CN115616748B - Manual zoom lens with high definition and large image plane - Google Patents
Manual zoom lens with high definition and large image plane Download PDFInfo
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- CN115616748B CN115616748B CN202211146657.XA CN202211146657A CN115616748B CN 115616748 B CN115616748 B CN 115616748B CN 202211146657 A CN202211146657 A CN 202211146657A CN 115616748 B CN115616748 B CN 115616748B
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- 230000005499 meniscus Effects 0.000 claims abstract description 73
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- 239000005308 flint glass Substances 0.000 description 10
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- 229910052746 lanthanum Inorganic materials 0.000 description 6
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- 125000005647 linker group Chemical group 0.000 description 6
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
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- 229910052698 phosphorus Inorganic materials 0.000 description 2
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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
- G02B15/14—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
- G02B15/143105—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 +-+
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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
- G02B15/163—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
- G02B15/173—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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/025—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using glue
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Lenses (AREA)
Abstract
The invention relates to a high-definition large-image-surface manual zoom lens, wherein an optical system of the lens consists of a fixed group A of positive focal power, a zoom group B of negative focal power, an iris C, a compensation group D of positive focal power and a plane filter which are sequentially arranged along an incident light path; the fixed group A consists of a meniscus negative lens A1, a meniscus positive lens A2 and a meniscus positive lens A3 which are sequentially arranged; the variable magnification group B consists of a meniscus negative lens B1, a biconcave negative lens B2, a meniscus negative lens B3 and a meniscus positive lens B4 which are sequentially arranged; the compensation group D consists of a biconvex positive lens D1, a biconcave negative lens D2, a biconvex positive lens D3, a biconvex positive lens D4, a biconcave negative lens D5, a biconvex positive lens D6, a meniscus negative lens D7 and a biconvex positive lens D8 which are sequentially arranged. The adoption of the simplified three-group zooming mode is beneficial to controlling the volume of the lens, and the assembly sensitivity of the lens is reduced and the anti-interference performance of the lens is enhanced through controlling the aberration progression of the lens and the incidence angle of light rays.
Description
Technical Field
The invention relates to the field of optical lenses, in particular to a manual zoom lens with high definition and large image surface.
Background
With the rising and development of the machine vision industry, the used scenes of the machine vision lens are gradually increased, the excellent machine vision system can greatly improve the detection and identification efficiency under the application scenes of precise detection, intelligent identification, logistics code scanning and defect detection, and provide a great deal of convenience for automatic production detection.
Although the zoom lens can realize different multiplying power detection requirements of fixed machine position, the traditional automatic zoom lens can not adapt to the ultra-wide object distance range high-definition detection requirement of machine vision detection by means of the micro-compensation mechanism of the front fixed group under a small range of object distances, and the fixed focus lenses with different focal lengths have to be selected for detection and identification in order to meet the use requirements.
Disclosure of Invention
Therefore, the invention aims to provide the manual zoom lens with high definition and large image plane, which has small volume, adopts a simplified zoom compensation structure form, and realizes flexible adjustment of multiple focal lengths and wide object distance range through manual accurate control of a zoom group and a compensation group.
The invention is realized by adopting the following scheme: the optical system of the lens consists of a fixed group A with positive focal power, a variable group B with negative focal power, an iris C, a compensating group D with positive focal power and a plane filter which are sequentially arranged along an incident light path; the fixed group A consists of a meniscus negative lens A1, a meniscus positive lens A2 and a meniscus positive lens A3 which are sequentially arranged; the variable magnification group B consists of a meniscus negative lens B1, a biconcave negative lens B2, a meniscus negative lens B3 and a meniscus positive lens B4 which are sequentially arranged; the compensation group D consists of a biconvex positive lens D1, a biconcave negative lens D2, a biconvex positive lens D3, a biconvex positive lens D4, a biconcave negative lens D5, a biconvex positive lens D6, a meniscus negative lens D7 and a biconvex positive lens D8 which are sequentially arranged.
Further, the negative meniscus lens A1 and the positive meniscus lens A2 in the fixed group A are glued and closely connected to form a first gluing group; the meniscus negative lens B1 and the biconcave negative lens B2 in the variable-magnification group B are glued and closely connected to form a second gluing group; the biconcave negative lens D2 and the biconvex positive lens D3 in the compensation group D are glued and closely connected to form a third gluing group, the biconvex positive lens D4 and the biconcave negative lens D5 are glued and closely connected to form a fourth gluing group, and the biconvex positive lens D6 and the meniscus negative lens D7 are glued and closely connected to form a fifth gluing group.
Further, the focal length F of the first bonding group in the fixed group A 1 And focal length F of fixed group A A The relation is satisfied: f is more than 2.1 1 /F A < 2.4; the variable-magnification groupFocal length F of the second glue group in B 2 And focal length F of zoom group B B Satisfies the relation-2.6 < F 2 /F B -2.3; focal length F of the third glue group in the compensation group D 3 Focal length F of fourth glue group 4 Focal length F of fifth adhesive set 5 And focal length F of compensation group D D Satisfy the relation of 2.7 < F 3 /F D ＜3.1，-1.5＜F 4 /F D ＜-1.2，3.2＜F 5 /F D ＜3.5。
Further, the air distance moving range from the fixed group A to the variable-magnification group B is 1.0mm-18.83mm; the air distance moving range from the zoom group B to the iris diaphragm C is 2.10mm-19.93mm; the air distance moving range from the iris diaphragm C to the compensation group D is 1.76mm-8.84mm; the air distance moving range from the compensation group D to the flat filter is 12.32mm-19.40mm.
Further, the air interval from the positive meniscus lens A2 to the positive meniscus lens A3 in the fixed group A is 0.1mm; the air space between the meniscus negative lens B1 and the biconcave negative lens B2 in the variable power group B is 5.35mm, and the air space between the biconcave negative lens B2 and the meniscus negative lens B3 is 0.88mm.
Further, in the compensation group D, the air space from the biconvex positive lens D1 to the biconcave negative lens D2 is 1.74mm, the air space from the biconvex positive lens D3 to the biconvex positive lens D4 is 0.1mm, the air space from the biconcave negative lens D5 to the biconvex positive lens D6 is 1.17mm, the air space from the meniscus negative lens D7 to the biconvex positive lens D8 is 5.44mm, and the air space from the flat filter to the image surface is 0.1mm.
Compared with the prior art, the invention has the following beneficial effects:
(1) The simplified three-group zooming mode is adopted to control the volume of the lens, and the aberration progression and the light incidence angle of the lens are controlled, so that the assembly sensitivity of the lens is reduced, and the anti-interference performance of the lens is enhanced; by introducing the object distance adjusting function of the compensation group, the object distance using range is greatly widened, so that the lens can perform high-resolution imaging under multi-view multiplying power detection and multi-object distance scene of a fixed machine position, frequent lens replacement is not needed, and the lens has wider application scene.
(2) The compensating group reduces the incidence angle of the incident light of the large image surface on the lens through the three groups of cemented lens groups to the greatest extent, not only reduces the assembly sensitivity among the multiple lenses of the compensating group, but also controls the off-axis aberration of the large image surface lens, and the two positive focal power high Abbe number materials and the negative focal power lens with high refractive index are introduced for cementing, so that the secondary spectrum of the system can be reduced sufficiently, and the lens can still maintain high-resolution imaging under the high aberration level brought by the large image surface.
The present invention will be further described in detail below with reference to specific embodiments and associated drawings for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.
Drawings
FIG. 1 is a schematic view of a short focal path according to an embodiment of the present invention;
FIG. 2 is a schematic view of a sub-focus optical path according to an embodiment of the present invention;
FIG. 3 is a schematic view of a tele path according to an embodiment of the present invention;
fig. 4 is a short focal Spot column diagram according to an embodiment of the present invention;
fig. 5 is a sub-long focus Spot column diagram according to an embodiment of the present invention;
fig. 6 is a column diagram of a long focus Spot point according to an embodiment of the present invention;
FIG. 7 is a short focal 300mm object distance MTF transfer function diagram of an embodiment of the present invention;
FIG. 8 is a short focal length 500mm object distance MTF transfer function diagram of an embodiment of the present invention;
FIG. 9 is a graph of a short focal length infinity object distance MTF transfer function in accordance with an embodiment of the present invention;
FIG. 10 is a graph of the secondary focal length 300mm object distance MTF transfer function of an embodiment of the present invention;
FIG. 11 is a graph of the secondary focal length 500mm object distance MTF transfer function of an embodiment of the present invention;
FIG. 12 is a graph of the transmission function of the second longest Jiao Moqiong object distance MTF according to an embodiment of the present invention;
FIG. 13 is a graph of the long focal length 300mm object distance MTF transfer function of an embodiment of the present invention;
FIG. 14 is a long focal length 500mm object distance MTF transfer function diagram of an embodiment of the present invention;
fig. 15 is a long Jiao Moqiong long object distance MTF transfer function plot of an embodiment of the invention;
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
As shown in fig. 1-15, an optical system of the high-definition large-image-surface manual zoom lens is composed of a fixed group a with positive focal power, a zoom group B with negative focal power, an iris C, a compensation group D with positive focal power and a plane filter which are sequentially arranged along an incident light path; the fixed group A consists of a meniscus negative lens A1, a meniscus positive lens A2 and a meniscus positive lens A3 which are sequentially arranged; the variable magnification group B consists of a meniscus negative lens B1, a biconcave negative lens B2, a meniscus negative lens B3 and a meniscus positive lens B4 which are sequentially arranged; the compensation group D consists of a biconvex positive lens D1, a biconcave negative lens D2, a biconvex positive lens D3, a biconvex positive lens D4, a biconcave negative lens D5, a biconvex positive lens D6, a meniscus negative lens D7 and a biconvex positive lens D8 which are sequentially arranged.
In the embodiment, the meniscus negative lens A1 and the meniscus positive lens A2 in the fixed group A are glued and closely connected through photosensitive glue to form a first gluing group; the meniscus negative lens B1 and the biconcave negative lens B2 in the zoom group B are glued and closely connected through photosensitive glue to form a second gluing group; the biconcave negative lens D2 and the biconvex positive lens D3 in the compensation group D are tightly adhered through photosensitive glue to form a third gluing group, the biconvex positive lens D4 and the biconcave negative lens D5 are tightly adhered through photosensitive glue to form a fourth gluing group, and the biconvex positive lens D6 and the meniscus negative lens D7 are tightly adhered through photosensitive glue to form a fifth gluing group.
In this embodiment, the optical power of the first glue group is positive; the focal power of the second gluing group is positive; the focal power of the third gluing group is positive; the focal power of the fourth gluing group is a negative value; the optical power of the bonding glue sheet 5 in the compensation group D is positive.
In the embodiment, the bonding surface of the first bonding group is bent to the diaphragm, and the positive-power meniscus lens A2 is bonded with the meniscus negative lens A1 by adopting a high-Abbe material, so that the correction of chromatic aberration of a large aperture is facilitated; the bonding surface of the second bonding group in the zoom group B is bent to the diaphragm; the bonding surface of the third bonding group in the compensation group D faces away from the diaphragm; the bonding surface of the fourth bonding group in the compensation group D is bent to the diaphragm; the bonding surface of the fifth bonding group in the compensation group D is bent towards the diaphragm. And the compensation group D adopts a plurality of groups of cemented lens groups to carry out balance correction of chromatic aberration and spherical aberration, and reduces off-axis aberration.
In this embodiment, the focal length F of the first glue group in the fixed group A 1 And focal length F of fixed group A A The relation is satisfied: f is more than 2.1 1 /F A < 2.4; focal length F of the second gluing group in the zoom group B 2 And focal length F of zoom group B B Satisfies the relation-2.6 < F 2 /F B -2.3; focal length F of the third glue group in the compensation group D 3 Focal length F of fourth glue group 4 Focal length F of fifth adhesive set 5 And focal length F of compensation group D D Satisfy the relation of 2.7 < F 3 /F D ＜3.1，-1.5＜F 4 /F D ＜-1.2，3.2＜F 5 /F D ＜3.5。
In this embodiment, the lenses inside the lens are all formed by combining environment-friendly colorless optical glass, wherein the pin material of the negative meniscus lens A1 is made of heavy flint glass, the pin material of the positive meniscus lens A2 is made of lanthanum crown glass, the pin material of the positive meniscus lens A3 is made of lanthanum crown glass, the pin material of the negative meniscus lens B1 is made of heavy lanthanum flint glass, the pin material of the negative biconcave lens B2 is made of lanthanum crown glass, the pin material of the negative meniscus lens B3 is made of crown flint glass, and the pin material of the positive meniscus lens B4 is made of heavy lanthanum flint glass; the pin material of the biconvex positive lens D1 is made of heavy lanthanum flint glass, the pin material of the biconcave negative lens D2 is made of heavy flint glass, the pin material of the biconvex positive lens D3 is made of heavy flint glass, the pin material of the biconcave positive lens D4 is made of heavy phosphorus crown glass, the pin material of the biconcave negative lens D5 is made of heavy flint glass, the pin material of the biconvex positive lens D6 is made of heavy phosphorus crown glass, the pin material of the meniscus negative lens D7 is made of heavy flint glass, the pin material of the biconvex positive lens D8 is made of heavy flint glass, and the surfaces of the lenses are plated with high-transmittance films so as to increase the transmittance and weaken stray light.
In this embodiment, the fixed group a formed by the negative meniscus lens A1, the positive meniscus lens A2, and the positive meniscus lens A3 is kept in a fixed state with respect to the image plane during the use of the lens; the zoom group B formed by the meniscus negative lens B1, the biconcave negative lens B2, the meniscus negative lens B3 and the meniscus positive lens B4 keeps a moving state relative to an image surface in the using process of the lens so as to realize the function of changing the focal length of the lens, and the moving track of the zoom group B moves left and right along the optical axis direction; the iris diaphragm C keeps a fixed state relative to an image plane in the using process of the lens; the compensation group D formed by the biconvex positive lens D1, the biconcave negative lens D2, the biconvex positive lens D3, the biconcave positive lens D4, the biconcave negative lens D5, the biconvex positive lens D6, the meniscus negative lens D7 and the biconvex positive lens D8 keeps a motion state relative to an image plane in the using process of the lens so as to realize the focusing compensation function of different focal lengths, and meanwhile, different object distances can be focused accurately, and the motion trail of the compensation group D moves left and right along the optical axis direction.
In the embodiment, a metal space ring is adopted between the first gluing group and the meniscus positive lens A3 for indirect bearing; the edge of the lens is adopted to directly bear between the meniscus negative lens B1 and the biconcave negative lens B2 in the zoom group B; and the edge of the lens is directly supported between the biconcave negative lens B2 in the variable-magnification group B and the second gluing group.
In the embodiment, a metal space ring is adopted between the biconvex positive lens D1 in the compensation group D and the third gluing group for indirect bearing; the third gluing group and the fourth gluing group are indirectly supported by adopting a metal spacing ring; the fourth gluing group and the fifth gluing group are directly supported by adopting the edges of the lenses; and a metal space ring is adopted between the fifth gluing group and the biconvex positive lens D8 for direct bearing.
In the embodiment, the air distance moving range from the fixed group A to the variable-magnification group B is 1.0mm-18.83mm; the air distance moving range from the zoom group B to the iris diaphragm C is 2.10mm-19.93mm; the air distance moving range from the iris diaphragm C to the compensation group D is 1.76mm-8.84mm; the air distance moving range from the compensation group D to the flat filter is 12.32mm-19.40mm.
In the present embodiment, the air interval from the meniscus positive lens A2 to the meniscus positive lens A3 in the fixed group a is 0.1mm; the air space between the meniscus negative lens B1 and the biconcave negative lens B2 in the variable power group B is 5.35mm, and the air space between the biconcave negative lens B2 and the meniscus negative lens B3 is 0.88mm.
In this embodiment, the air space from the biconvex positive lens D1 to the biconcave negative lens D2 in the compensation group D is 1.74mm, the air space from the biconvex positive lens D3 to the biconvex positive lens D4 is 0.1mm, the air space from the biconcave negative lens D5 to the biconvex positive lens D6 is 1.17mm, the air space from the meniscus negative lens D7 to the biconvex positive lens D8 is 5.44mm, and the air space from the flat filter to the image plane is 0.1mm.
The manual zoom lens with high definition and large image surface formed by the optical lens group mainly realizes the following optical indexes:
1. focal length: 10.8mm-30mm;
2. relative pore size: d/f' is greater than 1/2.8;
3. object distance range: 300 mm-infinity;
4. the total image height is more than or equal to 14.4mm;
5. the total optical length is less than 98mm;
6. operating temperature: -40-70 ℃.
The manual zoom lens with high definition and large image surface balances the temperature drift curve between the structural component and the lens by controlling the selection of the thermal expansion coefficient and the temperature coefficient of the pin material of the lens, thereby realizing athermal imaging at different temperatures and avoiding refocusing when the lens works at different temperatures.
The lens adopts a three-group type zooming structure to realize manual zoomingAnd a focusing process, wherein the compensation group D with positive focal power can accurately compensate and correct the field curves with different object distances and adjust the on-axis and off-axis aberration under different focal distances, and the focal distance F of the compensation group D with positive focal power D And short focus Duan Jiaoju F of lens W The relation is satisfied: f is more than 1.8 D /F W < 2.1; focal length F of compensation group D of positive optical power D And focal length F of long focal length of lens T The relation is satisfied: f is more than 0.6 D /F T < 0.8; focal length F of the compensation group D D And a biconvex positive lens focal length F in compensation group D D1 The relation is satisfied: f is more than 0.9 and less than D1 /F D < 1.1; focal length F of the compensation group D D And a biconvex positive lens focal length F in compensation group D D8 The relation is satisfied: f is less than 1.6 D8 /F D ＜1.9。
In this embodiment, the surface numbers of the lenses and their parameters are shown in the following table, and the radius of curvature R and the thickness interval unit shown in the following table are all mm, and the surface numbers are sequentially arranged from left to right along the light incident direction shown in fig. 1:
table 1 is a chart of parameters of an optical lens of the high-definition large-image-surface manual zoom lens under short focus, secondary focus and long focus, and fig. 1-3 are schematic diagrams of optical paths of the high-definition large-image-surface manual zoom lens under short focus, secondary focus and long focus. The related parameters of the chart can show that each lens surface type of the high-definition large-image-surface lens is easy to process and control, and the high-definition large-image-surface lens has compact appearance volume and a simplified manual zooming structure form.
Fig. 4-6 show Spot point column diagrams of the high-definition large-image-plane manual zoom lens under short focus, secondary long focus and long focus, and the figure shows that after systematic optimization and balance of aberration of the lens, the radius of a diffuse Spot of the lens is controlled within a small range, so that the lens is free from imaging smear, and the lens has excellent imaging sharpness.
FIGS. 7-9 show the MTF transfer function diagrams of the high-definition large-image-plane manual zoom lens with different object distances under short focal length, and the MTF of the high-definition large-image-plane manual zoom lens with the on-axis and off-axis aberrations being compensated and corrected by the compensation group D is more than 0.7 when on-axis light rays are 80lp/mm and more than 0.3 when off-axis light rays are 80lp/mm when the on-axis object distances are 300 mm; when imaging is carried out at an object distance of 500mm, the MTF of the on-axis light ray is more than 0.7 at the speed of 80lp/mm, and the MTF of the off-axis light ray is more than 0.5 at the speed of 80 lp/mm; when imaging infinite object distance, the MTF of the on-axis light is more than 0.7 at 80lp/mm, and the MTF of the off-axis light is more than 0.2 at 80 lp/mm.
FIGS. 10-12 show graphs of MTF transfer functions of the high-definition large-image-plane manual zoom lens with different object distances under the secondary focus, and the graphs show that after the compensation and correction of on-axis and off-axis aberration by the compensation group D, when the imaging is carried out at the object distance of 300mm, the on-axis light is MTF > 0.75 at 80lp/mm, and the off-axis light is MTF > 0.4 at 80 lp/mm; when imaging is carried out at an object distance of 500mm, the MTF of the on-axis light ray is more than 0.75 at the speed of 80lp/mm, and the MTF of the off-axis light ray is more than 0.6 at the speed of 80 lp/mm; when imaging infinite object distance, the MTF of the on-axis light is more than 0.75 at 80lp/mm, and the MTF of the off-axis light is more than 0.3 at 80 lp/mm.
FIGS. 13-15 show graphs of MTF transfer functions of the high-definition large-image-plane manual zoom lens with different object distances under the long focal length, and the graphs show that after the compensation and correction of on-axis and off-axis aberration by the compensation group D, when the imaging is carried out at the object distance of 300mm, the on-axis light is MTF > 0.75 at 80lp/mm, and the off-axis light is MTF > 0.4 at 80 lp/mm; when imaging is carried out at an object distance of 500mm, the MTF of the on-axis light ray is more than 0.8 at the speed of 80lp/mm, and the MTF of the off-axis light ray is more than 0.55 at the speed of 80 lp/mm; when imaging infinite object distance, the MTF of the on-axis light is more than 0.8 at 80lp/mm, and the MTF of the off-axis light is more than 0.5 at 80 lp/mm.
In summary, the fixed group a, the variable magnification group B and the compensation group D of the lens of the invention correct and balance the complex chromatic aberration of the lens by introducing a plurality of cemented lens groups, and fully reduce the off-axis aberration of the system by optimizing and controlling the light with large field of view, so that the lens can maintain excellent imaging and detection performances in each focal section, each field of view and each object distance section; the lens adopts a simplified three-group zoom structure form to further reduce the volume of the lens, and each component can have excellent anti-interference capability through controlling the aberration progression of each group of lenses, so that the lens has wider application scene.
Any of the above-described embodiments of the present invention disclosed herein, unless otherwise stated, if they disclose a numerical range, then the disclosed numerical range is the preferred numerical range, as will be appreciated by those of skill in the art: the preferred numerical ranges are merely those of the many possible numerical values where technical effects are more pronounced or representative. Since the numerical values are more and cannot be exhausted, only a part of the numerical values are disclosed to illustrate the technical scheme of the invention, and the numerical values listed above should not limit the protection scope of the invention.
If the invention discloses or relates to components or structures fixedly connected with each other, then unless otherwise stated, the fixed connection is understood as: detachably fixed connection (e.g. using bolts or screws) can also be understood as: the non-detachable fixed connection (e.g. riveting, welding), of course, the mutual fixed connection may also be replaced by an integral structure (e.g. integrally formed using a casting process) (except for obviously being unable to use an integral forming process).
In addition, terms used in any of the above-described aspects of the present disclosure to express positional relationship or shape have meanings including a state or shape similar to, similar to or approaching thereto unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components, or can be manufactured by an integral forming process.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the invention in any way, and any person skilled in the art may make modifications or alterations to the disclosed technical content to the equivalent embodiments. However, any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (5)
1. A high definition large image surface manual zoom lens is characterized in that: the optical system of the lens consists of a fixed group A of positive focal power, a variable group B of negative focal power, an iris C, a compensating group D of positive focal power and a plane filter which are sequentially arranged along an incident light path; the fixed group A consists of a meniscus negative lens A1, a meniscus positive lens A2 and a meniscus positive lens A3 which are sequentially arranged; the variable magnification group B consists of a meniscus negative lens B1, a biconcave negative lens B2, a meniscus negative lens B3 and a meniscus positive lens B4 which are sequentially arranged; the compensation group D consists of a biconvex positive lens D1, a biconcave negative lens D2, a biconvex positive lens D3, a biconvex positive lens D4, a biconcave negative lens D5, a biconvex positive lens D6, a meniscus negative lens D7 and a biconvex positive lens D8 which are sequentially arranged; focal length F of the first glue group in the fixed group A 1 And focal length F of fixed group A A The relation is satisfied: f is more than 2.1 1 /F A < 2.4; focal length F of the second gluing group in the zoom group B 2 And focal length F of zoom group B B Satisfies the relation-2.6 < F 2 /F B -2.3; focal length F of the third glue group in the compensation group D 3 Focal length F of fourth glue group 4 Focal length F of fifth adhesive set 5 And focal length F of compensation group D D Satisfy the relation of 2.7 < F 3 /F D ＜3.1，-1.5＜F 4 /F D ＜-1.2，3.2＜F 5 /F D ＜3.5。
2. The high-definition large-image-surface manual zoom lens according to claim 1, wherein: the negative meniscus lens A1 and the positive meniscus lens A2 in the fixed group A are glued and closely connected to form a first gluing group; the meniscus negative lens B1 and the biconcave negative lens B2 in the variable-magnification group B are glued and closely connected to form a second gluing group; the biconcave negative lens D2 and the biconvex positive lens D3 in the compensation group D are glued and closely connected to form a third gluing group, the biconvex positive lens D4 and the biconcave negative lens D5 are glued and closely connected to form a fourth gluing group, and the biconvex positive lens D6 and the meniscus negative lens D7 are glued and closely connected to form a fifth gluing group.
3. The high-definition large-image-surface manual zoom lens according to claim 1, wherein: the air distance moving range from the fixed group A to the variable-magnification group B is 1.0mm-18.83mm; the air distance moving range from the zoom group B to the iris diaphragm C is 2.10mm-19.93mm; the air distance moving range from the iris diaphragm C to the compensation group D is 1.76mm-8.84mm; the air distance moving range from the compensation group D to the flat filter is 12.32mm-19.40mm.
4. A high definition macro image plane manual zoom lens according to claim 1 or 3, wherein: the air interval from the positive meniscus lens A2 to the positive meniscus lens A3 in the fixed group A is 0.1mm; the air space between the meniscus negative lens B1 and the biconcave negative lens B2 in the variable power group B is 5.35mm, and the air space between the biconcave negative lens B2 and the meniscus negative lens B3 is 0.88mm.
5. A high definition macro image plane manual zoom lens according to claim 1 or 3, wherein: the air interval from the biconvex positive lens D1 to the biconcave negative lens D2 in the compensation group D is 1.74mm, the air interval from the biconvex positive lens D3 to the biconvex positive lens D4 is 0.1mm, the air interval from the biconcave negative lens D5 to the biconvex positive lens D6 is 1.17mm, the air interval from the meniscus negative lens D7 to the biconvex positive lens D8 is 5.44mm, and the air interval from the flat filter to the image surface is 0.1mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211146657.XA CN115616748B (en) | 2022-09-21 | 2022-09-21 | Manual zoom lens with high definition and large image plane |
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| CN202211146657.XA CN115616748B (en) | 2022-09-21 | 2022-09-21 | Manual zoom lens with high definition and large image plane |
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| CN115616748A CN115616748A (en) | 2023-01-17 |
| CN115616748B true CN115616748B (en) | 2024-04-05 |
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| JP7118221B1 (en) * | 2021-06-29 | 2022-08-15 | Ｏｍデジタルソリューションズ株式会社 | Zoom lens and imaging device equipped with this zoom lens |
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| JP2006078964A (en) * | 2004-09-13 | 2006-03-23 | Canon Inc | Zoom lens and image pickup device having the same |
| JP2016035538A (en) * | 2014-08-04 | 2016-03-17 | キヤノン株式会社 | Zoom lens and imaging apparatus including the same |
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| CN115616748A (en) | 2023-01-17 |
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