CN113219631A - Long-focus optical lens - Google Patents

Long-focus optical lens Download PDF

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Publication number
CN113219631A
CN113219631A CN202110481447.5A CN202110481447A CN113219631A CN 113219631 A CN113219631 A CN 113219631A CN 202110481447 A CN202110481447 A CN 202110481447A CN 113219631 A CN113219631 A CN 113219631A
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lens
focal power
convex positive
double
concave negative
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CN113219631B (en
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孟涵
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Jiangxi Phoenix Optical Technology Co ltd
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Jiangxi Phoenix Optical 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
    • G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
    • 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
    • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/02—Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The invention discloses a long-focus optical lens, which comprises a first lens with double convex positive focal power, a second lens with double concave negative focal power, a third lens with double convex positive focal power, a fourth lens with double convex positive focal power, a fifth lens with double concave negative focal power, a sixth lens with double convex positive focal power, a seventh lens with double concave negative focal power, an eighth lens with double convex positive focal power and a ninth lens with double concave negative focal power, which are sequentially arranged from an object plane to an image plane, wherein each lens is a glass spherical lens, the first lens, the second lens and the third lens are glued into a first lens group, the fourth lens and the fifth lens are glued into a second lens group, the sixth lens and the seventh lens are glued into a third lens group, the eighth lens and the ninth lens are glued into a fourth lens group, and the integral focal length of the lens is larger than the total optical length. The lens can effectively correct aberration, improve imaging quality, has larger clear aperture and focal length compared with the lenses of the same type, and realizes high-quality telephoto imaging.

Description

Long-focus optical lens
Technical Field
The invention belongs to the technical field of optical lenses, and particularly relates to a long-focus optical lens.
Background
The telephoto lens is used for imaging a distant object and is characterized by a small relative aperture and a small field angle. The telescope is often used as an objective lens of a telescope and is matched with an eyepiece to observe a distant object. Telescopes are usually in the form of a visual system, so their concrete implementation is monocular or binoculars. Because the telephoto lens in the visual telescope is used in combination with an eyepiece, a prism, or a lens-type steering system, there is an aberration, thereby reducing the imaging quality. At present, a telephoto lens is also arranged on an intelligent electronic device end, such as a mobile phone, and is matched with an image sensor to directly record and display images, so that the process of observing by human eyes is omitted, but the space of the intelligent electronic device is limited, so that the aperture (such as 5mm) and the focal length (such as about 10 mm) of the telephoto lens are limited, and the imaging effect of a conventional telescopic objective lens is difficult to realize.
Disclosure of Invention
The invention aims to solve the defects, provides the telephoto optical lens, effectively corrects aberration through the cemented lens group, improves imaging quality, has larger clear aperture and focal length compared with the lenses of the same type, and effectively realizes high-quality telephoto imaging.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a telephoto optical lens, which comprises a first lens L1 with double convex positive focal power, a second lens L2 with double concave negative focal power, a third lens L3 with double convex positive focal power, a fourth lens L4 with double convex positive focal power, a fifth lens L5 with double concave negative focal power, a sixth lens L6 with double convex positive focal power, a seventh lens L7 with double concave negative focal power, an eighth lens L8 with double convex positive focal power and a ninth lens L9 with double concave negative focal power, wherein the lenses are glass spherical lenses, the first lens L1, the second lens L2 and the third lens L3 are glued to form a first lens group, the fourth lens L4 and the fifth lens L5 are glued to form a second lens group, the sixth lens L6 and the seventh lens L7 are glued to form a third lens group, and the eighth lens L8 and the ninth lens L9 are glued to form a fourth lens group;
the telephoto optical lens further satisfies:
Figure BDA0003049406230000021
wherein, EFL is the focal length of the optical lens, and TTL is the total optical length.
Preferably, the first lens L1 satisfies:
Nd≤1.60，Vd≥65
wherein Nd is a refractive index under d light, and Vd is an Abbe number under d light.
Preferably, the image side mirror curvature radius R92 of the ninth lens L9 satisfies:
0mm≤R92≤47mm。
preferably, each lens arranged in sequence from the object plane to the image plane has a corresponding focal length of 130.84 + -5%, -260.31 + -5%, 332.59 + -5%, 247.95 + -5%, -84.52 + -5%, 60.50 + -5%, -110.50 + -5%, 82.41 + -5%, -59.78 + -5%, a corresponding refractive index of 1.55 + -5%, 1.49 + -5%, 1.95 + -5%, 1.54 + -5%, 1.90 + -5%, 1.62 + -5%, 2.00 + -5%, 1.59 + -5%, 1.50 + -5%, a corresponding object-side mirror curvature radius of 122.21 + -5%, -179.57 + -5%, 540.21 + -5%, 215.73 + -5%, -320.95 + -5%, 105.99 + -5%, -158.44 + -5%, 80.32 + -5%, and a corresponding object-side mirror curvature radius of 3692 + -5%, and a corresponding object-side mirror curvature radius of-8 + -5%, 356 + -7375%, 3527%, -149.52 + -5%, 365%, 149.52%, -365%, respectively, -163.44 ± 5%, 324.15 ± 5%, -93.35 ± 5%, 46.52 ± 5%.
Preferably, the telephoto optical lens satisfies:
1.5≤|f89-f1234567|
wherein f is89Is the focal length of the fourth lens group, f1234567Is the total focal length of the first lens L1 to the seventh lens L7.
Preferably, the telephoto optical lens further includes a stop STO located between the seventh lens L7 and the eighth lens L8.
Compared with the prior art, the invention has the beneficial effects that: nine glass spherical lenses are glued into four lens groups, so that aberration is effectively corrected, and imaging quality is improved; the integral focal length of the lens is larger than the optical total length of the lens, and compared with the prior art, the lens has larger clear aperture and focal length, and effectively realizes high-quality telephoto imaging; and through rational distribution focal length and the curvature radius of controlling the ninth lens, the defocusing phenomenon caused by temperature difference is avoided, the chromatic dispersion is reduced, and the imaging quality is further improved.
Drawings
FIG. 1 is a schematic structural diagram of a telephoto optical lens according to the present invention;
FIG. 2 is a schematic diagram of an optical path of a telephoto optical lens according to the invention;
FIG. 3 is a MTF graph of a telephoto optical lens according to the present invention;
FIG. 4 is a distortion diagram of the telephoto optical lens according to the present invention;
FIG. 5 is a field curvature diagram of a telephoto optical lens according to the invention;
fig. 6 is an axial chromatic aberration diagram of the telephoto optical lens according to the invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is to be noted that, 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 application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
As shown in fig. 1-6, a telephoto optical lens includes a first lens L1 with double convex positive powers, a second lens L2 with double concave negative powers, a third lens L3 with double convex positive powers, a fourth lens L4 with double convex positive powers, a fifth lens L5 with double concave negative powers, a sixth lens L6 with double convex positive powers, a seventh lens L7 with double concave negative powers, an eighth lens L8 with double convex positive powers, and a ninth lens L9 with double concave negative powers, which are sequentially arranged along an object plane to an image plane, and each of the lenses is a glass spherical lens, the first lens L1, the second lens L2, and the third lens L3 are cemented into a first lens group, the fourth lens L4, the fifth lens L5 are cemented into a second lens group, the sixth lens L6, the seventh lens L7, and the eighth lens L8, the ninth lens L9 are cemented into a fourth lens group;
the telephoto optical lens further satisfies:
Figure BDA0003049406230000041
wherein, EFL is the focal length of the optical lens, and TTL is the total optical length.
As shown in fig. 2, the light passes through the first lens L1 to the ninth lens L9 in sequence, and nine lenses are cemented into four lens groups, so that the tolerance sensitivity of the lens can be reduced, the relative position deviation can be reduced, the aberration can be effectively corrected, and the imaging quality can be improved. The whole focal length of the lens is larger than the total optical length of the lens, and compared with the same type of lens, the lens has larger clear aperture and focal length, and high-quality telephoto imaging is effectively realized. And this embodiment adopts the full glass sphere structure of 9G to be equipped with protective glass between ninth lens L9 and image plane department sensitization chip, provide effective protection for sensitization chip.
In one embodiment, the first lens L1 satisfies:
Nd≤1.60，Vd≥65
wherein Nd is a refractive index under d light, and Vd is an Abbe number under d light.
In an embodiment, to reduce chromatic dispersion and further improve the imaging quality, the radius of curvature R92 of the image-side mirror surface of the ninth lens element L9 satisfies:
0mm≤R92≤47mm。
in an embodiment, each lens sequentially arranged from the object plane to the image plane has a corresponding focal length of 130.84 + -5%, -260.31 + -5%, 332.59 + -5%, 247.95 + -5%, -84.52 + -5%, 60.50 + -5%, -110.50 + -5%, 82.41 + -5%, -59.78 + -5%, a corresponding refractive index of 1.55 + -5%, 1.49 + -5%, 1.95 + -5%, 1.54 + -5%, 1.90 + -5%, 1.62 + -5%, 2.00 + -5%, 1.59 + -5%, 1.50 + -5%, a corresponding object-side mirror curvature radius of 122.21 + -5%, -179.57 + -5%, 540.21 + -5%, 215.73 + -5%, -320.95 + -5%, 105.99 + -5%, -158.44 + -5%, 80.32 + -5%, and a corresponding object-side mirror curvature radius of-3692 + -5%, and a corresponding object-side mirror curvature radius of-8 + -5%, 356 + -5%, 3527 + -27%, -365%, 149.52 + -5%, respectively, -163.44 ± 5%, 324.15 ± 5%, -93.35 ± 5%, 46.52 ± 5%.
Specifically, the values of the parameters of the lens in this embodiment are as shown in table 1 below.
TABLE 1
Figure BDA0003049406230000042
Figure BDA0003049406230000051
In Table 1, f1～f9Sequentially corresponding to focal lengths, n, of the first lens L1 through the ninth lens L91～n9Sequentially corresponding to refractive indexes, R, of the first lens L1 through the ninth lens L911、R21、R31、R41、R51、R61、R71、R81、R91Sequentially corresponding to the object side mirror curvature radii, R, of the first through ninth lenses L1-L912、R22、R32、R42、R52、R62、R72、R82、R92"negative" indicates a direction which corresponds to the radii of curvature of the image side mirror surfaces of the first lens L1 to the ninth lens L9 in this order, that is, a direction curved toward the object plane side. In fig. 1, R11, R21, R31, R41, R51, R61, R71, R81, and R91 sequentially correspond to object-side mirrors of the first lens L1 to the ninth lens L9, and R12, R22, R32, R42, R52, R62, R72, R82, and R92 sequentially correspond to image-side mirrors of the first lens L1 to the ninth lens L9.
In one embodiment, in order to reasonably distribute the focal power, the lens is not out of focus at different environmental temperatures, the working performance is more stable, and the telephoto optical lens satisfies the following conditions:
1.5≤|f89-f1234567|
wherein f is89Is the focal length of the fourth lens group, f1234567Is the total focal length of the first lens L1 to the seventh lens L7.
In an embodiment, the telephoto optical lens further includes a stop STO located between the seventh lens L7 and the eighth lens L8. To adjust the luminous flux to suit different imaging requirements.
The lens of the embodiment satisfies the following main parameters: the focal length f of the lens is 350mm, the aperture EPD of the entrance pupil is 70mm, the total optical length TTL is 292.7mm, the field angle FOV is 0.75 ° and the image height is 4.65 mm. From the above data, as shown in fig. 3, the lens MTF curve is close to the diffraction limit and relatively concentrated; as shown in fig. 4 and 5, the distortion is less than 0.05%, and the field curvature is within ± 0.02%; as shown in fig. 6, the axial chromatic aberration is within ± 0.06%. Therefore, the lens can effectively correct aberration, improve imaging quality and simultaneously realize a telephoto imaging effect.
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 the more specific and detailed embodiments described in the present application, but not should be understood as the limitation of the invention claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (6)

1. A telephoto optical lens, characterized in that: the telephoto optical lens comprises a first lens L1 with double convex positive focal power, a second lens L2 with double concave negative focal power, a third lens L3 with double convex positive focal power, a fourth lens L4 with double convex positive focal power, a fifth lens L5 with double concave negative focal power, a sixth lens L6 with double convex positive focal power, a seventh lens L7 with double concave negative focal power, an eighth lens L8 with double convex positive focal power and a ninth lens L9 with double concave negative focal power, wherein the lenses are glass spherical lenses, the first lens L1, the second lens L2 and the third lens L3 are cemented into a first lens group, the fourth lens L4 and the fifth lens L5 are cemented into a second lens group, the sixth lens L6 and the seventh lens L7 are cemented into a third lens group, and the eighth lens L8 and the ninth lens L9 are cemented into a fourth lens group;
the telephoto optical lens further satisfies:
Figure FDA0003049406220000011
wherein, EFL is the focal length of the optical lens, and TTL is the total optical length.
2. The tele optical lens of claim 1, wherein: the first lens L1 satisfies:
Nd≤1.60，Vd≥65
wherein Nd is a refractive index under d light, and Vd is an Abbe number under d light.
3. The tele optical lens of claim 1, wherein: the image side mirror surface radius of curvature R92 of the ninth lens L9 satisfies:
0mm≤R92≤47mm。
4. a telephoto optical lens according to claim 2 or 3, characterized in that: each lens arranged in sequence from the object surface to the image surface has a corresponding focal length of 130.84 + -5%, -260.31 + -5%, 332.59 + -5%, 247.95 + -5%, -84.52 + -5%, 60.50 + -5%, -110.50 + -5%, 82.41 + -5%, -59.78 + -5%, a corresponding refractive index of 1.55 + -5%, 1.49 + -5%, 1.95 + -5%, 1.54 + -5%, 1.90 + -5%, 1.62 + -5%, 2.00 + -5%, 1.59 + -5%, 1.50 + -5%, a corresponding curvature radius of an object side of 122.21 + -5%, -179.57 + -5%, 540.21 + -5%, 215.73 + -5%, -320.95 + -5%, 105.99 + -5%, -158.44 + -5%, 80.32 + -5%, -93.35 + -5%, and a corresponding curvature radius of an object side of-163.57 + -5%, 422.21 + -5%, -1007.67 + -5%, 4642 + -5%, 465%, and a corresponding curvature radius of an object side of-163.57 + -5%, 465%, respectively, 324.15 +/-5%, 93.35 +/-5% and 46.52 +/-5%.
5. The tele optical lens of claim 1, wherein: the telephoto optical lens satisfies:
1.5≤|f89-f1234567|
wherein f is89Is the focal length of the fourth lens group, f1234567Is the total focal length of the first through seventh lenses L1 through L7.
6. The tele optical lens of claim 1, wherein: the telephoto optical lens further includes a stop STO located between the seventh lens L7 and the eighth lens L8.
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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN115145009A (en) * 2022-09-02 2022-10-04 浙江大华技术股份有限公司 Lens and camera device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115145009A (en) * 2022-09-02 2022-10-04 浙江大华技术股份有限公司 Lens and camera device
CN115145009B (en) * 2022-09-02 2022-11-22 浙江大华技术股份有限公司 Lens and camera device

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