CN114355582A - Wide-angle lens - Google Patents
Wide-angle lens Download PDFInfo
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- CN114355582A CN114355582A CN202210267134.4A CN202210267134A CN114355582A CN 114355582 A CN114355582 A CN 114355582A CN 202210267134 A CN202210267134 A CN 202210267134A CN 114355582 A CN114355582 A CN 114355582A
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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
- G02B13/001—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
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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
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0138—Head-up displays characterised by optical features comprising image capture systems, e.g. camera
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Abstract
The invention discloses a wide-angle lens, which comprises the following components in sequence from an object side to an imaging surface along an optical axis: a first lens having a negative optical power, an object side surface of the first lens being concave at a paraxial region; a second lens having an optical power; a diaphragm; a third lens having optical power; the fourth lens is provided with positive focal power, and the object side surface and the image side surface of the fourth lens are convex surfaces; a fifth lens having a negative optical power, an image-side surface of the fifth lens being concave at a paraxial region and having at least one inflection point. The wide-angle lens has the advantages of large visual angle, small f-theta distortion and light weight, and can meet the use requirements of miniaturized electronic equipment.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to a wide-angle lens.
Background
In recent years, with the rise of the VR industry, each large brand upgrades VR helmet equipment gradually and perfectly, equipment combines user experience, start with comfortable, convenient as the direction, some VR products of high-end have perspective function, can make the user experience the VR while, need not take off the helmet, directly can see external scene, wherein perspective function need simulate the observation scope that people's eye can through the camera lens, pass through photosensitive element with external scene and transmit to people's eye, this camera lens need have big angle of vision, little distortion, characteristics such as miniaturization, in order to satisfy the accurate weight requirement of restoring external scene and reducing the VR helmet.
The traditional non-mobile phone type super-wide-angle lens mainly adopts a seven-piece or eight-piece glass spherical lens structure, the lens is high in cost, large in size and heavy in weight, aberrations such as distortion and spherical aberration cannot be well corrected, and the lens cannot be well applied to VR equipment.
Disclosure of Invention
Therefore, an object of the present invention is to provide a wide-angle lens having advantages of a large angle of view, a small f- θ distortion, and a light weight, and capable of satisfying the use requirements of a miniaturized electronic device.
The embodiment of the invention implements the above object by the following technical scheme.
The invention provides a wide-angle lens, which sequentially comprises the following components from an object side to an imaging surface along an optical axis: a first lens having a negative optical power, an object side surface of the first lens being concave at a paraxial region; a second lens having an optical power; a diaphragm; a third lens having optical power; the fourth lens is provided with positive focal power, and the object side surface and the image side surface of the fourth lens are convex surfaces; a fifth lens having a negative optical power, an image-side surface of the fifth lens being concave at a paraxial region and having at least one inflection point; the wide-angle lens at least comprises an aspheric lens; the wide-angle lens meets the following conditional expression: -6< f12/f < -0.5; where f12 denotes a combined focal length of the first lens and the second lens, and f denotes an effective focal length of the wide-angle lens.
Compared with the prior art, the wide-angle lens provided by the invention adopts five aspheric lenses with specific focal power, and the lens has large visual angle and reduces f-theta distortion aberration by matching specific surface shapes and reasonably distributing the focal power, reasonably distributing the combined focal power of the first lens and the second lens and reasonably correcting off-axis aberration by using the aspheric lenses, so that the weight of a system is effectively reduced, and the use requirements of light weight, thinness and low cost of portable electronic equipment are better met.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a wide-angle lens according to a first embodiment of the present invention;
fig. 2 is a graph showing f-theta distortion of the wide-angle lens according to the first embodiment of the present invention;
FIG. 3 is a field curvature diagram of a wide-angle lens according to a first embodiment of the present invention;
FIG. 4 is a vertical axis chromatic aberration diagram of the wide-angle lens according to the first embodiment of the present invention;
fig. 5 is a schematic structural diagram of a wide-angle lens according to a second embodiment of the present invention;
fig. 6 is a graph showing f-theta distortion of a wide-angle lens according to a second embodiment of the present invention;
FIG. 7 is a field curvature diagram of a wide-angle lens according to a second embodiment of the present invention;
FIG. 8 is a vertical axis chromatic aberration diagram of a wide-angle lens according to a second embodiment of the present invention;
fig. 9 is a schematic structural diagram of a wide-angle lens according to a third embodiment of the present invention;
fig. 10 is a graph showing f-theta distortion of a wide-angle lens according to a third embodiment of the present invention;
fig. 11 is a field curvature diagram of a wide-angle lens according to a third embodiment of the present invention;
fig. 12 is a vertical axis chromatic aberration diagram of a wide-angle lens according to a third embodiment of the present invention;
fig. 13 is a schematic structural diagram of a wide-angle lens according to a fourth embodiment of the present invention;
fig. 14 is a graph showing f-theta distortion of a wide-angle lens according to a fourth embodiment of the present invention;
fig. 15 is a field curvature graph of a wide-angle lens according to a fourth embodiment of the present invention;
fig. 16 is a vertical axis chromatic aberration diagram of the wide-angle lens according to the fourth embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. 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.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Like reference numerals refer to like elements throughout the specification.
The invention provides a wide-angle lens, which sequentially comprises the following components from an object side to an imaging surface along an optical axis: the lens comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens and an optical filter.
Wherein the first lens has a negative optical power, the object side surface of the first lens is concave at the paraxial region;
the second lens has focal power;
the third lens has focal power;
the fourth lens has positive focal power, and both the object side surface and the image side surface of the fourth lens are convex surfaces;
the fifth lens has a negative optical power, the image side surface of the fifth lens is concave at the paraxial region and has at least one inflection point;
the wide-angle lens at least comprises an aspheric lens.
The wide-angle lens adopts a five-piece type aspheric lens combination, and has the advantages of large visual angle, small f-theta distortion, light weight and thinness and the like through specific surface shape collocation and reasonable focal power distribution.
Wherein, the wide-angle lens satisfies the following conditional expression:
-6<f12/f<-0.5；（1）
where f12 denotes a combined focal length of the first lens and the second lens, and f denotes an effective focal length of the wide-angle lens. Satisfy above-mentioned conditional expression (1), the first lens of rational control and the combined lens of second lens are the negative lens, help obtaining longer system back focal length under the circumstances of big wide angle, short focal length, avoid the back focal not enough to lead to the unable design of ray apparatus or camera lens and chip components and parts to interfere to some extent, lead to unable formation of image.
In some embodiments, the second lens has a negative optical power, and the image-side surface of the second lens is concave; the third lens has positive focal power, and both the object side surface and the image side surface of the third lens are convex surfaces; the image-side surface of the first lens element is concave, and the object-side surface of the fifth lens element is convex at a paraxial region.
In some embodiments, the second lens has positive optical power, the object-side surface of the second lens is concave, and the image-side surface of the second lens is convex; the third lens has a negative optical power, and the image side surface of the third lens is concave at the paraxial region; the image-side surface of the first lens element is convex at a paraxial region thereof, and the object-side surface of the fifth lens element is concave.
Each lens in the wide-angle lens adopts different surface types to match, and the wide-angle lens has good imaging quality.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
-10<f12/f34<-1；（2）
where f12 denotes a combined focal length of the first lens and the second lens, and f34 denotes a combined focal length of the third lens and the fourth lens. Satisfying above-mentioned conditional expression (2), the positive spherical aberration that the negative lens group of first, two lens combination produced can be offset by the negative spherical aberration that the positive lens group of third, four lens combination produced, corrects the off-axis distortion aberration of system simultaneously, finally reaches a better balanced effect, effectively promotes imaging quality.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
2.5<TTL/f<3.5；（3）
2<TTL/IH<3；（4）
wherein, TTL represents the total optical length of the wide-angle lens, IH represents the image height corresponding to the half field angle of the wide-angle lens, and f represents the effective focal length of the wide-angle lens. Satisfying the above conditional expressions (3) and (4), the miniaturization of the wide-angle lens and the balance of high pixels can be better achieved.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
-2%<(IH-f×θ)/(f×θ)<1%；（5）
where θ represents a half field angle of the wide-angle lens, IH represents an image height corresponding to the half field angle of the wide-angle lens, and f represents an effective focal length of the wide-angle lens. Satisfying the above conditional expression (5), the f-theta distortion of the system can be controlled within +/-2%, the field angle and the image height of the system tend to be linear, and the distortion correction of the image algorithm is facilitated in the later whole machine application, so that the image size after the distortion correction is more primitive and natural.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
0.16<BEL/TTL<0.3；（6）
wherein, BEL represents the distance between the image side surface of the fifth lens and the imaging surface on the optical axis, and TTL represents the total optical length of the wide-angle lens. Satisfying above-mentioned conditional expression (6), can making the camera lens have longer system back focal length, avoid the back focal not enough to lead to the unable design of ray apparatus or camera lens and chip components and parts to interfere to some extent, lead to unable formation of image.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
0.5<SD32/SD11<0.7；（7）
where SD11 denotes an effective aperture of the object-side surface of the first lens, and SD32 denotes an effective aperture of the image-side surface of the third lens. Satisfy above-mentioned conditional expression (7), can make the effective bore of third lens be less than the effective bore of first lens, keep the system miniaturized, help the coma aberration and the field curvature correction of off-axis visual field simultaneously, promote imaging quality.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
0.5<f4/f<1；（8）
-2<R41/R42<-0.3；（9）
where f4 denotes a focal length of the fourth lens, f denotes an effective focal length of the wide-angle lens, R41 denotes a radius of curvature of an object-side surface of the fourth lens, and R42 denotes a radius of curvature of an image-side surface of the fourth lens. Satisfy above-mentioned conditional expression (8) and (9), can rationally control the focus and the face type of fourth lens, make its face type be more even biconvex, be favorable to rectifying the aberration, improve the resolution quality of wide-angle lens.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
-6<f1/f<-1；（10）
-2<f5/f<-0.3；（11）
where f1 denotes a focal length of the first lens, f5 denotes a focal length of the fifth lens, and f denotes an effective focal length of the wide-angle lens. The optical imaging lens meets the conditional expressions (10) and (11), and the focal length ratio of the first lens and the fifth lens is reasonably set, so that the first lens and the fifth lens bear the main negative focal power in the system, the aberration can be better corrected, and the integral imaging quality is improved.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
0.9<(CT2+CT3)/(ET2+ET3)<1.5；（12）
where CT2 denotes the thickness of the second lens on the optical axis, CT3 denotes the thickness of the third lens on the optical axis, ET2 denotes the edge thickness of the second lens, and ET3 denotes the edge thickness of the third lens. The condition (12) is satisfied, so that the thickness ratio of the second lens to the third lens is uniform, and the lens is favorably manufactured and molded; meanwhile, the edge of the lens can be prevented from being excessively bent, the difference of light incidence angles at different areas of the pupil is reduced, and the system sensitivity is reduced.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
0.7<SD21/SD12<1；（13）
where SD12 denotes an effective aperture of the image-side surface of the first lens, and SD21 denotes an effective aperture of the object-side surface of the second lens. Satisfying the above conditional expression (13), the light deflection tends to be slow, and the size of the head is reduced, thereby achieving the effects of maintaining the miniaturization of the head of the system and reducing the sensitivity of the system.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
3<CT4/AC45<11；（14）
where CT4 denotes the thickness of the fourth lens on the optical axis, and AC45 denotes an air gap between the fourth lens and the fifth lens on the optical axis. Satisfy above-mentioned conditional expression (14), through the central thickness of control fourth lens and the air interval's of fourth lens and fifth lens on the optical axis ratio, be favorable to reducing the space of fourth lens and account for the ratio, guarantee the equipment stability of lens in process of production to realize the miniaturization of wide-angle lens, make and satisfy the requirement of the whole machine size of terminal more easily.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
0.3<CT1/CT2<1.4；（15）
where CT1 denotes the thickness of the first lens on the optical axis, and CT2 denotes the thickness of the second lens on the optical axis. The conditional expression (15) is satisfied, and the aberration of the wide-angle lens can be effectively corrected while the processing feasibility of the wide-angle lens is ensured by limiting the central thickness ratio of the first lens and the second lens.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
-10<SAG21/SAG31<-1；（16）
where SAG21 represents the edge rise of the object-side surface of the second lens and SAG31 represents the edge rise of the object-side surface of the third lens. The optical lens meets the condition formula (16), and the object side surface types of the second lens and the third lens are reasonably matched, so that the optical lens is favorable for correcting the aberration of an off-axis field and a central field, and the imaging quality of the wide-angle lens is improved.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
-3<(R11+R12)/(R11-R12)<0.6；（17）
where R11 denotes a radius of curvature of the object-side surface of the first lens, and R12 denotes a radius of curvature of the image-side surface of the first lens. Satisfy above-mentioned conditional expression (17), through the face type collocation of reasonable first lens that sets up, be favorable to reducing the f-theta distortion of system, can reduce the field curvature sensitivity of first lens simultaneously for the field curvature distributes comparatively concentratedly when manufacturing in production of first lens.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
-0.5<(R21-R22)/(R21+R22)<2；（18）
where R21 denotes a radius of curvature of the object-side surface of the second lens, and R22 denotes a radius of curvature of the image-side surface of the second lens. By adjusting the surface shape of the second lens element at the paraxial region, the method satisfies the conditional expression (18), thereby reducing the shape change of the second lens element, reducing the system sensitivity, improving the moldability of the lens element, and increasing the manufacturing yield.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
0.5<(SAG11+SAG12)/CT1<2.5；（19）
where SAG11 denotes an edge rise of an object-side surface of the first lens, SAG12 denotes an edge rise of an image-side surface of the first lens, and CT1 denotes a thickness of the first lens on the optical axis. The processing difficulty of the lens is reduced by reasonably limiting the surface shape of the first lens on the premise of ensuring the bending force of the lens on light rays when the conditional expression (19) is met; if the lower limit is exceeded, the light ray bending capability of the first lens is insufficient, and the total length of the lens is long; if the upper limit is exceeded, the edge rise of the first lens is too large, resulting in difficulty in lens shaping.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
0.05<ET3/TTL<0.2；（20）
where ET3 denotes an edge thickness of the third lens, and TTL denotes an optical total length of the wide-angle lens. Satisfy above-mentioned conditional expression (20), guarantee that the third lens has sufficient edge thickness, can avoid the lens because the limit is thick too thin and assemble in-process equipment manipulator and press from both sides the problem that the lens causes the lens to split the limit at the shaping in-process.
As an implementation mode, a full plastic lens can be adopted, and glass and plastic can be mixed and matched, so that a good imaging effect can be achieved; in this application, for the volume that better reduces the camera lens, weight and reduce cost, adopt five plastic lens combinations, through specific surface shape collocation and reasonable focal power distribution for wide-angle lens reduces f-theta distortion aberration when having large visual angle, the effectual weight that reduces the system provides the optical property product of higher price/performance ratio, has satisfied the user demand of portable electronic equipment's frivolousization, wide-angle simultaneously better.
The invention is further illustrated below in the following examples. In various embodiments, the thickness, the curvature radius, and the material selection of each lens in the wide-angle lens are different, and the specific differences can be referred to in the parameter tables of the various embodiments. The following examples are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following examples, and any other changes, substitutions, combinations or simplifications which do not depart from the innovative points of the present invention should be construed as being equivalent substitutions and shall be included within the scope of the present invention.
In each embodiment of the present invention, when the lens is an aspherical lens, the surface shape of the aspherical lens satisfies the following equation:
wherein z is the distance rise from the aspheric surface vertex when the aspheric surface is at the position with the height h along the optical axis direction, c is the paraxial curvature of the surface, k is the quadric coefficient, A2iIs the aspheric surface type coefficient of 2i order.
First embodiment
Referring to fig. 1, a schematic structural diagram of a wide-angle lens 100 according to a first embodiment of the present invention is shown, where the wide-angle lens 100 sequentially includes, from an object side to an image plane S13: a first lens L1, a second lens L2, an aperture stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter G1.
Wherein the first lens element L1 has a negative power, the first lens element has an object-side surface S1 that is concave at the paraxial region and an image-side surface S2 that is concave;
the second lens element L2 has negative optical power, the object-side surface S3 of the second lens element being convex at the paraxial region and the image-side surface S4 of the second lens element being concave;
the third lens L3 has positive focal power, the object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is convex;
the fourth lens L4 has positive optical power, and both the object-side surface S7 and the image-side surface S8 of the fourth lens are convex;
the fifth lens element L5 has a negative power, the fifth lens element having an object-side surface S9 that is convex at the paraxial region and an image-side surface S10 that is concave at the paraxial region;
the object-side surface of the filter G1 is S11, and the image-side surface is S12.
The first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5 are all plastic aspheric lenses.
Specifically, the design parameters of each lens of the wide-angle lens 100 provided in the present embodiment are shown in table 1.
TABLE 1
The surface shape coefficients of the aspherical surfaces of the wide-angle lens 100 in the present embodiment are shown in table 2.
TABLE 2
Referring to fig. 2, fig. 3 and fig. 4, a f- θ distortion curve, a field curvature curve and a vertical axis chromatic aberration curve of the wide-angle lens 100 are shown. It can be seen from fig. 2 that the optical distortion is controlled within ± 1%, indicating that the distortion of the wide-angle lens 100 is well corrected; it can be seen from fig. 3 that the curvature of field is controlled within ± 0.07mm, which indicates that the wide-angle lens 100 has better curvature of field correction; it can be seen from fig. 4 that the vertical axis chromatic aberration at different wavelengths is controlled within ± 2 microns, which indicates that the vertical axis chromatic aberration of the wide-angle lens 100 is well corrected; as can be seen from fig. 2, 3, and 4, the aberration of the wide-angle lens 100 is well balanced, and has good optical imaging quality.
Second embodiment
As shown in fig. 5, which is a schematic structural diagram of the wide-angle lens 200 provided in this embodiment, the wide-angle lens 200 of this embodiment is substantially the same as the first embodiment, and the difference is mainly that: the object side surface S3 of the second lens element is concave, and the curvature radius, aspheric coefficient, thickness and material of the lens surface type are different.
Specifically, the design parameters of the wide-angle lens 200 provided in this embodiment are shown in table 3.
TABLE 3
The surface shape coefficients of the aspherical surfaces of wide-angle lens 200 in the present embodiment are shown in table 4.
TABLE 4
Referring to fig. 6, 7 and 8, it is shown that the f-theta distortion curve, the field curvature curve and the vertical axis chromatic aberration curve of the wide-angle lens 200 are respectively shown, and it can be seen from fig. 6 that the optical distortion is controlled within ± 1.5%, which indicates that the distortion of the wide-angle lens 200 is well corrected; it can be seen from fig. 7 that the paraxial curvature of field is controlled within ± 0.07mm, which indicates that the curvature of field of the wide-angle lens 200 is better corrected; it can be seen from fig. 8 that the vertical chromatic aberration at different wavelengths is controlled within ± 2 microns, which indicates that the vertical chromatic aberration of the wide-angle lens 200 is well corrected; it can be seen from fig. 6, 7 and 8 that the aberrations of wide-angle lens 200 are well balanced, with good optical imaging quality.
Third embodiment
As shown in fig. 9, which is a schematic structural diagram of the wide-angle lens 300 provided in this embodiment, the wide-angle lens 300 of this embodiment sequentially includes, from an object side to an image plane along an optical axis: a first lens L1, a second lens L2, an aperture stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter G1.
The first lens L1 has a negative power, the first lens object side surface S1 is concave at the paraxial region, and the first lens image side surface S2 is convex at the paraxial region;
the second lens L2 has positive focal power, the object-side surface S3 of the second lens is concave, and the image-side surface S4 of the second lens is convex;
the third lens L3 has negative power, the object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is concave at the paraxial region;
the fourth lens L4 has positive optical power, and both the object-side surface S7 and the image-side surface S8 of the fourth lens are convex;
the fifth lens L5 has negative power, the fifth lens has a concave object-side surface S9, and a concave image-side surface S10 at the paraxial region;
the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5 are all plastic aspheric lenses.
Specifically, the design parameters of the wide-angle lens 300 provided in this embodiment are shown in table 5.
TABLE 5
The surface shape coefficients of the aspherical surfaces of the wide-angle lens 300 in the present embodiment are shown in table 6.
TABLE 6
Referring to fig. 10, fig. 11 and fig. 12, which are respectively a f- θ distortion curve, a field curvature curve and a vertical axis chromatic aberration curve of the wide-angle lens 300, it can be seen from fig. 10 that the optical distortion is controlled within ± 2%, which indicates that the distortion of the wide-angle lens 300 is well corrected; it can be seen from fig. 11 that the curvature of field is controlled within ± 0.07mm, which indicates that the wide-angle lens 300 has better curvature of field correction; it can be seen from fig. 12 that the vertical axis chromatic aberration at different wavelengths is controlled within ± 2 microns, which indicates that the vertical axis chromatic aberration of the wide-angle lens 300 is well corrected; it can be seen from fig. 10, 11 and 12 that the aberrations of the wide-angle lens 300 are well balanced, with good optical imaging quality.
Fourth embodiment
As shown in fig. 13, which is a schematic structural diagram of the wide-angle lens 400 provided in this embodiment, the wide-angle lens 400 of this embodiment is substantially the same as the wide-angle lens 300 provided in the third embodiment, except that: the object-side surface S5 of the third lens element is concave at paraxial region, and has different curvature radius, aspheric coefficient, thickness and material.
Specifically, the design parameters of the wide-angle lens 400 provided in this embodiment are shown in table 7.
TABLE 7
In the present embodiment, aspheric parameters of the respective lenses in the wide-angle lens 400 are shown in table 8.
TABLE 8
Referring to fig. 14, 15 and 16, which are respectively a f-theta distortion curve graph, a field curvature curve graph and a vertical axis chromatic aberration graph of the wide-angle lens 400, it can be seen from fig. 14 that the optical distortion is controlled within ± 2%, which indicates that the distortion of the wide-angle lens 400 is well corrected; it can be seen from fig. 15 that the paraxial curvature of field is controlled within ± 0.05mm, which indicates that the curvature of field of the wide-angle lens 400 is better corrected; it can be seen from fig. 16 that the vertical axis chromatic aberration at different wavelengths is controlled within ± 2 microns, which indicates that the vertical axis chromatic aberration of the wide-angle lens 400 is well corrected; it can be seen from fig. 14, 15 and 16 that the aberrations of the wide-angle lens 400 are well balanced, and the optical imaging quality is good.
Please refer to table 9, which shows the optical characteristics corresponding to the wide-angle lens provided in the above four embodiments, including the field angle 2 θ, the total optical length TTL, the image height IH corresponding to the half field angle, the effective focal length f, and the related values corresponding to each of the aforementioned conditional expressions.
TABLE 9
It can be seen from the f-theta distortion curve graph, the field curvature curve graph and the vertical axis chromatic aberration curve graph of each embodiment that the f-theta distortion value of the wide-angle lens in each embodiment is within +/-2%, the field curvature value is within +/-0.1 mm, and the vertical axis chromatic aberration is within +/-2 microns, which shows that the lens provided by the embodiment of the invention has the advantages of large viewing angle, small f-theta distortion, miniaturization and the like, and has good resolving power.
In summary, the wide-angle lens provided by the invention adopts five aspheric lenses with specific focal power, and through specific surface shape collocation and reasonable focal power distribution, the wide-angle lens has a large viewing angle and simultaneously reduces f-theta distortion aberration, the weight of a system is effectively reduced by using the plastic lens, an optical performance product with higher cost performance is provided, and meanwhile, the use requirements of lightness, thinness and wide angle of portable electronic equipment are better met.
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 do not necessarily 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.
The above examples are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A wide-angle lens, comprising, in order from an object side to an imaging surface along an optical axis:
a first lens having a negative optical power, an object side surface of the first lens being concave at a paraxial region;
a second lens having an optical power;
a diaphragm;
a third lens having optical power;
the fourth lens is provided with positive focal power, and the object side surface and the image side surface of the fourth lens are convex surfaces;
a fifth lens having a negative optical power, an image-side surface of the fifth lens being concave at a paraxial region and having at least one inflection point;
the wide-angle lens at least comprises an aspheric lens;
the wide-angle lens meets the following conditional expression:
-6<f12/f<-0.5；
where f12 denotes a combined focal length of the first lens and the second lens, and f denotes an effective focal length of the wide-angle lens.
2. The wide-angle lens of claim 1, wherein the second lens has a negative optical power, and an image-side surface of the second lens is concave; the third lens has positive focal power, and both the object-side surface and the image-side surface of the third lens are convex surfaces; the image side surface of the first lens element is concave, and the object side surface of the fifth lens element is convex at a paraxial region.
3. The wide-angle lens of claim 1, wherein the second lens has a positive optical power, the second lens has a concave object-side surface, and the second lens has a convex image-side surface; the third lens has a negative optical power, the image side surface of the third lens being concave at the paraxial region; the image side surface of the first lens element is convex at a paraxial region, and the object side surface of the fifth lens element is concave.
4. The wide-angle lens of any one of claims 1 to 3, wherein the wide-angle lens satisfies the following conditional expression:
-10<f12/f34<-1；
wherein f34 represents a combined focal length of the third lens and the fourth lens.
5. The wide-angle lens of any one of claims 1 to 3, wherein the wide-angle lens satisfies the following conditional expression:
2.5<TTL/f<3.5；
2<TTL/IH<3；
wherein, TTL represents the optical total length of the wide-angle lens, and IH represents the image height corresponding to the half field angle of the wide-angle lens.
6. The wide-angle lens of any one of claims 1 to 3, wherein the wide-angle lens satisfies the following conditional expression:
-2%<(IH-f×θ)/(f×θ)<1%；
where θ represents a half field angle of the wide-angle lens, and IH represents an image height corresponding to the half field angle of the wide-angle lens.
7. The wide-angle lens of any one of claims 1 to 3, wherein the wide-angle lens satisfies the following conditional expression:
0.16<BEL/TTL<0.3；
wherein, BEL represents the distance between the image side surface of the fifth lens and the imaging surface on the optical axis, and TTL represents the total optical length of the wide-angle lens.
8. The wide-angle lens of any one of claims 1 to 3, wherein the wide-angle lens satisfies the following conditional expression:
0.5<SD32/SD11<0.7；
wherein SD11 represents an effective aperture of the object side surface of the first lens, and SD32 represents an effective aperture of the image side surface of the third lens.
9. The wide-angle lens of any one of claims 1 to 3, wherein the wide-angle lens satisfies the following conditional expression:
0.5<f4/f<1；
-2<R41/R42<-0.3；
where f4 denotes a focal length of the fourth lens, R41 denotes a radius of curvature of an object side surface of the fourth lens, and R42 denotes a radius of curvature of an image side surface of the fourth lens.
10. The wide-angle lens of any one of claims 1 to 3, wherein the wide-angle lens satisfies the following conditional expression:
-6<f1/f<-1；
-2<f5/f<-0.3；
wherein f1 denotes a focal length of the first lens, and f5 denotes a focal length of the fifth lens.
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Denomination of invention: Wide angle lens Effective date of registration: 20231218 Granted publication date: 20220812 Pledgee: Anhui pilot Free Trade Zone Hefei area sub branch of Huishang Bank Co.,Ltd. Pledgor: Hefei Lianchuang Optical Co.,Ltd. Registration number: Y2023980072240 |
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