CN114740609B - Front-mounted doubling mirror and imaging device - Google Patents
Front-mounted doubling mirror and imaging device Download PDFInfo
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- CN114740609B CN114740609B CN202210214380.3A CN202210214380A CN114740609B CN 114740609 B CN114740609 B CN 114740609B CN 202210214380 A CN202210214380 A CN 202210214380A CN 114740609 B CN114740609 B CN 114740609B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 52
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Classifications
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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
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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
- 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
- G02B15/142—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 two groups only
- G02B15/1425—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 two groups only the first group being negative
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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
- G02B15/16—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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
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- Optics & Photonics (AREA)
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Abstract
The invention relates to the field of optics, in particular to a front magnifying glass and an imaging device. The front doubling lens consists of a first lens group with negative focal power and a second lens group with positive focal power from the object plane side to the image plane side; the lenses in the front doubling lens are composed of spherical lenses; the front doubling lens only comprises one group of cemented lenses. The imaging quality of the main lens which can be adapted is improved, the cost of the doubling lens is not greatly increased, meanwhile, the volume of the doubling lens is not greatly influenced by imaging, the miniaturization of the doubling lens is realized, and the imaging quality of the main lens is improved.
Description
Technical Field
The invention relates to the field of optics, in particular to a front 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, meanwhile, in order to reduce the size of the doubling lens, the size of the doubling lens can be reduced only through a large number of aspheric surfaces, so that the cost of the doubling lens is greatly increased, and imaging quality is reduced if the aspheric surfaces are reduced.
Disclosure of Invention
The invention solves the existing technical problems, provides the front doubling mirror and the imaging device, can increase the imaging quality of the main lens which can be adapted, can not greatly increase the cost of the doubling mirror, can not greatly influence the volume of the doubling mirror by imaging, realizes the miniaturization of the doubling mirror, and increases the imaging quality of the main lens.
The technical scheme provided by the invention is as follows:
a pre-magnification lens, comprising, in order from an object plane side to an image plane side:
a first lens group having negative optical power and a second lens group having positive optical power;
the lenses in the front doubling lens are composed of spherical lenses;
the front doubling lens only comprises one group of cemented lenses.
In the technical scheme, the cost of the front doubling lens is greatly reduced through the arrangement of the spherical lenses, and meanwhile, the use of the aspheric surfaces is reduced and the cost of the doubling lens is reduced through the limitation of the number of the cemented lenses; the imaging quality of the main lens which can be adapted is improved, the cost of the doubling lens is not greatly increased, meanwhile, the volume of the doubling lens is not greatly influenced by imaging, the miniaturization of the doubling lens is realized, and the imaging quality of the main lens is improved.
Preferably, the outer diameter of the lens in the pre-magnification lens gradually decreases from the object plane side to the image plane side.
In the technical scheme, the limit of the outer diameter of the lens in the front doubling lens reduces the possibility of light dissipation in the front doubling lens and increases the imaging light flux; meanwhile, the lens of the front doubling mirror can be smoother, the structural strength of the front doubling mirror is increased, and the safety of the front doubling mirror is improved.
Preferably, the cemented lens is disposed at an end of the front magnifier near the image plane side.
In the technical scheme, the imaging quality of the main lens is improved through the limitation of the position of the cemented lens, and meanwhile, the two lenses with smaller volumes are cemented, so that the cost of the front doubling lens is reduced.
Preferably, the first lens group includes at least a first lens of positive power and a fifth lens of negative power.
Preferably, at least one lens with positive focal power and at least one lens with negative focal power are arranged between the first lens and the fifth lens.
Preferably, the first lens group is composed of a first lens with positive focal power, a second lens with positive focal power, a third lens with negative focal power, a fourth lens with negative focal power and a fifth lens with negative focal power.
Preferably, the first lens group is composed of a first lens with positive optical power, a second lens with positive optical power, a third lens with negative optical power, and a fifth lens with negative optical power.
Preferably, the second lens and the third lens are both meniscus lenses, and the second lens and the third lens are both curved toward the object plane side.
In the technical scheme, the angle of light entering the second lens group is further adjusted through the second lens and the third lens, and the imaging quality of the main lens is improved.
Preferably, the second lens group includes, in order from the object plane side to the image plane side:
a sixth lens of positive power and a seventh lens of negative power, the sixth lens and the seventh lens being cemented.
Preferably, by limiting the parameters, the second lens and the third lens can adjust aberration and coma, and have less influence on the trend of the light path, thereby increasing the imaging quality of the main lens.
In the technical scheme, through the limitation of the parameters, the second lens and the third lens can adjust the aberration and the coma aberration, the influence on the trend of the light path is small, and the imaging quality of the main lens is improved.
Preferably, the pre-magnifier satisfies the following conditional expression:
TD1＞TD2＞TD3；
wherein TD1 to TD3 are the differences between the thicknesses of the center thickness and the edge thickness of the first lens to the third lens, respectively.
In the technical scheme, the imaging quality between the light path on the main optical axis and the upper light and the lower light is further reduced by limiting the parameters, and the imaging quality of the main lens is increased.
Preferably, the pre-magnifier satisfies the following conditional expression:
|(R52+R61)/(R52-R61)|＞5；
wherein R52 is a radius of curvature of the fifth lens element near the image-side curved surface, and R61 is a radius of curvature of the sixth lens element near the object-side curved surface.
In the technical scheme, through the limitation of the parameters, the distance between the first lens group and the second lens group is reduced, the miniaturization of the front doubling lens is realized, the effective calibers of the fifth lens and the sixth lens are also reduced, the outer diameters of the fifth lens and the sixth lens are further reduced, and the miniaturization of the front doubling lens in the radial direction is further realized.
Preferably, the pre-magnifier satisfies the following conditional expression:
|(R72+R11)/(R72-R11)|＞3；
wherein R11 is a radius of curvature of the first lens element near the object-side curved surface, and R72 is a radius of curvature of the seventh lens element near the image-side curved surface.
In the technical scheme, the difference between the curvature radiuses of the curved surfaces of the first lens and the seventh lens is reduced by limiting the curvature radiuses of the curved surfaces of the first lens and the seventh lens, so that the field angle of the main lens when receiving light rays can be as consistent as possible with the field angle of the front doubling lens, the possibility of aberration and coma aberration is reduced, and the imaging quality 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 front 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 front doubling mirror and the imaging device provided by the invention have the following beneficial effects:
1. the cost of the front doubling lens is greatly reduced through the arrangement of the spherical lenses, and meanwhile, the use of the aspheric surfaces is reduced and the cost of the doubling lens is reduced through the limitation of the number of the cemented lenses; the imaging quality of the main lens which can be adapted is improved, the cost of the doubling lens is not greatly increased, meanwhile, the volume of the doubling lens is not greatly influenced by imaging, the miniaturization of the doubling lens is realized, and the imaging quality of the main lens is improved.
2. The limit of the outer diameter of the lens in the front doubling lens reduces the possibility of light dissipation in the front doubling lens and increases the imaging light quantity; meanwhile, the lens of the front doubling mirror can be smoother, the structural strength of the front doubling mirror is increased, and the safety of the front doubling mirror is improved.
3. By limiting the parameters, the distance between the first lens group and the second lens group is reduced, the miniaturization of the front doubling lens is realized, the effective calibers of the fifth lens and the sixth lens are also reduced, the outer diameters of the fifth lens and the sixth lens are further reduced, and the miniaturization of the front doubling lens in the radial direction is further realized.
4. By limiting the curvature radius of the curved surfaces of the first lens and the seventh lens, the difference between the curvature radius of the curved surfaces of the two curved surfaces is reduced, so that the field angle of the main lens when receiving light rays can be as consistent as possible with the field angle of the front doubling lens, the possibility of aberration and coma is reduced, and the imaging quality is improved.
Drawings
The foregoing features, technical features, advantages and implementation of a pre-magnification lens 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 front magnifier according to the present invention;
FIG. 2 is a schematic view of another configuration of a front magnifier according to the present invention;
FIG. 3 is a schematic view of another image forming apparatus according to the present invention;
fig. 4 is a coma view of a telescopic state of another imaging apparatus of the present invention;
fig. 5 is an aberration diagram of another imaging apparatus of the present invention in a telescopic state;
fig. 6 is a coma view of a wide-angle state of another imaging apparatus of the present invention;
fig. 7 is an aberration diagram of another imaging device of the present invention in the wide-angle state;
FIG. 8 is a schematic view of a structure of a further pre-magnifier according to the present invention;
fig. 9 is a schematic structural view of still another image forming apparatus of the present invention;
fig. 10 is a coma view of a telescopic state of the imaging apparatus of the present invention;
fig. 11 is an aberration diagram of still another imaging apparatus in a telescopic state of the present invention;
fig. 12 is a coma view of still another wide-angle state of the imaging apparatus of the present invention;
fig. 13 is an aberration diagram of still another imaging apparatus of the present invention in a wide-angle state.
Reference numerals illustrate: g1, a magnifying glass; g2, a main lens; g1, a first lens group; g2, a second 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; and L7, a seventh 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, 2 and 8, a pre-magnification lens G1, the pre-magnification lens G1 includes, in order from an object plane side to an image plane side:
a first lens group g1 having negative optical power and a second lens group g2 having positive optical power;
the lenses in the front doubling lens G1 are all composed of spherical lenses;
the front magnifier G1 only comprises one group of cemented lens.
In the embodiment, the cost of the front doubling mirror G1 is greatly reduced through the arrangement of the spherical lenses, and meanwhile, the use of aspheric surfaces is reduced and the cost of the doubling mirror G1 is reduced through the limitation of the number of the cemented lenses; the imaging quality of the main lens G2 which can be matched is improved, the cost of the doubling lens G1 is not greatly increased, meanwhile, the size of the doubling lens G1 is not greatly influenced by imaging, the miniaturization of the doubling lens G1 is realized, and the imaging quality of the main lens G2 is improved.
The outer diameter of the lens in the front magnifier G1 gradually decreases from the object plane side to the image plane side.
In the embodiment, through the limitation of the outer diameter of the lens in the front doubling lens G1, the possibility of light dissipation in the front doubling lens G1 is reduced, and the imaging light flux is increased; meanwhile, the lens of the front doubling mirror G1 can be smoother, the structural strength of the front doubling mirror G1 is increased, and the safety of the front doubling mirror G1 is improved.
The cemented lens is disposed at one end of the front magnifier G1 near the image plane side.
In this embodiment, the imaging quality of the main lens G2 is increased by limiting the position of the cemented lens, and simultaneously, two lenses with smaller volumes are cemented, thereby reducing the cost of the front doubling lens G1.
The first lens group g1 includes at least a first lens L1 having positive power and a fifth lens L5 having negative power.
At least one lens with positive focal power and at least one lens with negative focal power are arranged between the first lens L1 and the fifth lens L5.
The second lens group g2 includes, in order from the object plane side to the image plane side:
a sixth lens L6 of positive power and a seventh lens L7 of negative power, the sixth lens L6 and the seventh lens L7 being cemented.
Example 2
As shown in fig. 2 and 8, in the present embodiment, the first lens group g1 is composed of a first lens L1 of positive power, a second lens L2 of positive power, a third lens L3 of negative power, a fourth lens L4 of negative power, and a fifth lens L5 of negative power, on the basis of embodiment 1.
Or the first lens group g1 is composed of a first lens L1 with positive focal power, a second lens L2 with positive focal power, a third lens L3 with negative focal power and a fifth lens L5 with negative focal power.
The second lens L2 and the third lens L3 are meniscus lenses, and the second lens L2 and the third lens L3 are curved toward the object plane side.
In the present embodiment, the angle of the light entering the second lens group G2 is further adjusted by the second lens L2 and the third lens L3, so as to increase the imaging quality of the main lens G2.
The front magnifier G1 satisfies the following conditional expression:
|fL1|＜|fL2|＜|fL3|；
wherein fL1 to fL3 are focal lengths of the first lens L1 to the third lens L3.
In this embodiment, by limiting the parameters, the second lens L2 and the third lens L3 can adjust aberration and coma, and have less influence on the trend of the optical path, thereby increasing the imaging quality of the main lens G2.
The front magnifier G1 satisfies the following conditional expression:
TD1＞TD2＞TD3；
wherein TD1 to TD3 are the differences between the thicknesses of the center thickness and the edge thickness of the first lens L1 to the third lens L3, respectively.
In this embodiment, by limiting the above parameters, the imaging quality between the optical path on the main optical axis and the up-down light is further reduced, and the imaging quality of the main lens G2 is increased.
The front magnifier G1 satisfies the following conditional expression:
|(R52+R61)/(R52-R61)|＞5；
wherein R52 is a radius of curvature of the fifth lens L5 near the image-side curved surface, and R61 is a radius of curvature of the sixth lens L6 near the object-side curved surface.
By limiting the parameters, the distance between the first lens group G1 and the second lens group G2 is reduced, the miniaturization of the front doubling lens G1 is realized, the effective calibers of the fifth lens L5 and the sixth lens L6 are also reduced, the outer diameters of the fifth lens L5 and the sixth lens L6 are then reduced, and the miniaturization of the front doubling lens G1 in the radial direction is further realized.
The front magnifier G1 satisfies the following conditional expression:
|(R72+R11)/(R72-R11)|＞3；
wherein R11 is a radius of curvature of the first lens L1 near the object-side curved surface, and R72 is a radius of curvature of the seventh lens L7 near the image-side curved surface.
By limiting the curvature radius of the curved surfaces of the first lens L1 and the seventh lens L7, the difference between the curvature radius of the curved surfaces of the two curved surfaces is reduced, so that the field angle of the main lens G2 when receiving light rays can be consistent with the field angle of the front doubling mirror G1 as much as possible, the possibility of aberration and coma is reduced, and the imaging quality is improved.
Example 3
As shown in fig. 2 to 7, an image forming apparatus includes, in order from an object surface side to an image surface side:
a front magnifier G1;
a main lens G2;
and an imaging element configured to receive an image formed by the main lens G2.
The front magnifier G1 includes, in order from the object plane side to the image plane side:
a first lens group g1 having negative optical power and a second lens group g2 having positive optical power;
the first lens group g1 is composed of a first lens L1 with positive power, a second lens L2 with positive power, a third lens L3 with negative power, a fourth lens L4 with negative power, and a fifth lens L5 with negative power.
The second lens group g2 includes, in order from the object plane side to the image plane side:
a sixth lens L6 of positive power and a seventh lens L7 of negative power, the sixth lens L6 and the seventh lens L7 being cemented.
The basic lens data of the front 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 embodiment, ttl=99.14 mm;
TTL is the total optical length of the front magnifier G1.
fL1＝221.45mm，fL2＝356.28mm，fL3＝-1356.25mm；
Wherein fL1 to fL3 are focal lengths of the first lens L1 to the third lens L3.
TD1＝22.6mm-6.27mm＝16.33mm；
TD2＝12.24mm-3.99mm＝8.25mm；
TD3＝12.56mm-10.94mm＝1.62mm；
Wherein TD1 to TD3 are the differences between the thicknesses of the center thickness and the edge thickness of the first lens L1 to the third lens L3, respectively.
R52＝86.17mm，R61＝100.35mm；
|(R52+R61)/(R52-R61)|＝13.15；
Wherein R52 is a radius of curvature of the fifth lens L5 near the image-side curved surface, and R61 is a radius of curvature of the sixth lens L6 near the object-side curved surface.
R11＝122.22mm，R72＝123.84mm；
|(R72+R11)/(R72-R11)|＝151.9；
Wherein R11 is a radius of curvature of the first lens L1 near the object-side curved surface, and R72 is a radius of curvature of the seventh lens L7 near the image-side curved surface.
Example 4
As shown in fig. 8 to 13, an image forming apparatus includes, in order from an object surface side to an image surface side:
a front magnifier G1;
a main lens G2;
and an imaging element configured to receive an image formed by the main lens G2.
The front magnifier G1 includes, in order from the object plane side to the image plane side:
a first lens group g1 having negative optical power and a second lens group g2 having positive optical power;
the first lens group g1 is composed of a first lens L1 with positive power, a second lens L2 with positive power, a third lens L3 with negative power, a fourth lens L4 with negative power, and a fifth lens L5 with negative power.
The second lens group g2 includes, in order from the object plane side to the image plane side:
a sixth lens L6 of positive power and a seventh lens L7 of negative power, the sixth lens L6 and the seventh lens L7 being cemented.
The basic lens data of the front 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 | 15.66 | 2.94 |
| D4 | 4.39 | 26.43 |
| D5 | 12.86 | 3.4 |
[ Table 8 ]
In this embodiment, ttl= 110.52mm;
TTL is the total optical length of the front magnifier G1.
fL1＝221.45mm，fL2＝386.07mm，fL3＝-507.65mm；
Wherein fL1 to fL3 are focal lengths of the first lens L1 to the third lens L3.
TD1＝24.23mm-8.22mm＝16.01mm；
TD2＝10.49mm-2.47mm＝8.02mm；
TD3＝12.71mm-10.7mm＝2.01mm；
Wherein TD1 to TD3 are the differences between the thicknesses of the center thickness and the edge thickness of the first lens L1 to the third lens L3, respectively.
R52＝80.03mm，R61＝114.03mm；
|(R52+R61)/(R52-R61)|＝5.7；
Wherein R52 is a radius of curvature of the fifth lens L5 near the image-side curved surface, and R61 is a radius of curvature of the sixth lens L6 near the object-side curved surface.
R11＝118.02mm，R72＝205.45mm；
|(R72+R11)/(R72-R11)|＝3.7；
Wherein R11 is a radius of curvature of the first lens L1 near the object-side curved surface, and R72 is a radius of curvature of the seventh lens L7 near the image-side curved surface.
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 (9)
1. The front doubling lens is characterized by comprising a first lens group with negative focal power and a second lens group with positive focal power from an object plane side to an image plane side;
the lenses in the front doubling lens are composed of spherical lenses;
the front doubling lens only comprises one group of cemented lens;
the first lens group consists of a first lens with positive focal power, a second lens with positive focal power, a third lens with negative focal power, a fourth lens with negative focal power and a fifth lens with negative focal power;
the second lens and the third lens are meniscus lenses, and the second lens and the third lens are bent towards the object plane side;
the second lens group is composed of a sixth lens with positive focal power and a seventh lens with negative focal power from the object plane side to the image plane side, and the sixth lens and the seventh lens are glued;
the front doubling mirror meets the following conditional expression:
|（R52+R61）/（R52-R61）|＞5；
|（R72+R11）/（R72-R11）|＞3；
wherein R52 is a radius of curvature of the fifth lens element near the image-side curved surface, and R61 is a radius of curvature of the sixth lens element near the object-side curved surface; r11 is a radius of curvature of the first lens element near the object-side curved surface, and R72 is a radius of curvature of the seventh lens element near the image-side curved surface.
2. A front magnifier according to claim 1, wherein:
the outer diameter of the lens in the front magnifier gradually decreases from the object plane side to the image plane side.
3. A front magnifier according to claim 2, wherein:
the cemented lens is arranged at one end of the front doubling lens, which is close to the image plane side.
4. A front magnifier according to claim 1, wherein:
the first lens group includes at least a first lens of positive optical power and a fifth lens of negative optical power.
5. The front magnifier according to claim 4, wherein:
at least one lens with positive focal power and at least one lens with negative focal power are arranged between the first lens and the fifth lens.
6. A front magnifier according to claim 5, wherein:
the first lens group consists of a first lens with positive focal power, a second lens with positive focal power, a third lens with negative focal power and a fifth lens with negative focal power.
7. A pre-magnification lens according to claim 1 or 6, wherein:
the front doubling mirror meets the following conditional expression:
|fL1|＜|fL2|＜|fL3|；
wherein fL1 to fL3 are focal lengths of the first lens to the third lens.
8. A pre-magnification lens according to claim 1 or 6, wherein:
the front doubling mirror meets the following conditional expression:
TD1＞TD2＞TD3；
wherein TD1 to TD3 are the differences between the thicknesses of the center thickness and the edge thickness of the first lens to the third lens, respectively.
9. An image forming apparatus, comprising, in order from an object plane side to an image plane side:
a pre-magnifier according to any one of claims 1 to 8;
a main lens;
and an imaging element configured to receive an image formed by the main lens.
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| CN114740609A (en) | 2022-07-12 |
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