CN114035302A - Small-size ultra-wide-angle day and night dual-purpose optical system - Google Patents

Small-size ultra-wide-angle day and night dual-purpose optical system Download PDF

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Publication number
CN114035302A
CN114035302A CN202111236685.6A CN202111236685A CN114035302A CN 114035302 A CN114035302 A CN 114035302A CN 202111236685 A CN202111236685 A CN 202111236685A CN 114035302 A CN114035302 A CN 114035302A
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lens
optical system
small
surface side
night
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CN114035302B (en
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席爱平
李岳璁
林勝龙
尹小玲
赵治平
杨文冠
刘洪海
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Guangdong Hongjing Optoelectronics Technology Co Ltd
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Guangdong Hongjing Optoelectronics Technology Co Ltd
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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
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
    • H04N7/183—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a single remote source
    • H04N7/186—Video door telephones

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Lenses (AREA)

Abstract

The embodiment of the invention discloses a small-size super-wide-angle day and night dual-purpose 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 object plane sides of the first lens and the seventh lens are both convex surfaces, the image plane sides of the first lens and the seventh lens are both concave surfaces, and the focal powers of the first lens and the seventh lens are both negative; the object surface side of the second lens is a concave surface, the image surface side is a convex surface, and the focal power of the second lens is positive; the object plane side of the third lens is a concave surface, the image plane side of the third lens is a convex surface, and the focal power of the third lens is negative; the fifth lens is a biconcave lens, and the focal power of the fifth lens is negative; the fourth lens and the sixth lens are biconvex lenses, and the focal power of the biconvex lenses is positive. The optical system of the embodiment of the invention mainly comprises 7 lenses, has reasonable number of lenses, simple structure and small volume, is beneficial to pursuing miniaturization of products, and is suitable for intelligent doorbells or intelligent home systems.

Description

Small-size ultra-wide-angle day and night dual-purpose optical system
The technical field is as follows:
the invention relates to an optical system, in particular to a small-size ultra-wide-angle day and night dual-purpose optical system.
Background art:
at present, the module of making a video recording is by the wide application in intelligent home systems like visual doorbell product, and there is the defect that the structure is complicated, bulky, the visual angle is little, the pixel is low, day night effect is poor in the module of making a video recording or optical system in the past, hardly satisfies the demand of using.
The invention content is as follows:
in order to solve the problems of complex structure and large volume of the existing optical system or camera module, the embodiment of the invention provides a small-volume ultra-wide-angle day and night dual-purpose optical system on the one hand.
A small-size ultra-wide-angle day and night dual-purpose optical system sequentially comprises 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 concave surface, the image surface side is a convex surface, and the focal power of the second lens is positive;
the object plane side of the third lens is a concave surface, the image plane side of the third lens is a convex surface, and the focal power of the third lens is negative;
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 object plane side of the fifth lens is a concave surface, the image plane side of the fifth lens is a concave surface, and the focal power of the fifth lens is negative;
the object surface side of the sixth lens is a convex surface, the image surface side is a convex surface, and the focal power of the sixth lens is positive;
the seventh lens element has a convex object surface side and a concave image surface side, and has negative refractive power.
The optical system of the embodiment of the invention mainly comprises 7 lenses, has reasonable number of lenses, simple structure and small volume, and is beneficial to pursuing miniaturization of products. Meanwhile, different lenses are combined with each other, focal power is reasonably distributed, aberration is balanced, excellent temperature characteristics are guaranteed, meanwhile, ultra-short TTL and a large visual angle are achieved, a sufficient visual field range is guaranteed, virtual focus is avoided at daytime and at night, and the intelligent doorbell or the intelligent home system is suitable for.
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 schematic diagram of a lens optical system according to an embodiment of the present invention;
FIG. 2 is a graph of the visible light MTF of an embodiment of the lens optics of the present invention;
FIG. 3 is a graph of an infrared ray MTF of an embodiment of a lens optical system of the present invention;
fig. 4 is a distortion plot of an embodiment of the lens optics 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 small-size ultra-wide-angle day and night dual-purpose optical system sequentially comprises from an object plane to an image plane along an optical axis: a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, and a seventh lens 7.
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 concave surface, the image surface side is a convex surface, and the focal power of the second lens is positive;
the object plane side of the third lens is a concave surface, the image plane side of the third lens is a convex surface, and the focal power of the third lens is negative;
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 object plane side of the fifth lens is a concave surface, the image plane side of the fifth lens is a concave surface, and the focal power of the fifth lens is negative;
the object surface side of the sixth lens is a convex surface, the image surface side is a convex surface, and the focal power of the sixth lens is positive;
the seventh lens element has a convex object surface side and a concave image surface side, and has negative refractive power.
The optical system of the embodiment of the invention mainly comprises 7 lenses, has reasonable number of lenses, simple structure and small volume, and is beneficial to pursuing miniaturization of products. Meanwhile, different lenses are combined with each other, focal power is reasonably distributed, aberration is balanced, excellent temperature characteristics are guaranteed, meanwhile, ultra-short TTL and a large visual angle are achieved, a sufficient visual field range is guaranteed, virtual focus is avoided at daytime and at night, and the intelligent doorbell or the intelligent home system is suitable for.
Further, as a preferred embodiment of the present invention, without limitation, the optical system satisfies the following conditions:
2.72 < f2/f < 3.35; and/or
F4/f is more than 1.50 and less than 1.90; and/or
-1.62 < f5/f < -1.43; and/or
-13.5＜f7/f＜-9.2；
Where f is a focal length of the entire optical system, f2 is a focal length of the second lens, f4 is a focal length of the fourth lens, f5 is a focal length of the fifth lens, and f7 is a focal length of the seventh lens. Different lenses are mutually combined and reasonably distributed with focal power to balance aberration, so that excellent temperature characteristics are guaranteed, meanwhile, ultrashort TTL and a large visual angle are realized, a sufficient visual field range is guaranteed, and virtual focus is avoided at day and night.
Still further, as a preferred embodiment of the present invention, but not limited thereto, the horizontal direction field angle HFOV of the optical system satisfies: HFOV is more than or equal to 155 degrees. The super-large visual angle is realized while the excellent temperature characteristic is ensured, the sufficient visual field range is ensured, and the virtual focus is not generated at day and night.
Further, as a preferred embodiment of the present invention, but not limited thereto, the refractive index Nd1 of the material and the abbe constant Vd1 of the material of the first lens satisfy: nd1 is more than 1.75, and Vd1 is less than 53. Simple structure and can ensure good optical performance.
Still further, as a preferred embodiment of the present invention, but not limited thereto, the refractive index Nd4 of the material and the abbe constant Vd4 of the material of the fourth lens satisfy: nd4 is less than 1.60, and Vd4 is more than 70. Simple structure and can ensure good optical performance.
Still further, as a preferred embodiment of the present invention, but not limited thereto, the fifth lens has a refractive index Nd5 of material and an abbe constant Vd5 of material satisfying: nd5 is greater than 1.66, and Vd5 is less than 21. Simple structure and can ensure good optical performance.
Further, as a preferred embodiment of the present invention, but not limited thereto, the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens are plastic aspheric lenses. The position of the aspheric surface is reasonably selected to balance aberration.
Still further, as a preferred embodiment of the present invention, but not limited thereto, a diaphragm is disposed between the third lens and the fourth lens. For adjusting the intensity of the light beam.
Still further, as a preferred embodiment of the present invention, but not limiting thereto, the total optical length TTL satisfies: TTL is 13.0 mm. Simple structure and can ensure good optical performance.
Further, as a preferred embodiment of the present invention, without limiting the same, as shown in fig. 1, the effective focal length f of the optical system is 1.94mm, the horizontal field angle HFOV is 155 °, and the total optical length TTL is 13.0 mm. Specifically, the basic parameters of the optical system are shown in the following table:
surface of Radius of curvature R (mm) Spacing D (mm) Refractive index Nd Dispersion value Vd
S1 12.09 0.68 1.76 52.33
S2 2.33 2.06
S3 -5.42 1.07 1.66 20.37
S4 -2.48 0.12
S5 -2.15 1.09 1.54 55.98
S6 -4.18 0.52
STO Infinite size -0.16
S8 3.17 1.60 1.57 71.31
S9 -4.35 0.50
S10 -2.26 0.40 1.66 20.37
S11 17.89 0.06
S12 50.95 1.42 1.54 55.98
S13 -1.58 0.07
S14 5.36 1.10 1.54 55.98
S15 3.45 0.40
IMA Infinite size
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; s12, S13 correspond to both surfaces of the sixth lens 6; s14, S15 correspond to both surfaces of the seventh lens 7; IMA is the image plane 9.
Further, as a preferred embodiment of the present invention, but not limited thereto, the second lens 2, the third lens 3, the fifth lens 5, and the sixth lens 6 are plastic aspherical lenses. It satisfies the following even-order aspheric equation:
Figure BDA0003317882170000061
the seventh lens element 7 is also a plastic aspheric lens, but satisfies the following extended aspheric equation:
Figure BDA0003317882170000062
wherein, the parameter c is 1/R, namely the curvature corresponding to the radius, y or p 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 third lens element 3, the fifth lens element 5, and the sixth lens element 6 are shown in the following table:
K α1 α2 α3 α4 α5 α6 α7
S3 -5.00 0 3.6E-03 -1.7E-04 -4.8E-04 5.8E-07 2.9E-05 -3.7E-6
S4 -1.80 0 5.0E-02 -2.7E-02 7.9E-03 -1.1E-03 3.9E-05 -6.5E-07
S5 -1.30 0 7.0E-02 -5.0E-02 2.0E-02 -3.6E-03 -3.2E-04 2.1E-04
S6 -4.20 0 6.7E-03 -2.0E-02 2.0E-02 -1.4E-02 4.1E-03 -4.7E-04
S10 -3.60 0 -6.0E-02 3.5E-02 -2.0E-02 5.9E-03 -8.3E-04 0
S11 0 0 -2.0E-02 3.8E-03 3.7E-03 -1.7E-03 3.6E-04 -3.5E-05
S12
0 0 9.3E-03 -2.6E-02 1.9E-02 -4.7E-03 4.5E-04 -8.6E-06
S13 -0.50 0 5.0E-02 -1.0E-02 1.0E-02 -7.23E-03 3.0E-03 -5.8E-04
S14
0 0 -2.5E-02 1.3E-02 -6.7E-03 2.6E-03 -6.5E-04 1.1E-04
S15
0 0 -9.4E-02 4.0E-02 -1.6E-02 5.2E-03 -1.2E-03 1.8E-04
the aspherical correlation values of the seventh lens 7 are shown in the following table:
K α1 α2 α3 α4 α5 α6 α7 α8 α9 α10
S14 0 0 -2.5E-02 1.3E-02 -6.7E-03 2.6E-03 -6.5E-04 1.1E-04 -1.2E-05 7.8E-07 -2.3E-08
S15
0 0 -9.4E-02 4.0E-02 -1.6E-02 5.2E-03 -1.2E-03 1.8E-04 -1.7E-05 9.1E-07 -2.1E-08
as can be seen from fig. 2 to 4, the optical system of the present embodiment realizes an ultra-short TTL and a large viewing angle while ensuring excellent temperature characteristics, ensures a sufficient viewing range, and is free from virtual focus during the day and night.
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 (9)

1. A small-size ultra-wide-angle day and night dual-purpose optical system sequentially comprises 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 concave surface, the image surface side is a convex surface, and the focal power of the second lens is positive;
the object plane side of the third lens is a concave surface, the image plane side of the third lens is a convex surface, and the focal power of the third lens is negative;
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 object plane side of the fifth lens is a concave surface, the image plane side of the fifth lens is a concave surface, and the focal power of the fifth lens is negative;
the object surface side of the sixth lens is a convex surface, the image surface side is a convex surface, and the focal power of the sixth lens is positive;
the seventh lens element has a convex object surface side and a concave image surface side, and has negative refractive power.
2. A small-sized ultra-wide angle day-and-night optical system as set forth in claim 1, wherein the optical system satisfies the following condition:
2.72 < f2/f < 3.35; and/or
F4/f is more than 1.50 and less than 1.90; and/or
-1.62 < f5/f < -1.43; and/or
-13.5＜f7/f＜-9.2；
Where f is a focal length of the entire optical system, f2 is a focal length of the second lens, f4 is a focal length of the fourth lens, f5 is a focal length of the fifth lens, and f7 is a focal length of the seventh lens.
3. The small-volume ultra-wide-angle day-night optical system according to claim 1, wherein the horizontal field angle HFOV of the optical system satisfies: HFOV is more than or equal to 155 degrees.
4. A small-volume ultra-wide angle day and night optical system as claimed in any one of claims 1 to 3, wherein the refractive index Nd1 of the material and the abbe constant Vd1 of the first lens satisfy: nd1 is more than 1.75, and Vd1 is less than 53.
5. A small-volume ultra-wide angle day and night optical system as claimed in any one of claims 1 to 3, wherein the refractive index Nd4 of the material and the abbe constant Vd4 of the material of the fourth lens satisfy: nd4 is less than 1.60, and Vd4 is more than 70.
6. A small-volume ultra-wide angle day and night optical system as claimed in any one of claims 1 to 3, wherein the refractive index Nd5 of the material and the abbe constant Vd5 of the fifth lens satisfy: nd5 is greater than 1.66, and Vd5 is less than 21.
7. A small-form factor, ultra-wide angle day and night optical system as claimed in any one of claims 1 to 3 wherein the second, third, fifth, sixth and seventh lenses are plastic aspheric lenses.
8. A small-volume ultra-wide angle day-night optical system as claimed in any one of claims 1 to 3, wherein a diaphragm is disposed between the third lens and the fourth lens.
9. A small-volume ultra-wide angle day-and-night optical system as claimed in any one of claims 1 to 3, wherein the total optical length TTL satisfies: TTL is 13.0 mm.
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CN211878291U (en) * 2019-12-31 2020-11-06 广东弘景光电科技股份有限公司 High-definition wide-angle day and night confocal optical system and camera module
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CN113406777A (en) * 2021-07-21 2021-09-17 厦门力鼎光电股份有限公司 Wide-angle lens
CN216870923U (en) * 2021-10-23 2022-07-01 广东弘景光电科技股份有限公司 Small-size ultra-wide-angle day and night dual-purpose optical system and camera module applying same

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107490841A (en) * 2017-09-21 2017-12-19 浙江舜宇光学有限公司 Imaging lens system group
JP6530518B1 (en) * 2017-12-18 2019-06-12 エーエーシー テクノロジーズ ピーティーイー リミテッド Imaging optical lens
US20200003992A1 (en) * 2018-06-29 2020-01-02 Genius Electronic Optical (Xiamen) Co., Ltd. Optical imaging lens
CN109298515A (en) * 2018-12-11 2019-02-01 浙江舜宇光学有限公司 Pick-up lens
CN111045197A (en) * 2019-12-31 2020-04-21 广东弘景光电科技股份有限公司 High-definition wide-angle day and night confocal optical system and camera module applying same
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CN112180563A (en) * 2020-11-03 2021-01-05 浙江舜宇光学有限公司 Optical imaging lens
CN113406777A (en) * 2021-07-21 2021-09-17 厦门力鼎光电股份有限公司 Wide-angle lens
CN216870923U (en) * 2021-10-23 2022-07-01 广东弘景光电科技股份有限公司 Small-size ultra-wide-angle day and night dual-purpose optical system and camera module applying same

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