TW201011337A - Wide-angle lens - Google Patents

Abstract

This invention provides a wide-angle lens, comprising, in a sequence from the object side to the image side, a first lens set having a positive diopter and composed of a plurality of glasses that contain at least a plastic asphere lens and a glass lens; a diaphragm; and a second lens set have a positive diopter and composed of a plurality of glasses that contain at least a plastic asphere lens and a glass lens. Because the wide-angle lens of this invention uses the structure of the first positive lens set and the second positive lens set, and both the first positive lens set and the second positive lens set have a combination of asphere plastic lens and glasses lens, the image resolving performance can be improved, and color difference of the wide-angle lens of this invention can be corrected.

Description

201011337 发明, invention description: [Technical Field] The present invention relates to a wide-angle lens, and more particularly to a wide-angle high-resolution photographic lens suitable for use in a digital image product. [Prior Art]

According to the lens used in digital imaging products (such as cameras, digital cameras, etc.), it can be divided into standard humiliation, short-focus (wide-angle) lens and telephoto (telephoto) lens according to its focal length or monument angle. Generally, a wide-angle lens refers to a short focal length lens. Generally, the longer the focal length, the smaller the angle of view. The smaller the shooting range is; the shorter the focal length, the larger the angle of view and the larger the shooting range. Use the wide-angle lens to expand the field of view and take panoramic or large-scale photos within a limited distance. For example, the wide-angle lens used in video cameras is also designed to allow all users of the network video to be taken into the network video, thereby enabling the network video communicator to achieve true communication. The optical lens used to make the lens in the early days used a spherical design, but the spherical surface is not the most suitable lens shape for optical imaging. It produces many aberrations, resulting in blurred image out of focus. In order to overcome the above aberrations, the lens designer must use a lot of lenses in the lens to compensate, resulting in an increase in imaging quality, and the lens becomes large and heavy. The non-spherical mirror can greatly improve the imaging quality when the camera uses a large aperture, reduce the barrel deformation of the wide-angle lens, and an aspheric lens can replace several spherical lenses to compensate for the aberration, which can significantly simplify the optical design of the lens. Small in its size and weight. Therefore, the design of the aspherical mirror in the lens t has been very large. Whether it is a spherical mirror or an aspherical mirror, its materials are mainly glass and plastic. In the 201011337 system design concept, if the lens used as the image is made of glass material, the glass lens has a large light transmission coefficient, and the imaging effect is good, but the compensation is higher, so it is mainly used in high-order products; Because the plastic lens has a small light transmission coefficient and low price, it is mainly used in low-order products. However, because the plastic material is light and the glass material is relatively heavy, the lens is designed with a combination of a plastic lens and a glass lens to shorten the length of the lens to design the desired lens.

Please refer to a lens disclosed in U.S. Patent No. 6,441,971, which comprises a first lens, a second lens and a third lens from the object side to the image side, the first lens adopting a spherical glass lens. The second and third lenses are made of plastic aspherical lenses. Although the conventional lens uses a combination of a spherical lens and an aspheric lens, and a combination of a glass lens and a plastic lens, the conventional lens is only suitable for 640*480 pixels. (〇.3M) The following image sensors are not able to meet the high pixel requirements. Therefore, it is necessary to provide a wide-angle lens with high pixel, wide viewing angle and high image quality. SUMMARY OF THE INVENTION A main object of the present invention is to provide a wide-angle lens which has the characteristics of high pixel and wide viewing angle, and has good image quality. According to the above object of the present invention, the present invention provides a wide-angle lens, which includes, in order from the object side to the image side, a first lens group having a positive refracting power, which is composed of a plurality of lenses, and includes at least a plastic aspherical lens and - a glass lens; - an aperture; - a second lens group having positive refractive power, consisting of a plurality of mirrors <{, and comprising at least a plastic aspherical lens and a glass lens. According to the first embodiment of the present invention, the first lens group includes, in order from the object side, a first negative lens, which is a convex-concave negative lens, the convex surface faces the object side, and the concave surface faces the image side; The lens is a convex-concave negative lens having a convex surface facing the object side and a concave surface facing the image side; and a third positive lens which is a double convex positive lens. The first negative lens of the first lens group is a plastic lens, and both surfaces of the first negative lens are aspherical: the second negative lens is a plastic lens, and both surfaces of the second negative lens are The third positive lens is a glass lens according to the first embodiment of the present invention. The second lens group includes, in order from the object side, a fourth positive lens, which is a double convex positive lens; a fifth negative lens which is a double concave negative lens; and a sixth positive lens which is a double convex positive lens. The fourth positive lens of the second lens group is a plastic lens ′ and both surfaces of the fourth positive lens are aspherical; the fifth negative lens and the sixth positive lens are both glass lenses. According to the first embodiment of the present invention, the wide-angle lens satisfies the following conditional formula: 〇.5<(2Gf/lGf)<1.0^ where lGf is the focal length of the first lens group located before the aperture, and 2Gf is the second position after the aperture The focal length of the lens group. According to a second embodiment of the present invention, the first lens group includes, in order from the object side, a first positive lens which is a double convex positive lens, and a second negative lens which is a double concave negative lens. . The first positive lens of the first lens group is a glass lens; the second negative lens is a plastic lens and the surface of the second negative lens facing the image side is aspherical; the first positive lens of the first lens group The second negative lens is bonded to the lens. According to a second embodiment of the present invention, the second lens group includes, in order from the object side, a 201011337 second positive lens, a fourth positive lens, which is a double convex positive lens, and a fifth negative lens. It is a convex-concave negative lens in which the convex surface faces the object side and the concave surface faces the image side. The third positive lens of the second lens group is a plastic lens, and both surfaces of the third positive lens are aspherical; the fourth positive lens and the fifth negative lens are both glass lenses. According to the second embodiment of the present invention, the wide-angle lens satisfies the following conditional expression: -1 <(2Gf/ lGf)<(1) where 1Gf is the focal length of the first lens group located before the aperture, and 2Gf is the second lens located behind the aperture The focal length of the group. Compared with the prior art of the present invention, the wide-angle lens of the present invention adopts a structural arrangement of a first positive lens group and a second positive lens group, and an aspherical surface is used in both the first positive lens group and the second positive lens group. The combination of the plastic lens and the glass lens can reduce the cost, improve the resolution, and correct the chromatic aberration of the wide-angle lens of the present invention. [Embodiment]

Referring to the first figure, a first embodiment of the wide-angle lens of the present invention is shown with reference numeral 1. The wide-angle lens 1 of the present invention has an optical axis 1〇〇 and is along the optical axis 100 from the object side (one side indicated by the symbol OBJ in the figure) to the image side (one side marked by the IMG in the circle). The sequence includes: a first lens group G having a positive refracting power consisting of a plurality of lenses, and comprising at least one plastic aspherical lens and a glass lens; an aperture S; a second lens group G2 having positive refracting power , consisting of a plurality of lenses, and comprising at least one plastic aspherical lens and a glass lens; a glass plate GP; and an image plane IP. The wide-angle lens 1 of the present invention has a uniform tolerance sensitivity distribution, can improve the production yield ratio, and adopts a combination of a plurality of plastic aspherical lenses and glass lenses, and 201011337 can reduce the production cost and improve the image quality.

Referring to the first embodiment of the wide-angle lens 1 of the present invention shown in the first figure, the first lens group G1 of the wide-angle lens 1 includes, in order from the object side along the optical axis 100, a first negative lens 11 which is a convex-concave negative lens having a convex surface (surface 101) facing the object side and a concave surface (surface 102) facing the image side. The first negative lens U is a plastic lens and both surfaces HH and 102 of the first negative lens u are aspherical. To improve the resolution performance; a second negative lens 12, which is also a convex-concave negative lens, the convex surface (surface 1〇3) faces the object side, the concave surface (surface 〇4) faces the image side, and the second negative lens 12 a plastic lens, and both surfaces 103, 104 of the second negative lens 12 are aspherical to improve the resolution; and a third positive lens 13 is a double convex lens having a convex surface 1〇5, 106, the third positive lens 13 is a glass lens. The first lens group G1 can correct the color difference β of the wide-angle lens 1 of the present invention by the mutual matching of the first negative lens 11, the second negative lens 12 and the third positive lens 13. The second lens group G2 of the wide-angle lens 1 A fourth positive lens 14 is included in the optical axis 100 from the object side, which is a double convex positive lens having two convex surfaces 1〇8 and 1〇9, and the fourth positive lens 14 is a a plastic lens, and both surfaces ι 8 and 1 〇 9 of the fourth positive lens 14 are aspherical to improve resolution; a fifth negative lens 15 is also a double concave negative lens having two inner The concave surface 110, m, the fifth negative lens 15 is a glass lens; and a sixth positive lens 16, which is a double convex positive lens, has two convex surfaces 112, 113, and the sixth positive lens 16 is a Glass lenses. The second lens group G2 can correct the aberration of the wide-angle lens 1 of the present invention by the combination of the fifth negative lens 15 and the sixth positive lens 16. Alternatively, the glass plate GP can be a member that provides suitable functionality, such as 201011337 optical properties on its surfaces 114, 115, or can be coated with a suitable optical coating to provide any desired imaginable optical coating. Appropriate function or construction. The wide-angle lens 1 of the first embodiment satisfies the following conditional formula: 〇.5<(2Gf/lGf)<1.0 where lGf is the front group lens before the aperture S (the focal length of the technique ("the lens group G1", 2Gf The focal length of the rear group mirror # (ie, the second lens group G2) after the aperture s.

The first lens group of the first embodiment satisfies the following conditional formula: 〇 <(Ll.L2f/L3f)<-l wherein Ll.L2f is a combination of the first negative lens η and the flute_Xingdi negative lens 12 The focal length, L3f, is the focal length of the third positive lens 13. The second lens group G2 of the first embodiment satisfies the following conditional expression: - 〇.5 < (L5 £ TL6f) < - 1.5 where L5f is the focal length of the fifth negative lens 15, and L6f is the focal length of the sixth positive lens i6. According to the conditions of the above-described first embodiment, the first-valued embodiment of the wide-angle lens i of the present invention will be described in detail below. In the numerical examples shown in Tables - and Table 2, all the moment values (curvature radius and thickness) in millimeters, "type," and "curvature radius" are two columns. The lens surface _ (ie whether it is "aspherical" or "standard" type surface) and the radius of curvature; "thickness" - column refers to the thickness of the lens measured along the optical axis, or refers to the adjacent lens edge The distance of the optical axis, that is, the image side surface (surface 1〇2) of the previous lens (for example, the first lens 11) and the image side surface (surface 1〇3) of the latter lens (for example, the second lens 12) For the sake of simplifying the table, in Table 1, both (ie thickness and distance) are referred to as “thickness” 201011337, but as can be understood, this is only for simplification. The purpose is not to impose any additional restrictions or misunderstandings on the present invention. The diameter column refers to __ Table 1 _ face number radius of curvature (mm) thickness (mm) aspherical taper constant k 101 祚 spherical surface 15.15 1.22 0.2323966 102 4.86 2.32 -0.07926346 103 #球面14.2 1.1 -0.8248154 104 #球面5.1 6.68 -0.6235449 105 18.78 5.15682 0 106 -16 2.56 0 Fine standard infinity 2.2 0 108 Aspherical 20.34727 2.6 33.22012 109 Aspherical -13.71884 0.46 -8.365358 110 Standard-28.32 1.2 0 111 Standard 7.57 0.2 0 112 Standard 8.7 2.55 0 113 Standard-11.5 6.8 ~~ 0 114 楳Quasi infinity 1. 0 115 h Standard infinity 2.022762 0 Image plane standard infinity 0 Table 2 2Gf / lGf 0.768 (Ll.L2f)/L3f -0.567 ~—L5f/L6f -0.962 Wide angle sharp Head length (LensTOTR) 38.069rmn F/# 3.24 'Focus length 5.9mm Max. image height -- 4.7mm _ ----- In the first embodiment, the first negative lens 11. The second negative lens 12 and the fourth positive lens 14 are designed to have aspheric surfaces on both sides, and the aspheric design formula is expressed as follows:

2 = ^T^l)c2h2|/2 + Ah4 + Bh6 + Ch8 + Dh10 + Eh«2 + Fhl4 + 〇h.6 201011337 where Z is the reference point at the height of h along the optical axis with the surface apex The displacement value of the optical axis 'k is a cone constant (conic Constant), c=l/r, r is the radius of curvature, h is the height of the lens, A is the fourth aspherical coefficient (4th Order Aspherical Coefficient), and B is six. Secondary aspheric coefficient, C represents eight aspheric coefficients, D represents ten aspheric coefficients, E represents twelve aspheric coefficients, F represents fourteen aspheric coefficients, and G represents sixteen times. Aspheric coefficient. In the first embodiment, the specific value of the aspherical coefficient is: face number 101 (the object side of the first negative lens 11): A = 1.9586218e - 005 D = 3.7328147e - 012 G = 2.4518854e - 015 B =2.8580233e-007 E=-4.035317e-012 C=4.3318759e-009 F=-1.7544749e-013 Face number 102 (image side of the first negative lens 11): C=-1.9202712e-006 F=- 7.7517502e-012 C=6.5555741e-009 G=6.3493742e-013 A=-0.0004642398 B=3.0722763e-005 D=-l.947953 le-008 E=4.1895824e-009 G=-5.8280555e-012 Face number 103 (object side of the second negative lens 12): A=-5.072097e-005 B=-2.0354001e-006 D=〇E=0 F=-1.3084063e-011 face number 104 (second negative lens 12 Image side): A=0.00043984634 B=-4.395841e-005 C=4.0008078e-006 D=-3.0220153e-007 E=0 F=1.1029854e-009G=-3.736961 e-011 No. 108 (fourth positive The object side of the lens 14): A=-〇.〇〇〇69739518 B=2.0395649e-005 C=-6.9188195e-006 D=-8.4980764e-006 E=2.276427e-006 F=9.6542759e-008 G =-5.440888e-008 12 201011337 Face number 109 (image side of the fourth positive lens 14): A=5.5964979e-005 B=-0.00014688023 C=6.3622547e-005 D =-1.5405187e-005 E=1.4492628e-006 F=3.7154102e-008 G=-1.0705355e-008

According to the first embodiment and the first numerical embodiment thereof, the wide-angle lens 1 of the present invention can realize a wide viewing angle and a high pixel requirement. For example, if the focal length is 28 mm, the viewing angle can reach 76 degrees, and the pixel can be achieved. 3264x2448 pixels (8M), even 3648x2736 pixels (10M). The optical performance curves of the wide-angle lens 1 of the first embodiment of the present invention are respectively shown in the second A to the second E, which are the image field f (second A picture), the distortion aberration (second B picture), The curve of the comet aberration (second C picture), longitudinal aberration (second D picture), and defocus amount (second e picture). A second embodiment of the wide-angle lens of the present invention is shown in the third figure and is designated by reference numeral 2 in the circle. The wide-angle lens 2 of this second embodiment has an optical axis 2〇〇, and includes a first lens group G1' having a positive refractive power, an aperture S, and a sequence along the optical axis 200 from the object side to the image side. A second lens group G2' having positive refracting power. The first lens group G1 ′ of the wide-angle lens 2 includes, along the optical side 200 from the object side (one side indicated by the symbol OBJ in the figure), a first positive lens 21 which is a double convex positive lens having two The convex surface 201, 202 'the first positive lens 21 is a glass lens; and the second negative lens 22 is a double concave negative lens, the second negative lens 22 is a plastic lens, and the second negative lens The surface (surface 203) of the facing side of the image side 22 (one side indicated by the label IMG in the figure) is aspherical to improve the resolution performance. The first positive lens 21 and the 13th 201011337 two negative lens 22 of the first lens group G1 ′ are bonded lenses, and the wide angle lens i of the present invention can be corrected by the mutual matching of the first positive lens 21 and the second negative lens 22 . Color difference. Therefore, the object side surface of the second negative lens 22 coincides with the image side surface (surface 202) of the first positive lens 21, and for the sake of simplicity, it is represented by the surface 202, in other words, the first positive lens 21 and the The two negative lenses 22 have a total of three surfaces 201, 202, 203, wherein the surface 2 〇 2 is the surface shared by the two.

The second lens group G2 ′ of the wide-angle lens 2 of the first embodiment includes, in order from the object side along the optical axis 2 , a third positive lens 23 , which is a plastic lens, and the third positive lens The two surfaces of 23 are aspherical (labeled 2〇5, 2〇6, respectively) to improve the resolution; a fourth positive lens 24, which is a double convex positive lens with two convex surfaces 2〇7 2〇8, the fourth positive lens 24 is a-glass lens; and a fifth negative lens 25, which is a convex-concave negative lens, wherein the convex surface (surface 209) faces the object side, and the concave surface (surface 21〇) faces Like the square, the fifth negative lens 25 is a glass lens. The second lens group G2 can bridge the aberration of the wide-angle lens 2 of the present invention by matching the fourth positive lens 24 and the fifth negative lens 25. The wide-angle lens 2 of the second embodiment satisfies the following conditional expression: -1 <(2Gf / lGf)<0 where lGf* is the focal length of the front group lens (i.e., the first lens group G1,) before the aperture S, 2〇Γ The focal length of the rear group lens (ie, the second lens group G2,) after the aperture S. The first lens group G1' of the second embodiment satisfies the following conditional formula: ~1.5<(Llf/L2f)<-2.5 wherein Llf is the focal length of the first positive lens 21, and L2f is the focal length of the second negative lens 22. The second lens group G2' of the second embodiment satisfies the following conditional formula: - 〇.5 < (L4f' / L5f') <-1.5 201011337 where L4f is the focal length of the fourth positive lens 24, which is the fifth. Negative lens The focal length of 25. According to the second embodiment above, the second numerical complement of the wide-angle lens a of the present invention will be described in detail below. In Tables 3 and 4, the values of all the moment values (curved material diameter and thickness) _ silk disintegration are implemented, and the values of the columns are the same as those in Table 1 above, and will not be repeated here. Table three-surface number class ^ Curvature radius (mm, thickness (mm) Aspherical taper constant k ... 201 Standard 11.34 1.9 202 Standard - 13.26 0.56 203 Aspherical surface 3.041 3.05 0.7624955 Aperture standard infinity 0.93 205 Aspherical surface -194.811 1.88 -4820.93 206 Aspherical surface -4.308 0.05 -5.649477 207 Standard 5.93 ” 1.00 208 Standard-10.21 0.05 209 Standard 14.55 0.88 210 Standard 3.71 3.00 211 Standard Infinity 1.00 212 Standard Infinity 3.239454 Image Plane Standard Infinity Table 4 2Gf/lGf -0.494 Llf/L2f -2.076 L4f/L5f -1.005 Wide-angle lens total length (LensTOTR) 18.3mm F/# 3.2 Wide-angle sharp head focal length (Focal length) 7.197 mm Maximum image height (Max. image height) 4.6 mm In the second embodiment, the second negative lens 22, the third positive The lens 23 adopts an aspherical design 'which also satisfies the aspheric design formula mentioned in the first embodiment. In the second 15 201011337 embodiment, the value of the aspherical coefficient is: face number 203 (first The image side of the two negative lens 22): A=-0.0010004608 B= 0.00093421271 C=-0.001287934 D=0.00079975628 E= -0.00028641723 F=5.2696089e-005 G=-4.022007e-006 face number 205 (object side of the third positive lens 23): A=0.00024727441 B=-0.0038499838 C=0.0072497191 D=-0.0065204759 B=0.00S1881991 F= -0.00079611792

G=7.9703295e-005 No. 206 (image side of the third positive lens 23): A=-0.0071840982 B=0.0010948022 C=-0.00026061255 D=0.00011834055 E=-3.1322283e-005 F=4.344826e-006 G= -2.235513e-007 According to the second embodiment and its second numerical embodiment, the wide-angle lens 2 of the present invention can realize a wide viewing angle and a high pixel requirement, for example, the pixel can reach 3264x2448 pixels (8M), and even At 3648x2736 pixels (10M). The optical performance curves of the wide-angle lens 2 of the second embodiment of the present invention are shown in the fourth to fourth E, respectively, which are the field curvature (fourth a diagram) and the distortion aberration (fourth circle). The curve of the comet aberration (fourth C picture), the longitudinal aberration (fourth D circle), and the defocus amount (fourth E picture). In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art in light of the spirit of the present invention are included in the scope of the appended claims. 201011337 [Simple description of the drawings] The first figure is the positional relationship of the lenses of the wide-angle lens of the first figure of the present invention. The optical characteristics of the wide-angle lens of the first embodiment of the present invention are shown separately. (second map), distortion county (second map), comet aberration (first Cgl), longitudinal aberration (second d map), defocus amount (second map) curve.

The first circular system is a schematic diagram of the lens mismatch relationship of the lens of the present invention. The fourth to fourth E @ facets show the optical performance curves of the wide-angled outline of the second embodiment of the present invention, respectively Like Qingqu (fourth A picture), sag aberration (fourth B circle), comet aberration (fourth C picture), longitudinal aberration (fourth picture), defocus amount (fourth (four)) Curve. [Description of main component symbols] Wide-angle lens 1 First negative lens 11 Second negative lens 12 Third positive lens 13 Fourth positive lens 14 Fifth negative lens 15 Sixth positive lens 16 Wide-angle lens 2 First positive lens 21 Second negative lens 22 Third positive lens 23 fourth positive lens 24 fifth negative lens 25 first lens group G1 17 201011337

First lens group G1, second lens group G2 second lens group G2, aperture S glass plate GP image plane IP 18

Claims (1)

201011337 Picking up, applying for a patent range: 1. A wide-angle lens, which includes, in order from the object side to the image side, a first lens group having a positive refracting power, which is composed of a plurality of lenses, and includes at least one plastic aspherical lens and a glass. a lens; an aperture; a second lens group having positive refractive power, consisting of a plurality of lenses and comprising at least one plastic aspherical lens and one glass lens. 2. The wide-angle lens according to claim 1, wherein the first lens group comprises, in order from the object side, a first negative lens, which is a convex-concave negative lens, the convex surface faces the object side, and the concave surface faces the image. a second negative lens which is a convex-concave negative lens with a convex surface facing the object side, a concave surface facing the image side, and a third positive lens which is a double convex positive lens. 3. The wide-angle lens of claim 2, wherein the first negative lens of the first lens group is a plastic lens, and both surfaces of the first negative lens are aspherical; the second negative lens is a plastic lens, wherein both surfaces of the second negative lens are aspherical; the third positive lens is a glass lens. 4. The wide-angle lens as described in the patent application scope, wherein the second lens group includes, in order from the object side, a fourth positive lens which is a double convex positive lens and a fifth negative lens which is a pair a concave negative lens; and a sixth positive lens, which is a double convex positive lens. 5. The wide-angle lens of claim 4, wherein the fourth positive lens is a plastic lens, and both surfaces of the fourth positive lens are aspherical; the fifth negative lens and the sixth positive lens All are glass lenses. 6. The wide-angle lens according to claim </ RTI> wherein the first lens group comprises, in order from the object side, a: - a negative lens, which is a convex-concave negative lens, and a convex surface facing the object 201011337 concave surface Oriented toward the image side, a second negative lens, wherein the convex and concave negative lens convex surface faces the object side, the concave surface faces the image side; and a third positive lens which is a double convex positive lens, and the second transparent recording phase The Wei Wei contains a fourth positive Wei, which is a double convex positive lens, a fifth negative lens, which is a double concave negative lens, and a sixth positive lens, which is a double convex positive lens. 7. The wide-angle lens according to claim 6, which satisfies the following conditional formula: 〇.5&lt;(2Gf/lGf)&lt;l.〇 where iGf is the focal length of the first lens group, and 2Gf is the second lens group The focal length. 8. The wide-angle lens according to claim 6, which satisfies the following conditional formula: 〇 &lt;(Ll.L2f/L3i)&lt;-l wherein U, L2f are the first negative lens of the first lens group and The composite focal length of the second negative lens, L3f is the focal length of the third positive lens of the first lens group. 9. The wide-angle lens according to claim 6 of the patent application, which satisfies the following conditional formula: -〇.5&lt;(L5fil.6f)&lt;-1.5, Wherein L5f is the focal length of the fifth negative lens of the second lens group, and (6) is the focal length of the sixth positive lens 16 of the second lens. 10 · As for the wide-angle lens described in item 6 of the patent application, 〇.5&lt;(2Gf/lGf)&lt;l.〇; which satisfies the following conditional expression: -〇.5&lt;(L5f/L6f)&lt;-1.5 lGf is the focal length of the first lens group '2Gf is the focal length of the first _~the lens group, Ll.L2f is the first negative lens and the second negative 逯20 of the first lens group 201011337 第三-the third positive lens of the lens group The focal length, L5f is the focal length 'L6f of the fifth negative lens of the second lens group, which is the focal length of the sixth positive lens 16 of the second lens group. 11: The wide-angle lens according to claim 1, wherein the _ lens group comprises, in order from the object side, a: - a positive lens, which is a double convex positive lens; and - a second negative A lens, which is a pair of concave negative lenses. 12. The wide angle _ as described in the patent specification, wherein the first lens group, the positive lens is a glass lens, the second negative lens is a plastic lens, and the second negative lens The surface facing the image side is aspherical; the first positive lens and the second negative lens of the first lens group are bonded lenses. 13. If you apply for a patent scope! The wide-angle lens of the above, wherein the second lens group includes, in order from the object side, a: - a third positive lens; a fourth positive lens, which is a - double convex positive lens; and - a fifth negative lens - which is a A convex-concave negative lens in which the convex surface faces the object side and the concave surface faces the image side. Η 广 广 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如 如The fourth positive lens and the fifth negative lens are both glass lenses. The wide-angle lens as described in the above-mentioned patents, wherein the first lens group comprises, in order from the object side, a first positive lens which is a double convex positive lens and a second negative lens. a double-concave 贞 lens, and the lining H 谓 谓 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次 依次The lens 'where the convex surface faces the object side, and its concave surface faces the 21 201011337 image side. 16 · The wide-angle lens according to claim 15 of the patent application, which satisfies the following clause-1 &lt;(2Gf/lGf)&lt;〇八. Where IGf is the first lens_focal length, the view 'ride two lens _ focal length . 17 · As disclosed in the 15th article of the patent application, it is provided as follows -1.5&lt;(Lir/L2f)&lt;-2.5 Where Uf is the focal length of the first positive lens of the first lens group, and the coffee is the focal length of the second negative lens of the first lens group. 18 · For example, please refer to the wide-angle lens described in item 15, which satisfies the following conditional formula: -0.5&lt;(L4r/L5f)&lt;-1.5 where L4f* is the focal length of the fourth positive lens of the second lens group L5f is the focal length of the fifth negative lens of the second lens group. 19. The wide-angle lens of claim 15, which satisfies the following conditional expression: -1 &lt;(2Gf/lGf)&lt;0 -1.5&lt;(Llf/L2f)&lt;-2.5 -0.5&lt; ( L4f / L5f) &lt;-1.5 wherein lGf is the focal length of the first lens group, 2Gr is the focal length of the second lens group, Uf is the focal length of the first positive lens of the first lens group, and L2r is the first lens group The focal length of the second negative lens, ΜΓ is the focal length of the fourth positive lens of the second lens group, and L5f is the focal length of the fifth negative lens of the second lens group. twenty two