CN113885185B - Projection lens - Google Patents
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- CN113885185B CN113885185B CN202111308363.8A CN202111308363A CN113885185B CN 113885185 B CN113885185 B CN 113885185B CN 202111308363 A CN202111308363 A CN 202111308363A CN 113885185 B CN113885185 B CN 113885185B
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- 230000035945 sensitivity Effects 0.000 abstract description 10
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- 230000004075 alteration Effects 0.000 description 6
- 238000012634 optical imaging Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 2
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- 230000002860 competitive effect Effects 0.000 description 1
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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
- G02B15/144—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 four groups only
- G02B15/1445—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 four groups only the first group being negative
- G02B15/144515—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 four groups only the first group being negative arranged -+++
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The invention relates to a projection lens, which sequentially comprises the following components from an object side to an image side along an optical axis: the lens system comprises a first lens group (G1) with negative focal power, a second lens group (G2) with positive focal power, a third lens group (G3) with positive focal power, a diaphragm (STO) and a fourth lens group (G4) with positive focal power. The invention has the advantages of fast response speed of movement among groups of the projection lens, low tolerance sensitivity, high resolution, realization of the wide angle characteristic of the lens, small volume, low cost and high lens assembly yield.
Description
Technical Field
The present disclosure relates to optical imaging systems, and particularly to a projection lens.
Background
The development trend of projection lenses is low cost, high resolution and wide angle. In the highly competitive market, in order to achieve the purposes of reducing the cost, volume and weight of the lens, and simultaneously enabling the projection lens to have the functions of high resolution and wide angle, a method is generally adopted to reduce the use of aspherical lenses and reduce the number of lens groups and lens numbers.
In order to make the imaging of the projection lens high resolution, the number of lens groups or the number of aspherical lenses is generally increased to reduce aberrations, but this results in an increase in cost and difficulty in lens assembly. Therefore, how to combine the optical imaging quality, cost and assembling difficulty is one of the important points of projection lens product research.
Chinese patent CN109212727B discloses a projector and a projection lens, which mainly adopts a three-group architecture composed of a first lens group, a second lens group and a third lens group with negative, positive and positive focal powers, and the focusing purpose is achieved by only moving the second lens group.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a projection lens which can realize low cost, small volume, light weight and uniform high resolution and wide angle performance.
In order to achieve the above object, the present invention provides a projection lens, comprising, in order from an object side to an image side along an optical axis: the first lens group with negative focal power, the second lens group with positive focal power and the third lens group with positive focal power further comprise: a diaphragm and a fourth lens group with positive focal power.
According to an aspect of the present invention, the first lens group, the second lens group, and the third lens group are each movable in the optical axis direction.
According to an aspect of the present invention, the projection lens further includes a prism and two parallel plates, the prism being disposed between the two parallel plates, one of the parallel plates being disposed between the fourth lens group and the prism.
According to an aspect of the present invention, in a direction from an object side to an image side along an optical axis, the first lens group includes, in order: a first lens, a second lens and a third lens,
The first lens is a convex-concave lens;
The second lens is a concave-convex lens or a concave-convex lens;
the third lens is a concave-convex lens or a convex-concave lens.
According to one aspect of the invention, the optical power of both the first lens and the second lens is negative;
The third lens has positive optical power.
According to an aspect of the present invention, in a direction from an object side to an image side along an optical axis, the second lens group includes, in order: a fourth lens, a fifth lens and a sixth lens,
The fourth lens is a concave lens;
the fifth lens is a convex lens;
The sixth lens is a convex-concave lens or a convex-convex lens.
According to one aspect of the invention, the optical power of the fourth lens is negative;
The optical power of the fifth lens and the sixth lens are positive.
According to an aspect of the present invention, in a direction from an object side to an image side along an optical axis, the third lens group sequentially includes: a seventh lens and an eighth lens,
The seventh lens is a concave-concave lens;
the eighth lens is a convex lens.
According to one aspect of the invention, the optical power of the seventh lens is negative;
The focal power of the eighth lens is positive.
According to an aspect of the present invention, in a direction from an object side to an image side along an optical axis, the fourth lens group sequentially includes: a ninth lens, a tenth lens, an eleventh lens, a twelfth lens and a thirteenth lens,
The ninth lens is a concave-convex lens;
the tenth lens is a concave-concave lens;
the eleventh lens is a convex lens or a convex-concave lens;
the twelfth lens and the thirteenth lens are both convex-convex lenses.
According to an aspect of the present invention, the optical powers of the ninth lens, the eleventh lens, the twelfth lens, and the thirteenth lens are all positive;
the optical power of the tenth lens is negative.
According to one aspect of the present invention, the projection lens includes at least two aspherical lenses.
According to one aspect of the present invention, the aspherical lens satisfies the relation: nd is less than or equal to 1.6, wherein Nd represents refractive index.
According to one aspect of the present invention, the projection lens includes at least one cemented lens.
According to one aspect of the present invention, the focal length of the cemented lens and the focal length of the projection lens satisfy the relation: -6.97.ltoreq.Fa/F.ltoreq.37.04, where Fa denotes a focal length of the cemented lens and F denotes a focal length of the projection lens.
According to one aspect of the present invention, the focal length of the first lens group and the focal length of the projection lens satisfy the relationship: -3.14.ltoreq.F1/F.ltoreq.2.20, wherein F1 denotes a focal length of the first lens group, F denotes a focal length of the projection lens.
According to one aspect of the present invention, the focal length of the second lens group and the focal length of the projection lens satisfy the relationship: F2/F is more than or equal to 3.62 and less than or equal to 6.07, wherein F2 represents the focal length of the second lens group, and F represents the focal length of the projection lens.
According to one aspect of the present invention, the focal length of the third lens group and the focal length of the projection lens satisfy the relationship: 33.32.ltoreq.F3/F.ltoreq.46.14, wherein F3 represents the focal length of the third lens group, and F represents the focal length of the projection lens.
According to one aspect of the present invention, the focal length of the fourth lens group and the focal length of the projection lens satisfy the relationship: F4/F is less than or equal to 2.17 and less than or equal to 2.81, wherein F4 represents the focal length of the fourth lens group, and F represents the focal length of the projection lens.
According to the scheme of the invention, a projection lens adopting a four-group architecture with negative-positive optical power is provided. The lens comprises 13 lenses, the focal power of the lenses, the shapes of the object side surface and the image side surface and the number of the aspheric lenses and the spherical lenses are reasonably set, so that the light rays of the whole optical system of the projection lens can be stable, the projection lens can realize high resolution, the projection lens has wide-angle characteristics, and meanwhile, the projection lens has small volume and low cost. In addition, the refractive index of the aspheric lens is reasonably set and adjusted, so that the projection lens further has high resolution.
According to an aspect of the present invention, by adopting a four-group architecture in which the optical power is "negative-positive" and moving the first lens group, the second lens group, and the third lens group in the optical axis direction, the moving response speed between the entire projection optical system groups can be made faster.
According to the scheme of the invention, by arranging the cemented lens and adjusting the focal length of the cemented lens, the chromatic aberration and the aberration of the projection lens can be reduced, the tolerance sensitivity of an optical system can be reduced, and the assembly yield and the production yield of the projection lens can be improved. Meanwhile, by reasonably setting and adjusting the focal lengths of the four groups, tolerance sensitivity among the groups can be reduced, and the resolution and assembly yield of the projection lens are further improved.
Drawings
Fig. 1 schematically illustrates an optical structure of a projection lens according to a first embodiment of the present invention;
Fig. 2 schematically illustrates an optical structure of a projection lens according to a second embodiment of the present invention;
FIG. 3 is a schematic view schematically showing an optical structure of a projection lens according to a third embodiment of the present invention;
fig. 4 schematically shows an optical structure of a projection lens according to a fourth embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments will be briefly described below. It is apparent that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
In describing embodiments of the present invention, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in terms of orientation or positional relationship shown in the drawings for convenience of description and simplicity of description only, and do not denote or imply that the devices or elements in question must have a particular orientation, be constructed and operated in a particular orientation, so that the above terms are not to be construed as limiting the invention.
The present invention will be described in detail below with reference to the drawings and the specific embodiments, which are not described in detail herein, but the embodiments of the present invention are not limited to the following embodiments.
Fig. 1 schematically illustrates an optical structure of a projection lens according to an embodiment of the present invention. Referring to fig. 1, the projection lens of the present invention sequentially includes, along an optical axis, from an object side to an image side: the lens comprises a first lens group G1 with negative focal power, a second lens group G2 with positive focal power, a third lens group G3 with positive focal power, a diaphragm STO, a fourth lens group G4 with positive focal power, a parallel plate CG, a prism and another parallel plate CG. When the fourth lens group G4 is fixed, the first lens group G1, the second lens group G2 and the third lens group G3 are moved along the optical axis direction, so that the projection lens can achieve the focusing purpose, and meanwhile, the three groups of lenses are moved, so that the inter-group movement response speed of the whole projection optical system is faster. The stop STO is disposed between the third lens group G3 and the fourth lens group G4, and can control the image light quantity.
Along the direction from the object side to the image side of the optical axis, the first lens group G1 sequentially includes: the first lens L1, the second lens L2, and the third lens L3, and the second lens group G2 sequentially includes: the fourth lens L4, the fifth lens L5, and the sixth lens L6, and the third lens group G3 sequentially includes: the seventh lens L7 and the eighth lens L8, and the fourth lens group G4 sequentially includes: a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, and a thirteenth lens L13. In terms of optical power, the first lens L1, the second lens L2, the fourth lens L4, the seventh lens L7, and the tenth lens L10 of the projection lens each have negative optical power, and the third lens L3, the fifth lens L5, the sixth lens L6, the eighth lens L8, the ninth lens L9, the eleventh lens L11, the twelfth lens L12, and the thirteenth lens L13 each have positive optical power. In terms of lens shape, along the direction from the object side to the image side of the lens optical axis, the first lens L1 is a concave-convex lens, the second lens L2 is a concave-concave lens or a concave-convex lens, the third lens L3 is a concave-convex lens or a concave-convex lens, the fourth lens L4, the seventh lens L7 and the tenth lens L10 are all concave-concave lenses, the fifth lens L5, the eighth lens L8, the twelfth lens L12 and the thirteenth lens L13 are all convex-convex lenses, the sixth lens L6 and the eleventh lens L11 can be convex-concave lenses or convex-convex lenses, and the ninth lens L9 is a concave-convex lens. Therefore, the projection lens comprises 13 lenses in total, different focal powers are reasonably arranged for each lens, and different shapes are arranged on the respective object side surfaces and the image side surfaces, so that the light rays of the whole optical system are stable in trend and have high resolution when the projection lens images, and the wide-angle characteristic is realized.
In the invention, the projection lens further comprises at least two aspheric lenses. And the aspherical lens satisfies the relation: nd is less than or equal to 1.6, wherein Nd represents refractive index. The refractive index range of the aspheric lens in the projection lens is set and adjusted, so that the projection lens has high resolution. In addition, the design of the number of the aspheric lenses can reduce the cost of the projection lens, lighten the weight of the projection lens and realize small volume.
In the invention, the projection lens further comprises at least one cemented lens. And the focal length of the cemented lens and the focal length of the projection lens satisfy the relation: -Fa/F is less than or equal to 6.97 and less than or equal to 37.04. Where Fa denotes the focal length of the cemented lens, and F denotes the focal length of the lens. The cemented lens is formed by a tenth lens L10 and an eleventh lens L11 cemented. Through the setting of the cemented lens, the focal length range of the cemented lens is reasonably matched and adjusted, and the focal length of the cemented lens and the projection lens meet a certain ratio, the chromatic aberration and the aberration of the projection lens can be effectively reduced, the tolerance sensitivity of the optical system of the projection lens is reduced, and the production yield of the projection lens is improved while the low distortion of the projection lens is realized.
In the present invention, the focal lengths of the first lens group G1, the second lens group G2, the third lens group G3 and the fourth lens group G4 respectively satisfy the following relation with the focal length of the projection lens:
-3.14≤F1/F≤-2.20；
3.62≤F2/F≤6.07；
33.32≤F3/F≤46.14；
2.17≤F4/F≤2.81；
wherein F1, F2, F3, and F4 represent focal lengths of the first lens group, the second lens group, the third lens group, and the fourth lens group, respectively. The invention sets the corresponding focal length ranges for the lens groups of the four groups of structures reasonably, and the focal length ranges and the focal length of the projection lens meet a certain ratio and can be adjusted. By combining and collocating the group focal length ranges of the four groups of structures, the tolerance sensitivity among the groups of the projection lens is reduced, so that the projection lens has high resolution, the assembly yield of the projection lens is improved, and the wide-angle performance is realized.
In summary, the present invention adopts a four-group architecture with optical power of negative-positive, comprising thirteen lenses, and the optical power, surface and shape as described above are reasonably arranged, matched and combined for each lens, so that the projection lens has high resolution and wide angle performance. The fourth lens group is fixed, the first lens group, the second lens group and the third lens group are moved along the optical axis direction, the focusing purpose is achieved, and meanwhile the moving response speed of the whole projection optical imaging system is faster. In addition, the setting of the cemented lens in the projection lens, and reasonable setting, combination cemented lens's focus and four lens group's focus reduce projection lens optical imaging system's colour difference and aberration, reduce optical sensitivity, improve projection lens's equipment yield and production yield, also further improved projection lens's resolution. By arranging the number of the aspheric lenses, the projection lens can realize small volume, light weight and low cost.
The projection lens of the present invention is specifically described below in four embodiments. In the following embodiments, the projection lens of the present invention includes 13 lenses in total, and further includes a stop STO, two parallel plates CG, a prism, and an image side IMA. Here, the stop STO is denoted as one side STO, the image side face IMA is denoted as one side IMA, and the bonding surface of the bonding lens is denoted as one side. Each lens and the parallel plate CG have two sides, and the prism has three sides.
The parameters of the respective examples specifically satisfying the above conditional expression are shown in the following table 1:
TABLE 1
In the present invention, the aspherical lens of the projection lens satisfies the following formula:
In the above formula, z is the axial distance from the curved surface to the vertex at the position with the height h perpendicular to the optical axis along the optical axis direction; c represents the curvature at the apex of the aspherical curved surface; k is a conic coefficient; a 4、A6、A8、A10、A12、A14、A16 ··represents fourth order, sixth order, eighth order, tenth order, fourteenth order, sixteen order·aspheric coefficients, respectively.
Example 1
Referring to fig. 1, in the present embodiment, the second lens L2 is a concave-concave lens, the third lens L3 is a concave-convex lens, the sixth lens L6 is a convex-concave lens, and the eleventh lens L11 is a convex-convex lens. The fourth lens L4 and the fifth lens L5 are cemented to form a first cemented lens, and the tenth lens L10 and the eleventh lens L11 are cemented to form a second cemented lens.
Parameters of each lens of the projection lens of the present embodiment include a surface type, a radius of curvature R, a thickness d, a refractive index Nd of a material, abbe numbers Vd, and S1 to S32 represent surfaces of each lens, a cemented lens, a stop STO, a prism, and a parallel plate CG in the projection lens, as shown in table 2 below:
TABLE 2
The aspherical coefficients of each aspherical lens of the projection lens of the present embodiment include: the surface has a quadric constant K value, a fourth-order aspheric coefficient a 4, a sixth-order aspheric coefficient a 6, an eighth-order aspheric coefficient a 8, a tenth-order aspheric coefficient a 10, a twelfth-order aspheric coefficient a 12, and a fourteen-order aspheric coefficient a 14, as shown in table 3 below.
| Face number | K value | A4 | A6 | A8 | A10 | A12 | A14 |
| 3 | 0 | 9.34E-05 | -2.942E-07 | 8.434E-10 | -1.684E-12 | 2.057E-15 | -1.11E-18 |
| 4 | 0 | 7.54E-05 | -1.77E-07 | 1.96E-10 | 1.60E-13 | -8.20E-16 | 5.05E-19 |
| 17 | 0 | -6.74E-05 | -5.27E-07 | -3.10E-09 | -5.79E-11 | 0.00E+00 | 0.00E+00 |
| 18 | 0 | -4.35E-05 | -3.97E-07 | -5.92E-09 | 1.32E-11 | -2.06E-13 | 0.00E+00 |
| 22 | 0 | -1.17E-05 | 1.37E-09 | -5.06E-10 | 2.78E-12 | -2.23E-15 | 0.00E+00 |
| 23 | 0 | 2.74E-06 | -1.48E-08 | -3.57E-12 | -1.69E-12 | 4.37E-15 | 0.00E+00 |
TABLE 3 Table 3
Referring to fig. 1, the projection lens of the present embodiment has high resolution, fast moving response speed between lens groups of four-group architecture, low tolerance sensitivity between lens groups, high production yield and assembly yield, and wide angle performance. In addition, the projection lens is small in size, light in weight and low in cost.
Example two
Referring to fig. 2, in the present embodiment, the second lens L2 is a concave-concave lens, the third lens L3 is a concave-convex lens, the sixth lens L6 is a convex-concave lens, and the eleventh lens L11 is a convex-convex lens. The fourth lens L4 and the fifth lens L5 are cemented to form a first cemented lens, and the tenth lens L10 and the eleventh lens L11 are cemented to form a second cemented lens.
Parameters of each lens of the projection lens of the present embodiment include a surface type, a radius of curvature R, a thickness d, a refractive index Nd of a material, abbe numbers Vd, and S1 to S32 represent surfaces of each lens, a cemented lens, a stop STO, a prism, and a parallel plate CG in the projection lens, as shown in table 4 below:
TABLE 4 Table 4
The aspherical coefficients of each aspherical lens of the projection lens of the present embodiment include: the surface has a quadric constant K value, a fourth-order aspheric coefficient a 4, a sixth-order aspheric coefficient a 6, an eighth-order aspheric coefficient a 8, a tenth-order aspheric coefficient a 10, a twelfth-order aspheric coefficient a 12, and a fourteen-order aspheric coefficient a 14, as shown in table 5 below.
TABLE 5
Referring to fig. 2, the projection lens of the present embodiment has high resolution, fast moving response speed between lens groups of four-group architecture, low tolerance sensitivity between lens groups, high production yield and assembly yield, and wide-angle performance, as shown in the above data of table 1, table 4 and table 5. In addition, the projection lens is small in size, light in weight and low in cost.
Example III
Referring to fig. 3, in the present embodiment, the second lens L2 is a concave-concave lens, the third lens L3 is a concave-convex lens, the sixth lens L6 is a convex-concave lens, and the eleventh lens L11 is a convex-convex lens. The fourth lens L4 and the fifth lens L5 are cemented to form a first cemented lens, and the tenth lens L10 and the eleventh lens L11 are cemented to form a second cemented lens.
Parameters of each lens of the projection lens of the present embodiment include a surface type, a radius of curvature R, a thickness d, a refractive index Nd of a material, abbe numbers Vd, and S1 to S32 represent surfaces of each lens, a cemented lens, a stop STO, a prism, and a parallel plate CG in the projection lens, as shown in table 6 below:
TABLE 6
The aspherical coefficients of each aspherical lens of the projection lens of the present embodiment include: the surface has a quadric constant K value, a fourth-order aspheric coefficient a 4, a sixth-order aspheric coefficient a 6, an eighth-order aspheric coefficient a 8, a tenth-order aspheric coefficient a 10, a twelfth-order aspheric coefficient a 12, and a fourteen-order aspheric coefficient a 14, as shown in table 7 below.
| Face number | K value | A4 | A6 | A8 | A10 | A12 | A14 |
| 3 | 0 | 7.11E-05 | -2.53E-07 | 7.44E-10 | -1.507E-12 | 1.84E-15 | -9.86E-19 |
| 4 | 0 | 5.56E-05 | -1.96E-07 | 3.73E-10 | -3.78E-13 | 5.45E-17 | 5.65E-20 |
| 17 | 0 | -3.63E-05 | -1.15E-07 | -2.46E-09 | 4.30E-12 | 3.19E-27 | 3.03E-30 |
| 18 | 0 | -1.75E-05 | -1.45E-07 | -4.07E-09 | 4.97E-11 | -2.06E-13 | 3.26E-30 |
| 22 | 0 | 8.03E-06 | -4.89E-08 | -6.19E-10 | 3.54E-12 | -3.39E-16 | 2.75E-30 |
| 23 | 0 | 1.40E-05 | -9.61E-09 | -2.22E-10 | -1.47E-12 | 8.20E-15 | 3.25E-30 |
TABLE 7
Referring to fig. 3, the projection lens of the present embodiment has high resolution, fast moving response speed between lens groups of four-group architecture, low tolerance sensitivity between lens groups, high production yield and assembly yield, and wide-angle performance, as shown in the above data of table 1, table 6 and table 7. In addition, the projection lens is small in size, light in weight and low in cost.
Example IV
Referring to fig. 4, in the present embodiment, the second lens L2 is a concave-convex type lens, the third lens L3 is a convex-concave type lens, the sixth lens L6 is a convex-convex type lens, and the eleventh lens L11 is a convex-concave type lens. The tenth lens L10 and the eleventh lens L11 are cemented to constitute a first cemented lens.
Parameters of each lens of the projection lens of the present embodiment include a surface type, a radius of curvature R, a thickness d, a refractive index Nd of a material, abbe numbers Vd, and S1 to S33 represent surfaces of each lens, a cemented lens, a stop STO, a prism, and a parallel plate CG in the projection lens, as shown in table 8 below:
TABLE 8
The aspherical coefficients of each aspherical lens of the projection lens of the present embodiment include: the quadric surface constant K value, fourth-order aspheric coefficient a 4, sixth-order aspheric coefficient a 6, eighth-order aspheric coefficient a 8, tenth-order aspheric coefficient a 10, twelve-order aspheric coefficient a 12, and fourteen-order aspheric coefficient a 14 of the surface are shown in table 9 below.
| Face number | K value | A4 | A6 | A8 | A10 | A12 | A14 |
| 3 | 0 | 1.237E-04 | -3.703E-07 | 9.852E-10 | -1.702E-12 | 1.67E-15 | -6.08E-19 |
| 4 | 0 | 9.41E-05 | -2.25E-07 | 2.27E-10 | 4.50E-13 | -1.86E-15 | 1.91E-18 |
| 18 | 0 | -1.36E-05 | -7.53E-08 | 5.03E-10 | -8.51E-12 | 4.39E-26 | 0.00E+00 |
| 19 | 0 | 3.16E-05 | 1.03E-07 | -4.14E-09 | 4.49E-11 | -2.06E-13 | 0.00E+00 |
TABLE 9
As can be seen from fig. 4, the projection lens of the present embodiment has high resolution, fast moving response speed between lens groups of four-group architecture, low tolerance sensitivity between lens groups, high production yield and assembly yield, and wide-angle performance by the data of table 1, table 8, and table 9. In addition, the projection lens is small in size, light in weight and low in cost.
The above description is only one embodiment of the present invention and is not intended to limit the present invention, and various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (16)
1. A projection lens comprising, in order from an object side to an image side along an optical axis: the optical system is characterized by further comprising a first lens group (G1) with negative focal power, a second lens group (G2) with positive focal power, and a third lens group (G3) with positive focal power: a Stop (STO) and a fourth lens group (G4) having positive optical power;
The first lens group (G1), the second lens group (G2) and the third lens group (G3) are each movable in the optical axis direction;
The second lens group (G2) sequentially includes: a fourth lens (L4), a fifth lens (L5) and a sixth lens (L6),
The fourth lens (L4) is a concave lens;
the fifth lens (L5) is a convex lens;
the sixth lens (L6) is a convex-concave lens or a convex-convex lens;
the optical power of the fourth lens (L4) is negative;
the optical powers of the fifth lens (L5) and the sixth lens (L6) are positive.
2. Projection lens according to claim 1, characterized in that it further comprises a prism and two parallel plates (CG), the prism being arranged between the two parallel plates (CG), one of the parallel plates (CG) being arranged between the fourth lens group (G4) and the prism.
3. Projection lens according to claim 1, characterized in that the first lens group (G1) comprises, in order from the object side to the image side along the optical axis: a first lens (L1), a second lens (L2) and a third lens (L3),
The first lens (L1) is a convex-concave lens;
the second lens (L2) is a concave lens or a concave-convex lens;
the third lens (L3) is a meniscus lens or a convex-concave lens.
4. A projection lens according to claim 3, wherein,
The optical powers of the first lens (L1) and the second lens (L2) are negative;
The optical power of the third lens (L3) is positive.
5. Projection lens according to claim 1, characterized in that the third lens group (G3) comprises, in order from the object side to the image side along the optical axis: a seventh lens (L7) and an eighth lens (L8),
The seventh lens (L7) is a concave-concave lens;
The eighth lens (L8) is a convex lens.
6. The projection lens of claim 5 wherein the lens is configured to,
The focal power of the seventh lens (L7) is negative;
the optical power of the eighth lens (L8) is positive.
7. Projection lens according to claim 1, characterized in that the fourth lens group (G4) comprises, in order from the object side to the image side along the optical axis: a ninth lens (L9), a tenth lens (L10), an eleventh lens (L11), a twelfth lens (L12), and a thirteenth lens (L13),
The ninth lens (L9) is a concave-convex lens;
the tenth lens (L10) is a concave lens;
The eleventh lens (L11) is a convex lens or a concave-convex lens;
The twelfth lens (L12) and the thirteenth lens (L13) are both convex-convex lenses.
8. The projection lens of claim 7 wherein the lens is configured to,
The optical powers of the ninth lens (L9), the eleventh lens (L11), the twelfth lens (L12), and the thirteenth lens (L13) are all positive;
the optical power of the tenth lens (L10) is negative.
9. The projection lens of any one of claims 1 to 8, wherein the projection lens comprises at least two aspherical lenses.
10. The projection lens of claim 9 wherein the aspherical lens satisfies the relationship: nd is less than or equal to 1.6, wherein Nd represents refractive index.
11. The projection lens of any one of claims 1 to 8, wherein the projection lens comprises at least one cemented lens.
12. The projection lens of claim 11, wherein a focal length of the cemented lens and a focal length of the projection lens satisfy the relationship: -6.97.ltoreq.Fa/F.ltoreq.37.04, where Fa denotes a focal length of the cemented lens and F denotes a focal length of the projection lens.
13. Projection lens according to any one of claims 1 to 8, characterized in that the focal length of the first lens group (G1) and the focal length of the projection lens satisfy the relation: -3.14.ltoreq.F1/F.ltoreq.2.20, wherein F1 denotes a focal length of the first lens group, F denotes a focal length of the projection lens.
14. Projection lens according to any one of claims 1 to 8, characterized in that the focal length of the second lens group (G2) and the focal length of the projection lens satisfy the relation: F2/F is more than or equal to 3.62 and less than or equal to 6.07, wherein F2 represents the focal length of the second lens group, and F represents the focal length of the projection lens.
15. Projection lens according to any one of claims 1 to 8, characterized in that the focal length of the third lens group (G3) and the focal length of the projection lens satisfy the relation: 33.32.ltoreq.F3/F.ltoreq.46.14, wherein F3 represents the focal length of the third lens group, and F represents the focal length of the projection lens.
16. Projection lens according to any one of claims 1 to 8, characterized in that the focal length of the fourth lens group (G4) and the focal length of the projection lens satisfy the relation: F4/F is less than or equal to 2.17 and less than or equal to 2.81, wherein F4 represents the focal length of the fourth lens group, and F represents the focal length of the projection lens.
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| CN113885185B true CN113885185B (en) | 2024-06-04 |
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| CN114609776B (en) * | 2022-03-24 | 2023-08-04 | 杭州海康威视数字技术股份有限公司 | Optical system |
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