CN113031228B - Optical lens and imaging apparatus - Google Patents
Optical lens and imaging apparatus Download PDFInfo
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- CN113031228B CN113031228B CN202110581580.8A CN202110581580A CN113031228B CN 113031228 B CN113031228 B CN 113031228B CN 202110581580 A CN202110581580 A CN 202110581580A CN 113031228 B CN113031228 B CN 113031228B
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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
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
Abstract
The invention provides an optical lens and imaging equipment, the optical lens includes from the object side to the imaging surface along the optical axis in order; a diaphragm; the first lens has positive focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens 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 concave surface; the third lens element has a negative focal power, and has a concave object-side surface at a paraxial region and a concave image-side surface; the fourth lens element has a positive optical power, and has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the fifth lens has negative focal power, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has positive focal power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface; the seventh lens element has a negative power with an object side surface that is concave at the paraxial region and an image side surface that is concave at the paraxial region. The optical lens has compact structure, is beneficial to improving the screen occupation ratio of portable electronic products, and realizes the miniaturization of the lens and the balance of high pixels.
Description
Technical Field
The present invention relates to the field of imaging lens technologies, and in particular, to an optical lens and an imaging device.
Background
At present, along with the popularization of portable electronic devices (such as smart phones and cameras), and the popularity of social, video and live broadcast software, people have a higher and higher liking degree for photography, camera lenses become standard preparations of the portable electronic devices, and the camera lenses even become indexes which are considered primarily when consumers purchase the portable electronic devices.
With the continuous development of mobile information technology, portable electronic devices such as mobile phones are also developing in the directions of being light and thin, full-screen, ultra-high-definition imaging, and the like, which puts higher demands on camera lenses mounted on the portable electronic devices. In recent years, with the enthusiasm of consumers for the full-face screen of a mobile phone, the front lens is pursuing visual simplicity in addition to the demand for high pixels. The outer diameter of the head part and the whole volume of the existing camera lens are large, so that the Liuhai screen is formed. However, the larger the area of the bang, i.e., the larger the opening area on the screen of the mobile phone, the screen occupation ratio cannot be further improved.
Disclosure of Invention
Based on this, the present invention aims to provide an optical lens and an imaging apparatus to solve the above problems.
The embodiment of the invention achieves the aim through the following technical scheme.
In a first aspect, an embodiment of the present invention provides an optical lens, which sequentially includes, from an object side to an image plane along an optical axis: the lens comprises a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens; the first lens has positive focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens 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 concave surface; the third lens element has a negative focal power, and has a concave object-side surface at a paraxial region and a concave image-side surface; the fourth lens element has a positive optical power, and has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the fifth lens has negative focal power, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has positive focal power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface; the seventh lens element has a negative power, and has an object-side surface that is concave at the paraxial region and an image-side surface that is concave at the paraxial region; the first lens is a glass aspheric lens, and the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are plastic aspheric lenses; the optical lens satisfies the conditional expression: -2.5 < f3/f < -2.0; where f denotes a focal length of the optical lens, and f3 denotes a focal length of the third lens.
In a second aspect, an embodiment of the present invention further provides an imaging device, which includes an imaging element and the optical lens provided in the first aspect, where the imaging element is configured to convert an optical image formed by the optical lens into an electrical signal.
Compared with the prior art, the optical lens and the imaging device provided by the invention have the advantages that through reasonable collocation of the lens shapes among the seven lenses with specific refractive power and the reasonable combination of the focal powers, the structure is more compact while high pixels are met, the screen occupation ratio of a portable electronic product is favorably improved, the miniaturization of the lens and the balance of the high pixels are better realized, and the shooting experience of a user can be effectively improved.
Drawings
Fig. 1 is a schematic structural diagram of an optical lens provided in a first embodiment of the present invention;
fig. 2 shows an astigmatism graph of an optical lens provided by a first embodiment of the present invention;
fig. 3 shows a distortion curve of an optical lens provided by the first embodiment of the present invention;
fig. 4 is a vertical axis chromatic aberration diagram of an optical lens provided by the first embodiment of the invention;
fig. 5 is a graph showing an axial chromatic aberration of an optical lens provided by the first embodiment of the present invention;
fig. 6 is a schematic structural diagram of an optical lens provided in a second embodiment of the present invention;
fig. 7 shows an astigmatism graph of an optical lens provided by a second embodiment of the present invention;
fig. 8 shows a distortion curve of an optical lens provided by the second embodiment of the present invention;
fig. 9 is a vertical axis chromatic aberration diagram of an optical lens provided by the second embodiment of the present invention;
FIG. 10 is a graph showing axial chromatic aberration of an optical lens provided by a second embodiment of the present invention;
FIG. 11 is a schematic diagram of an optical lens according to a third embodiment of the present invention;
fig. 12 is an astigmatism graph of an optical lens provided by a third embodiment of the present invention;
fig. 13 is a distortion graph of an optical lens provided by a third embodiment of the present invention;
fig. 14 is a vertical axis chromatic aberration diagram of an optical lens provided by the third embodiment of the present invention;
fig. 15 is a graph showing an axial chromatic aberration of an optical lens provided by the third embodiment of the present invention.
Description of the main elements
| Optical lens | 100,200,300 | Diaphragm | ST |
| First lens | L1 | Second lens | L2 |
| Third lens | L3 | Fourth lens | L4 |
| Fifth lens element | L5 | Sixth lens element | L6 |
| Seventh lens element | L7 | Optical filter | G1 |
| Object side surface of the first lens | S1 | Image side surface of the first lens | S2 |
| Object side surface of the second lens | S3 | Image side surface of the second lens | S4 |
| Object side of the third lens | S5 | Image side surface of the third lens | S6 |
| Object side of the fourth lens | S7 | Image side surface of the fourth lens | S8 |
| Object side surface of fifth lens | S9 | Image side surface of the fifth lens element | S10 |
| Object side surface of sixth lens | S11 | Image side surface of sixth lens element | S12 |
| Object side surface of seventh lens | S13 | Image side surface of seventh lens | S14 |
| Object side of optical filter | S15 | Image side of optical filter | S16 |
| Image plane | S17 |
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Several embodiments of the invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
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. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The present invention provides an optical lens, comprising in order from an object side to an image side along an optical axis: the image side here means the side where an image plane is located, and the object side is the side opposite to the image side.
The first lens has positive focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens 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 concave surface;
the third lens has negative focal power, the object side surface of the third lens is concave at a paraxial region, and the image side surface of the third lens is concave;
the fourth lens has positive focal power, the object side surface of the fourth lens is convex at a paraxial region, and the image side surface of the fourth lens is concave at the paraxial region;
the fifth lens has negative focal power, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface;
the sixth lens has positive focal power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface;
the seventh lens element has a negative optical power, the seventh lens element having a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the first lens is a glass aspheric lens, and the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are plastic aspheric lenses;
in some optional embodiments, the optical lens satisfies the following conditional expression:
-2.5＜f3/f＜-2.0；（1）
where f denotes a focal length of the optical lens, and f3 denotes a focal length of the third lens.
When the conditional expression (1) is satisfied, the ratio of the third lens to the optical lens can be controlled, which is beneficial to shortening the total length of the optical lens and realizing the miniaturization of the system.
In some optional embodiments, the optical lens satisfies the following conditional expression:
0.1<ND3-ND2<0.2；（2）
where ND2 denotes a refractive index of the second lens, and ND3 denotes a refractive index of the third lens.
When the condition (2) is met, the materials of the second lens and the third lens can be reasonably selected, so that the chromatic aberration of the optical lens can be corrected, and the imaging quality of the optical lens can be improved.
In some optional embodiments, the optical lens satisfies the following conditional expression:
0.0<f1/f2<0.1；（3）
where f1 denotes a focal length of the first lens, and f2 denotes a focal length of the second lens.
Satisfy conditional expression (3), can rationally control the focus of first lens and second lens, avoid the focus undersize of first lens and the focus of second lens too big, be favorable to rectifying aberration and distortion, be favorable to shortening optical lens's optical total length simultaneously.
In some optional embodiments, the optical lens satisfies the following conditional expression:
0.70<R3/R4<0.85；（4）
where R3 denotes a radius of curvature of the object-side surface of the second lens, and R4 denotes a radius of curvature of the image-side surface of the second lens.
And the surface type of the second lens can be reasonably controlled to meet the requirement of thinning design when the conditional expression (4) is met, so that the field curvature can be corrected conveniently, and the performance of the optical lens is improved.
In some optional embodiments, the optical lens satisfies the following conditional expression:
0.05<f/(f2+f3)<0.1；（5）
-4<f34/f<-3；（6）
where f denotes a focal length of the optical lens, f2 denotes a focal length of the second lens, f3 denotes a focal length of the third lens, and f34 denotes a focal length of a combination of the third lens and the fourth lens.
When conditional expressions (5) and (6) are satisfied, the focal lengths of the second lens and the fourth lens can be reasonably distributed, correction of high-order aberration is facilitated to be reduced, meanwhile, the focal length of the optical lens can be reasonably controlled, the optical total length of the optical lens is reduced, and system miniaturization is facilitated to be achieved.
In some optional embodiments, the optical lens satisfies the following conditional expression:
-2.0<R6/R5<-1.0；（7）
where R5 denotes a radius of curvature of the object-side surface of the third lens, and R6 denotes a radius of curvature of the image-side surface of the third lens.
When the conditional expression (7) is satisfied, the curvature radius of the third lens can be reasonably controlled, the turning trend of light rays is slowed down, and the distortion and the aberration of an off-axis field of view can be corrected.
In some optional embodiments, the optical lens satisfies the following conditional expression:
0.5<R7/R8<0.7；（8）
where R7 denotes a radius of curvature of the object-side surface of the fourth lens, and R8 denotes a radius of curvature of the image-side surface of the fourth lens.
When the conditional expression (8) is satisfied, the surface type of the fourth lens can be reasonably controlled, the angles of the light rays entering the object side surface and the light rays exiting the image side surface of the fourth lens are reduced, the sensitivity of the fourth lens is favorably reduced, the production yield of the optical lens is improved, and meanwhile, the reduction of the calibers of subsequent lenses is favorably realized.
In some optional embodiments, the optical lens satisfies the following conditional expression:
0.85<CT4/CT5<0.95；（9）
where CT4 denotes the center thickness of the fourth lens and CT5 denotes the center thickness of the fifth lens.
When the conditional expression (9) is satisfied, the central thicknesses of the fourth lens and the fifth lens can be reasonably distributed, and the imaging quality of the optical lens can be improved.
In some optional embodiments, the optical lens satisfies the following conditional expression:
-1.5<R9/f<-1.2；（10）
where R9 denotes a radius of curvature of the object side surface of the fifth lens, and f denotes a focal length of the optical lens.
When the conditional expression (10) is satisfied, the bending degree of the object side surface of the fifth lens can be reasonably controlled, the light condensation intensity of the off-axis field is alleviated, the aberration of the off-axis field and the central field is reduced, and the imaging quality of the optical lens is improved.
In some optional embodiments, the optical lens satisfies the following conditional expression:
8<R11/R12<10；（11）
where R11 denotes a radius of curvature of the object-side surface of the sixth lens, and R12 denotes a radius of curvature of the image-side surface of the sixth lens. And the conditional expression (11) is satisfied, the surface type and the focal length of the sixth lens can be reasonably controlled, the total length of the optical lens is favorably reduced, and the spherical aberration and the distortion of the optical lens are favorably corrected.
In some optional embodiments, the optical lens satisfies the following conditional expression:
0.7<CT56/CT45<0.8；（12）
where CT45 denotes a distance on the optical axis of the fourth lens and the fifth lens, and CT56 denotes a distance on the optical axis of the fifth lens and the sixth lens.
When the conditional expression (12) is satisfied, the air space on the optical axis between the adjacent lenses from the fourth lens to the sixth lens can be reasonably controlled, which is beneficial to reducing the sensitivity of the optical lens.
In some optional embodiments, the optical lens satisfies the following conditional expression:
-3.3<f7<0；（13）
where f7 denotes a focal length of the seventh lens.
When the conditional expression (13) is satisfied, the focal length of the seventh lens can be reasonably controlled, so that the emergent angle of the main light ray is reasonably controlled, the light flux is maintained, and the relative illumination of the optical lens is favorably improved.
In an embodiment, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens may be aspheric lenses, and optionally, the first lens is a glass aspheric lens, and the other lenses are plastic aspheric lenses. By adopting the aspheric lens, the number of the lenses can be effectively reduced, aberration can be corrected, and better optical performance can be provided.
In this embodiment, as an implementation manner, when each lens in the optical lens is an aspheric lens, each aspheric surface shape of the optical lens may satisfy the following equation:
where z is a distance rise from the aspheric vertex at a position having a height h in the optical axis direction, c is a paraxial curvature of the surface, k is a conic coefficient, and A2i is an aspheric surface type coefficient of order 2 i.
The optical lens provided by the embodiment of the invention adopts seven lenses with specific refractive power, and through reasonably matching the lens shapes and the focal power combination among the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens, the structure of the optical lens is more compact on the premise that the lens has high pixels, the miniaturization of the lens and the balance of the high pixels are better realized, and the shooting experience of a user can be effectively improved.
The invention is further illustrated below in the following examples. In the following embodiments, the thickness, the curvature radius, and the material selection of each lens in the optical lens are different, and specific differences can be referred to in the parameter tables of the embodiments. In each table, R represents a radius of curvature (unit: mm), d represents an optical surface pitch (unit: mm), Nd represents a d-line refractive index of the material, and Vd represents an Abbe number of the material.
First embodiment
Referring to fig. 1, a schematic structural diagram of an optical lens 100 according to a first embodiment of the present invention is shown, where the optical lens 100 sequentially includes, from an object side to an image plane along an optical axis: the lens system includes a stop ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.
The first lens L1 has positive focal power, the object-side surface of the first lens L1 is convex, and the image-side surface of the first lens L1 is concave;
the second lens L2 has positive focal power, the object-side surface of the second lens L2 is convex, and the image-side surface of the second lens L2 is concave;
the third lens element L3 has negative power, the object-side surface of the third lens element L3 is concave at the paraxial region, and the image-side surface of the third lens element L3 is concave;
the fourth lens element L4 has positive optical power, the object-side surface of the fourth lens element L4 is convex at the paraxial region, and the image-side surface of the fourth lens element L4 is concave at the paraxial region;
the fifth lens L5 has negative focal power, the object-side surface of the fifth lens L5 is concave, and the image-side surface of the fifth lens L5 is convex;
the sixth lens L6 has positive refractive power, the object-side surface of the sixth lens L6 is concave, and the image-side surface of the sixth lens L6 is convex;
the seventh lens L7 has a negative power, the object-side surface of the seventh lens L7 is concave at the paraxial region, and the image-side surface of the seventh lens L7 is concave at the paraxial region;
the relevant parameters of each lens in the optical lens 100 provided in the first embodiment of the present invention are shown in table 1.
TABLE 1
In the present embodiment, the surface type coefficients of the aspheric surfaces of the optical lens 100 are shown in table 2:
TABLE 2
Referring to fig. 2, fig. 3, fig. 4 and fig. 5, an astigmatism graph, a distortion graph, a vertical axis chromatic aberration graph and an axial chromatic aberration graph of the optical lens 100 are respectively shown.
The astigmatism curve of fig. 2 indicates the degree of curvature of the meridional image plane and the sagittal image plane. In fig. 2, the horizontal axis represents the offset amount (unit: mm) and the vertical axis represents the angle of view (unit: degree). As can be seen from fig. 2, astigmatism of the meridional image plane and the sagittal image plane is controlled to be within ± 0.15 mm, which indicates that the astigmatism correction of the optical lens 100 is good.
Figure 3 distortion curves represent the distortion at different image heights on the imaging plane. In fig. 3, the horizontal axis represents the f- θ distortion percentage, and the vertical axis represents the angle of view (unit: degree). As can be seen from fig. 3, the optical distortion at different image heights on the image plane S15 is controlled within 2%, which indicates that the distortion of the optical lens 100 is well corrected.
The vertical axis chromatic aberration curve of fig. 4 shows chromatic aberration at different image heights on the image forming surface S15 for each wavelength with respect to the center wavelength (0.55 μm). In fig. 4, the horizontal axis represents the homeotropic color difference (unit: μm) of each wavelength with respect to the center wavelength, and the vertical axis represents the normalized angle of view. As can be seen from fig. 4, the vertical axis chromatic aberration of the longest wavelength (0.65 μm) and the shortest wavelength (0.47 μm) is controlled within ± 1.5 μm, which indicates that the optical lens 100 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
The axial chromatic aberration curve of fig. 5 represents the aberration on the optical axis at the imaging plane. In fig. 5, the vertical axis represents the normalized pupil radius, and the horizontal axis represents the axial chromatic aberration value (unit: mm). As can be seen from fig. 5, the shift amount of the axial chromatic aberration of the dominant wavelength (0.55 μm) is controlled within ± 0.015 mm, which indicates that the axial chromatic aberration of the optical lens 100 is well corrected.
Second embodiment
Referring to fig. 6, a schematic structural diagram of an optical lens 200 according to a second embodiment of the invention is shown. The optical lens 200 according to the second embodiment of the present invention has substantially the same structure as the optical lens 100 according to the first embodiment, but the difference is mainly in the radius of curvature and material selection of each lens.
The parameters related to each lens in the optical lens 200 provided in this embodiment are shown in table 3.
TABLE 3
The surface shape coefficients of the aspheric surfaces of the optical lens 200 provided in the present embodiment are shown in table 4:
TABLE 4
Referring to fig. 7, 8, 9 and 10, an astigmatism graph, a distortion graph, a vertical axis chromatic aberration graph and an axial chromatic aberration graph of the optical lens 200 are shown, respectively.
Fig. 7 shows the degree of curvature of the meridional image plane and the sagittal image plane. As can be seen from fig. 7, astigmatism of the meridional image plane and the sagittal image plane is controlled to be within ± 0.2 mm, which indicates that the astigmatism correction of the optical lens 200 is good.
Fig. 8 shows distortion at different image heights on the image forming surface S15. As can be seen from fig. 8, the optical distortion at different image heights on the image plane S15 is controlled to be within 2%, which indicates that the distortion of the optical lens 200 is well corrected.
Fig. 9 shows chromatic aberration at different image heights on the image forming surface S15 for the longest wavelength and the shortest wavelength. As can be seen from fig. 9, the vertical axis chromatic aberration of the longest wavelength (0.65 μm) and the shortest wavelength (0.47 μm) is controlled within ± 1.5 μm, which indicates that the optical lens 200 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Fig. 10 shows aberrations on the optical axis at the imaging plane. As can be seen from fig. 10, the shift amount of the axial chromatic aberration of the dominant wavelength (0.55 μm) is controlled within ± 0.015 mm, which indicates that the axial chromatic aberration of the optical lens 200 is well corrected.
Third embodiment
Referring to fig. 11, which is a schematic structural diagram of an optical lens 300 according to the present embodiment, an optical lens 300 according to a third embodiment of the present invention has substantially the same structure as the optical lens 100 according to the first embodiment, and mainly differs in the radius of curvature and material selection of each lens.
The parameters related to each lens of the optical lens 300 provided in this embodiment are shown in table 5.
TABLE 5
The surface shape coefficients of the aspherical surfaces of the optical lens 300 in the present embodiment are shown in table 6:
TABLE 6
Referring to fig. 12, 13, 14 and 15, an astigmatism graph, a distortion graph, a vertical axis chromatic aberration graph and an axial chromatic aberration graph of the optical lens 300 are shown, respectively.
Fig. 12 shows the degree of curvature of the meridional image plane and the sagittal image plane. As can be seen from fig. 12, astigmatism in the meridional image plane and the sagittal image plane is controlled to be within ± 0.15 mm, which indicates that the astigmatism correction of the optical lens 300 is good.
Fig. 13 shows distortion at different image heights on the image forming surface S15. As can be seen from fig. 13, the optical distortion at different image heights on the image plane S15 is controlled to be within 2%, which indicates that the distortion of the optical lens 300 is well corrected.
Fig. 14 shows the chromatic aberration at different image heights on the image forming surface S15 for the longest wavelength and the shortest wavelength. As can be seen from fig. 14, the vertical axis chromatic aberration of the longest wavelength (0.65 μm) and the shortest wavelength (0.47 μm) is controlled within ± 2 μm, which indicates that the optical lens 300 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Fig. 15 shows aberrations on the optical axis at the imaging plane. As can be seen from fig. 15, the shift amount of the axial chromatic aberration of the dominant wavelength (0.55 μm) is controlled within ± 0.015 mm, which indicates that the axial chromatic aberration of the optical lens 300 is well corrected.
Referring to table 7, optical characteristics corresponding to the optical lenses provided in the three embodiments are shown. The optical characteristics mainly include a focal length F, an F # of the optical lens, an entrance pupil diameter EPD, a total optical length TTL, and a field angle 2 θ, and a correlation value corresponding to each of the aforementioned conditional expressions.
TABLE 7
In summary, the optical lens provided by the embodiment of the invention has the following advantages:
(1) the diaphragm and each lens are reasonably arranged, so that the outer diameter of the head of the lens can be smaller, and the requirement of high screen ratio is met; on the other hand, the total length of the optical lens is shorter (TTL <6 mm), the volume is reduced, and the development trend of light weight and thinness of portable intelligent electronic products such as mobile phones can be better met.
(2) 1 glass aspheric lens with specific refractive power is combined with 6 plastic aspheric lenses, and each lens is matched with a specific surface shape, so that the optical lens has ultrahigh pixel imaging quality, and the invention can be matched with a 4800 ten thousand pixel chip.
(3) The field angle of the optical lens can reach 85 degrees, the optical distortion can be effectively corrected, the optical distortion is controlled to be less than 2 percent, and the requirements of large field angle and high-definition imaging can be met.
The fourth embodiment of the present invention also provides an imaging apparatus including an imaging element and the optical lens (e.g., optical lens) in any of the embodiments described above. The imaging element may be a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and may also be a CCD (Charge Coupled Device) image sensor.
The imaging device can be a camera, a mobile terminal and any electronic device with an optical lens, and the mobile terminal can be a terminal device such as a smart phone, a smart tablet, a smart reader and the like.
The imaging device that this application embodiment provided includes optical lens, because optical lens has that the head external diameter is little, wide visual angle, the high advantage of imaging quality, and imaging device who has this optical lens also has that the head external diameter is little, wide visual angle, the high advantage of imaging quality.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed 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 (12)
1. An optical lens system comprising seven lens elements, comprising, in order from an object side to an image plane along an optical axis:
a diaphragm;
the lens comprises a first lens with positive focal power, a second lens and a third lens, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens is provided with 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 concave surface;
a third lens having a negative optical power, an object-side surface of the third lens being concave at a paraxial region, an image-side surface of the third lens being concave;
a fourth lens having a positive optical power, an object-side surface of the fourth lens being convex at a paraxial region, an image-side surface of the fourth lens being concave at a paraxial region;
the lens comprises a fifth lens with negative focal power, wherein the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface;
the sixth lens is provided with positive focal power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface;
a seventh lens having a negative optical power, an object side surface of the seventh lens being concave at a paraxial region, an image side surface of the seventh lens being concave at a paraxial region;
the first lens is a glass aspheric lens, and the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are plastic aspheric lenses;
the optical lens satisfies the following conditional expression:
-2.5＜f3/f＜-2.0；
wherein f denotes a focal length of the optical lens, and f3 denotes a focal length of the third lens;
the optical lens satisfies the conditional expression: 0.05< f/(f2+ f3) <0.1, -4< f34/f < -3;
wherein f2 denotes a focal length of the second lens, f3 denotes a focal length of the third lens, and f34 denotes a focal length of a combination of the third lens and the fourth lens.
2. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: 0.1< ND3-ND2< 0.2;
where ND2 denotes a refractive index of the second lens, and ND3 denotes a refractive index of the third lens.
3. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: 0< f1/f2< 0.1;
wherein f1 denotes a focal length of the first lens, and f2 denotes a focal length of the second lens.
4. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: 0.7< R3/R4< 0.85;
wherein R3 denotes a radius of curvature of an object side surface of the second lens, and R4 denotes a radius of curvature of an image side surface of the second lens.
5. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: -2.0< R6/R5< -1.0;
wherein R5 denotes a radius of curvature of an object-side surface of the third lens, and R6 denotes a radius of curvature of an image-side surface of the third lens.
6. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: 0.5< R7/R8< 0.7;
wherein R7 denotes a radius of curvature of an object-side surface of the fourth lens, and R8 denotes a radius of curvature of an image-side surface of the fourth lens.
7. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: 0.85< CT4/CT5< 0.95;
wherein CT4 represents the center thickness of the fourth lens and CT5 represents the center thickness of the fifth lens.
8. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: -1.5< R9/f < -1.2;
where R9 denotes a radius of curvature of an object side surface of the fifth lens, and f denotes a focal length of the optical lens.
9. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: 8< R11/R12< 10;
wherein R11 denotes a radius of curvature of an object-side surface of the sixth lens, and R12 denotes a radius of curvature of an image-side surface of the sixth lens.
10. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: 0.70< CT56/CT45< 0.8;
wherein CT45 denotes a distance on the optical axis of the fourth lens and the fifth lens, and CT56 denotes a distance on the optical axis of the fifth lens and the sixth lens.
11. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: -3.3< f7< 0;
where f7 denotes a focal length of the seventh lens.
12. An imaging apparatus comprising an optical lens according to any one of claims 1 to 11 and an imaging element for converting an optical image formed by the optical lens into an electric signal.
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