CN113703135A - High-pixel large-target-surface large-aperture wide-angle forward-looking optical system and camera module applying same - Google Patents
High-pixel large-target-surface large-aperture wide-angle forward-looking optical system and camera module applying same Download PDFInfo
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- CN113703135A CN113703135A CN202111023752.6A CN202111023752A CN113703135A CN 113703135 A CN113703135 A CN 113703135A CN 202111023752 A CN202111023752 A CN 202111023752A CN 113703135 A CN113703135 A CN 113703135A
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- 238000001514 detection method Methods 0.000 description 6
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The embodiment of the invention discloses a high-pixel large-target-surface large-aperture wide-angle foresight optical system, which sequentially comprises the following components from an object plane to an image plane along an optical axis: 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 and the second lens are both convex on the object plane side and concave on the image plane side, and the focal power is negative; the object plane side of the third lens is a plane or a concave surface, the image plane side of the third lens is a convex surface, and the focal power of the third lens is positive; the fourth lens is a biconvex lens, and the focal power of the fourth lens is positive; the fifth lens and the sixth lens are mutually glued to form a combined lens, and the focal power of the combined lens is positive; the seventh lens element has a concave object surface side and a convex image surface side, and has positive refractive power. On the other hand, the embodiment of the invention also provides a camera module. The embodiment of the invention mainly comprises 7 lenses, has reasonable number of lenses and simple structure, has the traditional advantages of low cost, easy processing and the like, and can be used for detecting the forward-looking wide-angle close-range object of the automobile.
Description
The technical field is as follows:
the invention relates to an optical system and a camera module applied by the same, in particular to a high-pixel large-target-surface large-aperture wide-angle forward-looking optical system and a camera module applied by the same.
Background art:
at present, abnormal fire and heat in the field of automatic driving of automobiles have more and more requirements on imaging optical systems related to system distance measurement. For a wide-angle lens, as the angle increases, the compression of peripheral distortion causes the pixel density of the lens in the peripheral field to be smaller and smaller, and the object detection distance in the peripheral field of the lens is reduced. In order to solve the above problems, most manufacturers propose different solutions, but all have the defects of complex structure and high cost.
The invention content is as follows:
in order to solve the problems of complex structure and high cost of the conventional optical system, the embodiment of the invention provides a high-pixel large-target-surface large-aperture wide-angle forward-looking optical system on the one hand.
A high-pixel large-target-surface large-aperture wide-angle forward-looking optical system sequentially comprises the following components from an object plane to an image plane along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens;
the object surface side of the first lens is a convex surface, the image surface side of the first lens is a concave surface, and the focal power of the first lens is negative;
the object surface side of the second lens is a convex surface, the image surface side of the second lens is a concave surface, and the focal power of the second lens is negative;
the object plane side of the third lens is a plane or a concave surface, the image plane side of the third lens is a convex surface, and the focal power of the third lens is positive;
the object surface side of the fourth lens is a convex surface, the image surface side of the fourth lens is a convex surface, and the focal power of the fourth lens is positive;
the fifth lens and the sixth lens are mutually glued to form a combined lens, and the focal power of the combined lens is positive;
the seventh lens element has a concave object surface side and a convex image surface side, and has positive refractive power.
On the other hand, the embodiment of the invention also provides a camera module.
A camera module at least comprises an optical lens, wherein the high-pixel large-target-surface large-aperture wide-angle forward-looking optical system is arranged in the optical lens.
The optical system and the camera module of the embodiment of the invention mainly comprise 7 lenses, and have the advantages of reasonable number of lenses, simple structure, low cost, easy processing and the like. Meanwhile, different lenses are combined with each other, the focal power is reasonably distributed, the aberration is optimized, the temperature characteristic is excellent (-40 ℃ to +105 ℃), and the use of a chip with more than 8 million pixels can be met. In addition, the method has excellent distortion correction characteristics, so that the whole pixel density is uniform, and the object detection distance of the peripheral field of view is increased. And the invention also has good performances of large target surface, large aperture, high resolving power, high reliability, excellent temperature characteristic and the like, and can be used for detecting the forward-looking wide-angle close-range object of the automobile.
Description of the drawings:
in order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a first schematic structural diagram of a lens optical system or a camera module according to an embodiment of the present invention;
FIG. 2 is a graph of relative illumination of a lens system or camera module according to an embodiment of the present invention;
FIG. 3 is a CRA chart of an embodiment of a lens optical system or camera module of the present invention;
fig. 4 (i.e., fig. 4(1) to fig. 4 (12)) are Ray Fan graphs of the lens optical system or the camera module according to the embodiment of the present invention.
The specific implementation mode is as follows:
in order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
When embodiments of the present invention refer to the ordinal numbers "first", "second", etc., it should be understood that the words are used for distinguishing between them unless the context clearly dictates otherwise.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
A high-pixel large-target-surface large-aperture wide-angle forward-looking optical system sequentially comprises the following components from an object plane to an image plane along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens.
The object surface side of the first lens is a convex surface, the image surface side of the first lens is a concave surface, and the focal power of the first lens is negative;
the object surface side of the second lens is a convex surface, the image surface side of the second lens is a concave surface, and the focal power of the second lens is negative;
the object plane side of the third lens is a plane or a concave surface, the image plane side of the third lens is a convex surface, and the focal power of the third lens is positive;
the object surface side of the fourth lens is a convex surface, the image surface side of the fourth lens is a convex surface, and the focal power of the fourth lens is positive;
the fifth lens and the sixth lens are mutually glued to form a combined lens, and the focal power of the combined lens is positive;
the seventh lens element has a concave object surface side and a convex image surface side, and has positive refractive power.
The optical system and the camera module of the embodiment of the invention mainly comprise 7 lenses, and have the advantages of reasonable number of lenses, simple structure, low cost, easy processing and the like. Meanwhile, different lenses are combined with each other, the focal power is reasonably distributed, the aberration is optimized, the temperature characteristic is excellent (-40 ℃ to +105 ℃), and the use of a chip with more than 8 million pixels can be met. In addition, the method has excellent distortion correction characteristics, so that the whole pixel density is uniform, and the object detection distance of the peripheral field of view is increased. And the invention also has good performances of large target surface, large aperture, high resolving power, high reliability, excellent temperature characteristic and the like, and can be used for detecting the forward-looking wide-angle close-range object of the automobile.
Further, as a preferred embodiment of the present invention, without limitation, the optical system satisfies the following conditions:
∣f2/f7∣＜0.95；
f4/f＞2；
f7/f＞4；
where f is the focal length of the entire optical system, f2 is the focal length of the second lens, f4 is the focal length of the fourth lens, and f7 is the focal length of the seventh lens. Different lenses are combined with each other and the focal power is reasonably distributed, the aberration is optimized, the temperature characteristic is excellent (-40 ℃ to +105 ℃), and the use of a chip with more than 8 million pixels can be met. In addition, the method has excellent distortion correction characteristics, so that the whole pixel density is uniform, and the object detection distance of the peripheral field of view is increased. The invention has good performances of large target surface, large aperture, high resolving power, high reliability, excellent temperature characteristic and the like.
Further, as a preferred embodiment of the present invention, but not limited thereto, a ratio of the focal length f2 of the second lens to the focal length f7 of the seventh lens satisfies the following condition: | f2/f7 | < 0.95. Simple structure and can ensure good optical performance.
Further, as a preferred embodiment of the present invention, but not limited thereto, a ratio of the focal length f4 of the fourth lens to the system focal length f satisfies the following condition: f4/f > 2. Simple structure and can ensure good optical performance.
Further, as a preferred embodiment of the present invention, but not limited thereto, a ratio of the focal length f7 of the seventh lens to the system focal length f satisfies the following condition: f7/f > 4. Simple structure and can ensure good optical performance.
Further, as a preferred embodiment of the present invention, but not limited thereto, the refractive index Nd1 of the material, the abbe constant Vd1 of the material, and the hardness HK1 of the first lens satisfy: 1.69< Nd1<2.1, 28< Vd1<57, Hk1> 650. Simple structure and can ensure good optical performance.
Further, as a preferred embodiment of the present invention, but not limited thereto, the refractive index Nd5 of the material and the abbe constant Vd5 of the material of the fifth lens satisfy: nd5 is more than or equal to 1.48 and less than or equal to 1.65, and Vd5 is more than or equal to 63. Simple structure and can ensure good optical performance.
Further, as a preferred embodiment of the present invention, but not limited thereto, a material abbe constant Vd5 of the fifth lens and a material abbe constant Vd6 of the sixth lens satisfy: | Vd5-Vd6| 16. Simple structure and can ensure good optical performance.
Further, as a preferred embodiment of the present invention, but not limited thereto, the seventh lens has a refractive index Nd7 of material and an abbe constant Vd7 of material satisfying: 1.42< Nd7<1.65, 61< Vd7< 95. Simple structure and can ensure good optical performance.
Further, as a preferred embodiment of the present invention, but not limited thereto, the horizontal direction field angle HFOV of the optical system satisfies: 100 DEG < HFOV < 130 deg. Simple structure and can ensure good optical performance.
Further, as a preferred embodiment of the present invention, but not limited thereto, a ratio of total optical length TTL of the optical system to system focal length f satisfies: TTL/f > 7. Simple structure and can ensure good optical performance.
Further, as a preferred embodiment of the present invention, but not limited thereto, an aperture stop of the optical system is disposed between the third lens and the fourth lens, on a side close to the fourth lens, for adjusting the intensity of the light beam.
Further, as a preferred embodiment of the present invention, but not limited thereto, the first lens, the third lens, the fifth lens, and the sixth lens are all glass lenses, which can ensure long-term reliability and service life of the lens, and ensure accuracy of the algorithm.
Further, as a preferred embodiment of the present invention, the second lens, the fourth lens, and the seventh lens are all glass aspherical lenses. The optical configuration of the glass and the glass aspheric surface is adopted, the position of the glass aspheric surface is reasonably selected, and the lens aberration is optimized.
Further, as a preferred embodiment of the present invention, without limitation, as shown in fig. 1, the effective focal length F of the optical system is 3.6mm, the stop index F/NO is 1.6, the horizontal field angle HFOV is 122 °, and the total optical length TTL is 30.6 mm. Specifically, the basic parameters of the optical system are shown in the following table:
in the above table, S1, S2 correspond to two surfaces of the first lens 1 from the object plane to the image plane 9 along the optical axis; s3, S4 correspond to both surfaces of the second lens 2; s5, S6 correspond to both surfaces of the third lens 3; STO is the position of the diaphragm 8; s8, S9 correspond to both surfaces of the fourth lens 4; s10, S11 correspond to both surfaces of the fifth lens 5; s11, S12 correspond to both surfaces of the sixth lens 6; s13, S14 correspond to both surfaces of the seventh lens 7; IMA is the image plane 9.
Further, as a preferred embodiment of the present invention, the second lens 2, the fourth lens 4, and the seventh lens 7 are glass aspherical lenses, not being limitative. It satisfies the following equation:
wherein, the parameter c is 1/R, namely the curvature corresponding to the radius, y is a radial coordinate, the unit of which is the same as the unit of the length of the lens, k is a conic coefficient, a1To a8The coefficients are respectively corresponding to the radial coordinates. The aspheric correlation values of the second lens element 2, the fourth lens element 4, and the seventh lens element 7 are shown in the following table:
| K | α1 | α2 | α3 | α4 | α5 | α6 | α7 | |
| S3 | 30.06 | 0 | 3.8E-03 | -3.8E-04 | 2.3E-05 | -1.2E-06 | 4.2E-08 | -6.5E-10 |
| S4 | -1.10 | 0 | 5.5E-03 | -4.3E-04 | 2.6E-05 | -2.3E-06 | 1.6E-07 | -6.3E-09 |
| S8 | 6.83 | 0 | 5.6E-04 | 7.4E-07 | -1.3E-06 | 7.9E-08 | -3.5E-09 | 0 |
| S9 | 2.71 | 0 | 6.9E-04 | 7.3E-06 | -4.0E-07 | 3.0E-08 | -1.4E-09 | 0 |
| |
0 | 0 | -2.1E-03 | -2.8E-04 | 4.9E-05 | -8.3E-06 | 6.8E-07 | -2.7E-08 |
| S14 | -2.21 | 0 | -2.0E-04 | -2.2E-04 | 3.4E-05 | -4.5E-06 | 3.2E-07 | -1.2E-08 |
as can be seen from FIGS. 2 to 4 (i.e., FIGS. 4(1) to 4 (12)), the optical system of the present embodiment has excellent temperature characteristics (-40 ℃ to +105 ℃), and can satisfy the use of chips with 8 megapixels or more. In addition, the method has excellent distortion correction characteristics, so that the whole pixel density is uniform, and the object detection distance of the peripheral field of view is increased. The invention has good performances of large target surface, large aperture, high resolving power, high reliability, excellent temperature characteristic and the like.
A camera module at least comprises an optical lens, wherein the high-pixel large-target-surface large-aperture wide-angle forward-looking optical system is arranged in the optical lens.
The optical system and the camera module of the embodiment of the invention mainly comprise 7 lenses, and have the advantages of reasonable number of lenses, simple structure, low cost, easy processing and the like. Meanwhile, different lenses are combined with each other, the focal power is reasonably distributed, the aberration is optimized, the temperature characteristic is excellent (-40 ℃ to +105 ℃), and the use of a chip with more than 8 million pixels can be met. In addition, the method has excellent distortion correction characteristics, so that the whole pixel density is uniform, and the object detection distance of the peripheral field of view is increased. And the invention also has good performances of large target surface, large aperture, high resolving power, high reliability, excellent temperature characteristic and the like, and can be used for detecting the forward-looking wide-angle close-range object of the automobile.
The foregoing is illustrative of one or more embodiments provided in connection with the detailed description and is not intended to limit the practice of the invention to the particular forms disclosed. Similar or identical methods, structures and the like as those of the present invention or several technical deductions or substitutions made on the premise of the conception of the present invention should be considered as the protection scope of the present invention.
Claims (10)
1. A high-pixel large-target-surface large-aperture wide-angle forward-looking optical system sequentially comprises the following components from an object plane to an image plane along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens; it is characterized in that the preparation method is characterized in that,
the object surface side of the first lens is a convex surface, the image surface side of the first lens is a concave surface, and the focal power of the first lens is negative;
the object surface side of the second lens is a convex surface, the image surface side of the second lens is a concave surface, and the focal power of the second lens is negative;
the object plane side of the third lens is a plane or a concave surface, the image plane side of the third lens is a convex surface, and the focal power of the third lens is positive;
the object surface side of the fourth lens is a convex surface, the image surface side of the fourth lens is a convex surface, and the focal power of the fourth lens is positive;
the fifth lens and the sixth lens are mutually glued to form a combined lens, and the focal power of the combined lens is positive;
the seventh lens element has a concave object surface side and a convex image surface side, and has positive refractive power.
2. The high-pixel large-target-surface large-aperture wide-angle forward-looking optical system of claim 1, wherein the optical system satisfies the following conditions:
∣f2/f7∣＜0.95；
f4/f＞2；
f7/f＞4；
where f is the focal length of the entire optical system, f2 is the focal length of the second lens, f4 is the focal length of the fourth lens, and f7 is the focal length of the seventh lens.
3. The high-pixel large-target-surface large-aperture wide-angle forward-looking optical system of claim 1, wherein a ratio of a focal length f2 of the second lens to a focal length f7 of the seventh lens satisfies the following condition: | f2/f7 | < 0.95.
4. The high-pixel large-target-surface large-aperture wide-angle forward-looking optical system of claim 1, wherein the ratio of the focal length f4 of the fourth lens to the system focal length f satisfies the following condition: f4/f > 2.
5. The high-pixel large-target-surface large-aperture wide-angle forward-looking optical system of claim 1, wherein the ratio of the focal length f7 of the seventh lens to the system focal length f satisfies the following condition: f7/f > 4.
6. The high-pixel large-target-surface large-aperture wide-angle forward-looking optical system as claimed in claim 1, wherein the refractive index Nd1 of the material, the Abbe constant Vd1 of the material and the hardness HK1 of the first lens satisfy: 1.69< Nd1<2.1, 28< Vd1<57, Hk1> 650.
7. The high-pixel large-target-surface large-aperture wide-angle forward-looking optical system as claimed in claim 1, wherein the refractive index Nd5 of the material and the Abbe constant Vd5 of the material of the fifth lens satisfy: nd5 is more than or equal to 1.48 and less than or equal to 1.65, and Vd5 is more than or equal to 63.
8. The high-pixel large-target-surface large-aperture wide-angle forward-looking optical system as claimed in claim 1, wherein the abbe constant Vd5 of the material of the fifth lens and the abbe constant Vd6 of the material of the sixth lens satisfy: | Vd5-Vd6| 16.
9. The high-pixel large-target-surface large-aperture wide-angle forward-looking optical system as claimed in claim 1, wherein the refractive index Nd7 of the material and the abbe constant Vd7 of the material of the seventh lens satisfy: 1.42< Nd7<1.65, 61< Vd7< 95.
10. A camera module, at least comprising an optical lens, wherein the optical lens is provided with the high-pixel large-target-surface large-aperture wide-angle forward-looking optical system as claimed in any one of claims 1 to 9.
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