TW200823487A - Zoom lens - Google Patents

Abstract

A zoom lens is provided. The zoom lens includes a first lens group, a second lens group, a third lens group and a fourth lens group which are arranged in order from an object side to an image side. The second lens group is disposed and suitable for moving between the first lens group and the third lens group, and the fourth lens group is disposed and suitable for moving between the third lens group and the image side. The firs lens group has positive refractive power and includes at least a first compound lens. The second lens group has negative refractive power and includes at least a second compound lens. The second compound lens has at least one aspheric lens, wherein a bonding surface thereof is a concave surface and it faces the object side. The third lens group has positive refractive power, and includes at least one aspheric lens. The fourth lens group has positive refractive power and includes at least one biconvex lens and a compound lens in order form the object side to the image side. The zoom lens has advantages of high magnification and small volume.

Description

200823487 jt 1 / / / ^2080twf.doc/n IX. Description of the Invention: [Technical Field] The present invention relates to a lens, and more particularly to a zoom lens 先前 [Prior Art] With the advancement of modern video technology, digital video cameras (DVC) and digital cameras (DC) and other imaging devices have been widely used. One of the core components in these imaging devices is zoom

The optical zoom of the zoom lens allows the far and near images to be clearly focused on the charge coupled device (CCD). Therefore, the optical quality of the zoom lens is closely related to the quality of the image. In the highly competitive market, manufacturers are not committed to improving the quality of the zoom lens and reducing its production cost to enhance the competitive advantage of the above-mentioned image device. In addition, in order to meet the needs of light, thin, short and small image devices, manufacturers are also working to improve the design of the zoom lens to reduce the volume of the zoom lens. Referring to Figure 1, a conventional zoom lens is disclosed in the patent. The zoom lens just includes four lens groups ιι〇, i2〇130, 140', wherein the lens group 11〇 is composed of three lenses ι 2, ^ is composed of three lenses 122, and the lens group 13G is composed of three ϋ Ϊ The composition "and the lens group 140 is composed of two lenses 142 to magnify the magnification mirror group 140_time" is the entire lens group 14. The position of the body is: 200823487 ^i/// z2080twf.doc/n The image of the body is clear. Such a structure utilizing the rear group focus can effectively reduce the volume and the smashing group of the zoom lens 100 compared to the structure using the & focus, however, in the zoom lens 100, since the lens group is a non-spherical molded glass lens Combined with two spherical lenses, the overall yield is not easy to increase. In addition, aspherical molding is quite important in correcting aberrations. However, in the lens group, the aspherical molded glass lens is matched with two spherical lenses with high refractive index (ind(3) 〇frefracti〇n), which makes the tolerance accumulation too serious, and the yield of the overall mass production is unfavorable. Increase production costs. 2, another conventional zoom lens 2 is disclosed in U.S. Patent No. 5,784,205. The zoom lens 2 includes four lens groups 210, 220, 230, 240, wherein the lens group 210 is composed of three lenses 212, the lens group 220 is composed of three lenses 222, and the lens group 23 is composed of two The sheet lens 232 is composed of a lens group 24 组成 composed of three lenses 242. When the zoom lens 200 is in the zooming process, the lens groups 22〇, 23〇, and _ 24〇 must be relatively moved at the same time to achieve the purpose of changing the magnification. However, the interlocking architecture of the two lens groups 220, 230, 240 is complicated in the design of the mechanism, which tends to make the overall mechanism bulky. Further, since there are many movable lens groups, the assembly tolerance of each lens must be more strict to ensure the optical quality of the zoom lens 200, which increases the production cost of the zoom lens 200. SUMMARY OF THE INVENTION It is an object of the present invention to provide a zoom lens which has the advantages of high magnification and a small volume of 7 200823487 PT777 22〇8〇twf.doc/n. Other objects and advantages of the present invention will be apparent from the technical features disclosed herein. In order to achieve one or a part or all of the above or other purposes, the present invention provides a zoom lens including a first lens group sequentially arranged from an object side to an image side. a second lens group, a second lens group, and a fourth lens group, wherein the second lens group is adapted to move between the first lens group and the third lens group, and the fourth lens group is adapted to be a second lens Move between the group and the image side. Further, the first lens group has positive refractive power and includes at least one first composite lens. The second lens group has a negative refractive power and includes at least one second composite lens, and the second composite lens includes at least one aspherical lens, wherein one of the aspherical lenses has a concave surface and the adhesive surface faces the object side. The third lens group has a positive power and includes at least one aspheric lens. The fourth lens group has a positive refracting power and includes a lenticular lens and a third composite lens at least arranged from the object side to the image side. In an embodiment of the present invention, the first lens group may be composed of a first lens, a second lens and a third lens arranged in order from the object side to the image side, wherein the first lens, the first lens The diopter of the second lens and the third lens are negative, positive, and positive in sequence. In an embodiment of the invention, the distance from the first lens to the image side is L ′ and the zoom ratio of the zoom lens is X, and L/χ g 2.5. In an embodiment of the present invention, the second lens has an Abbe number less than 60 〇200823487 π / / /202080 ftf.doc/n. In the lens real-time, the above-mentioned composite lens is composed of the first two And the first lens and the third lens are both convex--6 concave lenses' and the second lens is a convex flat lens with a convex surface facing the object side. In the embodiment, the second lens group described above may be composed of a fourth lens, a fifth lens and a sixth lens arranged in order from the object side to the image side. The illuminance of the fourth lens to the sixth lens (four) may be negative, positive or negative.

In an embodiment of the invention, the fifth lens has a dispersion value of Vd5, and the sixth lens has a dispersion value of vd6, and |Vd5 - Vd6丨^16〇, in an embodiment of the invention, the above The second composite lens is composed of a fifth lens and a sixth lens, and the fourth lens is a convex-concave lens with a convex surface facing the object side, the fifth lens is a lenticular lens, and the sixth lens is a 雔 lens. In an embodiment of the present invention, the third lens group is composed of a seventh lens and an eighth lens arranged in sequence from the object side to the image side, and the refracting power of the seventh lens and the eighth lens is The order is positive and negative. In an embodiment of the invention, the aspherical lens is a seventh lens, and the seventh lens is a lenticular lens, and the eighth lens is a convex-concave lens having a convex surface facing the object side. In an embodiment of the present invention, when the magnification of the zoom lens is switched to the wide-angle end, the field of view (FOV) of the zoom lens is 0, and the distance between the first lens group and the third lens group is D. And 0/D g is. In an embodiment of the present invention, the fourth lens group is a ninth lens, a tenth lens and a first one sequentially arranged from the object 9 200823487 ^ a , , 22080 twf. doc / n side to the image side. The eleventh lens is composed of. The diopter of the ninth lens, the tenth lens, and the eleventh lens are positive, positive, and negative in sequence. In an embodiment of the invention, the lenticular lens is a ninth lens, and the third composite lens is composed of a tenth lens and an eleventh lens, and the tenth lens is a lenticular lens, and the eleventh lens is A convex lens having a convex surface toward the image side. In an embodiment of the invention, the zoom lens further includes an aperture stop between the second lens group and the third lens group and adjacent to the third lens group. "Based on the above, the present invention eliminates aberrations and chromatic aberrations by a combination of positive, negative, positive, and positive diopter of the first lens group to the fourth lens group, and is coupled with a molded aspheric surface. The lens achieves the effect of shaping and high material. In addition, the fourth lens group has the effect of zooming and compensating, and the fourth lens group can be used as the focusing group to effectively reduce the volume of the zoom lens of the present invention. The above and other objects, features, and advantages of the invention will be apparent from the embodiments of the appended claims appended claims < The drawings illustrate the specific embodiments that can be implemented by this month. The directions used in the present invention are t: upper, lower, front, back, left, and right. , just refer to the direction of the additional schema. Therefore, the directional term used is ^2080 twf.doc/n 200823487 for illustration, and not for limiting the invention. 3A to FIG. 3C are schematic diagrams showing the structure of a zoom lens according to an embodiment of the present invention at different zoom magnifications, wherein FIG. 3A shows the structure of the zoom lens at the wide-end end, and FIG. 3B shows the zoom lens in the middle. The structure of the middle position, and FIG. 3C shows the structure of the zoom lens at the tele-end. Referring to FIG. 3A to FIG. 3C, the zoom lens 300 of the present embodiment is adapted to image a scene on an object side to an image side, wherein the image side can be configured with, for example, a charge coupled device, a complementary metal-oxide semiconductor (Complementary Metal-Oxide). A photosensitive element 10 such as a semiconductor, a CMOS, or a negative film is used to capture an image imaged to the image side. The zoom lens 300 includes a first lens group 31A, a second lens group 320, a third lens group 33A, and a fourth lens group 340 which are sequentially arranged from the object side to the image side. The diopter of the first lens group 31A, the second lens group 32A, the third lens group 330, and the fourth lens group 34A are positive, negative, positive, and positive, respectively. Among them, the second lens group 320 is adapted to move between the first lens group 3iq and the third lens group 330. The fourth lens group 34 is adapted to move between the third lens group = 〇 and the image side. Further, the first lens group 31A includes at least one first compound lens 312. The second lens group 32A includes at least one 324, and one of the central aspherical lenses 324b has a concave surface S9.

The joint surface S9 faces the object side. $ U 320 = The diopter of the four lens groups 310, 320, 330, 340 of the zoom lens 300 of the present embodiment is the same as the positive, negative, and thus the aberrations. ^^的镜200823487 r 1 / / / ^2080twf.doc/n The magnification of the head 3〇0 is gradually increased from the wide-angle end (as shown in Figure 3C), the second lens group is toward the third The lens group 330 moves in the t direction and the fourth lens group 340 moves toward the third lens group 33 = = after moving and then in the reverse direction _ direction. In other words, the zoom lens is only required to move the second lens group and the fourth lens to have the effect of zooming. Therefore, the mechanism design only needs to simultaneously connect the second through group 320 and the fourth lens group 340, so that the mechanism is relatively simple = the advantage of being small in size and low in cost.

The zoom lens 300 of the present embodiment adopts a rear group focus design. When the distance between the object to be photographed and the zoom lens 300 is changed, the zoom 3〇〇 can be held by the movement of the fourth lens group 340 to maintain different imaging positions, that is, the fourth lens group 34〇 has focus. Features. In addition, the fourth lens group 340 also has an imaging compensation function to reduce the degree of aberration and imaging surface shift. Furthermore, the rear group focus design also helps to reduce the space occupied by the lens groups 310 to 340 as a whole, and the volume of the zoom lens 3 缩小 is reduced. In the present embodiment, the third lens group 330 includes at least one aspherical lens 332, and the fourth lens group 340 includes a lenticular lens 342 and a third compound lens 344 which are sequentially arranged at least from the object side to the image side. By the combination of the aspherical lens 324b and the aspherical lens 332, the zoom lens 300 can realize high-magnification zooming. The composition of each lens group of the zoom lens 300 will be exemplified below, but it is not intended to limit the present invention. In this embodiment, the first lens group 310 may be sequentially arranged from the object side to the image side by a first lens 312a, a second lens 312b and a third through 12 200823487 r 1 / / / 厶 2080twf.doc / The n-mirror 314 is composed, and the diopter of the first lens 312a, the second lens 31A, and the third lens 314 may be negative, positive, and positive. The second composite lens 312 is composed of a first lens 312a and a second lens 312b, and the first lens 312a and the third lens 314 may be a convex-concave lens with a convex surface facing the object side, and the second lens 312b may be It is a convex lens with a convex surface facing the object side. The second lens group 320 may be composed of a fourth through hole 322, a fifth lens 324a and a sixth lens 324b, which are sequentially arranged from the object side to the image side, and the fourth lens 322, the fifth lens 324a and the sixth lens. The diopter of the lens 324b can be negative, positive, and negative in sequence. The second composite lens 324 is composed of a fifth lens 324a and a sixth lens 324b, and the aspheric lens 324b is a sixth lens 324b. Further, the fourth lens 322 may be a convex-concave lens having a convex surface facing the object side, the fifth lens 324a may be a lenticular lens, and the sixth lens 324b may be a double concave lens. The second lens group 330 can be composed of a seventh lens 332 and an eighth lens 334 which are sequentially arranged from the object side to the image side, and the refracting power of the seventh lens 332 and the eighth lens 334 can be positive and negative sequentially. . The aspherical lens 332 is the seventh lens 332. In addition, the seventh lens 332 may be a lenticular lens, and the eighth lens 334 may be a convex-concave lens having a convex surface facing the object side. The fourth lens group 340 may be composed of a ninth lens 342, a tenth lens 344a and an eleventh lens 344b which are sequentially arranged from the object side to the image side, and the ninth lens 342, the tenth lens 344a and the tenth The diopter of a lens 344b can be positive, positive, and negative in sequence. The lenticular lens 342 is ninth lens 342, and the third composite lens 344 is composed of the tenth lens 344a and the eleventh lens 344b. Further, the tenth lens M4a may be a lenticular lens, and the eleventh lens 344b may be a meniscus lens having a convex surface toward the image side. In order to provide the zoom lens 300 with better image quality, higher magnification, and smaller volume, its parameters can be designed to meet all or part of the following conditions. These conditions are: . (1) L / X $ 2.5 ; • (2) Vd2 &lt;60; (3) I Vd5 - Vd6 丨 $ 16 ; (4) 0/D 2 1·9. Wherein, L is the distance from the first lens 312a to the image side (ie, the distance from the first lens 312a to the photosensitive element 1〇); and is also the zoom ratio of the zoom lens 3〇〇 (ie, the maximum magnification of the zoom lens 300 divided by the minimum The ratio of the magnification ratio); Vds and Vd6 are the dispersion values of the second lens 312b, the fifth lens 324a, and the sixth lens 324b, respectively; and 0 is the zoom lens when the magnification of the zoom lens 3〇〇 is switched to the wide-angle 10 end. The viewing angle is D; and D is the distance between the first lens group 31〇 and the third lens group 330. In order to make the zoom lens 300 have better optical quality, the zoom lens 3〇〇 may further include an aperture stop 35〇 located between the second lens group 盥 the third lens group 330 and close to the third lens group 3〇〇. More specifically, the hole is arranged in the light barrier 350 between the sixth lens and the seventh lens 332 (for example, between the surface S10 and the surface φ S13), and the sixth lens 324b is near the surface Φ S10 of the image or The seventh lens 332 is disposed on a surface S13 厶 2080 twf.doc/n 200823487 JL X / / / on the object side to control the amount of incident light. In this embodiment, the aperture stop 350 is disposed on the sixth lens 324b and the seventh lens 332. Between and close to the seventh lens 332. In addition, the zoom lens may further include a low pass filter (360), which may be disposed between the fourth lens group 340 and the image side. The following table will list the preferred parameter values in the zoom lens 300. However, the data sheets listed below are not intended to limit the present invention, and any person skilled in the art can refer to the present invention after having parameters or settings thereof. Appropriate changes, but they should still fall within the scope of the present invention.

15 200823487 π / / / 22080twf.doc/n S13 10.68200 2.530000 -----r 1-583130 --- Λ Seventh lens S14 -115.55500 0.100000 ) 乂 4 515 516 15.49700 -------- 9.70000 1.000000 -------- Variable distance 1.761821 26.5 -------- ι八透镜_ S17 23.60300 1.950000 ^---^ 1-487490 70.2 S18 -38.81500 0.100000 S19 31.18500 2.720000 —~^ i^ 8749〇^ 2〇2 Tenth lens S20 1.000000 w · ^ Ό V/V/ 1-846660 23.8 S21 -13.68200 Variable distance Λτ: ire i 1.500000 —- oZZ Infinity 1-51633 ---- 64.2 --- S23 Infinitely large 3.000000 /BL Jr\ S24 Infinitely large 〇.〇〇〇〇〇〇g Photosensitive elements In Table 1, the radius of curvature (mm) refers to each diameter, and the spacing (four) refers to the difference between two adjacent surfaces === money The distance, the refractive index and the dispersion value corresponding to the distance between the surface Si and the surface S2 are the values corresponding to the pitch, refractive index and dispersion value in the column j. Surface S1 ^ A lens 312a is remote from the surface of the second lens 312b. The surface S2 is a surface on which the first lens 312a is connected to the second lens 312b. The surface is the second lens 312b away from the surface of the first lens 312a. The surface S4, the two surfaces of the two lens 314. The surfaces S6, S7 are the surfaces of the fourth lens 322^. The surface S8 is a surface on which the fifth lens 324a is away from the sixth lens 32. The surface S9 is a table in which the fifth lens 324a is connected to the sixth lens 324b. 16 200823487

Fi / / / 22080twf.doc / n face, and surface S9 is a concave surface facing the object side of the adhesive surface. The sixth lens 324b is away from the surface of the fifth lens 324a. The surface si 丨, s = is the two surfaces of the aperture stop 350. The surfaces S13 and S14 are the two surfaces of the seventh lens Μ]. The surfaces S15, S16 are seen on both surfaces of the eighth lens 334. The faces S17 and S18 are the two surfaces of the ninth lens 342. The surface si9 is the surface of the lens 344a away from the eleventh lens 344b. The surface s2 is the surface of the lens 344a connected to the eleventh lens 344b. The surface S21 is a surface of the eleventh lens 344b away from the tenth lens 344a. Surface illusion 2, "S23 is the two surfaces of the low-pass filter 360. The surface S24 is one of the active surfaces of the photosensitive element 1 。. For the parameter values of the radius of curvature, spacing, etc. of each surface, please refer to Table 1, here is not The above surface ^10, S14 are aspherical, and the non-spherical formula is as follows: z = T7Vi - + 々, 々 ' · where Ζ is the offset of the optical axis direction, c is the close spherical surface (〇 The reciprocal of the radius of the sculating sphere, that is, the reciprocal of the radius of curvature near the optical axis (such as the radius of curvature of S1〇, S14 in Table 1). k is the conic constant. !· is the aspherical degree, ie From the center of the lens to the edge of the lens, it can be known from the formula that different r will correspond to different z values. Into the wide eight, eight, eight, eight, eight, and wide ^... is the aspheric coefficient (four) rush (4) to (10) The coefficient A! is 0. The parameters listed in Table 1 are the surface si〇 and the surface § 14. Aspheric parameters Conic constant k Coefficient a2 Coefficient a3 Coefficient a4 Coefficient a5 S10 k-0 -0.372476^ - 0.613634 0.122772 -0.159162 _ Table 2 17 200823487 π / / / z2080twf.doc/n E-03 E-05 E-06 E-07 S14 k=0 0.154522 E - 03 0.282349 E-06 -0.246983 E-07 0.442174 E-09 Table 3 Wide-angle end intermediate position telephoto effective focal length (EFL) (mm) 3.5 28.2 119 Field of view (FOV) (deg·) 70 10 2 f Value (f-number) L65 2.19 4.25 Variable distance (mm) S5 1.342 20.443 26.235 S10 25.893 6.792 1.0000 S16 8.502 3.125 15.145 S21 7.693 13.070 L050 In Table 3, the zoom lens is listed separately. Some important parameter values at the wide-angle end, the middle position and the telephoto end, including the Effective Focal Length (EFL), the field of view, the value of €, and the variable distance of the surfaces 85, S10, S16, and S21. After dividing the effective focal length 119 mm at the telephoto end listed in Table 3 by the effective focal length of 3.5 mm at the wide-angle end, the zoom ratio of the zoom lens 300 can be as high as 34 times, which is larger than that of the prior art. Only 20 times, it can be verified that the zoom lens 300 can realize high-magnification zooming. FIGS. 4A to 4C are imaging optical simulation data diagrams corresponding to the zoom lenses of FIGS. 3A to 3C, respectively. Please refer to FIG. 4A to FIG. 4C, wherein each picture is longitudinally spherically shifted from left to right (Longitudinal Spherical 18 200823487 π / / / z2080twf.doc/n

Aberration), Distortion, Astigmatism Field

Curves) and the pattern of the lateral color difference (Later Color). Since the magnification of the zoom lens 300 of the present invention at the wide-angle end, the intermediate position, and the telephoto end, the longitudinal spherical aberration, the distortion, the astigmatic field curvature, and the lateral chromatic aberration are all within the standard range, the zoom lens 300 of the present invention has a good Optical quality. In summary, the diopter of the four lens groups of the zoom lens of the present invention uses a combination of positive, negative, positive, and positive to effectively reduce the degree of aberration and chromatic aberration, and is matched with an aspherical composite lens to make the present invention The zoom lens has a high magnification and high resolution image f. In addition, due to the invention, the lens only needs to move the second lens group and the fourth lens group in the scale change, so that the second lens group has a relatively small structure, and the mechanism has low cost and is less occupied. advantage. Furthermore, the 隹μ meter also helps to reduce the space occupied by the lens group as a whole, and makes the variable = the other fourth lens group has an imaging compensation function to reduce the degree of aberration and imaging surface shift. - Although the invention has been disclosed in the above preferred embodiments, the invention is not limited to the essence of the invention; in the dry circumference, it can be modified and retouched: Subject to the == Ϊ目二j range does not need to reach the full aid patent file search of the invention, and _= ϋ 疋 疋 辅 辅 辅 图 图 图 图 。 。 。 。 。 。 。 。 。 FIG. 1 is a schematic structural view of a conventional zoom lens. 19 200823487 a a / / / 22080twf.d〇c/n FIG. 2 is a schematic structural view of another conventional zoom lens. 3A to 3C are schematic views showing the structure of a zoom lens according to an embodiment of the present invention at different zoom magnifications. 4A to 4C are diagrams of imaging optical simulation data corresponding to the zoom lenses of Figs. 3A to 3C, respectively. [Description of Main Component Symbols] 10 : Photosensitive elements 100, 200, 300: zoom lenses '110, 120, 130, 140, 210, 220, 230, 240 · · lens groups 112, 122, 132, 142, 212, 222, 232 to 242: lens 310: first lens group 312: first composite lens 312a: first lens 312b: second lens 314: third lens 320: second lens group _322: fourth lens 324: second composite lens 324a: fifth lens 324b: aspherical lens (sixth lens) 330 · third lens group 332: aspherical lens (seventh lens) 334: eighth lens 340: fourth lens group 20^2080twf.doc/n 200823487 342: lenticular lens (ninth lens) 344: third compound lens 344a: tenth lens 344b: eleventh lens 350: aperture stop 360 • low-pass filter S1 to S24: surface S9: adhesive surface

twenty one

Claims (1)

T.208〇twf.doc/n 200823487 X. Patent application scope: L A zoom lens comprising: , 丨, two brother mirror group 'having positive refracting power, the first lens group including at least one brother-one lens; A The first lens group 'has a negative refracting power' and is located between the first lens group and the second lens group, and the second lens group includes at least a second composite lens, and the second composite lens includes at least an aspherical lens, wherein the aspheric surface The lens: the adhesive surface is a concave surface, and the adhesive surface faces an object side; the second lens group 'has positive refractive power and is located between the second lens group=image side'. The third lens group includes at least a surface lens Ϊ ^ The second lens group is adapted to move between the first lens group and the third lens group, the fourth lens group, has a positive refracting power, and is located between the third through, the image side, the fourth lens The lenticular lens and the third composite lens are arranged at least from the object side to the image side = and the fourth shape is adapted to move between the third lens group and the image side.蛘2· As for the variable head according to item i of the patent application scope, one of the mirror groups is arranged in order from the object side to the image side - the first shift = a second lens and a third lens The diopter of the first lens, the read lens, and the third lens are negative, positive, and positive. The zoom lens of claim 2, wherein the distance from a lens to the image side is L, and the zoom lens is x, and L/X $2.5. 4. For example, the zoom lens described in claim 2, wherein reading 22 2〇〇823487motwfM A lens has a dispersion value less than 6〇. 5. If the second paragraph of the patent application scope: the composite lens to the first lens and the third and the mirror are both convex faces facing the object side: ° Haidi lens is convex to the object side - convex flat Through. a lens according to claim 2, wherein the second mirror is composed of a second mirror from the object side to the image side; The diopter of the lens is negative, positive, and negative in order. ^ 1 in the 3 St range Scope Item 6 of the zoom lens, swollen == (four) fifth money _ domain mirror composition, ^ lens is the sixth lens ' and the fourth lens is convex orientation The convex lens is a lenticular lens, and the sixth telescope is a double concave lens. 8. The zoom lens according to claim 6, wherein the fifth lens has a dispersion value of Vd5, and the sixth lens has a dispersion value of ^, and 丨 Vd5 - Vd6| $16. The zoom lens of claim 1, wherein the first group of mirrors is composed of a seventh lens and an eighth lens arranged in sequence from the object side to the image side. And the diopter of the seventh lens and the eighth lens are positive and negative in sequence. The zoom lens according to claim 9, wherein the aspherical lens is the seventh lens, and the seventh lens is a lenticular lens, and the eighth lens is a convex surface facing the object side. Convex and concave lens. The zoom lens according to the invention of claim 1, wherein when the magnification of the zoom lens is switched to a wide-angle end, the zoom lens has a viewing angle of Θ ' and the first lens group The distance from the third lens group is 〇, and 0/D - L9 〇 The zoom lens of claim i, wherein the fourth lens group is a ninth lens, a tenth lens and an eleventh lens sequentially arranged from the object side to the image side. The composition is characterized in that the refracting power of the ninth lens, the tenth lens and the eleventh lens are positive, positive and negative. The zoom lens of claim 12, wherein the ninth lens is composed of the ninth lens, and the tenth lens is composed of a lenticular lens, and the tenth lens is a lenticular lens; It is a meniscus lens with a convex surface facing the image side. Kong applied for the patent lens described in Item 81 of the Model 81, and included - near the third Weiqun. Between the scales and the sin twenty four