CN116841023A - Dual-light zoom lens and imaging device - Google Patents
Dual-light zoom lens and imaging device Download PDFInfo
- Publication number
- CN116841023A CN116841023A CN202310629687.4A CN202310629687A CN116841023A CN 116841023 A CN116841023 A CN 116841023A CN 202310629687 A CN202310629687 A CN 202310629687A CN 116841023 A CN116841023 A CN 116841023A
- Authority
- CN
- China
- Prior art keywords
- lens
- focal power
- zoom lens
- lens group
- variable magnification
- 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
Links
- 238000003384 imaging method Methods 0.000 title claims abstract description 14
- 230000003287 optical effect Effects 0.000 claims description 26
- 206010010071 Coma Diseases 0.000 abstract description 9
- 230000004075 alteration Effects 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 6
- 230000005856 abnormality Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000006059 cover glass Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
-
- 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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—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
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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
- G02B15/146—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 more than five groups
- G02B15/1461—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 more than five groups the first group being positive
-
- 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
- G02B27/10—Beam splitting or combining systems
- G02B27/12—Beam splitting or combining systems operating by refraction only
- G02B27/126—The splitting element being a prism or prismatic array, including systems based on total internal reflection
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention relates to the field of optics, in particular to a dual-light zoom lens and an imaging device. The double-light zoom lens sequentially comprises a fixed lens group with positive focal power, a first zoom lens group with negative focal power, a second zoom lens group with positive focal power, a focusing lens group with negative focal power, an adjusting lens group with positive focal power and a beam splitter prism from an object plane side to an image plane side; the aberration and coma of the zoom lens are greatly reduced, the double-light zoom lens is miniaturized, larger multiplying power can be achieved, and the application range of the double-light zoom lens is increased.
Description
Technical Field
The invention relates to the field of optics, in particular to a dual-light zoom lens and an imaging device.
Background
The existing double-light lens is divided into a visible light path and an infrared light path by adopting a prism mode, two kinds of light rays are respectively received by adopting a double-sensor mode to generate two pictures to be fused, and due to the adoption of the beam-splitting prism, the rear group of the lens is greatly increased, so that the zoom lens with large and medium multiplying power is difficult to realize miniaturization.
Disclosure of Invention
The invention solves the existing technical problems, provides the dual-light zoom lens, greatly reduces aberration and coma of the zoom lens, realizes that the dual-light zoom lens can realize larger multiplying power on the basis of miniaturization, and increases the application range of the dual-light zoom lens.
The technical scheme provided by the invention is as follows:
the double-light zoom lens sequentially comprises a fixed lens group with positive focal power, a first zoom lens group with negative focal power, a second zoom lens group with positive focal power, a focusing lens group with negative focal power, an adjusting lens group with positive focal power and a beam splitter prism from an object plane side to an image plane side;
the first zoom lens group, the second zoom lens group, the focusing lens group and the adjusting lens group move along the main optical axis direction of the double-light zoom lens;
the second variable magnification lens group consists of a fifth variable magnification lens with positive focal power, a sixth variable magnification lens with negative focal power, a seventh variable magnification lens with positive focal power, an eighth variable magnification lens with negative focal power and a ninth variable magnification lens with positive focal power, wherein the sixth variable magnification lens is glued with the seventh variable magnification lens, and the eighth variable magnification lens is glued with the ninth variable magnification lens;
the dual-light zoom lens satisfies the following conditional expression:
ft/fw＞20；
XG2+DG2＞DG36；
wherein ft is a focal length of the telescopic state of the binary zoom lens, fw is a focal length of the wide-angle state of the binary zoom lens, XG2 is a moving distance of the first variable magnification lens group, DG2 is an optical total length of the first variable magnification lens group, and DG36 is an optical total length from the second variable magnification lens group to the beam splitter prism.
In the technical scheme, the number of moving groups in the zoom lens is greatly increased, the moving distance of the front group is increased to a certain extent, and the number of cemented lenses in the second zoom lens group after the diaphragm is increased, so that the aberration and coma of the zoom lens are greatly reduced, the double-light zoom lens is miniaturized, the larger multiplying power is realized, and the application range of the double-light zoom lens is increased.
Preferably, the second variable magnification lens group and the adjusting lens group are provided with one aspheric lens.
In the technical scheme, through the arrangement of a small number of aspheric lenses in the rear group, the double-light zoom lens is greatly reduced, the number of lenses is also reduced, and the miniaturization of the double-light zoom lens is realized.
Preferably, the first variable magnification lens group is composed of a first variable magnification lens of negative power, a second variable magnification lens of negative power, a third variable magnification lens of positive power and a fourth variable magnification lens of negative power.
Preferably, the fixed lens group is composed of a first fixed lens with negative focal power, a second fixed lens with positive focal power, a third fixed lens with positive focal power and a fourth fixed lens with positive focal power, and the first fixed lens and the second fixed lens are glued.
Preferably, the focusing lens group is a focusing lens with negative focal power.
Preferably, the adjusting lens group is composed of a first adjusting lens with negative focal power, a second adjusting lens with positive focal power, a third adjusting lens with positive focal power and a fourth adjusting lens with positive focal power, and the first adjusting lens and the second adjusting lens are glued.
Preferably, the adjusting lens group is a fourth adjusting lens with positive focal power.
Preferably, the fourth adjustment lens satisfies the following conditional expression:
4＜fd4/fw＜5；
wherein fd4 is the focal length of the fourth adjustment lens.
In the technical scheme, the definition of the fourth adjusting lens focal length realizes the correction of the image quality of the object plane side group of the adjusting lens group, and the imaging quality of the double-light zoom lens is improved.
Preferably, the adjustment lens group satisfies the following conditional expression:
3.5＜fG5/fw＜4.5；
wherein fG5 is the focal length of the adjusting lens group.
In the technical scheme, the limitation of the focal length of the adjusting lens group reduces the possibility of abnormality when light rays are emitted from the adjusting lens group, realizes the correction of the image quality of the object plane side group of the adjusting lens group, and increases the imaging quality of the dual-light zoom lens
Preferably, the binary zoom lens satisfies the following conditional expression:
0.8＜XG2/DG36＜1.2。
according to the technical scheme, through the limitation of the parameters, the moving distance of the first zoom lens group is increased, the optical total length of the first zoom lens group is reduced, meanwhile, the combination diaphragm can move along with the second zoom lens group, the optical total length of the dual-light zoom lens is further reduced, and the miniaturization of the dual-light zoom lens is realized.
Preferably, the binary zoom lens satisfies the following conditional expression:
0.25＜XG2/TTL＜0.3；
and TTL is the total optical length of the dual-light zoom lens.
In the technical scheme, the limitation of the moving distance of the first variable magnification lens group is further realized through the limitation of the parameters, the possibility that the moving distance of the first variable magnification lens group is overlarge is reduced, and the miniaturization of the double-light zoom lens is realized.
Preferably, the binary zoom lens satisfies the following conditional expression:
1.9＜ΦG1/ΦG2＜2；
Φg1 is the outer diameter of the fixed lens group, Φg2 is the outer diameter of the first variable magnification lens group.
In the technical scheme, the definition of the aperture of the dual-light zoom lens is realized through the definition of the outer diameters of the two groups of the front group, which is favorable for adjusting the inner light path of the dual-light zoom lens and also favorable for realizing the miniaturization of the dual-light zoom lens.
One of the objects of the present invention is also to provide an image forming apparatus, comprising: a dual-light zoom lens; and an imaging element configured to receive an image formed by the binary zoom lens.
Compared with the prior art, the dual-light zoom lens and the imaging device provided by the invention have the following advantages that
The beneficial effects are that:
1. through the quantity of the movable groups in the zoom lens is greatly increased, the movement distance of the front group is increased to a certain extent, and through the quantity of the cemented lenses in the second zoom lens group after the diaphragm is increased, the aberration and coma of the zoom lens are greatly reduced, the double-light zoom lens is miniaturized, larger multiplying power can be realized, and the application range of the double-light zoom lens is increased.
2. By limiting the focal length of the adjusting lens group, the possibility of abnormality when light rays are emitted from the adjusting lens group is reduced, the correction of the image quality of the object plane side group of the adjusting lens group is realized, and the imaging quality of the double-light zoom lens is increased
3. The definition of the aperture of the dual-light zoom lens is realized by the definition of the outer diameters of the two groups of the front group, which is beneficial to the adjustment of the inner light path of the dual-light zoom lens and the miniaturization of the dual-light zoom lens.
Drawings
The above features, technical features, advantages and implementation of a dual-light zoom lens and an imaging apparatus will be further described in detail below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a dual-light zoom lens according to the present invention;
FIG. 2 is a coma view of a wide-angle state of a dual-light zoom lens according to the present invention;
FIG. 3 is an aberration diagram of a wide-angle state of a dual-beam zoom lens according to the present invention;
FIG. 4 is a coma view of a telescopic state of a dual-light zoom lens according to the present invention;
FIG. 5 is an aberration diagram of a telephoto state of the dual-beam zoom lens of the present invention;
FIG. 6 is a schematic diagram of another dual-light zoom lens according to the present invention;
FIG. 7 is a coma view of a wide-angle state of another dual-light zoom lens of the present invention;
FIG. 8 is an aberration diagram of another wide-angle state of a dual-beam zoom lens according to the present invention;
FIG. 9 is a coma view of a telescopic state of another dual-beam zoom lens according to the present invention;
fig. 10 is an aberration diagram of a telescopic state of another binary zoom lens according to the present invention.
Reference numerals illustrate: g1, fixing a lens group; g2, a first variable magnification lens group; g3, a second variable magnification lens group; g4, focusing lens group; g5, adjusting the lens group; g6, a beam-splitting prism; g7, an auxiliary component; a1, a first fixed lens; a2, a second fixed lens; a3, a third fixed lens; a4, a fourth fixed lens; b1, a first zoom lens; b2, a second variable magnification lens; b3, a third zoom lens; b4, a fourth variable magnification lens; b5, a fifth zoom lens; b6, a sixth variable magnification lens; b7, a seventh zoom lens; b8, an eighth variable magnification lens; b9, a ninth variable magnification lens; c1, focusing lens; d1, a first adjusting lens; d2, a second adjusting lens; d3, a third adjusting lens; d4, a fourth adjusting lens; STO and diaphragm; CG. And (3) protecting glass.
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, a binary zoom lens is composed of a fixed lens group G1 with positive power, a first variable lens group G2 with negative power, a second variable lens group G3 with positive power, a focusing lens group G4 with negative power, an adjusting lens group G5 with positive power and a beam splitter prism G6 in order from an object plane side to an image plane side;
the first zoom lens group G2, the second zoom lens group G3, the focusing lens group G4 and the adjusting lens group G5 move along the main optical axis direction of the double-light zoom lens;
the second variable magnification lens group G3 consists of a fifth variable magnification lens b5 with positive focal power, a sixth variable magnification lens b6 with negative focal power, a seventh variable magnification lens b7 with positive focal power, an eighth variable magnification lens b8 with negative focal power and a ninth variable magnification lens b9 with positive focal power, wherein the sixth variable magnification lens b6 is glued with the seventh variable magnification lens b7, and the eighth variable magnification lens b8 is glued with the ninth variable magnification lens b 9;
the dual-light zoom lens satisfies the following conditional expression:
ft/fw＞20；
XG2+DG2＞DG36；
wherein ft is a focal length of the telescopic state of the binary zoom lens, fw is a focal length of the wide-angle state of the binary zoom lens, XG2 is a moving distance of the first variable magnification lens group G2, DG2 is an optical total length of the first variable magnification lens group G2, and DG36 is an optical total length of the second variable magnification lens group G3 to the beam splitter prism G6.
In this embodiment, by greatly increasing the number of moving groups in the zoom lens and increasing the moving distance of the front group to a certain extent, and by increasing the number of cemented lenses in the second zoom lens group G3 after the stop STO, the aberration and coma of the zoom lens are greatly reduced, so that the dual-light zoom lens can be miniaturized, and a larger magnification can be realized, and the application range of the dual-light zoom lens is increased.
The second variable magnification lens group G3 and the adjusting lens group G5 each have one aspherical lens and only one aspherical lens.
By setting a small number of aspheric lenses in the rear group, the double-light zoom lens is greatly reduced, the number of lenses is also reduced, and the miniaturization of the double-light zoom lens is realized.
The first variable power lens group G2 is composed of a first variable power lens b1 with negative focal power, a second variable power lens b2 with negative focal power, a third variable power lens b3 with positive focal power and a fourth variable power lens b4 with negative focal power.
The fixed lens group G1 is composed of a first fixed lens a1 with negative focal power, a second fixed lens a2 with positive focal power, a third fixed lens a3 with positive focal power and a fourth fixed lens a4 with positive focal power, wherein the first fixed lens a1 and the second fixed lens a2 are glued.
The focusing lens group G4 is a focusing lens c1 with negative focal power.
The adjusting lens group G5 is composed of a first adjusting lens d1 with negative focal power, a second adjusting lens d2 with positive focal power, a third adjusting lens d3 with positive focal power, and a fourth adjusting lens d4 with positive focal power, and the first adjusting lens d1 and the second adjusting lens d2 are glued together.
The adjustment lens group G5 is a fourth adjustment lens d4 having positive power.
The fourth adjustment lens d4 satisfies the following conditional expression:
4＜fd4/fw＜5；
wherein fd4 is the focal length of the fourth adjusting lens d4.
The definition of the focal length of the fourth adjusting lens d4 realizes the correction of the image quality of the object plane side group of the adjusting lens group G5, and the imaging quality of the double-light zoom lens is improved.
The adjustment lens group G5 satisfies the following conditional expression:
3.5＜fG5/fw＜4.5；
wherein fG5 is the focal length of the adjusting lens group G5.
By limiting the focal length of the adjusting lens group G5, the possibility of abnormality when light rays exit from the adjusting lens group G5 is reduced, the correction of the image quality of the object plane side group of the adjusting lens group G5 is realized, and the imaging quality of the dual-light zoom lens is increased
The dual-light zoom lens satisfies the following conditional expression:
0.8＜XG2/DG36＜1.2。
by limiting the parameters, the moving distance of the first variable magnification lens group G2 is increased, the optical total length of the first variable magnification lens group G2 is reduced, meanwhile, the combined diaphragm STO can move along with the second variable magnification lens group, the optical total length of the dual-light zoom lens is further reduced, and the miniaturization of the dual-light zoom lens is realized.
The dual-light zoom lens satisfies the following conditional expression:
0.25＜XG2/TTL＜0.3；
and TTL is the total optical length of the dual-light zoom lens.
By limiting the parameters, the limitation of the moving distance of the first variable magnification lens group G2 is further realized, the possibility that the moving distance of the first variable magnification lens group G2 is overlarge is reduced, and the miniaturization of the double-light zoom lens is realized.
The dual-light zoom lens satisfies the following conditional expression:
1.9＜ΦG1/ΦG2＜2；
Φg1 is the outer diameter of the fixed lens group G1, Φg2 is the outer diameter of the first variable magnification lens group G2.
The definition of the aperture of the dual-light zoom lens is realized by the definition of the outer diameters of the two groups of the front group, which is beneficial to the adjustment of the inner light path of the dual-light zoom lens and the miniaturization of the dual-light zoom lens.
Example 2
As shown in fig. 1 to 5, a binary zoom lens is composed of, in order from an object plane side to an image plane side, a fixed lens group G1 of positive power, a first variable lens group G2 of negative power, a stop STO, a second variable lens group G3 of positive power, a focusing lens group G4 of negative power, an adjusting lens group G5 of positive power, a dichroic prism G6, and an auxiliary component G7;
the first zoom lens group G2, the second zoom lens group G3, the focusing lens group G4 and the adjusting lens group G5 move along the main optical axis direction of the double-light zoom lens;
the first variable power lens group G2 is composed of a first variable power lens b1 with negative focal power, a second variable power lens b2 with negative focal power, a third variable power lens b3 with positive focal power and a fourth variable power lens b4 with negative focal power.
The second variable magnification lens group G3 consists of a fifth variable magnification lens b5 with positive focal power, a sixth variable magnification lens b6 with negative focal power, a seventh variable magnification lens b7 with positive focal power, an eighth variable magnification lens b8 with negative focal power and a ninth variable magnification lens b9 with positive focal power, wherein the sixth variable magnification lens b6 is glued with the seventh variable magnification lens b7, and the eighth variable magnification lens b8 is glued with the ninth variable magnification lens b 9;
the focusing lens group G4 is a focusing lens c1 with negative focal power.
The adjusting lens group G5 is composed of a first adjusting lens d1 with negative focal power, a second adjusting lens d2 with positive focal power, a third adjusting lens d3 with positive focal power, and a fourth adjusting lens d4 with positive focal power, and the first adjusting lens d1 and the second adjusting lens d2 are glued together.
The auxiliary component G7 is a piece of cover glass CG.
The basic lens data of the binary zoom lens of the present embodiment is shown in table 1, the variable parameters in table 1 are shown in table 2, and the aspherical coefficients are shown in table 3.
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 2, the WIDE column indicates specific values of the respective variable parameters when the binary zoom lens is in the WIDE-angle end state, and the TELE column indicates specific values of the respective variable parameters when the binary zoom lens is in the telephoto end state.
In Table 3, K is the conic coefficient, e is the scientific count number, e.g., e-005 indicates 10 -5 。
[ Table 1 ]
[ Table 2 ]
[ Table 3 ]
In this example, ft=226 mm, fw=10.45 mm, ft/fw=21.63, fno=1.66-4.54, ttl=170 mm;
wherein ft is a focal length of the binary zoom lens in a telescopic state, fw is a focal length of the binary zoom lens in a wide-angle state, fno is an f-number of the binary zoom lens, and TTL is an optical total length of the binary zoom lens.
XG2＝50.29mm，DG2＝15.02mm，XG2+DG2＝65.31mm，DG36＝50.14mm；
XG2/DG36＝1.003；
XG2/TTL＝0.296；
XG2 is a movement distance of the first variable magnification lens group G2, DG2 is an optical total length of the first variable magnification lens group G2, and DG36 is an optical total length of the second variable magnification lens group G3 to the beam splitter prism G6.
fd4＝45.95mm，fd4/fw＝4.4；
fG5＝41.56mm，fG5/fw＝3.98；
Wherein fd4 is the focal length of the fourth adjusting lens d4, and fG5 is the focal length of the adjusting lens group G5.
ΦG1＝60.1mm，ΦG2＝30.5mm；
ΦG1/ΦG2＝1.97；
Φg1 is the outer diameter of the fixed lens group G1, Φg2 is the outer diameter of the first variable magnification lens group G2.
Example 3
As shown in fig. 6 to 10, a binary zoom lens is composed of, in order from an object plane side to an image plane side, a fixed lens group G1 of positive power, a first variable lens group G2 of negative power, a stop STO, a second variable lens group G3 of positive power, a focusing lens group G4 of negative power, an adjusting lens group G5 of positive power, and a dichroic prism G6;
the first zoom lens group G2, the second zoom lens group G3, the focusing lens group G4 and the adjusting lens group G5 move along the main optical axis direction of the double-light zoom lens;
the first variable power lens group G2 is composed of a first variable power lens b1 with negative focal power, a second variable power lens b2 with negative focal power, a third variable power lens b3 with positive focal power and a fourth variable power lens b4 with negative focal power.
The second variable magnification lens group G3 consists of a fifth variable magnification lens b5 with positive focal power, a sixth variable magnification lens b6 with negative focal power, a seventh variable magnification lens b7 with positive focal power, an eighth variable magnification lens b8 with negative focal power and a ninth variable magnification lens b9 with positive focal power, wherein the sixth variable magnification lens b6 is glued with the seventh variable magnification lens b7, and the eighth variable magnification lens b8 is glued with the ninth variable magnification lens b 9;
the focusing lens group G4 is a focusing lens c1 with negative focal power.
The adjustment lens group G5 is a fourth adjustment lens d4 having positive power.
The basic lens data of the binary zoom lens of the present embodiment are shown in table 4, the variable parameters in table 4 are shown in table 5, and the aspherical coefficients are shown in table 6.
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 5, the WIDE column indicates specific values of the respective variable parameters when the binary zoom lens is in the WIDE-angle end state, and the TELE column indicates specific values of the respective variable parameters when the binary zoom lens is in the telephoto end state.
In Table 6, K is the conic coefficient, e is the scientific count number, e.g., e-005 indicates 10 -5 。
[ Table 4 ]
[ Table 5 ]
| WIDE | TELE | |
| D1 | 1 | 47.9 |
| D2 | 66.01 | 1.68 |
| D3 | 1 | 2.73 |
| D4 | 7.18 | 27.7 |
| D5 | 6.02 | 1.2 |
[ Table 6 ]
In this example, ft=220 mm, fw=11 mm, ft/fw=20, fno=1.64-4.03, ttl=170 mm;
wherein ft is a focal length of the binary zoom lens in a telescopic state, fw is a focal length of the binary zoom lens in a wide-angle state, fno is an f-number of the binary zoom lens, and TTL is an optical total length of the binary zoom lens.
XG2＝46.9mm，DG2＝15.61mm，XG2+DG2＝62.51mm，DG36＝51.8mm；
XG2/DG36＝0.9；
XG2/TTL＝0.276；
XG2 is a movement distance of the first variable magnification lens group G2, DG2 is an optical total length of the first variable magnification lens group G2, and DG36 is an optical total length of the second variable magnification lens group G3 to the beam splitter prism G6.
fG5＝fd4＝46.48mm，fG5/fw＝fd4/fw＝4.23；
Wherein fd4 is the focal length of the fourth adjusting lens d4, and fG5 is the focal length of the adjusting lens group G5.
ΦG1＝63.22mm，ΦG2＝32.23mm；
ΦG1/ΦG2＝1.96；
Φg1 is the outer diameter of the fixed lens group G1, Φg2 is the outer diameter of the first variable magnification lens group G2.
Example 4
An image forming apparatus, as shown in fig. 1 to 10, includes: the binary zoom lens described in any one of the embodiments above, and an imaging element configured to receive an image formed by the binary zoom lens.
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 (13)
1. The double-light zoom lens is characterized by comprising a fixed lens group with positive focal power, a first variable lens group with negative focal power, a diaphragm, a second variable lens group with positive focal power, a focusing lens group with negative focal power, an adjusting lens group with positive focal power and a beam splitter prism in sequence from an object plane side to an image plane side;
the first zoom lens group, the second zoom lens group, the focusing lens group and the adjusting lens group move along the main optical axis direction of the double-light zoom lens;
the second variable magnification lens group consists of a fifth variable magnification lens with positive focal power, a sixth variable magnification lens with negative focal power, a seventh variable magnification lens with positive focal power, an eighth variable magnification lens with negative focal power and a ninth variable magnification lens with positive focal power, wherein the sixth variable magnification lens is glued with the seventh variable magnification lens, and the eighth variable magnification lens is glued with the ninth variable magnification lens;
the dual-light zoom lens satisfies the following conditional expression:
ft/fw＞20；
XG2+DG2＞DG36；
wherein ft is a focal length of the telescopic state of the binary zoom lens, fw is a focal length of the wide-angle state of the binary zoom lens, XG2 is a moving distance of the first variable magnification lens group, DG2 is an optical total length of the first variable magnification lens group, and DG36 is an optical total length from the second variable magnification lens group to the beam splitter prism.
2. The dual-optical zoom lens according to claim 1, wherein:
the second zoom lens group and the adjusting lens group are provided with one aspheric lens.
3. The dual-optical zoom lens according to claim 1, wherein:
the first variable magnification lens group consists of a first variable magnification lens with negative focal power, a second variable magnification lens with negative focal power, a third variable magnification lens with positive focal power and a fourth variable magnification lens with negative focal power.
4. The dual-optical zoom lens according to claim 1, wherein:
the fixed lens group consists of a first fixed lens with negative focal power, a second fixed lens with positive focal power, a third fixed lens with positive focal power and a fourth fixed lens with positive focal power, and the first fixed lens and the second fixed lens are glued.
5. The dual-optical zoom lens according to claim 1, wherein:
the focusing lens group is a focusing lens with negative focal power.
6. A binary zoom lens according to any one of claim 1, wherein:
the adjusting lens group consists of a first adjusting lens with negative focal power, a second adjusting lens with positive focal power, a third adjusting lens with positive focal power and a fourth adjusting lens with positive focal power, and the first adjusting lens and the second adjusting lens are glued.
7. A binary zoom lens according to any one of claim 1, wherein:
the adjusting lens group is a fourth adjusting lens with positive focal power.
8. A binary zoom lens according to claim 6 or 7, wherein:
the fourth adjustment lens satisfies the following conditional expression:
4＜fd4/fw＜5；
wherein fd4 is the focal length of the fourth adjustment lens.
9. The dual-optical zoom lens according to claim 6, wherein:
the adjusting lens group satisfies the following conditional expression:
3.5＜fG5/fw＜4.5；
wherein fG5 is the focal length of the adjusting lens group.
10. The dual-optical zoom lens according to claim 1, wherein:
the dual-light zoom lens satisfies the following conditional expression:
0.8＜XG2/DG36＜1.2。
11. the dual-optical zoom lens according to claim 1, wherein:
the dual-light zoom lens satisfies the following conditional expression:
0.25＜XG2/TTL＜0.3；
and TTL is the total optical length of the dual-light zoom lens.
12. The dual-optical zoom lens according to claim 1, wherein:
the dual-light zoom lens satisfies the following conditional expression:
1.9＜ΦG1/ΦG2＜2；
Φg1 is the outer diameter of the fixed lens group, Φg2 is the outer diameter of the first variable magnification lens group.
13. An image forming apparatus, comprising:
the dual-light zoom lens according to any one of claims 1 to 12;
and an imaging element configured to receive an image formed by the binary zoom lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310629687.4A CN116841023A (en) | 2023-05-31 | 2023-05-31 | Dual-light zoom lens and imaging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310629687.4A CN116841023A (en) | 2023-05-31 | 2023-05-31 | Dual-light zoom lens and imaging device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116841023A true CN116841023A (en) | 2023-10-03 |
Family
ID=88169590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310629687.4A Pending CN116841023A (en) | 2023-05-31 | 2023-05-31 | Dual-light zoom lens and imaging device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116841023A (en) |
-
2023
- 2023-05-31 CN CN202310629687.4A patent/CN116841023A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108398773B (en) | Zoom lens and image pickup apparatus having the same | |
| US9739976B2 (en) | Imaging lens and imaging apparatus | |
| CN106814443B (en) | Zoom lens and image pickup apparatus | |
| US8625203B2 (en) | Zoom lens, optical apparatus having same, and method of manufacturing zoom lens | |
| JP2008225314A (en) | Zoom lens | |
| JP5767335B2 (en) | Zoom lens and imaging device | |
| JP6291408B2 (en) | Zoom lens and imaging device | |
| EP2933672A1 (en) | Imaging optics | |
| JP2015141384A (en) | Imaging lens and imaging device | |
| CN110389430B (en) | Zoom lens and image pickup apparatus including the same | |
| CN113589505B (en) | Zoom lens and imaging device | |
| CN113296251B (en) | Zoom lens and imaging device | |
| JPWO2013031180A1 (en) | Zoom lens and imaging device | |
| CN113296250B (en) | Zoom lens and imaging device | |
| CN106990514B (en) | Zoom lens and image pickup apparatus including the same | |
| JP5767330B2 (en) | Zoom lens and imaging device | |
| JP2012511735A (en) | Miniaturized vario lens | |
| JP4817551B2 (en) | Zoom lens | |
| CN114815192A (en) | Zoom lens and imaging device | |
| CN116841023A (en) | Dual-light zoom lens and imaging device | |
| JP5767710B2 (en) | Zoom lens and imaging device | |
| WO2013031185A1 (en) | Zoom lens and imaging device | |
| CN113885184B (en) | Long-focus zoom lens and image pickup device | |
| JPWO2013031182A1 (en) | Zoom lens and imaging device | |
| JPWO2013031179A1 (en) | Zoom lens and imaging device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |