CN114384673B - Wide-angle lens and imaging apparatus - Google Patents
Wide-angle lens and imaging apparatus Download PDFInfo
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- CN114384673B CN114384673B CN202210292441.8A CN202210292441A CN114384673B CN 114384673 B CN114384673 B CN 114384673B CN 202210292441 A CN202210292441 A CN 202210292441A CN 114384673 B CN114384673 B CN 114384673B
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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
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—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
- G02B13/0015—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
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Abstract
The invention discloses a wide-angle lens and imaging equipment, the wide-angle lens comprises the following components in sequence from an object side to an imaging surface along an optical axis: a first lens element having a negative optical power, the object-side surface of which is concave at the paraxial region and the image-side surface of which is concave; a diaphragm; the second lens with positive focal power has a convex object-side surface and a convex image-side surface; a third lens with negative focal power, wherein the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; wherein, the wide-angle lens satisfies the following conditional expression: 118 ° < FOV <120 °; 4.5% < | DIS | < 5.0%; wherein FOV represents the maximum field angle of the wide-angle lens in the diagonal direction, and DIS represents the maximum optical distortion in the 1.0 field of view of the wide-angle lens. The wide-angle lens has the advantages of large wide angle and small distortion.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to a wide-angle lens and imaging equipment.
Background
With the continuous deepening of economic construction, the economic level and the abundance degree of people are continuously improved, and the interest of people in purchasing new things is also increased. Wide-angle lenses have evolved from the first single pixel to the lens imaging diversity now. The wide-angle lens is widely applied to various fields such as mobile phones, vehicles, security and unmanned planes due to the advantages of wide shooting range, large depth of field, short focal length and the like, and has wide market prospect.
At present, the wide-angle lens on the market is mostly composed of 4 or more than 4 lenses, so that the cost is high, the market popularization rate is slowed down, the optical distortion is more than 15%, a distortion phenomenon with a large amplitude is generated around a picture when the image is shot or monitored, and the use experience of consumers is greatly influenced.
Disclosure of Invention
Therefore, the present invention is directed to a wide-angle lens and an imaging device, which have the advantages of a wide angle and a small distortion to meet the requirement of a consumer for image capture.
The embodiment of the invention implements the above object by the following technical scheme.
In a first aspect, the present invention provides a wide-angle lens, comprising, in order from an object side to an image plane 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 and an image-side surface of the first lens being concave; a diaphragm; the lens comprises a first lens with positive focal power, a second lens with positive focal power, a third lens and a fourth 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 convex surface; the third lens is provided with negative focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; wherein, the wide-angle lens satisfies the following conditional expression: 118 ° < FOV <120 °; 4.5% < | DIS | < 5.0%; wherein FOV represents the maximum field angle of the wide-angle lens in the diagonal direction, and DIS represents the maximum optical distortion in the 1.0 field of view of the wide-angle lens.
In a second aspect, the present invention provides an imaging apparatus including an imaging element for converting an optical image formed by the wide-angle lens into an electric signal, and the wide-angle lens provided in the first aspect.
Compared with the prior art, the wide-angle lens and the imaging equipment provided by the invention only comprise 3 aspheric plastic lenses with specific focal power and specific shapes, and the wide-angle lens meets the condition that the FOV in the diagonal direction is more than 110 degrees, and simultaneously the distortion numerical value can be controlled within 5 percent, thereby effectively reducing the amplitude of deformation and distortion of the periphery of a picture when the wide-angle lens takes a picture and also reducing the cost of the wide-angle lens. In addition, the wide-angle lens provided by the invention can be matched with a mainstream large-pixel imaging chip in the future market, so that the wide-angle lens can obtain higher brightness when working in a dark environment or in sunlight, the shooting effect is clearer, and the market competitiveness of the wide-angle lens provided by the invention is further enhanced.
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 field curvature diagram of a wide-angle lens according to a first embodiment of the present invention;
fig. 3 is a distortion graph of the wide-angle lens of the first embodiment of the present invention;
FIG. 4 is a graph showing an on-axis spherical aberration of a wide-angle lens according to a first embodiment of the present invention;
FIG. 5 is a lateral chromatic aberration diagram of the wide-angle lens according to the first embodiment of the present invention;
fig. 6 is a schematic structural diagram 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 distortion graph of a wide-angle lens according to a second embodiment of the present invention;
FIG. 9 is a graph showing an axial spherical aberration of a wide-angle lens according to a second embodiment of the present invention;
fig. 10 is a lateral chromatic aberration diagram of a wide-angle lens according to a second embodiment of the present invention;
fig. 11 is a schematic structural diagram of a wide-angle lens according to a third embodiment of the present invention;
fig. 12 is a field curvature graph of a wide-angle lens according to a third embodiment of the present invention;
fig. 13 is a distortion graph of a wide-angle lens according to a third embodiment of the present invention;
FIG. 14 is a graph showing an on-axis spherical aberration of a wide-angle lens according to a third embodiment of the present invention;
fig. 15 is a lateral chromatic aberration diagram of a wide-angle lens according to a third embodiment of the present invention;
fig. 16 is a schematic configuration diagram of an image forming apparatus according to a 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 diaphragm, a second lens, a third lens and an optical filter.
The first lens has negative focal power, the object side surface of the first lens is concave at a paraxial region, and the image side surface of the first lens is concave;
the second lens has positive 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 convex surface;
the third lens has negative focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
118°<FOV<120°；（1）
4.5%<|DIS|< 5.0%；（2）
wherein FOV represents the maximum field angle of the wide-angle lens in the diagonal direction, and DIS represents the maximum optical distortion in the 1.0 field of view of the wide-angle lens. The wide-angle lens meets the conditional expressions (1) and (2), is beneficial to a wider imaging space when the wide-angle lens is used for shooting and imaging, reduces the amplitude of deformation distortion of surrounding pictures, and enhances the market competitiveness of the wide-angle lens. If the imaging range of the wide-angle lens exceeds the conditional expression (1), the imaging range of the wide-angle lens is reduced, and the spatial impression of an imaging picture is weakened; if the conditional expression (2) is exceeded, the amplitude of distortion around the picture is increased when the wide-angle lens is used for imaging.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
1.16<D1/2*IH <1.23 ；（3）
where D1 denotes an effective diameter of the first lens, and IH denotes a half-image height of the wide-angle lens. The aperture of the first lens can be controlled to satisfy the conditional expression (3), so that the improvement of the field angle is facilitated, and the imaging range of the wide-angle lens is enlarged.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
-2.59<f1/ f< -1.83；（4）
where f1 denotes an effective focal length of the first lens, and f denotes an effective focal length of the wide-angle lens. And the conditional expression (4) is satisfied, the shape of the first lens can be controlled, the correction and distortion of peripheral aberration can be reduced, and the imaging quality of the wide-angle lens is improved.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
0.25<BFL/ TTL< 0.38；（5）
wherein BFL represents optical back focus in the wide-angle lens, TTL represents optical total length of the wide-angle lens. Satisfying conditional expression (5), can make the optics back focus of wide-angle lens is great, is favorable to reducing the interference between lens and the imaging chip to reduce the correction degree of difficulty of CRA.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
0.27< CT12/TTL<0.32；（6）
wherein CT12 represents an air gap on an optical axis between the first lens and the second lens, and TTL represents an optical total length of the wide-angle lens. The distance between the first lens and the second lens can be reasonably controlled by satisfying the conditional expression (6), and the tendency of light deflection is favorably slowed down, so that the sensitivity of the whole optical system is reduced, and the assembly yield of the wide-angle lens is improved.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
-0.85< f2/f3 < -0.48 ；（7）
wherein f2 represents the effective focal length of the second lens and f3 represents the effective focal length of the third lens. And the condition formula (7) is satisfied, the focal power of the second lens and the focal power of the third lens can be reasonably distributed, so that the light deflection trend is reasonably adjusted, and the relationship between the total length of the lens and the imaging quality is favorably balanced.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
-3.56< SAG21/R21+SAG22/R22<-2.47；（8）
wherein SAG21 represents the saggital height of the second lens object side, SAG22 represents the saggital height of the second lens image side, R21 represents the radius of curvature of the second lens object side, and R22 represents the radius of curvature of the second lens image side. The shape of the second lens can be reasonably controlled to bear main positive focal power, the deflection trend of light is accelerated, and the total length of the wide-angle lens is favorably shortened.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
-0.87< (SAG31-SAG32)/CT3 <-0.82；（9）
wherein SAG31 represents the saggital height of the object-side surface of the third lens, SAG32 represents the saggital height of the image-side surface of the third lens, and CT3 represents the center thickness of the third lens. Satisfying the conditional expression (9), the aberration of peripheral light can be adjusted by adjusting the shape of the third lens, which is beneficial to improving the resolution of the wide-angle lens.
In some embodiments, the wide-angle lens satisfies the following conditional expression:
2.36<D1/D3<2.86；（10）
wherein D1 represents the effective diameter of the first lens, and D3 represents the effective diameter of the third lens. The height difference between the head and the bottom of the wide-angle lens can be reasonably controlled by satisfying the conditional expression (10), and the assembly production difficulty of the wide-angle lens is favorably reduced.
In some embodiments, the first lens, the second lens and the third lens may be all glass lenses or all plastic lenses, or may be a combination of plastic lenses and glass lenses.
In some embodiments, the first lens, the second lens and the third lens are all plastic aspheric lenses. By adopting the aspheric lens, the wide-angle lens has better imaging quality, more compact structure and shorter optical total length.
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, the aspherical surface type of each 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, A 2i Is 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 includes, in order from an object side to an image plane S9 along an optical axis: a first lens L1, an aperture stop ST, a second lens L2, a third lens L3, and a filter G1.
The first lens element L1 is a plastic aspheric lens with negative power, the object-side surface S1 of the first lens element is concave at the paraxial region, and the image-side surface S2 of the first lens element is concave;
the second lens element L2 is a plastic aspheric lens with positive refractive power, the object-side surface S3 of the second lens element is convex, and the image-side surface S4 of the second lens element is convex;
the third lens element L3 is a plastic aspheric lens with negative power, and the object-side surface S5 of the third lens element is concave, and the image-side surface S6 of the third lens element is convex.
The object-side surface of the filter G1 is S7, and the image-side surface is S8.
The present embodiment provides wide-angle lens 100 with relevant parameters of each lens as shown in table 1,wherein R represents a radius of curvature (unit: mm), d represents an optical surface pitch (unit: mm), n d D-line refractive index, V, of the representative material d Represents the abbe number of the material.
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
In the present embodiment, the field curvature, distortion, on-axis spherical aberration and lateral chromatic aberration of the wide-angle lens 100 are respectively shown in fig. 2, fig. 3, fig. 4 and fig. 5, and it can be seen from fig. 2 to fig. 5 that the field curvature is controlled within ± 0.2mm, the optical distortion is controlled within ± 6%, the axial chromatic aberration of the shortest wavelength and the largest wavelength is controlled within ± 0.08mm, and the chromatic aberration of each wavelength with respect to the central wavelength in different fields of view is controlled within ± 4 microns, which indicates that the field curvature, distortion and chromatic aberration of the wide-angle lens 100 are all well corrected.
Second embodiment
Referring to fig. 6, a structural schematic diagram of the wide-angle lens 200 provided in this embodiment is substantially the same as the structure of the wide-angle lens 100 in the first embodiment in shape and material, but the center thickness of the first lens element and the surface inclination of the image side surface are changed.
The parameters related to each lens in wide-angle lens 200 provided in the present 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
In the present embodiment, the field curvature, distortion, on-axis spherical aberration and lateral aberration of wide-angle lens 200 are respectively shown in fig. 7, fig. 8, fig. 9 and fig. 10, and it can be seen from fig. 7 to fig. 10 that the field curvature is controlled within ± 0.2mm, the optical distortion is controlled within ± 8%, the axial chromatic aberration of the shortest wavelength and the largest wavelength is controlled within ± 0.12mm, and the chromatic aberration of each wavelength with respect to the central wavelength in different fields of view is controlled within ± 4 microns, which indicates that the field curvature, distortion and chromatic aberration of wide-angle lens 200 are all well corrected.
Third embodiment
Referring to fig. 11, the structure of the wide-angle lens 300 in this embodiment is substantially the same as that of the wide-angle lens 100 in the first embodiment, but the surface tilt angle of the object-side surface of the first lens element and the effective diameter of the third lens element are greatly changed.
The relevant parameters of each lens in wide-angle lens 300 in the present 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
In the present embodiment, the field curvature, distortion, on-axis spherical aberration and lateral aberration of wide-angle lens 300 are respectively shown in fig. 12, fig. 13, fig. 14 and fig. 15, and it can be seen from fig. 12 to fig. 15 that the field curvature is controlled within ± 0.2mm, the optical distortion is controlled within ± 8%, the shortest wavelength and the largest wavelength are controlled within ± 0.16mm, and the chromatic aberration of each wavelength with respect to the central wavelength in different fields of view is controlled within ± 7 microns, which indicates that the field curvature, distortion and chromatic aberration of wide-angle lens 300 are well corrected.
Table 7 shows the optical characteristics corresponding to the above three embodiments, which mainly include the effective focal length F, F #, total optical length TTL, entrance pupil diameter EPD, and maximum field angle 2 θ of the wide-angle lens in each embodiment, and the values corresponding to each conditional expression.
TABLE 7
In summary, the wide-angle lens provided by the embodiment has at least the following advantages:
(1) the wide-angle lens provided by the invention adopts three lenses with specific surface shapes and reasonable focal power distribution, so that the wide-angle lens has the advantages of large wide angle and small distortion.
(2) The wide-angle lens provided by the invention has a wider visual angle and a deeper depth of field, can effectively ensure that the front and the rear scenes of the shot main body can be clearly reproduced on the picture, and the front and the rear of the shot object feel strong, has a perspective effect and can enhance the infectivity of the picture.
(3) The wide-angle lens provided by the invention is only composed of 3 aspheric lenses, the production flow is simpler and easier to control, and the production cost has more competitive advantage.
Fourth embodiment
Referring to fig. 16, an imaging device 400 according to a fourth embodiment of the present invention is shown, where the imaging device 400 may include an imaging element 410 and a wide-angle lens (e.g., wide-angle lens 100) in any of the embodiments described above. The imaging element 410 may be a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and may also be a CCD (Charge Coupled Device) image sensor.
The imaging device 400 may be a mobile phone, a tablet, a camera, or any other electronic device equipped with the wide-angle lens.
The imaging apparatus 400 provided by the present embodiment includes the wide-angle lens 100, and since the wide-angle lens 100 has advantages of large wide angle and small distortion, the imaging apparatus 400 having the wide-angle lens 100 also has advantages of large wide angle and small distortion.
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-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the present 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 patent shall be subject to the appended claims.
Claims (9)
1. A wide-angle lens, comprising three lenses in order from an object side to an image plane 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 and an image-side surface of the first lens being concave;
a diaphragm;
the lens comprises a first lens with positive focal power, a second lens with positive focal power, a third lens and a fourth 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 convex surface;
the third lens is provided with negative focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface;
wherein, the wide-angle lens satisfies the following conditional expression:
118°<FOV<120°；
4.5%<|DIS|< 5.0%；
0.25<BFL/TTL< 0.38；
wherein, FOV represents the maximum field angle of the wide-angle lens in the diagonal direction, DIS represents the maximum optical distortion in the 1.0 field of the wide-angle lens, BFL represents the optical back focus of the wide-angle lens, and TTL represents the total optical length of the wide-angle lens.
2. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
1.16<D1/2*IH <1.23；
where D1 denotes an effective diameter of the first lens, and IH denotes a half-image height of the wide-angle lens.
3. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
-2.59<f1/f< -1.83；
where f1 denotes an effective focal length of the first lens, and f denotes an effective focal length of the wide-angle lens.
4. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
0.27<CT12/TTL<0.32；
wherein CT12 represents an air gap on an optical axis between the first lens and the second lens, and TTL represents an optical total length of the wide-angle lens.
5. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
-0.85<f2/f3< -0.48；
wherein f2 represents the effective focal length of the second lens and f3 represents the effective focal length of the third lens.
6. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
-3.56<SAG21/R21+SAG22/R22<-2.47；
wherein SAG21 represents the saggital height of the second lens object side, SAG22 represents the saggital height of the second lens image side, R21 represents the radius of curvature of the second lens object side, and R22 represents the radius of curvature of the second lens image side.
7. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
-0.87<(SAG31-SAG32)/CT3 <-0.82；
wherein SAG31 represents the saggital height of the object-side surface of the third lens, SAG32 represents the saggital height of the image-side surface of the third lens, and CT3 represents the center thickness of the third lens.
8. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following conditional expression:
2.36<D1/D3<2.86；
wherein D1 represents the effective diameter of the first lens and D3 represents the effective diameter of the third lens.
9. An imaging apparatus comprising the wide-angle lens according to any one of claims 1 to 8, and an imaging element for converting an optical image formed by the wide-angle lens into an electrical signal.
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| TWI704386B (en) * | 2018-03-31 | 2020-09-11 | 金佶科技股份有限公司 | Image capturing apparatus |
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Effective date of registration: 20240416 Address after: 231400 Jingwu Road, Tongcheng Economic and Technological Development Zone, Anqing City, Anhui Province Patentee after: Tongcheng Lianchuang Electronics Co.,Ltd. Country or region after: China Address before: No. 1699 Jingdong Avenue, high tech Industrial Development Zone, Nanchang City, Jiangxi Province Patentee before: JIANGXI LIANYI OPTICS Co.,Ltd. Country or region before: China |