CN112379511B - Small photographic objective with large aperture and large field of view - Google Patents

Small photographic objective with large aperture and large field of view Download PDF

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Publication number
CN112379511B
CN112379511B CN202110040218.XA CN202110040218A CN112379511B CN 112379511 B CN112379511 B CN 112379511B CN 202110040218 A CN202110040218 A CN 202110040218A CN 112379511 B CN112379511 B CN 112379511B
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lens
equal
group
refractive power
abbe number
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CN112379511A (en
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杨丹
陈召全
彭继
张伟
齐洋
卢业能
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AVIC Huadong Photoelectric Co Ltd
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AVIC Huadong Photoelectric 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
    • 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
    • G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
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  • Lenses (AREA)

Abstract

The invention provides a large-aperture large-field-of-view small photographic objective lens which comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and imaging equipment. The small photographic objective lens provided by the invention has the advantages of small size, light weight and high imaging quality, can be better suitable for various application scenes, and also has the characteristics of large aperture, large field angle and small distortion.

Description

Small photographic objective with large aperture and large field of view
Technical Field
The invention mainly relates to the technical field of optical imaging, in particular to a small photographic objective with a large aperture and a large field of view.
Background
In recent years, with the rapid update of various electronic products, various portable electronic products are becoming smaller, and the requirements of the market for the imaging lens at the product end are also gradually diversified. In the imaging instrument, the reasonability of the design of the optical lens directly determines the imaging quality of the imaging instrument. At the present stage, besides the imaging lens is required to have the characteristics of miniaturization and light weight so as to be better suitable for various application scenes, the imaging lens is also required to have the characteristics of large aperture, high image quality, small distortion, large field of view and the like so as to meet the imaging requirements of various fields.
In an optical imaging system (patent publication: CN 205826951U), it is mentioned that a compact optical imaging system is realized by using four aspheric lenses, and the system has strong light-receiving capability but has large distortion, which is not favorable for direct observation by human eyes. In one patent named optical system and camera including the same (patent publication: CN 106886085B), optical zooming is achieved using two sets of lenses, but the total length of the zoom system is large, and it is difficult to meet the use requirements of miniaturization and light weight.
Disclosure of Invention
Object of the Invention
The invention provides a small photographic objective with large aperture and large field of view, which has the advantages of miniaturization, light weight and high imaging quality.
Disclosure of Invention
In order to achieve the purpose, the invention adopts the technical scheme that: a large aperture large field of view miniature photographic objective comprising an optical imaging system comprising: a front group lens group composed of a plurality of lenses each having a positive refractive power and a lens having a negative refractive power; a rear group lens group including a plurality of lenses each having a positive refractive power and a lens having a negative refractive power; the imaging surface is positioned on one side of the rear group lens group; and the diaphragm is positioned between two lenses in two groups of lens groups.
Further, the front group lens group includes, in order from the object side to the imaging surface of the optical imaging system: a first lens having refractive power; a second lens having refractive power; a third perspective mirror; has optical power.
Further, the rear group lens group includes, in order from the object side to the imaging surface of the optical imaging system:
a fourth lens having refractive power; a fifth lens having refractive power; a sixth lens having refractive power; a seventh lens having an optical power and bonded to the sixth lens; an eighth lens having refractive power; and a ninth lens having refractive power.
Further, the first lens has a positive refractive power; the second lens has a positive diopter; the third lens has a negative diopter; the fourth lens has a positive refractive power; the fifth lens has a positive refractive power; the sixth lens has a positive refractive power; the seventh lens has a negative refractive power; the eighth lens has a positive refractive power; the ninth lens has a negative refractive power.
Furthermore, the refractive index Nd1 of the first lens is more than or equal to 1.7, and the Abbe number Vd1 of the first lens is more than or equal to 35; the refractive index Nd2 of the second lens is more than or equal to 1.8, and the Abbe number Vd2 of the second lens is more than or equal to 41; the refractive index Nd3 of the third lens is less than or equal to 1.85, and the Abbe number Vd3 of the third lens is more than or equal to 20; the refractive index Nd4 of the fourth lens is more than or equal to 1.8, and the Abbe number Vd4 of the fourth lens is less than or equal to 50; the refractive index Nd5 of the fifth lens is less than or equal to 1.8, and the Abbe number Vd5 of the fifth lens is more than or equal to 40; the refractive index Nd6 of the sixth lens is more than or equal to 1.5, and the Abbe number Vd6 of the sixth lens is less than or equal to 70; the refractive index Nd7 of the seventh lens is more than or equal to 1.7, and the Abbe number Vd7 of the seventh lens is less than or equal to 22; the refractive index Nd8 of the eighth lens is more than or equal to 1.8, and the Abbe number Vd8 of the eighth lens is more than or equal to 40; the refractive index Nd9 of the ninth lens is less than or equal to 1.6, and the Abbe number Vd9 of the ninth lens is more than or equal to 50; wherein the difference of the refractive indexes of the seventh lens and the sixth lens is Nd7-Nd6 ≦ 0.4; the Abbe number of the sixth lens and the Abbe number of the seventh lens are Vd6-Vd7 which are not less than 30.
Further, the focal length of the front group lens group is fFront sideThe focal length of the rear group lens is fRear end；
Focal length f of the front group lens groupFront sideFocal length f of the rear group lens groupRear endHas a ratio of fFront side/fRear end(ii) a The range of the ratio is-9 to fFront side/fRear end≤-6。
Further, the first lens is a meniscus lens with positive diopter; the second lens is a meniscus lens with positive diopter; the third lens is a biconcave lens with negative diopter; the fourth lens is a biconvex lens with positive diopter; the fifth lens is a meniscus lens with positive diopter, an incident surface of the fifth lens is a concave surface of the meniscus lens, and an emergent surface of the fifth lens is a convex surface of the meniscus lens; the sixth lens is a biconvex lens with positive diopter; the seventh lens is a meniscus lens with negative diopter, an incident surface of the seventh lens is a concave surface of the meniscus lens, and an emergent surface of the seventh lens is a convex surface of the meniscus lens; the emergent surface of the sixth lens is attached to the incident surface of the seventh lens; the eighth lens is a meniscus lens with positive diopter, an incident surface of the eighth lens is a convex surface of the meniscus lens, and an emergent surface of the eighth lens is a concave surface of the meniscus lens; the ninth lens is a biconcave lens with negative diopter.
Further, a diaphragm is disposed between the two lenses of the optical imaging system, for example, a diaphragm may be disposed between the third lens and the fourth lens, the diaphragm disposed in this position adjusts the amount of light incident to the image sensor, the diaphragm is disposed to divide the refractive power of the optical system into two, the total refractive power of the front group of lenses is negative, and the refractive power of the rear group of lenses is positive, which is advantageous to increase the field of view of the optical imaging system and reduce the total length of the optical imaging system.
Further, the imaging device is a CMOS image sensor or a CCD image sensor, an imaging surface is arranged in front of the CMOS image sensor or the CCD image sensor, and the imaging surface can use sealing protective glass.
Furthermore, the optical imaging system only allows light in the 600-1000nm waveband to pass through, so that the large-aperture large-field-of-view small-sized photographic objective works in the 600-1000nm waveband.
Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a large-aperture large-field-of-view small photographic objective which comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and imaging equipment, wherein light rays emitted from an object sequentially pass through the first lens, the second lens, the third lens, the diaphragm, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens to output light rays, the total glass mass of an optical imaging system is less than 20g, the total optical length is less than 35mm, the aperture is less than 20mm, the miniaturization, the light weight and the high imaging quality are considered, the small photographic objective can be better suitable for various application scenes, and simultaneously has the characteristics of large aperture, large field angle and small distortion.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic view of an optical imaging system of a compact photographic objective provided by the present invention;
FIG. 2 is a dot-sequence diagram of a compact photographic objective provided by the present invention;
FIG. 3 is a graph of the modulation transfer function of a compact photographic objective lens provided by the present invention;
FIG. 4 is a graph of field curvature and distortion of a compact photographic objective lens provided by the present invention;
FIG. 5 is a graph of relative illumination of a compact photographic objective lens provided by the present invention;
FIG. 6 is a diagram of axial chromatic aberration of a compact photographic objective provided by the present invention;
FIG. 7 is a vertical axis chromatic aberration diagram of a compact photographic objective lens provided by the present invention;
fig. 8 is a diagram showing the result of tolerance analysis of the small photographic objective lens according to the present invention.
Reference numerals
1-a first lens; 2-a second lens; 3-a third lens; 4-a fourth lens; 5-a fifth lens; 6-sixth lens; 7-a seventh lens; 8-an eighth lens; 9-ninth lens; 10-imaging plane.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The specification and examples are exemplary only.
Examples
A large aperture large field of view miniature photographic objective comprising an optical imaging system comprising: a front group lens group composed of a plurality of lenses each having a positive refractive power and a lens having a negative refractive power; a rear group lens group including a plurality of lenses each having a positive refractive power and a lens having a negative refractive power; the imaging surface is positioned on one side of the rear group lens group; and the diaphragm is positioned between two lenses in two groups of lens groups.
The front group lens group comprises the following components from the object side of the optical imaging system to the imaging surface in sequence: a first lens having refractive power; a second lens having refractive power; a third perspective mirror; has optical power.
The rear group lens group comprises from the object side of the optical imaging system to the imaging surface in sequence:
a fourth lens having refractive power; a fifth lens having refractive power; a sixth lens having refractive power; a seventh lens having an optical power and bonded to the sixth lens; an eighth lens having refractive power; and a ninth lens having refractive power.
The first lens has a positive diopter; the second lens has a positive diopter; the third lens has a negative diopter; the fourth lens has a positive refractive power; the fifth lens has a positive refractive power; the sixth lens has a positive refractive power; the seventh lens has a negative refractive power; the eighth lens has a positive refractive power; the ninth lens has a negative refractive power.
The refractive index Nd1 of the first lens is more than or equal to 1.7, and the Abbe number Vd1 of the first lens is more than or equal to 35; the refractive index Nd2 of the second lens is more than or equal to 1.8, and the Abbe number Vd2 of the second lens is more than or equal to 41; the refractive index Nd3 of the third lens is less than or equal to 1.85, and the Abbe number Vd3 of the third lens is more than or equal to 20; the refractive index Nd4 of the fourth lens is more than or equal to 1.8, and the Abbe number Vd4 of the fourth lens is less than or equal to 50; the refractive index Nd5 of the fifth lens is less than or equal to 1.8, and the Abbe number Vd5 of the fifth lens is more than or equal to 40; the refractive index Nd6 of the sixth lens is more than or equal to 1.5, and the Abbe number Vd6 of the sixth lens is less than or equal to 70; the refractive index Nd7 of the seventh lens is more than or equal to 1.7, and the Abbe number Vd7 of the seventh lens is less than or equal to 22; the refractive index Nd8 of the eighth lens is more than or equal to 1.8, and the Abbe number Vd8 of the eighth lens is more than or equal to 40; the refractive index Nd9 of the ninth lens is less than or equal to 1.6, and the Abbe number Vd9 of the ninth lens is more than or equal to 50; wherein the difference of the refractive indexes of the seventh lens and the sixth lens is Nd7-Nd6 ≦ 0.4; the Abbe number of the sixth lens and the Abbe number of the seventh lens are Vd6-Vd7 which are not less than 30.
The focal length of the front group lens group is fFront sideThe focal length of the rear group lens is fRear end；
Focal length f of the front group lens groupFront sideFocal length f of the rear group lens groupRear endHas a ratio of fFront side/fRear end(ii) a The range of the ratio is-9 to fFront side/fRear end≤-6。
The first lens is a meniscus lens with positive diopter; the second lens is a meniscus lens with positive diopter; the third lens is a biconcave lens with negative diopter; the fourth lens is a biconvex lens with positive diopter; the fifth lens is a meniscus lens with positive diopter, an incident surface of the fifth lens is a concave surface of the meniscus lens, and an emergent surface of the fifth lens is a convex surface of the meniscus lens; the sixth lens is a biconvex lens with positive diopter; the seventh lens is a meniscus lens with negative diopter, an incident surface of the seventh lens is a concave surface of the meniscus lens, and an emergent surface of the seventh lens is a convex surface of the meniscus lens; the emergent surface of the sixth lens is attached to the incident surface of the seventh lens; the eighth lens is a meniscus lens with positive diopter, an incident surface of the eighth lens is a convex surface of the meniscus lens, and an emergent surface of the eighth lens is a concave surface of the meniscus lens; the ninth lens is a biconcave lens with negative diopter.
The optical diaphragm is located between two lenses of the optical imaging system, for example, the optical diaphragm may be disposed between a third lens and a fourth lens, the optical diaphragm disposed in this position adjusts the amount of light incident to the image sensor, the optical diaphragm is disposed to divide the power of the optical system into two, the total power of the front group of lenses is negative, the power of the rear group of lenses is positive, this structure is advantageous to increase the field of view of the optical imaging system and reduce the total length of the optical imaging system, and the total power of some of the first to ninth lenses disposed between the object side of the optical imaging system and the optical diaphragm may be negative, and the total power of the other of the first to ninth lenses disposed between the optical diaphragm and the imaging surface of the optical imaging system may be positive.
The imaging device is a CMOS image sensor or a CCD image sensor, an imaging surface is arranged in front of the CMOS image sensor or the CCD image sensor, and the imaging surface can use sealing protective glass. The optical imaging system only allows light in the 600-1000nm waveband to pass through, so that the large-aperture large-field-of-view small-sized photographic objective works in the 600-1000nm waveband.
In this embodiment, the overall focal length of a large-aperture large-field-of-view small photographic objective lens is 21mm, the aperture value is 1.35, the field angle is 50 degrees, the length of the lens is 33.5mm, and the incident angle of the principal ray is less than or equal to 47 degrees.
The parameters of the glasses used for the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8 and the ninth lens 9 are shown in table 1, wherein the unit of table 1 is mm;
Figure DEST_PATH_IMAGE001
the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8 and the ninth lens 9 are made of high-performance glass materials, the production frequency is high, the large-aperture large-view-field small photographic objective lens can maintain excellent performance in high and low temperature (-30-50 ℃) environments, and the reliability is good.
As shown in fig. 2, the dot-sequence diagram of a large-aperture large-field-of-view small-sized photographic objective lens can be seen from fig. 2 that the scattered spots in each field of view are relatively concentrated and relatively uniform in distribution.
As shown in fig. 3, the modulation transfer function graph of a large-aperture large-field small-sized photographic objective lens corrects various aberrations to a good level, i.e., the comprehensive resolution level of the large-aperture large-field small-sized photographic objective lens is high, as can be seen from fig. 3.
The field curvature and distortion diagram of a large-aperture large-field-of-view small photographic objective lens is shown in FIG. 4. As can be seen from fig. 4, the optical distortion of the lens is positive distortion, i.e., pincushion distortion, and the absolute value of the pincushion distortion is less than or equal to 3%.
As shown in fig. 5, the graph of the relative illuminance of a large-aperture and large-field small-sized photographic objective lens shows that the curve trend is smooth, the relative illuminance value under the maximum field is greater than 0.55, the imaged picture is bright, and the brightness uniformity is good in fig. 5.
The axial chromatic aberration diagram of a large-aperture large-field small-sized photographic objective lens shown in fig. 6 and the vertical-axis chromatic aberration diagram of a large-aperture large-field small-sized photographic objective lens shown in fig. 7 can obtain that the chromatic aberration of the large-aperture large-field small-sized photographic objective lens is small.
As shown in fig. 8, the tolerance analysis result of the large-aperture large-field small photographic objective lens can indicate that the yield of the large-aperture large-field small photographic objective lens is high under the loose tolerance requirement, which is beneficial to assembly.
The small photographic objective lens with large aperture and large visual field designed according to the scheme has the advantages of large aperture, large visual field, small distortion, small size and light weight.
In summary, the small photographic objective with a large aperture and a large field of view provided by the present invention includes a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and an imaging device, wherein light emitted from an object sequentially passes through the first lens, the second lens, the third lens, the diaphragm, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, and the ninth lens to output light, a total glass mass of the optical imaging system is less than 20g, a total optical length is less than 35mm, an aperture is less than 20mm, and the small size, the light weight, and the high imaging quality are both considered, so that the small photographic objective can be better suitable for various application scenarios, and has characteristics of a large aperture, a large field angle, and a small distortion.
The foregoing is merely an illustrative embodiment of the present invention, and any equivalent changes and modifications made by those skilled in the art without departing from the spirit and principle of the present invention should fall within the protection scope of the present invention.

Claims (4)

1. A large aperture large field of view compact photographic objective comprising an optical imaging system, said optical imaging system comprising:
a front group lens group composed of a plurality of lenses each having a positive refractive power and a lens having a negative refractive power;
a rear group lens group including a plurality of lenses each having a positive refractive power and a lens having a negative refractive power;
the imaging surface is positioned on one side of the rear group lens group;
the diaphragm is positioned between two lenses in two groups of lens groups;
wherein the front group lens group comprises, in order from an object side to the imaging surface of the optical imaging system: a first lens, a second lens, and a third lens; the rear group lens group comprises from the object side of the optical imaging system to the imaging surface in sequence: the optical imaging system comprises a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens, wherein nine lenses are arranged on the optical imaging system;
the first lens has a positive diopter; the second lens has a positive diopter; the third lens has a negative diopter; the fourth lens has a positive refractive power; the fifth lens has a positive refractive power; the sixth lens has a positive refractive power; the seventh lens has a negative refractive power; the eighth lens has a positive refractive power; the ninth lens has a negative refractive power;
the focal length of the front group lens group is fFront sideThe focal length of the rear group lens is fRear end(ii) a Focal length f of the front group lens groupFront sideFocal length f of the rear group lens groupRear endHas a ratio of fFront side/fRear end(ii) a The range of the ratio is-9 to fFront side/fRear end≤-6。
2. A large aperture large field of view miniature photographic objective as claimed in claim 1, wherein said seventh lens is cemented to said sixth lens.
3. A large aperture large field of view miniature photographic objective as claimed in claim 1,
the refractive index Nd1 of the first lens is more than or equal to 1.7, and the Abbe number Vd1 of the first lens is more than or equal to 35;
the refractive index Nd2 of the second lens is more than or equal to 1.8, and the Abbe number Vd2 of the second lens is more than or equal to 41;
the refractive index Nd3 of the third lens is less than or equal to 1.85, and the Abbe number Vd3 of the third lens is more than or equal to 20;
the refractive index Nd4 of the fourth lens is more than or equal to 1.8, and the Abbe number Vd4 of the fourth lens is less than or equal to 50;
the refractive index Nd5 of the fifth lens is less than or equal to 1.8, and the Abbe number Vd5 of the fifth lens is more than or equal to 40;
the refractive index Nd6 of the sixth lens is more than or equal to 1.5, and the Abbe number Vd6 of the sixth lens is less than or equal to 70;
the refractive index Nd7 of the seventh lens is more than or equal to 1.7, and the Abbe number Vd7 of the seventh lens is less than or equal to 22;
the refractive index Nd8 of the eighth lens is more than or equal to 1.8, and the Abbe number Vd8 of the eighth lens is more than or equal to 40;
the refractive index Nd9 of the ninth lens is less than or equal to 1.6, and the Abbe number Vd9 of the ninth lens is more than or equal to 50;
wherein the difference of the refractive indexes of the seventh lens and the sixth lens is Nd7-Nd6 ≦ 0.4; the Abbe number of the sixth lens and the Abbe number of the seventh lens are Vd6-Vd7 which are not less than 30.
4. A large-aperture large-field small photographic objective lens as claimed in claim 1, characterized in that: the optical imaging system only allows light in the 600-1000nm wavelength band to pass through.
CN202110040218.XA 2020-10-30 2021-01-13 Small photographic objective with large aperture and large field of view Active CN112379511B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006072188A (en) * 2004-09-06 2006-03-16 Fujinon Corp Imaging lens
JP2009251399A (en) * 2008-04-09 2009-10-29 Nikon Corp Photographic lens, optical apparatus with the same, and image forming method
CN111538133A (en) * 2019-02-06 2020-08-14 康达智株式会社 Camera lens
CN111665611A (en) * 2019-03-08 2020-09-15 康达智株式会社 Camera lens

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006072188A (en) * 2004-09-06 2006-03-16 Fujinon Corp Imaging lens
JP2009251399A (en) * 2008-04-09 2009-10-29 Nikon Corp Photographic lens, optical apparatus with the same, and image forming method
CN111538133A (en) * 2019-02-06 2020-08-14 康达智株式会社 Camera lens
CN111665611A (en) * 2019-03-08 2020-09-15 康达智株式会社 Camera lens

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