CN116909003A - Zoom optical system - Google Patents
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- CN116909003A CN116909003A CN202310975536.4A CN202310975536A CN116909003A CN 116909003 A CN116909003 A CN 116909003A CN 202310975536 A CN202310975536 A CN 202310975536A CN 116909003 A CN116909003 A CN 116909003A
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- 238000003384 imaging method Methods 0.000 description 10
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- 230000000295 complement effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
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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
- G02B15/146—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
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
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Abstract
The embodiment of the application provides a zoom optical system, which is sequentially provided with a first lens group, a second lens group, a third lens group, a diaphragm, a fourth lens group, a fifth lens group, a sixth lens group and a photosensitive element from an object direction image space; the second lens group and the third lens group are zoom lens groups, the fifth lens group is an anti-shake lens group, the focal length f1 of the first lens group, the focal length f2 of the second lens group, the focal length f3 of the third lens group, the focal length f4 of the fourth lens group, the focal length f5 of the fifth lens group and the focal length f6 of the sixth lens group meet the following conditions: -6.5 is more than or equal to f1/f2 is more than or equal to-8; 4.2 More than or equal to f1/f3 more than or equal to 3.5;2.3 More than or equal to f1/f4 is more than or equal to 1.2; -6.3 is more than or equal to f1/f5 is more than or equal to-5.1; 4.5 More than or equal to f1/f6 is more than or equal to 3.5; the focal length ft when the zoom optical system is at the long focal end and the focal length fw when the zoom optical system is at the short focal end satisfy: ft/fw is more than or equal to 45; the focal length ft of the zoom optical system at the telephoto end and the total optical length TTL of the zoom optical system satisfy: 0.65 And the TTL/ft is more than or equal to 0.6. So that the zoom optical system can be applied to more scenes.
Description
Technical Field
The application relates to the technical field of optical imaging, in particular to a zoom optical system.
Background
The fixed focus lens is a lens with only one fixed focus, and has the advantages of small volume, high focusing speed and stable imaging quality. However, since the fixed focus lens has only one fixed focal length, if the size of the shooting object needs to be adjusted, the adjustment of the distance between the fixed focus lens and the shooting object can be realized, so that the application scene of the fixed focus lens is limited, and shooting cannot be performed in some non-movable scenes.
Disclosure of Invention
An object of an embodiment of the present application is to provide a zoom optical system to improve applicability of the optical system. The specific technical scheme is as follows:
the embodiment of the application provides a zoom optical system, which is sequentially provided with a first lens group, a second lens group, a third lens group, a diaphragm, a fourth lens group, a fifth lens group, a sixth lens group and a photosensitive element from an object direction image side; the second lens group and the third lens group are zoom lens groups, and the fifth lens group is an anti-shake zoom lens group;
the optical power of the first lens group, the third lens group, the fourth lens group and the sixth lens group is positive, and the optical power of the second lens group and the fifth lens group is negative;
the second lens group, the third lens group, the fifth lens group, and the sixth lens group are movable back and forth in an optical axis direction to image visible light at the photosensitive element;
wherein a focal length f1 of the first lens group, a focal length f2 of the second lens group, a focal length f3 of the third lens group, a focal length f4 of the fourth lens group, a focal length f5 of the fifth lens group, and a focal length f6 of the sixth lens group satisfy: -6.5 is more than or equal to f1/f2 is more than or equal to-8; 4.2 More than or equal to f1/f3 more than or equal to 3.5;2.3 More than or equal to f1/f4 is more than or equal to 1.2; -6.3 is more than or equal to f1/f5 is more than or equal to-5.1; 4.5 More than or equal to f1/f6 is more than or equal to 3.5; the focal length ft of the zooming optical system at the long focal end and the focal length fw of the zooming optical system at the short focal end satisfy the following conditions: ft/fw is more than or equal to 45; the focal length ft of the zooming optical system at the long focal end and the total optical length TTL of the zooming optical system meet the following conditions: 0.65 And the TTL/ft is more than or equal to 0.6.
In one possible embodiment, the zoom optical system is zoomed at a short focal end to a long focal end, the second lens group is moved by a distance m1, the third lens group is moved by a distance m2, and the fifth lens group is moved by a distance m2m3, satisfy:
in one possible embodiment, the range of movement of the second lens group is 0 to 50.5 mm when the zoom optical system is at the short focal end to when the zoom optical system is at the long focal end.
In one possible embodiment, the range of movement of the third lens group is 0 to 9 millimeters when the zoom optical system is at the short focal end to when the zoom optical system is at the long focal end.
In one possible embodiment, the range of movement of the fifth lens group is 0 to 8.3 mm when the zoom optical system is at the short focal end to when the zoom optical system is at the long focal end.
In one possible embodiment, the range of movement of the sixth lens group is 0 to 20.5 mm when the zoom optical system is at the short focal end to when the zoom optical system is at the long focal end.
In one possible embodiment, the distance between the diaphragm and the photosensitive element is 71.7 mm when the zoom optical system is at the short focal end to when the zoom optical system is at the long focal end.
In one possible embodiment, the distance between the first lens group and the stop is 116 mm when the zoom optical system is at the short focal end to when the zoom optical system is at the long focal end.
In one possible implementation manner, the first lens group comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged along an image side in an object direction, wherein the first lens is a spherical lens with negative focal power and concave surface facing the image side, the second lens is a meniscus spherical lens with positive focal power and convex surface facing the object side, the third lens and the fourth lens are meniscus spherical lenses with positive focal power and convex surface facing the object side, and the image surface of the first lens and the object surface of the second lens are glued; and/or
The second lens group comprises a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged along an image space in an object direction, wherein the fifth lens and the sixth lens are spherical lenses with negative focal power and concave surfaces facing the image space, the seventh lens is a meniscus spherical lens with positive focal power and convex surfaces facing the object space, and the eighth lens is a biconcave spherical lens with negative focal power; and/or
The third lens group comprises a ninth lens, a tenth lens, an eleventh lens and a twelfth lens which are sequentially arranged along an image space in an object direction, wherein the ninth lens, the tenth lens and the twelfth lens are biconvex spherical lenses with positive focal power, and the eleventh lens is a spherical lens with negative focal power and a concave surface facing the image space; and/or
The fourth lens group comprises a thirteenth lens, the thirteenth lens is a biconvex aspheric lens with positive focal power, and both an object plane and an image plane of the thirteenth lens are aspheric; and/or
The fifth lens group comprises a fourteenth lens and a fifteenth lens which are sequentially arranged along an image space in an object direction, wherein the fourteenth lens is a biconcave spherical lens with negative focal power, the fifteenth lens is a meniscus spherical lens with positive focal power and a concave surface facing the image space, and the image surface of the fourteenth lens is glued with the object surface of the fifteenth lens; and/or
The sixth lens group comprises a sixteenth lens, a seventeenth lens and an eighteenth lens which are sequentially arranged along an image space in an object direction, wherein the sixteenth lens is a spherical lens with negative focal power and a concave surface facing the image space, the seventeenth lens is a biconvex spherical lens with positive focal power, and the eighteenth lens is a biconvex aspheric lens with positive focal power.
In one possible embodiment, the thirteenth lens has an aspherical surface expression:
wherein c is the radius of curvature, y is the radial coordinate, k is the conic coefficient, a 2 、a 4 、a 6 、a 8 、a 10 、a 12 、a 14 、a 16 Is a radial coordinate coefficient.
In one possible embodiment, the zoom optical system further includes a filter located between the sixth lens group and the photosensitive element.
In one possible embodiment, the zoom optical system has a zoom range of 6.7 mm to 300 mm.
The zoom optical system provided by the embodiment of the application adopts a structure that two zoom lens groups and one anti-shake zoom lens group are matched with each other, on one hand, the zoom optical system of the embodiment of the application can realize zooming, improves the applicability of the optical system, and further, the zoom optical system of the embodiment of the application can realize high-magnification zooming, so that the application range of the zoom optical system is wider; on the other hand, the length from the short focal end to the long focal end of the zoom optical system can be reduced, the size of the zoom optical system is further reduced, the anti-shake zoom lens group can move back and forth along the optical axis direction when the environment shakes, and the change of system imaging decline caused by the environment shake is compensated, so that the problem of poor imaging effect caused by the environment shake is solved.
Of course, it is not necessary for any one product or method of practicing the application to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the application, and other embodiments may be obtained according to these drawings to those skilled in the art.
FIG. 1 is a first schematic diagram of a zoom optical system according to an embodiment of the present application;
fig. 2 is a second schematic diagram of a zoom optical system according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application 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 application, but not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by the person skilled in the art based on the present application are included in the scope of protection of the present application.
The zoom lens widely used at present has a larger moving space in front of the zoom lens, so that the overall length of the zoom lens is longer and the volume is larger. In addition, in the existing zoom system, the imaging effect is greatly affected by environmental shake. Therefore, how to make the zoom optical system realize the characteristics of small volume and supporting optical anti-shake while realizing high-magnification zooming becomes a technical problem to be solved.
As shown in fig. 1, an embodiment of the present application provides a zoom optical system provided with a first lens group 1, a second lens group 2, a third lens group 3, a stop 7, a fourth lens group 4, a fifth lens group 5, a sixth lens group 6, and a photosensitive element 9 in order from an object side image side; the second lens group 2 and the third lens group 3 are zoom lens groups, and the fifth lens group 5 is an anti-shake zoom lens group;
the optical powers of the first lens group 1, the third lens group 3, the fourth lens group 4, and the sixth lens group 6 are positive, and the optical powers of the second lens group 2 and the fifth lens group 5 are negative;
the second lens group 2, the third lens group 3, the fifth lens group 5, and the sixth lens group 6 are movable back and forth in the optical axis direction to image visible light on the photosensitive element 9;
wherein, the focal length f1 of the first lens group 1, the focal length f2 of the second lens group 2, the focal length f3 of the third lens group 3, the focal length f4 of the fourth lens group 4, the focal length f5 of the fifth lens group 5, and the focal length f6 of the sixth lens group 6 satisfy: -6.5 is more than or equal to f1/f2 is more than or equal to-8; 4.2 More than or equal to f1/f3 more than or equal to 3.5;2.3 More than or equal to f1/f4 is more than or equal to 1.2; -6.3 is more than or equal to f1/f5 is more than or equal to-5.1; 4.5 More than or equal to f1/f6 is more than or equal to 3.5; the focal length ft when the zoom optical system is at the telephoto end and the focal length fw when the zoom optical system is at the short-focal end satisfy: ft/fw is more than or equal to 45; the focal length ft of the zoom optical system at the telephoto end and the total optical length TTL of the zoom optical system satisfy: 0.65 And the TTL/ft is more than or equal to 0.6.
Wherein the diaphragm 7 is used to control the size of the incident beam.
The object side refers to the side close to the object, and the image side refers to the side close to the image plane. The lens generally has an image plane, which refers to the surface of the lens that is close to the object, and an object plane, which refers to the surface that can be imaged by the lens. The variable magnification lens group refers to a lens group in which magnification can be continuously adjusted within a certain range. The anti-shake lens group is a lens group with magnification which can be continuously adjusted in a certain range and can detect slight shake so as to control lens floating to perform displacement compensation on the shake.
By adopting the embodiment of the application, a structure that two zoom lens groups and one anti-shake zoom lens group are matched with each other is adopted, on one hand, the zoom optical system of the embodiment of the application can realize zooming, improves the applicability of the optical system, and further, the zoom optical system of the embodiment of the application can realize high-magnification zooming, so that the application range of the zoom optical system is wider; on the other hand, the length of the zooming optical system at the long focal length end can be reduced, the volume of the zooming optical system is further reduced, the anti-shake zoom lens group 5 can move along the direction of the vertical optical axis when the environment shakes, and the change of system imaging decline caused by the environment shake is compensated, so that the problem of poor imaging effect caused by the environment shake is solved.
Meanwhile, by adopting the embodiment of the application, the infrared confocal between the short focal length end and the small multiplying power interval can be realized by adjusting the focal length, and the imaging effect under low illumination is improved, so that the definition of an imaging picture can be improved under the condition that the zoom optical system has the visible wavelength band of 430-650 nm and the infrared light of 830-870 nm.
Wherein the short focal end and the long focal end are two states of the zoom optical system. The short focal end is also called a wide-angle end, the angle of view of the variable-focus optical system is wider when the variable-focus optical system is positioned at the short focal end, and the amount of information contained in imaging is large; the long focal end is also called as a telephoto end, the zoom optical system is positioned at the long focal end, the angle of view of the zoom optical system is narrow, a distant object can be pulled up, and the information content in the imaged image is less. The initial state of the zoom optical system is at the short focal end.
In one possible embodiment, each lens group is disposed in a lens barrel with a fixed length, and by adjusting each lens group, each lens group moves along a lens barrel wall in the lens barrel to realize zooming of the optical system, compared with the prior art that each lens group is driven to move by adjusting the length of the lens barrel, the overall length of the zooming optical system is effectively reduced.
In one possible embodiment, the zoom optical system has a zoom range of 6.7 mm-300 mm, achieving a 45-fold zoom; the horizontal photographing angle range is 74.2 ° (short focal length) to 1.7 ° (long focal length), and the photographing range is wide, when the zoom optical system is at the short focal length, the zoom optical system can clearly photograph a picture even if the photographing distance is 1 m, and when the zoom optical system is at the long focal length, the zoom optical system can clearly photograph a picture even if the photographing distance is 1.5 m, so that the zoom optical system in the embodiment of the application can be applied to various environments.
In one possible embodiment, the photosensitive element 9 is 1/1.8 inch in size.
The photosensitive element 9 is divided into a CCD (Charge Coupled Device, a charge coupled device) and a CMOS (Complementary Metal-Oxide Semiconductor) according to the elements, wherein the CCD is a high-end technical element applied to photographic imaging, and the CMOS is applied to products with lower image quality. Taking the example of the photosensitive element 9 using a 1/1.8 inch CCD with a diagonal size of 9.2 mm, the zoom optical system in the embodiment of the present application has a center resolution higher than 250lp/mm (line pair/mm) and a peripheral 0.8H (80% diagonal position) resolution higher than 160lp/mm. This is higher than the conventional lenses with resolutions 720P, 1080P, and 4M.
For convenience of description, the position of the second lens group 2 when the zoom optical system is at the short focal end is denoted as x1, the position of the third lens group 3 is denoted as x2, the position of the fifth lens group 5 is denoted as x3, the position of the second lens group 2 when the zoom optical system is at the long focal end is denoted as y1, the position of the third lens group 3 is denoted as y2, and the position of the fifth lens group 5 is denoted as y3.
The distance by which the second lens group 2 moves is |x1-y1| (hereinafter, denoted as m 1), the distance by which the third lens group 3 moves is |x2-y2| (hereinafter, denoted as m 2), and the distance by which the fifth lens group 5 moves is |x3-y3| (hereinafter, denoted as m 3) in the process of changing the zoom optical system from the short focal end to the long focal end.
In one possible embodiment, the focal lengths of m1, m2, and m3 and the lens group need to satisfy certain constraints, and the following constraints need to be satisfied, by way of example:
in one possible embodiment, the range of movement of the second lens group 2 is 0 to 50.5 mm when the zoom optical system is at the short focal end to when the zoom optical system is at the long focal end; the movement range of the third lens group 3 is 0 to 9 mm; the movement range of the fifth lens group 5 is 0-8.3 mm; the movement range of the sixth lens group 6 is 0-20.5 mm; the distance between the diaphragm 7 and the photosensitive element 9 is 71.7 mm; the distance between the first lens group 1 and the stop 7 is 116 mm.
The moving range of the lens group is 0 to the maximum movable distance, and the maximum movable distance refers to the maximum displacement of the lens group along the optical axis direction image space when the zoom optical system is at the short focal end and the zoom optical system is at the long focal end. Illustratively, when the zoom optical system is currently in an initial state, i.e., in a short focal end, and the zoom optical system is zoomed to an optical system in a long focal end, the second lens group 2 is adjusted to move toward the image side along the optical axis, and the maximum distance of movement of the second lens group 2 is 50.5 mm.
By adopting the embodiment of the application, the second lens group 2, the third lens group 3 and the fifth lens group 5 move back and forth along the optical axis, so that the focal length of the zooming optical system is changed, and the sixth lens group 6 moves back and forth along with the focal length to focus, thereby realizing the characteristics of small volume and high magnification zooming of the zooming optical system, and being applicable to more scenes.
In one possible embodiment, as shown in fig. 2, the first lens group 1 includes a first lens 11, a second lens 12, a third lens 13, and a fourth lens 14 sequentially disposed along an image direction, wherein the first lens 11 is a spherical lens having negative optical power and a concave surface facing the image direction, the second lens 12 is a meniscus spherical lens having positive optical power and a convex surface facing the object direction, the third lens 13 and the fourth lens 14 are meniscus spherical lenses having positive optical power and a convex surface facing the object direction, and an image surface of the first lens and an object surface of the second lens are cemented;
the second lens group 2 includes a fifth lens 21, a sixth lens 22, a seventh lens 23 and an eighth lens 24 sequentially arranged along an image space in an object direction, wherein the fifth lens 21 and the sixth lens 22 are spherical lenses with negative focal power and concave surfaces facing the image space, the seventh lens 23 is a meniscus spherical lens with positive focal power and convex surfaces facing the object space, and the eighth lens 24 is a biconcave spherical lens with negative focal power;
the third lens group 3 includes a ninth lens 31, a tenth lens 32, an eleventh lens 33, and a twelfth lens 34, which are sequentially disposed along an object-side image space, wherein the ninth lens 31, the tenth lens 32, and the twelfth lens 34 are biconvex spherical lenses having positive optical power, and the eleventh lens 33 is a spherical lens having negative optical power and a concave surface facing the image space;
the fourth lens group 4 includes a thirteenth lens 41, the thirteenth lens 41 is a biconvex aspherical lens with positive focal power, and both the object plane and the image plane of the thirteenth lens 41 are aspherical surfaces;
the fifth lens group 5 comprises a fourteenth lens 51 and a fifteenth lens 52 which are sequentially arranged along the image space in the object direction, wherein the fourteenth lens 51 is a biconcave spherical lens with negative focal power, the fifteenth lens 52 is a meniscus spherical lens with positive focal power and concave surface facing the image space, and the image surface of the fourteenth lens 51 is glued with the object surface of the fifteenth lens 52;
the sixth lens group 6 includes a sixteenth lens 61, a seventeenth lens 62, and an eighteenth lens 63, which are sequentially disposed along the object direction in the image direction, wherein the sixteenth lens 61 is a spherical lens having negative optical power and a concave surface facing the image direction, the seventeenth lens 62 is a biconvex spherical lens having positive optical power, and the eighteenth lens 63 is a biconvex aspheric lens having positive optical power.
The aspherical lens is a lens with curvature continuously changing from the center to the edge, the concave lens is a lens with thinner center and negative focal power at the edge, the convex lens is a lens with thicker center and positive focal power at the edge, and the meniscus spherical lens is a lens with thinner edge and both sides protruding towards the same side.
The biconvex lens may be a convex lens with the centers of both surfaces protruding significantly towards the outside of the lens, or may be a convex lens with only the center of one surface protruding significantly towards the outside of the lens and the other surface being relatively flat, for example, the ninth lens 31 in fig. 2 is a biconvex spherical lens with the object surface being relatively flat and the image surface protruding towards the image space; the biconcave lens may be a concave lens with both centers of both surfaces significantly recessed toward the inner side of the lens, or may be a concave lens with only the center of one surface significantly recessed toward the inner side of the lens and the other surface relatively flat, for example, the eighth lens 24 in fig. 2 is a biconcave spherical lens with its object surface relatively flat and the image surface facing the left recess.
The two lenses are glued by gluing them with transparent glue or by fixing them as one piece using existing means.
By adopting the embodiment of the application, sixteen spherical lenses and two aspherical lenses are glued and matched, and each phase difference is corrected by using the aspherical lenses, so that the zoom optical system has good quality at lower cost. In addition, as the fifth lens group 5 is an anti-shake zoom lens group, the anti-shake angle and the anti-shake stroke are increased by gluing the two lenses and enabling the focal power of the fifth lens group 5 to be negative, so that the anti-shake performance is improved, meanwhile, the weight of the anti-shake zoom lens group is lighter, and the service life of the anti-shake zoom lens group is prolonged.
In one embodiment, the anti-shake angle can reach 0.3 ° when the zoom optical system is at the tele end.
In one possible embodiment, as shown in fig. 2, the zoom optical system further includes a filter 8, the filter 8 being located between the sixth lens group 6 and the photosensitive element 9.
The filter 8 serves to eliminate infrared rays and correct incident light. In one possible embodiment, the filter 8 is a quartz filter that uses an adapted physical polarization to maintain the direct portion of the incident light and reflect the oblique portion.
By adopting the embodiment of the application, the light outside the required wave band can be filtered by arranging the optical filter 8 between the sixth lens group 6 and the photosensitive element 9, and the light outside the required wave band is prevented from being interfered.
In one possible embodiment, the aspherical surface expression of the thirteenth lens 41 is:
wherein c is the radius of curvature, y is the radial coordinate, k is the conic coefficient, a 2 、a 4 、a 6 、a 8 、a 10 、a 12 、a 14 、a 16 Is a radial coordinate coefficient. By setting a 2 、a 4 、a 6 The shape and size of the aspheric surface can be accurately set by the constant radial coordinate coefficient.
Wherein the value ranges of k are different, and the surface shapes represented by the expressions are different. Specifically, when k is < -1, the shape of the surface is hyperbolic; when k= -1, the shape of the surface is parabolic; when-1 is less than k and less than 0, the shape of the surface is elliptical; when k=0, the profile curve is circular; when k > 0, the profile curve is oblate.
In a specific embodiment, the zoom optical system adopts a structure as shown in fig. 2, the parameters of each lens are shown in table 1, the aspherical parameters of the thirteenth lens 41 and the eighteenth lens 63 are shown in table 2, the optical parameters of the zoom optical system are shown in table 3, the surface numbers of each of table 1 and table 2 correspond to the surfaces numbered p1, p2, and p3 … … in fig. 2, if the object surfaces of two adjacent lenses are completely bonded to each other, the surface with the smaller number is the image surface, and the surface with the larger number is the object surface, for example, the image surface of the first lens 11 is completely bonded to the object surface of the second lens 12, the p2 with the smaller number is the image surface of the first lens 11, and the p3 with the larger number is the object surface of the second lens 12. In table 1, the thickness refers to the center thickness of the lens.
Table 1 parameters of each lens
Table 2 aspherical parameters
| Face numbering | Radial coordinate coefficient a 4 | Radial coordinate coefficient a 6 | Radial coordinate coefficient a 8 | Radial coordinate coefficient a 10 |
| 24 | -5.16880e-07 | 2.65043e-08 | -2.7102e-10 | 1.6188e-12 |
| 25 | -1.25371e-05 | 7.01809e-09 | 2.4762e-10 | 9.7225e-13 |
| 32 | -1.66140e-05 | -8.35410e-08 | -9.3191e-11 | -2.5240e-12 |
| 33 | -2.119079e-05 | -3.2168973e-08 | -2.5634-11 | -2.3295e-12 |
TABLE 3 optical parameters
| Short focal point | Intermediate end | Long focal end | |
| Focal length f (mm) | 6.7 | 142 | 300 |
| F#(mm) | 1.5 | 3.5 | 5.5 |
| Image height (mm) | 9.2 | 9.2 | 9.2 |
| D(1)(mm) | 1.656 | 50.065 | 52.117 |
| D(2)(mm) | 60.119 | 4.325 | 1.382 |
| D(3)(mm) | 0.856 | 8.24 | 9.134 |
| D(4)(mm) | 0.886 | 15.873 | 26.873 |
| D(5)(mm) | 20.047 | 1.18 | 14.448 |
| D(6)(mm) | 21.438 | 25.438 | 1.05 |
In this embodiment, in order to simplify the calculation, the aspherical expression of the above aspherical lens may be simplified as:
it is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.
Claims (10)
1. A zoom optical system, characterized in that the optical system is provided with a first lens group, a second lens group, a third lens group, a diaphragm, a fourth lens group, a fifth lens group, a sixth lens group and a photosensitive element in order from an object to an image; the second lens group and the third lens group are zoom lens groups, and the fifth lens group is an anti-shake zoom lens group;
the optical power of the first lens group, the third lens group, the fourth lens group and the sixth lens group is positive, and the optical power of the second lens group and the fifth lens group is negative;
the second lens group, the third lens group, the fifth lens group, and the sixth lens group are movable back and forth in an optical axis direction to image visible light at the photosensitive element;
wherein a focal length f1 of the first lens group, a focal length f2 of the second lens group, a focal length f3 of the third lens group, a focal length f4 of the fourth lens group, a focal length f5 of the fifth lens group, and a focal length f6 of the sixth lens group satisfy: -6.5 is more than or equal to f1/f2 is more than or equal to-8; 4.2 More than or equal to f1/f3 more than or equal to 3.5;2.3 More than or equal to f1/f4 is more than or equal to 1.2; -6.3 is more than or equal to f1/f5 is more than or equal to-5.1; 4.5 More than or equal to f1/f6 is more than or equal to 3.5; the focal length ft of the zooming optical system at the long focal end and the focal length fw of the zooming optical system at the short focal end satisfy the following conditions: ft/fw is more than or equal to 45; the focal length ft of the zooming optical system at the long focal end and the total optical length TTL of the zooming optical system meet the following conditions: 0.65 And the TTL/ft is more than or equal to 0.6.
2. The zoom optical system according to claim 1, wherein a moving distance m1 of the second lens group, a moving distance m2 of the third lens group, and a moving distance m3 of the fifth lens group when the zoom optical system is at a short focal end to when the zoom optical system is at a long focal end satisfy:
3. the zoom optical system according to claim 1, wherein the range of movement of the second lens group is 0 to 50.5 mm when the zoom optical system is at a short focal end to when the zoom optical system is at a long focal end.
4. The zoom optical system according to claim 1, wherein a range of movement of the third lens group is 0 to 9 mm when the zoom optical system is at a short focal end to when the zoom optical system is at a long focal end.
5. The zoom optical system according to claim 1, wherein a range of movement of the fifth lens group is 0 to 8.3 mm when the zoom optical system is at a short focal end to when the zoom optical system is at a long focal end.
6. The zoom optical system according to claim 1, wherein a range of movement of the sixth lens group is 0 to 20.5 mm when the zoom optical system is at a short focal end to when the zoom optical system is at a long focal end.
7. The zoom optical system of claim 1, wherein the distance between the stop and the photosensitive element is 71.7 millimeters when the zoom optical system is at a short focal end to when the zoom optical system is at a long focal end.
8. The zoom optical system of claim 1, wherein the distance between the first lens group and the stop is 116 millimeters when the zoom optical system is at a short focal end to when the zoom optical system is at a long focal end.
9. The zoom optical system according to any one of claims 1 to 2, wherein the first lens group includes a first lens, a second lens, a third lens, and a fourth lens which are disposed in order along an object direction image side, wherein the first lens is a spherical lens having negative optical power and concave surface toward the image side, the second lens is a meniscus spherical lens having positive optical power and convex surface toward the object side, the third lens and the fourth lens are meniscus spherical lenses having positive optical power and convex surface toward the object side, and an image surface of the first lens and an object surface of the second lens are cemented; and/or
The second lens group comprises a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged along an image space in an object direction, wherein the fifth lens and the sixth lens are spherical lenses with negative focal power and concave surfaces facing the image space, the seventh lens is a meniscus spherical lens with positive focal power and convex surfaces facing the object space, and the eighth lens is a biconcave spherical lens with negative focal power; and/or
The third lens group comprises a ninth lens, a tenth lens, an eleventh lens and a twelfth lens which are sequentially arranged along an image space in an object direction, wherein the ninth lens, the tenth lens and the twelfth lens are biconvex spherical lenses with positive focal power, and the eleventh lens is a spherical lens with negative focal power and a concave surface facing the image space; and/or
The fourth lens group comprises a thirteenth lens, the thirteenth lens is a biconvex aspheric lens with positive focal power, and both an object plane and an image plane of the thirteenth lens are aspheric; and/or
The fifth lens group comprises a fourteenth lens and a fifteenth lens which are sequentially arranged along an image space in an object direction, wherein the fourteenth lens is a biconcave spherical lens with negative focal power, the fifteenth lens is a meniscus spherical lens with positive focal power and a concave surface facing the image space, and the image surface of the fourteenth lens is glued with the object surface of the fifteenth lens; and/or
The sixth lens group comprises a sixteenth lens, a seventeenth lens and an eighteenth lens which are sequentially arranged along an image space in an object direction, wherein the sixteenth lens is a spherical lens with negative focal power and a concave surface facing the image space, the seventeenth lens is a biconvex spherical lens with positive focal power, and the eighteenth lens is a biconvex aspheric lens with positive focal power.
10. The zoom optical system of claim 9, further comprising a filter between the sixth lens group and the photosensitive element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310975536.4A CN116909003A (en) | 2023-08-03 | 2023-08-03 | Zoom optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310975536.4A CN116909003A (en) | 2023-08-03 | 2023-08-03 | Zoom optical system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116909003A true CN116909003A (en) | 2023-10-20 |
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ID=88358208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310975536.4A Pending CN116909003A (en) | 2023-08-03 | 2023-08-03 | Zoom optical system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116909003A (en) |
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2023
- 2023-08-03 CN CN202310975536.4A patent/CN116909003A/en active Pending
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