CN216351501U - Projection lens - Google Patents
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- CN216351501U CN216351501U CN202122700243.4U CN202122700243U CN216351501U CN 216351501 U CN216351501 U CN 216351501U CN 202122700243 U CN202122700243 U CN 202122700243U CN 216351501 U CN216351501 U CN 216351501U
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Abstract
The utility model relates to a projection lens, which sequentially comprises the following components in the direction from an object side to an image side along an optical axis: a first lens group (G1) having negative optical power, a second lens group (G2) having positive optical power, a third lens group (G3) having positive optical power, a Stop (STO), and a fourth lens group (G4) having positive optical power. The projection lens has the advantages of high inter-group movement response speed, low tolerance sensitivity, high resolving power, realization of the wide-angle characteristic of the lens, small volume, low cost and high assembly yield of the lens.
Description
Technical Field
The utility model relates to the technical field of optical imaging systems, in particular to a projection lens.
Background
The development trend of projection lenses is low cost, high resolution and wide angle. In a competitive market, in order to achieve the purposes of reducing the cost, volume and weight of the lens and simultaneously to make the projection lens have high resolution and wide-angle functions, the methods of reducing the use of aspheric lenses and reducing the number of lens groups and the number of lenses are generally adopted.
In order to achieve high resolution of the projection lens, the number of lens groups or the number of aspheric lenses is usually increased to reduce the aberration, but this results in increased cost and difficulty in assembling the lens. Therefore, how to combine the optical imaging quality, cost and assembling difficulty becomes one of the major issues in the research of projection lens products.
Chinese patent CN109212727B discloses a projector and a projection lens, which mainly adopts a three-group structure composed of a first lens group, a second lens group and a third lens group, wherein the focal powers of the first lens group, the second lens group and the third lens group are respectively negative, positive and positive, and the purpose of focusing is achieved by moving only the second lens group.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects in the prior art, the present invention provides a projection lens, which has the advantages of low cost, small size, light weight, and uniform high resolution and wide angle performance.
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, the third lens group with positive focal power, also include: a diaphragm and a fourth lens group having positive optical power.
According to one aspect of the present invention, the first lens group, the second lens group, and the third lens group are movable in an 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, wherein one of the parallel plates is disposed between the fourth lens group and the prism.
According to an aspect of the present invention, the first lens group includes, in order in a direction from an object side to an image side along an optical axis: a first lens, a second lens and a third lens,
the first lens is a convex-concave lens;
the second lens is a concave-concave lens or a concave-convex lens;
the third lens is a concave-convex lens or a concave-convex lens.
According to one aspect of the utility model, the optical powers of the first and second lenses are both negative;
the focal power of the third lens is positive.
According to an aspect of the present invention, the second lens group includes, in order from an object side to an image side along an optical axis: a fourth lens, a fifth lens and a sixth lens,
the fourth lens is a concave-concave lens;
the fifth lens is a convex lens;
the sixth lens is a convex-concave lens or a convex-convex lens.
According to an aspect of the utility model, the optical power of the fourth lens is negative;
the focal power of the fifth lens and the focal power of the sixth lens are both positive.
According to an aspect of the present invention, the third lens group includes, in order from an object side to an image side along an optical axis: a seventh lens and an eighth lens,
the seventh lens is a concave-concave lens;
the eighth lens is a convex lens.
According to an aspect of the utility model, the power of the seventh lens is negative;
the power of the eighth lens is positive.
According to an aspect of the present invention, the fourth lens group includes, in order from the object side to the image side along the optical axis: 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-convex lens or a convex-concave lens;
the twelfth lens and the thirteenth lens are both 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 power of the tenth lens is negative.
According to one aspect of the utility model, the projection lens comprises at least two aspheric lenses.
According to an aspect of the present invention, the aspherical lens satisfies a 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 comprises a cemented lens.
According to an aspect of the present invention, a focal length of the cemented lens and a focal length of the projection lens satisfy a relation: 6.97 < Fa/F < 37.04, where Fa denotes the focal length of the cemented lens and F denotes the focal length of the projection lens.
According to one aspect of the utility model, the focal length of the first lens group and the focal length of the projection lens satisfy the relation: -3.14 ≦ F1/F ≦ -2.20, where F1 represents the focal length of the first lens group and F represents the focal length of the projection lens.
According to one aspect of the utility model, the focal length of the second lens group and the focal length of the projection lens satisfy the relation: 3.62 ≦ F2/F ≦ 6.07, where F2 denotes the focal length of the second lens group and F denotes the focal length of the projection lens.
According to one aspect of the utility model, the focal length of the third lens group and the focal length of the projection lens satisfy the relation: 33.32 ≦ F3/F ≦ 46.14, where F3 denotes the focal length of the third lens group and F denotes the focal length of the projection lens.
According to one aspect of the utility model, the focal length of the fourth lens group and the focal length of the projection lens satisfy the relation: 2.17 ≦ F4/F ≦ 2.81, where F4 denotes the focal length of the fourth lens group and F denotes the focal length of the projection lens.
According to the scheme of the utility model, the projection lens adopts a four-group structure with the focal power of negative-positive. The lens comprises 13 lenses, the focal power, the shapes of the object side surface and the image side surface of the lens and the quantity of the aspheric lens and the spherical lens are reasonably set, so that the light trend of the whole optical system of the projection lens is stable, the projection lens realizes high resolution, has wide-angle characteristic, and simultaneously realizes 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 employing a four-group structure having optical powers of "negative-positive", and moving the first lens group, the second lens group, and the third lens group in the optical axis direction, the movement response speed among the entire projection optical system groups can be made faster.
According to one scheme of the utility model, 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 is reduced, and the assembly yield and the production yield of the projection lens are improved. Meanwhile, by reasonably setting and adjusting the focal lengths of the four groups, the tolerance sensitivity among the groups can be reduced, and the resolution and the assembly yield of the projection lens are further improved.
Drawings
Fig. 1 is a schematic diagram illustrating an optical structure of a projection lens according to a first embodiment of the utility model;
fig. 2 is a schematic diagram illustrating an optical structure of a projection lens according to a second embodiment of the utility model;
fig. 3 is a schematic diagram illustrating an optical structure of a projection lens according to a third embodiment of the present invention;
fig. 4 is a schematic diagram of 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 used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the utility model, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
In describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship that is based on the orientation or positional relationship shown in the associated drawings, which is for convenience and simplicity of description only, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above-described terms should not be construed as limiting the present invention.
The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated 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 includes, in order along an optical axis from an object side to an image side: a first lens group G1 with negative optical power, a second lens group G2 with positive optical power, a third lens group G3 with positive optical power, a stop STO, a fourth lens group G4 with positive optical power, one 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 objective of focusing can be achieved by the projection lens, and the response speed of inter-group movement of the entire projection optical system can be increased by moving the three lens groups at the same time. The stop STO is provided between the third lens group G3 and the fourth lens group G4, and can control the amount of image light passing therethrough.
In the direction from the object side to the image side along the optical axis, the first lens group G1 includes, in order: the first lens L1, the second lens L2, and the third lens L3, the second lens group G2 including in order: the fourth lens L4, the fifth lens L5, and the sixth lens L6, the third lens group G3 including in order: the seventh lens L7 and the eighth lens L8, the fourth lens group G4 includes in order: 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, in a direction from the object side to the image side along the optical axis of the lens, 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 convex-concave 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 both 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 set for each lens, and different shapes are set for the object side surface and the image side surface of each lens.
In the utility model, the projection lens further comprises at least two aspheric lenses. And the aspheric 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, reduce the weight of the projection lens and realize small volume.
In the utility model, the projection lens further comprises a cemented lens. And the focal length of the cemented lens and the focal length of the projection lens satisfy the relation: Fa/F is more than or equal to 6.97 and less than or equal to 37.04. Where Fa denotes a focal length of the cemented lens and F denotes a focal length of the lens. The cemented lens is formed by cementing the tenth lens L10 and the eleventh lens L11. Through the arrangement of the cemented lens and the reasonable collocation and adjustment of the focal length range of the cemented lens, and the focal length of the cemented lens meets a certain ratio with the focal length of the projection lens, 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 and the focal length of the projection lens satisfy the following relations, respectively:
-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 denote focal lengths of the first lens group, the second lens group, the third lens group, and the fourth lens group, respectively. The utility model reasonably sets the focal length range corresponding to the four groups of lens groups respectively, and the focal length ranges and the focal length of the projection lens meet a certain ratio and are adjustable. By the combination and matching of the group focal length ranges of the four groups of structures, the tolerance sensitivity among the groups of the projection lenses is reduced, the projection lenses have high resolution, the assembly yield of the projection lenses is improved, and the projection lenses have wide-angle performance.
In summary, the projection lens of the present invention adopts four groups of structures with focal powers of negative-positive, and includes thirteen lenses, and the focal powers, the surface shapes and the shapes of the lenses are reasonably arranged, matched and combined, so that the projection lens has high resolution and wide-angle performance. The first lens group, the second lens group and the third lens group are moved along the optical axis direction by fixing the fourth lens group to be fixed, so that the purpose of focusing is achieved, and meanwhile, the moving response speed among the whole projection optical imaging system groups is higher. In addition, the arrangement of the cemented lens in the projection lens, the reasonable arrangement and the combination of the focal length of the cemented lens and the focal lengths of the four lens groups reduce the chromatic aberration and the aberration of the optical imaging system of the projection lens, reduce the optical sensitivity, improve the assembly yield and the production yield of the projection lens, and further improve the resolution of the projection lens. By setting 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 comprises 13 lenses, a stop STO, two parallel plates CG, a prism, and an image side surface IMA. Here, the stop STO is denoted as one face STO, the image side face IMA is denoted as one face IMA, and the cemented surface of the cemented lens is denoted as one face. Each lens and the parallel flat plate CG have two faces, and the prism has three faces.
The parameters of each example specifically satisfying the above conditional expressions are shown in table 1 below:
TABLE 1
In the utility model, the aspheric 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 of the height h perpendicular to the optical axis along the optical axis direction; c represents the curvature at the apex of the aspherical surface; k is a conic coefficient; a. the4、A6、A8、A10、A12、A14、A16The aspherical coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth and sixteenth orders are expressed respectively.
Example one
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 concave-convex lens, and the eleventh lens L11 is a convex-convex lens. The fourth lens L4 and the fifth lens L5 are cemented to constitute a first cemented lens, and the tenth lens L10 and the eleventh lens L11 are cemented to constitute a second cemented lens.
The parameters of each lens of the projection lens of the present embodiment include a surface type, a curvature radius R, a thickness d, a refractive index Nd of a material, an abbe number Vd, and S1 to S32 represent the 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 aspheric coefficients of the aspheric lenses of the projection lens of the embodiment include: the quadric surface constant K value and the fourth-order aspheric surface coefficient A of the surface4Sixth order aspherical surface coefficient A6Eighth order aspheric surface coefficient A8Ten-order aspheric surface coefficient A10Twelve-order aspheric surface coefficient A12And fourteen order aspheric coefficients A14As shown in table 3 below.
TABLE 3
As can be seen from fig. 1, according to the data in tables 1 to 3, the projection lens of the present embodiment has high resolution, fast response speed between lens groups of the four-group structure, 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 concave-convex lens, and the eleventh lens L11 is a convex-convex lens. The fourth lens L4 and the fifth lens L5 are cemented to constitute a first cemented lens, and the tenth lens L10 and the eleventh lens L11 are cemented to constitute a second cemented lens.
The parameters of each lens of the projection lens of the present embodiment include a surface type, a curvature radius R, a thickness d, a refractive index Nd of a material, an abbe number Vd, and S1 to S32 represent the 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
The aspheric coefficients of the aspheric lenses of the projection lens of the embodiment include: the quadric surface constant K value and the fourth-order aspheric surface coefficient A of the surface4Sixth order aspherical surface coefficient A6Eighth order aspheric surface coefficient A8Ten-order aspheric surface coefficient A10Twelve-order aspheric surface coefficient A12And fourteen order aspheric coefficients A14As shown in table 5 below.
| Number of noodles | Value of K | A4 | A6 | A8 | A10 | A12 | A14 |
| 3 | 0 | 8.61E-05 | -2.92E-07 | 8.53E-10 | -1.71E-12 | 2.07E-15 | -1.09E-18 |
| 4 | 0 | 7.10E-05 | -1.94E-07 | 2.29E-10 | 2.57E-13 | -1.31E-15 | 1.15E-18 |
| 17 | 0 | -6.07E-05 | -3.68E-07 | -1.89E-09 | -5.23E-11 | -9.64E-26 | 0.00E+00 |
| 18 | 0 | -4.38E-05 | -1.78E-07 | -6.06E-09 | 2.91E-11 | -2.06E-13 | 0.00E+00 |
| 22 | 0 | -1.10E-05 | 3.80E-08 | -9.35E-10 | 4.05E-12 | -2.23E-15 | 0.00E+00 |
| 23 | 0 | 4.74E-06 | -5.90E-09 | -1.67E-10 | -1.42E-12 | 2.69E-15 | 0.00E+00 |
TABLE 5
As can be seen from fig. 2, according to the data in tables 1, 4 and 5, the projection lens of the present embodiment has high resolution, fast response speed of movement between the lens groups of the four-group structure, low tolerance sensitivity between the 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 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 concave-convex lens, and the eleventh lens L11 is a convex-convex lens. The fourth lens L4 and the fifth lens L5 are cemented to constitute a first cemented lens, and the tenth lens L10 and the eleventh lens L11 are cemented to constitute a second cemented lens.
The 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, an abbe number Vd, and S1 to S32 represent the 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 aspheric coefficients of the aspheric lenses of the projection lens of the embodiment include: the quadric surface constant K value and the fourth-order aspheric surface coefficient A of the surface4Sixth order aspherical surface coefficient A6Eighth order aspheric surface coefficient A8Ten-order aspheric surface coefficient A10Twelve-order aspheric surface coefficient A12And fourteen order aspheric coefficients A14As shown in table 7 below.
| Number of noodles | Value of K | 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
As can be seen from fig. 3, the data in tables 1, 6 and 7 show that the projection lens of the present embodiment has high resolution, fast response speed of movement between the lens groups of the four-group structure, low tolerance sensitivity between the 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 four
Referring to fig. 4, in the present embodiment, the second lens L2 is a concave-convex lens, the third lens L3 is a concave-convex lens, the sixth lens L6 is a convex-convex lens, and the eleventh lens L11 is a concave-convex lens. The tenth lens L10 and the eleventh lens L11 are cemented to constitute a first cemented lens.
The parameters of each lens of the projection lens of the present embodiment include a surface type, a curvature radius R, a thickness d, a refractive index Nd of a material, an abbe number Vd, and S1 to S33 represent the 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 aspheric coefficients of the aspheric lenses of the projection lens of the embodiment include: the quadric surface constant K value and the fourth-order aspheric surface coefficient A of the surface4Sixth order aspherical surface coefficient A6Eighth order aspheric surface coefficient A8Ten-order aspheric surface coefficient A10Twelve-order aspheric surface coefficient A12And fourteen order aspheric coefficients A14As shown in table 9 below.
| Number of noodles | Value of K | 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 data in tables 1, 8 and 9 show that the projection lens of the present embodiment has high resolution, fast response speed of movement between the lens groups of the four-group structure, low tolerance sensitivity between the 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.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and it is apparent to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (19)
1. A projection lens includes, in order from an object side to an image side along an optical axis: a first lens group (G1) having negative optical power, a second lens group (G2) having positive optical power, and a third lens group (G3) having positive optical power, characterized by further comprising: a Stop (STO) and a fourth lens group (G4) having positive optical power.
2. The projection lens of claim 1, wherein the first lens group (G1), the second lens group (G2), and the third lens group (G3) are all movable in an optical axis direction.
3. The projection lens of claim 1, characterized in that it further comprises a prism and two parallel plates (CG), said prism being arranged between said two parallel plates (CG), wherein one of said parallel plates (CG) is arranged between said fourth lens group (G4) and said prism.
4. The projection lens of claim 1, wherein the first lens group (G1) comprises, in order along an optical axis from an object side to an image side: a first lens (L1), a second lens (L2), and a third lens (L3),
the first lens (L1) is a concave-convex lens;
the second lens (L2) is a concave-concave type lens or a concave-convex type lens;
the third lens (L3) is a concave-convex lens or a concave-convex lens.
5. The projection lens of claim 4,
the optical powers of the first lens (L1) and the second lens (L2) are both negative;
the third lens (L3) has positive optical power.
6. The projection lens of claim 1, wherein the second lens group (G2) comprises, in order along an optical axis from an object side to an image side: a fourth lens (L4), a fifth lens (L5), and a sixth lens (L6),
the fourth lens (L4) is a concave-concave type lens;
the fifth lens (L5) is a convex lens;
the sixth lens (L6) is a convex-concave lens or a convex-convex lens.
7. The projection lens of claim 6,
the optical power of the fourth lens (L4) is negative;
the optical powers of the fifth lens (L5) and the sixth lens (L6) are both positive.
8. The projection lens of claim 1, wherein the third lens group (G3) comprises, in order along an optical axis from an object side to an image side: a seventh lens (L7) and an eighth lens (L8),
the seventh lens (L7) is a concave-concave type lens;
the eighth lens (L8) is a convex lens.
9. The projection lens of claim 8,
the optical power of the seventh lens (L7) is negative;
the power of the eighth lens (L8) is positive.
10. The projection lens of claim 1, wherein the fourth lens group (G4) comprises, in order along an optical axis from an object side to an image side: 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-concave type lens;
the eleventh lens (L11) is a convex-convex lens or a convex-concave lens;
the twelfth lens (L12) and the thirteenth lens (L13) are both convex lenses.
11. The projection lens of claim 10,
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 tenth lens (L10) has negative optical power.
12. The projection lens of any one of claims 1 to 11 wherein the projection lens comprises at least two aspheric lenses.
13. The projection lens of claim 12 wherein the aspheric lens satisfies the relationship: nd is less than or equal to 1.6, wherein Nd represents refractive index.
14. The projection lens of any of claims 1 to 11 wherein the projection lens comprises a cemented lens.
15. The projection lens of claim 14 wherein the focal length of the cemented lens and the focal length of the projection lens satisfy the relationship: 6.97 < Fa/F < 37.04, where Fa denotes the focal length of the cemented lens and F denotes the focal length of the projection lens.
16. Projection lens according to any of claims 1 to 11, 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 ≦ F1/F ≦ -2.20, where F1 represents the focal length of the first lens group and F represents the focal length of the projection lens.
17. Projection lens according to any of claims 1 to 11, characterized in that the focal length of the second lens group (G2) and the focal length of the projection lens satisfy the relation: 3.62 ≦ F2/F ≦ 6.07, where F2 denotes the focal length of the second lens group and F denotes the focal length of the projection lens.
18. Projection lens according to any of claims 1 to 11, 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 ≦ F3/F ≦ 46.14, where F3 denotes the focal length of the third lens group and F denotes the focal length of the projection lens.
19. Projection lens according to any of claims 1 to 11, characterized in that the focal length of the fourth lens group (G4) and the focal length of the projection lens satisfy the relation: 2.17 ≦ F4/F ≦ 2.81, where F4 denotes the focal length of the fourth lens group and F denotes the focal length of the projection lens.
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