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CN113534425A - Zoom lens - Google Patents

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Publication number
CN113534425A
CN113534425A CN202110871767.1A CN202110871767A CN113534425A CN 113534425 A CN113534425 A CN 113534425A CN 202110871767 A CN202110871767 A CN 202110871767A CN 113534425 A CN113534425 A CN 113534425A
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CN
China
Prior art keywords
lens
group
convex
optical power
zoom
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110871767.1A
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Chinese (zh)
Inventor
蓝岚
沈悦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sunny Optics Zhongshan Co Ltd
Original Assignee
Sunny Optics Zhongshan Co Ltd
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Publication date
Application filed by Sunny Optics Zhongshan Co Ltd filed Critical Sunny Optics Zhongshan Co Ltd
Priority to CN202110871767.1A priority Critical patent/CN113534425A/en
Publication of CN113534425A publication Critical patent/CN113534425A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
    • G02B15/1445—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being negative
    • G02B15/144515—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being negative arranged -+++
    • 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
    • G02B13/001—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
    • 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
    • G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/177—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses

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

Abstract

The invention relates to a zoom lens, which comprises a compensation group (G1) with negative optical power, a first fixed group (G2) with positive optical power and a variable power group (G3) with positive optical power, which are sequentially arranged from the object side to the image side along the optical axis, and further comprises a second fixed group (G4) positioned on the image side of the variable power group (G3), wherein in the process of power change, the first fixed group (G2) and the second fixed group (G4) are fixed relative to the position of an image surface, and the compensation group (G1) and the variable power group (G3) can move along the optical axis. The zoom lens has the characteristics of super large aperture, large target surface and low cost.

Description

Zoom lens
Technical Field
The invention relates to the technical field of optical imaging, in particular to a zoom lens.
Background
The zoom lens has the characteristic of variable focal length, can meet the requirements of various monitoring scenes, and therefore has attracted wide attention in the security monitoring market. The rapid popularization and development of security monitoring also have higher requirements on the image acquisition function of the lens. The zoom lens with a powerful image acquisition function needs to ensure that large aperture zooming is realized within a full focal length range under the condition of meeting the requirement of a high-resolution large target surface. Thus, even under the condition that the external supplementary lighting is insufficient, high-definition image quality can still be shot. In order to expand the use scenes of the lens, the zoom lens also needs to have the performance of not generating virtual focus in the state of low temperature of-40 ℃ to high temperature of 80 ℃. The lens with the above characteristics has a wide application prospect, and therefore, the manufacturing cost needs to be considered. However, the zoom lens in the related art generally fails to satisfy the above requirements.
Disclosure of Invention
The invention aims to provide a zoom lens.
In order to achieve the above object, the present invention provides a zoom lens, including a compensation group having a negative optical power, a first fixed group having a positive optical power, and a variable power group having a positive optical power, which are arranged in order from an object side to an image side along an optical axis, and further including a second fixed group located on the image side of the variable power group, wherein during a zooming process, positions of the first fixed group and the second fixed group relative to an image plane are fixed, and the compensation group and the variable power group are movable along the optical axis.
According to one aspect of the invention, the optical power of the second fixed set is positive.
According to one aspect of the present invention, the compensation group includes a first lens having negative optical power, a second lens having negative optical power, and a third lens having positive optical power, which are arranged in order from the object side to the image side.
According to one aspect of the invention, the first lens is a convex-concave or concave-concave type lens, the second lens is a paraxial region convex-concave type lens, and the third lens is a paraxial region convex-concave type lens.
According to one aspect of the invention, the first fixed group includes a fourth lens having positive optical power.
According to one aspect of the invention, the fourth lens is a paraxial convex-concave lens.
According to one aspect of the present invention, the variable power group includes, in order from the object side to the image side, a fifth lens having positive optical power, a sixth lens having negative optical power, a seventh lens having positive optical power, an eighth lens having negative optical power, a ninth lens having positive optical power, and a tenth lens having positive optical power;
and the sixth lens and the seventh lens are glued to form a glued lens group.
According to an aspect of the invention, the fifth lens is a convex-convex type lens, the sixth lens is a convex-concave type lens, the seventh lens is a convex-concave or convex-convex type lens, the eighth lens is a paraxial region convex-concave type lens, the ninth lens is a paraxial region convex-convex or concave-convex type lens, and the tenth lens is a paraxial region convex-concave type lens.
According to an aspect of the invention, the second fixed group includes an eleventh lens having a positive optical power.
According to an aspect of the invention, the eleventh lens is a paraxial convex or concave-convex lens.
According to an aspect of the present invention, the zoom lens further includes a fixed position stop located between the compensation group and the first fixed group or between the first fixed group and the magnification-varying group.
According to an aspect of the present invention, a diameter SD _ STO of the stop and a distance TTL _ W from a front surface vertex of the first lens to an image plane of the zoom lens at a wide-angle end satisfy the following relationship: 0.08< SD _ STO/TTL _ W < 0.20.
According to an aspect of the present invention, a focal length F4 of the fourth lens and a focal length Fw of the zoom lens at the wide end satisfy the following relationship: 10.00< | F4/Fw | < 35.00.
According to an aspect of the present invention, a focal length F11 of the eleventh lens and a focal length Fw of the zoom lens at the wide end satisfy the following relationship: 12.00< | F11/Fw |.
According to one aspect of the invention, the focal length fi of the compensation group and the focal length fiii of the variable magnification group satisfy the following relationship: the absolute value of F I/F III is more than or equal to 0.70 and less than or equal to 0.90.
According to an aspect of the present invention, a distance Δ D by which the compensation group is moved from the wide angle end to the telephoto end of the zoom lens and a distance TTL _ W of the zoom lens from the front surface vertex of the first lens to the image plane at the wide angle end satisfy the following relationship: 0.11< Δ D/TTL _ W < 0.18.
According to an aspect of the present invention, a focal length F5 of the fifth lens and a focal length fiii of the variable power group satisfy the following relationship: 0.95< F5/FIII < 1.30.
According to an aspect of the present invention, the focal length FB of the cemented lens group in the variable power group and the focal length fiii of the variable power group satisfy the following relationship: 2.50< | FB/FIII | < 18.00.
According to an aspect of the invention, an abbe number vd6 of the sixth lens and an abbe number vd7 of the seventh lens satisfy the following relationship: 22< | vd7-vd6| < 66.
According to an aspect of the present invention, the fifth lens is an aspherical glass lens, and a refractive index nd5 and an abbe number vd5 thereof respectively satisfy the following conditions: 1.55< nd5< 1.85; 40 is less than or equal to vd5 is less than or equal to 70.
According to an aspect of the present invention, the second lens, the eighth lens, the ninth lens and the eleventh lens are plastic aspherical lenses, and the third lens, the fourth lens and the tenth lens are spherical or aspherical lenses.
According to an aspect of the present invention, the focal length F8 of the eighth lens, the focal length F9 of the ninth lens, the focal length F10 of the tenth lens, and the focal length fiii of the magnification-varying group satisfy the following relationships, respectively: 2.00< | F8/FIII < 5.00; 1.00< F9/FIII < 3.00; 1.50< F10/FIII.
According to the concept of the invention, the zoom lens with the ultra-large aperture, the large target surface and the low cost is provided.
According to one scheme of the invention, the eleventh lens independently forms another fixed group, so that the imaging quality of the large-target-surface lens is improved, and the aberration is corrected.
According to one scheme of the invention, the relationship between the diameter of the diaphragm and the distance from the top point of the front surface of the first lens to the image plane of the zoom lens at the wide-angle end is reasonably set, so that the fixed larger aperture of the diaphragm ensures the larger diameter of the entrance pupil within the full focal range, and the large-aperture zooming is favorably realized.
According to one scheme of the invention, the relationship between the focal length of the fourth lens and the focal length of the zoom lens at the wide-angle end is reasonably set, so that the height of light rays is reduced after the light rays pass through the fixed lens group, and the large-aperture zooming is realized.
According to one scheme of the invention, the relationship between the focal length of the eleventh lens and the focal length of the zoom lens at the wide-angle end is reasonably set, so that the correction of aberration is emphasized, and higher imaging quality under a large target surface is ensured.
According to one scheme of the invention, the relationship between the focal length of the compensation group and the focal length of the zoom group is reasonably set, so that light can be better transmitted, better focusing in the zooming process is facilitated, and the imaging quality is ensured.
According to one scheme of the invention, by reasonably setting the relationship between the distance of the compensation group moving from the wide-angle end to the telephoto end of the zoom lens and the distance of the zoom lens from the top point of the front surface of the first lens to the image plane at the wide-angle end, a large zoom ratio can be realized by small group interval variation in the process of zooming from the wide-angle end to the telephoto end, and the super-large aperture can be realized and the total length of the lens can be compressed.
According to one scheme of the invention, the relationship between the focal length of the fifth lens and the focal length of the zoom group is reasonably set, so that the light transmissibility among the groups is favorably improved, and the zoom ratio can be realized as large as possible under the condition of a certain total length, thereby being favorable for realizing a large aperture at the far end and better ensuring the imaging quality of a full focus section.
According to one scheme of the invention, the relationship between the focal length of the cemented lens group in the zoom group and the focal length of the zoom group is reasonably set, so that the light transmissibility can be further improved, the light can be further converged, and high-definition imaging under a large aperture is facilitated.
According to one scheme of the invention, the spherical aberration and chromatic aberration of the system can be corrected by reasonably setting the relationship between the Abbe number of the sixth lens and the Abbe number of the seventh lens, so that the imaging sharpness of the lens is ensured.
According to one aspect of the present invention, the fifth lens is configured as an aspherical glass lens, which is advantageous for correcting higher order aberrations. Moreover, the refractive index and the Abbe number of the zoom lens are reasonably set, so that chromatic aberration can be corrected, and the full-focus large-aperture zoom can be realized.
According to one scheme of the invention, various aberrations of the system can be well corrected by reasonably configuring the aspheric surface and the spherical lens so as to improve the resolution of the lens and realize high definition resolving power. In addition, by skillfully matching the glass and the plastic lens, the back focal drift of the lens at high and low temperatures can be perfectly compensated, and the clear imaging of the lens at the extreme temperature condition is ensured.
According to one scheme of the invention, the relationship between the focal length of the eighth lens, the focal length of the ninth lens, the focal length of the tenth lens and the focal length of the zoom lens group is reasonably set, so that the aberration correction is facilitated, and the zoom lens can be effectively ensured not to be in virtual focus in a high-temperature and low-temperature state.
Drawings
Fig. 1 schematically shows a configuration diagram of a zoom lens according to a first embodiment of the present invention at a wide-angle end;
fig. 2 is a schematic structural view showing a telephoto end of a zoom lens according to a first embodiment of the present invention;
fig. 3 is a view schematically showing visible RAY FAN at the wide-angle end of a zoom lens according to a first embodiment of the present invention;
FIG. 4 is a schematic view showing a visible RAY RAY FAN at the telephoto end of the zoom lens according to the first embodiment of the present invention;
fig. 5 schematically shows a configuration diagram of a zoom lens according to a second embodiment of the present invention at a wide-angle end;
FIG. 6 is a schematic view showing a configuration of a telephoto end of a zoom lens according to a second embodiment of the present invention;
fig. 7 is a view schematically showing visible RAY FAN at the wide-angle end of a zoom lens according to a second embodiment of the present invention;
FIG. 8 is a schematic view showing a visible RAY RAY FAN at the telephoto end of a zoom lens according to a second embodiment of the present invention;
fig. 9 schematically shows a configuration diagram of a zoom lens according to a third embodiment of the present invention at a wide-angle end;
FIG. 10 is a schematic view showing a configuration of a telephoto end of a zoom lens according to a third embodiment of the present invention;
fig. 11 schematically shows a visible RAY FAN diagram at the wide-angle end of a zoom lens according to a third embodiment of the present invention;
FIG. 12 is a view schematically showing a visible RAY RAY FAN at the telephoto end of a zoom lens according to a third embodiment of the present invention;
fig. 13 schematically shows a configuration diagram at the wide-angle end of a zoom lens according to a fourth embodiment of the present invention;
fig. 14 is a schematic view showing a configuration of a telephoto end of a zoom lens according to a fourth embodiment of the present invention;
fig. 15 is a view schematically showing visible RAY FAN at the wide-angle end of a zoom lens according to a fourth embodiment of the present invention;
fig. 16 is a schematic view of a visible RAY FAN at the telephoto end of a zoom lens according to a fourth embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
In describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship that is based on the orientation or positional relationship shown in the associated drawings, which is for convenience and simplicity of description only, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above-described terms should not be construed as limiting the present invention.
The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.
Referring to fig. 1, the zoom lens of the present invention includes, in order from an object side to an image side along an optical axis, a compensation group G1 having negative optical power, a first fixed group G2 having positive optical power, a variable power group G3 having positive optical power, and a second fixed group G4 having positive optical power. In the variable magnification process, the first fixed group G2 and the second fixed group G4 are fixed in position relative to the image plane, and the compensation group G1 and the variable magnification group G3 are movable along the optical axis. Therefore, the zoom lens has the performances of ultra-large aperture, large target surface and low cost.
In the present invention, the compensation group G1 includes, in order from the object side to the image side, a first lens L1 having negative optical power, a second lens L2 having negative optical power, and a third lens L3 having positive optical power. The first lens L1 is a convex-concave or concave-concave lens, the second lens L2 is a paraxial convex-concave lens, and the third lens L3 is a paraxial convex-concave lens. The first fixed group G2 includes a fourth lens L4 having positive optical power, and the fourth lens L4 is a paraxial convex-concave type lens. The variable power group G3 includes a fifth lens L5 having positive optical power, a sixth lens L6 having negative optical power, a seventh lens L7 having positive optical power, an eighth lens L8 having negative optical power, a ninth lens L9 having positive optical power, and a tenth lens L10 having positive optical power, which are arranged in order from the object side to the image side. The sixth lens element L6 and the seventh lens element L7 are cemented together to form a cemented lens group. The fifth lens L5 is a convex-convex lens, the sixth lens L6 is a convex-concave lens, the seventh lens L7 is a convex-concave or convex-convex lens, the eighth lens L8 is a paraxial region convex-concave lens, the ninth lens L9 is a paraxial region convex-convex or concave-convex lens, and the tenth lens L10 is a paraxial region convex-concave lens. The second fixed group G4 includes an eleventh lens L11 having positive optical power, and the eleventh lens L11 is a paraxial convex or concave lens. In addition, the zoom lens of the present invention further includes a fixed stop STO between the compensation group G1 and the first fixed group G2 or between the first fixed group G2 and the variable magnification group G3.
In the present invention, the diameter SD _ STO of the stop STO and the distance TTL _ W from the front surface vertex of the first lens L1 to the image plane of the zoom lens at the wide-angle end satisfy the following relationship: 0.08< SD _ STO/TTL _ W < 0.20. Thus, the fixed aperture of the large stop STO ensures a large entrance pupil diameter in the full focus range, which is beneficial to realizing the zoom of the large aperture.
In the present invention, the focal length F4 of the fourth lens L4 and the focal length Fw of the zoom lens at the wide-angle end satisfy the following relationship: 10.00< | F4/Fw | < 35.00. The distribution mode of the focal power among the groups is beneficial to reducing the height of light rays after the light rays pass through the fixed lens group, and realizing large-aperture zooming.
In the present invention, the focal length F11 of the eleventh lens L11 and the focal length Fw of the zoom lens at the wide-angle end satisfy the following relationship: 12.00< | F11/Fw |. The distribution mode of the focal power among the groups emphasizes on correcting aberration and ensures higher imaging quality under a large target surface.
In the present invention, the focal length fi of the compensation group G1 and the focal length fi of the variable magnification group G3 satisfy the following relationship: the absolute value of F I/F III is more than or equal to 0.70 and less than or equal to 0.90. The distribution mode of the focal power among the groups can better transmit light, is beneficial to better focusing in the zooming process and ensures the imaging quality.
In the present invention, a distance Δ D of the compensation group G1 moving from the wide angle end to the telephoto end of the zoom lens and a distance TTL _ W of the zoom lens from the front surface vertex of the first lens L1 to the image plane at the wide angle end satisfy the following relationship: 0.11< Δ D/TTL _ W < 0.18. Therefore, a large zoom ratio can be realized by a small group interval variation in the process of zooming from a wide-angle end to a telephoto end, and the super-large aperture can be realized while the total length of the lens is compressed.
In the present invention, the focal length F5 of the fifth lens L5 and the focal length fiii of the variable magnification group G3 satisfy the following relationship: 0.95< F5/FIII < 1.30. The distribution relation of the focal power is beneficial to improving the transmissibility of light among groups, can realize a large zoom ratio as far as possible under a certain total length condition, is beneficial to realizing a large aperture at a far-end and better ensures the imaging quality of a full focus section.
In the present invention, the focal length FB of the cemented lens group in the variable magnification group G3 and the focal length fiii of the variable magnification group G3 satisfy the following relationship: 2.50< | FB/FIII | < 18.00. Therefore, the distribution mode of the focal power further improves the transmissibility of the light rays, so that the light rays are further converged, and high-definition imaging under a large aperture is facilitated.
In the present invention, abbe number vd6 of the sixth lens L6 and abbe number vd7 of the seventh lens L7 satisfy the following relationship: 22< | vd7-vd6| < 66. Therefore, by reasonably configuring the Abbe number collocation of the cemented lens, the spherical aberration and chromatic aberration of the system are corrected, and the imaging sharpness of the lens is ensured.
In the present invention, the fifth lens L5 is an aspherical glass lens, and its refractive index nd5 and abbe number vd5 satisfy the following conditions, respectively: 1.55< nd5< 1.85; 40 is less than or equal to vd5 is less than or equal to 70. It can be seen that the fifth lens element L5 of the present invention is an aspheric glass lens, which is advantageous for correcting higher order aberrations. And the range of nd and vd is limited, so that chromatic aberration can be corrected, and the full-focus large-aperture zooming can be realized.
In the present invention, the second lens L2, the eighth lens L8, the ninth lens L9, and the eleventh lens L11 are plastic aspherical lenses, and the third lens L3, the fourth lens L4, and the tenth lens L10 are spherical or aspherical lenses. Therefore, various aberrations of the system are well corrected by reasonably configuring the aspheric surface and the spherical lens, so that the resolution of the lens is improved, and high-definition resolving power is realized. In addition, by skillfully matching the glass and the plastic lens, the back focal drift of the lens at high and low temperatures is perfectly compensated, and the clear imaging of the lens at the extreme temperature condition is ensured.
In the present invention, the focal length F8 of the eighth lens L8, the focal length F9 of the ninth lens L9, the focal length F10 of the tenth lens L10, and the focal length fiii of the variable magnification group G3 satisfy the following conditions, respectively: 2.00< | F8/FIII < 5.00; 1.00< F9/FIII < 3.00; 1.50< F10/FIII. The positive and negative focal power matching relationship is beneficial to aberration correction, and the zoom lens is effectively ensured not to be virtual focus in a high-temperature and low-temperature state.
In summary, the zoom lens of the present invention can ensure an ultra-large aperture in the entire zoom range from the wide-angle end to the telephoto end with a short stroke through reasonable power matching. Therefore, high-definition image acquisition can be realized even under weak illumination conditions. In addition, the invention adopts a mode of reasonably matching the glass lens and the plastic lens, and still ensures various performances of the system under the condition of using less glass lenses, and greatly reduces the production cost. And then through the specific material selection of the lens and the reasonable focal power matching, the system can still ensure good resolution at the high temperature of 80 ℃ and the low temperature of-40 ℃, and the system does not have virtual focus at the high temperature and the low temperature.
In the following four embodiments, the surfaces of each lens and stop STO are denoted by 1, 2, …, and N, the cemented surface of the cemented lens group is denoted by one surface, and the image surface is denoted by IMA. The aspherical lens surface type satisfies the following formula:
Z＝cy2/{1+[1-(1+k)c2y2]1/2}+a4y4+a6y6+a8y8+a10y10+a12y12+a14y14+a16y16；
z is the axial distance from the curved surface to the top point at the position which is along the direction of the optical axis and is vertical to the optical axis by the height h; c represents the curvature at the apex of the aspherical surface; y is the radial coordinate of the aspheric lens; k is a conic coefficient; a is4、a6、a8、a10、a12、a14、a16Respectively representing aspheric coefficients of fourth order, sixth order, eighth order, tenth order, twelfth order, fourteen order and sixteenth order.
The parameters of each embodiment specifically satisfying the above conditional expressions are shown in table 1 below:
Figure BDA0003189425960000111
TABLE 1
First embodiment
Referring to fig. 1 and 2, in the present embodiment, the stop STO is located on the object side of the fourth lens L4, the third lens L3 and the tenth lens L10 are plastic aspheric lenses, and the fourth lens L4 is a glass spherical lens. Focal length: 4.7-9.6 mm; f number is 1.0-1.5; TTL _ W: 54.73 mm.
The parameters related to each lens in this embodiment include surface type, curvature radius, thickness, and refractive index, as shown in table 2 below:
surface number Surface type Radius of curvature Thickness of Refractive index Abbe number
1 Spherical surface 750.00 0.70 1.71 53.8
2 Spherical surface 9.88 5.04
3 Aspherical surface 34.57 1.61 1.54 55.7
4 Aspherical surface 8.31 0.68
5 Aspherical surface 22.76 2.51 1.66 19.5
6 Aspherical surface 758.92 D1
7(STO) Spherical surface Infinity 0.30
8 Spherical surface 92.00 1.26 1.94 18.0
9 Spherical surface 232.47 D2
10 Aspherical surface 15.23 6.08 1.82 40.0
11 Aspherical surface -27.46 1.07
12 Spherical surface 138.87 0.60 1.67 26.1
13 Spherical surface 7.51 5.51 1.46 90.2
14 Spherical surface -41.19 0.10
15 Aspherical surface 21.72 2.13 1.64 21.5
16 Aspherical surface 12.70 0.69
17 Aspherical surface -30.59 1.85 1.54 56.0
18 Aspherical surface -9.85 0.10
19 Aspherical surface 7.06 1.91 1.64 23.5
20 Aspherical surface 6.52 D3
21 Aspherical surface 47.62 1.41 1.53 30.0
22 Aspherical surface -300.00 2.90
23 Spherical surface Infinity 0.70 1.52 64.2
24 Spherical surface Infinity 0.57
IMA Spherical surface Infinity
TABLE 2
The K value and the aspherical surface coefficient in this embodiment are shown in table 3 below:
Figure BDA0003189425960000121
Figure BDA0003189425960000131
TABLE 3
The variable interval values when changing from the wide angle end to the telephoto end are shown in table 4 below:
surface number Thickness of Wide angle end Telescope end
6 D1 10.16 2.18
9 D2 5.62 0.10
20 D3 1.23 6.75
TABLE 4
With reference to fig. 3 and 4, the zoom lens according to the present embodiment can ensure an ultra-large aperture over the entire zoom range from the wide-angle end to the telephoto end with a short stroke. The production cost is greatly reduced while various performances of the system are ensured. And can still ensure good resolution ratio at the high temperature of 80 ℃ and the low temperature of minus 40 ℃, and can not generate virtual coke at the high temperature and the low temperature.
Second embodiment
Referring to fig. 5 and 6, in the present embodiment, the stop STO is located on the object side of the fourth lens L4, the third lens L3 and the fourth lens L4 are plastic aspheric lenses, and the tenth lens L10 is a glass spherical lens. Focal length: 4.8-9.05 mm; f number is 1.0-1.4; TTL _ W: 50.50 mm.
The parameters related to each lens in this embodiment, including surface type, radius of curvature, thickness, and refractive index, are shown in table 5 below:
surface number Surface type Radius of curvature Thickness of Refractive index Abbe number
1 Spherical surface 171.21 0.75 1.80 46.6
2 Spherical surface 9.37 4.31
3 Aspherical surface 36.63 1.61 1.54 55.7
4 Aspherical surface 7.75 0.42
5 Aspherical surface 18.22 2.39 1.66 20.4
6 Aspherical surface 918.09 D1
7(STO) Spherical surface Infinity 0.30
8 Aspherical surface 41.77 1.56 1.64 23.5
9 Aspherical surface 94.58 D2
10 Aspherical surface 12.07 5.58 1.60 70.0
11 Aspherical surface -23.76 1.13
12 Spherical surface 49.72 0.60 1.64 43.7
13 Spherical surface 7.05 4.45 1.61 68.4
14 Spherical surface 23.69 0.10
15 Aspherical surface 9.57 1.98 1.65 23.5
16 Aspherical surface 6.57 1.07
17 Aspherical surface 23.47 1.73 1.54 56.0
18 Aspherical surface -38.20 0.10
19 Spherical surface 9.80 3.10 1.74 56.3
20 Spherical surface 17.47 D3
21 Aspherical surface 47.72 1.43 1.54 55.7
22 Aspherical surface 55.43 2.82
23 Spherical surface Infinity 0.70 1.52 64.2
24 Spherical surface Infinity 0.48
IMA Spherical surface Infinity
TABLE 5
The K value and the aspherical surface coefficient in this embodiment are shown in table 6 below:
Figure BDA0003189425960000151
TABLE 6
The variable interval values when changing from the wide angle end to the telephoto end are shown in table 7 below:
surface number Thickness of Wide angle end Telescope end
6 D1 7.92 1.65
9 D2 5.01 0.10
20 D3 0.96 5.87
TABLE 7
With reference to fig. 7 and 8, the zoom lens according to the present embodiment can secure an ultra-large aperture over the entire zoom range from the wide-angle end to the telephoto end with a short stroke. The production cost is greatly reduced while various performances of the system are ensured. And can still ensure good resolution ratio at the high temperature of 80 ℃ and the low temperature of minus 40 ℃, and can not generate virtual coke at the high temperature and the low temperature.
Third embodiment
Referring to fig. 9 and 10, in the present embodiment, the stop STO is located on the object side of the fourth lens L4, the fourth lens L4 and the tenth lens L10 are plastic aspheric lenses, and the third lens L3 is a glass spherical lens. Focal length: 4.6-9.35 mm; f number is 1.0-1.48; TTL _ W: 52.87 mm.
The parameters of each lens in this embodiment, including surface type, radius of curvature, thickness, and refractive index, are as shown in table 8 below:
Figure BDA0003189425960000161
Figure BDA0003189425960000171
TABLE 8
The K value and the aspherical surface coefficient in this embodiment are shown in table 9 below:
Figure BDA0003189425960000172
TABLE 9
The variable interval values when changing from the wide angle end to the telephoto end are shown in table 10 below:
surface number Thickness of Wide angle end Telescope end
6 D1 10.33 1.63
9 D2 5.35 0.10
20 D3 1.23 6.48
Watch 10
With reference to fig. 11 and 12, the zoom lens according to the present embodiment can secure an ultra-large aperture throughout the entire zoom range from the wide-angle end to the telephoto end with a short stroke. The production cost is greatly reduced while various performances of the system are ensured. And can still ensure good resolution ratio at the high temperature of 80 ℃ and the low temperature of minus 40 ℃, and can not generate virtual coke at the high temperature and the low temperature.
Fourth embodiment
Referring to fig. 13 and 14, in the present embodiment, the stop STO is located on the image side of the fourth lens element L4, the third lens element L3 and the tenth lens element L10 are aspheric plastic lenses, and the fourth lens element L4 is a spherical glass lens. Focal length: 4.7-9.4 mm; f number is 1.0-1.4; TTL _ W: 54.69 mm.
The parameters related to each lens in this embodiment, including surface type, radius of curvature, thickness, and refractive index, are shown in table 11 below:
Figure BDA0003189425960000181
Figure BDA0003189425960000191
TABLE 11
The K value and the aspherical surface coefficient in this embodiment are shown in table 12 below:
Figure BDA0003189425960000192
Figure BDA0003189425960000201
TABLE 12
The variable interval values when changing from the wide angle end to the telephoto end are shown in table 13 below:
surface number Thickness of Wide angle end Telescope end
6 D1 9.21 1.04
9 D2 5.62 0.10
20 D3 1.17 6.69
Watch 13
With reference to fig. 15 and 16, the zoom lens according to the present embodiment can secure an ultra-large aperture throughout the entire zoom range from the wide-angle end to the telephoto end with a short stroke. The production cost is greatly reduced while various performances of the system are ensured. And can still ensure good resolution ratio at the high temperature of 80 ℃ and the low temperature of minus 40 ℃, and can not generate virtual coke at the high temperature and the low temperature.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and it is apparent to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A zoom lens comprises a compensation group (G1) with negative optical power, a first fixed group (G2) with positive optical power and a variable power group (G3) with positive optical power, which are sequentially arranged from the object side to the image side along the optical axis, and is characterized by further comprising a second fixed group (G4) positioned on the image side of the variable power group (G3), wherein in the process of variable power, the first fixed group (G2) and the second fixed group (G4) are fixed relative to the position of an image surface, and the compensation group (G1) and the variable power group (G3) can move along the optical axis.
2. A zoom lens according to claim 1, characterized in that the optical power of the second fixed group (G4) is positive.
3. The zoom lens according to claim 1, wherein the compensation group (G1) includes a first lens (L1) having negative optical power, a second lens (L2) having negative optical power, and a third lens (L3) having positive optical power, which are arranged in order from the object side to the image side.
4. The zoom lens according to claim 3, wherein the first lens (L1) is a convex-concave or concave-concave type lens, the second lens (L2) is a paraxial region convex-concave type lens, and the third lens (L3) is a paraxial region convex-concave type lens.
5. A zoom lens according to claim 1, characterized in that the first fixed group (G2) includes a fourth lens (L4) whose optical power is positive.
6. The zoom lens according to claim 5, wherein the fourth lens (L4) is a paraxial convex-concave lens.
7. The zoom lens according to claim 1, wherein the magnification-varying group (G3) includes, in order from the object side to the image side, a fifth lens (L5) having positive optical power, a sixth lens (L6) having negative optical power, a seventh lens (L7) having positive optical power, an eighth lens (L8) having negative optical power, a ninth lens (L9) having positive optical power, and a tenth lens (L10) having positive optical power;
the sixth lens (L6) and the seventh lens (L7) are cemented to form a cemented lens group.
8. The zoom lens according to claim 7, wherein the fifth lens (L5) is a convex-convex type lens, the sixth lens (L6) is a convex-concave type lens, the seventh lens (L7) is a convex-concave or convex-convex type lens, the eighth lens (L8) is a paraxial region convex-concave type lens, the ninth lens (L9) is a paraxial region convex-convex or concave-convex type lens, and the tenth lens (L10) is a paraxial region convex-concave type lens.
9. A zoom lens according to claim 1, characterized in that the second fixed group (G4) includes an eleventh lens (L11) having positive optical power.
10. The zoom lens according to claim 9, wherein the eleventh lens (L11) is a paraxial convex or concave-convex lens.
CN202110871767.1A 2021-07-30 2021-07-30 Zoom lens Pending CN113534425A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114089519A (en) * 2021-12-08 2022-02-25 舜宇光学(中山)有限公司 Zoom lens
CN115480381A (en) * 2022-09-26 2022-12-16 舜宇光学(中山)有限公司 zoom lens

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JPS58160912A (en) * 1982-03-19 1983-09-24 Canon Inc Zoom lens
JPH05181061A (en) * 1992-01-06 1993-07-23 Canon Inc Compact zoom lens
US5920427A (en) * 1995-03-03 1999-07-06 Olympus Optical Co., Ltd. Keplerian variable magnification finder
US20170293120A1 (en) * 2016-04-12 2017-10-12 Canon Kabushiki Kaisha Image pickup apparatus
CN217543517U (en) * 2021-07-30 2022-10-04 舜宇光学(中山)有限公司 Zoom lens

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Publication number Priority date Publication date Assignee Title
JPS58160912A (en) * 1982-03-19 1983-09-24 Canon Inc Zoom lens
JPH05181061A (en) * 1992-01-06 1993-07-23 Canon Inc Compact zoom lens
US5920427A (en) * 1995-03-03 1999-07-06 Olympus Optical Co., Ltd. Keplerian variable magnification finder
US20170293120A1 (en) * 2016-04-12 2017-10-12 Canon Kabushiki Kaisha Image pickup apparatus
CN217543517U (en) * 2021-07-30 2022-10-04 舜宇光学(中山)有限公司 Zoom lens

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114089519A (en) * 2021-12-08 2022-02-25 舜宇光学(中山)有限公司 Zoom lens
CN115480381A (en) * 2022-09-26 2022-12-16 舜宇光学(中山)有限公司 zoom lens
CN115480381B (en) * 2022-09-26 2024-11-19 舜宇光学(中山)有限公司 Zoom lens

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