CN114740610B - Magnifying glass and imaging device - Google Patents

Magnifying glass and imaging device Download PDF

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Publication number
CN114740610B
CN114740610B CN202210214393.0A CN202210214393A CN114740610B CN 114740610 B CN114740610 B CN 114740610B CN 202210214393 A CN202210214393 A CN 202210214393A CN 114740610 B CN114740610 B CN 114740610B
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Prior art keywords
lens
magnifier
plane side
lens group
outer diameter
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CN114740610A (en
Inventor
王若可
高泽峰
赵标
傅玉宏
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Jiaxing Zhongrun Optical Technology Co Ltd
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Jiaxing Zhongrun Optical Technology Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/02—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective
    • G02B15/10—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective by adding a part, e.g. close-up attachment
    • 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
    • G02B15/143—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 three groups only
    • G02B15/1431—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 three groups only the first group being positive
    • G02B15/143101—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 three groups only the first group being positive arranged +--
    • 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
    • G02B15/163—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 first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
    • G02B15/167—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 first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
    • G02B15/17—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 first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +--

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

Abstract

The invention relates to the field of optics, in particular to a magnifying glass and an imaging device. The magnification lens comprises a first lens group with positive focal power, a second lens group with negative focal power and a third lens group with negative focal power from an object plane side to an image plane side; the magnifier satisfies the following conditional expression: TTL < 135mm;0.35 < (phi max-phi min)/TTL < 0.6; wherein Φmax is the outer diameter of the lens with the largest outer diameter in the magnifier, Φmin is the outer diameter of the lens with the smallest outer diameter in the magnifier, and TTL is the total optical length of the magnifier. The possibility of overlarge outer diameter of the doubling lens is reduced, the half field angle of the main lens can be limited, and meanwhile, the doubling reliability of the main lens can be improved.

Description

Magnifying glass and imaging device
Technical Field
The invention relates to the field of optics, in particular to a magnifying glass and an imaging device.
Background
With the development of science, the security market is continuously advancing. Today, with the continuous maturation of advanced video compression coding technology, the rapid development of IP-based network transmission and the application of digital zoom technology, ultra-high definition cameras with 4k/8k resolution have been proposed in the market.
However, in the process of network transmission and digital zooming, the definition (i.e. resolution) of the video is reduced to a certain extent, but at the same time, the requirements of people on the resolution of the image are higher and higher, and the requirements on the angle of view which can be observed are also higher and higher, so that the conventional lens is additionally provided with a magnifying glass, and the lens meets the higher requirements of clients.
The existing doubling lens is large in size generally, meanwhile, the applicable main lens is large in size, after the main lens is matched, the half field angle of the lens is still too large, the use is difficult, and the application range of the doubling lens is reduced.
Disclosure of Invention
The invention solves the existing technical problems, provides the doubling mirror and the imaging device, reduces the possibility of overlarge outer diameter of the doubling mirror, can limit the half field angle of the main lens, and can increase the doubling reliability of the main lens.
The technical scheme provided by the invention is as follows:
a magnifier, comprising, in order from an object plane side to an image plane side:
a first lens group of positive optical power, a second lens group of negative optical power, and a third lens group of negative optical power;
the magnifier satisfies the following conditional expression:
TTL＜135mm；
0.35＜(Φmax-Φmin)/TTL＜0.6；
wherein Φmax is the outer diameter of the lens with the largest outer diameter in the magnifier, Φmin is the outer diameter of the lens with the smallest outer diameter in the magnifier, and TTL is the total optical length of the magnifier.
In the technical scheme, the limit of the optical total length of the doubling lens reduces the total length of the main lens after the doubling lens is installed, the doubling lens can be suitable for the main lens with larger volume, and the range of the main lens suitable for the doubling lens is increased; through the limiting of the outer diameter of the inner lens of the doubling lens, the possibility of overlarge outer diameter of the doubling lens is reduced, meanwhile, the half field angle of the main lens can be limited, and meanwhile, the doubling reliability of the main lens can be improved.
Preferably, the magnifying glass comprises at most one cemented lens.
In the technical scheme, the size of the doubling lens is reduced to a certain extent through the arrangement of the bonding lens, the imaging quality of the main lens can be increased, and the cost of the doubling lens is reduced.
Preferably, the second lens group includes, in order from an object plane side to an image plane side: a fourth lens of negative optical power and a fifth lens of negative optical power.
Preferably, the second lens group satisfies the following conditional expression:
0.5＜R42/R51＜2；
wherein R42 is a radius of curvature of the fourth lens element near the image-side curved surface, and R51 is a radius of curvature of the fifth lens element near the object-side curved surface.
In the technical scheme, through the limitation of the curvature radius of one side of the fourth lens and the fifth lens, the possibility that light passes through the fourth lens to the fifth lens to generate aberration and coma is reduced, the gap between the fourth lens and the fifth lens is also reduced, and the miniaturization of the doubling lens is realized.
Preferably, the third lens group includes, in order from an object plane side to an image plane side: a sixth lens of positive optical power, a seventh lens of positive optical power and an eighth lens of negative optical power, the seventh lens and the eighth lens being cemented.
Preferably, the third lens group satisfies the following conditional expression:
nd7＝nd8；
vd7＜vd8；
where nd7 and nd8 are refractive indices of the seventh lens and the eighth lens, respectively, and vd7 and vd8 are abbe numbers of the seventh lens and the eighth lens, respectively.
In the technical scheme, through the limitation of parameters of the seventh lens and the eighth lens, the possibility that light rays pass through the seventh lens to the eighth lens to generate aberration and coma is reduced, and the imaging quality of the main lens is improved.
Preferably, an object plane side of the sixth lens is curved toward the object plane side.
According to the technical scheme, the object plane of the object plane side of the sixth lens can better receive light rays and correct the directions of the light rays through the limitation of the direction of the curved surface of the sixth lens, so that the possibility that the focal power of the seventh lens and the eighth lens is overlarge is reduced, and the possibility that the volumes of the seventh lens and the eighth lens are overlarge is further reduced.
Preferably, the first lens group includes, in order from an object plane side to an image plane side: a first lens of positive optical power and a second lens of positive optical power.
Or (b)
The first lens group sequentially comprises from an object plane side to an image plane side: a first lens of positive optical power and a third lens of positive optical power.
Preferably, the first lens and the second lens are the same material.
In the technical scheme, the possibility of overcorrection of the first lens to the light rays is reduced by limiting the materials of the first lens and the second lens, and the imaging quality is further improved.
Preferably, the first lens group satisfies the following conditional expression:
φ1/TTL＞0.8；
wherein phi 1 is the outer diameter of the first lens.
In the technical scheme, through the limitation of the outer diameter of the first lens group, the possibility of overlarge total length of the doubling lens is reduced, meanwhile, the outer diameter of the first lens can be increased, the main lens which can be matched with the doubling lens is increased, and the application range of the doubling lens is increased.
Preferably, the first lens group satisfies the following conditional expression:
R11/TTL＜0.9；
wherein R11 is the curvature radius of the curved surface of the first lens close to the object plane side.
In the technical scheme, the light absorption capacity of the doubling mirror is further increased through the limitation of the curvature radius of the object plane side of the first lens, and the doubling reliability of the doubling mirror is increased.
Preferably, the first lens group satisfies the following conditional expression:
|(R31+R11)/(R31-R11)|＜1.2；
or (b)
|(R32+R11)/(R32-R11)|＜1.1；
Wherein R31 is a radius of curvature of the third lens element near the object-side curved surface, and R32 is a radius of curvature of the third lens element near the image-side curved surface.
In the technical scheme, by limiting the parameters of the first lens group, the curvature radius of curved surfaces at two sides of the first lens group is increased, and chromatic aberration and aberration adjustment are realized under the condition that the influence of the first lens group on an optical path is reduced.
Preferably, the magnifier satisfies the following conditional expression:
0.1＜DG23/TTL＜0.3；
wherein DG23 is a pitch between the second lens group and the third lens group.
According to the technical scheme, through the limitation of the parameters, on the basis that miniaturization of the magnifier can be achieved, enough space can be provided for the third lens group, the third lens group can conveniently adjust chromatic aberration and aberration of the magnifier, and imaging quality of the magnifier is improved.
It is also an object of the present invention to provide an image forming apparatus including, in order from an object plane side to an image plane side: a magnifying glass; a main lens; and an imaging element configured to receive an image formed by the main lens.
Compared with the prior art, the doubling mirror and the imaging device provided by the invention have the following beneficial effects:
1. the total length of the main lens after the magnifying glass is installed is reduced by limiting the optical total length of the magnifying glass, the magnifying glass can be suitable for the main lens with larger volume, and the range of the main lens suitable for the magnifying glass is increased; through the limiting of the outer diameter of the inner lens of the doubling lens, the possibility of overlarge outer diameter of the doubling lens is reduced, meanwhile, the half field angle of the main lens can be limited, and meanwhile, the doubling reliability of the main lens can be improved.
2. By limiting the curvature radius of one side of the fourth lens and the fifth lens, the possibility that light rays pass through the fourth lens to the fifth lens to generate aberration and coma is reduced, the gap between the fourth lens and the fifth lens is also reduced, and the miniaturization of the doubling lens is realized.
3. By limiting the direction of the curved surface of the sixth lens, the object plane on the object plane side of the sixth lens can better receive light rays and correct the directions of the light rays, so that the possibility of overlarge focal power of the seventh lens and the eighth lens is reduced, and the possibility of overlarge volumes of the seventh lens and the eighth lens is further reduced.
4. The light absorption capacity of the doubling mirror is further increased and the doubling reliability of the doubling mirror is increased by limiting the curvature radius of the object plane side of the first lens.
Drawings
The above features, technical features, advantages and implementation of a magnifier and imaging device will be further described in the following description of preferred embodiments with reference to the accompanying drawings in a clearly understandable manner.
FIG. 1 is a schematic view of a magnifier according to the present invention;
FIG. 2 is a schematic view of an image forming apparatus according to the present invention;
fig. 3 is a coma view of a telescopic state of an imaging apparatus according to the present invention;
fig. 4 is an aberration diagram of a telescopic state of an imaging apparatus of the present invention;
fig. 5 is a coma view of a wide-angle state of an imaging apparatus of the present invention;
fig. 6 is an aberration diagram of an imaging device in a wide-angle state of the present invention;
FIG. 7 is a schematic view of another magnifier according to the present invention;
fig. 8 is a schematic view of a structure of another image forming apparatus of the present invention;
fig. 9 is a coma view of a telescopic state of another imaging apparatus of the present invention;
fig. 10 is an aberration diagram of another imaging device of the present invention in a telescopic state;
fig. 11 is a coma view of a wide-angle state of another imaging apparatus of the present invention;
fig. 12 is an aberration diagram of another imaging device of the present invention in the wide-angle state.
Reference numerals illustrate: g1, a magnifying glass; g2, a main lens; g1, a first lens group; g2, a second lens group; g3, a third lens group; l1, a first lens; l2, a second lens; l3, a third lens; l4, a fourth lens; l5, a fifth lens; l6, sixth lens; l7, seventh lens; l8, eighth lens.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
For simplicity of the drawing, only the parts relevant to the invention are schematically shown in each drawing, and they do not represent the actual structure thereof as a product. Additionally, in order to simplify the drawing for ease of understanding, components having the same structure or function in some of the drawings are shown schematically with only one of them, or only one of them is labeled. Herein, "a" means not only "only this one" but also "more than one" case.
Example 1
As shown in fig. 1 and 7, a magnifier G1, the magnifier G1 includes, in order from an object plane side to an image plane side:
a first lens group g1 of positive power, a second lens group g2 of negative power, and a third lens group g3 of negative power;
the magnifier G1 satisfies the following conditional expression:
TTL＜135mm；
0.35＜(Φmax-Φmin)/TTL＜0.6；
wherein Φmax is the outer diameter of the lens with the largest outer diameter in the magnifier G1, Φmin is the outer diameter of the lens with the smallest outer diameter in the magnifier G1, and TTL is the total optical length of the magnifier G1.
In this embodiment, the limitation of the optical total length of the magnifier G1 reduces the total length of the main lens G2 after the magnifier G1 is mounted, the magnifier G1 can be applied to the main lens G2 with larger volume, and the range of the main lens G2 to which the magnifier G1 can be applied is increased; through the external diameter limitation of the inner lens of the doubling lens G1, the possibility of overlarge external diameter of the doubling lens G1 is reduced, the half field angle of the main lens G2 can be limited, and meanwhile, the doubling reliability of the main lens G2 can be improved.
The magnifier G1 includes at most one cemented lens.
In this embodiment, by setting a cemented lens, the volume of the magnifier G1 is reduced to a certain extent, and at the same time, the imaging quality of the main lens G2 is also increased, and at the same time, the cost of the magnifier G1 is also reduced.
The second lens group g2 includes, in order from an object plane side to an image plane side: a fourth lens L4 of negative power and a fifth lens L5 of negative power.
The second lens group g2 satisfies the following conditional expression:
0.5＜R42/R51＜2；
wherein R42 is a radius of curvature of the fourth lens L4 near the image-side curved surface, and R51 is a radius of curvature of the fifth lens L5 near the object-side curved surface.
By limiting the curvature radius of the fourth lens L4 and the fifth lens L5 at one side close to each other, the possibility that aberration and coma are generated when light passes through the fourth lens L4 to the fifth lens L5 is reduced, the gap between the fourth lens L4 and the fifth lens L5 is also reduced, and the miniaturization of the magnifier G1 is realized.
The third lens group g3 includes, in order from an object plane side to an image plane side: a sixth lens L6 of positive power, a seventh lens L7 of positive power, and an eighth lens L8 of negative power, the seventh lens L7 and the eighth lens L8 being cemented.
The third lens group g3 satisfies the following conditional expression:
nd7＝nd8；
vd7＜vd8；
where nd7 and nd8 are refractive indices of the seventh lens L7 and the eighth lens L8, respectively, and vd7 and vd8 are abbe numbers of the seventh lens L7 and the eighth lens L8, respectively.
By defining parameters of the seventh lens L7 and the eighth lens L8, the possibility of aberration and coma generated by light passing through the seventh lens L7 to the eighth lens L8 is reduced, and the imaging quality of the main lens G2 is increased.
An object plane side of the sixth lens L6 is curved toward the object plane side.
In this embodiment, by defining the direction of the curved surface of the sixth lens L6, the object plane on the object plane side of the sixth lens L6 can better receive light and correct the direction of the light, so as to reduce the possibility of excessively large optical power of the seventh lens L7 and the eighth lens L8, and further reduce the possibility of excessively large volumes of the seventh lens L7 and the eighth lens L8.
The first lens group g1 includes, in order from an object plane side to an image plane side: a first lens L1 of positive optical power and a second lens L2 of positive optical power.
Or (b)
The first lens group g1 includes, in order from an object plane side to an image plane side: a first lens L1 of positive optical power and a third lens L3 of positive optical power.
The first lens L1 and the second lens L2 are made of the same material.
By defining the materials of the first lens L1 and the second lens L2, the possibility of overcorrection of light by the first lens L1 is reduced, and the imaging quality is further increased.
The first lens group g1 satisfies the following conditional expression:
φ1/TTL＞0.8；
wherein phi 1 is the outer diameter of the first lens L1.
In this embodiment, through the limitation of the outer diameter of the first lens group G1, the possibility that the total length of the magnifier G1 is too large is reduced, and meanwhile, the outer diameter of the first lens L1 can be increased, the main lens G2 to which the magnifier G1 can be adapted is increased, and the application range of the magnifier G1 is increased.
The first lens group g1 satisfies the following conditional expression:
R11/TTL＜0.9；
wherein R11 is a radius of curvature of the first lens L1 near the object-side curved surface.
In this embodiment, the absorption capacity of the magnifier G1 for light is further increased by defining the curvature radius of the object plane side of the first lens L1, and the reliability of the magnification of the magnifier G1 is increased.
The first lens group g1 satisfies the following conditional expression:
|(R31+R11)/(R31-R11)|＜1.2；
or (b)
|(R32+R11)/(R32-R11)|＜1.1；
Wherein R31 is a radius of curvature of the third lens L3 near the object-side curved surface, and R32 is a radius of curvature of the third lens L3 near the image-side curved surface.
In this embodiment, by limiting the parameters of the first lens group g1, the curvature radius of the curved surfaces on both sides of the first lens group g1 is increased, and chromatic aberration and adjustment of aberration are achieved while the influence of the first lens group g1 on the optical path is reduced.
The magnifier G1 satisfies the following conditional expression:
0.1＜DG23/TTL＜0.3；
wherein DG23 is a pitch between the second lens group g2 and the third lens group g3.
In this embodiment, by limiting the parameters, on the basis that miniaturization of the magnifier G1 can be achieved, a sufficient space can be provided for the third lens group G3, so that the third lens group G3 can conveniently adjust chromatic aberration and aberration of the magnifier G1, and imaging quality of the magnifier G1 is improved.
Example 2
An image forming apparatus includes, in order from an object plane side to an image plane side:
a magnifier G1;
a main lens G2;
and an imaging element configured to receive an image formed by the main lens G2.
The magnifier G1 includes, in order from the object plane side to the image plane side:
a first lens group g1 of positive power, a second lens group g2 of negative power, and a third lens group g3 of negative power.
The first lens group g1 includes, in order from an object plane side to an image plane side: a first lens L1 of positive optical power and a second lens L2 of positive optical power.
The second lens group g2 includes, in order from an object plane side to an image plane side: a fourth lens L4 of negative power and a fifth lens L5 of negative power.
The third lens group g3 includes, in order from an object plane side to an image plane side: a sixth lens L6 of positive power, a seventh lens L7 of positive power, and an eighth lens L8 of negative power, the seventh lens L7 and the eighth lens L8 being cemented.
The basic lens data of the magnifier G1 of the present embodiment is shown in table 1, the basic lens data of the main lens G2 of the present embodiment is shown in table 2, the variable parameters in table 2 are shown in table 3, and the aspherical coefficients are shown in table 4.
The plane number column shows the plane number when the object-side plane is the 1 st plane and the number is increased one by one toward the image side; the surface type of a certain lens is shown in the surface type column; the curvature radius column shows the curvature radius of a certain lens, when the curvature radius is positive, the surface is bent towards the object side, and when the curvature radius is negative, the surface is bent towards the image side; the center thickness column shows the surface spacing on the optical axis of each surface from the surface adjacent to the image side thereof; the refractive index of a certain lens is shown in the refractive index column; the abbe number of a certain lens is shown in the abbe number column.
In table 3, the WIDE column indicates specific values of the respective variable parameters when the main lens G2 is in the WIDE-angle end state, and the TELE column indicates specific values of the respective variable parameters when the main lens G2 is in the telephoto end state.
In Table 4, K is the conic coefficient, E is the scientific count number, e.g., E-05 indicates 10 -5 。
[ Table 1 ]
[ Table 2 ]
[ Table 3 ]
WIDE TELE
D1 21.38 45.04
D2 27.19 1.76
D3 13.19 2.88
D4 4.26 26.2
D5 14.42 4.56
[ Table 4 ]
In this example, ttl= 112.92mm, Φmax= 119.37mm, Φmin= 59.91mm,
(Φmax-Φmin)/TTL＝0.527；
wherein Φmax is the outer diameter of the lens with the largest outer diameter in the magnifier G1, Φmin is the outer diameter of the lens with the smallest outer diameter in the magnifier G1, and TTL is the total optical length of the magnifier G1.
R42＝90.10mm，R51＝157.13mm，
R42/R51＝0.57；
Wherein R42 is a radius of curvature of the fourth lens L4 near the image-side curved surface, and R51 is a radius of curvature of the fifth lens L5 near the object-side curved surface.
nd7＝nd8＝1.81；
vd7＝22.76，vd8＝40.73；
Where nd7 and nd8 are refractive indices of the seventh lens L7 and the eighth lens L8, respectively, and vd7 and vd8 are abbe numbers of the seventh lens L7 and the eighth lens L8, respectively.
φ1＝119.37mm，φ1/TTL＝1.06；
Wherein phi 1 is the outer diameter of the first lens L1.
R11＝88.64mm，R11/TTL＝0.785；
Wherein R11 is a radius of curvature of the first lens L1 near the object-side curved surface.
DG23＝28.60mm，DG23/TTL＝0.253；
Wherein DG23 is a pitch between the second lens group g2 and the third lens group g3.
Example 3
An image forming apparatus includes, in order from an object plane side to an image plane side:
a magnifier G1;
a main lens G2;
and an imaging element configured to receive an image formed by the main lens G2.
The magnifier G1 includes, in order from the object plane side to the image plane side:
a first lens group g1 of positive power, a second lens group g2 of negative power, and a third lens group g3 of negative power.
The first lens group g1 includes, in order from an object plane side to an image plane side: a first lens L1 of positive optical power and a third lens L3 of positive optical power.
The second lens group g2 includes, in order from an object plane side to an image plane side: a fourth lens L4 of negative power and a fifth lens L5 of negative power.
The third lens group g3 includes, in order from an object plane side to an image plane side: a sixth lens L6 of positive power, a seventh lens L7 of positive power, and an eighth lens L8 of negative power, the seventh lens L7 and the eighth lens L8 being cemented.
The basic lens data of the magnifier G1 of the present embodiment is shown in table 5, the basic lens data of the main lens G2 of the present embodiment is shown in table 6, the variable parameters in table 6 are shown in table 7, and the aspherical coefficients are shown in table 8.
The plane number column shows the plane number when the object-side plane is the 1 st plane and the number is increased one by one toward the image side; the surface type of a certain lens is shown in the surface type column; the curvature radius column shows the curvature radius of a certain lens, when the curvature radius is positive, the surface is bent towards the object side, and when the curvature radius is negative, the surface is bent towards the image side; the center thickness column shows the surface spacing on the optical axis of each surface from the surface adjacent to the image side thereof; the refractive index of a certain lens is shown in the refractive index column; the abbe number of a certain lens is shown in the abbe number column.
In table 7, the WIDE column indicates specific values of the respective variable parameters when the main lens G2 is in the WIDE-angle end state, and the TELE column indicates specific values of the respective variable parameters when the main lens G2 is in the telephoto end state.
In Table 8, K is the conic coefficient, E is the scientific count number, e.g., E-05 indicates 10 -5 。
[ Table 5 ]
[ Table 6 ]
/>
[ Table 7 ]
WIDE TELE
D1 24.41 45.16
D2 22.12 1.51
D3 13.18 0.44
D4 4.38 26.45
D5 13.86 4.4
[ Table 8 ]
In this example, ttl= 131.21mm, Φmax= 114.68mm, Φmin=63.31 mm,
(Φmax-Φmin)/TTL＝0.392；
wherein Φmax is the outer diameter of the lens with the largest outer diameter in the magnifier G1, Φmin is the outer diameter of the lens with the smallest outer diameter in the magnifier G1, and TTL is the total optical length of the magnifier G1.
R42＝149.50mm，R51＝145.33mm，
R42/R51＝1.03；
Wherein R42 is a radius of curvature of the fourth lens L4 near the image-side curved surface, and R51 is a radius of curvature of the fifth lens L5 near the object-side curved surface.
nd7＝nd8＝1.81；
vd7＝22.76，vd8＝40.73；
Where nd7 and nd8 are refractive indices of the seventh lens L7 and the eighth lens L8, respectively, and vd7 and vd8 are abbe numbers of the seventh lens L7 and the eighth lens L8, respectively.
φ1＝114.68mm，φ1/TTL＝0.87；
Wherein phi 1 is the outer diameter of the first lens L1.
R11＝109.32mm，R11/TTL＝0.833；
Wherein R11 is a radius of curvature of the first lens L1 near the object-side curved surface.
R11＝109.32mm，R31＝1996.91mm，R32＝13115mm；
|(R31+R11)/(R31-R11)|＝1.12；
|(R32+R11)/(R32-R11)|＝1.02；
Wherein R31 is a radius of curvature of the third lens L3 near the object-side curved surface, and R32 is a radius of curvature of the third lens L3 near the image-side curved surface.
DG23＝18.67mm，DG23/TTL＝0.142；
Wherein DG23 is a pitch between the second lens group g2 and the third lens group g3.
It should be noted that the above embodiments can be freely combined as needed. The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims (11)

1. A magnifier, characterized in that the magnifier is composed of a first lens group with positive focal power, a second lens group with negative focal power and a third lens group with negative focal power from an object plane side to an image plane side;
the magnifier satisfies the following conditional expression:
TTL＜135mm；
0.35＜（Φmax-Φmin）/TTL＜0.6；
wherein Φmax is the outer diameter of the lens with the largest outer diameter in the magnifier, Φmin is the outer diameter of the lens with the smallest outer diameter in the magnifier, and TTL is the total optical length of the magnifier;
the first lens group comprises a first lens with positive focal power and a second lens with positive focal power from the object plane side to the image plane side;
or the first lens group is composed of a first lens with positive focal power and a third lens with positive focal power from the object plane side to the image plane side;
the second lens group is composed of a fourth lens with negative focal power and a fifth lens with negative focal power from the object plane side to the image plane side;
the third lens group is composed of a sixth lens with positive focal power, a seventh lens with positive focal power and an eighth lens with negative focal power from the object plane side to the image plane side, and the seventh lens and the eighth lens are glued.
2. A magnifier according to claim 1, wherein:
the magnifier comprises at most one cemented lens.
3. A magnifier according to claim 1, wherein:
the second lens group satisfies the following conditional expression:
0.5＜R42/R51＜2；
wherein R42 is a radius of curvature of the fourth lens element near the image-side curved surface, and R51 is a radius of curvature of the fifth lens element near the object-side curved surface.
4. A magnifier according to claim 1, wherein:
the third lens group satisfies the following conditional expression:
nd7=nd8；
vd7＜vd8；
where nd7 and nd8 are refractive indices of the seventh lens and the eighth lens, respectively, and vd7 and vd8 are abbe numbers of the seventh lens and the eighth lens, respectively.
5. A magnifier according to claim 1, wherein:
and the object plane side curved surface of the sixth lens is convex to the object plane side.
6. A magnifier according to claim 1, wherein:
the first lens and the second lens are made of the same material.
7. A magnifier according to claim 1, wherein:
the first lens group satisfies the following conditional expression:
φ1/TTL＞0.8；
wherein phi 1 is the outer diameter of the first lens.
8. A magnifier according to claim 7, wherein:
the first lens group satisfies the following conditional expression:
R11/TTL＜0.9；
wherein R11 is the curvature radius of the curved surface of the first lens close to the object plane side.
9. A magnifier according to claim 8, wherein:
the first lens group satisfies the following conditional expression:
|（R31+R11）/（R31-R11）|＜1.2；
|（R32+R11）/（R32-R11）|＜1.1；
wherein R31 is a radius of curvature of the third lens element near the object-side curved surface, and R32 is a radius of curvature of the third lens element near the image-side curved surface.
10. A magnifier according to claim 1, wherein:
the magnifier satisfies the following conditional expression:
0.1＜DG23/TTL＜0.3；
wherein DG23 is a pitch between the second lens group and the third lens group.
11. An image forming apparatus, comprising, in order from an object plane side to an image plane side:
a magnifier according to any one of claims 1 to 10;
a main lens;
and an imaging element configured to receive an image formed by the main lens.
CN202210214393.0A 2022-03-07 2022-03-07 Magnifying glass and imaging device Active CN114740610B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006106538A (en) * 2004-10-08 2006-04-20 Canon Inc Converter lens
JP2006106537A (en) * 2004-10-08 2006-04-20 Canon Inc Converter lens
CN103782217A (en) * 2011-08-30 2014-05-07 富士胶片株式会社 Variable magnification optical system and image-capturing device
CN104834078A (en) * 2014-02-07 2015-08-12 富士胶片株式会社 Teleconverter lens and imaging apparatus
CN109073868A (en) * 2016-02-01 2018-12-21 索尼公司 Increment lens and optical instrument

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006106538A (en) * 2004-10-08 2006-04-20 Canon Inc Converter lens
JP2006106537A (en) * 2004-10-08 2006-04-20 Canon Inc Converter lens
CN103782217A (en) * 2011-08-30 2014-05-07 富士胶片株式会社 Variable magnification optical system and image-capturing device
CN104834078A (en) * 2014-02-07 2015-08-12 富士胶片株式会社 Teleconverter lens and imaging apparatus
CN109073868A (en) * 2016-02-01 2018-12-21 索尼公司 Increment lens and optical instrument

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