image space is a concave spherical surface;
the third lens (4) is a meniscus lens with positive focal power, one side close to the image side adopts a concave even aspherical surface, and the surface facing the object side is a convex spherical surface;
the diaphragm (5) is arranged on one side of the third lens (4) close to the image space.
2. The refraction and reflection wide-angle mobile phone auxiliary lens for shooting a piano keyboard according to claim 1, wherein in an object-side right-hand coordinate system, a rectangular keyboard length direction is set as a Y-axis direction, a rectangular keyboard width direction is set as an X-axis direction, an optical axis direction is set as a Z-axis direction, and the Z-axis is perpendicular to a rectangular keyboard surface;
the annular surface reflector (1) is a reflector with zero focal power along the X-axis direction and negative focal power along the Y-axis direction;
the included angle between the normal line at the center of the view field of the annular surface reflector (1) and the Z axis is 30 degrees; the rectangular aperture size of the annular surface reflector (1) is 20mm by 60mm.
3. The refraction and reflection wide-angle mobile phone auxiliary lens for shooting piano keyboard according to claim 2, wherein the overall lens length of the lens is 25.56mm; the full view field range of the Y axis of the lens is 900mm, and the full view field range of the X axis is 140mm;
the focal length of the lens in the Y-axis direction is 5306.942mm, and the focal length of the lens in the X-axis direction is 707.419mm.
4. The refraction and reflection wide-angle mobile phone auxiliary lens for shooting piano keyboard according to claim 2, characterized in that the annular surface of the annular surface reflector (1) is formed by rotating a curve defined in a Y-Z plane around a symmetry axis parallel to the Y axis and intersecting the Z axis;
the definition of the curve in the Y-Z plane is:
in the above formula: y is the Y-axis coordinate of the curve; z is the distance vector height of the curve from the vertex of the annular surface along the optical axis direction when the Y-axis coordinate of the curve is Y; b 1 、b 2 、b 3 、b 4 、b 5 、b 6 、b 7 Is a polynomial coefficient; c is the curvature of the lens surface; k is the conic coefficient.
5. The refraction and reflection wide angle mobile phone auxiliary lens for shooting piano keyboard according to claim 4, characterized in that the radius of curvature of the annular surface reflector (1) is 44.302mm; the conical coefficient of the annular surface reflector (1) is-1.201; b of the annular surface reflector (1) 1 Is-0.011.
6. The refraction and reflection wide angle mobile phone auxiliary lens for shooting piano keyboard according to claim 1, characterized in that the refractive index of the first lens (2) is 1.77 and abbe constant is 49.6; the refractive index of the second lens (3) is 1.59, and the Abbe constant is 68.4; the refractive index of the third lens (4) is 1.85, and the Abbe constant is 23.8.
7. The refraction and reflection wide-angle mobile phone auxiliary lens for shooting piano keyboard according to claim 1, characterized in that the concave even-order aspheric surface of the first lens (2), the convex even-order aspheric surface of the second lens (3) and the concave even-order aspheric surface of the third lens (4) satisfy an even-order aspheric mirror formula:
in the above formula: h represents the radial distance of the lens surface from the optical axis; c is the curvature of the lens surface; k is a conic coefficient; a, a 1 、a 2 、a 3 、a 4 、a 5 、a 6 Is an aspheric higher-order coefficient; z is the vector height from the vertex of the aspherical surface when the aspherical surface is at a position of height h along the optical axis direction.
8. The refraction and reflection wide-angle mobile phone auxiliary lens for shooting piano keyboard according to claim 7, wherein the cone coefficient of the concave even aspherical surface of the first lens (2) is-0.492, the cone coefficient of the convex even aspherical surface of the second lens (3) is-3.003, the cone coefficient of the concave even aspherical surface of the third lens (4) is-0.663, and the aspherical higher-order coefficients of the first lens (2), the second lens (3) and the third lens (4) are all 0.
9. The refraction and reflection wide-angle mobile phone auxiliary lens for shooting piano keyboard according to claim 1, wherein the SMIA TV distortion value for the opposite case of the distortion of the middle position at the edge of the rectangular view image with aspect ratio of 6.428 is 0.22% after combining the lens with the mobile phone body at the object distance of 300 mm.
10. The refraction and reflection wide-angle mobile phone auxiliary lens for shooting a piano keyboard according to claim 1, wherein the vertical axis chromatic aberration between red and blue light of a system formed by combining the lens and a mobile phone body is controlled within 2.8 μm; the absolute value of the full field maximum distortion of the system is less than 0.5%; the field curvature of the system is corrected to within 0.2mm, with an astigmatism of 0.11mm at the maximum field of view.
CN202310915119.0A 2023-07-24 2023-07-24 A refraction and reflection wide angle cell-phone auxiliary lens for shooing piano keyboard Pending CN116931230A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310915119.0A CN116931230A (en) 2023-07-24 2023-07-24 A refraction and reflection wide angle cell-phone auxiliary lens for shooing piano keyboard

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310915119.0A CN116931230A (en) 2023-07-24 2023-07-24 A refraction and reflection wide angle cell-phone auxiliary lens for shooing piano keyboard

Publications (1)

Publication Number Publication Date
CN116931230A true CN116931230A (en) 2023-10-24

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Application Number Title Priority Date Filing Date
CN202310915119.0A Pending CN116931230A (en) 2023-07-24 2023-07-24 A refraction and reflection wide angle cell-phone auxiliary lens for shooing piano keyboard

Country Status (1)

Country Link
CN (1) CN116931230A (en)

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